HARQ ACK/NACK for dynamic PDSCH
View Patent ↗The aim of the present invention is to provide an efficient and reliable transmission/reception mechanisms for a communication system with multiple component carriers, each of which further includes physical resources such as transmission slot/symbol, subcarrier/frequency subband, code, or radiation pattern. Accordingly, the control signal of a component carrier comprises a scheduling assignment specifying for said component carrier a resource for transmission of a data signal, and an allocation map specifying that a scheduling assignment has been sent for another component carrier. Signalizing the allocation map enables detection of possibly missed scheduling assignments.
1. A method for transmitting a data signal and a control signal in a wireless communication system supporting aggregation of a plurality of component carriers, each component carrier comprising resources specified by at least transmission slot and subband frequency, the method comprising the step of:
generating a scheduling assignment specifying for a first component carrier a resource for transmission of a data signal;
determining an allocation map represented by a bitmap with each bit specifying whether, for a single respective carrier of the plurality of component carriers, and for which of the plurality of component carriers including a second component carrier, a scheduling assignment has been generated;
transmitting a control signal within the first component carrier, the control signal comprising the generated scheduling assignment for the first component carrier and the allocation map;
transmitting the data signal using the resource for transmission of the data signal, said resource for transmission of the data signal being specified by the scheduling assignment for the first component carrier; and
receiving, within a resource for transmission of an acknowledgement signal linked with the resource for transmission of the data signal specified for the first component carrier, an acknowledgement signal related to the transmitted data signal, wherein the acknowledgement signal is common for data signals in a plurality of component carriers,
wherein a control signal within the second component carrier comprises a relative index linked to the resource for transmission of the acknowledgement signal within the first component carrier.
2. The method according to claim 1 wherein each of the plurality of component carriers comprises at least one of the allocation map and the relative index.
3. The method according to claim 1 wherein the wireless communication system is an LTE-Advanced based system.
4. A method for receiving a data signal and a control signal in a wireless communication system supporting aggregation of a plurality of component carriers, each component carrier comprising resources specified by at least transmission slot and subband frequency, the method comprising the steps of
receiving a control signal within a first component carrier and within a second component carrier;
extracting from the control signal within the first component carrier a scheduling assignment specifying for the first component carrier a resource for receiving a data signal;
extracting from the control signal within the first component carrier an allocation map represented by a bitmap with each bit specifying whether, for a single respective carrier of the plurality of component carriers, and for which of the plurality of component carriers including the second component carrier, a scheduling assignment has been generated;
evaluating based on the allocation map and on a control signal within the second component carrier whether a scheduling assignment for the second component carrier has been sent and received;
receiving the data signal using the resource for receiving of the data signal, said resource for receiving of the data signal being specified by the scheduling assignment for the first component carrier; and
transmitting, within a resource for transmission of an acknowledgement signal linked with the resource for receiving the data signal specified for the first component carrier, an acknowledgement signal related to the received data signal, wherein the acknowledgement signal is common for data signals in a plurality of component carriers,
wherein a control signal within the second component carrier comprises a relative index linked to the resource for transmission of the acknowledgement signal within the first component carrier.
5. The method according to claim 4 wherein each of the plurality of component carriers comprises at least one of the allocation map and the relative index.
6. The method according to claim 4 wherein the wireless communication system is an LTE-Advanced based system.
7. An apparatus for transmitting a data signal and a control signal in a wireless communication system supporting aggregation of a plurality of component carriers, each component carrier comprising resources specified by at least transmission slot and subband frequency, the apparatus comprising:
an allocation unit for generating a scheduling assignment specifying for a first component carrier a resource for transmission of a data signal;
a map determining unit for determining an allocation map represented by a bitmap with each bit specifying whether, for a single respective carrier of the plurality of component carriers, and for which of the plurality of component carriers including a second component carrier, a scheduling assignment has been generated;
a control signal transmitting unit for transmitting a control signal within the first component carrier, the control signal comprising the generated scheduling assignment for the first component carrier and the allocation map;
a data signal transmitting unit for transmitting the data signal using the resource for transmission of the data signal, said resource for transmission of the data signal being specified by the scheduling assignment for the first component carrier; and
a feedback receiving unit for receiving, within a resource for receiving of an acknowledgement signal linked with the resource for transmission of the data signal specified for the first component carrier, an acknowledgement signal based on the transmitted data signal, wherein the acknowledgement signal is common for data signals in a plurality of component carriers,
wherein a control signal within the second component carrier comprises a relative index linked to a resource for transmission of the acknowledgement signal within the first component carrier.
8. The apparatus according to claim 7 wherein each of the plurality of component carriers comprises at least one of the allocation map and the relative index.
9. The apparatus according to claim 7 wherein the wireless communication system is an LTE-Advanced based system.
10. An apparatus for receiving a data signal and a control signal in a wireless communication system supporting aggregation of a plurality of component carriers, each component carrier comprising resources specified by at least transmission slot and subband frequency, the apparatus comprising:
a control signal receiving unit for receiving a control signal within a first component carrier and within a second component carrier;
an extraction unit for extracting from the control signal within the first component carrier a scheduling assignment specifying for the first component carrier a resource for receiving a data signal, and for extracting from the control signal within the first component carrier an allocation map represented by a bitmap with each bit specifying whether, for a single respective carrier of the plurality of component carriers, and for which of the plurality of component carriers including the second component carrier, a scheduling assignment has been generated;
an evaluation unit for evaluating based on the allocation map and on a control signal within the second component carrier whether a scheduling assignment for the second component carrier has been sent and received;
a data signal receiving unit for receiving the data signal using the resource for receiving of the data signal, said resource for receiving of the data signal being specified by the scheduling assignment for the first component carrier; and
a feedback transmitting unit, within a resource for transmission of an acknowledgement signal linked with the resource for receiving the data signal specified for the first component carrier, an acknowledgement signal based on the received data signal,
wherein the acknowledgement signal is common for data signals in a plurality of component carriers and
wherein a control signal within the second component carrier comprises a relative index linked to the resource for transmission of the acknowledgement signal within the first component carrier.
11. The apparatus according to claim 10 wherein each of the plurality of component carriers comprises at least one of the allocation map and the relative index.
12. The apparatus according to claim 10 wherein the wireless communication system is an LTE-Advanced based system.