CN111698735A - Communication method and communication device in wireless communication technical field - Google Patents

Abstract

The present application provides a communication method and a communication device. The method includes: receiving first information from a source base station, where the first information includes downlink measurement result information between a first terminal and a target base station and the One or more pieces of location information of the first terminal, the first information is used to determine a first timing advance, and the first timing advance is uplink transmission between the first terminal and the target base station and sending the information of the first timing advance to the first terminal through the source base station. In this embodiment of the present application, the target base station can determine the timing advance, and send the timing advance to the terminal device, so that the terminal device can skip the random access procedure during the base station handover process, reducing signaling overhead and data transmission. delay and improve user experience.

Description

A communication method and communication device in the field of wireless communication technology

technical field

The present application relates to the field of wireless communication technologies, and in particular, to a communication method and a communication device.

Background technique

In the existing communication network, with the movement of terminal equipment, when the terminal equipment that is using network services moves from the coverage of one cell to the coverage of another cell or due to the adjustment of the wireless transmission traffic load, in order to ensure the continuity of communication. The system needs to transfer the communication link between the terminal equipment and the original cell to the new cell, and this process is called handover. In the existing handover process between base stations, data transmission interruption and delay will be caused. For example, random access is included in the handover process. The main function of random access is to determine the terminal equipment and the target cell under the target base station. The amount of timing advance (TA) and the initial transmission power (ITP) of the communication between them will bring a delay of at least tens of milliseconds in this step.

With the development of communication technology, the requirements for delay in communication protocols are getting higher and higher. Therefore, in the handover process of terminal equipment, how to reduce the delay has become an urgent problem to be solved.

SUMMARY OF THE INVENTION

The present application provides a communication method and a communication device. During the handover process, the timing advance can be obtained from the target base station, so that the random access procedure can be skipped and the time delay can be reduced.

In a first aspect, a communication method is provided. The method can be executed by a network device, or can also be executed by a chip or circuit configured in the network device. The network device can be a target base station, which is not limited in this application.

For example, the network device may be a base station, such as an eNB, a gNB, a CU or a DU, etc., which is not limited.

Specifically, the method includes: receiving first information from the source base station, where the first information includes one or more of downlink measurement result information between the first terminal and the target base station and location information of the first terminal, The first information is used to determine the first timing advance, which is the timing advance of uplink transmission between the first terminal and the target base station; the information of the first timing advance is sent to the first terminal through the source base station.

The communication method provided by the embodiment of the present application can determine the timing advance amount according to the first information, so that the random access procedure can be skipped in the process of base station handover, the signaling overhead and the delay of data transmission can be reduced, and the user experience can be improved. .

With reference to the first aspect, in some implementations of the first aspect, the method further includes: determining the distance between the first terminal and the target base station according to the first information; determining the first terminal according to the distance between the first terminal and the target base station A certain amount of time ahead.

With reference to the first aspect, in some implementations of the first aspect, when the first information includes measurement result information, determining the distance between the terminal device and the target base station according to the first information includes: determining the distance between the target base station and the target base station according to the measurement result information. Path loss between the first terminal; the distance between the first terminal and the target base station is determined according to the path loss.

With reference to the first aspect, in some implementations of the first aspect, the method further includes: acquiring a mapping relationship, where the mapping relationship is a mapping relationship between the second information and the second timing advance, and the second information includes the second One or more of the downlink measurement result information between the terminal and the target base station and the location information of the second terminal, and the second timing advance is the uplink transmission between the second terminal and the target base station timing advance;

The first timing advance is determined according to the mapping relationship and the first information.

With reference to the first aspect, in some implementations of the first aspect, the measurement result information includes information on the received power of the reference signal.

With reference to the first aspect, in some implementations of the first aspect, the first information is carried in the handover request message, and the information of the first timing advance is carried in the handover confirmation message and the handover command message.

With reference to the first aspect, in some implementations of the first aspect, the method further includes: receiving an RRC reconfiguration complete message from the first terminal, where the RRC reconfiguration complete message is transmitted based on the first timing advance.

With reference to the first aspect, in some implementations of the first aspect, the first information is further used to determine the initial transmit power of uplink transmission between the first terminal and the target base station; the method further includes: sending the first terminal to the first terminal through the source base station Send initial transmit power information.

With reference to the first aspect, in some implementations of the first aspect, the method further includes: determining a path loss between the first terminal and the target base station according to the first information; and determining an initial transmit power according to the path loss.

With reference to the first aspect, in some implementations of the first aspect, when the first information includes location information of the first terminal, determining the path loss between the first terminal and the target base station according to the first information includes: according to the first The location information of the terminal determines the distance between the first terminal and the target base station; the path loss between the first terminal and the target base station is determined according to the distance between the first terminal and the target base station.

With reference to the first aspect, in some implementations of the first aspect, an RRC reconfiguration complete message is received from the first terminal, where the RRC reconfiguration complete message is transmitted based on the initial transmit power.

In a second aspect, a communication method is provided, and the method can be executed by a terminal device, or can also be executed by a chip or circuit configured in the terminal device, which is not limited in this application.

Specifically, the method includes: receiving from the target base station through the source base station a timing advance for uplink transmission between the first terminal and the target base station; wherein the timing advance is determined according to first information, and the first information includes the first terminal One or more of downlink measurement result information with the target base station and location information of the first terminal.

With reference to the second aspect, in some implementations of the second aspect, the measurement result information includes information on the received power of the reference signal.

With reference to the second aspect, in some implementations of the second aspect, the information of the timing advance is carried in the handover confirmation message and the handover command message.

With reference to the second aspect, in some implementations of the second aspect, the method further includes: sending an RRC reconfiguration complete message to the target base station, where the RRC reconfiguration complete message is transmitted based on the timing advance.

With reference to the second aspect, in some implementations of the second aspect, if the sending of the RRC reconfiguration complete message fails, the method further includes: initiating random access to the target base station.

With reference to the second aspect, in some implementations of the second aspect, the method further includes: receiving from the target base station, through the source base station, information about the initial transmit power of uplink transmission between the first terminal and the target base station, where the initial transmit power is determined according to the first information.

With reference to the second aspect, in some implementations of the second aspect, the method further includes: sending an RRC reconfiguration complete message to the target base station, where the RRC reconfiguration complete message is transmitted based on the initial transmit power.

In a third aspect, a communication method is provided. The method can be executed by a network device, or can also be executed by a chip or circuit configured in the network device. The network device can be a source base station, which is not limited in this application.

For example, the network device may be a base station, such as an eNB, a gNB, a CU or a DU, etc., which is not limited.

Specifically, the method includes: sending first information to the target base station, where the first information is used to determine the timing advance of uplink transmission between the first terminal and the target base station, and the first information includes downlink transmission between the first terminal and the target base station One or more of the measurement result information of the link and the location information of the first terminal; receiving the information of the timing advance from the target base station; and sending the information of the timing advance to the first terminal.

With reference to the third aspect, in some implementations of the third aspect, the measurement result information includes information on the received power of the reference signal.

With reference to the third aspect, in some implementations of the third aspect, the first information is carried in the handover request message, and the timing advance information is carried in the handover confirmation message and the handover command message.

With reference to the third aspect, in some implementations of the third aspect, the method further includes: receiving from the target base station information about the initial transmit power of uplink transmission between the first terminal and the target base station, where the initial transmit power is based on the first Determined by a piece of information; sending the information of the initial transmit power to the first terminal.

In a fourth aspect, a communication method is provided. The method can be executed by a network device, or can also be executed by a chip or circuit configured in the network device. The network device can be a target base station, which is not limited in this application.

For example, the network device may be a base station, such as an eNB, a gNB, a CU or a DU, etc., which is not limited.

Specifically, the method includes: sending first indication information to the first terminal through the source base station, where the first indication information is used to instruct the first terminal to determine the timing advance of uplink transmission between the first terminal and the target base station.

With reference to the fourth aspect, in some implementations of the fourth aspect, the first indication information includes location information of the target base station.

With reference to the fourth aspect, in some implementations of the fourth aspect, the first indication information is carried in the handover confirmation message and the handover command message.

With reference to the fourth aspect, in some implementations of the fourth aspect, an RRC reconfiguration complete message is received from the first terminal, and the RRC reconfiguration complete message is transmitted based on the timing advance.

With reference to the fourth aspect, in some implementations of the fourth aspect, the first indication information is used to instruct the first terminal to determine the initial transmit power of uplink transmission between the first terminal and the target base station.

With reference to the fourth aspect, in some implementations of the fourth aspect, an RRC reconfiguration complete message is received from the first terminal, where the RRC reconfiguration complete message is transmitted based on the initial transmit power.

In a fifth aspect, a communication method is provided, and the method can be executed by a terminal device, or can also be executed by a chip or circuit configured in the terminal device, which is not limited in this application.

Specifically, the method includes: receiving first indication information from the target base station through the source base station, where the first indication information is used to instruct the first terminal to determine a timing advance for uplink transmission between the first terminal and the target base station; determining the timing advance .

With reference to the fifth aspect, in some implementations of the fifth aspect, determining the timing advance includes: determining the distance between the first terminal and the target base station; determining the timing advance according to the distance between the first terminal and the target base station quantity.

With reference to the fifth aspect, in some implementations of the fifth aspect, determining the distance between the first terminal and the target base station includes: determining the target base station according to downlink measurement result information between the first terminal and the target base station The path loss with the first terminal; the distance between the first terminal and the target base station is determined according to the path loss.

With reference to the fifth aspect, in some implementations of the fifth aspect, the first indication information further includes location information of the target base station, and determining the distance between the first terminal and the target base station includes: determining the first terminal according to the location information of the target base station. The distance between a terminal and the target base station.

With reference to the fifth aspect, in some implementations of the fifth aspect, determining the timing advance includes: acquiring a mapping relationship, where the mapping relationship is a mapping relationship between the second information and the second timing advance, and the second information includes One or more of the downlink measurement result information between the second terminal and the target base station and the location information of the second terminal, and the second timing advance is the timing of uplink transmission between the second terminal and the target base station advance;

The timing advance is determined according to the mapping relationship and the first information.

With reference to the fifth aspect, in some implementations of the fifth aspect, the measurement result information includes information of the received power of the reference signal.

With reference to the fifth aspect, in some implementations of the fifth aspect, the first indication information is carried in the handover confirmation message and the handover command message.

With reference to the fifth aspect, in some implementations of the fifth aspect, the method further includes: sending an RRC reconfiguration complete message to the target base station, where the RRC reconfiguration complete message is transmitted based on the first timing advance.

With reference to the fifth aspect, in some implementations of the fifth aspect, the first indication information is further used to instruct the first terminal to determine the initial transmit power of uplink transmission between the first terminal and the target base station; the method further includes: determining the first The initial transmit power of uplink transmission between a terminal and the target base station.

With reference to the fifth aspect, in some implementations of the fifth aspect, determining the initial transmit power of the uplink transmission between the first terminal and the target base station includes: determining the measurement result information of the downlink between the first terminal and the target base station The path loss between the first terminal and the target base station; the initial transmit power is determined according to the path loss.

