KR100621649B1 - Data transmission method between heterogeneous mobile communication systems for soft handoff - Google Patents

Abstract

The present invention relates to a data transmission method for realizing a high success rate of soft handoff without disconnection between systems of different manufacturers or manufacturing methods, and after generating a frame according to a handoff request, a destination address in a first system. The first step of setting the according to the logical address system irrespective of the system, the source address is set according to the address system of the first system and transmitted; And converts the source address into a logical address system for a frame transmitted from the first system in a second system of a different type from the first system and a matching device located between the first system, and converts the destination address into the system. A second step of converting the address system according to an address system of the second system and transmitting the converted address to the second system; A third step of setting, by the second system, a destination address in the system according to a logical address system and setting a source address in accordance with the address system of the second system to transmit a frame to the first system; And converting, from the matching device, the source address into a logical address for a frame transmitted from the second system, converting the destination address according to the address system of the first system, and transmitting the converted address to the first system. It includes 4 steps.

Wireless communication, soft handoff, handoff, communication protocol

Description

METHODO FOR TRANSMISSION DATA BETWEEN HETEROGENEOUS SYSTEMS FOR SOFT HAND OFF}

1 is a view for explaining a data transmission process between heterogeneous systems to which the present invention is applied.

2a and 2b is a block diagram of a logical address for data transmission between heterogeneous systems according to the present invention.

3 is a view for explaining a logical address setting process between heterogeneous systems according to the present invention.

4 is a schematic diagram of a frame transmitted and received between heterogeneous systems.

5 is a flowchart illustrating a data transmission method between heterogeneous systems according to the present invention.

6 is a flowchart illustrating a soft handoff processing procedure to which the present invention is applied.

* Explanation of symbols for the main parts of the drawings

101: ATM switch 102: System A matching module

103: System B matching module 104: ATM matching module

105: ATM matching module

The present invention relates to a data transmission method between heterogeneous mobile communication systems for soft handoff, and more particularly, to a data transmission method for stably transmitting data during soft handoff processing between heterogeneous mobile communication systems having different manufacturers or manufacturing methods. And a computer readable recording medium having recorded thereon a program for executing the same.

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In the Code Division Multiple Access (CDMA) wireless communication system, the communication protocol between the base station control station (BSC) and the mobile switching center (MSC) is defined, but the base station control station (BSC) and the base station (BS: Base Station) Since the communication protocol is not defined, the method is different for each manufacturer (CDMA wireless communication system manufacturer). Therefore, the handoff that occurs between systems of different manufacturers or manufacturing methods is performed after the message communication with each other in the mobile exchange, which is the highest in the system structure, by allocating a new communication channel in the new mobile exchange and releasing the existing communication channel. To pass.

However, in this process, there is a momentary disconnection of the sound, and such a hard handoff (this type of handoff is called a hard handoff because of the instantaneous disconnection of the sound). In the case of handoff), since the handoff occurs several times at the time of occurrence, the success rate is lower than that of other handoffs.

The present invention devised to solve the problems as described above, the frame address can be used between different systems in order to implement a soft handoff with high success rate without negative disconnection even between systems of different manufacturers or manufacturing methods It is an object of the present invention to provide a data transmission method between heterogeneous mobile communication systems for transmitting data and a computer readable recording medium storing a program for executing the same.

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In order to achieve the above object, the present invention provides a data transmission method for soft handoff between heterogeneous mobile communication systems having different manufacturers or manufacturing methods, and after generating a frame according to a handoff request, a destination address in a first system. The first step of setting the according to the logical address system irrespective of the system, the source address is set according to the address system of the first system and transmitted; And converts the source address into a logical address system for a frame transmitted from the first system in a second system of a different type from the first system and a matching device located between the first system, and converts the destination address into the system. A second step of converting the address system according to an address system of the second system and transmitting the converted address to the second system; A third system for setting a destination address according to a logical address system independent of the system and a source address according to an address system of the second system so that the second system transmits a frame to the first system step; And converting, from the matching device, the source address into a logical address for a frame transmitted from the second system, converting the destination address according to the address system of the first system, and transmitting the converted address to the first system. It includes 4 steps.

In addition, the present invention, after generating a frame according to the handoff request in the high-capacity processor, the destination system in the first system is set according to a logical address system independent of the system, and the source address is the address of the first system A first step of setting and transmitting according to the scheme; And converts the source address into a logical address system for a frame transmitted from the first system in a second system of a different type from the first system and a matching device located between the first system, and converts the destination address into the system. A second step of converting the address system according to an address system of the second system and transmitting the converted address to the second system; A third system for setting a destination address according to a logical address system independent of the system and a source address according to an address system of the second system so that the second system transmits a frame to the first system step; And converting, from the matching device, the source address into a logical address for a frame transmitted from the second system, converting the destination address according to the address system of the first system, and transmitting the converted address to the first system. A computer readable recording medium having recorded thereon a program for executing step 4 is provided.

