System and method for radio frequency resource allocation
View Patent ↗Systems and methods for allocating radio frequency resources are provided. The radio frequency resources are allocated to a mobile station in time or frequency alignment based on signal quality measures. In an orthogonal frequency division multiple access system, the allocated radio frequency resources include one or more tones and one or more symbols.
1. A method for radio frequency resource allocation, the method comprising the acts of:
determining that radio frequency resources are to be allocated to a plurality of mobile stations in an uplink subframe;
determining a signal quality measure for each mobile station of the plurality of mobile stations; and
allocating the radio frequency resources in a time alignment within the uplink subframe for mobile stations of the plurality of mobile stations with a determined signal quality measure below a predetermined threshold and then allocating the radio frequency resources within the uplink subframe for mobile stations of the plurality of mobile stations with a determined signal quality measure above the predetermined threshold, wherein at least a first one of the mobile stations with a determined signal quality measure above the predetermined threshold is allocated the radio frequency resources in time alignment in the uplink subframe and at least a second one of the mobile stations with a determined signal quality measure above the predetermined threshold is allocated the radio frequency resources in frequency alignment in the uplink subframe,
wherein the radio frequency resources includes a number of frequencies and symbols of the subframe, wherein the plurality of mobile stations communicate with a wireless communication system using orthogonal frequency division multiple access (OFDMA),
wherein the mobile stations allocated radio frequency resources in time alignment are allocated more OFDM symbols but less frequencies than the mobile stations allocated radio frequency resources in frequency alignment.
2. The method of claim 1 , wherein the radio frequency resource allocation is also based on a quality of service for the plurality of mobile stations.
3. The method of claim 1 , further comprising the acts of:
informing the plurality of mobile stations of the radio frequency resource allocation.
4. The method of claim 1 , wherein the signal quality measure is a signal-to-interference-plus noise ratio (SINR).
5. A method for radio frequency resource allocation, the method comprising the acts of:
determining that a radio frequency resource is to be allocated to a mobile station;
determining a signal quality measure for the mobile station; and
allocating the radio frequency resource to the mobile station in a time or frequency alignment within an uplink subframe based on the signal quality measure, wherein the radio frequency resource is allocated in a time alignment when the signal quality measure is below a predetermined threshold and the radio frequency resource is allocated in frequency alignment when the signal quality measure is above the predetermined threshold, and wherein the mobile station communicates with a base station using orthogonal frequency division multiple access (OFDMA),
wherein allocation of radio frequency resource in time alignment involves allocating more OFDM symbols but less frequencies than allocation of radio frequency resource in frequency alignment,
wherein radio frequency resources are first allocated to mobile stations with signal quality measures below the predetermined threshold, and then allocated to mobile stations with signal quality measures above the predetermined threshold.
6. The method of claim 5 wherein the predetermined threshold is fixed.
7. The method of claim 5 , wherein the predetermined threshold is dynamic.
8. A base station, comprising:
a memory; and
a processor, coupled to the memory, the processor including
a scheduler,
logic for determining a signal quality measure for each of a plurality of mobile stations, and
logic for allocating radio frequency resources in a time alignment within an uplink subframe for mobile stations of the plurality of mobile stations with a determined signal quality measure below a predetermined threshold and then allocating the radio frequency resources within the uplink subframe for mobile stations of the plurality of mobile stations with a determined signal quality measure above the predetermined threshold, wherein at least a first one of the mobile stations with a determined signal quality measure above the predetermined threshold is allocated the radio frequency resources in time alignment in the uplink subframe and at least a second one of the mobile stations with a determined signal quality measure above the predetermined threshold is allocated the radio frequency resources in frequency alignment in the uplink subframe, wherein the radio frequency resource includes a number of frequencies and symbols of the subframe, wherein the plurality of mobile stations communicate with a wireless communication system using orthogonal frequency division multiple access (OFDMA), wherein the mobile stations allocated radio frequency resources in time alignment are allocated more OFDM symbols but less frequencies than the mobile stations allocated radio frequency resources in frequency alignment.
9. The base station of claim 8 , wherein the radio frequency resource allocation is also based on a quality of service for the plurality of mobile stations.
10. The base station of claim 8 , wherein the signal quality measure is a signal-to-interference-plus noise ratio (SINR).
11. The base station of claim 8 , wherein the predetermined threshold is fixed.
12. The base station of claim 8 , wherein the predetermined threshold is dynamic.
13. The method of claim 5 , wherein the radio frequency resource is allocated to a first plurality of mobile stations in the uplink subframe in time alignment and to a second plurality of mobile stations in the uplink subframe in frequency alignment.