KR20100092701A - Apparatus, system for sending pilot beacon signal for hand-off and method thereof - Google Patents

Abstract

PURPOSE: An apparatus, a system, and a method for sending a pilot beacon signal for handoff and a method thereof are provided to supply information of the PCCPCH(Primary Common Control Packet Channel), thereby increasing a success rate of handoff. CONSTITUTION: A signal generating unit(220) generates the first channel for transmission of information including data based on an RF signal transmitted from a base station, the second channel including synchronization information, and the third channel providing a phase reference. The signal generating unit generates a pilot beacon signal by combination of the generated channels. A transmitting unit(230) transmits the generated pilot beacon signal to a terminal.

Description

Apparatus, system for sending pilot beacon signal for hand-off and method etc.

The present invention relates to an apparatus, a system and a method for pilot beacon transmission for handoff, and more particularly, to an apparatus, a system and a method for supporting handoff using a pilot beacon transmission apparatus in a WCDMA communication system.

The handoff service based on the mobile communication network includes a soft handoff method and a hard handoff method. The soft handoff method is the same from two base stations at the same time while the mobile terminal is between a serving base station and an adjacent base station. The hard handoff method refers to a call channel allocated to a call, and when the frequencies used in the serving base station and the neighboring base station are different, the hard handoff method disconnects the current frequency and replaces the call with a new frequency supported by the neighboring base station to continue the call.

Conventionally, the existing widely used patent for supporting hard handoff in the FA boundary area converts a base station signal and uses it as a pseudo frequency, which is a general technique widely used in 2G. Here, the call channel is used for coverage matching.

However, for the handoff of the terminal, the call channel is an unnecessary channel only for the purpose of matching coverage. In addition, since 2G has a frequency in the terminal, the beacon equipment only has a forward path because the network needs to send related frequency information.

On the other hand, unlike 2G, 3G does not have frequency information in the terminal. Therefore, because the terminal and the network must communicate with each other, both the forward channel and the reverse channel should be used. In addition, there is a method in which a part of the frequency is copied in WCDMA to transmit a band, and the Ec / Io or RSSI is severely forced through a signal disconnection to force a handoff. However, in the case of the above method, not only the capacity of the linear amplifier using the communication channel should be used, but also the situation in which an artificial handoff occurs, the call attempt rate and success rate may drop in the FA boundary area.

Accordingly, there is a need for a method for improving the success rate of handoff in a WCDMA communication system.

An object of the present invention is to support an efficient handoff using a pilot beacon transmission apparatus in a WCDMA communication system.

The objects of the present invention are not limited to the above-mentioned objects, and other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the pilot beacon transmission apparatus for handoff according to an embodiment of the present invention, the first channel for transmitting information including data based on the RF signal transmitted from the base station, the synchronization information includes A signal generator for generating a second channel and a third channel providing a phase reference, synthesizing the generated channels to generate a pilot beacon signal, and a transmitter for transmitting the generated pilot beacon signal to a terminal; .

In addition, the method for transmitting a pilot beacon signal for handoff according to an embodiment of the present invention, the first channel for transmitting information including data based on the RF signal transmitted from the base station, the first channel including the synchronization information Generating a third channel providing two channels and a phase reference, and transmitting the generated pilot beacon signal to the terminal.

In addition, the pilot beacon transmission system for handoff according to an embodiment of the present invention, the base station for transmitting the RF signal, a first channel for transmitting information including data based on the transmitted RF signal, synchronization A pilot beacon transmitting apparatus generating a second channel including information and a third channel providing a phase reference, and synthesizing the generated channels to generate a pilot beacon signal, and a handoff based on the generated pilot beacon signal It includes a terminal to perform.

Specific details of other embodiments are included in the detailed description and the drawings.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, and only the embodiments make the disclosure of the present invention complete, and the general knowledge in the art to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

According to the pilot beacon transmission apparatus, system and method for handoff of the present invention as described above has one or more of the following effects.

First, in the pilot beacon transmission apparatus based on the WCDMA communication system, by providing information of the primary common control physical channel (PCCPCH), there is an advantage that the success rate of handoff can be improved.

Second, there is an advantage in that the capacity of the linear amplifier is reduced by not using unnecessary talk channels, and beacon coverage and base station coverage can be kept the same.

Third, by implementing the pilot beacon transmission apparatus using the parameters of the 3GPP standard, there is an advantage that it can be used in general because it can meet the international standard.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a pilot beacon transmission system for handoff according to an embodiment of the present invention.

