WO2018120987A1 - Information transmission method, terminal and network device - Google Patents

Abstract

Provided in the embodiments of the present invention are an information transmission method, a terminal and a network device, the transmission method being used for transmitting information by means of a plurality of subframes in a time division duplex (TDD) communication system, the plurality of subframes comprising a first subframe, and the first subframe comprising a first service channel and a first uplink request channel. The transmission method comprises: data is transmitted between a network device and a terminal by means of the first service channel; and the network device receives report information of the terminal by means of the first uplink request channel, the report information being at least one of a data transmission request of a second service, data of a third service and a feedback message of a preset emergency instruction, wherein the second service and the third service are preset emergency services. The method may reduce the waiting time for sending of report information, thereby reducing time delay of the report information.

Description

Information transmission method, terminal and network device Technical field

The present invention relates to the field of communications, and more particularly to a method for transmitting information, a terminal, and a network device.

Background technique

In recent years, the performance of the network delay (Delay/Latency) has been paid more and more attention, and has gradually become a new hot spot in the communication industry. Low-latency networks have also become the development direction of operators. With the in-depth development of "Internet +", the telecommunications network has begun to be deeply integrated with various industries, and some emerging industries and emerging businesses have placed near-demanding demands on network delay. For example, the development of electronic transactions, high-definition video, cloud computing and future 5G services makes time delay an important performance indicator for communication networks, and low latency will become an important means of competition for carrier network capabilities in the future.

In general, existing methods of controlling delay often break through from the perspective of a wireless access network, a core network, or an Internet PDN (Public Data Network) network. TDD (Time Vivison Duplexing) communication system is a system using TDD communication technology. At present, the information transmission mode in the TDD (Time Vivison Duplexing) communication system uses a frame structure that causes a large delay and cannot meet the requirements of services in the network.

Summary of the invention

In view of this, the embodiments of the present invention provide a method, a terminal, and a network device for information transmission, which can reduce the transmission waiting time of a part of information to a certain extent, thereby reducing the delay of the information.

In a first aspect, an embodiment of the present invention provides an information transmission method for transmitting information through multiple subframes in a time division duplex TDD communication system, where the time division duplex TDD communication system includes a network device and a terminal. The multiple subframes include a first subframe, the first subframe includes a first traffic channel and a first uplink request channel, and the transmission method includes: the network device adopting the first traffic channel and the The terminal transmits data. S503: The network device receives the report information of the terminal by using the first uplink request channel, where the report information is a data transmission request of the second service, data of the third service, and a feedback message of the preset emergency command. At least one of the second service and the third service is a preset emergency service.

In this way, the request, the data, and the feedback message of the preset emergency command are reported to the network device by using the first uplink request channel, and the service channel and the uplink request channel are provided in one subframe for emergency service and emergency. The feedback message of the instruction reserves resources, so that the reported information can be reported in a timely and flexible manner, without waiting for the data being transmitted to be transmitted, and transmitting in a suitable subframe in the transmission direction, thereby reducing the time of the part. The delay of sending higher reported information is delayed, thereby reducing the delay of this part of the information.

It should be understood that the network device may communicate with a group of terminals using a frame structure of the first subframe by using a broadcast or directional transmission, and the group of terminals may include one or more terminals, for example, the group of terminals is the network device. The terminal in a certain broadcast group served by the terminal or the terminal in the list related to a certain service, or one or more terminals in the cell served by the network device.

It should be understood that the normal data is data that can tolerate the delay generated by the frame format in the TDD protocol of the prior art. Specifically, ordinary data has low requirements on real-time performance, and also has high tolerance to interference and errors in data transmission. The urgent data is data that cannot tolerate the delay generated by the frame format in the TDD protocol of the prior art. Specifically, urgent data but by The requirement for real-time performance is high, and the terminal or the network side needs to respond quickly, so more accurate and fast transmission is required, and the tolerance to errors and errors in the data transmission process is low. The transmission by the conventional LTE protocol cannot meet these requirements. It will affect the execution of the service corresponding to the emergency data. This effect has a greater impact in the above-mentioned wide coverage or deep coverage scenarios, and is often extended by several tens of seconds. This may result in the network side not being able to control the terminal in time, such as the command cannot. The timely release or the like, therefore, the emergency data is more suitable for processing using the method in the embodiment of the present invention.

Therefore, the embodiment of the present invention provides an information transmission method for transmitting information through multiple subframes in a time division duplex TDD communication system. Among them, a new sub-frame is used, and the transmission of data is no longer considered in units of frames. There is no longer a concept of an explicit frame, and there is no clear sub-frame ratio, but a more flexible transmission of data. , reducing the waiting time of data transmission, that is, reducing the delay. The subframe is transmitted between a network side device (such as a base station, a gateway) and a terminal (such as a tablet computer, a mobile phone, an electric meter, etc.) of the time division duplex TDD communication system. For example, such a subframe may be transmitted in a broadcast form between a network side device and a plurality of terminals in a broadcast area (such as a cell) covered by the network side device.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the first subframe is a downlink subframe, and the first interval is adjacent to the first uplink request channel. The frame further includes a first interval, and the first interval is adjacent to the first uplink request channel, in which the network device stops communicating with the terminal, and the network device passes the And transmitting, by the first service channel, the data of the first service to the terminal, where the network device sends data of the first service to the terminal by using the first service channel. In this way, the first interval can prevent the data transmitted by the network device and the terminal in the first subframe from being interfered by other terminals in the cell where the network device is located.

With reference to the first aspect, or the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the first uplink request channel is a second to last of the first subframe Orthogonal frequency division multiplexing OFDM symbols.

In this way, if the terminal requests the emergency data to be reported to the network device in the first uplink request channel, the network device can notify the terminal in the next subframe of the first subframe, and the next subframe can report the data, thereby reducing the terminal. The waiting time for reporting data. That is, the first subframe and the second subframe are adjacent subframes.

On the other hand, the second possible implementation manner may further include that the downlink emergency control channel is the first OFDM symbol of the second subframe. In this way, the terminal can report the data of the second service by following the control information in the second subframe, and reduce the transmission delay of the data of the second service. With reference to the first aspect, the second possible implementation manner of the first aspect, information. In this way, it can be ensured that the reported information related to the emergency service or the emergency command can monopolize the first uplink request channel without being occupied by the ordinary data, thereby ensuring timely reporting of the reported information and reducing the delay.

With reference to the first aspect, the third possible implementation manner of the first aspect, After the first subframe, the reporting information includes a data transmission request of the second service, and the second subframe includes a second downlink emergency control channel and a second traffic channel, where the method includes The method further includes: sending, by the network device, second control information to the terminal by using the second downlink emergency control channel according to the data transmission request of the second service, where the second control information is used to indicate that the The information transmission mode between the network device and the terminal is uplink transmission, and the network device receives data of the second service sent by the terminal by using the second service channel.

In conjunction with the fourth possible implementation of the first aspect, in a fifth possible implementation manner of the first aspect, the second subframe further includes a second interval, where the second interval is located in the second service channel Between the second downlink emergency control channels, in the second interval, the network device stops communicating with the terminal. The second interval may prevent the data transmitted by the network device and the terminal in the second subframe from being interfered by other terminals in the cell where the network device is located.

With reference to any one of the fourth or fifth possible implementation manners of the first aspect, in a sixth possible implementation manner of the first aspect, the method further includes: the network device by using the second The downlink emergency control channel transmits data to the terminal.

In this way, the downlink emergency control channel can also be used to transmit data, making full use of the channel resources of the subframe, so that the time for transmitting data in one subframe is as long as possible, and the utilization of the subframe is improved. For example, in the case that the control information is small or mixed with an existing frame structure, the first subframe is configured as an uplink or a downlink subframe according to the original configuration, and the first subframe does not need to change the original configuration. The downlink emergency control channel is not wasted due to vacancy, and can be used for transmitting data, which is equivalent to maximizing the use of resources capable of transmitting data in a subframe, thereby improving the utilization rate of the subframe. In an implementation manner, each of the multiple subframes includes a downlink emergency control channel and a traffic channel. On the other hand, there may be multiple downlink emergency control channels and multiple traffic channels in one subframe. For each downlink emergency control channel, the downlink emergency control channel is on the traffic channel corresponding to the downlink emergency control channel (ie, the downlink emergency) The control channel can be used to indicate the transmission mode of its corresponding traffic channel).

With reference to any one of the first to the sixth possible implementation manners of the first aspect, in the seventh possible implementation manner of the first aspect, the multiple subframes further include a third subframe, the third The subframe includes a third downlink emergency channel, a third traffic channel, and a third uplink request channel, where the third downlink emergency channel is before the third traffic channel and the third uplink request channel, and the method includes: Transmitting, by the network device, third control information to the terminal by using the third downlink emergency control channel, where the third control information is used to indicate that, between the network device and the terminal, in the third sub-service channel The information transmission mode is: the uplink transmission or the downlink transmission; the network device communicates with the terminal by using the information transmission manner by using the third service channel; Receiving, by the third uplink request channel, the reporting information of the terminal, where the reporting information is a data transmission request of the fourth service, data of the fifth service, and a preset emergency instruction. At least one of said fourth and said fifth traffic service is a preset emergency service, the third uplink message request feed channel is only used for transmitting the reporting information.

In this way, the subframe structure of the multiple subframes is more diverse, and the uplink request channel and the downlink emergency control channel are included in one subframe, so that the control of the subframe is more effective, the data reporting is more flexible, and the waiting time for data reporting is reduced.

It should be noted that, in the third subframe, the information transmission manner may also be an uplink transmission and a downlink transmission, where the third subframe includes multiple traffic channels, where at least one traffic channel is an uplink transmission, and at least one traffic channel is a downlink. Transmission, configuration information of multiple traffic channels in the third subframe (eg, length, location, frequency, etc. of each traffic channel) can be transmitted to the terminal through the downlink emergency control channel. It should be understood that in order to ensure that data transmission is not interfered by other terminals, there may be a guard interval between traffic channels with different data transmission modes.

It should be noted that the network device may send a handover command by using a broadcast channel, where the handover command is used to enable or disable the transmission of the subframe described in the embodiment of the present invention in the network where the network device is located. Or the function of the indication instruction is implemented by a 1 bit in a System Information Block (SIB) in the broadcast channel, and the SIB may be part of the cell information transmitted by the broadcast channel.

In a second aspect, an embodiment of the present invention provides an information transmission method, where the transmission method is used to transmit information in multiple subframes in a time division duplex TDD communication system, where the time division duplex TDD communication system includes a network device and a terminal. The plurality of subframes includes a first subframe, the time division duplex TDD communication system includes a network device and a terminal, the multiple subframes include a first subframe, and the first subframe includes a first traffic channel and a first The uplink request channel, the transmission method includes: the terminal transmitting data of the first service with the network device by using the first service channel; and sending, by the terminal, the network device to the network device by using the first uplink request channel The report information is at least one of a data transmission request of the second service, data of the third service, and a feedback message of the preset emergency command, where the second service and the third service are pre- Emergency business.

The second aspect provides a method for the terminal side to perform the content described in the first aspect, and the content is related to the first aspect. Therefore, regarding various possible implementation manners, descriptions, and technical effects of the second aspect, refer to the first aspect. The description is not repeated here.

In a third aspect, an embodiment of the present invention provides a network device, where the network device is configured to transmit information in multiple subframes in a time division duplex TDD communication system, where the time division duplex TDD communication system includes a network device and the terminal. The plurality of subframes includes a first subframe, the first subframe includes a first traffic channel and a first uplink request channel, and the network device includes: a data transmission module, configured to use the first traffic channel and The terminal transmits data; the request receiving module is configured to receive the report information of the terminal by using the first uplink request channel, where the report information is a data transmission request of the second service, data of the third service, and a preset At least one of the feedback messages of the emergency command, the second service and the third service being preset emergency services.

In a fourth aspect, an embodiment of the present invention provides a network device, where the network device is configured to transmit information in multiple subframes in a time division duplex TDD communication system, where the time division duplex TDD communication system includes the network device and the terminal. The plurality of subframes include a first subframe, the multiple subframes include a first subframe, the first subframe includes a first traffic channel and a first uplink request channel, and the network device includes a processor and a transceiver. The processor is configured to perform the method of any of the first aspect or the first aspect by the transceiver.

Since the network device provided by the third aspect and the fourth aspect is the device corresponding to the method provided by the first aspect, refer to the first aspect regarding various possible implementation manners, descriptions, and technical effects of the third aspect and the fourth aspect. The description is not repeated here.

In a fifth aspect, an embodiment of the present invention provides a terminal, where the terminal is used to transmit information in multiple subframes in a time division duplex TDD communication system, where the time division duplex TDD communication system includes a network device and the terminal, where The time division duplex TDD communication system includes a network device and a terminal, the multiple subframes include a first subframe, the first subframe includes a first traffic channel and a first uplink request channel, and the terminal includes: a data transmission module And the data for transmitting the first service by using the first service channel and the network device, and the request reporting module, configured to send the report information to the network device by using the first uplink request channel, where the report information is And at least one of a data transmission request of the second service, data of the third service, and a feedback message of the preset emergency command, where the second service and the third service are preset emergency services.

In a sixth aspect, an embodiment of the present invention provides a terminal, where the terminal is configured to transmit information in multiple subframes in a time division duplex TDD communication system, where the time division duplex TDD communication system includes a network device and the terminal, where The plurality of subframes include a first subframe, where the first subframe includes a first traffic channel and a first uplink request channel, and the terminal includes a processor and a transceiver, and performs the second aspect or the second aspect. the way.

The network device provided by the fifth aspect and the sixth aspect is the device corresponding to the method provided by the second aspect. For the possible implementation manners, descriptions, and technical effects of the fifth aspect and the sixth aspect, refer to the second aspect. The description is not repeated here.

In a seventh aspect, the present invention provides a storage medium for storing a program for performing the method of the first aspect or any one of the implementations of the first aspect. Alternatively, the medium is for storing a program for performing the method of any one of the second aspect or the second aspect.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Common in the field For the skilled person, other drawings can be obtained from these drawings without any creative work.

1 is a schematic diagram of a networking of a TDD communication system to which the method according to the embodiment of the present invention is applied;

2 is a schematic diagram of a cloud communication scenario according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of multiple frame structures for a TD-LTE system according to an embodiment of the present invention; FIG.

4 is a schematic diagram of a structure of a radio frame of an IoT 230 system according to an embodiment of the present invention;

FIG. 5 is a schematic flowchart diagram of an information transmission method according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of information interference involved in transmitting information according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a control information distribution that can be used in a broadband system and a narrowband system according to an embodiment of the present invention; FIG.

FIG. 8 is a flowchart of interaction in a subframe structure of uplink emergency data transmission according to an embodiment of the present disclosure;

FIG. 9 is a flowchart of interaction in a subframe structure of downlink emergency data transmission according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of an improved structure of a frame in an IoT230 system according to an embodiment of the present invention; FIG.

FIG. 11 is a schematic diagram of another improved structure of a frame in an IoT230 system according to an embodiment of the present invention; FIG.

FIG. 12 is a schematic diagram of transmitting downlink emergency data in an IoT230 system according to an embodiment of the present invention;

FIG. 13 is a schematic diagram of transmitting uplink emergency data in an IoT230 system according to an embodiment of the present invention;

FIG. 14 is a schematic diagram of data transmission using an improved frame structure according to an embodiment of the present invention; FIG.

FIG. 15 is a schematic diagram of a network device according to an embodiment of the present disclosure;

FIG. 16 is a schematic diagram of a terminal according to an embodiment of the present disclosure;

FIG. 17 is a schematic diagram of an apparatus for performing the method according to an embodiment of the present invention.

detailed description

The embodiments of the present invention provide a method, an apparatus, and a system for information transmission. The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

First, some nouns appearing in the embodiments of the present invention are explained.

It should be understood that the first, second, and third words referred to in the implementation of the present application do not denote any order, but are used for convenience of description when describing the same type of things, for example, the first subframe. The second subframe and the third subframe are all subframes. For another example, the first traffic channel, the second traffic channel, and the third traffic channel are all traffic channels, and it is not appropriate to understand the channel of the first service, the channel of the second service, and the channel of the third service. In some cases, these words may refer to the same thing of the same type, for example, any one of the second service, the third service, the fourth service, and the fifth service may be the same service.

The TDD communication system described in the present application refers to a system that supports communication using TDD communication technology. The TDD system described in the present application includes a network device and a terminal, and means that the network device and the terminal can communicate using the information transmission method described in this application. That is to say, the inclusion is not described in the form of networking or networking, but is described from the perspective of the same communication technology supported by the network device and the terminal, namely TDD communication technology. Because the terminal is mobile, the general description mode, from the perspective of the networking form, does not explicitly classify the terminal in a certain communication system. That is to say, the network device is a network device supporting the use of the TDD communication technology, and the terminal is a terminal supporting the use of the TDD communication technology. In other words, the network device and the terminal included in the TDD system described in this application file are not required to be in a specific networking mode or networking structure, and the network device and the terminal must be in a networking architecture. As long as you support the use of TDD communication technology.

The terminal in the embodiment of the present invention may be a mobile terminal, such as a mobile, wearable, or in-vehicle mobile device such as a mobile phone, a tablet computer, a sports camera, a notebook computer, or some communication network. Computers, servers, etc., even electric meters, water meters, gas meters, etc. that can communicate using TDD technology, and other terminal devices that can communicate using TDD technology. The network device in the embodiment of the present invention may be a base station, a server proxy server, or the like, a router, a gateway, and the like that can use the TDD technology, and other network devices that can communicate using the TDD technology. The embodiments of the present invention do not limit the specific types of terminals and network devices.

The method described in the embodiments of the present invention can be applied to various communication systems using TDD technology. Of course, an FDD (Frequency Division Duplexing) system can also be used. For example, in a power communication system (the network architecture can refer to the schematic diagram 1), there is a TDD-based communication control system for monitoring and collecting the meter data, the system includes a plurality of terminals, and the terminals can be used to collect the meter. Data, receiving and forwarding control commands, etc., these terminals communicate with the core control device of the communication control system through the base station, and communication between the network devices such as the base station and the terminal in the system can use the method to support the power system Electricity collection, emergency repair, distribution automation, and information reporting of fault detection sensing equipment. For example, in these services, many key control information, such as the transmission of control signals of emergency services, need to be reliably transmitted in the fastest time. For example, new energy introduced in the power grid needs real-time detection because of the instability of output power. And control, both have high requirements for the real-time nature of information transmission.

For example, the development trend of cloud computing, big data, and Internet of Things has caused more and more businesses to run on the cloud. Clouds have become a trend that communication networks cannot avoid. As a physical carrier of the cloud, the data center gradually As the core of network traffic, data centers need to provide services for many terminals in the network. Data is migrated more frequently within data centers, between data centers, and between data centers and terminals. This type of migration can be called cloud communication. In the business, cloud communication services, some of them have higher requirements for real-time performance, such as virtual machine hot migration, cloud data hot backup, cloud disaster recovery, high-throughput collaborative computing, etc., and gradually migrate to the market as the market develops. Some application layer services on the cloud, such as cloud payment services, cloud desktop services, etc., Figure 2 includes some typical cloud communication scenarios, such as instant messaging, audio and telephone, video, emergency messaging, etc., which are directly oriented to users. The requirements for real-time performance are also high.

In a system using the TTD technique, the physical layer communicates using frames of the TTD. The frame of the TTD technique represents a fixed duration, and the duration of the frame is called the length of the frame. Generally, each frame includes a certain number of subframes, each subframe has a fixed duration, and each subframe is composed of a number of OFDM (Orthogonal Frequence-division Multiplexing) symbols, and the length of the frame is also It can be identified by the number of subframes included in the frame. Each subframe is a data transmission unit for uplink transmission (data flow to terminal to data center) data, downlink transmission (data flow to data center to terminal) data or control. Generally, the length of one frame, the number of subframes included in the subframe, and the number of subframes in the subframes responsible for uplink and downlink data transmission are all pre-configured, that is, fixed according to a certain protocol or version, for example, Figure 3 shows seven TD-LTE frame structures. The number of uplink subframes and downlink subframes is fixed in each frame structure. The switching period has two configurations of 5ms and 10ms, and the corresponding special subframes are used. The number of uplink and downlink switching is 1 and 2. The downlink sub-frame shown in Figure 3 has four configurations (configuration 2/3/4/5), and the uplink sub-frame has two configurations (configuration 0/6). The uplink and downlink equalization configuration has 1 configuration. Kind (configuration 1). Where D represents a downlink transmission unit (a downlink subframe), S represents a special subframe, and U represents an uplink transmission unit (an uplink subframe). Therefore, the data must wait until the corresponding subframe state arrives, and the delay problem is more serious. Taking the structure of the radio frame of the IoT 230 system shown in FIG. 4 as an example, a radio frame in the frame structure includes 15 subframes and has a length of 120 ms (milliseconds), wherein the uplink and downlink respectively have 7 subframes, and the length of each subframe. For 8ms, there are 10 OFDM symbols in each sub-frame. Middle one For a special subframe, the special subframe is used as the uplink transmission unit, and is the PRACH (Physical Random Access Channel) of the uplink random access procedure. The first seven subframes are downlink transmission units (Down Link, DL), the next 7 subframes are Up Link (UL). The transmission time interval (TTI) of the wireless communication system is based on a subframe. In a normal scenario, the TTI is one subframe. If you want to transmit downlink emergency data during the uplink subframe, you need to wait for the uplink. When the subframe arrives, the maximum delay of the downlink transmission is 8 subframes. Similarly, the uplink delay is up to 24 subframes, and in the scenario where wide coverage is required, the delay is longer. It should be understood that, under another system or protocol, the length of the frame, the ratio of the uplink and downlink transmission units, etc. may be different, for example, China Putian LTE230, the subframe length is 5 ms, and the number of uplink subframes and downlink subframes is matched. The ratio is 3:1 or 2:2.

It can be understood that, in the prior art, only the traffic channel is used in the uplink subframe and the downlink subframe, and the traffic channel is used to transmit data (the information and the command are also one type of data), and the transmission direction of the traffic channel is uplink transmission, The subframe is an uplink subframe, and the transmission direction of the traffic channel is downlink transmission, and the subframe is a downlink subframe.

It can be seen that, due to the fixation of the uplink and downlink subframes in the frame structure, if there is data different from the transmission direction of the current subframe in the data transmission process, for example, in the downlink subframe, the terminal has an emergency to report, or In the uplink subframe, there is an emergency command on the network side to be released, and all can only wait until the corresponding subframe can be transmitted, so the delay is long. On the other hand, the actual networking needs to consider the needs of the services supported by the network. For example, wide coverage and deep coverage are very common requirements. Wide coverage refers to the use of limited base stations to support a large number of device connections; deep coverage refers to the transmission of information in a system that covers a large number of terminals within a large building within the system, such as in the energy Internet application market, smart grid, and the like. In such a wide coverage or deep coverage system to ensure the correct transmission of the signal, it is necessary to ensure the energy of the signal source, the energy is equal to the power multiplied by the time, but the power of the signal source has a clear regulatory limit, so this type The system can only increase the time for sending data. That is to say, the data is repeatedly transmitted multiple times, that is, the TTI is lengthened, and once the data is transmitted, it cannot be interrupted. After the data is transmitted, it is necessary to wait for the subframe with the appropriate information transmission mode. The transmission of new data has a very large delay. Moreover, even in the same transmission direction, since the packet of data to be transmitted is fixed for a certain period of time, the urgent data in the same transmission direction generated during this period of time is also the packet of the data of the subframe due to the resource of the subframe. Occupied and unable to transmit, it is necessary to transmit in the appropriate subframe after the data transmission is completed. For example, the NB-IoT system belonging to the massive IoT technology in the Internet of Things application market has an uplink TTI of 40,960 ms. However, in such a wide coverage or deep coverage system, it is often necessary to transmit some small traffic but sudden strong emergency data, such as power service control commands in the smart grid distribution automation scenario or reporting faulty motors, etc. The transmission has low latency requirements and requires a high latency for communication. Therefore, in the wide coverage network or the deep coverage network, the delay problem is more obvious. Obviously, the method described in the embodiment of the present invention is applicable to such a network.

In the embodiment of the present invention, the data of the ordinary service is ordinary data. Common data is also used later in this application to represent data for ordinary services. That is to say, the normal data is data of a service that can tolerate the delay generated by the frame format in the TDD protocol of the prior art. Specifically, ordinary data has low requirements on real-time performance, and also has high tolerance to interference and errors in data transmission. The data for emergency operations is urgent data. Urgent data is also used later in this application to indicate data for emergency services. That is to say, the urgent data is data of a service that cannot tolerate the delay generated by the frame format in the TDD protocol of the prior art. Specifically, because of the high requirements for real-time performance, the terminal or the network side needs to respond quickly, so it requires more accurate and fast transmission, and has low tolerance to interference and errors in the data transmission process. The protocol transmission cannot meet these requirements and affects the execution of the service corresponding to the emergency data. This effect is more affected in the above-mentioned wide coverage or deep coverage scenarios, and is often extended by several tens of seconds, which may cause the network side to fail in time. The control terminal, such as the instruction cannot be released in time, etc., therefore, the emergency data is more suitable for processing using the method in the embodiment of the present invention.

As can be seen from the above, normal data and urgent data can be distinguished by the type of service corresponding to the data. For example, electricity In the network, the notification information of emergency faults (such as burnout of the electric meter, short circuit of the electric circuit, etc.), the control information of the emergency repair service or the control information of the distribution automation service are urgent data, and the information involved in the meter reading business is ordinary data. On the other hand, data for ordinary services and data for emergency services can also be identified by data structures. For example, the header of the data may be added with a scrambling sequence to indicate that the data is data of an emergency service, or a flag is left for the data header, and the data of the normal service and the data of the emergency service are distinguished by different assignments, or Different data formats and emergency data are distinguished by different encapsulation formats. The manner in which the ordinary data and the emergency data are distinguished in the embodiment of the present invention is not limited.

It should be understood that in one implementation, emergency services are preset. For example, information (such as an identifier) for indicating an emergency service is maintained in a network device and a terminal, or in a network device and a terminal, indicating that certain services are emergency services by some kind of mark. For example, these emergency services are determined by the administrator or the system to determine more urgent services according to the usage scenarios and functions of the system. That is to say, in the embodiment of the present application, both the network device and the terminal know which services are emergency services.

It should be understood that, in the TDD communication, the protocol generally specifies the timing of the data transmission and the communication and communication mode (such as the frame structure). During the transmission process, the network device occupies a control position. For example, when the terminal needs to report information, the first step is to The base station requests the reporting, and the base station receives the reporting request to allocate resources (such as a physical channel, a subframe for transmitting data, etc.) to the terminal, and the process of allocating resources is also scheduling. That is to say, even for uplink transmission, the resources used by the terminal are still scheduled by the base station. The terminal uploads data according to the resources allocated by the base station, and since the resource is allocated to the terminal by the base station, the base station knows exactly at which time from which physical channel the data transmitted by the terminal is received for demodulation.

For example, when the base station transmits the normal downlink data, the base station carries the downlink data to be transmitted through the PDSCH (Physical Downlink Shared Channel), and the terminal is notified by the PDCCH (Physical Downlink Control Channel). In which frequency band the PDSCH of the normal data is transmitted, the terminal first finds the PDSCH according to the PDCCH to receive and parse the downlink data. Similarly, when the terminal sends uplink data but does not have uplink resources (for example, the network side does not allocate an uplink channel), after the terminal sends a scheduling request (Scheduling Request) to the base station, the base station informs the terminal PUSCH through the PDCCH ( Physical Uplink Shared Channel, where the terminal finds the PUSCH according to the PDCCH to transmit uplink data using the PUSCH. Specifically, the SR in the foregoing process may be transmitted through a PRACH (Physical Random Access Channel). It should be noted that, in the transmission process of common data, the uplink or downlink transmission subframes are not only capable of transmitting data, and the control information and scheduling information of the same data flow direction may be in the resource unit (Resource Element, RE) of the data portion. RE bearer.

A person skilled in the art should understand that an RE is a unit resource in an RB (resource block resource block), an RB is a unit that carries data, and one RB represents a sub-frame resource, and is defined from a time domain and a frequency domain, and one RE Indicates the length of time of one OFDM symbol in the time domain and one subcarrier in the frequency domain. For example, in a frame structure, one RE represents the time length of 10 OFDM symbols in the time domain, and the bandwidth in the frequency domain is 25 kHz, including 16 subcarriers having a bandwidth of 1.5625 kHz.

Generally, in a TDD communication system, the transmission of a subframe depends on the uplink and downlink physical channels. For details, refer to the related paragraphs of the above description of common data transmission, for a pair of communication devices, such as a terminal and a base station, The physical channel of communication corresponds to a group of resource elements (REs) included in one RB, and these REs carry information from the physical layer. There are multiple physical channels on the uplink and downlink, such as the control channel, data channel, etc. involved in this patent. The length of each RE in the time domain is the length of one OFDM symbol, and a group of REs constitutes a resource block (including a set of consecutive OFDM symbols in the time domain and a set of consecutive subcarriers in the frequency domain), in general, A resource block has a mapping relationship with a physical channel of a terminal. If a resource block is to be used by multiple terminals, other technologies, such as code division multiple access technology CDMA, are needed.

Therefore, an embodiment of the present invention provides an information transmission method for using multiple children in a time division duplex TDD communication system. Frame transfer information. Among them, a new type of sub-frame is used, and the transmission of data is no longer considered in units of frames. There is no longer a concept of explicit frames, and there is no longer a clear ratio of sub-frames. The structure of such new sub-frames At least one of an uplink request channel and a downlink emergency control channel is introduced, so that information can be transmitted more flexibly, and a transmission waiting time of a part of information is reduced, thereby reducing the delay of the information. Especially for emergency services. The subframe in the embodiment of the present application is transmitted between a network side device (such as a base station and a gateway) of a time division duplex TDD communication system and a terminal (such as a tablet computer, a mobile phone, an electric meter, etc.), and of course, may also be in a TDD communication system. Transfer between network devices. For example, such a subframe may be transmitted in a broadcast form between a network side device and a plurality of terminals in a broadcast area (such as a cell) covered by the network side device.

The network device may communicate with a group of terminals using a subframe structure of at least one of the first subframe, the second subframe, and the third subframe described below by using a broadcast or directional transmission manner, and the group of terminals may include One or more terminals, for example, the group of terminals being a terminal in a broadcast group served by the network device or a terminal in a list related to a certain service, or one of the cells served by the network device or Multiple terminals, etc.

