Mobile communication system and a method thereof
AssigneeNEC Corporation
InventorMasahiko Yahagi
Life of this patent
Estimating the term…
Abstract
A mobile communication system and its method, which uses a discrimination code specific to a mobile terminal as an discriminating signal for both of reverse channel and forward channel between a mobile terminal and a mobile communication network, are provided. A mobile terminal includes a predetermined modulating and demodulating code generator, and makes a call connection request through an access channel based on broadcast information from a base station. The call connection request contains an equipment number of the mobile terminal, and based on this equipment number, the network side device discriminates a code corresponding to this mobile terminal. The base station modulates and demodulates a reverse channel and forward channel signals based on the discriminated code.
Claims14
A mobile communication system comprising:
- a mobile communication network;
- and
- a mobile terminal device which performs communications with said mobile communication network, said mobile communication network including a plurality of base stations and a base station control equipment by a code division multiple access (CDMA) system,
- wherein said mobile terminal comprises:
- a call connection requesting part for transmitting, through a predetermined control channel, a call connection request signal by adding specific information provided for said mobile terminal;
- a transmitting part for diffusing and modulating a transmitting signal of a reverse channel transmitted from said mobile terminal to each of said base stations based on a transmission diffusing code specified by said specific information provided for said mobile terminal;
- and
- a receiving part for oppositely-diffusing and demodulating a received signal of a forward channel transmitted from each of said base stations to said mobile terminal based on a receiving oppositely-diffusing code specified by said specific information provided for said mobile terminal;
- and
- wherein said mobile communication network further comprises:
- a translating part for translating said specific information provided for said mobile terminal, which is contained in said call connection request signal received through said control channel, and extracting a diffusing code used for each of said reverse channel and forward channel for said mobile terminal;
- a transmitting part for diffusing and modulating a transmitted signal based on said forward channel transmission diffusing code extracted by said translating part;
- and
- a receiving part for oppositely-diffusing and demodulating a received signal based on said reverse channel receiving oppositely-diffusing code extracted by said translating part.
A mobile communication method in which a mobile terminal performs communications with a mobile communication network including a plurality of base stations and a base station control equipment by a code division multiple access (CDMA) system, the method comprising:
- in said mobile terminal,
- transmitting a call connection request signal through a predetermined control channel by adding specific information provided for said mobile terminal;
- diffusing and modulating a transmitted signal of a reverse channel going from said mobile terminal to each of said base stations based on a transmission diffusing code specified by said specific information provided for said mobile terminal;
- oppositely-diffusing and demodulating a received signal of a forward channel going from each of said base stations to said mobile terminal based on a receiving oppositely-diffusing code specified by said specific information provided for said mobile terminal;
- measuring, during communications, a receiving level of a radio signal emitted from each of said base stations adjacent to one another based on information regarding each of said adjacent base stations, which is notified beforehand;
- and
- reporting a result of said measuring to each of said base stations;
- and
- in said mobile communication network,
- translating said specific information provided for said mobile terminal, which is contained in said call connection request signal received through said control channel;
- extracting a diffusing code used for each of said reverse channel and forward channel for said mobile terminal;
- diffusing and modulating a transmitted signal based on said extracted forward channel transmission diffusing code;
- oppositely diffusing and demodulating a received signal based on said extracted reverse channel receiving oppositely-diffusing code;
- notifying a base station of said oppositely diffusing code for said reverse channel and said diffusing code for said forward channel for said mobile terminal, said base station being one where a receiving level of a radio signal emitted from each of said adjacent base stations, which is reported from said mobile terminal, reaches a predetermined value;
- and
- instructing starting of communications with said mobile terminal.
A mobile terminal for a mobile communication system including a plurality of base stations and a base station control equipment, the mobile terminal comprising:
- a call connection requesting part for transmitting a call connection request signal by adding specific information provided for said mobile terminal;
- a transmitting part for diffusing and modulating a transmitting signal of a reverse channel transmitted from said mobile terminal to each of said plurality of base stations based on a transmission diffusing code specified by said specific information provided for said mobile terminal;
- and
- a receiving part for oppositely-diffusing and demodulating a received signal of a forward channel transmitted from each of said plurality of base stations to said mobile terminal based on a receiving oppositely-diffusing code specified by said specific information provided for said mobile terminal.
A mobile communication network which communicates with a mobile terminal device, said mobile communication network comprising:
- a translating part for translating a specific information provided for said mobile terminal device, where the specific information for is contained in a call connection request signal received through a control channel, and for extracting a diffusing code used for each of a reverse channel and a forward channel for said mobile terminal device;
- a transmitting part for diffusing and modulating a transmitted signal based on said forward channel diffusing code extracted by said translating part;
- and
- a receiving part for oppositely-diffusing and demodulating a received signal based on said reverse channel receiving an oppositely-diffusing code extracted by said translating part.
A code division multiple access (CDMA) communication system comprising:
- a mobile terminal which uses a diffusing code specific to said mobile terminal for both a reverse channel and a forward channel,
- wherein said diffusing code is determined based upon specific information provided for said mobile terminal.
A code division multiple access (CDMA) communication method for a communication system including a mobile terminal, said method comprising:
- using a diffusing code specific to said mobile terminal for both a reverse channel and a forward channel.
Dependencies are inferred from the claim text.