Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
Doc.IEEE802.15-04-0647-00-4b Submission Nov 2004 Liang Li, WXZJ Inc. Slide 1 Project: IEEE P802.15...
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Transcript of Doc.IEEE802.15-04-0647-00-4b Submission Nov 2004 Liang Li, WXZJ Inc. Slide 1 Project: IEEE P802.15...
Nov 2004
Liang Li, WXZJ Inc.Slide 1
doc.IEEE802.15-04-0647-00-4b
Submission
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: [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:[[email protected]]
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.
Nov 2004
Liang Li, WXZJ Inc.Slide 2
doc.IEEE802.15-04-0647-00-4b
Submission
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.
Nov 2004
Liang Li, WXZJ Inc.Slide 3
doc.IEEE802.15-04-0647-00-4b
Submission
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.
Nov 2004
Liang Li, WXZJ Inc.Slide 4
doc.IEEE802.15-04-0647-00-4b
Submission
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.
Nov 2004
Liang Li, WXZJ Inc.Slide 5
doc.IEEE802.15-04-0647-00-4b
Submission
Our Proposal: Multi-Superframe Solution
Nov 2004
Liang Li, WXZJ Inc.Slide 6
doc.IEEE802.15-04-0647-00-4b
Submission
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.
Nov 2004
Liang Li, WXZJ Inc.Slide 7
doc.IEEE802.15-04-0647-00-4b
Submission
Multi-Superframes (2)
• An example:– Two superframes
handled by one coordinator.
– The active periods of the two superframes are interleaved with each other.
Nov 2004
Liang Li, WXZJ Inc.Slide 8
doc.IEEE802.15-04-0647-00-4b
Submission
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.
Nov 2004
Liang Li, WXZJ Inc.Slide 9
doc.IEEE802.15-04-0647-00-4b
Submission
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.
Nov 2004
Liang Li, WXZJ Inc.Slide 10
doc.IEEE802.15-04-0647-00-4b
Submission
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.
Nov 2004
Liang Li, WXZJ Inc.Slide 11
doc.IEEE802.15-04-0647-00-4b
Submission
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.
Nov 2004
Liang Li, WXZJ Inc.Slide 12
doc.IEEE802.15-04-0647-00-4b
Submission
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.
Nov 2004
Liang Li, WXZJ Inc.Slide 13
doc.IEEE802.15-04-0647-00-4b
Submission
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.
Nov 2004
Liang Li, WXZJ Inc.Slide 14
doc.IEEE802.15-04-0647-00-4b
Submission
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.
Nov 2004
Liang Li, WXZJ Inc.Slide 15
doc.IEEE802.15-04-0647-00-4b
Submission
Cluster-Tree Networks (2)
• An Example: