# US 2019/0173639 A1 · Method, network device and terminal device for transmitting reference signal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0173639 A1 - Document ID: US20190173639A1 - Status: Published application - Kind: A1 - Application number: 16/215,176 - Filed: 2018-12-10 - Published: 2019-06-06 - Earliest claimed: 2016-09-05 - Assignees: Guangdong Oppo Mobile Telecommunication Corp., Ltd. - Applicants: Guangdong Oppo Mobile Telecommunication Corp, Ltd. - Inventors: Hai TANG - Web page: https://patentgrep.com/patent/US20190173639A1 ## CPC - 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 27/2605: {Symbol extensions, e.g. Zero Tail, Unique Word [UW]} - H04W 72/04: Wireless resource allocation - H04W 72/044: based on the type of the allocated resource - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04B 7/024: Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 5/0092: {Indication of how the channel is divided} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - 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) - H04B: TRANSMISSION ## Abstract Disclosed are a method, a network device, and a terminal device for transmitting a reference signal. The method includes: determining, by the network device of the first cell, a first resource element corresponding to the first cell, and at least one second resource element corresponding to at least one second cell; determining, by the network device, a resource element with the largest time domain resource and a resource element with the largest frequency domain resource among the first resource element and the at least one second resource element; determining, by the network device, a reference signal resource according to the resource element with the largest time domain resource and the resource element with the largest frequency domain resource; and transmitting, by the network device, a reference signal to a terminal device on the reference signal resource. ## Claims ### Claim 1 A method for transmitting a reference signal, comprising: determining, by a network device of a first cell, a first resource element corresponding to the first cell, and at least one second resource element corresponding to at least one second cell, wherein the first resource element has a time-frequency resource size different from that of the at least one second resource element; determining, by the network device, a resource element with a largest time domain resource and a resource element with a largest frequency domain resource among the first resource element and the at least one second resource element; determining, by the network device, a reference signal resource according to the resource element with the largest time domain resource and the resource element with the largest frequency domain resource; and transmitting, by the network device, a reference signal to a terminal device on the reference signal resource. ### Claim 2 (depends on 1) The method according to claim 1, wherein the time domain resource size of the first resource element is equal to a sum of a symbol length and a cyclic prefix length in a numerology used by the first cell, and/or the frequency domain resource size of the first resource element is equal to a subcarrier spacing in the numerology used by the first cell; and the time domain resource size of each of the at least one second resource element is equal to a sum of a symbol length and a cyclic prefix length in a numerology used by a cell corresponding to the each of the at least one second resource element, and/or the frequency domain resource size of each of the at least one second resource element is equal to a subcarrier spacing in the numerology used by the cell corresponding to the each of the at least one second resource element. ### Claim 3 (depends on 1) The method according to claim 1, wherein the determining, by the network device, a reference signal resource according to the resource element with a largest time domain resource and the resource element with a largest frequency domain resource comprises: determining, by the network device, the time domain resource size of the resource element with the largest time domain resource to be the time domain resource size of the reference signal resource, and the frequency domain resource size of the resource element with the largest frequency domain resource to be the frequency domain resource size of the reference signal resource. ### Claim 4 (depends on 1) The method according to claim 1, further comprising: determining, by the network device, a resource parameter corresponding to the first resource element, the resource parameter comprising: a ratio of the time domain resource size of the reference signal resource to the time domain resource size of the first resource element, and a ratio of the frequency domain resource size of the reference signal resource to the frequency domain resource size of the first resource element; and transmitting, by the network device, the resource parameter to the terminal device. ### Claim 5 A method for transmitting a reference signal, comprising: determining, by a terminal device, a first resource element corresponding to a first cell; determining, by the terminal device, a reference signal resource according to the first resource element, wherein a time domain resource size of the reference signal resource is equal to the time domain resource size of a largest time domain resource among the first resource element and at least one second resource element, or equal to an even multiple of the time domain resource size of the resource element with the largest time domain resource; a frequency domain resource size of the reference signal resource is equal to the frequency domain resource size of a largest frequency domain resource among the first resource element and at least one second resource element, or equal to an even multiple of the frequency domain resource size of the resource element with the largest frequency domain resource, wherein the at least one second resource element is a resource element corresponding to at least one second cell; and receiving, by the terminal device, a reference signal transmitted on the reference signal resource from a network device in the first cell. ### Claim 6 (depends on 5) The method according to claim 5, wherein the time domain resource size of the first resource element is equal to a sum of a symbol length and a cyclic prefix length in a numerology used by the first cell, and/or the frequency domain resource size of the first resource element is equal to a subcarrier spacing in the numerology used by the first cell; and the time domain resource size of each of the at least one second resource element is equal to a sum of a symbol length and a cyclic prefix length in a numerology used by a cell corresponding to the each of the at least one second resource element, and/or the frequency domain resource size of each of the at least one second resource element is equal to a subcarrier spacing in the numerology used by the cell corresponding to the each of the at least one second resource element. ### Claim 7 (depends on 5) The method according to claim 5, wherein before the determining, by the terminal device, a reference signal resource according to the first resource element, the method further comprises: receiving, by the terminal device, a resource parameter corresponding to the first resource element from the network device, the resource parameter comprising: a first ratio of the time domain resource size of the reference signal resource to the time domain resource size of the first resource element, and a second ratio of the frequency domain resource size of the reference signal resource to the frequency domain resource size of the first resource element; and the determining, by the terminal device, a reference signal resource according to the first resource element comprises: determining, by the terminal device, a product of the time domain resource size of the first