Method and apparatus for scheduling and modulation and coding selection for supporting quality of service in transmissions on forward shared radio channels
View Patent ↗The invention is a process and system for controlling selection of which MS is to receive the next packet data transmission on a forward channel and selection of which plural MCS is to be used for the packet data transmissions on the forward channel. A process for controlling selection of MCS method to be used by a BTS ( 10 ) to transmit data packets over a forward shared channel to a MS ( 12 ) in accordance with the invention stores information at the BTS, the information containing MCS methods which may be selected to transmit data packets over the forward shared channel to the MS; receiving from the MS at the BTS a quality indication of transmission of data packets over the forward channel to the MS; and selecting a MCS method from a plurality of MCS methods which may be used to transmit data packets on the forward channel dependent upon the received quality indication.
1. A method comprising:
receiving at a base station transceiver information from each of a plurality of mobile stations derived by each mobile station from data packets transmitted on a forward shared channel to each of the plurality of mobile stations which is a function of at least two of a plurality of parameters, the parameters being throughput of the data packets, frame error rate of the data packets, delay of the data packets and subscriber priority, the received information being sent to the base station transceiver autonomously by each of the plurality of mobile stations without the mobile stations being polled for the information by the base station transceiver; and
scheduling a next transmission of data packets to one of the plurality of mobile stations based upon calculating a scheduling quantity for each of the plurality of mobile stations which is a function of at least two of the plurality of the parameters which satisfies a scheduling criteria to determine which mobile station is allocated the next transmission of data packets,
wherein the scheduling quantity is a function of a ratio R(req)/R(avg),
where R(req) is the required throughput of the data packets and R(avg) is the average throughput of the data packets,
a function of a ratio FER(avg)/FER(req) where FER(avg) is the average frame error rate of the data packets and FER is the required frame error rate of the data packets,
a function of a ratio DELAY(avg)/DELAY(req) where DELAY(avg) is the average transmission delay between transmission of the data packets and DELAY(req) is the maximum permissible transmission delay of the data packets and the subscriber priority is a saved subscriber priority of a priority of data transmission between subscribers of the mobile stations.
2. A method in accordance with claim 1 , wherein the next transmission is assigned to a mobile station which qualifies under the scheduling criteria by performing a comparison of all calculated scheduling quantities for the mobile stations.
3. A method in accordance with claim 2 , wherein the scheduling quantity is a function of all of the parameters.
4. A method in accordance with claim 1 , wherein the scheduling quantity is a function of all of the parameters.
5. A method in accordance with claim 3 , wherein the scheduling quantity is SCHDL(i) and
SCHDL( i )=( k 1 *R (req)/ R (avg)+ k 2*
FER(avg)/FER(req)+ k 3*DELAY(avg)/DELAY(req))*pri
where ki, k2 and k3 are normalization factors which are configurable at the base transceiver station and pri is a requested priority subscription priority.
6. A method in accordance with claim 2 , wherein the scheduling quantity is SCHDL(i) and
SCHDL( i )=( k 1 *R (req)/ R (avg)+ k 2*
FER(avg)/FER(req)+ k 3*DELAY(avg)/DELAY(req))*pri
where ki, k2 and k3 are normalization factors which are configurable at the base transceiver station and pri is a requested priority subscription priority.
7. A method in accordance with claim 4 , wherein the scheduling quantity is SCHDL(i) and
SCHDL( i )=( M*R (req)/ R (avg)+ k 2*
FER(avg)/FER(req)+ k 3*DELAY(avg)/DELAY(req))*pri
where ki, k2 and k3 are normalization factors which are configurable at the base transceiver station and pri is a requested priority subscription priority.
8. A method in accordance with claim 1 , wherein the scheduling quantity is SCHDL(i) and
SCHDL( i )=( k 1*R(req)/ R (avg)+ k 2*
FER(avg)/FER(req)+ k 3*DELAY(avg)/DELAY(req))*pri
where ki, k2 and k3 are normalization factors which are configurable at the base transceiver station and pri is a requested priority subscription priority.
9. A method in accordance with claim 1 , wherein the received information is a function of delay of the data packets, the delay of the data packets being end to end delay.
10. A method comprising:
receiving at a base station transceiver information from each of a plurality of mobile stations derived by each mobile station from data packets transmitted on a forward shared channel to each of the plurality of mobile stations which is a function of at least two of a plurality of parameters, the parameters being throughput of the data packets, frame error rate of the data packets, delay of the data packets and subscriber priority, the received information being sent to the base station transceiver autonomously by each of the plurality of mobile stations without the mobile stations being polled for the information by the base station transceiver; and
scheduling a next transmission of data packets to one of the plurality of mobile stations based upon calculating a scheduling quantity for each of the plurality of mobile stations which is a function of at least two of the plurality of the parameters which satisfies a scheduling criteria to determine which mobile station is allocated the next transmission of data packets,
wherein the scheduling quantity is SCHDL(i) and
SCHDL( i )=( M*R (req)/ R (avg)+ k 2*
FER(avg)/FER(req)+ k 3*DELAY(avg)/DELAY(req))*pri
where ki, k2 and k3 are normalization factors which are configurable at the base transceiver station and pri is a requested priority subscription priority.
11. An apparatus comprising at least one processor, the at least one processor configured to cause the apparatus to at least:
receive information from each of a plurality of mobile stations derived by each mobile station from data packets transmitted on a forward shared channel to each of the plurality of mobile stations which is a function of at least two of a plurality of parameters, the parameters being throughput of the data packets, frame error rate of the data packets, delay of the data packets and subscriber priority, the received information being sent to the apparatus autonomously by each of the plurality of mobile stations without the mobile stations being polled for the information by the apparatus; and
schedule a next transmission of data packets to one of the plurality of mobile stations based upon calculating a scheduling quantity for each of the plurality of mobile stations which is a function of at least two of the plurality of the parameters which satisfies a scheduling criteria to determine which mobile station is allocated the next transmission of data packets,
wherein the scheduling quantity is a function of R(req) and R(avg),
wherein R(req) is the required throughput of the data packets and R(avg) is the average throughput of the data packets,
a function of a ratio FER(avg)/FER(req) where FER(avg) is the average frame error rate of the data packets and FER is the required frame error rate of the data packets, a function of a ratio DELAY(avg)/DELAY(req) where DELAY(avg) is the average transmission delay between transmission of the data packets and DELAY(req) is the maximum permissible transmission delay of the data packets and the subscriber priority is a saved subscriber priority of a priority of data transmission between subscribers of the mobile stations.
12. An apparatus in accordance with claim 11 , wherein the next transmission is assigned to a mobile station which qualifies under the scheduling criteria by performing a comparison of all calculated scheduling quantities for the mobile stations.
13. An apparatus in accordance with claim 11 , wherein the scheduling quantity is a function of all of the parameters.