Multiplex communications – Communication over free space – Portable address responsive receiver
Reexamination Certificate
1999-01-19
2003-04-22
Urban, Edward F. (Department: 2685)
Multiplex communications
Communication over free space
Portable address responsive receiver
C370S336000, C370S337000, C370S539000, C714S006130, C714S006130, C714S758000
Reexamination Certificate
active
06553008
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a multidirectional time-division multiplexing wireless data communications system, and more specifically to a multidirectional time-division multiplexing wireless data communications system for fixedly assigning a wireless time slot used between a first station and a second station, for example, between a parent station and a child station, and establishing communications between plural pieces of data terminal equipment connected to the stations.
2. Description of the Related Art
In a wireless system for establishing multidirectional time-division multiplexing communications, the one-to-N time-division multiplexing communications are established between a parent station and a plurality of child stations which communicate with the parent station.
At this time, in the telephone communications using a system in which both telephone communications and data communications are set, a channel assigning process is controlled by a demand-assign system for assigning a wireless communications channel between the parent station and the child stations only when a call is issued from the parent station or the child stations.
In the data communications, the channel assigning process is controlled by the pressing system for preliminarily and fixedly assigning a wireless communications channel for use in the data communications between data terminal equipment connected to the parent station and data terminal equipment, connected to a child station, for communicating with the data terminal equipment connected to the parent station.
FIG. 5
is a block diagram of the configuration of the conventional multidirectional time-division multiplexing wireless data communications system. The multidirectional time-division multiplexing wireless data communications system shown in
FIG. 5
includes a parent station
1
, plural pieces of data terminal equipment
1
a
,
1
b
, and
1
c
connected to the parent station
1
, child stations
10
,
11
, and
12
for performing wireless communications with the parent station
1
, and data terminal equipment
10
a
,
11
a
, and
12
a
connected to the child stations
10
,
11
, and
12
.
The data communications are performed by a time-division multiplexing system (hereinafter referred to as a TDM system) in the;downstream from the parent station
1
to the child stations
10
through
12
while the data communications are performed by a time-division multiple attachment system (hereinafter referred to as a TDMA system) in the upstream from the child stations
10
through
12
to the parent station
1
.
Described below are the operations in which the data terminal equipment
1
a
and the data terminal equipment
10
a
; the data terminal equipment
1
b
and the data terminal equipment
11
a
; and the data terminal equipment
1
c
and the data terminal equipment
12
a
communicate with each other respectively.
First, a wireless time slot for use as a wireless communications channel is preliminarily and fixedly assigned to each data terminal equipment.
That is, a wireless time slot TS
0
is fixedly assigned to the data terminal equipment
1
a
and the data terminal equipment
10
a
, a wireless time slot TS
1
is fixedly assigned to the data terminal equipment
1
b
and the data terminal equipment
11
a
, and a wireless time slot TS
2
is fixedly assigned to the data terminal equipment
1
c
and the data terminal equipment
12
a.
As shown in
FIG. 6
, the wireless time slot TS
0
, the wireless time slot TS
1
, and the wireless time slot TS
2
are assigned to separate positions without overlapping each other about a time axis, and the signals transmitted through respective time slots do not crash each other.
When a call is issued to any data terminal equipment in the multidirectional time-division multiplexing wireless data communications system, the data communications can be established between corresponding data terminal equipment because a wireless time slot is assigned to each data terminal.
In the downstream data transmission, data signals transmitted from the data terminal equipment
1
a
, the data terminal equipment
1
b
, and the data terminal equipment
1
c
are input to the parent station
1
, multiplexed by the parent station
1
, and then transmitted to the child station
10
, the child station
11
, and the child station
12
by the TDM system.
That is, a data signal from the data terminal equipment
1
a
is multiplexed to the wireless time slot TS
0
, a data signal from the data terminal equipment
1
b
is multiplexed to the wireless time slot TS
1
, and a data signal from the data terminal equipment
1
c
is multiplexed to the wireless time slot TS
2
. Thus, the multiplexed burst data signals are transmitted to the child stations
10
through
12
by the TDM system.
The same signals are transmitted to the child stations
10
through
12
.
Each of the child stations
10
through
12
retrieves, by separating and selecting, the data signal addressed to itself, and transmits the data signal to the connected data terminal equipment.
That is, the data signal multiplexed to the wireless time slot TS
0
is separated by the child station
10
and transmitted to the data terminal equipment
10
a
, the data signal multiplexed to the wireless time slot TS
1
is separated by the child station
11
and transmitted to the data terminal equipment
11
a
, and the data signal multiplexed to the wireless time slot TS
2
is separated by the child station
12
and transmitted to the data terminal equipment
12
a.
In the upstream data transmission, a data signal from the data terminal equipment connected to the child station is multiplexed to a wireless time slot assigned by each child station, and transmitted to the parent station as a burst signal by the TDMA system.
That is, the data signal from the data terminal equipment
10
a
is ;input to the child station
10
, multiplexed to the wireless time slot TS
0
, and transmitted to the parent station
1
.
Similarly, the data signal from the data terminal equipment
11
a
is input to the child station
11
, multiplexed to the wireless time slot TS
1
, and transmitted to the parent station
1
. The data signal from the data terminal equipment
12
a
is input to the child station
12
, multiplexed to the wireless time slot TS
2
, and transmitted to the parent station
1
.
The parent station
1
separates and retrieves the data signal from each of the child stations
10
through
12
, and transmits the corresponding data signal to the connected data terminal equipment.
That is, the data signal multiplexed to the wireless time slot TS
0
is transmitted to the data terminal equipment
1
a
, the data signal multiplexed to the wireless time slot TS
1
is transmitted to the data terminal equipment
1
b
, and the data signal multiplexed to the wireless time slot TS
2
is transmitted to the data terminal equipment
1
c.
For convenience in explanation in reference to
FIG. 5
, the number of child stations is set to 3, and the number of pieces of data terminal equipment connected to each of the child stations
10
through
12
is set to 1. The circuit, signal line, etc. that are not specifically important are omitted here. However, the similar operations are performed on the case in which the number of child stations is other than 3, and in which plural pieces of data terminal equipment are connected to one child station.
Described below is a one-to-one data transmitting operation.
FIG. 7
shows the most popular conventional technology of this type.
In the first station, according to a timing signal generated by a timing signal generation circuit (TIM GEN)
22
, a low-speed continuous signal SIG
1
input from the data terminal equipment is input to a continuous/burst signal conversion circuit (C/B CONV)
21
in which the data is stored.
The timing signal generation circuit
22
generates a timing signal required when the low-speed continuous signal SIG
1
is periodically input to the continuous/burst signal conversion circuit
21
.
The data stored
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