WO2018157740A1 - 无线接入网络系统及集中单元 - Google Patents

无线接入网络系统及集中单元 Download PDF

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WO2018157740A1
WO2018157740A1 PCT/CN2018/076560 CN2018076560W WO2018157740A1 WO 2018157740 A1 WO2018157740 A1 WO 2018157740A1 CN 2018076560 W CN2018076560 W CN 2018076560W WO 2018157740 A1 WO2018157740 A1 WO 2018157740A1
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protocol
unit
user plane
pdcp
plane unit
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PCT/CN2018/076560
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English (en)
French (fr)
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徐岱
郑涛
袁知贵
姚强
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中兴通讯股份有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/12—Reselecting a serving backbone network switching or routing node
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/10—Reselecting an access point controller
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/165—Performing reselection for specific purposes for reducing network power consumption

Definitions

  • the present disclosure relates to the field of communications, for example, to a wireless access network system and a centralized unit.
  • the 3GPP 3rd Generation Partnership Project
  • CU/DU Central Unit, Distributed Unit and Distributed Unit
  • the scheme performs function splitting on the basis of the E-UTRA (Evolved Universal Terrestrial Radio Access) protocol stack, and the segmentation method is as shown in FIG. 1 .
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • FIG. 1 Through flexible splitting of RAN functions, it can better meet a variety of different 5G service requirements; it can also save network construction costs and operating costs, and better collaborate and coordinate between cells and between DUs. Improve system capacity and spectrum efficiency, better load management, and optimized performance.
  • the CU and DU are two independent logical units that can be deployed independently.
  • the CU is an interface anchor between the access network and the core network, and the CU and the CN (core network) are connected through a CN-RAN interface.
  • the DU is a logical unit that connects the CU and the RF (Radio Frequency) unit.
  • One CU can be connected to multiple DUs, and the CU is connected to multiple DUs through a CU-DU interface.
  • There are a variety of different function division methods between the CU and the DU Each function division has different requirements for the preamble interface, and the network networking requirements and the inter-cell collaboration capabilities are different.
  • the present disclosure provides a radio access network system and a centralized unit, which can solve the problem that the CU and DU functions are not clearly defined in the related art.
  • a radio access network system including: a radio access network system including a central unit CU and a distributed unit DU; a CU including a control plane unit and a user plane unit; and a control plane unit for processing The control plane protocol, the user plane unit is used to process the user plane protocol.
  • a CU is provided, the centralized unit CU includes a control plane unit and a user plane unit; the control plane unit is for processing a control plane protocol, and the user plane unit is for processing a user plane protocol.
  • This embodiment provides flexible segmentation and flexible deployment between the CU and the DU, which can obtain the benefits of separation of the control plane and the user plane, meet the 5G business requirements, and improve the QOE (Quality of Experience).
  • FIG. 1 is a schematic diagram of functional splitting of a CU/DU in the related art
  • FIG. 2 is a functional division of a CU/DU and a control plane and a user plane in an embodiment
  • FIG. 3 is a schematic diagram of splitting a CU/DU function for splitting between RRC and PDCP in an embodiment
  • FIG. 4 is a schematic diagram of splitting a CU/DU function for splitting between a PDCP and an RLC in an embodiment
  • FIG. 5 is a schematic diagram of splitting of a CU/DU function for splitting between a High RLC and a Low RLC in an embodiment
  • FIG. 6 is a schematic diagram of splitting a CU/DU function for splitting between an RLC and a MAC in an embodiment
  • FIG. 7 is a schematic diagram of splitting of a CU/DU function for splitting between a High MAC and a Low MAC in an embodiment.
  • the division and allocation of functions between the CU and the DU requires consideration of transmission conditions and service types, loads, and densities between the CU and the DU. Among them, the transmission conditions also need to consider the requirements of delay, jitter, bandwidth and synchronization. Measures for dividing CUs and DUs based on the above factors are not involved in the related art.
  • the radio access network system includes a central unit CU and a distributed unit DU.
  • the CU includes a control plane unit (abbreviated as CU-C) and a user plane unit (abbreviated as CU-U).
  • the control plane unit is used to process the control plane protocol.
  • the user plane unit is used to process the user plane protocol.
  • the DU is used to process the underlying protocol in addition to the protocol handled by the CU. Communication can be performed between a plurality of units having a connection relationship shown in FIG. 2.
  • the CU-C and the CU-U may be separately (ie, independent) deployed with the DU, that is, the CU-C and the DU may be in different physical locations, and the CU-U and the DU may be in the Different physical locations.
  • the option 1 of the CU/DU architecture that is, the LSP and the PDCP are split, and before the severing, the RRC in the RAN is deployed in the CU, and the PDCP, the RLC, and the MAC are deployed.
  • the DU the user plane protocol stack between the UE and the RAN is in the DU, and the user plane interface GTPU between the RAN and the next generation core (NG core) network is in the CU-U.
  • NG core next generation core
  • the SCP (signaling radio bearer, signaling bearer) and the DRB (Data Radio Bearer) of the PDCP are used.
  • the data radio bearer (referred to as data bearer) is separated, so that the SRB of the PDCP is deployed in the CU-C, and the DRB of the PDCP is in the DU. As shown in FIG.
