Communication apparatus and wireless communication method for semi persistent scheduling
Provided are an eNB, a UE and wireless communication methods. The eNB, in an embodiment, includes circuitry operative to fill a SPS activation/deactivation field in a DCI with a predetermined pattern of bits; and a transmitter operative to transmit the DCI to a first UE for the first UE to start periodically transmitting signals to a second UE or stop periodically transmitting signals to the second UE based on the SPS activation/deactivation field. The DCI is in a SPS format formed by adopting part or all bits of at least one field of DCI format 5 as the SPS activation/deactivation field, and information supposed to be transmitted in the at least one field is indicated with the assistance of or by RRC or MAC signaling.
1. A first communication apparatus, comprising:
a receiver operative to receive, from a second communication apparatus, a first downlink control information (DCI), the first DCI is generated by adding a new field to fields in a first DCI format, the new field being an activation or release field used for activation or release of Semi Persistent Scheduling (SPS), the fields in the first DCI format not being used for activation or release of SPS; and
a transmitter operative to transmit or terminates semi-persistently scheduled data to a third communication apparatus based on the new field,
wherein a second DCI is used for a communication between the first communication apparatus and the second communication apparatus,
wherein the second DCI, which is transmitted from the second communication apparatus to the first communication apparatus, does not include the new field and includes the fields in the first DCI format, and
wherein the first DCI and the second DCI are set to have a same size by using padding bits.
2. The first communication apparatus according to claim 1 , wherein the first DCI is used for a SPS communication between the first communication apparatus and the third communication apparatus.
3. The first communication apparatus according to claim 1 , wherein padding bits are added to the first DCI when a size of the first DCI format is less than a size of the second DCL.
4. The first communication apparatus according to claim 1 , wherein a cyclic redundancy check (CRC) of the first DCI is scrambled with a SPS specific radio network temporary identity (RNTI) for the first DCI.
5. The first communication apparatus according to claim 1 , wherein the first DCI includes a time resource field indicating a time resource from a subset determined by a radio resource control (RRC) signaling.
6. A first communication method for a first communication apparatus, the first communication method comprising:
receiving, from a second communication apparatus, a first downlink control information (DCI), the first DCI is generated by adding a new field to fields in a first DCI format, the new field being an activation or release field used for activation or release of Semi Persistent Scheduling (SPS), the fields in the first DCI format not being used for activation or release of SPS; and
transmitting or terminating semi-persistently scheduled data to a third communication apparatus based on the new field,
wherein a second DCI is used for a communication between the first communication apparatus and the second communication apparatus,
wherein the second DCI, which is transmitted from the second communication apparatus to the first communication apparatus, does not include the new field and includes the fields in the first DCI format, and
wherein the first DCI and the second DCI are set to have a same size by using padding bits.
7. The first communication method according to claim 6 , wherein the first DCI is used for a SPS communication between the first communication apparatus and the third communication apparatus.
8. The first communication method according to claim 6 , wherein padding bits are added to the first DCI when a size of the first DCI format is less than a size of the second DCI.
9. The first communication method according to claim 6 , wherein a cyclic redundancy check (CRC) of the first DCI is scrambled with a SPS specific radio network temporary identity (RNTI) for the first DCI format.
10. The first communication method according to claim 6 , wherein the first DCI includes a time resource field indicating a time resource from a subset determined by a radio resource control (RRC) signaling.
11. The first communication apparatus according to claim 1 , wherein the fields in a first DCI format are included in the first DCI.
12. The first communication apparatus according to claim 1 , wherein the second communication apparatus is a base station.