As shown, the pilot beacon transmission system for the handoff is configured to include a communication network 100, the pilot beacon transmission apparatus 200 and the terminal 300. Here, the pilot beacon transmission device 200 may be understood as a repeater.

In an embodiment of the present invention, the communication network 100 may be a wideband code division multiple access (WCDMA) mobile communication network.

When the communication network 100 according to the embodiment of the present invention is a WCDMA network, the communication network 100 uses a base station 110 and a base station 110 to which a wireless access standard of 3GPP (3rd Generation Partnership Project) standard is applied to support WCDMA. It may include a Radio Network Controller (RNC) 120 for controlling.

The base station 110 supports various radio access technologies such as channel coding, interleaving, modulation, and demodulation for data transmission in a radio section. The base station 110 generally refers to a fixed station that communicates with a repeater (ie, the pilot beacon transmitting apparatus 200), and includes a node-B, a base transceiver system, and an access point. (Access Point) may be called, but is not limited thereto. The base station controller 120 dynamically allocates radio resources of the system and controls the base station 110.

The pilot beacon transmitter 200 receives a signal transmitted from the base station 110, amplifies the signal by a gain G through an amplifier (not shown), and radiates the signal. Here, the pilot beacon transmission device 200 is a repeater for preventing the phenomenon that the phone is disconnected while moving because the frequency is different for each region.

That is, the received signal from the base station 110 is generated to generate a synchronization channel (SCH), a common pilot channel (CPICH), and a primary common control physical channel (PCCPCH). do. The generated sync channel (SCH), common pilot channel (CPICH) and primary common control physical channel are then synthesized to generate and transmit a pilot beacon signal. Here, the process of decoding the received signal to generate a primary common control physical channel (PCCPCH) is further performed.

Accordingly, the terminal 300 may know the frequency information to perform the handoff by receiving and demodulating the pilot beacon signal transmitted from the pilot beacon transmitting apparatus 200, and performs the handoff at the corresponding frequency. Hereinafter, the pilot beacon transmission apparatus 200 in FIG. 2 will be described in detail.

Referring to the channels of WCDMA used in the present invention, the common pilot channel (CPICH) is composed of a primary pilot channel and a secondary pilot channel. The primary pilot channel acts like a pilot channel in the CDMA scheme and provides the phase reference of all channels (except the secondary pilot channel). And only one channel exists. The secondary pilot channel serves as a secondary pilot channel in the CDMA scheme, supports a smart antenna function to concentrate the antenna beam in a specific region, and a plurality of channels may be used. The secondary common pilot channel can be used as the phase reference of the secondary common control channel and the designated channel.

The synchronization channel (SCH) is a channel having the most basic synchronization information to be obtained first by the terminal 300, and consists only of a primary synchronization code and a secondary synchronization code that have not been scrambled. In addition, the carrier is modulated along with other physical channels that have been scrambled, and then transmitted through an antenna through frequency reverse conversion and amplification.

The primary common control physical channel (PCCPCH) is a channel used to transmit information related to a specific system or a cell to all mobile communication terminals in the cell.

That is, a broadcast channel (BCH) for transmitting data on a primary common control physical channel (PCCPCH) is transmitted, and common pilot bits are transmitted as control information required for correlation detection. In addition, no information is transmitted during the 256-chip period at the beginning of each slot of the primary common control physical channel (PCCPCH). Instead, during the 256-chip period, the primary SCH (P-SCH) and the secondary synchronous channel (secondary) are used. SCH: S-SCH) is transmitted. In other words, the primary common control physical channel (PCCPCH) is a data portion for carrying a broadcast channel (BCH), a pilot symbol portion for transmitting common pilot bits, and a blank portion for carrying a synchronization channel (SCH). Divided into

The terminal 300 may be a mobile communication device such as a mobile phone or a personal digital assistant (PDA), and the terminal 300 may hold a terminal identifier. In addition, the terminal identifier is a unique value for identifying the corresponding terminal 300 from another terminal, and may be assigned for each terminal by a terminal manufacturer or an authorized institution when the terminal 300 is produced.

2 is a diagram illustrating an internal block diagram of an apparatus for transmitting pilot beacons for handoff according to an embodiment of the present invention.

As shown, the pilot beacon transmission apparatus 200 is configured to include a receiver 210, a signal generator 220, a transmitter 230 and the controller 240.

In this case, the term '~ part' used in the present embodiment refers to software or a hardware component such as an FPGA or an ASIC, and '~ part' performs certain roles. However, '~' is not meant to be limited to software or hardware. '~ Portion' may be configured to be in an addressable storage medium or may be configured to play one or more processors. Thus, as an example, '~' means components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, procedures, and the like. Subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functionality provided within the components and the 'parts' may be combined into a smaller number of components and the 'parts' or further separated into additional components and the 'parts'.

The receiver 210 receives a signal (ie, an RF signal) transmitted from the base station 110. Here, the received signal includes predetermined information for generating a synchronization channel (SCH), a common pilot channel (CPICH) and a primary common control physical channel (PCCPCH).

The signal generator 220 generates a synchronization channel (SCH), a common pilot channel (CPICH), and a primary common control physical channel (PCCPCH) based on the received signal, and generates the generated synchronization channel (SCH) and a common pilot channel ( CPICH) and primary common control physical channel (PCCPCH) to synthesize a pilot beacon signal. Here, the signal generator 230 includes one or more channel generators, each of which generates a synchronization channel (SCH), a common pilot channel (CPICH) and a primary common control physical channel (PCCPCH). Hereinafter, the signal generator 220 will be described in detail with reference to FIG. 3.

The transmitter 230 transmits the output signal amplified through the power amplifier LPA to the terminal 300.

The control unit 240 controls the operation of each of the functional blocks (210 to 230) constituting the pilot beacon transmission apparatus 200.

3 is a block diagram illustrating an internal portion of a signal generator according to an exemplary embodiment of the present invention. Here, the pilot beacon transmission apparatus 200 is based on the WCDMA system scheme.

As shown, the signal generator 220 includes a down converter 410, an A / D converter 420, a decoder 430, a channel generator 440, a channel synthesizer 450, and a D / A converter. And 460.

The down converter 410 down-converts the frequency of the signal (ie, the RF signal) received from the receiver 210 to an intermediate frequency (IF) frequency.

The A / D converter 420 converts the signal dropped to the IF frequency into a digital signal using a system clock.

The decoding unit 430 decodes the converted digital signal and extracts predetermined information. Here, the predetermined information may be understood as a master information block (MIB) and a system information block (SIB), and the predetermined information is used to generate a primary common control physical channel (PCCPCH).

The channel generator 440 generates a synchronization channel (SCH) and a common pilot channel (CPICH) based on the converted digital signal, and generates a primary common control physical channel (PCCPCH) based on the decoded and extracted predetermined information. do. Here, the channel generator 440 includes a first channel generator 441, a second channel generator 442, and a third channel generator 443. That is, the first channel generator 441 generates a primary common control physical channel (PCCPCH) using the information extracted through the decoder 430 (that is, MIB and SIB), and the second channel generator 442. ) Generates a sync channel (SCH), and the third channel generator 443 generates a common pilot channel (CPICH). Here, it may be understood that the first channel is for transmitting information including data, the second channel is including synchronization information, and the third channel provides a phase reference.

For example, the information to be transmitted to the terminal 300 in the primary common control physical channel (PCCPCH) is MIB, SIB3 and SIB11. In addition, the single frequency network (SFN) is synchronized with the base station 110, the Public Land Mobile Network (PLMN) of the base station 110 is transmitted using the MIB, thereby receiving and decoding the MIB from the base station 110, The primary common control physical channel (PCCPCH) is generated using the information extracted through decoding. Here, all information of the primary common control physical channel (PCCPCH) may be decoded, or only MIB / SIB3 / SIB11 may be decoded and input again when the primary common control physical channel (PCCPCH) is generated.

In addition, when transmitting the SIB3 to the terminal 300, using the Access Restriction Field to inform that the channel currently received by the terminal 300 is a beacon signal (Beacon) signal, the terminal 300 is based on this base station 110 service Instruct the handoff to the frequency you are doing. Here, an abstract syntax notation (ASN) encoder and a decoder should be implemented for reception and transmission of MIB and transmission of SIB3 / SIB11. In addition, SIB3 provides information to search for another FA, and information about which FA to drop through the "Intra-frequency cell info list" of SIB 11. Here, it is possible to perform a handoff without transmitting SIB 11, but in this case, a little more time may be consumed when transitioning to another FA.

The channel synthesizer 450 generates a pilot beacon signal by synthesizing the signals of the primary common control physical channel (PCCPCH), the synchronization channel (SCH), and the common pilot channel (CPICH) generated by the channel generator 440. .

