Control information transmission method and apparatus
地域：
Shenzhen
摘要
Embodiments of the present invention provide a control information transmission method and apparatus. The control information transmission method includes: determining, by a network device, N pieces of to-be-jointly-coded downlink control information DCI, where N is an integer greater than or equal to 2; coding, by the network device, the N pieces of DCI in a polar coding manner, to obtain one codeword; and mapping, by the network device, the codeword to a time-frequency resource of a downlink control channel for sending. According to the embodiments of the present invention, not only a relatively high coding gain can be obtained, but a relatively low average processing latency on a decoder side can also be obtained.
說明書
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This application is a continuation of International Application No. PCT/CN2018/071269, filed on Jan. 4, 2018, which claims priority to Chinese Patent Application No. 201710008203.9, filed on Jan. 5, 2017. The disclosures of the aforementioned patent applications are hereby incorporated by reference in their entireties.
The present invention relates to the field of communications technologies, and in particular, to a control information transmission method and apparatus.
In a long term evolution (Long Term Evolution, LTE) system, control information mainly includes downlink control information (downlink control information, DCI) and uplink control information (uplink control information, UCI). The control information carries a function of scheduling an entire communications system, and reliability and coverage of the control information directly affect reliability and coverage of the entire system.
Compared with data information, the control information usually has a shorter length. For example, a length of DCI in the LTE is usually ten-plus to seventy-plus bits. The DCI also has a relatively short code length after being coded. For example, in the LTE, coded DCI has four lengths: 72 bits, 144 bits, 288 bits, and 576 bits. In other words, a maximum length is 576 bits.
權(quán)利要求
The invention claimed is:1. A method for transmitting control information, comprising:determining N downlink control information (DCI) to be jointly encoded according to a rule, wherein N is an integer greater than or equal to 2, and the rule comprises specifics one of the following:a plurality of user equipment of the N DCIs are in same or similar channel conditions; or functions indicated by information carried in the N of DCIs are the same; cascading the N DCIs in an order, wherein the order comprises at least one of the following:a good user equipment channel condition DCI ranks higher than a poor user equipment channel condition DCI; and latency-sensitive user equipment DCI ranks higher than latency-insensitive user equipment DCI; polar encoding the cascaded N DCIs to obtain a codeword; mapping the codeword to a time-frequency resource of a downlink control channel for transmitting; and transmitting the codeword, wherein the codeword further includes an information part of the user equipment DCI that when found by the user equipment causes the user equipment to exit decoding of the polar encoded DCI. 2. The method according to claim 1 , wherein each of the N DCI comprises a cyclic redundancy check (CRC), and the CRC is formed by performing scrambling in an identifier corresponding to a user equipment of the DCI. 3. The method according to claim 1 , wherein a time-frequency resource of the downlink control channel in one time interval carries one codeword; ora time-frequency resource of the downlink control channel in one time interval carries M codewords, and user equipment of DCI comprised in any one of the M codewords is in same or similar channel conditions, wherein M is an integer greater than or equal to 2. 4. A method for transmitting control information, comprising:obtaining, to-be-decoded information that comprises downlink control information (DCI) of user equipment, wherein the to-be-decoded information carries a codeword jointly coding N DCIs in a polar encoding according to a rule, wherein N is an integer greater than or equal to 2, and the rule specifies one of the following:a plurality of user equipment of the N DCIs are in same or similar channel conditions; or functions indicated by information carried in the N of the DCIs are the same; and the N DCIs are cascaded in an order, wherein the order comprises at least one of the following:a good user equipment channel condition DCI ranks higher than a poor user equipment channel condition DCI; and latency-sensitive user equipment DCI ranks higher than latency-insensitive user equipment DCI; sequentially polar decoding the to-be-decoded information, to obtain the DCI of the user equipment; determining a user equipment identifier of the to-be-decoded information; exiting the sequential polar decoding, responsive to determining the user equipment identifier of the to-be-decoded information, before completion of the sequential polar decoding; and performing, responsive to exiting the sequential polar decoding, a next operation according to an instruction in the DCI. 5. The method according to claim 4 , wherein the DCI of the user equipment comprises a cyclic redundancy check (CRC) formed by performing scrambling on an identifier corresponding to the user equipment corresponding to the DCI; and, whereinsequentially polar decoding the to-be-decoded information to obtain the DCI of the user equipment comprises: when one DCI is decoded, descrambling a CRC in the DCI by using the identifier corresponding to the user equipment;checking, by the user equipment, an information part of the DCI by using the descrambled CRC; and responsive to the check succeeding, determining that the DCI is the DCI of the user equipment. 6. The method according to claim 5 , wherein the preset identifier corresponding to the user equipment comprises a unique identifier pre-allocated to the user equipment, or a group identifier pre-allocated to a group in which the user equipment is located. 7. A method for transmitting feedback information, comprising:determining Q feedback information, wherein the Q feedback information are feedbacks for received data carried by P data transmission units, Q is an integer greater than or equal to 2, P is greater than or equal to Q, and P is an integer; polar encoding the Q feedback information to obtain a codeword; and mapping the codeword to a corresponding time-frequency resource for transmission; and, wherein responsive to a first device being a network device, the data carried by the P data transmission units is data sent by at least one user equipment to the network device, and the at least one user equipment is in same or similar channel conditions; or responsive to the first device being user equipment, the data carried by the P data transmission units is data sent by a network device to the user equipment; and mapping the codeword to a time-frequency resource of a downlink control channel for transmitting; and transmitting the codeword, wherein the codeword further includes an information part of the user equipment DCI that when found by the user equipment causes the user equipment to exit decoding of the polar encoding. 8. The method according to claim 7 , wherein the coding the Q feedback information in the polar coding manner, to obtain the codeword comprises:dividing the Q feedback information into R information segments by using K feedback information as a basic unit, wherein K is an integer greater than or equal to 2, and K×R is greater than or equal to Q; and adding, by the first device, a CRC after each information segment, and jointly coding R information segments to which the CRC is added, to obtain one codeword. 9. The method according to claim 7 , wherein the data transmission unit comprises a code block (CB), and one piece of feedback information corresponds to at least one CB; orthe data transmission unit comprises a component carrier (CC), and one feedback information corresponds to one CC. 10. A method for transmitting feedback information, comprising:obtaining, to-be-decoded information, wherein the to-be-decoded information carries a codeword by jointly coding Q feedback information in a polar encoding, wherein Q is an integer greater than or equal to 2; and sequentially polar decoding the to-be-decoded information to obtain the Q feedback information; sending, responsive to a first device being a network device, data carried by P data transmission units by at least one user equipment to the network device, and the at least one user equipment is in same or similar channel conditions; or sending, responsive to the first device being user equipment, the data carried by the P data transmission units by a network device to the user equipment; mapping the codeword to a time-frequency resource of a downlink control channel for transmitting; and transmitting the codeword, wherein the codeword further includes an information part of the user equipment DCI that when found by the user equipment causes the user equipment to exit decoding of the polar encoding. 11. The method according to claim 10 , wherein the codeword comprises R information segments, the R information segments are obtained by dividing the Q feedback information by using K feedback information as a basic unit, and each information segment comprises one CRC; andsequentially polar decoding on the to-be-decoded information, to obtain the Q feedback information comprises: sequentially polar decoding, by the second device, the to-be-decoded information in a form of consecutive information segments, and when one information segment is decoded, checking, the information segment by using a CRC of the information segment. 12. An apparatus for transmitting control information comprising:memory; and a processor configured to execute a machine-readable instruction stored in the memory to cause the processor to:determine N downlink control information (DCI) to be jointly encoded according to a rule, wherein N is an integer greater than or equal to 2, and the rule specifies one of the following:user equipments of the N DCIs are in same or similar channel conditions; or functions indicated by information carried in the N of DCIs are the same; polar encode the N DCIs to obtain a codeword, wherein polar encoding the N DCIs to obtain the codeword includes:cascading the N DCIs in an order, wherein the order includes at least one of the following orders:DCI of user equipment in a good channel condition ranks higher than DCI of user equipment in a poor channel condition; and DCI of latency-sensitive user equipment ranks higher than DCI of latency-insensitive user equipment; map the codeword to a time-frequency resource of a downlink control channel for transmitting; identify a user equipment identifier of the DCI during decoding; exit the decoding before completion based on identifying the user equipment identifier; and perform a next operation. 13. The apparatus according to claim 12 , wherein each of the N DCI comprises a cyclic redundancy check (CRC), and the CRC is formed by performing scrambling in an identifier corresponding to a user equipment of the DCI.
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