Thoughts on HEW PAR

1. Thoughts on HEW PAR • Date:2014-01-20 Authors: Yong Liu, et al.

2. Authors: Yong Liu, et al.

3. Introduction • WLAN has been incredibly successful over the last decade, thanks to its ease of deployment and low cost • The HEW SG has been created to focus on improving efficiency, especially in high density networks, for the next generation WLAN • We believe that enhancements to both Quality of Experience (QoE) and power efficiencywould be needed to make the next generation WLAN more attractive and competitive Yong Liu, et al.

4. Enhanced QoE • QoE would benefit from achieving lower latency, lower jitter, and higher average minimum throughput per STAto supportdelay sensitive applications • Such requirements have been largely incorporated in the draft PAR [3] • 5.5 Need for the Project • Additionally WLAN devices are increasingly required to support a variety of applications such as video, cloud access, and offloading. With the real-time performance requirements of some of these application, WLAN users demand improved reliability in delivering their applications. Unlike previous amendments where the focus was on improving aggregate throughput, this amendment will focus on improving metrics that are affecting user experience, such as average per station throughput, the 5th percentile of per station throughput, and area throughput. • 8.1 Explanatory Notes • The metrics will directly correspond to the user experience in the identified scenarios, including overall throughputs, distribution of throughputs (e.g. 5th percentile of user throughput CDF), and satisfaction of packet delay and packet loss requirements of applications. Yong Liu, et al.

5. Power Efficiency • Power efficiency is critical to battery powered devices to enable future pervasive WLAN use cases • New challenges to the next generation WLAN: • Dense deployments may lead to congested wireless medium, thereby diminishing the benefits of existing 802.11 power saving schemes • Better QoE support, especially better support of low-latency applications, may force devices to power ON radios more frequently • With the increase in peer-to-peer communicationand Internet of Things, a mobile device may operate as a “master” from time to time. The traditional AP/STA power saving modes may not be useful or applicable Yong Liu, et al.

6. Proposed PAR text changes (1) • 5.2.b Scope of the project: • This amendment defines standardized modifications to both the 802.11 physical layers (PHY) and the 802.11 Medium Access Control Layer (MAC) that enable modes of operation capable of supporting at least two (2) times improvements in the average throughput per station (measured at the MAC data service access point) in dense indoor and pedestrian-speed outdoor deployment scenarios.,while also improving or maintaining average power efficiency per station. Yong Liu, et al.

7. Proposed PAR text changes (2) • 5.5 Need for the Project: • WLAN devices are currently being deployed in diverse environments. These environments are characterized by the existence of many access points and non-AP stations in geographically limited areas. Increased interference from neighbouring devices gives rise to performance degradation. Additionally WLAN devices are increasingly required to support a variety of applications such as video, cloud access, and offloading. In particular video traffic is expected to be the dominant type of traffic in many HEW deployments, with the need to satisfy its performance requirements. With the real-time requirements of some of these applications, WLAN users demand improved performance in delivering their applications, including lower latency and improved power consumption for battery-operated devices. • Unlike previous amendments where the focus was on improving aggregate throughput, this amendment will focus on improving metrics that are affecting user experience, such as average per station throughput, the 5th percentile of per station throughput, and area throughput., and average power efficiency per station. Improvements will be made to support environments such as airport/train station, E-education, public transportation, dense apartment building, and pico-cell street deployment. Yong Liu, et al.

8. References • [1] 11-13-1333-00-0hew-power-efficiency-par-requirements • [2] 11-13-1410-01-0hew-802-11-hew-draft-par-and-5c • [3] 11-14-0013-00-0hew-cc11-comments-analysis Yong Liu, et al.

9. SP1 • Do you support the text change in slide 6? • Y/N/A Yong Liu, et al.

10. SP 2 Do you support the following PAR scope text change? Y/N/A • 5.2.b Scope of the project: • This amendment defines standardized modifications to both the 802.11 physical layers (PHY) and the 802.11 Medium Access Control Layer (MAC) that enable modes of operation capable of supporting at least two (2) times improvement in the average throughput per station (measured at the MAC data service access point) in dense indoor and outdoor deployment scenarios, while maintaining power efficient operation of devices. • To address the needs of battery powered devices, this amendment defines modes of operation that, while improving average throughput, also improve or maintain the average power efficiency per station. • The new standard operates in the below 6 GHz frequency bands excluding sub GHz frequencies.. The new amendment shall enable backward compatability and coexistence of legacy IEEE 802.11 devices operating in the same band. Yong Liu, et al.

11. SP3 • Do you support the text change on slide 7? Yong Liu, et al.