CN101577946A - Seamless switching method, device and system - Google Patents
Seamless switching method, device and system Download PDFInfo
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- CN101577946A CN101577946A CNA200910086982XA CN200910086982A CN101577946A CN 101577946 A CN101577946 A CN 101577946A CN A200910086982X A CNA200910086982X A CN A200910086982XA CN 200910086982 A CN200910086982 A CN 200910086982A CN 101577946 A CN101577946 A CN 101577946A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0064—Transmission or use of information for re-establishing the radio link of control information between different access points
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
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Abstract
The invention discloses a seamless switching method, a device and a system. The method comprises the steps that a source base station receives notification message which is sent by a destination base station; the notification message is used for notifying the source base station that the user equipment is accessed to the destination base station; and when receiving the notification message, the source base station disconnects the communication connection with the user equipment. By the embodiment of the invention, the problem that the average transmission rate of business data during UE switch is reduced can be solved.
Description
Technical field
The present invention relates to mobile communication technology, particularly a kind of seamless handover method, device and system.
Background technology
Long Term Evolution (Long Term Evolution, LTE) in the system, subscriber equipment (User Equipment, UE) the cardinal principle flow process of switching between source base station (Source eNodeB) and purpose base station (Target eNodeB) is as follows: at first, source base station sends handoff request to the purpose base station, after the success of purpose base station assigns resource, send handoff response to source base station; Afterwards, the source base station self radio LCP that resets (Radio Link Control protocol, RLC) layer, and send switching command to UE, UE after receiving switching command, disconnects and being connected of source base station, attempts access purpose base station simultaneously; Afterwards, source base station is the serial-number-state (SN Status) of this side notice purpose base station, simultaneously with the data cached purpose base station that is transmitted to of this side; Afterwards, if UE successfully inserts the purpose base station, inserting successfully, back UE begins to carry out the up-downgoing transfer of data with the purpose base station, the purpose base station is upgraded and gateway (Serving Gateway, SGW) IP path connects, and beginning and gateway carry out normal up-downgoing transfer of data, realizes communicating by letter of wireless access network and core net; If UE does not successfully insert the purpose base station, then UE can return back to source base station, attempts inserting source base station again.
The inventor finds prior art in realizing process of the present invention there are the following problems at least: UE can cause professional average transmission rate to reduce when switching.
Summary of the invention
The invention provides a kind of seamless handover method, device and system, the lower problem of transmission rate when switching in order to solve UE.
The embodiment of the invention provides a kind of seamless handover method, comprising:
Source base station receives the notification message that the purpose base station sends, and described notification message is used to notify described source base station subscriber equipment to insert described purpose base station;
Source base station is after receiving described notification message, and disconnection communicates to connect with described subscriber equipment.
The embodiment of the invention also provides a kind of seamless handover method, comprising:
The purpose base station judges whether subscriber equipment has inserted the purpose base station;
The purpose base station sends a notification message to source base station after subscriber equipment has inserted the purpose base station, and described notification message is used to notify described source base station subscriber equipment to insert the purpose base station.
The embodiment of the invention provides a kind of seamless switching device, comprising:
Receiver module is used to receive the notification message that the purpose base station sends, and described notification message is used to notify described source base station subscriber equipment to insert described purpose base station;
Processing module is connected with described receiver module, is used for after receiving described notification message, and disconnection communicates to connect with described subscriber equipment.
The embodiment of the invention also provides a kind of seamless switching device, comprising:
Judge module is used to judge whether subscriber equipment has inserted the purpose base station;
Notification module is connected with described judge module, is used for sending a notification message to source base station after subscriber equipment has inserted the purpose base station, and described notification message is used to notify described source base station subscriber equipment to insert the purpose base station.
The embodiment of the invention provides a kind of seamless switch-over system, comprising:
The purpose base station is used for sending a notification message to source base station after subscriber equipment has inserted the purpose base station, and this notification message is used to notify described source base station subscriber equipment to insert the purpose base station;
Source base station is used to keep and the communicating to connect of subscriber equipment, and until receiving the described notification message that the purpose base station sends, after receiving described notification message, disconnects and being connected of described subscriber equipment.
