CN102685610B - A kind of apparatus and method of dynamic assignment operational administrative control interface bandwidth - Google Patents

Abstract

The invention provides a kind of device of dynamic assignment operational administrative control interface bandwidth, comprising: Configuration module, is Non-Assured type TCONT for configuring operation management control interface transmission container OMCI TCONT; Configuration information module, for configuring OMCI bandwidth mode and OMCI indicates alternately; Bandwidth calculation module, for calculating OMCI bandwidth.Present invention also offers a kind of method of dynamic assignment operational administrative control interface bandwidth.By the present invention, good better upload bandwidth utilisation and upgoing O MCI message transmission time delay can be obtained.

Description

Device and method for dynamically allocating bandwidth of operation management control interface

technical field

The invention relates to the communication field, and relates to a device and a method for dynamically allocating bandwidth of an operation management control interface in an XGPON system.

Background technique

10 Gigabit Passive Optical Network (10G-Gigabit Passive Optical Network, referred to as XGPON) is a communication protocol of passive optical network. XGPON adopts a point-to-multipoint topology.

The OMCI operation management control interface (Optical network unit management and control interface) is a management control interface in the XGPON system, which is transmitted through the designated TCONT transmission container (Transmission container) channel. The OMCI message is encapsulated in the XGEM (XG-PON encapsulation method, XGPON encapsulation mode) frame, which is used for the OLT (Optical line terminal) to actively manage the ONU (Optical network unit optical network unit), and the ONU automatically reports alarms and other information to the OLT. As shown in Figure 1, OLT101 is connected to many ONUs, and each ONU contains one or more TCONTs. The ALLOC ID (Allocation identifier) of the TCONT carrying the OMCI message is the same as the ONU ID by default, and the ALLOC ID It cannot be deleted or modified until the ONU is in the deactivated state. The channel carrying OMCI messages is called OMCC (ONU management and control channel, optical network unit management control channel).

Figure 2 is the uplink XGTC (XG-PON Transmission Convergence, XGPON transmission convergence layer) frame structure of XGPON, including the XGTC header (XGTC Header), uplink dynamic bandwidth report (DBRu), XGTC frame payload (XGTC Payload), uplink XGTC frame check (XGTC Trailer). The XGTC frame payload consists of one or more XGEM frames, and the XGEM frame includes an 8-byte XGEM frame header (XGEM Header) and an XGEM frame payload (XGEMPayload). As shown in Figure 2, the bandwidths occupied by different TCONTs of the same ONU can be connected together to form a Burst, or different Bursts. The bandwidths occupied by TCONTs of different ONUs must be different Bursts.

Dynamic Bandwidth Allocation (DBA for short) is a bandwidth allocation technology adopted by the XGPON system. DBA can dynamically adjust the uplink bandwidth according to 1) uplink traffic or 2) DBRu, or according to 3) uplink traffic and DBRu together with the Service Level Agreement (SLA for short), so as to fully utilize the uplink bandwidth the goal of. The DBA bandwidth allocation model includes three types of DBA bandwidth: Fixed Bandwidth, Assured Bandwidth, and Maximum Bandwidth. Fixed bandwidth exists inherently and does not change with traffic changes; Assured bandwidth changes according to traffic changes. When the traffic is not greater than the Assured bandwidth, the Assured bandwidth must be able to meet the traffic demand; Additional bandwidth ( Additional Bandwidth) may not be satisfied, mainly depends on whether there is remaining bandwidth available, the priority is the lowest.

TCONT types generated based on 3 types of DBA bandwidth, including:

1) Fixed type TCONT, only contains Fixed type bandwidth;

2) Assured type TCONT, only includes Assured type bandwidth;

3) Non-Assured non-guaranteed type, referred to as NA type TCONT, including Assured

Type bandwidth and Additional type bandwidth;

4) Best-Effort (BE for short) type TCONT, which only includes Additional type bandwidth;

5) Max type TCONT, including Fixed, Assured, Additional type bandwidth.

Figure 3 is the basic type of OMCI message format, the packet length is fixed at 48Bytes; Figure 4 is the extended type of OMCI message format, the packet length is N-1970Bytes.

In the existing OMCI bandwidth allocation technology, the OMCI bandwidth is allocated as the aforementioned first Fixed type bandwidth, which inherently occupies the uplink bandwidth unchanged. In the XGPON system, it is necessary to support 1023 ONUs. Calculated according to the fact that each ONU inherently occupies a Fixed-type OMCI bandwidth, each OMCI bandwidth is at least 56Bytes (8-byte XGEM Header+48-byte OMCI message ), a total of 57288Bytes is required, which has exceeded the total upstream bandwidth of 38870Bytes. In the scenario where 1023 ONUs are not fully configured, the OMCI bandwidth is inherently unchanged, but the amount of OMCI message interaction is small, which also causes a waste of upstream bandwidth.

Moreover, as shown in Figure 4, XGPON needs to support variable-length extended type OMCI messages. When long packets are transmitted when the length of the OMCI message is long, the existing OMCI bandwidth allocation technology is to allocate the aforementioned first Fixed-type bandwidth method, which will cause multiple slices of the uplink OMCI message, making the uplink OMCI message transmission time longer , and at the same time, the number of buffers that need to be occupied during the uplink reorganization process increases.

Contents of the invention

In view of the above two problems, the present invention proposes a device and method for dynamically allocating the bandwidth of the operation management control interface.

The invention provides a device for dynamically allocating the bandwidth of an operation management control interface, comprising: a configuration software module for configuring the operation management control interface transmission container OMCI TCONT as a Non-Assured type TCONT; a configuration information module for configuring the OMCI bandwidth mode Interact with OMCI flag; bandwidth calculation module, used to calculate OMCI bandwidth.

Further, when the OMCI interaction flag is configured to be enabled and invalid, the OMCI bandwidth of TCONT is not allocated; when the OMCI interaction flag is configured to be enabled and valid, the bandwidth calculation module calculates the OMCI bandwidth of TCONT.

Further, in the case where the OMCI bandwidth mode is a fixed packet length Baseline mode, the OMCI bandwidth is a fixed bandwidth, and the fixed bandwidth makes the ONU just send a complete fixed packet length OMCI message; in the OMCI bandwidth mode, it is extended In the case of packet length Extended mode, the OLT first sends a part of the bandwidth, which only allows the ONU to send just a part of the OMCI message included in the Message contentslength field, and then sends the remaining OMCI message bandwidth next time.

Further, the bandwidth calculation module is also used for parsing Message contents length, and calculating the remaining OMCI message length.

On the other hand, the present invention also provides a method for dynamically allocating the bandwidth of the operation management control interface, including: Step 1: configuring the operation management control interface transmission container OMCI TCONT as a Non-Assured type TCONT, configuring the OMCI bandwidth mode, and configuring the OMCI Interaction flag; step 2: the bandwidth calculation module judges whether the OMCI bandwidth of the TCONT needs to be allocated by detecting the OMCI interaction flag.

Further, when the OMCI interaction flag is disabled, the OMCI bandwidth of the TCONT is not allocated, and the OLT issues the minimum bandwidth, which only allows the ONU to report DBRu information; when the OMCI interaction flag is enabled, it is calculated according to the OMCI bandwidth mode OMCI bandwidth to be allocated by TCONT.

In the embodiment of the present invention, by allocating OMCI TCONTs to NA type TCONTs, on the basis of relatively low resource overhead and delay, timely allocation of OMCI bandwidth according to bandwidth requirements can be realized, and OMCI bandwidth can be recovered in time to solve the existing problem of configuring OMCI channels as The fixed bandwidth causes the problem that the available bandwidth of the uplink service is greatly reduced. Through the present invention, good uplink bandwidth utilization rate and uplink OMCI message transmission time delay can be obtained.

Description of drawings

Fig. 1 is the schematic diagram of the topological structure of XGPON network;

Fig. 2 is a schematic diagram of the XGTC frame structure and the XGEM frame structure of XGPON;

Fig. 3 is a schematic diagram of the OMCI message format of a fixed packet length;

Fig. 4 is a schematic diagram of the OMCI message format of variable packet length;

Fig. 5 is the device block diagram of the dynamic allocation OMCI bandwidth scheme of the present invention;

FIG. 6 is a flow chart of the scheme for dynamically allocating OMCI bandwidth in the present invention.

English words among Fig. 2, 3, 4, ask the inventor to assist to supplement Chinese (abbreviation can not be revised), English among Fig. 5 please assist to revise into Chinese expression. Please modify it directly in the picture. If it is not easy to modify, you can only consider whether it can be deleted

Detailed ways

Aiming at the problem that the OMCI bandwidth is assigned as Fixed bandwidth in the prior art, which inherently occupies the upstream bandwidth, resulting in low utilization of the upstream bandwidth, at the same time, in order to support better transmission of variable-length OMCI messages of XGPON, the present invention implements The example provides a kind of device and method for dynamically allocating the operation management control interface bandwidth, the embodiment of the present invention is as follows: OMCI TCONT is allocated as NA type TCONT, when there is no OMCI message interaction, only issue the minimum bandwidth, only when OLT and ONU When there is an OMCI message interaction requirement, the bandwidth that can accommodate OMCI messages will be issued. When the OMCI message process ends, the OMCI message bandwidth will be recovered in time. Based on the embodiment of the present invention, good uplink bandwidth utilization and uplink OMCI message transmission delay can be obtained.

In the OMCI message interaction process between the OLT and the ONU, which type of OMCI message is used depends on the OLT. In the embodiment of the present invention, by default, the OMCI message mode used when the OLT interacts with the ONU is the fixed packet length Baseline mode, referred to as mode A. In addition, the OLT uses the extended packet length Extended mode, also known as the variable packet length Extended mode, referred to as mode B. Only when the OLT uses the mode B to send the OMCI message, the ONU will return the OMCI message of the Extended mode.

Embodiments of the present invention are as follows: mode A) OLT constrains the ONU to use a fixed packet length mode, and now allocates a fixed OMCI bandwidth to the OMCI channel of the ONU, so that the upstream OMCI message does not need to be sliced;

Mode B) The OLT constrains the ONU to use the variable packet length mode and allocates its bandwidth twice. The bandwidth allocated for the first time satisfies the LENGTH field that can be carried to OMCI; the remaining OMCI length can be calculated according to LENGTH, and the bandwidth allocated for the second time allows the remaining part to be transmitted.

In addition, the scenarios of OMCI bandwidth allocation can include the following two situations:

Case 1: The OLT sends the OMCI message proactively, and the ONU responds to the OMCI message.

Case 2: The ONU actively reports the OMCI message, and obtains through Dbru whether the ONU has an OMCI message waiting to report the above situation. After the OMCI message interaction is completed, the bandwidth is released in time for service use.

The above two cases can include the processing methods of mode A and mode B.

As shown in Figure 5, it is a device block diagram of dynamically allocating OMCI bandwidth according to the embodiment of the present invention, including: configuration software module 501, which is used to configure OMCI TCONT as NA type TCONT; configuration information module 503, which is used to configure OMCI bandwidth mode, OMCI Interaction flags, and other SLA configuration information; the bandwidth calculation module 505 is responsible for calculating OMCI bandwidth.

Wherein, when the OMCI interaction flag is configured to be enabled, the bandwidth calculation module 505 calculates the OMCI bandwidth of the TCONT. In the case of mode A, the OMCI bandwidth is a fixed bandwidth, which only allows the ONU to send a complete OMCI message with a fixed packet length. The size of the fixed bandwidth is determined by the length of the OMCI message with a fixed packet length. In the case of mode B, the OLT first issues a part of the bandwidth, which only allows the ONU to send a part of the OMCI message included in the "Message contents length" message content length field, and the OLT parses the "Message contents length" through the bandwidth calculation module 505 ", the OLT can know the remaining OMCI message length through the bandwidth calculation module 505, so that the OLT can strive for the remaining OMCI message bandwidth in the next delivery, so as to solve the problem that the long-packet OMCI message is sliced multiple times when the OMCI bandwidth is a fixed bandwidth question.

Wherein, the configuration software module 501 can also serve as a man-machine interface to provide configuration input for the hardware, thereby enabling the configuration information module 503 to set the OMCI bandwidth mode and the OMCI interaction flag.

Preferably, the device in the embodiment of the present invention may further include a bandwidth generating module 507, which is responsible for generating the bandwidth table BWMAP of each TCONT, that is, the Band Width Map table. The BWMAP table is used to store the bandwidth calculated by the bandwidth calculation module 505, including the bandwidth stored in the BWMAP table will be carried in the downlink XGTC frame and sent to the ONU, and the bandwidth is used to control how the ONU sends data to the OLT.

As shown in Figure 6, be the flow chart of the dynamic distribution OMCI bandwidth scheme of the embodiment of the present invention, have included following steps:

Step 1: Configure OMCI TCONT as NA type TCONT, configure OMCI bandwidth mode, and configure OMCI interaction flag. The process of configuring the NA-type TCONT is an existing technology, and will not be repeated here.

In the case of no OMCI message exchange, the OLT delivers the minimum bandwidth, which only allows the ONU to report DBRu information.

When the ONU needs to automatically initiate OMCI message interaction, the ONU reports to the OLT through the DBRu information, and the OLT learns that the ONU has an OMCI message interaction request, and the OLT enables the "OMCI interaction flag" of the corresponding TCONT in the configuration information module 503 through the configuration software module 501.

When the OLT needs to actively initiate OMCI message interaction, the configuration software module 501 enables the "OMCI interaction flag" of the corresponding TCONT in the configuration information module 503 .

Preferably, the "OMCI bandwidth mode" of the corresponding TCONT in the initial state configuration information module 503 defaults to mode A. When the OLT wants to send the OMCI message of mode B, the “OMCI bandwidth mode” of the corresponding TCONT is configured as mode B through the configuration software module 501 .

There is no sequential requirement for configuring the NA type TCONT, configuring the OMCI bandwidth mode, and configuring the OMCI interaction flag above.

Step 2: The bandwidth calculation module 505 judges whether the OMCI bandwidth of the TCONT needs to be allocated by detecting the "OMCI interaction flag".

When the "OMCI Interaction Flag" is not enabled, the OMCI bandwidth of the TCONT is not allocated. When the "OMCI Interaction Flag" is enabled, the OMCI bandwidth calculation module 505 calculates the OMCI bandwidth of the TCONT.

In the case of mode A, the OMCI bandwidth is a fixed bandwidth, which only allows the ONU to send a complete OMCI message with a fixed packet length. The size of the fixed bandwidth is determined by the length of the OMCI message with a fixed packet length.

In the case of mode B, the OLT first sends a part of the bandwidth, which only allows the ONU to send a part of the OMCI message contained in the "Message contents length" field. By analyzing the "Message contents length", the OLT can know the remaining The length of the OMCI message, so that the OLT can strive for the remaining OMCI message bandwidth in the next delivery, so as to solve the problem that the long-packet OMCI message is sliced multiple times when the OMCI bandwidth is a fixed bandwidth.

Because the priority of the additional bandwidth of the NA type TCONT is the highest among all the additional bandwidths, second only to the Fixed and Assured type bandwidths; and because a large number of OMCI message exchanges generally occur at times when the uplink traffic is light, so in general Can be sent twice. However, if the second bandwidth is not enough to accommodate the remaining OMCI messages, it can be transmitted in three or more times.

Step 3: When the OMCI message interaction ends, 501 configures the software module to disable the "OMCI interaction flag" of the corresponding TCONT, and in the OMCI bandwidth calculation of the next DBA cycle, the 505 OMCI bandwidth calculation module detects the "OMCI interaction flag" of the corresponding TCONT If it is disabled, the OMCI bandwidth of this TCONT will not be allocated.

Above process step 1 to step 3 is the OMCI bandwidth allocation process of a TCONT in a DBA cycle in the embodiment of the present invention, the OMCI bandwidth allocation under the situation of a plurality of OMCI TCONTs needs to repeat this process multiple times in a DBA cycle.

The advantage of using NA-type TCONT is: NA-type TCONT includes Assured-type bandwidth and Additional-type bandwidth, and the priority of the Additional-type bandwidth of NA-type TCONT is higher than that of BE-type TCONT, which ensures that when the remaining uplink bandwidth is seized Has high priority. When there are OMCI messages that need to be exchanged between the OLT and the ONU, the Assured bandwidth ensures that bandwidth can be allocated for OMCI messages with fixed packet lengths, and when the total upstream bandwidth satisfies the Fixed and Assured bandwidths, there is still When the remaining bandwidth is available, the Additional type bandwidth can be allocated for the extended type OMCI message with variable packet length. If OMCI TCONT adopts Assured type TCONT, it cannot support bandwidth allocation for extended type OMCI messages with variable packet length; if BE type TCONT is used, it cannot guarantee that the required bandwidth can be allocated for fixed packet length type OMCI messages, and BE Type TCONT has the lowest priority when preempting the remaining upstream bandwidth; while Max type TCONT contains Fixed type bandwidth, which will also cause waste of upstream bandwidth. In consideration of the above factors, the embodiment of the present invention adopts the NA type TCONT as the OMCI TCONT type.

In the above-mentioned present invention, based on NA type OMCI TCONT bandwidth allocation during OMCI interaction, bandwidth allocation has the following characteristics: in the case of mode A, even when there is no OMCI message in the uplink, the bandwidth allocation of the uplink OMCI channel is also fixed of. In the case of mode B, the bandwidth allocation step of the uplink OMCI channel is divided into two parts. The OLT sends part of the bandwidth first so that the ONU can just send part of the OMCI messages included in the "Message contents length" field, and then the OLT sends the remaining OMCI message bandwidth. In the case that there is no OMCI message in the upstream, the OLT always sends only so that the ONU can just send part of the OMCI message bandwidth included in the "Messagecontents length" field. The advantage of the above bandwidth method is that during the OMCI interaction process, the uplink OMCI bandwidth is stable, and the delay of uplink receiving OMCI messages is low.

Of course, the present invention can also have other various embodiments, and those skilled in the art can make various corresponding changes and deformations according to the present invention without departing from the spirit and essence of the present invention, but these corresponding Changes and deformations should all belong to the protection scope of the claims of the present invention.

Claims (11)

1. A device for dynamically allocating bandwidth of an operation management control interface, comprising: The configuration software module is used to configure the operation management control interface transmission container OMCI TCONT as Non-Assured type TCONT; The configuration information module is used to configure the OMCI bandwidth mode and the OMCI interaction sign; The bandwidth calculation module is used to calculate the OMCI bandwidth. 2. The device according to claim 1, wherein when the OMCI interaction sign is configured to enable invalid, the OMCI bandwidth of TCONT is not allocated; when the OMCI interaction sign is configured to enable effective, the bandwidth calculation module calculates OMCI bandwidth of TCONT. 3. The device according to claim 1 or 2, characterized in that: In the case where the OMCI bandwidth mode is a fixed packet length Baseline mode, the OMCI bandwidth is a fixed bandwidth, and the fixed bandwidth makes the ONU just send a complete fixed packet length OMCI message; In the case where the OMCI bandwidth mode is the extended packet length Extended mode, the OLT first sends a part of the bandwidth, which only allows the ONU to just send a part of the OMCI message containing the Messagecontents length field of the message content length, and then sends the remaining part of the message next time. OMCI message bandwidth. 4. The device according to claim 3, characterized in that: the bandwidth calculation module is also used for parsing Message contents length, and calculates the remaining OMCI message length. 5. The device according to claim 1, wherein the configuration software module is used as a man-machine interface to provide configuration input for hardware, thereby enabling the configuration information module to set OMCI bandwidth mode and OMCI interaction sign. 6. device according to claim 1, is characterized in that, also comprises bandwidth generating module, is responsible for generating the Band Width Map table of each TCONT, and BWMAP table is used for the bandwidth of storage bandwidth calculation module calculation. 7. A method for dynamically allocating bandwidth of an operation management control interface, comprising: Step 1: Configure the operation management control interface transmission container OMCI TCONT as Non-Assured type TCONT, configure the OMCI bandwidth mode, and configure the OMCI interaction flag; Step 2: the bandwidth calculation module judges whether the OMCI bandwidth of the TCONT needs to be allocated by detecting the OMCI interaction sign. 8. The method of claim 7, wherein: When the OMCI interaction flag is disabled, the OMCI bandwidth of the TCONT is not allocated, and the OLT issues the minimum bandwidth, which only allows the ONU to report the DBRu information; When the OMCI interaction flag is enabled and valid, the OMCI bandwidth to be allocated by TCONT is calculated according to the OMCI bandwidth mode. 9. The method according to claim 8, wherein, in the step of calculating the OMCI bandwidth that TCONT needs to allocate according to the OMCI bandwidth pattern: When the OMCI bandwidth mode is a fixed packet length Baseline mode, the OMCI bandwidth is a fixed bandwidth, and the fixed bandwidth makes the ONU just send a complete fixed packet length OMCI message; When the OMCI bandwidth mode is the extended packet length Extended mode, the OLT first sends a part of the bandwidth, which only allows the ONU to just send a part of the OMCI message contained in the Message contents length field, and then sends the remaining OMCI message bandwidth next time . 10. The method according to claim 9, characterized in that: calculate the remaining OMCI message length by analyzing Messagecontentslength. 11. The method according to claim 7, further comprising step 3: when the OMCI message interaction ends, disabling the OMCI interaction flag of the TCONT.