CN110611944A

CN110611944A - Method and equipment for reselecting Relay UE

Info

Publication number: CN110611944A
Application number: CN201810622826.XA
Authority: CN
Inventors: 马路娟; 刘宏举; 张传欣; 刘强; 刘敏; 吕叶青
Original assignee: Hisense Group Co Ltd
Current assignee: Hisense Group Co Ltd
Priority date: 2018-06-15
Filing date: 2018-06-15
Publication date: 2019-12-24

Abstract

The invention discloses a method and equipment for reselecting Relay UE (user equipment), which are used for solving the problem of unstable connection between the Relay UE and the Relay UE in the prior art. In the embodiment of the invention, after receiving a Relay reselection request aiming at Remote UE sent by a base station of the UE, the UE judges whether to be the Relay UE of the Remote UE according to the performance information of the UE; and the UE informs the base station of the judgment result. Therefore, before the UE receives the Remote UE, the UE can determine whether the UE is the Relay UE of the Remote UE according to the performance information of the UE, thereby avoiding frequent switching of the Relay UE of the Remote UE caused by insufficient performance of the UE and improving the communication stability between the Remote UE and the UE.

Description

Method and equipment for reselecting Relay UE

Technical Field

The present invention relates to the field of internet of things, and in particular, to a method and a device for reselecting Relay User Equipment (Relay terminal).

Background

The internet of things is an internet connected with objects, the basis of the internet of things is still the internet, and the internet of things is an extended and expanded network on the basis of the internet, and a user side of the internet of things can be extended and expanded to any object to carry out information exchange and communication between the objects.

Among various terminals of the internet of things, some terminals (Remote UEs) may establish a D2D communication link with another Relay UE, and connect with a base station via the Relay UE to complete data transmission.

Generally, when a Relay UE selects a Relay UE only depending on channel quality, the Relay UE selects a target Relay UE and accesses the selected Relay UE, and may be limited by some factors of the Relay UE itself.

In summary, in the prior art, the Remote UE is not stable enough when transmitting data through the reselected Relay UE.

Disclosure of Invention

The invention provides a method and equipment for reselecting Relay UE (user equipment), which are used for solving the problem that the Remote UE is not stable enough when data is transmitted through the reselected Relay UE in the prior art.

In a first aspect, an embodiment of the present invention provides a method for reselecting a Relay UE, where the method includes:

the method comprises the steps that UE receives a Relay reselection request aiming at Relay UE, wherein the Relay reselection request is sent by the Relay UE or the base station after the Relay UE is determined to need to be reselected according to reselection information of the Relay UE, and the reselection information comprises performance information of source Relay UE or the performance information of the Relay UE and first channel quality between the Relay UE and the source Relay UE; the UE judges whether to be Relay UE of the Remote UE according to the performance information of the UE; and finally, the UE informs the base station of the judgment result.

After the Remote UE determines that the Relay UE needs to be reselected, a Relay reselection request is sent, and after the UE receives the Relay reselection request aiming at the Remote UE sent by a base station of the UE, whether the Relay UE is the Remote UE of the Remote UE is judged according to self load and/or performance information; and finally, the UE informs the base station of the judgment result. Therefore, before the UE receives the Remote UE, the UE can determine whether the UE is the Relay UE of the Remote UE according to the performance information of the UE, thereby avoiding frequent switching of the Relay UE of the Remote UE caused by insufficient performance of the UE and improving the communication stability between the Remote UE and the UE.

In a possible implementation manner, the UE determines whether the load of the UE is smaller than the load threshold, and if so, the UE is called Relay UE of the Remote UE; otherwise, determining Relay UE which is not the Remote UE; and/or

The UE judges whether the residual energy is larger than the residual energy threshold value or not, and if so, the UE is regarded as Relay UE of the Remote UE; otherwise, determining Relay UE which is not the Remote UE; and/or

The UE judges whether the first channel quality between the UE and the Remote UE is greater than the first channel quality threshold value, if so, the UE is used as Relay UE of the Remote UE; otherwise, determining the RelayUE which is not the Remote UE; and/or

The UE judges whether the quality of a second channel between the UE and the base station is greater than a second channel quality threshold value, if so, the UE is regarded as Relay UE of the Remote UE; otherwise, determining Relay UE which is not the Remote UE; and/or

The UE judges whether the ID of the cell to which the UE belongs is the same as the ID of the cell to which the Remote UE belongs, and if so, the UE is used as Relay UE of the Remote UE; otherwise, determining the Relay UE which is not the Remote UE. .

In the method, when the UE determines whether to serve as Relay UE of the Relay UE, the UE compares the performance information of the UE with a set threshold, and when all parameters in all the performance information of the UE meet the condition, it indicates that the UE can provide a stable data transmission service for the Relay UE, and otherwise, it determines that the UE is not suitable for serving as the Relay UE, and determines the Relay UE that is not the Relay UE. Therefore, before the Remote UE is accessed to the selected UE, the state of the UE can be detected, whether the currently selected UE has the capability of providing stable data transmission service for the Remote UE is determined, and the stability of the system is improved.

In a possible implementation manner, the UE determines the performance information threshold set by the user, and then determines whether to serve as Relay UE of the Remote UE according to the performance information of the UE.

In the method, before the UE determines whether to serve as the Relay UE of the Remote UE according to the performance information of the UE, the threshold of the corresponding performance information of the UE needs to be determined, so that whether to serve as the Relay UE of the Remote UE can be determined according to the performance information of the UE.

In a possible implementation manner, after the UE notifies the base station of the determination result, if the UE is a Relay UE of the Remote UE as the determination result, the UE establishes a PC5 connection with the Remote UE.

In the method, after the UE is judged to be Relay UE of the Remote UE, the UE and the Remote UE are connected by PC 5. Thus, a connection path between the UE and the Remote UE is established, and communication between the UE and the Remote UE is carried out through the connection path.

In a possible implementation manner, after the PC5 connection is established between the UE and the Remote UE, the UE and the Remote UE perform RRC sidelink (Radio Resource Control sidelink) connection reconfiguration, so as to establish an RRC sidelink with the Remote UE.

In the method, after the PC5 connection is established between the UE and the Remote UE, the UE and the Remote UE perform RRC sidelink connection reconfiguration, so as to establish RRC sidelink with the Remote UE. Thus, RemoteUE can communicate with the base station via the UE.

