CN110611901A - Method and equipment for reselecting Relay UE - Google Patents

Method and equipment for reselecting Relay UE Download PDF

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Publication number
CN110611901A
CN110611901A CN201810635083.XA CN201810635083A CN110611901A CN 110611901 A CN110611901 A CN 110611901A CN 201810635083 A CN201810635083 A CN 201810635083A CN 110611901 A CN110611901 A CN 110611901A
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China
Prior art keywords
relay
remote
base station
user plane
candidate
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CN201810635083.XA
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Chinese (zh)
Inventor
张传欣
马路娟
孙紫微
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Hisense Group Co Ltd
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Hisense Group Co Ltd
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Priority to CN201810635083.XA priority Critical patent/CN110611901A/en
Publication of CN110611901A publication Critical patent/CN110611901A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/22—Performing reselection for specific purposes for handling the traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/04—Communication route or path selection, e.g. power-based or shortest path routing based on wireless node resources
    • H04W40/10—Communication route or path selection, e.g. power-based or shortest path routing based on wireless node resources based on available power or energy
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point

Abstract

The invention discloses a method and equipment for reselecting Relay UE (user equipment), which are used for solving the problem that no related scheme for reselecting Relay UE for Remote UE exists in a CU separation scene in the prior art. When a base station is connected with a user plane of a Remote UE through a source Remote UE, determining reselection information, judging whether to perform Remote UE reselection on the user plane of the Remote UE according to the reselection information, and then selecting a target Remote UE according to information for selecting the target Remote UE, which is reported by a control plane of the Remote 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.
D2D (Device-to-Device), terminal-through technology, means that a nearby user terminal can communicate through a direct link without being forwarded through a base station. Because the D2D mode communication has the characteristics of short distance and direct connection, compared with the cellular mode communication, the D2D mode communication has wide prospects in the aspects of improving the system throughput and reducing the power consumption of users.
Among the various terminals of the internet of things, some terminals (Remote UEs) may perform data transmission with the base station via a Relay UE by establishing a D2D communication link with another Relay UE. And the D2D auxiliary Relay system proposed based on the D2D communication technology, that is, a user-to-Network Relay (UE-to-Network Relay) technology, uses one of the users in the D2D pair as a Relay user, and forwards a signal for another user out of the coverage range or with poor signal quality, so that the system coverage can be effectively extended, and the power consumption of the user is reduced.
Mobility is the most fundamental characteristic in a mobile communication system. Mobility management techniques are intended to ensure that users move across the system at various speeds, providing seamless consistent user experience for the users as they move across cells.
In a UE-to-Network Relay scenario, even when a Remote UE has established a connection with a Network system, the Remote UE needs to perform Relay reselection when the mobility of the Remote UE and the randomness of a radio link are lower than a certain threshold condition.
The 3GPP (3rd Generation Partnership Project) proposes a CU (Control Plane and User Plane) separation scenario, that is, a Control Plane and a User Plane of a terminal are separated, specifically, the Control Plane of the UE is connected via a macro cell base station link, and the User Plane is connected via a small cell base station link under the Control of the macro cell. The CU separation method has an advantage that a macro cell side maintains a UE (User Equipment) related list, and a small cell side provides a higher data transmission service for the UE. By pooling network service resources, the utilization rate of address resources can be effectively improved, and user session resources are greatly saved; network configuration is reduced through centralized management and control. However, in the existing CU separation scenario, when Relay UE currently connected to Remote UE cannot maintain Relay capability, there is no specific scheme for how to select Relay UE for Remote UE.
In summary, there is no relevant scheme for reselecting Relay UE for Remote UE in the CU separation scenario.
Disclosure of Invention
The invention provides a method and equipment for reselecting Relay UE (user equipment), which are used for solving the problem that no relevant scheme for reselecting Relay UE for Remote UE exists in a CU separation scene 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 base station is connected with the user plane of the Remote UE through the source Relay UE; then determining reselection information, wherein the reselection information comprises part or all of the following: first channel quality between a user plane of source Relay UE and a user plane of Remote UE, second channel quality between a base station and a control plane of Remote UE, residual energy of the source Relay UE, load of the source Relay UE, and third channel quality between the source Relay UE and the base station; and finally, judging whether to carry out the reselection of the Relay UE aiming at the user plane of the Remote UE according to the reselection information.
In the method, when the base station is connected with the user plane of the Remote UE through the source Remote UE, the reselection information is determined, whether the Remote UE is reselected aiming at the user plane of the Remote UE is judged according to the reselection information, and then the target Remote UE is selected according to the information which is reported by the control plane of the Remote UE and is used for selecting the target Remote UE. In the embodiment of the invention, the target Relay UE can be selected according to part or all of the measured information for selecting the target Relay UE, and compared with the prior art, the embodiment of the invention provides a scheme for reselecting the Relay UE for the Remote UE aiming at the CU separation scene, so that the communication capacity of the Remote UE is improved, and the system performance is improved.
In a possible implementation manner, the base station determines whether to perform reselection of Relay UE for the user plane of the Remote UE according to the reselection information, and configures measurement parameters to the Remote UE after determining that the Relay UE needs to be reselected for the user plane of the Remote UE; then the base station selects the target Relay UE according to the information which is reported by the control plane of the Remote UE and is used for selecting the target Relay UE; wherein the information for selecting the target Relay UE includes part or all of the following: the residual energy of the candidate Relay UE, the load of the candidate Relay UE, the first channel quality between the user plane of the candidate Relay UE and the user plane of the Remote UE, the third channel quality between the candidate Relay UE and the base station, and the ID of the cell to which the candidate Relay UE belongs.
In the method, when the Relay UE is determined to need to be reselected aiming at the Relay UE, the Relay UE determines information for selecting the target Relay UE according to the measurement parameters configured by the base station, reports the information for selecting the target Relay UE to the base station, and then determines the target Relay UE according to the received information for selecting the target Relay UE. And then the user plane of the Remote UE can be connected with the user plane of the target Remote UE, so that the Relay service can be provided for the Remote UE after the source Remote UE connected with the Remote UE cannot continue, the Remote UE is triggered to reselect, the Remote UE is connected with the selected user plane of the target Remote UE, and data transmission is carried out through the target Remote UE, therefore, the communication capacity of the Remote UE can be improved, and the system performance is improved.
In a possible implementation manner, when the base station selects a target Relay UE according to information for selecting the target Relay UE reported by a control plane of the Relay UE, first, for any candidate Relay UE, the base station determines a priority factor of the candidate Relay UE according to information corresponding to the candidate Relay UE in the information for selecting the target Relay UE and a preset weight; and then selecting the candidate Relay UE corresponding to the maximum priority factor as the target Relay UE.
According to the method, when the base station selects the target Relay UE according to the information for selecting the target Relay UE reported by the control plane of the Relay UE, the performance parameters of a plurality of candidate Relay UEs can be taken into account, so that the performance of the obtained target Relay UE is most stable, stable and continuous Relay service can be provided for the Relay UE in the moving process of the Relay UE, and the system performance is improved.
In a possible implementation manner, the base station determines a Relay UE meeting requirements from all candidate Relay UEs, wherein a result obtained after comparing each piece of information corresponding to the Relay UE meeting requirements in the information for selecting the target Relay UE with a corresponding threshold value meets requirements; and then selecting target Relay UE from the Relay UEs meeting the requirements.
In the method, the base station compares each piece of information of the candidate Relay UE for selecting the target Relay UE with the corresponding set threshold value, determines the candidate Relay UE of which each piece of information of all the information for selecting the target Relay UE meets the requirement, and then selects the target Relay UE from the determined candidate Relay UE. In this way, the base station may select the target Relay UE according to some candidate Relay UEs with relatively better performance determined from all the candidate Relay UEs, so that the stability of the system performance may be improved.
In a second aspect, an embodiment of the present invention provides a method for reselecting a Relay UE, where the method includes:
when the control plane of the Remote UE is connected with the base station; after the Relay UE needs to be reselected, determining information for selecting the target Relay UE according to the measurement parameters configured by the base station; reporting the information for selecting the target Relay UE to the base station so that the base station selects the target Relay UE;
wherein the information for selecting the target Relay UE includes part or all of the following:
the residual energy of the candidate Relay UE, the load of the candidate Relay UE, the first channel quality between the user plane of the candidate Relay UE and the user plane of the Remote UE, the third channel quality between the candidate Relay UE and the base station, and the ID of the cell to which the candidate Relay UE belongs.
According to the method, after the Remote UE determines that Relay UE needs to be selected, the Relay UE can perform measurement according to measurement parameters configured by the service base station, information used for selecting the target Relay UE is further determined, the measured information used for selecting the target Relay UE is reported to the service base station, and the target Relay UE is finally determined by the service base station according to the reported information used for selecting the target Relay UE. In the embodiment of the invention, the target Relay UE can be selected according to part or all of the measured information for selecting the target Relay UE, and compared with the prior art, the embodiment of the invention provides a scheme for reselecting the Relay UE for the Remote UE aiming at the CU separation scene, so that the communication capacity of the Remote UE is improved, and the system performance is improved.
In a possible implementation manner, the control plane of the Remote UE receives the measurement parameters configured by the base station through an RRC connection reconfiguration message, and determines information for selecting the target Relay UE according to the measurement parameters configured by the base station.
In the method, after receiving the measurement parameters configured by the base station through the RRC connection reconfiguration message, the control plane of the Remote UE measures each parameter of the candidate Relay UE according to the configured measurement parameters, and then reports the measurement parameters to the serving base station, so that the target Relay UE can be selected from the candidate Relay UEs according to the information for selecting the target Relay UE.
In a third aspect, an embodiment of the present invention further provides a Remote UE for reselecting a Relay UE, where the Remote UE includes: at least one processor and at least one memory, the apparatus having functionality to implement the embodiments of the first aspect described above.
In a fourth aspect, an embodiment of the present invention further provides a base station for reselecting a Relay UE, where the base station includes: at least one processor and at least one memory, the apparatus having functionality to implement the embodiments of the second aspect described above.
In a fifth aspect, an embodiment of the present invention further provides a Remote UE for reselecting a Relay UE, where the Remote UE includes a determining module and a determining module, and the device has functions of implementing the embodiments of the first aspect.
In a sixth aspect, an embodiment of the present invention further provides a base station for reselecting Relay UE, where the base station includes a determining module and an information reporting module, and the base station has a function of implementing each embodiment of the second aspect.
In addition, for technical effects brought by any one implementation manner of the third aspect to the sixth 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 schematic structural diagram of a system for reselecting a Relay UE according to an embodiment of the present invention;
fig. 2 is a schematic view of a scenario that quality of a uuink channel between a base station and a control plane of a Remote UE continuously meets a data transmission requirement of the control plane in a Remote mobile process according to an embodiment of the present invention;
fig. 3 is a timing diagram of a scenario one in which the quality of a uuink channel between a base station and a control plane of a Remote UE continuously meets a data transmission requirement of the control plane in the Remote mobility process according to the embodiment of the present invention;
fig. 4 is a schematic diagram of a second scenario in which the quality of the Uulink channel between the base station and the control plane of the Remote UE gradually fails to meet the data transmission requirement of the control plane during the Remote mobility according to the embodiment of the present invention;
fig. 5 is a timing diagram of a second scenario where the quality of the uuink channel between the base station and the control plane of the Remote UE gradually fails to meet the data transmission requirement of the control plane during the Remote mobility according to the embodiment of the present invention;
fig. 6 is a schematic view of a complete flow chart of a method for reselecting a Relay UE according to an embodiment of the present invention;
fig. 7 is a schematic flowchart of a base station side of a method for reselecting a Relay UE according to an embodiment of the present invention;
fig. 8 is a schematic flowchart of a Remote UE side of a method for reselecting a Relay UE according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a first base station according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a first Remote UE according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a second base station according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a second Remote 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. And the user plane of the Remote UE is connected with the base station through the Relay UE. When the base station has user plane data to be transmitted to the Remote UE, transmitting the user plane data information to the Relay UE, and transmitting the user plane data information to the user plane of the Remote UE by the user plane of the Relay UE; when the Relay UE has user plane data to be transmitted to the base station, transmitting the user plane data information to the user plane of the Relay UE, and then sending the user plane data information to the base station by the Relay UE; and the control plane data transmission between the Remote UE and the base station is directly transmitted through the control plane of the Remote UE and the base station.
However, mutual motion exists between the Remote UE and all the UEs that can be detected, so the network environment around the Remote UE is also complicated, and in the existing CU separation scenario, when the Relay UE currently connected to the Remote UE cannot maintain the Relay capability, there is no specific scheme for how to select the Relay UE for the Remote UE.
In the embodiment of the invention, when Relay UE is selected for the Relay UE, a plurality of performance parameters in the performance information of the candidate Relay UE are taken into consideration, and various performance parameters of the candidate Relay UE are comprehensively considered, so that the Relay UE can be stably provided with Relay service for the Relay UE.
Wherein, the performance information for selecting Relay UE for Remote UE includes but is not limited to part or all of the following parameters:
the residual energy of the candidate Relay UE, the load of the candidate Relay UE, the first channel quality between the user plane of the candidate Relay UE and the user plane of the Remote UE, the third channel quality between the candidate Relay UE and the base station, and the ID of the cell to which the candidate Relay UE belongs.
