Method and system for mitigating interference in communication system
First Claim
1. A method for mitigating interference in a communication system comprising at least one base station and at least one terminal, a channel existing between the at least one base station and the at least one terminal, the channel comprising at least a first signal channel and a second signal channel, a first signal being communicated through the first signal channel, a second signal being communicated through the second signal channel, transmission and reception of signal in the communication system being done through the signal channels, the signal received through the channels comprising the first signal, the second signal and noise, the method comprising the steps of:
- a. determining channel characteristics at one receiving end, the determination of the channel characteristics being based on at least the first signal, total signal quality being based on at least the second signal, and noise characteristics, wherein the receiving end being at least one of a terminal and base station;
b. computing a rate limit of the channels at the receiving end, the computation of the rate limit of the channels being based on at least the channel characteristics, the total signal quality, and the noise characteristics;
c. computing a rate assignment of the channels at the base station, the computation of the rate assignment of the channels being based on control information containing at least the rate limit; and
d. assigning the computed rate assignment to the channels for mitigating interference in the communication system,wherein the total signal quality is a Signal-to-all interference-plus-thermal-Noise Ratio (SINR),wherein the SINR is being computed for each of the terminals by using estimated symbols at each of the terminals, wherein symbol estimation is carried out by using one of a linear joint detection and a non-linear joint detection with group successive interference cancellation.
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Abstract
A method and system for mitigating interference in a communication system, comprising at least one base station and at least one terminal, are disclosed. The base stations and terminals communicate through a channel existing between them, and the channels include at least a first signal channel and a second signal channel. The method includes determination of channel, noise and self-interference characteristic, computation of a rate limit of the channels, computation of the rate assignment of the channels, and assignment of the computed rate assignments to the channels. In another aspect of the present invention, the method includes determination of channel characteristics; computation of a power control margin, self-interference characteristics, power control command; and assignment of the computed power control command to each communicating terminal and base station. The above power and rate control methods may operate jointly to mitigate both intra-cell and inter-cell interference in wireless communication systems.
28 Citations
18 Claims
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1. A method for mitigating interference in a communication system comprising at least one base station and at least one terminal, a channel existing between the at least one base station and the at least one terminal, the channel comprising at least a first signal channel and a second signal channel, a first signal being communicated through the first signal channel, a second signal being communicated through the second signal channel, transmission and reception of signal in the communication system being done through the signal channels, the signal received through the channels comprising the first signal, the second signal and noise, the method comprising the steps of:
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a. determining channel characteristics at one receiving end, the determination of the channel characteristics being based on at least the first signal, total signal quality being based on at least the second signal, and noise characteristics, wherein the receiving end being at least one of a terminal and base station; b. computing a rate limit of the channels at the receiving end, the computation of the rate limit of the channels being based on at least the channel characteristics, the total signal quality, and the noise characteristics; c. computing a rate assignment of the channels at the base station, the computation of the rate assignment of the channels being based on control information containing at least the rate limit; and d. assigning the computed rate assignment to the channels for mitigating interference in the communication system, wherein the total signal quality is a Signal-to-all interference-plus-thermal-Noise Ratio (SINR), wherein the SINR is being computed for each of the terminals by using estimated symbols at each of the terminals, wherein symbol estimation is carried out by using one of a linear joint detection and a non-linear joint detection with group successive interference cancellation. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for mitigating interference in a communication system comprising at least one base station and at least one terminal, a channel existing between the at least one base station and the at least one terminal, the channel comprising at least a first signal channel and a second signal channel, a first signal being communicated through the first signal channel, a second signal being communicated through the second signal channel, transmission and reception of signal in the communication system being done through the signal channels, the signal received through the channels comprising the first signal, the second signal and noise, the method comprising the steps of:
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a. determining channel characteristics at one receiving end, the determination of the channel characteristics being based on at least the first signal, total signal quality being based on at least the second signal, and noise characteristics, wherein the receiving end being at least one of a terminal and base station; b. computing a rate limit of the channels at the receiving end, the computation of the rate limit of the channels being based on at least the channel characteristics, the total signal quality, and the noise characteristics; c. computing a rate assignment of the channels at the base station, the computation of the rate assignment of the channels being based on control information containing at least the rate limit; and d. assigning the computed rate assignment to the channels for mitigating interference in the communication system, wherein the noise comprises an inter-cell interference and thermal noise, wherein the noise is being obtained by subtracting an estimated intra-cell signal from one of the first and the second signal. - View Dependent Claims (8, 9, 10)
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11. A method for mitigating interference in a communication system comprising at least one base station and at least one terminal, a channel existing between the at least one base station and the at least one terminal, the channel comprising at least a first signal channel and a second signal channel, a first signal being communicated through the first signal channel, a second signal being communicated through the second signal channel, transmission and reception of signal in the communication system being done through the signal channels, the signal received through the channels comprising the first signal, the second signal and noise, the method comprising the steps of:
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a. determining channel characteristics at one receiving end, the determination of channel characteristics being based on at least the first signal, total signal quality based on at least the second signal, and noise characteristics, wherein the receiving end being at least one of a terminal and base station; b. computing a power control margin at the receiving end by using at least an estimated and a received signal quality characteristic of a current frame and previous frames; c. computing self-interference characteristics at the receiving end by using at least the first and the second signal; d. computing a power control command at the receiving end, the computation of power control command being based on at least the power control margin, noise characteristics, and the self-interference characteristics; and e. assigning the computed power control command to each communicating terminal and base station for mitigating interference in the communication system, wherein the computing of a power control command generates a transmission power increment value, the computation of the transmission power increment value depending on at least a combination Signal-to-inter-cell-interference-plus-thermal Noise Ratio (SNR), Signal-to-all interference-plus-thermal-Noise Ratio (SINR), power control margin (PCM), and a signal quality power threshold for a selected combination of channel coding and modulation scheme. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification