KR20000061770A - Method for making protocol in future cdma - Google Patents

Abstract

PURPOSE: A method for embodying a protocol of a next generation mobile communication network is provided to maintain the reliability requested in the next generation mobile communication network for adopting a non-synchronous transmission method by providing the reliability of a signal message transmission in a conventional level and removing a SCCP and a MTP3d. CONSTITUTION: A transmitting unit sets a port for composing a physical layer through information regarding to a port provided from the physical layer(510). The transmitting unit monitors as to whether a message for requesting a transmission is received from an IS-634 layer corresponding to an upper layer(512). The transmitting unit performs a process to a received message when a receipt of the message from the IS-634 layer is sensed(514). If a connection to be an idle state is selected or a previously registered connection is selected, the transmitting unit transmits a message to the selected connection(516).

Description

Protocol implementation method of next generation mobile communication network {METHOD FOR MAKING PROTOCOL IN FUTURE CDMA}

The present invention relates to a method for implementing a protocol in a next generation mobile communication network, and more particularly, to a method for implementing a protocol required in a next generation mobile communication network in order to apply an asynchronous transmission method.

In general, a wireless switching system includes various kinds of additional services including a call service such as switching a wireless terminal (for example, a CDMA terminal, a PCS terminal, etc.) to form a call route through a wired terminal via a wired local exchange or the same wireless terminal. Means an exchange system that provides services. Such a wireless switching system basically consists of a mobile station, a base station controller (BSC) and a mobile switching center (MSC) to perform a function for providing a mobile telephone service through a mobile terminal.

An example thereof may be a North American second generation mobile communication network.

In general, the North American second generation mobile communication network uses SS7 (MTP, SSCP) and IS-634 as a protocol for communication between a mobile switching center (MSC) and a BSC. The IS-634 is a layer 3 protocol used for Call, Mobility, and Authenfiaction control between the MSC and the BSC, and the SS7 is a protocol adopted for the reliable transmission of IS-634 messages.

The protocol stack configuration of the BSC and the MSC constituting the second generation mobile communication network of the synchronous transmission method described above will be briefly described with reference to FIG. 2. The protocol stacks of the BSC and the MSC include an L3 layer and an SCCP layer. SCCP Layer, MTP3 Layer, MTP2 Layer and MTP1 Layer.

In the second generation mobile communication network having the protocol stack configuration as described above, the SCCP layer and the MTP layer used between MSC-MSC, MSC-HLR, and MSC-PSTN in the network for reliable transmission of L3 layer messages are also used between MSC-BSC. Used.

In terms of reliability, SCCP performs an end to end reliability procedure (error control, flow control scheme), and in MTP2, node to node reliability procedure (error control, flow) Perform a control scheme.

However, thanks to the development of industrial technology, the field of information and communication is becoming more and more personalized, leading to the situation of supporting multimedia in a personal portable communication system.

Therefore, what has evolved from the second generation mobile communication network is 'IMT-2000', a third generation mobile communication network that is now called the next generation mobile communication network, and the protocol standard work for service is carried out by the International Standards Organization (ITU-T) or the like. It is becoming.

On the other hand, as evolved into the next generation mobile communication network capable of processing not only voice, but also image and data, the transmission method between MSC and BSC should be newly defined, and the transmission method is not only synchronous (STM) but also asynchronous (ATM). There is a tendency.

In this case, when the asynchronous transmission scheme is adopted, there is a problem in applying the SS7 for the synchronous transmission scheme adopted in the second generation mobile communication network to the asynchronous transmission scheme.

That is, the asynchronous transmission method itself has a procedure for the reliable transmission of the message. If the reliability of the message transmission is ensured using the SS7, duplication of a protocol stack may occur, which may take a long time.

That is, the protocol stack of the BSC and the MSC constituting the next-generation mobile communication network of the asynchronous transmission method described above will be briefly described with reference to FIG. 3, and the protocol stack of the BSC and the MSC is an IS-634 layer (IS-634 Layer). ), An SCCP layer, an MTP3b layer, an SSCOP layer, an AAL5 layer, an ATM layer, and a physical layer.

In the next generation mobile network adopting the asynchronous transmission scheme having the protocol stack configuration as described above, the SCCP layer and the MTP3b layer used in the second generation mobile communication network for signaling messages between MSC-BSC are adopted. However, if there is a difference, it can be seen that the lower part of the MTP3b layer is not the MTP2 layer and the MTP1 layer but the protocols suitable for the characteristics of the asynchronous transmission method.

Accordingly, as can be seen from the foregoing, the following problems exist when implementing a next-generation mobile communication network using the conventional asynchronous transmission method.

First, the protocol stack between MSC and BSC of next generation mobile communication network adopting asynchronous transmission method has two more protocols to pass layer 3 message than the existing second generation synchronous protocol stack. In other words, this means that a processing time for sending a message is long and the overhead for sending a message is large. That is, each protocol attaches its head and tail to a message, so the ratio of overhead to actual data is high. It results in raising the network usage expenses for sending messages.

