JP7141058B2 - Wireless communication system and terminal information collection method - Google Patents

Description

In the present invention, there are a plurality of communication cells to which a radio base station and one or more radio terminal stations are connected, a central control station connected to the radio base station of each communication cell, and a radio terminal of each communication cell. The present invention relates to a wireless communication system and a terminal information collection method in which a central control station collects terminal information used for grasping the status of stations. Here, an example of terminal information is propagation channel information between a radio base station and a radio terminal station.

As a service using RSSI (Received Signal Strength Indicator), which is signal strength information of a wireless signal, there is a wireless terminal station location providing service in a wireless LAN system. As an example of a method for realizing this service, there is a method in which a wireless terminal station measures RSSI from beacon signals transmitted from a plurality of wireless base stations and calculates the position of the wireless terminal station from the plurality of RSSIs. Patent document 1). As another application example, a service for detecting human activity from RSSI fluctuation characteristics is being studied (for example, Non-Patent Document 2).

Furthermore, in order to further improve the performance of the above services, studies using propagation channel information (CSI: Channel State Information) in addition to RSSI are underway. Propagation channel information in a wireless LAN system is a propagation path response (amplitude information and phase difference between antennas) for each subcarrier on a path between a radio base station antenna and a radio terminal station antenna. For example, Non-Patent Literature 3 discusses techniques for improving the accuracy of position estimation, activity detection, and the like by using propagation channel information.

Navarro Eduardo, 2011. “Wi-Fi Localization Using RSSI Fingerprinting”, California Polytechnic State University, United States of America.http://digitalcommons.calpoly.edu/cpesp/17/ (17 Aug. 2011) Wang, Wei, et al. "Understanding and modeling of wifi signal based human activityrecognition." Proceedings of the 21st annual international conference on mobile computing and networking. ACM, 2015. Yang, Zheng, ZimuZhou, and Yunhao Liu. "From RSSI to CSI: Indoorlocalization via channel response." ACM Computing Surveys (CSUR) 46.2(2013): 25.

In a wireless communication system, in order to stably provide the above services, it is required to collect RSSI and propagation channel information frequently. When collecting RSSI, a signal such as a beacon signal that is constantly transmitted can be used, and RSSI is a small amount of power information common to all subcarriers. However, the load on the wireless communication system is small. On the other hand, when collecting propagation channel information, an additional signal for collecting propagation channel information, for example, a measurement signal for measuring propagation channel information transmitted by a radio base station, or a radio terminal station is required, and the amount of individual information is extremely large, so frequent collection increases the load on the wireless communication system.

FIG. 8 shows a configuration example of a conventional wireless communication system.
In FIG. 8, a radio base station 10-i and one or more radio terminal stations 20-ij each constitute a communication cell 50-i. In this example, i is 1 to 3 and j is 1 to 3. The radio base station 10-i collects propagation channel information between the radio terminal stations 20-ij under its control and transfers the collected information to the central control station 40. FIG.

FIG. 9 shows a processing procedure example of a conventional terminal information collection method.
In FIG. 9, each radio base station 10-i transmits a measurement signal M for measuring propagation channel information to each subordinate radio terminal station 20-ij. Next, the wireless terminal station 20-ij measures the propagation channel information from the received measurement signal M, and notifies the wireless base station 10-i to which it belongs of the measurement result by the notification signal R. FIG. When each radio base station 10-i completes collecting the propagation channel information, it transmits a transfer signal containing the propagation channel information to the central control station 40 at different times. to get

In such a conventional method of collecting propagation channel information, each radio base station 10-i individually collects the propagation channel information of the radio terminal stations 20-ij under its control, and the propagation channel information collected by each radio base station 10-i is Since the channel information is transferred to the centralized control station 40 with a time delay, much transfer time is required.

The present invention efficiently collects terminal information such as propagation channel information between a radio base station and a radio terminal station in a radio communication system having a plurality of communication cells in which a radio base station and one or more radio terminal stations are connected. It is an object of the present invention to provide a wireless communication system and a terminal information collection method that can collect information well.

