CN117579963A

CN117579963A - Ranging method, ranging device and XPON system

Info

Publication number: CN117579963A
Application number: CN202311706105.4A
Authority: CN
Inventors: 王康; 许明; 谈杰
Original assignee: Kepu Semiconductor Tianjin Co ltd
Current assignee: Kepu Semiconductor Tianjin Co ltd
Priority date: 2023-12-13
Filing date: 2023-12-13
Publication date: 2024-02-20

Abstract

The utility model provides a ranging method, ranging device and XPON system, XPON system includes main OLT, standby OLT and at least one ONU, this application is before standby OLT sends the range request to target ONU, send the PLOAM message that carries the reference equivalent time delay to target ONU earlier, target ONU responds according to having the equivalent time delay before or not according to not having the equivalent time delay after receiving this message, afterwards can unify according to the reference equivalent time delay and respond, because standby OLT opens the range detection window according to the reference equivalent time delay, target ONU returns the range response according to the reference equivalent time delay, the uniformity at both ends has guaranteed that the range response must fall in the range detection window, consequently, can not lead to the re-ranging failure, and then can play effectual guard action.

Description

Ranging method, ranging device and XPON system

Technical Field

The present application relates to the field of communications technologies, and in particular, to a ranging method, a ranging device, and an XPON system.

Background

The XPON system is a passive optical network with high bandwidth, high efficiency, high optical splitting ratio and longer transmission distance performance, and includes an Optical Line Terminal (OLT), an optical network terminal (ONU) and an Optical Distribution Network (ODN). The transmission direction of data from the OLT to the ONUs is referred to as the downstream direction, while the transmission direction of the ONUs to the OLT is the upstream direction. Due to the increasing demands of users on OLT bandwidth, ensuring reliable operation of user traffic in XPON systems is a concern for both the equipment and operators.

In general, the XPON system may simultaneously set a main OLT and a standby OLT, where the main OLT is connected to the optical splitter through a main optical fiber, the standby OLT is connected to the optical splitter through a standby optical fiber, and each ONU is connected to the optical splitter. When an ONU is accessed to an XPON system, the ONU needs to go through an initial state (O1 state), a serial number state (O2-3 state) and a ranging state (O4 state), and then enters a normal running state (O5 state) so as to ensure stable running under a main channel of an OLT, and at the moment, uplink signals of the ONU can be received on both main and standby optical fibers. If the main channel fails, the ONU detects an LODS (downlink signal interruption), and enters a failure recovery waiting state (O6 state) from the O5 state, and the standby OLT opens the standby channel after detecting an upstream signal abnormality of the ONU. After entering the O6 state, if the ONU detects that the DSYNC downlink optical signals of the standby OLT are successfully synchronized under the condition that the timer is not overtime, the ONU can switch back to the O5 state from the O6 state, and if the timer is overtime, the ONU can switch back to the O1 state from the O6 state. The protection function can be achieved through the main and standby channel switching mechanism.

When the OLT switches back to the O5 state, the OLT uses the Registration ID (Registration ID) of the ONU response in the O5 state to re-range the ONU. However, because of numerous ONU manufacturers, some ONUs respond to the Registration ID (Registration ID) message in the O5 state, and some ONUs respond to the Registration ID (Registration ID) message according to that the ONUs have no equivalent delay, and some ONUs respond to the Registration ID (Registration ID) message according to that the ONUs have equivalent delay. Because of the existence of equivalent delay, when the Registration ID (Registration ID) message of the ONU response is sent out to the standby OLT, the message may not be received by the standby OLT in the ranging detection window of the standby OLT, so that ranging failure is caused, and the protection effect cannot be achieved.

Therefore, there is a technical problem that ranging failure easily occurs when the standby OLT re-ranges in the current active-standby channel switching scenario, and improvement is needed.

Disclosure of Invention

The embodiment of the application provides a ranging method, a ranging device, an XPON system, electronic equipment and a storage medium, which are used for solving the technical problem that ranging failure is easy to occur when a standby OLT (optical line terminal) re-ranging in a current standby channel switching scene.

In order to solve the technical problems, the embodiment of the application provides the following technical scheme:

the application provides a ranging method, which is applicable to an XPON system, wherein the XPON system comprises a main OLT, a standby OLT and at least one ONU, the method is applied to the standby OLT, and the method comprises the following steps:

after the main channel is switched to the standby channel, a PLOAM message is sent to the target ONU through the standby channel, wherein the PLOAM message carries reference equivalent time delay;

sending a ranging request to the target ONU through the standby channel, and opening a ranging detection window according to the reference equivalent time delay;

receiving a ranging response sent by the target ONU at the reference response time according to the reference equivalent time delay by the ranging detection window;

and obtaining a re-ranging result of the target ONU according to the ranging response.

In one embodiment, the step of opening a ranging detection window according to a reference equivalent delay comprises:

determining the starting time of a ranging detection window according to the reference equivalent time delay;

and opening the ranging detection window according to the starting moment.

In one embodiment, the step of sending a ranging request to the target ONU through the backup channel includes:

sending a request for acquiring registration ID information to the target ONU through the standby channel;

the step of receiving the ranging response sent by the target ONU at the reference response time according to the reference equivalent time delay and determining the reference response time by the ranging detection window comprises the following steps:

and receiving registration ID information returned by the target ONU through the ranging detection window.

In one embodiment, after the step of obtaining the re-ranging result of the target ONU according to the ranging response, the method further includes:

determining the target equivalent time delay of the target ONU according to the re-ranging result;

and transmitting the target equivalent time delay to the target ONU so that the target ONU determines a target response time according to the target equivalent time delay and transmits uplink data at the target response time.

The application also provides a ranging method, which is applicable to an XPON system, wherein the XPON system comprises a main OLT, a standby OLT and at least one ONU, the method is applied to a target ONU, and the method comprises the following steps:

after receiving PLOAM information sent by the standby OLT through the standby channel after the standby OLT switches to the standby channel, the PLOAM information carries reference equivalent time delay;

determining a reference response time according to the reference equivalent time delay;

receiving a ranging request sent by the standby OLT through the standby channel;

and sending a ranging response to the standby OLT at the reference response moment, so that the standby OLT receives the ranging response through the ranging detection window after opening the ranging detection window according to the reference equivalent time delay, and obtaining a re-ranging result according to the ranging response.

In one embodiment, the step of receiving the ranging request sent by the standby OLT through the standby channel includes:

receiving a request for acquiring registration ID information sent by the standby OLT through the standby channel;

the step of sending a ranging response to the standby OLT at the reference response time includes:

and transmitting registration ID information to the standby OLT at the reference response moment.

In one embodiment, after the step of sending a ranging response to the standby OLT at the reference response time, so that the standby OLT opens a ranging detection window according to the reference equivalent delay, receives the ranging response through the ranging detection window, and obtains a re-ranging result according to the ranging response, the method further includes:

receiving target equivalent time delay determined and transmitted by the standby OLT according to the re-ranging result;

and determining a target response time according to the target equivalent time delay, and transmitting uplink data at the target response time.

Meanwhile, the embodiment of the application also provides a ranging device, which is applicable to an XPON system, wherein the XPON system comprises a main OLT, a standby OLT and at least one ONU, the device is arranged on the standby OLT, and the device comprises:

the first sending module is used for sending PLOAM information to the target ONU through the standby channel after the main channel is switched to the standby channel, wherein the PLOAM information carries reference equivalent time delay;

the second sending module is used for sending a ranging request to the target ONU through the standby channel and opening a ranging detection window according to the reference equivalent time delay;

the first receiving module is used for receiving the ranging response sent by the target ONU at the reference response moment according to the reference equivalent time delay through the ranging detection window;

And the first obtaining module is used for obtaining a re-ranging result of the target ONU according to the ranging response.

The embodiment of the application also provides a ranging device, which is applicable to an XPON system, wherein the XPON system comprises a main OLT, a standby OLT and at least one ONU, the device is arranged on a target ONU, and the device comprises:

the second receiving module is used for receiving PLOAM information sent by the standby channel after the standby OLT switches to the standby channel, wherein the PLOAM information carries reference equivalent time delay;

the first determining module is used for determining a reference response time according to the reference equivalent time delay;

the third receiving module is used for receiving a ranging request sent by the standby OLT through the standby channel;

and the third sending module is used for sending a ranging response to the standby OLT at the reference response moment, so that the standby OLT receives the ranging response through the ranging detection window after opening the ranging detection window according to the reference equivalent time delay, and obtains a re-ranging result according to the ranging response.

The application also provides an XPON system, the XPON system includes main OLT, standby OLT and at least one ONU, wherein:

the standby OLT is used for sending PLOAM information to the target ONU through the standby channel after the main channel is switched to the standby channel, wherein the PLOAM information carries reference equivalent time delay;

The target ONU is used for determining a reference response time according to the reference equivalent time delay;

the standby OLT is also used for sending a ranging request to the target ONU through the standby channel and opening a ranging detection window according to the reference equivalent time delay;

the target ONU is further used for sending a ranging response to the standby OLT at the reference response moment;

the standby OLT is also used for receiving the ranging response through the ranging detection window and obtaining a re-ranging result of the target ONU according to the ranging response.

The application also provides an electronic device comprising a memory and a processor; the memory stores an application program, and the processor is configured to run the application program in the memory to perform the steps in the ranging method described in any one of the above.

Embodiments of the present application provide a computer readable storage medium storing a plurality of instructions adapted to be loaded by a processor to perform the steps in the ranging method described above.

The beneficial effects are that: the utility model provides a range finding method, range finding device, XPON system, electronic equipment and storage medium, this method is applicable to XPON system, XPON system includes main OLT, reserve OLT and at least one ONU, after main channel switches to reserve channel, reserve OLT sends PLOAM message to target ONU through reserve channel earlier, PLOAM message carries reference equivalent time delay, target ONU can confirm reference response time according to reference equivalent time delay, then reserve OLT sends the range finding request to target ONU through reserve channel, and open range finding detection window according to reference equivalent time delay, target ONU can send the range finding response to reserve OLT at reference response time, reserve OLT can receive the range finding response through range finding detection window at last, and obtain target ONU's re-ranging result according to the range finding response. Before the standby OLT sends a ranging request to the target ONU, the PLOAM message carrying the reference equivalent time delay is sent to the target ONU, after the target ONU receives the message, the target ONU responds according to the reference equivalent time delay no matter before the target ONU responds according to the equivalent time delay or the equivalent time delay, and then responds uniformly according to the reference equivalent time delay.

Drawings

Technical solutions and other advantageous effects of the present application will be made apparent from the following detailed description of specific embodiments of the present application with reference to the accompanying drawings.

Fig. 1 is a schematic diagram of a first scenario of a ranging method according to an embodiment of the present application.

Fig. 2 is a schematic diagram of a second scenario of a ranging method according to an embodiment of the present application.

Fig. 3 is a schematic flow chart of a ranging method according to an embodiment of the present application.

Fig. 4 is a schematic diagram of a process of re-ranging in an embodiment of the present application.

Fig. 5 is a schematic diagram of a second flow of a ranging method according to an embodiment of the present application.

Fig. 6 is a schematic diagram of a first structure of a ranging apparatus according to an embodiment of the present application.

Fig. 7 is a schematic diagram of a second structure of a ranging apparatus according to an embodiment of the present application.

Fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

Referring to fig. 1 and fig. 2, schematic diagrams of a first scenario and a second scenario of a ranging method application provided in this embodiment of the present application are shown, where the scenario includes an XPON system, and the XPON system may be an XG-PON system or an XGs-PON system, and the XPON system includes an OLT (Optical Line Terminal, an optical line terminal) and at least one ONU (Optical Network Unit, an optical network unit), where the OLT is a device connected to an optical fiber main line, and the ONU is a user side device, and is connected to a computer or a server, to provide a service of network communication, and the OLT and the ONU are connected to each other through an ODN (Optical Distribution Network, passive optical network) to perform communication. The OLT and each ONU transmit uplink and downlink by adopting different wavelengths during communication, and the downlink transmits data in a broadcasting mode, namely all data are broadcasted from the OLT to all the ONUs, each ONU selectively receives the data belonging to the ONU and discards other data; the uplink transmits data through the principle of TDMA (Time Division Multiple Access, time division multiplexing), that is, each ONU transmits data to the OLT only in the time slot that the OLT grants in advance, and the time slots of the ONUs do not overlap, so as to avoid uplink data collision.

In order to enable the system to continue to operate normally when the channel fails, a main OLT and a standby OLT are generally provided, the main OLT is connected to the optical splitter through a main optical fiber, the standby OLT is connected to the optical splitter through a standby optical fiber, a scenario in which the length of the main optical fiber is smaller than that of the standby optical fiber is shown in fig. 1, and a scenario in which the length of the standby optical fiber is smaller than that of the main optical fiber is shown in fig. 2. When an ONU accesses the XPON system, it needs to go through an initial state (O1 state), a serial number state (O2-3 state), a ranging state (O4 state), and then enter a normal running state (O5 state), where the main OLT communicates with each ONU through a main channel. If the main channel fails, the ONU detects an LODS (downlink signal interruption), and enters a fault recovery waiting state (O6 state) from the O5 state, and the standby OLT opens a standby channel after detecting an upstream signal abnormality of the ONU, and communicates with each ONU through the standby channel. After entering the O6 state, if the ONU detects that the DSYNC downlink optical signals of the standby OLT are successfully synchronized under the condition that the timer is not overtime, the ONU can switch back to the O5 state from the O6 state, and if the timer is overtime, the ONU can switch back to the O1 state from the O6 state. The protection function can be achieved through the main and standby channel switching mechanism.

As can be seen from fig. 1 and 2, the lengths of the main and the standby optical fibers are generally not equal, so that the ONU needs to be re-ranging after the main OLT is switched to the standby OLT. When the standby OLT switches from the O6 state to the O5 state, the standby OLT sends a ranging request to the ONU, then the ranging response returned by the ONU is used for re-ranging the ONU, and when the ranging is re-performed, the standby OLT needs an open ranging detection window to receive the ranging response, and the current open ranging detection window is calculated according to the equivalent time delay of 0. Before the ranging of each ONU by the main OLT is completed, the equivalent delay EQD is configured for each ONU, and because of a plurality of ONU manufacturers, different manufacturers have different configurations for the ONU, some ONU can send ranging response according to the equivalent delay of 0 in the re-ranging stage, and some ONU can send ranging response according to the previously configured equivalent delay EQD. In the latter case, the ranging response is likely to fall outside the ranging detection window and cannot be received by the OLT, thereby causing ranging failure and failing to play a protective role.

In the current XPON standard, it is not explicitly defined how the OLT controls the ONU to switch to the O4 state for re-ranging through PLOAM (Physical Layer Operations, administration and Maintenance, physical layer operation, administration and maintenance) messages. Based on the above, the application provides a ranging method, a ranging device, an XPON system, electronic equipment and a storage medium, which are used for solving the technical problem that ranging failure is easy to occur when the standby OLT re-ranging in the current standby channel switching scene. In the following embodiments, detailed description will be made from the viewpoints of the standby OLT side, the target ONU side, and the entire XPON system, respectively.

Referring to fig. 3, fig. 3 is a first flowchart of a ranging method according to an embodiment of the present application, where the method is applied to an OLT, and specifically includes:

s11: after the main channel is switched to the standby channel, the PLOAM message is sent to the target ONU through the standby channel, and the PLOAM message carries the reference equivalent time delay.

When the standby OLT detects that the received signal is abnormal, the main channel is switched to the standby channel, and the standby channel is communicated with each ONU. After the switching, the ranging is performed on each ONU, and the ONU needing ranging is referred to as a target ONU in the present application. After the backup channel is opened, the backup OLT will first send a PLOAM (Physical Layer Operations, administration and Maintenance, physical layer operation, management and maintenance) message to the target ONU through the backup channel, where the message carries a reference equivalent delay, and the reference equivalent delay is used to provide a reference for setting an equivalent delay value of the target ONU in the ranging stage. In this embodiment of the present application, the reference equivalent time delay is preferably 0, and the ranging detection window is calculated according to the reference equivalent time delay being 0. Of course, the application is not limited thereto, and the reference equivalent time delay may be other values, and a person skilled in the art may set a specific value of the reference equivalent time delay as required, so that the value may not only satisfy that the subsequent ranging response falls within the ranging detection window, but also will not cause other adverse effects.

S12: and sending a ranging request to the target ONU through the standby channel, and opening a ranging detection window according to the reference equivalent time delay.

After the message carrying the reference equivalent time delay is sent, the standby OLT sends a ranging request to the target ONU, and when the ranging request is sent, the standby OLT calculates what time needs to open the ranging detection window according to the reference equivalent time delay and opens the ranging detection window when the time arrives so as to receive the ranging response sent by the target ONU.

In one embodiment, in the re-ranging stage, the Registration ID (Registration ID) of the target ONU response in the O5 state is used to re-range the target ONU, so the content of the sent ranging request is: request to obtain registration ID information of the target ONU. And subsequently, receiving a ranging response sent by the target ONU through a ranging detection window, wherein the ranging response carries information of the registration ID.

In one embodiment, the starting time of the ranging detection window is determined according to the reference equivalent time delay, and then the ranging detection window is opened according to the starting time. As shown in fig. 4, each downstream frame structure sent by the OLT includes a downstream physical synchronization block "PSBd" and a payload "PHY frame content". After the standby OLT opens the standby channel, a Ranging request is sent to the target ONU, and when the downlink frame is the Ranging request "Ranging Grant", the following fields are required: the configuration of "Alloc-ID", "StartTime" and "GrantSize", which is equal to ONU-ID, and "StartTime", which is the above-mentioned period of time after the target ONU responds waiting to reach its own slot start time, is equal to S, and the configuration of "GrantSize" is equal to 0. When the target ONU recognizes that the request carries the above, it can be determined that the request is a ranging request.

In fig. 4, the time periods that have elapsed from the ranging request to the ranging response when the target ONU replies with an equivalent delay of 0 are shown. T (T) _1577，i "means a period of time during which a ranging request is transmitted from the standby OLT to the target ONU, and an end time of the period of time is a start time" Start of DS PHY frame in ONU's view "at which the target ONU receives the downstream frame. "RspTime" refers to a response period of the target ONU to the ranging request, and the end time of this period is the start time "Start of the US PHY frame in ONU's view" at which an uplink frame (ranging response) can be transmitted. "StartTime" refers to a period of time that needs to be waited from a start time that can be transmitted to an actual transmission time (slot start time), and the data structure of the ranging response includes an uplink physical synchronization block "PSBu" and a physical layer operation and administration maintenance message "PLOAM", and at an end time of "StartTime", also the slot start time, the target ONU starts to transmit "PLOAM", "T" in the ranging response to the standby OLT _1270，i "refers to the period of time that the ranging response is transmitted to the standby OLT.

When the standby OLT receives the ranging response, it opens a ranging detection window "quinte window" to receive, and only the ranging response falling within the ranging detection window is received. The ranging response carries the registration ID information of the target ONU, and in fig. 4, the start time T1 and the end time T2 of the ranging detection window are represented by a time "Earliest expected Registration ID PLOAM" when the registration ID message is expected to be received earliest and a time "Latest expected Registration ID PLOAM" when the registration ID message is expected to be received latest, respectively.

As can be seen from the above, when the equivalent delay of the target ONU is 0, the ranging request needs to pass through "rspetime" and "StartTime" at the ONU side to start transmitting, and it is not significant to window in advance, so normally, the standby OLT calculates and sequentially delays "rspetime" from the time "Start of the DS PHY frame in OLT's view" when the upstream frame (ranging request) is transmitted _min Two time periods of "and" StartTime "and then taking the delayed time as the starting time of the ranging detection window, wherein" RspTime _min "means the minimum response time period of the target ONU, the duration of which is not greater than the" rsttime "time period on the side of the target ONU, and" StartTime "means the time period that the target ONU needs to wait from the start time that can be transmitted to the actual transmission time (slot start time), which is equal to the" StartTime "time period on the side of the target ONU. The end time of the ranging detection window needs to be calculated, and the time needs to be calculated on the premise that the equivalent time delay is 0, when the target ONU is the ONU farthest from the standby OLT, the ranging response returned by the target ONU can be received by the standby OLT.

In the embodiment of the present application, when the reference equivalent time delay T is 0, the start time T1 of the ranging detection window is equal to the end time T1 of the standby OLT side "StartTime", and when the reference equivalent time delay T is not 0, the start time T1 of the ranging detection window is equal to t1+t. After reaching the starting moment, the standby OLT opens a ranging detection window to prepare for receiving a ranging response sent by the target ONU.

S13: and receiving the ranging response sent by the target ONU at the reference response time according to the reference equivalent time delay through the ranging detection window.

After receiving the PLOAM message, the target ONU acquires the reference equivalent time delay carried by the message, at the moment, no matter what value the equivalent time delay of the target ONU is, the target ONU is reset to the reference equivalent time delay, and then calculates the reference response time according to the reference equivalent time delay, namely the time when the target ONU actually transmits the ranging response after reaching the time slot of the target ONU. At this time, if the reference equivalent time delay T is 0, the reference response time T3 is equal to the end time T2 of the target ONU side "StartTime" in fig. 4, and if the reference equivalent time delay T2 is not 0, the reference response time T3 is equal to t2+t. After reaching the reference response time, the target ONU sends a ranging response to the standby OLT, and the standby OLT receives the ranging response through an open ranging detection window.

As shown in fig. 4, when the standby OLT windows with an equivalent delay of 0 and the target ONU responds with an equivalent delay of 0, the ranging response will necessarily fall within the ranging detection window T1 to T2. Therefore, when the reference equivalent time delay is 0, the ranging response will necessarily fall within the ranging detection window as in the original case of fig. 4. When the reference equivalent time delay is not 0, the total time length of the ranging detection window is unchanged, but the starting time and the ending time are delayed by T, but the starting time of transmitting the ranging response is delayed by T, and the two ends are still consistent actually, so that the ranging response still falls in the ranging detection window.

S14: and obtaining a re-ranging result of the target ONU according to the ranging response.

After receiving the ranging response, the standby OLT can calculate and obtain a re-ranging result of the target ONU, thereby completing the re-ranging process.

In one embodiment, after obtaining the re-ranging result, further comprising: determining the target equivalent time delay of the target ONU according to the re-ranging result; and transmitting the target equivalent time delay to the target ONU so that the target ONU determines a target response time according to the target equivalent time delay and transmits uplink data at the target response time. After the re-ranging is completed, in order to make the uplink data sent by each ONU on the standby channel not collide, the standby OLT needs to recalculate the target equivalent delay of each ONU on the standby channel, and configure the target equivalent delay to each ONU, and each ONU calculates the starting time of itself for sending the uplink data next time, that is, the target response time, according to the target equivalent delay, and then sends the uplink data at the target response time. Through the flow, each ONU can normally operate on the standby channel, and plays a role in protection.

In the prior art, when the standby OLT opens the ranging detection window, the standby OLT opens the ranging detection window usually according to the equivalent time delay of 0, and some ONUs respond according to the equivalent time delay of not 0 when responding, and the inconsistent at the two ends can cause the responses of the ONUs to fall behind the ranging detection window, so that the responses cannot be received by the standby OLT, and the re-ranging failure is caused.

In the embodiment of the application, before the standby OLT sends the ranging request to the target ONU, the PLOAM message carrying the reference equivalent delay is sent to the target ONU, after the target ONU receives the message, the target ONU responds according to the reference equivalent delay no matter before responding according to the equivalent delay or not, and then responds uniformly according to the reference equivalent delay.

Referring to fig. 5, fig. 5 is a second flowchart of a ranging method according to an embodiment of the present application, where the method is applied to a target ONU, and specifically includes:

s21: and after the standby OLT is switched to the standby channel, the PLOAM message is sent through the standby channel, and the PLOAM message carries the reference equivalent time delay.

When the standby OLT detects that the received signal is abnormal, the main channel is switched to the standby channel, and the standby channel is communicated with each ONU. After the switching, the re-ranging is performed on each ONU, and the ONU requiring the re-ranging is referred to as a target ONU in the present application. After the backup channel is opened, the backup OLT will first send a PLOAM (Physical Layer Operations, administration and Maintenance, physical layer operation, management and maintenance) message to the target ONU through the backup channel, where the message carries a reference equivalent delay, and the target ONU receives the message through the backup channel, where the reference equivalent delay is used to provide a reference for setting an equivalent delay value of the target ONU in the ranging stage. In this embodiment of the present application, the reference equivalent time delay is preferably 0, and the ranging detection window is calculated according to the reference equivalent time delay being 0. Of course, the application is not limited thereto, and the reference equivalent time delay may be other values, and a person skilled in the art may set a specific value of the reference equivalent time delay as required, so that the value may not only satisfy that the subsequent ranging response falls within the ranging detection window, but also will not cause other adverse effects.

S22: and determining the reference response time according to the reference equivalent time delay.

After receiving the PLOAM message, the target ONU acquires the reference equivalent time delay carried by the message, at the moment, no matter what value the equivalent time delay of the target ONU is, the target ONU is reset to the reference equivalent time delay, and then calculates the reference response time according to the reference equivalent time delay, namely, the time when the target ONU starts to send the ranging response after reaching the time slot of the target ONU.

S23: and receiving a ranging request sent by the standby OLT through the standby channel.

After sending the message carrying the reference equivalent time delay, the standby OLT sends a ranging request to the target ONU, and the target ONU receives the request through the standby channel.

S24: and sending a ranging response to the standby OLT at the reference response moment, so that the standby OLT receives the ranging response through the ranging detection window after opening the ranging detection window according to the reference equivalent time delay, and obtaining a re-ranging result according to the ranging response.

When a ranging request is sent, the standby OLT calculates what time needs to open a ranging detection window according to the reference equivalent time delay, and opens the ranging detection window when the time arrives. After reaching the reference response time, the target ONU sends a ranging response to the standby OLT, and the standby OLT receives the ranging response through an open ranging detection window. After receiving the ranging response, the standby OLT can calculate and obtain a re-ranging result of the target ONU, thereby completing the re-ranging process.

In one embodiment, in the re-ranging stage, the Registration ID (Registration ID) of the target ONU response in the O5 state is used to re-range the target ONU, so the content of the sent ranging request is: request to obtain registration ID information of the target ONU. The ranging response sent by the target ONU to the standby OLT will carry the information of the registration ID.

In one embodiment, the standby OLT first determines the starting time of the ranging detection window according to the reference equivalent delay, and then opens the ranging detection window according to the starting time. This specific procedure is identical to the description of fig. 4 in the above embodiment, and will not be repeated here.

In one embodiment, after the step of obtaining the re-ranging result, further comprising: the method comprises the steps that a target equivalent time delay which is determined and sent by an standby OLT according to a re-ranging result is received; and determining a target response time according to the target equivalent time delay, and transmitting uplink data at the target response time. After the re-ranging is completed, in order to make the uplink data sent by each ONU on the standby channel not collide, the standby OLT needs to recalculate the target equivalent delay of each ONU under the standby channel, and configure the target equivalent delay to each ONU. And the target ONU calculates the starting time of transmitting the uplink data next time, namely the target response time according to the target equivalent time delay, and then transmits the uplink data at the target response time. Through the flow, each ONU can normally operate on the standby channel, and plays a role in protection.

The application also provides an XPON system, which is the XPON system in any embodiment, and can be an XG-PON system or an XGS-PON system. The system comprises a main OLT, a standby OLT and at least one ONU, wherein: the standby OLT is used for sending PLOAM information to the target ONU through the standby channel after the main channel is switched to the standby channel, wherein the PLOAM information carries reference equivalent time delay; the target ONU is used for determining a reference response time according to the reference equivalent time delay; the standby OLT is also used for sending a ranging request to the target ONU through the standby channel and opening a ranging detection window according to the reference equivalent time delay; the target ONU is also used for sending a ranging response to the standby OLT at the reference response moment; the standby OLT is also used for receiving the ranging response through the ranging detection window and obtaining a re-ranging result of the target ONU according to the ranging response.

In the XPON system provided by the embodiment of the application, the two ends of the standby OLT and the target ONU interact, before the standby OLT sends a ranging request to the target ONU, a PLOAM message carrying a reference equivalent delay is sent to the target ONU, after the target ONU receives the message, whether the target ONU responds according to the equivalent delay or the equivalent delay without the reference equivalent delay, the standby OLT opens a ranging detection window according to the reference equivalent delay, the target ONU returns a ranging response according to the reference equivalent delay, and the consistency of the two ends ensures that the ranging response can necessarily fall in the ranging detection window, so that re-ranging failure cannot be caused, and an effective protection effect can be achieved.

The present embodiment will be further described from the viewpoint of a ranging apparatus provided to an OLT on the basis of the method described in the above embodiment. Referring to fig. 6, the ranging apparatus may include:

a first sending module 10, configured to send a PLOAM message to a target ONU through a backup channel after the primary channel is switched to the backup channel, where the PLOAM message carries a reference equivalent delay;

a second sending module 20, configured to send a ranging request to the target ONU through the backup channel, and open a ranging detection window according to a reference equivalent time delay;

A first receiving module 30, configured to receive, through the ranging detection window, a ranging response sent by the target ONU at a reference response time according to the reference equivalent delay;

a first obtaining module 40, configured to obtain a re-ranging result of the target ONU according to the ranging response.

In one embodiment, the second transmitting module 20 includes:

the first determining submodule is used for determining the starting moment of the ranging detection window according to the reference equivalent time delay;

and the first opening submodule is used for opening the ranging detection window according to the starting moment.

In one embodiment, the second sending module 20 is configured to send, to the target ONU through the backup channel, a request for obtaining registration ID information; the first receiving module 30 is configured to receive, through the ranging detection window, registration ID information returned by the target ONU.

In one embodiment, the ranging apparatus further comprises:

the second determining module is used for determining the target equivalent time delay of the target ONU according to the re-ranging result;

and the fourth sending module is used for sending the target equivalent time delay to the target ONU so that the target ONU can determine a target response time according to the target equivalent time delay and send uplink data at the target response time.

Compared with the prior art, the ranging device provided by the application is characterized in that before the standby OLT sends a ranging request to the target ONU, PLOAM information carrying reference equivalent time delay is sent to the target ONU, after the information is received by the target ONU, whether the target ONU responds according to the equivalent time delay or the equivalent time delay without the equivalent time delay, the target ONU responds uniformly according to the reference equivalent time delay, the ranging detection window is opened according to the reference equivalent time delay by the standby OLT, the target ONU returns the ranging response according to the reference equivalent time delay, the consistency of the two ends ensures that the ranging response can necessarily fall in the ranging detection window, so that re-ranging failure can not be caused, and an effective protection effect can be achieved.

The embodiment also provides a ranging device, which is arranged on the target ONU. Referring to fig. 7, the ranging apparatus may include:

a second receiving module 50, configured to receive a PLOAM message sent by a standby OLT through a standby channel after a main channel is switched to the standby channel, where the PLOAM message carries a reference equivalent delay;

a first determining module 60, configured to determine a reference response time according to the reference equivalent delay;

a third receiving module 70, configured to receive a ranging request sent by the standby OLT through the standby channel;

And a third sending module 80, configured to send a ranging response to the standby OLT at the reference response moment, so that the standby OLT receives the ranging response through the ranging detection window after opening the ranging detection window according to the reference equivalent time delay, and obtains a re-ranging result according to the ranging response.

In one embodiment, the third receiving module 70 is configured to receive a request sent by the standby OLT through the standby channel to obtain the registration ID information; the third sending module 80 is configured to send registration ID information to the standby OLT at the reference response time.

In one embodiment, the ranging apparatus further comprises:

the fourth receiving module is used for receiving the target equivalent time delay determined and transmitted by the standby OLT according to the re-ranging result;

and the fifth sending module is used for determining a target response time according to the target equivalent time delay and sending uplink data at the target response time.

Accordingly, the embodiment of the present application further provides an electronic device, as shown in fig. 8, where the electronic device may include a Radio Frequency (RF) circuit 101, a memory 102 including one or more computer readable storage media, an input unit 103, a display unit 104, a sensor 105, an audio circuit 106, a WiFi module 107, a processor 108 including one or more processing cores, and a power supply 109. It will be appreciated by those skilled in the art that the electronic device structure shown in fig. 8 is not limiting of the electronic device and may include more or fewer components than shown, or may combine certain components, or a different arrangement of components. Wherein:

the radio frequency circuit 101 may be used for receiving and transmitting signals during the process of receiving and transmitting information or communication, in particular, after receiving downlink information of the base station, the downlink information is processed by one or more processors 108; in addition, data relating to uplink is transmitted to the base station. The memory 102 may be used to store software programs and modules that the processor 108 executes to perform various functional applications and ranging by running the software programs and modules stored in the memory 102. The input unit 103 may be used to receive entered numeric or character information and to generate keyboard, mouse, joystick, optical or trackball signal inputs related to customer settings and function control.

The display unit 104 may be used to display information entered by a client or provided to a client and various graphical client interfaces of a server, which may be composed of graphics, text, icons, video, and any combination thereof.

The electronic device may also include at least one sensor 105, such as a light sensor, a motion sensor, and other sensors. Audio circuitry 106 includes speakers that may provide an audio interface between the client and the electronic device.

WiFi belongs to a short-distance wireless transmission technology, and the electronic equipment can help clients to send and receive emails, browse webpages, follow-up streaming media and the like through the WiFi module 107, so that wireless broadband Internet follow-up is provided for the clients. Although fig. 8 shows the WiFi module 107, it is understood that it does not belong to the necessary constitution of the electronic device, and can be omitted entirely as required within a range that does not change the essence of the application.

The processor 108 is a control center of the electronic device that uses various interfaces and lines to connect the various parts of the overall handset, performing various functions of the electronic device and processing the data by running or executing software programs and/or modules stored in the memory 102, and invoking data stored in the memory 102, thereby performing overall monitoring of the handset.

The electronic device further comprises a power supply 109 (e.g. a battery) for powering the components, which may preferably be logically connected to the processor 108 via a power management system, whereby the functions of managing charging, discharging, and power consumption are performed by the power management system.

Although not shown, the electronic device may further include a camera, a bluetooth module, etc., which will not be described herein. Specifically, in this embodiment, the processor 108 in the server loads executable files corresponding to the processes of one or more application programs into the memory 102 according to the following instructions, and the processor 108 executes the application programs stored in the memory 102, so as to implement the following functions:

In one embodiment, the functions are implemented:

and opening the ranging detection window according to the starting moment.

In one embodiment, the functions are implemented:

Alternatively, the following functions are implemented:

In one embodiment, the functions are implemented:

According to the electronic equipment, before the standby OLT sends the ranging request to the target ONU, the PLOAM message carrying the reference equivalent time delay is sent to the target ONU, after the target ONU receives the message, the target ONU responds according to the equivalent time delay or according to the non-equivalent time delay, and then responds uniformly according to the reference equivalent time delay.

In the foregoing embodiments, the descriptions of the embodiments are focused on, and the portions of a certain embodiment that are not described in detail may be referred to the foregoing detailed description, which is not repeated herein.

Those of ordinary skill in the art will appreciate that all or a portion of the steps of the various methods of the above embodiments may be performed by instructions, or by instructions controlling associated hardware, which may be stored in a computer-readable storage medium and loaded and executed by a processor.

To this end, embodiments of the present application provide a computer readable storage medium having stored therein a plurality of instructions capable of being loaded by a processor to perform the following functions:

In one embodiment, the functions are implemented:

and opening the ranging detection window according to the starting moment.

In one embodiment, the functions are implemented:

Alternatively, the following functions are implemented:

In one embodiment, the functions are implemented:

According to the computer readable storage medium, before the standby OLT sends a ranging request to the target ONU, PLOAM information carrying reference equivalent time delay is sent to the target ONU, after the target ONU receives the information, whether the target ONU responds according to equivalent time delay or according to no equivalent time delay, the target ONU responds uniformly according to the reference equivalent time delay, the standby OLT opens a ranging detection window according to the reference equivalent time delay, the target ONU returns a ranging response according to the reference equivalent time delay, the consistency of the two ends ensures that the ranging response can necessarily fall in the ranging detection window, re-ranging failure cannot be caused, and an effective protection effect can be achieved.

The foregoing describes in detail a ranging method, apparatus, electronic device and computer readable storage medium provided in the embodiments of the present application, and specific examples are applied to illustrate principles and implementations of the present application, where the foregoing description of the embodiments is only for helping to understand the technical solutions and core ideas of the present application; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A ranging method, which is suitable for an XPON system, the XPON system including a main OLT, a standby OLT, and at least one ONU, the method being applied to the standby OLT, the method comprising:

2. The ranging method as claimed in claim 1, wherein the step of opening the ranging detection window according to the reference equivalent delay comprises:

and opening the ranging detection window according to the starting moment.

3. The ranging method of claim 1, wherein the step of transmitting a ranging request to the target ONU through the backup channel comprises:

4. The ranging method as defined in claim 1, further comprising, after the step of obtaining a re-ranging result of the target ONU according to the ranging response:

5. A ranging method, adapted for an XPON system, the XPON system including a main OLT, a standby OLT, and at least one ONU, the method being applied to a target ONU, the method comprising:

6. The ranging method as claimed in claim 5, wherein the step of receiving the ranging request transmitted by the standby OLT through the standby channel comprises:

7. The ranging method as claimed in claim 5, wherein the step of transmitting a ranging response to the standby OLT at the reference response time so that the standby OLT receives the ranging response through the ranging detection window after opening the ranging detection window according to the reference equivalent delay, and obtaining a re-ranging result according to the ranging response, further comprises:

8. A ranging apparatus, adapted for an XPON system, the XPON system comprising a main OLT, a standby OLT and at least one ONU, the apparatus being arranged in the standby OLT, the apparatus comprising:

9. A ranging apparatus, adapted for use in an XPON system, the XPON system comprising a main OLT, a standby OLT, and at least one ONU, the apparatus being configured to be located in a target ONU, the apparatus comprising:

10. An XPON system, comprising a main OLT, a standby OLT and at least one ONU, wherein: