WO2020182031A1

WO2020182031A1 - Communication method and communication apparatus in technical field of wireless communication

Info

Publication number: WO2020182031A1
Application number: PCT/CN2020/077734
Authority: WO
Inventors: 张宏平
Original assignee: 华为技术有限公司
Priority date: 2019-03-12
Filing date: 2020-03-04
Publication date: 2020-09-17
Also published as: CN111698735A

Abstract

Provided in the present application are a communication method and a communication apparatus. The method comprises: receiving first information from a source base station, wherein the first information comprises one or more of measurement result information of a downlink between a first terminal and a target base station, and position information of the first terminal; the first information is used for determining a first timing advance quantity; and the first timing advance quantity is a timing advance quantity of uplink transmission between the first terminal and the target base station; and sending information of the first timing advance quantity to the first terminal by means of the source base station. According to the embodiment of the present application, the timing advance quantity can be determined by means of the target base station, and the timing advance quantity is sent to a terminal device, such that in a base station handover process, the terminal device can skip a random access program, thus reducing signalling overhead and delay of data transmission, and improving the usage experience of a user.

Description

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

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office, the application number is 201910182807.4, and the application title is "a communication method and communication device in the field of wireless communication technology" on March 12, 2019. The reference is incorporated in this application.

Technical field

This application relates to the field of wireless communication technology, and in particular to a communication method and 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 area of one cell to the coverage area of another cell or due to the adjustment of the wireless transmission service 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. This process is handover. The handover process between existing base stations will cause data transmission interruption and delay. For example, the handover process includes the step of random access. The main function of random access is to determine the target cell between the terminal equipment and the target base station. The timing advance (TA) amount and initial transmission power (ITP) of the communication between each other will cause a delay of at least tens of milliseconds in this step.

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

Summary of the invention

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

In the first aspect, a communication method is provided. The method may be executed by a network device, or may also be executed by a chip or circuit configured in the network device. The network device may 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, gNB, CU, or DU, etc., without limitation.

Specifically, the method includes: receiving first information from a 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, and the first timing advance is the timing advance for uplink transmission between the first terminal and the target base station; the source base station sends the first timing advance information to the first terminal.

The communication method provided by the embodiments of the present application can determine the timing advance according to the first information, so that the random access procedure can be skipped during the base station handover, the signaling overhead and the data transmission delay are reduced, and the user experience is 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; and determining the first terminal according to the distance between the first terminal and the target base station. A certain amount of advance.

With reference to the first aspect, in some implementation manners 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 target base station and the target base station according to the measurement result information The 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, the mapping relationship being 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 The timing advance;

According to the mapping relationship and the first information, the first timing advance is determined.

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

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

With reference to the first aspect, in some implementation manners 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: The location information of the terminal determines the distance between the first terminal and the target base station; and determines the path loss between the first terminal and the target base station 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, and the RRC reconfiguration complete message is transmitted based on the initial transmission power.

In the second aspect, a communication method is provided, which may be executed by a terminal device, or may 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 a timing advance of 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 first information, and the first information includes the first terminal One or more of the measurement result information of the downlink with the target base station and the location information of the first terminal.

With reference to the second aspect, in some implementation manners of the second aspect, the measurement result information includes information about the received power of the reference signal.

With reference to the second aspect, in some implementation manners of the second aspect, the timing advance information 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 RRC reconfiguration complete message fails to be sent, 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 the uplink transmission between the first terminal and the target base station, wherein the initial transmit power It is determined based on 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 transmission power.

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

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

With reference to the third aspect, in some implementation manners of the third aspect, the measurement result information includes information about 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 the uplink transmission between the first terminal and the target base station, wherein the initial transmit power is based on the The information is determined; the initial transmission power information is sent to the first terminal.

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

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 for uplink transmission between the first terminal and the target base station.

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

With reference to the fourth aspect, in some implementation manners 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 implementation manners of the fourth aspect, the 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 implementation manners of the fourth aspect, the first indication information is used to instruct the first terminal to determine the initial transmission power for 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, and the RRC reconfiguration complete message is transmitted based on the initial transmission power.

In a fifth aspect, a communication method is provided, which may be executed by a terminal device, or may 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 the timing advance of uplink transmission between the first terminal and the target base station; and determining the timing advance .

With reference to the fifth aspect, in some implementation manners 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 the amount.

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 Path loss between the first terminal and the first terminal; determine the distance between the first terminal and the target base station according to the path loss.

With reference to the fifth aspect, in some implementation manners 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, the second timing advance is the timing of uplink transmission between the second terminal and the target base station Advance amount

According to the mapping relationship and the first information, the timing advance is determined.

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

With reference to the fifth aspect, in some implementation manners 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 transmission power of uplink transmission between the first terminal and the target base station; the method further includes: determining the first terminal The initial transmit power of uplink transmission between a terminal and a target base station.

With reference to the fifth aspect, in some implementation manners 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 downlink measurement result information between the first terminal and the target base station The path loss between the first terminal and the target base station; the initial transmission power is determined according to the path loss.

With reference to the fifth aspect, in some implementation manners of the fifth aspect, when the first information includes 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 implementation manners of the fifth aspect, an RRC reconfiguration complete message is sent to the target base station, and the RRC reconfiguration complete message is transmitted based on the initial transmission power.

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

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 the timing advance of uplink transmission between the first terminal and the target base station; and sending the first terminal to the first terminal. Instructions.

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

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

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

In a seventh aspect, a communication device is provided. The communication device includes a processor coupled with a memory, and the memory is used to store a computer program or instruction. The processor runs the computer program or instruction so that the first aspect to When the method of any one of the sixth aspects is executed, the communication device may further include 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 foregoing first to sixth aspects. The one or more modules may be compatible with The steps of the method in any one of the first aspect to the sixth aspect described above correspond.

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 configured to run a computer program or instruction to implement any of the first to sixth aspects. In one aspect, the interface circuit is used to communicate with modules other than the chip.

In a tenth aspect, a computer storage medium is provided, which stores a program for implementing the method of any one of the first aspect to the sixth aspect. When the program runs in the wireless communication device, the wireless communication device is caused to execute the method of any one of the first aspect to the sixth aspect.

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

The embodiment of the application can determine the first timing advance and the first initial transmission power through the target base station, and send the above-mentioned related 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 related parameters to establish a connection with the target base station and perform uplink data transmission, thereby reducing signaling overhead, reducing time delay, and improving user experience.

Description of the drawings

FIG. 1 is a schematic diagram of a communication system suitable for the method provided by the embodiment of the present application;

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

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

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

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

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

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

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

FIG. 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 this application;

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

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

detailed description

The technical solution in this application will be described below in conjunction with the drawings.

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

The terminal equipment in the embodiments of this application may also be referred to as: terminal, user equipment (UE), mobile station (MS), mobile terminal (MT), access terminal, user 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 users, for example, a handheld device with a wireless connection function, a vehicle-mounted device, and so on. At present, some examples of terminals are: mobile phones (mobile phones), tablets, notebook computers, palmtop computers, mobile internet devices (MID), wearable devices, virtual reality (VR) devices, and augmented reality (augmented reality, AR) equipment, industrial control (industrial control) wireless terminals, unmanned driving (self-driving) wireless terminals, remote medical surgery (remote medical surgery) wireless terminals, smart grid (smart grid) Wireless terminals, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, cellular phones, cordless phones, session initiation protocols , SIP) phone, wireless local loop (WLL) station, personal digital assistant (personal digital assistant, PDA), handheld device with wireless communication function, computing device or other processing device connected to wireless modem, vehicle Devices, wearable devices, terminal devices in a 5G network, or terminal devices in a public land mobile network (PLMN) that will evolve in the future, and the embodiments of the present application are not limited thereto.

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

In addition, in the embodiments of the present application, the terminal device can also be a terminal device in the Internet of Things (IoT) system. IoT is an important part of the development of information technology in the future. Its main technical feature is to pass items through communication technology. Connect with the network to realize the intelligent network of human-machine interconnection and interconnection of things.

In addition, the network device in the embodiment of the present application may be a device used to communicate with a terminal device. The network device may also be called an access network device, a wireless access network device, or a base station, etc., and may be a transmission reception point. point, TRP), it can also be the base transceiver station (BTS) in the global system for mobile communications (GSM) system or code division multiple access (CDMA), or broadband code The base station (NodeB, NB) in the wideband code division multiple access (WCDMA) system can also be the evolved NodeB (eNB or eNodeB) in the LTE system, or the base station controller (base station). controller, BSC), base transceiver station (BTS), home base station (for example, home evolved NodeB, or home NodeB, HNB), baseband unit (BBU), and cloud wireless access The wireless controller in the cloud radio access network (CRAN) scenario, or the network device can be a relay station, an access point, an in-vehicle device, a wearable device, and a network device in a 5G network or a network in a future evolved PLMN network The device, etc., may be an access point (AP) in a WLAN, or a new radio node (gNB) in a new radio system (NR) system, which is not limited in the embodiment of the 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). -CP node), user plane CU node (CU-UP node) and RAN equipment of DU node.

The network equipment provides services to the terminal equipment through the cell or the transceiver point in the cell, and the transmission resources (for example, frequency domain resources, or spectrum resources, or video resources) allocated by the terminal equipment through the network equipment and the cell or 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 a base station corresponding to a small cell. The small cell here can include : Metro cells, micro cells, pico cells, femto cells, etc. These small cells have the characteristics of small coverage and low transmit power, and are suitable for providing high data rates Data transfer services.

FIG. 1 is a schematic diagram of a system 100 applicable to the switching method according to the embodiment of the present application. 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. 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. The base station and the terminal can communicate via wireless links. For example, when the terminal 1 is located within the coverage of the base station 1, the terminal 1 can perform wireless communication with the base station 1, and when the terminal 1 is located within the coverage of the base station 2, the terminal 1 can perform wireless communication with the base station 2. It should be noted that in the embodiments 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, cell 1 in Figure 1 belongs to the cell under base station 1, and cell 2 in Figure 1 belongs to 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 wireless provided by base station 1 and terminal 1 through cell 1. Resources to communicate. The terminal 2, the terminal 3, and the terminal 4 are located within the coverage area of the base station 2 and can communicate with the base station 2 wirelessly.

