Method for receiving control information in orthogonal frequency division multiplexing system of mobile communication system
First Claim
1. A method of transmitting downlink channels at a base station of an orthogonal frequency division multiplexing (OFDM) system, the method comprising:
- transmitting first information indicating a size m of a first region through a broadcast channel, wherein the first region is defined by m OFDM symbol(s) starting from a beginning of a subframe and the first region is used for first channels that carry hybrid automatic repeat request (HARQ) ACK/NACKs;
transmitting second information indicating a size n of a second region through a physical control format indicator channel (PCFICH), wherein the second region is defined by n OFDM symbol(s) starting from the beginning of the subframe and the second region is used for second channels that carry downlink control information; and
transmitting the HARQ ACK/NACKs and the downlink control information through the first channels and second channels, respectively,wherein first resources for the first channels are identified from the first information, and second resources for the second channels are identified from remaining resources excluding the first resources within the second region, andwherein the second channels are physical downlink control channels (PDCCHs).
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Abstract
The present invention relates to receiving control information in an orthogonal frequency division multiplexing (OFDM) system of a mobile communication system. The present invention includes receiving information related to a number of OFDM symbols in a subframe for receiving first control information, receiving information related to a number of OFDM symbols in the subframe for receiving second control information, decoding the first control information according to the received information related to the number of OFDM symbols in the subframe for receiving the first control information, and decoding the second control information according to the received information related to the number of OFDM symbols in the subframe for receiving the second control information, wherein the number of OFDM symbols for receiving the first control information is less than or equal to the number of OFDM symbols for receiving the second control information.
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Citations
20 Claims
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1. A method of transmitting downlink channels at a base station of an orthogonal frequency division multiplexing (OFDM) system, the method comprising:
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transmitting first information indicating a size m of a first region through a broadcast channel, wherein the first region is defined by m OFDM symbol(s) starting from a beginning of a subframe and the first region is used for first channels that carry hybrid automatic repeat request (HARQ) ACK/NACKs; transmitting second information indicating a size n of a second region through a physical control format indicator channel (PCFICH), wherein the second region is defined by n OFDM symbol(s) starting from the beginning of the subframe and the second region is used for second channels that carry downlink control information; and transmitting the HARQ ACK/NACKs and the downlink control information through the first channels and second channels, respectively, wherein first resources for the first channels are identified from the first information, and second resources for the second channels are identified from remaining resources excluding the first resources within the second region, and wherein the second channels are physical downlink control channels (PDCCHs). - View Dependent Claims (2)
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3. A method of receiving downlink channels at a mobile terminal of an orthogonal frequency division multiplexing (OFDM) system, the method comprising:
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receiving first information indicating a size m of a first region through a broadcast channel, wherein the first region is defined by m OFDM symbol(s) starting from a beginning of a subframe and the first region is used for first channels that carry hybrid automatic repeat request (HARQ) ACK/NACKs; receiving second information indicating a size n of a second region through a physical control format indicator channel (PCFICH), wherein the second region is defined by n OFDM symbol(s) starting from the beginning of the subframe and the second region is used for second channels that carry downlink control information; and receiving the HARQ ACK/NACKs and the downlink control information through the first channels and second channels, respectively, wherein first resources for the first channels are identified from the first information, and second resources for the second channels are identified from remaining resources excluding the first resources within the second region, and wherein the second channels are physical downlink control channels (PDCCHs). - View Dependent Claims (4, 5)
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6. A base station used in an orthogonal frequency division multiplexing (OFDM) system, the base station comprising:
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a radio frequency unit; and a processor, wherein the processor is configured to; transmit first information indicating a size m of a first region through a broadcast channel, wherein the first region is defined by m OFDM symbol(s) starting from beginning of a subframe and the first region is used for first channels that carry hybrid automatic repeat request (HARQ) ACK/NACKs; transmit second information indicating a size n of a second region through a physical control format indicator channel (PCFICH), wherein the second region is defined by n OFDM symbol(s) starting from the beginning of the subframe and the second region is used for second channels that carry downlink control information; and transmit the HARQ ACK/NACKs and the downlink control information through the first channels and second channels, respectively, wherein first resources for the first channels are identified from the first information, and second resources for the second channels are identified from remaining resources excluding the first resources within the second region, and wherein the second channels are physical downlink control channels (PDCCHs). - View Dependent Claims (7)
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8. A mobile terminal used in an orthogonal frequency division multiplexing (OFDM) system, the mobile terminal comprising:
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a radio frequency unit; and a processor, wherein the processor is configured to;
receive first information indicating a size m of a first region through a broadcast channel, wherein the first region is defined by m OFDM symbol(s) starting from a beginning of a subframe and the first region is used for first channels that carry hybrid automatic repeat request (HARQ) ACK/NACKs;receive second information indicating a size n of a second region through a physical control format indicator channel (PCFICH), wherein the second region is defined by n OFDM symbol(s) starting from the beginning of the subframe and the second region is used for second channels that carry downlink control information; and receive the HARQ ACK/NACKs and the downlink control information through the first channels and second channels, respectively, wherein first resources for the first channels are identified from the first information, and second resources for the second channels are identified from remaining resources excluding the first resources within the second region, and wherein the second channels are physical downlink control channels (PDCCHs). - View Dependent Claims (9, 10)
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11. A method of receiving downlink signals at a mobile terminal in an orthogonal frequency division multiplexing (OFDM) system, the method comprising:
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decoding first control information to obtain a number m of OFDM symbols, wherein m OFDM symbols starting from a beginning of a subframe are used for reception of one or more acknowledgement/negative acknowledgement (ACK/NACK) channels; receiving second control information about a number n of OFDM symbols, wherein n OFDM symbols starting from the beginning of the subframe are used for reception of scheduling information, and wherein; each of n and m is an integer that is equal to or greater than 1; n is equal to or greater than m; a transmission time interval of the first control information is greater than a transmission time interval of the second control information; and if the number m is equal to an upper limit of n, then the number n is determined to be equal to the upper limit of n, regardless of the second control information; and decoding the scheduling information for the mobile terminal using the number n. - View Dependent Claims (12, 13, 17, 18)
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14. A mobile terminal used in an orthogonal frequency division multiplexing (OFDM) system, the mobile terminal comprising:
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a radio frequency unit; and a processor configured to cause the radio frequency unit to; decode first control information to obtain a number m of OFDM symbols, wherein m OFDM symbols starting from a beginning of a subframe are used for reception of one or more acknowledgement/negative acknowledgement (ACK/NACK) channels; receive second control information about a number n of OFDM symbols, wherein n OFDM symbols starting from the beginning of the subframe are used for reception of scheduling information, and wherein; each of n and m is an integer that is equal to or greater than 1; n is equal to or greater than m; a transmission time interval of the first control information is greater than a transmission time interval of the second control information; and if the number m is equal to an upper limit of n, then the number n is determined to be equal to the upper limit of n, regardless of the second control information; and decode the scheduling information for the mobile terminal using the number n. - View Dependent Claims (15, 16, 19, 20)
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Specification