Method and device for communication via digital subscriber line technology

FIELD: information technology.

SUBSTANCE: method involves the following steps: receiving a communication efficiency parametre; if the communication efficiency parametre is equal to a predetermined value or exceeds the predetermined value, the first transmitter-receiver pair and the second transmitter-receiver pair use a predefined communication standard during communication, where determination of the predefined communication standard is carried out on the first transmitter-receiver pair and the second transmitter-receiver pair, respectively. A predefined bit table and a gain table are provided on the first transmitter-receiver pair and the second transmitter-receiver pair, respectively. According to the described method, in case of high broad-band noise, fast switching to the predefined bit table and gain table can be provided using a simple message or "request-response" mechanism. Use of this method avoids the need to exchange bit tables and gain tables.

EFFECT: avoiding wastage of channel capacity.

17 cl, 7 dwg

 

The scope of the invention

The present invention relates to the field of communication technologies, in particular to a method and device for communication on the digital subscriber line.

The level of technology

For several years the development of technology asymmetric digital subscriber line asymmetric digital subscriber line (ADSL) has evolved from the first generation to ADSL2 + (asymmetric digital subscriber line (second generation), ADSL2+ (ADSL2 with increased bandwidth in the downstream direction) and the latest VDSL2 (digital subscriber line second generation with very high throughput). Used frequency band is gradually expanding, and the throughput is also gradually increasing. In ADSL and ADSL2 uses a range of frequencies up to 1.1 MHz in a downward direction, these technologies allow to achieve the maximum bandwidth of 8 Mbit/s; technology ADSL2+ bandwidth expanded to 2.2 MHz, this technology allows to achieve a maximum throughput of 24 Mbps; finally, VDSL2 allows you to use a range of frequencies up to 30 MHz and to ensure maximum throughput of 100 Mbit/s, symmetric in ascending and descending directions. The above-mentioned technologies digital subscriber line have a common name xDSL.

A transmission medium for xDSL is necr Nirvana twisted pair, therefore, between different twisted pairs of possible electromagnetic interference; in other words, the signals transmitted over twisted pair, can get into another twisted pair via electromagnetic radiation, can result in crosstalk. To reduce such crosstalk twisted pairs have different step of twisting and xDSL applied differential transmission and reception of the signal, the maximum attenuation conventional mutual interference signals due to the symmetry of the twisted pairs. In practice, however, the symmetry of the twisted pairs is imperfect, and crosstalk still exist. In addition, twisted pairs can be affected by signals from the outside, because the accuracy of the symmetry of the twisted pairs is limited, and signal interference can be transformed into a differential signal interference.

Crosstalk between pairs can significantly affect services.

For example, when there is coordination of pair 1, the adjacent lines are not involved, this can be achieved a higher activation limit with respect to the threshold signal-to-noise ratio. Then begins the coordination of neighboring lines, and the signals emitted by these lines create the signal crosstalk on pair 1, which can lead to increased noise, reaching 10 or more decibels. While it is initially set ratio signal/noise DL the pair 1 (typically 6 dB) cannot guarantee operation if the initial frequency error rate and line speed. This at best can lead to a higher frequency of erroneous bits, and in the worst case - to disconnection and re, leading to the interruption of services. In the case of VDSL2 this problem is exacerbated. Since VDSL2 applies a higher frequency and a shorter line, and remote crosstalk increases with frequency and decreases with increasing distance, the influence of crosstalk in this case is higher. In ADSL2+ mode rapid adjustment. Quick approval allows you to reconnect in 3 seconds (minimum), but to completely eliminate the influence on the service fails. In addition, some services, such as voice over IP, may require re-connection due to any problems, such as broken links, so maintaining a high quality connection (e.g., no gaps) can be quite important to maintain the quality of services and facilities users.

In the previous prior art, there are three kinds of solutions to eliminate crosstalk caused by neighboring transition line from the inactive non-working state (inactive state, the signal line is missing) in normal operating condition. The following are descriptions of the above-mentioned three types of technical solutions.

The first solution consists in HC is the chances of improving the target threshold signal-to-noise ratio (Signal to Noise Ratio, SNR) for a pair of 1, while matching pair 1 is reserved greater signal/noise; then, with a sharp rise crosstalk target frequency transmission error rate when communication can be maintained as long as the increase does not reach or exceed the target signal-to-noise ratio, and the threshold is high enough to avoid renegotiation. The advantage of this solution is its simplicity and easy practical feasibility, but it has the disadvantage that the increase of the threshold signal-to-noise ratio can reduce the maximum achievable speed on a pair of 1. In addition, the crosstalk noise is unstable, i.e. the indices of the spectral energy density of the noise is different at different points of the frequency, and the threshold signal-to-noise ratio is constant, and similar thresholds are reserved for signal to noise of all subchannels; however, due to the fact that a significant crosstalk occur only in some frequency bands, too high signal/noise will cause the waste of bandwidth on the transmission line in the frequency bands where the influence of crosstalk is relatively small.