Wherein, the candidate Relay UEs may be all UEs that can be detected by the Remote UE; or preliminary screening may be performed before selecting a target Relay UE for the Remote UE.
The first channel quality between the user plane of the candidate Relay UE and the user plane of the Remote UE refers to sidelink channel quality between the user plane of the candidate Relay UE and the user plane of the Remote UE, and the third channel quality between the candidate Relay UE and the base station refers to Uulink channel quality between the candidate Relay UE and the base station.
Residual energy of candidate Relay 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 candidate Relay 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 the user plane of the candidate Relay UE and the user plane of the Remote UE: when Relay UE is selected for Remote UE, if the sidelink channel quality between the user plane of the Relay UE selected for the Remote UE and the user plane of the Remote UE cannot satisfy the set condition, Relay service cannot be provided for the Remote UE, that is, data transmission cannot be performed.
Uulink channel quality between candidate Relay 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.
And when the selected Relay UE and the Remote UE belong to the same cell, the selected Relay UE can more stably provide the Relay service for the Remote 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 system for reselecting a Relay UE, where the system includes:
a base station 100 connected to a user plane of a Remote UE through a source Relay UE; reselection information is then determined, wherein the reselection information includes some or all of: first channel quality between a user plane of source Relay UE and a user plane of Remote UE, second channel quality between a base station and a control plane of Remote UE, residual energy of the source Relay UE, load of the source Relay UE, and third channel quality between the source Relay UE and the base station; and finally, judging whether to carry out the reselection of the Relay UE aiming at the user plane of the Remote UE according to the reselection information.
The control plane of the Remote UE is connected with the base station; after the Relay UE needs to be reselected, determining information for selecting the target Relay UE according to the measurement parameters configured by the base station; reporting the information for selecting the target Relay UE to the base station so that the base station selects the target Relay UE; wherein the information for selecting the target Relay UE includes part or all of the following: the residual energy of the candidate Relay UE, the load of the candidate Relay UE, the first channel quality between the user plane of the candidate Relay UE and the user plane of the Remote UE, the third channel quality between the candidate Relay UE and the base station, and the ID of the cell to which the candidate Relay UE belongs.
In the method, when the base station is connected with the user plane of the Remote UE through the source Remote UE, the reselection information is confirmed, whether the Remote UE needs to be reselected aiming at the user plane of the Remote UE is determined according to the determined reselection information, the measurement parameters are configured to the Remote UE after the Relay UE needs to be reselected, then the parameters obtained by the measurement of the Remote UE determine the information for selecting the target Relay UE, the obtained information is further sent to the base station, and the base station selects the target Relay UE according to the information for selecting the target Relay UE uploaded by the control plane of the Remote UE. In the embodiment of the invention, the target Relay UE can be selected according to part or all of the measured information for selecting the target Relay UE, and compared with the prior art, the embodiment of the invention provides a scheme for reselecting the Relay UE for the Remote UE aiming at the CU separation scene, so that the communication capacity of the Remote UE is improved, and the system performance is improved.
Wherein the reselection information includes, but is not limited to, some or all of the following: the method comprises the steps of obtaining a first channel quality between a user plane of a source Relay UE and a user plane of a Remote UE, obtaining a second channel quality between a base station and a control plane of the Remote UE, obtaining residual energy of the source Relay UE, obtaining a load of the source Relay UE, and obtaining a third channel quality between the source Relay UE and the base station.
Remaining energy of source Relay UE: the remaining power of Relay UE currently connected to the Remote UE is referred to, and when the remaining power of the Relay UE is too low, the Relay capability cannot be maintained due to energy exhaustion, so that data transmission of the Remote UE via the Relay UE is interrupted.
Load of source Relay UE: the number of the UEs for which Relay service is provided by Relay UE currently connected to the Remote UE is referred to, and when the load of the Relay UE is too large, the Relay capability is lost due to overload, so that the Remote UE cannot perform data transmission through the currently connected Relay UE.
First channel quality between user plane of source Relay UE and user plane of Remote UE: the UE is configured to refer to a channel quality of a sidelink between a user plane of a Remote UE and a user plane of a source Relay UE, and when the channel quality of the sidelink between the Remote UE and the source Relay UE does not meet a set threshold, data transmission cannot be performed between the Remote UE and the source Relay UE.
Second channel quality between the base station and the control plane of the Remote UE: the UE control plane quality indicates the Uulink channel quality between the base station and the control plane of the Remote UE, and when the Uulink channel quality between the station and the control plane of the Remote UE is too low, data transmission cannot be performed between the base station and the control plane of the Remote UE.
Third channel quality between source Relay UE and base station: the channel quality of the uuink between the source Relay UE and the base station is referred, when the channel quality of the uuink between the source Relay UE and the base station connected with the Remote UE does not meet a set threshold value, data transmission cannot be carried out between the Relay UE and the base station, and therefore the Remote UE cannot carry out data transmission between the source Relay UE and the base station connected with the Remote UE.
The following describes embodiments of the present invention.
Firstly, the base station determines reselection information, and judges whether to perform reselection of Relay UE aiming at the user plane of the Remote UE according to the determined reselection information.
Wherein the reselection information includes, but is not limited to, some or all of the following: the UE comprises a sidelink channel quality between a user plane of a source Relay UE and a user plane of a Remote UE, a Uulink channel quality between a base station and a control plane of the Remote UE, residual energy of the source Relay UE, a load of the source Relay UE, and a Uulink channel quality between the source Relay UE and the base station.
In specific implementation, the base station determines whether to perform reselection of the Relay UE on the user plane of the Remote UE according to the determined reselection information. Because the reselection information may include various performance information of Relay UE connected to the Remote UE and quality of a channel connecting the control plane of the Remote UE and the base station, a data transmission environment of the Remote UE may be considered more comprehensively to improve a transmission rate of the Remote UE and continuity of a service.
When the base station determines reselection information, a source Relay UE currently connected to the Relay UE may report, to the base station, measured sidelink channel quality between a user plane of the source Relay UE and the user plane of the Relay UE, residual energy of the source Relay UE, a load of the source Relay UE, and Uulink channel quality between the source Relay UE and the base station, where the Uulink channel quality between the base station and a control plane of the Relay UE may be uploaded by the Relay UE or directly obtained by the base station.
After determining whether reselection information required for reselecting Relay UE is determined for the user plane of the Remote UE, it is first determined whether the channel quality between the control plane of the current Remote UE and the base station is sufficient to support transmission of control plane data between the current Remote UE and the base station according to the Uulink channel quality between the base station and the control plane of the Remote UE.
Specifically, the base station judges whether the quality of a uuink channel between the base station and a control plane of the Remote UE is greater than a set threshold, and if so, further judges to reselect the Relay UE for the user plane of the Remote UE; and otherwise, triggering cell switching and Relay UE reselection aiming at the Remote UE.
For example:
1. the threshold value of the Uulink channel quality between the base station and the control plane of the Remote UE, which is set by the base station, is 20, and when the Uulink channel quality between the base station and the control plane of the Remote UE is determined to be 21, the Uulink channel quality between the base station and the control plane of the Remote UE is greater than the Uulink channel quality threshold value between the base station and the control plane of the Remote UE, so that the relay UE is further judged to be reselected for the user plane of the Remote UE according to other parameters in the reselection information.
2. The threshold value of the Uulink channel quality between the base station and the control plane of the Remote UE, which is set by the base station, is 20, and when the Uulink channel quality between the base station and the control plane of the Remote UE is determined to be 16, the cell switching and the reselection of the Remote UE are triggered because the Uulink channel quality between the base station and the control plane of the Remote UE is smaller than the Uulink channel quality threshold value between the base station and the control plane of the Remote UE.
Firstly, the base station determines that inter-cell switching and Relay UE reselection are needed according to the quality of a Uulink channel between the base station and a control plane of the Relay UE.
In specific implementation, when it is determined that inter-cell handover and Relay UE reselection are required for the Relay UE, the base station performs link handover measurement configuration on the Relay UE and the Relay UE, and the Relay UE measure related parameters according to the received measurement configuration sent by the base station.
Optionally, the control plane of the Remote UE receives the measurement parameter configured by the base station through an RRC connection reconfiguration message, and then the Remote UE determines information for selecting the target Relay UE according to the measurement parameter configured by the serving base station.
The measurement parameters configured by the base station include id of a neighboring cell base station measured by the Remote UE, uuink link quality between a control plane of the Remote UE and the neighboring cell base station, id of a candidate Relay UE, sildelink link quality between the candidate Relay UE and a user plane of the Remote UE, cell id of the candidate Relay UE, uuink link quality between the candidate Relay UE and the base station, residual power of the Relay UE, and load of the Relay UE.
After determining relevant parameters for cell switching and Relay UE reselection, the base station first determines a target cell for cell switching of the Relay UE according to id of a neighboring cell base station measured by the Relay UE, and link quality of a control plane of the Relay UE and a neighboring cell base station Uulink. And then selecting target Relay UE of the Relay UE according to the determined parameters such as the id of the candidate Relay UE, the Sidelink link quality between the user plane of the Relay UE and the user plane of the candidate Relay UE, the cell id of the candidate Relay UE, the Uulink link quality between the candidate Relay UE and the base station, the residual electric quantity of the Relay UE, the load of the Relay UE and the like.
In specific implementation, when a target cell for cell handover of a Remote UE is selected, the base station may compare link qualities of all control planes of the Remote UE and adjacent cell base stations Uulink with a set threshold, determine an adjacent cell base station meeting requirements, and then randomly select one adjacent cell base station meeting the requirements from the adjacent cell base stations meeting the requirements as the target cell of the Remote UE;
and the base station compares the control surfaces of all the Remote UE with the link quality of the adjacent cell base station Uulink, and selects the adjacent cell base station with the best link quality of the control surface of the Remote UE and the adjacent cell base station Uulink as a target cell of the Remote UE.
After the target cell of the Remote UE, the base station will also select a target Relay UE for the Remote UE.
In the embodiment of the invention, two methods for selecting target Relay UE for the Remote UE are provided, wherein one method is to directly process all candidate UE parameters which can be detected by the Remote UE and select the target Relay UE; the other method is that all UE which can be detected by Remote UE is primarily screened, and target Relay UE is selected from screened candidate Relay UE.
The first method is as follows: and processing all the parameters of the UE which can be detected by the Remote UE to obtain a priority factor, and selecting the target Relay UE according to the obtained priority factor.
Firstly, for any candidate Relay UE, the base station determines the priority factor of the candidate Relay UE according to the information corresponding to the candidate Relay UE in the information for selecting the target Relay UE and the preset weight.
In specific implementation, the base station determines the priority factors of the candidate Relay UEs according to the information corresponding to the candidate Relay UEs in the information for selecting the target Relay UEs and preset weights, and then determines the target Relay UEs of the Remote UEs according to the determined priority factors of all the candidate Relay UEs.
When determining the priority factors of the candidate Relay UEs, firstly, for any one candidate Relay UE, the base station normalizes each parameter corresponding to the candidate Relay UE in the information for selecting the target Relay UE.
For example:
1. remote UE can detect only 2 candidate Relay UEs, UE1 and UE2, and the measurements result in:
the remaining energy of the UE1 is 50% power, the load of the UE1 is 2, the sidelink channel quality between the user plane of the UE1 and the user plane of the Remote UE is 24, and the Uulink channel quality between the UE1 and the base station is 16; and the ID of the cell to which UE1 belongs is the same as the ID of the cell to which Remote UE belongs, then it is determined that:
the UE1 residual energy normalization value is: 0.5/50% ÷ 100%;
the load normalization value of UE1 is: 2 ÷ (2+3) ═ 0.4;
the sidelink channel quality normalization between the user plane of UE1 and the user plane of Remote UE is: 24 ÷ 32 ═ 0.75;
the Uulink channel quality normalization value between the UE1 and the base station is: 16 ÷ 32 ═ 0.5;
the ID normalization value of the cell to which UE1 belongs is: 1.
2. the remaining energy of the UE2 is 70% power, the load of the UE2 is 3, the sidelink channel quality between the user plane of the UE2 and the user plane of the Remote UE is 20, and the Uulink channel quality between the UE2 and the base station is 20; and the ID of the cell to which UE2 belongs is the same as the ID of the cell to which the Remote UE belongs.
The remaining energy normalization value of the UE2 is determined as: 70% ÷ 100% ═ 0.7;
the load normalization value of UE2 is: 0.6/3 (2+ 3);
the sidelink channel quality normalization between the user plane of UE2 and the user plane of Remote UE is: 20 ÷ 32 ═ 0.625;
the Uulink channel quality normalization value between the UE2 and the base station is: 20 ÷ 32 ═ 0.625;
the ID normalization value of the cell to which UE2 belongs is: 0.
and secondly, multiplying the normalized parameters by preset weights corresponding to the parameters by the base station to obtain priority factors of the parameters.
For example: determining a candidate Relay UE of the Remote UE as UE1, determining the normalized value of the residual energy of the UE1 as 0.5, and determining the corresponding weight as 0.3;
the UE1 has a load normalization value of 0.4 and a corresponding weight of 0.2;
the sidelink channel quality normalization value between the user plane of the UE1 and the user plane of the Remote UE is 0.75, and the corresponding weight is 0.3;
the Uulink channel quality normalization value between the UE1 and the base station is 0.5, and the corresponding weight is 0.1;
the ID normalization value of the cell to which the UE1 belongs is 1, and the corresponding weight is 0.1.
Then it is determined that the priority factor corresponding to the remaining energy of the UE1 is: 0.5 × 0.3 ═ 0.15;
the load of the UE1 corresponds to a priority factor of: 0.4 × 0.2 ═ 0.08;
the priority factor corresponding to sidelink channel quality between the user plane of UE1 and the user plane of Remote UE is: 0.75 × 0.3 ═ 0.225;
the priority factor corresponding to the Uulink channel quality between the UE1 and the base station is: 0.5 × 0.1 ═ 0.05;
the priority factor corresponding to the ID of the cell to which UE1 belongs is: 1 × 0.1 ═ 0.1.
And then, the base station adds the priority factors of each parameter corresponding to the candidate Relay UE to obtain the priority factors of the candidate Relay UE.
In specific implementation, the embodiment of the invention introduces a priority factor algorithm of a candidate Relay UE:
priority factor of candidate Relay UE i:
Prelay_i＝A×hsidelink_i+B×huulink_i+C×hbattery_i+D×hload_i+E×hcell_i；
wherein, Prelay_iA priority factor representing a Relay UE i as a candidate;
hsidelink_irepresenting a link quality normalization value of Sidelink between a user plane of Remote UE and a user plane of candidate Relay UE i, wherein A is a weight corresponding to the link quality of Sidelink;
huulink_irepresenting a link quality normalization value of a Uulink between a candidate Relay UE i and a base station, wherein B is a weight corresponding to the link quality of the Uulink;
hbattery_irepresenting a residual energy normalization value of a candidate Relay UE i, wherein C is a weight corresponding to the residual energy;
hload_irepresenting the load normalization value of the candidate Relay UE i, wherein D is the weight corresponding to the load;
hcell_iID normalization value of the cell of the Relay UE i representing the candidate, and E is the weight corresponding to the residual energyAnd (4) heavy.
The weighting weight related to the embodiment of the invention can be set according to the actual network condition and the service requirement of the Remote UE.
For example: determining a candidate Relay UE of the Remote UE as UE1, determining the normalized value of the residual energy of the UE1 as 0.5, and determining the corresponding weight as 0.3;
the UE1 has a load normalization value of 0.4 and a corresponding weight of 0.2;
the sidelink channel quality normalization value between the user plane of UE1 and the user plane of the candidate Relay UE i is 0.75, and the corresponding weight is 0.3;
the Uulink channel quality normalization value between the UE1 and the base station is 0.5, and the corresponding weight is 0.1;
the ID normalization value of the cell to which the UE1 belongs is 1, and the corresponding weight is 0.1.
Then the priority factor of the UE1 is determined to be:
Prelay_1＝A×hsidelink_1+B×huulink_1+C×hbattery_1+D×hload_1+E×hcell_1＝0.75×0.3+0.5×0.1+0.5×0.3+0.4×0..2+1×0.1＝0.605；
wherein, Prelay_1A priority factor represented as UE 1;
hsidelink_1representing a link quality normalization value of Sidelink between the user plane of the Remote UE and the user plane of the UE1, wherein A is a weight corresponding to the link quality of Sidelink;
huulink_1the link quality normalization value of the Uulink between the UE1 and the base station is represented, and B is the weight corresponding to the link quality of the Uulink;
hbattery_1representing the normalized value of the residual energy of the UE1, wherein C is the weight corresponding to the residual energy;
hload_1represents the normalized value of the UE1, D being the weight corresponding to the load;
hcell_1the ID normalization value indicating the cell to which the UE1 belongs, and E is a weight corresponding to the remaining energy.
The weighting weight related to the embodiment of the invention can be set according to the actual network condition and the service requirement of the Remote UE.
And finally, the base station selects candidate Relay UE corresponding to the maximum priority factor as target Relay UE.
In specific implementation, after determining priority factors of all candidate Relay UEs of the Remote UE, the base station takes the candidate Relay UE corresponding to the largest priority factor as the target Relay UE. Therefore, the selected target Relay UE is the candidate Relay UE with the best comprehensive performance in all the candidate Relay UEs, and the Relay service can be provided for the Remote UE more stably.
For example: the Remote UE has three candidate Relay UEs, namely UE1, UE2 and UE3, and determines that the priority factor of UE1 is 3, the priority factor of UE2 is 2 and the priority factor of UE3 is 4, then the base station takes UE3 as the target Relay UE of the Remote UE.
After the target Relay UE of the Remote UE is selected, the Remote UE establishes connection with the selected target Relay UE, and performs data transmission with the base station through the target Relay UE.
The second method comprises the following steps: all UE which can be detected by Remote UE is primarily screened, and target Relay UE is selected from screened candidate Relay UE.
Firstly, the base station determines the Relay UE meeting the requirements from all candidate Relay UEs, wherein the result of comparison between each piece of information corresponding to the Relay UE meeting the requirements in the information for selecting the target Relay UE and the corresponding threshold value meets the requirements, and then the target Relay UE is selected from the Relay UEs meeting the requirements.
For example: the residual energy threshold of candidate Relay UE set by the base station is 50% of electric quantity, the load threshold of the candidate Relay UE is 3 UEs, the sildelink channel quality threshold between the user plane of the Remote UE and the user plane of the candidate Relay UE is 20, and the Ullink channel quality threshold between the candidate Relay UE and the base station is 20; and the ID of the cell to which the candidate relayle UE belongs is the same as the ID of the cell to which the Remote UE belongs.
Then, the candidate Relay UE is the candidate Relay UE required by the composite only when the residual energy of the candidate Relay UE is greater than the set residual energy threshold, the load of the Relay UE is less than the set load threshold, the sidelink channel quality between the user plane of the Relay UE and the user plane of the Relay UE is greater than the set sidelink channel quality threshold, the uuink channel quality between the Relay UE and the base station is greater than the set uuink channel quality threshold, and the ID of the cell to which the Relay UE belongs is the same as the ID of the cell to which the Relay UE belongs.
If there are 5 candidate Relay UEs that can be detected by the Remote UE, these are Relay UE1, Relay UE2, Relay UE3, Relay UE4, and Relay UE5, and the measurement results are:
the remaining energy of Relay UE1 is 60% power, the load of Relay UE1 is 2, the sidelink channel quality between the user plane of Relay UE1 and the user plane of Remote UE is 24, and the Uulink channel quality between Relay UE1 and the base station is 22; and the ID of the cell to which Relay UE1 belongs is the same as the ID of the cell to which Remote UE belongs;
the remaining energy of Relay UE2 is 70% capacity, the load of Relay UE2 is 1, the first channel quality between the user plane of Relay UE2 and the user plane of Remote UE is 22, the second channel quality between Relay UE2 and the base station is 18; and the ID of the cell to which the Relay UE2 belongs is different from the ID of the cell to which the Remote UE belongs.
The remaining energy of Relay UE3 is 30% capacity, the load of Relay UE3 is 2, the sidelink channel quality between the user plane of Relay UE3 and the user plane of Remote UE is 16, and the Uulink channel quality between Relay UE3 and the base station is 22; and the ID of the cell to which Relay UE3 belongs is the same as the ID of the cell to which Remote UE belongs;
the residual energy of Relay UE4 is 45% electricity quantity, the load of Relay UE4 is 4, the sidelink channel quality between the user plane of Relay UE4 and the user plane of Remote UE is 25, and the Uulink channel quality between Relay UE4 and the base station is 23; and the ID of the cell to which Relay UE4 belongs is different from the ID of the cell to which Remote UE belongs;
the residual energy of Relay UE5 is 75% electricity, the load of Relay UE5 is 1, the sidelink channel quality between the user plane of Relay UE5 and the user plane of Remote UE is 22, and the Uulink channel quality between Relay UE5 and the base station is 24; and the ID of the cell to which the Relay UE5 belongs is the same as the ID of the cell to which the Remote UE belongs.
Then, as determined by the comparison, of the 5 detectable candidate Relay UEs of the Remote UE, only candidate Relay UE1 and candidate Relay UE5 satisfy the requirement.
After determining the candidate Relay UEs satisfying the requirements in all the candidate Relay UEs of the Remote UEs, the base station further selects one of the determined candidate Relay UEs as the target Relay UE of the Remote UE.
At this time, the target Relay UE that selects the Remote UE from the candidate Relay UEs that satisfy the requirement may be random, or may be selected according to a set rule. Due to different set selection rules, the selection modes can be diversified.
Two possible embodiments of selecting a target Relay UE for a Remote UE from candidate Relay UEs that meet the requirements will be given below.
The first embodiment is as follows: and selecting target Relay UE of the Relay UE according to the sidelink channel quality between the user plane of the candidate Relay UE and the user plane of the Relay UE which meets the requirement.
For example: comparing the sidelink channel quality between the user planes of all candidate Relay UEs meeting the requirements and the user plane of the Remote UE, and selecting the candidate Relay UE with the largest sidelink channel quality as the target Relay UE of the Remote UE.
Suppose that there are two candidate Relay UEs that satisfy the requirement of the Remote UE, which are Relay UE1 and Relay UE2, and are measured as follows:
the sidelink channel quality between the user plane of Relay UE1 and the user plane of Remote UE is 24, and the sidelink channel quality between the user plane of Relay UE2 and the user plane of Remote UE is 22. Because the sidelink channel quality between the user plane of Relay UE2 and the user plane of the Relay UE is less than the sidelink channel quality between the user plane of Relay UE1 and the user plane of the Relay UE, Relay UE1 is selected as the target Relay UE for the Relay UE.
Example two: and calculating priority factors of all candidate Relay UEs meeting the requirements, and taking the candidate Relay UE corresponding to the maximum priority factor as the target Relay UE of the Remote UE.
For example: setting the weight of the residual energy of the candidate Relay UE to be 0.3, the weight of the load of the candidate Relay UE to be 0.2, the weight of the sidelink channel quality between the user plane of the candidate Relay UE and the user plane of the Remote UE to be 0.3, the weight of the Uulink channel quality between the candidate Relay UE and the base station to be 0.1, and the weight of whether the candidate Relay UE and the Remote UE are in the same cell to be 0.1;
suppose that there are two candidate Relay UEs that satisfy the requirement of the Remote UE, which are Relay UE1 and Relay UE2, and are measured as follows:
the remaining energy of Relay UE1 is 60% power, the load of Relay UE1 is 2, the sidelink channel quality between the user plane of Relay UE1 and the user plane of Remote UE is 24, and the Uulink channel quality between Relay UE1 and the base station is 22; and the ID of the cell to which Relay UE1 belongs is the same as the ID of the cell to which Remote UE belongs;
the residual energy of Relay UE2 is 75% electricity, the load of Relay UE2 is 1, the sidelink channel quality between the user plane of Relay UE2 and the user plane of Remote UE is 22, and the Uulink channel quality between Relay UE2 and the base station is 24; and the ID of the cell to which the Relay UE2 belongs is the same as the ID of the cell to which the Remote UE belongs.
Then, according to the calculation formula of the priority factor of the candidate Relay UE i, it can be known that:
the priority factor of the candidate Relay UE1 is:
Prelay_1＝A×hsidelink_1+B×huulink_1+C×hbattery_1+D×hload_1+E×hcell_1＝24÷32×0.3+22÷32×0..2+0.6×0.3+0.5×0.1+1×0.1＝0.67375；
wherein, Prelay_1A priority factor represented as UE 1;
hsidelink_1representing a link quality normalization value of Sidelink between a user plane of Remote UE and a user plane of UE1, wherein A is a weight corresponding to the link quality of Sidelink;
huulink_1indicating the normalized value of the link quality between the UE1 and the base station Uulink, B is the link quality corresponding to the UulinkA weight;
hbattery_1representing the normalized value of the residual energy of the UE1, wherein C is the weight corresponding to the residual energy;
hload_1represents the normalized value of the UE1, D being the weight corresponding to the load;
hcell_1the ID normalization value indicating the cell to which the UE1 belongs, and E is a weight corresponding to the remaining energy.
The priority factor of the candidate Relay UE2 is:
Prelay_2＝A×hsidelink_2+B×huulink_2+C×hbattery_2+D×hload_2+E×hcell_2＝22÷32×0.3+24÷32×0.1+0.75×0.3+0.5×0.2+2×0.1＝0.71875；
wherein, Prelay_2A priority factor represented as UE 2;
hsidelink_2the link quality normalization value of Sidelink between UE2 between Remote UE is represented, and A is the weight corresponding to the link quality of Sidelink;
huulink_2the link quality normalization value of the Uulink between the UE2 and the base station is represented, and B is the weight corresponding to the link quality of the Uulink;
hbattery_2representing the normalized value of the residual energy of the UE2, wherein C is the weight corresponding to the residual energy;
hload_2represents the normalized value of the UE2, D being the weight corresponding to the load;
hcell_2the ID normalization value indicating the cell to which the UE2 belongs, and E is a weight corresponding to the remaining energy.
From the above calculation, it can be known that the priority factor of the candidate Relay UE2 is greater than that of the candidate Relay UE1, so the candidate Relay UE2 is selected as the target Relay UE of the Remote UE.
The weighting weight related to the embodiment of the invention can be set according to the actual network condition and the service requirement of the Remote UE.
After determining a target cell and target Relay UE of the Remote UE, the Remote UE performs cell switching, firstly realizes the connection of a control plane of the Remote UE with a base station, and realizes the connection of a user plane of the Remote UE with a user plane of the target Relay.
And secondly, the base station determines whether to perform reselection of the Relay UE aiming at the user plane of the Remote UE according to the determined reselection information except the Uulink channel quality between the base station and the control plane of the Remote UE.
In a specific implementation, the quality of the uuink channel between the base station and the control plane of the Remote UE is determined to be sufficient to support data transmission between the base station and the control plane of the Remote UE.
Specifically, there are various ways of determining whether to perform reselection of the Relay UE on the user plane of the Relay UE according to the sidelink channel quality between the user plane of the source Relay UE and the user plane of the Relay UE, the residual energy of the source Relay UE, the load of the source Relay UE, and the uuink channel quality between the source Relay UE and the base station, which will be described below one by one.
And in the triggering mode 1, the base station judges whether to reselect the Relay UE aiming at the Relay UE according to the residual energy of the source Relay UE.
In implementation, the base station judges whether the residual energy is greater than a residual energy threshold value, and if so, connects to the source Relay UE; otherwise, the Relay UE is reselected aiming at the Remote UE.
In the method, when the base station judges whether Relay UE is reselected for the Relay UE, if the base station judges that the residual energy is greater than the residual energy threshold, the base station determines that the residual energy of the source Relay UE is sufficient, and can stably provide service for the Relay UE, and the Relay UE is connected with the source Relay UE; otherwise, determining that the residual energy of the currently connected source Relay UE is too low to provide service for the Relay UE well, so that the Relay UE is reselected for the Relay UE. In the embodiment of the invention, when the residual energy of the source Relay UE is too low, the Relay UE is triggered to be reselected aiming at the Relay UE, so that the Relay UE can be connected with the reselected Relay UE in time, and the interruption of data transmission between the Relay UE and a base station caused by the energy exhaustion of the source Relay UE is avoided. The communication capability of Remote UE is improved, and the system performance is improved.
For example:
1. the residual energy threshold of source Relay UE of the Relay UE determined by the base station is 50% of electric quantity, and when the Relay UE determines that the residual energy of the source Relay UE is 35% of electric quantity, the Relay UE judges that the Relay UE reselects for the Relay UE because the residual energy of the source Relay UE is smaller than the residual energy threshold.
And 2, judging whether to reselect the Relay UE aiming at the Relay UE by the base station according to the load of the source Relay UE.
In implementation, the base station judges whether the load of the source Relay UE is smaller than a load threshold value, and if so, maintains the currently connected source Relay UE; otherwise, the Relay UE is reselected aiming at the Remote UE.
In the method, when the base station judges whether Relay UE is reselected for the Relay UE, if the base station judges that the load of the source Relay UE is smaller than a set load threshold, the base station determines that the residual energy of the source Relay UE is sufficient and can stably provide service for the Relay UE, and the Relay UE is connected with the source Relay UE; otherwise, determining that the residual energy of the currently connected source Relay UE is too low to provide service for the Relay UE well, and reselecting the Relay UE for the Relay UE. In the embodiment of the invention, when the residual energy of the source Relay UE is too low, the Relay UE is triggered to reselect the Relay UE, so that the Relay UE can be connected with the reselected Relay UE in time, and the interruption of data transmission between the Relay UE and the base station due to the energy exhaustion of the source Relay UE is avoided. The communication capability of Remote UE is improved, and the system performance is improved.
For example: the load threshold of source Relay UE connected with Remote UE determined by a base station is 4 UEs, the load of the source Relay UE connected with the Remote UE determined by the current Remote UE is 3 UEs, and the Remote UE determines that the load of the source Relay UE is smaller than the set load threshold, so that the Remote UE maintains the connected source Relay UE.
And 3, judging whether to reselect the Relay UE by the base station according to the quality of the Ullink channel between the source Relay UE and the base station.
In specific implementation, the base station judges whether the quality of a Uulink channel between source Relay UE connected with the Remote UE and the base station is greater than a set Uulink channel quality threshold, if so, the current connected source Relay UE is maintained; otherwise, the Relay UE is reselected aiming at the Remote UE.
In the method, when the base station judges whether to reselect the Relay UE for the Relay UE, if the base station judges that the quality of the Uulink channel between the source Relay UE and the base station is greater than the set Uulink channel quality threshold, the channel quality between the source Relay UE and the base station is determined to be good, data transmission can be stably carried out, and the Relay UE maintains the currently connected source Relay UE; otherwise, it is determined that the Uulink channel quality between the currently connected source Relay UE and the base station is poor and data transmission is not possible, that is, the source Relay UE cannot maintain Relay capability, so that the Relay UE is reselected for the Remote UE. Therefore, when the quality of the Ulink channel between the source Relay UE and the base station is poor and the Relay capability cannot be maintained, the base station can select the new Relay UE of the Remote UE and indicate the Remote UE to access, and the interruption of data transmission between the Remote UE and the base station due to the fact that the quality of the Ulink channel between the source Relay UE and the base station cannot realize data transmission is avoided.
For example: the quality of a Ullink channel between source Relay UE connected with Remote UE determined by a base station is 25, the quality threshold of the Ullink channel between the source Relay UE and the base station determined by the Remote UE at present is 20, and at this time, the Remote UE determines that the quality of the Ullink channel between the source Relay UE and the base station is less than the set quality threshold of the Ullink channel between the source Relay UE and the base station, so that the Remote UE is reselected for the Remote UE.
And 4, judging whether to reselect the Relay UE according to the residual energy of the Source Relay UE and the sidelink channel quality between the user plane of the Relay UE and the user plane of the Source Relay UE by the base station.
In implementation, the base station determines whether the residual energy of the source Relay UE is greater than a set residual energy threshold, and whether the sidelink channel quality between the user plane of the Remote UE and the user plane of the source Relay UE is greater than a set sidelink channel quality threshold, if so, the source Relay UE currently connected is maintained; otherwise, the reselection of the Relay UE is carried out aiming at the RemoteUE.
In the method, the currently connected source Relay UE is maintained only when the residual energy of the source Relay UE connected with the Relay UE and the sidelink channel quality between the user plane of the Relay UE and the user plane of the source Relay UE are both greater than the set threshold; otherwise, the Relay UE is reselected aiming at the Remote UE. Therefore, when the residual energy of the source Relay UE is too low or the sidelink channel quality between the user plane of the Relay UE and the user plane of the source Relay UE is too low, the base station selects new Relay UE and accesses the Relay UE in a standard manner, thereby avoiding the possibility of data transmission interruption between the Relay UE and the base station due to the fact that the source Relay UE cannot maintain the Relay capability, improving the communication capability of the Relay UE and improving the system performance.
For example: the base station determines that the quality threshold of a sidelink channel between the user plane of the Remote UE and the user plane E of the source Relay U is 25; the remaining energy threshold of the source Relay UE to which the Remote UE is currently connected is 50% of the electricity.
If the residual energy of source Relay UE currently connected by the Relay UE is 35% of electric quantity, and the sidelink channel quality between the user plane of the Relay UE and the user plane of the source Relay UE is 22, because the residual energy of the source Relay UE is smaller than a residual energy threshold value and the sidelink channel quality between the user plane of the Relay UE and the user plane of the source Relay UE is smaller than a sidelink channel quality threshold value, the Relay UE is reselected for the Relay UE.
And a triggering mode 5, judging whether to reselect the Relay UE according to the load of the source Relay UE and the sidelink channel quality between the user plane of the Relay UE and the user plane of the source Relay UE by the base station.
In specific implementation, the base station determines whether the load of the source Relay UE is smaller than a set load threshold, and whether the sidelink channel quality between the user plane of the Relay UE and the user plane of the source Relay UE is greater than the set sidelink channel quality threshold, and if so, maintains the currently connected source Relay UE; otherwise, the RelayUE is reselected aiming at the Remote UE.
In the method, only when the load of the source Relay UE is smaller than a set load threshold value and the sidelink channel quality between the user plane of the Relay UE and the user plane of the source Relay UE is larger than the set sidelink channel quality threshold value, the source Relay UE can maintain the Relay capability, and the Remote UE maintains the currently connected source Relay UE; otherwise, the Relay UE is reselected aiming at the Remote UE. This may make the communication between the Remote UE and the currently connected Relay UE more stable. Therefore, the communication capability of the Remote UE is improved, and the system performance is improved.
For example: the base station determines that the sildelink channel quality threshold between the user plane of the Remote UE and the user plane of the source Relay UE is 24; the load threshold for the source Relay UE is 4 UEs.
If the load of the source Relay UE is determined to be 3 UEs and the sidelink channel quality between the user plane of the Relay UE and the user plane of the source Relay UE is determined to be 26, the load of the source Relay UE is smaller than a load threshold value and the sidelink channel quality between the user plane of the Relay UE and the user plane of the source Relay UE is larger than a sidelink channel quality threshold value, so that the source Relay UE which is connected currently is maintained.
And 6, judging whether to reselect the Relay UE according to the quality of the Ullink channel between the source Relay UE and the base station and the quality of the sidelink channel between the user plane of the Relay UE and the user plane of the source Relay UE by the base station.
In specific implementation, the base station determines whether the quality of a Uulink channel between source Relay UE and the base station is greater than a set Uulink channel quality threshold, and whether the quality of a sidelink channel between a user plane of Remote UE and a user plane of source Relay UE is greater than a set sidelink channel quality threshold, if so, the currently connected source Relay UE is maintained; otherwise, the Relay UE is reselected aiming at the Remote UE.
In the method, only when the quality of a Uulink channel between source Relay UE and a base station is greater than a set Uulink channel quality threshold and the quality of a sidelink channel between a user plane of the Relay UE and the user plane of the source Relay UE is greater than a set sidelink channel quality threshold, the source Relay UE is determined to be capable of maintaining Relay capacity, and the Relay UE maintains the currently connected source Relay UE; otherwise, the Relay UE is reselected aiming at the Remote UE. This may make the communication between the RemoteUE and the currently connected Relay UE more stable. Therefore, the communication capability of the Remote UE is improved, and the system performance is improved.
For example: the base station determines that the sildelink channel quality threshold between the user plane of the Remote UE and the user plane of the source Relay UE is 24; the Uulink channel quality threshold between the source Relay UE and the base station is 20.
If the quality of the uuink channel between the source Relay UE and the base station is determined to be 19, and the quality of the sidelink channel between the user plane of the Relay UE and the user plane of the source Relay UE is determined to be 26, because the quality of the uuink channel between the source Relay UE and the base station is smaller than a threshold value of the uuink channel quality, the Relay UE is reselected for the Relay UE.
And a triggering mode 7, judging whether to reselect the Relay UE aiming at the Relay UE by the base station according to the residual energy of the Source Relay UE and the load of the Source Relay UE.
In specific implementation, the base station determines whether the residual energy of the source Relay UE is greater than a set source residual energy threshold and whether the load of the source Relay UE is less than a set load threshold, and if so, maintains the currently connected source Relay UE; otherwise, the Relay UE is reselected aiming at the Remote UE.
In the method, only when the residual energy of the source Relay UE is greater than the set source residual energy threshold and the load of the source Relay UE is greater than the set load threshold, the source Relay UE is determined to be capable of maintaining the Relay capability, and the Remote UE maintains the currently connected source Relay UE; otherwise, the Relay UE is reselected aiming at the Remote UE. Therefore, the RemoteUE can trigger and reselect the Relay UE in time under the condition that the residual energy of the source Relay UE is too low or the source Relay UE is overloaded, and the communication between the Remote UE and the Relay UE can be more stable. Therefore, the communication capability of the Remote UE is improved, and the system performance is improved.
For example: the residual energy threshold of the source Relay UE determined by the base station is 50% of electric quantity; the load threshold for the source Relay UE is 3 UEs.
If the residual energy of the source Relay UE is determined to be 70% of electric quantity and the load of the source Relay UE is 2 UEs, the source Relay UE currently connected with the Remote UE is maintained because the residual energy of the source Relay UE is greater than a residual energy threshold value and the load of the source Relay UE is greater than a load threshold value.
And the triggering mode 8 is that the base station judges whether to reselect the Relay UE according to the residual energy of the Source Relay UE and the Uulink channel quality between the Source Relay UE and the base station.
In specific implementation, the base station judges whether the residual energy of the source Relay UE is greater than a set source residual energy threshold value or not, and whether the quality of a Uulink channel between the source Relay UE and the base station is greater than a set Uulink channel quality threshold value or not, and if so, the currently connected source Relay UE is maintained; otherwise, the Relay UE is reselected aiming at the Remote UE.
In the method, only when the residual energy of the source Relay UE is greater than the set source residual energy threshold and the Uulink channel quality between the source Relay UE and the base station is greater than the set Uulink channel quality threshold, the source Relay UE is determined to be capable of maintaining the Relay capability, and the Remote UE maintains the currently connected source Relay UE; otherwise, the Relay UE is reselected aiming at the Remote UE. Therefore, the Relay UE can be triggered and reselected in time under the condition that the residual energy of the source Relay UE is too low or mutual data transmission cannot be carried out between the source Relay UE and the base station, and the communication between the Relay UE and the Relay UE can be more stable. Therefore, the communication capability of the Remote UE is improved, and the system performance is improved.
