# US 10,122,441 B2 · Method of utilizing a relay node in 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 10,122,441 B2 - Document ID: US10122441B2 - Status: Granted - Kind: B2 - Application number: 15/465,245 - Filed: 2017-03-21 - Published: 2017-07-27 - Granted: 2018-11-06 - Earliest claimed: 2009-04-21 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Sung-Duck Chun; Seung-June Yi; Sung-Hoon Jung; Sung-Jun Park - Web page: https://patentgrep.com/patent/US10122441B2 ## CPC - H04B 7/2606: {Arrangements for base station coverage control, e.g. by using relays in tunnels} - H04L 1/1614: {using bitmaps} - H04L 1/1635: {Cumulative acknowledgement, i.e. the acknowledgement message applying to all previous messages} - H04W 76/12: Setup of transport tunnels - H04L 2001/0097: {Relays} - H04W 72/27: between access points - H04W 76/27: Transitions between radio resource control [RRC] states - H04W 84/047: {using dedicated repeater stations} - H04B: TRANSMISSION - 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 wireless communication system and a user equipment (UE) providing wireless communication services, and more particularly, a method of preventing transmission error of data while maintaining its security and a method of controlling an access of a Relay Node (RN) to a Donor eNB (DeNB) and an access of the UE to the RN during a process of transmitting and receiving user data when the RN as a radio network node is connected to the DeNB in an Evolved Universal Mobile Telecommunications System (E-UMTS), a Long Term Evolution (LTE) system, and a LTE-Advanced (LTE-A) system that have evolved from a Universal Mobile Telecommunications System (UMTS). ## Claims ### Claim 1 A method of establishing a Radio Resource Control (RRC) connection in a wireless communication system, the method comprising: transmitting, from a Relay Node (RN), a RRC connection request message to a Donor eNB (DeNB); receiving, by the RN, a RRC connection setup message from the DeNB in response to the transmitted RRC connection request message; and transmitting, from the RN, a RRC connection setup complete message to the DeNB after the reception of the RRC connection setup message, wherein the steps of transmitting the RRC connection request message, receiving the RRC connection setup message, and the transmitting the RRC connection setup complete message are performed during a RRC connection establishment, and wherein the RRC connection setup complete message indicates that the RRC connection is for the RN only when the RRC connection setup complete message includes information indicating that the RRC connection is for the RN. ### Claim 2 (depends on 1) The method of claim 1, wherein, when a User Equipment (UE) receives a Packet Data Convergence Protocol (PDCP) Protocol Data Unit (PDU), a ciphering key is used to decipher the received PDCP PDU. ### Claim 3 (depends on 1) The method of claim 1, wherein the RRC connection setup complete message is set by a User Equipment (UE). ### Claim 4 (depends on 1) The method of claim 1, wherein the RRC connection setup complete message is used to confirm a successful completion of the RRC connection establishment. ### Claim 5 (depends on 1) The method of claim 1, wherein the information indicating that the RRC connection is for the RN includes an identity (ID) of the RN. ### Claim 6 A method of establishing a Radio Resource Control (RRC) connection in a wireless communication system, the method comprising: transmitting, from a mobile terminal, a RRC connection request message to a base station; receiving, by the mobile terminal, a RRC connection setup message from the base station in response to the transmitted RRC connection request message; and transmitting, from the mobile terminal, a RRC connection setup complete message to the base station after the reception of the RRC connection setup message by the mobile terminal, wherein the steps of transmitting the RRC connection request message, receiving the RRC connection setup message, and the transmitting the RRC connection setup complete message are performed during a RRC connection establishment, and wherein the RRC connection setup complete message indicates that the RRC connection is for the RN only when the RRC connection setup complete message includes information indicating that the RRC connection is for the RN. ### Claim 7 (depends on 6) The method of claim 6, wherein, when the mobile terminal receives a Packet Data Convergence Protocol (PDCP) Protocol Data Unit (PDU), a ciphering key is used to decipher the received PDCP PDU. ### Claim 8 (depends on 6) The method of claim 6, wherein the RRC connection setup complete message is configured by the mobile terminal. ### Claim 9 (depends on 6) The method of claim 6, wherein the RRC connection setup complete message is used to confirm a successful completion of the RRC connection establishment. ### Claim 10 (depends on 6) The method of claim 6, wherein the information indicating that the RRC connection is for the RN includes an identity (ID) of the RN. ### Claim 11 An apparatus for establishing a Radio Resource Control (RRC) connection in a wireless communication system, the apparatus comprising: a memory; a transceiver; and a processor, the processor configured to: transmit, from a mobile terminal, a RRC connection request message to a base station; receive a RRC connection setup message from the base station in response to the transmitted RRC connection request message; and transmit a RRC connection setup complete message to the base station after the reception of the RRC connection setup message by the mobile terminal, wherein the RRC connection request message is transmitted, the RRC connection setup message is received, and the RRC connection setup complete message is transmitted during a RRC connection establishment, and wherein the RRC connection setup complete message indicates that the RRC connection is for the RN only when the RRC connection setup complete message includes information indicating that the RRC connection is for the RN. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein, when the mobile terminal receives a Packet Data Convergence Protocol (PDCP) Protocol Data Unit (PDU), a ciphering key is used to decipher the received PDCP PDU. ### Claim 13 (depends on 11) The apparatus of claim 11, wherein the RRC connection setup complete message is configured by the mobile terminal. ### Claim 14 (depends on 11) The apparatus of claim 11, wherein the RRC connection setup complete message is used to confirm a successful completion of the RRC connection establishment. ### Claim 15 (depends on 11) The apparatus of claim 11, wherein the information indicating that the RRC connection is for the RN includes an identity (ID) of the RN.