Communication system
A communication system is disclosed in which a base station serves a communication area, wherein the communication area is formed by a plurality of directional beams each covering a respective portion of the communication area and each having a different respective beam identifier. The base station communicates control information, for a communication device (UE), using at least one directional beam associated with that communication device (e.g. a UE-specific operational beam set).
1. A base station comprising:
a transceiver; and
a controller configured to:
perform an initial access procedure with a mobile terminal,
transmit a synchronization signal and a beam specific reference signal via a beam during the initial access procedure, the beam specific reference signal being based on a cell identity of the base station which is derived from the synchronization signal via the beam and an identity corresponding to the beam; and
transmit system information specific to the beam in a resource determined by information transmitted via the beam.
2. The base station according to claim 1 wherein the controller is configured to transmit control information using a time or frequency resource determined by the system information or the beam.
3. A method performed by a base station, the method comprising:
performing an initial access procedure with a mobile terminal;
transmitting a synchronization signal and a beam specific reference signal via a beam during the initial access procedure, the beam specific reference signal being based on a cell identity of the base station which is derived from the synchronization signal via the beam and an identity corresponding to the beam; and
transmitting system information specific to the beam in a resource determined by information transmitted via the beam.
4. A mobile terminal comprising:
a transceiver; and
a controller configured to:
perform an initial access procedure with a base station;
receive a synchronization signal and a beam specific reference signal via a beam during the initial access procedure, the beam-specific reference signal being based on a cell identity of the base station which is derived from the synchronization signal via the beam and an identity corresponding to the beam; and
detect system information specific to the beam in a resource determined by information transmitted via the beam.
5. A method performed by a mobile terminal, the method comprising:
performing an initial access procedure with a base station;
receiving a synchronization signal and beam-specific reference signal via a beam during the initial access procedure, the beam-specific reference signal being based on a cell of the base station which is derived from the synchronization signal via the beam and an identity corresponding to the beam; and
detecting system information specific to the beam in a resource determined by information transmitted via the beam.
6. The method according to claim 3 , further comprising:
transmitting control information using a time or frequency resource determined by the system information or the beam.
7. The mobile terminal according to claim 4 , wherein the controller is configured to determine a time or frequency resource for receiving control information, based on the system information or the beam.
8. The method according to claim 5 , further comprising:
determining a time or frequency resource for receiving control information, based on the system information or the beam.