1. 21-08-0196-00-mrpm IEEE 802.21 MEDIA INDEPENDENT HANDOVER DCN: 21-08-0196-00-mrpm-scenario6.4 Title: MRPM Scenario 6.4 Generalization Date Submitted: July 7th, 2008 Presented at IEEE 802.21 session #27 in Denver Authors or Source(s): Yoon Young An, Junghoon Jee, Changmin Park, Boo Geum Jung Abstract: This contribution proposes the remedies for the MRPM scenario, “Waking up WiFi interface via WiMAX paging”.

2. 21-08-0196-00-mrpm 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 6.3 of the IEEE-SA Standards Board Operations Manualhttp://standards.ieee.org/guides/opman/sect6.html#6.3 http://standards.ieee.org/board/pat/guide.html 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 stated in Section 6 of the IEEE-SA Standards Board bylaws and in Understanding Patent Issues During IEEE Standards Development http://standards.ieee.org/board/pat/faq.pdf> Section 6 of the IEEE-SA Standards Board bylawshttp://standards.ieee.org/guides/bylaws/sect6-7.html#6 http://standards.ieee.org/board/pat/faq.pdf

3. 21-08-0196-00-mrpm Overview There was a comment during the MRPM conference call that the current MRPM scenario, “Waking up WiFi interface via WiMAX paging” is too specific to particular access network technologies. This contribution proposes the remedies to generally describe the MRPM scenario which is described in the section 6.4 of the MRPM TR document.

4. 21-08-0196-00-mrpm Current Scenario 6.4 6.4 Waking up WiFi interface via WiMax Paging Alice has a hand-held dual mode MN which can access internet and receive VoIP call via technologies including WiFi and WiMAX. At work, the network operator provides her both WiFi and WiMAX access. If there is no incoming traffic for 2 minutes, Alice’s dual mode MN goes to sleep state for power saving. Considering the power consumption of WiFi in idle state is much higher than the power consumption of WiMAX in idle state, the dual mode MN turns off the WiFi radio, enters idle mode for the WiMAX radio, and listens for paging messages via WiMAX radio. Note, even though the WiFi radio is shut, Alice is still registered on the network to receive SIP calls on WiFi. If there is an incoming call for Alice, the multi-radio Paging controller will page Alice via WiMAX radio. Once the WiMAX radio receives the paging message, WiMAX radio will wake up the MN device, and MN device wakes up the WiFi radio. The WiFi radio will then associate with network infrastructure to receive the incoming call. This use case presents the benefit of utilizing WiMAX paging functionality for WiFi power saving since no paging supported in IEEE 802.11 radio. According to the current 802.11 Standard, WiFi radio has to perform frequent handovers among access points while traversing across multiple PoAs. Converting to WiMAX results in power savings at the MN.

5. 21-08-0196-00-mrpm Current Scenario 6.4 (cont.) 6.4 Waking up WiFi interface via WiMax Paging (cont.) The key operations to wake up the WiFi interface via WiMAX paging are given below. - Signaling between the multi-radio paging controller and the paging agent of the WiMAX network to deliver the paging message toward the WiFi interface. - The commands to wake up the WiFi interface in the mobile node.

6. 21-08-0196-00-mrpm Modified Scenario 6.4 6.4 Waking up the turned-off interface through the idle radio A hand-held multi mode MN can access Internet and receive VoIP call via technologies including WiFi, WiMAX and 3G. At work, the network operator provides her WiFi, WiMAX and 3G access. If there is no incoming traffic, some radios in multi mode MN go to sleep state and some radios are operated in idle mode for power saving. Considering the power consumption of the radio in sleep state is much higher than the power consumption of the idle-radio, the multi mode MN turns off the sleep-mode radio and the radio in idle–mode listens for paging messages. If the idle-radio receives the paging message, it will wake up the MN device, and MN device wakes up the turned-off interface. The waked radio will then be connected to network infrastructure to receive the incoming call. For example, Alice has a dual mode MN equipped with WiFi and WiMAX and is served SIP video call via WiFi radio. If there is no incoming traffic for the predefined interval, Alice’s dual mode MN turns off the WiFi radio and enters idle-mode for WiMAX radio. Note, even though WiFi radio is shut down, Alice is still registered on the network to receive SIP calls on WiFi interface. If there is an incoming call for Alice, the multi-radio paging controller will page Alice via WiMAX radio in idle mode. Once the WiMAX radio receives the paging message, it will wake up the WiFi radio. 6

7. 21-08-0196-00-mrpm Modified Scenario 6.4 (cont.) 6.4 Waking up the turned-off interface through the idle radio (cont.) This use case presents the benefit of utilizing idle radio paging functionality for WiFi power saving since no paging is supported in IEEE 802.11 radio. The key operations to wake up the turned-off interface via idle-radio paging are given below. O Signaling between the multi-radio paging controller and the paging agent of the idle- radio network to deliver the paging message toward the turned-off radio. O The commands to wake up the turned-off interface in the mobile node. O The events to notify that the paging message is arrived in the mobile node 7

8. 21-08-0196-00-mrpm MRPM enabled MIHF MRPM appl. 8 MNMRPCCN Command to turn off radio for power saving No traffic Video VoIP Call Paging for Video VoIP Call Paging for Video VoIP Call Event to announce paging for Video VoIP Call Command to wake up off-radio. Signaling for Video VoIP Call Modified Scenario 6.4 (cont.) Command to Stay idle-radio. in idle mode PoA of r_off Lower Layer WiFi WiMAX 3GPP 3GPP2 MRPM PA of r_idle Connect to network infrastructure Figure. 6 Waking up Off-radio via Paging to Idle-radio