Abstract
A criterion for biasing a binary decision requiring an unequal protection which utilizes a measured signal to interference ratio (SIR). The SIR may be derived from a determination of channel estimation. The SIR is compared against a threshold the threshold being selected to bias the decision toward a not acknowledge (NACK) as opposed to an acknowledge (ACK) determination. The technique is advantageous for providing biased binary decisions for high speed downlink packets (HSDP) but may be utilized for both uplink and downlink applications.
| Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | |||||
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| 3G | 20/03/2007 | ISLD-200802-001 | INTERDIGITAL INC |
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| Publication No | Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | Status | National Phase Entries | |||||
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Technologies
Multiple access
Product
Use Cases
Wireless communication
Services
Claim
1. A method for use by a wireless unit and employing criteria for biasing a binary decision by adjustment of a threshold used for the binary decision to provide unequal protection of a received communication, comprising the steps of:
receiving the communication in a given channel;
obtaining a signal to interference ratio (SIR) of the communication channel;
comparing the SIR against the threshold, said threshold being adjusted based on criteria including at least a noise component and being selected to bias the binary decision toward a determination that a received data communication is interpreted as having an error; and
generating one of a non-acknowledgement (NACK) or an acknowledgement (ACK) based only on the result of the comparison of the SIR with the threshold; wherein
the determination of the received communication as having no error being responsive to said SIR being greater than said threshold and independent of and eliminating a need for an error detection operation on the received communication which is accepted by the wireless unit.', 'receiving the communication in a given channel;', 'obtaining a signal to interference ratio (SIR) of the communication channel;', 'comparing the SIR against the threshold, said threshold being adjusted based on criteria including at least a noise component and being selected to bias the binary decision toward a determination that a received data communication is interpreted as having an error; and', 'generating one of a non-acknowledgement (NACK) or an acknowledgement (ACK) based only on the result of the comparison of the SIR with the threshold; wherein', 'the determination of the received communication as having no error being responsive to said SIR being greater than said threshold and independent of and eliminating a need for an error detection operation on the received communication which is accepted by the wireless unit.
2. A method for use by a wireless unit and employing criteria for biasing a binary decision by adjustment of a threshold used for the binary decision to provide unequal protection of a received communication, comprising the steps of:
receiving the communication in a given channel;
obtaining a signal to interference ratio (SIR) of the communication channel;
comparing the SIR against the threshold, said threshold being adjusted based on criteria including at least a noise component and being selected to bias the binary decision toward a determination that a received data communication is interpreted as having an error; and
generating one of a non-acknowledgement (NACK) or an acknowledgement (ACK) based only on the result of the comparison of the SIR with the threshold;
wherein criteria for biasing the binary decision comprises:
combining, with noise, each of a plurality of test signals having signal strengths extending over a given range;
determining correctness of each combined signal;
determining instances of correct signals and incorrect signals at each signal strength; and
selecting a threshold which provides an acceptable number of false declarations of an ACK condition.', 'receiving the communication in a given channel;', 'obtaining a signal to interference ratio (SIR) of the communication channel;', 'comparing the SIR against the threshold, said threshold being adjusted based on criteria including at least a noise component and being selected to bias the binary decision toward a determination that a received data communication is interpreted as having an error; and', 'generating one of a non-acknowledgement (NACK) or an acknowledgement (ACK) based only on the result of the comparison of the SIR with the threshold;', 'wherein criteria for biasing the binary decision comprises:', 'combining, with noise, each of a plurality of test signals having signal strengths extending over a given range;', 'determining correctness of each combined signal;', 'determining instances of correct signals and incorrect signals at each signal strength; and', 'selecting a threshold which provides an acceptable number of false declarations of an ACK condition.
3. The method of claim 2 wherein said SIR is obtained by initially obtaining a channel estimation of said given channel and deriving the SIR from the channel estimation.
4. The method of claim 2 wherein signal amplitude is employed as a measure of signal strength.
5. The method of claim 2 wherein the threshold is greater than a level of the noise taken alone.
6. The method of claim 2 further comprising:
setting the threshold at a level that is low enough so that an acceptable low frequency of errors occurs for SIRs above the threshold and high enough to prevent an unacceptable high number of errors for SIRs below the threshold.', 'setting the threshold at a level that is low enough so that an acceptable low frequency of errors occurs for SIRs above the threshold and high enough to prevent an unacceptable high number of errors for SIRs below the threshold.
