WO2000030397A1 - System and method for time of arrival positioning measurements based upon network characteristics - Google Patents
System and method for time of arrival positioning measurements based upon network characteristics Download PDFInfo
- Publication number
- WO2000030397A1 WO2000030397A1 PCT/US1999/027171 US9927171W WO0030397A1 WO 2000030397 A1 WO2000030397 A1 WO 2000030397A1 US 9927171 W US9927171 W US 9927171W WO 0030397 A1 WO0030397 A1 WO 0030397A1
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- WO
- WIPO (PCT)
- Prior art keywords
- mobile station
- ofthe
- telecommunications network
- mobile
- area
- Prior art date
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- 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, in general, to the mobile communications field and, particularly, to a system and method for enhanced time of arrival measurements for mobile station positioning utilizing geographical characteristics of the mobile communications network.
- TDOA position determination is an emerging field that has gained a great deal of interest lately, and it is now desirable to include a position determination capability in future cellular mobile radio systems.
- the Time Difference of Arrival (TDOA) position determination method which is known from military applications, has been used successfully for determining the position of mobile radio terminals.
- a typical TDOA position determination system can be either terminal based, whereby Time Of Arrival (TOA) measurements are made on the "downlink" in the mobile station (MS), or network based, whereby the network performs the TOA measurements on the "uplink” in the radio base transceiver stations (BTSs). These TOA measurements are then used to calculate TDOA parameters and estimate the position of the mobile station (MS).
- TOA Time Of Arrival
- BTSs radio base transceiver stations
- a network-based method for determining the position of cellular mobile stations is disclosed in commonly-assigned SwedishPatent Application No.9303561-3 toR. Bodin.
- a handover procedure is initiated between a serving base transceiver station and the new base transceiver station.
- the mobile station transmits access request signals to a new base transceiver station.
- the base transceiver station measures the time delay for the access request signal to travel between the mobile station and the base transceiver station. This procedure is repeated between the mobile station and one or more additional base transceiver stations.
- a service node in the cellular network calculates the position of the mobile station by utilizing information about the known positions of the base transceiver stations and the measured access time delays .
- This network-based method of determining the position of cellular mobile stations relies on so-called asynchronous handovers, where the target base transceiver stations measure the access delays to the mobile station. Each access delay is used as a measure of the distance between the mobile station and the respective base transceiver station.
- a number ofBSs may concurrently tune to the same transmitting MS in order to make time delay of arrival measurements between the MS and the B S s.
- the time delay of the signal transmitted by the mobile station during a handover procedure may be measured by the BSs for use by a processing unit to determine the position of the mobile station.
- the mobile station transmits signals during the handover operation as a series of bursts.
- Network resources in existing GSM systems may be overly utilized to determine mobile station position, thereby reducing the quality of other services provided by the telecommunications system.
- network resources may be under utilized, resulting in a less accurate mobile station position determination. Consequently, there exists a need for an improved TOA based, mobile station positioning system. It is an object of the present invention to provide a TOA based positioning system which efficiently and accurately determines the position of a mobile station in a mobile telecommunications network.
- Another obj ect of the present invention is to provide such a system wherein the method determining the location of the mobile station is based upon the location of time measuring units within the mobile telecommunications network.
- the present invention is directed to a system and method for efficiently determining the location of a mobile station within a mobile telecommunications network.
- the mobile telecommunications network includes at least one mobile switching center (MSC) to which a number of base station systems (BSSs) are communicatively associated to provide conventional wireless telecommunication services.
- MSC mobile switching center
- BSSs base station systems
- MSC mobile location center
- the system preferably maintains a geographical database of the service area of the telecommunications network.
- the database identifies portions of the service area having differing radio communication abilities, such as urban areas, suburban areas, and "badurban" areas in which radio communication is especially limited.
- the MLC preferably accesses the database in managing a mobile station positioning operation.
- Each base transceiver station (BTS) is assigned to and communicates with a location measurement unit (LMTJ), which performs radio measurements for supporting mobile station positioning.
- LMTJ location measurement unit
- an LMU is capable of measuring a time of arrival of access burst signals transmitted by the mobile station to be located.
- an application requests a location determination of a particular mobile station from the MLC .
- the MLC computes the number of access bursts necessary for transmission by the mobile station during an asynchronous handover operation.
- the MLC further computes the number of and identifies the particular LMUs for receiving the burst transmission by the mobile station.
- the identified LMUs measure the time delay of the burst transmission and transmit the measured time delays to the MLC .
- the MLC computes the location of the mobile cell and transmits the location computation to the requesting application. Because the calculation of the required burst number and the identification of the participating LMUs for measuring the burst transmission delay is based upon the geographical characteristics of the telecommunications network, network resources are not over-used, resulting in less resources for performing other telecommunication services.
- Network resources are also not under-utilized, resulting in a less accurate determination of the mobile station than requested.
- Figure 1 is a block diagram of a mobile telecommunications system according to the present invention
- Figures 2 is an event chronology of a mobile station positioning operation in conjunction with the present invention
- Figure 3 is an event chronology of the TOA-based positioning procedure for executing a mobile station positioning operation in conjunction with the present invention.
- Telecommunications network 1 preferably includes one or more mobile switching centers (MSC) 2 which provides call set-up, routing, control and termination operations in providing telecommunication services to one or more mobile stations 3.
- MSC mobile switching centers
- the communicative relationship between a base station 4, and particularly base station controller 12, and its corresponding MSC 2 in providing conventional telecommunication services is well known in the art.
- the MSC 2 may be utilized by a visiting mobile station (MS) 3 as a visiting mobile switching center (VMSC) for receiving telecommunication services.
- MS visiting mobile station
- VMSC visiting mobile switching center
- telecommunications network 1 may include a plurality ofMSCs 2, each of which communicates with a plurality of base stations 4.
- Telecommunications network 1 is illustrated in Figure 1 as having a single MSC 2 for reasons of simplicity.
- Telecommunications network 1 preferably further includes a distinct mobile location center (MLC) 5 associated with each MSC 2 in telecommunication network 1.
- MLC mobile location center
- An MLC 5 in telecommunications network 1 may serve as a gateway mobile location center (GMLC) 6 which an external location area (LA) 7 may access in requesting a dete ⁇ riination of a mobile station position.
- An MLC 5 serving mobile station 3 is referred to as the serving mobile location center (SMLC).
- the present telecommunications network 1 preferably further includes a location measurement unit (LMU) 8, a distinct one of which is associated with each base transceiver station (BTS) 9.
- An LMU 8 preferably communicates with its corresponding base station 4 via the air interface so as to be capable of communicating with MSC 2 and MLC 5.
- An LMU 8 preferably has its own subscription profile in home location register (HLR) 10 associated with MSC 2. Each LMU 8 performs timing-related, radio signal measurements to support the mobile station position determination feature. The timing-related signal measurements are preferably provided to the particular MLC 5 associated therewith for facilitating MLC 5 in managing the execution of a mobile station position determination, as explained below.
- HLR home location register
- Telecommunications network 1 includes and MLC 5 preferably accesses a database 11 having stored therein geographical information pertaining to network 1.
- database 11 preferably includes knowledge of the surroundings of the cell areas (not shown) served by MSC 5. Based in part upon the cell global identification (CGI) of the served cells, database 11 includes graphical information thereof, such as an indication whether each served cell is an urban cell, a suburban cell or a badurban cell having poor radio communication capabilities.
- Database 11 preferably further includes the identification and geographical location and/or distribution of each LMU 8 corresponding to the cells served by MSC 2.
- Database 11 is preferably accessed by a serving MLC 5 in making decisions and/or calculations regarding the determining of the position of a mobile station
- an SMLC 5 performs a number of activities in managing the execution of a mobile station positioning operation.
- SMLC 5 Upon receiving a request to locate a mobile station 3 having a certain degree of accuracy and/or quality of service, SMLC 5 preferably calculates the number of required access bursts for transmission by mobile station 3 during a handover portion of a TOA-based mobile station positioning operation.
- SMLC 5 identifies the particular LMUs 8 which are to participate in the mobile station positioning operation. Both the calculation of the required access bursts and the identification of participating LMUs 8 are based upon the cell/service area geographical information stored in database 11 in order to efficiently utilize network resources.
- the calculation of the number of required access bursts and the identification of participating LMUs 8 vary depending upon the type of cell/service area the mobile station 3 is located.
- the number of access bursts required by transmission of a mobile station 3 is typically between 1 and 70.
- a smaller number ofaccess bursts is necessary to perform a mobile station positioning determination if a mobile station 3 is located within an urban cell area relative to the number ofaccess bursts necessary if the mobile station 3 is located within a badurban cell area.
- the greater the degree of positioning accuracy requested increases the number of required access bursts as well as the number of participating LMUs 8.
- an application requests a mobile station position determination from a GMLC 6.
- GMLC 6 responds to the request by verifying the identity of the application and that the application is a subscriber to the mobile station position service.
- IMSI international mobile subscriber identity
- GMLC 6 sends a request for routing information to the HLR 10 serving mobile station 3 at step 21.
- HLR 10 returns the address of the serving MSC 2 and the IMSI for mobile station 3 at step 22.
- GMLC 6 Upon receiving the address of the serving MSC 2, GMLC 6 sends a message to the serving MSC 2 at step 23 which informs MSC 2 of the position request.
- the message includes service related parameters specified by the requesting application, including accuracy, response time, preferred/required positioning method and an indication whether the application has an override capability.
- the serving MSC 2 may verify that mobile station 3 does not bar a position determining service thereon by MSC 2 accessing the subscriber's profile.
- the mobile station positioning deteirnination continues by the serving MSC 2 and/or corresponding VLR (not shown) performing paging, authentication and ciphering to mobile station 3 if mobile station 3 is idle (step 24). In response thereto, mobile station 3 provides its current cell identification and timing advance (TA) value.
- TA timing advance
- the serving MSC 2 is supplied with the current cell identification from eitherBSC 12 or another MSC 2 in the event anMSC- MSC handover is in progress (step 25).
- the serving MSC 2 then sends a request message to perform a location determination to the serving MLC 5 associated with the current cell of mobile station 3 (step
- the request may include the service related parameters (accuracy, etc.) specified by the requesting application as well as the current cell identification and TA value of mobile station 3.
- the serving MLC 5 upon receiving the request message to perform the position determination for mobile station 3 , retrieves from database 11 geographical information pertaining to the general area in which mobile station 3 is located (step 27). Thereafter, the serving MLC 5 calculates the number of access burst transmissions required by mobile station 3 , and calculates a timer value for base station(s) 4 (step 28). The servingMLC 5 additionally determines the TDMAframe number. The serving MLC 5 performs the calculations and determinations based upon the cell/service area geographical characteristics retrieved from database 11 and upon the information received by the serving MSC 2 in step 26.
- the serving MLC 5 transmits a channel information message to the serving MSC 2 (and any other MSC 2 which is necessary to perform the position determination) at step 30 having therein the required number ofburst signals, the determined TDMA frame number, the base station timer value and an indication that TOA positioning will be utilized.
- a traffic channel is set up in the event mobile station 3 is idle (step 31).
- MSC 2 transmits a channel information message to the appropriate BSC(s)
- the channel information message may al so contain the determined TDMA frame number, the number of expected mobile station access bursts and the calculated base station timer value.
- the B SCs 12 initiate a base station timer (not shown) at this time.
- theBSCs l2 specify the physical channel description, the CGI, and TA measurement result, and transmits an acknowledgment message to MSC 2 at step 33.
- MSC 2 transmits a channel information acknowledgment message to the serving MLC 5 having therein the physical channel description (step 34).
- the serving MLC 5 uses the physical channel information in configuring LMUs 8.
- the serving MLC 5 retrieves geographical information from database 11 (step 34A) and identifies the LMUs 8 for participating in the mobile station position determination (step 34B) based upon the geographical information retrieved from database 11 (radio environment information and LMU distribution information). MLC 5 then transmits a measurement configuration messages for each ofthe identified LMUs 8 to MSC
- the configuration message specifies the physical channel, LMU identification, TDMA frame number for the handover operation portion ofthe position determining service, the number of expected access bursts by mobile station 3 , and the starting time and measurement window for the expected access bursts.
