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Station Group Management for 802.11ah

Station Group Management for 802.11ah. Date: M ay 10 , 20 11. Author: . Abstract. This contribution addresses One of potential MAC change issues regarding “high STA density per BSS” T he need of STA group management, related mainly to IEEE 802.11ah Use Case 1 – Sensors and meters.

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Station Group Management for 802.11ah

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  1. Station Group Management for 802.11ah Date:May 10, 2011 Author:

  2. 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

  3. 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”

  4. 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

  5. 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

  6. STA Grouping • Example of STA grouping with multiple BSSIDs • Location based • Application type based

  7. 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

  8. 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.

  9. 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

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