As shown from the above technical solution, the embodiment of the invention is by when UE switches, and source base station continues to keep professional number to pass, and can guarantee that communication is not interrupted between source base station and the UE, can improve the transmission rate of switching certificate.
Description of drawings
Fig. 1 is the method flow schematic diagram of first embodiment of the invention;
Fig. 2 is the method flow schematic diagram of second embodiment of the invention;
Fig. 3 is the handling process schematic diagram of the source base station inside of third embodiment of the invention;
Fig. 4 is the handling process schematic diagram of the purpose inside of base station of fourth embodiment of the invention;
Fig. 5 is the apparatus structure schematic diagram of fifth embodiment of the invention;
Fig. 6 is the apparatus structure schematic diagram of sixth embodiment of the invention;
Fig. 7 is the system configuration schematic diagram of seventh embodiment of the invention.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
In realizing process of the present invention, the inventor finds in the prior art that the main cause that UE can cause message transmission rate to reduce is as follows when switching:
UE is when switching, the processing delay, ascending wireless resource control (Radio Resource Control, RRC) processing delay of the processing delay of signaling, descending RRC signaling, the forwarding time delay when switch in the path that comprise radio layer from the time delay of source base station access purpose base station.When UE switched, prior art was that UE receives and just cuts off behind the switching command of source base station and being connected of source base station, and afterwards, just attempts to connect the purpose base station.Promptly when switching, can occur one section UE neither with source base station also not with time of purpose base station.Be the processing delay of radio layer during this period of time.
After the communication disruption of UE and base station caused data congestion, congestion window can be reduced to very little.Even follow-up UE is connected with the purpose base station, carry out proper communication after because congestion window can be linear growth after being increased to a certain degree, the speed that congestion window increases is also slower.And the size of congestion window is directly proportional with message transmission rate, therefore, UE when switching and the communication disruption of base station can cause the reduction of message transmission rate.
For this reason, the invention provides following scheme:
Fig. 1 is the method flow schematic diagram of first embodiment of the invention, comprising:
Step 11: source base station receives the notification message that the purpose base station sends, and described notification message is used to notify described source base station subscriber equipment to insert described purpose base station;
Step 12: source base station is after receiving described notification message, and disconnection communicates to connect with described subscriber equipment.
Present embodiment is by after receiving the notification message that characterizes handover success, the disconnection source base station is connected with UE's, can reduce the processing delay of the above-mentioned radio layer that communication disruption causes, effectively avoid triggering and start slowly and congestion avoidance mechanism, therefore, the message transmission rate in the time of can significantly improving switching.
In realizing process of the present invention, the inventor finds also in the prior art that UE loss of data may occur when switching, and its main cause that loss of data may occur is as follows:
When switch taking place, the RLC of source base station at first can empty and self can not successfully organize the data of bag and self is resetted, no matter and whether UE successfully inserts the purpose base station.RLC will cause the disconnection of communicating by letter of source base station and UE with self resetting, and UE disconnect with being connected of source base station after, can not successfully insert the purpose base station probably, UE can insert source base station (switching rollback) again at this moment.But, because the RLC of source base station resetted and emptied self the data that can not organize bag, when UE switches rollback, the data of RLC are owing to lack the data that these are cleared, the a part of data that caused UE also can not be at rlc layer close set bag, thereby can produce packet loss, causes loss of data.
For this reason, the invention provides following scheme:
Source base station and UE keep communicating to connect, even switch when taking place, still keep current connection status; Source base station receives the notification message that the purpose base station sends, and this notification message is used for notification source base station UE and has inserted the purpose base station; Source base station is according to described notification message, and disconnection communicates to connect with described UE's, and the rlc layer that resets.
Present embodiment is by after receiving the notification message that characterizes handover success, the disconnection source base station is connected with UE's, can reduce the processing delay of the above-mentioned radio layer that communication disruption causes, effectively avoid triggering and start slowly and congestion avoidance mechanism, therefore, the message transmission rate in the time of can significantly improving switching.Simultaneously, the RLC that after UE successfully inserts the purpose base station, resets again, the data loss problem that may occur in the time of can avoiding switching rollback.
First embodiment is described the handling process of source base station, below from source base station and purpose base station and the UE side unite and be described.
Fig. 2 is the method flow schematic diagram of second embodiment of the invention, comprising:
Step 201: source base station sends handoff request to the purpose base station.
Step 202: after the success of purpose base station assigns resource, send handoff response to source base station.
Step 203: source base station sends switching command to UE.
Step 201-203 can adopt existing techniques in realizing, repeats no more.
Step 204: source base station and UE continue to keep communicating to connect, the deal with data transmission.In the prior art, UE can cut off and being connected of source base station, in the present embodiment after receiving the switching command that source base station sends, UE all can not initiate to disconnect the flow process that is connected with the other side with source base station, but continues to keep communicating to connect and the data processing state of source base station and UE.
Step 205:UE attempts inserting the purpose base station.
Step 206-207: the purpose base station judges whether UE successfully inserts, if UE successfully inserts the purpose base station, then the purpose base station sends a notification message to source base station, and this notification message shows that UE successfully inserts the purpose base station.
Step 208: after source base station received this notification message, disconnection was connected with UE's.Afterwards, proper communication is carried out in UE and purpose base station, realizes the base station switching.
In the present embodiment, when switching generation, source base station still keeps and being connected of UE, after UE successfully inserts the purpose base station, the purpose base station sends a notification message to source base station, source base station disconnects and being connected of UE more afterwards, can guarantee that the communication of UE when switching do not interrupt, and it is congested and transmission rate that cause reduces problem to avoid occurring TCP.
Above-mentioned outside interaction flow to source base station and purpose base station and UE is described, and the inside interaction flow of concrete source base station and purpose base station can be referring to following embodiment:
Fig. 3 is the handling process schematic diagram of the source base station inside of third embodiment of the invention, comprising:
Step 301: after the L3 entity of source base station receives the handoff response of purpose base station, (Packet Data Convergence Protocol, PDCP) layer entity sends at the serial-number-state of the data of transmission and obtains (SN Status Get) message to the PDCP of source base station.
After the PDCP layer entity of source base station obtains message and obtains sequence number by serial-number-state, this sequence number can be write in the PDCP layer entity of purpose base station by the L3 entity of source base station and the L3 entity of purpose base station, afterwards, the purpose base station can be according to this sequence number to handling through the data of purpose base station, for example, handle successively according to the sequence number of its data packets for transmission the purpose base station.
Step 302: the PDCP layer entity of source base station responds the SN status message to L3, and continues the state of activation of maintenance PDCP layer, and the biography of line number up and down of eat dishes without rice or wine (with the interface of UE) is handled in continuation and the line number up and down of S1 interface (with the interface of SGW) passes.
Step 303: the rlc layer of source base station and PDCP layer continue to keep state of activation, and the PDCP layer entity is handled the upstream data from rlc layer, for these upstream datas generate corresponding SN numbering, and up orderly bag are passed to SGW; The PDCP layer entity of source base station and rlc layer entity continue the downlink data of treatment S GW, give the purpose base station with these data forwarding simultaneously.
Step 304: after UE successfully inserted the purpose base station, the L3 layer entity of source base station received the notification message of the L3 layer entity transmission of purpose base station, and this notification message shows that UE successfully inserts the purpose base station.
Step 305: after the L3 layer entity of source base station received the notification message of purpose base station, disconnection was connected with UE's.
Step 306-307: after the L3 layer entity of source base station receives this notification message, send the message of handover success to the PDCP of source base station layer entity.After the PDCP layer entity receives handover success message, send handover success message to the rlc layer entity.
After step 308-309:RLC layer entity receives handover success message, give the PDCP layer entity, then self is resetted the data set bag that self can organize bag.Afterwards, the PDCP layer entity is submitted up ordered data, up out of order data of buffer memory and downlink data.The burst that can not organize bag when rlc layer resets abandons at rlc layer.
Step 310: the PDCP layer entity of source base station is transmitted to data in buffer the PDCP layer entity of purpose base station.