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

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

The following first explains some terms involved in the embodiments of this application:

1. Timing advance (TA)

TA can be understood as that, in order to avoid interference between uplink transmissions of different terminals in a cell, the base station may require that the 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 can have its own TA. From the perspective of the terminal, the TA can be understood as the time offset between the terminal receiving downlink data and sending uplink data. Since the transmission delays of different terminals are different, the TAs of different terminals may be different. For example, the transmission delay of a terminal farther from the base station is larger, and a terminal closer to the base station needs to send the uplink transmission in advance.

The base station can control the TA of each terminal to control the uplink transmission of different terminals to reach 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 or within the error range of the uplink transmission time domain resource allocated by the base station.

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

For the content of TA, please refer to the relevant content in the third generation partnership project (3rd Generation Partnership Project, 3GPP) (technical specification, TS) 38.211 version (version, V) 15.0.0 section 4.3.

2. Initial transmission power (ITP)

It can be understood that the terminal sends the power of uplink transmission to the base station, for example, the terminal sends the power of uplink transmission to the base station for the first time.

The following describes the method provided by the embodiments of the present application. Hereinafter, 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 It is one or more of terminal 2, terminal 3, and terminal 4 in FIG.

FIG. 2 is a schematic flowchart of the communication method 200 of the present application. Hereinafter, the communication method 200 provided by the embodiment of the present application will be described 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 of uplink transmission between the first terminal and the target base station. For convenience of description below, the timing advance of 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 receiving power (RSRP), signal-to-noise ratio (Signal Noise Ratio, SNR), and received signal strength indicator Any one or more of (received signal strength indication, RSSI) or reference signal received quality (reference signal received quality, RSRQ), etc.

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

The following takes the determination of the timing advance or the initial transmission power based on the first information as an example for introduction. It should be noted that the first information can also be used for other purposes, for example, to determine other parameter information for the first terminal to communicate with the target base station. The embodiment of the present application sets no limitation, and step 220 to step 240 are optional.

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

Optionally, the first information is also used to determine the initial transmission power of the uplink transmission between the first terminal and the target base station. For convenience of description, the initial transmission 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 also include the target base station determining the first initial transmission power according to the first information.

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

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

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

Optionally, step 240 may also include the source base station sending information about the first initial transmission power to the first terminal.

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

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

Optionally, the method 200 may further include the first terminal performing 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 the first terminal performing uplink transmission with the target base station according to the first initial transmission power. For example, the first terminal transmits 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 the first example, the first information includes measurement result information of the downlink between the first terminal and the target base station.

The target base station may determine the 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 the third example, the first information includes the measurement result information of the downlink between the first terminal and the target base station and the location information of the first terminal.

The target base station can respectively 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, please 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 (refer to the second example for details), and then compare the distance between the first terminal and the target base station calculated by the two implementation methods, and select one as the first terminal The distance between the first terminal and the target base station, or, based on the distance between the first terminal and the target base station calculated by these two implementation methods, the distance between the first terminal and the target base station is obtained through an algorithm (for example, averaging) The specific algorithm is not limited in the embodiment of this 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 historically accessed the target base station, and the target base station may obtain the first timing advance according to the historical information.

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 amount between the second terminal and the target base station. The timing advance of the uplink transmission.

Optionally, the target base station may obtain 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 to the target base station the connection between the second terminal and the target base station. One or more of the downlink measurement result information and the location information of the second terminal.

Optionally, the target base station may acquire the timing advance of the second terminal during the random access process of the second terminal, or the target base station may acquire the timing advance after 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 may be understood as multiple pieces of second information and multiple pieces 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 the 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 other base stations to the target base station, where the second information may include 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 transmission 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 transmission 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:

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

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.

The target base station can respectively determine the path loss between the first terminal and the target base station according to the measurement result information of the downlink between the first terminal and the target base station (for details, please 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, please refer to the second example), and then compare the path loss between the first terminal and the target base station calculated by the two implementation methods, and select one as 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 these two implementation methods, the first terminal is obtained through an algorithm (for example, averaging). 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 obtain the 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 transmission power may be information of terminals that have historically accessed the target base station, and the target base station may obtain the first initial transmission power according to the historical information.

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 initial transmission 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 obtain the initial transmission power of the second terminal during the random access process of the second terminal, or the target base station may obtain the initial transmission power of the second terminal after establishing an RRC connection with the second terminal.

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 other base stations to the target base station, where the second information may include 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 transmission power can be understood as the first time the first terminal communicates with the target base station The initial transmit power of the uplink transmission.

In the embodiment of the application, during the handover process, the communication parameters between the first terminal and the target base station can be determined in advance, for example, the timing advance and the initial transmission power. The first terminal can skip the random access process and perform uplink data transmission with the target base station. , Reduce signaling overhead and data transmission delay.

