# US 9,521,688 B2 · Signaling for uplink sounding > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,521,688 B2 - Document ID: US9521688B2 - Status: Granted - Kind: B2 - Application number: 14/386,861 - Filed: 2012-04-19 - Published: 2015-02-26 - Granted: 2016-12-13 - Earliest claimed: 2012-04-19 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Haochuan Zhang; Shaohua Li; Zhenshan Zhao - Inventors: Haochuan Zhang; Shaohua Li; Zhenshan Zhao - Web page: https://patentgrep.com/patent/US9521688B2 ## CPC - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04L 5/0023: {Time-frequency-space} - H04L 5/0035: {Resource allocation in a cooperative multipoint environment} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A method in a transmitting node in a wireless communication system for instructing a user terminal to perform uplink sounding is provided, said method comprising: generating an unlink grant in a downlink control information (DCI) for instructing the user terminal to transmit an uplink channel with only a reference signal; and transmitting the DCI with said uplink grant to the user terminal, and wherein said uplink grant is configured as a redundant state within the DCI. A method in a receiving node in a wireless communication system for performing uplink sounding is also provided. ## Claims ### Claim 1 A method in a transmitting node in a wireless communication system for instructing a user terminal to perform uplink sounding, said method comprising: generating, by the transmitting node, an uplink grant in a downlink control information (DCI) for instructing the user terminal to transmit an uplink channel with only a reference signal; and transmitting, by the transmitting node, the DCI with the uplink grant to the user terminal, wherein: the uplink grant is configured as a redundant state within the DCI; and the redundant state is able to indicate the disabled transmission of data blocks and control signaling on the uplink. ### Claim 2 (depends on 1) The method according to claim 1, wherein the DCI is in DCI format-4, and the redundant state is the configuration of DCI format-4 indicating the disabled transmission of the transport blocks and the control state information (CSI) report on a physical uplink shared channel (PUSCH). ### Claim 3 (depends on 2) The method according to claim 2, wherein said configuration of DCI format-4 including a 1-bit CSI request field set to ‘0’ or a 2-bit CSI request field set to ‘00’. ### Claim 4 (depends on 3) The method according to claim 3, wherein said configuration of DCI format-4 including the modulation and coding scheme (MCS) index set to 28 if more than one physical resource blocks (PRB) are allocated, or the MCS set to 0 if only one PRB is allocated. ### Claim 5 (depends on 4) The method according to claim 4, wherein said configuration of DCI format-4 further including the transmitted precoding matrix indicator (TPMI) set to 0 and the layer number field set to the number of antenna ports if the number of antenna ports for the PUSCH equals 2 or 4 to enable the transmission of non-precoded PUSCH. ### Claim 6 (depends on 4) The method according to claim 4, wherein said configuration of DCI format-4 further including the transmitted precoding matrix indicator (TPMI) set to 4 or 5 and the layer number field set to 1 when the number of antenna ports for the PUSCH equals to 2 to enable the transmission of PUSCH transmission with antenna selection. ### Claim 7 A method in a receiving node in a wireless communication system for performing uplink sounding, said method comprising: receiving, by the receiving node, a downlink control information (DCI) with an uplink grant from the network node; and enabling, by the receiving node, the transmission of an uplink channel with only a reference signal to the network node based on the uplink grant, wherein: the uplink grant is configured as a redundant state within the DCI; and the redundant state is able to indicate the disabled transmission of all the data blocks and control signaling on the uplink. ### Claim 8 (depends on 7) The method according to claim 7, wherein the DCI is in DCI format-4, and the redundant state is the configuration of DCI format-4 indicating the disabled transmission of all the transport blocks and the control state information (CSI) report on a physical uplink shared channel (PUSCH). ### Claim 9 (depends on 8) The method according to claim 8, wherein said configuration of DCI format-4 including a 1-bit CSI request field set to ‘0’ or a 2-bit CSI request field set to ‘00’. ### Claim 10 (depends on 9) The method according to claim 9, wherein said configuration of DCI format-4 including the modulation and coding scheme (MCS) index set to 28 if more than one physical resource blocks (PRB) are allocated, or the MCS set to 0 if only one PRB is allocated. ### Claim 11 (depends on 9) The method according to claim 9, further comprising enabling the transmission of non-precoded PUSCH if said configuration of DCI format-4 further including the transmitted precoding matrix indicator (TPMI) set to 0 and the layer number field set to the number of antenna ports if the number of antenna ports for the PUSCH equals 2 or 4. ### Claim 12 (depends on 9) The method according to claim 9, further comprising enabling the PUSCH transmission with antenna selection if said configuration of DCI format-4 further including the transmitted precoding matrix indicator (TPMI) set to 4 or 5 and the layer number field set to 1 when the number of antenna ports for the PUSCH equals to 2. ### Claim 13 A network node in a wireless communication system operative to instruct a user terminal to perform uplink sounding, comprising: a processing unit for generating an uplink grant in a downlink control information (DCI) for instructing the user terminal to transmit an uplink channel with only a reference signal; and a transmitting unit for transmitting the DCI with said uplink grant to the user terminal; wherein: the uplink grant is configured as a redundant state within the DCI; and the redundant state is able to indicate the disabled transmission of data blocks and control signaling on the uplink. ### Claim 14 A user terminal in a wireless communication system operative to perform uplink sounding instructed by a network node, comprising: a receiving unit for receiving a downlink control information (DCI) with an uplink grant from the network node; and a processing unit for configuring the user terminal to transmit the uplink channel with only a reference signal according to the uplink grant, wherein: the uplink grant is configured as a redundant state within the DCI; the redundant state is able to indicate the disabled transmission of data blocks and control signaling on the uplink. ### Claim 15 (depends on 14) A user terminal according to claim 14, wherein the user terminal has relaying functionality.