Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2001-03-01
2004-07-27
Urban, Edward F. (Department: 2685)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S561000, C370S342000, C375S222000
Reexamination Certificate
active
06768912
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a radio base station apparatus for a mobile communication, in which communication is carried out on the basis of a code division multiple access (CDMA) method using spectrum spreading technique for a radio transmission.
2. Description of the Related Art
FIG. 1
shows a configuration example of a conventional radio base station apparatus in such a CDMA method. A radio base station apparatus
1
shown in
FIG. 1
is composed of a call process & monitor controlling circuit
4
and shelves
2
and
3
. The shelf is a unit in which the processes such as generation, spreading, and transmission of a transmission signal are controlled within the radio base station apparatus.
The call process & monitor controlling circuit
4
carries out the monitor and control of a state within the radio base station apparatus, resource management of a channel, and connection of a control call with respect to the control of origination and arrival.
The shelves
2
and
3
have the same configuration. Hereinafter, the shelf
2
will be described. Each of channel coding process circuits
6
a
and
6
b
receives a coding process data from the call process & monitor controlling circuit
4
, and generates a transmission baseband signal. The coding process data is the data such as control data, user data of voice and packets, and data indicative of a kind of channel for carrying these data. Each of the channel coding process circuits
6
a
and
6
b
has units whose number corresponds to the number of channels. Each of merging circuits
7
a
and
7
b
merges the transmission baseband signals outputted from the channel coding process circuits
6
a
and
6
b
. Transmission signal processing circuits
5
a
and
5
b
spread and modulate the transmission baseband signals outputted from the merging circuits
7
a
and
7
b
, respectively. A radio transmission processing circuit
8
a
synthesizes and adds transmission spreading signals outputted from the transmission signal processing circuits
5
a
and
5
b
, and carries out orthogonal modulation, radio frequency conversion and amplification, and outputs a radio transmission signal from an antenna
9
a
. The radio transmission processing circuits
8
a
and
8
b
up-converts the transmission spreading signals to have radio transmission frequencies different from each other.
The shelf
2
receives and outputs a control signal as well as a data to be sent. The channel coding process circuits
6
a
and
6
b
and the transmission signal processing circuits
5
a
and
5
b
receive and output data such as coding process data, spreading process data, control data, and status data through a control bus from and to the call process & monitor controlling circuit
4
. The spreading process data is a spreading code used when the transmission signal processing circuits
5
a
and
5
b
carry out the spreading modulation. Also, the transmission signal processing circuits
5
a
and
5
b
mutually receive and output an alarm signal when a fault has occurred.
The configuration and operation of the shelf
3
are similar to those of the shelf
2
.
FIG. 2
is a block diagram showing a conventional configuration example of the transmission signal processing circuit
5
a
to
5
d
in the radio base station apparatus shown in FIG.
1
. The respective transmission signal processing circuits have the same configuration. Here, only the transmission signal processing circuit
5
a
will be described. In
FIG. 2
, channel data separating circuit
11
separates individual channels from a transmission baseband signal, in which time divisional multiplexing is carried out to data for a plurality of channels received from the merging circuit
7
a
, in accordance with a channel data received from a CPU
20
, and converts into a user data corresponding to a data rate for each user, and then outputs to an intra shelf transmission spreading process circuit
12
. As described later, the intra shelf transmission spreading process circuit
12
has a current use system spreading circuit and a standby system spreading circuit. The channel data is the data to determine whether each user data should be processed by the current use system spreading circuit or the standby system spreading circuit. The intra shelf transmission spreading process circuit
12
carries out the spreading modulation to a plurality of user data whose data rates are different from each other, in accordance with a spreading process data (spreading code) received from the CPU
20
, and outputs a spread signal for each user to an addition synthesizer
15
d.
The addition synthesizer
15
d
adds all the spread signals for the respective users to output to a format converter
17
c
. A synchronous pattern generating circuit
18
c
generates a synchronous pattern to output to the format converter
17
c
. The format converter
17
c
carries out an insertion of the synchronous pattern into the spread signal, and converts the spread signal to have a format adaptive for the transmission to the radio transmission processing circuit
8
a
. The format converter
17
c
outputs the spread signal on which the format conversion is carried out, as a transmission spread signal, through an output stopping circuit
19
c
to the radio transmission processing circuit
8
a.
When a fault has occurred in the transmission signal processing circuit
5
a
, an alarm detecting circuit
21
detects the fault. The alarm detecting circuit
21
outputs an alarm signal to the output stopping circuit
19
c
, the CPU
20
and the intra shelf transmission spreading process circuit
12
of the other transmission signal processing circuit
5
b
in the intra shelf (shelf
2
). The intra shelf transmission spreading process circuit
12
in the transmission signal processing circuit
5
a
receives an alarm signal from the alarm detecting circuit
21
in the transmission signal processing circuit
5
b
when the fault has occurred in the transmission signal processing circuit
5
b.
When receiving the alarm signal from the alarm detecting circuit
21
, the output stopping circuit
19
c
sets an output bus to a high impedance state, and stops the data output.
The intra shelf transmission spreading process circuit
12
has the current use system spreading circuit and the standby system spreading circuit. The current use system spreading circuit carries out a spreading process to the user data in the current use system received from the channel data separating circuit
11
. The standby system spreading circuit carries out the spreading process to the user data in the standby system. Usually, the intra shelf transmission spreading process circuit
12
fixes the amplitude of a signal processed by the standby system spreading circuit to 0. However, the intra shelf transmission spreading process circuit
12
cancels the 0-fixation of the amplitude of the signal processed by the standby system spreading circuit, when receiving the alarm signal from the transmission signal processing circuit
5
b
(namely, when a fault has occurred in the other transmission signal processing circuits within the intra shelf).
The CPU
20
notifies the status data of the transmission signal processing circuit
5
a
to the call process & monitor controlling circuit
4
through the control bus, and receives the control data from the call process & monitor controlling circuit
4
.
The configurations and operations of the transmission signal processing circuits
5
b
to
5
d
are similar to those of the transmission signal processing circuit
5
a.
In the radio base station apparatus shown in
FIG. 1
, any channel data separating circuit
11
of the transmission signal processing circuits
5
a
and
5
b
receives the transmission baseband signals outputted by the channel coding process circuits
6
a
and
6
b
. Then, in accordance with the channel data, the channel data separating circuit
11
of the transmission signal processing circuit
5
a
determines the user data to be outputted from the transmission signal processing circ
Jackson Blane J.
NEC Corporation
Urban Edward F.
Young & Thompson
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