Multiplex communications – Communication over free space – Combining or distributing information via code word channels...
Reexamination Certificate
1998-06-23
2002-07-23
Yao, Kwang Bin (Department: 2669)
Multiplex communications
Communication over free space
Combining or distributing information via code word channels...
C455S435100
Reexamination Certificate
active
06424640
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to status information in wireless (mobile) communication systems. More particularly, it relates to a method for storing the status information of a transceiver in a base station of the wireless communication system.
2. Description of the Related Art
A PCS (Personal Communication Services) system and a CDMA (Code Division Multiple Access) system comprise a number of Base Transceiver Systems (BTSs) which provide services to Mobile Stations, a Base Station Controller (BSC), a Base Station Management System (BSM) which manages a number of BSCs, a Mobile Switching Center (MSC), and a Location Register (LR) system.
The area that each BTS services is called a cell, and the cell is divided into several sectors. The cell is expanded to BTS, BSC, MSC service areas in order.
In a mobile telecommunication system, the MSC system and other systems generally make up a Base Station Subsystem (BSS). The BSS includes the BSM, BSC and BTS in order of precedence. The main processor of the BSC is called a Call Control Processor (CCP) and the main processor of the BTS is called the BTS Control Processor (BCP).
The base station transceiver is a module included in the radio frequency unit of the base station subsystem (BSS) in a CDMA mobile system. The transceiver includes a Transceiver Master Control Unit (XMCU) controlled by a Transceiver Interface Processor (TIP), and a Transceiver Unit (XCVU) controlled by a Transceiver Unit Processor (TRUX).
The TIP receives data from the BCP to generate RF signals and transmits them to the transceiver. The TIP refers to the processor that controls the XMCUs, and the TIPX refers to a software block which is loaded in the TIP. The TIPX also receives transceiver status information and alarm information from the transceiver and transmits the same to the BCP. The TIP is a dual processor having two sides (e.g., A and B), each functioning as an independent processor. That is, one side (e.g., A) is active while the other side (e.g., B) is in a standby state. When a fault occurs in the active side A for whatever reason, the side B (standby side) is activated and side A is placed in the standby state. The TIP downloads the TIPX program from the BCP and activates the respective side when a fault occurs.
The TRUX receives status information of a base station transceiver from the TIPX, and reports the frequency of the transceiver, an output adjustment, an alarm detection and the transceiver status to the TIPX. At the same time, the TRUX performs the function of displaying the transceiver status on an LED such as a 7-segment attached to the front side of each XCVU board. The TRUX also performs monitoring of equipment or non-equipment status of each XCVU board in the base station transceiver, and monitors and controls the PLL locking status and output adjustment.
A base station transceiver can perform a frequency assignment service in a sector.
The BTS Status Handling (BSHX) block, which is a status management block in the BCP, receives a status information message of the base station transceiver from the TIPX, and manages the status of the transceiver. The status of a base station transceiver affects the management of a subcell on the basis of the identifier of the sector including a specific transceiver and the identifier of the CDMA channel. Thus, if the status of a base station transceiver is abnormal, the status of the corresponding subcell also becomes abnormal.
There are several types of base station systems according to the number of the TIPXs and transceivers. A conventional base station transceiver belongs to one of two types (i.e., type
1
or type
2
).
A type
1
base station, of an earlier standard base station type, supports a maximum of three sectors and four frequency assignments. To implement five or more frequency assignments, a rack of the same form is needed. The type
2
base station, of the micro base station type, supports a sector, a frequency assignment and no redundant transceiver.
FIG. 1
illustrates the stored status information of a transceiver in a conventional type
1
base station. As illustrated, rack
1
(
110
) includes TIP
0
, TIP
1
and TIP
2
which each perform the frequency assignment
0
(FA
0
), the frequency assignment
1
(FA
1
), the frequency assignment
2
(FA
2
) and the frequency assignment
3
(FA
3
), and rack
2
(
120
) includes TIP
3
, TIP
4
and TIP
5
which each perform the frequency assignment
4
(FA
4
), the frequency assignment
5
(FA
5
), the frequency assignment
6
(FA
6
) and the frequency assignment
7
(FA
7
). Each TIPX has a redundant (R) transceiver (XCVR
0
) and four transceivers (XCVR
1
-XCVR
4
) for each of the respective frequency assignments. In the type
1
system, a rack includes three TIPXs and the transceivers under each of the TIPXs. As illustrated in
FIG. 1
, two racks (
110
and
120
) are used to support eight frequency assignments (FA
0
-FA
7
).
FIG. 2
illustrates the stored status information of a transceiver in a conventional type
2
base station. As illustrated, a rack is composed of a TIPX and a transceiver for processing a frequency assignment.
A BSHX block has a sector identifier such as &agr;, &bgr;, &ggr; for each transceiver, and a CDMA channel identifier such as
0
,
1
,
2
,
3
,
4
,
5
,
6
,
7
. The BSHX block stores the status information of a transceiver from the TIPX in the position designated by the identifiers as a specified table.
FIG. 3
illustrates a status information table of a TIPX and a transceiver stored in the BSHX block. As illustrated, the status information according to the identifier of each TIPX and the identifier of each transceiver are stored in the specified format. In case of type
1
and type
2
system, i is an identifier of the TIPX and j is an identifier of a transceiver, where [i, j] is a key to retrieve the status information in the table.
In a type
1
system, the status information from a transciever
0
(XCVR
0
) to a transceiver
4
(XCVR
4
) in each TIPX is stored in the position of the table according to each identifier, and the transciever
0
(XCVR
0
) becomes redundant. But in a type
2
system, only the status information of a transciever
0
is necessary, and transciever
0
is not redundant.
According to an improvement of the system, the type
2
system has been substituted by a type
3
and type
4
system. In these systems, the maximum number of transceivers is increased to six per conventional TIPX and there is no redundant transceiver, so the message format and the relation scheme of the database are changed.
FIG. 4
illustrates the stored status information of a transceiver in a type
3
base station. As illustrated, rack
1
(
410
) can support a frequency assignment (FA
0
) and three sectors (&agr;,&bgr;,&ggr;) and rack
2
, rack
3
and rack
4
(
420
,
430
,
440
) can support two frequency assignments and three sectors for each frequency assignment. In
FIG. 4
, four racks are used to support seven frequency assignments (FA
0
-FA
6
) and three sectors. Thus, the type
3
system can support a maximum of two frequency assignments and three sectors in a rack.
If a system supporting a frequency assignment and three sectors is needed, a TIPX and three transceivers can be used.
FIG. 5
illustrates the stored status information of a transceiver in a type
4
base station. As illustrated, a type
4
system is a system of small Omni-directional base station type and rack
1
(
510
) can support three frequency assignments (FA
0
-FA
2
) and rack
2
(
520
) can support four frequency assignments (FA
3
-FA
6
). Therefore, seven frequency assignments can be supported using two racks.
A database to store the status information of a base station transceiver is physically organized according to the system configuration. Thus, if the system configuration is changed, the message format used to communicate with the TIPX must also be changed. Therefore, according to the above, a table in the corresponding database should be changed which makes and it is necessary to find an identifi
Dilworth & Barrese LLP
Jones Prenell
Samsung Electronics Co,. Ltd.
Yao Kwang Bin
LandOfFree
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