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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.

1 is a view for explaining a data transmission process between heterogeneous systems to which the present invention is applied.

To implement soft handoff, there must be a physical device that can send and receive frames between systems of different manufacturers or manufacturing methods. To this end, the present invention uses an Asynchronous Transmit Method (ATM) switch 101.

The ATM matching modules 104 and 105 in the MSC of each system have an E1 or T1 match to the ATM switch 101, and all the frames to the other MSCs are ATM matching modules 104 and 105. ) Is sent to the ATM switch 101.

In the ATM switch 101, the frame is received through the system matching modules 102 and 103 having the E1 / T1 match with the mobile switch of each system, and the ATM matching module 104 or 105 of the mobile switching center (MSC) belonging to another system again. The frame is sent to a specific channel such as a traffic channel of a base station (BS) connected to a mobile switching center (MSC) of another system or a vocoder channel of a base station control station (BSC).

There is a need for a new addressing system for heterogeneous systems using different addressing systems in the transmission of such frames. The new addressing system is configured to be sent to the upper network ATM network in each system, and configured to be changed to the addressing system of the system to be sent by the system matching modules 102 and 103 of the ATM switch 101. . In addition, when each system has a different frame structure, when a frame is transmitted from one system to another system, the conversion thereof is configured to be performed by the system matching modules 102 and 103 of the ATM switch 101.

2A and 2B are exemplary diagrams illustrating a logical address of a frame for handoff between heterogeneous systems according to the present invention.

Since the configuration is different for each system, a logical address system in consideration of scalability can be used as shown in the figure. Each frame is a traffic channel of a base station BS of another system in a vocoder channel (a portion of the base station control station responsible for digital encoding and decoding of voice) of a base station control station (BSC) in a call state as shown in FIG. 2A. (Traffic Channel: vocoder of base station control station (BSC) belonging to another system in the traffic channel of base station (BS) when it is sent to a part of base station which transmits the created voice frame to mobile station through spread spectrum) There are two cases where it is sent on a channel. Each case uses a different frame to represent each case in the system.

2A is an exemplary diagram of logical addressing of a frame sent on a traffic channel.

First, in order to indicate the address of the receiving side of the frame sent to the traffic channel, the base station control station number, base station number, frequency assignment (FA) number, sector number, and traffic channel number of the corresponding system are required. This can be represented using the addressing scheme of the uplink (link for being sent to another system through an ATM switch inside the system) of FIG. 2A.

The logical addressing system of the frame sent to the traffic channel is a 1-bit frame division zone 201 that distinguishes whether the frame goes to the traffic channel or the frame to the vocoder channel, and the base station control station number of 0-11 using 4 bits. A base station control station number zone 202 indicating a base station, a base station number zone 203 indicating a base station number from 0 to 59 using 6 bits, and a frequency assignment of 0 to 7 using 3 bits (FA) A frequency allocation number zone 204 representing a number, a sector division zone 205 dividing a sector into three of alpha, beta, and gamma using 2 bits, and traffic representing a traffic channel from 0 to 31 using 5 bits. A channel number zone 209, a channel card division zone 210 for classifying channel card types using 3 bits, and a base station control station (BSC) and a geographically separated base station (BS) using 4 bits Several E1 Or a link number zone 208 for dividing a link of T1, and reserved zones 206 and 207 for indicating a reserved area for each system.

Figure 2b is an example of the logical address system of the frame sent to the vocoder channel.

When a frame is sent from the traffic channel of the base station to the vocoder channel of the base station control station in another system, the base station control station number and the number of the vocoder channel in the system should be indicated to indicate the vocoder channel in the system. This can be represented using the addressing scheme of the uplink vocoder channel of FIG. 2B.

The logical addressing system of a frame sent to the vocoder channel includes a frame division zone 211 for distinguishing whether a frame goes to a traffic channel or a frame for a vocoder channel using 1 bit, and a first reserved zone for use in each system. 212), a vocoder channel numbering zone 213 that indicates the number of vocoder channels from 0-2047 using 11 bits, a second reserved area 214 for the system, and a third reserved area 215 for the system. ), A link number zone 216 for distinguishing several E1 or T1 lines connecting a base station control station and a geographically separated base station using 4 bits, and a base station control station from 0 to 11 using 4 bits. A base station control station number zone 217 for indicating the number of s, a port number zone 218 for distinguishing A, B, and C ports in the vocoder channel using 2 bits, and a fourth reserved area 219 for the system It consists of 4 bytes of.

3 is a flowchart illustrating a process of establishing a logical address system of a frame for handoff between heterogeneous systems according to the present invention.

The logical address system of the frame is set for handoff between heterogeneous systems in accordance with the logical address system of the frame directed to the traffic channel and the vocoder channel.

Recipient address of the frame sent to the traffic channel, including frame division zone, base station control station number zone, base station number zone, frequency allocation number zone, sector classification zone, traffic channel number zone, channel card classification zone and link number zone In step 302, a receiver side address of a frame sent to the vocoder channel is set, including a frame division zone, vocoder channel number zone, link number zone, base station control station number zone, and port number zone.

Frames sent using the logical addressing system described above through the ATM network are converted by the ATM matching module 104 and 105 into a logical addressing system of the system. In addition, the contents of traffic frames (frames that send and receive the actual encoded voice signals) also differ only in their order, and thus have the same configuration.

4 is an exemplary frame configuration of a general form used for transmission and reception in each system to which the present invention is applied.

A relative address area 401 indicating an address of a destination, a self address area 402 indicating an address of a destination, and a traffic frame content part 403 carrying content of a frame are included. The own address area 402 is a value that is fixedly written down according to the system's address system in the system to which the frame is to be transmitted, and the relative address area 401 is an area in which the system can arbitrarily create an address of the other party.

5 is a flowchart illustrating a data transmission method for performing soft handoff between heterogeneous mobile communication systems according to the present invention.

When transmitting a frame, the addressing method of its own address and the counterpart among the frame transmitting methods is performed as shown in FIG. 5. First, when trying to send a frame from system A to system B, the destination address is written in the relative address area according to the above-described logical address system setting method, and the address of the sending address is written in its own address area (System A). And transmits the frame according to the address system (501).

The frame arrives 502 through the ATM matching module 104 to the System A matching module 102 of the ATM switch. The ATM switch converts the address of system A in its own address area of the frame into a logical address system according to the logical address system setting method (503).

Inside the ATM switch, the frame is sent to the system B matching module 103 to send it to the counterpart B (504). The frame arriving at the system B matching module 103 converts the logical address system written in the relative address area in the system B matching module 103 according to the address system of the corresponding system (system B) (505). Frames entering the counterpart system (System B) through the ATM matching module 105 in the counterpart system are sent to the traffic channel of the base station BS or the vocoder channel of the base station control station BSC in the counterpart system (506).

On the contrary, in response to the received frame, first, the logical address system in the own address area of the received frame is written in the relative address area, and the address according to the address system of the system B is written in the own address area. The transfer will be performed.

Next, a soft handoff method using the same will be described.

In the soft handoff of a mobile station, the call processing procedure of each system should basically proceed without needing to distinguish whether or not the counterpart system is the same as its own, and should not affect the existing call processing flow.

Thus, for soft handoff proceeding from system A to system B, the control of the call is maintained by system A. Therefore, in order to receive the information of the new base station and other handoffs from the system B while maintaining the existing scheme without changing the call flow of the system A, the call from the system B needs to be modified. That is, the side having the control of the call (System A) is configured to eliminate the change on the call flow and instead to respond to the information request from the system A and the call channel allocation request from the system B that only lends the call channel in the system. At this time, since the messages related to the call channel allocation request and the information request to the counterpart systems are different for each system, appropriate conversion is performed by the system matching modules 102 and 103 of the ATM switch.

The system matching module of the ATM switch 101 has information about which system it is connected to, and looks at the frame coming from the system to distinguish whether the frame is traffic or a signal, and if the signal is a signal suitable for the counterpart system. Convert the frame.

On the other hand, if it is traffic, it translates the address and adjusts the frame structure to send the frame to the counterpart system.

6 is a flowchart illustrating a soft handoff method to which the present invention is applied.

Based on the above description, the flow of soft handoff that is applied to heterogeneous products having different manufacturers or manufacturing methods is as shown in FIG. 6. First, a new propagation signal (signal with a new Pseudo Random Noise (PN) Offset) is T_ADD (a parameter used in handoff). Mobile station sends a pilot strength measurement report message to the call control processor (CCP) in the base station control station (BSC) of system A through the vocoder channel of the base station control station (BSC). (601).

At this time, the call control processor (CCP) of system A is a call control processor (CCP) of the system B to which the radio wave belongs according to the neighboring radio wave information it has, a handoff request signal requesting new channel allocation and information about the radio wave. Will be sent (602). At this time, the signal is sent to the system B via the ATM switch 101, wherein the signal according to the system A method is converted into a signal according to the system B method.