In the above-mentioned steps, step 305 does not have the sequential restriction relation with step thereafter.
In the source base station side, the L3 layer entity just disconnects after UE successfully inserts the notification message of purpose base station and being connected of UE receiving in the present embodiment, and the communication in the time of can guaranteeing to switch is not interrupted, and avoids the problem of the message transmission rate reduction that existing interrupt communication causes; Simultaneously, the L2 layer entity RLC that just resets after UE successfully inserts the purpose base station can make the state of activation that keeps source base station in handoff procedure, does not abandon the data that the rlc layer entity is preserved, the data loss problem when avoiding UE to switch rollback.
The 3rd embodiment is the flow process of source base station side, and the flow process of purpose base station is described below:
Fig. 4 is the handling process schematic diagram of the purpose inside of base station of fourth embodiment of the invention, comprising:
Step 401: the purpose base station is after UE successfully inserts, and the L3 layer entity of purpose base station sends a notification message to the L3 of source base station layer entity, and this notification message shows that UE successfully inserts the purpose base station.
Step 402: the data that transmit the PDCP layer entity reception sources base station of purpose base station;
Step 403: the PDCP layer entity of purpose base station carries out priority treatment to the forwarding data that receive.At the PDCP of purpose base station layer, can there be the SN value of the SN value of the data in the forwarding cache greater than the PDCP layer entity, because, source base station is to obtain the SN state earlier, afterwards the SN value of obtaining is write in the PDCP layer entity of purpose base station, and after process in, source base station is still in deal with data, and for these data generate corresponding SN, because the SN value is just to increase by 1 after handling a packet, the SN of the data of these subsequent treatment will be greater than the SN value of obtaining in advance.In present standard, the data that purpose base station meeting priority treatment is transmitted, therefore, the purpose base station can be according to the algorithm that reorders of existing protocol, and the SN state of the purpose that upgrades in time base station PDCP layer entity keeps synchronously.
Step 404: the PDCP layer entity of purpose base station receives the status report that UE sends, and deletes the downlink data that has received that this status report is confirmed.Because source base station downlink data from core net when switching sends to UE on one side, Yi Bian be transmitted to the purpose base station, this can cause a part of data UE of purpose base station to have received, status report is used to confirm the data that received.Therefore this part redundant data can be deleted according to the status report of UE, does not have any hidden danger.
Present embodiment is in the purpose base station side, and the purpose base station sends a notification message to source base station after UE successfully inserts this purpose base station, is connected so that source base station disconnects with UE.And the purpose base station is by to transmitting reordering of data, can keep the serial-number-state (SN Status) and the SN information synchronization of transmitting packet of self PDCP layer, can in time delete redundant data simultaneously, avoids UE reprocessing identical data.
Fig. 5 is the apparatus structure schematic diagram of fifth embodiment of the invention, comprises receiver module 51 and processing module 52.Receiver module 51 is used to receive the notification message that the purpose base station sends, and this notification message is used for notification source base station UE and has inserted the purpose base station.Processing module 52 is connected with described receiver module 51, is used for according to after receiving described notification message, and disconnection communicates to connect with described UE's.The device of present embodiment is arranged on the source base station side.
For fear of the existing data loss problem that may occur, present embodiment can also comprise reseting module, is connected with described receiver module, is used for after receiving described notification message, and rlc layer resets.
Present embodiment is by after receiving the notification message that characterizes the UE handover success, the disconnection source base station is connected with UE's, can avoid the processing delay of the above-mentioned radio layer that communication disruption causes, avoid triggering and start slowly and congestion avoidance mechanism, therefore, the message transmission rate in the time of can significantly improving switching.Simultaneously, the RLC that after UE successfully inserts the purpose base station, resets again, the data loss problem that may occur in the time of can avoiding rollback.
Fig. 6 is the apparatus structure schematic diagram of sixth embodiment of the invention, comprises judge module 61 and notification module 62.Judge module 61 is used to judge whether UE has inserted the purpose base station; Notification module 62 is connected with described judge module 61, is used for sending a notification message to source base station when UE has inserted the purpose base station, and described notification message is used for the described UE in notification source base station and has inserted the purpose base station.The device of present embodiment is arranged on the purpose base station side.
Present embodiment is by after receiving the notification message that characterizes the UE handover success, disconnection and source base station are connected with UE's, can avoid the processing delay of the above-mentioned radio layer that communication disruption causes, avoid triggering and start slowly and congestion avoidance mechanism, therefore, the message transmission rate in the time of can significantly improving switching.
Fig. 7 is the system configuration schematic diagram of seventh embodiment of the invention, comprises purpose base station 71 and source base station 72.Purpose base station 71 is used for sending a notification message to source base station after UE successfully inserts the purpose base station, and this notification message is used for notification source base station UE and has inserted the purpose base station; Source base station 72 is connected with described purpose base station 71, is used to keep and the communicating by letter of UE, and until receiving the described notification message that the purpose base station sends, after receiving described notification message, disconnects and being connected of described UE.For fear of the existing data loss problem that may occur, the source base station of present embodiment can also be used for the rlc layer that resets again after receiving described notification message.
Present embodiment is by after receiving the notification message that characterizes the UE handover success, the disconnection source base station is connected with UE's, can avoid the processing delay of the above-mentioned radio layer that communication disruption causes, avoid triggering and start slowly and congestion avoidance mechanism, therefore, the message transmission rate in the time of can significantly improving switching.Simultaneously, the RLC that after UE successfully inserts the purpose base station, resets again, in the time of can avoiding switching rollback, the data loss problem that may occur.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not limit it, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that: it still can make amendment or be equal to replacement technical scheme of the present invention, and these modifications or be equal to replacement and also can not make amended technical scheme break away from the spirit and scope of technical solution of the present invention.
Claims (10)
1, a kind of seamless handover method is characterized in that, comprising:
Source base station receives the notification message that the purpose base station sends, and described notification message is used to notify described source base station subscriber equipment to insert described purpose base station;
Source base station is after receiving described notification message, and disconnection communicates to connect with described subscriber equipment.
2, method according to claim 1 is characterized in that, the notification message that receives the transmission of purpose base station comprises before:
After source base station receives the handoff response of purpose base station, continue to handle the data of transmission and be the data formation sequence of transmission number;
Source base station sends to described subscriber equipment and purpose base station with serialized data.
3, method according to claim 1 is characterized in that, the notification message that source base station receives the transmission of purpose base station comprises: layer 3 entity of source base station receive described notification message; Described method also comprises:
After layer 3 entity of described source base station receive described notification message, send handover success message to the packet data convergence protocol entity, described packet data convergence protocol entity sends handover success message to the radio link control layer entity;
After described radio link control layer entity receives handover success message, will organize the bag the data set bag after send to the packet data convergence protocol entity, afterwards, abandon the data that can not organize bag, and self resetted.
4, a kind of seamless handover method is characterized in that, comprising:
The purpose base station judges whether subscriber equipment has inserted the purpose base station;
The purpose base station sends a notification message to source base station after subscriber equipment has inserted the purpose base station, and described notification message is used to notify described source base station subscriber equipment to insert the purpose base station.
5, method according to claim 4 is characterized in that, also comprises: the serialized data that reception sources base station, purpose base station sends, and the data of the described source base station forwarding of priority treatment.
6, according to claim 4 or 5 described methods, it is characterized in that, also comprise: the purpose base station receives the status report that described subscriber equipment sends, and deletes the downlink data that had received that described status report is confirmed.
7, a kind of seamless switching device is characterized in that, comprising:
Receiver module is used to receive the notification message that the purpose base station sends, and described notification message is used to notify described source base station subscriber equipment to insert described purpose base station;
Processing module is connected with described receiver module, is used for after receiving described notification message, and disconnection communicates to connect with described subscriber equipment.
8, device according to claim 7 is characterized in that, also comprises:
Reseting module is connected with described receiver module, is used for after receiving described notification message, and the radio link control layer resets.
