US Patent No. 9,585,131

METHOD AND DEVICE FOR TRANSMITTING UPLINK CONTROL INFORMATION (UCI)


Patent No. 9,585,131
Issue Date February 28, 2017
Title Method And Device For Transmitting Uplink Control Information (uci)
Inventorship Xuejuan Gao, Beijing (CN)
Yanan Lin, Beijing (CN)
Qianqian Si, Beijing (CN)
Assignee China Academy of Telecommunications Technology, Beijing (CN)

Claim of US Patent No. 9,585,131

1. A method for transmitting Uplink Control Information, UCI, wherein the method comprises:
determining, by a user equipment, a minimum number Bmin of feedback bits and/or a maximum number Bmax of feedback bits of Acknowledgement, ACK/Non-Acknowledgement, NACK, in a current subframe;

selecting, by the user equipment, a downlink carrier and judging a relationship between a number C of feedback bits for judgment
corresponding to a Channel State Information, CSI, reporting type of the downlink carrier, and a threshold number A of concurrently
transmitted UCI bits in the current subframe and Bmin and/or Bmax;

when a result of the judgment by the user equipment is C>A?Bmin, generating, by the user equipment, Bmax bits of ACK/NACK feedback information and transmitting the generated ACK/NACK feedback information on a corresponding channel
resource in the current subframe;

when the result of the judgment by the user equipment is C?A?Bmax, generating, by the user equipment, Bmax bits of ACK/NACK feedback information and C bits of CSI feedback information and transmitting the generated ACK/NACK feedback
information and CSI feedback information concurrently on a corresponding channel resource in the current subframe;

when the result of the judgment by the user equipment is C>A?Bmax and C?A?Bmin, generating, by the user equipment, C bits of CSI feedback information, spatially bundling ACK/NACK feedback information
of all or a part of downlink carriers with multi-codeword transmission and transmitting the generated spatially-bundled ACK/NACK
feedback information and CSI feedback information concurrently on a corresponding channel resource in the current subframe,
wherein a number of bits of the spatially-bundled ACK/NACK feedback information does not exceed a value of A?C;

wherein determining, by the user equipment, the minimum number Bmin of feedback bits and/or the maximum number Bmax of feedback bits of ACK/NACK in the current subframe comprises:

determining, by the user equipment, Bmin according to a number N of configured carriers and a number Mi of downlink subframes, on each carrier i, for which ACK/NACK needs to be fed back in the current subframe in accordance with
the following equation:


and/or
determining, by the user equipment, Bmax according to a number N of configured carriers, a transmission mode of each configured carrier and a number Mi of downlink subframes, on each carrier i, for which ACK/NACK needs to be fed back in the current subframe in accordance with
the following equation:


wherein Ci takes a value under the following rule:

for a carrier with single-codeword transmission, Ci=1, and for a carrier with multi-codeword transmission, Ci=2; or

for a carrier with single-codeword transmission or for a carrier with multi-codeword transmission and spatial bundling, Ci=1, and for a carrier with multi-codeword transmission and without spatial bundling, Ci=2;

wherein Mi represents the number of downlink subframes, on the carrier i, for which ACK/NACK needs to be fed back in the current subframe,
and it takes a value under the following rule: for a Frequency Division Duplex, FDD, system, Mi=1; and for a Time Division Duplex, TDD, system, Mi corresponding to different aggregated carriers take the same or different values.