JP2019062368A - Base station device, transmission method, and program - Google Patents

Abstract

To provide a technique of reducing an impact of delay on communication quality even when an unexpected delay occurs.SOLUTION: A first acquisition unit 32 acquires first data from a terminal device. A second acquisition unit 38 acquires second data from a control device. A determination unit 34 compares quality of the first data acquired by the first acquisition unit 32 with quality of the second data acquired by the second acquisition unit 38. A radio transmission unit 44 transmits at least a part of data with better quality of the first data and second data on the basis of a comparison result of the determination unit 34.SELECTED DRAWING: Figure 5

Description

  The present invention relates to communication technology, and more particularly to a base station apparatus for transmitting data, a transmission method, and a program.

  All base stations in a mobile communication system may be operated at a common frequency. When packet signals transmitted from one terminal apparatus are received by a plurality of base station apparatuses, the control station connected to the upper layer of each base station apparatus has quality among packet signals transmitted from a plurality of base station apparatuses Packets are selected and transmitted to the network (eg, Patent Document 1).

Japanese Patent Laid-Open No. 2002-335582

  In such processing, processing based on the pre-measurement results between base station apparatuses is performed. However, in the prior art, the network delay between the base station apparatus and the control station is not taken into consideration. For example, when the base station apparatus is connected to an IP (Internet Protocol) network, in the IP network, a delay that is difficult to predict and measure in real time and quantitatively occurs. Even if the quality of a packet signal sent from a certain base station apparatus is high, if a significant network delay occurs, the data may not reach the control station and may not be selected by the control station. In such a case, the control station may not be able to select the best quality packet, and the communication quality may be degraded. Even when such a delay that is difficult to predict and measure in real time and quantitatively occurs, the influence of the delay is required to be suppressed.

  The present invention has been made in view of these circumstances, and an object thereof is to provide a technique for reducing the influence of delay on communication quality even when an unexpected delay occurs.

  In order to solve the above problems, a base station apparatus according to an aspect of the present invention includes a first acquisition unit that acquires first data from a terminal apparatus, a second acquisition unit that acquires second data from a control apparatus, and The first data and the second data based on the comparison result of the determination unit that compares the quality of the first data acquired in the first acquisition unit with the quality of the second data acquired in the second acquisition unit, And a transmitter configured to transmit at least a part of the higher quality one.

  Another aspect of the present invention is a transmission method. The method includes the steps of acquiring first data from a terminal device, acquiring second data from the control device, and comparing the quality of acquired first data with the quality of acquired second data. And transmitting at least a portion of the first data and the second data of higher quality based on the comparison result.

  Note that arbitrary combinations of the above-described components, and conversions of the expression of the present invention among methods, apparatuses, systems, recording media, computer programs and the like are also effective as aspects of the present invention.

  According to the present invention, even when an unexpected delay occurs, the influence of the delay on communication quality can be reduced.

It is a figure showing composition of a communications system concerning an example. It is a figure which shows the outline | summary of the process by the communication system of FIG. It is a figure which shows the outline | summary of the transmission process by the communication system of FIG. It is a figure which shows the outline | summary of the process assumed when the delay of IP network generate | occur | produces in the communication system of FIG. It is a figure which shows the structure of the base station apparatus of FIG. It is a figure which shows the data structure of the data memorize | stored in the 1st acquisition part of FIG. It is a figure which shows the data structure of the packet signal transmitted from the communication part of FIG. It is a figure which shows the structure of the control apparatus of FIG. It is a figure which shows the data structure of the data memorize | stored in the packet signal buffer part of FIG. It is a figure which shows the data structure of the packet signal transmitted from the communication part of FIG. It is a figure which shows the data structure of the data memorize | stored in the 2nd acquisition part of FIG. It is a flowchart which shows the transmission processing by the base station apparatus of FIG. It is a figure which shows arrangement | positioning of the communication area in the communication system of FIG. It is a figure which shows the data structure of the transmission power setting table memorize | stored in the determination part of FIG. It is a figure which shows arrangement | positioning of the communication area in the case of FIG. It is a figure which shows the data structure of another transmission power setting table memorize | stored in the base station information control apparatus based on an Example.

  Before specifically explaining the present invention, an outline will be given first. An embodiment of the present invention relates to a communication system including a plurality of terminal devices communicating with each other via a base station device. The communication system corresponds to, for example, a business wireless system. Also, the uplink frequency (hereinafter referred to as "uplink frequency") from the terminal apparatus to the base station apparatus is different from the downlink frequency (hereinafter referred to as "downlink frequency") from the base station apparatus to the terminal apparatus. The uplink frequency corresponds to the reception frequency in the base station apparatus, and the downlink frequency corresponds to the transmission frequency in the base station apparatus. On the other hand, the uplink frequency in each of the plurality of base station apparatuses is the same, and the downlink frequency in each of the plurality of base station apparatuses is also the same. Hereinafter, a combination of one upstream frequency and one downstream frequency may be referred to as a “channel”, but one of the upstream frequency or the downstream frequency may be referred to as a “channel”. The plurality of base station devices are connected to the control device, and the control device controls each base station device, and when the base station device receives calling information (transmission information) from the terminal device, the plurality of base station devices are connected. The received call information is transferred to the base station apparatus. This corresponds to performing simulcast communication across a plurality of base station apparatuses.

  One terminal device transmits call origination information including voice information. Each of the plurality of base station apparatuses having received the calling information generates a packet signal by IP packetizing the calling information, and transmits the packet signal to the control apparatus through the IP network. At that time, the base station apparatus also stores information on the quality of the received outgoing call information (hereinafter referred to as "quality information") in the packet signal. The control device compares the quality information in the packet signal received from each of the plurality of base station devices, and selects the call information of the packet signal containing the highest quality information. The control device generates a packet signal including information (hereinafter referred to as “transmission time”) related to the time at which each of a plurality of base station apparatuses should transmit the selected calling information, and the calling information. The control device transmits packet signals to the plurality of base station devices via the IP network. When receiving the packet signal, the plurality of base station apparatuses transmit the calling information when the transmission time included in the packet signal comes. The plurality of terminal devices receive call origination information and reproduce voice. Such processing is periodically repeated and continued as long as the utterance of the user using one terminal device continues.

  When a delay occurs in one of the paths from each of a plurality of base station apparatuses to the control apparatus, reception of a packet signal from one base station apparatus is not in time for selection of call origination information in the control apparatus There is also. At that time, the control device selects the calling information included in one of the remaining packet signals and executes the above-mentioned processing. When receiving the packet signal from the control device, the one base station apparatus transmits the calling information included in the packet signal, but the received calling signal is higher than the quality of the calling information included in the packet signal. The quality of the information may be higher. That is, a situation occurs in which transmission information of lower quality than the quality of the received transmission information is transmitted.

  In this embodiment, the base station apparatus has the highest quality calling information in the highest possible range, in case the packet signal from one base station apparatus is not properly received by the control apparatus due to the delay of the IP network. Means are provided which allow transmission. Each base station apparatus stores, in a buffer, call origination information included in a packet signal to be transmitted to the control apparatus. In addition, each base station apparatus compares the quality of stored calling information with the quality of calling information included in the packet signal from the control apparatus, and if the former is higher than the latter, the stored calling is stored. Send information

  FIG. 1 shows the configuration of the communication system 100. The communication system 100 includes an IP network 10, a control apparatus 12, and a first base station apparatus 14a collectively referred to as a base station apparatus 14, a second base station apparatus 14b, a third base station apparatus 14c, and a third terminal apparatus 16 collectively. First terminal device 16a, second terminal device 16b, third terminal device 16c, first synchronization control reference device 20a collectively referred to as synchronization control reference device 20, second synchronization control reference device 20b, third synchronization control A reference device 20c and a fourth synchronization control reference device 20d are included. Here, the number of base station devices 14 included in the communication system 100 is not limited to “3”, and the number of terminal devices 16 is not limited to “3”, and may be more than these. It is also good.

  As described above, the plurality of terminal devices 16 and the plurality of base station devices 14 correspond to a business wireless system, and each terminal device 16 performs voice communication via one or more base station devices 14. Do. Each terminal device 16 is provided with a PTT (Push To Talk) button, and the terminal device 16 with the PTT button pressed transmits the voice of the user as calling information to the base station device 14. When receiving the calling information from the terminal device 16, the plurality of base station devices 14 generate a packet signal including the calling information, and transmit the packet signal to the control device 12 via the IP network 10. At that time, the plurality of base station apparatuses 14 measure the reception sensitivity (RSSI: Received Signal Strength Indicator), the error rate of the calling information, and the like as the quality of the calling information, and the quality information as the measurement result is also converted to a packet signal. include.

  The control device 12 receives packet signals from the plurality of base station apparatuses 14 and, based on the quality information included in each packet signal, selects call information of the packet signal including the highest quality information. Further, the control device 12 generates a transmission time for the selected calling information, and transmits a packet signal including the transmission time and the calling information to the plurality of base station apparatuses 14 via the IP network 10. . Here, the fourth synchronization control reference device 20d is connected to the control device 12, and the fourth synchronization control reference device 20d is, for example, a high precision NTP (Network Time Protocol) server, a GPS (Global Positioning System), or the like. ) A receiver. The fourth synchronization control reference device 20d generates a reference time (hereinafter referred to as "reference time"), and the control device 12 generates a transmission time based on the reference time.

  When receiving the packet signal, the plurality of base station apparatuses 14 extract transmission time and calling information from the packet signal. The synchronization control reference device 20 is also connected to each base station device 14, and the base station device 14 transmits calling information when the reference time obtained from the synchronization control reference device 20 passes the transmission time. Do. Here, since the first synchronization control reference device 20a to the fourth synchronization control reference device 20d are synchronized, the first base station apparatus 14a to the third base station apparatus 14c have the same timing for calling information. Send by Therefore, it can be said that the communication system 100 is a simulcast system. The terminal device 16 receives call information from the base station device 14.

  FIG. 2 shows an outline of processing by the communication system 100. In the packet signal transmitted from the first base station apparatus 14a to the control apparatus 12 via the IP network 10 from the third base station apparatus 14c, the calling information and the base station apparatus 14 received the calling information from the terminal apparatus 16 Includes call reception time. The control device 12 stores the packet signal received from each base station apparatus 14 in the buffer, and the same calling information is transmitted to each of the packet signals included in the fixed period of several milliseconds when the call reception time in the packet signal is several milliseconds. Considered included. The control device 12 selects the highest quality calling information from among a plurality of calling information considered to be the same calling information.

  The control device 12 generates a packet signal including the selected calling information and transmission time, and transmits the packet signal from the first base station device 14a to the third base station device 14c via the IP network 10. The transmission time is set for the purpose of matching the transmission timing in all the base station apparatuses 14, and therefore, the transmission time is set to the same value for all the base station apparatuses 14. Further, the transmission time is a value in consideration of the delay time of the IP network 10.

  FIG. 3 shows an outline of transmission processing by the communication system 100. The controller 12 transmits a packet signal N to a packet signal N + 5 from the packet signal N to the base station apparatus 14 at regular intervals. After storing in each buffer, the base station apparatus 14 extracts the transmission time included in the packet signal, and when the reference time obtained from the synchronization control reference apparatus 20 arrives at the transmission time, the calling information is received. Send. Therefore, the calling information N to the calling information N + 5 are transmitted at regular intervals from the calling information N included in each of the packet signal N to the packet signal N + 5.

  FIG. 4 shows an outline of processing assumed when a delay occurs in the IP network in the communication system 100. As described above, in the IP network 10, unexpected network delay may occur in nature. This network delay depends on the installation state of the line (best effort / guarantee etc.) and the use state of traffic, and it is extremely difficult to predict quantitatively. Therefore, when an unexpected network delay occurs after each base station apparatus 14 transmits a packet signal to the control apparatus 12, the control apparatus 12 can not normally receive the packet signal. The packet signal transmitted from the third base station apparatus 14 c is in a state where it does not arrive at the control apparatus 12 within a fixed period due to network delay. Therefore, only the packet signals from the first base station apparatus 14a and the second base station apparatus 14b are targeted for the quality evaluation of the outgoing call information in the control apparatus 12.

  Here, it is assumed that the quality of the calling information received by each base station apparatus 14 from the terminal apparatus 16 is the highest in the third base station apparatus 14 c and the lowest in the first base station apparatus 14 a. However, since the call origination information from the third base station apparatus 14 c is not the subject of evaluation, each base station apparatus 14 receives the third call from the third base station apparatus 14 c despite the highest quality of call origin information. The call origination information from the two base station apparatuses 14b is distributed. As a result, each base station apparatus 14 transmits calling information having the highest quality.

  Although the present embodiment for coping with this will be described, here (1) reception processing in the base station apparatus 14, (2) selection processing in the control apparatus 12, (3) base according to the time series of processing. The transmission process in the station device 14 will be described in order.

(1) Reception Processing in Base Station Apparatus 14 FIG. 5 shows the configuration of the base station apparatus 14. The base station apparatus 14 includes a wireless reception unit 30, a first acquisition unit 32, a determination unit 34, a communication unit 36, a second acquisition unit 38, a detection unit 40, a control unit 42, and a wireless transmission unit 44. The detection unit 40 is connected to the synchronization control reference device 20 of FIG. 1 and sequentially acquires reference times from the synchronization control reference device 20. The wireless reception unit 30 receives a signal from the terminal device 16 by executing a reception process corresponding to the business wireless system. Here, when receiving the calling information from one terminal device 16, the wireless reception unit 30 acquires the reference time from the detection unit 40 as the call reception time. The calling information includes voice information. Also, the wireless reception unit 30 generates a packet signal so as to include the call reception time and the calling information. Here, the packet signal is generated, for example, in units of 100 milliseconds. The wireless reception unit 30 outputs the packet signal to the first acquisition unit 32.

  The determination unit 34 determines the quality of the calling information included in the packet signal received by the first acquisition unit 32. As described above, the RSSI, the error rate or the like is used as an index indicating the quality of the outgoing call information. The determination unit 34 outputs the measurement result as quality information to the first acquisition unit 32. The first acquisition unit 32 acquires a packet signal from the wireless reception unit 30, and acquires, from the determination unit 34, quality information of calling information included in the packet signal. The first acquisition unit 32 stores the packet signal after the quality information is also included in the packet signal. Therefore, the first acquisition unit 32 can be said to be a transmission packet signal buffer unit.

  FIG. 6 shows the data structure of data stored in the first acquisition unit 32. As shown in FIG. The call reception time indicates the time information when the calling information from the terminal device 16 is received, and the calling information and quality information from the terminal device 16 are recorded in the data area. The first acquisition unit 32 can store a fixed number (for example, 5) of packet signals, and when adding a new packet signal in a state where the number of buffers reaches the upper limit, a packet signal with an old call reception time starts Delete in order. Here, when a packet signal with a call reception time of “10: 10: 32: 502” is newly added, the No. 1 call reception time of which is “10: 10: 32: 002”. The 01 packet signal is deleted. Return to FIG.

  The first acquisition unit 32 outputs the additionally written packet signal to the communication unit 36. The communication unit 36 receives the packet signal from the first acquisition unit 32. The communication unit 36 is connected to the IP network 10 of FIG. 1 and transmits a packet signal to the control device 12 via the IP network 10. It can be said that the communication unit 36 that executes such transmission processing is a transmission unit. FIG. 7 shows a data structure of a packet signal transmitted from the communication unit 36. As shown, the call reception time, the calling information, and the quality information are included. The description of the other components in FIG. 5 will be described later.

(2) Selection Process in Control Device 12 FIG. 8 shows the configuration of the control device 12. The control device 12 includes a communication unit 50, a packet signal buffer unit 52, a determination unit 54, a detection unit 56, and a packet signal distribution unit 58. The communication unit 50 is connected to an IP network 10 (not shown), and receives packet signals from the base station apparatuses 14 via the IP network 10. The communication unit 50 outputs the packet signal to the packet signal buffer unit 52.

  The detection unit 56 is connected to the synchronization control reference device 20 of FIG. 1 and sequentially acquires reference times from the synchronization control reference device 20. The packet signal buffer unit 52 receives a packet signal from the communication unit 50 and receives from the detection unit 56 a reference time at which the packet signal is received. The packet signal buffer unit 52 stores the packet signal received from the communication unit 50. FIG. 9 shows the data structure of data stored in the packet signal buffer unit 52. As shown in FIG. The transmission source base station name stores the name of the base station apparatus 14 that has transmitted the packet signal, and the packet signal reception time indicates the time when the controller 12 receives the packet signal, and the call reception time and data area The contents of the packet signal are recorded as they are. Return to FIG.

  The packet signal distribution unit 58 refers to the call reception time in the packet signal stored in the packet signal buffer unit 52, and transmits a packet signal of call origination information not identical to call origination information received before (new call origination information Packet signal). When the time difference between the call reception time of the newly received packet signal and the call reception time of the packet signal received in the past is equal to or less than a predetermined value, it is determined as the new calling information. For example, this predetermined value is set to 5 milliseconds. In the case of FIG. The call reception time of the packet signal of 03 is “10: 10: 32: 002” and No. The call reception time of the packet signal of 04 is “10: 10: 32: 102”. Since these have an interval of 100 milliseconds, No. 03 call information and No. It is determined that the call origination information of 04 is not identical. At that time, the packet signal distribution unit 58 outputs No. The timer T is operated with the reception time of the packet signal of the packet signal 04 as a start point. That is, when it is determined that the packet signal is new call origination information, the packet signal distribution unit 58 operates the timer T with the reception time of the packet signal as the start point. The end time of the timer T is set by the line speed of the IP network 10 or the like, and is 50 milliseconds in this embodiment, for example.

  At the end of timer T, in the case of FIG. The packet signal from the second base station apparatus 14b of No. 05 and No. The packet signal from the third base station apparatus 14c of 06 is received. No. 05 and No. The call reception time of the packet signal of 06 is “10: 10: 32: 102” and “10: 10: 32: 103”, respectively, and the time difference from the reception time of the packet signal that operated the timer T is less than a predetermined value is there. Therefore, no. It is determined that the call content is the same as the call origination information of 04. The packet signal distribution unit 58 sends the determination unit 54 the No. 04, No. 05, No. It instructs to compare the quality information of the packet signal of 06. The determination unit 54 determines the No. 04, No. 05, No. The highest quality packet signal is identified from the quality information 06 and notified to the packet signal distribution unit 58.

  The packet signal distribution unit 58 generates a packet signal based on the packet signal notified from the determination unit 54 and the transmission time. FIG. 10 shows a data structure of a packet signal transmitted from the communication unit 50. As shown, transmission time, call reception time, calling information, quality information are included. Although not shown in FIG. 10, the packet signal transmitted from the communication unit 50 may include information on the transmission source base station apparatus (information indicating the base station apparatus 14 that has received the packet signal). Return to FIG. The transmission time is set by the line speed of the IP network 10 or the like. For example, a time 100 milliseconds after the earliest call reception time is set. In addition, the packet signal No. where the quality information is compared. 04, No. 05, No. 06 may be deleted from the packet signal buffer unit 52 after a certain period of time.

The determination of the quality in the determination unit 54 is performed, for example, as follows.
(A) The first method is a method using RSSI. In this case, the quality information indicates the RSSI value when the wireless reception unit 30 in the base station apparatus 14 receives the calling information. The determination unit 54 selects, among the quality information to be compared, the one with the largest RSSI value.
(B) The second method is a method using information on an error. In this case, the quality information is corrected by a numerical value indicating the number of errors (the number of errors, the error rate, etc.) generated in the wireless communication when the wireless reception unit 30 receives the calling information, or the error correction processing A number indicating the number of errors (number of errors, error rate, etc.) is shown. The determination unit 54 selects one of the quality information to be compared that has the smallest numerical value indicating the degree of error.

  (C) The third method is a method using call origination information. The determination unit 54 analyzes the calling information of each packet signal and detects noise components other than voice. For example, frequency components other than the band specific to speech, or components having temporal amplitude changes greater than or equal to a predetermined value may be used as noise components. Then, among the outgoing call information to be compared, the one with the smallest noise component is selected. Note that the determination unit 54 may calculate both the voice component and the noise component, calculate an SN ratio that is the ratio thereof, and select call information with the largest SN ratio. In addition, when using this 3rd method, the quality information of each packet signal is omissible.

Also, the quality may be determined by combining the first method to the third method. For example, assuming that the RSSI value is R, the numerical value indicating the degree of error is E, and the numerical value indicating the noise component is N, the overall score S is calculated by the calculation shown in equation (1). Here, α, β, and γ are weighting coefficients, and α> 0, β <0, and γ <0. Then, the packet signal with the largest overall score S is selected.
S = αR + βE + γN Formula (1)
The packet signal distribution unit 58 outputs the generated packet signal to the communication unit 50. The communication unit 50 transmits the packet signal from the first base station apparatus 14 a to the third base station apparatus 14 c via the IP network 10.

(3) Transmission process in the base station apparatus 14 When the communication unit 36 of the base station apparatus 14 shown in FIG. 5 receives a packet signal from the control apparatus 12 via the IP network 10, it obtains a second packet signal. Output to the section 38. The communication unit 36 that executes such reception processing can be said to be a reception unit. Also, the reception process is performed even when the transmission process is not performed.

  The second acquisition unit 38 acquires a packet signal from the communication unit 36. The second acquisition unit 38 stores the packet signal. Therefore, the second acquisition unit 38 can be said to be a received packet signal buffer unit. The second acquisition unit 38 receives the reference time from the detection unit 40, and does not store the packet signal when the transmission time in the packet signal has passed the reference time. FIG. 11 shows the data structure of data stored in the second acquisition unit 38. As shown in FIG. As shown, transmission time, call reception time, data area are included, and the data area includes call origination information and quality information. Such a second acquisition unit 38 is a call selected as the highest quality data by the control device 12 from among the plurality of call origination information received from the terminal device 16 by each of the plurality of base station devices 14. It can be said that information is acquired. Return to FIG.

  Here, FIG. 12 is used to explain the processing of the determination unit 34 and the control unit 42. FIG. 12 is a flowchart showing transmission processing by the base station apparatus 14. The control unit 42 acquires the reference time from the detection unit 40 (S100). The control unit 42 monitors the transmission time in the packet signal in the second acquisition unit 38, and determines whether there is a packet signal whose transmission time has passed the reference time (S110). If there is no packet signal whose transmission time has passed the reference time (N in S110), the process returns to S100. Note that the process may be stopped (sleeped) for a predetermined time before returning to S100. When there is a packet signal whose reference time has passed the transmission time (Y in S110), the process proceeds to S120.

  The control unit 42 acquires the call reception time in the packet signal (transmission scheduled packet signal) determined in S110 that the reference time has passed the transmission time (S120). Next, the control unit 42 targets the packet signal in the first acquisition unit 32, and the call reception time is included in the range of the call reception time acquired in S120 and the fixed period (for example, several milliseconds). It is determined whether there is a packet signal (S130). When there is no packet signal included in the fixed period (N in S130), the control unit 42 transmits calling information included in the packet signal in the second acquisition unit 38 (S200). Thereafter, the control unit 42 deletes the packet signal including the calling information transmitted from the second acquisition unit 38 (S300).

  When there is a packet signal included in the fixed period (Y in S130), the following processing is performed. The packet signal in the first acquisition unit 32 included in the fixed period is hereinafter referred to as “directly received packet signal”. The control unit 42 notifies the determination unit 34 of the transmission planned packet signal and the direct received packet signal. The calling information or quality information itself of the two packet signals may be notified, or the address of a buffer storing such information may be notified.

  The determination unit 34 evaluates the quality of the calling information included in the transmission planned packet signal (S140). The determination unit 34 evaluates the quality of the outgoing call information included in the direct received packet signal (S150). The determination unit 34 determines which of the outgoing call information of the transmission planned packet signal and the direct received packet signal is superior (S160). That is, the determination unit 34 compares the quality of the outgoing call information included in the direct received packet signal with the quality of the outgoing call information included in the transmission scheduled packet signal. Such comparison is performed when the difference between the time information included in the direct received packet signal and the time information included in the transmission scheduled packet signal satisfies a predetermined condition. Further, for comparison, at least one of the RSSI, the degree of error, and the noise included in the voice data is used as in the determination unit 54 of the control device 12.

  When it is determined that the quality of the directly received packet signal is high (Y in S160), the control unit 42 transmits calling information included in the packet signal in the first acquisition unit 32 (S210). When it is determined that the quality of the directly received packet signal is not high (N in S160), the control unit 42 transmits calling information included in the packet signal in the second acquisition unit 38 (S200). Thereafter, the control unit 42 deletes the packet signal including the calling information transmitted from the second acquisition unit 38 (S300).

  Although not shown in FIG. 12, the “source base station apparatus name” is included in the packet signal distributed from the control apparatus 12, and the “source base station apparatus name” receives the packet signal. If it matches the “base station device name” of the base station device (the base station device), the process (S130) for searching the inside of the first acquisition unit 32 is omitted, and the packet signal in the second acquisition unit 38 is transmitted. You may (S200). Return to FIG.

  The wireless transmission unit 44 stores the calling information included in the packet signal stored in the first acquisition unit 32 or the second acquisition unit 38 by executing transmission processing corresponding to the business wireless system. The call origination information included in the packet signal is transmitted to the terminal device 16. That is, the wireless transmission unit 44 determines the quality of the outgoing call information included in the packet signal stored in the first acquisition unit 32 or the outgoing call information included in the packet signal stored in the second acquisition unit 38. Send the higher one. In addition, when the terminal device 16 is provided with the monitoring function etc. of a wireless communication system, the wireless transmission part 44 may transmit the whole packet signal containing quality data.

  Here, the effects of such a configuration will be specifically described. It is assumed that FIG. 6 and FIG. 11 are data stored in the first acquisition unit 32 and the second acquisition unit 38 of the third base station apparatus 14 c, respectively. In the packet signal buffer unit 52 in the control device 12 of FIG. 9, as in FIG. At 07, the first base station apparatus 14a, no. At 08, the packet signal from the second base station apparatus 14b is received. On the other hand, the third base station apparatus 14c uses the same calling information as No. 6 in FIG. Although the data of 03 is received, the data of the packet signal from the third base station apparatus 14 c has not reached the control apparatus 12 at a normal time due to the delay of the IP network 10. In addition, the quality of the outgoing call information received from the terminal device 16 is “third base station device 14 c (high quality)> second base station device 14 b (medium quality)> first base station device 14 a (low quality)”. Suppose there is a case.

  In that case, since the packet signal of the third base station apparatus 14 c is not a target of the quality comparison process in the control apparatus 12, the packet signal of the second base station apparatus 14 b (medium quality) is distributed to each base station apparatus 14. . In the prior art, each base station apparatus 14 transmits medium-quality calling information received by the second base station apparatus 14b, but according to the present embodiment, the third base station apparatus 14c acquires its own first The high quality calling information held in the unit 32 is transmitted. As a result, even if a delay occurs in the IP network 10 and the packet signal can not be transmitted normally from the base station apparatus 14 to the control apparatus 12, each base station apparatus 14 can transmit higher quality call origination information within the possible range.

  When each base station apparatus 14 switches the outgoing call information to be transmitted by determining the quality of the outgoing call information, one base station apparatus 14 transmits the outgoing call information from the control apparatus 12 and another base station apparatus 14 may transmit its own outgoing call information. This corresponds to transmission of call origination information different from one another from a plurality of base station apparatuses 14. FIG. 13 shows the arrangement of the communication area 18 in the communication system 100. Each base station apparatus 14 forms a communication area 18 as a communicable area. Specifically, the first base station apparatus 14a forms a first communication area 18a, the second base station apparatus 14b forms a second communication area 18b, and the third base station apparatus 14c forms a third communication area 18c. Form Further, since the same channel is used in the first base station apparatus 14a to the third base station apparatus 14c, the same channel is used in the first communication area 18a to the third communication area 18c.

  Interference may occur if different call origination information is transmitted in the portion where the communication area 18 overlaps. Here, it is assumed that the first base station apparatus 14a and the second base station apparatus 14b transmit calling information from the control apparatus 12, and the third base station apparatus 14c transmits calling information of itself. In that case, interference occurs in a portion where the first communication area 18a and the third communication area 18c overlap, and a portion where the second communication area 18b and the third communication area 18c overlap.

  In order to cope with this, when calling information from the control device 12 is transmitted or when calling information held in the base station apparatus 14 is transmitted, the calling information is transmitted. The transmission power may be switched. FIG. 14 shows the data structure of the transmission power setting table stored in the control unit 42. In the transmission power setting table, the transmission power for each call origination information source (the control apparatus 12 or the base station apparatus 14) is set. When the calling information source is the control device 12, a value for forming a normal communication area 18 is set as the transmission power. On the other hand, when the calling information source is the base station apparatus 14, a value for setting the transmission power so as not to overlap the communication area 18 with the adjacent base station apparatus is set. For example, the transmission power is set to 50 W when transmitting the calling information from the control device 12, and the transmission power is set to 30 W when transmitting the calling information held by the base station apparatus 14. . That is, when transmitting the calling information held by the base station apparatus 14, the wireless transmission unit 44 makes the transmission power smaller than the case where the calling information from the control apparatus 12 is transmitted.

  FIG. 15 shows the arrangement of the communication area 18 in the case of FIG. This is shown as in FIG. The third communication area 18c is narrower than the first communication area 18a and the second communication area 18b. As a result, the third communication area 18c does not overlap the first communication area 18a and the second communication area 18b. As a result, interference between the first communication area 18a and the third communication area 18c and between the second communication area 18b and the third communication area 18c is less likely to occur.

  The transmission power setting table may be stored not in the base station apparatus 14 but in a base station information control apparatus (not shown) connected to the IP network 10. The base station device information control device centrally manages the overlapping state of the communication area 18 of each base station device 14 and the transmission power when each base station device 14 transmits calling information.

  FIG. 16 shows the data structure of another transmission power setting table stored in the base station information control apparatus. The base station device name indicates the name of each base station device 14, the calling information source indicates the calling information source type of the control device 12 or the base station device 14, and the transmission power indicates the control device 12 or the base station. The transmission power value of the device 14 is indicated. The transmission power setting table is updated, for example, when the operator of the communication system 100 installs the base station apparatus 14 or when the installation location of the installed base station apparatus 14 is changed. Each base station apparatus 14 acquires the transmission power value from the base station apparatus information control apparatus at an arbitrary timing, and switches the transmission power at the time of transmitting the calling information for each of the calling information. Also, the base station apparatus information control apparatus may be included in the control apparatus 12.

  The above-described control device 12 and the base station device 14 can be realized as hardware of a CPU, a memory, or another LSI of any computer, and software can be realized by a program loaded into the memory or the like. , Here are drawn functional blocks that are realized by their cooperation. Therefore, it is understood by those skilled in the art that these functional blocks can be realized in various forms only by hardware and by a combination of hardware and software.

  According to the present embodiment, since the calling information of the higher quality is transmitted based on the comparison result of the quality of the calling information from the terminal device and the quality of the calling information from the control device, control is performed. When the quality of the call origination information from the terminal device is higher than the quality of the call origination information from the device, the call origination information from the terminal device can be transmitted. In addition, even when the control device receives the highest quality call information from among the plurality of call origination information received from the terminal device by each of the plurality of base station devices, a terminal higher than the quality of the call information. It can transmit call origination information from the device. Further, since the calling information from the terminal apparatus is transmitted to the control apparatus, the calling information from the terminal apparatus can be compared with the calling information from another base station apparatus in the control apparatus.

  Also, since the higher quality calling information is transmitted based on the comparison result of the quality of the calling information from the terminal device and the quality of the calling information from the control device, in the route to the control device Even if an unexpected delay or failure occurs, the influence of the delay or failure on the communication quality can be reduced. Also, even if a packet signal can not be normally transmitted from the base station apparatus to the control apparatus due to the delay of the IP network, the base station apparatus holds a fixed number of packet signals, so that higher quality call information can be transmitted. . Further, even when a network delay occurs between the base station apparatus and the control apparatus, it is possible to transmit the highest quality calling information within the possible range.

  Also, when the difference between the time information for the call origination information from the terminal device and the time information for the call origination information from the control device satisfies a predetermined condition, these qualities are compared, so the contents of the same voice information Can compare the quality of the outgoing call information included. In addition, since at least one of the RSSI, the degree of error, and the noise is compared, the quality can be compared accurately. Further, since the transmission power at the time of transmitting the calling information from the terminal device is smaller than the transmission power at the time of transmitting the calling information from the control device, the influence of interference can be reduced.

  The present invention has been described above based on the embodiments. It is understood by those skilled in the art that this embodiment is an exemplification, and that various modifications can be made to the combination of each component and each processing process, and such a modification is also within the scope of the present invention. .

  According to the present embodiment, in the communication system 100, a business wireless system is used. However, not limited to this, for example, a wireless communication system such as a mobile phone other than the business wireless system may be used. According to this modification, the degree of freedom of the system can be improved.

  According to this embodiment, the control device 12 is configured separately from the base station device 14, and is connected to the base station device 14 via the IP network 10. However, the present invention is not limited to this. For example, the control device 12 may be integrally configured by being included in any of the base station devices 14. According to this modification, the degree of freedom of the configuration can be improved.

  According to the present embodiment, the transmission time is used as a parameter for instructing transmission timing of the calling information from the control device 12. However, not limited to this, for example, a counter value derived based on a PPS (Pulse Per second) signal obtained from the synchronization control reference device 20 may be used. According to this modification, the degree of freedom of the configuration can be improved.

  The IP network 10 is described as an example in the present embodiment. However, the present invention is not limited to this, and may be another network in which the transmission delay time of the network changes. According to this modification, the degree of freedom of the configuration can be improved.

  DESCRIPTION OF SYMBOLS 10 IP network 12 control apparatus 14 base station apparatus 16 terminal apparatus 18 communication area 20 reference | standard apparatus for synchronous control 30 radio | wireless receiving part 32 1st acquisition part 34 judgment part 36 communication part 38 2nd Acquisition unit, 40 detection units, 42 control units, 44 wireless transmission units, 50 communication units, 52 packet signal buffer units, 54 determination units, 56 detection units, 58 packet signal distribution units, 100 communication systems.

Claims (8)

A first acquisition unit that acquires first data from the terminal device;
A second acquisition unit that acquires second data from the control device;
A determination unit that compares the quality of the first data acquired by the first acquisition unit with the quality of the second data acquired by the second acquisition unit;
A transmitting unit for transmitting at least a part of the first data and the second data having the higher quality based on the comparison result of the determining unit;
A base station apparatus comprising:   The second acquisition unit acquires, as the second data, data selected as the highest quality data by the control device from among the plurality of data received from the terminal device by each of the plurality of base station devices. The base station apparatus according to claim 1, characterized in that   The base station apparatus according to claim 1, further comprising a second transmission unit that transmits the first data acquired by the first acquisition unit to the control device. The first acquisition unit acquires a plurality of first data, and each of the plurality of first data includes time information indicating time received from the terminal device,
The second data acquired by the second acquisition unit includes time information,
The determination unit compares the quality of the first data with the quality of the second data when the difference between the time information included in the first data and the time information included in the second data satisfies a predetermined condition. The base station apparatus according to any one of claims 1 to 3, characterized in that:   The determination unit includes a received signal strength at the time of receiving data from the terminal device, a degree of an error at the time of receiving data from the terminal device, noise included in audio data, each included in the first data and the second data. The base station apparatus according to any one of claims 1 to 4, wherein the quality of the first data and the quality of the second data are compared based on at least one of the information in the above.   The base according to any one of claims 1 to 5, wherein the transmission unit makes transmission power at the time of transmitting the first data smaller than transmission power at the time of transmitting the second data. Station equipment. Acquiring first data from a terminal device;
Obtaining second data from the controller;
Comparing the quality of the acquired first data with the quality of the acquired second data;
Transmitting at least a part of the first data and the second data of higher quality based on the comparison result;
A transmission method characterized by including. Acquiring first data from a terminal device;
Obtaining second data from the controller;
Comparing the quality of the acquired first data with the quality of the acquired second data;
A program for causing a computer to execute, based on a comparison result, transmitting at least a part of the first data and the second data having higher quality.

Images