Station Group Management for 802.11ah Month Year doc.: IEEE 802.11-yy/xxxxr0 Station Group Management for 802.11ah Date: May 10, 2011 Author: Name Company Address Phone email Jonghyun Park LG Electronics LG R&D Complex 533, Hogye-1dong, Dongan-gu, Anyang-shi, Kyungki-do, Korea +82-31-450-7117 jonghyun10.park@lge.com John Doe, Some Company
Accelerate Contribution November 2009 Accelerate Contribution Abstract This contribution addresses One of potential MAC change issues regarding “high STA density per BSS” The need of STA group management, related mainly to IEEE 802.11ah Use Case 1 – Sensors and meters LG Electronics, Inc.
Accelerate Contribution November 2009 Accelerate Contribution Motivation Possibility of a significant large number of STAs per AP [2] Smart grid – meter to pole (6,000 STAs per AP) Environmental / agricultural monitoring ( <300 STAs per AP) Industrial process sensors ( 500 STAs per AP) One BSS vs. Multiple BSSs per AP To manage “Thousands of STAs” LG Electronics, Inc.
Need for STA Group Management November 2009 Accelerate Contribution Need for STA Group Management In general, It may be manageable to control a large number of STAs, based on unique/similar characteristics of 802.11ah STAs, e.g., Short / infrequent / periodic traffic at large time intervals However, in some event-based/bursty traffic situations, “Thousands of STAs” may contend at the same time The likelihood of uplink collisions goes up LG Electronics, Inc.
Accelerate Contribution November 2009 Accelerate Contribution STA Group Management Group-wise STA management using multiple BSSID Each BSSID is assigned to a specific group of STAs AP can operate BSSID-specific contention periods to avoid a massive collision from a large number of contending STAs from other groups at the same time LG Electronics, Inc.
Accelerate Contribution November 2009 Accelerate Contribution STA Grouping Example of STA grouping with multiple BSSIDs Location based Application type based LG Electronics, Inc.
Comparison with Deploying Multiple APs November 2009 Accelerate Contribution Comparison with Deploying Multiple APs Pros of Multiple APs No enhanced MAC (and PHY) functionalities are required Cons of Multiple APs Additional AP deployment cost Collision issues may remain unresolved due to increased OBSS problem Assuming limited number of available channels (e.g., 917 – 923.5 MHz in Korea) Limited control of STA coordination across APs LG Electronics, Inc.
Accelerate Contribution November 2009 Accelerate Contribution Conclusion Group-wise STA management using multiple BSSID is desirable, regarding “high STA density” issues for IEEE802.11ah. Station group management mechanisms should be further discussed. LG Electronics, Inc.
References [1] IEEE P802.11 Wireless LANs, IEEE 802.11ah Call for proposals, IEEE 802.11-11/0198r0 [2] IEEE P802.11 Wireless LANs, Potential Compromise for 802.11ah Use Case Document, IEEE 802.11-11/0457r0 [3] IEEE P802.11 Wireless LANs, TGah STA Analysis for Smart Grid Use Case, IEEE 802.11-11/0355r0 [4] IEEE P802.11 Wireless LANs, Association ID management for TGah, IEEE 802.11-11/0088r0 [5] IEEE P802.11 Wireless LANs, Sub 1 GHz license-exempt MAC areas to consider, IEEE 802.11-10/1045r0