KR20040068605A - Creating and using base station almanac information in a wireless communication system having a position location capability - Google Patents

Abstract

In a wireless mobile communication system with location services, base station information is stored in base station satellite power. In addition to the location of the base station antennas, forward link delay corrections, and base station identification information, the base station satellite force record includes the center location of the base station sector coverage area, the maximum range of the base station antenna, the average height of the terrain relative to the sector coverage area, and the sector coverage area. Standard Deviation of Terrain Height, Round-Trip Delay (RTD) Correction Information, Repeater Information, Pseudo-Random Noise (PN) Increment, Uncertainty of Base Station Antenna Position, Uncertainty of Forward Link Delay Correction, and Round-Trip Delay Correction Includes the uncertainty of

Description

CREATING AND USING BASE STATION ALMANAC INFORMATION IN A WIRELESS COMMUNICATION SYSTEM HAVING A POSITION LOCATION CAPABILITY}

Related Applications

This application claims the priority of US Provisional Application No. 60 / 343,748, filed Dec. 27, 2001 and referenced herein. This application also claims the priority of US application Ser. No. 10 / 093,751, filed March 7, 2002.

Background of the Invention

Technical Field of the Invention

TECHNICAL FIELD The present invention generally relates to mobile communications, and more particularly, to a wireless communication system having the ability to determine the location of a mobile station. More particularly, the present invention relates to the generation and use of information stored in base station almanac in such a wireless communication system.

Description of the related technology

Mobile communication networks are providing increasingly complex capabilities to measure the location of mobile terminals in the network. When a mobile terminal calls an emergency service, such as a 911 call in the United States, the regulatory requirements of the jurisdiction may require the network to report the location of the mobile terminal. In code division multiple access (CDMA) digital cellular networks, the position measurement capability may be provided by Advanced Forward Link Trilateration (AFLT), a technique for calculating the position of a mobile station (MS) from the mobile station's measured arrival time for a base station radio signal. Can be. A more advanced technique is hybrid positioning, in which a mobile station uses a Global Positioning System (GPS) receiver and calculates its position based on AFLT and GPS measurements.

Applicable in both MS-based and MS-supported cases, the message protocol and format for CDMA positioning measurements employing AFLT, GPS, and hybrid receivers is TIA / EIA standard IS-801-1 2001, dual-mode spread spectrum It is published in the Location Services Standards for Systems-Appendix, see here.

Another location measurement technique is that measured by the network entity, not the mobile station. One example of these network-based methods is round-trip delay (RTD) measurement performed by a base station receiving a signal from a mobile station. Measurements by the mobile station may be combined with network-based measurements to improve the accuracy and availability of the calculated location.

In wireless communication systems with location services, it is common to store calibration information and other base station information in a database. Such a database is known as base station satellite power. A typical base station satellite power record specifies base station identification information, the location of the base station antennas, and sometimes forward link delay corrections. For example, TIA / EIA Standard IS-801-1 2001, page 4-37 specifies the base station satellite power with the following fields in each base station record: REN_PN, TIME_CORRECTION_REF, LAT_REF, LONG_REF, HEIGHT_REF. These fields include the pilot PN sequence offset of the reference base station, the base station time correction (alternatively, forward link delay correction), and the latitude, longitude, and altitude of the base station antenna. An proposal in which this base station record further includes a field for the sector width of the base station antenna and a field for the horizontal direction of the base station antenna was proposed in subcommittee TR45.5 of the TIA.

Summary of the Invention

In addition to the base station parameters described above, there are a number of other base station parameters, which are important for calculating the position of mobile stations in a wireless communication network. These additional parameters include the center location of the base station sector coverage area, the maximum range of the base station antenna, the average height of the terrain for the sector coverage area, the standard deviation of the terrain height for the sector coverage area, the round-trip delay (RTD) calibration information, the repeater Information, pseudo-random noise (PN) increments, uncertainty in base station antenna position, uncertainty in forward link delay correction, and uncertainty in round-trip delay correction.

In a preferred implementation, sector center position data is used as an initial position to support positioning using a global satellite system, and as the mobile station's default position in a cell sector when the position of the mobile station cannot be determined more accurately. I use it. The maximum antenna range is used to measure the sector coverage area of the base station in order to associate the observed terrestrial signal with the entry for the base station within the base station satellite power. The average height of the terrain is used to obtain the position fix of the mobile station, and the standard deviation of the terrain height with respect to the cell sector coverage area is used to determine the degree of weighting the average height information of the terrain to determine the position fix. Round-trip delay (RTD) calibration information is used to improve the accuracy of the reverse link range measurements used to determine the mobile station location. Repeater information is used to determine how to use AFLT range measurements. Pseudo-random noise (PN) increments are used to determine the number of pseudo-random noise (PN) offsets of base stations that are remote from each other. The uncertainty in the accuracy of the base station antenna position is used to determine the weight to apply to measurements from the base station. The uncertainty in the accuracy of the forward link delay correction for the base station is used to determine the weights to apply to the forward link delay and RTD measurements. The uncertainty in the accuracy of the round-trip delay correction for the base station is used to determine the weight to apply to the RTD (reverse link) measurements.

Brief description of the drawings

Other objects and advantages of the present invention will be apparent from the following detailed description when read in conjunction with the accompanying drawings.

1 illustrates a cellular telephone network using a wireless base station and a GPS system to measure the location of a mobile telephone unit.

2 is a block diagram of a base station in the cellular telephone network of FIG.

3 is a block diagram of a fixed component of the cellular telephone network of FIG. 1, including a location determination entity that accesses a base station satellite power database within base station satellite power.

4 is a table of measured and optional parameters in a base station record within the base station satellite power of FIG. 3.

FIG. 5 is a table of derived parameters in base station records within base station satellite power of FIG. 3. FIG.

6 is a diagram illustrating a relationship between various parameters associated with a base station antenna.

7 is a cell coverage map including a plurality of cell sectors.

8 and 9 are flowcharts illustrating how a positioning entity determines the location of a mobile station.

10 is a flowchart of a procedure used by a wireless network system to generate base station satellite power.

11 is a block diagram of a particular configuration for a base station satellite power database server.

12 is a block diagram of a redundant configuration of a location determination entity and a base station satellite power database server.

13 shows various field groups in base station satellite power.

14 illustrates a description of cell sector identity information in a base station satellite power database and a related problem detection method used by the base station satellite power database server.

15 illustrates a description of antenna position information in a base station satellite power database, and a related problem detection method used by the base station satellite power database server.

16 illustrates a description of cell sector center information in a base station satellite power database and a related problem detection method used by the base station satellite power database server.

17 illustrates the description of antenna direction, antenna aperture, and maximum antenna range information in the base station satellite power database, and the associated problem detection method used by the base station satellite power database server.

18 illustrates a description of average height information of a terrain in a base station satellite force database, and a related problem detection method used by the base station satellite force database server.

19 illustrates a description of round-trip delay (RTD) correction and forward link correction information in a base station satellite power database, and a related problem detection method used by the base station satellite power database server.

20 illustrates a description of potential repeater and PN incremental information in a base station satellite power database, and a related problem detection method used by the base station satellite power database server.

21 illustrates a description of the uncertainty parameters in the base station satellite force database, and a related problem detection method used by the base station satellite force database server.

22 shows a list of problem detection methods using estimates of cellular handset position.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof have been shown by way of example in the drawings and will be described in detail. However, it is not intended to limit the form of the invention to the specific forms shown, whereas the invention includes all modifications, equivalents, and substitutions within the scope of the invention as defined by the appended claims. Should be understood.