In a second aspect, an embodiment of the present invention further provides a device for reselecting a Relay UE, where the triggering device includes: at least one processing unit and at least one memory unit, the device having functionality to implement embodiments of the first aspect described above.

In a third aspect, an embodiment of the present invention further provides a device for reselecting a Relay UE, where the device includes a receiving module, a determining module, and a notifying module, and the device has functions of implementing the embodiments of the first aspect.

In addition, for technical effects brought by any one implementation manner of the second aspect to the third aspect, reference may be made to technical effects brought by different implementation manners of the first aspect, and details are not described here.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a flowchart illustrating a method for reselecting a Relay UE according to an embodiment of the present invention;

fig. 2 is a timing diagram illustrating a first method for reselecting a Relay UE according to an embodiment of the present invention;

fig. 3 is a timing diagram illustrating a second method for reselecting a Relay UE according to an embodiment of the present invention;

fig. 4 is a timing diagram illustrating a third method for reselecting a Relay UE according to an embodiment of the present invention;

fig. 5 is a timing diagram illustrating a fourth method for reselecting a Relay UE according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a first device for reselecting a Relay UE according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a second device for reselecting a Relay UE according to an embodiment of the present invention.

Detailed Description

The embodiment of the invention relates to a Remote UE, a Relay UE and a base station. Wherein, the Remote UE is connected with the base station through the Relay UE. When the base station has data to be transmitted to the Remote UE, the data information is transmitted to the Relay UE, and then the Relay UE transmits the data information to the Remote UE; when the Relay UE has data to be transmitted to the base station, the data information is transmitted to the Relay UE, and then the Relay UE transmits the data information to the base station.

In the embodiment of the invention, after the Relay UE currently connected with the Remote UE does not meet the requirement of the Remote UE any more, the Remote UE can reselect a new UE as the Relay UE of the Remote UE so as to realize data transmission between the Remote UE and the base station. Selecting a new Relay UE at the Remote UE according to the channel quality between the Remote UE and all the peripheral detected UEs capable of being used as the Relay UE, and judging whether the Remote UE is used as the Relay UE or not by the UE according to the performance information of the UE.

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, an embodiment of the present invention provides a method for reselecting a Relay UE, where the method includes:

step 100, receiving, by a UE, a Relay reselection request for a Relay UE sent by a base station of the UE, where the Relay reselection request is sent after the Relay UE or the base station determines, according to reselection information of the Relay UE, that the Relay UE needs to be reselected, and the reselection information includes performance information of a source Relay UE, or the performance information of the Relay UE and a first channel quality between the Relay UE and the source Relay UE;

step 101, the UE judges whether to be Relay UE of the Remote UE according to the performance information of the UE;

and 102, the UE informs the base station of the judgment result.

In the method, after the Remote UE determines that the Relay UE needs to be reselected, a Relay reselection request is sent, and after the UE receives the Relay reselection request aiming at the Remote UE sent by a base station, whether the UE is the Relay UE of the Remote UE is judged according to the performance information of the UE; and finally, the UE informs the base station of the judgment result. Therefore, before the UE receives the Remote UE, the UE can determine whether the UE is the Relay UE of the Remote UE according to the performance information of the UE, thereby avoiding frequent switching of the Relay UE of the Remote UE caused by insufficient performance of the UE and improving the communication stability between the Remote UE and the UE.

Wherein, the capability information of the UE includes but is not limited to some or all of the following:

the residual energy of the UE, the load of the UE, the first channel quality between the UE and the Remote UE, the second channel quality between the UE and the base station, and the ID of the cell of the UE.

The first channel quality between the UE and the Remote UE refers to sidelink channel quality between the UE and the Remote UE, and the second channel quality between the UE and the base station refers to Uulink channel quality between the UE and the base station.

Remaining energy of the UE: if the residual energy of Relay UE selected by the Remote UE is too low, the Relay UE selected by the Remote UE may quickly fail to continue to provide the Relay service due to energy exhaustion, which may cause the Relay UE of the Remote UE to perform fast handover, and thus may not stably provide the Relay service for the Remote UE.

Load of the UE: when Relay UE is selected for Remote UE, if the load of the Relay UE selected for the Remote UE is too large, a situation that the Relay UE cannot stably provide Relay service for the Remote UE due to the too large load may occur, and even network interruption may be caused.

Sidelink channel quality between UE and Remote UE: when Relay UE is selected for Remote UE, if the si-delink channel quality between Relay UE and Remote UE selected for Remote UE cannot satisfy the set condition, Relay service cannot be provided for Remote UE, that is, data transmission cannot be performed.

Uulink channel quality between UE and base station: when Relay UE is selected for the Relay UE, if the quality of the Uulink channel between the Relay UE selected for the Relay UE and the base station cannot meet the set condition, data transmission cannot be performed between the Relay UE and the base station, and Relay service cannot be provided for the Relay UE.

When the selected Relay UE and the Remote UE belong to the same cell, the selected Relay UE can more stably provide Relay service for the Remote UE.

In the embodiment of the invention, the UE judges whether to be Relay UE of the Remote UE according to the performance information of the UE.

And firstly, the UE takes a single performance parameter as a judgment basis according to the self performance information.

The following description will be given by taking the load and the remaining energy as examples.

The first embodiment is as follows: and the UE judges whether to be Relay UE of the Remote UE according to the load of the UE.

In specific implementation, optionally, the UE receives a Relay reselection request for a Relay UE sent by a base station of the UE, where the Relay reselection request is sent after the Relay UE or the base station determines that the Relay UE needs to be reselected according to reselection information of the Relay UE, and the reselection information includes performance information of a source Relay UE, or the performance information of the Relay UE and channel quality between the Relay UE and the source Relay UE.

In the method, the UE receives the Relay reselection request aiming at the Remote UE and sent by the base station, and further judges whether the UE is the Relay UE of the Remote UE.

Optionally, the UE receives a Relay reselection request for a Remote UE sent by the base station.

In the method, the UE receives the Relay reselection request aiming at the Remote UE and sent by the base station, informs the UE, and enables the UE to further judge whether to be the Relay UE of the Remote UE.

