1. Coordinated AP for tightly coupled BS-AP interworking for Multi-RAT devices IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S802.16ppc-10/0066 Date Submitted: 2010-11-10 Source: Youngsoo Yuk, Eunjong Lee, Heejeong Cho and Inuk Jung youngsoo.yuk@lge.comyoungsoo.yuk@lge.com LG Electronics Venue: IEEE Session #70 Base Contribution: IEEE C802.16ppc-10/0066 Purpose: To be discussed by PPC 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. Release: 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 802.16. Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and.http://standards.ieee.org/guides/bylaws/sect6-7.html#6http://standards.ieee.org/guides/opman/sect6.html#6.3 Further information is located at and.http://standards.ieee.org/board/pat/pat-material.htmlhttp://standards.ieee.org/board/pat

2. What is heterogeneous network?  It means multiple networks (e.g., Wi-Fi, Wi-Bro, WCDMA and so on) with their corresponding radio access technologies.  By using the interworking mechanisms, the following benefits can be provided. Cost-efficient capacity enhancement Seamless mobility Ubiquitous service access

3. Necessity of coordination between the networks  Limitations of the interworking without coordination High power consumption for detecting other network (e.g., WLAN AP) In-device interferences between networks (e.g., cellular and WLAN)  Therefore, control connection for coordination is required.  It has already been implemented in the working document “study report on hierarchical networks (IEEE 802.16ppc-10/0008r1)”.  However, there are no descriptions of key features and requirements for the coordination. Figure 5 (a): Network offloading traffic for Multi-RAT client to 802.11 network

4. How is coordination done between BS and AP?  We define an AP that is able to cooperate and be coordinated by a BS. We name such an AP a Coordinated AP (a.k.a C-AP)  C-AP provides cellular control connection for BS-AP coordination as well as WLAN connectivity to devices and wired backhaul.  The BS has control over the C-APs under its coverage. This means that the C-AP is able to perform certain functions that is commanded by the BS.

5. Possible scenarios  Sharing access information BS provides access information on C-AP to a device connected to the BS.  Reducing power consumption for detecting C-APs C-AP provides access information of BS to a device connected to the C-AP.  Helps devices to perform handover to neighbor BS from C-AP  Inter-AP coordination Coordinated Dynamic Channel Switching in the coverage area with heavy interference Coordinated Dynamic Transmission Power Adjustment for mitigating interference between APs Coordinated Capacity Sharing among APs for load balancing purpose  Integrated QoS/Connection management Prioritized device scheduling Integrated security association

6. Proposed Text on IEEE 802.16ppc-10/0008r1 [Insert the following text ] 2.2.x BS-AP interworking by coordinated AP (C-AP) In order to provide higher level of interworking function, cellular BS and WLAN AP may help each other through the wired and wireless connection. Hierarchical relations based on the coverage are defined between cellular BS and WLAN APs, and BS may provide configuration/coordination information to the WLAN APs in order to increase the interworking benefits. Coordinated AP (C-AP) is a WLAN AP which has wireless connectivity to BS. A BS has controllability on the C-APs under its coverage. The BS and C-APs may have communication channel to talk to each other. The BS and C-APs can communicate for interworking. The C-APs can communicate with each other via BS’s relaying and/or moderation. 4.2 Multi Radio Access Technology [R-X] IEEE 802.16 BS shall be able to communicate with IEEE 802.11 AP under its coverage via wired and/or wireless (e.g., 802.16 air interface) control connection for interworking operation. IEEE802.16 BS should be able to configure and control the operation and configuration of the IEEE802.11 APs under its coverage.