Patent Application
20240147338
This application pertains to the field of communication technologies, and relates to a method and an apparatus for optimizing CHO configuration information.
In a process in which a terminal performs conditional handover (CHO), if a radio link failure (RLF) occurs between the terminal and a cell, the terminal needs to report some related information to a network side device, and the network side device analyzes whether a parameter of a CHO execution condition configured for the terminal and a configured CHO candidate cell list is reasonable, so that the network side device optimizes CHO configuration information, thereby improving a success probability of handover of the terminal.
However, in the CHO process or after the CHO process (for example, an RLF occurs after the terminal is handed over to a CHO candidate cell), it is difficult for the terminal to determine to send related information of updating a CHO configuration to the corresponding network side device that needs to update the CHO configuration information. Consequently, a success rate of updating the CHO configuration information is not high.
Embodiments of this application provide a method and an apparatus for optimizing CHO configuration information.
According to a first aspect, a method for optimizing CHO configuration information is provided, and the method includes:
According to a second aspect, a method for processing CHO configuration information is provided, and the method includes:
According to a third aspect, a method for triggering optimization of CHO configuration information is provided, and the method includes:
According to a fourth aspect, an apparatus for optimizing CHO configuration information is provided, and the apparatus includes:
According to a fifth aspect, an apparatus for processing CHO configuration information is provided, and the apparatus includes:
According to a sixth aspect, an apparatus for triggering optimization of CHO configuration information is provided, and the apparatus includes:
According to a seventh aspect, a terminal is provided. The terminal includes a processor, a memory, and a program or an instruction stored in the memory and executable on the processor, and the program or the instruction is executed by the processor to implement the steps of the method according to the third aspect.
According to an eighth aspect, a terminal is provided, including a processor and a communication interface, where the communication interface is configured to: receive conditional handover CHO configuration information sent by a source network side device; and send a radio resource control RRC message to a target network side device when the terminal encounters a radio link failure RLF.
According to a ninth aspect, a network side device is provided. The network side device includes a processor, a memory, and a program or an instruction stored in the memory and executable on the processor, and the program or the instruction is executed by the processor to implement the steps of the method according to the first aspect or the second aspect.
According to a tenth aspect, a network side device is provided, including a processor and a communication interface, where the processor and/or the communication interface are/is configured to implement the steps of the method according to the first aspect or the second aspect.
According to an eleventh aspect, a non-transitory readable storage medium is provided. The non-transitory readable storage medium stores a program or an instruction, and the program or the instruction is executed by a processor to implement the steps of the method according to the first aspect, the second aspect, or the third aspect.
According to a twelfth aspect, a chip is provided. The chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to run a program or an instruction to implement the steps of the method according to the first aspect, or the steps of the method according to the second aspect, or the steps of the method according to the third aspect.
According to a thirteenth aspect, a computer program/program product is provided. The computer program/program product is stored in a non-transient storage medium, and the program/program product is executed by at least one processor to implement the steps of the method according to the first aspect, the steps of the method according to the second aspect, or the steps of the method according to the third aspect.
The following clearly describes the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Apparently, the described embodiments are some but not all of the embodiments of this application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of this application shall fall within the protection scope of this application.
In the specification and claims of this application, the terms “first”, “second”, and the like are intended to distinguish between similar objects but do not describe a specific order or sequence. It should be understood that, the terms used in such a way is interchangeable in proper circumstances, so that the embodiments of this application can be implemented in an order other than the order illustrated or described herein. Objects classified by “first” and “second” are usually of a same type, and the number of objects is not limited. For example, there may be one or more first objects. In addition, in the specification and the claims, “and/or” represents at least one of connected objects, and a character “I” generally represents an “or” relationship between associated objects.
It should be noted that, the technologies described in the embodiments of this application are not limited to a Long Term Evolution (LTE)/LTE-Advanced (LTE-A) system, and can also be used in other wireless communication systems such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA), and another system. The terms “system” and “network” in the embodiments of this application may be used interchangeably. The technologies described can be applied to both the systems and the radio technologies mentioned above as well as to other systems and radio technologies. The following descriptions describe a new radio (NR) system for example purposes, and NR terms are used in most of the following descriptions, but these technologies can also be applied to an application other than an NR system application, for example, a 6th generation (6G) communication system.
In a process of discussing how to maintain context information of a terminal by using a network side method in the embodiments of the present application, the following technical solutions are considered:
A source node sends a candidate cell list and a CHO execution condition to a target node by using an SN status transfer message or a new message, and then the target node sends the information back to the source node by using a handover report message.
An occasion at which the source node sends the candidate cell list and the CHO execution condition when a handover success (HO SUCCESS) message sent by the target node is received, and the source node releases the context information of the terminal after sending the information.
After obtaining an RLF report sent by the terminal, the target node sends the RLF report and CHO-related information to the source node by using Xn (for example, Handover Report, handover report) information. The source node adjusts a CHO configuration parameter and a cell according to the feedback.
In some scenes, for example, in a scene 1, the following steps may be included:
It can be learned that the foregoing solutions are only applicable to the scene 1a, because only when CHO is successfully performed, the source base station can know which base station is connected to the terminal (when the UE performs CHO successfully, that is, being handed over to the target base station, the target base station sends an HO SUCCESS message to the source base station through an Xn interface, so that the source base station can know a specific base station to which the CHO-related information is to be sent). However, when “the terminal is reestablished to the third cell (not a source cell or a CHO candidate cell)” in the scene 1b, the third cell does not send an HO SUCCESS to the source base station (because this is a reestablishment process rather than a handover process), so that the source base station cannot learn a specific base station to which the CHO-related information that currently needs to be sent. When the target base station sends an RLF report to the source base station, the source base station may have released a UE context, and therefore CHO parameter analysis cannot be performed.
In addition, in step (3) of the scene 1, if the target base station does not obtain the RLF report in a timely manner, the target base station needs to always store CHO-related information until the target base station obtains the RLF report; or the RLF report on the terminal side is not timely obtained by the target base station and is overwritten because a new RLF occurs (or is deleted after a storage time exceeds 48 hours). In this case, the target base station always stores CHO-related information, even if the corresponding RLF report is not obtained by the target base station.
With reference to the accompanying drawings, the following describes the method and the apparatus for optimizing CHO configuration information provided in the embodiments of this application by using some embodiments and application scenes thereof.
Therefore, the foregoing solution has the foregoing problems: a. Because the target network side device does not know a type of the RLF report of the terminal (for example, CHO/handover (HO)/dual active protocol stack (DAPS) handover/no RLF during handover), the RLF report cannot be obtained in time. b. In the foregoing scene 1b, the source base station cannot learn, by using the HO SUCCESS, a specific base station to which CHO-related information is sent.
Step 210: A source network side device sends CHO configuration information to a terminal.
Step 220: The source network side device receives first indication information, where the first indication information includes an RLF report.
Step 230: The source network side device optimizes CHO configuration information corresponding to the terminal according to the first indication information.
It should be noted that the method for optimizing CHO configuration information provided in this embodiment of this application may be performed by the source network side device. A cell corresponding to the source network side device may be a cell connected when the terminal receives a CHO configuration.
In step 210, the source network side device sends the CHO configuration information to the terminal.
After receiving the CHO configuration information sent by the source network side device, the terminal performs CHO according to the CHO configuration information. If the terminal encounters an RLF in a cell in a process of performing CHO (including before and after performing CHO according to the CHO configuration information), the terminal sends the RLF report to a corresponding network side device.
In step 220, the terminal may directly send the RLF report to the source network side device, or may send the RLF report to another network side device other than the source network side device.
It should be noted that if the terminal sends the RLF report to another network side device in the process of performing CHO, the another network side device finally sends the RLF report to the source network side device by using the first indication information, to ensure that the source network side device can receive the RLF report.
In step 230, the source network side device may optimize the CHO configuration information corresponding to the terminal according to the first indication information received in step 220.
According to the method for optimizing CHO configuration information provided in this embodiment of this application, a source network side device can finally successfully receive an RLF report, and can optimize CHO configuration information corresponding to a terminal based on the RLF report, to update the CHO configuration information, thereby effectively improving a success rate of updating CHO configuration information compared with the prior art.
In an embodiment, the receiving, by the source network side device, first indication information may include:
Scene 1: In a case that the terminal does not perform CHO and encounters an RLF in a first cell, the source network side device receives first indication information sent by a target network side device, where the first indication information includes a first RLF report.
For example, the terminal receives the CHO configuration information delivered by the source network side device, and encounters an RLF in the first cell before observing a cell that meets a CHO execution condition and is reestablished a specific cell or performs RLF recovery in a CHO candidate cell.
In this scene, the second cell includes the specific cell and the CHO candidate cell. The specific cell is a cell other than the first cell and the CHO candidate cell.
The first RLF report is sent when the terminal encounters an RLF in the first cell. The terminal sends the first RLF report to the target network side device when encountering an RLF in the first cell, and then the target network side device sends the first RLF report to the source network side device.
Scene 2: In a case that the terminal performs CHO to hand over from a first cell to a second cell and is reestablished to a third cell after encountering an RLF in the second cell, the source network side device receives first indication information sent by a target network side device, where the first indication information includes a second RLF report.
For example, the terminal receives a CHO configuration delivered by the source network side device, and selects the second cell that meets a CHO execution condition to successfully complete CHO. However, in a short time, the terminal encounters an RLF in the second cell and is successfully reestablished to the third cell.
The second RLF report is sent when the terminal encounters an RLF in the second cell. The terminal sends the second RLF report to the target network side device when encountering an RLF in the second cell, and then the target network side device sends the second RLF report to the source network side device.
Scene 3: In a case that the terminal performs CHO to hand over from a first cell to a second cell and is reestablished to the first cell after encountering an RLF in the second cell, the source network side device receives first indication information sent by the terminal, where the first indication information includes a second RLF report.
For example, the terminal receives a CHO configuration delivered by the source network side, and selects the second cell that meets a CHO execution condition to successfully complete CHO. However, in a short time, the terminal encounters an RLF in the second cell and is successfully reestablished to the first cell.
The first cell is a cell corresponding to the source network side device, the second cell is a cell corresponding to the target network side device, and the third cell is a cell corresponding to a third network side device.
The third network side device is a network side device that is different from the source network side device and the target network side device.
According to the method for optimizing CHO configuration information provided in this embodiment of this application, the first indication information can be received by the source network side device in different scenes, thereby ensuring a success rate of updating CHO configuration information.
It should be noted that, for a CHO scene in a minimization of drive tests (MDT)/self-organizing network (SON), it may be specified that the terminal needs to report some related information to a network side device, so that the network side device can analyze whether a parameter of a configured CHO execution condition and a configured CHO candidate cell list are reasonable. The network side device may optimize these parameters, thereby improving a success probability of handover of the terminal.
Although the introduction of the MDT/SON can help the network to perform performance optimization, power consumption/storage of the terminal is also affected. Therefore, when the CHO scene in the standardized MDT/SON is optimized, impact on the terminal needs to be avoided as much as possible, that is, information that needs to be reported by the terminal to the network side needs to be reduced as much as possible. Information such as a CHO execution condition and a CHO candidate cell are stored in a terminal context (UE context) of a base station at present. Therefore, this part of information is known in advance to the network side device, that is, the terminal does not need to report this part of information when the terminal context is stored in the network side device.
However, the terminal context is not always reserved by the base station. According to a procedure of legacy (later), after the terminal encounters an RLF in a current serving cell, or after the terminal is successfully handed over to a target cell, the network side device reserves the terminal context for a period of time based on implementation, that is, a base station whose protocol is not standardized needs to forcibly reserve the terminal context in the foregoing case. A time for reserving the terminal context by the base station also depends on implementation of the base station.
Therefore, in a case that the network side device cannot always reserve the terminal context, a solution of how the network side device processes the terminal context needs to be provided.
In an embodiment, before the receiving, by the source network side device, first indication information, the method further includes:
For example, when the terminal encounters an RLF in the first cell and is handed over to the second cell (a cell in the CHO candidate cell list) (that is, a scene 1), the terminal sends the RLF report to the target network side device (a network side device corresponding to the second cell), and the target network side device sends the first notification message, for example, an Xn message such as an HO SUCCESS message, to the source network side device, to instruct the source network side device to send the CHO-related information to a specific network side device.
For example, when the terminal is handed over from the first cell to the second cell, and encounters an RLF in the second cell and is reestablished to the third cell (a cell other than a source cell and a CHO candidate cell) (that is, a scene 2), the terminal sends the RLF report to the target network side device (a network side device corresponding to the third cell), and the target network side device determines an identifier (ID) of the source network side device according to information about a network side device corresponding to the first cell that is connected to the terminal when an RLC occurs in the RLF report, to send the first notification message, for example, an Xn message such as a failure indication message, to the source network side device according to the ID, to instruct the source network side device to send the CHO-related information to a specific network side device.
Optionally, the sending, by the source network side device, CHO-related information to the target network side device according to the first notification message may include:
The ID of the target network side device in the first notification message is identified, so that the source network side device can quickly and efficiently determine a specific network side device to which the CHO-related information needs to be sent.
It should be noted that when the terminal is handed over to the second cell, the target network side device (a network side device corresponding to the second cell) sends an HO SUCCESS message to the source network side device due to the handover process. When the terminal is reestablished to the third cell, because no handover process occurs, the target network side device (a network side device corresponding to the third cell) cannot notify the source network side device by using the HO SUCCESS message. Therefore, in this case, the source network side device cannot determine a specific network side device to which the CHO-related information needs to be sent.
However, the first notification message sent by the target network side device (a network side device corresponding to the third cell) is received when the terminal encounters an RLF in the first cell and is reestablished to the third cell. The source network side device may determine, according to the first notification message, a specific network side device to which the CHO-related information needs to be sent, to ensure that CHO configuration information is updated, thereby improving a success rate of updating CHO configuration information.
In an embodiment, the first indication information further includes at least one of the following:
It should be noted that when the source network side device receives the RLF report, if the CHO-related information is locally stored, the source network side device directly optimizes the CHO configuration information corresponding to the terminal in the CHO-related information according to the RLF report.
In a case that the source network side device sends the CHO-related information to the target network side device, to optimize the CHO configuration information, the source network side device needs to receive the RLF report from the target network side device and at least one of the following:
For example, the target network side device may send the RLF report and at least one of the foregoing information to the source network side device by using the first indication information, for example, an Xn message such as a handover report.
After receiving the first indication information sent by the target network side device, the source network side device may optimize the CHO configuration information corresponding to the terminal according to the first indication information.
According to the method for optimizing CHO configuration information provided in this embodiment of this application, in a case that a source network side device sends CHO-related information to a target network side device, first indication information that includes an RLF report and the CHO-related information and that is returned by the target network side device is received, to ensure that CHO configuration information can still be updated in this case, thereby improving a success rate of updating CHO configuration information.
The first indication information is used to instruct the source network side device to optimize CHO configuration information corresponding to the terminal.
It should be noted that the method for processing CHO configuration information provided in this embodiment of this application may be performed by the target network side device. A cell corresponding to the target network side device may be any one of the following:
In step 310, the target network side device may receive the RRC message sent by the terminal, where the RRC message is used to instruct the target network side device to obtain the RLF report.
In step 320, the target network side device may obtain the RLF report according to the RRC message.
The RRC message may include at least one of RLF indication information or an RLF report.
When the RRC message includes the RLF indication information, the target network side device needs to initiate a process of obtaining the RLF report, to obtain the RLF report as soon as possible.
When the RRC message includes the RLF report, the target network side device may directly obtain the RLF report.
After the RLF report is obtained, the target network side device may send the first indication information to the source network side device in step 330.
The first indication information is used to instruct the source network side device to optimize the CHO configuration information corresponding to the terminal, and includes the RLF report.
According to the method for processing CHO configuration information provided in this embodiment of this application, after obtaining an RLF report, a target network side device sends first indication information to a source network side device to instruct the source network side device to optimize CHO configuration information corresponding to a terminal, to ensure that the terminal can obtain updated CHO configuration information when encountering an RLF in a CHO process, thereby effectively improving a success rate of updating CHO configuration information compared with the prior art.
In an embodiment, the RRC message includes at least one of RLF indication information or an RLF report; and
Optionally, when the RRC message directly carries the RLF report, the target network side device may directly obtain the RLF report from the RRC message sent by the terminal instead of sending any request information to the terminal, thereby reducing a quantity of times of interaction and improving efficiency of obtaining the RLF report.
When the RRC message includes the RLF indication information, the RLF indication information may be implemented by a first indication field. When the first indication field is present, it may indicate that the RLF report is related to CHO. When the first indication field is not present, it indicates that the RLF report is not related to CHO. For example, in this case, the RLF report may be related to DAPS handover, HO, a common RLF, or the like.
