KR100209810B1 - Method for processing initial timer expires primitive for delay equalization protocol in isdn - Google Patents

Abstract

The present invention provides a high-speed initial timer termination (TCINIT_EXP) primitive processing at the originating terminal that starts at the first channel negotiation progress in the ISDN and terminates the timer when the initial negotiation progress between terminals is completed. The present invention relates to a method for processing an initial timer termination primitive, and to this end, when the initial channel negotiation between the calling terminal and the called terminal is completed, an initial timer ending primitive for terminating the ongoing initial timer according to the call setup start is delayed. Checking whether it occurs in an equalization negotiation control layer; Checking whether a state of a current channel to which a call is set is one of a plurality of preset channel states when an initial timer termination primitive is generated in a delay equalization negotiation control layer; When the state of the current channel is any one of a plurality of preset channel states, generating a message for disconnection of a set call while maintaining the current state of the current channel and transmitting the message to the called terminal; And starting the disconnect timer at the same time as the transmission of the disconnect message and transitioning the originating terminal to the call disconnection standby state.

Description

Initial Timer Termination Primitive Processing Method for Delay Equalization Protocol in Integrated Services Digital Network

The present invention relates to a delay equalization protocol used to bond a plurality of 56/64 kbit / s channels for broadband data transmission in an ISDN. Delay equalization by call control layer in DEQ protocol structure consisting of Call Control Layer, DEQ Negotiation Control Layer and DEQ Multiframe Control Layer A method suitable for handling the Initial Timer Termination (TCINIT EXP) primitive generated in the negotiation control layer.

As is well known, the Integrated Information Network (ISDN), which emerges to overcome the service limitations of individual networks that handle voice, video, and data separately, integrates each individual network and digitalizes each data to provide comprehensive services. to be. In such a comprehensive information communication network, an interface between a user and a network is currently standardized by a digital subscriber line signaling system (DSS 1) so as to adaptively accommodate various terminals. 7 Standardized to common line signaling (CCS).

That is, DSS 1, which is a signaling method of a user network interface (UNI), is implemented in multiple layers from layer 1 to layer 3 by an open intersystem interconnection (OSI) reference model, as shown in FIG. An overview of each of these layers and their relationship with the recommendations of the ITU-T is given in Table 1 below.

Hierarchy Feature Overview Recommendation Tier 1 Electrical, physical conditions I.430, I.431 Tier 2 Link establishment control, error control, etc. for message transmission Q.920, Q.921 Tier 3 Arc setting, opening, etc. Q.930, Q.931

Referring to FIG. 1, a first network terminal NT1 located in a house (or building) is connected to an ISDN exchange located in a telephone station through a subscriber line, and also an ISDN terminal (ET1) through an S / T point in a building. ) Or the second network terminal device NT2 is connected to the first network terminal device NT1.

Here, NT1 is a transceiver in a house for transmitting a digital signal to a subscriber line, NT2 is a device corresponding to a private branch exchange (PBX), can accommodate an ISDN terminal (TE1) at the station, TE1 is an ISDN standard terminal As a direct connection to NT1 or via NT2, TE2, which is an existing terminal having an ISDN corresponding function, is connected to an ISDN network through a terminal adapter (not shown).

In addition, the interface point between NT1 and NT2 is called T point, and the interface point between NT2 and TE1 is called S point. Since the interface specification of S point is determined to be based on T point, TE1 is connected to NT1. Is called the S / T point.

And subscriber-side terminals, such as ISDN terminals, are connected according to the protocols of Layer 1 to Layer 3 as described above, in order to be connected to the ISDN exchange. Recommendations for defining such connections are as described in Table 1 above.

In other words, in Table 1, Layer 1 is a user network interface of the physical layer recommended by ISDN Recommendations I.430 and I.431, and has a basic interface of 2B + D access and a primary group speed interface of 23B + D or 30B + D. In the basic interface, the frame structure is composed of 48 bits in units of 250 μm.

Layer 2, on the other hand, is commonly referred to as Link Access Procedure on the D channel (LAPD), which first adopts the BALANCE mode of HDLC, which is the standard of the standardized data link layer. It consists of an address field, a control field, an information field, and a frame check sequence (FCS).

Layer 3, on the other hand, controls the establishment, maintenance, and release of communication paths required for the circuit-switched and packet-switched services provided by the network, and various additional service requests. The message received from the other party is analyzed, call setup related messages are generated, and the generated messages are transmitted to the other party through the lower layer. The general content of this layer 3 is described in detail in Q.930, and call processing procedures for basic calls are recommended by Q.931.

Therefore, in implementing an ISDN terminal, the above-described functions must be implemented inevitably. In this case, the promise between the same layers is a "protocol", and the definition of a logical exchange between upper and lower layers is a "primitive". That is, each layer has entities that implement the functions of the layer, and these entities are configured to exchange information between upper and lower layers through primitives.

In addition, these primitives are divided into four types: REQUEST, INDICATE, RESPONSE, and CONFIRM. Most primitives related to data transfer are transferred from upper layer to lower layer. A request primitive and a display primitive transmitted from a lower layer to a higher layer. Here, the confirm primitive is a primitive that notifies the upper layer when the lower layer is obliged to respond to the specific request primitive from the higher layer, and the responding primitive is the higher primitive in relation to the specific request primitive from the lower layer. It is a primitive that informs the lower class when there is an obligation to respond.

Channels provided by ISDN include 64kbps “B” channel, 16kbps “D” channel, 34kbps “H0” channel and 2.048Mbps “H1” channel. The basic interface provided by the combination of these channels is It is defined as “2B + D” and the primary group interface is defined as 23B + D or 30B + D. In this case, when a wideband communication connection is required for a video service or the like in a narrowband ISDN, multiple (N) 56 or 64kbit / s channels may be used in combination. That is, if the basic interface or the primary group interface has a fixed bandwidth but various bandwidths are required according to a service, the ISDN network may provide an “N × 56/64 kbit / s” band.

However, in order to provide the “N × 56 / 64kbit / s” band as described above, bonding of 56 / 64kbit / s channels set independently of each other is required, where each 56 / 64kbit / s channel is used. Since they are individually connected by digital switching networks, there is a separate delay for each channel.

Thus, in multiplexing, one of the key technical details is related to delay equalization (DEQ), so to smoothly deliver 56/64 kbit / s, the DEQ protocol must be followed. In other words, the delay equalization protocol, also called a bonding protocol, is a protocol for equalizing delays generated between channels when N 56/64 kbit / s channels are combined, and the present invention provides such a delay equalization protocol. It is related to the improvement of.

Meanwhile, as shown in FIG. 2, the delay equalization protocol includes a call control layer 25, a delay equalization control layer 22, and a delay equalization multi-frame control layer DEQ. It consists of a Multiframe Control Layer (23) and transmits user data received from an APPLICATION Layer (21), and various primitives, as shown in FIG. In addition, the delay-equalized multi-frame control layer 23 is connected to a physical layer (not shown) through each channel control layer (24a-24c) and each physical medium dependent layer (PMDL Layer: 25a-25c) below. do.

Referring to FIG. 3, primitives transmitted from the call control layer 25 to the delayed equalization negotiation control layer 22 include DQ_INIT_REQ, DQ_DISC_REQ, DQ_DEL_CH__REQ, DQ_ADD_CH__REQ, DQ_ABORT__REQ, DQ_RL__REQ, DQ_LL__REQOFF, and DQ_LL_RE_OFF.

As addition, primitives from the delay equalizer negotiation control layer 22 is transferred to the call control layer (25) DQ_INIT_IND, DQ_DISC_IND, DQ_INIT_CONF, DQ_DEL_CH_CONF, DQ_DEL_CH_IND, DQ_DEL_CH_FAIL_IND, DQ_ADD_CH_IND, DQ_ADD_CH_CONF, DQ_ADD_CH_FAIL_IND, DQ_CID_FAIL_IND, DQ_LLOS_IND, DQ_RLOS_IND, DQ_ABORT_CONF, DQ_LL_IND, DQ_LL_OFF_IND, DQ_RL_IND, DQ_RL_OFF_IND, etc., and timers used in this layer include TCID_EXP, TCINIT_EXP, TAINIT_EXP, TANULL_EXP, TCADDO1_EXP, TAADDO1_EXP, TCDISC_EXP, and TADISC_EXP. Here, the present invention relates to the processing of TCINIT_EXP, which implies an initial timer end primitive.

Here, ×× _ ×××× _REQ indicates a request primitive, ×× _ ×××× _IND indicates a display primitive, ×× _ ×××× _RES indicates a response primitive, and ×× _ ×× ×× CFM represents the confirm primitive. CC_ ×××× _ ××× denotes a primitive transferred between the delay equalization negotiation control layer 22 and the delay equalization multiple frame control layer 23.

That is, primitives transmitted from the delay equalization negotiation control layer 22 to the delay equalization multiple frame control layer 23 include CC_ADD_REQ, CC_INFO_REQ, and CC_DEL_REQ. The timers used in the layer include TAFA_EXP and TXDEQ_EXP. Primitives transmitted from the frame control layer 23 to the delay equalization negotiation control layer 22 include CC_LSYNCH_IND, CC_RSYNCH_IND, CC_LSYNCH_FAIL_IND, CC_INFO_IND, CC_FAIL_IND, CC_LLOS_IND, CC_RLOS_IND, and the like. These primitives are described in detail in the Interoperation Specification for N × 56 / 64kbit / s (Version 1.1), issued by the Bonding Consortium, dated September 2, 1993.

