Aggregation of resources in enhanced control channels
First Claim
1. A method for transmitting downlink control information in a Long-Term Evolution (LTE) radio communication system, the method comprising:
- transmitting a first control message to a first user equipment (UE) in a first subframe and using a first Physical Resource Block (PRB) pair, wherein said first control message is divided among two or more first non-overlapping subsets of resource elements that are outside a Physical Downlink Control Channel (PDCCH) region of the subframe, at least one of which subsets is in the first PRB pair, wherein the two or more first non-overlapping subsets of resource elements are aggregated in a frequency-localized manner within at least the first PRB pair, and wherein symbols in the two or more first non-overlapping subsets of resource elements are transmitted using a single antenna port; and
transmitting a second control message to a second UE, also in the first subframe and also using the first PRB pair, wherein said second control message is divided among two or more second non-overlapping subsets of resource elements that are outside the PDCCH region of the subframe, at least one of which subsets is in the first PRB pair, wherein the two or more second non-overlapping subsets of resource elements are aggregated in a frequency-distributed manner across the first PRB pair and one or more additional PRB pairs, and wherein symbols in at least two of the two or more second non-overlapping subsets of resource elements are transmitted using differing antenna ports, said differing antenna ports including the single antenna port used to transmit the symbols in the two or more first non-overlapping subsets of resource elements.
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Abstract
Time-frequency resources in a single PRB pair are used for both frequency-localized transmissions as well as distributed transmissions. A first control message is transmitted to a first user equipment (UE) using a first PRB pair, using first subsets of resource elements that are aggregated in a frequency-localized manner and that are transmitted using a single antenna port. A second control message to a second UE is simultaneously transmitted), also using the first PRB pair, using second subsets of resources that are aggregated in a frequency-distributed manner across the first PRB pair and one or more additional PRB pairs and that are transmitted using at least two antenna ports, including the single antenna port used to transmit the symbols in the first non-overlapping subsets of resource elements.
13 Citations
18 Claims
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1. A method for transmitting downlink control information in a Long-Term Evolution (LTE) radio communication system, the method comprising:
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transmitting a first control message to a first user equipment (UE) in a first subframe and using a first Physical Resource Block (PRB) pair, wherein said first control message is divided among two or more first non-overlapping subsets of resource elements that are outside a Physical Downlink Control Channel (PDCCH) region of the subframe, at least one of which subsets is in the first PRB pair, wherein the two or more first non-overlapping subsets of resource elements are aggregated in a frequency-localized manner within at least the first PRB pair, and wherein symbols in the two or more first non-overlapping subsets of resource elements are transmitted using a single antenna port; and transmitting a second control message to a second UE, also in the first subframe and also using the first PRB pair, wherein said second control message is divided among two or more second non-overlapping subsets of resource elements that are outside the PDCCH region of the subframe, at least one of which subsets is in the first PRB pair, wherein the two or more second non-overlapping subsets of resource elements are aggregated in a frequency-distributed manner across the first PRB pair and one or more additional PRB pairs, and wherein symbols in at least two of the two or more second non-overlapping subsets of resource elements are transmitted using differing antenna ports, said differing antenna ports including the single antenna port used to transmit the symbols in the two or more first non-overlapping subsets of resource elements. - View Dependent Claims (2, 3, 4)
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5. A base station apparatus arranged to transmit downlink control information in a Long-Term Evolution (LTE) radio communication system, the base station apparatus comprising transmitter circuits and receiver circuits configured to receive and transmit radio signals over an air interface and further comprising one or more processing circuits, wherein the processing circuits are configured to:
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transmit a first control message to a first user equipment (UE) in a first subframe and using a first Physical Resource Block (PRB) pair, wherein said first control message is divided among two or more first non-overlapping subsets of resource elements that are outside a Physical Downlink Control Channel (PDCCH) region of the subframe, at least one of which subsets is in the first PRB pair, wherein the two or more first non-overlapping subsets of resource elements are aggregated in a frequency-localized manner within at least the first PRB pair, and wherein symbols in the two or more first non-overlapping subsets of resource elements are transmitted using a single antenna port; and transmit a second control message to a second UE, also in the first subframe and also using the first PRB pair, wherein said second control message is divided among two or more second non-overlapping subsets of resource elements that are outside the PDCCH region of the subframe, at least one of which subsets is in the first PRB pair, wherein the two or more second non-overlapping subsets of resource elements are aggregated in a frequency-distributed manner across the first PRB pair and one or more additional PRB pairs, and wherein symbols in at least two of the two or more second non-overlapping subsets of resource elements are transmitted using differing antenna ports, said differing antenna ports including the single antenna port used to transmit the symbols in the two or more first non-overlapping subsets of resource elements. - View Dependent Claims (6, 7, 8)
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9. A method in a user equipment (UE) for receiving downlink control information in a Long-Term Evolution (LTE) radio communication system, wherein the method comprises, for a first subframe:
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monitoring a first group of physical resource block (PRB) pairs, wherein said monitoring of the first group comprises forming each of two or more first candidate downlink control messages by aggregating two or more non-overlapping subsets of resources from the first group of PRB pairs in a frequency-localized manner and demodulating each first candidate downlink control message using reference symbols corresponding to a single antenna port, wherein the two or more non-overlapping subsets of resources from the first group of PRB pairs are outside a Physical Downlink Control Channel (PDCCH) region of the subframe; and monitoring a second group of PRB pairs, wherein said monitoring of the second group comprises forming each of two or more second candidate downlink control messages by aggregating two or more non-overlapping subsets of resources from the second group of PRB pairs in a distributed manner and demodulating each second candidate downlink control message using reference symbols corresponding to at least two antenna ports, wherein the two or more non-overlapping subsets of resources from the second group of PRB pairs are outside the PDCCH region of the subframe. - View Dependent Claims (10, 11, 12, 13)
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14. A user equipment apparatus arranged to receive downlink control information in a Long-Term Evolution (LTE) radio communication system, the user equipment apparatus comprising transmitter circuits and receiver circuits configured to receive and transmit radio signals over an air interface and further comprising one or more processing circuits, wherein the processing circuits are configured to, for a first subframe:
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monitor a first group of physical resource block (PRB) pairs, such that said monitoring of the first group comprises forming each of two or more first candidate downlink control messages by aggregating two or more non-overlapping subsets of resources from the first group of PRB pairs in a frequency-localized manner and demodulating each first candidate downlink control message using reference symbols corresponding to a single antenna port, wherein the two or more non-overlapping subsets of resources from the first group of PRB pairs are outside a Physical Downlink Control Channel (PDCCH) region of the subframe; and monitor a second group of PRB pairs, such that said monitoring of the second group comprises forming each of two or more second candidate downlink control messages by aggregating two or more non-overlapping subsets of resources from the second group of PRB pairs in a distributed manner and demodulating each second candidate downlink control message using reference symbols corresponding to at least two antenna ports, wherein the two or more non-overlapping subsets of resources from the second group of PRB pairs are outside the PDCCH region of the subframe. - View Dependent Claims (15, 16, 17, 18)
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Specification