JP2001189963A - Method for dynamically operating form of base station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To variably operate a form of a base station by variably operating a traffic channel resource of a base station, without restricting the operation type. SOLUTION: The method includes a base station initializing step, where reception of a base station PLD is received and a base station resource database is configured in a base station operating mode by an instruction of an operator, an air resource conversion step where an Access-FA making a call rquest is converted into a walsh code DB FA, when base station resource assignment is requested by the call request of a mobile station, an air resource assignment step where the converted walsh code DBFA is used for a key to seek an assignable walsh code and to assign the assignable walsh code, a traffic channel conversion step where the Access-FA is converted into a DB-FA, and a traffic channel assignment step where the converted DB- is used for a key, resulting in executing of the assignable traffic channel element TCE being assigned.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a code division multiple access (CDMA) mobile communication system, and more particularly, to a method capable of variably operating a base station configuration. A method for dynamically operating a base station configuration in which an operator can variably operate, maintain, and repair a base station system according to a service environment, thereby improving a system operation function. About.

[0002]

2. Description of the Related Art FIG. 1 shows a block configuration of a general CDMA mobile communication system. Mobile Station (Mobile Station:
The mobile station (MS) 10 requests a mobile communication service from a base station at the request of a subscriber while moving, and transmits the base station (Base Transceiv).
er Station (BTS) 20 performs a radio interface with the MS 10 and controls a base station (Base Station Controlle).
r: BSC) 30 processes a call processing request from the base station (BTS) 20 and controls the base station 20. And a base station management system (BS)
M) 40 performs a function of controlling the control station 30 according to an operator's command.

[0003] The base station 20 has a radio frequency (R) frequency for radio interface with the MS 10.
F) Radio frequency processing unit (Radio Frequency)
Unit: RFU) 21 and CDMA channel demodulation and error correction of each channel signal from the RFU 21 and transmission to the control station 30 side, and the encoded packet data transmitted from the control station 30 side is transmitted to each CDMA channel. After performing digital processing suitable for the base station, a digital unit (DU) 22 for transmitting to the RFU 21 and a base station control processor (BCP) 2 for performing a general control function of base station operation
3 and a base station interconnection network (BTS Int) that performs a function of connecting the DU 22 and the BCP 23 to the control station 30.
erconnection Network (BIN) 24.

FIG. 2 shows an internal block configuration of the DU 22 of FIG. One rack includes four channel cards for demodulating a signal for each channel, and includes other devices such as a power supply unit.

Here, as shown in FIG. 3, each channel card has a maximum of 18 channel elements (Channel El
ement).

A general CDMA mobile communication system as described above divides a service area into a plurality of cells, and each cell uses a frequency reuse scheme within a range that does not affect adjacent cells. Provide mobile communication services while increasing the capacity of subscribers. Then, each cell is divided into three sectors (sectors) α, β, and γ to improve service quality and expand capacity.

[0007] Further, the frequency allocated to one cell (base station) and used for service is defined as FA (frequency allo- ry).
If the service amount is large and a single FA cannot cover, a large number of FAs are allocated to the base station so that they can be operated. As a result, the operation type of each base station changes according to the service amount and characteristics.

FIG. 4 is a flowchart showing a general base station configuration operation method. As shown in FIG. 4, when a base station initialization stage ST1 in which a base station resource database is initialized by fixing the base station resource database to an initially set form, and when a base station resource allocation is requested by a call request of the mobile station 10, Access where the call request was made
_FA is used as it is to check whether a walsh code can be assigned, and as a result, an air resource assignment step (ST2, ST3) of assigning a walsh code if it can be assigned;
The ss_FA searches the base station resource database to assign a traffic channel element (TrafficChann).
El Element: TCE) is checked, and if there is an allocatable TCE, a TCE allocating step (ST4) of allocating the TCE is performed.

The general method of operating a base station as described above will be described as follows. One base station is 2FA3
When operating in the sector type, the operator must use the BSM
40 through 2FA3 sector base station PLD (Program Lo
When the base station is powered on, the base station PLD is transmitted to the base station 20 through the control station 30.

As a result, the base station 20 performs initialization using the PLD transmitted through the control station 30, but initializes the base station resource database using the corresponding FA identifier of the PLD as it is (ST1). This allows
The device unit 22 of the base station 20 is fixedly set as the 2FA3 sector operation type. Therefore, the data unit 22 is provided with two racks, one channel element of one rack is used as one FA traffic channel resource having three sectors α, β, and γ, and the channel element of another rack is used as another one. As FA traffic channel resources.

[0011] When the base station initialization is completed and the mobile station 10 makes a call request, the call request signal is transmitted to the control station 30 through the base station 20. This allows
When the base station resource allocation request is transmitted from the control station 30, the base station 30 sends the Access_
The FA is used as it is to check whether a Walsh code can be assigned. Here, Access_FA is
This means an FA maintained by a mobile station in a service state, and the mobile station requests traffic in this Access_FA band.

Such a walsh code is an air resource and has a common code group between the mobile station 10 and the base station 20, and is used at the time of receiving a signal and at the time of determining a transmission code on the receiving side. Is a kind of orthogonal code. Such wals
h code has 64 codes per FA.

[0013] Accordingly, the base station 20 establishes the Access_FA
Check whether there is a usable code in the walsh code DB corresponding to
A walshcode is assigned to the mobile station 10 (ST3).

Thereafter, the base station 20 checks whether the traffic channel is available. That is, a traffic channel database is searched in the base station resource database using the Access_FA for which the mobile station has made a call request as a key. As a result, it is checked whether there is a traffic channel element (Traffic Channel Element: TCE) that can be allocated among the channel elements in the rack of the corresponding FA. If there is a TCE that can be assigned as a result of the inspection, the TCE is assigned to the mobile station 10 (ST4). In this way, when a traffic path with the called subscriber is set up through the base station 20, the control station 20, and the exchange (not shown in FIG. 1), the mobile station 10 that has made the call is set to the traffic state. Become.

[0015]

As described above, the base station 2
In the resource management of the digital unit 22 of 0, since the base station resource database is constructed according to the initially set operation type and cannot be changed again, the operation must be fixedly performed according to the initially set operation type. Will be accompanied.

That is, when the traffic channel of the DU 22 is fixedly set as the 2FA 3 sector operation type at the time of initialization of the base station, the traffic channel resources of the DU 22 can be used only in the 2FA 3 sector mode and the 6FA OMNI type. There was a problem that it could not be used.

[0017] Therefore, there is a problem that when the operation is to be performed by changing the base station configuration, it is impossible with the conventional base station configuration operation method.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to make it possible to variably operate the traffic channel resources of the base station without restricting the operation type. By providing a method capable of variably operating the form, the operator can variably operate, maintain, and repair the base station system according to the service environment, and improve the system operation function. It is an object of the present invention to provide a method for dynamically operating a base station configuration that can contribute to optimization of a service area and improvement of traffic quality.

[0019]

In order to achieve the above object, a method for dynamically operating a base station configuration according to the present invention comprises:
Base Station Management System
m: From BSM to base station PLD (Program Loading Dat)
In response to the reception of a), a base station initialization step of configuring a base station resource database in a base station operation mode in accordance with an operator's command, and a base station resource allocation is requested by a mobile station call request. Access_FA for which the request was made, walsh cod
e (air resources) database (DB) access (Acces
s) an air resource conversion step of converting into a walsh code DB FA, and searching for a walsh code that can be allocated using the converted walsh code DB FA as a key, and wals that can be allocated.
an air resource allocating step of allocating a walsh code when there is an h code; a traffic channel converting step of converting the Access_FA into a DB_FA for accessing a traffic channel database;
Searching the traffic channel database using the FA as a key, and if there is a traffic channel element (TCE) that can be allocated, performing a traffic channel allocation step of allocating the TCE.

The step of initializing the base station comprises:
Reading the corresponding FA identifier for the device unit from D and converting the corresponding FA identifier to the corresponding DB_FA according to the base station operation type;
And configuring a base station resource database.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for dynamically operating a base station according to the present invention will be described in detail with reference to the accompanying drawings. According to the present invention, when a device unit of a base station system is operated in a multi-sector, one device unit is configured and operated by one FA traffic channel resource having three sectors α, β, and γ. In this way, when the multi FA OMNI type is to be operated, the three FAs are put together to share the traffic channel resources of one device unit. Thus, according to this method, one device unit of the base station system can be variably operated in 1FA3 sector or 3FA OMNI type according to an operator's command.

FIG. 5 is a flowchart illustrating a method of dynamically operating a base station configuration according to the present invention. As shown in FIG.
A base station initialization stage for constructing a base station resource database in a base station operation mode according to an operator's command (ST11-
ST13), when the base station resource allocation is requested by the call request of the mobile station 10, the Access_FA for which the call request was made is stored in w
an air resource conversion step (ST14, ST15) for converting to a walsh code DB FA for access to an alsh code database (DB);
An air resource allocating step (ST16) of allocating a walsh code by searching for a walsh code that can be allocated using the de DB FA as a key, and the Access_F
A: converting a traffic channel into a DB_FA for accessing the traffic channel database (ST17); searching the traffic channel database using the converted DB_FA as a key; as a result, assignable traffic channel elements ( Traffic Channel Element (TCE) and TC
A step (ST18) of allocating a traffic channel for allocating E is performed.

The base station initialization step (ST11-ST1)
3) reads the FA identifier for the corresponding device unit of the PLD transmitted through the control station 30, and stores the FA identifier according to the base station type according to the instruction of the operator.
A step of converting to a B_FA (ST11, ST12) and a step of constructing a base station resource database using the converted DB_FA (ST13) are performed.

The method of dynamically operating the base station configuration according to the present invention as described above will be described as follows.
First, the BSM 40 defines the FA-specific PLD values for initializing the base station resource database as shown in Table 1 so that the base station form can be variably operated. And
PLD values by sector and FA are defined as shown in Table 2.

[0025]

[Table 1]

[0026]

[Table 2]

FIG. 6 shows 2FA among the operation types of the base station.
P of traffic channel resource in case of 3 sectors
3 shows an LD configuration. As shown in FIG. 6, each channel element of the device unit is classified into a rack, a slot (slot: channel card), and a sub node (sub_node: channel element). The racks correspond to FAs, the first rack is responsible for one FA, and the second rack is
The rack takes charge of 2FA, and as shown in Table 1, the channel element of the first rack that takes charge of 1FA has an FA identifier value of 1, and the channel element that takes charge of 2FA has 2 FA identifiers. Become like

FIG. 7 shows 6FA among operation types of base stations.
5 shows a PLD configuration of a traffic channel resource in the case of OMNI. The first rack is 1FA-3FA OM
2nd rack is 4FA-6FA OMNI
To be in charge of As a result, as shown in Table 1, the FA identifier for the channel element of the first rack has a value of “1_3”, and the FA identifier for the channel element of the second rack has a value of “4_6”.

Here, only the PLD values of the traffic channel resources in the case of the 2FA 3 sector type and the case of the 6FA OMNI type have been described as an example.
In the case of A3 sector, 3FA3 sector, etc., a PLD having the value of the FA identifier can be configured based on the definition in Table 1.

Accordingly, the base station resource PLD is configured so that the traffic channel resources can be shared even when the base station is operated in many forms.

Thereafter, when the base station 20 is powered on, the BSM 40 to the BSC3 to initialize the base station.
0 is transmitted to the BS 20 via the PCD. At this time, the transmission includes base station operation type information according to an operator's command.

Next, the base station 20 reads the FA identifier for the corresponding device unit of the transmitted PLD (ST1).
1). Then, the base station operation mode information is confirmed, and a database for base station resource maintenance and management is constructed according to the base station operation mode (ST12, ST13).

Before configuring the base station resource database,
You should generate a key that will allow you to access the database. The traffic resource database access key for managing each channel element of the device unit provided in the base station is converted and generated based on the base station operation mode information transmitted through the base station management system 40 (ST12).

FIG. 8 shows a DB_FA conversion method which is a key for accessing a traffic resource database in each base station operation mode. If the base station operation mode information transmitted from the base station management system 40 is 2FA3 sector type, the DB_FA for 1FA is set to "1" without discrimination between sectors and the DB_FA for 2FA identifier justice name.
_FA is converted to “2” without discrimination between sectors.

The base station operation mode information is 3FAO.
If MNI, DB_FA is "1" without distinguishing FA
In the case of 6FA OMNI, DB_FA is converted to “2” without distinguishing FA.

Accordingly, the channel element in each rack of the device unit has a DB_FA value of “1” for the first rack regardless of the base station operation mode,
The second rack has a DB_FA value of “2”.

After the traffic resource database access key is generated, a traffic resource database is generated based on the base station operation mode information (ST13). Accordingly, when the base station operation mode is 6FA OMNI in FIG. 7, a traffic resource database as shown in FIG. 9 is configured.

