CN107889080B - Method and device for supporting mobility of remote user equipment - Google Patents

Method and device for supporting mobility of remote user equipment Download PDF

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Publication number
CN107889080B
CN107889080B CN201610866604.3A CN201610866604A CN107889080B CN 107889080 B CN107889080 B CN 107889080B CN 201610866604 A CN201610866604 A CN 201610866604A CN 107889080 B CN107889080 B CN 107889080B
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remote
base station
information
relay
mobility
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CN107889080A (en
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黄莹
陈琳
陈玉芹
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ZTE Corp
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ZTE Corp
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Priority to PCT/CN2017/096164 priority patent/WO2018059126A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/03—Reselecting a link using a direct mode connection
    • H04W36/033—Reselecting a link using a direct mode connection in pre-organised networks
    • 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
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user

Abstract

The invention discloses a method and a device for supporting the mobility of remote user equipment, comprising the following steps: a remote User Equipment (UE) transmits mobility-related information to a base station to cause the base station to perform mobility-related operations for the remote UE; the remote UE receives communication configuration information from the base station.

Description

Method and device for supporting mobility of remote user equipment
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to a method and apparatus for supporting mobility of a remote User Equipment (UE).
Background
With the development of wireless multimedia services, there is an increasing demand for high data rates and user experiences, thereby placing higher demands on the system capacity and coverage of conventional cellular networks. On the other hand, the popularity of social networking, close-range data sharing, local advertising, etc. applications has led to an increasing demand for people to learn about and communicate with people or things of interest nearby (Proximity Services ). Conventional cell-based cellular networks have significant limitations in terms of high data rates and support for proximity services, and in the context of this demand, D2D (Device-to-Device) technology has emerged, representing a new direction of future communication technology development. The application of the D2D technology can reduce the burden of a cellular network, reduce the battery power consumption of user equipment, improve the data rate, improve the robustness of network infrastructure and well meet the requirements of the high data rate service and the proximity service.
D2D technology may operate in an licensed or unlicensed frequency band, allowing multiple D2D enabled User equipments (i.e., D2D User equipments) for direct discovery/direct communication with or without a network infrastructure. D2D technologies typically include D2D discovery technologies and D2D communication technologies. D2D discovery techniques refer to techniques for determining/determining that two or more D2D user devices are in proximity to each other (e.g., within range where D2D direct communication is possible) or for determining/determining that a first user device is in proximity to a second user device. D2D communication technology refers to a technology in which some or all of communication data between D2D user equipments may be directly communicated without through a network infrastructure.
The D2D application scenarios for R12 and R13 are mainly three:
1) UE1 and UE2 interact with data under the coverage of the cellular network, and the user plane data does not go through the network infrastructure, as in mode 1 of fig. 1;
2) UE relay transmission in weak/no coverage areas, such as mode 2 in fig. 1, allows UE4 with poor signal quality to communicate with the network through UE3 with network coverage nearby, which can help operators to extend coverage and increase capacity;
3) In the event of an earthquake or emergency, the cellular network is not able to function properly, allowing direct communication between devices, such as mode 3, UE5, UE6 and UE7 in fig. 1, with one or more hops of data communication without going through the network infrastructure at the control plane and user plane.
In the above R13D2D scenarios 2) and 3), the D2D UE may act as a relay node, enabling remote D2D UEs (remote D2D UEs) at the edge of or outside the coverage of the cellular network to communicate with the network in a cellular manner via the relay node UE, and enabling D2D communication between D2D UEs via the relay node UE. In R13D2D, D2D UEs (also referred to as relay UEs) as relay nodes forward data according to information such as a target IP address/port number in layer 3 (i.e., IP layer), whereas in R14D2D technologies, it is considered that a wearable device (e.g., MTE or NB-IoT device, which may be referred to as remote UE) accesses a network scenario through the relay UEs, so that an operator (i.e., core network element MME, etc., and a base station) can more effectively manage the wearable device (i.e., remote UE), and the relay UEs are required to perform routing forwarding of data in layer 2. In the layer 2 routing forwarding manner, R14D2D needs to maintain the context of the remote UE at a base station, MME (Mobility Management Entity, mobility management function entity) and other network elements, so as to perform some management control on the remote UE. In the mobility scenario, for example, as shown in fig. 2, the remote UE is out of coverage and performs communication through the Relay UE1 access network, and after the Relay UE1 (Relay UE1 shown in fig. 2) gradually moves out of the proximity of the remote UE (OOC UE1 shown in fig. 2), the remote UE changes to perform communication through the Relay UE2 (Relay UE2 shown in fig. 2) access network. Alternatively, a remote UE accessing the network through a relay UE may need to be changed to communicate directly accessing the network through a base station. The prior art does not provide a method for supporting the mobility of remote UE in the layer 2 routing mode.
Disclosure of Invention
In order to solve the problem of how to support remote UE mobility in a layer 2 routing manner, the embodiments of the present invention provide a method and apparatus for supporting remote UE mobility, so that handover between a relay UE and a base station and handover between relay UEs can be smoothly performed, so as to ensure service continuity of D2D services.
The embodiment of the invention provides a method for supporting the mobility of remote user equipment, which comprises the following steps:
the remote UE sends mobility related information to a base station so that the base station executes mobility related operation for the remote UE;
the remote UE receives communication configuration information from the base station.
In the above aspect, the mobility related information includes at least one of:
direct connection indication information; relay instruction information; relay UE identification information; an access technology for remote UE access to relay UE; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; a target cell identification; a target base station identifier; cell identification information serving the target relay UE/connected relay UE; base station identification information serving the target relay UE/connected relay UE; PC5 link quality information between the remote UE and the relay UE, which is measured by the remote UE; uu link Radio Resource Management (RRM) measurement information of a serving cell and/or a neighboring cell measured by a remote UE; remote UE identity information.
In the above scheme, the relay UE identification information is the relay UE connected to the remote UE, or the relay UE paired with the remote UE, or the relay UE associated with the remote UE, or the identification information of the relay UE selected by the remote UE.
In the above scheme, the access technology for the remote UE to access the relay UE includes one of the following: third generation partnership project (3 GPP) technology; non-third generation partnership project (non-3 GPP) technology; unilateral communication (sidelink communication); wireless local area network (WiFi); bluetooth (Bluetooth).
In the above scheme, before the remote UE sends the mobility related information to the base station, the method further includes:
the remote UE receives mobility measurement threshold value information configured by the base station through a system message or a Radio Resource Control (RRC) special signaling; or the remote UE obtains the mobility measurement threshold value information in a preconfigured mode.
In the above scheme, the mobility measurement threshold value information includes at least one of:
a PC5 link measurement threshold value;
the RRM of the serving cell measures the threshold value;
the PC5 link measures the offset.
In the above scheme, before the remote UE sends the mobility related information to the base station, the method further includes at least one of:
The PC5 link quality measured value between the remote UE and the relay UE is larger than or equal to the PC5 link measured threshold value;
the PC5 link quality measured value between the remote UE and the relay UE is smaller than or equal to the PC5 link measured threshold value;
the RRM measured value of the serving cell is smaller than or equal to the RRM measured threshold value of the serving cell;
the RRM measured value of the serving cell is larger than or equal to the RRM measured threshold value of the serving cell;
the value obtained by subtracting the PC5 link quality measurement value between the remote UE and the service relay UE from the PC5 link quality measurement value between the remote UE and the adjacent relay UE is larger than or equal to the PC5 link measurement offset.
In the scheme, the remote UE receives mobility measurement threshold value information from the base station through a Uu interface; or the remote UE receives the mobility measurement threshold value information forwarded by the relay UE and received from the base station from the relay UE through the PC5 interface.
In the above scheme, the remote UE sends mobility related information to the base station, including:
the remote UE sends mobility related information to the base station through a Uu interface; or the remote UE sends the mobility related information to the relay UE, and the relay UE sends the mobility related information to the base station.
In the above scheme, the remote UE sends mobility related information to the base station, including at least one of the following:
The remote UE sends mobility related information to the base station through an RRC connection request message;
the remote UE sends mobility related information to the base station through an RRC connection reestablishment message;
the remote UE sends mobility related information to the base station through a unilateral link user equipment information sidelink UE information message;
the remote UE sends mobility related information to the base station through a measurement report message;
and the remote UE sends the mobility related information to the base station through the new RRC message.
In the above scheme, the remote UE sends mobility related information to the base station through the RRC connection request message, including:
the remote UE includes cause value indication information in the RRC connection request message, where the cause value indication information is used to indicate that the remote UE changes from a mode of being accessed by the relay UE to a mode of being accessed by the base station, or changes from a mode of being accessed by the base station to a mode of being accessed by the relay UE, and/or a serving base station of the remote UE is unchanged, and/or a serving base station of the remote UE is changed.
In the above scheme, the remote UE sends mobility related information to the base station through the RRC connection reestablishment message, including:
the remote UE includes cause value indication information in the RRC connection reestablishment message, where the cause value indication information is used to indicate that the remote UE changes from a mode of being accessed by the relay UE to a mode of being accessed by the base station, or changes from a mode of being accessed by the base station to a mode of being accessed by the relay UE, and/or a serving base station of the remote UE is unchanged, and/or a serving base station of the remote UE is changed.
In the above scheme, before the remote UE sends mobility related information to the base station, the method includes at least one of:
the remote UE receives UE identification information allocated by the base station from the relay UE or the base station, wherein the UE identification information comprises one of the following components: the cell radio network temporary identifier C-RNTI, the S1 application protocol identifier S1AP ID, the X2 application protocol identifier X2AP ID, and the GPRS tunnel protocol tunnel endpoint identifier GTP TEID;
the remote UE receives cell identification information of its serving cell from the relay UE or the base station, said cell identification information comprising a cell global identifier ECGI and/or physical cell identifier PCI information.
In the above scheme, the remote UE receives communication configuration information from the base station, including:
the remote UE receives communication configuration information from a base station through a Uu interface; alternatively, the remote UE receives communication configuration information from the relay UE, the communication configuration information being received by the relay UE from the base station.
In the above scheme, the communication configuration information includes at least one of the following:
direct connection indication information; relay instruction information; relay UE identification information; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; the PC5 carries configuration information; PC5 resource configuration information; uu carries configuration information; carrying mapping configuration information; PC5 connection release information; remote UE identity information.
In the above solution, the bearer mapping configuration information includes at least one of the following:
the mapping relation between EPS bearing/Uu bearing of the evolution grouping system and PC5 interface bearing;
the mapping relation between the PC5 interface bearing and the evolved packet system EPS bearing/Uu interface bearing;
mapping relation between Uu interface logic channels and PC5 interface logic channels;
mapping relation between the PC5 interface logic channel and Uu interface logic channel.
In the above scheme, the mapping relationship between the PC5 interface bearer and the evolved packet system EPS bearer/Uu interface bearer is a PPPP-QCI mapping table, or a QCI-QCI mapping table for the Uu interface for the PC5 interface; the mapping relation between EPS bearing/Uu interface bearing of the evolution grouping system and PC5 interface bearing is a QCI-PPPP mapping table or a QCI-QCI mapping table for the Uu interface and the PC5 interface.
In the above solution, after the remote UE receives the communication configuration information from the base station, the method further includes at least one of:
the remote UE initiates a PC5 connection establishment process to the relay UE;
the remote UE initiates a PC5 connection release process to the relay UE;
the remote UE communicates through the relay function of the relay UE;
the remote UE directly communicates through the base station;
The remote UE sends mobility related information to the MME of the remote UE.
In the above scheme, the remote UE sends the mobility related information to the MME of the remote UE, so that the MME of the remote UE updates the context of the remote UE according to the received mobility related information.
The embodiment of the invention also provides a method for supporting the mobility of the remote user equipment, which comprises the following steps:
the base station receives mobility related information sent by remote UE;
the base station performs mobility-related operations for the remote UE.
In the above aspect, the mobility related information includes at least one of:
direct connection indication information; relay instruction information; relay UE identification information; an access technology for remote UE access to relay UE; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; a target cell identification; a target base station identifier; cell identification information serving the target relay UE/connected relay UE; base station identification information serving the target relay UE/connected relay UE; PC5 link quality information between the remote UE and the relay UE, which is measured by the remote UE; uu link RRM measurement information of a serving cell and/or a neighboring cell measured by a remote UE; remote UE identity information.
In the above scheme, the relay UE identification information is the relay UE connected to the remote UE, or the relay UE paired with the remote UE, or the relay UE associated with the remote UE, or the identification information of the relay UE selected by the remote UE.
In the above scheme, the access technology for the remote UE to access the relay UE includes one of the following: 3GPP technology; non-3GPP technology; sidelink communication; wiFi; bluetooth.
In the above scheme, the base station receives mobility related information sent by the remote UE, including:
the base station receives mobility related information sent by remote UE through Uu interface; or, the base station receives mobility related information sent by the relay UE through the Uu interface, where the mobility related information sent by the relay UE is received by the relay UE from the remote UE.
In the above scheme, the base station receives mobility related information sent by the remote UE, including at least one of the following:
the base station receives the mobility related information from the remote UE through the RRC connection request message;
the base station receives the mobility related information from the remote UE through the RRC connection reestablishment message;
the base station receives the mobility related information from the remote UE through sidelink UE information message;
the base station receives the mobility related information from the remote UE through the measurement report message;
The base station receives the mobility-related information from the remote UE through the newly added RRC message.
In the above scheme, the base station performs mobility-related operations for the remote UE, including at least one of the following:
the base station updates the context information of the remote UE according to the received mobility related information;
the base station sends communication configuration information to remote UE;
the base station sends communication configuration information to relay UE;
the base station sends mobility related information to an MME of a remote UE;
and the base station initiates a switching flow for the remote UE.
In the above scheme, the communication configuration information includes at least one of the following:
direct connection indication information; relay instruction information; relay UE identification information; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; the PC5 carries configuration information; PC5 resource configuration information; uu carries configuration information; carrying mapping configuration information; PC5 connection release information; remote UE identity information.
In the above scheme, the base station sends the mobility related information to the MME of the remote UE, so that the MME of the remote UE updates the context of the remote UE according to the received mobility related information.
In the above scheme, the base station initiates a handover procedure for the remote UE, including: the base station transmits mobility-related information to a target base station or a serving base station of the target relay UE, wherein the mobility-related information transmitted by the base station to the target base station or the serving base station of the target relay UE is the same as or different from the mobility-related information received from the remote UE.
In the above scheme, the base station sends mobility related information to a target base station or a serving base station of a target relay UE, including:
the base station sends mobility related information to a target base station or a service base station of a target relay UE through an X2 switching request message of an X2 interface; or the base station sends the mobility related information to the MME through a handover required message of the S1 interface, and the MME sends the mobility related information to the target base station or a serving base station of the target relay UE through a handover request message of the S1 interface.
In the above solution, after the base station sends mobility related information to the target base station or the serving base station of the target relay UE, the method further includes at least one of the following:
the base station receives communication configuration information sent by the target base station or a service base station of the target relay UE;
The target base station or the service base station of the target relay UE sends communication configuration information to the relay UE;
the target base station or the service base station of the target relay UE transmits communication configuration information to the remote UE;
and the target base station or the serving base station of the target relay UE transmits the mobility related information to the MME of the remote UE.
In the above scheme, after receiving the communication configuration information sent by the target base station, the base station includes at least one of the following:
the base station sends communication configuration information to remote UE;
and the base station sends communication configuration information to the relay UE.
An embodiment of the present invention provides an apparatus for supporting mobility of a remote user equipment, the apparatus comprising:
a transmitting unit, configured to transmit mobility-related information to a base station, so that the base station performs mobility-related operations for a remote UE;
and the first receiving unit is used for receiving the communication configuration information from the base station.
In the above aspect, the mobility related information includes at least one of:
direct connection indication information; relay instruction information; relay UE identification information; an access technology for remote UE access to relay UE; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; a target cell identification; a target base station identifier; cell identification information serving the target relay UE/connected relay UE; base station identification information serving the target relay UE/connected relay UE; PC5 link quality information between the remote UE and the relay UE, which is measured by the remote UE; uu link RRM measurement information of a serving cell and/or a neighboring cell measured by a remote UE; remote UE identity information.
In the above solution, the first receiving unit is further configured to receive mobility measurement threshold information configured by the base station through a system message or RRC dedicated signaling; or obtaining the mobility measurement threshold value information in a preconfigured mode.
In the above scheme, the sending unit is further configured to send mobility related information to the base station through the Uu interface; or, the mobility related information is sent to the relay UE, and the mobility related information is sent to the base station through the relay UE.
In the above aspect, the sending unit is further configured to perform at least one of:
transmitting mobility related information to the base station through an RRC connection request message;
transmitting mobility related information to the base station through an RRC connection reestablishment message;
transmitting mobility-related information to the base station through a sidelink UE information message;
transmitting mobility-related information to the base station through a measurement report message;
and sending the mobility related information to the base station through the new RRC message.
In the above solution, the first receiving unit is further configured to receive UE identification information allocated to the UE from the relay UE or the base station, where the UE identification information includes one of the following: C-RNTI, S1AP ID, X2AP ID, GTP TEID;
The first receiving unit is further configured to receive cell identification information of a serving cell of the relay UE or the base station from the relay UE or the base station, where the cell identification information includes a cell global identifier ECGI and/or physical cell identifier PCI information.
In the above scheme, the first receiving unit is further configured to receive communication configuration information from the base station through the Uu interface; alternatively, communication configuration information is received from the relay UE, the communication configuration information being received from the base station by the relay UE.
The embodiment of the invention also provides a device for supporting the mobility of the remote user equipment, which comprises:
a second receiving unit, configured to receive mobility related information sent by a remote UE;
and the execution unit is used for executing mobility related operation for the remote UE.
In the above aspect, the mobility related information includes at least one of:
direct connection indication information; relay instruction information; relay UE identification information; an access technology for remote UE access to relay UE; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; a target cell identification; a target base station identifier; cell identification information serving the target relay UE/connected relay UE; base station identification information serving the target relay UE/connected relay UE; PC5 link quality information between the remote UE and the relay UE, which is measured by the remote UE; uu link RRM measurement information of a serving cell and/or a neighboring cell measured by a remote UE; remote UE identity information.
In the above scheme, the second receiving unit is further configured to receive mobility related information sent by the remote UE through a Uu interface; or receiving mobility related information sent by the relay UE through the Uu interface, wherein the mobility related information sent by the relay UE is received by the relay UE from the remote UE.
In the above aspect, the second receiving unit is further configured to perform at least one of:
receiving mobility-related information from the remote UE through an RRC connection request message;
receiving mobility-related information from a remote UE through an RRC connection reestablishment message;
receiving mobility-related information from a remote UE through a sidelink UE information message;
receiving mobility-related information from a remote UE through a measurement report message;
and receiving the mobility related information from the remote UE through the newly added RRC message.
In the above solution, the executing unit is further configured to execute at least one of the following:
updating context information of the remote UE according to the received mobility related information;
transmitting communication configuration information to a remote UE;
transmitting communication configuration information to the relay UE;
transmitting mobility related information to an MME of a remote UE;
and initiating a switching flow for the remote UE.
In the technical scheme of the embodiment of the invention, a remote UE sends mobility related information to a base station so that the base station executes mobility related operation for the remote UE; the remote UE receives communication configuration information from the base station. By adopting the technical scheme of the embodiment of the invention, the problem of how to support the mobility of the remote UE in the layer 2 routing mode is solved, and compared with the prior art, the switching of the remote UE between the relay UE and the base station and the switching between the relay UE are smoothly executed, thereby ensuring the service continuity of the D2D service.
Drawings
FIG. 1 is a schematic diagram of an application mode of R12/R13D2D technology;
fig. 2 is a schematic diagram of a mobility scenario under R14D2D technology;
fig. 3 is a flowchart illustrating a method for supporting mobility of a remote user equipment according to an embodiment of the present invention;
fig. 4 is a flow chart II of a method for supporting mobility of a remote user equipment according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart of a first embodiment of the present invention;
FIG. 6 is a flow chart of a second embodiment of the present invention;
FIG. 7 is a schematic flow chart of a third embodiment of the present invention;
FIG. 8 is a flow chart of a fourth embodiment of the present invention;
FIG. 9 is a flow chart of a fifth embodiment of the present invention;
FIG. 10 is a flowchart of a sixth embodiment of the present invention;
fig. 11 is a schematic structural diagram of an apparatus for supporting mobility of a remote user equipment according to an embodiment of the present invention;
fig. 12 is a schematic diagram of a second structural component of an apparatus for supporting mobility of a remote user equipment according to an embodiment of the present invention;
fig. 13 is a block diagram of a hardware structure of a terminal or a base station according to an embodiment of the present invention.
Detailed Description
For a more complete understanding of the nature and the technical content of the embodiments of the present invention, reference should be made to the following detailed description of embodiments of the invention, taken in conjunction with the accompanying drawings, which are meant to be illustrative only and not limiting of the embodiments of the invention.
Fig. 3 is a flowchart of a method for supporting mobility of a remote user equipment according to an embodiment of the present invention, wherein the method for supporting mobility of a remote user equipment in this example is applied to a remote UE side, and as shown in fig. 3, the method for supporting mobility of a remote user equipment includes the following steps:
step 301: and the remote UE transmits the mobility related information to the base station so that the base station can execute mobility related operation for the remote UE.
Step 302: the remote UE receives communication configuration information from the base station.
In an embodiment of the present invention, the mobility-related information includes at least one of:
direct connection indication information; relay instruction information; relay UE identification information; an access technology for remote UE access to relay UE; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; a target cell identification; a target base station identifier; cell identification information serving the target relay UE/connected relay UE; base station identification information serving the target relay UE/connected relay UE; PC5 link quality information between the remote UE and the relay UE, which is measured by the remote UE; uu link radio resource management (RRM, radio Resource Management) measurement information of the serving cell and/or the neighboring cell measured by the remote UE; remote UE identity information.
In the embodiment of the invention, the relay UE identification information is the relay UE connected with the remote UE, or the relay UE paired with the remote UE, or the relay UE associated with the remote UE, or the identification information of the relay UE selected by the remote UE.
In the embodiment of the invention, the access technology for the remote UE to access the relay UE comprises one of the following steps: third generation partnership project (3 GPP) technology; non-third generation partnership project (non-3 GPP) technology; unilateral communication (sidelink communication); wireless local area network (WiFi); bluetooth (Bluetooth).
In the embodiment of the present invention, before the remote UE sends mobility related information to the base station, the method further includes:
the remote UE receives mobility measurement threshold value information configured by the base station through a system message or a radio resource control (RRC, radio Resource Control) proprietary signaling; or the remote UE obtains the mobility measurement threshold value information in a preconfigured mode.
In the embodiment of the present invention, the mobility measurement threshold information includes at least one of the following:
a PC5 link measurement threshold value;
the RRM of the serving cell measures the threshold value;
the PC5 link measures the offset.
In the embodiment of the present invention, before the remote UE sends mobility related information to the base station, the method further includes at least one of the following:
The PC5 link quality measured value between the remote UE and the relay UE is larger than or equal to the PC5 link measured threshold value;
the PC5 link quality measured value between the remote UE and the relay UE is smaller than or equal to the PC5 link measured threshold value;
the RRM measured value of the serving cell is smaller than or equal to the RRM measured threshold value of the serving cell;
the RRM measured value of the serving cell is larger than or equal to the RRM measured threshold value of the serving cell;
the value obtained by subtracting the PC5 link quality measurement value between the remote UE and the service relay UE from the PC5 link quality measurement value between the remote UE and the adjacent relay UE is larger than or equal to the PC5 link measurement offset.
In the embodiment of the invention, the remote UE receives mobility measurement threshold value information from the base station through a Uu interface; or the remote UE receives the mobility measurement threshold value information forwarded by the relay UE and received from the base station from the relay UE through the PC5 interface.
In the embodiment of the present invention, the remote UE sends mobility related information to the base station, including:
the remote UE sends mobility related information to the base station through a Uu interface; or the remote UE sends the mobility related information to the relay UE, and the relay UE sends the mobility related information to the base station.
In the embodiment of the invention, the remote UE sends mobility related information to the base station, including at least one of the following:
The remote UE sends mobility related information to the base station through an RRC connection request message;
the remote UE sends mobility related information to the base station through an RRC connection reestablishment message;
the remote UE sends mobility related information to the base station through a unilateral link user equipment information (sidelink UE information) message;
the remote UE sends mobility related information to the base station through a measurement report message;
and the remote UE sends the mobility related information to the base station through the new RRC message.
In the embodiment of the present invention, the remote UE sends mobility related information to the base station through the RRC connection request message, including:
the remote UE includes cause value indication information in the RRC connection request message, where the cause value indication information is used to indicate that the remote UE changes from a mode of being accessed by the relay UE to a mode of being accessed by the base station, or changes from a mode of being accessed by the base station to a mode of being accessed by the relay UE, and/or a serving base station of the remote UE is unchanged, and/or a serving base station of the remote UE is changed.
In the embodiment of the present invention, the remote UE sends mobility related information to the base station through the RRC connection reestablishment message, including:
the remote UE includes cause value indication information in the RRC connection reestablishment message, where the cause value indication information is used to indicate that the remote UE changes from a mode of being accessed by the relay UE to a mode of being accessed by the base station, or changes from a mode of being accessed by the base station to a mode of being accessed by the relay UE, and/or a serving base station of the remote UE is unchanged, and/or a serving base station of the remote UE is changed.
In the embodiment of the present invention, before the remote UE sends mobility related information to the base station, the method includes at least one of the following:
the remote UE receives UE identification information allocated by the base station from the relay UE or the base station, wherein the UE identification information comprises one of the following components: cell radio network temporary identity (C-RNTI), S1 application protocol identity (S1 AP ID), X2 application protocol identity (X2 AP ID), GPRS tunneling protocol tunnel endpoint identity (GTP TEID);
the remote UE receives cell identification information of its serving cell from the relay UE or the base station, said cell identification information comprising a cell global identifier ECGI and/or physical cell identifier PCI information.
In the embodiment of the invention, the remote UE receives communication configuration information from the base station, and the method comprises the following steps:
the remote UE receives communication configuration information from a base station through a Uu interface; alternatively, the remote UE receives communication configuration information from the relay UE, the communication configuration information being received by the relay UE from the base station.
In an embodiment of the present invention, the communication configuration information includes at least one of the following:
direct connection indication information; relay instruction information; relay UE identification information; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; the PC5 carries configuration information; PC5 resource configuration information; uu carries configuration information; carrying mapping configuration information; PC5 connection release information; remote UE identity information.
In an embodiment of the present invention, the bearer mapping configuration information includes at least one of the following:
the mapping relation between EPS bearing/Uu bearing of the evolution grouping system and PC5 interface bearing;
the mapping relation between the PC5 interface bearing and the evolved packet system EPS bearing/Uu interface bearing;
mapping relation between Uu interface logic channels and PC5 interface logic channels;
mapping relation between the PC5 interface logic channel and Uu interface logic channel.
In the embodiment of the invention, the mapping relation between the PC5 interface bearing and the evolved packet system EPS bearing/Uu interface bearing is a PPPP-QCI mapping table or a QCI-QCI mapping table for the Uu interface, which is used for the PC5 interface; the mapping relation between EPS bearing/Uu interface bearing of the evolution grouping system and PC5 interface bearing is a QCI-PPPP mapping table or a QCI-QCI mapping table for the Uu interface and the PC5 interface.
In an embodiment of the present invention, after the remote UE receives the communication configuration information from the base station, the method further includes at least one of:
the remote UE initiates a PC5 connection establishment process to the relay UE;
the remote UE initiates a PC5 connection release process to the relay UE;
the remote UE communicates through the relay function of the relay UE;
the remote UE directly communicates through the base station;
The remote UE sends mobility related information to the MME of the remote UE.
In the embodiment of the invention, the remote UE sends the mobility related information to the MME of the remote UE, so that the MME of the remote UE updates the context of the remote UE according to the received mobility related information.
Fig. 4 is a second flowchart of a method for supporting mobility of a remote user equipment according to an embodiment of the present invention, where the method for supporting mobility of a remote user equipment in this example is applied to a base station side, as shown in fig. 4, and the method for supporting mobility of a remote user equipment includes the following steps:
step 401: and the base station receives the mobility related information sent by the remote UE.
Step 402: the base station performs mobility-related operations for the remote UE.
In an embodiment of the present invention, the mobility-related information includes at least one of:
direct connection indication information; relay instruction information; relay UE identification information; an access technology for remote UE access to relay UE; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; a target cell identification; a target base station identifier; cell identification information serving the target relay UE/connected relay UE; base station identification information serving the target relay UE/connected relay UE; PC5 link quality information between the remote UE and the relay UE, which is measured by the remote UE; uu link RRM measurement information of a serving cell and/or a neighboring cell measured by a remote UE; remote UE identity information.
In the embodiment of the invention, the relay UE identification information is the relay UE connected with the remote UE, or the relay UE paired with the remote UE, or the relay UE associated with the remote UE, or the identification information of the relay UE selected by the remote UE.
In the embodiment of the invention, the access technology for the remote UE to access the relay UE comprises one of the following steps: 3GPP technology; non-3GPP technology; sidelink communication; wiFi; bluetooth.
In the embodiment of the invention, the base station receives the mobility related information sent by the remote UE, and comprises the following steps:
the base station receives mobility related information sent by remote UE through Uu interface; or, the base station receives mobility related information sent by the relay UE through the Uu interface, where the mobility related information sent by the relay UE is received by the relay UE from the remote UE.
In the embodiment of the invention, the base station receives the mobility related information sent by the remote UE, and the mobility related information comprises at least one of the following steps:
the base station receives the mobility related information from the remote UE through the RRC connection request message;
the base station receives the mobility related information from the remote UE through the RRC connection reestablishment message;
the base station receives the mobility related information from the remote UE through sidelink UE information message;
The base station receives the mobility related information from the remote UE through the measurement report message;
the base station receives the mobility-related information from the remote UE through the newly added RRC message.
In the embodiment of the present invention, the base station performs mobility-related operations for a remote UE, including at least one of the following:
the base station updates the context information of the remote UE according to the received mobility related information;
the base station sends communication configuration information to remote UE;
the base station sends communication configuration information to relay UE;
the base station sends mobility related information to an MME of a remote UE;
and the base station initiates a switching flow for the remote UE.
In an embodiment of the present invention, the communication configuration information includes at least one of the following:
direct connection indication information; relay instruction information; relay UE identification information; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; the PC5 carries configuration information; PC5 resource configuration information; uu carries configuration information; carrying mapping configuration information; PC5 connection release information; remote UE identity information.
In the embodiment of the invention, the base station sends the mobility related information to the MME of the remote UE, so that the MME of the remote UE updates the context of the remote UE according to the received mobility related information.
In the embodiment of the present invention, the base station initiates a handover procedure for the remote UE, including: the base station transmits mobility-related information to a target base station or a serving base station of the target relay UE, wherein the mobility-related information transmitted by the base station to the target base station or the serving base station of the target relay UE is the same as or different from the mobility-related information received from the remote UE.
In the embodiment of the present invention, the base station sends mobility related information to a target base station or a serving base station of a target relay UE, including:
the base station sends mobility related information to a target base station or a service base station of a target relay UE through an X2 switching request message of an X2 interface; or the base station sends the mobility related information to the MME through a handover required message of the S1 interface, and the MME sends the mobility related information to the target base station or a serving base station of the target relay UE through a handover request message of the S1 interface.
In the embodiment of the present invention, after the base station sends mobility related information to the target base station or the serving base station of the target relay UE, the method further includes at least one of the following:
The base station receives communication configuration information sent by the target base station or a service base station of the target relay UE;
the target base station or the service base station of the target relay UE sends communication configuration information to the relay UE;
the target base station or the service base station of the target relay UE transmits communication configuration information to the remote UE;
and the target base station or the serving base station of the target relay UE transmits the mobility related information to the MME of the remote UE.
In the embodiment of the present invention, after receiving the communication configuration information sent by the target base station, the base station includes at least one of the following:
the base station sends communication configuration information to remote UE;
and the base station sends communication configuration information to the relay UE.
The technical scheme of the embodiment of the invention is further described in detail below in combination with specific application scenes.
Example 1
The embodiment describes a mobility support method in a scenario where a remote UE switches from a base station to a relay UE. In the scenario of this embodiment, the remote UE directly performs data transmission with the base station, and then communicates with the network through relay forwarding of the relay UE, where the serving cell/base station of the relay UE is the same as the original serving cell/base station of the remote UE. As shown in fig. 5, the method of the present embodiment includes the steps of:
Step 501: and the remote UE which performs data transmission with the base station discovers the accessible relay UE through a relay discovery process, and optionally, if the remote UE discovers a plurality of accessible relay UEs, the relay UE with the best PC5 link quality is selected. Alternatively, the remote UE tends to select a relay UE that has the same serving cell/base station as the remote UE.
Step 502: optionally, the remote UE determines that the serving cell/base station of the selected relay UE is the same as its own serving cell/base station. Specifically, the remote UE may obtain the serving cell/base station identification information of the relay UE from the relay UE in a broadcast or unicast manner, for example, through a relay discovery message, or a PC5 connection establishment procedure.
Optionally, the remote UE detects that the serving cell RRM measurement value (e.g., RSRP value) is less than or equal to the serving cell RRM measurement threshold, and/or the PC5 link quality measurement value (e.g., RSRP value) with the relay UE is greater than or equal to the PC5 link measurement threshold; the serving cell RRM measurement threshold and/or the PC5 link measurement threshold are configured by the base station through a system message or RRC dedicated signaling, or are preconfigured. The remote UE sends mobility-related information to the base station, specifically, the mobility-related information includes one or a combination of the following:
Relay instruction information, relay UE identification information; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; cell identification information serving the target relay UE/connected relay UE; base station identification information serving the target relay UE/connected relay UE; PC5 link quality information between the remote UE and the relay UE, which is measured by the remote UE; remote UE identification information;
the remote UE may send mobility-related information to the base station by one or more of the following: 1) An RRC connection request message; 2) An RRC connection reestablishment message; 3) sidelink UE information message; 4) A measurement report message; 5) Newly adding an RRC message; if the RRC connection request message or the RRC connection reestablishment message is adopted, the RRC connection request message or the RRC connection reestablishment message needs to contain the cause value indication information; the cause value indication information is used for indicating that the remote UE is changed from the access mode of the base station to the access mode of the relay UE, and/or the service base station of the remote UE is not changed. For example, the remote UE transmits mobility-related information to the base station through sidelink UE information message and measurement report message, respectively.
