Wireless communication with downlink control information having a semi persistent scheduling activation/deactivation field
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. An integrated circuit, which, in operation, controls a process performed by a first user equipment, the process comprising:
receiving, from a communication apparatus, a first downlink control information (DCI);
receiving, from the communication apparatus, a second DCI,
wherein the first DCI includes an activation or release field used for activation or release of Semi Persistent Scheduling (SPS) in addition to all fields of the second DCI, the first DCI being received by the first user equipment separately from the second DCI, the second DCI being used for a communication between the first user equipment and a second user equipment; and
transmitting semi-persistently scheduled data to the second user equipment based on the activation or release field, or terminating semi-persistently scheduled data to the second user equipment based on the activation or release field,
wherein the first DCI is set to a same size as a third DCI by using padding bits, the third DCI being used for a communication between the first user equipment and the communication apparatus.
2. The integrated circuit according to claim 1 , wherein a cyclic redundancy check (CRC) of the first DCI is scrambled with a Semi Persistent Scheduling (SPS) specific radio network temporary identity (RNTI).
3. The integrated circuit 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.
4. The integrated circuit according to claim 1 , wherein the communication apparatus is a base station.
5. A first user equipment, comprising:
a receiver, which, in operation, receives from a communication apparatus a first downlink control information (DCI), and receives from the communication apparatus a second DCI,
wherein the first DCI includes an activation or release field used for activation or release of Semi Persistent Scheduling (SPS) in addition to all fields of the second DCI, the first DCI being received by the first user equipment separately from the second DCI, the second DCI being used for a communication between the first user equipment and a second user equipment; and
a transmitter, which, in operation, transmits semi-persistently scheduled data to the second user equipment based on the activation or release field, or terminates semi-persistently scheduled data to the second user equipment based on the activation or release field,
wherein the first DCI is set to a same size as a third DCI by using padding bits, the third DCI being used for a communication between the first user equipment and the communication apparatus.
6. The first user equipment according to claim 5 , wherein a cyclic redundancy check (CRC) of the first DCI is scrambled with a Semi Persistent Scheduling (SPS) specific radio network temporary identity (RNTI).
7. The first user equipment according to claim 5 , wherein the first DCI includes a time resource field indicating a time resource from a subset determined by a radio resource control (RRC) signaling.
8. The first user equipment according to claim 5 , wherein the communication apparatus is a base station.
9. A communication method performed by a first user equipment, the communication method comprising:
receiving, from a communication apparatus, a first downlink control information (DCI);
receiving, from the communication apparatus, a second DCI,
wherein the first DCI includes an activation or release field used for activation or release of Semi Persistent Scheduling (SPS) in addition to all fields of the second DCI, the first DCI being received by the first user equipment separately from the second DCI, the second DCI being used for a communication between the first user equipment and a second user equipment; and
transmitting semi-persistently scheduled data to the second user equipment based on the activation or release field, or terminating semi-persistently scheduled data to the second user equipment based on the activation or release field,
wherein the first DCI is set to a same size as a third DCI by using padding bits, the third DCI being used for a communication between the first user equipment and the communication apparatus.
10. The communication method according to claim 9 , wherein a cyclic redundancy check (CRC) of the first DCI is scrambled with a Semi Persistent Scheduling (SPS) specific radio network temporary identity (RNTI).
11. The communication method according to claim 9 , wherein the first DCI includes a time resource field indicating a time resource from a subset determined by a radio resource control (RRC) signaling.
12. The communication method according to claim 9 , wherein the communication apparatus is a base station.