The call control processor (CCP) of the system B receiving the signal allocates a new channel through the traffic channel of the base station (603, 604), and provides the channel assignment result and information to the call control processor (CCP) of the system A. Send an off request response signal (605). The call control processor (CCP) of the system A receives the handoff progress signal for handoff to the base station control station (BSC) (606) and the base station control station of the system A refers to the traffic of the base station of the system B by referring to the signal. A time synchronization frame (a type of traffic frame for synchronizing time) is sent to the channel (607).

At this time, the information about the traffic channel of the base station of the system B was initially transmitted from the system B to the logical address system according to the method of setting the logical address system and transmitted to the system A. It has an address area. This time synchronization frame is sent through the ATM matching module to the system A matching module of the ATM switch, where address translation is performed according to the aforementioned communication protocol application method. Upon receiving the time synchronization frame, the base station BS of the system B sends a time synchronization response frame in response thereto (608), where the relative address area of the system A is already aware of the logical address system.

In this way, handoff is performed by sending and receiving traffic frames through ATM switches between System A and System B.

In reality, each system has a similar flow, but it is reconfigured according to the characteristics of each system. Accordingly, different systems have different handoff procedures, and the present invention can adapt different communication schemes for each system.

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 skill.

The present invention as described above, in the code division multiple access (CDMA) wireless communication system to implement a frame created according to a logical address system independent of the system to implement a soft handoff between systems with different manufacturers or manufacturing methods By converting between the exchanges to the address system used in the system, the handoff success rate is higher than that of the existing hard handoff, and by implementing soft handoff between systems with different manufacturers or manufacturing methods. It is possible to provide higher quality communication service, and further reduce the load of message transmission and reception during the exchange period for hard handoff between system boundaries.

Claims (18)

delete In the data transmission method for soft handoff between heterogeneous mobile communication systems of different manufacturers or manufacturing methods, After generating the frame according to the handoff request, the first step of setting the destination address in accordance with the logical address system irrespective of the system, the source address is set according to the address system of the first system and transmitted ; And converts the source address into a logical address system for a frame transmitted from the first system in a second system of a different type from the first system and a matching device located between the first system, and converts the destination address into the system. A second step of converting the address system according to an address system of the second system and transmitting the converted address to the second system; A third system for setting a destination address according to a logical address system independent of the system and a source address according to an address system of the second system so that the second system transmits a frame to the first system step; And A fourth device for converting the source address into a logical address system for the frame transmitted from the second system and converting the destination address according to the address system of the first system in the matching device to transmit to the first system step Data transmission method between heterogeneous mobile communication systems for soft handoff, comprising a. The method of claim 2, A fifth step of, after the base station control station of the first system receives the handoff request response signal from the second system, transmitting a time synchronization frame to the base station of the second system; And And a sixth step of transmitting, by the base station of the second system, the time synchronization response frame to the base station control station of the first system. The method of claim 2 or 3, The matching device is a data transmission method between heterogeneous mobile communication systems for soft handoff, characterized in that it comprises an asynchronous transfer mode (ATM) switch. The method of claim 3, wherein In the fifth step, the frame transmitted from the base station control station of the first system to the base station of the second system, Frame classification information for distinguishing whether a frame goes to a traffic channel or a frame for a vocoder channel, a base station control station number indicating a base station control station number, a base station number indicating a base station number, frequency allocation number, sector classification information, traffic channel number, channel Card type information, and a link number for distinguishing the link connecting the base station control station and the geographically separated base station, the data transmission method between heterogeneous mobile communication systems for soft handoff. The method of claim 3, wherein In the sixth step, the frame transmitted from the base station of the second system to the base station control station of the first system, Frame classification information to identify whether the frame is going to the traffic channel or the frame to the vocoder channel, the vocoder channel number indicating the vocoder channel number, the link number separating the link connecting the base station controller and the geographically separated base station, and the base station. A method for transmitting data between heterogeneous mobile communication systems for soft handoff, comprising a control station number and a port number for distinguishing ports in a vocoder channel. delete delete delete delete delete delete delete delete delete delete On a large processor, After generating the frame according to the handoff request, the first step of setting the destination address in accordance with the logical address system irrespective of the system, the source address is set according to the address system of the first system and transmitted ; And converts the source address into a logical address system for a frame transmitted from the first system in a second system of a different type from the first system and a matching device located between the first system, and converts the destination address into the system. A second step of converting the address system according to an address system of the second system and transmitting the converted address to the second system; A third system for setting a destination address according to a logical address system independent of the system and a source address according to an address system of the second system so that the second system transmits a frame to the first system step; And A fourth device for converting the source address into a logical address system for the frame transmitted from the second system and converting the destination address according to the address system of the first system in the matching device to transmit to the first system step A computer-readable recording medium having recorded thereon a program for executing the program. delete

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