KR100277684B1 - Virtual Channel Connection Management Method of Voice Channel for Telephone Service in Access Network - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a virtual channel connection management method of a voice channel.

2. The technical problem to be solved by the invention

The present invention fixes the number of channels that can be allocated per virtual channel connection (VCC) based on an access network platform in a communication system, but connects and releases the virtual channel connection (VCC) according to the use of channels. Since it can provide voice and telephone (VTOA) services through the network, it aims to provide a virtual channel connection management method to reduce the burden of ATM virtual channel connection (VCC) management and increase the efficiency of ATM bandwidth.

3. Summary of Solution to Invention

The present invention includes a first step of setting up a virtual channel connection (VCC) table for managing virtual channel connection (VCC); A second step of allocating a channel of a virtual channel connection (VCC) of the virtual channel connection (VCC) table for each call request over the allocated channel; And a third step of releasing a channel of a corresponding virtual channel connection (VCC) of the virtual channel connection (VCC) table when releasing a call of the number of channels allocated to a virtual channel connection (VCC).

4. Important uses of the invention

The present invention is used for voice channel VCC management in a communication system.

Description

Virtual Channel Connection Management Method of Voice Channel for Telephone Service in Access Network

The present invention provides a voice and telephony over ATM (VTOA) service through an asynchronous transfer mode (ATM) network based on an access network platform in a communication system. The number of channels per connection (VCC: Virtual Channel Connection) is fixed, but by setting and clearing VCC according to the channel usage, it is possible to reduce the burden of ATM VCC management and improve the efficiency of ATM bandwidth. It is about.

VTOA service that provides existing voice and 64kbps based service through ATM network provides advantages to users and network operators in terms of smooth acceptance of services provided by existing network as well as various services provided by ATM network. do.

One of the most active standards organizations for VTOA-related activities is the ATM Forum.

The ATM Forum's "VTOA Working Group" first interoperates circuit emulation to provide services for fixed circuits between private branch eXchanges (PBXs) in the form of point-to-point. We recommended the Circuit Emulation Service Interoperability Specification (CES-IS), followed by the ATM Adaptation Layer (AAL1: ATM) in response to market demand for more diverse capacities, such as supporting multiple end points (PBXs). We recommend the "Trunking-VTOA" specification with the Adaptayion Layer 1) function.

One of the considerations for providing voice services is the utilization of ATM network bandwidth.

However, in the related art, a fixed bandwidth is allocated in the form of a Permanent Virtual Call (PVC) regardless of whether a predetermined channel is used through a circuit emulation method, thereby inefficient use of an ATM band.

In order to solve the above problems, the present invention fixes the number of channels that can be allocated per virtual channel connection (VCC) based on an access network platform in a communication system, Virtual channel connection management to reduce the burden of ATM virtual channel connection (VCC) management and increase the efficiency of ATM bandwidth by providing VTOA service through ATM network by connecting and disconnecting channel connection (VCC). It is an object of the present invention to provide a computer-readable recording medium recording a method and a program for realizing the same.

1 is a block diagram of an access network for interworking with an existing telephone network to which the present invention is applied.

2 is a structural diagram of an interlocking device for interworking with an existing telephone network in an access network to which the present invention is applied;

3 is an explanatory diagram showing a virtual channel connection (VCC) allocation of a voice channel used in the present invention.

4 is an explanatory diagram showing the efficiency of network resources according to the virtual channel connection (VCC) allocation of a voice channel for a telephone service in an access network used in the present invention.

5 is a diagram illustrating a method for managing a virtual channel connection (VCC) of a voice channel for a telephone service in an access network according to the present invention.

6 is a flowchart illustrating a method for managing a virtual channel connection (VCC) of a voice channel for a telephone service in an access network according to the present invention.

* Explanation of symbols for the main parts of the drawings

11: Optical Network Unit (ONU)

12: Optical Line Termination (OLT)

According to an aspect of the present invention, there is provided a method for managing a virtual channel connection of a voice channel applied to an access network of a communication system, the method comprising: setting a virtual channel connection (VCC) table for managing a virtual channel connection (VCC); ; A second step of allocating a channel of a virtual channel connection (VCC) of the virtual channel connection (VCC) table for each call request over the allocated channel; And a third step of releasing a channel of a corresponding virtual channel connection (VCC) of the virtual channel connection (VCC) table when releasing a call of the number of channels allocated to a virtual channel connection (VCC).

The present invention also provides a communication system having a processor, the function of setting a virtual channel connection (VCC) table for managing virtual channel connection (VCC); Assigning a channel of a virtual channel connection (VCC) of the virtual channel connection (VCC) table for each call request over the allocated channel; And reading a program for realizing a function of releasing a channel of a corresponding virtual channel connection (VCC) of the virtual channel connection (VCC) table upon release of the number of channels allocated to a virtual channel connection (VCC). Provides a record medium that can be.

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

1 is a configuration diagram of an access network for interworking with an existing telephone network to which the present invention is applied.

As shown in FIG. 1, an access network for interworking with an existing telephone network to which the present invention is applied may be used to match subscribers on a plain old telephone service (POTS) to a regular telephone service (POTS) and an ATM network. An optical network unit (ONU) 11 including a channel unit (CU) 111 and an interworking device (IWF) 112, and an interworking device for interworking various service providers ( And an optical line termination (OLT) 12 having an IWF.

Since the connection network for interworking with the existing telephone network to which the present invention having such a configuration is applied is only a technique well known in the art, detailed description thereof will be omitted herein. However, the interlocking apparatus (IWF) (112, 112) will be described in more detail.

FIG. 2 is a structural diagram of an interlocking device for interworking with an existing telephone network in an access network to which the present invention is applied. In the drawing, “201” is a signal processing unit, “202” is a switching unit, “203” is a multiplexing unit, and “204”. "205" represents a mapping and adaptation unit, "205" represents a virtual channel connection (VCC) management unit, "206" represents a call processing unit, and "207" represents a narrowband interface.

As shown in FIG. 2, the " Trunking-VTOA " interworking device (IWF) 112, 121 is a time division multiple (TDM) trunk of E1 / T1 input from private exchanges (PBX A, PBX B). The signal is extracted from the signal processing unit 201 is terminated, the call processing unit 206 is analyzed for the signal for each call.

Any time slot in units of 64 kbps from the E1 / T1 trunk is switched in the switching unit 202 and multiplexed in the multiplexing unit 203 according to the destination interpreted in units of Call-by-Call. In the mapping and analysis unit 204, the multiplexed 64kbps channels are mapped to designated data octets of the ATM trunk (VCC), matched to AAL 1, and transmitted.

The virtual channel connection (VCC) management unit 205 sets and releases the required VCC as a remote private exchange.

ATM trunk creation method is divided into one-to-one mapping and many-to-one mapping according to the mapping of 64kbps voice channel and ATM VCC.

One-to-one mapping means that one 64kbps voice channel is mapped to one ATM VCC, and it has to wait for 47 timeslots for transmission of one cell. Therefore, this causes a delay of 5.875 ms. In case of voice telephony, the end-to-end delay should be 25 ms or less, so the quality is guaranteed. Therefore, the number of multiplexers or switches in the ATM network and the additional echo-cancellation function in the network are guaranteed. Is required. Also, in order to reduce the delay, the Partially Filled method is used, but this method wastes ATM bandwidth, which is not a desirable configuration in the case where the resource of the bandwidth is insufficient.

In addition, the one-to-one mapping method is preferably applied to a small trunk that does not require switching and multiplexing functions, does not have a large demand for voice calls, or in some cases, few call requests. Therefore, this method is not suitable for application on the connection network as shown in FIG.

Meanwhile, in the many-to-one mapping method, since multiple voice channels are mapped to one ATM VCC, bandwidth can be appropriately used without causing delay. In particular, many-to-one mapping is a very suitable method in case of a voice service capable of predicting traffic, and the bandwidth can be adjusted according to the capacity of the ATM network through the establishment / release of ATM links composed of multiple voice channels.

For example, if the device occupies a bandwidth exceeding the capacity of the pre-appointed or current ATM network, the interworkers 112 and 121 recognize and release the particular VCC to reduce the use of this excess bandwidth. This VCC is released by preventing access to channels that are not being used (i.e. blocking the allocation of new channels) so that no channels are used. The virtual channel connection (VCC) allocation of such voice channels is shown in FIG. 3.

As shown in FIG. 3, the VCC allocation of the voice channel pre-allocates a VCC capable of accommodating this channel when the average use channel is M, and when there is a request for N and P channels exceeding that, VCC B and VCC C corresponding to the case are additionally allocated. At this time, if there is no room in the network, the channels of VCC B and VCC C are gradually removed as described above to release the corresponding VCC.

As described above, the interworking devices 112 and 121 of the "Trunking-VTOA" method have a complex interoperability function, but have an advantage of high efficiency of using an ATM band.

Now, by combining the circuit emulation method and the "Trunking-VTOA" method with reference to FIGS. 4 to 6, the many-to-one mapping method that accommodates multiple voice channels of the "Trunking-VTOA" method as one VCC is further simplified. However, although the number of channels per VCC is fixed, the process of setting and releasing VCC according to the use of channels will be described in more detail.

4 is an explanatory diagram showing the efficiency of network resources according to the virtual channel connection (VCC) allocation of the voice channel for the telephone service in the access network used in the present invention, Figure 5 is a voice for the telephone service in the access network according to the present invention An illustration of a method for managing a virtual channel connection (VCC) of a channel.

As shown in FIG. 4, the ATM VCC between the optical transmission unit 11 and the optical path terminator 12 is prepared for the number of subscribers that can be accommodated in the optical transmission unit 11. By fixing the number and the number of voice channels corresponding to one ATM VCC (= N), ATM bandwidth is efficiently used by unsetting VCC of Nx64bps bandwidth unit.

Therefore, this method is simpler and can reduce the burden of ATM VCC management and at the same time increase the efficiency of ATM bandwidth. That is, as shown in FIG. 5, the VCC table 5a is provided to accommodate the total subscribers connected to the optical transmission unit (ONU) 11 in order to efficiently manage the VCC.

For example, assuming 180 receiving subscribers per one optical transmission unit (ONU) 11, if the number of allocated channels (N) per one VCC is fixed to 30, the maximum required number of VCCs is six.

Referring to Fig. 5, each VCC table 5b, 5c consists of N records. Here, one record includes a line number for recognizing the E1 / DS1 line of the narrowband interface 207, a channel number of the corresponding line, and a use field to know whether the channel is currently used.

The VCC tables 5b and 5c set the channel usage field to 0 when the channel is released, and octets of the VCC table in the channel allocation queues 5d and 5e for allocating channels when there is a new call connection request. Record the number.

If a new call request occurs, the allocation of the VCC octet uses the octet of the VCC having a large number of used channels among the set VCCs first.

And, if the use of the average call channel is less than an integer (k) times N (i.e., the maximum number of channels one VCC can accommodate) for a period of time, less than the total number of available channels of the VCC currently in use, the VCC octet The allocation of selects an integer number (k) of the VCCs with the smallest number of used channels among the currently used VCCs, so that no more channel allocation is performed for this VCC, and the channel is allocated among the remaining VCCs for subsequent call requests.

In addition, when the average call channel usage continues, the allocation of the VCC octet is disconnected when all remaining channels in the k VCCs are released, and when there is a call connection request higher than the currently used VCC, the new VCC octet is allocated. Allocate a channel by connecting VCC.

6 is a flowchart illustrating a method for managing a virtual channel connection (VCC) of a voice channel for a telephone service in an access network according to the present invention. Here, blocking of the VCC means that a new channel cannot be allocated in addition to the channel set so far even if there is a spare channel in the VCC.

As shown in FIG. 6, the method for managing a virtual channel connection (VCC) of a voice channel for a telephone service in an access network according to the present invention first analyzes whether there are n new call requests (601).

As a result of the analysis, if the new call request is n, it is checked whether the number of available channels of the unblocked VCC is larger than the requested number of channels n (602).

If the number of available channels of the unblocked VCC is greater than the requested number of channels n, the octet of the VCC having a large number of used channels among the set VCCs is first used (607). That is, n octets are allocated in order of VCC having a large number of currently used channels.

As a result of the inspection, if the number of available channels of the unblocked VCC is not greater than the requested number of channels n, the blocking of the VCCs having fewer used channels is repeated (603), and the number of available channels is requested ( Determine if more than n) (604).

As a result of determination, if the number of available channels is larger than the requested number of channels n, octets of the VCC having the largest number of used channels among the set VCCs are used first (607). That is, n octets are allocated in order of VCC having a large number of currently used channels.

As a result, if the number of available channels is not greater than the requested number of channels (n) even though all of the deblocking operations have been performed, if the number of required channels is insufficient, it is analyzed whether a blocking VCC remains (605), and if not, blocking is not performed. If the number of available channels of the unclaimed VCC is greater than the requested number of channels (n) (602), and if not remaining, a new VCC is allocated (606), and the number of available channels of the unblocked VCCs (n) is requested (n). (602).

As a result, if there is no new demand call, the number of channels used by the average call channel is an integer (k) times N (ie, the maximum number of channels that one VCC can accommodate) from the total number of available channels of the VCC currently in use for a period of time. Compare less than subtracted (608).

As a result of comparison, if the number of channels used by the average call channel for a given time is less than Nxk times the total number of available channels of the VCC currently in use, the integer number of VCCs with the lowest number of channels used among the currently used VCCs is K After declaring blocking for this VCC so as not to make any more channel assignment for this VCC (609), it is analyzed whether there are n new call requests (601). At this time, for subsequent call requests, the channel is allocated among the remaining VCCs.

As a result of the comparison, if the number of channels used for a predetermined time average call channel is not less than Nxk times the total number of available channels of the currently used VCC, it is analyzed whether there are n new call requests (601). At this time, for subsequent call requests, the channel is allocated among the remaining VCCs.

If the average call channel usage continues, the VCC is disconnected when all remaining channels in the k VCCs are released.

As described above, the present invention relates to a VCC management method that reduces the burden of ATM VCC management and simultaneously increases the efficiency of ATM bandwidth in order to provide a VTOA service based on an access network platform. By providing voice and 64kbps based service, it provides advantages to users and network operators in terms of smooth acceptance of services provided by existing networks as well as various services provided by ATM networks.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains, and the above-described embodiments and accompanying It is not limited to the drawing.

As described above, the present invention reduces the burden of ATM Virtual Channel Connection (VCC) management and simultaneously improves the efficiency of ATM bandwidth when providing voice and telephone (VTOA) services over an ATM network based on an access network platform. There is an effect to increase. In addition, the present invention provides a low-cost voice service with a high-speed multimedia service to the user in terms of smooth acceptance of voice services provided by the existing network as well as various services provided by the ATM network, duplicate network to the network operators It is effective in providing competitiveness by reducing network construction operation management cost through construction, improving network resource use efficiency, and strengthening service provision ability.

