Control channel signaling using a common signaling field for transport format and redundancy version
New control signalling is associated to a protocol data unit conveying user data in a mobile communication system and to the control channel signal. A mobile station and a base station and their respective operation are described in view of the newly defined control channel signals. To reduce the control channel overhead, a common field is defined for the transport format and redundancy version in the control channel information format. According to one approach, the common field is used to jointly encode transport format and redundancy version therein. According to another aspect, one shared field is provided on the control channel signal that indicates either a transport format or a redundancy version depending on whether the control channel signal relates to an initial transmission or a retransmission. In another embodiment, further enhancements to an HARQ protocol address certain error cases.
1. A wireless terminal for use in a wireless communication system, the wireless terminal comprising:
a receiver for receiving a physical downlink control channel signal, and
a transmitter for physical uplink channel transmission,
wherein the physical downlink control channel signal is associated to the physical uplink channel transmission and includes a control information region having a number of bits encoding a transport block size and a redundancy version used for the physical uplink channel transmission,
wherein the bits of the control information region represent one value out of a range of values, and
wherein a first subset of the range of values is for determining the transport block size of the physical uplink channel transmission and a second subset of the range of values is for determining the redundancy version for the physical uplink channel transmission.
2. The wireless terminal according to claim 1 , wherein the first subset of the range of values contains more values than the second subset of the range of values.
3. The wireless terminal according to claim 1 , wherein in case of the control information field representing the first subset of the range of values, the redundancy version to be used for the initial transmission is a fixed or a preconfigured value.
4. The wireless terminal according to claim 3 , wherein the value of the fixed or preconfigured redundancy version is 0.
5. The wireless terminal according to claim 1 , wherein in case of the control information region representing the second subset of the range of values, the transport block size to be used for the retransmission is a transport block size of the initial transmission.
6. The wireless terminal according to claim 1 , wherein the transport block size is an index that is used for determining the actual transport block size.
7. The wireless terminal according to claim 1 , wherein the number of the values in the second subset of the range of values is 3.
8. The wireless terminal according to claim 1 , wherein the wireless terminal is a user equipment.
9. The wireless terminal according to claim 1 , wherein for an initial physical uplink channel transmission from the wireless terminal, the value of information bits in the control information region represents a value of the first subset values.
10. The wireless terminal according to claim 1 , wherein for a physical uplink channel retransmission from the wireless terminal, the value of the information bits in the control information region represents a value of the second subset values.
11. A method performed by a wireless terminal in a wireless communication system, the method comprising the steps of:
receiving a physical downlink control channel signal, and
transmitting a physical uplink channel signal,
wherein the physical downlink control channel signal is associated to the physical uplink channel signal and includes a control information region having a number of bits encoding a transport block size and a redundancy version used for the physical uplink channel signal,
wherein the bits of the control information field represent one value out of a range of values, and wherein a first subset of the range of values is for determining the transport block size of the physical uplink channel signal and a second subset of the range of values is for determining the redundancy version for the physical uplink channel signal.
12. The method according to claim 10 , wherein the first subset of the range of values contains more values than the second subset of the range of values.
13. The method according to claim 10 , wherein in case of the control information field representing the first subset of the range of values, the redundancy version to be used for the initial transmission is a fixed or a preconfigured value.
14. The method according to claim 13 , wherein the value of the fixed or preconfigured redundancy version is 0.
15. The method according to claim 10 , wherein in case of the control information field representing the second subset of the range of values, the transport block size to be used for the retransmission is a transport block size of the initial transmission.
16. The method according to claim 10 , wherein the transport block size is an index that is used for determining the actual transport block size.
17. The method according to claim 10 , wherein the number of the values in the second subset of the values is 3.
18. The method according to claim 10 , wherein the wireless terminal is a user equipment.
19. The method according to claim 10 , wherein for an initial physical uplink channel transmission from the wireless terminal, the value of information bits in the control information region represents a value of the first subset values.
20. The method according to claim 10 , wherein for a physical uplink channel retransmission from the wireless terminal, the value of the information bits in the control information region represents a value of the second subset values.