 The D / A converter 460 converts the signal synthesized by the channel combiner 450 (that is, the pilot beacon signal) into an analog signal and outputs the analog signal.

4 is a table illustrating an example of an SIB3 message included in a pilot beacon signal transmitted by an apparatus for transmitting pilot beacons for handoff according to an embodiment of the present invention.

As shown, the table 40 containing the SIB3 message comprises an information name field 41, an information type field 42 and a description field 43.

The information name field 41 indicates operation information that the terminal 300 should perform, the information type field 42 indicates the type of operation information that the terminal 300 should perform, and the description field 43 indicates the terminal. A description of the operation 300 should be performed.

For example, the terminal 300 checks the SIB3 message transmitted through the primary common control physical channel (PCCPCH), and if the information type is "Barred", prohibits the access of the FA at the current frequency and "Not allowed". If is searched for another FA. Here, the above specific information (ie Barred and Not allowed) is included in the system information (ie, SIB3), and information about the cell is obtained from the specific information included in the system information. Also, the hard handoff is performed by acquiring frequency information of the corresponding cell among the information about the corresponding cell.

5 is a diagram illustrating an example of handoff of the pilot beacon method according to an embodiment of the present invention.

As shown, base station 1 51 communicates at the frequency of FA2 in cell A, and adjacent base station 2 52 communicates at the frequency of FA2 in cell B. The terminal 300 communicates with the base station 1 51 at the frequency of FA2 in the cell A, and detects a signal of a pilot cell having a frequency of FA2 transmitted from the cell B of the adjacent base station 2 52. do. In this case, when the magnitude of the signal of the pilot cell is greater than or equal to the threshold value, the terminal 300 performs handoff. In this case, system information (ie, information included in the primary common control physical channel (PCCPCH)) of the signals in the pilot cell is used. , SIB3 information).

As a result of checking the system information, if it is " not barred " at the current frequency FA2, the terminal 300 can know that the communication frequency of the adjacent base station 2 52 is communicating with FA2, which is the same frequency. And performs a sort handoff.

However, when base station 2 52 communicates at the frequency of FA2 in cell B and adjacent base station 3 53 communicates at the frequency of FA1 in cell C, terminal 300 is the first of the signals in the pilot cell. Checking the system information (ie, SIB3 information) included in the common control physical channel (PCCPCH), and checking the system information, "barred" to the current frequency FA2 "and" not allowed other FAs. " ", The terminal 300 checks the system information (ie, SIB 11 information) included in the primary common control physical channel (PCCPCH) among the signals in the pilot cell to determine that the communication frequency of the adjacent base station 3 (53) It finds out that it is FA1, and changes frequency to FA1, that is, performs hard handoff to perform continuous communication.

6 is a flowchart illustrating a method of performing handoff using a pilot beacon transmission apparatus for handoff according to an embodiment of the present invention. Here, the pilot beacon transmission apparatus 200 is based on the WCDMA system scheme.

First, when the RF signal is transmitted from the base station 110 (S610), the receiver 210 of the pilot beacon transmitting apparatus 200 receives the transmitted RF signal.

Next, the signal generator 220 of the pilot beacon transmitter 200 generates a synchronization channel (SCH), a common pilot channel (CPICH) and a primary common control physical channel (PCCPCH) based on the received signal (S620). ), A pilot beacon signal is generated by synthesizing the generated sync channel (SCH), common pilot channel (CPICH) and primary common control physical channel (PCCPCH) (S630).

The process of generating the pilot beacon signal of the present invention will be described in detail. First, the down converter 410 of the signal generator 220 drops the frequency of the RF signal received from the receiver 210 to the IF frequency. Next, the A / D converter 420 converts the signal dropped to the IF frequency into a digital signal using the system clock, and the decoding unit 430 decodes the converted signal into a digital signal and extracts predetermined information. Here, the predetermined information may be understood as MIB and SIB, and the decoded and extracted information is used to generate a primary common control physical channel (PCCPCH).

Next, the first channel generator 441 generates a primary common control physical channel (PCCPCH) using the information extracted through the decoder 430 (that is, the MIB and the SIB), and the second channel generator ( 442 generates a sync channel (SCH), and the third channel generator 443 generates a common pilot channel (CPICH).

Subsequently, the channel synthesizer 450 generates a pilot beacon signal by synthesizing the generated signals of the primary common control physical channel (PCCPCH), the synchronization channel (SCH), and the common pilot channel (CPICH), respectively, and the D / A. The converter 460 converts the generated pilot beacon signal into an analog signal.

Next, the transmitter 230 of the pilot beacon transmitting apparatus 200 transmits the generated pilot beacon signal (that is, the pilot beacon signal converted into an analog signal) to the terminal 300 (S640). Next, the terminal 300 receives and analyzes the transmitted pilot beacon signal to perform a handoff (S650).

7 is a diagram illustrating a signal generator extended to a plurality of sectors according to an exemplary embodiment of the present invention.

The base station 110 may be divided into three sectors of α, β, and γ sectors at intervals of 120 degrees. Here, respective channel generators 440-1, 440-2, and 440-3 for the α, β, and γ sectors, respective channel synthesizers 450-1, 450-2, and 450-3, respectively D / A converters 460-1, 460-2, and 460-3, and respective frequency converters.

That is, when the 3-sector signal is coupled and input to each of the channel generators 440-1, 440-2, and 440-3, a scrambling code is searched for the 3-sector signal, and each A channel is generated for each sector using the same scramble code as that of the base station, and automatically searches for a FA used by the base station and an unused FA for the 3 sector signal, and generates a pilot beacon signal for the unused FA. Here, each sector may have a different frequency, and in this case, the frequency converter may be implemented to have respective frequencies Fα, Fβ, and Fγ.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. You will understand that. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

1 is a diagram illustrating a pilot beacon transmission system for handoff according to an embodiment of the present invention.

2 is a diagram illustrating an internal block diagram of an apparatus for transmitting pilot beacons for handoff according to an embodiment of the present invention.

3 is a block diagram illustrating an internal portion of a signal generator according to an exemplary embodiment of the present invention.

4 is a diagram illustrating an example of an SIB3 message included in a pilot beacon signal transmitted by a pilot beacon transmitting apparatus for handoff according to an embodiment of the present invention.

5 is a diagram illustrating an example of handoff of the pilot beacon method according to an embodiment of the present invention.

6 is a flowchart illustrating a method of performing handoff using a pilot beacon transmission apparatus for handoff according to an embodiment of the present invention.

7 is a diagram illustrating a signal generator extended to a plurality of sectors according to an exemplary embodiment of the present invention.

<Explanation of symbols on main parts of the drawings>

200: pilot beacon transmission device

210: receiver 220: signal generator

230: transmitter 240: controller

430: decoding unit 440: channel generation unit

450: channel synthesis unit 300: terminal

Claims (11)

Based on the RF signal transmitted from the base station, a first channel for transmitting information including data, a second channel including synchronization information, and a third channel providing a phase reference, synthesized the generated channels and pilot A signal generator for generating a beacon signal; And And a transmitter configured to transmit the generated pilot beacon signal to a terminal. The method of claim 1, And wherein the first channel is a primary common control physical channel (PCCPCH), the second channel is a synchronization channel (SCH), and the third channel is a common pilot channel (CPICH). The method of claim 1, The signal generator, And a decoding unit for extracting predetermined information by decoding the transmitted RF signal. The method of claim 3, wherein The predetermined information extracted by the decoding unit is a MIB and SIB, pilot beacon transmission apparatus for handoff. The method of claim 3, wherein And generating a primary common control physical channel (PCCPCH) based on the decoded and extracted predetermined information. Generating a first channel for transmitting information including data based on the RF signal transmitted from the base station, a second channel including synchronization information, and a third channel providing a phase reference; Synthesizing the generated channels to generate a pilot beacon signal; And Transmitting the generated pilot beacon signal to a terminal, the pilot beacon signal for handoff. The method of claim 6, Wherein the first channel is a primary common control physical channel (PCCPCH), the second channel is a synchronization channel (SCH) and a third channel is a common pilot channel (CPICH). The method of claim 6, Decoding the transmitted RF signal and extracting predetermined information; transmitting a pilot beacon signal for handoff. The method of claim 8, And wherein the extracted predetermined information is a MIB and an SIB. The method of claim 8, And generating a first common control physical channel (PCCPCH) based on the decoded and extracted predetermined information. A base station transmitting an RF signal; A pilot beacon is generated by generating a first channel for transmitting information including data based on the transmitted RF signal, a second channel including synchronization information, and a third channel providing a phase reference, and synthesizing the generated channels. A pilot beacon transmitting device generating a signal; And And a terminal performing a handoff based on the generated pilot beacon signal.

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