Claims (7)

In the virtual channel connection management method of the voice channel applied to the access network of the communication system, A first step of setting a virtual channel connection (VCC) table for managing virtual channel connection (VCC); A second step of allocating a channel of a virtual channel connection (VCC) of the virtual channel connection (VCC) table for each call request over the allocated channel; And A third step of releasing a channel of a corresponding virtual channel connection (VCC) of the virtual channel connection (VCC) table when releasing a call of the number of channels allocated to a virtual channel connection (VCC); Virtual channel connection management method of the voice channel made, including. The method of claim 1, The virtual channel connection (VCC) table of the first step, It consists of a predetermined record alarm, wherein the predetermined record information is composed of line number information for recognizing the E1 / DS1 line, channel number information of the corresponding line, and use status information to know whether the channel is currently used. A virtual channel connection management method for a voice channel, characterized in that. The method of claim 2, The virtual channel connection (VCC) table, Voice channel, characterized in that the use status information is set to 0 when the channel is released, and the octet number of the corresponding virtual channel connection (VCC) table is recorded in the channel allocation queue for allocating a channel when a new call connection is requested. To manage virtual channel connections The method according to any one of claims 1 to 3, The second step, A fourth step of analyzing whether there is a new call request; A fifth step of checking whether the number of available channels of the unblocked virtual channel connection (VCC) is greater than the requested number of channels n when there is a new call request as a result of the analysis of the fourth step; As a result of the inspection in the fifth step, if the number of available channels of the unblocked virtual channel connection (VCC) is larger than the requested number of channels (n), the virtual channel connection having a large number of used channels among the established virtual channel connections (VCC) ( A sixth step of first using an octet of VCC); If the number of available channels of the unblocked virtual channel connection (VCC) is not greater than the requested number of channels (n), the blocking of the virtual channel connection (VCC) with less used channels is determined as a result of the fifth step. A seventh step of repeating the release to determine whether the number of available channels is greater than the requested number of channels n; An eighth step of first using an octet of a virtual channel connection (VCC) having a large number of used channels among the set virtual channel connections (VCC) if the number of available channels is greater than the requested number of channels (n); As a result of the determination in the seventh step, if the number of available channels is not greater than the requested number of channels (n) even though all of the deblocking operations have been performed, the method for analyzing whether a blocking virtual channel connection (VCC) remains is present. 9 steps; And As a result of the analysis of the ninth step, if the remaining step is passed to the fourth step, if not remaining after assigning a new virtual channel connection (VCC), the tenth step is passed to the fourth step Virtual channel connection management method of the voice channel made, including. The method of claim 4, wherein The third step, As a result of the analysis of the fourth step, if there is no new request call, one virtual channel connection (VCC) can accommodate the total number of available channels of the virtual channel connection (VCC) currently in use for a predetermined time. An eleventh step of comparing a number less than an integer k times the maximum number N of channels; As a result of the comparison in the eleventh step, the maximum number of channels that one virtual channel connection (VCC) can accommodate from the total number of available channels of the virtual channel connection (VCC) currently in use for a predetermined time ( If the number is less than the integer (k) times N), the number of virtual channel connections (VCC) with the smallest number of used channels among the currently used virtual channel connections (VCC) is selected and integers (K) are selected. (12) declaring blocking for this virtual channel connection (VCC) so as not to make any more channel assignment, and then proceeding to the fourth step; As a result of the comparison in the eleventh step, the maximum number of channels that one virtual channel connection (VCC) can accommodate from the total number of available channels of the virtual channel connection (VCC) currently in use for a predetermined time ( A thirteenth step, if not less than the integer (k) times of N), goes to the fourth step; And Step 14 of disconnecting the virtual channel connection (VCC) when all channels remaining in the integer k number of virtual channel connections (VCC) are released when the average call channel usage continues. Virtual channel connection management method of the voice channel made, including. The method of claim 5, The blocking process of the virtual channel connection (VCC), Virtual channel connection management method of the voice channel, characterized in that even if there is a free channel in the current virtual channel connection (VCC) to prevent the allocation of a new channel other than the channel set up so far. In a communication system having a processor, Setting a virtual channel connection (VCC) table for virtual channel connection (VCC) management; Assigning a channel of a virtual channel connection (VCC) of the virtual channel connection (VCC) table for each call request over the allocated channel; And A function of releasing a channel of a corresponding virtual channel connection (VCC) of the virtual channel connection (VCC) table when releasing a call of the number of channels allocated to a virtual channel connection (VCC). A computer-readable recording medium having recorded thereon a program for realizing this.