CN102209280A - Uplink data processing method used in passive optical network and passive optical network - Google Patents
Uplink data processing method used in passive optical network and passive optical network Download PDFInfo
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Abstract
The invention discloses an uplink data processing method used in a passive optical network and a passive optical network. The method comprises the following steps: an optical line terminal distributes signal or a plurality of shared uplink bandwidths for a part of or the entire optical network unit and the optical network unit which has completed registration and activation sends uplink data in the signal or a plurality of shared uplink bandwidths. According to the invention, the communication efficiency between the optical line terminal and the optical network unit is improved.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to an uplink data processing method for a passive optical network and a passive optical network.
Background
A Passive Optical Network (PON) is a Passive Optical access technology using a point-to-multipoint topology, wherein a Gigabit-Capable Passive Optical Network (GPON) technology is an important technical branch in a Passive Optical Network family. The GPON system comprises: an Optical Line Terminal (OLT) on the office side, an Optical Network Unit (ONU) on the user side, and an Optical Distribution Network (ODN) generally adopt a point-to-multipoint Network structure.
In a GPON system, data transmission in a downlink direction (from an OLT to ONUs) adopts a broadcast mode, each ONU receives all frames, and acquires its own frame according to an ONU identifier (ONU-ID), a GPON Encapsulation Method (GEM for short) -Port identifier (Port ID), and an Allocation identifier (Allocation-ID). However, for data transmission in the upstream direction (from the ONUs to the OLT), since the transmission medium is shared, appropriate control processing is required to completely transmit the upstream data information of each ONU to the OLT.
The uplink frame adopts a Time Division Multiple Access (TDMA) technology, an uplink channel is divided into a plurality of Time slots by the TDMA technology, the ONU sends a report of sending uplink data to the OLT, and the OLT allocates an uplink bandwidth to the ONU according to the report of the ONU or through flow monitoring and controls the ONU to send data at a certain Time slot. The uplink bandwidth allocated by the OLT to the ONU is carried and transmitted by a bandwidth mapping bandwidth allocation structure (BWmapallocation structure) through a physical control Block (PCBd) of a downlink frame.
Therefore, it can be seen that an ONU needs to send data to an OLT after the OLT allocates an upstream bandwidth to the OLT, but in some cases, the ONU needs to send upstream data to the OLT without allocating an individual upstream bandwidth to the OLT.
In order to implement a part of management functions of the OLT on the ONU, the g.984.3 standard of ITU-T defines a PLOAM channel, and the GPON transmits a PLOAM message by using the PLOAM channel to implement management on a transmission convergence layer, where the management includes: ONU activation, ONU management control channel establishment, encryption configuration, key management and the like. The PLOAM message is transmitted in an uplink frame and a downlink frame, wherein each downlink frame comprises a PLOAM message, the OLT informs the ONU whether the PLOAM message can be sent in the uplink bandwidth or not through a bit 10 of a flag (Flags) field of a bandwidth allocation structure mapped by the bandwidth in the downlink frame, and when the value of the bit 10 is 1, the ONU sends the PLOAM message in the uplink bandwidth corresponding to the bandwidth allocation; if the value of bit 10 is 0, the ONU cannot transmit the PLOAM message within the upstream bandwidth corresponding to the bandwidth allocation.
If an urgent PLOAM message exists at the ONU and needs to be sent to the OLT, for example, when the ONU is normally powered off, the ONU needs to send a Dying _ Gasp message to the OLT to inform the OLT of normal power off, so that the OLT is prevented from sending unnecessary alarm reports. To complete the transmission of the Dying _ Gasp message, the ONU needs the OLT to allocate an upstream bandwidth to itself through an allocation structure, and the OLT sets bit 10 of a Flags field of the allocation structure to 1 to allow the ONU to transmit an upstream PLOAM message. The ONU can send a PLOAM message to the OLT only if the above conditions are met. If the OLT does not allocate an upstream bandwidth to the ONU which needs to send the Dying _ Gasp message, or if the OLT allocates an upstream bandwidth to the ONU through the allocation structure, the value of bit 10 in the Flags field of the allocation structure is 0, and the ONU cannot complete the sending of the emergency PLOAM message. In the current GPON system, if there is an emergency PLOAM message at an ONU and needs to be sent to the OLT, the ONU sends a report that there is an emergency PLOAM message at the ONU and needs to be transmitted to the OLT, the OLT allocates an upstream bandwidth for transmitting the emergency message to the ONU within 5 milliseconds (ms) after receiving the report, and the ONU receives the upstream bandwidth allocated by the OLT and sends the emergency PLOAM message. The disadvantages of this technique are: the method comprises the steps that an ONU sends a report that an urgent PLOAM message needs to be transmitted to the ONU, the report needs to be sent by the OLT to allocate an uplink bandwidth to the ONU, and if the OLT does not allocate the uplink bandwidth to the ONU, the ONU cannot send the report that the urgent PLOAM message needs to be transmitted to the ONU, so that the PLOAM message is not sent timely.
Another technique mentions that the ONU can inform the OLT that it has powered down itself by notifying part or all of bit position 1 of the indication field in the upstream frame, and also requires that the OLT has allocated upstream bandwidth to the ONU.
In order to solve the above problems, there is another technique that an OLT allocates individual upstream bandwidths for transmitting emergency PLOAM messages to all ONUs at a certain period, and the technique has the following disadvantages: if the period is short, when the PON system includes more ONUs, uplink bandwidth is wasted, and if the certain period is long, the ONU that needs to send the emergency PLOAM message cannot send the emergency PLOAM message to the OLT or cannot send the emergency PLOAM message to the OLT in time.
Disclosure of Invention
It is a primary object of the present invention to provide an upstream data processing scheme for a passive optical network that solves at least one of the above problems.
According to an aspect of the present invention, there is provided an upstream data processing method for a passive optical network, including the steps of: the optical line terminal distributes one or more shared uplink bandwidths to part or all of the optical network units; and the optical network unit which completes the registration activation sends the uplink data in the one or more shared uplink bandwidths.
According to another aspect of the present invention, there is also provided a passive optical network including an optical line terminal and an optical network unit, the optical line terminal including: the allocation module is used for allocating one or more shared uplink bandwidths to part or all of the optical network units; the optical network unit includes: and the sending module is used for sending the uplink data in the one or more shared uplink bandwidths.
By the invention, the OLT is adopted to allocate one or more shared uplink bandwidths to part or all of the ONUs; the ONU transmits the upstream data in the one or more shared upstream bandwidths, so that the problem that the ONU transmits the upstream data to the OLT under the condition that the ONU is not allocated with an individual bandwidth in the prior art is solved, and the communication efficiency between the OLT and the ONU in the PON system is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a flowchart of an uplink data processing method according to an embodiment of the present invention;
fig. 2 is a block diagram of a passive optical network according to an embodiment of the present invention;
fig. 3 is a block diagram of a preferred architecture of a passive optical network according to an embodiment of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The following examples are described by taking a GPON system as an example, and are applicable not only to XGPON1 and XGPON2 but also to TDMA PONs such as EPON and 10 GEPON.
Fig. 1 is a flowchart of an uplink data processing method according to an embodiment of the present invention, where the flowchart includes the following steps:
step S102, OLT distributes one or more shared upstream bandwidth to part or all ONU;
step S104, the ONU transmits the upstream data in one or more shared upstream bandwidths.
Through the steps, the problem caused by the fact that the OLT allocates the uplink bandwidth for each ONU independently in the conventional PON system is solved, and the communication efficiency between the OLT and the ONUs can be improved by allocating a shared uplink bandwidth for part or all of the ONUs.
Preferably, in step S104, the optical network unit that completes registration activation transmits uplink data in one or more shared uplink bandwidths.
Preferably, if the ONU has obtained an individual upstream bandwidth allocated to it by the OLT (hereinafter referred to as an upstream bandwidth for short, and an individual upstream bandwidth is an upstream bandwidth allocated by the OLT to a single optical network unit for transmitting upstream data), then the ONU can transmit upstream data in the individual upstream bandwidth, avoiding occupying the shared upstream bandwidth. Otherwise, the ONU transmits the uplink data in the shared uplink bandwidth. For example, an ONU transmits upstream data in one or more shared upstream bandwidths, without including an individual upstream bandwidth allocated to the ONU by the OLT in a downstream frame that includes the one or more shared upstream bandwidths. The ONU judges whether the shared uplink bandwidth is sent to the ONU after receiving the shared uplink bandwidth, if the ONU judges that the shared uplink bandwidth is sent to the ONU and does not contain the uplink bandwidth allocated to the ONU by the OLT in a downlink frame containing the shared uplink bandwidth, at the moment, if an emergency message exists at the ONU and needs to be sent to the OLT, the ONU sends uplink data (such as the emergency message, data or indication related to the emergency message) in the shared uplink bandwidth, or the ONU sends the uplink data (such as the emergency message, data or indication related to the emergency message) in the shared uplink bandwidth after waiting for a random delay. It should be noted that, after waiting for the random delay, the ONU transmits the upstream data in the shared upstream bandwidth, so that the probability of data collision can be reduced.
Preferably, the OLT may allocate an individual upstream bandwidth to the optical network unit that receives the shared upstream bandwidth but does not obtain bandwidth allocation, may also allocate an upstream bandwidth to all the optical network units in an operating state, or may directly allocate an upstream bandwidth to all the optical network units.
Preferably, the OLT detects a signal in one or more shared upstream bandwidths allocated to the ONUs, attempts to resolve upstream data in the one or more shared upstream bandwidths allocated to the ONUs, and if the upstream data cannot be resolved correctly, the OLT allocates the upstream bandwidth or continues to allocate the one or more shared upstream bandwidths; and under the condition of correct analysis, the OLT acquires the uplink data sent by the ONU.
In the case of an incorrect resolution, the OLT may allocate upstream bandwidth to ONUs that have not obtained upstream bandwidth allocation within a downstream frame that contains one or more shared upstream bandwidths. Or, the OLT may also allocate an upstream bandwidth to the ONU that transmits the upstream data after acquiring the upstream data. Then, the ONU that has obtained the upstream bandwidth allocation transmits upstream data in the upstream bandwidth allocated to it.
Preferably, the OLT may also allocate a plurality of different or the same shared upstream bandwidths, in which case the shared upstream bandwidth used is selected by the ONU and the upstream data is transmitted in the shared upstream bandwidth selected by the ONU. The same or different shared uplink bandwidths are determined according to the allocation identifiers in the allocation structure corresponding to the shared uplink bandwidths. In a case that the OLT allocates a plurality of different shared upstream bandwidths, the OLT may group the ONUs and allocate different shared upstream bandwidths to different groups, and the ONUs determine the shared upstream bandwidth allocated to themselves according to allocation information (for example, an allocation identifier Alloc _ ID in an allocation structure, or a value of a part or all of bits of a reserved field in an allocation structure corresponding to the shared upstream bandwidth) corresponding to the shared upstream bandwidth, and transmit upstream data in the shared upstream bandwidth allocated to themselves. For example, the OLT allocates a shared upstream bandwidth 1 to a part of the ONUs, allocates a shared upstream bandwidth 2 to another part of the ONUs, and so on, and the ONUs determine whether the shared upstream bandwidth is allocated to themselves according to an allocation identifier in an allocation structure corresponding to the shared upstream bandwidth. It should be noted that different or the same shared upstream bandwidth may also be allocated to ONUs in the same group.
Preferably, the OLT may attempt to resolve the upstream data if it detects that an ONU is emitting light or transmitting data in one or more shared upstream bandwidths. The OLT allocates one or more shared upstream bandwidths to part or all of the ONUs according to a preset period or under the condition of receiving a command (for example, a command from a network management system) for indicating allocation of the shared upstream bandwidth or under the condition of detecting that the optical network sends upstream data (or emits light).
After the ONU transmits upstream data in one or more shared upstream bandwidths, the ONU continues to respond to the shared upstream bandwidth allocated by the OLT or no longer responds to the shared upstream bandwidth allocated by the OLT. If the ONU continuously responds to the shared uplink bandwidth allocated by the OLT, the ONU can identify that the ONU already sends uplink data in an uplink frame; or, the OLT stores the corresponding relation between the identification of the ONU and the uplink data sent by the ONU. This is explained below: after the ONU transmits upstream data (e.g., an emergency message or data or indication related to the emergency message) within the shared upstream bandwidth, the ONU no longer responds to the shared upstream bandwidth transmitted by the OLT; or after the ONU sends the uplink data in the shared uplink bandwidth, the ONU continuously responds to the shared uplink bandwidth sent by the OLT, and if the ONU receives the shared uplink bandwidth, the ONU sends the uplink data in the shared uplink bandwidth, and the ONU identifies that the ONU has sent the uplink data in an uplink frame; or after the ONU sends the upstream data in the shared upstream bandwidth, the OLT stores the corresponding relation between the ONU identification of the ONU and the content sent by the ONU, the ONU continuously responds to the shared upstream bandwidth sent by the OLT, if the ONU receives the shared upstream bandwidth, the ONU sends the upstream data in the shared upstream bandwidth, and the OLT stores the corresponding relation between the ONU identification of the ONU and the content sent by the ONU.
Preferably, the shared uplink bandwidth may be a shared uplink bandwidth named sequence number Request (SN _ Request).
The ONU in the above embodiment may be an ONU in a working state; the upstream data may be an urgent message (e.g., a Dying _ Gasp message) and/or information corresponding to the urgent message (i.e., the urgent message and/or data or indication related to the urgent message). The ONU may send the emergency message and/or information corresponding to the emergency message by at least one of: an indication field of an upstream frame, a management message (e.g., a physical layer operation management maintenance message), an ONU management control interface message, a data frame (e.g., a passive optical network encapsulation method GEM frame).
Fig. 2 is a block diagram of a passive optical network according to an embodiment of the present invention, where the passive optical network includes an optical line terminal and an optical network unit, where the optical line terminal includes: an allocating module 22, configured to allocate one or more shared upstream bandwidths to part or all of the optical network units; the optical network unit includes: a sending module 24, configured to send the upstream data in one or more shared upstream bandwidths.
Preferably, the optical network unit may be an optical network unit that has completed registration activation.
Fig. 3 is a block diagram of a preferred structure of a passive optical network according to an embodiment of the present invention, where the optical line terminal further includes: a detection module 30 for detecting a signal in the allocated one or more bandwidths; the parsing module 32 is connected to the detecting module 30, and is configured to, if the detecting module 30 detects a signal, attempt to parse the uplink data in one or more shared uplink bandwidths, and if the parsing is correct, obtain the uplink data sent by the onu. The allocating module 22 allocates the upstream bandwidth or continues to allocate one or more shared upstream bandwidths in case the parsing module 32 cannot parse the upstream data correctly.
The following preferred examples one to three are described taking the emergency message as an example.
Preferred embodiment 1
In this example, the ONU sending the emergency message to the OLT includes the steps of:
step 1, an OLT allocates a shared uplink bandwidth named as Ungent _ Report _ Request to all ONUs in a working state in a certain period, wherein the shared uplink bandwidth is allocated to the ONUs by the OLT through a bandwidth allocation structure mapped by bandwidth in a downlink frame, and Alloc-ID of the allocation structure is 111111111110; the value of bit 10 of the Flags field of the allocation structure is 1, and the ONU is informed to send PLOAM information in the uplink bandwidth; the value of the start time (StartTime) of the allocation structure is xx, and the value of the stop time (StopTime) of the allocation structure is xx +12, indicating that the ONU transmits an upstream PLOAM (PLOAMu, PLOAM upstream) message at the xx th byte of the upstream frame and stops transmitting at xx +12 bytes.
And 2, after receiving the shared uplink bandwidth, the ONU analyzes that the value of the Alloc-ID of the uplink bandwidth is 111111111110, and then the ONU judges that the bandwidth allocation is the shared uplink bandwidth. And if the ONU needs to send the Dying _ Gasp message to the OLT and does not contain the individual upstream bandwidth which is allocated by the OLT to the ONU needing to send the Dying _ Gasp message in the downstream frame containing the shared upstream bandwidth, the ONU sends the PLOAM message named as the Dying _ Gasp or emits light in the shared upstream bandwidth.
Step 3, after the OLT receives the uplink data in the shared uplink bandwidth, if the OLT can correctly analyze the uplink data, the OLT obtains a PLOAM message which is named as dyeing _ Gasp and is sent by the ONU; if the OLT can not correctly analyze the upstream data, the OLT judges that an ONU sends a dyeing _ Gasp message in the shared upstream bandwidth through the content output to the media access control chip by the signal detection device. The OLT respectively allocates the upstream bandwidth which can transmit the emergency message to all the ONUs in the working state which do not obtain the upstream bandwidth allocation in the BWmap of the downstream frame containing the shared upstream bandwidth.
And 4, after receiving the uplink bandwidth allocated to the ONU by the OLT, the ONU needing to send the Dying _ Gasp message sends the Dying _ Gasp message in the uplink bandwidth.
In a modified example of this example, the OLT may allocate a plurality of shared upstream bandwidths with the same Alloc-ID of the allocation structure to the ONU, and the ONU may select one shared upstream bandwidth from the plurality of shared upstream bandwidths to transmit the upstream data.
In this example, the ONU sends the content of the emergency message to the OLT through the PLOAM message, the ONU may also send the content of the emergency message through the ONU management control interface message, the ONU may also send the content of the emergency message through the GEM frame, or the ONU may also indicate the content and the type of the emergency message sent by the ONU through a part or all of bit positions 1 of the indication field of the upstream frame. When the ONU indicates the content and the type of the emergency message transmitted by the ONU at bit position 1 of part or all of the indication field of the upstream frame, bit 10 of a Flags field of the shared upstream bandwidth allocated to the ONU by the OLT has a value of 0, the StartTime value is xx, and the StopTime value is xx + y, where y is 2, or y is an arbitrary integer value equal to or greater than 0.
In this example, StartTime refers to the time when the ONU starts to transmit the PLOAM message, and for a next-generation PON system (XG-PON system) based on the GPON technology, StartTime refers to the time when the ONU completes transmitting the PLOAM message, and for the XG-PON system, step 1 in this example is modified as follows: an OLT allocates a shared uplink bandwidth named as Ungent _ Report _ Request to all ONUs in a working state in a certain period, wherein the shared uplink bandwidth is allocated to the ONUs by the OLT through a bandwidth allocation structure mapped by bandwidth in a downlink frame, and Alloc-ID of the allocation structure is 111111111110; the value of the bit corresponding to the PLOAM message in the Flags field of the distribution structure is 1, and the ONU is informed to send the PLOAM message in the uplink bandwidth; the value of StartTime of the allocation structure is xx, and the value of Grant Size (Grant Size) of the allocation structure is 0 (or the minimum Grant Size of the uplink bandwidth corresponding to the allocation structure allocated to the ONU by the OLT, or another integer value greater than zero), indicating that the ONU completes transmission of the PLOAM message in the xx byte of the uplink frame. The other steps are the same as steps 2 to 4. The content is that the ONU sends an emergency message to the OLT through a PLOAM message, the ONU may also send the content of the emergency message through an ONU management control interface message, or the ONU may also indicate the content and the type of the emergency message sent by the ONU through a part or all of bit positions 1 of an indication field of an uplink frame.
In this example, the emergency message sent by the ONU may be a Dying _ Gasp message, or may be another emergency message.
In step 1 of this example, the OLT allocates a shared upstream bandwidth to all ONUs in a working state at a certain period, or the OLT may allocate one or more shared upstream bandwidths to all ONUs in the working state under the command of the network management system, or the OLT may allocate one or more shared upstream bandwidths to all ONUs at a certain period or under the command of the network management system.
In step 3 in this example, the OLT allocates, to all ONUs in the working state that do not obtain uplink bandwidth allocation in the downlink frame including the shared uplink bandwidth, uplink bandwidths that can transmit the emergency PLOAM message, respectively, and the OLT may also allocate, to all ONUs or all ONUs in the working state, uplink bandwidths that can transmit the emergency message.
In step 1 of this example, the value of Alloc-ID in the allocation structure corresponding to the shared uplink bandwidth is 111111111110, and the ONU determines that the allocation structure is the shared uplink bandwidth allocated to the ONU by the OLT according to the fact that the value of Alloc-ID in the allocation structure is 111111111110. In a modified example of this example, the OLT may also set bit0 of the Flags field to 1 (or set bit1 of the Flags field to bit 6 to bit 1) in the allocation structure corresponding to the shared upstream bandwidth, and notify the ONU that the allocation structure allocates the shared upstream bandwidth to the ONU for the OLT. After receiving the bandwidth allocation, the ONU determines that the allocation structure is the shared uplink bandwidth allocated to the ONU by the OLT, with the value of bit0 in the Flags field in the allocation structure of the shared uplink bandwidth being 1. If the present example is applied to other GPON technology-based next-generation PONs, the OLT may also notify the ONU of the shared upstream bandwidth allocated to the ONU by the allocation structure through a part or all of bits of the reserved domain in the allocation structure corresponding to the shared upstream bandwidth, for example, the OLT notifies the ONU of the shared upstream bandwidth allocated to the ONU by the reserved domain at position 1 of bit0, the OLT notifies the allocation structure of the shared upstream bandwidth allocated to the ONU by the OLT, and the OLT writes 0 in bit0 of the reserved domain, and notifies the ONU of the allocation structure of other bandwidths allocated to the ONU by the OLT.
In this example, after the ONU meeting a certain condition sends the emergency message or the data or the indication related to the emergency message within the shared upstream bandwidth, the ONU does not respond to the shared upstream bandwidth which is continuously sent by the OLT. In a modified example of this example, after sending the emergency message or the data or the indication related to the emergency message within the shared upstream bandwidth, the ONU meeting a certain condition may also be adopted to respond to the shared upstream bandwidth that the OLT continues to send, that is, if the ONU receives the shared upstream bandwidth, and the ONU needs to send the emergency message to the OLT, and when the downstream frame containing the shared upstream bandwidth does not contain the upstream bandwidth that the OLT allocates to the ONU that needs to send the emergency message, the ONU sends the emergency message or the data or the indication related to the emergency message within the shared upstream bandwidth, and the ONU may identify that the ONU has sent the emergency message or the data or the indication related to the emergency message in an indication field or a reserved field in the upstream frame; in a modified example of this example, after the ONU meeting a certain condition sends the emergency message or the data or the instruction related to the emergency message in the shared upstream bandwidth, the OLT stores the correspondence between the ONU identifier of the ONU and the content sent by the ONU, the ONU responds to the shared upstream bandwidth continuously sent by the OLT, if the ONU receives the shared upstream bandwidth and the ONU needs to send the emergency message to the OLT, and when the downstream frame containing the shared upstream bandwidth does not contain the upstream bandwidth allocated by the OLT to the ONU needing to send the emergency message, the ONU sends the emergency message or the data or the instruction related to the emergency message in the shared upstream bandwidth, and the OLT stores the correspondence between the ONU identifier and the content sent by the ONU.
In this example, when the OLT receives the emergency message or the data or the indication related to the emergency message sent by the ONU within the shared upstream bandwidth, and the OLT can correctly parse the content sent by the ONU within the shared upstream bandwidth, the OLT does not allocate the upstream bandwidth to the ONU any more, in a modified example of this example, the following scheme may also be adopted: the OLT receives an emergency message or data or instruction related to the emergency message sent by the ONU in the shared upstream bandwidth, and when the OLT can correctly analyze the content sent by the ONU in the shared upstream bandwidth, the OLT allocates an allocation structure capable of transmitting the emergency message or the data or instruction related to the emergency message to the ONU, and the ONU sends the emergency message or the data or instruction related to the emergency message in the upstream bandwidth corresponding to the allocation structure allocated to the ONU by the OLT, and identifies that the ONU has sent the upstream data in an upstream frame containing the upstream data.
