WO2023092460A1

WO2023092460A1 - Mobility robustness optimization method, and terminal device, network device and storage medium

Info

Publication number: WO2023092460A1
Application number: PCT/CN2021/133562
Authority: WO
Inventors: 刘洋; 范江胜; 李海涛; 胡奕
Original assignee: Oppo广东移动通信有限公司
Priority date: 2021-11-26
Filing date: 2021-11-26
Publication date: 2023-06-01
Also published as: CN117941414A

Abstract

Provided in the embodiments of the present application are a mobility robustness optimization method, and a terminal device, a network device and a storage medium, which are used for mobility robustness optimization. The mobility robustness optimization method provided in the present application can comprise: a terminal device sending a radio link failure report, wherein the radio link failure report comprises distance-related information, and the radio link failure report is used for mobility robustness optimization.

Description

Method for robustness optimization of mobility, terminal equipment, network equipment and storage medium

technical field

The present application relates to the communication field, and in particular to a method for optimizing mobility robustness, terminal equipment, network equipment and storage media.

Background technique

Currently, the network does not know whether or not to optimize the location-based measurement reporting conditions configured for the network, nor does it know how to optimize.

Contents of the invention

Embodiments of the present application provide a mobility robustness optimization method, a terminal device, a network device, and a storage medium, for the mobility robustness optimization.

The first aspect of the embodiments of the present application provides a method for mobility robustness optimization, which may include:

The terminal device sends a radio link failure report, where the radio link failure report includes distance-related information, and the radio link failure report is used for mobility robustness optimization.

The second aspect of the embodiments of the present application provides a method for mobility robustness optimization, which may include:

The network device receives a wireless link failure report, where the wireless link failure report includes distance-related information;

The network device adjusts a distance-based measurement reporting condition according to the distance-related information.

The third aspect of the embodiment of the present application provides a terminal device, which may include:

A transceiver module, configured to send a radio link failure report, where the radio link failure report includes distance-related information, and the radio link failure report is used for mobility robustness optimization.

A fourth aspect of the embodiment of the present application provides a network device, which may include:

A transceiver module, configured to receive a wireless link failure report, where the wireless link failure report includes distance-related information;

A processing module, configured to adjust distance-based measurement reporting conditions according to the distance-related information.

A fifth aspect of the embodiment of the present application provides a terminal device, which may include:

a memory storing executable program code;

a transceiver and a processor coupled to the memory;

The transceiver is configured to send a radio link failure report, the radio link failure report includes distance-related information, and the radio link failure report is used for mobility robustness optimization.

A sixth aspect of the embodiment of the present application provides a network device, which may include:

a memory storing executable program code;

a transceiver and a processor coupled to the memory;

The transceiver is configured to receive a wireless link failure report, where the wireless link failure report includes distance-related information;

The processor is configured to adjust distance-based measurement reporting conditions according to the distance-related information.

Still another aspect of the embodiments of the present application provides a computer-readable storage medium, including instructions, which, when run on a computer, cause the computer to execute the method described in the first aspect or the second aspect of the present invention.

Another aspect of the embodiments of the present application provides a chip, the chip is coupled to the memory in the terminal device, so that the chip calls the program instructions stored in the memory during operation, so that the terminal device executes the The method described in the first aspect or the second aspect of the invention.

In the technical solution provided by the embodiment of the present application, the terminal device sends a radio link failure report, the radio link failure report includes distance-related information, and the radio link failure report is used for mobility robustness optimization. In order to help the network equipment to adjust the distance-based measurement reporting conditions to achieve mobility robustness optimization.

Description of drawings

FIG. 1A is a schematic diagram of the handover process;

FIG. 1B is a schematic diagram of a scene of premature handover in the system and a solution idea in an implementation manner;

FIG. 1C is a schematic diagram of a too late switching scene and a solution in an implementation;

FIG. 1D is a schematic diagram of a possible scenario of switching to a wrong cell and a solution;

FIG. 2 is a system architecture diagram of a communication system applied in an embodiment of the present invention;

FIG. 3 is a schematic diagram of an embodiment of a method for mobility robustness optimization in an embodiment of the present application;

FIG. 4 is a schematic diagram of an embodiment of a terminal device in an embodiment of the present application;

FIG. 5 is a schematic diagram of an embodiment of a network device in the embodiment of the present application;

FIG. 6 is a schematic diagram of another embodiment of a terminal device in the embodiment of the present application;

FIG. 7 is a schematic diagram of another embodiment of a network device in the embodiment of the present application.

Detailed ways

The following will describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of this application.

The following is a brief description of some of the terms involved in this application, as follows:

Part 1: NTN 5G Network

1. Background of NTN (Non Terrestrial Network)

At present, the third generation partnership project (3rd Generation Partnership Project, 3GPP) is researching the non-terrestrial communication network (NTN, Non Terrestrial Network) technology. NTN generally uses satellite communication to provide communication services to ground users. Compared with terrestrial cellular network communication, satellite communication has many unique advantages. First of all, satellite communication is not restricted by the user's region. For example, general land communication cannot cover areas such as oceans, mountains, deserts, etc. that cannot be equipped with communication equipment or are not covered by communication due to sparse population. For satellite communication, due to a Satellites can cover a large area of the ground, and satellites can orbit the earth, so theoretically every corner of the earth can be covered by satellite communications. Secondly, satellite communication has great social value. Satellite communication can be covered at a lower cost in remote mountainous areas, poor and backward countries or regions, so that people in these regions can enjoy advanced voice communication and mobile Internet technology, which is conducive to narrowing the digital gap with developed regions and promoting development of these areas. Thirdly, the distance of satellite communication is long, and the cost of communication does not increase significantly with the increase of communication distance; finally, the stability of satellite communication is high, and it is not limited by natural disasters.

Communication satellites are divided into LEO (Low-Earth Orbit, Low Earth Orbit) satellites, MEO (Medium-Earth Orbit, Medium Earth Orbit) satellites, GEO (Geostationary Earth Orbit, Geosynchronous Orbit) satellites, HEO (High Elliptical Orbit, high elliptical orbit) satellites and so on. At present, the main researches are LEO and GEO.

For LEO satellites, the orbital altitude ranges from 500km to 1500km, and the corresponding orbital period is about 1.5 hours to 2 hours. The signal propagation delay of single-hop communication between terminals is generally less than 20ms. The maximum satellite visible time is 20 minutes. The signal propagation distance is short, the link loss is small, and the requirements for the transmission power of the terminal are not high.

For GEO satellites, the orbital altitude is 35786km, and the rotation period around the earth is 24 hours. The signal propagation delay of single-hop communication between users is generally 250ms.

In order to ensure satellite coverage and improve the system capacity of the entire satellite communication system, satellites use multiple beams to cover the ground. A satellite can form dozens or even hundreds of beams to cover the ground; a satellite beam can cover tens to hundreds of kilometers in diameter. the ground area.

2. New Radio (NR) switching process

The NR system supports the handover process of the connected user equipment (User Equipment, UE). When a terminal using network services moves from one cell to another, or due to reasons such as wireless transmission business load adjustment, activation operation maintenance, equipment failure, etc., in order to ensure the continuity of communication and the quality of service, the system must The communication link with the original cell is transferred to the new cell, that is, the handover process is performed.

Taking the switching process of the Xn interface as an example, as shown in FIG. 1A , it is a schematic diagram of the switching process. The entire switching process is divided into the following three stages, as follows:

(1) Handover preparation: including measurement control and reporting, handover request and confirmation. The handover confirmation message includes the handover command generated by the target cell, and the source base station does not allow any modification to the handover command generated by the target base station, and directly forwards the handover command to the terminal.

(2) Handover execution: The terminal executes the handover process immediately after receiving the handover command, that is, the terminal disconnects the source base station and connects with the target base station (such as performing random access, sending a radio resource control (Radio Resource Control, RRC) handover completion message to target base station, etc.); serial number (SerialNumber, SN) state transfer, data forwarding, etc.

(3) Handover is completed: the target base station performs Path Switch with the Access and Mobility Management function (AMF) and the user plane function (UPF), and releases the UE context of the source base station.

3. NR measurement

The measurement mainly refers to the mobility measurement in the connected state. After the network sends the measurement configuration to the UE, the UE detects the signal quality status of the neighboring cell according to the measurement object indicated in the measurement configuration, the reporting configuration and other parameters, and feeds back the measurement reporting information to the network for the network to perform handover or improve the relationship between neighboring cells list.

3.1. Measurement configuration

In NR, the network sends measurement configuration information to the connected UE through RRC signaling, and the UE performs measurement (same frequency, different frequency, different technology) according to the content of the measurement configuration information, and then reports the measurement result to the network. The network uses RRC connection reconfiguration for measurement configuration, and the measurement configuration information includes the following:

(1) Measurement Object

For intra-frequency measurement and inter-frequency measurement, each measurement object indicates the time-frequency position to be measured and the subcarrier spacing of the reference signal. For the cells related to the measurement object, the network may configure a cell offset (Offset) list, a black list of cells and a white list of cells.

For different technology measurements, each measurement object corresponds to a separate Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access (Evolved UMTS Terrestrial Radio Access Network, E-UTRA) frequency point, and the E-UTRA For cells related to the UTRA frequency point, the network may configure a cell offset (Offset) list, a blacklist cell list, and a whitelist cell list.

The UE does not perform any operation on the blacklisted cells in the event evaluation and measurement report. The UE performs event evaluation and measurement report on the whitelisted cells.

(2) Reporting Configuration

Each measurement object corresponds to one or more reporting configurations. The reporting configuration includes:

- Reporting criteria: the triggering condition for the UE to perform measurement reporting, which can be periodic triggering reporting or event triggering reporting.

-Reference Signal (RS) type: RS used by UE for beam and cell measurement, which can be SS (Synchronous signal Block)/PBCH (physical broadcasting channel) or periodic channel state information reference signal (CSI reference signals , CSI-RS).

-Reporting format: The amount of measurement reported by the UE for each cell and each beam (such as Reference Signal Receiving Power (RSRP)), also contains other relevant information, such as the maximum number of cells reported by the UE and the number of cells for each beam. The maximum number of beams reported by a cell.