Detailed description of the invention

1 illustrates a CDMA cellular telephone network using a GPS system for measuring the position of a mobile telephone unit and calibrating a base station. Although the present invention is described with reference to these examples, it should be understood that the present invention is not limited to the use of CDMA or GPS. For example, the present invention may be implemented in a time division multiple access (TDMA) cellular telephone network without using any kind of global satellite system that supports location measurement.

In general, in order to practice the present invention with any kind of wireless communication network, such as a TDMA cellular telephone network, it is desirable to consult applicable industry standards for standards regarding compatible positioning services. For example, the following detailed description refers to the TIA / EIA standard IS-801-1 2001, Positioning Service Standard for Dual-Mode Spread Spectrum Systems, which is particularly suitable for CDMA networks using AFLT and GPS. The TIA / EIA standard ANSI-136 (system-assisted mobile station positioning via satellite) is suitable for TDMA digital PCS systems in the United States. The third generation partnership project standards 3GPP TS 04.31 and TS 25.331 positioning services (LCS; UE location using OTDOA) are suitable for certain European GSM wireless telephone networks.

FIG. 1 shows five CDMA base stations 11, 12, 13, 14, 15 arranged in a fixed position in a hexagonal array on the earth 16 surface. At about 11,000 nautical miles on Earth, there are typically at least five GPS satellites 17, 18, 19, 20, 21 in line-of-sight communication with base stations 11-15. Within the communication range of the base station, there are a number of mobile CDMA telephone units 22, 23, referred to as mobile stations (MS) in the TIA standard document described above. These mobile stations MS include an AFLT dedicated mobile station such as AFLT mobile station 22, a hybrid mobile station such as hybrid mobile station 23, and a GPS mobile station 9.

The CDMA network can measure the position of the AFLT mobile station 22, the hybrid mobile station 23, and the GPS mobile station 9 from the base station using the so-called well-known AFLT technique of the mobile station, which measures the arrival time of the pilot radio signal. Can be. The arrival time is indicated by the pilot phase measurement associated with the time base of the mobile station. To remove the effect of the time offset on the mobile station's time base, calculate the difference between the pair of adjacent base stations and the pilot phase measurement. In most cases, each difference places the mobile station in a particular hyperbola. The intersection of the hyperbola gives the location of the mobile station.

The CDMA network may also measure the position of the hybrid mobile station 23 using well known GPS techniques. Each CDMA base station 11-15 has a GPS receiver that receives a carrier and pseudo random code sequence of one or more GPS satellites 17-21 to provide a CDMA system time base with reference to the GPS system time base. When the hybrid mobile station joins a location measurement session with the CDMA network, the serving base station may transmit GPS acquisition data to the hybrid mobile station. Hybrid mobile station 23 may use the GPS acquisition data to obtain a measurement of pseudorange between each GPS satellite 17 to 21 and the mobile station, typically within about 10 seconds. For MS-assisted solutions, hybrid mobile station 23 transmits pseudorange measurements to the serving base station. As will be described further below with reference to FIG. 3, a position determining entity (PDE) may calculate the geographical position of the hybrid mobile station 23 from four or more pseudorange measurements. Alternatively, for MS-based solutions, the geographical location of the mobile station may be calculated by the mobile station itself.

FIG. 2 shows a functional block diagram for each base station in the cellular telephone network of FIG. 1. Base station 11 has a GPS receiver 31 which provides a base station time base 32 with reference to the GPS system time. The GPS receiver 31 obtains a signal from the GPS antenna 39. The base station also includes a CDMA transceiver 33 for communicating with mobile stations in the CDMA network. CDMA transceiver 33 obtains CDMA system time from base station time base 32. The CDMA transceiver 33 transmits and receives a radio signal via the CDMA antenna 40.

3 is a block diagram of a fixed component of the cellular telephone network of FIG. A mobile station switching center (MSC) 34 interfaces voice data and communication data between a plurality of telephone lines 35 and base stations 11, such as copper wires or optical fibers. A mobile station positioning center (MPC) 36 is connected to a mobile station switching center (MSC) 34. The MPC 36 manages the location measurement application and interfaces the location data with an external data network via an interworking function (IWF) 37 and a data network link 38. Positioning entity (PDE) 41 collects and formats positioning data. PDE 41 may provide wireless support to mobile stations and perform position calculations. PDE 41 is connected to MPC 36 and MSC 34. PDE 41 accesses base station satellite force database 44 managed by base station satellite force database server 43. [Update drawing is based on word change and one level of detail removal]. PDE 41 and base station satellite power database server 43 are implemented using, for example, a conventional digital computer or workstation. As will be described further below, base station satellite power 44 is stored in the hard disk of a computer for the base station satellite power database server 43.

The base station time base (32 in FIG. 2) should be calibrated when the base station is installed or changed. Each base station is from a GPS antenna (39 in FIG. 2) to a GPS receiver (31 in FIG. 2), from a GPS receiver to a CDMA transceiver (33 in FIG. 2), and from a CDMA transceiver to a CDMA antenna (FIG. Due to a change in propagation delay or phase shift up to 2 intent symbol 40, it may have a respective time offset between the transmission of the CDMA signal and the GPS system time. Thus, in order to reduce the ranging error in AFLT positioning and the ranging error and timing error in hybrid positioning, for example, the base station satellite force to be used by PDE (reference numeral 41 in FIG. 3). By storing the time offset for the base station in the database (reference 44 in FIG. 3), all base stations should be calibrated after completing the base station installation. It is also desirable to re-calibrate the base station and update the database for any subsequent hardware changes.

To calibrate or re-calibrate a base station, a call is typically made when hybrid mobile station users participate in a telephone call, or when field service personnel drive near a selected location to obtain location data that is not obtained from a typical location session. If so, GPS and AFLT positioning data are obtained from the hybrid mobile station during the normal positioning session. In this way, the PDE (41 in FIG. 3) may calculate the calibration data internally, and may continuously store the calibration data in the base station satellite force database (44 in FIG. 3). In addition, to alleviate some private concerns, a typical location session may occur only when an operator of a hybrid mobile station makes or responds to a wireless telephone call. In this case, the CDMA system does not determine the location of the operator without the operator's knowledge and consent.

In a preferred form of configuration, base station satellite power (44 in FIG. 3) includes a record for each base station sector and frequency, each record including measured parameters, optional parameters, and derived parameters. . The measured and optional parameters are shown in the table of FIG. 4, and the derived parameters are shown in the table of FIG. 5.

Referring to FIG. 4, the pilot sector is an optional parameter with a value provided by the wireless operator or system integrator. The value should be a null or English-readable and English-understandable name that is assigned for more efficient data logging and debugging.

The system ID corresponds to the SID parameter returned in the MS-provided pilot phase measurement message defined in the Positioning Service Standard for Dual-Mode Spread Spectrum Systems (page 3-38), which is an IS-801 specification.

Network IDs are available through the Wireless Operators Cellular Network Planning Specification. The value corresponds to the NID parameter returned in the MS-provided pilot phase measurement message as defined in the IS-801 standard Positioning Service Standard for Dual-Mode Spread Spectrum Systems (page 3-38).

The extended base ID is available through the wireless operator cellular network planning standard. The value is determined by the following parameters returned in the MS-provided pilot phase measurement message defined in the IS-801 specification for Positioning Service Standards for Dual-Mode Spread Spectrum Systems (page 3-38): BAND_CLASS, CDMA_FREQUENCY, and Corresponds to BASE_ID. These values are further defined and described in the IS-95 / IS-95-B standard, TIA / EIA IS-95 / IS-95-B.