7. The method of claim 2 wherein the channel estimation is based on a communication received from a sender.
8. Apparatus for a wireless unit employing criteria for biasing a binary decision providing unequal protection of a received communication, comprising:
a receiver configured to receive the communication in a given channel;
a unit configured to obtain a signal to interference ratio (SIR) of the communication channel; and
a comparison unit configured to compare the SIR against a given threshold;
a unit configured to set said threshold based on certain criteria, including at least a noise component, so that said threshold level is increased to bias the binary decision toward providing a determination that the received communication contains an error; said comparison unit generating one of a non-acknowledgement (NACK) or an acknowledgement (ACK) based only on the result of the comparison of the SIR with the threshold; wherein
a determination that the received communication should be retransmitted is obtained by setting the threshold so that it is at least greater than said noise component and independent of and without need for performing an error detection operation on the received communication and a determination that the received communication is accepted and does not have to be retransmitted is obtained when the SIR is greater than the threshold.', 'a receiver configured to receive the communication in a given channel;', 'a unit configured to obtain a signal to interference ratio (SIR) of the communication channel; and', 'a comparison unit configured to compare the SIR against a given threshold;', 'a unit configured to set said threshold based on certain criteria, including at least a noise component, so that said threshold level is increased to bias the binary decision toward providing a determination that the received communication contains an error; said comparison unit generating one of a non-acknowledgement (NACK) or an acknowledgement (ACK) based only on the result of the comparison of the SIR with the threshold; wherein', 'a determination that the received communication should be retransmitted is obtained by setting the threshold so that it is at least greater than said noise component and independent of and without need for performing an error detection operation on the received communication and a determination that the received communication is accepted and does not have to be retransmitted is obtained when the SIR is greater than the threshold.
9. Apparatus for a wireless unit employing criteria for biasing a binary decision providing unequal protection of a received communication, comprising:
a receiver configured to receive the communication in a given channel;
a unit configured to obtain a signal to interference ratio (SIR) of the communication channel; and
a comparison unit configured to compare the SIR against a given threshold;
a unit configured to set said threshold based on certain criteria, including at least a noise component, so that said threshold level is increased to bias the binary decision toward providing a determination that the received communication contains an error; said comparison unit generating one of a non-acknowledgement (NACK) or an acknowledgement (ACK) based only on the result of the comparison of the SIR with the threshold;
said unit for setting the threshold further comprising:
a unit configured to set the threshold by combining, with noise, each of a plurality of test signals having signal strengths extending over a given range;
a unit configured to determine correctness of each combined signal;
a unit configured to determine instances of correct signals and incorrect signals at each signal strength; and
a unit configured to select the threshold to provide an acceptable number of false declarations of an ACK condition.', 'a receiver configured to receive the communication in a given channel;', 'a unit configured to obtain a signal to interference ratio (SIR) of the communication channel; and', 'a comparison unit configured to compare the SIR against a given threshold;', 'a unit configured to set said threshold based on certain criteria, including at least a noise component, so that said threshold level is increased to bias the binary decision toward providing a determination that the received communication contains an error; said comparison unit generating one of a non-acknowledgement (NACK) or an acknowledgement (ACK) based only on the result of the comparison of the SIR with the threshold;', 'said unit for setting the threshold further comprising:', 'a unit configured to set the threshold by combining, with noise, each of a plurality of test signals having signal strengths extending over a given range;', 'a unit configured to determine correctness of each combined signal;', 'a unit configured to determine instances of correct signals and incorrect signals at each signal strength; and', 'a unit configured to select the threshold to provide an acceptable number of false declarations of an ACK condition.', '10. The apparatus of claim 9 wherein said SIR is obtained by a unit for initially obtaining a channel estimation, said unit for obtaining the SIR generating the SIR based on the channel estimation.', '11. The apparatus of claim 9 wherein the unit for combining is configured to use signal amplitude as a measure of signal strength.', '12. The apparatus of claim 9 wherein the threshold is set so as to be greater than a signal strength of the noise component taken alone.', '13. The apparatus of claim 9 wherein the unit for initially obtaining the channel estimation is configured to obtain the channel estimation based on a communication from a sender.']
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