# US 10,122,512 B2 · Method and apparatus for supporting network listening 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 10,122,512 B2 - Document ID: US10122512B2 - Status: Granted - Kind: B2 - Application number: 15/102,829 - Filed: 2015-01-09 - Published: 2016-10-27 - Granted: 2018-11-06 - Earliest claimed: 2014-01-09 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Yunjung Yi - Web page: https://patentgrep.com/patent/US10122512B2 ## CPC - H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals} - H04B 7/2656: {for structure of frame, burst} - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0073: {Allocation arrangements that take into account other cell interferences} - H04L 5/1469: {using time-sharing} - H04W 56/001: {Synchronization between nodes} - H04W 56/0015: {one node acting as a reference for the others} - H04W 72/005 - 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 A method and apparatus for supporting a network listening in a wireless communication system is provided. A user equipment (UE) receives a subframe configuration used for the network listening, and monitors subframes indicated as subframes used for radio interface based synchronization (RIBS) by the received subframe configuration. ## Claims ### Claim 1 A method for supporting, by a user equipment (UE), a network listening in a wireless communication system, the method comprising: receiving a subframe configuration used for the network listening; monitoring a plurality of subframes indicated by the received subframe configuration, wherein the plurality of subframes are used for receiving a reference signal (RS) for a synchronization; receiving the RS for the synchronization, wherein the RS for the synchronization is received in a subframe configured for the network listening among the plurality of subframes, wherein signals of the subframe are muted except for the RS for the synchronization, wherein the RS for the synchronization is received only in a physical downlink shared channel (PDSCH) region of the plurality of subframes, and the muting of the signals of the subframe also occurs in the PDSCH region of the plurality of subframes, and wherein the muting of the signals is performed according to a muting pattern, which is configured and triggered by downlink control information (DCI); performing the synchronization based on the RS for the synchronization, wherein the synchronization is performed based on stratum levels of cells, wherein a density of the RS is increased in order to increase a reliability with a higher stratum level, and wherein the subframes are configured proportional to a stratum level in order to have an orthogonal transmission of the RS among cells with same stratum level; and receiving or transmitting data at a timing based on the synchronization. ### Claim 2 (depends on 1) The method of claim 1, wherein the subframe configuration used for the network listening is a second multicast broadcast single frequency network (MBSFN) subframe configuration for the network listening, which overrides a first MBSFN subframe configuration for a MBSFN configuration. ### Claim 3 (depends on 2) The method of claim 2, wherein the second MBSFN subframe configuration configures MBSFN subframes with a longer period than the first MBSFN subframe configuration. ### Claim 4 (depends on 2) The method of claim 2, wherein the second MBSFN subframe configuration is given by a system information block (SIB). ### Claim 5 (depends on 1) The method of claim 1, wherein the subframe configuration used for the network listening is a subframe configuration for a time division duplex (TDD) frame. ### Claim 6 (depends on 1) The method of claim 1, wherein the RS for the synchronization is received at a guard period of a special subframe. ### Claim 7 (depends on 1) The method of claim 1, wherein the RS is one of a cell-specific reference signal (CRS), a positioning reference signal (PRS), or a channel state information reference signal (CSI RS). ### Claim 8 (depends on 1) The method of claim 1, wherein a number of the subframes configured for a cell having a higher stratum level is larger than a number of the subframes configured for a cell having a lower stratum level. ### Claim 9 A user equipment (UE) configured to support a network listening in a wireless communication system, the UE comprising: a processor that: receives a subframe configuration used for the network listening; monitors a plurality of subframes indicated by the received subframe configuration, wherein the plurality of subframes are used for receiving a reference signal (RS) for a synchronization; receives the RS for the synchronization, wherein the RS for the synchronization is received in a subframe configured for the network listening among the plurality of subframes, wherein signals of the subframe are muted except for the RS for the synchronization, wherein the RS for the synchronization is received only in a physical downlink shared channel (PDSCH) region of the plurality of subframes, and the muting of the signals of the subframe also occurs in the PDSCH region of the plurality of subframes, and wherein the muting of the signals is performed according to a muting pattern, which is configured and triggered by downlink control information (DCI); performs the synchronization based on the RS for the synchronization, wherein the synchronization is performed based on stratum levels of cells, wherein a density of the RS is increased in order to increase a reliability with a higher stratum level, and wherein the subframes are configured proportional to a stratum level in order to have an orthogonal transmission of the RS among cells with same stratum level; and receives or transmits data at a timing based on the synchronization. ### Claim 10 (depends on 9) The UE of claim 9, wherein the subframe configuration used for the network listening is a second multicast broadcast single frequency network (MBSFN) subframe configuration for the network listening, which overrides a first MBSFN configuration for MBSFN configuration. ### Claim 11 (depends on 9) The UE of claim 9, wherein the subframe configuration used for the network listening is a subframe configuration for a time division duplex (TDD) frame.