[0038] Since the same method is used for other base station operation modes, only the traffic resource database is shown in the case of 6FA OMNI, and the illustration and description of the database are omitted in other cases.

On the other hand, in the case of air resources, 64 walsh codes are provided per FA, so that the base station needs
Configure the walsh code database.

After the base station is initialized by the above-described method, when a call request is issued from the mobile station 10, the call request signal is transmitted to the control station 30 through the base station 20. Next, the control station 30 forms a path for call connection with the exchange, and requests the base station 20 to allocate resources (S14).

As a result, the base station 20 starts allocating the FA, and checks whether the Walsh code, which is an air resource, can be allocated. walsh code D to access the walsh code database to access the walsh code database
B_FA should be generated, and this method is shown in Table 3.

That is, the Walsh code DB_FA which is the key value of the Walsh code database is generated to the same value as the Access_FA (ST15).

As a result, in the walsh code DB_FA
wals that can be used by accessing the walsh code database
Check for h code. As a result, available wals
If there is an h code, a walsh code is assigned (ST16).
However, if there is no available walsh code, the call request from the mobile station will fail.

[0044]

[Table 3]

When the walsh code is assigned, the base station generates a traffic channel database access DB_FA to check whether the traffic channel can be assigned (S17). This generation method is shown in Table 4.

[0046]

[Table 4]

That is, when the base station operation mode is 6FA OMN
If it is I, Access_FA is “1”, “2”, “3”
, DB_FA is converted to “1” and Access_F
When A is “4”, “5”, “6”, DB_FA is converted to “2”.

Here, the mobile station 10 makes a call request.
If Access_FA is “4”, DB_FA is converted to “2”. Then, the database for the channel elements of the second rack is accessed to search for available channel elements.

As a result, if there is a channel element that is not in traffic among the channel elements in the normal state, that is, as shown in FIG. 9, the channel element whose traffic channel identifier of the second rack is 1 is assigned to the mobile station 10. (ST18). Thereafter, the "in-traffic" information is stored to manage the usage state of the channel element. However, if no channel element is available, the mobile station's call request will fail.

When the base station 20 is operated in the 6FA OMNI type and the operation is changed to the 2FA3 sector type in the course of operation, the operator transmits the base station operation mode information through the base station management system 40 to the 2FA3 type.
Command as sector type. Thereby, the base station 20
Configures a base station resource database with the 2FA3 sector operation type information.

Also in this case, the database is configured so that the first rack channel element of the device unit is used for 1FA and the second rack channel element is used for 2FA. Accordingly, the database of the traffic channel resources provided in the base station can be reconfigured and shared regardless of the type of the base station. As a result, the base station 20 can be operated in the 2FA sector.

That is, the present invention enables the base station system to be variably operated, maintained, and repaired according to the service environment by sharing the traffic resources of the base station.

On the other hand, the overhead channel is defined as a pilot channel / access (Acc).
Since the overhead channel should continuously perform the function of maintaining the service of the CDMA system in terms of the ess) channel / paging channel, the base station system should have the function of this overhead channel. is there.

In the base station system, DB_FA is used as a key to maintain a database of traffic channel resources.
Overhead channel duplication also performs its function using DB_FA as a key.

The corresponding F performed by the overhead channel
A, When the sector overhead becomes abnormal,
The base station system searches for traffic channel resources on the corresponding device unit using the resource DB_FA of the used traffic channel as a key, and then selects an assignable traffic channel to substitute for an overhead channel.

A traffic channel for multiplexing the overhead channel is determined, and the determined channel type of the corresponding channel, FA identifier to be serviced, and sector information are stored in the base station resource database and the PLD.
Reflect on top.

When a plurality of device units are installed in the base station system, the base station can be expanded to a multi FA multi sector.

[0058]

As described above, the method of dynamically operating the base station configuration according to the present invention uses the channel element per rack unit of the device unit provided in the base station system in the case of the three sector partition type. Is one FA
Is used, and in the case of the OMNI type, three F
By using A, the traffic channel resources of the base station can be variably operated without restriction of the operation type, and the operator can easily and variably operate the base station system according to the service environment. Has the advantage that it can be operated, maintained and repaired.

With the above advantages, the operability of the base station system can be improved, the service area can be optimized, and the traffic quality of the user can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a general CDMA mobile communication system.

FIG. 2 is a mounting diagram of a channel card of a device unit provided in the base station system of FIG. 1;

FIG. 3 is a diagram illustrating the number of mounted channel elements per channel card of FIG. 2;

FIG. 4 is a flowchart illustrating a general base station configuration operation method.

FIG. 5 is a flowchart illustrating a method of dynamically operating a base station configuration according to the present invention.

FIG. 6 is a diagram illustrating a PLD configuration of a traffic channel resource in a case of a 2FA3 sector among operation types of a base station.

FIG. 7: 6FA OMNI among operation types of base stations
5 is a diagram illustrating a PLD configuration of a traffic channel resource in the case of FIG.

FIG. 8: FA for a corresponding device unit of PLD
Identifier to DB_FA for access to base station resource database
6 is a diagram illustrating a method of converting to.

FIG. 9 is a diagram illustrating a traffic resource database configured using a PLD of a traffic channel resource in the case of 6FA OMNI.

[Explanation of symbols]

Reference Signs List 10 mobile station, 20 base station, 21 high frequency processing unit, 22 digital unit, 23 base station control processor, 30 control station.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kim Eong-bir 699-7 Famiri, Fangba-eup, Icheon-si, Gyeonggi-do, Republic of Korea

Claims (6)

[Claims] In a CDMA mobile communication system including a mobile station, a base station, a control station, a base station management unit, and a mobile communication switch, a step of determining an operation type of the device unit in the base station; If the device unit is to be operated in a multi-sector (multi-sector), the device unit is replaced with one FA having three sectors α, β, and γ.
(Frequency Assignment) to be configured and operated with traffic channel resources, and, as a result of the determination, the device unit
When operating in the OMNI type, three F
A). A method of dynamically operating a base station configuration, comprising: combining A and configuring a device unit to share a traffic channel resource. 2. Code division multiple access (Code Division Multiple Access)
A method for dynamically operating a base station configuration of an iple Access (CDMA) mobile communication system, comprising: a base station management system (Base Station Management System);
m: From BSM to base station PLD (Program Loading Dat)
In response to the reception of step a), the base station is initialized in the base station resource database according to the base station operation mode in accordance with the operator's command, and the base station resource allocation is requested by the mobile station call request. The requested Access_FA is stored in a walsh code (air resource) database (DB) for access (Access).
an air resource conversion step of converting the walsh code DB FA into a walsh code DB FA; A traffic channel conversion step of converting the Access_FA into a DB_FA for accessing a traffic channel database; and searching the traffic channel database using the converted DB_FA as a key, and as a result, assignable traffic channel elements (TrafficChannel E).
lement: performing a traffic channel allocation step of allocating a TCE when there is a TCE. 3. The FA-based PLD value for initializing the base station resource database is 1 for 1FA, 2 for 2FA, and 3 for 3FA.
FA is 3, 4FA is 4, 5FA is 5, 6FA is 6
1FA-3FA is 254, 4FA-6F
The method of claim 2, wherein A is defined as 253. 4. When the base station operation mode is one FA3 sector, the PLD value by the FA and the sector is defined as 1, 2, and 3 and the FA identifier is defined as 1. Is a 2FA3 sector, the sector value is defined as 1, 2, 3; the FA identifier is defined as 1, 2; if the base station operation mode is 3FA OMNI, the sector value is defined as 1, The identifier is 1_3 (25
4) and the base station operation mode is 6FA OMN
If I, the sector value is defined as 1 and the FA identifier is 1
_3 (254), and 4_6 (253), respectively. 5. The base station initializing step j includes a step of: transmitting a corresponding F from the base station PLD to a device unit.
3. The method according to claim 2, further comprising: reading an A identifier, converting the FA identifier into a corresponding DB_FA according to the base station operation type, and configuring a base station resource database using the converted DB_FA. A method for dynamically operating the described base station configuration. 6. A method for converting a DB_FA which is a key for accessing a traffic resource database according to each base station operation mode, wherein the base station operation mode information is 2F.
DB_F for 1FA if A3 sector type
A is converted to “1” without sector distinction, and DB_FA for 2FA identifier definition name is converted to “2” without sector distinction,
When the base station operation mode information is 3FA OMNI,
DB_FA is "1" without distinguishing FA, 6FA OMNI
3. The method according to claim 2, wherein DB_FA is converted to "2" without distinguishing FA.