The Relay reselection request is sent after the Relay UE or the base station determines that the Relay UE needs to be reselected according to the performance information of the source Relay UE of the Relay UE and/or the first channel quality between the Relay UE and the source Relay UE.

Optionally, after determining the load threshold set by the user, the UE determines whether to serve as Relay UE of the Remote UE according to its own load.

In the method, the UE first needs to determine the threshold of the corresponding self load, and then can determine whether to serve as Relay UE of the Remote UE according to the self load, so that whether to serve as Relay UE of the Remote UE can be determined according to the self load.

For example: assuming that the user a sets the highest accessible Remote UE number of the UE1 to be 2, and when there are two Remote UEs that have access, the UE1 is not admitting any Remote UE, it may be determined that the load threshold of the UE1 is 2.

After the UE determines the load threshold set by the user, whether the UE is Relay UE of the Remote UE is judged according to the load of the UE.

Optionally, the UE determines whether the load of the UE is smaller than the load threshold, and if so, the UE is called Relay UE of the Remote UE; otherwise, determining the Relay UE which is not the Remote UE.

In the method, when the UE is judged to be Relay UE of the Remote UE, whether the load of the UE is smaller than a load threshold value is judged, and if the load of the UE is smaller than the load threshold value, the UE can be used as Relay UE of the Remote UE to provide stable service for the Remote UE; and if the load of the UE is equal to the load threshold, the UE cannot accept the access of new Remote UE, is not suitable for Relay UE serving as the Remote UE, and determines the Relay UE which is not used as the Remote UE. Therefore, before the Remote UE is accessed to the selected UE, the state of the UE can be measured, whether the currently selected UE has the capability of providing stable data transmission service for the Remote UE is determined, and the stability of the system is improved.

For example:

assuming that the user a sets the highest accessible Remote UE number of the UE1 to be 2, it may be determined that the load threshold of the UE1 is 2, and assuming that after Relay UE reselection is performed for the Remote UE, the UE1 is determined to be an alternative Relay UE with the best channel quality, and the load number of the current UE1 is 1. Then, since the number of loads currently connected to the UE1 is 1, which is smaller than the set threshold, the UE1 is regarded as Relay UE of the Remote UE.

And feeding back the obtained result to the base station when determining whether the UE is a Relay UE of the optional Remote UE.

Optionally, the UE notifies the base station of the determination result.

In the method, the UE informs the base station of the judgment result, so that the UE can determine whether to reselect the Relay UE or further establish data transmission connection with the Remote UE according to the judgment result.

Example two: and the UE judges whether to be Relay UE of the Remote UE according to the self residual energy.

In specific implementation, optionally, the UE receives a Relay reselection request for a Relay UE sent by the base station, where the Relay reselection request is sent after the Relay UE or the base station determines that the Relay UE needs to be reselected according to reselection information of the Relay UE, and the reselection information includes performance information of a source Relay UE, or the performance information of the Relay UE and a first channel quality between the Relay UE and the source Relay UE.

Optionally, the UE receives a Relay reselection request for a Relay UE sent by the base station, where the Relay reselection request is sent after the Relay UE is determined to need to be reselected according to performance information of a source Relay UE of the Relay UE, or the performance information of the source Relay UE and channel quality between the Relay UE and the source Relay UE.

Optionally, after determining the residual energy threshold set by the user, the UE determines whether to serve as Relay UE of the Remote UE according to its own residual energy.

In the method, the UE firstly needs to determine the threshold of the corresponding self residual energy, and then determines whether to serve as Relay UE of the Remote UE according to the self residual energy, so that whether to serve as Relay UE of the Remote UE can be determined according to the self residual energy.

For example: assuming that user a sets that when UE1 has 50% remaining energy, no Remote UE is admitted, the threshold for remaining energy for UE1 may be determined to be 50%.

After the UE determines the residual energy threshold set by the user, whether the UE is Relay UE of the Remote UE is judged according to the self residual energy.

Optionally, the UE determines whether the remaining energy of the UE is greater than the remaining energy threshold, and if so, the UE is regarded as Relay UE of the Remote UE; otherwise, the UE is not used as the Relay UE of the Remote UE.

In the method, when the UE judges whether to serve as Relay UE of the Remote UE or not, and when the UE judges whether to serve as Relay UE of the Remote UE or not, the UE judges whether the residual energy is larger than the residual energy threshold value or not, if so, the UE is indicated to be sufficient in current energy, and can stably provide service for the Remote UE; and if the residual energy is not greater than the residual energy threshold, indicating that the current energy of the UE is insufficient, and returning an access refusing message. And reselecting Relay UE aiming at the Remote UE. Therefore, the problem of good and unstable signals caused by frequent switching of Relay UE due to insufficient residual energy of the UE is avoided, and the UE can provide stable communication service for the Remote UE.

For example:

assuming that no Remote UE is admitted when the remaining energy is 50%, the remaining energy threshold for UE1 is 50%. If the UE1 is determined to be the candidate Relay UE with the best channel quality after Relay UE reselection for the Remote UE, and the remaining energy of the current UE1 is 30% battery. Then, since the remaining energy threshold currently connected to the UE1 is less than the set threshold, the UE1 is not Relay UE of the Remote UE.

Optionally, the UE notifies the base station of the determination result.

In the embodiment of the present invention, when the UE determines whether to serve as Relay UE of the Remote UE according to the performance information of the UE, the processing when the performance information only includes one performance parameter may refer to the above-mentioned processing of determining whether to serve as Relay UE of the Remote UE according to the load of the UE or the UE residual energy, and therefore, details are not repeated herein.

And secondly, the UE takes any two performance parameters in the self performance information as judgment bases.

The following description will take the remaining energy of the UE and the load of the UE as an example of the judgment basis.

Example three: and the UE judges whether to be Relay UE of the Remote UE according to the self residual energy and the self load.

First, optionally, the UE receives a Relay reselection request for a Relay UE sent by the base station, where the Relay reselection request is sent after the Relay UE is determined to need to be reselected according to performance information of a source Relay UE of the Relay UE, or the performance information of the source Relay UE and a first channel quality between the Relay UE and the source Relay UE.

In the method, the UE receives a Relay reselection request aiming at the Remote UE and sent by the base station of the UE, and further judges whether the UE is the Relay UE of the Remote UE.

