JPH09294099A - Transmission system for multi-access information - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set assignment of the transmission channels of an up-circuit when a station is opened and to shorten the phase control time of the transmission timing by controlling the transmission phase that puts the transmission information on the time slots in every slave station group and based on the phase control information. SOLUTION: A master station assigns the time slots that can be used by the slave stations as the transmission channels in every group. As shot in Fig. (a), every slave station of a 1st group transmits the phase control test information on the prescribed transmission timing via a time slot. The master station receives the test information from the slave station and measures the phase relation with the original time slot that is controlled by the master station to detect the transmission delay value of every slave station. Then the master station transmits the phase information on the transmission timing to every slave station to control the transmission delay value so as to secure the test information on every slave station that has the original phase relation. Every slave station performs the phase control as shown in Fig. (b). The master station finishes the phase control as shot in Fig. (c) after it confirms that the phase error is set at the prescribed value or less by the phase control.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a master station and a plurality of slave stations, and information transmission from the slave station to the master station is referred to as a time division multiple access system (hereinafter also referred to as multi-access information transmission system or TDMA system). In the information transmission system using), it relates to the phase adjustment of the transmission timing performed by each slave station.

[0002]

2. Description of the Related Art FIG. 9 is a block diagram of a multi-access information transmission system which is a premise of the present invention. In the figure, 1
Is a master station that controls the information transmission system and simultaneously transmits information to a plurality of slave stations, which will be described later, and 2 is a remote station that is separated from the master station and is installed at different bases to transmit information to and from the master station. 3 is a transmission medium that serves as an information transmission path between the master station and each slave station, and a time slot obtained by temporally dividing one transmission medium is assigned to each slave station so that the slave station It realizes the uplink of the station. Each slave station puts information in the time slot assigned to the slave station depending on the time reference contained in the downlink transmission frame from the master station to each slave station. As a result, the information from each slave station is transmitted to the master station. Although the transmission from the master station to the slave stations is also divided into time slots, the master station sequentially puts the information addressed to each slave station in the time slot corresponding to each slave station. Is a general information transmission format, and each slave station can easily extract the reference time from the multiplex transmission frame of the time division multiplexing system.

Although the transmission medium 3 is uniform, the branch point corresponding to each slave station at the intermediate point between the master station 1 and each slave station in FIG. 9 is simply the master station 1 and each slave station. This is to show that there is a difference in the separation distance between the two. Further, the transmission medium 3 corresponds to a physical space for performing wireless communication, a coaxial line serving as a wired communication line, an optical fiber communication line, or the like.

As described above, in general, each slave station is deployed and deployed at a site having a different distance from the master station.
The transmission delay between the master station and the slave stations differs for each slave station.
In the downlink TDM system, this delay differs in the absolute time of information reception at the slave station by the transmission delay, but no particular trouble occurs in the information receiving operation itself. However, T
In the uplink of the DMA system, if the transmission timing phase adjustment is not performed according to the downlink time reference received by each slave station and transmission is performed in the time slot (TS) designated by the master station, the above difference in separation distance causes Since there is a difference both in the above-mentioned time base and in the uplink transmission time, transmission information may collide between adjacent time slots when viewed from the uplink master station reception point.

FIG. 10 shows the state of the collision. For example, it is assumed that the time slot TS5 of the NO5 slave station 2 at the apogee and the time slot TS6 of the NO6 slave station 2 at the perigee are adjacent to each other. The transmission information of the NO5 slave station 2 placed on the TS5 is relatively greatly delayed when the NO5 slave station 2 transmits the transmission information to the transmission medium 3 and further while the transmission information reaches the master station reception point. On the contrary, the NO6 slave station 2 transmission information has a relatively small delay. Therefore, at the receiving point of the master station 1,
As shown in FIG. 10B, the trailing edge of the transmission information of the NO5 slave station 2 and the leading edge of the transmission information of the NO6 slave station 2 overlap each other. The overlap occurs not only between adjacent time slots but also depending on the scale of the information transmission system and the time slot size.

FIG. 11 is a diagram for explaining a conventional phase adjusting method for preventing this overlap. When the master station 1 allocates, for example, the time slot TS1 to the NO1 slave station 2 as an uplink transmission channel, the NO1 slave station 2 counts according to the time reference sent from the master station 1 via the downlink. , The transmission timing is set, and predetermined test information is put on TS1. However, the time reference detected by the NO1 slave station 2 has a transmission delay according to the location of the slave station. Therefore, the test information of the NO1 slave station 2 is combined with the uplink transmission delay at the reception point of the master station 1. As a result, as shown in FIG. 11A, the time slot TS1 recognized by the master station 1 deviates from the time slot TS1 and the time slot TS2 overflows. The master station 1 measures the phase relationship between the reception phase of this test information and the original TS1 to detect the amount of transmission delay occurring in the NO1 slave station 2. The master station 1 corrects and adjusts this, and transmits the phase information of the transmission timing for achieving the original phase to the NO1 slave station 2. NO1 slave station 2
Performs phase adjustment based on this information as shown in FIG. When the master station 1 measures the reception phase of the test information after this phase adjustment and confirms that the phase error is less than or equal to the predetermined phase error, NO
Assuming that the phase adjustment of the first slave station 2 is completed, the transmission of the test information of the NO1 slave station 2 is stopped as shown in FIG.
From the second slave station 2 onward, the same phase adjustment is sequentially performed on other slave stations 2. When the phase adjustment is completed for all the slave stations 2 as shown in FIG. 11E, the master station 1 instructs each slave station 2 to start communication.

In practice, the time slot recognized by the master station 1 is phased so that the farthest slave station 2 can correctly receive it when it transmits with the minimum internal delay.
Although not shown, each slave station 2 is also provided with a delay circuit for adjusting the phase corresponding to the transmission delay amount of the remote station 2 at the farthest point. According to the phase information of the transmission timing sent from the master station 1, the delay amount of this delay circuit is reduced to realize the phase adjustment.

According to this phase adjustment method of the prior art, when adding a slave station, moving a time slot of the slave station, or re-installing a faulty slave station, the phase adjustment at that time is not completed. In addition, each slave station or all slave stations that are disturbed by the above-mentioned collision are reset, and time slot reassignment and phase adjustment are performed again.

[0009]

As described above, the conventional phase adjusting method is based on the transmission delay between the master station and the slave station.
Phase adjustment of the transmission timing to prevent collision between time slots on the uplink was performed one station at a time when the station was opened. Therefore, the phase adjustment of all slave stations is completed and a large amount of time is needed before starting communication. It took time.

Further, when adding a slave station, moving a time slot of the slave station, or re-installing a faulty slave station, it is necessary to temporarily stop communication for phase adjustment at that time. It was

Further, depending on the failure mode such as the constant signal transmission state, the failure of a specific slave station may seriously affect the communication of one or more slave stations.

The present invention has been made in order to solve the above problems, and it is not necessary to set the uplink transmission channel allocation at the time of opening a station, shorten the phase adjustment time of the transmission timing, or eliminate the phase adjustment. The purpose is to

In addition, when adding a slave station, moving a slave station time slot, or re-installing a failed slave station, transmission channel setting and phase adjustment of transmission timing are limited to the time slot. , The purpose is not to cause a complete disconnection of communication.

Further, it is an object of the present invention to keep the fault in the slave station even when the slave station has a serious failure such as a signal transmission state at all times.

Still another object is to enable efficient use of a transmission frame which is a set of time slots.

[0016]

According to a first aspect of the present invention, there is provided a multi-access information transmission system, which controls an information transmission system in a centralized manner and which transmits information to and from a plurality of slave stations. It consists of a plurality of slave stations that are located apart from each other and transmit information with the master station.The uplink from each slave station to the master station is a time slot that divides one transmission medium in time. In the multi-access information transmission system configured by assigning each slave station as an information transmission channel, a transmission frame that is a collection of the above time slots is based on a time reference sent from the master station,
The above-mentioned time slot is allocated to each slave station by the master station, and the allocated time slots are grouped into a plurality of slave stations which are separated from each other by a predetermined number of time slots, and the transmission interval distance between the master station and each slave station The master station measures the amount of delay that occurs, the master station transmits the phase adjustment information corresponding to that delay amount to the target slave station, and each slave station puts the transmission information in the time slot assigned by the master station. Is adjusted in units of the plurality of grouped slave stations according to the phase adjustment information.

In the multi-access information transmission system according to the second aspect of the present invention, the information transmission system is centrally controlled, and a master station for transmitting information to and from a plurality of slave stations and a master station which are separated from the master station are provided. It consists of multiple slave stations that transmit information to and from the master station.The uplink from each slave station to the master station informs each slave station of a time slot obtained by temporally dividing one transmission medium. In a multi-access information transmission system configured by allocating as a transmission channel, one or a plurality of phase adjustment regions for adjusting the transmission phase of a slave station are provided in a transmission frame that is a set of the time slots,
Based on the time reference in which the transmission frame is sent from the master station, the master station assigns the time slot to each slave station, and the master station determines the delay amount caused by the transmission section distance between the master station and each slave station. The master station transmits the phase adjustment information corresponding to the delay amount to the corresponding slave station, and each slave station sends the transmission information in the time slot assigned by the master station according to the phase adjustment information. Then, the phase adjustment area is used for adjustment once, and after the transmission phase adjustment is completed, the phase adjustment state is maintained and the time slot is allocated again by the master station.

According to the multi-access information transmission method of claim 3, in the means of the multi-access information transmission method of claim 2, the time slot width of the phase adjustment area is
This is a value obtained by adding a predetermined margin value to the sum of the phase adjustment test information size and the maximum value of the delay amount.

According to a fourth aspect of the multi-access information transmission system, the information transmission system is centrally controlled, and a master station for transmitting information to and from a plurality of slave stations and a master station are provided separately from the master station. It is composed of a plurality of slave stations that transmit information to and from the master station, and the uplink from each slave station to the master station is connected to each slave station, and each slave station occupies a plurality of first stations. The transmission medium and a second transmission medium that is connected to the transmission medium and is commonly used by each slave station and is connected to the master station.
Between the second transmission medium and the second transmission medium, a variable router that connects the master station and each of the plurality of slave stations in a time slot cycle based on the time reference sent from the master station is provided. In a multi-access information transmission system configured by allocating a time slot obtained by dividing the first and second transmission media on a time axis to each slave station as an information transmission channel, a transmission frame that is an aggregate of the time slots is , Based on the time reference sent from the master station, the master station measures the amount of delay caused by the transmission section distance between the master station and each slave station, and the master station applies the phase adjustment information corresponding to that delay amount. The transmission phase that transmits to the slave station and puts the transmission information in the time slot assigned by the master station is connected to the master station and each slave station by the variable router according to the phase adjustment information. And adjusts the transmission phase while Eosa.

According to a fifth aspect of the multi-access information transmission system of the present invention, in the means of the third aspect of the multi-access information transmission system, a variable router is connected to the master station and a plurality of slave stations at a time slot period. The transmission phase is adjusted at the same time for each slave station while changing.