The transmitting PN is available through the wireless operator cellular network planning standard. In addition, the value is further defined and described in the IS-95 / IS-95-B standard TIA / EIA IS-95 / IS-95-B.

Base station antenna position information (latitude, longitude, and altitude) is preferably a "survey grade" in WGS-84 with an error within 1 meter. Antenna position information is important for performance results that relate purely to the use of AFLT measurements for initial and final position determination in AFLT mode or hybrid mode. For example, the MS provides pilot phase measurement data to the PDE. The PDE establishes an initial approximate location using values provided for or derived from the antenna location information. The presence of many errors in this data may contribute to sub-optimal performance. While calculating the final position, the PDE uses the pilot phase measurement data alone (AFLT mode) or in combination with GPS data (hybrid mode). In all cases, antenna position and height (altitude) should be provided to ensure the best accuracy.

For three-dimensional position, the antenna position accuracy is analyzed with 97.1% confidence (3-sigma).

As further shown in FIG. 6, the antenna direction represents the direction in which the base station antenna is pointed with respect to the north. The value is available through the wireless operator cellular network planning database. Alternatively, the value is determined empirically while visiting the place.

As further shown in FIG. 6, the antenna opening is associated with the antenna RF footprint at each angular opening. The value is available through the wireless operator cellular network planning database.

The maximum antenna range is the range within which the MS is within this distance from the BS antenna position for the 99% MS session time provided by this BS. For good system performance, this value is the minimum range needed to cover 99% MS session time. Antenna pattern and BS transmitter power are taken into account when modeling these parameters. Use reasonable assumptions about signal obstructions. The model also takes into account the possibility that the call will be provided by other nearby base stations. It may be difficult to take appropriate field data to accurately determine these parameters, so take a method of using information with a degree of uncertainty appropriate to the PDE.

The average height of the terrain and the standard deviation of the height are obtained from a high quality digital terrain height mapping database that is accessed once offline to occupy these fields. As described in detail below with reference to FIG. 7, terrain height (or altitude) statistics are determined for the terrain provided by a given sector.

The RTD calibration value has a value determined by field empirical measurements. If RTD is not supported by the operator infrastructure, RTD parameters are optional. If RTD is supported, RTD calibration accuracy is estimated as a confidence value (3-sigma) of 99.7%.

The FWD link calibration value is determined by field empirical measurements. FWD calibration accuracy is estimated as a function of the FWD link calibration procedure and interpreted as a confidence value (3-sigma) of 99.7%.

If the transmitter described by the satellite power entry is not a repeater, use the potential repeater parameters to indicate the potential presence of the repeater. The potential repeater parameter is set to zero if the transmitter is not used with a repeater and set to 1 if the transmitter is used with one or more repeaters to convey its transmitter signal.

If the transmitter described by this satellite power entry is a repeater, the potential repeater parameter is set to a value (greater than 1) that represents the unique repeater ID. If there is one or more repeaters associated with a given sector, and some repeater information is provided to that BS, there is a unique base station satellite power for all repeaters, and the potential repeater field is used as a counter. That is, the first repeater has a potential repeater value of 2 and the second repeater has a potential repeater value of 3. (Potential repeater value 1 is reserved for BS information, indicating that repeaters exist for the BS.)

The PN increment parameter has a value representing the most common factor of the same CDMA frequency and all other offsets present near that frequency and the PN offset of this sector. Many networks use fixed increments such as 2, 3, or 4. Near the boundary of two networks, it is very important that the most common factor of network-designed PN increments may be used for all BS satellite power in the vicinity, as it may be able to listen to BSs from neighboring networks. In networks where increments may be less than 3, these parameters should be fairly accurate based on the network model. This information is used by the PDE to resolve potential ambiguities between different pilots in the same neighborhood. If this is set too small (eg set to 1 if true is 2), the PDE may need to "throw out" the available measurements. If it is set too large, the PDE may report the wrong location.

The format type parameter has a value indicating that the format shown in FIGS. 4 and 5 is used for satellite power entry, and other values may be used to indicate that other formats are used.

The MSC switch number is an optional parameter. The value is available through the wireless operator cellular network planning database. The value must correspond to the MSC switch number parameter sent to the PDE in the switch number portion of the MSCID field as defined in the various J-STD-036 messages, in particular the GPOSREQ message. (See Extended Wireless 01-1 Phase 2 J-STD-036 Standard and ANSI-41-D Standard Inside). In some implementations where the use of J-STD-036 is not required to communicate with the PDE, the MSC switch number is not needed. If no MSC switch number is required, the value should be set to -1.

Referring to FIG. 5, the sector center latitude, longitude, and altitude are calculated using the following measured parameters: antenna latitude, antenna longitude, antenna altitude, antenna direction, antenna aperture, and maximum antenna range. These measured antenna parameters are shown in FIG. 6, where axes 51 and 52 correspond to antenna latitude and antenna longitude, respectively. Sector center is used to calculate the GPS acquisition support value when the initial approximate position cannot be determined using pilot phase measurements. The information is important to minimize the potential GPS search space. Sector-centric information may also be used as a starting point for an iterative navigation solution.

The sector center is preferably the average position of mobile stations in the base station sector antenna coverage area. In this case, initially, the sector center can be set to an estimate based on the directivity of the antenna, which can be improved for each determination of the location of the mobile station in communication with the base station. For example, for omni-directional antennas, initially, the sector center is set to the latitude and longitude of the base station antenna, and the terrain height of the base station antenna, or the average height of the terrain. For a directional antenna with a narrow beam width, initially, the sector center is set to the latitude and longitude at about 30% of the maximum antenna range from the antenna, and the terrain height of the base station, or the average height of the terrain. Whenever the position of the mobile station is determined within a sector, the new value of sector center is, for example,

Is computed as the weighted average of the location and previous value of the mobile station, where [i] is an index with a value representing the location coordinates of latitude, longitude, or altitude, where α is 1 / (MIN + NMP) and The same weighting factor, MIN, is a predetermined number, such as 100, representing the weight of the initial estimate, and NMP is the mobile station positioning number performed in the cell sector.

The mean height of the sector terrain and the standard deviation of the terrain height (uncertain estimate) parameter have values derived from an accurate terrain height map or other direct and empirical method. These values are used by the PDE as height support information. The information corresponds to additional degrees of freedom available for final positioning calculations. Accurate height support information is important as additional GPS satellite or pilot phase measurements to improve yield and accuracy.

To calculate a GPS range, an AFLT range, or a position fix that may be generated from the earth's surface, a sum of four measurements is required. In accurate detection of the altitude of a given area, the earth's surface can be used as an additional measure in navigation solutions. This means that smaller GPS or AFLT range measurements are required and can significantly improve yield in difficult environments. Since the sum of four measurements is required, if altitude was used, only three measurements yield one fix.

The standard deviation parameter of the terrain height defines the 1-sigma uncertainty associated with this value. It should reflect the variability of the terrain in the coverage area of that sector, and any variability due to large buildings. Terrain height parameters are in meters and the average height of the terrain reflects the height above the ellipsoid (as opposed to the average sea level).

