CN102355608A - Improved method for fault recovery of multi-granularity optical network based on GMPLS - Google Patents
Improved method for fault recovery of multi-granularity optical network based on GMPLS Download PDFInfo
- Publication number
- CN102355608A CN102355608A CN2011101815843A CN201110181584A CN102355608A CN 102355608 A CN102355608 A CN 102355608A CN 2011101815843 A CN2011101815843 A CN 2011101815843A CN 201110181584 A CN201110181584 A CN 201110181584A CN 102355608 A CN102355608 A CN 102355608A
- Authority
- CN
- China
- Prior art keywords
- wavelength
- wavestrip
- optical
- restoration
- restoration path
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The invention, which belongs to the optical communication and intelligent optical network field, discloses an improved method for fault recovery of a multi-granularity optical network based on a GMPLS. According to the method, on the basis of a message mechanism and a shared backup recovery strategy of GMPLS survivability, fault type are determined at a fault source node; and the fault source node respectively recovers faults according to the fault types. Moreover, according to the invention, a resource utilization rate is high in an optical network environment with high complexity; a needed number of network node ports is small, so that costs are reduced.
Description
Technical field
The present invention relates to the multiple size light network failure recovery method of a kind of improved GMPLS, belong to optical communication, ASON field.
Background technology
Multiprotocol label switching (mpls) basic protocol trestle structure and main characteristic have been inherited in GMPLS (GMPLS), and support multiple new switching fabric type, comprise wavelength level, wavestrip level and the exchange of optical fiber level etc.GMPLS will comprise that time slot, wavelength, wavestrip and fiber port carry out data forwarding as label, and dynamically control and manage through the signaling, Routing Protocol and the new link management mechanism that adopt expansion.For the situation that adapts to multiple granularity service in the following optical-fiber network and deposit; Introduced intelligent multiple size light network (MGON) based on the control plane technology of GMPLS; Realize optical network resource is dynamically controlled and transmitted the requirement of signaling, strengthened the survivability of network in resource and professional dynamic discovery with when flexibly Internet resources being provided.
From network failure type angle, MGON compares traditional optical-fiber network has increased the situation that wavestrip lost efficacy.The possible cause that wavestrip lost efficacy comprises what wavestrip cross-connect in the node, wavestrip multiplexing demultiplexing device (or fibre junction point place) and wavestrip converter fault caused.At this moment, the one or more wavestrips in the optical fiber can be affected and cause blocking, but whole optical fiber can not be affected.From the network failure Restoration Mechanism,, therefore need to consider and formulate the strategy that carries out fault recovery based on wave band channel owing to increased the failure conditions of wave band channel newly.
To supporting flow to dredge the multiple size light network survivability problem of (Traffic Grooming) ability, the solution that has proposed comprises:
Method one: sharing channel protection; Comprise based on the share protect strategy (SPPB) in wavestrip path and based on the share protect strategy (SPPL) of light path [Guo Lin. be applicable to the share protect algorithm and analysis [J] the photon journal thereof of multiple size light network; In April, 2009,38 (04): 847-851].In the SPPB strategy; Article one, path channels (lightpath) will be through one or more shielded wave band channel (bandpath); Promptly, all need on the corresponding protection path, reserve resource backup for each operating wave tape channel of having set up (bandpath).Every work lightpath in the SPPL strategy has the lightpath of a protection, and promptly Bao Hu granularity is a wavelength level.But in optical-fiber network; Adopt this protected mode to node and internodal annexation requirement than higher, so generally be only applicable to the transmission system of point-to-point, in large-scale complex network; Because receiving network topology is connected consistency constraint with wavelength, is difficult to direct employing.
