# US 2014/0153423 A1 · Method for handover of terminal using multi-connection in cellular communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0153423 A1 - Document ID: US20140153423A1 - Status: Published application - Kind: A1 - Application number: 13/974,951 - Filed: 2013-08-23 - Published: 2014-06-05 - Earliest claimed: 2012-12-05 - Assignees: Electronics and Telecommunications Research Institute - Applicants: Electronics and Telecommunications Research Institute - Inventors: Jae Sheung SHIN; Sook Yang KANG; Eun Ah KIM; Hyun Seo PARK; Sung Min OH; Ae Soon PARK; Pyeong Jung SONG - Web page: https://patentgrep.com/patent/US20140153423A1 ## CPC - H04W 36/18: for allowing seamless reselection, e.g. soft reselection - H04W 36/083: {wherein at least one of the access points is a moving node} - H04W 36/085: {involving beams of access points} - H04W 36/304: {due to measured or perceived resources with higher communication quality} - H04W 84/047: {using dedicated repeater stations} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A method for handover of a terminal using a multi-connection in a cellular communication system is disclosed. The method for handover according to the present invention includes a multi-connection setting procedure of setting a connection to a second base station in addition to a connection to a first base station according to movement of a terminal in a direction from the first base station to the second base station, and a connection release procedure of releasing the connection to the first base station. Specifically, the present invention may be applied in a multi-beam management environment of super high frequency (SHF) and extremely high frequency (EHF) bandwidths, and may obtain an effect of decreasing signaling overhead and process latency of a conventional handover method. ## Claims ### Claim 1 A method for handover of a terminal in a multi-beam environment, the method comprising: (a) measuring quality of a beam received from a second base station by a terminal receiving service of a first base station; (b) performing random access to the second base station when the quality of the beam received from the second base station is equal to or greater than a predetermined critical value; (c) setting a connection to the second base station in addition to a connection to the first base station when the random access to the second base station is successful; and (e) transmitting/receiving data with the first terminal and the second terminal ### Claim 2 (depends on 1) The method of claim 1, wherein at least one of the first base station and the second base station is a relay base station. ### Claim 3 (depends on 1) The method of claim 1, wherein the multi-beam environment is operated in a super high frequency (SHF) or extremely high frequency (EHF) bandwidth. ### Claim 4 (depends on 1) The method of claim 1, wherein, in operation (c), the setting of the connection to the second base station is processed at the lowest branch node to which the first base station and the second base station are both connected. ### Claim 5 (depends on 4) The method of claim 4, Wherein, when the first base station and the second base station are relay base stations connected to the same macro base station, the lowest branch node is the macro base station. ### Claim 6 (depends on 4) The method of claim 4, wherein the lowest branch node is a gateway device (a serving gateway (SGW)), when the first base station and the second base station are macro base stations. ### Claim 7 (depends on 1) The method of claim 1, wherein, in operation (e), the terminal doubly transmits/receives the same data with the first base station and the second base station. ### Claim 8 (depends on 1) The method of claim 1, wherein, in operation (e), the terminal transmits/receives data different from data transmitted and received with the first base station, with the second base station. ### Claim 9 A method for handover of a terminal simultaneously connected to a first base station and a second base station in a multi-beam environment, the method comprising: (a) measuring quality of a beam received from a first base station; (b) performing a connection release procedure with the first base station while maintaining a connection to the second base station when the quality of the beam received from the first base station is equal to or less than a predetermined critical value; and (c) transmitting/receiving data with the second base station. ### Claim 10 (depends on 9) The method of claim 9, wherein at least one of the first base station and the second base station is a relay base station. ### Claim 11 (depends on 9) The method of claim 9, wherein the multi-beam environment is operated in a super high frequency (SHF) or extremely high frequency (EHF) bandwidth. ### Claim 12 (depends on 9) The method of claim 9, wherein, in operation (b), the release of the connection to the first base station is processed at the lowest branch node to which the first base station and the second base station are both connected. ### Claim 13 (depends on 12) The method of claim 12, Wherein, when the first base station and the second base station are relay base stations connected to the same macro base station, the lowest branch node is the macro base station. ### Claim 14 (depends on 12) The method of claim 12, wherein the lowest branch node is a gateway device (a serving gateway (SGW)) when the first base station and the second base station are a macro base station.