1. Submission Title: [Shared GTS Structure]
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [Shared GTS Structure]
Date Submitted: [Jan 14, 2008 ]
Source: [Paul Dixon, Pei Liu]
Company: [Hisilicon]
Address: [
Voice:[ ],
Re: [IEEE e group]
Abstract: [This proposal examines a mechanism to enhance the efficiency and throughput in systems by allowing traffic with lower bandwidth requirements to share GTS periods.]
Purpose: [To accompany discussion on e-shared-gts.doc.]
Notice: This document has been prepared to assist the Chinese WPAN group. 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 C- WPAN and may be made publicly available by C-WPAN.
Submission
Paul Dixon, Hisilicon

2. Outline Motivation Shared GTS Structure Modifications Submission
Paul Dixon, Hisilicon

3. Motivation
WPAN chips are deployed in many types of electronic devices, including personal devices, WSN devices, etc.
Different applications have different data length and QoS requirements.
The current superframe structure may not offer sufficient GTS slots for different QoS levels within one WPAN.
Submission
Paul Dixon, Hisilicon

4. Current GTS
In order to ensure the CAP period length, the total number of GTS is restricted to 7 slots.
Only one device (or pair-device) is allowed to use one GTS
The granularity of GTS is one slot, where it is too large for short data packets in many application scenarios.
Submission
Paul Dixon, Hisilicon

5. Shared GTS
A more flexible way to allocate and use GTS which allow devices to share one GTS for increased throughput and QoS
GTS requirement frame format includes the features of service
Allows a device to share a GTS with other device(s)
GTS is allocated based on resource and GTS requirement
Submission
Paul Dixon, Hisilicon

6. Shared GTS Structure Device A and B share one GTS Submission
Paul Dixon, Hisilicon

7. Modified GTS Request Command
Understand the issues involved in managing shared GTS
Provide a mechanism to ensure devices know which Supreframe period to use for their Shared Slot
Simplicity and efficiency are the key goals
Submission
Paul Dixon, Hisilicon

8. Modified GTS Request Command
Restrict the options as follows:-
00 Normal allocation of full GTS 01 Request for 1 in Request for 2 in 4 i.e. 1 in Request for 3 in 4
This should allow a significant improvement in efficiency
Submission
Paul Dixon, Hisilicon

9. Modified Beacon
Must contain a two bit count to which all devices synchronise
Allocation information for Shared GTS is as follows:-
Request for 1 in 4 Defines 1 in 4 to use Request for 1 in 2 Defines odd or even Request for 3 in 4 Defines start or unused
Submission
Paul Dixon, Hisilicon

10. Thank you!
Submission
Paul Dixon, Hisilicon