Method two: rerouting recovering.[Lv Wei. the flow of multiple size light network is dredged and is united survivability [D]. the .2006:36-41 of Beijing University of Post & Telecommunication].In this kind method; When setting up wavestrip, need be responsible for handling the node (generally being made as the wavestrip source node) of wavestrip fault recovery and confirm that this wavestrip is to adopt the wavelength or the restoration methods of wavestrip, and preserve fault recovery method at the wavestrip source node through message announcement.Node detection is after fault and fault location, and at first notice is responsible for the node (source node) of wavestrip fault recovery, and the fault recovery method in this this fault of node judgement calculates and set up subsequent use faulty channel by this node, removes faulty channel.The shortcoming of this method is that the idling-resource in the network is fewer and feweri along with traffic carrying capacity increases, and for the rerouting recovering that does not have reserved resource, other recovers various levels to be difficult to all be met.Therefore, when traffic load was heavier in the network, it was lower to revert to power.
In sum, existing MGON protection recovery policy mainly is to be directed against link failure, does not take into full account network factors such as network resource utilization, network node port cost and traffic carrying capacity.Along with the quick raising of the topological complexity and the traffic carrying capacity of optical-fiber network, existing method can't satisfy the protection that realizes the complicated optical-fiber networks of many granularities and the demand of recovery.
Summary of the invention
Technical problem to be solved by this invention is the deficiency to the above-mentioned background technology, and the multiple size light network failure recovery method of a kind of improved GMPLS is provided.After fault localization mechanism was confirmed many granularities node failure to occur in the network, the node of responsible recovery restarted flow and dredges strategy for make a wavestrip recovery of passage calculating passage through affected this subwave of failure node farm labourer.This method has reduced the port cost, shared resource has improved the whole survivability of network.
The present invention adopts following technical scheme for realizing the foregoing invention purpose:
The multiple size light network failure recovery method of a kind of improved GMPLS comprises the steps:
Step 1, when in the optical-fiber network node failure being arranged, optical-fiber network fault location node, malfunctioning node is sent to source node with fault message, and source node is kept the fault recovery type;
Step 2, optical-fiber network source node link control module read every restoration path that calculating is in advance got well in the optical network data storehouse;
Step 3, judge whether interrupting service is that wavelength level is professional:
3-1 when the interruption business is the wavelength level business, gets into step 4;
3-2, when the interruption business was not the wavelength level business, source node was according to wavestrip restoration methods recovered failure;
Step 4, judge whether restoration path has the homology subpath:
4-1 when restoration path has the homology subpath, gets into step 4-1-1;
4-1-1 judges whether the subpath of restoration path is more than 2 jumpings;
When restoration path homology subpath is more than 2 jumpings, get into step 4-1-2;
When restoration path homology subpath is not that source node is according to traditional wavelength restoration methods recovered failure more than 2 jumpings;
4-1-2, source node are idle broadband that wavelength is continuous of restoration path distribution of all homologies according to improved wavelength restoration methods recovered failure, and be specifically following step by step:
4-1-2-1, source node is selected the homology subpath, sets up new wavestrip route;
4-1-2-2, optical-fiber network is set up new being connected through Path message with Resv message, and each wavestrip route is transmitted with the wavestrip level;
4-1-3, optical-fiber network source node link control module is set up new the connection on restoration path; Recovered failure;
4-2, when restoration path did not have the homology subpath, source node was according to traditional wavelength restoration methods recovered failure.
In the multiple size light network failure recovery method of said improved GMPLS, the said wavestrip restoration methods of step 3-2 specifically comprises the steps:
Step 301 is directly set up the wavestrip restoration path;
Step 302 according to the situation of existing wavestrip in the optical-fiber network, is shared and has been built wavestrip;
When having in the optical-fiber network when building wavestrip, newly-established wavestrip restoration path is shared and has been built wavestrip;
When not built wavestrip in the optical-fiber network, be that newly-established wavestrip restoration path is created a new idle wavestrip, recovered failure according to the first-fit strategy.
In the multiple size light network failure recovery method of said improved GMPLS, the said traditional wavelength restoration methods of step 4-1-1 specifically comprises as follows step by step:
Step 401 is set up new wavelength through the Path message in the GMPLS expansion RSVP with Resv message and is connected;
Step 402 is according to the existing wavelength of the situation of existing wavelength in the optical-fiber network;
When reserving wavelength, newly-established wavelength connects shares the wavelength of having reserved;
When not reserved wavelength, for connecting, newly-established wavelength sets up a new idle wavelength according to the first-fit strategy.
In the multiple size light network failure recovery method of said improved GMPLS, step 402 is said, and to have reserved wavelength be the part of wavelength restoration path during other node failures in the optical-fiber network.
In the multiple size light network failure recovery method of said improved GMPLS, step 302 is said, and to have built wavestrip be the part of wavestrip restoration path during other node failures in the optical-fiber network.
The present invention adopts technique scheme, has following beneficial effect: reduced port cost, shared resource, improved the whole survivability of network.
Description of drawings
Fig. 1 is the sketch map that recover in the path in the multiple size light network failure recovery method of improved GMPLS.
Fig. 2 is the flow chart of the multiple size light network failure recovery method of improved GMPLS.
Label declaration among the figure: A, B, C, D, E, F, G, H, I, L, M, N, O are the node in the optical-fiber network, and dotted line is represented restoration path.
Embodiment
Be elaborated below in conjunction with the technical scheme of accompanying drawing to invention:
What Fig. 1 represented is the situation that the node E in the multiple size light network lost efficacy.Supposed that before breaking down all nodes all have the ability of multi-level light exchange, and light exchanges such as a lot of optical fiber levels, wavestrip level and wavelength level are all arranged between each node, the number of wavelengths of wavestrip is at least 2.
Flow chart as shown in Figure 2, the multiple size light network failure recovery method of a kind of improved GMPLS comprises the steps:
Step 1, when in the optical-fiber network node failure being arranged, optical-fiber network fault location node, malfunctioning node is sent to source node with fault message, and source node is kept the fault recovery type;
Step 2, optical-fiber network source node link control module read every restoration path that calculating is in advance got well in the optical network data storehouse;
Step 3, judge whether interrupting service is that wavelength level is professional:
3-1 when the interruption business is the wavelength level business, gets into step 4;
3-2, when the interruption business was not the wavelength level business, source node was according to wavestrip restoration methods recovered failure;
Step 301 is directly set up the wavestrip restoration path;
Step 302 according to the situation of existing wavestrip in the optical-fiber network, is shared and has been built wavestrip;
When having in the optical-fiber network when building wavestrip, newly-established wavestrip restoration path is shared and has been built wavestrip;
When not built wavestrip in the optical-fiber network, be that newly-established wavestrip restoration path is created a new idle wavestrip, recovered failure according to the first-fit strategy.
Step 4, judge whether restoration path has the homology subpath:
4-1 when restoration path has the homology subpath, gets into step 4-1-1;
4-1-1 judges whether the subpath of restoration path is more than 2 jumpings;
Step 401 is set up new wavelength through the Path message in the GMPLS expansion RSVP with Resv message and is connected;
Step 402 is according to the existing wavelength of the situation of existing wavelength in the optical-fiber network;
When reserving wavelength, newly-established wavelength connects shares the wavelength of having reserved;
When not reserved wavelength, for connecting, newly-established wavelength sets up a new idle wavelength according to the first-fit strategy.
When restoration path homology subpath is more than 2 jumpings, get into step 4-1-2;
When restoration path homology subpath is not that source node is according to traditional wavelength restoration methods recovered failure more than 2 jumpings;
4-1-2, source node are idle broadband that wavelength is continuous of restoration path distribution of all homologies according to improved wavelength restoration methods recovered failure, and be specifically following step by step:
4-1-2-1, source node is selected the homology subpath, sets up new wavestrip route;
4-1-2-2, optical-fiber network is set up new being connected through Path message with Resv message, and each wavestrip route is transmitted with the wavestrip level;
4-1-3, optical-fiber network source node link control module is set up new the connection on restoration path; Recovered failure;
4-2, when restoration path did not have the homology subpath, source node was according to traditional wavelength restoration methods recovered failure.
