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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Dynamic Channel Sele

Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Dynamic Channel Selection] Date Submitted: [10 May, 2006] Source: [Yongjun Liu, Na Shan] Company [Huawei Technologies Co., Ltd]

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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Dynamic Channel Sele

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  1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Dynamic Channel Selection] Date Submitted: [10 May, 2006] Source: [Yongjun Liu, Na Shan] Company [Huawei Technologies Co., Ltd] Address [No.3 Xinxi Road, Shangdi Information Industry Base, Haidian District, Beijing, P.R.China] Voice:[+86 10 82882921], FAX: [+86 10 82882966], E-Mail:[yongjunliu@huawei.com][shanna@huawei.com] Abstract: [This document discuss a dynamic channel selection mechanism for the Mesh Network.] Purpose: [Final Proposal for the IEEE802.15.5 Standard.] 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. Yongjun Liu,Na Shan, Huawei

  2. Dynamic Channel Selection Yongjun Liu Na Shan Huawei Technologies Co., Ltd. Yongjun Liu,Na Shan, Huawei

  3. Contents • Necessity of dynamic channel selection • Overview of the present mechanism • Issues of present mechanism • Propose a new mechanism • Conclusion Yongjun Liu,Na Shan, Huawei

  4. Necessity of dynamic channel selection WLAN PAN 2 PAN 1 Yongjun Liu,Na Shan, Huawei

  5. Necessity of dynamic channel selection (cont.) Yongjun Liu,Na Shan, Huawei

  6. Necessity of dynamic channel selection (cont.) • Congested ISM bands: Wi-Fi/802.11b, Bluetooth/802.15.1, ZigBee/802.15.4, 802.15.3,RFID… • Mechanisms should help to mitigate co-existence interference • Improve reliability Yongjun Liu,Na Shan, Huawei

  7. Present mechanism • 802.15.3: • PNC should periodically listen in the current channel to detect interference or request other nodes to do so • PNC makes analysis of detection results and decides whether to switch to a new channel • 802.15.4: none. Yongjun Liu,Na Shan, Huawei

  8. Issues of present mechanism • The PNC listening range is limited (one hop) • PNC can not detect the interference outside its vicinity • PNC doesn’t know which nodes it should inquire of the channel status • PNC doesn’t know when to inquire the channel status • Some nodes are unable to hear the information about channel switching; the process isn’t defined in the present standard Yongjun Liu,Na Shan, Huawei

  9. Propose a new mechanism -outline • Nodes decide to detect by themselves • PNC (and coordinators) makes analysis of the interference and decisions • PNC notifies all nodes to change channel • Residual nodes rejoin the PAN by successive more steps Yongjun Liu,Na Shan, Huawei

  10. Propose a new mechanism -flow chart Yongjun Liu,Na Shan, Huawei

  11. Propose a new mechanism -interference detection • Nodes decide to do interference detection by themselves • Triggered by instances: too many re-transmissions, high packet loss rate… • Detect periodically: a proactive action help to change the channel faster (Both an instance and an period are implementation dependent) Yongjun Liu,Na Shan, Huawei

  12. Propose a new mechanism - interference detection (cont) periodical detection periodical detection periodical detection do detection for many re-transmissions periodical detection Yongjun Liu,Na Shan, Huawei

  13. Propose a new mechanism - interference analysis • Detection results shall report to PNC • Intermediate coordinators pre-process interference reports (optional) • Coordinators make analyses and decide whether to report to PNC (optional) • PNC makes analyses and decide whether to change operation channel • Detail actions of PNC out of scope Yongjun Liu,Na Shan, Huawei

  14. Propose a new mechanism - change channel • PNC decides to change channel if it is no more appropriate for operation and another channel is much better than it • Find out PS nodes to be wakened, then waken them: The PNC shall announce the system wake beacon in the Next Wake Beacon field in the PS Status IE with PS Set Index field equal to one in the beacon (optional) • Beacons or specified frames are broadcast to notify all nodes of channel switching • Nodes change channel after receiving the broadcast frames Yongjun Liu,Na Shan, Huawei

  15. Propose a new mechanism - actions of residual nodes • Some nodes is unable to hear the channel switching notification frame because they are sleeping or suffering from severe interference • First scan at the previous channel but cannot find the PAN • Then scan all possible channel one by one to relocate the PAN (hold the previous PANID) Yongjun Liu,Na Shan, Huawei

  16. Propose a new mechanism - actions of residual nodes (cont) may scan more than once and more than one channel may scan more than once and more than one channel Yongjun Liu,Na Shan, Huawei

  17. Propose a new mechanism-some introduced structures (high rate) • A node reports the interference status to PNC by the announce command and primitives (MLME-SCAN) • PNC enforces to switch the channel by beacons • Interference status IE • Channel number list (1 octet, bitmap) • Interference status descriptions list (variable) • Length (1 octet) • IE identifier Yongjun Liu,Na Shan, Huawei

  18. MSC for HR new mechanism Yongjun Liu,Na Shan, Huawei

  19. Propose a new mechanism-some introduced structures (low rate) • Interference report: Src addr – addr of detection node, Dest addr – addr of PNC, payload – interference detection results • Channel switching notification: Src addr – addr of PNC, Dest addr – broadcast addr. May reuse coordinator realignment command frame of 15.4b Yongjun Liu,Na Shan, Huawei

  20. Propose a new mechanism-some introduced commands (low rate) Yongjun Liu,Na Shan, Huawei

  21. Propose a new mechanism-some introduced primitives (low rate) Yongjun Liu,Na Shan, Huawei

  22. MSC for LR new mechanism Yongjun Liu,Na Shan, Huawei

  23. Conclusions • Necessity of dynamic channel selection • Overview of current mechanism -some issues not resolved -lack mechanisms for low-rate mesh networks • Proposed a new mechanism for dynamic channel selection -Nodes do detection by time or when they are in difficulty of communicating with other nodes -PNC/Coordinators makes interference analysis, then PNC decides whether to change channel -PNC wakens some PS nodes (optional) -PNC broadcasts a frame to notify all nodes to change channel -Residual nodes may scan more than once to relocate the PAN -Some new frames should be introduced Yongjun Liu,Na Shan, Huawei

  24. Problems??? Yongjun Liu,Na Shan, Huawei

  25. Thank you for your attention! Yongjun Liu,Na Shan, Huawei

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