Thursday 19 December 2013

What is WAVE, 802.11p ?


1) Wireless access in vehicular environments (WAVE)

2) Added support in 802.11 for Intelligent Transportation Systems (ITS) applications.

3) Applicable ITS band 5.9 GHz (5.85-5.925 GHz).

4) IEEE 1609 is a higher layer standard based on the IEEE 802.11p.

5) There is no association and authentication procedure before exchange of data.

6) Use of wildcard BSSID ( a value of all 1s) in the header of all frames they exchange, and may start communication as soon as they arrive on same communication channel.

7) Addition of new management frame for timing advertisement, which allows IEEE 802.11p enabled stations to synchronize themselves with a common time reference. The only time reference defined in the IEEE 802.11p amendment is UTC or Coordinated Universal Time.

8) Channel rejection requirements can be implemented  (for both adjacent and nonadjacent channels) to avoid out-of-channel interferences. They only apply to OFDM transmissions in the 5GHz band used by the IEEE 802.11a physical layer.

9) Frequecy band : 5.9GHz band (5.850-5.925 GHz) with 5MHz, 10MHz and 20MHz channel spacings, countries: United States , Europe

Ref: Wiki, 802.11p standard