WO2014059846A1

WO2014059846A1 - Method and device for fixing time delay

Info

Publication number: WO2014059846A1
Application number: PCT/CN2013/083804
Authority: WO
Inventors: 徐蔚峰; 沈绍清; 徐妍; 程文; 彭良川
Original assignee: 中兴通讯股份有限公司
Priority date: 2012-10-17
Filing date: 2013-09-18
Publication date: 2014-04-24
Also published as: CN103780328A; CN103780328B

Abstract

Disclosed are a method and device for fixing time delay. The method comprises the following steps: after receiving an adaptive coding and modulation (ACM) switching command, a sending end storing the residual value of the modulation mode before ACM switching and meanwhile taking out the residual value of the modulation mode after ACM switching, and performing ACM switching; after successfully performing ACM switching, the sending end sending the ACM switching command to a receiving end; and after receiving the ACM switching command, the receiving end storing the residual value of the modulation mode before ACM switching and meanwhile taking out the residual value of the modulation mode after ACM switching, and performing ACM switching. According to the present invention, residual value reservation and switching are performed when ACM switching is performed, namely it is guaranteed on time that link data enables the generated residual values to be consistent, so that during ACM switching, the fixed time delay during data transmission is guaranteed in case of not adding additional transmission time delay.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular, to a method and an apparatus for delaying a time delay. BACKGROUND OF THE INVENTION In a transmission network, delay jitter of data affects transmission. Especially for synchronous transmission networks, delay jitter and delay are the main evaluation parameters of network quality. Delay jitter is the change in delay. Delay jitter mostly originates from queues or buffers in the network, and its generation is random and inevitable. At present, the existing control transmission delay jitter generally utilizes the buffer capacity to resist jitter and delay data output. The specific principle is as follows: The data stream is buffered to a certain amount, and a data delay time is preset, and then output at a constant rate. The delay time is greater than or equal to the delay jitter deviation of the normal data transmission, and the delay jitter is resisted by the already stored data when the link traffic is small. At the same time, the buffer leaves a certain amount of storage space, and when the link has a large amount of traffic data, the cached spare capacity can be used to resist the delay jitter. The data is buffered in a delayed manner, so that the data is delayed after a certain period of time, thereby ensuring the fixed data delay. Although the above method is simple to implement, it is inevitable that the data delay is increased, and a buffer of a certain capacity is required. Moreover, for some networks (such as microwave networks), Adaptive Modulation and Coding (ACM) technology is used, and there are cases where different modulation modes are switched between each other. In this case, in order to match the rate of data transmission with the rate after modulation switching, the rate of the transceiver side needs to be adjusted. In the process of adjustment, the above method cannot guarantee the fixing of the data transmission delay. SUMMARY OF THE INVENTION The embodiments of the present invention provide a fixed delay scheme, which is intended to ensure the fixation of data transmission delay during adaptive coding and modulation switching. The embodiment of the present invention provides a method for fixing a delay, including the following steps: After receiving the ACM switching command, the transmitting end stores the remaining value of the previous modulation mode of the ACM switching, and simultaneously converts the latter modulation mode of the ACM switching. The remaining value is taken out, and ACM switching is performed; after the transmitting end performs ACM switching successfully, the ACM switching command is sent to the receiving end; After receiving the ACM switching command, the receiving end stores the residual value of the previous modulation mode of the ACM switching, and takes out the residual value of the latter modulation mode of the ACM switching, and performs ACM switching. Preferably, the ACM switching includes: setting a current modulation mode to a subsequent modulation mode of the ACM switching, and setting a parameter for enabling the generation rate to a parameter value corresponding to the latter modulation mode. Preferably, the residual value is a value of a clock counter or a frequency division counter used in generating a data read/write enable process. Preferably, the method further includes: receiving, by the receiving end, the residual value alignment information of the transmitting end; determining whether the residual value to be aligned by the residual value alignment information is a residual value in the current modulation mode, and then performing residual value compensation; The value is aligned with the residual value in the information for storage. Preferably, the performing the residual value compensation comprises: when receiving the first data bit of the transmission frame where the residual value alignment information is located, recording the current residual value of the receiving end; and receiving, by the receiving end, the transmission frame where the residual value alignment information is located, After receiving the current residual value of the transmitting end encapsulated in the transmission frame, the current residual value of the transmitting end is subtracted from the current residual value of the receiving end to obtain a compensation value, and the compensation value is received by the receiving end. After the current residual value of the sender is used, the generated residual values are summed and stored. The embodiment of the present invention further provides a fixed apparatus for delay, including a transmitting end and a receiving end, wherein: the sending end is configured to perform a residual value of a previous modulation mode of the ACM switching after receiving the ACM switching command. Storage, at the same time, the remaining value of the latter modulation mode of the ACM switching is taken out, and ACM switching is performed; after the ACM switching is successful, the ACM switching command is sent to the receiving end; the receiving end is set to receive the ACM switching sent by the transmitting end. After the command, the residual value of the previous modulation mode of the ACM switching is stored, and the residual value of the latter modulation mode of the ACM switching is taken out, and ACM switching is performed. Preferably, the sending end is further configured to: when the ACM switching is performed, set the current modulation mode to the latter modulation mode of the ACM switching, and set the parameter that enables the generation rate to the parameter value corresponding to the latter modulation mode; The receiving end is further configured to: when performing ACM switching, set the current modulation mode to the latter modulation mode of the ACM switching, and set the parameter that enables the generation rate to the parameter value corresponding to the latter modulation mode. Preferably, the residual value is a value of a clock counter or a frequency division counter used in generating a data read/write enable process. Preferably, the method further includes a residual value alignment module, wherein the residual value alignment module comprises: an alignment information receiving unit configured to receive the residual value alignment information of the transmitting end by the receiving end, and determine that the residual value alignment information is to be aligned Whether the residual value is the residual value in the current modulation mode; the first alignment unit is configured to perform residual value compensation when the residual value to be aligned in the residual value alignment information is the residual value in the current modulation mode; The quasi-unit is set to store the residual value in the residual value alignment information when the residual value to be aligned in the residual value alignment information is not the residual value in the current modulation mode. Preferably, the first residual value aligning unit is configured to: when the alignment information receiving unit receives the first data bit of the transmission frame where the residual value alignment information is located, record the current residual value of the receiving end; After receiving the current residual value of the transmitting end encapsulated in the transmission frame, the quasi-information receiving unit subtracts the current residual value of the transmitting end from the current residual value of the receiving end to obtain a compensation value, and obtains the compensation value and the receiving value. After receiving the current residual value of the sender, the terminal sums the residual values generated by the enabler and stores them. In the embodiment of the present invention, when the ACM is switched, the residual value is reserved and switched, that is, the residual value generated by the link data enable can be consistent in time, so that no additional transmission delay is added during the ACM handover process. In the case of the data transmission, the delay is fixed. In the embodiment of the present invention, the residual value is aligned, so that the residual values generated by the link data enable can be ensured at both ends of the transmission and reception, thereby further ensuring the fixed delay of the data transmission, thereby improving the data transmission efficiency. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic flow chart of an embodiment of a method for delay-fixing according to the present invention; FIG. 2 is a schematic flow chart of another embodiment of a method for delay-fixing according to the present invention; In the process of performing residual value compensation alignment; 4 is a schematic structural view of an embodiment of a device for delay-fixing according to the present invention; and FIG. 5 is a schematic structural view of another embodiment of a device for delay-fixing according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The technical solutions of the present invention will be further described below in conjunction with the drawings and specific embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In the embodiment of the present invention, when the ACM is switched between the transmitting end and the receiving end, the residual value generated during the enabling generation process is reserved and switched. That is, when the ACM is switched, the counter in the generation process is not continuously counted, and the reset operation is not performed, but the remaining value of the stored corresponding modulation method is used for switching. The residual value is used to generate the value counted by the clock counter or the divider counter during data read and write enable. If a counter is used in a plurality of different rate read/write enable generation processes, and the counters function the same, the residual value refers to the value of the counter in use at the current rate. In addition, the residual value has real-time performance, and the residual values at different times under the same counter are different. Thus a set of multiple residual values form a pool of residual values. The residual values in the set belong to different transmission modes, that is, the values of the counters at different read/write enable generation rates. Referring to Fig. 1, an embodiment of a method of delay fixing according to the present invention is proposed. The method for fixing the delay includes the following steps: Step S110: After receiving the ACM switching command, the transmitting end stores the residual value of the previous modulation mode of the ACM switching, and simultaneously removes the residual value of the latter modulation mode of the ACM switching. And performing ACM switching; step S120, after the transmitting end performs ACM switching successfully, sending an ACM switching command to the receiving end; Step S130, after receiving the ACM switching command, the receiving end stores the remaining value of the previous modulation mode of the ACM switching. At the same time, the residual value of the latter modulation mode of the ACM switching is taken out, and ACM switching is performed. If the current modulation mode is A and needs to be switched to the modulation mode B, an ACM switching command is initiated to perform ACM switching. After receiving the ACM switching command, the transmitting end overwrites the residual value of the current modulation mode A at the ACM switching time by the residual value of the original modulation mode A in the residual pool of the transmitting end; and simultaneously extracts the modulation from the residual value pool of the transmitting end. The residual value corresponding to the mode B is used as the value of the counter used in the process of generating the rate in the modulation mode B after the switching. After the sender performs the ACM handover successfully, the ACM handover command is sent to the receiver. When the receiving end receives the ACM switching command, the remaining value of the modulation