JP6032852B2 - Communication apparatus, program, method and system for measuring radio link establishment time as communication quality - Google Patents

Description

  The present invention relates to a technology of a communication device capable of measuring communication quality.

  According to the wireless communication system, the “wireless quality” of the wireless terminal is greatly influenced by the surrounding communication environment such as a shield with the base station. For example, a technique for collecting radio quality simply and universally is applied to a radio communication system of a mobile phone network (see, for example, Patent Documents 1 to 3).

  Conventionally, there is a technique of installing a wireless terminal for collecting wireless quality at a necessary location in a service area (see, for example, Patent Document 1). According to this technique, a wireless terminal transmits its wireless quality to a personal computer via a network periodically or as needed. The personal computer transmits the wireless quality corresponding to the position information of the wireless terminal to the area state display device. Thereby, the area state display apparatus can display the wireless quality state according to the area.

  There is also a technique in which a wireless terminal transmits radio area state information of a plurality of different wireless communication systems together with position information to a server via a network (see, for example, Patent Document 2). According to this technique, the wireless terminal has a GPS (Global Positioning System) function and measures its own position information. As a result, the telecommunications carrier operating the server can know the optimum wireless communication system according to the position of the wireless terminal.

  Furthermore, there is a technique for reducing the number of information transmissions or transmission amounts in a mobile phone and reducing the network load by changing the range of radio quality to be acquired according to the type of communication system (see, for example, Patent Document 3). ). According to this technique, only when the acquired wireless quality range is within a predetermined range, positioning is performed by the GPS function, and the position information and the wireless quality are uploaded to a predetermined server.

  According to the techniques described in Patent Documents 1 and 3 described above, “radio quality” means RSCP (Received Signal Code Power) or Ec / No (ratio of RSCP of connected station to total received power). ), Number of retransmissions, data error rate, RSS (Received Signal Strength), C / I (interference wave ratio), Ec / Io (neighboring base station transmission level to current base station transmission level), and the like.

  In addition, the “communication quality” of the wireless terminal in the wireless communication system is greatly influenced not only by the surrounding wireless environment described above but also by the number of users connected to the base station. Particularly for data communication services, the amount of requested data per unit time also becomes a problem.

  For this purpose, there is a technique in which a wireless terminal collects packet transfer throughput and packet transfer delay time and transmits the information to a communication quality monitoring device in the network (see, for example, Patent Document 4). According to this technique, the wireless terminal further transmits the moving speed information of the wireless terminal to the communication quality monitoring apparatus. As a result, the communication quality monitoring apparatus can analyze the communication quality for each movement speed category.

  Furthermore, there is a technique for passively monitoring communication traffic on a TCP (Transmission Control Protocol) connection established between a mobile phone and a server in order to measure communication quality in a wireless section on a network (for example, Patent Documents). 5). According to this technique, it is possible to estimate the packet transfer throughput in the wireless section by capturing and analyzing the traffic.

  In addition, there is a technique for estimating the communication quality of a route by transmitting an ICMP (Internet Control Message Protocol) message to each router on the communication route in the network, as in the Trace route command (see, for example, Patent Document 6). According to this technique, the transmission source host transmits an ICMP message to the router on the route to the destination host, and estimates the QoS level of the route from the delay time value.

JP 2003-032174 A JP 2006-060295 A JP 2008-306240 A Table 2010-055721 JP2013-078011A JP 2004-312725 A

Google developer site, [online], [searched August 26, 2013], Internet <URL: http://developer.android.com/reference/android/telephony/TelephonyManager.html>

According to the above-described conventional technology, the management server collects “wireless quality” and / or “communication quality” according to the position and time zone in the wireless terminal.
“Radio quality”: For example, RSCP, Ec / No, number of retransmissions, data error rate, RSS,
C / I, Ec / Io
"Communication quality": for example, packet transfer throughput, packet transfer delay time

However, in the wireless communication system, unlike the wireless LAN, in the cellular communication system, the wireless link or the wireless bearer is established with the occurrence of communication and released (disconnected) after the end of communication. For example, the sequence is executed in the following steps.
(1) Upon occurrence of communication, the wireless terminal establishes a wireless link with a communication facility device (base station or serving gateway) in the wireless communication system.
(2) The wireless terminal establishes a connection with a predetermined server via a wireless link and the Internet.
(3) The wireless terminal communicates with a predetermined server.
(4) If no data is communicated for a predetermined time, the radio link is released.
(5) When data to be communicated is generated, the wireless link is established again.
(6) The wireless terminal communicates with a predetermined server.

  That is, when the wireless terminal is in a non-communication state, the physical wireless link is disconnected, but the establishment of a logical communication connection is maintained. Therefore, the wireless terminal needs to re-establish a physical wireless link when actually communicating. Such temporary release of the radio link is aimed at effective use of radio resources. Therefore, it is executed with a relatively short no communication time. That is, the wireless terminal needs to execute a wireless link establishment sequence every time communication occurs, except for communication in which data packets are continuously transmitted and received.

  Therefore, the “radio link establishment time” is measured according to the techniques described in Patent Documents 1 to 6 in spite of being an important quality element along with “radio quality” and “communication quality”. I couldn't.

  The “radio link establishment time” varies depending on the radio wave environment between the radio terminal and the base station, the congestion status of the radio access network including the base station and the core network in the radio communication system, and the like. The reason why the radio link establishment time becomes long despite the favorable radio wave environment is considered to be a shortage of resources necessary for radio channel allocation. In this case, it is possible to execute control for eliminating resource shortage such as resource addition.

  Accordingly, an object of the present invention is to provide a communication device, a program, a method, and a system that can easily measure a radio link establishment time from an application layer without changing a physical layer.

According to the present invention, in a communication apparatus having a wireless interface for establishing a wireless link with a communication facility apparatus of a communication carrier network and measuring communication quality,
A radio interface monitoring means for monitoring a radio link state (established / not established) in the radio interface;
A message transmission / reception means for transmitting a request message to a predetermined server via a communication equipment device and receiving a response message from the server;
A round-trip communication time measuring means for measuring a round-trip communication time of a message in the message transmission / reception means;
Round-trip communication time recording means for associating and recording the radio link status of the radio interface and the round-trip communication time;
Using the round-trip communication time recording means, the difference between the first round-trip communication time when the radio link is “not established” and the second round-trip communication time when the radio link is “established” is A radio link establishment time calculating means for calculating the time, and deriving the radio link establishment time as the communication quality.

According to another embodiment of the communication device of the present invention,
The wireless link establishment time calculation means calculates the ratio between the first round-trip communication time in the wireless link “unestablished” state and the second round-trip communication time in the wireless link “established” state, As a percentage,
It is also preferable to derive a required ratio of radio link establishment with respect to radio link establishment time as communication quality.

According to another embodiment of the communication device of the present invention,
The wireless link establishment time calculating means is configured to determine the wireless link based on the communication amount when the first round-trip communication time is measured, the communication amount when the second round-trip communication time is measured, and predetermined communication speed information. It is also preferable to correct the establishment time.

According to another embodiment of the communication device of the present invention,
The message transmission / reception means transmits / receives a message multiple times under a predetermined condition,
The round-trip communication time recording means records the radio link state and round-trip communication time in association with the measurement time of the round-trip communication time of the message,
The wireless link establishment time calculating means preferably calculates using the first round trip communication time and the second round trip communication time that are closest to each other in measurement time.

According to another embodiment of the communication device of the present invention,
The wireless link establishment time calculation means includes a representative value (average value, minimum value, median value or maximum value) in a plurality of first round-trip communication times in the wireless link “established” state within a predetermined time range, and the wireless link It is also preferable to calculate using the second round-trip communication time in the “established” state.

According to another embodiment of the communication device of the present invention,
The round-trip communication time recording means records the radio link state and the round-trip communication time in association with a radio quality value,
It is also preferable that the wireless link establishment time calculating means calculates using the first round trip communication time and the second round trip communication time with which the wireless quality values are closest to each other.

According to another embodiment of the communication device of the present invention,
The radio quality value is
RSCP (Received Signal Code Power)
Ec / No (RSCP of connected station and total received power ratio),
RSS (Received Signal Strength),
C / I (interference wave ratio),
Ec / Io (adjacent base station transmission level vs. current base station transmission level),
RSRP (reference signal received power),
RSRQ (reference signal reception quality),
SNR (signal-to-noise ratio)
It is also preferable to include at least one of

According to another embodiment of the communication device of the present invention,
The message transmission / reception means transmits / receives a message every predetermined unit time,
It is also preferable to further include transmission time interval control means for controlling the setting so that the predetermined unit time becomes longer as the first round-trip communication time, the second round-trip communication time, or the radio link establishment time becomes longer.

According to another embodiment of the communication device of the present invention,
For each base station identifier and / or predetermined time segment, a representative value (average value, minimum value, median or maximum value) of the first round-trip communication time, a representative value of the second round-trip communication time, or a radio link establishment It further has a measurement representative value storage means for storing a representative value of time,
The transmission time interval control means uses the measurement representative value storage means to compare these representative values with the current round-trip communication time or radio link establishment time for each base station identifier and / or predetermined time section, It is also preferable to control the predetermined unit time of the transmission / reception means.

According to the present invention, in a program for causing a computer mounted on a communication device to measure communication quality to have a wireless interface for establishing a wireless link with a communication equipment device of a communication carrier network,
A radio interface monitoring means for monitoring a radio link state (established / not established) in the radio interface;
A message transmission / reception means for transmitting a request message to a predetermined server via a communication equipment device and receiving a response message from the server;
A round-trip communication time measuring means for measuring a round-trip communication time of a message in the message transmission / reception means;
Round-trip communication time recording means for associating and recording the radio link status of the radio interface and the round-trip communication time;
Using the round-trip communication time recording means, the difference between the first round-trip communication time when the radio link is “not established” and the second round-trip communication time when the radio link is “established” is The computer is functioned as a wireless link establishment time calculating means for calculating time, and the wireless link establishment time is derived as communication quality.

According to the present invention, in a method for measuring communication quality using a communication device having a wireless interface for establishing a wireless link with a communication facility device of a communication carrier network,
A first step of monitoring a radio link status (established / unestablished) at the radio interface;
A second step of transmitting a request message to a predetermined server via a communication equipment device and receiving a response message from the server;
A third step of measuring the round-trip communication time of the message in the message transmitting / receiving means;
A fourth step of recording the radio link state of the radio interface and the round-trip communication time in association with each other;
Using the round-trip communication time recording means, the difference between the first round-trip communication time when the radio link is “not established” and the second round-trip communication time when the radio link is “established” is And calculating a radio link establishment time as communication quality.

According to the present invention, in a system having a communication device having a wireless interface that establishes a wireless link with a communication facility device of a carrier network, and a management server for measuring communication quality,
The communication device
A radio interface monitoring means for monitoring a radio link state (established / not established) in the radio interface;
A message transmission / reception means for transmitting a request message to a predetermined server via a communication equipment device and receiving a response message from the server;
A round-trip communication time measuring means for measuring a round-trip communication time of a message in the message transmission / reception means;
Round-trip communication time recording means for associating and recording the radio link status of the radio interface and the round-trip communication time;
Log transmission means for transmitting the wireless link state and the round-trip communication time recorded in the round-trip communication time recording means to the management server every predetermined unit time;
The management server
Radio link establishment time calculation that calculates the difference between the first round trip communication time in the radio link “not established” state and the second round trip communication time in the radio link “established” state as the radio link establishment time Means for deriving a radio link establishment time as communication quality.

  According to another embodiment of the system of the present invention, the log transmission means of the communication device increases the predetermined unit time as the first round-trip communication time, the second round-trip communication time, or the radio link establishment time becomes longer. It is also preferable to control the setting.

  According to the communication apparatus, program, method, and system of the present invention, the radio link establishment time can be easily measured from the application layer without changing the physical layer.

It is a 1st sequence diagram in this invention. It is a 2nd sequence diagram in this invention. It is a 3rd sequence diagram in the present invention. It is a function block diagram of the radio | wireless terminal in this invention. It is explanatory drawing showing the data memorize | stored in the round-trip communication time recording part. It is a functional block diagram of the radio | wireless terminal and management server in this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a first sequence diagram in the present invention.

  Referring to FIG. 1, a wireless terminal (communication device) 1 communicates with a communication equipment device (base station or serving gateway, hereinafter simply referred to as “base station”) 2 of a communication carrier network. It has a radio interface for establishing a link or a radio bearer (hereinafter simply referred to as “radio link”) and can measure communication quality. The wireless terminal is, for example, a mobile phone or a smartphone, and the communication carrier network is, for example, a mobile phone network, and is interconnected to the Internet. The wireless terminal 1 can access the predetermined server 3 via the mobile phone network and the Internet.

First, it is assumed that the wireless terminal 1 has a wireless link state “not established” with respect to the base station 2.
(S111) The application of the wireless terminal 1 transmits, for example, ICMP ECHO. ICMP (Internet Control Message Protocol) is used for information notification in datagram processing of the Internet protocol. ICMP ECHO is sent by the network diagnostic command ping.

(S112) At this time, the radio interface of the radio terminal 1 executes a sequence for establishing a radio link with the base station 2. Thereafter, a time until a wireless link is established between the wireless terminal 1 and the base station 2 is referred to as a “wireless link establishment time”. This radio link establishment time is not visible to the application.

(S113) The wireless interface of the wireless terminal 1 transmits the ICMP ECHO that has been suspended until the wireless link is established via the wireless link. The ICMP ECHO is transmitted to the predetermined server 3 via the mobile phone network and the Internet.
(S114) In response to this, the predetermined server 3 returns ICMP ECHO REPLY. The ICMP ECHO REPLY is transmitted from the base station 2 to the wireless terminal 1 via the wireless link. The wireless interface of the wireless terminal 1 notifies ICMP ECHO REPLY to the application. Accordingly, the application holds the time from the transmission of ICMP ECHO to the reception of ICMP ECHO REPLY as “first round-trip communication time”.

