KR-102962327-B1 - METHOD AND APPARATUS FOR MANAGING MOBILITY IN COMMUNICATION SYSTEM

KR102962327B1KR 102962327 B1KR102962327 B1KR 102962327B1KR-102962327-B1

Abstract

In one embodiment of a communication system, a method of operation of a relay terminal comprises: receiving a first area identifier for a first area corresponding to the first base station from a first base station to which the relay terminal is connected; generating a first virtual area identifier distinct from the first area identifier; transmitting the first virtual area identifier to a first remote terminal connected to the first base station through relaying of the relay terminal; performing a first area update procedure triggered based on the first virtual area identifier at the first remote terminal; and storing a first temporary identifier obtained based on the first area update procedure, wherein the first temporary identifier may be used for a paging procedure for the first remote terminal.

Inventors

송재수

Assignees

한국전자통신연구원

Dates

Publication Date: 20260508
Application Date: 20230324
Priority Date: 20220325

Claims (20)

As a method of operation of a relay terminal, A step of receiving a first area identifier for a first area corresponding to the first base station from the first base station to which the relay terminal is connected; A step of generating a first virtual area identifier distinct from the first area identifier above; A step of transmitting the first virtual area identifier to a first remote terminal connected to the first base station through the relay of the relay terminal; A step of performing a first area update procedure triggered based on the first virtual area identifier at the first remote terminal; and It includes the step of storing a first temporary identifier obtained based on the above first area update procedure, The above first temporary identifier is used for a paging procedure for the above first remote terminal, Method of operation of a relay terminal.
In claim 1, The step of performing the above-mentioned first area update procedure is: A step of receiving a first request message for the first area update procedure from the first remote terminal; A step of transmitting a second request message to the first base station based on the received first request message; A step of receiving a first response message in response to the second request message at the first base station; A step of transmitting a second response message to the first remote terminal based on the first response message; and The method comprises the step of receiving the first temporary identifier obtained by the first remote terminal based on the second response message from the first remote terminal. Method of operation of a relay terminal.
In claim 2, The second request message above includes a plurality of temporary identifiers pre-configured for each of the plurality of remote terminals connected to the first base station through the relay of the relay terminal, and the plurality of remote terminals include the first remote terminal. Method of operation of a relay terminal.
In claim 1, The method of operation of the above relay terminal is, After the step of storing the first temporary identifier, the step of moving to a second base station included in a second area different from the first area; A step of receiving a second area identifier for the second area from the second base station; A step of transmitting the first virtual domain identifier again to the first remote terminal; A step of performing a second area update procedure triggered by the relay terminal based on the received second area identifier; and The method further includes the step of storing a second temporary identifier obtained by the relay terminal based on the second area update procedure described above, The second temporary identifier above is an identifier newly assigned for the paging procedure for the first remote terminal, Method of operation of a relay terminal.
In claim 4, The step of performing the above second area update procedure is: A step of determining whether the second area update procedure is required based on the second area identifier; If it is determined that the above second area update procedure is necessary, a step of generating a second request message; A step of transmitting the generated second request message to the second base station; A step of receiving a first response message in response to the second request message at the second base station; and A step comprising obtaining the second temporary identifier included in the first response message, Method of operation of a relay terminal.
In claim 1, The method of operation of the above relay terminal is, After the step of storing the first temporary identifier, the step of performing a third area update procedure triggered based on a first periodic timer at the first remote terminal; and It further includes the step of storing a third temporary identifier received from the first remote terminal based on the third area update procedure above, The above third temporary identifier is an identifier newly assigned for the paging procedure for the above first remote terminal, Method of operation of a relay terminal.
In claim 1, The method of operation of the above relay terminal is, After the step of storing the first temporary identifier, the method further includes the step of deleting the stored first temporary identifier based on a second period timer. Method of operation of a relay terminal.
In claim 1, The method of operation of the above relay terminal is, A step of receiving an RRC release message for a second remote terminal in an RRC connection state that is connected to the first base station through the relay of the relay terminal; A step of transmitting the received RRC release message to the second remote terminal; The step of the second remote terminal receiving a fourth temporary identifier obtained from the second remote terminal based on the RRC release message; and It further includes the step of storing the above-mentioned fourth temporary identifier, The above-mentioned fourth temporary identifier is used for the paging procedure for the above-mentioned second remote terminal, Method of operation of a relay terminal.
In claim 1, Each of the above first and second areas is a TA (tracking area), each of the above first and second area identifiers is a TAI (TA identifier), the above first virtual area identifier is a V-TAI (virtual-TAI), and each of the above first and second area update procedures is a TAU (TA update) procedure, Method of operation of a relay terminal.
In claim 1, Each of the first and second regions is a Radio Access Network (RAN) notification area, each of the first and second region identifiers is a RAI (RAN area identifier), the first virtual region identifier is a V-RAI (virtual-RAI), and each of the first and second region update procedures is an RNAU (RNA update) procedure, Method of operation of a relay terminal.