FIG. 3 is a schematic flowchart of the communication method 300 of the present application. The embodiment shown in FIG. 3 can be regarded as a further explanation 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 object, report configuration, and measurement identifier.

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. For example, the signal strength of the current serving cell is lower than a certain threshold and the target cell The signal strength of is higher than a certain threshold.

In step 312, the first terminal sends a measurement report to the source base station, and the measurement report contains the measurement results of the first terminal on a series of cells. Specifically, the measurement of a series of cells may refer to the measurement of a downlink signal (for example, a reference signal) from a cell (specifically, sent by an access device that provides the cell).

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

In step 313, the source base station determines whether it is necessary to switch the serving base station of the first terminal according to the measurement result, and can further determine the target cell of the first terminal, and determine the base station to which the target cell belongs 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, and the base station to which the neighboring cell belongs is determined to be the target base station to be handed over. At this time, the source base station can 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, and the handover request message carries the 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 contains 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 information about the received power of the reference signal to the target base station, and the target base station may determine the first timing advance according to the information about the received power of the reference signal.

It should be understood that the information about the received power of the reference signal may also be information about the received power (beam reference signal receiving power, BRSRP) 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 transmission power.

Optionally, for the transmission of measurement result information, the measurement result information of this application can also be sent separately, or can also be carried in other information and sent to the target base station, which is not limited in this application.

In step 330, the target base station determines the first timing advance according to the 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 path loss PL between the target base station 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, Okumura-Hata model, or Hata model.

Further, after the distance D (unit: meter) between the first terminal and the target base station is determined, T can be calculated according to the following formula: T=2*D/c. Among them, 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 obtaining T, perform conversion according to the definition of timing advance, and it is easy to obtain the timing advance TA.

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 transmission 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 according to the path loss PL and the target base station expected received power (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, and 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 about the first timing advance.

In steps 340 and 350, since the RRC connection has not been established between the first terminal and the target base station, the target base station may send the first timing advance information to the first terminal through the source base station. Specifically, after the target base station confirms that the first terminal is allowed to access and determines the first timing advance, it sends a handover confirmation message to the source base station, and the handover confirmation message may include the first timing advance information. After receiving the first timing advance information, the source base station sends a handover command message to the first terminal, where the handover command message may include the first timing advance information. Step 340 and step 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 first timing advance information 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 in this application. limited.

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

In addition, the information of the first initial transmission power 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. .

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

Specifically, in the 5G system, because high-frequency transmission is used, 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 energy, and the effect is not good. Therefore, a new feature of beamforming has been introduced in the 5G system, that is, the antenna sends signals in a fixed direction. Generally, a synchronization signal block index can be carried in the random access configuration in the handover command message, and the terminal device determines the signal transmission direction according to the synchronization signal block index. However, the technical solution of the present application does not include the random access configuration 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 separately sent to the first terminal, 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 first timing advance information 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 the signal sending direction according to the synchronization signal block index in the handover command message, and send the data signal in this 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 transmission power.

Optionally, if the information of the first initial transmission power is not included in the handover command message, the first terminal may calculate the first initial transmission 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 And get the first initial transmit power ITP.

Optionally, if the uplink data transmission fails (for example, the number of failures of hybrid automatic repeat request (HARQ) reaches the upper limit N), the first terminal can enter the random access procedure, that is, the first terminal at this time Random access can be initiated to the target base station, thereby avoiding increased delay.

The embodiment of the application can determine the first timing advance and the first initial transmission power through the target base station, and send the above-mentioned related information to the first terminal, and the first terminal can skip the random access procedure (random access procedure It takes about tens of milliseconds), and the above-mentioned related parameters are directly used to establish a connection with the target base station and perform uplink data transmission, thereby reducing signaling overhead, reducing time 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 made to fall back 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. The embodiment shown in Fig. 4 can be regarded as a further explanation of the second example of the first implementation in the embodiment shown in Fig. 2. Hereinafter, a communication method 400 provided by an embodiment of the present application will be described with reference to FIG. 4. The method 400 includes:

In step 410, the source base station sends measurement configuration information to the first terminal, 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, and the measurement report contains 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 handed over 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 foregoing steps 410, 411, 412, and 413 can be understood with reference to steps 310, 311, 312, and 313 in the method 300, and the differences are explained here.

In this embodiment, the measurement configuration information sent by the source base station to the first terminal further includes second indication information, which 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 the measurement configuration information carrying the second indication information, it not only starts to perform the measurement, but also determines its current location, and carries the location information in the measurement report, and reports it to the source base station.

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 in accordance with the provisions of the protocol or system.

It is described above 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 separately send the second indication information to the first terminal. This is not limited.

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

Specifically, the source base station may obtain 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 transmission power.

Optionally, for the transmission of the location information, the measurement result information of this application can also be sent separately, or can also be carried in other information and sent to the target base station, which is not limited in this application.

In step 430, the target base station determines the 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 first terminal is allowed to access, the target base station may determine the first timing advance according to the location information.

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

Optionally, the target base station may also determine the first initial transmission 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 location according to the location of the first terminal. According to different scenarios, the target base station can select path loss formulas 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 transmission 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, and 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 about 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 first timing advance information 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, which will not be repeated here.

