EP1228596A1 - Procede et systeme de communication pour evaluer la vitesse d'effacement d'un bloc de transmission de donnees a liaison descendante sur la base de mesures de liaison ascendante et de liaison descendante - Google Patents

Procede et systeme de communication pour evaluer la vitesse d'effacement d'un bloc de transmission de donnees a liaison descendante sur la base de mesures de liaison ascendante et de liaison descendante

Info

Publication number
EP1228596A1
EP1228596A1 EP00981158A EP00981158A EP1228596A1 EP 1228596 A1 EP1228596 A1 EP 1228596A1 EP 00981158 A EP00981158 A EP 00981158A EP 00981158 A EP00981158 A EP 00981158A EP 1228596 A1 EP1228596 A1 EP 1228596A1
Authority
EP
European Patent Office
Prior art keywords
station
fer
transmission frame
rxqual
error rate
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Withdrawn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
EP00981158A
Other languages
German (de)
English (en)
Inventor
Ulrich REFÜSS
Jörg HUTH
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
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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, Siemens Corp filed Critical Siemens AG
Publication of EP1228596A1 publication Critical patent/EP1228596A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector

Definitions

  • the invention relates to a method for determining the erasure rate of transmission frames according to the preamble of claim 1 and a communication system for executing such a method.
  • information for example voice, image information, or other data
  • the electromagnetic waves are emitted at carrier frequencies that lie in the frequency band provided for the respective system.
  • GSM Global System for Mobile Communication
  • the carrier frequencies are in the range of 900, 1800 and 1900 MHz.
  • UMTS Universal Mobile Telecommunication System
  • 3rd generation systems frequencies in the frequency band of approx. 2000 MHz are provided.
  • Frequency division multiplexing (FDMA), time slot multiplexing (TDMA) or a method known as code division multiplexing (CDMA) serve to differentiate the signal sources and thus to evaluate the signals.
  • a special form of GSM is an FDD (Frequency Division Duplex) transmission method. The transmission takes place in the upward direction (UL or uplink), ie from the mobile station to the base station, and in the downward direction (DL or downlink), ie from the base station to the mobile station, on different frequencies.
  • UL or uplink ie from the mobile station to the base station
  • DL or downlink downward direction
  • the operator has several frequencies or carriers at his disposal through which a connection can be established. Switching between such frequencies during a connection is referred to as frequency hopping.
  • the frequency hopping method is a powerful tool for improving the quat deed perceived by the user when transmitting signals and increasing the system capacity.
  • the performance of GSM networks as the currently best known example of a mobile TDMA / FDMA radio communication system, can be significantly improved by using frequency hopping methods.
  • the transmission frame extinction rate FER (FER: frame erasure rate) for the waiting direction can be easily implemented in the base station.
  • the transmission frame extinction rate FER is closely related to the Qualltat perceived by the user, but is not adequately covered by the GSM standard.
  • the transmission frame extinction rate FER-DL in the downward direction cannot be derived directly from the receive quality act RXQUAL-DL which can be determined by the mobile station, since the relationship between these two variables depends very much on a large number of factors, in particular on the number of hop frequencies.
  • the jump mode the environment, that is to say the external, environmental transmission influences between two communicating stations, and the mobile speed distribution or speed with which two communicating stations move relative to one another.
  • the GSM standard sees no functions or instructions for the measurement and transmission of transmission frame extinction rates FER-DL in the downward direction by the mobile stations. It is therefore generally impossible to assign the transmission frame extinction rate FER-DL to the downward direction, ie in the case of a transmission from a base station to a mobile subscriber station, to the base station or to an operating and maintenance center of a radio communication system determine. Therefore, there is currently no possibility for the operators of the GSM system to determine qualitative gains in the operating and maintenance center in the downward direction by frequency hopping methods in an appropriate framework.
  • the object of the invention is to record the transmission frame error rate, in particular transmission frame erasure rate, using measurement and estimation technology and to make it usable for improving communication systems.
  • This task is accomplished through a method of determining the
  • the proposed method makes it possible to determine m algorithms online, making direct use of the transmission frame error rate, in particular the transmission frame erasure rate, that is to say an indirect determination of a size which is related to the qualtt perceived by the user.
  • the understanding of transmitted voice in voice connections can also be improved.
  • the determined value m can be used particularly advantageously in an algorithm for handover and / or an algorithm for power control, so that ultimately the entire communication system can be controlled more effectively and more comfortably for the user.
  • FIG. 1 shows a block diagram of a mobile radio system
  • FIG. 2 shows an exemplary diagram of an RXQUAL-UL / FER-UL
  • FIG. 3 a flowchart to illustrate method steps of a method for determining and evaluating a transmission frame extinction rate for downward connections.
  • an exemplary mobile radio communication system consists of a multiplicity of mobile switching centers MSC which are networked with one another or which provide access to a fixed network PSTN. Furthermore, these mobile switching centers MSC are each connected to at least one device RNM (Radio Network Manager) for allocating radio resources. Each of these devices RNM in turn enables a connection to at least one base station BS.
  • the term base station is largely used as a location z. B. a transmitting antenna can be interpreted.
  • Such a base station BS can connect to other radio stations, e.g. Build mobile subscriber stations MS or other mobile and stationary devices.
  • At least one radio cell Z is formed by each base station BS. In the case of sectorization or hierarchical cell structures, several radio cells Z are also supplied per base station BS, e.g. for partial areas around the base stations BS.
  • connections VI, V2, V3 for transmitting useful information and signaling information between mobile subscriber stations MSI, MS2, MS3, MSn and a base station BS are shown as examples.
  • Maintenance center OMC implements control and maintenance functions for the cellular network or for parts of it.
  • the functionality of this structure can be transferred to other communication systems, in particular radio communication systems, where the following method can be used. especially for subscriber access networks with wireless subscriber connection. ⁇ • ⁇
  • a reception quality determination device RX-M for determining the reception quality RXQUAL is provided both in the mobile subscriber stations MS and in the base stations BS.
