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接入链路控制应用部分（ALCAP） ​

ALCAP 是用于 UMTS 传输层控制平面的协议，负责管理用户并将其复用到 ATMAAL2 虚连接中。ALCAP 针对 Iub、Iur 和 Iu（电路交换域）接口进行了规定。该协议仅在这些接口基于 ATM 时使用。ITU-T Q.2630.2 标准，即 AAL type 2 signalling protocol - Capability Set 2，被选为 ALCAP 协议。

历史 ​

对于 Iub 和 Iur 接口，ALCAP 在 3GPP TS 25.426 中规定。对于 Iu 接口，ALCAP 在 3GPP TS 25.414 中规定。

协议依赖 ​

  • SSCOP：传输 ALCAP 信令消息的 SAAL 子层。

  • SSCF-NNI、MTP3b：仅适用于 Iur 和 Iu 接口的附加层。

示例流量 ​

Wireshark 解码的 ALCAP (Q.2630) Establish request 消息示例：

AAL type 2 signalling protocol (Q.2630) DSAID: 0x00000000 Message Type: Establish request (ERQ) (5) Message Compatibility: 22 .0.. .... = Pass-On SNI: Do Not Send Notification (0) ..10 .... = Pass-On II: Discard Message (2) .... .0.. = General SNI: Do Not Send Notification (0) .... ..10 = General II: Discard Message (2) Parameter: Originating signalling association identifier (OSAID) (6) Message Compatibility: 22 .0.. .... = Pass-On SNI: Do Not Send Notification (0) ..10 .... = Pass-On II: Discard Message (2) .... .0.. = General SNI: Do Not Send Notification (0) .... ..10 = General II: Discard Message (2) Length: 4 OSAID: 0x02000044 Parameter: Connection element identifier (CEID) (2) Message Compatibility: 22 .0.. .... = Pass-On SNI: Do Not Send Notification (0) ..10 .... = Pass-On II: Discard Message (2) .... .0.. = General SNI: Do Not Send Notification (0) .... ..10 = General II: Discard Message (2) Length: 5 Path ID: 65 CID: 127 Parameter: Destination NSAP service endpoint address (DNSEA) (4) Message Compatibility: 22 .0.. .... = Pass-On SNI: Do Not Send Notification (0) ..10 .... = Pass-On II: Discard Message (2) .... .0.. = General SNI: Do Not Send Notification (0) .... ..10 = General II: Discard Message (2) Length: 20 Address: 4556789ABCDEF0120F0000000000000000000000 IDP = 4556789ABCDEF0120F X.213 Address Format Information ( AFI ): E.164 (0x45) IDI = 56789ABCDEF0120F Country Code: 56 Chile length 2 DSP length 11(len 20 -9 ) X.213 Address Format Information ( DSP ): 0000000000000000000000 Parameter: Link characteristics (ALC) (5) Message Compatibility: 22 .0.. .... = Pass-On SNI: Do Not Send Notification (0) ..10 .... = Pass-On II: Discard Message (2) .... .0.. = General SNI: Do Not Send Notification (0) .... ..10 = General II: Discard Message (2) Length: 12 Maximum Forward Bit Rate: 75 Maximum Backwards Bit Rate: 81 Average Forward Bit Rate: 75 Average Backwards Bit Rate: 16 .001 1000 = Maximum Forward CPS SDU Size: 24 .001 1010 = Maximum Backwards CPS SDU Size: 26 .001 1000 = Average Forward CPS SDU Size: 24 .001 1010 = Average Backwards CPS SDU Size: 26 Parameter: Served user generated reference (SUGR) (7) Message Compatibility: 22 .0.. .... = Pass-On SNI: Do Not Send Notification (0) ..10 .... = Pass-On II: Discard Message (2) .... .0.. = General SNI: Do Not Send Notification (0) .... ..10 = General II: Discard Message (2) Length: 4 SUGR: 0F000000 Parameter: Served user transport (SUT) (8) Message Compatibility: 11 .0.. .... = Pass-On SNI: Do Not Send Notification (0) ..01 .... = Pass-On II: Discard Parameter (1) .... .0.. = General SNI: Do Not Send Notification (0) .... ..01 = General II: Discard Parameter (1) Length: 3 SUT Length: 0x02 SUT: 0204

Wireshark ​

ALCAP dissector 功能完整；不过目前它只能由用户 DLT（data link type）调用，或由另一个 dissector 按名称调用。参见 FileFormatReference。

首选项设置 ​

（XXX 添加指向会影响 PROTO 解析方式的首选项设置的链接）。

示例抓包文件 ​

XXX - 向 SampleCaptures 页面添加一个简单的示例抓包文件，并从这里链接过去（见下文）。保持该文件简短；将其 gzip 压缩以进一步减小体积也是一个好主意，因为 Wireshark 可以自动打开 gzipped 文件。

  • SampleCaptures/...

显示过滤器 ​

ALCAP 显示过滤器字段的完整列表可以在显示过滤器参考中找到

仅显示基于 ALCAP 的流量：

 alcap

抓包过滤器 ​

由于目前 ALCAP 跟踪只能从已有的跟踪文件中读取，因此无法在抓包时过滤 ALCAP 消息。

外部链接 ​

  • 3GPP specification: 25.414

  • 3GPP specification: 25.426

  • ITU-T Recommendation Q.2630.2 AAL type 2 signalling protocol - Capability Set 2（2000-12 版本）

讨论 ​

Imported from https://wiki.wireshark.org/ALCAP on 2020-08-11 23:11:07 UTC

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