WO2013082936A1

WO2013082936A1 - Method and system for allocating uplink bandwidth in passive optical network (pon) system

Info

Publication number: WO2013082936A1
Application number: PCT/CN2012/077949
Authority: WO
Inventors: 耿丹; 马壮; 郭勇; 何子安; 朱松林; 李长垒; 袁立权; 张德智
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-12-05
Filing date: 2012-06-29
Publication date: 2013-06-13
Also published as: CN103139105A; CN103139105B

Abstract

Disclosed are a method and system for allocating uplink bandwidth in passive optical network (PON), so as to solve the technical problem of the bandwidth allocation of optical network units (ONUs) in a mixed PON system. The solution is: optical line terminals (OLTs) transfer bandwidth allocation information of the uplink bandwidth to the ONUs through a bandwidth allocation channel, or the OLTs transfer the bandwidth allocation information of the uplink bandwidth to the ONUs through a management channel and the bandwidth allocation channel, wherein said bandwidth allocation information includes physical channel information and time information of data transmission; when the management channel and the bandwidth allocation channel are used to transfer the bandwidth allocation information, said management channel is used to transfer the physical channel information and said bandwidth allocation channel is used to transfer the time information of data transmission. In the present invention, the OLTs performing the bandwidth allocation on the physical channel and the time channel to the ONUs realizes the share of resources of the uplink time channel and physical channel among the ONUs, and improves the uplink transmission efficiency of ONUs.

Description

Uplink bandwidth allocation method and system in passive optical network system

The present invention relates to the field of communications technologies, and in particular, to an uplink bandwidth allocation method and system in a passive optical network system. Background technique

With the development of network technology, a large amount of voice, data, video and other services can be transmitted by using the network, so the bandwidth requirements are continuously increased, and a passive optical network (PON) is generated under such a demand.

The topology of the PON system is shown in Figure 1. The PON system usually consists of the optical line terminal (OLT) on the central side, the optical network unit (ONU) on the user side, and the optical distribution network (ODN), usually point-to-multipoint. Network structure. ODN consists of single-mode fiber and passive optical components such as optical splitters and optical connectors, providing optical transmission media for the physical connection between the OLT and the ONU. At present, the PON technology mainly includes a Time Division Multiplexing (TDM) PON system, a Wavelength Division Multiplexing (WDM) PON system, and an Orthogonal Frequency Division Multiplexing (OFDM) PON system. In a hybrid PON system, a hybrid PON system includes a wavelength division time division hybrid PON system, a frequency division time division hybrid PON system, and a wavelength division time division time division hybrid PON system.

In a time-division multiplexed PON system, such as a Gigabit-Capable Passive Optical Network (GPON) system, an Ethernet Passive Optical Network (EPON) system, and an XG-PON (10- In the Gigabit-capable passive optical network system and the 10-Gigabit-capable EPON system, the data transmission in the downlink direction (from the OLT to the ONU) is broadcast, and each ONU receives all the frames, and then according to the ONU-ID, GEM- Port ID, Allocation-ID, Logical Link Identity (LLID) Wait for information to get your own frame. For the data transmission in the uplink direction (from the ONU to the OLT), since each ONU needs to share the transmission medium, each ONU should arrange uplink data in its own time slot arranged by the OLT. Taking XG-PON as an example, the time slot allocated by the OLT to the ONU for transmitting uplink data is transmitted to the ONU through an allocation structure (Allocation Structure) in the downlink frame, as shown in FIG. 2 . The allocation structure is identified by the bandwidth allocation identifier (Alloc-ID field, Allocation Identifier, and is generally identified by the T-CONT, Transmission Container), Flags field (option of bandwidth allocation, 2 bits, one bit is used to indicate ONU) Whether to send the uplink dynamic bandwidth report (DBRu), another bit is used to indicate whether the ONU sends the uplink physical layer operation, management and maintenance (PLOAMu) message, and the start time (Start Time, which indicates the transmission convergence of the XG-PON sent by the ONU) The position of the first byte of the burst (XGTC burst) in the 125us upstream frame), Grant Size, Forced Awakening Indication (FWI), Burst Overhead Parameter (Bprofile), and Mixed Error Correction (HEC) composition.

When the ONU receives an Allocation structure, if the ONU determines that the Allocation structure is assigned to itself according to the Alloc-ID, the ONU performs a HEC check on the data in the received Allocation structure. If the verification result is correct, the ONU will be in the The StartTime time indicated by the Allocation structure starts to send data in the T-CONT whose bandwidth allocation identifier is Alloc-ID, and the length of the transmission data is the length of the Grant size field.

In the WDM-PON system, there are a plurality of light emitters of different wavelengths at the OLT, and the light wavelengths of the respective light emitters are λ(Π, λά 2, . . . , λά η, where λ (Π is OLT and the first The wavelength used to transmit downlink data during an ONU communication, λ (1 2 is the wavelength used by the OLT to transmit downlink data when communicating with the second ONU, ..., λ (1 η is sent when the OLT communicates with the nth ONU) The wavelength used by the downlink data; the emission wavelength of the transmitter at each ONU is different from the emission wavelength of the transmitter at the other ONU. For example, the emission wavelength of the transmitter used by the first ONU to send uplink data to the OLT is λιιΐ, The transmitting wavelength of the transmitter used by the two ONUs for transmitting uplink data to the OLT is λιι2, ..., and the transmitting wavelength of the transmitter used by the nth ONU for transmitting uplink data to the OLT For the λιιη, the OLT can send downlink data to all ONUs at the same time. Each ONU can also send uplink data at the same time. That is, the OLT and the ONU adopt a point-to-point structure on the optical channel.

In an OFDM-PON system, there are a plurality of different subcarriers at the OLT, each of which is CI, C 2, C n , and each subcarrier is orthogonal, and the OLT transmits downlink data to the first ONU. Modulating onto the first subcarrier (or modulating to the first subcarrier and other subcarriers), the OLT modulates the downlink data sent to the second ONU onto the second subcarrier (or modulates to the second subcarrier) And the other subcarriers, ..., the OLT modulates the downlink data sent to the nth ONU to the nth subcarrier (or to the nth subcarrier and other subcarriers), and sends the downlink data to the different ONUs. There is no intersection between the subcarriers used by the data, that is, different ONUs use different subcarriers, and the subcarriers used by the ONU to send uplink data to the OLT are the same as the subcarriers that the OLT uses to send downlink data to the current ONU. With the above technology, the OLT can send downlink data to all ONUs at the same time. Each ONU can also send uplink data at the same time. That is, the OLT and the ONU adopt a point-to-point structure on the optical channel.

The topology of the wavelength division time division hybrid PON system and the frequency division time division hybrid PON system are as shown in Fig. 3 (a) and Fig. 3 (b), each OLT manages a group of ONUs, and the wavelength division time division hybrid PON system The uplink wavelengths of the uplink data used by the group of ONUs are the same, and the downlink wavelengths of the downlink data are the same. The subcarriers or subcarrier groups used by the group of ONUs in the frequency division time-division hybrid PON system to transmit uplink data are the same. The subcarriers or the subcarrier groups that receive the downlink data are also the same. The different ONUs in the group of ONUs transmit the uplink data in a time division multiplexing manner. The downlink wavelengths (subcarriers or subcarrier groups) of different OLTs are different, and the uplink wavelengths (subcarriers or subcarrier groups) used by each group of ONUs managed by different OLTs are also different. When a part of the ONUs need a larger bandwidth, the OLT can command a part of the ONUs in the ONU group that includes the ONU to change the wavelength, subcarrier or subcarrier group that receives and sends data, thereby reducing the number of ONUs currently managed by the OLT, and improving the current OLT. The bandwidth that the ONU can get. In the above situation Each ONU can adjust the downlink wavelength (subcarrier or subcarrier group) for receiving the downlink signal and the uplink wavelength (subcarrier or subcarrier group) for transmitting the uplink data according to the command of the OLT, and the command at the OLT The uplink data is transmitted in a specific uplink time slot, but the method for bandwidth allocation of the above hybrid PON system is not proposed in the prior art. Summary of the invention

In view of this, the main object of the present invention is to provide a method and system for allocating uplink bandwidth in a passive optical network, which is used to solve the problem of bandwidth allocation of ONUs in a hybrid PON system.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

A method for allocating uplink bandwidth in a passive optical network, the method comprising:

The OLT transmits the bandwidth allocation information of the uplink bandwidth to the ONU through the bandwidth allocation channel, or the OLT transmits the bandwidth allocation information of the uplink bandwidth to the ONU through the management channel and the bandwidth allocation channel, where the bandwidth allocation information includes: physical channel information, data transmission time The management channel is configured to transmit physical channel information, where the bandwidth allocation channel is used to transmit uplink data transmission time information, when the bandwidth allocation information is transmitted by using the management channel and the bandwidth allocation channel;

The ONU sends the uplink data in the time indicated by the data transmission time information by using the physical channel indicated by the physical channel information according to the command sent by the OLT.

Further, the bandwidth allocation channel refers to an allocation structure in a downlink frame, and the bandwidth allocation information or uplink data transmission time information is encapsulated in the allocation structure.

Further, the management channel refers to: a physical layer operation management maintenance PLOAM message, an ONU management and control interface OMCI message, or an embedded operation maintenance management eOAM message.

Further, the physical channel information refers to wavelength channel information and/or subcarrier channel information. Further, the uplink data transmission time information includes: an OLT notifying the ONU of the start time and the end time of the uplink data, or the OLT notifying the ONU of the start time of the uplink data and the length of the transmission data.

Further, the bandwidth allocation information of the uplink bandwidth further includes OLT identity information; The ONU sends, according to the command sent by the OLT, the uplink data by using the physical channel indicated by the physical channel information in the time indicated by the data transmission time information, where the ONU determines, according to the OLT identity information, whether the OLT is managing itself. The OLT, if the ONU determines that the OLT is managing its own OLT and the bandwidth allocation information is allocated to itself, the ONU uses the physical channel indicated by the physical channel information to indicate the data transmission time information according to the command sent by the OLT. Send uplink data within the time.

Further, the bandwidth allocation information of the uplink bandwidth further includes ONU identity information; the ONU sends the uplink data in the time indicated by the data transmission time information by using the physical channel indicated by the physical channel information according to the command sent by the OLT. The ONU determines whether the bandwidth allocation information is allocated to itself according to the ONU identity information. When the ONU determines that the bandwidth allocation information is allocated to itself, the ONU adopts the physical channel information according to the command sent by the OLT. The indicated physical channel transmits uplink data within a time indicated by the data transmission time information.

Further, the bandwidth allocation information of the uplink bandwidth further includes OLT identity information and ONU identity information; the ONU uses the physical channel indicated by the physical channel information according to the command sent by the OLT at the time indicated by the data transmission time information. The sending of the uplink data includes: if the ONU determines, according to the identity information of the OLT and the ONU, that the bandwidth allocation information is allocated to the user, the ONU uses the physical channel indicated by the physical channel information in the data transmission according to the command sent by the OLT. The uplink data is sent within the time indicated by the time information.

Further, the physical channel is an uplink physical channel and/or a downlink physical channel.

The present invention also provides an uplink bandwidth allocation system in a passive optical network system, the system comprising:

The OLT is configured to pass the bandwidth allocation information of the uplink bandwidth to the ONU through the bandwidth allocation channel, or to transmit the bandwidth allocation information of the uplink bandwidth to the ONU through the management channel and the bandwidth allocation channel, where the bandwidth allocation information includes: physical channel information Data transmission time information; The management channel is configured to transmit physical channel information, where the bandwidth allocation channel is used to transmit uplink data transmission time information, where the bandwidth allocation information is transmitted by using the management channel and the bandwidth allocation channel;

The ONU is configured to send uplink data in the time indicated by the data transmission time information by using a physical channel indicated by the physical channel information according to the command sent by the OLT.

Further, the bandwidth allocation channel refers to an allocation structure in a downlink frame, and the bandwidth allocation information or uplink data transmission time information is encapsulated in the allocation structure;

The management channel refers to a physical layer operation management and maintenance PLOAM message, an ONU management and control interface OMCI message, or an embedded operation maintenance management eOAM message.

Further, the physical channel information refers to wavelength channel information and/or subcarrier channel information; the uplink data transmission time information includes: an OLT notifies the ONU of the start time and end time of transmitting the uplink data, or the OLT notifies the ONU to transmit the uplink. The start time of the data and the length of the transmitted data.

Further, the bandwidth allocation information of the uplink bandwidth further includes OLT identity information and/or ONU identity information. The ONU is configured to: determine, according to the OLT identity information, whether the OLT is an OLT that manages its own, or an ONU. Determining, according to the ONU identity information, whether the bandwidth allocation information is bandwidth allocation information allocated to itself, or the ONU determining, according to the identity information of the OLT and the ONU, whether the bandwidth allocation information is bandwidth allocation information allocated to itself; The OLT is an OLT that manages its own, and the bandwidth allocation information is bandwidth allocation information allocated to itself, and the physical channel indicated by the physical channel information is indicated by the data transmission time information according to the command sent by the OLT. Send uplink data in time.

By using the ONU uplink bandwidth of the present invention, the OLT can allocate bandwidth on the physical channel and the time channel to the ONU, and the resources of the uplink physical channel and the time channel can be shared between the ONUs, thereby improving the uplink transmission efficiency of the ONU. . DRAWINGS

Figure 1 is a topological structural diagram of a GPON system; 2 is a structural diagram of a US BWma in a downlink frame of a GPON;

3 is a topological structural diagram of a hybrid PON according to an embodiment of the present invention;

4 is a schematic diagram of bandwidth allocation allocated by an OLT to an ONU according to Embodiment 1 of the present invention;

FIG. 5 is a schematic diagram of bandwidth allocation allocated by an OLT to an ONU according to Embodiment 1 of the present invention; FIG.

6 is a schematic diagram of bandwidth allocation allocated by an OLT to an ONU according to Embodiment 1 of the present invention;

FIG. 7 is a schematic diagram of bandwidth allocation allocated by an OLT to an ONU according to Embodiment 1 of the present invention; FIG.

FIG. 8 is a schematic diagram of bandwidth allocation allocated by an OLT to an ONU according to Embodiment 2 of the present invention; FIG.

FIG. 9 is a schematic diagram of bandwidth allocation allocated by an OLT to an ONU according to Embodiment 2 of the present invention; FIG.

FIG. 10 is a schematic diagram of bandwidth allocation allocated by an OLT to an ONU according to Embodiment 2 of the present invention; FIG.

FIG. 11 is a schematic diagram of bandwidth allocation allocated by an OLT to an ONU according to Embodiment 2 of the present invention; FIG.

FIG. 12 is a schematic diagram of bandwidth allocation allocated by an OLT to an ONU according to Embodiment 3/4 of the present invention; FIG.

FIG. 13 is a schematic diagram of bandwidth allocation allocated by an OLT to an ONU according to Embodiment 3/4 of the present invention; FIG.

FIG. 14 is a schematic diagram of bandwidth allocation allocated by an OLT to an ONU according to Embodiment 3/4 of the present invention; FIG.

FIG. 15 is a schematic diagram of bandwidth allocation allocated by an OLT to an ONU according to Embodiment 3/4 of the present invention. Intention

FIG. 16 is a schematic diagram of bandwidth allocation allocated by an OLT to an ONU according to Embodiment 5 of the present invention. detailed description

The present invention will be further described in detail below with reference to the accompanying drawings. The embodiments of the present application and the features of the embodiments may be combined with each other without conflict.

Example 1

In this embodiment, the allocated wavelength information and the time slot information are encapsulated in the Allocation structure, and the topology of the wavelength division time division hybrid PON system is as shown in FIG. 3a or FIG. 3b. The OLT and the ONU use the following steps to complete the uplink bandwidth allocation. :

Step 1: The allocation structure of the OLT to the ONU includes several field information as shown in FIG. 4, where:

The OLT identity information field is used to carry the identity information of the OLT, including one or any combination of the following: the country where the OLT is located (Country), the city where the OLT is located (City), the OLT identification information (OLT-ID), and the slot identification of the OLT. Information (Slot-ID), port identification information (Port-ID) at which the OLT is currently working, and transmitted optical power information (Power) of the OLT. The role of the OLT identity information is that the ONU identifies whether the OLT is managing its own OLT according to the identity information of the OLT;

The ONU identity information field is used to carry the identity information of the ONU. The ONU identity information may be the identity information of the ONU, such as the ONU identity information or the logical link identifier of the ONU. The ONU identity information may also be the identity information carried by the ONU itself. The serial number of the ONU or the medium access control address of the ONU. The ONU determines whether the bandwidth allocation is allocated to itself by using the ONU identity information, and the ONU may also determine whether the bandwidth allocation is allocated to itself by using the OLT identity information and the ONU identity information;

The wavelength channel information field is used to carry the OLT to the ONU for sending uplink data. The wavelength of the line, or the uplink wavelength used by the OLT to allocate the uplink data to the ONU and the downlink wavelength used to receive the downlink data;

The start time field is used to carry the time that the OLT allocates to the ONU to start sending uplink data; the grant size field is used to carry the length that the OLT allocates to the ONU to send uplink data.

Step 2: After receiving the bandwidth allocation information shown in FIG. 4 sent by the OLT in step 1, the ONU determines whether the bandwidth allocation is allocated to itself according to the ONU identity information or the ONU according to the OLT identity information and the ONU identity information. The bandwidth allocation is allocated to itself, and the ONU starts to send uplink data at the start time by using the wavelength specified in the bandwidth allocation, and the length of the sent data is the data length specified by the grant size (if the wavelength channel information is carried The OLT allocates the uplink wavelength for the uplink data and the downlink wavelength for receiving the downlink data, and the ONU starts to send the uplink data at the start time by using the wavelength specified in the bandwidth allocation, and the length of the sent data is the grant size. The specified data length, and begins to use the downstream wavelength carried by the wavelength channel to receive downlink data).

In this embodiment, the OLT allocates the start time of the uplink data and the length of the transmitted data to the ONU, that is, the size of the grant. In other embodiments, the OLT can also be used to send the ONU shown in FIG. 5 to the ONU. The parameter of the time when the uplink data is sent, that is, the start time and the time when the ONU ends the time for transmitting the uplink data, is the end time. In this embodiment, the uplink bandwidth allocated by the OLT to the ONU includes the identity information of the OLT, in other embodiments. In the uplink bandwidth sent by the OLT to the ONU, the identity information of the OLT may not be included, as shown in FIG. 6 and FIG. 7. At this time, the ONU includes the identity information of the OLT and the OLT according to other parts of the downlink data sent by the OLT. The identity information of the ONU included in the bandwidth allocation allocated to the ONU determines whether the bandwidth allocation is allocated to itself, or the ONU determines whether the bandwidth allocation is an allocation according to the identity information of the ONU included in the bandwidth allocation allocated by the OLT to the ONU. Give it to yourself.

In other embodiments, the uplink bandwidth allocated by the OLT to the ONU includes, in addition to the foregoing information, whether the upstream data of the ONU is required to include forward error correction (Forward error). Correction, FEC) check data, if the OLT requires the uplink data of the ONU to carry the FEC check bit information, the ONU performs FEC calculation on the sent uplink data, and carries the FEC check bit information in the uplink data. Otherwise, the ONU FEC calculation is not performed on the transmitted uplink data.

In this embodiment, different ONUs in a group of ONUs managed by one OLT transmit the same uplink wavelengths, and different ONUs transmit uplink data in a time division multiplexing manner, and the method of the present invention can also be applied to an ONU exclusive uplink channel. In the case, or different ONUs managed by one OLT use different wavelengths to transmit uplink data, different ONUs can simultaneously send uplink data. In the above case, the start time, end time and grant size in FIG. 4 to FIG. 7 can be For a specific value, after receiving the bandwidth allocation information, the ONU may ignore the start time, the end time, and the value of the grant size, or after the ONU receives the bandwidth allocation information, the ONU confirms that the OLT allocates the entire uplink time slot according to the specific value. After transmitting the uplink data to the ONU, the ONU can select to send the uplink data in the entire uplink time slot according to the local situation.

Example 2

In this embodiment, the allocated subcarrier information and the time slot information are encapsulated in the Allocation structure, and the topology of the frequency division time division hybrid PON system is as shown in FIG. 3a or FIG. 3b, and the OLT and the ONU use the following steps to complete the uplink bandwidth allocation. :

Step 1: The OLT allocates the bandwidth allocation shown in Figure 8 to the ONU, where:

The OLT identity information is used to carry the identity information of the OLT, including one or any combination of the following: the country where the OLT is located, the city where the OLT is located, the OLT-ID, the Slot-ID of the OLT, the Port-ID where the OLT is currently working, and the OLT transmission. Optical power information. The role of the OLT identity information is that the ONU identifies whether the OLT is managing its own OLT according to the identity information of the OLT;

The ONU identity information may be the identity information of the ONU, such as the ONU identity information or the logical link identifier of the ONU. The ONU identity information may also be the identity information carried by the ONU itself, such as the serial number of the ONU or the media access control address of the ONU. , ONU through The ONU identity information determines whether the bandwidth allocation is allocated to itself. The ONU may also determine whether the bandwidth allocation is allocated to itself by using the OLT identity information and the ONU identity information; the subcarrier channel information carries the OLT assigned to the ONU. a subcarrier for transmitting uplink data and for receiving downlink data;

The start time is the time when the OLT allocates the uplink data to the ONU to start sending the uplink data. Step 2: After the ONU receives the bandwidth allocation information shown in Figure 8 sent by the OLT in step 1, the ONU according to the ONU identity information or the ONU according to the OLT identity information and the ONU identity The information is used to determine whether the bandwidth allocation information is allocated to itself. If the bandwidth allocation information is allocated to itself, the ONU starts to send uplink data and send data at the start time by using the subcarrier specified in the bandwidth allocation. The length is the data length specified by the grant size, and the downlink data is received using the subcarriers.

In this embodiment, the OLT allocates the start time of the uplink data and the length of the transmitted data to the ONU, that is, the size of the grant. In other embodiments, the OLT may also be used to send the ONU shown in FIG. 9 to the ONU. The parameter start time of the time when the uplink data is sent and the parameter end time of the time when the ONU ends the transmission of the uplink data. In this embodiment, the uplink bandwidth allocated by the OLT to the ONU includes the identity information of the OLT. In other embodiments, The OLT can also use the OLT to send the identity information of the OLT to the ONU. As shown in Figure 10 and Figure 11, the ONU then sends the identity information of the OLT and the OLT to the ONU according to other parts of the downlink data sent by the OLT. The identity information of the ONU included in the allocated bandwidth allocation determines whether the bandwidth allocation is allocated to itself, or the ONU determines whether the bandwidth allocation is assigned to itself according to the identity information of the ONU included in the bandwidth allocation allocated by the OLT to the ONU. of.

In other embodiments, the uplink bandwidth allocated by the OLT to the ONU includes, in addition to the foregoing information, whether the uplink data of the ONU is required to include the check data of the FEC, and the OLT requires the uplink data of the ONU to carry the FEC check bit information. , the ONU enters the uplink data sent The FEC operation is performed, and the FEC check bit information is carried in the uplink data. Otherwise, the ONU does not perform the FEC operation on the sent uplink data.

In this embodiment, the different ONUs in a group of ONUs managed by one OLT are the same, and the different ONUs transmit uplink data in a time division multiplexing manner. The method of the present invention can also be applied to an ONU exclusive uplink. In the case of a channel, or different ONUs managed by one OLT use different subcarriers to transmit uplink data. At this time, different ONUs can simultaneously send uplink data. In the above case, the start time, end time, and grant in FIG. 8 to FIG. The size can be a specific value. After receiving the bandwidth allocation, the ONU can ignore the start time, the end time, and the value of the grant size. After the ONU receives the bandwidth allocation, the ONU confirms that the OLT allocates the entire uplink time slot according to the specific value. After transmitting the uplink data to the ONU, the ONU can select to send the uplink data in the entire uplink time slot according to the local situation.

Example 3

The wavelength information allocated in this embodiment is managed by the Physical Layer Operations (Administration and Maintenance, PLOAM) message, the ONU Management and Control Interface (OMCI) message, or the embedded operation maintenance management eOAM message. The transmission, the time slot information is encapsulated in the Allocation structure; the topology of the wavelength division time division hybrid PON system is shown in Figure 3a or Figure 3b, and the OLT and the ONU use the following steps to complete the uplink bandwidth allocation:

Step 1: The OLT sends the physical layer operation management and maintenance PLOAM message shown in Table 1 to an ONU. As shown in Table 1, the first to second bytes of the ONU wavelength ( Assign_ONU_Wavelength) message are assigned to the ONU-ID (here The ONU-ID is only an example of the ONU identification information. In other embodiments, the logical link identifier information of the ONU, the ONU medium access control address information, the ONU serial number information, or other ONU identifier information may be used. The value indicates that the message is sent to the ONU whose ONU-ID value is ONU-ID1; the content of the third byte indicates that the type of the PLOAM message is the structure information type of the Assign_ONU_Wavdength message; The four bytes are the serial number of the PLOAM message; the fifth to fortieth bytes are the upstream wavelength values assigned by the OLT to the ONU (in other embodiments, the fifth to fortieth bytes of content are OLT) The uplink wavelength value and the downlink wavelength value assigned to the ONU, and the forty-first byte to the forty-eighth byte are the message insurance code of the message integrity check. The OLT commands the mth ONU to adjust the illumination wavelength of its own laser to the upstream wavelength allocated by the OLT to the ONU through the Assign_ONU_Wavdength message (in other embodiments, the OLT commands the mth ONU to transmit the wavelength of its own laser through the Assign_ONU_Wavelength message. Adjust the upstream wavelength assigned to the ONU by the OLT, and adjust the receiving wavelength of its own receiver to the downstream wavelength assigned by the OLT to the ONU.

Step 2: After receiving the Assign_ONU_Wavelength message sent by the OLT, the corresponding ONU adjusts the illuminating wavelength of the laser to the upstream wavelength allocated by the OLT in the Assign_ONU_Wavelength message (in other embodiments, after the ONU receives the Assign_ONU_Wavelength message sent by the OLT, The illuminating wavelength of the own laser is adjusted to the upstream wavelength allocated by the OLT in the Assign_ONU_Wavelength message, and the receiving wavelength of the own receiver is adjusted to the downstream wavelength allocated by the OLT to the ONU.

Table 1

Step 3: The OLT allocates the bandwidth allocation shown in Figure 12 to the ONU, where the OLT identity information Identity information for carrying the OLT, including one or any combination of the following: the country where the OLT is located, the city where the OLT is located, the OLT-ID, the Slot-ID of the OLT, the Port-ID where the OLT is currently working, and the transmitted optical power information of the OLT. The role of the OLT identity information is that the ONU identifies whether the OLT is the OLT that manages the OLT according to the identity information of the OLT. The identity information of the ONU may be the identity information of the ONU, such as the ONU identifier information or the logical link identifier of the ONU, and the ONU identity information. The ONU may also carry the identity information carried by the ONU, for example, the serial number of the ONU or the medium access control address of the ONU. The ONU determines whether the bandwidth allocation is allocated to itself by using the ONU identity information, and the ONU may also pass the OLT identity information and The ONU identity information determines whether the bandwidth allocation is assigned to itself; the start time is that the OLT allocates to the ONU to start transmitting. Step 4: After the ONU receives the bandwidth allocation shown in FIG. 12 sent by the OLT in step 3, the ONU according to the ONU identity information Or the ONU determines, according to the OLT identity information and the ONU identity information, whether the bandwidth allocation is allocated to itself, if the bandwidth allocation is an allocation. For the self, the ONU starts to send the uplink data at the start time in step 3 by using the wavelength specified in step 1. The length of the transmitted data is the data length specified by the grant size (if the wavelength channel information carries the OLT assigned to The ONU is configured to send the uplink wavelength of the uplink data and the downlink wavelength for receiving the downlink data, and the ONU starts to send the uplink data at the start time by using the wavelength specified in the bandwidth allocation, and the length of the sent data is the data specified by the grant size. Length, and start to use the downlink wavelength carried by the wavelength channel to receive downlink data).

In this embodiment, the OLT allocates wavelength information to the ONU through the PLOAM message shown in Table 1. In other embodiments, the OLT may also use the OLT to allocate wavelength information to the ONU through an OMCI message, an embedded OAM message, or other wavelength assignment message.

In this embodiment, the OLT allocates the start time of the uplink data and the length of the transmitted data to the ONU, that is, the size of the grant. In other embodiments, the OLT may also be used to send the ONU shown in FIG. 13 to the ONU. Parameter start time and ONU junction of the time when the uplink data is sent The parameter end time of the time when the bundle sends the uplink data. In this embodiment, the uplink bandwidth allocated by the OLT to the ONU includes the identity information of the OLT. In other embodiments, the uplink bandwidth sent by the OLT to the ONU may also be used. Excluding the identity information of the OLT, as shown in FIG. 14 and FIG. 15, the ONU then uses the identity information of the OLT included in other parts of the downlink data sent by the OLT and the identity information of the ONU included in the bandwidth allocation allocated by the OLT to the ONU. It is determined whether the bandwidth allocation is allocated to itself, or the ONU determines whether the bandwidth allocation is allocated to itself according to the identity information of the ONU included in the bandwidth allocation allocated by the OLT to the ONU.

In other embodiments, the uplink bandwidth allocated by the OLT to the ONU includes, in addition to the foregoing information, whether the uplink data of the ONU is required to include the check data of the FEC, and the OLT requires the uplink data of the ONU to carry the FEC check bit information. Then, the ONU performs FEC calculation on the sent uplink data, and carries the FEC check bit information in the uplink data. Otherwise, the ONU does not perform FEC calculation on the sent uplink data.

In this embodiment, different ONUs in a group of ONUs managed by one OLT transmit the same uplink wavelengths, and different ONUs transmit uplink data in a time division multiplexing manner, and the method of the present invention can also be applied to an ONU exclusive uplink channel. In the case, or different ONUs managed by one OLT use different wavelengths to transmit uplink data, different ONUs can simultaneously send uplink data. In the above case, the start time, end time and grant size in FIG. 12 to FIG. 15 can be For a specific value, after the ONU receives the above bandwidth allocation, the value of the start time, the end time, and the grant size may be ignored, or after the ONU receives the bandwidth allocation, the ONU confirms that the OLT allocates the entire uplink time slot to itself according to the specific value. After the uplink data is transmitted, the ONU can select to send the uplink data in the entire uplink time slot according to the local situation.

In this embodiment, the OLT allocates wavelength information to the ONU through a PLOAM message, an OMCI message, an embedded OAM message, or other wavelength assignment message, and the identity information of the OLT is sent to the ONU through the uplink bandwidth allocation. In other embodiments, the OLT may also be used. Assigning an ONU to a PLOAM message, an OMCI message, an embedded OAM message, or other wavelength assignment message The wavelength information of the ONU and the identity information of the OLT.

Example 4

In this embodiment, the allocated wavelength information is sent by using a PLOAM message, an OMCI message or an embedded OAM message, and the time slot information is encapsulated in the Allocation structure. The topology structure of the frequency division time division hybrid PON system is as shown in FIG. 3a or FIG. 3b. The OLT and the ONU use the following steps to complete the uplink bandwidth allocation:

Step 1: The OLT sends the PLOAM message shown in Table 2 to an ONU. As shown in Table 2, the first to second bytes of the Assign_ONU_Subcarrier message are ONU-IDs (where the ONU-ID is only one of the ONU identification information). For example, in other embodiments, the value of the logical link identifier information of the ONU, the ONU medium access control address information, the ONU sequence number information, or other ONU identifier information may be used to indicate that the message is sent to the ONU. The ONU whose ID value is ONU-ID1; the content of the third byte indicates that the type of the PLOAM message is the structure information type of the Assign_ONU_Subcarrier message; the fourth byte is the sequence number of the PLOAM message; the fifth to the fortieth byte The content is the subcarrier allocated to the ONU by the OLT; the forty-first byte to the forty-eighth byte is the message verification code of the message integrity check. The OLT commands the mth ONU to adjust its own transmit uplink data and subcarriers that receive downlink data to the above subcarriers through the Assign_ONU_Subcarrier message.

Step 2: After receiving the Assign_ONU_Subcarrier message sent by the OLT, the corresponding ONU adjusts the subcarriers that send the uplink data and receive the downlink data to the subcarriers allocated by the OLT in the Assign_ONU_Subcarrier message.

Assign_ONU_Subcarrier message

Byte Content Description

1-2 ONU-ID 1 The content of this byte is ONU-ID 1 , indicating the cancellation.

The information is sent to the ONU-ID value of ONU-ID 1.

ONU

3 XXXXXXXX message type is defined

"Assign_ONU_Subcarrier" 4 SeqNo PLOAM message serial number

5-40 Data Data Field (Data) Content Assigned by OLT

ONU subcarrier

41-48 MIC Message Integrity Check

Table 2

Step 3: The OLT allocates the bandwidth allocation shown in Figure 12 to the ONU. The OLT identity information is used to carry the identity information of the OLT, including one or any combination of the following: the country where the OLT is located, the city where the OLT is located, the OLT-ID, and the OLT. The Slot-ID, the Port-ID that the OLT is working now, and the transmitted optical power information of the OLT. The role of the OLT identity information is that the ONU identifies whether the OLT is managing its own OLT according to the identity information of the OLT; the ONU identity information may be an OLT assigned ONU. The identity information, such as the ONU identifier information or the logical link identifier of the ONU, the ONU identity information may also be the identity information carried by the ONU itself, such as the serial number of the ONU or the medium access control address of the ONU, and the ONU judges by using the ONU identity information. Whether the bandwidth allocation is allocated to itself, the ONU may also determine whether the bandwidth allocation is assigned to itself by using the OLT identity information and the ONU identity information; the start time is allocated by the OLT to the ONU to start sending.

Step 4: After receiving the bandwidth allocation information shown in FIG. 12 sent by the OLT in step 3, the ONU determines whether the bandwidth allocation information is allocated to itself according to the ONU identity information or the ONU according to the OLT identity information and the ONU identity information. If the bandwidth allocation information is allocated to itself, the ONU starts to send uplink data by using the subcarrier specified in step 1 at the start time in step 3, and the length of the transmission data is the data length specified by the grant size.

In this embodiment, the OLT allocates subcarrier information to the ONU through the PLOAM message shown in Table 2. In other embodiments, the OLT may also use the OLT to allocate the message to the ONU through an OMCI message, an embedded OAM message, or other subcarrier allocation message. Carrier information.

In this embodiment, the OLT allocates a value of the start time of transmitting the uplink data and the length of the transmitted data to the ONU, that is, the grant size. In other embodiments, the OLT may also be used for the ONU. The parameter start time of the time when the ONU starts transmitting the uplink data and the parameter end time of the time when the ONU ends the transmission of the uplink data is sent. In this embodiment, the uplink bandwidth allocated by the OLT to the ONU includes the identity information of the OLT. In other embodiments, the OLT sends the identity information of the OLT to the ONU without including the identity information of the OLT, as shown in FIG. 14 and FIG. 15 , where the ONU is included according to other parts of the downlink data sent by the OLT. The identity information of the OLT and the identity information of the ONU included in the bandwidth allocation allocated by the OLT to the ONU determine whether the bandwidth allocation is allocated to itself, or the ONU determines the identity information of the ONU included in the bandwidth allocation allocated by the OLT to the ONU. Whether the bandwidth allocation is assigned to itself.

In other embodiments, the uplink bandwidth allocated by the OLT to the ONU may include, in addition to the foregoing information, whether the uplink data of the ONU is required to include the verification data of the forward error correction FEC, and if the OLT requires the uplink data of the ONU to carry the FEC. If the check bit information is used, the ONU performs FEC calculation on the sent uplink data, and carries the FEC check bit information in the uplink data. Otherwise, the ONU does not perform FEC calculation on the sent uplink data.

In this embodiment, the sub-carriers of the different ONUs that are sent by the OLT are the same, and the different ONUs transmit the uplink data according to the time division multiplexing manner. The method of the present invention may also be applied to the case where an ONU monopolizes the uplink channel, or Different ONUs managed by one OLT use different subcarriers to transmit uplink data. In this case, different ONUs can simultaneously send uplink data. In the above case, the start time, end time and grant size in FIG. 12 to FIG. 15 can be specific. The ONU can ignore the start time, the end time, and the grant size after receiving the bandwidth allocation. After the ONU receives the bandwidth allocation, the ONU confirms that the OLT allocates the entire uplink time slot to transmit uplink data according to the specific value. After the ONU obtains the above information, the ONU may select to send uplink data in the entire uplink time slot according to local conditions.

In this embodiment, the OLT allocates the subcarrier information to the ONU through the PLOAM message, the OMCI message, the embedded OAM message, or other subcarrier allocation message, and the identity information of the OLT is sent to the ONU through the uplink bandwidth allocation. In other embodiments, the OLT may also Adopt OLT through PLOAM The message, the OMCI message, the embedded OAM message or other subcarrier allocation message conveys to the ONU the subcarrier information assigned to the ONU and the identity information of the OLT.

Example 5

In this embodiment, the allocated wavelength information and the time slot information are encapsulated in the Allocation structure of the XGPON1, and an Alloacation Structure of a specific value T-CONT is added to the Allocation structure, and the Allocation structure is used for the assignment. The wavelength information of the ONU of the Allocation structure and the OLT identity information, or the wavelength information of the ONU;

The topology of the wavelength division time-division hybrid PON system is shown in Figure 3a or Figure 3b. The OLT and ONU use the following steps to complete the uplink bandwidth allocation:

Step 1: The OLT allocates the bandwidth allocation shown in Figure 16 to the ONU. The bandwidth allocation domain consists of N Allocation Structures. The partial allocation structure consists of the Alloc-ID domain (Allocation Identifier, bandwidth allocation identifier, generally T-CONT identifier), Flags. Domain (bandwidth allocation option, 2 bits, one bit is used to indicate whether the ONU sends an uplink dynamic bandwidth report (DBRu), and another bit is used to indicate whether the ONU sends an uplink physical layer operation, management and maintenance (PLOAMu) message. ), Start Time (Start Time, indicating the position of the first byte of the XG-PON transmission convergence burst (XGTC burst) sent by the ONU in the 125us upstream frame), grant size ( Grant

(FWI), burst overhead parameter (Bprofile) and mixed error correction (HEC); part of the allocation structure includes some or all of the following: Alloc-ID domain (Allocation Identifier, bandwidth allocation identifier, generally transmission container, Transmission Container, T-CONT, where the value of Alloc-ID is a specific value, such as 0x3FFF), OLT identity information, wavelength channel information, and HEC. The OLT identity information is used to carry the identity information of the OLT, including one or any combination of the following: the country where the OLT is located, the city where the OLT is located, the OLT-ID, the Slot-ID of the OLT, the Port-ID where the OLT is currently working, and the OLT. Transmit optical power information, the role of OLT identity information is ONU The OLT is configured to identify the OLT according to the identity information of the OLT; the wavelength channel information carries the uplink wavelength that the OLT allocates to the ONU for transmitting the uplink data (or the wavelength channel information is carried by the OLT to the ONU for sending the uplink data). Upstream wavelength and downstream wavelength used to receive downlink data).

Step 2: After the ONU receives the bandwidth allocation shown in Figure 16 sent by the OLT in step 1, if the ONU determines that the Allocation structure is assigned to itself according to the Alloc-ID, the ONU performs HEC on the data in the received Allocation structure. If the check result is correct, the ONU obtains the start time of sending the uplink data and the grant length of the sent data. The ONU continues to parse the next Allocation structure. If the value of the Alloc-ID of the next Allocation structure is 0x3FFF, the ONU determines the The Allocation structure is assigned to the OLT by the OLT. The ONU performs the HEC check on the data in the received Allocation structure. If the check result is correct, the ONU obtains the wavelength value of the uplink data sent by the OLT to the user, and combines the two Allocations. The content of the structure, the ONU will use the allocated uplink wavelength to start transmitting the data in the T-CONT whose bandwidth allocation identifier is Alloc-ID at the StartTime indicated by the Allocation structure, and the length of the transmitted data is the ONU parsed according to the content carried in the Grant size field. The length of data that the ONU can send ( In other embodiments, the wavelength channel information carries an uplink wavelength allocated by the OLT to the ONU for transmitting uplink data and a downlink wavelength used for receiving downlink data, and the ONU adopts the wavelength specified in the bandwidth allocation. The start time starts to send the uplink data, the length of the sent data is the data length specified by the grant size, and the downlink data received by the wavelength channel is used to receive the downlink data.

In this embodiment, the uplink bandwidth allocated by the OLT to the ONU includes the identity information of the OLT. In other embodiments, the uplink bandwidth sent by the OLT to the ONU may include not only the identity information of the OLT but also the ONU. Identity Information.

In this embodiment, different ONUs in a group of ONUs managed by one OLT transmit the same uplink wavelength, and different ONUs transmit uplink data in a time division multiplexing manner, and the present invention The method can also be applied to the case where a 0NU exclusive uplink channel is used, or a different ONU managed by the 0LT transmits uplink data by using different wavelengths, and different ONUs can simultaneously send uplink data. In the above case, the start in this embodiment The time, the end time, and the grant size may be a specific value. After the ONU receives the above bandwidth allocation, the start time, the end time, and the grant size may be ignored. After the ONU receives the bandwidth allocation, the ONU confirms the OLT according to the specific value. The entire uplink time slot is allocated to itself to transmit uplink data. After the ONU obtains the above information, the ONU may select to send uplink data in the entire uplink time slot according to local conditions.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

A method for allocating an uplink bandwidth in a passive optical network system, characterized in that the optical line terminal OLT transmits the bandwidth allocation information of the uplink bandwidth to the optical network unit ONU through the bandwidth allocation channel, or the OLT passes the management channel and the bandwidth allocation. The channel transmits the bandwidth allocation information of the uplink bandwidth to the ONU, where the bandwidth allocation information includes: physical channel information and data transmission time information; when the bandwidth allocation information is transmitted by using the management channel and the bandwidth allocation channel, the management channel is used to transfer the physical Channel information, the bandwidth allocation channel is used to transmit uplink data transmission time information;

The method according to claim 1, wherein the bandwidth allocation channel refers to an allocation structure in a downlink frame, and the bandwidth allocation information or uplink data transmission time information is encapsulated in the allocation structure.

The method according to claim 1, wherein the management channel refers to: a physical layer operation management and maintenance PLOAM message, an ONU management and control interface OMCI message or an embedded operation and maintenance management eOAM message.

4. The method according to claim 1, wherein the physical channel information refers to wavelength channel information and/or subcarrier channel information.

The method according to claim 1, wherein the uplink data transmission time information comprises: an OLT notifying the ONU of the start time and the end time of transmitting the uplink data, or the OLT notifying the ONU of the start time and the transmission of the uplink data. The length of the data.

The method according to claim 1, wherein the bandwidth allocation information of the uplink bandwidth further includes OLT identity information;

The ONU sends the uplink data in the time indicated by the data transmission time information by using the physical channel indicated by the physical channel information according to the command sent by the OLT, including: The OLT identity information determines whether the OLT is managing its own OLT. If the ONU determines that the OLT is managing its own OLT and the bandwidth allocation information is allocated to itself, the ONU adopts the physical channel according to a command sent by the OLT. The physical channel indicated by the information transmits the uplink data within the time indicated by the data transmission time information.

The method according to claim 1, wherein the bandwidth allocation information of the uplink bandwidth further includes ONU identity information;

And the ONU sends, according to the command sent by the OLT, the uplink data by using the physical channel indicated by the physical channel information in the time indicated by the data transmission time information, where: the ONU determines, according to the ONU identity information, whether the bandwidth allocation information is The ONU determines that the bandwidth allocation information is allocated to itself, and the ONU sends the uplink data in the time indicated by the data transmission time information by using the physical channel indicated by the physical channel information according to the command sent by the OLT. .

The method according to claim 1, wherein the bandwidth allocation information of the uplink bandwidth further includes OLT identity information and ONU identity information;

The ONU sends the uplink data in the time indicated by the data transmission time information by using the physical channel indicated by the physical channel information according to the command sent by the OLT, including: if the ONU determines the bandwidth allocation information according to the identity information of the OLT and the ONU. If it is allocated to itself, the ONU sends the uplink data in the time indicated by the data transmission time information by using the physical channel indicated by the physical channel information according to the command sent by the OLT.

9. The method according to claim 1, wherein the physical channel is an uplink physical channel and/or a downlink physical channel.

10. An uplink bandwidth allocation system in a passive optical network system, wherein the system comprises:

The optical line terminal OLT is configured to transmit the bandwidth allocation information of the uplink bandwidth to the optical network unit ONU through the bandwidth allocation channel, or to use the management channel and the bandwidth allocation channel to increase the uplink bandwidth. The bandwidth allocation information is transmitted to the ONU, and the bandwidth allocation information includes: physical channel information and data transmission time information. In the case of using the management channel and the bandwidth allocation channel to transmit bandwidth allocation information, the management channel is used to transmit physical channel information. The bandwidth allocation channel is configured to transmit uplink data transmission time information;

The optical network unit ONU is configured to send the uplink data in the time indicated by the data transmission time information by using the physical channel indicated by the physical channel information according to the command sent by the OLT.

The system according to claim 10, wherein the bandwidth allocation channel refers to an allocation structure in a downlink frame, and the bandwidth allocation information or uplink data transmission time information is encapsulated in the allocation structure;

The system according to claim 10, wherein the physical channel information refers to wavelength channel information and/or subcarrier channel information; and the uplink data transmission time information includes: the OLT notifies the ONU to transmit uplink data. The start time and the end time, or the OLT informs the ONU of the start time of transmitting uplink data and the length of the transmitted data.

The system according to claim 10, wherein the bandwidth allocation information of the uplink bandwidth further comprises OLT identity information and/or ONU identity information;

The ONU is configured to: determine, according to the OLT identity information, whether the OLT is to manage its own OLT, or determine, according to the ONU identity information, whether the bandwidth allocation information is bandwidth allocation information allocated to itself, or according to an OLT And determining, by the identity information of the ONU, whether the bandwidth allocation information is bandwidth allocation information allocated to itself; when determining that the OLT is managing its own OLT, and the bandwidth allocation information is bandwidth allocation information allocated to itself, The command sent by the OLT sends the uplink data in the time indicated by the data transmission time information by using the physical channel indicated by the physical channel information.