EP0934674A1 - Procede et dispositif de conversion de format pour la conversion de format en continue de cellules atm avec informations d'utilisateur en blocs de message d'une interface radio d'un reseau radio numerique - Google Patents

Procede et dispositif de conversion de format pour la conversion de format en continue de cellules atm avec informations d'utilisateur en blocs de message d'une interface radio d'un reseau radio numerique

Info

Publication number
EP0934674A1
EP0934674A1 EP97910249A EP97910249A EP0934674A1 EP 0934674 A1 EP0934674 A1 EP 0934674A1 EP 97910249 A EP97910249 A EP 97910249A EP 97910249 A EP97910249 A EP 97910249A EP 0934674 A1 EP0934674 A1 EP 0934674A1
Authority
EP
European Patent Office
Prior art keywords
radio
blocks
aip
user data
atm cells
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP97910249A
Other languages
German (de)
English (en)
Inventor
Thomas Zimmermann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0934674A1 publication Critical patent/EP0934674A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0478—Provisions for broadband connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5603—Access techniques
    • H04L2012/5604—Medium of transmission, e.g. fibre, cable, radio
    • H04L2012/5607—Radio
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5646—Cell characteristics, e.g. loss, delay, jitter, sequence integrity
    • H04L2012/5652—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5672—Multiplexing, e.g. coding, scrambling

