JPH02164141A - Frame synchronization setting method - Google Patents

Abstract

PURPOSE:To set a communication channel attended with an outgoing call, an incoming call and the switching of a communication channel without any delay by constituting a super frame independent timewise at every communication channel. CONSTITUTION:When deterioration in the quality of a communication channel is detected and a radio line control connecting to a radio base station A1 decides the communication channel of switching destination, the radio base station A1 sends a channel switching command or the like to a mobile equipment 2. The mobile station 2 sends or receives a signal required for channel switching, switches the channel to a designated communication channel in the timing of an idle frame of the next super frame restarts the transmission while keeping the synchronizing timing of the frame the mobile equipment 2 itself when a preamble signal 9 from the radio base station B3 is received. When the radio base station B3 receives a super frame synchronizing signal sent from the mobile equipment, the super frame synchronization is established and the communication is restarted.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for setting frame synchronization in digital mobile communication having a superframe configuration, and particularly relates to a method for setting frame synchronization in digital mobile communication having a superframe configuration, and in particular, a method for setting frame synchronization between base stations and superframe synchronization. (This invention relates to a frame synchronization setting method that allows communication channel settings to be performed without delay in connection with outgoing calls, incoming calls, and channel switching during communication.

[Conventional technology]

Regarding the setting method of frame synchronization and superframe synchronization during call origination, call reception, and channel switching during communication, there are two methods for setting superframe synchronization between base stations: A method is proposed to complete the configuration of synchronization and superframe synchronization.

FIG. 5 is a time chart showing a communication channel switching procedure using such a conventional frame synchronization setting method for synchronizing superframes between base stations.

Normally, it is difficult to establish inter-base station frame synchronization at the bit level, so there is a difference of one bit or more between the frame synchronization timing of base station A and the frame synchronization timing of base station B.

In FIG. 5, radio base station A transmits a channel switching command, etc. to the mobile device. After the mobile device finishes transmitting and receiving the signals necessary for channel switching, it switches to the communication channel of the specified frequency f8 at the timing of an empty frame in the next superframe, and when it receives the superframe synchronization signal from wireless base station B, the mobile device switches to the communication channel of the specified frequency f8. Transmission is restarted by adjusting the synchronization timing to the timing of the received signal.

Upon receiving the channel switching command, radio base station B starts transmission on the communication channel of the designated frequency fa. The timing of the superframe is specified by a device that performs superframe synchronization between base stations.

Since the mobile device has different frame synchronization timings before and after channel switching, discontinuity occurs in the transmitted communication signals.

Furthermore, the base station side requires a device that has a function of synchronizing superframes between base stations.

FIG. 6 is a time chart showing a communication channel setting procedure when a call is originated or received by a frame synchronization setting method that performs superframe synchronization between base stations.

In FIG. 6, the base station starts transmitting signals through the communication channel before completing the transmission and reception of signals necessary for setting up the communication channel through the control channel. The timing of the superframe is specified by a device that performs superframe synchronization between base stations.

As in the previous example, the mobile device switches to the specified communication channel as soon as it finishes transmitting and receiving the signals necessary for setting up the communication channel on the control channel, and starts superframe synchronization when it receives the superframe synchronization signal transmitted from the base station. and start communication. Since the timing of the superframe is determined by the amount of fi relative to the timing at which the mobile device switches to the communication channel, there is an average delay of Ts/2 (Ts is the length of the superframe) before communication starts.

It is possible to simplify the configuration of frame synchronization circuits of base stations and mobile devices, and also allows communication channel settings to be performed without delay during call origination, call reception, and communication channel switching. The purpose of this paper is to provide a frame synchronization setting method that can be used.

[Problem to be solved by the invention]

As mentioned above, the conventional method of synchronizing superframes between base stations requires the base station to have a function for establishing superframe synchronization between base stations. Because it is difficult to establish
There were problems such as the need to provide the mobile device with a function to absorb synchronization deviations.

Also, when making or receiving a call, J(Fr
There was a problem in that after the end of the communication, communication could not be started until the timing of an empty time slot in the superframe, resulting in a delay.

The present invention is a means for solving CB and M in order to solve the above problems] According to the present invention, the above object is achieved by the means described in the claims.

In other words, the invention of claim 1 frames information and then collects a plurality of frames to form a super frame,
In digital mobile communication, where a superframe synchronization signal is added for transmission over the radio section, frame synchronization is set in the dark between the mobile device and the wireless base station when setting a new communication channel due to channel switching during communication. In the method, the mobile device maintains the timing of frame synchronization and superframe synchronization before channel switching even after channel switching, and a new radio base station after channel switching receives a superframe synchronization signal from the mobile device. establishes frame synchronization and superframe synchronization using The invention according to claim 2 provides a frame synchronization setting method for performing frame synchronization between a mobile device and a radio base station when setting a communication channel accompanying a call origination or an incoming call in the digital mobile communication. The wireless base station starts transmitting a superframe synchronization signal on a communication channel immediately after or before the end of communication on a control channel, and the mobile device receives the signal from the wireless base station. , establishes frame synchronization and superframe synchronization by receiving the received signal, and constructs and transmits the superframe of the transmitted signal in synchronization with the superframe of the received signal, thereby achieving time-independent frame synchronization and superframe for each channel. This is a frame synchronization setting method to establish synchronization.

Further, in the digital mobile communication, the radio base station transmits a superframe synchronization signal or the like as a preamble signal on the communication channel immediately after or prior to the end of communication on the control channel. When the mobile device receives a signal from the wireless base station,
The wireless base station starts transmitting a superframe synchronization signal at the timing of the mobile device's own frame synchronization, receives the superframe synchronization signal from the mobile device, establishes frame synchronization, and establishes uplink superframe synchronization, and performs reception. This is a frame synchronization setting method that establishes temporally independent frame synchronization and superframe comradeship for each channel by constructing and transmitting a superframe of a transmission signal in synchronization with a superframe of a signal.

〔Example〕

FIG. 1 is a diagram for explaining the communication channel switching procedure according to the frame synchronization setting method of the present invention, and shows that while the radio base station A indicated by the numeral 1 and the mobile fi2 are communicating on the communication channel of the frequency fm, An example is shown in which the quality of the communication channel deteriorates and the communication channel is switched to a communication channel of frequency f8 of radio base station B indicated by number 3. Further, in the same figure, ① to ② represent procedures, and FIG. 2 shows the time chart thereof.

In FIG. 2, the number 4 is a frame, 5 is a super frame, 6 is a communication control signal, 7 is an empty frame,
8 represents an information signal, and 9 represents a preamble signal.

In Figs. 1 and 2, when radio base station A1 or mobile device 2 detects deterioration in the quality of the communication channel (frequency f^) that is being communicated with, the radio network control station connected to radio base station A1 is contacted. When the wireless base station A1 determines the switching destination communication channel, the wireless base station A1 transmits a channel switching command etc. to the mobile 8!2 using the communication control signal 6 of the communication channel.

After the mobile device 2 transmits and receives the signal necessary for channel switching N1, at the timing of an empty frame of the next superframe,
When switching to the communication channel of the designated frequency fs and receiving the preamble signal 9 from the radio base station B3, the mobile device 2 resumes transmission while maintaining its own frame synchronization timing.

At this time, when the radio base station B3 receives a channel switching command etc. from the radio network control station etc., it starts continuous transmission of preamble signals, and when it receives a superframe synchronization signal transmitted from the mobile device, it starts superframe synchronization. established,
Resume communication.

Since the mobile device maintains the frame synchronization timing before channel switching even after channel switching, it is possible to continuously transmit communication signals.

FIG. 3 is a diagram for explaining the communication channel setting procedure when making or receiving a call using the frame synchronization setting method of the present invention, in which 1 and 2 are the same as in Figure #1, and 10 indicates the communication channel; 11 represents the filj control channel, and ■
~■ indicates the procedure.

Further, FIG. 4 is a time chart thereof, in which 12 represents information such as communication channel designation, and 13 represents information such as communication channel designation confirmation.

As shown in FIGS. 3 and 4, the base station uses a control channel to transmit and receive signals necessary for setting a communication channel, such as specifying a communication channel.

The base station starts successive transmission of superframe synchronization signals in advance on the communication channel before completing transmission and reception of the signal on the control channel.

