Month Year doc.: IEEE 802.15-08/0xxxxr0 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: study of PHY requirements for non-medical BAN Date Submitted: May 12, 2008 Source: Kiran Bynam, Giriraj Goyal, Ranjeet Kumar Patro, Arun Naniyat, Noh-Gyoung Kang, EunTae Won Contact: Kiran Bynam, Samsung Electronics Voice: +91 80 41819999, E-Mail: kiran.bynam@samsung.com Re: [] Abstract: brief study on PHY requirements Purpose: To discuss the PHY requirements of non-medical BAN 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 in May’08 it would be made publicly available by P802.15. 1 Kiran Bynam, Samsung

Agenda PHY Requirements derived from Technical requirement Problems of the BAN PHY requirements PHY requirements from applications

PHY requirements Scalability (10 KBPS to 10 MBPS) Latency Complexity and power consumption RF cost

Scalability Requirement Individual node data rate requirement – 10 KBPS to 10 MBPS Aggregate data rate requirements - 1 MBPS to 10 MBPS Scalability factor of 1000 times

Scalability of Modulation Schemes Scalability factor of 3 for PAM, PSK. Additional 4-5 dB Eb/No requirement for scaling up of data rate More than 20 dB of Eb/No required for 16-PAM Scaling up from 8-PSK to 16-PSK required 5-6 dB of Eb/No .

Scalability of Modulation Schemes (Cont’d) Scalability factor of 6 for QAM Additional 2-3 dB Eb/No requirement for scaling up of data rate Can go up to 64 QAM for a reasonable SNR (16 dB Eb/No)

Extension of scalability factor Eb/No requirement of less than 20 dB is reasonable for BAN. probable scalability factor of 6, for a fixed bandwidth FEC techniques might improve the scalability factor by 2 or more.

Power consumption for BAN Major power consumption factors in short range networks Synchronization and Channel estimation complexity SNR requirements for demodulation and detection Power required for Linear PA and other amplifiers Transmitter baseband processing Transmit Power

Power consumption for BAN Non-constant envelope High Linearity requirements of RF PA Relatively low Receiver sensitivity Constant envelope Requires coherent detection and demodulation Accurate information of phase is required The Linearity requirements of the amplifiers used in Transmitter and Receiver are low.

Effects of changing the bandwidth Additional scalability factor can be achieved by changing the bandwidth Increase in MAC complexity due to channel sensing in different frequency bands Use of different type of receiver algorithms Design Challenges will be different at different data rates Increase in form factor and cost

Effects of changing the bandwidth At low data rates, the carrier offset compensation is relatively complex. Channel estimation complexity increases with bandwidth.

Application Requirements Streaming Audio/Video 3% PER for audio, < 150 msec delay 1% PER for video, < 150 msec delay Data rate of 256 KBPS, 1 M, 5 M File transfer 1% PER, < 10 sec delay Data rate upto 10 MBPS Control applications, Interactive games 250 msec of delay Data rate upto 256 KBPS Need for reduced scalability factor single PHY for all the commercial wearable BAN applications Form factor MAC complexity

Latency requirement Some real time applications require good compromise of the latency and PER Error control coding can be used. Applications like Control, Static file transfer does not have high latency requirements Required QOS can be achieved by scaling down data rates and repeated transmission.

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