  • the CU-C is used to process the SRB, the RRM protocol, and the RRC protocol of the PDCP
  • the DU is used to process the DRB, the RLC (Radio Link Control, Radio Link Control) protocol, and the MAC (Media Access Control, Media) of the PDCP.
  • Access control protocol and PHY physical layer
  • the processing method of the present example can enable the RAN system to perform RRC and RRM in a centralized manner, and the user plane can perform distributed processing. Moreover, in the scenario of low latency demand, the distributed processing of user data can be closer to the user, thereby improving the user experience and reducing the consumption of delay and backward transmission.
  • option 2 of the CU/DU architecture that is, splitting between PDCP and RLC, RRC and PDCP in the RAN are deployed in the CU before the severing; and RLC and MAC are deployed in the DU. in.
  • the SRB, RRC, and RRM of the PDCP are deployed in the CU-C, and the DRB of the PDCP is deployed in the CU-U.
  • the DU is used to process the RLC protocol, the MAC protocol, and the PHY protocol.
  • the processing method of this example can perform data convergence processing at the PDCP layer, and can perform lossless and seamless movement in a mobility scenario.
  • Option 3 of the CU/DU architecture that is, splitting between high RLC (High RLC) and low RLC (Low RLC), as shown in FIG. 5, after splitting, CU-C is used to process SRB of PDCP, The RRM protocol and the RRC protocol, the CU-U is used to process the data bearer of the PDCP and the High RLC protocol, and the DU is used to process the Low RLC protocol, the MAC protocol, and the PHY protocol.
  • Option 4 for the CU/DU architecture that is, splitting between the RLC and the MAC, as shown in FIG. 6, the CU-C is used to process the SCP, the RRM protocol, and the RRC protocol of the PDCP, for CU-U.
  • the DU is used to process the MAC protocol and the PHY protocol.
  • Option 5 for the CU/DU architecture that is, splitting between High MAC and Low MAC, as shown in Figure 7, after splitting, CU-C is used to process PDCP SRB, RRM protocol, and RRC protocol, CU- The U user plane unit is used to process the PDCP data bearer, the RLC protocol, and the High MAC protocol, and the DU is used to process the Low MAC and PHY protocols.
  • the splitting of option 6, option 7, and option 8 of the CU/DU architecture may be to sequentially move the RLC, MAC, and PHY in the lower DU as shown in FIG. 3 to the CU-C.
  • the process of dividing the option 3, the option 4, and the option 5 of the CU/DU architecture may be referred to, and details are not described herein again.
  • control plane unit is configured to process a signaling bearer of a packet data convergence protocol PDCP, a radio resource management RRM protocol, and a radio resource control RRC protocol.
  • the DU is configured to process a PDCP data bearer, a radio link layer control RLC protocol, a multiple access control MAC protocol, and a physical layer PHY protocol.
  • the user plane unit is arranged to process a data bearer of the PDCP, the DU being arranged to process the RLC protocol, the MAC protocol, and the PHY protocol.
  • the user plane unit is arranged to process the data bearer of the PDCP and the RLC protocol, the DU being arranged to process the MAC protocol and the PHY protocol.
  • the user plane unit is configured to process a data bearer of the PDCP, an RLC protocol, and a MAC protocol, the DU being set to process the PHY protocol.
  • the user plane unit is configured to process the data bearer of the PDCP, the RLC protocol, the MAC protocol, and the PHY protocol.
  • the present embodiment relates to a radio access technology in a 5G network architecture, an improvement in function partitioning and cooperation between a CU (central unit) and a DU (distributed unit) of the RAN, and an improvement in separation of control plane and user plane functions.
  • the embodiment provides a centralized unit and a distributed unit DU, wherein the centralized unit is a CU in the RAN system, and the centralized unit is divided into a control plane unit (CU-C) and a user plane unit (CU-U).
  • the control plane unit is used to process the control plane protocol
  • the user plane unit is used to process the user plane protocol.
  • the DU is used to process the underlying protocol other than the protocol processed by the CU.
  • the DU is used to process the RLC protocol, the MAC protocol, and the PHY protocol.
  • the CU-C is used to process the signaling bearer of the PDCP, the radio resource management RRM protocol, and the radio resource control RRC protocol, where the user plane unit is configured to process the PDCP data bearer; on this basis, the user plane unit can also At least one of the RLC protocol, the MAC protocol, and the PHY protocol is divided into processes to be processed by the CU-U.
  • the flexible segmentation and flexible deployment between the CU and the DU are provided, and the benefits of separating the control plane and the user plane are obtained, which satisfies the 5G different service requirements and improves the quality of experience (QoE) of the user. .
  • the units described in the above embodiments may be stored in a computer readable storage medium. All or part of the technical solutions of the above embodiments may be embodied in the form of a computer software product, a hardware product or a combination of a software product and a hardware product, the computer software product being stored in a storage medium, comprising a plurality of instructions for making one
  • the computer device (which may be a cell phone, a personal computer, a server or a network device, etc.) performs all or part of the steps of the method described in the above embodiments.
  • the foregoing storage medium includes: a U disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk, and the like, which can store program code. .
  • the present disclosure provides flexible segmentation and flexible deployment between the CU and the DU, and can obtain the benefits of separation of the control plane and the user plane, satisfies the 5G different business requirements, and improves the user's QOE.