Second, the MSC and BSC protocol stacks of the next-generation mobile communication network adopting the asynchronous transmission method perform reliability control (error control, flow control scheme) in both SCCP and SSCOP. It has a large overhead in message processing time compared to the rate of increase in reliability. Unlike the past, nowadays, the error rate of transmission line is almost 0%, and the reliability control (error control, flow control scheme) of SSCOP protocol is very good. As an example of the error rate of the transmission line, the transmission error rate of the optical cable is 1 × 10 ⁻⁹ or less. For this reason, the SCCP reliability procedure is unnecessary because it only increases the processing time for message processing.

Accordingly, an object of the present invention for solving the above problems is to provide a protocol of the next generation mobile communication network that eliminates the duplicated protocol stack in the asynchronous transmission method.

Another object of the present invention is to provide a protocol of a next-generation mobile communication network that eliminates the overhead of message processing.

Another object of the present invention is to provide a protocol for transmitting and receiving connectionless messages in a mobile communication network of asynchronous transmission method.

Another object of the present invention is to provide a protocol for transmitting and receiving a connection-oriented message in an asynchronous transmission mobile communication network.

It is still another object of the present invention to provide a protocol according to virtual path / virtual channel allocation and release in an asynchronous transmission mobile communication network.

The present invention for achieving the object as described above in the implementation of a mobile communication network in accordance with the asynchronous transmission method in the protocol stack of the protocol stack according to the asynchronous transmission method and the protocol stack of the second generation mobile communication network, In the OOP layer, the protocol of the next generation mobile communication network is implemented to perform the protocol according to the allocation and release of the virtual path / virtual channel required for the asynchronous transmission method, and the protocol for connection-oriented message and connectionless message transmission.

1 is a diagram illustrating a configuration of a typical mobile communication network.

2 is a diagram illustrating a protocol stack configuration in a second generation mobile communication network of a conventional synchronous transmission method.

3 is a diagram illustrating a protocol stack configuration in a next-generation mobile communication network of a conventional asynchronous transmission method.

4 is a diagram illustrating a protocol stack configuration in a next generation mobile communication network in an asynchronous transmission mode according to an embodiment of the present invention.

5 is a diagram illustrating a control flow processed by a transmitter of an SOS layer according to an embodiment of the present invention.

6 is a diagram illustrating a control flow processed by a receiver of an SOS layer according to an embodiment of the present invention.

7 is a diagram illustrating a processing flow for virtual path / virtual channel allocation according to an embodiment of the present invention.

8 is a diagram illustrating a processing flow for releasing a virtual path / virtual channel according to an embodiment of the present invention.

9 is a diagram illustrating a processing flow for transmitting and receiving a connection-oriented message according to an embodiment of the present invention.

10 is a diagram illustrating a processing flow for transmitting and receiving a connectionless message according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings by a preferred embodiment of the present invention will be described.

First, prior to describing a preferred embodiment according to the present invention, it should be noted that the same components and messages in the accompanying drawings according to an embodiment of the present invention represent the same reference numerals and terms wherever possible. Reveal in advance.

First, the configuration of a typical mobile communication network to which the present invention is applied is disclosed in FIG. 1, and the configuration of a typical mobile communication network will now be described with reference to FIG. 1.

As shown in FIG. 1, the mobile communication network includes a BTS for performing wireless communication with a mobile terminal in an allocated cell and at least one BTS for switching, handover, and the like. It consists of a BSC to perform and an MSC that accepts at least one BSC and performs functions such as routing and PSTN access.

Meanwhile, in the present invention, in applying an asynchronous transmission method (ATM), various types of information such as voice and data are processed using an ATM cell between the BSC and the MSC. That is, the BSC assembles various information such as voice and data provided from the BTS into an ATM cell, and transmits the information to the MSC. The BSC decomposes the ATM cell provided from the MSC and provides the BTS to the BTS.

Each of the above configurations has a protocol stack for performing unique functions, which is typically defined by the standard. The standard work is being done by Europe, Japan and the United States, but it will be difficult to establish a unified standard.

As described above, the present invention is to implement a protocol stack required for transmitting a message between a BSC and an MSC among protocol stacks of each component constituting a mobile communication network.

As a result, the protocol stacks of the BSC and the MSC constituting the next-generation mobile communication network of the proposed asynchronous transmission method are shown in FIG.

The protocol stack illustrated in FIG. 4 may be referred to as a configuration that eliminates overlapping protocol stacks and overheads among the protocol stacks proposed by the next generation mobile communication network adopting the conventional asynchronous transmission method. In other words, unlike the existing method, the protocol of the SCCP layer and the MTP3b layer is deleted and the IS-634 layer message is directly sent to the SSCOP layer.

Referring to FIG. 4, the protocol stack structure of the BSC and the MSC constituting the next generation mobile communication network of the asynchronous transmission method according to an embodiment of the present invention, the protocol stack of the BSC and MSC is IS-634 layer (IS- 634 Layer), SCCP Layer (Service Cpecific Connection-oriented Protocol Layer), AAL5 Layer (AAL5 Layer), ATM Layer (ATM Layer) and Physical Layer (PHY Layer).