With reference to the fifth aspect, in some implementations of the fifth aspect, when the first information includes the location information of the target base station, determining the path loss between the first terminal and the target base station includes: determining the first terminal according to the location information of the target base station. The distance between a terminal and the target base station; the path loss between the first terminal and the target base station is determined according to the distance between the first terminal and the target base station.

With reference to the fifth aspect, in some implementations of the fifth aspect, an RRC reconfiguration complete message is sent to the target base station, where the RRC reconfiguration complete message is transmitted based on the initial transmit power.

A sixth aspect provides a communication method, which can be executed by a network device, or can also be executed by a chip or circuit configured in the network device, and the network device can be a source base station, which is not limited in this application.

For example, the network device may be a base station, such as an eNB, a gNB, a CU or a DU, etc., which is not limited.

Specifically, the method includes: receiving first indication information sent by the target base station, where the first indication information is used to instruct the first terminal to determine a timing advance for uplink transmission between the first terminal and the target base station; sending the first indication to the first terminal Instructions.

With reference to the sixth aspect, in some implementations of the sixth aspect, the first indication information includes location information of the target base station.

With reference to the sixth aspect, in some implementations of the sixth aspect, the first indication information is used to instruct the first terminal to determine the initial transmit power of uplink transmission between the first terminal and the target base station.

With reference to the sixth aspect, in some implementations of the sixth aspect, the first indication information is carried in the handover confirmation message and the handover command message.

A seventh aspect provides a communication device, the communication device includes a processor, the processor is coupled with a memory, the memory is used to store a computer program or instruction, the processor executes the computer program or instruction, so that the above-mentioned first aspect to The method of any of the sixth aspects is performed, the communication apparatus may further comprise the memory.

In an eighth aspect, a communication device is provided, the communication device includes one or more modules for implementing the method of any one of the above-mentioned first to sixth aspects, the one or more modules can be combined with The steps of the method of any one of the first to sixth aspects above correspond to.

In a ninth aspect, a chip is provided, the chip includes a processor and an interface circuit, the interface circuit is coupled to the processor, and the processor is used for running a computer program or instruction to implement any one of the first to sixth aspects. In one aspect of the method, the interface circuit is used to communicate with other modules outside the chip.

In a tenth aspect, a computer storage medium is provided, storing a program for implementing the method of any one of the above-mentioned first to sixth aspects. When the program is run in the wireless communication device, the wireless communication device is caused to perform the method of any one of the first to sixth aspects.

In an eleventh aspect, an embodiment of the present application provides a computer program product, where the program product includes a program, and when the program is executed, the method of any one of the above-mentioned first to sixth aspects is executed.

In this embodiment of the present application, the target base station can determine the first timing advance and the first initial transmit power, and send the above-mentioned relevant information to the terminal device, and the terminal device can skip the random access procedure (the random access procedure takes time About tens of milliseconds), and directly use the above-mentioned relevant parameters to establish a connection with the target base station, and perform uplink data transmission, thereby reducing signaling overhead, reducing delay, and improving user experience.

Description of drawings

FIG. 1 is a schematic diagram of a communication system applicable to the method provided by an embodiment of the present application;

2 is a schematic flowchart of an example of the communication method of the present application;

3 is a schematic flowchart of another example of the communication method of the present application;

FIG. 4 is a schematic flowchart of still another example of the communication method of the present application;

FIG. 5 is a schematic flowchart of still another example of the communication method of the present application;

FIG. 6 is a schematic flowchart of still another example of the communication method of the present application;

FIG. 7 is a schematic flowchart of still another example of the communication method of the present application;

FIG. 8 is a schematic structural diagram of a network device provided by an embodiment of the present application;

9 is a schematic structural diagram of a terminal device provided by an embodiment of the present application;

FIG. 10 is a schematic structural diagram of a communication device provided by an embodiment of the present application;

FIG. 11 is a schematic block diagram of a network device provided by an embodiment of the present application;

12 is a schematic block diagram of a terminal device provided by an embodiment of the present application;

FIG. 13 is a schematic block diagram of a network device provided by an embodiment of the present application.

Detailed ways

The technical solutions in the present application will be described below with reference to the accompanying drawings.

The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: long term evolution (long term evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD), universal mobile telecommunication system (UMTS), 5th generation (5G) system or new radio (NR) or other evolved communication systems and the like.

The terminal equipment in the embodiments of this application may also be referred to as: terminal, user equipment (user equipment, UE), mobile station (mobile station, MS), mobile terminal (mobile terminal, MT), access terminal, subscriber unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device, etc.

The terminal device may be a device that provides voice/data connectivity to the user, such as a handheld device with a wireless connection function, a vehicle-mounted device, and the like. At present, some examples of terminals are: mobile phone (mobile phone), tablet computer, notebook computer, palmtop computer, mobile internet device (mobile internet device, MID), wearable device, virtual reality (virtual reality, VR) device, augmented reality (augmented reality, AR) equipment, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, and smart grids wireless terminal in transportation safety, wireless terminal in smart city, wireless terminal in smart home, cellular phone, cordless phone, session initiation protocol, SIP) telephones, wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, in-vehicle devices , a wearable device, a terminal device in a 5G network, or a terminal device in a future evolved public land mobile network (public land mobile network, PLMN), etc., which are not limited in the embodiments of the present application.

As an example and not a limitation, in this embodiment of the present application, the terminal device may also be a wearable device. Wearable devices can also be called wearable smart devices, which are the general term for the intelligent design of daily wear and the development of wearable devices using wearable technology, such as glasses, gloves, watches, clothing and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction, and cloud interaction. In a broad sense, wearable smart devices include full-featured, large-scale, complete or partial functions without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, which needs to cooperate with other devices such as smart phones. Use, such as all kinds of smart bracelets, smart jewelry, etc. for physical sign monitoring.

In addition, in the embodiment of the present application, the terminal device may also be a terminal device in an internet of things (Internet of things, IoT) system. IoT is an important part of the future development of information technology, and its main technical feature is that items are passed through communication technology. Connect with the network, so as to realize the intelligent network of human-machine interconnection and interconnection of things.

In addition, the network device in this embodiment of the present application may be a device used to communicate with a terminal device, and the network device may also be referred to as an access network device, a wireless access network device, or a base station, etc., and may be a transmission reception point (transmission reception point). , TRP), or a base transceiver station (BTS) in the global system for mobile communications (GSM) system or code division multiple access (CDMA), or a broadband CDMA A base station (NodeB, NB) in a wideband code division multiple access (WCDMA) system, an evolved base station (evolved NodeB, eNB or eNodeB) in an LTE system, or a base station controller (BSC) ), a base transceiver station (BTS), a home base station (for example, a home evolved NodeB, or a home Node B, HNB), a base band unit (BBU), or a cloud radio access network (cloudradio access network (CRAN) scenario, or the network device may be a relay station, an access point, a vehicle-mounted device, a wearable device, a network device in a 5G network, or a network device in a future evolved PLMN network, etc. It is an access point (access point, AP) in the WLAN, and may be a new radio node (new radio nodeB, gNB) in a new radio system (new radio, NR) system, which is not limited in this embodiment of the present application.

In a network structure, a network device may include a centralized unit (CU) node, or a distributed unit (DU) node, or a RAN device including a CU node and a DU node, or a control plane CU node (CU node). - RAN equipment for CP nodes) and user plane CU nodes (CU-UP nodes) and DU nodes.

The network equipment provides services for the terminal equipment through the cell or the transceiver point in the cell. The transceiver point communicates, the cell can be the cell corresponding to the transceiver point, the cell can belong to a macro base station (for example, a macro eNB or a macro gNB, etc.), or it can belong to a base station corresponding to a small cell, where the small cell can include : Urban cell (metro cell), micro cell (micro cell), pico cell (pico cell), femto cell (femtocell), etc. These small cells have the characteristics of small coverage and low transmit power, and are suitable for providing high-speed Data transfer service.

FIG. 1 is a schematic diagram of a system 100 to which the switching method according to the embodiment of the present application can be applied. As shown in FIG. 1 , the communication system 100 may include at least two base stations, such as base station 1 and base station 2 as shown in FIG. 1 . The communication system 100 may also include at least one terminal, such as terminal 1, terminal 2, terminal 3 and terminal 4 as shown in FIG. 1 . Communication between the base station and the terminal may be through a wireless link. For example, when terminal 1 is within the coverage of base station 1, terminal 1 can wirelessly communicate with base station 1, and when terminal 1 is within the coverage of base station 2, terminal 1 can wirelessly communicate with base station 2. It should be noted that, in this embodiment of the present application, the communication between the terminal and the base station can be understood as the communication between the terminal and the cell under the base station, for example, the cell 1 in FIG. 1 belongs to the cell under the base station 1, and the cell 2 in FIG. 1 belongs to the base station 2 The communication between base station 1 and terminal 1 can be understood as the communication between base station 1 and terminal 1 through the wireless resources provided by cell 1, and the communication between base station 2 and terminal 1 can be understood as the communication between base station 1 and terminal 1 through the wireless resources provided by cell 1. resources to communicate. Terminal 2 , terminal 3 and terminal 4 are located within the coverage of base station 2 and can perform wireless communication with base station 2 .

In FIG. 1, as the terminal equipment 1 gradually moves from the coverage of one cell 1 to the coverage of cell 2, or, due to the need to adjust the wireless transmission traffic load of cell 1 and other reasons, in order to ensure the continuity of communication and service The system needs to transfer the communication link between the terminal equipment 1 and the cell 1 to the cell 2, that is, the serving base station of the terminal equipment 1 needs to be switched from the base station 1 to the base station 2. During the handover process, since the terminal device 1 needs to perform random access with the cell 2, a delay in data transmission will be caused.

The embodiment of the present application provides a communication method, which can determine the parameters of the communication between the terminal device 1 and the cell 2 in advance during the handover process, and the terminal device 1 can skip the random access process to communicate with the cell 2 under the base station 2, reducing the number of Signaling overhead and delay of data transmission.

First, some terms involved in the embodiments of the present application are explained below:

1. Timing advance (TA)

TA can be understood as, in order to avoid interference between uplink transmissions of different terminals in the cell, the base station may require that uplink transmissions of different terminals in the cell arrive at the base station at the same time or within a certain time range.

Each terminal may have its own TA. From the perspective of the terminal, TA can be understood as the time offset between the terminal receiving downlink data and sending uplink data. Because the transmission delays of different terminals are different, the TA of different terminals may be different. For example, the transmission delay of the terminal farther from the base station is larger, and the terminal closer to the base station needs to send uplink transmission in advance.

By controlling the TA of each terminal, the base station can control the uplink transmissions of different terminals to arrive at the base station at the same time or within a certain time range.

Alternatively, TA can be understood as that the base station can control the time when the uplink transmission of the terminal arrives at the base station, so that it is the same as the time domain resource of the uplink transmission allocated by the base station or within an error range.

With the development of wireless communication, the TA may have other interpretations, which are not limited in this embodiment of the present application.