Optionally, after determining the residual energy threshold and the load threshold set by the user, the UE determines whether to serve as Relay UE of the Remote UE according to its own load and residual energy.

In the method, the UE firstly needs to determine the threshold of the corresponding self load and the residual energy, and then judges whether to be Relay UE of the Remote UE according to the self load and the residual energy, so that whether to be Relay UE of the Remote UE can be judged according to the self load and the residual energy.

For example: assuming that user a sets the highest number of accessible Remote UEs of UE1 to be 2, when the remaining energy is 50%, no Remote UE is admitted, it may be determined that the load threshold of UE1 is 2 and the threshold of the remaining energy of UE1 is 50%.

After the UE determines the residual energy threshold and the load threshold set by the user, whether the UE is Relay UE of the Remote UE is judged according to the load and the residual energy of the UE.

Optionally, the UE determines whether the load of the UE is smaller than the load threshold, and whether the remaining energy is larger than the remaining energy threshold, and if so, the UE is Relay UE of the Remote UE; otherwise, determining the Relay UE which is not the Remote UE.

In the method, when the UE judges whether to be Relay UE of the Remote UE, when the load and the residual energy of the UE are simultaneously used as judgment bases, the Relay UE serving as the Remote UE is determined only when the load of the UE is greater than a load threshold and the residual energy is greater than a residual energy threshold. Compared with the method, the UE can provide more stable communication service for the Remote UE.

For example:

assuming that the load threshold set by the user of the UE1 is 3 and the remaining energy threshold is 40% of power, if the current load number determined by the UE1 is 2 and the remaining energy is 70% of power, since the load number of the UE1 is smaller than the set threshold and the remaining energy of the UE1 is greater than the set threshold, the UE1 is determined as a Relay UE of the Remote UE.

Optionally, the UE notifies the base station of the determination result.

In the embodiment of the present invention, when the UE determines whether to serve as Relay UE of the Remote UE according to its own performance information, the processing when the performance information includes two performance parameters may refer to the above-mentioned determining whether to serve as Relay UE of the Remote UE according to the load of the UE and the UE residual energy, and therefore, details are not repeated here.

And thirdly, the UE takes any three performance parameters in the self performance information as judgment bases.

The following description will take the residual energy of the UE, the load of the UE, and the sidelink channel quality between the UE and the Remote UE as the determination criteria.

Example four: and the UE judges whether to be Relay UE of the Remote UE according to the self residual energy, the self load judgment and the sidelink channel quality between the UE and the Remote UE.

Optionally, after determining the residual energy threshold, the load threshold, and the sidelink channel quality threshold between the UE and the Remote UE set by the user, the UE determines whether to serve as Relay UE of the Remote UE according to the load of the UE, the residual energy, and the sidelink channel quality threshold between the UE and the Remote UE.

In the method, the UE first needs to determine a corresponding self load threshold, a corresponding residual energy threshold, and a corresponding sidelink channel quality threshold between the UE and the Remote UE, and then determines whether to serve as the Relay UE of the Remote UE according to the self load, the corresponding residual energy, and the corresponding sidelink channel quality threshold between the UE and the Remote UE, so that whether to serve as the Relay UE of the Remote UE can be determined according to the self load and the corresponding residual energy.

For example: the numerical value is used for expressing the quality of the sidelink channel between the UE and the Remote UE, and the larger the numerical value is, the better the quality of the sidelink channel between the UE and the Remote UE is;

assuming that user a sets the highest accessible Remote UE number of UE1 to be 2, when the remaining energy is 50%, no Remote UE is admitted; or when the si delink channel quality between the UE and the Remote UE is lower than 20, not admitting any Remote UE; it may be determined that the loading threshold for UE1 is 2, the threshold for the remaining energy for UE1 is 50%, and the sidelink channel quality threshold between the UE and the RemoteUE is 20.

After the UE determines the residual energy threshold value, the load threshold value and the sidelink channel quality threshold value between the UE and the Remote UE, whether the UE is Relay UE of the Remote UE is judged according to the load of the UE, the residual energy and the sidelink channel quality between the UE and the Remote UE.

Optionally, the UE determines whether the load of the UE is smaller than the load threshold, and whether the residual energy is larger than the residual energy threshold, and whether the sidelink channel quality between the UE and the Remote UE is larger than or equal to a set sidelink channel quality threshold, if so, the UE is a Relay UE of the Remote UE; otherwise, determining the Relay UE which is not the Remote UE.

In the method, only when the load of the UE is greater than the load threshold, the residual energy is greater than the residual energy threshold, and the sidelink channel quality between the UE and the Remote UE is greater than or equal to the set sidelink channel quality threshold between the UE and the Remote UE, the Relay UE serving as the Remote UE is determined. Compared with the method, the scheme can ensure that Relay UE accessed by Remote UE is more stable, and further improves the system performance.

For example:

assuming that the load threshold set by the user of the UE1 is 3, the remaining energy threshold is 40% of power, and the sidelink channel quality threshold between the UE and the Remote UE is 22, if the current load number determined by the UE1 is 2, the remaining energy is 70% of power, and the sidelink channel quality between the UE1 and the Remote UE is 25, since the load number of the UE1 is less than the set threshold, the remaining energy of the UE1 is greater than the set threshold, and the sidelink channel quality between the UE1 and the Remote UE is greater than the set sidelink channel quality threshold, the UE1 is determined as a Relay UE of the Remote UE.

Optionally, the UE notifies the base station of the determination result.

In the embodiment of the present invention, when the UE determines whether to serve as the Relay UE of the Remote UE according to the performance information of the UE, the processing when the performance information includes three performance parameters may refer to the above-mentioned determining whether to serve as the Relay UE of the Remote UE according to the load of the UE, the remaining energy of the UE, and the sidelink channel quality between the UE and the Remote UE, which is not described herein again.

And fourthly, the UE takes any four performance parameters in the self performance information as judgment bases.

The following description takes the residual energy of the UE, the load of the UE, the sidelink channel quality between the UE and the Remote UE, and the Uulink channel quality between the UE and the base station as the judgment basis.

Example five: and the UE judges whether to be Relay UE of the Remote UE according to the self residual energy, the self load judgment, the sidelink channel quality between the UE and the Remote UE and the Uulink channel quality between the UE and the base station.