Abstract

一种无线接入网络系统，包括：集中单元CU以及分布式单元DU；其中，CU包括控制面单元以及用户面单元；控制面单元用于处理控制面协议，用户面单元用于处理用户面协议。

Description

无线接入网络系统及集中单元 技术领域
本公开涉及通讯领域，例如涉及一种无线接入网络系统及集中单元。
背景技术
在5G RAN(Radio Access Network，无线接入网络)架构方面，3GPP(3rd Generation Partnership Project，第三代合作伙伴计划)通过了CU/DU(Central Unit，集中单元和Distributed Unit分布式单元)的架构方案，在E-UTRA(Evolved Universal Terrestrial Radio Access，演进通用陆地无线接入)协议栈的基础上进行了功能切分(split)，切分方法如图1所示。通过对RAN功能的灵活拆分，可以更好的满足各种各样、千差万别的5G业务需求；还可以节约建网成本和运营成本，以及能够更好地对小区间以及DU间进行协作和协调，提升系统容量和频谱效率，能更好的进行负荷管理，性能得到了优化。
CU与DU是两个独立的逻辑单元，可以独立部署。CU是接入网和核心网之间的接口锚点，CU与CN(core network，核心网)之间通过CN-RAN接口连接。DU是连接CU和RF(Radio Frequency，射频)单元的逻辑单元。一个CU可以与多个DU进行连接，CU通过CU-DU接口与多个DU进行连接。CU和DU之间可以有多种不同的功能划分方法，每一种功能划分对前传接口的要求都不一样，对网络的组网要求和小区间的协作能力的要求也不一样。
发明内容
本公开提供一种无线接入网络系统及集中单元，可以解决相关技术中未对CU和DU功能进行明确划分的问题。
根据本公开的一个方面，提供了一种无线接入网络系统，包括：无线接入网络系统包括集中单元CU以及分布式单元DU；CU包括控制面单元以及用户面单元；控制面单元用于处理控制面协议，用户面单元用于处理用户面协议。
根据本公开的另一个方面，提供了一种CU，该集中单元CU包括控制面单元以及用户面单元；控制面单元用于处理控制面协议，用户面单元用于处理用户面协议。
本实施例提供了CU与DU之间的灵活切分以及灵活部署，能够获取控制面和用户面分离的收益，满足了5G千差万别的业务需求，提升用户的QOE(Quality of Experience，体验质量)。
附图概述
图1是相关技术中CU/DU的功能拆分示意图；
图2是一实施例中CU/DU以及控制面和用户面的功能划分；
图3是一实施例中对RRC和PDCP之间进行切分的CU/DU功能拆分示意图；
图4是一实施例中对PDCP和RLC之间进行切分的CU/DU功能拆分示意图；
图5是一实施例中对High RLC和Low RLC之间进行切分的CU/DU功能拆分示意图；
图6是一实施例中对RLC与MAC之间进行切分的CU/DU功能拆分示意图；
图7是一实施例中对High MAC与Low MAC之间进行切分的CU/DU功能拆分示意图。
具体实施方式
CU和DU之间的功能划分和分配，需要考虑CU和DU之间的传输条件和业务类型、负荷以及密度等因素。其中，传输条件还需要考虑时延、抖动、带宽以及同步等要求。相关技术中并未涉及到基于以上因素而对CU和DU进行划分的措施。
本实施例提供了一种无线接入网络系统，如图2所示，该无线接入网络系统包括集中单元CU以及分布式单元DU。CU包括控制面单元(简称为CU-C)以及用户面单元(简称为CU-U)。控制面单元用于处理控制面协议。用户面单元用于处理用户面协议。DU用于处理除CU处理的协议之外的底层协议。图2中所示的具有连接关系的多个单元之间可以进行通信。
在本实施例中，CU-C以及CU-U可以分别与DU进行分离的(即独立的)部署，即，CU-C与DU可以处于不同的物理位置，以及，CU-U与DU可以处于不同的物理位置。
在一个实例中，对CU/DU架构的选项(option)1，即对RRC和PDCP之间进行切分，在进行切分之前，RAN中的RRC部署在CU中，而PDCP、RLC以及MAC部署在DU中。此时，UE和RAN之间的用户面协议栈均在DU中，RAN和下一代核心(NG core)网之间的用户面接口GTPU在CU-U中。在该实例中，为了兼顾RRC和PDCP之间的安全性和基于RRC和PDCP的性能的提升，将PDCP的SRB(signaling radio bearer，信令无线承载，简称信令承载)和DRB(Data Radio Bearer，数据无线承载，简称数据承载)进行分离，使得PDCP的SRB部署在CU-C中，而PDCP的DRB在DU。如图3所示，CU-C用于处理PDCP的SRB、RRM协议以及RRC协议，DU用于处理PDCP的DRB、RLC(Radio Link Control，无线链路控制)协议、MAC(Media Access Control，媒体访问控制)协议以及PHY(physical layer，物理层)协议。对于RRC和PDCP之间的拆分方法，可以类似于DC(Dual Connectivity，双链接)架构中的1A架构。本实例的处理方法可以使得RAN系统可以集中的进行RRC和RRM，而用户面可以分布式的处理。且，在低时延需求的场景下，用户数据分布式处理可以更靠近用户，进而提高用户体验，减少时延以及后向传输的消耗。
