Access method mobile station and base station for CDMA mobile communication system

Claim 2

A multiple-access method for a CDMA mobile communication system according to claim 1, additionally having a measurement step for measuring the traffic of said access channel by said base station, an obtaining step for obtaining the probability of transmission permission for data of each mobile station to be transmitted on the basis of the measured result in said measurement step, a reporting step for reporting said probability of said transmission permission obtained in said obtaining step to said each mobile station, and a reporting and waiting step for reporting said occurrence of data to be transmitted with a probability based on said transmission probability, and waiting for a predetermined waiting time when the reporting of said occurrence of data is not finished, in which the reporting and the waiting are carried out repeatedly by each mobile station until the reporting is finished.

Claim 3

A multiple-access method for a CDMA mobile communication system according to claim 1, additionally having a reporting step for reporting a measured result to said mobile station from said base station after measuring the traffic of said access channel, and a reporting and waiting step for reporting said occurrence of data to be transmitted with a probability based on a transmission probability after obtaining said transmission probability for data to be transmitted on the basis of the reported measured result, and waiting for a predetermined waiting time when the reporting of said occurrence of data is not finished, in which the reporting and the waiting are carried out repeatedly by each mobile station until the reporting is finished.

Claim 4

A multiple-access method for a CDMA mobile communication system according to claim 1 or 2, wherein said each mobile station changes said waiting time at random within a predetermined range.

Claim 5

A multiple-access method for a CDMA mobile communication system according to claim 1 or 2, wherein said each mobile station determines said waiting time on the basis of the number of times of retransmission of data to be transmitted.

Claim 6

A multiple-access method for a CDMA mobile communication system according to claim 1 or 2, wherein said each mobile station changes said probability of said transmission permission on the basis of the number of times of retransmission of data to be transmitted.

Claim 7

A multiple-access method for a CDMA mobile communication system according to claim 1, wherein said message channel is divided into one channel.

Claim 8

A multiple-access method for a CDMA mobile communication system according to claim 1, wherein said message channel is divided into a plurality of channels.

Claim 9

A multiple-access method for a CDMA mobile communication system according to claim 8, wherein a spreading code corresponding to said each message channel is assigned to said each mobile station in advance, said each mobile station reports an occurrence of data to be transmitted and said spreading code assigned to itself to said base station through said access channel, and said each mobile station transmits said data to be transmitted at said transmission timing which is reported from said base station, by using said message channel which is the same number corresponding with at least one of said spreading codes assigned to itself.

Claim 10

A multiple-access method for a CDMA mobile communication system according to claim 8, wherein said base station reports said transmission timing of data to be transmitted and at least one of said spreading code to said each mobile station through said broadcast channel, and said each mobile station transmits said data to be transmitted at said transmission timing which is reported from said base station, by using said message channel which is the same number corresponding with as least one of said spreading codes reported from said base station.

Claim 11

A multiple-access method for a CDMA mobile communication system according to claim 1, wherein said access channel is divided into a plurality of channels.

Claim 12

A multiple-access method for a CDMA mobile communication system according to claim 11, wherein each of said plurality of access channels is assigned to said each mobile station in advance, and said each mobile station reports an occurrence of data to be transmitted through said access channel which is assigned to itself.

Claim 13

A multiple-access method for a CDMA mobile communication system according to claim 11, wherein said each mobile station has a probability distribution for using said each access channel for said each mobile station, and selects an access channel from said plurality of access channels on the basis of said probability distribution, and transmits said data to be transmitted at said transmission timing which is reported from said base station through said selected access channel.

Claim 14

A multiple-access method for a CDMA mobile communication system according to claim 13, wherein said base station reports said probability distribution to said each mobile station through said broadcast channel.

Claim 15

A mobile station for a CDMA mobile communication system which consists of a common channel which is used in common when a plurality of mobile stations transmit data to a base station at optional timing, and a broadcast channel which is used when the base station transmits data to a plurality of the mobile stations, said mobile station consisting of: a transmission and receiving means for transmitting and receiving a signal between said base station through said broadcast channel, a processing means for using said common channel by dividing said common channel into an access channel and a message channel, and for modulating data to be transmitted, and supplying the modulated data to said transmission and receiving means, and for demodulating a received signal of said transmission and receiving means, and a control means for controlling said transmission and receiving means and said processing means so as to report an occurrence of data to be transmitted to said base station through said access channel, modulate said data to be transmitted at said transmission timing reported from said base station by using said message channel, and supply the modulated data to said transmission and receiving means.

Claim 16

A mobile station for a CDMA mobile communication system according to claim 13, wherein said controlling means reports an occurrence of said data to be transmitted to said base station with a probability based on a transmission probability of a transmission permission, in which said transmission probability is obtained by said base station on the basis of the traffic of said access channel, corresponding to data to be transmitted, and waiting for a predetermined waiting time when the reporting of said occurrence of data is not finished, and carries out the reporting and the waiting repeatedly until the reporting is finished.

Claim 17

A mobile station for a CDMA mobile communication system according to claim 15, wherein said controlling means obtains the probability of a transmission permission corresponding to data to be transmitted on the basis of the measured result of the traffic of said access channel which is reported from said base station, and reports an occurrence of said data to be transmitted to said base station with a probability based on said transmission probability of said transmission permission, waits for a predetermined waiting time when the reporting of said occurrence of data is not finished, and repeatedly carries out the reporting and the waiting until the reporting is finished.

