Cellular digital mobile radio system and method of transmitting information in a digital cellular mobile radio system
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04B-007/04
H04B-007/26
출원번호
US-0136760
(1993-10-15)
우선권정보
SE-0000698 (1988-02-29)
발명자
/ 주소
Uddenfeldt Jan E.,SEX
Raith Alex K.,SEX
출원인 / 주소
Telefonaktiebolaget LM Ericsson, SEX
대리인 / 주소
Burns, Doane, Swecker & Mathis, L.L.P.
인용정보
피인용 횟수 :
2인용 특허 :
68
초록▼
The invention relates to a cellular digital mobile radio system including base stations (B.sub.m, B.sub.n) and mobile stations (MS.sub.1, MS.sub.2) with transmitters and receivers. The invention also relates to a method of transmitting message information digitally between mobile and base stations i
The invention relates to a cellular digital mobile radio system including base stations (B.sub.m, B.sub.n) and mobile stations (MS.sub.1, MS.sub.2) with transmitters and receivers. The invention also relates to a method of transmitting message information digitally between mobile and base stations in such a system. In accordance with the invention, at least two base station transmitters (B.sub.ma, B.sub.mb, B.sub.na, B.sub.nb) at a given transmitting distance from each other are assigned to each of certain cells (C.sub.m, C.sub.n) within a restricted geographical area. The base station transmitters which are assigned to the same cell transmit digitally modulated radio signals within the same frequency range at least partially simultaneously to the mobile stations of the cell. The radio signals from different base station transmitters associated with the same cell are digitally modulated with the same message information to the mobile stations in the cell. Different base station transmitters (9A, 9B) preferably transmit the digitally modulated radio signals with the same message information to a given mobile station with a given mutual transmission time shift. Here, the transmission time shift is selected individually for each mobile station, such that corresponding digitally modulated radio signals with the same message information to a given mobile station from different base station transmitters arrive practically simultaneously at the mobile station.
대표청구항▼
[ We claim:] [10.] 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
[ We claim:] [10.] 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.]. .Iadd.modulated .Iaddend.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.]. .Iadd.modulating .Iaddend.the radio signals with message information, said .[.encoding.]. .Iadd.modulating .Iaddend.being carried out with modulation time intervals which are .[.no longer than.]. .Iadd.within a time interval related to .Iaddend.the time required for .[.audio.]. .Iadd.radio .Iaddend.signals to propagate a distance corresponding to the greatest transmitting distance between .Iadd.said at least .Iaddend.two base stations associated with .Iadd.said at least .Iaddend.one cell in said system; anda plurality of mobile stations each having means for reconstructing the digital .[.encoding.]. .Iadd.modulation .Iaddend.of plural corresponding radio signals respectively received over the same frequency range during a reception time interval from .[.the.]. .Iadd.said at least .Iaddend.two base stations associated with .[.a.]. .Iadd.said at least .Iaddend.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 .Iadd.said at least .Iaddend.two base stations associated with .[.a.]. .Iadd.said at least one .Iaddend.cell. .Iadd.11. The cellular mobile system of claim 10, wherein said time interval is a few times greater than said propagation time. .Iaddend..Iadd.12. The cellular mobile system of claim 10, wherein said at least two base stations associated with a cell are both located within said at least one cell. .Iaddend..Iadd.13. 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; anda 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. .Iaddend..Iadd.14. 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, andwherein said mobile station includes means for reconstructing said first and second signals during a reception time interval which is at least as g as said propagation delay. .Iaddend..Iadd.15. The cellular mobile radio system of claim 10, wherein the time interval is less than to a few times greater than the time required for radio signals to propagate the distance corresponding to the greatest transmitting distance between two base stations associated with said at least one cell in said system. .Iaddend..Iadd.16. The cellular mobile radio system of claim 10, wherein said time interval is no longer than the time required for radio signals to propagate the distance corresponding to the greatest transmitting distance between two base stations associated with said at least one cell in said system. .Iaddend..Iadd.17. The cellular mobile radio system of claim 10, wherein said time interval is a few times greater than the time required for radio signals to propagate the distance between two base stations associated with said at least one cell in said system. .Iaddend..Iadd.18. 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; andat 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 e interval is greater than said time shift. .Iaddend..Iadd.19. The system of claim 18, wherein said time shift is intentionally introduced in the transmission of said first signal and said second signal. .Iaddend..Iadd.20. The system of claim 19, wherein said first base station and said second base station further include means for shifting the transmission time of said first signal and said second signal, pectively. .Iaddend..Iadd.21. The cellular mobile radio system of claim 1, wherein said reconstructing means includes an adaptive equalizer. .Iaddend..Iadd.22. The cellular mobile radio system of claim 10, wherein said reconstructing means includes an adaptive equalizer. .Iaddend..Iadd.23. The cellular mobile radio system of claim 13, wherein said reconstructing means includes an adaptive equalizer. .Iaddend..Iadd.24. The cellular mobile radio system of claim 14, wherein said reconstructing means includes an adaptive equalizer. .Iaddend..Iadd.25. The cellular mobile system of claim 18, wherein said overing means includes an adaptive equalizer. .Iaddend..Iadd.26. 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; anda 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 ociated with said at least one cell. .Iaddend..Iadd.27. The cellular mobile system of claim 26, wherein said time interval is a few times greater than said propagation time. .Iaddend..Iadd.28. The cellular mobile system of claim 26, wherein said at least two base stations associated with a cell are both located within said at least one cell. .Iaddend..Iadd.29. 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; anda 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 responding to said diameter of said cell. .Iaddend..Iadd.30. 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, andwherein 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. .Iaddend..Iadd.31. The cellular mobile radio system of claim 30, wherein said time interval is less than to a few times greater than the time required for radio signals to propagate the distance corresponding to the greatest transmitting distance between two base stations associated with said at least one cell in said system. ddend..Iadd.32. The cellular mobile radio system of claim 30, wherein said time interval is no longer than the time required for radio signals to propagate the distance corresponding to the greatest transmitting distance between two base stations associated with said at least one cell in said system. .Iaddend..Iadd.33. The cellular mobile radio system of claim 30, wherein said time interval is a few times greater than the time required for radio signals to propagate the distance between two base stations associated with said at least one cell in said system. .Iaddend..Iadd.34. 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; andat 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. .Iaddend..Iadd.35. The system of claim 34, wherein said time shift is intentionally introduced in the transmission of said first signal and said second signal. .Iaddend..Iadd.36. The system of claim 34, wherein said first base station and said second base station further include a time measurement unit that shifts the transmission time of said first signal said second signal, respectively. .Iaddend..Iadd.37. 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; andat 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 n said time of arrival difference. .Iaddend..Iadd.38. 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, andwherein 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. .Iaddend..Iadd.39. 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; andat least one mobile station located within said at least one of said plurality of said cellswherein 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 stationsaid 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. .Iaddend.
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이 특허에 인용된 특허 (68)
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