WO2021192199A1 - Wireless device, server, and wireless communication method - Google Patents

Abstract

The present invention makes it possible to properly manage the position of a wireless device. This wireless device comprises a plurality of antennas. The wireless device further comprises: a control unit which controls turning on and off of each of the plurality of antennas to switch a plurality of antenna patterns having different antennas that are turned on among the plurality of antennas; and a communication unit which, in each of the plurality of antenna patterns, performs reception of a downlink reference signal used for measuring measurement information for estimating the position of the wireless device, or transmission of an uplink reference signal used for measuring the measurement information.

Description

Wireless devices, servers and wireless communication methods

The present invention relates to a wireless device, a server and a wireless communication method.

3GPP (Third Generation Partnership Project), an international standardization organization, has established LTE-Advanced as the 4th generation (Fourth Generation: 4G) radio access technology (RAT) (for example, Non-Patent Document 1). .. In recent years, the operation of LTE-Advanced compliant wireless communication networks has also been promoted.

As one of such wireless communication networks, for example, a cell having a coverage of several hundred meters to several tens of kilometers (hereinafter, also referred to as a macro cell) and one or more cells having a coverage smaller than that of the macro cell (hereinafter, small). There is a configuration using (also called a cell). Such a configuration in which a plurality of cells having different coverages are linked is also called a heterogeneous network (HetNet).

Wireless devices that form cells (for example, small cells) have become smaller in recent years, making them easier to install, remove, and carry. At present, the position information indicating the position of such a wireless device is measured by a person of a telecommunications carrier at the installation location of the wireless device and registered in the server. Therefore, the location information may be erroneously registered. In addition, the wireless device may be moved by a user or the like to a position different from the position indicated by the position information.

The present invention has been made in view of such circumstances, and one of the objects of the present invention is to provide a wireless device, a server, and a wireless communication method that can appropriately manage the position of the wireless device.

The wireless device according to one aspect of the present invention is a wireless device including a plurality of antennas, and the antenna that is turned on among the plurality of antennas by controlling the on or off of each of the plurality of antennas. The control unit that switches between a plurality of different antenna patterns and each of the plurality of antenna patterns are used for receiving a downlink reference signal used for measuring measurement information for position estimation of the wireless device, or for measuring the measurement information. It is provided with a communication unit that transmits an uplink reference signal.

The server according to another aspect of the present invention is a server that estimates the position of a wireless device provided with a plurality of antennas, and receives signals from each of a plurality of antenna patterns in which the antenna to be turned on is different among the plurality of antennas. A communication unit that receives measurement information measured using the downlink reference signal or measurement information measured using the uplink reference signal transmitted in each of the plurality of antenna patterns, and the plurality of antennas. It includes an estimation unit that estimates the position of the radio device based on the measurement information about at least one of the patterns.

The wireless communication method according to another aspect of the present invention is a wireless communication method for estimating the position of a wireless device including a plurality of antennas, and the wireless device controls on or off of each of the plurality of antennas. Then, the step of switching a plurality of antenna patterns in which the antennas to be turned on are different among the plurality of antennas and the downlink used for measuring the measurement information for position estimation of the wireless device in each of the plurality of antenna patterns. A wireless communication method including a step of receiving a reference signal or transmitting an uplink reference signal used for measuring the measurement information.

According to the present invention, the position of the wireless device can be appropriately managed.

It is a figure which shows the outline of the wireless communication system which concerns on this embodiment. It is a figure which shows an example of the position estimation of the downlink base which concerns on this embodiment. It is a figure which shows an example of the position estimation of the uplink base which concerns on this embodiment. 4A and 4B are diagrams showing an example of a propagation path for each antenna pattern according to the present embodiment. It is a figure which shows an example of the position estimation of the downlink base using a plurality of antenna patterns which concerns on this embodiment. It is a figure which shows an example of the position estimation of the uplink base using a plurality of antenna patterns which concerns on this embodiment. It is a figure which shows an example of the plurality of antenna patterns which concerns on this embodiment. It is a figure which shows an example of the hardware composition of each apparatus in the wireless communication system which concerns on this embodiment. It is a figure which shows an example of the functional block composition of the small cell base station which concerns on this embodiment. It is a figure which shows an example of the functional block composition of the macro cell base station which concerns on this embodiment. It is a figure which shows an example of the functional block composition of the location server which concerns on this embodiment. It is a figure which shows an example of the position estimation operation of the downlink base which concerns on this embodiment. It is a figure which shows an example of the position estimation operation of the uplink base which concerns on this embodiment.

An embodiment of the present invention will be described with reference to the accompanying drawings. In each figure, those having the same reference numerals may have the same or similar configurations.

(Overview of wireless communication system)
FIG. 1 is a diagram showing an outline of a wireless communication system according to the present embodiment. As shown in FIG. 1, the wireless communication system 1 may include small cell base stations 10A and 10B, macrocell base stations 20A to 20C, a core network 30, a location server 40, and terminals 50A and 50B. ..

The small cell base stations 10A and 10B are wireless devices that form a cell (for example, a small cell). Small cells are cells that have smaller coverage than macro cells. The small cell may be called, for example, a pico cell, a femto cell, a relay cell, or the like. Further, since the small cell base stations 10A and 10B have lower power than the macro cell base stations 20A to 20C, they may be called low-power nodes.

For example, the small cell base station 10A is a relay device between the macro cell base station 20A and the terminal 50A. The relay device is also called a relay node (RN), UE-Relay, or the like. The small cell base station 10A communicates with the terminal 50A via the access link L1 and communicates with the macrocell base station 20A via the backhaul link L2. The small cell base station 10A is connected to the core network 30 via the macro cell base station 20A. As shown in FIG. 1, the access link L1 and the backhaul link L2 may be wireless links.

The small cell base station 10A is an RN (Layer 2RN) that performs layer 2 or lower processing (for example, processing of RadioLinkControl (RLC) layer, MediumAccessControl (MAC) layer, Physical (PHY) layer, etc.). It may be an RN (Layer 3RN) that performs processing of layer 3 or lower (for example, processing of RadioResourceControl (RRC) layer, RLC layer, MAC layer, PHY layer, etc.), or it may be a simple repeater. There may be.

The layer 2RN and the layer 3RN may perform demodulation, decoding, error correction, etc. on the downlink signal (downlink signal) received from the macrocell base station 20A or the uplink signal (uplink signal) received from the terminal 50A, respectively. The layer 2RN and the layer 3RN may recode and modulate the downlink or uplink signal and transmit it to the terminal 50A or to the macrocell base station 20A.

On the other hand, the small cell base station 10B is a kind of base station, for example, eNodeB (eNB), pico eNB, Home eNB (HeNB), gNodeB (gNB), DistributedUnit (DU), gNB-DU, RemoteRadioHead. It is also called (RRH), Integrated Access and Backhaul / Backhauling (IAB) node, and the like. The small cell base station 10B communicates with the terminal 50B via the access link L1. The small cell base station 10B may be connected to the macro cell base station 20B via the backhaul link L2. The backhaul link L2 may be, for example, a wired backhaul such as an optical line or a wireless backhaul such as an IAB backhaul.

The small cell base station 10B may communicate with the terminal 50B by carrier aggregation (CA) or dual connectivity (DC) with the macro cell base station 20B. Although not shown, the small cell base station 10B may be connected to the core network 30 without going through the macro cell base station 20B.

Macrocell base stations 20A to 20C are base stations that form macrocells. A macro cell is a cell having a coverage of several hundred meters to several tens of kilometers in radius. The macrocell base stations 20A and / or 20B are also referred to as, for example, eNB, gNB, Donor eNodeB (DeNB), Donor eNodeB (DeNB), MasterNode, Donornode, and the like.

The core network 30 includes a device that manages the mobility of the location server 40 and the terminal 50 (for example, a mobility management device (Mobility Management Entity: MME), an access mobility management device (Access and Mobility Management Function: AMF), etc.). Is provided.

The location server 40 is a server that estimates the positions of the small cell base stations 10A and 10B. Here, the position is a point in a two-dimensional or three-dimensional coordinate system, and may be specified by a value of a coordinate axis. The location server 40 may be called, for example, Evolved Serving Mobile Location Center (E-SMLC) or the like. Further, the location server 40 may estimate the position of at least one of the macro cell base stations 20 to 20C and the terminals 50A and 50B.

The terminals 50A and 50B are predetermined terminals or devices such as smartphones, personal computers, in-vehicle terminals, in-vehicle devices, and stationary devices. The terminals 50A and 50B may be referred to as a User Equipment (UE) or the like. The terminals 50A and 50B may be mobile or fixed. The terminals 50A and 50B may support at least one communication method such as LTE, LTE-Advanced and New Radio (NR).

Hereinafter, when the small cell base stations 10A and 10B, the macro cell base stations 20A to 20C, and the terminals 50A and 50B are not distinguished, they are collectively referred to as the small cell base station 10, the macro cell base station 20, and the terminal 50. Note that FIG. 1 is merely an example, and the number, configuration, and the like of the small cell base station 10, the macro cell base station 20, and the terminal 50 included in the wireless communication system 1 are not limited to those shown.

Next, the position estimation of the small cell base station 10 in the wireless communication system 1 as described above will be described. The position estimation of the small cell base station 10 may be performed based on the information measured by using the reference signal (RS) received or transmitted by the small cell base station 10 (hereinafter referred to as measurement information). good. The RS may be a downlink RS (for example, a Positioning reference signal (PRS)) or an uplink RS (for example, a Sounding Reference Signal (SRS)). .. Note that position estimation may be paraphrased as positioning.

<Descent-based position estimation>
In the downlink-based position estimation, the position of the small cell base station 10 is estimated based on the measurement information measured using the downlink RS received by the small cell base station 10. The measurement information is, for example, information (Reference) indicating a time difference between a downlink RS from a reference base station and a downlink RS from another base station (macrocell base station 20 or another small cell base station 10). It may also be Signal Time Difference (RSTD)). Downlink-based position estimation is also called Observed Time Difference Of Arrival (OTDOA), downlink-based positioning, and the like.

FIG. 2 is a diagram showing an example of downlink-based position estimation according to the present embodiment. For example, in FIG. 2, the position of the small cell base station 10 is estimated based on the measurement information measured based on the downlink RS from the macro cell base stations 20A to 20C. In FIG. 2, it is assumed that the macrocell base station 20A is selected as the reference base station. Further, in the following, RSTD will be described as an example of the measurement information measured by using the downlink RS, but the measurement information is not limited to this.

As shown in FIG. 2, the small cell base station 10 has a time difference between the time _{T C} related to the reception of the downlink RS from the macro cell base station 20C and the _{time T A} related to the reception of the downlink RS from the macro cell base station 20A. and some RSTD _CA, and RSTD _BA is the time difference between the time T _a for the received downlink RS from time T _B and the macrocell base station 20A regarding the reception of the downlink RS from the macrocell base station 20B measures. The small cell base station 10 _{transmits the measured RSTD CA} and RSTD _BA to the location server 40.

The location server 40 estimates the location of the small cell base station 10 based on _{the RSTD CA} and RSTD _BA. As shown in FIG. 2, the location server 40 obtains _{a hyperbolic D CA} , which is a set of points in which the _{RSTD CAs} have a matching relationship, from the positions of the known macrocell base stations 20A and 20C. Similarly, the location server 40 obtains the hyperbolic D _BA is a set of points from the position of the known macrocell base stations 20A and 20B in a relationship RSTD _BA match. When RSTD _CA and RSTD _BA of measurement error (error) is not be uniquely determined intersection of the hyperbolas D _CA and D _BA as the position of the small cell base station 10. However, in reality, there is a measurement error, so the hyperbola D _CA may deviate by the sum of the positive and negative errors N _{CA +} + N _{CA- at the maximum.} Similarly, hyperbola D _BA is at most, there is a sum N _{BA + +} N _BA- only deviate potential positive and negative error. The known positions of the macrocell base stations 20A to 20C are, for example, points in a two-dimensional or three-dimensional coordinate system, and may be indicated by coordinates.

Therefore, the position estimated by hyperbolic D _CA and hyperbolic D _BA is a arbitrary point of maximum error N _{CA + +} N _CA- or N _{BA + +} N _BA- range R generated by. For example, the location server 40 may base the range R at an intermediate point within the range R or based on weighting and / or selection according to the state of the propagation path between the macrocell base stations 20A-20C and the small cell base station 10. The position of the small cell base station 10 in the inside is determined.

<Upward-based position estimation>
In the uplink-based position estimation, the position of the small cell base station 10 is estimated based on the measurement information measured using the uplink RS transmitted from the small cell base station 10. The measurement information is, for example, information (Uplink-Relative Time of) indicating the time difference between the reference timing in another base station (macrocell base station 20 or another small cell base station 10) and the uplink RS from the small cell base station 10. It may also be called Arrival (UL-RTOA)). Uplink-based position estimation is also called Uplink Time Difference Of Arrival (UTDOA), Uplink based positioning, or the like.

FIG. 3 is a diagram showing an example of up-based position estimation according to the present embodiment. For example, in FIG. 3, the position of the small cell base station 10 is estimated based on the measurement information measured by using the uplink RS from the small cell base station 10. In the following, UL-RTOA will be described as an example of the measurement information measured by using the uplink RS, but the measurement information is not limited to this.

As shown in FIG. 3, the macrocell base station 20A, 20B and 20C, respectively, are the time difference between the time T _A for the received uplink RS, T _B and T _C and the reference time T _REF from the small cell base station 10 UL-RTOA _A , UL-RTOA _B and UL-RTOA _C are measured. The macrocell base stations 20A, 20B and 20C transmit the measured UL-RTOA _A , UL-RTOA _B and UL-RTOA _C to the location server 40, respectively.

The location server 40 estimates the location of the small cell base station 10 based on _{UL-RTOA A} , UL-RTOA _B, and UL-RTOA _C. As shown in FIG. 3, the location server 40 obtains _{a circle RA} , which is a set of points in which _{UL-RTOA A matches, from the position of the known macrocell base station 20A.} Similarly, the location server 40 obtains a circle R _B and R _C is a set of points from the position of the known macrocell base station 20B and 20C in relation to UL-RTOA _B and UL-RTOA _C matches. UL-RTOA _A, when there is no error in the measurement of the UL-RTOA _B and UL-RTOA _C, circle R _A, can be uniquely determined intersection of R _B and R _C as the position of the small cell base station 10. However, in reality, there is a measurement error, so the circles _RA , R _B, and _RC are the sum of the positive and negative errors at the maximum, N _{A +} + N _A- , N _{B +} + N _B-, and N _{C +, respectively.} There is a possibility of shifting by + _NC-.

Therefore, the _{position estimated by the circles R A} , R _B and _RC is any point in the range R generated by the maximum error NA ₊ + _NA- , N _{B +} + N _B- or NC ₊ + _NC-. For example, the location server 40 may base the range R at an intermediate point within the range R or based on weighting and / or selection according to the state of the propagation path between the macrocell base stations 20A-20C and the small cell base station 10. The position of the small cell base station 10 in the inside is determined.

Note that, in FIGS. 2 and 3, other small cell base stations 10 other than the small cell base station 10 for which the position is estimated are not shown, but the present invention is not limited to this. The downlink RS transmitted from the macro cell base station 20 in FIG. 2 may be transmitted from the other small cell base station 10. Further, the uplink RS received by the macro cell base station 20 in FIG. 3 may be received and measured by another small cell base station 10.

As described above, the small cell base station 10 is based on the measurement information measured using the downlink RS (for example, RSTD) or the measurement information measured using the uplink RS (for example, UL-RTOA). The position is estimated. In the method of estimating the position of the small cell base station 10 using the downlink RS or the uplink RS, the method of estimating the position of the terminal 50 can be diverted, so that the registration of the position of the small cell base station 10 can be easily automated.

However, in the position estimation method using the downlink RS or the uplink RS, if the measurement error becomes large depending on the state of the propagation path of the downlink RS or the uplink RS, the estimation accuracy of the position of the small cell base station 10 may decrease. .. On the other hand, the small cell base station 10 includes a plurality of antennas A. Therefore, it is assumed that the state of the propagation path of the downlink RS or the uplink RS changes by switching a plurality of antenna patterns in which one or more antennas A that are turned on among the plurality of antennas A are different. Here, the state of the propagation path includes, for example, the direction of the propagation path on which the downlink RS or the uplink RS is propagated, the distance of the propagation path (that is, the distance between the small base station 10 and the macrocell base station 20), and the state of the propagation path. At least one of the quality of the propagation path (for example, path loss, channel state information (CSI), reference signal reception power (RSRP), reference signal reception quality (RSRQ), etc.) may be included.

Therefore, the small cell base station 10 according to the present embodiment controls the on or off of each of the plurality of antennas A and switches the plurality of antenna patterns to receive the downlink RS in each of the plurality of antenna patterns. Alternatively, the uplink RS is transmitted. Further, the location server 40 uses the measurement information (for example, RSTD) measured using the downlink RS received in each of the plurality of antenna patterns, or the uplink RS transmitted in each of the plurality of antenna patterns. The position of the small cell base station 10 is estimated based on the measurement information measured using (for example, UL-RTOA). As a result, the states of a plurality of propagation paths of the downlink RS or the uplink RS can be taken into consideration, so that the estimation accuracy of the position of the small cell base station 10 can be improved.

<Multiple antenna patterns>
Next, a method of estimating the position of a small cell base station using a plurality of antenna patterns will be described. 4A and 4B are diagrams showing an example of a propagation path for each antenna pattern according to the present embodiment. For example, in FIGS. 4A and 4B, the small cell base station 10 includes four antennas A1 to A4, but the number of antennas A included in the small cell base station 10 is not limited to this. FIG. 4A shows an antenna pattern 1 in which the antenna A1 is on and antennas A2 to A4 are off, and FIG. 4B shows an antenna pattern 3 in which the antenna A3 is on and the antennas A1, A2, and A4 are off.

As shown in FIGS. 4A and 4B, the propagation paths between the antenna A1 turned on in the antenna pattern 1 and each of the macrocell base stations 20A to 20C, and the antennas A3 and the macrocell base stations 20A to 20C turned on in the antenna pattern 3 It is different from the propagation path with each. Therefore, if the state of the propagation path between the antenna A1 and the macrocell base station 20C is poor (for example, it is affected by an obstacle as shown in FIG. 4A), the space between the antenna A3 and the macrocell base station 20C is affected. It is also assumed that the condition of the propagation path of the antenna is good (for example, it is not affected by obstacles as shown in FIG. 4B). In this case, the estimated position based on the antenna pattern 1 can be complemented by the estimated position based on the antenna pattern 3 and the known distance AD13 between the antennas A1 and A3 of the small cell base station 10.

≪Descent-based position estimation≫
FIG. 5 is a diagram showing an example of downlink-based position estimation using a plurality of antenna patterns according to the present embodiment. _{In FIG. 5, with the reference base station as the macrocell base station 20A, RSTD CA1} is measured with the antenna pattern 1 using the downlink RS from the macrocell base stations 20C and 20A, and the downlink RS from the macrocell base stations 20B and 20A is measured. _{It is assumed that RSTD BA1} is assumed in the antenna pattern 1 by using the antenna pattern 1. Similar to FIG. 2, it is assumed that the position of the small cell base station 10 is estimated within the range R1 where the hyperbola D _{CA1 based on RSTD CA1} and the hyperbola D _BA1 based on RSTD _{BA1 intersect.}

Here, when the state of the propagation path of the antenna A1 and the macrocell base station 20C, which are turned on in the antenna pattern 1, is bad (see, for example, FIG. 4A), the error N _{CA of the RSTD CA1} becomes large, so that the range R1 expands. There is a risk that the estimation accuracy of the position of the small cell base station 10 will decrease. Therefore, the small cell base station 10 has an antenna pattern 3 that turns on the antenna A3, which has a better propagation path condition than the antenna A1, and even if the RSTD _CA3 is measured using the downlink RS from the macro cell base stations 20C and 20A. good.

