Communication system, base station, mobile station, and radio communication system
First Claim
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1. A communication system for communication between at least one base station and at least one mobile station, said communication system comprising:
- a base station; and
a plurality of mobile stations for respectively transmitting and receiving data to and from said base station,wherein any of said base station and a mobile station of said plurality of mobile stations detects a satisfactory or unsatisfactory transmission quality between said base station and said mobile station and changes a multiplexing rate of transmission data based on a detected transmission quality, wherein when said transmission quality is detected to be unsatisfactory said base station communicates with fewer of said plurality of mobile stations in order to lower said multiplexing rate, whereinsynchronizing words which differ from one another are respectively set for a plurality of base stations including said base station and each of said plurality of base stations transmits signals in synchronization with one another at a maximum multiplexing rate using slots and slot frequencies equally allocated for each of said plurality of base stations, andsaid plurality of mobile stations respectively carries out a reception operation with respect to a predetermined slot and slot frequency and calculates a correlation value between a reference synchronizing word and a received signal in order to select a base station corresponding to a received signal with a highest correlation value.
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Abstract
In a radio telephone system using a digital circuit, a transmission-line state of a radio telephone digital circuit is detected by a detector. In response to the transmission-line state detected by the a detector, a multiplexing rate for transmission or reception in the radio telephone digital circuit is changed.
37 Citations
28 Claims
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1. A communication system for communication between at least one base station and at least one mobile station, said communication system comprising:
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a base station; and a plurality of mobile stations for respectively transmitting and receiving data to and from said base station, wherein any of said base station and a mobile station of said plurality of mobile stations detects a satisfactory or unsatisfactory transmission quality between said base station and said mobile station and changes a multiplexing rate of transmission data based on a detected transmission quality, wherein when said transmission quality is detected to be unsatisfactory said base station communicates with fewer of said plurality of mobile stations in order to lower said multiplexing rate, wherein synchronizing words which differ from one another are respectively set for a plurality of base stations including said base station and each of said plurality of base stations transmits signals in synchronization with one another at a maximum multiplexing rate using slots and slot frequencies equally allocated for each of said plurality of base stations, and said plurality of mobile stations respectively carries out a reception operation with respect to a predetermined slot and slot frequency and calculates a correlation value between a reference synchronizing word and a received signal in order to select a base station corresponding to a received signal with a highest correlation value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A base station for transmitting and receiving data to and from a plurality of mobile stations, said base station comprising:
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transmission means for multiplexing and transmitting data; reception means for receiving data transmitted from a mobile station of said plurality of mobile stations; and control means for changing a multiplexing rate of said transmission means based on a detected satisfactory or unsatisfactory transmission quality output from said mobile station of said plurality of mobile stations such that when said unsatisfactory transmission quality is detected said base station communicates with fewer of said plurality of mobile stations in order to lower said multiplexing rate, wherein said base station is part of a plurality of base stations, synchronizing words which differ from one another are respectively set for said plurality of base stations including said base station and each of said plurality of base stations transmits signals in synchronization with one another at a maximum multiplexing rate using slots and slot frequencies equally allocated for each of said plurality of base stations, and said plurality of mobile stations respectively carries out a reception operation with respect to a predetermined slot and slot frequency and calculates a correlation value between a reference synchronizing word and a received signal in order to select a base station corresponding to a received signal with a highest correlation value. - View Dependent Claims (9, 10, 11)
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12. A mobile station for transmitting and receiving multiplexed data to and from a base station, said mobile station comprising:
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demodulating means for receiving and demodulating data transmitted from a base station, wherein said demodulating means includes reception means, word generating means for generating a pseudo synchronizing word based on a reference synchronizing word and estimation information about a transmission state between said generating means and said base station, and extracting means for extracting data from an output of said reception means using said pseudo synchronizing word generated by said generating means; detecting means for detecting a quality of transmission with respect to said base station; transmission means for transmitting data to said base station, said data including data concerning said quality of transmission detected by said detecting means; and signal generating means for generating a signal used by said base station to change a multiplexing rate based on said quality of transmission detected by said detecting means, said signal being used for changing said multiplexing rate use by said transmission means to transmit to said base station, wherein said signal causes said base station to communicate with fewer mobile stations in order to lower said multiplexing rate when said quality of transmission is unsatisfactory. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A radio communication system for use with at least one base station and at least one mobile station, said radio communication system comprising:
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a base station for multiplexing and transmitting data; and a plurality of mobile stations for respectively transmitting and receiving data to and from said base station through a radio transmission line, wherein one of said base station and a mobile station of said plurality of mobile stations includes detecting means for detecting a satisfactory or unsatisfactory transmission quality of data transmitted through said radio transmission line based on data transmitted through said radio transmission line and changing a multiplexing rate of transmission data based on a detected transmission quality, when said transmission quality is detected to be unsatisfactory said base station communicates with fewer of said plurality of mobile stations in order to lower said multiplexing rate, and said plurality of mobile stations respectively detects a correlation value between a signal transmitted from said base station transmitting and receiving data thereto and therefrom and a synchronizing word corresponding to said based station transmitting and receiving data thereto and therefrom, detects a correlation value between a signal transmitted from another base station adjacent to said base station transmitting and receiving data thereto and therefrom and a synchronizing word corresponding to said adjacent base station, and carries out a hand-off process to hand off to said adjacent base station when said correlation value between said signal transmitted from said adjacent base station and said synchronizing word corresponding to said adjacent base station is higher than said correlation value between said synchronizing word corresponding to said base station transmitting and receiving data thereto and therefrom and said signal transmitted from said base station transmitting and receiving data thereto and therefrom. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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Specification