WO2001008436A1 - Procede et systeme de mesure en cours de procedure d'etablissement des communications - Google Patents
Procede et systeme de mesure en cours de procedure d'etablissement des communications Download PDFInfo
- Publication number
- WO2001008436A1 WO2001008436A1 PCT/EP1999/005354 EP9905354W WO0108436A1 WO 2001008436 A1 WO2001008436 A1 WO 2001008436A1 EP 9905354 W EP9905354 W EP 9905354W WO 0108436 A1 WO0108436 A1 WO 0108436A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mobile station
- fill frame
- station
- communication system
- mobile communication
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
Definitions
- the present invention relates to a GSM (Global System for Mobile communication) mobile communication system and a method of operation thereof.
- the invention is applicable but not limited to determination of the position of mobile stations.
- GSM Mobile Communication
- GSM Mobile Communication
- the total coverage area of the system is divided into a number of separate cells each covered by a single base station.
- the cells are typically geographically distinct with an overlapping coverage area with neighbouring cells.
- the communication link will change from being between the mobile station and the base station of the first cell to being between the mobile station the base station of the second cell. This is known as a handover.
- some cells may lie completely within the coverage of other larger cells.
- All base stations are interconnected by a fixed network.
- This fixed network comprises communication lines, switches, interfaces to other communication networks and various controllers required for operating the fixed network.
- a call from a mobile station is routed through the fixed network to the destination specific for this call. If the call is between two mobile stations of the same communication system the call will be routed through the fixed network to the base station of the cell in which the other mobile station currently is. A connection is thus established between the two serving cells through the fixed network.
- PSTN Public Switched Telephone Network
- the call is routed from the serving base station to the interface between the cellular mobile communication system and the PSTN. It is then routed from the interface to the telephone by the PSTN.
- PSTN Public Switched Telephone Network
- GSM Global System for Mobile communications
- An example is the determination of the position of a mobile station.
- Techniques are known which by measuring the transmission delays between a mobile station and three or more fixed stations can determine the position of the mobile.
- An example is the triangulation technique used for example in the Global
- the transmission can either originate at the base stations or at the mobile stations.
- a position determination which can be implemented in the fixed infrastructure (i.e. base stations and fixed network) without requiring any modifications of a standard mobile station has the advantage if not requiring all current mobile stations to be replaced. This can be achieved by determining the position from measurements of the standard transmissions of the mobile station.
- the invention seeks to provide a GSM system with improved possibility of performing measurements on mobile station transmissions.
- a GSM mobile communication system comprising means for withholding a call assignment command during a call set-up causing a mobile station to transmit at one fill frame; at least one receiver station arranged to detect at least the one fill frame transmitted from the mobile station; and a processor for determining a characteristic of at least the one fill frame received by the receiver station.
- the characteristic is a time of arrival, a direction of arrival, a signal level, a signal to noise ratio, a bit error rate or a rate of fading.
- the detection of the at least one fill frame is by comparison to a local replica of a fill frame, preferably by correlation.
- a position of the mobile station is determined from the characteristic of at least the one fill frame.
- the call set-up is subsequently abandoned and the position of the mobile station can be reported to the mobile station by a data service such as the Short Message Service.
- a method of performing measurements in GSM mobile communication system comprising the steps of withholding a call assignment command during a call set-up causing a mobile station to transmit at least one fill frame; detecting at least one fill frame transmitted from the mobile station at least one receiver station; and determining a characteristic of at least the one fill frame received by the receiver station.
- the invention thus by withholding call assignment commands enables control of mobile transmissions with known data contents and approximate transmission times.
- FIG. 1 is an illustration of a GSM communication system according to the invention
- FIG. 2 is an illustration of a call set-up procedure for GSM according to prior art.
- FIG. 1 illustrates an example of a GSM communication system according to the invention.
- a mobile station 101 is located within a cell 103 served by a base station 105.
- Neighbouring cells 107,109 are served by other base stations 111,113.
- Receiving stations 115,117,119 are included to receive and measure characteristics of the transmissions from the mobile station. For example if the propagation delay of the paths 121,123 and 125 are measured it is possible to determine the position (or location) of the mobile station from the position of the receiving stations and these propagation delays as is well known in the art.
- the receiving stations will communicate the result of their measurements to a processor 126 where the position determination is performed.
- This processor 126 can be located at the receiver stations, the base stations, in the fixed network or distributed in the system.
- the position determination can be performed from receiver stations in the same cell or in different cells.
- the number and location of the receiver stations are so that the transmissions from mobile stations throughout the coverage area can be received simultaneously from as many receiver stations as is required for the specific algorithm.
- the receiver stations may be co-located with the base stations or the indeed the base stations themselves may perform the function of the receiver stations.
- a technique for performing measurements of mobile station transmissions during a call set-up procedure.
