WO2018201698A1 - 无源光网络中传输汇聚层组帧的实现方法及系统 - Google Patents
无源光网络中传输汇聚层组帧的实现方法及系统 Download PDFInfo
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- WO2018201698A1 WO2018201698A1 PCT/CN2017/112051 CN2017112051W WO2018201698A1 WO 2018201698 A1 WO2018201698 A1 WO 2018201698A1 CN 2017112051 W CN2017112051 W CN 2017112051W WO 2018201698 A1 WO2018201698 A1 WO 2018201698A1
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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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- 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
- H04Q2011/0086—Network resource allocation, dimensioning or optimisation
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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
- H04Q2011/0088—Signalling aspects
Definitions
- the present invention relates to the field of passive optical networks, and in particular to a method and system for implementing transmission aggregation layer framing in a passive optical network.
- the PON system generally includes an OLT (Optical Line Terminal), an ODN (Optical Distribution Network), and an ONU (Optical Network Unit).
- OLT Optical Line Terminal
- ODN Optical Distribution Network
- ONU Optical Network Unit
- the OLT broadcasts data to all ONUs through the ODN.
- each ONU performs data transmission only in time slots authorized by the OLT.
- data services such as Ethernet frames
- other services such as OMCI management frames
- TC framing includes three. Part: GEM (GPON Encapsulation Mode) data frame, GEM idle frame, and TC overhead.
- TC framing In the relevant standards of the PON system (GPON standard ITU-T G.984.3, XGPON standard ITU-T G.987.3, NGPON2 standard and XGS-PON standard ITU-T G.989.3, hereinafter referred to as PON protocol), TC framing The structure is described in detail. At present, the problems in the circuit design of the TC framing that implements the PON protocol encapsulation are:
- the minimum can be 5 bytes, and the maximum is more than 38000 bytes, XG-PON The minimum can be 8 bytes, the maximum is more than 155520 bytes)); and the actual service data (such as Ethernet service) is suddenly variable, so for rate adaptation, a large data buffer is needed (at least Store 1/2 frame maximum length TC framing) to store bursty traffic data, but this will take up a large circuit area.
- the technical problem to be solved by the present invention is: how to dynamically control the insertion of data frame framing and idle frames when transmitting the convergence layer framing in the passive optical network, and ensure the constant line of the TC group frame. At the same time, the framing probability of the data frame is increased as much as possible, and the idle frame insertion is minimized, thereby improving the throughput and QOS of the entire PON system.
- the method for implementing the transmission convergence layer framing in the passive optical network includes the following steps:
- Step A When the GEM idle frame length + GEM data frame length ⁇ all GEM frame length + data frame framing threshold, and the data frame length of the participating TC group frame > 0, if the total length of the GEM frame - GEM idle frame length -GEM data frame length ⁇ GEM frame header length + data frame length of the TC group frame; the data frames participating in the TC group frame are fragmented to obtain the data frames participating in the fragmentation, and the data frames participating in the fragmentation are added to the GEM.
- the length of the data frame encapsulated into the GEM frame the total length of the GEM frame - the length of the GEM idle frame - the length of the GEM data frame - the length of the GEM frame header, and proceeds to step B;
- An implementation system for transmitting a convergence layer framing in a passive optical network that implements the foregoing method, including a data frame fragmentation unit and an idle frame insertion unit;
- the data frame fragmentation unit is configured to: when the GEM idle frame length + GEM data frame length ⁇ all GEM frame length + data frame framing threshold, and the data frame length of the TC group frame is > 0, if the total length of the GEM frame - GEM idle frame length - GEM data frame length ⁇ GEM frame header length + data frame length of the TC group frame; the data frames participating in the TC group frame are fragmented, and the data frames participating in the fragment are obtained, and the fragmentation is performed.
- the present invention reduces the large-capacity data frame buffer according to the self-developed calculation method, thereby significantly reducing the area of the design circuit.
- the present invention inserts a minimum length of idle frames as much as possible while ensuring a constant line rate, thereby improving the framing efficiency, thereby significantly improving the throughput and QOS of the entire PON system.
- the algorithm developed by the present invention is relatively simple, and can be applied to an FPGA (Field-Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit), which is suitable for any PON system, and is particularly suitable for Supporting multimode OLT or multimode PON systems in a single circuit (for example, supporting both GPON and XGPON) is well suited for generalization.
- FPGA Field-Programmable Gate Array
- ASIC Application Specific Integrated Circuit
- FIG. 1 is a flowchart of a method for implementing a convergence layer framing in a passive optical network according to an embodiment of the present invention
- FIG. 2 is a connection block diagram of an implementation system for transmitting convergence layer framing in a passive optical network according to an embodiment of the present invention.
- GPON Gigabit-capable passive optical networks
- GTC the transmission convergence layer in GPON
- XG-PON (10-Gigabit-capable passive optical networks), the transmission convergence layer in XG-PON is XGTC;
- NG-PON2 (40-Gigabit-capable passive optical networks), the transmission convergence layer in NG-PON2 is NG-PON2TC;
- XGS-PON whose transmission convergence layer is XGS-PON TC.
- an implementation method for transmitting a convergence layer framing in a passive optical network includes the following steps:
- S1 Set all GEM frame lengths of the TC group to 0. All GEM frame lengths include the read and unread GEM data frame length and the GEM idle frame length, and go to S2.
- the total length of the TC group frame is obtained.
- the total length of the GEM frame to be framed is obtained.
- the data overhead length includes the TC layer overhead and the FEC overhead, and goes to S3.
- the data frame of the TC group frame is divided into two parts: the data frame participating in the fragmentation and the data frame not participating in the fragmentation, and the data frame participating in the fragment is added to the GEM frame header, encapsulated into the GEM frame, and transferred to the S4. .
- the length of the data frame encapsulated into the GEM frame the total length of the GEM frame - the length of the GEM idle frame - the length of the GEM data frame - the length of the GEM frame header;
- Data frame length not participating in fragmentation data frame length of participating framing - (GEM frame total length - GEM idle frame length - GEM data frame length - GEM frame frame header length).
- S4 Encrypt the data frame encapsulated into the GEM frame in S3 according to the encryption algorithm specified by the PON protocol (for example, AES128), and go to S5.
- PON protocol for example, AES1228
- the idle frame in which the length of the idle frame inserted in S5 is smaller than the minimum length of the idle frame of the minimum length may be taken only by the length of the length of the idle frame inserted in the minimum length of the idle frame.
- S7 scramble the line data according to the scrambling algorithm specified by the PON protocol, scramble the line data, and go to S8.
- an implementation system for transmitting a convergence layer framing in a passive optical network includes a data frame fragmentation unit, a data frame encryption unit, an idle frame insertion unit, and an FEC processing unit. And data scrambling unit.
- the data frame fragmentation unit is configured to: when the GEM idle frame length + GEM data frame length ⁇ all GEM frame length + data frame framing threshold value, and the data frame length of the TC group frame is > 0:
- the data frames participating in the TC group frame are fragmented to obtain the data frame participating in the fragmentation.
- the GEM frame header is added, and the data frame of the GEM frame header is added to the GEM frame.
- the updated GEM data frame length the GEM data frame length before the update + the GEM frame frame length + The data frame length of the TC group frame.
- the data frame encryption unit is configured to: encrypt the data frame encapsulated into the GEM frame by the data frame fragmentation unit according to an encryption algorithm specified by the PON protocol (for example, AES128).
- the idle frame insertion unit is configured to: when the idle frame needs to be inserted, if the GEM idle frame length + the GEM data frame length + the path length from the data frame framing circuit to the FEC processing circuit ⁇ all GEM frame lengths, and participate in the framing When the data frame length is 0:
- the length of the GEM idle frame is updated after inserting the idle frame of the following length, and the workflow of the idle frame insertion unit is re-executed;
- the FEC processing unit is used to: increase the FEC according to the FEC algorithm specified by the PON protocol Check byte; FEC function is an optional function. When the circuit configuration does not need to support FEC, the FEC processing unit processing unit only updates all GEM frame lengths.
- the data scrambling unit is configured to: scramble the line data according to the scrambling algorithm specified by the PON protocol; and scramble the line data.
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Abstract
Description
Claims (8)
- 一种无源光网络中传输汇聚层组帧的实现方法,其特征在于,该方法包括以下步骤:步骤A:当GEM空闲帧长度+GEM数据帧长度<所有GEM帧长度+数据帧组帧门限值、并且参与TC组帧的数据帧长度>0时,若GEM帧总长度-GEM空闲帧长度-GEM数据帧长度<GEM帧帧头长度+参与TC组帧的数据帧长度;将参与TC组帧的数据帧进行分片,得到参与分片的数据帧,将参与分片的数据帧增加GEM帧头后,封装至GEM帧,封装至GEM帧的数据帧的长度=GEM帧总长度-GEM空闲帧长度-GEM数据帧长度-GEM帧帧头长度,转到步骤B;步骤B:当需要插入空闲帧时,若GEM空闲帧长度+GEM数据帧长度+从数据帧组帧电路到FEC处理电路之间的路径长度<所有GEM帧长度、并且参加组帧的数据帧长度=0时,若GEM帧总长度-GEM空闲帧长度-GEM数据帧长度是否≤最小长度的空闲帧,则插入以下长度空闲帧,形成TC组帧,插入空闲帧的长度=GEM帧总长度-GEM空闲帧长度-GEM数据帧长度。
- 如权利要求1所述的无源光网络中传输汇聚层组帧的实现方法,其特征在于:步骤A中若所述GEM帧总长度-GEM空闲帧长度-GEM数据帧长度≥GEM帧帧头长度+参与TC组帧的数据帧长度,则增加GEM帧头、并将增加GEM帧头的数据帧封装至GEM帧,更新GEM数据帧长度和参与TC组帧的数据帧长度后,重新执行步骤A;更新后的GEM数据帧长度=更新前的GEM数据帧长度+GEM帧帧头长度+参与TC组帧的数据帧长度。
- 如权利要求1所述的无源光网络中传输汇聚层组帧的实现方法,其特征在于:步骤B中若所述GEM帧总长度-GEM空闲帧长度 -GEM数据帧长度是否>最小长度的空闲帧,则插入以下长度的空闲帧后更新GEM空闲帧长度,重新执行步骤B;插入空闲帧的长度=所有GEM帧长度-GEM空闲帧长度+GEM数据帧长度-路径长度;更新后的GEM空闲帧长度=更新前GEM空闲帧长度+插入空闲帧的长度。
- 如权利要求1至3任一项所述的无源光网络中传输汇聚层组帧的实现方法,其特征在于:步骤A之前还包括以下步骤:将TC组帧所有GEM帧长度全部置0,所有GEM帧长度包括GEM数据帧长度和GEM空闲帧长度。
- 如权利要求1至3任一项所述的无源光网络中传输汇聚层组帧的实现方法,其特征在于:步骤A和步骤B中所述GEM帧总长度=TC组帧的总长度-数据开销;所述数据开销长度包括TC层开销和FEC开销。
- 一种实现权利要求1至5任一项所述方法的无源光网络中传输汇聚层组帧的实现系统,其特征在于:该系统包括数据帧分片单元和空闲帧插入单元;数据帧分片单元用于:当GEM空闲帧长度+GEM数据帧长度<所有GEM帧长度+数据帧组帧门限值、并且参与TC组帧的数据帧长度>0时,若GEM帧总长度-GEM空闲帧长度-GEM数据帧长度<GEM帧帧头长度+参与TC组帧的数据帧长度;将参与TC组帧的数据帧进行分片,得到参与分片的数据帧,将参与分片的数据帧增加GEM帧头后,封装至GEM帧,封装至GEM帧的数据帧的长度=GEM帧总长度-GEM空闲帧长度-GEM数据帧长度-GEM帧帧头长度;空闲帧插入单元用于:当需要插入空闲帧时,若GEM空闲帧长度+GEM数据帧长度+从数据帧组帧电路到FEC处理电路之间的路径 长度<所有GEM帧长度、并且参加组帧的数据帧长度=0时,若GEM帧总长度-GEM空闲帧长度-GEM数据帧长度是否≤最小长度的空闲帧,则插入以下长度空闲帧,形成TC组帧,插入空闲帧的长度=GEM帧总长度-GEM空闲帧长度-GEM数据帧长度。
- 如权利要求6所述的无源光网络中传输汇聚层组帧的实现系统,其特征在于,所述数据帧分片单元还用于:若GEM帧总长度-GEM空闲帧长度-GEM数据帧长度≥GEM帧帧头长度+参与TC组帧的数据帧长度,则增加GEM帧头、并将增加GEM帧头的数据帧封装至GEM帧,更新GEM数据帧长度和参与TC组帧的数据帧长度后,重新执行数据帧分片单元的工作流程;更新后的GEM数据帧长度=更新前的GEM数据帧长度+GEM帧帧头长度+参与TC组帧的数据帧长度。
- 如权利要求6所述的无源光网络中传输汇聚层组帧的实现系统,其特征在于,所述空闲帧插入单元还用于:若GEM帧总长度-GEM空闲帧长度-GEM数据帧长度是否>最小长度的空闲帧,则插入以下长度的空闲帧后更新GEM空闲帧长度,重新执行空闲帧插入单元的工作流程;插入空闲帧的长度=所有GEM帧长度-GEM空闲帧长度+GEM数据帧长度-路径长度;更新后的GEM空闲帧长度=更新前GEM空闲帧长度+插入空闲帧的长度。
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BR112019009969A2 (pt) | 2019-08-27 |
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