FIG. 7 shows each cell sector coverage area (sector A, sector B, sector C, and sector D) for base station antennas 61, 62, 63, and 64. Repeater 65 extends the coverage area of base station antenna 64. Prior to initiating the positioning process, even before the mobile station 66 receives the traffic channel, sector identity information is recorded. Since some time since the mobile station 66 is in a communication state, the mobile station starts to position. Mobile station 66 records the current PN number and transmits the number along with the recorded sector identity information to the PDE in the IS-801.1 message. The mobile station 66 may be handed off to a sector other than the sector in which the sector identity information is recorded, for example, the mobile station may enter sector B from sector A when the mobile station reaches position 67, shown in dashed lines. Is handed off. In this case, the current PN number and sector identity information may belong to different cells. That is, the sector identity information belongs to the serving sector while the PN number belongs to the reference sector. In addition, PN is not unique and is typically repeated many times within any cellular network.

In addition, sector range measurements observed by the mobile station at that time, including the reference sector and other sectors, are transmitted in this initial IS-801.1 message. These sectors can only be identified by their PN numbers and are known as measurement sectors. In addition, the serving sector and the reference sector when observed are measurement sectors. Only AFLT measurements are used and these range measurements are used to produce coarse positions (known as prefixes) that are typically less accurate than the last fix performed later.

The purpose of the prefix is to use only the recognition of the reference sector to generate a more accurate initial position estimate that can be more accurate GPS assistance information than is possible. More accurate GPS assistance information improves GPS accuracy and yield, and reduces processing time. The prefix is optional and uses an initial position estimate based on the reference sector if it is unavailable for some reason.

After the GPS assistance information is sent to the mobile station, the mobile station collects a set of GPS measurements known as the last fix and a second set of AFLT measurements. Since the PN number is not unique, the PDE must determine which PN number belongs to which physical sector. Often this is not easy because sectors with the same PN number are about 8 km or closer to each other. This interval is used to determine the reference sector from the serving sector and the measurement sector from the reference sector. Only cells within the distance threshold are considered. The distance threshold is determined by scaling the maximum antenna range parameter of the BSA.

If no sector with target PN and target frequency is found, the search fails. Similarly, if one or more sectors with the target PN and target frequency are found but the PDE cannot determine which is real, the search fails. If one sector with the target PN is found, the search is successful and assume that the sector belongs to the observed PN. If the search fails when trying to determine the reference sector from the serving sector, then the serving sector is assumed to be the reference sector. If the search fails when trying to determine the measurement sector from the reference sector, the measurement PN is unavailable and ignored. If no sector identity information is found in the BSA, GPS location determination is attempted using default initial position estimate information stored in the PDE's configuration file or registry.

In addition, an initial position estimate may be generated based on the network ID / system ID and the coverage area center. In this method, the PDE automatically determines the uncertainty and location for the coverage area of all cells with their own unique network ID and system ID by examining all sectors in the BSA. This information serves several purposes. If a better initial position estimate is not available, network ID / system ID location and uncertainty may be used. This occurs, for example, when no sector identity information observed by the MS is found in the BSA. In this case, the initial position estimate has much greater uncertainty, which can reduce GPS accuracy and yield, resulting in greater MS processing time. If all the better methods of determining the final fix location are not available, then network ID / system ID center location and uncertainty are reported.

That is, GPS and AFLT positioning information from the hybrid mobile station may be combined to generate pseudorange offsets and base station time base offsets. In addition to providing the base station time base offset for base station calibration, pseudorange offsets at various physical locations in the wireless coverage area, such as for various cell sectors, are used for correction of the position fix of the mobile station determined to be near the cell sector. Collected and used. For example, the distance correction value is measured as the forward link correction value (FLC). In particular, the FLC is defined as the time difference between the time stamp for the data transmitted by the mobile station and the actual transmission time.

The components that contribute to the FLC are the cable delay of the base station GPS receive antenna, the GPS receiver timing strobe output to the base station transmit hardware timing strobe input, and the base station transmit antenna. The base station calibration server automatically adjusts the FLC field in the base station satellite force database based on GPS and AFLT positioning data from the hybrid mobile station. By using more accurate FLC values for sectors, range measurements can be improved from about 0% to 30%.

Since the GPS pseudorange is much more accurate, if a sufficient number of GPS satellites are observed, the final reported fix is almost entirely based on GPS. Fortunately, in these cases, the distance estimate for the sector antenna is still measured and stored in the PDE log file. Thus, all the information needed to determine the new calibration FLC value is available. This information may include previous "default" or "average" FLC values; And fix positions determined using GPS measurements, sector antenna positions from the base station satellite force database, and distance estimates measured for each cell sector antenna, and determined by AFLT techniques using pilot phase measurements. The following equation,

Associates these inputs with the new FLC values.

The above equation is to omit the unit conversion constant. For example, if the FLC is measured in so-called pseudorange number chip_x_8 units, the formula for the new FLC value is

Where FLC _NEW is the new forward link calibration value (chip_x_8 units), FLC _OLD is the forward link calibration value (chip_x_8 units) used during the acquisition of the PDE, and Residual is the ground truth. ) Is the remainder (in meters) of the pseudorange measurement of a particular sector, which appears from the PDE when unknown, and 30.52 is the number of meters per chip_x_8 unit.

Since any fix position error is converted to an error in the new FLC value, the key to the FLC adjustment is that the position fix must be very accurate. The fix position can be determined very reliably using the "Horizontal Estimated Position Error" quality measurement, which is an estimate of the PDE itself for the error of each position fix. Therefore, only fixes that meet certain quality thresholds, such as having a HEPE value of less than 50 meters, should be used for these calculations.

Pilot measurements are calculated in all sectors listened to by the handset according to each fix. Depending on the situation, typically, this fix is at least a small amount of sectors, often more than 20 in dense urban environments. Thus, each fix yields a number of distance estimates, all of which are available in this process.

An initial base station satellite force database must be present in this process so that the PDE can determine the sector identity of each observation sector. However, the quality of the FLC values for these sectors is not important. The "default" or "average" value of the FLC can be used. It is important that the sector identity observed by the handset exists in the base station satellite power database. It is desirable that the antenna position be quite accurate, but the antenna position does not always need to be known accurately. If the perception of the antenna position improves over time, this may be a factor in obtaining the antenna position more reliably and may be used to improve forward link calibration accuracy. The base station satellite power database server may also determine whether the antenna has moved, in which case the correct but timed antenna position may be removed from the base station satellite power database and replaced with the updated position.

8 and 9 illustrate an example of how a PDE may be programmed to determine the measurement location of a mobile station. In the first step 81 of FIG. 8, the PDE generates an initial position estimate based on the AFLT measurement initially sent from the MS to the PDE. In step 82, the PDE attempts to associate the PN observed by the mobile station with a particular cell sector recorded in the base station satellite force database. If the sector serving the MS cannot be uniquely identified, AFLT is not possible because the PDE cannot determine which AFLT range measurement is occurring from which base station antenna tower. Thus, if the sector serving the MS cannot be uniquely identified, execution branches from step 83 to step 84. Otherwise, execution proceeds from step 83 to step 85.

Step 84 generates Sensitivity Assist (SA) and Acquisition Assist (AA) data based on the network ID or system ID center or default location. In order to support the MS in GPS acquisition and GPS pseudorange measurement, SA / AA data is sent to the MS (step 90 in FIG. 9). Since no serving cell is found, AFLT is not possible and GPS accuracy and yield may be seriously compromised. Execution proceeds from step 84 to step 90 of FIG.

