Method for coordinated transmission in a plurality of cells of a wireless communication system

A radio equipment comprising:

• circuitry configured to operatively connect to a receiving unit and to a transmission unit for wireless communication with a user equipment;
• and
• an interface for communicating with a second radio equipment configured to establish wireless communication with the user equipment,
• wherein the circuitry is configured to dynamically set a radio quality metric on a per-user equipment basis and to transmit the radio quality metric via the transmission unit to the user equipment for detecting an interference condition;
• the circuitry is configured to receive a trigger signal from the user equipment via the receiving unit when the user equipment detects the interference condition between signals received from the second radio equipment and determines activation of coordinated transmission of the second radio equipment by calculating difference between a quality of signal from the radio equipment and a quality of signal from the second radio equipment and comparing the difference with the radio quality metric, the trigger signal comprising an identifier of the second radio equipment, and to receive a signal that does not contain the identifier of the second radio equipment when the user equipment does not detect the interference condition from the second radio equipment;
• and
• the radio equipment further comprising:
• a data interface, operatively connected to the circuitry, for communicating with the second radio equipment, the circuitry being configured to coordinate transmission with the second radio equipment upon reception of the trigger signal, and the circuitry does not coordinate transmission with the second radio equipment when the circuitry receives the signal that does not contain the identifier of the second radio equipment;
• and
• at least one database comprising information relative to a user of the user equipment, whereby the circuitry is further configured to set the radio quality metric on a per-user basis based on information stored in the at least one database.

A user equipment for use in a wireless communication system including a plurality of radio equipments which consist of a serving radio equipment, neighboring radio equipments and interfering radio equipments among the neighboring radio equipments, the user equipment comprising:

• circuitry configured to
• receive a radio quality metric from the serving radio equipment of the communication system, the radio quality metric dynamically set by the serving radio equipment on a per-user equipment basis;
• perform a cell search independent of measurement configuration information and a candidate cell list from the serving cell;
• measure quality of signals received from a plurality of radio equipments of the communication system based on the cell search;
• calculate a plurality of differences between a quality of signal from the serving radio equipment and quality of signals from each of the neighboring radio equipments, each difference of the plurality of differences being between a quality of signal from the serving radio equipment and a quality of signal from a corresponding neighboring radio equipment;
• compare the plurality of differences with the radio quality metric;
• determine activation of coordinated transmission of the plurality of radio equipments when the user equipment detects an interference condition between signals received from any one of the plurality of cells according to a result of comparing the plurality of differences with the radio quality metric;
• operatively connect to a transmission unit, the circuitry configured to generate a trigger signal and to transmit the trigger signal to a radio equipment of the plurality of radio equipments via the transmission unit, the trigger signal configured to trigger coordinated transmission of at least two equipments of the plurality of radio equipments;
• transmit the trigger signal when the interference condition is detected by comparing the plurality of differences with the radio quality metric received from the serving radio equipment of the wireless communication system;
• and
• transmit a signal that causes transmission from only one of the plurality of radio equipments, without coordinated transmission of at least two equipments of the plurality of radio equipments, when the user equipment does not detect the interference condition from any one of the plurality of radio equipments.