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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: [Characteristics of channel hopping in distributed channel hopping (DCH) MAC] Date Submitted: [March 11, 2009] Source: [Wun-Cheol Jeong, Chang-Sub Shin, Anseok Lee, Seong-Soon Joo (ETRI)]

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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

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  1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Characteristics of channel hopping in distributed channel hopping (DCH) MAC] Date Submitted: [March 11, 2009] Source: [Wun-Cheol Jeong, Chang-Sub Shin, Anseok Lee, Seong-Soon Joo (ETRI)] Address [] Voice:[+82-42-860-5104], FAX: [], E-Mail:[wjeong@etri.re.kr] Re: [IEEE P802.15.4e] Abstract: [This document provides channel hopping information for distributed channel hopping (DCH) MAC] Purpose: [Discussion in 802.15.4e 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. Wun-Cheol Jeong et al.

  2. Characteristics of channel hopping in distributed channel hopping (DCH) MAC Wun-Cheol Jeong, Chang-Sub Shin, Anseok Lee, Seong-Soon Joo ETRI Wun-Cheol Jeong et al.

  3. EGTS superframe structure • Multi-superframe extension for EGTS • A multi-superframe consists of N superframes. • The allocation pattern is repeated every multi-superframe. • We define MO (multi-superframe order) such that N = 2(MO – SO), where MO ≥ SO. • Multi-superframe Duration MD = aBaseSuperframeDuration*2MO symbols BO = 6, SO = 3, MO = 5 Wun-Cheol Jeong et al.

  4. Dwell time (Td): time spent on any one channel before switching to the next channel Td = aBaseSuperframeDuration * 2SO / 16 = aBaseSlotDuration* aNumSuperframeSlots* 2SO / 16 = 60 * 2SO (symbol) For 2.4 GHz : 960 us * 2SO= 7.68 ms (SO=3) DCH characterization Wun-Cheol Jeong et al.

  5. Hopping sequence length (LHS): number of channel hops before the sequence repeats Max (LHS) = number of channels (for orthogonal seq.) = 27 (per channel page) = 81 (for 15.4 PHY) DCH characterization Wun-Cheol Jeong et al.

  6. chan_num(offset): channel assignment at a given offset C = (c1, c2, …, cLHS) chan_num(offset) = C(offset) chan_num(TimeslotIndex) = C((BeaconIndex * 7 + TimeslotIndex)% LHS) DCH characterization Wun-Cheol Jeong et al.

  7. chan_num(TimeslotIndex) = C((BeaconIndex * 7 + TimeslotIndex) % LHS) DCH characterization Illustration of channel hopping Wun-Cheol Jeong et al.

  8. hop_seq_phase: current place in hop_sequence hop_seq_phase = (BeaconIndex*7+TimeslotIndex)%LHS DCH characterization Wun-Cheol Jeong et al.

  9. time_to_next_hop at ‘t’ If t < aBaseSlotDuration * 9 (=TCAP), time_to_next_hop = TCAP– t If t > TCAP , time_to_next_hop = (t -TCAP) % Td DCH characterization Wun-Cheol Jeong et al.

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