The IEEE 802 committee's recently concluded plenary session included reports of progress in several areas and continuing disagreement in others.
The 802.11n working group has not achieved consensus on what measures will be required to mitigate interference of the new standard with legacy 802.11a/b/g networks. A key point in the debate is whether or not to allow both 20-MHz and 40-MHz channel operation in the 2.4 GHz band.
802.11 a/b/g networks operate with 20-MHz channels. IEEE 802.11n's advantages come in part by utilizing 40-MHz channels. The problem is that there is only 70 MHz available to b/g services in the bandso overlapping channels is a high probability.
More information on this issue is available at Taming the Beast: 802.11n Coexistence with legacy networks.
In a separate development, the 802.11 (Wi-Fi) and 802.16 (WIMAX) committees are working with the ITU Telecommunication (ITU-T) standards group to integrate their respective technologies into the ITU-T's International Mobile Telecommunications (IMT) Advanced framework.
This work began in January 2007. IEEE 802.16 has been identified as serving as the mobile interface of IMT and 802.11 has been identified as the nomadic interface.
Another IEEE response to the ITU requirements has been to create an 802.16m task group. Both initiatives are at an early stage and have a long way to go before becoming a standard.
802.11m is working on a standard with data rates of 100 Mbit/s for mobile applications and 1 Gbit/s for fixed applications, cellular, macro and micro cell coverage.