Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2000-07-06
2003-06-10
Appiah, Charles N. (Department: 2682)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C370S350000
Reexamination Certificate
active
06577878
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates in general to base transceiver stations of digital mobile telecommunication systems, and more particularly to a base transceiver station of a digital mobile telecommunication system which is separated into a remote site base transceiver station (referred to hereinafter as a remote site BTS) including a radio frequency unit (referred to hereinafter as RFU) and a hub site base transceiver station (referred to hereinafter as a hub site BTS) including components other than the RFU and wherein a base transceiver station interconnection network is used to control the remote site BTS, so that the entire base transceiver station can be installed under the optimum conditions to maximize the quality of speech.
2. Description of the Prior Art
In a digital mobile telecommunication system such as a personal communication system (PCS) or digital cellular system (DCS), generally, a base transceiver station functions to transmit and receive data and voice over a radio channel, control a terminal (e.g., a PCS or DCS terminal), monitor the quality of speech of the terminal and interconnect the terminal and a base station controller (referred to hereinafter as BSC). Namely, the base transceiver station is located between a mobile station and a BSC to interface between wired and wireless channels and perform main functions associated with a radio link. For example, the main functions associated with the radio link may be a function of allocating and managing forward link power to code division multiplex access (CDMA) frequency, channel and frame option resources, a function of processing an outgoing call signal, incoming call signal, soft handoff call signal and hard handoff call signal and a function of receiving and managing global positioning system (GPS) timing information and providing system timing information to the mobile station and base transceiver station.
The base transceiver station is further adapted to perform a function of transmitting and receiving radio signals over a pilot channel, synchronization channel, access channel, paging channel and traffic channel, a function of routing traffic and control information to the BSC and error detection/statistical information collection/report functions.
With reference to
FIG. 1
, there is shown in block form the construction of a conventional base transceiver station of a digital mobile telecommunication system, which is denoted by the reference numeral
20
. As shown in this drawing, the base transceiver station
20
comprises a base transceiver station control processor (referred to hereinafter as BCP)
21
for managing and controlling the entire operation of the base transceiver station
20
, a base transceiver station interconnection network (referred to hereinafter as BIN)
22
for performing a packet router function between the base transceiver station
20
and a BSC
10
through an E1 line or T1 line and interfacing high-level data link control (HDLC) packet data between processors in the base transceiver station
20
, a time and frequency unit (referred to hereinafter as TFU)
23
for generating a reference frequency and timing synchronization signal to synchronize the processors in the base transceiver station
20
and perform timing synchronization with an adjacent base transceiver station, a digital unit (referred to hereinafter as DU)
24
for modulating and demodulating data and voice signals being transmitted and received over a CDMA channel, and an RFU
25
for converting an ultrahigh frequency (UHF) signal from a mobile station into an intermediate frequency (IF) signal, transferring the converted IF signal to the DU
24
, converting an IF signal from the DU
24
into a UHF signal, amplifying the converted UHF signal to a predetermined level and radiating the amplified UHF signal over the air.
A description will hereinafter be given of detailed functions of the above-mentioned components of the conventional base transceiver station
20
of the digital mobile telecommunication system.
The BIN
22
provides an interface with the BSC
10
and an internal communication line to the base transceiver station
20
on the basis of the packet routing function.
The BCP
21
controls and diagnoses the entire operation of the base transceiver station
20
and performs an appropriate operation based on the diagnosed result. Further, the BCP
21
acts to download software associated with initialization of the base transceiver station
20
.
The DU
24
acts to process voice and data signals being transmitted and received to/from each terminal. To this end, the DU
24
consists of first and second DUs
24
a
and
24
b
as shown in FIG.
1
. That is, the DU
24
is adapted to process all signals associated with CDMA.
The RFU
25
includes first and second RFUs
25
a
and
25
b
for converting modulated data and voice signals from the first and second DUs
24
a
and
24
b
into RF signals, transmitting the converted RF signals to a terminal, demodulating modulated data and voice signals from the terminal, converting the demodulated signals into digital signals and transferring the converted digital signals to the first and second DUs
24
a
and
24
b,
respectively. The TFU
23
functions to receive information relating to a reference time necessary to the base transceiver station
20
from a GPS and supply the received information to the base transceiver station
20
. As a result, all units in the base transceiver station
20
are synchronized with a GPS time and thus have the same timing.
For the purpose of implementing communication from the BCP
21
to RFU
25
in the base transceiver station
20
of the digital mobile telecommunication system, inter-processor communication of the respective constituting elements must be enabled. For the inter-processor communication, a unique address must be assigned to every constituting element board. Now, a description will be given of a system for assigning addresses respectively to the processors in the base transceiver station
20
and an inter-processor communication system implemented in the base transceiver station
20
.
FIG. 2
is a view illustrating a 4-byte address system for inter-processor communication in the conventional base transceiver station
20
of FIG.
1
and
FIG. 3
is a block diagram showing a control communication system of the conventional base transceiver station
20
of FIG.
1
.
Noticeably, an HDLC packet is used for inter-processor communication in the digital mobile telecommunication system. The HDLC packet is composed of a header and data, which header contains a source address and a destination address. Each constituting element in the base transceiver station
20
of
FIG. 1
compares the destination address contained in the HDLC packet header with its unique address and receives the HDLC packet data only when the two addresses are the same. In this manner, the inter-processor communication is made in the base transceiver station
20
. Here, the unique addresses of the respective constituting elements shown in
FIG. 1
are based on the 4-byte address system as shown in
FIG. 2. A
hardware address is composed of high-order three bytes of the 4-byte address system shown in
FIG. 2 and a
software address is composed of a low-order one byte, or fourth byte, of the 4-byte address system.
The hardware address (high-order three bytes) signifies an address that can be set using jumpers on backboards of the respective constituting elements in
FIG. 1
, and the software address signifies an address that can be assigned according to a program. The hardware address is provided with a BSC identifier (ID), BTS ID, details ID, GCIN ID, test ID and trunk ID. The BSC ID is composed of high-order four bits of the first byte, the BTS ID is composed of the remaining four bits of the first byte and high-order 2 bits of the second byte (six bits in total) and the details ID is composed of the remaining six bits of the second byte. The GCIN ID is composed of high-order three bits of the third byte, the t
Kim Hae Sik
Park Seong Ik
Appiah Charles N.
Hyundai Electronics Industries Co,. Ltd.
Merchant & Gould P.C.
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