resource element multiplying the first ratio to be the time domain resource size of the reference signal resource, and a product of the frequency domain resource size of the first resource element multiplying the second ratio to be the frequency domain resource size of the reference signal resource. ### Claim 8 (depends on 5) The method according to claim 5, wherein before the determining, by a terminal device, a first resource element corresponding to a first cell, the method further comprises: receiving, by the terminal device, information about the time-frequency resource of the at least one second resource element from the network device, wherein the determining, by the terminal device, a reference signal resource according to the first resource element comprises: determining, by the terminal device, a time domain resource size of the resource element with the largest time domain resource, and the frequency domain resource size of the resource element with the largest frequency domain resource among the first resource element and the at least one second resource element; and determining, by the terminal device, the time domain resource size of the resource element with the largest time domain resource to be the time domain resource size of the reference signal resource, and the frequency domain resource size of the resource element with the largest frequency domain resource to be the frequency domain resource size of the reference signal resource. ### Claim 9 (depends on 5) The method according to claim 5, further comprising: receiving, by the terminal device and from the network device, configuration information comprising a distribution period of the reference signal resource in time domain and a distribution period of the reference signal resource in frequency domain; and receiving, by the terminal device, a reference signal transmitted on the reference signal resource from the network device, comprising: receiving, by the terminal device, the reference signal transmitted from the network device on a plurality of the reference signal resources distributed periodically. ### Claim 10 (depends on 5) The method according to claim 5, wherein the reference signal comprises at least one of: a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), and a demodulation reference signal (DMRS). ### Claim 11 (depends on 5) The method according to claim 5, wherein the reference signal comprises a zero-power reference signal or a non-zero-power reference signal. ### Claim 12 (depends on 5) The method according to claim 5, wherein the method is applied to coordinated multiple points (CoMP), and the second cell is neighboring to the first cell. ### Claim 13 A terminal device, comprises a processor, a receiver and a memory storing instructions thereon, the processor when executing the instructions, being configured to: determine a first resource element corresponding to a first cell; determine a reference signal resource according to the first resource element, wherein a time domain resource size of the reference signal resource is equal to the time domain resource size of a largest time domain resource among the first resource element and at least one second resource element, or equal to an even multiple of the time domain resource size of the resource element with the largest time domain resource; a frequency domain resource size of the reference signal resource is equal to the frequency domain resource size of a largest frequency domain resource among the first resource element and at least one second resource element, or equal to an even multiple of the frequency domain resource size of the resource element with the largest frequency domain resource, wherein the at least one second resource element is a resource element corresponding to at least one second cell; and the receiver is configured to receive a reference signal transmitted on the reference signal resource from a network device in the first cell. ### Claim 14 (depends on 13) The terminal device according to claim 13, wherein the time domain resource size of the first resource element is equal to a sum of a symbol length and a cyclic prefix length in a numerology used by the first cell, and/or the frequency domain resource size of the first resource element is equal to a subcarrier spacing in the numerology used by the first cell; and the time domain resource size of each of the at least one second resource element is equal to a sum of a symbol length and a cyclic prefix length in a numerology used by a cell corresponding to the each of the at least one second resource element, and/or the frequency domain resource size of each of the at least one second resource element is equal to a subcarrier spacing in the numerology used by the cell corresponding to the each of the at least one second resource element. ### Claim 15 (depends on 13) The terminal device according to claim 13, wherein before the processor determines a reference signal resource according to the first resource element, the receiver is further configured to: receive a resource parameter corresponding to the first resource element from the network device, the resource parameter comprising: a first ratio of the time domain resource size of the reference signal resource to the time domain resource size of the first resource element, and a second ratio of the frequency domain resource size of the reference signal resource to the frequency domain resource size of the first resource element; and the processor is specifically configured to: determine a product of the time domain resource size of the first resource element multiplying the first ratio to be the time domain resource size of the reference signal resource, and a product of the frequency domain resource size of the first resource element multiplying the second ratio to be the frequency domain resource size of the reference signal resource. ### Claim 16 (depends on 13) The terminal device according to claim 13, wherein before the processor determines a first resource element corresponding to the first cell, the receiver is further configured to: receive information about the time-frequency resource of the at least one second resource element from the network device, wherein the processor is specifically configured to: determine a time domain resource size of the resource element with the largest time domain resource, and the frequency domain resource size of the resource element with the largest frequency domain resource among the first resource element and the at least one second resource element; and determine the time domain resource size of the resource element with the largest time domain resource to be the time domain resource size of the reference signal resource, and the frequency domain resource size of the resource element with the largest frequency domain resource to be the frequency domain resource size of the reference signal resource. ### Claim 17 (depends on 13) The terminal device according to claim 13, wherein the receiver is further configured to: receive, from the network device, configuration information comprising a distribution period of the reference signal resource in time domain and a distribution period of the reference signal resource in frequency domain; and receive the reference signal transmitted from the network device on a plurality of the reference signal resources distributed periodically. ### Claim 18 (depends on 13) The terminal device according to claim 13, wherein the reference signal comprises at least one of: a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), and a demodulation reference signal (DMRS). ### Claim 19 (depends on 13) The terminal device according to claim 13, wherein the reference signal comprises a zero-power reference signal or a non-zero-power reference signal. ### Claim 20 (depends on 13) The terminal device according to claim 13, wherein the terminal device is applied in coordinated multiple points (CoMP), and the second cell is neighboring to the first cell.