A TDMA protocol design to relay voice communications

There are many applications in wireless communications. Many devices are used to connect wireless instead of cables. Wireless markets are growing very fast after smartphones have been introduced. Application area of Bluetooth wireless connections are growing and their applied devices are introduced in markets nowadays. But wireless voice communications are implemented using analog communication technology. Therefore digital voice communications are required to communicate voice as well as data over ad-hoc capability. This paper presents a protocol to communicate digital voice data for small groups. The proposed protocol can relay data or voice to other nodes by multi-hop retransmission using TDMA method. To implement TDMA, it is required to divide a network cycle to 17 small time slot. To add ad-hoc capability, the first slot is assigned a contention slot. This slot is used to find any new nodes to join the network. The maximum sixteen nodes can communicate each other by full duplex mode and the number of listen-only node is not limited. The simulation results show that a straight line ad-hoc connection time for 16 nodes is less than 450msec. The proposed network delivers very reliable voice packets since the packet loss is 4.9% at leaf nodes when nodes move randomly at the speed of 6m/sec.