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TGaq Design Options

In a 2013 presentation, Stephen McCann from RIM discusses design options for enhancing service discovery before association in IEEE 802.11 networks. The proposed mechanisms aim to advertise service existence and ensure information delivery through simple protocols, emphasizing the integration of existing higher-layer solutions like UPnP and Bonjour. Key objectives include analyzing use cases, proposing solutions, and coordinating with other forums such as the Wi-Fi Alliance. The document outlines the need for a streamlined MAC protocol and discusses the Access Network Query Protocol (ANQP) for service metadata retrieval.

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TGaq Design Options

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  1. TGaq Design Options Authors: Date: 2013-03-18 Stephen McCann, RIM

  2. Abstract Thoughts about Design Options for the TGaq meeting in March 2013, Orlando, Florida, USA Stephen McCann, RIM

  3. Need for Project (From PAR) • This amendment will provide mechanisms that assist in pre-association discovery of services by addressing the means to advertise their existence and enable delivery of information that describes them. This information about services is to be made available prior to association by stations operating on IEEE 802.11 wireless networks. • There are existing higher layer service discovery/description approaches (e.g. UPnP, Bonjour) as well as mechanisms to deliver information in pre-association states (e.g. just as ANQP can be delivered over GAS). Stephen McCann, RIM

  4. Way Forward • What do we want to do? • Use Case/Requirements analysis • Call for proposed solutions (complete/partial) • Down selection criteria (if multiple proposals) • Simple Protocol (quick) • Communication plan with other Fora (e.g. Wi-Fi Alliance?) Stephen McCann, RIM

  5. Quick Option • TGaq develops simple MAC protocol • Meets low level requirements of use cases • Other Fora deal with higher layers (L2+) • Liaison to other fora of our use cases Stephen McCann, RIM

  6. GAS • GAS designed to provide pre-association protocol • Request/Response mechanism to network server • Asynchronous timing • Built in server side delay (comeback delay) • Timing can be altered to reduce amount of Request/Responses Stephen McCann, RIM

  7. IEEE 802.11u: Signaling Interworked Servers 802.11u Roaming and Network Info AP 802.11aq STA Services GAS SSPN Interface Emergency Network Alerts Connection W/O Association 802.11af TV White Spaces Location M I B Advertisement s Protocol #0 ANQP #1,2 MIH #3 EAS #4 RLQP #5 Service Beacon Probe Probe response Stephen McCann, RIM

  8. ANQP • Access Network Query Protocol • Designed to fetch static access network data from AP • Request sends integer cook book value (e.g. 258) • Response returns data (e.g. Venue Name) • RLQP similar for TVWS registered location data • Other QPs can be easily added • New “ANQP” protocol to carry UPnP, Bonjour frames • Do we have to determine which frames would be required? • Adjust the timing/frequency of queries Stephen McCann, RIM

  9. Protocol Ideas • Some simple new service discovery messages • Upper layer encapsulation • Return Codes • Signed (secure) messages? Stephen McCann, RIM

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