METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING CONTROL INFORMATION IN A SINGLE CARRIER FDMA SYSTEM
First Claim
1. A method for transmitting control information in a Single Carrier-Frequency Division Multiple Access (SC-FDMA) system, the method comprising the steps of:
- generating first control information to be transmitted;
spreading control information symbols including the first control information by an orthogonal code that has a spreading factor according to a quantity of the first control information and that has a different index allocated to a User Equipment (UE) by a Node B;
performing a Discrete Fourier Transform (DFT) on the spread signal and mapping the Discrete Fourier Transformed signal to a first frequency region allocated for a transmission of the first control information, thereby generating a frequency domain signal;
mapping the frequency domain signal to SC-FDMA symbols through Inverse Fast Fourier Transform (IFFT); and
adding Cyclic Prefix (CP) for preventing inter-symbol interference to the SC-FDMA symbols and then transmitting a CP-added signal to the Node B.
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Accused Products
Abstract
Provided is a method and an apparatus for transmitting a large quantity of control information in a mobile communication system. When there is no uplink data to be transmitted, a UE spreads second control information, a quantity of which is less than or equal to a pre-defined threshold, by using a ZC sequence cyclic-shifted according to resource blocks, each of which indicates at least one time interval used for a transmission of the second control information. When there is uplink data to be transmitted, the UE performs TDM of the uplink data with third control information. When there is no uplink data to be transmitted and the quantity of control information exceeds a pre-defined threshold, or when the first control information includes various types of information, the UE spreads the first control information in a time domain by the orthogonal codes.
105 Citations
24 Claims
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1. A method for transmitting control information in a Single Carrier-Frequency Division Multiple Access (SC-FDMA) system, the method comprising the steps of:
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generating first control information to be transmitted; spreading control information symbols including the first control information by an orthogonal code that has a spreading factor according to a quantity of the first control information and that has a different index allocated to a User Equipment (UE) by a Node B; performing a Discrete Fourier Transform (DFT) on the spread signal and mapping the Discrete Fourier Transformed signal to a first frequency region allocated for a transmission of the first control information, thereby generating a frequency domain signal; mapping the frequency domain signal to SC-FDMA symbols through Inverse Fast Fourier Transform (IFFT); and adding Cyclic Prefix (CP) for preventing inter-symbol interference to the SC-FDMA symbols and then transmitting a CP-added signal to the Node B. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A User Equipment (UE) apparatus for transmitting control information in a Single Carrier-Frequency Division Multiple Access (SC-FDMA) system, the UE apparatus comprising:
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a control signal generator for spreading control information symbols including first control information to be transmitted by an orthogonal code that has a spreading factor according to a quantity of the first control information and has a different index allocated to a User Equipment (UE) by a Node B; a Discrete Fourier Transform (DFT) block for performing DFT on a spread signal; a mapper for mapping the Discrete Fourier Transformed signal to a first frequency region allocated for a transmission of the first control information, thereby generating a frequency domain signal; an Inverse Fast Fourier Transform (IFFT) block for mapping the frequency domain signal to SC-FDMA symbols through IFFT; and a Cyclic Prefix (CP) adder for adding CP for preventing inter-symbol interference to the SC-FDMA symbols and then transmitting a CP-added signal to the Node B. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for receiving control information in a Single Carrier-Frequency Division Multiple Access (SC-FDMA) system, the method comprising the steps of:
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extracting SC-FDMA symbols from a received signal by removing Cyclic Prefix (CP) for preventing inter-symbol interference from the received signal; performing a Fast Fourier Transform (FFT) on the SC-FDMA symbols; demapping a signal mapped to a first frequency region allocated for a transmission of first control information from a Fast Fourier Transformed signal; converting the demapped signal to a time domain signal through Inverse Fast Fourier Transform (IFFT); extracting a control channel signal by demultiplexing the time domain signal; and acquiring the first control information by despreading the control channel signal by an orthogonal code that has a spreading factor according to a quantity of the first control information and has a different index allocated to a User Equipment (UE). - View Dependent Claims (14, 15, 16, 17, 18)
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19. A Node B apparatus for receiving control information in a Single Carrier-Frequency Division Multiple Access (SC-FDMA) system, the Node B comprising:
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a Cyclic Prefix (CP) remover for extracting SC-FDMA symbols from a received signal by removing CP for preventing inter-symbol interference from the received signal; a Fast Fourier Transform (FFT) block performing an FFT on the SC-FDMA symbols; a demapper for demapping a signal mapped to a first frequency region allocated for a transmission of first control information from an Fast Fourier Transformed signal; an Inverse Fast Fourier Transform (IFFT) block for converting the demapped signal to a time domain signal through IFFT; a demultiplexer for extracting a control channel signal by demultiplexing the time domain signal; and a control channel signal receiver for acquiring the first control information by despreading the control channel signal by an orthogonal code that has a spreading factor according to a quantity of the first control information and has a different index allocated to a User Equipment (UE). - View Dependent Claims (20, 21, 22, 23, 24)
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Specification