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RF9

Viewing 4 posts - 1 through 4 (of 4 total)
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  • #59473 Reply
    BVC & MS flow control
    Guest

    Hi,

    Please tell me about the BVC & MS flow control for EGPRS network.

    Is it usefull to enable this feature.

    #59474 Reply
    C300G
    Guest

    Well, it’s system that dynamicly controls two parameters of “Leaky bucket” algorithm: “Bucket size” and “Bucket leak rate”. This algorithm allows to smooth transmission rate in downlink direction. It basicly consists of transit buffer with size=”Bucket size” and transmission rate from that buffer to MS limited by value of “Bucket leak rate”. When buffer is full all inbound from ip-backbone ip-packets placed in queue on time that calculated by “Bucket leak rate”.
    Strange… I always thought that this mechanism works by default.

    #59475 Reply
    RF9
    Guest

    Thanks C300G for ur reply.

    Can u help me to understand the below BVC and MS flow control message:

    1.)

    Message Type: FLOW_CTRL_BVC(26)
    The Tag to correlate request and response PDUs(1E)
    The maximum BVC bucket size(MSB)(3510000 octets)
    Bucket Leak Rate (R)(640000 bits/sec)
    BVC Measurement(3510000 octets)
    R_default_MS(640000 bits/sec)

    Message Type: FLOW_CTRL_BVC_ACK(27)
    The Tag to correlate request and response PDUs(1E)

    2.)

    Message Type: FLOW_CTRL_MS(28)
    TLLI: 0xC704458F
    The Tag to correlate request and response PDUs(00)
    MS Bucket Size(6DB0)
    Bucket Leak Rate (R)(0C80)

    Message Type: FLOW_CTRL_MS_ACK(29)
    TLLI: 0xC704458F
    The Tag to correlate request and response PDUs(00)

    Regards
    RF9

    #59476 Reply
    C300G
    Guest

    #1:
    >Message Type: FLOW_CTRL_BVC(26)
    This PDU informs the flow control mechanism at an SGSN of the status of a BVC’s maximum acceptable SGSN to BSS
    throughput on the Gb interface. Direction BSS/PCU -> SGSN.

    >The Tag to correlate request and response PDUs(1E)
    Some additional dialogue-id-tag.

    >The maximum BVC bucket size(MSB)(3510000 octets)
    Maximum intermediate buffer “Bucket” size for that BVC: 3510000 bytes.

    >Bucket Leak Rate (R)(640000 bits/sec)
    “Bucket Leak Rate” for that BVC: 640000 bits/sec.

    >BVC Measurement(3510000 octets)
    Something is wrong here. “BVC Measurement” must be measured in centiseconds, but not in bytes.
    It looks more-like “Bmax default MS” parameter – default intermediate buffer “Bucket” size for a one subscriber-session on that BVC: 3510000 bytes.

    >R_default_MS(640000 bits/sec)
    Default “Bucket leak rate” for a one subscriber-session on that BVC: 640000 bits/sec.

    >Message Type: FLOW_CTRL_BVC_ACK(27)
    >The Tag to correlate request and response PDUs(1E)
    Acnowledgement form SGSN on FLOW_CTRL_BVC message with that BVCI and Tag 1E.

    #2:
    >Message Type: FLOW_CTRL_MS(28)
    This PDU informs the flow control mechanism at an SGSN of the status of an MS’s maximum acceptable SGSN to BSS
    throughput on the Gb interface. Direction MS -> SGSN.
    >TLLI: 0xC704458F
    Subscriber session ID on BSSGP-signaling layer.

    >The Tag to correlate request and response PDUs(00)
    Some additional dialogue-id-tag.

    >MS Bucket Size(6DB0)
    Bucket buffer size for that MS-session: 2808000 bytes.

    >Bucket Leak Rate (R)(0C80)
    “Bucket Leak Rate” for that MS-session: 320000 bits/sec.

    >Message Type: FLOW_CTRL_MS_ACK(29)
    >TLLI: 0xC704458F
    >The Tag to correlate request and response PDUs(00)
    Acnowledgement form SGSN on FLOW_CTRL_MS message with TLLI 0xC704458F and Tag 00.

Viewing 4 posts - 1 through 4 (of 4 total)
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