On the other hand, the primitives defining the logical information are arranged between the upper and lower layers, for example, the call control layer 25 and the delay equalization negotiation control layer 22, the delay equalization negotiation control layer 22, and the delay equalization multiple frame control layer 23. When exchanging between upper and lower layers such as), the current state (i.e., mode) of a corresponding channel (i.e., a virtual channel) during processing of a specific primitive while a call is currently set up or in progress is set. First, check status such as NULL, CALL INIT, CALL INIT WAIT, AWAIT DN, ADDITIONAL CHANNEL, ACTIVE, etc. Next, the primitive received from the other layer (e.g., DQ_INIT_IND, DQ_DISC_IND, DQ_INIT_CONF, DQ_DEL_CH_CONF, etc.) or primitives generated by itself (e.g., TCID_EXP, TCINIT_EXP, TAINIT_EXP, TAINI_EXP, etc.) The processing routine is determined, and the primitive is processed according to the processing routine.

In particular, an initial timer termination (TCINIT_EXP) primitive used as a timer in the delayed equalization negotiation control layer 22 shown in FIG. 2 and started when negotiation proceeds for channel initialization is performed between each terminal (ie, a calling terminal (CU: calling). When the initial negotiation progress is completed in the unit and the answering unit (AU), that is, when the parameter negotiation and the directory number request are completed, the initial timer of the corresponding channel is terminated. That is, the current mode) is checked first, that is, the message according to each mode is analyzed / processed, and then the processing routine of the initial timer termination (TCINIT_EXP) primitive is determined according to the corresponding mode to process the corresponding primitive.

However, the conventional method as described above, considering that the processing is often similar or the same in different states of the channel for substantially the same primitive, the message according to each mode is analyzed / processed and then the corresponding primitive (i.e. By causing the initial timer termination (TCINIT_EXP) primitive), unnecessary code duplication occurs (i.e., an increase in the amount of code for message processing), and a code duplication using the subroutine call method (i.e. code It is not only difficult to construct an appropriately divided subroutine according to each mode (state) of the channel, but even if it is actually implemented, there is a problem that the processing speed is reduced according to the call procedure.

Accordingly, the present invention is to solve the above problems of the prior art, the initial start at the originating terminal side starting at the initial channel negotiation progress in the delay equalization protocol of the integrated information communication network and ending the timer when the initial negotiation progress between the terminals is completed It is an object of the present invention to provide a method for processing an initial timer end primitive capable of realizing a timer end (TCINIT_EXP) primitive processing at high speed.

In order to achieve the above object, the present invention has a hierarchical structure including a call control layer, a delay equalization negotiation control layer, and a delay equalization multi-frame control layer, and a calling terminal in a delay equalization protocol of a general information communication network combining multiple N channels. A method of processing an initial timer end primitive at an originating terminal that terminates an ongoing timer when an initial negotiation progress between an originating terminal and a called terminal is completed, when initial channel negotiation between the originating terminal and a called terminal is completed, according to a call setup start. A first step of checking whether an initial timer end primitive for terminating an ongoing initial timer is generated in the delay equalization negotiation control layer; A second step of checking whether a state of a current channel to which a call is set is one of a plurality of preset channel states when the initial timer end primitive is generated in the delay equalization negotiation control layer as a result of the check in the first step; A third step of generating a message for disconnection of the set call while maintaining the current state of the current channel when the state of the current channel is any one of the preset plurality of channel states and transmitting the message to the called terminal; And an initial timer termination primitive processing method for a delay equalization protocol in a comprehensive information communication network including a fourth process of starting a truncation timer at the same time as transmitting the truncation message and transitioning the originating terminal to a call truncation standby state.

1 is a schematic diagram illustrating a user network connection in an integrated information communication network (ISDN);

2 is a diagram showing a reference architecture of a delay equalization protocol according to the present invention;

FIG. 3 exemplarily shows primitives carried between three layers for implementation of a delay equalization protocol in ISDN; FIG.

