1. IEEE 802.21 MEDIA INDEPENDENT HANDOVER DCN: 21-10-0225-00-srho-802-21c-requirements-and-procedures Title: 802.21c Requirements and Procedures Date Submitted: November 10, 2010 Presented at IEEE 802.21 Session #41, Dallas Authors or Source(s): Hongseok Jeon, Junghoon Jee, Changmin Park (ETRI) Abstract: This contribution summarizes 802.21c requirements and procedures based on DCN 21-10/0214r0. 1

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 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 2

3. 802.21c Requirements (1/3) Req. 01: General solution The defined mechanism shall be general so that it can be applied to the single radio mobile station whether it activates the dual receivers for both access networks or only single receiver for the current access network. The defined mechanisms shall be general enough so that they can be applicable to various IWK scenarios (e.g., WiMAX-3GPP, WiMAX- WiFi, 3GPP-WiFi, etc.). Req. 02: Low impact on existing system The impact on existing access network architectures (3GPP, 3GPP2, WiMAX, WiFi) shall be minimized. Req. 03: Media-independent container for transport of L2 information The mechanism shall define the way to deliver radio measurement configuration and report the measurement result within a media- independent container for single radio mobile station. 3

4. 802.21c Requirements (2/3) Req. 04: Defining tunneling mechanism The mechanism shall define the tunneling mechanism to deliver the pre-registration messages. Req. 05: Managing pre-registered state and context The defined mechanism shall provide a way to control pre-registered states and deliver pre-registered contexts to enable single-radio operation. Req. 06: Assisting SRHO enabling network entity detection and target network selection The mechanism shall assist the mobile station to detect the presence of SRHO enabling network entity before attaching to the target access network. The mechanism shall assist the mobile station to select appropriate target network and the corresponding required information from the access network. 4

5. 802.21c Requirements (3/3) Req. 07: Discovering following capabilities of mobile station and network; Supported RATs on mobile station (3GPP, WiMAX, WiFi, etc.) Whether the network supports SRHO or DRHO Applicable frequencies bands per access technology Transmit configuration on mobile station (Single/Dual) Receive configuration on mobile station (Single/Dual) UL/DL measurement gaps on mobile station which does not support simultaneous transmission/reception Whether the networks is allowing pre-registration 5

6. 802.21c SRHO Procedures (1/7) 6 21c MIH PoS: Network entity enabling SRHO to MN

7. 802.21c SRHO Procedures (2/7) Phase 1: Discovering 21c MIH PoSs on the candidate networks. MN recognizes if candidate networks supports SRHO or DRHO. If some candidate network supports SRHO, the MN tries to detect the presence of a 21c MIH PoS on the candidate network. MIIS provides information to discover the SRHO capability and detect the presence of the 21c MIH PoS. 7

8. 802.21c SRHO Procedures (3/7) Phase 2: Setting up a communication channel between the MN and 21c MIH PoSs. Phase 2 ensures a secure communication channel to be used for pre-registration. MIIS provides information about secure protocols and mechanisms used for establishing the secure communication channels. 8

9. 802.21c SRHO Procedures (4/7) Phase 3: Inter-RATs information acquisition and report. MN acquires the information to find out the existence of candidate PoAs in the vicinity of its current location and corresponding SIBs of candidate PoAs to perform the radio measurements. Pull mode or push mode of MIIS can be used to convey such information. 9

10. 802.21c SRHO Procedures (5/7) Phase 4: Pre-Registration MN performs a registration to 21c MIH PoSs on the candidate networks via the secure communication channels. By helping of the 21c MIH PoSs, MN can perform network entry procedures toward the candidate networks while retaining its data connection with the serving network. MIH protocol encapsulates and delivers media specific messages that are exchanged for the network entry. 10

11. 802.21c SRHO Procedures (6/7) Phase 5: Checking Inter-RATs radio link status. MN checks link status of a serving PoA and all available candidate PoAs to see whether the handover toward the pre-registered candidate network is required at that point of time. With the result of checking link status, MN selects a Target PoA. 11

12. 802.21c SRHO Procedures (7/7) Phase 6: SRHO execution MN switches its transmission mode from serving PoA to the target PoA and then tries to connect to the target PoA. Context transfer could occur between the 21c MIH PoS and the target PoA to expedite the handover process. 12