JP2001268622A - Method and device for recognizing current position of mobile station, the mobile station, and base station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem caused by the fact that current position recognition using PHS, etc., is low in resolution and recognition using a GPS receiver costs more. SOLUTION: Reception state information depending upon a position is measured at all spots as objects of current position recognition and a reception state information-position information correspondence table is generated which has the reception state information and position information on the spots made to correspond to each other. Then corresponding position information is obtained by referring to the reception state information-position information correspondence table according to the reception state information depending upon the current position measured or obtained by reception by using channels to one or plural base stations 101 and the current position of the mobile station 104 is estimated with high precision without any increase in cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to CDMA (Co)
de Division Multiple Access
s) The present invention relates to a method and apparatus for recognizing a current position of a mobile station and a current position recognizing apparatus for recognizing the current position of the mobile station using a wireless communication system.

[0002]

2. Description of the Related Art As a conventional method of recognizing a current position of a mobile station and a current position recognizing device, techniques disclosed in Japanese Patent Application Laid-Open Nos. Hei 6-138821 and Hei 4-87000 are generally used. That is, a method of recognizing the current location of the mobile station from information on a cell of the base station which the mobile station is receiving, utilizing the characteristic that the communication area that can be covered by the base station in the PHS communication system or the like is used,
A method using an S receiver is generally used as a method for recognizing the current position of a mobile station.

[0003]

The conventional method and apparatus for recognizing the current position of a mobile station are constructed as described above. Therefore, the current position of the mobile station is determined only by the cell information of the receiving base station. However, there is a problem that the resolution of the current position recognition becomes low in the method of recognizing the current position.

[0004] Further, in the case of recognizing the current position of a mobile station using a GPS receiver, a new GPS receiver has to be added, and the cost increases.

The present invention has been made to solve the above-mentioned problems, and utilizes the features of the CDMA wireless communication system to increase costs by adding new hardware such as a GPS receiver. It is an object of the present invention to obtain a current position recognition method and a current position recognition device for a mobile station and a mobile station and a base station, which can avoid the current position of the mobile station with high accuracy.

[0006]

According to the present invention, there is provided a method for recognizing a current position of a mobile station, comprising: transmitting a signal from one or a plurality of base stations in a CDMA communication system performed between the base station and the mobile station; Receiving, measuring or acquiring the reception state information depending on the position, and previously measuring or acquiring the reception state information and the reception state information based on the signal from the base station in the communication area of the base station. The present position of the mobile station is determined based on the reception status-position correspondence information measured at the point and stored in association with the position information of each measurement point.

[0007] In the mobile station current position recognition method according to the present invention, the reception state information includes sector information and a reception level.

In the mobile station current position recognition method according to the present invention, the reception state information includes a propagation delay amount and a multipath environment.

A mobile station current position recognition method according to the present invention utilizes a broadcast channel of a base station and measures a reception level at the mobile station as reception state information.

[0010] In the method of recognizing the current position of a mobile station according to the present invention, a propagation channel between the mobile station and the base station is measured as reception state information using a communication channel with the base station.

[0011] In the method of recognizing the current position of a mobile station according to the present invention, the base station receives and stores the measured or acquired reception state information from the mobile station, and the base station receives the stored reception state information, The present position of the mobile station is determined based on the reception state-position correspondence information.

[0012] In the mobile station current position recognition method according to the present invention, the mobile station receives and stores the reception state-position correspondence information from the base station, and the mobile station measures or obtains the reception state information; The present position of the mobile station is determined based on the stored reception state-position correspondence information.

A base station according to the present invention receives a signal from one or more base stations and communicates with a mobile station having reception state information acquisition means for measuring or acquiring position-dependent reception state information. And receiving status information depending on a position in the communication area of the base station based on a signal from the base station, and pre-stored as receiving state-position correspondence information in association with the position information in the communication area. Storage means, reception means for receiving reception state information at the current position of the mobile station, which is acquired and transmitted by the mobile station, and reception state stored in the storage means
A current position recognizing means for determining a current position of the mobile station based on the position correspondence information and the reception state information obtained by the receiving means is provided.

[0014] The base station according to the present invention includes storage means for storing sector information depending on the position of the base station in the communication area and reception status information including the reception level in association with the position information in the communication area. It is prepared for.

[0015] A base station according to the present invention stores a propagation delay amount depending on a position of a base station in a communication area and reception state information including a multipath environment in association with the position information in the communication area. Means.

[0016] A mobile station according to the present invention, based on a signal from a base station, converts a reception state information depending on a position of the base station in a communication area to a reception state corresponding to the position information in the communication area. Based on the position correspondence information and the reception status information of the mobile station, the base station communicates with a base station equipped with a current position recognition means for determining the current position of the mobile station, and one or more of the base stations Receiving a signal from a station, measuring or acquiring receiving state information, transmitting means for transmitting the receiving state information obtained by the receiving state information obtaining means to the base station, the base station Receiving means for receiving the transmitted current position information of the mobile station, which is determined based on the reception state information, and the current position information received by the receiving means. Is obtained so as to include a storage storing unit.

A mobile station according to the present invention receives a signal from one or a plurality of base stations, and measures or obtains reception state information depending on a position, and a signal from the base station. Storage means for storing reception status information depending on the position of the base station in the communication area in association with the position information in the communication area as reception state-position correspondence information; and It is provided with a current position recognition means for judging its own current position based on the reception state information measured or obtained and the reception state-position correspondence information stored in the storage means.

A mobile station according to the present invention includes a reception state information acquisition unit that receives signals from one or a plurality of base stations and measures or acquires reception state information including sector information and a reception level depending on a position. It is prepared for.

A mobile station according to the present invention includes a reception state information acquisition unit that receives signals from one or a plurality of base stations and measures reception state information including a position-dependent propagation delay amount and a multipath environment. It is prepared for.

[0020] The mobile station according to the present invention is provided with a reception state information acquisition means for measuring the reception level using the broadcast channel of the base station.

The mobile station according to the present invention is provided with a receiving state information acquiring means for measuring the propagation delay amount using a communication channel with the base station.

A current position recognition apparatus for a mobile station according to the present invention includes a mobile station of a CDMA communication system and a base station, wherein the mobile station receives signals from one or a plurality of the base stations. And a reception state information acquisition unit for measuring or acquiring reception state information depending on the position, wherein the base station measures the reception state information which is measured in advance and depends on the position in the communication area, Storage means for storing as reception state-position information in association with information, wherein the base station receives the reception state information obtained by the reception state information acquisition means and transmitted from the mobile station to the base station; The present invention is configured to determine the current position of the mobile station based on the reception state-position correspondence information stored in the means.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 In the mobile station current position recognition method according to Embodiment 1 of the present invention, the CDMA communication system has (1) a feature that a spreading code or a phase differs for each sector, and (2) A function of measuring the reception timing of a channel from each base station to receive communication channels or broadcast channels from a plurality of base stations for soft handover, (3) measuring a desired wave power for cell / sector selection (4) RAKE reception (C
The biggest factor that affects the frequency utilization efficiency of DMA is the strength of the received power. The reflected radio waves and the directly arrived radio waves interfere with each other, and the received power may be weakened. For example, a function of detecting a delayed wave due to multipath for a reception method in which the signals are combined and then added) is used. Then, by using these features and functions, information depending on the current position of the mobile station described below is obtained.

That is, by utilizing the characteristic that the spreading code or phase is different for each sector shown in (1), it is possible to know which sector the channel belongs to by receiving the broadcast channel, It is determined whether or not the mobile station exists in the sector, and the current position of the mobile station is specified (specification of the current position of the mobile station using sector information as an element).

In order to receive communication channels or broadcast channels from a plurality of base stations shown in (2), the function of measuring the reception timing of the channel from each base station is used, and the propagation of the position and area is previously performed. The delay difference is measured, the propagation delay difference of the reception channel of each of the plurality of base stations is calculated from each reception timing, and the calculated propagation delay difference is a position where the propagation delay difference is measured in advance, By determining which propagation delay difference in the area matches the propagation delay difference, the location and area where the mobile station is currently located are identified, and the current location of the mobile station is identified. In this case, the resolution of the reception timing used for the propagation delay measurement differs depending on the chip rate, but is 4,096 Mcps (chip per second).
nd), it is about 7 even if one chip delay can be measured.
A point difference every three meters can be detected, and sufficient resolution can be obtained even when used for current position recognition (identification of the current position of a mobile station using propagation delay as an element).

Also, by utilizing the function of measuring the desired wave power for cell / sector selection shown in (3), the relationship between the level of the desired wave power, the position, and the area is measured and determined in advance. By judging the position and area where the received and measured desired power level matches,
The current position of the mobile station is specified (specifying the current position of the mobile station using the reception level as an element).

Also, by utilizing the function of detecting a delay wave due to multipath for RAKE reception shown in (4), the relationship between the delay profile of the received wave, the position, and the area is measured and found in advance. It is possible to determine the current position of the mobile station by judging where the measured delay profile of the received wave matches the position and region delay profile previously measured and obtained (multipath environment measurement). The identification of the current position of the mobile station having the element as an element).

That is, position-dependent reception state information is measured in advance at all points where the current position of the mobile station is to be recognized, and the reception state information (sector information, propagation delay amount, reception level, multipath environment, etc.) is obtained. ) And a position information correspondence table (reception state-position information) corresponding to the position information of the point. Then, reception is performed using a communication path of one or a plurality of base stations. As a result, the reception state information (sector information, propagation delay amount, reception level, multipath environment) depending on the measured or acquired current position is obtained. Etc.) from the reception status information-
Referring to the position information correspondence table, comprehensively determine information such as the sector information, the propagation delay amount, the reception level, and the multipath environment, and estimate the position of the mobile station with high accuracy without increasing the cost. And recognize.

Hereinafter, a method and apparatus for recognizing the current position of a mobile station according to Embodiment 1 of the present invention and the mobile station and base station thereof will be described in more detail. FIG.
FIG. 2 is a block diagram illustrating a configuration of a base station and a mobile station to which the mobile station current position recognition method according to the first embodiment of the present invention is applied. In the figure, reference numeral 101 denotes a base station to which a CDMA communication system (in the embodiment of the present invention, a broadband CDMA communication system that provides a large processing gain and obtains excellent interference noise resistance characteristics) is used, and 102. Is base station 1
01, an antenna for performing communication by the CDMA communication method between the mobile station and the mobile station; 103, an exchange; and 104, a mobile station to which the CDMA communication method is applied.

Reference numeral 111 denotes a terminal interface unit in the mobile station 104; 112, a radio communication control unit (reception state information acquisition means) which controls various parts of the mobile station 104 and measures and acquires reception state information such as cell information. ), 11
Reference numeral 3 denotes a communication channel coding unit; 114, a baseband modulation / demodulation unit (reception state information acquisition unit) for performing modulation and demodulation specific to the CDMA communication system and detecting the amount of propagation delay, multipath information and the like; , 116 is base station 1
01 is an antenna for performing communication with the CDMA communication system 01 by the CDMA communication system.

Reference numeral 121 denotes a current position recognizing means of the mobile station provided in the base station 101, and 122 denotes a current position recognizing means provided in the mobile station 104. In FIG. Although it is shown that the current position recognizing means is configured in both of the inside of the mobile station 104, the current position recognizing means may be configured in either the base station 101 or the mobile station 104. Reference numeral 131 denotes a storage unit included in the base station 101, which stores a reception state information-position information correspondence table. Reference numeral 132 denotes a storage unit included in the mobile station 104, which stores a reception state information-position information correspondence table. Reference numeral 141 denotes a storage unit provided in the wireless communication control unit 112.

