# US 2017/0257191 A1 · Method and apparatus for transmitting downlink control information in wireless communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0257191 A1 - Document ID: US20170257191A1 - Status: Published application - Kind: A1 - Application number: 15/598,963 - Filed: 2017-05-18 - Published: 2017-09-07 - Earliest claimed: 2012-12-18 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Dongyoun Seo; Joonkui Ahn; Suckchel Yang; Yunjung Yi; Daesung Hwang - Web page: https://patentgrep.com/patent/US20170257191A1 ## CPC - H04L 1/1822: involving configuration of automatic repeat request [ARQ] with parallel processes - H04B 7/15557: {Selecting relay station operation mode, e.g. between amplify and forward mode, decode and forward mode or FDD - and TDD mode} - H04L 1/1854: {Scheduling and prioritising arrangements} - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04L 5/14: Two-way operation using the same type of signal, i.e. duplex - H04W 16/32: Hierarchical cell structures - H04W 48/12: using downlink control channel - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - H04W 74/002: {Transmission of channel access control information} - H04W 74/004: {in the uplink, i.e. towards network} - H04W 74/006: {in the downlink, i.e. towards the terminal} - H04W 76/19: Connection re-establishment - H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ] - H04W 84/025: {with acknowledge back capability} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Provided are a method and an apparatus for transmitting downlink control information in a wireless communication system configured with a plurality of serving cells. The method generates downlink control information scheduling frequency division duplex (FDD) cells by means of FDD frames (DCI_FDD) and downlink control information scheduling time division duplex (TDD) cells by means of TDD frames (DCI_TDD), and transmits the DCI_FDD and the DCI_TDD, wherein parts of the fields of DCI_FDD and DCI_TDD are generated to have equal bit sizes, and if the FDD or TDD cell is used exclusively, then said parts of the fields in the FDD and TDD cells have mutually different bit sizes. ## Claims ### Claim at position 1 1-18. (canceled) ### Claim 19 A method for receiving downlink control information (DCI) in a wireless communication system, the method performed by a user equipment (UE) which is configured with a plurality of serving cells, the method comprising: receiving DCI for a frequency division duplex (FDD) cell which uses FDD frames (DCI_FDD) and DCI for a time division duplex (TDD) cell which uses TDD frames (DCI_TDD); and decoding the DCI_FDD and the DCI_TDD, wherein when the plurality of serving cells comprise an FDD cell and a TDD cell, a hybrid automatic repeat request (HARQ) process number field in the DCI_FDD and in the DCI_TDD has the same bit size and the bit size depends on whether a primary cell is an FDD cell or a TDD cell. ### Claim 20 (depends on 19) The method of claim 19, wherein the primary cell is an FDD cell in which the UE performs an initial connection establishment procedure or a connection re-establishment procedure with respect to a base station, and wherein at least one secondary cell is a TDD cell which is allocated to the UE in addition to the primary cell. ### Claim 21 (depends on 20) The method of claim 20, wherein the DCI_TDD does not include a downlink assignment index (DAI) field. ### Claim 22 (depends on 20) The method of claim 20, wherein the DCI_TDD includes a 3-bit HARQ process number field. ### Claim 23 (depends on 19) The method of claim 19, wherein the primary cell is a TDD cell in which the UE performs an initial connection establishment procedure or a connection re-establishment procedure with respect to a base station, and wherein at least one secondary cell is an FDD cell which is allocated to the UE in addition to the primary cell. ### Claim 24 (depends on 23) The method of claim 23, wherein the DCI_FDD includes a downlink assignment index (DAI) field. ### Claim 25 (depends on 23) The method of claim 23, wherein the DCI_FDD includes a 4-bit HARQ process number field. ### Claim 26 (depends on 19) The method of claim 19, wherein when the plurality of serving cells are all the same type of cell, either FDD cells or TDD cells, the bit size of the HARQ process number field in the DCI_FDD and DCI_TDD depends on whether the plurality of serving cells are FDD cells or TDD cells. ### Claim 27 A user equipment (UE) comprising: a radio frequency (RF) unit that transmits and receives a radio signal; and a processor operatively coupled to the RF unit, wherein the processor receives DCI for a frequency division duplex (FDD) cell which uses FDD frames (DCI_FDD) and DCI for a time division duplex (TDD) cell which uses TDD frames (DCI_TDD), and decodes the DCI_FDD and the DCI_TDD, wherein when the plurality of serving cells comprise an FDD cell and a TDD cell, a hybrid automatic repeat request (HARQ) process number field in the DCI_FDD and in the DCI_TDD has the same bit size and the bit size depends on whether a primary cell is an FDD cell or a TDD cell. ### Claim 28 (depends on 27) The UE of claim 27, wherein the primary cell is an FDD cell in which the UE performs an initial connection establishment procedure or a connection re-establishment procedure with respect to a base station, and wherein at least one secondary cell is a TDD cell which is allocated to the UE in addition to the primary cell. ### Claim 29 (depends on 28) The UE of claim 28, wherein the DCI_TDD does not include a downlink assignment index (DAI) field. ### Claim 30 (depends on 28) The UE of claim 28, wherein the DCI_TDD includes a 3-bit HARQ process number field. ### Claim 31 (depends on 27) The UE of claim 27, wherein the primary cell is a TDD cell in which the UE performs an initial connection establishment procedure or a connection re-establishment procedure with respect to a base station, and wherein at least one secondary cell is an FDD cell which is allocated to the UE in addition to the primary cell. ### Claim 32 (depends on 31) The UE of claim 31, wherein the DCI_FDD includes a downlink assignment index (DAI) field. ### Claim 33 (depends on 31) The UE of claim 31, wherein the DCI_FDD includes a 4-bit HARQ process number field. ### Claim 34 (depends on 27) The UE of claim 27, wherein when the plurality of serving cells are all the same type of cell, either FDD cells or TDD cells, the bit size of the HARQ process number field in the DCI_FDD and DCI_TDD depends on whether the plurality of serving cells are FDD cells or TDD cells.