In step 85 of FIG. 8, the PDE attempts to determine the reference sector and all measurement sectors. If the measurement PN cannot be uniquely associated with a single sector, then the range measurement is not used. If the reference cell cannot be uniquely determined, the serving cell is appropriately used. Next, in step 86, the PDE calculates the "prefix" based only on the AFLT. Then, in step 87, if the "prefix" calculation of step 86 is unsuccessful, execution branches to step 89. Otherwise, execution proceeds from step 87 to step 88.

In step 88, SA / AA data is generated based on the cell sector information. Execution proceeds from step 88 to step 90 of FIG.

In step 89 of FIG. 8, SA / AA data is generated based on the prefix position and the uncertainty. The smaller the initial position uncertainty, the more accurate the AA data, the faster the processing in the MS, and the better the final fix accuracy and yield. Execution proceeds from step 89 to step 90 of FIG.

In step 90 of FIG. 9, SA / AA data is transmitted to the MS. The MS uses SA / AA data for GPS acquisition and GPS pseudorange measurements. The MS searches for the GPS satellites indicated in the assistance data and performs the second round of AFLT pseudorange search. In step 91, the PDE receives GPS and AFLT pseudoranges from the MS. In step 92, the PDE again attempts to identify all PNs. If the PN cannot be uniquely identified as a single sector, its range measurement is not used. In step 93, the PDE generates a final fix based on the GPS and AFLT range measurements.

In step 94, the PDE may calculate the final position using several methods simultaneously, using the method most likely to obtain the minimum position. Since accuracy is much better than any other method, first try GPS positioning. If GPS positioning fails, the PDE selects from several different methods and uses the result with the least relevant error estimate. These other methods include AFLT-only; Location determined by sector direction and approximate range of recognition using RTD measurements (if available); A " mixed cell sector " fix, determined using the sector observed by the mobile station and the recognition of the location and direction of each sector; Current serving sector coverage area center location determination (ie, the original serving sector if the current serving sector cannot be determined); Center location of current network ID / system ID coverage area; And finally the default location stored in the configuration file of the PDE.

Using the FLC for each sector to correct the MS location near the sector is preferably used for accumulating and statistical analysis of multiple distance estimates for various mobile stations in each sector, from various locations within the sector coverage area. Can be improved. By collecting a sample set, statistical processing on that set can be applied to determine the new best FLC value to use. Averaging this data and using data collected from various sets of locations within the coverage area of each sector have been provided to yield more accurate FLC values.

The sample set may be collected from a conventional location session and / or from a drive-around field collection during a normal telephone call to / from the hybrid mobile station. For additional quality of the collected data, drive-around field collection can be performed by technical field personnel in a vehicle equipped with a hybrid mobile handset, each linked to an external PCS antenna and an external active GPS antenna. In the region using multiple CDMA frequencies, since each sector-CDMA-frequency substitution is calibrated separately, data must be collected for each frequency. For example, when using the drive-around method, multiple handsets must be used to ensure sufficient frequency diversity.

10 shows a flowchart of a method for the base station satellite power database server to generate a base station satellite power database. In a first step 101, the base station satellite power database server collects the initial base station satellite power database using conventional known data and " default " forward link calibration values. This information includes cell sector identity information (network ID, system ID, extended base station ID, PN number, etc.), sector antenna position latitude / longitude / altitude, and information about the coverage area of this sector. The "default" forward link calibration value can be obtained or estimated from experience with similar infrastructure equipment or by calibrating small test areas using the same infrastructure equipment. In an optional second step 102, the accuracy of the antenna position can be improved by collecting more accurate antenna position estimates, if desired. After step 102, an initial base station satellite power database is created.

In step 103, position fix data is collected from a typical position measurement session as described above, and / or from a drive-around field collection, to perform a position fix calculation by the PDE. Then, in step 104, the base station satellite power database server generates a new base station satellite power database, including the new FLC values, from the position fix data from the previous base station satellite power database and the PDE log file. Repeat steps 103 and 104 as needed to process the new PDE log file to adjust the base station satellite power database in time according to various changes in the wireless network, network equipment, and network environment. In practice, steps 103 and 104 can be repeated in time using different PDEs and different base station satellite power database servers.

In addition, analysis of the position fix data set is useful for determining other parameters in the base station satellite force database, such as the "maximum antenna range (MAR)". For example, the base station satellite power database server adjusts the MAR to satisfy two purposes. First, the MAR must be large enough that there are 99% mobile units within the MAR of the antenna and 100% mobile units within 2 * MAR using a particular base station. Second, the MAR must be small enough so that two base stations with the same PN and frequency do not have an overlapping MAR. Proper coordination of MAR produces better base station search success and better GPS acquisition support window in the PDE.

The base station satellite power database server uses the same process to determine a new MAR as to determine a new FLC. Each fix in the measurement file is checked to see if it is "sufficient". If the measurements meet the following default criteria: successful location measurement by the GPS or hybrid or AFLT method, fix HEPE of 500 meters or less, and the remaining measurement criteria of 300 meters or less, then use those measurements to determine a new MAR. do.

In addition to the FLC and MAR, the base station satellite force database server calculates the FLC uncertainty, the cell sector center position, the average height of the terrain using the terrain height database, and its standard deviation (uncertainty).

11 shows an example of a specific configuration for the base station satellite power database server 43. The base station satellite power database server 43 periodically updates the base station satellite power database 110 at the PDE 41 by holding a "master" or first copy of the base station satellite power database 44. In addition, when each PDE serves each base station, one base station satellite power database server may serve more than one PDE. For each position fix, the measurement information is transmitted from the PDE 41 to the base station satellite force database server 43. The base station satellite power database server collects as much information as necessary to perform techniques for detecting and solving problems with inconsistent, inaccurate and incomplete data, and locally stores a copy of the collected data.

In addition, the base station satellite power database server 43 notifies the system operator 112 of the possible presence of incomplete or inaccurate data in the first base station satellite power database 44 and notifies calibration of the incorrect or incomplete data. Has a graphical user interface 111. The base station satellite power database server may also provide the system operator 112 with network data and services other than location calibration data and base station satellite power database maintenance, such as cellular coverage maps and analytical reviews.

The base station satellite power database server 43 receives the base station satellite power database update value from the system operator 112, integrates the update information into the first copy of the base station satellite power database 44, and sends the update information to the PDE 41. Manage the delivery to If the cellular infrastructure or cellular infrastructure configuration is physically changed, the base station satellite power database server 43 is subject to previous conditions until all PDEs serviced by the base station satellite power database server 43 are switched to the new condition. And a record reflecting the new condition in the base station satellite power database. Base station satellite power database server 43 manages the time when a new record is removed from each PDE and the time when a previous record is removed from each PDE. The base station satellite power database server also maintains PDE performance tracking information 113 and terrain height database 114.

12 shows that one base station satellite power database server 120, 121 can support multiple PDEs 122, 123, and that multiple base station satellite power database servers 120, 121 can support multiple PDEs (for complete redundancy). 122 and 123) can be supported at the same time.

13 illustrates various field groups in a base station satellite power database. The field group includes cell sector identity information (for IS-95: network ID, system ID, switch number, extended base station ID, and PN), pilot sector name, antenna position latitude, longitude and altitude (height above ellipsoid), cell Sector center location-latitude, longitude, and altitude (height above ellipsoid), antenna orientation, antenna aperture, maximum antenna range (MAR), terrain average height, RTD corrections, FWD link corrections, potential repeaters, PN increments, And uncertainty parameters (eg, accuracy and standard deviation).

The RTD calibration is the calibration of the base station receive chain over GPS time. Factors affecting this calibration are base station GPS cable length, GPS receiver delay, base station receiver antenna cable length, and base station receiver processing delay.

14 illustrates a description of cell sector identity information and a problem detection method used by the base station satellite power database server with reference to this information. The cell sector identity information is a key that associates the signal observed by the handset (ie, wireless mobile station) with information in the base station satellite power database. In particular, the cell sector identity information must be complete and accurate and free of duplicates or errors for good positioning performance. The new or modified cellular infrastructure or cellular infrastructure configuration is changed to change the cell sector identity. Such changes are frequent.

The base station satellite power database server knows when an identity observed by the handset is not found in the base station satellite power database and tracks that occurrence over time. The base station satellite power database server identifies new sectors added to the network and notifies the system operator of such changes. The base station satellite force database server generates base station satellite force database entries that include determination of antenna position, observed identities, automatically calculated calibration and uncertainty parameters, and default values. In addition, the base station satellite power database server identifies sectors for which the identities observed by the handset or reported by the cellular infrastructure have changed due to a change or reconfiguration of the network and no longer match the base station satellite power database. The base station satellite power database server automatically changes the base station satellite power database to reflect the new identity.

Fig. 15 shows a description of antenna position information and a problem detection method used by the base station satellite power database server with reference to this information. For terrestrial range measurements, the antenna position allows the PDE to determine the reference sector and the measurement sector identity, where the range measurements occur. Antenna position error translates to ground range error. In addition, antenna position is essential for generating an "initial position estimate" used to generate GPS assistance information.

The base station satellite force database server identifies base station satellite force database sector antenna positions that do not match the measured position. This may result from a typo or mobile cell (COW and COLT) in the base station satellite power database. The base station satellite power database server notifies the system operator of such a problem, and if so configured, the base station satellite power database server automatically corrects the problem.

16 illustrates a description of cell sector center information and a problem detection method used by the base station satellite power database server with reference to this information. Sector center position is returned as a result when a more accurate positioning method fails. In addition, the sector center position is essential for generating an "initial position estimate" used to generate GPS assistance information. Cell sector center is one of the parameters that enable the PDE to know the sector coverage area. Recognition of the sector coverage area is the key for successfully associating the observed terrestrial signal with an entry in the base station satellite force database.

The base station satellite power database server maps sector coverage areas based on MS positioning sessions so that the most optimal cell sector center location is updated over time. The base station satellite power database server also updates the base station satellite power database to the most optimal cell sector location.

Fig. 17 shows the description of antenna direction, antenna aperture, and maximum antenna range information, and a problem detection method used by the base station satellite force database server with reference to this information.

The antenna direction is the direction in which the cell sector antenna is pointed. Often, the antenna direction is used to determine the approximate sector coverage area and sector center location by the off-line tool. The base station satellite power database server maps the sector coverage area, determines the most optimal antenna direction over time, and updates the base station satellite power database with the optimal antenna direction.

Antenna openings (beam widths) are often used by the off-line tool to determine approximate sector coverage areas and sector center positions. The base station satellite force database server maps the sector coverage area, determines the most optimal antenna aperture over time, and updates the base station satellite force database with the optimal antenna aperture.

The maximum antenna range (MAR) is a key parameter used by the PDE to measure the sector coverage area. Recognition of the sector coverage area is the key for successfully associating the observed terrestrial signal with an entry in the base station satellite force database. The base station satellite power database server maps the sector coverage area, determines the most optimal MAR over time, and updates the base station satellite power database with the optimal MAR.

18 illustrates a description of average height information of the terrain and a problem detection method used by the base station satellite power database server with reference to this information. The average height of the terrain is required with AFLT because the AFLT fix can drift significantly if the height is not constant. In addition, recognition of height results in one small measurement from the range measurement that can greatly improve the location fix availability. The base station satellite power database server maintains the average height of the terrain in the terrain height database (114 in FIG. 11). In addition, the base station satellite power database server tracks the height returned from the location fix with low uncertainty, updates the average height of the terrain in the base station satellite power database if necessary, and adjusts the standard deviation of the terrain to reflect the distribution of the actual fix. Set automatically.

19 illustrates a description of round-trip delay (RTD) correction and forward link correction values, and a problem detection method that the base station satellite power database server uses with reference to this information.

RTD corrections are specifically intended to improve the accuracy of reverse link AFLT range measurements. The base station satellite database server automatically improves the accuracy of RTD corrections and RTD corrections over time using real user measurements.

Forward link calibration is specifically intended to improve the accuracy of forward link terrestrial AFLT range measurements in IS-95 CDMA systems. The forward link calibration error translates to an AFLT range measurement error that translates into a positioning error. The base station satellite power database server automatically improves the accuracy of forward link calibration and forward link calibration over time using real user measurements.

20 illustrates a description of potential repeater and PN incremental information and a problem detection method used by the base station satellite power database server with reference to this information.

Potential repeater information relates to situations where a repeater is used but the PDE does not know it. In this situation, AFLT range measurements can be very wrong, and the AFLT algorithm will not be stable. For this reason, the identity of any sector using relay must be known in the base station satellite power database. The base station satellite power database server detects the presence of an unknown relay and corrects the base station satellite power database accordingly. The base station satellite power database tracks the frequency with which each notified repeater is observed. The base station satellite power database also removes the repeater usage flag, or notifies the operator if the repeater does not appear to be present.

The PN increment information allows the PDE to accurately determine the number of PN offsets of remote base stations. Since it is easy to understand, it does not need to be included in the base station satellite power database. The base station satellite force database server detects PN incremental discrepancies between what is observed over the air and within the base station satellite force database, and if a mismatch is detected, the base station satellite force database server is responsible for PN incremental information in the base station satellite force database. Calibrate

Fig. 21 illustrates the description of the uncertainty parameter and a problem detection method used by the base station satellite power database server with reference to this uncertainty parameter. Uncertainty parameters such as “antenna position accuracy”, “standard deviation of ground height”, “RTD calibration accuracy”, and “FLC accuracy” limit each position and calibration parameter, and the PDE uses the parameters to measure the range. Allows you to construct an overall estimate of the uncertainty and an error estimate for the last position fix.

For example, for antenna position accuracy, the limit that antenna latitude and longitude will be within this distance of true position is 99% accuracy. In the case of the standard deviation of the terrain height, the limit is that about 68% of the height to be found in the coverage area of this sector is within the standard deviation of one terrain height relative to the average height of the terrain. For RTD calibration accuracy, the limit that a true RTD calibration will be within one RTD calibration accuracy of the RTD calibration is 99% confidence. For FWD link calibration accuracy, the limit that a true forward link calibration will be within one FWD link calibration accuracy of that FWD link calibration is 99% confidence.

If a very accurate final position fix is available, the base station satellite power database server uses this perception to measure the uncertainty of the terrestrial range measurements observed at these fixes. The base station satellite power database server assigns this uncertainty to the uncertainty parameter used to construct each range and automatically updates the uncertainty parameter once there are enough samples to establish confidence in the new value. The base station satellite power database server tracks changes in time and updates the uncertainty parameters in the base station satellite power database.

Many of the problem detection methods described above take advantage of the fact that the position estimates of a cellular handset are known with fairly good accuracy depending on the results of the position measurement itself. This acknowledgment is a key for providing context to the fix measurements analyzed and stored by the base station satellite power database server.

In addition, the position fix uncertainty of the handset is calculated by the PDE. This uncertainty also improves the usefulness of handset location, for example by allowing only fixes with very good accuracy to be used for a valid purpose only in this case.

As listed in Figure 22, an example of a problem detection method using the position estimate of a cellular handset is inverse sector antenna positioning (hereinafter described further), forward link calibration and RTD calibration, incorrect sector identity in the PDE. Determination, detection of repeater presence, detection of new or moved sectors, determination of uncertainty parameters, and provision of cellular coverage maps and diagnostic information.

Inverse sector antenna positioning is a method of determining the position of a sector antenna in data from a mobile station. In some cases, a cell sector is known to exist based on the handset measurement of that sector signal, but the sector antenna position is unknown. If the handset position can be determined based on other measurements, the handset position and measured range for the sector antenna can serve as an important input for determining the position of the sector antenna.

In most cases, the handset location may know the source for the unknown sector based on, for example, a good GPS fix or an AFLT fix or hybrid fix that does not use measurements from an unknown sector. It may be determined without. If this occurs multiple times from different positions, each of these position-fixes is provided as a range for the original fix (handset position) and the antenna position of this unknown sector.

These positions and ranges may be provided as input to a navigation processor, for example, which may calculate sector antenna positions in the same way that GPS satellite positions and ranges are used to calculate the position of a GPS receiver. Many methods can be used to perform such navigation processing, such as least-mean-square iteration and Kalman filtering, which are well known to those skilled in the art.

In addition, as will be appreciated by those skilled in the art, it is important that the reference points are sufficiently spaced relative to the range for the sector antenna so that the geometry is adequate to accurately calculate the sector antenna position. In addition, each input range from the handset location should have an error estimate associated with combining the uncertainty at the reference handset location with, for example, the estimated uncertainty in that range due to excessive path length signal delay. These measurement error estimates can be combined in a navigation-processing algorithm to estimate the error in sector antenna positioning.

In addition, range measurements for sector antennas may include very constant biases due to sector transmitter time bias. This forward link calibration can be resolved at the same time as the sector antenna position. Thus, the time-bias, the sum of the four variables, as well as the three-dimensional sector antenna position, can be calculated in the same operation, in a manner similar to the GPS receiver positioning that calculates the GPS receiver positioning and clock bias.

One way to improve the base station location and base station timing offset is to maintain a log of measurements appropriate for that base station location and timing offset and recalculate the base station location based on all measurements in that log. However, if the number of measurements is large, the calculation time and storage amount may be exceeded. In this regard, only a certain number of recent measurements can be used to calculate the base station location and timing offset. In addition, a filter such as a Kalman filter may be used to continue to improve the base station location and timing offset values. In a simple example, the latest measurement yields an estimated position P _e , and the new position P _new is

Is calculated as the weighted average of the previous position P _old and the estimated position P _e , where α is a weighting coefficient less than one. The weighting coefficients are selected based on each average of the number of measurements (N) and the relative error (E) of those measurements that contribute to the previous and estimated values, for example,

to be.

The filter may also be used in a similar manner to calculate the new value for the base station timing offset from the old value and the new estimate, but in this case it is desirable to estimate the drift over time of the timing offset. That is, the base station timing offset Toff is It is modeled as a linear function over time t as From a series of measurements over time, the parameters β and T ₀ are estimated by the least squares method. If the number of series of measurements is exceeded, only a suitable number of latest measurements remain in the log and used to produce an estimate for β and an estimate for T ₀ . The new value for β is calculated from the old value and the estimated value β of β, new values for T ₀ is calculated from the old value and the estimated value of T ₀ T _0.

In addition, weighting coefficients may be used to calculate the position and timing offset of the mobile station from various location service parameters. For example, multiple ranges must be combined to triangulate the position of the mobile station. This is true in the case of AFLT, RTD or GPS technology. If a number of relatively independent positioning can be performed, the position value and the uncertainty can be calculated for each independent positioning and then each weight is inversely proportional to the uncertainty for each position. Calculate the weighted average of the position values. For example, the uncertainty of the range measurement may depend on the strength of the pilot signal, the resolution of the PN sequence, the satellite height (for GPS ranging), and the multi-path propagation probability (for ground range measurement). . In addition, the uncertainty of the range measurement may include uncertainty at forward link calibration timing offset (for AFLT range determination), uncertainty at reverse link calibration (for RTD range measurement), and base station antenna position and terrain height (AFLT or RTD range measurement). Depend on the uncertainty of the underlying location service parameter, such as Uncertainty is measured, for example, in terms of standard deviation, based on statistics where a sample population is present, or based on known resolution and estimated measurement errors assuming Gaussian distribution.

The solution to the vertical height of a sector antenna may often be difficult due to the limited observation arrangement in the vertical direction. The sector antenna height may be estimated based on the average antenna height (ie 10 meters) greater than the average height of the handset reference position and / or the height of the terrain based on a search of the terrain height database. Errors in the vehicle height of the sector antennas are somewhat difficult to observe in this method, but fortunately, if those sectors are eventually added to the base station satellite force database and used as a reference location for handset positioning, these same errors are associated with the position fix. Contributes very small.

Once the sector antenna position has been significantly determined by this method, a new sector may be added to the base station satellite force database and subsequently used for handset positioning, or an unidentified signal observed by the handset may be the base station satellite force. Entries in the database may be combined with incorrect identity information and this identity information may be corrected.

An additional function derived from the base station satellite power database server is a detailed understanding of cellular coverage. The base station satellite power database server may associate a location for signal strength with other cellular diagnostic information of all cell sectors observed from this location. Coverage maps and diagnostic metrics, and performance alerts are possible based on this knowledge. The user may be warned of degraded or damaged cellular or location performance as a function of location.

As such, a wireless communication network including hybrid (GPS and AFLT) mobile stations has been described. The hybrid mobile station provides residual position information used for time base calibration and / or correction of position measurements. Any mobile station (ie, handset or cellular telephone) can be used as test equipment, and data from a typical wireless telephone call can be supplemented by data from a drive-around field test unit. Base station calibration data is stored in base station satellite power along with additional base station information used to obtain the most reliable location fix, according to various conditions. In addition to the location of the base station antennas, forward link delay corrections, and base station identification information, the base station satellite force record includes the center location of the base station sector coverage area, the maximum range of the base station antenna, the average height of the terrain relative to the sector coverage area, and the sector coverage area. Standard Deviation of Terrain Height, Round-Trip Delay (RTD) Correction Information, Repeater Information, Pseudo-Random Noise (PN) Increment, Uncertainty of Base Station Antenna Position, Uncertainty of Forward Link Delay Correction, and Round-Trip Delay Correction Includes the uncertainty of

Claims (43)

A method of using base station satellite power in a wireless communication network, Storing, in the base station satellite force, sector center position data specifying a center position of a cell sector of base stations; And Using the sector center position data in the base station satellite force to determine a mobile station position. The method of claim 1, If a mobile station is found in the cell sector and the location of the mobile station cannot be determined more accurately, determining that the mobile station is at or near the center of the cell sector. The method of claim 1, If the mobile station is found within several cell sectors and the location of the mobile station cannot be determined more accurately, the mobile station includes determining that the mobile station is at or near an average of several cell sector centers. How to use. The method of claim 1, If a mobile station is found within a certain area, but individual cell sectors cannot be determined and the location of the mobile station cannot be determined more accurately, the mobile station determines that it is at or near the average of all cell sector centers within a certain area. And using the base station satellite power. The method of claim 1, Using cell sector position data of a cell sector as an initial position estimate for generating assistance information supporting position determination using a global satellite system. The method of claim 1, Wherein the cell sector position is an average of mobile station positions determined to be within the cell sector. A method of using base station satellite power in a wireless communication network, Storing, in the base station satellite power, maximum antenna range data specifying a maximum antenna range of base stations; And Using the maximum antenna range data in the base station satellite force to determine a mobile station location. The method of claim 7, wherein Using the maximum antenna range of one or more base stations to measure a sector coverage area of the base station to associate an entry for the base station within the base station satellite power with an observed terrestrial signal. . The method of claim 7, wherein If the uncertainty at the mobile station location cannot be determined more accurately, using the maximum antenna range of one or more base stations to measure the uncertainty in the location estimate of the mobile station. A method of using base station satellite power in a wireless communication network, Storing, in the base station satellite power, average height information of the terrain for the cell sector coverage area of the base stations; And And determining a mobile station location using average height information of the terrain within the base station satellite force. The method of claim 10, And using the average height information of the terrain, to obtain a location fix of a mobile station. The method of claim 11, Storing in the base station satellite force a standard deviation of the terrain height with respect to the cell sector coverage area of the base stations; And Determining a degree of weighting average height information of the terrain from the base station satellite power using the standard deviation of the terrain mean height. The method of claim 10, Storing in the base station satellite force a standard deviation of the terrain height with respect to the cell sector coverage area of the base stations; And Determining a degree of weighting average height information of the terrain from the base station satellite power using the standard deviation of the terrain mean height. A method of using base station satellite power in a wireless communication network, Storing round-trip delay (RTD) calibration information in the base station satellite power; And Using the round-trip delay (RTD) calibration information in the base station satellite force to determine a mobile station location. The method of claim 14, Using the round-trip delay (RTD) calibration information to improve the accuracy of a reverse link range measurement. A method of using base station satellite power in a wireless communication network, Storing repeater information in the base station satellite power indicating whether a cell sector coverage area of the base stations has a repeater; And Using the repeater information in the base station satellite force to determine a mobile station location. The method of claim 16, Using the repeater information when using an AFLT (Advanced Forward Link Trilateration) range measurement. The method of claim 16, And using the repeater information when calculating GPS acquisition assistance information. A method of using base station satellite power in a wireless communication network, Storing, in the base station satellite power, each pseudo-random noise (PN) increment for base stations; And And determining a mobile station location using the pseudo-random noise (PN) increment in the base station satellite force. The method of claim 19, Using the pseudo-random noise (PN) increment to determine the number of pseudo-random noise (PN) offsets of base stations that are apart from each other. A method of using base station satellite power in a wireless communication network, Storing base station antenna positions for base stations in the base station satellite power; Storing, in the base station satellite force, an uncertainty in the accuracy of the base station antenna position relative to base stations; And Using the uncertainty in the accuracy of the base station antenna position within the base station satellite force to determine a mobile station position. The method of claim 21, Using the uncertainty in the accuracy of the base station antenna position to determine a weight to apply to measurements from the base station. A method of using base station satellite power in a wireless communication network, Storing a forward link time offset correction for the base stations in the base station satellite power; Storing in the base station satellite power an uncertainty in the accuracy of the forward link time offset correction for base stations; And Determining a mobile station location using an uncertainty in the accuracy of the forward link time offset correction within the base station satellite force. The method of claim 23, Determining a weight to apply to measurements from the base station, using the uncertainty in the accuracy of the forward link time offset correction for the base station. (a) base stations for communicating with mobile stations; (b) base station satellite power for storing information about the base stations; And (c) one or more positioning entities for determining the location of the mobile stations, based on signals transmitted between the base stations and the mobile stations, and information stored in the base station satellite power, The base station satellite power comprises sector center position data specifying a center position of a cell sector of the base stations. The method of claim 25, Wherein the sector position data includes latitude and longitude of each cell sector center. The method of claim 26, The sector position data further comprises an altitude of each cell sector center. The method of claim 25, And the location entity returns the center of the cell sector if the location entity determines that the mobile station is within a cell sector and the location entity is unable to more accurately determine the location of the mobile station. The method of claim 25, The location entity uses the cell sector location data of a cell sector as an initial location estimate for generating assistance information supporting location determination using a global satellite system. The method of claim 25, Wherein the cell sector center position is an average of mobile station positions determined to be within the cell sector. (a) base stations for communicating with mobile stations; (b) base station satellite power for storing information about the base stations; And (c) one or more positioning entities for determining the location of the mobile stations, based on a signal transmitted between the base stations and the mobile stations, and information stored in the base station satellite power, And the base station satellite power includes maximum antenna range data specifying the maximum antenna range of the base stations. The method of claim 31, wherein The location entity uses the maximum antenna range of one or more base stations to measure a sector coverage area of the base station to associate an entry for the base station within the base station satellite force with an observed terrestrial signal. (a) base stations for communicating with mobile stations; (b) base station satellite power for storing information about the base stations; And (c) one or more positioning entities for determining the location of the mobile stations, based on a signal transmitted between the base stations and the mobile stations, and information stored in the base station satellite power, The base station satellite power comprises average height information of the terrain for the cell sector coverage area of the base stations. The method of claim 33, wherein The average height information of the terrain comprises an average height of each terrain and a standard deviation of each terrain for each of the cell sector coverage areas of the base stations. The method of claim 33, wherein And the positioning entity obtains an AFLT location fix of at least one of the mobile stations using the average height information of the terrain. (a) base stations for communicating with mobile stations; (b) base station satellite power for storing information about the base stations; And (c) one or more positioning entities for determining the location of the mobile stations, based on a signal transmitted between the base stations and the mobile stations, and information stored in the base station satellite power, Wherein the base station satellite power comprises round-trip delay (RTD) calibration information. The method of claim 36, And the positioning entity uses the round-trip delay (RTD) calibration information to improve the accuracy of reverse link range measurements. The method of claim 36, The base station satellite force stores an estimate of the uncertainty of the round-trip delay correction of base stations, And the positioning entity uses the uncertainty of the round-trip delay correction to determine the degree of weighting the round-trip delay measurement from the base station. (a) base stations for communicating with mobile stations; (b) base station satellite power for storing information about the base stations; And (c) one or more positioning entities for determining the location of the mobile stations, based on a signal transmitted between the base stations and the mobile stations, and information stored in the base station satellite power, The base station satellite power includes repeater information indicating whether the cell sector coverage area of the base stations has a repeater. The method of claim 39, The location entity uses the repeater information when obtaining an AFLT range measurement. (a) base stations for communicating with mobile stations; (b) base station satellite power for storing information about the base stations; And (c) one or more positioning entities for determining the location of the mobile stations, based on a signal transmitted between the base stations and the mobile stations, and information stored in the base station satellite power, And the base station satellite power includes respective pseudo-random noise (PN) increments for the base stations. 42. The method of claim 41 wherein And the positioning entity uses the pseudo-random noise (PN) increment to determine the number of pseudo-random noise (PN) offsets of base stations that are apart from each other. (a) base stations for communicating with mobile stations; (b) base station satellite power for storing information about the base stations; And (c) one or more positioning entities for determining the location of the mobile stations, based on a signal transmitted between the base stations and the mobile stations, and information stored in the base station satellite power, The base station satellite power is sector center position data specifying the center position of the cell sector of the base stations, maximum antenna range data specifying the maximum antenna range of the base stations, average height information of the terrain for the cell sector coverage area of the base stations, A wireless communication network comprising round-trip delay (RTD) calibration information, repeater information indicating whether a cell sector coverage area of the base stations has a repeater, and respective pseudo-random noise (PN) increments for the base stations; .