CN101212790A - Data packet route switching method in mobile communication system - Google Patents

Data packet route switching method in mobile communication system Download PDF

Info

Publication number
CN101212790A
CN101212790A CNA2006101696186A CN200610169618A CN101212790A CN 101212790 A CN101212790 A CN 101212790A CN A2006101696186 A CNA2006101696186 A CN A2006101696186A CN 200610169618 A CN200610169618 A CN 200610169618A CN 101212790 A CN101212790 A CN 101212790A
Authority
CN
China
Prior art keywords
terminal
base station
target
data packet
message
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.)
Pending
Application number
CNA2006101696186A
Other languages
Chinese (zh)
Inventor
杜忠达
王继承
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZTE Corp
Original Assignee
ZTE Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ZTE Corp filed Critical ZTE Corp
Priority to CNA2006101696186A priority Critical patent/CN101212790A/en
Publication of CN101212790A publication Critical patent/CN101212790A/en
Pending legal-status Critical Current

Links

Images

Abstract

The invention discloses a data package path conversion method used in switching of mobile communication systems, which can be applied to a distributed honeycomb-like wireless communication system comprising a terminal, a source base station, a target base station and core network. The path conversion method comprises the following steps: step one, the terminal identity information and communication context corresponding to the terminal are identified according to specific resource used by the terminal after the target base station is connected into the terminal; step two, the target station sends a switching access conformation message to the terminal and sends a data-package path conversion message to the core network according to the context; step three, after the core network receives the data-package path conversion message, the data-package path is converted to the target base station; step four, the terminal sends back a switching finish message to the target base station which sends downstream data-package to the terminal. The data package path conversion method of the invention can shorten the interruption time of downstream user plane in switching process, thus improving quality of the service.

