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  • 4G 信令中的 PCO 字段

    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).

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  • 原文地址:https://www.cnblogs.com/hzcya1995/p/13309323.html
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