In the mobile station current position recognizing method and the current position recognizing apparatus according to the first embodiment of the present invention, and the mobile station and the base station, the target channels of each measurement amount are the following channels. That is, a communication channel is used for the propagation delay amount. When communication is actually being performed, the delay difference between base stations is measured using the channel, and when communication is not being performed, short-term communication is performed to measure the propagation delay difference between base stations.

As for the reception level, the desired signal power is measured for the broadcast channel. This is because the transmission power control is performed in the communication channel, so that the correlation with the position of the desired wave power is significantly reduced. For multipath environment measurement, a delay profile is measured for a broadcast channel.

FIG. 7 is an explanatory diagram showing the structure of the reception status information-position information correspondence table. In FIG. 7, 151 is sector information, 152 is a propagation delay amount, 153 is a reception level, and 153 is a reception level.
4 is multipath environment information (delay profile), 155
Is the location information of all the locations of the mobile station 104 whose current location is to be recognized corresponding to the sector information 151, the propagation delay amount 152, the reception level 153, the multipath environment information 154, and the like. These sector information 151 and propagation delay amount 15
2, the reception level 153, the multipath environment information 154, and the like are measured in advance by receiving using a communication channel with a base station, receiving a communication channel, and a broadcast channel at all points where the current position is to be recognized.

Next, the reception state information-position information correspondence table will be described. FIG. 2 is an explanatory diagram showing the correspondence between the sector information 151 and the position information 155. In the figure, 1, 2 and 3 are cells, and each cell is composed of six sector sectors. 4 is the fifth sector 2 of cell 2
5 is a range in which the broadcast channel can be received, 5 is a range in which the broadcast channel of the fourth sector 2-4 of the cell 2 can be received, 6
Is a range in which the broadcast channels of the third sector 1-3 of the cell 1 and the sixth sector 3-6 of the cell 3 can both be received. 7 is the third sector 1-3 of cell 1, 4 of sector 1
The first sector 1-4, the first sector 2-1 of cell 2,
Range where all broadcast channels of the second sector 2-2 of the cell 2, the fifth sector 3-5 of the cell 3 and the sixth sector 3-6 of the cell 3 can be received, and 8 is the fifth sector of the cell 2. The range in which both the broadcast channels of 2-5 and the fourth sector 2-4 can be received, and 9 is the fourth sector 1-of the cell 1
4, the fifth sector 1-5 of the cell 1, and the first sector 2-1 of the cell 2 can be both received.

As for the correspondence between the sector information 151 and the position information 155, as shown in FIG. 2, the same set of three or more broadcast channels can be received (for example, range 9), and the same set of two broadcast channels can be received. Range (eg range 6,
Range 8) It is divided into a range (for example, range 4 and range 5) in which one broadcast channel can be received, and is associated with the position information 155. In FIG. 7, a portion indicated by reference numeral 211 is a reception state information-position information correspondence table for a range in which one broadcast channel can be received, and a reception portion in a range indicated by reference numeral 212 can receive two sets of broadcast channels. A state information-position information correspondence table, and a reception state information-position information correspondence table regarding a range in which a set of three broadcast channels having the same reference numeral 213 can be received are shown as an example.

Next, the correspondence between the propagation delay amount 152 and the position information 155 in the reception state information-position information correspondence table will be described. FIG. 3 is an explanatory diagram showing the correspondence between the propagation delay difference and the position information between base stations when communication channels can be received from three or more base stations. In the figure, 11 is an estimated position of the mobile station 104, 12 is a propagation path of a direct wave having a distance a from the base station of the cell 1 to the mobile station 104, 13
Is a propagation path of a direct wave having a distance b from the base station of the cell 2 to the mobile station 104, and 14 is a propagation path of a direct wave having a distance c from the base station of the cell 3 to the mobile station 104.

In preparing the reception state information-position information correspondence table, the correspondence between the propagation delay difference between base stations and the position information was first measured at all points for which the current position is to be recognized. A distance difference between any two of the three or more base stations and the point is derived from the propagation delay amount between the one or more base stations.

If there is no obstacle in the communication path and the condition is ideal, the difference between the distance between the point and the arbitrary two base stations is the difference between the propagation delay between the point and each of the base stations and the chip. As shown in FIG. 3, for the estimated position 11 of the mobile station 104, the propagation delay difference between the base station of the cell 1 and the base station of the cell 2 × (chip rate) Difference | ab | between the estimated position 11 and the base station of the cell 1 and the distance between the estimated position 11 and the base station of the cell 2
Is required.

Similarly, the estimated position 11 and the cell 2
And the difference | bc | between the estimated position 11 and the base station of the cell 3, similarly, the distance between the estimated position 11 and the base station of the cell 3, and the estimated position 11 And cell 1
The difference | ca | in the distance between the base stations is determined. Thus, the estimated position 11, which is the position where the mobile station 104 is located, is uniquely estimated. The position information about the uniquely estimated position 11 is preset in the reception state information-position information correspondence table as the position information 155 obtained corresponding to the propagation delay amount at that point.

FIG. 4 is an explanatory diagram showing the correspondence between the propagation delay difference and the position information between base stations when a communication channel can be received from two base stations. In the figure, 21 is the mobile station 1
04, a first location candidate of 22; 22 is a second location candidate of the mobile station 104; 23 is a propagation path of a direct wave having a distance d from the base station of the cell 1 to the first location candidate 21 of the mobile station 104; 24 is a propagation path of a direct wave having a distance d from the base station of the cell 1 to the second candidate 22 for the mobile station 104;
25 is a propagation path of a direct wave having a distance e from the base station of the cell 2 to the first candidate 21 of the mobile station 104, and 26 is a second candidate 2 of the mobile station 104 from the base station of the cell 2.
It is a propagation path of a direct wave having a distance e to 2.

