# US 9,439,159 B2 · Power headroom report method and apparatus for mobile communication system supporting carrier aggregation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,439,159 B2 - Document ID: US9439159B2 - Status: Granted - Kind: B2 - Application number: 14/850,326 - Filed: 2015-09-10 - Published: 2015-12-31 - Granted: 2016-09-06 - Earliest claimed: 2010-11-05 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Soeng Hun Kim; Kyeong In Jeong; Sang Bum Kim; Gert-Jan Van Lieshout - Web page: https://patentgrep.com/patent/US9439159B2 ## CPC - H04W 52/365: {Power headroom reporting} - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 52/242: {taking into account path loss} - H04W 72/0473: {the resource being transmission power} - H04W 72/20: Control channels or signalling for resource management - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - 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 user equipment (UE) for obtaining power headroom information in a communication system are provided. The method includes acquiring information for a path loss reference, wherein the information for the path loss reference indicates whether the UE applies as the path loss reference either a downlink of a primary cell or a downlink of a secondary cell (SCell), triggering a power headroom report (PHR) if a path loss is changed more than a threshold for at least one activated cell which is used as the path loss reference, obtaining power headroom information for each activated cell, if extended PHR is used and an uplink resource is allocated for new transmission, and generating a medium access control (MAC) protocol data unit (PDU) including the power headroom information for each activated cell and an indicator for each activated cell. The indicator indicates whether power headroom information is based on a real physical uplink shared channel (PUSCH) transmission or a PUSCH reference format. ## Claims ### Claim 1 A method for obtaining, by a user equipment (UE), power headroom information in a communication system, the method comprising: acquiring information for a path loss reference, wherein the information for the path loss reference indicates whether the UE applies as the path loss reference either a downlink of a primary cell or a downlink of a secondary cell (SCell); triggering a power headroom report (PHR) if a path loss is changed more than a threshold for at least one activated cell which is used as the path loss reference; obtaining power headroom information for each activated cell, if extended PHR is used and an uplink resource is allocated for new transmission; and generating a medium access control (MAC) protocol data unit (PDU) including the power headroom information for each activated cell and an indicator for each activated cell, wherein the indicator indicates whether power headroom information is based on a real physical uplink shared channel (PUSCH) transmission or a PUSCH reference format. ### Claim 2 (depends on 1) The method of claim 1, wherein the downlink of the secondary cell corresponding to an uplink is indicated by adding the SCell. ### Claim 3 (depends on 1) The method of claim 1, wherein the PHR is triggered, if a prohibitPHR-Timer expires and the path loss is changed more than the threshold for at least one activated cell which is used as the path loss reference. ### Claim 4 (depends on 1) The method of claim 1, wherein the power headroom information for each activated cell is multiplexed with a higher layer data. ### Claim 5 (depends on 1) The method of claim 1, wherein if the indicator is 0 the indicator indicates the real PUSCH transmission, and wherein if the indicator is 1 the indicator indicates the PUSCH reference format. ### Claim 6 A user equipment (UE) for obtaining power headroom information in a communication system, the UE comprising: a transceiver configured to transmit and receive a signal; and a controller configured to: acquire information for a path loss reference, wherein the information for the path loss reference indicates whether the UE applies as the path loss reference either a downlink of a primary cell or a downlink of a secondary cell (SCell), trigger a power headroom report (PHR) if a path loss is changed more than a threshold for at least one activated cell which is used as the path loss reference, obtain power headroom information for each activated cell, if extended PHR is used and an uplink resource is allocated for new transmission, and generate a medium access control (MAC) protocol data unit (PDU) including the power headroom information for each activated cell and an indicator for each activated cell, wherein the indicator indicates whether power headroom information is based on a real physical uplink shared channel (PUSCH) transmission or a PUSCH reference format. ### Claim 7 (depends on 6) The UE of claim 6, wherein the downlink of the secondary cell corresponding to an uplink is indicated by adding the SCell. ### Claim 8 (depends on 6) The UE of claim 6, wherein the PHR is triggered, if a prohibitPHR-Timer expires and the path loss is changed more than the threshold for at least one activated cell which is used as the path loss reference. ### Claim 9 (depends on 6) The UE of claim 6, wherein the power headroom information for each activated cell is multiplexed with a higher layer data. ### Claim 10 (depends on 6) The UE of claim 6, wherein if the indicator is 0 the indicator indicates the real PUSCH transmission, and wherein if the indicator is 1 the indicator indicates the PUSCH reference format. ### Claim 11 A method for receiving power headroom information by a base station in a communication system, the method comprising: transmitting information for a path loss reference to a user equipment (UE), wherein the information for the path loss reference indicates whether the UE applies as the path loss reference either a downlink of a primary cell or a downlink of a secondary cell (SCell); and receiving a medium access control (MAC) protocol data unit (PDU) including the power headroom information for each activated cell and an indicator for maximum transmit power information, wherein a power headroom report (PHR) for the power headroom information is triggered if a path loss is changed more than a threshold for at least one activated cell which is used as the path loss reference, and wherein the indicator indicates whether power headroom information is based on a real physical uplink shared channel (PUSCH) transmission or a PUSCH reference format. ### Claim 12 (depends on 11) The method of claim 11, wherein the downlink of the secondary cell corresponding to an uplink is indicated by adding the SCell. ### Claim 13 (depends on 11) The method of claim 11, wherein the PHR is triggered, if a prohibitPHR-Timer expires and the path loss is changed more than the threshold for at least one activated cell which is used as the path loss reference. ### Claim 14 (depends on 11) The method of claim 11, wherein the power headroom information for each activated cell is multiplexed with a higher layer data. ### Claim 15 (depends on 11) The method of claim 11, wherein if the indicator is 0 the indicator indicates the real PUSCH transmission, and wherein if the indicator is 1 the indicator indicates the PUSCH reference format. ### Claim 16 A base station for receiving power headroom information in a communication system, the base station comprising: a transceiver configured to transmit and receive a signal; and a controller configured to: transmit information for a path loss reference to a user equipment (UE), wherein the information for the path loss reference indicates whether the UE applies as the path loss reference either a downlink of a primary cell or a downlink of a secondary cell (SCell), and receive a medium access control (MAC) protocol data unit (PDU) including the power headroom information for each activated cell and an indicator for maximum transmit power information, wherein a power headroom report (PHR) for the power headroom information is triggered if a path loss is changed more than a threshold for at least one activated cell which is used as the path loss reference, and wherein the indicator indicates whether power headroom information is based on a real physical uplink shared channel (PUSCH) transmission or a PUSCH reference format. ### Claim 17 (depends on 16) The base station of claim 16, wherein the downlink of the secondary cell corresponding to an uplink is indicated by adding the SCell. ### Claim 18 (depends on 16) The base station of claim 16, wherein the PHR is triggered, if a prohibitPHR-Timer expires and the path loss is changed more than the threshold for at least one activated cell which is used as the path loss reference. ### Claim 19 (depends on 16) The base station of claim 16, wherein the power headroom information for each activated cell is multiplexed with a higher layer data. ### Claim 20 (depends on 16) The base station of claim 16, wherein if the indicator is 0 the indicator indicates the real PUSCH transmission, and wherein if the indicator is 1 the indicator indicates the PUSCH reference format.