The second solution is called smooth adaptation speed (seamless rate adaptation, SRA). When the ratio signal/noise in the line is meniaetsa due to the influence of crosstalk, the decision of the SRA maintains the signal-to-noise ratio by reducing the number of modulated bits to subcarriers subjected to interference, so that the frequency of the transmission error rate does not exceed a certain target value. According to this decision, the bit allocation can be adjusted automatically according to the intensity distribution of the noise, which avoids the disadvantage of the first solution. However, when using SRA will need to calculate and update a table of bits and tables gains for subcarriers (in the case of communication with a lot of bearing - bit allocation table and the table of the correction gain for the subcarriers, see standard ADSL or VDSL approved ITU-T), and the amount of data is very large. This solution guarantees a lower reaction rate due to bandwidth limitations of the channel during the transmission of additional data. On the other hand, crosstalk from adjacent lines can suddenly increase at the beginning of the negotiation, and then to complete the adjustment of the transceiver will require renegotiation due to several consecutive unsuccessful attempts. In addition, when using SRA between the receiving and transmitting devices need to transmit a lot of data (tables bits and odds Wuxi is possible). The ratio signal/noise in the channel can be reduced, and the process of updating the tables of bits and gains may fail because of errors.

The third solution in the standard ITU-T G.993.2 (also called VDSL2) implements the concept of a virtual noise (virtual noise, VN), which represents noise, obtained by a specific process of formation. Figure 1 shows the relationship between the virtual and the real hustle: the dashed line shows the change of the virtual noise, a solid line curve shows the change in the real noise. Such virtual noise is used to calculate the signal-to-noise ratio, this calculates the bit load of each of the subcarriers on the basis of VN is determined by the line speed. If the corresponding VN will be set no lower than the maximum possible noise crosstalk in the base set of lines in the cable (for example, for the base set of 25 pairs in the case of VDSL VN shall not be less than crosstalk generated by the simultaneous activity of 24 pairs of lines), then for a pair of 1 will not require re-approval, even if these pairs will be agreed after the pair 1 reaches operating mode (showtime) (this term is used in this standard, a similar term - working state). In addition, due to the use of noise having a certain shape on the quite a number of threshold values is reserved only for the necessary sub that allows you to avoid unnecessary costs easy installation constant target threshold signal-to-noise ratio. However, this solution is conservative for the following reason. To guarantee VN shall be designed taking into account the maximum possible noise crosstalk, for example, 1% in the worst case. In practice, however, crosstalk are not always as significant or reach the level of the worst situation for a very short period of time, so the decision of the permanently functioning in such a conservative mode, still inherent in wasted bandwidth.

Disclosure of inventions

The problem to which the present invention is directed is to provide a method and system for communication on the digital subscriber line. The transmission rate can be adjusted depending on the change of the noise in the line, which can be increased robustness to noise, to avoid various problems (such as disconnection)caused a significant increase in noise in the line. In particular, the method and system are applicable in cases when the noise dramatically and increases significantly in a short time. While reducing the level of noise in the line, the line speed can be dynamically increased, is increasing the bandwidth of the communication line.

In the embodiment, the present invention describes a method of communication on the digital subscriber line, comprising the following steps: obtaining a parameter of efficiency of communication; the use of predefined rules first communication transceiver and the second transceiver in communication, if the parameter of efficiency of communication reaches or exceeds a predetermined value.

In the following embodiment, the present invention describes a transceiver for digital subscriber line, which includes the following components: a receiving module, configured to receive a signal from the subscriber line; a monitoring module, configured to obtain a parameter of efficiency of communication on the basis of a signal from the receiving module; a processing module, configured to perform switching according to a predetermined rule depending on parameter values the quality of the line coming from the monitoring module.

In the following embodiment, the present invention describes a system transceiver technology digital subscriber line, which includes the following components: a first transceiver and a second transceiver that communicates via the subscriber line.

First the transceiver receives a parameter of efficiency of communication, moreover, if the parameter of efficiency of communication reaches or exceeds a predetermined value, the first transceiver and the second transceiver when performing communication using a predefined rule.

