# US 2014/0192727 A1 · Methods and arrangements in a wireless communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0192727 A1 - Document ID: US20140192727A1 - Status: Published application - Kind: A1 - Application number: 14/007,967 - Filed: 2011-03-30 - Published: 2014-07-10 - Earliest claimed: 2011-03-30 - Assignees: Telefonaktiebolaget L M Ericsson (publ) - Inventors: Jinhua Liu; Muhammad Kazmi; Qingyu Miao - Web page: https://patentgrep.com/patent/US20140192727A1 ## CPC - H04B 7/0619: {using feedback from receiving side (feedback signaling for adaptive modulation/coding H04L1/0001)} - H04B 7/0617: {for beam forming} - H04B 7/0671: {using different delays between antennas} - H04B 7/0673: {using feedback from receiving side} - H04W 28/18: Negotiating wireless communication parameters - H04W 52/04: Transmission power control [TPC] - H04W 52/06: TPC algorithms - H04W 52/221: {using past power control commands} - H04W 56/0065: {using measurement of signal travel time} - H04W 52/08: Closed loop power control - H04W 52/10: Open loop power control - H04W 88/02: Terminal devices - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Method and arrangement in a user equipment for adjusting signals transmitted in uplink to a network node based on a feedback value received from the network node. The method includes transmitting a signal, to be received by the network node. A feedback signal is received from the network node, providing feedback on the transmitted signal. A value of a time delay of the received feedback signal is obtained. Signals transmitted in the uplink are adjusted according to the received feedback signal to compensate for the obtained time delay value of the received feedback signal. Related methods and arrangements in a network node are presented. ## Claims ### Claim at position 1 -28. (canceled) ### Claim 29 A method in a user equipment for adjusting signals transmitted in uplink to a network node, based on a feedback value received from the network node, the method comprising: transmitting a signal, to be received by the network node, receiving a feedback signal from the network node that provides feedback on the transmitted signal, obtaining a value of a time delay of the received feedback signal, and adjusting signals transmitted in the uplink based on the value of the time delay of the feedback signal to compensate for the obtained time delay value of the received feedback signal. ### Claim 30 (depends on 29) The method according to claim 29, wherein the time delay value of the received feedback signal is the difference in time between the moment when the user equipment transmits the uplink signal and the moment when the user equipment receives the feedback signal from the network node. ### Claim 31 (depends on 29) The method according to claim 29, wherein obtaining the value of the time delay of the received feedback signal comprises: transmitting a signal in the uplink at a transmission power level associated with a feedback reference value, receiving a feedback value from the network node that provides feedback on the transmitted uplink signal, comparing the feedback reference value with the received feedback value, and responsive to the feedback reference value corresponding to the received feedback value, determining the value of a time delay of the received feedback signal to be the difference in time between the transmission of the uplink signal and the reception of the feedback value. ### Claim 32 (depends on 29) The method according to claim 29, wherein obtaining the value of the time delay of the received feedback signal comprises: transmitting a sequence of uplink signals over a control channel at different transmission power levels P=(p1, p2, . . . , pN) associated with a Transmit Power Control reference sequence TPC_ref=(r1, r2, . . . , rN), receiving, from the network node, a sequence of Transmit Power Control commands TPC_set=(TPC1, TPC2, . . . , TPCQ) such that Q>N, triggered by the transmitted sequence of uplink signals, calculating a correlation sequence C=(c0, c1, . . . , cQ-N) between TPC_ref and TPC_set such that c j = ∑ k = 1 N   ( a k · TPC j + k ) , and determining the value of the time delay of the received feedback signal to be the index of the largest element of the correlation sequence. ### Claim 33 (depends on 29) The method according to claim 29, wherein no transmission power adjustment is made at the user equipment due to any Transmit Power Control commands received from the network node during a period when the user equipment is obtaining the time delay value of the received feedback signal. ### Claim 34 (depends on 29) The method according to claim 29, wherein the obtaining of the value of the time delay of the received feedback signal is triggered by any of: a request received from the network node; a handover event; a certain time interval has passed since the previous time delay value was obtained; periodically, where the period is predetermined or configured by the network node; the user equipment is set into Open Loop Transmit Diversity mode, such as Open Loop Antenna Switching mode or Open Loop Beam Forming mode; signal processing delay for generation of Transmit Power Control commands in the network node is to be changed; active time of the user equipment in Open Loop Transmit Diversity mode is longer than a threshold time; a change of best uplink cell of the user equipment in Open Loop Transmit Diversity mode is made; user equipment speed is above a threshold over a time interval; and received signal quality in the uplink and/or in the downlink is worse than a threshold over a time interval. ### Claim 35 (depends on 32) The method according to claim 32, wherein the sequence of uplink signals to be transmitted at different transmission power levels associated with the reference sequence is pre-determined and stored in a memory of the user equipment. ### Claim 36 (depends on 32) The method according to claim 32, wherein the sequence of uplink signals to be transmitted at different transmission power levels associated with the reference