On the other hand, the present invention has little effect on each protocol present on the protocol stack. However, the SSCOP layer of the protocol stack according to the present invention is located between an IS-634 layer and an AAL5 layer, which is a SCCP layer and an MTP3b layer which process information. ), It should be able to collectively perform the functions of the SSCOP layer.

Accordingly, the SSCOP layer shown in FIG. 4 can be largely divided into a transmitter and a receiver, and the transmitter and the receiver perform operations according to their own control flows according to the application of the present invention.

An example of the control flow performed by the transmitter and the receiver may be illustrated in FIGS. 5 and 6.

5 is a diagram illustrating a control flow processed by the transmitter according to the application of the present invention, and FIG. 6 is a diagram illustrating a control flow processed by the receiver according to the application of the present invention.

Referring briefly to the control flow disclosed in FIG. 5, if a message is received from a higher layer (IS-634 layer) after establishing a connection of a physical layer port at initialization, the message is processed to be in an idle state. It consists of sending a message over a connection.

On the other hand, the control flow disclosed in FIG. 6 will be briefly described. If a message is received from a lower layer (AAL5 layer) after establishing a connection of a physical layer port at initialization, the message is registered and the connection is received. The received message is transmitted to a higher layer (IS-634 layer).

In addition, as mentioned above, in order to implement the present invention, an interface between the IS-634 layer and the SSCOP layer is required. The main functions of the interface include the assignment and release of virtual paths / virtual channels (VPI / VCI), transmission and reception of Connection-Oriented IS-634 Message and ConnectionLess IS-634 Message. have.

An example of a processing flow for virtual path / virtual channel allocation and release according to an embodiment of the present invention is illustrated in FIGS. 7 and 8, and one of the processing flow for transmitting and receiving a connection-oriented message. An example is shown in FIG. Lastly, an example of a processing flow for transmitting and receiving a ConnectionLess message according to an embodiment of the present invention is illustrated in FIG. 10.

The connection orientation refers to a form of data transmission using a virtual line in data communication, and the connection lease refers to a form of data communication without using a virtual line in data communication.

Hereinafter, a preferred operation according to an embodiment of the present invention with reference to the configuration as described above in detail as follows. First, an operation according to an embodiment of the present invention will be described based on the SSCOP layer as described above. In addition, the upper layer described in describing the operation according to an embodiment of the present invention refers to the IS-634 layer that is the upper layer of the SSCOP layer as the subject, and the lower layer is the AAL 5 layer that is the lower layer of the subject SSCOP layer. Means.

First, the operation according to the processing of the SSCOP layer transmitter will be described in detail with reference to FIG. 5. In step 510, the transmitter sets a port constituting the physical layer through information about a port provided by the physical layer. do. In general, when the asynchronous transmission scheme is applied, the ports constituting the physical layer are configured with 256 connections, which are expressed as virtual paths (VPIs) / virtual channels (VCIs), and VPI = 0 to 256 / VCI = 5. Can be displayed as

When the setting is completed, the transmitter proceeds to step 512 to monitor whether there is a message for requesting transmission from the IS-634 layer corresponding to the upper layer. In step 512, if the reception of the message from the IS-634 layer is detected, the transmitter proceeds to step 514.

In step 514, the transmitter performs processing on the received message. The processing may include a reliability procedure for transmission and the like. In addition, while processing the message, the transmitter checks the connection established in step 510 and selects a connection currently in an idle state. The selection of the idle state may include a bit indicating whether the connection is in use in response to each connection established in step 510, and when the message is received, the idle state may be determined by searching for the bit. In this case, the connection means that the VPI / VCI to be transmitted is determined and becomes a value that can be displayed as VPI / VCI. In addition, when the new connection is selected, the transmitter sets a bit for notifying that the selected connection is in use, and then registers the selected connection (VPI / VCI value) corresponding to Id of the IS-634 layer where the message is received. Processing of the message received over the selected connection is performed.

However, if it is determined that the message to be transmitted is not a message requesting transmission according to a new connection but a case in which the connection is already registered and the message is already being transmitted, the transmitter does not select the idle connection described above. . In other words, since a new connection is not necessary since a connection is already established, in this case, a connection that is already registered is selected. Selecting the registered connection means reading the registered connection (VPI / VCI value) corresponding to Id of the IS-634 layer where the message is received.

In step 514, if a connection in idle state is selected or an already registered connection is selected, the transmitter proceeds to step 516 to transmit a message to the selected connection. The transmission of the message is a concept of transmitting the VPI / VCI of the connection selected in step 514 on the header information of the message to be transmitted.

On the other hand, when the transmission of the message is completed, the transmitter proceeds to step 512 and is always maintained in a state capable of processing a newly received message.

Secondly, the operation according to the processing of the SSCOP layer receiving unit will be described in detail with reference to FIG. 5. In step 610, the receiving unit sets a port constituting the physical layer through information about a port provided by the physical layer. do. As described in the operation of the transmitter of FIG. 5, in general, when the asynchronous transmission scheme is applied, the ports constituting the physical layer are configured with 256 connections, which is a virtual path (VPI) / virtual channel (VCI). ), It can be expressed as VPI = 0 to 256 / VCI = 5.

When the setting is completed, the receiver proceeds to step 612 to monitor whether there is a message received from the AAL5 layer corresponding to the lower layer. If the reception of the message from the AAL5 layer is detected in step 612, the receiver proceeds to step 614.

In step 614, the receiver registers the connection in which the message is received in response to the ID of the IS-634 layer to which the message is to be transmitted, thereby providing the message received through the registered connection to the ID of the IS-634 layer. To make it possible. At this time, it will be apparent that the ID of the IS-634 layer to provide a message should be registered in the received message.

However, although not disclosed in FIG. 6, if the received message is received through an already registered connection, it may not be necessary to register the received connection in step 614.

In step 614, if the registration of the connection in which the message is received is completed or the connection in which the received message is already registered, the receiver proceeds to step 616. In step 616, the receiver determines the Id of the IS-634 layer to provide the received message and provides the message to the determined Id. If the received message is received over an idle connection, the provision of the message will be provided to the Id of the newly registered IS-634 layer; otherwise, for a message received over an already registered connection, registration The Id of the IS-634 layer is read and provided to the IS-634 layer having the read Id.

On the other hand, when the transmission of the message is completed, the transmitter proceeds to step 612 and is always maintained in a state capable of processing a newly received message.

Third, operations according to VPI / VCI allocation / release, connection oriented message transmission, and connectionless message transmission / reception corresponding to specific functions of the transmitter and receiver of the SSCOP layer will be described in detail. In this case, when the transmitting side is the BSC, the MSC becomes the receiving side, and when the transmitting side is the MSC, the BSC becomes the receiving side. In the following operation description, the BSC and the MSC are not distinguished. Explain.

First, in VPI / VCI allocation, the operation will be described assuming that the configuration of 710 shown in FIG. 7 is a transmitting side for requesting VPI / VCI allocation, and the configuration of 720 is a receiving side for allocating VPI / VCI by request.

The IS-634 layer constituting the transmitting side 710 generates a connection allocation request (AAL-Establish-Request) in step 1 when a situation in which a connection to the receiving side 720 is required occurs, such as a message to be transmitted. Done. The connection allocation request means an allocation of VPI / VCI used in the asynchronous transmission method, and is a command for requesting a new connection establishment. The connection assignment request also includes the Id (IS-634 identifier) of the IS-634 layer that made the request.

Upon receiving the connection allocation request including the Id, the transmitting side 710 SSCOP layer occupies the VPI / VCI currently in the idle state in response to the request through a memory table search. The process of selecting the VPI / VCI in the idle state may be referred to as the process 514 described above with reference to FIG. 5.

An example of a memory table required for the VPI / VCI search may be shown as in Table 1 below.

index VPI / VCI Whether or not to use One VPI = 0 / VCI = 5 One 2 VPI = 1 / VCI = 5 0 … n VPI = 255 / VCI = 5 One

Looking at the selection of the VPI / VCI with reference to <Table 1>, the transmitter 710 checks the value of the use area of the memory table having the form of <Table 1> by the connection allocation request. In this case, the usage area means an area for registering a value for designating whether to use the VPI / VCI set at the time of initialization. In Table 1, '1' is used as a value of a usable area corresponding to a VPI / VCI in use, and '0' is used as a value of a usable area corresponding to a VPI / VCI in an idle state. Therefore, if referring to <Table 1>, the transmitter 710 will designate 'VPI = 1 / VCI = 5' in the idle state as VPI / VCI. Meanwhile, when the designation is completed, 'VPI = 1 / VCI = 5' can no longer be selected by setting '1' indicating that the designated area is in use in the use area corresponding to the designated 'VPI = 1 / VCI = 5'. something to do.

When the selection of the VPI / VCI is completed in step 2, the SSCOP layer registers the occupied VPI / VCI in a mapping table by mapping to the received Id in step 3.

As described above, an example of a mapping table that registers a VPI / VCI in response to IS-634 Id to allocate a VPI / VCI for transmitting a message received from a higher layer is shown below. Is the same as

index IS-634 Identifier VCI / VPI One Id 1 VPI = 0 / VCI = 5 2 … n Id n VPI = 3 / VCI = 5

As can be inferred from Table 2, the transmitting unit 710 receives a connection allocation request from the IS-634 layer having an identifier of Id 1 in step 1 and selects 'VPI = 0 / VCI = 5' in step 2. After selecting and occupying the VPI / VCI, it can be seen that 'VPI = 0 / VCO = 5', which was occupied in step 3, is registered in the mapping table corresponding to Id 1, which is an Id of the IS-634 layer that has requested AAL allocation.

When the mapping table registration is completed in step 3, the transmitter 710 transmits a connection request protocol data unit (BGN PDU) for allocating the VPI / VCI of the receiver 720 using the occupied VPI / VCI in step 4. Send it. Although not shown in the figure, the transmission of the BGN PDU will be transmitted to the receiving side 720 via the AAL 5 layer, the ATM layer, and the PHY layer corresponding to the lower layer shown in FIG. 4. The transmission path is not shown because it is not only mentioned in the prior art but also corresponds to a known technique.

The 'BGN PDU' transmitted from the transmitting unit of the transmitting side 710 SSCOP layer is provided to the receiving unit of the receiving side 720 SSCOP layer. The receiver of the receiving side 720 SSCOP layer that has received the 'BGN PDU' occupies the VPI / VCI to continuously receive and transmit a message through the VPI / VCI that has received the 'BGN PDU' in step 5. .

The detailed process of occupying the VPI / VCI overlaps with the process performed by the transmitter of the SSCOP layer included in the transmitter 710 described above using the memory table illustrated in Table 1, and thus detailed description thereof will be omitted. The only difference is that the SSCOP layer transmitter provided at the transmitting side 710 targets the idle state VPI / VCI occupied by Id, whereas the SSCOP layer receiver provided at the receiving side 712 has a 'BGN PDU'. Target VPI / VCI received.

Meanwhile, if the VPI / VCI is occupied, the receiving unit 720 of the SSCOP layer of the receiving side 720 informs the allocation approval request (AAL-Establish-Indicate) to inform the IS-634 layer corresponding to the higher layer in step 6. Provided by the IS-634 layer. At this time, the allocation approval request (AAL-Establish-Indicate) has a VPI / VCI value occupied in step 5.

In response to the designation, the IS-634 layer provides an allocation response (AAL-Estblish-Response) including its ID and the occupied VPI / VCI in step 7 to the transmitter of the SSCOP layer. In step 8, the transmitter of the SSCOP layer receiving the allocation response (AAL-Estblish-Response) registers the provided VPI / VCI by mapping the provided Id to a mapping table. The detailed process of registering the Id and the VPI / VCI in the mapping table is duplicated with the process performed by the transmitter of the SSCOP layer included in the transmitter 710 described above, and thus detailed description thereof will be omitted. On the other hand, VPI / VCI registration of the receiving side 720 SSCOP layer in step 8 is the same as the process performed in step 614 described with reference to FIG.

When registration of the Id and the VPI / VCI is completed in step 8, the transmitter of the SSCOP layer provided in the receiving side 720 performs step 9. In step 9, an acknowledgment protocol data unit (BGN Ack PDU) is transmitted to the receiver of the SSCOP layer provided at the transmitter 710 through the occupied VPI / VCI. The transmitted 'BGN Ack PDU' is an acknowledgment signal indicating that the allocation of the VPI / VCI is completed in response to the 'BGN PDU' transmitted in step 4 described above.

The receiving unit of the SSCOP layer provided in the transmitting side 710 that has received the 'BGN Ack PDU' sends a connection confirmation message (AAL-Establish-Confirm) to inform the IS-634 layer corresponding to the upper layer in step 10. Output The Id of the target IS-634 layer that outputs the connection confirmation message (AAL-Establish-Confirm) is determined by the mapping table illustrated as an example through Table 2 above.

Accordingly, the IS-634 layer confirms the allocation of the VPI / VCI for the transmission and reception of the message by the provided connection confirmation message (AAL-Establish-Confirm).

On the other hand, the operation of releasing the VPI / VCI allocated by the above operation is performed by the processing flow shown in FIG.

In more detail, when the IS-634 layer constituting the transmitting side 710 no longer needs a connection with the receiving side 720 as the transmission of the message is completed, the connection request in step 1 (AAL-Release- Request). The AAL-Release-Request includes an IS-634 Id (IS-634 Identifier) that makes the request, such as the AAL-Establish-Request described above with reference to FIG.

The transmitting unit of the SSCOP layer of the transmitting side 710 that receives the AAL-Release-Request including the Id is allocated to the receiving side 720 using the VPI / VCI occupied in step 2. Send an Release Protocol Data Unit (END PDU) to release the VCI. The occupied VPI / VCI is determined by detecting a VPI / VCI corresponding to Id provided in step 1 from the mapping table.

The receiving unit 720 of the receiving side 720 SSCOP layer that receives the release protocol data unit (END PDU) in step 2 returns the VPI / VCI currently occupied in step 3, and deletes the corresponding VPI / VCI and Id from the mapping table. do. The return of the VPI / VCI means changing the busy bit set in the use area of the memory table to a bit representing the idle state. This allows the returned VPI / VCI to be used by a new connection establishment request.

An example can be described with reference to Table 1 as described above. If a release request is made for the currently allocated connection 'VPI = 0 / VCI = 5', the example corresponds to 'VPI = 0 / VCI = 5'. VPI / VCI is returned by changing bit '1' set to '0' to '0'.

On the other hand, the VPI / VCI and IS-634 Id which are deleted from the mapping table having the configuration as shown in Table 2 above are the VPI / VCI and the VPI / to which the release protocol data unit (END PDU) is transmitted in step 2. It will be the Id corresponding to the VCI.

When the return of the VPI / VCI occupied in step 3 and the deletion of the VPI / VCI and Id registered in the mapping table are made, the receiving side 720 SSCOP layer disconnects from the step 4 to the higher layer IS-634 layer. The alert provides a release notification message (AAL-Release-Indicate).

