WLAN Paging and Idle Mode Month Year June 2006 July 2006 WLAN Paging and Idle Mode Date:2006-07-13 Authors: Notice: This document has been prepared to assist IEEE 802.11. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.11. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures <http:// ieee802.org/guides/bylaws/sb-bylaws.pdf>, including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair <stuart.kerry@philips.com> as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE 802.11 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at <patcom@ieee.org>. Emily Qi et al Emily Qi et al

Month Year June 2006 July 2006 Abstract This document outlines a WLAN Paging and Idle normative text proposal (doc#06/0943r2) in support of Power Saving objective in accordance with REQ2010. This is a merged proposal of WLAN Paging (06/656r0, Qi et al) and Idle Mode Operation (06/349r0, Jin et al). Emily Qi et al Emily Qi et al

Agenda Power Saving Goal Power Consumption Analysis Month Year June 2006 July 2006 Agenda Power Saving Goal Power Consumption Analysis WLAN Paging and Idle Mode Concept WLAN Paging Protocol Emily Qi et al Emily Qi et al

Month Year June 2006 July 2006 Power Saving Goal Extend standby hours for handheld and Ultra Mobile PC (UMPC) to support applications such as VoIP over WLAN Emily Qi et al Emily Qi et al

Power Consumption Issues Month Year June 2006 July 2006 Power Consumption Issues Overhearing broadcast/unicast messages at Rx Scanning Overhead for AP Selection Number of BSS transitions while roaming OS wakes up to call supplicant Derives the keys: PMKR1 and PTK Sends and receives authentication and reassociation messages Emily Qi et al Emily Qi et al

Introducing Idle Mode and WLAN Paging Month Year June 2006 July 2006 Introducing Idle Mode and WLAN Paging Idle Mode : STA enters “deep sleep” if there is no outgoing/incoming traffic STA wakes up at a longer “sleep” interval (e.g 2.1s) to check if there is any incoming frame If STA roams out of the coverage area of the last known associated AP, STA doesn’t need to reassociate with a new AP when it is in “idle mode” WLAN Paging: Infrastructure will “find” the client if there is incoming traffic STA will reassociate with a new AP when it receives the notification of incoming traffic from infrastructure Emily Qi et al Emily Qi et al

WLAN Paging and Idle Mode Concept Month Year June 2006 July 2006 WLAN Paging and Idle Mode Concept Paging Concepts Paging Domain (PD) PD is a set of BSSs within the same ESS Paging Group (PG) PG is a logical group of APs in which STA can be paged A PD comprises one or more PGs Paging Server Provides Services: Paging and Keying Can be in the AP or a separate network entity Paging Procedures Paging Capability Discovery and Advertising STA Enter/Exit/Update Idle Mode APs periodically broadcast Paging Indication STA wakes up to receive paging indication Paging Service in AP Paging Service in a separate network entity Emily Qi et al Emily Qi et al

STA Operations STA enters Idle Mode Idle Mode Operation Month Year June 2006 July 2006 STA Operations STA enters Idle Mode The STA sends Idle Mode Request (enter) to its current AP for Paging Service Request (known as Home AP) Paging Server sends Idle Mode Response (succeed/or fail) with Idle mode keep-alive timer along with keying materials if Paging Service Protection is enabled The Home AP keeps the STA alive until paging server receives Exit Idle Mode Request Idle Mode Operation Paging Scan: STA wakes up to receive Paging Indication Passive Paging Scan and Active Paging Scan Idle Mode Update Keep-alive Update before keep-alive timer expires Paging Group ID update when the STA roams into a new Paging Group STA exits Idle Mode If a STA hears a paging, the STA exits the idle mode and scans channel to associate with an AP If it is still in the home AP area, no reassociation is required Emily Qi et al Emily Qi et al

Infrastructure Operation Month Year June 2006 July 2006 Infrastructure Operation Paging Server can be in the AP (distributed) or in a separate network entity (centralized) Paging Server maintains the paging service information for the STA in Idle mode STA MAC Address, Paging Group ID, Home AP (not needed if paging service is in the AP) Home AP maintains state for the Idle Mode STA If there is an incoming packet for the STA in Idle Mode, Home AP notifies the Paging Server to Find out the current paging group where STA belongs Request all of APs in the Paging Group to page the STA Emily Qi et al Emily Qi et al

Month Year June 2006 July 2006 Paging Scan Paging Scan: STA wakes up to receive Paging Indication Passive Paging Scan Listen to Beacon Scan and Broadcast Paging Indication Frame Active Paging Scan STA sends Probe Request to the visiting AP The visiting AP responds with Probe Response including the Paging Indication Element STA wakes up If the STA is still with the same BSS, the STA will wait for Paging Indication broadcast frame Beacon PI PI PI PI Home AP Paging Interval (e.g. 2.1s) Beacon PI PI Visiting AP Paging Interval (e.g. 2.1s) If the STA moves to a visiting AP, the STA scans for a new beacon and sync up with the new DPIM drifting time, or STA sends Probe Request to request the last PI element from the visiting AP. SIFS Emily Qi et al Emily Qi et al

Example of STA Operating at Idle Mode Month Year June 2006 July 2006 Example of STA Operating at Idle Mode Emily Qi et al Emily Qi et al

Month Year June 2006 July 2006 WLAN Paging Protocol Paging Capability and Paging Service Discovery (Beacon/Probe Response Paging Indication Broadcast Action Frame Probe Response Idle Mode Request and Response (unicast) Enter Idle Mode Exit Idle Mode Idle Mode Update for Paging Group ID and Keep-alive Emily Qi et al Emily Qi et al

WLAN Paging Message Flow Month Year June 2006 July 2006 WLAN Paging Message Flow Emily Qi et al Emily Qi et al

Feature Summary Idle mode operation to extend STA standby hours Month Year June 2006 July 2006 Feature Summary Idle mode operation to extend STA standby hours WLAN paging to wake up STA in order to receive incoming traffic Paging Server for deployment flexibility and scalability Paging Group for bandwidth efficiency and scalability Paging Service Protection for forgery protection between STA and Paging Server Emily Qi et al Emily Qi et al

References 06/349r0 Idle Mode Operation for IEEE 802.11v (Jin et al) July 2006 References 06/349r0 Idle Mode Operation for IEEE 802.11v (Jin et al) 06/656r0 WLAN Paging for Power Saving (Qi et al) Emily Qi et al

Month Year June 2006 July 2006 Motion Move to include normative text in document 06/0943r2 into the TGv draft. Mover: Second: Results: Emily Qi et al Emily Qi et al