JP6514311B1 - Transmission management apparatus, transmission management method, and program - Google Patents

Abstract

An object of the present invention is to eliminate an unfair feeling that a high speed communication standard side is slow when a relatively low speed communication standard and a relatively high speed communication standard use bands that interfere with each other. SOLUTION: A first communication using a first band having a plurality of subchannels, VDSL2, and a second band including the first band and a band higher in frequency than the first band are used. When managing an aggregation device that can use G.fast, which is two communications, and can communicate according to any of VDSL2 and G.fast to a plurality of in-home devices connected by metal wires, When G.fast and G.fast interfere with each other, G.fast communicates as a limited communication using a band other than the first band, and the speed of the first communication exceeds the first threshold, and When the speed of the two communication is lower than the second threshold, one or more subchannels sequentially selected from the high frequency band side among the subchannels are assigned to G. fast with limitation. [Selected figure] Figure 4

Description

  The present invention relates to management of communication in an environment in which different transmission systems in which frequency bands to be used overlap with each other.

  With the expansion of the use of the Internet, the trend for high speed communication environment continues. In fixed circuits, optical fibers are in widespread use. However, although the main trunk line is in the process of becoming optical fiber, there are situations where it is difficult to connect only with optical fiber, such as old apartment buildings and remote places. In the so-called last one mile, there are still many uses of digital subscriber lines (DSL) using telephone lines which are existing metal lines, and technology development for realizing high-speed communication with DSL is in progress.

  Such DSL standards include VDSL. The VDSL 1 uses a band of 12 MHz or less and separately defines a band (DS 1) used for the downstream and a band (US 1) used for the upstream to realize high-speed communication. This is called frequency division duplex (FDD). In VDSL2 which is an extension of VDSL1, in addition to the band of VDSL1, a band of 30 MHz or less, which is a high frequency band, is used. Similar to the band of VDSL1, the expanded band is divided into bands used for downstream (DS2, DS3) and bands used for upstream (US2, US3). The order of these subchannels is DS1, US1, DS2, US2, DS3, and US3 from the low frequency side.

  As a further high-speed DSL standard, G. fast is recommended in ITU-T and commercialization is in progress (Non-Patent Documents 1 and 2). G. fast uses a band up to 212 MHz which is a higher frequency band in addition to the band of VDSL2. G. fast does not divide and use this extended band by frequency band, but adopts time division duplex (TDD) system.

  However, when VDSL 2 and G. fast are mixed in one apartment, as shown in FIG. 2A, the use bands overlap and interfere with each other. In this case, as shown in FIG. 2B, it is necessary to limit the use band of G.fast to avoid interference.

ITU, "G. 9700: Fast access to subscriber terminals (G.fast)-Power spectral density specification", [online], August 16, 2017, ITU-T Publications, [searched October 20, 2017], Internet <URL: https://www.itu.int/rec/T-REC-G.9700> ITU, "G.9701: Fast access to subscriber terminals (G.fast)-Physical layer specification", [online], October 18, 2017, ITU-T Publications, [October 20, 2017 search], Internet <URL: https://www.itu.int/rec/T-REC-G.9701>

  However, the band used by VDSL 2 is a band resistant to noise among the bands used by G. fast. For this reason, as shown in FIG. 2 (b), when trying to provide G.fast service only on the high frequency band side by avoiding interference, a subscriber who receives service on VDSL2 that occupies the low frequency band side that is resistant to noise In some cases, the actual communication speed may be higher than a subscriber who receives service with limited G.fast that uses only the high frequency band side susceptible to noise. In other words, the relationship between the best effort relationship and the actual communication speed is reversed, and the contractor with a G.fast contract who is supposed to have a faster communication standard has a slower service. There is a risk that you will be

  Therefore, in the present invention, in the case where a relatively low speed communication standard and an originally relatively high speed communication standard use bands that interfere with each other, the sense of inequity is eliminated while avoiding interference and comparison is performed. Purpose is to improve the user experience with high speed communication standards.

The present invention relates to a first communication using a first band having a plurality of subchannels, and a second communication using a second band including the first band and a band having a frequency higher than the first band. Is available,
When managing an aggregation device that can communicate with a plurality of in-home devices connected by a metal wire according to any one of the first communication and the second communication,
When the first communication and the second communication interfere with each other, the second communication communicates as a restricted second communication that communicates using a band other than the first band,
If the speed of the first communication is above the first threshold and the speed of the second communication is below the second threshold:
Since the above-mentioned subject was solved by setting it as the aggregation device which adopted the management method which assigns one or a plurality of subchannels selected in order from the high frequency band side among the subchannels to the restricted second communication. is there.

