5G信令会话管理分析指导书.doc

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1、5G信令会话管理分析指导书4.1 5G QoS Architecture4.2 PDU会话建立过程4.3 PDU会话修改过程4.4 PDU会话释放过程4.5 关键消息解读1.1 5G QoS Architecture1.1.1 概述QoS是业务网络传输质量的一种表述，更是业务传输质量保障的机制。QoS: Quality of Service，is the description or measurement of the overall performance of a service, such as a telephony or computer network or a cloud co

2、mputing service, particularly the performance seen by the users of the network. To quantitatively measure quality of service, several related aspects of the network service are often considered, such as packet loss, bit rate, throughput, transmission delay, availability, jitter, etc.5G SA 引入基于流（QoS

3、Flow）的QoS管理机制3GPP 23501 Figure 5.7.1.5-1: The principle for classification and User Plane marking for QoS Flows and mapping to AN Resourcesl 5G SA QoS架构主要特点： 基于QoS Flow进行端到端的QoS管理； NG-U呈现PDU Session/QoS Flow，不是E-RAB； 每个PDU Session内存在一条缺省QoS Flow及对应缺省QoS Rule贯穿整个生命周期 UE侧的QoS Rule可通过配置或反射式自学习获取；l 5G S

4、A QoS架构各角色分工： SMF：控制QoS Flow策略； UPF/UE：完成NAS层IP Flow到QoS Flow的映射（一级映射） gNB：完成AS层QoS Flow到DRB的映射（二级映射）1.1.2 QoS Flow基于流（QoS Flow）的QoS管理机制定义l QoS Flow是满足一组QoS质量配置（QoS profile）的端到端数据流；l QoS Flow是5G系统中最细的质量管理粒度；l 每个QoS Flow包含一个标识QoS Flow identifier (QFI) ，QFI取值（063）；l QoS质量配置包括若干QoS质量参数（QoS parameters）；

5、l gNB进行QoS Flow到DRB的映射，可以是多对一的映射关系，也可以是1:1的映射关系；1.1.3 QoS Parameters5G QoS质量特征（QoScharacteristics）解读简称全称含义取值范围生效范围适用业务LTE类比5QI5G QoS Identifier标量，用于表征一组质量特征0255QoS FlowQCIARPAllocation and Retention Priority包含优先级、抢占能力、可被抢占等信息；优先级定义了UE资源请求的重要性，在系统资源受限时，ARP参数决定了一个新的QoS流是被接受还是被拒绝。Priority Level: 115Pre

6、-emption Capability:Pre-emption Vulnerability:QoS FlowARPRQAReflective QoS Attribute指示了在该QoS Flow可以应用反射式QoSenabled/disabledQoS FlowNonGBRGFBRGuaranteed Flow Bit RateQoS Flow在Average window内统计的承诺速率0.4,000,000,000,000 bpsQoS FlowGBRGBRMFBRMaximum Flow Bit RateQoS Flow在Average window内统计的最大速率0.4,000,000

7、,000,000 bpsQoS FlowGBRMBRNCNotification controlgNB无法满足GFBR时是否通知核心网的标识enabled/disabledQoS FlowGBRMPLRMaximum Packet Loss RateQoS Flow可以忍受的最大丢包率01000QoS FlowGBR for voiceSession-AMBRSession Aggregate Maximum Bit RatesPDU Session内所有NonGBR QoS Flow的比特率之和的上限0.4,000,000,000,000 bpsPDU SessionNonGBRAPN-AM

8、BRUE-AMBRUE Aggregate Bit RatesUE内所有NonGBR QoS Flow的比特率之和的上限0.4,000,000,000,000 bpsUENonGBRUE-AMBRRTResource Type资源类型GBR, delay critical GBR or Non-GBRAllResource Type (GBR or NonGBR)PLPriority level表示QoS Flow间资源调度优先级；该参数用于区分一个UE内或不同UE间QoS Flow优先级，值越小表示优先级越高1127AllPDBPacket Delay BudgetUE到UPF的时延。除了D

9、elay Critical GBR业务，属“soft upper bound”，即使超限，仍需处理01023 (0.5 ms)AllPERPacket Error Rate误包率。含义为发送端链路层（RLC）已处理，但未能提交给对端上层协议（PDCP）。用于指导配置合适的链路层参数（RLC和HARQ参数）。x * 10-k (x,k: 09)AWAveraging WindowGFBR/MFBR的评估时长。04095 (ms)Default: 2000 msGBRMDBVMaximum Data Burst Volume最大突发数据量。表示在PDB内需要传输的最大数据量04095 ByteDe

10、lay-critical GBR典型业务5QI质量属性定义参见3GPP.23.501.Table 5.7.4-1：5QIValueResource TypeDefault Priority LevelPacket Delay BudgetPacket ErrorRateDefault Maximum Data Burst Volume(NOTE 2)DefaultAveraging WindowExample Services1GBR(NOTE 1)20100 ms10-2N/A2000 msConversational Voice240150 ms10-3N/A2000 msConversa

11、tional Video (Live Streaming)33050 ms10-3N/A2000 msReal Time Gaming, V2X messagesElectricity distribution medium voltage, Process automation - monitoring450300 ms10-6N/A2000 msNon-Conversational Video (Buffered Streaming)65775 ms10-2N/A2000 msMission Critical user plane Push To Talk voice (e.g., MCP

12、TT)6620100 ms10-2N/A2000 msNon-Mission-Critical user plane Push To Talk voice6715100 ms10-3N/A2000 msMission Critical Video user plane752550 ms10-2N/A2000 msV2X messages5Non-GBR(NOTE 1)10100 ms10-6N/AN/AIMS Signalling660300 ms10-6N/AN/AVideo (Buffered Streaming)TCP-based (e.g., www, e-mail, chat, ft

13、p, p2p file sharing, progressive video, etc.)770100 ms10-3N/AN/AVoice,Video (Live Streaming)Interactive Gaming880300 ms10-6N/AN/AVideo (Buffered Streaming)TCP-based (e.g., www, e-mail, chat, ftp, p2p file sharing, progressive990video, etc.)69560 ms10-6N/AN/AMission Critical delay sensitive signallin

14、g (e.g., MC-PTT signalling)7055200 ms10-6N/AN/AMission Critical Data (e.g. example services are the same as QCI 6/8/9)796550 ms10-2N/AN/AV2X messages806810 ms10-6N/AN/ALow Latency eMBB applications Augmented Reality82Delay Critical GBR1910 ms(NOTE 4)10-4255 bytes2000 msDiscrete Automation (see TS 22

15、.261 2)832210 ms(NOTE 4)10-41358 bytes(NOTE 3)2000 msDiscrete Automation (see TS 22.261 2)842430 ms(NOTE 6)10-51354 bytes2000 msIntelligent transport systems (see TS 22.261 2)85215 ms(NOTE 5)10-5255 bytes2000 msElectricity Distribution- high voltage (see TS 22.261 2)NOTE 1: A packet which is delayed

16、 more than PDB is not counted as lost, thus not included in the PER.NOTE 2: It is required that default MDBV is supported by a PLMN supporting the related 5QIs.NOTE 3: This MDBV value is set to 1354 bytes to avoid IP fragmentation for the IPv6 based, IPSec protected GTP tunnel to the 5G-AN node (the

17、 value is calculated as in Annex C of TS 23.060 56 and further reduced by 4 bytes to allow for the usage of a GTP-U extension header).NOTE 4: A delay of 1 ms for the delay between a UPF terminating N6 and a 5G-AN should be subtracted from a given PDB to derive the packet delay budget that applies to

18、 the radio interface.NOTE 5: A delay of 2 ms for the delay between a UPF terminating N6 and a 5G-AN should be subtracted from a given PDB to derive the packet delay budget that applies to the radio interface.NOTE 6: A delay of 5 ms for the delay between a UPF terminating N6 and a 5G-AN should be sub

19、tracted from a given PDB to derive the packet delay budget that applies to the radio interface.1.1.4 QoS Flow到DRB的映射QoS Flow到DRB映射规则（QoS Rule），由gNB配置，多条QoS Flow可以映射到同一个DRB。l gNB基于本地配置的策略确定QoS Flow到DRB的映射关系（QoS Rule）：l gNB将QoS Flow到DRB的映射关系（QoS Rule），同时配置给本端/UE端的对等的SDAP协议实体：3GPP 37324 Figure 4.2.2-1:

20、 SDAP layer, functional viewl gNB SDAP协议实体收到下行数据报文后，基于QoS Rule进行QoS Flow到DRB的映射转发：1.2 PDU会话建立过程步骤 1 AMF向gNB发送PDU SESSION RESOURCE SETUP REQUEST消息，携带需要建立的PDU会话列表、每个PDU会话的Qos Flow列表、以及每个Qos Flow的质量属性等；步骤 2 gNB根据Qos Flow的质量属性和MML界面配置的策略，将Qos Flow映射到DRB，向UE发送RRCReconfiguration消息，发起建立DRB承载；步骤 3 UE完成DRB承载

21、建立后，向gNB回复RRCReconfigurationComplte消息；步骤 4 gNB向AMF发送PDU SESSION RESOURCE SETUP RESPONSE消息，将成功建立的PDU Session信息写入PDU Session Resource Setup Response List信元中；-结束1.3 PDU会话修改过程步骤 1 AMF向gNB发送PDU SESSION RESOURCE MODIFY REQUEST消息，携带需要增删的QoS Flow Add or Modify Request List和QoS Flow to Release List。gNodeB根据Q

22、oS策略进行判决，其结果有三种可能：l 新增DRB：新增的Qos Flow无法映射到存量的DRB上，需要新增DRB满足其QoS要求；l 删除DRB：映射在某DRB上的QoS Flow被全部删除，则该DRB需要删除；l 修改DRB：在存量的DRB上增加新的QoS Flow映射，或者删除QoS Flow映射；步骤 2 gNB向UE发送RRCReconfiguration消息；步骤 3 UE向gNB回复RRCReconfigurationComplte消息；步骤 4 gNB向AMF发送PDU SESSION RESOURCE MODIFY RESPONSE消息，将修改的信息写入PDU Session

23、 Resource Modify Response List信元中；-结束1.4 PDU会话释放过程PDU会话释放过程可以由AMF主动触发，也可以由gNB主动触发。l AMF主动触发PDU会话释放过程:AMF通过发送PDU SESSION RESOURCE RELEASE COMMAND到gNodeB来释放PDU Session。l gNB主动触发PDU会话释放过程: gNB检测到NG-U传输故障后，重新分配新的NG-U地址，如果分配失败，则向核心网发送PDU SESSION RESOURCE NOTIFY，触发核心网发起PDU会话释放过程; QoS Flow GBR速率无法满足后，gNB向核

24、心网发送PDU SESSION RESOURCE NOTIFY，触发核心网发起PDU会话修改或释放过程步骤 1 【可选】gNB检测到NG-U传输故障后，先尝试重新分配新的NG-U地址，如果分配失败，则向核心网发送PDU SESSION RESOURCE NOTIFY，触发核心网发起PDU会话释放过程；步骤 2 AMF向gNB发送的PDU SESSION RESOURCE RELEASE COMMAND消息，携带需要删除的PDU SESSION列表；步骤 3 gNB向UE发送RRCReconfiguration消息，通知释放PDU会话；步骤 4 UE完成PDU会话释放后，向gNB回复RRCRec

25、onfigurationComplte消息；步骤 5 gNB发起该PDU SESSION对应的DRB承载和NG-U传输的删除操作，然后向AMF发送PDU SESSION RESOURCE RELEASE RESPONSE响应消息；-结束1.5 关键消息解读1.5.1 NGAP PDU SESSION RESOURCE SETUP REQUESTPDU SESSION RESOURCE SETUP REQUEST消息定义参见3GPP 38.413，关键IE摘录如下：IEPresence取值范围含义说明备注.PDU Session Resource Setup Request ListM待建立的P

26、DU会话列表PDU Session Resource Setup Request Item1.允许建立的最大PDU会话个数：协议定义的规格是256，HUAWEI支持的规格是8PDU Session IDMINTEGER (0.255).PDU Session Resource Setup Request TransferMUE Aggregate Maximum Bit RateOAMBR，非GBR类型的QoSFlow的上下行订阅参数，当PDU Session Resource Setup Request List IE存在时，该信元必带。UE Aggregate Maximum Bit Ra

27、te DownlinkMBit RateUE Aggregate Maximum Bit Rate UplinkMBit Rate.关键信元解读：1. PDU Session Resource Setup Request TransferIEPresence取值范围含义说明备注PDU Session Aggregate Maximum Bit RateOPDU会话AMBR:This IE shall be present when at least one Non-GBR QoS flow is being setup.UL NG-U UP TNL InformationMUPF endpoi

28、nt of the NG-U transport bearer, for delivery of UL PDUs.Additional UL NG-U UP TNL InformationOUPF endpoint of the additional NG-U transport bearer(s), for delivery of UL PDUs for split PDU session.Data Forwarding Not PossibleOENUMERATED (data forwarding not possible, )是否支持数据转发：This IE may be presen

29、t in case of HANDOVER REQUEST message and shall be ignored otherwise.PDU Session TypeMENUMERATED (Ipv4, Ipv6, Ipv4v6, ethernet, unstructured, .)Security IndicationOUP integrity protection and ciphering for corresponding PDU sessionsNetwork InstanceOQoS Flow Setup Request List1QoS Flow Setup Request

30、Item1.允许建立的最大QoS Flow个数：协议定义的规格是64，HUAWEI支持的规格是16QoS Flow IdentifierMQoS Flow Level QoS ParametersME-RAB IDO2. QoS Flow Level QoS Parameters1.5.2 NGAP PDU SESSION RESOURCE SETUP RESPONSEPDU SESSION RESOURCE SETUP RESPONSE消息定义参见3GPP 38.413。1.5.3 NGAP PDU SESSION RESOURCE MODIFY REQUESTPDU SESSION RES

31、OURCE MODIFY REQUEST消息定义参见3GPP 38.413，关键IE摘录如下：IEPresence取值范围含义说明备注.PDU Session Resource Modify Request ListM待修改的PDU会话列表PDU Session Resource Modify Request Item1.允许修改的最大PDU会话个数：协议定义的规格是256，HUAWEI支持的规格是8PDU Session IDMINTEGER (0.255)待修改的PDU会话IDNAS-PDUOPDU Session Resource Modify Request TransferM待修改的

32、PDU会话信息，详细定义见下文.PDU Session Resource Modify Request Transfer定义如下：IEPresence取值范围含义说明备注PDU Session Aggregate Maximum Bit RateOPDU会话AMBRUL NG-U UP TNL Modify List0.1上行数据NG-U TNL承载UL NG-U UP TNL Modify Item1.UL NG-U UP TNL InformationMUPF endpoint of the NG-U transport bearer, for delivery of UL PDUs.DL

33、 NG-U UP TNL InformationMIdentifies the NG-U transport bearer at the NG-RAN node.Network InstanceOQoS Flow Add or Modify Request List0.1新增的QoS Flow列表QoS Flow Add or Modify Request Item1.新增的QoS FlowQoS Flow IdentifierMINTEGER (0.63, )QoS Flow标识QoS Flow Level QoS ParametersOQoS Flow质量参数E-RAB IDOE-RAB

34、ID，仅限于NSA场景QoS Flow to Release ListO删除的QoS Flow列表Additional UL NG-U UP TNL InformationOUPF endpoint of the additional NG-U transport bearer(s) proposed for delivery of UL PDUs for split PDU session.1.5.4 NGAP PDU SESSION RESOURCE MODIFY RESPONSEPDU SESSION RESOURCE MODIFY RESPONSE消息定义参见3GPP 38.413。1

35、.5.5 RRCReconfigurationRRCReconfiguration消息定义参见3GPP 38.331，关键IE摘录如下：IEPresence取值范围含义说明备注radioBearerConfigMRadioBearerConfigRB承载配置信息secondaryCellGroupOOCTET STRING (CONTAINING CellGroupConfig)SCG信息measConfigOMeasConfig测量控制信息nonCriticalExtensionORRCReconfiguration-v1530-IEsmasterCellGroupOCTET STRING

36、(CONTAINING CellGroupConfig)MCG信息fullConfigOENUMERATED true全量配置指示：The field is mandatory present in case of inter-system handover from E-UTRA/EPC to NRdedicatedNAS-MessageListOSEQUENCE (SIZE(1.maxDRB) OF DedicatedNAS-MessageNAS消息masterKeyUpdateOMasterKeyUpdate密钥更新dedicatedSIB1-DeliveryOOCTET STRING (CONTAINING SIB1)传递SIB1dedicatedSystemInformationDeliveryOOCTET STRING (CONTAINING SystemInformation)传递OSI:This field is used to transfer SIB6, SIB7, SIB8 to the UE.关键信元解读：1. DRB逻辑信道相关配置（radioBearerConfig/masterCellGroup）1.5.6 RRCReconfigurationCompleteRRCReconfigurationComplete消息定义参见3GPP 38.331。