JPH0846561A - Frame synchronization method - Google Patents

Abstract

PURPOSE:To prevent reduction in throughput by sending a specific signal for frame synchronization to an error controller from a mobile station with a synchronization circuit via a base station prior to start of communication so as to set up the synchronization of the signal from the mobile station to the error controller thereby avoiding a large sized base station and reduction in the economy. CONSTITUTION:A synchronization signal (ARQFS) burst) is sent from a mobile station 4 (4-1-4-n) to a connection device 2 via a base station 3(3-1-3-n). The connection device 2 receiving the signal establishes the synchronization of a signal (incoming signal) from the mobile equipment to a network 1. Then the device 2 sends the synchronization signal to the mobile station 4 via the base station 3 to establish the synchronization of the signal (outgoing signal) in the direction of the mobile station 4. The mobile station 4 compares the phase of the signal from the device 2 with a correct phase to detect a phase difference. The phase difference is sent to the device 2 by using the ARQFS burst. The device 2 corrects the phase of the frame of the outgoing signal based on the phase difference to establish the synchronization of the frame of the outgoing signal. The outgoing ARQS burst is sent again to the station 4 and when the synchronization is confirmed by the station 4, the usual communication is transited.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time division multiplex communication method, and by obtaining a frame delimiter, which is a group of signals for performing error control for performing error correction control, at a remote place, The present invention relates to an aggregate frame synchronization method capable of performing error control without deteriorating transmission characteristics.

[0002]

2. Description of the Related Art FIG. 6 is a diagram showing an example of a conventional mobile communication system, in which numeral 51 is a network, 52 is a connecting device, 53-1 to 53-n are base stations, and 54-1 to 54.
-N is a mobile station, 55 is a mobile station that does not require error control,
Reference numeral 56 represents an error controller.

Conventionally, in the system as shown in this figure, in order to reduce errors occurring in the radio section, each mobile station 54-1 to
54-n and each of the base stations 53-1 to 53-n are equipped with an error controller 56. In this case, the error controller 56 must be installed in each base station regardless of the amount of communication requiring error control.

However, since this has nothing to do with the actual operation of the error controller in the base station, there was a problem in terms of economical efficiency in base station equipment. In order to solve this, even if an error controller 56 is attempted to be integrated in the connection device 52, in such a system, the frame of the unit for performing the error control is the transmission delay time of the transmission line between the base station and the connection device. I couldn't summarize because I don't know.

FIG. 7 is a diagram showing another example of a conventional mobile communication system, in which numeral 51 is a network and 54-
1 to 54-n are mobile stations, 55 is a mobile station that does not require error control, 56 is an error controller, 57-1 to 57-n are base stations, 58 is a connection device, 59 is a synchronization circuit, and 60 is It represents a combiner for combining an information signal and a synchronization signal.

In this example, the error control function is integrated in the connection device, but equipment for transmitting a signal for synchronization between the base station and the connection device in order to establish synchronization of the phase of the frame is provided. I need.

When the base station receives a time-divided signal, this synchronization equalizes the burst-received signal between the time when it is not received and the time when it is received and is constant. It is necessary because efficient transmission is performed by transmitting at the speed.

That is, the frame information of the signal received in burst in this leveling is lost at the base station, and the frame of the signal for error control cannot be transmitted to the connection device. The frame of the time division signal transmitted in the wireless section and the frame of the signal sequence for error correction are usually the same, but different frames may be used.

[0009]

Among the conventional methods as described above, the former method in which an error controller is provided in each base station leads to an increase in size of the base station and is poor in economical efficiency. Further, there is a problem that there is a difficulty in maintenance.

On the other hand, in the latter method of consolidating the error control function in the connection device, in order to synchronize the signals, the frame information must always be transmitted between the base station and the connection device. However, there was a problem that the throughput decreased.

The present invention has been made in view of such problems of the prior art.
It is an object of the present invention to provide a transmission method that can be realized without increasing the size of a base station and without impairing economic efficiency, has good maintainability, and does not reduce communication throughput.

[0012]

According to the invention, the aforesaid problems are solved by the means defined in the claims. That is, the invention of claim 1 is a wireless communication system for performing two-way communication between a mobile station and a base station by time division multiplexing (TDMA),

The base station is connected to the network via a connection device, and the mobile station has a retransmission control circuit or an error correction circuit as an error controller for coping with an error occurring in the radio transmission line. An error controller that performs error correction control facing the controller is provided in the connection device,

For synchronization, the mobile station notifies the connection device having the error controller via the base station of the frame phase indicating the phase relationship between the bit sequence (information) to be transmitted and the time division multiplexed signal in the radio section. While transmitting a signal, the connection device that has received the synchronization signal recognizes the frame phase of the wireless section based on the signal and inputs it to the error controller in frame units to enable error control,

In order to establish the synchronization of the frame phase of the signal directed to the mobile station, the synchronization signal is transmitted from the connection device via the base station, and the mobile station receiving the synchronization signal transmits the frame of the wireless section. Detects the phase difference between the phase and the signal from the connection device, and notifies the connection device of the phase difference via the base station,
This is a frame synchronization method for controlling the frame phase of a signal transmitted from a connection device to a mobile station based on the notified phase difference.

