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4G 信令中的 PCO 字段

程序员文章站 2022-10-02 20:28:31
目录文章目录目录Protocol Configuration OptionProtocol Configuration OptionPCO(Protocol Configuration Option,协议配置选项)用于为 UE 提供一些其连接到的网络相关的附加信息。这是一个可选的协议字段,只有当 UE 请求 PCO 选项时,PCO 才会出现在 Attach Accept 信令消息中。PCO......

目录

Protocol Configuration Option

PCO(Protocol Configuration Option,协议配置选项)用于为 UE 提供一些其连接到的网络相关的附加信息。这是一个可选的协议字段,只有当 UE 请求 PCO 选项时,PCO 才会出现在 Attach Accept 信令消息中。

PCO 包含两个子字段:

  • Configuration Protocol options list(配置协议选项列表),是协议的标识符,与特定的配置协议(PPP)有关。
  • Additional Parameter list(附加参数列表),包含了需要发送到 EPC 或 NGC 的特殊参数或请求,与特定的配置协议(PPP)无关。

Which message UE will put this filed:

  • UE can put PCO optional IE’s in RRC Connection Setup Complete.
  • It contains DedicatedInfoNAS fields which carries NAS Attach Request
  • Under this ESM message Container filed and which carries PDP Connectivity Request
  • Under this Protocol Configuration Options field present.

RRC Connection Setup Complete -> DeidicatedNASInfo -> ESM Message Container -> Protocol Configuration Options

Which message EPC will put this filed:

  • EPC includes PCO fields in S1AP Initial Context Setup message
  • It contains DedicatedInfoNAS fields carries Attach Accept message and information present for Activate Default Bearer Context request.
  • Which carries ESM Message Container field.
  • Inside this Protocol Configuration Options field present.

SIAP Initial Context Setup -> DedicatedInfoNAS -> ESM Message Container -> Protocol Configuration Options

Condition: EPC will includes only those filed in Attach Accept message that UE requested in Attach Request -> PCO fields. Refer Specification TS 24.008 V8.0 and clause 10.5.6.3 for more details.

UE to Network: Following fields UE may include in PCO fields:

  • 0001H (P-CSCF Address Request);
  • 0002H (IM CN Subsystem Signaling Flag);
  • 0003H (DNS Server Address Request);
  • 0004H (Not Supported);
  • 0005H (UE Support of Network Requested Bearer Control indicator); and
  • 0006H (Preferred Bearer Control Mode).

Network to UE direction: Following fields UE may include in PCO fields

  • 0001H (P-CSCF Address);
  • 0002H (IM CN Subsystem Signaling Flag);
  • 0003H (DNS Server Address);
  • 0004H (Policy Control rejection code) ; and
  • 0005H (Selected Bearer Control Mode).

本文地址:https://blog.csdn.net/Jmilk/article/details/105765767