WO2019091474A1

WO2019091474A1 - Method and apparatus for sending synchronization symbol

Info

Publication number: WO2019091474A1
Application number: PCT/CN2018/115006
Authority: WO
Inventors: 殷慧; 王威扬
Original assignee: 华为技术有限公司
Priority date: 2017-11-13
Filing date: 2018-11-12
Publication date: 2019-05-16
Also published as: CN109787735A

Abstract

Disclosed are a method and apparatus for sending a synchronization symbol. The method comprises: a network side device determining to receive an uplink synchronization symbol in one time slot resource, and being connected to a user node by means of a twisted pair, wherein the user node is connected to at least two CPEs, the at least two CPEs communicate with the network side device by means of TDD, and the time slot resource is a complete time slot allocated to one CPE of the at least two CPEs for use, a TDD frame in the complete time slot or a symbol in the TDD frame; sending a first indication message to one CPE of the at least two CPEs, wherein the first indication message indicates that the CPE occupies the time slot resource and sends the uplink synchronization symbol in the time slot resource; and receiving the uplink synchronization symbol in the time slot resource. The problem that uplink crosstalk, caused by calculating an uplink crosstalk cancellation coefficient based on uplink synchronization symbols sent by different CPEs, cannot be accurately eliminated can be solved.

Description

Method and device for transmitting synchronization symbols

Technical field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for transmitting synchronization symbols.

Background technique

In recent years, due to the communication between the Central Office (CO) and the Customer Premise Equipment (CPE), the twisted pair line can provide users with a transmission rate of approximately 1 Gbps, so The network architecture composed of twisted wires has received extensive attention from operators, and a point-to-multipoint (P2MP) network architecture is one of them. In the P2MP network architecture, one end of the line formed by the twisted pair is connected to one port of the central office equipment, and the other end is connected to multiple CPEs. Multiple CPEs share one line by time division multiplexing, so that CO can communicate with multiple CPEs. . The CO usually includes multiple ports, each of which can be connected to a line composed of twisted pairs. Each line can be connected to multiple CPEs. Usually, each CPE in a home shares a line. The time of each line is divided into multiple frames, and each CPE of the shared line transmits data to the CO through different frames. To maximize the utilization of the resources of the line, the CO dynamically allocates the occupied frames for each CPE.

In the P2MP network architecture, when multiple COs communicate with multiple home CPEs through multiple lines, signals transmitted by multiple lines interfere with each other. This type of interference is called crosstalk, including uplink crosstalk and downlink crosstalk, so CO passes through multiple lines. When the line communicates with multiple home CPEs, it is also necessary to consider the problem of eliminating crosstalk. The vectorized crosstalk cancellation technique is a technique that cancels crosstalk between multiple lines. In the vectorized crosstalk cancellation technique, the process of uplink crosstalk cancellation is: the CPE configuration pilot sequence of each line connected to the CO, the number of pilot sequences is related to the number of line connection CPEs, and all pilot sequences are orthogonal to each other. Each CPE sends an uplink synchronization symbol carrying a pilot sequence to the CO through the line; the vectorization control unit in the CO can calculate the uplink crosstalk cancellation coefficient based on the orthogonal relationship between the pilot sequences in the uplink synchronization symbol; the CO obtains the uplink crosstalk. After the cancellation coefficient, the signal transmitted in the line can be processed according to the uplink crosstalk cancellation coefficient to cancel the uplink crosstalk of the signal transmitted in the line.

Since the state of the line may change, the crosstalk between the lines may also change. Therefore, the CO also needs to correct the uplink crosstalk cancellation coefficient during communication with the CPE. In the process of communication between the CO and the CPE, the CPE also needs to The uplink synchronization symbol is transmitted to the CO so that the CO can correct the uplink crosstalk cancellation coefficient according to the received synchronization symbol.

During the communication between the CO and the CPE, the CPE sends an uplink synchronization symbol carrying an element in the pilot sequence to the CO through the frame of the specified location, and sends the next element in the carried pilot sequence to the CO at the next specified location. The uplink synchronization symbol is such that the uplink synchronization symbol is sequentially transmitted to the CO in the order of the elements in the pilot sequence. Since the CO dynamically allocates the frame occupied by the CPE for the CPE sharing one line, the CPE of the frame allocated to the specified location needs to send the synchronization symbol to the CO.

When the CO dynamically allocates the occupied frame for each CPE, the frame of the specified location may be allocated to any CPE sharing a line, so the CPE of the frame allocated to the specified location needs to send the uplink synchronization symbol. However, the parameters of different CPEs may be different. Therefore, the CO calculates the uplink crosstalk cancellation coefficient based on the uplink synchronization symbols sent by different CPEs, which may result in the CO not accurately calculating the uplink crosstalk cancellation coefficient, which may cause the uplink crosstalk to be accurately eliminated.

Summary of the invention

The present invention provides a method and a device for transmitting synchronization symbols, which can solve the problem that the CO cross-talk cancellation coefficient is calculated based on the uplink synchronization symbols sent by different CPEs, which may result in the CO not accurately calculating the uplink crosstalk cancellation coefficient, thereby causing the uplink crosstalk cannot be accurately eliminated. The problem.

In a first aspect, the present application provides a method for transmitting a synchronization symbol, including: determining, by a network side device, an uplink synchronization symbol in a time slot resource, where the network side device connects to a user node by using a twisted pair, the user The node is connected to at least two CPEs, and the at least two CPEs communicate with the network side device by using a TDD manner, where the time slot resource is a complete time slot allocated to one of the at least two CPEs, the complete a TDD frame in a time slot or a symbol in the TDD frame; the network side device sends a first indication message to one of the at least two CPEs, the first indication message indicating that the CPE occupies the The time slot resource sends an uplink synchronization symbol in the time slot resource; the network side device receives the uplink synchronization symbol on the time slot resource.

In this application, the network side device is connected to the user node through a twisted pair. After determining the time slot resource for sending the uplink synchronization symbol, the network side device may indicate that one CPE of the at least two CPEs connected to the user node passes the time slot resource. The uplink synchronization symbol is sent to ensure that only one CPE sends the uplink synchronization symbol, thereby ensuring the accuracy of the uplink crosstalk cancellation coefficient according to the uplink synchronization symbol, thereby improving the accuracy of the uplink crosstalk cancellation.

With reference to the first aspect, in a first implementation manner of the first aspect, the network side device, when the first indication message is sent to a CPE that occupies the time slot resource, includes:

The network side device sends the first indication message to other CPEs other than the CPE in the at least two CPEs.

In this implementation manner, the network side device sends the first indication message to the CPEs of the at least two CPEs except the CPE, so that the CPEs connected to the user nodes can receive the first indication message, and further Determining, by the network side device, a CPE that occupies the time slot resource and sends an uplink synchronization symbol in the time slot resource.

With reference to the first aspect, or any one of the foregoing implementation manners of the first aspect, in the second implementation manner of the first aspect, the time slot resource further includes another one or more symbols of the TDD frame, the another One or more symbols are used to transmit the error pattern;

The first indication message further indicates that the CPE sends an error pattern in the another one or more symbols, where the error pattern is calculated by the CPE according to the downlink synchronization symbol sent by the network side device.

With reference to the first aspect or any one of the foregoing implementation manners of the first aspect, in a third implementation manner of the first aspect, the method further includes:

The network side device changes the time slot resource;

The network side device sends a second indication message to the at least two CPEs, where the second indication message indicates the changed time slot resource.

With the first aspect or the foregoing implementation manner of the first aspect, in a fourth implementation manner of the first aspect, after the network side device receives the uplink synchronization symbol on the time slot resource, the network side device further includes:

The network side device changes a CPE that sends an uplink synchronization symbol in the time slot resource, and the changed CPE is one of the at least two CPEs;

The network side device sends a second indication message to the CPE before the change and the changed CPE, where the second indication message indicates that the CPE before the change does not send the uplink synchronization symbol in the time slot resource, and the changed CPE is The time slot resource transmits an uplink synchronization symbol.

In the case that the CPE is offline or the communication is faulty before the change, the network side device can change the CPE that sends the uplink synchronization symbol in the time slot resource to ensure that the uplink synchronization symbol can be received in time and accurately.

With the first aspect or the foregoing implementation manner of the first aspect, in a fifth implementation manner of the first aspect, the network side device sends the second indication message to the CPE before the change and the changed CPE ,Also includes:

The network side device sends the second indication message to the CPEs other than the changed CPE and the changed CPE among the at least two CPEs.

In a second aspect, the application provides a method for sending a synchronization symbol, including:

The CPE receives the first indication information sent by the network side device, where the first indication message indicates that the CPE occupies a slot resource and sends an uplink synchronization symbol in the slot resource, and the network side device passes a twisted pair a line connecting the user node, the user node connection comprising at least two CPEs of the CPE, the time slot resource being a complete time slot allocated for one of the at least two CPEs, in the complete time slot a TDD frame or a symbol in the TDD frame;

The CPE sends an uplink synchronization symbol in the time slot resource.

In this application, the customer premises equipment is one of the at least two CPEs connected to the user node, and the user node is connected to the network side device through a twisted pair. After receiving the first indication message, the customer premises equipment is instructed to send. The CPE of the uplink synchronization symbol sends an uplink synchronization symbol in the time slot resource, so that the network side device only receives the uplink synchronization symbol sent by the user premises equipment, thereby ensuring that the network side device calculates the uplink crosstalk cancellation coefficient according to the uplink synchronization symbol. Accuracy, which in turn improves the accuracy of uplink crosstalk cancellation.

With reference to the second aspect, in a first implementation manner of the second aspect, when the time slot resource is one symbol in the TDD frame, the time slot resource further includes another one or more of the TDD frame A symbol, the one or more symbols being used to transmit an error pattern.

With the second aspect or the foregoing implementation manner of the second aspect, in a second implementation manner of the second aspect, the method further includes:

Receiving, by the CPE, a second indication message of the network side device, where the second indication message indicates the changed time slot resource;

The CPE sends an uplink synchronization symbol in the changed slot resource.

With the second aspect or the foregoing implementation manner of the second aspect, in a third implementation manner of the second aspect, the method further includes:

Receiving, by the CPE, a third indication message of the network side device, where the third indication message is used to indicate that the CPE does not send an uplink synchronization symbol in the time slot resource;

The CPE stops transmitting data in the slot resource.

In a third aspect, the application provides a network side device, including:

a determining unit, configured to determine to receive an uplink synchronization symbol in a time slot resource, where the network side device connects to the user node by using a twisted pair, the user node connecting at least two customer premises equipment CPE, the at least two CPEs Communicating with the network side device by a time division multiplexing TDD method, where the time slot resource is a complete time slot allocated to one of the at least two CPEs, one TDD frame in the complete time slot, or the a symbol in a TDD frame;

a sending unit, configured to send a first indication message to one of the at least two CPEs, where the first indication message indicates that the CPE occupies the time slot resource and sends an uplink synchronization symbol in the time slot resource;

And a receiving unit, configured to receive an uplink synchronization symbol on the time slot resource.

With reference to the third aspect, in a first implementation manner of the third aspect, the sending unit is further configured to send the first indication message to a CPE other than the CPE in the at least two CPEs.

With reference to the third aspect, or any one of the foregoing implementation manners of the third aspect, in the second implementation manner of the third aspect, the time slot resource further includes another one or more symbols of the TDD frame, the another One or more symbols are used to transmit the error pattern;

With the third aspect or the foregoing implementation manner of the third aspect, in a third implementation manner of the third aspect, the device further includes:

a first changing unit, configured to change the time slot resource;

The sending unit is further configured to send, to the at least two CPEs, a second indication message, where the second indication message indicates the changed slot resource.

With the third aspect or the foregoing implementation manner of the third aspect, in a fourth implementation manner of the third aspect, the device further includes:

a second changing unit, configured to change a CPE that sends an uplink synchronization symbol in the time slot resource, where the changed CPE is one of the at least two CPEs;

The sending unit is configured to send a second indication message to the CPE before the change and the changed CPE, where the second indication message indicates that the CPE before the change does not send the uplink synchronization symbol in the slot resource, and the changed The CPE transmits an uplink synchronization symbol in the slot resource.

With the third aspect or the foregoing implementation manner of the third aspect, in a fifth implementation manner of the third aspect, the sending unit is further configured to: before the change, the CPE and the change to the at least two CPEs The other CPEs other than the latter CPE send the second indication message.

In a fourth aspect, the application provides a user premises equipment, including:

a receiving unit, configured to receive first indication information that is sent by the network side device, where the first indication message indicates that the user premises equipment CPE occupies a slot resource and sends an uplink synchronization symbol in the slot resource, where the network side device Connecting to the user node by a twisted pair, the user node connection comprising at least two CPEs of the CPE, the time slot resource is a complete time slot allocated for allocating one of the at least two CPEs, One TDD frame in a complete time slot or one symbol in the TDD frame;

And a sending unit, configured to send an uplink synchronization symbol in the time slot resource.

With reference to the fourth aspect, in a first implementation manner of the fourth aspect, when the time slot resource is one symbol in the TDD frame, the time slot resource further includes another one or more of the TDD frame A symbol, the one or more symbols being used to transmit an error pattern.

With reference to the fourth aspect, or any one of the foregoing implementation manners of the fourth aspect, in the second implementation manner of the fourth aspect, the receiving unit is further configured to receive a second indication message of the network side device, where the The second indication message indicates the changed slot resource;

The sending unit is further configured to send an uplink synchronization symbol in the changed slot resource.

With reference to the fourth aspect, or any one of the foregoing implementation manners of the fourth aspect, in a third implementation manner of the fourth aspect, the receiving unit is further configured to receive a third indication message of the network side device, where the The three indication message is used to indicate that the CPE does not send an uplink synchronization symbol in the time slot resource;

The customer premises equipment further includes:

And a stopping unit, configured to stop transmitting data in the time slot resource.

In a fifth aspect, an embodiment of the present invention provides a network side device, including: one or more processors, a memory, and a communication interface;

The memory, the communication interface coupled to the one or more processors;

The memory is for storing computer program code, the computer program code comprising instructions, when the one or more processors execute the instruction, the network side device is configured to perform the first aspect or the first aspect A method of transmitting a synchronization symbol as described in any of the implementations.

In a sixth aspect, an embodiment of the present invention provides a user premises equipment, including: one or more processors, a memory, and a communication interface;

The memory, the communication interface coupled to the one or more processors;

The memory is for storing computer program code, the computer program code comprising instructions for performing the second aspect or the second aspect when the one or more processors execute the instruction A method of transmitting a synchronization symbol as described in any of the implementations.

According to a seventh aspect, an embodiment of the present invention provides a synchronization symbol transmission system, including the network side device according to the fifth aspect, and the user premises equipment according to the sixth aspect.

In an eighth aspect, an embodiment of the present invention provides a computer readable storage medium, where the computer readable storage medium stores instructions that, when run on a computer, cause the computer to perform any of the first aspect or the first aspect. The method described in the manner.

According to a ninth aspect, an embodiment of the present invention provides a computer readable storage medium, where the computer readable storage medium stores instructions, when executed on a computer, causing the computer to perform any of the second aspect or the second aspect. The method described in the manner.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings to be used in the embodiments of the present invention will be briefly described below.

1 is a schematic diagram of a network architecture according to an embodiment of the present invention;

2 is a schematic diagram of a TDD frame according to an embodiment of the invention;

FIG. 3 is a schematic flowchart of a method for sending a synchronization symbol according to an embodiment of the invention;

4a and 4b are schematic diagrams showing a first type of TDD frame allocation according to an embodiment of the invention;

5a and 5b are schematic diagrams showing a second type of TDD frame allocation according to an embodiment of the invention;

6a and FIG. 6b are schematic diagrams showing a third type of TDD frame allocation according to an embodiment of the invention;

7a and 7b are schematic diagrams showing a fourth type of TDD frame allocation according to an embodiment of the invention;

8a and 8b are schematic diagrams showing a fifth type of TDD frame allocation according to an embodiment of the invention;

9a and 9B are schematic diagrams showing a sixth type of TDD frame allocation according to an embodiment of the invention;

10a and FIG. 10b are schematic diagrams showing a seventh type of TDD frame allocation according to an embodiment of the invention;

11a and FIG. 11b are schematic diagrams showing an eighth type of TDD frame allocation according to an embodiment of the invention;

FIG. 12 is a schematic block diagram of a network side device according to an embodiment of the invention;

FIG. 13 is a schematic block diagram of a network side device according to another embodiment of the present invention; FIG.

FIG. 14 is a schematic block diagram of a user premises equipment according to an embodiment of the invention;

FIG. 15 is a schematic block diagram of a user premises equipment according to another embodiment of the present invention; FIG.

FIG. 16 is a schematic block diagram of a network side device according to another embodiment of the present invention; FIG.

FIG. 17 is a schematic block diagram of a customer premises equipment according to another embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. The embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

The embodiment of the present invention may be used in a scenario where a CPE sends a synchronization symbol to a network side device, and the network side device may be a local office device. FIG. 1 is a schematic diagram of a network architecture applicable to an embodiment of the present invention. As shown in Figure 1, the network side device is described as an example of a central office device. The central office device includes multiple ports, and each port can be connected to a twisted pair cable to form a line. Each line is connected to one user node, and each user node is connected to at least two CPEs. Generally, at least two CPEs connected by one user node belong to the CPE of the same family. In Figure 1, the central office equipment connects two twisted pairs (line A and line B) through two ports. Line A is connected to user node A. User node A is connected to CPE belonging to family A. CPE belonging to family A Including A1, A2, A3, and A4, line B is connected to user node B, user node B is connected to CPE belonging to home B, and CPE belonging to family B includes B1, B2, B3, and B4. The CPE connected to each user node communicates with the central office device by means of time division multiplexing. Generally, the time of the communication line between the central office device and the CPE is divided into multiple TDD frames, and the preset number is determined. The TDD frame is divided into a superframe. As shown in FIG. 2, in the embodiment of the present invention, the preset number is 7 as an example, and every 7 TDD frames are used as a superframe, and the frame index is a TDD frame included in each superframe. Serial number. The central office device can allocate TDD frames for each CPE in units of time slots (represented by Ts), and the number of TDD frames included in each time slot can be preset. For example, the time of line A can be divided in the manner shown in FIG. For a plurality of TDD frames, and each time slot is set to include one TDD frame, the central office device allocates TDD frames to A1, A2, A3, and A4 in units of time slots (one TDD frame). When the central office device communicates with the CPE connected to each user node, the TDD frame used by the CPE in each user node to send the uplink synchronization symbol may be set, which is called a target frame (the target frame is represented by Sf). The target frame is usually the first TDD frame in each superframe, that is, the TDD frame with the frame index of 1 in each TDD frame shown in FIG. Each TDD frame may also be divided into multiple symbols, and the CPE sends an uplink synchronization symbol to the central office device by using one symbol in the target frame, and the symbol used by the target frame for transmitting the uplink synchronization symbol may be referred to as a target symbol.

In the embodiment of the present invention, the CPE connected to the user node A in the network architecture of FIG. 1 sends a synchronization symbol to the central office device as an example for description. The central office equipment connects four CPEs through the user node A, and configures one pilot sequence. When the CPE sends the uplink synchronization symbols through the target symbols in the target frame, the CPE needs to follow the order of the elements in the pilot sequence. The elements in the frequency sequence are carried to the synchronization symbol and sent to the central office device. In order to prevent the CO from calculating the uplink crosstalk cancellation coefficient based on the uplink synchronization symbols sent by the different CPEs, the CO may not accurately calculate the uplink crosstalk cancellation coefficient. In the embodiment of the present invention, the central office device indicates at least two connections with the user node A. A CPE in the CPE sends the uplink synchronization symbol, and the other CPEs in the at least two CPEs do not send the uplink synchronization symbol. In this case, the CPE that sends the uplink synchronization symbol indicated by the central office device is called the target device, and the other CPEs are non-target devices. That is, only the target device can transmit the uplink synchronization symbol among at least two CPEs connected to the user node. In this way, the central office device only receives the uplink synchronization symbol sent by the target device, so that an accurate uplink crosstalk cancellation coefficient can be calculated, thereby accurately eliminating the uplink crosstalk.

In the prior art, the central office equipment dynamically allocates TDD frames for the CPEs connected to the same user node, and the CPEs allocated to the target frames need to send uplink synchronization symbols to the COs in the order of the elements in the pilot sequence, so The CPE of the target frame needs to determine which element needs to be carried in the uplink synchronization symbol sent this time to send an accurate uplink synchronization symbol. However, the CPE allocated to the target frame cannot determine which element of the pilot sequence needs to be carried by the uplink synchronization symbol transmitted this time, which may result in the inability to transmit an accurate uplink synchronization symbol. In the embodiment of the present invention, the central office device indicates the target device, and the target device may record the elements of the carried pilot sequence when transmitting the uplink synchronization symbol, and then may send an accurate uplink synchronization symbol.

An embodiment of the present invention provides a method for transmitting a synchronization symbol, which is used in the network architecture shown in FIG. 1. As shown in FIG. 3, the method includes the following steps.

