# US 7,412,252 B2 · System, transmitter, receiver and method for communication power control > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,412,252 B2 - Document ID: US7412252B2 - Status: Granted - Kind: B2 - Application number: 10/439,250 - Filed: 2003-05-15 - Published: 2004-04-22 - Granted: 2008-08-12 - Earliest claimed: 2002-05-15 - Assignees: IPWireless, Inc. - Inventors: Nicholas William Anderson - Web page: https://patentgrep.com/patent/US7412252B2 ## CPC - H04W 52/08: Closed loop power control - H04W 52/12: Outer and inner loops - H04W 52/20: using error rate - H04W 52/24: using SIR [Signal to Interference Ratio] or other wireless path parameters - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A system, transmitter, receiver and method for communication power control by the transmitting entity (150A) keeping a sequence number counter (200) per UE (130A) that is incremented whenever a common channel transmission is made specifically to that UE, the value of the counter is signalled inside the message itself (or possibly by other signalling means) across the Uu interface, when the intended recipient UE correctly decodes a message, it also decodes the counter value, it compares this counter value with the last correctly received sequence number, which it holds in a memory (300), and deduces whether there are any missing sequence numbers, and accordingly effects transmission power control, this provides the advantage that the transmitting entity is able to provide information to the receiving entity that enables a correct recipient-specific error statistic to be generated, when applied to 3GPP release 5 HS-SCCH for TDD, this technique is able to assist the UE in calculating a correct error statistic for the HS-SCCH enabling the UE then to correctly set the SIR target to meet the desired HS-SCCH error target, and to then consequently correctly set the TPC command direction as “power-up” or “power-down”. ## Claims ### Claim 1 A communication system having communication power control, the system comprising: at a transmitter, means for holding a value representative of the number of transmissions intended for a predetermined receiver; and means for communicating the holding value; and at a receiver, means for holding the communicated holding value; means for holding an identification value associated with the last transmission successfully decoded at the receiver means for comparing the communicated holding value to the identification value to estimate signal reliability; and means for using the estimated signal reliability to effect transmission power control. ### Claim 2 (depends on 1) The communication system of claim 1, wherein the means for communicating the transmitter holding value comprises means for transmitting the transmitter holding value in a message to the receiver. ### Claim 3 (depends on 1) The communication system of claim 1, wherein the means for using the estimated signal reliability to effect transmission power control further comprises: means for estimating a signal quality; means for comparing the estimated signal quality to a signal quality target; means for effecting transmission power control based on the comparison of the estimated signal quality to the signal quality target; and means for adjusting the signal quality target based on the estimated signal reliability. ### Claim 4 (depends on 3) The communication system of claim 3, wherein the estimated signal quality is a signal-to interference ratio (SIR), and wherein the signal quality target is a SIR target. ### Claim 5 (depends on 1) The communication system of claim 1, wherein the means for using the estimated signal reliability to effect transmission power control comprises means for adjusting up/down commands of a transmitter power control. ### Claim 6 (depends on 1) The communication system of claim 1, wherein the transmissions are communicated on a high speed shared control channel. ### Claim 7 (depends on 1) The communication system of claim 1, wherein the system is a Universal Mobile Telecommunications System (UMTS) system. ### Claim 8 (depends on 7) The communication system of claim 7, wherein the system is a time division duplex (TDD) system. ### Claim 9 (depends on 1) The communication system of claim 1 wherein the transmitter comprises a Node B. ### Claim 10 (depends on 1) The communication system of claim 1 wherein the receiver comprises User Equipment. ### Claim 11 (depends on 1) The communication system of claim 1, wherein the means for using the estimated signal reliability to effect transmission power control further comprises: means for comparing the estimated signal reliability to a target signal reliability metric; and means for using the target signal reliability metric comparison to effect transmission power control. ### Claim 12 (depends on 1) The communication system of claim 1, wherein the estimated signal reliability is a message error rate. ### Claim 13 (depends on 1) The communication system of claim 1, wherein the identification value associated with the last transmission successfully decoded at the receiver is a sequence number. ### Claim 14 A transmitter for use in a communication system having communication power control, the transmitter comprising: means for holding a value representative of the number of transmissions intended for a predetermined receiver; means for communicating the holding value to the receiver; and means for adjusting transmission power control by power control commands communicated by the receiver, wherein the power control commands are based upon the holding value. ### Claim 15 (depends on 14) The transmitter of claim 14, wherein the means for communicating the transmitter holding value comprises means for transmitting the transmitter holding value in a message to the receiver. ### Claim 16 (depends on 14) The transmitter of claim 14, wherein the transmissions are communicated on a high speed shared control channel. ### Claim 17 (depends on 14) The transmitter of claim 14, wherein the system is a Universal Mobile Telecommunications System (UMTS) system. ### Claim 18 (depends on 17) The transmitter of claim 17, wherein the system is a time