Radio communication terminal, base station apparatus, radio communication system and radio communication method

1. A radio communication terminal that performs machine communication via a base station apparatus of a radio communication system that is operated such that a frequency becomes a first band at a maximum, depending on performance which a communication device supports, the radio communication terminal comprising:

a receiving section that has receiving performance to be able to support the first band, and that decodes an entire band of the first band at least with respect to a time domain where a downlink control channel is allocated; and

a transmission section that has transmission performance to be able to support a second band having a narrower bandwidth than the first band, and that allocates an uplink control channel and an uplink data channel to the second band,

wherein

the receiving section receives downlink control information and uplink control information that are transmitted together from the base station apparatus, and

in the downlink control information and the uplink control information, information bits for identifying between uplink and downlink are subtracted.

2. The radio communication terminal according to claim 1 , wherein

the receiving section receives the uplink control information via a downlink control channel,

the uplink control information represents uplink resource allocation, and

the transmission section determines frequency resources for the second band based on the uplink resource allocation represented by the uplink control information.

3. The radio communication terminal according to claim 1 , wherein

the receiving section receives the uplink control information via a downlink control channel,

the uplink control information is made compact by reducing information bits to designate an uplink modulation scheme, and

the transmission section modulates an uplink transmission signal in accordance with an uplink modulation scheme that is fixed in advance.

4. The radio communication terminal according to claim 1 , wherein

the receiving section receives the uplink control information via a downlink control channel,

the uplink control information includes a resource block index representing a top of the second band and is made compact by reducing information bits to designate a size of the second band, and

the transmission section determines frequency resources for the second band from the resource block index that is reported in the uplink control information and the size of the second band that is fixed in advance.

5. The radio communication terminal according to claim 1 , wherein the transmission section determines frequency resources for the second band from a resource block index that represents a top of the second band, and a size of the second band that is fixed in advance, that are reported from the base station apparatus by higher layer signaling.

6. The radio communication terminal according to claim 1 ,

wherein the receiving section receives the uplink control information via a downlink control channel, and

the uplink control information is made compact by reducing information bit for uplink resource allocation.

7. The radio communication terminal according to claim 1 , wherein the receiving section receives a data channel allocated to a limited band within the first band, and decodes the limited band in the first band with respect to a time domain where a data channel is allocated.

8. The radio communication terminal according to claim 1 , wherein one set of information bits for CRC (Cyclic Redundancy Check) is assigned over an entire of the downlink control information and the uplink control information that are transmitted together from the base station apparatus.

9. A base station apparatus that performs machine communication with a radio communication terminal in a radio communication system that is operated such that a frequency becomes a first band at a maximum, depending on performance which a communication device supports, the base station apparatus comprising:

an allocation section that allocates a second band having a narrower bandwidth than the first band to uplink for the radio communication terminal;

a transmission section that transmits downlink control information and uplink control information together on a downlink where the first band is allocated, the uplink control information including uplink resource allocation information assigned to the uplink for the radio communication terminal; and

a receiving section that receives an uplink transmission signal from the communication device in the first band, and receives an uplink transmission signal from the radio communication terminal in the second band,

wherein, in the downlink control information and the uplink control information, information bits for identifying between uplink and downlink are subtracted.

10. The base station apparatus according to claim 9 , wherein the transmission section transmits the uplink control information including the uplink resource allocation information via a downlink control channel.

11. The base station apparatus according to claim 9 , wherein the transmission section transmits the uplink resource allocation information with higher layer signaling.

12. A radio communication system that is operated such that a frequency becomes a first band at a maximum, depending on performance which a communication device supports, and the radio communication system comprising:

a base station apparatus; and

a radio communication terminal that performs machine communication via the base station apparatus, wherein

the base station apparatus includes:

a transmission section that transmits downlink control information and uplink control information together to the radio communication terminal, the uplink control information including radio resource allocation information representing resource allocation of an uplink of a second band having a narrow bandwidth than the first band; and

a receiving section that receives an uplink transmission signal from the communication device in the first band, and receives an uplink transmission signal from the radio communication terminal in the second band, and

the radio communication terminal includes:

a receiving section that has receiving performance to be able to support the first band, that decodes an entire band of the first band at least with respect to a time domain where a downlink control channel is allocated, and that receives downlink control information and uplink control information that are transmitted together from the base station apparatus; and

a transmission section that has transmission performance to be able to support the second band, and that allocates an uplink control channel and an uplink data channel to the second band, wherein

in the downlink control information and the uplink control information, information bits for identifying between uplink and downlink are subtracted.

13. A radio communication method of a radio communication terminal to perform machine communication via a base station apparatus of a radio communication system that is operated such that a frequency becomes a first band at a maximum, depending on performance which a communication device supports, wherein:

the radio communication terminal has receiving performance to be able to support the first band, and has transmission performance to be able to support a second band having a narrower bandwidth than the first band; and

the radio communication method comprising the steps of:

decoding an entire band of the first band at least with respect to a time domain where a downlink control channel is allocated;

allocating and transmitting an uplink control channel and an uplink data channel in the second band; and

receiving downlink control information and uplink control information that are transmitted together from the base station apparatus, wherein

in the downlink control information and the uplink control information, information bits for identifying between uplink and downlink are subtracted.

14. A radio communication method for performing machine communication in a base station apparatus of a radio communication system that is operated such that a frequency becomes a first band at a maximum, depending on performance which a communication device supports, with a radio communication terminal, the radio communication method comprising the steps of:

allocating a second band having a narrower bandwidth than the first band to uplink for the radio communication terminal;

transmitting downlink control information and uplink control information together on a downlink where the first band is allocated, the uplink control information including uplink resource allocation assigned to the uplink for the radio communication terminal; and

receiving an uplink transmission signal from the communication device in the first band, and receiving an uplink transmission signal from the radio communication terminal in the second band,

wherein, in the downlink control information and the uplink control information, information bits for identifying between uplink and downlink are subtracted.