Performance Analysis of Beacon enabled Prioritized CSMA/CA for IEEE Sensor Networks

The delay sensitive application experiences the problem of meeting the deadline without collision in the low rate wireless sensor network. In sensor networks, every application does not require high packet delivery ratio or high throughput rather it demands the accuracy in delivering the small amount of data. Thus this paper presents the priority-based approach for delay sensitive applications over the delay tolerant applications in the heterogeneous wireless sensor networks. The slotted standard CSMA/CA beacon enabled MAC protocol does not address the prioritization of information but guarantees the delivery of data collision-free; therefore, the slotted protocol considered and modified from the priority perspective. The priority type, namely high and no is assigned to every source node and based on this information the base station allocates the GTS slot in CFP window whereas other nodes contend for the channel access randomly according to their backoff timer CAP window. This approach improves the data delivery faster in the multihop network topology. The presented work is simulated in ns2 and examined using various scenarios over different simulation times. The analysis shows that slotted CSMA/CA with priority approach takes less delay and produces significant goodput.