9, a kind of seamless switching device is characterized in that, comprising:
Judge module is used to judge whether subscriber equipment has inserted the purpose base station;
Notification module is connected with described judge module, is used for sending a notification message to source base station after subscriber equipment has inserted the purpose base station, and described notification message is used to notify described source base station subscriber equipment to insert the purpose base station.
10, a kind of seamless switch-over system is characterized in that, comprising:
The purpose base station is used for sending a notification message to source base station after subscriber equipment has inserted the purpose base station, and this notification message is used to notify described source base station subscriber equipment to insert the purpose base station;
Source base station is used to keep and the communicating to connect of subscriber equipment, and until receiving the described notification message that the purpose base station sends, after receiving described notification message, disconnects and being connected of described subscriber equipment.
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| CNA200910086982XA CN101577946A (en) | 2009-06-12 | 2009-06-12 | Seamless switching method, device and system |
| PCT/CN2010/073860 WO2010142253A1 (en) | 2009-06-12 | 2010-06-12 | Mothod, equipment and system for seamless switching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNA200910086982XA CN101577946A (en) | 2009-06-12 | 2009-06-12 | Seamless switching method, device and system |
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| CN101577946A true CN101577946A (en) | 2009-11-11 |
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| CNA200910086982XA Pending CN101577946A (en) | 2009-06-12 | 2009-06-12 | Seamless switching method, device and system |
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| CN (1) | CN101577946A (en) |
| WO (1) | WO2010142253A1 (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2010142253A1 (en) * | 2009-06-12 | 2010-12-16 | 华为技术有限公司 | Mothod, equipment and system for seamless switching |
| CN104038971A (en) * | 2013-03-06 | 2014-09-10 | 电信科学技术研究院 | Link switching method and link switching device |
| WO2014186961A1 (en) * | 2013-05-22 | 2014-11-27 | 华为技术有限公司 | User equipment network accessing method, and access device |
| CN106332198A (en) * | 2012-05-18 | 2017-01-11 | 华为技术有限公司 | Data transmission method, data transmission device and communication system |
| CN107277879A (en) * | 2016-04-01 | 2017-10-20 | 北京三星通信技术研究有限公司 | A kind of method and base station equipment for supporting seamless switching |
| WO2017194021A1 (en) * | 2016-05-13 | 2017-11-16 | 中兴通讯股份有限公司 | Switching method and device |
| CN108112041A (en) * | 2016-11-24 | 2018-06-01 | 中国移动通信有限公司研究院 | A kind of switching method, source base station, target BS and terminal |
| CN108124293A (en) * | 2017-12-15 | 2018-06-05 | 中国人民解放军32039部队 | Voice service switching method and device in spatial isomerism integrated network |
| CN108702671A (en) * | 2016-02-19 | 2018-10-23 | 三星电子株式会社 | Method and apparatus for minimizing switching in cordless communication network according to the break period of transmission |
| CN109121168A (en) * | 2017-06-23 | 2019-01-01 | 中国移动通信有限公司研究院 | A kind of switching method, base station and computer storage medium |
| CN109845321A (en) * | 2016-10-11 | 2019-06-04 | 瑞典爱立信有限公司 | Data transmission during switching |
| CN113812129A (en) * | 2019-04-30 | 2021-12-17 | Lg电子株式会社 | Method and apparatus for transmitting packet based on reception of handover command in wireless communication system |
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| EP3468250B1 (en) * | 2016-07-15 | 2020-09-16 | Huawei Technologies Co., Ltd. | Switching method and apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101026856A (en) * | 2006-02-20 | 2007-08-29 | 华为技术有限公司 | Empty message sequence processing method and system for mobile terminal switching process |
| CN100551157C (en) * | 2006-03-29 | 2009-10-14 | 中兴通讯股份有限公司 | A kind of base station switch method |
| CN101577946A (en) * | 2009-06-12 | 2009-11-11 | 华为技术有限公司 | Seamless switching method, device and system |
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2009
- 2009-06-12 CN CNA200910086982XA patent/CN101577946A/en active Pending
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2010
- 2010-06-12 WO PCT/CN2010/073860 patent/WO2010142253A1/en active Application Filing
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| Publication number | Priority date | Publication date | Assignee | Title |
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