For the content of the TA, reference may be made to the relevant content in Section 4.3 of 38.211 Version (version, V) 15.0.0 of the 3rd Generation Partnership Project (3GPP) (technical specification, TS).

2. Initial transmission power (ITP)

It can be understood as the power at which the terminal sends the uplink transmission to the base station, for example, the power at which the terminal sends the uplink transmission to the base station for the first time.

The methods provided by the embodiments of the present application are described below. In the following, the source base station may be base station 1 in FIG. 1 , the target base station may be base station 2 in FIG. 1 , the first terminal may be terminal 1 in FIG. 1 , and the second terminal may be is one or more of terminal 2, terminal 3 and terminal 4 in FIG. 1 .

FIG. 2 is a schematic flowchart of a communication method 200 of the present application. The following describes a communication method 200 provided by an embodiment of the present application with reference to FIG. 2 . The method 200 includes:

Step 210: The source base station sends first information to the target base station, where the first information includes one or more of downlink measurement result information between the first terminal and the target base station and location information of the first terminal.

The first information is used to determine the timing advance for uplink transmission between the first terminal and the target base station. For convenience of description below, the timing advance for uplink transmission between the first terminal and the target base station is referred to as the first timing advance.

Optionally, the downlink measurement result information between the first terminal and the target base station may include reference signal received power (reference signal receiving power, RSRP), signal noise ratio (Signal Noise Ratio, SNR), received signal strength indication Any one or more of (received signal strength indication, RSSI) or reference signal receive quality (reference signal receive quality, RSRQ).

Optionally, the location information of the first terminal may be information indicating the location of the first terminal, for example, may be geographic coordinates of the first terminal, such as a latitude and longitude location.

The following will introduce the determination of the timing advance or the initial transmit power according to the first information as an example. It should be noted that the first information can also be used for other purposes, such as for determining other parameter information for the communication between the first terminal and the target base station. This embodiment of the present application is not limited, and steps 220 to 240 are optional.

Step 220: The target base station determines a first timing advance according to the first information.

Optionally, the first information is also used to determine the initial transmit power of the uplink transmission between the first terminal and the target base station. For convenience of description below, the initial transmit power of the uplink transmission between the first terminal and the target base station is referred to as the first Initial transmit power. Step 220 may further include the target base station determining the first initial transmit power according to the first information.

Step 230: The target base station sends the information of the first timing advance to the source base station.

Optionally, step 230 may further include the target base station sending information of the first initial transmit power to the source base station.

Step 240: The source base station sends the information of the first timing advance to the first terminal.

Optionally, step 240 may further include the source base station sending information of the first initial transmit power to the first terminal.

Optionally, steps 230 and 240 may be understood as the target base station sending the first timing advance to the first terminal through the source base station.

Optionally, steps 230 and 240 may be understood as the target base station sending the first initial transmit power to the first terminal through the source base station.

Optionally, the method 200 may further include that the first terminal performs uplink transmission with the target base station according to the first timing advance, for example, the first terminal sends uplink data to the target base station according to the first timing advance.

Optionally, the method 200 may further include that the first terminal performs uplink transmission with the target base station according to the first initial transmission power, for example, the first terminal sends uplink data to the target base station according to the first initial transmission power.

The following describes how the target base station determines the first timing advance according to the first information in step 220.

As a first implementation manner, the target base station may determine the distance (distance, D) between the first terminal and the target base station according to the first information, and then determine the first timing advance according to the distance between the first terminal and the target base station.

Regarding how the target base station determines the distance between the first terminal and the target base station according to the first information, several examples are provided below:

In a first example, the first information includes downlink measurement result information between the first terminal and the target base station.

The target base station may determine a path loss (path loss, PL) between the target base station and the first terminal according to the measurement result information, and determine the distance between the first terminal and the target base station according to the path loss.

In the second example, the first information includes location information of the first terminal.

The target base station may determine the distance between the first terminal and the target base station according to the location information of the first terminal and the location information of the target base station.

In a third example, the first information includes downlink measurement result information between the first terminal and the target base station and location information of the first terminal.

The target base station may determine the distance between the first terminal and the target base station according to the downlink measurement result information between the first terminal and the target base station (for details, refer to the first example), and according to the location information of the first terminal Determine the distance between the first terminal and the target base station (for details, refer to the second example), then compare the distances between the first terminal and the target base station calculated by these two implementations, and select one as the first terminal The distance from the target base station, or, on the basis of the distance between the first terminal and the target base station calculated by these two implementations, the distance between the first terminal and the target base station is obtained through a certain algorithm (for example, averaging). The distance between them is not limited to the specific algorithm in this embodiment of the present application.

As a second implementation manner, the target base station may acquire the mapping relationship between the second information and the second timing advance, and then determine the first timing advance according to the mapping relationship and the first information.

It can be understood that the second information and the second timing advance may be information of terminals that have accessed the target base station in the past, and the target base station may obtain the first timing advance according to the historical information.

The second information includes one or more of downlink measurement result information between the second terminal and the target base station and location information of the second terminal, and the second timing advance is the distance between the second terminal and the target base station. Timing advance for upstream transmission.

Optionally, the target base station may acquire the second information when communicating with the second terminal. For example, the second terminal may have established a communication connection with the target base station, and the second terminal may report the relationship between the second terminal and the target base station to the target base station. One or more of downlink measurement result information and location information of the second terminal.

Optionally, the target base station may obtain the timing advance of the second terminal during the random access process of the second terminal, or the target base station may obtain the timing advance of the second terminal after performing a radio resource control (radio resource control, RRC) connection with the second terminal. The timing advance of the second terminal.

Optionally, the target base station may obtain the mapping relationship from other network devices, such as other base stations, core network elements, or servers.

Optionally, in the second implementation manner, the second terminal may be one or more terminals, and the mapping relationship between the second information and the second timing advance can be understood as a plurality of second information and a plurality of second information. The mapping relationship between timing advances, such as one-to-one, one-to-many, or many-to-one, is not limited in this embodiment of the present application.

Optionally, the second terminal may include the first terminal, for example, the first terminal first communicates with the target base station, then switches to another base station, and then switches from the other base station to the target base station, where the second information may include the first terminal number of the first terminal. One or more of the downlink measurement result information and the location information of the second terminal when communicating with the target base station once, where the second timing advance is the uplink when the first terminal communicates with the target base station for the first time The timing advance of the transmission.

The following describes how the target base station determines the first initial transmit power according to the first information in step 220.

As a first implementation manner, the target base station may determine the path loss between the first terminal and the target base station according to the first information, and then determine the first initial transmit power according to the path loss between the first terminal and the target base station.

Regarding how the target base station determines the path loss between the first terminal and the target base station according to the first information, several examples are provided below:

In a first example, the first information includes downlink measurement result information between the first terminal and the target base station.

The target base station may determine the path loss between the target base station and the first terminal according to the measurement result information.

In the second example, the first information includes location information of the first terminal.

The target base station may determine the distance between the first terminal and the target base station according to the location information of the first terminal and the target base station, and determine the distance between the first terminal and the target base station according to the distance between the first terminal and the target base station. path loss between.

In a third example, the first information includes downlink measurement result information between the first terminal and the target base station and location information of the first terminal.

The target base station may determine the path loss between the first terminal and the target base station according to the downlink measurement result information between the first terminal and the target base station (for details, refer to the first example), and according to the location of the first terminal The information determines the path loss between the first terminal and the target base station (for details, refer to the second example), and then compare the path losses between the first terminal and the target base station calculated by these two implementations, and select one as the The path loss between the first terminal and the target base station, or, on the basis of the path loss between the first terminal and the target base station calculated by the two implementations, obtain the first For the path loss between the terminal and the target base station, the embodiment of the present application does not limit the specific algorithm.

As a second implementation manner, the target base station may acquire a mapping relationship between the second information and the second initial transmission power, and then determine the first initial transmission power according to the mapping relationship and the first information.

It can be understood that the second information and the second initial transmit power may be information of terminals that have accessed the target base station in the past, and the target base station may obtain the first initial transmit power according to the historical information.

The second information includes one or more of downlink measurement result information between the second terminal and the target base station and location information of the second terminal, and the second initial transmit power is the difference between the second terminal and the target base station. Initial transmit power for uplink transmission.

Optionally, the target base station may acquire the second information when communicating with the second terminal. For example, the second terminal may have established a communication connection with the target base station, and the second terminal may report the relationship between the second terminal and the target base station to the target base station. One or more of downlink measurement result information and location information of the second terminal.

Optionally, the target base station may acquire the initial transmit power of the second terminal during the random access process of the second terminal, or the target base station may acquire the initial transmit power of the second terminal after performing RRC connection with the second terminal.

Optionally, in the second implementation manner, the second terminal may be one or more terminals, and the mapping relationship between the second information and the second timing advance can be understood as a plurality of second information and a plurality of second information. The mapping relationship between timing advances, such as one-to-one, one-to-many, or many-to-one, is not limited in this embodiment of the present application.

Optionally, the second terminal may include the first terminal, for example, the first terminal first communicates with the target base station, then switches to another base station, and then switches from the other base station to the target base station, where the second information may include the first terminal number of the first terminal. One or more of the downlink measurement result information and the location information of the second terminal when communicating with the target base station once, where the second initial transmit power can be understood as the first time when the first terminal communicates with the target base station The initial transmit power of the uplink transmission.

During the handover process in this embodiment of the present application, parameters for communicating between the first terminal and the target base station can be determined in advance, such as timing advance and initial transmit power, and the first terminal can skip the random access process to perform uplink data transmission with the target base station , reducing signaling overhead and data transmission delay.

FIG. 3 is a schematic flowchart of the communication method 300 of the present application, and the embodiment shown in FIG. 3 can be regarded as a further description of the first example of the first implementation in the embodiment shown in FIG. 2 . Hereinafter, a communication method 300 provided by an embodiment of the present application will be described with reference to FIG. 3 . The method 300 includes:

In step 310, the source base station sends measurement configuration information (for example, RRC reconfiguration information) to the first terminal, which may include parameters such as measurement objects, report configurations, and measurement identifiers.

In step 311, the first terminal measures a series of cells according to the measurement configuration information, and forms a measurement report. The measurement report can report various events to the source base station, such as the signal strength of the current serving cell is lower than a certain threshold and the target cell The signal strength is above a certain threshold.

In step 312, the first terminal sends a measurement report to the source base station, where the measurement report includes measurement results of a series of cells by the first terminal. Specifically, the measurement on a series of cells may refer to: measurement on downlink signals (eg, reference signals) from cells (specifically, sent by an access device providing the cells).

For example, the measurement result may include any one or more parameters of the reference signal received power, the signal-to-noise ratio, the received signal strength indication or the reference signal received quality of each cell.

In step 313, the source base station determines whether the serving base station of the first terminal needs to be switched according to the measurement result, and may further determine the target cell of the first terminal, and the base station to which the target cell belongs is determined as the target base station.

