Adaptive Reservation MAC Protocol for Voice Traffic in Wireless Ad-Hoc Networks

Due to the On/Off nature of voice traffic, resource reservation for voice traffic in ad-hoc network is a very challenging task. On one hand, allocating resource to voice sources for all the duration of the connection results in bandwidth wasting because of the Off periods. On the other hand, releasing resources during the Off periods and reallocating them during active periods causes large and variable access delay and increases jitter. In this paper we propose an adaptive reservation protocol for voice/data support. The proposed scheme allocates slots to voice sources each time they wake up, and gives them high priority to send their reservation requests over data sources. The bandwidth unused by idle voice sources is rendered temporarily available for reservation. Simulation results show that the proposed scheme improves the performances of voice traffic in terms of dropping rate.