According to variants of implementation of the present invention, pre-defined table of bits and a table of gain, and a predefined table of bits and the table, the gains are respectively stored in the first transceiver and the second transceiver; alternatively determined by the evaluation rule, which can be interpreted and used by the first transceiver and the second transceiver. With the emergence of a large broadband noise (e.g., crosstalk) is a rapid transition from the current table bits table and gain table bits and the table, the gains are determined in advance using a simple message or mechanism "request-response", or on the basis of the current table of bits and a table of gain is calculated, a new table of bits and a table of gain according to the rule defined in advance, after which there is a rapid transition to a new table bits and the table of gain. It does not require the sharing tab is Izumi bits and tables of gain between the first transceiver and the second transceiver, therefore, the solution according to the variants of implementation of the present invention have advantages in fast transition and high reliability. By reducing the specified broadband noise (for example, a user of the source crosstalk turned off the modem) can be calculated threshold SNR for the current channel, and the completeness of the frequency spectrum can be increased by increasing the speed through the SRA.

Brief description of drawings

Figure 1 shows the approximate relationship between the virtual and the real noise;

figure 2 presents the diagram of the receiving system according to a variant implementation of the present invention;

3 shows the curve of the ratio between the noise in the line, the threshold signal-to-noise ratio and speed of the communication line according to one variant of implementation of the present invention;

figure 4 presents the schema of the request message and response message according to one variant of implementation of the present invention;

figure 5 shows the process of exchange "request-response" between the first transceiver and the second transceiver according to one variant of implementation of the present invention;

figure 6 is a diagram for the case of a failure in the process of exchange "request-response" between the first transceiver and the second transceiver according to one variant of implementation of nastoyascheevremya;

figure 7 shows the scheme of navigating between tables bits using exchange process "request-response" between the first transceiver and the second transceiver according to one variant of implementation of the present invention.

The implementation of the invention

For a more clear and concise description of the meaning and implementation of the present invention by experts in the field of technology the following is a variant of implementation of the present invention with reference to the figures of the drawings.

As shown in figure 2, in one embodiment, the present invention describes a system transceiver technology digital subscriber line, which includes the following components: a first transceiver configured to obtain a parameter of efficiency of communication; a second transceiver configured to obtain a parameter of efficiency of communication. When the parameter of efficiency of communication reaches or exceeds a predetermined value, the first transceiver communicates with the second transceiver according to a predefined rule, which is described in the first transceiver, or on the basis of the parameters in the table of bits and the table, the gains are calculated taking into account the actual noise. Similarly, when setting performance and communication reaches or exceeds a predetermined value, the second transceiver communicates with the first transceiver according to a predefined rule, which is described in the second transceiver, or on the basis of the parameters in the table of bits and the table, the gains are calculated taking into account the actual noise.

The configuration and operation of the first transceiver similar to the configuration and operation of the second transceiver. One of them can be placed on the side of the PBX, and the other on the side of the subscriber. The transceivers include the following components: a receiving module, configured to receive signals and messages from the transceiver on the other side; a monitoring module, configured to obtain a parameter of efficiency of communication on the basis of the analysis, including the effectiveness of communication includes the signal-to-noise threshold signal-to-noise ratio and the frequency of erroneous bits; a processing module, configured to perform switching predefined rules of communication depending on the setting of the effectiveness of the communication received from the monitoring module, and generate the message and make the transition to a predefined rule according to the passage, and a predefined rule includes a table of bits and/or a table of gain; transmitting the module, configured to transmit a signal and message transition generated by the processing module, the transceiver on the other side.

The processing module includes the following components: a storage module configured to store tables of bits and tables gains, respectively, according to two rules links, tables, bits and tables, the gains are calculated on the basis of real noise, and some configuration parameters, such as the transition to change tables bits and tables amplification (bi and gi)that are defined based on the frequency of erroneous bits or threshold signal-to-noise ratio; an assessment module configured to determine, has reached or exceeded if the parameter of efficiency due predefined value; if the parameter of efficiency of communication has reached or exceeded predetermined value, the module generates a message of transition and transmits messages move to the remote side through the transmitting module waits for a sync signal from the remote side and initiates the transport module, if the synchronization signal received from the remote side within a predetermined time; a transport module configured to navigate to a predefined table of bits and a predetermined table of gain.

Priemer the sensors also include the following components: adapter smooth speed changes, configured to calculate a table of bits, and a table of gain on the basis of real noise and use them as a new rule to increase speed while reducing noise. The receiving module is also configured to receive a table of bits, and a table of gain sent to the remote party, and the transmitting module is also configured to provide a table of bits, and a table of gain to the remote side.

In embodiments implementing the present invention also discloses a method of communication on the digital subscriber line, comprising the following steps: obtaining a parameter of efficiency of communication; assessment reaches or exceeds whether the parameter of efficiency due predefined value; if the parameter of efficiency of communication reaches or exceeds a predetermined value, the notification of the transceiver on the remote side through messages and application parameters in a predefined table of bits and a predetermined table of gain transceivers on both sides in the implementation of communication; if the parameter is the efficiency of the communication does not reach and not exceed a predetermined value, the exercise of the options in the table of bits and a predetermined table of gain Vici is certain on the basis of real noise, when making connection.

