1. Month Year
doc.: IEEE /0xxxxr0
Project: IEEE P 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: ,
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 P 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 P 1
Kiran Bynam, Samsung

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

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

4. 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

5. 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 .

6. 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)

7. 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.

8. 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

9. 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.

10. 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

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

12. 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

13. 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.

14. Thank You