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Discussion to derive HEW Functional Requirements

Discussion to derive HEW Functional Requirements. Date: 2013 -11- DD. Authors:. Abstract. This contribution discusses about challenges of WLAN for the future from cellular operator’s perspective, and derives some HEW functional requirements.

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Discussion to derive HEW Functional Requirements

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  1. Discussion to derive HEW Functional Requirements • Date:2013-11-DD Authors: Yasunao Misawa, KDDI

  2. Abstract • This contribution discusses about challenges of WLAN for the future from cellular operator’s perspective, and derives some HEW functional requirements. Yasunao Misawa, KDDI

  3. 1. Background1.1 Mobile Data Traffic Explosion and WLAN • Provision of WLAN service will be continuously important for cellular operators in order to maintain and improve user experience dealing with explosively increasing traffic demands. • Increasing number of cellular LTE users are enjoying much higher throughput than 3G. Unless WLAN maintains the advantage of higher throughput, they will stop using WLAN, and choose cellular connections which have an advantage of ubiquity. • Relative advantage of WLAN decreases in traffic demanding places such as train stations because of interferences and congestions. Providing better user experience than cellular in such environment is the challenge for HEW. • Once a user gets disappointed with WLAN quality, he will stop using it. As a consequence, not only cellular operators, but also terminal vendors and WLAN equipment vendors will lose business opportunity. Yasunao Misawa, KDDI

  4. 1.2 Video Application Traffic • Almost two thirds of mobile data traffic is generated from video. Transmitting such large traffic over WLAN leverages user experience effectively. • Streaming video such as YouTube demands more than 3Mbps constantly in order to be enjoyed without stress. This indicates one criterion. • Real-time applications such as video conferencing require low latency and low jitter. Yasunao Misawa, KDDI

  5. 2. Subjects for Consideration2.1 Dense AP Deployment • In order to absorb rapidly increasing mobile data traffic, APs have to be deployed densely at Hot Spots where traffic is concentrated. • From the view of operator’s APs, interference occurs between APs of the same operator, between APs of different operators, with APs independently installed by shops etc., and with private APs such as mobile routers and tethering terminals. Those interferences cannot be avoided only by planned deployment. Yasunao Misawa, KDDI

  6. 2.2 Existence of different Management Entities • HEW has to consider the existence of different Management Entities sharing the same frequency bands. 2.3 Coexistence with legacy APs/STAs • Coexistence with legacy APs/STAs have to be taken into account for the HEW. • - If HEW can use new frequency band (e.g. 5GHz extension)exclusively, interworking with legacy APs/STAs will not have to be considered for the band. Yasunao Misawa, KDDI Slide 6 Katsuo Yunoki, KDDI R&D Labs.

  7. 3. Possible Approaches for Solution • Interference between APs should be minimized automatically even if they belong to different management entities. • Low rate transmissions should be rejected before associating them around the edge of AP coverage, for example. • Legacy STAs (e.g. 11b) should be less prioritized or made silent to maintain BSS performance. • New connection should be blocked to maintain transmission quality when AP is heavily loaded. • STA should be disconnected when sufficient quality is not provided. • STA should stop radio emission in order to suppress waste of radio resources when sufficient throughput is not expected. Yasunao Misawa, KDDI

  8. 4. HEW Functional Requirements • (1) Coordination Function between APs to minimize interference • - Power control, channel selection, beamforming and synchronization, for example, are preformed automatically for optimization. • - Fairness between APs has to be considered. • Some enhancement to 11aa or 11k may be needed. Yasunao Misawa, KDDI

  9. 4. HEW Functional Requirements • (2) STA Control Function by AP • Some control functions by AP will be needed to maintain desirable BSS performance instead of distributed coordination. • 2-1) Access Control to avoid or differentiate low rate transmissions • 2-2) Admission Control to block new connection for maintaining transmission quality • 2-3) Connection Control to disconnect low quality connection • 2-4) Radio Emission Control (transmission power control, transmission opportunity control) for radio resource efficiency Yasunao Misawa, KDDI

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