Definitions

  • Method and format conversion device for the continuous format conversion of ATM cells with useful information in radio blocks of a radio interface of a digital radio network
  • the invention relates to a method and a format conversion device for the continuous format conversion of ATM (Asynchronous Transfer Mode) cells with useful information in radio blocks of a radio interface of a digital radio network.
  • ATM Asynchronous Transfer Mode
  • the currently existing mobile radio systems such as GSM (Global System for Mobile Communications) are not designed for ATM traffic.
  • the DECT (Digital European Cordless Telephone) wireless telephony system has not previously been intended for broadband ATM traffic, but rather has been designed for a wireless subscriber connection for voice transmission mainly for use in rooms.
  • the invention is based on the object of specifying a conversion method with which ATM cells can be transmitted to mobile or radio-connected stationary subscribers with the best possible use of the radio blocks defined in the radio interface.
  • the radio blocks are subdivided into a sufficiently fine sub-grid, and start times of the user data blocks within a radio block are defined in the organization blocks.
  • the sub-grid - defined by bit positions, defined fractions of bit positions or multiples of bit positions - makes it possible to keep dead times of the user data blocks within a radio block to a minimum.
  • a fixed number of bits of the respective user data block is assigned
  • An alternative method according to the invention for the continuous format conversion of ATM cells into radio blocks provides to create useful data blocks for the transmission of the useful information within the radio blocks and to fix fixed start times of the useful data blocks. Due to the fixed start times of the user data blocks, the signaling effort reduced. One or more possible start times can be specified.
  • a radio block type is used for information transmission if the bit rate of the user data block is greater than or equal to the bit rate of the ATM cells.
  • a radio block type with the next higher permissible bit rate is used for transmission if the bit rate of the user data blocks of a traffic relationship is lower than the bit rate of the ATM cells.
  • the user data blocks are only partially filled with user information of the ATM cells if the bit rate of the user data blocks of a traffic relationship is greater than the bit rate of the ATM cells.
  • radio blocks are combined by multiplexing into one channel, by occupying several radio blocks in a TDMA (time division multiple access) system, by several parallel channels of the same frequency in a CDMA (code division multiple access) system or by several parallel channels of different types Frequency in a FDMA (frequency division multiple access) system.
  • TDMA time division multiple access
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • ATM cells are transmitted via an ISDN or broadband ISDN transmission system and are fed to a base station for the radio system.
  • the invention is explained in more detail below on the basis of exemplary embodiments.
  • the mobile communication system shown in FIG. 1 is a radio network based on the known GSM mobile radio system, which consists of a multiplicity of mobile switching centers MSC which are networked with one another or which provide access to a fixed network or other network PSTN. Furthermore, these mobile switching centers MSC are each connected to at least one base station controller BSC. Each base station controller BSC in turn enables a connection to at least one base station BS.
  • a base station BS is a radio station which can set up a communication link to mobile stations MS via a radio interface.
  • Such a radio connection to a mobile station MS is shown as an example in FIG.
  • the radio interface between base station BS and mobile station MS is organized according to the time-division multiplex method. For example, eight time slots are provided on a carrier frequency, which can be used for different communication connections and for organizing the radio interface. If a base station also provides several carrier frequencies, there is also a frequency division multiplex.
  • a format conversion of ATM cells transmitted by the fixed network PSTN into the radio blocks of the radio interface is to take place.
  • This conversion takes place in a format conversion device FU, which is assigned to the base station controller BSC.
  • the format conversion device FU can alternatively also be implemented in a mobile switching center MSC or in an independent coding conversion device.
  • the technical implementation of such format conversion devices FU are known to the person skilled in the art from the corresponding specialist literature.
  • the method according to the invention for converting the format of ATM cells with useful information into radio blocks of a radio interface for future mobile radio standards such as FPLMTS (Future Public Land Mobile Telecommunications System) and UMTS (Universal Mobile Telecommunications System) is particularly relevant.
  • the most important criterion for assessing the transmission quality of a radio channel is the bit error rate BER as a function of the signal-to-noise ratio S / N.
  • a specific signal-to-noise ratio is required for a specific bit error rate BER and vice versa.
  • the signal-to-noise ratio In order not to exceed a certain bit error rate, the signal-to-noise ratio must not fall below a certain value.
  • the so-called called automatic repetition request procedure ARQ procedure.
  • FEC Forward Error Correction
  • AIP Air Interface Packet
  • This also applies to the existing GSM and DECT mobile radio systems, which as TDMA systems handle several connections on one RF carrier. This means that other connections are processed between the radio blocks of a traffic relationship and thus pauses occur between the radio blocks of a traffic relationship which depend on the number of total connections per carrier.
  • Other systems use CDMA methods, in which many traffic relationships with spread signals are transmitted simultaneously and without gaps in a continuous sequence and without pauses.
  • the uncoded basic scheme of the radio block structure is the same for both types of transmission.
  • a radio block AIP with the duration T AIP consists of three parts: the user data block N PLD , which contains the data to be transmitted (user information - for example voice information) and possibly an organizational block, the preamble T3 mR , the
  • N TAIL I which is provided for error protection (FEC) and possibly for the TDMA method at least partially for signalless switching times (eg switching the transmitter on and off, time reserve and protection time).
