JPS58116820A - Frame synchronization system for time-division multiple access communication - Google Patents

Abstract

PURPOSE:To reduce the cost of the facilities of earth stations having various speeds of transmission to one repeater provided to a satellite by sending plural frame reference bursts while one of earth stations as a reference station for synchronization. CONSTITUTION:One of eart stations is regarded as the reference station for synchronization. This reference station has a modulator for frame reference bursts FRB corresponding to respective transmission speeds. Namely, FRB-H, FRB-M, and FRB-L are bursts FRB corresponding to a high- speed, an intermediate-speed, and a low-speed network group. Therefore, each earth station synchronizes with the FRBs with respective transmission speeds to establish the whole frame synchronism. Thus, each earth station employs facilities of only scale enough for transmission capacity, so the cost is reduced.

Description

[Detailed Description of the Invention] Il1 Departure Town 0 Technical Field The present invention has become a transmission? This invention relates to a frame synchronization method when data bursts of different transmission speeds are mixed in the same frame circle in time-division multiple access communication in which T bursts corresponding to network groups of 300-degrees are mixed in the same frame.

(2. Background of the technology) Time division multiplex # that enables communication between multiple earth stations using a repeater mounted on a satellite. The 7-frame standard burst tone (abbreviated as 1'lB) and the data nost (abbreviated as DT) were the same for all earth stations. Therefore, the transmission capacity was small and the transmission speed was low.
Even at large-scale earth stations, due to the iIP configuration of the entire system, there was a membership fee to use equipment with the same transmission speed as large-scale stations and perform zero communication. On the other hand, the same inventor as the inventor of the present invention proposed that the Earth station is a group of networks with different transmission speeds. We devised a communication system called V-barrel.

+31 '#, Q# Purpose The purpose of the book @ Ming is to improve the frame synchronization method in the communication method of the previous draft.

I41 Configuration of the Invention The 1m1 loss of the present invention is frame synchronization of time-division multiple access communication, in which a group of networks with different transmission speeds share one repeater, with earth stations having different transmission speeds. In the method, each transmission station has a transformer Y that can transmit FRBv and sends a frame-based burst, and other earth JI 6 transmits frame-based bursts of the network group in which its own station participates. -Reference burst 'lk' - To establish synchronization between the receivers.

■Implementation example Below, examples of the present invention are shown below.

FIG. 1 is a 7-frame format I%-T diagram of the signal received by the satellite repeater when the present invention is implemented. There are 3 # types of frame 4 quasi-bursts! It shows. That is, in Fig. 1, 1PB-H, 'IFB-M, and RB-SH respectively indicate 7-ray 5-standard bursts corresponding to high-speed, medium-speed, and low-speed O) network groups, and 1 high speed' indicates T part. The data from the high-speed transmission speed network group and the "medium speed"/Nlk*J draw are also shown in one page, showing data for each speed. Therefore, when receiving data V, each station needs to receive 1 RBK of each transmission rate to establish overall frame synchronization.

Figure 2 is the standard for IPI'lB V sending T in Figure 1.
IK award! I! FIG. 1 is a block diagram showing the I-equipment.

The 110D-111, MOD-M, and MOD-I+ are each a time division multiple access controller for obtaining the aforementioned burst signal. D-mu C-ding is the enable signal lyB! Apply T to each f-axis device. Therefore, when the equal signal ICNB follows a time plan such that the signal ICNB can be used for approximately #[A R in FIG. 1], the predetermined r[ is! Legless circumference tI in the latter part of Figure 88
The signals are sequentially sent to the L stage.

HYB is the hybrid circuit l representation T0. FIG. 3 shows the output Y representation T of each award axis device in FIG.

Figure 4 is a modified version of Figure 1 with 7 rams and 7 ohmatsu)
It is shown as T-. In FIG. 4, each νRB is shown in 111 parts of the corresponding transmission rate data. That is, the second - T enable signal control ff1) IB marking W timing Vt
Then, Kg4 is adjusted so that fνRBv occurs immediately before the data of each network group.

In this example, since high-speed, medium-speed, and low-speed data including FI'lBv are completely separated in 17 frames, each earth station belonging to the network group is It is easy to get one term by looking at the information, and therefore the equipment for communication is also simple.

Effects of the 6I bag light In this way, according to the 14ff of this invention, the synchronization of the data inserted into the Vl frame circle with different transmission speeds can be easily and accurately achieved, so it is possible to easily synchronize the transmission data as equipment of the earth station. If the scale is suitable for O) and T, it can be done at low cost.

[Brief explanation of the drawing]

Th1- shows the frame format of the signal in the embodiment of the present invention. Figure 4N shows the other 7 frame formats in addition to the +1F41 figure. Reference burst FBIB-1,...Blow furnace network solution frame reference burst!0D-H, MOD-M, MOD-Xr・-IP R
Bwf axis device TeD-(!t?-... Time division multiple access control boiler special 1 person) Shitsu Co., Ltd. Patent Attorney Eisuke Tsuchi Suzuki

Claims (1)

[Claims] Mutual IC @ 7j Tsuta transmission network group **
In a frame synchronization system #C for time-division multiple access communication in which earth stations share one repeater connected to a satellite, the earth station is used as a reference station for synchronization, and the earth station is used as a reference station for synchronization. Frame reference bursts corresponding to each transmission speed can be transmitted! - The device V has multiple frames j# single berth 1%' launched, and the other earth #1 receives the frame reference berth of the network group in which the local station is participating) and Tokisuke agrees! There are 7 types of time division multiple access communication, which is also known as tatami replacement and time division multiple access communication.