November, 2004 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 @ CUNY, Mitsubishi Electric Research Lab, Kyungwon University] Address [T677, EE Dept. Steinman Hall 140th Street and Convent Ave, NY, NY 10031 ] Voice:[212-650-7260], FAX: [212-650-8249], EMail:[lee@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 information; they are required. This is a manual update in appropriate fields. All Blue fields are informational and are to be deleted. Black stays. After updating delete this box/paragraph. Myung Lee, et al,

1. Add two new attributes to table 71 November, 2004 1. Add two new attributes to table 71 Table 71—MAC PIB attributes Attribute Identifier Type Range Description Default macSelfPostBeaconDelay 0xXX Integer 0x0000-0xffff The number of symbols a coordinator needs to wait for the starting of its own CAP after it sends out a beacon. macParentPostBeaconDelay The number of symbols a device needs to wait for the starting of its parent’s CAP after it receives a beacon from its parent. Myung Lee, et al,

2. Add a new subfield to the superframe specification field November, 2004 2. Add a new subfield to the superframe specification field Bits: 0-3 4-7 8-11 12 13 14 15 16-31 Beacon Order Superframe order Final CAP slot Battery life extension reserved PAN coordinator Association Permit postBeaconDelay Figure 40—Format of the superframe specification field Assumption: 15.4b devices can recognize the new “postBeaconDelay” subfield with the knowledge of version number. Myung Lee, et al,

3. Change text in the fourth paragraph of 7.5.1.1 November, 2004 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. Myung Lee, et al,

4. Change text in the first paragraph of 7.5.1.1.1 November, 2004 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 parent’s CAP macParentPostBeaconDelay symbols after it receives the beacon from its parent. Myung Lee, et al,

5. Change text in the ninth paragraph of 7.5.1.3 November, 2004 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. Myung Lee, et al,