KR20000000647A - Communication system having base stations of daisy chain type, and thet method therefor - Google Patents

Abstract

PURPOSE: A communication system is provided to connect many base stations to a base station controller by daisy chain type for improving efficiency of interline. CONSTITUTION: In the communication system, base stations(10,..., 90) are connected together via one line by daisy chain type, and have own identification address. The base stations(10,..., 90) supply mobile services to corresponding mobile terminals which moves in a predetermined area. The base station controller(100) is connected to the first base station which is connected to the second base station by daisy chain type, and is connected to the mobile terminals by controlling the base stations(10,..., 90).

Description

Communication system using daisy chain base station and test method thereof

The present invention relates to a communication system using a daisy chain base station and a test method thereof, and more particularly, to a communication system in which a relay line connecting a base station supporting a small capacity and a base station controller in a mobile communication system is daisy chained. And a method for testing each base station and its relay line connected in a daisy chain manner.

Cellular Mobile Telecommunications System divides the entire service area into a plurality of base stations (BSs) to form cells, which are small service areas, and concentrates these base stations as switching systems. By controlling, the mobile subscriber can continue the call while moving between cells. Since the cellular system divides the service area into cells to enable spatial reuse of limited radio resources, the frequency utilization efficiency can be increased to accommodate a large number of subscribers.

The cellular mobile communication system, which started with analog AMPS (Advanced Mobile Phone Service), has been developed digitally such as time division multiple access (TDMA) and code division multiple access (CDMA).

A mobile communication system using a CDMA method includes a base station transceiver subsystem (BTS) that provides mobile communication service to a mobile terminal moving in a certain area, and a base station controller (BSC) that controls a plurality of base stations. ), A Mobile Switching Center (MSC) that connects a number of base station controllers to a public switched telephone network (PSTN).

Cellular mobile communication systems improve the efficiency of use of scarce frequencies, making them available to more users. The concept introduced to further increase the frequency efficiency is a cell division technique, and such cell division techniques include sector-cell, omni-cell, and micro-cell. There is this. A sector-cell divides a cell into three parts by separating a 120 degree antenna from side to side, and an omni-cell divides an inner cell from an outer cell by separating the antenna up and down. The micro-cell can obtain local call absorption effect in the coverage area of the parent base station by installing the parent base station (Macro cell) and the micro waveguide or the micro cell connected by the optical cable in the jamming area. have.

A base station in charge of one cell is connected to a base station controller using trunks. The base station controller connects each base station to a relay line and transmits a message packet. In this case, the packetized Inter-Processor Communication (IPC) protocol of the Unchannelized E1 method is used for efficient data transmission on the relay line.

1 illustrates a mobile communication system having a radial base station structure according to the prior art. As shown, the base station controller (BSC) 100 connects with the base stations 10, 20, 30, 40, 50, 60, 70, 80 and 90, respectively, using a relay line. do.

U.S. Patent No. 3,693,155, "COMMUNICATION SYSTEM", includes a plurality of message stations arranged in groups, a plurality of control stations arranged in groups, and the message stations combined with all other message stations. A communication system is disclosed that includes a pyramidal network including the control station.

However, when the base station controller and the base station are connected to each other by using one relay line using the above-described configuration, the waste of the relay line connecting the omni base stations having a very small call capacity compared to the capacity of the relay line is greatly increased.

A small base station (1FA / Omni) that supports one frequency assignment (FA) per omni supports about 20 traffic channels. However, a traffic packet that can be accommodated by one E1 relay line is about 90 channels except for a signaling packet. Therefore, a problem arises that the capacity of the wasted relay line is very large.

The present invention has been made to solve the problems of the prior art operating as described above, by using a daisy chain base station that can increase the use efficiency of the relay line by connecting a plurality of small capacity base station with the base station controller in a daisy chain method An object of the present invention is to provide a communication system.

Another object of the present invention is to provide a method for testing each base station connected in a daisy chain manner.

Other objects and advantages of the present invention will become more apparent from the following detailed description of the invention and the accompanying drawings.

1 is a network configuration of a mobile communication system using a radial base station according to the prior art.

2 is a network diagram of a mobile communication system using a daisy chain base station according to the present invention;

3 is a connection diagram of a mobile communication system using a daisy chain base station according to the present invention;

4 illustrates a daisy chain base station and a virtual path sharing a relay line according to the present invention.

Figure 5 shows the node allocation of the HINA for the base station connected in a daisy chain method according to the present invention.

<Explanation of symbols for main parts of the drawings>

100: base station controller (BSC)

10,20,30,40,50,60,70,80,90: base station (BTS)

200: base station management system

300: GCIN

302,402,412,502,512,522,532,542: HINA

304,404,414,504,514,524,534,544: HIPA

400,410: LCIN

500,510,520,530,540: BCIN

A preferred embodiment of a communication system using a daisy chain type base station according to the present invention, which is invented to achieve the above object,

At least one base station providing a mobile service to a mobile terminal moving within a certain area, the at least one base station being daisy chained with each other through one relay line, and having an identified address;

It is connected to the foremost base station of the daisy-chain-connected base station, and includes a base station controller for controlling a plurality of base stations connected to it and connected to the mobile exchange.

In an embodiment of the present invention, the base station controller groups and transmits addresses of message packets sent to one or more base stations connected in the daisy chain manner, and the base stations transmit a message having its own address among the grouped message packets. It is desirable to select and receive only packets.

The base station controller transmits the addresses of message packets sent to one or more base stations connected to the daisy chain without any multiplexing, and the base stations mask only a portion of addresses of the message packets to distinguish their own packets. It is desirable to receive,

Addresses of the message packet may have a form that may distinguish one or more base stations connected in the daisy chain manner from each other.

Preferably, the base stations bypass the remaining packets except for their own packets transmitted from the base station controller among the message packets,

Preferably, the base stations select their packets transmitted from the base station controller through masking.

Preferably, the base stations bypass the remaining packets except the ones generated by the message packets to the back base station.

Preferably, the base stations select packets generated by the base station from the base station controller through masking.

The relay line connecting one or more base stations connected in the daisy chain method is preferably duplicated in case of a failure in any one of the relay lines.

Preferably, the one or more base stations connected in the daisy chain manner perform system start-up loading after opening nodes in order from the first base station connected with the base station controller.

A preferred embodiment of a test method of a communication system using a daisy-chained base station according to the present invention for achieving another object of the present invention, provides a mobile service to a mobile terminal moving in a certain area, one relay line It is connected to each other via a daisy chain method, at least one base station having an identity identified with each other, the first base station connected in the daisy chain method, and controls a plurality of base stations connected to it A base station controller connecting to a mobile exchange,

Generating, by the base station controller, a packet for testing of the base stations connected in the daisy chain manner;

At least one base station connected in the daisy chain manner sequentially loops back the packet for the test.

In an embodiment of the present invention, the test method is preferably performed at the time of initialization of the system,

The test method is preferably performed at a time designated by the system operator,

The test method is preferably performed periodically by a cycle designated by the operator.

Another preferred embodiment of a test method for a communication system using a daisy-chained base station according to the present invention provides a mobile service to a mobile terminal moving within a certain area, and is connected to each other via a single relay line in a daisy chained manner. A base station controller connected to at least one base station having an identified address, and having an identified address, connected to the earliest base station connected in the daisy chain manner, and controlling a plurality of base stations connected to the base station and connected to a mobile exchange. In

Generating, by the base station controller, a packet for testing a specific base station among the daisy chained base stations;

The specific base station loops back the packet for the test.

In an embodiment of the present invention, the test method is preferably performed at the time of initialization of the system,

The test method is preferably performed at a time designated by the system operator,

The test method is preferably performed periodically by a cycle designated by the operator.

In this method, a small capacity base station is connected by daisy chaining using one relay line to increase the use efficiency of the relay line.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

2 illustrates a mobile communication system using a daisy chain base station according to the present invention. As shown, four base stations 60, 70, 80, 90 are daisy chained to base station controller 100. In addition, the base stations 20 and 30 and the base stations 40 and 50 are also connected to the base station controller 100 in a daisy chain manner.

Since the traffic capacity of one E1 relay line is about 90 channels and the capacity of the small base station is about 20 channels, it can be daisy chained to up to four base stations according to Equation 1.

20 (traffic channel / base station, link) × 4 (base station)

= 80 (traffic channel / link) ≤ 90 (traffic channel / link)

3 shows a connection diagram of a mobile communication system using a daisy chain base station according to the present invention. As shown, the base station controller (100) 110 through the Link Communication Interface Node assembly (LCIN) (410) 400 and the Gateway Communication Interface Node assembly (GCIN) 300, the base station manager (Base Station Manager: BSM) 200 is connected. Base stations 10 and 60 that are directly connected to base station controllers 100 and 110 are connected to LCIN 410 through base station communication interface node assembly (BCIN) 500 and 510.

Daisy Chained base stations 70, 80, and 90 are connected via their BCINs 520, 530, and 540 to the BCINs of the leading base stations 60, 70, and 80, respectively. 510, 520, and 530.

The base stations 60, 70, 80 and 90 connected in a daisy chain not only share a relay line, but also operate logically independently. That is, the base stations 60, 70, 80, and 90 are each connected with a virtual path. Therefore, the operation of each base station 60, 70, 80, 90 is basically the same as the operation of the general base station.

Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the preferred embodiment of the present invention. The base station controller 100 must deliver a message packet to a plurality of base stations 60, 70, 80 and 90 connected in a daisy chain manner. First, the LCIN 410 of the base station controller 100 transmits a message packet to the base stations 60, 70, 80, and 90 that are daisy chained through one port. Base stations 60, 70, 80, and 90, which are daisy chained, receive only message packets corresponding to them and bypass the remaining packets to the base stations at the back end.

Therefore, in the LCIN 410, an address of message packets transmitted to a base station connected by a daisy chain must be grouped and changed into a virtual address. The base stations select only their address among the grouped addresses to receive only their message packets. This grouping requires a separate multiplexing device in the LCIN 410.

However, if the address of the base station has a specific pattern (Pattern) and can be masked in the BCIN of each base station, separate address multiplexing is not necessary. The base station can also screen its own message packets with address masking. Table 1 shows the types of base station addresses that can be masked.

Maskable base station address group Base station address BTS # 0 XXX00XX BTS # 1 XXX01XX BTS # 2 XXX10XX BTS # 3 XXX11XX

As shown in Table 1, if any 2 bits of the 8-bit base station address can be used to distinguish 4 base stations connected in a daisy chain, each base station knows whether the packet is its own packet by masking only the specific 2 bits. Can be.

In addition to the message packet received from the base station controller, the base station has a message packet that it generates and sends to the base station controller. This message packet shall not be sent to the base station at the back end. Therefore, when sending a message packet to a base station at the back end, it is necessary to simultaneously perform masking to check whether the message is to be received and composite masking to check whether the message is generated by itself.

Table 2 and Table 3 show the types of addresses transmitted between a base station controller and a base station, or between a base station controller and a base station.

Example of address masking type between base station controller and base station Node A (BSC↔BTS) NA (Node Address) 0x 080CC0 MA (Masking Address) 0x FC3FFF Composite Masking Address (CMA) 0x 003F

Example of address masking type between base station and base station Node B (BTS↔BTS) NA (Node Address) 0x 080CC0 MA (Masking Address) 0x 0BFFFF Composite Masking Address (CMA) 0x 000F

The system start up loading of the base stations 60, 70, 80, 90 daisy chained as follows. Since each base station 60, 70, 80, 90 may be initialized only after the base station of the preceding stage is started up, the system loading is performed in order from the base station 60 of the foremost stage.

The front HIPA 514 receives the loading from the HIPA 414 of the LCIN 410 and opens the node of the HINA 512 to the BCIN 520 of the rear end. The HIPA 524 of the rear base station 70 stops loading. And subsequently open nodes of HINA 532 (542). When the node is opened in this way, a BTS Control Processor (BCP) is loaded, which can be loaded in any order.

Since the base stations connected in the daisy chain method are connected to the base station controller through the base station of the front end, if the relay line of any one of the base station has a problem, all the base stations of the back end can not operate. Therefore, for the safety of the system, the relay line connecting the front and rear ends is doubled.

Referring to the relay line test method of the mobile communication system configured as described above are as follows.

Conventional trunk line test method uses the last channel among the 32 channels constituting one trunk line as the channel for the test. However, the present invention cannot use the above scheme because the channels of the relay line are allocated to different base stations.

The on-line test for daisy-chained base station links (BLNK) is replaced by the existing on-line base station link test (TST_BLNK). This approach generates a packet for testing at HIPA 414 of LCIN 410 and at HIPA 514, 524, 534 and 544 of each BCIN 510, 520, 530, 540. Loop-back the packet to test the trunk and nodes. The trunk line test may be performed at system start-up, at a time specified by the operator, or periodically.

4 illustrates a daisy chain base station and a virtual path sharing a relay line according to the present invention. As shown, base station 0 (60) is connected to base station controller 100 via path 0 (Path0) 1, and base station 1 (70) is connected to base station 0 (60) via path 1 (2). Base station 2 80 is connected to base station 1 70 via path 2 (3). In this way, the maximum number of base stations can be connected as long as the capacity of the relay line allows.

The test method of the trunk line can be divided into two types. First, the test method based on the entire loop is to loop-back the test packet generated by the base station controller 100 in order from the base station or the most advanced base station. Secondly, the test method using an individual loop loops back test packets generated at the base station controller only at the corresponding base station through the virtual path.

For example, when performing a separate loop test for base station 1 70, the test packet is looped back from base station 1 70 through base station 0 60 and back to base station controller 100 through base station 0 60. Come back.

If the above test finds a faulty relay line, another redundant route should be used. The HINAs 512, 522, 532 and 542 of the BCIN 510, 520, 530, 540 manage the redundant relay lines as two bridges. Figure 5 shows the node allocation of the HINA for the base station connected in a daisy chain method according to the present invention.

As shown, relay line 0 and relay line 2 constitute bridge 0, and relay line 1 and relay line 3 constitute bridge 1. As shown in FIG. Bridge 0 and Bridge 1 are redundant, and if one bridge fails, another bridge can be used.

The present invention can be variously modified and can take various forms and only the specific embodiments thereof are described in the detailed description of the invention. It is to be understood, however, that the present invention is not limited to the specific forms mentioned in the detailed description of the invention, but rather includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. It should be understood to do.

The present invention operating as described above reduces the waste of relay lines by connecting a plurality of base stations supporting small capacity to one relay line using a daisy chain method. In addition, by providing a method for testing base stations connected in a daisy chain method, if one base station fails, another redundant relay line can be used immediately.

Claims (18)

At least one base station providing a mobile service to a mobile terminal moving within a certain area, the at least one base station being daisy chained with each other through one relay line, and having an identified address; And a base station controller connected to the foremost base station among the daisy chained base stations, the base station controller controlling a plurality of base stations connected to the daisy chained base station and connecting to a mobile switch. The method of claim 1, wherein the base station controller transmits a group of addresses of message packets sent to one or more base stations connected in the daisy chain manner, And the base stations select and receive only message packets having their own addresses from among the grouped message packets. The method of claim 1, wherein the base station controller transmits the addresses of message packets sent to one or more base stations connected in the daisy chain manner without separate multiplexing, and the base stations mask specific portions of addresses of the message packets. A communication system using a daisy chain base station, which receives only its own packet. The communication system according to claim 3, wherein the addresses of the message packet have a form that can distinguish one or more base stations connected in the daisy chain manner from each other. 2. A communication system according to claim 1, wherein the base stations bypass the other ones of the message packets transmitted from the base station controller to the back base station. 6. A communication system according to claim 5, wherein the base stations select their packets transmitted from the base station controller through masking. The communication system according to claim 1, wherein the base stations bypass the remaining packets except for the ones generated by the message packets to a back-end base station. 8. The communication system according to claim 7, wherein the base stations select a packet generated by the base station controller from a base station controller through masking. The communication system according to claim 1, wherein the relay line connecting one or more base stations connected in a daisy chain manner is redundant in case of a failure of any one relay line. The daisy chain method of claim 1, wherein the one or more base stations connected in a daisy chain manner perform system start-up loading after opening nodes sequentially from the first base station connected with a base station controller. Communication system using a base station. At least one base station that provides a mobile service to a mobile terminal moving within a certain area, is daisy-chained with each other through one relay line, and has an identified address; In the base station controller is connected to the foremost base station connected in the daisy chain method, and controls a plurality of base stations connected to it and connected to the mobile switch, Generating, by the base station controller, a packet for testing of the base stations connected in the daisy chain manner; And at least one base station connected in the daisy chain manner loops back the packet for the test sequentially. 12. The method of claim 11, wherein the test method is performed at initialization of the system. 12. The method of claim 11, wherein the test method is performed at a time designated by a system operator. 12. The method of claim 11, wherein the test method is performed periodically by a user-specified period. At least one base station that provides a mobile service to a mobile terminal moving within a certain area, is daisy-chained with each other through one relay line, and has an identified address; In the base station controller is connected to the foremost base station connected in the daisy chain method, and controls a plurality of base stations connected to it and connected to the mobile switch, Generating, by the base station controller, a packet for testing a specific base station among the daisy chained base stations; And looping back the packet for the test by the specific base station. 16. The method of claim 15, wherein the test method is performed at initialization of the system. The method of claim 15, wherein the test method is performed at a time designated by a system operator. The test method according to claim 15, wherein the test method is performed periodically by a period designated by an operator.