1. Multi-Radio Integration for Heterogeneous IEEE 802.16 Network Beyond 4G IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE C802.16-10/0015 Date Submitted: 2010-03-14 Source: I-Kang Fu, Paul Cheng IK.Fu@mediatek.comIK.Fu@mediatek.com MediaTek Inc. Venue: Orlando, FL, USA Base Contribution: This is base contribution Purpose: For discussion in the Project Planning Adhoc 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. 2 Introduction Huge demand on broadband wireless access will be stimulated in 4G era –~1Gbps peak transmission rate in wireless network can provide users similar experience as in wireline network Peak transmission rate should be no longer a critical problem after 4G era –Most of the existing Internet services can be carried by 4G wireless networks Mobile Internet becomes reality and further stimulate more advanced services and change the human life again The network capacity will be exhausted very soon in next few years –The spectral efficiency is improved less than ×10, but the capacity demand is increased more than ×100. –The capacity will still be exhausted very soon even all the networks are upgraded with 4G air-interface Capacity exhaustion will be the most severe problem during the 4G and Beyond (B4G) era

3. 3 Introduction Different candidate technologies can possibly help on capacity improvement –Heterogeneous network –Cooperative techniques –Advanced MIMO –etc. Heterogeneous network may be the most promising candidate technology –The room for intra-system optimization (i.e. further increase spectral efficiency) will be bounded by multiple access interference (e.g. inter-cell) –However, the spectrum resources today are not efficiently utilized because different network may not be able to share spectrum resources with each other. Because the traffic and network loading distribution is time variant, but operator need to deploy the network base on worse case. This problem may be resolved without change of PHY but mostly by MAC enhancement

4. 4 Problem Discussion Multiple radio access networks between information source and user –May be operated by the same air-interface (e.g. different operators) Single tier network → can be resolved by existing roaming solution –May be operated by different air-interfaces Heterogeneous network → new technologies are required to enable radio resource sharing

5. 5 Problem Discussion Two design perspective need to be considered when discussing heterogeneous network problems: 1.Network perspective 2.Device perspective Technology evolution may be categorized into three stages: (example) 1.Coexistence Interference mitigation 2.Cooperation Smart Internetworking 3.Cognition Internetwork radio resource sharing

6. 6 Multi-Radio Integration Challenges Challenges to support heterogeneous network from device perspective –Stage 1: Interference mitigation for co-located multi-radio coexistence Objective – mitigate the interference from co-located modem to improve modem performances –FDM based solution (i.e. filtering) may not work when the frequency channels are too close (e.g. between ISM band and 2.3GHz band) –Protocol based solution may be required under some scenario –Ongoing efforts in many different standard organizations BB: Baseband module RF: Radio Frequency module ANT: Antenna module

7. 7 Multi-Radio Integration Challenges Challenges to support heterogeneous network from device perspective –Stage 2: Smart interworking for co-located multi-radio component sharing Objective – efficient internetworking to help device maintain connections in multiple systems by shared hardware (e.g. RF module) –For example, new protocol to help device fast switching between two system without losing control signals. –Maintain logical connection may still be maintained in parallel if necessary

8. 8 Multi-Radio Integration Challenges Challenges to support heterogeneous network from device perspective –Stage 3: Intelligent spectrum sharing for cognition by fully integrated radio Objective – optimize the radio (spectrum) resources among multi-tier heterogeneous network by minimizing the duplicated hardware functions (FFS) –Prevent unnecessary waste on spectrum resource, transmit power and processing power.

9. 9 Summary Heterogeneous Network is the most promising technology which can significantly resolve the capacity exhaustion problem in Beyond 4G era –New technology need to be developed both from network and device perspectives Development task may be categorized into multiple stages –Stage 1: Multi-radio & Heterogeneous Network Coexistence –Stage 2: Multi-radio & Heterogeneous Network Cooperation –Stage 3: Multi-radio & Heterogeneous Network Cognition Recommendation –Consider the requirements both from multi-radio network and device perspectives within the scope of new project