1. doc.IEEE802.15-04-0647-00-4b Submission Nov 2004 Liang Li, WXZJ Inc. Slide 1 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [A Multi-Superframe Proposal Supporting for IEEE 802.15.4b] Date Submitted: [Nov 2004] Source: [Xin Wang, Chenyang Yang, Liang Li, Zhijian Hu ] Company: [WXZJ Inc.] Address: [Building D, No.2, Shangdi XinXi Lu, Beijing, China 100085 ] Voice:[], E-Mail:[liang_1@yahoo.com] Re: [ IEEE 802.15.4 ] Abstract:[This contribution proposes an enhanced MAC for TG4.] Purpose:[ ] 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.

2. doc.IEEE802.15-04-0647-00-4b Submission Nov 2004 Liang Li, WXZJ Inc. Slide 2 The Problems of Current Superframe (1) If the nodes in network have the different properties, the current superframe structure can’t make them all run under the optimized parameters. –Support a node require the transmission delay does not great than 200ms. The BO must set to the value that less than 4. If other nodes need the big BO, the network can not meet this requirement.

3. doc.IEEE802.15-04-0647-00-4b Submission Nov 2004 Liang Li, WXZJ Inc. Slide 3 The Problems of Current Superframe (2) Can not support cluster tree networks well. –The beacons may conflict with each other in cluster tree networks. –The beacon and the data packets from other cluster may also conflict. –The cluster headers may interfere with each other.

4. doc.IEEE802.15-04-0647-00-4b Submission Nov 2004 Liang Li, WXZJ Inc. Slide 4 Our Goals More flexible to support multi-type nodes run in one network. Support the priority and can allocate the channel to some special services such as real-time voice. Support cluster-tree network. Compatibility.

5. doc.IEEE802.15-04-0647-00-4b Submission Nov 2004 Liang Li, WXZJ Inc. Slide 5 Our Proposal: Multi-Superframe Solution

6. doc.IEEE802.15-04-0647-00-4b Submission Nov 2004 Liang Li, WXZJ Inc. Slide 6 Multi-Superframes (1) It’s not necessary that the coordinator sleeps during inactive period, because it usually has strong computing capacity and sufficient power supply. At the begin of the inactive period, the coordinator can allocate a new superframe with different parameters.

7. doc.IEEE802.15-04-0647-00-4b Submission Nov 2004 Liang Li, WXZJ Inc. Slide 7 Multi-Superframes (2) An example: –Two superframes handled by one coordinator. –The active periods of the two superframes are interleaved with each other.

8. doc.IEEE802.15-04-0647-00-4b Submission Nov 2004 Liang Li, WXZJ Inc. Slide 8 Multi-Superframes (3) Nodes can synchronize with one or more superframes, even to all the ones. Nodes can select one or more suitable superframes to synchronize and in other times, they can switch to sleep status to save energy. If the nodes handle an emergency service, it can set to active in all superframes so as to reduce the delay of the packet.

9. doc.IEEE802.15-04-0647-00-4b Submission Nov 2004 Liang Li, WXZJ Inc. Slide 9 Multi-Superframe ID (1) We divide the original PAN ID (we call it SPAN ID in our proposal) into two parts: –PAN ID, 12 bits long, for distinguishing the different WPANs handled by different coordinator. –SF ID, 4 bits long, for distinguishing the different superframes handled by same coordinator.

10. doc.IEEE802.15-04-0647-00-4b Submission Nov 2004 Liang Li, WXZJ Inc. Slide 10 Multi-Superframe ID (2) The SPAN ID with SF ID equal to (0000) is Base-PAN ID. Base-PAN ID stands for all the superframes handled by one coordinator. We can use mask to calculate Base-PAN ID.

11. doc.IEEE802.15-04-0647-00-4b Submission Nov 2004 Liang Li, WXZJ Inc. Slide 11 Multi-Superframe ID (3) Compatibility: –The IEEE 802.15.4 nodes will regard the multi- superframes as superframes in different WPANs because they have different IDs. –The number of the PAN ID is reduced but we think a 12 bits PAN ID is enough.

12. doc.IEEE802.15-04-0647-00-4b Submission Nov 2004 Liang Li, WXZJ Inc. Slide 12 The Priority and Real-Time Voice (1) Each node maintains a priority code, which forbidden nodes access some superframes. In this way, coordinator can only allow voice nodes access one of the multi- superframes. It can allocate enough bandwidth to the voice service and control the delay of the packet.

13. doc.IEEE802.15-04-0647-00-4b Submission Nov 2004 Liang Li, WXZJ Inc. Slide 13 The Priority and Real-Time Voice (2) When association, the nodes can send the desired priority codes within the association request command frames. The coordinator can send back the actual priority code to nodes based on the requirement of nodes and the current status.

14. doc.IEEE802.15-04-0647-00-4b Submission Nov 2004 Liang Li, WXZJ Inc. Slide 14 Cluster-Tree Networks (1) The main idea of the multi-superframe can be used to cluster-tree networks. –The cluster headers (CH) can make their superframes interleaved with each others. –When its own superframe is inactive, the CH can be a normal node of its neighbor's cluster. –The nodes can make sync with more than one superframes maintained by different CHs.

15. doc.IEEE802.15-04-0647-00-4b Submission Nov 2004 Liang Li, WXZJ Inc. Slide 15 Cluster-Tree Networks (2) An Example: