Patent ID: 7916650

Claim:
A data transmission method for a wireless sensor network including a network coordinator and a plurality of network devices, comprising: assessing channel availability after initializing, when a packet to be transmitted is generated, with regard to a number of carrier sensing attempts and a backoff value; determining, when the channel availability is assessed to be idle, whether or not the backoff value reaches 0; transmitting the packet if the backoff value reaches 0; and reassessing, if the backoff value does not reach 0, the channel after a duration corresponding to a time slot which equals to W/(Ns-1); wherein determining whether the backoff value reaches 0 comprises setting, when the channel availability is determined to be busy, a backoff period equal to L/2 bit time being a fraction of L and reassessing the channel, wherein L comprises a length of the packet, and wherein the value of the backoff value is set to an integer value selected in the range of 0 to 2 BE -1 where BE comprises a backoff exponent.