Wherein, step 402 is said, and to have reserved wavelength be the part of wavelength restoration path during other node failures in the optical-fiber network, and step 302 is said, and to have built wavestrip be the part of wavestrip restoration path during other node failures in the optical-fiber network.
When professional LSPs when node A arrives node N, find that node E lost efficacy, cause breaking down through all service link of this node, node E dates back source node A with warning information, and keeps the fault recovery type at source node A.Can know by figure; Wavestrip level B-LSP1 (A-D-E-N) is the wavestrip link from A to N, and wavelength level W-LSP2 (A-G-H-E-N), W-LSP3 (A-G-H-M-E-N), W-LSP4 (A-G-L-M-E-N), W-LSP5 (A-G-L-M-O-E-N), W-LSP6 (A-F-E-N) are that the wavelength from A to N connects.Below be respectively their recovery process.
1. during the B-LSP1 fault; Under reset mode based on wave band channel; The A point is set up B-LSP2 (A-B-C-N); If have and build the just shared wavestrip of having built of wavestrip B-LSP2; Just do not set up a new idle wavestrip for B-LSP2 if built wavestrip, with the processing that realizes that the wavestrip granularity connects according to FF (first-fit) strategy.
2. when W-LSP2 (A-G-H-E-N) and W-LSP3 (A-G-H-M-E-N) fault, the restoration path homology of these two LSP, and the jumping figure of homology subpath is 2, so be these newly-built idle bandwidth B-LSP3 of two LSP (A-G-H-N) just, its wavelength is continuous.
3. with 2., when W-LSP4 (A-G-L-M-E-N) and W-LSP5 (A-G-L-M-O-E-N) fault, be its newly-built B-LSP4 (A-G-L-M-N).
4. when W-LSP6 (A-F-E-N) fault; Owing to do not satisfy homology and dredge strategy; It is carried out wavelength level according to plan recovers; Under the reset mode of wavelength channel; The A point is set up W-LSP7 (A-F-I-N); Build wavelength W-LSP7 with regard to the shared wavelength of having built if having, if just do not set up a new idle wavelength road warp for W-LSP7, to realize the processing of wavelength granularity connection according to FF (first-fit) strategy.
Claims (5)
1. the multiple size light network failure recovery method of an improved GMPLS is characterized in that comprising the steps:
Step 1, when in the optical-fiber network node failure being arranged, optical-fiber network fault location node, malfunctioning node is sent to source node with fault message, and source node is kept the fault recovery type;
Step 2, optical-fiber network source node link control module read every restoration path that calculating is in advance got well in the optical network data storehouse;
Step 3, judge whether interrupting service is that wavelength level is professional:
3-1 when the interruption business is the wavelength level business, gets into step 4;
3-2, when the interruption business was not the wavelength level business, source node was according to wavestrip restoration methods recovered failure;
Step 4, judge whether restoration path has the homology subpath:
4-1 when restoration path has the homology subpath, gets into step 4-1-1;
4-1-1 judges whether the subpath of restoration path is more than 2 jumpings;
When restoration path homology subpath is more than 2 jumpings, get into step 4-1-2;
When restoration path homology subpath is not that source node is according to traditional wavelength restoration methods recovered failure more than 2 jumpings;
4-1-2, source node are idle broadband that wavelength is continuous of restoration path distribution of all homologies according to improved wavelength restoration methods recovered failure, and be specifically following step by step:
4-1-2-1, source node is selected the homology subpath, sets up new wavestrip route;
4-1-2-2, optical-fiber network is set up new being connected through Path message with Resv message, and each wavestrip route is transmitted with the wavestrip level;
4-1-3, optical-fiber network source node link control module is set up new the connection on restoration path; Recovered failure;
4-2, when restoration path did not have the homology subpath, source node was according to traditional wavelength restoration methods recovered failure.
2. the multiple size light network failure recovery method of improved GMPLS according to claim 1, it is characterized in that: the said wavestrip restoration methods of step 3-2 specifically comprises the steps:
Step 301 is directly set up the wavestrip restoration path;
Step 302 according to the situation of existing wavestrip in the optical-fiber network, is shared and has been built wavestrip;
When having in the optical-fiber network when building wavestrip, newly-established wavestrip restoration path is shared and has been built wavestrip;
When not built wavestrip in the optical-fiber network, be that newly-established wavestrip restoration path is created a new idle wavestrip, recovered failure according to the first-fit strategy.
3. the multiple size light network failure recovery method of improved GMPLS according to claim 1, it is characterized in that: the said traditional wavelength restoration methods of step 4-1-1 specifically comprises as follows step by step:
Step 401 is set up new wavelength through the Path message in the GMPLS expansion RSVP with Resv message and is connected;
Step 402 is according to the existing wavelength of the situation of existing wavelength in the optical-fiber network;
When reserving wavelength, newly-established wavelength connects shares the wavelength of having reserved;
When not reserved wavelength, for connecting, newly-established wavelength sets up a new idle wavelength according to the first-fit strategy.
4. the multiple size light network failure recovery method of improved GMPLS according to claim 3 is characterized in that: step 402 is said, and to have reserved wavelength be the part of wavelength restoration path during other node failures in the optical-fiber network.
5. the multiple size light network failure recovery method of improved GMPLS according to claim 2 is characterized in that: step 302 is said, and to have built wavestrip be the part of wavestrip restoration path during other node failures in the optical-fiber network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110181584 CN102355608B (en) | 2011-06-30 | 2011-06-30 | Improved method for fault recovery of multi-granularity optical network based on GMPLS |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110181584 CN102355608B (en) | 2011-06-30 | 2011-06-30 | Improved method for fault recovery of multi-granularity optical network based on GMPLS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102355608A true CN102355608A (en) | 2012-02-15 |
| CN102355608B CN102355608B (en) | 2013-10-30 |
Family
ID=45579093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110181584 Expired - Fee Related CN102355608B (en) | 2011-06-30 | 2011-06-30 | Improved method for fault recovery of multi-granularity optical network based on GMPLS |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102355608B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013189039A1 (en) * | 2012-06-20 | 2013-12-27 | 华为技术有限公司 | Method, system, and node device for establishing recovery path |
| CN104301030A (en) * | 2014-09-18 | 2015-01-21 | 南京邮电大学 | Share protection strategy supporting flow dredging flexible optical network |
| CN104967477A (en) * | 2015-06-26 | 2015-10-07 | 南京邮电大学 | Optical network intelligent P ring protection method based on multicast business |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050240796A1 (en) * | 2004-04-02 | 2005-10-27 | Dziong Zbigniew M | Link-based recovery with demand granularity in mesh networks |
| CN1713779A (en) * | 2004-06-23 | 2005-12-28 | 北京邮电大学 | Light channel creation control in light exchange network with multi-particle size |
| CN101656897A (en) * | 2009-08-31 | 2010-02-24 | 东北大学 | Method for grooming multilayer multi-granularity traffic in waveband switching optical network |
| CN102026051A (en) * | 2010-12-13 | 2011-04-20 | 西安交通大学 | Layered virtual topology-based cross-granularity layer survivability method |
-
2011
- 2011-06-30 CN CN 201110181584 patent/CN102355608B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050240796A1 (en) * | 2004-04-02 | 2005-10-27 | Dziong Zbigniew M | Link-based recovery with demand granularity in mesh networks |
| CN1713779A (en) * | 2004-06-23 | 2005-12-28 | 北京邮电大学 | Light channel creation control in light exchange network with multi-particle size |
| CN101656897A (en) * | 2009-08-31 | 2010-02-24 | 东北大学 | Method for grooming multilayer multi-granularity traffic in waveband switching optical network |
| CN102026051A (en) * | 2010-12-13 | 2011-04-20 | 西安交通大学 | Layered virtual topology-based cross-granularity layer survivability method |
Non-Patent Citations (3)
| Title |
|---|
| YANG WANG等: "Multi-Granular Waveband Assignment and Protection in WDM Networks", 《JOURNAL OF LIGHTWAVE TECHNOLOGY》 * |
| 朱晶晶等: "基于GPMLS的网络流量疏导研究", 《计算机与信息技术》 * |
| 黄骥等: "基于GMPLS的光网络保护恢复的研究", 《通信技术》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013189039A1 (en) * | 2012-06-20 | 2013-12-27 | 华为技术有限公司 | Method, system, and node device for establishing recovery path |
| CN104301030A (en) * | 2014-09-18 | 2015-01-21 | 南京邮电大学 | Share protection strategy supporting flow dredging flexible optical network |
| CN104967477A (en) * | 2015-06-26 | 2015-10-07 | 南京邮电大学 | Optical network intelligent P ring protection method based on multicast business |
| CN104967477B (en) * | 2015-06-26 | 2018-03-13 | 南京邮电大学 | Optical-fiber network intelligence P circle guard methods based on multicast service |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102355608B (en) | 2013-10-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101715149B (en) | Method and device for restoring parallel cross-domain fault of multilayer and multi-domain distributed optical network | |
| CN1333554C (en) | Method for combining multi-section protection and mesh network recovery | |
| US7525907B2 (en) | Method, device and software for establishing protection paths on demand and revertive protection switching in a communications network | |
| CN102137313B (en) | Subtree-based multicasting traffic grooming method in WDM (Wavelength Division Multiplex) optical network | |
| CN102186124B (en) | Utility-based interlayer coordination method in WDM (Wavelength Division Multiplexing) optical network | |
| CN100387035C (en) | Method of proceeding failure recovery using shared spare passage in lattice shape network | |
| Chiu et al. | Integrated restoration for next-generation IP-over-optical networks | |
| US20070014573A1 (en) | Exchange structure and a method of connection configuration between the optical networks | |
| CN101674217B (en) | Method for realizing permanent ring network protection in MESH network | |
| CN106233679A (en) | A kind of Network method for building up, Cooperation controlling center and network system | |
| Tapolcai et al. | A new shared segment protection method for survivable networks with guaranteed recovery time | |
| CN102355608B (en) | Improved method for fault recovery of multi-granularity optical network based on GMPLS | |
| CN111294669B (en) | OTN (optical transport network) network architecture and scheduling method | |
| CN101981844A (en) | A method and apparatus for realizing source routing in the blocked cross network | |
| CN101547382B (en) | Separation method for active-Standby service resource of different source and sink for grid network | |
| Asthana et al. | Protection and restoration in optical networks | |
| CN105611435B (en) | The calculation method of the electric layer wavelet long route across photosphere based on WSON network | |
| CN101969581B (en) | Method, device and system for switching flow of multilayer network | |
| Vizcaíno et al. | Quality of protection schemes with extended flexibility for improved energy efficiency in transport networks | |
| Bakri et al. | An iterative partial path protection-based approach for routing static D-connections in WDM transparent networks with SRLG constraints | |
| CN103547337B (en) | transmission network control method, controller and node | |
| EP2770669B1 (en) | Method and node device for establishing recovery path | |
| Zhang et al. | Research on metro intelligent optical network planning and optimization | |
| Xu et al. | Multi-vendor interconnection-based emergency multi-layer networks in disaster recovery | |
| CN112260793A (en) | Power equipment based on OTN technology application |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20120215 Assignee: Jiangsu Nanyou IOT Technology Park Ltd. Assignor: Nanjing Post & Telecommunication Univ. Contract record no.: 2016320000207 Denomination of invention: Improved method for fault recovery of multi-granularity optical network based on GMPLS Granted publication date: 20131030 License type: Common License Record date: 20161109 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| EC01 | Cancellation of recordation of patent licensing contract | ||
| EC01 | Cancellation of recordation of patent licensing contract |
Assignee: Jiangsu Nanyou IOT Technology Park Ltd. Assignor: Nanjing Post & Telecommunication Univ. Contract record no.: 2016320000207 Date of cancellation: 20180116 |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131030 Termination date: 20200630 |