- GSM call set-up can be either mobile or initiated in the fixed network.
- the simplified protocol is shown in FIG. 2 which is according to prior art.
- the mobile station (MS) requests a channel and the base station (BTS) responds at T2 by assigning a temporary channel (SDCCH) on which to complete the call set-up.
- the mobile station confirms by using this channel at T3.
- the mobile station transmits a set-up message containing call information such as type of call and number being called. This message is confirmed by a call 'proceeding message' from the fixed network.
- the fixed network determines a suitable traffic channel and transmits this to the mobile station in the ' Assignment Command' message.
- the mobile station responds on the allocated traffic channel by sending an 'Assignment Complete' message and the call set-up completes as defined in the standards.
- a description of the call set-up routine in GSM can be found in M Mouly and M-B Pautet's The GSM System for Mobile Communications pub Cell & Sys, Palaiseau, France, ISBN2-9507190- 0-7.
- the call set-up procedure is followed as for standard GSM call set-up except that the assignment command is withheld and not transmitted to the mobile station.
- the mobile station will transmit fill frames when waiting for the assignment command.
- the content of these fill frames are known and the approximate transmission times are also known.
- the fixed network can furthermore control the number of retransmissions by transmitting an assignment command when a sufficient number of retransmissions have occurred.
- the receiving stations are directed to detect the fill frames being received, preferably by receiving around the expected time of arrival and comparing the receiving signal with the knowledge of what has been transmitted and a characteristic of the reception of the fill frame is generated.
- the fixed network Withholds the assignment command and communicates the approximate time of transmission and the contents of the fill frame to three receiving stations.
- the receiving stations compare the received signal with the expected signal in a time window around the expected time of arrival and determine the time of arrival from the time offset yielding the closest similarity.
- the receiving stations then communicate the determined time of arrival to a processor which determines the position of the mobile station from the times of arrival and the position of the receiving station by for example the triangulation technique well-known in the art. If the absolute time of transmission is not known, the relative time of arrival from three receiving stations allows a position determination in two dimensions and four receiving stations will allow position determination in three dimensions.
- the detection of fill frames is preferably by comparison where the received signal is compared to a local replica of the expected signal to be received when a fill frame is transmitted.
- the comparison can be performed as a correlation between the two signals. For a sampled signal a correlation over N samples is given by
- x n are the samples of the received signal and y n are the samples of the local replica.
- the detection of the fill frames and the determination of a characteristic of the fill frame received will preferably be performed simultaneously. For example, the correlation is repeated with small timing offsets within the time window where the fill frame is expected. A strong correlation for a given timing offset will indicate that the fill frame has been detected at this time. The correlation will thus simultaneously indicate that the fill frame has been detected and provide a determination of the time of arrival with a timing resolution equivalent to the steps of the timing offset. Also the magnitude of the correlation will be an indication of the signal strength of the received fill frame.
- the comparison and correlation allows the receiver station to separate the signal of the mobile station from unwanted noise and interference.
- the receiver station can perform the correlation over an entire time slot as all data of the fill frame are known.
- a correlation can thus only be extended over the midamble. This substantially increases the variance of the correlation due to noise and interference, and the transmission of fill frames thus allow significantly increased reliability and accuracy.
- the direction of arrival which can be determined using for example by using a antenna array and suitable algorithm such as the 'Beamforming Algorithm' which is well known in the art.
- a signal noise ratio which for example can be estimated between the ratio of the correlation and the total signal energy received
- a bit error rate which for example can be determined by demodulating the received signal and comparing the data to the known data of the fill frame.
- a rate of fading which for example can be determined from the rate of variation of the correlation.
- different parameters can be measured either at the same receiving station or at different receiving stations.
- the time of arrival and direction of arrival may be determined by one receiving station and the time of arrival by another receiving station and the position of the mobile station determined from these parameters.
- the call may be abandoned subsequent to the transmission of fill frames.
- the measurements can be performed without the requirement that a call setup is completed that the user or fixed network subsequently will terminate if the desire is not to make a call but only to generate a position estimate.
- the fixed network may thus instigate measurements of the mobile station to determine the position of or the radio conditions for the mobile station with alerting the user.
- the user may instigate measurements, for example to determine his current position, without needing to make a call.
- the fixed network can report the determined position back to the mobile station preferably by use of one of the data services defined in GSM such as the Short Message Service (SMS) or the General Packet Radio Service (GPRS) or the Unstructured Supplementary Service Data (USSD).
- SMS Short Message Service
- GPRS General Packet Radio Service
- USSD Unstructured Supplementary Service Data
- the invention thus provides the possibility of performing measurements of a number of characteristics of the transmissions from a mobile station as received by receiver stations.
