CN110933532A - TDM-PON mobile forward optical network data transmission method and device based on frame preemption - Google Patents
TDM-PON mobile forward optical network data transmission method and device based on frame preemption Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
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Abstract
The invention discloses a TDM-PON mobile fronthaul optical network data transmission method and device based on frame preemption. The method is applied to an Optical Network Unit (ONU), and comprises the following steps: sending a first Ethernet frame to an Optical Line Terminal (OLT); receiving a second Ethernet frame sent by an optical network unit RU, wherein the second Ethernet frame reaches the ONU in the process of sending the current first Ethernet frame; detecting whether the priority of the second Ethernet frame is higher than the priority of the current first Ethernet frame; if yes, detecting whether the current first Ethernet frame meets an interruption condition; and if so, interrupting the current transmission of the first Ethernet frame and transmitting the second Ethernet frame to the OLT, thereby reducing the queuing delay of the delay sensitive service.
Description
Technical Field
The invention relates to the technical field of mobile communication networks, in particular to a TDM-PON mobile fronthaul optical network data transmission method and device based on frame preemption.
Background
Radio over Ethernet (RoE) is a method of encapsulating and framing wireless data by using Ethernet. An ethernet-based time division multiplexing-passive optical network (TDM-PON) adopts the RoE technology, combines the advantages of the ethernet and the passive optical network, is considered to be a feasible scheme for the networking of a fronthaul network, and is concerned by the academic and industrial fields. However, since the mobile fronthaul network has a very high delay requirement for data transmission, low delay regulation will be a key problem for the TDM-PON to carry the mobile fronthaul network.
The 5G has various kinds of services, different service characteristics, and different requirements for time delay. In three typical service scenarios defined by 5G at present, a high-reliability low-latency communication (urrllc) scenario has a very high requirement on latency, and latency experienced by latency-sensitive data in such a service scenario from a mobile terminal to a Central Unit (CU) needs to be within 0.5ms, which requires improvement of a service processing manner of an existing network, so that bandwidth and latency of a high-reliability service are predictable and guaranteed and cannot be impacted by other services. The TDM-PON supports uplink and downlink data transmission of multiple ONUs (optical network units) on one wavelength channel by using a time division multiplexing method, so that a data frame must be sent in a sending window allocated by the OLT, which may cause the data frame to experience a long queuing delay, including a delay when other ONUs send the data frame and a delay when the ONU where the data frame is located sends other frames, and thus cannot meet the delay requirement of a 5G bearer service.
Disclosure of Invention
In view of this, the present invention provides a TDM-PON mobile fronthaul optical network data transmission method and apparatus based on frame preemption, which can reduce queuing delay of delay sensitive services.
The TDM-PON mobile fronthaul optical network data transmission method based on frame preemption provided by the present invention based on the above object is applied to an optical network unit ONU, and the method includes:
sending a first Ethernet frame to an Optical Line Terminal (OLT);
receiving a second Ethernet frame sent by an optical network unit RU, wherein the second Ethernet frame reaches the ONU in the process of sending the current first Ethernet frame;
detecting whether the priority of the second Ethernet frame is higher than the priority of the current first Ethernet frame;
if yes, detecting whether the current first Ethernet frame meets an interruption condition;
and if so, interrupting the current sending of the first Ethernet frame and sending the second Ethernet frame to the OLT.
In some embodiments of the present invention, before the sending the first ethernet frame to the optical line termination OLT, the method further includes:
acquiring a first Ethernet frame sent by a remote unit RU in a first polling period, and caching the first Ethernet frame in a queue; the first Ethernet frame is a data frame obtained by encapsulating wireless data by RUs.
In some embodiments of the present invention, the sending the first ethernet frame to the optical line terminal OLT specifically includes:
in a second polling period, sequentially sending the first Ethernet frames in the queue to the OLT in a sending window distributed by the OLT according to the sequence of the priority from high to low; the second polling period is a next period of the first polling period.
In some embodiments of the present invention, the detecting whether the current first ethernet frame meets the interrupt condition specifically includes:
detecting whether the lengths of a sent part and a non-sent part of a current first Ethernet frame are not less than the minimum length of the Ethernet frame;
if yes, judging that the current first Ethernet frame meets the interrupt condition;
if not, judging that the current first Ethernet frame does not meet the interrupt condition.
In some embodiments of the present invention, the interrupting of the sending of the current first ethernet frame and sending the second ethernet frame to the OLT specifically includes:
interrupting transmission of a current first Ethernet frame;
processing a sent part and a non-sent part of a current first Ethernet frame;
sending the second Ethernet frame to an OLT;
and re-buffering the processed unsent part into the queue.