Description

A kind of data packet route switching method in mobile communication system
Technical field
The present invention relates to the distributed cellular wireless telecommunication system, relate to particularly that terminal switches between the base station the time, the packet path conversion method between core net and the base station.
Background technology
The distributed cellular wireless telecommunication system mainly is made up of terminal, base station and core net referring to Fig. 1.As required the logic OR physical connection can be arranged between the base station, the network of being made up of the base station is called wireless access network, and (Radio Access Network RAN), is responsible for the Access Layer affairs, such as the management of Radio Resource; The Radio Resource of up-downgoing is responsible for scheduling according to the mode of shared channel by the base station.Each base station can (Cell Network CN) connects with one or more core net node.Core net is responsible for the Non-Access Stratum affairs, such as mobile management etc.Terminal be meant can with the equipment of network communication, such as mobile phone or notebook computer etc.Each terminal can only be connected to one of them base station in the network on up direction.
As shown in Figure 2, be the method schematic diagram of packet path conversion in existing switching flow and the switching flow, existing packet is changed the mechanism to be described below:
Step 200, downlink data packet sends to terminal 10 from core net 40 by source base station 20;
Step 201, terminal 10 sends measurement report to source base station 20.Source base station 20 judges that according to measurement report and switching control strategy needs switch, and the selected target BS 30 that switches;
Step 203, source base station 20 sends handoff request to target BS 30, comprises necessary communication context in this message.Target BS 30 is prepared private resource after judging that permission is switched, and distributes an identification number for terminal 10;
In this step, between this identification number and the private resource corresponding relation is arranged.
Step 205, target BS 30 sends Handover Request Acknowledge to source base station 20, comprises the identification number of private resource and terminal 10 in this message;
Step 206, source base station 20 sends switching command to terminal 10, comprises the identification number of private resource and terminal 10 in the message;
Step 207, source base station 20 stops the transmission of downlink data packet, and all is transmitted to target BS 30 cached data packet with from the packet of core net 40;
Step 208, terminal 10 insert target BS 30 on private resource; The private resource that target BS 30 uses according to terminal 10, the identity of affirmation terminal 10;
Step 211, target BS 30 send the switching access confirmation message for terminal 10;
Step 212, terminal 10 sends handoff completion message to target BS 30;
Step 213, target BS 30 send the packet path transforming messages for core net 40 after receiving handoff completion message, core net 40 packet path from source base station 20 converting into target base stations 30; And
Step 215, downlink data packet sends to terminal 10 from target BS 30.
In handoff procedure, because target BS has been reserved private resource, condition code such as special use, and set up the corresponding relation of setting up between the identification number of private resource and expression terminal identity, so when terminal when inserting target BS, the corresponding relation of the private resource that target BS can insert according to terminal comes unique identity of accessing terminal determined, just can find corresponding terminal identity number, like this, target BS in fact just can confirm that terminal successfully inserts.
Terminal has received switching command message when target BS send to switch inserts message, and has finished the configuration transitions that comprises in the message and the conversion work on the hardware, such as with the Frequency Synchronization of target BS, frame synchronization etc.On user's face, terminal also left and source base station between get in touch, promptly stopped transmission and reception, and can on down direction, receive packet at source base station.After setting up uplink synchronous between terminal and the target BS, terminal can also begin to send the upstream data bag.In general, in switch inserting response message, comprise uplink synchronous information, such as Timing Advance (Timing Advance, TA).
Receive TA from above-mentioned principle terminal, send the precedence relationship that process such as handoff completion message and target BS require not have between the core net translation data bag certainty.The problem that exists in the system is at present: it is just to send later at the handoff completion message of receiving terminal that target BS requires the message in core net translation data bag path.This way has postponed the conversion in core network data bag path.If this moment target BS on buffer memory packet seldom, perhaps even do not have, the transmitting time of switching packet on the later down direction so will be delayed, and has so just increased the time that packet interrupts on the down direction, will reduce those service quality to the business of delay sensitive.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of data packet route switching method in mobile communication system, is used for shortening the downlink user interrupted time of face at handoff procedure, to improve professional service quality.
To achieve these goals, the invention provides a kind of data packet route switching method in mobile communication system, be used to comprise the distributed cellular wireless telecommunication system of terminal, source base station, target BS and core net, it is characterized in that, comprising:
Step 1, described target BS inserts identity information and the communication context corresponding with described terminal that the private resource that uses according to described terminal the back is confirmed described terminal in described terminal;
Step 2, described target BS send all changing-overs to described terminal and go into acknowledge message, and send a packet path transforming message according to described communication context to described core net;
Step 3, described core net receive described packet path transforming message, and packet path is converted to described target BS from described source base station; And
Step 4, described terminal are returned a handoff completion message and are given described target BS, and described target BS sends to described terminal with downlink data packet.
Described data packet route switching method in mobile communication system, wherein, in the described step 1, described identity information comprises identification number, and between this identification number and the described private resource corresponding relation is arranged.
Described data packet route switching method in mobile communication system, wherein, described private resource is the condition code or the dedicated radio resources of Random Access Channel on the described target BS.
Described data packet route switching method in mobile communication system, wherein, in the described step 1, two, described communication context refers to the communication context of described terminal on described source base station, comprising the address information of described core net.
Described data packet route switching method in mobile communication system wherein, in the described step 1, comprises that also described terminal inserts the step of described target BS according to described private resource, is specially:
Step 51, described terminal send a measurement report to described source base station;
Step 52, described source base station judges that according to described measurement report and switching control strategy needing that described terminal is carried out the base station switches, and sends a handover request message to the selected target BS that switches; And
Step 53, described source base station sends one to described terminal and switches order after receiving a handover request acknowledge message that described target BS returns, and is transmitted to described target BS cached data packet with from the packet of described core net.
Described data packet route switching method in mobile communication system, wherein, between the described step 52,53, also comprise: described target BS is judging that allowing described terminal to carry out the base station switches the step of back for the described private resource of described terminal distribution, identification number; Wherein, between described identification number and the described private resource corresponding relation is arranged.
