Hybrid scheme for DL link adaptation

1. A system for a hybrid scheme of DL link adaptation in a network having a plurality of mobile stations (MSs) communicably coupled to a base station (BS), the system comprising:

a mode decision module associated with the base station, the mode decision module comprising one or more processors configured to:

select a first mode configuration for use during transmission of a first communication from the base station;

receive first feedback information associated with the first communication, the first feedback information comprising a first mode recommendation and first channel information;

generate a BS-derived mode configuration based on the first channel information;

compare the first mode recommendation and the BS-derived mode configuration;

determine a second mode configuration based on the comparison; and

configure a second communication using the second mode configuration,

wherein the one or more processors of the mode decision module are further configured to:

generate a mode gap based on the comparison, wherein the mode gap indicates a difference between the first mode recommendation and the BS-derived mode configuration;

compare the mode gap against a threshold mode gap difference;

when the mode gap exceeds the threshold mode gap difference, determine that the first mode recommendation and the BS-derived mode configuration is to be tuned to generate the second mode configuration.

2. The system of claim 1 , wherein the first mode configuration comprises one or more of: a Multiple-Input-Multiple-Output (MIMO) Mode or a Modulation Coding Scheme (MCS) level.

3. The system of claim 1 , wherein the one or more processors of the mode decision module are further configured to:

determine that the first mode recommendation is to be used, wherein the first mode recommendation is selected to be used for the second mode configuration.

4. The system of claim 1 , wherein the one or more processors of the mode decision module are further configured to:

determine that the first mode recommendation is not to be used; and

select the BS-derived mode configuration to be used for the second mode configuration.

5. The system of claim 1 wherein the one or more processors of the mode decision module are further configured to:

tune the first mode recommendation and the BS-derived mode configuration to generate the second mode configuration using the results of the comparison.

6. The system of claim 5 , wherein the one or more processors of the mode decision module are further configured to:

generate an index for each of a plurality of mode configurations;

assign a first index for the first mode recommendation;

assign a second index for the BS-derived mode configuration,

wherein said tune comprises:

compare the first index with the second index;

generate a third index based on the comparison; and

determine a particular one of the plurality of mode configurations having an index that corresponds to the third index, wherein the particular one of the plurality of mode configurations is selected for the second mode configuration.

7. The system of claim 1 , wherein the one or more processors of the mode decision module are further configured to:

determine whether a time factor has been exceeded, wherein the time factor is a criteria for when to determine whether to tune the first mode recommendation and the BS-derived mode recommendation.

8. The system of claim 7 , wherein the time factor is a predefined number of frames since a prior determination whether to perform said tune.

9. The system of claim 1 , wherein the one or more processors of the mode decision module are further configured to:

receive second feedback information comprising a second mode recommendation and second channel information;

generate a second BS-derived mode configuration based on the second channel information;

compare the second mode recommendation with the second BS-derived mode configuration;

determine a third mode configuration based on the comparison; and

configure a third communication using the third mode configuration.

10. The system of claim 1 , wherein the network is a WIMAX network.

11. A mode decision device for a hybrid scheme of mode decision in a network having a plurality of mobile stations communicably coupled to a base station, the mode decision device comprising:

one or more processors configured to:

select a first mode configuration for use during transmission of a first communication from the base station;

receive first feedback information associated with the first communication, the first feedback information comprising a first mode recommendation and first channel information;

generate a BS-derived mode configuration based on the first channel information;

compare the first mode recommendation and the BS-derived mode configuration;

generate a mode gap based on the comparison, wherein the mode gap indicates a difference between the first mode recommendation and the BS-derived mode configuration;

compare the mode gap against a threshold mode gap difference;

when the mode gap exceeds the threshold mode gap difference, determine that the first mode recommendation and the BS-derived mode configuration is to be tuned to generate the second mode configuration; and

configure a second communication using the second mode configuration.

