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KR-102961808-B1 - Handover method and device, terminal device and network device

KR102961808B1KR 102961808 B1KR102961808 B1KR 102961808B1KR-102961808-B1

Abstract

The present application discloses a handover method and apparatus, a terminal apparatus, and a network apparatus. The handover method comprises receiving a first message transmitted by a source cell, wherein the first message instructs the relay terminal to hand over to a target cell, and the first message includes target configuration information of the target cell, wherein the target configuration information includes first configuration information of the relay terminal and second configuration information at the Uu interface of the data of the remote terminal, and wherein the remote terminal is a remote terminal under the relay terminal; and connecting to the target cell according to the target configuration information.

Inventors

  • 리우 지아민
  • 리우 양

Assignees

  • 비보 모바일 커뮤니케이션 컴퍼니 리미티드

Dates

Publication Date
20260507
Application Date
20210510
Priority Date
20200513

Claims (20)

  1. A relay terminal receives a first message transmitted by a source cell, wherein the first message instructs the relay terminal to hand over to a target cell, and the first message includes target configuration information of the target cell, wherein the target configuration information includes first configuration information of the relay terminal and second configuration information at the Uu interface of the data of the remote terminal, and the remote terminal is a remote terminal under the relay terminal; and The above relay terminal includes the step of connecting to the target cell according to the target configuration information, and A handover method wherein the first configuration information of the relay terminal includes third configuration information at the Uu interface of the target cell of the relay terminal and first PC5 interface configuration information at the target cell of the relay terminal, wherein the third configuration information includes upper layer portion configurations of the data radio bearer (DRB) and the signaling radio bearer (SRB) at the Uu interface of the relay terminal, and the first sidelink interface configuration information includes configuration information of the sidelink interface between the relay terminal and the remote terminal.
  2. In paragraph 1, The first configuration information of the relay terminal includes third configuration information at the Uu interface of the target cell of the relay terminal and first site link interface configuration information at the target cell of the relay terminal; A handover method comprising the step of the relay terminal connecting to the target cell according to the target configuration information, wherein the relay terminal connects to the target cell according to the third configuration information and performs a reconfiguration of the side link interface according to the first side link interface configuration information.
  3. In paragraph 1, After the relay terminal receives the first message transmitted by the source cell, A handover method further comprising the step of the relay terminal transmitting second sidelink interface configuration information to the remote terminal via a first sidelink wireless resource control (RRC) message, wherein the second sidelink interface configuration information is the sidelink interface configuration information of the remote terminal.
  4. In paragraph 1, After the relay terminal receives the first message transmitted by the source cell, A handover method comprising the step of the relay terminal transmitting a notification to the remote terminal, wherein the notification instructs the relay terminal to hand over to the target cell.
  5. In paragraph 1, The above first message further includes operation instructions for the PDCP entity; After the relay terminal receives the first message transmitted by the source cell, The above relay terminal further includes the step of performing a PDCP reconstruction process or a PDCP data recovery operation in accordance with the operation instructions of the PDCP entity; The PDCP reconstruction process includes any one of PDCP reconstruction corresponding to the data of the relay terminal, PDCP reconstruction corresponding to the data of the relay terminal, and PDCP reconstruction corresponding to the data of the remote terminal; The above PDCP data recovery operation is a handover method comprising any one of PDCP data recovery corresponding to the data of the relay terminal, PDCP data recovery corresponding to the data of the relay terminal, and PDCP data recovery corresponding to the data of the remote terminal.
  6. In paragraph 1, After connecting to the above target cell, The above relay terminal transmits instruction information to the above remote terminal, wherein the instruction information indicates that the relay terminal has already connected to the target cell; The step of the relay terminal receiving a reconstruction completion signaling transmitted by the remote terminal; A handover method further comprising the step of the relay terminal transmitting the reconfiguration completion signaling to the target cell.
  7. In paragraph 1, The above relay terminal receives a reconfiguration completion signaling transmitted by a remote terminal, wherein the remote terminal is a remote terminal under the relay terminal; and A handover method further comprising the step of, after connecting to the target cell, the relay terminal transmitting the reconfiguration completion signaling to the target cell.
  8. In paragraph 1, Before the relay terminal receives the first message transmitted by the source cell, A step in which the above relay terminal performs a measurement according to target measurement configuration information; and A handover method further comprising the step of the relay terminal reporting measurement information to the source cell when a reporting condition is satisfied.
  9. A network device transmits a first message to a relay terminal, wherein the first message instructs the relay terminal to hand over to a target cell, and the first message includes target configuration information of the target cell, wherein the target configuration information includes first configuration information of the relay terminal and second configuration information at the Uu interface of the data of the remote terminal, and the remote terminal is a remote terminal under the relay terminal; A handover method wherein the first configuration information of the relay terminal includes third configuration information at the Uu interface of the target cell of the relay terminal and first PC5 interface configuration information at the target cell of the relay terminal, wherein the third configuration information includes upper layer portion configurations of the data radio bearer (DRB) and the signaling radio bearer (SRB) at the Uu interface of the relay terminal, and the first sidelink interface configuration information includes configuration information of the sidelink interface between the relay terminal and the remote terminal.
  10. In Paragraph 9, A handover method comprising: first configuration information of the relay terminal, third configuration information at the Uu interface of the target cell of the relay terminal, and first site link interface configuration information at the target cell of the relay terminal.
  11. In Paragraph 9, A handover method further comprising the step of the network device transmitting a second message to the remote terminal, wherein the second message includes fourth configuration information in the target cell of the remote terminal.
  12. A step in which a remote terminal obtains fifth configuration information in a target cell of the remote terminal; and The above remote terminal includes a step of reconfiguring the sidelink interface through the relay terminal according to the above fifth configuration information, and The step of obtaining fifth configuration information in a target cell of the remote terminal comprises the step of obtaining the fifth configuration information from the relay terminal after the relay terminal receives a first message transmitted by a source cell, wherein the first message instructs the relay terminal to hand over to the target cell, and the first message includes target configuration information of the target cell, and the target configuration information includes first configuration information of the relay terminal and second configuration information in the Uu interface of the data of the remote terminal, and the remote terminal is a remote terminal under the relay terminal; A handover method wherein the first configuration information of the relay terminal includes third configuration information at the Uu interface of the target cell of the relay terminal and first PC5 interface configuration information at the target cell of the relay terminal, wherein the third configuration information includes upper layer portion configurations of the data radio bearer (DRB) and the signaling radio bearer (SRB) at the Uu interface of the relay terminal, and the first sidelink interface configuration information includes configuration information of the sidelink interface between the relay terminal and the remote terminal.
  13. In Paragraph 12, After the above remote terminal performs reconfiguration on the sidelink interface through the relay terminal according to the above fifth configuration information, A step in which the remote terminal transmits a reconfiguration completion signaling to the relay terminal; After receiving a notification message transmitted by the relay terminal, the remote terminal transmits a reconfiguration completion signaling to the target cell, wherein the notification message indicates that the relay terminal has already connected to the target cell; and A handover method further comprising any one of the steps of the remote terminal transmitting a reconfiguration completion signaling to the target cell.
  14. The apparatus comprises a memory, a processor, and a program or instruction stored in the memory and executable by the processor, and when the program or instruction is executed by the processor, A step of the method according to any one of paragraphs 1 through 8; or A terminal device in which a step of the method according to any one of paragraphs 12 to 13 is implemented.
  15. A network device comprising a memory, a processor, and a program or instruction stored in the memory and executable by the processor, wherein when the program or instruction is executed by the processor, a step of the method according to any one of claims 9 to 11 is implemented.
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Description

Handover method and device, terminal device and network device The present invention relates to the field of communication, and in particular to a handover method and device, a terminal device and a network device. The present application claims priority to Chinese patent application No. 202010403977.3 filed in China on May 13, 2020, and may include all of the contents thereof. In a Long Term Evolution (LTE) system, a sidelink is used to transmit data directly between User Equipment (UE) devices without a network device. LTE sidelink is applied to specific public safety issues (e.g., emergency communications at disaster sites such as fires or earthquakes) or Vehicle to Everything (V2X) communications. V2X communications include various services, such as basic security type communications, advanced (autonomous) driving, formation, and sensor extension. Since LTE sidelink only supports broadcast communication, it is used only for basic security type communications, while other advanced V2X services requiring strict QoS in terms of latency and safety are supported via NR sidelink. 5G NR systems can be used for working bandwidths of 6 GHz or higher that LTE does not support, and can support larger working bandwidths, but current versions of NR systems only support interfaces between base stations and terminals and do not yet support sidelink interfaces for direct communication between terminals. Sidelink interfaces can also be referred to as PC5 interfaces. Current sidelink transmissions can be primarily classified into several transmission formats, such as broadcast, groupcast, and unicast. Unicast is a one-to-one transmission. Currently, sidelink unicast and multicast communication support the physical layer HARQ feedback mechanism. In related technology, the resource allocation modes of Sidelink UEs are all classified into two types. Base station scheduling mode (Mode 1): The network-side device (base station) is responsible for allocating resources to each UE. UE Autonomous Mode (Mode 2): Each UE independently selects resources. In a typical sidelink relay scenario, the remote UE transmits data to the base station via the sidelink between the remote UE and the relay UE. In this scenario, data transmission takes place between the remote UE and the relay UE, and the relay UE performs the data forwarding function. Related technologies do not provide a technical solution for handing over UEs in relay scenarios, resulting in service interruptions for remote UEs and a degraded user experience. FIG. 1 is a schematic diagram of one flow of a handover method according to an embodiment of the present application. FIG. 2 is a schematic diagram of another flow of a handover method according to an embodiment of the present application. FIG. 3 is a schematic diagram of another flowchart of a handover method according to an embodiment of the present application. FIG. 4 is a schematic diagram of another flowchart of a handover method according to an embodiment of the present application. FIG. 5 is a schematic diagram of another flowchart of a handover method according to an embodiment of the present application. FIG. 6 is a schematic diagram of one structure of a handover device according to an embodiment of the present application. FIG. 7 is a schematic diagram of another structure of a handover device according to an embodiment of the present application. FIG. 8 is a schematic diagram of another structural form of a handover device according to an embodiment of the present application. FIG. 9 is a schematic diagram of the structure of a terminal device according to an embodiment of the present application. FIG. 10 is a schematic diagram of the structure of a network device according to an embodiment of the present application. The drawings described herein are intended to aid in a further understanding of the present invention and constitute part of the present invention; exemplary embodiments and descriptions thereof are for the purpose of explaining the present invention and are not intended to limit the present invention. With reference to the drawings in the embodiments of the present application below, a clear and complete description of the technical methods in the embodiments of the present application will be provided. It is obvious that the described embodiments are merely some embodiments of the present invention and not all embodiments. All other embodiments obtained by those skilled in the art without requiring creative effort through the embodiments of the present invention should be considered to fall within the scope of the present invention. The technical solution of the present invention can be applied to various communication systems, for example, Global System of Mobile communication (GSM), Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system/Long Term Evolution Advanced (LTE-A) system,