Method and a system for beam coordination between base stations in wireless cellular systems and computer program thereof
AssigneeTelefonica, S.A.
InventorJavier LORCA HERNANDO
Life of this patent
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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.
Claims14
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.
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.
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.
Dependencies are inferred from the claim text.