- MSC 2 converts the configuration message from the serving MLC 5 into a DTAP message for reception by the identified LMUs 8 over the air interface (step 36).
- base station controller 12 ofbase station 4 Upon expiration ofthe base station timer, base station controller 12 ofbase station 4 forwards the correspondingBTSs 9 a positioning preparation message having the number of expected access bursts from mobile station 3 during execution of a handover operation (step 37).
- the BTS s 9 respond by transmitting a positioning preparation acknowledgment signal to their respective BSCs 12 (step 38).
- base station controller 12 sends a handover command to mobile station 3 at step 39.
- the command includes the TDMA frame number at which the transmission ofaccess bursts should begin.
- Mobile station 3 commences transmitting access bursts in a handover access message at step 40.
- the BTSs 9 corresponding thereto sends a physical information message to mobile station 3 at step 41 requesting mobile station 3 discontinue frarismitting burst signals. It is noted that in the event mobile station 3 fails to receive a request to discontinue the burst transmission, a timeout condition occurs which discontinues the transmission.
- the BTSs 9 transmit a handover detection message to their respective BSCs 12 to indicate that the required number ofaccess bursts have been received on the allocated channel (step 42).
- Mobile station3 sends a handover complete message to BSC(s) 12. This triggers base station(s) 4 to switch paths from the old channel to the new channel. However, it is noted that in the mobile station positioning determination feature, the old channel is the same as the new channel when executing the handover command thereof.
- LMUs 8 report their timing measurement results in a DTAP message to MSC
- step 43 which is thereupon routed to the serving MLC 5 as a MAP message (step 44).
- the serving MLC 5 computes a position for mobile station 3 based upon the reported measurement results.
- the serving MLC 5 computes the position for mobile station 3 .
- the serving MLC 5 transmits a MAP perform location acknowledge signal to MSC 2 (step 29).
- MSC 2 forwards the position information to the GMLC 6, whereupon the position information is forwarded to the requesting application.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU17294/00A AU1729400A (en) | 1998-11-17 | 1999-11-16 | System and method for time of arrival positioning measurements based upon network characteristics |
CA2350518A CA2350518C (en) | 1998-11-17 | 1999-11-16 | System and method for time of arrival positioning measurements based upon network characteristics |
BR9915428-5A BR9915428A (en) | 1998-11-17 | 1999-11-16 | Process and device for determining a position of a mobile station within a mobile telecommunications network, and, mobile telecommunications network. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/193,309 US6198935B1 (en) | 1998-11-17 | 1998-11-17 | System and method for time of arrival positioning measurements based upon network characteristics |
US09/193,309 | 1998-11-17 |
Publications (1)
Publication Number | Publication Date |
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WO2000030397A1 true WO2000030397A1 (en) | 2000-05-25 |
Family
ID=22713095
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1999/027171 WO2000030397A1 (en) | 1998-11-17 | 1999-11-16 | System and method for time of arrival positioning measurements based upon network characteristics |
Country Status (5)
Country | Link |
---|---|
US (1) | US6198935B1 (en) |
AU (1) | AU1729400A (en) |
BR (1) | BR9915428A (en) |
CA (1) | CA2350518C (en) |
WO (1) | WO2000030397A1 (en) |
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WO2001005185A1 (en) * | 1999-07-08 | 2001-01-18 | Ericsson Inc. | Time of arrival based positioning during handover |
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WO2001010163A1 (en) * | 1999-08-03 | 2001-02-08 | Ericsson, Inc. | Architecture for time of arrival positioning with location management units control functionality in base station controller |
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KR100834616B1 (en) * | 2002-02-27 | 2008-06-02 | 삼성전자주식회사 | Method for determining ms location without gps in mobile communication system |
KR100469416B1 (en) * | 2002-03-27 | 2005-02-02 | 엘지전자 주식회사 | Location tracing apparatus and method for mobile terminal |
Also Published As
Publication number | Publication date |
---|---|
AU1729400A (en) | 2000-06-05 |
US6198935B1 (en) | 2001-03-06 |
CA2350518C (en) | 2011-01-11 |
CA2350518A1 (en) | 2000-05-25 |
BR9915428A (en) | 2001-08-07 |
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