KR20040061055A - The cell setup method in w-cdma system - Google Patents

Abstract

PURPOSE: A base station cell setup method in a W-CDMA system is provided to prevent degradation of signal quality and reduction of radio resource capacity by preventing a radio output of a common channel. CONSTITUTION: A radio network controller transmits a cell setup request message to a base station protocol(410). An RCCA(Radio and Channel Control Assembly) sets a base channel card(420). The RCCA locks a radio output so as not to be outputted(430). A CTCH(Common Transport Channel) setup process for setting up an S-CCPCH(Secondary-Common Control Physical Channel) and a PRACH(Primary Random Access Channel)(440). After an SIB(System Information Block) is updated, the RCCA unlocks the radio output(450) and a call is generally processed or communication is performed between radio networks(460).

Description

Base station cell setup method in W-CDMA system {THE CELL SETUP METHOD IN W-CDMA SYSTEM}

The present invention relates to a cell setup of a base station (Node-B) of the W-CDMA system, and in particular, to improve radio environment to prevent interference by neighboring cells, etc., which may occur during a setup period by improving a cell setup procedure. To a base station cell setup for a.

In general, cell setup of a base station in a W-CDMA system is a task for establishing a common radio section required for call processing and communication between a core network (CN), a wireless network (ie, a wireless network control station and a base station), and a terminal. The common radio channel created through the cell setup has a function similar to that of the existing synchronous (IS-95 CDMA) overhead channel.

Next, a hardware configuration of a W-CDMA mobile communication system will be described with reference to FIG. 1.

The W-CDMA mobile communication system is composed of a core network 100, a radio network control station 120, a plurality of base stations 140, and a terminal 160. The core network 100 is connected to the radio network control station 120 via an Iu interface. The core network 100 includes a circuit switched network (not shown), which is an area for processing voice call-based bearer connection and signal, and a packet switched network (not shown), which is an area for processing packet call-based bearer connection and signal.

The radio network control station 120 supports soft handover and radio resource management algorithms, and uses the same interface for the circuit switched and packet switched domain connections of the core network 100 and the circuit switched and packet switched to the air interface protocol stack. Perform data processing functions. The radio network control station 120 is connected to a plurality of base stations 140 via an Iub interface.

The base station 140 is composed of a plurality of cells, and performs an L1 processing function which is an air interface such as channel coding, interleaving, speed matching, spreading, and the like. The base station 140 is connected to the terminal 160 via the Uu interface. The terminal 160 has subscriber identification, authentication algorithm execution, authentication and password storage, and subscriber information.

Next, a cell setup procedure of a base station of a conventional W-CDMA system will be described with reference to FIG. 2.

The 3rd Generation Partnership Project (3GPP) specification. As defined in TS 25.433, the cell setup process of the base station 140 includes three phases: a cell setup request step, a common transport channel (CTCH) setup step, and a system information block (SIB) update. Was done.

First, the cell setup request step will be described. The upper system, such as the radio network control station 120, transmits a cell setup request message, which is a Node-B Application Protocol (NBAP protocol), to the base station 140. The message includes channel modem setting information about a common pilot channel (CPICH), a synchronization channel (SCH), and a primary common control physical channel (P-CCPCH), which are common physical channels. have.

The base station 140 reports the radio network controller 120 after setting the channel modem through the cell setup message information. When the first step cell setup process ends, the set common physical channel starts to be transmitted to the W-CDMA radio environment.

Next, a common transport channel setup step is performed. That is, a setup for a secondary common control physical channel (S-CCPCH; Secondary CCPCH) and a physical random access channel (PRACH), which are common transport channels required for communication between the base station 140 and the wireless network control station 120 A task, the CTCH setup step, is performed.

Here, the sub common control physical channel is a physical channel for a paging channel (PCH) and a forward access channel (FACH), and the physical random access channel is for a random access channel (RACH) that is a reverse channel. Physical channel.

Finally, the system information block update step is performed. The SIB is system information always transmitted from the base station 140 to the terminal 160 (details 3GPP TS 25.331), and the SIB information updated by the upper radio network control station 120 is a broadcast channel (BCH). ) Data information.

The base station 140 loads the SIB on the P-CCPCH set in the first step, transmits the SIB, and performs radio calibration. The terminal 160 may communicate with the radio network control station 120 and the base station 140 after receiving the information.

However, the cell setup of the base station of the conventional W-CDMA system having the above configuration and operation process poses the following problems.

According to the prior art, the physical channels (ie, CPICH, SCH, and P-CCPCH) that are set and wirelessly output in the first stage do not transmit any information until the third stage SIB update is performed. Is output on the W-CDMA common channel. In other words, even if the terminal 160 acquires slot / frame synchronization and major scrambling codes through cell search (ie, CPICH and SCH), no data is carried through the P-CCPCH until the SIB update.

Radio transmission propagation for these common physical channels (CPICH, SCH, and P-CCPCH) acts as cell interference to other cells in the W-CDMA radio environment, thereby reducing signal quality degradation and traffic capacity of adjacent cells. Problem occurs.

The purpose of the base station cell setup method in the W-CDMA system of the present invention for solving the problems of the prior art as described above, the signal quality degradation and radio resource capacity by preventing the radio output of the common channel in the base station cell setup process of the W-CDMA system It is to provide a base station cell setup method that can prevent the reduction of city.

1 is a hardware configuration diagram of a W-CDMA mobile communication system.

2 is a diagram illustrating a cell setup procedure of a base station of a W-CDMA system.

3 is a detailed diagram for a cell set-up process within a wireless network control station and a base station according to the present invention.

4 is a flowchart of a base station cell setup process for improving radio environment according to the present invention;

<Description of the symbols for the main parts of the drawings>

100: core network 120: wireless network control station

140: base station 160: terminal

A base station cell setup method in a W-CDMA system according to the present invention for achieving the above object, in the base station cell setup process, the step of setting the channel card to the cell setup message of the wireless network control station, and the set And setting a lock on the wireless output of the channel, and releasing the set lock.

In addition, according to the present invention, the step of setting the lock, the combination of the path input to the base station sector conversion and up / down conversion assembly (BUDA) in the channel of the corresponding sector in the radio and channel control assembly (RCCA) of the base station It is characterized by setting a lock on you.

According to the present invention, the setting of the lock may include setting a lock on an input digital element in a base station sector conversion and up / down conversion assembly for a corresponding frequency and a corresponding sector to be cell set up.

In addition, according to the present invention, the step of releasing the lock is characterized in that it is executed when there is a request for updating channel information from the wireless network control station.

The following will be described in detail with reference to the accompanying drawings, a preferred embodiment of the base station cell setup method in the present invention W-CDMA system.

3 is a detailed diagram for a cell setup process within a wireless network control station and a base station according to the present invention. First, the cell setup request step will be described. The upper system, such as the radio network control station 120, transmits a cell setup request message, which is an NBAP protocol, to the base station 140. The message includes channel modem setting information for a common pilot channel (CPICH), a synchronization channel (SCH), and a common common control physical channel (P-CCPCH), which are common physical channels.

The base station 140 reports the radio network controller 120 after setting the channel modem through the cell setup message information. When the first step cell setup process ends, the set common physical channel starts to be transmitted to the W-CDMA radio environment.

Next, a common transport channel setup step is performed. That is, the CTCH setup step, which is a setup operation for the sub-common control physical channel (S-CCPCH) and the physical random access channel (PRACH), which are common transport channels required for communication between the base station 140 and the radio network control station 120, is performed. do.

Here, the sub common control physical channel is a physical channel for a paging channel (PCH) and a forward access channel (FACH), and the physical random access channel is a physical channel for a random access channel (RACH) which is a reverse channel.

Finally, the system information block update step is performed. The SIB is system information always transmitted from the base station 140 to the terminal 160 (details 3GPPTS 25.331), and the SIB information updated by the upper radio network control station 120 is data information of a broadcast channel (BCH). Becomes

The base station 140 loads the SIB on the P-CCPCH set in the first step, transmits the SIB, and performs radio calibration. The terminal 160 may communicate with the radio network control station 120 and the base station 140 after receiving the information.

The following describes the operation process by the base station cell setup method in the W-CDMA system of the present invention having the configuration as described above.

4 is a flowchart illustrating a base station cell setup process for improving radio environment according to the present invention.

First, when performing base station cell setup, the wireless network control station 120 transmits a cell setup request message, which is an initial NBAP protocol, to the base station protocol (step 410). The base station protocol transmits transmit power, frequency, and downlink scrambling code to a radio and channel control assembly (RCCA) within base station 140.

After performing step 410, the RCCA sets the base station 140 channel card with common physical channel modem setup information such as digital channel transmission power and scrambling code (step 420).

After setting the channel card, the RCCA locks the wireless output to prevent the wireless output (step 430). In step 430, the combiner of the path from the channel of the corresponding FA / sector within the RCCA to the base station sector conversion and up / down converter assembly (BUDA) is locked, or the cell is locked. Lock the input digital device inside BUDA of the corresponding FA / sector to be set up.

Even if CPICH, SCH and P-CCPCH are set up, once the wireless output is locked, the output will not go to the antenna. When step 420 and step 430 are completed, the RCCA transmits a channel setting completion message to a base station protocol.

A CTCH setup step, which is a setup operation for a sub-common control physical channel (S-CCPCH) and a physical random access channel (PRACH), which are common transport channels required for communication between the base station 140 and the wireless network control station 120, is performed ( Step 440).

After performing the CTCH step, the radio network controller requests SIB update from a base station protocol (BSP), the base station protocol requests update from a channel element, and the channel element transmits MIB, SB, and SIB to the channel card. Set the information. When the SIB setting is completed, the channel card notifies that the SIB has been updated with the RCCA and the base station protocol.

Upon receiving the notification message, the RCCA releases the radio output locked in the first step. From this moment, the base station performs normal cell setup radio output and performs calibration (step 450).

After performing step 450, normal call processing or communication between wireless networks is performed.

The above embodiments of the present invention are merely one embodiment of the technical idea of the present invention, and of course, other modifications are possible within the technical idea of the present invention.

According to the base station cell setup method in the W-CDMA system of the present invention having the configuration and operation process as described above has the following effects.

By reducing neighbor cell interference that may occur during the cell setup period of the base station, there is an effect of minimizing signal quality degradation and radio resource capacity reduction in the neighbor cell.

Claims (4)

In the base station cell setup process, Setting a channel card with a message from a wireless network control station; Setting a lock on a wireless output of the set channel; And releasing the set lock. The method of claim 1, wherein the establishing of the lock comprises: a combination of a path input to a base station sector conversion and up / down conversion assembly (BUDA) in a channel of a corresponding sector in a radio and channel control assembly (RCCA) of the base station. A base station cell setup method in a W-CDMA system, characterized by setting a lock on you. 2. The W-CDMA method of claim 1, wherein the setting of the lock comprises setting a lock on an input digital element in a base station sector conversion and up / down conversion assembly for a corresponding frequency and a corresponding sector to be set up in a cell. How to set up a base station cell in a system. 2. The method of claim 1, wherein the step of releasing the lock is executed when a channel information update request is received from a wireless network control station.