WO2001089260A1

WO2001089260A1 - Secured dynamic bandwidth allocation in multichannel transmission systems

Info

Publication number: WO2001089260A1
Application number: PCT/DE2001/001879
Authority: WO
Inventors: Johann Wildmoser
Original assignee: Siemens Aktiengesellschaft
Priority date: 2000-05-19
Filing date: 2001-05-17
Publication date: 2001-11-22
Also published as: DE10024860A1; EP1283001A1

Abstract

The invention relates to secured dynamic bandwidth allocation in a multichannel transmission system such as a time- or frequency- multiplexed system, especially a SDSL transmission system (Symmetric Digital Subscriber Line) wherein digital information is transmitted in frames. For that purpose, the complete information for band allocation is transmitted in a secured way inside each frame. Moreover, it is possible to determine in an unambiguous way, for each frame, which is the channel allocated to a particular service. In the case where the channel allocation is modified, the relevant information is available early enough on the receiver side, so that the modified channel allocation can be taken into account as soon as the next frame is received.

Description

description

Secure dynamic bandwidth allocation in multi-channel transmission systems

The subject matter of the application relates to a method for secure dynamic bandwidth allocation in multichannel transmission systems, in particular time division multiplex or frequency division multiplex transmission systems, in which digital information is transmitted in frames.

Future multi-channel transmission systems, such as. B. SDSL (Symmetry Digital Subscriber Line) subscriber connections in telecommunications switching systems will adapt flexibly to the transmission channel and also dynamically adapt to

Allocate available bandwidth to different services.

In ^Λ Synchronous ISDN Transport over SDSL Frames, Dirk Daecke, Infineon Technologies AG, Günther Schauer, Siemens AG, ETSI TM6, TD29, 001t29rl, 28.2. -3.3.2000 ^Λ describes how various services are dynamically allocated to the channels of a time-division multiplex transmission system. The channel allocation between the exchange-side line termination and the subscriber-side network termination is controlled by exchanging messages that are transmitted in unsecured form. A disadvantage of this method is that if bit errors occur during the transmission of these messages, the channel assignment to the various services is subsequently disturbed, which greatly reduces the reliability.

The object of the application is based on the problem of specifying a method for a multichannel transmission system in which dynamic bandwidth allocation is ensured even when bit errors occur during transmission. ω> tt h- ¹ P ¹ Ji O tπ o Cn o Cn

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Using a concrete example, the SDSL system, it will now be shown how a secure dynamic bandwidth ^allocation can be achieved. The frame shown in Fig. 1 is characterized by a constant duration of 6 ms. The Syn ^¬ chronization and the overhead constant claim 8 kbit / s corresponding to 48 bits per frame. The payload is divided into 4 groups of 12 variable user data blocks and supports (0 ... 7) so-called Z channels with 8 kBit / s each and (3 ... 36) B channels with 64 kBit / s each.

It is proposed to use a Z channel as the "Dynamic Bandwidth Allocation Channel". This means that 48 bits per frame are constantly available for the transmission of the information required for a secure bandwidth allocation. They can be used advantageously in the following ways:

Dynamic bandwith allocation channel

BAF bandwidth allocation field

The "Bandwidth Allocation Field" (bits 1 to 32) shows the status of the channel assignment. All B channels used for voice services (ISDN BRA (Basic Rate Access) or POTS (Piain Old Telefon Service)) are identified by a 1 value at the corresponding bit position. All B channels marked with an O value are made available for the data pipe until the maximum number of channels supported by the SDSL system is reached.

ESF Error Supervision Field

With the "Error Supervision Field" (bits 33 to 40), error monitoring with individual error correction is carried out similarly to header protection for ATM (Asynchronous Transfer Mode) cells. Since multiple errors due to the time distribution ^* lung (see FIG 1) throughout the frame are very unlikely at 48 points per bit to 1 and an additionally carried out interleaving in the transceiver may be from a gesi ^¬ cherten dynamic bandwidth allocation can be assumed.

In case of changes of the channel assignment of the relevant information between 202 clock periods are at the receiver side after receiving (1 Z-channel + 3 B-channels) and 2314 Taktperio ^¬ (1 Z-channel + 36 B-channels) available to the modified Prepare channel assignment that starts from the next frame.

The remaining 8 bits are reserved for further tasks.

ESC Embedded Signaling Channel

In a further embodiment, an "embedded signaling channel" is thus set up, via which messages and data exchange between line termination and network termination are processed. This means that ISDN EOC messages, control signals for the S-Bus and other information on the use of the channels can be transmitted. For example, it can be communicated whether it is ISDN BRA or POTS voice services. Mixing of POTS and ISDN BRA can also be agreed. Furthermore, the data pipe can be subdivided, for example to support ATM traffic in addition to Ethernet-based traffic or to distribute the data traffic to different providers.

The necessary information for bandwidth allocation can be transmitted jointly for the entire frame or individually within the various user data blocks.

Claims

claims

1. A secure method of dynamic bandwidth allocation in multi-channel transmission systems, in particular time multiplex Plex or frequency division multiplex transmission systems are used in which digital information transmitted in frames characterized in that within each frame the complete information about the band ^¬ wide allocation is transmitted in a secure form.

2nd Method according to claim 1, where the frame has a plurality of user data blocks.

3. The method according to claim 2, characterized in that the information for bandwidth allocation is transmitted in the first transmitted half of the user data block.

4. The method according to claim 2 or 3, characterized in that the information transmission for bandwidth allocation is completed in the first transmitted half of the last user data block.

5. The method according to any one of the preceding claims, characterized in that the new channel assignment resulting from the information on bandwidth allocation takes effect from a certain number of subsequent frames.

6. The method according to any one of the preceding claims, characterized in that the multi-channel transmission system is given by an SDSL transmission system.

7. The method according to any one of the preceding claims, characterized in that s the information for bandwidth allocation is transmitted in a z-channel of the frame.