Classic GSM User Plane

Problems with classic approach

3GPP LCLS to the rescue

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3GPP LCLS problem domains

3GPP LCLS early media

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3GPP LCLS early media

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3GPP LCLS tone / announcement

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3GPP LCLS: Negotiation in CN

3GPP LCLS Negotiation results

3GPP LCLS: Implications on A / BSSMAP

3GPP LCLS: Osmocom Plans

  1. Plan: support minimal sub-set without bi-casting
    1. in OsmoBSC
      1. requires us to add BSSMAP LCLS IEs/Messages
      2. will use MGCP to re-configure the CN-side RTP connection on OsmoMGW
      3. development will be test-driven (develop TTCN-3 tests first)
    2. in OsmoMSC (only among RANs connected to single MSC)
      1. requires us to permit/enable LCLS on AoIP

Further Reading

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