  Here, in selecting the subchannel to be allocated to the restricted second communication, the effective speed of the second communication is set to the first communication by allocating the subchannel from the first communication to the second communication. It is better to exceed the effective speed.

  As a specific example, in the case where the first communication is VDSL2 and the second communication is G.fast, the management method, program and aggregation device using them according to the present invention can be suitably used. In this case, it is often convenient to balance two subchannels US3 and DS3 from the high frequency side of VDSL2 to G. fast. Furthermore, there may be a case where two subchannels US2 and DS2 have to be allocated to G.fast, but since VDSL2 becomes VDSL1, it can be a problem as service provision.

  According to this invention, when VDSL2 and G.fast contractors coexist in one collective housing and the frequency band to be used is shared, the VDSL2 contractor has a higher effective speed. Even in this case, it can be properly adjusted so as not to be disadvantageous to the G.fast contractor. This makes it easier for the contractor to switch from VDSL2 to G.fast, since those who newly sign up for the effective speed of G.fast will not be disadvantaged. This means that it is easy to proceed with the generational change to G.fast, and it is easy to solve the situation where interference between VDSL2 and G.fast occurs early.

An illustration showing an environment using the aggregation device according to the present invention (A) A conceptual diagram when the frequency band used by VDSL2 and G.fast interferes, (b) A conceptual diagram when G.fast is a restricted band to avoid interference Conceptual diagram of the situation where noise occurs only in the restricted band Flow example and conceptual example diagram showing an embodiment example of the management method according to the present invention

  Hereinafter, the present invention will be described in detail along with specific embodiments. The present invention is an aggregation device capable of communicating with a plurality of home apparatuses, a method of managing the aggregation device, and a program for operating the aggregation device as the present invention.

  An aggregation device according to the present invention uses a first communication using a first band having a plurality of subchannels, and a second band including the first band and a band having a higher frequency than the first band. This is an aggregation device 11 which can use the second communication and can communicate with a plurality of home devices connected by metal wires according to any one of the first communication and the second communication.

  The subchannel of the first band is obtained by dividing the first band into a plurality of bands. That is, the first communication is a frequency division duplex (FDD) method. On the other hand, the second communication may be Time Division Duplex (TDD), frequency division duplex, or a combination of these.

  In the first communication and the second communication, the frequency band used by the second communication is wider on the high frequency band side. However, basically, the low frequency side is more resistant to noise, and thus the use of the first band leads to an improvement in quality in performing the second communication. However, while the second communication can also be used on the high frequency side, the first communication can only use the first band. For this reason, the contractor of the in-home apparatus communicating with one aggregation apparatus mixes users of both the first communication and the second communication, and the first communication and the second communication interfere with each other. In this case, the service provision of the second communication achieves compatibility with the first communication by communicating as a restricted second communication that communicates using a band other than the first band.

  The main feature of the present invention lies in the processing when the second communication is communicated as a restricted second communication under such a situation where interference occurs. Since the frequency band of the restricted second communication is a high frequency, it is inevitably susceptible to noise and the communication speed tends to be reduced. If this tendency progresses excessively and the speed of the first communication exceeds the first threshold and the speed of the second communication falls below the second threshold, the subchannels are selected in order from the high frequency band side Assign one or more subchannels to the restricted second communication.

  In the case where the original second communication is a TDD system, the entire frequency band of the restricted second communication including the subchannels of the subchannel allocated to the restricted second communication is a TDD system. It may be used, or the assigned subchannel may be handled as it is in the FDD mode.

  The above-described first threshold and second threshold may be directly input when the aggregation device 11 is installed, or may be remotely settable by the communication carrier. Further, the aggregation device 11 may be able to automatically obtain and set the optimum value according to the communication history. The first threshold and the second threshold may be equal. However, if the first threshold value> the second threshold value, the second communication side may be slow even if the present invention is implemented. Therefore, it is preferable that the first threshold value ≦ the second threshold value.

  An example of an environment using the collecting apparatus 11 according to the present invention is shown in FIG. The aggregation device 11 is connected to a telecommunications carrier's network by a high-speed communication standard such as an optical fiber, and provides an Internet connection environment to each home device 12 in the form of being relayed thereto. The collective device 11 and the in-home device 12 are connected by a metal wire such as an existing telephone line, and there is an environment where many communications can coexist at frequencies ranging from about 100 kHz to about 1 GHz.

  Here, as an environment where the collective device 11 and the in-home device 12 are installed, there are a plurality of rooms, and different contractors move in each room, and each contractor's house 2 (2a, 2b) A description will be given by taking the collective housing 1 contracted with the communication company as an example. However, the implementation environment of the present invention is not limited to such a case. For example, even in a business environment such as an office building where multiple tenants enter and each tenant installs a home apparatus and makes different contracts It can be implemented similarly.

  Here, the contractor's house 2a in which the in-home apparatus 12a is installed is contracted by G.fast, and the in-home apparatus 12a communicates with the aggregation apparatus 11 by G.fast. This G.fast corresponds to the above-mentioned second communication. The contractor house 2b in which the in-home device 12b is installed is contracted by VDSL2, and the in-home device 12b communicates with the aggregation device 11 by VDSL2. This VDSL 2 corresponds to the above-mentioned first communication. Although other contractor homes may exist, it is assumed that they are also contracted by G.fast or VDSL2 and collectively described as contractor homes 2a and 2b.

  The above VDSL2 is an extension of VDSL1 (-12 MHz), and in the frequency band up to 30 MHz (the first band 21 above), a subchannel for downstream (DS) and a subchannel for upstream (US) There are three channels and three channels alternately. That is, from the low frequency side, it has a total of six subchannels of DS1, US1, DS2, US2, DS3 and US3 and these are used in the FDD system. However, it is also possible to communicate without using one or more subchannels as needed from the high frequency band side where noise tends to increase.

  The G.fast described above can use the VDSL2 band (̃30 MHz) according to the standard, and can further utilize a band on the higher frequency side than the VDSL2 band. It corresponds to the second band 22 described above. G. fast uses the entire second band 22 in the TDD scheme unless otherwise specified.

  Therefore, as shown in FIG. 2A, VDSL2 which is the first communication using the first band in the FDD system, and G.fast which is the second communication using the second band in the TDD system, , Interfere in the metal wire in the housing complex 1. On the other hand, as shown in FIG. 2 (b), the subscriber's residence is used only by using the above-described restricted second band 23 excluding the first band used by VDSL2 from the frequency band used in G.fast. Provides G.fast communication service for 2a.

  Possible situations in this environment are shown in FIG. G. fast using only the restricted second band 23 is susceptible to noise because it is a high frequency band. On the other hand, VDSL 2 using a low frequency band is less susceptible to noise, and the communication quality tends to be relatively stable. This state is shown in FIG.

  In the above environment, the collective device 11 periodically makes the following judgment to optimize the effective speed of the entire collective housing. The installed aggregation device 11 executes communication standard determination means for determining whether the in-home device 12 installed in the aggregation housing communicates with VDSL 2 or with G.fast, and performs higher speed within the contracted range Communication according to various communication standards. Therefore, even if the collective device 11 according to the present invention is installed, when all the contractor homes 2 in the collective housing 1 are contracted by VDSL 2, the whole is communicated by VDSL 2 and special adjustment processing Do not do. Also, even when all contractor homes 2 are contracted by G.fast, the whole is communicated by G.fast, so no special adjustment processing is performed. Note that the program according to the present invention can be implemented as firmware that makes the following determination and assignment using the basic functions of the aggregation device 11.

  First, if the G.fast in-home device 12a is connected to the in-home device 12 connected to the aggregation device 11 before the determination flow, VDSL2 (the first communication described above) and G.fast (the second communication described above) Confirm the presence of interference with communication). If the interference is confirmed, the G.fast in-home apparatus 12a communicates as a restricted second communication using only a band of 30 MHz or more. The G.fast in-home apparatus 12a does not use any of the VDSL2 band, and the VDSL2 in-home apparatus 12b uses all of the VDSL2 band and operates completely on the frequency basis.

  Furthermore, the aggregation device 11 constantly monitors the communication speed between the in-home devices 12a and 12b. In addition, there are a plurality of in-home devices 12a and 12b in many cases, and the communication speed uses an optimum value according to the situation, such as an average value or a median value for each in-home device 12a, 12b.

  It is judged about the speed of the 1st communication and 2nd communication which always monitored like a flow example of FIG. 4 (S101). First, it is determined whether the communication speed of the home apparatus 12a using G. fast, which is the second communication, falls below the second threshold (S102). If the communication speed is equal to or higher than the above-mentioned second threshold (S102 → NO), the frequency allocation is left as it is (S103). This is the case where the communication quality of the subscriber using G.fast is not so degraded.

  On the other hand, if the communication speed of the subscriber using G.fast falls below the second threshold above (S 102 → YES), that is, if the communication quality of G.fast falls below the allowable range, the following judgment is made Move to It is determined whether the communication speed of the home apparatus 12b using the VDSL2 which is the first communication exceeds the first threshold (S111). If the communication speed is equal to or less than the above-mentioned first threshold (S111 → NO), the frequency allocation is left as it is (S112). This is because not only G.fast but also the communication quality of the contractor using VDSL2 is greatly reduced, and changing the frequency allocation will cause the quality of the contractor using VDSL2 to be further deteriorated too much. It is a case where it is desirable to leave it as it is.

  On the other hand, if the communication speed of VDSL2 exceeds the above-mentioned first threshold (S111 → YES), it can be judged that VDSL2 has a margin and there is no margin on G.fast, so VDSL2 is used Allocate part of the subchannel to G.fast restricted second communication.

  The subchannels assigned from VDSL2 to G.fast are one or more subchannels selected in order from the high frequency side. Here, VDSL2 has three sub-channels for upstream (US) and downstream (DS) according to communication standards, and US3, DS3, US2, DS2, US1, DS1 in order from the high frequency side. It has become. Among the subchannels to be assigned, it is particularly preferable to apply only US3 or US3 and DS3. Many contractors often use the downstream side, and the upstream side can often afford relatively. For this reason, even if only US3 is allocated to G.fast, the decrease in the effective speed on the VDSL2 side is often minimized. On the other hand, there may be cases where the effective speed of G.fast can not be improved by allocating only US3. In such a case, both US3 and DS3 should be allocated.

  In any of the determinations, the aggregation device 11 continuously monitors the communication speed with the in-home devices 12a and 12b. Depending on the monitoring, assignment from VDSL2 to G.fast may be further performed. However, the subchannels of US1 and DS1 can not continue communication unless VDSL2 maintains them. Therefore, the maximum number of subchannels that can be assigned to G.fast should be up to four of US3, DS3, US2, and DS2.

  Also, depending on the subsequent monitoring, when noise is improved, some subchannels assigned to G.fast as appropriate may be reassigned to VDSL2. After that, reassignment to G.fast may be performed as noise increases.

Reference Signs List 1 collective housing 2, 2a, 2b, 2c contractor's house 11 collective device 12 indoor device 12a (of G.fast) indoor device 12b (of VDSL 2) indoor device 21 first band 22 second band 23 restricted second band

Claims (3)

Is G.fast using the first communication is a VDSL2 using a first band having a plurality of sub-channels, and a second band including a band of higher frequency than said first band includes the first band You can use the second communication,
A collective device capable of communicating with a plurality of in-home devices connected by a metal wire according to any one of a first communication and a second communication,
When the first communication and the second communication interfere with each other, the second communication communicates as a restricted second communication that communicates using a band other than the first band,
If the speed of the first communication is above the first threshold and the speed of the second communication is below the second threshold:
An aggregation device which allocates one or more subchannels selected in order from a high frequency band side among the subchannels to the restricted second communication. Is G.fast using the first communication is a VDSL2 using a first band having a plurality of sub-channels, and a second band including a band of higher frequency than said first band includes the first band You can use the second communication,
A method of managing an aggregation device capable of communicating with a plurality of devices connected by a metal wire according to any one of a first communication and a second communication ,
When the first communication and the second communication interfere with each other, the second communication communicates as a restricted second communication that communicates using a band other than the first band,
If the speed of the first communication is above the first threshold and the speed of the second communication is below the second threshold:
The management method of allocating one or more subchannels sequentially selected from the high frequency band side among the subchannels to the restricted second communication. A program for causing a computer to function as the aggregation device according to claim 1 .

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