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

FIG. 5 is a schematic flowchart of the communication method 500 of the present application. The embodiment shown in FIG. 5 can be regarded as a further description of the second implementation in the embodiment shown in FIG. 2. Hereinafter, a communication method 500 provided by an embodiment of the present application will be 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 a 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 handed over 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, and 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 will not be repeated here.

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

Specifically, the target base station may first obtain the mapping relationship, which is the mapping relationship between the second information and the second timing advance, and the second information includes the 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 uplink transmission between the second terminal and the target base station; the first timing is determined according to the mapping relationship and the first information 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 may 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 the 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 second timing advance information. Wherein, the second terminal reporting the corresponding relationship may also include the second terminal reporting the corresponding relationship through another base station.

Optionally, the target base station may send indication information to the connected second terminal (for example, the indication information may be broadcast to each second terminal), and the indication information is used to instruct multiple second terminals to report the multiple second terminals. The corresponding relationship between information and multiple second timing advances. After receiving the instruction 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 corresponding relationship between the second information stored locally and the second timing advance.

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

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

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

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

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

Table 1:

RSRP值RSRP value	RSRP#1RSRP#1	RSRP#2RSRP#2	RSRP#3RSRP#3	……	RSRP#nRSRP#n
位置坐标Position coordinates	coordinate#1coordinate#1	coordinate#2coordinate#2	coordinate#3coordinate#3	……	coordinate#ncoordinate#n
TA值TA value	TA#1TA#1	TA#2TA#2	TA#3TA#3	……	TA#nTA#n

Table 1 shows the corresponding relationship between the received power of n reference signals and n TA values, and also shows the corresponding relationship between n position coordinates and 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 TA#1 corresponding to the first information may be determined as the first timing advance.

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

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

For another example, the parameter indicated by the first message 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 this application does not limit the algorithm for obtaining TA#1-2. As an example, TA#1-2 can be obtained by averaging TA#1 and TA#2.

It should be understood that the foregoing Table 1 is only used as an example, and the present application does not limit the existence form or possible content of the mapping relationship #A. 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, the The content 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 transmission 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 transmit power, the second initial transmit power is the initial transmit 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 transmission power.

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

It should be understood that in actual communication applications, the upstream and downstream path loss PL are not the same (the method 300 actually assumes that the upstream and downstream path loss PL are the same). Similarly, the aforementioned method 300 and method 400 are based on 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 accuracy of the first timing advance calculated by method 300 and method 400 may not be high enough . In the method 500 provided in this embodiment, the first timing advance is determined according to past experience values, which can improve the accuracy of the result.

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

Optionally, multiple timing advances may be determined by multiple of the foregoing three methods, and the first timing advance may be determined according to the multiple timing advances, for example, by averaging the multiple timing advances. The first timing advance.

Optionally, the first timing advance calculated in the method 300 and the method 400 may be corrected 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 the method 300 and the method 400, the mapping relationship may also be perfected (or corrected) by the calculated first timing advance, for example, The corresponding relationship between the first information and the first timing advance is added to the mapping relationship.

The foregoing Figure 5 describes the process in which the target base station obtains the first timing advance and/or the first initial transmission power according to the mapping relationship. It should be noted that the target base station may broadcast the mapping relationship (for example, through a system message), and the first terminal may After receiving the mapping relationship, the first terminal obtains the first timing advance and/or the first initial transmission power according to the mapping relationship.

FIG. 6 is a schematic flowchart of the communication method 600 of the present application. Hereinafter, a communication method 600 provided by an embodiment of the present application will be described 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 transmission 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, in accordance with the provisions of the protocol or system, it is a series of specific codes, or a bit of 0 or 1, or is distinguished by NULL and non-NULL. Alternatively, the first indication information may implicitly indicate, for example, the target base station sends the location information of the target base station to the first terminal through the source base station, implicitly instructing the first terminal to determine the first timing advance and/or the first initial transmission power .

The first indication information is used to instruct the first terminal to determine the first timing advance or the first initial transmission power as an example for introduction. It should be noted that the first indication information may also be used for other purposes, for example, to indicate A terminal determines other parameter information for communication between the first terminal and the target base station, which is not limited in the 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 first indication information to the first terminal.

Optionally, step 620 and step 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 transmission 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 measurement result information of the downlink 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 the third example, the first terminal may respectively 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, please refer to the first example), And determine the distance between the first terminal and the target base station according to the location information of the first terminal (for details, please refer to the second example), and then calculate the distance between the first terminal and the target base station calculated by these two implementation methods Compare, choose one as the distance between the first terminal and the target base station, or, based on the distance between the first terminal and the target base station calculated by the two implementation methods, pass an algorithm (for example, take an average) 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 obtain 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 the location information of the first terminal determines 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 a system message to obtain the mapping relationship.

For the related content of the mapping relationship, refer to the related description of the foregoing step 220, which will not be repeated in this embodiment.