Step 503: optionally, the base station determines that the serving cell/base station of the relay UE or the target relay UE connected to the remote UE is the same as itself.
After receiving the mobility related information sent by the remote UE, the base station updates the stored context information of the remote UE, so that the data packet from the remote UE received from the relay UE can be correctly processed subsequently, and the data packet from the remote UE received from the core network element can be correctly sent to the remote UE through the corresponding relay UE.
Optionally, the base station sends communication configuration information to the remote UE, and specifically, the communication configuration information may include one or a combination of the following:
relay instruction information, relay UE identification information; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; the PC5 carries configuration information; PC5 resource configuration information; uu carries configuration information; carrying mapping configuration information; remote UE identification information;
the base station may transmit communication configuration information to the remote UE through the RRC reconfiguration message. Wherein Uu bearer configuration information comprises bearer addition or modification or deletion configuration information. The bearer mapping configuration information comprises a mapping relation between EPS bearer/Uu bearer to PC5 interface bearer; alternatively, the mapping relationship between the EPS bearer/Uu bearer to the PC5 interface bearer may be a QCI-PPPP mapping table.
Step 504: the remote UE sends a direct communication request message to the relay UE requesting establishment of a PC5 connection with the relay UE.
Step 505: the relay UE sends sidelink UE information a message to the base station containing the remote UE identity, e.g., proSe layer2ID of the remote UE.
Step 506: optionally, the base station sends an RRC reconfiguration message to the remote UE, where the RRC reconfiguration message may include communication configuration information, and specifically, the communication configuration information may include one or a combination of the following:
relay instruction information, relay UE identification information; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; the PC5 carries configuration information; PC5 resource configuration information; uu carries configuration information; carrying mapping configuration information; remote UE identification information;
the time sequence of step 506 is not limited.
Step 507: the base station sends an RRC reconfiguration message to the relay UE, where the RRC reconfiguration message may include communication configuration information, and specifically, the communication configuration information may include one or a combination of the following:
Carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; the PC5 carries configuration information; PC5 resource configuration information; uu carries configuration information; carrying mapping configuration information; remote UE identification information;
wherein Uu bearer configuration information may include a bearer configuration dedicated to relay forwarding. The bearer mapping configuration information comprises one or a combination of the following: the mapping relation between the PC5 interface bearing and the Uu interface bearing; mapping relation between Uu interface load bearing and PC5 interface load bearing; optionally, the mapping relationship between the PC5 interface bearer and the Uu interface bearer may be a PPPP-QCI mapping table; the mapping relationship between Uu interface bearer and PC5 interface bearer may be a QCI-PPPP mapping table.
Step 508: the relay UE transmits a direct communication response message to the remote UE.
The chronological order of step 508 is not limited.
Step 509: optionally, the remote UE initiates NAS procedure and sends mobility related information to the MME. The MME updates the stored context information of the remote UE after receiving. Or, optionally, the base station sends the mobility related information to the MME through an S1 interface UE related procedure. The MME updates the stored context information of the remote UE after receiving.
Specifically, the mobility-related information includes one or a combination of the following:
relay instruction information, relay UE identification information; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; remote UE identification information;
example two
The embodiment describes a mobility support method in a scenario where a remote UE switches from a base station to a relay UE. In the scenario of this embodiment, the remote UE directly performs data transmission with the base station, and then communicates with the network through relay forwarding of the relay UE, where the serving cell/base station of the relay UE is different from the original serving cell/base station of the remote UE. As shown in fig. 6, the method of the present embodiment includes the steps of:
step 601: and the remote UE which performs data transmission with the base station discovers the accessible relay UE through a relay discovery process, and optionally, if the remote UE discovers a plurality of accessible relay UEs, the relay UE with the best PC5 link quality is selected.
Step 602: optionally, the remote UE determines that the serving cell/base station of the connected relay UE is different from the serving cell/base station of the remote UE. Specifically, the remote UE may obtain the serving cell/base station identification information of the relay UE from the relay UE in a broadcast or unicast manner, for example, through a relay discovery message, or a PC5 connection establishment procedure.
Optionally, the remote UE detects that the serving cell RRM measurement value (e.g., RSRP value) is less than or equal to the serving cell RRM measurement threshold, and/or the PC5 link quality measurement value (e.g., RSRP value) with the relay UE is greater than or equal to the PC5 link measurement threshold; the serving cell RRM measurement threshold and/or the PC5 link measurement threshold are configured by the base station through a system message or RRC dedicated signaling, or are preconfigured. The remote UE transmits mobility-related information to the serving base station (source base station in fig. 6), specifically, the mobility-related information includes one or a combination of the following:
relay instruction information, relay UE identification information; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; cell identification information serving the target relay UE/connected relay UE; base station identification information serving the target relay UE/connected relay UE; PC5 link quality information between the remote UE and the relay UE, which is measured by the remote UE; uu link RRM measurement information of a serving cell and/or a neighboring cell measured by a remote UE; remote UE identification information;
The remote UE may send mobility-related information to the serving base station by one or more of the following: 1) An RRC connection request message; 2) An RRC connection reestablishment message; 3) sidelink UE information message; 4) A measurement report message; 5) Newly adding an RRC message; if the RRC connection request message or the RRC connection reestablishment message is adopted, the RRC connection request message or the RRC connection reestablishment message needs to contain the cause value indication information; the cause value indication information is used for indicating that the remote UE is changed from a mode accessed by the base station to a mode accessed by the relay UE, and/or the service base station of the remote UE is changed. For example, the remote UE transmits mobility-related information to the serving base station through sidelink UE information message and measurement report message, respectively.
Step 603: the base station (i.e., source base station) determines that the serving cell/base station of the relay UE (also referred to as target relay UE) selected by the remote UE is different from itself. The base station (i.e., source base station) initiates a handover procedure to a serving base station (also referred to as a target base station) of the target relay UE. Specifically, the switching process may be an S1 switching process or an X2 switching process, and in this embodiment, the X2 switching process is taken as an example.
In the X2 handover procedure, the source base station sends an X2 handover request message to the target base station. The source base station includes mobility related information in the X2 handover request message, and specifically, the mobility related information includes one or any combination of the following:
Relay instruction information, relay UE identification information; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; remote UE identification information;
step 604: and the target base station sends an X2 switching request confirmation message to the source base station after performing admission control for the remote UE. Optionally, the message may include communication configuration information, where the communication configuration information includes one or any combination of the following:
relay instruction information, relay UE identification information; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; the PC5 carries configuration information; PC5 resource configuration information; uu carries configuration information; carrying mapping configuration information; remote UE identification information; the bearer mapping configuration information comprises a mapping relation between EPS bearer/Uu bearer and PC5 interface bearer; alternatively, the mapping relationship between the EPS bearer/Uu bearer to the PC5 interface bearer may be a QCI-PPPP mapping table. Optionally, the remote UE identification information is UE identification information allocated by the target base station to the remote UE.
Step 605: the source base station sends an RRC connection reconfiguration message to the remote UE. Optionally, the RRC connection reconfiguration message includes communication configuration information. Optionally, the communication configuration information is received by the source base station from the target base station. Specifically, the communication configuration information includes one or any combination of the following:
relay instruction information, relay UE identification information; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; the PC5 carries configuration information; PC5 resource configuration information; uu carries configuration information; carrying mapping configuration information; remote UE identification information;
the bearer mapping configuration information comprises a mapping relation between EPS bearer/Uu bearer and PC5 interface bearer; alternatively, the mapping relationship between the EPS bearer/Uu bearer to the PC5 interface bearer may be a QCI-PPPP mapping table.
Step 606: optionally, the remote UE sends an RRC reconfiguration complete message to the base station.
Step 607: the remote UE sends a direct communication request message to the relay UE requesting establishment of a PC5 connection with the relay UE.
Step 608: the relay UE transmits a direct communication response message to the remote UE.
The time sequence of step 608 is not limited.
Step 609: the relay UE sends sidelink UE information a message to the base station containing the remote UE identity, e.g., proSe layer2ID of the remote UE.
Step 610: the base station sends an RRC reconfiguration message to the relay UE, where the RRC reconfiguration message may include communication configuration information, and specifically, the communication configuration information may include one or a combination of the following:
carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; the PC5 carries configuration information; PC5 resource configuration information; uu carries configuration information; carrying mapping configuration information; remote UE identification information;
wherein Uu bearer configuration information may include a bearer configuration dedicated to relay forwarding. The bearer mapping configuration information comprises one or a combination of the following: the mapping relation between the PC5 interface bearing and the Uu interface bearing; mapping relation between Uu interface load bearing and PC5 interface load bearing; optionally, the mapping relationship between the PC5 interface bearer and the Uu interface bearer may be a PPPP-QCI mapping table; the mapping relationship between Uu interface bearer and PC5 interface bearer may be a QCI-PPPP mapping table.
Optionally, the relay UE sends an RRC reconfiguration complete message to the target base station.
Step 611: optionally, the base station sends an RRC reconfiguration message to the remote UE, where the RRC reconfiguration message may include communication configuration information, and specifically, the communication configuration information may include one or a combination of the following:
relay instruction information, relay UE identification information; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; the PC5 carries configuration information; PC5 resource configuration information; uu carries configuration information; carrying mapping configuration information; remote UE identification information;
the time sequence of step 611 is not limited.
Step 612: the source base station sends an SN state transition message to the target base station;
step 613: optionally, the remote UE sends an RRC connection reconfiguration complete message to the target base station. The remote UE may send an RRC connection reconfiguration complete message to the target base station directly through the Uu interface; or the remote UE may send the RRC connection reconfiguration complete message to the relay UE through the PC5 interface, and the relay UE sends the RRC connection reconfiguration complete message to the target base station.
Step 614: the target base station sends a path transfer request message to the MME of the remote UE. The path transfer request message may include mobility related information, and specifically, the mobility related information includes one or any combination of the following:
relay instruction information, relay UE identification information; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; remote UE identification information;
step 615: the MME of the remote UE sends a bearer modification request message to the SGW to update the downlink routing path at the SGW.
Step 616: the SGW of the remote UE replies a bearer modification response message to the MME.
Step 617: the MME of the remote UE sends a path transfer request acknowledgement message to the target base station.
Step 618: the target base station sends a user context release message to the source base station to release the context of the remote UE on the target base station.
Example III
The embodiment describes a mobility support method in a scenario where a remote UE is handed over from a relay UE to a base station. In the scenario of this embodiment, the remote UE communicates with the network through relay forwarding of the relay UE, and then directly performs data transmission with the base station, where the serving cell/base station of the relay UE is the same as the target serving cell/base station to which the remote UE is connected. As shown in fig. 7, the method of the present embodiment includes the steps of:
Step 701: optionally, the relay UE sends a PC5 connection release message to the remote UE to release the PC5 connection between the relay UE and the remote UE, e.g., if the relay UE detects that its own power is insufficient, the message is sent. Or the remote UE detects that the quality of the PC5 link with the relay UE is poor, or the remote UE detects that the quality of the PC5 link with the relay UE is lower than a specific threshold value. Alternatively, the threshold value may be configured by the base station via a system message or RRC-specific signaling, or preconfigured.
Step 702: optionally, the remote UE performs a relay selection/reselection procedure, and/or a cell selection/reselection procedure, or a serving cell/neighbor cell RRM measurement procedure. In this embodiment, the remote UE does not find an accessible relay UE and determines that it communicates directly through the current serving base station. Optionally, the remote UE determines that the serving cell/base station of the relay UE is the same as the serving cell/base station of the remote UE. Specifically, the remote UE may obtain the serving cell/base station identification information of the relay UE from the relay UE in a broadcast or unicast manner, for example, through a relay discovery message, or a PC5 connection establishment procedure.