With the aim of obtaining the parameters of the efficiency of communication, the monitoring module continuously monitors the signal received by the receiving module, and measures the efficiency of communication, such as signal-to-noise ratio, the threshold signal-to-noise ratio and the frequency of erroneous bits in the received signal, and informs the transceiver on the remote side, if one or more of these parameters reach or exceed a predefined value. In this case, the transceivers on both sides in the implementation of communication used parameters in the predefined table of bits and a predetermined table of gain.

After receipt of efficiency parameter link assessment module determines reaches or exceeds whether the parameter of efficiency due predetermined value. If the parameter of efficiency of communication reaches or exceeds a predetermined value, the transceiver on the remote side is notified through a message, after which the transceivers on both sides of the command to use parameters in a predefined table of bits and a predetermined table of gain while communicating. If the parameter of efficiency of communication does not reach and not exceed a predetermined value, the transceivers on both when the parties the command to use parameters in the table of bits and the table of gain, calculated on the basis of real noise when making connection.

For assessment reaches or exceeds whether the parameter of efficiency due predetermined value at the first transceiver (it is assumed that the first transceiver is placed on the side PBX) before approval can be pre-set to calculate the virtual noise or experimental table of bits signal-to-noise ratio and/or the frequency threshold error rate. Parameter calculations the experimental table bits is the bit number allocated from the bit value calculated on the basis of real noise with the aim of obtaining the bit number of the threshold signal-to-noise ratio for each tone (band podcasty)when this parameter is set computing virtual noise or experimental table of bits signal-to-noise ratio and/or the threshold frequency of erroneous bits is stored in the module storing the first transceiver. The parameter calculating virtual noise or experimental table of bits signal-to-noise ratio and/or the threshold frequency of erroneous bits is sent to the second transceiver (it is assumed that the second transceiver is placed on the side of the subscriber during the exchange of information in the reconciliation process, and the parameter calculation virtual noise or experimental table bits, signalscan and/or frequency threshold error rate is maintained at the second transceiver in the module storage. In the process of negotiation processing module of the second transceiver calculates two sets of tables of the signal to noise ratio, bits table and the table of gains, respectively, on the basis of a preset parameter calculating virtual noise or experimental table bits and real noise: SNRvi, Bvi and Gvi, and SNRri, bri and Gri, saves SNRvi, Bvi and Gvi, and SNRri, bri and Gri in the local storage module and transmits them to the first transceiver in the process of exchange of information for their conservation in the module storing the first transceiver. Then the first transceiver and the second transceiver establishes connection with the use of SNRri, bri and Gri, calculated on the basis of real noise.

The evaluation process also reaches or exceeds whether the parameter of efficiency due predetermined value, is as follows. The first transceiver and/or the second transceiver compare the monitored signal-to-noise threshold signal-to-noise ratio and the frequency of erroneous bits with a pre-defined thresholds stored in their storage modules. As an example, consider the control threshold signal-to-noise ratio; when it is detected that the thresholds of the signal-to-noise ratio for the multiple subcarriers (according to the power distribution crosstalk, in most cases, has set the consecutive subcarriers), for example, 10 subcarriers is smaller than the preset thresholds, which indicates a situation in which the coordination of adjacent pairs causes a sudden increase in crosstalk, the transceiver generates a request message of transition and sends this message to request transition to the transceiver on the remote side. After receiving a request message transition transceiver on the remote side goes to the table bits and tables gain calculated based on the calculation of the virtual noise or experimental bits table, and then returns a confirmation message and the synchronization message may be returned and only the synchronization message). After receiving a confirmation message and message synchronization transceiver reverts to using tables bits and tables, the gains are calculated based on the virtual noise. Thus, the first transceiver and the second transceiver can communicate using a table of bits, and a table of gain calculated based on the virtual noise.

Predefined table of bits and a predetermined table of gain can be obtained on the basis of a pre-installed virtual noise or can predstavljati an experimental table bits.

Virtual noise may be noise for the line with the highest level of crosstalk. Thus, during the negotiation, in addition to receiving the tables of the signal to noise SNRri, tables bits Bri and tables gain Gri-based real noise on the U-interface (interface between the xDSL transceiver and the external twisted pair), the first transceiver and the second transceiver also calculate other relevant data (SNRvi, Bvi and Gvi) based on a preset parameter calculating virtual noise or experimental table bits. The relationship table, the signal/noise SNRri, table bits Bri and table gain Gri contain, respectively, the signal-to-noise ratio, the number of bits and the relative factor correction gain for each subcarrier. (SNRvi, Bvi and Gvi) respectively stored in the storage modules of the first transceiver and the second transceiver. If the transceiver has detected that the signal / noise SNRi and/or the threshold signal / noise SNRMi and/or frequency error rate BER reaches or exceeds a preset value due to cross-interference with the approval of adjacent pairs, the transceiver transmits a request message for switching the transceiver on the remote side, the h is th transceiver on the remote side goes to the Bvi and Gvi, calculated based on the stored parameter calculating virtual noise or experimental table bits, and performs synchronous transition between the first transceiver and the second transceiver via a synchronization signal transition.