在另一个实例中，对CU/DU架构的选项2，即对PDCP和RLC之间进行切分，在进行切分之前，RAN中的RRC和PDCP部署在CU中；而RLC和MAC部署在DU中。为了兼顾控制功能和用户功能分离以及CU和DU单元分离，如图4所示，在本实例中，将PDCP的SRB、RRC以及RRM部署在CU-C，以及PDCP的DRB部署在CU-U，DU用于处理RLC协议、MAC协议以及PHY协议，本实例的处理方法可以在PDCP层进行数据会聚处理，且在移动性场景下，可以做到无损和无缝的移动。
对CU/DU架构的选项3，即对高RLC(High RLC)和低RLC(Low RLC)之间进行切分，可以如图5所示，切分后CU-C用于处理PDCP的SRB、RRM协议以及RRC协议，CU-U用于处理PDCP的数据承载以及High RLC协议，DU用于处理Low RLC协议、MAC协议以及PHY协议。对CU/DU架构的选项4，即对RLC与MAC之间进行切分，可以如图6所示，切分后CU-C用于处理PDCP的SRB、RRM协议以及RRC协议，CU-U用于处理PDCP的数据承载和RLC协议，DU用于处理MAC协议、PHY协议。对CU/DU架构的选项5，即对High MAC与Low MAC之间进行切分，可以如图7所示，切分后CU-C用于处理PDCP的SRB、RRM协议以及RRC协议，CU-U用户面单元用于处理PDCP 的数据承载、RLC协议和High MAC协议，DU用于处理Low MAC和PHY协议。基于上述记载，对CU/DU架构的选项6、选项7以及选项8进行切分可以是将如图3中所示的下侧的DU中的RLC、MAC以及PHY依次移至CU-C中即可，可以参照上述对CU/DU架构的选项3、选项4以及选项5进行切分的过程，此处不再赘述。
在一实施例中，所述控制面单元设置为处理分组数据汇聚协议PDCP的信令承载、无线资源管理RRM协议以及无线资源控制RRC协议。
在一实施例中，所述DU设置为处理PDCP的数据承载、无线链路层控制RLC协议、多路访问控制MAC协议以及物理层PHY协议。
在一实施例中，所述用户面单元设置为处理PDCP的数据承载，所述DU设置为处理所述RLC协议、MAC协议以及PHY协议。
在一实施例中，所述用户面单元设置为处理PDCP的数据承载以及RLC协议，所述DU设置为处理MAC协议以及PHY协议。
在一实施例中，所述用户面单元设置为处理PDCP的数据承载、RLC协议以及MAC协议，所述DU设置为处理PHY协议。
在一实施例中，所述用户面单元设置为处理PDCP的数据承载、RLC协议、MAC协议以及PHY协议。
本实施例涉及5G网络架构中的无线接入技术，关于RAN的CU(集中单元)与DU(分布式单元)之间的功能划分和协作的改进，以及控制面和用户面功能分离的改进。
本实施例提供了一种集中单元以及分布式单元DU，其中，集中单元即RAN系统中的CU，该集中单元被划分为控制面单元(CU-C)以及用户面单元(CU-U)。其中，控制面单元用于处理控制面协议，用户面单元用于处理用户面协议。DU用于处理除CU处理的协议之外的底层协议，示例性的，DU用于处理RLC协议、MAC协议以及PHY协议等。
在一个实例中，CU-C用于处理PDCP的信令承载、无线资源管理RRM协议以及无线资源控制RRC协议，用户面单元用于处理PDCP的数据承载；在此基础上，用户面单元还可以将RLC协议、MAC协议以及PHY协议中的至少一种协议划分为由该CU-U处理。
本实施例提供了CU与DU之间的灵活切分以及灵活部署，又能够获取控制 面和用户面分离的收益，满足了5G千差万别的业务需求，提升用户的体验质量(Quality of Experience，QoE)。
上述实施例中所述单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。上述实施例的技术方案的全部或部分可以以计算机软件产品，硬件产品或者软件产品和硬件产品结合的形式体现出来，该计算机软件产品存储在一个存储介质中，包括多个指令用以使得一台计算机设备(可为手机、个人计算机、服务器或者网络设备等)执行上述实施例中所述方法的全部或部分步骤。而前述的存储介质包括：U盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、移动硬盘、磁碟或者光盘等多种可以存储程序代码的介质。
工业实用性
本公开提供了CU与DU之间的灵活切分以及灵活部署，又能够获取控制面和用户面分离的收益，满足了5G千差万别的业务需求，提升用户的QOE。

