Control Signalling in Carrier Aggregation System
There is provided a timing entity for a communication network which includes a base station and a user equipment capable of communicating with each other over at least two carriers which have different temporal configuration of its uplink and downlink resources. The timing entity includes a control entity adapted for determining timing data defining a timing of a control signalling transmission which is related to a data transmission on a first carrier and which uses a resource of a first type on the second carrier. According to an embodiment the timing data specify for the control signalling transmission a time slot in which there is available a resource of the first type on the second carrier for the control signalling transmission. The control entity may be implemented in a base station and/or a user equipment.
1 . Timing entity of a communication network including a base station and a user equipment capable of communicating with each other over at least two carriers, the at least two carriers including a first carrier and a second carrier, both having uplink and downlink resources, the first carrier and the second carrier having different temporal configuration of its uplink and downlink resources, the timing entity comprising:
a control entity adapted for determining timing data defining a timing of a control signalling transmission being related to a data transmission on the first carrier;
the control signalling transmission using a resource of a first type on the second carrier, wherein the resource of the first type is either an uplink resource or a downlink resource; and
the timing data specifying for the control signalling transmission a time slot in which there is available a resource of the first type on the second carrier for the control signalling transmission.
2 . Timing entity according to claim 1 ,
the data transmission occurring in a first time slot; and
the timing data specifying for the control signalling transmission a second time slot;
the second time slot being spaced by a temporal distance from the first time slot;
the temporal distance being greater than or equal to a maximum time duration required for signalling between the base station and the user equipment while the second time slot is the temporally closest time slot providing a resource of the first type required for the control signalling transmission.
3 . Timing entity according to claim 1 , wherein
the data transmission is an uplink data transmission on the first carrier occurring in a first, time slot; and
the control signalling transmission is an uplink grant signalling transmission;
the timing data specifying for the uplink grant signalling transmission a second time slot tg=n−k1, wherein k1 is the smallest number of time slots which
spaces the second time slot from the first time slot by a time duration greater than or equal to a maximum time duration required for signalling between the base station and the user equipment; and
ensures the second time slot providing a downlink resource on the second carrier.
4 . Timing entity according to claim 1 wherein
the data transmission is an uplink data transmission on the first carrier occurring in a first time slot n; and
the control signalling transmission is an acknowledgement/non-acknowledgement signalling transmission;
the timing data specifying for the acknowledgement/non-acknowledgement signalling transmission a second time slot ta=n+k2, wherein k2 is the smallest number of time slots which
spaces the second time slot from the first time slot by a time duration greater than or equal to a maximum time duration required for signalling between the base station and the user equipment; and
ensures the second time slot providing a downlink resource on the second carrier.
5 . Timing entity according to claim 1 , wherein
the data transmission is an downlink data transmission on the first carrier occurring in a first time slot; and
the control signalling transmission is a downlink assignment signalling transmission;
the timing data specifying for the downlink assignment signalling transmission a second time slot which is the latest time slot before the first time slot that provides a downlink resource on the second carrier.
6 . Timing entity according to claim 1 wherein
the data transmission is a downlink data transmission on the first carrier occurring in a first time slot; and
the control signalling transmission is an acknowledgement/non-acknowledgement signalling transmission;
the timing data specifying for the acknowledgement/non-acknowledgement signalling transmission a second time slot to =n+k2, wherein k2 is the smallest number of time slots which
spaces the second time slot from the first time slot by a time duration greater than or equal to a maximum time duration required for signalling between the base station and the user equipment and o ensures the second time slot providing an uplink resource on the second carrier.
7 . Base station of a communication network, the base station comprising:
a timing entity according to claim 1 ; and
a controller for transmitting and receiving the control signalling transmission according to the timing data.
8 . Base station according to claim 7 ,
wherein optionally the controller
either is configured for providing the timing data to the user equipment or
is configured for providing the configuration indicating data to the user equipment.
9 . User equipment for a communication network, the user equipment comprising:
a timing entity according to claim 1 ;
the user equipment comprising a controller for transmitting and receiving the control signalling transmission according to the timing data;
wherein the controller is further configured for receiving the configuration indicating data from the base station.
10 . User equipment of a communication network, the communication network further including a base station, the user equipment and the base station being capable of communicating with each other over at least two carriers, the at least two carriers including a first carrier and a second carrier, both having uplink and downlink resources, the first carrier and the second carrier having different temporal configuration of its uplink and downlink resources, the user equipment comprising:
a controller being adapted for receiving timing data from the base station, the timing data defining a timing of a control signalling transmission being related to a data transmission on the first carrier; the controller being adapted for adjusting, depending on the timing data, the timing of the control signaling transmission by specifying a time slot in which there is available a resource of a first type on the second carrier for the control signaling transmission; and
the resource of the first type being either an uplink resource or a downlink resource.
11 . Method of operating a timing entity of a communication network including a base station and a user equipment capable of communicating with each other over at least two carriers the at least two carriers including a first carrier and a second carrier, both having uplink and downlink resources, the first carrier and the second carrier having different temporal configuration of its uplink and downlink resources, the method comprising:
determining timing data defining a timing of a control signalling transmission being related to a data transmission on the first carrier;
the control signalling transmission being related to the data transmission on the first carrier using a resource of a first type on the second carrier, wherein the resource of the first type is either an uplink resource or a downlink resource; and
the timing data specifying for the control signalling transmission a time slot in which there is available a resource of the first type on the second carrier for a transmission of the control signalling being related to the data transmission on the first carrier.
12 . Method of operating a base station, the method comprising:
determining timing data according to the method of claim 11 .
13 . Method of operating a user equipment of a communication network, the method comprising:
determining timing data according to the method of claim 11 .
14 . Method of operating a controller of a user equipment of a communication network, the communication network further including a base station, the user equipment and the base station being capable of communicating with each other over at least two carriers, the at least two carriers including a first carrier and a second carrier, both having uplink and downlink resources, the first carrier and the second carrier having different temporal configuration of its uplink and downlink resources, the method comprising:
receiving timing data from the base station, the timing data defining a timing of a control signalling transmission being related to a data transmission on the first carrier;
adjusting, depending on the timing data, the timing of the control signaling transmission by specifying a time slot in which there is available a resource of a first type on the second carrier for the control signaling transmission; and
the resource of the first type being either an uplink resource or a downlink resource.
15 . A computer program, the computer program being adapted for, when being executed by a data processor, controlling the method as set forth in claim 11 .