US 2013/0156013 A1 · USER EQUIPMENT REFERENCE SIGNAL-BASED TIMING ESTIMATION

Abstract

Estimation of timing errors is disclosed that uses user equipment reference signals (UERSs). A UE models each channel in a user equipment reference signal (UERS) as a channel on an adjacent UERS tone multiplied by a phase ramping term. This phase ramping term is determined using an estimator on the modeled channels. The UE then determines the equivalent timing error by mapping the phase ramping terms into the estimated timing errors in the time domain. In coordinated multipoint (CoMP) systems, the UERS-based timing error may be used to identify an aligned common reference signal (CRS) associated with the network entity transmitting the data. With this determination, the UE may estimate a CRS-based timing error and either substitute the CRS-based timing error for the UERS-based timing error or calculate a further average timing error based on both the CRS-based and UERS-based timing errors.

Claims28

Dependent claims

A method of wireless communication, comprising:

receiving user equipment reference signal (UERS);
receiving at least one common reference signal (CRS);
estimating at least one CRS timing estimation based on each of the at least one CRS, respectively, estimating a UERS timing estimation based, at least in part, on the UERS;
determining a timing differential between the UERS timing estimation and each of the at least one CRS timing estimations;
identifying, based on the timing differential, an aligned CRS timing estimation associated with one of the at least one CRS timing estimations;
and
demodulating data carried in the downlink data channel based on an a substitute timing estimate, the substitute timing estimate being one of:
the aligned CRS timing estimation;
or
an average timing error estimate, wherein the average timing error estimate is based on a combination of the aligned CRS timing estimation and the UERS timing estimation.

7 more elements

An apparatus configured for wireless communication, comprising:

means for receiving user equipment reference signal (UERS);
means for receiving at least one common reference signal (CRS);
means for estimating at least one CRS timing estimation based on each of the at least one CRS, respectively,
means for estimating a UERS timing estimation based, at least in part, on the UERS;
means for determining a timing differential between the UERS timing estimation and each of the at least one CRS timing estimations;
means for identifying, based on the timing differential, an aligned CRS timing estimation associated with one of the at least one CRS timing estimations;
and
means for demodulating data carried in the downlink data channel based on an a substitute timing estimate, the substitute timing estimate being one of:
the aligned CRS timing estimation;
or
an average timing error estimate, wherein the average timing error estimate is based on a combination of the aligned CRS timing estimation and the UERS timing estimation.

8 more elements

A computer program product for wireless communications in a wireless network, comprising:

a computer-readable medium having program code recorded thereon, the program code comprising:
program code to receive user equipment reference signal (UERS);
program code to receive at least one common reference signal (CRS);
program code to estimate at least one CRS timing estimation based on each of the at least one CRS, respectively,
program code to estimate a UERS timing estimation based, at least in part, on the UERS;
program code to determine a timing differential between the UERS timing estimation and each of the at least one CRS timing estimations;
program code to identify, based on the timing differential, an aligned CRS timing estimation associated with one of the at least one CRS timing estimations;
and
program code to demodulate data carried in the downlink data channel based on an a substitute timing estimate, the substitute timing estimate being one of:
the aligned CRS timing estimation;
or
an average timing error estimate, wherein the average timing error estimate is based on a combination of the aligned CRS timing estimation and the UERS timing estimation.

9 more elements

An apparatus configured for wireless communication, the apparatus comprising

at least one processor;
and
a memory coupled to the at least one processor,
wherein the at least one processor is configured:
to receive user equipment reference signal (UERS);
to receive at least one common reference signal (CRS);
to estimate at least one CRS timing estimation based on each of the at least one CRS, respectively,
to estimate a UERS timing estimation based, at least in part, on the UERS;
to determine a timing differential between the UERS timing estimation and each of the at least one CRS timing estimations;
to identify, based on the timing differential, an aligned CRS timing estimation associated with one of the at least one CRS timing estimations;
and
to demodulate data carried in the downlink data channel based on an a substitute timing estimate, the substitute timing estimate being one of:
the aligned CRS timing estimation;
or
an average timing error estimate, wherein the average timing error estimate is based on a combination of the aligned CRS timing estimation and the UERS timing estimation.

12 more elements

Dependencies are inferred from the claim text.

User equipment reference signal-based timing estimation

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User equipment reference signal-based timing estimation

Life of this patent

Abstract

Claims28