For example: the residual energy threshold of the source Relay UE determined by the base station is 50% of electric quantity; the Uulink channel quality threshold between the source Relay UE and the base station is 20.
If the residual energy of the source Relay UE is determined to be 70% of electric quantity and the Uulink channel quality between the source Relay UE and the base station is determined to be 19, the Relay UE is reselected aiming at the Relay UE because the Uulink channel quality between the source Relay UE and the base station is less than a Uulink channel quality threshold.
And 9, the base station judges whether to reselect the Relay UE aiming at the Remote UE according to the load of the source Relay UE and the quality of the Ullink channel between the source Relay UE and the base station.
In specific implementation, the base station determines whether the load of the source Relay UE is smaller than a set load threshold, and whether the quality of a Uulink channel between the source Relay UE and the base station is greater than the set Uulink channel quality threshold, if so, the currently connected source Relay UE is maintained; otherwise, the Relay UE is reselected aiming at the Remote UE.
In the method, only when the load of the source Relay UE is smaller than a set load threshold value and the Uulink channel quality between the source Relay UE and the base station is larger than a set Uulink channel quality threshold value, the source Relay UE is determined to be capable of maintaining the Relay capability, and the Remote UE maintains the currently connected source Relay UE; otherwise, the Relay UE is reselected aiming at the Remote UE. Therefore, the Relay UE can be triggered and reselected in time under the condition that the source Relay UE is overloaded or data transmission cannot be carried out between the source Relay UE and the base station, and the communication between the Relay UE and the Relay UE can be more stable. Therefore, the communication capability of the Remote UE is improved, and the system performance is improved.
For example: the load threshold value of source Relay UE determined by the base station is 3 UE; the Uulink channel quality threshold between the source Relay UE and the base station is 20.
If the load of the source Relay UE is determined to be 4 UEs and the Uulink channel quality between the source Relay UE and the base station is 19, the Relay UE is reselected for the Remote UE because the load of the source Relay UE is greater than a set load threshold and the Uulink channel quality between the source Relay UE and the base station is less than the Uulink channel quality threshold.
And the triggering mode 10 is that the base station judges whether to reselect the Relay UE for the Relay UE according to the residual energy of the source Relay UE, the load of the source Relay UE and the sidelink channel quality between the user plane of the Relay UE and the user plane of the source Relay UE.
In specific implementation, the base station determines whether the residual energy of the source Relay UE is greater than a set source residual energy threshold, whether the load of the source Relay UE is less than a set load threshold, and whether the quality of a sidelink channel between a user plane of the Relay UE and the user plane of the source Relay UE is greater than a set sidelink channel quality threshold, and if so, maintains the currently connected source Relay UE; otherwise, the Relay UE is reselected aiming at the Remote UE.
In the method, only when the residual energy of the source Relay UE is greater than a set source residual energy threshold, the load of the source Relay UE is greater than a set load threshold, and the quality of a sidelink channel between the user plane of the Relay UE and the user plane of the source Relay UE is greater than a set sidelink channel quality threshold, it is determined that the source Relay UE can maintain the Relay capability, and the Relay UE maintains the currently connected source Relay UE; otherwise, the Relay UE is reselected aiming at the Remote UE. Therefore, when the residual energy of the source Relay UE is too low, or the source Relay UE is overloaded, or the sidelink channel quality between the user plane of the Relay UE and the user plane of the source Relay UE is poor, the Relay UE is triggered to reselect in time, so that the communication between the Relay UE and the Relay UE is more stable. Therefore, the communication capability of the Remote UE is improved, and the system performance is improved.
For example: the residual energy threshold of the source Relay UE determined by the base station is 50% of electric quantity; the load threshold of the source Relay UE is 3 UEs; the sidelink channel quality threshold between the user plane of the Remote UE and the user plane of the source Relay UE is 24.
If the residual energy of the source Relay UE is determined to be 70% of electric quantity, the source Relay UE loads 2 UEs, and the sidelink channel quality between the user plane of the Relay UE and the user plane of the source Relay UE is 25, the source Relay UE currently connected with the Relay UE is maintained because the residual energy of the source Relay UE is greater than the residual energy threshold, the load of the source Relay UE is greater than the load threshold, and the sidelink channel quality between the user plane of the Relay UE and the user plane of the source Relay UE is greater than the set sidelink channel quality threshold.
And the triggering mode 11, the Remote UE judging whether to reselect the Remote UE according to the residual energy of the source Remote UE, the Uulink channel quality between the source Remote UE and the base station and the sidelink channel quality between the user plane of the Remote UE and the user plane of the source Remote UE.
In specific implementation, the base station determines whether the residual energy of the source Relay UE is greater than a set source residual energy threshold, whether the Uulink channel quality between the source Relay UE and the base station is greater than a set Uulink channel quality threshold, and whether the sidelink channel quality between the user plane of the Remote UE and the user plane of the source Relay UE is greater than a set sidelink channel quality threshold, and if so, maintains the currently connected source Relay UE; otherwise, the Relay UE is reselected aiming at the Remote UE.
In the method, only when the residual energy of the source Relay UE is greater than a set source residual energy threshold, the quality of a Uulink channel between the source Relay UE and the base station is greater than a set Uulink channel quality threshold, and whether the quality of a sidelink channel between the user plane of the Relay UE and the user plane of the source Relay UE is greater than a set sidelink channel quality threshold or not, it is determined that the source Relay UE can maintain the Relay capability, and the Relay UE maintains the currently connected source Relay UE; otherwise, the Relay UE is reselected aiming at the Remote UE. Therefore, the Relay UE is triggered to reselect under the condition that the residual energy of the Relay UE is too low, or the mutual data transmission between the source Relay UE and the base station cannot be carried out, or the data transmission between the Relay UE and the source Relay UE cannot be carried out, so that the communication between the Relay UE and the Relay UE is more stable. Therefore, the communication capability of the Remote UE is improved, and the system performance is improved.
For example: the residual energy threshold of the source Relay UE determined by the base station is 50% of electric quantity; the quality threshold of the Uulink channel between the source Relay UE and the base station is 20, and the quality threshold of the sidelink channel between the user plane of the Relay UE and the user plane of the source Relay UE is 15.
If the residual energy of the source Relay UE is determined to be 70% of electric quantity, the quality of a Uulink channel between the source Relay UE and the base station is 19, and the quality of a sidelink channel between the user plane of the Relay UE and the user plane of the source Relay UE is 24, the Relay UE is reselected for the Relay UE because the quality of the Uulink channel between the source Relay UE and the base station is less than a threshold value of the Uulink channel quality.
The triggering mode 12 and the Remote UE determine whether to reselect the Remote UE according to the load of the source Remote UE, the Uulink channel quality between the source Remote UE and the base station, and the sidelink channel quality between the user plane of the Remote UE and the user plane of the source Remote UE.
In specific implementation, the base station determines whether the load of the source Relay UE is less than a set load threshold, whether the Uulink channel quality between the source Relay UE and the base station is greater than a set Uulink channel quality threshold, and whether the sidelink channel quality between the user plane of the Remote UE and the user plane of the source Relay UE is greater than a set sidelink channel quality threshold, if so, the source Relay UE currently connected is maintained; otherwise, the Relay UE is reselected aiming at the Remote UE.
In the method, only when the load of the source Relay UE is smaller than a set load threshold, the quality of a Uulink channel between the source Relay UE and the base station is larger than a set Uulink channel quality threshold, and the quality of a sidelink channel between the user plane of the Remote UE and the user plane of the source Relay UE is larger than a set sidelink channel quality threshold, the source Relay UE is determined to be capable of maintaining the Relay capability, and the Remote UE maintains the currently connected source Relay UE; otherwise, the Relay UE is reselected aiming at the Remote UE. Therefore, the Relay UE can be triggered and reselected in time under the condition that the source Relay UE is overloaded, or data transmission cannot be carried out between the source Relay UE and the base station, or data transmission cannot be carried out between the Relay UE and the source Relay UE, so that the communication between the Relay UE and the Relay UE is more stable. Therefore, the communication capability of the Remote UE is improved, and the system performance is improved.
For example: the load threshold value of source Relay UE determined by the base station is 3 UE; the quality threshold of a Uulink channel between source Relay UE and a base station is 20; the sidelink channel quality threshold between the user plane of the Remote UE and the user plane of the source Relay UE is 24.
If the load of the source Relay UE is determined to be 4 UEs, the quality of a Uulink channel between the source Relay UE and the base station is 19, and the quality of a sidelink channel between the user plane of the Relay UE and the user plane of the source Relay UE is 25, because the load of the source Relay UE is greater than a set load threshold value, and the quality of the Uulink channel between the source Relay UE and the base station is less than the threshold value of the Uulink channel quality, the Relay UE is reselected for the Relay UE.
And a triggering mode 13, the Remote UE judging whether to reselect the Remote UE according to the residual energy of the source Relay UE, the load of the source Relay UE and the Uulink channel quality between the source Relay UE and the base station.
In specific implementation, the base station determines whether the residual energy of the source Relay UE is greater than a set source residual energy threshold, whether the load of the source Relay UE is less than a set load threshold, and whether the quality of the uuink channel between the source Relay UE and the base station is greater than a set uuink channel quality threshold, if so, the currently connected source Relay UE is maintained; otherwise, the Relay UE is reselected aiming at the Remote UE.
In specific implementation, only when the residual energy of the source Relay UE is greater than a set source residual energy threshold, the load of the source Relay UE is less than a set load threshold, and the quality of a Uulink channel between the source Relay UE and a base station is greater than a set Uulink channel quality threshold, it is determined that the source Relay UE can maintain the Relay capability, and the Remote UE maintains the currently connected source Relay UE; otherwise, the Relay UE is reselected aiming at the Remote UE. Therefore, the Relay UE can be triggered and reselected in time under the condition that the residual energy of the source Relay UE is too low, or the source Relay UE is overloaded, or data transmission cannot be carried out between the source Relay UE and the base station, so that the communication between the Relay UE and the Relay UE is more stable. Therefore, the communication capability of the Remote UE is improved, and the system performance is improved.
For example: the residual energy threshold of the source Relay UE determined by the base station is 50% of electric quantity; the load threshold of the source Relay UE is 3 UEs; the Uulink channel quality threshold between the source Relay UE and the base station is 20.
If the residual energy of the source Relay UE is determined to be 70% of electric quantity, the source Relay UE loads 2 UEs, and when the Ullink channel quality threshold between the source Relay UE and the base station is 22, the source Relay UE currently connected with the Remote UE is maintained because the residual energy of the source Relay UE is greater than the residual energy threshold, the load of the source Relay UE is greater than the load threshold, and the Ullink channel quality between the source Relay UE and the base station is greater than the set Ullink channel quality threshold.
And the triggering mode 14, the Remote UE, according to the residual energy of the source Relay UE, the load of the source Relay UE, the uuink channel quality between the source Relay UE and the base station, and the sidelink channel quality between the user plane of the Remote UE and the user plane of the source Relay UE, determines whether to reselect the Relay UE for the Remote UE.
In specific implementation, the base station determines whether the residual energy of the source Relay UE is greater than a set source residual energy threshold, and whether the load of the source Relay UE is less than a set load threshold, and whether the quality of the Uulink channel between the source Relay UE and the base station is greater than a set Uulink channel quality threshold, and the quality of the sidelink channel between the user plane of the Remote UE and the user plane of the source Relay UE is greater than a set sidelink channel quality threshold, and if so, maintains the currently connected source Relay UE; otherwise, the Relay UE is reselected aiming at the Remote UE.
In the method, only when the residual energy of the source Relay UE is greater than a set source residual energy threshold, the load of the source Relay UE is less than a set load threshold, the quality of a Uulink channel between the source Relay UE and the base station is greater than a set Uulink channel quality threshold, and the quality of a sidelink channel between the user plane of the Remote UE and the user plane of the source Relay UE is greater than a set sidelink channel quality threshold, it is determined that the source Relay UE can maintain the Relay capability, and the Remote UE maintains the currently connected source Relay UE; otherwise, the Relay UE is reselected aiming at the Remote UE. Therefore, the Relay UE can be triggered and reselected in time under the condition that the residual energy of the Relay UE is too low, or the source Relay UE is overloaded, or data transmission cannot be performed between the source Relay UE and the base station, or data transmission cannot be performed between the Relay UE and the source Relay UE, so that the communication between the Relay UE and the Relay UE is more stable. Therefore, the communication capability of the Remote UE is improved, and the system performance is improved.
For example: the residual energy threshold of the source Relay UE determined by the base station is 50% of electric quantity; the load threshold of the source Relay UE is 3 UEs; the quality threshold of a Uulink channel between source Relay UE and a base station is 20; the sidelink channel quality threshold between the user plane of the Remote UE and the user plane of the source Relay UE is 24.
If the residual energy of the source Relay UE is determined to be 70% of electric quantity, the source Relay UE loads 2 UEs, and the Uulink channel quality threshold between the source Relay UE and the base station is 22, the source Relay UE currently connected with the Relay UE is maintained because the residual energy of the source Relay UE is greater than the residual energy threshold, the load of the source Relay UE is less than the load threshold, the Uulink channel quality between the source Relay UE and the base station is greater than the set Uulink channel quality threshold, and the sidelink channel quality between the user plane of the Relay UE and the user plane of the source Relay UE is greater than the set sidelink channel quality threshold.
And the Remote UE judges whether Relay UE is reselected aiming at the Remote UE or not according to the reselection information, and if the fact that the Relay UE is reselected aiming at the user surface of the Remote UE is determined, the Remote UE reselects a UE as the target Relay UE of the Remote UE.
In the embodiment of the invention, two methods for selecting target Relay UE for the Remote UE are provided, wherein one method is to directly process all candidate UE parameters which can be detected by the Remote UE and select the target Relay UE; the other method is that all UE which can be detected by Remote UE is primarily screened, and target Relay UE is selected from screened candidate Relay UE.
The first method is as follows: and processing all the parameters of the UE which can be detected by the Remote UE to obtain a priority factor, and selecting the target Relay UE according to the obtained priority factor.
Step 200, aiming at any one candidate Relay UE, the base station determines the priority factor of the candidate Relay UE according to the information corresponding to the candidate Relay UE in the information for selecting the target Relay UE and the preset weight.
In specific implementation, the base station determines the priority factors of the candidate Relay UEs according to the information corresponding to the candidate Relay UEs in the information for selecting the target Relay UEs and preset weights, and then determines the target Relay UEs of the Remote UEs according to the determined priority factors of all the candidate Relay UEs.
When determining the priority factors of the candidate Relay UEs, firstly, aiming at any one candidate Relay UE, the base station normalizes each parameter corresponding to the candidate Relay UE in the information for selecting the target Relay UE;
for example:
1. remote UE can detect only 2 candidate Relay UEs, UE1 and UE2, and the measurements result in:
the remaining energy of the UE1 is 50% power, the load of the UE1 is 2, the sidelink channel quality between the user plane of the UE1 and the user plane of the Remote UE is 24, and the Uulink channel quality between the UE1 and the base station is 16; and the ID of the cell to which UE1 belongs is the same as the ID of the cell to which Remote UE belongs, then it is determined that:
the UE1 residual energy normalization value is: 0.5/50% ÷ 100%;
the load normalization value of UE1 is: 2 ÷ (2+3) ═ 0.4;
the sidelink channel quality normalization between the user plane of UE1 and the user plane of Remote UE is: 24 ÷ 32 ═ 0.75;
the Uulink channel quality normalization value between the UE1 and the base station is: 16 ÷ 32 ═ 0.5;
the ID normalization value of the cell to which UE1 belongs is: 1.
2. the remaining energy of the UE2 is 70% power, the load of the UE2 is 3, the sidelink channel quality between the user plane of the UE2 and the user plane of the Remote UE is 20, and the Uulink channel quality between the UE2 and the base station is 20; and the ID of the cell to which UE2 belongs is the same as the ID of the cell to which the Remote UE belongs.
The remaining energy normalization value of the UE2 is determined as: 70% ÷ 100% ═ 0.7;
the load normalization value of UE2 is: 0.6/3 (2+ 3);
the sidelink channel quality normalization between the user plane of UE2 and the user plane of Remote UE is: 20 ÷ 32 ═ 0.625;
the Uulink channel quality normalization value between the UE2 and the base station is: 20 ÷ 32 ═ 0.625;
the ID normalization value of the cell to which UE2 belongs is: 0.
and secondly, multiplying the normalized parameters by preset weights corresponding to the parameters by the base station to obtain priority factors of the parameters.
For example: determining a candidate Relay UE of the Remote UE as UE1, determining the normalized value of the residual energy of the UE1 as 0.5, and determining the corresponding weight as 0.3;
the UE1 has a load normalization value of 0.4 and a corresponding weight of 0.2;
the sidelink channel quality normalization value between the user plane of the UE1 and the user plane of the Remote UE is 0.75, and the corresponding weight is 0.3;
the Uulink channel quality normalization value between the UE1 and the base station is 0.5, and the corresponding weight is 0.1;
the ID normalization value of the cell to which the UE1 belongs is 1, and the corresponding weight is 0.1.
Then it is determined that the priority factor corresponding to the remaining energy of the UE1 is: 0.5 × 0.3 ═ 0.15;
the load of the UE1 corresponds to a priority factor of: 0.4 × 0.2 ═ 0.08;
the priority factor corresponding to sidelink channel quality between the user plane of UE1 and the user plane of Remote UE is: 0.75 × 0.3 ═ 0.225;
the priority factor corresponding to the Uulink channel quality between the UE1 and the base station is: 0.5 × 0.1 ═ 0.05;
the priority factor corresponding to the ID of the cell to which UE1 belongs is: 1 × 0.1 ═ 0.1.
And finally, the base station adds the priority factors of each parameter corresponding to the candidate Relay UE to obtain the priority factors of the candidate Relay UE.
In specific implementation, the embodiment of the invention introduces a priority factor algorithm of a candidate Relay UE:
priority factor of candidate Relay UE i:
Prelay_i＝A×hsidelink_i+B×huulink_i+C×hbattery_i+D×hload_i+E×hcell_i；
wherein, Prelay_iA priority factor representing a Relay UE i as a candidate;
hsidelink_irepresenting a link quality normalization value of Sidelink between a user plane of Remote UE and a user plane of candidate Relay UE i, wherein A is a weight corresponding to the link quality of Sidelink;
huulink_ibetween Relay UE i representing candidates and base stationThe link quality normalization value of the Uulink, and B is the weight corresponding to the link quality of the Uulink;
hbattery_irepresenting a residual energy normalization value of a candidate Relay UE i, wherein C is a weight corresponding to the residual energy;
hload_irepresenting the load normalization value of the candidate Relay UE i, wherein D is the weight corresponding to the load;
hcell_iand E is the weight corresponding to the residual energy.
The weighting weight related to the embodiment of the invention can be set according to the actual network condition and the service requirement of the Remote UE.
For example: determining a candidate Relay UE of the Remote UE as UE1, determining the normalized value of the residual energy of the UE1 as 0.5, and determining the corresponding weight as 0.3;
the UE1 has a load normalization value of 0.4 and a corresponding weight of 0.2;
the sidelink channel quality normalization value between the user plane of UE1 and the user plane of the candidate Relay UE i is 0.75, and the corresponding weight is 0.3;
the Uulink channel quality normalization value between the UE1 and the base station is 0.5, and the corresponding weight is 0.1;
the ID normalization value of the cell to which the UE1 belongs is 1, and the corresponding weight is 0.1.
Then the priority factor of the UE1 is determined to be:
Prelay_1＝A×hsidelink_1+B×huulink_1+C×hbattery_1+D×hload_1+E×hcell_1＝0.75×0.3+0.5×0.1+0.5×0.3+0.4×0..2+1×0.1＝0.605；
wherein, Prelay_1A priority factor represented as UE 1;
hsidelink_1representing a link quality normalization value of Sidelink between the user plane of the Remote UE and the user plane of the UE1, wherein A is a weight corresponding to the link quality of Sidelink;
huulink_1represents the link quality normalization value of the Uulink between the UE1 and the base station, and B is the weight corresponding to the link quality of the UulinkWeighing;
hbattery_1representing the normalized value of the residual energy of the UE1, wherein C is the weight corresponding to the residual energy;
hload_1represents the normalized value of the UE1, D being the weight corresponding to the load;
hcell_1the ID normalization value indicating the cell to which the UE1 belongs, and E is a weight corresponding to the remaining energy.
The weighting weight related to the embodiment of the invention can be set according to the actual network condition and the service requirement of the Remote UE.
Step 201, the base station selects candidate Relay UEs corresponding to the maximum priority factor as target Relay UEs.
In specific implementation, after determining priority factors of all candidate Relay UEs of the Remote UE, the base station takes the candidate Relay UE corresponding to the largest priority factor as the target Relay UE. Therefore, the selected target Relay UE is the candidate Relay UE with the best comprehensive performance in all the candidate Relay UEs, and the Relay service can be provided for the Remote UE more stably.
For example: the Remote UE has three candidate Relay UEs, namely UE1, UE2 and UE3, and determines that the priority factor of UE1 is 3, the priority factor of UE2 is 2 and the priority factor of UE3 is 4, then the base station takes UE3 as the target Relay UE of the Remote UE.
After the target Relay UE of the Remote UE is selected, the Remote UE establishes connection with the selected target Relay UE, and performs data transmission with the base station through the target Relay UE.
The second method comprises the following steps: all UE which can be detected by Remote UE is primarily screened, and target Relay UE is selected from screened candidate Relay UE.
Firstly, the base station determines the Relay UE meeting the requirements from all candidate Relay UEs, wherein the result of comparison between each piece of information corresponding to the Relay UE meeting the requirements in the information for selecting the target Relay UE and the corresponding threshold value meets the requirements, and then the target Relay UE is selected from the Relay UEs meeting the requirements.
For example: the residual energy threshold of the candidate Relay UE set by the base station is 50% of electric quantity, the load threshold of the candidate Relay UE is 3 UEs, the sidelink channel quality threshold between the Remote UE and the candidate Relay UE is 20, and the Ullink channel quality threshold between the candidate Relay UE and the base station is 20; and the ID of the cell of the candidate Relay UE is the same as the ID of the cell of the Remote UE.
Then, the candidate Relay UE is the candidate Relay UE required by the composite only when the residual energy of the candidate Relay UE is greater than the set residual energy threshold, the load of the Relay UE is less than the set load threshold, the sidelink channel quality between the user plane of the Relay UE and the user plane of the Relay UE is greater than the set sidelink channel quality threshold, the uuink channel quality between the Relay UE and the base station is greater than the set uuink channel quality threshold, and the ID of the cell to which the Relay UE belongs is the same as the ID of the cell to which the Relay UE belongs.
If there are 5 candidate Relay UEs that can be detected by the Remote UE, these are Relay UE1, Relay UE2, Relay UE3, Relay UE4, and Relay UE5, and the measurement results are:
the remaining energy of Relay UE1 is 60% power, the load of Relay UE1 is 2, the sidelink channel quality between the user plane of Relay UE1 and the user plane of Remote UE is 24, and the Uulink channel quality between Relay UE1 and the base station is 22; and the ID of the cell to which Relay UE1 belongs is the same as the ID of the cell to which Remote UE belongs;
the remaining energy of Relay UE2 is 70% capacity, the load of Relay UE2 is 1, the first channel quality between the user plane of Relay UE2 and the user plane of Remote UE is 22, the second channel quality between Relay UE2 and the base station is 18; and the ID of the cell to which the Relay UE2 belongs is different from the ID of the cell to which the Remote UE belongs.
The remaining energy of Relay UE3 is 30% capacity, the load of Relay UE3 is 2, the sidelink channel quality between the user plane of Relay UE3 and the user plane of Remote UE is 16, and the Uulink channel quality between Relay UE3 and the base station is 22; and the ID of the cell to which Relay UE3 belongs is the same as the ID of the cell to which Remote UE belongs;
the residual energy of Relay UE4 is 45% electricity quantity, the load of Relay UE4 is 4, the sidelink channel quality between the user plane of Relay UE4 and the user plane of Remote UE is 25, and the Uulink channel quality between Relay UE4 and the base station is 23; and the ID of the cell to which Relay UE4 belongs is different from the ID of the cell to which Remote UE belongs;
the residual energy of Relay UE5 is 75% electricity, the load of Relay UE5 is 1, the sidelink channel quality between the user plane of Relay UE5 and the user plane of Remote UE is 22, and the Uulink channel quality between Relay UE5 and the base station is 24; and the ID of the cell to which the Relay UE5 belongs is the same as the ID of the cell to which the Remote UE belongs.
Then, as determined by the comparison, of the 5 detectable candidate Relay UEs of the Remote UE, only candidate Relay UE1 and candidate Relay UE5 satisfy the requirement.
After determining the candidate Relay UEs satisfying the requirements in all the candidate Relay UEs of the Remote UEs, the base station further selects one of the determined candidate Relay UEs as the target Relay UE of the Remote UE.
At this time, the target Relay UE that selects the Remote UE from the candidate Relay UEs that satisfy the requirement may be random, or may be selected according to a set rule. Due to different set selection rules, the selection modes can be diversified.
Two possible embodiments of selecting a target Relay UE for a Remote UE from candidate Relay UEs that meet the requirements will be given below.
The first embodiment is as follows: and selecting target Relay UE of the Relay UE according to the sidelink channel quality between the user plane of the candidate Relay UE and the user plane of the Relay UE which meets the requirement.
For example: comparing the sidelink channel quality between the user planes of all candidate Relay UEs meeting the requirements and the user plane of the Remote UE, and selecting the candidate Relay UE with the largest sidelink channel quality as the target Relay UE of the Remote UE.
Suppose that there are two candidate Relay UEs that satisfy the requirement of the Remote UE, which are Relay UE1 and Relay UE2, and are measured as follows:
the sidelink channel quality between the user plane of Relay UE1 and the user plane of Remote UE is 24, and the sidelink channel quality between the user plane of Relay UE2 and the user plane of Remote UE is 22. Because the sidelink channel quality between the user plane of Relay UE2 and the user plane of the Relay UE is less than the sidelink channel quality between the user plane of Relay UE1 and the user plane of the Relay UE, Relay UE1 is selected as the target Relay UE for the Relay UE.
Example two: and calculating priority factors of all candidate Relay UEs meeting the requirements, and taking the candidate Relay UE corresponding to the maximum priority factor as the target Relay UE of the Remote UE.
