CN106412726B - Method and device for supporting communication between base stations in PON system - Google Patents
Method and device for supporting communication between base stations in PON system Download PDFInfo
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Abstract
The invention provides a method and a device for supporting direct communication between base stations in a PON system, wherein an ONU receives interactive data between base stations from a source base station associated with the ONU and destined for a target base station, encapsulates the interactive data between the base stations into an uplink PON data frame, marks ONU information associated with the target base station and corresponding communication wavelength configuration in a frame header, and then sends the uplink PON data frame to an OLT; the OLT receives and analyzes whether the frame header of the uplink PON data frame contains ONU information and corresponding communication wavelength configuration information so as to judge whether the uplink PON data frame is interactive data between wireless network base stations; and when the data interaction between the wireless network base stations is determined, the OLT creates a downlink PON data frame according to the ONU information and the corresponding communication wavelength configuration information and sends the downlink PON data frame to a target ONU in the PON system. The invention makes it possible to perform eNB intercommunication based on two-layer mode between a plurality of different wavelength channels in PON system based on wavelength division multiplexing mode.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for supporting communication between wireless base stations in a Passive Optical Network (PON) system.
Background
LTE (long term evolution) or E-UTRAN (evolved universal terrestrial radio access network) technology, which is capable of significantly increasing system capacity and increasing transmission rate, is considered as a mainstream wireless technology solution following 3G. Fig. 1 shows the overall LTE network architecture defined by the 3GPP forum, in which the LTE bearer network mainly solves the bearer problem of S1 and X2 interfaces between the radio base station eNB and the LTE EPC (MME/S-GW), and the S1 interface between the eNB and the MME/SGW divides the SAE/LTE evolved system into a radio access network and a core network. The idea of bearer and control separation is followed, and the S1 interface is also divided into a user plane and a control plane. Wherein the user plane interface S1-U connects the eNB and SGW for transferring user data and corresponding user plane control frames. And the control plane interface S1-MME connects the eNB and the MME to mainly complete the functions of radio access bearer control, interface-dedicated operation and maintenance and the like of the S1 interface. The eNBs are connected with each other through an X2 interface and are used for supporting direct transmission of data and signaling between the e-NodeBs. Since LTE is an all-IP network, each eNB is considered as a physical communication unit with a specific IP address, and therefore, the traffic of the X2 interface needs to be routed and forwarded by means of IP addressing at layer 3.
The rapidly growing wireless traffic has saturated existing backhaul networks based on dedicated links to implement X2 interfacing, which makes it a necessary choice sooner or later to use some form of optical fiber connection for the radio base station eNB. Compared with the method of laying a special point-to-point optical fiber to connect the base stations, the method of implementing the wireless backhaul in the point-to-multipoint structure of the PON (passive optical network) as shown in fig. 2 is much cheaper in cost, and simultaneously maintains the security, the scalability, and the future-oriented evolvable property of the PON network, and thus has drawn much attention. In addition, the PON network can simultaneously bear the user residence service and the wireless backhaul service, thereby providing remarkable cooperativity, bringing economic balance to wireless and fixed network operators/service providers and being beneficial to terminal users. The standardization organization BBF (broadband forum) is writing a technical draft to specify the architecture and technical requirements of PON-based wireless backhaul networks.
As users demand bandwidth, a PON network system based on wavelength division multiplexing WDM is one of the hot alternatives of the next-generation FTTx optical access technology, in which TWDM-PON is selected as the preferred scheme of the next-generation PON (NG-PON2), and WDM-PON is selected as an important complement of NG-PON 2. Taking the TWDM-PON system as an example, the TWDM-PON system is formed by stacking 4-8 XG-PONs, shares one optical distribution network ODN, and has the transmission capacity of 40-80 Gb/s. Due to the adoption of the shared ODN, the construction cost CAPEX and the operation cost OPEX are both greatly reduced.