Experimental table bits can be obtained experimentally, for example, based on the measured distribution of crosstalk. By subtracting the corresponding bit value from a table of bits and gains Bri and Gri, based on the actual noise according to the result of the negotiation (the increase of the threshold signal-to-noise ratio caused deducted bit number must be greater than or equal to the decrease of the threshold signal-to-noise caused by cross-interference), it is necessary to build the virtual noise and transmit it to the remote side, and, thus, to further simplify the operation.

Table of bit loading and gain, calculated based on the virtual noise is sufficiently conservative solution, so the resulting speed is lower than in the case of the analysis of real noise, despite the fact that the threshold signal-to-noise ratio and the frequency of erroneous bits satisfies the requirement (typically meet or exceed required). Line speed can be gradually increased according to the actual is to whom SNRri. Respectively, can be performed rapidly decrease the speed to adapt to a sudden increase in noise, and slowly increase speed to implement the process of dynamically adjusting the noise reduction. The parameters of the line in the specified process, a rapid transition is calculated in advance and stored in the first transceiver and the second transceiver, so the transition can be implemented through simple messages and synchronization messages that are sent when you need to execute the transition. This process is much faster and more reliable than the original process SRA or BS, as in the case of SRA or BS must transmit the updated table of bits and a table of gain. In the case of SRA or BS, when the transfer table bits and tables amplification may fail due to bit errors during transmission, if the channel is of low quality. The solution according to a variant implementation of the present invention does not have such a drawback: when the crosstalk noise in the line is reduced, increasing the signal-to-noise ratio and decreases the frequency of erroneous bits that can be transferred to a large amount of data required for SRA.

During the transition to the operating state of the relationship table the signal/noise SNRri, tables bits Bri and tables of factors condition the population Gri, calculated on the basis of real noise, can be used as the transmission parameters in order to achieve higher transmission speed.

Figure 3 shows the curve of the ratio between the noise in the line, the threshold signal-to-noise ratio and speed of the communication line. On the x-axis in figure 3 represents time, the ordinate axis represents the ratio between the noise in the line, the threshold signal-to-noise ratio and speed of the communication line. At the time a negotiation begins adjacent pairs, which leads to a significant increase in noise in the line and a sharp drop in SNRM, therefore, according to a variant implementation of the present invention, at this point takes the user to a predefined table of bits and gains to reduce speed. During the period from time b to time c, when negotiating an adjacent pair of ends adjacent pair enters phase power control and reduce crosstalk, and, as a consequence, noise reduction in line with this SNRM increases. Thus, according to a variant implementation of the present invention, the speed can be adjusted by SRA to increase speed. During the period from point d to point e, when the subscriber adjacent pairs off the modem, crosstalk is significantly reduced, i.e. the noise in the line drops significantly, while SNRM increases. In affect, the, according to a variant implementation of the present invention, the speed can be adjusted by SRA to increase speed.

For the implementation of embodiments of the present invention also describes a transfer message. The standard for VDSL2 (ITU-T G.993.2) describes the message eoc (embedded overhead channel, embedded control channel) for the team OLR. Field type commands (00000001)2index 2 indicates a binary value, the remaining fields are defined in the following tables.

NameLength (octets)The number of octetsContent
20416(NOTE)
3 to 42 changing octet for the number of subcarriers Nf
Query type 15+4xNf (Nf≤128)5 to 4+4×Nf4×Nfoctets that describes the parameter field for each subcarrier subcarrier
5+4×Nf1 octet for SC
Query type 2For later use20516(NOTE)
OtherReserved ITU-T
Request type 3For later use20616(NOTE)
OtherReserved ITU-T
Note - all other values for octet 2 are reserved by ITU-T

X
Table 11-7/G.993.2
Reason codes for response OLR
The reasonThe value of the octetApplicable for delay (type 1)Applicable for failure (type 2)Applicable for refusal (type 3)
Busy0116XXX
Incorrect parameters0216XX

According to the above table, use type 1; according to a variant implementation of the present invention may be used for type 2 or type 3. The length field is set to 2 octets, and the content of the second octet, respectively: 0516, 0616(according to table), where the index 16 indicates a hexadecimal value. Can be defined another type of message (4), its length is 2 octets, the second octet 0716. Thus, the current standard is not affected. In addition, the following table shows the format of the response message corresponding to the message transfer.

