WO2018054147A1 - Method and device for indicating and determining downlink control information format - Google Patents

Abstract

Disclosed in the present application are a method and a device for indicating and determining a downlink control information format. The method comprises: when the information bit length of downlink control information for a short transmission time interval is the same as that of downlink control information of a legacy subframe, an information domain carrying an indication that the downlink control information is the downlink control information of the legacy subframe or the downlink control information for the short transmission time interval; after receiving the downlink control information, determining, according to the indication, that the downlink control information is the downlink control information of the legacy subframe or the downlink control information for the short transmission time interval. The present application enables a terminal to distinguish same sized downlink control information of a legacy subframe and downlink control information for a short transmission time interval, and helps to reduce the number of blind tests of the terminal when short downlink control information is transmitted in a legacy control region.

Description

Method and device for indicating and determining downlink control information format

This application claims the priority of the Chinese patent application filed on September 26, 2016, the Chinese Patent Office, the application number is 201610851855.4, and the application name is “a method and device for indicating the format of the downlink control information”. The citations are incorporated herein by reference.

Technical field

The present application relates to the field of wireless communication technologies, and in particular, to a method and apparatus for indicating and determining a format of a downlink control information.

Background technique

The mobile Internet is subverting the traditional mobile communication business model, providing users with an unprecedented experience, which has a profound impact on all aspects of people's work and life. The mobile Internet will promote the further upgrade of human social information interaction methods, providing users with a richer business experience such as augmented reality, virtual reality, ultra high definition (3D) video, mobile cloud and so on. The further development of the mobile Internet will bring about a thousand times increase in mobile traffic in the future, and promote a new round of changes in mobile communication technologies and industries. The Internet of Things has expanded the range of services for mobile communications, from human-to-human communication to the intelligent interconnection of people and things, things and things, making mobile communication technology penetrate into a wider range of industries and fields. In the future, mobile medical, car networking, smart home, industrial control, environmental monitoring, etc. will promote the explosive growth of IoT applications, and hundreds of billions of devices will access the network to achieve a true “Internet of Everything”. At the same time, massive device connectivity and diverse IoT services will also bring new technical challenges to mobile communications.

As new business requirements continue to emerge and become more demanding, higher performance demands are placed on future mobile communication systems, such as higher peak rates, better user experience rates, smaller latency, and higher reliability. Higher spectral efficiency and higher energy efficiency, and need to support more user access and use various types of services. In order to support a large number of types of terminal connections and different types of services, the flexible configuration of uplink and downlink resources has become a major trend in technology development. Shortening the time domain length of the Transmission Time Interval (TTI) is a key method to reduce the data transmission delay.

FIG. 1 is a schematic diagram of a frame structure 1 used by an LTE FDD system. The existing Long Term Evolution (LTE) Frequency Division Duplex (FDD) system uses a frame structure (frame structure type 1, FS1), and its structure. As shown in Figure 1. In the FDD system, the uplink and downlink transmissions use different carrier frequencies, and both the uplink and downlink transmissions use the same frame structure. On each carrier, a 10ms-length radio frame contains 10 1ms subframes, each of which is divided into two 0.5ms long slots. The TTI duration of uplink and downlink data transmission is 1 ms.

2 is a schematic diagram of a frame structure 2 used in an LTE TDD system. The existing LTE TDD (Time Division Duplex) system uses a frame structure type 2 (FS2), as shown in FIG. 2 . In a TDD system, uplink and downlink transmissions use different subframes or different time slots on the same frequency. Each 10 ms radio frame in FS2 consists of two 5 ms half frames, each of which contains five subframes of 1 ms length. The sub-frames in FS2 are classified into three types: downlink sub-frames, uplink sub-frames, and special sub-frames. Each special sub-frame consists of Downlink Pilot Time Slot (DwPTS), Guard Period (GP), and Uplink Pilot Time Slot (UpPTS) is composed of three parts. The DwPTS can transmit downlink pilot, downlink service data and downlink control signaling; the GP does not transmit any signal; the UpPTS only transmits random access and Sounding Reference Symbol (SRS), and cannot transmit uplink service or uplink control information. Each field includes at least one downlink subframe and at least one uplink subframe, and at most one special subframe. Table 7 lists the seven uplink and downlink subframe configurations supported by FS2.

Table 1: Uplink-downlink configurations (upstream and downstream configurations)

PRB(physical resource block，物理资源块)是更大维度的资源单元，由

个RE组成。一个subframe(子帧)中有一个PRB pair(PRB对)，PRB pair是数据资源分配的基本单位。Figure 3 is a schematic diagram of a Downlink resource grid. As shown in the figure, in the existing LTE, the minimum resource granularity in the time domain is an OFDM (Orthogonal Frequency Division Multiplex) symbol. The upper minimum resource granularity is one subcarrier. (k, l) is the number of a basic RE (resource element). among them

PRB (physical resource block) is a resource unit of a larger dimension.

RE composition. There is a PRB pair in a subframe. The PRB pair is the basic unit of data resource allocation.

In the LTE system, downlink control information (DCI) is carried by a physical downlink control channel (PDCCH) for transmitting uplink/downlink scheduling information and related common control information. A variety of formats are defined depending on the information contained in the DCI. For example, DCI format0/4 is used for uplink data scheduling, DCI format1/1A/1B/1C/1D/2/2A/2B/2C is used for downlink data scheduling, and DCI for each format is for different transmission modes/uses, including The number of information bits is different, and the meaning of the information field is also different. The DCI contains most of the information required to schedule User Equipment (UE), such as resource allocation and modulation. Modulation and Coding Scheme (MCS), HARQ ID (HARQ ID; HARQ: Hybrid Automatic Repeat Request), New Data Indicator (NDI), and the like.

The terminal distinguishes different DCI formats according to different DCI sizes. For different DCI formats with the same DCI size, the display bit in the DCI is used to indicate which DCI format the DCI is.

However, the shortcoming of the prior art is that in some cases, the terminal cannot distinguish the DCI format according to the display bit indication in the DCI.

Summary of the invention

The present application provides a method and apparatus for indicating and determining a DCI format, which can distinguish between a traditional DCI format and a short TTI DCI format when control information of a short TTI is transmitted in a legacy control region.

A method for indicating a DCI format is provided in the embodiment of the present application, including:

Determining that the length of the DCI information bit of the short TTI is the same as the length of the DCI information bit of the legacy subframe;

Carrying an indication in an information field of a DCI of a legacy subframe and a DCI of a short TTI, where the indication is used to indicate that the DCI is a DCI of a legacy subframe or a DCI of a short TTI; or, using a different RNTI value for a legacy subframe The DCI is scrambled with the DCI of the short TTI.

Optionally, the DCI of the legacy subframe and the DCI of the short TTI are transmitted in the USS in the legacy control region.

Optionally, the length of the DCI of the short TTI is the same as the DCI format0/1A of the legacy subframe.

Optionally, the information field carrying the indication is located in a DCI of the short TTI and a specific information field of the information bit in the DCI format 0/1 A.

Optionally, the specific information field is a first information field in which all information bits of the DCI start from a low position;

Or the specific information field is a second information field in which all information bits of the DCI start from a low position;

Or, the specific information field is other specific locations of all information bits of the DCI except the first information domain and the second information domain.

Optionally, the information field carrying the indication includes 1 bit information.

Optionally, further comprising:

When the DCI of the short TTI is not transmitted in the legacy control region, and/or when the DCI of the short TTI is transmitted in the control region of the short TTI, the indication is not carried in the information field.

Optionally, the CRC of the DCI of the legacy subframe and the CRC of the DCI of the short TTI are scrambled using different RNTIs.

A method for determining a DCI format is provided in the embodiment of the present application, including:

After receiving the DCI, determining, according to the indication, that the DCI is a DCI of a legacy subframe or a DCI of a short TTI, where the information field of the DCI carries an indication, where the indication is used to indicate that the DCI is a legacy subframe. DCI of DCI or short TTI;

Or, after receiving the DCI, determining, according to different RNTI, the DCI is a DCI of a legacy subframe or a DCI of a short TTI;

The length of the DCI information bit of the short TTI is the same as the length of the DCI information bit of the legacy subframe.

Optionally, the DCI of the legacy subframe and the DCI of the short TTI are transmitted in the USS in the legacy control region.

Optionally, the length of the DCI of the short TTI is the same as the DCI format0/1A of the legacy subframe.

Optionally, the information field carrying the indication is located in a DCI of the short TTI and a specific information field of the information bit in the DCI format 0/1 A.

Optionally, the specific information field is a first information field in which all information bits of the DCI start from a low position;

Or the specific information field is a second information field in which all information bits of the DCI start from a low position;

Or, the specific information field is other specific locations of all information bits of the DCI except the first information domain and the second information domain.

Optionally, the information field carrying the indication includes 1 bit information.

Optionally, further comprising:

When the DCI of the short TTI is not transmitted in the legacy control region, and/or when the DCI of the short TTI is transmitted in the control region of the short TTI, the DCI format is not determined according to the indication.

Optionally, after the terminal receives the DCI, the DCI is classified into a DCI of a legacy subframe or a DCI of a short TTI according to a CRC scrambled by using different RNTIs.

An apparatus for indicating a DCI format is provided in the embodiment of the present application, including:

a determining module, configured to determine that a DCI information bit length of the short TTI is the same as a DCI information bit length of the legacy subframe;

An indication module, configured to carry an indication in an information field of a DCI of a legacy subframe and a DCI of a short TTI, where the indication is used to indicate that the DCI is a DCI of a legacy subframe or a DCI of a short TTI; or, use different RNTI values The DCI of the legacy subframe and the DCI of the short TTI are scrambled.

Optionally, the DCI of the legacy subframe and the DCI of the short TTI are transmitted in the USS in the legacy control region.

Optionally, the length of the DCI of the short TTI is the same as the DCI format0/1A of the legacy subframe.

Optionally, the indication module is further configured to carry the indication in a specific information domain of the information bit in the DCI of the short TTI and the DCI format 0/1 A.

Optionally, the specific information field is a first information field in which all information bits of the DCI start from a low position;

Or the specific information field is a second information field in which all information bits of the DCI start from a low position;

Or, the specific information field is other specific locations of all information bits of the DCI except the first information domain and the second information domain.

Optionally, the information field carrying the indication includes 1 bit information.

Optionally, the indication module is further configured to: when the DCI of the short TTI is not transmitted in the control area of the legacy, and/or when the DCI of the short TTI is transmitted in the control area of the short TTI, the indication is not carried in the information domain.

Optionally, the indication module is further configured to scramble the CRC of the DCI of the legacy subframe and the DCI of the short TTI by using different RNTIs.

An apparatus for determining a DCI format is provided in the embodiment of the present application, including:

a receiving module, configured to receive a DCI;

a distinguishing module, configured to determine, according to the indication, that the DCI is a DCI of a legacy subframe or a DCI of a short TTI, where the information field of the DCI carries an indication, where the indication is used to indicate the DCI a DCI of a legacy subframe or a DCI of a short TTI; or, after receiving the DCI, determining, according to different RNTI, the DCI is a DCI of a legacy subframe or a DCI of a short TTI;

The length of the DCI information bit of the short TTI is the same as the length of the DCI information bit of the legacy subframe.

Optionally, the DCI of the legacy subframe and the DCI of the short TTI are transmitted in the USS in the legacy control region.

Optionally, the length of the DCI of the short TTI is the same as the DCI format0/1A of the legacy subframe.

Optionally, the information field carrying the indication is located in a DCI of the short TTI and a specific information field of the information bit in the DCI format 0/1 A.

Optionally, the specific information field is a first information field in which all information bits of the DCI start from a low position;

Or the specific information field is a second information field in which all information bits of the DCI start from a low position;

Or, the specific information field is other specific locations of all information bits of the DCI except the first information domain and the second information domain.

Optionally, the information field carrying the indication includes 1 bit information.

Optionally, the distinguishing module is further configured to: when the DCI of the short TTI is not transmitted in the control area of the legacy, and/or when the DCI of the short TTI is transmitted in the control area of the short TTI, the DCI format is not determined according to the indication.

The distinguishing module is further configured to distinguish the DCI according to the CRC scrambled by using different RNTIs after receiving the DCI. The DCI of the legacy subframe or the DCI of the short TTI.

An apparatus for indicating a DCI format is provided in the embodiment of the present application, including:

A processor for reading a program in the memory, performing the following process:

After determining that the DCI information bit length of the short TTI is the same as the DCI information bit length of the legacy subframe, the indication is carried in the information field of the DCI of the legacy subframe and the DCI of the short TTI, where the indication is used to indicate that the DCI is legacy The DCI of the frame or the DCI of the short TTI; or, the DCI of the legacy subframe and the DCI of the short TTI are scrambled using different RNTI values.

A transceiver for receiving and transmitting data under the control of a processor.

Optionally, the DCI of the legacy subframe and the DCI of the short TTI are transmitted in the USS in the legacy control region.

Optionally, the length of the DCI of the short TTI is the same as the DCI format0/1A of the legacy subframe.

Optionally, the processor is further configured to carry the indication in a specific information domain of the information bit in the DCI of the short TTI and the DCI format 0/1 A.

Optionally, the specific information field is a first information field in which all information bits of the DCI start from a low position;

Or the specific information field is a second information field in which all information bits of the DCI start from a low position;

Or, the specific information field is other specific locations of all information bits of the DCI except the first information domain and the second information domain.

Optionally, the information field carrying the indication includes 1 bit information.

Optionally, the processor is further configured to: when the DCI of the short TTI is not transmitted in the control area of the legacy, and/or when the DCI of the short TTI is transmitted in the control area of the short TTI, do not carry the indication in the information domain.

Optionally, the processor is further configured to scramble the CRC of the DCI of the legacy subframe and the DCI of the short TTI by using different RNTIs.

An apparatus for determining a DCI format is provided in the embodiment of the present application, including:

A processor for reading a program in the memory, performing the following process:

After receiving the DCI, determining, according to the indication, that the DCI is a DCI of a legacy subframe or a DCI of a short TTI, where the information field of the DCI carries an indication, where the indication is used to indicate that the DCI is a legacy subframe. DCI of DCI or short TTI;

Or, after receiving the DCI, determining, according to different RNTI, the DCI is a DCI of a legacy subframe or a DCI of a short TTI;

The length of the DCI information bit of the short TTI is the same as the length of the DCI information bit of the legacy subframe.

A transceiver for receiving and transmitting data under the control of a processor.

Optionally, the DCI of the legacy subframe and the DCI of the short TTI are transmitted in the USS in the legacy control region.

Optionally, the length of the DCI of the short TTI is the same as the DCI format0/1A of the legacy subframe.

Optionally, the information field carrying the indication is located in a DCI of the short TTI and a specific information field of the information bit in the DCI format 0/1 A.

Optionally, the specific information field is a first information field in which all information bits of the DCI start from a low position;

Or the specific information field is a second information field in which all information bits of the DCI start from a low position;

Or, the specific information field is other specific locations of all information bits of the DCI except the first information domain and the second information domain.

Optionally, the information field carrying the indication includes 1 bit information.

Optionally, the processor is further configured to: when the DCI of the short TTI is not transmitted in the control area of the legacy, and/or when the DCI of the short TTI is transmitted in the control area of the short TTI, the DCI format is not determined according to the indication.

Optionally, the processor is further configured to: after receiving the DCI, distinguish the DCI from the DCI of the legacy subframe or the DCI of the short TTI according to the CRC scrambled by using different RNTIs.

The beneficial effects of the application are as follows:

In the technical solution provided by the embodiment of the present application, when determining that the DCI of the legacy subframe is consistent with the DCI length of the short TTI, the DCI or the short TTI indicating that the DCI is a legacy subframe is carried in the information domain. The indication enables the terminal to distinguish the DCI of the legacy subframe of the same size and the DCI of the short TTI according to the indication.

In another mode, the network side uses different RNTI (Radio Network Temporary Identifier) values to scramble the DCI of the legacy subframe and the DCI of the short TTI, so that the terminal side can also be based on different RNTIs. It is determined that the DCI is a DCI of a legacy subframe or a DCI of a short TTI.

Further, the technical solution provided by the embodiment of the present application can also help reduce the number of blind detections of the terminal when the short DCI is transmitted in the legacy control region, because the DCI of the legacy subframe of the same size and the DCI of the short TTI can be distinguished.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the present application, and are intended to be a part of this application. In the drawing:

1 is a schematic diagram of a frame structure 1 used by an LTE FDD system in the background art;

2 is a schematic diagram of a frame structure 2 used by the LTE TDD system in the background art;

3 is a schematic diagram of a Downlink resource grid in the background art;

4 is a schematic flowchart of a method for implementing a method for indicating a DCI format on a network side according to an embodiment of the present application;

FIG. 5 is a schematic flowchart of a method for determining a DCI format on a terminal side according to an embodiment of the present application;

FIG. 6 is a schematic structural diagram of an apparatus for indicating a DCI format on a network side according to an embodiment of the present application;

FIG. 7 is a schematic structural diagram of an apparatus for determining a DCI format on a terminal side according to an embodiment of the present application;

FIG. 8 is a schematic structural diagram of a base station according to an embodiment of the present application;

FIG. 9 is a schematic structural diagram of a terminal in an embodiment of the present application.

detailed description

With the development of mobile technology, future mobile communication systems need to provide lower network delay and support a wider variety of services. A TTI length shorter than 1 ms can bring about an increase in throughput and a decrease in transmission time, and has become a hot spot of current research. The inventor noticed during the invention:

In the existing LTE system, different DCI formats generally have different sizes, so the terminal can use the bit length to distinguish different DCI formats, thereby determining the resolution of each information domain in the DCI. For DCI format0/1A, since the bit lengths of the two are the same, it is necessary to distinguish them by using Flag for format0/format1A differentiation (differential flag of format 0/1A). However, when the control information of the short TTI is transmitted in the legacy control region and the bit length is the same as the bit length of the DCI of the legacy subframe, the terminal cannot determine whether the DCI is a legacy subframe DCI or a short TTI DCI, which may be erroneous. The information field in the DCI is parsed, resulting in failure to receive or transmit data correctly.

That is, when the control information of the short TTI is transmitted in the legacy control region, there is currently no clear scheme capable of distinguishing between the legacy subframe DCI format and the short TTI DCI format. Based on this, a scheme for distinguishing the traditional subframe DCI format from the short TTI DCI format is proposed in the embodiment of the present application. The specific embodiments of the present application will be described below with reference to the accompanying drawings.

