Carrier aggregation
First Claim
Patent Images
1. Method for carrier aggregation of at least two Orthogonal Frequency Division Multiplexing (OFDM) carriers in a radio communication system, each of said at least two OFDM carriers comprising subcarriers being spaced in accordance with a subcarrier spacing of said radio communication system, respectively, the method comprising:
- allocating frequencies in a spectrum, such that the subcarriers of said at least two OFDM carriers are located separated from each other by a multiple of said subcarrier spacing, andsynchronizing transmission on said at least two OFDM carriers in time,wherein at least one of said at least two OFDM carriers is an extended legacy carrier being compatible with a legacy radio communication system, said extended legacy carrier being a legacy carrier of said legacy radio communication system, to which legacy carrier at least one additional subcarrier has been added;
wherein an aggregated carrier resulting from the carrier aggregation is used for downlink transmission in the radio communication system;
wherein said at least two OFDM carriers are transmitted from at least two different transmitters;
wherein, in a handover situation, said at least two OFDM carriers include at least one OFDM carrier being transmitted from a serving cell transmitter and at least one OFDM carrier being transmitted from a target cell transmitter.
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Abstract
Carrier aggregation in a radio communication system is disclosed, in which at least two Orthogonal Frequency Division Multiplexing (OFDM) carriers are aggregated, each of the at least two OFDM carriers comprising subcarriers being spaced in accordance with a subcarrier spacing of the radio communication system, transmission on the at least two OFDM carriers being synchronized in time.
14 Citations
14 Claims
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1. Method for carrier aggregation of at least two Orthogonal Frequency Division Multiplexing (OFDM) carriers in a radio communication system, each of said at least two OFDM carriers comprising subcarriers being spaced in accordance with a subcarrier spacing of said radio communication system, respectively, the method comprising:
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allocating frequencies in a spectrum, such that the subcarriers of said at least two OFDM carriers are located separated from each other by a multiple of said subcarrier spacing, and synchronizing transmission on said at least two OFDM carriers in time, wherein at least one of said at least two OFDM carriers is an extended legacy carrier being compatible with a legacy radio communication system, said extended legacy carrier being a legacy carrier of said legacy radio communication system, to which legacy carrier at least one additional subcarrier has been added; wherein an aggregated carrier resulting from the carrier aggregation is used for downlink transmission in the radio communication system; wherein said at least two OFDM carriers are transmitted from at least two different transmitters; wherein, in a handover situation, said at least two OFDM carriers include at least one OFDM carrier being transmitted from a serving cell transmitter and at least one OFDM carrier being transmitted from a target cell transmitter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Computer program product comprising a non-transitory computer readable medium, that when executed in a computer, provides computer instructions to:
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allocate frequencies in a spectrum, such that subcarriers of at least two Orthogonal Frequency Division Multiplexing (OFDM) carriers are located separated from each other by a multiple of a subcarrier spacing, and synchronize transmission on said at least two OFDM carriers in time, wherein at least one of said at least two OFDM carriers is an extended legacy carrier being compatible with a legacy radio communication system, said extended legacy carrier being a legacy carrier of said legacy radio communication system, to which legacy carrier at least one additional subcarrier has been added; wherein an aggregated carrier resulting from a carrier aggregation of said at least two OFDM carriers is used for downlink transmission in the radio communication system; wherein said at least two OFDM carriers are transmitted from at least two different transmitters; wherein, in a handover situation, said at least two OFDM carriers include at least one OFDM carrier being transmitted from a serving cell transmitter and at least one OFDM carrier being transmitted from a target cell transmitter.
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12. A transmitter in a radio communication system comprising a downlink transmitter, said downlink transmitter being arranged for assisting in carrier aggregation of at least two Orthogonal Frequency Division Multiplexing (OFDM) carriers, each of said at least two OFDM carriers comprising subcarriers being spaced in accordance with a subcarrier spacing of said radio communication system, respectively, said downlink transmitter comprising:
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an allocation entity, being arranged for assisting in allocation of frequencies in a spectrum, such that the subcarriers of said at least two OFDM carriers are located separated from each other by a multiple of said subcarrier spacing, and a synchronization entity, being arranged for assisting in synchronization of transmission on said at least two OFDM carriers in time, and a transmission entity, being arranged for assisting in transmission of said at least two OFDM carriers, wherein at least one of said at least two OFDM carriers is an extended legacy carrier being compatible with a legacy radio communication system, said extended legacy carrier being a legacy carrier of said legacy radio communication system, to which legacy carrier at least one additional subcarrier has been added; wherein an aggregated carrier resulting from the carrier aggregation is used for downlink transmission in the radio communication system; wherein said at least two OFDM carriers are from at least two different transmitters; wherein, in a handover situation, said at least two OFDM carriers include at least one OFDM carrier from a serving cell transmitter and at least one OFDM carrier from a target cell transmitter. - View Dependent Claims (13)
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14. A radio communication system operating with an aggregated carrier, said aggregated carrier being created by carrier aggregation of at least two Orthogonal Frequency Division Multiplexing (OFDM) carriers in the radio communication system, each of said at least two OFDM carriers comprising subcarriers being spaced in accordance with a subcarrier spacing of said radio communication system, respectively, comprising:
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an allocation entity, being arranged for assisting in allocation of frequencies in a spectrum, such that the subcarriers of said at least two OFDM carriers are located separated from each other by a multiple of said subcarrier spacing, and a synchronization entity, being arranged for assisting in synchronization of transmission on said at least two OFDM carriers in time, wherein at least one of said at least two OFDM carriers is an extended legacy carrier being compatible with a legacy radio communication system, said extended legacy carrier being a legacy carrier of said legacy radio communication system, to which legacy carrier at least one additional subcarrier has been added; wherein an aggregated carrier resulting from the carrier aggregation is used for downlink transmission in the radio communication system; wherein said at least two OFDM carriers are transmitted from at least two different transmitters; wherein, in a handover situation, said at least two OFDM carriers include at least one OFDM carrier being transmitted from a serving cell transmitter and at least one OFDM carrier being transmitted from a target cell transmitter.
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Specification