# US 2021/0345202 A1 · Method and device for performing handover in mobile communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0345202 A1 - Document ID: US20210345202A1 - Status: Published application - Kind: A1 - Application number: 17/373,367 - Filed: 2021-07-12 - Published: 2021-11-04 - Earliest claimed: 2012-08-14 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Soeng Hun KIM; Gert Jan VAN LIESHOUT; Sang Bum KIM - Web page: https://patentgrep.com/patent/US20210345202A1 ## CPC - H04W 36/0088: {Scheduling hand-off measurements} - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 36/0055: {Transmission or use of information for re-establishing the radio link} - H04W 36/0085: {Hand-off measurements} - H04W 36/0094: {Definition of hand-off measurement parameters} - H04W 36/30: by measured or perceived connection quality data - H04W 36/38: by fixed network equipment - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX] - H04W 36/0079: {in case of hand-off failure or rejection} - H04W 36/305: {Handover due to radio link failure (control signalling for hand-off failure H04W36/0079)} - H04W 88/02: Terminal devices - H04W 88/08: Access point devices - 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 for transmitting a channel state by a terminal in a communication system, according to one embodiment, comprises the steps of: receiving discontinuous reception (DRX) configuration information from a base station; determining whether the terminal is set to transmit channel state information only in onDuration according to a DRX operation; determining whether an arbitrary subframe to be received is a subframe included in onDuration if the terminal is set to transmit the channel state information only in onDuration according to the configuration; and not transmitting the channel state information on the arbitrary subframe if the arbitrary subframe is not a subframe included in onDuration. According to the embodiment, the terminal can efficiently report channel state information. ## Claims ### Claim 1 A method performed by a terminal in a wireless communication system, the method comprising: receiving, from a base station, measurement configuration information including measurement target information and measurement report trigger information; obtaining system frame number (SFN) offset information, in case that the terminal is required to obtain the SFN offset information based on the measurement configuration information; and transmitting, to the base station, a radio resource control (RRC) message including the SFN offset information, the SFN offset information including first information indicating a difference between a first SFN of a first cell and a second SFN of a second cell and second information indicating a difference between a specific timing of the first cell and a specific timing of the second cell. ### Claim 2 (depends on 1) The method of claim 1, wherein the RRC message is transmitted after a predetermined time associated with the SFN offset information. ### Claim 3 (depends on 1) The method of claim 1, wherein the RRC message is transmitted, in case that the terminal obtains the first information and the second information. ### Claim 4 (depends on 1) The method of claim 1, wherein the measurement configuration information includes information indicating at least one cell for the measurement for the SFN offset information, and wherein the RRC message further includes a physical cell identity of the second cell. ### Claim 5 (depends on 1) The method of claim 1, wherein the second SFN of the second cell is obtained based on master information block (MIB) of the second cell. ### Claim 6 A method performed by a base station in a wireless communication system, the method comprising: transmitting, to a terminal, measurement configuration information including measurement target information and measurement report trigger information; and receiving, from the terminal, a radio resource control (RRC) message including system frame number (SFN) offset information, the SFN offset information including first information indicating a difference between a first SFN of a first cell and a second SFN of a second cell and second information indicating a difference between a specific timing of the first cell and a specific timing of the second cell, wherein the SFN offset information is received, in case that reporting for the SFN offset information is indicated. ### Claim 7 (depends on 6) The method of claim 6, wherein the RRC message is received after a predetermined time associated with the SFN offset information. ### Claim 8 (depends on 6) The method of claim 6, wherein the RRC message is received, in case that the terminal obtains the first information and the second information. ### Claim 9 (depends on 6) The method of claim 6, wherein the measurement configuration information includes information indicating at least one cell for the measurement for the SFN offset information, and wherein the RRC message further includes a physical cell identity of the second cell. ### Claim 10 (depends on 6) The method of claim 6, wherein the second SFN of the second cell is obtained based on master information block (MIB) of the second cell. ### Claim 11 A terminal in a wireless communication system, the terminal comprising: a transceiver; and a controller configured to: receive, from a base station via the transceiver, measurement configuration information including measurement target information and measurement report trigger information, obtain system frame number (SFN) offset information, in case that the terminal is required to obtain the SFN offset information based on the measurement configuration information, and transmit, to the base station via the transceiver, a radio resource control (RRC) message including the SFN offset information, the SFN offset information including first information indicating a difference between a first SFN of a first cell and a second SFN of a second cell and second information indicating a difference between a specific timing of the first cell and a specific timing of the second cell. ### Claim 12 (depends on 11) The terminal of claim 11, wherein the RRC message is transmitted after a predetermined time associated with the SFN offset information. ### Claim 13 (depends on 11) The terminal of claim 11, wherein the RRC message is transmitted, in case that the terminal obtains the first information and the second information. ### Claim 14 (depends on 11) The terminal of claim 11, wherein the measurement configuration information includes information indicating at least one cell for the measurement for the SFN offset information, and wherein the RRC message further includes a physical cell identity of the second cell. ### Claim 15 (depends on 11) The terminal of claim 11, wherein the second SFN of the second cell is obtained based on master information block (MIB) of the second cell. ### Claim 16 A base station in a wireless communication system, the base station comprising: a transceiver; and a controller configured to: transmit, to a terminal via the transceiver, measurement configuration information including measurement target information and measurement report trigger information, and receive, from the terminal via the transceiver, a radio resource control (RRC) message including system frame number (SFN) offset information, the SFN offset information including first information indicating a difference between a first SFN of a first cell and a second SFN of a second cell and second information indicating a difference between a specific timing of the first cell and a specific timing of the second cell, wherein the SFN offset information is received, in case that reporting for the SFN offset information is indicated. ### Claim 17 (depends on 16) The base station of claim 16, wherein the RRC message is received after a predetermined time associated with the SFN offset information. ### Claim 18 (depends on 16) The base station of claim 16, wherein the RRC message is received, in case that the terminal obtains the first information and the second information. ### Claim 19 (depends on 16) The base station of claim 16, wherein the measurement configuration information includes information indicating at least one cell for the measurement for the SFN offset information, and wherein the RRC message further includes a physical cell identity of the second cell. ### Claim 20 (depends on 16) The base station of claim 16, wherein the second SFN of the second cell is obtained based on master information block (MIB) of the second cell.