CN106937305B

CN106937305B - Time delay management method, transmission network equipment and communication system

Info

Publication number: CN106937305B
Application number: CN201511025368.4A
Authority: CN
Inventors: 廖锦秋; 龚兆明; 欧斯思
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2015-12-30
Filing date: 2015-12-30
Publication date: 2020-10-27
Anticipated expiration: 2035-12-30
Also published as: CN106937305A

Abstract

The invention provides a time delay management method, transmission network equipment and a communication system. The time delay management method comprises the steps that first transmission network equipment receives a first transmission service frame sent by second transmission network equipment on a first path; the first transmission service frame includes first service data information; the first path is a transmission path from the second transmission network equipment to the first transmission network equipment; and the first transmission network equipment determines the transmission time delay of the first path according to the first service data information. The embodiment of the invention can acquire the transmission time delay of the transmission path.

Description

Time delay management method, transmission network equipment and communication system

Technical Field

The embodiments of the present invention relate to communications technologies, and in particular, to a time delay management method, a transmission network device, and a communication system.

Background

With the development of Long Term Evolution (LTE for short) communication technology, mobile bearer networks also change greatly and become more mature. As a main network device in a mobile bearer network, the deployment of a Radio Remote Unit (Radio Remote Unit, RRU) and a baseband processing Unit (Building Base band Unit, BBU) in a Base Station (BS) has also changed greatly.

The distance between the RRU and the BBU of a conventional base station is small, typically within 50 meters, and the RRU and the BBU are connected by optical fibers. However, to facilitate centralized control of multiple base stations, the distance between the RRU and the BBU may be increased, so that the BBUs of multiple base stations are located at one site to form a BBU pool (pool) including multiple BBUs, and an RRU located at another site may be connected to the BBU in the BBU pool through a transmission network. Fig. 1 is a diagram of a network architecture according to the present invention. As shown in fig. 1, RRU 101 may be connected to one transmission network device 102 in a transmission network, and BBU 103 may be connected to another transmission network device 104 in the transmission network. The BBU104 can be one BBU of a BBU pool. The RRU 101 may send service data to the one transmission network device 102, the one transmission network device 102 sends the service data to the another transmission network device 104, and the service data is sent to the BBU 103 through the another transmission network device 104.

For the RRU and the BBU connected by the transmission network device, the distance is long, the transmission delay of the transmission path is usually large, and the requirements of the RRU and the BBU on the delay of service data are high. Therefore, how to obtain the propagation delay of the transmission path is particularly important.

Disclosure of Invention

The embodiment of the invention provides a time delay management method, transmission network equipment and a communication system, which are used for acquiring transmission time delay of a transmission path.

The embodiment of the invention provides a time delay management method, which comprises the following steps:

the first transmission network equipment receives a first transmission service frame sent by the second transmission network equipment on a first path; the first transmission service frame includes first service data information; the first path is a transmission path from the second transmission network equipment to the first transmission network equipment;

and the first transmission network equipment determines the transmission time delay of the first path according to the first service data information.

Optionally, the first service data information includes: forward delay of the first service data frame and the first service data frame; the first service data frame is a service data frame which is received by the second transmission network equipment and sent by the second client equipment; the forward delay of the first service data frame is a time difference between the time when the second transmission network device receives the first service data frame and the first reference time.

Optionally, the determining, by the first transport network device, the transmission delay of the first path according to the first service data information includes:

the first transmission network equipment determines the total time delay of the first path according to the time of receiving the first transmission service frame and the time difference between the first reference time;

and the first transmission network equipment determines the transmission delay of the first path according to the total delay of the first path and the forward delay of the first service data frame.

Optionally, before the first transport network device determines the total delay of the first path according to a time difference between the time of receiving the first transport service frame and the first reference time, the method further includes:

the first transport network device determines a first reference time.

Optionally, the forward delay of the first service data frame is located in the overhead of the first service data frame; the first traffic data frame is located in the payload of the first transport traffic frame.

Optionally, the first transmission service frame further includes: a transmission delay of the second path; the second path is a transmission path from the first transmission network equipment to the second transmission network equipment;

before the first transport network device receives the first transport traffic frame sent by the second transport network device on the first path, the method may further include:

the first transmission network equipment sends a second transmission service frame to the second transmission network equipment on a second path; the second transmission traffic frame includes: second service data information; and the second service data information is used for enabling the second transmission network equipment to determine the transmission delay of the second path.

Optionally, the second service data information includes: forward delay of the second service data frame and the second service data frame; the second service data frame is a service data frame which is received by the first transmission network equipment and sent by the first client equipment;

before the first transmission network device sends the second transmission traffic frame to the second transmission network device on the second path, the method further includes:

the first transmission network equipment determines the forward time delay of the second service data frame according to the time difference between the time of receiving the second service data frame and the second reference time;

the second service data frame and the forward delay of the second service data frame are used for enabling the second transmission network equipment to determine the transmission delay of the second path.

Optionally, the determining, by the first transport network device, the forward delay of the second service data frame according to a time difference between the time of receiving the second service data frame and the second reference time may include:

the first transmission network equipment starts a timer at a second reference time;

if the first transmission network equipment receives the second service data frame, stopping the timer;

and the first transmission network equipment determines the time of the timer as the forward delay of the second service data frame.

Optionally, before the first transport network device starts the timer at the second reference time, the method further includes:

and the first transmission network equipment receives the time delay measurement trigger message.

Optionally, the first transport network device determines, according to the time between the time of receiving the second service data frame and the second reference time, that is before the forward delay of the second service data frame, the method may further include:

the first transport network device determines a second reference time.

Optionally, before the first transmission network device sends the second transmission service frame to the second transmission network device on the second path, the method further includes:

the first transmission network equipment inserts the forward delay of the second service data frame into the overhead of the second service data frame;

and the first transmission network equipment carries the second service data frame in the load of the second transmission service frame.

The time delay management method of the invention can make the acquired transmission time delay of the transmission path more accurate by providing various realization methods for determining the transmission time delay of the transmission path.

Optionally, if the number of the first paths is 1; the number of the second paths is 1; the method may further comprise:

the first transmission network equipment compares the transmission delay of the first path with the transmission delay of the second path;

if the transmission delay of the first path is smaller than that of the second path, the first transmission network equipment performs delay compensation on the first path, so that the transmission delay difference between the first path and the second path is within a first delay range; the first delay range is determined by the first transport network device according to the delay requirement of the first client device.

Optionally, the method may further include:

the first transmission network equipment sends a third transmission service frame to the second transmission network equipment; the third transport traffic frame includes: a transmission delay of the first path; the transmission delay of the first path is used for enabling the second transmission network equipment to compare the transmission delay of the first path with the transmission delay of the second path, if the transmission delay of the first path is larger than the transmission delay of the second path, delay compensation is carried out on the second path, and the transmission delay difference of the first path and the second path is within a second delay range; the second delay range is determined by the second transmission network device according to the delay requirement of the second client device.

Optionally, if the number of the first paths is multiple; the number of the second paths is multiple; the method may further comprise:

the first transmission network equipment compares the transmission time delays of a plurality of first paths;

if the transmission delay of one path in the multiple first paths is greater than the transmission delays of other paths, the first transmission network equipment performs delay compensation on the other first paths, so that the transmission delay difference of different paths in the multiple first paths is within a first delay range; the first time delay range is determined by the first transmission network equipment according to the time delay requirement of the first client equipment;

the first transmission network equipment compares the maximum transmission time delay in a plurality of first paths with the maximum transmission time delay in a plurality of second paths;

if the maximum transmission delay in the multiple first paths is smaller than the maximum transmission delay in the multiple second paths, the first transmission network device performs delay compensation on the multiple first paths, so that the difference between the maximum transmission delay in the multiple first paths and the transmission delay in the multiple second paths is within a first delay range.

Optionally, the method may further include:

the first transmission network equipment sends a fourth transmission service frame to the second transmission network equipment; the fourth transmission traffic frame includes: transmission delays of a plurality of first paths; the transmission time delays of the multiple first paths are used for enabling the second transmission network equipment to compare the maximum transmission time delay of the multiple first paths with the maximum transmission time delay of the multiple second paths, if the maximum transmission time delay of the multiple first paths is larger than the maximum transmission time delay of the multiple second paths, time delay compensation is carried out on the multiple second paths, and the difference between the maximum transmission time delay of the multiple first paths and the transmission time delay of the multiple second paths is within a second time delay range; the second delay range is determined by the second transmission network device according to the delay requirement of the second client device.

The time delay management method of the invention can carry out time delay compensation according to the acquired transmission time delay on the basis of acquiring the transmission time delay of the transmission path, and can ensure that the service data transmitted to the client equipment through the transmission path between two transmission network devices meets the time delay requirement of the client equipment, thereby ensuring the accurate receiving of the service data by the client equipment and avoiding the loss of the service data.

An embodiment of the present invention further provides a transmission network device, where the transmission network device is a first transmission network device, and the transmission network device includes:

a receiving module, configured to receive a first transmission service frame sent by a second transmission network device on a first path; the first transmission service frame includes first service data information; the first path is a transmission path from the second transmission network equipment to the first transmission network equipment;

and the determining module is used for determining the transmission delay of the first path according to the first service data information.

Optionally, the first service data information includes: forward delay of the first service data frame and the first service data frame; the first service data frame is a service data frame which is received by the second transmission network equipment and sent by the second client equipment;

the forward delay of the first service data frame is a time difference between the time when the second transmission network device receives the first service data frame and the first reference time.

Optionally, the determining module is further configured to determine a total time delay of the first path according to a time difference between the time of receiving the first transmission service frame and the first reference time; and determining the transmission delay of the first path according to the total delay of the first path and the forward delay of the first service data frame.

Optionally, the determining module is further configured to determine the first reference time before determining the total delay of the first path according to a time difference between the time when the first transmission service frame is received and the first reference time.

the transmission network apparatus may further include:

a sending module, configured to send a second transmission service frame to a second transmission network device on a second path before the receiving module receives the first transmission service frame sent by the second transmission network device on the first path; the second transmission traffic frame includes: second service data information; and the second service data information is used for enabling the second transmission network equipment to determine the transmission delay of the second path.

the determining module is further configured to determine, before the sending module sends the second transmission service frame to the second transmission network device on the second path, a forward delay of the second service data frame according to a time difference between the time when the second service data frame is received and the second reference time;

Optionally, the determining module is further configured to start a timer at the second reference time, stop the timer if the second service data frame is received, and determine the time of the timer as the forward delay of the second service data frame.

Optionally, the receiving module is further configured to receive a delay measurement trigger message.

Optionally, the determining module is further configured to determine the second reference time before determining the forward delay of the second service data frame according to a time difference between the time when the second service data frame is received and the second reference time.

Optionally, the transmission network device further includes: a processing module;

and the processing module is used for inserting the forward delay of the second service data frame into the overhead of the second service data frame before the sending module sends the second transmission service frame to the second transmission network equipment on the second path, and carrying the second service data frame in the load of the second transmission service frame.

The present invention also provides a communication system comprising: the remote radio unit and the baseband processing unit are arranged with an optical transmission network; the optical transmission network comprises a plurality of transmission network devices for realizing communication connection between the radio remote unit and the baseband processing unit;

wherein, transmission network equipment includes: a receiving module and a determining module;

a receiving module, configured to receive a first transmission service frame sent by another transmission network device on a first path; the first transmission service frame includes first service data information; the first path is a transmission path from another transmission network device to a transmission network device; and the determining module is used for determining the transmission delay of the first path according to the first service data information.

According to the time delay management method, the transmission network equipment and the communication system provided by the embodiment of the invention, a first transmission service frame sent by second transmission network equipment on a first path can be received through first transmission network equipment; the first path is a transmission path from the second transmission network equipment to the first transmission network equipment; and determining the transmission delay of the first path through the first transmission network equipment according to the first service data information included in the first transmission service frame. Therefore, the embodiment of the invention can acquire the transmission time delay of the transmission path and then adjust according to the acquired time delay, thereby ensuring the transmission reliability of the service data.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a diagram of a network architecture of the present invention;

fig. 2 is a flowchart of a latency management method according to the present invention;

fig. 3 is a flowchart of a latency management method according to the present invention;

fig. 4 is a schematic structural diagram of a CPRI service frame provided by the present invention;

fig. 5 is a schematic structural diagram of another CPRI service frame provided by the present invention;

fig. 6 is a schematic structural diagram of another CPRI service frame provided by the present invention;

FIG. 7 is a schematic structural diagram of a network system provided in the present invention;

fig. 8 is a flowchart of a latency management method according to the present invention;

fig. 9 is a schematic structural diagram of a transmission network device provided in the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiments of the present invention can obtain the transmission delay of the transmission path between two transmission network devices by providing the delay management method and the transmission network device, and then perform delay adjustment, such as compensation, through the obtained transmission delay of the transmission path, thereby ensuring the reliability of service data transmission. The two transport network devices can each be connected to a client device, i.e. one client device can be connected to a transport network device in a transport network and the other client device is connected to another transport network device of the transport network. The transmission network is also referred to as a transmission backbone network. For example, the transport Network may be, for example, an Optical Transport Network (OTN), and then both the first transport Network device and the second transport Network device may be OTN devices, and the first transport Network device may be connected to the second transport Network device through an optical fiber cable. The first transmission network device may be connected to the first client device through a Common Public Radio Interface (CPRI), and the second transmission network device may also be connected to the second client device through a CPRI interface. The client device may be an RRU or a BBU in a BBU pool, and if the first client device is an RRU, the second client device may be a BBU. If the first client device is a BBU, the second client device may be an RRU.

The embodiment of the invention provides a time delay management method. The method may be performed by a transport network apparatus, such as a first transport network apparatus. Fig. 2 is a flowchart of a latency management method provided in the present invention. As shown in fig. 2, the method of this embodiment includes:

s201, a first transmission network device receives a first transmission service frame sent by a second transmission network device on a first path; the first transmission service frame includes first service data information, and the first path may be a transmission path from the second transmission network device to the first transmission network device.

The first path may be a transmission path from the second transmission network device to the first transmission network device, that is, the first path is a unidirectional transmission path from the second transmission network device to the first transmission network device. That is, the second transport network device may send information to the first transport network device on the first path, and the first transport network device may receive information sent by the second transport network device on the first path.

For example, if the first client device is a BBU and the second client device is an RRU, the first path may be a downlink path from the second transmission network device to the first transmission network device. If the first client device is an RRU and the second client device is a BBU, the first path may be an uplink path from the second transmission network device to the first transmission network device.

If the first transmission network device and the second transmission network device are OTN devices, the first transmission service frame may be an OTN frame.

S202, the first transport network device determines a transmission delay of the first path according to the first service data information.

For example, the first transport network device may determine the transmission delay of the first path according to the time of the service data in the second transport network device and the time of the service data received by the first transport network device. The first service data information may include, for example, the time of the service data at the second transmission network device, that is, the time of the service data at the second transmission network device may be sent by the second transmission network device. The time when the first transport network device receives the service data may be determined when the first transport network device receives the first transport service frame on the first path.

In the latency management method provided by the embodiment of the present invention, a first transmission network device may receive a first transmission service frame sent by a second transmission network device on a first path; the first path is a transmission path from the second transmission network equipment to the first transmission network equipment; and determining the transmission delay of the first path through the first transmission network equipment according to the first service data information included in the first transmission service frame. Therefore, the embodiment of the invention can acquire the transmission time delay of the transmission path and then adjust according to the acquired time delay, thereby ensuring the transmission reliability of the service data.

Optionally, the first service data information may include: a first traffic data frame and a forward delay (Forwad delay) of the first traffic data frame. The first service data frame is a service data frame sent by the second client device and received by the second transmission network device; the forward delay of the first service data frame is a time difference between the time when the second transmission network device receives the first service data frame and a first reference time.

The starting and counting of the reference time in the present invention can be performed by various existing schemes, such as being configured by 1588 clock of the transmission network device, or being determined by timestamp of the service frame header transmission.

Fig. 3 is a flowchart of a latency management method according to an embodiment of the present invention. As shown in fig. 3, optionally, before the first transport network device receives the first transport service frame sent by the second transport network device on the first path in S201, the method may further include:

s301, the second transmission network device receives the first service data frame sent by the second client device.

S302, the second transmission network device determines the forward delay of the first service data frame according to a time difference between the time of receiving the first service data frame and the first reference time.

That is, the second transmission network device may receive the first service data frame sent by the second client device after the forward delay of the first service data frame arrives from the first reference time.

Optionally, the determining, by the second transmission network device, the forward delay of the first service data frame according to a time difference between the time of receiving the first service data frame and the first reference time may include:

the second transmission network device starts a timer at the first reference time;

the second transmission network equipment receives the first service data frame and stops the timer;

the second transmission network device determines the time of the timer as the forward delay of the first service data frame.

Specifically, the first service data Frame may also be referred to as a Client service Frame (Client Frame). The second transport network device may determine whether the first traffic data frame is received, for example, by detecting a header of the first traffic data frame. And if the second transmission network equipment detects the frame header of the first service data frame, determining that the second transmission network equipment receives the first service data frame.

For example, if the second client device is connected to the second transport network device through a CPRI interface, the first service data frame may be a CPRI service frame. Fig. 4 is a schematic structural diagram of a CPRI service frame provided by the present invention. As shown in fig. 4, one CPRI service Frame may include 150 CPRI superframes (Hyper frames, HF for short). Wherein each CPRI superframe may include 256 CPRI basic frames. Each CPRI basic frame may include 16 bytes, each of which may be 4B, i.e., 32 bits (bits), for example. The 16 bytes include a control byte of one byte and a data byte of 15 bytes. The data bytes may be, for example, data In-phase (I) or Quadrature (Q) signal format. Wherein the control byte may include a control character and a data byte, and the control character may be K28.5 or S. If the control character in the control byte is K28.5, the data in the data byte in the control byte can be encoded by 8B/10B; if the control word in the control byte is S, the data in the data byte in the control byte may be encoded in a 64B/66B manner.

The frame header of the first service data frame may include: the superframe header of the first service data frame may include: a base frame header. The base frame header may be a control byte of the base frame.

In order to facilitate the transmission network device to detect the superframe header of the service data frame and reduce the bandwidth brought by coding, the embodiment of the invention also provides a CPRI service frame, the position of each basic frame with preset number at intervals in the CPRI service frame has an indication field, and the indication field can include the indication information of the position of the superframe of the CPRI service frame. The second transmission network device may determine the superframe header of the first service data frame by detecting the location indication information of the superframe of the first service data frame, where the location indication information of the superframe of the first service data frame may be located at the location of the basic frames spaced by the preset number in the superframe of the first service data frame.

Fig. 5 is a schematic structural diagram of another CPRI service frame provided by the present invention. As shown in fig. 5, the position of the CPRI service frame, which may be a super frame, that is, 256 basic frames, has an indication field, which may include indication information of the position of the CPRI service frame super frame and overhead indication information of the CPRI service frame super frame. The indication field may include 8 bytes. The indication information of the location of the CPRI service Frame superframe may be located in a Frame Alignment (FA) field, and may be used to indicate the location of the client service Frame. The OverHead indication information of the CPRI service frame super-frame may be located in OverHead (OH). The 8-byte indication field may include 2 bytes of FA and 6 bytes of OH.

It should be noted that fig. 5 is only an example, and there may also be an indication field in the CPRI service frame for the position of the basic frame with other number per interval, where the byte number of the indication field is not limited to the above 8 bytes, and may also be other bytes, and moreover, the position of the indication information of the position of the CPRI service frame superframe in the indication field may also be other configurations, which is not described herein again.

S303, the second transmission network device sends the first service data frame and the forward delay of the first service data frame to the first transmission network device through the first transmission service frame on the first path.

As described above, in S202, the determining, by the first transport network device, the transmission delay of the first path according to the first service data information may include:

s304, the time difference between the time when the first transport network device receives the first transport service frame and the first reference time is determined as the Total delay (Total Latency) of the first path.

S305, the first transport network device determines the transmission delay of the first path according to the total delay of the first path and the forward delay of the first service data frame.

Specifically, the first transport network device may determine the transmission delay of the first path according to a time difference between the total delay of the first path and the forward delay of the first traffic data frame.

Optionally, as described above, before the time difference between the time when the first transport network device receives the first transport service frame and the first reference time is determined as the total delay of the first path in S304, the method may further include:

the first transport network device determines the first reference time.

Optionally, as described above, determining, by the first transport network device, a time difference between the time when the first transport service frame is received and the first reference time as the total delay of the first path, may include:

the first transmission network equipment starts a timer at the first reference time;

the first transmission network equipment receives the first transmission service frame and stops the timer;

the first transport network device determines the time of the timer as the total delay of the first path.

In particular, the first transport network device and the second transport network device have the same first reference time. That is, the first reference time taken by the second transport network device to determine the first service data frame is the same as the first reference time taken by the first transport network device to determine the total delay of the first path.

Optionally, as described above, the sending, by the second transport network device in S303, the first service data frame and the first service data frame to the first transport network device on the first path through the first transport service frame may include:

the second transmission network equipment inserts the forward delay of the first service data frame into the overhead of the first service data frame and carries the first service data frame in the first transmission service frame;

the second transport network device sends the first transport network service frame to the first transport network device on the first path.

Specifically, the second transmission network device may implement alignment of forward delays of the first data service frame and the first data service frame by inserting the forward delay of the first data service frame into the first data service frame. Wherein, the second transmission network device may insert the forward delay of the first data service frame into the overhead of the indication field in the first data service frame. Fig. 6 is a schematic structural diagram of another CPRI service frame provided by the present invention. The CPRI service frame may have an indication field at a position spaced apart by a predetermined number, that is, the indication field exists periodically in the CPRI service frame. As shown in fig. 6, the CPRI service frame may be a superframe-apart, i.e., 256 basic frames have an indication field at their positions. The first transport network device may, for example, insert the forward delay of the first data service frame as overhead indication information of a CPRI service frame super-frame into the overhead of the indication field. Specifically, the overhead may include: delay (LaTency, LT for short) 1 to delay 4, Type (Type), check code. Wherein, the time delays 1 to 4 can be used to carry specific time delay information. The type can be used to indicate whether the delay information in the delays 1 to 4 is valid, and whether the delay information is forward delay or backward delay. The Check code may be a Cyclic Redundancy Check (CRC).

Therefore, the second transport network device may be of a type that inserts the forward delay of the first data traffic frame into any one of delay 1 to delay 4 in the overhead of the indication field, and inserts the type of the forward delay of the first data traffic frame into the overhead of the indication field, and adds a validation code.

The second transport network device may be configured to carry the first traffic data frame in a payload of the first transport traffic frame. The second transmission network device may use the first data service data frame added with the forward delay of the first service data frame as a data load, add transmission overhead, and encapsulate to form the first transmission service frame.

Optionally, the first transmission service frame may further include: a transmission delay of the second path; the second path is a transmission path from the first transmission network device to the second transmission network device.

For example, if the first client device is a BBU and the second client device is an RRU, the second path may be an uplink path from the first transmission network device to the second transmission network device. If the first client device is an RRU and the second client device is a BBU, the second path may be a downlink path from the first transmission network device to the second transmission network device.

Before the first transport network device receives the first transport traffic frame sent by the second transport network device on the first path in S201 as described above, the method may further include:

the first transmission network equipment sends a second transmission service frame to the second transmission network equipment on a second path; the second transport service frame includes: the second service data information; the second service data information is used for enabling the second transmission network device to determine the transmission delay of the second path.

Optionally, the second service data information includes: a second service data frame and a forward delay of the second service data frame; the second service data frame is a service data frame sent by the first client device and received by the first transport network device.

Before the first transport network device sends the second transport traffic frame to the second transport network device on the second path in the above-mentioned steps, the method may further include:

and the first transmission network equipment determines the forward delay of the second service data frame according to the time difference between the time of receiving the second service data frame and the second reference time.

The second transmission network device may determine the transmission delay of the second path according to the second service data frame and the forward delay of the second service data frame.

Optionally, in the foregoing step, the determining, by the first transport network device, the forward delay of the second service data frame according to a time difference between the time of receiving the second service data frame and a second reference time includes:

the first transmission network equipment starts a timer at the second reference time;

if the first transport network equipment receives the second service data frame, stopping the timer;

and the first transport network equipment determines the time of the timer as the forward delay of the second service data frame.

Optionally, before the first transport network apparatus starts the timer at the second reference time, the method further includes:

the first transport network device receives a delay measurement trigger message.

Optionally, the determining, by the second transmission network device, the transmission delay of the second path according to the second service data frame and the forward delay of the second service data frame may include:

the time when the second transmission network device receives the second transmission service frame and the time difference between the second reference time are determined as the total time delay of the second path, and the transmission time delay of the second path is determined according to the total time delay of the second path and the forward time delay of the second service data frame.

Specifically, the process in which the second transmission network device can determine the transmission delay of the second path is similar to the process in which the first transmission network device determines the transmission delay of the first path, and is not described herein again.

Optionally, before the first transport network device determines the forward delay of the second service data frame according to the time between the time when the second service data frame is received and the second reference time, the method further includes:

the first transport network device determines the second reference time.

Optionally, before the first transmission network device sends the second transmission traffic frame to the second transmission network device on the second path, the method may further include:

Specifically, the process that the first transmission network device inserts the forward delay of the second data service frame into the overhead of the second data service frame, and the process that the second transmission network device inserts the forward delay of the first transmission network device into the first data service frame in the above embodiment are not described herein again. The process of the first transmission network device carrying the second service data frame on the load of the second transmission service frame may be similar to the process of the second transmission network device carrying the first data service frame on the load of the first transmission service frame, and is not described herein again.

Optionally, if the number of the first paths is 1, the number of the second paths is 1. The method may further comprise:

the first transport network equipment compares the transmission delay of the first path with the transmission delay of the second path;

if the transmission delay of the first path is smaller than the transmission delay of the second path, the first transport network device performs delay compensation on the first path, so that the difference between the transmission delay of the first path and the transmission delay of the second path is within a first delay range. The first delay range is determined by the first transport network device according to the delay requirement of the first client device.

Specifically, the first transport network device may perform compensation on the first path according to a difference between the transmission delay of the first path and the transmission delay of the second path, so that the compensated transmission delay of the second path is symmetrical to, that is, equal to, the transmission delay of the second path. If the transmission delay of the first path is greater than or equal to the transmission delay of the second path, the first transport network device does not compensate.

The first range of delays may be determined by the first transport network device based on the delay requirements of the first client device. The latency requirements may include: the range of delay jitter. If the transmission delay of the first path is smaller than the transmission delay of the second path, the first transport network device performs delay compensation on the first path, so that the transmission delay difference between the first path and the second path is within the first delay range, that is, is smaller than or equal to the delay requirement of the first client device, such as the delay jitter range.

Optionally, the method may further include:

the first transmission network equipment sends a third transmission service frame to the second transmission network equipment; the second transport service frame includes: a transmission delay of the first path;

the second transmission network device compares the transmission delay of the first path with the transmission delay of the second path;

if the transmission delay of the first path is greater than the transmission delay of the second path, the second transmission network equipment performs delay compensation on the second path, so that the transmission delay difference between the first path and the second path is within a second delay range; the second delay range is determined by the second transmission network device according to the delay requirement of the second client device.

And if the transmission delay of the first path is less than or equal to the transmission delay of the second path, the second transmission network equipment does not compensate.

Alternatively, if the number of the first paths is multiple; the number of the second paths is multiple; the method may further comprise:

the first transmission network equipment compares the transmission time delays of the plurality of first paths;

if the transmission delay of one path in the first paths is longer than the transmission delays of other paths, the first transmission network equipment performs delay compensation on the other first paths, so that the transmission delay difference of different paths in the first paths is within a first delay range; the first time delay range is determined by the first transmission network equipment according to the time delay requirement of the first client equipment;

the first transport network device comparing the maximum transmission delay in the first paths with the maximum transmission delay in the second paths;

if the maximum transmission delay in the first paths is smaller than the maximum transmission delay in the second paths, the first transport network device performs delay compensation on the first paths, so that the difference between the maximum transmission delay in the first paths and the transmission delay in the second paths is within a first delay range.

Specifically, the plurality of first paths may include a first main path and at least one first standby path. The plurality of second paths may include a second main path and at least one second standby path. The first transmission network equipment compares the transmission time delays of the multiple first paths, and if the transmission time delay of one path in the multiple first paths is larger than the transmission time delays of other paths, the first transmission network equipment performs time delay compensation on the other first paths, so that the time delays of the compensated multiple second paths are the same, namely the time delays of the main and standby second paths are the same.

Optionally, the method may further include:

the first transmission network equipment sends a fourth transmission service frame to the second transmission network equipment; the fourth transmission service frame includes: a transmission delay of the plurality of first paths;

the second transmission network equipment compares the maximum transmission time delay in the plurality of first paths with the maximum transmission time delay in the plurality of second paths, and if the maximum transmission time delay in the plurality of first paths is greater than the maximum transmission time delay in the plurality of second paths, performs time delay compensation on the plurality of second paths so that the difference between the maximum transmission time delay in the plurality of first paths and the transmission time delay in the plurality of second paths is within a second time delay range; the second delay range is determined by the second transmission network device according to the delay requirement of the second client device.

The embodiment of the invention can better ensure that the service data transmitted to the client equipment through the transmission path between the two transmission network devices meets the time delay requirement of the client equipment by providing various time delay management methods and providing various transmission time delays for determining the path and compensating, thereby ensuring the accurate receiving of the service data by the client equipment and avoiding the loss of the service data.

The embodiment of the invention also provides a time delay compensation method. The embodiment specifically describes the delay compensation method according to the foregoing embodiment by taking the first transmission network device and the second transmission network device as specific examples. Fig. 7 is a schematic structural diagram of a network system provided in the present invention. As shown in fig. 7, the network system may include a first client device, a first transport network device, a second transport network device, and a second client device. The first client device may be a BBU in a BBU pool, the first transport network device may be a first OTN device, and the first client device may be connected to the first transport network device through a CPRI interface. The second client device may be an RRU, the second transmission network device may be a second OTN device, and the second client device may be connected to the second transmission network device through a CPRI interface. The first transport network device and the second transport network device may be connected by an OTN link, such as an optical fiber.

Fig. 8 is a flowchart of a latency management method according to the present invention. As shown in fig. 8, the method may include:

s801, the first client device sends a first service data frame to the first transport network device.

The first traffic data frame may include CPRI traffic data.

S802, the first transmission network equipment receives a first measurement trigger message.

The first transport network device may receive the first measurement trigger message through a first timer.

And S803, the first transmission network equipment starts a first timer according to the first reference time.

The first transport network device may start a first timer when the first reference time arrives.

S804, the second transmission network device starts a second timer according to the first reference time.

The second transmission network device may start a second timer when the first reference time arrives.

S805, the first transport network device determines that the first transport network device receives the first service data frame by detecting a frame header of a superframe of the first service data frame, and stops the first timer.

The first transport network device may detect a Frame header of a superframe of the first service data Frame through a first superframe Alignment module (Hyper Frame Alignment).

S806, the first transport network device determines the time of the first timer as the forward delay of the first service data frame.

The forward delay of the first traffic data frame may also be referred to as the first forward delay.

S807, the first transport network device inserts the forward delay of the first service data frame into the overhead of the first service data frame.

The first transport network device may convert the forward delay of the first traffic data frame into an OverHead format of the traffic data frame through a first OverHead generator (OverHead generator), and then insert the OverHead of the first traffic data frame through the first framer. The first Framer may be a CPRI Framer (CPRI Framer)

It should be noted that, the first transport network device further encodes the first service data frame through the first encoder. The first encoder may be a 10B8B encoder and the first transport network device may be a 10B8B encoder for the first traffic data frame. The first encoder may also be a 66B64B encoder and the first transport network device may be a 66B64B encoder for the first traffic data frame.

S808, the first transmission network device generates a first transmission service frame according to the first service data frame inserted with the forward delay of the first service data frame.

The first transport network device may generate, by the second framer, a first transport traffic frame from the first traffic data frame inserted with the forward delay of the first traffic data frame. The second framer may be an OTN framer (OTNFramer), and the first transport traffic frame may be an OTN frame.

S809, the first transmission network device sends the first transmission service frame to the second transmission network device on the first path.

After receiving the first transmission service frame, the second transmission network device may perform frame decoding according to a second deframer to obtain the first service data frame including the forward delay of the first service data frame. The second transmission network device further performs frame decoding through a first deframer to obtain information carried by the first service data frame, and further obtains a forward delay of the first service data frame in the first service data frame through a first Overhead Interpreter (Overhead Interpreter). The second DeFramer may be an OTN DeFramer (OTN DeFramer) corresponding to the second framer, and the first framer may be a CPRI DeFramer (CPRI DeFramer) corresponding to the first framer.

S810, the second transmission network device determines that the second transmission network device receives the first service data frame by detecting a superframe header of the first service data frame in the first transmission service frame, and stops the second timer.

The second transmission network device may perform frame header alignment on the first service data frame output by the first frame receiver through the second superframe alignment module, perform decoding through the first decoder to obtain a superframe frame header of the first service data frame, and determine that the second transmission network device receives the first service data frame.

S811, the second transmission network device determines the time of the second timer as the total time delay of the first path, and determines the transmission time delay of the first path according to the difference between the total time delay of the first path and the forward time delay of the first service data frame.

The total delay of the first path may be the first total delay in fig. 7, and the transmission delay of the first path may be the first transmission delay in fig. 7.

S812, the second client device sends the second service data frame to the second transmission network device.

The second service data frame may also include CPRI service data.

S813, the second transmission network device receives the second measurement trigger message.

The second transmission network device may receive the second measurement trigger message through a third timer.

And S814, the second transmission network equipment starts a third timer according to the second reference time.

The second transmission network device may start a third timer when the second reference time arrives.

S815, the first transport network device starts a fourth timer according to the second reference time.

S816, the second transmission network device determines that the second transmission network device receives the second service data frame by detecting a frame header of a superframe of the second service data frame, and stops the third timer.

The second transmission network device may detect a frame header of a superframe of the second service data frame through a third superframe alignment module.

S817, the second transmission network device determines the time of the third timer as the forward delay of the second service data frame.

The forward delay of the second traffic data frame may also be referred to as a second forward delay.

S818, the second transmission network device inserts the forward delay of the second service data frame and the transmission delay of the first path into the overhead of the second service data frame.

The second transport network device may convert the forward delay of the second traffic data frame and the transmission delay of the first path into the overhead of the traffic data frame through a second overhead generator, and then insert the overhead of the second traffic data frame through the third framer. The third Framer may be a CPRI Framer (CPRI Framer).