In a first invention, there are a plurality of communication cells in which a radio base station and one or more radio terminal stations are connected, each radio base station in each communication cell transmits a measurement signal, and a radio base station under the control of the radio base station In a radio communication system in which terminal information used for grasping the status of a radio terminal station is measured from a measurement signal received by the terminal station, and a notification signal generated from the terminal information is collected by a central control station via a radio base station to which the terminal station belongs. , one or more collection stations arranged at positions capable of receiving radio signals transmitted by each radio terminal station of a plurality of communication cells and connected to the central control station via a radio line; means for receiving and collecting notification signals transmitted by wireless terminal stations, and transmitting a transfer signal formed by combining terminal information of each wireless terminal station to a central control station, wherein the central control station receives from the collecting station It includes means for analyzing the transmitted transfer signal and acquiring terminal information of each wireless terminal station.

In the wireless communication system of the first invention, the wireless terminal station includes means for generating a notification signal from compressed data obtained by compressing the measured terminal information, and the collection station includes compressed data of the notification signal transmitted by each wireless terminal station. means for combining the compressed data as they are, or for combining a part of the compressed data including decompressed terminal information, and further compressing the combined information to generate a transfer signal.

In a second invention, there are a plurality of communication cells in which a radio base station and one or more radio terminal stations are connected, each radio base station in each communication cell transmits a measurement signal, and a radio base station under the control of the radio base station A wireless communication system in which terminal information used for grasping the status of a wireless terminal station is measured from a measurement signal received by the terminal station, and a notification signal generated from the terminal information is collected by the central control station via the associated wireless base station. In the terminal information collection method, one or more collection stations are arranged at positions capable of receiving radio signals transmitted by each radio terminal station of a plurality of communication cells and are connected to the central control station via a radio line, The collecting station has a step of receiving and collecting notification signals transmitted by each wireless terminal station, and transmitting a transfer signal formed by combining terminal information of each wireless terminal station to the central control station, The station has the step of analyzing the forwarded signal transmitted from the collection station to obtain terminal information for each wireless terminal station.

In the terminal information collection method of the second invention, the wireless terminal station has a step of generating a notification signal from compressed data obtained by compressing the measured terminal information, and the collection station generates a notification signal transmitted by each wireless terminal station. Combining the compressed data as it is, or combining a part of the compressed data including decompressed terminal information, and further compressing the combined information to generate a transfer signal.

According to the present invention, collection efficiency can be improved by collecting terminal information of each wireless terminal station at a collection station and collectively transferring propagation channel information included in the terminal information to a centralized control station.

1 is a diagram showing a configuration example of a wireless communication system of the present invention; FIG. It is a time chart which shows the example of a processing procedure of the terminal information collection method of this invention. FIG. 4 is a diagram showing an example of combining propagation channel information (compressed data); 1 is a diagram showing a configuration example of a radio base station 10 in a radio communication system of the present invention; FIG. 1 is a diagram showing a configuration example of a wireless terminal station 20 in a wireless communication system of the present invention; FIG. 3 is a diagram showing a configuration example of a collection station 30 in the wireless communication system of the present invention; FIG. 1 is a diagram showing a configuration example of a centralized control station 40 in a wireless communication system of the present invention; FIG. 1 is a diagram showing a configuration example of a conventional wireless communication system; FIG. It is a time chart which shows the example of a processing procedure of the conventional terminal information collection method.

FIG. 1 shows a configuration example of a radio communication system of the present invention.
In FIG. 1, the radio communication system has a configuration in which a plurality of communication cells 50-i are connected to a radio base station 10-i and one or more radio terminal stations 20-ij. In this example, i is 1-3 and j is 1-3. Furthermore, one or more collection stations 30 are arranged at positions where they can receive radio signals transmitted by the radio terminal stations 20-ij of each communication cell 50-i, and the collection stations 30 and the central control station 40 are connected via radio lines Connected. The radio base station 10-i and the central control station 40 are also connected via a radio line as shown in FIG. 8, but are omitted here.

FIG. 2 shows a processing procedure example of the terminal information collection method of the present invention. Here, based on the configuration of FIG. 1, propagation channel information will be described as an example of terminal information collected by the centralized control station 40. FIG.
In FIG. 2, the radio base station 10-1 transmits a measurement signal M for measuring propagation channel information to the radio terminal stations 20-11 and 20-12 under its control, and the radio terminal stations 20-11 and 20 -12 measures the propagation channel information (CSI) between the radio base station 10-1 and its own station from the measurement signal M of the radio base station 10-1.

