JPH03179944A - Multiple access system - Google Patents

Abstract

PURPOSE:To shorten the awaiting time of a receiver until receiving the leading part of long information and to transmit the long information to the receiver as a series of information by dividing the long information into blocks with prescribed length, and generating the information of each block repeatedly synchronizing with that of another block. CONSTITUTION:The blocks 11-1N are generated by dividing the long information into N parts. Then, the information of each block is generated repeatedly by synchronizing a time when the information is generated with an appropriate timing at a time when the information of the block just before is generated. When a reception request 4 arrives from the receiver, it is stored in a request holding area 3, When it is in the middle way of generating the information of a first block 11, the reception request 4 is held, and when a state where the information is generated from the leading part is set, the reception request 4 is transferred to a request display area 21, and the information of the first block 11 is transmitted from the leading part. When the generation of the information of the first block 11 is completed, the content of the request display area 21 is transferred to a request display area 22, and the information of a second block 12 is transmitted. Similarly, the information of each block is transmitted, and it results that the receiver can receive the long information.

Description

[Detailed description of the invention] [Industrial application field]

This invention relates to a multiple access method that allows multiple receivers to request reception at any time from one information source that repeatedly transmits very long information, such as video information or music information. be.

[Conventional technology]

FIG. 2 is a conceptual diagram showing a conventional multiple access system. In FIG. 2, reference numeral 1 indicates an information source that repeatedly generates information, such as a magnetic tape or record at a broadcasting station of a cable broadcasting service. 2 is a request display area in which data indicating the recipient is stored, indicating that information is being sent to the recipient shown here. Also, 3 is any time (random)
This is a request holding area that stores reception requests from recipients that have arrived at. 4 indicates an arriving reception request. Next, the operation will be explained. Conventionally, there are ways to obtain information from a single information source, such as movies and music, in a remote location through television broadcasts, radio broadcasts, cable broadcasts, etc.; , magnetic tape, record, etc., and only sequential output and repetition is possible. Therefore, a recipient who makes a random reception request will either receive the long information from the middle, or will be forced to wait until the beginning of the information held by the information source 1 is generated next. FIG. 2 is for explaining the operation in the case where, after the reception request 4 arrives, the information source 1 transmits the information from the beginning to the recipient. The information source 1 is repeatedly generating information (indicated by arrows in the figure), and is transmitting the information to the recipients displayed in the request display area 2. When information generation up to the last part of the information is completed, the information source l
Information is generated from the beginning again. At this time, if one or more arriving reception requests 4 exist in the request holding area 3, data indicating them is moved to the request display area 2, and information is transmitted to the recipient indicated by the data stored in the request display area 2. be done. Then, the reception request 4 that arrives while the information source 1 is in the middle of generating information is stored in the request holding area 3.

[Problem to be solved by the invention]

Conventional multiple access systems operate as described above, so if the time at which information is generated from information source 1 is fixed, even if the receiver randomly sends reception request 4, the requested information will not be obtained. Moreover, even when information is repeatedly generated, there is a problem that it takes a long time for the recipient to be able to obtain the information from the beginning of the information. This invention was made to solve the above problem, and when a receiver makes a random reception request to an information source that repeatedly generates the same information, the information is sent from the beginning. The purpose of the present invention is to provide a multiple access method that can shorten the time until it becomes possible to receive.

[Means to solve the problem]

The multiple access method according to the present invention divides long information in advance into a plurality of blocks of a predetermined length, provides M areas for each block to store reception requests that arrive from receivers, and stores information in each block. , the time when the information is generated is synchronized with the end of the information generation of the immediately preceding block at an appropriate timing, and the information is generated repeatedly. When a reception request arrives from the recipient, the reception request is sent to the block containing the beginning part of the long information, that is, the first block.
Store it in the area corresponding to the block. Furthermore, if a reception request exists in the area corresponding to the block when the first part of the information of each block is to be generated, the information of that block will not be sent to the receiver corresponding to this reception request. A reception request from a receiver that has started and completed the transmission of information for each block is transferred to an area corresponding to the next block.

[Effect]

In the multiple access method of this invention, long information is divided into blocks of a predetermined length, and the information in each block is generated repeatedly in synchronization with other blocks. To reduce the waiting time of a recipient until receiving the information, and to transmit long information to the recipient as a series of information.

【Example】

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 11 to IN are blocks created by dividing long information into N pieces, and 1st block is the first block (first block) having information starting from the head part of the long information. Further, the information of each block 11 to IN is generated repeatedly. 21 to 2N are request display areas where received requests are stored; 3 is a request holding area; 4
is a receive request. Next, the operation will be explained. Reception request 4 from a certain recipient
When the received request 4 arrives, the received request 4 is stored in the request holding area 3. If the information in the first block 11 is in the process of being generated, the reception request 4 will be put on hold. Once the generation of information in the first block 11 is completed and the information is generated from the beginning, the reception request 4 held in the request holding area 3 is transferred to the request display area 21. Then, the information in the first block 11 is transmitted from the beginning to the recipient corresponding to the reception request 4 displayed in the request display area 21. When the generation of information in the first block 11 is completed, the contents of the request display area 21 are transferred to the request display area 22. Here, the generation of information in the second block 12 is synchronized with the generation of information in the first block 11. In other words,
After the generation of information in the first block 11 is completed, the generation of information in the second block 12 is returned to the beginning with appropriate timing. Appropriate timing is a timing determined within a range that does not impair the continuity of long information and that ensures transfer control of the reception request 4. Then, the information in the second block 12 is sent to the recipient corresponding to the reception request 4 displayed in the request display area 22.
That is, the information is sent to the recipient who has completed receiving the information of the first block 11. Thereafter, in the same way, the information of a certain block is sent to the recipient displayed in the request display area corresponding to that block, and when the generation of the information of that block is completed, the reception request 4 is sent to the next block. be transferred. This operation is performed sequentially, and the recipient ends up receiving a long piece of information.

【Effect of the invention】

As explained above, according to the present invention, the multiple access method divides information into a plurality of blocks, the information in each block is synchronized and repeatedly generated, and the information is received when the information at the beginning of each block is generated. Since the information of the block is sent to the receiver for which the request exists, even if a reception request is made randomly from a remote location to an information source that has long information, it will be possible to receive the information from the beginning with a short waiting time. There is an effect that those who can obtain that information can obtain it. =8

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram for explaining the concept of a multiple access system according to an embodiment of the present invention, and FIG. 2 is a conceptual diagram for explaining the concept of a conventional multiple access system. 11~IN are blocks, 21~2N are request display areas,
3 is the request holding area. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. 'JIQ-

Claims (1)

[Claims] If multiple receivers make a request to receive the information at an arbitrary time to one information source that repeatedly generates the same information, In a multiple access method for transmitting information, the information is divided in advance into a plurality of blocks of a predetermined length, an area is provided for each block to store the reception request, and the information in each block is transmitted to other blocks. , and when there is a request to receive the information from the receiver, the request to receive the information is stored in a first area corresponding to the first block among the blocks. , when generating the head part of the information of each block, start transmitting the information of the block to the receiver corresponding to the reception request existing in the area corresponding to the block, and A multiple access system characterized in that a reception request corresponding to a recipient who has completed transmission of information is transferred to the area corresponding to the next block.