KR100342683B1 - Method for operating configuration of base station dynamically - Google Patents

Abstract

SUMMARY OF THE INVENTION The present invention provides a method for varying the shape of a base station of a code division multiple access (CDMA) mobile communication system. The present invention receives a base station PLD (Program Loading Data) from a base station management system (BSM). In response, the base station resource database is configured according to the base station operating shape by the operator's command to initialize the base station. Then, if the base station resource allocation is required by the mobile station's call attempt, the allocated frequency Access_FA is converted into a Walsh code DB FA and then the code Walsh code DB FA is converted into a key ( key to find an assignable Walsh code and assign it if there is one. After converting the allocated frequency Access_FA into a code DB_FA for accessing the call channel database, the code DB_FA is used as a key to search the call channel database and consequently assigns a call channel element ( TCE is allocated if there is a Traffic Channel Element (TCE). Thus, by sharing the channel elements of each rack of the device unit regardless of the base station shape, the base station system can be flexibly operated, maintained, and repaired according to the service environment, thereby improving the flexibility of the base station system. In addition, the service area can be optimized and the call quality of the user can be improved.

Description

Method for operating configuration of base station dynamically

The present invention relates to a Code Division Multiple Access (CDMA) mobile communication system. In particular, the present invention provides a method for variably operating the base station shape, thereby allowing the operator to operate and maintain the base station system variably according to the service environment. The present invention relates to a base station variable operation method capable of performing maintenance, etc., and improving a system operation function.

1 shows a block configuration of a general CDMA mobile communication system.

The mobile station (MS) 10 requests mobile communication service to the base station according to the subscriber's request while moving, and the base transceiver station (BTS) 20 performs an air interface with the MS 10. A base station controller (BSC) 30 processes a call processing request from the base station (BTS) 20 and controls the base station 20. The base station management system (BSM) 40 performs a function of controlling the control station 30 according to an operator's command.

The base station 20 includes: a radio frequency unit (RFU) 21 for processing a radio frequency (RF) for an air interface with the MS 10; CDMA channel demodulation and error correction of each channel signal from the RFU 21 is transmitted to the control station 30, and the digital packet processing of the encoded packet data transmitted from the control station 30 for each CDMA channel is performed. A digital unit (DU) 22 which is then transmitted to the RFU 21; A base station control processor (BCP) 23 which performs overall control of base station operation; And a base station interconnection network (BIN) 24 which performs the function of connecting the DU 22 and the BCP 23 to the control station 30.

FIG. 2 shows the internal block structure of the DU 22 of FIG. One rack includes four channel cards for CDMA channel demodulation of signals per channel, and other devices such as a power supply unit. As shown in FIG. 3, each channel card has a maximum of 18 channel elements.

In the general CMDA mobile communication system as described above, the service area is divided into a plurality of cells so that the capacity of the subscriber can be greatly increased by using a frequency reuse method within a range that does not affect the service of neighbor cells in each cell. It provides a mobile communication service. Each cell is divided into three sectors, α, β, and γ, thereby increasing the capacity while improving the quality of service. In addition, a frequency allocated to one cell (base station) for service is called a frequency allocation (FA). When a large amount of service is unable to cover a single FA, a plurality of FAs are allocated to the base station. To assign it to operate. Therefore, each base station has a different operation type according to the amount and characteristics of the service.

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

As shown, a base station initialization step (ST1) for initializing the base station by initializing the base station resource database by fixing to the initially set shape; When the base station resource allocation is requested by the mobile station 10, the air resource allocation step (ST2, ST3) is used to check whether the walsh code can be allocated by using the attempted Access_FA as it is, and if so, assigns the walsh code. )Wow; The access_FA is searched for the base station resource database to check whether there is an assignable traffic channel element (TCE), and as a result, a TCE allocation step (ST4) of allocating a TCE is performed.

The general base station configuration operating method as described above is as follows.

When one base station is to be operated in a 2FA 3 sector shape, the operator generates a 2FA 3 sector base station PLD (Program Loading Data) through the BSM 40, and when the base station is powered on, the base station PLD is controlled. It is transmitted to the base station 20 through the station 30.

Then, the base station 20 performs initialization by the PLD received through the control station 30. The base station resource database is initialized using the corresponding FA identifier of the PLD as it is (ST1). Thus, the device unit 22 of the base station 20 is fixedly set to the 2FA three sector operating shape. Accordingly, the data unit 22 includes two racks so that channel elements of one rack are used as call channel resources of one FA having three sectors of alpha, beta, and gamma, and channel elements of the other rack are used. Use it as a FA call channel resource.

In this way, when the base station initialization is completed and the mobile station 10 makes a call attempt, the call request signal is transmitted to the control station 30 through the base station 20. Thus, when the base station resource allocation request is transmitted from the control station 30, the base station 30 checks whether the Walsh code is assigned using the frequency Access_FA allocated to the mobile station 10 as it is. Here, the frequency (Access_FA) assigned to the mobile station means an FA maintained by the mobile station in the service state, and the mobile station requests a call in this allocated frequency (Access_FA) band.

This Walsh code is an air resource, which is a kind of orthogonal code that prepares a common code group between the mobile station 10 and the base station 20 and is used when determining the transmission code at the time of receiving a signal at the receiving side. This Walsh code has 64 codes per FA.

Thus, the base station 20 checks whether there is a usable code in the Walsh code DB corresponding to the frequency Access_FA assigned to the mobile station, and if there is a Walsh code available, the base station 20 transmits the Walsh code. (10) (ST3).

The base station 20 then checks whether the call channel is available. That is, the mobile station searches for the call channel database in the base station resource database using the assigned frequency Access_FA as a key. Therefore, it is checked whether there is an assignable traffic channel element (TCE) among the channel elements in the rack of the corresponding FA. If there is a TCE that can be allocated as a result of the inspection, the TCE is allocated to the mobile station 10 (ST4). In this way, when a call path is established with the called subscriber through the mobile station 10, the base station 20, the control station 30, and the switching station (not shown in Fig. 1) that attempted to make the call, the call state is established.

In this way, the resource management of the data unit 22 of the base station 20 has a constraint that the base station resource database must be fixed according to the initial set operation shape since the base station resource database is constructed and cannot be changed again. That is, if the call channel of the DU 22 is fixedly set to the 2FA 3-sector operation shape when the base station is initialized, the call channel resources of the DU 22 may be used only in the 2FA 3-sector shape and may be used as the 6FA OMNI shape. There was no problem. Therefore, when it is necessary to operate by changing the base station shape, there is a problem that it is impossible by the conventional base station shape operating method.

Therefore, the present invention has been proposed to solve the conventional problems as described above, the object of the present invention is

By providing a method to operate the base station variably by allowing the call channel resource of the base station to be operated variably without the operation shape, the operator can operate, maintain, and repair the base station system variably according to the service environment. The present invention provides a base station variable operating method that can contribute to the improvement of the system operation function, the optimization of the service area and the improvement of the call quality.

In order to achieve the above object, the base station variable operating method according to the present invention,

A base station initialization step of receiving a base station program loading data (PLD) from a base station management system (BSM) and configuring a base station resource database according to a base station operation shape by an operator's command;

If the base station resource allocation is required by the mobile station's call attempt, the air resource conversion step of converting the attempted assigned frequency (Access_FA) into a code for accessing the Walsh code database (walsh code DB FA); ;

An air resource allocation step of finding an assignable Walsh code using the converted code (walsh code DB FA) as a key and allocating an assignable Walsh code if any;

A call channel conversion step of converting the allocated frequency Access_FA into a code DB_FA for accessing a call channel database;

The call channel assignment step of searching the call channel database using the converted code DB_FA as a key and assigning TCE if there is an assignable call channel element (TCE) is performed. It is characterized by the configuration.

The base station initializing step includes: reading a corresponding FA identifier for a device unit from the base station PLD, and converting the FA identifier into a corresponding code (DB_FA) according to the base station operation type; And constructing a base station resource database with the converted code DB_FA.

1 is a block diagram of a general CDMA mobile communication system;

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

3 is a view showing the number of channel element mountings per channel card of FIG.

4 is a flowchart illustrating a general base station configuration operation method;

5 is a flowchart illustrating a method for operating a variable base station shape according to the present invention;

6 is a diagram illustrating a PLD configuration of a call channel resource in the case of 2FA 3 sectors of an operation configuration of a base station;

FIG. 7 is a diagram illustrating a PLD configuration of a call channel resource in the case of 6FA OMNI among operating shapes of a base station; FIG.

8 is a view showing a method of converting an FA identifier for a corresponding device unit of a PLD into a base station resource database access code DB_FA;

Fig. 9 shows a call resource database constructed using a call resource PLD in the case of 6FA OMNI. Explanation of codes for the main parts of the drawing 10 ..... Mobile station 20 ..... Base station 30 ..... Control station

Hereinafter, 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 to be operated in a multi-sector, one device unit is configured and operated by one FA channel channel resource having three sectors of alpha, vector, and gamma. If you want to operate in multi-FA OMNI configuration, three FAs are bundled to share the call channel resource of one device unit. Thus, in this manner, one device unit of the base station system can be variably operated by the operator's command even in 1FA 3 sectors or 3FA OMNI configuration.

5 is a flowchart illustrating a base station variable operating method according to the present invention.

As shown, the base station initialization step (ST11-ST13) for establishing a base station resource database in accordance with the base station operation shape by the operator's command; When the base station resource allocation is required in the call attempt of the mobile station 10, the air resource conversion step of converting the attempted allocated frequency Access_FA into a code for accessing the Walsh code database DB (walsh code DB FA) ( ST14, ST15); An air resource allocation step (ST16) for finding an assignable Walsh code using the converted code (walsh code DB FA) as a key and allocating a Walsh code if available; A call channel conversion step (ST17) of converting the allocated frequency into a code DB_FA for accessing a call channel database; Searching the call channel database using the converted code DB_FA as a key and performing a call channel assignment step (ST18) of allocating a TCE if there is an assignable call channel element (TCE). do.

In the base station initialization step (ST11-ST13), the FA identifier for the corresponding device unit of the PLD received through the control station 30, and read the FA identifier according to the base station operation type by the operator's command corresponding code (DB_FA Step (ST11, ST12); In step ST13, a base station resource database is constructed using the converted DB_FA.

Referring to the base station variable operating method according to the present invention as described above are as follows.

First, in order to variably operate the shape of the base station, the BSM 40 defines the value of the FA-specific PLD for initializing the base station resource database as shown in [Table 1]. The PLD values according to sectors and FAs are defined as shown in [Table 2].

FA Definition Name on the PLD Definition value on the PLD 1FA One One 2FA 2 2 3FA 3 3 4FA 4 4 5FA 5 5 6FA 6 6 1 to 3 FA 1_3 254 4 ~ 6FA 4_6 253

Operating shape Sector value FA identifier 1FA 3 sector operation 1,2,3 One 2FA 3 sector operation 1,2,3 1,2 3FA OMNI operation One 1_3 (254) 6FA OMNI operation One 1_3 (254), 4_6 (253)

FIG. 6 shows a PLD configuration of call channel resources in the case of 2FA 3 sectors of the operation configuration of the base station. As shown, each channel element of the device unit is divided into a rack, a slot (channel card), and a subnode (channel element). And corresponding to the FA in a rack unit, the first rack is responsible for 1FA, the second rack is responsible for 2FA, as shown in Table 1, the channel element of the first rack to be responsible for 1FA A channel element having a FA identifier value of 1 and responsible for 2FA has a FA identifier value of 2.

FIG. 7 illustrates a PLD configuration of call channel resources in the case of 6FA OMNI in the operational configuration of the base station. The first rack is in charge of 1FA-3FA OMNI, and the second rack is in charge of 4FA-6FA OMNI. Thus, as shown in [Table 1], the FA identifier for the channel element of the first rack has a value of '1_3', the FA identifier for the channel element of the second rack has a value of '4_6'.

Here, only the PLD value of the call channel resource in the case of the 2FA 3 sector type and the 6FA OMNI type is shown as an example, but in the case of 1FA 3 sector, 3FA 3 sector, etc., the FA identifier value is defined according to the definition of [Table 1]. The PLD is constructed.

Thus, even when the base station is operated in a plurality of shapes, the base station resource PLD is configured so that the call channel resources can be shared.

Then, when the base station 20 is powered on, a PLD is transmitted from the BSM 40 to the BS 20 through the BSC 30 to initialize the base station. At this time, the base station operation shape type information by the operator's command is included and transmitted.

The base station 20 reads the FA identifier for the corresponding device unit of the received PLD (ST11).

Then, the base station operating configuration type information is checked to configure a database for base station resource maintenance according to the base station operating configuration type (ST12, ST13).

Before configuring the base station resource database, a key must be generated to allow access to the database. The key for accessing the call resource database for managing each channel element of the device unit provided in the base station is converted and generated according to the base station operating configuration type information received through the base station management system 40 (ST12).

A code DB_FA conversion method, which is a key for accessing a call resource database according to each base station operating configuration type, is shown in FIG.

If the base station management shape type information received from the base station management system 40 is 2FA 3 sector shape, the DB_FA for 1FA is 1 without sector discrimination, and the code (DB_FA) for 2FA identifier definition name is 2 without sector discrimination. Convert to If the base station operating configuration type information is 3FA OMNI, the code DB_FA is converted to 1 without distinguishing FA, and if 6FA OMNI is converted to 2 without distinguishing FA.

Thus, the channel element in each rack of the device unit has a code value DB_FA of 1 for the first rack and 2 for the second rack, regardless of the base station operating shape type.

After the call resource database access key is generated in this manner, the call resource database is generated according to the base station operation shape type information (ST13).

Thus, when the base station operating configuration type is 6FA OMNI of Fig. 7, a call resource database as shown in Fig. 9 is constructed. Since it is configured in the same manner for the other base station operation shape types, only the call resource database is shown in the case of 6FA OMNI and the illustration and description of the database are omitted here.

Meanwhile, in the case of air resources, since 64 Walsh codes are provided per FA, the base station configures a Walsh code database for each FA.

After the base station is initialized in the above manner, if a call attempt is requested from the mobile station 10, this call request signal is transmitted to the control station 30 via the base station 20. The control station 30 forms a path for call connection with the switching center, and requests the base station 20 to allocate resources (ST14).

Thus, the base station 20 allocates the FA and checks whether the Walsh code, which is an air resource, is assigned. To access the Walsh code database, we need to generate a code for accessing the Walsh code database (walsh code DB_FA), which is shown in Table 3.

That is, the code Walsh code DB_FA, which is a Walsh code database key value, is generated at the same value as the allocated frequency Access_FA (ST15).

So the code (walsh code DB_FA) accesses the Walsh code database and checks for available Walsh code. As a result, if there are available Walsh codes, they are allocated (ST16). However, if no Walsh code is available, the mobile's call attempt will fail.

Base station geometry Access_FA Key value of FA on walsh code database 1FA 3 sectors One One 2FA 3 sectors One One 2 2 3FA OMNI One One 2 2 3 3 6FA OMNI One One 2 2 3 3 4 4 5 5 6 6

If the Walsh code has been assigned, the base station generates a call channel database access code DB_FA to check whether the call channel is allocated (ST17). This generation method is shown in [Table 4].

Base station geometry Access_FA DB_FA 1FA 3 sectors One One 2FA 3 sectors One One 2 2 3FA OMNI One One 2 One 3 One 6FA OMNI One One 2 One 3 One 4 2 5 2 6 2

That is, when the base station operating configuration is 6FA OMNI, the assigned frequency (Access_FA) is 1, 2, 3, the code (DB_FA) is converted to 1, the assigned frequency (Access_FA) is 4, 5, 6 is the code (DB_FA ) Is converted to two. Thus, if the code DB_FA is 1, as shown in Fig. 9, the database for the channel element of the first rack of the device unit can be accessed, and if the code DB_FA is 2, the second rack of the device unit is You can access the database for channel elements.