In step 5, the acknowledgment protocol data unit for confirming the return of the VPI / VCI occupied by the release protocol data unit (END PDU) received in step 2 and the deletion of the VPI / VCI and Id registered in the mapping table ( END Ack PDU) is transmitted to a receiver of the SSCOP layer of the transmitting side 710.

Receiving unit of the SSCOP layer of the transmitting side 710 receiving the END Ack PDU in step 5 returns the VPI / VCI occupied in step 6, and the VPI / VCI and IS-634 in the mapping table. Delete the Id.

After the return of the occupied VPI / VCI in step 6 and the deletion of VPI / VCI and Id in the mapping table, in step 7, the receiver of the SSCOP layer releases a confirmation message to inform the IS-634 layer corresponding to the upper layer. AAL-Release-Confirm).

Accordingly, the IS-634 layer confirms the release of the VPI / VCI for sending and receiving the message by the provided release confirmation message (AAL-Release-Confirm).

Next, in transmitting and receiving the connection oriented message, the operation of the configuration shown in FIG. 9 is assumed to be a transmitting side for transmitting the connection orientation message, and 720 is a receiving side for receiving the connection orientation message. Explain.

First, prior to describing the operation according to an embodiment of the present invention, a conventional method will be described: a location request, a CM service request, a paging response, and an IS-634 layer. The same connection-oriented messages are sent and received via the CO primitive of the SCCP. Each is distinguished by a logical SRN and a DRN.

However, in the present invention, since the IS-634 message is directly transmitted through the SSCOP layer, the present invention does not use a source reference number (SRN) and a DRN, but instead transmits and receives a message using the VPI / VCI of the ATM layer. At this time, the VPI / VCI range that can be used for the IS-634 layer depends on whether to use a signaling area or a user area.

In the signaling area, up to 256 VPI / VCIs (0≤VPI≤255, VCI = 5) can be used per physical line (T1, E1, STM_1, etc.). Up to 256 x (65536-32) (0≤VPI≤255, 32≤VCI≤65535) can be used.

Meanwhile, as described above, before transmitting an IS-634 message, the primitives provided by the SCCOP layer (AAL-Establish-Request, AAL-Establish-Indicate, AAL-Establish-Response, AAL-Establish-Confirm) are used. Allocate VPI / VCI for sending IS-634 messages. The process of allocating the VPI / VCI has been described in detail with reference to FIG. 7.

After the VPI / VCI is allocated by the above-described process, the IS-634 message is exchanged using the Connection Oriented Message Request and the Data Oriented Message Indicate primitive.

In more detail, when there is a message to be transmitted, the IS-634 layer transmits a connection-oriented message transmission request (Data Request) including a message to be transmitted and its own unique ID in step 1.

The transmitted Connection Oriented Message Transmission Request (Data Request) is received by the transmitter of the SSCOP layer of the transmitter 710. The transmitter that receives the connection-oriented message transmission request (Data Request) searches for the VPI / VCI registered in the mapping table by using the ID included in the connection-oriented message transmission request (Data Request) received in step 2.

As the mapping table has an example configuration from Table 1 above, it will be obvious to search for a VPI / VCI corresponding to Id. When the VPI / VCI is determined in step 2, a protocol data unit (SD PDU) including a message to be transmitted through the determined VPI / VCI is configured and transmitted in step 3.

The transmitted protocol data unit (SD PDU) is input to the receiving unit of the SSCOP layer provided on the receiving side 720, and the receiving unit which receives the protocol data unit (SD PDU) in step 4 performs the protocol data unit (SD PDU). Determines the IS-634 Id to send the message to using the transmitted VPI / VCI. The determination of the IS-634 Id using the VPI / VCI is performed by the mapping table, which is a concept opposite to the operation of determining the VPI / VCI by the Id at the transmitting side 710. That is, this operation reads the Id designated corresponding to the VPI / VCI from the mapping table.

In step 4, if the Id of the IS-634 layer to which the IS-634 message is to be sent is determined, in step 5, the receiver determines the connection-oriented message reception notification (Data Indicate) including the IS-634 message. Transmission to the -634 layer completes the transmission of the IS-634 message.

In the case where all IS-634 messages are transmitted through the above process and the released VPI / VCI needs to be released, the connection allocated by the process described in detail with reference to FIG. 8 is released.

Finally, in the transmission and reception of the connectionless message, an operation will be described assuming that the configuration of 710 shown in FIG. 10 is a transmitting side for transmitting the connectionless message, and the configuration of 720 is a receiving side for receiving the connectionless message.

First of all, since it is not necessary to establish a connection in transmitting and receiving a connectionless message, it is noted that the operation according to the separate VPI / VCI allocation and release is not performed. That is, a series of operations for allocating or releasing a VPI / VCI connection described above with reference to FIGS. 7 and 8 are only processes required for transmitting a connection-oriented message, and in transmitting a connectionless message described below. It means that the above process is unnecessary.

Meanwhile, in the conventional method of transmitting and receiving a connectionless message, connectionless messages such as a paging request of the IS-634 layer are transmitted and received through the CL primitive of the SCCP.