Optionally, the remote UE detects that the serving cell RRM measurement value (e.g., RSRP value) is greater than or equal to the serving cell RRM measurement threshold, and/or the PC5 link quality measurement value (e.g., RSRP value) with the relay UE is less than or equal to the PC5 link measurement threshold; the serving cell RRM measurement threshold and/or the PC5 link measurement threshold are configured by the base station through a system message or RRC dedicated signaling, or are preconfigured. The remote UE sends mobility-related information to the serving base station, specifically, the mobility-related information includes one or a combination of the following:
Direct connection indication information; relay UE identification information; a target cell identification; a target base station identifier; PC5 link quality information between the remote UE and the relay UE, which is measured by the remote UE; remote UE identification information;
the remote UE may send mobility-related information to the base station by one or more of the following: 1) An RRC connection request message; 2) An RRC connection reestablishment message; 3) sidelink UE information message; 4) A measurement report message; 5) Newly adding an RRC message; if the RRC connection request message or the RRC connection reestablishment message is adopted, the RRC connection request message or the RRC connection reestablishment message needs to contain the cause value indication information; the cause value indication information is used for indicating that the remote UE is changed from the mode accessed by the relay UE to the mode accessed by the base station, and/or the service base station of the remote UE is not changed. For example, the remote UE transmits mobility-related information to the base station through sidelink UE information message and measurement report message, respectively.
Step 703: optionally, the base station determines that the serving cell/base station of the relay UE to which the remote UE is connected is the same as itself, or the base station determines context information of the existing remote UE.
Optionally, after receiving the mobility related information sent by the remote UE, the base station updates the stored context information of the remote UE, so that the data packet of the remote UE received from the core network element can be correctly sent to the remote UE subsequently.
Alternatively, the base station may transmit the communication configuration information to the remote UE through an RRC reconfiguration message. Specifically, the communication configuration information may include one or a combination of the following:
direct connection indication information; the PC5 carries configuration information; PC5 resource configuration information; uu carries configuration information; PC5 connection release information;
step 704: optionally, the remote UE sends a PC5 connection release message to the relay UE to release the PC5 connection between the remote UE and the relay UE.
Step 705: optionally, the base station sends an RRC reconfiguration message to the relay UE, where the RRC reconfiguration message may include communication configuration information, and specifically, the communication configuration information may include one or a combination of the following:
direct connection indication information; the PC5 carries configuration information; PC5 resource configuration information; uu carries configuration information; PC5 connection release information; remote UE identification information;
step 706: optionally, the remote UE initiates NAS procedure and sends mobility related information to the MME. The MME updates the stored context information of the remote UE after receiving. Or, optionally, the base station sends the mobility related information to the MME through an S1 interface UE related procedure. The MME updates the stored context information of the remote UE after receiving.
Specifically, the mobility-related information includes one or a combination of the following: direct connection indication information; relay UE identification information; remote UE identification information;
example IV
The embodiment describes a mobility support method in a scenario where a remote UE is handed over from a relay UE to a base station. In the scenario of this embodiment, the remote UE communicates with the network through relay forwarding of the relay UE, and then directly performs data transmission with the base station, where the serving cell/base station of the relay UE is different from the target serving cell/base station to which the remote UE is connected. As shown in fig. 8, the method of the present embodiment includes the steps of:
step 801: optionally, the relay UE sends a PC5 connection release message to the remote UE to release the PC5 connection between the relay UE and the remote UE, e.g., if the relay UE detects that its own power is insufficient, the message is sent. Or the remote UE detects that the quality of the PC5 link with the relay UE is poor, or the remote UE detects that the quality of the PC5 link with the relay UE is lower than a specific threshold value. Alternatively, the threshold value may be configured by the base station via a system message or RRC-specific signaling, or preconfigured.
Step 802: optionally, the remote UE performs a relay selection/reselection procedure, and/or a cell selection/reselection procedure, or a serving cell/neighbor cell RRM measurement procedure. In this embodiment, the remote UE does not find an accessible relay UE, and selects a cell under the target base station as a candidate cell. Optionally, the remote UE determines that the serving cell/base station of the relay UE is different from the candidate/target cell/base station of the remote UE. Specifically, the remote UE may obtain the serving cell/base station identification information of the relay UE from the relay UE in a broadcast or unicast manner, for example, through a relay discovery message, or a PC5 connection establishment procedure.
Optionally, the remote UE detects that the serving cell RRM measurement value (e.g., RSRP value) is greater than or equal to the serving cell RRM measurement threshold, and/or the PC5 link quality measurement value (e.g., RSRP value) with the relay UE is less than or equal to the PC5 link measurement threshold; the serving cell RRM measurement threshold and/or the PC5 link measurement threshold are configured by the base station through a system message or RRC dedicated signaling, or are preconfigured. The remote UE may send mobility related information to the serving base station (also referred to as a source base station), and the remote UE may send mobility related information to the source base station directly through the Uu interface, or the remote UE may send mobility related information to the relay UE through the PC5 interface first, and the relay UE may send mobility related information to the source base station through the Uu interface. Specifically, the mobility-related information includes one or a combination of the following:
direct connection indication information; relay UE identification information; a target cell identification; a target base station identifier; PC5 link quality information between the remote UE and the relay UE, which is measured by the remote UE; remote UE identification information;
the remote UE may send mobility-related information to the base station by one or more of the following: 1) An RRC connection request message; 2) An RRC connection reestablishment message; 3) sidelink UE information message; 4) A measurement report message; 5) Newly adding an RRC message; if the RRC connection request message or the RRC connection reestablishment message is adopted, the RRC connection request message or the RRC connection reestablishment message needs to contain the cause value indication information; the cause value indication information is used for indicating that the remote UE is changed from a mode accessed by the relay UE to a mode accessed by the base station, and/or the service base station of the remote UE is changed. For example, the remote UE transmits mobility-related information to the base station through sidelink UE information message and measurement report message, respectively.
Step 803: the base station (i.e. the source base station) determines that the target cell/base station selected by the remote UE is different from itself. The base station (i.e., source base station) initiates a handover procedure to the target base station. Specifically, the switching process may be an S1 switching process or an X2 switching process, and in this embodiment, the X2 switching process is taken as an example.
In the X2 handover procedure, the source base station sends an X2 handover request message to the target base station. The source base station includes mobility related information in the X2 handover request message, and specifically, the mobility related information includes one or any combination of the following:
direct connection indication information; a target cell identification; a target base station identifier; remote UE identification information;
step 804: and the target base station sends an X2 switching request confirmation message to the source base station after performing admission control for the remote UE. Optionally, the message may include communication configuration information, where the communication configuration information includes one or any combination of the following:
direct connection indication information; the PC5 carries configuration information; PC5 resource configuration information; uu carries configuration information; PC5 connection release information;
step 805: the source base station sends an RRC connection reconfiguration message to the remote UE. Optionally, the RRC connection reconfiguration message includes communication configuration information. Optionally, the communication configuration information is received by the source base station from the target base station. Specifically, the communication configuration information includes one or any combination of the following:
Direct connection indication information; the PC5 carries configuration information; PC5 resource configuration information; uu carries configuration information; PC5 connection release information;
step 806: the source base station sends an SN state transition message to the target base station;
step 807: optionally, the remote UE sends an RRC connection reconfiguration complete message to the target base station.
Step 808: optionally, the remote UE sends a PC5 connection release message to the relay UE to release the PC5 connection between the remote UE and the relay UE.
Step 809: the target base station sends a path transfer request message to the MME of the remote UE. The path transfer request message may include mobility related information, and specifically, the mobility related information includes one or any combination of the following: direct connection indication information; a target cell identification; a target base station identifier; remote UE identification information;
step 810: the MME of the remote UE sends a bearer modification request message to the SGW to update the downlink routing path at the SGW.
Step 811: the SGW of the remote UE replies a bearer modification response message to the MME.
Step 812: the MME of the remote UE sends a path transfer request acknowledgement message to the target base station.
Step 813: the target base station sends a user context release message to the source base station to release the context of the remote UE on the target base station.
Step 814: optionally, the source base station sends an RRC message to the relay UE to instruct the relay UE to release the context information of the remote UE. Specifically, the source base station may be indicated by an RRC connection reconfiguration message, or other newly added RRC message.
Example five
The present embodiment describes a mobility support method in a scenario where a remote UE switches from a relay UE1 to a relay UE 2. In the scenario of this embodiment, the remote UE communicates with the network through relay forwarding of the relay UE1, and then communicates with the network through relay forwarding of the relay UE2, where the serving cell/base station of the relay UE1 is the same as the serving cell/base station of the relay UE 2. As shown in fig. 9, the method of the present embodiment includes the steps of:
step 901: the remote UE discovers the accessible relay UE2 through a relay discovery or relay reselection process, and optionally, if the remote UE discovers a plurality of accessible relay UEs, the remote UE selects the relay UE with the best PC5 link quality. Alternatively, the remote UE tends to select a relay UE that has the same serving cell/base station as the remote UE.
Step 902: optionally, the remote UE determines that the serving cell/base station of the selected target relay UE is the same as its own serving cell/base station. Specifically, the remote UE may obtain the serving cell/base station identification information of the relay UE from the relay UE in a broadcast or unicast manner, for example, through a relay discovery message, or a PC5 connection establishment procedure.
Optionally, the value obtained by subtracting the measured value of the quality of the PC5 link between the remote UE and the serving relay UE from the measured value of the quality of the PC5 link between the remote UE and the adjacent relay UE is larger than or equal to the measured offset of the PC5 link; wherein, the PC5 link measurement offset is configured by the base station through a system message or RRC dedicated signaling, or is preconfigured. The remote UE sends mobility-related information to the base station, specifically, the mobility-related information includes one or a combination of the following:
relay instruction information, relay UE identification information; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; cell identification information serving the target relay UE/connected relay UE; base station identification information serving the target relay UE/connected relay UE; PC5 link quality information between the remote UE and the relay UE, which is measured by the remote UE; remote UE identification information;
the remote UE may send mobility-related information to the base station by one or more of the following: 1) An RRC connection request message; 2) An RRC connection reestablishment message; 3) sidelink UE information message; 4) A measurement report message; 5) Newly adding an RRC message; if the RRC connection request message or the RRC connection reestablishment message is adopted, the RRC connection request message or the RRC connection reestablishment message needs to contain the cause value indication information; the cause value indication information is used for indicating that the remote UE is changed from the mode accessed by the relay UE to the mode accessed by the relay UE, and/or the service base station of the remote UE is unchanged. For example, the remote UE transmits mobility-related information to the base station through sidelink UE information message and measurement report message, respectively.
Step 903: optionally, the base station determines that the serving cell/base station of the target relay UE selected by the remote UE is the same as itself.
After receiving the mobility related information sent by the remote UE, the base station updates the stored context information of the remote UE, so that the data packet from the remote UE received from the relay UE can be correctly processed subsequently, and the data packet from the remote UE received from the core network element can be correctly sent to the remote UE through the corresponding relay UE.
Optionally, the base station sends communication configuration information to the remote UE, and specifically, the communication configuration information may include one or a combination of the following:
relay instruction information, relay UE identification information; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; the PC5 carries configuration information; PC5 resource configuration information; uu carries configuration information; carrying mapping configuration information; remote UE identification information;
the base station may transmit communication configuration information to the remote UE through the RRC reconfiguration message. Wherein Uu bearer configuration information comprises bearer addition or modification or deletion configuration information. The bearer mapping configuration information comprises a mapping relation between EPS bearer/Uu bearer to PC5 interface bearer; alternatively, the mapping relationship between the EPS bearer/Uu bearer to the PC5 interface bearer may be a QCI-PPPP mapping table.
