Status report of the channel modeling subgroup of IEEE 802.15.4a Andy Molisch

Contents Background Radio Environments Generic Model Structure Future workplan Interaction with SG4a plenary

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

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, ….)

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

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)

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

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!