101. The network side device determines to receive an uplink synchronization symbol in one slot resource.

The network side device connects to the user node through a twisted pair, the user node connects to at least two CPEs, and at least two CPEs communicate with the network side device through the TDD mode.

The network side device may determine one slot resource that receives the uplink synchronization symbol, and then the CPE sends the uplink synchronization symbol by using the slot resource determined by the central office device. The at least two CPEs communicate with the network side device through the TDD mode, and the network side device dynamically allocates the TDD frame to the at least two CPEs in units of time slots, so the time slot resource can be allocated to one CPE of the at least two CPEs. One complete time slot, one TDD frame in a full time slot, or one symbol in a TDD frame.

The CPE can transmit the uplink synchronization symbol by one symbol, and the symbol used to transmit the uplink synchronization symbol is the target symbol. The network side device may determine one symbol in one TDD frame as a slot resource, determine a TDD frame as a slot resource, or determine a complete slot as a slot resource. When the network side device determines a TDD frame as a slot resource, or determines a complete slot as a slot resource, the CPE sends an uplink synchronization symbol by using a target symbol for transmitting an uplink synchronization symbol in the slot resource. The other symbols in the slot resource and the network side device transfer data.

102. The network side device sends a first indication message to one of the at least two CPEs.

The first indication message indicates that the CPE occupies the slot resource and sends the uplink synchronization symbol in the slot resource. The network side device sends a first indication message to one of the at least two CPEs to indicate that the CPE occupies the slot resource and sends the uplink synchronization symbol in the slot resource, that is, the CPE is indicated as the target device.

It should be noted that, in this step, the network side device may send the first indication information only to the CPE that is instructed to send the uplink synchronization symbol in the slot resource. At this time, the CPE in the at least two CPEs may be used according to whether the CPE is received. The first indication message determines whether it is instructed to transmit an uplink synchronization symbol in the slot resource. If the first indication message is received, the CPE indicating that the uplink synchronization symbol is sent in the slot resource is indicated; if the first indication message is not received, the indication is not indicated as sending the uplink synchronization in the slot resource. Symbolic CPE. Alternatively, in this step, the network side device may also send the first indication information by means of a broadcast, where the first indication message includes an identifier of the CPE that is indicated to send the uplink synchronization symbol in the slot resource, and each CPE connected to the user node. After receiving the first indication message, it may be determined based on the content of the first indication message which CPE is instructed to send an uplink synchronization symbol in the slot resource, ie, which CPE is indicated as the target device. In the embodiment of the present invention, the network side device only sends the first indication information to the CPE that is instructed to send the uplink synchronization symbol in the slot resource as an example.

103. After receiving the first indication information sent by the network side device, the CPE sends an uplink synchronization symbol in the time slot resource, so that the network side device receives the uplink synchronization symbol on the time slot resource.

The first indication message indicates that the CPE occupies the slot resource and sends the uplink synchronization symbol in the slot resource. The CPE receives the first indication information sent by the network side device, indicating that it is indicated by the network side device as the target device, and needs to send the uplink synchronization symbol by using the time slot resource. In this step, the CPE is indicated as the target device, and the other CPEs connected to the user node are non-target devices. After the CPE is indicated as the target device, the uplink synchronization symbol needs to be sent in the slot resource.

Since each CPE can confirm which TDD frame is the target frame by using a counter or the like, the CPE can determine which resources are time slot resources, and the target device needs to send the uplink synchronization symbol in the time slot resource after determining the time slot resource. Generally, the first TDD frame in each superframe is a target frame for transmitting an uplink synchronization symbol, and the symbol for transmitting the uplink synchronization symbol in the target frame is a target symbol, and the position of the target symbol in the target frame is preset. . When the CPE sends the uplink synchronization symbol in the time slot resource, if the time slot resource is the target symbol, the CPE sends the uplink synchronization symbol in the target symbol; if the time slot resource is a TDD frame, that is, the target frame, the CPE sends the uplink synchronization in the target symbol. a symbol that transmits data between other symbols of the target frame and the network side device; if the time slot resource is a complete time slot, the CPE transmits an uplink synchronization symbol in the target symbol, between other symbols of the complete time slot and the network side device transfer data.

It should be noted that, for the non-target device in the CPE connected to the user node, after receiving the time slot allocated by the network side device for use, it is determined whether the time slot allocated to the used time slot includes the time slot resource. Since the target device needs to occupy the time slot resource, if the time slot allocated to the non-target device includes the time slot resource, the non-target device needs to let the time slot resource be used by the target device, that is, stop transmitting data through the time slot resource.

Specifically, when the time slot resource is the target frame, if the time slot allocated to the non-target device includes the time slot resource, the non-target device gives up the time slot resource to the target device. As shown in FIG. 4a, an example in which the CPE in the A home sends an uplink synchronization symbol to the central office device in the architecture shown in FIG. Each superframe is set to include 7 TDD frames, and the target frame is the first TDD frame of each superframe (shown by a broken line in the figure), that is, a slot resource, and each slot includes 3 TDD frames, and the target The devices are A1, A2, A3 and A4 are non-target devices. The central office equipment allocates each time slot to the CPE in the A home, wherein the time slot in which the first time slot resource is located and the time slot in which the third time slot resource is located are allocated to A1, and A1 can pass the time slot. The resource directly transmits the uplink synchronization symbol; the time slot in which the second time slot resource is located is allocated to A3, and A3 is a non-target device, so A3 can give the time slot resource to A1, and A3 gives up the time slot resource, and each frame The distribution can be as shown in Figure 4b.

Specifically, when the time slot resource is the entire time slot in which the target frame is located, if the time slot allocated to the non-target device includes the time slot resource, the non-target device gives up the time slot resource to the target device, that is, the entire time slot is allowed. Used by the target device. As shown in FIG. 5a, an example in which the CPE in the A home sends an uplink synchronization symbol to the central office device in the architecture shown in FIG. Set each superframe to include 7 TDD frames, the target frame is the first TDD frame of each superframe, each time slot includes 3 TDD frames, and the entire time slot in which the target frame is located is a time slot resource, and the target device is A1, A2, A3, and A4 are non-target devices. The central office equipment allocates each time slot to the user premises equipment in the A home, wherein the first time slot resource and the third time slot resource are all allocated to A1, and then A1 can directly send the uplink synchronization symbol by using the time slot resource. The second time slot resource is allocated to A3, A3 is not the target device, so A3 can give the entire time slot to A1. After A3 gives up the time slot resource, the allocation of each frame can be as shown in Figure 5b.

When the target device sends the uplink synchronization symbol, it needs to be sent based on the elements in the order of the elements in the pilot sequence. Each uplink synchronization symbol sent carries one element. To ensure the accuracy of the transmission, the target device can record after each transmission. This time, the position where the uplink synchronization symbol carries the element is transmitted. The pilot sequence is preset for each CPE, and the network side device can broadcast the pilot sequence to each CPE in a CPE initialization phase or a CPE handshake phase.

It should be noted that, since the network side device can send the downlink synchronization symbol to all CPEs connected to the user node through the target frame, the CPE that normally uses the target frame needs to calculate the error pattern according to the downlink synchronization symbol after receiving the downlink synchronization symbol (error) Sample), and sends the calculated error sample to the network side device by using the symbol for sending the error sample in the target frame, so that the network side device calculates the downlink crosstalk cancellation coefficient.

In the embodiment of the present invention, the network side device indicates that the uplink synchronization symbol is sent by the target device, but the error sample received by the network side device may be sent by the non-target device. When the uplink synchronization symbol is sent by the target device and the error sample is sent by the non-target device, the network side device receives the error sent by the non-target device because the parameters of the data transmission line between the target device and the non-target device are different. After the sample, some processing needs to be done to ensure that the calculation of the crosstalk cancellation coefficient is not affected. For example, the central office device can compensate the received error sample with a coefficient of line attenuation, that is, the ratio of line attenuation between the target device and the non-target device, and the like. .

To simplify the calculation process of the network side device and improve the accuracy of the crosstalk cancellation coefficient calculation, in an example of the embodiment of the present invention, the network side device indicates that both the uplink synchronization symbol and the error pattern are sent by the same CPE. Specifically, the network side device may further indicate, in the first indication message sent in step 102, that the CPE occupies the slot resource and sends the uplink synchronization symbol and the error pattern in the slot resource, that is, the target device needs to send the uplink synchronization symbol in the slot resource. Wrong pattern.

At this time, the slot resource may further include another symbol or symbols of the TDD frame, and another symbol or symbols of the TDD frame are used to transmit the error pattern. That is, the slot resource includes not only the symbol for transmitting the uplink synchronization symbol but also the symbol for transmitting the error pattern.

The symbols for transmitting the uplink synchronization symbol and the error pattern usually belong to the same TDD frame, that is, the target frame. Therefore, when the time slot resource is a TDD frame or a complete time slot, the symbol for transmitting the error pattern is already included, and the time slot resource is TDD. When one symbol of a frame is used, it is also necessary to include another symbol or symbols in the TDD frame to cause the target device to send an error pattern.

It should be noted that when the time slot resource is one symbol of the TDD frame, the network side device may further indicate that the target device sends the error pattern by using the TDD frame allocated to the target device. If the time slot resource is allocated to the non-target device by the network side device, the target device needs to wait until the network side device allocates the TDD frame to the TDD frame, and then sends the calculation through the TDD frame allocated by the network side device. The wrong pattern. In this case, in order to ensure that the error pattern transmission can be sent to the network side device in time, the network side device needs to ensure that the TDD frame allocated to the target device is used in each superframe, that is, before the next downlink synchronization symbol is sent, the network The side device needs to allocate the TDD frame used by the target device to ensure that the network side device can receive the calculated error pattern sent by the target device.

In the embodiment of the present invention, the network side device is connected to the user node by using a twisted pair line. After determining the time slot resource for sending the uplink synchronization symbol, the network side device may indicate at least two CPEs connected to the user node by using the first indication message. A CPE sends an uplink synchronization symbol by using a time slot resource; the CPE that is instructed to send the uplink synchronization symbol receives the first indication message sent by the network side device, and then sends an uplink synchronization symbol in the time slot resource, thereby ensuring that only one CPE sends the uplink synchronization symbol. The symbol ensures that the accuracy of the uplink crosstalk cancellation coefficient is calculated according to the uplink synchronization symbol, thereby improving the accuracy of the uplink crosstalk cancellation.

As an optional implementation manner of the embodiment of the present invention, the network side device may further change the time slot resource. After the step 103, the network side device may further send the second indication message to the at least two CPEs. The second indication message indicates the changed time slot resource: Step 105: After the CPE receives the second indication message of the network side device, the CPE sends the uplink synchronization symbol in the changed time slot resource.

The network side device may also change the location of the target frame during the communication with the CPE, and the location of the target frame may change the location of the slot resource. Therefore, the network side device needs to send the second indication to all the CPEs in the at least two CPEs. The information is used to notify the time slot resource after each CPE change, for example, to notify the location of the time slot resource after the change. After receiving the second indication information of the central office equipment, each CPE may re-confirm the location of the time slot resource according to the second indication information, so as to be able to accurately determine the resource used for transmitting data. The target device sends the uplink synchronization symbol in the changed slot resource according to the second indication information.

For example, as shown in FIG. 6a, when the time slot resource is the target frame, the CPE in the A home sends the uplink synchronization symbol to the central office device in the architecture shown in FIG. Each superframe is set to include 7 TDD frames, the target frame is the first TDD frame of each superframe, each slot includes 3 TDD frames, and the target device is A1, and A2, A3, and A4 are non-target devices. After receiving the uplink synchronization symbol by using the first slot resource, the central office device sends an indication message for changing the location of the slot resource to each CPE, that is, a second indication message, and changes the location of the slot resource to each superframe. The second TDD frame, as shown in Figure 6a, is a time slot resource. In FIG. 6a, the time slot to which the second time slot resource belongs is assigned to the non-target device A3, and the time slot to which the third time slot resource belongs is assigned to the non-target device A2. Therefore, A3 and A2 can give the slot resource to A1 after re-confirming the location of the target frame according to the second indication message. After A2 and A3 give up the slot resources, the allocation of each frame can be as shown in Figure 6b.

For example, as shown in FIG. 7a, when the time slot resource is the entire time slot, the CPE in the A home sends the uplink synchronization symbol to the central office device in the architecture shown in FIG. 1 as an example. Set each superframe to include 7 TDD frames, the target frame is the first TDD frame of each superframe, each time slot includes 3 TDD frames, and the entire time slot in which the target frame is located is a time slot resource, and the target device is A1, A2, A3, and A4 are non-target devices. After receiving the uplink synchronization symbol by using the first slot resource, the central office device sends an indication message for changing the location of the slot resource to each CPE, that is, a second indication message, and changes the location of the slot resource to each superframe. The time slot in which the second TDD frame is located, as shown in Figure 7a, is the time slot resource. In Figure 7a, the second time slot resource is allocated to the non-target device A3, and the third time slot resource is allocated to the non-target device A2. Therefore, A3 and A2 can give the slot resource to A1 after re-confirming the slot resource according to the second indication message. After A2 and A3 give up the time slot resources, the allocation of each frame can be as shown in Figure 7b.

As an optional implementation manner of the embodiment of the present invention, the network side device may also change the CPE that sends the uplink synchronization symbol in the time slot resource, that is, change the target device, for example, when the target device goes offline or the communication fails, the network side The device makes changes to the target device. After the step 103, the network side device may change the CPE that sends the uplink synchronization symbol in the slot resource, the changed CPE is one of the at least two CPEs, and the network side device changes the CPE before the change and the changed CPE. Sending a third indication message, the third indication message indicates that the CPE before the change does not send the uplink synchronization symbol in the slot resource, and the changed CPE sends the uplink synchronization symbol in the slot resource; after the CPE receives the third indication message of the network side device, The CPE stops transmitting data in the slot resource.

The network side device changes the target device, and sends a third indication message to the target device before the change and the target device after the change. After receiving the third indication message, the target device before the change can determine that it is changed to a non-target device, and then needs to stop sending the synchronization symbol in the slot resource. After receiving the third indication message, the changed target device may determine that it is changed to the target device, and then needs to occupy the slot resource and send the synchronization symbol in the slot resource, that is, perform the content performed by the target device as described in step 103.

Specifically, the third indication message may include an identifier of the target device after the change to notify which CPE is the target device after the change. The third indication message may further include a location of the element in the pilot sequence that was previously received in the uplink synchronization symbol.

When the changed target device receives the third indication information, if the third indication information only indicates that it is the target device, the changed target device may send the uplink synchronization symbol to the network side device by default based on the first element in the pilot sequence. The target device after the change is sent to the network side device by the uplink synchronization symbol in the order of the elements in the pilot sequence. When the changed target device receives the third indication information, if the third indication information further includes the location of the element in the pilot sequence that is received in the uplink synchronization symbol, the changed target device needs to be indicated according to the third indication message. The element position determines a specific element, and then, according to the order of each element in the pilot sequence, is sent to the network side device through the uplink synchronization symbol in sequence from the next element of the determined specific element.

It should be noted that, in the embodiment of the present invention, when indicating the target device, the network side device may send an indication message to each user premises equipment in a broadcast manner, or may only send an indication message to the target device. When the target device changes the target device, the third indication message may be sent to each user premises equipment by means of broadcast, or the third indication message may be sent only to the target device before the change and the target device after the change.

Specifically, when the time slot resource is the target frame, as shown in FIG. 8a, the CPE in the A home sends the uplink synchronization symbol to the central office device in the architecture shown in FIG. Each superframe is set to include 7 TDD frames, the target frame is the first TDD frame of each superframe, each slot includes 3 TDD frames, and the target device is A1, and A2, A3, and A4 are non-target devices. After receiving the uplink synchronization symbol by A1, the central office equipment can send a third indication message to A1, A2, A3, and A4 in a broadcast manner through the second time slot, and can also only send to A1 and A2 sends a third indication message. A2 determines that it is changed to the target device by using the third indication message, and then needs to send the uplink synchronization symbol by using the target symbol in the target frame. At the same time, A1 determines that it is changed to a non-target device by the third indication message. As shown in FIG. 8a, the time slot to which the second time slot resource belongs is allocated to the non-target device A3, and the time slot to which the third time slot resource belongs is allocated to the non-target device A1. However, A2 needs to occupy the time slot resource to send. Uplink synchronization symbol, so A1 and A3 give time slot resources to A2 for use. After A1 and A3 give up the slot resources, the allocation of each frame can be as shown in Figure 8b.

Specifically, when the time slot resource is the time slot to which the target frame belongs, as shown in FIG. 9a, the CPE in the A home sends the uplink synchronization symbol to the central office device in the architecture shown in FIG. 1 as an example. Each superframe is set to include 7 TDD frames, the target frame is the first TDD frame of each superframe, each slot includes 3 TDD frames, and the target device is A1, and A2, A3, and A4 are non-target devices. After receiving the uplink synchronization symbol by A1, the central office equipment can send a third indication message to A1, A2, A3, and A4 in a broadcast manner through the second time slot, and can also only send to A1 and A2 sends a third indication message. A2 determines that it is changed to the target device by using the third indication message, and then needs to send the uplink synchronization symbol by using the target symbol in the slot resource. At the same time, A1 determines that it is changed to a non-target device by the third indication message. As shown in FIG. 9a, the second slot resource is allocated to the non-target device A3, and the third slot resource is allocated to the non-target device A1. However, A2 needs to occupy the slot resource to send the uplink synchronization symbol, so A1 and A3 Give time slot resources to A2 for use. After A1 and A3 give up the slot resources, the allocation of each frame can be as shown in Figure 9b.

It should be noted that, in combination with the foregoing implementation manners in the embodiments of the present invention, the network side device may change the time slot resource and change the target device in the process of communicating with each user premises equipment. The target device after the change needs to re-confirm the slot resource and send the uplink synchronization symbol to the network side device.

Specifically, when the time slot resource is the target frame, as shown in FIG. 10a, the CPE in the A home sends the uplink synchronization symbol to the central office device in the architecture shown in FIG. Each superframe is set to include 7 TDD frames, the target frame is the first TDD frame of each superframe, each slot includes 3 TDD frames, and the target device is A1, and A2, A3, and A4 are non-target devices. After receiving the uplink synchronization symbol by A1, the central office equipment can send a second indication message to A1, A2, A3, and A4 in a broadcast manner through the second time slot, and can also pass the second The time slots send a third indication message to A1, A2, A3, and A4 in a broadcast manner, or only send a third indication message to A1 and A2 to indicate that A2 is changed to the target device, and the slot resource is changed to each superframe. The second TDD frame, at the same time, A1 determines that it is changed to a non-target device by the third indication message. As shown in Figure 10a, the dashed box is a slot resource. A2 determines that it is changed to the target device by using the third indication message, and then needs to send the uplink synchronization symbol by using the target symbol in the slot resource. As shown in FIG. 10a, the time slot to which the second time slot resource belongs is assigned to the non-target device A3, and the time slot to which the third time slot resource belongs is assigned to the target device A2. At this time, the time slot to which the second time slot resource belongs is allocated to the non-target device A3, but A2 needs to occupy the time slot resource to send the uplink synchronization symbol, so A3 gives the time slot resource to A2 for use. After A3 gives up the slot resources, the allocation of each frame can be as shown in Figure 10b.

For example, when the time slot resource is the time slot to which the target frame belongs, as shown in FIG. 11a, the CPE in the A home sends the uplink synchronization symbol to the central office device in the architecture shown in FIG. Each superframe is set to include 7 TDD frames, the target frame is the first TDD frame of each superframe, each slot includes 3 TDD frames, and the target device is A1, and A2, A3, and A4 are non-target devices. After receiving the uplink synchronization symbol by A1, the central office equipment can send a second indication message to A1, A2, A3, and A4 in a broadcast manner through the second time slot, and can pass the second The time slot broadcasts a third indication message to A1, A2, A3, and A4, or only sends a third indication message to A1 and A2 to indicate that A2 is changed to the target device, and the slot resource is changed to each superframe. The time slot of the second TDD frame is located, and at the same time, A1 determines that it is changed to a non-target device by using the third indication message. As shown in Figure 11a, the dashed box is a time slot resource. As shown in FIG. 11a, the second slot resource is allocated to the non-target device A3, and the third slot resource is allocated to the target device A2. At this time, although the second slot resource is allocated to the non-target device A3, A2 needs to occupy the slot resource to transmit the uplink synchronization symbol, so A3 gives the slot resource to A2 for use. After A3 gives up the slot resources, the allocation of each frame can be as shown in Figure 11b.

FIG. 12 is a schematic block diagram of a network side device 300 according to an embodiment of the invention. As shown in FIG. 12, the apparatus 300 includes:

The determining unit 301 is configured to determine to receive an uplink synchronization symbol in a time slot resource, where the network side device connects to the user node by using a twisted pair, the user node is connected to at least two customer premises equipment CPE, the at least two The CPE communicates with the network side device by using a time division multiplexing TDD mode, where the time slot resource is a complete time slot allocated to one CPE of the at least two CPEs, and one TDD frame or the complete time slot. a symbol in a TDD frame;

The sending unit 302 is configured to send a first indication message to one of the at least two CPEs, where the first indication message indicates that the CPE occupies the time slot resource and sends an uplink synchronization symbol in the time slot resource;

The receiving unit 303 is configured to receive an uplink synchronization symbol on the time slot resource.

