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Short cell multiplexer

A cell multiplexer and cell technology, applied in the field of multiplexers, can solve problems such as difficulty in processing

Inactive Publication Date: 2003-09-03
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is therefore very difficult to perform the process of changing the read band setting

Method used

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  • Short cell multiplexer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] First, the embodiment 1 of the present invention will be discussed.

[0069] [Example of network system structure]

[0070] figure 1 It is a diagram showing an example of the structure of a network system in which the short cell multiplexer 40 according to the first embodiment is embedded. See figure 1 , Which shows a plurality of wireless terminal devices 30, a wireless base station 31, an ATM network 32 connected to the wireless base station 31, a distribution station 33 connected to the ATM network 32, and a plurality of terminals connected to the distribution station 33 Device 36 is a network system.

[0071] Each wireless terminal device 30 defined as a so-called mobile phone fills the short cell payload 3 of a plurality of short cells 1 (see FIG. 15) with voice data and image data, and transmits these short cells 1 to the wireless base station 31.

[0072] The wireless base station 31 receives each short cell transmitted from the wireless terminal device 30 through...

Embodiment 2

[0142] The short cell multiplexer according to Embodiment 2 will be discussed below. According to the prior art method and the method described in the embodiment, the short cell 1 stored in one of the FIFOs (short cell memory) 22a-22c is read, and the bit rate of the short cell 1 thus read becomes the actual Read the frequency band. On the other hand, short cell 1 is of variable length type. Therefore, the number of bits of the short cell 1 sent from the selector 19 in the signal reading process becomes different for each short cell. Thus, it may happen that the predetermined value of the reading frequency band (transmission frequency band) of the short cell 1 is different from the reading frequency band of the short cell 1 that is actually read (transmitted from the selector 19). Furthermore, the reading frequency band (of the short cell 1 in the signal reading process) should be set according to priority.

[0143] From the above, in the case where the short cell 1 stored in each...

Embodiment 3

[0186] The short cell multiplexer according to Embodiment 3 will be discussed below. For example, in the short cell multiplexer 40 of Embodiment 2, if the average length (average number of bytes) of short cell 1 belonging to a certain QOS level is shorter than the average length of short cell 1 belonging to other levels, if The credit setting value of the above other QOS levels is less than the credit setting value of the above specific QOS level, and the short cell 1 belonging to the specific QOS level is read in a series. Therefore, a deviation is caused in the transmission mode (read mode) of the short cell 1 belonging to each QOS level, and as a result, the transmission frequency band of the specific QOS level exceeds the predetermined frequency band. This may create the possibility that short cell 1 belonging to other QOS levels will be delayed for ATM cell combination. The short cell multiplexer of Embodiment 3 is designed to avoid this problem.

[0187]

[0188] The short ...

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Abstract

A short cell multiplexer includes a sequence designating unit, in which reading intervals corresponding to QOS classes are set in respective reading interval setting registers. A counter memory is stored with the number of timings at which the short cells can be read. The sequence designating unit specifies the QOS class in which the number of timings reaches the reading interval on the basis of the reading interval and the number of timings, and gives to a reading unit an indication of reading the short cell belonging to this class.

Description

Technical field [0001] The present invention relates to a multiplexer for multiplexing multiple short cells containing low bit rate on an ATM connection in communication using an ATM (Asynchronous Transfer Mode) network. Background technique [0002] Generally, communication using an ATM network is carried out by transferring ATM cells from a sending station to a receiving station. The ATM cell consists of a 5-byte header and a fixed-length data storage area defined as a payload of 48 bytes. The payload is to store user data. When transmitting in an ATM network, for each connection, ATM cells are assigned a destination (VPI / VCI: Virtual Path Identifier / Virtual Path Identifier). Therefore, the header of an ATM cell is only filled with information about one connection. [0003] By the way, in the field of mobile communications using wireless systems, information to be transmitted is embedded in the payload of ATM cells in a compressed coded state (cells are aggregated) in order to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04Q3/00H04J3/16H04L47/22H04L47/43H04L47/6275H04Q11/04
CPCH04L2012/5672H04L2012/5656H04L2012/5607H04J3/1682H04Q11/0478H04L2012/5651
Inventor 小野英明武智龙一加藤次雄佐佐木博佐佐木隆行
Owner FUJITSU LTD