  • FEC error protection
  • TDMA time division multiple access
  • Type 2 All AIP radio blocks have the same number of bits, e.g. 160 useful bits, a preamble of 15 bits and a remaining block of 6 bits. They differ in their duration, see Table 2, according to the bit rates of the participants to be transmitted. It should be noted that to implement an ISDN connection, it is necessary to combine two channels with 64 Kbit / s each and one channel with 16 Kbit / s by multiplexing.
  • the block formats In order to transmit ATM cells via radio interfaces, the block formats must be converted.
  • One possibility according to the invention is the cell division of the ATM cells.
  • the shortened ATM cells are divided into parts of equal size and distributed evenly over the radio blocks AIP.
  • Tables 6 and 7 show the Properties for the previously discussed two groups of AIP radio blocks.
  • the implementation of the format of ATM cells in AIP radio blocks should in principle be carried out continuously and as quickly as possible. If e.g. If the useful bit rate of the radio subscriber is the same as the useful bit rate of the ATM subscriber, the radio blocks AIP are completely filled. If not, the radio blocks AIP are only partially filled, depending on the data rate and the start times of the ATM cells. In order to find the start time of a shortened ATM cell in a radio block AIP, additional information must be transmitted within the radio block AIP.
  • Table 3 shows the various parameters of the first group of AIP radio blocks, which have the same length of time and were presented in Table 1.
  • Table 4 shows various parameters of the second group of radio blocks AIP, which have an equal number of bits and were presented in Table 2.
  • An address of 8 bits is required. This means that 5% of the transmission capacity has to be used for addressing.
  • 152 bits can be used for the transmission of ATM data; at an ATM bit rate of 3.8 Kbit / s.
  • This requires an AIP radio block with a duration of 152 bits / 3.8 kbps 40 ms.
  • a sub-grid is used within the user data block (information part) of the radio blocks to perceive any start times.
  • the format conversion of the ATM cells into the structures of the radio blocks AIP thus takes place without a time delay.
  • a fixed amount of bits per AIP radio block is used for addressing and organizing the format conversion.
  • each radio block AIP has in its information part a fixed, temporal sub-grid of positions at which a shortened ATM cell can begin.
  • This sub-grid always starts at the beginning of an information section. Since only multiples of this sub-grid can be used to start a data transfer, a sufficiently fine-grained sub-grid is required.
  • the parameters are created, which are set out in Table 5.
  • a 5 bit address is required for the continuous identification of the sub-grid. 175 bits are thus available for the user information.
  • the properties of this unrestricted implementation scheme are more favorable for the last three types with a useful information of 360, 720 and 1440 bits.
  • the unrestricted implementation method has the advantage that the ATM cells arriving from the ISDN network in the radio network are only inserted into the radio transmission protocol with a delay of up to 8 bits.
  • a sub-block of, for example, 20 bits per radio block for each radio block type can be introduced as an assigned organization channel for the organization of the format conversion.
  • the unrestricted implementation method for ATM cells in radio blocks has the following advantageous properties: If the subscriber bit rate of the radio subscriber is less than or equal to the permissible ATM bit rate of one of the available radio block types, this radio block type is used. In this case, the radio blocks are filled with shortened ATM cells, as described above.
  • the radio blocks are only partially filled with useful information, depending on the data rate of the ATM cells.
  • the radio block type with the next higher allowable ATM bit rate is used for transmission.
  • radio blocks can be combined to form a useful channel in order to realize higher transmission rates. This can be done either by multiplexing in one channel, by occupying several radio blocks in a TDMA system, by several parallel channels of the same frequency in a CDMA system or by several parallel channels of different frequencies in an FDMA system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé pour la conversion de format en continue de cellules ATM avec informations d'utilisateur en blocs de message d'une interface radio d'un réseau radio numérique comprenant des abonnés mobiles ou fixes reliés par radio. Dans les blocs de message, des blocs de commande présentant une quantité fixe de bits sont prévus pour l'adressage et la commande de blocs de données utilisateur, les blocs de message sont subdivisés en une sous-trame suffisamment fine, et les moments de départ des blocs de données utilisateur se trouvant dans un bloc de message sont spécifiés dans les blocs de commande. Dans une variante, des moments de départ fixe des blocs de données utilisateur sont spécifiés.
EP97910249A 1996-10-24 1997-10-02 Procede et dispositif de conversion de format pour la conversion de format en continue de cellules atm avec informations d'utilisateur en blocs de message d'une interface radio d'un reseau radio numerique Withdrawn EP0934674A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19644305 1996-10-24
DE19644305 1996-10-24
PCT/DE1997/002268 WO1998018284A1 (fr) 1996-10-24 1997-10-02 Procede et dispositif de conversion de format pour la conversion de format en continue de cellules atm avec informations d'utilisateur en blocs de message d'une interface radio d'un reseau radio numerique

Publications (1)

Publication Number Publication Date
EP0934674A1 true EP0934674A1 (fr) 1999-08-11

Family

ID=7809921

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97910249A Withdrawn EP0934674A1 (fr) 1996-10-24 1997-10-02 Procede et dispositif de conversion de format pour la conversion de format en continue de cellules atm avec informations d'utilisateur en blocs de message d'une interface radio d'un reseau radio numerique

Country Status (4)

Country Link
EP (1) EP0934674A1 (fr)
JP (1) JP2001502507A (fr)
KR (1) KR20000052760A (fr)
WO (1) WO1998018284A1 (fr)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5568482A (en) * 1994-11-23 1996-10-22 Yurie Systems, Inc. Low speed radio link system and method designed for ATM transport

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9818284A1 *

Also Published As

Publication number Publication date
KR20000052760A (ko) 2000-08-25
WO1998018284A1 (fr) 1998-04-30
JP2001502507A (ja) 2001-02-20

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