the average transmission rate experi- enced by a large number of users geographically dispersed throughout an area served by a base station, and the minimum transmission rate before a user is cut off. The peak transmission rate is of interest to a mobile network operator as it is useful for marketing purposes. It is calculated based on the best or the highest AMC scheme and is avail- able to those users located 'very close' to a base station, that is where the SINR is very high. At these locations, maximum transmission rates may be supported. The average transmission rate is the average rate experienced by a user travelling through a cell area. When the user is 'close' to a base station with high SINR, its mobile device can expe- rience high transmission rates. When a user is 'far' from a base station, its mobile device will experience a lower transmission rate. The average transmission rate for a user is calculated by averaging the possible transmission rates over a geographic area covered by a base station. The minimum transmission rate is the rate at which a base station cuts off transmission to a mobile device. While theoretically (according to Shannon's theorem) transmission may be possible at very low rates, a mobile network operator stops transmitting to a mobile device to avoid situations of very low transmission rates and poor transmission quality. The minimum transmission rate is decided by a mobile network operator. W-CDMA Release 6 - Introduction of HSUPA Release 6 of the W-CDMA standard, which was first published in 2005, introduced High Speed Uplink Packet Access (HSUPA). HSUPA enables a mobile device located 'close' to a base station, that is where SINR is high, to transmit at high rates in the uplink. Until Release 6 of the W-CDMA standard, uplink transmission speeds had remained the same since Release 99. Introduction of HSUPA meant that it became practical for mobile devices to, for example, Terrestrial Broadband Wireless Telecommunications Table 10.5 Transmission rates for different releases of