Patent ID: 7693485
Filing Date: 2010-04-06
Classification: H04W,Y02D

Abstract:
1. A master wireless unit arranged to communicate with a slave wireless unit by sending packets, and having a controller configured to arrange to address the slave to enable the slave to resynchronize to the master by transmitting packets in a polling mode in which packets are addressed to the slave individually rather than broadcast and in which the packets are transmitted at intervals sufficient to maintain synchronization to the slave, the packets transmitted in the polling mode including first packets of a type which prompt a response from the slave, the first packets transmitted at a rate to maintain a connection to the slave, and in each interval between successive first packets, the packets transmitted in the polling mode further including several second packets of a type which need no response by the slave, to maintain synchronization of the slave, wherein the first packets and the second packets are transmitted in the polling mode in a repeating sequence.