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On Definition of Dense Networks and Performance Metric

On Definition of Dense Networks and Performance Metric. Date: 2013-07-06. Authors:. Usage models and HEW focus. The usage categories for WFA liaison was presented in HEW teleconferences [1]. HEW’ s Goal: Improve efficiency in high density WLAN How to define a density network?

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On Definition of Dense Networks and Performance Metric

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  1. On Definition of Dense Networks and Performance Metric Date: 2013-07-06 Authors: Jianhan Liu, etc. Mediatek Inc.

  2. Usage models and HEW focus • The usage categories for WFA liaison was presented in HEW teleconferences [1] Jianhan Liu, etc. Mediatek Inc.

  3. HEW’ s Goal: Improve efficiency in high density WLAN • How to define a density network? • How much performance enhancement we should expect in different usage cases? • Proposed Performance Metric • BRCM Proposed performance metric as bps/ square meter [2] • Huawei proposed the performance metric also considers power /energy consumption in [3] • Basically, Area throughput is the main performance metric • Is bps/square meter or area throughput the best metric in high density WLAN? Definition of Dense Network and Performance Metric Jianhan Liu, etc. Mediatek Inc.

  4. Area throughput is equivalent to average throughput per STA when the density of the network is given. • For a given area with x square meters, area throughput is • Given the density of the network , average throughput per STAs is • If the network density is set, average throughput per STAs is just a constant scaling of area throughput. • Notes: • Average throughput per STA is more closely to user experience. • Density should be included into performance metric. Area Throughput and Average Throughput per STA Jianhan Liu, etc. Mediatek Inc.

  5. Average Throughput per STA decays at least inversely with density • Without considering sum throughput decrease due to collisions • Assume that the sum throughput in a given area is constant R (say, the throughput of a sparse network), then the throughput per STA can be written as Average Throughput per STA Decaying Bound • Two Key Observations: • For dense networks that there are a lot of STAs per AP, the average throughput per STA is impossible to guarantee. • Area throughput is not changed in this case. However, user experience becomes horrible when density is high Jianhan Liu, etc. Mediatek Inc.

  6. For category 1 and 2 with high number of STAs per AP: • the enhancement room is to approach the bound by reducing collisions. User experience is still not good even it is optimized. • Category 3 is a more interesting problem in HEW’s • Can user experience per STA be the same as in it in sparse network? Theoretically, it is possible. What a density network problem possibly has a nice solution? Jianhan Liu, etc. Mediatek Inc.

  7. Using area throughput as the performance metric needs more discussion • Area throughput in some cases does not reflects the user experience • For example, Average throughput per STA reflects the user experience more directly • Average throughput per STA includes the density factor • Minimum or outage data rate also reflects somewhat user experience in dense networks [4] • Maybe average and/or outage throughput per STA with uniformly geographic distribution is worth consideration too. Summary and Discussions Jianhan Liu, etc. Mediatek Inc.

  8. [1] “Usage models for IEEE 802.11 High Efficiency WLAN study group (HEW SG) –Liaison with WFA”, IEEE 802.11-13/0657r2,Laurent Cariou, etc. [2] “HEW- Metrics, Targets, Simulation Scenarios”, IEEE 802.11-13/0486r1, Ron Porat, etc. [3] “HEW Functional Requirements”, IEEE 802.11-13/0524r2, Tianyu Wu, etc. [4] “Quantitative QoE Requirements for HEW”, IEEE 802.11-13/0850, HuairongShao, etc. Reference Jianhan Liu, etc. Mediatek Inc.

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