# US 2019/0379508 A1 · Method for performing channel sounding between terminals, network side device, and terminal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0379508 A1 - Document ID: US20190379508A1 - Status: Published application - Kind: A1 - Application number: 16/547,587 - Filed: 2019-08-22 - Published: 2019-12-12 - Earliest claimed: 2017-02-23 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Zhengzheng XIANG; Jiyong PANG; Hongjia SU - Web page: https://patentgrep.com/patent/US20190379508A1 ## CPC - H04L 27/2602: {Signal structure} - H04L 5/0033: {each allocating device acting autonomously, i.e. without negotiation with other allocating devices} - 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 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/0082: {at predetermined intervals} - H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information} - H04L 25/0224: {using sounding signals} - H04L 27/261: {Details of reference signals} - H04W 8/005: {Discovery of network devices, e.g. terminals} - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 72/121: for groups of terminals or users - H04W 76/14: Direct-mode setup - H04L 5/0069: {Allocation based on distance or geographical location} - H04W 4/70: Services for machine-to-machine communication [M2M] or machine type communication [MTC] - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Embodiments relate to the field of wireless communication technologies and provide a method for performing channel sounding, a network-side device, and a terminal. A first terminal sends a resource scheduling request to a network-side device when the first terminal starts a communication connection with a second terminal. The resource scheduling request carrying information about the second terminal requests the network-side device to allocate a transmission resource for channel sounding between the first terminal and the second terminal. The first terminal receives a sounding reference signal sent by the second terminal, and obtains information of a channel for communication between the first terminal and the second terminal. The method enables quick and effective channel sounding between terminals, thereby increasing communication efficiency between the terminals. ## Claims ### Claim 1 A method for performing channel sounding between terminals, comprising: sending, by a first terminal, a resource scheduling request to a network-side device when the first terminal starts a communication connection with a second terminal, wherein the resource scheduling request is configured to request the network-side device to allocate a transmission resource for channel sounding between the first terminal and the second terminal, and the resource scheduling request carries information about the second terminal; and receiving, by the first terminal, a sounding reference signal sent by the second terminal on the transmission resource allocated by the network-side device, and obtaining information about a communication channel between the first terminal and the second terminal. ### Claim 2 (depends on 1) The method according to claim 1, further comprising, after sending the resource scheduling request to the network-side device: receiving, by the first terminal, information about the transmission resource sent by the network-side device; and sending, by the first terminal, sounding control signaling on the transmission resource, wherein the sounding control signaling triggers the second terminal to send the sounding reference signal. ### Claim 3 (depends on 2) The method according to claim 2, wherein the transmission resource is a subframe comprising: a first part allocated to the first terminal for transmitting the sounding control signaling; a second part allocated to the second terminal for transmitting the sounding reference signal; and a guard interval disposed between the first part and the second part of the subframe. ### Claim 4 (depends on 2) The method according to claim 2, wherein the transmission resource comprises a first subframe and a second subframe, the first subframe being allocated to the first terminal for transmitting the sounding control signaling, the second subframe being allocated to the second terminal for transmitting the sounding reference signal, and the first subframe and the second subframe being different subframes. ### Claim 5 (depends on 2) The method according to claim 2, wherein the transmission resource is a slot or a mini-slot, and a number of symbols comprised in the mini-slot is less than a number of symbols comprised in the slot, and the slot or the mini-slot comprises a first symbol and a second symbol; the first symbol is allocated to the first terminal for transmitting the sounding control signaling; the second symbol is allocated to the second terminal for transmitting the sounding reference signal; and the first symbol and the second symbol are different symbols. ### Claim 6 (depends on 2) The method according to claim 2, wherein the sounding control signaling comprises a sounding trigger indication and a cell radio network temporary identifier of the second terminal. ### Claim 7 (depends on 2) The method according to claim 2, wherein the sounding control signaling is periodically sent. ### Claim 8 A method for performing channel sounding between terminals, the method comprising: receiving, by a network-side device, a resource scheduling request from a first terminal, wherein the resource scheduling request is configured to request the network-side device to allocate a transmission resource for channel sounding between the first terminal and a second terminal, and the resource scheduling request carries information about the second terminal; and allocating, by the network-side device, the transmission resource to the second terminal, wherein the transmission resource comprises a first transmission resource allocated to the second terminal for sending a sounding reference signal. ### Claim 9 (depends on 8) The method according to claim 8, wherein the transmission resource further comprises a second transmission resource allocated to the first terminal for sending sounding control signaling. ### Claim 10 (depends on 9) The method according to claim 9, wherein the transmission resource is a subframe comprising: a first part allocated to the first terminal for transmitting the sounding control signaling, and a second part allocated to the second terminal for transmitting the sounding reference signal; and a guard interval disposed between the first part and the second part of the subframe. ### Claim 11 (depends on 9) The method according to claim 9, wherein the transmission resource comprises at least a first subframe and a second subframe; the first subframe is used by the first terminal to transmit the sounding control signaling; the second subframe is used by the second terminal to transmit the sounding reference signal; and the first subframe and the second subframe are different subframes. ### Claim 12 (depends on 9) The method according to claim 9, wherein the transmission resource allocated by the network-side device is a slot or a mini-slot, a number of symbols comprised in the mini-slot is less than a number of symbols comprised in the slot, and the slot or the mini-slot comprises a first symbol and a second symbol; the first symbol is allocated to the first terminal for transmitting the sounding control signaling; the second symbol allocated to the second terminal for transmitting the sounding reference signal; and the first symbol and the second symbol are different symbols. ### Claim 13 A terminal, comprising: a transceiver configured to: send a resource scheduling request to a network-side device, wherein the resource scheduling request is used to request the network-side device to allocate a transmission resource used for channel sounding between the terminal and another terminal, and the resource scheduling request carries information about the another terminal; and receive a sounding reference signal sent by the another terminal on the transmission resource allocated by the network-side device; and a processor configured to obtain information about a communication channel between the terminal and the another terminal. ### Claim 14 (depends on 13) The terminal according to claim 13, wherein the transceiver is further configured to receive information about the transmission resource is sent by the network-side device; and the processor is further configured to instruct the transceiver to send sounding control signaling on the transmission resource, wherein the sounding control signaling is configured to trigger the another terminal to send the sounding reference signal. ### Claim 15 (depends on 14) The terminal according to claim 14, wherein the transmission resource is a subframe comprising: a first part allocated to a first terminal for transmitting the sounding control signaling; a second part allocated to a second terminal for transmitting the sounding reference signal; and a guard interval disposed between the first part and the second part of the subframe. ### Claim 16 (depends on 14) The terminal according to claim 14, wherein the transmission resource comprises a first subframe and a second subframe; the first subframe is allocated to the terminal for transmitting the sounding control signaling; the second subframe is allocated to the another terminal for transmitting the sounding reference signal; and the first subframe and the second subframe are different subframes. ### Claim 17 (depends on 14) The terminal according to claim 14, wherein the transmission resource is a slot or a mini-slot, a number of symbols comprised in the mini-slot is less than a number of symbols comprised in the slot, and the slot or the mini-slot comprises a first symbol and a second symbol; the first symbol is allocated to the terminal for transmitting the sounding control signaling; the second symbol is allocated to the another terminal for transmitting the sounding reference signal; and the first symbol and the second symbol are different symbols. ### Claim 18 (depends on 14) The terminal according to claim 14, wherein the sounding control signaling sent by the transceiver comprises a sounding trigger indication and a cell radio network temporary identifier of the another terminal. ### Claim 19 (depends on 14) The terminal according to claim 14, wherein the sounding control signaling is periodically sent.