Ad-Hoc Buffering in Neighbor Nodes for Burst Data Transmissions in Wireless Sensor Networks

In sensor networks, burst sensor messages are required to be transmitted along a wireless multihop routes to a sink node with no lost sensor messages and with shorter transmission delay. However, due to congestions, buffers in intermediate sensor nodes around the sink node overflow. In addition, buffers in other intermediate sensor nodes are also overflow since an intermediate node Ni is an exposed node of a next-hop node N_i+1, a previous-hop node N_i-1 is an exposed node of N_i and N_i-2 and N_i+2 are hidden nodes of Ni. Thus, contentions among these nodes cause less transmission opportunities and buffers in Ni may overflow. In order to reduce such buffer overflow, this paper proposes (1) a method for notification of a filled buffer to the previous-hop node and (2) a method for forwarding sensor messages to a pseudo next-hop node N_i+1 which is a neighbor node of N_i and N_i+2 for reduction of lost sensor messages and for shorter transmission delay.