Base station apparatus, terminal apparatus, and communication method for improving communication performance using multiple frame formats
Provided is a base station apparatus, a terminal apparatus, and a communication method, capable of improving communication performance such as throughput and communication efficiency in a system using a plurality of frame formats. A terminal apparatus according to the present invention, includes a reception unit to receive information indicating at least one frame structure out of a plurality of frame structures from the base station apparatus, a control unit to perform a transmit power control associated with the frame structure, and a transmission unit to generate a transmit signal based on the frame structure and the transmit power control and transmit the transmit signal to the base station apparatus.
1. A terminal apparatus for communicating with at least one base station apparatus, comprising:
reception circuitry configured to receive information indicating a plurality of numerologies out of a predetermined set of numerologies from the at least one base station apparatus;
control circuitry configured to perform transmit power control using a value set corresponding to one of the plurality of numerologies relating to at least one of a maximum allowable transmit power, an allocated radio resource amount, a target received power, a propagation loss estimate performed by the terminal apparatus, a coefficient for compensation of the propagation loss estimate, a modulation scheme, and an error in the transmit power control; and
transmission circuitry configured to generate a transmit signal based on the one of the plurality of numerologies and the transmit power control and transmit the transmit signal in a serving cell corresponding to one of the at least one base station apparatus,
wherein a radio resource amount allocated to the terminal apparatus is set based on a predetermined radio resource unit.
2. The terminal apparatus according to claim 1 , wherein
a target received power in the at least one base station apparatus includes a transmit power control related to an antenna gain of the at least one base station apparatus and the terminal apparatus, and
the transmit power control related to the antenna gain is set based on a reference antenna gain and an antenna gain of the at least one base station apparatus and the terminal apparatus.
3. The terminal apparatus according to claim 1 , wherein
the coefficient related to compensation for the propagation loss is capable of being set to a value exceeding 1 in a case that a predetermined numerology is set out of the plurality of numerologies.
4. The terminal apparatus according to claim 1 , wherein
the propagation loss between the at least one base station apparatus and the terminal apparatus includes a transmit power control related to an antenna gain of the base station apparatus and the terminal apparatus, and
the transmit power control related to the antenna gain is set based on a reference antenna gain and an antenna gain of the base station apparatus and the terminal apparatus.
5. The terminal apparatus according to claim 1 , wherein
the control circuitry is configured to further perform a transmit power control related to an antenna gain of the at least one base station apparatus and the terminal apparatus, and
the transmit power control related to the antenna gain is set based on a reference antenna gain and an antenna gain of the at least one base station apparatus and the terminal apparatus.
6. The terminal apparatus according to claim 1 , wherein
the control circuitry is configured to perform a transmit power control using a value set for a numerology in a case of the predetermined numerology.
7. The terminal apparatus according to claim 1 , wherein
the control circuitry is configured to calculate a transmit power based on at least control information notified from the at least one base station apparatus, and a configuration cycle of the control information is set for each of the plurality of numerologies.
8. The terminal apparatus according to claim 1 , wherein
information indicating a difference between the maximum allowable transmit power and the transmit power of the transmit signal is notified to the at least one base station apparatus.
9. The terminal apparatus according to claim 8 , wherein
a cycle of notifying the information indicating the difference to the the at least one base station apparatus is set for each of the plurality of numerologies.
10. A base station apparatus for communicating with a terminal apparatus,
the base station apparatus comprising transmission circuitry configured notify an instruction related to at least one of a plurality of numerologies and control information related to transmit power control of the terminal apparatus in a serving cell with transmit power parameter sets corresponding to different numerologies, wherein
the control information includes at least one of a maximum allowable transmit power of the terminal apparatus, an allocated radio resource amount to the terminal apparatus, a target received power in the base station apparatus of the terminal apparatus, a propagation loss estimate performed by the terminal apparatus, a coefficient for compensation of the propagation loss estimate, a modulation scheme of the terminal apparatus, and an error of the terminal apparatus in the transmit power control,
the at least one information included in the control information is set for each of the plurality of numerologies, and
the cycle in which the transmission circuitry is configured to notify the control information is determined based on the one of the plural number of numerologies associated with at least part of the information included in the control information.
11. A communication method of a terminal apparatus for communicating with a base station apparatus, comprising:
receiving information indicating a plurality of numerologies;
performing transmit power control using a value set corresponding to one of the plurality of numerologies relating to at least one of a maximum allowable transmit power, an allocated radio resource amount, a target received power in the base station apparatus, a propagation loss estimate performed by the terminal apparatus, a coefficient for compensation of the propagation loss estimate, a modulation scheme, and an error in the transmit power control;
generating a transmit signal based on the one of the plurality of numerologies and the transmit power control and transmitting the transmit signal in a serving cell with transmit power parameter sets corresponding to different numerologies,
wherein a radio resource amount allocated to the terminal apparatus is set based on a predetermined radio resource unit.
12. The terminal apparatus of claim 1 , wherein a numerology of the plurality of numerologies is related to at least one of subcarrier spacing, symbol duration, and cyclic prefix length.
13. The terminal apparatus of claim 1 , wherein each of the plurality of numerologies corresponds to a different set of radio resource units.
14. The terminal apparatus of claim 1 , wherein each of the plurality of numerologies corresponds to a different serving cell.
15. The terminal apparatus of claim 1 , further comprising:
performing another transmit power control using another value set corresponding to another one of the plurality of numerologies;
generating another transmit signal based on the another one of the plurality of numerologies and the another transmit power control, and transmit the another transmit signal.
16. The terminal apparatus of claim 15 , wherein the another transmit signal is transmitted in another service cell corresponding to the another one of the plural number of numerologies.
17. The terminal apparatus of claim 1 , wherein the plurality of numerologies is configured for the serving cell, and individual value sets for the transmit power control are configured for each of the plurality of numerologies.