When a TWDM-PON is used to carry wireless backhaul traffic, the mutual communication between eNB base stations through the X2 interface may occur not only within a single wavelength channel but also between multiple wavelength channels. Due to the development of wireless internet, one mainstream trend is: this peering and localized traffic is taking an increasingly important weight among all data throughput, placing stringent requirements on higher capacity and lower latency on the X2 interface. Therefore, how to more efficiently realize the mutual communication between the eNB inside a single wavelength channel and among a plurality of wavelength channels in the TWDM-PON is an important problem to be solved.
Fig. 3 shows a typical architecture of a wireless backhaul within a single wavelength channel and between multiple wavelength channels of a TWDM-PON currently, when an OLT receives an IP packet from a source eNB base station, it can only send the packet up to an edge router ER. The edge router ER then addresses the packet via IP and forwards the packet to the target eNB. This means that the PON network of the access network system provides only a physical transmission medium for the LTE service, and does not perform any routing, processing, and the like. Therefore, this solution has a number of drawbacks:
(1) in this vertical network, all data to be communicated between enbs must pass through the transmission process of "PON access network- > core network- > PON access network". Meaningless uploading and downloading in this process causes a relatively large transmission delay.
(2) All data must be aggregated to the core network even though some packets need only be migrated inside the cellular network. As such local services become more and more abundant, severe signal transmission and data processing pressure will be exerted on the core network. At the same time, a large amount of transmission resources are wasted.
(3) The control and management of the mutual traffic between the eNB base stations is performed in the core network edge router ER. Therefore, the resource allocation strategy cannot be adjusted in time according to the actual situation of the access network.
Although this solution can put the IP packet forwarding function down to the OLT, in this case the OLT must have a layer 3 control function, which is straightforward but expensive. Furthermore, the processing speed is much slower at 3 layers than at 2 layers.
Disclosure of Invention
The invention aims to provide a scheme for efficient mutual communication among wireless base stations eNB of a PON network based on a wavelength division multiplexing mode.
According to an aspect of the present invention, there is provided a method of supporting direct communication between base stations in an Optical Network Unit (ONU) in a Passive Optical Network (PON) system, including: receiving inter-base station interaction data from a source base station associated with an ONU intended for a target base station; packaging the interactive data among the base stations into an uplink PON data frame, and marking ONU information associated with a target base station and corresponding communication wavelength configuration in a frame header of the uplink PON data frame; and sending the uplink PON data frame to an Optical Line Terminal (OLT) of the PON system.
Preferably, the ONU is configured with a correspondence table between a base station associated with the ONU, ONU information associated with the base station, and corresponding communication wavelength configuration in advance.
Preferably, the correspondence table is updated in time when a base station, an associated ONU, or a corresponding communication wavelength configuration in the PON system changes.
Preferably, the change of the correspondence table includes at least one of the following items: ONU newly joins, exits, or base station IP reallocation, or corresponding communication wavelength configuration change.
Preferably, the inter-base station interactive data is encapsulated into an uplink PON data frame in an MPLS over XGEM manner.
Preferably, the PON network is a wavelength division multiplexing-passive optical network (WDM-PON) system or a time division wavelength division stacking multiplexing-passive optical network (TWDM-PON) system. The PON network may also be an optical orthogonal frequency division multiplexing-passive optical network (OFDM-PON) system, and the corresponding communication wavelength configuration is configured as a subcarrier configuration corresponding to an ONU associated with the target base station.
According to another aspect of the present invention, there is provided a method of supporting direct communication between base stations in an Optical Line Terminal (OLT) in a Passive Optical Network (PON) system, including: receiving an upstream PON data frame from a passive Optical Network Unit (ONU); the OLT judges whether the uplink PON data frame is interactive data between wireless network base stations in the PON system or not by analyzing whether the frame header of the uplink PON data frame contains ONU information and corresponding communication wavelength configuration information or not; when the uplink PON data frame is determined to be interactive data between wireless network base stations, the OLT creates a downlink PON data frame according to the ONU information and the corresponding communication wavelength configuration information; and sending the downlink PON data frame to a target ONU in the PON system.
