# US 10,455,481 B2 · Method and device for transmitting and receiving discovery signal of device-to-device communication terminal 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 10,455,481 B2 - Document ID: US10455481B2 - Status: Granted - Kind: B2 - Application number: 15/572,262 - Filed: 2016-05-09 - Published: 2018-05-03 - Granted: 2019-10-22 - Earliest claimed: 2015-05-08 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Hyukjin Chae; Hanbyul Seo - Web page: https://patentgrep.com/patent/US10455481B2 ## CPC - H04W 48/08: Access restriction or access information delivery, e.g. discovery data delivery (signalling during connection H04W76/00) - H04L 1/00: Arrangements for detecting or preventing errors in the information received {(correcting synchronisation H04L7/00)} - H04L 1/1887: {Scheduling and prioritising arrangements} - H04L 5/0033: {each allocating device acting autonomously, i.e. without negotiation with other allocating devices} - H04L 5/0082: {at predetermined intervals} - H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information} - H04W 8/005: {Discovery of network devices, e.g. terminals} - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 76/14: Direct-mode setup - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0023: {Time-frequency-space} - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04W 48/16: Discovering, processing access restriction or access information - H04W 56/0015: {one node acting as a reference for the others} - 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) ## Abstract An embodiment of the present invention relates to a method by which a terminal transmits a discovery signal in a wireless communication system, comprising the steps of: determining a subframe pool for data transmission; determining a subframe set for transmitting a D2D signal by applying a time resource pattern (TRP) bitmap to the subframe pool for the data transmission; and transmitting a discovery message in a subframe corresponding to the n number of bits of the TRP bitmap. ## Claims ### Claim 1 A method of transmitting a discovery signal, by a user equipment (UE) in a wireless communication system, the method comprising: determining a subframe set for transmitting a discovery signal indicated by a time resource pattern (TRP) bitmap in a resource pool for transmitting device-to-device (D2D) data; determining a subframe for transmitting the discovery signal based on a length of the discovery signal among a first subframe included in the subframe set and a second subframe included in a discovery resource pool allocated from a base station, wherein the first subframe is n subframes indicated by n bits among bits included in the TRP bitmap, where n is a positive integer; and transmitting the discovery signal in the determined subframe, wherein when the length of the discovery signal is greater than a predetermined length, the subframe for transmitting the discovery signal is determined as the first subframe. ### Claim 2 (depends on 1) The method of claim 1, wherein when the discovery signal or the D2D data is transmitted in the first subframe, the UE transmits a D2D control channel related to the first subframe, and wherein a cyclic redundancy check (CRC) mask for the D2D control channel when the discovery signal is transmitted in the first subframe is different from a CRC mask for the D2D control channel when the D2D data is transmitted in the first subframe. ### Claim 3 (depends on 1) The method of claim 1, wherein when the discovery signal or the D2D data is transmitted in the first subframe, the UE transmits a D2D control channel related to the first subframe, and wherein a demodulation reference signal (DMRS) sequence for the D2D control channel when the discovery signal is transmitted in the first subframe is different from a DMRS sequence for the D2D control channel when the D2D data is transmitted in the first subframe. ### Claim 4 (depends on 1) The method of claim 1, wherein the discovery signal is transmitted in a resource block (RB) of a predetermined size in the first subframe. ### Claim 5 (depends on 1) The method of claim 1, wherein a position of the n bits is determined by one selected from the group consisting of an identifier (ID), a layer 2 (L2) ID, an L2 scheduling assignment (SA) ID, and a discovery ID in the TRP bitmap. ### Claim 6 (depends on 1) The method of claim 1, wherein a position of the n bits is randomly determined by the UE from among positive integers equal to or less than a quotient that results from dividing the TRP bitmap by 4. ### Claim 7 A method of receiving a discovery signal, which is received by a user equipment (UE) in a wireless communication system, the method comprising: determining a subframe set for receiving a discovery signal indicated by a time resource pattern (TRP) bitmap in a resource pool for transmitting device-to-device (D2D) data; and receiving a discovery signal in a first subframe included in the subframe set or in a second subframe included in a discovery resource pool allocated from a base station, wherein when the discovery signal is received in the first subframe, the discovery signal has a length greater than a predetermined length, and wherein the first subframe in which the discovery signal is received is n subframes indicated by n bits among bits included in the TRP bitmap, where n is a positive integer. ### Claim 8 (depends on 7) The method of claim 7, wherein when the discovery signal or the D2D data is transmitted in the first subframe, the UE receives a D2D control channel related to the first subframe, and wherein the UE recognizes that the discovery signal is transmitted in the first subframe through checking a cyclic redundancy check (CRC) of the D2D control channel. ### Claim 9 (depends on 7) The method of claim 7, wherein when the discovery signal or the D2D data is transmitted in the first subframe, the UE receives a D2D control channel related to the first subframe, and wherein the UE recognizes that the discovery signal is transmitted in the first subframe through a demodulation reference signal (DMRS) sequence of a D2D control channel. ### Claim 10 (depends on 7) The method of claim 7, wherein the discovery signal is transmitted in a resource block (RB) of a predetermined size in the first subframe. ### Claim 11 (depends on 7) The method of claim 7, wherein a position of the n bits is determined using one selected from the group consisting of an identifier (ID), a layer 2 (L2) ID, an L2 scheduling assignment (SA) ID, and a discovery ID in the TRP bitmap. ### Claim 12 (depends on 7) The method of claim 7, wherein a position of the n bits is randomly determined by the UE from among positive integers equal to or less than a quotient that results from dividing the TRP bitmap by 4.