Abstract
To provide a base station apparatus a terminal apparatus and a communication method capable of cell search with an accuracy meeting a required condition for each of the radio parameter sets. There are provided a radio reception unit configured to receive downlink signals in a frequency band the frequency band being constituted by a region of a first radio parameter set and a region of a second radio parameter having a subcarrier spacing different from that of the first radio parameter set and a synchronization detecting unit configured to establish synchronization with the base station apparatus in the frequency band. A synchronization signal sequence of the first radio parameter set is mapped to the region of the first radio parameter set and a synchronization signal sequence of the second radio parameter set is mapped to the region of the second radio parameter set. The synchronization detecting unit detects synchronization with the base station apparatus in the frequency band by using the synchronization signal sequence of the first radio parameter set and the synchronization signal sequence of the second radio parameter set.
| Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | |||||
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| Declaration Date | Declaration Reference | Declaring Company | Specification Information | ||||||
| 5G | 27/08/2020 | ISLD-202008-013 | SHARP CORPORATION |
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Specification Information
Specification Information
Technologies
Family Information
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| Publication No | Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | |||||
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| JP2018207137A | 5G | 27/08/2020 | ISLD-202008-013 | SHARP CORPORATION |
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| WO2017077771A1 | 5G | 27/08/2020 | ISLD-202008-013 | SHARP CORPORATION |
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| Publication No | Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | Status | National Phase Entries | |||||
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Technologies
Resource configuration
Product
Use Cases
Wireless communication
Services
Claim
1. A terminal apparatus for performing OFDM communication with a base station apparatus, the terminal apparatus comprising:
a radio reception unit configured to receive downlink signals in a frequency band, the frequency band being constituted by a region of a first radio parameter set and a region of a second radio parameter having a subcarrier spacing different from a subcarrier spacing of the first radio parameter set; and a synchronization detecting unit configured to establish synchronization with the base station apparatus in the frequency band, wherein a synchronization signal sequence of the first radio parameter set is mapped to the region of the first radio parameter set, and a synchronization signal sequence of the second radio parameter set is mapped to the region of the second radio parameter set, and the synchronization detecting unit detects synchronization with the base station apparatus in the frequency band by using the synchronization signal sequence of the first radio parameter set and the synchronization signal sequence of the second radio parameter set.
2. The terminal apparatus according to claim 1, wherein
in a case that the synchronization detecting unit establishes synchronization by using the synchronization signal sequence of the first radio parameter set, the radio reception unit receives information on a synchronization signal sequence of the second parameter set included in the downlink signals mapped to the region of the first radio parameter set, and the synchronization detecting unit detects synchronization in the region of the second parameter set by using the information on the synchronization signal sequence of the second parameter set.
3. The terminal apparatus according to claim 1, wherein
in a case that the synchronization detecting unit establishes synchronization by using the synchronization signal sequence of the first radio parameter set, the radio reception unit uses the synchronization established by using the synchronization signal sequence of the first radio parameter set to receive downlink signals transmitted by the base station apparatus, in the region of the first radio parameter set and the region of the second radio parameter set.
4. The terminal apparatus according to claim 1, wherein
the synchronization signal sequence of the second radio parameter set is a sequence obtained by combining synchronization signal sequences of multiple first radio parameter sets, and the synchronization signal sequence of each of the first radio parameter sets constituting a synchronization signal of the second radio parameter set is any sequence of multiple synchronization signal sequence candidates, and the synchronization detecting unit detects a cell ID of the second radio parameter set from a series of synchronization signal sequences obtained by combining the synchronization signal sequences of the multiple first radio parameter sets.
5. The terminal apparatus according to claim 1, wherein
in a case that the subcarrier spacing of the first radio parameter set is a times the subcarrier spacing of the second radio parameter set, the synchronization detecting unit detects synchronization in the region of the second radio parameter set by using the number of OFDM symbols which is a times the number of OFDM symbols that the synchronization signal sequence of the first radio parameter set is mapped.
6. The terminal apparatus according claim 1, wherein
the synchronization detecting unit uses the number of subcarriers that is the same as the number of subcarriers used to detect synchronization in the region of the first radio parameter set to detect synchronization in the region of the second radio parameter set.
7. The terminal apparatus according to claim 1, wherein
each of the first radio parameter set and the second radio parameter set is one radio access technology.
8. A communication method of a terminal apparatus for performing OFDM communication with a base station apparatus, the communication method comprising the steps of:
receiving downlink signals in a frequency band, the frequency band being constituted by a region of a first radio parameter set and a region of a second radio parameter set having a subcarrier spacing different from a subcarrier spacing of the first radio parameter set; and establishing synchronization with the base station apparatus in the frequency band, wherein a synchronization signal sequence of the first radio parameter set is mapped to the region of the first radio parameter set, and a synchronization signal sequence of the second radio parameter set is mapped to the region of the second radio parameter set, and the detecting detects synchronization with the base station apparatus in the frequency band by using the synchronization signal sequence of the first radio parameter set and the synchronization signal sequence of the second radio parameter set.
9. A base station apparatus for performing OFDM communication with a terminal apparatus, the base station apparatus comprising:
a synchronization signal generation unit configured to generate a synchronization signal sequence of a first radio parameter set and a synchronization signal sequence of a second radio parameter set; a multiplexing unit configured to, in a frequency band constituted by a region of the first radio parameter set and a region of the second radio parameter set having a subcarrier spacing different from a subcarrier spacing of the first radio parameter set, map the synchronization signal sequence of the first radio parameter set to the region of the first radio parameter set and map the synchronization signal sequence of the second radio parameter set to the region of the second radio parameter set; a radio transmission unit configured to transmit the synchronization signal sequence of the first radio parameter set and the synchronization signal sequence of the second radio parameter set to the terminal apparatus; and a radio reception unit configured to receive an uplink signal from the terminal apparatus, wherein in a case that the radio reception unit receives information indicating that synchronization is established in any radio parameter set, the radio transmission unit transmits information on a synchronization signal sequence of other radio parameter set than the radio parameter set specified by the information indicating that the synchronization is established.
10. A base station apparatus for performing OFDM communication with a terminal apparatus, the base station apparatus comprising:
a synchronization signal generation unit configured to generate a synchronization signal sequence of a first radio parameter set and a synchronization signal sequence of a second radio parameter set; a multiplexing unit configured to, in a frequency band constituted by a region of the first radio parameter set and a region of the second radio parameter set having a subcarrier spacing different from a subcarrier spacing of the first radio parameter set, map the synchronization signal sequence of the first radio parameter set to the region of the first radio parameter set and map the synchronization signal sequence of the second radio parameter set to the region of the second radio parameter set; and a radio transmission unit configured to transmit the synchronization signal sequence of the first radio parameter set and the synchronization signal sequence of the second radio parameter set to the terminal apparatus, wherein the number of OFDM symbols that the synchronization signal sequence of the second radio parameter set is mapped by the multiplexing unit is configured to be more than the number of OFDM symbols that the synchronization signal sequence of the first radio parameter set is mapped.
11. The base station apparatus according to claim 10, wherein
in a case that the subcarrier spacing of the first radio parameter set is a times the subcarrier spacing of the second radio parameter set, the number of OFDM symbols that the synchronization signal sequence of the second radio parameter set is mapped is a times the number of OFDM symbols that the synchronization signal sequence of the first radio parameter set is mapped.
12. The base station apparatus according to claim 10, wherein
the number of subcarriers that the synchronization signal sequence of the first radio parameter set is mapped is the same as the number of subcarriers that the synchronization signal sequence of the second radio parameter set is mapped.
13. The base station apparatus according to claim 12, wherein
the number of subcarriers that the first radio parameter set is mapped is the same as the number of subcarriers constituting a system band of the second radio parameter set.
14. The base station apparatus according to claim 10, wherein
a frequency bandwidth that a synchronization signal of the first radio parameter set is mapped is the same as a frequency bandwidth that a synchronization signal of the second radio parameter set is mapped.
15. The base station apparatus according to claim 10, wherein
the synchronization signal generation unit generates the synchronization signal sequence of the second radio parameter set by combining synchronization signal sequences of multiple first radio parameter sets, and each of the synchronization signal sequences of the first radio parameter sets constituting the synchronization signal of the second radio parameter set is a synchronization signal sequence selected from multiple synchronization signal sequence candidates.
16. A communication method of a base station apparatus for performing OFDM communication with a terminal apparatus, the communication method comprising the steps of:
generating a synchronization signal sequence of a first radio parameter set and a synchronization signal sequence of a second radio parameter set; in a frequency band constituted by a region of the first radio parameter set and a region of the second radio parameter set having a subcarrier spacing different from a subcarrier spacing of the first radio parameter set, mapping the synchronization signal sequence of the first radio parameter set to the region of the first radio parameter set and mapping the synchronization signal sequence of the second radio parameter set to the region of the second radio parameter set; transmitting the synchronization signal sequence of the first radio parameter set and the synchronization signal sequence of the second radio parameter set to the terminal apparatus; and receiving an uplink signal from the terminal apparatus, wherein in a case that the receiving receives information indicating that synchronization is established in any radio parameter set, the transmitting transmits information on a synchronization signal sequence of other radio parameter set than the radio parameter set specified by the information indicating that the synchronization is established.
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