Optionally, after determining the residual energy threshold, the load threshold, and the sidelink channel quality threshold between the UE and the Remote UE set by the user, the UE determines whether to serve as the Relay UE of the Remote UE according to the load of the UE, the residual energy, the sidelink channel quality between the UE and the Remote UE, and the Uulink channel quality between the UE and the base station.

In the method, the UE first needs to determine a corresponding self load threshold, a corresponding residual energy threshold, a corresponding sidelink channel quality threshold between the UE and the Remote UE, and a corresponding Uulink channel quality threshold between the UE and the base station, and then determines whether to serve as the Relay UE of the Remote UE according to the self load, the corresponding residual energy, the corresponding sidelink channel quality threshold between the UE and the Remote UE, and the corresponding Uulink channel quality threshold between the UE and the base station, so that whether to serve as the Relay UE of the Remote UE can be determined according to the self performance information.

For example: the numerical value is used for expressing the sidelink channel quality between the UE and the Remote UE and the Uulink channel quality between the UE and the base station, and the larger the numerical value is, the better the corresponding channel quality is expressed;

assuming that user a sets the highest accessible Remote UE number of UE1 to be 2, when the remaining energy is 50%, no Remote UE is admitted; and when the si delink channel quality between the UE and the Remote UE is lower than 20, no Remote UE is admitted; and when the quality of the Uulink channel between the UE and the base station is lower than 20, no Remote UE is admitted; it may be determined that the loading threshold of the UE1 is 2, the threshold of the remaining energy of the UE1 is 50%, the sidelink channel quality threshold between the UE and the Remote UE is 20, and the Uulink channel quality threshold between the UE and the base station is 20.

After the UE determines the residual energy threshold value, the load threshold value, the sidelink channel quality threshold value between the UE and the Remote UE and the Ullink channel quality threshold value between the UE and the base station, which are set by the user, whether the UE is the Relay UE of the Remote UE is judged according to the load of the UE, the residual energy, the sidelink channel quality between the UE and the Remote UE and the Ullink channel quality between the UE and the base station.

Optionally, the UE determines whether the load of the UE is smaller than the load threshold, and whether the residual energy is larger than the residual energy threshold, and whether the sidelink channel quality between the UE and the Remote UE is larger than or equal to a set sidelink channel quality threshold, and whether the uuink channel quality between the UE and the base station is larger than or equal to a set uuink channel quality threshold; if yes, Relay UE as the Remote UE; otherwise, determining the Relay UE which is not the Remote UE.

In the method, only when the load of the UE is greater than the load threshold, the residual energy is greater than the residual energy threshold, the sidelink channel quality between the UE and the Remote UE is greater than or equal to the set sidelink channel quality threshold between the UE and the Remote UE, and the Ulink channel quality between the UE and the base station is greater than or equal to the set Ulink channel quality threshold, the Relay UE serving as the Remote UE is determined. Compared with the method, the scheme can ensure that Relay UE accessed by Remote UE is more stable, and further improves the system performance.

For example:

assuming that the load threshold set by the user of the UE1 is 3, the residual energy threshold is 40% of electricity, the sidelink channel quality threshold between the UE and the Remote UE is 22, and the Uulink channel quality threshold between the UE and the base station is 23;

if the current load number determined by the UE1 is 2, the remaining energy is 70% of power, the sildenk channel quality between the UE1 and the Remote UE is 25, and the Uulink channel quality between the UE and the base station is 25, then since the load number of the UE1 is smaller than the set threshold, and the remaining energy of the UE1 is greater than the set threshold, and the sildenk channel quality between the UE1 and the Remote UE is greater than the set sildenk channel quality threshold, and the Uulink channel quality between the UE and the base station is greater than or equal to the set Uulink channel quality threshold, the UE1 is determined as the Relay UE of the Remote UE.

Optionally, the UE notifies the base station of the determination result.

In the embodiment of the present invention, when the UE determines whether to serve as the Relay UE of the Remote UE according to the performance information of the UE, the processing when the performance information includes four performance parameters may refer to the above-mentioned determination of whether to serve as the Relay UE of the Remote UE by using the load of the UE, the remaining energy of the UE, the sidelink channel quality between the UE and the Remote UE, and the Uulink channel quality between the UE and the base station, which is not described herein again.

And fifthly, the UE takes the five performance parameters listed in the self performance information as judgment basis.

The following description will take the remaining energy of the UE, the load of the UE, the sidelink channel quality between the UE and the Remote UE, the uuink channel quality between the UE and the base station, and the ID of the cell to which the UE belongs as the judgment basis.

Example five: and the UE judges whether to be Relay UE of the Remote UE according to the self residual energy, the self load judgment, the sidelink channel quality between the UE and the Remote UE, the Uulink channel quality between the UE and the base station and the ID of the cell to which the UE belongs.

Optionally, after determining the residual energy threshold, the load threshold, and the sidelink channel quality threshold between the UE and the Remote UE set by the user, the UE determines whether to serve as the Relay UE of the Remote UE according to the load of the UE, the residual energy, the sidelink channel quality between the UE and the Remote UE, the Uulink channel quality between the UE and the base station, and the ID of the cell to which the UE belongs.

In the method, the UE first needs to determine a corresponding self load threshold, a corresponding residual energy threshold, a corresponding sidelink channel quality threshold between the UE and the Remote UE, a corresponding Uulink channel quality threshold between the UE and the base station, and an ID of a cell to which the Remote UE belongs, and then determines whether to serve as the Relay UE of the Remote UE according to the self load, the corresponding residual energy, the corresponding sidelink channel quality between the UE and the Remote UE, the corresponding Uulink channel quality threshold between the UE and the base station, and the ID of the cell to which the Remote UE belongs, so that whether to serve as the Relay UE of the Remote UE can be determined according to the self performance information.

For example: using the numerical value to represent the sidelink channel quality between the UE and the Remote UE and the Ullink channel quality between the UE and the base station, wherein the larger the numerical value is, the better the corresponding channel quality is, wherein the ID of the cell of the UE and the ID of the cell of the Remote UE can be obtained by the base station;

Optionally, the UE determines whether the load of the UE is smaller than the load threshold, and whether the residual energy is larger than the residual energy threshold, and whether the sidelink channel quality between the UE and the Remote UE is larger than or equal to a set sidelink channel quality threshold, and whether the Uulink channel quality between the UE and the base station is larger than or equal to a set Uulink channel quality threshold, and whether the ID of the cell to which the UE belongs is the same as the ID of the cell to which the Remote UE belongs; if yes, Relay UE as the Remote UE; otherwise, determining the Relay UE which is not the Remote UE.

