# US 8,542,570 B2 · Apparatus and method for transceiving signals using frame structure 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 8,542,570 B2 - Document ID: US8542570B2 - Status: Granted - Kind: B2 - Application number: 12/870,429 - Filed: 2010-08-27 - Published: 2011-03-03 - Granted: 2013-09-24 - Earliest claimed: 2009-08-27 - Assignees: LG Electronics Inc. - Applicants: Dong Guk Lim; Han Gyu Cho; Sung Ho Moon; Jin Sam Kwak - Inventors: Dong Guk Lim; Han Gyu Cho; Sung Ho Moon; Jin Sam Kwak - Web page: https://patentgrep.com/patent/US8542570B2 ## CPC - H04L 27/2604: {Multiresolution systems (by means of multiresolution subcarriers H04L27/183, H04L27/3488)} - H04L 27/2602: {Signal structure} - H04L 27/2607: {Cyclic extensions} - H04L 27/2603: {Signal structure ensuring backward compatibility with legacy system} - H04L 27/26035: {Maintenance of orthogonality, e.g. for signals exchanged between cells or users, or by using covering codes or sequences (using different training sequence per antenna H04B7/0684; code allocation H04J13/16)} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A method and apparatus for transceiving signals using a predetermined frame structure in a wireless communication system is provided. The apparatus includes a Radio Frequency (RF) unit for transceiving a signal through a frame according to the predetermined frame structure. The frame includes 5 subframes, the 5 subframe comprise type-1 subframes including 6 Orthogonal Frequency Division Multiplex Access (OFDMA) symbols and type-2 subframes including 7 OFDMA symbols, and a Cyclic Prefix (CP) length of the frame corresponds to ⅛ of an effective symbol length. ## Claims ### Claim 1 A method for transceiving signals in a wireless communication system, the method comprising: transceiving a signal through a frame, wherein the frame consists of 5 subframes, the 5 subframes comprise at least one type-1 subframe and at least one type-2 subframe, each of the at least one type-1 subframe consists of 6 Orthogonal Frequency Division Multiplex Access (OFDMA) symbols and each of at least one type-2 subframe consists of 7 OFDMA symbols, wherein a Cyclic Prefix (CP) length of the frame corresponds to ⅛ of an effective symbol length, wherein a first subframe is located at a beginning of the frame and a second subframe is located next to the first subframe, and wherein the first subframe of the frame is a type-1 subframe and the second subframe of the frame is a type-2 subframe. ### Claim 2 (depends on 1) The method according to claim 1, wherein the frame is a Time Division Duplex (TDD) frame or a Frequency Division Duplex (FDD) frame. ### Claim 3 (depends on 2) The method according to claim 2, wherein the frame is a TDD frame and the TDD frame includes 2 type-1 subframes and 3 type-2 subframes. ### Claim 4 (depends on 3) The method according to claim 3, wherein the TDD frame includes a downlink interval and an uplink interval subsequent to the downlink interval and a Transmit Transition Gap (TTG) interval is located between the downlink interval and the uplink interval and a Receive Transition Gap (RTG) interval is located next to a last subframe of the uplink interval. ### Claim 5 (depends on 3) The method according to claim 3, wherein a ratio of a number of downlink subframes to a number of uplink subframes in the TDD frame is 3:2 or 2:3. ### Claim 6 (depends on 2) The method according to claim 2, wherein the frame has a channel bandwidth of 7 MHz. ### Claim 7 (depends on 2) The method according to claim 2, wherein the TDD frame includes 33 OFDMA symbols and the FDD frame includes 34 OFDMA symbols. ### Claim 8 (depends on 2) The method according to claim 2, wherein a third subframe is located next to the second subframe and the third subframe is a type-2 subframe. ### Claim 9 (depends on 8) The method according to claim 8, wherein a fourth subframe is located next to the third subframe, and wherein the fourth subframe of the TDD frame is a type-1 subframe and the fourth subframe of the FDD frame is a type-2 subframe. ### Claim 10 (depends on 1) The method according to claim 1, wherein a last subframe is a type-2 subframe. ### Claim 11 An apparatus for transceiving signals in a wireless communication system, the apparatus comprising: a Radio Frequency (RF) unit; and a processor, wherein the processor is configured to cause: the RF unit to transceive a signal through a frame, wherein the frame consists of 5 subframes, the 5 subframes comprise at least one type-1 subframes and at least one type-2 subframe, each of the at least one type-1 subframe consists of 6 Orthogonal Frequency Division Multiplex Access (OFDMA) symbols and each of the at least one 7 OFDMA symbols, wherein a Cyclic Prefix (CP) length of the frame corresponds to ⅛ of an effective symbol length, wherein a first subframe is located at a beginning of the frame and a second subframe is located next to the first subframe, and wherein the first subframe of the frame is a type-1 subframe and the second subframe of the frame is a type-2 subframe. ### Claim 12 (depends on 11) The apparatus according to claim 11, wherein the frame is a Time Division Duplex (TDD) frame or a Frequency Division Duplex (FDD) frame. ### Claim 13 (depends on 12) The apparatus according to claim 12, wherein the frame is a TDD frame and the TDD frame includes 2 type-1 subframes and 3 type-2 subframes. ### Claim 14 (depends on 13) The apparatus according to claim 13, wherein the TDD frame includes a downlink interval and an uplink interval subsequent to the downlink interval and a Transmit Transition Gap (TTG) interval is located between the downlink section and the uplink interval and a Receive Transition Gap (RTG) interval is located next to a last subframe of the uplink interval. ### Claim 15 (depends on 13) The apparatus according to claim 13, wherein a ratio of a number of downlink subframes to a number of uplink subframes in the TDD frame is 3:2 or 2:3.