The measurement events currently supported in NR include the following:

A1 event: the signal quality of the serving cell is higher than a threshold

A2 event: The signal quality of the serving cell is lower than a threshold

A3 event: The signal quality of the neighboring cell is higher than the signal quality of the special cell (SpCell) by a threshold

A4 event: the signal quality of the neighboring cell is higher than a threshold

A5 event: The signal quality of the SpCell is lower than a threshold 1, and the signal quality of the neighboring cell is higher than a threshold 2

A6 event: The signal quality of the neighboring cell is higher than the signal quality of the secondary cell (Secondary Cell, SCell) by a threshold

Event B1: The signal quality of neighboring cells of different technologies is higher than a threshold

B2 event: The signal quality of the primary cell (Primary Cell, PCell) is lower than a threshold 1, and the signal quality of a neighboring cell of a different technology is higher than a threshold 2

It should be noted that the special cell SpCell=primary cell PCell+primary secondary cell PSCell.

(3) Measurement Identity

A separate identity (Identity, ID) associates the measurement object with the reporting configuration. A measurement object can be associated with multiple reporting configurations at the same time, and a reporting configuration can also be associated with multiple measurement objects at the same time, which are distinguished by measurement identifiers.

(4) Measurement Gap

The period in which the UE performs measurements.

3.2. Measurement report

The UE performs measurement according to the measurement configuration issued by the network, and evaluates the measurement report when certain trigger conditions are met. If the reporting conditions are met, the UE will fill in the measurement report and include it in the measurement report and send it to the network.

Among them, measurement reporting is divided into three categories:

(1) Event trigger

Only when the UE meets the measurement event entry threshold configured by the network and lasts for a period of time, will it trigger the sending of the measurement report, and the process ends after the measurement report is sent once. The reporting configuration corresponding to this criterion is:

The trigger type is "event" including a measurement event and its threshold parameters in A1-A6, B1-B2;

The number of reports is 1;

Regardless of the configured value of the reporting interval, the UE ignores it.

(2) Periodic reporting

After the network configures the measurement, the UE performs the measurement of the corresponding frequency point according to the configuration content, and sends the measurement report according to the specified reporting period and interval.

The trigger cycle is "period", including "report Cell Global Identifier (reportCGI)" and "report Strongest Cell";

If the reporting purpose is "reportCGI", the number of reporting times is equal to 1, and if the reporting purpose is "reportStrongestCell", the number of reporting times can be greater than 1.

Once the UE is configured to report the "reportCGI" purpose, it will start the T321 timer. In order for the network to obtain the information required for establishing the neighbor cell list as soon as possible, if the content required for the report has been obtained before the timer expires, the UE can stop T321 and initiate the report in advance.

(3) Event trigger cycle reporting

The UE will only trigger the sending of the measurement report when the measurement event entry threshold configured by the network is met and lasts for a period of time (Time to trigger timer). After the report is triggered, the timer between multiple measurements and the number of measurements will be started counter until the number of reports reaches the requirement and the process ends. The reporting configuration corresponding to this criterion is:

The trigger type is "Event", which includes a measurement event and its threshold parameters in A1~A5;

The number of reports is greater than 1;

The reporting interval is valid, and the network sets the reporting cycle timer according to the configured interval parameters.

3.3. NTN location-based measurement report condition setting:

Because the difference between the Reference Signal Receiving Power (RSRP)/Reference Signal Receiving Quality (Reference Signal Receiving Quality, RSRQ) at the cell center and the edge of the NTN cell is very small, and the RSRP/RSRQ measurement itself has errors, the network can be The terminal configures the measurement report condition based on the distance difference between the satellite where the source base station is located and the satellite where the target base station is located. When the terminal knows that the distance between two satellites is less than or equal to the threshold given by the network, or the distance between the terminal and the reference point of the cell corresponding to the source satellite is greater than threshold1, and the distance between the terminal and the reference point of the cell corresponding to the target satellite is less than threshold2 , the terminal reports the signal measurement about the target base station to the source base station, and then the source base station sends a handover command to the terminal to start a handover process.

Part II: Mobility Robustness Enhancement

MRO is the abbreviation of Mobility Robustness Optimization (Mobile Robustness Optimization). MRO aims to discover and improve the bad experience encountered by the terminal during handover, including too early handover (too early handover), too late handover (too late handover) and handover to wrong cell (handover to wrong cell). This is achieved by the terminal reporting a wireless link failure report containing handover-related information, and the network makes adjustments after analysis. In addition, in R17, 3GPP also decided to use the successful handover report reported by the terminal to help optimize the network under some conditions (eg, the terminal has not completed the handover after T310 timeout). These scenarios are described below.

1. Switching too early

Premature handover refers to the occurrence of radio link failure (Radio Link Failure report, RLF)/handover failure (handover failure, HOF) in the target cell after/during the successful handover from the source cell to the target cell. ), or the terminal switch fails. In the subsequent reselection process, the terminal selects the source cell to initiate reestablishment and camps on again. In R16 5G NR, the scenarios to be considered are divided into two categories: intra-system and inter-system. Among them, the system means that both the source base station and the target base station are connected to the 5G core network; as shown in Figure 1B, it is a schematic diagram of a scene of premature handover in the system and a solution in an implementation mode.

As shown in FIG. 1B , after the terminal reselects to the source base station and enters the connected state, the terminal sends a radio link failure report to the source base station through the air interface. The source base station will route it to the target base station through failure indication information (failure indication information) signaling. By determining whether the timeConnFailure-r16 carried by the terminal in the radio link failure report (RLF report) (representing the time from receiving the handover command to the final connection failure) is smaller than the pre-configured threshold Tstore_UE_cntxt to determine whether the terminal failure type belongs to the over Switch early. If so, in the third step, the target base station sends a handover report (handover report) carrying "premature handover" indication information to the source base station, so that the source base station can adjust the relevant threshold setting.

2. Switch too late

Too late handover means that the terminal does not receive the handover command from the source cell in time and execute the handover, resulting in radio link failure in the source cell. A possible reason may be that the threshold of the measurement result of the neighbor cell that triggers the reporting of the measurement report is relatively high, and/or the threshold of the measurement result of the currently camped cell is relatively low. In order to solve this problem, after successfully accessing a neighboring cell after a connection failure occurs, the terminal will send a radio link failure report to the current serving base station through the air interface if requested, and then the current serving base station will pass it to fail. The indication information signaling is routed to potential multiple base stations including the base station where the terminal is located when the wireless link failure occurs (the physical sector identifier (Physical Cell Identifier, PCI) of a serving cell of these base stations and the PCI carried in the terminal reconstruction request match). When the receiving base station verifies the integrity of the Cell-Radio Network Temporary Identifier (C-RNTI), the failed secondary cell ID (failedPCellID) and the short Media Access Control (MAC) carried in the signaling If the verification value (short Medium Access Control integrity protection, shortMAC-I) matches its own information, it can be confirmed that the destination base station of this signaling is itself, and the relevant IE in this signaling can be used to adjust and optimize the threshold as mentioned above . As shown in Figure 1C, it is a schematic diagram of a too late switching scene and a solution in an implementation manner.

The source base station determines whether the timeConnFailure-r16 carried by the terminal in the RLF report (representing the time from receiving the handover command to the final connection failure) is much greater than the pre-configured threshold (Tstore_UE_cntxt) or timeConnFailure-r16 does not appear in the report Determine if the terminal failure type is a too late switchover.

3. Switch to the wrong cell

The determination of the scene of switching to the wrong cell needs to meet two conditions:

(1) The terminal fails during the handover process or the terminal fails in the wireless link after camping in the target cell;

(2) The terminal reselects and accesses a third cell different from the source cell and the target cell.

This kind of handover error often occurs when the source base station misjudges the movement trajectory of the terminal, etc. or the cell coverage is irregular. Providing the radio link failure report to the source base station can provide a reference for the source base station to better select a handover target base station for the terminal under the condition that the source base station receives similar measurement reports in the future. As shown in FIG. 1D , it is a schematic diagram of a possible scenario of switching to a wrong cell and a solution.

In the example in FIG. 1D , when a handover failure occurs or a radio link failure occurs in the target cell, after reconnection, the terminal will send a radio link failure report to the current camping cell through the air interface. Then, the current serving base station will route its passing failure indication information signaling to potential multiple base stations including the base station where the terminal is located when the wireless link failure occurs (the PCI of a serving cell of these base stations matches the PCI carried in the terminal reconstruction request ). When the receiving base station verifies that the C-RNTI, failedPCellID and shortMAC-I carried in the signaling match its own information, it can be sure that the target base station of the signaling is itself. Afterwards, the target base station can determine that the base station (source base station) of the cell corresponding to the previous primary cell ID (previousPCellID) has reconnected by analyzing the information in the radio link failure report, such as timeConnFailure-r16, reestablishment cell ID (reestablishmentCellId), and The event of "handover to the wrong cell" was detected. Finally, the target base station sends a handover report containing indication information of "handover to the wrong cell" to the source cell.

Currently, the network does not know whether to optimize the location-based measurement reporting conditions for the network configuration, nor does it know whether the terminal will switch to the wrong cell too early, too late or switch to the wrong cell due to inappropriate network configuration conditions. How to optimize when the switching is unsuccessful. This application can design a terminal reporting process to help network devices adjust the distance-based measurement reporting conditions.

The technical solution of the embodiment of the present application can be applied to various communication systems, such as: Global System of Mobile communication (Global System of Mobile communication, GSM) system, code division multiple access (Code Division Multiple Access, CDMA) system, broadband code division multiple access (Wideband Code Division Multiple Access, WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, Advanced long term evolution (LTE-A) system , New Radio (NR) system, evolution system of NR system, LTE (LTE-based access to unlicensed spectrum, LTE-U) system on unlicensed spectrum, NR (NR-based access to unlicensed spectrum) on unlicensed spectrum unlicensed spectrum (NR-U) system, Non-Terrestrial Networks (NTN) system, Universal Mobile Telecommunications System (UMTS), Wireless Local Area Networks (WLAN), Wireless Fidelity (Wireless Fidelity, WiFi), fifth-generation communication (5th-Generation, 5G) system or other communication systems, etc.

Generally speaking, the number of connections supported by traditional communication systems is limited and easy to implement. However, with the development of communication technology, mobile communication systems will not only support traditional communication, but also support, for example, Device to Device (Device to Device, D2D) communication, Machine to Machine (M2M) communication, Machine Type Communication (MTC), Vehicle to Vehicle (V2V) communication, or Vehicle to everything (V2X) communication, etc. , the embodiments of the present application may also be applied to these communication systems.

Optionally, the communication system in the embodiment of the present application may be applied to a carrier aggregation (Carrier Aggregation, CA) scenario, may also be applied to a dual connectivity (Dual Connectivity, DC) scenario, and may also be applied to an independent (Standalone, SA) deployment Web scene.

Optionally, the communication system in the embodiment of the present application may be applied to an unlicensed spectrum, where the unlicensed spectrum may also be considered as a shared spectrum; or, the communication system in the embodiment of the present application may also be applied to a licensed spectrum, where, Licensed spectrum can also be considered as non-shared spectrum.

The embodiments of the present application describe various embodiments in conjunction with network equipment and terminal equipment, wherein the terminal equipment may also be referred to as user equipment (User Equipment, UE), 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 can be a station (STAION, ST) in the WLAN, a cellular phone, a cordless phone, a Session Initiation Protocol (Session Initiation Protocol, SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, a personal digital processing (Personal Digital Assistant, PDA) devices, handheld devices with wireless communication functions, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, next-generation communication systems such as terminal devices in NR networks, or future Terminal equipment in the evolved public land mobile network (Public Land Mobile Network, PLMN) network, etc.

In the embodiment of this application, the terminal device can be deployed on land, including indoor or outdoor, handheld, wearable or vehicle-mounted; it can also be deployed on water (such as ships, etc.); it can also be deployed in the air (such as aircraft, balloons and satellites) superior).

In this embodiment of the application, the terminal device may be a mobile phone (Mobile Phone), a tablet computer (Pad), a computer with a wireless transceiver function, a virtual reality (Virtual Reality, VR) terminal device, an augmented reality (Augmented Reality, AR) terminal Equipment, wireless terminal equipment in industrial control, wireless terminal equipment in self driving, wireless terminal equipment in remote medical, wireless terminal equipment in smart grid , wireless terminal equipment in transportation safety, wireless terminal equipment in smart city, or wireless terminal equipment in smart home.

As an example but not a limitation, in this embodiment of the present application, the terminal device may also be a wearable device. Wearable devices can also be called wearable smart devices, which 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 worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are not only a hardware device, but also achieve powerful functions through software support, data interaction, and cloud interaction. Generalized wearable smart devices include full-featured, large-sized, complete or partial functions without relying on smart phones, such as smart watches or smart glasses, etc., and only focus on a certain type of application functions, 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 the embodiment of the present application, the network device may be a device for communicating with the mobile device, and the network device may be an access point (Access Point, AP) in WLAN, a base station (Base Transceiver Station, BTS) in GSM or CDMA , or a base station (NodeB, NB) in WCDMA, or an evolved base station (Evolutional Node B, eNB or eNodeB) in LTE, or a relay station or access point, or a vehicle-mounted device, a wearable device, and an NR network The network equipment (gNB) in the network or the network equipment in the future evolved PLMN network or the network equipment in the NTN network, etc.

As an example but not a limitation, in this embodiment of the present application, the network device may have a mobile feature, for example, the network device may be a mobile device. Optionally, the network equipment may be a satellite or a balloon station. For example, the satellite can be a low earth orbit (low earth orbit, LEO) satellite, a medium earth orbit (medium earth orbit, MEO) satellite, a geosynchronous earth orbit (geosynchronous earth orbit, GEO) satellite, a high elliptical orbit (High Elliptical Orbit, HEO) satellite. ) Satellite etc. Optionally, the network device may also be a base station installed on land, water, and other locations.

In this embodiment of the present application, the network device may provide services for a cell, and the terminal device communicates with the network device through the transmission resources (for example, frequency domain resources, or spectrum resources) used by the cell, and the cell may be a network device ( For example, a cell corresponding to a base station), the cell may belong to a macro base station, or may belong to a base station corresponding to a small cell (Small cell), and the small cell here may include: a metro cell (Metro cell), a micro cell (Micro cell), a pico cell ( Pico cell), Femto cell, etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.

As shown in FIG. 2 , it is a system architecture diagram of a communication system applied in an embodiment of the present invention. The communication system may include a network device, and the network device may be a device for communicating with a terminal device (or called a communication terminal, terminal). A network device can provide communication coverage for a specific geographic area, and can communicate with terminal devices located within the coverage area. Figure 2 exemplarily shows one network device and two terminal devices. Optionally, the communication system may include multiple network devices and each network device may include other numbers of terminal devices within the coverage area. Examples are not limited to this. Optionally, the communication system may further include other network entities such as a network controller and a mobility management entity, which is not limited in this embodiment of the present application.

Wherein, the network equipment may further include access network equipment and core network equipment. That is, the wireless communication system also includes multiple core networks for communicating with access network devices. The access network device may be a long-term evolution (long-term evolution, LTE) system, a next-generation (mobile communication system) (next radio, NR) system or an authorized auxiliary access long-term evolution (LAA- Evolved base station (evolutional node B, abbreviated as eNB or e-NodeB) macro base station, micro base station (also called "small base station"), pico base station, access point (access point, AP), Transmission point (transmission point, TP) or new generation base station (new generation Node B, gNodeB), etc.

It should be understood that a device with a communication function in the network/system in the embodiment of the present application may be referred to as a communication device. Taking the communication system shown in Figure 2 as an example, the communication equipment may include network equipment and terminal equipment with communication functions, and the network equipment and terminal equipment may be the specific equipment described in the embodiments of the present invention, which will not be described in detail here; communication The device may also include other devices in the communication system, such as network controllers, mobility management entities and other network entities, which are not limited in this embodiment of the present application.

The following is a further description of the technical solution of the present application in the form of an embodiment. As shown in FIG. 3, it is a schematic diagram of an embodiment of the method for mobility robustness optimization in the embodiment of the present application, which may include:

301. The network device sends a distance-based measurement report condition, and the distance-based measurement report condition is used to determine whether to send a measurement report.

The terminal device receives distance-based measurement reporting conditions.

It can be understood that the network device here can be understood as a cell currently accessed by the terminal device, and can also be called a source cell. The source cell sends the distance-based measurement reporting condition to the terminal device. After receiving the distance-based measurement reporting condition sent by the source cell, the terminal device may determine whether to send a measurement report on the target cell according to the distance-based measurement reporting condition. That is, the network configures distance-based measurement reporting conditions for the terminal device.

Optionally, the distance-based measurement reporting conditions may include but not limited to:

(1) The first distance difference between the first distance and the second distance is greater than or equal to the first switching threshold; or,

(2) A second distance difference between the second distance and the first distance is less than or equal to a second switching threshold; or,

(3) The first distance is greater than or equal to a third switching threshold, and the second distance is less than or equal to a fourth switching threshold;

Wherein, the first distance is the distance between the terminal device and the reference point of the source cell, and the second distance is the distance between the terminal device and the reference point of the target cell.

Optionally, the reference point of the source cell is a center point of the source cell in the ground coverage area, and the reference point of the target cell is the center point of the target cell in the ground coverage area.

Optionally, position coordinates of the reference point of the source cell and the reference point of the target cell are configured by a network device.

Optionally, the location coordinates of the reference point of the source cell and the reference point of the target cell are broadcast by a network device or configured through RRC signaling.

302. The terminal device sends a measurement report when the distance-based measurement reporting condition is met.

The network device receives measurement reports.

It can be understood that, when the distance-based measurement report condition is satisfied, the terminal device sends a measurement report to the source cell, and the source cell receives the measurement report sent by the terminal device. If the distance-based measurement report condition is not met, the terminal device does not send a measurement report to the source cell.

Exemplarily, if the distance-based measurement reporting condition is: the first distance difference between the first distance and the second distance is greater than or equal to the first switching threshold. For example: the first handover threshold is 20km, the first distance between the terminal equipment and the reference point of the source cell is 50km, the second distance between the terminal equipment and the reference point of the target cell is 20km, and the first distance difference is 30. The first distance difference 30 is greater than the first handover threshold of 20 km, so the terminal device meets the distance-based measurement reporting condition, and can send a measurement report to the source cell.

If the distance-based measurement reporting condition is: a second distance difference between the second distance and the first distance is less than or equal to a second switching threshold. For example: the second handover threshold is -20km, the first distance between the terminal device and the reference point of the source cell is 50km, the second distance between the terminal device and the reference point of the target cell is 20km, and the second distance difference is obtained is -30, the second distance difference -30 is less than the second handover threshold -20km, so the terminal device meets the distance-based measurement report condition, and can send a measurement report to the source cell.

If the distance-based measurement reporting condition is: the first distance is greater than the third switching threshold, and the second distance is smaller than the fourth switching threshold. For example: the third handover threshold is 40km, the fourth handover threshold is 20km, the first distance between the terminal device and the reference point of the source cell is 50km, and the second distance between the terminal device and the reference point of the target cell is 19km, The first distance of 50 km is greater than the third handover threshold of 40 km, and the second distance of 19 km is less than the fourth handover threshold of 20 km. Therefore, the terminal device satisfies the distance-based measurement report condition and can send a measurement report to the source cell.

303. The network device sends a handover instruction, where the handover instruction carries resources for accessing the target cell, and the handover instruction is used to perform cell handover.

The terminal device receives a handover instruction, where the handover instruction carries resources for accessing a target cell.

304. The terminal device performs cell handover according to the handover instruction.

Exemplarily, the handover instruction may include RRC reconfiguration (Reconfiguration) signaling, and after receiving the RRC reconfiguration signaling, the terminal device starts a handover process, that is, performs cell handover.

It should be noted that steps 301-304 are optional steps.

305. The terminal device sends a radio link failure report, where the radio link failure report includes distance-related information, and the radio link failure report is used for mobility robustness optimization.

In the case of handover failure during the process of handover access to the target cell/radio link failure after completing access to the target cell, the terminal device sends a radio link failure report; the network device receives the radio link failure report, and the wireless Link failure reports include distance related information.

