Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [ Improve the latency between GTS request and usage] Date Submitted: [31 Aug, 2008] Source: [Betty Zhao, Yongjun Liu] Company [Huawei Technologies, Co., Ltd.]

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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

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Project ieee p802 15 working group for wireless personal area networks wpans

Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

Submission Title: [Improve the latency between GTS request and usage]

Date Submitted: [31 Aug, 2008]

Source: [Betty Zhao, Yongjun Liu] Company [Huawei Technologies, Co., Ltd.]

Address [Kuike Building, 9 Shangdi Xinxi Road, Haidian District, Beijing 100085]

Voice: [86 10 82836033], Fax: [86 10 82836920],

Email: [[email protected], [email protected]]

Re: [15-08-0373-01-004e-call-for-proposals]

Abstract:[This document proposes a method to improve the latency between GTS request and usage by enhancing IEEE 802.15.4-2006 MAC.]

Purpose:[This document is a response to Call for Proposals.]

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.

Huawei Technologies Co., Ltd.


Improve the latency between gts request and usage

Improve the latency between GTS request and usage

Betty Zhao, Yongjun Liu

Huawei Technologies Co., Ltd.

Huawei Technologies Co., Ltd.


Gts allocation procedure and problem

GTS allocation procedure and problem

  • The device sends GTS request command and receives acknowledgement from the coordinator.

  • The device starts to track beacon for GTS descriptor from the next superframe.

  • The device uses GTS or request GTS again according to GTS descriptor.

    - Problem: if the device fails to track beacon, it must wait for at least one more beacon interval to start using GTS, which is a big latency for the data to be transmitted in GTS for lower latency.

Huawei Technologies Co., Ltd.


Gts allocation procedure and problem1

Inactive

GTS

GTS

CAP

CAP

GTS

GTS

GTS

GTS

Device

Fail to track beacon

Can’t use this GTS

Track beacon successfully

Start to use GTS

OR

Request GTS again in the next CAP

If the device fails to track the beacon, either its GTS transmission or GTS re-request will be delayed for at least a beacon interval.

GTS allocation procedure and problem

Huawei Technologies Co., Ltd.


Proposed solution

Proposed Solution

  • Precondition

    - According to “7.5.4.1: All devices operating on a beacon-enabled PAN shall be able to acquire beacon synchronization in order to track the beacon.”, a device known beacon synchronization can be aware of its failure of tracking the beacon.

Huawei Technologies Co., Ltd.


Proposed solution1

Proposed Solution

Step 1:

  • The device sends a command (GTS information request command) to coordinator immediately after finding it failing to track the beacon (during CAP).

    Step 2:

  • On reception of GTS information request command, coordinator sends the GTS information and timestamp to the device before CFP.

    Step 3:

  • The device synchronizes with coordinator through timestamp and then uses GTS or requests GTS again according to the received GTS information.

Huawei Technologies Co., Ltd.


Proposed solution2

GTS

CAP

GTS

Inactive

GTS request command in 15.4

7

1

MHR fields

Command Frame Identifier (TBD)

GTS information request command

Coordinator

GTS information and timestamp

GTS information request command

Use GTS

Device

Find it failing to track beacon

7

Synchronize with coordinator

1

1

MHR fields

Command Frame Identifier (0x09)

GTS Characteristics

Proposed Solution

Huawei Technologies Co., Ltd.


Proposed solution3

Proposed Solution

  • If “GTS information request command” is sent during CAP,

    - The command contains an acknowledgment request, and the PAN coordinator shall confirm its receipt by sending an acknowledgment frame.

    - In order for successful transmission, the device can send the command more than once until receiving the acknowledgment.

  • If “GTS information request command” is sent during CFP,

    - The PAN coordinator will check the Command Frame Identifier subfield of the received MAC command frame.

    - If it’s GTS information request command, the PAN coordinator will accept and process it.

Huawei Technologies Co., Ltd.


Thank you

Thank you!

Huawei Technologies Co., Ltd.


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