1. 1 IEEE 802.21 MEDIA INDEPENDENT HANDOVER DCN: 21-06-0747-00-0000-Idle-Mode-and-Paging Title: Media Independent Paging Service Date Submitted: November, 2006 Presented at IEEE 802.21 session #17 Dallas Authors or Source(s): Muthaih Venkatachalam, Shweta Shrivastava, James Tsai, Emily Qi, Vivek Gupta (Intel Corporation) Abstract: This presentation talks about standard message and primitive requirement in support of Media Independent Paging Service in multi-radio environment.

2. 2 IEEE 802.21 presentation release statements This document has been prepared to assist the IEEE 802.21 Working Group. 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. 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 802.21. The contributor is familiar with IEEE patent policy, as outlined in Section 6.3 of the IEEE-SA Standards Board Operations Manual and in Understanding Patent Issues During IEEE Standards Development http://standards.ieee.org/board/pat/guide.html> Section

3. 3 Agenda Motivation Idle Mode and Paging Paging in multi radio environment Standard Message and Primitive Requirements

4. 4 Motivation For a single radio MN, idle Mode and Paging has already been proposed independently in WiMax, 3GPP and WiFi to extend battery standby time In a multi radio environment, the MN may have multiple radios and each radio may be in “connected” or “idle” state. There is an opportunity to provide paging service via “connected” radio and aggregate paging messages across multi radios –Fewer paging messages across network infrastructure –Fewer number of active radios on MN Multi Radio Paging can lead to considerable power saving at the MN and also provide radio/network/device resource optimization at the mobile communication infrastructure

5. 5 Use Case of Idle Mode & Paging with a single Radio Data packets Paging Controller Idle Mode messages Enter Idle Mode Location Update Exit Idle Mode PagingPaging PagingPaging Data packets

6. 6 3GPP- LTE Paging 3GPP-LTE Network Architecture 3GPP-LTE Paging Protocols UE enters IDLE mode when there is no activity. Discontinuous Reception (DRX) – UE uses DRX in IDLE mode, i.e. wakes up periodically to check for paging messages. UE learns DRX cycle length upon network entry from the eNodeB. UE is registered at Tracking Area Level.

7. 7 WiMAX Paging Paging controller (PC) is a logical entity that administers activity of Idle mode MS. It may be co-located with BS or ASN Gateway. A PC may monitor one or more paging groups. Paging Agent (PA) entity, co-located with BS, handles the interaction between PC and paging functionality implemented in BS. Location Register (LR) is a database that contains information about Idle mode MSs. PC is responsible for sending paging messages and handling location updates.

8. 8 WLAN Paging Idle Mode Operation –STA advertises Paging Capability Discovery –Non-AP STA enters Idle Mode –AP broadcasts Paging Indications (partial virtual bitmap), and STA wakes up to receive paging indication –Non-AP STA exits Idle Mode Paging Group (PG) - a group of APs in which STA can be paged –A Mobility Domain comprises one or more Paging Groups –A STA must reassociate if it transitions to an AP in a different Paging Group Paging Server –Provides Paging Services and Paging key management –Serves one or more Paging Groups Paging group #1 Paging group #2 Paging Server #2 Paging group #3 Paging Server #1

9. 9 Paging Summary in a single radio environment For each individual Radio, Key Paging Messages –Paging Capability Discovery –Enter/Exit Idle Mode –Location Update (sent by MN aka Idle Mode Update) MS sends location update to the infrastructure –Paging Indication (sent by infrastructure) MS periodically wakes up to check whether it is being paged or not Key Concept and Logical Entity –Paging Group –Paging Server (or Paging Controller)

10. 10 Multi Radio Paging and Benefits In a multi radio environment, the MN may have multiple radios and each radio may be in “connected” or “idle” states Multi Radio Paging Benefits –All Paging messages via the “connected” radio Paging Indication Message sent via the “connected” radio Location Update via the “connected” radio –Paging aggregation minimizes message exchange Paging Indication Message aggregation Location Update aggregation Idle Mode Enter/Exit aggregation Therefore, what do we need from standards ?

11. 11 Proposed Standard Engagements IEEE 802.21: Standard Message Primitives –Paging capability Primitives –Location Update Primitives –Enter/Exit Idle Mode (Radio State update) Primitives –Paging Indication Primitives IEEE 802.16, 802.11, LTE (?): MAC layer messages –RAN specific Containers/Transport to carry above messages IETF/3GPP: IP Layer messages (back end) –Messages between Paging Controllers –Between Paging Controller and PoA (BS/AP).

12. 12 Call to Action Form a study group in 802.21 to study Paging service in multi radio environment Investigate requirement for standards based multi radio primitives

13. 13 Reference 21-06-0701-00-0000-Media independent idle mode and paging.ppt, by Muthaih Venkatachalam (Intel Corporation) 11-06-0950-04-000v-wlan-paging-and-idle-mode.ppt, by Emily Qi et al

14. 14 Backup

15. 15 Paging via “connected” radio MSG #1, #2, #3, #4, and #5: IETF BS/AP Paging Announcement Primitives: IEEE 802.21 Possible Contents: Paging and Paging Media/Radio Interface MS receiving Paging Announcement Primitives: IEEE 802.21 Possible Contents: Paging and Paging Media/Radio Interface Scenario –User is browsing on the WiFi interface –User gets a voip call on the WiMAX interface. –WiMAX network needs to page the user

16. 16 Location Update via “connected” radio User has WiFi connection that is currently active and WiMAX connection that is idle. Instead of contending on the WiMAX airlink, MS uses the WiFi radio to perform location update for its WiMAX radio All MSGs: IETF BS/AP Location Update Request/Response Primitives: IEEE 802.21 Possible Contents: Paging and Paging Media/Radio Interface, Location Information MS Location Update Request/Response Primitives: IEEE 802.21 Possible Contents: Paging and Paging Media/Radio Interface, Location Information

17. 17 Aggregated Location Update If the PGs are overlapping, perform a single LU operation for multiple radios. Minimizes messaging and processing at the MS BS/AP Location Update Request/Response Primitives: IEEE 802.21 Possible Contents: Paging and Paging Media/Radio Interface, Location Information MS Location Update Request/Response Primitives: IEEE 802.21 Possible Contents: Paging and Paging Media/Radio Interface, Location Information MSGs: IETF Extended Location Update Message for Multi radio: IEEE 802.16, 802.11

18. 18 Paging-aggregation Page on a single idle radio to wake up multiple idle radios. Extended Paging Announcement Message for Multi radio: IEEE 802.16, 802.11 MS receiving Paging Announcement Primitives: IEEE 802.21 Possible Contents: Paging and Paging Media/Radio Interface BS/AP Paging Announcement Primitives: IEEE 802.21 Possible Contents: Paging and Paging Media/Radio Interface

19. 19 Idle mode Entry/Exit Scenario: Multiple radios are switched to idle mode –For example: when the user takes a break, his WiMAX, WiFi and 3G connections may go into idle mode IM Entry/Exit for radios i, j, k happens on radio-i. MSGs: IETF (IP Paging?) MS Enter/Exit Idle Mode Request/Response Primitives: IEEE 802.21 Possible Contents: Paging and Paging Media/Radio Interface, Location Information BS/AP Enter/Exit Idle Mode Request/Response Primitives: IEEE 802.21 Possible Contents: Paging and Paging Media/Radio Interface, Location Information Extended Idle Mode Request/Response messages for Multi radio: IEEE 802.16, 802.11