According to a sixth aspect of the multi-access information transmission method, the information transmission system is centrally controlled, and a master station that transmits information to a plurality of slave stations and a master station that is separated from the master station are provided. It is composed of a plurality of slave stations that transmit information to and from the master station, and the uplink from each slave station to the master station is connected to each slave station, and each slave station occupies a plurality of first stations. The transmission medium and a second transmission medium that is connected to the transmission medium and is commonly used by each slave station and is connected to the master station.
Between the second transmission medium and the second transmission medium, a variable router that connects the master station and each of the plurality of slave stations in a time slot cycle based on the time reference sent from the master station is provided. In a multi-access information transmission system configured by time slots obtained by dividing the first and second transmission media on a time axis, each slave station transmits transmission information in one transmission frame based on a time reference sent from a master station. By continuously sending to all the time slots of the, and changing the connection of the variable router to the master station at the time slot cycle, the reception information memory that stores the received transmission information for each slave station and the reception information memory are scanned. By providing the transmission information restoring unit for extracting and restoring the transmission information, it is not necessary to adjust the transmission phase in each slave station.

In the multi-access information transmission method according to the seventh aspect, in the means of the multi-access information transmission method according to the sixth aspect, a transmission information unit is indicated at a predetermined position of the transmission information transmitted by each slave station. When an identifier is inserted and the structure of the identifier includes a cyclic sequence number that is transmission frame information, and the transmission information restoration means extracts and restores the transmission information,
It uses the above identifier and circular ordinal number.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1. FIG. 1 is an explanatory view showing the phase adjusting method of the present invention. The structure of the TDMA information transmission system based on this assumption is shown in FIG. Here, an example in which the six slave stations are divided into two groups will be described. First, the six slave stations are divided into two groups that satisfy the conditions described below. That is,
The slave stations 2 of NO1, NO3, and NO5 are assigned to the first group,
The slave stations 2 of NO2, NO4, and NO6 are set as the second group. Next, a time slot is fixedly assigned to each slave station as an uplink transmission channel. Here, NO
1 slave station 2 is assigned to TS1, NO2 slave station 2 is assigned to TS2, and so on, as shown in the same manner. Here, between each time slot assigned to each slave station in the group, as long as each slave station transmits information using the assigned time slot, transmission information based on the transmission delay between each slave station Provide a separation that does not cause collisions. In other words, conversely, it is necessary to select the number of groups per information transmission system or the combination of slave stations in the same group so that the distance can be provided. For this purpose, it is desirable to group the slave stations having a similar transmission delay amount.

The master station allocates 1, and the time slots that each slave station 2 can use as a transmission channel are assigned in units of this group. As shown in FIG. 1A, each slave station 2 in the first group uses this time slot to transmit test information for phase adjustment at a predetermined transmission timing. Due to the difference in the deployment position of the slave station 2, the test information is delayed with respect to the time axis of the time slot recognized by the master station 1 as illustrated. The master station 1 receives this test information, measures the phase relationship between the received phase and the original time slot governed by the master station 1, and detects the transmission delay amount occurring in each slave station 2. The master station 1 transmits the phase information of the transmission timing to each slave station 2 in order to adjust the transmission delay amount so that the test information of each slave station 2 has the original phase relationship. Based on this information, each slave station 2 carries out phase adjustment as shown in FIG. When the master station 1 confirms that the phase error is equal to or less than the predetermined phase error due to this phase adjustment, the test information transmission of the first group is stopped as shown in FIG. 1C, and the phase adjustment is completed. Also for the next second group, FIG.
The transmission channel is determined by the same procedure shown in (e). Two
When the phase adjustment of the second group of slave stations of the group is completed, FIG.
As shown in (f), the master station 1 notifies all the slave stations 2 of the start of communication,
This information transmission system is in a communication operating state.

According to the present embodiment, since the adjustment of six slave stations is performed for each group, the phase adjustment time required for completion is shortened to about 1/3 of the procedure shown in the prior art. To be done. The shorter the number of slave stations forming the group, the greater the shortening effect.

Embodiment 2 FIG. FIG. 2 is an explanatory view showing another phase adjusting method of the present invention. In this embodiment, in a transmission frame composed of time slots obtained by dividing the transmission medium on the time axis, one to a plurality of phase adjustment areas are provided in addition to the time slots used for actual transmission. When phase adjustment of the transmission timing of each slave station 2 associated with time slot allocation, once the phase adjustment is performed using this phase adjustment area and the phase adjustment on the phase adjustment area is completed, the transmission timing at this time While maintaining the phase adjustment information of 1), it moves to the original transmission time slot and completes the phase adjustment of the slave station.

A more specific procedure is as follows. FIG.
4 is a phase adjustment area, and the time slot width of this phase adjustment area is different from that of a general transmission time slot, and as long as information is transmitted using this time slot for phase adjustment, the time between each slave station is increased. The time width is such that the transmission information does not collide due to the transmission delay. That is, the general transmission time slot width is the unit transmission information size plus a predetermined operation margin, while the phase adjustment time slot is the unit test information size plus a predetermined operation margin. Furthermore, the maximum transmission delay occurring in the farthest terminal station 2 is added. The unit test information size can be smaller than the unit transmission information size.

