Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Single Baseband Structure to support Multi RF] Date Submitted: [9 Sep. 2008] Source: [H.S.Lee, D. Y. Kim, C. S. Eun, S. M. Ryu] Company [ETRI, Chungnam Univ., Casuh] Address [220 Yuseong-gu, Gung-dong, Daejeon, Korea] Voice: [+82-31-709-5577, +82-42-821-6862], FAX: [+82-31-709-5578, +82-42-823-5586] E-Mail:[hsulee@etri.re.kr, dykim@cnu.kr, retaw@casuh.com] Re: [Contribution to IEEE 802.15.6 Meeting, Sep. 2008] Abstract: [We want to enhance QoS. and transmit high speed with low power structure. If we could support multi narrow band RF with single baseband chip without any interference among multi RF’s ; QoS & High Speed are not any more troublesome in WBAN.] Purpose: [Proposal] Notice: This document has been prepared to assist the IEEE P802.15. 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. Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15.

Single Baseband Structure to support Multi RF We want to enhance QoS and transmit high speed with low power structure. If we could support multi narrow band RF with single baseband chip without any interference among multi RF’s ; QoS & High Speed are not any more troublesome in WBAN. Sep. 2008 S. M. Ryu CASUH H. S. Lee ETRI D. Y. Kim and C. S. Eun Chungnam Univ.

Diversity Test Conditions Diversity Type Mode 1 : Frequency & Time Hybrid Diversity Mode 2 : Time Diversity with fixed frequency f1 Mode 3 : Time Diversity with fixed frequency f4 Test Method Diversity Number : 1 to 5 Test Trial Frame Number : 20,000 Test Path Case A : ~30m ; 1 soft board wall Case B : ~30m : opposite direction to Case A Case C : ~30m : 2 soft board wall Decision Rule Count number of Frame Error (CRC check) Count number of Sync Loss (128 bit frame) If we received one perfect frame among multi frames, we did not count as error

Diversity Test Frame Structure Mode 1: Time & Frequency hybrid Diversity d1, f1 d1, f2 d1, f3 d1, f4 d1, f5 d2, f1 Mode 2: Time Diversity with fixed frequency f1 d1, f1 d2, f1 Mode 3: Time Diversity with fixed frequency f4 d1, f4 d2, f4 Diversity number : 1,2,3,4,5 times

Frame Error Rate & Sync Loss Table # of frame error / # of Sync loss Test Path Diversity Mode Diversity Number 1 2 3 4 5 Case A Mode 1 5390 / 646 1563 / 29 667 / 3 282 / 0 210 / 0 Mode 2 3123 / 602 2293 / 316 2022 / 253 1874 / 230 1758 / 214 Mode 3 4506 / 1096 3258 / 902 2868 / 848 2666 / 825 2541 / 811 Case B 2700 / 329 106 / 2 9 / 0 1 / 0 0 / 0 3601 / 601 2487 / 303 2136 / 254 1945 / 237 1816 / 229 2361 / 422 1706 / 185 1457 / 135 1310 / 125 1215 / 111 Case C 8264 / 1272 3545 / 101 1536 / 8 637 / 0 480 / 0 4648 / 724 3416 / 424 2976 / 363 2750 / 332 2580 / 309 5640 / 961 4287 / 614 3749 / 514 3461 / 460 3280 / 418

Example : 1Mbps Time & Frequency Diversity d1, f1 d1, f2 d1, f3 d1, f4 d2, f1 d2, f2 d2, f3 d2, f4 Frame Format repeater 750Kbps 1M 4M RF #1 32MHz

Example : 1Mbps Frequency Diversity Frame Must be synchronized among RF’s RF #1 f1 1M Frame Format Mux/ Demux RF #2 f2 1M RF combiner 750Kbps 1M RF #3 f3 1M RF #4 f4 32MHz 1M

Single Baseband for Multi RF Concept Frequency Diversity High speed Tx with narrow band RF RF #1 f1 4M Frame Format Mux/ Demux RF #2 f2 4M RF combiner 12Mbps 16M RF #3 f3 4M RF #4 f4 32MHz 4M

Frame Structure example for scalable data rate 2msec 250μsec 128μsec 64μ 8μ 1500μsec 50μ Lock Preamble Tag AA Payload EOF 1Mbps 250K ~ 4Mbps Basic data rate Scalable data rate 750K / 1M 1.5M / 2M 3M / 4M 6M / 8M 12M / 16M Overhead : Payload = 1 : 3 Payload Data Speed = 750Kbps ; 1MHz clock

Conclusion Multi Preamble Concept is suitable for WBAN Reduce transmission time & Power consumption Enhance QoS by perfect frame synchronization by hybrid diversity Special Preamble is possible ; emergency, cell planning, multi RF etc Demerits of multi preamble is negligible 128bit correlator H/W is not burden now Longer Preamble length is not time loss Multi Preamble could support new service in WBAN application Supply tool to make single MAC to support scalable data rate Support special purpose service like emergence broadcasting Increase mobile channel capacity by Pico-cell Hand-over Planning Diversity, Selective Hopping, Service converging, etc Multi RF Structure is useful for low power WBAN implementation Synchronous frame concept can reject mutual interference among RF’s Narrow band RF is easy to design, low power consumption and low cost.