sequence is configured by the network node. ### Claim 37 (depends on 29) The method according to claim 29, wherein obtaining the value of the time delay of the received feedback signal comprises receiving at least a component of the time delay value of the received feedback signal from the network node. ### Claim 38 (depends on 29) The method according to claim 29, wherein: the user equipment comprises at least two transmission antennas whereby one transmission antenna of the at least two transmission antennas is alternately used for uplink transmission while the other transmission antenna of the at least two transmission antennas is not used for uplink transmission at the same time, and wherein the user equipment is configured for uplink transmit diversity by Open Loop Antenna Switching, and wherein signals transmitted in the uplink are adjusted by selecting one transmission antenna of the at least two transmission antennas for the uplink transmission. ### Claim 39 (depends on 29) The method according to claim 29, wherein: the obtained time delay value is used, when adjusting the signals transmitted in the uplink, for determining if the received feedback signal is related to the uplink signal transmitted on the transmission antenna—used for uplink transmission, and wherein signals transmitted in the uplink are adjusted by selecting one transmission antenna of the at least two transmission antennas to be used for uplink transmission, based on the received feedback signal related to the transmission antenna used for uplink transmission. ### Claim 40 (depends on 29) The method according to claim 29, wherein: the user equipment comprises at least two transmission antennas, wherein uplink transmission is performed on the at least two transmission antennas, transmitting the same signal simultaneously by adjusting a phase difference between the signals transmitted by the at least two antennas, such that a beam of the transmitted signal is created in certain direction, the user equipment is configured for uplink transmit diversity by Open Loop Beam Forming, and signals transmitted in the uplink are adjusted by selecting beam direction or phase difference between the signals transmitted by the at least two transmission antennas. ### Claim 41 (depends on 40) The method according to claim 40, wherein: the obtained time delay value is used when adjusting signals transmitted in the uplink, for determining if the received feedback signal is related to the uplink signal transmitted at the currently used phase difference between the signals transmitted by the at least two transmission antennas, and signals transmitted in the uplink are adjusted by selecting beam direction, or phase difference, based on the received feedback signal related to the currently used phase difference between the signals transmitted by the at least two transmission antennas. ### Claim 42 (depends on 29) The method according to claim 29, wherein the signals transmitted in the uplink are adjusted by adjusting the transmission power of the user equipment according to a Transmit Power Control command, received from the network node, with compensation made for the obtained time delay value of the received feedback signal. ### Claim 43 An arrangement in a user equipment for adjusting signals transmitted in the uplink to a network node, based on a feedback value received from the network node, the arrangement comprising: a transmitter, configured to transmit a signal, to be received by the network node, a receiver, configured to receive a feedback signal from the network node, providing feedback on the transmitted signal, a processing circuit, configured to obtain a value of a time delay of the received feedback signal, and to adjust signals transmitted in the uplink based on the value of the time delay of the feedback signal, wherein compensation is made for the obtained time delay value of the received feedback signal. ### Claim 44 (depends on 43) The arrangement according to claim 43, further comprising: a memory configured to store a pre-determined sequence of uplink signals to be transmitted at different transmission power levels associated with a reference sequence. ### Claim 45 (depends on 43) The arrangement according to claim 43, further comprising: a first transmission antenna, and a second transmission antenna, which first and second transmission antennas are configured to operate in Open Loop Transmit Diversity mode, such as Open Loop Antenna Switching mode or Open Loop Beam Forming mode. ### Claim 46 A method in a network node for providing a value of a time delay of a feedback signal transmitted to a user equipment for adjustment of signals transmitted in the uplink by the user equipment, based on a feedback value provided by the network node, the method comprises: determining that the user equipment is to adjust signals transmitted in the uplink, based on the value of the time delay of the feedback signal, and transmitting a request to be received by the user equipment, triggering the user equipment to determine the time delay value of the feedback signal. ### Claim 47 (depends on 46) The method according to claim 46, further comprising: measuring at least a component of the time delay value of the feedback signal transmitted to the user equipment, and providing the measured time delay value of the feedback signal transmitted to the user equipment, or a component thereof, to the user equipment. ### Claim 48 An arrangement in a network node or providing a value of a time delay of a feedback signal transmitted to a user equipment for adjustment of signals transmitted in the uplink by the user equipment, based on a feedback value provided by the network node, the arrangement comprises: a processing circuit, configured to determine that the user equipment is to adjust signals transmitted in the uplink, based on the value of the time delay of the feedback signal, and a transmitter, configured to transmit a request to be received by the user equipment, triggering the user equipment to determine the time delay value of the feedback signal.