Utilization of overhead channel quality metrics in a cellular network
View Patent ↗In a 3G cellular network, a Reverse Link Channel Quality Indicator Channel (R-CQICH) may be transmitted on a reverse link to support forward link high-speed data transmissions. Accordingly, the R-CQICH may be utilized to track the quality of the signal path between the wireless unit and the base station. The base station may include a CQI component that utilizes a received Channel Quality Indicator (CQI) signal from the wireless unit to generate CQI quality metrics based on the quality of the received signal. Also, the CQI quality metrics may be compared to different thresholds to adjust various system configurations in the base station. The base station may also provide feedback to the wireless unit with the updated system configurations. This technique allows CQI quality metrics to be utilized to adjust system configurations dynamically and enhance the operation of a wireless system.
1. A method comprising:
generating quality metrics from a decoding process for a received channel quality indicator (CQI), wherein the quality metrics comprise short-term soft decision quality metrics and long-term soft decision quality metrics that are associated with a quality of the received CQI, wherein the long-term soft decision quality metrics are generated by filtering frame based quality metrics over a plurality of frames;
comparing at least one of the quality metrics to a quality setting; and
determining whether to dynamically adjust a CQI channel configuration based on the comparison.
2. The method, as set forth in claim 1 , wherein the CQI channel configuration comprises a R-CQICH mode setting of a full mode or a differential mode, and the comparison comprises comparing one of the long-term quality metrics to the quality setting.
3. The method, as set forth in claim 1 , wherein the CQI channel configuration comprises a reverse link outer loop power control setting, and the comparison comprises comparing one of the short-term quality metrics to the quality setting.
4. The method, as set forth in claim 1 , wherein the CQI channel configuration comprises a repetition factor, and the comparison comprises comparing one of the long-term quality metrics to the quality setting.
5. The method, as set forth in claim 1 , comprising generating the short-term quality metrics by accumulating a plurality of quality information from the decoding process over a CQI frame.
6. The method, as set forth in claim 1 , comprising generating a plurality of erasures for differential reports based on a CQI differential bit decision metric.
7. The method, as set forth in claim 1 , wherein the method is performed at a base station in a wireless communications system.
8. The method, as set forth in claim 1 , comprising transmitting an adjustment for the CQI channel configuration to a wireless unit.
9. A system comprising:
means for generating soft decision quality metrics from a decoding process for a received channel quality indicator (CQI), wherein the soft decision quality metrics comprise short-term quality metrics and long-term quality metrics that are associated with a quality of the received CQI, the long-term quality metrics being generated by filtering frame based quality metrics over a period of more than one frame;
means for comparing at least one of quality metrics to a quality setting; and
means for determining whether to dynamically adjust a CQI channel configuration based on the comparison.
10. The system, as set forth in claim 9 , wherein the CQI channel configuration comprises a R-CQICH mode setting of a full mode or a differential mode, and the means for comparing compares one of the long-term quality metrics to the threshold quality setting.
11. The system, as set forth in claim 9 , wherein the CQI channel configuration comprises a reverse link outer loop power control setting, and the means for comparing compares one of the short-term quality metrics to the threshold quality setting.
12. The system, as set forth in claim 9 , wherein the CQI channel configuration comprises a repetition factor, and the means for comparing compares one of the long-term quality metrics to the threshold quality setting.
13. The system, as set forth in claim 9 , wherein the means for generating quality metrics comprising a means for generating the short-term quality metrics by accumulating a plurality of quality information from the decoding process over a CQI frame.
14. The system, as set forth in claim 9 , wherein the system is performed at a base station in a wireless communications system.
15. A method comprising:
generating quality soft decision metrics in a decoding process associated with a quality of the received channel quality indicator (CQI), wherein the soft decision metrics are generated using erasure metrics accumulated over a frame;
comparing one of quality soft decision metrics to a threshold quality setting; and
determining whether to dynamically adjust at least one of a mode setting, a reverse link outer loop power control setting, or a repetition factor based on the comparison.
16. The method, as set forth in claim 15 , wherein the mode setting comprises a full mode or a differential mode setting.
17. The method, as set forth in claim 15 , comprising transmitting an adjustment to a wireless unit if the determination is to dynamically adjust at least one of the mode setting, the reverse link outer loop power control setting, or the repetition factor.
18. The method, as set forth in claim 15 , comprising generating long-term metrics by accumulating a plurality of quality metrics over a period of more than one frames.