Cellular digital mobile radio system and method of transmitting information in a digital cellular mobile radio system

A method in a cellular mobile radio system for digitally transmitting message information between a plurality of mobile radio stations and a plurality of base stations associated with respective cells or said cellular mobile radio system, said message information being in the form of digitally modulated radio signals that are transmitted and received by transmitters and receivers respectively associated with each of said plurality of base and mobile stations, said method comprising the steps of:

• transmitting digitally modulated radio signals with identical message information from at least two base stations associated with the same cell, and located at a predetermined distance from one another, to mobile stations within said cell, the digitally modulated radio signals that are transmitted from one of said base stations having certain segments which are transmitted virtually simultaneously and within the same frequency range as digitally modulated radio signals transmitted from the other of said two base stations;
• digitally modulating said radio signals at transmission of said message information within modulation time intervals, said modulation time intervals being shorter than the time necessary for radio signals to propagate a distance which corresponds to the greatest transmitting distance between two base stations associated with a cell of said cellular mobile radio system;
• and
• reconstructing the digital modulation from corresponding radio signals that are received at a mobile station during a reception time interval, said reception time interval being at least as long as the time required for radio signals to propagate a distance which corresponds to the greatest transmitting distance between said two base stations associated with said cell.

A cellular mobile radio system for communicating message information within a geographic area that is divided into communication cells, comprising:

• a plurality of base stations associated with said cells, some of said cells having at least two base stations associated therewith and located a distance from one another to transmit respective radio signals into a cell, which signals are digitally .›.encoded.!. modulated with the same message information and are transmitted at the same frequency and substantially simultaneously with one another,
• each base station including means for digitally .›.encoding.!. modulating the radio signals with message information, said .›.encoding.!. modulating being carried out with modulation time intervals which are .›.no longer than.!. within a time interval related to the time required for .›.audio.!. radio signals to propagate a distance corresponding to the greatest transmitting distance between said at least two base stations associated with said at least one cell in said system;
• and
• a plurality of mobile stations each having means for reconstructing the digital .›.encoding.!. modulation of plural corresponding radio signals respectively received over the same frequency range during a reception time interval from .›.the.!. said at least two base stations associated with .›.a.!. said at least cell, which reception time interval is at least as long as the time required for radio signals to propagate a distance corresponding to the greatest transmitting distance between said at least two base stations associated with .›.a.!. said at least one cell.

A cellular mobile radio system for communicating message information within a geographic area that is divided into communication cells, comprising:

• a plurality of base stations for transmitting radio signals into a cell, which signals are digitally modulated with substantially the same message information and are transmitted at the same frequency and substantially simultaneously with one another,
• each base station including means for digitally modulating the radio signals with message information, said modulating being carried out with modulation time intervals which are at most a few times greater than a time required for radio signals to propagate a distance corresponding to a diameter of said cell;
• and
• a plurality of mobile stations each having means for reconstructing the digital modulation of plural corresponding radio signals respectively received over the same frequency during a reception time interval from the plurality of base stations, said reception time interval is at least as long as the time required for radio signals to propagate a distance corresponding to said diameter of said cell.

A cellular mobile radio system for communicating message information and having a plurality of cells, comprising:

• a first base station for transmitting a first signal having message information into a cell,
• a second base station for transmitting a second signal having said message information into said cell,
• a mobile station in said cell having means for receiving said first and second signals, wherein said first and second signals are received with a propagation delay therebetween,
• wherein both of said first and second base stations include means for modulating said first and second signals, respectively, with said message information using a modulation time interval which is no longer than a few multiples of said propagation delay, and
• wherein said mobile station includes means for reconstructing said first and second signals during a reception time interval which is at least as
• long as said propagation delay.

A cellular mobile radio system for communicating message information across an area of coverage, comprising:

• a plurality of cells, each of said plurality of cells representing a geographic division of said area of coverage;
• a first base station for transmitting a first signal including message information into at least one of said plurality of cells, said first base station including means for modulating a radio carrier with said message information, said message information being represented by a sequence of symbols;
• a second base station for transmitting a second signal, including substantially the same message information as transmitted by said first base station, into said at least one of said plurality of cells, said second base station including means for modulating said radio carrier frequency with said substantially the same message information;
• and
• at least one mobile station located within said at least one of said plurality of said cells wherein said first and said second signals are received by said mobile station with a time shift therebetween wherein said time shift arises from a difference in a first radio propagation delay between said at least one mobile station and said first base station and a second propagation delay between said at least one mobile station and said second base station, said at least one mobile station further including means for recovering said message information from said first and said second signals during a reception time interval which reception
• time interval is greater than said time shift.

A cellular mobile radio system for communicating message information within a geographic area that is divided into communication cells, comprising:

• a plurality of base stations associated with said cells, at least one of said cells having at least two base stations associated therewith and located a distance from one another to transmit respective radio signals into said at least one cell, which signals are digitally modulated with substantially the same message information and are transmitted at the same frequency and substantially simultaneously with one another,
• each base station including a transmitter that digitally modulates the radio signals with message information, said modulation being carried out with modulation time intervals which are within a time interval related to the time required for radio signals to propagate a distance corresponding to the greatest transmitting distance between said at least two base stations associated with said at least one cell in said system;
• and
• a plurality of mobile stations each having a receiver that reconstructs the digital modulation of plural corresponding radio signals respectively received over the same frequency range during a reception time interval from said at least two base stations associated with said at least one cell, which reception time interval is at least as long as the time required for radio signals to propagate a distance corresponding to the greatest transmitting distance between said at least two base stations
• associated with said at least one cell.

A cellular mobile radio system for communicating message information within a geographic area that is divided into communication cells, comprising:

• a plurality of base stations for transmitting radio signals into a cell, which signals are digitally modulated with substantially the same message information and are transmitted at the same frequency and substantially simultaneously with one another,
• each base station including a transmitter that digitally modulates the radio signals with message information, said modulation being carried out with modulation time intervals which are at most a few times greater than a time required for radio signals to propagate a distance corresponding to a diameter of said cell;
• and
• a plurality of mobile stations each having a receiver that reconstructs the digital modulation of plural corresponding radio signals respectively received over the same frequency during a reception time interval from the plurality of base stations, said reception time interval is at least as long as the time required for radio signals to propagate a distance
• corresponding to said diameter of said cell.

A cellular mobile radio system for communicating message information and having a plurality of cells, comprising:

• a first base station for transmitting a first signal having message information into a cell,
• a second base station for transmitting a second signal having said message information into said cell,
• a mobile station in said cell having a receiver that receives said first and second signals, wherein said first and second signals are received with a propagation delay therebetween,
• wherein both of said first and second base stations include a transmitter that modulates said first and second signals, respectively, with said message information using a modulation time interval which is no longer than a few multiples of said propagation delay, and
• wherein said mobile station receiver reconstructs said first and second signals during a reception time interval which is at least as long as said propagation delay.

A cellular mobile radio system for communicating message information across an area of coverage, comprising:

• a plurality of cells, each of said plurality of cells representing a geographic division of said area of coverage;
• a first base station for transmitting a first signal including message information into at least one of said plurality of cells, said first base station including a transmitter that modulates a radio carrier with said message information, said message information being represented by a sequence of symbols;
• a second base station for transmitting a second signal, including substantially the same message information as transmitted by said first base station, into said at least one of said plurality of cells, said second base station including a transmitter that modulates said radio carrier frequency with said substantially the same message information;
• and
• at least one mobile station located within said at least one of said plurality of said cells wherein said first and said second signals are received by said mobile station with a time shift therebetween wherein said time shift arises from a difference in a first radio propagation delay between said at least one mobile station and said first base station and a second propagation delay between said at least one mobile station and said second base station said at least one mobile station further including a receiver that recovers said message information from said first and said second signals during a reception time interval which reception time interval is greater than said time shift.

A cellular mobile radio system for communicating message information across an area of coverage, comprising:

• a plurality of cells, each of said plurality of cells representing a geographic division of said area of coverage;
• a first base station for transmitting a first signal including message information into at least one of said plurality of cells said first base station including a transmitter that modulates a radio carrier with said message information, said message information being represented by a sequence of symbols;
• a second base station for transmitting a second signal, including substantially the same message information as transmitted by said first base station, into said at least one of said plurality of cells, said second base station including a transmitter that modulates said radio carrier frequency with said substantially the same message information;
• and
• at least one mobile station located within said at least one of said plurality of said cells, wherein said first and said second signals are received by said mobile station with a time of arrival difference therebetween;
• said at least one mobile station further including a receiver that combines said message information from said first and said second signals received during a reception time interval which reception time interval is greater
• than said time of arrival difference.

A cellular mobile radio system for communicating message information and having a plurality of cells, comprising:

• a first base station for transmitting a first signal having message information into a cell,
• a second base station for transmitting a second signal having said message information into said cell,
• a mobile station in said cell having means for receiving said first and second signals, wherein said first and second signals are received with a propagation delay therebetween,
• wherein both of said first and second base stations include means for modulating said first and second signals, respectively, with said message information using a modulation time interval which is no longer than a few multiples of said propagation delay, and
• wherein said mobile station includes means for combining information from said first and second signals received during a reception time interval which is at least as long as said propagation delay.

A cellular mobile radio system for communicating message information across an area of coverage, comprising:

• a plurality of cells, each of said plurality of cells representing a geographic division of said area of coverage;
• a first base station for transmitting a first signal including message information into at least one of said plurality of cells, said first base station including a transmitter that modulates a radio carrier with said message information, said message information being represented by a sequence of symbols;
• a second base station for transmitting a second signal, including substantially the same message information as transmitted by said first base station, into said at least one of said plurality of cells, said second base station including a transmitter that modulates said radio carrier frequency with said substantially the same message information;
• and
• at least one mobile station located within said at least one of said plurality of said cells
• wherein said first and said second signals are received by said mobile station with a time shift therebetween wherein said time shift arises from a difference in a first radio propagation delay between said at least one mobile station and said first base station and a second propagation delay between said at least one mobile station and said second base station
• said at least one mobile station further including a receiver that combines said message information from said first and said second signals received during a reception time interval which reception time interval is greater than said time shift.