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January 2004
Mitsubishi Electric Research Labs Slide 1
doc.: IEEE 802.15-04/0024r0
Submission
Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [Status report of the 802.15.4a channel modeling subgroup]Date Submitted: [8 January, 2004]Source: [Andreas F. Molisch]Company [Mitsubishi Electric]Address [201 Broadway, Cambridge, MA]Voice [617 621 7558]E-Mail: [ [email protected] ]Re: [Contributions on UWB Channel Models]Abstract: [This contribution describes the status of the IEEE 802.15.4a channel modeling subgroup, the currently envisioned generic model structure, and an outlook for future work ]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.
January 2004
Mitsubishi Electric Research Labs Slide 2
doc.: IEEE 802.15-04/0024r0
Submission
Contents
• Background
• Radio Environments
• Generic Model Structure
• Future workplan
• Interaction with SG4a plenary
January 2004
Mitsubishi Electric Research Labs Slide 3
doc.: IEEE 802.15-04/0024r0
Submission
Background• Subgroup established in Singapore (Sept. 2003)• Mandate: establish a channel model for system evaluation of a
802.15.4a standard• Timeline: finish by May 2004• Considered bandwidth: 2-10 GHz
– Model has to work for UWB as well as non-UWB proposals that fulfill the CFA requirements
– UWB will be among the proposals– Any UWB model can be downfiltered to a narrowband system– 2.45 GHz ISM band should be included in the considered range
• Working mode: biweekly teleconferences• Very informal approach (within the rules of IEEE): participants always
welcome
January 2004
Mitsubishi Electric Research Labs Slide 4
doc.: IEEE 802.15-04/0024r0
Submission
Radio Environments• Follow from CFA (Nov. 2003, Albuquerque)• List of 10 radio environments established by subgroup:
– 1. Indoor office– 2. Indoor residential– 3. Indoor industrial– 4. Indoor open spaces– 5. Warehouses– 6. Body-worn devices– 7. Out door hand held peer to peer device– 8. Hand held communicating to fixed location devices– 9. Agricultural areas/farms– 10. Sport stadiums– 11. Disaster areas (houses filled with rubble, avalanches, ….)
January 2004
Mitsubishi Electric Research Labs Slide 5
doc.: IEEE 802.15-04/0024r0
Submission
Generic model structure• Why not reuse 802.15.3a?: (i) operating environments are different, (ii)
longer range, (iii) more measurements are now available in the literature
• First step: time-continuous model that is valid within the considered bandwidth
• Explicit discretization rules will follow later, together with a possible MATLAB implementation
• Basic structure (tentative, status Jan. 8th):– Saleh-Valenzuela model: multiple clusters, with discrete multipaths
in each of them, plus a diffuse component– Number of clusters is assumed fixed (no random variable)– Movement not modeled explicitly, but rather via angular spectrum.
That allows separation of effects due to movement of MS and movement of scatterers
January 2004
Mitsubishi Electric Research Labs Slide 6
doc.: IEEE 802.15-04/0024r0
Submission
Generic model structure (contd.)
• Parameterization of– Pathloss and shadowing (including frequency
dependence)– Arrival rates of multipath components (delay
dependent?)– Average power delay profiles (per-cluster delay
spreads)– Average angular spectra (including dependence on
delay)– Small-scale fading statistics (Rayleigh, lognormal, or
Nakagami)
January 2004
Mitsubishi Electric Research Labs Slide 7
doc.: IEEE 802.15-04/0024r0
Submission
Future workplan
• Finalization of generic model structure: end of Feb. 2004• Measurement campaigns to establish parameters: Dec. 2003-April
2004• Parameter extraction: March-May 2004• Presentation of model (2004)• Writing of MATLAB program for general use (optional) May-June
2004
January 2004
Mitsubishi Electric Research Labs Slide 8
doc.: IEEE 802.15-04/0024r0
Submission
Interaction with SG4a plenary
• Minutes of teleconferences are sent out to SG4a reflector• Status reports at every 4a meeting• We need more input from SG4a!!!
– Without the model, no proper selection of candidate PHY layers can be made
– Any radio environment for which we do not have sufficient data will be eliminated from the list. In that case, the suitability of the PHY layer for a specific application cannot be tested
– At the moment, most work is being done by just a few participants. We need a fair distribution of the workload.
• We have a unique chance to get the channel model, and thus the basis for 4a, to a good start. Let’s not waste that chance!