For example: setting the weight of the residual energy of the candidate Relay UE to be 0.3, the weight of the load of the candidate Relay UE to be 0.2, the weight of the sidelink channel quality between the user plane of the candidate Relay UE and the user plane of the Remote UE to be 0.3, the weight of the Uulink channel quality between the candidate Relay UE and the base station to be 0.1, and the weight of whether the candidate Relay UE and the Remote UE are in the same cell to be 0.1;
suppose that there are two candidate Relay UEs that satisfy the requirement of the Remote UE, which are Relay UE1 and Relay UE2, and are measured as follows:
the remaining energy of Relay UE1 is 60% power, the load of Relay UE1 is 2, the sidelink channel quality between the user plane of Relay UE1 and the user plane of Remote UE is 24, and the Uulink channel quality between Relay UE1 and the base station is 22; and the ID of the cell to which Relay UE1 belongs is the same as the ID of the cell to which Remote UE belongs;
the residual energy of Relay UE2 is 75% electricity, the load of Relay UE2 is 1, the sidelink channel quality between the user plane of Relay UE2 and the user plane of Remote UE is 22, and the Uulink channel quality between Relay UE2 and the base station is 24; and the ID of the cell to which the Relay UE2 belongs is the same as the ID of the cell to which the Remote UE belongs.
Then, according to the calculation formula of the priority factor of the candidate Relay UE i, it can be known that:
the priority factor of the candidate Relay UE1 is:
Prelay_1＝A×hsidelink_1+B×huulink_1+C×hbattery_1+D×hload_1+E×hcell_1＝24÷32×0.3+22÷32×0..2+0.6×0.3+0.5×0.1+1×0.1＝0.67375；
wherein, Prelay_1A priority factor represented as UE 1;
hsidelink_1representing a link quality normalization value of Sidelink between a user plane of Remote UE and a user plane of UE1, wherein A is a weight corresponding to the link quality of Sidelink;
huulink_1the normalized value of the link quality of the UE1 and the base station Uulink is shown, and B is the weight corresponding to the link quality of the Uulink;
hbattery_1representing the normalized value of the residual energy of the UE1, wherein C is the weight corresponding to the residual energy;
hload_1represents the normalized value of the UE1, D being the weight corresponding to the load;
hcell_1the ID normalization value indicating the cell to which the UE1 belongs, and E is a weight corresponding to the remaining energy.
The priority factor of the candidate Relay UE2 is:
Prelay_2＝A×hsidelink_2+B×huulink_2+C×hbattery_2+D×hload_2+E×hcell_2＝22÷32×0.3+24÷32×0.1+0.75×0.3+0.5×0.2+2×0.1＝0.71875；
wherein, Prelay_2A priority factor represented as UE 2;
hsidelink_2the link quality normalization value of Sidelink between UE2 between Remote UE is represented, and A is the weight corresponding to the link quality of Sidelink;
huulink_2the link quality normalization value of the Uulink between the UE2 and the base station is represented, and B is the weight corresponding to the link quality of the Uulink;
hbattery_2representing the normalized value of the residual energy of the UE2, wherein C is the weight corresponding to the residual energy;
hload_2represents the normalized value of the UE2, D being the weight corresponding to the load;
hcell_2the ID normalization value indicating the cell to which the UE2 belongs, and E is a weight corresponding to the remaining energy.
From the above calculation, it can be known that the priority factor of the candidate Relay UE2 is greater than that of the candidate Relay UE1, so the candidate Relay UE2 is selected as the target Relay UE of the Remote UE.
The weighting weight related to the embodiment of the invention can be set according to the actual network condition and the service requirement of the Remote UE.
And after the target Relay UE of the Remote UE is determined, connecting the user plane of the Remote UE with the user plane of the target Relay.
Embodiments of the present invention will be described below with respect to timing diagrams.
In a first scenario, as shown in fig. 2, a Remote UE, a source Relay UE and a target Relay UE belong to the same eNB, and during a moving process of the Remote UE, a uuink channel quality between a base station and a control plane of the Remote UE continuously meets a control plane data transmission requirement, where a candidate Relay UE1 is used as the target Relay UE reselected by the Remote UE.
A flowchart of a method for reselecting a Relay UE according to an embodiment of the present invention is shown in fig. 3.
Step 300, control plane data transmission is carried out between a control plane of the Remote UE and a macro cell;
step 301, performing uplink/downlink data transmission between a user plane of a source Relay UE and a user plane of a Remote UE;
step 302, performing uplink/downlink data transmission between the source Relay UE and the small cell;
step 303, performing uplink/downlink data transmission between the small cell and the candidate Relay UE 1;
step 304, performing uplink/downlink data transmission between the small cell and the candidate Relay UEN;
305, the Remote UE acquires the sidelink channel quality between all candidate Relay UEs and the Remote UE;
step 306, the macro cell determines the measurement configuration;
step 307, the macro cell sends measurement control information to the Remote UE, wherein the measurement control information carries measurement parameters;
step 308, the Remote UE measures all parameters according to the measurement parameters configured by the macro cell;
step 309, the Remote UE feeds back a measurement report to the macro cell;
step 310, the macro cell determines the optimal Relay UE to execute the link switching of the user plane according to the Remote UE feedback measurement report;
step 311, the macro cell sends a user plane link switching request message to the small cell;
step 312, the small cell returns a user plane link switching response message to the macro cell;
step 313, the macro cell instructs the Remote UE to switch the uplink to the target Relay UE;
step 314, the Remote UE establishes a new user plane connection with a candidate Relay UE1 (target Relay UE);
step 315, the Remote UE sends an RRC reconfiguration complete message to the macro cell;
step 316, the Relay UE1 sends an RRC reconfiguration complete message to the small cell;
step 317, control plane data transmission is carried out between the Remote UE and the macro cell;
step 318, Relay UE1 transmits uplink/downlink data of user plane to the small cell;
step 319, user plane uplink data transmission is performed between the Remote UE and the Relay UE 1.
Wherein the necessary timing relationship does not exist between steps 300-304, steps 315-316, and steps 317-318.
In a second scenario, as shown in fig. 4, a source Relay UE and a target Relay UE belong to different enbs, during the moving process of the Relay UE, the quality of the Uulin channel between the base station and the control plane of the Relay UE is reduced, and the requirement for control plane data transmission cannot be continuously met, and the Relay UE performs cell handover, where the candidate Relay UE1 is used as the target Relay UE reselected by the Relay UE.
A flowchart of a method for reselecting a Relay UE according to an embodiment of the present invention is shown in fig. 5.
500, performing control plane data transmission between a control plane of the Remote UE and a macro cell;
step 501, performing uplink/downlink data transmission between a user plane of source Relay UE and a user plane of Remote UE;
step 502, performing uplink/downlink data transmission between the source Relay UE and the source small cell;
step 503, performing uplink/downlink data transmission between the small cell 1 and the Relay UE 1;
step 504, the Remote UE obtains the quality of the Uulink channel between its own control plane and the macro cell 1;
step 505, the Remote UE acquires the sidelink channel quality between itself and Relay UE 1;
step 506, the source macro cell determines the measurement configuration;
step 507, the source macro cell sends measurement control information to the Remote UE, wherein the measurement control information carries measurement parameters;
step 508, the Remote UE measures each parameter according to the measurement parameter configured by the source macro cell;
step 509, the Remote UE feeds back a measurement report to the source macro cell;
step 510, the source macro cell selects a control plane link of an adjacent cell according to a Remote UE feedback measurement report, and the optimal Relay UE executes link switching of a user plane;
step 511, the source macro cell sends a control plane link switching request message to the macro cell 1;
step 512, the macro cell 1 returns a response message of the control plane link switching request to the source macro cell;
step 513, the new control plane link between the macro cell 1 and the Remote UE is established;
step 511, the macro cell 1 sends a user link switching request message to the small cell 1;
step 512, the small cell 1 returns a response message of the user plane link switching request to the macro cell 1;
step 515, the macro cell instructs the Remote UE to switch the uplink to the target Relay UE;
step 514, establishing a new control plane link between the macro cell 1 and the Remote UE;
step 515, the Remote UE sends an RRC reconfiguration complete message to the macro cell;
step 516, the Relay UE1 sends an RRC reconfiguration complete message to the small cell;
step 517, control plane data transmission is carried out between the Remote UE and the macro cell;
step 518, Relay UE1 performs user plane uplink/downlink data transmission to the small cell;
step 519, user plane uplink data transmission is carried out between the Remote UE and the Relay UE 1.
Wherein there is no necessary timing relationship between steps 500-503, 518-519, and 520-522.
As shown in fig. 6, an embodiment of the present invention provides a complete flowchart of a method for reselecting a Relay UE.
Step 600, a control plane of a base station and a Remote UE is connected through a Uulink link, and a user plane of the Remote UE and a user plane of a source Relay UE are connected through a sidelink link;
601, the base station judges whether the quality of the Uulink channel between the base station and the control plane of the Remote UE meets the requirement, if so, 602 is executed; otherwise, 605 is executed;
step 602, the base station judges whether to perform Relay UE reselection aiming at the Remote UE; if yes, go to step 605, otherwise go to step 600;
step 603, the base station determines to perform cell switching for the control plane of the Remote UE and perform Relay UE reselection for the user plane of the Remote UE;
step 604, the base station selects a target neighbor cell for cell switching of the Remote UE according to a plurality of neighbor cell IDs measured by the Remote UE and the Uulink channel quality between the corresponding neighbor cell and the control plane of the Remote UE;
step 605, the base station selects target Relay UE according to the information for selecting the target Relay UE measured by the Remote UE;
step 606, the control plane of the Remote UE establishes a Uulink link connection with the target cell;
step 607, the user plane of the Remote UE establishes sidelink link connection with the target Relay UE;
step 608, the control plane and the neighboring cell of the Remote UE perform data transmission through the Uulink, and the user plane of the Remote UE and the user plane of the source Relay UE perform data transmission through the sidelink link.
Based on the same inventive concept, the embodiment of the present invention further provides a method for reselecting Relay UE, because the Remote UE and the serving base station of the Remote UE in the method are the serving base stations of the Remote UE and the Remote UE in the system in the embodiment of the present invention, and the principle of the method for solving the problem is similar to that of the system, the implementation of the method may refer to the implementation of the system, and the repeated parts are not repeated.
As shown in fig. 7, an embodiment of the present invention provides a method for reselecting a Relay UE, where the method includes:
step 700, when the base station is connected with the user plane of the Remote UE through the source Relay UE; determining reselection information, wherein the reselection information comprises some or all of: first channel quality between a user plane of source Relay UE and a user plane of Remote UE, second channel quality between a base station and a control plane of Remote UE, residual energy of the source Relay UE, load of the source Relay UE, and third channel quality between the source Relay UE and the base station;
and 701, the base station judges whether to reselect Relay UE for the user plane of the Remote UE according to the reselection information.
Optionally, after the base station determines whether to perform reselection of Relay UE on the user plane of the Remote UE according to the reselection information, the method further includes:
the base station configures measurement parameters to the Remote UE after determining that the Relay UE needs to be reselected aiming at the user plane of the Remote UE;
the base station selects target Relay UE according to the information for selecting the target Relay UE reported by the control plane of the Remote UE;
wherein the information for selecting the target Relay UE includes part or all of the following:
the residual energy of the candidate Relay UE, the load of the candidate Relay UE, the first channel quality between the user plane of the candidate Relay UE and the user plane of the Remote UE, the third channel quality between the candidate Relay UE and the base station, and the ID of the cell to which the candidate Relay UE belongs.
Optionally, the selecting, by the base station, the target Relay UE according to the information for selecting the target Relay UE, which is reported by the control plane of the Remote UE, includes:
for any candidate Relay UE, the base station determines the priority factor of the candidate Relay UE according to the information corresponding to the candidate Relay UE in the information for selecting the target Relay UE and the preset weight;
and the base station selects candidate Relay UE corresponding to the maximum priority factor as target Relay UE.
Optionally, the selecting, by the base station, the target Relay UE according to the information for selecting the target Relay UE, which is reported by the control plane of the Remote UE, includes:
the base station determines Relay UE meeting requirements from all candidate Relay UEs, wherein each piece of information corresponding to the Relay UE meeting the requirements in the information for selecting the target Relay UE meets the requirements after being compared with a corresponding threshold;
and the base station selects target Relay UE from the Relay UE which meets the requirement.
As shown in fig. 8, an embodiment of the present invention provides a method for reselecting a Relay UE, where the method includes:
step 800, when a control plane of a Remote UE is connected with a base station; after the Remote UE needs to reselect the Relay UE, determining information for selecting the target Relay UE according to the measurement parameters configured by the base station;
step 801, the control plane of the Remote UE reports the information for selecting the target Relay UE to the base station, so that the base station selects the target Relay UE;
wherein the information for selecting the target Relay UE includes part or all of the following:
the residual energy of the candidate Relay UE, the load of the candidate Relay UE, the first channel quality between the user plane of the candidate Relay UE and the user plane of the Remote UE, the third channel quality between the candidate Relay UE and the base station, and the ID of the cell to which the candidate Relay UE belongs.
Optionally, before the Remote UE determines information for selecting the target Relay UE according to the measurement parameter configured by the base station, the method further includes:
and the control plane of the Remote UE receives the measurement parameters configured by the base station through an RRC connection reconfiguration message.