Preferably, when it is determined that the frame header of the uplink PON data frame does not include the target ONU information and the corresponding communication wavelength configuration information, processing a payload of the uplink PON data frame.
Preferably, the OLT is configured with a correspondence table between a wireless network base station associated with the ONU and ONU information associated with the wireless network base station, and a corresponding communication wavelength configuration in advance, and configures the correspondence table to the ONU when the ONU is started.
Preferably, the OLT notifies the ONUs in the PON system to update the correspondence table in time when a configuration of a wireless network base station, an associated ONU, or a corresponding communication wavelength in the PON system changes.
Preferably, the PON network is a wavelength division multiplexing passive optical network (WDM-PON) system or a time division wavelength division stacking multiplexing passive optical network (TWDM-PON) system; the PON network may also be an optical orthogonal frequency division multiplexing-passive optical network (OFDM-PON) system, and the corresponding communication wavelength configuration is configured as a subcarrier configuration corresponding to an ONU associated with the target base station.
According to another aspect of the present invention, there is provided an apparatus for supporting direct communication between base stations in an Optical Network Unit (ONU) in a Passive Optical Network (PON) system, comprising: a receiving unit configured to receive inter-base station interaction data from a source base station with which the ONU is associated, the inter-base station interaction data being destined for a target base station; a processing unit configured to encapsulate the inter-base station interaction data into an uplink PON data frame, and mark ONU information associated with a target base station and a corresponding communication wavelength configuration in a frame header of the uplink PON data frame; a transmitting unit configured to transmit the upstream PON data frame to an Optical Line Terminal (OLT) of the PON system.
Preferably, the aforementioned apparatus further comprises: a storage unit configured to store in advance a correspondence table between a wireless network base station in the PON system and ONU information associated therewith, and a corresponding communication wavelength configuration.
Preferably, the correspondence table is updated in time when a wireless network base station, an associated ONU, or a corresponding communication wavelength configuration in the PON system changes.
Preferably, the processing unit encapsulates the inter-base station interactive data into an uplink PON data frame in an MPLS over XGEM manner.
Preferably, the PON network is a wavelength division multiplexing passive optical network (WDM-PON) system or a time division wavelength division stacking multiplexing passive optical network (TWDM-PON) system; the PON network may also be an optical orthogonal frequency division multiplexing-passive optical network (OFDM-PON) system, and the corresponding communication wavelength configuration is configured as a subcarrier configuration corresponding to an ONU associated with the target base station.
According to another aspect of the present invention, there is provided an apparatus for supporting direct communication between base stations in an Optical Line Terminal (OLT) in a Passive Optical Network (PON) system, comprising: a receiving unit configured to receive an upstream PON data frame from a passive Optical Network Unit (ONU); the control unit is configured to analyze whether a frame header of the uplink PON data frame contains ONU information and corresponding communication wavelength configuration information and judge whether the uplink PON data frame is interactive data between wireless network base stations in the PON system; the processing unit is configured to establish a downlink PON data frame according to ONU information and corresponding communication wavelength configuration information when the uplink PON data frame is determined to be interactive data between wireless network base stations; a transmitting unit configured to transmit the downstream PON data frame to a target ONU in the PON system.
Preferably, the processing unit is further configured to process a payload of the uplink PON data frame when it is determined that the frame header of the uplink PON data frame does not include the target ONU information and the corresponding communication wavelength configuration information.
Preferably, the aforementioned apparatus further comprises: the storage unit is configured to be configured with a corresponding relation table between a wireless network base station associated with the ONU, ONU information associated with the wireless network base station and corresponding communication wavelength configuration; and the sending unit is used for configuring the corresponding relation table to the ONU in the PON system when the ONU is started.
Preferably, when the correspondence table changes, the storage unit notifies the ONU in the PON system to update the correspondence table in time through the sending unit.
According to the method and the device provided by the embodiment of the invention, rapid and low-cost direct interaction between base stations can be realized in a mixed customer premises/mobile backhaul network, and especially, the simultaneous eNB mutual communication based on a two-layer mode between a plurality of different wavelength channels in TWDM-PON based on a wavelength division multiplexing mode and a WDM-PON system becomes possible, so that the communication time delay is greatly reduced, and the increasing pressure on a core network is also relieved.
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The features, nature, and advantages of the present invention will become more apparent from the detailed description set forth below when taken in conjunction with the drawings in which like elements have like numerals wherein:
fig. 1 is an overall LTE network architecture defined by the 3GPP forum;
fig. 2 is a network architecture of a wireless backhaul based PON network;
fig. 3 is a typical architecture of a wireless backhaul based inside a single wavelength channel and between multiple wavelength channels of a TWDM-PON;
fig. 4 is a network structure embodiment of the TWDM-PON system provided in the present invention for simultaneously carrying a customer premises service and a wireless backhaul service.
FIG. 5 is a header embodiment of an XGEM frame provided by the present invention;
fig. 6 is an embodiment of an upstream XGTC burst frame provided by the present invention.
Fig. 7 is a processing and coordination mechanism for performing mutual communication between X2 interfaces inside a single wavelength channel and among multiple wavelength channels of the TWDM-PON system provided in the present invention.
Detailed Description
In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings which form a part hereof. The accompanying drawings illustrate, by way of example, specific embodiments in which the invention may be practiced. The illustrated embodiments are not intended to be exhaustive of all embodiments according to the invention. It should be noted that although the steps of the methods of the present invention are described herein in a particular order, this does not require or imply that these operations must be performed in this particular order, or that all of the illustrated operations must be performed, to achieve desirable results, but rather that the steps described herein can be performed in an order that varies. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions.
Fig. 4 is a network architecture of the TWDM-PON provided by the present invention for simultaneously carrying customer premises traffic and wireless backhaul traffic, where the TWDM-PON system includes an OLT located at a central office, one or more ONUs (e.g., ONU1, ONU2, … …, ONUn) located at a customer side, and an optical splitter/combiner (SPL). Also shown are one or more wireless base stations (illustratively shown as source eNB, target eNB1, and target eNB2) and an Edge Router (ER) of the core network. Wherein each wireless base station in the wireless network is connected to a respective ONU to support mobile backhaul. The edge router ER is connected with the OLT, and the edge router puts the control and management functions of the mutual communication of the eNBs to the OLT, and the OLT directly forwards the mutual communication service between the eNB base stations in a layer 2.
Direct X2 interface communication between base stations is described below by taking as an example communication between a source base station eNB connected to ONU1 and target base stations eNB1 and eNB2, target base station eNB1 connected to ONU2, and target base station eNB2 connected to ONU 3. We can establish and maintain a table of correspondence between eNB and ONU and corresponding wavelength channels in OLT of TWDM-PON system, and refer to table 1, which contains: identity of the radio base station eNB, for example: IP address of eNB, and corresponding information of ONU connected to it, for example: ONU-ID, and corresponding information of the corresponding wavelength channel, such as: WLCH-ID.
The OLT may configure the aforementioned relationship table to the ONU units in the system during the ONU startup authentication process.
The OLT may notify the TWDM-PON and the ONUs in the WDM-PON system to update the correspondence table in time through the sending unit when the correspondence of the correspondence table changes, for example, the base station in the system, the associated ONU, or the corresponding communication wavelength configuration changes and updates in time. Wherein, the change of the corresponding relation table comprises at least one item of the following items: ONU newly joins, exits, or base station IP reallocation, or corresponding communication wavelength configuration change.
