RADIO COMMUNICATION SYSTEM, RADIO BASE STATION APPARATUS, USER TERMINAL AND COMMUNICATION CONTROL METHOD
First Claim
1. A radio communication system comprising a plurality of radio base station apparatuses that each form a cell, and a user terminal that connects with each radio base station apparatus through a radio link, wherein:
- the radio communication system supports a transmission mode, in which the plurality of radio base station apparatuses serve as transmission points and carry out CoMP transmission to the user terminal, a radio base station apparatus of a special cell transmits physical downlink control channels of multiple cells, and also all the radio base station apparatuses that carry out CoMP transmission transmit a physical downlink shared data channel of each cell;
the radio base station apparatus of the special cell comprises;
a generating section that, based on a table in which indices to represent individual coordinated cells that serve as transmission points in CoMP transmission and indices of CoMP sets to represent combinations of multiple cells that carry out joint transmission in CoMP transmission are mapped to bit data, generates downlink control information, in which the indices of CoMP sets are incorporated in a physical downlink control channel that is shared between the multiple cells that carry out joint transmission; and
a transmission section that transmits the physical downlink control channel of each cell, including the downlink control information generated; and
the user terminal comprises;
a receiving section that, when the transmission mode is applied, receives the physical downlink control channels of the multiple cells from the radio base station apparatus of the special cell, and also receives a physical downlink shared data channel from all the radio base station apparatuses that carry out coordinated multi-point transmission; and
a determining section that analyzes the indices of CoMP sets incorporated in the downlink control information included in the physical downlink control channels received, using a table of the same content as in the radio base station apparatus of the special cell, and specifies a CoMP set.
1 Assignment
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Accused Products
Abstract
The present invention is designed to realize signaling of cell index information that is suitable for CoMP transmission/reception techniques. The radio base station apparatus of a special cell generates downlink control information, in which the indices of CoMP sets are incorporated in a physical downlink control channel that is shared between the multiple cells that carry out joint transmission, based on a table in which indices to represent individual coordinated cells that serve as transmission points in CoMP transmission and indices of CoMP sets to represent combinations of multiple cells that carry out joint transmission in CoMP transmission are mapped to bit data.
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Citations
10 Claims
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1. A radio communication system comprising a plurality of radio base station apparatuses that each form a cell, and a user terminal that connects with each radio base station apparatus through a radio link, wherein:
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the radio communication system supports a transmission mode, in which the plurality of radio base station apparatuses serve as transmission points and carry out CoMP transmission to the user terminal, a radio base station apparatus of a special cell transmits physical downlink control channels of multiple cells, and also all the radio base station apparatuses that carry out CoMP transmission transmit a physical downlink shared data channel of each cell; the radio base station apparatus of the special cell comprises; a generating section that, based on a table in which indices to represent individual coordinated cells that serve as transmission points in CoMP transmission and indices of CoMP sets to represent combinations of multiple cells that carry out joint transmission in CoMP transmission are mapped to bit data, generates downlink control information, in which the indices of CoMP sets are incorporated in a physical downlink control channel that is shared between the multiple cells that carry out joint transmission; and a transmission section that transmits the physical downlink control channel of each cell, including the downlink control information generated; and the user terminal comprises; a receiving section that, when the transmission mode is applied, receives the physical downlink control channels of the multiple cells from the radio base station apparatus of the special cell, and also receives a physical downlink shared data channel from all the radio base station apparatuses that carry out coordinated multi-point transmission; and a determining section that analyzes the indices of CoMP sets incorporated in the downlink control information included in the physical downlink control channels received, using a table of the same content as in the radio base station apparatus of the special cell, and specifies a CoMP set. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A radio base station apparatus to which a user terminal connects through a radio link, the radio base station apparatus comprising:
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a scheduler that schedules CoMP transmission in which, with other radio base station apparatuses, the radio base station apparatus serves as a transmission point and carries out coordinated multi-point transmission to the user terminal; a generating section that, when, in CoMP transmission, physical downlink control channels of multiple cells are transmitted from a special cell, generates downlink control information, based on a table in which indices to represent individual coordinated cells that serve as transmission points and indices of CoMP sets to represent combinations of multiple cells that carry out joint transmission are mapped to bit data, where, in the downlink control information, the indices of CoMP sets are incorporated in a physical downlink control channel that is shared between the multiple cells that carry out joint transmission; and a transmission section that transmits the physical downlink control channel of each cell, including the downlink control information generated, from the special cell.
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8. A user terminal that connects with a plurality of radio base station apparatuses that each form a cell, through a radio link, the user terminal comprising:
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a receiving section that, when, in CoMP transmission in which the plurality of radio base station apparatuses carry out coordinated multi-point transmission, a special cell transmits physical downlink control channels of multiple cells, receives the physical downlink control channels of the multiple cells from the radio base station apparatus of the special cell, and also receives a physical downlink shared data channel from all the radio base station apparatuses that carry out coordinated multi-point transmission; and a detection section that analyzes the indices of coordinated cells or CoMP sets incorporated in the downlink control information included in the physical downlink control channel of each cell received, using a table that is prepared in advance, and specifies coordinated cells or a CoMP set, wherein, in the table, indices to represent individual coordinated cells that serve as transmission points in CoMP transmission and indices of CoMP sets to represent combinations of multiple cells that carry out joint transmission in CoMP transmission are mapped to bit data.
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9. A communication control method in a radio communication system comprising a plurality of radio base station apparatuses that each form a cell, and a user terminal that connects with each radio base station apparatus through a radio link, the communication control method comprising:
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scheduling CoMP transmission in which the plurality of radio base station apparatuses serve as transmission points and carry out coordinated multi-point transmission to the user terminal; and when, in CoMP transmission, physical downlink control channels of multiple cells are transmitted from a special cell, generating downlink control information, based on a table in which indices to represent individual coordinated cells that serve as transmission points and indices of CoMP sets to represent combinations of multiple cells that carry out joint transmission are mapped to bit data, where, in the downlink control information, the indices of CoMP sets are incorporated in a physical downlink control channel that is shared between the multiple cells that carry out joint transmission; and transmitting the physical downlink control channel of each cell, including the downlink control information generated, from the special cell.
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10. A communication control method in a radio communication system comprising a plurality of radio base station apparatuses that each form a cell, and a user terminal that connects with each radio base station apparatus through a radio link, the communication control method comprising:
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when, in CoMP transmission in which the plurality of radio base station apparatuses carry out coordinated multi-point transmission, a special cell transmits physical downlink control channels of multiple cells, receiving the physical downlink control channels of the multiple cells from the radio base station apparatus of the special cell, and also receiving a physical downlink shared data channel from all the radio base station apparatuses that carry out coordinated multi-point transmission; and analyzing the indices of coordinated cells or CoMP sets incorporated in the downlink control information included in the physical downlink control channel of each cell received, using a table that is prepared in advance, and specifying coordinated cells or a CoMP set, wherein, in the table, indices to represent individual coordinated cells that serve as transmission points in CoMP transmission and indices of CoMP sets to represent combinations of multiple cells that carry out joint transmission in CoMP transmission are mapped to bit data.
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Specification