For example, when it is determined that the signal strength of the current serving cell is lower than a certain threshold, and the signal strength of a certain neighboring cell is higher than a certain threshold, the source base station makes a handover decision, and can determine the neighboring cell as the first terminal The target cell to be handed over is determined at the same time, and the base station to which the adjacent cell belongs is determined to be the target base station to be handed over. In this case, the source base station may send a handover request message to the target base station.

In step 320, the source base station sends a handover request message to the target base station, where the handover request message carries downlink measurement result information between the first terminal and the target base station.

The first timing advance can be determined according to the measurement result information. For example, the measurement result information may include information about the received power of the reference signal of the target cell measured by the first terminal.

Specifically, the measurement report includes the measurement results of the terminal equipment on a series of cells. After the source base station determines the target cell (for example, the cell with the best signal can be determined as the target cell), the reference signal of the target cell can be obtained. receive power, and send the information of the received power of the reference signal to the target base station, and the target base station can determine the first timing advance according to the information of the received power of the reference signal.

It should be understood that the information on the received power of the reference signal may also be information on the received power (beam reference signal receiving power, BRSRP) of the reference signal of a certain beam, which is not limited in this application.

Optionally, the measurement result information can also be used to determine the first initial transmit power.

Optionally, for the sending of the measurement result information, the measurement result information of the present application may also be sent independently, or may be carried in other information and sent to the target base station, which is not limited in the present application.

In step 330, the target base station determines a first timing advance according to downlink measurement result information between the first terminal and the target base station.

Optionally, the target base station receives the handover request message, and after confirming that the first terminal is allowed to access, the target base station may determine the first timing advance according to the measurement result information.

Optionally, the measurement result information may be information of the received power RSPR of the reference signal. The target base station may determine the path loss PL between the target base station and the first terminal according to the difference between the power RSP of the reference signal of the target cell and the received power RSRP of the reference signal, and determine the first terminal and the first terminal according to the path loss PL. The distance D between the target base stations.

Specifically, according to different scenarios, the target base station can select path loss formulas under different models to calculate the distance D between the first terminal and the target base station, such as free space propagation model, Okunun-Hata model or Hata model.

Further, after the distance D (unit: meters) between the first terminal and the target base station is determined, T can be calculated according to the following formula: T=2*D/c. Wherein, T is the sum of one uplink transmission time and one downlink transmission time between the first terminal and the target base station (unit: second), and c is the electromagnetic wave propagation speed (unit: m/s).

After T is obtained, it is easy to obtain the timing advance TA by converting according to the definition of the timing advance.

For example, the unit of TA may be 16Ts, 1Ts=1/(15000*2048) (unit: second), and the value of TA is an integer between 0 and 1282. The timing advance TA is the first timing advance.

Optionally, the first initial transmit power may also be determined according to the received power information of the reference signal.

Specifically, the target base station may determine the path loss PL between the target base station and the first terminal according to the difference between the reference signal power RSP and the reference signal received power RSRP, and determine the path loss PL between the target base station and the first terminal according to the path loss PL and the power expected to be received by the target base station (target The sum of received power, TRP) obtains the first initial transmit power ITP.

In step 340, the target base station sends a handover confirmation message to the source base station, where the handover confirmation message includes the information of the first timing advance.

In step 350, the source base station sends a handover command message to the first terminal, where the handover command message includes information of the first timing advance.

In steps 340 and 350, since an RRC connection has not been established between the first terminal and the target base station, the target base station may send the information of the first timing advance to the first terminal through the source base station. Specifically, after confirming that the access of the first terminal is allowed and determining the first timing advance, the target base station sends a handover confirmation message to the source base station, where the handover confirmation message may include the information of the first timing advance. After receiving the information of the first timing advance, the source base station sends a handover command message to the first terminal, where the handover command message may include the information of the first timing advance. Steps 340 and 350 can be understood as the target base station sending the first timing advance information to the first terminal through the source base station.

The content contained in the handover command message (for example, it may be an RRC reconfiguration message) may come from the handover confirmation message.

It should be understood that the information of the first timing advance can also be sent to the source base station and/or the first terminal separately, or can also be carried in other messages and sent to the source base station and/or the first terminal, and this application does not limited.

Optionally, the target base station may also send the information of the first initial transmit power to the first terminal through the source base station. For example, the information of the first initial transmit power may be carried in the handover confirmation message and the handover command message.

In addition, the information of the first initial transmit power can also be sent to the source base station and/or the first terminal separately, or can also be carried in other messages and sent to the source base station and/or the first terminal, which is not limited in this application .

Optionally, the handover command message may further include a synchronization signal and PBCH block index (SSB index).

Specifically, in the 5G system, due to the use of high-frequency transmission, the energy of the wave is easily lost during the propagation process. If it is sent in all directions like the 4G system, it will waste a lot of energy, and the effect is not good. Therefore, a new feature of beamforming is introduced in the 5G system, that is, the antenna sends signals in a fixed direction. Generally, the synchronization signal block index may be carried in the random access configuration in the handover command message, and the terminal device determines the sending direction of the signal according to the synchronization signal block index. However, in the technical solution of the present application, the random access configuration is not included in the handover command message, so the synchronization signal block index can be separately carried in the handover command message.

In addition, the synchronization signal block index may also be sent to the first terminal separately, or carried in other messages and sent to the first terminal, which is not limited in this application.

In step 360, the first terminal receives the handover command message, and performs uplink data transmission with the target base station according to the information of the first timing advance in the handover command message.

The first terminal may perform uplink data transmission with the target cell based on the first timing advance, for example, send an RRC reconfiguration complete message to the target base station through the target cell.

In addition, the first terminal may also determine a signal sending direction according to the synchronization signal block index in the handover command message, and send a data signal to the direction, so as to perform uplink data transmission with the target cell.

Optionally, the first terminal may perform uplink data transmission with the target base station based on the first timing advance and the first initial transmit power.

Optionally, if the handover command message does not include the information of the first initial transmit power, the first terminal can calculate the first initial transmit power by itself. For example, the first terminal may determine the path loss PL between the target base station and the first terminal according to the difference between the reference signal power RSP and the reference signal received power RSRP, and according to the difference between the path loss PL and the power TRP expected by the target base station to receive and obtain the first initial transmit power ITP.

Optionally, if the uplink data transmission fails (for example, the number of times of failure of hybrid automatic repeat request (HARQ) reaches the upper limit N times), the first terminal can enter the random access procedure, that is, the first terminal can enter the random access procedure at this time. Initiate random access to the target base station, so as to avoid increasing the delay.

In this embodiment of the present application, the target base station can determine the first timing advance and the first initial transmit power, and send the above-mentioned related information to the first terminal, and the first terminal can skip the random access procedure (the random access procedure It takes about tens of milliseconds), and the above-mentioned relevant parameters are directly used to establish a connection with the target base station, and perform uplink data transmission, thereby reducing signaling overhead, reducing delay, and improving user experience. In addition, the embodiment of the present application also shows a good fallback mechanism, when the uplink transmission fails, the first terminal can be allowed to fallback to the random access procedure, which can avoid increasing the delay.

FIG. 4 is a schematic flowchart of the communication method 400 of the present application, and the embodiment shown in FIG. 4 can be regarded as a further description of the second example of the first implementation in the embodiment shown in FIG. 2 . The following describes a communication method 400 provided by an embodiment of the present application with reference to FIG. 4 , and the method 400 includes:

In step 410, the source base station sends measurement configuration information to the first terminal, where the measurement configuration information carries second indication information, and the second indication information is used to instruct the first terminal to report its own location information.

In step 411, the first terminal measures a series of cells according to the measurement configuration information, and forms a measurement report. At the same time, the first terminal also determines its own location and generates its own location information.

In step 412, the first terminal sends a measurement report to the source base station, where the measurement report includes the location information of the first terminal.

In step 413, the source base station determines whether the serving base station of the first terminal needs to be switched according to the measurement result, determines the target cell of the first terminal, and determines the base station to which the target cell belongs as the target base station.

The above steps 410 , 411 , 412 , and 413 can be understood with reference to the steps 310 , 311 , 312 , and 313 in the method 300 , and the differences are described here.

In this embodiment, the measurement configuration information sent by the source base station to the first terminal further includes second indication information, where the second indication information is used to instruct the first terminal to report its own location information to the source base station, and the first terminal is receiving After reaching the measurement configuration information carrying the second indication information, not only starts to perform measurement, but also determines its current location, and carries the location information in the measurement report, and reports it to the source base station together.

Optionally, the second indication information may be a series of specific codes, or a bit of 0 or 1, or be distinguished by NULL and non-NULL, according to the provisions of the protocol or the system.

The above describes that the second indication information is carried in the measurement configuration information. It should be understood that the second indication information may be carried by other messages in the prior art, or the source base station may send the second indication information to the first terminal alone. This application This is not limited.

In step 420, the source base station sends a handover request message to the target base station, where the handover request message carries the location information of the first terminal.

Specifically, the source base station may acquire the location of the first terminal, and send the location information to the target base station, and may determine the first timing advance according to the location information of the first terminal. For example, the location of the first terminal may be the current location of the first terminal.

Optionally, the location information can also be used to determine the first initial transmit power.

Optionally, for the sending of the location information, the measurement result information of the present application may also be sent independently, or may be carried in other information and sent to the target base station, which is not limited in the present application.

In step 430, the target base station determines a first timing advance according to the location information of the first terminal.

Specifically, the target base station receives the handover request message, and after confirming that the access of the first terminal is allowed, the target base station may determine the first timing advance according to the location information.

The target base station may determine the distance D between the location of the first terminal and its own location according to the location of the first terminal.

Further, after the distance D (unit: meters) between the first terminal and the target base station is determined, T can be calculated according to the following formula: T=2*D/c. Wherein, T is the sum of one uplink transmission time and one downlink transmission time between the first terminal and the target base station (unit: second), and c is the electromagnetic wave propagation speed (unit: m/s).

After T is obtained, it is easy to obtain the timing advance TA by converting according to the definition of the timing advance.

For example, the unit of TA may be 16Ts, 1Ts=1/(15000*2048) (unit: second), and the value of TA is an integer between 0 and 1282. The timing advance TA is the first timing advance.

Optionally, the target base station may further determine the first initial transmit power according to the location information of the first terminal.

The target base station can determine the distance D between the first terminal and its own position according to the position of the first terminal. According to different scenarios, the target base station can select the path loss formula under different models to calculate the path between the first terminal and the target base station. Loss PL, such as free space propagation model, Okumura-Hata model or Hata model, etc. Then, the first initial transmit power ITP is obtained according to the sum of the path loss PL and the power TRP expected to be received by the target base station.

In step 440, the target base station sends a handover confirmation message to the source base station, where the handover confirmation message includes the information of the first timing advance.

In step 450, the source base station sends a handover command message to the first terminal, where the handover command message includes information of the first timing advance.

In step 460, the first terminal receives the handover command message, and performs uplink data transmission with the target base station according to the information of the first timing advance in the handover command message.

For the above steps 440 , 450 and 460 , reference may be made to steps 340 , 350 and 360 in the method 200 , and details are not repeated here.