It should be understood that the various subframe structures mentioned below may be a subframe structure set in a pre-system, and the terminal communicates with the network device using such a subframe structure, that is, the uplink mentioned below. The request channel and the downlink emergency control channel use the network device to notify the terminal. For example, if subframes 1, 3, and 5 in one frame are included in the uplink request channel, and the uplink request channel is in the penultimate symbol, once the subframe structure is determined to be used, the terminal and the network device may transmit data before It is known by using the broadcast setting information that such a subframe structure is used, so that the corresponding channel is used at a corresponding time.

In the uplink request channel in the subframe proposed by the embodiment of the present invention, for example, the first uplink request channel of the first subframe and the second uplink request channel of the second subframe mentioned below, the terminal uses the uplink request channel to The network side device sends the report information.

The first subframe of the plurality of subframes includes a first traffic channel and a first uplink request channel. In an implementation manner, at least one of the multiple subframes includes an uplink request channel and a traffic channel. In another implementation, each of the plurality of subframes includes an uplink request channel and a traffic channel. On the other hand, there may be multiple uplink request channels and multiple traffic channels in one subframe.

In an implementation manner, the basic time unit in the subframe is still OFDM symbols, that is, one subframe includes multiple OFDM symbols, and the downlink emergency control channel, the traffic channel, and the uplink request channel mentioned above The duration is also an integer number of OFDM symbols. For convenience of description, the steps included in the transmission process will be described with reference to FIG. 5 in the transmission process between the first subframe of the plurality of subframes between one network device and one terminal. It should be understood that, since one network device can serve multiple terminals, a subframe having the first subframe structure can be transmitted between one network device and multiple terminals at the same time, or multiple groups of network devices in a TDD communication system. The transmission between the terminal and the terminal is not limited in the embodiment of the present invention. For example, a base station and a terminal in a cell, or a base station and a terminal in a plurality of cells, and the like.

On the other hand, there may be multiple downlink emergency control channels and multiple traffic channels in one subframe. For each downlink emergency control channel, the downlink emergency control channel is on the traffic channel corresponding to the downlink emergency control channel (ie, the downlink emergency) The control channel can be used to indicate the transmission mode of its corresponding traffic channel). In an implementation manner, at least one subframe of the multiple subframes, for example, the third subframe, further includes a downlink request channel. The transmission method includes:

S501: The network device transmits data to the terminal by using the first traffic channel.

S503: The network device receives the report information of the terminal by using the first uplink request channel, where the report information is a data transmission request of the second service, data of the third service, and a feedback message of the preset emergency command. At least one of The second service and the third service are preset emergency services.

It should be understood that, in fact, the S501 and S503 are merely for identifying different steps, and do not limit the order of steps. That is to say, from the perspective of the subframe structure, the first uplink channel may be divided into two parts before the first traffic channel or the first traffic channel. The embodiments of the present invention are not limited.

It should be understood that the second service and the third service may be the same service or different services. The data transmission request is used by the terminal to request the network device to upload data of an emergency service. The first service mentioned below may be an emergency service or a general service. In a case where the first service is an emergency service, at least one of the second service to the fifth service (the fourth service and the fifth service mentioned below) may be the same service.

Similar to the description of the emergency service, the command may be preset as an emergency command, and the emergency command needs the terminal to report the feedback message as soon as possible, and the feedback message may be, for example, an ACK or a NACK. It should be understood that these emergency instructions may be set by a device or a user with authority in the system, and the network device and the terminal using the method are determined through negotiation. For example, before the data is transmitted, the network device can notify the terminals in the cell which services are emergency services and which commands are emergency instructions.

In this way, the request, the data, and the feedback message of the preset emergency command are reported to the network device by using the first uplink request channel, and the service channel and the uplink request channel are provided in one subframe for emergency service and emergency. The feedback message of the instruction reserves resources, so that the reported information can be reported in a timely and flexible manner, without waiting for the data being transmitted to be sent, and transmitting in a suitable subframe in the transmission direction, thereby reducing the transmission of the information. Waiting time, thereby reducing the delay of this part of the higher reporting information required for the delay. In one case, the structure of the first subframe can be used in the existing frame structure. In the existing frame structure, each subframe defaults to an uplink subframe or a downlink subframe. If the frame is obviously unable to transmit the uplink data, it must wait until the corresponding uplink subframe is used. If the structure of the first subframe is used, the first uplink request channel can be reported in time to ensure that the information is reported. The delay can meet the needs of emergency services or emergency orders.

In one case, the uplink request channel is only used to transmit the reported information. In this way, it can be ensured that the reported information can monopolize the uplink request channel, thereby ensuring that the reported information can be uploaded as soon as possible, and the delay of the reported information is reduced. For example, the report information may be an SR (Scheduling Request). For example, when the terminal reports the data of the emergency service, it needs to send an SR to the base station to inform the base station that the uplink emergency data is to be transmitted. After receiving the SR of the terminal, the base station notifies the terminal in the subframe in the downlink emergency control channel of the next subframe. It is well prepared to report the data configuration in this subframe to become a structure suitable for uplink emergency data transmission. For another example, the uplink request channel can also transmit some urgent data with a small amount of data. For another example, the network device may also receive emergency data sent by the terminal through the uplink request channel. That is to say, in the case that the terminal has urgent data, the terminal may directly report the emergency data to the network device without requesting resources of the subsequent subframe. Such urgently reported urgent data tends to have a relatively small amount of data. In a particularly urgent case, the terminal directly uploads the data of the emergency service (the third service above) without transmitting the request information requesting to use the traffic channel transmission of the subsequent subframe (for example, the second subframe described below). Urgent data (emergency data to be transmitted using the traffic channel generally has a relatively large amount of data, and the length of the uplink request channel is insufficient to complete the transmission of these urgent data). The particularly urgent situation may correspond to the foregoing third service, for example, it may be a meter failure, a circuit burnout, or the like.

In an implementation manner, the first uplink request channel is a penultimate orthogonal frequency division multiplexed OFDM symbol of the first subframe. In an implementation manner, the first uplink request channel is a penultimate orthogonal frequency division multiplexing OFDM symbol of the first subframe. In this way, if the terminal requests the emergency data (for example, the data transmission request of the second service) to be reported to the network device in the first uplink request channel, the network device can notify the terminal in the next subframe of the first subframe. A sub-frame can report data, thereby reducing the delay of reporting data by the terminal.

In an implementation manner, the first uplink request channel may also be a first-order orthogonal frequency division multiplexing OFDM symbol of the first subframe. In this way, the network device can notify the terminal to report data in the next subframe by waiting for the next subframe of the next subframe of the first frame. It can be seen that the delay ratio is one subframe longer than the second last OFDM symbol. length. on the other hand. In another implementation manner, the downlink emergency control channel is the first OFDM symbol of the first subframe. Since the downlink emergency control channel is used to indicate the transmission direction of the traffic channel data in the subframe, such that the traffic channel of the first subframe can be controlled in time, and the traffic channel of the first subframe can also be used. Try to be as long as possible to reduce the waste of symbols in sub-frames.

It should be understood that the network device is in a control position, and may need to decide according to the interaction between the network device and the terminal, or the control of the terminal needs to decide in which subframe the data is sent (for example, the central control device in the network in the power grid determines at a certain moment) Updating the software version to the terminal in the network, such as the meter, so as to send control information on the downlink emergency transmission channel of the subframe to inform the terminal that the subframe is to send downlink data (at least one of emergency data and normal data) So that the terminal receives the transmitted data in the traffic channel.

In an implementation manner, the first subframe is a downlink subframe, the first subframe further includes a first interval, and the first interval is adjacent to the first uplink request channel, where During the first interval, the network device stops communicating with the terminal, and the network device transmits data of the first service to the terminal by using the first service channel, where the network device passes the first service. The channel transmits data of the first service to the terminal.

It should be understood that for the first interval, the transmission modes of the adjacent channels of the first interval are different. For example, the first interval is immediately adjacent to the downlink transmission traffic channel, and the first interval is immediately adjacent to the uplink request first request request channel; or in the case that the first request request channel is before the first traffic channel, after the first interval Immediately adjacent to the downlink transmission traffic channel, the first interval is immediately adjacent to the first request request channel of the uplink transmission.

In an implementation manner, the multiple subframes further include a second subframe, where the second subframe is after the first subframe, and the reporting information includes a data transmission request of the second service, where The second subframe includes a second downlink emergency control channel and a second traffic channel, and the method further includes: the network device transmitting, by using the second downlink emergency control channel, according to the data transmission request of the second service The terminal sends the second control information, where the second control information is used to indicate that the information transmission mode between the network device and the terminal is uplink transmission in the second service channel; The second service channel receives data of the second service sent by the terminal.

The second subframe may be the next subframe immediately adjacent to the first subframe, for example, in a case where the first uplink request channel of the first subframe is in the penultimate OFDM symbol, or may be after the first subframe Not adjacent to the second sub-frame.

In an implementation manner, the control information sent by the downlink emergency control channel may use a scrambling code sequence to notify the terminal whether the next data is urgent data or normal data, that is, the terminal successfully descrambles the code to indicate emergency data, and receives the downlink. Urgent data, without successful descrambling code, receives normal data by default. In another implementation manner, the control information of the downlink emergency control channel may be an information bit with a Cyclic Redundancy Check (CRC), and the terminal obtains the control information by decoding the information bits. In an implementation manner, the second subframe further includes a second interval, where the second interval is between the second traffic channel and the second downlink emergency control channel, and in the second interval And the network device stops communicating with the terminal.

In an implementation manner, the network device sends data to the terminal by using the second downlink emergency control channel. In fact, the network device can also send data to the terminal through the third downlink emergency control channel described below, which may be emergency data or normal data. In this way, the downlink emergency control channel can be used not only to deliver control information, but also to transmit data, and fully utilize the channel resources of the subframe, so that the time for transmitting data in one subframe is as long as possible, and the subframe is improved. Utilization rate. For example, in the case of less control information or in some cases mixed with existing frame structures, The three subframes are configured as uplink or downlink subframes according to the original configuration, and the third subframe does not need to change the original configuration, and the downlink emergency control channel is not wasted due to vacancy, and can be used for transmitting data, which is equivalent to maximizing Sub-frames are used to transmit data resources, which improves the utilization of sub-frames. In an implementation manner, each of the multiple subframes includes a downlink emergency control channel and a traffic channel. On the other hand, there may be multiple downlink emergency control channels and multiple traffic channels in one subframe. For each downlink emergency control channel, the downlink emergency control channel is on the traffic channel corresponding to the downlink emergency control channel (ie, the downlink emergency) The control channel can be used to indicate the transmission mode of its corresponding traffic channel).

In an implementation manner, the multiple subframes further include a third subframe, where the third subframe includes a third downlink emergency channel, a third traffic channel, and a third uplink request channel, where the third downlink emergency channel Before the third traffic channel and the third uplink request channel, the method includes:

Transmitting, by the network device, third control information to the terminal by using the third downlink emergency control channel, where the third control information is used to indicate that the network device and the terminal are in the third sub-service channel In the information transmission mode, the information transmission mode is uplink transmission or downlink transmission; and the network device communicates with the terminal by using the information transmission manner by using the third service channel;

The network device receives the report information of the terminal by using the third uplink request channel, where the report information is a data transmission request of the fourth service, data of the fifth service, and a feedback message of the preset emergency command. At least one of the fourth service and the fifth service is a preset emergency service, and the third uplink request channel is only used to transmit the report information.

It should be understood that, in one case, the control information is used to indicate an information transmission manner of a traffic channel of the third subframe and a traffic channel of at least one subframe of the third subframe. In this case, the next at least one subframe after the third subframe is at least one consecutive subframe after the subframe, and one subframe and the third subframe in the at least one consecutive subframe The frames are adjacent. In this case, the downlink emergency control channel is not required in at least one subsequent subframe of the third subframe. Therefore, the control is more flexible, and the utilization of the data transmitted by the subframe is improved, and the overhead of the subframe is reduced.

With the downlink emergency control channel, the network device and the terminal transmit data more flexibly. In the scenario where the network is needed, the network side of the subframe can negotiate the data transmission mode with the terminal, so that the uploaded data can be sent or received more quickly, thereby reducing The waiting time for sending this information reduces the delay of this part of the information. . This method is especially suitable for situations with urgent data.

That is to say, one subframe may include both an uplink request channel and a downlink emergency control channel. This has the advantages of both the uplink request channel and the downlink emergency control channel. For details, refer to the above, and no further details are provided here. It should be noted that some downlink emergency control channels mentioned in the foregoing, such as the second downlink emergency control channel and the third downlink emergency control channel, are the first OFDM symbols of the subframe in which they are located. In this way, if the terminal requests the emergency data to be reported to the network device in the first uplink request channel of the one subframe before the second subframe or the third subframe, the network device can be in the next subframe of the first subframe. The terminal is notified that the next subframe can report data, thereby reducing the delay of reporting data by the terminal.

Of course, the third subframe may also be similar to the second subframe or the first subframe, including a third interval or a fourth interval. In a case where the transmission mode of the third traffic channel is uplink transmission, the third uplink request channel and the third traffic channel include a third interval, in which the network device stops communicating with the terminal. When the transmission mode of the third service channel is downlink transmission, the third service channel and the third downlink emergency channel include a fourth interval, in which the network device stops communicating with the terminal.

In the downlink emergency control channel, the network device can use the downlink control channel to transmit control information to notify the terminal whether the transmission state to be performed in the next time period of the subframe is a single uplink or a single downlink or an existing uplink transmission. The transmission has a downlink transmission, and can even explicitly indicate the structure of the subframe, including what time period, duration of each time period, and the like. The terminal can prepare the information for uploading or receiving the information according to the received control information, and then correspondingly transmit in the traffic channel of the subframe in which the control information is located. It should be understood that the downlink emergency control channel may inform the terminal of the structure and configuration of the subframe, such as how many traffic channels are included in the subframe, the location, length, and information transmission manner of the traffic channels in the subframe. For example, the terminal can determine whether the network device has emergency data to be delivered by using a Boolean value of a certain flag bit carried in the control information sent in the downlink emergency control channel.

With the downlink emergency control channel, the network device and the terminal transmit data more flexible. In the scenario where the network is needed, the network side of the subframe subframe can negotiate the data transmission mode with the terminal. This role is especially important in the case of urgent data transmission, because ordinary data will be transmitted according to the default data transmission status specified in the protocol, and if during the transmission of ordinary data, sudden emergency data that is different from the normal data flow needs to be transmitted. The network side must inform the terminal of the configuration change of the current transmission unit on the downlink emergency control channel in advance in order to coordinate emergency data and normal data transmission. The downlink emergency control channel may also be used for the network side terminal to send an ACK (Acknowledgement)/NACK (Negative Acknowledgment) corresponding to the uplink transmission process of the previous subframe.

For the second uplink request channel and the third uplink request channel mentioned above, please refer to the description of the first uplink request channel.

For the control information mentioned above, for example, the second control information and the third control information, used to indicate the information transmission manner between the network device and the terminal in the traffic channel of the subframe corresponding to the control information. The information transmission manner is uplink transmission or downlink transmission.

Alternatively, in one case, the control information is used to indicate an information transmission manner of a traffic channel of a subframe in which the control information is located and a traffic channel of at least one subframe subsequent to a subframe in which the control information is located. In this case, the next at least one subframe after the subframe in which the control information is located is at least one consecutive subframe after the subframe, and one subframe in the at least one consecutive subframe and the control The sub-frames where the information is located are adjacent. In this case, the downlink emergency control channel is not required in at least one subsequent subframe of the subframe in which the control information is located. Therefore, the control is more flexible, and the utilization of the data transmitted by the subframe is improved, and the overhead of the subframe is reduced.

