JPH03229525A - Call supervisory system for radio telephone - Google Patents

Abstract

PURPOSE:To more accurately grasp the present condition when the quality of a call is deteriorated and to reduce the number of switching execution times for call channels so as to secure the quality of service by recording the process of the switching of the call channels in the supervisory of the transmission quality of a radio wave in the middle of a call and in the switching of the call channels. CONSTITUTION:A base station(BSn) 1 detects the deterioration of electric field S/N while a moving terminal station(TE) 6 calls to a subscriber telephone set(TEL) 5 through an antenna 21. BSn1 refers to call channel information and a call quality reference. When there is no results of CH switching, the station informs a radio exchange station(ES) 3 of deterioration. Then, it is speedily judged whether the switching of call CH is to be executed or not from the conditions of call quality deterioration. When it is 'NO', the measurement of a switching destination is instructed when there is room in a reception level. In TE 6, all control CH are scanned and a result is furthermore reported. When the quality of the call is more than the reference, the service of the call is given in the present call channel.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cellular radio telephone system, and particularly to monitoring radio wave propagation quality during a call and switching a call channel.

[Conventional technology]

Conventionally, in cellular radio telephone systems, call quality is managed only in the call system set at the time of a call. Then, when the call quality deteriorates in the set call system,
A base station repeater or a wireless telephone terminal transmits a wireless channel switching request or a call quality deterioration report to a common device.

[Problem that the invention seeks to solve]

Conventionally, in cellular radio telephone systems, when monitoring calls, either the current data (call quality) of the call system used for calls is monitored, or short-term fluctuations in the propagation of the radio system are monitored over a period of time measured by a timer. I'm monitoring it.

Therefore, in cellular radio telephone systems, wireless channel switching requests may occur due to sudden changes in the antenna position of the small mobile phone or the influence of the human body, especially when using a small mobile phone inside a building, such as when passing through urban buildings or in specific dead spots. It occurs frequently.

Furthermore, there is a problem in that a wireless channel switching request is generated to the system solid equipment due to multipath fading inside and outside the building, and the load for executing the switching request increases.

An object of the present invention is to provide a cellular radio telephone system that can reduce radio channel switching requests.

[Means for Solving the Problems] According to the present invention, a plurality of wireless telephone terminals, a plurality of relay devices connected to the wireless telephone terminals on mutually different radio channels, and a switching center connected to the relay devices. used in a cellular radio telephone system having a wireless telephone terminal, and the relay device includes a memory means for storing a communication channel number used for each radio telephone terminal, control channel information, reception level, and a time when the radio channel switching is performed as communication information. , a determining means for determining whether to implement a switching request from the wireless telephone terminal, and a transmitting means for transmitting the call information to the switching center when implementing the switching request, A radio telephone call monitoring system is obtained, characterized in that the station is equipped with transmission means for transmitting all call information regarding the switching requesting radio telephone terminal to the relay device to which the radio channel is switched.

〔Example〕

The present invention will be explained below with reference to Examples.

Referring to FIG. 1, the illustrated cellular telephone system is equipped with a base station (hereinafter referred to as BSn) 1 and BSx (base station) 2, and these BSn 1 and BSx 2 are referred to as wireless switching centers (hereinafter referred to as ES). Connected to 3.

The ES 3 is connected to a wired exchange (hereinafter referred to as EX) 4 in which general subscriber lines are accommodated, and exchange connection is made to a subscriber telephone set (hereinafter referred to as EX) 5 via the EX4. the current,
Assuming that BSn 1 is selected, BSn
A communication path between the mobile terminal station (hereinafter referred to as TE) 6 and the station 5 is completed via the mobile station 5.

BSn 1 and BSx 2 have antennas 21 and 22, respectively, and a telephone transmitter/receiver (hereinafter referred to as V-TRX) 31
and 33, control transceiver (hereinafter referred to as C-TRX) 3
2 and 34, telephone repeater (hereinafter referred to as V-REP) 4
1 and 43, control repeater (hereinafter referred to as C-REP) 4
2 and 44, and Prosensor (hereinafter referred to as RP) 51 and 5
2, and the EX3 is equipped with a central processing unit (CP
U) 61 and call path switching switch (hereinafter referred to as 5W) 7
1 is provided.

Here, the CPU 61 and each REP 41 to 43 are equipped with a memory, and when a call is made from the TE 6, the class of the TE 6 is identified by a code indicating the type of method sent in response to the call, and the class of each TE 6 is stored in the memory. The operation shown in FIG. 2 or the third time is performed with reference to this content.

Now, a case where the cellular radio telephone system is of a conventional type will be explained with reference to FIG. 2 as well.

While TE6 is talking via BSn 1, BSn 1
[Electric field/S] of the channel used for communication with TE6
/N Deterioration Detection” 101 and “Deterioration Report” 102
Send to S3. ES3 responds to the “deterioration report” by BS
TE6 electric field level, S/N, etc. to each base station including x.
"Measurement instruction" 103 is sent. Then, based on the "measurement/report J 104" from each base station in response to this "measurement instruction", the "switching destination base station" 105 and [switching destination CHJ 10
Make decision 6.

When these decisions are completed, for example, "switching instruction" 111
is sent to BSn 1, and the “switching destination CHPOW
ON" 112 to BSx2, and transmits "switching instruction" 121 to TE6 via the channel used by BSnl. This causes the TE6 to perform "switching" 122, while following the "switching" 112, the BSx
2, perform [switching destination CHPOWONJ 131]. "Wireless system switching? If J132 becomes YES (Y)" between TE6 and BSn 1 and BSx 2, in ES3, rsw switching and call continuation by switching the exchange switch.
141, send ``old CHPOW OFF, 142 to B5n1, [old CHPOW OFFJ 1
43, the operation of the old channel will be discontinued.

However, if step 132 is N (No), ES
3, sends "current CHf + childcare instruction" 151 to B5n1, causes it to perform "current CHPOW ON continuation J161", and repeats "electric field S/N deterioration detection" 101 and subsequent steps while "current CH electric field present J162 is Y" However, if "Current CH electric field exists" 162 becomes N, it is unavoidable that [Call disconnection J1
71 is performed in ES3.

Next, an embodiment of the cellular telephone system according to the present invention will be described with reference to FIGS. 1 and 3.

Information regarding a call channel in a past call (call channel information) is stored in the call repeater as shown in FIG. Furthermore, a speech quality standard shown in FIG. 5 is set for the base stations 1 and 2, and is used as a standard for determining the reception level at the V-TRXs 31 and 33, as will be described later.

TBG is antenna 21.1-TRX 31, V-REP
During the conversation with BSn 1 through 41, BSn 1 said,
S/N deterioration detection" 101 is performed, and when the electric field level of the TBG or the S/N ratio becomes "below the lower caution level" shown in FIG. 5, step 201 is executed. BSn
1 refers to the call channel information and call quality standards, and
If there is no record of H switching, that is, if the communication channel information is not stored in the memory, a deterioration report is sent to the ES3, and the operation described below with reference to FIG. 2 is performed. Step 201C
If there is a H switching record, it is determined whether it is the second time 202, and if it is not the second time, it is determined whether it is below the switching execution level j203.On the other hand, if it is the second time, [Is this the previous neighboring cell?] 204 is determined. If "NO", a determination is made as to "Is it less than the switching execution level?" 205.

That is, in steps 202 to 205, it is determined whether or not to quickly switch the communication channel based on the state of deterioration of the communication quality.

If "NO" in step 203 or step 205, that is, if there is a margin in the reception level, "switch destination measurement instruction" 206 is executed. Then, execute "scan all control channels" 207 in TBG, and then "report results" 20
Execute step 8.

At BSn 1, the ``result check'' 209 is executed and it is determined whether to further request rCH switching'' 21O.

In the determination in step 210, for example, the determination shown in FIG. 6 is made, and if the call quality is
If it is equal to or greater than the 0 standard, the current call channel is used to service the call and the process flow returns to step 101 or earlier.

On the other hand, if step 210 is Y, each control CH level measured at the TBG has been transferred from BSn 1 to ES3, so that ES3 can select a switching destination cell using transfer information. In other words, steps 103 to 106 shown in FIG. 2 are not executed, and instead, in step 211, "base station determination" is performed, and in step 212, it is determined whether "there is an empty CH".

In addition, CPIJ61 of ES6 is the control in T E 6
If it is determined that the acH measurement information is insufficient, steps 103 to 106 in FIG. 2 can be executed again.

Also, between TBG and BSn 1, step 2 in FIG.
In a system that also services TBG types that cannot execute flows 06 to 209, the ES3 CPU 61
Then, the judgment shown in FIG. 6 can be made. As a result, it is possible to limit actual switching in response to switching requests that occur more than necessary.

〔Effect of the invention〕

As described above, according to the present invention, by recording the progress of call channel switching, it is possible to more accurately grasp the current situation when call quality deteriorates, reduce the number of times call channel switching is performed as much as possible, and ensure service quality. It has the effect of being able to. As a result, the system capacity can be substantially increased by suppressing an increase in the processing amount of the central processing unit (CPU) as the number of users of small mobile phones in the cellular radio telephone exchange increases.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a cellular telephone system to which the present invention is applied, FIGS. 2 and 3 are flowcharts for explaining the selection status of base stations and channels to be used, and FIG. FIG. 5 is a diagram showing a table used to record the progress of CH switching during a call. FIG. 5 is a diagram showing a table used to judge the quality of reception at a wireless base station. FIG. It is a figure which shows the table of the end. 1.2...Base station, 3...Radio switching center, 6...Mobile terminal station, 31.33...Telephone transceiver, 32.3
4... Control transceiver, 41.43... Call repeater, 42.44... Control repeater, 51.52...
Pukocenosa, 61...Central processing unit. 150-

Claims (1)

[Claims] 1. Used in a cellular radio telephone system having a plurality of radio telephone terminals, a plurality of relay devices on mutually different radio channels from the radio telephone terminals, and a switching center connected to the relay devices, the relay device a memory means for storing the used call channel number, control channel information, reception level, and radio channel switching implementation time for each radio telephone terminal as call information; and whether or not to implement a switching request from the radio telephone terminal. a judgment means for making a judgment;
When carrying out the switching request, a transmission means is provided for transmitting the call information to the switching center, and the switching center transmits all information regarding the switching request wireless telephone terminal to the relay device to which the wireless channel is switched. 1. A call monitoring system for a wireless telephone, characterized in that a transmission means for transmitting call information is provided.