# US 9,439,173 B2 · Method and apparatus for transmitting data > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,439,173 B2 - Document ID: US9439173B2 - Status: Granted - Kind: B2 - Application number: 14/399,081 - Filed: 2013-05-06 - Published: 2015-04-23 - Granted: 2016-09-06 - Earliest claimed: 2012-05-06 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Yunjung Yi; Joonkui Ahn; Dongyoun Seo - Web page: https://patentgrep.com/patent/US9439173B2 ## CPC - H04L 27/2613: {Structure of the reference signals} - H04L 1/0025: {Transmission of mode-switching indication} - 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 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information} - H04W 72/04: Wireless resource allocation - H04L 1/1671: {the supervisory signal being transmitted together with control information} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 84/10: Small scale networks; Flat hierarchical networks - 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 The present invention relates to a method and apparatus for transmitting data. The method for a terminal to receive downlink data includes the steps of: receiving resource allocation information from a base station; and demodulating the downlink data transmitted through a sub-resource allocation unit allocated on the basis of the resource allocation information, wherein the sub-resource allocation unit is a plurality of resource units included in one resource allocation unit and the downlink data can be demodulated on the basis of a demodulation reference signal (DM_RS). ## Claims ### Claim 1 A method for a terminal to receive downlink data, the method comprising: receiving resource allocation information from a base station; and demodulating downlink data transmitted through a sub-resource allocation unit allocated based on the resource allocation information, wherein a resource allocation unit includes the sub-resource allocation unit and an additional sub-resource allocation unit, wherein the resource allocation unit is a physical resource block (PRB), wherein the PRB includes seven orthogonal frequency division multiplexing (OFDM) symbols and 12 subcarriers, wherein the sub-resource allocation unit includes a resource for a first demodulation-reference signal (DM-RS), wherein the additional sub-resource allocation unit includes a resource for a second DM-RS, wherein the first DM-RS is generated based on a first DM-RS sequence, wherein the second DM-RS is generated based on a second DM-RS sequence, wherein a pattern of the first DM-RS is determined based on the first DM-RS sequence, wherein a pattern of the second DM-RS is determined based on the second DM-RS sequence, and wherein an initial value of a pseudo random sequence for generating each of the first DM-RS sequence and the second DM-RS sequence is determined as follows: cinit=(└ns/2┘+1)·(2nID,iEPDCCH+1)·216+nSCIDEPDCCH+k, where nSCIDEPDCCH=2; nID,iEPDCCH is determined by an upper layer; ns is a slot index; and k is determined by an index of the sub-resource allocation unit when the initial value of the pseudo random sequence is for the first DM-RS and the k is determined by an index of the additional sub-resource allocation unit when the initial value of the pseudo random sequence is for the second DM-RS. ### Claim 2 (depends on 1) The method of claim 1, wherein the terminal supports 1.4 MHz of operating bandwidth. ### Claim 3 (depends on 2) The method of claim 2, wherein each of the sub-resource allocation unit and the additional sub-resource allocation unit is a resource unit divided based on OFDM symbols included in the resource allocation unit. ### Claim 4 A terminal for receiving downlink data in a wireless communication system, the terminal comprising: a radio frequency (RF) unit configured to transmit or receive a radio signal; and a processor operatively connected to the RF unit and configured to: receive resource allocation information from a base station, and demodulate downlink data transmitted through a sub-resource allocation unit allocated on the basis of the resource allocation information, wherein a resource allocation unit includes the sub-resource allocation unit and an additional sub-resource allocation unit, wherein the resource allocation unit is a physical resource block (PRB), wherein the PRB includes seven orthogonal frequency division multiplexing (OFDM) symbols and 12 subcarriers, wherein the sub-resource allocation unit includes a resource for a first demodulation-reference signal (DM-RS), wherein the additional sub-resource allocation unit includes a resource for a second DM-RS, wherein the first DM-RS is generated based on a first DM-RS sequence, wherein the second DM-RS is generated based on a second DM-RS sequence, wherein a pattern of the first DM-RS is determined based on the first DM-RS sequence, wherein a pattern of the second DM-RS is determined based on the second DM-RS sequence, and wherein an initial value of a pseudo random sequence for generating each of the first DM-RS sequence and the second DM-RS sequence is determined as follows: cinit=(└ns/2┘+1)·(2nID,iEPDCCH+1)·216+nSCIDEPDCCH+k, where nSCIDEPDCCH=2; nID,iEPDCCH is determined by an upper layer; ns is a slot index; and k is determined by an index of the sub-resource allocation unit when the initial value of the pseudo random sequence is for the first DM-RS and the k is determined by an index of the additional sub-resource allocation unit when the initial value of the pseudo random sequence is for the second DM-RS. ### Claim 5 (depends on 4) The terminal of claim 4, wherein the terminal supports 1.4 MHz of operating bandwidth. ### Claim 6 (depends on 5) The terminal of claim 5, wherein each of the sub-resource allocation unit and the additional sub-resource allocation unit is a resource unit divided based on OFDM symbols included in the resource allocation unit.