WO2001033763A1 - Verfahren und kommunikationssystem zum abschätzen der abwärtsverbindungs-datenübertragungsblock-auslöschungsrate aus aufwärtsverbindungs- und abwärtsverbindungs-messungen - Google Patents
Verfahren und kommunikationssystem zum abschätzen der abwärtsverbindungs-datenübertragungsblock-auslöschungsrate aus aufwärtsverbindungs- und abwärtsverbindungs-messungen Download PDFInfo
- Publication number
- WO2001033763A1 WO2001033763A1 PCT/DE2000/003865 DE0003865W WO0133763A1 WO 2001033763 A1 WO2001033763 A1 WO 2001033763A1 DE 0003865 W DE0003865 W DE 0003865W WO 0133763 A1 WO0133763 A1 WO 0133763A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- station
- fer
- transmission frame
- rxqual
- error rate
- Prior art date
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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.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00981158A EP1228596A1 (de) | 1999-11-03 | 2000-11-03 | Verfahren und kommunikationssystem zum abschätzen der abwärtsverbindungs-datenübertragungsblock-auslöschungsrate aus aufwärtsverbindungs- und abwärtsverbindungs-messungen |
Applications Claiming Priority (2)
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 |
DE19952951.5 | 1999-11-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001033763A1 true WO2001033763A1 (de) | 2001-05-10 |
Family
ID=7927811
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2000/003865 WO2001033763A1 (de) | 1999-11-03 | 2000-11-03 | Verfahren und kommunikationssystem zum abschätzen der abwärtsverbindungs-datenübertragungsblock-auslöschungsrate aus aufwärtsverbindungs- und abwärtsverbindungs-messungen |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1228596A1 (de) |
CN (1) | CN1387711A (de) |
DE (1) | DE19952951B4 (de) |
WO (1) | WO2001033763A1 (de) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0814624A2 (de) * | 1996-06-20 | 1997-12-29 | Nec Corporation | CDMA-Kommunikationssystem mit Zugangskontrollevorrichtungen entsprechend der Kommunikationsgüte |
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 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
-
1999
- 1999-11-03 DE DE1999152951 patent/DE19952951B4/de not_active Expired - Fee Related
-
2000
- 2000-11-03 WO PCT/DE2000/003865 patent/WO2001033763A1/de not_active Application Discontinuation
- 2000-11-03 EP EP00981158A patent/EP1228596A1/de not_active Withdrawn
- 2000-11-03 CN CN 00815381 patent/CN1387711A/zh active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0814624A2 (de) * | 1996-06-20 | 1997-12-29 | Nec Corporation | CDMA-Kommunikationssystem mit Zugangskontrollevorrichtungen entsprechend der Kommunikationsgüte |
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 |
Non-Patent Citations (2)
Title |
---|
LEI SONG; HOLTZMAN J M: "CDMA dynamic downlink power control", VTC '98. 48TH IEEE VEHICULAR TECHNOLOGY CONFERENCE. PATHWAY TO A GLOBAL WIRELESS REVOLUTION ,OTTAWA, ONT., CANADA,, vol. 2, 18 May 1998 (1998-05-18) - 21 May 1998 (1998-05-21), New York, NY, USA, IEEE, USA, pages 1101 - 1105, XP002163807 * |
WIGARD J ; MOGENSEN P: "A simple mapping from C/I to FER and BER for a GSM type of air interface.", PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS, 1996. PIMRC'96., SEVENTH EEE INTERNATIONAL SYMPOSIUM ON, vol. 1, pages 78 - 82, XP002163806 * |
Also Published As
Publication number | Publication date |
---|---|
CN1387711A (zh) | 2002-12-25 |
EP1228596A1 (de) | 2002-08-07 |
DE19952951A1 (de) | 2001-05-23 |
DE19952951B4 (de) | 2007-04-19 |
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