However, the present invention uses the connectionless message transmission request (Unit Data Request) and the connectionless message reception unit (Unit Data Indicate) primitive of the SSCOP without setting the IS-634 message VPI / VCI.

In more detail, if there is a connectionless message to be transmitted, the IS-634 layer transmits a connectionless message transmission request (Unit Data Request) including an IS-634 message to be transmitted in step 1.

The transmitted connectionless message transmission request (Unit Data Request) is received by the transmitting unit of the SSCOP layer of the transmitting side 710, the transmitting unit receiving the connectionless message transmission request (Unit Data Request) in step 2 the connectionless The IS-634 message included in the unit data request is configured as a protocol data unit (UD PDU) and transmitted.

In this case, the VPI / VCI for transmitting the protocol data unit (UD PDU) is fixed at system initialization, so that all the protocol data units (UD PDU) are fixed VPI / VCI (eg, VPI = 0 / VCI = 5). Is sent using.

The transmitted protocol data unit (UD PDU) is received in the receiver of the receiving side 720 SSCOP layer, and the receiving unit provides it to the IS-634 layer in step 3. Transmission of the received IS-634 message to the IS-634 layer is performed by a connectionless message reception notification (Unit Data Indicate).

As described above, the present invention provides a light-weight protocol stack which eliminates duplication of a processing unit to guarantee reliability, and provides the reliability of signal message transmission at a conventional level, and has an effect of removing SCCP and MTP3d. As follows.

First, the reliability required in the next generation mobile communication network adopting the asynchronous transmission method can be maintained. Second, the message processing time can be reduced by eliminating the protocol stack of the two stages required in the conventional protocol stack.

In addition, third, it is possible to implement a reduction in the overhead (Head or Tail) for transmitting the actual signal message, and fourth, there is an advantage to improve the system development speed according to the reduction of the protocol step.

Claims (9)

In the protocol implementation method according to the connectionless message transmission of the next-generation mobile communication network using the S-COS layer having the upper layer IS-634, A connectionless message transmission process of transmitting a protocol data unit including the connectionless message through a fixed virtual path / virtual channel upon initialization upon receiving a connectionless message from the upper layer; And a connectionless message receiving process for providing a connectionless message included in a protocol data unit received through the fixed virtual path / virtual channel to the upper layer. Connection Orientation Message of Next-Generation Mobile Communication Networks Using SOSOP Layer with Mapping Table for Mapping Upper Layer and Assigned Virtual Path / Virtual Channel and Memory Table for Determining Use of Virtual Path / Virtual Channel In the protocol implementation method for transmitting the, Detecting a connection oriented message provided from a higher layer having a unique identifier, Selecting a virtual path / virtual channel mapped to the identifier from the mapping table when detecting the connection oriented message; Transmitting a protocol data unit including the connection oriented message to the selected virtual path / virtual channel; Detecting reception of the protocol data unit; When the reception of the protocol data unit is detected, selecting an identifier mapped to the virtual path / virtual channel received by the protocol data unit from the mapping table; And providing a connection-oriented message included in the protocol data unit to an upper layer of the selected identifier. A protocol implementation method according to virtual path / virtual channel allocation of a next generation mobile communication network using an S-COS layer having an upper layer of IS-634, Registering virtual paths / virtual channels corresponding to the connection forming the physical port in a memory table upon initialization; Detecting a connection allocation request input from an upper layer having a unique identifier, Checking a virtual path / virtual channel in an idle state among the virtual paths / virtual channels registered in the memory table when detecting the input of the connection allocation request; Occupying by setting a usage area corresponding to the virtual path / virtual channel of the memory table when the virtual path / virtual channel in the idle state is examined by the inspection; Registering in the mapping table such that the occupied virtual path / virtual channel and an identifier of the upper layer are mapped; Transmitting a connection request protocol data unit through the occupied virtual path / virtual channel; Detecting reception of the connection request protocol data unit; Occupying the connection request protocol data unit when the connection request protocol data unit is received by setting whether to use the mapping table corresponding to the received virtual path / virtual channel; Requesting approval of allocation to a higher layer after occupying the virtual path / virtual channel; Registering in the mapping table such that an identifier provided in response to the allocation approval request is mapped to the occupied virtual path / virtual channel; When the registration is made, transmitting a confirmation protocol data unit responsive to the connection request protocol data unit to the occupied virtual path / virtual channel; Detecting receipt of the acknowledgment protocol data unit; And detecting receipt of the acknowledgment protocol data unit by the acknowledgment protocol data unit by providing a connection confirmation message to the upper layer of the identifier selected from the mapping table by the received virtual path / virtual channel. Protocol implementation method of communication network. In the protocol implementation method according to the virtual path / virtual channel release of the next generation mobile communication network using the S-COS layer having the upper layer of IS-634, Detecting a disconnect request from an upper layer having a unique identifier, Transmitting a release request protocol unit to a virtual path / virtual channel mapped to the identifier by a mapping table when detecting the input of the connection release request; Detecting receipt of the release request protocol data unit; If the release request protocol data unit detects the reception of the release request protocol data unit, resetting a region of use of a memory table corresponding to the received virtual path / virtual channel to return the virtual path / virtual channel; Deleting an identifier mapped to the returned virtual path / virtual channel and the virtual path / virtual channel from the mapping table; When the deletion of the virtual path / virtual channel and the identifier is completed, informing that the connection to the upper layer of the deleted identifier is released; When the deletion of the virtual path / virtual channel and the identifier is completed, transmitting a confirmation protocol data unit to the deleted virtual path / virtual channel; Detecting receipt of the acknowledgment protocol data unit; When the acknowledgment protocol data unit is received, resetting the use or non-use area of the memory table corresponding to the received virtual path / virtual channel and returning the virtual path / virtual channel; Deleting an identifier mapped to the returned virtual path / virtual channel and the virtual path / virtual channel from the mapping table; And if the deletion is made, providing a release confirmation message to a higher layer of the deleted identifier. In the protocol implementation method according to the connection-oriented message transmission of the next-generation mobile communication network using the S-OS layer with the upper layer IS-634, An initialization process of setting virtual paths / virtual channels corresponding to a connection forming a physical port at initialization; Register the identifier and the idle virtual path / virtual channel in the mapping table according to a connection allocation request of a higher layer having a unique identifier, and then transmit a connection request protocol data unit to the registered virtual path / virtual channel, and confirm protocol data. A sender virtual path / virtual channel assignment process for providing a connection confirmation message to the upper layer by unit reception; A registration for registering the virtual path / virtual channel where the connection request protocol data unit is received with the identifier provided from an upper layer by an allocation approval request in the mapping table and then transmitting the acknowledgment protocol data unit to the virtual path / virtual channel Side virtual path / virtual channel allocation process, A connection-oriented message transmission process of transmitting a protocol data unit including the connection-oriented message to a virtual path / virtual channel selected from the mapping table by the identifier when a connection-oriented message is provided from an upper layer having a unique identifier; , Receiving a connection oriented message for providing a connection oriented message included in the protocol data unit to an upper layer of an identifier selected from the mapping table by a virtual path / virtual channel through which the protocol data unit is received; After transmitting a release protocol data unit to a virtual path / virtual channel selected from the mapping table by an identifier of a higher layer in which a connection release request is received, if a confirmation protocol data unit is received, the virtual path / virtual registered in the mapping table. A transmitting virtual path / virtual channel releasing process of deleting a channel and the identifier and providing a release confirmation message to the upper layer; Deleting the virtual path / virtual channel and the identifier of the mapping table by the virtual path / virtual channel where the release protocol data unit is received, transmitting the acknowledgment protocol data unit, and notifying release to the upper layer of the deleted identifier. A method for implementing a protocol of a next-generation mobile communication network, characterized in that the reception side virtual path / virtual channel release process is performed. The method of claim 5, wherein the transmitting virtual path / virtual channel allocation process comprises: Detecting a connection allocation request input from an upper layer having a unique identifier; Occupying the virtual path / virtual channel in the idle state among the virtual path / virtual channel set in the initialization process when detecting the input of the connection allocation request; Registering in the mapping table such that the occupied virtual path / virtual channel corresponds to an identifier of the upper layer; Transmitting a connection request protocol data unit over the occupied virtual path / virtual channel; Detecting receipt of an acknowledgment protocol data unit responsive to the connection request protocol data unit; And detecting a reception of the acknowledgment protocol data unit, providing a connection confirmation message to a higher layer of the registration identifier. The method of claim 6, wherein the receiving virtual path / virtual channel allocation process comprises: Detecting receipt of the connection request protocol data unit; Occupying the received virtual path / virtual channel by the connection request protocol data unit upon detecting reception of the connection request protocol data unit; Providing an allocation approval request to a higher layer after occupying the virtual path / virtual channel; Registering an identifier provided in response to the allocation approval request with the occupied virtual path / virtual channel in the mapping table; And if the registration is made, transmitting the identification protocol data unit to the occupied virtual path / virtual channel. The method of claim 7, wherein the transmitting virtual path / virtual channel release process, Detecting a disconnect request input from an upper layer having a unique identifier; Transmitting a disconnect request protocol data unit to the selected virtual path / virtual channel by selecting a virtual path / virtual channel from the mapping table by the identifier when detecting the input of the disconnect request; Detecting receipt of an acknowledgment protocol data unit responsive to the release request protocol unit; Deleting a virtual path / virtual channel and an identifier from the mapping table when detecting receipt of the acknowledgment protocol data unit; And if the deletion is made, providing a release confirmation message to an upper layer of the deleted identifier. The method of claim 8, wherein the receiving virtual path / virtual channel release process comprises: Detecting receipt of the release request protocol data unit; Deleting the virtual path / virtual channel and the identifier of the mapping table by the received virtual path / virtual channel when the release request protocol data unit is received; When the deletion of the virtual path / virtual channel and the identifier is completed, informing that the connection to the upper layer of the deleted identifier is released; And when the deletion of the virtual path / virtual channel and the identifier is completed, transmitting a confirmation protocol data unit to the deleted virtual path / virtual channel.