Method and apparatus for transmitting ACK/NACK feedback information
View Patent ↗Disclosed are a method and an apparatus for transmitting ACK/NACK feedback information. By applying the technical solution of the present invention, when ACK/NACK feedback information is transmitted based on an ACK/NACK mapping table with a PUCCH format 1b with channel selection scheme, the problem of inconsistent detection results due to inconformity of the transmission scheme by a base station and a user equipment (UE) in the process of feeding back the ACK/NACK feedback information can be avoided, so as to implement a rollback of LTE Rel-8 PUCCH format 1a/1b.
1. A method for transmitting multi-bit acknowledgement/negative acknowledgement (ACK/NACK) feedback information, which comprises:
when user equipment (UE) receives only one code word on a downlink of main component carriers configured in multi-code word transmission mode, the UE acquires 1-bit ACK/NACK feedback information in accordance with one received code word and repeats such information to 2 bits as ACK/NACK feedback bits of a downlink of main component carriers;
the UE acquires the ACK/NACK feedback bit corresponding to downlink auxiliary component carriers of each configuration;
the UE sends the ACK/NACK feedback bit corresponding to the downlink component carriers of each configuration.
2. The method as claimed in claim 1 , which also comprises:
the UE determines the number of ACK/NACK feedback bits to be fed back, wherein, the sum of the number of ACK/NACK feedback bits corresponding to each downlink auxiliary component carrier and 2-bit ACK/NACK feedback bits corresponding to each downlink main component carrier is equal to the number of ACK/NACK feedback bits to be fed back by the UE.
3. The method as claimed in claim 2 , wherein the UE determines a method of the number of ACK/NACK feedback bits to be fed back, which comprises:
for a frequency division duplex (FDD) system, the UE determines the number of ACK/NACK feedback bits to be fed back in accordance with the quantity of downlink component carriers configured and transmission mode of downlink carriers of each configuration;
for a time division duplex (TDD) system, the UE determines the number of ACK/NACK feedback bits to be fed back in accordance with the quantity of downlink component carriers configured and downlink subframes of ACK/NACK feedback bits to be fed back corresponding to an uplink subframe as well as transmission mode of downlink carriers of each configuration.
4. The method as claimed in claim 1 , wherein the UE acquires ACK/NACK feedback bits corresponding to downlink auxiliary carriers of each configuration, which comprises:
the UE generates NACK or discontinuous transmission (DTX) feedback bits for a downlink auxiliary component carrier without a code word of each configuration; or,
when the UE receives only one code word on downlink auxiliary component carriers configured as a multi-code word transmission mode, the UE acquires 1-bit ACK/NACK feedback information in accordance with one received code word and repeats such information to 2 bits as ACK/NACK feedback bits of downlink auxiliary component carriers.
5. The method as claimed in claim 1 , wherein the UE sends the acquired ACK/NACK feedback bits corresponding to downlink carriers of each configuration, which comprises:
the UE determines one channel resource and corresponding modulation symbols among candidate channel resources according to the acquired ACK/NACK feedback bits corresponding to downlink component carriers of each configuration with a physical uplink control channel (PUCCH) format 1b with a channel selection scheme;
the UE sends the modulation symbols on one determined channel resource.
6. The method as claimed in claim 5 , which also comprises:
the candidate channel resource at least comprises one dynamic channel resource corresponding to a physical downlink control channel which dispatches downlink main component carriers.
7. The method as claimed in claim 6 , wherein the dynamic channel resource corresponding to a physical downlink control channel (PDCCH) which dispatches downlink main component carriers comprises:
the dynamic channel resource corresponds to a minimum control channel element (CCE) number of the PDCCH.
8. The UE as claimed in claim 7 , wherein the UE takes the dynamic channel resource corresponding to a CCE minimum number of the PDCCH as the first dynamic channel resource corresponding to downlink main component carriers among candidate channel resources used for channel selection.
9. User equipment (UE), which comprises:
an acquisition module, used to acquire 1-bit acknowledgement/negative acknowledgement (ACK/NACK) feedback information in accordance with one received code word when the UE receives only one code word on downlink main component carriers configured as a multi-code word transmission mode, and repeats such information to 2 bits as ACK/NACK feedback bits corresponding to downlink main component carriers, and acquires ACK/NACK feedback bits corresponding to downlink auxiliary component carriers of each configuration; and
a sending module, used to send ACK/NACK feedback bits corresponding to downlink component carriers of each configuration acquired by the acquisition module.
10. The UE as claimed in claim 9 , which also comprises a determination module, used to determine the number of ACK/NACK feedback bits to be fed back, wherein, the sum of the number of ACK/NACK feedback bits corresponding to each downlink auxiliary component carrier and 2-bit ACK/NACK feedback bits corresponding to the downlink main component carriers is equal to the number of ACK/NACK feedback bits to be fed back, which comprises:
for a frequency division duplex (FDD) system, the number of ACK/NACK feedback bits to be fed back is determined in accordance with the quantity of downlink component carriers configured and the transmission mode of downlink carriers of each configuration;
for a time division duplex (TDD) system, the number of ACK/NACK feedback bits to be fed back is determined in accordance with the quantity of downlink component carriers configured and downlink subframes of ACK/NACK feedback bits to be fed back corresponding to a uplink subframe as well as transmission mode of downlink carriers of each configuration.
11. The UE as claimed in claim 9 , wherein the acquisition module is also used to acquire candidate channel resources, the candidate channel resources at least comprise one dynamic channel resource corresponding to a physical downlink control channel (PDCCH) which dispatches the downlink main component carriers.
12. The UE as claimed in claim 11 , wherein the acquisition module is also used to determine a dynamic channel resource in accordance with a minimum control channel element (CCE) number of the PDCCH which dispatches the downlink main component carriers.
13. The UE as claimed in claim 12 , which also comprises a selection module, used to take a dynamic channel resource acquired by the acquisition module in accordance with the minimum CCE number of the PDCCH which dispatches downlink main component carriers as the first dynamic channel resource corresponding to downlink main component carriers used for channel selection by the UE.
14. The UE as claimed in claim 13 , wherein the selection module is also used to determine a corresponding channel resource and module symbol among candidate channel resources acquired by the acquisition module in accordance with ACK/NACK feedback bits corresponding to downlink main components carriers of each configuration acquired by the acquisition module;
the sending module sends the modulation symbol on corresponding channel resources selected by the selection module.
15. The UE as claimed in claim 9 , wherein the acquisition module acquires ACK/NACK feedback bits corresponding to downlink auxiliary components carriers of each configuration, which also comprises:
the acquisition module generates NACK or discontinuous transmission (DTX) feedback bits for downlink auxiliary component carrier without code word of each configuration; or,
when the UE receives only one code word on downlink auxiliary component carriers configured as multi-code word transmission mode, the acquisition module acquires 1-bit ACK/NACK feedback information of one received code word and repeats such information to 2 bits as ACK/NACK feedback bits of the downlink auxiliary component carriers.