In an implementation manner, the information transmission manner may also be an uplink transmission and a downlink transmission, for example, to the second subframe or the third subframe in the foregoing, the second subframe or the third subframe includes multiple traffic channels. At least one traffic channel is an uplink transmission, at least one traffic channel is a downlink transmission, and configuration information of multiple traffic channels in the second subframe or the third subframe (eg, length, location, frequency, etc. of each traffic channel) It can be communicated to the terminal through the downlink emergency control channel.

It should be understood that the multiple subframes mentioned in the embodiments of the present application may also describe the subframe as an uplink subframe or a downlink subframe according to a transmission manner of a traffic channel in a subframe. For a subframe that includes both the uplink transmission traffic channel and the downlink transmission traffic channel, the subframe may be described according to the proportion of the symbol of the traffic channel occupied by the uplink transmission and the downlink transmission, and the transmission scheme of the traffic channel with a large ratio may be described. .

It should be understood that, in an implementation manner, the traffic channel may also transmit the reported information. However, in general, the traffic channel in the uplink subframe transmits the normal data of the uplink.

The traffic channel is used to transmit data between the network device and the terminal using uplink transmission or downlink transmission. For example, the first, second, and third traffic channels mentioned above are all traffic channels. It should be noted that at least one of normal data and emergency data may be transmitted in the traffic channel. Since a network device can often serve multiple terminals, in one implementation manner, in the traffic channel of the first subframe, the terminal reporting the normal data can be used according to the information received in the downlink emergency control channel. The resources (such as channels) that report data are given out to ensure the terminal and network reporting urgent data. Communication between devices.

It should be understood that the network device communicates with a group of terminals by using at least one of the first subframe, the second subframe, and the third subframe mentioned above, for example, the group of terminals includes multiple terminals in the same cell. In an implementation manner, the same information transmission mode is used in the same traffic channel for the multiple terminals in the same cell. It should be explained that the network device is synchronized with the time of the group of terminals, and the same traffic channel represents the same time period in the time domain. In other words, this means that the network device requires multiple terminals in the same cell to transmit data to the network device in the same period of time (ie, the same traffic channel) that the same service data is transmitted, or both receive downlink data transmitted by the network device. In this way, the information transmission mode of the same cell is synchronized in the traffic channel, and the terminals in the same cell do not interfere with each other due to different information transmission modes.

And, in the case that a certain terminal needs to send uplink emergency data, the cell network device indicates that the information transmission mode of a certain service channel is uplink transmission, and the related cell (such as a neighboring cell, or can receive the reported data in the cell) The base station in the cell of the signal of the terminal may also send a terminal indicating the terminal in the relevant cell, and the information transmission mode of the traffic channel in the same time period is also uplink transmission. In this way, the terminal in the cell does not interfere with the terminal that performs downlink transmission of data in the relevant cell. In an implementation manner, the terminal of the related cell may be configured to assist the terminal to send uplink emergency data to the base station corresponding to the relevant cell, and then the base station may receive the communication (such as through a wired communication interface, an optical fiber, etc.). The uplink emergency data that arrives is collected into the base station of the cell where the terminal that needs to report the emergency data is located, thereby improving the success rate and efficiency of the emergency data reporting. On the other hand, in a case where a terminal needs to receive downlink emergency data, the cell network device indicates that the information transmission mode of a certain traffic channel is downlink transmission, and the base station in the relevant cell (such as a neighboring cell) can also issue an indication. In the terminal in the relevant cell, the information transmission mode of the traffic channel in the same time period is also downlink transmission, so that the terminal of the neighboring cell can be prevented from causing interference to the terminal that needs to receive the emergency data due to the uplink transmission of data. Further, the base station of the neighboring cell can also help to send emergency data in the traffic channel to improve the success rate and efficiency of emergency data reception. Optionally, a cell that has strong interference to a non-adjacent cell but also transmits data to the cell may use multiple receive antenna technologies to suppress interference.

In another implementation manner, the network device may use the request information reported by the uplink request channel in the subframe before the third subframe, or the network device according to the service requirement or control requirement (for example, the control device requirement of the network in the power grid) The terminal in the network reacts to the working state of the terminal or the reading of the terminal, and the third subframe requests the terminal to report data (at least one of emergency data and normal data), and the information transmission mode in the third subframe is uplink transmission. .

For the third subframe, in the case that the indicated transmission mode is uplink transmission and downlink transmission, the third traffic channel includes at least one traffic channel whose transmission mode is downlink transmission and at least one traffic channel whose transmission mode is uplink transmission. The network device receives the data sent by the terminal according to the information transmission manner of the uplink transmission in a service channel whose transmission mode is uplink transmission; and the network device according to the service channel whose transmission mode is downlink transmission, The information transmission mode of the downlink transmission sends data to the terminal. For specific implementations and descriptions, refer to the related descriptions above.

In other words, it may be specified that a plurality of time segments corresponding to different transmission modes are included in the traffic channel, and the network device may notify the terminal to prepare corresponding resources by using control information sent in the downlink emergency control channel of the subframe. The traffic channel in the subframe receives and transmits information, which makes the subframe structure more flexible, reduces the transmission waiting time of the data, and reduces the delay of the information.

. Such a flexible subframe structure can be used in a case where uplink emergency data and downlink emergency data need to be transmitted in one subframe. In this case, further, between different traffic channels in the forward direction, an interval (similar to the first interval or the second interval mentioned above) should be included, in which the network device stops communicating with the terminal. .

Optionally, placing the uplink time period (such as the uplink request channel and the second traffic channel) together, and placing the downlink time period (such as the following emergency control channel and the first traffic channel) together, can reduce required The guard interval is such that the utilization of the subframe is high, and the subframe is not cut too fragmented.

上行的紧急数据发生碰撞的概率为It should be understood that the uplink transmission traffic channel mentioned above may be used for multiple terminals to upload emergency data, and the downlink transmission traffic channel may be used by the network device to send emergency data to multiple terminals. In the case of transmitting data to a plurality of terminals in one traffic channel, there is a certain probability that collisions between data occur, that is, data interfere with each other. For ordinary data, this kind of interference can be tolerated, and for urgent data, the accuracy of its transmission can be used to reduce the interference. Some means may be used to prevent collisions caused by data in different transmission directions being transmitted in the same subframe, for example, using code division multiple access CDMA technology, or data of different transmission directions using different frequency points for transmission. The following briefly explains the situation of collision. It is assumed that a single cell has uplink emergency data sent by N terminals at T(ms) time (each terminal only needs to report urgent data once during this time), and the adjacent uplink request channel The time interval is T _u , then the total number of uplink request channels during this time is

The probability of collision of upstream emergency data is

Similarly, multiple downlink emergency data also have a probability of collision in one subframe transmission.

The first interval, the second interval, the third interval, and the fourth interval mentioned above may be a full guard interval (full GP) for avoiding interference between uplink and downlink transmission data and protecting data transmission. The accuracy. This is because in a TDD communication system, a network device often has a certain coverage and communicates with multiple terminals. Although in theory, the terminal should be consistent with the time of the network device, and multiple terminals have different device pairs due to different positions. The calculation of the time period corresponding to each channel in the frame has a deviation, that is, a so-called unsynchronization problem occurs, or, in order to achieve synchronization, the terminal that needs to upload data starts to upload in advance, so when the data is switched up and down in the subframe, interference. Optionally, the foregoing interval exists in the case that the traffic channel of the subframe transmits emergency data. Because urgent data not only has high requirements for delay, but also needs to minimize interference to ensure the accuracy of data, it is worthwhile to sacrifice the communication time in some sub-frames; for ordinary data, because the distortion of its transmission is It is permissible, and it is desirable to communicate as long as possible in the subframe. It is not necessary to use the above guard interval. Of course, for normal data, the use of such interval is also allowed. Based on the accuracy of the data (often related to the coverage of the system, such as the radius of the cell) and the communication time of the subframe, different values of the guard interval can be obtained. In one implementation, at least three aspects must be considered when designing the length of the guard interval. (1) Switching time (2) Signal round-trip transmission delay in the cell (3) Data processing time. Generally, the handover time is fixed (for example, the LTE system can be 40 us), the cell round-trip delay is related to the size of the cell coverage, and the data processing time is related to the size of the data to be transmitted. For example, if the cell radius is 60km and the round trip delay is 2*60*1000/300000000=400us, then the GP size must be greater than 400us+40us because data processing time is still required. For another example, for the IoT 230 system, the maximum guard cell length may be up to one OFDM symbol length when the maximum supported cell radius is 100 km.

The calculation of the guard interval is described below using an example, which can be understood in conjunction with FIG. FIG. 6 is a diagram for explaining data interference caused by transmission in the embodiment of the present invention. For example, in the base station, the terminal 1, and the terminal 2 in FIG. 6, the base station 10 points are used as the reference time. If no GP is added, it means that the downlink transmission and the uplink transmission in the frame structure are in close proximity, that is, 10 points are the end of the downlink. The time is also the time to start. The downlink time of the entire base station transmitting to the terminal 1 at 10 o'clock reaches the terminal 1 at 10:02, and t1=2 min. In order to ensure that its uplink data can reach the base station at 10 o'clock, the terminal 2 must consider its own path delay in advance and upload data at 9:59, t2=1min. The terminal 1 is always in the state of receiving data, and the terminal 1 receives the data of the terminal 1 at 9:59:30, Dt=0.5min. Then the interference time is 9:59:30 to 10:02, for a total of 2.5min. Therefore, in order to avoid interference, only the uplink transmission can be delayed, that is, the guard interval is added. The guard interval is at least 2.5 min. It should be understood that the schematic description herein is for exemplifying the path delay caused by the location difference between the terminal and the network device. In actual setting, the duration of the protection interval also needs to consider the network device and the terminal required to switch the data transmission direction. Time, and the time that the network device or terminal processes the received data. Therefore, in this example, the guard interval should be longer than 2.5 min.

On the other hand, in a subframe in which normal data is transmitted, between channels of different transmission directions, for example, a downlink control channel and an information transmission direction are uplink transmission traffic channels, or an uplink request channel and an information transmission direction are downlink transmission traffic channels. There may also be an interval, which may also be referred to as a small Guard Period (sGP), so the first interval, the second interval, the third interval, and the fourth interval mentioned above may also be used. It is such a small interval. This small interval is the time required to consider the switching of the device to complete the transmission direction. In fact, the data is changed from the hair to the receiver, and the power of the transmitter cannot disappear immediately. There is a decline process. In the same way, the data changes from receiving to sending, and the receiver takes time to put the power up. In LTE, the requirements for these two times are the same, usually not exceeding 20us. For example, for the downlink normal data transmission, if there is an uplink request channel in the subframe, an interval needs to be left between the downlink traffic channel and the uplink request channel, including at least a downlink to uplink switching time, to ensure that the base station can receive after sending normal data. Upstream control data. After the base station receives the uplink control data, it may need to send an emergency data transmission notification in the downlink emergency control channel of the subsequent subframe, and there is also a switching time between the transmission and reception. In one embodiment, the two switching times can be set in the sGP before the uplink request channel. That is to say, in an implementation manner, in a subframe for transmitting downlink normal data, the sGP between the traffic channel and the uplink request channel includes at least an uplink to downlink handover time and a downlink to uplink handover time.

Various subframes used by the network device and the terminal for communication are described in the embodiment of the present invention, and they may also include some variant structures. For example, one subframe may further include one of a downlink emergency control channel and an uplink request channel, or a fourth subframe including a downlink emergency control channel and a traffic channel without including an uplink request channel may also exist in multiple subframes. The control information sent by the network device in the fourth subframe may be caused by at least one subframe after the fourth subframe according to the control information. This can make the structure of the subframe more diverse, and better meet the low latency requirements of data transmission in different scenarios and systems.

In the frame structure mentioned above, the downlink emergency control channel is placed at the subframe header, and the network device can achieve the purpose of better controlling the data transmission between the intraframe and the terminal, and placing the uplink request channel at the end of the subframe or The penultimate OFDM enables the terminal to feed back the data transmission of the frame to the network side in a timely manner, and send the uplink emergency to the network side in time. begging.

Optionally, the network device may send, by using a broadcast channel, a handover instruction, where the handover instruction is used to enable or disable transmission of the subframe described in the embodiment of the present invention in a network where the network device is located. Or the function of the indication instruction is implemented by a 1 bit in a System Information Block (SIB) in the broadcast channel, and the SIB may be part of the cell information transmitted by the broadcast channel. It should be understood that any terminal needs to access the cell, and after receiving synchronization, some cell information is received, and the cell information is used to indicate the configuration of the terminal communicating with the base station in the cell. Therefore, the system sends the cell information to the time-frequency location and The cycle is fixed, and this process is often the configuration process before data transmission, so the SIB will not be used as data by the terminal. That is, the network device can be switched in the transmission of the subframe structure and the existing frame structure introduced in the embodiment of the present invention, so that the subframe structure described in the embodiment of the present invention is more used in the existing system architecture. Convenient and flexible. For example, due to the access of some new devices in the network system, or the changes in the types of services handled in the network system or the changes in service requirements, it is not necessary to transmit such a subframe structure in the system for a certain period of time.

In the following, for ease of understanding, a process in which a network device controls a terminal through a downlink emergency control channel is described. For example, in one case, the control information is sent on the downlink emergency control channel only in the case of emergency data transmission. The specific implementation of the control information may be: using an indicator, when the indicator takes a specific value, The traffic channel indicating a subframe is reserved for downlink emergency data usage. For example, if the network device sends index 0 on the downlink emergency control channel (0 is regarded as a special value), it indicates that there is emergency downlink data to use the subframe. When the indicator takes another series of values, the UE-specific index, such as the number, is given to each terminal according to its own unique identity certificate (such as the SIM card ID or device ID) of all emergency terminals in the cell. Then: terminal 1 - terminal N (assuming there are N emergency terminals), if the downlink emergency control channel sends any one of index 1-N, it indicates that the corresponding terminal uses the subframe to transmit its uplink emergency data. When the indicator is carried in the control information, such as the index field, there is no urgent data to transmit.

The following is an example to explain how the network device interacts with the terminal in the case of using the above indicator. In this case, the network device can determine which are the emergency terminals and which are the normal terminals (for example, according to the services deployed by the terminals, each The location of the terminal, the type of each terminal, etc.), the emergency terminal is a terminal that has emergency data to be sent and received, and the ordinary terminal is a terminal that does not have emergency data to send and receive. Each sub-frame has a system default information transmission mode. When there is a demand (for example, there is a burst of urgent data to be transmitted), the information transmission mode of the sub-frame can be changed through the downlink emergency control channel. The base station receives or transmits data according to the system default mode of the subframe. In the process of data transmission, every time an uplink emergency request channel is encountered, it is necessary to detect whether there is uplink request information sent, and the network device does not receive an uplink request in one subframe. The information does not send any index in the next frame of the subframe or the downlink emergency control channel of the next frame. In this case, if the next frame or the next frame is a downlink subframe, the downlink subframe The downlink emergency control channel transmits normal data; if it is an uplink subframe, the downlink emergency control channel in the uplink subframe is empty. Similarly, a large number of ordinary terminals (terminals that have no urgent data to send and receive) receive or transmit corresponding data according to the default state of each subframe. In the process of data transmission, the terminal has to detect the information every time it encounters the downlink control channel, and finds that the base station does not send any index, indicating that there is no urgent data to be transmitted, and the terminal transmits according to the default state. All emergency terminals (terminals with urgent data to be sent and received) always keep online connection with the system. When there is no urgent data to receive or send, the information is still detected in each downlink emergency control channel, and no index is detected. There is no downlink urgent data to receive.

