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

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

3. Background Subgroup established in Singapore (Sept. 2003)
Mandate: establish a channel model for system evaluation of a a 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

4. 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, ….)

5. Generic model structure
Why not reuse a?: (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

6. 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)

7. Future workplan
Finalization of generic model structure: end of Feb. 2004
Measurement campaigns to establish parameters: Dec April 2004
Parameter extraction: March-May 2004
Presentation of model (2004)
Writing of MATLAB program for general use (optional) May-June 2004

8. 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!