IEEE 802'15 subject

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Project IEEE P802.15 Working Group for Wireless
Personal Area Networks (WPANs) Submission Title
Proposal for PostBeaconDelay in 802.15.4b Date
Submitted 17 November, 2004 Source Myung
Lee, Yong Liu, Chunhui Zhu, Huai-Rong Shao, Hoin
Jeon Company Samsung Lab _at_ CUNY, Mitsubishi
Electric Research Lab, Kyungwon
University Address T677, EE Dept. Steinman Hall
140th Street and Convent Ave, NY, NY 10031
Voice212-650-7260, FAX [phone],
EMaillee_at_ccny.cuny.edu Re Response to the
call for proposal of IEEE 802.15.4b, MAC
Enhancement . If this is a response to a Call
for Contributions, cite the name and date of the
Call for Contributions to which this document
responds, as well as the relevant item number in
the Call for Contributions. Note Contributions
that are not responsive to this section of the
template, and contributions which do not address
the topic under which they are submitted, may be
refused or consigned to the General
Contributions area. Abstract Proposal of
adding macSelfPostBeaconDelay and
macParentPostBeaconDelay to IEEE 802.15.4b to
enable potential beacon scheduling in higher
layer Purpose For the discussion at IEEE
802.15.4b Task Group 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.
NOTE Update all red fields replacing with your
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1. Add two new attributes to table 71
Table 71MAC PIB attributes
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2. Add a new subfield to the superframe
specification field
Figure 40Format of the superframe specification
field

• Assumption 15.4b devices can recognize the new
  postBeaconDelay subfield with the knowledge of
  version number.

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3. Change text in the fourth paragraph of 7.5.1.1

• The beacon shall be transmitted, without the use
  of CSMA, at the start of slot 0, and the CAP
  shall start macSelfPostBeaconDelay symbols after
  the beacon to avoid possible conflicts with the
  beacons from other coordinators.

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4. Change text in the first paragraph of 7.5.1.1.1

• A coordinator shall start its CAP
  macSelfPostBeaconDelay symbols after it transmits
  the beacon. The CAP shall complete before the
  beginning of the CFP on a superframe slot
  boundary.
• A device shall follow its parents CAP
  macParentPostBeaconDelay symbols after it
  receives the beacon from its parent.

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5. Change text in the ninth paragraph of 7.5.1.3

• In a slotted CSMA-CA system with the battery life
  extension subfield set to 1, the MAC sublayer
  shall ensure that, after the random backoff, the
  remaining CSMA-CA operations can be undertaken
  and the entire transaction can be transmitted
  before the end of the CAP. The backoff countdown
  shall only occur during the first six full
  backoff periods after the starting point of the
  CAP.