Radio Resource Measurements : Timing and Scheduling Considerations September 2002 Radio Resource Measurements : Timing and Scheduling Considerations Dr. Mehul Mehta Synad Technologies, Ltd. Reading. U.K Mehul.Mehta@Synad.com Dr. Mehul Mehta, Synad Technologies Ltd. UK

Introduction Initiate discussion on June 2002 doc.: IEEE 802.11-02/xxxr0 September 2002 Introduction Initiate discussion on Signalling issues concerning Radio Resource Measurement (RRM) Possible formats and types Confidence in measurements Systems Issues Dr. Mehul Mehta, Synad Technologies Ltd. UK Mike Moreton, Synad Technologies Ltd.

June 2002 doc.: IEEE 802.11-02/xxxr0 September 2002 The Aim of RRM is… To reliably measure and report radio link measurements Within a BSS, ESS, or beyond Request/Response Protocol Signal _request Perform measurement Signal _response When to measure Random RRM request Pseudo-Periodic RRM request Periodic RRM request Periodic RRM without individual request How to measure Need to define common understanding and methods for calculating each entity Dr. Mehul Mehta, Synad Technologies Ltd. UK Mike Moreton, Synad Technologies Ltd.

RRM Request Types Random RRM request Pseudo-Periodic RRM request June 2002 doc.: IEEE 802.11-02/xxxr0 September 2002 RRM Request Types Random RRM request Occasional Fixed or Event based measurement period Pseudo-Periodic RRM request Intermittent Fixed number of requests over a given time interval Periodic RRM request Regular Fixed number of requests at specific intervals over a given time period Predefined measurement period (a priori) Periodic RRM without individual request Single initial request, subsequent periodic responses Dr. Mehul Mehta, Synad Technologies Ltd. UK Mike Moreton, Synad Technologies Ltd.

RRM Response Types High priority response Rapid response June 2002 doc.: IEEE 802.11-02/xxxr0 September 2002 RRM Response Types High priority response else measurement is timed out and hence invalid Rapid response takes priority over data traffic Best effort response takes same priority as data traffic Low/Medium priority response relatively long response time interval Dr. Mehul Mehta, Synad Technologies Ltd. UK Mike Moreton, Synad Technologies Ltd.

Possible RRM Signalling June 2002 doc.: IEEE 802.11-02/xxxr0 September 2002 Possible RRM Signalling _request(parameters) Point-to-point, Multicast, Broadcast One or more RRM with a single request Initiated by AP or STA Parameters could include Identifier, confidence rating, and validity time stamp Desired response type and time period Single response Multiple responses at regular intervals _ack() fields accept, reject, revised offer _response() Return one or more RRMs Combine one or more responses e.g. AP e.g., STA _request(parameters) _ack() _response(measurement(s)) Dr. Mehul Mehta, Synad Technologies Ltd. UK Mike Moreton, Synad Technologies Ltd.

Confidence in Measurements June 2002 doc.: IEEE 802.11-02/xxxr0 September 2002 Confidence in Measurements Packet Networks exhibit bursty traffic conditions Lack of regular uninterrupted transmission period RRM will have to be over spasmodic transmission intervals Overall measurement duration may be extended to meet accuracy Statistical estimates can degrade significantly Will affect decisions made with potentially inaccurate measurements Measurement accuracy varies Type of measurement, response duration, traffic conditions Need to define how each RRM is calculated Identify frame types best suited for each measurement Suggest duration (time and events) for statistical confidence RRMs must each have a time stamp Valid (e.g., most recent) or Invalid (e.g., previously recorded) Dr. Mehul Mehta, Synad Technologies Ltd. UK Mike Moreton, Synad Technologies Ltd.

System Issues Scheduling of measurement requests may vary June 2002 doc.: IEEE 802.11-02/xxxr0 September 2002 System Issues Scheduling of measurement requests may vary Rival policies may issue measurement requests at different times and at different rates Depends on network density Number of APs, STAs Traffic mix (real-time, Non real-time, QoS stamps etc.) Cost of measurement requests may vary Bandwidth consumption and effect on throughput Vary between BSSs of different traffic mix with time RMM signals will compete for the medium Need to resolve radio access conflicts Priority queuing of RMM frames Dr. Mehul Mehta, Synad Technologies Ltd. UK Mike Moreton, Synad Technologies Ltd.

In summary… Requirements for RRM… June 2002 doc.: IEEE 802.11-02/xxxr0 September 2002 In summary… Requirements for RRM… Types of radio link attributes needed Accuracy, Confidence, Validity List the different RRM and organise them Occasionally, Intermittently, Regularly, Frequently …will depend on entities that will use RRMs Target deployment type Public WLAN access, Enterprise, Home, SOHO, others Complexity and ‘Sophistication’ of the incumbent policies …and would also help structure the measurements Database type ‘key’ access Interface with minimal complexity Dr. Mehul Mehta, Synad Technologies Ltd. UK Mike Moreton, Synad Technologies Ltd.