The invention of claim 2 is the time division multiplexing system (TD).
In a wireless communication system in which a mobile station and a base station perform bi-directional communication according to (MA), the base station is connected to a network via a connection device, and the mobile station has an error for coping with an error that occurs in a wireless transmission path. Has a retransmission control circuit or error correction circuit as a controller,

An error controller, which is opposed to the error controller of the mobile station and performs error correction control, is provided in the connection device, and is transmitted from the connection device to the mobile station having the error controller via the base station. A synchronization signal for notifying a frame phase indicating a phase relationship between a bit string (information) and a time division multiplexed signal in a wireless section is transmitted,

The mobile station that has received the synchronization signal detects the phase difference between the phase of the frame in the wireless section and the signal from the connection device, and notifies the connection device of the phase difference via the base station. This is a frame synchronization method for controlling the frame phase of a signal transmitted from a connection device to a mobile station based on the phase difference.

[0019]

FIG. 1 is a diagram showing the basic configuration of the present invention, in which numeral 1 is a network, 2 is a connection device, and 3-1
~ 3-n are base stations, 4-1 to 4-n are mobile stations, 5 are mobile stations that do not require error control, 6 and 7 are error controllers, 8,
Reference numeral 9 represents a synchronizing circuit.

In the present invention, as shown in the figure, the error controller 6 is installed in the connection device 2 and the signals from many base stations are aggregated so that the error control is performed on the signals requiring error control. Allow control. Prior to the start of communication, the synchronization circuit 8 is used to transmit a predetermined specific signal for establishing frame synchronization from the mobile station to the error controller 6 via the base station. The error controller 6 establishes signal synchronization from the mobile station to the error controller 6 with the synchronization signal.

In order to establish synchronization from the connection device 2 to the mobile station, a signal for frame synchronization is transmitted from the connection device 2 via the base station, and the mobile station transmits the position of the signal and the correct frame. The phase difference is detected and the phase difference is transmitted from the mobile station to the connection device 2. The connection device 2 changes the phase of the signal to be transmitted by an amount corresponding to the phase difference notified from the mobile station, thereby establishing synchronization of the signal from the connection device 2 to the mobile station.

As described above, by performing communication for a short time between the connection device and the mobile station prior to communication, frame synchronization in units of error control can be established, and the base station and the connection device can be established. It is possible to perform error control that is excellent in economic efficiency and maintainability without lowering throughput.

[0023]

FIG. 2 is a diagram for explaining an example of control according to the first embodiment of the present invention. This embodiment corresponds to the invention of claim 1 and shows an ARQ (automatic repeat request) frame synchronization procedure. In the figure, first, a signal for synchronization, which is described as ARQFS burst in the figure, is transmitted from the mobile station to the connection device via the base station.

The connection device, which has received the signal via the base station, establishes synchronization of a signal from the mobile device in the network direction (hereinafter referred to as an upstream signal). Next, in order to establish synchronization of a signal from the connection device to the mobile station (hereinafter referred to as a downlink signal), the connection device transmits the signal to the mobile station via the base station to the mobile station.
A signal for synchronization, which is described as S burst, is transmitted.

The mobile station receiving this compares the correct phase with the phase of the signal from the connection device and detects the phase difference. The phase difference is transmitted to the connecting device by using the ARQFS burst.

The connection device can also establish synchronization of the frame of the downlink signal by modifying the phase of the frame of the downlink signal based on the notified phase difference. In order to confirm this synchronization establishment at the mobile station, the downlink ARQFS burst is transmitted again to the mobile station, and when the mobile station can confirm the synchronization, the normal communication is started.

FIG. 3 is a diagram for explaining another example of control according to an embodiment of the present invention. This embodiment also corresponds to the invention of claim 1, and shows an ARQ frame synchronization procedure. This embodiment is different from the previous embodiments in that an error occurs in the wireless transmission path. When the signal transmitted from the mobile station to the base station is incorrect, an error is detected when performing error control.

However, the error generated in the wireless transmission line is identified by using the signal, and the frame phase is not corrected by using the information of the phase difference included in the signal received by the connection device, and the previous transmission is performed. Transmit at the same phase as the phase. Since the phase of the signal received by the mobile station is incorrect, the phase difference is notified to the connection device again.