mode A switching time may be overwritten by the residual value of the original modulation mode A in the residual value pool of the receiving end; and the corresponding mode of the modulation mode B is taken out from the residual value pool of the receiving end. The residual value is used as the value of the counter used in the process of generating the rate in the modulation mode B after switching. When the modulation mode is switched back to modulation mode A, the residual value is switched and retained. It should be understood that when performing ACM switching, The moment of handover is always performed at the beginning of a frame transmission, to ensure that each complete frame is performed by the same read/write rate. This ensures that the switching between each modulation mode enables the generation of relative synchronization alignment. Furthermore, it is ensured in time that the enabling times of the transmitting and receiving ends are the same. The method for delay-fixing in the embodiment of the present invention performs the retention and switching of the residual value when the ACM is switched, that is, the residual value generated by the link data enable can be consistent in time, so that during the ACM handover process, When additional transmission delay is added, the delay of data transmission is guaranteed to be fixed. Further, the ACM switching includes: setting a current modulation mode to a subsequent modulation mode of the ACM switching, and setting a parameter for enabling the generation rate to a parameter value corresponding to the latter modulation mode. During the ACM switching process, when the modulation mode is switched, the parameters that enable the rate generation will also be reconfigured. For example, the parameter that enables the rate of generation in modulation mode A is clock frequency division, and the frequency division ratio is S1. The parameter that enables the rate of generation in modulation mode B is also divided by clock, but the frequency division ratio is S2, so When the modulation method A is switched to the modulation mode B, the parameter that enables the rate generation (that is, the clock division) is S2. Further, referring to Fig. 2, another embodiment of the method of delay fixing of the present invention is proposed. The method for delaying the delay of the embodiment further includes: Step S140: The receiving end receives the residual value alignment information of the transmitting end; the residual value alignment is to ensure that the residual values of the transmitting end and the receiving end are consistent, and the residual value alignment may be The modulation mode is executed immediately after the switching, and may also be performed at some time after the modulation mode is switched, which may be set according to different situations. Moreover, the operation object aligned with the residual value may be a residual value in the current modulation mode, or may be other residual values in the residual value pool, and may also be correspondingly set according to a specific situation. The residual alignment information may be in the form of a data transmission frame carrying a residual value that needs to be aligned. The residual value alignment information may further include a flag to indicate the residual value of the modulation mode that needs to be aligned: whether it is the residual value in the current modulation mode, or some other modulation mode in the residual value pool. The residual value. Step S150, determining whether the residual value to be aligned by the residual value alignment information is the residual value in the current modulation mode, if yes, proceeding to step S160; otherwise, proceeding to step S170; determining according to the flag in the residual value alignment information The residual value that needs to be aligned is the residual value in the current modulation mode, or the residual value in other modulation modes in the residual value pool. Step S160, performing residual value compensation; When the residual value to be aligned is the residual value in the current modulation mode, due to the real-time nature of the residual value, when the residual value is aligned, it needs to be compensated for the residual value to ensure the residual value at both the transmitting end and the receiving end. be consistent. Step S170: storing the residual value in the residual value alignment information. When the residual value to be aligned is the residual value in other modulation modes in the residual value pool, since the residual value does not change in the current standard mode, it is only necessary to replace the residual value in the residual value. The residual value in the original modulation mode in the value pool ensures that the residual values at the sender and receiver ends are consistent. It should be understood that since the residual value does not change in the current system mode, the residual value alignment information may be transmitted from the transmitting end to the receiving end in the form of a separate framing. Further, referring to FIG. 3, the foregoing step S160 includes: Step S161: When receiving the first data bit of the transmission frame where the residual value alignment information is located, record the current residual value of the receiving end; before the step S161, the transmitting end sends the remaining When the value is aligned with the first data bit of the transmission frame where the information is located, the residual value R1 of the current transmitting end is recorded, and then the residual value R1 is encapsulated into the N+dth data bit of the transmission frame to form residual value alignment information. The residual alignment information is then sent to the receiving end. When the receiving end receives the first data bit of the transmission frame in which the residual value alignment information is located, the current residual value R2 of the receiving end is recorded. Step S162: The receiving end receives the transmission frame where the residual value alignment information is located, and after receiving the current residual value of the transmitting end encapsulated in the transmission frame by the transmitting end, the current residual value of the transmitting end and the current residual of the receiving end are received. The value is subtracted to obtain the compensation value, and the compensation value is summed with the residual value generated by the receiving end after receiving the current residual value of the transmitting end, and is compensated. In the process of receiving the transmission frame in the residual value alignment information, the receiving end receives the encapsulated in the transmission frame