It should be noted that the second transport network device further encodes the second service data frame through a second encoder. The second encoder may be a 10B8B encoder and the second transport network device may be a 10B8B encoder for the second traffic data frame. The second encoder may be a 66B64B encoder and the second transport network device may be a 66B64B encoder for the second traffic data frame.

S819, the second transmission network device generates a second transmission service frame according to the second service data frame inserted with the forward delay of the second service data frame and the transmission delay of the first path.

The second transport network device may generate, by the fourth framer, a second transport service frame according to the second service data frame inserted with the forward delay of the second service data frame and the transport delay of the first path. The fourth Framer may be an OTN Framer (OTN Framer), and the second transport traffic frame may be an OTN frame.

S820, the second transmission network device sends the second transmission service frame to the first transmission network device on the second path.

After receiving the second transmission network device, the first transmission network device may perform frame decoding according to a fourth deframer to obtain the second service data frame including the forward delay of the second service data frame and the transmission delay of the first path. The first transport network device further performs frame decoding through a third deframer to obtain information carried by the second service data frame, and further obtains a forward delay of the second service data frame and a transmission delay of the first path in the second service data frame through a second Overhead Interpreter (Overhead Interpreter). The fourth DeFramer may be an OTN DeFramer (OTN DeFramer) corresponding to the fourth framer, and the third framer may be a CPRI DeFramer (CPRIDeFramer) corresponding to the third framer.

S821, the first transport network device determines that the first transport network device receives the second service data frame by detecting a superframe header of the second service data frame in the second transport service frame, and stops the fourth timer.

The first transport network device may perform frame header alignment on the second service data frame output by the third frame receiver through a fourth superframe alignment module, perform decoding through a second decoder to obtain a superframe frame header of the second service data frame, and determine that the first transport network device receives the second service data frame.

S822, the first transmission network device determines the time of the fourth timer as the total delay of the second path, and determines the transmission delay of the second path according to the difference between the total delay of the second path and the forward delay of the second service data frame.

The total delay of the second path may be the second total delay in fig. 7, and the transmission delay of the first path may be the second transmission delay in fig. 7.

S823, the first transport network equipment compares the transmission delay of the first path with the transmission delay of the second path.

S824, if the transmission delay of the first path is greater than the transmission delay of the second path, the first transport network device performs compensation on the second path.

The first transport network device may configure the second compensation module on the second path according to a difference between a transmission delay of the first path and a transmission delay of the second path, and compensate the second path through the second compensation module.

S825, if the transmission delay of the second path is greater than the transmission delay of the first path, the first transmission network device sends the transmission delay of the first path to the second transmission network device through the third transmission service frame in the first path.

S826, the second transmission network device compensates on the first path.

The second transmission network device may configure the first compensation module on the first path according to a difference between a transmission delay of the second path and a transmission delay of the first path, and compensate the first path through the first compensation module.

The method for managing time delay provided by the embodiments of the present invention is specifically described in the embodiments by specific examples, and the beneficial effects are similar to those of the embodiments and are not described herein again.

The embodiment of the invention also provides transmission network equipment. Fig. 9 is a schematic structural diagram of a transmission network device provided in the present invention. As shown in fig. 9, the transport network apparatus 900 may be a first transport network apparatus. The transmission network apparatus 900 may include: a receiving module 901 and a determining module 902.

The receiving module 901 may be implemented by a receiver, and the determining module 902 may be implemented by a processor. The processor may be a Central Processing Unit (CPU) or other general-purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, a discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

A receiving module 901, configured to receive a first transmission service frame sent by a second transmission network device on a first path; the first transmission service frame includes first service data information; the first path is a transmission path from the second transmission network device to the first transmission network device.

A determining module 902, configured to determine a transmission delay of the first path according to the first service data information.

Optionally, the first service data information includes: a first service data frame and a forward delay of the first service data frame; the first service data frame is a service data frame sent by the second client device and received by the second transmission network device.

The forward delay of the first service data frame is a time difference between the time when the second transmission network device receives the first service data frame and a first reference time.

Optionally, the determining module 902 is further configured to determine the total delay of the first path according to the time when the first transmission service frame is received and a time difference between the first reference time; and determining the transmission delay of the first path according to the total delay of the first path and the forward delay of the first service data frame.

Optionally, the determining module 902 is further configured to determine the first reference time before determining the total delay of the first path according to a time difference between the time when the first transmission service frame is received and the first reference time.

optionally, the transmission network apparatus 900 further includes:

a sending module, configured to send a second transmission service frame to the second transmission network device on a second path before the receiving module 901 receives the first transmission service frame sent by the second transmission network device on the first path; the second transport service frame includes: the second service data information; the second service data information is used for enabling the second transmission network device to determine the transmission delay of the second path.

A determining module 902, further configured to determine, before the sending module 901 sends the second transmission service frame to the second transmission network device on the second path, a forward delay of the second service data frame according to a time difference between the time when the second service data frame is received and a second reference time;

the second service data frame and the forward delay of the second service data frame are used to enable the second transmission network device to determine the transmission delay of the second path.

Optionally, the determining module 902 is further configured to start a timer at a second reference time, stop the timer if the second service data frame is received, and determine the time of the timer as the forward delay of the second service data frame.

Optionally, the receiving module 901 is further configured to receive a delay measurement trigger message.

Optionally, the determining module 902 is further configured to determine the second reference time before determining the forward delay of the second service data frame according to a time difference between the time when the second service data frame is received and the second reference time.

Optionally, the transmission network apparatus 900 further includes: a processing module;

a processing module, configured to insert the forward delay of the second service data frame into the overhead of the second service data frame before the sending module sends the second transmission service frame to the second transmission network device on the second path, and carry the second service data frame in the load of the second transmission service frame.

The transmission network device provided in the embodiment of the present invention may execute the delay management method executed by the first transmission network device in any of the above embodiments, and the beneficial effects are similar to those of the above embodiments, and are not described herein again.

Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for latency management, comprising:

the first transmission network equipment receives a first transmission service frame sent by the second transmission network equipment on a first path; the first transmission service frame comprises first service data information; the first path is a transmission path from the second transmission network equipment to the first transmission network equipment; wherein the first service data information includes: a first service data frame and a forward delay of the first service data frame; the first service data frame is a service data frame sent by a second client device and received by the second transmission network device; the forward delay of the first service data frame is a time difference between the time when the second transmission network equipment receives the first service data frame and a first reference time;

2. The method of claim 1, wherein the first transport network device determines the total delay of the first path based on a time difference between the time of receiving the first transport traffic frame and the first reference time, and further comprising:

the first transport network device determines the first reference time.

3. The method according to claim 1 or 2,

the forward delay of the first service data frame is located in the overhead of the first service data frame; the first traffic data frame is located in a payload of the first transport traffic frame.

4. The method of claim 1 or 2, wherein the first transport traffic frame further comprises: a transmission delay of the second path; the second path is a transmission path from the first transmission network equipment to the second transmission network equipment;

before the first transport network device receives the first transport traffic frame sent by the second transport network device on the first path, the method further includes:

the first transmission network equipment sends a second transmission service frame to the second transmission network equipment on a second path; the second transport traffic frame includes: second service data information; the second service data information is used for enabling the second transmission network device to determine the transmission delay of the second path.

5. The method of claim 4, wherein the second service data information comprises: a second service data frame and a forward delay of the second service data frame; the second service data frame is a service data frame sent by the first client device and received by the first transmission network device;

the first transmission network equipment determines the forward time delay of the second service data frame according to the time difference between the time of receiving the second service data frame and a second reference time;

the second service data frame and the forward delay of the second service data frame are used for enabling the second transmission network device to determine the transmission delay of the second path.

6. The method of claim 5, wherein the determining, by the first transport network device, the forward delay of the second traffic data frame according to the time difference between the time of receiving the second traffic data frame and a second reference time comprises:

and the first transmission network equipment determines the time of the timer as the forward time delay of the second service data frame.

7. The method of claim 6, wherein the first transport network device starts a timer at the second reference time, the method further comprising:

and the first transmission network equipment receives a time delay measurement trigger message.

8. The method of claim 5, wherein the first transport network device determines the forward delay of the second traffic data frame according to a time between the time of receiving the second traffic data frame and a second reference time, and further comprising:

the first transport network device determines the second reference time.

9. The method of claim 5,

10. A transmission network apparatus, characterized in that the transmission network apparatus is a first transmission network apparatus, the transmission network apparatus comprising:

a receiving module, configured to receive a first transmission service frame sent by a second transmission network device on a first path; the first transmission service frame comprises first service data information; the first path is a transmission path from the second transmission network equipment to the first transmission network equipment; wherein the first service data information includes: a first service data frame and a forward delay of the first service data frame; the first service data frame is a service data frame sent by a second client device and received by the second transmission network device;

the forward delay of the first service data frame is a time difference between the time when the second transmission network equipment receives the first service data frame and a first reference time;

a determining module, configured to determine a total time delay of the first path according to a time difference between the time when the first transmission service frame is received and the first reference time; and determining the transmission delay of the first path according to the total delay of the first path and the forward delay of the first service data frame.

11. Transmission network device according to claim 10,

the determining module is further configured to determine the first reference time before determining the total delay of the first path according to a time difference between the time when the first transmission service frame is received and the first reference time.

12. Transmission network device according to claim 10 or 11, characterized in that the forward delay of the first traffic data frame is located in the overhead of the first traffic data frame; the first traffic data frame is located in a payload of the first transport traffic frame.

13. Transport network device according to claim 10 or 11, characterized in that said first transport traffic frame further comprises: a transmission delay of the second path; the second path is a transmission path from the first transmission network equipment to the second transmission network equipment;

the transmission network device further includes:

a sending module, configured to send a second transmission service frame to the second transmission network device on a second path before the receiving module receives the first transmission service frame sent by the second transmission network device on the first path; the second transport traffic frame includes: second service data information; the second service data information is used for enabling the second transmission network device to determine the transmission delay of the second path.

14. The transport network device of claim 13, wherein the second service data information comprises: a second service data frame and a forward delay of the second service data frame; the second service data frame is a service data frame sent by the first client device and received by the first transmission network device;

the determining module is further configured to determine, before the sending module sends the second transmission service frame to the second transmission network device on the second path, a forward delay of the second service data frame according to a time difference between the time when the second service data frame is received and a second reference time;

15. Transport network device according to claim 14,

the determining module is further configured to start a timer at a second reference time, stop the timer if the second service data frame is received, and determine a time of the timer as a forward delay of the second service data frame.

16. Transport network device according to claim 15,

the receiving module is further configured to receive a delay measurement trigger message.

17. Transport network device according to one of the claims 14,

the determining module is further configured to determine the second reference time before determining the forward delay of the second service data frame according to a time difference between the time when the second service data frame is received and the second reference time.

18. Transmission network device according to any of the claims 14, characterized in that the transmission network device further comprises: a processing module;

the processing module is configured to insert the forward delay of the second service data frame into the overhead of the second service data frame before the sending module sends the second transmission service frame to the second transmission network device on the second path, and carry the second service data frame in the load of the second transmission service frame.

19. A communication system, comprising: the remote radio unit and the baseband processing unit are characterized in that an optical transmission network is arranged between the remote radio unit and the baseband processing unit; the optical transmission network comprises a plurality of transmission network devices for realizing the communication connection between the radio remote unit and the baseband processing unit;

the transmission network device includes:

a receiving module, configured to receive a first transmission service frame sent by another transmission network device on a first path; the first transmission service frame comprises first service data information; the first path is a transmission path from the other transmission network device to the transmission network device; wherein the first service data information includes: a first service data frame and a forward delay of the first service data frame; the first service data frame is a service data frame which is received by the other transmission network device and sent by the second client device; the forward delay of the first service data frame is a time difference between the time when the other transmission network device receives the first service data frame and a first reference time;