  • the reception quality in the downlink direction RXQUAL-DL of a signal received by a subscriber station MS is thus determined in the subscriber stations and forwarded to the communicating base station BS for further processing.
  • the reception quality in the uplink direction RXQUAL-UL of a signal received by a base station BS is also determined.
  • a transmission frame error rate determination device FER-M for determining a transmission frame error rate FER-UL in an uplink between a subscriber station MS and a base station BS communicating with it is set up in a manner known per se in at least one of the devices of the radio communication system.
  • At least one evaluation device for evaluating and / or processing both the reception quality RXQUAL-UL and the transmission frame error rate FER-UL is set up in the communication system.
  • the evaluation device or an additional device X has a look-up table and takes on an additional function, which is described below.
  • Such an evaluation device X is preferably set up in each base station BS or also in the operating and maintenance center OMC.
  • FER transmission frame error rate
  • FER transmission frame erasure rate
  • the evaluation device X After it has been set up for each radio cell Z to a plurality of connections in the case of uplink transmissions from a subscriber station MS to the base station BS, captures both the information on the reception quality rate in the uplink direction RXQUAL-UL, that is to say the raw bit error rate, as also the transmission frame extinction rate in the upward direction FER-UL.
  • This information is entered in the look-up table, comparable to the diagram in FIG. 2.
  • the ratio of RXQUAL-UL and extinction rate FER-UL of a specific cell in the waiting direction can be taken into account even without manual tuning.
  • the look-up table therefore contains statistical information for each individual radio cell Z on previously determined values of the receive quality rate RXQUAL (-UL) and the transmission frame extinction rate FER (-UL), which are directly related to one another. These reference values apply to the special transmission conditions of the respective radio cell Z and are therefore essentially independent of the direction of transmission UL or DL.
  • the statistical information in the look-up table takes into account, in particular for the assigned radio cell Z, its special number of hop frequencies, its hop mode, its ambient conditions and suitable mobile speed distributions in its area.
  • the look-up table ultimately includes an overview of the most likely combinations of transmission frame extinction rate FER and the measured receiving frequency RXQUAL, taking into account the large number of cell-specific parameters.
  • FER-DL transmission frame extinction rate in the downward direction
  • RXQUAL-DL is known from the look-up table.
  • the transmission frame extinction rate in the downward direction FER-DL can be estimated or determined. This estimated value FER-DL can then be used directly to control the communication system or the current communication connection.
  • the lookup table is preferably continuously updated after its initialization phase.
  • the transmission conditions in individual radio cells Z can change as a function of time. For example, the
  • the two values of the transmission frame extinction rate in the downward and upward direction FER- DL or FER-UL and / or their relationship to one another can be used directly in various algorithms for controlling the communication system or individual connections.
  • the transmission frame extinction rate in the downward direction FER-DL may originate from a direct measurement or may have been determined indirectly as described above.
  • the transmission frame extinction rate in the upward direction FER-UL is preferably measured directly.
  • the transmission frame erasure rate in the downward direction FER-DL and / or, if required, the transmission frame erasure rate in the upward direction FER-UL can be used advantageously for determining the online network performance at an operation and maintenance center OMC on a statistically relevant basis.
  • the transmission frame erasure rates in the up and / or down direction FER-UL or FER-DL can also be used within control algorithms of the radio communication system, e.g. m algorithms for power control or for transferring connections from a base station BS to an adjacent base station BS.
  • reception quality RXQUAL-UL and the transmission frame extinction rate FER-UL is shown in FIG. 2 as an example.
  • the reception case quality / transmission frame extinction rate level or RXQUAL-UL / FER-UL level is subdivided into several areas, each call simulated here being drawn in as a marker in the corresponding RXQUAL-UL / FER-UL coordinates is.
  • no FH V frequency hopping
  • FH-4-Freq. XN frequencies
  • the markings (o) can be measured in the case “no FH X m of a cell Z without frequency hopping in the upward direction and stored on the RXQUAL-UL / FER-UL level.
  • One reported to the base station BS Downward reception quality RXQUAL-DL with the value 4 can then be mapped to a transmission frame extinction rate of between 2% and 5%, for example.
  • An algorithm for regulating or controlling the power control can then correspondingly increase the transmission power in the downward direction in order to achieve a desired transmission frame extinction rate FER-DL of, for example, 2% or a better value in the downward direction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé permettant de déterminer le taux d'erreurs de trames de transmission lors de la transmission de trames de transmission entre un poste mobile d'abonné et une station de base dans un système de communication. Dans le cas d'un poste d'abonné en train de communiquer, la qualité de réception de liaison descendante (RXQUAL-DL) est transmise à la station de base dans une liaison ascendante. En outre, la station de base peut déterminer la qualité de réception de la liaison ascendante (RXQUAL-UL) et la vitesse d'effacement des trames de transmission (FER-UL). Afin d'améliorer la commande du système de communication, il est prévu de mettre en relation la qualité de réception déterminée (RXQUAL-UL) et la vitesse d'effacement de trames de transmission déterminées (FER-UL) et de les consigner dans un tableau de référence. Un taux d'erreur de trames de transmission ou une vitesse d'effacement de trames de transmission (FER-DL) peut ainsi être évalué(e) dans le sens descendant, lorsque la qualité (RXQUAL-DL) est connue. Afin d'améliorer la commande du système de prendre en compte la vitesse d'effacement de trames de transmission dans le sens ascendant et dans le sens descendant (FER-UL et FER-DL), indépendamment de la manière dont le sens en question est déterminé, dans des algorithmes pour le réglage de la puissance et le transfert.
EP00981158A 1999-11-03 2000-11-03 Procede et systeme de communication pour evaluer la vitesse d'effacement d'un bloc de transmission de donnees a liaison descendante sur la base de mesures de liaison ascendante et de liaison descendante Withdrawn EP1228596A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE1999152951 DE19952951B4 (de) 1999-11-03 1999-11-03 Verfahren und Kommunikationssystem zum Abschätzen der Abwärtsverbindungs-Datenübertragungsblock-Auslöschungsrate aus Aufwärtsverbindungs- und Abwärtsverbindungs-Messungen
DE19952951 1999-11-03
PCT/DE2000/003865 WO2001033763A1 (fr) 1999-11-03 2000-11-03 Procede et systeme de communication pour evaluer la vitesse d'effacement d'un bloc de transmission de donnees a liaison descendante sur la base de mesures de liaison ascendante et de liaison descendante

