System and method for dynamic hybrid automatic repeat request (HARQ) enable/disable
View Patent ↗A system and method of increasing data throughput in a wireless communications network between a base station (BS) and one or more mobile stations (MS) includes establishing a service flow (SF) and initially enabling a hybrid automated repeat request (HARQ) protocol; determining, at a particular time, the measure of quality of the communications channel; comparing the determined measure of quality with a predetermined channel quality threshold; and selectively disabling the HARQ protocol based upon a first comparison result while continuing the SF between the BS and MS. In other aspects, after selectively disabling the HARQ protocol, the method further includes determining that the time-varying measure of quality of the communications channel has deteriorated below the predetermined channel quality threshold; and selectively re-enabling the HARQ protocol in the established SF.
1. A method of increasing data throughput in a wireless communications network over which a radio frequency (RF) signal is transmitted between a base station (BS) and a mobile station (MS) over a communications channel having a time-varying measure of quality, the method comprising:
enabling a hybrid automated repeat request (HARQ) protocol between the BS and the MS, wherein a service flow (SF) is established between the BS and the MS;
comparing the time-varying measure of quality of the communications channel with a predetermined channel quality threshold, wherein the time-varying measure of quality of the communications channel is determined based upon a ratio of a statistic of a Physical Carrier-to-Interference-Ratio (PCINR) reported by the MS and a packet error rate for packets transmitted between the BS and the MS; and
selectively disabling the HARQ protocol based upon a comparison result of said comparing operation while continuing the SF between the BS and MS.
2. The method of claim 1 , wherein the statistic comprises a Standard Deviation (SD) of the PCINR.
3. The method of claim 2 , wherein the packet error rate, r=NACK/((ACK+NACK).
4. The method of claim 1 , wherein, after selectively disabling the HARQ protocol:
determining that the time-varying measure of quality of the communications channel has deteriorated below the predetermined channel quality threshold; and
selectively reenabling the HARQ protocol in the established SF.
5. The method of claim 4 , wherein, after the HARQ protocol is selectively reenabled, maintaining the HARQ protocol as enabled, based upon a determination that the time-varying measure of quality of the communications channel is determined to be greater than an operator-selectable first threshold value.
6. The method of claim 1 , wherein, after the HARQ protocol is selectively disabled, maintaining the HARQ protocol as disabled, based upon a determination that the time-varying measure of quality of the communications channel is determined to be less than an operator-selectable second threshold value.
7. The method of claim 1 , wherein the HARQ protocol is used in a WiMAX network implemented, at least in part, under the IEEE Standard 802.16.
8. A base station (BS) coupled to one or more subscriber stations (SS) and/or mobile stations (MS) over a wireless radio access network (RAN), the base station comprising:
a transceiver;
a baseband processor coupled to said transceiver; and
a hybrid automatic repeat request (HARQ.) processor coupled to said baseband processor, said HARQ processor comprising:
a channel quality evaluation module configured to determine a relative channel quality based upon a ratio of a statistic of a Physical Carrier-to-Interference-Ratio (PCINR) reported by one of the one or more subscriber stations (SS) and/or mobile stations (MS) and a packet error rate for packets transmitted between the BS and the SS and/or MS; and
a HARQ enable/disable controller operatively coupled to said channel quality evaluation module and configured to selectively enable and/or disable a HARQ protocol within an established service flow (SF) based upon the relative channel quality.
9. The base station of claim 8 , wherein said HARQ processor further comprises an ACK/NACK processing module configured to determine the packet error rate r, wherein r=NACK/(ACK+NACK).
10. The base station of claim 8 , wherein the statistic comprises a Standard Deviation (SD) of the PCINR.
11. A non-transitory computer-readable storage medium storing computer readable code thereon which, when executed by a computer, causes the computer to carry out operations related to increasing data throughput in a wireless communications network over which a radio frequency (RF) signal is transmitted between a base station (BS) and a mobile station (MS) over a communications channel having a time-varying measure of quality, the operations comprising:
enabling a hybrid automated repeat request (HARQ) protocol between the BS and the MS, wherein a service flow (SF) is established between the BS and the MS;
comparing the time-varying measure of quality of the communications channel with a predetermined channel quality threshold, wherein the time-varying measure of quality of the communications channel is determined based upon a ratio of a statistic of a Physical Carrier-to-Interference-Ratio (PCINR) reported by the MS and a packet error rate for packets transmitted between the BS and the MS; and
selectively disabling the HARQ protocol based upon a comparison result of said comparing operation while continuing the SF between the BS and MS.
12. The computer-readable storage medium of claim 11 , wherein the statistic comprises a Standard Deviation (SD) of the PCINR.
13. The computer-readable storage medium of claim 11 , wherein the packet error rate, r=NACK/(ACK+NACK).