User equipments, base stations and methods
A user equipment (UE) is described that includes a PDCCH receiver configured to receive a PDCCH with a DCI format, the PDCCH scheduling a first physical uplink shared channel (PUSCH) in subframe n and a second PUSCH in subframe n+1, the DCI format including an information field for indicating that a starting position of the first PUSCH is later than an initial boundary of an initial symbol of the subframe n. The UE also includes a channel sensor configured to perform a first channel access before the first PUSCH. The UE further includes a PUSCH transmitter configured to transmit the first PUSCH and the second PUSCH, in a case when the first channel access is successful. The channel sensor is further configured to, in a case when the first channel access is not successful, perform a second channel access before the second PUSCH.
1. A user equipment (UE) comprising:
a physical downlink control channel (PDCCH) receiver configured to receive a PDCCH with a downlink control information (DCI) format, the PDCCH scheduling a first physical uplink shared channel (PUSCH) in subframe n and a second PUSCH in subframe n+1, wherein n is an integer, the DCI format including an information field for indicating that a starting position of the first PUSCH is later than an initial boundary of an initial symbol of the subframe n;
a channel sensor configured to perform a first channel access immediately before the first PUSCH; and
a PUSCH transmitter configured to transmit the first PUSCH and the second PUSCH, in a case when the first channel access is successful, wherein
the channel sensor is further configured to, in a case when the first channel access is not successful, perform a second channel access immediately before the second PUSCH,
the PUSCH transmitter is further configured to, in a case when the second channel access is successful, transmit the second PUSCH, and
a starting position of the second PUSCH is an initial boundary of an initial symbol of the subframe n+1.
2. The UE of claim 1 , wherein
an additional cyclic prefix signal is attached to the first PUSCH.
3. The UE of claim 1 , wherein
the first channel access and the second channel access are based on a same type of Listen Before Talk (LBT).
4. An evolved node B (eNB) that communicates with a terminal apparatus, the eNB comprising:
a physical downlink control channel (PDCCH) transmitter configured to transmit a PDCCH with a downlink control information (DCI) format, the PDCCH scheduling a first physical uplink shared channel (PUSCH) in subframe n and a second PUSCH in subframe n+1, wherein n is an integer, the DCI format including an information field for indicating that a starting position of the first PUSCH is later than an initial boundary of an initial symbol of the subframe n; and
a PUSCH receiver configured to attempt to receive the first PUSCH immediately after a first channel access performed by the terminal apparatus, wherein
the PUSCH receiver is further configured to, in a case when the first PUSCH is not received, attempt to receive the second PUSCH immediately after a second channel access performed by the terminal apparatus, and
a starting position of the second PUSCH is an initial boundary of an initial symbol of the subframe n+1.
5. The eNB of claim 4 , wherein
an additional cyclic prefix signal is attached to the first PUSCH.
6. The eNB of claim 4 , wherein
the first channel access and the second channel access are based on a same type of Listen Before Talk (LBT).
7. A method for a user equipment (UE), the method comprising:
receiving a physical downlink control channel (PDCCH) with a downlink control information (DCI) format, the PDCCH scheduling a first physical uplink shared channel (PUSCH) in subframe n and a second PUSCH in subframe n+1, wherein n is an integer, the DCI format including an information field for indicating that a starting position of the first PUSCH is later than an initial boundary of an initial symbol of the subframe n;
performing a first channel access immediately before the first PUSCH; and
transmitting the first PUSCH and the second PUSCH, in a case when the first channel access is successful, wherein
in a case when the first channel access is not successful, a second channel access is performed immediately before the second PUSCH,
in a case when the second channel access is successful, the second PUSCH is transmitted, and
a starting position of the second PUSCH is an initial boundary of an initial symbol of the subframe n+1.
8. The method of claim 7 , wherein
an additional cyclic prefix signal is attached to the first PUSCH.
9. The method of claim 7 , wherein
the first channel access and the second channel access are based on a same type of Listen Before Talk (LBT).
10. A method for an evolved node B (eNB) that communicates with a terminal apparatus, the method comprising:
transmitting a physical downlink control channel (PDCCH) with a downlink control information (DCI) format, the PDCCH scheduling a first physical uplink shared channel (PUSCH) in subframe n and a second PUSCH in subframe n+1, wherein n is an integer, the DCI format including an information field for indicating that a starting position of the first PUSCH is later than an initial boundary of an initial symbol of the subframe n; and
attempting to receive the first PUSCH immediately after a first channel access performed by the terminal apparatus, wherein
in a case when the first PUSCH is not received, the eNB attempts to receive the second PUSCH immediately after a second channel access performed by the terminal apparatus, and
a starting position of the second PUSCH is an initial boundary of an initial symbol of the subframe n+1.
11. The method of claim 10 , wherein
an additional cyclic prefix signal is attached to the first PUSCH.
12. The method of claim 10 , wherein
the first channel access and the second channel access are based on a same type of Listen Before Talk (LBT).