4 exemplarily illustrates a frame structure commonly used in a delay equalization protocol;

5 is a diagram illustrating a format of an information channel frame message;

6 is a flowchart illustrating a typical process for establishing a call and performing data transfer in a delay equalization protocol in ISDN;

7 is a flowchart illustrating a process of processing an initial timer end primitive for a delay equalization protocol in accordance with a preferred embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

21: application layer 22: delayed equalization negotiation control layer

23: delay equalization multiple frame control layer

24a-24c: Channel Control Layer 25a-25c: Physical Media Dependent Layer

The above and other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

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

First, a key technical aspect of the present invention is to analyze / process a mode of a corresponding channel when an initial timer end (TCINIT_EXP) primitive, which terminates a timer when an initial negotiation progress between terminals is completed, is performed by an originating terminal (AU). Unlike the conventional method of determining and processing the TCINIT_EXP primitive, the process of processing the primitive for each mode for the same primitive (TCINIT_EXP) existing in each mode of the channel takes advantage of the similarity or the same. TCINIT_EXP primitive occurs in the delay equalization negotiation control layer 22 of FIG. 2 in various mode states (ie, call initialization mode, call initialization standby mode, directory number standby mode) for delay equalization according to primitive transfer between upper and lower layers. Checks the occurrence of this TCINIT_EXP primitive, determines the mode (ie It is to execute the processing routine of the primitive.

That is, in the present invention, by suppressing the generation of the code amount during the processing of the TCINIT_EXP primitive by merging the processing routines of the TCINIT_EXP primitive that can exist according to each mode (that is, the call initialization mode, the call initialization standby mode, the directory number standby mode) into one The processing speed can be improved.

On the other hand, as already mentioned above, the delay equalization protocol according to the present invention, as shown in Figure 2, the call control layer 25, delay equalization negotiation control layer 22 and delay equalization multi-frame control layer ( 23, various primitives, as shown in FIG. 3, are conveyed between each of these layers.

At this time, in order to deliver the serial bit stream delivered from the application layer 21 by multiple combinations of N 56/64 kbit / s channels, a frame structure as shown in FIG. 4 is required as an example. Frame data is assigned to each bearer channel and delivered. That is, referring to FIG. 4, in the frame structure according to the delay equalization protocol, one frame is composed of 256 octets, and 64 frames having such a configuration are gathered to form one multiframe. Here, the bearer channel means a channel provided with a network used for data transmission.

On the other hand, the octets of each frame are numbered, for example, from 1 to 256. Four of the 256 octets (ie, 64, 128, 192, and 256 octets) are used for information exchange and frame structure setting. Used as an overhead octet for That is, octet 64 is assigned to a frame alignment word (FAW), octet 128 is assigned to an information channel (IC), octet 192 is assigned to frame count (FC) information, Oct 256 is assigned to cyclic redundancy check (CRC) information for error correction.

Here, oct 64 has a fixed value of “0001 1011”, oct 128 is used for information exchange between terminals, and oct 192 is used to measure relative delay change between channels. As a module, it cycles on the boundaries of multiple frames, incrementing by 1 for each frame. That is, the first frame of the multi-frame will include the frame count value "0".

On the other hand, the message format of the information channel frame, as shown in Fig. 5, consists of a total of 16 octets, which communicate control information between two terminals (e.g., between the calling terminal and the called terminal). Used to. At this time, the first bit value (b1) of the octets 2 to 16 except for the octet 1 of the information channel frame is set to "1", and the eighth bit value (b8) of all the octets uses a 56kbit / s bearer channel. Set to "1" for consistent support between calls and calls using 64kbit / s bearer channels.

Referring to FIG. 5, oct 1 of an information channel frame is an alignment that provides information on the structure of the information channel frame, and has a constant value of “0111 1111” in a single alignment form in an initial oct, and oct 2 is a channel identifier. (CID: Channel ID) is used to identify individual channels in the setup of each call when dialing (calling) N calls at the same time. Here, the CID is represented by a 6-bit binary number encoded by a number in the range of 0 to 63. When the CID is "0", it means parameter negotiation. Oct 3 is a group identifier (GID) that is used to identify a group of bearer channels that associate a particular call.

Further, in octet 4, bits b2 to b4 indicate an operating mode, and bits b5 to b7 indicate a reserved bit (Res) set to "1" at the time of transmission and ignored on reception. The value "000" means operation mode 0, the bit value "001" means operation mode 1, the bit value "010" means operation mode 2, the bit value "011" means operation mode 3, and the rest ("100"). "To" 111 "indicate a reserved bit.

In addition, octet 5 is a rate multiplier (RMULT), which includes information defining the bandwidth of an application for a call with “sUBMULT” of octet 6, and a bearer channel rate (BCR) of octet 6 is a bearer channel. If the value is “0”, it means 56kbit / s base, if the value is “1”, it means 64kbit / s base, and it is “MFG” manufacturer ID flag of Octum 6 and its value is “1”. When set to, it means that the manufacturer ID is loaded in the digit fields of the octets 10 to 16 representing the telephone number dial digits.

On the other hand, in oct 7, the RI (Remote Indicator) area indicates the completion of delay equalization, RL Req (Remote Loopback Request) is used to request a loopback from the remote terminal to the local terminal (RL) The Remote Loopback Indication (RL IND) is used to indicate that the local terminal loops back all channels from the remote terminal to the remote terminal, and the REV (REVision level) checks the version compatibility between the local terminal and the remote terminal. Can be used to

And oct 8 is used to indicate the sub-address of the call, oct 9 represents the transmit flag, and remaining oct 10 to oct 16 represent the telephone number dial digits, respectively.

Therefore, by communicating control information of an information channel frame having the above-described configuration between terminals (for example, between the calling terminal and the called terminal) that want to set up a call for communication, for example, delay equalization and call setting. , Call release and so on.

On the other hand, the delay equalization protocol according to the present invention, as described above, is defined by four operation modes represented by three bits each, such operation mode information is octet 4 of the information channel frame as shown in FIG. (b2-b4) is included in the "Operation Mode 0", which is a mode that transmits data without delay equalization when call setup is completed after supporting initial parameter negotiation and exchange of telephone number (ie directory number) in the master channel. This is useful when the calling terminal requests a phone number, but delayed equalization is performed by some other means.

In addition, "operation mode 1" of the delay equalization protocol is a basic (common) mode of the delay equalization protocol that provides a very useful bandwidth for the user data rate by supporting a user data rate multiplied by a bearer rate. Band monitoring is not provided. Thus, the overhead octets for detecting errors are removed after the call is aligned, and one or more error conditions on the channel that prevent the synchronization of all systems are not automatically recognized after the call is activated.

In addition, “operation mode 2” of the delay equalization protocol supports user data rates multiplied by 63/64 times the bearer rate, providing in-band monitoring, and the user data rate remaining after inserting an overhead octet. to be. That is, the operation mode checks for errors while maintaining the multi-frame structure even after being activated.

Finally, “operation mode 3” of the delay equalization protocol is an integer multiple of 8 kbit / s whose user data rates include N × 56 and N × 64 kbit / s. Here, all channels use the same bearer channel rate, provide in-band monitoring to support continuous checking (CRC) for delay equalization and end-to-end bit error testing, and the overhead octets required for error monitoring are bandwidth This is further provided. Thus, in this mode of operation, it is possible to provide a sufficient user data rate, and overhead octets are included in each bearer channel.

Next, a description will be given of a typical process of establishing a call in ISDN and transferring data with the call established.

6 is a flowchart illustrating a typical process of establishing a call and performing data transfer in a delay equalization protocol in ISDN.

First, the delay equalization protocol classifies the operation into a large class, and sets up a call, adds a bandwidth to an existing call after a channel connection is established by call setup, and reduces user data without sudden degradation of the entire call. For this purpose, it can be divided into the process of removing bandwidth from an existing call, and the process of setting up a call consists of setting up a final channel (i.e., a master channel). Delay equalization (DEQ) process for implementing the delay and equalization when each channel is connected.

Referring to FIG. 6, the initial call setup process starts with the connection of the first channel in an N × 56 / 64kbit / s call, and the terminal initializes the master channel for the initial procedure (ie, access) for call setup. (Step 601). At this time, the parameter negotiation process is performed by this master channel, and the calling terminal will make an additional call after the complete negotiation process is completed.

Next, when the calling terminal is connected to the master channel through step 601, the calling terminal repeatedly transmits the information channel message as shown in FIG. 5 including the channel identifier (CID) set to "0". At the same time as starting the negotiation process, the initial timer TCINIT_EXP is stopped, that is, the delay equalization negotiation control layer (22 in FIG. 2) of the originating terminal generates an initial timer termination (TCINIT_EXP) primitive for stopping the initial timer (step 602). ). At this time, the originating terminal transmits by setting each parameter of the information channel message to a specific value, the group identifier (GID), RI and RL are all set to "0".

The initial timer termination (TCINIT_EXP) primitive generated here is a primitive that starts at the negotiation progress for channel initialization and ends the timer when the initial negotiation progress between the terminals is completed. The initial timer termination is directly related to the present invention. The process of processing when the (TCINIT_EXP) primitive is generated will be described later in detail with reference to the accompanying FIG. 7.

On the other hand, when a call by the negotiation process as described above is received and connected, i.e., when the calling terminal and the called terminal are connected, the called terminal transmits "1" to the channel and at the same time the delay equalization negotiation control layer 22 of FIG. Starts the TANULL_EXP timer, searches for multi-frame information or information channel messages, and if a valid information channel message is detected through the search, considers the channel as the master channel of the new call and stops the ongoing TANULL_EXP timer.

In this case, if a multi-frame is detected as a result of the search, the called terminal will consider the current call as an additional channel, stop the ongoing TANULL_EXP timer, and use the group identifier (GID) to identify the current call.

In addition, if the called terminal accepts the requested parameter in the master channel of the new call, the same value as the received value is returned to the calling terminal, and the delay equalization negotiation control layer 22 of the called terminal starts the TAINIT_EXP timer. Otherwise, if the called terminal does not accept the requested parameter, the called terminal returns RMULT and SUBMULT = 0 with the valid mode value in the information channel message to the calling terminal and then starts the TA DISC primitive or returns a different set of parameters. At the same time, start the TAINIT_EXP timer. In addition, in the additional channel of the current call, the called terminal allocates a group identifier (GID) of the call and returns a call in the assigned group identifier (GID) area, which is applied in the call received by the group identifier to the called terminal. The call can be identified, where the XFLAG region of the information channel message is set to one.

On the other hand, when the originating terminal receives an information channel message with a CID of 0 and a valid mode, it is regarded as a response from the called terminal. Therefore, the calling terminal analyzes each parameter of the received information channel message and performs a truncation procedure if it accepts or cannot accept the parameter requested by the called terminal. At this time, if the MFG flag in the received information channel message is 1, the manufacturer ID included in the digit field is received. If 0, the digit area is ignored, and the XFLAG is ignored.

Next, the originating terminal sends an information channel message in which the CID is set to 0 and the transmission flag is set to 1, and the digit fields are all set to 1, to request the initial telephone number.

Therefore, when an information channel message in which the XFLAG is set to 1 after the initial response is received at the called terminal, the called terminal sets the XFLAG in the information channel message to 1, and then sends the information channel message carrying the telephone number in the digit field to the calling terminal. By returning, telephone number exchange is performed between the calling terminal and the called terminal (step 603). At this time, if the number of channels is N, N-1 telephone number exchange will be performed between the calling terminal and the called terminal.

That is, when the DQ_CONN_REQ primitive is received from the call control layer 25 of the calling party to the delay equalization negotiation control layer 22, the delay equalization protocol carries an INIT REQ message on CC_INFO_IND and delivers the CC_INFO_IND to the called party. If an INIT REQ message is received, the corresponding INIT ACK message is sent to the calling party. In addition, the calling party sends a DN REQ message to the called party and requests a phone number. When the called party receives a DN REQ message from the calling party, the calling party generates a DN RESP message corresponding to the calling party and sends the telephone number to the calling party.

On the other hand, when the telephone number exchange between the calling terminal and the called terminal is completed through the above-described process, an information channel message having the CID set to 1 is transmitted to the called terminal, thereby notifying that the negotiation process is terminated. When the set information channel message is received, the called terminal sends an information channel message having the CID set to 1 to the calling terminal, thereby notifying the calling terminal that acceptance of the additional channel is ready (step 604). At the same time, the destination terminal stops the TAINIT_EXP timer and starts the TAADDO1_EXP timer (step 605).

Next, when the originating terminal receives an information channel message having a CID of 1 from the terminating terminal, it stops TCINIT_EXP related to the present invention, starts the TCADDO1_EXP timer, and then starts access to the additional channel (step 606). When the channel is connected, each terminal stops the TXADDO1 timer.

In addition, when the preparation of each channel is completed, the terminating terminal starts the TXDEQ_EXP timer, and uses a frame counter (FC) to measure the relative delay balance between the channels of the N × 56/64 kbit / s call. Since the order cannot be guaranteed to be the same as the call setup order, each terminal measures the relative delay of each channel using the CID arriving for channel alignment (step 607).

Then, equalize the delays of all the established channels, delay equalization completes call setup by each channel rearranging the timeslots (steps 608, 609), stops the TXDEQ_EXP timer and transitions to an active state when call setup is complete, That is, the calling terminal and the called terminal transition to the user data transmission state (step 610).

Accordingly, when each terminal receives RI = 1 in operation mode 1, it waits for A = 0 reception on all bearer channels for indication of readiness for data transmission. That is, when A = 0 is transmitted, each terminal waits to receive A = 0 in each bearer channel. Therefore, when each terminal receives A = 0 in the bearer channel, it stops transmitting the frame pattern and considers the call setup to be completed. At this time, each terminal will remove the multi-frame structure in all channels.

In addition, if a frame synchronization failure is detected in all bearer channels after the UE transmits RI = 1 and A-0 and receives A = 0, the call setup is considered complete and the multi-frame structure is removed from the bearer channel.

On the other hand, in operation modes 2 and 3, each terminal continuously monitors each channel of the call for delay equalization and frame arrangement, and at this time, also monitors bit errors between terminals. That is, each terminal transmits RI = 1, and stops the TXDEQ_EXP timer when it detects RI = 1.

Therefore, if a call is established between each terminal through multiple combining as described above, user data transmission between the call set terminals will be made.

Next, a description will be given of a process of processing an initial timer end primitive used in a delay equalization negotiation control layer according to the present invention in setting up a call by multiple combining as described above.

First, the initial timer termination (TCINIT_EXP) primitive to be processed in the present invention starts at the negotiation progress for channel initialization in the delay equalization protocol of the integrated information communication network and terminates the timer when the initial negotiation progress between terminals is completed. Primitives, such TCINIT_EXP primitives can be generated, for example, in the CALL INIT state, the CALL INIT WAIT state, and the directory wait (AWAIT DN) state. The effective generation range of the timer can be set, for example, about 500 msec-10 sec. At this time, if the initial timer end primitive for stopping the initial timer does not occur for a predetermined time after starting the initial timer, the initial timer is automatically stopped, and the calling terminal keeps the current state of the channel and waits for reception of the next message. Will be.

Here, the call initialization (CALL INIT) state is a state in which the originating terminal transmits an INIT REQ message on the initial channel for the initial parameter exchange, and waits for an INIT ACK message including a response from the corresponding destination terminal, CALL INIT WAIT state is the reception of the corresponding message from the called terminal in the state of completing parameter negotiation and directory number (DN) transmission from the calling terminal and transmitting the information channel message with the CID set to 1. Waiting for reception of an information channel message with a CID set to 1, and a directory waiting (AWAIT DN) state in which a calling terminal requests a directory number from a calling terminal to wait for reception of a requested directory number. It is a state.

More specifically, the initial timer termination (TCINIT_EXP) primitive to be processed according to the present invention may be generated in the above three cases, call initialization state, call initialization waiting state, directory waiting state. That is, the initial timer termination (TCINIT_EXP) primitive is when the initialization for call negotiation is completed, when an information channel message with CID set to 1 from the opposite terminal (ie, called terminal) or when the other terminal (ie, called terminal) is received. When a directory number (DN) is received from Rx), each is generated in the delayed equalization control layer 22 based on corresponding information (i.e. primitives) provided from the call control layer 25 of FIG.

Accordingly, in the present invention, unlike the conventional method of analyzing / processing the state (i.e., mode) of the corresponding channel first, and then determining the processing routine of the TCINIT_EXP primitive, various methods for delay equalization according to primitive transfer between upper and lower layers are performed. When the TCINIT_EXP primitive occurs in the delayed equalization negotiation control layer 22 of FIG. 2 in the mode state (ie, call initialization mode, call initialization standby mode, directory standby mode), the occurrence of this TCINIT_EXP primitive is checked and the mode of the corresponding channel is checked. (I.e., the current state) and then execute the processing routine for the primitive

7 is a flowchart illustrating a process of processing an initial timer end primitive for a delay equalization protocol according to a preferred embodiment of the present invention.

Referring to FIG. 6, as described above with reference to FIG. 6, a TCINIT_EXP primitive is generated in the delay equalization negotiation control layer 22 of FIG. 2 to stop a currently in progress TXDEQ_EXP timer in a state where call setup by multiple combining is completed. (Step 702), the state of the channel to which the current call is established is checked, that is, the state of the current channel based on the channel state information (i.e., primitive signal) provided from the call control layer 25 in the delay equalization negotiation control layer 22. Check to determine the corresponding primitive processing routine.

That is, in step 704, based on the channel state information (i.e., primitive signal) provided from the call control layer 25, the current channel to which the call is set up is INIT on the initial channel for initial parameter exchange at the originating terminal side. It transmits a REQ message and checks whether it is in a Call INIT state waiting for an INIT ACK message including a response from the corresponding destination terminal. The process proceeds to step 710 to be described later. If the check result indicates that the current channel is not in the call initialization state, the process proceeds to step 706.

Next, in step 706, based on the channel state information (i.e., primitive signal) provided from the call control layer 25, the current channel, to which the call is established, performs parameter negotiation and directory number (DN) transmission at the originating terminal. When the CID = 1 is completed, it is checked whether or not a call initialization wait state is awaiting reception of a corresponding message from a called terminal, that is, waiting to receive an information channel message having a CID set to 1.

If the current channel is in the call initialization waiting state as a result of the check in step 706, the process proceeds to step 710, which is described later. If the current channel is not in the call initialization state, the current channel is in the directory number waiting state in the calling terminal. (Step 708), subsequent processing proceeds to step 710. In this case, when the current channel is not in the call initialization state and the call initialization standby state, the directory number standby mode is considered to be because the TCINIT_EXP primitive is set to occur only in the above three cases.

That is, the present invention merges the processing routines of the TCINIT_EXP primitives that can exist according to each mode, that is, the call initialization mode, the call initialization standby mode, and the directory number standby mode, into one, and when the TCINIT_EXP primitive occurs, processing according to the current channel state By doing so, the amount of code generated when processing the TCINIT_EXP primitive can be minimized as much as possible, and the subroutine for processing the TCINIT_EXP primitive that proceeds according to each state can be drastically reduced, thereby greatly increasing the primitive processing speed. .

Of course, we cannot completely rule out the possibility that the TCINIT_EXP primitive will occur in other than the three states described above, but if the TCINIT_EXP primitive occurs in any of these three states, bypass it and maintain the current state. By setting, you will be able to respond smoothly.

Next, in step 710, the initial timer is stopped according to the occurrence of the TCINIT_EXP primitive while maintaining the state of the current channel to which the call is set, and a message for disconnection of the call is transmitted to the opposite terminal (ie, the called terminal). At the same time, the delay equalization negotiation control layer 22 on the calling terminal starts the truncation timer TCDISC (step 712).

Here, the truncation timer (TCDISC) is started when the calling terminal requests the disconnection of the call and is stopped when the disconnection of the call is completed according to a response from the corresponding called terminal. For example, it can be set to about 1sec-10sec. Therefore, if no response message is received for a predetermined time after starting the truncation timer, the truncation timer is automatically stopped, and the calling terminal will wait for the reception of the next message while maintaining the current state of the channel.

Then, the calling terminal transitions the current state to the call disconnection standby state, that is, when the current channel to which the call is set is one of the call initialization mode, the call initialization standby mode, and the directory number standby mode, the calling terminal transitions it to the call disconnection standby state. (Step 714).

At this time, the truncation timer TCDISC currently in progress in the delayed equalization negotiation control layer 22 on the originating terminal side corresponds to a call control layer when a response message corresponding to the call disconnection message transmitted from the originating terminal is received from the called terminal. It will be stopped based on the acknowledgment information (ie, primitive) provided from (25).

As described above, according to the present invention, when processing the TCINIT_EXP primitive, the upper and lower layers, unlike the conventional method of first analyzing / processing the state (i.e., mode) of the corresponding channel and then determining and performing the processing routine of the TCINIT_EXP primitive. When the TCINIT_EXP primitive occurs in various mode states (ie, call initialization mode, call initialization standby mode, directory standby mode) for delay equalization according to primitive forwarding, the occurrence of this TCINIT_EXP primitive is checked, and the mode of the corresponding channel (i.e. By determining the current state and then performing the processing routine of the corresponding primitive, it is possible to easily implement by suppressing the increase in the amount of code for processing the message, and also the sub for the processing of the TCINIT_EXP primitive that proceeds according to each state. Significantly speeds up TCINIT_EXP primitive processing by significantly reducing routines It can be achieved.

Claims (7)

The initial negotiation process between the calling terminal and the called terminal may be completed in the delay equalization protocol of a general information communication network having a hierarchical structure including a call control layer, a delay equalization negotiation control layer, and a delay equalization multiple frame control layer. In the method for processing the initial timer end primitive at the originating terminal side to terminate the timer in progress, When the initial channel negotiation between the calling terminal and the called terminal is completed, a first step of checking whether an initial timer termination primitive for terminating the ongoing initial timer according to the call setup start is generated in the delay equalization negotiation control layer; A second step of checking whether a state of a current channel to which a call is set is one of a plurality of preset channel states when the initial timer end primitive is generated in the delay equalization negotiation control layer as a result of the check in the first step; A third step of generating a message for disconnection of the set call while maintaining the current state of the current channel when the state of the current channel is any one of the preset plurality of channel states and transmitting the message to the called terminal; And And a fourth step of starting a truncation timer at the same time as transmitting the truncation message and transitioning the originating terminal to a call truncation standby state. The method of claim 1, further comprising: bypassing and maintaining the current initial timer end primitive when the state of the current channel is not one of the preset plurality of channel states. An initial timer termination primitive processing method for a delay equalization protocol in an integrated information network. The method according to claim 1 or 2, wherein the initial timer operates only for a predetermined predetermined time range, and automatically stops the initial timer when there is no occurrence of the initial timer end primitive for the predetermined predetermined time. And waiting for reception of a next message while maintaining the current state of the channel. The initial timer of claim 1 or 2, wherein the predetermined plurality of states of the current channel are a call initialization state, a call initialization waiting state, and a directory waiting state. How to handle end primitives. The truncation timer according to claim 1 or 2, wherein the truncation timer operates only for a predetermined predetermined time range, and automatically stops the truncation timer when there is no response message from the called terminal for the predetermined predetermined time. And waiting for reception of a next message while maintaining the current state of the channel. 6. The method of claim 5, wherein the starting and stopping of the truncation timer is performed in the delay equalization negotiation control layer. 6. The method of claim 5, wherein the set call is disconnected based on acknowledgment information provided from the call control layer when a corresponding response message is received from the called terminal in response to the call disconnection message. An initial timer termination primitive processing method for a delay equalization protocol in an integrated telecommunication network.

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