# US 8,542,624 B2 · Method of transmitting signal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,542,624 B2 - Document ID: US8542624B2 - Status: Granted - Kind: B2 - Application number: 12/808,824 - Filed: 2008-09-16 - Published: 2010-11-18 - Granted: 2013-09-24 - Earliest claimed: 2007-12-17 - Assignees: Electronics and Telecommunications Research Institute - Applicants: Su Chang Chae; Seung Kwon Cho; Young-Il Kim - Inventors: Su Chang Chae; Seung Kwon Cho; Young-Il Kim - Web page: https://patentgrep.com/patent/US8542624B2 ## CPC - H04L 25/24: Relay circuits using discharge tubes or semiconductor devices {(H04L25/22 takes precedence)} - H04L 1/0003: {by switching between different modulation schemes} - H04L 27/0008: {arrangements for allowing a transmitter or receiver to use more than one type of modulation (negotiating modulation type for two-way transmission paths H04L5/1453)} - H04L 27/34: Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems - H04L 1/0056: {Systems characterized by the type of code used (H04L1/08 takes precedence)} - H04L 2001/0097: {Relays} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A method of transmitting a signal according to the present invention includes: receiving a signal that is encoded with a predetermined code rate and that is modulated by a first modulation method from a base station; creating a signal that is obtained by demodulating the signal that is modulated by the first modulation method using a method corresponding to the first modulation method; creating a signal that is obtained by modulating the demodulated signal using a second modulation method while maintaining the predetermined code rate; and transmitting the signal that is modulated by the second modulation to a mobile station. Therefore, it is possible to reduce the cost of the relay station and simplify the system of the relay station. Further, during the modulation and demodulation, the symbol offset is changed to create various modulated and demodulated signals. ## Claims ### Claim 1 A method of transmitting a signal, comprising: defining data to be transmitted to a mobile station through a relay station; creating a data block having an integrated slot by making the number of slots of the data block for forward error correction encoding an integer; creating an encoded signal by encoding a plurality of data blocks with a predetermined code rate; creating a first modulated signal by modulating the encoded signal; and transmitting the first modulated signal to the mobile station through the relay station, wherein the creating of a data block includes: selecting a code rate and a modulation method for the data to be transmitted to the relay station; calculating the number of slots of the data block according to the selected code rate and the modulation method; and making the number of slots the integer by multiplying the least common multiple of denominators of the number of slots according to the code rate and the modulation method by the number of slots. ### Claim 2 (depends on 1) The method of claim 1, wherein the defining of data to be transmitted through the relay station defines data that is directly transmitted to the mobile station, and data that is transmitted to the mobile station through the relay station. ### Claim 3 (depends on 2) The method of claim 2, wherein the number of slots of the data block is determined according to a standard that defines the number of slots according to the code rate and the modulation method. ### Claim 4 (depends on 3) The method of claim 3, wherein the data that is directly transmitted to the mobile station determines the number of slots of the data block according to a standard that is different from that of data transmitted through the relay station. ### Claim 5 (depends on 4) The method of claim 4, wherein when the number of allocated slots is smaller than the number of slots determined by the standard, the data block has the same number of slots as that of the allocated slots. ### Claim 6 (depends on 5) The method of claim 5, wherein when the number of allocated slots is larger than that of slots determined by the standard, the number of data blocks is determined by dividing the number of allocated slots by the number of slots determined by the standard. ### Claim 7 (depends on 6) The method of claim 6, wherein when the number of allocated slots is exactly divided into the number of standard without a remainder, the number of created data blocks is equal to the quotient, and each data block includes the number of slots determined by the standard. ### Claim 8 (depends on 7) The method of claim 7, wherein when the number of allocated slots is not exactly divided into the number of standards without remainder, the number of created data blocks is 1 larger than the quotient. ### Claim 9 (depends on 8) The method of claim 8, wherein when the number of data blocks is 1 smaller than the quotient, the data blocks have a number of slots determined by the standard, and one data block has a value that is rounded up from a value obtained by dividing the sum of the remaining values and the number determined by the standard by 2 and another data block has a value that is rounded down from a value obtained by dividing the sum of the remaining values and the number determined by the standard by 2. ### Claim 10 (depends on 9) The method of claim 9, wherein when the rounded up value and the rounded down value are equal to a predetermined value, 1 is added to the rounded up value and 1 is subtracted from the rounded down value. ### Claim 11 (depends on 10) The method of claim 10, wherein the transmitting of a signal to the mobile station through the relay station includes: creating a demodulated signal by demodulating the first modulated signal; creating a second modulated signal by modulating the demodulated signal while maintaining a predetermined code rate; and transmitting the second modulated signal to the mobile station. ### Claim 12 (depends on 11) The method of claim 11, wherein the second modulated signal is modulated by a different modulation method from that of the first modulated signal.