# US 11,310,863 B2 · Method and apparatus for determining TDD UL-DL configuration applicable for radio frames > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,310,863 B2 - Document ID: US11310863B2 - Status: Granted - Kind: B2 - Application number: 16/899,091 - Filed: 2020-06-11 - Published: 2020-09-24 - Granted: 2022-04-19 - Earliest claimed: 2012-07-06 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Mangesh Abhimanyu Ingale; Sudhir Kumar Baghel; Soeng-Hun Kim - Web page: https://patentgrep.com/patent/US11310863B2 ## CPC - H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX] - H04B 7/2615: {using hybrid frequency-time division multiple access [FDMA-TDMA]} - H04L 5/1476: {operating bitwise} - H04W 72/20: Control channels or signalling for resource management - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Methods and apparatuses are provided for monitoring a physical downlink control channel (PDCCH) in a wireless communication system. A UE receives a system information block (SIB) from a base station. The UE obtains a first time division duplex (TDD) uplink (UL)/downlink (DL) configuration from the SIB. The UE identifies DL subframes in a radio frame. The UE monitors the PDCCH transmitted from the base station on a DL subframe included in an on duration period of a discontinuous reception (DRX) cycle. The UE obtains information about a second TDD UL/DL configuration from the monitored PDCCH. The UE applies the second TDD UL/DL configuration to the radio frame. The DL subframe corresponds to a predetermined subframe number in the radio frame. The on duration period represents a period corresponding to a predetermined number of subframes from a subframe where the DRX cycle starts, and the on duration period is repeated periodically. ## Claims ### Claim 1 A method for monitoring a physical downlink control channel (PDCCH) by a user equipment (UE) in a wireless communication system, the method comprising: receiving, by the UE, a system information block (SIB) from a base station; obtaining, by the UE, a first time division duplex (TDD) uplink (UL)/downlink (DL) configuration from the SIB; identifying, by the UE, DL subframes indicated by the obtained first TDD UL/DL configuration; monitoring, by the UE, the PDCCH transmitted from the base station on a DL subframe included in an on duration period of a discontinuous reception (DRX) cycle among the DL subframes; obtaining, by the UE, information about a second TDD UL/DL configuration from the monitored PDCCH; and applying, by the UE, the second TDD UL/DL configuration to one or more radio frames based on the obtained information, wherein the DL subframe corresponds to a predetermined subframe number, and wherein the on duration period represents a period corresponding to a predetermined number of subframes from a subframe where the DRX cycle starts, and the on duration period is repeated periodically. ### Claim 2 (depends on 1) The method of claim 1, further comprising: performing one of radio resource management (RRM) measurements and radio link monitoring (RLM) measurements during the on duration period of the DRX cycle. ### Claim 3 (depends on 1) The method of claim 1, wherein the PDCCH is monitored based on an identifier of the UE. ### Claim 4 (depends on 1) The method of claim 1, wherein the predetermined subframe number is a subframe #0. ### Claim 5 A method for transmitting information for monitoring a physical downlink control channel (PDCCH) by a base station (BS) in a wireless communication system, the method comprising: transmitting, by the BS, to a user equipment (UE), a system information block (SIB) including a first time division duplex (TDD) uplink (UL)/downlink (DL) configuration; and transmitting, by the BS, to the UE, information about a second TDD UL/DL configuration to be applied to one or more radio frames through the PDCCH on a DL subframe, the DL subframe being one of DL subframes indicated by the first TDD UL/DL configuration, wherein the DL subframe corresponds to a predetermined subframe number, wherein the DL subframe is included in an on duration period of a discontinuous reception (DRX) cycle, and wherein the on duration period represents a period corresponding to a predetermined number of subframes from a subframe where the DRX cycle starts, and the on duration period is repeated periodically. ### Claim 6 (depends on 5) The method of claim 5, wherein one of radio resource management (RRM) measurements and radio link monitoring (RLM) measurements are performed by the UE during the on duration period of the DRX cycle. ### Claim 7 (depends on 5) The method of claim 5, wherein the PDCCH is monitored based on an identifier of the UE. ### Claim 8 (depends on 5) The method of claim 5, wherein the predetermined subframe number is a subframe #0. ### Claim 9 A user equipment (UE) in a wireless communication system, the UE comprising: a transceiver configured to receive a system information block (SIB) from a base station; and at least one processor configured to: obtain a first time division duplex (TDD) uplink (UL)/downlink (DL) configuration from the SIB; identify DL subframes indicated by the obtained first TDD UL/DL configuration; monitor a physical downlink control channel (PDCCH) transmitted from the base station on a DL subframe included in an on duration period of a discontinuous reception (DRX) cycle among the DL subframes; obtain information about a second TDD UL/DL configuration from the monitored PDCCH; and apply the second TDD UL/DL configuration to one or more radio frames based on the obtained information, wherein the DL subframe corresponds to a predetermined subframe number, and wherein the on duration period represents a period corresponding to a predetermined number of subframes from a subframe where the DRX cycle starts, and the on duration period is repeated periodically. ### Claim 10 (depends on 9) The UE of claim 9, wherein the at least one processor is further configured to: perform one of radio resource management (RRM) measurements and radio link monitoring (RLM) measurements during the on duration period of the DRX cycle. ### Claim 11 (depends on 9) The UE of claim 9, wherein the PDCCH is monitored based on an identifier of the UE. ### Claim 12 (depends on 9) The UE of claim 9, wherein the predetermined subframe number is a subframe #0. ### Claim 13 A base station (BS) in a wireless communication system, the BS comprising: a transceiver; and at least one processor configured to control the transceiver to: transmit, to a user equipment (UE), a system information block (SIB) including a first time division duplex (TDD) uplink (UL)/downlink (DL) configuration; and transmit, to the UE, information about a second TDD UL/DL configuration to be applied to one or more radio frames through a physical downlink control channel (PDCCH) on a DL subframe, the DL subframe being one of DL subframes indicated by the first TDD UL/DL configuration, wherein the DL subframe corresponds to a predetermined subframe number, wherein the DL subframe is included in an on duration period of a discontinuous reception (DRX) cycle, and wherein the on duration period represents a period corresponding to a predetermined number of subframes from a subframe where the DRX cycle starts, and the on duration period is repeated periodically. ### Claim 14 (depends on 13) The BS of claim 13, wherein one of radio resource management (RRM) measurements and radio link monitoring (RLM) measurements are performed by the UE during the on duration period of the DRX cycle. ### Claim 15 (depends on 13) The BS of claim 13, wherein the PDCCH is monitored based on an identifier of the UE. ### Claim 16 (depends on 13) The BS of claim 13, wherein the predetermined subframe number is a subframe #0.