- the measurements can be used for position determination or can provide extra information about the radio environment to the communication system.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
L'invention concerne un système de mesure pour système GSM, qui maintient la commande d'assignation durant l'établissement des communications, conduisant une station mobile (101) à émettre des séquences de remplissage, lesquelles sont détectées par des stations réceptrices (115, 117, 119). Les stations en question effectuent des mesures et déterminent une caractéristique. On peut ainsi évaluer la position de la station mobile d'après le moment de la réception des séquences de remplissage.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9812406A GB2338375A (en) | 1998-06-10 | 1998-06-10 | Determining characteristics of "fill frame" transmission received from a mobileparticularly for mobile location |
AU54140/99A AU5414099A (en) | 1999-07-21 | 1999-07-21 | Method and system for measuring during a call set-up procedure |
PCT/EP1999/005354 WO2001008436A1 (fr) | 1998-06-10 | 1999-07-21 | Procede et systeme de mesure en cours de procedure d'etablissement des communications |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9812406A GB2338375A (en) | 1998-06-10 | 1998-06-10 | Determining characteristics of "fill frame" transmission received from a mobileparticularly for mobile location |
PCT/EP1999/005354 WO2001008436A1 (fr) | 1998-06-10 | 1999-07-21 | Procede et systeme de mesure en cours de procedure d'etablissement des communications |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/715,674 Continuation US6350878B1 (en) | 1998-05-18 | 2000-11-17 | Intermediates for the synthesis of epothilones and methods for their preparation |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001008436A1 true WO2001008436A1 (fr) | 2001-02-01 |
Family
ID=26070377
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1999/005354 WO2001008436A1 (fr) | 1998-06-10 | 1999-07-21 | Procede et systeme de mesure en cours de procedure d'etablissement des communications |
Country Status (2)
Country | Link |
---|---|
GB (1) | GB2338375A (fr) |
WO (1) | WO2001008436A1 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2357397B (en) * | 1999-12-16 | 2003-10-15 | Motorola Ltd | Method and apparatus for enhancement of low-coverage areas in support of mobile station measurement techniques in a cellular telephone system |
GB2368240B (en) * | 2000-10-20 | 2002-08-28 | Motorola Inc | Method and apparatus for locating a mobile station within a radio communications system |
GB2406021A (en) * | 2003-09-12 | 2005-03-16 | Matsushita Electric Ind Co Ltd | Power efficient method for a mobile terminal to determine its location by processing only parts of the received signal |
EP3217739B1 (fr) * | 2016-03-09 | 2019-05-08 | Rohde & Schwarz GmbH & Co. KG | Procédés permettant d'activer et de localiser une station mobile sans interaction de l'utilisateur, appareil mobile, véhicule et système |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996025830A1 (fr) * | 1995-02-16 | 1996-08-22 | Europolitan Ab | Systeme de localisation |
WO1999027735A1 (fr) * | 1997-11-24 | 1999-06-03 | Telefonaktiebolaget Lm Ericsson (Publ) | Procede de determination de position de terminaux de communication mobiles |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2310098A (en) * | 1996-02-08 | 1997-08-13 | Philip Bernard Wesby | Locating mobile telephone |
EP0800319A1 (fr) * | 1996-04-02 | 1997-10-08 | Hewlett-Packard Company | Méthode de localisation pour systèmes radio-mobile |
GB2316823A (en) * | 1996-08-24 | 1998-03-04 | Motorola Ltd | Loxcating cellular radio transmitter |
US5945948A (en) * | 1996-09-03 | 1999-08-31 | Motorola, Inc. | Method and apparatus for location finding in a communication system |
-
1998
- 1998-06-10 GB GB9812406A patent/GB2338375A/en not_active Withdrawn
-
1999
- 1999-07-21 WO PCT/EP1999/005354 patent/WO2001008436A1/fr active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996025830A1 (fr) * | 1995-02-16 | 1996-08-22 | Europolitan Ab | Systeme de localisation |
WO1999027735A1 (fr) * | 1997-11-24 | 1999-06-03 | Telefonaktiebolaget Lm Ericsson (Publ) | Procede de determination de position de terminaux de communication mobiles |
Non-Patent Citations (1)
Title |
---|
VILLIER E ET AL: "Performance of a handset-assisted positioning method for GSM", 1999 IEEE 49TH VEHICULAR TECHNOLOGY CONFERENCE (CAT. NO.99CH36363), 1999 IEEE 49TH VEHICULAR TECHNOLOGY CONFERENCE. MOVING INTO A NEW MILLENIUM, HOUSTON, TX, USA, 16-20 MAY 1999, 20 May 1999 (1999-05-20), 1999, Piscataway, NJ, USA, IEEE, USA, pages 1967 - 1972 vol.3, XP002132448, ISBN: 0-7803-5565-2 * |
Also Published As
Publication number | Publication date |
---|---|
GB9812406D0 (en) | 1998-08-05 |
GB2338375A (en) | 1999-12-15 |
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