Here, if the allocated frequency Access_FA that the mobile station 10 attempts to call is 4, the code DB_FA is converted to 2. The database is then accessed for the channel elements of the second rack to search for available channel elements. As a result, if there is a channel element that is not in a call among the channel elements in the normal state, that is, as shown in FIG. 9, the channel element having the traffic channel identifier of the second rack is 1 is allocated to the mobile station 10 (ST18). It then stores the busy information to manage the usage of the channel element.

However, if no channel element is available, the call attempt of the mobile station fails.

When the base station 20 operates in the 6FA OMNI shape as described above, and changes to the 2FA 3 sector shape, the operator commands the base station management shape type information to the 2FA 3 sector shape through the base station management system 40. The base station 20 then constructs a base station resource database with this 2FA three sector operational shape information. Even in this case, the database is configured such that the first rack channel element of the device unit is used for 1FA and the second rack channel element is used for 2FA. Therefore, the call channel resources provided in the base station can be reconfigured and shared regardless of the base station shape. As a result, the base station 20 can operate in 2FA 3 sectors. Therefore, in the past, when the base station operating configuration information was initially set, it was not possible to change to other operating configuration information, and according to the present invention, the base station system was variably managed, maintained, and repaired according to the service environment. It becomes possible.

The overhead channel refers to a pilot channel, an access channel, and a paging channel. The overhead channel is a base station because the overhead channel must continuously perform functions to maintain the service of the CDMA system. The system must have the redundancy of this overhead channel.

In the base station system, since the database maintenance of the call channel resource uses the code DB_FA as the key, the function is performed using the overhead channel redundancy code DB_FA as the key.

When the overhead of the corresponding FA and sector performed by the overhead channel becomes abnormal, the base station system searches for the call channel resource on the corresponding device unit using the code (DB_FA) as the key of the available call channel resource. Then, select an assignable call channel and replace it with an overhead channel.

The call channel for duplication of the overhead channel is determined, and the determined duplicated channel type of the corresponding channel, the FA identifier and the service information of the determined channel are reflected on the base station resource database and the PLD.

If a plurality of devices are installed in the base station system, the base station can be expanded to have a shape of a multi FA multi sector.

As described above, in the base station variable operating method according to the present invention, a channel element per rack unit of a device unit provided in the base station system is used by one FA in the case of a 3-sector division shape, and the OMNI shape In this case, three FAs can be used to allow the base station's call channel resources to be operated variably without constraints on the operation configuration, allowing the operator to variably operate, maintain, and maintain the base station system according to the service environment. . Therefore, the operational flexibility of the base station system can be improved, the service area can be optimized, and the call quality of the user can be improved.

Claims (3)

A method of operating a base station configuration of a code division multiple access (CDMA) mobile communication system, A base station initialization step of receiving a base station PLD (Program Loading Data) from a base station management system (BSM) and configuring a base station resource database according to a base station operation shape according to an operator's command; An air resource conversion step of converting the allocated frequency Access_FA into a code for accessing the Walsh code database DB when the base station resource allocation is required by the mobile station's call attempt; An air resource allocation step of finding an assignable Walsh code using the converted code (walsh code DB FA) as a key and allocating an assignable Walsh code if any; A call channel conversion step of converting the allocated frequency Access_FA into a code DB_FA for accessing a call channel database; Search for a call channel database using the converted code DB_FA as a key, and if there is an assignable call channel element (TCE), performing a call channel assignment step of allocating a TCE; Base station shape variable operation method. The method of claim 1, wherein the base station initialization step, Reading the corresponding FA identifier for the device unit from the base station PLD and converting the FA identifier into a corresponding code (DB_FA) according to the base station operation type; And forming a base station resource database using the converted code DB_FA. The method of claim 1, wherein the base station PLD, Base station shape variable, which includes FA identifier values for all base station operating shapes, sectors divided into different FA identifier values per FA, and OMNI shapes have different FA identifier values per 3 FAs Operating method.