QoS Maximum bit rate down link element at RANAP

Question

I wanna be able to see the QoS Maximum bit rate down link (extension) at RANAP protocol but I'm getting the packet decoded as PPP IPCP instead of RANAP.

I'm using 1.44 version and I don´t know if I need something else (config or add on ) to get this packet decoded. from the link below I understand this is supported.

http://www.wireshark.org/docs/dfref/g/gsm_a_gm.html

Any help on this will be appreciated.

Answer 1

Hi,

You can expand the message and find RANAP in there, here is an example

Radio Access Network Application Part
    RANAP-PDU: initiatingMessage (0)
        initiatingMessage
            procedureCode: id-DirectTransfer (20)
            criticality: ignore (1)
            value
                DirectTransfer
                    protocolIEs: 2 items
                        Item 0: id-NAS-PDU
                            ProtocolIE-Field
                                id: id-NAS-PDU (16)
                                criticality: ignore (1)
                                value
                                    NAS-PDU: 8a42030e0b911f7396fefe7481ffff004f00022b0601210a...
                        Item 1: id-SAPI
                            ProtocolIE-Field
                                id: id-SAPI (59)
                                criticality: ignore (1)
                                value
                                    SAPI: sapi-0 (0)
GSM A-I/F DTAP - Activate PDP Context Accept
    Protocol Discriminator: GPRS session management messages
        1... .... = TI flag: allocated by receiver
        .000 .... = TIO: 0
        .... 1010 = Protocol discriminator: GPRS session management messages (10)
    01.. .... = Sequence number: 1
    DTAP GPRS Session Management Message Type: Activate PDP Context Accept (0x42)
    0000 .... = Spare bit(s): 0
    .... 0011 = LLC SAPI: SAPI 3 (3)
    Quality Of Service - Negotiated QoS
        Length: 14
        00.. .... = Spare bit(s): 0
        ..00 1... = Quality of Service Delay class: Delay class 1 (1)
        .... .011 = Reliability class: Delay class 3 (3)
        1001 .... = Peak throughput: Up to 256 000 octet/s (9)
        .... 0... = Spare bit(s): 0
        .... .001 = Precedence class: High priority (1)
        000. .... = Spare bit(s): 0
        ...1 1111 = Mean throughput: Best effort (31)
        011. .... = Traffic class: Interactive class (3)
        ...1 0... = Delivery order: Streaming class (2)
        .... ..11 = Delivery of erroneous SDUs: Erroneous SDUs are not delivered('No') (3)
        Maximum SDU size: 1500 octets (150)
        Maximum bitrate for uplink: 8640 kbps (254)
        Maximum bitrate for downlink: 8640 kbps (254)
        0111 .... = Residual Bit Error Rate (BER): 1*10-5 (7)
        .... 0100 = SDU error ratio: 1*10-4 (4)
        1000 00.. = Transfer delay: 1000 ms (32)
        .... ..01 = Traffic handling priority: Priority level 1 (1)
        Guaranteed bitrate for uplink: 0 kbps (255)
        Guaranteed bitrate for downlink: 0 kbps (255)
        000. .... = Spare bit(s): 0
        ...0 .... = Signalling indication: Not optimised for signalling traffic
        .... 0000 = Source statistics description: unknown (0)
        **Maximum bitrate for downlink (extended): 21 Mbps (79)**
        Guaranteed bitrate for downlink (extended): Use the value indicated by the Guaranteed bit rate for downlink (0)