In this example, the emergency message or the data related to the emergency message or the content of the indication sent by the ONU to the OLT in the shared upstream bandwidth is plaintext, the ONU may encrypt the emergency message or the data related to the emergency message or the content of the indication and then send the encrypted emergency message or the data related to the emergency message or the content of the indication to the OLT in the shared upstream bandwidth, or the ONU may perform integrity check calculation on the emergency message or the data related to the emergency message or the content of the indication to obtain data for verifying the integrity of the content, and send the data and the content to the OLT together in the shared upstream bandwidth.
Preferred embodiment two
In this example, the ONU sending the emergency message to the OLT includes the steps of:
step 21, the OLT allocates a shared upstream bandwidth named as unload _ Report _ Request to the ONU in the operating state with the ONU _ ID being odd number in a certain period, and allocates another shared upstream bandwidth named as unload _ Report _ Request to the ONU in the operating state with the ONU _ ID being even number in a certain period, where the shared upstream bandwidth is allocated to the ONU by the OLT through a bandwidth allocation structure mapped by bandwidth in a downstream frame, and the Alloc-ID of the allocation structure allocated to the ONU with the ONU _ ID being odd number is 111111111110; the Alloc-ID of the allocation structure allocated to the ONU with the even ONU _ ID is 111111111100; the value of bit 10 of the flag field of the allocation structure is 1, and the ONU is informed to send PLOAM information in the uplink bandwidth; the value of StartTime of the allocation structure is xx, and the value of StopTime of the allocation structure is xx +12, which indicates that the ONU transmits an upstream PLOAM (PLOAMu, PLOAM upstream) message at the xx th byte of the upstream frame and stops transmitting at xx +12 bytes.
Step 22, after receiving the shared uplink bandwidth, the ONU analyzes that the value of Alloc-ID of the uplink bandwidth is 111111111110 or 111111111100, and then the ONU determines that the bandwidth allocation is the shared uplink bandwidth. And the ONU with the odd ONU _ ID receives the shared uplink bandwidth with the Alloc-ID value of 111111111110, and considers that the shared uplink bandwidth is allocated to the ONU, and the ONU with the even ONU _ ID receives the shared uplink bandwidth with the Alloc-ID value of 111111111100, and considers that the shared uplink bandwidth is allocated to the ONU. If the ONU judges that the shared uplink bandwidth is allocated to the ONU, and if the ONU needs to send a Dying _ Gasp message to the OLT, and the uplink bandwidth allocated to the ONU needing to send the Dying _ Gasp message by the OLT is not contained in a downlink frame containing the shared uplink bandwidth, the ONU sends a PLOAM message named as Dying _ Gasp or emits light in the shared uplink bandwidth after waiting for a random delay time.
Step 23, after the OLT receives the upstream data in the shared upstream bandwidth, if the OLT can correctly analyze the upstream data, the OLT obtains a PLOAM message named Dying _ Gasp sent by the ONU; if the OLT cannot correctly analyze the uplink data, the OLT judges that an ONU sends a Dying _ Gasp message in the shared uplink bandwidth through the content output to the media access control chip by the signal detection device, or the OLT judges that an ONU sends a Dying _ Gasp message after receiving the uplink data in the shared uplink bandwidth, and the OLT continues to send the shared uplink bandwidth to the ONUs with the ONU-ID being odd number and the ONU-ID being even number respectively.
And 24, the OLT and the ONU repeat the steps until the OLT receives and can correctly analyze the Dying _ Gasp message sent by the ONU.
In this example, the OLT may send a plurality of shared upstream bandwidths of ONUs whose ONU _ IDs are odd or even, respectively, with the same value of Alloc-ID.
In this example, the ONU sends the content of the emergency message to the OLT through the PLOAM message, the ONU may also send the content of the emergency message through the ONU management control interface message, or the ONU may also indicate the content and the type of the emergency message sent by the ONU through a part or all of bit positions 1 of the indication field of the upstream frame. When the ONU indicates the content and the type of the emergency message transmitted by the ONU at bit position 1 of part or all of the indication field of the upstream frame, bit 10 of the Flags field of the shared upstream bandwidth allocated to the ONU by the OLT has a value of 0, the StartTime value is xx, and the StopTime value is xx + y, where y is 2, or y is an arbitrary integer value equal to or greater than 0.
In this example, StartTime refers to the time when the ONU starts to transmit the PLOAM message, and for a next-generation PON system based on the GPON technology (i.e., an XG-PON system), StartTime refers to the time when the ONU completes transmitting the PLOAM message, and for the XG-PON system, step 21 in this example is modified as follows: the value of the bit corresponding to the PLOAM message in the Flags field of the distribution structure is 1, and the ONU is informed to send the PLOAM message in the uplink bandwidth; the value of StartTime of the allocation structure is xx, and the value of Grant Size (Grant Size) of the allocation structure is 0 (or the minimum Grant Size of the uplink bandwidth corresponding to the allocation structure allocated to the ONU by the OLT, or another integer value greater than zero), indicating that the ONU completes transmission of the PLOAM message in the xx byte of the uplink frame. The other steps are the same as steps 22 to 24. The content is that the ONU sends an emergency message to the OLT through a PLOAM message, the ONU may also send the content of the emergency message through an ONU management control interface message, or the ONU may also indicate the content and the type of the emergency message sent by the ONU by referring to a part or all of bit positions 1 of an indication field of an uplink frame. In the case that the ONU indicates the content and the type of the emergency message sent by the ONU through bit position 1 in part or all of the indication field of the upstream frame, the bit value corresponding to the PLOAM message in the Flags field of the allocation structure is 0.
