Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
1999-07-07
2002-09-24
Urban, Edward F. (Department: 2685)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S560000, C370S905000, C370S474000, C370S395430, C370S902000
Reexamination Certificate
active
06456860
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a base station equipment for forming wireless zones in a radio communication system, and a base station control equipment which performs, in cooperation with a switching center, channel control of calls that occurred in radio stations located in the wireless zones.
2. Description of the Related Art
A code division multiple access (CDMA) system, which essentially has confidentiality and interference-resistibility, is a multiple access system in which the suppression of cochannel interference and the efficient reuse of radio frequencies are possible.
In addition, such a CDMA system is positively being applied to mobile communication systems recently due to the fact that the establishment of technologies for realizing the transmitting power control with high accuracy and high response has enabled the flexible control of radio transmission characteristics by the sector zone.
FIG. 8
shows an example of configurations for a mobile communication system to which the CDMA system is applied.
In the drawing, a mobile station
73
is located in one of wireless zones
72
-
1
to
72
-m, each of which is individually formed by base stations
71
-
1
to
71
-m. Each of these base stations
71
-
1
to
71
-m is connected to a base station control station
75
via communication links
74
-
1
to
74
-m. The base station control station
75
is connected to a mobile switching center, not shown, through a certain communication links
76
-
1
to
76
-m.
The base station
71
-
1
comprises an antenna
77
-
1
and a radio processing part
78
-
1
, a modem part
79
-
1
, an assembly/disassembly part
80
-
1
, and an E1 terminating part
81
-
1
cascaded between a feeding end of the antenna
77
-
1
and an end of the communication link
74
-
1
.
Because the configuration of the base stations
71
-
2
to
71
-m is identical to that of the base station
71
-
1
, the same reference numerals, having subindexes “2” to “m”, will be assigned to corresponding composing elements hereafter and their explanation and illustration will be omitted.
The base station control station
75
comprises BTS interface parts
82
-
1
to
82
-m individually connected to the other ends of the communication links
74
-
1
to
74
m
, voice processing parts
83
-
1
to
83
-n individually connected to the above-mentioned mobile switching center via the communication links
76
-
1
to
76
-n, an ATM switch
84
disposed between the BTS interface parts
82
-
1
to
82
-m and the voice processing parts
83
-
1
to
83
-n, and a signaling processing part
85
connected to a specific port of the ATM switch
84
.
The BTS interface part
82
-
1
comprises an E1 terminating part
86
-
1
assembly/disassembly part
87
-
1
, and an ATM interface part
88
-
1
, which are cascaded between the other end of the communication link
74
-
1
and the corresponding port of the ATM switch
84
.
Because the configuration of the BTS interface parts
82
-
2
to
82
-m is identical to that of the BTS interface part
82
-
1
, the same reference numerals, having subindexes “2” to “m”, will be assigned to corresponding composing elements hereafter and their explanations and illustrations will be omitted.
The voice processing part
83
-
1
comprises an ATM interface part
89
-
1
, an assembly/disassembly part
90
-
1
, and a speech codec
91
-
1
, which are cascaded between the corresponding port of the ATM switch
84
and one end of the communication link
76
-
1
.
Because the configuration of the voice processing parts
83
-
2
to
83
-n is identical to that of the voice processing part
83
-
1
, the same reference numerals, having subindexes “2” to “n”, will be assigned to corresponding composing elements hereafter and their explanations and illustrations will be omitted.
The signaling processing part
85
comprises an ATM interface part
92
cascaded to the corresponding port of the ATM switch
84
and a signaling terminating part
93
.
In conventional examples of such configurations, the signaling processing part
85
provided on the base station control station
75
cooperates with the base stations
71
-
1
to
71
-m connected via the switch
84
, the BTS interface parts
82
-
1
to
82
-mn and the communication links
74
-
1
to
74
-m, and also cooperates with the above-mentioned mobile switching center so as to perform channel control based on a predetermined procedure.
In the channel controlling process, control information (signaling signal) transmitted by the signaling terminating part
93
(for simplicity, it is assumed that hereafter the control information is what is to be transmitted to the mobile station
73
via the base station
71
-
1
) is fed to the modem part
79
-
1
via the ATM interface part
92
, the ATM switch
84
, the ATM interface part
88
-
1
, the assembly/disassembly part
87
-
1
, the E1 terminating part
86
-
1
, the communication link
74
-
1
, the E1 terminating part
81
-
1
and the assembly/disassembly part
80
-
1
.
Besides, for the completed call occurred in the above-mentioned channel controlling process (for simplicity, it is assumed that the voice processing part
83
-
1
is assigned to the completed call by the above-mentioned mobile switching center), speech signals are fed from the mobile switching center.
In the voice processing part
83
-
1
, the speech codec
91
-
1
feeds the speech signals to the BTS interface part
82
-
1
via the assembly/disassembly part
90
-
1
, the ATM interface part
89
-
1
and the ATM switch
84
.
Here, the assembly/disassembly parts
87
-
1
to
87
-m and
90
-
1
to
90
-n cooperate with the ATM interface parts
88
-
1
to
88
-m and
89
-
1
to
89
-n, under the channel control performed by the signaling processing part
85
. The ATM switch
84
forms provided channels (paths) for connecting the BTS interface parts
82
-
1
to
82
-m with the voice processing parts
83
-
1
to
83
-n and the signaling processing part
85
(which adapts flexibly to the change of word length in the above-mentioned control information and the speech signals, and are independent from the characteristics of the control information and the speech signals have as transmission information).
In the base stations
71
-
1
to
71
-m, the E1 terminating parts
81
-
1
to
81
-m adapts to a transmission system applied to the communication links
74
-
1
to
74
-m (for simplicity, it is assumed here to be a physical interface E1 provided by application of an STM system having the transmission rate of 2,048 Mbps) and accept the control information and the speech signals fed from the base station control station
75
via the communication links
74
-
1
to
74
-m in a predetermined format.
The assembly/disassembly parts
80
-
1
to
80
-m transform the control information and the speech signals to packets in a predetermined format receivable by the mobile station
73
. The modem parts
79
-
1
to
79
-m generate primary modulated signals by modulating the carrier signals according to the packets.
The radio processing part
78
-
1
to
78
-m generate a transmission signals by performing a spreading process based on the direct sequence to the primary modulated signals respectively, and form the wireless zones
72
-
1
to
72
-m by transmitting the transmission signals through the antennas
77
-
1
to
77
-m.
In connection to this, with regard to the control information and the speech signals received from the mobile station
73
located in the wireless zone
72
-
1
, the composing elements of the base station
71
-
1
and the base station control station
75
perform, unless otherwise noted, processes which are reversible in relation to the above-mentioned processes. Hence, for simplicity, explanations of these processes are omitted.
The mobile station
73
is equipped with a variable-rate speech codec based on the QCELP method, which outputs the frames shown in FIG.
9
(
a
) as speech signals every 20 milli-seconds by encoding at a ⅛ rate during, for example, the period on which the above-mentioned completed call o
Fujitsu Limited
Katten Muchin Zavis & Rosenman
Milord Marceau
Urban Edward F.
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