JPH02237229A - Data delay system in mobile communication - Google Patents

Abstract

PURPOSE:To shorten the interruption time of communication at the time of channel switching by permitting a base station to once accumulate communication data from mobile equipment, to delay data for a prescribed time and transmitting it to an exchange. CONSTITUTION:When the mobile equipment 1 moves from the radio zone of a base station 2-1 to the radio zone of a base station 2-2, a receiver 6-2 accumulates communication data from the mobile equipment 1 into a data delay device 10-2 for the prescribed time and transmits it to the exchange 3. As for the delay quantity of the data delay devices 10-1 and 10-2, a time almost equal to a time until the communication bus of a channel equipment 4 in the exchange 3 is altered from when the receivers 6-1 and 6-2 receive communication data from the mobile equipment 1 at the time of channel switching is set. Thus, the time when communication data after channel switching arrives the exchange 3 can be adjusted almost the same as the time when the exchange 3 changes the channel, and the interruption time of communication at the time of channel switching can be shortened.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for transmitting a channel switching control signal from a base station to an exchange when switching channels as a mobile device moves from one radio zone to another in a mobile communication system. The present invention relates to a data delay method in which communication data is delayed at a base station in order to reduce transmission time and communication interruption time corresponding to the processing time.

[Problems to be solved by Jubei's technology and inventions] Figure 3 shows the configuration of Yobei's mobile communication system.

1 is a mobile device, 2-1.2-2 is a base station, 3 is a switch, 4
5 is a communication path device, 5 is a switch control device, 6-1.6-2 is a receiver, 7-1.7-2 is a base station control device, 8-1
．． 8-2 is a data line, and 9 is a control line.

In FIG. 3, communication data from the mobile station 1 is sent to the base station 2-1.
received by the receiver 6-1 in the data cycle 1i8
-1 to exchange 3.

In FIG. 3, movement 1'l! A channel switching control method when mobile station 1 moves from the wireless zone of base station 2-1 to the wireless zone of base station 2-2 will be described below.

First, the presence or absence of communication data from the mobile device 1 is monitored by the receiver 6-2 at the destination base station 2-2. When the receiver 6-2 detects communication data from the mobile device 1, it sends the communication data to the exchange 3 through the data line 8-2 and notifies the base station controller 7-2 that channel switching has been executed. do. The base station control device 7-2 is
The exchange controller 5 of the exchange shrimp 3 is notified through the control line 9 that the channel switching has been completed. The exchange control device 5 changes the communication path of the communication path device 4 in order to switch the data line for receiving the communication data from the mobile 8!1 from the data line 8-1 to the data line #i8-2.

In this way, in the U.S. mobile communication system, when switching channels, only the time required from detecting communication data from the mobile device at the destination base station to switching the communication bus of the communication path device of the exchange The drawback was that communication was interrupted.

The purpose of the present invention is to provide a data delay method that solves the drawback that in the conventional method, communication is interrupted for the period from when the base station detects that the mobile device has completed channel switching until the exchange changes the communication path. Our goal is to provide the following.

[Means to solve the problem]

According to the invention, the above objects are achieved by the means specified in the claims.

That is, the present invention divides a communication service area into a plurality of wireless zones, deploys a base station in each wireless zone, connects a mobile device and the base station with a wireless line, and connects the base station and the exchange to a mobile station. A data line that carries communication data from the aircraft and a control data line that carries control data from the base station.
! Connected through one line, the base station detects that the mobile device has completed switching the wireless line, the base station notifies the exchange through the control line, and the exchange changes the internal communication path in response to the channel switch. In mobile communication systems that
The base station is equipped with means for time-delaying communication data, and the delay time is set as the time required from when the base station detects a channel change until the exchange changes the internal communication path, and This is a data delay method in mobile communication in which communication data transmitted through a wireless line is delayed by a set time and then relayed to an exchange via the data line.

[For production]

According to the present invention, communication data from a mobile device is delayed at the base station by a time corresponding to the time from when the base station detects that the mobile device has completed channel switching until the switching equipment changes the communication path.

This technology differs from the technology of the United States in that communication data from mobile devices is stored at the base station, delayed for a certain period of time, and then transmitted to the exchange.

〔Example〕

FIG. 1 shows an example of a mobile communication system configuration for implementing the data delay method of the present invention.

In FIG. 1, 10-1 and 10-2 are data delay devices, and the other 1 to 9 are the same as those in FIG.

In the younger brother 1 diagram, communication data from mobile device 1 is sent to base station 2.
-1 is received by the receiving station 6-1, and after being stored for a certain period of time in the data delay device 7110-1, it is sent to the exchange through the data line 8-1.

In FIG. 1, the channel switching control method when mobile device 1 moves from the wireless zone of base station 2-1 to the wireless zone of base station 2-2 is RX! This system is exactly the same as the US system except that 6-2 stores the communication data from the mobile station 1 in the data delay device 10-2 for a certain period of time and then transmits it to the exchange through the data line 8-2.

Figure 2 shows the configuration of the data delay device 10-1 and 10-2.

In the figure, 11 is a data buffer, 12 is a write counter, 13 is a read counter, 14 is a humpator,
15 is an AND circuit.

The communication data of the mobile device 1 received by the receiver 6-1, 6-2 is sequentially written by the write counter 12 from the first address of the data buffer 7711, and written by the read counter 13 sequentially from the first address of the data buffer 7711. Read out.

The counter values of the write counter 12 and read counter 13 are counted up by the external clock CK.

In order to delay data, it is necessary to control the data buffer 11 so that the data is stored in the data buffer 11 for a certain period of time and then read out.

This function is realized by a converter 14 and an AND circuit 15. The comparator 14 sets a reference value to the input A, and when the input B exceeds this reference value, the output C is set to a logical value "
1” is output.

Further, the clock CK and the output of the comparator 14 are ANDed by the AND circuit 15 and then input to the read counter 13 .

Now, let the clock interval be T, and the time you want to delay is nT.
Then, the base station control device 7-17-2 sets n as the reference value of the comparator 14. By doing this, the clock C K 7! Only after inputting Ifn clocks, the comparator 14 outputs "1".

Therefore, the clock CK input to the read counter 13
is input by the AND circuit 15 with a delay of n clocks, so the counter value of the read counter 13 is always smaller than the counter value of the write counter 12 by n. By doing this, the communication data from the mobile device is stored in the data buffer 11 by nT before being read out.

-81 Data delay device 10-1. As the delay amount nT of 10-2, when the receiving device 6-1.6-2 receives the communication data from the mobile device at the time of channel switching, the switching device 3's communication path device The data delay devices of all base stations are set to a time approximately equal to the time Tc until the communication path of No. 4 is changed. By doing this, the communication data from the mobile island 1 is delayed by nT at the base station and sent to the exchange 8!3, so the mobile island 1 is transferred from the wireless zone of the base station 2-1 to the wireless zone of the base station 2-2. When moving to a zone, communication data corresponding to the delay time nT of the channel switching control time Tc is transmitted from the base station 2-1, and then from the base station 2-2.

At channel switching control time open Tc, the path is still set for the communication path device 4 of the exchange 3 to receive communication data from the base station 2-1, so during this delay time nT, communication is not interrupted and communication is continued. The only thing that is disrupted is the time difference between the delay time nT and the time Tc opened during channel switching control.

In this manner, the present invention can reduce the communication interruption time to the time ITc - nTl, whereas in the prior art the communication was interrupted for the channel switching time Tc.

〔Effect of the invention〕

As explained above, in the present invention, communication data from a mobile device is transmitted for a period of time corresponding to the time from when the base station detects that the mobile device has completed channel switching until the switching equipment changes the communication path. To delay at the base station,
The time at which communication data arrives at the exchange after channel switching is almost the same as the time at which the exchange changes the communication route, and has the advantage of reducing communication interruption time when switching channels compared to conventional American technology. .

Since the channel switching control time can almost be estimated in advance depending on the system configuration, channel switching method, etc., the data delay time can be initialized at the time of system startup.

In addition, when a communication data signal processing device such as an audio codec is installed in a base station, the signal processing device itself causes a delay of several tens of milliseconds, which is about the same as the delay channel switching control time, so the signal processing device is used as a data delay device. Because of this function, there is no need to install a data delay device in particular, and in reality, the base station can be configured only with devices that do not require this.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the configuration of a mobile communication system having the data delay function of the present invention, Fig. 2 is a diagram showing the configuration of a data delay device that realizes the data delay function of the present invention, and Fig. 3 is a diagram showing the configuration of a mobile communication system having the data delay function of the present invention. FIG. 1 is a diagram showing a system configuration. 1...Mobile device, 2-1. 2
-2. ．． ．． ．．・・・Base station, 3 ・・・・・・
Switchboard, 4...Call path equipment, 5...
...exchange control device, 6-1 6-2
...Reception Tsuki? -1 7-2...
...Base station control device, ...Data line,
9...10-1 10-2...11...Data write counter, 14...AND circuit...Control line,...Data delay device, X 7a, 12 ゜゜8゜゛013...
... Read counter, ... Comparator,
15

Claims (1)

[Claims] A communication service area is divided into a plurality of wireless zones, a base station is installed in each wireless zone, a mobile device and the base station are connected via a wireless line, and the base station and the exchange are connected from the mobile device. The base station detects that the mobile device has completed switching the wireless line, and the base station notifies the exchange through the control line. However, in a mobile communication system in which the exchange changes the internal communication path in response to channel switching, the base station is equipped with a means for time delaying communication data, and the delay time is determined by the time after the base station detects the channel switching. Setting the time required for the exchange to change the internal communication path, delaying the communication data transmitted from the mobile device through the wireless line by the set time, and then relaying it to the exchange through the data line. A data delay method in mobile communications characterized by: