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Broadcast of Neighbor Info

July 2003. doc: IEEE 802.11-03/553r0. Broadcast of Neighbor Info. Joe Kwak, Akbar Rahman InterDigital. Outline. Introduction Summary of proposal Operation principle. Introduction.

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Broadcast of Neighbor Info

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  1. July 2003 doc: IEEE 802.11-03/553r0 Broadcast of Neighbor Info Joe Kwak, Akbar Rahman InterDigital Joe Kwak, InterDigital

  2. Outline • Introduction • Summary of proposal • Operation principle Joe Kwak, InterDigital

  3. Introduction • Currently in 802.11k there is a point to point method to allow STAs to get neighbor channel information from the AP (AP Channel Report). • The Neighbor List information (such as AP Channel Report and Site Report) will allow for more efficient STA roaming (handover/reselections) to be performed. • Recent discussions indicate that extending Beacon frames with neighbor channel information may be disadvantageous with respect to resource usage. • Another alternative is presented here. Joe Kwak, InterDigital

  4. Summary of Proposal (1) • As a possible alternative to consider, a broadcast-type message containing the Neighbor Information could supplement to the current point-to-point signaling without significant impact to radio resource utilization in the channel. • In 802.11, broadcast messages are, • Sent with contention by the AP after the Beacon frame • Addressed to all STA’s in the BSS • No guaranteed delivery (No RTS/CTS sequence or ACK from STAs) Joe Kwak, InterDigital

  5. Summary of Proposal (2) Beacon Interval Time Beacon Frame AP Channel Map as broadcast management type frame Contention phase Joe Kwak, InterDigital

  6. Principle of operation (1) • Assume an AP has Neighbor information obtained either through: • OAM, or • Proprietary signaling / IAPP from other network nodes (AP’s or Access Routers), or • Active/passive scanning of other channels, or • Measurement reports from STA’s in BSS • The AP could then choose to periodically broadcast (typically less frequent then Beacon frames) the Neighbor Info as assistance data and only to a group who can use the data. • In parallel, the STA could still choose to use active (Probe Request) or passive scanning as a backup and/or complement to the broadcast-type Neighbor Info. Joe Kwak, InterDigital

  7. Principle of operation (2) • The periodicity of the Neighbor Info broadcast can be implementation dependent, but it would typically be in the order of several seconds: • STAs have limited and/or slow mobility compared to full mobile communication systems • Uses less frame time than repeated Beacon broadcast • Maintains the radio resource usage efficiency of point-to-multipoint messaging • The broadcast-type Neighbor Info could be a Management frame type with same message format as the existing pt-pt message • The associated procedures in the STA after reception of the broadcast Neighbor Info should be the same as that of the existing pt-pt message (with exception of Ack part) Joe Kwak, InterDigital

  8. Strawpole for normative text • Should we draft normative text along these lines to permit group broadcast of neighbor info to TGk terminals? • Vote YEA _______ • Vote NEA _______ • ABSTAIN _______ Joe Kwak, InterDigital

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