Claims (10)

  1. 一种无线接入网络系统，包括：集中单元CU以及分布式单元DU；
    其中，所述CU包括控制面单元以及用户面单元；
    所述控制面单元设置为处理控制面协议，所述用户面单元设置为处理用户面协议。
  2. 根据权利要求1所述的系统，其中，所述控制面单元设置为处理分组数据汇聚协议PDCP的信令承载、无线资源管理RRM协议以及无线资源控制RRC协议。
  3. 根据权利要求2所述的系统，其中，所述DU设置为处理PDCP的数据承载、无线链路层控制RLC协议、多路访问控制MAC协议以及物理层PHY协议。
  4. 根据权利要求2所述的系统，其中，所述用户面单元设置为处理PDCP的数据承载，所述DU设置为处理所述RLC协议、MAC协议以及PHY协议。
  5. 根据权利要求2所述的系统，其中，所述用户面单元设置为处理PDCP的数据承载以及RLC协议，所述DU设置为处理MAC协议以及PHY协议。
  6. 根据权利要求2所述的系统，其中，所述用户面单元设置为处理PDCP的数据承载、RLC协议以及MAC协议，所述DU设置为处理PHY协议。
  7. 根据权利要求2所述的系统，其中，所述用户面单元设置为处理PDCP的数据承载、RLC协议、MAC协议以及PHY协议。
  8. 一种集中单元CU，包括控制面单元以及用户面单元；
    所述控制面单元设置为处理控制面协议，所述用户面单元设置为处理用户面协议。
  9. 根据权利要求8所述的CU，其中，所述控制面单元设置为处理分组数据汇聚协议PDCP的信令承载、无线资源管理RRM协议以及无线资源控制RRC协议，所述用户面单元设置为处理PDCP的数据承载。
  10. 根据权利要求9所述的CU，其中，所述用户面单元还设置为处理以下至少一种协议：无线链路层控制RLC协议、多路访问控制MAC协议以及物理层PHY协议。
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