Method and system for terminal communication
AssigneeHitachi, Ltd.
InventorsYousuke Takahashi, Kazuhito Ishida
Life of this patent
Estimating the term…
Abstract
In the CDMA environment, a local call is directly made between two mobile stations (MS) without the involvement of a base station. The local direct calls do not interfere with any existing communication lines, and the implementation on the CDMA based units includes Master MS units and Slave MS units which selects one of currently unused offset values in a pilot signal for a local direct call in the CDMA environment.
Claims29
A method of providing an optional direct communication between terminal communication units according to code division multiple access which is also used for communication between the terminal communication units via a base station in a communication network, comprising the acts of:
- a) searching currently used identification information for said code division multiple access identifying the base station surrounding a first terminal communication unit, said identification information being assigned from a set of predetermined unique identifiers, the base station having a base service area;
- b) selecting an unused one of said predetermined unique identifiers as a temporary unique identifier for direct communication between the first terminal communication unit and a second terminal communication unit;
- and
- c) establishing said direct communication between said first terminal communication unit and said second terminal communication unit according to said code division multiple access using said temporary unique identifier regardless of a relative position of said first terminal communication unit and said second terminal communication unit with respect to the base service area.
A system for providing an optional direct communication between terminal communication units according to code division multiple access which is also used for communication between the terminal communication units via a base station in a communication network, comprising:
- a first terminal communication unit which searches currently used identification information for said code division multiple access identifying the base station surrounding said first terminal communication unit, said identification information being assigned from a set of predetermined unique identifiers, said first terminal communication unit selecting an unused one of said predetermined unique identifiers as a temporary unique identifier, the base station having a base service area;
- and
- a second terminal communication unit which is capable of communicating with said first terminal communication unit via the base station, said first terminal communication unit and said second terminal communication unit establishing said direct communication between said first terminal communication unit and said second terminal communication unit according to said code division multiple access using said temporary unique identifier regardless of a relative position of said first terminal communication unit and said second terminal communication unit with respect to the base service area.
A wireless terminal communication device which communicates with a second terminal communication device via a base station as well as which directly communicates with the second terminal communication device without the base station, comprising:
- a receiver which receives a transmission signal from the base station and the second terminal communication device;
- a searching circuit being connected to said receiver and searching for used identification information identifying the base station based upon CDMA surrounding said wireless terminal communication device, said used identification information being assigned from a set of predetermined identifiers, the base station having a base service area;
- a selector circuit being connected to said searching circuit and selecting an unused one of said predetermined identifiers;
- a transmitter being connected to said selector and transmitting said unused identification information;
- and
- a line establishing circuit connected to said receiver and said transmitter for establishing a communication line with the second terminal communication device according to said CDMA after said unused identification information is transmitted regardless of a relative position of said wireless terminal communication device and the second terminal communication device with respect to the base service area.
Dependencies are inferred from the claim text.