The following describes how the first terminal determines the first initial transmission 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 transmission 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 the third example, the first terminal may determine the path loss between the first terminal and the target base station according to the measurement result information of the downlink between the first terminal and the target base station (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, please refer to the second example), and then calculate the path loss between the first terminal and the target base station obtained by these two implementations. The path loss is compared, and one is selected as the path loss between the first terminal and the target base station, or, based on the path loss between the first terminal and the target base station calculated by the two implementation methods, an algorithm is adopted The path loss between the first terminal and the target base station is obtained (for example, averaging). The embodiment of the present application does not limit the specific algorithm.

As a second implementation manner, the first terminal may obtain 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 the location information of the first terminal to determine the first initial transmission 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.

In this embodiment, during the handover process, the first terminal can determine in advance the parameters for the first terminal to communicate with the target base station, for example, the timing advance and the initial transmission power. The first terminal can skip the random access process and 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 can 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 a measurement report to the source base station.

In step 713, the source base station determines whether it is necessary to switch the serving base station of the first terminal 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 foregoing steps 710, 711, 712, and 713 can be understood with reference to steps 310, 311, 312, and 313 in the method 300, and will not be 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, when the target base station receives the handover request message, it first determines whether or not to allow the terminal device to access according to its own connection number, etc., if allowed, the target base station may generate first indication information, which is used to indicate The first terminal determines the first timing advance.

Optionally, the first indication information may also instruct the first terminal to determine the first initial transmission power.

In step 740, the target base station sends a handover confirmation message to the source base station, and 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 first terminal device is allowed to access 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 separately sent to the source base station and/or the first terminal, or may 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 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 can be carried in the handover confirmation message and the handover command message, or can also be carried in the first indication information. In addition, the location information of the target base station may also be separately sent to the source base station and/or the first terminal, or may 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.

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 the measurement result information of the downlink between the first terminal and the target base station.

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

For details, reference may be made to the related content of the foregoing method 200, and the methods 300, 600, such as 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 transmission 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 related content of the foregoing method 200, and the methods 400 and 600, such as the related description of steps 220, 430, and 640.

Optionally, when the first terminal needs to determine the first timing advance according to its own location, the first terminal also needs to obtain the location of the target base station. In this case, the target base station may send its location information to the first terminal through the source base station in advance. One 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 related content of the foregoing method 200, and the methods 500 and 600, such as the related description 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.

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

Among them, 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, at this time, the first terminal can initiate a random access procedure to the target base station, thereby enabling Avoid adding time delay.

In addition, in step 751, if the first timing advance cannot be determined due to the lack of relevant parameters (for example, the location of the target base station) of the first terminal, etc., 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 specified by the system or protocol, and the first terminal may determine the relevant parameters according to the first information. This is not limited.

6 to 7 described above, 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 predefined by the communication system to calculate the first timing advance, and the target base station does not need to send instructions. , 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 related content in FIGS. 6-7.

Above, the communication method provided by the embodiment of the present application has been described in detail with reference to FIGS. 2 to 7. Hereinafter, the communication device provided by the embodiment of the present application will be described in detail with reference to FIGS. 8 to 10.

Figure 8 is a schematic diagram of the structure of a network device. The source base station or target base station can 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, by a bus. The antenna 1515 is connected to the transceiver 1513. The network interface 1514 is used to connect the network device to other communication devices through a communication link. In the embodiment of the present application, the connection may include various interfaces, transmission lines, or buses, etc., which is not limited in this embodiment.

The memory 1512 may exist independently and is connected to the processor 1511. Optionally, the memory 1512 may also be integrated with the processor 1511, for example, integrated in one chip. Wherein, the memory 1512 can store program codes for executing the technical solutions of the embodiments of the present application, and the processor 1511 controls the execution. Various types of computer program codes executed can also be regarded as the driver programs of the processor 1511. For example, the processor 1511 is configured to execute computer program codes stored in the memory 1512, so as to implement 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, and 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 a 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 it through a Or multiple antennas 1515 transmit the radio frequency signal. 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, the up-mixing processing and digital-to-analog conversion processing The order of precedence 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 provided by an embodiment of the application. For the structure of the first terminal, refer 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 further 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 implement 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 in software programs; or to assist in completion Computing processing tasks, such as graphics and 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 communicates 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 (Liquid Crystal Display, LCD), a light emitting diode (Light Emitting Diode, LED) display device, a cathode ray tube (Cathode Ray Tube, CRT) display device, or a projector (projector) Wait. The input device 1615 communicates with the 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, or a sensor device.

FIG. 10 is a schematic structural diagram of a communication device 1200 provided by an embodiment of this 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 for communicating with other network equipment or terminals.

The storage unit 1203 may include one or more memories.

The storage unit 1203 may 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 communication equipment, circuits, hardware components, or chips.

The communication apparatus 1200 may be the source base station or the target base station in the embodiment of the present application. The 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, for example, the antenna 1515 and the transceiver 1513 in FIG. 8. The communication unit 1202 may also include a network interface of a network device, such as the network interface 1514 in FIG. 8.

The communication device 1200 may be a chip in a source base station or a chip in a target base station in the embodiment of the present application. The communication unit 1202 may be an input or output interface, pin or circuit, or the like. Optionally, the storage unit 1203 may store a computer-executed instruction 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 embodiment. The storage unit 1203 can be a register, a cache or RAM, etc. 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. The storage unit 1203 can be integrated 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 the embodiment of the present application. Optionally, the communication unit 1202 of the communication device 1200 may include an antenna and a transceiver of the terminal, for example, the antenna 1616 and the transceiver 1612 in FIG. 9. Optionally, the communication unit 1202 may also include an output device and an input device, such as the output device 1614 and the input device 1615 in FIG. 9.

The communication device 1200 may be a chip in the first terminal in the embodiment of the present application. The communication unit 1202 may be an input or output interface, pin or circuit, or the like. Optionally, the storage unit 1203 may store a computer execution instruction of the method on the terminal side, so that the processing unit 1201 executes the method on the first terminal in the foregoing embodiment. The storage unit 1203 can be a register, a cache or RAM, etc. 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. The storage unit 1203 can be integrated 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 the target base station or the chip in the target base station, the processing unit 1201 can complete the actions processed by the target base station in the above method, the storage unit 1203 can complete the actions stored in the above method, and the communication unit 1202 can complete the above methods and The interactive actions of the source base station or the first terminal are described as follows:

The communication unit 1202 may receive first information from the source base station. The first information includes one or more of the downlink measurement result information between the first terminal and the target base station and the location information of the first terminal. The first information Used to determine the first timing advance, the first timing advance is the timing advance for uplink transmission between the first terminal and the target base station; the communication unit 1202 may send the first timing advance information 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 obtain the mapping relationship, and the content of the mapping relationship may refer to the content in other embodiments. 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, and the RRC reconfiguration complete message is transmitted based on the first timing advance.

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

When the communication device 1200 is the first terminal or the chip in the first terminal, the processing unit 1201 can complete the actions processed by the first terminal in the above method, the storage unit 1203 can complete the actions stored by 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 foregoing method can be completed, and an exemplary description is given below:

The communication unit 1202 may receive from the target base station the timing advance of the uplink transmission between the first terminal and the target base station through the source base station, where 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 inter-downlink 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, and the RRC reconfiguration complete message is transmitted based on the timing advance.

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

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

When the communication device 1200 is the source base station or the chip in the source base station, the processing unit 1201 can complete the actions processed by the source base station in the above method, the storage unit 1203 can complete the actions stored in the above method, and the communication unit 1202 can complete the steps in the above method and The interactive actions of the target base station or the first terminal are exemplified as follows:

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 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 the 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 information to the first terminal Send the initial transmit power information.

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

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

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

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 path loss between the first terminal and the network device 1700 according to the path loss The distance between.

Optionally, the determining unit 1730 may be configured to obtain the mapping relationship, and the content of the mapping relationship may refer to the content 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 transmission power of the uplink transmission between the first terminal and the network device 1700, and the sending unit 1720 is further configured to send the initial transmission power information to the first terminal through the source base station.

The units in the network device 1700 in the embodiment of the present application and the other operations or functions described above are respectively intended to implement the corresponding processes executed by the target base station in the above embodiments. For brevity, I won't repeat them here.

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

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

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

Optionally, the measurement result information includes information about 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, and the RRC reconfiguration complete message is transmitted based on the timing advance.

Optionally, if the RRC reconfiguration complete message fails to be sent, 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 the initial transmission power information of the uplink transmission between the terminal device 1800 and the target base station from the target base station through the source base station, where the initial transmission 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 used to implement the corresponding processes executed by the first terminal in the above embodiments. For brevity, I won't repeat them here.

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

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

The receiving unit 1920 is configured to receive timing advance information from the target base station;

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

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

The sending unit 1910 is further configured to send information of initial transmission 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 intended to realize the corresponding processes executed by the source base station in the above-mentioned embodiments. For brevity, I won't repeat them here.

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

In the implementation process, the steps of the above method can be completed by hardware integrated logic circuits in the processor or instructions in the form of software. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware processor, or executed and completed by a combination of hardware and software modules in the processor. The software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers. 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, it will not be described in detail here.

It should be noted that the processor in the embodiment of the present application may be an integrated circuit chip with signal processing capability. In the implementation process, the steps of the foregoing method embodiments can be completed by hardware integrated logic circuits in the processor or instructions in the form of software. The above-mentioned processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components . The methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor. The software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers. 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. Among them, the non-volatile memory can be read-only memory (ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), and electrically available Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory. The volatile memory may be random access memory (RAM), which is used as an external cache. By way of exemplary but not restrictive description, many forms of RAM are available, such as static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory (synchlink DRAM, SLDRAM) ) And direct memory bus random access memory (direct rambus RAM, DR RAM). It should be noted that the memories of the systems and methods described herein are intended to include, but are not limited to, these and any other suitable types of memories.

According to the method provided in the embodiments 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 caused to execute as shown in Figure 2-6 The method of any one of the embodiments.

According to the method provided in the embodiments of the present application, the present application also provides a computer-readable medium that stores program code, and when the program code runs on a computer, the computer executes the steps shown in Figure 2-6. The method of any one of the embodiments.

According to the method provided in the embodiments of the present application, the present application also provides a system, which includes the aforementioned one or more terminal devices and one or more network devices.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a dedicated computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center. Transmission to another website, computer, server or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as 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 or a data center integrated with one or more available media. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a high-density digital video disc (digital video disc, DVD)), or a semiconductor medium (for example, a solid state disk (solid state disc, SSD)) etc.

The network equipment in the above-mentioned device embodiments completely corresponds to the network equipment or terminal equipment in the terminal equipment and method embodiments, and the corresponding modules or units execute the corresponding steps. For example, the communication unit (transceiver) performs the receiving or In the sending step, other steps except sending and receiving can be executed by the processing unit (processor). For the functions of specific units, refer to the corresponding method embodiments. There may be one or more processors.

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

Those of ordinary skill in the art may realize that the various illustrative logical blocks and steps described in the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. achieve. Whether these functions are executed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and conciseness of description, the specific working process of the above-described system, device, and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method may be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, 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 the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

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

If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solution of this application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disk or optical disk and other media that can store program code .

It should be noted that in the embodiments of the present application, words such as "exemplary" or "for example" are used as examples, illustrations, or illustrations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferable or advantageous than other embodiments or design solutions. To be precise, words such as "exemplary" or "for example" are used to present related concepts in a specific manner.

In this application, "at least one" refers to one or more. "Multiple" means two or more. "And/or" describes the association relationship of the associated objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A alone exists, both A and B exist, and B exists alone, where A, B can be singular or plural. The character "/" generally indicates that the associated objects are in an "or" relationship. "The following at least one item (a)" or similar expressions refers to any combination of these items, including any combination of a single item (a) or plural items (a). For example, at least one item (a) of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can 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 items or similar items that have substantially the same function and effect. Those skilled in the art can understand that words such as "first" and "second" do not limit the quantity and order of execution, and words such as "first" and "second" do not limit the difference.

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 implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Should be covered within the scope of protection of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

A communication method, characterized in that the method includes:

First information is received from the source base station, where the first information includes one or more of the downlink measurement result information between the first terminal and the target base station and the location information of the first terminal. A piece of information 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;

Sending the information of the first timing advance to the first terminal through the source base station.
The method of claim 1, wherein the method further comprises:

Determine the distance between the first terminal and the target base station according to the first information;

Determining the first timing advance according to the distance between the first terminal and the target base station.
The method according to claim 2, wherein when the first information includes the measurement result information, the determining the distance between the first terminal and the target base station according to the first information include:

Determine the path loss between the target base station and the first terminal according to the measurement result information;

Determine the distance between the first terminal and the target base station according to the path loss.
The method of claim 1, wherein the method further comprises:

Acquire 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 between the second terminal and the target base station and all One or more of the location information of the second terminal, and the second timing advance is the timing advance of uplink transmission between the second terminal and the target base station;

Determine the first timing advance according to the mapping relationship and the first information.
The method according to any one of claims 1-4, wherein the measurement result information includes information about the received power of the reference signal.
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 message .
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, where the RRC reconfiguration complete message is transmitted based on the first timing advance.
The method according to any one of claims 1-7, wherein the first information is also used to determine the initial transmission power of uplink transmission between the first terminal and the target base station; the method Also includes:

Sending the initial transmission power information to the first terminal through the source base station.
A communication method, characterized in that the method includes:

Receiving, from the target base station through 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.
The method according to claim 9, wherein the measurement result information includes information about the received power of the reference signal.
The method according to claim 9 or 10, wherein the timing advance information is carried in a handover confirmation message and a handover command message.
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.
The method according to claim 12, wherein if the RRC reconfiguration complete message fails to be sent, the method further comprises:

Initiate random access to the target base station.
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 the uplink transmission between the first terminal and the target base station, where the initial transmit power is determined according to the first information.
A communication method, characterized in that the method includes:

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 relationship between the first terminal and the target base station. One or more of the measurement result information of the inter-downlink and the location information of the first terminal;

Receiving the timing advance information from the target base station;

Sending the timing advance information to the first terminal.
The method according to claim 15, wherein the measurement result information includes information about 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 timing advance information is carried in a handover confirmation message and a handover command message.
The method according to any one of claims 15-17, wherein the method further comprises:

Receiving, from the target base station, information about initial transmission power for uplink transmission between the first terminal and the target base station, where the initial transmission power is determined according to the first information;

Sending the initial transmit power information to the first terminal.
A communication device, characterized by comprising a processor, the processor is coupled with a memory, the memory is used to store a computer program or instruction, and the processor is used to execute the computer program or instruction, so that claims 1 to 8. Any of the methods or the methods of any of claims 9 to 14 or the methods of any of claims 15 to 18 are executed.
A chip, characterized by comprising a processor and an interface circuit, the interface circuit is coupled with the processor, and the processor is used to run a computer program or instruction, so that the method according to any one of claims 1 to 8 or The method according to any one of claims 9 to 14 or the method according to any one of claims 15 to 18 is executed, and the interface circuit is used to communicate with modules other than the chip.