Next, it is assumed that the wireless terminal 1 has a wireless link state of “established” with respect to the base station 2.
(S121) The application of the wireless terminal 1 transmits, for example, ICMP ECHO.
(S122) At this time, the radio interface of the radio terminal 1 transmits ICMP ECHO via a radio link already established with the base station 2. The ICMP ECHO is transmitted to the predetermined server 3 via the mobile phone network and the Internet.
(S123) In response to this, the predetermined server 3 returns ICMP ECHO REPLY. The ICMP ECHO REPLY is transmitted from the base station 2 to the wireless terminal 1 via the wireless link. The wireless interface of the wireless terminal 1 notifies ICMP ECHO REPLY to the application. As a result, the application holds the time from the transmission of ICMP ECHO to the reception of ICMP ECHO REPLY as the “second round-trip communication time”.

(S13) Then, the wireless terminal 1 calculates “radio link establishment time” as follows.
First round-trip communication time (wireless link not established)
-2nd round-trip communication time (radio link establishment state) = "radio link establishment time"

Here, the “wireless link establishment time” is based on the communication amount when the first round-trip communication time is measured, the communication amount when the second round-trip communication time is measured, and predetermined communication speed information. It is also preferable to correct. For example, the correction is performed as follows.
Sz111 [bit]: S111 ICMP ECHO packet size
Sz121 [bit]: ICMP ECHO packet size of S121
R1: Predetermined communication speed in the downlink direction (base station to terminal)
R2: Predetermined communication speed in the uplink direction (direction from terminal to base station) Radio link establishment time after correction = Radio link establishment time-{(Sz111-Sz121) / R1 + (Sz111-Sz121) / R2}
Specifically, it can be calculated as follows.
Calculated radio link establishment time = 50 ms
Sz111 = 100 [bit]
Sz121 = 1000 [bit]
R1 = 5,000,000 [bps]
R2 = 1,000,000 [bps]
Radio link establishment time after correction = 50 ms-{(100-1000) / 5,000,000 + (100-1000) / 1,000,000}
= 50ms-{-1.08ms} = 51.08ms

  FIG. 2 is a second sequence diagram in the present invention.

First, it is assumed that the wireless terminal 1 has a wireless link state “not established” with respect to the base station 2.
(S211) The application of the wireless terminal 1 transmits an HTTP GET message, for example.
(S212) At this time, the radio interface of the radio terminal 1 executes a sequence for establishing a radio link with the base station 2. The “radio link establishment time” until the radio link is established between the radio terminal 1 and the base station 2 is not visible from the application.

(S213) After establishing the radio link, the TCP layer of the radio terminal 1 transmits a TCP SYN via the radio link. The TCP SYN is transmitted to the predetermined server 3 via the mobile phone network and the Internet.
(S214) In response, the predetermined server 3 returns a TCP SYN + ACK. The TCP SYN + ACK is transmitted from the base station 2 to the wireless terminal 1 via the wireless link. The wireless interface of the wireless terminal 1 notifies TCP SYN + ACK to the TCP layer.
(S215) On the other hand, the TCP layer of the wireless terminal 1 transmits a TCP ACK via the wireless link. The TCP ACK is transmitted to the predetermined server 3 via the mobile phone network and the Internet.

(S216) Next, the TCP layer of the wireless terminal 1 transmits the HTTP GET held until the wireless link is established via the wireless link. The HTTP GET is transmitted to the predetermined server 3 via the mobile phone network and the Internet.
(S217) In response to this, the predetermined server 3 returns a TCP ACK. The TCP ACK is transmitted from the base station 2 to the wireless terminal 1 via the wireless link. The wireless interface of the wireless terminal 1 notifies TCP ACK to the TCP layer.

(S218) The predetermined server 3 returns HTTP 200OK. The HTTP 200OK is transmitted from the base station 2 to the wireless terminal 1 via a wireless link. The wireless interface of the wireless terminal 1 notifies HTTP 200OK to the application via the TCP layer. As a result, the application holds the time from the transmission of HTTP GET to the reception of HTTP 200OK as the “first round-trip communication time”.

