Channel estimation for synchronized cells in a cellular communication system
First Claim
1. A method of performing channel estimation at user equipment operating in a mobile communications system, the method comprising:
- receiving a signal;
analyzing the signal to detect a signal component from a neighboring cell;
determining, in any order, one or both of the following;
whether a power level of the signal component from the neighboring cell exceeds a power threshold level; and
whether a difference between a timing parameter of the signal component from the neighboring cell and a timing parameter of a signal component from a serving cell is less than a timing threshold level;
if it is true that both the power level of the signal component from the neighboring cell exceeds the power threshold level and the difference between the timing parameter of the signal component from the neighboring cell and the timing parameter of the signal component from the serving cell is less than the timing threshold level, then performing a joint channel estimation process, and otherwise performing a single channel estimation process,wherein;
the received signal is generated by an orthogonal frequency division multiplexing process, and includes one or more symbols, each including a cyclic prefix; and
the joint channel estimation process is at least in part a function of the difference between the timing parameter of the signal component from the neighboring cell and the timing parameter of the signal component from the serving cell.
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Abstract
Channel estimation is performed by user equipment operating in a mobile communications system. Estimation involves receiving a signal and analyzing it to detect a signal component from a neighboring cell. Depending on outcome, one or both of the following are determined: whether a power level of the signal component from the neighboring cell exceeds a power threshold level; and whether a difference between timing parameters of the neighboring cell'"'"'s signal component and that from a serving cell is less than a timing threshold level. If the power level of the neighboring cell'"'"'s signal component exceeds the power threshold level and the difference between the timing parameters of the signal components from the neighboring cell and that of the serving cell is less than the timing threshold level, then a joint channel estimation process is performed. Otherwise, a single channel estimation process is performed.
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Citations
8 Claims
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1. A method of performing channel estimation at user equipment operating in a mobile communications system, the method comprising:
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receiving a signal; analyzing the signal to detect a signal component from a neighboring cell; determining, in any order, one or both of the following; whether a power level of the signal component from the neighboring cell exceeds a power threshold level; and whether a difference between a timing parameter of the signal component from the neighboring cell and a timing parameter of a signal component from a serving cell is less than a timing threshold level; if it is true that both the power level of the signal component from the neighboring cell exceeds the power threshold level and the difference between the timing parameter of the signal component from the neighboring cell and the timing parameter of the signal component from the serving cell is less than the timing threshold level, then performing a joint channel estimation process, and otherwise performing a single channel estimation process, wherein; the received signal is generated by an orthogonal frequency division multiplexing process, and includes one or more symbols, each including a cyclic prefix; and the joint channel estimation process is at least in part a function of the difference between the timing parameter of the signal component from the neighboring cell and the timing parameter of the signal component from the serving cell. - View Dependent Claims (2, 3, 7)
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4. An apparatus for performing channel estimation at user equipment operating in a mobile communications system, the apparatus comprising:
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logic circuitry adapted to receive a signal; logic circuitry adapted to analyze the signal to detect a signal component from a neighboring cell; logic circuitry adapted to determine, in any order, one or both of the following; whether a power level of the signal component from the neighboring cell exceeds a power threshold level; and whether a difference between a timing parameter of the signal component from the neighboring cell and a timing parameter of a signal component from a serving cell is less than a timing threshold level; logic circuitry adapted to perform a joint channel estimation process only if it is true that both the power level of the signal component from the neighboring cell exceeds the power threshold level and the difference between the timing parameter of the signal component from the neighboring cell and the timing parameter of the signal component from the serving cell is less than the timing threshold, and otherwise to perform a single channel estimation process, wherein; the received signal is generated by an orthogonal frequency division multiplexing process, and includes one or more symbols, each including a cyclic prefix; and the joint channel estimation process is at least in part a function of the difference between the timing parameter of the signal component from the neighboring cell and the timing parameter of the signal component from the serving cell. - View Dependent Claims (5, 6, 8)
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Specification