By doing so, frame synchronization can be established in the wireless section even if an error occurs. FIG.
FIG. 8 is a diagram illustrating an example of control according to another embodiment of the present invention. This embodiment corresponds to the invention of claim 2, and ARQ
The frame synchronization procedure is shown. A signal for synchronization, which is referred to as an ARQFS burst, is transmitted from the connection device to the mobile station via the base station.

The mobile station receiving this compares the correct phase with the phase of the signal from the connection device and detects the phase difference. The phase difference is transmitted to the connecting device by using the ARQFS burst.

The connection device can also establish synchronization of the downlink signal frame by correcting the phase of the downlink signal frame based on the notified phase difference. In order to confirm this synchronization establishment at the mobile station, the downlink ARQFS burst is transmitted again to the mobile station, and when the mobile station can confirm the synchronization, the normal communication is started.

FIG. 5 is a diagram for explaining another example of control according to another embodiment of the present invention. This embodiment also corresponds to the invention of claim 2 and shows an ARQ frame synchronization procedure. This embodiment is different from the previous embodiments in that an error occurs in the wireless transmission path.

When the signal transmitted from the base station to the mobile station is erroneous, an error is detected when performing error control. Therefore, the signal is used to identify the error occurring in the wireless transmission path.
The phase difference is notified to the connecting device again. The connection device corrects the phase of the downlink signal to be transmitted based on the phase difference information obtained from the signal that has arrived without error. By doing so, frame synchronization can be established even if an error occurs in the wireless section.

[0034]

As described above, according to the present invention,
Since it is not necessary to constantly transmit information for frame synchronization for performing error control (automatic retransmission or error correction by block code) between the connection device and the mobile station, call throughput is improved. It does not lower. Moreover, since the error controller can be integrated into a connection device close to the network, and it is not necessary to provide an error controller in each base station, the base station is not enlarged and the system is economical. There is an advantage that can be configured.

[Brief description of drawings]

FIG. 1 is a diagram showing a principle configuration of the present invention.

FIG. 2 is a diagram illustrating an example of control according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating another example of control according to the embodiment of the present invention.

FIG. 4 is a diagram illustrating an example of control according to another embodiment of the present invention.

FIG. 5 is a diagram illustrating another example of control according to another embodiment of the present invention.

FIG. 6 is a diagram showing an example of a conventional mobile communication system.

FIG. 7 is a diagram showing another example of a conventional mobile communication system.

[Explanation of symbols]

 1 Network 2 Connection Device 3-1 to 3-n Base Station 4-1 to 4-n, 5 Mobile Station 6,7 Error Controller 8,9 Synchronous Circuit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location H04L 7/08 A H04Q 7/22 7/24 7/26 7/30

Claims (2)

[Claims] 1. In a wireless communication system for performing bidirectional communication between a mobile station and a base station by time division multiplexing (TDMA), the base station is connected to a network via a connection device, and the mobile station is wirelessly transmitted. It has a retransmission control circuit or an error correction circuit as an error controller for coping with an error that occurs in a channel, and has an error controller in the connection device that faces the error controller of the mobile station and performs error correction control. , A synchronization signal for notifying a frame phase indicating a phase relationship between a bit string (information) to be transmitted and a time-division multiplexed signal in a wireless section from a mobile station to a connection device having the error controller via a base station. The connection device, which has transmitted the synchronization signal and has received the synchronization signal, recognizes the frame phase of the wireless section based on the signal and inputs the frame phase to the error controller to enable error control. In order to establish synchronization of the frame phase of the signal directed to the mobile station, the synchronization signal is transmitted from the connection device via the base station, and the mobile station that receives the synchronization signal transmits the synchronization phase signal from the connection device to the phase of the frame in the wireless section. It detects the phase difference of the signal of the signal, notifies the connected device of the phase difference via the base station, and controls the frame phase of the signal transmitted from the connected device to the mobile station based on the notified phase difference. Characterized frame synchronization method. 2. In a wireless communication system for performing bidirectional communication between a mobile station and a base station by time division multiplexing (TDMA), the base station is connected to a network via a connection device, and the mobile station is wirelessly transmitted. It has a retransmission control circuit or an error correction circuit as an error controller for coping with an error that occurs in a channel, and has an error controller in the connection device that faces the error controller of the mobile station and performs error correction control. , A synchronization signal for notifying a frame phase indicating a phase relationship between a bit string (information) to be transmitted and a time-division-multiplexed signal in a wireless section from a connection device to a mobile station having the error controller via a base station. The mobile station that has transmitted and received the synchronization signal detects the phase difference between the phase of the frame in the wireless section and the signal from the connection device, and notifies the connection device of the phase difference via the base station. Phase difference Frame synchronization method, characterized in that for controlling the frame phase of a signal to be sent to the mobile station from the connection apparatus on the basis.