When the residual value R1 in the N+d data bits is subtracted, the residual value R1 is subtracted from the residual value R2 to obtain the residual value compensation R0=R1-R2, and the N+d+1th data bit data is generated at the receiving end. When possible, the residual value compensation R0 is added to the counter generated by the receiving end enable. The above data bits may be in units of bytes or in units of bits. Wherein the value of N is less than the frame length of the transmission frame, and d is the number of data bits occupied by the residual value information in the transmission frame. The time used by the residual value alignment method may be performed in one frame at the beginning of the residual value switching, or may be performed in several frames after the switching, and may also be set correspondingly according to the specific situation. The method for delay-fixing in the embodiment of the present invention ensures that the residual values generated by the link data enable are consistent before and after the ACM switching and both ends of the ACM, thereby further ensuring that the delay of the data transmission is fixed, thereby improving Data transmission efficiency. Referring to Fig. 4, a schematic structural view of an embodiment of a fixing device for delay of the present invention is proposed. The fixed device of the delay includes a transmitting end 100 and a receiving end 200, wherein: the transmitting end 100 is configured to store the remaining value of the previous modulation mode of the ACM switching after receiving the ACM switching command, and simultaneously switch the ACM. The remaining value of the latter modulation mode is taken out, and ACM switching is performed; after the ACM switching is successful, the ACM switching command is sent to the receiving end 200; the receiving end 200 is set to receive the ACM switching command sent by the transmitting end 100, The remaining value of the previous modulation mode of the ACM switching is stored, and the residual value of the latter modulation mode of the ACM switching is taken out, and ACM switching is performed. If the current modulation mode is A and needs to be switched to the modulation mode B, an ACM switching command is initiated to perform ACM switching. After receiving the ACM switching command, the transmitting end 100 overwrites the residual value of the current modulation mode A at the ACM switching time by the residual value of the original modulation mode A in the residual pool of the transmitting end; and simultaneously extracts the modulation from the residual value pool of the transmitting end. The residual value corresponding to the mode B is used as the value of the counter used in the process of generating the rate in the modulation mode B after the switching. After the transmitting end 100 performs the ACM switching successfully, the ACM switching command is sent to the receiving end 200. When receiving the ACM switching command, the receiving end 200 covers the residual value of the current modulation mode A at the ACM switching time by the residual value of the original modulation mode A in the residual value pool of the receiving end; and simultaneously extracts the modulation mode from the residual value pool of the receiving end. The residual value corresponding to B is used as the value of the counter used in the process of generating the rate in the modulation mode B after the switching. When the modulation mode is switched back to modulation mode A, the residual value is switched and retained. It should be understood that when performing ACM switching, the time of switching is always performed at the beginning of one frame transmission of the link to ensure that each complete frame is performed by the same read/write rate. This ensures that the switching between each modulation mode enables the generation of relative synchronization alignment. Furthermore, it is ensured in time that the enabling times of the transmitting and receiving ends are the same. In the embodiment of the present invention, the delay fixed device performs the retention and switching of the residual value when performing ACM switching, that is, the residual value generated by the link data enable can be consistent in time, so that during the ACM switching process, When additional transmission delay is added, the delay of data transmission is guaranteed to be fixed. Further, the transmitting end 100 is further configured to: when performing ACM switching, set a current modulation mode to a subsequent modulation mode of the ACM switching, and set a parameter that enables the generation rate to a parameter value corresponding to the latter modulation mode; The receiving end 200 is further configured to: when performing ACM switching, set the current modulation mode to the latter modulation mode of the ACM switching, and set the parameter that enables the generation rate to the parameter value corresponding to the latter modulation mode. Further, referring to FIG. 5, the foregoing delay fixing apparatus further includes a residual value alignment module 300, wherein the residual value alignment module 300 includes: an information receiving unit 310 configured to receive the residual value alignment information of the transmitting end, and Determining whether the residual value to be aligned by the residual value alignment information is a residual value in the current modulation mode; the first aligning unit 320 is set to be the remaining value to be aligned in the residual value alignment information under the current modulation mode When the residual value is used, the residual value compensation is performed; the second aligning unit 330 is configured to align the residual value with the residual value in the information when the residual value to be aligned in the residual value alignment information is not the residual value in the current modulation mode. Store. The residual value alignment is to ensure that the residual values at the transmitting end and the receiving end are consistent. The residual value alignment may be performed immediately after the modulation mode is switched, or may be performed at some time after the modulation mode switching, which may be different according to different situations. And make the appropriate settings. Moreover, the operation object aligned with the residual value may be a residual value in the current modulation mode, or may be other residual values in the residual value pool, and may also be correspondingly set according to a specific situation. The residual alignment information may be in the form of a data transmission frame carrying a residual value that needs to be aligned. The residual value alignment information may further include a flag to indicate the residual value of the modulation mode that needs to be aligned: whether it is the residual value in the current modulation mode, or some other modulation mode in the residual value pool. The residual value. After receiving the residual value alignment information, the alignment information receiving unit 310 determines, according to the flag in the residual value alignment information, whether the residual value to be aligned is the residual value in the current modulation mode, or other modulation mode in the residual value pool. The remainder of the value. According to the judgment result, different residual value alignment methods are used to align the same, so as to ensure that the residual values at both ends of the transmission and reception are consistent. Further, the first aligning unit 320 is configured to: when the information receiving unit 310 receives the first data bit of the transmission frame where the residual value alignment information is located, record the current residual value of the receiving end; and at the information receiving unit 310 After receiving the current residual value of the transmitting end encapsulated in the transmission frame, the current residual value of the transmitting end is subtracted from the current residual value of the receiving end to obtain a compensation value, and the compensation value is received and sent by the receiving end. After the current residual value of the terminal is enabled, the generated residual values are summed and stored. When the transmitting end 100 sends the first data bit of the transmission frame where the residual value alignment information is located, the residual value R1 of the current transmitting end is recorded, and then the residual value R1 is encapsulated into the N+d data bits of the transmission frame, and the remaining data bits are formed. The value is aligned with the information. The residual value alignment information is then sent to the receiving end 200. When the information receiving unit 310 receives the first data bit of the transmission frame in which the residual value alignment information is located, the current residual value R2 of the receiving end 100 is recorded. In the process of receiving the transmission frame in which the residual value alignment information is located, if the information receiving unit 310 receives the N+d data bits encapsulated in the transmission frame When the residual value R1 is in the middle, the first aligning unit 320 subtracts the residual value R1 from the residual value R2 to obtain the residual value compensation R0=R1-R2, and generates the N+d+1th data bit data at the receiving end. When possible, the residual value compensation R0 is added to the counter generated by the receiving end enable. The device with fixed delay of the embodiment of the present invention ensures that the residual value generated by the link data is consistent before and after the ACM switching and the two ends of the ACM are switched, and the data transmission is further ensured. The delay is fixed, thereby improving the data transmission efficiency. It should be noted that the method and apparatus for delay fixing provided by the embodiments of the present invention can be applied to an adaptive code modulation (ACM) switching process. The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the patents. The equivalent structure or equivalent process transformations made by the description of the present invention and the drawings are directly or indirectly applied to other related technical fields. The same is included in the scope of patent protection of the present invention.