In the method, only when the load of the UE is greater than the load threshold, the residual energy is greater than the residual energy threshold, the sidelink channel quality between the UE and the Remote UE is greater than or equal to the set sidelink channel quality threshold between the UE and the Remote UE, the Uulink channel quality between the UE and the base station is greater than or equal to the set Uulink channel quality threshold, and the UE and the Remote UE belong to the same cell, the Relay UE serving as the Remote UE is determined. Compared with the method, the scheme can ensure that Relay UE accessed by Remote UE is more stable, and further improves the system performance.

For example:

if the current load number determined by the UE1 is 2, the remaining energy is 70% of electricity, the sidelink channel quality between the UE1 and the Remote UE is 25, the Uulink channel quality between the UE and the base station is 25, and the ID of the cell to which the UE1 belongs is determined to be the same as the ID of the cell to which the Remote UE belongs, then since the load number of the UE1 is less than the set threshold, the remaining energy of the UE1 is greater than the set threshold, the sidelink channel quality between the UE1 and the Remote UE is greater than the set sidelink channel quality threshold, and the Uulink channel quality between the UE and the base station is greater than or equal to the set Uulink channel quality threshold, and it is determined that the UE1 and the Remote UE are located within the same cell range, it is determined that the UE1 is a Relay UE of the Remote UE.

Optionally, the UE notifies the base station of the determination result.

In the embodiments of the present invention, only some embodiments are illustrated, and in the specific implementation process, different determination criteria may be set according to specific implementation scenarios.

And when the selected UE agrees to be target Relay UE of the Remote UE, the Remote UE establishes connection with the UE and performs data transmission with the base station through the UE.

Optionally, after the UE notifies the base station of the determination result, if the UE is a Relay UE of the Remote UE as the determination result, the UE establishes a PC5 connection with the Remote UE.

Optionally, after establishing the PC5 connection between the UE and the Remote UE, the UE and the Remote UE perform RRC sidelink connection reconfiguration, so as to establish an RRC sidelink connection between the UE and the Remote UE.

The purpose of RRC sidelink connection reconfiguration is to modify RRC connection, for example, to establish, modify or release RBs, to perform handover, to establish, modify or release measurements.

When the UE and the Remote UE carry out RRC sidelink connection Reconfiguration, firstly the UE receives an RRC connection Reconfiguration message sent by a network terminal, and then according to a configuration item in the RRC connection Reconfiguration message, in a specific execution process, the following processes are sequentially executed:

if the RRC connection reconfiguration message contains measConfig, performing modification of a measurement configuration part;

if the RRC connection reconfiguration message contains the Mobility control info, switching is executed;

if the RRC connection reconfiguration message contains the decrypted InformatISList, transmitting the field part to the upper layer;

if the RRC connection reconfiguration message contains the radioResourceConfigDedcated, reconfiguring the radio bearer, the data radio bearer, the transmission channel and the physical channel according to the message content;

if the RRC connection reconfiguration message contains securityConfigHO, executing the switching;

and if all the five configuration items can be successfully executed, finishing RRC connection reconfiguration.

The triggering device is Remote UE, the source Relay UE and the destination Relay UE are located in the coverage area of the same base station, and an RRC sidelink between the Remote UE and the Relay UE is a bidirectional transmission type, which is a flow timing diagram of a method for reselecting the Relay UE, as shown in fig. 2.

As shown in fig. 2, the present invention provides a flowchart of a method for reselecting a Relay UE.

Step 200, data are sent and received between the Remote UE and the base station through Relay UE 1;

step 201, Relay UE inserts its own residual energy information into data periodically;

step 202, a base station configures Relay UE reselection configuration for a Remote UE, wherein the Relay UE reselection configuration comprises a channel quality threshold and/or a residual energy threshold;

step 203, the Remote UE measures the current sidelink channel quality through SD-RSRP, and judges whether the reselection condition is met according to the channel quality and the residual energy of the current Relay UE;

step 204, the Remote UE measures the candidate sidelink channel quality by SD-RSRP and selects a target Relay;

step 205, the Remote UE sends a Relay reselection request to the base station, wherein the request message carries destination Relay information;

step 206, the base station sends a Relay reselection request to a Relay UE2, wherein the request message carries destination Relay information;

step 207, the Relay UE2 determines whether to act as a Relay of the Remote UE;

step 208, the Relay UE2 sends a Relay reselection confirm message to the base station;

step 209, the base station sends a Relay reselection confirmation message to the Remote UE;

step 210, establishing PC5 connection between Remote UE and Relay UE 2;

step 211, establishing RRC connection between the Relay UE2 and the base station;

step 212, disconnecting the PC5 connection between the Remote UE and the Relay UE 1;

step 213, the base station performs RRC sidelink reconfiguration for the Remote UE via Relay UE 2;

in step 214, the Remote UE and the base station send and receive data through the Relay UE 2.

A flow timing diagram of a method for reselecting a Relay UE, where the triggering device is a Relay UE, the source Relay UE and the destination Relay UE are located in coverage areas of different base stations, and an RRC sidelink between the Relay UE and the Relay UE is a unidirectional transmission type, as shown in fig. 3.

