ng 11 Mbps using DSSS and CCK on the 2.4 GHz ISM band. 802.11d Enables MAC level configuration of allowed frequencies, power levels and signal bandwidth to comply with local RF regulations, thereby facilitating international roaming. 802.11e Addresses quality of service (QoS) requirements for all 802.11 radio interfaces, providing TDMA to prioritise and error-correction to enhance performance of delay sensitive applications. 802.11f Defines recommended practices and an Inter-Access Point Protocol to enable access points to exchange the information required to support distribution system services. Ensures inter-operability of access points from multiple vendors, for example to support roaming. 802.11g Enhances data rate to 54 Mbps using OFDM modulation on the 2.4 GHz ISM band. Interoperable in the same network with 802.11b equipment. 802.11h Spectrum management in the 5 GHz band, using dynamic frequency selection (DFS) and transmit power control (TPC) to meet European requirements to minimise interference with military radar and satellite communications. 802.11i Addresses the security weaknesses in user authentication and encryption protocols. The standard employs advanced encryption standard (AES) and 802.1x authentication. 802.11j Japanese regulatory extension to 802.11a adding RF channels between 4.9 and 5.0 GHz. 802.11k Specifies network performance optimisation through channel selection, roaming and TPC. Overall network throughput is maximised by efficiently loading all access points in a network, including those with weaker signal strength. 802.11n Provides higher data rates of 150, 350 and up to 600 Mbps using MIMO radio technology, wider RF channels and protocol stack improvements, while maintaining backward compatibility with 802.11 a, b and g. 802.11p Wireless access for the vehicular environment (WAVE), providing commu- nication between vehicles or from a vehicle to a roadside access point using the licensed intelligent transportation systems (ITS) band at 5.9 GHz. Wireless LAN Standards Table 6-1: The 