In FIG. 2, the master station 1 is the N whose phase is to be adjusted.
The phase adjustment area 4 is assigned to the O1 slave station 2. The assigned NO1 slave station 2 uses the phase adjustment area 4 as shown in FIG. 2A to transmit the test information. At this time, the illustrated delay occurs between the transmitted test information and the time slot of the phase adjustment area 4 recognized by the master station 1. Master station 1
Then, this test information is received, and the phase relationship between the received phase and the original time slot controlled by the master station 1 is measured,
The amount of transmission delay occurring in the NO1 slave station 2 is detected. The master station 1 transmits the phase adjustment information of the transmission timing to the NO1 slave station 2 in order to adjust the transmission delay amount so that the transmission information of the NO1 slave station 2 has the original phase relationship. Based on this information, the NO1 slave station 2 performs phase adjustment as shown in FIG. When the master station 1 confirms that the phase error is equal to or less than the predetermined phase error due to this phase adjustment, it allocates the time slot TS1 for the original communication to the NO1 slave station 2. As shown in FIG. 2C, the NO1 slave station 2 moves to the original transmission time slot TS1 while maintaining the transmission timing phase information, and completes the time slot setting and the transmission timing phase adjustment. The master station is shown in FIG. 2 (e), (f),
As shown in (g), the phases of the respective slave stations 2 are sequentially adjusted in the same manner as the NO2 slave stations 2 and thereafter, and the communication of all slave stations 2 is started. As a result, the phase adjustment area 4 becomes empty, and the phase adjustment can be performed by the same procedure as above when the slave station 2 is added or the failure is restored.

Further, according to this embodiment, when the information transmission system is opened, the time required for completing the phase adjustment of all the slave stations is the phase adjustment area provided as compared with the prior art. It only takes a fraction.

The slave station whose phase adjustment has been completed is shown in FIG.
In order to enable the NO1 slave station 2 to communicate in (d), it is not affected by the phase adjustment of other slave stations, so that the original communication can be started immediately.

Further, the transmission frame can be effectively used by keeping the unit test information size to the minimum necessary limit.

Further, when adding a slave station, moving a time slot of the slave station, or re-installing a faulty slave station, the entire information transmission system remains in the operating state and the phase adjustment is performed for the slave station. The phase can be adjusted using the area, and it is possible to prevent all interruptions of communication.

Embodiment 3 In this embodiment, the target information transmission system is such that at least the uplink from the slave station to the master station uses the same transmission medium as the transmission medium section spatially divided corresponding to each slave station in common to each slave station. There are two sections used for. Such a form of the information transmission system is applied when each slave station is dispersedly arranged in an area and the areas where the master station and the slave station group are arranged are separated by a long distance. In recent years, there are many cases where optical fibers are used.

FIG. 3 is a block diagram of an information transmission system showing another phase adjusting method of the present invention. 3a is a section in which the transmission medium 3 is commonly used by each slave station 2, 3b is a section in which the transmission medium 3 is spatially divided corresponding to each slave station 2, and 5 is a change in the mode of the transmission medium 3 in this uplink. Each child station 2 installed at the point
It is a variable router that sequentially and selectively switches and connects the section 3b to the section 3a in synchronization with the time slot assigned to the section 3. The synchronization timing of the variable router 5 is preliminarily set so that the switching operation of the variable router 5 in the slave station corresponding section 3b and the reception timing of the slave station of the master station 1 are synchronized on the assumption of the transmission delay between the master station 1 and the variable router 5. Has been adjusted. In the optical transmission system, the variable router 5 rotates the reflection or refraction element and changes the optical axis to optically switch and connect the common section to the master station and the section corresponding to each slave station. Have been proposed. Further, when the transmission means is an electric signal, it can be easily realized by an electronic circuit by using a time division exchange technique or a space division exchange technique.

Next, the phase adjustment operation will be described with reference to FIG. When the system is started up, the master station 1 uses the downlink to allocate time slots to each slave station 2 to each slave station 2
To all of you. Each slave station 2 is shown in FIG.
As shown in (a), the test information is transmitted all at once to the designated time slot. At this time, as shown in FIG.
The transmission timing of is shifted by the transmission delay time corresponding to each slave station 2 from the time axis of the time slot which the master station 1 recognizes or the variable router 5 uses as an operation reference. Master station 1
As shown in FIG. 4 (b), the section 3b of the NO1 slave station 2 for controlling the phase of the variable router 5 by switching control is changed to the section 3a to the master station.
Connect to. The master station 1 receives the test information transmitted by the NO1 slave station 2, measures the transmission delay amount of the NO1 slave station 2, and outputs the phase information of the transmission timing determined by the transmission delay amount as N
Transmit to O1 slave station 2. As shown in FIG. 4C, the first slave station 2 adjusts the phase of the transmission timing according to the phase information of the transmission timing and transmits the test information to the designated time slot. At the parent station, as shown in FIG.
When it is confirmed that the phase adjustment has been completed by measuring the transmission delay amount of, the variable router 5 is controlled to switch to the NO2 slave station 2 corresponding section 3b for the next phase adjustment as shown in FIG. Follow the same procedure to adjust the phase. The NO2 slave station 2 is already in the state of transmitting the test information due to the simultaneous notification of the time slots, and the phase adjustment can be rapidly advanced. This is the variable router 5 and the slave station corresponding section 3
Since b is separated from each other, even if the phase relationship of the information transmission timing of each slave station 2 is in a collision state, the presence or absence of the transmission of the test information of other slave stations does not adversely affect.

According to this embodiment, as described above, each slave station can be put in the test information transmitting state all at once, so that the phase adjustment at the time of start-up can be easily performed and the required time can be shortened. In addition, the second embodiment. As described above, since it is possible to adjust the phase of an arbitrary slave station without providing a phase adjustment area on the transmission frame, the transmission frame can be efficiently used. Furthermore, there is an effect that the failure of a specific slave station does not affect the communication of other slave stations.