As shown in FIG. 5, the location server 40 obtains the _{hyperbola D CA3} , which is a set of points in which the _{RSTD CA3} has a matching relationship, from the positions of the known macrocell base stations 20A and 20C. Further, the location server 40 may estimate the position of the small cell base station 10 based on the known distance AD13 of the antennas A1 and A3 in the small cell base station 10. For example, in FIG. 5, a circle C1 which is a set of points at a distance AD13 is obtained from a hyperbola D _{CA3 based on RSTD CA3.} The location server 40 may obtain a range R2 where the range R1 and the circle C1 intersect, and determine the estimated position of the small cell base station 10 in the range R2.

As described above, in FIG. 5, a plurality of RSTDs measured in different antenna patterns 1 and 3 using the downlink RS from the same macrocell base stations 20A and 20C, and the antenna A1 turned on in the different antenna patterns 1 and 3. And the position of the small cell base station 10 is estimated based on the known distance AD13 between A3 and A3. As a result, the estimated position of the small cell base station 10 can be narrowed down to a range R2 smaller than the range R1 estimated by the single antenna pattern 1. Therefore, the estimation accuracy of the small cell base station 10 can be improved.

≪Upward base position estimation≫
FIG. 6 is a diagram showing an example of up-base position estimation using a plurality of antenna patterns according to the present embodiment. In FIG. 6, the macro cell base stations 20A, 20B and 20C measure UL-RTOA _A1 , UL-RTOA _B1 and UL-RTOA _{C1 using the uplink RS transmitted from the small cell base station 10 in the antenna pattern 1.} It shall be. Similar to FIG. 3, in the range R3 of the circle R _A1, R _B1 and R _C1 based on _{UL-RTOA A1, UL-RTOA} B1 and UL-RTOA _C1 intersect, that the position of the small cell base station 10 is estimated And.

Here, if the state of the propagation path of the antenna A1 and the macrocell base station 20C which is turned on by the antenna pattern 1 is poor (e.g., see FIG. 4A), since the error N _CA of UL-RTOA _A1 increases, the range R3 is larger However, the estimation accuracy of the position of the small cell base station 10 may decrease. Therefore, the small cell base station 10 transmits an uplink RS with an antenna pattern 3 that turns on the antenna A3, which has a better propagation path condition than the antenna A1, and the macro cell base stations 20A, 20B, and 20C perform the UL-RTOA _A3. , UL-RTOA _B3 and UL-RTOA _C3 may be measured.

As shown in FIG. 6, the location server 40 obtains the _{circle R C3} , which is a set of points in which _{UL-RTOA C3 has a matching relationship, from the position of the known macrocell base station 20C.} Further, the location server 40 may estimate the position of the small cell base station 10 based on the known distance AD13 of the antennas A1 and A3 in the small cell base station 10. For example, in FIG. 6, a circle C2 is a set of points of the distance AD13 from the circle R ₃ based on UL-RTOA _C3 is obtained. The location server 40 may obtain a range R4 where the range R3 and the circle C2 intersect, and determine the estimated position of the small cell base station 10 in the range R4.

As described above, in FIG. 6, a plurality of UL-RTOAs measured by the macrocell base station 20C based on the uplink RS transmitted in the different antenna patterns 1 and 3 and the antennas turned on in the different antenna patterns 1 and 3 are used. The position of the small cell base station 10 is estimated based on the known distance AD13 between A1 and A3. As a result, the estimated position of the small cell base station 10 can be narrowed down to a range R4 smaller than the range R3 estimated by the single antenna pattern 1. Therefore, the estimation accuracy of the small cell base station 10 can be improved.

Although FIGS. 4 to 6 illustrate the method of estimating the position of the small cell base station using the antenna patterns 1 and 3, the plurality of antenna patterns used for estimating the position of the small cell base station 10 are limited to this. No.

FIG. 7 is a diagram showing an example of a plurality of antenna patterns according to the present embodiment. As shown in FIG. 7, the antenna pattern is a combination of turning on or off each of the plurality of antennas A (for example, antennas A1 to A4 in FIG. 7) included in the small cell base station 10. A set of one or more antennas A (also referred to as an antenna set) to be turned on differs between the plurality of antenna patterns.

For example, one antenna A to be turned on differs between the antenna patterns 1 to 4. Further, the two antennas A that are turned on are different between the antenna patterns 5 to 8. As described above, in the plurality of antenna patterns, it is sufficient that the antenna sets to be turned on are different.

As described with reference to FIGS. 4 to 6, when the downlink RS received by a different antenna pattern or the uplink RS transmitted by a different antenna pattern is used for the position estimation of the small cell base station 10, between the antennas turned on by the different antenna pattern. The position is estimated based on the distance.

For example, when the antenna patterns 1 and 2 of FIG. 7 are used, the distance between the antennas A1 and A2 is taken into consideration. When the antenna patterns 2 and 3 are used, the distance between the antennas A2 and A3 is taken into consideration. When the antenna patterns 2 and 4 are used, the distance between the antennas A2 and A4 is taken into consideration. When the antenna patterns 3 and 4 are used, the distance between the antennas A3 and A4 is taken into consideration. In this way, the distance between the antennas used for position estimation may be determined for each pair of antenna patterns.

Further, when the antenna patterns 5 and 6 are used, the distance between the antenna set S1 including the antennas A1 and A2 and the antenna set S2 including the antennas A3 and A4 may be taken into consideration. Similarly, when the antenna patterns 7 and 8 are used, the distance between the antenna set S3 including the antennas A1 and A4 and the antenna set S4 including the antennas A2 and A3 may be considered.

As described above, the small cell base station 10 and other base stations (macrocell bases) are used by receiving the downlink RS or transmitting the uplink RS by using each of a plurality of antenna patterns in which one or more antennas to be turned on are different. Since a plurality of measurement information with the station 20 or another small cell base station 10) can be considered, the accuracy of estimating the position of the small cell base station 10 can be improved.

(Detailed configuration of wireless communication system)
Next, the detailed configuration of each device of the wireless communication system 1 as described above will be described. It should be noted that the following configurations are for showing the configurations necessary for the description of the present embodiment, and do not exclude that each device includes functional blocks other than those shown in the drawings.

<Hardware configuration>
FIG. 8 is a diagram showing an example of the hardware configuration of each device in the wireless communication system according to the present embodiment. Each device (for example, small cell base station 10, macro cell base station 20 or location server 40) in the wireless communication system 1 includes a processor 10a, a memory 10b, a storage device 10c, a communication device 10d for wired or wireless communication, and an input operation. It has at least an input device 10e for receiving the information, an output device 10f for outputting information, and one or more antennas A.

The processor 10a is, for example, a CPU (Central Processing Unit) and controls each device in the wireless communication system 1. The processor 10a may form a control unit that controls each device.

The memory 10b is composed of, for example, a ROM (ReadOnlyMemory), an EPROM (ErasableProgrammableROM), an EEPROM (ElectricallyErasableProgrammableROM), and / or a RAM (RandomAccessMemory).

The storage device 10c is composed of storage such as HDD (Hard Disk Drive), SSD (Solid State Drive) and / or eMMC (embedded MultiMediaCard), for example.

The communication device 10d is a device that communicates via a wired and / or wireless network, and is, for example, a network card, a communication module, or the like. Further, the communication device 10d may include an amplifier, an RF (Radio Frequency) device that performs processing related to radio signals, and a BB (BaseBand) device that performs baseband signal processing.

The RF device generates a radio signal transmitted from the antenna A by performing D / A conversion, modulation, frequency conversion, power amplification, etc. on the digital baseband signal received from the BB device, for example. Further, the RF device generates a digital baseband signal by performing frequency conversion, demodulation, A / D conversion, etc. on the radio signal received from the antenna A and transmits it to the BB device. The BB apparatus performs a process of converting a digital baseband signal into an IP packet and a process of converting an IP packet into a digital baseband signal.

The input device 10e is, for example, a keyboard, a touch panel, a mouse and / or a microphone. The output device 10f is, for example, a display and / or a speaker.

<Functional block configuration>
≪Small cell base station≫
FIG. 9 is a diagram showing an example of a functional block configuration of the small cell base station according to the present embodiment. As shown in FIG. 9, the small cell base station 10 includes antenna units 11a to 11d, a control unit 12, a communication unit 13, and a measurement unit 14. In the case of uplink-based position estimation, the measurement unit 14 may be omitted.

Further, in FIG. 9, four antenna units 11a to 11d are shown, but the number of antenna units 11 included in the small cell base station 10 is not limited to 4, and may be 2 or more. When the antennas A1 to A4 included in the antenna portions 11a to 11d and the antenna portions 11a to 11d are not distinguished, they are collectively referred to as the antenna portion 11 and the antenna A.

Each antenna unit 11 includes an antenna A. The antenna A may be composed of one or a plurality of antenna elements. The antenna A may be composed of an antenna panel including a plurality of antenna elements. Further, each antenna unit 11 may include a switch for switching the antenna A on or off.

The control unit 12 may control the on or off of the antenna A of each antenna unit 11. The control unit 12 may control the on or off of each antenna A to switch a plurality of antenna patterns (for example, FIG. 7) in which one or more antennas A that are turned on among the plurality of antennas A are different.

The control unit 12 may select the plurality of antenna patterns. When the information indicating the plurality of antenna patterns (antenna pattern information) is received from the location server 40 by the communication unit 13 described later, the plurality of antenna patterns indicated by the antenna pattern information may be selected. Alternatively, the control unit 12 may use a plurality of antennas, for example, based on the state of many propagation paths between the small cell base station 10 and another base station (macro cell base station 20 or another small cell base station 10). A pattern may be selected, and the communication unit 13 described later may transmit information indicating the selected antenna pattern to the location server 40. Further, the control unit 12 may select all predetermined antenna patterns and try all the antenna patterns in order.

The communication unit 13 transmits a downlink signal and / or receives an uplink signal with the terminal 50 via the access link L1. Further, the communication unit 13 receives the downlink signal and / or transmits the uplink signal to and from the macrocell base station 20 via the backhaul link L2.

Further, the communication unit 13 may communicate with the location server 40 via a protocol for communication with the location server 40. The protocol may be, for example, a protocol related to position estimation such as LTE positioning Protocol (LPP), LPP Annex (LPPa), or LPP Extensions (LPPe). For example, the communication unit 13 may receive or transmit information indicating the plurality of antenna patterns (antenna pattern information) via the protocol.

Specifically, the communication unit 13 may include at least one of the OTDOA communication unit 131 that performs communication related to downlink-based position estimation and the UTDOA communication unit 132 that performs communication related to uplink-based position estimation.

The OTDOA communication unit 131 receives the downlink RS (for example, PRS) used for measuring the measurement information (for example, RSTD) for estimating the position of the small cell base station 10 in each of the plurality of antenna patterns. Specifically, the OTDOA communication unit 131 may receive a plurality of downlink RSs transmitted in each of the plurality of cells in each antenna pattern. The plurality of cells may be formed by one or more macro cell base stations 20 and / or one or more other small cell base stations 10.

Further, the OTDOA communication unit 131 may receive information (assist information) that assists the measurement by the measurement unit 14 from the location server 40. The support information may include, for example, information about a cell that transmits the downlink RS to be measured (for example, cell ID, etc.), configuration information of the downlink RS (for example, timing, period, radio resource, etc.), and the like.

Further, the OTDOA communication unit 131 may transmit the measurement information (for example, RSTD) measured by using the downlink RS received in each of the plurality of antenna patterns to the location server 40.

The UTDOA communication unit 132 transmits an uplink RS (for example, SRS) used for measuring measurement information (for example, UL-RTOA) for position estimation of the small cell base station 10 in each of the plurality of antenna patterns. For example, the UTDOA communication unit 132 may transmit the uplink RS with different radio resources (for example, time resources and / or frequency resources) for each antenna pattern. Further, the UTDOA communication unit 132 may explicitly notify the macrocell base station 20 of the antenna pattern used for the transmission of the uplink RS in advance.

The measurement unit 14 measures the measurement information (for example, RSTD) based on the downlink RS received by the OTDOA communication unit 131. Specifically, the measuring unit 14 may measure each antenna pattern using the time difference of the downlink RS received in the plurality of cells (see, for example, FIG. 2) as the measurement information.

The antenna unit 11 may be realized by, for example, the antenna A and the communication device 10d. The control unit 12 may be realized by the processor 10a executing a program stored in the storage device 10c. The communication unit 13 and the measurement unit 14 may be realized by, for example, the communication device 10d, or may be realized by the processor 10a executing the program stored in the storage device 10c in addition to the communication device 10d. When executing a program, the program may be stored in a storage medium. The storage medium in which the program is stored may be a computer-readable non-transitory storage medium (Non-transitory computer readable medium). The non-temporary storage medium is not particularly limited, but may be, for example, a storage medium such as a USB (Universal Serial Bus) memory or a CD-ROM (Compact Disc ROM).

