1. doc.: IEEE 802.11-02/308r0 Submission May 2002 Y Inoue, et.al.,NTT Laboratories Slide 1 Next Generation Wireless LANs Yasuhiko Inoue, Tetsu Sakata and Masahiro Morikura NTT mailto:yinoue@ansl.ntt.co.jp

2. doc.: IEEE 802.11-02/308r0 Submission May 2002 Y Inoue, et.al.,NTT Laboratories Slide 2 Agenda 1.Bit Rate 2.Frequency Band 3.Access Control Mechanism

3. doc.: IEEE 802.11-02/308r0 Submission May 2002 Y Inoue, et.al.,NTT Laboratories Slide 3 1. Bit Rate

4. doc.: IEEE 802.11-02/308r0 Submission May 2002 Y Inoue, et.al.,NTT Laboratories Slide 4 Bit Rate How it should be? Scenarios: –Private networks in the office environment 100 Base-TX (with in a LAN segment) GbE or 10G Ethernet (Backbone) –Internet access in the home or SOHO FTTH (100M bit/s) –Home networks AV transmissions Information appliances Interwork with other devices such as IEEE 1394 and USB

5. doc.: IEEE 802.11-02/308r0 Submission May 2002 Y Inoue, et.al.,NTT Laboratories Slide 5 Bit Rate (Cont’d) Constrains: –Available bandwidth –Number of channels Basic Rate of 100M bit/s will be reasonable Some optional rates, e.g.) x2, x4,... Basic Rate of 100M bit/s will be reasonable Some optional rates, e.g.) x2, x4,...

6. doc.: IEEE 802.11-02/308r0 Submission May 2002 Y Inoue, et.al.,NTT Laboratories Slide 6 2. Frequency Band

7. doc.: IEEE 802.11-02/308r0 Submission May 2002 Y Inoue, et.al.,NTT Laboratories Slide 7 Frequency Band OFDM is going to be a common PHY mechanism in 2.4 GHz and 5 GHz bands 200020012002200319992004 2.4 GHz band 5 GHz band 802.11a (OFDM) 802.11g (CCK+OFDM) 802.11b (CCK) TGg is adopting the OFDM technique in 2.4GHz band year

8. doc.: IEEE 802.11-02/308r0 Submission May 2002 Y Inoue, et.al.,NTT Laboratories Slide 8 Frequency Band (Cont’d) 802.11b/g 24002483.55150 5250 5350 802.11a/h [MHz] Number of channels available –2.4GHz; 3 channels for 11b systems –5GHz; 12 channels, U.S. (U-NII lower, middle, upper bands) 19 channels, Europe (5.15-5.25, 5.25-5.35, 5.47-5.725 GHz) 4 channels, Japan (5.15-5.25 GHz) Japan U.S. and Europe

9. doc.: IEEE 802.11-02/308r0 Submission May 2002 Y Inoue, et.al.,NTT Laboratories Slide 9 Frequency Band (Cont’d) Some functions or services requires many channels to avoid interference –Examples: QoS support Public Wireless LAN services –Number of required channels depends on the PHY –2.4GHz and 5GHz bands should be considered as a unified frequency band for the next system Target frequency band should be both 2.4GHz and 5GHz

10. doc.: IEEE 802.11-02/308r0 Submission May 2002 Y Inoue, et.al.,NTT Laboratories Slide 10 Frequency bands and PHY CCK PBCC (option) CCK-OFDM (option) PBCC (option) OFDM 802.11b 802.11g 802.11a OFDM 2.4GHz 5GHz New PHY ???

11. doc.: IEEE 802.11-02/308r0 Submission May 2002 Y Inoue, et.al.,NTT Laboratories Slide 11 3. Access Control Mechanism

12. doc.: IEEE 802.11-02/308r0 Submission May 2002 Y Inoue, et.al.,NTT Laboratories Slide 12 Access Control Mechanism IEEE 802.11 MAC –DCF and PCF (original) –QoS support (TGe) –Security Enhancements (TGi) Requirements for the new MAC protocol –Improved spectrum efficiency –Interoperability with legacy devices How should we develop a new MAC protocol?

13. doc.: IEEE 802.11-02/308r0 Submission May 2002 Y Inoue, et.al.,NTT Laboratories Slide 13 New MAC Protocol #1 Extend 802.11 original MAC New MAC –Backward compatibility with legacy devices 802.11 Legacy MAC QoS Support Security

14. doc.: IEEE 802.11-02/308r0 Submission May 2002 Y Inoue, et.al.,NTT Laboratories Slide 14 New MAC #2 New MAC protocol coexisting with legacy MAC –Legacy devices are replaced by the new devices gradually –Legacy and new devices can coexist in the transitional period 802.11 Legacy MAC QoS Support Security New MAC Protocol

15. doc.: IEEE 802.11-02/308r0 Submission May 2002 Y Inoue, et.al.,NTT Laboratories Slide 15 New MAC #3 Replace legacy MAC with a new MAC –It may be a chance to replace the MAC completely 802.11 Legacy MAC QoS Support Security New MAC Protocol but, Is it acceptable?

16. doc.: IEEE 802.11-02/308r0 Submission May 2002 Y Inoue, et.al.,NTT Laboratories Slide 16 Summary Bit Rate –Basic rate 100 M bit/s with options Frequency Band –2.4GHz / 5GHz / Both Access Control Mechanism –Improve the efficiency (reduce the overhead) –Backward compatibility will be required