12. A computer-implemented method for implementing a hybrid scheme of DL link adaptation in a network having a plurality of mobile stations (MSs) communicably coupled to a base station (BS), the method comprising:

selecting, by one or more processors of a mode decision module associated with the base station, a first mode configuration for use during transmission of a first communication from the base station;

receiving, by the one or more processors of the mode decision module, first feedback information associated with the first communication, the first feedback information comprising a first mode recommendation and first channel information;

generating, by the one or more processors of the mode decision module, a BS-derived mode configuration based on the first channel information;

comparing, by the one or more processors of the mode decision module, the first mode recommendation and the BS-derived mode configuration;

determining, by the one or more processors of the mode decision module, a second mode configuration based on the comparison;

configuring, by the one or more processors of the mode decision module, a second communication using the second mode configuration; and

generating, by the one or more processors of the mode decision module, a mode gap based on the comparison, wherein the mode gap indicates a difference between the first mode recommendation and the BS-derived mode configuration;

comparing, by the one or more processors of the mode decision module, the mode gap against a threshold mode gap difference;

when the mode gap exceeds the threshold mode gap difference, determining, by the one or more processors of the mode decision module, that the first mode recommendation and the BS-derived mode configuration is to be tuned to generate the second mode configuration.

13. The method of claim 12 , wherein the first mode configuration comprises one or more of: a Multiple-Input-Multiple-Output (MIMO) Mode or a Modulation Coding Scheme (MCS) level.

14. The method of claim 12 , the further comprising:

determining, by the one or more processors of the mode decision module, that the first mode recommendation is to be used, wherein the first mode recommendation is selected to be used for the second mode configuration.

15. The method of claim 12 , the method further comprising

determining, by the one or more processors of the mode decision module, that the first mode recommendation is not to be used; and

selecting, by the one or more processors of the mode decision module, the BS-derived mode configuration to be used for the second mode configuration.

16. The method of claim 12 , the method further comprising:

tuning, by the one or more processors of the mode decision module, the first mode recommendation and the BS-derived mode configuration to generate the second mode configuration using the results of the comparison.

17. The method of claim 16 , the method further comprising:

generating, by the one or more processors of the mode decision module, an index for each of a plurality of mode configurations;

assigning, by the one or more processors of the mode decision module, a first index for the first mode recommendation;

assigning, by the one or more processors of the mode decision module, a second index for the BS-derived mode configuration,

wherein said tuning further comprises:

comparing, by the one or more processors of the mode decision module, the first index with the second index;

generating, by the one or more processors of the mode decision module, a third index based on the comparison; and

determining, by the one or more processors of the mode decision module, a particular one of the plurality of mode configurations having an index that corresponds to the third index, wherein the particular one of the plurality of mode configurations is selected for the second mode configuration.

18. The method of claim 12 , the method further comprising:

determining, by the one or more processors of the mode decision module, whether a time factor has been exceeded, wherein the time factor is a criteria for when to determine whether to tune the first mode recommendation and the BS-derived mode recommendation.

19. The method of claim 18 , wherein the time factor is a predefined number of frames since a prior determination whether to perform said tune.

20. The method of claim 12 , the method further comprising:

receiving, by the one or more processors of the mode decision module, second feedback information comprising a second mode recommendation and second channel information;

generating, by the one or more processors of the mode decision module, a second BS-derived mode configuration based on the second channel information;

comparing, by the one or more processors of the mode decision module, the second mode recommendation with the second BS-derived mode configuration;

determining, by the one or more processors of the mode decision module, a third mode configuration based on the comparison; and

configuring, by the one or more processors of the mode decision module, a third communication using the third mode configuration.

21. The method of claim 12 , wherein the network is a WIMAX network.

22. A non-transitory computer-readable storage medium storing computer executable instructions for a hybrid scheme of DL link adaptation in a network having a plurality of mobile stations (MSs) communicably coupled to a base station (BS), the instructions, when executed, configuring one or more processors to perform the functions of:

selecting, by the BS, a first mode configuration for use during transmission of a first communication from the base station;

receiving, by the BS, first feedback information associated with the first communication, the first feedback information comprising a first mode recommendation and first channel information;

generating, by the BS, a BS-derived mode configuration based on the first channel information;

comparing, by the BS, the first mode recommendation and the BS-derived mode configuration;

generating a mode gap based on the comparison, wherein the mode gap indicates a difference between the first mode recommendation and the BS-derived mode configuration;

comparing the mode gap against a threshold mode gap difference;

responsive to the mode gap exceeding the threshold mode gap difference, determining that the first mode recommendation and the BS-derived mode configuration is to be tuned to generate the second mode configuration; and

configuring, by the BS, a second communication using the second mode configuration.