Claim 18

A mobile station for a CDMA mobile communication system according to claim 16 or 17, wherein said controlling means changes said waiting time at random within a predetermined range.

Claim 19

A mobile station for a CDMA mobile communication system according to claim 16 or 17, wherein said controlling means determines said waiting time on the basis of the number of times of retransmission of data to be transmitted.

Claim 20

A mobile station for a CDMA mobile communication system according to claim 16 or 17, wherein said controlling means changes said probability of said transmission permission on the basis of the number of times of retransmission of data to be transmitted.

Claim 21

A mobile station for a CDMA mobile communication system according to claim 15, wherein said message channel is divided into one channel.

Claim 22

A mobile station for a CDMA mobile communication system according to claim 15, wherein said message channel is divided into a plurality of channels, and said processing means sets at least one of said plurality of message channels which is used for transmitting data to be transmitted to a message channel corresponding to a spreading code by modulating said data to be transmitted with said spreading code.

Claim 23

A mobile station for a CDMA mobile communication system according to claim 22, wherein said controlling means maintains said spreading code corresponding to at least one of said message channels, and controls said processing means and said transmission and receiving means so as to transmit said occurrence of said data to be transmitted and said maintained spreading code to said base station through said access channel, and controls said processing means and said transmission and receiving means to transmit said data to be transmitted at said transmission timing which is reported from said base station, with said at least one of message channels.

Claim 24

A mobile station for a CDMA mobile communication system according to claim 22, wherein said controlling means controls said processing means and said transmission and receiving means so as to transmit said data to be transmitted at said transmission timing which is reported from said base station, with said message channel which is the same number corresponding to at least one of said spreading codes reported from said base station.

Claim 25

A mobile station for a CDMA mobile communication system according to claim 15, wherein said access channel is divided into a plurality of channels.

Claim 26

A mobile station for a CDMA mobile communication system according to claim 25, wherein said controlling means controls said processing means and said transmission and receiving means to report said occurrence of said data to be transmitted with said access channel corresponding with itself in advance.

Claim 27

A mobile station for a CDMA mobile communication system according to claim 25, wherein said controlling means maintains a probability distribution for use of said each access channel, and selects an access channel from said plurality of access channels on the basis of said probability distribution, and controls said processing means and said transmission and receiving means to transmit said data to be transmitted at said transmission timing which is reported from said base station with said selected access channel.

Claim 28

A mobile station for a CDMA mobile communication system according to claim 27, wherein said probability distribution is reported from said base station to said each mobile station.

Claim 29

A base station for a CDMA mobile communication system which consists of a common channel which is used in common when a plurality of mobile stations transmit data to a base station at optional timing and a broadcast channel which is used when the base station transmits data to a plurality of the mobile stations, said base station consisting of: a transmission and receiving means for transmitting and receiving a signal between said base station through said common channel and said broadcast channel, a processing means for using said common channel by dividing said common channel into an access channel and a message channel, modulating data to be transmitted, supplying the modulated data to said transmission and receiving means, and demodulating a received signal of said transmission and receiving means, and a control means for controlling said transmission and receiving means and said processing means reporting to report a transmission timing, which is decided thereby on the basis of an observed result obtained by observation of a received signal by said transmitting and receiving means when an occurrence of data is transmitted from said mobile station, of data to be transmitted to said mobile station through said broadcast channel, and to receive data be transmitted at said transmission timing, and demodulate said received data.

Claim 30

A base station for a CDMA mobile communication system according to claim 29, wherein said controlling means obtains a probability of a transmission permission corresponding to said data to be transmitted of said each mobile station, and reports said probability of said transmission permission to said plurality of mobile stations through said broadcast channel.

Claim 31

A base station for a CDMA mobile communication system according to claim 29, wherein said controlling means measures the traffic of said access channel, and reports the measured result to said plurality of mobile stations through said broadcast channel.

Claim 32

A base station for a CDMA mobile communication system according to claim 29, wherein said message channel is divided into one channel.

Claim 33

A base station for a CDMA mobile communication system according to claim 29, wherein said message channel is divided into a plurality of channels, and said processing means demodulates a signal supplied from said transmission and receiving means on the basis of said spreading code.

Claim 34

A base station for a CDMA mobile communication system according to claim 33, wherein said controlling means controls said processing means and said transmission and receiving means to report said transmission timing of said data to be transmitted, which is decided on the basis of said observed result when said occurrence of said data to be transmitted and said spreading code from said mobile station through said access channel are reported, and to receive data which is transmitted at said transmission timing through said message channel corresponding to said spreading code, and to demodulate said received data.

Claim 35

A base station for a CDMA mobile communication system according to claim 33, wherein said controlling means controls said processing means and said transmission and receiving means to report said transmission timing of said data to be transmitted and said spreading code corresponding to at least one of said plurality of message channels, in which said transmission timing and said spreading code are decided thereby on the basis of said observed result when said occurrence of said data to be transmitted is reported from said mobile station, to said mobile station through said broadcast channel, and to receive data which is transmitted through said message channel corresponding to said spreading code at said transmission timing, and to demodulate said received data.

Claim 36

A base station for a CDMA mobile communication system according to claim 29, wherein said access channel is divided into a plurality of channels, said controlling means decides a probability distribution for using said each of said plurality of access channels, and controls said processing means and said transmission and receiving means to report said probability distribution to said each mobile station.

Claim 37

A base station for CDMA mobile communication system according to claim 36, wherein said controlling means decides said probability distribution on the basis of said observed result.