In this example, the emergency message sent by the ONU may be a Dying _ Gasp message, or may be another emergency message.
In step 21 of this example, the OLT allocates shared upstream bandwidths to the ONUs with odd ONU-IDs and the ONUs with even ONU-IDs at a certain period, or the OLT may allocate the shared upstream bandwidths to the ONUs under the command of the network management system, or the OLT may allocate the shared upstream bandwidths to the ONUs at a certain period or under the command of the gateway system. In this example, the OLT allocates shared upstream bandwidths to ONUs whose ONU-IDs are odd numbers and ONUs whose ONU-IDs are even numbers at a certain period, and in a modified example of this example, the OLT may allocate shared upstream bandwidths to ONUs whose ONU-IDs have a value less than or equal to a constant C and ONUs whose ONU-IDs have a value greater than the constant C at a certain period, or the OLT and the ONUs may agree to use another method, and the OLT allocates shared upstream bandwidths to the ONUs in batches. In this example, the OLT allocates the shared upstream bandwidth to two groups of ONUs, or the OLT may allocate the upstream bandwidth to multiple groups of ONUs.
In step 21 of this example, the value of Alloc-ID in the allocation structure corresponding to the shared upstream bandwidth is 111111111110 or 111111111100, and the ONU determines that the allocation structure is the shared upstream bandwidth allocated to the ONU by the OLT according to the value of Alloc-ID in the allocation structure. In a modified example of this example, the OLT may set bit0 of the Flags field in the allocation structure corresponding to the shared upstream bandwidth to 1 (or set bit 2 of the Flags field to bit 6 to be bit 1), notify part of the ONUs that the allocation structure allocates the shared upstream bandwidth to part of the ONUs for the OLT, and notify another part of the ONUs that the allocation structure allocates the shared upstream bandwidth to another part of the ONUs for the OLT by setting bit1 of the Flags field in the allocation structure corresponding to the shared upstream bandwidth to 1 (or setting bit 2 of the Flags field to bit 6 to be bit 1). After receiving the bandwidth allocation, the ONU determines that the allocation structure is the shared uplink bandwidth allocated to the ONU by the OLT, with the value of bit0 or bit1 in the Flags field in the allocation structure of the shared uplink bandwidth being 1. If this example is applied to other GPON technology-based next-generation PONs, the OLT may also notify the ONU of the shared upstream bandwidth allocated to the ONU by the allocation structure through a part or all of the bits of the reserved domain in the allocation structure corresponding to the shared upstream bandwidth, for example, the OLT notifies the ONU of the bit0 position 1 of the reserved domain, notifies the allocation structure of the shared upstream bandwidth allocated to a part of ONUs by the OLT, and the OLT notifies another part of ONUs of the bit1 position 1 of the reserved domain, and notifies the allocation structure of the shared upstream bandwidth allocated to another part of ONUs by the OLT. After receiving the bandwidth allocation, the ONU determines that the allocation structure is the shared upstream bandwidth allocated to the ONU by the OLT, where the value of bit0 or bit1 in the reserved field in the allocation structure of the shared upstream bandwidth is 1.
In this example, the OLT receives the emergency message or the data or the indication related to the emergency message sent by the ONU within the shared upstream bandwidth, and when the OLT can correctly parse the content sent by the ONU within the shared upstream bandwidth, the OLT does not allocate the upstream bandwidth to the ONU any more. The following scheme can also be adopted in a modified example of the present example: when the OLT receives the emergency message or the data or the instruction related to the emergency message sent by the ONU in the shared upstream bandwidth and the OLT can correctly analyze the content sent by the ONU in the shared upstream bandwidth, the OLT allocates an allocation structure capable of transmitting the emergency message or the data or the instruction related to the emergency message to the ONU, and the ONU sends the emergency message or the data or the instruction related to the emergency message in the upstream bandwidth corresponding to the allocation structure allocated to the ONU by the OLT.
In this embodiment, the emergency message or the data related to the emergency message or the content of the indication sent by the ONU to the OLT in the shared upstream bandwidth is plaintext, the ONU may encrypt the emergency message or the data related to the emergency message or the content of the indication and then send the encrypted emergency message or the data related to the emergency message or the content of the indication to the OLT in the shared upstream bandwidth, or the ONU may perform integrity check calculation on the emergency message or the data related to the emergency message or the content of the indication to obtain data for verifying the integrity of the content, and send the data and the content together to the OLT in the shared upstream bandwidth.
In step 23 of this embodiment, the OLT continues to send shared upstream bandwidths to ONUs whose ONU-IDs are odd and even, respectively; in step 24, the OLT and the ONU repeat the above steps until the OLT receives and can correctly analyze the Dying _ Gasp message sent by the ONU, and the following scheme may also be adopted in the modified example of this example: the OLT respectively allocates the upstream bandwidth capable of transmitting the emergency message to all the ONUs in the working state which do not acquire the upstream bandwidth allocation in the BWmap of the downstream frame containing the shared upstream bandwidth, and the ONU which needs to send the Dying _ Gasp message sends the Dying _ Gasp message in the upstream bandwidth after receiving the upstream bandwidth allocated to the ONU by the OLT.
Preferred embodiment III
The OLT and the ONU adopt the following main steps to finish the ONU sending the emergency message to the OLT:
step 31, the OLT sends a shared upstream bandwidth named as a serial number Request (SN _ Request), where the shared upstream bandwidth is allocated to the ONU by the OLT through a bandwidth allocation structure mapped by bandwidth in a downstream frame, and an Alloc-ID of the allocation structure is 0 xFE; the value of bit 10 of the Flags field of the allocation structure is 1, and the ONU is informed to send PLOAM information in the uplink bandwidth; the value of StartTime in the allocation structure is xx, and the value of StopTime in the allocation structure is xx +12, which indicates that the ONU transmits an upstream PLOAM (PLOAMu, PLOAM upstream) message at the xx th byte of the upstream frame and stops transmitting at xx +12 bytes.
In step 32, after receiving the shared uplink bandwidth, the ONU analyzes the value of the Alloc-ID of the uplink bandwidth, and then the ONU determines that the bandwidth allocation is the shared uplink bandwidth according to the value of the Alloc-ID (for example, the value is 0 xFE). And if the ONU needs to send the Dying _ Gasp message to the OLT and does not contain the upstream bandwidth which is allocated to the ONU needing to send the Dying _ Gasp message by the OLT in the downstream frame containing the shared upstream bandwidth, the ONU sends a PLOAM message named as the Dying _ Gasp in the shared upstream bandwidth.
Step 33, after the OLT receives the upstream data in the shared upstream bandwidth, if the OLT can correctly analyze the upstream data, the OLT obtains a PLOAM message which is sent by the ONU and named as Dying _ Gasp or serial number information sent by the unregistered and activated ONU; if the OLT cannot correctly analyze the upstream data, the OLT respectively allocates the upstream bandwidths capable of transmitting the emergency messages to all the ONUs in the working state which do not obtain the upstream bandwidth allocation in the BWmap of the downstream frame containing the shared upstream bandwidth.
Step 34, after receiving the uplink bandwidth allocated to itself by the OLT, the ONU that needs to send the Dying _ Gasp message sends the Dying _ Gasp message within the uplink bandwidth.
In this example, the ONU sends the content of the emergency message to the OLT through the PLOAM message, the ONU may also send the content of the emergency message through the ONU management control interface message, the ONU may also send the content of the emergency message through the GEM frame, or the ONU may also indicate the content and the type of the emergency message sent by the ONU through a part or all of bit positions 1 of the indication field of the upstream frame. When the ONU indicates the content and the type of the emergency message transmitted by the ONU at bit position 1 of part or all of the indication field of the upstream frame, bit 10 of the Flags field of the shared upstream bandwidth allocated to the ONU by the OLT has a value of 0, the StartTime value is xx, and the StopTime value is xx + y, where y is 2, or y is an arbitrary integer value equal to or greater than 0.
In this example, StartTime refers to the time when the ONU starts to transmit the PLOAM message, and for a next-generation PON system (i.e., an XG-PON system) based on the GPON technology, StartTime refers to the time when the ONU completes transmitting the PLOAM message, and for the XG-PON system, step 31 in this embodiment is modified as follows: the OLT sends a shared uplink bandwidth named as a serial number Request (SN _ Request), wherein the shared uplink bandwidth is allocated to the ONU by the OLT through a bandwidth allocation structure mapped by bandwidth in a downlink frame, and the Alloc-ID of the allocation structure is 0 xFE; the value of the bit corresponding to the PLOAM message in the Flags field of the distribution structure is 1, and the ONU is informed to send the PLOAM message in the uplink bandwidth; the value of StartTime of the allocation structure is xx, and the value of Grant Size (Grant Size) of the allocation structure is 0 (or the minimum Grant Size of the uplink bandwidth corresponding to the allocation structure allocated to the ONU by the OLT, or another integer value greater than zero), indicating that the ONU completes transmission of the PLOAM message in the xx byte of the uplink frame. The other steps are the same as steps 32 to 34. The content is that the ONU sends an emergency message to the OLT through a PLOAM message, the ONU may also send the content of the emergency message through an ONU management control interface message, or the ONU may also indicate the content and the type of the emergency message sent by the ONU through a part or all of bit positions 1 of an indication field of an uplink frame.
In this example, the emergency message sent by the ONU may be a Dying _ Gasp message, or may be another emergency message.
In step 33 of this example, the OLT allocates the upstream bandwidths capable of transmitting the emergency PLOAM message to all the ONUs in the operating state that do not obtain the upstream bandwidth allocation in the downstream frame including the shared upstream bandwidth, respectively, or the OLT may allocate the upstream bandwidths capable of transmitting the emergency message to all the ONUs or all the ONUs in the operating state.
In this example, after the ONU meeting a certain condition sends the emergency message or data or an indication related to the emergency message within the shared upstream bandwidth, the ONU no longer responds to the shared upstream bandwidth that the OLT continues to send; in a modified example of this example, after sending the emergency message or the data or the indication related to the emergency message in the shared upstream bandwidth, the ONU meeting a certain condition may also be adopted to respond to the shared upstream bandwidth that the OLT continues to send, that is, if the ONU receives the shared upstream bandwidth, and the ONU needs to send the emergency message to the OLT, and when the downstream frame containing the shared upstream bandwidth does not contain the upstream bandwidth that the OLT allocates to the ONU that needs to send the emergency message, the ONU sends the emergency message or the data or the indication related to the emergency message in the shared upstream bandwidth, and an indication field in the upstream frame of the ONU identifies that the ONU has sent the emergency message or the data or the indication related to the emergency message; in another modified example of this example, after the ONU meeting a certain condition sends the emergency message or the data or the instruction related to the emergency message in the shared upstream bandwidth, the OLT stores the correspondence between the ONU identifier of the ONU and the content sent by the ONU, the ONU responds to the shared upstream bandwidth continuously sent by the OLT, if the ONU receives the shared upstream bandwidth and the ONU needs to send the emergency message to the OLT, and when the downstream frame containing the shared upstream bandwidth does not contain the upstream bandwidth allocated by the OLT to the ONU that needs to send the emergency message, the ONU sends the emergency message or the data or the instruction related to the emergency message in the shared upstream bandwidth, and the OLT stores the correspondence between the ONU identifier of the ONU and the content sent by the ONU.
In this example, when the OLT receives the emergency message or the data or the indication related to the emergency message sent by the ONU within the shared upstream bandwidth, and the OLT can correctly parse the content sent by the ONU within the shared upstream bandwidth, the OLT does not allocate the upstream bandwidth to the ONU any more. The following scheme can also be adopted in a modified example of the present example: the OLT receives an emergency message or data or instruction related to the emergency message sent by the ONU in the shared upstream bandwidth, and when the OLT can correctly analyze the content sent by the ONU in the shared upstream bandwidth, the OLT allocates an allocation structure capable of transmitting the emergency message or the data or instruction related to the emergency message to the ONU, and the ONU sends the emergency message or the data or instruction related to the emergency message in the upstream bandwidth corresponding to the allocation structure allocated to the ONU by the OLT.
In this embodiment, the emergency message or the data related to the emergency message or the content of the indication sent by the ONU to the OLT in the shared upstream bandwidth is plaintext, the ONU may encrypt the emergency message or the data related to the emergency message or the content of the indication and then send the encrypted emergency message or the data related to the emergency message or the content of the indication to the OLT in the shared upstream bandwidth, or the ONU may perform integrity check calculation on the emergency message or the data related to the emergency message or the content of the indication to obtain data for verifying the integrity of the content, and send the data and the content together to the OLT in the shared upstream bandwidth.
In summary, according to the embodiments of the present invention, the ONU may send the emergency message to the OLT when the OLT does not allocate the uplink bandwidth to itself, or may notify the OLT that there is an emergency message to be sent, so as to shorten the waiting time for sending the emergency message at the ONU, and improve the communication efficiency between the OLT and the ONU in the PON system.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (15)
1. An uplink data processing method for a passive optical network, comprising the steps of:
the optical line terminal distributes one or more shared uplink bandwidths to part or all of the optical network units;
and the optical network unit which completes the registration activation sends the uplink data in the one or more shared uplink bandwidths.
2. The method of claim 1, further comprising:
the optical line terminal detects a signal in the one or more shared upstream bandwidths;
the optical line terminal tries to analyze the uplink data in the one or more shared uplink bandwidths, and allocates the uplink bandwidths or continues to allocate one or more shared uplink bandwidths under the condition that the uplink data cannot be analyzed correctly, wherein the uplink bandwidths are individual uplink bandwidths which are allocated by the optical line terminal for a single optical network unit and are used for sending the uplink data; and under the condition of correct analysis, the optical line terminal acquires the uplink data sent by the optical network unit.
3. The method of claim 2, wherein the allocating upstream bandwidth by the olt comprises:
and the optical line terminal allocates the uplink bandwidth for the optical network units which receive the one or more shared uplink bandwidths and do not obtain the uplink bandwidth allocation, all the optical network units in the running state or all the optical network units.
4. The method according to claim 2, wherein after the optical line terminal obtains the upstream data, the method further comprises:
the optical line terminal allocates an uplink bandwidth for the optical network unit which sends the uplink data;
and the optical network unit which acquires the uplink bandwidth allocation sends the uplink data in the uplink bandwidth allocated to the optical network unit, and identifies that the optical network unit has sent the uplink data in an uplink frame containing the uplink data.
5. The method of claim 1, wherein the sending the upstream data in the one or more shared upstream bandwidths by the ONU comprises:
and after waiting for the random delay, the optical network unit sends the uplink data in the one or more shared uplink bandwidths.
6. The method of claim 1,
the optical network unit sends the uplink data in the uplink bandwidth under the condition that the optical line terminal is used for independently allocating the uplink bandwidth; or,
and the optical network unit transmits the uplink data in the one or more shared uplink bandwidths.
7. The method according to claim 6, wherein the ONU transmits the upstream data in the one or more shared upstream bandwidths if the OLT does not individually allocate an upstream bandwidth to the ONU.
8. The method of claim 1, wherein the optical line terminal allocates a plurality of different or the same shared upstream bandwidths; and the optical network unit selects the used shared uplink bandwidth and transmits the uplink data in the selected shared uplink bandwidth.
9. The method according to claim 1, wherein the olt groups some or all of the onus and allocates different shared upstream bandwidths to different groups; and the optical network unit determines the shared uplink bandwidth allocated to the optical network unit according to the allocation information corresponding to the shared uplink bandwidth, and transmits the uplink data in the shared uplink bandwidth allocated to the optical network unit.
10. The method of claim 1, wherein the optical line terminal allocating the one or more shared upstream bandwidths to the part or all of the optical network units comprises:
and the optical line terminal allocates the one or more shared uplink bandwidths to part or all of the optical network units according to a preset period, under the condition of receiving a command for indicating allocation of the shared uplink bandwidth or under the condition of detecting that the optical network units send uplink data.
11. The method of claim 1, wherein after the ONU transmits the upstream data in the one or more shared upstream bandwidths, the method further comprises:
the optical network unit continuously responds to the shared uplink bandwidth distributed by the optical line terminal or does not respond to the shared uplink bandwidth distributed by the optical line terminal any more;
if the optical network unit continues to respond to the shared uplink bandwidth allocated by the optical line terminal, the optical network unit identifies that the optical network unit has sent the uplink data in an uplink frame; or, the OLT stores a correspondence between the identifier of the optical network unit and the uplink data sent by the optical network unit.
12. The method according to any one of claims 1 to 11, wherein the uplink data is an emergency message and/or information corresponding to the emergency message.
13. The method according to claim 12, wherein the onu transmits the emergency message and/or the information corresponding to the emergency message by at least one of: indication field of uplink frame, management message, optical network unit management control interface message, data frame.
14. A passive optical network comprises an optical line terminal and an optical network unit, and is characterized in that the optical network unit is an optical network unit which completes registration and activation;
the optical line terminal includes: the allocation module is used for allocating one or more shared uplink bandwidths to part or all of the optical network units;
the optical network unit includes: and the sending module is used for sending the uplink data in the one or more shared uplink bandwidths.
15. The passive optical network of claim 14, wherein the optical line terminal further comprises: a detection module, configured to detect a signal in the one or more bandwidths, and an analysis module, configured to attempt to analyze uplink data in the one or more shared uplink bandwidths when the detection module detects the signal, and obtain the uplink data sent by the optical network unit when the uplink data is correctly analyzed;
the allocation module allocates an uplink bandwidth or continues to allocate one or more shared uplink bandwidths under the condition that the analysis module cannot correctly analyze the uplink data, wherein the uplink bandwidth is an individual uplink bandwidth which is allocated by the optical line terminal for a single optical network unit and used for sending the uplink data.
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