# US RE50,299 E1 · 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 RE50,299 E1 - Document ID: USRE50299E1 - Status: Granted - Kind: E1 - Application number: 16/934,675 - Filed: 2020-07-21 - Granted: 2025-02-11 - 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/USRE50299E1 ## 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 prohibitPHR-Timer expires and a path loss is changed more than a threshold for at least one activated cell which is used as the path loss reference, and obtaining power headroom information for each activated cell, if extended PHR is used and an uplink resource is allocated for new transmission. ## 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 prohibitPHR-Timer expires and a path loss is changed more than a threshold for at least one activated cell which is used as the path loss reference; and obtaining power headroom information for each activated cell, if extended PHR is used and an uplink resource is allocated for new transmission. ### 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 power headroom information for each activated cell is multiplexed with a higher layer data. ### Claim 4 (depends on 1) The method of claim 1, further comprising: generating a media access control (MAC) protocol data unit (PDU) including the power headroom information for each activated cell and an indicator for maximum transmit power information. ### Claim 5 (depends on 4) The method of claim 4, wherein if the indicator is 0 the indicator indicates the first type maximum transmit power information, and wherein if the indicator is 1 the indicator indicates the second type maximum transmit power information. ### 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 prohibitPHR-Timer expires and a path loss is changed more than a threshold for at least one activated cell which is used as the path loss reference, and obtain power headroom information for each activated cell, if extended PHR is used and an uplink resource is allocated for new transmission. ### 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 power headroom information for each activated cell is multiplexed with a higher layer data. ### Claim 9 (depends on 6) The UE of claim 6, wherein the controller is further configured to generate a media access control (MAC) protocol data unit (PDU) including the power headroom information for each activated cell and an indicator for maximum transmit power information. ### Claim 10 (depends on 9) The UE of claim 9, wherein if the indicator is 0 the indicator indicates the first type maximum transmit power information, and wherein if the indicator is 1 the indicator indicates the second type maximum transmit power information. ### 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 power headroom information for each activated cell from the terminal, wherein a power headroom report (PHR) for the power headroom information is triggered if a prohibitPHR-Timer expires and a path loss is changed more than a threshold for at least one activated cell which is used as the path loss reference. ### 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 power headroom information for each activated cell is multiplexed with a higher layer data. ### Claim 14 (depends on 11) The method of claim 11, further comprising: receiving a media access control (MAC) protocol data unit (PDU) including the power headroom information for each activated cell and an indicator for maximum transmit power information. ### Claim 15 (depends on 14) The method of claim 14, wherein if the indicator is 0 the indicator indicates the first type maximum transmit power information, and wherein if the indicator is 1 the indicator indicates the second type maximum transmit power information. ### 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 power headroom information for each activated cell from the terminal, wherein a power headroom report (PHR) for the power headroom information is triggered if a prohibitPHR-Timer expires and a path loss is changed more than a threshold for at least one activated cell which is used as the path loss reference. ### 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 power headroom information for each activated cell is multiplexed with a higher layer data. ### Claim 19 (depends on 16) The base station of claim 16, wherein the controller is further configured to receive a media access control (MAC) protocol data unit (PDU) including the power headroom information for each activated cell and an indicator for maximum transmit power information. ### Claim 20 (depends on 19) The base station of claim 19, wherein if the indicator is 0 the indicator indicates the first type maximum transmit power information, and wherein if the indicator is 1 the indicator indicates the second type maximum transmit power information. ### Claim 21 A method for obtaining, by a user equipment (UE), power headroom information in a communication system, the method comprising: acquiring information for a power headroom report (PHR) associated with a multiple cells; acquiring information for a path loss reference based on a second cell configuration, wherein the information for the path loss reference indicates a cell which the UE applies as the path loss reference; triggering the PHR in case that a prohibitPHR-Timer expires and 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 configured with uplink (UL), in case that 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 with configured UL and an indicator for each activated cell with configured UL, wherein the indicator indicates whether the power headroom information is based on a real physical uplink shared channel (PUSCH) transmission or a PUSCH reference format, wherein, in a case that the power headroom information is based on the real PUSCH transmission, the power headroom information is obtained based on a parameter related to a number of resource blocks and a parameter derived from modulation and coding scheme (MCS), and wherein, in case that power headroom information is based on the PUSCH reference format, the parameter related to the number of resource blocks and the parameter derived from MCS are set to 0, zero power back-off is considered and the power headroom is obtained based on a maximum uplink transmission power equal to one of a maximum allowed UE output power (PEMAX) and a nominal UE power (Ppowerclass). ### Claim 22 (depends on 21) The method of claim 21, wherein a path loss reference for a first cell is the first cell and a downlink of the second cell corresponding to an UL of the second cell is indicated by adding the second cell. ### Claim 23 (depends on 21) The method of claim 21, wherein the power headroom information for each activated cell with configured UL is multiplexed with higher layer data. ### Claim 24 (depends on 21) The method of claim 21, wherein in case that the indicator is 0 the indicator indicates the real PUSCH transmission, and wherein in case that the indicator is 1 the indicator indicates the PUSCH reference format. ### Claim 25 A method performed by a base station for power headroom information in a communication system, the method comprising: transmitting, to a user equipment (UE), information for a power headroom report (PHR) associated with multiple cells and information for a path loss reference based on a second cell configuration, wherein the information for the path loss reference indicates a cell which the UE applies as the path loss reference; and receiving, from the UE, a medium access control (MAC) protocol data unit (PDU) including power headroom information for each activated cell with configured uplink (UL) and an indicator for each activated cell with configured UL, wherein the indicator indicates whether the power headroom information is based on a real physical uplink shared channel (PUSCH) transmission or a PUSCH reference format, wherein, in a case that the power headroom information is based on the real PUSCH transmission, the power headroom information is obtained based on a parameter related to a number of resource blocks and a parameter derived from modulation and coding scheme (MCS), and wherein, in a case that power headroom information is based on the PUSCH reference format, the parameter related to the number of resource blocks and the parameter derived from MCS are set to 0, zero power back-off is considered and the power headroom is obtained based on a maximum uplink transmission power equal to one of a maximum allowed UE output power (PEMAX) and a nominal UE power (Ppowerclass). ### Claim 26 (depends on 25) The method of claim 25, wherein, a path loss reference for a first cell is the first cell and a downlink of the second cell corresponding to an UL of the second cell is indicated by adding the second cell, wherein the PHR is triggered by the UE, in case that a prohibitPHR-Timer expires and 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 power headroom information for at least one activated cell configured with UL is obtained by the UE, in case that an uplink resource is allocated for new transmission and the PHR for the multiple cells is configured. ### Claim 27 (depends on 25) The method of claim 25, wherein the power headroom information for each activated cell with configured UL is multiplexed with a higher layer data. ### Claim 28 (depends on 25) The method of claim 25, wherein in case that the indicator is 0 the indicator indicates the real PUSCH transmission, and wherein in case that the indicator is 1 the indicator indicates the PUSCH reference format. ### Claim 29 A user equipment (UE) for power headroom information in a communication system, the UE comprising: a transceiver; and a controller configured to: acquire information for a power headroom report (PHR) associated with multiple cells, acquire, via the transceiver, information for a path loss reference based on a second cell configuration, wherein the information for the path loss reference indicates a cell which the UE applies as the path loss reference, and trigger the PHR in case that a prohibitPHR-Timer expires and 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 configured with uplink (UL), in case that 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 with configured UL and an indicator for each activated cell with configured UL, wherein the indicator indicates whether the power headroom information is based on a real physical uplink shared channel (PUSCH) transmission or a PUSCH reference format, wherein, in a case that the power headroom information is based on the real PUSCH transmission, the power headroom information is obtained based on a parameter related to a number of resource blocks and a parameter derived from modulation and coding scheme (MCS), and wherein, in case that power headroom information is based on the PUSCH reference format, the parameter related to the number of resource blocks and the parameter derived from MCS are set to 0, zero power back-off is considered and the power headroom is obtained based on a maximum uplink transmission power equal to one of a maximum allowed UE output power (PEMAX) and a nominal UE power (Ppowerclass). ### Claim 30 (depends on 29) The UE of claim 29, wherein a path loss reference for a first cell is the first cell and a downlink of the second cell corresponding to an UL of the second cell is indicated by adding the second cell. ### Claim 31 (depends on 29) The UE of claim 29, wherein the power headroom information for each activated cell with configured UL is multiplexed with a higher layer data. ### Claim 32 (depends on 29) The UE of claim 29, wherein in case that the indicator is 0 the indicator indicates the real PUSCH transmission, and wherein in case that the indicator is 1 the indicator indicates the PUSCH reference format. ### Claim 33 A base station for power headroom information in a communication system, the base station comprising: a transceiver; and a controller configured to: transmit, to a user equipment (UE) via the transceiver, information for a power headroom report (PHR) associated with multiple cells and information for a path loss reference based on a second cell configuration wherein the information for the path loss reference indicates a cell which the UE applies as the path loss reference, and receive, from the UE via the transceiver, a medium access control (MAC) protocol data unit PDU including power headroom information for each activated cell with configured uplink (UL) and an indicator for each activated cell with configured UL, wherein the indicator indicates whether the power headroom information is based on a real physical uplink shared channel (PUSCH) transmission or a PUSCH reference format, wherein, in a case that the power headroom information is based on the real PUSCH transmission, the power headroom information is obtained based on a parameter related to a number of resource blocks and a parameter derived from modulation and coding scheme (MCS), and wherein, in case that power headroom information is based on the PUSCH reference format, the parameter related to the number of resource blocks and the parameter derived from MCS are set to 0, zero power back-off is considered and the power headroom is obtained based on a maximum uplink transmission power equal to one of a maximum allowed UE output power (PEMAX) and a nominal UE power (Ppowerclass). ### Claim 34 (depends on 33) The base station of claim 33, wherein a path loss reference for a first cell is the first cell and a downlink of the second cell corresponding to an UL of the second cell is indicated by adding the second cell, wherein the PHR is triggered by the UE, in case that a prohibitPHR-Timer expires and 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 power headroom information for at least one activated cell configured with UL is obtained by the UE, in case that an uplink resource is allocated for new transmission and the PHR for the multiple cells is configured. ### Claim 35 (depends on 33) The base station of claim 33, wherein the power headroom information for each activated cell with configured UL is multiplexed with higher layer data. ### Claim 36 (depends on 33) The base station of claim 33, wherein in case that the indicator is 0 the indicator indicates the real PUSCH transmission, and wherein in case that the indicator is 1 the indicator indicates the PUSCH reference format.