In the case of handover failure (handover failure) during the process of handover access to the target cell/radio link failure after completing access to the target cell, the terminal device sends a radio link failure report (RLF report) to the network device. According to the information carried in the radio link failure report, the network device can determine whether the handover performed by the terminal device belongs to the scene of premature handover, the scene of too late handover, or the scene of handover to the wrong cell.

Optionally, the wireless link failure report carries timeConnFailure-r16, and timeConnFailure-r16 represents the time from receiving the handover command to the final connection failure.

Optionally, the distance related information may include but not limited to at least one of the following:

1) Before the wireless link failure/handover failure occurs, the first distance difference between the first distance and the second distance measured by the terminal device;

2) Before the wireless link failure/handover failure occurs, the second distance difference between the second distance measured by the terminal device and the first distance;

3) Before the wireless link failure/handover failure occurs, the third distance difference between the first distance and the third distance measured by the terminal device;

4) Before the wireless link failure/handover failure occurs, the fourth distance difference between the third distance and the first distance measured by the terminal device;

5) The first distance measured by the terminal device before the wireless link failure/handover failure occurs;

6) Before the wireless link failure/handover failure occurs, the second distance measured by the terminal device;

7) Before the wireless link failure/handover failure occurs, the third distance measured by the terminal device;

Wherein, the first distance is the distance between the terminal device and the reference point of the source cell, the second distance is the distance between the terminal device and the reference point of the target cell, and the third The distance is the distance between the terminal device and reference points of other cells, and the other cells do not include the target cell. The number of other cells here is at least one.

It can be understood that the distance-related information reported by the terminal device includes the third distance difference, or the fourth distance difference, or the third distance, so that the network device can select other target cells that are more suitable for handover.

306. The network device adjusts a distance-based measurement reporting condition according to the distance-related information.

Optionally, the network device adjusts the distance-based measurement reporting condition according to the distance-related information, which may include:

1) In the case where it is determined to be a premature handover scenario according to the wireless link failure report, correspondingly adjust the handover threshold according to the distance-related information;

2) In the case where it is determined to be a too late handover scenario according to the radio link failure report, correspondingly adjust the handover threshold according to the distance-related information;

3) When it is determined according to the radio link failure report that the scene of handover to the wrong cell is determined, the handover threshold is correspondingly adjusted according to the distance-related information.

It can be understood that, in the case of the premature handover scenario and the late handover scenario, the network device correspondingly adjusts the handover threshold of the target cell, and in the case of handover to the wrong cell scene, the network device correspondingly adjusts the handover threshold of the target cell In addition, it is necessary to correspondingly adjust the handover threshold of the third-party cell for which the terminal device selects and accesses the cell.

1. The scene of premature switching

The network device configures distance-based measurement reporting conditions for the terminal device. After satisfying the distance-based measurement report condition, the terminal device sends the measurement report to the source base station. After coordinating with the target base station, the source base station sends RRCReconfiguration signaling carrying resources for accessing the target base station to the terminal device. After receiving the RRCReconfiguration signaling, the terminal device starts the handover process. If a handover failure occurs during the process of handover access to the target base station/RLF occurs after completing access to the target base station, then the terminal device accesses the source base station again, and the RLF The report is sent to the source base station. The source base station forwards the RLF report to the target base station, and the target base station can find that the terminal device has experienced premature handover through the above timer. Afterwards, the target base station sends the judgment result of premature handover to the source base station along with the RLF report. Finally, the source base station adjusts the distance-based measurement reporting condition configured for the terminal device according to the determination result. The following is an example of how the source base station adjusts the distance-based measurement reporting conditions, as follows:

1) Optionally, in the case where it is determined to be a premature handover scenario according to the radio link failure report, correspondingly adjusting the handover threshold according to the distance-related information may include:

(1) The distance-related information includes the first distance difference. If it is determined to be a premature handover scenario according to the wireless link failure report, according to the first distance difference, correspondingly increase the The first handover threshold of the target cell.

Exemplarily, it is assumed that the first switching threshold in the distance-based measurement reporting condition configured by the network device for the terminal device is 20 km. The handover performed by the terminal device belongs to the scenario of premature handover. The first distance difference measured by the terminal device when RLF/HOF occurs is 25km, where the first distance difference is the first distance between the terminal device and the reference point of the source cell. A distance, and a difference between a second distance between the terminal device and the reference point of the target cell. Then the network device adjusts the first switching threshold from 20km to 25km according to the first distance difference.

(2) The distance-related information includes the second distance difference, and if it is determined to be a premature handover scenario according to the wireless link failure report, correspondingly reduce the distance difference according to the second distance difference. The second handover threshold of the target cell.

Exemplarily, it is assumed that the second switching threshold in the distance-based measurement reporting condition configured by the network device for the terminal device is -20km. The handover performed by the terminal device belongs to the scenario of premature handover. The second distance difference measured by the terminal device when RLF/HOF occurs is -25km, where the second distance difference is the distance between the terminal device and the reference point of the target cell. The second distance is the difference between the first distance between the terminal device and the reference point of the source cell. Then the network device adjusts the second switching threshold from -20km to -25km according to the second distance difference.

(3) The distance-related information includes the first distance, and if it is determined to be a premature handover scenario according to the radio link failure report, correspondingly increase the second distance of the target cell according to the first distance Three switching thresholds.

Exemplarily, it is assumed that the third switching threshold in the distance-based measurement reporting condition configured by the network device for the terminal device is 40 km. The handover performed by the terminal device belongs to the scenario of premature handover, and the first distance measured by the terminal device when RLF/HOF occurs is 45km, where the first distance is the distance between the terminal device and the reference point of the source cell. Then the network device adjusts the third handover threshold from 40km to 45km.

(4) The distance-related information includes the second distance, and if it is determined to be a premature handover scenario according to the radio link failure report, correspondingly reduce the second distance of the target cell according to the second distance Four toggle thresholds.

Exemplarily, it is assumed that the fourth switching threshold in the distance-based measurement reporting condition configured by the network device for the terminal device is 20 km. The handover performed by the terminal device belongs to the scenario of premature handover, and the second distance measured by the terminal device when RLF/HOF occurs is 15 km, where the second distance is the distance between the terminal device and the reference point of the target cell. Then the network device adjusts the fourth handover threshold from 20km to 15km.

(5) The distance-related information includes the first distance and the second distance, and if it is determined to be a premature handover scenario according to the wireless link failure report, according to the second distance, the corresponding adjustment The third handover threshold related to the target cell is increased, and the fourth handover threshold related to the target cell is correspondingly decreased.

Exemplarily, it is assumed that the third handover threshold is 40km and the fourth handover threshold is 20km in the distance-based measurement report condition configured by the network device for the terminal device. The handover performed by the terminal device belongs to the scenario of premature handover. The first distance measured by the terminal device when RLF/HOF occurs is 45km, and the second distance measured is 15km, where the first distance is the distance between the terminal device and the source cell The distance between the reference points, the second distance is the distance between the terminal device and the reference point of the target cell. Then the network device adjusts the third handover threshold from 40km to 45km, and adjusts the fourth handover threshold from 20km to 15km.

2. Scenes switched too late

The network device configures distance-based measurement reporting conditions for the terminal device. The terminal device still cannot trigger the measurement report before leaving the source base station, and the terminal has RLF at the source base station. The terminal device performs cell selection and accesses a new cell. The terminal device sends the RLF report to the new base station. The new base station sends the RLF report to the source base station. The source base station finds that a too late handover has occurred according to the RLF report, and accordingly adjusts the distance-based measurement reporting conditions configured for the terminal device. The following is an example of how the source base station adjusts the distance-based measurement reporting conditions, as follows:

2) Optionally, in the case where it is determined to be a too late handover scenario according to the wireless link failure report, correspondingly adjusting the handover threshold according to the distance-related information may include:

(1) The distance-related information includes the first distance difference, and if it is determined to be a too late handover scenario according to the wireless link failure report, according to the first distance difference, correspondingly adjust the The first handover threshold of the target cell.

Exemplarily, it is assumed that the first switching threshold in the distance-based measurement reporting condition configured by the network device for the terminal device is 20 km. The handover performed by the terminal device belongs to the scene of too late handover. The first distance difference measured by the terminal device when RLF/HOF occurs is 15km, where the first distance difference is the first distance between the terminal device and the reference point of the source cell. A distance, and a difference between a second distance between the terminal device and the reference point of the target cell. Then the network device adjusts the first switching threshold from 20km to 15km according to the first distance difference.

(2) The distance-related information includes the second distance difference. If it is determined to be a too late handover scenario according to the wireless link failure report, according to the second distance difference, correspondingly increase the The second handover threshold of the target cell.

Exemplarily, it is assumed that the second switching threshold in the distance-based measurement reporting condition configured by the network device for the terminal device is -20km. The handover performed by the terminal device belongs to the scene of too late handover. The second distance difference measured by the terminal device when RLF/HOF occurs is -15km, where the second distance difference is the distance between the terminal device and the reference point of the target cell. The second distance is the difference between the first distance between the terminal device and the reference point of the source cell. Then the network device adjusts the second switching threshold from -20km to -15km according to the second distance difference.

(3) The distance-related information includes the first distance, and if it is determined to be a too late handover scenario according to the radio link failure report, correspondingly reduce the second distance of the target cell according to the first distance Three switching thresholds.

Exemplarily, it is assumed that the third switching threshold in the distance-based measurement reporting condition configured by the network device for the terminal device is 40 km. The handover performed by the terminal device belongs to the scene of too late handover, and the first distance measured by the terminal device when RLF/HOF occurs is 35km, where the first distance is the distance between the terminal device and the reference point of the source cell. Then the network device adjusts the third switching threshold from 40km to 35km.

(4) The distance-related information includes the second distance, and if it is determined to be a too late handover scenario according to the radio link failure report, correspondingly increase the second distance of the target cell according to the second distance Four toggle thresholds.

Exemplarily, it is assumed that the fourth switching threshold in the distance-based measurement reporting condition configured by the network device for the terminal device is 20 km. The handover performed by the terminal device belongs to the scene of too late handover, and the second distance measured by the terminal device when RLF/HOF occurs is 25km, wherein the second distance is the distance between the terminal device and the reference point of the target cell. Then the network device adjusts the fourth handover threshold from 20km to 25km.