As a method of operation of the first base station, A step of transmitting a first area identifier for a first area corresponding to the first base station to a first relay terminal connected to the first base station; and The method includes the step of transmitting a first temporary identifier to the first relay terminal based on a first area update procedure triggered at a first remote terminal connected to the first base station through the relay of the first relay terminal, and The above first area update procedure is triggered at the first remote terminal as the first remote terminal receives a first virtual area identifier that is distinct from the first area identifier generated at the first relay terminal, and The above first temporary identifier is used for a paging procedure for the above first remote terminal, Method of operation of the first base station.
In claim 11, The step of transmitting the first temporary identifier above is, The step of receiving a second request message transmitted from the first relay terminal based on a first request message for the first area update procedure received by the first remote terminal; and A method comprising the step of transmitting a first response message including the first temporary identifier in response to the second request message. Method of operation of the first base station.
In claim 12, The second request message above includes a plurality of temporary identifiers pre-configured for each of the plurality of remote terminals connected to the first base station through the relay of the first relay terminal, and the plurality of remote terminals include the first remote terminal. Method of operation of the first base station.
In claim 12, Each of the first and second areas is a TA (tracking area), each of the first and second area identifiers is a TAI (TA identifier), the first virtual area identifier is a V-TAI (virtual-TAI), and each of the first and second area update procedures is a TAU (TA update) procedure. The step of transmitting a first response message including the first temporary identifier is: Based on the second request message above, the step of transmitting a third request message to the core network to which the first base station is connected; A step of receiving a second response message from the core network, in response to the third request message, the second response message including the first temporary identifier set for the first remote terminal; and A step comprising transmitting the first response message, which includes the first temporary identifier included in the second response message, to the first remote terminal. Method of operation of the first base station.
In claim 12, Each of the first and second areas is a Radio Access Network (RAN) notification area, each of the first and second area identifiers is a RAI (RAN area identifier), the first virtual area identifier is a V-RAI (virtual-RAI), and each of the first and second area update procedures is an RNAU (RNA update) procedure. The step of transmitting a first response message including the first temporary identifier is: A step of setting the first temporary identifier for the first remote terminal based on the second request message; and A step comprising transmitting to the first remote terminal the first response message including the first temporary identifier set for the first remote terminal. Method of operation of the first base station.
In claim 11, The method of operation of the first base station above is, After the step of transmitting the first temporary identifier, the method includes the step of transmitting a second temporary identifier to the first relay terminal based on a second area update procedure triggered based on a first periodic timer at the first remote terminal. The second temporary identifier above is an identifier newly assigned for the paging procedure for the first remote terminal, Method of operation of the first base station.
As a relay terminal, It includes a processor, The above processor is the above relay terminal: The above relay terminal receives a first area identifier for a first area corresponding to the first base station from the first base station to which it is connected; Generate a first virtual area identifier distinct from the above first area identifier; The above first virtual area identifier is transmitted to a first remote terminal connected to the first base station through the relay of the above relay terminal; Performing a first area update procedure triggered based on the first virtual area identifier at the first remote terminal; and It operates to cause the storage of a first temporary identifier obtained based on the above first area update procedure, and The above first temporary identifier is used for a paging procedure for the above first remote terminal, Relay terminal.
In claim 17, When performing the above first area update procedure, the processor is the relay terminal: Receiving a first request message for the first area update procedure from the first remote terminal; Based on the received first request message, transmit a second request message to the first base station; The first base station receives a first response message in response to the second request message; Based on the first response message above, a second response message is transmitted to the first remote terminal; and The above first remote terminal operates to further cause the above first remote terminal to receive the above first temporary identifier obtained based on the above second response message from the above first remote terminal. Relay terminal.
In claim 17, The above processor is the above relay terminal: After storing the first temporary identifier, move to a second base station included in a second area different from the first area; Receive a second area identifier for the second area from the second base station; The first virtual domain identifier is transmitted again to the first remote terminal; Based on the received second area identifier, the relay terminal performs a second area update procedure triggered by the relay terminal; and It operates to further cause the relay terminal to store the second temporary identifier obtained based on the second area update procedure above, and The above second temporary identifier is an identifier newly assigned for the paging procedure for the above first remote terminal, Relay terminal.
In claim 17, The above processor is the above relay terminal: After storing the first temporary identifier, the first remote terminal performs a third area update procedure triggered based on a first periodic timer; and It operates to further cause storing a third temporary identifier received from the first remote terminal based on the above third area update procedure, and The above third temporary identifier is an identifier newly assigned for the paging procedure for the above first remote terminal, Relay terminal.