division duplex (TDD) system. ### Claim 19 (depends on 14) The transmitter of claim 14 wherein the transmitter comprises a Node B. ### Claim 20 (depends on 14) An integrated circuit comprising the transmitter of claim 14. ### Claim 21 (depends on 14) The transmitter of claim 14, wherein the estimated signal reliability is a message error rate. ### Claim 22 (depends on 14) The transmitter of claim 14, wherein the identification value associated with the last transmission successfully decoded at the receiver is a sequence number. ### Claim 23 A receiver for use in a communication system having communication power control, the receiver comprising: means for holding an identification value associated with the last transmission successfully decoded; means for receiving a holding value associated with a transmission representative of the number of transmissions intended for the receiver; means for comparing the received holding value to the receiver identification value to estimate signal reliability; means for using the estimated signal reliability to effect transmission power control. ### Claim 24 (depends on 23) The receiver of claim 23, wherein the means for using the estimated signal reliability to effect transmission power control further comprises: means for estimating a signal quality; means for comparing the estimated signal quality to a signal quality target; means for effecting transmission power control based on the comparison of the estimated signal quality to the signal quality target; and means for adjusting the signal quality target based on the estimated signal reliability. ### Claim 25 (depends on 24) The receiver of claim 24, wherein the estimated signal quality is a signal-to interference ratio (SIR), and wherein the signal quality target is a SIR target. ### Claim 26 (depends on 23) The receiver of claim 23, wherein the means for using the estimated signal reliability to effect transmission power control comprises means for adjusting up/down commands of a transmission power control. ### Claim 27 (depends on 16) The receiver of claim 16, wherein the transmissions are communicated on a high speed shared control channel. ### Claim 28 (depends on 23) The receiver of claim 23, wherein the system is a Universal Mobile Telecommunications System (UMTS) system. ### Claim 29 (depends on 28) The receiver of claim 28, wherein the system is a time division duplex (TDD) system. ### Claim 30 (depends on 23) The receiver of claim 23 wherein the receiver comprises User Equipment. ### Claim 31 (depends on 23) An integrated circuit comprising the receiver of claim 23. ### Claim 32 (depends on 23) The receiver of claim 23, wherein the means for using the estimated signal reliability to effect transmission power control farther comprises: means for comparing the estimated signal reliability to a target signal reliability metric; and means for using the target signal reliability metric comparison to effect transmission power control. ### Claim 33 (depends on 23) The receiver of claim 23, wherein the estimated signal reliability is a message error rate. ### Claim 34 (depends on 23) The receiver of claim 23, wherein the identification value associated with the last transmission successfully decoded is a sequence number. ### Claim 35 A method for power control in a communication system, the method comprising: storing a value representative of the number of transmissions intended for the receiver at a transmitter; receiving the holding value from a transmitter; holding an identification value associated with the last transmission successfully decoded at the receiver; comparing the received holding value to the receiver identification value to estimate signal reliability; and using the estimated signal reliability to effect transmission power control. ### Claim 36 (depends on 35) The method of claim 35, wherein receiving the transmitter holding value comprises receiving the transmitter holding value in a message to the receiver. ### Claim 37 (depends on 35) The method of claim 35, wherein using the estimated signal reliability to effect transmission power control further comprises: estimating a signal quality; comparing the estimated signal quality to a signal quality target; effecting transmission power control based on the comparison of the estimated signal quality to the signal quality target; and adjusting the signal quality target based on the estimated signal reliability. ### Claim 38 (depends on 37) The method of claim 37, wherein the estimated signal quality is a signal-to interference ratio (SIR), and wherein the signal quality target is a SIR target. ### Claim 39 (depends on 35) The method of claim 35, wherein using the estimated signal reliability to effect transmission power control comprises adjusting up/down commands of a transmission power control. ### Claim 40 (depends on 35) The method of claim 35, wherein the transmissions are received on a high speed shared control channel. ### Claim 41 (depends on 35) The method of claim 35, wherein the system is a Universal Mobile Telecommunications System (UMTS) system. ### Claim 42 (depends on 41) The method of claim 41, wherein the system is a time division duplex (TDD) system. ### Claim 43 (depends on 35) The method of claim 35 wherein the transmitter comprises a Node B. ### Claim 44 (depends on 35) The method of claim 35 wherein the receiver comprises User Equipment. ### Claim 45 (depends on 35) A computer-readable medium encoded with computer instructions for performing the method of power control in a communication system of claim 35. ### Claim 46 (depends on 35) The method of claim 35, wherein using the estimated signal reliability to effect transmission power control further comprises: comparing the estimated signal reliability to a target signal reliability metric; and using the target signal reliability metric comparison to effect transmission power control. ### Claim 47 (depends on 35) The method of claim 35, wherein the estimated signal reliability is a message error rate. ### Claim 48 (depends on 35) The method of claim 35, wherein the identification value associated with the last transmission successfully decoded is a sequence number.