JPH10303846A - Variable capacity transmission method in time division transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain asymmetrical service and multiple address communication (broadcast type service) by varying incoming and outgoing areas in a transmitter that adopts the time division transmission system and the time division multiplex access system. SOLUTION: In this method, a station equipment 1 and pluralities of user equipments 21 , 22 , 23 are connected by one transmission line, a time difference is provided to outgoing information and incoming information between the station equipment 1 and pluralities of the user equipments 21 , 22 , 23 to transmission information in time division for each burst and transmission reception is conducted so that the incoming information from each user equipment is arranged in the station equipment 1 without duplication. In this case, in an outgoing area, the width of the outgoing area and the outgoing data amount to each user equipment are changed and the outgoing/incoming data capacity is informed to each user equipment and each user equipment receives a designated outgoing data capacity and each user equipment sends the data with a capacity designated in the incoming area to revise optionally the outgoing area and the incoming area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a time division transmission (Time Division Transmission).
Compression Multiplex (TCM) method and Time Division Multiple Access (TD)
The present invention relates to an improvement in a transmission method in a transmission system using the MA) system.

In a transmission apparatus using a time division transmission system and a time division multiple access system, an up area and a down area are made variable or an asymmetric service or broadcast (broadcast type service) is performed. It is desirable to flexibly cope with various services and efficiently use limited capacity on a transmission path.

[0003]

2. Description of the Related Art The time division transmission system realizes duplex communication by transmitting uplink information and downlink information using the same wavelength and providing a time difference on a single transmission line. This is also called a ping-pong transmission method. In the time division multiple access method, a burst of uplink information transmitted from a plurality of devices (user devices) is
This is a method in which the signals are received by the station apparatus after being arranged on the time axis.

FIG. 8 shows a configuration example of a conventional transmission system to which the present invention is applied.
An example of a double star (PDS) system is shown, where 1 is a station device, 2 _{1, 2,} 2 and ₃ are user devices # 1, # 2, #, respectively.
Reference numerals 3 and 3 denote optical transmission paths, and reference numeral 4 denotes a branch element.

FIG. 9 shows a burst configuration on a transmission line in a conventional transmission system, and exemplifies the case of the system shown in FIG. The station device 1 sends down information to the optical transmission line 3 in the down region of the transmission / reception switching signal having a constant burst cycle. Downlink information is branched at the branch element 4 is transmitted to the user device 2 _1, 2 _2, 2 _3, respectively. On the other hand, the uplink information # 1 sends the user device 2 _1, 2 _2, 2 _3, # 2, # 3, in the uplink region of the transmission and reception switching signal, reaches the station unit 1 and aligned in a certain order.

In a conventional transmission system, as shown in FIG. 9, a region for transmitting uplink information (uplink region) and a region for transmitting downlink information (downlink region) on a transmission path.
At this time, the burst period composed of the uplink region and the downlink region is fixed, and the data capacity that can be transmitted in the uplink region and the downlink region is the same.

Further, the services provided to each user device are all symmetrical services, and there are no asymmetrical services having different downlink and uplink data capacities, and no broadcast type service in which a plurality of users share downlink information.

[0008] On the other hand, with the spread of multimedia in recent years, a variety of signals such as video and audio have been transmitted, and in PDS systems and the like, asymmetric services with different amounts of uplink and downlink information have been transmitted. Or multiple user devices (may have multiple channel boards)
In addition, it has been required to efficiently transmit the same information in a limited area.

However, there is no example of such a transmission system and service in the conventional technology. For example, if the downlink information is a video signal with a large amount of information and the uplink information is a video channel selection signal with a small amount of information, the uplink information is almost empty in the symmetric service, and this empty area has For example, a method is employed in which a continuous signal such as "0" or "1" is inserted and transmitted as a symmetric service, and the limited transmission capacity between the station device and the user device is wasted.

Accordingly, by making the downstream area and the upstream area in one burst period (one frame) arbitrarily variable, various services such as asymmetric services and broadcast (broadcast-type services) as well as symmetric services can be achieved. There is a need to be able to accommodate services more efficiently.

[0011]

[Problems to be solved by the invention]

(1) In the conventional technology, there is no method in which the downstream region and the upstream region in one burst period (one frame) can be arbitrarily changed, and therefore, such as video and audio in recent multimedia technology. A variety of services cannot be accommodated easily and efficiently, and the limited transmission capacity between the station device and the user device has been wasted.

In FIG. 9 described above, OH is an overhead for transmitting control data from the station device, # 1, # 2, # 3.
Is data. As shown in the figure, in the conventional transmission system, the cycle (one burst cycle) of the transmission / reception switching signal is fixed, and the data capacity of the downlink area is the same as the data capacity of the uplink area.

The present invention is intended to solve such a problem of the prior art. For example, the downlink region and the uplink region in one burst period (one frame) can be arbitrarily changed to thereby provide, for example, a downlink region. In this way, various services can be accommodated flexibly and efficiently by a method such as transmitting video signals with a large amount of downlink data by reducing the uplink area and limiting transmission between the station apparatus and the user apparatus. The purpose is to make effective use of capacity.

(2) In the prior art, a plurality of user devices are connected to one station device, and for each user device, the uplink information and the downlink information have a one-to-one correspondence including the data capacity. Yes, there is no example of realizing broadcast (broadcast-type service).

In order to provide the same information to a plurality of user apparatuses when performing a service similar to the broadcast (broadcast-type service), a plurality of pieces of the same information are inserted into a downlink area. Although it was necessary to transmit, in this case, since the same information exists in the downstream area, the limited transmission capacity is not effectively used.

FIG. 10 shows a configuration of a downlink area and an uplink area in a conventional transmission system. In the figure, OH is an overhead for transmitting control data from the station device, and # 1, # 2,..., #N are data, respectively. As shown in the figure, in the conventional transmission system, for example, even when the user apparatuses # 2 and #n want to receive the same information, the same data # 2 and #n exist on the transmission path.

An object of the present invention is to solve such a problem of the prior art, and the same information is duplicated in a downlink area on a transmission path by sharing one piece of downlink information by a plurality of user apparatuses. Therefore, it is an object of the present invention to effectively utilize the limited transmission capacity between the station device and the user device.

(3) In the conventional technology, a plurality of user apparatuses are connected to one station apparatus, and the data capacity (transmission capacity) of uplink information and downlink information is symmetrical for each user apparatus. Service form, and there is no example of an asymmetric operation form.

In the prior art, an asymmetric service does not exist, but if an asymmetric service is to be performed, for example, a continuous signal of "0" or "1" is inserted into an empty area to thereby reduce the data capacity. It is necessary to perform the service in a symmetric transmission form by making the same for uplink and downlink, but in this case, unnecessary data exists on the transmission path to match the data capacity of uplink and downlink. Does not effectively use the limited transmission capacity.

FIG. 10 shows the structure of the downlink region and the uplink region in the conventional transmission system.
As illustrated, the uplink and downlink data capacities in each user apparatus are the same.

The present invention is intended to solve such a problem of the prior art. By recognizing the uplink data capacity and the downlink data capacity, the downlink data capacity differs from the uplink data capacity. An object of the present invention is to perform asymmetric transmission so that limited transmission capacity can be effectively used.

[0022]

[Means for Solving the Problems]

(1) In a transmission apparatus using the time division multiplexing method and the time division multiple access method, in the related art, the downlink region and the uplink region constituting one burst period (one frame) have a fixed length. In the case, the length of the upstream region and the downstream region during one burst period can be arbitrarily changed so that the downstream region is long and the upstream region is short, or conversely, the downstream region is short and the upstream region is short. In the case of various service forms, such as a case where the area is long, the information can be transmitted by performing the service efficiently and flexibly. According to the present invention, a limited transmission path capacity (data capacity) can be used effectively.

FIG. 1 shows a burst configuration on a transmission line according to the present invention (variable capacity transmission method).
2 shows an example in which the burst cycle is variable and the uplink and downlink data capacities are different, corresponding to the conventional case shown in FIG. In the figure, (a) shows a case where the data capacity of the downlink area is large, and (b) shows a case where the data capacity of the uplink area is large.

The station apparatus specifies the length of the downlink area by the number of bytes to each user apparatus by the DSW signal of the OH section of the downlink area, so that each user apparatus recognizes the length of the downlink area. And an up area is recognized from now on. Further, each user equipment recognizes a position to transmit uplink data from a position at the end of downlink data by a DSN signal transmitted for each user equipment included in the OH part of the station apparatus, and designates a position to transmit the uplink data from the end position. The respective uplink data is transmitted to the designated positions.

Each user equipment recognizes the DSW and other downstream OH parts, and notifies the station equipment that it has been normally received. The station device confirms that all currently connected user devices are normal, and varies the burst cycle.

(2) In a transmission device using the time division multiplexing method and the time division multiple access method, when a plurality of user devices share the same downlink information (broadcasting, broadcasting type service), the user By recognizing information sharing and extracting information, transmission is performed so that one piece of downlink information is shared by a plurality of user apparatuses. According to the present invention, a limited transmission path capacity (data capacity) can be used effectively.

FIG. 2 shows a burst configuration on a transmission line according to the present invention (broadcast communication method), which corresponds to the conventional case shown in FIG. An example is shown. As shown, user devices # 1 and #
In the case where the broadcast communication is performed with respect to No. 3, the broadcast area exists in the downlink area, but the signals of # 1 and # 3 in the uplink area include frame bits and information bits of the user apparatus. (SUBOH) only exists. ADVANTAGE OF THE INVENTION According to this invention, since the data capacity of transmission / reception decreased by sharing the downlink information, the other service capacity can be increased or a user apparatus can be added.

In the station apparatus, the UCH of the OH section in the downlink area
The D and DCHD signals are used to notify the data capacity and the presence / absence of broadcast (broadcast type service) to each user device. If there is broadcast communication, a broadcast area is generated in the downlink area, and broadcast data is inserted (a plurality of broadcast services can be inserted).

Each user device recognizes the data position to be taken out by the DSN and USN signals. If there is a broadcast (broadcasting service), HDSN
Based on the signal, the location of the broadcast data to be extracted is recognized, and the data is extracted by designating the location to be extracted and the data capacity.

When each user device receives the same broadcast service, the same broadcast data can be extracted by designating the same HDSN for each user device. As a result, broadcast (broadcast-type service) can be performed without repeatedly sending the same service to the downstream area on the transmission path.

(3) In a transmission apparatus using the time division multiplexing method and the time division multiple access method, when the user equipment provides a service in which the uplink information and the downlink information are asymmetric, the user equipment transmits the uplink data to the user equipment. Transmission and reception are performed by recognizing the capacity and the downlink data capacity, respectively, and asymmetric transmission in which the uplink data capacity and the downlink data capacity are different is performed. According to the present invention, the limited transmission path capacity (data capacity) on the transmission path can be used effectively.

FIG. 3 shows a burst configuration on a transmission line according to the present invention (a method for transmitting an asymmetric service). The burst configuration corresponds to the conventional case shown in FIG. 10 and is applied to asymmetric transmission. An example is shown. As illustrated, the terminal devices # 1 and # 3 are operating an asymmetric service, and #
2, #n are operating a normal symmetric service.

In the station apparatus, the DCOH and UCHD are designated for each user apparatus in the OH section of the downlink area. By specifying the downlink data capacity (station device → user device) by the DCHD signal and specifying the uplink data capacity (user device → station device) by the UCHD signal, the Asymmetric transmission is performed by recognizing the data capacity and the downlink data capacity.

Each user equipment recognizes the data position to be taken out by the DSN signal, recognizes the data capacity to be received by the DCHD signal,
Data transmission / reception is performed by recognizing the data capacity to be transmitted by the HD signal and recognizing the data transmission position by the USN signal. In the station device, these information (DSN, USN, DCHD, UCH
D). As a result, it is possible to perform asymmetric service transmission in which the uplink data capacity and the downlink data capacity are different.

Hereinafter, specific means and actions for solving the problems of the present invention will be described.

(1) A station device and a plurality of user devices are connected by one transmission line, and a time difference is provided between a downlink region from the station device to the user device and an uplink region from the user device to the station device, and a burst is provided for each burst. In a transmission device that performs time-division transmission and performs transmission and reception so that uplink information from each user device is aligned without overlapping in the station device, in the downlink region, the width of the downlink region and the downlink data capacity for each user device are Change, and notify each user device of the respective downlink and uplink data capacities, each user equipment receives the designated downlink data capacity, and each user equipment receives the designated data capacity in the uplink area. , The burst period on the transmission path can be arbitrarily changed, and the downlink region and the uplink region can be arbitrarily changed. .

By doing so, it is possible to realize a variable capacity transmission method in which the down region and the up region in one burst period are arbitrarily changed.

(2) A station device and a plurality of user devices are connected by one transmission path, and a time difference is provided between a downlink region from the station device to the user device and an uplink region from the user device to the station device, and the time difference is set for each burst. In a transmission device that performs time division transmission and performs transmission and reception so that uplink information from each user device is aligned without overlapping in a station device, data of broadcast communication for a plurality of user devices is broadcast in a broadcast region in a downlink region. By transmitting the broadcast information and notifying the transmission position of the broadcast data in the data area for each user device, a broadcast for transmitting the same information to a plurality of user devices in common is performed.

In this manner, a broadcast communication (broadcast service) in which a plurality of user devices share the same information can be realized.

(3) A station device and a plurality of user devices are connected by one transmission path, and a time difference is provided between a downlink region from the station device to the user device and an uplink region from the user device to the station device, and a burst is provided for each burst. In a transmission apparatus that performs time division transmission and performs transmission and reception so that uplink information from each user apparatus is aligned without overlapping in a station apparatus, a downlink data capacity and an uplink data capacity are specified in an overhead section of a downlink area. Thus, transmission of an asymmetric service having different downlink data capacity and uplink data capacity is performed between the station apparatus and each user apparatus.

By doing so, it is possible to realize transmission of an asymmetric service having different downlink data capacity and uplink data capacity.

[0042]

FIG. 4 shows the configuration of a station device according to an embodiment of the present invention. FIG. 5 shows a configuration of a user device according to an embodiment of the present invention. An apparatus configuration according to an embodiment of the present invention will be described below with reference to both drawings.

In the station device 1, the control / monitoring unit 11
The overall control of the station device 1 and the operation monitoring of the station device and the user device are performed. In the OH generating unit 12, based on an instruction from the control / monitoring unit 11, SYSOH, DSW, ID, DSN,
Each signal of USN, DCHD, and UCHD is generated. OH
The combining unit 13 combines the signals generated by the OH generating unit 12.

The broadcast OH section 14 generates overhead information for broadcast communication (broadcast type service) based on an instruction from the control / monitoring section 11. Broadcast data section 1
5 generates data for broadcast (broadcast type service). The data unit 16 generates data for the opposite communication (symmetric service, asymmetric service). The synthesizing unit 17 includes overhead information for broadcast from the broadcast OH unit 14,
The data for broadcast communication from the broadcast data section 15 and the data for opposite communication from the data section 16 are combined. OH
The data synthesizing unit 18 synthesizes the overhead information from the OH generating unit 13 and the data information from the synthesizing unit 17.

The scrambler 19 scrambles the entire overhead information and data information from the OH / data combining section 18. The frame generator 20 generates a downstream frame. The combining unit 21 combines the information scrambled by the scrambler unit 19 and the frame bits to generate a downstream frame. Optical module 22
Converts the combined downstream frame into an optical signal and sends it to the optical transmission path 23.

In the user device 2, the optical module 24
Receives an optical signal transmitted through the optical transmission line 23. The frame detection synchronization protection unit 25 extracts frame bits from the downstream frame output from the optical module 24,
Perform synchronization protection. The descrambler 26 descrambles downstream frames. The OH / data / broadcast separation unit 27 separates overhead, data for opposite communication, and data for broadcast communication from a downstream frame.

The OH processing / detection / protection unit 28 operates to detect each piece of information of the overhead and to perform synchronization protection to recognize the information. The data unit 29 extracts the data for the opposite communication, and the broadcast data unit 30 extracts the data for the broadcast communication. Format conversion / reordering unit 3
1 performs format conversion and rearrangement of the extracted data for the opposite communication and the data for the broadcast communication, and sends the data to the designated channel board.

On the other hand, the data section 32 generates data to be transmitted from the user device 2 to the station device 1. The OH generation unit 33 generates the overhead of the upstream frame including the processing result such as the overhead information detected from the downstream frame by the OH processing / detection / protection unit 28. OH
The data combining unit 34 combines the overhead and the data. The scrambler 35 scrambles the combined overhead and data.

The frame generator 36 generates an upstream frame. The combining unit 37 combines the generated frame bits with the scrambled overhead and data to generate an upstream frame, and inputs the upstream frame to the optical module 24. The optical module 24 converts an input signal into an optical signal and sends out the optical signal to the optical transmission line 23.

In the station device 1, the optical module 22
The optical signal from the optical transmission line 23 is received. The frame detection synchronization protection unit 38 detects a frame bit from the upstream frame output from the optical module 22 and performs synchronization protection. The descrambler 39 descrambles the upstream frame.

The OH / data separating section 40 separates overhead and data from the upstream frame. The OH processing / detection / protection unit 41 performs overhead processing to detect each signal and perform synchronization protection. Format conversion
The reordering unit 42 performs format conversion and reordering on the separated data. The data unit 43 sends the data after the format conversion and the rearrangement to a higher-level device (such as an exchange).

The PG unit 44 in the station device 1
Generates an internal clock. The PG unit 45 in the user device 2 generates an internal clock in the user device 2 in synchronization with the clock extracted from the downstream frame.

FIGS. 6 and 7 are diagrams (1) and (2) showing the frame structure in the present invention, which are applied to the variable capacity transmission method, the broadcast communication method and the asymmetric service transmission method. FIG. 6 shows the configuration of a downlink frame, and FIG. 7 shows the configuration of an uplink frame.

In the OH part of the downstream frame shown in FIG. 6, SYSOH is a system overhead. DS
W is information for specifying the width of the downlink area. The ID is a number that identifies the user device. DSN is information for specifying the start position of the CH data in the downlink frame. U
SN is information that specifies the transmission start position of the uplink frame. DCHD is information for specifying the downlink data capacity and the presence or absence of a broadcast service. UCHD is information for specifying the uplink data capacity and the presence or absence of a broadcast service.

In the data area of the downstream frame, HOSOOH of the broadcast area is overhead for the broadcast area. HCH # 1 is data of a broadcast service. In data # 1 to #n for each user device in the data area, SUBOH is an overhead of each user device. HDSN is information for specifying the start position of broadcast data in a downstream frame. The CH is normal symmetric service and asymmetric service data for each user equipment.

In the upstream frame shown in FIG. 7, # 1 indicates that the broadcast (# 1) has been received. # 2
Shows a case where a normal opposite (symmetric service) communication is received. # 3 indicates a case where the broadcast (# 1, # 2) is received. # 4 shows a case where the broadcast communication (# 2), the normal opposite (symmetric service) communication, and the asymmetric service communication are received. #N indicates a case where a normal opposite (symmetric service) communication is received.

[0057]

As described above, according to the present invention, a signal having the same wavelength is used for uplink information and downlink information, and a time difference is provided in the time for transmitting information, so that one piece of uplink information and downlink information is used. In a transmission apparatus using a time division multiplexing method and a time division multiple access method for transmission / reception via a transmission line (optical fiber), a variable capacity transmission method for arbitrarily changing a downlink region and an uplink region in one burst period is realized. Therefore, various services can be flexibly and efficiently accommodated, and the limited transmission capacity between the station device and the user device can be effectively used.

Further, according to the present invention, in a transmission apparatus using the time division multiplexing method and the time division multiple access method,
By sharing the information of the downlink region in one burst period with a plurality of user devices, a plurality of user devices can perform a broadcast communication (broadcast type service) in which the same information is shared, and perform a broadcast communication. In this case, by sharing the downlink information, it is possible to effectively use the transmission capacity between the station device and the user device, so that the transmission capacity per user device within the limited transmission capacity is increased. And the number of user devices can be increased.

Further, according to the present invention, a transmission apparatus using the time division multiplexing system and the time division multiple access system recognizes the uplink and downlink data capacities,
Since it is possible to perform transmission of an asymmetric service having different downlink data capacity and uplink data capacity, various types of services can be operated, and it is necessary to perform unnecessary capacity transmission by performing the asymmetric service. Therefore, the transmission capacity between the station device and the user device can be used effectively, and the transmission capacity per user device within the limited transmission capacity can be increased. Expansion can be performed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a burst configuration on a transmission path according to the present invention (variable capacity transmission method), where (a) shows a case where the data capacity of a downlink area is large, and (b) shows a case where the data capacity of an uplink area is large. Shows the case where there are many.

FIG. 2 is a diagram showing a burst configuration on a transmission path according to the present invention (broadcast method).

FIG. 3 is a diagram illustrating a burst configuration on a transmission path according to the present invention (a method for transmitting an asymmetric service).

FIG. 4 is a diagram illustrating a configuration of a station device according to an embodiment of the present invention.

FIG. 5 is a diagram illustrating a configuration of a user device according to an embodiment of the present invention.

FIG. 6 is a diagram (1) showing a frame configuration according to the present invention.

FIG. 7 is a diagram (2) showing a frame configuration in the present invention.

FIG. 8 is a diagram illustrating a configuration example of a conventional transmission system to which the present invention is applied.

FIG. 9 is a diagram showing a burst configuration on a transmission line in a conventional transmission system.

FIG. 10 is a diagram showing a configuration of a downlink region and an uplink region in a conventional transmission system.

[Explanation of Signs] 1 station apparatus 2, _{1, 2,} 2, ₃ user apparatus 3 optical transmission line 4 branching element

Claims (3)

[Claims] 1. A station apparatus and a plurality of user apparatuses are connected by a single transmission line, and a time difference is provided between a downlink area from the station apparatus to the user apparatus and an uplink area from the user apparatus to the station apparatus, and a time difference is set for each burst. While split transmission,
In a transmission device that performs transmission and reception so that uplink information from each user device is aligned without overlapping in the station device, in the downlink region, while changing the width of the downlink region and the downlink data capacity for each user device, By notifying the user equipment of the respective downlink and uplink data capacities, each user equipment receives the specified downlink data capacity, and each user equipment transmits the specified data capacity in the uplink area. A variable capacity transmission method in a time-division transmission system, wherein a burst period on a transmission path is arbitrarily changed, and the downlink region and the uplink region are arbitrarily changeable. 2. A station apparatus and a plurality of user apparatuses are connected by one transmission path, and a time difference is provided between a downlink area from the station apparatus to the user apparatus and an uplink area from the user apparatus to the station apparatus, and a time difference is set for each burst. While split transmission,
In a transmission device that performs transmission and reception so that uplink information from each user device is aligned without overlapping in the station device, while transmitting broadcast data for a plurality of user devices to a broadcast region in the downlink region, In the time division transmission system according to the time division transmission system, the same information is transmitted in common to a plurality of user devices by notifying the transmission position of the broadcast data in a data area for the user device. Information communication method. 3. A station device and a plurality of user devices are connected by one transmission path, and a time difference is provided between a downlink region from the station device to the user device and an uplink region from the user device to the station device, and a time difference is set for each burst. While split transmission,
In a transmission apparatus that performs transmission and reception so that uplink information from each user apparatus is aligned without overlapping in a station apparatus, the overhead section of the downlink area specifies the downlink data capacity and the uplink data capacity, thereby An asymmetric service transmission method in a time-division transmission system, characterized in that an asymmetric service having different downlink data capacity and different uplink data capacity is transmitted between a device and each user device.