It should be understood that the method 400 provided in this embodiment may also be used in combination with the aforementioned method 300. Specifically, the first timing advance may be jointly determined according to the two timing advances calculated by the method 400 and the method 300. For example, the first timing advance may be determined by The average value of the two is determined as the first timing advance, or on the basis of the two timing advances calculated by the method 400 and the method 300, the first timing advance is obtained through other algorithms, which is not limited in this embodiment of the present application .

FIG. 5 is a schematic flowchart of the communication method 500 of the present application, and the embodiment shown in FIG. 5 can be regarded as a further description of the second implementation manner in the embodiment shown in FIG. 2 . Below, a communication method 500 provided by an embodiment of the present application is described with reference to FIG. 5 . The method 500 includes:

In step 510, the source base station sends measurement configuration information to the first terminal.

In step 511, the first terminal measures a series of cells according to the measurement configuration information, and forms a measurement report.

In step 512, the first terminal sends the measurement report to the source base station.

In step 513, the source base station determines whether the serving base station of the first terminal needs to be switched according to the measurement result, determines the target cell of the first terminal, and determines the base station to which the target cell belongs as the target base station.

In step 520, the source base station sends a handover request message to the target base station, where the handover request message carries the first information.

The above steps 510 , 511 , 512 , 513 , and 520 can be understood with reference to steps 310 , 311 , 312 , 313 , and 320 in the method 300 , and details are not repeated here.

In step 530, the target base station determines a first timing advance according to the first information and the mapping relationship.

Specifically, the target base station may first obtain a mapping relationship, where the mapping relationship is a mapping relationship between the second information and the second timing advance, and the second information includes downlink measurement result information between the second terminal and the target base station and one or more of the location information of the second terminal, the second timing advance is the timing advance of the uplink transmission between the second terminal and the target base station; according to the mapping relationship and the first information, determine the first timing advance amount.

The second terminal may be a terminal device that has established a connection with the target base station, and the second timing advance may be a timing advance used by the second terminal to successfully perform uplink data transmission with the target base station.

Optionally, the second terminal may be one or more terminals, and the mapping relationship between the second information and the second timing advance can be understood as the mapping relationship between multiple second information and multiple second timing advances. , for example, one-to-one, one-to-many, or many-to-one, which is not limited in this embodiment of the present application.

Optionally, the target base station may generate the mapping relationship according to the correspondence between multiple pieces of second information reported by the second terminal and multiple pieces of information about the second timing advance. The reporting of the corresponding relationship by the second terminal may further include that the second terminal reports the corresponding relationship through other base stations.

Optionally, the target base station may send indication information to the connected second terminals (for example, the indication information may be broadcast to each second terminal), where the indication information is used to instruct multiple second terminals to report the multiple second terminals. The corresponding relationship between the information and multiple second timing advance amounts. After receiving the indication information, the terminal device reports the corresponding relationship to the target base station. After receiving the above-mentioned corresponding relationship, the target base station can generate the mapping relationship according to the corresponding relationship. .

Optionally, the existing mapping relationship can also be improved according to the corresponding relationship.

Optionally, the target base station may generate the mapping relationship according to the correspondence between the locally stored second information and the second timing advance.

Optionally, the correspondence between the multiple pieces of second information and the multiple pieces of information about the second timing advance may also be obtained by the operator's drive test.

Optionally, the plurality of second pieces of information may have a one-to-one correspondence with the pieces of information about the plurality of second timing advances, and each second piece of information corresponds to each second timing advance. For example, the second information #1 may include information about the received power RSRP #1 of the reference signal measured at the location #1, or include the coordinate #1 of the location #1, and the corresponding timing advance TA#1 is at The timing advance used by the location #1 and the target base station for successful uplink data transmission.

For example, the correspondence between the multiple pieces of second information and the multiple pieces of information about the second timing advance may be the correspondence between the received power of the reference signals sent by the multiple target base stations and the multiple timing advances.

For another example, the correspondence between the multiple pieces of second information and the pieces of information about the multiple second timing advances may be the correspondence between the positions of the multiple second terminals and the multiple timing advances.

For example, referring to Table 1, the mapping relationship may exist in the form of a corresponding relationship table.

Table 1:

RSRP value RSRP#1 RSRP#2 RSRP#3 … RSRP#n Position coordinates coordinate#1 coordinate#2 coordinate#3 … coordinate#n TA value TA#1 TA#2 TA#3 … TA#n

Table 1 shows the correspondence between the received power of the n reference signals and the n TA values, and also shows the correspondence between the n position coordinates and the n TA values.

At this time, the target base station may determine the timing advance corresponding to the first information as the first timing advance according to the mapping relationship #A (that is, the correspondence table).

For example, if the parameter indicated by the first information is RSRP#1 or coordinate#1, at this time, the timing advance amount TA#1 corresponding to the first information may be determined as the first timing advance amount.

It should be understood that the scales (or parameters) in Table 1 are discrete, while the data measured by the terminal device is continuous. Therefore, the parameters indicated by the first information may not be included in the mapping relationship (that is, the Correspondence table), at this time, through a certain algorithm, the first timing advance amount can also be determined according to the mapping relationship.

For example, the parameter indicated by the first information is a parameter RSRP#1-2 between RSRP#1 and RSRP#2. At this time, TA can be calculated by a certain algorithm according to their corresponding TA#1 and TA#2. #1-2, and determine the TA#1-2 as the first timing advance.

For another example, the parameter indicated by the first information is a parameter coordinate#1-2 between coordinate#1 and coordinate#2, which can be calculated by a certain algorithm according to their corresponding TA#1 and TA#2. TA#1-2, and determine the TA#1-2 as the first timing advance.

It should be understood that the present application does not limit the algorithm for obtaining TA#1-2. As an example, the TA#1-2 can be obtained by averaging TA#1 and TA#2.

It should be understood that the above Table 1 is only used for example, and the present application does not limit the existence form of the mapping relationship #A, or the content that may exist. For example, Table 1 may only show the correspondence between the received power of n reference signals and n TA values, or only show the correspondence between n position coordinates and n TA values. In other words, in Table 1, The contents of the first line and the second line do not need to exist at the same time, and only one of the two may exist.

Optionally, the target base station may also determine the first initial transmit power according to the first information and the mapping relationship.

Specifically, the mapping relationship is the mapping relationship between the second information and the second initial transmission power, the second initial transmission power is the initial transmission power of the uplink transmission between the second terminal and the target base station, and the target base station can be based on the mapping relationship and the first information to determine the first initial transmit power.

Similarly, the generation method of the mapping relationship between the second information and the second initial transmission power is basically the same as the generation method of the mapping relationship between the second information and the second timing advance, and the first initial transmission power is determined according to the mapping relationship and the first information. The method for determining the first timing advance according to the mapping relationship and the first information is basically the same as the method for determining the first timing advance, which will not be repeated here.

It should be understood that in actual communication applications, the path losses PL of the uplink and the downlink are not the same (in the method 300 it is actually assumed that the path losses PL of the uplink and the downlink are the same). The distance between the first terminal and the target base station is calculated to obtain the first timing advance without considering the influence of obstacles that may exist between the two. Therefore, the first timing advance calculated by the method 300 and the method 400 may not be accurate enough . However, in the method 500 provided in this embodiment, the first timing advance is determined according to past empirical values, which can improve the accuracy of the result.

The methods for determining the first timing advance provided by the foregoing methods 300 , 400 and 500 may be used alone, or may be used in combination. Specifically, the first timing advance amount may be determined by one or more of the foregoing three methods.

Optionally, a plurality of timing advances may be determined by any of the foregoing three methods, and the first timing advance may be determined according to the plurality of timing advances, for example, an average value of the multiple timing advances may be obtained. The first timing advance.

Optionally, the first timing advance calculated in the methods 300 and 400 may be modified by the first timing advance determined in the method 500 .

If the first terminal successfully accesses the target base station through the first timing advance calculated in methods 300 and 400, the mapping relationship can also be improved (or corrected) by using the first timing advance calculated, for example, The corresponding relationship between the first information and the first timing advance is supplemented into the mapping relationship.

The above-mentioned FIG. 5 describes the process in which the target base station obtains the first timing advance and/or the first initial transmit power according to the mapping relationship. It should be noted that the target base station can broadcast the mapping relationship (for example, through a system message), and the first terminal can broadcast the mapping relationship. The mapping relationship is received, and then the first terminal acquires the first timing advance and/or the first initial transmit power according to the mapping relationship.

FIG. 6 is a schematic flowchart of a communication method 600 of the present application. The following describes a communication method 600 provided by an embodiment of the present application with reference to FIG. 6 , and the method 600 includes:

Step 610: The target base station generates first indication information.

The first indication information may be used to instruct the first terminal to determine the first timing advance.

Optionally, the first indication information may also be used to instruct the first terminal to determine the first initial transmit power.

Optionally, the first indication information may carry location information of the target base station.

Optionally, the first indication information may display an indication, for example, according to a protocol or a system specification, which is a series of specific codes, or a bit of 0 or 1, or differentiated by NULL and non-NULL. Alternatively, the first indication information may indicate implicitly, for example, the target base station sends the location information of the target base station to the first terminal through the source base station, and implicitly instructs the first terminal to determine the first timing advance and/or the first initial transmit power .

In the following, the first indication information is used to instruct the first terminal to determine the first timing advance or the first initial transmit power as an example. A terminal determines other parameter information of the communication between the first terminal and the target base station, which is not limited in this embodiment of the present application, and step 640 is optional.

Step 620: The target base station sends first indication information to the source base station.

Step 630: The source base station sends the first indication information to the first terminal.

Optionally, steps 620 and 630 may be understood as the target base station sending the first indication information to the first terminal through the source base station.

Step 640: The first terminal receives the first indication information, and determines the first timing advance according to the indication of the first indication information.

Optionally, the first terminal receives the first indication information, and determines the first initial transmit power according to the indication of the first indication information.

The following describes how the first terminal determines the first timing advance in step 640.

As a first implementation manner, the first terminal may determine the distance between the first terminal and the target base station, and then determine the first timing advance according to the distance between the first terminal and the target base station.

Regarding how the first terminal determines the distance between the first terminal and the target base station, several examples are provided below:

In the first example, the first terminal may determine the path loss between the target base station and the first terminal according to the downlink measurement result information between the first terminal and the target base station, and determine the path loss between the first terminal and the first terminal according to the path loss. the distance between the target base stations.

In the second example, the first terminal may determine the distance between the first terminal and the target base station according to the location information of the first terminal and the location information of the target base station.

In a third example, the first terminal may determine the distance between the first terminal and the target base station according to downlink measurement result information between the first terminal and the target base station respectively (refer to the first example for details), And determine the distance between the first terminal and the target base station according to the location information of the first terminal (specifically, refer to the second example), and then calculate the distance between the first terminal and the target base station calculated by these two implementations. Compare and select one as the distance between the first terminal and the target base station, or, on the basis of the distance between the first terminal and the target base station calculated by these two implementations, through a certain algorithm (for example, averaging) To obtain the distance between the first terminal and the target base station, the embodiment of the present application does not limit the specific algorithm.