Next, the wireless terminal 1 assumes that the wireless link state for the base station 2 is “established”.
(S221) The application of the wireless terminal 1 transmits, for example, HTTP GET.
(S222) At this time, the TCP layer of the wireless terminal 1 transmits a TCP SYN via the wireless link already established with the base station 2. The TCP SYN is transmitted to the predetermined server 3 via the mobile phone network and the Internet.
(S223) In response to this, the predetermined server 3 returns a TCP SYN + ACK. The TCP SYN + ACK is transmitted from the base station 2 to the wireless terminal 1 via the wireless link. The wireless interface of the wireless terminal 1 notifies TCP SYN + ACK to the TCP layer.
(S224) On the other hand, the TCP layer of the wireless terminal 1 transmits a TCP ACK via the wireless link. The TCP ACK is transmitted to the predetermined server 3 via the mobile phone network and the Internet.

(S225) Next, the TCP layer of the wireless terminal 1 transmits HTTP GET via the wireless link. The HTTP GET is transmitted to the predetermined server 3 via the mobile phone network and the Internet.
(S226) In response to this, the predetermined server 3 returns a TCP ACK. The TCP ACK is transmitted from the base station 2 to the wireless terminal 1 via the wireless link. The wireless interface of the wireless terminal 1 notifies TCP ACK to the TCP layer.
(S227) Further, the predetermined server 3 returns HTTP 200OK. The HTTP 200OK is transmitted from the base station 2 to the wireless terminal 1 via a wireless link. The wireless interface of the wireless terminal 1 notifies HTTP 200OK to the application via the TCP layer. As a result, the application holds the time from the transmission of HTTP GET to the reception of HTTP 200OK as the “second round-trip communication time”.

(S23) Then, the wireless terminal 1 calculates “radio link establishment time” as follows.
First round-trip communication time (wireless link not established)
-2nd round-trip communication time (radio link establishment state) = "radio link establishment time"

  FIG. 3 is a third sequence diagram in the present invention.

  According to FIG. 3, this is a sequence that is actually performed and is based on the sequence of FIG. According to FIG. 3, the sequence of the radio link non-established state (S211 to S218) and the sequence of the radio link established state (S221 to S227) are successively executed for the sequence of FIG. From the viewpoint of the application, it can be processed as follows.

First, the radio link status of the radio interface is confirmed as “established” or “not established”. If the wireless link is “established”, the confirmation of the wireless link state is repeated until the wireless link is “not established”. Then, when the wireless link is in an “unestablished” state, an HTTP GET (request message) is transmitted to the predetermined server 3 and an HTTP 200 OK (response message) is received to measure the first round-trip communication time.
Here, the radio link state is confirmed again. If the wireless link is “established”, the second round trip delay time is measured by transmitting HTTP GET to the predetermined server 3 again and receiving HTTP 200OK.
In this way, the radio link establishment time can be easily measured by simply exchanging messages twice.

  FIG. 4 is a functional configuration diagram of the wireless terminal according to the present invention.

  According to FIG. 4, the wireless terminal (communication device) 1 includes a wireless interface unit 101, a TCP layer unit 102, a wireless interface monitoring unit 11, a message transmission / reception unit 12, a round-trip communication time measurement unit 13, and a round-trip communication. It has a time recording unit 14, a radio link establishment time calculation unit 15, a measurement representative value storage unit 16, a transmission time interval control unit 17, and a log transmission unit 19. These functional components are realized by executing a program that causes a computer mounted on the communication device to function. Also, the flow of processing of these functional components can be understood as a method.

[Wireless interface monitoring unit 11]
The radio interface monitoring unit 11 monitors the radio link state (established / not established) in the radio interface. For example, according to Android (registered trademark), which is a platform developed by Google Inc., API (Application Programming Interface) that provides the following five wireless link states for a wireless interface is prepared (see Non-Patent Document 1). .
"DATA_ACTIVITY_DORMANT": Radio link not established
"DATA_ACTIVITY_NONE": Radio link establishment status
"DATA_ACTIVITY_IN": Radio link establishment status
"DATA_ACTIVITY_OUT": Radio link establishment status
“DATA_ACTIVITY_INOUT”: Radio link establishment state The radio interface monitoring unit 11 records the radio link status in the round trip time recording unit 14 together with the round trip time output from the round trip communication time measuring unit 13.

The radio interface monitoring unit 11 preferably also measures the radio quality value of the radio link of the radio interface unit 101. Examples of the radio quality value include the following.
RSCP (Received Signal Code Power)
Ec / No (RSCP of connected station and total received power ratio),
RSS (Received Signal Strength),
C / I (interference wave ratio),
Ec / Io (adjacent base station transmission level vs. current base station transmission level),
RSRP (reference signal received power),
RSRQ (reference signal reception quality),
SNR (signal-to-noise ratio)
The measured wireless quality value is also recorded in the round-trip communication time recording unit 14 together with the wireless link state.

[Message Transmission / Reception Unit 12]
The message transmission / reception unit 12 transmits a request message to the predetermined server 3 via the base station 2 and receives a response message from the server 3. The request message is, for example, ICMP ECHO or HTTP GET, and the response message is ICMP ECHO REPLY or HTTP 200OK corresponding thereto (see FIGS. 1 to 3). Of course, other messages may be used, but a response message to the request message needs to be returned immediately.

  The message transmission / reception unit 12 transmits / receives a message a plurality of times under a predetermined condition. The predetermined condition may be, for example, every predetermined unit time. The predetermined unit time can be changed by an instruction from the transmission time interval control unit 17, for example.

[Round-trip communication time measurement unit 13]
The round-trip communication time measurement unit 13 measures the round-trip communication time of the message in the message transmission / reception unit 12. The round-trip communication time and the measurement time are recorded in the round-trip communication time recording unit 14 together with the radio link state from the radio interface monitoring unit 11.

[Round-trip communication time recording unit 14]
The round-trip communication time recording unit 14 records the radio link state of the radio interface and the round-trip communication time in association with each other. The round trip communication time recording unit 14 also records the measurement time and the radio quality value in association with the radio link state and the round trip communication time.

  FIG. 5 is an explanatory diagram showing data stored in the round-trip communication time recording unit.

  According to the round-trip communication time recording unit 14 in FIG. 5, the measurement time, the radio link state, the round-trip communication time, and the radio quality value are recorded in association with each other.

[Radio link establishment time calculation unit 15]
The wireless link establishment time calculation unit 15 uses the round-trip communication time recording unit 14 to perform a first round-trip communication time when the radio link is “not established” and a second round-trip communication when the radio link is “established”. The difference from the communication time is calculated as the radio link establishment time (see S13 in FIG. 1, S23 in FIG. 2, and S33 in FIG. 3).

Here, it is preferable that the radio link establishment time calculation unit 15 selects the first round trip communication time and the second round trip communication time by any of the following methods.
(Selection method 1) The first round trip communication time and the second round trip communication time at which the measurement times are closest to each other are selected. According to FIG. 5, the radio link establishment time of 160 ms is calculated from the difference between the round-trip communication time of 280 ms in the radio link “not established” state and the round-trip communication time of 120 ms in the radio link “established” state.

(Selection method 2) The first round trip communication time and the second round trip communication time at which the wireless quality values are closest to each other are selected. According to FIG. 5, the radio quality value SNR [10.2] measured at time [11: 25: 36.6] as the record closest to the radio quality value SNR [10.1 dB] measured at time [11: 22: 34.6]. dB] is selected. Then, a radio link establishment time of 170 ms is calculated from the difference between the first round-trip communication time 280 ms at time [11: 22: 34.6] and the second round-trip communication time 110 ms at time [11: 25: 36.6]. .

As another embodiment, the radio link establishment time calculation unit 15 calculates a first round-trip communication time when the radio link is “not established” and a second round-trip communication time when the radio link is “established”. The ratio may be calculated as a “radio link establishment required ratio”.
Wireless link establishment required ratio =
Second round-trip communication time /
First round-trip communication time when radio link is not established Large radio link establishment required ratio-> Backhaul side round-trip delay time is long Radio link establishment required ratio is small-> Radio link establishment time is long

[Measurement representative value storage unit 16]
The measurement representative value storage unit 16 includes, for each base station identifier and / or predetermined time interval, a representative value (average value, minimum value, median value, or maximum value) of the first round-trip communication time, and the second round-trip communication time. The representative value or the representative value of the radio link establishment time is stored. The measurement representative value storage unit 16 is referred to by the transmission time interval control unit 17.

According to FIG. 5, the wireless link “not established” state is confirmed at time [11: 22: 34.6], and the round-trip communication time 280 ms is measured. Thereafter, assuming that the predetermined time range is 5 minutes, it is assumed that five wireless link “established” states are confirmed and the round-trip communication time is measured. At this time, a representative value (for example, minimum value, median value, average value, maximum value, predetermined percentage value) of these five round-trip communication time values is set as the round-trip communication time in the wireless link “established” state. Assuming that the representative value is an average value, according to FIG. 5, the representative value of the five round-trip communication times in the wireless link “established” state is 128 ms. In this case, the radio link establishment time is calculated as follows.
280ms−128ms = 152ms (wireless link establishment time)

[Transmission time interval control unit 17]
The transmission time interval control unit 17 controls the setting so that the predetermined unit time becomes longer as the first round-trip communication time, the second round-trip communication time, or the radio link establishment time becomes longer. Specifically, the transmission time interval control unit 17 uses the measurement representative value storage unit 16 to determine these representative values and the current round-trip communication time or radio link establishment time for each base station identifier and / or predetermined time interval. And compare. Then, the transmission time interval control unit 17 changes the transmission timing of the request message to the message transmission / reception unit 12. Specifically, the control is performed as follows.
Large representative value-> Increase message transmission time interval (reduce transmission frequency)
Typical value is small-> shorten the message transmission time interval (increase the transmission frequency)
This means that the representative value is large for each base station identifier and / or predetermined time interval means that network resources are congested. In such a mixture, the exchange of messages for measuring the radio link establishment time prevents further use of network resources.

  The wireless link establishment time calculation unit 15 described above also has representative values (average value, minimum value, median value, or maximum value) in a plurality of first round-trip communication times in the wireless link “established” state within a predetermined time range. ) And the second round-trip communication time in the radio link “established” state.

[Communication quality collection unit 18]
The communication quality collection unit 18 collects “radio link establishment time” and / or “radio link establishment required ratio” as communication quality.

  FIG. 6 is a functional configuration diagram of the wireless terminal and the management server in the present invention.

  According to FIG. 6, compared with FIG. 4, the management server 4 is connected to the Internet. In FIG. 4, the wireless terminal 1 collects communication quality, whereas in FIG. 6, the management server 4 collects communication quality. According to FIG. 6, the wireless terminal 1 further includes a log transmission unit 19 that transmits the log of the round-trip communication time recording unit 14 to the management server 4. Further, the wireless terminal 1 does not include the wireless link establishment time calculation unit 15 and the communication quality collection unit 18. On the other hand, the management server 4 includes a round-trip communication time recording unit 14, a radio link establishment time calculation unit 15, and a communication quality collection unit 18.

  The log transmission unit 19 of the wireless terminal 1 transmits the round-trip communication time recorded in the round-trip communication time recording unit 14 to the management server 4 every predetermined unit time. Further, in response to an instruction from the transmission time interval control unit 17, the log transmission unit 19 increases the predetermined unit time as the first round-trip communication time, the second round-trip communication time, or the radio link establishment time increases. To control the settings. Accordingly, when the network resource is congested, the use of the network resource is prevented as much as possible by reducing the log transmission frequency.

  As described above in detail, according to the communication apparatus, program, method, and system of the present invention, the radio link establishment time can be easily measured from the application layer without changing the physical layer. As a result, when the radio link establishment time becomes long despite the radio wave environment being good, it is possible to add resources necessary for radio channel allocation and execute control to eliminate the resource shortage.

  Various changes, modifications, and omissions of the above-described various embodiments of the present invention can be easily made by those skilled in the art. The above description is merely an example and is not intended to be restrictive. The invention is limited only as defined in the following claims and the equivalents thereto.

DESCRIPTION OF SYMBOLS 1 Radio | wireless terminal, communication apparatus 10 Radio | wireless interface part 11 Radio | wireless interface monitoring part 12 Message transmission / reception part 13 Round-trip communication time measurement part 14 Round-trip communication time recording part 15 Radio | wireless link establishment time calculation part 16 Measurement representative value memory | storage part 17 Transmission time interval control part 18 Communication quality collection unit 19 Log transmission unit 2 Base station 3 Predetermined server 4 Management server

Claims (13)

In a communication device having a wireless interface for establishing a wireless link with a communication facility device of a communication carrier network and measuring communication quality,
A radio interface monitoring means for monitoring a radio link state (established / not established) in the radio interface;
A message transmission / reception means for transmitting a request message to a predetermined server via the communication facility device and receiving a response message from the server;
Round-trip communication time measuring means for measuring round-trip communication time of the message in the message transmitting and receiving means;
Round-trip communication time recording means for recording the radio link state of the radio interface and the round-trip communication time in association with each other;
Using the round-trip communication time recording means, the difference between the first round-trip communication time when the radio link is “unestablished” and the second round-trip communication time when the radio link is “established” is A communication apparatus, comprising: a wireless link establishment time calculation means for calculating as an establishment time, and deriving a wireless link establishment time as a communication quality. The wireless link establishment time calculation means calculates the ratio of the first round-trip communication time in the wireless link “unestablished” state and the second round-trip communication time in the wireless link “established” state, As a required percentage,
The communication apparatus according to claim 1, wherein a wireless link establishment required ratio with respect to a wireless link establishment time is derived as communication quality.   The wireless link establishment time calculating means is based on the communication amount when measuring the first round-trip communication time, the communication amount when measuring the second round-trip communication time, and predetermined communication speed information. The communication apparatus according to claim 1, wherein the wireless link establishment time is corrected. The message transmission / reception means transmits / receives the message a plurality of times under a predetermined condition,
The round-trip communication time recording means records the radio link state and the round-trip communication time in association with the measurement time of the round-trip delay time of the message,
4. The wireless link establishment time calculation means calculates the first round trip communication time and the second round trip communication time at which the measurement times are closest to each other. 5. Item 1. The communication device according to item 1. The wireless link establishment time calculation means includes a representative value (average value, minimum value, median value or maximum value) in a plurality of first round-trip communication times in a wireless link “established” state within a predetermined time range, The communication apparatus according to claim 4, wherein calculation is performed using the second round-trip communication time in the link “established” state. The round-trip communication time recording means further records a radio quality value in association with the radio link state and the round-trip communication time,
4. The wireless link establishment time calculation means calculates the first round-trip communication time and the second round-trip communication time when the wireless quality values are closest to each other. 5. The communication apparatus according to claim 1. The radio quality value is
RSCP (Received Signal Code Power)
Ec / No (RSCP of connected station and total received power ratio),
RSS (Received Signal Strength),
C / I (interference wave ratio),
Ec / Io (adjacent base station transmission level vs. current base station transmission level),
RSRP (reference signal received power),
RSRQ (reference signal reception quality),
SNR (signal-to-noise ratio)
The communication device according to claim 6, comprising at least one of the following. The message transmitting / receiving means transmits and receives the message every predetermined unit time,
The apparatus further comprises transmission time interval control means for controlling the setting so that the predetermined unit time becomes longer as the first round-trip communication time, the second round-trip communication time, or the radio link establishment time becomes longer. Item 8. The communication device according to any one of Items 1 to 7. For each base station identifier and / or predetermined time interval, a representative value (average value, minimum value, median or maximum value) of the first round-trip communication time, a representative value of the second round-trip communication time, or the radio link It further has a measurement representative value storage means for storing a representative value of the establishment time,
The transmission time interval control means uses the measured representative value storage means to compare the representative value with the current round-trip communication time or radio link establishment time for each base station identifier and / or predetermined time interval. 9. The communication apparatus according to claim 8, wherein a predetermined unit time of the message transmitting / receiving means is controlled. In a program that has a wireless interface that establishes a wireless link with a communication facility device of a telecommunications carrier network and functions a computer mounted on a communication device that measures communication quality,
A radio interface monitoring means for monitoring a radio link state (established / not established) in the radio interface;
A message transmission / reception means for transmitting a request message to a predetermined server via the communication facility device and receiving a response message from the server;
Round-trip communication time measuring means for measuring round-trip communication time of the message in the message transmitting and receiving means;
Round-trip communication time recording means for recording the radio link state of the radio interface and the round-trip communication time in association with each other;
Using the round-trip communication time recording means, the difference between the first round-trip communication time when the radio link is “unestablished” and the second round-trip communication time when the radio link is “established” is A program for causing a computer to function as a wireless link establishment time calculating means for calculating as an establishment time and deriving a wireless link establishment time as communication quality. In a method of measuring communication quality using a communication device having a wireless interface for establishing a wireless link with a communication facility device of a communication carrier network,
A first step of monitoring a radio link status (established / not established) in the radio interface;
A second step of transmitting a request message to a predetermined server via the communication equipment and receiving a response message from the server;
A third step of measuring a round-trip communication time of the message in the message transmitting / receiving means;
A fourth step of associating and recording the radio link state of the radio interface and the round-trip communication time;
Using the round-trip communication time recording means, the difference between the first round-trip communication time when the radio link is “unestablished” and the second round-trip communication time when the radio link is “established” is And a fifth step of calculating as an establishment time, and deriving a radio link establishment time as communication quality. In a system having a communication device having a wireless interface for establishing a wireless link with a communication facility device of a communication carrier network and a management server for measuring communication quality,
The communication device
A radio interface monitoring means for monitoring a radio link state (established / not established) in the radio interface;
A message transmission / reception means for transmitting a request message to a predetermined server via the communication facility device and receiving a response message from the server;
Round-trip communication time measuring means for measuring round-trip communication time of the message in the message transmitting and receiving means;
Round-trip communication time recording means for recording the radio link state of the radio interface and the round-trip communication time in association with each other;
Log transmission means for transmitting the wireless link state and the round-trip communication time recorded in the round-trip communication time recording means to the management server every predetermined unit time;
The management server
Radio link establishment time calculation that calculates the difference between the first round trip communication time in the radio link “not established” state and the second round trip communication time in the radio link “established” state as the radio link establishment time And a system for deriving a radio link establishment time as communication quality.   The log transmission unit of the communication device controls the setting so that the predetermined unit time is increased as the first round-trip communication time, the second round-trip communication time, or the wireless link establishment time is increased. The system of claim 12.

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