Fourth Embodiment Another phase adjustment method using a variable router will be described with reference to FIG. In this phase adjustment method, the third embodiment. Unlike the above case, the variable router operates in synchronization with the time slot of the uplink transmission frame even during the phase adjustment. Variable router 5
By the function of selectively switching the slave station corresponding section 3a of
The test information transmitted from each slave station 2 at the time of phase adjustment cannot collide with each other at the master station reception point. Therefore, at the time of system start-up, after the master station 1 notifies all the slave stations 2 of the time slots to be allocated to the slave stations 2 using the downlink, as shown in FIG. According to the information, the test information can be transmitted all at once to the designated time slot. At the master station 1, FIG.
As shown by, the test information transmitted in response to the switching operation of the variable router 5 is received. For the slave station 2 whose delay amount can be measured based on the received test information, the transmission delay amount is measured, and as a result, the slave stations 2 are sequentially transmitted as phase adjustment information of the transmission timing. Figure 5
As shown in (c), the transmission timing is adjusted in phase. The slave station 2 which has completed the phase adjustment of the transmission timing can immediately start communication.

In the phase adjustment according to this embodiment, each slave station 2 performs a switching operation of the variable router 5, that is, the original transmission frame timing controlled by the master station 1 and the test information transmission timing of each slave station 2 do not match. start from. Therefore, the master station 1 may not be able to receive the test information from each slave station 2 in a state sufficient for delay amount measurement. Therefore, for example, the following phase adjustment procedure is performed. Although not shown, the transmission circuit of each slave station 2 has a delay circuit corresponding to the transmission delay amount of the farthest slave station 2, and the test information is transmitted in the maximum delay amount at the beginning of transmission. When the master station 1 cannot receive the test information, the slave station 2 is instructed to reduce the delay amount using the downlink. Each slave station 2 that has received the instruction controls the delay circuit according to this instruction. This makes the master station 1
It becomes possible to receive the test information at, and as shown in FIG.
The phase of each slave station 2 can be adjusted.

According to this embodiment, each slave station is put into the test information transmission state all at once, and the master station can obtain the test information of each slave station in synchronization with the time slot. The phase of the slave station can be adjusted in an extremely short time. In addition, the second embodiment. As described above, since it is possible to adjust the phase of an arbitrary slave station without providing a phase adjustment area on the transmission frame, the transmission frame can be efficiently used. Furthermore, there is an effect that the failure of a specific slave station does not affect the communication of other slave stations.

Embodiment 5. FIG. 6 is a block diagram of an information transmission system according to the present invention which does not require phase adjustment. In this embodiment, a variable router is inserted in the communication network configuration in the fifth embodiment. And Embodiment 6. Except that the phase adjustment prior to the start of communication is unnecessary. In FIG. 6, reference numeral 6 is a reception information memory included in the master station 1. This reception information memory 6 is a TDM
A memory for sequentially storing, for each transmission frame, transmission information transmitted from each slave station 2 via the slave station 2 via the slave station 2 via the slave station corresponding section 3b, the variable router 5 and the common section 3a. is there. Reference numeral 7 denotes a transmission information restoration circuit that restores the reception transmission information in the reception information memory 6 to the state transmitted by each slave station 2.

FIG. 7 shows a TD that does not require this phase adjustment.
It is explanatory drawing which shows MA system. As shown in FIG.
Each slave station 2 has its own slave station 2 whose transmission information is designated by the master station 1.
In addition to transmitting to all the time slots of the transmission frame, all the time slots of the transmission frame or all the time slots before and after the specified time slot which is expected to be erroneously received by the master station due to the maximum transmission delay of the information transmission system (not shown) Send to. The transmission information transmitted as described above from each slave station 2 is controlled by the master station, and by the action of the variable router 5 which performs a switching operation in synchronization with the time slot of the transmission frame, as shown in FIG. As shown in (1), one time slot is extracted and transmitted to the master station 1, and the master station 1 receives the transmission information for one time slot extracted by the variable router 5. The master station 1 sequentially stores the received transmission information in the reception information memory 6.

As described above, the transmission information received by the master station 1 is not the transmission information itself transmitted by each slave station 2, but each slave station 2 densely multiplexes the transmission information over one transmission frame. The variable router 5 extracts one time slot from the transmitted one at a phase different from the transmission phase of each slave station 2. Therefore, since the transmission timing phase of each slave station 2 and the switching connection operation timing phase of the variable router 5 are different, the transmission information received by the master station 1 is shown in FIG.
As shown in (b) and (c), generally, two time slots transmitted by each slave station 2 are asynchronously extracted and stored in the reception information memory 6. Therefore, the transmission information restoration circuit 7 needs to restore the reception information received by the master station 1 and stored in the reception information memory 6 into the transmission information which each slave station 2 has tried to transmit.

FIG. 8 is an explanatory view showing the concept of restoring the transmission information from the received information. The transmission information transmitted by each slave station 2 is added with a header that is an identifier indicating the beginning and a footer that is an identifier indicating the end. On the other hand, the start information, which is the identifier indicating the beginning, and the end code, which is the identifier indicating the end, are added to the reception information of a certain child station extracted by the variable router 5 and received by the parent station 1 as one time slot. . Each slave station 2 inserts a cyclic sequence number in the header and footer. In FIG. 8, K, L, and M represent the cyclic ordinal numbers. The transmission information restoration circuit 7 of the master station 1 searches for headers and footers having the same cyclic order number, and if the appearance order is header and footer as shown in FIG. Information, that is, information between the header L and the end code of the received information unit n, and information between the start code of the received information unit n + 1 and the footer L, in that order,
It is restored as the transmission information that the slave station tried to transmit. At that time, the identifier of the reception information unit is deleted. The reception information unit is a reception unit of information received by the master station corresponding to each slave station for each transmission frame.

As shown in FIG. 8B, when the appearance order of the header and the footer having the same cyclic order is the footer K and the header, it is considered that there is a reversal phenomenon in the reception information, and the reception information unit n is started. The information between the code and the footer K and the information between the header K and the end code of the reception information unit are replaced with each other before and after to be restored as the transmission information that the slave station tried to transmit.

Actually, although not shown, a header and a footer having the same cyclic order number may appear in this order in one received information unit. In this case, since the transmission slave station 2 and the master station 1 of this transmission information are synchronized, the reception information between the header and footer is restored as the transmission information that the slave station tried to transmit.

The header and footer do not necessarily have to be at the beginning or the end of the transmission information, and may have a predetermined recognizable pattern at a predetermined position determined in advance by the information transmission system. It is feasible with only one. Further, in the above description, the reception information is temporarily stored in the reception information memory 6, and then the transmission information restoration circuit 7 restores the transmission information of the slave station transmission by using the identifier in the reception information as a clue. When the transmission information is stored and is restored as the transmission information that the slave station 2 tried to transmit, it is not necessary to add the start code and the end code, which are the identifiers indicating the division of the reception information unit. . Further, also in the method of temporarily storing the received information, a method of managing the storage position with a pointer may be used instead of the method of adding the start code and the end code.

Further, when the slave station puts transmission information on all time slots, the master station does not necessarily have to allocate a time slot to each slave station. You only need to be aware of the correspondence with. Further, the slave station also simply maintains the information element synchronization for identifying the information element, the information unit synchronization for identifying the amount of information to be placed in one time slot, and the transmission frame synchronization as the update cycle of the transmission information to be transmitted, If the transmission information is sent autonomously and densely,
Information can be transmitted to and from the master station without paying attention to a specific time slot.

According to this embodiment, an information transmission system that does not require phase adjustment can be constructed. Therefore, the configuration can be greatly simplified, and the system can be started up very quickly. In addition, the second embodiment. As described above, since it is possible to adjust the phase of an arbitrary slave station without providing a phase adjustment area on the transmission frame, the transmission frame can be efficiently used. Furthermore, there is an effect that the failure of a specific slave station does not affect the communication of other slave stations.

[0049]

The multi-access information transmission system according to the first aspect controls the information transmission system as a whole, and
It consists of a master station that transmits information to and from multiple slave stations, and a plurality of slave stations that are deployed separately from the master station and that transmits information to and from the master station. In the multi-access information transmission system, the uplink to is configured by assigning a time slot obtained by temporally dividing one transmission medium to each slave station as an information transmission channel,
A transmission frame, which is a collection of the time slots, is assigned to each child station by the parent station based on the time reference sent from the parent station, and the assigned time slots are mutually predetermined times. By grouping multiple slave stations that are separated by the number of slots, the master station measures the amount of delay that occurs due to the transmission section distance between the master station and each slave station, and the master station receives the phase adjustment information corresponding to that delay amount. The transmission phase in which each slave station puts the transmission information in the time slot assigned by the master station is adjusted in units of the grouped slave stations according to the phase adjustment information. In this case, it is possible to shorten the time required for setting the transmission channel allocation for the uplink and adjusting the phase adjustment of the transmission timing.

In the multi-access information transmission system according to the second aspect of the present invention, the information transmission system is centrally controlled, and the master station for transmitting information between a plurality of slave stations and the master station are provided separately from the master station. It consists of multiple slave stations that transmit information to and from the master station.The uplink from each slave station to the master station informs each slave station of a time slot obtained by temporally dividing one transmission medium. In a multi-access information transmission system configured by allocating as a transmission channel, one or a plurality of phase adjustment regions for adjusting the transmission phase of a slave station are provided in a transmission frame that is a set of the time slots,
Based on the time reference in which the transmission frame is sent from the master station, the master station assigns the time slot to each slave station, and the master station determines the delay amount caused by the transmission section distance between the master station and each slave station. The master station transmits the phase adjustment information corresponding to the delay amount to the corresponding slave station, and each slave station sends the transmission information in the time slot assigned by the master station according to the phase adjustment information. Then, once adjusted using the phase adjustment area, after the transmission phase adjustment is completed, the phase adjustment state is maintained and relocated to the time slot assigned by the master station, so when adding a slave station, When moving the time slot of the slave station or re-installing the faulty slave station, the transmission channel setting and phase adjustment of the transmission timing are limited to the relevant time slot, and no total interruption of communication occurs. In addition, the slave station that has completed the transmission phase adjustment can start communication as it is.In addition, if it has multiple phase adjustment areas, it sets the uplink transmission channel allocation setting and the transmission timing phase adjustment time when the station is opened. It can be shortened.

The multi-access information transmission system according to claim 3 is the means of the multi-access information transmission system according to claim 2, wherein the time slot width of the phase adjustment region is
It is the sum of the phase adjustment test information size and the maximum value of the delay amount, plus a predetermined margin value.Therefore, when adding a slave station, when moving the time slot of the slave station, or when the slave station has a failure. When re-embedding, set the transmission channel,
The phase adjustment of the transmission timing is limited to the time slot, the communication is not totally interrupted, and the slave station that has completed the transmission phase adjustment can start the communication as it is.
Furthermore, when a plurality of phase adjustment areas are provided, it is possible to shorten the time for adjusting the transmission channel allocation setting and the transmission timing phase adjustment at the time of opening a station.