As a second implementation manner, the first terminal may acquire the mapping relationship between the second information and the second timing advance, and then according to the mapping relationship and the downlink measurement result information between the first terminal and the target base station and/or or the location information of the first terminal to determine the first timing advance.

Optionally, the mapping relationship may be generated by the target base station and sent to the first terminal through the source base station in advance. Or, optionally, the target base station may broadcast the mapping relationship, and the first terminal may receive the system message to obtain the mapping relationship.

For the relevant content of the mapping relationship, reference may be made to the relevant description of the foregoing step 220, and details are not described herein again in this embodiment.

The following describes how the first terminal determines the first initial transmit power in step 640.

As a first implementation manner, the first terminal may determine the path loss between the first terminal and the target base station, and then determine the first initial transmit power according to the path loss between the first terminal and the target base station.

Regarding how the first terminal determines the path loss between the first terminal and the target base station, several examples are provided below:

In the first example, the first terminal may determine the path loss between the target base station and the first terminal according to the measurement result information.

In the second example, the first terminal may determine the distance between the first terminal and the target base station according to the location information of the first terminal and the location information of the target base station, and determine the first terminal according to the distance between the first terminal and the target base station. Path loss between a terminal and the target base station.

In a third example, the first terminal may determine the path loss between the first terminal and the target base station according to downlink measurement result information between the first terminal and the target base station respectively (for details, please refer to the first example) , and determine the path loss between the first terminal and the target base station according to the location information of the first terminal (for details, refer to the second example), and then calculate the path loss between the first terminal and the target base station calculated by these two implementations Compare the path losses, and select one as the path loss between the first terminal and the target base station, or, based on the path losses between the first terminal and the target base station calculated by these two implementations, use a certain algorithm (for example, averaging) to obtain the path loss between the first terminal and the target base station, and the embodiment of the present application does not limit the specific algorithm.

As a second implementation manner, the first terminal may acquire the mapping relationship between the second information and the second initial transmit power, and then according to the mapping relationship and the downlink measurement result information between the first terminal and the target base station and/or or the location information of the first terminal to determine the first initial transmit power.

Optionally, the mapping relationship may be generated by the target base station and sent to the first terminal through the source base station in advance.

For the relevant content of the mapping relationship, reference may be made to the relevant description of the foregoing step 220, and details are not described herein again in this embodiment.

In this embodiment, during the handover process, the first terminal can determine the parameters of the communication between the first terminal and the target base station in advance, such as timing advance and initial transmit power, and the first terminal can skip the random access process and communicate with the target base station. Perform uplink data transmission to reduce signaling overhead and data transmission delay.

FIG. 7 is a schematic flowchart of the communication method 700 of the present application, and the embodiment shown in FIG. 7 may be regarded as a further description of the embodiment shown in FIG. 6 . Hereinafter, a communication method 700 provided by an embodiment of the present application will be described with reference to FIG. 7 . The method 700 includes:

In step 710, the source base station sends measurement configuration information to the first terminal.

In step 711, the first terminal measures a series of cells according to the measurement configuration information, and forms a measurement report.

In step 712, the first terminal sends the measurement report to the source base station.

In step 713, the source base station determines whether the serving base station of the first terminal needs to be switched according to the measurement result, determines the target cell of the first terminal, and determines the base station to which the target cell belongs as the target base station.

The above steps 710 , 711 , 712 , and 713 can be understood with reference to steps 310 , 311 , 312 , and 313 in the method 300 , and details are not repeated here.

In step 720, the source base station sends a handover request message to the target base station.

In step 730, the target base station generates first indication information, where the first indication information is used to instruct the first terminal to determine the first timing advance.

Specifically, the target base station receives the handover request message, and first determines whether or not to allow the terminal device to access according to the number of its own connections, and if so, the target base station can generate first indication information, where the first indication information is used to indicate The first terminal determines a first timing advance.

Optionally, the first indication information may further instruct the first terminal to determine the first initial transmit power.

Optionally, the first indication information may carry location information of the target base station.

Optionally, the first indication information may display an indication, for example, according to a protocol or a system specification, which is a series of specific codes, or a bit of 0 or 1, or differentiated by NULL and non-NULL. Alternatively, the first indication information may indicate implicitly, for example, the target base station sends the location information of the target base station to the first terminal through the source base station, and implicitly instructs the first terminal to determine the first timing advance and/or the first initial transmit power .

In step 740, the target base station sends a handover confirmation message to the source base station, where the handover confirmation message includes the first indication information.

In step 750, the source base station sends a handover command message to the terminal device, where the handover command message includes the first indication information.

After the target base station confirms that the access of the first terminal is allowed and generates the first indication information, since the RRC connection has not been established between the first terminal and the target base station, the target base station can send the first indication to the first terminal through the source base station information. Specifically, the target base station may send a handover confirmation message to the source base station, and the handover confirmation message may include the first indication information. After receiving the first indication information, the source base station sends a handover command message to the first terminal, where the handover command message may include the first indication information.

It should be understood that the first indication information may also be sent to the source base station and/or the first terminal independently, or may be carried in other messages and sent to the source base station and/or the first terminal, which is not limited in this application.

Optionally, the target base station may also send its own location information to the first terminal through the source base station. The location information of the target base station may be carried in the handover confirmation message and the handover command message, or may also be carried in the first indication information. In addition, the location information of the target base station may also be sent to the source base station and/or the first terminal separately, or may be carried in other messages and sent to the source base station and/or the first terminal, which is not limited in this application.

In step 751, the first terminal receives the first indication information, and determines the first timing advance.

Optionally, the first terminal may determine the first timing advance according to downlink measurement result information between the first terminal and the target base station.

Optionally, the first terminal may determine the first initial transmit power according to downlink measurement result information between the first terminal and the target base station.

For details, reference may be made to the above-mentioned method 200 and related contents of the methods 300 and 600 , for example, the related description of steps 220 , 330 and 640 .

Optionally, the first indication information may include location information of the target base station, and the first terminal may determine the first timing advance according to the location information of the first terminal and the location information of the target base station.

Optionally, the first terminal may determine the first initial transmit power according to the location information of the first terminal and the location information of the target base station.

For details, reference may be made to the above-mentioned method 200 and related contents of the methods 400 and 600 , for example, the related descriptions of steps 220 , 430 and 640 .

Optionally, when the first terminal needs to determine the first timing advance amount according to its own position, the first terminal also needs to obtain the position of the target base station, and the target base station can send the information of its own position to the first base station in advance through the source base station. a terminal. Alternatively, the source base station itself stores the location information of the target base station, and the source base station may directly send the location information of the target base station to the first terminal. In addition, the location information of the target base station may also be pre-stored on the first terminal, which is not limited in this application.

Optionally, the first terminal may determine the first timing advance according to the downlink measurement result information and the mapping relationship between the first terminal and the target base station.

Optionally, the first terminal may determine the first initial transmit power according to the downlink measurement result information and the mapping relationship between the first terminal and the target base station.

For details, reference may be made to the above-mentioned method 200 and related contents of the methods 500 and 600 , for example, the related descriptions of steps 220 , 530 and 640 .

In step 760, the first terminal performs uplink data transmission with the target base station according to the first timing advance.

The first terminal may perform uplink data transmission with the target cell based on the first timing advance, for example, send an RRC reconfiguration complete message to the target base station through the target cell.

Optionally, the first terminal may perform uplink data transmission with the target cell based on the first timing advance and the first initial transmit power.

Wherein, if the transmission fails (for example, the number of HARQ retransmission failures reaches the upper limit of N times), the first terminal can enter the random access procedure, that is, the first terminal can initiate a random access procedure to the target base station at this time, so as to be able to Avoid adding delays.

In addition, in step 751, if the first timing advance cannot be determined because the first terminal lacks relevant parameters (eg, the location of the target base station) and other reasons, the random access procedure can be directly initiated at this time.

In this embodiment, the first terminal determines the first timing advance, and performs uplink data transmission with the target base station according to the first timing advance. In this embodiment, the first indication information may instruct the first terminal to determine the first timing advance according to the first information. In addition, it may also be stipulated by the system or the protocol that the first terminal determines the relevant parameters according to the first information. This application This is not limited.

Figures 6 to 7 above describe that the target base station instructs the first terminal to calculate the first timing advance. It should be noted that the first terminal can also be pre-defined by the communication system to calculate the first timing advance, and the target base station does not need to send instruction information. , thereby saving communication resources; or, the source base station may send the above-mentioned first indication information to the first terminal, and reference may be made to the related content in FIG. 6 to FIG. 7 .

In the above, the communication method provided by the embodiment of the present application is described in detail with reference to FIG. 2 to FIG. 7 . Hereinafter, the communication apparatus provided by the embodiments of the present application will be described in detail with reference to FIG. 8 to FIG. 10 .

FIG. 8 is a schematic structural diagram of a network device. The source base station or the target base station may refer to the structure shown in FIG. 8 .

The network device includes at least one processor 1511 , at least one memory 1512 , at least one transceiver 1513 , at least one network interface 1514 and one or more antennas 1515 . The processor 1511, the memory 1512, the transceiver 1513 and the network interface 1514 are connected, for example, via a bus. The antenna 1515 is connected to the transceiver 1513 . The network interface 1514 is used to connect the network device with other communication devices through a communication link. In this embodiment of the present application, the connection may include various types of interfaces, transmission lines, or buses, which are not limited in this embodiment.

The memory 1512 may exist independently and be connected to the processor 1511 . Optionally, the memory 1512 can also be integrated with the processor 1511, for example, in one chip. The memory 1512 can store program codes for implementing the technical solutions of the embodiments of the present application, and is controlled and executed by the processor 1511 . For example, the processor 1511 is configured to execute the computer program codes stored in the memory 1512, thereby implementing the technical solutions in the embodiments of the present application.

The transceiver 1513 may be used to support the reception or transmission of radio frequency signals between the network device and the terminal, and the transceiver 1513 may be connected to the antenna 1515 . The transceiver 1513 includes a transmitter Tx and a receiver Rx. Specifically, one or more antennas 1515 can receive radio frequency signals, and the receiver Rx of the transceiver 1513 is used to receive the radio frequency signals from the antennas, convert the radio frequency signals into digital baseband signals or digital intermediate frequency signals, and convert the digital The baseband signal or digital intermediate frequency signal is provided to the processor 1511, so that the processor 1511 performs further processing on the digital baseband signal or digital intermediate frequency signal, such as demodulation processing and decoding processing. In addition, the transmitter Tx in the transceiver 1513 is also used to receive the modulated digital baseband signal or digital intermediate frequency signal from the processor 1511, and convert the modulated digital baseband signal or digital intermediate frequency signal into a radio frequency signal, and pass a The radio frequency signal is transmitted by the antenna or antennas 1515. Specifically, the receiver Rx can selectively perform one or more stages of down-mixing processing and analog-to-digital conversion processing on the radio frequency signal to obtain a digital baseband signal or a digital intermediate frequency signal. The order of precedence is adjustable. The transmitter Tx can selectively perform one or more stages of up-mixing processing and digital-to-analog conversion processing on the modulated digital baseband signal or digital intermediate frequency signal to obtain a radio frequency signal, and the up-mixing processing and digital-to-analog conversion processing The sequence of s is adjustable. Digital baseband signals and digital intermediate frequency signals can be collectively referred to as digital signals.