Table 1 eNB and ONU and corresponding wavelength channel correspondence table
| eNB IP address | Associated ONU ID | Wavelength channel WLCH-ID |
| IP@eNB | 1 | a |
| IP@eNB2 | 2 | b |
| IP@eNB3 | 3 | c |
| …… | …… | …… |
In the ONU1 associated with the source base station eNB, it receives an IP packet from the X2 interface of the source base station eNB, which may be in MPLS based form, comprising an MPLS label protocol stack and an MPLS payload part. The present PTN technology represented by T-MPLS/MPLS-TP is more and more favored by global mobile operators and comprehensive operators, mainly located in metropolitan access/convergence layers, integrates the advantages of multiple technologies such as SDH, MPLS, Ethernet, and the like, comprehensively meets the mobile service bearing requirements of different evolution stages, and gradually distributes LTE services to newly-built T-MPLS/MPLS-TP networks along with the gradual development of LTE data services.
Next, the ONU1 encapsulates the IP packet from the X2 interface of the source base station eNB into an XGEM frame in conformity with the "MPLS over XGEM" protocol in the g.989.3 standard. According to the relationship table obtained in the foregoing, since the IP addresses of the target eNB1 and the target eNB2 are known, the ONU-ID information of the corresponding target ONU (ONU2 or ONU3) and the corresponding wavelength channel information WLCH-ID can be looked up in the relationship table. As shown in fig. 5, ONU1 identifies ONU-ID information of a target ONU (ONU2 or ONU3) and corresponding wavelength channel information WLCH-ID in the header of the XGEM frame. The XGEM frame generated by the method has the same structure as a normal XGEM frame in a TWDM-PON, and only the frame head 'selectable' field of the XGEM frame is slightly modified. Thus, the upstream XGTC burst frames of ONU1 may be combined as in fig. 6, with the XGTC payload portion comprising both XGEM frames of a conventional TWDM-PON and XGEM frames for the X2 interface combined.
Thereafter, the ONU1 transmits the generated upstream PON data frame including the XGEM frame for the X2 interface to the OLT of the PON system.
In the office OLT illustrated in fig. 4, a port controller may be added to assist interaction between a plurality of OLT ports.
First, upstream PON data from an ONU is received by each OLT port, and for example, an upstream PON data frame of the ONU1 is received at the OLT port 1.
The port controller is connected to the OLT ports in the TWDM-PON OLT, thereby making it possible to interact between a plurality of OLT ports, i.e., between a plurality of wavelength channels, by recognizing an upstream XGEM frame in which eNBs communicate with each other by analyzing the header of the upstream XGEM data frame from each OLT port without processing the payload of the XGEM frame. In particular it relates to XGEM data frame arbitration analysis for X2 interfaces, and downstream PON data frame creation. The port controller may be a logic chip physically existing inside the OLT of the TWDM-PON, and in the illustrated example, it includes two parts, namely a determining unit and a processing unit:
a judging unit, which analyzes whether the frame header of the uplink PON data frame contains ONU information and corresponding communication wavelength configuration information, and judges whether the uplink PON data frame is interactive data between the TWDM-PON and a wireless network base station in the WDM-PON system, for example:
A1) if the destination WLCH-ID field and the destination ONU-ID field of the upstream XGEM frame are empty, the payload of the XGEM frame is the normal PON communication data. The payload of this XGEM frame will be processed in compliance with the protocol of the TWDM-PON.
B1) If the destination WLCH-ID field and the destination ONU-ID field of the upstream XGEM frame are not empty, the payload of this XGEM frame is data communicated with each other between the wireless base stations eNB.
When the uplink XGEM frame is determined as interactive data between wireless network base stations, a downlink PON data frame is created according to the ONU information in the frame header and the corresponding communication wavelength configuration information to directly generate the downlink XGEM frame, and specifically:
A2) if the value of the target WLCH-ID is consistent with the WLCH-ID of the current wavelength channel, the processing unit directly generates a downlink XGEM frame according to the value of the target ONU-ID and sends the downlink XGEM frame to the OLT port of the current wavelength channel without processing the load of the XGEM frame, such as the communication between the source eNB and the target eNB1 in the illustration, wherein the wavelength channel is WLCH 1.
B2) If the value of the target WLCH-ID is inconsistent with the WLCH-ID of the current wavelength channel, the processing unit generates a downlink XGEM frame according to the value of the target ONU-ID, and then sends the downlink XGEM frame to the OLT port of the corresponding wavelength channel, and in the process, the load of the XGEM frame does not need to be processed, such as the communication between the source eNB and the target eNB2 in the illustration, and the wavelength channels are inconsistent, and the processing unit forwards the XGEM data frame for the X2 interface from the port 1 to the port 2.
The OLT port sends the target ONU, and the XGEM frame belonging to the OLT port is filtered out by identifying the frame header of the downlink XGEM frame at the receiving end ONU, and the process is the same as the prior mode.
According to the embodiment, the layer 3-based intercommunication between eNBs through the X2 interface is mapped to the layer 2-based intercommunication between ONUs in the TWDM-PON, and simultaneously the eNB intercommunication is possible to be simultaneously carried out among a plurality of different wavelength channels, when a plurality of source ONU-eNBs belong to different wavelength channels, the uplink XGEM frames used for the eNB intercommunication can be simultaneously uploaded to the corresponding OLT ports in the respective wavelength channels, so that the time delay is greatly reduced.
Fig. 7 is a processing and coordination mechanism for performing mutual communication between X2 interfaces inside a single wavelength channel and among multiple wavelength channels of the TWDM-PON provided by the present invention, which is specifically described as follows:
in the source ONU, the IP packet from the eNB X2 interface is encapsulated into an XGEM frame in step S700, conforming to the "MPLS over XGEM" protocol in the g.989.3 standard. Since the IP address of the target eNB is known, the target ONU information ONU-ID and the corresponding target wavelength channel information WLCH-ID can be looked up in the "relationship table". As shown in fig. 5, it encapsulates the target ONU-ID identifier and the target WLCH-ID in the header of this XGEM frame.
The new XGEM frame generated by the method has the same structure as the normal XGEM frame in the TWDM-PON, and only the frame head 'selectable' field of the XGEM frame is slightly modified. Thus, the upstream XGTC burst frames of ONU1 may be combined as in fig. 6, with the XGTC payload portion comprising both XGEM frames of a conventional TWDM-PON and XGEM frames for the X2 interface combined.
In step S710, when the OLT port of the upstream wavelength channel receives the upstream XGTC burst frame, it sends it to the OLT port controller.
In step S720, the OLT port controller may analyze the header of each XGEM frame one by one. If the "destination WLCH-ID field" is empty, then the frame is a normal XGEM frame for a TWDM-PON, and the OLT port will process the payload of the XGEM frame in accordance with the G.989.3 standard and generate a downstream XGEM frame. If the target WLCH-ID field and the target ONU-ID field of the upstream XGEM frame are not empty, the payload of this XGEM frame is data communicated with each other between the wireless base stations eNB, and step S730 will be performed.
Step S730, when the uplink XGEM frame is determined as interactive data between wireless network base stations, the uplink XGEM frame creates a downlink PON data frame according to the ONU information in the frame header and the corresponding communication wavelength configuration information to directly generate the downlink XGEM frame.
In step 740a, if the value of the target WLCH-ID is consistent with the WLCH-ID of the current wavelength channel, the OLT port controller will generate a downlink XGEM frame to be sent to the OLT port of the current wavelength channel without processing the payload of the XGEM frame, such as the communication between the source eNB and the target eNB1 in the illustrated example, where the wavelength channel is a, and the processing unit will forward the XGEM data frame for the X2 interface from port 1 to the original port 1.
In step 740b, if the value of the target WLCH-ID is not consistent with the WLCH-ID of the current wavelength channel, the OLT port controller sends the generated downlink XGEM frame to the OLT port of the corresponding wavelength channel, and in this process, the payload of the XGEM frame does not need to be processed, for example, the XGEM data frame for the X2 interface from port 1 is forwarded to port 2, where the source eNB and the target eNB2 in the illustrated example are not consistent in wavelength channel.
At the receiving end, ONU2 or ONU3 filters out the XGEM frame belonging to itself by identifying the "XGEM Port-ID" in the header of the downstream XGEM frame, steps 750a, 750 b. If this XGEM frame carries the payload of the X2 interface, it may be that after decapsulation, the data will be sent to the corresponding target eNB1 or eNB 2.
It is worth noting that when multiple source ONU-enbs belong to different wavelength channels, XGEM frames, which each uplink eNB communicates with, will be transmitted using their respective corresponding uplink wavelengths, which can be simultaneously supported by the TWDM-PON system with multiple wavelengths. Therefore, the efficiency of mutual communication between enbs can be greatly improved. Meanwhile, the method provided by the embodiment can also be applied to a WDM-PON system and an optical orthogonal frequency division multiplexing passive optical network (OFDM-PON) system, wherein the WDM-PON system is an important supplementary architecture of the NG-PON 2; the OFDM-PON system adopts a multi-carrier transmission technology, high-speed serial bit information is dynamically distributed to subcarriers with mutually overlapped frequency spectrums, and the frequency spectrum efficiency of the system is effectively improved. The sub-carrier can adopt high-order modulation such as PSK (phase shift keying modulation), QAM (quadrature amplitude modulation) and the like to improve the system capacity, so that the corresponding communication wavelength configuration is the sub-carrier configuration corresponding to the ONU associated with the target base station.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention may be implemented by software plus a necessary hardware platform, and certainly may be implemented by hardware, but in many cases, the former is a better embodiment. With this understanding in mind, all or part of the technical solutions of the present invention that contribute to the background can be embodied in the form of a software product, which can be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods according to the embodiments or some parts of the embodiments of the present invention.
The above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the invention without departing from the spirit and scope of the invention.
Claims (23)
1. A method of supporting direct communication between base stations in an Optical Network Unit (ONU) in a Passive Optical Network (PON) system, comprising:
receiving inter-base station interaction data from a source base station associated with an ONU intended for a target base station;
packaging the interactive data among the base stations into an uplink PON data frame, and marking ONU information associated with a target base station and corresponding communication wavelength configuration in a frame header of the uplink PON data frame;
and sending the uplink PON data frame to an Optical Line Terminal (OLT) of the PON system.
2. The method according to claim 1, wherein the ONU is preconfigured with a correspondence table between ONU-associated base stations and their associated ONU information and corresponding communication wavelength configurations.
3. The method according to claim 2, wherein the correspondence table is updated in time when a base station, an associated ONU, or a corresponding communication wavelength configuration in the PON system changes.
4. The method of claim 3, wherein the change to the correspondence table comprises at least one of: ONU newly joins, exits, or base station IP reallocation, or corresponding communication wavelength configuration change.
5. The method of claim 1, wherein the inter-base station interaction data is encapsulated into upstream PON data frames in an MPLS over XGEM fashion.
6. The method according to any of claims 1 to 5, characterized in that the PON network is a wavelength division multiplexing passive optical network (WDM-PON) system or a time division wavelength division multiplexing passive optical network (TWDM-PON) system.
7. The method according to any of claims 1 to 5, wherein the PON network is an optical orthogonal frequency division multiplexing-Passive optical network (0FDM-PON) system, and the corresponding communication wavelength configuration is a sub-carrier configuration corresponding to an ONU associated with the target base station.
8. A method of supporting direct communication between base stations in an Optical Line Terminal (OLT) in a Passive Optical Network (PON) system, comprising:
receiving an upstream PON data frame from a passive Optical Network Unit (ONU);
the OLT judges whether the uplink PON data frame is interactive data between wireless network base stations in the PON system or not by analyzing whether the frame header of the uplink PON data frame contains ONU information and corresponding communication wavelength configuration information or not;
when the uplink PON data frame is determined to be interactive data between wireless network base stations, the OLT creates a downlink PON data frame according to the ONU information and the corresponding communication wavelength configuration information;
and sending the downlink PON data frame to a target ONU in the PON system.
9. The method of claim 8, further comprising: and when determining that the frame header of the uplink PON data frame does not contain the target ONU information and the corresponding communication wavelength configuration information, processing the payload of the uplink PON data frame.
10. The method of claim 8, wherein the OLT is preconfigured with a correspondence table between ONU-associated wireless network base stations and their associated ONU information, corresponding communication wavelength configurations, and configured to the ONUs at ONU startup.
11. The method of claim 10, wherein the OLT notifies the ONUs in the PON system to update the correspondence table in time when a wireless network base station, an associated ONU, or a corresponding communication wavelength configuration in the PON system changes.
12. The method according to any of the claims 8 to 11, characterized in that the PON network is a wavelength division multiplexing passive optical network (WDM-PON) system or a time division wavelength division stacking multiplexing passive optical network (TWDM-PON) system.
13. The method according to any of the claims 8 to 11, wherein the PON network is an optical orthogonal frequency division multiplexing passive optical network (0FDM-PON) system, and the corresponding communication wavelength configuration is a subcarrier configuration corresponding to an ONU associated with a target base station.
14. An apparatus for supporting direct communication between base stations in an Optical Network Unit (ONU) in a Passive Optical Network (PON) system, comprising:
a receiving unit configured to receive inter-base station interaction data from a source base station with which the ONU is associated, the inter-base station interaction data being destined for a target base station;
a processing unit configured to encapsulate the inter-base station interaction data into an uplink PON data frame, and mark ONU information associated with a target base station and a corresponding communication wavelength configuration in a frame header of the uplink PON data frame;
a transmitting unit configured to transmit the upstream PON data frame to an Optical Line Terminal (OLT) of the PON system.
15. The apparatus of claim 14, wherein the apparatus further comprises:
a storage unit configured to store in advance a correspondence table between a wireless network base station in the PON system and ONU information associated therewith, and a corresponding communication wavelength configuration.
16. The apparatus of claim 15, wherein the correspondence table is updated in time when a wireless network base station, an associated ONU, or a corresponding communication wavelength configuration in the PON system changes.
17. The apparatus of claim 14, wherein the inter-base station interaction data is encapsulated by the processing unit into upstream PON data frames in an MPLS over XGEM fashion.
18. An arrangement according to any of claims 14 to 17, characterized in that said PON network is a wavelength division multiplexing passive optical network (WDM-PON) system or a time division wavelength division stacking multiplexing passive optical network (TWDM-PON) system.
19. The apparatus of any of claims 14 to 17, wherein the PON network is an optical orthogonal frequency division multiplexing-passive optical network (0FDM-PON) system, and wherein the corresponding communication wavelength configuration is a subcarrier configuration corresponding to an ONU associated with a target base station.
20. An apparatus for supporting direct communication between base stations in an Optical Line Terminal (OLT) in a Passive Optical Network (PON) system, comprising:
a receiving unit configured to receive an upstream PON data frame from a passive Optical Network Unit (ONU);
the control unit is configured to analyze whether a frame header of the uplink PON data frame contains ONU information and corresponding communication wavelength configuration information and judge whether the uplink PON data frame is interactive data between wireless network base stations in the PON system;
the processing unit is configured to establish a downlink PON data frame according to ONU information and corresponding communication wavelength configuration information when the uplink PON data frame is determined to be interactive data between wireless network base stations;
a transmitting unit configured to transmit the downstream PON data frame to a target ONU in the PON system.
21. The apparatus of claim 20, wherein the processing unit is further configured to process the payload of the upstream PON data frame when it is determined that the target ONU information and the corresponding communication wavelength configuration information are not included in a frame header of the upstream PON data frame.
22. The apparatus of claim 20, wherein the apparatus further comprises:
the storage unit is configured to be configured with a corresponding relation table between a wireless network base station associated with the ONU, ONU information associated with the wireless network base station and corresponding communication wavelength configuration;
and the sending unit is used for configuring the corresponding relation table to the ONU in the PON system when the ONU is started.
23. The apparatus of claim 22, wherein the storage unit notifies the ONUs in the PON system to update the correspondence table in time through the transmission unit when the correspondence table is changed.
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