(5) The distance-related information includes the first distance and the second distance, and if it is determined to be a too late handover scenario according to the wireless link failure report, according to the second distance, the corresponding adjustment The third handover threshold related to the target cell is smaller, and the fourth handover threshold related to the target cell is correspondingly increased.

Exemplarily, it is assumed that the third handover threshold is 40km and the fourth handover threshold is 20km in the distance-based measurement report condition configured by the network device for the terminal device. The handover performed by the terminal device belongs to the scene of too late handover. The first distance measured by the terminal device when RLF/HOF occurs is 35km, and the second distance measured is 25km, wherein the first distance is the distance between the terminal device and the source cell The distance between the reference points, the second distance is the distance between the terminal device and the reference point of the target cell. Then the network device adjusts the third handover threshold from 40km to 35km, and adjusts the fourth handover threshold from 20km to 25km.

3. Switch to the wrong cell scene

The network device configures distance-based measurement reporting conditions for the terminal device. After satisfying the distance-based measurement report condition, the terminal device sends the measurement report to the source base station. After coordinating with the target base station, the source base station sends RRCReconfiguration signaling carrying resources for accessing the target base station to the terminal device. After receiving the RRCReconfiguration signaling, the terminal device starts the handover process. If handover failure occurs during the process of handover access to the target base station/RLF occurs after accessing the target satellite base station, the terminal device undergoes cell selection or cell reselection to third-party base stations. After that, the terminal device sends the RLF report to the third-party satellite base station. The third-party base station forwards the RLF report to the target base station, and the target base station can find that the terminal device has experienced handover to the wrong cell through the above-mentioned timer and the ID of the third-party base station. Afterwards, the target base station sends the determination result of switching to the wrong cell to the source base station along with the RLF report. Finally, the source base station configures suitable measurement reporting conditions of the satellite base station for subsequent terminals according to the determination result. The following describes an example of the adjustment of the distance-based measurement reporting condition by the source base station.

3) Optionally, in the case where it is determined to be handed over to a wrong cell scenario according to the radio link failure report, correspondingly adjust the handover threshold according to the distance-related information, including:

In the case where it is determined to switch to a wrong cell scenario according to the radio link failure report, correspondingly adjust the handover threshold of the target cell and the handover threshold of the current serving cell according to the distance related information; or,

If it is determined to be a handover to a wrong cell scenario according to the radio link failure report, correspondingly adjust the handover threshold of the target cell and configure the handover threshold of the current serving cell according to the distance related information.

It should be noted that the current serving cell is a cell currently accessed by the terminal device.

1> The network device has previously configured the handover threshold of the target cell and the third-party cell. At this time, the handover threshold of the target cell and the third-party cell needs to be adjusted according to the reported distance-related information. Optionally, in the case where it is determined to be a scenario of handover to a wrong cell according to the radio link failure report, correspondingly adjust the handover threshold of the target cell and the handover threshold of the current serving cell according to the distance-related information, Can include:

(1) The distance-related information includes the first distance difference, and the distance-based measurement reporting condition includes the first handover threshold about the target cell and the first handover threshold about the third-party cell; In the link failure report, if it is determined to be a premature handover scenario, according to the first distance difference, the first handover threshold for the target cell is correspondingly increased, and the first handover threshold for the third-party cell is correspondingly decreased.

Exemplarily, it is assumed that in the distance-based measurement reporting conditions configured by the network device for the terminal device, the first handover threshold for the target cell is 20 km, and the first handover threshold for the third-party cell is 30 km. The handover performed by the terminal device belongs to the scenario of switching to the wrong cell. The first distance difference measured by the terminal device when RLF/HOF occurs is 25km, where the first distance difference is the first distance between the terminal device and the reference point of the source cell. A distance, and a difference between a second distance between the terminal device and the reference point of the target cell. Then the network device adjusts the first handover threshold of the target cell from 20km to 25km according to the first distance difference, and adjusts the first handover threshold of the third-party cell accessed by the terminal device from 30km to 25km.

(2) The distance-related information includes the second distance difference, and the distance-based measurement reporting condition includes a second handover threshold for the target cell and a second handover threshold for a third-party cell; If the link failure report is determined to be a premature handover scenario, according to the second distance difference, the second handover threshold for the target cell is correspondingly decreased, and the second handover threshold for the third-party cell is correspondingly increased.

Exemplarily, it is assumed that in the distance-based measurement report condition configured for the terminal device by the network device, the second handover threshold for the target cell is -20km, and the second handover threshold for the third-party cell is -30km. The handover performed by the terminal device belongs to the scenario of switching to the wrong cell. The second distance difference measured by the terminal device when RLF/HOF occurs is -25km, where the second distance difference is the distance between the terminal device and the reference point of the target cell. The second distance is the difference between the first distance between the terminal device and the reference point of the source cell. Then the network device adjusts the second handover threshold of the target cell from -20km to -25km according to the second distance difference, and adjusts the second handover threshold of the third-party cell accessed by the terminal equipment from -30km to -25km.

(3) The distance-related information includes the first distance, and the distance-based measurement reporting condition includes a third handover threshold for the target cell and a third handover threshold for a third-party cell; In the failure report, if it is determined to be a premature handover scenario, according to the first distance, the third handover threshold for the target cell is correspondingly increased, and the third handover threshold for the third-party cell is correspondingly decreased.

Exemplarily, it is assumed that in the distance-based measurement reporting conditions configured by the network device for the terminal device, the third handover threshold for the target cell is 40 km, and the third handover threshold for the third-party cell is 50 km. The handover performed by the terminal device belongs to the scenario of handing over to the wrong cell. The first distance measured by the terminal device when RLF/HOF occurs is 45km, where the first distance is the distance between the terminal device and the reference point of the source cell. Then the network device adjusts the third handover threshold of the target cell from 40km to 45km, and adjusts the third handover threshold of the third-party cell accessed by the terminal device from 50km to 45km.

(4) The distance-related information includes the second distance, and the distance-based measurement reporting condition includes a fourth handover threshold about the target cell and a fourth handover threshold about the third-party cell; In the failure report, if it is determined to be a premature handover scenario, according to the second distance, correspondingly decrease the fourth handover threshold for the target cell, and correspondingly increase the fourth handover threshold for the third-party cell.

Exemplarily, it is assumed that in the distance-based measurement reporting conditions configured by the network device for the terminal device, the fourth handover threshold for the target cell is 20 km, and the fourth handover threshold for the third-party cell is 10 km. The handover performed by the terminal device belongs to the scenario of switching to a wrong cell, and the second distance measured by the terminal device when RLF/HOF occurs is 15 km, where the second distance is the distance between the terminal device and the reference point of the target cell. Then the network device adjusts the fourth handover threshold of the target cell from 20km to 15km, and adjusts the third handover threshold of the third-party cell accessed by the terminal device from 10km to 15km.

(5) The distance-related information includes the first distance and the second distance, and the distance-based measurement reporting condition includes the third handover threshold and the fourth handover threshold about the target cell, and the third handover threshold about the third-party cell Three handover thresholds and a fourth handover threshold; in the case where it is determined to be a premature handover scenario according to the radio link failure report, according to the second distance, correspondingly increase the third handover threshold of the target cell, and correspondingly adjust Decreasing the fourth handover threshold for the target cell corresponds to decreasing the third handover threshold for the third-party cell, and correspondingly increasing the fourth handover threshold for the third-party cell.

Exemplarily, it is assumed that in the distance-based measurement reporting conditions configured by the network device for the terminal device, the third handover threshold for the target cell is 40km, and the fourth handover threshold is 20km; the third handover threshold for the third-party cell is 50km, and the fourth handover threshold is 20km. The four-handover threshold is 10km. The handover performed by the terminal device belongs to the scenario of switching to the wrong cell. The first distance measured by the terminal device when RLF/HOF occurs is 45km, and the second distance measured is 15km, where the first distance is the distance between the terminal device and the source cell The distance between the reference points, the second distance is the distance between the terminal device and the reference point of the target cell. Then the network device adjusts the third handover threshold of the target cell from 40km to 45km, adjusts the fourth handover threshold of the target cell from 20km to 15km, and adjusts the third handover threshold of the third-party cell accessed by the terminal device from 50km is 45km, and the fourth switching threshold is adjusted from 10km to 15km.

2> The network device has previously configured the handover threshold of the target cell, but has not configured the handover threshold of the third-party cell. At this time, it is necessary to adjust the handover threshold of the target cell according to the reported distance-related information, and configure the handover threshold of the third-party cell. Optionally, in the case where it is determined to be a scenario of handover to a wrong cell according to the radio link failure report, correspondingly adjust the handover threshold of the target cell and configure the handover threshold of the current serving cell according to the distance related information, Can include:

(1) The distance-related information includes the first distance difference, the distance-based measurement report condition includes the first handover threshold about the target cell, and does not include the first handover threshold about the third-party cell; according to the If the wireless link failure report is determined to be a premature handover scenario, according to the first distance difference, the first handover threshold for the target cell is correspondingly increased, and the first handover threshold for the third-party cell is correspondingly configured.

Exemplarily, it is assumed that the first handover threshold for the target cell in the distance-based measurement report condition configured by the network device for the terminal device is 20 km. The handover performed by the terminal device belongs to the scenario of switching to the wrong cell. The first distance difference measured by the terminal device when RLF/HOF occurs is 25km, where the first distance difference is the first distance between the terminal device and the reference point of the source cell. A distance, and a difference between a second distance between the terminal device and the reference point of the target cell. Then the network device adjusts the first handover threshold of the target cell from 20km to 25km according to the first distance difference, and configures the first handover threshold of the third-party cell accessed by the terminal device as 25km.

(2) The distance-related information includes the second distance difference, and the distance-based measurement report condition includes a second handover threshold about the target cell, and does not include a second handover threshold about a third-party cell; according to the If the radio link failure report is determined to be a premature handover scenario, according to the second distance difference, the second handover threshold for the target cell is correspondingly reduced, and the second handover threshold for the third-party cell is correspondingly configured.

