IEEE 802.21 MEDIA INDEPENDENT HANDOVER DCN: 21-11-0185-00-0000 April 2007 doc.: IEEE 802.11-07/0570r0 IEEE 802.21 MEDIA INDEPENDENT HANDOVER DCN: 21-11-0185-00-0000 Title: Transmission Modes for Multi-RAT networks Date Submitted: October 8, 2011 Presented at IEEE 802.21 session #47 in Atlanta, USA Authors or Source(s): Hyukjoon Lee (Kwangwoon University) Junghoon Jee (ETRI) Abstract: To propose three transmission modes to be considered for Multi-RAT networks 21-11-0185-00-0000 1 1

IEEE 802.21 presentation release statements April 2007 doc.: IEEE 802.11-07/0570r0 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 <http://standards.ieee.org/guides/bylaws/sect6-7.html#6> and in Understanding Patent Issues During IEEE Standards Development http://standards.ieee.org/board/pat/faq.pdf>  21-11-0185-00-0000 2 2

Introduction Multi-RAT technologies are widely accepted as a cost-effective alternative to capacity enhancement. Multiple wireless interfaces are common in newest mobile wireless devices such as smart phones. IEEE 802.11 and WCDMA IEEE 802.11 and IEEE 802.16e Hierarchical Network is currently being discussed as one of the candidate mobile network technologies for the future. 21-11-0185-00-0000

Hierarchical Networks in Multi-RAT Deployment Scenarios (1) Two multi-RAT usage scenarios are being considered: Virtual Carrier Simultaneous communication with both IEEE 802.16 BS and IEEE 802.11 AP Using both IEEE 802.16 and IEEE 802.11 connectivity for enhanced spectrum utilization IEEE 802.16 traffic offload via IEEE 802.11 link Enhanced Tethering (Multi-RAT Client Cooperation) Using IEEE802.11 link to communicate with a multi-RAT helper device Using both the direct IEEE 802.16 link and indirect IEEE 802.11 link to communicate with the IEEE 802.16 BS for enhanced spectrum utilization Link switching between direct IEEE 802.16 and indirect IEEE 802.11 links Need to discuss how transmission of data flows can be handled To propose three transmission modes of data flows 21-11-0185-00-0000

Hierarchical Networks in Multi-RAT Deployment Scenarios (2) Source: IEEE 802.16ppc-11_004r1 Hierarchical Network Study Report 21-11-0185-00-0000

Transmission Mode 1: Single-Link Flow A flow is assigned to either a direct IEEE 802.16 link or an indirect IEEE 802.11 link. Standardized negotiation procedures and IEs for link selection may be necessary Some criteria Signal strength AP/BS load QoS support Etc. Flow 1 Flow 2

Transmission Mode 2: Multi-Link Flow MPDUs belonging to a single flow are distributed among direct IEEE 802.16 link and indirect IEEE 802.11 link for enhanced spectrum utilization L2 reassembly function needed Use of IEEE 802.11 4-address structure/L2 tunneling Flow 1 21-11-0185-00-0000

Transmission Mode 3: Cooperative-Link Flow The same MPDUs (may be coded differently) of a flow are transmitted both on direct and indirect links Repeat diversity Transmit diversity Flow 1 Flow 1’ 21-11-0185-00-0000

Summary There are different ways that flows can make use of multi-RAT links Proposed three transmission modes: Single-link flows Multi-link flows Cooperative flows Contribution to update the Study Report? 21-11-0185-00-0000