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Wireless connection control method, distributed unit, centralized unit, and base station system

專利號(hào)
US11160124B2
公開日期
2021-10-26
申請(qǐng)人
HUAWEI TECHNOLOGIES CO., LTD.（CN Shenzhen）
發(fā)明人
Rui Wang; Mingzeng Dai; Xudong Yang; Hongzhuo Zhang
IPC分類
H04W4/00; H04W76/11; H04W76/27; H04W72/00; H04W74/08
技術(shù)領(lǐng)域
bearer,unit,terminal,message,identifier,signaling,plane,rrc,in,connection
地域： Guangdong

摘要

This application provides a wireless connection control method relating to a base station system including a centralized unit and a distributed unit, wherein the centralized unit communicates with the distributed unit, and the distributed unit communicates with a terminal through an air interface. The method includes: first receiving, by the distributed unit, a first message sent by the terminal, where the first message is used to request to establish an air interface control plane connection for the terminal; then sending, by the distributed unit, the first message to the centralized unit; and then receiving, by the distributed unit, a second message sent by the centralized unit, where the second message is used to instruct to establish the air interface control plane connection between the terminal and the distributed unit. The method may implement wireless connection control in a 5G system when functions of a base station are separated.

說(shuō)明書

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of International Application No. PCT/CN2018/085745, filed on May 5, 2018, which claims priority to Chinese Patent Application No. 201710313783.2 filed on May 5, 2017. The disclosures of the aforementioned applications are hereby incorporated by reference in their entireties.

TECHNICAL HELD

This application relates to communications technologies, and in particular, to a wireless connection control method, a distributed unit, a centralized unit, and a base station system.

BACKGROUND

In the 5th generation mobile communications (5G) system, a base station may include a centralized unit (CU) and a distributed unit (DU). To be specific, functions of a base station in an original access network are split, some functions of the base station are deployed in the CU, and remaining functions are deployed in the DU. A plurality of DUs share one CU. This can reduce costs and facilitate network scalability. A CU-DU split may be based on a protocol stack. In a possible manner, a Radio Resource Control (RRC) layer and a Packet Data Convergence Protocol (PDCP) layer are deployed in the CU, and a Radio Link Control (RLC) layer, a Media Access Control (MAC) layer, and a physical layer are deployed in the DU.