Description

Method and apparatus for managing mobility in a communication system The present disclosure relates to mobility management technology in a communication system, and more specifically, to technology for improving the efficiency of mobility management procedures in communication between a base station, a relay terminal, and a remote terminal. Along with the advancement of information and communication technology, various wireless communication technologies are being developed. Representative wireless communication technologies include LTE (long term evolution) and NR (new radio), which are defined in the 3GPP (3rd generation partnership project) standards. LTE can be one of the wireless communication technologies among 4G (4th Generation) wireless communication technologies, and NR can be one of the wireless communication technologies among 5G (5th Generation) wireless communication technologies. Wireless communication technologies beyond 5G (such as 6G (6th Generation), etc.) can be referred to as B5G (beyond 5G) wireless communication technologies. In a wireless communication environment, mutually adjacent terminals can perform communication via a sidelink through mutual discovery procedures, procedures for establishing mutual sidelinks, and procedures for transmitting resource information and data by utilizing sidelink resources in the sidelink. Mutually adjacent terminals can perform direct communication via the sidelink, and sidelink control and configuration procedures can be carried out through functions included in the communication network, such as a sidelink server. Based on this, some of the mutually adjacent terminals can operate as relay terminals, and others can operate as remote terminals connected to a base station through the relay terminals. In one embodiment of a communication system, the mobility of one or more remote terminals connected to a base station via a relay terminal may be dependent on the mobility of the relay terminal. For example, if a procedure for managing the mobility of a relay terminal, such as a handover, is performed as the relay terminal moves, signaling operations for corresponding mobility management may also be required for each of the one or more remote terminals. If such signaling operations for managing the mobility of the relay terminal and the one or more remote terminals are performed almost simultaneously, a significant load may be placed on the network. Technology may be required to improve the efficiency of the mobility management procedure for the relay terminal and the one or more remote terminals. The matters described in this background section are provided to enhance understanding of the background of the present disclosure and may include matters that are not prior art already known to those skilled in the art to which this technology belongs. FIG. 1 is a conceptual diagram illustrating an embodiment of a communication system. FIG. 2 is a block diagram illustrating an example of a communication node constituting a communication system. FIG. 3 is a conceptual diagram illustrating an embodiment of a mobility management method based on a tracking area (TA) in a communication system. FIG. 4 is a conceptual diagram illustrating an example of a TA identifier (TA Identifier, TAI) format in a communication system. FIG. 5 is a flowchart illustrating an example of a TA Update (TAU) procedure in a communication system. FIG. 6 is a flowchart illustrating an example of a Radio Access Network (RAN) Notification Area Update (RNAU) procedure in a communication system. FIGS. 7a to 7c are conceptual diagrams for illustrating embodiments of a side-link-based relay scenario in a communication system. FIG. 8 is a conceptual diagram illustrating an embodiment of a communication system that supports a side-link based relay. FIGS. 9a and 9b are conceptual diagrams illustrating an embodiment of a sidelink-based mobile relay technology in a communication system. FIGS. 10a and FIGS. 10b are conceptual diagrams illustrating embodiments of an L2 (Layer 2) relay protocol structure in a communication system. FIG. 11 is a conceptual diagram illustrating an example of an L3 (Layer 3) relay protocol structure in a communication system. FIGS. 12a and FIGS. 12b are conceptual diagrams for explaining an embodiment of the wireless access protocol structure of each remote terminal and relay terminal in a communication system. FIG. 13 is a flowchart illustrating an example of a mobility management procedure for a remote terminal in an idle state in a communication system. FIG. 14 is a flowchart illustrating an example of a mobility management procedure for a remote terminal in an inactive state in a communication system. FIG. 15 is a flowchart illustrating an example of a mobility management procedure for a remote terminal in a connected state in a communication system. FIG. 16 is a flowchart illustrating a first embodiment of a relay UE-based mobility management procedure in a communicatio