Step 904: the remote UE sends a direct communication request message to the target relay UE requesting establishment of a PC5 connection with the target relay UE.
Step 905: the target relay UE sends sidelink UE information a message to the base station containing the remote UE identity, e.g., proSe layer2ID of the remote UE.
Step 906: the base station sends an RRC reconfiguration message to the target relay UE, where the RRC reconfiguration message may include communication configuration information, and specifically, the communication configuration information may include one or a combination of the following:
carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; the PC5 carries configuration information; PC5 resource configuration information; uu carries configuration information; carrying mapping configuration information; remote UE identification information;
wherein Uu bearer configuration information may include a bearer configuration dedicated to relay forwarding. The bearer mapping configuration information comprises one or a combination of the following: the mapping relation between the PC5 interface bearing and the Uu interface bearing; mapping relation between Uu interface load bearing and PC5 interface load bearing; optionally, the mapping relationship between the PC5 interface bearer and the Uu interface bearer may be a PPPP-QCI mapping table; the mapping relationship between Uu interface bearer and PC5 interface bearer may be a QCI-PPPP mapping table.
Step 907: optionally, the base station sends an RRC reconfiguration message to the remote UE, where the RRC reconfiguration message may include communication configuration information, and specifically, the communication configuration information may include one or a combination of the following:
relay instruction information, relay UE identification information; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; the PC5 carries configuration information; PC5 resource configuration information; uu carries configuration information; carrying mapping configuration information; remote UE identification information;
step 908: the target relay UE sends a direct communication response message to the remote UE.
Step 909: optionally, the remote UE sends a PC5 connection release message to the source relay UE (relay UE 1) to release the PC5 connection between the remote UE and the relay UE 1.
Step 910: optionally, the base station sends an RRC message to the relay UE1 to instruct the relay UE1 to release the context information of the remote UE. Specifically, the base station may be indicated by an RRC connection reconfiguration message, or other newly added RRC message.
The time sequence of steps 906, 907, 908, 910 is not limited.
Step 911: optionally, the remote UE initiates NAS procedure and sends mobility related information to the MME. The MME updates the stored context information of the remote UE after receiving. Or, optionally, the base station sends the mobility related information to the MME through an S1 interface UE related procedure. The MME updates the stored context information of the remote UE after receiving.
Specifically, the mobility-related information includes one or a combination of the following: relay instruction information, relay UE identification information; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; remote UE identification information;
example six
The present embodiment describes a mobility support method in a scenario where a remote UE switches from a relay UE1 to a relay UE 2. In the scenario of this embodiment, the remote UE communicates with the network through relay forwarding of the relay UE1, and then communicates with the network through relay forwarding of the relay UE2, where the serving cell/base station of the relay UE1 is different from the serving cell/base station of the relay UE 2. As shown in fig. 10, the method of the present embodiment includes the steps of:
Step 1001: the remote UE discovers the accessible relay UE2 through a relay discovery or relay reselection process, and optionally, if the remote UE discovers a plurality of accessible relay UEs, the remote UE selects the relay UE with the best PC5 link quality.
Step 1002: optionally, the remote UE determines that the serving cell/base station of the selected target relay UE is different from the serving cell/base station of the remote UE. Specifically, the remote UE may obtain the serving cell/base station identification information of the relay UE from the relay UE in a broadcast or unicast manner, for example, through a relay discovery message, or a PC5 connection establishment procedure.
Optionally, the value obtained by subtracting the measured value of the quality of the PC5 link between the remote UE and the serving relay UE from the measured value of the quality of the PC5 link between the remote UE and the adjacent relay UE is larger than or equal to the measured offset of the PC5 link; wherein, the PC5 link measurement offset is configured by the base station through a system message or RRC dedicated signaling, or is preconfigured. The remote UE sends mobility related information to the source base station, and the remote UE may directly send mobility related information to the source base station through the Uu interface, or the remote UE sends mobility related information to the relay UE through the PC5 interface, and the relay UE sends mobility related information to the source base station through the Uu interface. Specifically, the mobility-related information includes one or a combination of the following:
Relay instruction information, relay UE identification information; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; cell identification information serving the target relay UE/connected relay UE; base station identification information serving the target relay UE/connected relay UE; PC5 link quality information between the remote UE and the relay UE, which is measured by the remote UE; remote UE identification information;
the remote UE may send mobility-related information to the source base station by one or more of the following: 1) An RRC connection request message; 2) An RRC connection reestablishment message; 3) sidelink UE information message; 4) A measurement report message; 5) Newly adding an RRC message; if the RRC connection request message or the RRC connection reestablishment message is adopted, the RRC connection request message or the RRC connection reestablishment message needs to contain the cause value indication information; the cause value indication information is used for indicating that the remote UE is changed from the mode accessed by the relay UE to the mode accessed by the relay UE, and/or the service base station of the remote UE is changed. For example, the remote UE transmits mobility-related information to the base station through sidelink UE information message and measurement report message, respectively.
Step 1003: the base station (i.e., source base station) determines that the serving cell/base station of the relay UE (also referred to as target relay UE) selected by the remote UE is different from itself. The base station (i.e., source base station) initiates a handover procedure to a serving base station (also referred to as a target base station) of the target relay UE. Specifically, the switching process may be an S1 switching process or an X2 switching process, and in this embodiment, the X2 switching process is taken as an example.
In the X2 handover procedure, the source base station sends an X2 handover request message to the target base station. The source base station includes mobility related information in the X2 handover request message, and specifically, the mobility related information includes one or any combination of the following:
relay instruction information, relay UE identification information; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; remote UE identification information;
step 1004: and the target base station sends an X2 switching request confirmation message to the source base station after performing admission control for the remote UE. Optionally, the message may include communication configuration information, where the communication configuration information includes one or any combination of the following:
Relay instruction information, relay UE identification information; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; the PC5 carries configuration information; PC5 resource configuration information; uu carries configuration information; carrying mapping configuration information; remote UE identification information; the bearer mapping configuration information comprises a mapping relation between EPS bearer/Uu bearer and PC5 interface bearer; alternatively, the mapping relationship between the EPS bearer/Uu bearer to the PC5 interface bearer may be a QCI-PPPP mapping table. Optionally, the remote UE identification information is UE identification information allocated by the target base station to the remote UE.
Step 1005: the source base station sends an RRC connection reconfiguration message to the remote UE. Optionally, the RRC connection reconfiguration message includes communication configuration information. Optionally, the communication configuration information is received by the source base station from the target base station. Specifically, the communication configuration information includes one or any combination of the following:
relay instruction information, relay UE identification information; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; the PC5 carries configuration information; PC5 resource configuration information; uu carries configuration information; carrying mapping configuration information; remote UE identification information;
The bearer mapping configuration information comprises a mapping relation between EPS bearer/Uu bearer and PC5 interface bearer; alternatively, the mapping relationship between the EPS bearer/Uu bearer to the PC5 interface bearer may be a QCI-PPPP mapping table.
Step 1006: optionally, the remote UE sends an RRC reconfiguration complete message to the source base station.
Step 1007: the remote UE sends a direct communication request message to the relay UE requesting establishment of a PC5 connection with the relay UE.
Step 1008: the relay UE transmits a direct communication response message to the remote UE.
The time sequence of step 1008 is not limited.
Step 1009: the relay UE sends sidelink UE information a message to the target base station containing the remote UE identity, e.g., proSe layer2ID of the remote UE.
Step 1010: the target base station sends an RRC reconfiguration message to the relay UE, where the RRC reconfiguration message may include communication configuration information, and specifically, the communication configuration information may include one or a combination of the following:
carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; the PC5 carries configuration information; PC5 resource configuration information; uu carries configuration information; carrying mapping configuration information; remote UE identification information;
Wherein Uu bearer configuration information may include a bearer configuration dedicated to relay forwarding. The bearer mapping configuration information comprises one or a combination of the following: the mapping relation between the PC5 interface bearing and the Uu interface bearing; mapping relation between Uu interface load bearing and PC5 interface load bearing; optionally, the mapping relationship between the PC5 interface bearer and the Uu interface bearer may be a PPPP-QCI mapping table; the mapping relationship between Uu interface bearer and PC5 interface bearer may be a QCI-PPPP mapping table.
Step 1011: optionally, the target base station sends an RRC reconfiguration message to the remote UE, where the RRC reconfiguration message may include communication configuration information, and specifically, the communication configuration information may include one or a combination of the following:
relay instruction information, relay UE identification information; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; the PC5 carries configuration information; PC5 resource configuration information; uu carries configuration information; carrying mapping configuration information; remote UE identification information;
the time sequence of step 1011 is not limited.
Step 1012: the source base station sends an SN state transition message to the target base station;
step 1013: optionally, the remote UE sends an RRC connection reconfiguration complete message to the target base station. The remote UE may send an RRC connection reconfiguration complete message to the target base station directly through the Uu interface; or the remote UE may send the RRC connection reconfiguration complete message to the relay UE through the PC5 interface, and the relay UE sends the RRC connection reconfiguration complete message to the target base station.
Step 1014: optionally, the target relay UE sends an RRC connection reconfiguration complete message to the target base station.
Step 1015: optionally, the remote UE sends a PC5 connection release message to the source relay UE.
Step 1016: the target base station sends a path transfer request message to the MME of the remote UE. The path transfer request message may include mobility related information, and specifically, the mobility related information includes one or any combination of the following: relay instruction information, relay UE identification information; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; remote UE identification information;
Step 1017: the MME of the remote UE sends a bearer modification request message to the SGW to update the downlink routing path at the SGW.
Step 1018: the SGW of the remote UE replies a bearer modification response message to the MME.
Step 1019: the MME of the remote UE sends a path transfer request acknowledgement message to the target base station.
Step 1020: the target base station sends a user context release message to the source base station to release the context of the remote UE on the target base station.
Step 1021: the source base station transmits an RRC message to the relay UE1 to instruct the relay UE1 to release the context information of the remote UE. Specifically, the source base station may be indicated by an RRC connection reconfiguration message, or other newly added RRC message.
Fig. 11 is a schematic structural diagram of an apparatus for supporting mobility of a remote user equipment according to an embodiment of the present invention, as shown in fig. 11, the apparatus includes:
a transmitting unit 1101, configured to transmit mobility-related information to a base station, so that the base station performs mobility-related operations for a remote UE;
a first receiving unit 1102 is configured to receive communication configuration information from a base station.
In an embodiment of the present invention, the mobility-related information includes at least one of:
direct connection indication information; relay instruction information; relay UE identification information; an access technology for remote UE access to relay UE; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; a target cell identification; a target base station identifier; cell identification information serving the target relay UE/connected relay UE; base station identification information serving the target relay UE/connected relay UE; PC5 link quality information between the remote UE and the relay UE, which is measured by the remote UE; uu link RRM measurement information of a serving cell and/or a neighboring cell measured by a remote UE; remote UE identity information.
In the embodiment of the present invention, the first receiving unit 1102 is further configured to receive mobility measurement threshold information configured by the base station through a system message or RRC dedicated signaling; or obtaining the mobility measurement threshold value information in a preconfigured mode.
In the embodiment of the present invention, the sending unit 1101 is further configured to send mobility related information to a base station through a Uu interface; or, the mobility related information is sent to the relay UE, and the mobility related information is sent to the base station through the relay UE.
In the embodiment of the present invention, the sending unit 1101 is further configured to perform at least one of the following:
transmitting mobility related information to the base station through an RRC connection request message;
transmitting mobility related information to the base station through an RRC connection reestablishment message;
transmitting mobility-related information to the base station through a sidelink UE information message;
transmitting mobility-related information to the base station through a measurement report message;
and sending the mobility related information to the base station through the new RRC message.