Described data packet route switching method in mobile communication system wherein, comprises the communication context of described terminal on described source base station, comprising the address information of described core net in the described handoff request message; Respectively comprise the descriptor of described private resource, described identification number in described switching request acknowledgement message, the described switching command.
Described data packet route switching method in mobile communication system, wherein, in the described step 2, described target BS sends the step of described switching access confirmation message to described terminal, does not in time have strict precedence according to described communication context to the step that described core net sends described packet path transforming message with described target BS.
Described data packet route switching method in mobile communication system, wherein, described distributed cellular wireless telecommunication system is a long evolving system.
Useful technique effect of the present invention:
In handoff procedure, shorten the downlink user interrupted time of face, improved professional service quality (Quality of Service, QoS).
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is a distributed cellular wireless telecommunication system structure chart;
Fig. 2 is the method schematic diagram of packet path conversion in existing switching flow and the switching flow;
Fig. 3 optimizes later switching flow and packet path conversion method schematic diagram among the present invention;
Fig. 4 is switching flow and the packet path conversion method schematic diagram that the present invention is applied to the LTE system;
Fig. 5 is the structure chart of LTE system.
Embodiment
Be described in further detail below in conjunction with the enforcement of accompanying drawing technical scheme of the present invention:
Seeing also shown in Figure 3ly, is to optimize later switching flow and packet path conversion method schematic diagram among the present invention.After terminal 10 had inserted target BS 30, in a single day target BS 30 had determined that the identity of terminal 10 just can send message to core net 40, required packet path is switched to target BS 30 from source base station 20.Concrete steps are as follows:
Step 300, downlink data packet sends to terminal 10 from core net 40 by source base station 20;
Step 301, terminal 10 sends measurement report to source base station 20; Source base station 20 judges that according to measurement report and switching control strategy needs switch to target BS 30 with terminal 10 from source base station 20, and the selected target BS 30 that switches;
Step 303, source base station 20 sends handoff request to target BS 30, comprises necessary communication context in this message; Target BS 30 is prepared private resource after judging that permission switches to target BS 30 with terminal 10 from source base station 20, and distributes an identification number for terminal 10;
In this step, between identification number and the private resource corresponding relation is arranged;
In this step, the communication context is meant the communication context of terminal 10 on source base station 20, comprising the address information of core net 40.
Step 305, target BS 30 sends Handover Request Acknowledge to source base station 20, comprises the identification number of the descriptor and the terminal 10 of private resource in this message;
Step 306, source base station 20 sends switching command to terminal 10, comprises the identification number of the descriptor and the terminal 10 of private resource in this message;
Step 307, source base station 20 stops the transmission of downlink data packet, and all is transmitted to target BS 30 cached data packet with from the packet of core net 40;
Step 308, terminal 10 inserts target BS 30 according to private resource; The private resource that target BS 30 uses according to terminal 10, the identity of affirmation terminal 10 and corresponding communication context;
In this step, the communication context is meant the communication context of terminal 10 on source base station 20, comprising the address information of core net 40.
Step 309, target BS 30 subsequently according to the communication context to core net 40 transmit path transforming messages, core net 40 packet path from source base station 20 converting into target base stations 30;
Step 311, target BS 30 send the switching access confirmation message for terminal 10;
Step 312, terminal 10 sends handoff completion message to target BS 30; And
Step 315, downlink data packet sends to terminal 10 from target BS 30.
In the foregoing description, step 309 and step 311 do not have strict precedence in time.
Seeing also shown in Figure 4ly, is switching flow and the packet path conversion method schematic diagram that the present invention is applied to the LTE system, carries out following description in conjunction with Fig. 5:
LTE (Long Term Evolution, the Long Term Evolution) system that present 3GPP (Third Generation Partnership Project, third generation mobile partner plan) is discussing is a typical distribution formula honeycomb mobile communcations system.Base station in this system can be handled on chain of command and be comprised RRC (RadioResource Control, Radio Resource control) at interior protocol stack, comprise RRM (Radio Resource Management, the RRM) function of measuring control and switching etc.On user's face, comprise radio link layer and following functional entity.MME (Mobility Management Entity, Mobility Management Entity) and UPE (User Plane Entity, user entity) are respectively the entities of core network control surface and user's face.
Among this embodiment, terminal A begins to carry out communication with base station S (source base station).Terminal A sends measurement report to base station S, has triggered switching flow, after switching to base station T (target BS), terminal A recover again and base station T between the packet communication.The process of switching is as follows:
Step 400, downlink data packet sends to terminal A from core net by base station S;
Step 401, terminal A sends measurement report to base station S; Base station S judges that according to measurement report and switching control strategy needs switch to target BS (base station T) with terminal A from base station S, and the selected base station T that switches;
Step 403, base station S sends handoff request to base station T, comprises necessary communication context in this message; Base station T distributes private resource after judging that permission switches to target BS T with terminal A from source base station S, and distributes an identification number (C_RNTI) for terminal A;
In this step, between identification number and the private resource corresponding relation is arranged; Wherein, private resource can be that base station T goes up the condition code on the Random Access Channel, or special-purpose Radio Resource;
In this step, the communication context is meant the communication context of terminal A on the S of base station, comprising the address information of core net.
Step 405, base station T sends Handover Request Acknowledge to base station S, comprises the descriptor of private resource and the identification number of terminal A in this message;
Step 406, base station S sends switching command to terminal A, comprises the descriptor of private resource and the identification number of terminal A in this message;
Step 407, base station S stops the transmission of downlink data packet, and all is transmitted to base station T cached data packet with from the next packet of core net;
Step 408, terminal A is according to private resource access base station T; The private resource that base station T uses according to terminal A, identity and the corresponding communication context of affirmation terminal A;
In this step, the communication context is meant the communication context of terminal A on the S of base station, comprising the address information of core net.
Step 409, base station T subsequently according to the communication context to core net transmit path transforming message, core net is transformed into base station T to packet path from base station S;
Step 411, base station T sends the switching access confirmation message for terminal A;
Step 412, terminal A sends handoff completion message to base station T; And
Step 415, downlink data packet sends to terminal A from base station T.
In the foregoing description, step 409 and step 411 do not have strict precedence in time.
Adopt the inventive method in handoff procedure, to shorten the interrupted time of downlink user face, improved professional service quality QoS.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims (9)

1. data packet route switching method in mobile communication system is used to comprise the distributed cellular wireless telecommunication system of terminal, source base station, target BS and core net, it is characterized in that, comprising:
Step 1, described target BS inserts identity information and the communication context corresponding with described terminal that the private resource that uses according to described terminal the back is confirmed described terminal in described terminal;
Step 2, described target BS send all changing-overs to described terminal and go into acknowledge message, and send a packet path transforming message according to described communication context to described core net;
Step 3, described core net receive described packet path transforming message, and packet path is converted to described target BS from described source base station; And
Step 4, described terminal are returned a handoff completion message and are given described target BS, and described target BS sends to described terminal with downlink data packet.
2. data packet route switching method in mobile communication system according to claim 1 is characterized in that, in the described step 1, described identity information comprises identification number, and between this identification number and the described private resource corresponding relation is arranged.
3. data packet route switching method in mobile communication system according to claim 2 is characterized in that, described private resource is the condition code or the dedicated radio resources of Random Access Channel on the described target BS.
4. according to claim 1,2 or 3 described data packet route switching method in mobile communication system, it is characterized in that, in the described step 1, two, described communication context refers to the communication context of described terminal on described source base station, comprising the address information of described core net.
5. data packet route switching method in mobile communication system according to claim 1 is characterized in that, in the described step 1, comprises that also described terminal inserts the step of described target BS according to described private resource, is specially:
Step 51, described terminal send a measurement report to described source base station;
Step 52, described source base station judges that according to described measurement report and switching control strategy needing that described terminal is carried out the base station switches, and sends a handover request message to the selected target BS that switches; And
Step 53, described source base station sends one to described terminal and switches order after receiving a handover request acknowledge message that described target BS returns, and is transmitted to described target BS cached data packet with from the packet of described core net.
6. data packet route switching method in mobile communication system according to claim 5, it is characterized in that, between the described step 52,53, also comprise: described target BS is judging that allowing described terminal to carry out the base station switches the step of back for the described private resource of described terminal distribution, identification number; Wherein, between described identification number and the described private resource corresponding relation is arranged.
7. according to claim 5 or 6 described data packet route switching method in mobile communication system, it is characterized in that, comprise the communication context of described terminal on described source base station in the described handoff request message, comprising the address information of described core net; Respectively comprise the descriptor of described private resource, described identification number in described switching request acknowledgement message, the described switching command.
8. according to claim 1,2,3,5 or 6 described data packet route switching method in mobile communication system, it is characterized in that, in the described step 2, described target BS sends the step of described switching access confirmation message to described terminal, does not in time have strict precedence according to described communication context to the step that described core net sends described packet path transforming message with described target BS.
9. according to claim 1,2,3,5 or 6 described data packet route switching method in mobile communication system, it is characterized in that described distributed cellular wireless telecommunication system is a long evolving system.
CNA2006101696186A 2006-12-25 2006-12-25 Data packet route switching method in mobile communication system Pending CN101212790A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNA2006101696186A CN101212790A (en) 2006-12-25 2006-12-25 Data packet route switching method in mobile communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNA2006101696186A CN101212790A (en) 2006-12-25 2006-12-25 Data packet route switching method in mobile communication system

Publications (1)

Publication Number Publication Date
CN101212790A true CN101212790A (en) 2008-07-02

Family

ID=39612368

Family Applications (1)

Application Number Title Priority Date Filing Date
CNA2006101696186A Pending CN101212790A (en) 2006-12-25 2006-12-25 Data packet route switching method in mobile communication system

Country Status (1)

Country Link
CN (1) CN101212790A (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010088796A1 (en) * 2009-02-03 2010-08-12 华为技术有限公司 Uplink data transmission method during handover procedure, system and radio network node thereof
WO2010111966A1 (en) * 2009-04-02 2010-10-07 中兴通讯股份有限公司 Base station controller (bsc), mobile switching center (msc) and switch method for calling mode
WO2011020248A1 (en) * 2009-08-21 2011-02-24 中兴通讯股份有限公司 Handover system and method for flat mobile communication network
WO2012031507A1 (en) * 2010-09-07 2012-03-15 中兴通讯股份有限公司 Method and system for migration of data transmission channel
CN102695234A (en) * 2011-03-25 2012-09-26 中兴通讯股份有限公司 Service bearing transfer method and apparatus thereof
CN102869056A (en) * 2012-09-14 2013-01-09 中国联合网络通信集团有限公司 Transmission switching method and system under base station straight-through architecture
CN102958054A (en) * 2012-11-26 2013-03-06 中国联合网络通信集团有限公司 Network switching processing method, mobile management entity, base station and network system
CN104080129A (en) * 2013-03-29 2014-10-01 中国移动通信集团公司 Data transmission method and device
CN106031232A (en) * 2014-03-12 2016-10-12 联发科技股份有限公司 Method to reduce service interruption
CN107659970A (en) * 2016-07-25 2018-02-02 普天信息技术有限公司 A kind of packet path conversion method for S1 switchings
WO2018024140A1 (en) * 2016-08-01 2018-02-08 中兴通讯股份有限公司 Handover processing method and device
WO2019057140A1 (en) * 2017-09-22 2019-03-28 华为技术有限公司 Application context processing method and device
CN110622562A (en) * 2017-08-29 2019-12-27 Oppo广东移动通信有限公司 Path switching method and base station
CN111314973A (en) * 2016-08-12 2020-06-19 华为技术有限公司 Data processing method and related equipment

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010088796A1 (en) * 2009-02-03 2010-08-12 华为技术有限公司 Uplink data transmission method during handover procedure, system and radio network node thereof
WO2010111966A1 (en) * 2009-04-02 2010-10-07 中兴通讯股份有限公司 Base station controller (bsc), mobile switching center (msc) and switch method for calling mode
WO2011020248A1 (en) * 2009-08-21 2011-02-24 中兴通讯股份有限公司 Handover system and method for flat mobile communication network
WO2012031507A1 (en) * 2010-09-07 2012-03-15 中兴通讯股份有限公司 Method and system for migration of data transmission channel
CN102404809A (en) * 2010-09-07 2012-04-04 中兴通讯股份有限公司 Method and system for transferring data transmission channel
CN102695234A (en) * 2011-03-25 2012-09-26 中兴通讯股份有限公司 Service bearing transfer method and apparatus thereof
WO2012130046A1 (en) * 2011-03-25 2012-10-04 中兴通讯股份有限公司 Method and apparatus for transferring service bearer
CN102869056A (en) * 2012-09-14 2013-01-09 中国联合网络通信集团有限公司 Transmission switching method and system under base station straight-through architecture
CN102869056B (en) * 2012-09-14 2016-05-18 中国联合网络通信集团有限公司 Transmission changing method and system under the straight-through framework in base station
CN102958054B (en) * 2012-11-26 2016-01-06 中国联合网络通信集团有限公司 network handover process method, mobile management entity, base station and network system
CN102958054A (en) * 2012-11-26 2013-03-06 中国联合网络通信集团有限公司 Network switching processing method, mobile management entity, base station and network system
CN104080129A (en) * 2013-03-29 2014-10-01 中国移动通信集团公司 Data transmission method and device
CN104080129B (en) * 2013-03-29 2017-06-23 中国移动通信集团公司 A kind of method and apparatus of data transfer
CN106031232A (en) * 2014-03-12 2016-10-12 联发科技股份有限公司 Method to reduce service interruption
CN107659970A (en) * 2016-07-25 2018-02-02 普天信息技术有限公司 A kind of packet path conversion method for S1 switchings
WO2018024140A1 (en) * 2016-08-01 2018-02-08 中兴通讯股份有限公司 Handover processing method and device
CN107682899A (en) * 2016-08-01 2018-02-09 中兴通讯股份有限公司 Switching handling method and device
CN111314973A (en) * 2016-08-12 2020-06-19 华为技术有限公司 Data processing method and related equipment
CN110622562A (en) * 2017-08-29 2019-12-27 Oppo广东移动通信有限公司 Path switching method and base station
WO2019057140A1 (en) * 2017-09-22 2019-03-28 华为技术有限公司 Application context processing method and device
CN109547513A (en) * 2017-09-22 2019-03-29 华为技术有限公司 The treating method and apparatus of application context

Similar Documents

Publication Publication Date Title
CN101212790A (en) Data packet route switching method in mobile communication system
US11184886B2 (en) Method, base station, and user equipment for implementing carrier aggregation
CN101606419B (en) Resourse Distribute in target cell after handover
EP2039211B1 (en) Performing handover in a wireless communication system
CN1816184B (en) Integrated base stations and a method of transmitting data units in a communications system for mobile devices
EP1636923B1 (en) Apparatus and method for establishing radio bearer of mobile terminal
JP5492507B2 (en) Base station gateway, base station switching method and data processing method by base station gateway
CN101626565B (en) Method for switching group users in mobile-relay system
CN107135674B (en) Switching method and equipment in ultra-dense network
EP1935117B1 (en) Traffic transmission path relocation method for radio communication system
WO2007126192A1 (en) Data transmission method in mobile communications system
CN103313325A (en) Switching method and device and data processing method and device
CN113473647A (en) Method for supporting data forwarding in small cell system
WO2011000306A1 (en) Method and apparatus for hand-off processing in wireless self-backhaul transmission
CN101355785B (en) Method and system for transmitting non-access layer information during switching procedure
CN111225386A (en) Method, system and equipment for small cell communication
US20230108725A1 (en) Method and apparatus for data transmission
CN101754412B (en) Method, equipment and system for implementing local exchange for base station group in GSM (global system for mobile communications)
CN101641981B (en) Base station, the mobile communication system using base station and data transferring method
WO2020164026A1 (en) Random access method, terminal device, and network device
WO2020155157A1 (en) Security information processing method and apparatus during handover process, network device, and terminal
WO2016116164A1 (en) Method, apparatus, computer program and system

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C02 Deemed withdrawal of patent application after publication (patent law 2001)
WD01 Invention patent application deemed withdrawn after publication

Open date: 20080702