權(quán)利要求

1
What is claimed is:1. A system, comprising: a distributed unit and a centralized unit;wherein the distributed unit is configured to:receive a radio resource control (RRC) connection request from a terminal;send a control plane message comprising the RRC connection request to the centralized unit through a control plane connection between the distributed unit and the centralized unit, wherein the control plane message comprising the RRC connection request further comprises:a first terminal identifier of the terminal,an identifier of a cell accessed by the terminal, anda second terminal identifier of the terminal,wherein the first terminal identifier identifies the terminal on an air interface, and the second terminal identifier is an identifier allocated by the distributed unit for the terminal on the control plane connection;receive through the control plane connection from the centralized unit, a control plane message comprising an RRC connection establishment message, wherein the control plane message comprising the RRC connection establishment message further comprises a third terminal identifier of the terminal, wherein the third terminal identifier is an identifier allocated by the centralized unit for the terminal on the control plane connection; andsend the RRC connection establishment message to the terminal.2. The system according to claim 1, wherein the distributed unit is configured to:receive an RRC connection establishment complete message from the terminal; andsend the RRC connection establishment complete message to the centralized unit and wherein the central unit is configured to:receive through the control plane connection from the distributed unit, the control plane message comprising the RRC connection request,send the control plane message comprising the RRC connection establishment message to the distributed unit through the control plane connection; andreceive the RRC connection establishment complete message from the distributed unit.3. The system according to claim 1, wherein the distributed unit is configured to:receive a random access request from the terminal; andsend a random access response to the terminal, wherein the random access response comprises the first terminal identifier of the terminal.4. The system according to claim 1, wherein the first terminal identifier of the terminal is allocated by the distributed unit.5. The system according to claim 1, wherein the first terminal identifier of the terminal is a cell radio network temporary identifier (C-RNTI).6. The system according to claim 1, wherein the distributed unit and the centralized unit are comprised in a base station;the distributed unit is configured to employ a radio link control (RLC) layer function of the base station, a media access control (MAC) layer function of the base station and a physical layer function of the base station; andthe centralized unit is configured to employ an RRC layer function of the base station and a packet data convergence protocol (PDCP) layer function of the base station.7. A method, comprising:receiving, by a distributed unit, a radio resource control (RRC) connection request sent by a terminal;sending, by the distributed unit, a control plane message comprising the RRC connection request to a centralized unit through a control plane connection between the distributed unit and the centralized unit, wherein the control plane message comprising the RRC connection request further comprises:a first terminal identifier of the terminal,an identifier of a cell accessed by the terminal, anda second terminal identifier of the terminal,wherein the first terminal identifier identifies the terminal on an air interface, and the second terminal identifier is an identifier allocated by the distributed unit for the terminal on the control plane connection;receiving, by the distributed unit through the control plane connection, a control plane message that is sent by the centralized unit and that comprises an RRC connection establishment message, wherein the control plane message comprising the RRC connection establishment message further comprises a third terminal identifier of the terminal, wherein the third terminal identifier is an identifier allocated by the centralized unit for the terminal on the control plane connection; andsending, by the distributed unit, the RRC connection establishment message to the terminal.8. The method according to claim 7, further comprising:receiving, by the distributed unit, an RRC connection establishment complete message sent by the terminal; andsending, by the distributed unit, the RRC connection establishment complete message to the centralized unit.9. The method according to claim 7, wherein the method further comprises:establishing, by the distributed unit, the control plane connection.10. The method according to claim 7, wherein the method further comprises:receiving, by the distributed unit, a random access request from the terminal; andsending, by the distributed unit, a random access response to the terminal, wherein the random access response comprises the first terminal identifier of the terminal.11. The method according to claim 7, wherein the first terminal identifier of the terminal is allocated by the distributed unit.12. The method according to claim 7, wherein the first terminal identifier of the terminal is a cell radio network temporary identifier (C-RNTI).13. The method according to claim 7, wherein the distributed unit and the centralized unit are comprised in a base station;the distributed unit is configured to employ a radio link control (RLC) layer function of the base station, a media access control (MAC) layer function of the base station and a physical layer function of the base station; andthe centralized unit is configured to employ an RRC layer function of the base station and a packet data convergence protocol (PDCP) layer function of the base station.14. A wireless connection control method, comprising:receiving, by a centralized unit through a control plane connection between the centralized unit and a distributed unit, a control plane message that comprising a radio resource control (RRC) connection request from the distributed unit, wherein the control plane message comprising the RRC connection request further comprises:a first terminal identifier of a terminal,an identifier of a cell accessed by the terminal, anda second terminal identifier of the terminal,wherein the first terminal identifier identifies the terminal on an air interface, and the second terminal identifier is an identifier allocated by the distributed unit for the terminal on the control plane connection;sending, by the centralized unit, a control plane message comprising an RRC connection establishment message to the distributed unit through the control plane connection, wherein the control plane message comprising the RRC connection establishment message further comprises a third terminal identifier of the terminal, wherein the third terminal identifier is an identifier allocated by the centralized unit for the terminal on the control plane connection; andreceiving, by the centralized unit, an RRC connection establishment complete message from the distributed unit.15. The method according to claim 14, wherein the first terminal identifier of the terminal is a cell radio network temporary identifier (C-RNTI).16. The method according to claim 14, wherein the distributed unit and the centralized unit are comprises in a base station;the distributed unit is configured to employ a radio link control, RLC, layer function of the base station, a media access control, MAC, layer function of the base station and a physical layer function of the base station; andthe centralized unit is configured to employ an RRC layer function of the base station and a packet data convergence protocol (PDCP) layer function of the base station.17. An apparatus, comprising at least one memory storing program instructions; and at least one processor, wherein the program instructions enable the at least one processor to:receive a radio resource control (RRC) connection request from a terminal;send a control plane message comprising the RRC connection request to a centralized unit through a control plane connection between the apparatus and the centralized unit, wherein the control plane message comprising the RRC connection request further comprises:a first terminal identifier of the terminal,an identifier of a cell accessed by the terminal, anda second terminal identifier of the terminal,wherein the first terminal identifier identifies the terminal on an air interface, and the second terminal identifier is an identifier allocated by the apparatus for the terminal on the control plane connection;receive through the control plane connection from the centralized unit, a control plane message comprising an RRC connection establishment message, wherein the control plane message comprising the RRC connection establishment message further comprises a third terminal identifier of the terminal, wherein the third terminal identifier is an identifier allocated by the centralized unit for the terminal on the control plane connection; andsend the RRC connection establishment message to the terminal.18. The apparatus according to claim 17, wherein the program instructions further enable the at least one processor to:receive an RRC connection establishment complete message from the terminal; andsend the RRC connection establishment complete message to the centralized unit.19. The apparatus according to claim 17, wherein the program instructions further enable the at least one processor to:receive a random access request from the terminal; andsend a random access response to the terminal, wherein the random access response comprises the first terminal identifier of the terminal.20. The apparatus according to claim 17, wherein the first terminal identifier of the terminal is allocated by the apparatus.21. The apparatus according to claim 17, wherein the first terminal identifier of the terminal is a cell radio network temporary identifier (C-RNTI).22. The apparatus according to claim 17, wherein the apparatus and the centralized unit are comprised in a base station;the apparatus is configured to employ a radio link control (RLC) layer function of the base station, a media access control (MAC) layer function of the base station and a physical layer function of the base station; andthe centralized unit is configured to employ an RRC layer function of the base station and a packet data convergence protocol (PDCP) layer function of the base station.23. An apparatus, comprising at least one memory having a storing program instructions and at least one processor, wherein the program instructions enable the at least one processor to:receive through a control plane connection between the apparatus and a distributed unit, a control plane message comprising a radio resource control (RRC) connection request from the distributed unit, wherein the control plane message comprising the RRC connection request further comprises:a first terminal identifier of a terminal,an identifier of a cell accessed by the terminal, anda second terminal identifier of the terminal,wherein the first terminal identifier identifies the terminal on an air interface, and the second terminal identifier is an identifier allocated by the distributed unit for the terminal on the control plane connection;send a control plane message comprising an RRC connection establishment message to the distributed unit through the control plane connection, wherein the control plane message comprising the RRC connection establishment message further comprises a third terminal identifier of the terminal, wherein the third terminal identifier is an identifier allocated by the apparatus for the terminal on the control plane connection; andreceive an RRC connection establishment complete message from the distributed unit.24. The apparatus according to claim 23, wherein the first terminal identifier of the terminal is a cell radio network temporary identifier (C-RNTI).25. The apparatus according to claim 23, wherein the distributed unit and the apparatus are comprised in a base station;the distributed unit is configured to employ a radio link control (RLC) layer function of the base station, a media access control (MAC) layer function of the base station and a physical layer function of the base station; andthe apparatus is configured to employ an RRC layer function of the base station and a packet data convergence protocol (PDCP) layer function of the base station.
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