FIG. 9 is a schematic structural diagram of a terminal device according to an embodiment of the present application. For the structure of the first terminal, reference may be made to the structure shown in FIG. 9 .

The terminal includes at least one processor 1611 , at least one transceiver 1612 and at least one memory 1613 . The processor 1611, the memory 1613 and the transceiver 1612 are connected. Optionally, the terminal may also include an output device 1614 , an input device 1615 and one or more antennas 1616 . The antenna 1616 is connected to the transceiver 1612 , and the output device 1614 and the input device 1615 are connected to the processor 1611 .

The transceiver 1612, the memory 1613 and the antenna 1616 can refer to the related description in FIG. 8 to achieve similar functions.

The processor 1611 may be a baseband processor or a CPU, and the baseband processor and the CPU may be integrated or separated.

The processor 1611 can be used to implement various functions for the terminal, for example, to process communication protocols and communication data, or to control the entire terminal device, execute software programs, and process data of software programs; or to assist in completing Computational processing tasks, such as graphic image processing or audio processing, etc.; or the processor 1211 is used to implement one or more of the above functions

The output device 1614 is in communication with the processor 1611 and can display information in a variety of ways. For example, the output device 1214 may be a Liquid Crystal Display (LCD), a Light Emitting Diode (LED) display device, a Cathode Ray Tube (CRT) display device, or a projector (projector), etc. . Input device 1615 is in communication with processor 1611 and can accept user input in a variety of ways. For example, the input device 1615 may be a mouse, a keyboard, a touch screen device, a sensor device, or the like.

FIG. 10 is a schematic structural diagram of a communication apparatus 1200 according to an embodiment of the present application.

The communication device 1200 includes a processing unit 1201 and a communication unit 1202 . Optionally, the communication device 1200 further includes a storage unit 1203 . The processing unit 1201, the communication unit 1202 and the storage unit 1203 are connected through a communication bus.

The communication unit 1202 may be a device with a transceiving function, and is used to communicate with other network devices or terminals.

The storage unit 1203 may include one or more memories.

The storage unit 1203 can exist independently, and is connected to the processing unit 1201 through a communication bus. The storage unit 1203 may also be integrated with the processing unit 1201 .

The communication apparatus 1200 may be used in a communication device, circuit, hardware component or chip.

The communication apparatus 1200 may be a source base station or a target base station in this embodiment of the present application. A schematic diagram of the source base station or the target base station may be as shown in FIG. 8 . Optionally, the communication unit 1202 of the communication apparatus 1200 may include an antenna and a transceiver of a network device, such as the antenna 1515 and the transceiver 1513 in FIG. 8 . Communication unit 1202 may also include a network interface of a network device, such as network interface 1514 in FIG. 8 .

The communication apparatus 1200 may be a chip in the source base station or a chip in the target base station in the embodiment of the present application. The communication unit 1202 may be an input or output interface, a pin or a circuit, or the like. Optionally, the storage unit 1203 may store computer execution instructions of the method on the network device side, so that the processing unit 1201 executes the method on the network device side in the foregoing embodiments. The storage unit 1203 can be a register, cache or RAM, etc., and the storage unit 1203 can be integrated with the processing unit 1201; the storage unit 1203 can be a ROM or other types of static storage devices that can store static information and instructions, and the storage unit 1203 can be combined with The processing unit 1201 is independent. Optionally, with the development of wireless communication technology, the transceiver may be integrated on the communication device 1200 , for example, the communication unit 1202 integrates the transceiver 1513 and the network interface 1514 .

The communication apparatus 1200 may be the first terminal in this embodiment of the present application. Optionally, the communication unit 1202 of the communication apparatus 1200 may include an antenna and a transceiver of the terminal, such as the antenna 1616 and the transceiver 1612 in FIG. 9 . Optionally, the communication unit 1202 may further include an output device and an input device, such as the output device 1614 and the input device 1615 in FIG. 9 .

The communication apparatus 1200 may be a chip in the first terminal in this embodiment of the present application. The communication unit 1202 may be an input or output interface, a pin or a circuit, or the like. Optionally, the storage unit 1203 may store computer execution instructions of the method on the terminal side, so that the processing unit 1201 executes the method of the first terminal in the foregoing embodiment. The storage unit 1203 can be a register, cache or RAM, etc., and the storage unit 1203 can be integrated with the processing unit 1201; the storage unit 1203 can be a ROM or other types of static storage devices that can store static information and instructions, and the storage unit 1203 can be combined with The processing unit 1201 is independent. Optionally, with the development of wireless communication technology, the transceiver may be integrated on the communication device 1200 , for example, the communication unit 1202 integrates the transceiver 1212 .

When the communication device 1200 is a target base station or a chip in the target base station, the processing unit 1201 can complete the action of the target base station processing in the above method, the storage unit 1203 can complete the action stored in the above method, and the communication unit 1202 can complete the above method and The actions that the source base station or the first terminal interacts with are exemplarily described below:

The communication unit 1202 may receive first information from the source base station, where the first information includes one or more of downlink measurement result information between the first terminal and the target base station and location information of the first terminal. It is used to determine the first timing advance, where the first timing advance is the timing advance of uplink transmission between the first terminal and the target base station; the communication unit 1202 may send the information of the first timing advance to the first terminal.

Optionally, the processing unit 1203 may determine the distance between the first terminal and the target base station according to the first information; and determine the first timing advance according to the distance between the first terminal and the target base station.

Optionally, when the first information includes measurement result information, the processing unit 1203 may determine the path loss between the target base station and the first terminal according to the measurement result information; determine the path loss between the first terminal and the target base station according to the path loss. the distance.

Optionally, the processing unit 1203 may acquire the mapping relationship, and the content of the mapping relationship may refer to the content in other embodiments, and the processing unit 1203 determines the first timing advance according to the mapping relationship and the first information.

Optionally, the communication unit 1202 may receive an RRC reconfiguration complete message from the first terminal, where the RRC reconfiguration complete message is transmitted based on the first timing advance.

Optionally, the first information is further used to determine the initial transmit power of uplink transmission between the first terminal and the target base station, and the communication unit 1202 may send the information of the initial transmit power to the first terminal through the source base station.

When the communication device 1200 is the first terminal or a chip in the first terminal, the processing unit 1201 can complete the action of processing the first terminal in the above method, the storage unit 1203 can complete the action of storing the first terminal in the above method, and the communication unit 1202 The actions of interacting with the source base station or the target base station in the above method can be completed, and an exemplary description is given below:

The communication unit 1202 may receive the timing advance of the uplink transmission between the first terminal and the target base station from the target base station through the source base station, wherein the timing advance is determined according to the first information, and the first information includes the difference between the first terminal and the target base station. One or more of the measurement result information of the downlink between the two terminals and the location information of the first terminal.

Optionally, the communication unit 1202 may send an RRC reconfiguration complete message to the target base station, where the RRC reconfiguration complete message is transmitted based on a timing advance.

Optionally, if the sending of the RRC reconfiguration complete message fails, the processing unit 1201 may initiate a random access procedure to the target base station.

Optionally, the communication unit 1202 may receive, from the target base station through the source base station, information about the initial transmit power of uplink transmission between the first terminal and the target base station, where the initial transmit power is determined according to the first information.

When the communication device 1200 is the source base station or a chip in the source base station, the processing unit 1201 can complete the action of the source base station processing in the above method, the storage unit 1203 can complete the action stored in the above method, and the communication unit 1202 can complete the above method and The actions that the target base station or the first terminal interacts with are exemplarily described below:

The communication unit 1202 may send first information to the target base station, where the first information is used to determine the timing advance of uplink transmission between the first terminal and the target base station, and the first information includes the downlink information between the first terminal and the target base station. One or more of the measurement result information and the location information of the first terminal; the communication unit 1202 may receive the timing advance information from the target base station; the communication unit may send the timing advance information to the first terminal.

Optionally, the communication unit 1202 may receive from the target base station information about the initial transmit power of uplink transmission between the first terminal and the target base station, where the initial transmit power is determined according to the first information; the communication unit 1202 may send the first terminal to Send initial transmit power information.

FIG. 11 is a schematic block diagram of a network device 1700 according to an embodiment of the present application. As shown in Figure 11, the network device 1700 includes:

a receiving unit 1710, configured to receive first information from the source base station, where the first information includes one or more of downlink measurement result information between the first terminal and the network device 1700 and location information of the first terminal, The first information is used to determine a first timing advance, where the first timing advance is a timing advance for uplink transmission between the first terminal and the network device 1700;

The sending unit 1720 is configured to send the information of the first timing advance to the first terminal.

Optionally, the network device 1700 further includes a determining unit 1730 for:

The distance between the first terminal and the network device 1700 is determined according to the first information; the first timing advance is determined according to the distance between the first terminal and the network device 1700 .

Optionally, when the first information includes measurement result information, the determining unit 1730 is further configured to determine the path loss between the network device 1700 and the first terminal according to the measurement result information; determine the distance between the first terminal and the network device 1700 according to the path loss. distance between.

Optionally, the determining unit 1730 may be configured to obtain a mapping relationship, and the content of the mapping relationship may refer to the contents in other embodiments, and the determining unit 1730 may be configured to determine the first timing advance according to the mapping relationship and the first information.

Optionally, the receiving unit 1710 is further configured to receive an RRC reconfiguration complete message from the first terminal, where the RRC reconfiguration complete message is transmitted based on the first timing advance.

Optionally, the first information is further used to determine the initial transmit power of uplink transmission between the first terminal and the network device 1700, and the sending unit 1720 is further used to send the information of the initial transmit power to the first terminal through the source base station.

The units in the network device 1700 in the embodiments of the present application and the above-mentioned other operations or functions are respectively to implement the corresponding processes performed by the target base station in the above-mentioned embodiments. For brevity, details are not repeated here.

FIG. 12 is a schematic block diagram of a terminal device 1800 according to an embodiment of the present application. As shown in FIG. 12, the terminal device 1800 includes a receiving unit 1810 for:

receiving from the target base station the timing advance of the uplink transmission between the terminal device 1800 and the target base station through the source base station;

The timing advance is determined according to first information, and the first information includes one or more of downlink measurement result information between the terminal device 1800 and the target base station and location information of the first terminal.

Optionally, the measurement result information includes information on the received power of the reference signal.

Optionally, the timing advance information is carried in the handover confirmation message and the handover command message.

Optionally, the terminal device 1800 further includes a sending unit 1820, configured to send an RRC reconfiguration complete message to the target base station, where the RRC reconfiguration complete message is transmitted based on the timing advance.

Optionally, if the sending of the RRC reconfiguration complete message fails, the sending unit 1820 is further configured to initiate random access to the target base station.

Optionally, the receiving unit 1810 is further configured to receive, from the target base station through the source base station, information about the initial transmit power of uplink transmission between the terminal device 1800 and the target base station, where the initial transmit power is determined according to the first information.

The units in the terminal device 1800 in the embodiments of the present application and the other operations or functions described above are respectively to implement the corresponding processes performed by the first terminal in the above embodiments. For brevity, details are not repeated here.

FIG. 13 is a schematic block diagram of a network device 1900 according to an embodiment of the present application. As shown in Figure 13, the network device 1900 includes:

The sending unit 1910 is configured to send first information to the target base station, where the first information is used to determine the timing advance of uplink transmission between the first terminal and the target base station, and the first information includes the timing advance between the first terminal and the target base station. One or more of downlink measurement result information and location information of the first terminal;

a receiving unit 1920, configured to receive timing advance information from the target base station;

The sending unit 1910 is further configured to send the timing advance information to the first terminal.

Optionally, the measurement result information includes information on the received power of the reference signal.

Optionally, the timing advance information is carried in the handover confirmation message and the handover command message.

Optionally, the receiving unit 1920 is further configured to receive from the target base station information about the initial transmit power of uplink transmission between the first terminal and the target base station, where the initial transmit power is determined according to the first information;

The sending unit 1910 is further configured to send the information of the initial transmit power to the first terminal.

The units in the network device 1900 in the embodiments of the present application and the above-mentioned other operations or functions are respectively to implement the corresponding processes performed by the source base station in the above-mentioned embodiments. For brevity, details are not repeated here.

The processor in this application may include, but is not limited to, at least one of the following: a central processing unit (CPU), a microprocessor, a digital signal processor (DSP), a microcontroller (MCU), or artificial intelligence Processors and other types of computing devices that run software, each computing device may include one or more cores for executing software instructions to perform operations or processing. The processor can be a separate semiconductor chip, or can be integrated with other circuits into a semiconductor chip. For example, it can form a SoC (on-chip) with other circuits (such as codec circuits, hardware acceleration circuits, or various bus and interface circuits). system), or can also be integrated in the ASIC as a built-in processor of an ASIC, and the ASIC integrated with the processor can be packaged separately or can be packaged with other circuits. In addition to a core for executing software instructions to perform operations or processing, the processor may further include necessary hardware accelerators, such as field programmable gate array (FPGA), PLD (programmable logic device) , or a logic circuit that implements dedicated logic operations.

In the implementation process, each step of the above-mentioned method can be completed by a hardware integrated logic circuit in a processor or an instruction in the form of software. The steps of the methods disclosed in conjunction with the embodiments of the present application may be directly embodied as executed by a hardware processor, or executed by a combination of hardware and software modules in the processor. The software modules may be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other storage media mature in the art. The storage medium is located in the memory, and the processor reads the information in the memory, and completes the steps of the above method in combination with its hardware. To avoid repetition, detailed description is omitted here.

It should be noted that the processor in this embodiment of the present application may be an integrated circuit chip, which has a signal processing capability. In the implementation process, each step of the above method embodiments may be completed by a hardware integrated logic circuit in a processor or an instruction in the form of software. The aforementioned processors may be general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components . The methods, steps, and logic block diagrams disclosed in the embodiments of this application can be implemented or executed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied as executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules may be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other storage media mature in the art. The storage medium is located in the memory, and the processor reads the information in the memory, and completes the steps of the above method in combination with its hardware.

The memory in the embodiments of the present application may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable memory Except programmable read-only memory (electrically EPROM, EEPROM) or flash memory. Volatile memory may be random access memory (RAM), which acts as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM) ), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDRSDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (synchlink DRAM, SLDRAM) and Direct memory bus random access memory (direct rambusRAM, DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but not be limited to, these and any other suitable types of memory.

According to the method provided by the embodiment of the present application, the present application also provides a computer program product, the computer program product includes: computer program code, when the computer program code is run on a computer, the computer is made to execute the programs shown in FIGS. 2-6 . The method of any one of the embodiments.

According to the methods provided by the embodiments of the present application, the present application further provides a computer-readable medium, where program codes are stored in the computer-readable medium, and when the program codes are run on a computer, the computer is made to execute the programs shown in FIGS. 2-6 . The method of any one of the embodiments.

According to the method provided by the embodiment of the present application, the present application further provides a system, which includes the aforementioned one or more terminal devices and one or more network devices.

In the above-mentioned embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented in software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer may be a general purpose computer, special purpose computer, computer network, or other programmable device. The computer instructions may be stored in or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server or data center Transmission to another website site, computer, server, or data center by wire (eg, coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that includes an integration of one or more available media. The available media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, high-density digital video discs (DVDs)), or semiconductor media (eg, solid state discs, SSD)) etc.

The network equipment in each of the above apparatus embodiments completely corresponds to the terminal equipment and the network equipment or terminal equipment in the method embodiments, and corresponding steps are performed by corresponding modules or units. For the sending step, other steps except sending and receiving may be performed by a processing unit (processor). For functions of specific units, reference may be made to corresponding method embodiments. The number of processors may be one or more.

The terms "component", "module", "system" and the like are used in this specification to refer to a computer-related entity, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component may be, but is not limited to, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a computing device and the computing device may be components. One or more components may reside within a process and/or thread of execution, and a component may be localized on one computer and/or distributed between two or more computers. In addition, these components can execute from various computer readable media having various data structures stored thereon. A component may, for example, be based on a signal having one or more data packets (eg, data from two components interacting with another component between a local system, a distributed system, and/or a network, such as the Internet interacting with other systems via signals) Communicate through local and/or remote processes.

Those of ordinary skill in the art will appreciate that the various illustrative logical blocks and steps described in connection with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware accomplish. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described systems, devices and units may refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, removable hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program codes .

It should be noted that, in the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations, or illustrations. Any embodiment or design described in the embodiments of the present application as "exemplary" or "such as" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present the related concepts in a specific manner.

In this application, "at least one" means one or more. "Plural" means two or more. "And/or", which describes the association relationship of the associated objects, indicates that there can be three kinds of relationships, for example, A and/or B, which can indicate: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A, B can be singular or plural. The character "/" generally indicates that the associated objects are an "or" relationship. "At least one item(s) below" or similar expressions thereof refer to any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (a) of a, b, or c can represent: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, c may be single or multiple . In addition, in order to clearly describe the technical solutions of the embodiments of the present application, in the embodiments of the present application, words such as "first" and "second" are used to distinguish the same or similar items with basically the same function and effect. Those skilled in the art can understand that the words "first", "second" and the like do not limit the quantity and execution order, and the words "first", "second" and the like are not necessarily different.

In this application, the first and the second only serve to distinguish, and do not constitute a limitation, and the first and the second can be interchanged.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this. should be covered within the scope of protection of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (20)

1. A communication method, characterized in that the method comprises: Receive first information from the source base station, the first information includes one or more of downlink measurement result information between the first terminal and the target base station and location information of the first terminal, the first information One piece of information is used to determine a first timing advance, where the first timing advance is a timing advance for uplink transmission between the first terminal and the target base station; The information of the first timing advance is sent to the first terminal through the source base station. 2. The method according to claim 1, wherein the method further comprises: determining the distance between the first terminal and the target base station according to the first information; The first timing advance is determined according to the distance between the first terminal and the target base station. 3 . The method according to claim 2 , wherein when the first information includes the measurement result information, the determining between the first terminal and the target base station according to the first information is performed. 4 . The distance includes: determining the path loss between the target base station and the first terminal according to the measurement result information; The distance between the first terminal and the target base station is determined according to the path loss. 4. The method according to claim 1, wherein the method further comprises: Obtain a mapping relationship, where the mapping relationship is a mapping relationship between second information and a second timing advance, and the second information includes downlink measurement result information and all the information about the downlink between the second terminal and the target base station. one or more of the location information of the second terminal, the second timing advance is the timing advance of the uplink transmission between the second terminal and the target base station; The first timing advance is determined according to the mapping relationship and the first information. 5. The method according to any one of claims 1-4, wherein the measurement result information comprises information of received power of a reference signal. 6. The method according to any one of claims 1-5, wherein the first information is carried in a handover request message, and the information of the first timing advance is carried in a handover confirmation message and a handover command in the message. 7. The method according to any one of claims 1-6, wherein the method further comprises: A radio resource control RRC reconfiguration complete message is received from the first terminal, the RRC reconfiguration complete message being transmitted based on the first timing advance. 8. The method according to any one of claims 1-7, wherein the first information is further used to determine the initial transmit power of uplink transmission between the first terminal and the target base station; the The method also includes: Send the information of the initial transmit power to the first terminal through the source base station. 9. A communication method, characterized in that the method comprises: receiving, from the target base station by the source base station, the timing advance of the uplink transmission between the first terminal and the target base station; The timing advance is determined according to first information, and the first information includes downlink measurement result information between the first terminal and the target base station and location information of the first terminal one or more of them. 10. The method according to claim 9, wherein the measurement result information comprises information of received power of a reference signal. The method according to claim 9 or 10, wherein the information of the timing advance is carried in a handover confirmation message and a handover command message. 12. The method according to any one of claims 9-11, wherein the method further comprises: Sending an RRC reconfiguration complete message to the target base station, where the RRC reconfiguration complete message is transmitted based on the timing advance. 13. The method according to claim 12, wherein if the sending of the RRC reconfiguration complete message fails, the method further comprises: Initiating random access to the target base station. 14. The method according to any one of claims 9-13, wherein the method further comprises: The source base station receives from the target base station information about the initial transmit power of uplink transmission between the first terminal and the target base station, where the initial transmit power is determined according to the first information. 15. A communication method, characterized in that the method comprises: Send first information to the target base station, where the first information is used to determine the timing advance of uplink transmission between the first terminal and the target base station, and the first information includes the difference between the first terminal and the target base station. One or more of the measurement result information of the downlink between the two terminals and the location information of the first terminal; receiving information about the timing advance from the target base station; The information of the timing advance is sent to the first terminal. 16. The method according to claim 15, wherein the measurement result information comprises information of the received power of the reference signal. The method according to claim 15 or 16, wherein the first information is carried in a handover request message, and the information of the timing advance is carried in a handover confirmation message and a handover command message. 18. The method according to any one of claims 15-17, wherein the method further comprises: receiving from the target base station information about the initial transmit power of uplink transmission between the first terminal and the target base station, where the initial transmit power is determined according to the first information; Send the information of the initial transmit power to the first terminal. 19. A communication device, comprising a processor coupled to a memory for storing a computer program or instruction, the processor for executing the computer program or instruction such that the claims The method of any one of 1 to 8 or the method of any one of claims 9 to 14 or the method of any one of claims 15 to 18 is performed. 20. A chip, characterized in that it comprises a processor and an interface circuit, wherein the interface circuit is coupled to the processor, and the processor is used for running a computer program or instruction, so that the device according to any one of claims 1 to 8 is executed. The method or the method of any one of claims 9 to 14 or the method of any one of claims 15 to 18 is performed, and the interface circuit is used for communicating with other modules outside the chip.

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