Method and system for excess resource distribution in a communication system
First Claim
1. In a wireless communication system which supports a plurality of modulation/coding rates, a method for transmitting signals comprising the steps of:
- determining a reference resource size for each of a plurality of planned links in the communication system;
determining a modulation/coding rate for each of the planned links, each modulation/coding rate being associated with a minimum resource size; and
determining excess resources based upon differences between the reference resource size and the minimum resource size for each of the planned links;
distributing the excess resources among the planned links based on a system criterion;
wherein the step of determining a modulation/coding rate comprises the steps of;
determining the modulation/coding rate for each of the planned links from a predetermined set of modulation/coding rates, the predetermined set including a maximum modulation/coding rate; and
wherein the step of distributing comprises the step of;
identifying a non-maximum group of planned links which are not set to the maximum modulation/coding rate;
identifying one of the planned links in the non-maximum group which has the highest signal quality; and
distributing the excess resources such that the one of the planned links is modulated at the maximum modulation/coding rate.
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Accused Products
Abstract
A method and system (102) provide adaptive modulation/coding with distribution of excess resources based on one or more system criteria. The system (102) may be any system with more than one modulation rate or more than one coding rate and may be a wireless communication system using CDMA, TDMA, OFDM or any other signal formats. Generally, the method determines excess resources of the system based on desired characteristics of links supported by the system. The excess resources may be any number of system resources, such as transmit power. These excess resources are then distributed to the links based on various system criteria, such as to increase system coverage, to increase system capacity, to modify a data rate profile of the system or to reduce interference in the system. Methods for providing such distribution of the excess resources are also provided for equal data rate systems.
195 Citations
26 Claims
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1. In a wireless communication system which supports a plurality of modulation/coding rates, a method for transmitting signals comprising the steps of:
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determining a reference resource size for each of a plurality of planned links in the communication system;
determining a modulation/coding rate for each of the planned links, each modulation/coding rate being associated with a minimum resource size; and
determining excess resources based upon differences between the reference resource size and the minimum resource size for each of the planned links;
distributing the excess resources among the planned links based on a system criterion;
wherein the step of determining a modulation/coding rate comprises the steps of;
determining the modulation/coding rate for each of the planned links from a predetermined set of modulation/coding rates, the predetermined set including a maximum modulation/coding rate; and
wherein the step of distributing comprises the step of;
identifying a non-maximum group of planned links which are not set to the maximum modulation/coding rate;
identifying one of the planned links in the non-maximum group which has the highest signal quality; and
distributing the excess resources such that the one of the planned links is modulated at the maximum modulation/coding rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. In a wireless communication system, a method for transmitting signals at desired rates comprising the steps of:
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determining a reference modulation/coding rate for each of a plurality of planned links, based on a signal quality of each of the planned links and modulation/coding rates supported by the system;
determining a reference resources size and an associated reference link capacity for each of the planned links in the communication system;
determining a target link capacity for each of the planned links in the communication system; and
assigning a resource size to each of the planned links such that each link capacity matches its corresponding target link capacity;
wherein minimum and maximum desired link capacities are selected, and wherein;
if the target link capacity is greater than the maximum desired link capacity, the target link capacity is set to the maximum desired link capacity; and
if the target link capacity is less than the minimum desired link capacity, the target link capacity is set to the minimum desired link capacity. - View Dependent Claims (21, 22)
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23. In a wireless communication system which supports a plurality of modulation/coding rates, a method for transmitting signals comprising the steps of:
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determining a reference resource size for each of a plurality of planned links in the communication system;
determining a modulation/coding rate for each of the planned links, each modulation/coding rate being associated with a minimum resource size; and
determining excess resources based upon differences between the reference resource size and the minimum resource size for each of the planned links;
distributing the excess resources among the planned links based on a system criterion;
wherein the step of distributing the excess resources comprises the step of distributing the excess resources to increase system coverage;
wherein a minimum signal quality is required before signals can be transmitted over the planned links, and wherein the step of distributing the excess resources comprises the steps of;
determining whether a signal quality for any of the planned links at the reference resource size is less than the minimum signal quality; and
distributing the excess resources among the planned links with the signal quality less than the minimum signal quality.
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24. In a wireless communication system which supports a plurality of modulation/coding rates, a method for transmitting signals comprising the steps of:
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determining a reference resource size for each of a plurality of planned links in the communication system;
determining a modulation/coding rate for each of the planned links, each modulation/coding rate being associated with a minimum resource size; and
determining excess resources based upon differences between the reference resource size and the minimum resource size for each of the planned links;
distributing the excess resources among the planned links based on a system criterion;
wherein the step of distributing the excess resources comprises the step of distributing the excess resources to increase system capacity;
wherein the step of distributing the excess resources comprises the steps of;
determining a reference modulation/coding rate for each of the planned links;
determining for each of the planned links additional link transmit power required to increase the reference modulation/coding rate to a higher modulation/coding rate; and
determining an aggregate of the additional link transmit power which substantially maximizes the system capacity. - View Dependent Claims (25, 26)
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Specification