If the base station needs to send emergency downlink data to some terminals, the base station side sends index 0 on the latest downlink emergency control channel in the frame structure, and sends scheduling information and emergency downlink data to a terminal in the traffic channel of the subframe. On the terminal side, all related terminals (including all emergency terminals and ordinary terminals being transmitted) detect information on the downlink emergency control channel, and the normal terminal detects that there is an index (the ordinary terminal does not need to solve the specific index value), and temporarily suspends data transmission. All emergency terminals detect that there is an index and further resolve the specific index 0, realizing that they may need to receive in this subframe Downstream emergency data. Immediately following the demodulation information of the traffic channel corresponding to the subframe (because the emergency terminal does not know which emergency terminal is specifically used for the subframe), only one or several emergency terminals can successfully solve the scheduling information, indicating that the terminal It is necessary to receive downlink data in the subframe, that is, to decide to continue receiving the corresponding emergency data according to the scheduling information sent by the base station. The emergency terminal that is not scheduled in this subframe is that the base station further arranges to receive emergency data in other subframes, and these emergency terminals detect the information received in the downlink emergency control channel in the next subframe.

If the emergency terminal needs to transmit urgent data, first send the request information to the base station in the latest uplink request channel in the frame structure (if there are multiple emergency terminals that need to be transmitted, they can be sent together), at this time, the base station knows which terminals want to send Urgent data. Suppose that there are 3 terminals that have sent requests, and their IDs correspond to numbers 2, 10, and 15, respectively.

FIG. 7 shows a schematic diagram of control information distribution that can be employed in a wideband system and a narrowband system. In FIG. 7, the uplink emergency data is transmitted as an example, so that the subframe shown in FIG. 7 is differently filled from the header to the end of the frame. The rectangle of the pattern sequentially represents: a downlink emergency control channel, a first interval, a traffic channel (upstream), an uplink request channel, and a traffic channel. For example, if it is a broadband system, FDM can be used for notification. For example, the entire system bandwidth is divided into three parts (implementation-dependent, specifically can be divided into several parts to see the system bandwidth, not wide enough may be divided into two parts in a sub-frame frequency domain), the base station in the subframe structure, the most recent, time domain The index of the three terminals is respectively transmitted in the resources occupying the downlink emergency control channel and occupying the 1/3 band (three different segments) in the frequency domain. On the terminal side, the normal terminal that is transmitting data detects the index on the downlink emergency control channel (the normal terminal does not need to solve the specific index value), and temporarily interrupts the data transmission; those terminals that have sent the emergency uplink request always expect to be in the downlink emergency. The control channel receives its own index, so it focuses on detecting its own index on the downlink emergency control channel, and then transmits the corresponding index in different frequency bands to transmit urgent data in the immediately following data channel resources (in time, the three terminals are In a sub-frame). If it is a narrowband system, it is notified by TDM. The base station sends the index (egindex 10) of a specific terminal on the latest downlink emergency control channel. It can be seen that in the TDM mode, only one emergency terminal can be notified in one subframe, which helps to improve data transmission. The accuracy rate. On the terminal side, the normal terminal that is transmitting detects the information on the downlink emergency control channel, detects that there is an index (the ordinary terminal does not need to solve the specific index value), and temporarily interrupts the data transmission; those terminals that have sent the emergency uplink request know their own expectations. The downlink emergency control channel receives its own index. Therefore, the downlink emergency control channel focuses on detecting whether there is its own index. Only the terminal with index 10 can successfully parse (such as CRC) the complete control information, and determine that it can be in the subframe. The data part sends uplink emergency data. If the other terminal does not receive the index representing itself, it continues to receive in the next subframe.

In summary, when the ordinary terminal transmits data, it encounters the downlink emergency control channel to receive information, and does not receive the control information with index, and then continues communication. When the control information with index is detected, the communication is temporarily interrupted. When the emergency terminal encounters the downlink emergency control channel, it receives the information. When the control information with the index is received, the emergency terminal parses the index (the terminal that has sent the uplink emergency request checks whether the index matches its own index). If the index 0 is detected, the traffic channel receives the scheduling information and receives the downlink emergency data according to the scheduling information, and if the index corresponding to the self is detected, it indicates that the emergency data can be reported on the subframe traffic channel (the request has been reported previously) ). It should be understood that the implementation manner is only an example, and the embodiment of the present invention does not limit how to implement control information and how to perform communication according to the control information.

Combined with the above description, it can be considered that the data transmission of the TDD communication system always involves uplink data transmission and downlink data transmission, and in order to better control the transmission process, the downlink emergency control channel and the uplink request channel are introduced, for different systems and Different sub-frame structures can be used for the scenario, the network side, and the terminal side. For ease of understanding, the following description is made with reference to FIG. 8 and FIG. FIG. 8 depicts an interaction flow in a subframe structure of uplink emergency data transmission, and FIG. 9 illustrates an interaction flow in a subframe structure of downlink emergency data transmission.

As shown in FIG. 8 , in a group of terminals, the terminal has uplink urgent data to be transmitted, and the terminal to transmit the emergency data transmits the SR to the base station through the uplink request channel in an uplink request channel of the subframe, and the base station receives the terminal. SR, knows that the terminal has uplink urgent data to send. The downlink emergency control channel of the next subframe transmits the specific configuration of the subframe (such as the duration of the traffic channel, indicating that the traffic channel can be reported, etc.) to the group of terminals through the downlink control channel, and receives the downlink emergency control channel. After the specific configuration, the terminal in the group to which the normal data is to be uploaded may be allowed to be retired according to the specific configuration to better ensure the communication between the terminal and the base station to which the emergency data is to be uploaded. After the guard interval has elapsed, the terminal to which the emergency data is to be uploaded is transmitted to the base station on the traffic channel, and the emergency data is transmitted to the base station through the uplink data channel. After receiving the emergency data, the base station performs analysis to confirm whether retransmission is required, and if the received data is confirmed. If the emergency data is correct, no retransmission is needed. The base station replies to the terminal ACK of the reported data through the downlink control channel in the downlink emergency control channel of the next subframe, and retransmits if the received urgent data error is confirmed, and the base station is next. The downlink emergency control channel of the subframe is replied to the terminal NACK of the reported data through the downlink control channel, and notifies the corresponding terminal in the specific configuration of the next subframe, so that the terminals retransmit the emergency data in the next subframe. After receiving the retransmitted emergency data, the base station parses the retransmitted emergency data together with the emergency data received in the previous frame to confirm whether retransmission is needed, and if there is no need to retransmit, ACK is returned, if retransmission is still needed Then repeat the above process again in the next subframe of the next subframe until there is no need to retransmit or reach the upper limit of the number of retransmissions. .

It should be noted that the preparation work before the uplink emergency data transmission, for example, first obtains uplink synchronization and establishes a connection with the cell through the uplink random access procedure, and the terminal sends an uplink reference signal to the base station to let the base station know the uplink channel in real time. The quality of the above, the above process is not described.

In another scenario, as shown in FIG. 9, the base station has downlink emergency data to be transmitted, and the base station sends a specific configuration of the subframe to a group of terminals in a downlink emergency control channel of a subframe (such as the duration of the traffic channel, notification). The emergency data is sent on the service channel, and the emergency data is sent to the terminal on the traffic channel of the subframe. After the downlink emergency control channel receives the specific configuration, the terminal does not need to receive the emergency data. Network resources (such as channels) are given out according to the specific configuration to better ensure communication between the terminal and the base station that need to receive emergency data. The terminal that needs to receive the emergency data demodulates the received downlink data to determine whether a retransmission request needs to be sent to the base station, and if the demodulation is successful, no retransmission is needed, and the terminal requests the channel in the uplink of the subframe, and uses the uplink request channel. Sending an ACK to the base station; if the demodulation fails, retransmission is required, the terminal requests a channel on the uplink request channel, and sends a NACK and a retransmission request to the base station through the uplink request channel; if retransmission is required, the base station receives the data according to the reception. The NACK and the retransmission request, the downlink emergency control channel of the next subframe sends the specific configuration of the subframe to the terminal to receive the emergency data, and the emergency data is sent to the group of terminals in the traffic channel of the subframe, so that The terminal in the group terminal that needs to receive the emergency data again receives the emergency data on the downlink emergency control channel, and demodulates the received emergency data twice to determine whether it needs to be retransmitted again, and if it does not need to retransmit, ACK is returned, if still needed The retransmission repeats the above process again in the next subframe of the next subframe until no retransmission is required or the upper limit of the number of retransmissions is reached.

It should be noted that the preparatory work to be performed before the downlink emergency data transmission, for example, the process of performing cell search, obtaining downlink synchronization, and acquiring broadcast information of the cell, etc., is not described in detail.

In summary, by adding a downlink emergency control channel and an uplink request channel to a subframe, the control of data transmission under the TDD protocol is enhanced, and the transmission waiting time of a part of information is reduced, thereby reducing the delay of the information, so that TDD is enabled. The frame structure in the communication system is more flexible and more suitable for transmitting urgent data. Further, considering the hardware processing characteristics of the network device and the terminal in the process of transmitting and receiving data, the downlink emergency control channel and the location of the uplink request channel are reasonably designed to further reduce the delay of the data. Moreover, in the case of transmitting emergency data, the protection interval is added, which improves the accuracy of data transmission, and is more in line with the requirements of low-latency and high-accuracy of emergency data transmission.

In summary, it can be understood that inserting the downlink emergency control channel and the uplink request channel in the subframe can reduce the data transmission waiting time, thereby reducing the delay of the information, especially for emergency data. Preferably, the data in the embodiment of the present invention is used to mix data with the frame structure of the prior art. The urgent data preferentially occupies the subframe in the embodiment of the present invention, and the prior art subframe is used for the common data. Structure and resource allocation methods, which can better be compatible with existing transmission habits, and avoid introducing too many downlink emergency control channels and uplink request channels, occupying traffic channels and affecting the transmission of common data. In this case, the denser the downlink emergency control channel and the uplink request channel are inserted, the more the small blocks are divided into smaller blocks, and the more resources that can transmit ordinary data are occupied, but the emergency is reduced. The better the delay of the data, in the method of the embodiment of the present invention in combination with the existing TDD communication system and frame structure, the proportion of the subframe in which the above-mentioned time period and only the traffic channel are included in the frame structure can be designed as needed.

In the following, with reference to FIG. 10 and FIG. 11, the system frame of the IoT 230 introduced in the above is taken as an example. In the system scenario, the system frame is partially improved in combination with the method of the embodiment of the present invention. The communication process, which partially preserves the frame structure of the IoT 230 system frame, is easier to promote in the existing IoT 230 system. In this scenario, a modification is described using a frame in the original IoT 230 system as an example. For convenience of description, such a frame is referred to as an improved frame. It should be understood that, for convenience of explanation, FIGS. 10 and 11 only exemplarily illustrate a case where one subframe includes a traffic channel of an information transmission mode.

In FIG. 10, it is illustrated that a terminal and a base station communicate using a time division duplex (TDD) frame, and one frame in the original IoT 230 system evolves for an improved frame structure. In the frame structure shown in FIG. 10, the information transmission mode of the downlink basic structure (that is, the downlink subframe) defaults to downlink transmission data, and the information transmission mode of the uplink basic structure (ie, uplink subframe) defaults to uplink transmission data. Under normal circumstances, ordinary data transmission can be carried out according to the default information transmission mode. In FIG. 10, the information transmission mode of the default setting is not changed, and the special subframe is changed to the downlink subframe. In FIG. 10, a downlink basic structure enlarged and described is used for transmitting normal data. In this case, downlink data can be transmitted in the downlink emergency control channel, and the downlink emergency control channel is not explicitly drawn in the downlink basic structure, that is, From the beginning of the frame to the end of the frame, there are traffic channels, small intervals and uplink request channels. For example, the second subframe in the above embodiment may specifically be such a structure. In FIG. 10, an uplink basic structure enlargedly described is used for transmitting normal data. In this case, a guard interval or a small guard period (sGP) may be included, and FIG. 10 includes a guard interval (GP). That is, from the frame header to the end of the frame, the downlink emergency control channel, the guard interval, the traffic channel, and the uplink request channel.

It should be understood that, in one case, the control information transmitted by the downlink control channel of a certain subframe may control the information transmission state of a plurality of consecutive subframes. The control information may be used to indicate an information transmission manner of a traffic channel of the first subframe and a traffic channel of at least one subframe of the next subframe. In this case, the next at least one subframe after the first subframe is at least one consecutive subframe after the subframe, and one subframe and the first subframe in the at least one consecutive subframe The frames are adjacent. In this case, the downlink emergency control channel is not required in at least one subsequent subframe of the first subframe. Thereby, the control is more flexible, and the utilization of the subframe transmission data is improved, and the overhead of the subframe is reduced.

In the case that the urgent data is to be transmitted, in order to reduce the transmission waiting time of the emergency data, thereby reducing the delay of the part of the information, the basic structure of the frame in FIG. 4 can be improved by the method in the embodiment of the present invention. For example, FIG. 10 and FIG. An improved manner is that each subframe of the original IoT230 system frame may include a downlink emergency control channel and an uplink request channel, and may retain the first seven subframes as downlink subframes, and the last seven subframes are uplink subframe structures. The special subframe can be changed to a downlink or uplink subframe or not. When transmitting normal data, the subframe can include the sGP mentioned above, and the length is 40 us. In FIG. 11, a case where emergency data is transmitted in one frame is illustrated, which involves a subframe structure for transmitting emergency data, for example, the fourth subframe and the 14th subframe of the frame need to transmit downlink emergency data, of which 14th The default data transmission mode of each subframe is uplink transmission, and the two subframes are downlink emergency from the beginning of the frame to the end of the frame. Control channel, traffic channel, guard interval and uplink request channel. The seventh subframe and the eleventh subframe of the subframe need to transmit uplink emergency data, wherein the default data transmission mode of the seventh subframe is uplink transmission, and the two subframes are downlink emergency control channels from the beginning of the frame to the end of the frame. , guard interval, traffic channel and uplink request channel. The original special subframe, that is, the 8th subframe, is still improved to the downlink subframe. It should be understood that, in an implementation manner, in order to ensure the accuracy of emergency data transmission and the exclusiveness of resources, the transmission of normal data is interrupted in a subframe in which emergency data is transmitted.

Specifically, the uplink emergency data is transmitted in a downlink subframe (the first seven subframes of an IoT230 system frame), and in the downlink subframe, the downlink emergency control channel is used by the terminal to learn the current sub-subject according to the received control information. The structure of the frame is changed. If the traffic channel of the downlink subframe needs to upload emergency data (such terminal is called an emergency terminal), then the transmission is performed, and the downlink emergency control channel and the traffic channel in the downlink subframe are used. There is a guard interval between them. Specifically, in terms of timing, the uplink emergency data is to be transmitted in the downlink subframe, and the terminal should send an SR to the base station from the uplink request channel of the previous subframe of the previous subframe of the downlink subframe to notify the base station that the uplink is to be sent. Uplink emergency data, in which the base station broadcasts control information to a group of terminals on the downlink emergency control channel of the subframe, where the common terminal in the group of terminals does not need to transmit emergency data to the base station in the downlink subframe. The terminal receives the control information and gives up the resources for emergency terminal use, that is, the ordinary terminal does not receive the corresponding data of the ordinary terminal in the subframe, and only maintains communication with the base station, and the data transmission between the ordinary terminal and the base station can be maintained. A low rate, and the network device does not receive the ACK of the normal data received by the normal device, and the data that the ordinary terminal needs to receive is sent again in a subsequent subframe. It can be understood that, in this case, the ordinary terminal delays receiving the downlink data to be received by the ordinary terminal, and the emergency terminal receives the control information and directly transmits the uplink emergency data on the traffic channel (it is not required to receive the base station as usual data. The uplink resource PUSCH allocated by the downlink control channel PDCCH. Specifically, when the downlink emergency control channel is at the frame header and the uplink request channel is at the end of the frame, the delay of the uplink emergency data is 3 transmission units, that is, 3TTI, which is 24 ms.

Similarly, the downlink emergency data arrives in the uplink subframe (the last seven subframes of an IoT230 system frame). In the uplink subframe, the downlink emergency control channel is used by the terminal to learn that the current subframe structure occurs according to the received information. In the traffic channel of the uplink subframe, if it is required to transmit emergency data (such terminal is called an emergency terminal), downlink transmission is performed, and the downlink transmission process does not require the base station to notify the terminal data which PDSCH to use by using the downlink scheduling PDCCH. Receiving data directly by transmission, and for ordinary terminal, since there is no uplink urgent data to be transmitted, after receiving the control information, the resource is given out for emergency terminal use, and between the uplink request channel and the traffic channel of the uplink subframe There is a guard interval. Specifically, when the downlink emergency control channel is at the frame header and the uplink request channel is at the end of the frame, the delay of the downlink emergency data is 2 transmission units, that is, 2 TTIs, which is 16 ms.

In an implementation manner, in the case of downlink transmission of emergency data, in order to avoid interference of terminals in the same cell, the base station adjusts the data transmission manners of the service channels corresponding to the entire cell at the same time. Even in order to avoid interference of neighboring cells or related cells, several neighboring base stations adjust the data transmission manners of the traffic channels corresponding to several neighboring cells at the same time. For further explanation, please refer to the relevant paragraphs in the previous section, which will not be repeated here. Figure 12 illustrates the case where the terminal has to receive urgent downlink data in the default uplink subframe. In the same period of time (one frame corresponding to the same period of time) of the three terminals that affect each other, in one of the default uplink subframes, one of the terminals receives the control information, and receives an emergency in the subframe. Downlink data, while the other two terminals are ordinary terminals in the subframe, the two base stations corresponding to the three terminals send downlink emergency data in the traffic channel of the subframe for the emergency terminal to receive, and the other two Ordinary terminals stop sending ordinary data.

Correspondingly, in another implementation manner, in the case of uplink transmission of emergency data, in order to avoid interference to terminals in the same cell, the base station adjusts the data transmission manners of the service channels corresponding to the entire cell at the same time. Even, in order to avoid interference with neighboring cells or related cells, several neighboring base stations will correspond to several neighboring cells at the same time. The data transmission mode of the traffic channel is adjusted to be consistent. For further explanation, please refer to the relevant paragraphs in the previous section, which will not be repeated here. Figure 13 illustrates the case where the terminal has to upload urgent uplink data in the default downlink subframe. In the same period of time (the same period of time corresponds to one frame) of the three terminals that affect each other, in one of the default downlink subframes, one of the terminals reports the request in one subframe, requesting to send urgent uplink data. Then, in the subframe after the subframe (the fourth subframe is shown), the emergency terminal receives control information, in which urgent uplink data is to be transmitted, and the other two terminals are in the subframe. Ordinary terminal, the two base stations corresponding to the three terminals (one of the base stations is in the same cell as the emergency terminal, and the other base station is a base station of the relevant cell capable of receiving emergency terminal data), and the traffic channels of the subframe are received. Upstream emergency data to further ensure the transmission of the urgent data, while the other two ordinary terminals stop transmitting ordinary data.

On the other hand, it should be understood that FIG. 10 and FIG. 11 are merely exemplary descriptions. In practice, the configuration of a subframe, such as the information transmission manner of the traffic channel, and the interval involved, are all performed by each of the downlink emergency control channels. The manner of the subframe arrangement illustrated in the control information is not limited to the method and the frame structure improvement scheme described in the embodiments of the present invention. For example, multiple traffic channels may be included in one subframe, and the multiple traffic channels may have different information transmission modes.

On the other hand, because the improved frame structure is more flexible in terms of the uplink and downlink transmission requirements of the data, the eighth subframe of the original IoT230 system frame, that is, the special subframe can also be used to transmit uplink or downlink data, and the base station is in the special The downlink emergency control channel of the subframe sends control information to the terminal to inform the terminal of how the special subframe should be communicated, and details are not described herein again. In a special subframe, whether it is ordinary data or urgent data transmission, there is a corresponding transmission structure, that is to say, the special subframe has no special meaning in the design, that is, an improved uplink subframe or downlink subframe. This is also an important aspect of reducing latency. In the following analysis, the uniformity of the structure of the special transmission unit and the uplink and downlink transmission unit can also be seen.

In one case, the special subframe may include a special control channel, and the control device in the base station or the network may use the broadcast mode in the special control channel to notify the terminal to use or stop using the modified subframe. That is to say, in this way, switching between the existing IoT230 system frame structure and the improved subframe structure can be controlled according to specific situations, such as service requirements, networking structure changes, etc., and is more flexible and convenient, and existing The frame structure is compatible.

In an implementation manner of the foregoing process, the emergency data may be transmitted in the same sub-frame traffic channel as the normal data, and the emergency data is transmitted in the first few OFDM symbols of the traffic channel (because the characteristics of the emergency data are generally small traffic and data volume) Fixed), the remaining OFDM symbol of the traffic channel can still be used to transmit common data; on the other hand, the downlink emergency data is different from the normal data transmitted by the downlink subframe in the case of the traffic channel transmission of the downlink subframe. The base station sends control information to the downlink emergency control channel of the downlink subframe to notify the terminal of the specific configuration of the current subframe (that is, the UE does not need to use the downlink scheduling PDCCH to notify the terminal data of which PDSCH transmission is used by the base station, but allows the emergency terminal to directly receive The data, as well as the protection interval GP), and the downlink emergency data are transmitted in the data transmission part. The ordinary terminal that is transmitting receives the control information and gives the resources to the emergency terminal (that is, the ordinary terminal delays receiving the downlink data), and the emergency terminal receives the control information and directly receives the downlink emergency data on the traffic channel.

On the other hand, for the case where the uplink and downlink emergency data need to be transmitted in one subframe at the same time, the scenario of the IoT230 system is also taken as an example. Two information transmission methods can be included in one transmission unit. In general, emergency data can be sent over several OFDM symbols. Therefore, it is achievable to transmit uplink and downlink emergency data in the same subframe. It can be considered that the subframe includes two traffic channels, and can also be considered as The traffic channel of the subframe includes two sub-service channels. The sub-service channel close to the downlink emergency control channel transmits the downlink emergency data, and the other sub-service channel transmits the uplink emergency data. The proportion of the duration of the specific uplink and downlink data transmission is notified to the terminal in advance by the base station in the downlink control, in order to avoid the uplink and downlink. Inter-interference, a guard interval GP is required between the downlink emergency data and the uplink emergency data. The ordinary terminal receives the base station notification to give up the resource (that is, the ordinary terminal receiving the downlink data delays receiving the downlink data/generating the uplink data The terminal delays transmitting uplink data. The emergency terminal transmits uplink emergency data (uplink emergency terminal)/receive downlink emergency data (downlink emergency terminal) in the corresponding data transmission part. When the uplink and downlink emergency data are transmitted in the same transmission unit, when the downlink emergency control channel is at the frame header and the uplink request channel is at the end of the frame, the uplink delay is 3 subframes, that is, 3TTI, which is 24 ms, and the downlink delay is 2 The length of the subframe is 2TTI, which is 16ms.

It can be seen that the frame structure of the system frame of the IoT 230 adopts the above improvement, and both the uplink delay and the downlink delay are reduced. Further, adding the guard interval can also meet the accuracy requirement of the emergency data.

The effect of delay on the use of an improved frame structure will be described below with reference to FIG. 14 in a specific example. 14 is a schematic diagram of inserting a downlink emergency control channel and an uplink request channel into a partial subframe in a frame, and performing data transmission using the improved frame structure. 10 to 14 are only schematic, and it is not limited to include a downlink emergency control channel or an uplink control channel in each subframe.

The delay is related to the density of the above two types of channel insertion. The delay is required to be low, the insertion is dense, and the overhead in the subframe is large. The overhead refers to the time of the subframe occupied by the non-traffic channel in the subframe. The frame structure of a TDD communication system is taken as an example. The frame structure of the TDD communication system has a length of 5 ms per subframe, and the maximum delay of the emergency data is calculated (that is, the moment when the terminal has uplink emergency data to be sent just misses the uplink. The urgently requested channel; the moment when the downlink emergency data arrives just misses the downlink emergency control channel, and the network device does not have time to notify the terminal to receive data when the downlink emergency data arrives. Using the improvement of the embodiment of the present invention for the system frame, the downlink emergency control channel is set in the subframe header (the first OFDM symbol) of each subframe of a system frame, at the end of each subframe (the last OFDM) Symbol) Set the uplink request channel. One frame of the system includes 15 subframes, and the default settings of the first to fifth, seventh, and fourteenth are downlink subframes.

As shown in FIG. 14, in a downlink subframe, a terminal needs to send uplink emergency data to the system, and the terminal sends an emergency uplink request (SR) on the uplink request channel of the downlink subframe. After one subframe, the base station is The downlink emergency control channel of the next subframe of the downlink subframe sends control information to the terminal, that is, the terminal subframe is specifically configured to be configured (ie, the downlink basic structure is changed to the uplink emergency structure or the data transmission is switched from the downlink direction to the uplink direction). The normal terminal detects that there is no downlink data in its subframe 3 (ie, the sixth subframe in FIG. 14) and does not receive data. The emergency terminal detects that it transmits urgent uplink data in subframe 3 and transmits uplink emergency data in subframe 3. The terminal receives an ACK or NACK of the network device in the downlink emergency control channel of the next subframe. When the insertion interval is 5ms, the uplink emergency data delay is 15ms.

The uplink subframe needs to transmit downlink emergency data to a terminal, and the base station notifies the terminal of the current subframe configuration in the downlink emergency control channel of the next subframe (that is, the uplink basic structure changes to the downlink emergency structure or the data transmission is switched from the uplink direction to the downlink direction. Direction), transmitting downlink emergency data in the subframe data portion. The ordinary terminal does not detect the indication that the uplink data can be sent, and does not send the uplink data. The emergency terminal detects that the downlink emergency data is transmitted to itself on the traffic channel, and receives the downlink emergency data, and the emergency terminal returns an ACK or a NACK in the uplink control channel of the subframe. When the insertion interval is 5ms, the downlink emergency data delay is 10ms. In fact, the emergency data transmission ensures high reliability, and the transmission can be successfully performed in one time. After the uplink or downlink emergency data transmission, the transmitting end will pay attention to the ACK and NACK information of the receiving end.

On the other hand, the modified subframe of the TD-LTE system of the embodiment corresponding to the embodiment of FIG. 14 (subframe length 5 ms) may include a plurality of sub-traffic channels in the traffic channel, and the plurality of service sub-channels may be downlink emergency of the subframe. The control channel is set to a different information transmission direction, and the uplink data and the downlink data can be transmitted in one subframe. Similarly, the subframe header (the first OFDM symbol) of each subframe sets the downlink emergency control channel, and the uplink request channel is set at the end of the subframe (the last OFDM symbol) of each subframe. In this case, the uplink emergency data delay is 15 ms, and the downlink emergency data delay is 10 ms.

It should be understood that if the frame is not improved, in a subframe, the terminal and the base station need to transmit data (emergency data or normal data) different from the default information transmission mode of the subframe, and must wait until the appropriate information is obtained. In the subframe of the transmission mode, the transmission waiting time of the uplink and downlink data is long, and obviously the delay is also long.

对应一次性传输紧急数据成功和紧急数据经过两次传输传输成功的时延如下表1所示，表1中还列出当改变子帧结构设计的参数，使overhead为上述例子中的两倍的时候，对应一次性传输紧急数据成功和紧急数据经过两次传输传输成功的时延。The delay is related to the insertion density of the uplink and downlink control channels. Under the above parameter settings, the overhead is

The delays for successful transmission of one-time transmission of urgent data and successful transmission of urgent data by two transmissions are shown in Table 1 below. Table 1 also lists the parameters of the sub-frame structure design, so that the overhead is twice that of the above example. At the same time, it corresponds to the one-time transmission of emergency data success and the delay of successful transmission of the urgent data through two transmissions.

Table 1

Setting the uplink request channel to the second to last orthogonal frequency division multiplexed OFDM symbol of the subframe can reduce the delay of the uplink data (especially emergency data). For example, a system frame of TD-LTE corresponding to FIG. 8 is taken as an example. In another embodiment, for the improvement of such a system frame, refer to the corresponding embodiment in FIG. 8 above, except that each is different. In the subframe, the uplink request channel is located in the penultimate orthogonal frequency division multiplexing OFDM symbol of the subframe, and the downlink emergency control channel is still located in the first orthogonal frequency division multiplexing OFDM symbol of the subframe (symbol ). In this scheme, in a downlink subframe, a terminal generates uplink urgent data that needs to be sent to the base station, and the terminal sends request information in an uplink request channel of the downlink subframe, because the uplink request channel of the downlink subframe And the downlink emergency control channel of the next subframe of the downlink subframe is separated by at least one OFDM symbol, and the base station may receive the request information sent by the terminal during the period, so that the base station can be under the downlink subframe. A subframe downlink emergency control channel notifies the terminal to upload the uplink emergency data in the next subframe, where the next subframe is originally a downlink subframe (for example, notifying the terminal that the downlink subframe is switched from the downlink transmission to the uplink transmission, And configuring a corresponding guard interval), and receiving the emergency data uploaded by the emergency terminal in the traffic channel of the next subframe. The ordinary terminal detects the normal data that it wants to receive and does not receive the data. The emergency terminal detects that it can send emergency uplink data and transmit uplink emergency data on the traffic channel. If the subframe length is 5 ms, each subframe has an uplink request channel and a downlink emergency control channel, and the uplink emergency data delay is 10 ms.

Similarly, in an uplink subframe, the base station obtains downlink emergency data that needs to be sent to the terminal, and the default configuration of the next subframe of the uplink subframe is an uplink subframe, and the base station is in the downlink emergency of the next subframe. The control channel sends control information, for example, notifying the terminal that the uplink subframe is switched from the uplink transmission to the downlink transmission, and configuring the corresponding guard interval, and transmitting the downlink emergency data in the traffic channel of the next subframe. If the subframe length is 5ms, each subframe has a downlink emergency control channel. The downlink emergency data delay is 10ms. That is to say, this case is equal to the delay of the downlink emergency data of the subframe structure corresponding to FIG.

It can be seen that this implementation does not change the density of the entire uplink and downlink control channel insertion, and the overhead does not change. Since the uplink control and the downlink control are separated by one OFDM symbol, after the uplink request channel of one subframe transmits the uplink emergency request, the base station has time to complete the downlink-to-uplink handover and handle the uplink emergency after waiting for one subframe. The request can send the control information of the next subframe and the emergency data sent by the terminal in the subframe, and saves the delay of one subframe of the uplink emergency data compared with the embodiment corresponding to FIG. 8. The delay of successful transmission of emergency data and the success of emergency data transmission over two transmissions is shown in Table 2 below. Table 2 also lists the parameters when the sub-frame structure design is changed to make the overhead double. Severe transmission of emergency data success and emergency data transmission delays after two transmissions.

Table 2

A network device 1500 according to an embodiment of the present invention is described below with reference to FIG. The network device 1500 can be used to perform any of the above-described embodiments corresponding to FIG. 5 to FIG. The network device 1500 is configured to transmit information in multiple subframes in a time division duplex TDD communication system, where the time division duplex TDD communication system includes a network device and a terminal, where the multiple subframes include a first subframe, and the first subframe The first service channel and the first uplink request channel are included, and the network device 1500 includes: a data transmission module 1501, where the data transmission module 1501 is configured to transmit data to the terminal by using the first traffic channel;

The request receiving module 1502 is configured to receive the report information of the terminal by using the first uplink request channel, where the report information is a data transmission request of the second service, data of the third service, and feedback of the preset emergency command. At least one of the messages, the second service and the third service are preset emergency services.

In this way, the request, the data, and the feedback message of the preset emergency command are reported to the network device by using the first uplink request channel, and the service channel and the uplink request channel are provided in one subframe for emergency service and emergency. The feedback message of the instruction reserves resources, so that the reported information can be reported in a timely and flexible manner, without waiting for the data being transmitted to be transmitted, and transmitting in a suitable subframe in the transmission direction, thereby reducing the time of the part. Delaying the transmission waiting time of the higher reported information, thereby reducing the delay of this part of the information.

. In an implementation manner, the first subframe is a downlink subframe, the first subframe further includes a first interval, and the first interval is adjacent to the first uplink request channel, where In the first interval, the network device stops communicating with the terminal, and the data transmission module 1501 is configured to: the network device, in terms of transmitting data of the first service by using the first service channel and the terminal. Transmitting, by the first traffic channel, data of the first service to the terminal. In this way, the first interval can prevent the data transmitted by the network device and the terminal in the first subframe from being in the cell where the network device is located. Other terminal interference.

In an implementation manner, the multiple subframes further include a second subframe, where the second subframe is after the first subframe, and the reporting information includes a data transmission request of the second service, where The second subframe includes a second downlink emergency control channel and a second traffic channel, and the network device further includes a transmission control module 1503, where the transmission control module 1503 is configured to: according to the data transmission request of the second service, The second downlink emergency control channel sends the second control information to the terminal, where the second control information is used to indicate that the information transmission manner between the network device and the terminal is in the second service channel. The data transmission module 1501 is further configured to receive, by using the second traffic channel, data of the second service sent by the terminal.

In an implementation manner, the transmission control module 1503 is further configured to send data to the terminal by using the second downlink emergency control channel. In this way, the downlink emergency control channel can also be used to transmit data, making full use of the channel resources of the subframe, so that the time for transmitting data in one subframe is as long as possible.

In an implementation manner, the multiple subframes further include a third subframe, where the third subframe includes a third downlink emergency channel, a third traffic channel, and a third uplink request channel, where the third downlink emergency channel Before the third traffic channel and the third uplink request channel, the transmission control module 1503 is further configured to send third control information to the terminal by using the third downlink emergency control channel, where the third control The information is used to indicate the information transmission mode between the network device and the terminal in the third sub-service channel, where the information transmission mode is uplink transmission or downlink transmission; the data transmission module 1501 is further configured to pass The third service channel is configured to communicate with the terminal by using the information transmission manner; the request receiving module 1502 is further configured to receive the report information of the terminal by using the third uplink request channel, where the report information is At least one of a data transmission request of the fourth service, data of the fifth service, and a feedback message of the preset emergency instruction, the fourth service and the fifth Service is a preset emergency service, the third channel is only uplink request for transmitting the reporting information.

In summary, by adding a downlink emergency control channel and an uplink request channel in a subframe, the control of data transmission under the TDD protocol is enhanced, the transmission waiting time of a part of information is reduced, and the delay of the information is reduced, thereby making The frame structure in the TDD communication system is more flexible and more suitable for transmitting urgent data. Further, considering the hardware processing characteristics of the network device and the terminal in the process of transmitting and receiving data, the downlink emergency control channel and the location of the uplink request channel are reasonably designed to further reduce the information waiting time. Moreover, in the case of transmitting emergency data, the protection interval is added, which improves the accuracy of data transmission, and is more in line with the requirements of low-latency and high-accuracy of emergency data transmission.

It should be understood that the modules mentioned in the corresponding embodiment of FIG. 15 are only a functional distinction, and may have mutually overlapping or overlapping portions. In actual products, the network device may also include other software and hardware modules. . For example, the transmission control module 1503 is mainly to send a message, the request receiving module 1502 mainly receives the request, and the data transmission module 1501 can send and receive data, and in the actual product, the data and the message can be sent and received by using the same set of hardware or modules. Then, the device corresponding to the data transmission module 1501 may be the device corresponding to the request receiving module 1502 and the transmission control module 1503. In an implementation manner, the sending and receiving functions in the request receiving module 1502, the transmission control module 1503, and the data transmission module 1501 may be implemented by a communication interface, such as a transceiver. In the case that the network device is a base station, the hardware may correspond. The transceiver station of the base station. In the case where the network device is a router, a gateway, or a server, the hardware may correspond to a radio frequency circuit, including a device such as an antenna. The implementation manner of the request receiving module 1502, the transmission control module 1503, and the data transmission module 1501 is not limited in the embodiment of the present invention.

A terminal 1600 according to an embodiment of the present invention will be described below with reference to FIG. The terminal 1600 can be used to perform the above 4 to 14 correspond to any one of the embodiments. The terminal is configured to transmit information by using a plurality of subframes in a time division duplex TDD communication system, where the multiple subframes include a first subframe, where the first subframe includes a first traffic channel and a first uplink request channel, The terminal includes: a data transmission module 1601, configured to transmit data of the first service with the network device by using the first service channel, and a request reporting module 1602, configured to send, by using the first uplink request channel, the network device And sending the report information, where the report information is at least one of a data transmission request of the second service, data of the third service, and a feedback message of the preset emergency command, where the second service and the third service are pre- Emergency business. In this way, the request, the data, and the feedback message of the preset emergency command are reported to the network device by using the first uplink request channel, and the service channel and the uplink request channel are provided in one subframe for emergency service and emergency. The feedback message of the instruction reserves resources, so that the reported information can be reported in a timely and flexible manner, without waiting for the data being transmitted to be transmitted, and transmitting in a suitable subframe in the transmission direction, thereby reducing the time of the part. Delaying the transmission waiting time of the higher reported information, thereby reducing the delay of reporting the partial information.

In an implementation manner, the first subframe is a downlink subframe, the first subframe further includes a first interval, and the first interval is adjacent to the first uplink request channel, where In the first interval, the network device stops communicating with the terminal, and transmits data of the first service to the network device by using the first service channel, where the data transmission module 1601 is configured to pass the first service. The channel receives data of the first service sent by the network device. In this way, the first interval can prevent the data transmitted by the network device and the terminal in the first subframe from being interfered by other terminals in the cell where the network device is located.

In an implementation manner, the multiple subframes further include a second subframe, where the second subframe is after the first subframe, and the reporting information includes a data transmission request of the second service, where The second subframe includes a second downlink emergency control channel and a second traffic channel, the terminal further includes a control receiving module 1603, and the control receiving module 1603 is configured to receive second control information from the network device, The second control information is used to indicate that the information transmission manner between the network device and the terminal is uplink transmission in the second traffic channel, and the data transmission module 1601 is further configured to use the second traffic channel. And reporting data of the second service to the network device.

In an implementation manner, the control receiving module 1603 is further configured to receive data from the network device by using the second downlink emergency control channel. In this way, the downlink emergency control channel can also be used to transmit data, making full use of the channel resources of the subframe, so that the time for transmitting data in one subframe is as long as possible.

In an implementation manner, the multiple subframes further include a third subframe, where the third subframe includes a third downlink emergency channel, a third traffic channel, and a third uplink request channel, where the third downlink emergency channel Before the third traffic channel and the third uplink request channel, the control receiving module 1603 is further configured to receive, by using the third downlink emergency control channel, third control information from the network device, where The third control information is used to indicate an information transmission manner between the network device and the terminal in the third service channel, where the information transmission mode is uplink transmission or downlink transmission;

The data transmission module 1601 is further configured to communicate with the terminal by using the information transmission manner by using the third service channel; the request reporting module 1602 is further configured to use the third uplink request channel to provide The network device sends the report information, where the report information is at least one of a data transmission request of the fourth service, data of the fifth service, and a feedback message of the preset emergency command, the fourth service and the fifth The service is a preset emergency service, and the third uplink request channel is only used to transmit the reported information.

For the first subframe that is transmitted between the network device described in the foregoing embodiment of FIG. 15 and the terminal that is described in the embodiment of FIG. 16, in an implementation manner, the first uplink request channel is The second to last orthogonal frequency division multiplexed OFDM symbol of the first subframe. In this way, if the terminal requests the emergency data to be reported to the network device in the first uplink request channel, the network device can notify the terminal in the next subframe of the first subframe, and the next subframe can be The data is reported, thereby reducing the delay of reporting data by the terminal.

For the first subframe transmitted between the network device described in the foregoing embodiment of FIG. 15 and the terminal described in the embodiment corresponding to FIG. 16, in an implementation manner, the first uplink request channel is only used. Transmitting the reported information. In this way, it is ensured that the reported information has a dedicated channel transmission and is not occupied by the ordinary data. Since the reported information is information related to the emergency service and the emergency instruction, the transmission of the reported information is ensured, and the transmission waiting time of the reported information is reduced. , thereby reducing the delay of reporting information.

For the first subframe transmitted between the network device described in the foregoing embodiment of FIG. 15 and the terminal described in the embodiment corresponding to FIG. 16, in an implementation manner, the second subframe further includes The second interval is located between the second traffic channel and the second downlink emergency control channel, and in the second interval, the network device stops communicating with the terminal. In one implementation, the second interval is before the traffic channel and adjacent to the traffic channel. The second interval may prevent the data transmitted by the network device and the terminal in the first subframe from being interfered by other terminals in the cell where the network device is located.

And, in the subframe transmitted between the network device described in the embodiment corresponding to FIG. 15 and the terminal described in the embodiment corresponding to FIG. 16, the downlink emergency control channel is provided, and the network device and the terminal transmit data more flexibly. If necessary, the data transmission mode can be negotiated with the terminal on each subframe side of the network. This role is especially important during emergency data transmission because normal data is transmitted according to the default data transmission status specified in the protocol. In the process of transmission of ordinary data, sudden emergency data that is different from the normal data flow needs to be transmitted. The network side must notify the terminal of the configuration change of the current transmission unit on the downlink emergency control channel in advance to coordinate emergency data and normal data transmission. The downlink emergency control channel may also be used for the network side terminal to send an ACK (Acknowledgement)/NACK (Negative Acknowledgment) corresponding to the uplink transmission process of the previous subframe.

And, in one case, the control information in the first subframe transmitted between the network device described in the embodiment corresponding to FIG. 15 and the terminal described in the embodiment corresponding to FIG. 16 can control a plurality of consecutive subframes. The way information is transmitted. The control information is used to indicate an information transmission manner of a traffic channel in the first subframe and a traffic channel in at least one subframe subsequent to the first subframe. In this case, the next at least one subframe after the first subframe is at least one consecutive subframe after the subframe, and one subframe and the first subframe in the at least one consecutive subframe The frames are adjacent. In this case, the downlink emergency control channel is not required in at least one subsequent subframe of the first subframe. Therefore, the control is more flexible, and the utilization of the data transmitted by the subframe is improved, and the overhead of the subframe is reduced.

And, in an implementation manner, the third subframe transmitted between the network device described in the embodiment corresponding to FIG. 15 and the terminal described in the embodiment corresponding to FIG. 16, the third subframe The three uplink request channel is a penultimate orthogonal frequency division multiplexed OFDM symbol of the third subframe. In this way, the terminal and the network device can be prepared in the time of the last OFDM symbol of the second subframe, so that the terminal can report the data in the subsequent subframe of the third subframe, further reducing the reported data. Delay.

In summary, by adding a downlink emergency control channel and an uplink request channel in a subframe, the control of data transmission under the TDD protocol is enhanced, the data transmission waiting time is reduced, and the data delay is reduced, so that the TDD communication system is implemented. The frame structure in the frame is more flexible and more suitable for transmitting urgent data. Further, considering the hardware processing characteristics of the network device and the terminal in the process of transmitting and receiving data, the downlink emergency control channel and the location of the uplink request channel are reasonably designed to further reduce the delay of the data. Moreover, in the case of transmitting emergency data, the protection interval is added, which improves the accuracy of data transmission, and is more in line with the requirements of low-latency and high-accuracy of emergency data transmission.

It should be understood that the modules mentioned in the corresponding embodiment of FIG. 16 are only a functional distinction, and there may be mutual mutual The phase includes or overlaps. In the actual product, the terminal may also include other hardware and software modules. For example, the control receiving module 1603 mainly receives the message, the request reporting module 1602 mainly sends information, and the data transmission module 1601 can send and receive data, and in the actual product, the data and the message can be sent and received by using the same set of hardware or modules. That is, the device corresponding to the data transmission module 1601 may be the device corresponding to the control receiving module 1603 and the request reporting module 1602. In an implementation manner, the sending and receiving functions in the control receiving module 1603, the request reporting module 1602, and the data transmission module 1601 may be implemented by a communication interface, such as a transceiver, for example, a program in the modem of the terminal controls the radio frequency circuit. (including devices such as antennas). The implementation manner of the control receiving module 1603, the request reporting module 1602, and the data transmission module 1601 is not limited in the embodiment of the present invention.

For the related content of the network device described in the embodiment corresponding to FIG. 15 and the terminal described in the embodiment corresponding to FIG. 16 and the subframes transmitted between the two, refer to the foregoing description of the specification, and no longer Narration.

The embodiment of the invention further provides an apparatus to implement the method in the foregoing method embodiments. A schematic structural view of the device is shown in FIG. It should be understood that the schematic diagram shown in FIG. 17 can be applied to the network device in the method, and can also be applied to the terminal in the above method. The apparatus is configured to transmit information in a plurality of subframes in a time division duplex TDD communication system, the time division duplex TDD communication system including the network device and a terminal, the plurality of subframes including a first subframe, the first The subframe includes a first traffic channel and a first uplink request channel. The apparatus includes a processing circuit 1702, and a communication interface 1704 coupled thereto. In some cases, storage medium 1706 can also be included.

Among them, the processing circuit 1702 is used to process data, control data access and storage, issue commands, and control other devices to perform operations. Processing circuitry 1702 can be implemented as one or more processors, one or more controllers, and/or other structures that can be used to execute programs and the like. Processing circuit 1702 may specifically include at least one of a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic component. It should be understood that where processing circuit 302 is an application specific integrated circuit (ASIC), field programmable gate array (FPGA), or other programmable logic component, storage medium 1704 can be integrated with processing circuit 1702. A general purpose processor may include a microprocessor, as well as any conventional processor, controller, microcontroller, or state machine. Processing circuit 1702 can also be implemented as a computing component, such as a combination of a DSP and a microprocessor.

In one implementation, the device 1700 is an intelligent terminal, such as a mobile phone, and the processing circuit of the terminal includes an application processor 1709 and a transmission processor 1710.

It should be understood that FIG. 17 is only a schematic diagram of an implementation in which the device has a storage medium (eg, a memory) independent of the processing circuit 1702, a storage medium and processing circuit 1702, and a communication interface 1704. Can be connected via the bus. For example, servers, cell phones, and the like are suitable for this case. However, it should be understood that in another implementation, the processing circuit 1702 is an application specific integrated circuit (ASIC), field programmable gate array (FPGA), or other programmable logic component. The storage medium may be integrated with the processing circuit 302, and is different from the one shown in the figure. For example, some routers, gateways, some devices in the power system, such as an electric meter, etc., may adopt such an implementation, and the embodiment of the present invention does not. limited.

The storage medium 1706 may include a computer readable storage medium such as a magnetic storage device (eg, a hard disk, a floppy disk, a magnetic strip), an optical storage medium (eg, a digital versatile disk (DVD)), a smart card, a flash memory device, a random access memory. (RAM), read only memory (ROM), programmable ROM (PROM), erasable PROM (EPROM), registers, and any combination thereof. Storage medium 1706 can be coupled to processing circuitry 1702 such that processing circuitry 1702 can read information and write information to storage medium 1706. In particular, storage medium 1706 can be integrated into processing circuit 1702, or storage medium 1706 and processing circuit 1702 can be separate.

Communication interface 1704 can include circuitry and/or programs to enable two-way communication between a user equipment and one or more wireless network devices (e.g., base stations, servers, etc.). For example, communication interface 1704 can be a transceiver, and the transceiver can include a set of devices having a receiving function (eg, including a set of interfaces, at least one of a set of antennas and receiving circuits 1716), and a set A device having a transmitting function (such as at least one of another set of interfaces, a set of antennas, and a transmitting circuit 1718); or a set of devices (such as a set of interfaces or a group of antennas) having both a receiving function and a transmitting function. In one implementation, communication interface 1704 can be coupled to one or more antennas (not shown in FIG. 17) and include at least one receiving circuit 1716 and/or at least one transmitting circuit 1718.

The device shown in FIG. 17 , in an implementation manner, may be a network device, and the network device may execute a program through the processing circuit 1702 to invoke the communication interface 1704 to implement the network device executed by the foregoing method embodiment of the present invention. method. It can be understood that the request receiving module 1502, the transmission control module 1503, and the data transmission module 1501 of the network device in the embodiment corresponding to FIG. 15 may be implemented by the processing circuit 302 invoking the communication interface 304. For details and technical effects of the method in the method embodiment of the present invention for the network device, please refer to the foregoing, and no further details are provided herein.

The device shown in FIG. 17 may also be a terminal, and the terminal may execute a program through the processing circuit 1702 to invoke the communication interface 1704 to implement the method performed by the terminal in the foregoing method embodiment of the present invention. It can be understood that the control receiving module 1603, the request reporting module 1602, and the data transmission module 1601 of the terminal in the embodiment corresponding to FIG. 16 may be implemented by the processing circuit 1702 invoking the communication interface 1704. For details and technical effects of the method in the embodiment of the method of the present invention for the terminal, please refer to the foregoing, and no further details are provided herein.

The method, the network device, and the terminal for transmitting information provided by the embodiments of the present invention are described in detail. Various embodiments are used herein to explain the principles and implementations of the present invention, and at the same time, those skilled in the art The present invention is not limited by the scope of the present invention.

Claims (34)

An information transmission method for transmitting information through a plurality of subframes in a time division duplex TDD communication system, the time division duplex TDD communication system including a network device and a terminal, wherein the plurality of subframes The first subframe includes a first traffic channel and a first uplink request channel, and the transmission method includes: Transmitting, by the network device, data to the terminal by using the first traffic channel; The network device receives the report information of the terminal by using the first uplink request channel, where the report information is a data transmission request of the second service, data of the third service, and a feedback message of the preset emergency command. At least one of the second service and the third service is a preset emergency service. The method according to claim 1, wherein the first subframe is a downlink subframe, and the first interval is adjacent to the first uplink request channel, and the first subframe further includes a first interval. And the first interval is adjacent to the first uplink request channel, in the first interval, the network device stops communicating with the terminal, and the network device passes the first traffic channel and the The terminal transmits data of the first service, including: The network device sends data of the first service to the terminal by using the first service channel. The method according to claim 1 or 2, wherein the first uplink request channel is a penultimate orthogonal frequency division multiplexed OFDM symbol of the first subframe. The method according to any one of claims 1 to 3, wherein the first uplink request channel is only used to transmit the reported information. The method according to any one of claims 1 to 4, wherein the plurality of subframes further comprise a second subframe, and the second subframe is after the first subframe, the reporting information The data transmission request includes the second service, where the second subframe includes a second downlink emergency control channel and a second traffic channel, and the method further includes: The network device sends second control information to the terminal by using the second downlink emergency control channel according to the data transmission request of the second service, where the second control information is used to indicate the second service channel. The information transmission manner between the network device and the terminal is uplink transmission; Receiving, by the network device, data of the second service sent by the terminal by using the second service channel. The method according to claim 5, wherein the second subframe further comprises a second interval, the second interval being located between the second traffic channel and the second downlink emergency control channel, In the second interval, the network device stops communicating with the terminal. The method according to any one of claims 5 or 6, wherein the method further comprises: the network device transmitting data to the terminal through the second downlink emergency control channel. The method according to any one of claims 1 to 7, wherein the plurality of subframes further comprise a third subframe, and the third subframe comprises a third downlink emergency channel, a third traffic channel, and a third The third uplink request channel, the third downlink emergency channel is before the third traffic channel and the third uplink request channel, and the method includes: Transmitting, by the network device, third control information to the terminal by using the third downlink emergency control channel, where the third control information is used to indicate that the network device and the terminal are in the third sub-service channel In the information transmission mode, the information transmission mode is uplink transmission or downlink transmission; The network device communicates with the terminal by using the information transmission manner by using the third service channel; The network device receives the report information of the terminal by using the third uplink request channel, where the report information is a data transmission request of the fourth service, data of the fifth service, and a feedback message of the preset emergency command. At least one of the fourth service and the fifth service is a preset emergency service, and the third uplink request channel is only used to transmit the report information. An information transmission method for transmitting information through a plurality of subframes in a time division duplex TDD communication system, the time division duplex TDD communication system including a network device and a terminal, wherein the plurality of subframes The first subframe includes a first traffic channel and a first uplink request channel, and the transmission method includes: Transmitting, by the terminal, data of the first service to the network device by using the first service channel; Sending, by the terminal, the report information to the network device by using the first uplink request channel, where the report information is a data transmission request of the second service, data of the third service, and a feedback message of the preset emergency command. At least one of the second service and the third service is a preset emergency service. The method according to claim 9, wherein the first subframe is a downlink subframe, and the first interval is adjacent to the first uplink request channel, and the first subframe further includes a first interval. And the first interval is adjacent to the first uplink request channel, in the first interval, the network device stops communicating with the terminal, and the terminal passes the first traffic channel and the The network device transmits data of the first service, including: The terminal receives data of the first service sent by the network device by using the first service channel. The method according to claim 9 or 10, wherein the first uplink request channel is a penultimate orthogonal frequency division multiplexed OFDM symbol of the first subframe. The method according to any one of claims 9 to 11, wherein the first uplink request channel is only used to transmit the reported information. The method according to any one of claims 9 to 12, wherein the plurality of subframes further comprise a second subframe, and the second subframe is after the first subframe, the reporting information The data transmission request includes the second service, where the second subframe includes a second downlink emergency control channel and a second traffic channel, and the method further includes: The terminal receives the second control information from the network device, where the second control information is used to indicate that the information transmission mode between the network device and the terminal is uplink transmission in the second service channel. ; The terminal reports the data of the second service to the network device by using the second service channel. The method according to claim 13, wherein the second subframe further comprises a second interval, the second interval being located between the second traffic channel and the second downlink emergency control channel, In the second interval, the network device stops communicating with the terminal. The method according to any one of claims 13 or 14, wherein the method further comprises: the terminal receiving data from the network device through the second downlink emergency control channel. The method according to any one of claims 9 to 15, wherein the plurality of subframes further comprise a third subframe, and the third subframe comprises a third downlink emergency channel, a third traffic channel, and a third The third uplink request channel, the third downlink emergency channel is before the third traffic channel and the third uplink request channel, and the method includes: The terminal receives third control information from the network device by using the third downlink emergency control channel, where the third control information is used to indicate that the network device and the terminal are in the third service channel. In the information transmission mode, the information transmission mode is uplink transmission or downlink transmission; The terminal communicates with the terminal by using the information transmission manner by using the third service channel; The terminal sends the report information to the network device by using the third uplink request channel, where the report information is a data transmission request of the fourth service, data of the fifth service, and a feedback message of the preset emergency command. At least one of the fourth service and the fifth service is a preset emergency service, and the third uplink request channel is only used to transmit the report information. A network device for transmitting information through a plurality of subframes in a time division duplex TDD communication system, the time division duplex TDD communication system including a network device and the terminal, wherein the plurality of sub Frame includes first a subframe, the first subframe includes a first traffic channel and a first uplink request channel, and the network device includes: a data transmission module, configured to transmit data to the terminal by using the first traffic channel; The request receiving module is configured to receive, by using the first uplink request channel, the report information of the terminal, where the report information is a data transmission request of the second service, data of the third service, and a feedback message of the preset emergency command. At least one of the second service and the third service is a preset emergency service. The network device according to claim 17, wherein the first subframe is a downlink subframe, and the first interval is adjacent to the first uplink request channel, and the first subframe further includes a first subframe. Interval, and the first interval is adjacent to the first uplink request channel, in the first interval, the network device stops communicating with the terminal, and passes through the first traffic channel and the terminal And an aspect of transmitting the data of the first service, where the data transmission module is configured to: send, by the network device, data of the first service to the terminal by using the first service channel. The network device according to claim 17 or 18, wherein the first uplink request channel is a penultimate orthogonal frequency division multiplexed OFDM symbol of the first subframe. The network device according to any one of claims 17 to 19, wherein the first uplink request channel is used only for transmitting the report information. The network device according to any one of claims 17 to 20, wherein the plurality of subframes further include a second subframe, and the second subframe is after the first subframe, the reporting The information includes a data transmission request of the second service, the second subframe includes a second downlink emergency control channel and a second traffic channel, and the network device further includes a transmission control module, where the transmission control module is configured to use a second data transmission request, where the second downlink emergency control channel sends second control information to the terminal, where the second control information is used to indicate that the network device is in the second service channel The information transmission manner with the terminal is uplink transmission; The data transmission module is further configured to receive data of the second service sent by the terminal by using the second service channel. The network device according to claim 21, wherein the second subframe further comprises a second interval, the second interval being located between the second traffic channel and the second downlink emergency control channel, Within the second interval, the network device stops communicating with the terminal. The network device according to any one of claims 21 or 22, wherein the transmission control module is further configured to send data to the terminal by using the second downlink emergency control channel. The network device according to any one of claims 17 to 23, wherein the plurality of subframes further comprise a third subframe, and the third subframe comprises a third downlink emergency channel, a third traffic channel, and a third uplink request channel, where the third downlink emergency channel is before the third traffic channel and the third uplink request channel, the transmission control module is further configured to use the third downlink emergency control channel to The terminal sends the third control information, where the third control information is used to indicate the information transmission mode between the network device and the terminal in the third sub-service channel, where the information transmission mode is uplink transmission or downlink transmission; The data transmission module is further configured to communicate with the terminal by using the information transmission manner by using the third service channel; The request receiving module is further configured to receive the report information of the terminal by using the third uplink request channel, where the report information is a data transmission request of a fourth service, data of a fifth service, and a preset emergency command. At least one of the feedback messages, the fourth service and the fifth service are preset emergency services, and the third uplink request channel is only used to transmit the report information. A terminal for transmitting information through multiple subframes in a time division duplex TDD communication system, when The sub-duplex TDD communication system includes a network device and a terminal, where the multiple subframes include a first subframe, the first subframe includes a first traffic channel and a first uplink request channel, and the terminal includes: a data transmission module, configured to transmit data of the first service to the network device by using the first service channel; The request reporting module is configured to send, by using the first uplink request channel, report information to the network device, where the report information is a data transmission request of the second service, data of the third service, and feedback of the preset emergency command. At least one of the messages, the second service and the third service are preset emergency services. The terminal according to claim 25, wherein the first subframe is a downlink subframe, and the first interval is adjacent to the first uplink request channel, and the first subframe further includes a first interval. And the first interval is adjacent to the first uplink request channel, in the first interval, the network device stops communicating with the terminal, and passes the first traffic channel with the network device Transmitting data of the first service, where the data transmission module is configured to receive data of the first service sent by the network device by using the first service channel. The terminal according to claim 25 or 26, wherein the first uplink request channel is a penultimate orthogonal frequency division multiplexed OFDM symbol of the first subframe. The terminal according to any one of claims 25 to 27, wherein the first uplink request channel is used only for transmitting the report information. The terminal according to any one of claims 25 to 28, wherein the plurality of subframes further includes a second subframe, and the second subframe is after the first subframe, the reporting information Including a data transmission request of the second service, the second subframe includes a second downlink emergency control channel and a second traffic channel, The terminal further includes a control receiving module, the control receiving module is configured to receive second control information from the network device, and the second control information is used to indicate that the network device is in the second service channel The information transmission manner with the terminal is uplink transmission; The data transmission module is further configured to report data of the second service to the network device by using the second service channel. The terminal according to claim 29, wherein the second subframe further comprises a second interval, the second interval being located between the second traffic channel and the second downlink emergency control channel, In the second interval, the network device stops communicating with the terminal. The terminal according to any one of claims 29 or 30, wherein the control receiving module is further configured to receive data from the network device by using the second downlink emergency control channel. The terminal according to any one of claims 25 to 31, wherein the plurality of subframes further comprise a third subframe, the third subframe comprises a third downlink emergency channel, a third traffic channel, and a third a third uplink request channel, where the third downlink emergency channel is before the third traffic channel and the third uplink request channel, The control receiving module is further configured to receive third control information from the network device by using the third downlink emergency control channel, where the third control information is used to indicate that the network is in the third traffic channel. Information transmission mode between the device and the terminal, where the information transmission mode is uplink transmission or downlink transmission; The data transmission module is further configured to communicate with the terminal by using the information transmission manner by using the third service channel; The request reporting module is further configured to send the report information to the network device by using the third uplink request channel, where the report information is a data transmission request of the fourth service, data of the fifth service, and a preset emergency command. At least one of the feedback messages, the fourth service and the fifth service are preset emergency services, and the third uplink request channel is only used to transmit the report information. A network device for transmitting information through a plurality of subframes in a time division duplex TDD communication system, the time division duplex TDD communication system including the network device and a terminal, wherein the plurality of sub The frame includes a first subframe, the first subframe includes a first traffic channel and a first uplink request channel, the network device includes a processor and a transceiver, and the processor is configured to execute the claim by using the transceiver The method described in 1 to 8. A terminal for transmitting information in a plurality of subframes in a time division duplex TDD communication system, the time division duplex TDD communication system including a network device and the terminal, wherein the plurality of subframes includes a first subframe, the first subframe includes a first traffic channel and a first uplink request channel, the terminal includes a processor and a transceiver, and the processor is configured to perform the claims 9 to 16 through the transceiver Said method.

Images