≪Macrocell base station≫
FIG. 10 is a diagram showing an example of a functional block configuration of a macrocell base station according to the present embodiment. As shown in FIG. 10, the macrocell base station 20 includes a communication unit 21, a measurement unit 22, and a control unit 23. In the case of downlink-based position estimation, the measurement unit 22 may be omitted.

The communication unit 21 transmits a downlink signal and / or receives an uplink signal with the terminal 50 via the access link L1. Further, the communication unit 21 transmits a downlink signal and / or receives an uplink signal with the small cell base station 10 via the backhaul link L2.

Further, the communication unit 21 may communicate with the location server 40 via a protocol for communication with the location server 40 (for example, LPPa). For example, the communication unit 21 may receive the antenna pattern information via the protocol.

Specifically, the communication unit 21 may include at least one of the OTDOA communication unit 211 that performs communication related to downlink-based position estimation and the UTDOA communication unit 212 that performs communication related to uplink-based position estimation.

The OTDOA communication unit 211 transmits a downlink RS (for example, PRS) used for measuring measurement information (for example, RSTD) for estimating the position of the small cell base station 10. For example, the OTDOA communication unit 211 may transmit the downlink RS with different radio resources (for example, time resources and / or frequency resources) for each antenna pattern.

The UTDOA communication unit 212 receives the uplink RS (for example, SRS) transmitted from the small cell base station 10 in each of the plurality of antenna patterns. The antenna pattern used to transmit the uplink RS may be recognized, for example, based on the radio resources (eg, time resources and / or frequency resources) to which the uplink RS is transmitted.

Further, the UTDOA communication unit 212 may receive support information for supporting the measurement by the measurement unit 22 from the location server 40. The support information may include, for example, information on the uplink RS to be measured (for example, timing, period, radio resource, etc.).

The measurement unit 22 measures measurement information (for example, UL-RTOA) based on the uplink RS received by the UTDOA communication unit 212. Specifically, the measuring unit 22 may measure each antenna pattern using the time difference between the reference time and the uplink RS (see, for example, FIG. 3) as the measurement information. The measuring unit 22 may be composed of, for example, a location measurement unit (LMU).

The control unit 23 controls the macro cell base station 20. Specifically, the control unit 23 may control the communication by the communication unit 21 and / or the measurement by the measurement unit 22.

The communication unit 21 and the measurement unit 22 may be realized by, for example, the communication device 10d, or may be realized by the processor 10a executing the program stored in the storage device 10c in addition to the communication device 10d. .. When executing a program, the program may be stored in the storage medium.

≪Location server≫
FIG. 11 is a diagram showing an example of the functional block configuration of the location server according to the present embodiment. As shown in FIG. 11, the location server 40 includes a storage unit 41, a communication unit 42, an estimation unit 43, and a selection unit 44. When a plurality of antenna patterns are selected by the small cell base station 10, the selection unit 44 may be omitted.

The storage unit 41 stores information used for estimating the position of the small cell base station 10. The information may include, for example, information indicating at least one of the following.
-Two base stations included in the position / position estimation target small cell base station 10 of other base stations (for example, macrocell base stations 20A to 20C, other small cell base stations 10) other than the position estimation target small cell base station 10. Distance between antennas A (or distance between two antenna sets)
・ State of propagation path in each antenna pattern

The communication unit 42 communicates with at least one of the small cell base station 10, the macro cell base station 20, and the terminal 50 by using a predetermined protocol (for example, LPP, LPPa, LPPe, etc.). For example, the communication unit 42 may receive information indicating the state of the propagation path (propagation path information) from the small cell base station 10 or the macro cell base station 20.

Further, the communication unit 42 may transmit antenna pattern information indicating a plurality of antenna patterns selected by the selection unit 44, which will be described later, to the small cell base station 10. Alternatively, the communication unit 42 may receive antenna pattern information indicating a plurality of antenna patterns selected by the small cell base station 10.

Further, the communication unit 42 may include at least one of the OTDOA communication unit 421 that performs communication related to downlink-based position estimation and the UTDOA communication unit 422 that performs communication related to uplink-based position estimation.

The OTDOA communication unit 421 may receive measurement information (for example, RSTD) measured using the downlink RS received by the small cell base station 10 from the small cell base station 10. The measurement information may correspond to each of the plurality of antenna patterns. Further, the OTDOA communication unit 421 may transmit the support information for measurement of the measurement information to the small cell base station 10.

Even if the UTDOA communication unit 422 receives the measurement information (for example, UL-RTOA) measured using the uplink RS transmitted from the small cell base station 10 from the macro cell base station 20 or another small cell base station 10. good. The measurement information may correspond to each of the plurality of antenna patterns. Further, the UTDOA communication unit 422 may transmit the support information for measurement of the measurement information to the macro cell base station 20 or another small cell base station 10.

The estimation unit 43 estimates the position of the small cell base station 10 based on the measurement information (for example, RSTD) received by the OTDOA communication unit 421 or the measurement information (for example, UL-RTOA) received by the UTDOA communication unit 422. I do. Specifically, the estimation unit 43 may estimate the position of the small cell base station 10 based on the above estimation information for at least one of the plurality of antenna patterns switched by the small cell base station 10.

Specifically, the estimation unit 43 estimates the position of the small cell base station 10 based on a plurality of measurement information corresponding to each of the plurality of antenna patterns and the distance between the antennas turned on by the plurality of antenna patterns. May be done. For example, as described with reference to FIG. 4-6, when the antenna patterns 1 and 3 are switched in the small cell base station 10, the estimation unit 43 receives the measurement information corresponding to the antenna patterns 1 and 3 and the antenna pattern. The position of the small cell base station 10 may be estimated based on the distance AD13 of the antennas A1 and A3 which are turned on in 1 and 3.

Further, the estimation unit 43 may weight the measurement information corresponding to each antenna pattern based on the state of the propagation path between the small cell base station 10 and the other base station for each antenna pattern. The estimation unit 43 may estimate the position of the small cell base station 10 based on the weighted measurement information. For example, as described with reference to FIGS. 4A and 4B, when the state of the propagation path between the antenna pattern 1 and the other base station is worse than that of the antenna pattern 3, the measurement information corresponding to the antenna pattern 3 is more than that of the antenna pattern 1. Larger weighting factors may be multiplied.

The selection unit 44 selects a plurality of antenna patterns of the small cell base station 10. For example, the selection unit 44 sets a plurality of antenna patterns based on, for example, the state of the propagation path between the small cell base station 10 and another base station (macro cell base station 20 or another small cell base station 10). You may choose. The communication unit 42 may transmit information indicating the selected antenna pattern to the small cell base station 10. Further, the selection unit 44 may select all predetermined antenna patterns, and the communication unit 42 may transmit information indicating the all antenna patterns to the small cell base station 10.

The communication unit 42 may be realized by, for example, the communication device 10d, or may be realized by the processor 10a executing the program stored in the storage device 10c in addition to the communication device 10d. The storage unit 41 may be realized by the storage device 10c. The estimation unit 43 and the selection unit 44 may be realized by the processor 10a executing a program stored in the storage device 10c. When executing a program, the program may be stored in the storage medium.

(Operation of wireless communication system)
Next, the operation of the wireless communication system 1 configured as described above will be described.

<Downward-based position estimation operation>
FIG. 12 is a diagram showing an example of a downlink-based position estimation operation according to the present embodiment. FIG. 12 describes an example of estimating the position of the small cell base station 10 based on the downlink RS from the macro cell base stations 20A to 20C. As described above, the downlink RS is not limited to the macro cell base station 20, and may be transmitted from another small cell base station 10. Further, in FIG. 12, the measurement information measured by using the downlink RS is assumed to be RSTD, but the measurement information is not limited to this.

Further, this operation may be started according to the request information from the location server 40. The request information may be, for example, information requesting measurement in the small cell base station 10. Alternatively, it may be started when the small cell base station 10 satisfies a predetermined condition. The predetermined condition may be, for example, a case where the movement of the small cell base station 10 is detected. Further, it is assumed that the small cell base station 10 has acquired the support information from the location server 40 for the measurement of the downlink RS before the start of this operation. Further, it is assumed that i has been initialized before the start of this operation.

In step S101, the small cell base station 10 selects M (M ≧ 2) antenna patterns for measuring downlink RS. For example, the small cell base station 10 may select M antenna patterns based on the antenna pattern information indicating the M antenna patterns notified from the location server 40. The antenna pattern information may be included in the support information or the request information, for example. Alternatively, the small cell base station 10 itself may select a plurality of antenna patterns. Alternatively, the small cell base station 10 may select all antenna patterns (for example, antenna patterns 1 to 8 in FIG. 7).

In step S102, the small cell base station 10 controls on or off of each antenna A according to the i-th antenna pattern (1 ≦ i ≦ M) among the M antenna patterns selected in step S102.

In step S103, the small cell base station 10 receives the downlink RS from the macro cell base stations 20A to 20C in the i-th antenna pattern.

In step S104, the small cell base station 10 measures at least one RSTD based on the downlink RS received in the i-th antenna pattern.

In step S105, the small cell base station 10 counts up the subscript i of the antenna pattern by 1, and determines whether or not the counted up i exceeds the number M of the antenna patterns selected in step S101. If i ≦ M, this operation returns to step S102, and if i> M, this operation proceeds to step S106. Here, it is assumed that the initial value of i that is initialized before the start of this operation is 1, but the initial value is not limited to this. For example, when the initial value of i is 0, it may be determined in step S105 whether or not i exceeds M-1 (whether or not i> M-1).

In step S106, the small cell base station 10 transmits measurement information indicating the measurement results using each of the M antenna patterns to the location server 40. The measurement information may include one or more RSTDs measured for each of the M antenna patterns and information indicating each of the M antenna patterns (for example, M antenna pattern IDs).

In step S107, the location server 40 estimates the position of the small cell base station 10 based on the measurement information received from the small cell base station 10. Specifically, the location server 40 may estimate the position of the small cell base station 10 based on the RSTD measured by at least one of the M antenna patterns.

For example, in FIG. 5, the location server 40 includes a RSTD _CA1 and RSTD _BA1 of the antenna pattern 1, and RSTD _CA antenna pattern 3, the antenna A3 to be turned on by the antenna A1 and the antenna pattern 3 which is turned on in the antenna pattern 1 The range R2 of the estimated position of the small cell base station 10 is determined based on the distance of.

<Upward-based position estimation operation>
FIG. 13 is a diagram showing an example of an ascending-based position estimation operation according to the present embodiment. FIG. 13 describes an example of estimating the position of the small cell base station 10 based on the uplink RS from the small cell base station 10. As described above, the uplink RS is not limited to the macro cell base station 20, and may be received and measured by another small cell base station 10. Further, in FIG. 13, the measurement information measured by using the uplink RS is assumed to be UL-RTOA, but the measurement information is not limited to this.

Further, in FIG. 13, the uplink RS configuration information (for example, timing, cycle, radio resource, etc.) may be configured in the small cell base station 10 by any of the macro cell base stations 20A to 20C. The configuration information may be notified from the location server 40 to the macrocell base stations 20A to 20C as support information for measuring the uplink RS, or may be notified to the location server 40 from any of the macrocell base stations 20A to 20C. May be done.

Further, this operation may be started according to the request information from the location server 40. The request information may be, for example, information requesting measurement at the macrocell base stations 20A to 20C (LMU) selected by the location server 40. Alternatively, it may be started when the small cell base station 10 satisfies a predetermined condition. The predetermined condition may be, for example, a case where the movement of the small cell base station 10 is detected. Further, it is assumed that i has been initialized before the start of this operation.

Steps S201 and S202 of FIG. 13 are the same as steps S101 and S102 of FIG. In step S203, the small cell base station 10 transmits an uplink RS using the i-th antenna pattern.

In step S204, the macrocell base stations 20A to 20C each measure UL-RTOA based on the uplink RS transmitted by the i-th antenna pattern.

In step S205, the small cell base station 10 counts up the subscript i of the antenna pattern by 1, and determines whether or not the counted up i exceeds the number M of the antenna patterns selected in step S101. If i ≦ M, this operation returns to step S202, and if i> M, this operation proceeds to step S206. Here, it is assumed that the initial value of i that is initialized before the start of this operation is 1, but the initial value is not limited to this. For example, when the initial value of i is 0, it may be determined in step S105 whether or not i exceeds M-1 (whether or not i> M-1).

In step S206, the macrocell base stations 20A to 20C each transmit measurement information indicating the measurement result using each of the M antenna patterns to the location server 40. The measurement information may include UL-RTOA measured for each of the M antenna patterns and information indicating each of the M antenna patterns (for example, M antenna pattern IDs).

In step S207, the location server 40 estimates the position of the small cell base station 10 based on the measurement information received from the macro cell base stations 20A to 20C. Specifically, the location server 40 may estimate the position of the small cell base station 10 based on the UL-RTOA measured by at least one of the M antenna patterns.

For example, in FIG. 6, the location server 40 has UL-RTOA _A , UL-RTOA _B and UL-RTOA _{C of antenna pattern 1, UL-RTOA C} of antenna pattern 3, and antenna A1 turned on in antenna pattern 1. The range R4 of the estimated position of the small cell base station 10 is determined based on the distance from the antenna A3 that is turned on in the antenna pattern 3 and the antenna pattern 3.

As described above, the small cell base station 10 and other base stations (macrocell bases) are used by receiving the downlink RS or transmitting the uplink RS by using each of a plurality of antenna patterns in which one or more antennas to be turned on are different. Since a plurality of measurement information with the station 20 or another small cell base station 10) can be considered, the accuracy of estimating the position of the small cell base station 10 can be improved.

(Other embodiments)
The above embodiment may be combined with the correctness confirmation of the position of the small cell base station 10. For example, a base station other than the small cell base station 10 whose position is to be estimated, or a server on the core network 30 (for example, a location server 40) is a position determined based on at least one of the following. , The correctness of the position estimated in the above embodiment may be determined based on the comparison result with the position of the small cell base station 10 whose position is estimated in the above embodiment.
-Position of small cell base station 10 determined based on GPS signals-Positioning function of access points of other communication methods (for example, WiFi (registered trademark) or Bluetooth (registered trademark)) (for example, Wi-Fi CERTIFIED Location) ), And information on the location and surrounding cells of the small cell base station 10 (for example, the result of network screening).
-Variation of cells registered in the Ncell table-Internet protocol (IP) information assigned to the small cell base station 10 (for example, IP address)

Further, the above embodiment may be combined with the movement detection of the position of the small cell base station 10. For example, the small cell base station 10 itself whose position is to be estimated, other base stations other than the small cell base station 10, or a server on the core network 30 (for example, a location server 40) is at least one of the following. Based on the above, the movement of the small cell base station 10 whose position is estimated in the above embodiment may be detected.
-Position of small cell base station 10 determined based on GPS signals-Positioning function of access points of other communication methods (for example, Wi-Fi (registered trademark) or Bluetooth (registered trademark)) (for example, Wi-Fi) Information on the location and surrounding cells of the small cell base station 10 obtained by CERTIFIED Location) (for example, the result of network screening)
-Variation of cells registered in the Ncell table-Internet protocol (IP) information assigned to the small cell base station 10 (for example, IP address)
-Information detected by the sensor included in the small cell base station 10 (sensor information)
-Information indicating the power supply status or operating status of the small cell base station 10 (operation information)

The sensor that detects the sensor information may be, for example, a gyro sensor, a light sensor, or a switch sensor. For example, a gyro sensor or the like provided inside the small cell base station 10) may detect changes in acceleration or posture of the small cell base station 10 as sensor information. Further, a light sensor provided on a contact surface such as the bottom of the small cell base station 10 may detect a change in brightness of the contact surface as sensor information. Further, the fluctuation of the switch may be detected as the sensor information by the switch sensor provided on the contact surface such as the bottom of the small cell base station 10.

The embodiments described above are for facilitating the understanding of the present invention, and are not for limiting and interpreting the present invention. The flowchart, sequence, each element included in the embodiment, its arrangement, material, condition, shape, size, and the like described in the embodiment are not limited to those exemplified, and can be changed as appropriate. In addition, the configurations shown in different embodiments can be partially replaced or combined.

1 ... Wireless communication system, 10 ... Small cell base station, 20 ... Macrocell base station, 30 ... Core network, 40 ... Location server, 50 ... Terminal, 10a ... Processor, 10b ... Memory, 10c ... Storage device, 10d ... Communication device 10, e ... Input device, 10f ... Output device, A ... Antenna, 11 ... Antenna unit, 12 ... Control unit, 13 ... Communication unit, 131 ... OTDOA communication unit, 132 ... UTDOA communication unit, 14 ... Measurement unit, 21 ... Communication Unit, 211 ... OTDOA communication unit, 212 ... UTDOA communication unit, 22 ... measurement unit, 41 ... storage unit, 42 ... communication unit, 421 ... OTDOA communication unit, 422 ... UTDOA communication unit, 43 ... estimation unit, 44 ... selection unit

Claims (9)

1. A wireless device with multiple antennas
   A control unit that controls the on or off of each of the plurality of antennas and switches a plurality of antenna patterns in which the antenna to be turned on is different among the plurality of antennas.
   With each of the plurality of antenna patterns, a communication unit that receives a downlink reference signal used for measuring measurement information for position estimation of the wireless device or transmits an uplink reference signal used for measuring the measurement information. ,
   A wireless device equipped with.
2. A measuring unit for measuring the measurement information for each of the plurality of antenna patterns using the downlink reference signal from each base station is provided.
   The communication unit transmits the measurement information to the server.
   The wireless device according to claim 1.
3. The communication unit transmits the uplink reference signal in each of the plurality of antenna patterns, and the communication unit transmits the uplink reference signal.
   The measurement information for each of the plurality of antenna patterns measured at each base station using the uplink reference signal is transmitted from each base station to the server.
   The wireless device according to claim 1.
4. The control unit selects the plurality of antenna patterns.
   The wireless device according to any one of claims 1 to 3.
5. Location server according to claim 1. A server that estimates the position of a wireless device provided with a plurality of antennas.
   Measurement information measured using a downlink reference signal received in each of a plurality of antenna patterns in which the antenna to be turned on is different among the plurality of antennas and the plurality of antennas can be switched on or off by controlling the on / off of the plurality of antennas. Alternatively, a communication unit that receives measurement information measured using uplink reference signals transmitted by each of the plurality of antenna patterns, and a communication unit.
   An estimation unit that estimates the position of the wireless device based on the measurement information for at least one of the plurality of antenna patterns.
   Server with.
6. The estimation unit estimates the position of the wireless device based on the distance between at least two antennas among the plurality of antennas included in the wireless device.
   The server according to claim 5.
7. The estimation unit estimates the position of the radio device based on the measurement information weighted based on the state of the propagation path between the radio device and each base station for each antenna pattern.
   The server according to claim 5 or 6.
8. A selection unit for selecting the plurality of antenna patterns is provided.
   The communication unit transmits information indicating the plurality of antenna patterns to the wireless device.
   The server according to any one of claims 5 to 7.
9. A wireless communication method for estimating the position of a wireless device equipped with multiple antennas.
   In the wireless device
   A step of controlling the on or off of each of the plurality of antennas to switch a plurality of antenna patterns in which the antennas to be turned on are different among the plurality of antennas.
   A step of receiving a downlink reference signal used for measuring measurement information for position estimation of the wireless device or transmitting an uplink reference signal used for measuring the measurement information in each of the plurality of antenna patterns.
   Wireless communication method having.

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