Next, the radio terminal stations 20-11 and 20-12 generate notification signals R from the compressed data obtained by compressing the measured propagation channel information into phase information, and transmit them to the radio base station 10-1 in a predetermined order. . At the same time, the collection station 30 receives notification signals R transmitted from the wireless terminal stations 20-11 and 20-12 to the wireless base station 10-1 in a predetermined order, and obtains propagation channel information for each wireless terminal station. Collect compressed compressed data.

Next, similar measurements are made between the radio base station 10-2 and the subordinate radio terminal stations 20-21 and between the radio base station 10-3 and the subordinate radio terminal stations 20-31 to 20-33. A signal M is transmitted, propagation channel information is measured, and a notification signal R is transmitted. At the same time, the collection station 30 also receives each notification signal R and collects compressed data obtained by compressing the propagation channel information in each wireless terminal station. . Note that the timing and period at which the radio base stations 10-1 to 10-3 each transmit the measurement signal M may be set in advance or controlled using a control signal transmitted from the collection station 30. good.

Next, the collecting station 30 compresses the collected propagation channel information between the radio base stations 10-1 to 10-3 and the radio terminal stations 20-11 to 20-33, compressing the compressed data to subcarriers #1, They are sorted by #2, #3, . Here, CSI(a,b,#c) indicates propagation channel information or compressed data of subcarrier #c between the radio base station 10-a and the radio terminal station 20-b. Furthermore, the collection station 30 further compresses the combined compressed data to form a transfer signal and transfers it to the central control station 40 .

The centralized control station 40 receives the transfer signal transferred from the collection station 30, decompresses the compressed data in the collection station 30 from the transfer signal, and decompresses the compressed data in the wireless terminal station 20-ij, Propagation channel information of each wireless terminal station 20-ij is obtained in time series. In addition, the compressed data (phase information) or decompressed propagation channel information is used to perform position estimation, activity detection, and the like.

In this way, the collection station 30 collects the compressed data obtained by compressing the propagation channel information of each wireless terminal station 20-ij, and collectively transfers it to the central control station 40 as a combined and compressed transfer signal. Propagation channel information of the wireless terminal station 20-ij can be collected with high efficiency.

FIG. 4 shows a configuration example of the radio base station 10 in the radio communication system of the present invention. Here, only the main functional blocks related to the present invention are extracted and shown, and the functional blocks used in general radio base stations and their explanations are omitted.

In FIG. 4, a radio base station 10 is composed of an antenna 11, a transmitter 12, and a measurement signal generator 13. FIG. Note that a configuration that supports MIMO transmission using a plurality of antennas 11 may also be used. The measurement signal generator 13 generates a measurement signal for the wireless terminal station 20 to measure propagation channel information, and outputs the measurement signal to the transmitter 12 . The transmitter 12 converts the measurement signal generated by the measurement signal generator 13 into a wireless LAN signal addressed to a wireless terminal station under its control, and transmits the wireless LAN signal from the antenna 11 as a wireless signal.

FIG. 5 shows a configuration example of the wireless terminal station 20 in the wireless communication system of the present invention. Here, only the main functional blocks related to the present invention are extracted and shown, and the functional blocks generally used in wireless terminal stations and their explanations are omitted.

In FIG. 5, the wireless terminal station 20 comprises an antenna 21, a transmitter 22, a receiver 23, a notification signal generator 24, and a propagation channel information measuring section 25. FIG. Note that a configuration that supports MIMO transmission using a plurality of antennas 21 may also be used.

The receiving section 23 converts the radio signal received by the antenna 21 into a measurement signal that can be handled by the propagation channel information measuring section 25 and outputs the measurement signal to the propagation channel information measuring section 25 . The propagation channel information measuring unit 25 measures the propagation channel information from the measurement signal input from the receiving unit 23, and sends the measurement result to the notification signal generating unit 24 as compressed data compressed by a compression method specified by the wireless LAN. Output. The notification signal generation unit 24 generates a notification signal from the compressed data of the propagation channel information input from the propagation channel information measurement unit 25 and outputs the notification signal to the transmission unit 22 . The transmission unit 22 converts the notification signal input from the notification signal generation unit 24 into a wireless LAN signal addressed to the wireless base station 10 and the collection station 30, and transmits the signal from the antenna 21 as a wireless signal.