As shown in fig. 9, an embodiment of the present invention provides a base station for reselecting a Relay UE, where the base station includes:
at least one processor 900 and at least one memory 901, wherein the memory stores program code that, when executed by the processor, causes the processor to perform the following:
connecting with a user plane of a Remote UE through a source Relay UE; determining reselection information, wherein the reselection information comprises some or all of: first channel quality between a user plane of source Relay UE and a user plane of Remote UE, second channel quality between a base station and a control plane of Remote UE, residual energy of the source Relay UE, load of the source Relay UE, and third channel quality between the source Relay UE and the base station; and judging whether to reselect the Relay UE aiming at the user plane of the RemoteUE or not according to the reselection information.
Optionally, the processor 900 is further configured to:
after judging whether Relay UE reselection is carried out on the user plane of the Remote UE or not according to the reselection information and determining that the Relay UE reselection needs to be carried out on the user plane of the Remote UE, configuring measurement parameters to the Remote UE; selecting target Relay UE according to the information for selecting the target Relay UE reported by the control plane of the Remote UE;
wherein the information for selecting the target Relay UE includes part or all of the following:
the residual energy of the candidate Relay UE, the load of the candidate Relay UE, the first channel quality between the user plane of the candidate Relay UE and the user plane of the Remote UE, the third channel quality between the candidate Relay UE and the base station, and the ID of the cell to which the candidate Relay UE belongs.
Optionally, the processor 900 is specifically configured to:
for any candidate Relay UE, determining a priority factor of the candidate Relay UE according to information corresponding to the candidate Relay UE in the information for selecting the target Relay UE and a preset weight; and selecting the candidate Relay UE corresponding to the maximum priority factor as the target Relay UE.
Optionally, the processor 900 is specifically configured to:
determining Relay UE meeting requirements from all candidate Relay UEs, wherein each piece of information corresponding to the Relay UE meeting the requirements in the information for selecting the target Relay UE meets the requirements after being compared with a corresponding threshold; and selecting target Relay UE from the Relay UEs meeting the requirements.
As shown in fig. 10, an embodiment of the present invention provides a Remote UE for reselecting a Relay UE, where the Remote UE includes:
at least one processor 1000 and at least one memory 1001, wherein said memory stores program code which, when executed by said processor, causes said processor to perform the following:
when the control plane of the Remote UE is connected with the base station; after the Relay UE needs to be reselected, determining information for selecting the target Relay UE according to the measurement parameters configured by the base station; reporting the information for selecting the target Relay UE to the base station so that the base station selects the target Relay UE;
wherein the information for selecting the target Relay UE includes part or all of the following:
the residual energy of the candidate Relay UE, the load of the candidate Relay UE, the first channel quality between the user plane of the candidate Relay UE and the user plane of the Remote UE, the third channel quality between the candidate Relay UE and the base station, and the ID of the cell to which the candidate Relay UE belongs.
Optionally, the processor 1000 is further configured to:
before determining the information for selecting the target Relay UE according to the measurement parameters configured by the base station, receiving the measurement parameters configured by the base station through an RRC connection reconfiguration message.
As shown in fig. 11, an embodiment of the present invention provides a base station for reselecting a Relay UE, where the base station includes:
a determining module 1100, configured to connect with a user plane of a Remote UE through a source Relay UE; determining reselection information, wherein the reselection information comprises some or all of: first channel quality between a user plane of source Relay UE and a user plane of Remote UE, second channel quality between a base station and a control plane of Remote UE, residual energy of the source Relay UE, load of the source Relay UE, and third channel quality between the source Relay UE and the base station;
a determining module 1101, configured to determine whether to perform reselection of Relay UE on a user plane of the Remote UE according to the reselection information.
Optionally, the determining module 1101 is further configured to:
after judging whether Relay UE reselection is carried out on the user plane of the Remote UE or not according to the reselection information and determining that the Relay UE reselection needs to be carried out on the user plane of the Remote UE, configuring measurement parameters to the Remote UE;
selecting target Relay UE according to the information for selecting the target Relay UE reported by the control plane of the Remote UE;
wherein the information for selecting the target Relay UE includes part or all of the following:
the residual energy of the candidate Relay UE, the load of the candidate Relay UE, the first channel quality between the user plane of the candidate Relay UE and the user plane of the Remote UE, the third channel quality between the candidate Relay UE and the base station, and the ID of the cell to which the candidate Relay UE belongs.
Optionally, the determining module 1101 is specifically configured to:
for any candidate Relay UE, determining a priority factor of the candidate Relay UE according to information corresponding to the candidate Relay UE in the information for selecting the target Relay UE and a preset weight;
and selecting the candidate Relay UE corresponding to the maximum priority factor as the target Relay UE.
Optionally, the determining module 1101 is specifically configured to:
determining Relay UE meeting requirements from all candidate Relay UEs, wherein each piece of information corresponding to the Relay UE meeting the requirements in the information for selecting the target Relay UE meets the requirements after being compared with a corresponding threshold;
and selecting target Relay UE from the Relay UEs meeting the requirements.
As shown in fig. 12, an embodiment of the present invention provides a Remote UE for reselecting a Relay UE, where the Remote UE includes:
a determining module 1200, configured to when a control plane of a Remote UE is connected to a base station; after the Relay UE needs to be reselected, determining information for selecting the target Relay UE according to the measurement parameters configured by the base station;
an information reporting module 1201, configured to report the information for selecting the target Relay UE to the base station, so that the base station selects the target Relay UE;
wherein the information for selecting the target Relay UE includes part or all of the following:
the residual energy of the candidate Relay UE, the load of the candidate Relay UE, the first channel quality between the user plane of the candidate Relay UE and the user plane of the Remote UE, the third channel quality between the candidate Relay UE and the base station, and the ID of the cell to which the candidate Relay UE belongs.
Optionally, the determining module 1200 is further configured to:
before determining the information for selecting the target Relay UE according to the measurement parameters configured by the base station, receiving the measurement parameters configured by the base station through an RRC connection reconfiguration message.
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 (14)

1. A method for reselecting a Relay terminal (Relay UE), the method comprising:
the base station is connected with the user plane of the Remote terminal Remote UE through the source Relay UE;
the base station determines reselection information, wherein the reselection information comprises part or all of the following: first channel quality between a user plane of source Relay UE and a user plane of Remote UE, second channel quality between a base station and a control plane of Remote UE, residual energy of the source Relay UE, load of the source Relay UE, and third channel quality between the source Relay UE and the base station;
and the base station judges whether to reselect the Relay UE aiming at the user plane of the Relay UE according to the reselection information.
2. The method of claim 1, wherein after the base station determines whether to perform reselection of a Relay UE for the user plane of the Remote UE according to the reselection information, the method further comprises:
the base station configures measurement parameters to the Remote UE after determining that the Relay UE needs to be reselected aiming at the user plane of the Remote UE;
the base station selects target Relay UE according to the information for selecting the target Relay UE reported by the control plane of the Remote UE;
wherein the information for selecting the target Relay UE includes part or all of the following:
the residual energy of the candidate Relay UE, the load of the candidate Relay UE, the first channel quality between the user plane of the candidate Relay UE and the user plane of the Remote UE, the third channel quality between the candidate Relay UE and the base station, and the ID of the cell to which the candidate Relay UE belongs.
3. The method of claim 2, wherein the selecting, by the base station, the target Relay UE according to the information for selecting the target Relay UE reported by the control plane of the Remote UE comprises:
for any candidate Relay UE, the base station determines the priority factor of the candidate Relay UE according to the information corresponding to the candidate Relay UE in the information for selecting the target Relay UE and the preset weight;
and the base station selects candidate Relay UE corresponding to the maximum priority factor as target Relay UE.
4. The method of claim 2, wherein the selecting, by the base station, the target Relay UE according to the information for selecting the target Relay UE reported by the control plane of the Remote UE comprises:
the base station determines Relay UE meeting requirements from all candidate Relay UEs, wherein each piece of information corresponding to the Relay UE meeting the requirements in the information for selecting the target Relay UE meets the requirements after being compared with a corresponding threshold;
and the base station selects target Relay UE from the Relay UE which meets the requirement.
5. A method for reselecting a Relay UE, the method comprising:
the control plane of the Remote UE is connected with the base station;
after the Remote UE needs to reselect the Relay UE, determining information for selecting the target Relay UE according to the measurement parameters configured by the base station;
the control plane of the Remote UE reports the information for selecting the target Relay UE to the base station so that the base station selects the target Relay UE;
wherein the information for selecting the target Relay UE includes part or all of the following:
the residual energy of the candidate Relay UE, the load of the candidate Relay UE, the first channel quality between the user plane of the candidate Relay UE and the user plane of the Remote UE, the third channel quality between the candidate Relay UE and the base station, and the ID of the cell to which the candidate Relay UE belongs.
6. The method of claim 5, wherein before the Remote UE determines information for selecting a target Relay UE according to the measurement parameters configured by the base station, further comprising:
and the control plane of the Remote UE receives the measurement parameters configured by the base station through an RRC connection reconfiguration message.
7. A base station for reselecting a Relay UE, the base station comprising:
at least one processor and at least one memory, wherein the memory stores program code that, when executed by the processor, causes the processor to perform the following:
connecting with a user plane of a Remote UE through a source Relay UE; determining reselection information, wherein the reselection information comprises some or all of: first channel quality between a user plane of source Relay UE and a user plane of Remote UE, second channel quality between a base station and a control plane of Remote UE, residual energy of the source Relay UE, load of the source Relay UE, and third channel quality between the source Relay UE and the base station; and judging whether to reselect the Relay UE aiming at the user plane of the Remote UE according to the reselection information.
8. The base station of claim 7, wherein the processor is further configured to:
after judging whether Relay UE reselection is carried out on the user plane of the Remote UE or not according to the reselection information and determining that the Relay UE reselection needs to be carried out on the user plane of the Remote UE, configuring measurement parameters to the Remote UE; selecting target Relay UE according to the information for selecting the target Relay UE reported by the control plane of the Remote UE;
wherein the information for selecting the target Relay UE includes part or all of the following:
the residual energy of the candidate Relay UE, the load of the candidate Relay UE, the first channel quality between the user plane of the candidate Relay UE and the user plane of the Remote UE, the third channel quality between the candidate Relay UE and the base station, and the ID of the cell to which the candidate Relay UE belongs.
9. The base station of claim 8, wherein the processor is specifically configured to:
for any candidate Relay UE, determining a priority factor of the candidate Relay UE according to information corresponding to the candidate Relay UE in the information for selecting the target Relay UE and a preset weight; and selecting the candidate Relay UE corresponding to the maximum priority factor as the target Relay UE.
10. The base station of claim 8, wherein the processor is specifically configured to:
determining Relay UE meeting requirements from all candidate Relay UEs, wherein each piece of information corresponding to the Relay UE meeting the requirements in the information for selecting the target Relay UE meets the requirements after being compared with a corresponding threshold; and selecting target Relay UE from the Relay UEs meeting the requirements.
11. A Remote UE for reselecting a Relay UE, the Remote UE comprising:
when the control plane of the Remote UE is connected with the base station; after the Relay UE needs to be reselected, determining information for selecting the target Relay UE according to the measurement parameters configured by the base station; reporting the information for selecting the target Relay UE to the base station so that the base station selects the target Relay UE;
wherein the information for selecting the target Relay UE includes part or all of the following:
the residual energy of the candidate Relay UE, the load of the candidate Relay UE, the first channel quality between the user plane of the candidate Relay UE and the user plane of the Remote UE, the third channel quality between the candidate Relay UE and the base station, and the ID of the cell to which the candidate Relay UE belongs.
12. The Remote UE of claim 11, wherein the processor is further configured to:
before determining the information for selecting the target Relay UE according to the measurement parameters configured by the base station, receiving the measurement parameters configured by the base station through an RRC connection reconfiguration message.
13. A base station for reselecting a Relay UE, the base station comprising:
the determining module is used for connecting with a user plane of a Remote UE through a source Relay UE; determining reselection information, wherein the reselection information comprises some or all of: first channel quality between a user plane of source Relay UE and a user plane of Remote UE, second channel quality between a base station and a control plane of Remote UE, residual energy of the source Relay UE, load of the source Relay UE, and third channel quality between the source Relay UE and the base station;
and the judging module is used for judging whether to carry out the reselection of the Relay UE aiming at the user plane of the Relay UE according to the reselection information.
14. A Remote UE for reselecting a Relay UE, the Remote UE comprising:
a determining module, configured to when a control plane of a Remote UE is connected to a base station; after the Relay UE needs to be reselected, determining information for selecting the target Relay UE according to the measurement parameters configured by the base station;
an information reporting module, configured to report the information for selecting the target Relay UE to the base station, so that the base station selects the target Relay UE;
wherein the information for selecting the target Relay UE includes part or all of the following:
the residual energy of the candidate Relay UE, the load of the candidate Relay UE, the first channel quality between the user plane of the candidate Relay UE and the user plane of the Remote UE, the third channel quality between the candidate Relay UE and the base station, and the ID of the cell to which the candidate Relay UE belongs.
CN201810635083.XA 2018-06-15 2018-06-15 Method and equipment for reselecting Relay UE Pending CN110611901A (en)

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