In some embodiments of the present invention, the processing the sent part and the unsent part of the current first ethernet frame specifically includes:
a 4-byte cyclic redundancy check is added at the end of the sent portion of the current first ethernet frame and an 8-byte header is added at the beginning of the unsent portion of the current first ethernet frame.
In some embodiments of the invention, the method further comprises:
and when detecting that the priority of the second Ethernet frame is not higher than that of the current first Ethernet frame or the current first Ethernet frame does not meet the interrupt condition, continuing to send the current first Ethernet frame.
In some embodiments of the invention, the method further comprises:
and after the second Ethernet frame is sent, continuing to send the first Ethernet frame in the queue in the sending window.
In some embodiments of the invention, the method further comprises:
if the first Ethernet frame in the queue is not sent in the sending window, continuing to send the first Ethernet frame in the queue in a third polling period; the third polling period is a next period of the second polling period.
Correspondingly, the invention also provides a TDM-PON mobile fronthaul optical network data transmission device based on frame preemption, comprising:
a sending module, configured to send a first ethernet frame to an optical line terminal OLT;
the receiving module is used for receiving a second Ethernet frame sent by an optical network unit RU, and the second Ethernet frame reaches the ONU in the sending process of the current first Ethernet frame;
the first detection module is used for detecting whether the priority of the second Ethernet frame is higher than that of the current first Ethernet frame;
the second detection module is used for detecting whether the current first Ethernet frame meets an interrupt condition when the priority of the second Ethernet frame is higher than that of the current first Ethernet frame; and the number of the first and second groups,
and the interruption module is used for interrupting the sending of the current first Ethernet frame and sending the second Ethernet frame to the OLT when the current first Ethernet frame meets the interruption condition.
As can be seen from the above description, according to the TDM-PON mobile fronthaul optical network data transmission method and apparatus based on frame preemption, when an ONU sends a first ethernet frame to an OLT, a second ethernet frame sent by an RU is received, and the second ethernet frame reaches the ONU in the process of sending the current first ethernet frame, and when it is detected that the priority of the second ethernet frame is higher than the priority of the current first ethernet frame and the current first ethernet frame meets an interruption condition, the sending of the current first ethernet frame is interrupted, and the second ethernet frame is sent to the OLT, so that the queuing delay of the delay-sensitive second ethernet frame is reduced, and data of the second ethernet frame can be processed as early as possible.
Drawings
Fig. 1 is a schematic flowchart of a TDM-PON mobile fronthaul optical network data transmission method based on frame preemption according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a frame preemption based TDM-PON mobile fronthaul optical network data transmission method according to an embodiment of the present invention;
fig. 3 is another schematic diagram of a TDM-PON mobile fronthaul optical network data transmission method based on frame preemption according to an embodiment of the present invention;
fig. 4 is another schematic flow chart of a TDM-PON mobile fronthaul optical network data transmission method based on frame preemption according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a TDM-PON mobile fronthaul optical network data transmission apparatus based on frame preemption according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
Referring to fig. 1, a schematic flow chart of a method for transmitting TDM-PON mobile fronthaul optical network data based on frame preemption provided in an embodiment of the present invention is shown, where the method is applied to an optical network unit ONU, and the method includes:
101. the first ethernet frame is sent towards the optical line termination OLT.
In the embodiment of the invention, the first Ethernet frame is an Ethernet frame sent by an RU to an ONU. Specifically, before step 101, that is, before the sending the first ethernet frame to the optical line terminal OLT, the method further includes: acquiring a first Ethernet frame sent by a remote unit RU in a first polling period, and caching the first Ethernet frame in a queue; the first Ethernet frame is a data frame obtained by encapsulating wireless data by RUs.
It should be noted that, one of the conventional forwarding standardized interfaces, cpri (common Public radio interface), transmits continuous time-domain in-phase quadrature signals (IQ) with fixed quantized sampling bits, which occupies a large amount of forwarding bandwidth and affects the flexible transmission of the forwarding network. Moreover, CPRI is used as a forwarding interface, all baseband processing functions are concentrated in BBU, and RRU is only responsible for basic rf (radio frequency) functions, and after sampling OFDM signals carrying control information such as synchronization signals, reference signals, control signaling, and key radio system information and user data by RRU, demodulation processing such as FFT must be performed at BBU to obtain user-based data. Since the basic Time unit of radio scheduling is TTI (transmission Time interval), complete channel estimation information within 1TTI is required for radio signal demodulation at the BBU, and therefore, the BBU must collect data of 1TTI and process the data. And after the functional division point of the eCPRI (enhanced CPRI) forward interface based on the actual load of the user is subjected to resource element demapping, the output signal flow is based on the user at this time, and the BBU (which should be called DU at this time) can be processed after not completely collecting data of 1 TTI. The embodiment of the invention adopts an eCPRI forwarding interface based on the NG-RAN background with flexible function segmentation. According to the priority of service data carried by the eCPRI message, the RU sends Ethernet frames with payloads of different priorities of the eCPRI message to corresponding priority queues in the ONU, wherein the Ethernet frame bearing the delay sensitive service has the highest priority.
Specifically, after the DU and the UE negotiate the radio time-frequency resource, the data of the mobile user is transmitted in TTI unit. The radio time-frequency resource is allocated on an RB basis, occupying 12 consecutive subcarriers in the frequency domain and 1 slot in the time domain. If the baseband processing function is considered as a functional chain, the functional chain includes two parts, namely an antenna stream processing function and a user stream processing function. The uplink direction of the antenna flow processing function sequentially includes serial-to-parallel conversion (or CPRI coding), Cyclic prefix removal (Cyclic prefix remove), FFT (fast fourier transform), and resource demapping (RE demapping). In the antenna stream part, different user signals use radio carriers of different frequencies for information transmission, and signals of all frequency components are mixed together in a time domain. The antenna stream processing function is responsible for demapping the user signals in the same time domain and different frequency domains, and distinguishing the signals of different users from each other in the frequency domain, that is, each RB corresponds to one user. And the RU encapsulates the data carried by the RB at the moment into the payload of the Ethernet frame and sends the Ethernet frame to the ONU. The transmission rate of an RU is related to the Optical Fronthaul Interface (OFI) rate. In this process, since the ONU is typically deployed on the RU side, the propagation delay between the RU and the ONU is negligible.
As shown in fig. 2, the RU acquires the eccri messages a1, a2, A3, a4, a5, A6, where a2 and a4 are high priority, a1 and A6 are medium priority, and A3 and a5 are low priority. The RU encapsulates the eCPRI message into ethernet frames B1, B2, B3, B4, B5, B6, and sends it to the ONU at rate R1.
And after the ONU receives the data of the first polling period, namely after the ONU receives the first Ethernet frame sent by the RU in the first polling period, the ONU starts to send the first Ethernet frame to the OLT. Specifically, the sending of the first ethernet frame to the optical line terminal OLT in step 101 includes: in a second polling period, sequentially sending the first Ethernet frames in the queue to the OLT in a sending window distributed by the OLT according to the sequence of the priority from high to low; the second polling period is a next period of the first polling period.
In the second polling period, the first ethernet frame acquired in the first polling period is sent to the OLT in the PON bandwidth capacity in the order of priority from high to low. As shown in fig. 2, the ONU receives the first ethernet frames B1, B2, and B3 in the first polling period, and from the second polling period, that is, from time t2, the ONU transmits the first ethernet frames B2, B1, and B3 to the OLT in the order of priority from high to low, and the transmission rate is R2.
102. And receiving a second Ethernet frame sent by the optical network unit RU, wherein the second Ethernet frame reaches the ONU in the process of sending the current first Ethernet frame.
In the embodiment of the present invention, when the ONU sends the first ethernet frame acquired in the first polling period to the OLT in the second polling period, the ONU receives an ethernet frame from the RU in the second polling period, that is, a second ethernet frame. In this process, it may happen that the second ethernet frame with higher priority arrives during the transmission of the first ethernet frame with lower priority, and it needs to be determined whether to execute the preemptive low-latency scheduling scheme.
As shown in fig. 2, when the ONU starts transmitting the first ethernet frames B2, B1, and B3 from time t2, the ONU simultaneously receives the second ethernet frames B4, B5, and B6 from time t 2. When the second ethernet frame B4 arrives at the ONU at time t3, the ONU is transmitting the first ethernet frame B1.
103. And detecting whether the priority of the second Ethernet frame is higher than that of the current first Ethernet frame, if so, executing step 104.
In the embodiment of the present invention, when determining whether to execute the preemptive low-latency scheduling scheme, the priorities of an arriving second ethernet frame and a currently sent first ethernet frame are determined, if the priority of the arriving second ethernet frame is higher than the priority of the currently sent first ethernet frame, step 104 is continuously performed, that is, whether to execute the preemptive low-latency scheduling scheme is continuously determined, and if the priority of the arriving second ethernet frame is lower than or equal to the priority of the currently sent first ethernet frame, the preemptive low-latency scheduling scheme is not executed, that is, the current first ethernet frame is continuously sent.
104. And detecting whether the current first Ethernet frame meets an interrupt condition, and if so, executing the step 105.
In the embodiment of the present invention, an interrupt condition is preset, where the interrupt condition may include that the lengths of both the sent portion and the unsent portion of the current first ethernet frame need to satisfy the minimum frame length of the ethernet frame. Specifically, the detecting whether the current first ethernet frame meets the interrupt condition in step 104 includes: detecting whether the lengths of a sent part and a non-sent part of a current first Ethernet frame are not less than the minimum length of the Ethernet frame; if yes, judging that the current first Ethernet frame meets the interrupt condition; if not, judging that the current first Ethernet frame does not meet the interrupt condition.
And if the current first Ethernet frame does not meet the interrupt condition, the preemptive low-delay scheduling scheme is not executed, the current first Ethernet frame is continuously sent, and if the current first Ethernet frame meets the interrupt condition, the preemptive low-delay scheduling scheme is executed. As shown in fig. 3, it is assumed that data traffic is divided into three priorities, High Priority (HP), Medium Priority (MP), and Low Priority (LP). The higher the delay requirement of the data service, the higher the priority. Ethernet frames with different priorities from RUs enter corresponding priority queues in the ONUs, and the transmission sequence of each polling period of the ONUs is transmitted in sequence according to the frame priority from high to low. And in the process of sending the Ethernet frame in the jth polling period, the Ethernet frame in the next polling period, namely the jth +1 th polling period, also enters each priority queue of the ONU according to the rule. When a lower priority frame of the jth polling period is being sent, a higher priority frame of the jth +1 th polling period reaches the ONU, and at this time, if it is determined that the lower priority frame satisfies the interruption condition, the high priority frame may execute a preemptive low-latency scheduling scheme. Therefore, the high-priority frame of the j +1 th polling cycle is sent in advance to the j polling cycle, and the queuing time delay is reduced, so that the data can be processed by the BBU as early as possible.
105. Interrupting the transmission of the current first ethernet frame and transmitting said second ethernet frame to the OLT.
In the embodiment of the invention, the preemptive low-delay scheduling scheme is used for robbing the high-priority frame and interrupting the transmission of the current lower-priority frame. Specifically, the interrupting of the transmission of the current first ethernet frame and the transmitting of the second ethernet frame to the OLT in step 105 includes: interrupting transmission of a current first Ethernet frame; processing a sent part and a non-sent part of a current first Ethernet frame; sending the second Ethernet frame to an OLT; and re-buffering the processed unsent part into the queue.
It should be noted that, after the currently transmitted first ethernet frame is interrupted, the first ethernet frame needs to be processed, so that the transmitted part and the untransmitted part of the first ethernet frame respectively form a complete frame. Specifically, the processing the sent part and the unsent part of the current first ethernet frame includes: a 4-byte cyclic redundancy check is added at the end of the sent portion of the current first ethernet frame and an 8-byte header is added at the beginning of the unsent portion of the current first ethernet frame.
As shown in fig. 2, at time t3, the second ethernet frame B4 arrives at the ONU during transmission of the first ethernet frame B1, and the second ethernet frame B4 has a higher priority than the first ethernet frame B1, at which time, if it is determined that the first ethernet frame B1 satisfies the interrupt condition, the transmission of the first ethernet frame B1 is interrupted, and an appropriate overhead, i.e., a 4-byte cyclic redundancy check, is added to the transmitted portion of the first ethernet frame B1, while an appropriate overhead, i.e., an 8-byte header, is added to the untransmitted portion of the first ethernet frame B1. Then, it starts sending a second ethernet frame B4 to the OLT.
Further, the method further comprises: and after the second Ethernet frame is sent, continuing to send the first Ethernet frame in the queue in the sending window.
It should be noted that the unsent part of the first ethernet frame may be buffered in the queue, so that the first ethernet frame in the queue continues to be sent in the order of priority from high to low after the transmission of the preempted second ethernet frame is completed. As shown in fig. 2, after the transmission of the second ethernet frame B4 is complete, the unsent portion of the first ethernet frame B1 continues to be transmitted.
It should be noted that the implementation of the preemptive low-latency scheduling scheme does not affect the length of the time slots of the transmission window assigned to the ONUs by the OLT, and should only transmit within the specified transmission window regardless of the order of data transmission by the ONUs. And if the first Ethernet frame in the queue is not sent in the sending window, waiting for the arrival of the next polling period. Specifically, the method further comprises: if the first Ethernet frame in the queue is not sent in the sending window, continuing to send the first Ethernet frame in the queue in a third polling period; the third polling period is a next period of the second polling period.
As shown in fig. 2, the length of the unsent portion of the first ethernet frame B1 exceeds the remaining length of the transmission window, the unsent portion of the first ethernet frame B1 is fragmented, and the fragmented portion is transmitted to the OLT at time t4, i.e., the third polling cycle.
Referring to fig. 4, it is another schematic flow chart of a TDM-PON mobile fronthaul optical network data transmission method based on frame preemption provided in the embodiment of the present invention, where the method includes:
401. the RU collects 1TTI of wireless data.
402. The RU encapsulates the wireless data into Ethernet frames and sends the Ethernet frames to the ONU.
403. The ONU receives an ethernet frame for a polling period.
404. And the ONU transmits the Ethernet frames in a transmission window distributed by the OLT according to the sequence from high priority to low priority.
405. And the ONU judges whether an Ethernet frame with higher priority arrives or not in the process of sending the current Ethernet frame, if so, the step 406 is executed, and if not, the step 409 is executed.
406. The ONU determines whether to send preemption, if so, performs step 407, and if not, performs step 409.
407. And the ONU processes the currently transmitted low-priority frame.
408. The ONU transmits the preempted high priority frame and performs step 410.
409. The ONU continues to send the current ethernet frame.
410. Whether the ONU has finished transmitting the wireless data of 1TTI is determined, and if yes, the ONU ends the method, and if no, step 411 is executed.
411. And the ONU judges whether the frame length of the next ethernet frame exceeds the sending window, if so, executes step 412, and if not, returns to step 404.
412. And the ONU transmits the next Ethernet frame after segmenting the frame.
413. The ONU waits for the start of the next polling period and returns to step 404.
It should be noted that while waiting for the next polling cycle, the ONU starts to transmit an ethernet frame.
The 5G has various kinds of services, different service characteristics, and different requirements for time delay. If the service data frames are not processed differently, the data of the delay sensitive service may not meet the delay requirement. The invention provides a TDM-PON mobile forward optical network data transmission method based on frame preemption, which is characterized in that a second Ethernet frame sent by an RU is received while a first Ethernet frame is sent to an OLT through an ONU, the second Ethernet frame reaches the ONU in the current sending process of the first Ethernet frame, when the second Ethernet frame is detected to have higher priority than the current priority of the first Ethernet frame and the current first Ethernet frame meets an interruption condition, the sending of the current first Ethernet frame is interrupted, and the second Ethernet frame is sent to the OLT, so that the queuing delay of a frame carrying time sensitive service data is reduced as much as possible under the condition that the delay requirement of non-delay sensitive service data is met.
Correspondingly, the invention also provides a TDM-PON mobile forwarding optical network data transmission device based on the frame preemption, which can realize all the processes of the TDM-PON mobile forwarding optical network data transmission method based on the frame preemption.
Referring to fig. 5, a schematic structural diagram of a TDM-PON mobile fronthaul optical network data transmission apparatus based on frame preemption provided in an embodiment of the present invention is shown, where the apparatus includes:
a sending module 1, configured to send a first ethernet frame to an optical line terminal OLT;
the receiving module 2 is configured to receive a second ethernet frame sent by the optical network unit RU, where the second ethernet frame reaches the ONU in the process of sending the current first ethernet frame;
a first detecting module 3, configured to detect whether the priority of the second ethernet frame is higher than the priority of the current first ethernet frame;
the second detection module 4 is configured to detect whether the current first ethernet frame meets an interrupt condition when the priority of the second ethernet frame is higher than the priority of the current first ethernet frame; and the number of the first and second groups,
and the interruption module 5 is configured to interrupt sending of the current first ethernet frame and send the second ethernet frame to the OLT when the current first ethernet frame meets an interruption condition.
The TDM-PON mobile forward optical network data transmission device based on frame preemption receives a second Ethernet frame sent by an RU while sending the first Ethernet frame to an OLT through an ONU, and the second Ethernet frame reaches the ONU in the sending process of the current first Ethernet frame.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
In addition, well known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown within the provided figures for simplicity of illustration and discussion, and so as not to obscure the invention. Furthermore, devices may be shown in block diagram form in order to avoid obscuring the invention, and also in view of the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the present invention is to be implemented (i.e., specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the invention, it should be apparent to one skilled in the art that the invention can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.