Immediately after the mobile device finishes transmitting and receiving the signals necessary for setting up the communication channel on the control channel, it switches to the specified communication channel, and upon receiving the superframe synchronization signal transmitted from the base station, establishes superframe synchronization, Start communication. Since the superframe is set independently for each channel, communication on the communication channel can be started immediately after the transmission and reception of signals on the control channel is completed.

When the mobile device receives a signal from the wireless base station, it starts transmitting a superframe synchronization signal at its own timing, and when the wireless base station receives the superframe synchronization signal from the mobile device, the frame There are also ways to establish synchronization and superframe synchronization and start communication.

In this case, the procedure for setting frame synchronization is the same as the procedure for switching channels during communication.

〔Effect of the invention〕

As explained above, the frame synchronization setting method of the present invention can be used in digital mobile communications with a superframe configuration.
By configuring temporally independent superframes for each communication channel, it is possible to set communication channels without delay when switching channels during outgoing and incoming calls. According to the above method, there is no need to perform frame synchronization between base stations and one superframe compatibility, and there is an advantage that the structure of the frame synchronization circuit of the base station and the mobile device can be simplified.

le signal, communication channels, １１　・・・・・・ control channel,

[Brief explanation of the drawing]

FIG. 1 is a diagram explaining a communication channel switching procedure using the frame synchronization setting method of the present invention, FIG. 2 is a time chart, and FIG. 3 is a communication channel when a call is made or received using the frame synchronization setting method of the present invention. Figure 4 is a time chart explaining the setting procedure, Figure 5 is a time chart of the communication channel switching procedure using the conventional frame synchronization setting method that synchronizes superframes between base stations, and Figure 6 is a time chart of the communication channel switching procedure between base stations. 3 is a time chart of a communication channel setting procedure when a call is originated or received by a frame synchronization setting method that achieves superframe synchronization. 1 ...Base station A 2 ...Mobile device, 3 ...M station Mt B 14 ...
...Frame, 5 ...Super frame,
6...Communication control signal,
7...Empty frame, 8...Information signal, 9...Preamplifier...
information

Claims (1)

[Claims] 1. In digital mobile communications in which information is framed, a plurality of frames are put together to form a superframe, and a superframe synchronization signal is added for transmission over a radio section, channel switching during communication. This is a method for setting frame synchronization between a mobile device and a radio base station when setting up a new communication channel associated with channel switching, and the mobile device maintains frame synchronization and superframe synchronization before channel switching even after channel switching. maintain timing,
The new radio base station after channel switching receives the superframe synchronization signal from the mobile device, establishes frame synchronization and superframe synchronization, and configures a superframe of the transmission signal in synchronization with the superframe of the reception signal. A frame synchronization setting method characterized by establishing time-independent frame synchronization and superframe synchronization for each channel by transmitting. 2. In digital mobile communication, in which information is framed, multiple frames are put together to form a superframe, and a superframe synchronization signal is added to transmit the information over the radio section.Communications associated with outgoing or incoming calls. This is a method of setting frame synchronization between a mobile device and a radio base station when setting a channel, and the radio base station starts transmitting a superframe synchronization signal on a communication channel near the end of communication on a control channel. , the mobile device receives the signal from the wireless base station, establishes frame synchronization and superframe synchronization, and synchronizes with the superframe of the received signal to configure and transmit the superframe of the transmitted signal, thereby transmitting the superframe of the transmitted signal. A frame synchronization setting method characterized by establishing temporally independent frame synchronization and superframe synchronization. 3. In digital mobile communications, where information is framed, multiple frames are put together to form a superframe, and a superframe synchronization signal is added to transmit the information over the radio section. This is a method of setting frame synchronization between a mobile device and a wireless base station when setting up a communication channel, and the wireless base station sends a superframe as a preamble signal on the communication channel near the end of communication on the control channel. When the mobile device starts transmitting a synchronization signal, etc. and receives a signal from the wireless base station, it starts transmitting a superframe synchronization signal at the timing of frame synchronization of the mobile device itself, and the wireless base station By receiving a superframe synchronization signal from a channel, establishing frame synchronization and superframe synchronization, and composing and transmitting a superframe of a transmission signal in synchronization with the superframe of a reception signal, A frame synchronization setting method characterized by establishing independent frame synchronization and superframe synchronization.