Optionally, when the RRC message sent by the terminal to the target network side device carries the first indication field, and the first indication field indicates that the current RLF report is an event related to CHO, the target network side device needs to initiate, as early as possible, a procedure of obtaining the RLF report to the terminal, that is, perform a request by using second indication information. The second indication information may be, for example, a UE information request (UEInformationRequest) message.
It should be noted that, to enable the source network side device to minimize time for maintaining the terminal context, the target network side device needs to obtain the RLF report related to CHO as soon as possible.
If the target network side device does not obtain the RLF report as soon as possible (for example, overload occurs in a radio access network), it indicates that the network does not care about the RLF report, and CHO information corresponding to the RLF report may be released due to a timeout by the source network side device.
Therefore, in the method for processing CHO configuration information provided in this embodiment of this application, in a case that the RRC message includes the RLF indication information, the target network side device immediately initiates the procedure of obtaining the RLF report, so that the RLF report can be obtained as soon as possible, thereby avoiding that the CHO information is released due to a timeout, thereby ensuring a smooth update of CHO configuration information.
In an embodiment, that the RLF report is related to CHO may include at least one of the following:
It should be noted that after the terminal performs CHO, the RLF report includes the CHO-related parameter. In a case that CHO is not performed, the RLF report does not include the CHO-related parameter. However, if the RLF report is generated after the source network side device configures CHO of the terminal, the RLF report is still considered to be related to CHO.
In an embodiment, step 330 may include:
It should be noted that when the source network side device locally stores the CHO-related information, the target network side device only needs to send the RLF report to the source network side device, so that the source network side device optimizes the CHO configuration information corresponding to the terminal according to the RLF report and the CHO-related information.
In an embodiment, after the step of obtaining, by the target network side device, an RLF report according to the RRC message, the method for processing CHO configuration information provided in this embodiment of this application may further include:
For example, when the terminal encounters an RLF in the first cell and is handed over to the second cell (a cell in the CHO candidate cell list) (that is, a scene 1), the terminal sends the RLF report to the target network side device (a network side device corresponding to the second cell), and the target network side device sends the first notification message, for example, an Xn message such as an HO SUCCESS message, to the source network side device, to instruct the source network side device to send the CHO-related information to a specific network side device.
After determining that the source network side device needs to send the CHO-related information to the target network side device, the source network side device sends the CHO-related information to the target network side device. After receiving the CHO-related information, the target network side device temporarily stores the CHO-related information.
For example, when the terminal is handed over from the first cell to the second cell, and encounters an RLF in the second cell and is reestablished to the third cell (a cell other than a source cell and a CHO candidate cell) (that is, a scene 2), the terminal sends the RLF report to the target network side device (a network side device corresponding to the third cell), and the target network side device determines an ID of the source network side device according to information about a network side device corresponding to the first cell that is connected to the terminal when an RLC occurs in the RLF report, to send the first notification message, for example, an Xn message such as a failure indication message, to the source network side device according to the ID, to instruct the source network side device to send the CHO-related information to a specific network side device.
After determining that the source network side device needs to send the CHO-related information to the target network side device, the source network side device sends the CHO-related information to the target network side device. After receiving the CHO-related information, the target network side device temporarily stores the CHO-related information.
It should be noted that when the terminal is handed over to the second cell, the target network side device sends an HO SUCCESS message to the source network side device due to the handover process. When the terminal is reestablished to the third cell, because no handover process occurs, the target network side device cannot notify the source network side device by using the HO SUCCESS message. Therefore, in this case, the source network side device cannot determine a specific network side device to which the CHO-related information needs to be sent.
However, the target network side device (a network side device corresponding to the third cell) sends the first notification message to the source network side device when the terminal encounters an RLF in the first cell and is reestablished to the third cell (that is, the scene 1), so that the source network side device determines, according to the first notification message, a specific network side device to which the CHO-related information needs to be sent, thereby ensuring a success rate of updating CHO configuration information.
In an embodiment, the sending, by the target network side device, first indication information to a source network side device may include:
It should be noted that in a case that the source network side device sends the CHO-related information to the target network side device, to optimize the CHO configuration information, the source network side device needs to receive the RLF report from the target network side device and at least one of the following:
For example, the target network side device may send the RLF report and at least one of the foregoing information to the source network side device by using the first indication information, for example, an Xn message such as a handover report.
After receiving the first indication information sent by the target network side device, the source network side device may optimize the CHO configuration information corresponding to the terminal according to the first indication information.
According to the method for processing CHO configuration information provided in this embodiment of this application, in a case that a source network side device sends CHO-related information to a target network side device, the target network side device returns first indication information that includes an RLF report and the CHO-related information to the source network side device, to ensure that CHO configuration information can still be updated in this case, thereby improving a success rate of updating CHO configuration information.
In an embodiment, the first indication information may be any one of the following:
Step 410: A terminal receives CHO configuration information sent by a source network side device.
Step 420: The terminal sends an RRC message to a target network side device when the terminal encounters an RLF.
The RRC message includes at least one of RLF indication information or an RLF report, and the RLF indication information and the RLF report are used to instruct to optimize CHO configuration information.
It should be noted that the method for triggering optimization of CHO configuration information provided in this embodiment of this application may be performed by the terminal, such as a mobile phone or a computer.
In step 410, after receiving the CHO configuration information sent by the source network side device, the terminal performs a CHO operation according to the CHO configuration information.
In step 420, when the terminal encounters an RLF in a process of performing CHO, the terminal sends the RRC message to the target network side device, where the RRC includes at least one of the RLF indication information or the RLF report.
Optionally, when the RRC message directly carries the RLF report, the target network side device may directly obtain the RLF report from the RRC message sent by the terminal instead of sending any request information to the terminal, thereby reducing a quantity of times of interaction and improving efficiency of obtaining the RLF report.
When the RRC message includes the RLF indication information, the RLF indication information may be implemented by a first indication field. When the first indication field is present, it may indicate that the RLF report is related to CHO. When the first indication field is not present, it indicates that the RLF report is not related to CHO. For example, in this case, the RLF report may be related to DAPS handover, HO, a common RLF, or the like.
Optionally, when the RRC message sent by the terminal to the target network side device carries the first indication field, and the first indication field indicates that the current RLF report is an event related to CHO, the target network side device needs to initiate, as early as possible, a procedure of obtaining the RLF report to the terminal, that is, perform a request by using second indication information. The second indication information may be, for example, a UEInformationRequest message.
It should be noted that, to enable the source network side device to minimize time for maintaining the terminal context, the target network side device needs to obtain the RLF report related to CHO as soon as possible.
If the target network side device does not obtain the RLF report as soon as possible (for example, overload occurs in a radio access network), it indicates that the network does not care about the RLF report, and CHO information corresponding to the RLF report may be released due to a timeout by the source network side device.
Therefore, in the method for triggering optimization of CHO configuration information provided in this embodiment of this application, in a case that the RRC message includes the RLF indication information, the target network side device immediately initiates the procedure of obtaining the RLF report, so that the RLF report can be obtained as soon as possible, thereby avoiding that the CHO information is released due to a timeout, thereby ensuring a smooth update of CHO configuration information.
After the target network side device obtains the RLF report by using the RRC message sent by the terminal, the source network side device is triggered to optimize the CHO configuration information.
According to the method for triggering optimization of CHO configuration information provided in this embodiment of this application, after an RLF report is obtained, a source network side device is triggered to optimize CHO configuration information corresponding to a terminal, to ensure that the terminal can obtain updated CHO configuration information when encountering an RLF in a CHO process, thereby effectively improving a success rate of updating CHO configuration information compared with the prior art.
In an embodiment, step 420 may include:
Scene 1: The terminal sends the RRC message to the target network side device in a case that the terminal encounters an RLF in a first cell before performing CHO and is reestablished to a second cell or performs RLF recovery in a third cell.
For example, the terminal receives the CHO configuration information delivered by the source network side device, and encounters an RLF in the first cell before observing a cell that meets a CHO execution condition and is reestablished a specific cell or performs RLF recovery in a CHO candidate cell.
In this scene, the second cell includes the specific cell and the CHO candidate cell. The specific cell is a cell other than the first cell and the CHO candidate cell.
In this scene, the RRC message includes a first RLF report, and the first RLF report is generated when the terminal encounters an RLF in the first cell. When encountering an RLF in the first cell, the terminal sends the first RLF report to the target network side device by using the RRC message, and then the target network side device sends the first RLF report to the source network side device.
Scene 2: The terminal sends the RRC message to the target network side device in a case that the terminal performs CHO to hand over from a first cell to a second cell and is reestablished to a third cell after encountering an RLF in the second cell.
For example, the terminal receives a CHO configuration delivered by the source network side device, and selects the second cell that meets a CHO execution condition to successfully complete CHO. However, in a short time, the terminal encounters an RLF in the second cell and is successfully reestablished to the third cell.
A second RLF report is generated when the terminal encounters an RLF in the second cell. When encountering an RLF in the second cell, the terminal sends the second RLF report to the target network side device by using the RRC message, and then the target network side device sends the second RLF report to the source network side device.
Scene 3: The terminal sends the RRC message to the source network side device in a case that the terminal performs CHO to hand over from a first cell to a second cell and is reestablished to the first cell after encountering an RLF in the second cell.
For example, the terminal receives a CHO configuration delivered by the source network side, and selects the second cell that meets a CHO execution condition to successfully complete CHO. However, in a short time, the terminal encounters an RLF in the second cell and is successfully reestablished to the first cell.
The first cell is a cell corresponding to the source network side device, the second cell is a cell corresponding to the target network side device, and the third cell is a cell corresponding to a third network side device.
According to the method for triggering optimization of CHO configuration information provided in this embodiment of this application, it is ensured that the source network side device can be triggered to optimize the CHO configuration information in different scenes, thereby ensuring a success rate of updating CHO configuration information.
In an embodiment, when the RRC message includes the RLF indication information, the RLF indication information indicates that the RLF is related to CHO.
In an embodiment, that the RLF report is related to CHO may include at least one of the following:
It should be noted that after the terminal performs CHO, the RLF report includes the CHO-related parameter. In a case that CHO is not performed, the RLF report does not include the CHO-related parameter, but the RLF report is generated only after the source network side device configures CHO of the terminal. Therefore, in this case, the RLF report is still considered to be related to CHO.
In an embodiment, the RRC message may include at least one of the following:
In an embodiment, the first indication field included in the RRC message may be implemented by using the following solutions:
Solution (1): Extend an RRCSetupComplete message, and introduce RRCSetupComplete-v1710-IEs to include the first indication field r1f-CHO-r17.
Solution (2): Extend UE-MeasurementsAvailable to include the first indication field r1f-CHO-r17.
In the solutions (1) and (2):
When r1f-CHO-r17 exists, it indicates that a CHO-related RLF event exists on the terminal side.
Optionally, there is a coupling relationship between r1f-CHO-r17 and r1f-InfoAvailable-r16 in UE-MeasurementsAvailable. That is, the terminal needs to set whether r1f-InfoAvailable-r16 exists before setting whether r1f-CHO-r17 exists; and when the terminal sets that r1f-InfoAvailable-r16 does not exist, r1f-CHO-r17 cannot be included.
Optionally, there is an exclusive relationship between r1f-CHO-r17 and r1f-InfoAvailable-r16 in UE-MeasurementsAvailable. That is, when r1f-InfoAvailable-r16 exists, it indicates that there is a CHO-independent RLF report on the terminal side, and when r1f-CHO-r17 exists, it indicates that there is a CHO-related RLF event on the terminal side. The terminal can set that only one of r1f-CHO-r17 and r1f-InfoAvailable-r16 fields exists.
To facilitate understanding of the technical solutions provided in the embodiments of this application, the following examples are provided:
Example 1: A source network side device mainly maintains CHO-related information:
Step 1: A source network side device delivers CHO configuration information to a terminal.
Step 2: The terminal sends an RRC message to a target network side device when the terminal encounters an RLF in a first cell and is reestablished to a third cell, where the RRC message carries a first indication field, indicating that a CHO-related RLF report currently exists on the terminal side.
Step 3: The target network side device receives the first indication field, immediately sends a UEInformationRequest message to the terminal, and requests the terminal to send the RLF report.
Step 4: The terminal receives an RLF report request indication in the UEInformationRequest, adds the RLF report to UEInformationResponse, and sends the RLF report to the target network side device.
Step 5: The target network side device sends the RLF report to the source network side device by using an Xn message Failure Indication.
Step 6: After receiving the message that carries the RLF report, the source network side device optimizes the CHO configuration information with reference to local CHO-related information.
Example 2: A target network side device mainly maintains CHO-related information, where the target network side device is a network side device corresponding to a CHO candidate cell.
Step 1: A source network side device delivers CHO configuration information to a terminal.
Step 2: The terminal sends an RRC message to a target network side device when the terminal encounters an RLF in a first cell and recovers to a second cell (a CHO candidate cell), where the RRC message carries a first indication field, indicating that a CHO-related RLF report currently exists on the terminal side.
Step 3: After receiving the first indication field, the target network side device:
Step 4: The terminal receives an RLF report request indication in UEInformationRequest, adds the RLF report to UEInformationResponse, and sends UEInformationResponse to the target network side device. After receiving HO SUCCESS, the source network side device sends CHO-related information to the target network side device.
Step 5: The target network side device sends the RLF report and the received CHO-related information to the source network side device by using an Xn message such as a handover report.
Step 6: After receiving the handover report, the source network side device optimizes the CHO configuration information.
Example 3: A target network side device mainly maintains CHO-related information, where the target network side device is a network side device corresponding to a third cell.
Step 1: A source network side device delivers CHO configuration information to a terminal.
Step 2: The terminal sends an RRC message to a target network side device when the terminal encounters an RLF in a first cell and is reestablished to a third cell, where the RRC message carries a first indication field, indicating that a CHO-related RLF report currently exists on the terminal side.
Step 3: After receiving the first indication field, the target network side device immediately sends a UEInformationRequest message to the terminal to request the terminal to send the RLF report.
Step 4: The terminal receives an RLF report request indication in UEInformationRequest, adds the RLF report to UEInformationResponse, and sends UEInformationResponse to the target network side device.
Step 5: The target network side device generates an Xn message such as a failure indication to the source network side device (that is, a network side device indicated by a cell ID) according to an ID of a cell connected to the terminal when an RLF occurs.
Step 6: After receiving the failure indication, the source network side device sends CHO-related information to the target network side device.
Step 7: The target network side device sends the RLF report and the received CHO-related information to the source network side device by using an Xn message such as a handover report.
Step 8: After receiving the handover report, the source network side device optimizes the CHO configuration information.
It should be noted that, the method for optimizing CHO configuration information provided in the embodiments of this application may be performed by an apparatus for optimizing CHO configuration information, or a control module that is in the apparatus for optimizing CHO configuration information and that is configured to perform the method for optimizing CHO configuration information. In the embodiments of this application, an example in which the apparatus for optimizing CHO configuration information performs the method for optimizing CHO configuration information is used to describe the apparatus for optimizing CHO configuration information provided in the embodiments of this application.
According to the apparatus for optimizing CHO configuration information provided in this embodiment of this application, a source network side device can finally successfully receive an RLF report, and can optimize CHO configuration information corresponding to a terminal based on the RLF report, to update the CHO configuration information, thereby effectively improving a success rate of updating CHO configuration information compared with the prior art.
In an embodiment, the receiving module 520 is configured to:
In an embodiment, before receiving the first indication information, the receiving module 520 is further configured to:
In an embodiment, the receiving module 520 is configured to:
In an embodiment, the first notification message is a handover success HO SUCCESS message; or
In an embodiment, the first indication information further includes at least one of the following:
The apparatus for optimizing CHO configuration information in this embodiment of this application may be an electronic device, or may be a component in the electronic device, such as an integrated circuit or a chip. The electronic device may be a terminal, or may be a device other than the terminal. For example, the mobile electronic device may be a mobile phone, a tablet computer, a laptop computer, a palmtop computer, an in-vehicle electronic terminal, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA). The non-mobile electronic device may be a server, a network attached storage (NAS), a personal computer (PC), a television (TV), an automated teller machine, or a self-service machine. This is not specifically limited in this embodiment of this application.
The apparatus for optimizing CHO configuration information in this embodiment of this application may be an apparatus with an operating system. The operating system may be an Android operating system, an iOS operating system, or another possible operating system. This is not specifically limited in this embodiment of this application.
The apparatus for optimizing CHO configuration information provided in this embodiment of this application can implement the processes implemented in the method embodiment in
It should be noted that, the method for processing CHO configuration information provided in the embodiments of this application may be performed by an apparatus for processing CHO configuration information, or a control module that is in the apparatus for processing CHO configuration information and that is configured to perform the method for processing CHO configuration information. In the embodiments of this application, an example in which the apparatus for processing CHO configuration information performs the method for processing CHO configuration information is used to describe the apparatus for processing CHO configuration information provided in the embodiments of this application.
According to the apparatus for processing CHO configuration information provided in this embodiment of this application, after obtaining an RLF report, a target network side device sends first indication information to a source network side device to instruct the source network side device to optimize CHO configuration information corresponding to a terminal, to ensure that the terminal can obtain updated CHO configuration information when encountering an RLF in a CHO process, thereby effectively improving a success rate of updating CHO configuration information compared with the prior art.
In an embodiment, the RRC message includes at least one of RLF indication information or the RLF report; and
In an embodiment, that the RLF report is related to CHO includes at least one of the following:
In an embodiment, the sending module 630 is configured to:
In an embodiment, the sending module 630 is further configured to:
In an embodiment, the sending module 630 is configured to:
In an embodiment, the first indication information is any one of the following:
The apparatus for processing CHO configuration information in this embodiment of this application may be an electronic device, or may be a component in the electronic device, such as an integrated circuit or a chip. The electronic device may be a terminal, or may be a device other than the terminal. For example, the mobile electronic device may be a mobile phone, a tablet computer, a laptop computer, a palmtop computer, an in-vehicle electronic terminal, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA). The non-mobile electronic device may be a server, a network attached storage (NAS), a personal computer (PC), a television (TV), an automated teller machine, or a self-service machine. This is not specifically limited in this embodiment of this application.
The apparatus for processing CHO configuration information in this embodiment of this application may be an apparatus with an operating system. The operating system may be an Android operating system, an iOS operating system, or another possible operating system. This is not specifically limited in this embodiment of this application.
The apparatus for processing CHO configuration information provided in this embodiment of this application can implement the processes implemented in the method embodiment in
It should be noted that, the method for triggering optimization of CHO configuration information provided in the embodiments of this application may be performed by an apparatus for triggering optimization of CHO configuration information, or a control module that is in the apparatus for triggering optimization of CHO configuration information and that is configured to perform the method for triggering optimization of CHO configuration information. In the embodiments of this application, an example in which the apparatus for triggering optimization of CHO configuration information performs the method for triggering optimization of CHO configuration information is used to describe the apparatus for triggering optimization of CHO configuration information provided in the embodiments of this application.
According to the apparatus for triggering optimization of CHO configuration information provided in this embodiment of this application, after an RLF report is obtained, a source network side device is triggered to optimize CHO configuration information corresponding to a terminal, to ensure that the terminal can obtain updated CHO configuration information when encountering an RLF in a CHO process, thereby effectively improving a success rate of updating CHO configuration information compared with the prior art.
In an embodiment, the sending module 720 is configured to:
In an embodiment, in a case that the RRC message includes RLF indication information, the RLF indication information indicates that the RLF is related to CHO.
In an embodiment, that the RLF report is related to CHO includes at least one of the following:
In an embodiment, the RRC message includes at least one of the following:
The apparatus for triggering optimization of CHO configuration information in this embodiment of this application may be an electronic device, or may be a component in the electronic device, such as an integrated circuit or a chip. The electronic device may be a terminal, or may be a device other than the terminal. For example, the mobile electronic device may be a mobile phone, a tablet computer, a laptop computer, a palmtop computer, an in-vehicle electronic terminal, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA). The non-mobile electronic device may be a server, a network attached storage (NAS), a personal computer (PC), a television (TV), an automated teller machine, or a self-service machine. This is not specifically limited in this embodiment of this application.
The apparatus for triggering optimization of CHO configuration information in this embodiment of this application may be an apparatus with an operating system. The operating system may be an Android operating system, an iOS operating system, or another possible operating system. This is not specifically limited in this embodiment of this application.
The apparatus for triggering optimization of CHO configuration information provided in this embodiment of this application can implement the processes implemented in the method embodiment in
Optionally, as shown in
An embodiment of this application further provides a terminal, including a processor and a communication interface. The communication interface is configured to: receive conditional handover CHO configuration information sent by a source network side device; and send a radio resource control RRC message to a target network side device when the terminal encounters a radio link failure RLF. This terminal embodiment corresponds to the foregoing method embodiment on the terminal side. Each implementation process and implementation of the foregoing method embodiment may be applicable to this terminal embodiment, and a same technical effect can be achieved. Optionally,
The terminal 900 includes but is not limited to at least a part of components such as a radio frequency unit 901, a network module 902, an audio output unit 903, an input unit 904, a sensor 905, a display unit 906, a user input unit 907, an interface unit 908, a memory 909, and a processor 910.
A person skilled in the art can understand that the terminal 900 may further include a power supply (such as a battery) that supplies power to each component. The power supply may be logically connected to the processor 910 by using a power supply management system, to implement functions such as charging and discharging management, and power consumption management by using the power supply management system. The terminal structure shown in
It should be understood that, in this embodiment of this application, the input unit 904 may include a graphics processing unit (GPU) 9041 and a microphone 9042, and the graphics processing unit 9041 processes image data of a still picture or a video obtained by an image capture apparatus (such as a camera) in a video capture mode or an image capture mode. The display unit 906 may include a display panel 9061. Optionally, the display panel 9061 may be configured in a form such as a liquid crystal display or an organic light-emitting diode. The user input unit 907 includes a touch panel 9071 and another input device 9072. The touch panel 9071 is also referred to as a touchscreen. The touch panel 9071 may include two parts: a touch detection apparatus and a touch controller. The another input device 9072 may include but is not limited to a physical keyboard, a functional button (such as a volume control button or a power on/off button), a trackball, a mouse, and a joystick. Details are not described herein.
In this embodiment of this application, the radio frequency unit 901 receives downlink data from a network side device and then sends the downlink data to the processor 910 for processing; and sends uplink data to the network side device. Usually, the radio frequency unit 901 includes but is not limited to an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like.
The memory 909 may be configured to store a software program and various data. The memory 909 may mainly include a first storage area for storing a program or an instruction and a second storage area for storing data. The first storage area may store an operating system, and an application or an instruction required by at least one function (for example, a sound playing function or an image playing function). In addition, the memory 909 may include a volatile memory or a non-volatile memory, or the memory 909 may include both a volatile memory and a non-volatile memory. The nonvolatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDR SDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a synchlink dynamic random access memory (SLDRAM), and a direct rambus random access memory (DR RAM). The memory 909 in this embodiment of this application includes but is not limited to these memories and any memory of another proper type.
The processor 910 may include one or more processing units. Optionally, an application processor and a modem processor are integrated into the processor 910. The application processor mainly processes an operating system, a user interface, an application, or the like. The modem processor mainly processes a wireless communication signal, for example, a baseband processor. It can be understood that, alternatively, the modem processor may not be integrated into the processor 910.
The radio frequency unit 901 is configured to: receive conditional handover CHO configuration information sent by a source network side device; and send a radio resource control RRC message to a target network side device when the terminal encounters a radio link failure RLF, where the RRC message includes at least one of RLF indication information or an RLF report, and the RLF indication information and the RLF report are used to instruct to optimize CHO configuration information.
According to the terminal provided in this embodiment of this application, after an RLF report is obtained, a source network side device is triggered to optimize CHO configuration information corresponding to a terminal, to ensure that the terminal can obtain updated CHO configuration information when encountering an RLF in a CHO process, thereby effectively improving a success rate of updating CHO configuration information compared with the prior art.
Optionally, the radio frequency unit 101 is configured to:
An embodiment of this application further provides a network side device, including a processor and a communication interface. The communication interface is configured to: send conditional handover CHO configuration information to a terminal; and receive first indication information, where the first indication information includes a radio link failure RLF report; and the processor is configured to optimize CHO configuration information corresponding to the terminal according to the first indication information; or
This network side device embodiment corresponds to the foregoing method embodiment on the network side. Each implementation process and implementation of the foregoing method embodiment on the network side may be applicable to this network side device embodiment, and a same technical effect can be achieved.
Optionally, an embodiment of this application further provides a network side device. As shown in
The frequency band processing apparatus may be located in the baseband apparatus 103. The method performed by the network side device in the foregoing embodiment may be implemented in the baseband apparatus 103. The baseband apparatus 103 includes a processor 104 and a memory 105.
The baseband apparatus 103 may include, for example, at least one baseband board, where a plurality of chips are disposed on the baseband board. As shown in
The baseband apparatus 103 may further include a network interface 106, configured to exchange information with the radio frequency apparatus 102. For example, the interface is a common public radio interface (CPRI).
Optionally, the network side device in this embodiment of the present application further includes an instruction or a program stored in the memory 105 and executable on the processor 104. The processor 104 invokes the instruction or the program in the memory 105 to perform the method performed by the modules shown in
An embodiment of this application further provides a non-transitory readable storage medium. The non-transitory readable storage medium stores a program or an instruction, and when the program or the instruction is executed by a processor, the processes of the foregoing method embodiment are implemented and a same technical effect can be achieved. To avoid repetition, details are not described herein again.
The processor is a processor in the terminal in the foregoing embodiment. The non-transitory readable storage medium includes a non-transitory computer-readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disc.
An embodiment of this application further provides a chip. The chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to run a program or an instruction to implement the processes of the foregoing method embodiment, and a same technical effect can be achieved. To avoid repetition, details are not described herein again.
It should be understood that the chip mentioned in this embodiment of this application may also be referred to as a system-level chip, a system chip, a chip system, or an on-chip system chip.
It should be noted that, in this specification, the terms “include”, “comprise”, or their any other variant is intended to cover a non-exclusive inclusion, so that a process, a method, an article, or an apparatus that includes a list of elements not only includes those elements but also includes other elements which are not expressly listed, or further includes elements inherent to such process, method, article, or apparatus. An element limited by “including a . . . ” does not, without more constraints, preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element. In addition, it should be noted that the scope of the method and the apparatus in the embodiments of this application is not limited to performing functions in an illustrated or discussed sequence, and may further include performing functions in a basically simultaneous manner or in a reverse sequence according to the functions concerned. For example, the described method may be performed in an order different from that described, and the steps may be added, omitted, or combined. In addition, features described with reference to some examples may be combined in other examples.
Based on the descriptions of the foregoing implementations, a person skilled in the art may clearly understand that the method in the foregoing embodiment may be implemented by software in addition to a necessary universal hardware platform or by hardware only. In most circumstances, the former is a preferred implementation. Based on such an understanding, the technical solutions of this application essentially or the part contributing to the prior art may be implemented in a form of a computer software product. The computer software product is stored in a non-transitory storage medium (such as a ROM/RAM, a hard disk, or an optical disc), and includes several instructions for instructing a terminal (which may be mobile phone, a computer, a server, a network device, or the like) to perform the methods described in the embodiments of this application.
The embodiments of this application are described above with reference to the accompanying drawings, but this application is not limited to the above implementations, and the above implementations are only illustrative and not restrictive. Under the enlightenment of this application, those of ordinary skill in the art can make many forms without departing from the purpose of this application and the protection scope of the claims, all of which fall within the protection of this application.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202110768494.8 | Jul 2021 | CN | national |
This application is a Bypass Continuation Application of International Patent Application No. PCT/CN2022/103291, filed Jul. 1, 2022, and claims priority to Chinese Patent Application No. 202110768494.8, filed Jul. 7, 2021, the disclosures of which are hereby incorporated by reference in their entireties.
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/CN2022/103291 | Jul 2022 | US |
| Child | 18404115 | US |
