JPH02244838A - Tdma communication system - Google Patents

Abstract

PURPOSE:To automatically perform adjustment for a burst timing during the transmission/reception of data by inserting a pattern for setting the burst timing in data transmitted from a base station with a constant cycle, and performing the transmission/reception of the data by detecting the bust timing of its own station at a subscriber station side. CONSTITUTION:The patterns BT(1)-(5) for setting a subscriber station burst timing are inserted to transmission signals of multiframe constitution from the base station with a constant cycle, and are sent to each subscriber station. Each subscriber station side detects the burst timing of its own station, and performs the reception of the data from the base station and the transmission of the data to the base station based on the burst timing. Thereby, a #2 subscriber station can be obtained the burst timing based on the pattern BT(2) for setting the burst timing at every constant cycle even in performing the reception, and performs the transmission/reception of the data with the burst timing.

Description

[Detailed Description of the Invention] [Summary] Regarding a method for setting the transmission and reception timing at a subscriber station that performs TDMA communication with a base station, it is possible to automatically adjust the burst timing during data transmission and reception. For this purpose, burst timing setting patterns for each subscriber station are inserted at regular intervals into the multi-frame data transmitted from the base station, and each subscriber station can set its own burst timing. The base station is configured to detect the burst timing and perform data transmission and reception with the base station based on the burst timing.

(Industrial Application Field) The present invention relates to a TDMA communication system, and particularly relates to a base station and a TDMA communication system.
This relates to a method for setting transmission and reception timing at a subscriber station that performs MA communication.

In TDMA subscriber wireless communications, etc., as the number of subscriber stations increases and the amount of data increases, the extraction timing of the local station's time slot (hereinafter referred to as burst timing) is )
It is now necessary to easily set and adjust the

[Conventional technology]

Fig. 3 shows the conventional burst timing setting method in TDMA communication, where II (a) is an example of the transmission data δ sent from the master station, FT is the frame timing, and #1 ~#6 is the data addressed to each subscriber station from #1 to #6! A predetermined number of these frames are assembled to create one multi-frame, and each frame 1. If frame timing = z) FT
7 races 1. It is constantly being synchronized.

In TDM and A communication in Kozai, data is sent from the master station and in the data of the downlink wireless link (C), for example, (c) in the same figure.
As shown, the data of the own station is calculated based on the burst timing I#3 that is generated independently at each subscriber station.
C1° is used here.C1° is used here. The paste timing is as shown in the same figure ←), which is set at the initial stage of line establishment. -17, current station and joining f: station r, place the coordinator of Rezowa,
The number of bits to start at and end at is adjusted in increments of l focus and set to the optimum position 1.

[Problems to be Solved by the Invention] Since the conventional burst timing setting is fixed at L2 after the first light is set, under some conditions the burst timing as shown in FIG.
If the deviation in l'V-strike timing exceeds the permissible range (for example, if the l'V-strike timing difference exceeds the permissible range (for example, when the d-line is tuned in the winter and the d-line is warmed up in the summer due to the temperature Kl), Occur or
In case C) where a discrepancy occurs under the nine individual conditions of 7t, only the data of the C1 station is 1':, 7K<data of other stations! ,'', will also have an effect on the H dog (+),, it will definitely need to be readjusted, but it will be readjusted using the method of passing the conventional bar, STAI Mini 7 Nog. W is executed by stopping sending and receiving data; rNI V
), and data must be transmitted continuously, which is very difficult in normal T DNA communication.

At that time, there was a problem that a certain level of training was required for the adjustment. The present invention aims to provide a DMA communication method that can automatically adjust the berth timing. TD related to
In the MA communication system, as shown in Figure 1 (Xl), the subscriber station burst timing setting pattern (BT ■ - ■ in if leap (a)) is included in the multi-frame transmitted signal from the base station. It is inserted at regular intervals and sent to each subscriber station.

Each subscriber section checks the East timing of its own station.
! 1μ, 1-25゛... Based on the burst timing, the base station receives data and bases! ! ! Sends data to the server.

For example, the joining η station of #2 uses the above-mentioned () k-,,1 reference timing data as shown in FIG. Based on the base +1 (Mini knob -', l'!, /chi frame constant path 1 death) I was able to get 7 while receiving data, and by this burst timing I sent and received F ( Embodiment Example The first example) shows an example of the burst timing setting pattern used in the TI'') MA communication system according to the present invention. Subscriber station identification code ID and stop bit S in middle r
B and a burst area between them.

Figure 2 shows the burst timing settings and
An example configuration of a base station and a subscriber station when using an intern is shown.

First, in the 21st expansion (a) showing the configuration of the base station -11
1.1 frame timing generator, subscriber 1.1
'・) Generate a wireless line multi-frame consisting of a predetermined number of frames including time slots 5 and 5.
7.Pane generation unit 2 for burst timing setting;
and downlink wireless ft, -J! , and sent to the format generation section 3.

・)'~S I Tie ≧ 5 In the pattern generation unit 2, a pattern from the identification code 1D to the stop bit SI3 to be inserted into the received subscriber station time slot is generated for each subscriber station. is multiplexed at the same timing as the burst timing of the downlink radio frame format generator 3.
will be sent to. Downlink radio frame format generation unit 3
Now, a synchronization signal (FT
), each subscriber station data maintenance information, order wire, and other data are inserted and sent.

Note that the pattern for setting the burst timing may be randomly inserted as long as it is a time slot that corresponds to the subscriber station, but in order to make the burst timing more reliable, it is necessary to insert the burst timing setting pattern at regular intervals within the normally used multiframe. It is necessary to insert each time.

In this case, the burst timing at which the pattern is set can be modified in various ways other than that shown in FIG.

In FIG. 2(b) showing the configuration of the subscriber station, 4 and 5
6 is an identification code detection unit and a stop bit detection unit that input downlink wireless data, and 6 is a burst timing generation unit that receives output signals of the identification code detection unit 4 and stop bit detection unit 5.7 is a burst timing generation unit. 6 is a burst timing holding/protection unit that holds and protects the burst timing generated; 8 is a local station data extraction unit that is connected to the burst timing holding/protection unit 10 and extracts own station data from the downlink wireless link; 9 is connected to the burst timing maintenance/protection unit 7, and the uplink jI! 9 inserts its own data into the uplink radio line. ! Line frame format generation unit.

The identification code ID of the burst timing setting pattern inserted into the data from the downlink is determined by the m-specific code detection unit 4.
The stop bit SB is detected by the stop bit detection section 5.

Then, the burst timing generation unit 6 that receives the detection signals of the identification code ID and stop bit SB generates a burst timing based on these and sends it to the burst timing retention/protection unit 7 to maintain and protect the burst timing. The section 7 holds this periodically detected burst timing for one frame to several frames.
The burst timing is safely confirmed by receiving several burst timing setting patterns.

This held burst timing is determined by the own station data MUX.
/DMUX timing, and at this timing, the own station data extracting unit 8 extracts own station data from the downlink, and the uplink frame format creation unit 9 inserts own station data into the uplink. To accurately transmit and receive data between a base station and a subscriber station.

Although the above embodiment has been explained using an example of a subscriber station wireless line, the present invention is not limited to this and can be applied to a wired line as well.

〔Effect of the invention〕

As described above, in the TDMA communication system according to the present invention, burst timing setting patterns for each subscriber station are inserted at regular intervals into the multi-frame data transmitted from the base station, and the burst timing setting pattern for each subscriber station is inserted at regular intervals. Since the system is configured to detect the burst timing of its own station and transmit/receive data, it is possible to prevent phase shifts in the burst timing due to temperature changes, etc., and this timing adjustment is performed while transmitting/receiving data. This eliminates data loss and retransmission, and also eliminates the time and experience required to adjust burst timing.

[Brief explanation of drawings]

FIG. 1 is a signal waveform diagram showing the principle of the TDMA communication system according to the present invention, FIG. 2 is a block diagram showing an embodiment of a base station and a subscriber station in the TDMA communication system according to the present invention, and FIG. 1 is a signal waveform diagram showing a conventional TDMA communication method. In FIG. 1, BT■~■...Burst timing setting pattern, FT...Frame timing, 10...Identification code ID, 3B...Stop focus. In the figures, the same reference numerals indicate the same or equivalent parts. agent

Claims (1)

[Claims] A burst timing setting pattern for each subscriber station is inserted at regular intervals into multi-frame data transmitted from a base station, and each subscriber station sets its own burst timing. A TDMA communication method is characterized in that data is transmitted and received with the base station based on the burst timing.