Satellite communication system carrying out reservation of necessary time slots by predicting of reply data in remote stations

Claim 2

A satellite channel access system as claimed in claim 1, wherein said first means carries out assignment of at least one reservation time slot on transmission of one of system/control data for the remote stations and polling data from a host terminal equipment connected to the central station.

Claim 3

A satellite channel access system as claimed in claim 1, wherein said first means predicts a timing of occurrence of the remote transmission data from the destined remote station on the basis of the central transmission data to determine an assignment position of the reservation time slots exclusively for each of the remote stations.

Claim 4

A channel access system of a time division multiple access type for carrying out a time division multiple communication between a central station (C) and a plurality of remote stations (T 1 -T N ) using a common communication channel, the common communication channel is divided into frames on each having a predetermined number of time slots of equal length, the time slots being classified into random access time slots for being randomly accessible by each remote station and reservation time slots for being accessible by reservation, characterized in that said central station comprises: a data selector section (31) for predicting presence and absence of remote transmission data from a destined remote station owing to central transmission data thereof and amount of occurrence of the remote transmission data to carry out a first reservation request for time slots for said destined remote station; a central reservation slot control section (32), connected to said data selector section, for generating a central slot assignment table including reservation time slots exclusively for each of said remote stations on the basis of the first reservation request from the data selector section and a second reservation request from each of said remote stations; and a reservation information generating section (33), connected to said central reservation slot control section, for generating reservation assignment information indicative of the reservation time slots on the basis of the central slot assignment table of said reservation slot control section to add the reservation assignment information to the central transmission data; each of said remote stations comprises: a reservation contol section (50) for setting the number of necessary reservation time slots in accordance with conditions of occurrence and storing of the remote transmission data thereof; a remote reservation slot control section (53) for generating a remote slot assignment table on the basis of the reservation assignment information; and a transmission control section (51), connected to said reservation control section and said remote reservation slot control section, for transmitting, on the basis of the number of the reservation time slots set by said reservation control section and the remote slot assignment table, the remote transmission data with reservation request information suitably added to the remote transmission data on a selected one of the reservation time slots exclusive therefor or the random access time slots.

Claim 5

A channel access system as claimed in claim 4, wherein said data selector section carries out assignment of at least one reservation time slot on transmission of one of system/control data for the remote stations and polling data from a host terminal equipment connected to the central station.

Claim 6

A channel access system as claimed in claim 4, wherein said data selector section predicts a timing of occurrence of the remote transmission data form the destined remote station on the basis of the central transmission data to determine an assignment position of the reservation time slots exclusively for each of the remote stations.

Claim 7

A central station for use in a channel access system of a time division multiple access type for carrying out a time division multiple communication between said central station (C) and a plurality of remote stations (T 1 -T N ) using a common communication channel, the common communication channel being divided into frames each having a predetermined number of time slots of equal length, the time slots being classified into random access time slots for being randomly accessible by each remote station and reservation time slots for being accessible by reservation, characterized in that said central station comprises: a data selector section (31) for predicting presence and absence of remote transmission data from a destined remote station owing to central transmission data thereof and amount of occurrence of the remote transmission data to carry out a first reservation request for time slots for said destined remote station; a reservation slot control section (32), connected to said data selector section, for generating a slot assignment table including reservation time slots exclusively for each of said remote stations on the basis of the first reservation request from said data selector section and a second reservation request from each of said remote stations; and a reservation information generating section (33), connected to said reservation slot contol section, for generating reservation assignment information indicative of the reservation time slots on the basis of the slot assignment table of said reservation slot control section to add the reservation assignment information to the central transmission data.

Claim 8

A central station as claimed in claim 7, wherein said data selector section predicts a timing of occurrence of the remote transmission data from the destined remote station on the basis of the central transmission data to carry out a timing request of the reservation time slots to said reservation slot control section.

Claim 9

A remote station for use in a channel access system of a time division multiple access for carrying out a time division multiple communication between a central station (C) and a plurality of remote stations (T 1 -T N ) using a common communication channel, the common communication channel being divided into frames each having a predetermined number of time slots of equal length, the time slots being classified into random access time slots for being randomly accessible by each remote station and reservation time slots for being accessible by reservation, characterized in that said remote station comprises: a reservation control section (50) for setting the number of necessary reservation time slots in accordance with conditions of occurrence and storing of the remote transmission data thereof; a reservation slot control section (53) for generating a slot assignment table on the basis of the reservation assignment information; and a transmission control section (51), connected to said reservation control section and said reservation slot control section, for transmitting, on the basis of the number of the reservation time slots set by said reservation control section and the slot assignment table, the remote transmission data with reservation request information suitably added to the remote transmission data on a selected one of the reservation time slots exclusive therefor or the random access time slots.

Claim 10

A remote station as claimed in claim 9, wherein said remote station comprises a transmission data buffer (49), said transmission control section judging timings and kinds of the time slots in accordance with the slot assignment table to select and transmit data in said transmission data buffer.