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Piggybacked Inter-Service Time

IST piggybacked on End of Service Period frames allows for non-PS-polled power save by enabling stations to sleep during IST period. It optimizes power save for non-TSPEC traffic, such as unicast Best Effort, promoting efficient network operation.

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Piggybacked Inter-Service Time

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  1. Piggybacked Inter-Service Time Menzo Wentink mwentink@intersil.com GlobespanVirata Menzo Wentink, GlobespanVirata

  2. INTRODUCTION • Inter-Service Time (IST) is the time to the next Service Period (SP) • The AP shall not transmit frames to the station during that time • IST is piggybacked on End of Service Period (EOSP) frames • Stations may go to sleep during IST period • IST is a flexible way to provide for non-ps-polled power save • IST allows for dynamic power save optimization under changing circumstances • IST works for non-TSPEC traffic, like unicast Best Effort • Imagine a hotspot with many active receivers. IST allows for stations to be asleep while the AP serves other nodes. This is not the case with current power saving, based on PS-Poll. • IST could also be TSF based value Menzo Wentink, GlobespanVirata

  3. Inter-Service Time EOSP frame EOSP frame Traffic to other stations SP SP Inter-Service Time (IST) Menzo Wentink, GlobespanVirata

  4. Implementation in 802.11e IST Menzo Wentink, GlobespanVirata

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