When the communication channel can be received from the two base stations as described above, the difference in propagation delay between the base stations is calculated as follows.
As described above, the difference in distance between the mobile station 104 and the base station (FIG. 4)
In this case, | ed |) is obtained. From this, in the reception state information-position information correspondence table, the candidates for the existence position of the mobile station 104 are narrowed down to two, the first existence position candidate 21 and the second existence position candidate 22. Can be

FIG. 5 shows a case where a communication channel can be received from two base stations, and in particular, a case where two candidate mobile station locations obtained from the propagation delay difference between base stations exist in the same cell area. FIG. 6 is an explanatory diagram showing a correspondence relationship between propagation delay difference and position information between base stations. In the figure, 31 is the mobile station 1
04 is a first location candidate of the mobile station 104, 32 is a second location candidate of the mobile station 104, 33 is a propagation path of a direct wave having a distance f from the base station of the cell 1 to the first location candidate 31 of the mobile station 104, 34 is a propagation path of a direct wave having a distance f from the base station of the cell 1 to the second candidate for the second location 32 of the mobile station 104;
35 is a propagation path of a direct wave having a distance g from the base station of the cell 2 to the first location candidate 31 of the mobile station 104, and 36 is a second location candidate 3 of the mobile station 104 from the base station of the cell 2
This is a propagation path of a direct wave having a distance g up to 2.

When the communication channel can be received from the two base stations as described above, from the measured propagation delay difference between the base stations,
As described above, the difference in distance between the mobile station 104 and the base station (FIG. 5)
In this case, | gf |) is obtained, and the reception state information-position information correspondence table narrows down the candidates for the current position of the mobile station 104 to two, the first existence position candidate 31 and the second existence position candidate 32. Can be Further, when the first existence position candidate 31 and the second existence position candidate 32 are in the same cell area, the first existence position candidate 31 is obtained from the position information of the range estimated from the sector information described in FIG. And any one of the second existence position candidates 32. In addition, for any of the identified location candidates, the mobile station 1
The reception level and the delay profile in the reception state information-position information correspondence table are referred to based on the reception level and the delay profile measured in step 04, and the validity is checked from the relationship between the two.

When a communication channel can be received from two base stations as described above, the difference between the distance between the mobile station 104 and the base station from the measured propagation delay difference between the base stations (in FIG. 4, | ed
, | Gf |) in FIG. 5, and from the reception state information-position information correspondence table, the current position candidate of the mobile station 104 is determined as the first position candidate 21 and the second position candidate 21 in FIG. 2 narrows down to two of the existing position candidates 22, and in the case of FIG.
It is possible to narrow down to two of the existing position candidates 31 and the second existing position candidates 32. Further, as shown in FIG. 5, when the first existence position candidate 31 and the second existence position candidate 32 are in the same cell area, the position information of the range estimated from the sector information described in FIG. From the first location candidate 31 and the second location candidate 32, and the reception level 153 of the reception state information-position information correspondence table based on the reception level and the delay profile measured at the mobile station 104. By referring to the delay profile 154, the validity of the current position estimation of the mobile station 104 is confirmed.

In the reception status information-position information correspondence table of FIG. 7, the reception level 153 is a value calculated from the measured data or the distance from the base station (the reception level is inversely proportional to the square of the distance from the base station). The reception level calculation result calculated from the above) or the value calculated from the distance to the base station in consideration of actual measurement data is used. Delay profile DP measured for multipath environment
Use F. In Embodiment 1 of the present invention, it is assumed that the reception state information-position information correspondence table is reported from the nearest base station to mobile station 104 whose current position is to be recognized.

As described above, in the reception state information-position information correspondence table shown in FIG. 7, the propagation delay amount 152 and the position information 1 are set for the range in which the communication channels of three or more base stations can be received.
55 correspond one-to-one, and within a range in which a communication channel can be received from two base stations, 2
Two types of existence position information corresponding to one existence position candidate correspond. Also, at a point where direct waves are hard to be observed, such as in an urban area, this is corrected based on the actually measured data.

Next, the current position of the mobile station 104 is recognized using the reception state information (sector information, propagation delay amount, reception level, multipath environment, etc.) measured by the mobile station and the reception state information-position information correspondence table. The operation of the means 122 will be described with reference to the flowchart shown in FIG.

The sector information 151, the propagation delay amount 152, the reception level 153, the multipath environment information 154, etc. of the reception status information-position information correspondence table shown in FIG. The reception state information-position information correspondence table is measured in advance and set in the reception state information-position information correspondence table, and the reception state information-position information correspondence table is transmitted from the base station to the mobile station 104 that attempts to recognize the current position, and stored in the storage means. 132.

The current position recognizing means 122 of the mobile station 104 performs a standby process for the reception of the broadcast channel (step ST1). As a result, when the broadcast channel is received, the mobile station 104 is located on the basis of the sector information. The estimation is performed for the range shown in FIG. Further, it is determined how many broadcast channels of the base stations are receivable, and if the broadcast signals can be received from the three base stations, the spreading information detected from the broadcast channels of the three base stations and the sector information and the sector information obtained from the phase thereof are obtained. From the correspondence of the position information, the range where the mobile station 104 exists (for example, range 9) is estimated (step ST2, step ST3).

Next, the existence position of the mobile station 104 is uniquely estimated according to the explanation of FIG. 3 based on the propagation delay between base stations measured by the communication channels with the three base stations (step ST4). .

In consideration of the possibility of performing calculation from a delayed wave due to multipath and the effect of fading fluctuation,
Regarding the measured reception level and delay profile, the reception level 153 of the reception state information-position information correspondence table shown in FIG.
And the multipath environment information (delay profile) 154, and the reception level 15 of the reception state information-position information correspondence table.
3 and the multipath environment information 154, the process proceeds to step ST8 to avoid erroneous estimation (step ST5).

On the other hand, if it is determined in step ST3 that a broadcast channel can be received from two base stations,
From the correspondence between the sector information and the position information, the range (for example, range 6 and range 8) where the mobile station 104 is present is estimated based on the spread code detected from the plurality of broadcast channels and the phase thereof.

Next, based on the propagation delay between the base stations measured from the communication channels with the two base stations, as described with reference to FIGS.
Or, the position candidates 31, 32 are estimated (step S
T6).

Next, it is determined whether or not the two existing location candidates obtained from the propagation delay between base stations are present in the same area (step ST7). In step ST12, the location of the mobile station 104 is estimated from the reception status information-position information correspondence table indicated by reference numeral 212 in FIG.

In step ST12, the range is estimated from the sector information in step ST2 (in this case,
Since the two sector information are obtained, the mobile station 104
For example, the range 6, the range 8 and the like are estimated as the existing position), and the existing position candidate obtained from the position information of the range 6 and the range 8 and the measured inter-base station propagation delay amount. Is identified as one of the first existing position candidate 21 and the second existing position candidate 22, and the existing position of the mobile station 104 is estimated.

The measured reception level and delay profile are shown in the reception status information 212 shown in FIG.
By referring to the reception level 153 and the multipath environment information 154 of the position information correspondence table, avoid erroneous estimation (step ST
5).

As shown in FIG. 5, if both of the location candidates obtained from the inter-base-station propagation delay are present in the same area, the process proceeds from step ST7 to step ST8, where the measured reception level and delay are measured. With reference to the profile, the reception level 153 and the multipath environment information 154 of the reception state information-position information correspondence table indicated by reference numeral 212 in FIG. 7 are referred to (steps ST8 and ST9), and the location of the mobile station 104 is further specified. Determine (Step ST1)
0). In the reception state information-position information correspondence table indicated by reference numeral 212 in FIG. 7, two existence position candidates having the same propagation delay amount D10 are estimated as L10 and L11 as the position information 155. Whether the position is a position candidate is determined based on the measured reception level and delay profile as a condition.
53 and the multipath environment information 154, and specify one of them.

On the other hand, if it is determined in step ST3 that the broadcast channel can be received from one base station,
Based on the spreading code and its phase detected from the one broadcast channel, the sector information is obtained, and the area where the mobile station 104 is located is estimated based on the obtained sector information.

Next, the reception level measured by the mobile station 104 is referred to the reception level 153 of the reception state information-position information correspondence table indicated by reference numeral 211 in FIG. Further, the estimated existence area is further limited (step ST8). Note that the estimated existence area in this case is an area corresponding to the reception level within the same distance range from the base station in a sector area spread fan-shaped around the base station.

Further, based on the delay profile measured by the mobile station 104, the multi-path environment information 154 of the reception state information-position information correspondence table is referred to, and estimated from the position information 155 corresponding to the multi-path environment information. The validity of the existence area is checked and the existence area is limited, and the existence position is determined (steps ST9 and ST10).

If the delay profile measured in step ST9 is significantly different from the multipath environment information 154 in the reception state information-position information correspondence table, the existence area is further limited to determine the existence position. In step ST8, it is not possible to perform the operation in the area estimated from the measured reception level (in the sector area spread fan-shaped around the base station, the reception level within the same distance range from the base station). The corresponding area is estimated as an existing area (step ST11).

As described above, according to the first embodiment of the present invention, the sector information 15 obtained by measuring in advance all points for which the mobile station 104 is to recognize the current position is obtained.
1, the propagation delay amount 152, the reception level 153, the multipath environment information 154, and the position information of each point corresponding to the information are acquired as a reception state information-position information correspondence table, and the mobile station 104 Based on the sector information, propagation delay amount, reception level, multipath environment information, etc. obtained by the measurement, the sector information 151, propagation delay amount 152, reception level 153, The consistency is comprehensively determined with reference to the path environment information 154 and the like. Then, the position information 155 corresponding to the sector information 151, the propagation delay amount 152, the reception level 153, the multipath environment information 154, etc. of the reception status information-position information correspondence table when it is determined to be consistent and equivalent is The mobile station 104 estimates the current position of the mobile station 104. As a result, the mobile station 104 estimates the position of the mobile station 104 with high accuracy without adding hardware such as a GPS receiver and without increasing the cost. It has a recognizable effect.

Embodiment 2 A method and apparatus for recognizing a current position of a mobile station according to a second embodiment of the present invention, and a mobile station and a base station thereof are used as the current position specifying element of the mobile station in the first embodiment of the present invention. The broadcast channel is used instead of the communication channel in the measurement of the inter-propagation delay difference. When broadcast channels cannot be received simultaneously in time, the reception timing of a certain base station is stored in a frame cycle, so that it can be compared with the reception timing of the broadcast channel of the next base station.

As described above, according to the second embodiment of the present invention, it is necessary to store the reception timing, but without opening a communication channel for recognizing the current position, the mobile station can perform its own operation with high accuracy. There is an effect that the position can be estimated and recognized.

Embodiment 3 The method and apparatus for recognizing the current position of a mobile station according to Embodiment 1 of the present invention, the mobile station and the base station receive the reception state information measured by the mobile station 104 and the reception state information acquired from the base station 101. −
Although the mobile station 104 performs the current position recognition using the position information correspondence table, according to the third embodiment of the present invention, the base station 101 performs the current position recognition of the mobile station 104. .

That is, the base station 101 does not report the reception state information-position information correspondence table and holds the table inside the base station.
The mobile station 104 does not store the reception state information-position information correspondence table. The mobile station 104 uses the control channel if the measured reception status information is being communicated, and opens a new radio channel if it is not communicating, thereby making the base station 10
1 to the base station via the receiving means. Base station 1
In step 01, the current position of the mobile station 104 is estimated by the current position recognition means 121 based on this.

The result of estimating the current position of the mobile station 104 is based on the control channel if communication is being performed between the base station 101 and the mobile station 104, and the newly opened radio channel if not communicating. Is transmitted to the mobile station 104 via the transmitting means of the base station 101 and the receiving means of the mobile station. Then, the mobile station 104 receives the transmitted estimation result of the current position and stores it in the storage unit 141 of the wireless communication control unit 112 shown in FIG. 1, and the mobile station 104 recognizes its own current position.

Therefore, according to Embodiment 3 of the present invention, the base station recognizes the current location of the mobile station, so that the base station does not need to notify the mobile station of the reception status information-position information correspondence table. The increase in communication capacity can be suppressed, and
Since the mobile station does not need to store the reception state information-position information correspondence table, the mobile station can be downsized.

In creating the reception status information-position information correspondence table, the sector information 151, the propagation delay amount 152,
Since the reception level 153 and the multipath environment information 154 are all obtained by measuring information used for CDMA communication, a function such as a transmitting means for outputting the measured data to the base station is provided by the mobile station. If the base station is provided with receiving means for receiving the data, the mobile station only needs to pass through the measurement area while communicating with the base station, and the base station receives the reception state information. -There is an effect that data necessary for creating the position information correspondence table can be easily obtained.

[0071]

According to the present invention, in a CDMA communication system performed between a base station and a mobile station, signals from one or a plurality of the base stations are received, and reception state information depending on the position is transmitted. Measured or obtained, the measured or obtained reception state information, and the reception state information based on the signal from the base station are measured in advance at a plurality of points in the communication area of the base station, and the position of each measurement point is measured. Since the current position of the mobile station is determined on the basis of the reception state-position correspondence information stored in association with the information, the mobile station can use the mobile station without adding new hardware such as a GPS receiver. The current position of the mobile station can be determined based on the measured or acquired reception state information and the reception state-position correspondence information, and by adding hardware such as a GPS receiver. The can avoid an increase in cost of the mobile station and said reception state are stored - from the position corresponding information becomes accurate, there is an effect that can recognize the current position of the mobile station with high accuracy.

According to the present invention, since the reception status information includes the sector information and the reception level, the sector information measured or acquired by the mobile station can be obtained without adding new hardware such as a GPS receiver. The current position of the mobile station can be determined based on the reception state information including the reception level and the reception state-position correspondence information, and it is possible to avoid an increase in cost due to the addition of hardware such as a GPS receiver. There is an effect that the current position can be recognized with high accuracy.

According to the present invention, the reception state information includes the amount of propagation delay and the multipath environment, so that the propagation measured or acquired by the mobile station can be performed without adding new hardware such as a GPS receiver. The amount of delay, the current position of the mobile station can be determined based on the reception state information including the multipath environment and the reception state-position correspondence information, and an increase in cost due to the addition of hardware such as a GPS receiver can be avoided. There is an effect that the current position of the mobile station can be recognized with high accuracy.

According to the present invention, the reception level at the mobile station is measured as the reception state information using the broadcast channel of the base station, so that the measured reception level has a high correlation with the position, and the GPS It is possible to avoid an increase in cost due to the addition of new hardware such as a receiver, and it is possible to recognize the current position of the mobile station with high accuracy.

According to the present invention, the amount of propagation delay between the base station and the base station is measured as reception state information using the communication channel with the base station. Measurement can be performed with high accuracy, an increase in cost due to the addition of new hardware can be avoided, and the present position of the mobile station can be recognized with high accuracy.

According to the present invention, the measured or acquired reception state information is received and stored by the base station from the mobile station, and at the base station, the stored reception state information, reception state-position correspondence information, Based on the above, the current position of the mobile station is determined, so that there is no need to notify the reception state-position correspondence information from the base station to the mobile station, and the communication capacity between the base station and the mobile station. In addition, since there is no need to store reception state-position correspondence information in the mobile station, the mobile station can be downsized.

According to the present invention, the reception state-position correspondence information is received and stored by the mobile station from the base station, and the reception state information measured or obtained by the mobile station is stored in the reception state-position correspondence information. Since the current position of the mobile station is determined based on the information, even if hardware such as a GPS receiver is not added to the mobile station, the measured or acquired reception state information and the received There is an effect that the current position of the own station can be recognized with high accuracy using the reception state-position correspondence information.

According to the present invention, the reception state information depending on the position of the base station in the communication area based on the signal from the base station is made to correspond to the position information in the communication area as reception state-position correspondence information. Pre-stored storage means and position dependent reception by receiving signals from one or more base stations measured or obtained by the mobile station reception state information obtaining means and transmitted from said mobile station Receiving means for receiving state information; current position recognition for determining a current position of the mobile station based on reception state-position correspondence information stored in the storage means and reception state information obtained by the receiving means; And means are configured to be provided in a base station communicating with the mobile station,
There is no need to notify the reception state-position correspondence information from the base station to the mobile station, and it is possible to reduce the communication capacity between the base station and the mobile station. Since there is no need to store data in the station, the size of the mobile station can be reduced, the cost of the mobile station can be prevented from increasing due to the addition of new hardware, and the current position of the mobile station can be accurately determined. Has the effect of recognizing

According to the present invention, the storage means for storing the sector information depending on the position of the base station in the communication area and the reception status information including the reception level in association with the position information in the communication area. Was configured to provide
There is no need to report the reception state-position correspondence information including the sector information and the reception level from the base station to the mobile station, and the communication capacity between the base station and the mobile station can be reduced. Since it is not necessary to store reception state-position correspondence information including a reception level in the mobile station, the size of the mobile station can be reduced, and the cost of the mobile station can be reduced by adding new hardware. It is possible to avoid an increase and to recognize the current position of the mobile station with high accuracy.

According to the present invention, the storage means for storing the propagation delay amount depending on the position of the base station in the communication area and the reception status information including the multipath environment in association with the position information in the communication area. Since the base station is configured to be provided, there is no need to notify the mobile station of the reception state-position correspondence information including the propagation delay amount and the multipath environment, and the communication between the base station and the mobile station. Since the capacity can be reduced, and the propagation delay amount, the reception state-position correspondence information including the multipath environment does not need to be stored in the mobile station, the mobile station can be downsized.
It is possible to avoid an increase in the cost of the mobile station due to the addition of new hardware, and it is possible to recognize the current position of the mobile station with high accuracy.

According to the present invention, the reception state information depending on the position of the base station in the communication area based on the signal from the base station is converted into the reception state-position correspondence information corresponding to the position information in the communication area. And, based on the reception state information of the mobile station, a mobile station that communicates with a base station including a current position recognition unit that determines the current position of the mobile station,
Reception state information acquisition means for receiving signals from one or more base stations and measuring or acquiring reception state information;
The transmitting means for transmitting the reception state information obtained by the reception state information obtaining means to the base station, and the current position determined by the current position recognition means of the base station based on the reception state information and transmitted. Since the receiving unit receives the current position information of the station and the storage unit that stores the current position information received by the receiving unit, the current position of the mobile station determined by the base station is received. Since the mobile station can recognize its current position, and it is not necessary to store reception state-position correspondence information in the mobile station,
The size of the mobile station can be reduced, an increase in the cost of the mobile station due to the addition of new hardware can be avoided, and the present position of the mobile station can be recognized with high accuracy.

According to the present invention, receiving state information acquiring means for receiving signals from one or more base stations and measuring or acquiring position-dependent receiving state information, and based on signals from the base stations Storage means for storing reception state information depending on the position of the base station in the communication area, as reception state-position correspondence information in association with the position information in the communication area, and measurement or reception by the reception state information acquisition means. Since the mobile station is provided with current position identification means for determining its own current position based on the obtained reception state information and the reception state-position correspondence information stored in the storage means, the base station Since the station does not need to store the reception state-position correspondence information and recognizes its current position on the mobile station side, the base station and the base station for the current position recognition of the mobile station are used. Since the communication capacity between the base station and the base station can be reduced, and it is not necessary to store the reception state-position correspondence information in the base station, the size of the base station can be reduced, and new hardware can be added. Therefore, it is possible to avoid an increase in the cost of the base station, and to recognize the current position of the mobile station with high accuracy.

According to the present invention, the reception state information acquisition means for receiving signals from one or a plurality of base stations and measuring or acquiring reception state information including position-dependent sector information and reception level is provided for the mobile station. , The sector information for current position recognition, the reception state information including the reception level can be measured on the mobile station side with high accuracy, and the movement by adding new hardware can be performed. This has the effect of avoiding an increase in the cost of the station and enabling the current position of the mobile station to be recognized with high accuracy.

According to the present invention, a mobile station is provided with a reception state information acquisition means for receiving a signal from one or a plurality of base stations and measuring the reception state information including the propagation delay depending on the position and the multipath environment. , The propagation delay amount for the current position recognition, the reception state information including the multipath environment can be measured with high accuracy on the mobile station side, and by adding new hardware It is possible to avoid an increase in the cost of the mobile station, and it is possible to recognize the current position of the mobile station with high accuracy.

According to the present invention, the mobile station is provided with the reception state information acquisition means for measuring the reception level using the broadcast channel of the base station. The measured reception level has a high correlation with the position, so that an increase in the cost of the mobile station due to the addition of new hardware such as a GPS receiver can be avoided, and the current position of the mobile station can be recognized with high accuracy. There is an effect that can be done.

According to the present invention, since the mobile station is provided with the reception state information acquisition means for measuring the propagation delay using the communication channel with the base station, the propagation delay for the current position recognition is provided. Measurement can be performed with high accuracy on the mobile station side, an increase in the cost of the mobile station due to the addition of new hardware can be avoided, and the present position of the mobile station can be recognized with high accuracy. .

According to the present invention, a mobile station of the CDMA communication system receives a signal from one or a plurality of the base stations, and includes a reception state information acquiring means for measuring or acquiring position-dependent reception state information. , The base station of the CDMA communication system includes storage means for storing the reception state information measured in advance and depending on the position in the communication area as reception state-position correspondence information in association with the position information in the communication area, The base station, the reception state information obtained by the reception state information acquisition means and transmitted from the mobile station to the base station, and the reception state stored in the storage means-
Since the present position of the mobile station is determined based on the position correspondence information, the size of the mobile station can be reduced, and the cost of the mobile station by adding new hardware can be improved. Thus, there is an effect that the current position of the mobile station can be recognized with high accuracy.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a base station and a mobile station to which a mobile station current position recognition method according to Embodiment 1 of the present invention is applied.

FIG. 2 is an explanatory diagram showing a current position recognition method and a current position recognition device of a mobile station according to Embodiment 1 of the present invention, and a correspondence relationship between sector information and position information applied to the mobile station and the base station.

FIG. 3 is a diagram showing a method and apparatus for recognizing a current position of a mobile station according to the first embodiment of the present invention, and a method for recognizing a current position between base stations when the mobile station and the base station can receive communication channels from three or more base stations. It is explanatory drawing which shows the correspondence of a propagation delay difference and positional information.

FIG. 4 is a diagram illustrating a current position recognition method and a current position recognition device of a mobile station according to Embodiment 1 of the present invention, and a propagation delay between base stations when the mobile station and the base station can receive communication channels from two base stations. It is explanatory drawing which shows the correspondence of difference / position information.

FIG. 5 is a method for recognizing a current position of a mobile station and a current position recognizing device of the first embodiment of the present invention, and in a case where two mobile station location candidates are present in the same cell area in the mobile station and the base station FIG. 6 is an explanatory diagram showing a correspondence relationship between propagation delay difference and position information between base stations.

FIG. 6 is a flowchart showing a method of recognizing a current position of a mobile station and a current position recognizing device according to the first embodiment of the present invention, and a mobile station current position recognizing operation of the mobile station and the base station;

FIG. 7 is an explanatory diagram showing a current position recognizing method and a current position recognizing device of the mobile station according to the first embodiment of the present invention, and a reception status information-position information correspondence table in the mobile station and the base station.

[Explanation of symbols]

Reference Signs List 101 base station, 104 mobile station, 112 wireless communication control unit (reception state information acquisition unit), 114 baseband modulation / demodulation unit (reception state information acquisition unit), 121, 122
Current position recognition means, 131, 132 storage means, 141
Storage unit, step ST1 to step ST9 Current position recognition step.

Continued on front page F term (reference) 5J062 AA08 AA09 CC18 5K067 AA21 AA41 AA42 BB02 BB36 CC10 DD43 DD44 EE02 EE10 EE24 EE46 FF02 FF16 HH23 JJ52 JJ53 JJ54 KK15

Claims (17)

[Claims] 1. CDM performed between a base station and a mobile station
In the A communication system, receiving signals from one or more base stations and measuring or acquiring position-dependent reception state information, and measuring or acquiring in the reception state information acquisition step The reception state information and the reception state information in which the reception state information based on the signal from the base station is measured in advance at a plurality of points in the communication area of the base station, and is stored in association with the position information of each measurement point. A current position recognition step of determining the current position of the mobile station based on the position correspondence information. 2. The method according to claim 1, wherein the reception status information includes sector information and a reception level. 3. The method according to claim 2, wherein the reception state information includes a propagation delay amount and a multipath environment. 4. The method for recognizing a current position of a mobile station according to claim 2, wherein, in the receiving state information obtaining step, a reception level at the mobile station is measured using a broadcast channel of the base station. 5. The current position of a mobile station according to claim 3, wherein in the receiving state information obtaining step, a propagation delay amount between the mobile station and the base station is measured using a communication channel with the base station. Recognition method. 6. A current position recognizing step, wherein the receiving state information measured or acquired in the receiving state information acquiring step is received from the mobile station and stored, and the base station stores the received state stored in the storing step. The method according to claim 1, further comprising: determining a current position of the mobile station based on the state information and the reception state-position correspondence information. 7. A current position recognizing step, comprising: a storing step of receiving and storing reception state-position correspondence information from a base station; and receiving state information measured or obtained in the reception state information obtaining step in the mobile station; 2. The method according to claim 1, further comprising: determining a current position of the mobile station based on the reception state-position correspondence information stored in the storage step. 8. A mobile station that receives a signal from one or a plurality of base stations and communicates with a mobile station including reception state information acquiring means for measuring or acquiring position-dependent reception state information. Storage means for preliminarily storing reception state information based on a signal from a station, the reception state information depending on the position in the communication area, corresponding to the position information in the communication area, as reception state-position correspondence information; Receiving means for receiving reception state information at the current position of the mobile station, which is obtained and transmitted by a station; reception state-position correspondence information stored in the storage means;
Based on the reception status information obtained by the receiving means,
C comprising a current position recognizing means for determining the current position.
Base station of the DMA communication system. 9. The storage unit stores sector information depending on the position of the base station in the communication area and reception state information including the reception level in association with the position information in the communication area. Claim 8
Base station as described. 10. The storage means stores the propagation delay amount depending on the position of the base station in the communication area and the reception state information including the multipath environment in correspondence with the position information in the communication area. The base station according to claim 9, wherein 11. Reception state-position correspondence information corresponding to position information in the communication area based on a signal from the base station, the reception state information being dependent on the position of the base station in the communication area; For communicating with a base station provided with a current position recognizing means for determining a current position of the mobile station based on reception state information of the station, and receiving signals from one or more base stations. Receiving state information acquiring means for measuring or acquiring receiving state information, transmitting means for transmitting the receiving state information obtained by the receiving state information acquiring means to the base station, and the current position recognizing means of the base station, A receiving unit that receives the current position information of the mobile station determined and transmitted based on the reception state information; and a storage unit that stores the current position information received by the receiving unit. The mobile station of the CDMA communication system. 12. A receiving state information acquiring means for receiving a signal from one or more base stations and measuring or acquiring position-dependent receiving state information, and said base station based on a signal from said base station. Storage means for storing reception state information depending on the position in the communication area as reception state-position correspondence information in association with the position information in the communication area; and the reception measured or acquired by the reception state information acquisition means. A mobile station of a CDMA communication system, comprising: current position identification means for determining its own current position based on state information and reception state-position correspondence information stored in the storage means. 13. The reception status information acquisition means receives a signal from one or a plurality of base stations, and measures or acquires reception status information including position-dependent sector information and a reception level. The mobile station according to claim 12. 14. The reception state information acquiring means receives a signal from one or a plurality of base stations and measures reception state information including a propagation delay amount depending on a position and a multipath environment. The mobile station according to claim 13. 15. The mobile station according to claim 13, wherein the reception level is measured using a broadcast channel of the base station. 16. The mobile station according to claim 14, wherein the propagation delay amount is measured using a communication channel with the base station. 17. A mobile communication system comprising a mobile station and a base station in a CDMA communication system, wherein the mobile station receives signals from one or more base stations and measures position-dependent reception state information. Or a reception state information acquisition means for acquiring, the base station, the reception state information measured in advance and dependent on the position in the communication area, is associated with the position information in the communication area as reception state-position correspondence information The base station includes: the reception state information obtained by the reception state information acquisition unit and transmitted from the mobile station to the base station; and the reception state-position stored in the storage unit. An apparatus for recognizing a current position of a mobile station, wherein the current position of the mobile station is determined based on correspondence information.