FIG. 6 shows a configuration example of the collection station 30 in the wireless communication system of the present invention.
In FIG. 6, the collection station 30 comprises an antenna 31, a transmitter 32, a receiver 33, a collector 34, a combiner 35, and a transfer signal generator . Note that a configuration that supports MIMO transmission using a plurality of antennas 31 may also be used.

The receiving unit 33 converts the radio signal received by the antenna 31 into a notification signal that can be handled by the collecting unit 34 and outputs the notification signal to the collecting unit 34 . The collection unit 34 collects compressed data of propagation channel information from the notification signal of each wireless terminal station input from the reception unit 33 and outputs the collection result to the combination unit 35 . The combining unit 35 combines the compressed data of the propagation channel information input from the collecting unit 34 as shown in FIG. The transfer signal generation unit 36 generates a transfer signal for collectively transferring the compressed data of the propagation channel information input from the coupling unit 35 and outputs the transfer signal to the transmission unit 32 . The transmission unit 32 converts the transfer signal input from the transfer signal generation unit 36 into a wireless LAN signal addressed to the central control station 40, and transmits the signal from the antenna 31 as a wireless signal.

FIG. 7 shows a configuration example of the central control station 40 in the wireless communication system of the present invention. Here, only the main functional blocks related to the present invention are extracted and shown, and functional blocks generally used in a centralized control station and description thereof are omitted.

7, the centralized control station 40 is composed of an antenna 41, a receiver 42, a transfer signal analyzer 43, a memory 44, a decompressor 45, and a determiner . Note that a configuration that supports MIMO transmission using a plurality of antennas 41 may also be used.

The receiving unit 42 converts the radio signal received by the antenna 41 into a transfer signal that can be handled by the transfer signal analysis unit 43 and outputs the transfer signal to the transfer signal analysis unit 43 . The transfer signal analysis unit 43 extracts the compressed data of the propagation channel information combined from the transfer signal from the collection station 30 input from the reception unit 42 and outputs the extraction result to the storage unit 44 . The storage unit 44 stores the compressed data of the propagation channel information of each wireless terminal station input from the transfer signal analysis unit 43 in chronological order. The decompression unit 45 decompresses the propagation channel information from the compressed data of the propagation channel information by a decompression method specified for wireless LAN. A determination unit 46 determines the position and behavior from the propagation channel information in each wireless terminal station. Alternatively, the compressed data of the propagation channel information is used directly to determine the position and behavior.

Although the case where there is only one collection station 30 has been described here, the collection station 30 is distributed at positions where it can receive the notification signal (compressed data of propagation channel information) transmitted by the wireless terminal station 20-ij of each communication cell 50-i. You may have more than one. In this case, transfer signals obtained by combining compressed data of propagation channel information collected by each collecting station 30 are transferred to the central control station 40 at different times. Alternatively, one collection station 30 out of a plurality of collection stations may recollect the compressed data of the propagation channel information collected by the other collection stations 30 and collectively transfer them to the central control station 40 . In addition, for propagation channel information that cannot be collected by the collection station 30 due to the existence of the radio terminal station 20-ij that is separate from the collection station 30, the radio base station 10-i to which the radio terminal station 20-ij belongs is used in the same manner as in the past. may be transferred to the central control station 40 via the

In the above explanation, the case where the collection station 30 does not decompress the compressed data of the propagation channel information of each wireless terminal station, but combines the compressed data as it is and transfers the further compressed transfer signal to the central control station 40 has been explained. However, depending on the communication environment (transmission rate, etc.) of the transfer signal, the transmission channel information may be decompressed partly or wholly of the compressed data of the propagation channel information.

10 wireless base station 11 antenna 12 transmitter 13 measurement signal generator 20 wireless terminal station 21 antenna 22 transmitter 23 receiver 24 notification signal generator 25 propagation channel information measuring unit 30 collection station 31 antenna 32 transmitter 33 receiver 34 collection Section 35 Coupling Section 36 Transfer Signal Generation Section 40 Centralized Control Station 41 Antenna 42 Receiving Section 43 Transfer Signal Analysis Section 44 Storage Section 45 Decompression Section 46 Judgment Section

Claims (6)

Measurement in which there are multiple communication cells in which a radio base station and one or more radio terminal stations are connected, each radio base station in each communication cell transmits a measurement signal, and the radio terminal station under the radio base station receives the measurement signal. In a radio communication system in which terminal information used for grasping the status of a radio terminal station is measured by a signal, and a notification signal generated from the terminal information is collected by a central control station via a radio base station to which the terminal information belongs,
one or more collection stations arranged at positions capable of receiving radio signals transmitted by each of the radio terminal stations of the plurality of communication cells and connected to the central control station via a radio line;
The collection station receives and collects the notification signal transmitted by each wireless terminal station, and transmits a transfer signal formed by combining the terminal information of each wireless terminal station to the central control station. including
the one or more collection stations are a plurality of collection stations ;
The plurality of collection stations transfer the transfer signal to the centralized control station at different times, or one of the plurality of collection stations transfers the transfer signal collected by another collection station. collectively transfer the signals to the centralized control station;
A wireless communication system, wherein the central control station includes means for analyzing the transfer signal transmitted from the collecting station and acquiring terminal information of each wireless terminal station. In the wireless communication system according to claim 1,
The wireless terminal station includes means for generating the notification signal from compressed data obtained by compressing the measured terminal information,
The collection station combines the compressed data of the notification signals transmitted by the respective wireless terminal stations as they are, or combines a part of the compressed data including decompressed terminal information, and further compresses the combined information. A wireless communication system, comprising means for generating the transfer signal. In the wireless communication system according to claim 1,
The wireless terminal station includes means for generating the notification signal from compressed data obtained by compressing the measured terminal information,
The collecting station combines the compressed data of the notification signal transmitted by each wireless terminal station as it is, or combines the compressed data including the terminal information decompressed in part, and combines the compressed data according to the communication environment of the transfer signal. and means for generating the transfer signal including the terminal information obtained by decompressing part or all of the compressed data. Measurement in which there are multiple communication cells in which a radio base station and one or more radio terminal stations are connected, each radio base station in each communication cell transmits a measurement signal, and the radio terminal station under the radio base station receives the measurement signal. A terminal information collection method for a radio communication system in which terminal information used for grasping the status of a radio terminal station is measured by a signal, and a notification signal generated from the terminal information is collected by a central control station via a radio base station to which the terminal information belongs,
one or more collection stations arranged at positions capable of receiving radio signals transmitted by the radio terminal stations of the plurality of communication cells and connected to the central control station via a radio line;
a step in which the collecting station receives and collects the notification signal transmitted by each wireless terminal station, and transmits a transfer signal formed by combining the terminal information of each wireless terminal station to the central control station; has
the one or more collection stations are a plurality of collection stations ;
In the transmitting step, the plurality of collection stations transfer the transfer signal to the centralized control station at different times, or one of the plurality of collection stations transfers the transfer signal to another collection station. collectively transferring the transfer signals collected by the station to the centralized control station;
A terminal information collection method, comprising: obtaining terminal information of each of the wireless terminal stations by analyzing the transfer signal transmitted from the collection station by the centralized control station. In the terminal information collection method according to claim 4,
the wireless terminal station generating the notification signal from compressed data obtained by compressing the measured terminal information;
The collecting station combines the compressed data of the notification signals transmitted by the respective wireless terminal stations as they are, or combines the compressed data including the decompressed terminal information, and further compresses the combined information. A terminal information collection method, comprising: generating the transfer signal. In the terminal information collection method according to claim 4,
the wireless terminal station generating the notification signal from compressed data obtained by compressing the measured terminal information;
The collecting station combines the compressed data of the notification signals transmitted by the wireless terminal stations as they are, or combines the compressed data including the terminal information decompressed in part, depending on the communication environment of the transfer signal. and generating the transfer signal including the terminal information obtained by decompressing part or all of the compressed data.

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