# US 11,116,022 B2 · Method for relaying messages in low power wide area network and apparatus therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,116,022 B2 - Document ID: US11116022B2 - Status: Granted - Kind: B2 - Application number: 16/733,153 - Filed: 2020-01-02 - Published: 2020-10-01 - Granted: 2021-09-07 - Earliest claimed: 2019-03-29 - Assignees: Electronics and Telecommunications Research Institute - Applicants: Electronics and Telecommunications Research Institute - Inventors: Wun Cheol Jeong; Eun Hee Kim; Tae Joon Park; Geon Min Yeo; Kye Seon Lee - Web page: https://patentgrep.com/patent/US11116022B2 ## CPC - H04W 76/14: Direct-mode setup - H04W 76/18: Management of setup rejection or failure - H04L 1/0061: {Error detection codes} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information} - H04L 27/364: {Arrangements for overcoming imperfections in the modulator, e.g. quadrature error or unbalanced I and Q levels} - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04W 88/184: {Messaging devices, e.g. message centre} - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 27/0006: {Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio (for spectrum sharing between different networks H04W16/14)} - H04W 88/04: adapted for relaying to or from another terminal or user - Y02D 30/70: in wireless communication networks - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract Disclosed are methods and apparatuses for relaying messages in LPWAN. An operation method of a terminal may comprise transmitting a first join request message to a base station without IQ inversion; when a number of failed transmissions of the first join request message is greater than or equal to a preconfigured threshold, transmitting an IQ-inverted second join request message to a relay; and receiving a join response message from the relay that is a response to the second join request message. Accordingly, the performance of the communication system can be improved. ## Claims ### Claim 1 An operation method of a terminal in a communication system, the operation method comprising: transmitting a first join request message to a base station without IQ inversion; when a number of failed transmissions of the first join request message is greater than or equal to a preconfigured threshold, transmitting an IQ-inverted second join request message to a relay; and receiving a join response message from the relay that is a response to the second join request message, wherein the second join request message is transmitted to the base station through the relay, and the join response message is generated by the base station. ### Claim 2 (depends on 1) The operation method according to claim 1, wherein the first join request message is transmitted through a first channel used for direct communication between the terminal and the base station, and the second join request message is transmitted through a second channel used for communication through the relay. ### Claim 3 (depends on 1) The operation method according to claim 1, wherein when the number of failed transmissions of the first join request message is less than the preconfigured threshold, a transmitter included in the terminal operates to transmit a non-IQ-inverted message, and a receiver included in the terminal operates to receive an IQ-inverted message. ### Claim 4 (depends on 1) The operation method according to claim 1, wherein when the number of failed transmissions of the first join request message is greater than or equal to the preconfigured threshold, a transmitter included in the terminal operates to transmit an IQ-inverted message, and a receiver included in the terminal operates to receive a non-IQ-inverted message. ### Claim 5 (depends on 1) The operation method according to claim 1, wherein the join response message is a join response message that is non-IQ-inverted. ### Claim 6 An operation method of a relay in a communication system, the operation method comprising: performing a monitoring operation on a channel; performing a decoding operation on a message received in the channel when the message is IQ-inverted; and retransmitting the message when the decoded message is valid, wherein the retransmitted message is a message that is IQ-inverted. ### Claim 7 (depends on 6) The operation method according to claim 6, wherein the channel is a first channel used for communication through the relay, and the first channel is different from a second channel used for communication between a base station and a terminal. ### Claim 8 (depends on 7) The operation method according to claim 7, wherein the message is retransmitted through the first channel. ### Claim 9 (depends on 6) The operation method according to claim 6, wherein validity of the decoded message is determined based on a cyclic redundancy check (CRC). ### Claim 10 (depends on 6) The operation method according to claim 6, wherein a relaying operation is performed when an IQ-inverted message is received in the channel, and the relaying operation is not performed when a non-IQ-inverted message is received in the channel. ### Claim 11 A terminal in a communication system, the terminal comprising: a processor; a transmitter performing a transmission operation according to control of the processor; a receiver performing a reception operation according to control of the processor; and a memory storing at least one instruction executable by the processor, wherein the at least one instruction configures the processor to: transmit a first join request message to a base station without IQ inversion; when a number of failed transmissions of the first join request message is greater than or equal to a preconfigured threshold, transmit an IQ-inverted second join request message to a relay; and receive a join response message from the relay that is a response to the second join request message, wherein the second join request message is transmitted to the base station through the relay, and the join response message is generated by the base station. ### Claim 12 (depends on 11) The terminal according to claim 11, wherein the first join request message is transmitted through a first channel used for direct communication between the terminal and the base station, and the second join request message is transmitted through a second channel used for communication through the relay. ### Claim 13 (depends on 11) The terminal according to claim 11, wherein when the number of failed transmissions of the first join request message is greater than or equal to the preconfigured threshold, a transmitter included in the terminal operates to transmit an IQ-inverted message, and a receiver included in the terminal operates to receive a non-IQ-inverted message.