NameLength (octets)The number of octetsContent
Delay28116(NOTE)
Query type 13
31 octet for reason code (table 11-7)
Failure28216(NOTE)
Query type 23
31 octet for reason code (table 11-7)
Failure28316(NOTE)
Request type 33
31 octet for reason code (table 11-7)
28V16(NOTE)
IACK3
31 octet for SC
Note - all other values for octet 2 are reserved by ITU-T

Thus, if you use an existing type 2 or type 3, appropriate for the messages I change. The length of the message, confirming the transition is 2 octets, where the second octet is set to 7216or 7316(according to message type). The length of the message, deflecting the transition is 3 octets, where the second octet has a value of 8216or 8316(according to message type), the third octet contains the reason for the rejection (alternatively, if the cause is not required, the length is 2 octets). The length of the message confirming the transfer, in the case of a newly defined type 4 (determined by the type of response 4) is 2 octets, where the second octet has a value of 7316and the message that rejects the transition is 3 octets, where the second octet has a value of 8316the third octet contains the reason for the rejection (alternatively, if the cause is not required, the length is 2 octets). The synchronization signal based on the signal, defined in the standard G.993.2, i.e. the synchronization signal is represented by transitions between combinations of "all-0 and all-1" in synchronization symbols.

According to the above method, the messages have increased capacity, and, thus, can facilitate the interaction between the two parties. To increase the speed of the transition request message transition of type 2, 3 or 4 can be transmitted without acknowledgement, then the transceiver performs the operation after receiving this is about the message, and passes on the receiving side the instruction on execution of transition through the synchronization symbols. In case of rejection of the synchronization message is not transmitted. Thus, it is not in the process of transmission and analysis of message content, which improves the speed of the transition and reduce the likelihood of errors.

According to the above variant implementation, during the negotiation of the pre-computed two sets of parameters, where one set includes a table of bits, and a table of gains obtained on the basis of setting of the current channel (e.g., channel noise), the other set includes conservative table of bits and a table of gain obtained based on the virtual noise or calculated experimental table bits. These two sets of parameters are stored simultaneously in the first transceiver and the second transceiver. After approval, the transceiver uses a table of bits, and a table of gains obtained according to the setting of the current channel and called the current table of bits and a table of gain, and this table of bits and a table of gain is dynamically adjusted according to changes in the channel (e.g., sharing bits). When a very large broadband what about the noise (for example, crosstalk) there is a rapid transition from the current table bits table and gain table bits and the table of the gain corresponding to the virtual noise through simple messages. Because there is no need to exchange tables bits and tables of gain, and exchanged only a simple message, compared to exchange bits of the solution according to the variants of implementation of the present invention have advantages in high-speed transition and high reliability. When the above-mentioned reduction of broadband noise (for example, a user of the source crosstalk turned off the modem), can be calculated SNRM for the current channel, and the completeness of the frequency spectrum can be increased by increasing the speed through the SRA.

In addition, due to the high speed of transition in solutions according to a variant implementation of the present invention, it is possible to prevent disconnections by the appropriate response to the phenomenon of sudden burst of crosstalk. If SRA is quite possible crashes caused by speed of response and errors in the process of exchange of parameters that leads to a re-negotiation and termination services.

To obtain the parameter of efficiency of communication can be adopted following mode "request-response". In the lastnosti, the result of the process "request-response" is defined as the line. A method of obtaining a quality line "request-response" as follows.

As shown in figure 4, generates a request message and a response message. Figure 4(a) shows the request message, figure 4(b) shows the response message. It is assumed that the first transceiver transmits the request message to the second transceiver.

If the counter in the request message received by the second transceiver, equal to X (X is in the range 0-255), a message is immediately generated response, and octet count in the response message must be X+1. If overflow occurs, the value of the octet counter is set to zero. When the first transceiver receives the response message, and if the contents of the octet count is correct, at the expiration of the time interval (T) is sent to the request message, and the contents of the octet counter matches the contents of a valid octet count received from the second transceiver. Further, the process is similar to the above. Figure 5 shows the process of exchange "request-response" between the first transceiver and the second transceiver.

As shown in Fig.6, if the second transceiver does not receive a valid request message from the first transceiver, the second transceiver is not about who follows him. If the first transceiver does not receive a valid response message from the host, the first transceiver will continuously repeat the transmission of the request message is identical to the previous in the specified time.

To record the process "request-response" in the first transceiver and the second transceiver may be a register, the bits which respectively reflect the state obtain n consecutive messages. To simplify the description of the registers in the first transceiver and the second transceiver are marked respectively TM and RM. After initialization, or modify the records in the table bits of the initial value TM and RM must be zero.