Exemplarily, it is assumed that the second handover threshold for the target cell in the distance-based measurement report condition configured by the network device for the terminal device is -20km. The handover performed by the terminal device belongs to the scenario of switching to the wrong cell. The second distance difference measured by the terminal device when RLF/HOF occurs is -25km, where the second distance difference is the distance between the terminal device and the reference point of the target cell. The second distance is the difference between the first distance between the terminal device and the reference point of the source cell. Then the network device adjusts the second handover threshold of the target cell from -20km to -25km according to the second distance difference, and configures the second handover threshold of the third-party cell accessed by the terminal device as -25km.

(3) The distance-related information includes the first distance, and the distance-based measurement report condition includes the third handover threshold about the target cell, but does not include the third handover threshold about the third-party cell; If it is determined to be a premature handover scenario, according to the first distance, the third handover threshold for the target cell is correspondingly increased, and the third handover threshold for the third-party cell is correspondingly configured.

Exemplarily, it is assumed that the third handover threshold for the target cell in the distance-based measurement report condition configured by the network device for the terminal device is 40 km. The handover performed by the terminal device belongs to the scenario of handing over to the wrong cell. The first distance measured by the terminal device when RLF/HOF occurs is 45km, where the first distance is the distance between the terminal device and the reference point of the source cell. Then the network device adjusts the third handover threshold of the target cell from 40km to 45km, and configures the third handover threshold of the third-party cell accessed by the terminal device as 45km.

(4) The distance-related information includes the second distance, and the distance-based measurement reporting condition includes the fourth handover threshold of the target cell, but does not include the fourth handover threshold of the third-party cell; According to the report of road failure, if it is determined to be a premature handover scenario, according to the second distance, the fourth handover threshold for the target cell is correspondingly reduced, and the fourth handover threshold for the third-party cell is correspondingly configured.

Exemplarily, it is assumed that the fourth handover threshold for the target cell in the distance-based measurement report condition configured by the network device for the terminal device is 20 km. The handover performed by the terminal device belongs to the scenario of switching to a wrong cell, and the second distance measured by the terminal device when RLF/HOF occurs is 15 km, where the second distance is the distance between the terminal device and the reference point of the target cell. Then the network device adjusts the fourth handover threshold of the target cell from 20km to 15km, and configures the third handover threshold of the third-party cell accessed by the terminal device as 15km.

(5) The distance-related information includes the first distance and the second distance, and the distance-based measurement reporting condition includes the third handover threshold and the fourth handover threshold of the target cell, and does not include the third handover threshold of the third-party cell The third handover threshold and the fourth handover threshold; when it is determined to be a premature handover scenario according to the radio link failure report, according to the second distance, correspondingly increase the third handover threshold of the target cell, corresponding Decrease the fourth handover threshold for the target cell, correspondingly configure the third handover threshold for the third-party cell, and correspondingly configure the fourth handover threshold for the third-party cell.

Exemplarily, it is assumed that the third handover threshold for the target cell in the distance-based measurement report condition configured by the network device for the terminal device is 40 km, and the fourth handover threshold is 20 km. The handover performed by the terminal device belongs to the scenario of switching to the wrong cell. The first distance measured by the terminal device when RLF/HOF occurs is 45km, and the second distance measured is 15km, where the first distance is the distance between the terminal device and the source cell The distance between the reference points, the second distance is the distance between the terminal device and the reference point of the target cell. Then the network device adjusts the third handover threshold of the target cell from 40km to 45km, adjusts the fourth handover threshold of the target cell from 20km to 15km, and configures the third handover threshold of the third-party cell accessed by the terminal device to 45km , the fourth switching threshold is configured as 15km.

Optionally, after the network device adjusts the distance-based measurement reporting condition according to the distance-related information, it may send the adjusted distance-based measurement reporting condition to subsequent terminal devices, and the adjusted distance-based measurement reporting condition It is used for the subsequent terminal device to determine whether to send the measurement report. Wherein, the subsequent terminal device has a similar motion track to the terminal device, or the position of the subsequent terminal device is within a certain range from the position of the terminal device.

In the technical solution provided by the embodiment of the present application, the terminal device sends a radio link failure report, the radio link failure report includes distance-related information, and the radio link failure report is used for mobility robustness optimization. The network device receives the wireless link failure report; the network device adjusts the distance-based measurement reporting condition according to the distance-related information. That is, it helps network devices to adjust distance-based measurement reporting conditions to achieve mobility robustness optimization.

As shown in Figure 4, it is a schematic diagram of an embodiment of the terminal device in the embodiment of the present application, which may include:

The transceiver module 401 is configured to send a radio link failure report, the radio link failure report includes distance-related information, and the radio link failure report is used for mobility robustness optimization.

Optionally, the distance-related information includes at least one of the following:

Before the wireless link failure/handover failure occurs, the first distance difference between the first distance and the second distance measured by the terminal device;

A second distance difference between the second distance measured by the terminal device and the first distance before the wireless link failure/handover failure occurs;

A third distance difference between the first distance and the third distance measured by the terminal device before the wireless link failure/handover failure occurs;

A fourth distance difference between the third distance and the first distance measured by the terminal device before the wireless link failure/handover failure occurs;

The first distance measured by the terminal device before the radio link failure/handover failure occurs;

The second distance measured by the terminal device before the radio link failure/handover failure occurs;

Before the wireless link failure/handover failure occurs, the third distance measured by the terminal device;

Wherein, the first distance is the distance between the terminal device and the reference point of the source cell, the second distance is the distance between the terminal device and the reference point of the target cell, and the third distance is The distance between the terminal device and reference points of other cells, the other cells not including the target cell.

Optionally, the transceiver module 401 is also configured to receive a distance-based measurement report condition; when the distance-based measurement report condition is met, send a measurement report; receive a handover instruction, the handover instruction carries an access target cell H;

The processing module 402 is configured to perform cell handover according to the handover instruction.

Optionally, the distance-based measurement reporting conditions include:

A first distance difference between the first distance and the second distance is greater than or equal to a first switching threshold; or,

a second distance difference between the second distance and the first distance is less than or equal to a second switching threshold; or,

The first distance is greater than or equal to a third switching threshold, and the second distance is less than or equal to a fourth switching threshold;

Optionally, the reference point of the source cell is the center point of the source cell in the ground coverage area, and the reference point of the target cell is the center point of the target cell in the ground coverage area.

As shown in Figure 5, it is a schematic diagram of an embodiment of a network device in the embodiment of the present application, which may include:

A transceiver module 501, configured to receive a wireless link failure report, where the wireless link failure report includes distance-related information;

A processing module 502, configured to adjust distance-based measurement reporting conditions according to the distance-related information.

Optionally, the transceiver module 501 is further configured to send a distance-based measurement report condition, and the distance-based measurement report condition is used to determine whether to send a measurement report; receive a measurement report; send a switching instruction, and the switching instruction carries an access resources of the target cell, and the handover instruction is used to perform cell handover.

Optionally, the distance-based measurement reporting conditions include:

Optionally, the processing module 502 is specifically configured to adjust the handover threshold correspondingly according to the distance-related information in a case where it is determined to be a premature handover scenario according to the wireless link failure report; According to the failure report, if it is determined that the handover scenario is too late, adjust the handover threshold correspondingly according to the distance related information; For relevant information, adjust the switching threshold accordingly.

As shown in Figure 6, it is a schematic diagram of another embodiment of the terminal device in the embodiment of the present application, which may include:

The terminal device is described by taking a mobile phone as an example, and may include: a radio frequency (radio frequency, RF) circuit 610, a memory 620, an input unit 630, a display unit 640, a sensor 650, an audio circuit 660, and a wireless fidelity (wireless fidelity, WiFi) module 670, processor 680, and power supply 690 and other components. Wherein, the radio frequency circuit 610 includes a receiver 614 and a transmitter 612 . Those skilled in the art can understand that the structure of the mobile phone shown in FIG. 6 does not constitute a limitation to the mobile phone, and may include more or less components than shown in the figure, or combine some components, or arrange different components.

The following is a specific introduction to each component of the mobile phone in conjunction with Figure 6:

The RF circuit 610 can be used for sending and receiving information or receiving and sending signals during a call. In particular, after receiving the downlink information of the base station, it is processed by the processor 680; in addition, the designed uplink data is sent to the base station. Generally, the RF circuit 610 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier (low noise amplifier, LNA), a duplexer, and the like. In addition, RF circuitry 610 may also communicate with networks and other devices via wireless communications. The above wireless communication can use any communication standard or protocol, including but not limited to global system of mobile communication (global system of mobile communication, GSM), general packet radio service (general packet radio service, GPRS), code division multiple access (code division multiple access) multiple access (CDMA), wideband code division multiple access (WCDMA), long term evolution (LTE), e-mail, short message service (short messaging service, SMS), etc.

The memory 620 can be used to store software programs and modules, and the processor 680 executes various functional applications and data processing of the mobile phone by running the software programs and modules stored in the memory 620 . The memory 620 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application program required by a function (such as a sound playback function, an image playback function, etc.); Data created by the use of mobile phones (such as audio data, phonebook, etc.), etc. In addition, the memory 620 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage devices.

The input unit 630 can be used to receive input numbers or character information, and generate key signal input related to user settings and function control of the mobile phone. Specifically, the input unit 630 may include a touch panel 631 and other input devices 632 . The touch panel 631, also referred to as a touch screen, can collect the user's touch operations on or near it (for example, the user uses any suitable object or accessory such as a finger or a stylus on the touch panel 631 or near the touch panel 631). operation), and drive the corresponding connection device according to the preset program. Optionally, the touch panel 631 may include two parts, a touch detection device and a touch controller. Among them, the touch detection device detects the user's touch orientation, and detects the signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts it into contact coordinates, and sends it to the to the processor 680, and can receive and execute commands sent by the processor 680. In addition, the touch panel 631 can be implemented in various types such as resistive, capacitive, infrared, and surface acoustic wave. In addition to the touch panel 631 , the input unit 630 may also include other input devices 632 . Specifically, other input devices 632 may include, but are not limited to, one or more of physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, joysticks, and the like.

The display unit 640 may be used to display information input by or provided to the user and various menus of the mobile phone. The display unit 640 may include a display panel 641. Optionally, the display panel 641 may be configured in the form of a liquid crystal display (liquid crystal display, LCD), an organic light-emitting diode (organic light-Emitting diode, OLED), or the like. Further, the touch panel 631 may cover the display panel 641, and when the touch panel 631 detects a touch operation on or near it, it transmits to the processor 680 to determine the type of the touch event, and then the processor 680 determines the type of the touch event according to the The type provides a corresponding visual output on the display panel 641 . Although in FIG. 6, the touch panel 631 and the display panel 641 are used as two independent components to realize the input and input functions of the mobile phone, in some embodiments, the touch panel 631 and the display panel 641 can be integrated to form a mobile phone. Realize the input and output functions of the mobile phone.

The handset may also include at least one sensor 650, such as a light sensor, motion sensor, and other sensors. Specifically, the light sensor can include an ambient light sensor and a proximity sensor, wherein the ambient light sensor can adjust the brightness of the display panel 641 according to the brightness of the ambient light, and the proximity sensor can turn off the display panel 641 and/or when the mobile phone is moved to the ear. or backlight. As a kind of motion sensor, the accelerometer sensor can detect the magnitude of acceleration in various directions (generally three axes), and can detect the magnitude and direction of gravity when it is stationary, and can be used for applications that recognize the posture of mobile phones (such as horizontal and vertical screen switching, related Games, magnetometer attitude calibration), vibration recognition related functions (such as pedometer, tap), etc.; as for other sensors such as gyroscope, barometer, hygrometer, thermometer, infrared sensor, etc. repeat.

The audio circuit 660, the speaker 661 and the microphone 662 can provide an audio interface between the user and the mobile phone. The audio circuit 660 can transmit the electrical signal converted from the received audio data to the speaker 661, and the speaker 661 converts it into an audio signal output; After being received, it is converted into audio data, and then the audio data is processed by the output processor 680, and then sent to another mobile phone through the RF circuit 610, or the audio data is output to the memory 620 for further processing.

WiFi is a short-distance wireless transmission technology. The mobile phone can help users send and receive emails, browse web pages, and access streaming media through the WiFi module 670, which provides users with wireless broadband Internet access. Although FIG. 6 shows a WiFi module 670, it can be understood that it is not an essential component of the mobile phone, and can be completely omitted as required without changing the essence of the invention.

The processor 680 is the control center of the mobile phone. It uses various interfaces and lines to connect various parts of the entire mobile phone. By running or executing software programs and/or modules stored in the memory 620, and calling data stored in the memory 620, execution Various functions and processing data of the mobile phone, so as to monitor the mobile phone as a whole. Optionally, the processor 680 may include one or more processing units; preferably, the processor 680 may integrate an application processor and a modem processor, wherein the application processor mainly processes operating systems, user interfaces, and application programs, etc. , the modem processor mainly handles wireless communications. It can be understood that the foregoing modem processor may not be integrated into the processor 680 .

The mobile phone also includes a power supply 690 (such as a battery) for supplying power to various components. Preferably, the power supply can be logically connected to the processor 680 through the power management system, so as to realize functions such as managing charging, discharging, and power consumption management through the power management system. Although not shown, the mobile phone may also include a camera, a Bluetooth module, etc., which will not be repeated here.

In the embodiment of the present application, the RF circuit 610 is configured to send a radio link failure report, where the radio link failure report includes distance-related information, and the radio link failure report is used for mobility robustness optimization.

Optionally, the RF circuit 610 is also configured to receive a distance-based measurement report condition; when the distance-based measurement report condition is satisfied, send a measurement report; receive a handover instruction, the handover instruction carries an access target cell H;

The processor 680 is configured to execute cell handover according to the handover instruction.

Optionally, the distance-based measurement reporting conditions include:

As shown in FIG. 7, it is a schematic diagram of another embodiment of the network device in the embodiment of the present application, which may include:

A memory 701 storing executable program codes;

a transceiver 702 and a processor 703 coupled to the memory 701;

A transceiver 702, configured to receive a wireless link failure report, where the wireless link failure report includes distance-related information;

The processor 703 is configured to adjust a distance-based measurement reporting condition according to the distance-related information.

Optionally, the transceiver 702 is also used to send a distance-based measurement report condition, and the distance-based measurement report condition is used to determine whether to send a measurement report; receive a measurement report; send a switching instruction, and the switching instruction carries an access resources of the target cell, and the handover instruction is used to perform cell handover.

Optionally, the distance-based measurement reporting conditions include:

Optionally, the processor 703 is specifically configured to adjust a handover threshold correspondingly according to the distance-related information in a case where it is determined to be a premature handover scenario according to the wireless link failure report; According to the failure report, if it is determined that the handover scenario is too late, adjust the handover threshold correspondingly according to the distance related information; For relevant information, adjust the switching threshold accordingly.

In the above embodiments, all or part of them may be implemented by software, hardware, firmware or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, all or part of the processes or functions according to the embodiments of the present invention will be generated. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website, computer, server, or data center Transmission to another website site, computer, server, or data center by wired (eg, coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be stored by a computer, or a data storage device such as a server or a data center integrated with one or more available media. The available medium may be a magnetic medium (for example, a floppy disk, a hard disk, or a magnetic tape), an optical medium (for example, DVD), or a semiconductor medium (for example, a Solid State Disk (SSD)).

The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and not necessarily Used to describe a specific sequence or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

Claims

A method for robustness optimization of mobility, comprising:

The terminal device sends a radio link failure report, where the radio link failure report includes distance-related information, and the radio link failure report is used for mobility robustness optimization.
The method according to claim 1, wherein the distance-related information includes at least one of the following:

Before the wireless link failure/handover failure occurs, the first distance difference between the first distance and the second distance measured by the terminal device;

A second distance difference between the second distance measured by the terminal device and the first distance before the wireless link failure/handover failure occurs;

A third distance difference between the first distance and the third distance measured by the terminal device before the wireless link failure/handover failure occurs;

A fourth distance difference between the third distance and the first distance measured by the terminal device before the wireless link failure/handover failure occurs;

The first distance measured by the terminal device before the radio link failure/handover failure occurs;

The second distance measured by the terminal device before the radio link failure/handover failure occurs;

Before the wireless link failure/handover failure occurs, the third distance measured by the terminal device;

Wherein, the first distance is the distance between the terminal device and the reference point of the source cell, the second distance is the distance between the terminal device and the reference point of the target cell, and the third distance is The distance between the terminal device and reference points of other cells, the other cells not including the target cell.
The method according to claim 1 or 2, wherein before the terminal device sends the failure report, the method further comprises:

The terminal device receives distance-based measurement reporting conditions;

The terminal device sends a measurement report when the distance-based measurement reporting condition is met;

The terminal device receives a handover instruction, where the handover instruction carries resources for accessing the target cell;

The terminal device executes cell handover according to the handover instruction.
The method according to claim 3, wherein the distance-based measurement reporting conditions include:

A first distance difference between the first distance and the second distance is greater than or equal to a first switching threshold; or,

a second distance difference between the second distance and the first distance is less than or equal to a second switching threshold; or,

The first distance is greater than or equal to a third switching threshold, and the second distance is less than or equal to a fourth switching threshold;

Wherein, the first distance is the distance between the terminal device and the reference point of the source cell, and the second distance is the distance between the terminal device and the reference point of the target cell.
The method according to any one of claims 1-4, wherein the reference point of the source cell is the center point of the source cell's ground coverage area, and the reference point of the target cell is the center point of the ground coverage area of the target cell. The center point of the range.
The method according to claim 5, wherein the position coordinates of the reference point of the source cell and the reference point of the target cell are configured by network equipment.
A method for robustness optimization of mobility, comprising:

The network device receives a wireless link failure report, where the wireless link failure report includes distance-related information;

The network device adjusts a distance-based measurement reporting condition according to the distance-related information.
The method according to claim 7, wherein the distance-related information includes at least one of the following:

Before the wireless link failure/handover failure occurs, the first distance difference between the first distance and the second distance measured by the terminal device;

A second distance difference between the second distance measured by the terminal device and the first distance before the wireless link failure/handover failure occurs;

A third distance difference between the first distance and the third distance measured by the terminal device before the wireless link failure/handover failure occurs;

A fourth distance difference between the third distance and the first distance measured by the terminal device before the wireless link failure/handover failure occurs;

The first distance measured by the terminal device before the radio link failure/handover failure occurs;

The second distance measured by the terminal device before the radio link failure/handover failure occurs;

Before the wireless link failure/handover failure occurs, the third distance measured by the terminal device;

Wherein, the first distance is the distance between the terminal device and the reference point of the source cell, the second distance is the distance between the terminal device and the reference point of the target cell, and the third distance is The distance between the terminal device and reference points of other cells, the other cells not including the target cell.
The method according to claim 7 or 8, wherein before the network device receives the wireless link failure report, the method further comprises:

The network device sends a distance-based measurement report condition, and the distance-based measurement report condition is used to determine whether to send a measurement report;

The network device receives a measurement report;

The network device sends a handover instruction, where the handover instruction carries resources for accessing a target cell, and the handover instruction is used to perform cell handover.
The method according to claim 9, wherein the distance-based measurement reporting conditions include:

A first distance difference between the first distance and the second distance is greater than or equal to a first switching threshold; or,

a second distance difference between the second distance and the first distance is less than or equal to a second switching threshold; or,

The first distance is greater than or equal to a third switching threshold, and the second distance is less than or equal to a fourth switching threshold;

Wherein, the first distance is the distance between the terminal device and the reference point of the source cell, and the second distance is the distance between the terminal device and the reference point of the target cell.
The method according to any one of claims 7-10, wherein the network device adjusts the distance-based measurement reporting condition according to the distance-related information, including:

In the case where it is determined to be a premature handover scenario according to the wireless link failure report, correspondingly adjust the handover threshold according to the distance-related information;

If it is determined to be a too late handover scenario according to the radio link failure report, correspondingly adjust the handover threshold according to the distance-related information;

If it is determined according to the wireless link failure report that the scene of handover to the wrong cell is determined, the handover threshold is correspondingly adjusted according to the distance-related information.
The method according to any one of claims 7-11, wherein the reference point of the source cell is the center point of the source cell's ground coverage area, and the reference point of the target cell is the center point of the ground coverage area of the target cell. The center point of the range.
The method according to claim 12, characterized in that the position coordinates of the reference point of the source cell and the reference point of the target cell are configured by network equipment.
A terminal device, characterized in that it includes:

A transceiver module, configured to send a radio link failure report, where the radio link failure report includes distance-related information, and the radio link failure report is used for mobility robustness optimization.
The terminal device according to claim 14, wherein the distance-related information includes at least one of the following:

Before the wireless link failure/handover failure occurs, the first distance difference between the first distance and the second distance measured by the terminal device;

A second distance difference between the second distance measured by the terminal device and the first distance before the wireless link failure/handover failure occurs;

A third distance difference between the first distance and the third distance measured by the terminal device before the wireless link failure/handover failure occurs;

A fourth distance difference between the third distance and the first distance measured by the terminal device before the wireless link failure/handover failure occurs;

The first distance measured by the terminal device before the radio link failure/handover failure occurs;

The second distance measured by the terminal device before the radio link failure/handover failure occurs;

Before the wireless link failure/handover failure occurs, the third distance measured by the terminal device;

Wherein, the first distance is the distance between the terminal device and the reference point of the source cell, the second distance is the distance between the terminal device and the reference point of the target cell, and the third distance is The distance between the terminal device and reference points of other cells, the other cells not including the target cell.
The terminal device according to claim 14 or 15, characterized in that,

The transceiver module is further configured to receive a distance-based measurement report condition; when the distance-based measurement report condition is satisfied, send a measurement report; receive a handover instruction, the handover instruction carries resources for accessing a target cell;

A processing module, configured to perform cell handover according to the handover instruction.
The terminal device according to claim 16, wherein the distance-based measurement reporting conditions include:

A first distance difference between the first distance and the second distance is greater than or equal to a first switching threshold; or,

a second distance difference between the second distance and the first distance is less than or equal to a second switching threshold; or,

The first distance is greater than or equal to a third switching threshold, and the second distance is less than or equal to a fourth switching threshold;

Wherein, the first distance is the distance between the terminal device and the reference point of the source cell, and the second distance is the distance between the terminal device and the reference point of the target cell.
The terminal device according to any one of claims 14-17, wherein the reference point of the source cell is the center point of the source cell on the ground coverage, and the reference point of the target cell is the center point of the target cell on the ground. The center point of coverage.
The terminal device according to claim 18, wherein the position coordinates of the reference point of the source cell and the reference point of the target cell are configured by a network device.
A network device, characterized in that it includes:

A transceiver module, configured to receive a wireless link failure report, where the wireless link failure report includes distance-related information;

A processing module, configured to adjust distance-based measurement reporting conditions according to the distance-related information.
The network device according to claim 20, wherein the distance-related information includes at least one of the following:

Before the wireless link failure/handover failure occurs, the first distance difference between the first distance and the second distance measured by the terminal device;

A second distance difference between the second distance measured by the terminal device and the first distance before the wireless link failure/handover failure occurs;

A third distance difference between the first distance and the third distance measured by the terminal device before the wireless link failure/handover failure occurs;

A fourth distance difference between the third distance and the first distance measured by the terminal device before the wireless link failure/handover failure occurs;

The first distance measured by the terminal device before the radio link failure/handover failure occurs;

The second distance measured by the terminal device before the radio link failure/handover failure occurs;

Before the wireless link failure/handover failure occurs, the third distance measured by the terminal device;

Wherein, the first distance is the distance between the terminal device and the reference point of the source cell, the second distance is the distance between the terminal device and the reference point of the target cell, and the third distance is The distance between the terminal device and reference points of other cells, the other cells not including the target cell.
The network device according to claim 20 or 21, characterized in that,

The transceiver module is also used to send a distance-based measurement report condition, the distance-based measurement report condition is used to determine whether to send a measurement report; receive a measurement report; send a handover instruction, the handover instruction carries access to the target cell resources, and the handover instruction is used to perform cell handover.
The network device according to claim 22, wherein the distance-based measurement reporting conditions include:

A first distance difference between the first distance and the second distance is greater than or equal to a first switching threshold; or,

a second distance difference between the second distance and the first distance is less than or equal to a second switching threshold; or,

The first distance is greater than or equal to a third switching threshold, and the second distance is less than or equal to a fourth switching threshold;

Wherein, the first distance is the distance between the terminal device and the reference point of the source cell, and the second distance is the distance between the terminal device and the reference point of the target cell.
The network device according to any one of claims 20-23, characterized in that,

The processing module is specifically configured to adjust a handover threshold correspondingly according to the distance-related information in a case where it is determined to be a premature handover scenario according to the wireless link failure report; and according to the wireless link failure report, If it is determined that the handover scenario is too late, according to the distance-related information, correspondingly adjust the handover threshold; if it is determined according to the wireless link failure report that the scene is handed over to a wrong cell, according to the distance-related information, Adjust the switching threshold accordingly.
The network device according to any one of claims 20-24, wherein the reference point of the source cell is the center point of the source cell on the ground coverage, and the reference point of the target cell is the center point of the target cell on the ground. The center point of coverage.
The network device according to claim 25, wherein the position coordinates of the reference point of the source cell and the reference point of the target cell are configured by the network device.
A terminal device, characterized in that it includes:

a memory storing executable program code;

a transceiver and a processor coupled to the memory;

The transceiver is configured to send a radio link failure report, the radio link failure report includes distance-related information, and the radio link failure report is used for mobility robustness optimization.
The terminal device according to claim 27, wherein the distance-related information includes at least one of the following:

Before the wireless link failure/handover failure occurs, the first distance difference between the first distance and the second distance measured by the terminal device;

A second distance difference between the second distance measured by the terminal device and the first distance before the wireless link failure/handover failure occurs;

A third distance difference between the first distance and the third distance measured by the terminal device before the wireless link failure/handover failure occurs;

A fourth distance difference between the third distance and the first distance measured by the terminal device before the wireless link failure/handover failure occurs;

The first distance measured by the terminal device before the radio link failure/handover failure occurs;

The second distance measured by the terminal device before the radio link failure/handover failure occurs;

Before the wireless link failure/handover failure occurs, the third distance measured by the terminal device;

Wherein, the first distance is the distance between the terminal device and the reference point of the source cell, the second distance is the distance between the terminal device and the reference point of the target cell, and the third distance is The distance between the terminal device and reference points of other cells, the other cells not including the target cell.
The terminal device according to claim 27 or 28, characterized in that,

The transceiver is further configured to receive a distance-based measurement report condition; when the distance-based measurement report condition is satisfied, send a measurement report; receive a handover instruction, the handover instruction carries resources for accessing a target cell;

The processor is configured to execute cell handover according to the handover instruction.
The terminal device according to claim 29, wherein the distance-based measurement reporting conditions include:

A first distance difference between the first distance and the second distance is greater than or equal to a first switching threshold; or,

a second distance difference between the second distance and the first distance is less than or equal to a second switching threshold; or,

The first distance is greater than or equal to a third switching threshold, and the second distance is less than or equal to a fourth switching threshold;

Wherein, the first distance is the distance between the terminal device and the reference point of the source cell, and the second distance is the distance between the terminal device and the reference point of the target cell.
The terminal device according to any one of claims 27-30, wherein the reference point of the source cell is the center point of the source cell on the ground coverage, and the reference point of the target cell is the center point of the target cell on the ground. The center point of coverage.
The terminal device according to claim 31, wherein the position coordinates of the reference point of the source cell and the reference point of the target cell are configured by a network device.
A network device, characterized in that it includes:

a memory storing executable program code;

a transceiver and a processor coupled to the memory;

The transceiver is configured to receive a wireless link failure report, where the wireless link failure report includes distance-related information;

The processor is configured to adjust distance-based measurement reporting conditions according to the distance-related information.
The network device according to claim 33, wherein the distance-related information includes at least one of the following:

Before the wireless link failure/handover failure occurs, the first distance difference between the first distance and the second distance measured by the terminal device;

A second distance difference between the second distance measured by the terminal device and the first distance before the wireless link failure/handover failure occurs;

A third distance difference between the first distance and the third distance measured by the terminal device before the wireless link failure/handover failure occurs;

A fourth distance difference between the third distance and the first distance measured by the terminal device before the wireless link failure/handover failure occurs;

The first distance measured by the terminal device before the radio link failure/handover failure occurs;

The second distance measured by the terminal device before the radio link failure/handover failure occurs;

Before the wireless link failure/handover failure occurs, the third distance measured by the terminal device;

Wherein, the first distance is the distance between the terminal device and the reference point of the source cell, the second distance is the distance between the terminal device and the reference point of the target cell, and the third distance is The distance between the terminal device and reference points of other cells, the other cells not including the target cell.
The network device according to claim 33 or 34, characterized in that,

The transceiver is also used to send a distance-based measurement report condition, and the distance-based measurement report condition is used to determine whether to send a measurement report; receive a measurement report; send a handover instruction, and the handover instruction carries the access to the target cell resources, and the handover instruction is used to perform cell handover.
The network device according to claim 35, wherein the distance-based measurement reporting conditions include:

A first distance difference between the first distance and the second distance is greater than or equal to a first switching threshold; or,

a second distance difference between the second distance and the first distance is less than or equal to a second switching threshold; or,

The first distance is greater than or equal to a third switching threshold, and the second distance is less than or equal to a fourth switching threshold;

Wherein, the first distance is the distance between the terminal device and the reference point of the source cell, and the second distance is the distance between the terminal device and the reference point of the target cell.
The network device according to any one of claims 33-36, characterized in that,

The processor is specifically configured to adjust a handover threshold correspondingly according to the distance-related information in a case where the scene is determined to be a premature handover according to the radio link failure report; and according to the radio link failure report, If it is determined that the handover scenario is too late, according to the distance-related information, correspondingly adjust the handover threshold; if it is determined according to the wireless link failure report that the scene is handed over to a wrong cell, according to the distance-related information, Adjust the switching threshold accordingly.
The network device according to any one of claims 33-37, wherein the reference point of the source cell is the center point of the source cell on the ground coverage, and the reference point of the target cell is the center point of the target cell on the ground. The center point of coverage.
The network device according to claim 38, wherein the position coordinates of the reference point of the source cell and the reference point of the target cell are configured by the network device.
A computer-readable storage medium, comprising instructions, which, when run on a processor, cause the processor to execute the method according to any one of claims 1-6, or any one of claims 7-13.