# US 2015/0103784 A1 · Method and a system for beam coordination between base stations in wireless cellular systems and computer program thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2015/0103784 A1 - Document ID: US20150103784A1 - Status: Published application - Kind: A1 - Application number: 14/516,078 - Filed: 2014-10-16 - Published: 2015-04-16 - Earliest claimed: 2013-10-16 - Assignees: Telefonica, S.A. - Applicants: Telefonica, S.A. - Inventors: Javier LORCA HERNANDO - Web page: https://patentgrep.com/patent/US20150103784A1 ## CPC - H04L 5/0032: {Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation} - 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 - H04J 11/0056: {Inter-base station aspects} - H04W 72/541: using the level of interference - H04W 72/046: {the resource being in the space domain, e.g. beams} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) - 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 involving coordinating resources between a victim and an aggressor base station in massive MIMO systems, whereby only those specific beams involved in the interference scenario are coordinated in time and/or frequency domains without affecting other resources committed to other users as well as legacy users. Also disclosed is a system and computer program configured to implement the method. ## Claims ### Claim 1 A method for beam coordination between base stations in wireless cellular systems, wherein at least one user terminal connected to at least a first base station suffers interference from at least a second base station, said first and second base stations comprising advanced beamforming capabilities by means of including a large number of antennas, said beamforming capabilities conforming a radiation pattern towards connected users according to a discrete set of beamforming possibilities, the method being characterized in that comprises: a) transmitting, by each of said base stations, a corresponding encoded value known as beam indicator through a physical beam indicator channel to all the users terminals connected thereto, wherein said physical beam indicator channel characterizes the actual beam in use by said base stations for transmission towards a given user, wherein said beam indicator is different for each of said connected users terminals by means of exploiting the beamforming capabilities in the cell; b) creating, said at least one user terminal, a first interference report including at least the identity and the beam indicator of said second base station, wherein said identity is acquired by decoding a corresponding synchronization or broadcast channel; and wherein the beam indicator is obtained from decoding said physical beam indicator channel transmitted by said second base station; c) further sending, said user terminal, said first interference report to said first base station; d) creating, by at least said first base station, with said received first interference report a second interference report including at least information of said user terminal, of said second base station and of said obtained beam indicator, said second interference report being dynamically updated, for instance by adding or removing entries in the second interference report according to the receiving of said first interference report; and e) coordinating time and/or frequency resources, said first base station, between their own beam and the beam of said second base station identified in said second interference report, so that only beams causing interference are involved in the beam coordination process. ### Claim 2 (depends on 1) A method according to claim 1, comprising creating said first interference report of said step b) by all the user terminals connected to said first base station, said first interference report including information regarding the identity and the beam indicator of each interfering base station. ### Claim 3 (depends on 1) A method according to claim 1, wherein said second base station further comprises creating said second interference report based on the first interference report received from its connected users terminals. ### Claim 4 (depends on 1) A method according to claim 1, wherein said first interference report is sent either periodically every certain period of time or upon request of said first base station. ### Claim 5 (depends on 1) A method according to claim 1 wherein said first interference report comprises a Layer-3 control message. ### Claim 6 (depends on 5) A method according to claim 5, wherein said Layer-3 control message is sent as a single message or as part of an existing control message. ### Claim 7 (depends on 1) A method according to claim 1, wherein said second interference report is created by said first base station in the form of a table. ### Claim 8 (depends on 7) A method according to claim 7, wherein said table comprises entries with the identified interference relationships, said entries containing for an interfered user and an interfering base station the related beam indicator. ### Claim 9 (depends on 1) A method according to claim 1, wherein said beam indicator comprises at least a number or a set of coordinates in a coordinate system. ### Claim 10 (depends on 9) A method according to claim 9, wherein said beam indicator is protected with a channel encoder for improved detection and scrambled with a sequence dependent on the cell identity for cell differentiation. ### Claim 11 (depends on 1) A method according to claim 1, wherein said dynamically updating comprises adding or removing entries in the second interference report. ### Claim 12 A system for beam coordination between base stations in wireless cellular systems, comprising: at least one user terminal; at least a first base station; and at least second base station; wherein said at least one user terminal is connected to said first base station and suffers interference from said second base station, said first and second base stations being equipped with a large number of antennas so that having advanced beamforming capabilities, characterized in that: said base stations comprise first means configured for transmitting a corresponding encoded value known as beam indicator through a physical beam indicator channel to all the users terminals connected thereto, said physical beam indicator channel characterizing the actual beam in use by said base stations for transmission towards a given user, said beam indicator being different for each of said connected users terminals by means of exploiting the beamforming capabilities in the cell; said at least one user terminal comprises: first means configured for creating a first interference report including at least the identity and the beam indicator of said second base station; and second means configured for sending said first interference report to said first base station; and said first base station further comprises: second means configured for creating with said received first interference report a second interference report that includes at least information of said user terminal and of said second base station and its beam indicator, said second interference report being dynamically updated according to the receiving of said first interference report; and third means configured for coordinating time and/or frequency resources between their own beam and the beam of said second base station identified in said second interference report, so that only beams causing interference are involved in the beam coordination process. ### Claim 13 (depends on 12) A system according to claim 12, wherein said second base station further comprises second means configured for creating said second interference report based on the first interference report received from its connected user's terminals. ### Claim 14 A computer program product, comprising a computer readable medium comprising code for causing at least one computer to: receive a first interference report from at least one user terminal, said first interference report including the identity and a beam indicator of the base station causing interference to said user terminal; create and update, with said received first interference report, a second interference report including at least information of said user terminal, of said base station causing interference and of said beam indicator; and coordinate, time and/or frequency resources with said base station causing interference by considering the beam identified in said second interference report.