In order to improve transmission quality of WSNs

improvements are made on implicit hop-by-hop congestion control protocol in Ad Hoc networks.The protocol can be suitable for WSNs by cooperation of routing layer

MAC layer

and transmission layer.In routing layer

static routing protocol is used

thus flooding can be avoided by setting two destination receiving nodes.Relative information entropy theory is introduced into the transmission layer to achieve implicit confirmation

to increases reliability of data transmission.In the MAC layer

the back-off time which used in the channel competition is determined depend on the distance between the node and the congestion zone.Cross-layer design solves the problem of transmission control in WSNs effectively.Matlab simulation proves that compared with current transmission layer protocols

the improved protocol can increase throughput of the network

reduce the network load

delay and packets loss rate.