| 摘要 |
A method and system for TDMA synchronization including providing an ad-hoc TDMA mobile communication network, the communication network includes a plurality of mobile units, transmitting an information packet from a mobile unit of the plurality of mobile units to each remaining one of the plurality of mobile units. The method and system further including comparing at each remaining one of the plurality of mobile units the corresponding preamble detection time trx,i with a predetermined time parameter tcorr, and adjusting the corresponding preamble detection time trx,i of each remaining one of the plurality of mobile units accordingly. In addition, a method for logical timeslot synchronization and its enhancement using directed synchronization procedure with a refresh procedure are disclosed if a transmitting mobile unit exits the communication network and reconnects thereto. |
| 主权项 |
1. A method for TDMA synchronization comprising:
providing an ad-hoc TDMA mobile communication network, said communication network comprises a plurality of mobile units; transmitting an information packet from a mobile unit of said plurality of mobile units to each remaining one of said plurality of mobile units, said information packet comprises at least a preamble; receiving said information packet at each remaining one of said plurality of mobile units; measuring at each remaining one of said plurality of mobile units a corresponding preamble detection time trx,i of said information packet;wherein said method further comprising:
comparing at each remaining one of said plurality of mobile units said corresponding preamble detection time trx,i with a predetermined time parameter tcorr, and adjusting said corresponding preamble detection time trx,i of each remaining one of said plurality of mobile units to equal to tcorr, if trx,i is less than tcorr, thereby synchronizing the TDM time slot of each remaining one of said plurality of said mobile units with the TDM slot of said transmitting mobile unit;configuring said each remaining one of said plurality of mobile units to wait for a further information packet without adjusting said corresponding preamble detection time, if trx,i of said each one of said plurality of mobile units equals tcorr;configuring said each remaining one of said plurality of mobile waiting for a further information packet without adjusting said corresponding preamble detection time, if trx,i is greater than tcorr;configuring said information packet to further comprise a mobile unit identification number, MU_ID, a mobile unit synchronization identification number, SYNC_ID and a data payload;identifying a predetermined slot time size Ssize for said information packet;identifying said at least one mobile unit identification number MU_ID in said received communication packet;identifying at each one of said plurality of said mobile units, a time slot number Scorr at which said preamble terminates;identifying a final time slot Sfinal at which detection of said data packet received from said transmitting mobile unit is detected;determining a time slot number Sstart for a commencement of common TDMA logical scheme from each remaining one of said plurality of said mobile units:
Sstart=Ssize*MU_ID+Sfinal−Scorr,thereby frame synchronizing said common TDMA logical scheme from said at least one mobile unit and said each remaining one of said plurality of said mobile units; andconfiguring said method to receive said information packet at different reception times. |
