Transmission Modes for Multi-Radio Access in Hierarchical Networks [IEEE 802.16 Presentation Submission Template (Rev. 9.2)] Document Number: IEEE C80216ppc-11_0015 Date Submitted: 2011-11-05 Source: Hyukjoon Lee Voice: Kwangwoon University E-mail: hlee@kw.ac.kr *<http://standards.ieee.org/faqs/affiliationFAQ.html> Re: IEEE 802.16ppc-11/0005r1 and IEEE L802.16-11/0058r1 Base Contribution: None Purpose: For discussion in the Project Planning Committee Notice: This document does not represent the agreed views of the IEEE 802.16 Working Group or any of its subgroups. It represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material contained herein. Copyright Policy: The contributor is familiar with the IEEE-SA Copyright Policy <http://standards.ieee.org/IPR/copyrightpolicy.html>. Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: <http://standards.ieee.org/guides/bylaws/sect6-7.html#6> and <http://standards.ieee.org/guides/opman/sect6.html#6.3>. Further information is located at <http://standards.ieee.org/board/pat/pat-material.html> and <http://standards.ieee.org/board/pat >.

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.

Hierarchical Networks in Multi-RAT Deployment Scenarios 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

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

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’

There are different ways that flows can make use of multi-RAT links 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?