Radio communication system, base station apparatus and user terminal
First Claim
1. A radio communication system in which a first communication system and a second communication system are arranged in an overlapping manner, the radio communication system comprising:
- a base station apparatus communicating in the first and second communication systems; and
a user terminal communicating with the base station;
the first communication system adding or removing a frequency band to assign for communication between the base station apparatus and the user terminal on a per fundamental frequency block basis, and the second communication system performing communication between the base station apparatus and the user terminal via one fixed fundamental frequency block, wherein;
in the first communication system, one of fundamental frequency blocks assigned to the user terminal is determined as an anchor block, and the anchor block supports a same operation as in the second communication system;
the base station apparatus allocates resources such that a shared data channel for transmission of user data and downlink control information for demodulation of the shared data channel are mapped to the same or different fundamental frequency blocks;
the base station apparatus controls whether or not to add a carrier indicator of a fundamental frequency block to which the shared data channel is mapped to the downlink control information; and
the base station apparatus, in an anchor block, regardless of whether or not the carrier indicator exists, maps downlink control information, which is for demodulating the shared data channel mapped to the anchor block and to which the carrier indicator is not added, in a control channel region of the anchor block.
1 Assignment
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Accused Products
Abstract
The present invention maintains communication even during a transition period in which ON/OFF of the CIF is switched by higher layer signaling or during a transition period in which the number of component carrier aggregations is increased/decreased. In a radio communication system in which an LTE-A system, in which an LTE-A system to add or remove the frequency band to assign for communication between a base station apparatus (20) and a mobile terminal apparatus (10) on a per component carrier basis, and an LTE system to perform communication between the base station apparatus (20) and the mobile terminal apparatus (10) using one fixed fundamental frequency block, are arranged in an overlapping manner, in the LTE-A system, one of the fundamental frequency blocks assigned to the mobile terminal apparatus (10) is determined as an anchor block, and the anchor block supports the same operation as in the LTE system.
9 Citations
6 Claims
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1. A radio communication system in which a first communication system and a second communication system are arranged in an overlapping manner, the radio communication system comprising:
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a base station apparatus communicating in the first and second communication systems; and a user terminal communicating with the base station; the first communication system adding or removing a frequency band to assign for communication between the base station apparatus and the user terminal on a per fundamental frequency block basis, and the second communication system performing communication between the base station apparatus and the user terminal via one fixed fundamental frequency block, wherein; in the first communication system, one of fundamental frequency blocks assigned to the user terminal is determined as an anchor block, and the anchor block supports a same operation as in the second communication system; the base station apparatus allocates resources such that a shared data channel for transmission of user data and downlink control information for demodulation of the shared data channel are mapped to the same or different fundamental frequency blocks; the base station apparatus controls whether or not to add a carrier indicator of a fundamental frequency block to which the shared data channel is mapped to the downlink control information; and the base station apparatus, in an anchor block, regardless of whether or not the carrier indicator exists, maps downlink control information, which is for demodulating the shared data channel mapped to the anchor block and to which the carrier indicator is not added, in a control channel region of the anchor block. - View Dependent Claims (2)
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3. A base station apparatus in a radio communication system in which a first communication system and a second communication system are arranged in an overlapping manner, the first communication system adding or removing a frequency band to assign for communication between the base station apparatus and a user terminal on a per fundamental frequency block basis, and the second communication system performing communication between the base station apparatus and the user terminal via one fixed fundamental frequency block, the base station apparatus comprising:
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a section that allocates resources such that a shared data channel for transmission of user data and downlink control information for demodulation of the shared data channel are mapped to the same or different fundamental frequency blocks; a section that controls whether or not to add a carrier indicator of a fundamental frequency block to which the shared data channel is mapped to the downlink control information; and a section that, in an anchor block, regardless of whether or not the carrier indicator exists, maps downlink control information, which is for demodulating the shared data channel mapped to the anchor block and to which the carrier indicator is not added, in a control channel region of the anchor block, wherein, in the first communication system, one of fundamental frequency blocks assigned to the user terminal is determined as the anchor block, and the anchor block supports a same operation as in the second communication system.
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4. A user terminal in a radio communication system in which a first communication system and a second communication system are arranged in an overlapping manner, the first communication system adding or removing a frequency band to assign for communication between a base station apparatus and the user terminal on a per fundamental frequency block basis, and the second communication system performing communication between the base station apparatus and the user terminal via one fixed fundamental frequency block, the user terminal comprising:
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a receiving section that receives fundamental frequency blocks including an anchor block; and a section that demaps downlink control information of the anchor block, wherein one of the fundamental frequency blocks assigned by the base station apparatus is determined as the anchor block that supports a same operation as in the second communication system, and, in this anchor block, downlink reception processing is performed in accordance with the second communication system, in the first communication system, resources are allocated such that a shared data channel for transmission of user data and downlink control information for demodulation of the shared data channel are mapped to the same or different fundamental frequency blocks, and whether or not to add a carrier indicator of a fundamental frequency block to which the shared data channel is mapped to the downlink control information is controlled, and in the anchor block, downlink control information, which is for demodulating the shared data channel mapped to the anchor block and to which the carrier indicator is not added, is mapped in a control channel region of the anchor block.
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5. A radio communication system in which a first communication system and a second communication system are arranged in an overlapping manner, the radio communication system comprising:
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a base station apparatus communicating in the first and second communication systems; and a user terminal communicating with the base station, the first communication system adding or removing a frequency band to assign for communication between the base station apparatus and the user terminal on a per fundamental frequency block basis, and the second communication system performing communication between the base station apparatus and the user terminal via one fixed fundamental frequency block, wherein; in the first and second communication systems, a common search space that is common between user terminals and a user specific search space that is separate between user terminals are assigned to a downlink control channel region of the fundamental frequency block; and the base station apparatus; maps user common control information, which a plurality of user terminals connecting to a same cell, need to receive, to the common search space; maps user-specific control information, which each user terminal needs to receive individually, to the user-specific search space, in a configuration according to the first communication system; and furthermore, maps the user-specific control information, which each user terminal needs to receive individually, to the common search space, fixedly to the configuration which guarantees the same operation as in the second communication system. - View Dependent Claims (6)
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Specification