CN101257487B - Method for mapping service stream onto service transmission channel as well as optical network terminal - Google Patents

Abstract

The present invention provides a method for mapping a service flow to a service transmission channel, comprising: pre-saving the message characteristics of the service flow in an optical network terminal, the message characteristics including VLANID; after receiving the service flow, the optical network terminal , comparing the packet feature of the received service flow with the pre-stored packet feature, and if the two match, mapping the service flow to a passive optical network encapsulation mode port GEM PORT. The invention supports mapping service flows to different GEM PORTs according to VLAN ID or other characteristics of messages, and ensures the requirement of subdivided service QOS.

Description

Method for mapping service flow to service transmission channel and optical network terminal

technical field

The invention relates to the technical field of optical networks, in particular to a method for mapping service flows to service transmission channels and an optical network terminal in the technical field.

Background technique

The current broadband access technology is mainly divided into copper wire access technology and optical access technology. The access network implemented by optical access technology is called optical access network (OAN, optical access network). PON is an implementation technology of optical access network. PON technology is an optical access technology for point-to-multipoint transmission. As shown in Figure 1, the PON system consists of optical line terminal (OLT, Optical Line Terminal), optical distribution Network (ODN, Optical Distribute Network), optical network unit (ONU, OpticalNetwork Unit), of which:

OLT: Provides a network side interface (SNI, Service Node Interface) for OAN, and connects to one or more ODNs.

ODN: Passive optical splitting device. The ODN transmits the downlink data of the OLT to each ONU through optical splitting, and at the same time, the ODN transmits the uplink data of the ONU to the OLT through aggregation.

ONU: Provides a user-side interface (UNI, User Network Interface) for OAN and is connected to ODN at the same time. If the ONU also provides user port functions, such as ONU provides Ethernet user ports or POTS (Plain Old Telephone Service) user ports, it is called optical Network terminal (ONT, Optical Network Termination), generally, when there is no special description, ONU and ONT are collectively called ONT.

As shown in Figure 2 and Figure 3, in the general PON access technology, the downlink traffic of OLT is broadcast to ONT through TDM (time division multiplexing), and each ONT takes out its own data after receiving the traffic; the uplink traffic of ONT passes through the OLT Control, only specific ONTs are allowed to transmit data at the same time, and are transmitted to the OLT through TDMA (Time Division Multiple Access).

Giga-bit Passive Optical Network (GPON, Giga-bit Passive Optical Network) is the latest PON technical standard, and the GPON technical standard of the International Telecommunication Union (ITU-T) corresponds to G984.1, G984.2, G984.3, G984 .4 series.

The protocol stack of the GPON technical standard is shown in Figure 4, where:

GPON Transmission Convergence layer: GPON transmission convergence layer, referred to as GTC, is divided into two sublayers:

1) TC Adapter Sublayer: TC Adapter Sublayer, downlink, responsible for cutting the service data received from the ATM client into ATM cells, and cutting the service received from the GEM client into GEM data blocks; uplink, responsible for cutting the GTC frame ATM cells or GEM data blocks in the module are assembled into corresponding service data.

2) GTC Framing Sublayer: GTC frame sublayer, downlink, responsible for GTC TC frame framing processing, before ATM cells or GEM data blocks, add GTC TC frame headers according to PLOAM (Physical Layer Operation, Administration and Maintenance,) control information , form a complete GTC TC frame, and send it to the GPM layer; uplink, remove the frame header information from the GTC TC frame received from the GPM layer, and submit it to the TC adaptation sublayer for processing.

GPON Physical Media Dependent Layer: GPON physical media-related layer, responsible for the transmission of GTC frames on optical fibers.

PLOAM: responsible for PON physical layer operation, management and maintenance functions;

OMCI (ONU Management and Control Interface): ONU management control interface, OLT realizes ONT control function through OMCI, OMCI data is encapsulated into ATM cell or GEM data block transmission like ordinary business data.

The GTC layer of GPON provides two encapsulation methods for service data, ATM encapsulation method and passive optical network encapsulation method (GEM, GPON Encapsulation Method). The ATM encapsulation method encapsulates service data in 53-byte ATM cells for transmission. The transmission method is fixed-length ATM cells; GEM is variable-length encapsulation, which supports changing the length of the GEM encapsulation frame according to the length of the service data frame. In the GPON GTC layer, T-CONT is the basic control unit, and T-CONT is identified by ALLOC-ID, and the ALLOC-ID of each T-CONT is uniformly allocated by OLT. In GEM encapsulation mode, T-CONT internally multiplexes service streams through PORT, and PORT is identified by PORT-ID; in ATM encapsulation mode, T-CONT internally multiplexes service streams through PVP/PVC, and PVP/PVC through VPI/VCI (virtual channel identifier/virtual channel identifier) identifier.

The following descriptions for the GEM mode are also applicable to the ATM mode.

As shown in Figure 5, the PON interface of an OLT supports access to multiple ONTs (ONUs), each ONT (ONU) supports one or more T-CONTs, and each T-CONT supports one or more GEM PORTs. Because the upstream service flow from the ONT to the OLT is transmitted through time division multiple access, only one ONT can transmit data upstream at a time, and the OLT allocates a time window for the ONT to transmit data upstream, and the ONT completes the transmission of the upstream data within the allocated time window . The basic control unit for the OLT to control the upstream service flow of the ONT is the T-CONT, that is, the OLT allocates time windows based on the T-CONT. The T-CONT transmission time window macroscopically represents the T-CONT uplink transmission bandwidth. The longer the time window allocated by the OLT to the T-CONT and the higher the frequency, the greater the T-CONT uplink transmission bandwidth.

The GPON system supports dynamic bandwidth assignment (DBA, dynamic bandwidth assignment) mechanism, according to the bandwidth requirements of T-CONT, dynamically allocates the uplink bandwidth of T-CONT, and improves the utilization rate of uplink bandwidth. T-CONT supports 5 types:

T-CONT Type 1: Fixed bandwidth (Fixed bandwidth);

T-CONT type 2: guaranteed bandwidth (Assured bandwidth);

T-CONT Type 3: Non-assured bandwidth (Non-assured bandwidth);

T-CONT type 4: best effort bandwidth (Best effort bandwidth);

T-CONT type 5: a mixed mode of the above four methods.

T-CONT type 1 is a fixed allocated bandwidth, even if T-CONT has no traffic transmission, OLT will allocate bandwidth for T-CONT; T-CONT type 2 allocates bandwidth to T-CONT when T-CONT does not transmit data, T-CONT can guarantee the bandwidth when transmitting data; T-CONT type 3 and T-CONT type 4 cannot guarantee the bandwidth of T-CONT, and the priority of T-CONT type 3 is higher than that of T-CONT type 4.

Before transmitting data, the OLT and ONT first negotiate the service transmission channel, and the negotiation of the service channel is realized through OMCI control messages. The service transmission channel in the GEM mode is called GEM PORT (GEM port). The OLT assigns the PORT-ID of the service transmission channel GEM PORT to the ONT. The PORT_ID is globally unique, that is, different service flows are assigned different PORT_IDs.

The downlink data from OLT to ONT is transmitted to all ONTs by broadcasting, and the TC adaptation sublayer of ONT in the protocol stack will receive the business data carried by all GEM PORTs sent by OLT. The GEM PORT that carries business data is not necessarily allocated by the OLT for this ONT. The ONT has no right to receive traffic that does not belong to its own GEM PORT. Therefore, the ONT performs PORT_ID filtering based on the GEM PORT at the TC adaptation sublayer. Only the OLT passes through the OMCI channel for Only the data carried by the GEM PORT assigned PORT_ID by this ONT is received (corresponding to the PORT-ID Filter function of the GPON protocol stack in Figure 4). The uplink data from ONT to OLT is transmitted by unicast. ONT carries user data in GEM PORT according to PORT_ID allocated by OLT, and sends data within the transmission time window of T-CONT to which GEM PORT belongs.

As shown in Figure 6, the ONT function is divided into two parts, the GPON protocol processing module and the service processing module. The GPON protocol processing module is the core module of the ONT, responsible for the realization of the GPON protocol stack, where the PON TC layer function corresponds to the GPON transmission and convergence layer function in the GPON protocol stack, and the ODN interface function corresponds to the GPON physical media related layer in the GPON protocol stack Function, business processing module implements business adaptation function, business multiplexing/demultiplexing connects PON TC layer function module and business processing module, and realizes the mapping relationship between business traffic and GEM PORT, and the dotted line box indicates the function that can be realized optionally module.

As shown in Figure 7, for the GPON system to carry Ethernet services, the corresponding service adaptation module is a Media Access Control (MAC, Media Access Control) bridge module (or a simple Ethernet port adaptation module), and the MAC bridge module implements Ethernet Network switching function, supporting the access of multiple Ethernet ports. The MAC bridge module receives Ethernet packets from the external Ethernet port P1, port P2 and port P3, and switches the Ethernet packets to the internal network connected to the business multiplexing/demultiplexing module through the internal Ethernet switching function. on Ethernet port P0.

The service multiplexing/demultiplexing functional module receives Ethernet type service flow from the internal Ethernet port, classifies it according to the characteristics of the service flow (such as the 802.1P priority of the service flow), and divides it into different service flow classes, each class Business flows are mapped to different GEM PORTs. Because different T-CONT types have different quality-of-service (QoS, quality-of-service) characteristics, for example, service flows that need to guarantee bandwidth and delay sensitive services such as VOIP service flows can be distinguished and carried on T-CONT types 2 (thus the bandwidth can be guaranteed) in the GEM PORT.

At present, the GPON protocol classifies the user service flow by the 802.1p domain (802.1P priority field) in the Ethernet frame. Figure 8 shows the format of the Ethernet frame containing the 802.1p domain. As shown in Figure 9, the 802.1 The p priority mapping module receives the Ethernet type service class from the internal Ethernet port, and classifies the Ethernet packets according to the 802.1P priority field in the Ethernet packet, and maps the Ethernet packets with different 802.1p priorities to Different GEM PORTs, or multiple 802.1p priority Ethernet packets are mapped to one GEM PORT. Each GEMPORT is transmitted to the OLT through a separate T-CONT, or the traffic of multiple GEM PORTs is aggregated to one T-CONT for transmission to the OLT.

The specific 802.1p priority mapping operation is implemented through the OLT scheduling ONT. The OLT instructs the ONT to map the 802.1p priority through the OMCI channel, and instructs the ONT to process which GEM PORT the Ethernet packets with different 802.1p priorities are mapped to. OMCI is a configuration transmission channel defined in the GPON standard. The OMCI channel is established between the OLT and the ONT. When the ONT registers with the OLT, the OMCI channel between the ONT and the OLT is established. OMCI is a master-slave management protocol. OLT is the master device and ONT is the slave device. The OLT controls multiple ONT devices connected to the OLT through the OMCI channel. In the OMCI protocol, various data of OLT management ONT are abstracted into a protocol-independent management information base (MIB, protocol-independent Management Information Base), and the basic information unit of the management information base is a management entity (ME, manage entity). According to various types of ONT configurations, OMCI defines the OLT to control each ME of the ONT. The ONT realizes the configuration management function of each ME under the control of the OLT. The OMCI protocol defines the following MEs to support 802.1p mapping of user traffic

entity:

MAC Bridge Port Configuration Data: MAC bridge port configuration data ME;

802.1p mapper service profile: 802.1p mapping policy table ME;

GEM Interworking Termination Point: GEM Interworking Termination Point ME;

GEM Port Network CTP: GEM PORT network connection endpoint.

Among them, the MAC bridge port configuration data ME is responsible for the attribute management of various configuration data of the Ethernet port, and the key attribute fields contained in the MAC bridge port configuration data ME are shown in Table 1:

Table 1

attribute field MAC bridge port number MAC bridge port number endpoint type 0x1 indicates the external Ethernet port; 0x2 indicates the internal Ethernet port, which is connected to the GEM interaction termination point ME; 0x3 indicates the internal Ethernet port, which is connected to the 802.1p mapping policy table ME; endpoint pointer The endpoint type is 0x1, which means the external Ethernet port, and the field value is the physical attribute of the Ethernet port; the endpoint type is 0x2, which means the internal Ethernet port

port, connected to the GEM interaction termination point ME, the field value is the GEM interaction termination point ME; the termination type is 0x3, indicating an internal Ethernet port, connected to the 802.1p mapping policy table ME, and this field is the 802.1p mapping policy table ME; Other configuration properties (802.1d defines other configuration attribute values)

The 802.1p mapping policy table ME is responsible for the mapping of Ethernet packets to GEM PORT. The key attribute fields contained in the 802.1p mapping policy table ME are shown in Table 2:

Table 2

attribute field 802.1p value = 000 (priority 0) corresponding to the GEM interaction termination point ME pointer The pointer points to the GEM interaction endpoint ME corresponding to the Ethernet packet whose 802.1p value is equal to 000 802.1p value = 001 (priority 1) corresponding to the GEM interaction termination point ME pointer The pointer points to the GEM interaction endpoint ME corresponding to the Ethernet packet whose 802.1p value is equal to 001 802.1p value = 010 (priority 2) corresponding to the GEM interaction termination point ME pointer The pointer points to the GEM interaction endpoint ME corresponding to the Ethernet packet whose 802.1p value is equal to 010 802.1p value = 011 (priority 3) corresponding to the GEM interaction termination point ME pointer The pointer points to the GEM interaction endpoint ME corresponding to the Ethernet packet whose 802.1p value is equal to 011 802.1p value = 100 (priority 4) corresponds to the GEM interaction termination The pointer points to the GEM interaction endpoint ME corresponding to the Ethernet packet whose 802.1p value is equal to 100

point ME pointer 802.1p value = 101 (priority 5) corresponding to the GEM interaction termination point ME pointer The pointer points to the GEM interaction endpoint ME corresponding to the Ethernet packet whose 802.1p value is equal to 101 802.1p value = 110 (priority 6) corresponding to the GEM interaction termination point ME pointer The pointer points to the GEM interaction endpoint ME corresponding to the Ethernet packet whose 802.1p value is equal to 110 802.1p value = 111 (priority 7) corresponding to the GEM interaction termination point ME pointer The pointer points to the GEM interaction endpoint ME corresponding to the Ethernet packet whose 802.1p value is equal to 111

The GEM interaction termination point ME corresponds to the GEM PORT network connection termination point ME one by one, and is responsible for connecting the 802.1p mapping policy table ME and the GEM PORT network connection termination point ME. The ME attribute fields of the GEM interaction endpoint are shown in Table 3:

table 3

GEM PORT network connection endpoint ME pointer Pointer to the GEM PORT network connection endpoint ME to which the GEM interaction endpoint ME is connected Other business configuration properties Other business configuration attribute definitions

The GEM PORT network connection endpoint ME is responsible for the configuration functions related to GEM PORT. The GEM PORT network connection endpoint ME attribute fields are shown in Table 4:

Table 4

GEM PORT value The value of GEM PORT_ID, which is set by the OLT through the OMCI channel Other business configuration properties Other business configuration attribute definitions

As shown in the ME relationship diagram in Figure 10, the GEM interaction endpoint ME is in one-to-one correspondence with the GEM PORT network connection endpoint ME, and is responsible for connecting the 802.1p mapping policy table ME with the GEMPORT network connection endpoint ME. The GEM PORT network connection endpoint ME is responsible for GEMPORT-related configuration functions, and the 802.1p priority is an optional supported function. The 802.1p mapping policy table ME corresponds to 8 GEM PORT network connection endpoint MEs.

Currently, in the GPON technical standard, ONT only supports the function of mapping Ethernet packets to GEM PORT through 802.1p priority, but does not support VLAN ID, DSCP domain of IP layer, IP or MAC source address, IP or MAC destination address, protocol The type, TCP/UDP port number or other characteristics of the packet are mapped to different GEM PORTs. If the characteristics of the above messages cannot be mapped to different GEM PORTs, special QOS services cannot be provided for messages with the above characteristics through a separate T-CONT (GEM PORT belongs to the T-CONT, and the OLT schedules QOS through the T-CONT). For the situation that needs subdivided services to ensure QOS, the current standard cannot meet the requirements.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for mapping service flows to service transmission channels in a passive optical network system, which overcomes that the service flow mapping method in the prior art does not support the DSCP domain through VLAN ID, IP layer, IP Or the MAC source address, IP or MAC destination address, protocol type, TCP/UDP port number or other characteristics of the message map the service flow to different service transmission channels, so it cannot meet the shortcomings of the QOS requirements for subdivided services.

An embodiment of the present invention provides a method for mapping a service flow to a service transmission channel, comprising: pre-saving the message characteristics of the service flow in an optical network terminal, the message characteristics including a VLAN ID; the optical network terminal receiving the service After streaming, compare the message characteristics of the received service flow with the pre-saved message characteristics, and if the two match, map the service flow to the passive optical network encapsulation mode port GEM PORT.

Correspondingly, an embodiment of the present invention provides an optical network terminal, including an optical network protocol processing module, a service processing module, and a general service flow mapping module disposed in the optical network protocol processing module or independently, wherein the The general service flow mapping module is used to compare the message characteristics of the received service flow with the pre-saved message characteristics, and if the two match, the service flow is mapped to the passive optical network encapsulation mode port, so The above packet characteristics include VLAN ID.

The present invention supports the mapping of service flows to different GEM PORTs according to VLAN ID characteristics through a new implementation method of mapping user service flows to GEM PORTs, thereby ensuring the requirements for subdivided service QOS.

Description of drawings

FIG. 1 is a schematic diagram of a PON system in the prior art;

FIG. 2 is a schematic diagram of PON downlink data transmission in the prior art;

FIG. 3 is a schematic diagram of PON uplink data transmission in the prior art;

Fig. 4 is a schematic diagram of the prior art GPON protocol stack;

FIG. 5 is a schematic diagram of a GEM multiplexing service flow mode in the prior art;

Fig. 6 is a schematic diagram of a prior art ONT functional module;

Fig. 7 is a schematic diagram of an ONT functional module supporting Ethernet access in the prior art;

Fig. 8 is the Ethernet frame format that contains 802.1p field in the prior art;

Fig. 9 is a schematic diagram of prior art ONT realizing user traffic classification through 802.1p domain;

Fig. 10 is a prior art ME relationship diagram;

Fig. 11 is a schematic diagram of an ONT functional module supporting general service flow mapping in the present invention;

Fig. 12a is a general service flow mapping ME relationship diagram of the present invention supporting mapping scheme 1 (directly mapping the service flow to a specified service transmission channel, and optionally remarking the priority mark of the service flow at the same time);

Fig. 12b is that the present invention supports mapping scheme two (re-labeling the priority mark of service flow, according to message priority the service flow is mapped to the specified service transmission channel) general service flow mapping ME relationship diagram;

Fig. 13 is a configuration flowchart of the general service flow mapping of the present invention;

Fig. 14 is a flow chart of canceling the general service flow mapping configuration in the present invention;

Fig. 15 is a message processing flow chart of ONT supporting general service flow mapping of the present invention.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:

The message feature is the value of a certain feature field in the message data frame. For example, for the IP address 10.11.1.1, the value of the message feature is 4 bytes (00001010, 00001011, 00000001, 00000001). The packet feature offset byte count is the offset byte count between the packet feature field and the packet (data frame) header. For example, the offset byte count between the source IP address field and the Ethernet packet header is 26.

In order to overcome the disadvantage that the existing technology cannot support the mapping of service flows according to the message characteristics of different services, the present invention first determines the message characteristics of different services and the number of offset bytes of the message characteristics, and saves them in the optical network terminal , for example, we can determine the following set of message characteristics:

1. Ethernet source address and Ethernet source address segment;

2. Ethernet destination address and Ethernet destination address segment;

3. VLAN ID;

4. 802.1p priority;

5. IP source address and source IP address segment;

6. Destination IP address and destination IP address segment;

7. IP DSCP domain;

8. IP protocol type;

9. TCP/UDP port number;

In practical applications, we can continuously expand the message feature group to include the message features in the general message feature representation method.

After receiving the service flow, the optical network terminal determines the part of bytes in the service flow data frame with the same number of bytes as the message characteristic in the service flow data frame one by one according to the packet characteristic offset byte number, and compares it with the packet characteristic , if the two match, stop the comparison operation. There are two options for the following actions. Mapping option 1: directly map the service flow to the specified service transmission channel, and optionally remark the priority mark of the service flow at the same time; mapping Solution 2: Re-mark the priority mark of the service flow, and map the service flow to the designated service transmission channel according to the re-marked packet priority. The service transmission channel can be GEM PORT in GEM mode, or PVP/PVC in ATM encapsulation mode.

The length of the message feature is not limited, but in practical applications, in order to facilitate hardware processing, the length of the message feature is preferably an integer power of 2, such as 4, 8, 16 bytes and so on.

If the message features are continuous bytes in the message, the previous method can meet the requirements of hardware processing, but the message features are not continuous bytes in the message, but two mutually independent byte segments, For example, take out the message of source IP address and TCP port number identical feature, preceding method can't realize; For the situation that message feature is not continuous byte in message, the present invention carries out the mask in message by the mask of message feature. Filter the non-message feature bytes sandwiched between the message features. The representation of the message feature mask is that the feature bits that are really needed in the message feature field are 1, and the feature bits that are not needed in the middle are 0. This representation method is called 1 matching representation (or 0 matching representation: the feature bit that is really needed is 0, and the feature bit that is not needed in the middle is 1, and the following descriptions all use 1 matching representation), the true The required message feature is the operation result of the message feature field and the message feature mask according to the bit-AND operation; in this way, through the message feature, the message feature mask, and the message feature offset byte number By combining them, any message feature in the message can be determined conveniently, flexibly, and quickly, including the aforementioned nine message features and other message features.

For different message features, the present invention designs and stores corresponding masks in the optical network terminal, for example, if we intend to identify a message whose source IP address is a network segment of 10.11.1.0～10.11.1.255, then The message feature has 4 bytes, and the value corresponding to 10.11.1.1 is (00001010, 00001011, 00000001, 00000001), if we design the mask as (11111111, 11111111, 11111111, 00000000), then the mask and the report Carry out a bitwise AND operation on the file characteristics, and the obtained operation result represents the characteristics of the network segment from 10.11.1.0 to 10.11.1.255.

After receiving the service flow, the optical network terminal performs a bitwise AND operation on the mask and message characteristics one by one to obtain the first operation result, and puts the mask and the service flow data frame determined according to the number of offset bytes of the message characteristic into , perform bitwise AND operation on some bytes with the same number of bytes as the characteristics of the message, to obtain the second operation result, compare the first operation result with the second operation result, if the two match, stop the comparison operation, and the following There are two options for the action. Mapping option 1: directly map the service flow to the specified service transmission channel, and optionally remark the priority mark of the service flow at the same time; mapping option 2: remark the priority mark of the service flow, according to The remarked packet priority maps the service flow to the specified service transmission channel. This method is also applicable to the case where the packet features are consecutive bytes in the packet.

As shown in Figure 11, in order to map user service messages with different message characteristics into specified service transmission channels, the present invention designs a general service flow mapping module for the ONT, and the general service flow mapping module is connected with the service processing module. And the general service flow mapping module is used to offset the number of bytes according to the stored message characteristics of different services and the corresponding message characteristics. After receiving the service flow, determine the service flow one by one according to the number of offset bytes of the message characteristics In the data frame, some bytes with the same number of bytes as the characteristics of the message are compared with the characteristics of the message. If the two match, the comparison operation is stopped. There are two options for subsequent actions. Mapping option 1: Directly map the service flow to the specified service transmission channel, and optionally remark the priority mark of the service flow at the same time; Mapped to the specified service transmission channel.

The further optimization of the general service flow mapping module is to perform bitwise AND operation on the mask and message characteristics one by one after receiving the service flow according to the mask of the saved message characteristics of different services to obtain the first As a result of the operation, perform a bitwise AND operation on the mask and some bytes in the service flow data frame determined according to the number of offset bytes of the message feature, which have the same number of bytes as the message feature, to obtain the second operation result , the result of the first operation is compared with the result of the second operation, and if the two match, the comparison operation is stopped. There are two options for subsequent actions. Mapping option 1: directly map the service flow to the specified service transmission channel, which can be Choose to remark the priority mark of the service flow at the same time; mapping scheme 2: remark the priority mark of the service flow, and map the service flow to the designated service transmission channel according to the remarked packet priority.

In order to map the identified service flow to the GEM PORT, the general service flow mapping module receives Ethernet packets from the internal Ethernet port connected to the MAC bridge, and according to the service flow identification strategy configured by the system, the Ethernet Network packets are classified, and Ethernet packets with different packet characteristics are directly mapped to different GEM PORTs, and the priority marks of service flows can be remarked at the same time, or Ethernet packets with different packet characteristics are first The packets are remarked with different priorities, and the packets are mapped to different GEM PORTs according to the remarked packet priority marks. Different GEM PORTs are aggregated into one T-CONT or carried by a separate T-CONT. Under the scheduling of the T-CONT by the OLT, the ONT sends data to the OLT based on the T-CONT.

The OLT is responsible for delivering the service flow identification policy to the general service flow mapping module of the ONT. Specifically, the OLT configures the general service flow mapping module of the ONT through the OMCI message.

It is not feasible to use the management method of 802.1p mapping policy table ME in the GPON standard to map user service packets with different characteristics to GEM PORT or PVP/PVC. The 802.1p mapping policy table ME is based on 8 different values of 802.1p (0~7), defines the corresponding GEM interaction termination point ME pointer for each 802.1p value. When the IP address is used as the feature of the message, the number of IP addresses is 2 to the 32nd power. When the VLAN ID is used as the feature of the message, the number of VLAN IDs is 4096. If the corresponding feature of each message is specified GEM interaction endpoint ME pointer, and the managed entries will be very complicated. Therefore, the present invention defines a new general-purpose service flow mapping ME to maintain the message feature, the mask of the message feature and the number of offset bytes of the message feature, and supports the general message feature representation method of the present invention. The attribute fields contained in the general service flow mapping ME are shown in Table 5:

table 5

The number of general message feature representation items in the general service flow mapping ME is determined according to the system specifications of the OLT and ONT. The general message feature representation item N (N is an odd number) contains three fields, which are used to store the message feature and mask respectively. , Packet characteristic offset byte number, the length of the three fields can be flexibly defined.

The GEM PORT-ID is stored in the corresponding attribute field of the corresponding GEM PORT network connection termination point ME, and the GEM interaction termination point ME stores a pointer for locating the GEM PORT network connection termination point ME.

The MAC bridge port configuration data ME is responsible for the attribute management of various configuration data of the Ethernet port. If the mapping scheme 1 is adopted, the original MAC bridge port configuration data ME must also be modified, and the attribute fields contained in the new MAC bridge port configuration data ME As shown in Table 6:

Table 6

If mapping scheme 1 is adopted, the ME relationship diagram supporting general traffic mapper ME is shown in Figure 12a, where General Traffic Mapper Service Profile is the newly added general traffic mapper ME.

If the mapping scheme 2 is adopted, the ME relationship diagram supporting the general traffic mapper ME is shown in Figure 12b, where the General Traffic Mapper Service Profile is the newly added general traffic mapper ME.

The configuration process of the general service flow mapping ME is shown in Figure 13 (taking the configuration of an attribute in the same OMCI channel message as an example), and the description is as follows:

1. Configure the terminal to notify the OLT to configure the ONT general service flow mapping ME attribute connected to the OLT. The configuration parameters are ONUID, packet characteristics, packet characteristic mask, packet characteristic offset byte number, GEM PORT-ID; configuration parameter indication Packets that meet the characteristics of the ONT are mapped to GEMPORT-ID. In the actual implementation process, the three items of the packet characteristics, packet characteristic mask, and packet characteristic offset bytes in the parameters sent by the terminal to the OLT can be configured by the user. Easy-to-understand methods such as VLAN ID, IP address, etc., on the OLT, split the VLAN ID and IP address into packet characteristics, packet characteristic mask, and packet characteristic offset bytes and send them to the ONT ;

2. The OLT converts the GEM PORT data carried in the configuration terminal parameters into the GEM interaction endpoint ME pointer corresponding to the GEMPORT one-to-one. The OLT sends a message requesting configuration of the ONT general service flow mapping ME attribute through the OMCI channel. The configuration parameters are ONUID, Message feature, message feature mask, message feature offset byte number, GEM interaction endpoint ME pointer, remark message priority mark;

3. After the ONT configuration is completed, a success or failure response message is returned.

The process of canceling the general service flow mapping ME attribute configuration is shown in Figure 14 (taking the same OMCI channel message as an example to cancel an attribute configuration), and the description is as follows:

1. Configure the terminal to notify the OLT to cancel the attribute configuration of the general service flow mapping ME of the ONT connected to the OLT. The parameters are ONUID, message feature, message feature mask, and message feature offset byte number. The terminal is configured in the actual implementation process Among the parameters sent to the OLT, the three items of message feature field, message feature field mask, and message feature field offset byte number can be configured in a way that is easy for users to understand, such as VLAN ID, IP address, etc., on the OLT Split the VLAN ID and IP address into three items: message feature, message feature mask, and message feature offset byte number and send them to ONT;

2. The OLT sends a message through the OMCI channel requesting to cancel the ME attribute configuration of the ONT general service flow mapping. The parameters are ONUID, message feature, message feature mask, message feature offset byte number, and 0;

3. After the ONT configuration is completed, a success or failure response message is returned.

Mapping Scheme 1 The message processing flow on the ONT is shown in Figure 15. The dotted line part is the newly added processing flow. The ONT uses three items: message feature, message feature mask, and message feature offset bytes Match some bytes of Ethernet packets.

The message processing of the optical network terminal includes steps:

D1. The optical network terminal receives the Ethernet message from the internal Ethernet port of the media access control bridge;

D2. The optical network terminal judges whether the media access control bridge port configuration data management entity is connected to the general service flow mapping management entity, if so, execute step D4, otherwise execute step D3;

D3. All messages are mapped to the fixed passive optical network encapsulation port, and the operation is ended;

D4. Searching item by item for the general service flow mapping management entity to store the attribute field of the message feature and its mask and message feature offset byte number, and performing a bitwise AND operation on the mask and the message feature to obtain the first As a result of the operation, perform a bitwise AND operation on the mask and some bytes in the service flow data frame determined according to the number of offset bytes of the message feature, which have the same number of bytes as the message feature, to obtain the second operation result , compare the first operation result with the second operation result, if they match, go to step D5, otherwise go to step D6;

D5. Map the message to the specified PON encapsulation port according to the mapping rules, and end the operation;

D6. Perform error alarm processing and end the operation.

The following is the message processing flow of the ONT using the message feature and the number of bytes of the message feature offset to match some bytes of the Ethernet message:

1. The ONT receives the Ethernet message from the internal Ethernet port of the MAC bridge;

2. The ONT judges whether the MAC bridge port configuration data ME is connected to the general service flow mapping ME. If the MAC bridge port configuration data ME is connected to the general service flow mapping ME, it means that the ONT supports the general service flow mapping operation and proceeds to step 4, otherwise Go to step 3;

3. All messages are mapped to the fixed GEM PORT, end;

4. Search the general service flow mapping ME attribute field item by item. If some bytes in the Ethernet message determined by the number of message feature offset bytes match the message feature, go to step 5 for processing, otherwise go to step 6 deal with;

5. Map the message to different GEM PORTs according to the mapping rules, end;

6. Perform error alarm processing and end.

The packet processing flow on the ONT of mapping scheme 2 is similar to the packet processing flow on the ONT of mapping scheme 1, and will not be repeated here.

Although the present invention has been illustrated and described with reference to preferred embodiments thereof, those skilled in the art will understand that various changes in form and details of the present invention may be made without departing from the present invention. The scope of the invention is defined by the appended claims.

Claims (7)

1. A method for mapping service flows to service transmission channels, comprising: In the optical network terminal, the message characteristics of the service flow are pre-saved, and the message characteristics include a VLAN ID; After receiving the service flow, the optical network terminal compares the packet characteristics of the received service flow with the pre-saved packet characteristics, and if the two match, maps the service flow to the passive optical network Encapsulation mode port GEM PORT. 2. The method for mapping service flows to service transmission channels according to claim 1, wherein the message characteristics further include: source IP, source MAC, destination IP, destination MAC, protocol type and TCP/UDP One or more combinations of port numbers. 3. The method for mapping service flows to service transmission channels according to claim 1, further comprising: While mapping the service flow to the passive optical network encapsulation mode port GEM PORT, remark the priority mark of the service flow. 4. The method for mapping a service flow to a service transmission channel according to claim 1, wherein, before the said service flow is mapped to the passive optical network encapsulation mode port GEMPORT, further comprising: Remarking the priority mark of the service flow according to the packet feature; The mapping of the service flow to the passive optical network encapsulation mode port GEM PORT specifically includes: Mapping the service flow to the passive optical network encapsulation mode port GEM PORT according to the remarked priority mark. 5. The method for mapping service flows to service transmission channels according to claim 1, characterized in that, The method is used in gigabit passive optical network GPON. 6. An optical network terminal, comprising an optical network protocol processing module, a service processing module, and a general service flow mapping module arranged in the optical network protocol processing module or independently, wherein the general service flow mapping module , for comparing the packet characteristics of the received service flow with the pre-saved packet characteristics, and if the two match, map the service flow to a passive optical network encapsulation mode port, and the packet characteristics include VLAN ID. 7. The optical network terminal according to claim 6, characterized in that, The optical network terminal is an optical network terminal in a gigabit passive optical network GPON.

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