Clock recovery for CBR traffic in wireless ATM networks

In order to support multimedia in the wireless networks, the ATM technology will be adopted. CBR traffic should also be supported, and then the clock recovery for CBR traffic is one of the key techniques in wireless ATM networks. Due to the absence of a common network clock, higher cell delay jitter and higher cell loss in wireless network, the new clock recovery technique should be used to deal with the above cases. We propose a new clock recovery technique named asynchronous residual time stamp (ARTS). The ARTS is similar to SRTS used in B-ISDN/ATM networks, but the reference clock in ARTS is independent of the source and the destination. In addition, the pulse positive/negative stuffing technique is used to improve the performance of ARTS, and an ARTS first-in-first-out (FIFO) buffer is implemented to absorb the ARTS delay jitter at the destination. On the other hand, the difference regularity of the previously received ARTSs is used to estimate and then compensate the loss of the ARTSs. Analysis and simulation results indicate that the proposed clock recovery technique for CBR traffic is adequate for wireless ATM networks, and is compatible with that of B-ISDN/ATM networks.