In the embodiment of the present invention, the network side device 300 is connected to the user node by using a twisted pair. After determining the time slot resource for sending the uplink synchronization symbol, the network side device 300 may indicate that one of the at least two CPEs connected to the user node passes. The time slot resource sends the uplink synchronization symbol, so that only one CPE is sent to send the uplink synchronization symbol, thereby ensuring the accuracy of the uplink crosstalk cancellation coefficient according to the uplink synchronization symbol, thereby improving the accuracy of the uplink crosstalk cancellation.

It is to be understood that the sending unit 302 is further configured to send the first indication message to other CPEs other than the CPE in the at least two CPEs.

It can be understood that the time slot resource further includes another symbol or symbols of the TDD frame, and the other symbol or symbols are used to transmit an error pattern;

FIG. 13 is a schematic block diagram of a network side device 300 according to another embodiment of the present invention.

It can be understood that, as shown in FIG. 13, the network side device 300 further includes:

a first changing unit 304, configured to change the time slot resource;

The sending unit 302 is further configured to send, to the at least two CPEs, a second indication message, where the second indication message indicates the changed slot resource.

The second changing unit 305 is configured to change the CPE that sends the uplink synchronization symbol in the time slot resource, and the changed CPE is one of the at least two CPEs;

The sending unit 303 is configured to send a second indication message to the CPE before the change and the changed CPE, where the second indication message indicates that the CPE before the change does not send the uplink synchronization symbol in the slot resource, and after the change The CPE transmits an uplink synchronization symbol in the slot resource.

It is to be understood that the sending unit 302 is further configured to send the second indication message to the CPEs other than the changed CPE and the changed CPE in the at least two CPEs.

The network side device 300 according to an embodiment of the present invention may correspond to an execution body in a method of transmitting a synchronization symbol according to an embodiment of the present invention, and the above-described and other operations and/or functions of respective modules in the network side device 300 are respectively The corresponding processes performed by the network side device in the embodiment shown in FIG. 3 are implemented. For brevity, details are not described herein again.

FIG. 14 is a schematic block diagram of a customer premises equipment 400 according to an embodiment of the invention. As shown in FIG. 14, the customer premises equipment 400 includes:

The receiving unit 401 is configured to receive first indication information that is sent by the network side device, where the first indication message indicates that the user premises equipment CPE occupies a slot resource and sends an uplink synchronization symbol in the slot resource, where the network side The device is connected to the user node by using a twisted pair, the user node connection includes at least two CPEs of the CPE, and the time slot resource is a complete time slot allocated for allocating one CPE of the at least two CPEs. Describe a TDD frame in a complete time slot or a symbol in the TDD frame;

The sending unit 402 is configured to send an uplink synchronization symbol in the time slot resource.

In the embodiment of the present invention, the customer premises equipment 400 is one of the at least two CPEs connected to the user node, and the user node is connected to the network side device through a twisted pair. After receiving the first indication message, the customer premises equipment 400 receives the first indication message. The CPE is instructed to send the uplink synchronization symbol, and the uplink synchronization symbol is sent in the time slot resource, so that the network side device only receives the uplink synchronization symbol sent by the user premises equipment 400, thereby ensuring that the network side device is based on the uplink synchronization symbol. The accuracy of the uplink crosstalk cancellation coefficient is calculated, thereby improving the accuracy of the uplink crosstalk cancellation.

It can be understood that when the time slot resource is one symbol in the TDD frame, the time slot resource further includes another symbol or symbols of the TDD frame, and the other symbol or symbols are used for Transfer the error pattern.

It is to be understood that the receiving unit 401 is further configured to receive a second indication message of the network side device, where the second indication message indicates a changed time slot resource;

The sending unit 402 is further configured to send an uplink synchronization symbol in the changed slot resource.

FIG. 15 is a schematic block diagram of a customer premises equipment 400 according to another embodiment of the present invention.

It is to be understood that the receiving unit 401 is further configured to receive a third indication message of the network side device, where the third indication message is used to indicate that the CPE does not send an uplink synchronization symbol in the time slot resource;

The customer premises equipment 400 may further include:

The stopping unit 403 is configured to stop transmitting data in the time slot resource.

The customer premises equipment 400 according to an embodiment of the present invention may correspond to an execution subject in a method of transmitting synchronization symbols according to an embodiment of the present invention, and the above-described and other operations and/or functions of the respective modules in the customer premises equipment 400 are respectively The corresponding processes performed by the user premises equipment in the embodiment shown in FIG. 3 are implemented. For brevity, details are not described herein again.

FIG. 16 is a schematic block diagram of a network side device 500 according to another embodiment of the present invention. As shown in FIG. 16, the network side device 500 includes a processor 501 for storing executable program code, and a communication interface 503 for operating by reading executable program code stored in the memory 502. a program corresponding to the executable program code, the communication interface 503 is used to communicate with an external device, and the network side device 500 may further include a bus 504 for connecting the processor 501, the memory 502, and the communication interface 503, so that the processor 501, The memory 502 and the communication interface 503 communicate with each other via the bus 504.

The network side device 500 according to the embodiment of the present invention may correspond to an execution body in a method for transmitting a synchronization symbol according to an embodiment of the present invention, and each operation and/or function in the network side device 500 is respectively implemented to implement FIG. The corresponding processes of the network side device in the embodiment are not described herein for brevity.

FIG. 17 is a schematic block diagram of a customer premises equipment 600 in accordance with another embodiment of the present invention. As shown in FIG. 17, the customer premises equipment 600 includes a processor 601 for storing executable program code, and a communication interface 603 for operating by reading executable program code stored in the memory 602. a program corresponding to the executable program code, the communication interface 603 is configured to communicate with an external device, and the customer premises equipment 600 can further include a bus 604 for connecting the processor 601, the memory 602, and the communication interface 603 to enable the processor 601, The memory 602 and the communication interface 603 communicate with each other via the bus 604.

The user premises equipment 600 according to an embodiment of the present invention may correspond to an execution subject in a method of transmitting a synchronization symbol according to an embodiment of the present invention, and each operation and/or function in the user premises equipment 600 is respectively implemented as shown in FIG. The corresponding processes of the user premises equipment in the embodiment are not described herein for brevity.

An embodiment of the present invention provides a synchronization symbol transmission system, including the network side device 500 shown in FIG. 16 and the user premises equipment 600 shown in FIG.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present invention are generated in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transfer to another website site, computer, server, or data center by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL), or wireless (eg, infrared, wireless, microwave, etc.). The computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media. The usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (such as a Solid State Disk (SSD)) or the like.