For the first transceiver, within the current time frame: the first transceiver writes '1' in the current bit TM, if not received the correct response message within a prescribed time interval, and '0'if within the prescribed time interval received a valid response message. Then the first transceiver receives the response message within the next time frame, sets the next bit TM as the current bit and writes '1' in the current bit TM, if not received the correct response message within a prescribed time interval, and '0'if within the prescribed time interval is Yeni received a valid response message.

For the second transceiver, within the current time frame: second transceiver writes '1' in the current bit RM, if not obtained a valid request message within a prescribed time interval, and '0'if within the prescribed time interval received a valid request message; then the second transceiver receives the request message within the next time frame, sets the next bit RM as the current bit and writes '1' in the current bit RM, if not obtained a valid request message within a prescribed time interval, and '0'if within the prescribed time interval received a valid request message.

In the first transceiver when a predefined number (i.e. transition) bits in the register TM is set to '1', the decision to do the conversion at a time mutually agreed upon by the first transceiver and the second transceiver; for example, changing tables bits and tables amplification is performed on the tenth character of the next frame sync. To ensure the simultaneous transition, after the decision on the transition continues transmission of incorrect data, then the second transceiver reaches a state of transition as quickly as possible, and, thus, changing tables bits and tables, the amplification is performed on the tenth character of the next frame sync. Thus, is a synchronous change table bits without having to send the message, the transition between the first transceiver and the second transceiver that allows you to troubleshoot various problems, such as disconnections caused by the sudden burst of noise in the line (for example, cross-interference). The same mechanism is used when performing change table bits at the second transceiver.

7 shows an example of a process of "request-response", according to which the TM and RM contain 5 bits, the threshold of the transition is equal to 3. 7 solid line denotes the correct transmission of the current message, the dashed line shows the incorrect transmission of the current message. In the first time frame of the first transceiver transmits a request message containing the octet counter 001, the second transceiver; after receiving the request message, the second transceiver returns a response message containing the octet counter 002, the first transceiver. At this time, the bits in the TM and RM of the first transceiver and the second transceiver does not change, i.e. they are all set to 0. In the second time frame TM and RM, respectively cyclically shifted by one bit forward, the first transceiver transmits a request message containing the octet counter 002, the second transceiver; the second prempreeda the IR does not receive the request message, but, nevertheless, returns a response message containing the octet counter 002, the first transceiver. At this time, the current bit (the last bit, as shown in Fig.) in TM and RM of the first transceiver and the second transceiver is set to 1. In the third time frame TM and RM, respectively cyclically shifted by one bit forward, the first transceiver transmits a request message containing the octet counter 002, at the second transceiver, and after receiving the request message, receiving at the second transceiver is correct, the current bit in the RM of the second transceiver stores the value 0, then the second transceiver returns a response message containing the octet counter 003, the first transceiver. The first transceiver does not receive a response message within a prescribed time interval, therefore, the current bit in the TM of the first transceiver is set to 1. Similarly, upon reaching the 7th frame number of values '1' (transition) in the TM of the first transceiver reaches 3 and 8-th frame, the first transceiver transmits the second transceiver, the request message containing the invalid octet counter, then the number of values '1' in the RM of the second transceiver reaches the threshold of the transition as quickly as possible to run change tables bits in the tenth symbol of the trail is the future of the frame synchronization. The need for re-transfer of messages between the first transceiver and the second transceiver is absent, respectively, simultaneous change tables bits, and decisions according to variants of implementation of the present invention realize the advantages in fast transition and high reliability. By reducing the specified broadband noise (for example, a user of the source crosstalk turned off the modem) can be calculated SNRM for the current channel, and the completeness of the frequency spectrum can be increased by increasing the speed through the SRA.

When performing a change table bit changing table gain can run or not run.

General principles: pre-defined table of bits and a table of gain, and built a table of bits, and a table of gain respectively stored in the first transceiver and the second transceiver. With the emergence of a large broadband noise (e.g., crosstalk), is a rapid transition from the current table bits table and gain table bits and the table, the gains are determined in advance using a simple message or mechanism "request-response", or on the basis of the current table bitove table gain is calculated, a new table of bits and a table of gain according to the rule defined in advance, after which there is a rapid transition to a new table bits and the table of gain. It does not require the exchange of tables bits and tables of gain between the first transceiver and the second transceiver, so the solution according to the variants of implementation of the present invention have advantages in fast transition and high reliability. By reducing the specified broadband noise (for example, a user of the source crosstalk turned off the modem) can be calculated SNRM for the current channel, and the completeness of the frequency spectrum can be increased by increasing the speed through the SRA.

