An enhanced reservation dynamic slot allocation multiple access protocol for wireless ATM
Qun Lu, Xuemai Gu, Jia Shi-lou · 2002
An enhanced multiple access scheme is presented for wireless ATM networks. The DSAMA (dynamic slot allocation multiple access), which was proposed by Wu et al. (see ICC97, p.1560-65, 1997), is a combination of reservation multiple access protocol and dynamic slot allocation algorithm. The slot utilization in DSAMA is higher than other existing integrated services multiple access, e.g. PRMA, etc. However, in DSAMA, it uses an orthogonal code for reservation, and the application of this orthogonal code strongly depends on the speed of a special chip, which is used to generate the orthogonal code. It requires the speed of this chip to be equal to the channel rate. Unfortunately, this will limit the application range of this MAC scheme. We present a new reservation method from a more general point of view, which makes the MAC protocol free from the hardware. By using an orthogonal address code and a new RR slot, the collision rate of the W-cell is reduced to a very low level. In addition, due to the limitation of the bandwidth available in the wireless network, we propose a more effective dynamic slot allocation algorithm. With a more exact boundary variable and a new allocation mechanism, we obtain a higher statistical multiplexing gain.