KR20020083627A - Method of building BTSs using Daisy Chain - Google Patents

Abstract

PURPOSE: A method for configuring a BTS(Base Transceiver System) using a daisy chain is provided to reduce a load about the installation and maintenance of a rent-type T1/E1 line by connecting the BTS to a BSC(Base Station Controller) which configures a pico-cell. CONSTITUTION: A BSC(23) connects to a plurality of BTSs(201-208) in series. A message is transmitted from the BSC(23) to a plurality of BTSs(201-208) using an address of the message transmitted from the BSC(23) between the BSC(23) and a plurality of BTSs(201-208). Packet data are transmitted to the BSC(23) using an address of the packet data generated in one BTS among a plurality of BTSs(201-208) between the BSC(23) and a plurality of BTSs(201-208).

Description

Base station configuration method using daisy chain {Method of building BTSs using Daisy Chain}

The present invention relates to a method for configuring a base station using a daisy chain and a computer readable recording medium having recorded thereon a program for realizing the method.

Conventionally, a base station was operated using one E1 / T1 leased line per base station. 1 is a configuration diagram of an embodiment of a conventional mobile communication base station system.

As shown in FIG. 1, the conventional system includes a public switched telephone network (PSTN) 11, a mobile switching center (MSC) 12, and a base station controller (BSC). 13 and several base stations (BTS) 101 to 107. This conventional system has a structure in which several base stations 101 to 107 interface to the control station 13 through different T1 dedicated leased lines. Usually at least 12 base stations are connected to one control station 13.

In this way, since each of the base stations (BTS) 101 to 107 under the control of the control station 13 are all connected to the control station 13 through the respective leased line, in case of the base station with low traffic, It was inefficient in terms of utilization, and there is a problem in that installation and maintenance costs for leased lines are increased.

That is, in the case of the base station for configuring the pico cell (Pico Cell), the connection between the control station and the base station through the leased T1 line. However, this requires excessive spending on the installation and maintenance costs for the T1 circuit of the pico cell base station with low traffic.

It is not desirable in terms of efficient resource management to use different T1 / E1 leased lines for base stations with low traffic.

In addition, in the case of an omni-shaped base station consisting of one sector, there is a problem in that a sector cannot be formed.

The present invention has been proposed in order to solve the above problems, and it is possible to realize a method and a method for configuring a base station using a daisy chain that can use a single leased line for several base stations and can sectorize an omni base station. Its purpose is to provide a computer readable recording medium having recorded thereon a program.

1 is a configuration diagram of an embodiment of a conventional mobile communication base station system.

2 is a diagram illustrating an embodiment of a pico base station system using a daisy chain according to the present invention;

3 is a diagram illustrating an embodiment of a main management board in a pico base station system using a daisy chain according to the present invention;

4 is an exemplary structural diagram of an address used in a conventional mobile communication base station system.

5A to 5B are structure diagrams of an embodiment of an address used in a pico base station system using a daisy chain according to the present invention;

FIG. 6 is a diagram illustrating an embodiment in which four base stations form a daisy chain in a pico base station system using a daisy chain according to the present invention; FIG.

7 is a diagram illustrating an embodiment of sectorizing an omni-shaped base station using a daisy chain according to the present invention.

* Explanation of symbols for the main parts of the drawings

11 public switched telephone network (PSTN)

12: mobile switching center (MSC)

13: control station (BSC: Base Station Controller)

101 to 107: base transceiver station (BTS)

In order to achieve the above object, the present invention provides a base station configuration method comprising: a first step of connecting a control station and a plurality of base stations in series; A second step of transferring the message from the control station to the plurality of base stations using the address of the message transmitted from the control station between the control station connected in series and the plurality of base stations of the first step; And a third step of transferring the packet data to the control station using the address of packet data generated at one of the plurality of base stations between the control station connected in series in the first step and the plurality of base stations. Characterized in that comprises a.

On the other hand, the present invention, the base station configuration system having a large capacity processor, the first function for connecting the control station and a plurality of base stations in series; A second function of transferring the message from the control station to the plurality of base stations using the address of the message transmitted from the control station between the control station and the plurality of base stations connected in series by the first function; And a third for transferring the packet data to the control station using the address of packet data generated at one of the base stations between the control station and the plurality of base stations connected in series by the first function. A computer readable recording medium having recorded thereon a program for realizing the function is provided.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a diagram illustrating an embodiment of a pico base station system using a daisy chain according to the present invention.

As shown in Fig. 2, the mobile communication base station system according to the present invention includes a public switched telephone network (PSTN) 21, a mobile switching center (MSC) 22, and a control station (BSC). A base station controller 23 and several base stations (BTSs) 201 to 208.

Unlike the conventional system shown in FIG. 1, in the present invention, by daisy chaining 2 to 4 base stations into one, a daisy chain can be used to prevent waste of excessive leased lines and to reduce maintenance costs. . In this way, approximately 48 (12 * 4) base stations can be connected to one control station 23.

As shown in FIG. 2, two to four base stations are grouped into one group to use one leased line, and other base stations in the group that are daisy chained to the control station 23 by using a private line. Configure a link.

3 is a diagram illustrating an embodiment of a main management board used in a pico base station system using a daisy chain according to the present invention.

In the case of the existing Pico-BTS, there is a T1 / E1 interface for connecting to the control station in the main processor board (hereinafter referred to as BCCP (BCP Contoller)) that manages the pico base station as a whole. .

On the other hand, the main management board used in the trunk link reduction method in the pico base station using the daisy chain according to the present invention has E1 for interfacing with the upper pico base station or the control station 32 to the BCPC board of the pico base station in the daisy chain configuration In addition to the / T1 trunk port 301, another daisy chain port 302 is required for interfacing with the underlying pico base station 33.

As shown in FIG. 3, the BCPC board 31 of the pico base station according to the present invention has a first port 301 for transmitting and receiving with an upper pico base station or a control station, and a second port for transmitting and receiving with a lower pico base station. 302, the message processing unit 303 for processing a message transmitted from the upper pico base station or control station 32 and the upper pico base station or control station 32 by receiving a signal from the lower pico base station 33 or message processing unit 303 Routing unit 304 for delivery to the network).

In order to distinguish the pico base stations that are daisy chained by the apparatus shown in FIG. 3, an address of the pico base stations should be allocated. For convenience, the pico base stations that are daisy chained are grouped and configured for grouping, which is the lowest of the existing addresses. Mask bits to form a group. For example, when four pico base stations are grouped, the least significant two bits are masked to form a group when the remaining address fields are the same.

At this time, if the address area except for the lower 2 bits of one's own address is different (hereinafter referred to as Group ID), the message is discarded. To pass. Such an address will be described in more detail with reference to FIGS. 4 to 5 below.

4 is a structural diagram of an embodiment of an address used in a conventional mobile communication base station system.

As shown in FIG. 4, an address used in a conventional mobile communication base station system includes a base station ID of 4 bits (upward), a control station ID of 4 bits, a base station ID of 1 bit (downward), and a base station of 8 bits. It consists of a detailed node representing a block, a test bit of 1 bit, a GCIN ID representing the routing assignment of a router located in a control station of 2 bits, a blink ID of 4 bits, and a software address of 8 bits.

5A to 5B are structural diagrams of an embodiment of an address used in a pico base station system using a daisy chain according to the present invention.

As shown in Fig. 5a to 5b, the address used in the pico base station system using a daisy chain according to the present invention is a base station ID (up) of 4 bits, a control station ID of 4 bits, a base station ID of 1 bit (downward) ), A detailed node representing a block inside an 8-bit base station, a test bit of 1 bit, a GCIN ID representing the routing assignment of a router located in a control station of 2 bits, a blink ID of 4 bits, and a software address of 8 bits. It is composed.

If they are not the same link ID, the connection between the pico base stations becomes inconsistent and there is difficulty in hardware configuration. Therefore, the base stations that are daisy-chained must use the same Frequency Assignment (FA) base station or the same link ID (Blink_ID). .

Base stations that are daisy chained must have a set of base station IDs and group them by 2n units. This is because, in the case of the downlink from the control station to the base station, the base station, which is daisy chained, has to operate in the form of masking the base station ID area. If you do not have a set of base station IDs, all address fields must be checked, and the messages to be delivered to the next pico base station cannot be distinguished, and all messages must be delivered to the next pico base station. There is no choice but to.

As shown in FIG. 5A, when there are two groups of base stations connected by daisy chains, the last least significant bit (LSB: Least Significant Bit) of the base station ID among the downlink node addresses from the control station to the base station is masked and routed. .

As shown in FIG. 5B, when there are four groups of base stations in a daisy chain, the last two bits of the last least significant bit (LSB) of the base station ID among downlink node addresses from the control station to the base station are shown. Mask by routing.

A method of transmitting and receiving a message using the address system of 5a to 5b is as follows.

First, in case of reception, if the group ID consisting of 6 bits of the base station ID is the same, it is bypassed and transmitted to the corresponding pico base station connected by daisy chain, and the group ID consisting of 6 bits of the base station ID If different, discard the information.

In the transmission, the routing unit collects the transmission packets from each pico base station connected in the daisy chain to the control station and transfers them to the next pico base station or control station in the daisy chain.

FIG. 6 is a diagram illustrating an embodiment in which four base stations form a daisy chain in a pico base station system using a daisy chain according to the present invention.

6 is a pico base station system using a daisy chain in accordance with the present invention, as shown in the configuration example of the case where four base stations form a daisy chain, two sets of pico base station is configured as a daisy chain, each pico base station Assume that the base station IDs of 62 to 65 are 0, 1, 2, and 3.

In transmission from the control station 61 to the base stations 62 to 65, the control station 61 matches the mobile switching center ID and the control station ID in the address of the transmission data packet, and the 6 bits (group ID) of the base station ID match. The control station 61 then transmits data to the 0 base station.

Base station 62, if the 0, 1st bit of the trunk ID of the base station in the address of the received packet '00' is determined as the data of the base station 0 itself, or if the lower 2 bits of the base station ID of the packet address If it is '00', it is determined as its own data and transmitted to the corresponding unit, and if it is not '00', it is transmitted to the next base station 63.

Similarly, in the first base station 63, if the first and second bits of the trunk ID of the base station are '01', the base station 63 determines the data of the first base station itself, or the lower two bits of the base station ID in the packet address are '01'. If it is, it determines its own data and transmits it to the corresponding unit (module constituting the base station). Hereinafter, operations of base station Nos. 64 to No. 3 are as described above.

In addition to the above operation, the base station 62 to 65 compares the lower two bits of its own address area of the base station ID with the received packet, and if it is the same, recognizes it as a packet coming to the base station itself and transmits it to the corresponding unit in the base station. Transfer to the next base station.

On the other hand, in the transmission from the base stations 62 to 65 to the control station 61, if the destination of the packet data generated at the lower base stations (for example, the base stations 1 to 3) is not the address of the base station itself (i.e., the unit in the base station) Since no node except the node connected to the trunk connected to the upper base station from the lower base station has a corresponding address, the node is transmitted to the base station No. 0 (62), which is the highest base station.

Here, the base station 62, 0, is not its own address as a result of the destination address check, and transmits it to the control station 61.

Meanwhile, the present invention provides a daisy chain link status diagnosis and status monitoring function. Here, daisy chain link state diagnosis and state monitoring refer to link diagnosis between a control station and a base station.

To do this, the LCIN HICA of the control station 61 manages the link as polling with each base station in the daisy chain through the nodes of one control station trunk card and links to the control station or the base station manager system (BSM). Report. At this time, the link test is performed as a polling test between the control station 61 and the daisy chain base station.

7 is a diagram illustrating an embodiment of sectorizing an omni base station using a daisy chain according to the present invention.

In the case of the base stations 74 to 79 configured in an omni shape, they can be sectorized through a daisy chain. As shown in FIG. 7, three base stations (74 to 76 or 77 to 79) are installed at one site, and daisy chains are used to install sector antennas at each base station to use them as if they were three sector base stations. have.

As described above, the method of the present invention may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be apparent to those of ordinary knowledge.

The present invention as described above, by connecting the base station and the control station constituting the pico cell in a simple way using a daisy chain has the effect of reducing the burden on the installation and maintenance of the lease-type T1 / E1 line.

In addition, the present invention has the advantage that it is possible to operate as a sector base station by installing several base stations having a 1FA / 1 sector shape in one place, and in the case of a low traffic base station, it is possible to efficiently use resources by combining several base stations into one.

Claims (6)

In the base station configuration method, A first step of connecting the control station and the plurality of base stations in series; A second step of transferring the message from the control station to the plurality of base stations using the address of the message transmitted from the control station between the control station connected in series and the plurality of base stations of the first step; And A third step of transferring the packet data to the control station using the address of packet data generated at one of the plurality of base stations between the control station connected in series in the first step and the plurality of base stations; Base station configuration method using a daisy chain comprising a. The method of claim 1, The second step, A fourth step of identifying, by the highest base station closest to the control station of the plurality of base stations connected in series, the address of the message transmitted from the control station; If the group ID composed of the upper 6 bits of the base station ID is the same in the address of the message, the message transmitted from the control station is accepted. If the group ID composed of the upper 6 bits of the base station ID is not the same, the message transmitted from the control station is not the same. A fifth step of skipping; And The base station connected close to the control station among the plurality of base stations compares the lower bits of the base station ID in the address of the message received in the fifth step, and transfers the message to the next connected base station if it is not its own address. A sixth step of transmitting the message to the corresponding unit in the base station Base station configuration method using a daisy chain comprising a. The method according to claim 1 or 2, The third step, A seventh step of the base station confirming the destination address of the packet data; An eighth step of delivering the packet data to a corresponding unit in the base station if the destination address is the base station itself as a result of the checking in the seventh step; A ninth step of delivering the packet data to a higher base station connected to the base station if the destination address is not the base station as a result of the checking of the seventh step; A tenth step of transmitting the packet data to the highest base station by repeating the process of the ninth step; And An eleventh step of forwarding the packet data to the control station at the highest base station Base station configuration method using a daisy chain comprising a. The method according to any one of claims 1 to 3, A method for constructing a base station using a daisy chain, characterized in that a plurality of base stations of claim 1 are installed in one region and sector antennas are installed in each base station, and the connected base stations are used as one multisector base station. . The method according to any one of claims 1 to 3, Each base station connected to connect the plurality of base stations in series in the first step, having a daisy chain port for connection with a lower base station far from the control station Configuration method. In a base station configuration system having a large processor, A first function of connecting a control station and a plurality of base stations in series; A second function of transferring the message from the control station to the plurality of base stations using the address of the message transmitted from the control station between the control station and the plurality of base stations connected in series by the first function; And A third function of transferring the packet data to the control station between the control stations connected in series by the first function and the plurality of base stations using the address of packet data generated at one of the plurality of base stations; A computer-readable recording medium having recorded thereon a program for realizing this.