Load-aware handoff and site selection scheme
The present invention is directed to a distributed approach to handoff and cell site selection that takes into account the load dynamics in a multi-cell system.
1. A method for cell site selection in a shared channel multi-cell wireless communication network, the method comprising:
receiving load information from each of a plurality of candidate base stations;
estimating throughput of the shared channel for each candidate base station using the load information received from each of the plurality of candidate base stations;
selecting a candidate base station from the plurality of candidate base stations with a highest throughput for the shared channel as a serving base station;
wherein the load information comprises a number of mobile stations served by the candidate base station in the shared channel multi-cell wireless communication network and the throughput is estimated by dividing the shared channel rate of the candidate base station by the number of mobile stations served by the candidate base station; wherein
if the candidate base station rejects selection as the serving base station, another candidate base station with a next highest throughout is selected as the serving base station.
2. The method of claim 1 wherein the load information is received in a periodic broadcast from the candidate base stations.
3. A method for handoff in a shared channel multi-cell wireless communication network, the method comprising:
measuring the throughput of the shared channel from a current serving base station;
receiving load information from at least one candidate base station;
estimating throughput of the shared channel for the candidate base station using the load information received from the candidate base station; and
if the candidate base station has a higher throughput for the shared channel than the current serving base station, then signaling for a handoff selecting the candidate base station as a new serving base station;
wherein the load information comprises a number of mobile stations served by the candidate base station in the shared channel multi-cell wireless communication network and the throughput is estimated by dividing the shared channel rate of the candidate base station by the number of mobile stations served by the base station; wherein
if the candidate base station rejects selection as the new serving base station, another candidate base station with a next highest throughout which is higher than the current serving base station is selected as the new serving base station.
4. The method of claim 1 further comprising the step of staying with the current serving base station if the candidate base station cannot accept the handoff.
5. The method of claim 1 wherein the load information is received in a periodic broadcast from the candidate base station.