The present invention has been described in connection with the implementation, however, the specialist in the art will understand that various modifications and changes of the present invention without departure from its scope or context, and the scope of the present invention is determined in accordance with paragraphs appended claims

1. The way of communication for digital subscriber line, comprising the following steps:
receiving by the first transceiver parameter of efficiency of communication;
using the first transceiver predetermined communication rules together with the second priemer the sensor for communicating with a second transceiver in the event that when the parameter of efficiency of communication reaches or exceeds a predetermined value;
the implementation of the first communication transceiver to the second transceiver based on the parameters contained in the table of bits and the table, the gains are calculated taking into account the actual noise, if the parameter of efficiency of communication does not reach or exceed a predetermined value,
moreover, the predefined rule comprises at least one of the predefined table of bits and a table of gain.

2. The method according to claim 1, characterized in that
predefined rule determine in advance on the first transceiver or create in the course of communication according to a predetermined calculation method of communication rules.

3. The method according to claim 1, characterized in that the step of obtaining the parameter of efficiency of communications includes monitoring a parameter of efficiency of communication, including the effectiveness of communication includes at least one of the following: signal-to-noise ratio, the threshold signal-to-noise ratio, the frequency of erroneous bits.

4. The method according to claim 3, characterized in that when the parameter of efficiency of communication reaches or exceeds a predetermined value, the first transceiver transmits a request message to a transition to the second transceiver and the part is no use predefined rule when communicating with the second transceiver.

5. The method according to claim 4, characterized in that it further includes the following step: the first transceiver receives the response message sent by the second transceiver, implemented through an official channel.

6. The method according to claim 4, characterized in that it further includes the following step: application of symbol synchronization for synchronous transition of the first transceiver and the second transceiver.

7. The method according to claim 1, characterized in that it further includes the following step: receiving the parameter of efficiency of communication through the mechanism of the "request-response".

8. The method according to claim 7, characterized in that it further includes the following steps:
sending a request message to the first transceiver in a specified time frame and receiving a reply message from the second transceiver;
the parameter definition of effectiveness communication the first transceiver according to the received response message.

9. The method according to claim 1, characterized in that it further includes the following step:
the usage parameter in the predefined table of bits of the first transceiver for communication at a predetermined time, if the parameter is the efficiency of the communication received by the first transceiver has reached or exceeds a predetermined value.

10. the procedure according to claim 9, wherein the predetermined time point in the tenth symbol of the next frame sync.

11. The method according to claim 1, characterized in that the predefined bits table is a table of bits or experimental table of bits calculated on the basis of virtual noise.

12. A transceiver for digital subscriber line, which includes the following components:
a receiving module, configured to receive signals from the subscriber line;
a monitoring module, configured to obtain a parameter of efficiency of communication based on the received signal;
processing module, configured to perform a transition to a predetermined rule according to the parameter of efficiency of communication coming from the monitoring module, in the case when the parameter of efficiency of communication does not reach or exceed a predetermined value, and communicate with the second transceiver based on the parameters contained in the table of bits and the table, the gains are calculated taking into account the actual noise in the case when the parameter of efficiency of communication reaches or exceeds a predetermined value, and with the possibility to use predefined rules of communication for communicating with the second transceiver when the eat the predefined rule includes at least one of the predefined table of bits and a table of gain.

13. The transceiver according to item 12, wherein the processing module includes the following components:
a storage module, configured to store a predefined rule;
module assessment opportunity assessment met or exceeded if the parameter of efficiency due predefined value, and if the parameter of efficiency of communication has reached or exceeds a predetermined value, the specified module activates the transport module;
the transport module made with the possibility of transition to a predefined rule.

14. The transceiver according to item 12, wherein the transceiver additionally includes adapter smooth speed changes, configured to calculate a table of bits, and a table of gains based on the current real noise.

15. The transceiver according to item 12, wherein the transceiver further comprises a transmitting module, configured to send the table of bits and a table of gain to the remote side.

16. Communication system for digital subscriber line, comprising a first transceiver and a second transceiver that communicates with the first transceiver via the subscriber line, and the first transceiver is configured to floor the expansion parameter of the effectiveness of communication of the signal, received from the second transceiver, with the possibility of communication with the second transceiver using predefined rules when setting the effectiveness of communication reaches or exceeds a predetermined value, and communicate with the second transceiver based on the parameters contained in the table of bits and the table, the gains are calculated taking into account the actual noise in the case when the parameter of efficiency of communication does not reach or exceed a predetermined value, and a predefined rule comprises at least one of the predefined table of bits and a table of gain.

17. The system of clause 16, wherein the first transceiver includes the following components:
a receiving module, configured to receive signals from the subscriber line;
a monitoring module, configured to obtain a parameter of efficiency of communication based on the received signal; a processing module configured to perform a transition to the communication using a predetermined communication rules, and predefined rule is stored on the local side.



 

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