In this embodiment of the present invention, the first receiving unit 1102 is further configured to receive UE identification information allocated to a base station from a relay UE or the base station, where the UE identification information includes one of the following: C-RNTI, S1AP ID, X2AP ID, GTP TEID;
The first receiving unit 1102 is further configured to receive cell identification information of a serving cell of the relay UE or the base station, where the cell identification information includes a cell global identifier ECGI and/or physical cell identifier PCI information.
In the embodiment of the present invention, the first receiving unit 1102 is further configured to receive communication configuration information from a base station through a Uu interface; alternatively, communication configuration information is received from the relay UE, the communication configuration information being received from the base station by the relay UE.
Those skilled in the art will appreciate that the implementation functions of the units in the apparatus for supporting remote user equipment mobility shown in fig. 11 may be understood with reference to the foregoing description of the method for supporting remote user equipment mobility. The functions of the units in the apparatus for supporting mobility of a remote user equipment shown in fig. 11 may be implemented by a program running on a processor or by specific logic circuits.
Fig. 12 is a schematic diagram ii of a structure of an apparatus for supporting mobility of a remote user equipment according to an embodiment of the present invention, as shown in fig. 12, where the apparatus includes:
a second receiving unit 1201, configured to receive mobility-related information sent by a remote UE;
an execution unit 1202 for performing mobility-related operations for a remote UE.
In an embodiment of the present invention, the mobility-related information includes at least one of:
direct connection indication information; relay instruction information; relay UE identification information; an access technology for remote UE access to relay UE; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; a target cell identification; a target base station identifier; cell identification information serving the target relay UE/connected relay UE; base station identification information serving the target relay UE/connected relay UE; PC5 link quality information between the remote UE and the relay UE, which is measured by the remote UE; uu link RRM measurement information of a serving cell and/or a neighboring cell measured by a remote UE; remote UE identity information.
In the embodiment of the present invention, the second receiving unit 1201 is further configured to receive mobility related information sent by the remote UE through a Uu interface; or receiving mobility related information sent by the relay UE through the Uu interface, wherein the mobility related information sent by the relay UE is received by the relay UE from the remote UE.
In the embodiment of the present invention, the second receiving unit 1201 is further configured to perform at least one of the following:
receiving mobility-related information from the remote UE through an RRC connection request message;
receiving mobility-related information from a remote UE through an RRC connection reestablishment message;
receiving mobility-related information from a remote UE through a sidelink UE information message;
receiving mobility-related information from a remote UE through a measurement report message;
and receiving the mobility related information from the remote UE through the newly added RRC message.
In the embodiment of the present invention, the execution unit 1202 is further configured to execute at least one of the following:
updating context information of the remote UE according to the received mobility related information;
transmitting communication configuration information to a remote UE;
transmitting communication configuration information to the relay UE;
transmitting mobility related information to an MME of a remote UE;
and initiating a switching flow for the remote UE.
Those skilled in the art will appreciate that the implementation functions of the units in the apparatus for supporting remote user equipment mobility shown in fig. 12 may be understood with reference to the foregoing description of the method for supporting remote user equipment mobility. The functions of the units in the apparatus for supporting mobility of a remote user equipment shown in fig. 12 may be implemented by a program running on a processor or by specific logic circuits.
The device for supporting the mobility of the remote user equipment shown in 11 above may be provided in the terminal, and the device for supporting the mobility of the remote user equipment shown in 12 above may be provided in the base station. Fig. 13 is a block diagram of a hardware structure of a terminal or a base station according to an embodiment of the present invention. As shown in fig. 13, one or more (only one is shown in the figure) processors 1301 (the processor 1301 may include, but is not limited to, a microprocessor MCU or a processing device such as a programmable logic device FPGA), a memory 1302 for storing data, and a transmission device 1303 for communication functions. It will be appreciated by those skilled in the art that the configuration shown in fig. 13 is merely illustrative and is not intended to limit the configuration of the apparatus of the embodiments of the present invention described above. For example, more or fewer components than shown in FIG. 13 may be included, or have a different configuration than shown in FIG. 13.
The memory 1302 may be used to store software programs and modules of application software, such as program instructions/modules corresponding to the method for supporting mobility of a remote user equipment in the embodiment of the present invention, and the processor 1301 executes the software programs and modules stored in the memory 304, thereby performing various functional applications and data processing, i.e. implementing the above-mentioned method. Memory 1302 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, memory 1302 may further include memory located remotely from processor 1301, which may be connected to mobile terminal 30 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The transmitting device 1303 is used to receive or transmit data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of a terminal or a base station. In one example, the transmission device 1303 includes a network adapter (Network Interface Controller, simply referred to as NIC) that can connect to other network devices through a base station so as to communicate with the internet. In one example, the transmitting device 1303 may be a Radio Frequency (RF) module, which is used to communicate with the internet in a wireless manner.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow or block of the flowchart illustrations or block diagrams, and combinations of flows or blocks in the flowchart illustrations or block diagrams, 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, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows or block diagram block or blocks.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention.

Claims (37)

1. A method of supporting mobility for a remote user equipment, the method comprising:
the method comprises the steps that a remote User Equipment (UE) sends mobility related information to a base station so that the base station can execute mobility related operation for the remote UE;
The remote UE receives communication configuration information from a base station;
the mobility-related information includes at least one of:
direct connection indication information; relay instruction information; relay UE identification information; an access technology for remote UE access to relay UE; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; a target cell identification; a target base station identifier; cell identification information serving the target relay UE/connected relay UE; base station identification information serving the target relay UE/connected relay UE; PC5 link quality information between the remote UE and the relay UE, which is measured by the remote UE; uu link Radio Resource Management (RRM) measurement information of a serving cell and/or a neighboring cell measured by a remote UE; remote UE identification information;
the relay UE identification information is the identification information of the relay UE connected with the remote UE, or the relay UE paired with the remote UE, or the relay UE associated with the remote UE, or the relay UE selected by the remote UE;
before the remote UE sends mobility related information to the base station, it includes at least one of:
The remote UE receives UE identification information allocated by the base station from the relay UE or the base station, wherein the UE identification information comprises one of the following components: the cell radio network temporary identifier C-RNTI, the S1 application protocol identifier S1APID, the X2 application protocol identifier X2 APID and the GPRS tunnel protocol tunnel endpoint identifier GTP TEID;
the remote UE receives cell identification information of its serving cell from the relay UE or the base station, said cell identification information comprising a cell global identifier NCGI and/or physical cell identifier PCI information.
2. The method of supporting mobility of a remote user equipment of claim 1, wherein the access technology for the remote UE to access the relay UE comprises one of: third generation partnership project 3GPP technology; non-third generation partnership project non-3GPP technology; unilateral communication sidelink communication; wireless local area network WiFi; bluetooth.
3. The method for supporting mobility of a remote user equipment according to claim 1, wherein before the remote UE transmits mobility-related information to the base station, the method further comprises:
the remote UE receives mobility measurement threshold value information configured by the base station through a system message or a Radio Resource Control (RRC) special signaling; or the remote UE obtains the mobility measurement threshold value information in a preconfigured mode.
4. A method of supporting mobility for a remote user equipment as recited in claim 3, wherein said mobility measurement threshold information comprises at least one of:
a PC5 link measurement threshold value;
the RRM of the serving cell measures the threshold value;
the PC5 link measures the offset.
5. The method for supporting mobility for a remote user equipment as recited in claim 4, wherein before the remote UE transmits the mobility-related information to the base station, the method further comprises at least one of:
the PC5 link quality measured value between the remote UE and the relay UE is larger than or equal to the PC5 link measured threshold value;
the PC5 link quality measured value between the remote UE and the relay UE is smaller than or equal to the PC5 link measured threshold value;
the RRM measured value of the serving cell is smaller than or equal to the RRM measured threshold value of the serving cell;
the RRM measured value of the serving cell is larger than or equal to the RRM measured threshold value of the serving cell;
the value obtained by subtracting the PC5 link quality measurement value between the remote UE and the service relay UE from the PC5 link quality measurement value between the remote UE and the adjacent relay UE is larger than or equal to the PC5 link measurement offset.
6. A method of supporting mobility for a remote user equipment according to claim 3, wherein the remote UE receives the mobility measurement threshold information from the base station over a Uu interface; or the remote UE receives the mobility measurement threshold value information forwarded by the relay UE and received from the base station from the relay UE through the PC5 interface.
7. The method for supporting mobility of a remote user equipment according to claim 1, wherein the remote UE transmits mobility-related information to the base station, comprising:
the remote UE sends mobility related information to the base station through a Uu interface; or the remote UE sends the mobility related information to the relay UE, and the relay UE sends the mobility related information to the base station.
8. The method for supporting mobility of a remote user equipment according to claim 1, wherein the remote UE transmits mobility-related information to the base station, comprising at least one of:
the remote UE sends mobility related information to the base station through an RRC connection request message;
the remote UE sends mobility related information to the base station through an RRC connection reestablishment message;
the remote UE sends mobility related information to the base station through a unilateral link user equipment information sidelink UE information message;
the remote UE sends mobility related information to the base station through a measurement report message;
and the remote UE sends the mobility related information to the base station through the new RRC message.
9. The method for supporting mobility of a remote user equipment according to claim 8, wherein the remote UE transmits mobility-related information to the base station through an RRC connection request message, comprising:
The remote UE includes cause value indication information in the RRC connection request message, where the cause value indication information is used to indicate that the remote UE changes from a mode of being accessed by the relay UE to a mode of being accessed by the base station, or changes from a mode of being accessed by the base station to a mode of being accessed by the relay UE, and/or a serving base station of the remote UE is unchanged, and/or a serving base station of the remote UE is changed.
10. The method for supporting mobility of a remote user equipment according to claim 8, wherein the remote UE transmits mobility-related information to the base station through an RRC connection reestablishment message, comprising:
the remote UE includes cause value indication information in the RRC connection reestablishment message, where the cause value indication information is used to indicate that the remote UE changes from a mode of being accessed by the relay UE to a mode of being accessed by the base station, or changes from a mode of being accessed by the base station to a mode of being accessed by the relay UE, and/or a serving base station of the remote UE is unchanged, and/or a serving base station of the remote UE is changed.
11. The method for supporting mobility of a remote user equipment according to claim 1, wherein the remote UE receives the communication configuration information from the base station, comprising:
The remote UE receives communication configuration information from a base station through a Uu interface; alternatively, the remote UE receives communication configuration information from the relay UE, the communication configuration information being received by the relay UE from the base station.
12. The method of supporting mobility for a remote user equipment of claim 11, wherein the communication configuration information comprises at least one of:
direct connection indication information; relay instruction information; relay UE identification information; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; the PC5 carries configuration information; PC5 resource configuration information; uu carries configuration information; carrying mapping configuration information; PC5 connection release information; remote UE identity information.
13. The method for supporting mobility for a remote user equipment as recited in claim 12, wherein said bearer mapping configuration information comprises at least one of:
the mapping relation between EPS bearing/Uu bearing of the evolution grouping system and PC5 interface bearing;
the mapping relation between the PC5 interface bearing and the evolved packet system EPS bearing/Uu interface bearing;
Mapping relation between Uu interface logic channels and PC5 interface logic channels;
mapping relation between the PC5 interface logic channel and Uu interface logic channel.
14. The method for supporting mobility of a remote user equipment according to claim 13, wherein the mapping relationship between the PC5 interface bearer and the evolved packet system EPS bearer/Uu interface bearer is a PPPP-QCI mapping table, or a QCI for the PC5 interface-a QCI mapping table for the Uu interface; the mapping relation between EPS bearing/Uu interface bearing of the evolution grouping system and PC5 interface bearing is a QCI-PPPP mapping table or a QCI-QCI mapping table for the Uu interface and the PC5 interface.
15. The method for supporting mobility of a remote user equipment of claim 11, wherein after the remote UE receives the communication configuration information from the base station, the method further comprises at least one of:
the remote UE initiates a PC5 connection establishment process to the relay UE;
the remote UE initiates a PC5 connection release process to the relay UE;
the remote UE communicates through the relay function of the relay UE;
the remote UE directly communicates through the base station;
the remote UE sends mobility related information to the MME of the remote UE.
16. The method of supporting mobility of a remote user equipment according to claim 1, wherein the remote UE transmits mobility related information to an MME of the remote UE, so that the MME of the remote UE updates a context of the remote UE according to the received mobility related information.
17. A method of supporting mobility for a remote user equipment, the method comprising:
the base station receives mobility related information sent by remote UE;
the base station executes mobility related operation for the remote UE;
the mobility-related information includes at least one of:
direct connection indication information; relay instruction information; relay UE identification information; an access technology for remote UE access to relay UE; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; a target cell identification; a target base station identifier; cell identification information serving the target relay UE/connected relay UE; base station identification information serving the target relay UE/connected relay UE; PC5 link quality information between the remote UE and the relay UE, which is measured by the remote UE; uu link Radio Resource Management (RRM) measurement information of a serving cell and/or a neighboring cell measured by a remote UE; remote UE identification information;
the relay UE identification information is the identification information of the relay UE connected with the remote UE, or the relay UE paired with the remote UE, or the relay UE associated with the remote UE, or the relay UE selected by the remote UE;
Before the remote UE sends mobility related information to the base station, the method includes at least one of:
the remote UE receives UE identification information allocated by the base station from the relay UE or the base station, wherein the UE identification information comprises one of the following components: the cell radio network temporary identifier C-RNTI, the S1 application protocol identifier S1AP ID, the X2 application protocol identifier X2 AP ID, and the GPRS tunnel protocol tunnel endpoint identifier GTP TEID;
the remote UE receives cell identification information of its serving cell from the relay UE or the base station, said cell identification information comprising a cell global identifier NCGI and/or physical cell identifier PCI information.
18. The method of supporting mobility of a remote user equipment of claim 17, wherein the access technology for the remote UE to access the relay UE comprises one of: 3GPP technology; non-3GPP technology; sidelink communication; wiFi; bluetooth.
19. The method for supporting mobility of a remote user equipment as recited in claim 17, wherein the base station receiving mobility-related information sent by the remote UE comprises:
the base station receives mobility related information sent by remote UE through Uu interface; or, the base station receives mobility related information sent by the relay UE through the Uu interface, where the mobility related information sent by the relay UE is received by the relay UE from the remote UE.
20. The method for supporting mobility of a remote user equipment as recited in claim 17 wherein the base station receiving mobility-related information sent by the remote UE comprises at least one of:
the base station receives the mobility related information from the remote UE through the RRC connection request message;
the base station receives the mobility related information from the remote UE through the RRC connection reestablishment message;
the base station receives the mobility related information from the remote UE through sidelink UE information message;
the base station receives the mobility related information from the remote UE through the measurement report message;
the base station receives the mobility-related information from the remote UE through the newly added RRC message.
21. The method of supporting mobility for a remote user equipment of claim 17, wherein the base station performs mobility-related operations for the remote UE comprising at least one of:
the base station updates the context information of the remote UE according to the received mobility related information;
the base station sends communication configuration information to remote UE;
the base station sends communication configuration information to relay UE;
the base station sends mobility related information to an MME of a remote UE;
and the base station initiates a switching flow for the remote UE.
22. The method of supporting mobility of a remote user equipment of claim 21, wherein the communication configuration information comprises at least one of:
direct connection indication information; relay instruction information; relay UE identification information; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; the PC5 carries configuration information; PC5 resource configuration information; uu carries configuration information; carrying mapping configuration information; PC5 connection release information; remote UE identity information.
23. The method of supporting mobility of a remote user equipment according to claim 21, wherein the base station transmits mobility related information to an MME of a remote UE, so that the MME of the remote UE updates a context of the remote UE according to the received mobility related information.
24. The method for supporting mobility of a remote user equipment according to claim 21, wherein the base station initiates a handover procedure for the remote UE, comprising: the base station transmits mobility-related information to a target base station or a serving base station of the target relay UE, wherein the mobility-related information transmitted by the base station to the target base station or the serving base station of the target relay UE is the same as or different from the mobility-related information received from the remote UE.
25. The method for supporting mobility of a remote user equipment according to claim 24, wherein the base station transmitting mobility-related information to a target base station or a serving base station of a target relay UE, comprises:
the base station sends mobility related information to a target base station or a service base station of a target relay UE through an X2 switching request message of an X2 interface; or the base station sends the mobility related information to the MME through a handover required message of the S1 interface, and the MME sends the mobility related information to the target base station or a serving base station of the target relay UE through a handover request message of the S1 interface.
26. The method of supporting mobility of a remote user equipment according to claim 17, wherein after the base station transmits mobility-related information to a target base station or a serving base station of a target relay UE, the method further comprises at least one of:
the base station receives communication configuration information sent by the target base station or a service base station of the target relay UE;
the target base station or the service base station of the target relay UE sends communication configuration information to the relay UE;
the target base station or the service base station of the target relay UE transmits communication configuration information to the remote UE;
And the target base station or the serving base station of the target relay UE transmits the mobility related information to the MME of the remote UE.
27. The method for supporting mobility of a remote user equipment as recited in claim 26 wherein said base station, after receiving communication configuration information sent by said target base station, comprises at least one of:
the base station sends communication configuration information to remote UE;
and the base station sends communication configuration information to the relay UE.
28. An apparatus for supporting mobility for a remote user equipment, the apparatus comprising:
a transmitting unit, configured to transmit mobility-related information to a base station, so that the base station performs mobility-related operations for a remote UE;
a first receiving unit configured to receive communication configuration information from a base station;
the mobility-related information includes at least one of:
direct connection indication information; relay instruction information; relay UE identification information; an access technology for remote UE access to relay UE; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; a target cell identification; a target base station identifier; cell identification information serving the target relay UE/connected relay UE; base station identification information serving the target relay UE/connected relay UE; PC5 link quality information between the remote UE and the relay UE, which is measured by the remote UE; uu link Radio Resource Management (RRM) measurement information of a serving cell and/or a neighboring cell measured by a remote UE; remote UE identification information;
The relay UE identification information is the identification information of the relay UE connected with the remote UE, or the relay UE paired with the remote UE, or the relay UE associated with the remote UE, or the relay UE selected by the remote UE;
the transmitting unit includes at least one of the following before transmitting mobility related information to the base station:
the remote UE receives UE identification information allocated by the base station from the relay UE or the base station, wherein the UE identification information comprises one of the following components: the cell radio network temporary identifier C-RNTI, the S1 application protocol identifier S1APID, the X2 application protocol identifier X2 APID and the GPRS tunnel protocol tunnel endpoint identifier GTP TEID;
the remote UE receives cell identification information of its serving cell from the relay UE or the base station, said cell identification information comprising a cell global identifier NCGI and/or physical cell identifier PCI information.
29. The apparatus for supporting mobility of a remote user equipment according to claim 28, wherein said first receiving unit is further configured to receive mobility measurement threshold information configured by a base station through a system message or RRC dedicated signaling; or obtaining the mobility measurement threshold value information in a preconfigured mode.
30. The apparatus for supporting mobility of a remote user equipment according to claim 28, wherein said transmitting unit is further configured to transmit mobility-related information to a base station through a Uu interface; or, the mobility related information is sent to the relay UE, and the mobility related information is sent to the base station through the relay UE.
31. The apparatus for supporting mobility of a remote user equipment of claim 28, wherein the sending unit is further configured to perform at least one of:
transmitting mobility related information to the base station through an RRC connection request message;
transmitting mobility related information to the base station through an RRC connection reestablishment message;
transmitting mobility-related information to the base station through a sidelink UE information message;
transmitting mobility-related information to the base station through a measurement report message;
and sending the mobility related information to the base station through the new RRC message.
32. The apparatus for supporting mobility of a remote user equipment of claim 28, wherein the first receiving unit is further configured to receive UE identification information allocated thereto by a base station from a relay UE or a base station, the UE identification information comprising one of: C-RNTI, S1 AP ID, X2 AP ID, GTP TEID;
the first receiving unit is further configured to receive cell identification information of a serving cell of the relay UE or the base station from the relay UE or the base station, where the cell identification information includes a cell global identifier ECGI and/or physical cell identifier PCI information.
33. The apparatus for supporting mobility of a remote user equipment of claim 28, wherein the first receiving unit is further configured to receive communication configuration information from a base station over a Uu interface; alternatively, communication configuration information is received from the relay UE, the communication configuration information being received from the base station by the relay UE.
34. An apparatus for supporting mobility for a remote user equipment, the apparatus comprising:
a second receiving unit, configured to receive mobility related information sent by a remote UE;
an execution unit for executing mobility-related operations for the remote UE;
the mobility-related information includes at least one of:
direct connection indication information; relay instruction information; relay UE identification information; an access technology for remote UE access to relay UE; carrying information to be forwarded; the control plane forwards the indication information; the user plane forwards the indication information; the control plane and the user plane forward the indication information; uplink forwarding indication information; downlink forwarding indication information; uplink and downlink forwarding indication information; a target cell identification; a target base station identifier; cell identification information serving the target relay UE/connected relay UE; base station identification information serving the target relay UE/connected relay UE; PC5 link quality information between the remote UE and the relay UE, which is measured by the remote UE; uu link Radio Resource Management (RRM) measurement information of a serving cell and/or a neighboring cell measured by a remote UE; remote UE identification information;
the relay UE identification information is the identification information of the relay UE connected with the remote UE, or the relay UE paired with the remote UE, or the relay UE associated with the remote UE, or the relay UE selected by the remote UE;
Wherein before the remote UE sends mobility related information to the apparatus, at least one of the following is included:
the remote UE receives UE identification information allocated by the base station from the relay UE or the base station, wherein the UE identification information comprises one of the following components: the cell radio network temporary identifier C-RNTI, the S1 application protocol identifier S1APID, the X2 application protocol identifier X2 APID and the GPRS tunnel protocol tunnel endpoint identifier GTP TEID;
the remote UE receives cell identification information of its serving cell from the relay UE or the base station, said cell identification information comprising a cell global identifier NCGI and/or physical cell identifier PCI information.
35. The apparatus for supporting mobility of a remote user equipment according to claim 34, wherein said second receiving unit is further configured to receive mobility-related information sent by a remote UE through a Uu interface; or receiving mobility related information sent by the relay UE through the Uu interface, wherein the mobility related information sent by the relay UE is received by the relay UE from the remote UE.
36. The apparatus for supporting mobility of a remote user equipment of claim 34, wherein the second receiving unit is further configured to perform at least one of:
Receiving mobility-related information from the remote UE through an RRC connection request message;
receiving mobility-related information from a remote UE through an RRC connection reestablishment message;
receiving mobility-related information from a remote UE through a sidelink UE information message;
receiving mobility-related information from a remote UE through a measurement report message;
and receiving the mobility related information from the remote UE through the newly added RRC message.
37. The apparatus for supporting mobility of a remote user equipment of claim 34, wherein the execution unit is further configured to perform at least one of:
updating context information of the remote UE according to the received mobility related information;
transmitting communication configuration information to a remote UE;
transmitting communication configuration information to the relay UE;
transmitting mobility related information to an MME of a remote UE;
and initiating a switching flow for the remote UE.
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