Publications (1)

Publication Number Publication Date
EP1228596A1 true EP1228596A1 (fr) 2002-08-07

Family

ID=7927811

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00981158A Withdrawn EP1228596A1 (fr) 1999-11-03 2000-11-03 Procede et systeme de communication pour evaluer la vitesse d'effacement d'un bloc de transmission de donnees a liaison descendante sur la base de mesures de liaison ascendante et de liaison descendante

Country Status (4)

Country Link
EP (1) EP1228596A1 (fr)
CN (1) CN1387711A (fr)
DE (1) DE19952951B4 (fr)
WO (1) WO2001033763A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3173565B2 (ja) * 1996-06-20 2001-06-04 日本電気株式会社 Ｃｄｍａシステムにおけるアクセス規制装置
US5828672A (en) * 1997-04-30 1998-10-27 Telefonaktiebolaget Lm Ericsson (Publ) Estimation of radio channel bit error rate in a digital radio telecommunication network
US6157830A (en) * 1997-05-22 2000-12-05 Telefonaktiebolaget Lm Ericsson Speech quality measurement in mobile telecommunication networks based on radio link parameters
GB2344721B (en) * 1998-12-10 2003-05-14 Motorola Ltd Handover determination and power control adjustment in mobile communications systems with frequency hopping
US6097953A (en) * 1998-12-22 2000-08-01 Motorola, Inc. Method of performing handoff in a wireless communication system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0133763A1 *

Also Published As

Publication number Publication date
DE19952951B4 (de) 2007-04-19
DE19952951A1 (de) 2001-05-23
CN1387711A (zh) 2002-12-25
WO2001033763A1 (fr) 2001-05-10

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