1. doc.: IEEE 802.11-09/0323r1 Submission March 2009 Vinko Erceg, BroadcomSlide 1 TGad Channel Model Requirements Date: 2009-03-10 Authors:

2. doc.: IEEE 802.11-09/0323r1 Submission March 2009 Vinko Erceg, BroadcomSlide 2 Outline 802.15.3c Channel Model Description 802.15.3c Channel Model Discussion Propagation Environments of Interest Proposed Requirements for TGad Channel Models

3. doc.: IEEE 802.11-09/0323r1 Submission March 2009 Vinko Erceg, BroadcomSlide 3 802.15.3c Channel Model Description (1) The statistical channel models [1] developed by the IEEE 802.15.3c group included the following features: –LOS and NLOS components –Based on the generalized Saleh-Valenzuela channel model with clustering in both the time and angular domains –Cluster arrivals and intra-cluster ray arrivals are modeled with two Poisson random processes. –Cluster amplitudes and intra-cluster ray amplitudes are modeled with log-normal random processes. –The cluster angle-of-arrival (AoA) has a uniform probability density. The AoAs of different clusters are independent. –The individual AoA of each ray within each cluster has either Gaussian or Laplacian density.

4. doc.: IEEE 802.11-09/0323r1 Submission March 2009 Vinko Erceg, BroadcomSlide 4 802.15.3c Channel Model Description (2) Channel ModelScenarioEnvironmentDescriptions CM1LOSResidentialTypical home with multiple rooms and furnished with furniture, TV sets lounges, etc. The size is comparable to the small office room. The walls/floor are made of concrete or wood covered by wallpaper/carpet. There are also windows and wooden door in different rooms within the residential environment. CM2 NLOS CM3LOSOfficeTypical office setup furnished with multiple chairs, desks, computers and work stations. Bookshelves, cupboards and whiteboards are also interspersed within the environment. The walls are made by metal or concrete covered by plasterboard or carpet with windows and door on at least one side of the office. Cubical, laboratory, open and closed office can be treated as a generic office. Typically these offices are linked by long corridors. CM4 NLOS CM5LOSLibraryTypical small size library with multiple desks, chairs and metal bookshelves. Bookshelves are filled with books, magazines, etc. Some tables and chairs were interspersed between the bookshelves. At least one side of room has windows and/or door. The walls are made of concrete. CM6 NLOS CM7LOSDesktopTypical office desktop and computer clutter. Partitioning surrounded this environment CM8NLOS CM9LOSKioskTypical kiosk server with human body holding a portable device. The portable device is pointed to the kiosk server.

5. doc.: IEEE 802.11-09/0323r1 Submission March 2009 Vinko Erceg, BroadcomSlide 5 802.15.3c Channel Model Discussion (1) We believe the general approach used to create the channel models, based on the extended time-angular S-V model, is valid. Some of results obtained by the IEEE 802.15.3c channel modeling group may be reused in the 60 GHz TGad channel model. However, the reuse of the IEEE 802.15.3c channel modeling results is complicated by the fact that no raw channel measurement data, except for the IMST company data used to generate the library model, are available [2].

6. doc.: IEEE 802.11-09/0323r1 Submission March 2009 Vinko Erceg, BroadcomSlide 6 802.15.3c Channel Model Discussion (2) 802.15.3c channel model provides limited support for evaluating beamforming performance: –Angle-of-Departure (AoD) is not included in the.15.3c channel models and the AoA model only describes the azimuth angle (no elevation information) There is no support for polarization characteristics: –As was shown in [3], the degradation due to polarization mismatch can be as high as 20 dB There is no support for non-stationary, human body blockage effects which can have a strong impact on 60 GHz devices

7. doc.: IEEE 802.11-09/0323r1 Submission March 2009 Vinko Erceg, BroadcomSlide 7 802.15.3c Channel Model Discussion (3) Due to differences in the approaches to statistical channel modeling, 802.15.3c decided to prepare golden data sets (instead of Matlab code) for the channel realizations that were used in proposal evaluation. The golden sets were prepared for only a subset of the channel models (CM1, CM2 and CM3) that included some “extraordinary” realizations that produced a BER “floor” for some channels [4, 5].

8. doc.: IEEE 802.11-09/0323r1 Submission March 2009 Vinko Erceg, BroadcomSlide 8 Propagation Environments of Interest for TGad Three environments are considered in accordance with the evaluation methodology proposal [6]: –Residential living room –Conference room –Cubicle environment Adding more environments may unnecessarily complicate the channel model development: –Most of the TGad usage models [7] can be related to the above three environments –Measurements may not be available for other environments

9. doc.: IEEE 802.11-09/0323r1 Submission March 2009 Vinko Erceg, BroadcomSlide 9 Proposed Requirements for TGad Channel Models Adopt the general structure of the 802.15.3c models and add the following features: –Support for steerable directional antennas at both the TX and RX sides (i.e. both AoA and AoD distributions) –Polarization characteristics of antennas and signals –Non-stationary/human body blockage effects Consider three propagation environments: –Residential living room –Conference room –Cubicle environment

10. doc.: IEEE 802.11-09/0323r1 Submission March 2009 Vinko Erceg, BroadcomSlide 10 References [1] Su-Khiong Yong “TG3c Channel Modeling Sub-committee final report,” IEEE doc. 15-07-0584r1. [2] A. Maltsev et al. “Channel Modeling for 60 GHz WLAN Systems,” IEEE doc. 11-08-811r1. [3] A. Maltsev et al. “Channel Modeling for 60 GHz WLAN Systems,” Intel Workshop on mmWave Networking: Applications, Advances and Challenges, October 7, 2008. [4] A. Maltsev, R. Maslennikov, A. Khoryaev “Comments on CM3.1 golden set”, IEEE doc. 15-07-0715-00-003c. [5] A. Bourdoux, S. Derore, J. Nsenga, W. Van Thillo, “PHY Layer Submission for 802.15.3c”, IEEE 802.15-0691-01-003c. [6] Eldad Perahia “TGad Evaluation Methodology,” IEEE doc. 11-09- 0096r0. [7] Andrew Myles and Rolf de Vegt “Liaison from Wi-Fi Alliance to 802.11 regarding WFA VHT Study Group Consolidation of Usage Models,” IEEE doc. 11-07-2988r4.

11. doc.: IEEE 802.11-09/0323r1 Submission March 2009 Vinko Erceg, BroadcomSlide 11 Straw Poll Would you support the TGad channel model requirements outlined on the previous slide? Yes 60/No 0/Abs 2