In the description process, the implementations from the base station side and the terminal side will be respectively explained, and then an example in which the two are implemented together will be given to better understand the implementation of the solution given in the embodiment of the present application. However, such an explanation does not mean that the two must be implemented together or must be implemented separately. In fact, when the terminal is separately implemented from the base station, it also solves the problems on the terminal side and the base station side, and when the two are combined, Will get better technical results.

It should be noted that since the behaviors of the base station side and the terminal side generally correspond to each other, the description will be made on one side for the sake of brevity, but this does not mean that the other side not illustrated has no corresponding implementation. Those skilled in the art should be able to understand the implementation of the corresponding side based on common knowledge.

4 is a schematic flowchart of a method for implementing a method for indicating a DCI format on a network side, as shown in the figure, which may include:

Step 401: Determine that the length of the DCI information bit of the short TTI is the same as the length of the DCI information bit of the legacy subframe.

Step 402: Carry an indication in an information domain of a DCI of a legacy subframe and a DCI of a short TTI, where the indication is used for Indicates that the DCI is a DCI of a legacy subframe or a DCI of a short TTI; or, the DCI of the legacy subframe and the DCI of the short TTI are scrambled using different RNTI values.

5 is a schematic flowchart of a method for determining a DCI format on a terminal side. As shown in the figure, when the length of the DCI information bit of the short TTI is the same as the length of the DCI information bit of the legacy subframe, the following may include:

Step 501: Receive a DCI.

Step 502: After receiving the DCI, determine, according to the indication, that the DCI is a legacy subframe DCI or a short TTI DCI, where the information field of the DCI carries an indication, where the indication is used to indicate that the DCI is legacy The DCI of the frame DCI or the short TTI; or, after receiving the DCI, determines whether the DCI is a DCI of a legacy subframe or a DCI of a short TTI according to different RNTIs.

Specifically, the specific information field in the DCI may be used to add a DCI type indication field at a specific position of the DCI information bit, to indicate that the DCI is a DCI of a legacy subframe or a DCI of a short TTI.

In implementation, the DCI of the legacy subframe and the DCI of the short TTI are transmitted in a UE-specific search space (USS) in a legacy control region.

Specifically, the DCI of the legacy legacy subframe and the DCI of the short TTI are simultaneously transmitted in the USS in the legacy control region.

In implementation, the length of the DCI of the short TTI is the same as the DCI format0/1A of the legacy subframe.

In an implementation, the information field carrying the indication is located in a DCI of a short TTI and a specific information field of an information bit in DCI format0/10/1.

In a specific implementation, the specific information field is a first information field in which all information bits of the DCI start from a low position;

Or the specific information field is a second information field in which all information bits of the DCI start from a low position;

Or, the specific information field is other specific locations of all information bits of the DCI except the first information domain and the second information domain.

Specifically, the DCI type indication domain may be located in a specific information domain of the information bit in the DCI.

The specific information field refers to the first information field in which all information bits of the DCI start from the lower bit. For example, all the information bits in the DCI are from low to high, a0, a1, ..., aN, and the first information field is represented by a0. Bit information;

The specific information field refers to a second information field in which all information bits of the DCI start from a lower bit. For example, all information bits in the DCI are a0, a1, ..., aN from a low to a high bit, assuming a0, a1, a3 are first information. The bit information of the domain, and the second information domain is the bit information represented by a4;

The specific information field may be other specific locations of all information bits of the DCI except the first information domain and the second information domain.

In implementation, the information field carrying the indication includes 1 bit information.

Specifically, the DCI type indication field includes 1 bit information, and may be expressed as follows:

0 or 1 indicates that the DCI is a DCI of a legacy subframe, and the terminal parses the information field in the DCI according to the DCI of the legacy subframe;

1 or 0 indicates that the DCI is a DCI of a short TTI, and the terminal parses the information field in the DCI according to the DCI of the short TTI;

In the implementation, the network side may further include:

When the DCI of the short TTI is not transmitted in the legacy control region, and/or when the DCI of the short TTI is transmitted in the control region of the short TTI, the indication is not carried in the information field.

Correspondingly, the terminal side may further include:

When the DCI of the short TTI is not transmitted in the legacy control region, and/or when the DCI of the short TTI is transmitted in the control region of the short TTI, the DCI format is not determined according to the indication.

Specifically, when it is not necessary to distinguish the DCI of the legacy subframe from the DCI of the short TTI, the DCI type indication domain may not appear:

When the network configuration or the DCI notification, the DCI of the short TTI is not transmitted in the legacy control area, the DCI type indication field may not exist in the DCI of the legacy subframe;

When the DCI of the short TTI is transmitted in the control region of the short TTI, the DCI type indication field may not exist in the DCI of the short TTI.

For the RNTI scrambling mode, in the implementation, on the network side, the Cyclic Redundancy Check (CRC) of the DCI of the legacy subframe and the CRC of the DCI of the short TTI are scrambled using different RNTIs.

Correspondingly, after receiving the DCI, the terminal distinguishes the DCI from the DCI of the legacy subframe or the DCI of the short TTI according to the CRC scrambled by using different RNTIs.

The following description will be made with reference to examples.

For the sake of clarity and convenience of description, the short TTI is represented as sTTI in the embodiment, and the DCI transmitted on the sTTI, that is, the DCI of the short TTI is represented as sDCI; the DCI of the legacy subframe is represented as the DCI of the legacy subframe; In another embodiment, the DCI of the short TTI and the DCI of the scheduled short TTI data are one meaning, and the DCI of the legacy subframe and the DCI of the scheduled legacy subframe data are a meaning. Of course, not necessarily in the examples, the same representations in other parts of the application also represent the same meaning.

Example 1:

Assuming that the UE transmits data on the first sTTI in the subframe, scheduling the DCI transmitted by the terminal on the sTTI is referred to as sDCI in this embodiment. The sDCI is transmitted in a legacy control region. It is also assumed that the DCI of the legacy subframe that the UE is scheduled to transmit on the normal subframe is DCI format1A. In order to reduce the number of blind detections on the terminal side and the complexity of processing, the size of the sDCI is the same as the size of DCI format0/1A. Assume sDCI and The bit length of DCI format0/10/1 is M bit. The terminal blindly checks the DCI according to the M bit in its own search space. Since the size of sDCI and DCI format0/1A are the same, the terminal can receive sDCI and DCI format1A through a set of blind detection. .

After receiving the sDCI or DCI format1A, the terminal determines, according to the bit information of the first information field, that the current DCI is sDCI or DCI format1A. For example, if the 1-bit information of the first information field is 0, it is determined that the current DCI is DCI format1A, and then each information field in the DCI is parsed according to the DCI format 1A; if the 1-bit information of the first information field is 1, the current information is determined. The DCI is sDCI, and then each information field in the DCI is parsed in the manner of sDCI.

Table 2: DCI format1A and sDCI format information fields

Example 2:

Assuming that the UE transmits data on the first sTTI in the subframe, scheduling the DCI transmitted by the terminal on the sTTI is referred to as sDCI in this embodiment. The sDCI is transmitted in a legacy control region. It is also assumed that the DCI of the legacy subframe transmitted by the UE on the normal subframe is DCI format1A. In order to reduce the number of blind detections on the terminal side and the complexity of processing, the size of the sDCI is the same as the size of DCI format0/1A. Assuming that the bit length of sDCI and DCI format1A is M bit, the terminal blindly checks the DCI according to the M bit in its own search space. Since the size of sDCI and DCI format1A are the same, the terminal can receive sDCI and DCI format1A through a set of blind detection.

After receiving the sDCI or DCI format1A, the terminal determines, according to the bit information of the second information field, that the current DCI is sDCI or DCI format1A. For example, if the 1-bit information of the second information field is 0, it is determined that the current DCI is DCI format1A, and then each information field in the DCI is parsed according to the DCI format 1A; if the 1-bit information of the second information field is 1, the current information is determined. The DCI is sDCI, and then each information field in the DCI is parsed in the manner of sDCI.

Table 3: DCI format1A and sDCI format information fields

Example 3:

Assuming that the UE transmits data on the first sTTI in the subframe, scheduling the DCI transmitted by the terminal on the sTTI is referred to as sDCI in this embodiment. The sDCI is transmitted in a legacy control region. It is also assumed that the DCI of the legacy subframe transmitted by the UE on the normal subframe is DCI format0. In order to reduce the number of blind detections on the terminal side and the complexity of processing, the size of the sDCI is the same as the size of DCI format0/1A. Assume that the bit length of sDCI and DCI format0/1A is M bit, and the terminal blindly checks the DCI according to the M bit in its own search space. Since the size of sDCI and DCI format0/1A are the same, the terminal can receive sDCI through a blind test. And DCI format0.

After receiving the sDCI or DCI format0, the terminal determines, according to the bit information of the second information field, that the current DCI is sDCI or DCI format0/1A. For example, if the 1-bit information of the second information field is 0, it is determined that the current DCI is DCI format0/1A, and then the current DCI is determined to be DCI format0 according to Flag for format0/1A, and then each DCI is parsed according to DCI format0. The information field; if the 1-bit information of the second information field is 1, it determines that the current DCI is sDCI, and then parses each information field in the DCI according to the sDCI manner.

Table 4: DCI format0 and sDCI format information fields

Example 4:

The DCI type indication field in the embodiment 1-3 may be placed at other specific locations in the DCI information bit, and details are not described herein again.

Example 5:

Assuming that the UE is scheduled to transmit data on a short TTI, the sDCI that schedules the terminal is transmitted in the control region of the short TTI. Since only the sDCI is transmitted in the control region of the short TTI, it is not confused with the DCI of the legacy subframe. Therefore, the DCI type indication field does not exist in the sDCI transmitted in the control region of the short TTI, and the terminal does not follow the sDCI after receiving the sDCI. There is a hypothesis of the DCI type indication field to resolve each information field in the sDCI.

Example 6

It is assumed that the control information of the sTTI cannot be transmitted in the legacy control region through the network or the DCI, and the DCI type indication field does not exist in the DCI of the scheduled normal subframe data transmission transmitted by the legacy control region, and the base station does not The DCI type indicates the domain to send the DCI, and the terminal parses each information domain in the DCI in a manner that does not have a DCI type indication field.

Example 7

Assuming that the UE transmits data on the first sTTI in the subframe, scheduling the DCI transmitted by the terminal on the sTTI is referred to as sDCI in this embodiment. The sDCI is transmitted in a legacy control region. It is also assumed that the DCI of the legacy subframe that the UE is scheduled to transmit on the normal subframe is DCI format1A. In order to reduce the number of blind detections on the terminal side and the complexity of processing, the size of the sDCI is the same as the size of DCI format0/1A. Assume that the bit length of sDCI and DCI format0/1A is M bit, and the terminal blindly checks the DCI according to the M bit in its own search space. Since the size of sDCI and DCI format0/1A are the same, the terminal can receive sDCI through a blind test. And DCI format1A.

It is assumed that for the DCI of the legacy subframe, the base station side uses RNTI1 to scramble the CRC; for the DCI of the sTTI, the base station side uses RNTI2 to scramble the CRC. The correspondence between the RNTI and the CRC is also known to the terminal side. After receiving the DCI, the terminal checks the DCI according to a CRC scrambled with different RNTI values. If the terminal successfully verifies the DCI according to the CRC of the RNTI1 scrambling, the DCI is determined to be the DCI of the legacy subframe, and the information domain is parsed according to the DCI format1A format. If the terminal successfully verifies the DCI according to the CRC of the RNTI2 scrambling, the DCI is determined to be the DCI of the sTTI, and the information domain is parsed according to the sDCI format.

Based on the same inventive concept, an apparatus for indicating and determining a DCI format is also provided in the embodiment of the present application. Since the principle of solving the problem is similar to the method of indicating and determining the DCI format, the implementation of these devices may refer to the method. The implementation, repetitions will not be repeated.

FIG. 6 is a schematic structural diagram of an apparatus for indicating a DCI format on a network side, as shown in the figure, which may include:

a determining module 601, configured to determine that a DCI information bit length of the short TTI is the same as a DCI information bit length of the legacy subframe;

The indication module 602 is configured to carry an indication in the information domain of the DCI of the legacy subframe and the DCI of the short TTI, where the indication is used to indicate that the DCI is a DCI of a legacy subframe or a DCI of a short TTI; or, use a different RNTI The value scrambles the DCI of the legacy subframe and the DCI of the short TTI.

In implementation, the DCI of the legacy subframe and the DCI of the short TTI are transmitted in the USS in the legacy control region.

In implementation, the length of the DCI of the short TTI is the same as the DCI format0/1A of the legacy subframe.

In the implementation, the indication module is further configured to carry the indication in a specific information field of the information bit in the DCI of the short TTI and the DCI format 0/1 A.

In an implementation, the specific information field is a first information field in which all information bits of the DCI start from a low position;

Or the specific information field is a second information field in which all information bits of the DCI start from a low position;

Or, the specific information field is other specific locations of all information bits of the DCI except the first information domain and the second information domain.

In implementation, the information field carrying the indication includes 1 bit information.

In an implementation, the indication module is further configured to: when the DCI of the short TTI is not transmitted in the legacy control region, and/or when the DCI of the short TTI is transmitted in the control region of the short TTI, do not carry the indication in the information domain.

In an implementation, the indication module is further configured to use the different RNTI to scramble the CRC of the legacy subframe and the CRC of the short TTI.

FIG. 7 is a schematic structural diagram of a device for determining a DCI format on a terminal side, as shown in the figure, which may include:

The receiving module 701 is configured to receive a DCI.

The distinguishing module 702 is configured to determine, according to the indication, that the DCI is a DCI of a legacy subframe or a DCI of a short TTI, where the information field of the DCI carries an indication, where the indication is used to indicate the DCI. The DCI is the DCI of the legacy subframe or the DCI of the short TTI; or, after receiving the DCI, determining, according to different RNTI, the DCI is the DCI of the legacy subframe or the DCI of the short TTI;

The length of the DCI information bit of the short TTI is the same as the length of the DCI information bit of the legacy subframe.

In implementation, the DCI of the legacy subframe and the DCI of the short TTI are USS in the legacy control region. Transmitted in.

In implementation, the length of the DCI of the short TTI is the same as the DCI format0/1A of the legacy subframe.

In an implementation, the information field carrying the indication is located in a DCI of a short TTI and a specific information field of an information bit in DCI format0/10/1.

In an implementation, the specific information field is a first information field in which all information bits of the DCI start from a low position;

Or the specific information field is a second information field in which all information bits of the DCI start from a low position;

Or, the specific information field is other specific locations of all information bits of the DCI except the first information domain and the second information domain.

In implementation, the information field carrying the indication includes 1 bit information.

In an implementation, the distinguishing module is further configured to: when the DCI of the short TTI is not transmitted in the legacy control region, and/or when the DCI of the short TTI is transmitted in the control region of the short TTI, the DCI format is not determined according to the indication.

The distinguishing module is further configured to: after receiving the DCI, distinguish the DCI from the DCI of the legacy subframe or the DCI of the short TTI according to the CRC scrambled by using different RNTIs.

For convenience of description, the various parts of the above described devices are described in terms of functions divided into various modules or units. Of course, the functions of each module or unit may be implemented in the same software or hardware in the implementation of the present application.

When the technical solution provided by the embodiment of the present application is implemented, it can be implemented as follows.

FIG. 8 is a schematic structural diagram of a base station, as shown in the figure, the base station includes:

The processor 800 is configured to read a program in the memory 820 and perform the following process:

Determining that the length of the DCI information bit of the short TTI is the same as the length of the DCI information bit of the legacy subframe;

The transceiver 810 is configured to receive and transmit data under the control of the processor 800, and performs the following processes:

Carrying an indication in an information field of a DCI of a legacy subframe and a DCI of a short TTI, where the indication is used to indicate that the DCI is a DCI of a legacy subframe or a DCI of a short TTI; or, using a different RNTI value for a legacy subframe The DCI is scrambled with the DCI of the short TTI.

In implementation, the DCI of the legacy subframe and the DCI of the short TTI are transmitted in the USS in the legacy control region.

In implementation, the length of the DCI of the short TTI is the same as the DCI format0/1A of the legacy subframe.

In an implementation, the information field carrying the indication is located in a DCI of a short TTI and a specific information field of an information bit in DCI format0/10/1.

In an implementation, the specific information field is a first information field in which all information bits of the DCI start from a low position;

Or the specific information field is a second information field in which all information bits of the DCI start from a low position;

Or the specific information field is other specific information bits of the DCI except the first information domain and the second information domain. position.

In implementation, the information field carrying the indication includes 1 bit information.

In implementation, it further includes:

When the DCI of the short TTI is not transmitted in the legacy control region, and/or when the DCI of the short TTI is transmitted in the control region of the short TTI, the indication is not carried in the information field.

In implementation, the CRC of the legacy CIC of the legacy subframe and the DCI of the short TTI are scrambled using different RNTIs.

Wherein, in FIG. 8, the bus architecture can include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 800 and various circuits of memory represented by memory 820. The bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein. The bus interface provides an interface. Transceiver 810 can be a plurality of components, including a transmitter and a transceiver, providing means for communicating with various other devices on a transmission medium. The processor 800 is responsible for managing the bus architecture and general processing, and the memory 820 can store data used by the processor 800 in performing operations.

FIG. 9 is a schematic structural diagram of a terminal. As shown in the figure, the terminal includes:

The processor 900 is configured to read a program in the memory 920 and perform the following process:

After receiving the DCI, determining, according to the indication, that the DCI is a DCI of a legacy subframe or a DCI of a short TTI, where the information field of the DCI carries an indication, where the indication is used to indicate that the DCI is a legacy subframe. DCI of DCI or short TTI;

Or, after receiving the DCI, determining, according to different RNTI, the DCI is a DCI of a legacy subframe or a DCI of a short TTI;

The length of the DCI information bit of the short TTI is the same as the length of the DCI information bit of the legacy subframe.

The transceiver 910 is configured to receive and transmit data under the control of the processor 900, and performs the following processes:

Receive DCI.

In implementation, the DCI of the legacy subframe and the DCI of the short TTI are transmitted in the USS in the legacy control region.

In implementation, the length of the DCI of the short TTI is the same as the DCI format0/1A of the legacy subframe.

In an implementation, the information field carrying the indication is located in a DCI of a short TTI and a specific information field of an information bit in DCI format0/10/1.

In an implementation, the specific information field is a first information field in which all information bits of the DCI start from a low position;

Or the specific information field is a second information field in which all information bits of the DCI start from a low position;

Or, the specific information field is other specific locations of all information bits of the DCI except the first information domain and the second information domain.

In implementation, the information field carrying the indication includes 1 bit information.

In implementation, it further includes:

When the DCI of the short TTI is not transmitted in the legacy control region, and/or when the DCI of the short TTI is transmitted in the control region of the short TTI, the DCI format is not determined according to the indication.

In the implementation, after the terminal receives the DCI, the DCI is classified into the DCI of the legacy subframe or the DCI of the short TTI according to the CRC scrambled by using different RNTIs.

In FIG. 9, the bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 900 and various circuits of memory represented by memory 920. The bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein. The bus interface provides an interface. Transceiver 910 can be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium. For different user equipments, the user interface 930 may also be an interface capable of externally connecting the required devices, including but not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.

The processor 900 is responsible for managing the bus architecture and general processing, and the memory 920 can store data used by the processor 900 in performing operations.

In summary, in the technical solution provided by the embodiment of the present application, when the DCI of the legacy subframe and the sDCI used for scheduling the sTTI data transmission are the same, the DCI type indication field is added to the DCI and the sDCI of the legacy subframe. It is used to determine the DCI or sDCI of the legacy subframe.

The technical solution provided by the embodiment of the present application can be used to distinguish the DCI and the sDCI of the legacy subframes of the same size, and help reduce the number of blind detections of the terminal when the sDCI is transmitted in the legacy control region.

Those skilled in the art will appreciate that embodiments of the present application can be provided as a method, system, or computer program product. Thus, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment in combination of software and hardware. Moreover, the application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. A processor that can provide these computer program instructions to a general purpose computer, a special purpose computer, an embedded processor, or other programmable data processing device To generate a machine such that instructions executed by a processor of a computer or other programmable data processing device generate functions for implementing a process in a flow or a flow and/or a block diagram in a block or blocks. s installation.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

It will be apparent to those skilled in the art that various modifications and changes can be made in the present application without departing from the spirit and scope of the application. Thus, it is intended that the present invention cover the modifications and variations of the present invention.

Claims (48)

A method for indicating a downlink control information DCI format, comprising: Determining that the DCI information bit length of the short transmission time interval TTI is the same as the DCI information bit length of the legacy legacy subframe; Carrying an indication in an information field of a DCI of a legacy subframe and a DCI of a short TTI, the indication being used to indicate that the DCI is a DCI of a legacy subframe or a DCI of a short TTI; or, using a different wireless network, temporarily identifying an RNTI value pair The DCI of the legacy subframe is scrambled with the DCI of the short TTI. The method of claim 1, wherein the DCI of the legacy subframe and the DCI of the short TTI are transmitted in a user-specific search space USS in a legacy control region legacy control region. The method of claim 1, wherein the length of the DCI of the short TTI is the same as the DCI format0/1A of the legacy subframe. The method according to claim 1, wherein the information field carrying the indication is located in a DCI of a short TTI and a specific information field of an information bit in DCI format0/10/1A. The method according to claim 4, wherein said specific information field is a first information field in which all information bits of the DCI start from a lower bit; Or the specific information field is a second information field in which all information bits of the DCI start from a low position; Or, the specific information field is other specific locations of all information bits of the DCI except the first information domain and the second information domain. The method of claim 1, wherein the information field carrying the indication comprises 1 bit of information. The method of any one of claims 1 to 6, further comprising: When the DCI of the short TTI is not transmitted in the legacy control region, and/or when the DCI of the short TTI is transmitted in the control region of the short TTI, the indication is not carried in the information field. The method of claim 1 wherein the cyclic redundancy check CRC of the DCI of the legacy subframe and the CRC of the DCI of the short TTI are scrambled using different RNTIs. A method for determining a DCI format, comprising: After receiving the DCI, determining, according to the indication, that the DCI is a DCI of a legacy subframe or a DCI of a short TTI, where the information field of the DCI carries an indication, where the indication is used to indicate that the DCI is a legacy subframe. DCI of DCI or short TTI; Or, after receiving the DCI, determining, according to different RNTI, the DCI is a DCI of a legacy subframe or a DCI of a short TTI; The length of the DCI information bit of the short TTI is the same as the length of the DCI information bit of the legacy subframe. The method of claim 9, wherein the DCI of the legacy subframe and the DCI of the short TTI are transmitted in a USS in a legacy control region. The method of claim 9, wherein the length of the DCI of the short TTI is the same as the DCI format0/1A of the legacy subframe. The method according to claim 9, wherein the information field carrying the indication is located in a DCI of a short TTI and a specific information field of an information bit in DCI format0/10/1. The method according to claim 12, wherein said specific information field is a first information field in which all information bits of the DCI start from a lower bit; Or the specific information field is a second information field in which all information bits of the DCI start from a low position; Or, the specific information field is other specific locations of all information bits of the DCI except the first information domain and the second information domain. The method according to claim 9, wherein the information field carrying the indication comprises 1-bit information. The method of any of claims 9 to 14, further comprising: When the DCI of the short TTI is not transmitted in the legacy control region, and/or when the DCI of the short TTI is transmitted in the control region of the short TTI, the DCI format is not determined according to the indication. The method according to claim 9, wherein after the terminal receives the DCI, the DCI is classified into a DCI of a legacy subframe or a DCI of a short TTI according to a CRC scrambled using a different RNTI. An apparatus for indicating a DCI format, comprising: a determining module, configured to determine that a DCI information bit length of the short TTI is the same as a DCI information bit length of the legacy subframe; An indication module, configured to carry an indication in an information field of a DCI of a legacy subframe and a DCI of a short TTI, where the indication is used to indicate that the DCI is a DCI of a legacy subframe or a DCI of a short TTI; or, use different RNTI values The DCI of the legacy subframe and the DCI of the short TTI are scrambled. The apparatus according to claim 17, wherein the DCI of the legacy subframe and the DCI of the short TTI are transmitted in a USS in a legacy control region. The apparatus according to claim 17, wherein the length of the DCI of the short TTI is the same as the DCI format0/1A of the legacy subframe. The apparatus according to claim 17, wherein the indication module is further configured to carry the indication in a specific information field of the information bit in the DCI of the short TTI and the DCI format 0/1 A. The apparatus according to claim 20, wherein said specific information field is all information bits of DCI The first information field starting from the low position; Or the specific information field is a second information field in which all information bits of the DCI start from a low position; Or, the specific information field is other specific locations of all information bits of the DCI except the first information domain and the second information domain. The apparatus according to claim 17, wherein said information field carrying the indication comprises 1-bit information. The apparatus according to any one of claims 17 to 22, wherein the indication module is further configured to: when the DCI of the short TTI is not transmitted in the legacy control region, and/or when the DCI of the short TTI is in the control region of the short TTI When transmitting, do not carry an indication in the information field. The apparatus according to claim 17, wherein the indication module is further configured to scramble the CRC of the legacy of the legacy subframe and the CRC of the short TTI of the DCI using different RNTIs. An apparatus for determining a DCI format, comprising: a receiving module, configured to receive a DCI; a distinguishing module, configured to determine, according to the indication, that the DCI is a DCI of a legacy subframe or a DCI of a short TTI, where the information field of the DCI carries an indication, where the indication is used to indicate the DCI a DCI of a legacy subframe or a DCI of a short TTI; or, after receiving the DCI, determining, according to different RNTI, the DCI is a DCI of a legacy subframe or a DCI of a short TTI; The length of the DCI information bit of the short TTI is the same as the length of the DCI information bit of the legacy subframe. The apparatus according to claim 25, wherein the DCI of the legacy subframe and the DCI of the short TTI are transmitted in a USS in a legacy control region. The apparatus according to claim 25, wherein the length of the DCI of the short TTI is the same as the DCI format0/1A of the legacy subframe. The apparatus according to claim 25, wherein the information field carrying the indication is located in a DCI of a short TTI and a specific information field of an information bit in DCI format0/10/1. The apparatus according to claim 28, wherein said specific information field is a first information field in which all information bits of the DCI start from a lower bit; Or the specific information field is a second information field in which all information bits of the DCI start from a low position; Or, the specific information field is other specific locations of all information bits of the DCI except the first information domain and the second information domain. The apparatus according to claim 25, wherein the information field carrying the indication comprises 1-bit information. The apparatus according to any one of claims 25 to 30, wherein the distinguishing module is further configured to: when the DCI of the short TTI is not transmitted in the legacy control region, and/or when the DCI of the short TTI is in the control region of the short TTI When transmitting, the DCI format is not determined according to the indication. The apparatus according to claim 25, wherein the distinguishing module is further configured to: after receiving the DCI, distinguish the DCI from the DCI of the legacy subframe or the DCI of the short TTI according to the CRC scrambled using different RNTIs. An apparatus for indicating a DCI format, comprising: A processor for reading a program in the memory, performing the following process: After determining that the DCI information bit length of the short TTI is the same as the DCI information bit length of the legacy subframe, the indication is carried in the information field of the DCI of the legacy subframe and the DCI of the short TTI, where the indication is used to indicate that the DCI is legacy The DCI of the frame or the DCI of the short TTI; or, the DCI of the legacy subframe and the DCI of the short TTI are scrambled using different RNTI values; A transceiver for receiving and transmitting data under the control of a processor. The apparatus according to claim 33, wherein the DCI of the legacy subframe and the DCI of the short TTI are transmitted in a USS in a legacy control region. The apparatus according to claim 33, wherein the length of the DCI of the short TTI is the same as the DCI format0/1A of the legacy subframe. The apparatus according to claim 33, wherein the processor is further configured to carry the indication in a specific information field of the information bit in the DCI of the short TTI and the DCI format 0/1 A. The apparatus according to claim 36, wherein said specific information field is a first information field in which all information bits of the DCI start from a lower bit; Or the specific information field is a second information field in which all information bits of the DCI start from a low position; Or, the specific information field is other specific locations of all information bits of the DCI except the first information domain and the second information domain. The apparatus according to claim 33, wherein said information field carrying the indication comprises 1-bit information. The apparatus according to any one of claims 33 to 38, wherein the processor is further configured to: when the DCI of the short TTI is not transmitted in the legacy control region, and/or when the DCI of the short TTI is in the control region of the short TTI When transmitting, do not carry an indication in the information field. The apparatus according to claim 33, wherein the processor is further configured to scramble the CRC of the legacy of the legacy subframe and the CRC of the short TTI of the DCI using different RNTIs. An apparatus for determining a DCI format, comprising: A processor for reading a program in the memory, performing the following process: After receiving the DCI, determining, according to the indication, that the DCI is a DCI of a legacy subframe or a DCI of a short TTI, where the information field of the DCI carries an indication, where the indication is used to indicate that the DCI is a legacy subframe. DCI of DCI or short TTI; Or, after receiving the DCI, determining, according to different RNTI, the DCI is a DCI of a legacy subframe or a DCI of a short TTI; The length of the DCI information bit of the short TTI is the same as the length of the DCI information bit of the legacy subframe. A transceiver for receiving and transmitting data under the control of a processor. The apparatus according to claim 41, wherein the DCI of the legacy subframe and the DCI of the short TTI are transmitted in a USS in a legacy control region. The apparatus according to claim 41, wherein the length of the DCI of the short TTI is the same as the DCI format0/1A of the legacy subframe. The apparatus according to claim 41, wherein the information field carrying the indication is located in a DCI of a short TTI and a specific information field of an information bit in DCI format0/1A. The apparatus according to claim 44, wherein said specific information field is a first information field in which all information bits of the DCI start from a lower bit; Or the specific information field is a second information field in which all information bits of the DCI start from a low position; Or, the specific information field is other specific locations of all information bits of the DCI except the first information domain and the second information domain. The apparatus according to claim 41, wherein said information field carrying the indication comprises 1-bit information. The apparatus according to any one of claims 41 to 46, wherein the processor is further configured to: when the DCI of the short TTI is not transmitted in the legacy control region, and/or when the DCI of the short TTI is in the control region of the short TTI When transmitting, the DCI format is not determined according to the indication. The apparatus according to claim 41, wherein the processor is further configured to: after receiving the DCI, distinguish the DCI of the legacy subframe from the DCI of the short TTI or the short TTI according to the CRC scrambled by using different RNTIs.

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