Step 300, data are sent and received between the Remote UE and the base station through Relay UE 1;

step 301, Relay UE1 measures RRC sidelink channel quality by SD-RSRP;

step 302, the Relay UE1 sends the measured RRC sidelink quality to the base station;

step 303, the base station sends the RRC sidelink quality reported by Relay UE1 to the Remote UE;

step 304, the Remote UE measures the current sidelink channel quality through SD-RSRP, and judges whether the reselection condition is met according to the channel quality and the residual energy of the current Relay UE;

step 303, the Remote UE measures the quality of the candidate sidelink channel through SD-RSRP and selects a target Relay;

step 306, the Remote UE sends a Relay reselection request to the base station of the Relay UE1, and the base station of the Relay UE1 transfers the request to the base station of the Relay UE2, wherein the request message carries destination Relay information;

step 307, Relay UE2 determines whether to act as a Relay of the Remote UE;

step 308, the base station of the Relay UE2 sends a Relay reselection request to the Relay UE2, wherein the request message carries purposeful Relay information;

step 309, the Relay UE2 sends a Relay reselection confirm message to the base station of the Relay UE 2;

step 310, the base station of Relay UE2 sends a Relay reselection confirmation message to the Remote UE;

step 311, establishing PC3 connection between Remote UE and Relay UE 2;

step 312, establishing RRC connection between the Relay UE2 and the base station of the Relay UE 2;

step 313, disconnecting the PC3 connection between the Remote UE and the Relay UE 1;

step 314, the base station of Relay UE2 performs RRC sidelink reconfiguration for the Remote UE via Relay UE 2;

in step 315, the Remote UE and the base station send and receive data through the Relay UE 2.

The triggering device is a base station, the Remote UE, the source Relay UE and the destination Relay UE are located in the coverage area of the same base station, and the RRC sidelink between the Remote UE and the Relay UE is a bidirectional transmission type, which is shown in fig. 4.

As shown in fig. 4, the present invention provides a flowchart of a method for reselecting a Relay UE.

Step 400, data are sent and received between the Remote UE and the base station through Relay UE 1;

step 401, the Relay UE1 measures the RRC sidelink channel quality by SD-RSRP;

step 402, the Relay UE1 sends the measured RRC sidelink quality report to the base station;

step 403, the base station judges whether a reselection condition is met according to the channel quality and the residual energy of the source Relay UE 1;

step 404, the base station sends a Relay reselection notification to the Remote UE;

step 405, the Remote UE measures the quality of the current sidelink channel through SD-RSRP;

step 406, the Remote UE uploads the measured candidate sidelink channel quality to the base station;

step 407, the base station selects the target Relay UE according to the candidate sidelink channel quality report uploaded by the Remote UE;

step 408, the base station sends a Relay reselection request to the Relay UE2, wherein the request message carries destination Relay information;

step 409, Relay UE2 decides whether to act as a Relay for the Remote UE;

step 44, Relay UE2 sends a Relay reselection confirm message to the base station;

step 411, the base station sends a Relay reselection acknowledgement message to the Remote UE;

step 412, establishing PC5 connection between the Remote UE and the Relay UE 2;

step 413, establishing RRC connection between the Relay UE2 and the base station;

step 414, disconnecting the PC5 between the Remote UE and the Relay UE 1;

step 415, the base station performs RRC sidelink reconfiguration for the Remote UE via Relay UE 2;

step 416, the Remote UE and the base station send and receive data through the Relay UE 2.

The triggering device is a base station, the source Relay UE and the destination Relay UE are in coverage areas of different base stations, and the RRC sidelink between the Remote UE and the Relay UE is a bidirectional transmission type, as shown in fig. 5, a flowchart of a method for reselecting the Relay UE.

Step 500, data are sent and received between the Remote UE and the base station through Relay UE 1;

step 501, the Relay UE1 measures the RRC sidelink channel quality through SD-RSRP;

step 502, the Relay UE1 sends the measured RRC sidelink channel quality report to the base station;

step 503, the base station judges whether a reselection condition is satisfied according to the channel quality and the residual energy;

step 504, the base station sends a Relay reselection notification to the Remote UE;

step 505, the Remote UE measures the current sidelink channel quality through SD-RSRP;

step 506, the Remote UE sends a candidate sidelink channel quality report to the base station;

step 505, the base station selects Relay UE2 according to the candidate sidelink channel quality report uploaded by the Remote UE;

step 508, the Remote UE sends a Relay reselection request to the base station of Relay UE1, and the base station of Relay UE1 transfers to the base station of Relay UE2, where the request message carries destination Relay information;

step 509, Relay UE2 determines whether to be the Relay of the Remote UE;

step 510, a base station of a Relay UE2 sends a Relay reselection request to a Relay UE2, wherein the request message carries purposeful Relay information;

step 511, the Relay UE2 sends a Relay reselection confirm message to the base station of the Relay UE 2;

step 512, the base station of Relay UE2 sends a Relay reselection confirmation message to the Remote UE;

step 513, establishing a PC5 connection between the Remote UE and the Relay UE 2;

step 514, establishing RRC connection between the Relay UE2 and the base station of the Relay UE 2;

step 515, disconnecting the PC5 connection between the Remote UE and the Relay UE 1;

step 516, the base station of Relay UE2 performs RRC sidelink reconfiguration for the Relay UE via Relay UE 2;

step 517, the Remote UE and the base station send and receive data through Relay UE 2.

Based on the same inventive concept, the embodiment of the present invention further provides a device for reselecting Relay UE, and since the trigger device and the UE in the device are the Remote UE, the base station, and the UE in the embodiment of the present invention, and the principle of the device for solving the problem is similar to that of the method, the implementation of the device may refer to the implementation of the method, and repeated details are omitted.

As shown in fig. 6, an embodiment of the present invention provides an apparatus for reselecting a Relay UE, where the apparatus includes:

at least one processing unit 600 and at least one memory unit 601, wherein said memory unit stores program code which, when executed by said processing unit 600, causes said processing unit 600 to perform the following processes:

receiving a Relay reselection request aiming at a Remote UE and sent by the base station; judging whether to serve as Relay UE of the Remote UE according to the performance information of the Relay UE; notifying the base station of the judgment result, wherein the Relay reselection request is sent after the Relay UE or the base station determines that the Relay UE needs to be reselected according to reselection information, and the reselection information comprises performance information of source Relay UE, or the performance information of the Relay UE and the channel quality between the Relay UE and the source Relay UE;

wherein the capability information of the UE includes part or all of the following:

Optionally, the processing unit 600 is specifically configured to:

judging whether the load of the UE is smaller than the load threshold value, if so, taking the UE as Relay UE of the Remote UE; otherwise, determining Relay UE which is not the Remote UE; and/or

Judging whether the performance information is larger than the performance information threshold value, if so, taking the performance information as Relay UE of the Remote UE; otherwise, determining Relay UE which is not the Remote UE; and/or

Judging whether the first channel quality between the UE and the Remote UE is greater than the first channel quality threshold value, if so, taking the UE as Relay UE of the Remote UE; otherwise, determining Relay UE which is not the Remote UE; and/or

Judging whether the quality of a second channel between the UE and the base station is greater than the second channel quality threshold value, if so, taking the second channel quality as Relay UE of the Remote UE; otherwise, determining Relay UE which is not the Remote UE; and/or

Judging whether the ID of the cell to which the UE belongs is the same as the ID of the cell to which the Remote UE belongs, and if so, taking the cell as the Relay UE of the Remote UE; otherwise, determining the Relay UE which is not the Remote UE.

Optionally, the processing unit 600 is further configured to:

and determining the performance information threshold set by the user before judging whether the Relay UE is the Relay UE of the Remote UE according to the performance information of the Relay UE.

Optionally, the processing unit 600 is further configured to:

after the base station is notified of the determination result, if the UE is a Relay UE of the Remote UE as the determination result, a PC5 connection is established with the Remote UE.

Optionally, the processing unit 600 is further configured to:

after establishing PC5 connection with the Remote UE, performing RRC sidelink connection reconfiguration with the Remote UE, thereby establishing RRC sidelink connection with the Remote UE.

As shown in fig. 7, an embodiment of the present invention provides a UE for reselecting a Relay UE, where the UE includes:

a receiving module 700, configured to receive a Relay reselection request for a Relay UE sent by the base station, where the Relay reselection request is sent after the Relay UE or the base station determines that the Relay UE needs to be reselected according to performance information of a source Relay UE of the Relay UE, or the performance information of the Relay UE and channel quality between the Relay UE and the source Relay UE;

a determining module 701, configured to determine whether to serve as Relay UE of the Remote UE according to performance information of the determining module;

a notification module 702, configured to notify the base station of the determination result;

Optionally, the determining module 701 is specifically configured to:

Optionally, the determining module 701 is further configured to:

Optionally, the notification module 702 is further configured to:

The present application is described above with reference to block diagrams and/or flowchart illustrations of methods, apparatus (systems) and/or computer program products according to embodiments of the application. It will be understood that one block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, and/or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer and/or other programmable data processing apparatus, create means for implementing the functions/acts specified in the block diagrams and/or flowchart block or blocks.

Accordingly, the subject application may also be embodied in hardware and/or in software (including firmware, resident software, micro-code, etc.). Furthermore, the present application may take the form of a computer program product on a computer-usable or computer-readable storage medium having computer-usable or computer-readable program code embodied in the medium for use by or in connection with an instruction execution system. In the context of this application, a computer-usable or computer-readable medium may be any medium that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A method for reselecting a Relay terminal (Relay UE), the method comprising:

the method comprises the steps that UE receives a Relay reselection request which is sent by a base station and aims at Remote terminal Relay UE, wherein the Relay reselection request is sent after the Relay UE or the base station determines that the Relay UE needs to be reselected according to reselection information, and the reselection information comprises residual energy of source Relay UE or the residual energy of the Relay UE and first channel quality between the Relay UE and the source Relay UE;

the UE judges whether to be Relay UE of the Remote UE according to the performance information of the UE;

the UE informs the base station of the judgment result;

2. The method of claim 1, wherein the UE determining whether to be a Relay UE of the Remote UE according to its own performance information comprises:

the UE judges whether the load of the UE is smaller than the load threshold value, if so, the UE is used as Relay UE of the Remote UE; otherwise, determining Relay UE which is not the Remote UE; and/or

The UE judges whether the first channel quality between the UE and the Remote UE is greater than the first channel quality threshold value, if so, the UE is used as Relay UE of the Remote UE; otherwise, determining Relay UE which is not the Remote UE; and/or

The UE judges whether the ID of the cell to which the UE belongs is the same as the ID of the cell to which the Remote UE belongs, and if so, the UE is used as Relay UE of the Remote UE; otherwise, determining the Relay UE which is not the Remote UE.

3. The method of claim 2, wherein the UE determines whether to act as a Relay UE of the Remote UE before according to its own load and/or performance information, further comprising:

the UE determines a threshold value of the performance information set by a user.

4. The method of claim 1, wherein after the UE notifies the base station of the determination result, the method further comprises:

and if the UE is used as Relay UE of the Remote UE according to the judgment result, establishing PC5 connection between the UE and the Remote UE.

5. The method of claim 4, wherein after establishing the PC5 connection between the UE and the Remote UE, further comprising:

and the UE and the Remote UE carry out RRC sidelink connection reconfiguration on a radio resource control channel, so as to establish RRC sidelink with the Remote UE.

6. A UE that reselects a Relay UE, the apparatus comprising:

at least one processing unit and at least one memory unit, wherein the memory unit stores program code that, when executed by the processing unit, causes the processing unit to perform the following:

receiving a Relay reselection request aiming at a Remote UE sent by a base station of the UE; judging whether to serve as Relay UE of the Remote UE according to the performance information of the Relay UE; notifying the base station of the judgment result, wherein the Relay reselection request is sent after the Relay UE or the base station determines that the Relay UE needs to be reselected according to reselection information, and the reselection information comprises the residual energy of the source Relay UE, or the residual energy of the Relay UE and the first channel quality between the Relay UE and the source Relay UE;

7. The UE of claim 6, wherein the processing unit is specifically configured to:

Judging whether the residual energy is larger than the residual energy threshold value, if so, taking the residual energy as Relay UE of the Remote UE; otherwise, determining Relay UE which is not the Remote UE; and/or

8. The UE of claim 7, wherein the processing unit is further to:

9. The UE of claim 6, wherein the processing unit is further to:

10. The UE of claim 9, wherein the processing unit is further to:

11. An apparatus for selecting a Relay UE, the apparatus comprising:

a receiving module, configured to receive a Relay reselection request for a Relay UE sent by the base station, where the Relay reselection request is sent after the Relay UE is determined to need to be reselected according to the Remote UE or the base station according to performance information of a source Relay UE of the Relay UE, or the performance information of the Relay UE and a first channel quality between the Relay UE and the source Relay UE;

the judging module is used for judging whether the Relay UE is the Relay UE of the Remote UE according to the performance information of the judging module;

a notification module, configured to notify the base station of the determination result;