Claims

A method for transmitting a synchronization symbol, comprising:

The network side device determines to receive the uplink synchronization symbol in one time slot resource, and the network side device connects the user node through a twisted pair, the user node connects at least two customer premises equipment CPE, and the at least two CPEs pass the time division. The multiplexed TDD mode communicates with the network side device, where the time slot resource is one complete time slot allocated to one CPE of the at least two CPEs, one TDD frame in the complete time slot, or the TDD frame a symbol in ;

The network side device sends a first indication message to one of the at least two CPEs, where the first indication message indicates that the CPE occupies the time slot resource and sends an uplink synchronization symbol in the time slot resource;

The network side device receives an uplink synchronization symbol on the time slot resource.
The method according to claim 1, wherein the network side device sends the first indication message to a CPE that occupies the time slot resource, and further includes:

The network side device sends the first indication message to other CPEs other than the CPE in the at least two CPEs.
The method according to claim 1 or 2, wherein the time slot resource further comprises another symbol or symbols of the TDD frame, and the other symbol or symbols are used for transmitting an error pattern;

The first indication message further indicates that the CPE sends an error pattern in the another one or more symbols, where the error pattern is calculated by the CPE according to the downlink synchronization symbol sent by the network side device.
The method according to any one of claims 1 to 3, further comprising:

The network side device changes the time slot resource;

The network side device sends a second indication message to the at least two CPEs, where the second indication message indicates the changed time slot resource.
The method according to any one of claims 1-4, wherein after the network side device receives the uplink synchronization symbol on the time slot resource, the method further includes:

The network side device changes a CPE that sends an uplink synchronization symbol in the time slot resource, and the changed CPE is one of the at least two CPEs;

The network side device sends a second indication message to the CPE before the change and the changed CPE, where the second indication message indicates that the CPE before the change does not send the uplink synchronization symbol in the time slot resource, and the changed CPE is The time slot resource transmits an uplink synchronization symbol.
The method according to claim 5, wherein the network side device sends the second indication message to the CPE before the change and the changed CPE, and further includes:

The network side device sends the second indication message to the CPEs other than the changed CPE and the changed CPE among the at least two CPEs.
A method for transmitting a synchronization symbol, comprising:

The user premises equipment CPE receives the first indication information sent by the network side device, where the first indication message indicates that the CPE occupies a slot resource and sends an uplink synchronization symbol in the slot resource, and the network side device passes the The root twisted pair is connected to the user node, the user node connection includes at least two CPEs of the CPE, and the time slot resource is a complete time slot allocated for allocating one of the at least two CPEs, the complete time a time division multiplexed TDD frame in the slot or one symbol in the TDD frame;

The CPE sends an uplink synchronization symbol in the time slot resource.
The method according to claim 7, wherein when the time slot resource is one symbol in the TDD frame, the time slot resource further includes another symbol or symbols of the TDD frame, One or more symbols are used to transmit the error pattern.
The method according to claim 7 or 8, further comprising:

Receiving, by the CPE, a second indication message of the network side device, where the second indication message indicates the changed time slot resource;

The CPE sends an uplink synchronization symbol in the changed slot resource.
The method of any of claims 7-9, further comprising:

Receiving, by the CPE, a third indication message of the network side device, where the third indication message is used to indicate that the CPE does not send an uplink synchronization symbol in the time slot resource;

The CPE stops transmitting data in the slot resource.
A network side device, comprising:

a determining unit, configured to determine to receive an uplink synchronization symbol in a time slot resource, where the network side device connects to the user node by using a twisted pair, the user node connecting at least two customer premises equipment CPE, the at least two CPEs Communicating with the network side device by a time division multiplexing TDD method, where the time slot resource is a complete time slot allocated to one of the at least two CPEs, one TDD frame in the complete time slot, or the a symbol in a TDD frame;

a sending unit, configured to send a first indication message to one of the at least two CPEs, where the first indication message indicates that the CPE occupies the time slot resource and sends an uplink synchronization symbol in the time slot resource;

And a receiving unit, configured to receive an uplink synchronization symbol on the time slot resource.
The network side device according to claim 11, wherein the sending unit is further configured to send the first indication message to other CPEs other than the CPE in the at least two CPEs.
The network side device according to claim 11 or 12, wherein the time slot resource further comprises another symbol or symbols of the TDD frame, and the other symbol or symbols are used for transmitting an error pattern;

The first indication message further indicates that the CPE sends an error pattern in the another one or more symbols, where the error pattern is calculated by the CPE according to the downlink synchronization symbol sent by the network side device.
The network side device according to any one of claims 11-13, wherein the device further comprises:

a first changing unit, configured to change the time slot resource;

The sending unit is further configured to send, to the at least two CPEs, a second indication message, where the second indication message indicates the changed slot resource.
The network side device according to any one of claims 11 to 14, wherein the device further comprises:

a second changing unit, configured to change a CPE that sends an uplink synchronization symbol in the time slot resource, where the changed CPE is one of the at least two CPEs;

The sending unit is configured to send a second indication message to the CPE before the change and the changed CPE, where the second indication message indicates that the CPE before the change does not send the uplink synchronization symbol in the slot resource, and the changed The CPE transmits an uplink synchronization symbol in the slot resource.
The network side device according to claim 15, wherein the sending unit is further configured to send the second to the CPEs other than the changed CPE and the changed CPE among the at least two CPEs Indicate the message.
A customer premises equipment, comprising:

a receiving unit, configured to receive first indication information that is sent by the network side device, where the first indication message indicates that the user premises equipment CPE occupies a slot resource and sends an uplink synchronization symbol in the slot resource, where the network side device Connecting to the user node by a twisted pair, the user node connection comprising at least two CPEs of the CPE, the time slot resource is a complete time slot allocated for allocating one of the at least two CPEs, One TDD frame in a complete time slot or one symbol in the TDD frame;

And a sending unit, configured to send an uplink synchronization symbol in the time slot resource.
The user premise equipment according to claim 17, wherein when the time slot resource is one symbol in the TDD frame, the time slot resource further includes another symbol or symbols of the TDD frame, The other or symbols are used to transmit an error pattern.
The user premises equipment according to claim 17 or 18, wherein the receiving unit is further configured to receive a second indication message of the network side device, where the second indication message indicates a changed time slot resource ;

The sending unit is further configured to send an uplink synchronization symbol in the changed slot resource.
The user premise device according to any one of claims 17 to 19, wherein the receiving unit is further configured to receive a third indication message of the network side device, where the third indication message is used to indicate the The CPE does not send the uplink synchronization symbol in the time slot resource;

The customer premises equipment further includes:

And a stopping unit, configured to stop transmitting data in the time slot resource.
A network side device, comprising: one or more processors, a memory, and a communication interface;

The memory, the communication interface coupled to the one or more processors;

The memory is for storing computer program code, the computer program code comprising instructions, when the one or more processors execute the instruction, the network side device is configured to perform any of claims 1-6 The method of transmitting the synchronization symbol described in the item.
A customer premises equipment, comprising: one or more processors, a memory, and a communication interface;

The memory, the communication interface coupled to the one or more processors;

The memory is for storing computer program code, the computer program code comprising instructions for performing, when the one or more processors execute the instruction, the user premises equipment for performing any of claims 7-10 The method of transmitting the synchronization symbol described in the item.
A transmission system for synchronizing symbols, comprising the network side device according to claim 21 and the user premise device according to claim 22.