Claims

A claim for rights, a method of fixed time delay, including the following steps:

After receiving the adaptive code modulation ACM switching command, the transmitting end stores the residual value of the previous modulation mode of the ACM switching, and takes out the residual value of the latter modulation mode of the ACM switching, and performs ACM switching;

After the ACM is successfully switched by the transmitting end, the ACM switching command is sent to the receiving end; after receiving the ACM switching command, the receiving end stores the remaining value of the previous modulation mode of the ACM switching, and simultaneously switches the ACM to the latter modulation mode. The residual value is taken out and ACM switching is performed. The method of delay fixing according to claim 1, wherein the ACM switching comprises:

Set the current modulation mode to the latter modulation mode of ACM switching, and set the parameter that enables the rate to be set to the corresponding parameter value of the latter modulation mode. The method of delay fixing according to claim 1, wherein the residual value is a value of a clock counter or a frequency dividing counter used in generating a data read/write enable process. The method of delay fixing according to any one of claims 1 to 3, further comprising: receiving, by the receiving end, residual information of the transmitting end;

It is judged whether the residual value to be aligned by the residual value alignment information is the residual value in the current modulation mode, and then the residual value is compensated; otherwise, the residual value in the residual value alignment information is stored. The method of delay fixing according to claim 4, wherein the performing residual compensation comprises:

When receiving the first data bit of the transmission frame where the residual value alignment information is located, recording the current residual value of the receiving end;

The receiving end receives the transmission frame where the residual value alignment information is located, and after receiving the current residual value of the transmitting end encapsulated in the transmission frame by the transmitting end, subtracts the current residual value of the transmitting end from the current residual value of the receiving end. The compensation value is obtained, and the compensation value is summed with the residual value generated by the receiving end after receiving the current residual value of the transmitting end, and is compensated. A time delay fixing device, comprising a transmitting end and a receiving end, wherein:

The transmitting end is configured to store the residual value of the previous modulation mode of the ACM switching after receiving the adaptive code modulation ACM switching command, and simultaneously restore the residual value of the latter modulation mode of the ACM switching. Take out, and perform ACM switching; after successful ACM switching, send ACM switching command to the receiving end;

The receiving end is configured to store the remaining value of the previous modulation mode of the ACM switching after receiving the ACM switching command sent by the transmitting end, and simultaneously remove the residual value of the latter modulation mode of the ACM switching, and perform ACM switching. The apparatus for delay-fixing according to claim 6, wherein the transmitting end is further configured to: set the current modulation mode to the latter modulation mode of the ACM switching when performing ACM switching, and enable the generation rate The parameter is set to the corresponding parameter value of the latter modulation mode;

The receiving end is further configured to: when performing ACM switching, set the current modulation mode to the latter modulation mode of the ACM switching, and set the parameter that enables the generation rate to the parameter value corresponding to the latter modulation mode. The apparatus according to claim 6, wherein the residual value is a value of a clock counter or a frequency dividing counter used in generating a data read/write enable process. The apparatus for delay-fixing according to any one of claims 6-8, further comprising a residual value alignment module, wherein the residual value alignment module comprises:

The alignment information receiving unit is configured to receive, by the receiving end, the residual value alignment information of the transmitting end, and determine whether the residual value to be aligned by the residual value alignment information is a residual value in the current modulation mode;

The first aligning unit is configured to perform residual value compensation when the residual value to be aligned by the residual value alignment information is a residual value in the current modulation mode;

The second aligning unit is configured to store the residual value in the residual value alignment information when the residual value to be aligned by the residual value alignment information is not the residual value in the current modulation mode. 0. The apparatus according to claim 9, wherein the first residual value aligning unit is configured to: receive, by the alignment information receiving unit, first data of a transmission frame where the residual value alignment information is located When the bit is set, the current residual value of the receiving end is recorded; and after the alignment information receiving unit receives the current residual value of the transmitting end encapsulated in the transmitting frame by the transmitting end, the current residual value of the transmitting end and the current residual of the receiving end are The value is subtracted to obtain the compensation value, and the compensation value is summed with the residual value generated by the receiving end after receiving the current residual value of the transmitting end, and then stored.