While the present invention has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic ram (dram)) may use the discussed embodiments.
The embodiments of the invention are intended to embrace all such alternatives, modifications and variances that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A TDM-PON mobile forwarding optical network data transmission method based on frame preemption is characterized in that the method is applied to an optical network unit ONU, and the method comprises the following steps:
sending a first Ethernet frame to an Optical Line Terminal (OLT);
receiving a second Ethernet frame sent by an optical network unit RU, wherein the second Ethernet frame reaches the ONU in the process of sending the current first Ethernet frame;
detecting whether the priority of the second Ethernet frame is higher than the priority of the current first Ethernet frame;
if yes, detecting whether the current first Ethernet frame meets an interruption condition;
and if so, interrupting the current sending of the first Ethernet frame and sending the second Ethernet frame to the OLT.
2. The method according to claim 1, wherein before the sending the first ethernet frame to the OLT, the method further comprises:
acquiring a first Ethernet frame sent by a remote unit RU in a first polling period, and caching the first Ethernet frame in a queue; the first Ethernet frame is a data frame obtained by encapsulating wireless data by RUs.
3. The method according to claim 2, wherein the sending a first ethernet frame to the OLT specifically includes:
in a second polling period, sequentially sending the first Ethernet frames in the queue to the OLT in a sending window distributed by the OLT according to the sequence of the priority from high to low; the second polling period is a next period of the first polling period.
4. The method for TDM-PON mobile fronthaul optical network data transmission based on frame preemption of claim 1, wherein the detecting whether the current first ethernet frame meets an interruption condition specifically comprises:
detecting whether the lengths of a sent part and a non-sent part of a current first Ethernet frame are not less than the minimum length of the Ethernet frame;
if yes, judging that the current first Ethernet frame meets the interrupt condition;
if not, judging that the current first Ethernet frame does not meet the interrupt condition.
5. The method according to claim 3, wherein the interrupting of the current sending of the first ethernet frame and sending the second ethernet frame to the OLT specifically comprises:
interrupting transmission of a current first Ethernet frame;
processing a sent part and a non-sent part of a current first Ethernet frame;
sending the second Ethernet frame to an OLT;
and re-buffering the processed unsent part into the queue.
6. The method according to claim 5, wherein the processing a transmitted part and an unsent part of a current first ethernet frame specifically includes:
a 4-byte cyclic redundancy check is added at the end of the sent portion of the current first ethernet frame and an 8-byte header is added at the beginning of the unsent portion of the current first ethernet frame.
7. The method for TDM-PON mobile fronthaul optical network data transmission based on frame preemption of claim 1, wherein the method further comprises:
and when detecting that the priority of the second Ethernet frame is not higher than that of the current first Ethernet frame or the current first Ethernet frame does not meet the interrupt condition, continuing to send the current first Ethernet frame.
8. The method for TDM-PON mobile fronthaul optical network data transmission based on frame preemption of claim 3, wherein the method further comprises:
and after the second Ethernet frame is sent, continuing to send the first Ethernet frame in the queue in the sending window.
9. The method for TDM-PON mobile fronthaul optical network data transmission based on frame preemption of claim 8, wherein the method further comprises:
if the first Ethernet frame in the queue is not sent in the sending window, continuing to send the first Ethernet frame in the queue in a third polling period; the third polling period is a next period of the second polling period.
10. A TDM-PON mobile forwarding optical network data transmission device based on frame preemption is characterized by comprising:
a sending module, configured to send a first ethernet frame to an optical line terminal OLT;
the receiving module is used for receiving a second Ethernet frame sent by an optical network unit RU, and the second Ethernet frame reaches the ONU in the sending process of the current first Ethernet frame;
the first detection module is used for detecting whether the priority of the second Ethernet frame is higher than that of the current first Ethernet frame;
the second detection module is used for detecting whether the current first Ethernet frame meets an interrupt condition when the priority of the second Ethernet frame is higher than that of the current first Ethernet frame; and the number of the first and second groups,
and the interruption module is used for interrupting the sending of the current first Ethernet frame and sending the second Ethernet frame to the OLT when the current first Ethernet frame meets the interruption condition.
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| CN201911018375.XA CN110933532A (en) | 2019-10-24 | 2019-10-24 | TDM-PON mobile forward optical network data transmission method and device based on frame preemption |
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