According to a fourth aspect of the multi-access information transmission system, the information transmission system is centrally controlled, and a master station for transmitting information between a plurality of slave stations and a master station are provided separately from the master station. It is composed of a plurality of slave stations that transmit information to and from the master station, and the uplink from each slave station to the master station is connected to each slave station, and each slave station occupies a plurality of first stations. The transmission medium and a second transmission medium that is connected to the transmission medium and is commonly used by each slave station and is connected to the master station.
Between the second transmission medium and the second transmission medium, a variable router that connects the master station and each of the plurality of slave stations in a time slot cycle based on the time reference sent from the master station is provided. In a multi-access information transmission system configured by allocating a time slot obtained by dividing the first and second transmission media on a time axis to each slave station as an information transmission channel, a transmission frame that is an aggregate of the time slots is , Based on the time reference sent from the master station, the master station measures the amount of delay caused by the transmission section distance between the master station and each slave station, and the master station applies the phase adjustment information corresponding to that delay amount. The transmission phase that transmits to the slave station and puts the transmission information in the time slot assigned by the master station is connected to the master station and each slave station by the variable router according to the phase adjustment information. Since the transmission phase is adjusted while adjusting the transmission phase, the phase adjustment area is not required, and the transmission frame can be used efficiently, and even when a certain slave station is in a signal transmission state at all times, the failure can be prevented. Stay in the child station.

In the multi-access information transmission system according to the fifth aspect, in the means of the multi-access information transmission system according to the third aspect, a variable router is connected to the master station and each of the plurality of slave stations in a time slot cycle. Since the transmission phase is adjusted at the same time for each slave station while switching, the transmission frame can be used efficiently without the need for a phase adjustment area. The phase adjustment time of can be shortened, and when adding a slave station, moving the time slot of the slave station, or re-installing the faulty slave station,
The transmission channel setting and the phase adjustment of the transmission timing are limited to the relevant time slot, and the communication is not totally interrupted. Furthermore, the slave station which has completed the transmission phase adjustment can start the communication as it is. Even when a certain slave station has a serious failure such as a signal transmission state at all times, the failure remains in the slave station.

According to a sixth aspect of the multi-access information transmission method, the information transmission system is centrally controlled, and a master station that transmits information to a plurality of slave stations and a master station that is separated from the master station are provided. It is composed of a plurality of slave stations that transmit information to and from the master station, and the uplink from each slave station to the master station is connected to each slave station, and each slave station occupies a plurality of first stations. The transmission medium and a second transmission medium that is connected to the transmission medium and is commonly used by each slave station and is connected to the master station.
Between the second transmission medium and the second transmission medium, a variable router that connects the master station and each of the plurality of slave stations in a time slot cycle based on the time reference sent from the master station is provided. In a multi-access information transmission system configured by time slots obtained by dividing the first and second transmission media on a time axis, each slave station transmits transmission information in one transmission frame based on a time reference sent from a master station. By continuously sending to all the time slots of the, and changing the connection of the variable router to the master station at the time slot cycle, the reception information memory that stores the received transmission information for each slave station and the reception information memory are scanned. By providing a transmission information restoration unit that extracts and restores the transmission information, the adjustment of the transmission phase at each slave station is not required, so the phase adjustment area is not required and the transmission frame is not required. It enables efficient use, shortens the allocation setting time of the uplink transmission channel at the time of opening the station, and when adding a slave station, moving the time slot of the slave station or a failure When re-installing the slave station, there is no need for phase adjustment of the transmission timing, no complete disconnection of communication occurs, and also when a certain failure occurs such that a certain slave station is constantly in signal transmission state, The obstacle remains at the slave station.

The multi-access information transmission method according to claim 7 is the means of the multi-access information transmission method according to claim 6, wherein an identifier indicating a transmission information unit is provided at a predetermined position of the transmission information transmitted by each slave station. And includes a cyclic sequence number that is transmission frame information in the structure of the identifier, and when the transmission information restoring means extracts and restores the transmission information,
Since the above-mentioned identifier and cyclic sequence number are used, adjustment of the transmission phase at each slave station is not required, so a phase adjustment area is not required, transmission frames can be used efficiently, and uplink at the time of opening a station is also possible. The transmission channel allocation setting time can be shortened, and when the slave station is added, the time slot of the slave station is moved, or the faulty slave station is re-installed, the transmission timing phase can be reduced. No adjustment is required, no interruption of communication occurs, and even when a certain failure occurs such that a certain slave station is constantly in a signal transmission state, the failure remains in the slave station.

[Brief description of drawings]

FIG. 1 is a first embodiment. It is explanatory drawing which shows the phase adjustment method of.

FIG. 2 is a second embodiment. It is explanatory drawing which shows the phase adjustment method of.

FIG. 3 is a diagram showing an implementation configuration 3. It is a block diagram which shows the information transmission system of.

FIG. 4 is a third embodiment. It is explanatory drawing which shows the phase adjustment method of.

FIG. 5 is a fourth embodiment. It is explanatory drawing which shows the phase adjustment method of.

FIG. 6 is a fifth embodiment. It is a block diagram which shows the information transmission system of.

FIG. 7 is a fifth embodiment. It is explanatory drawing which shows the phase adjustment method of.

FIG. 8 is a diagram showing a configuration of the implementation 5. It is explanatory drawing which shows the concept which restores the transmission information of.

FIG. 9: Related Art and First Embodiment And 2. It is a block diagram which shows the information transmission system used as a premise.

10 is an explanatory diagram showing a problem that the information transmission system of FIG. 9 has.

FIG. 11 is an explanatory diagram showing a conventional phase adjustment method.

[Explanation of symbols]

 1. Master station 2. Slave station 3. Transmission medium 3a. Common section of slave station of transmission medium 3b. 3. A section corresponding to the slave station of the transmission medium. Phase adjustment area 5. Variable router 6. Received information memory 7. Transmission information restoration circuit

Claims (7)

[Claims] 1. An information transmission system is integrally controlled, and a master station that transmits information to a plurality of slave stations and a master station that is installed apart from the master station and that transmits information to and from the master station. It is composed of multiple slave stations, and the uplink from each slave station to the master station is configured by allocating a time slot obtained by temporally dividing one transmission medium to each slave station as an information transmission channel. In the access information transmission system, the master station allocates the above-mentioned time slot to each slave station based on the time reference sent from the master station in the transmission frame, which is a set of the above-mentioned time slots, and the allocated time slot Group a plurality of slave stations that are separated from each other by a predetermined number of time slots, measure the delay amount caused by the transmission section distance between the master station and each slave station, and measure the delay amount. The master station transmits the phase adjustment information to the corresponding slave station, and each slave station transmits the transmission information in the time slot assigned by the master station. A multi-access information transmission method characterized by adjusting in units of slave stations. 2. An information transmission system is integrally controlled, and a master station that transmits information to a plurality of slave stations and a master station that is installed apart from the master station and that transmits information to and from the master station. It is composed of multiple slave stations, and the uplink from each slave station to the master station is configured by allocating a time slot obtained by temporally dividing one transmission medium to each slave station as an information transmission channel. In the access information transmission system, one or a plurality of phase adjustment regions for adjusting the transmission phase of the slave station are provided in the transmission frame which is a set of the time slots, and the transmission frame is based on the time reference sent from the master station. , The master station allocates the above time slots to each slave station, the master station measures the delay amount caused by the transmission section distance between the master station and each slave station, and the phase adjustment information corresponding to the delay amount is transmitted to the master station. But Transmit to the slave station, each slave station puts the transmission information in the time slot assigned by the master station, adjust the transmission phase once using the phase adjustment area according to the phase adjustment information, and then transmit the above A multi-access information transmission method, characterized in that, after the phase adjustment is completed, the phase adjustment state is maintained and reallocation is performed in the time slot assigned by the master station. 3. The time slot width of the phase adjustment area is a sum of a phase adjustment test information size and a maximum value of the delay amount, and a predetermined margin value is added to the time slot width. Multi-access information transmission method. 4. An information transmission system is integrally controlled, and a master station that performs information transmission with a plurality of slave stations and a master station that is provided apart from the master station and performs information transmission with the master station. Each slave station is composed of a plurality of slave stations, an upstream line from each slave station to the master station is connected to each slave station, and each slave station has a plurality of first transmission media and each slave station connected to the transmission medium. Is used in common, and is composed of a second transmission medium connected to the master station. Between the first transmission medium and the second transmission medium, a time reference sent from the master station is used. Based on this, a variable router that connects the master station to each slave station at a time slot cycle is provided, and the time slots obtained by dividing the first and second transmission media on the time axis are used as information transmission channels for each slave station. To the multi-access information transmission system configured by allocating In the above, the transmission frame, which is a collection of the time slots, is based on the time reference sent from the master station, and the master station measures the delay amount caused by the transmission section distance between the master station and each slave station, The master station transmits the phase adjustment information corresponding to the delay amount to the corresponding slave station, and the transmission phase in which each slave station puts the transmission information in the time slot assigned by the master station A multi-access information transmission method characterized in that the transmission phase is adjusted while the connection between the station and each slave station is changed by the variable router. 5. The variable router adjusts the transmission phase at the same time for all the slave stations while changing the connection between the master station and each of the plurality of slave stations in a time slot cycle. Multi-access information transmission method. 6. An information transmission system is integrally controlled, and a master station that performs information transmission with a plurality of slave stations and a master station that is provided apart from the master station and performs information transmission with the master station. Each slave station is composed of a plurality of slave stations, an upstream line from each slave station to the master station is connected to each slave station, and each slave station has a plurality of first transmission media and each slave station connected to the transmission medium. Is used in common, and is composed of a second transmission medium connected to the master station. Between the first transmission medium and the second transmission medium, a time reference sent from the master station is used. A multi-access information transmission system including a variable router that connects a master station and a plurality of slave stations in a time slot cycle based on the above, and is configured by time slots in which the first and second transmission media are divided on a time axis. At, each slave station is a time base sent from the master station. Based on this, the transmission information is continuously transmitted to all time slots of one transmission frame, and the variable router is connected to the master station at the time slot cycle to store the received transmission information corresponding to each slave station. And a transmission information restoration unit for scanning and extracting the transmission information by scanning the reception information memory, thereby eliminating the need for adjusting the transmission phase at each slave station. . 7. The transmission information restoring means inserts an identifier indicating a transmission information unit at a predetermined position of the transmission information transmitted by each slave station, and includes a cyclic sequence number which is transmission frame information in the structure of the identifier. The multi-access information transmission method according to claim 6, wherein the identifier and the cyclic sequence number are used when the transmission information is extracted and restored.