CN108337709B - Cross-cell switching method and system - Google Patents
Cross-cell switching method and system Download PDFInfo
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- CN108337709B CN108337709B CN201711426952.XA CN201711426952A CN108337709B CN 108337709 B CN108337709 B CN 108337709B CN 201711426952 A CN201711426952 A CN 201711426952A CN 108337709 B CN108337709 B CN 108337709B
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- 230000001360 synchronised effect Effects 0.000 claims description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/12—Shortest path evaluation
- H04L45/123—Evaluation of link metrics
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/90—Buffering arrangements
- H04L49/9005—Buffering arrangements using dynamic buffer space allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
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Abstract
The invention provides a method for cross-cell lossless handover, which comprises the following steps: when a station STA needs to be switched, a source access point CAP sends a data message forwarding request to a target access point CAP; the target CAP replies a data message forwarding response to the source CAP; a source access point CAP sends a switching response signaling to the station STA; a source access point CAP sends a downlink data message which needs to be sent to a station STA to a target CAP; and the destination CAP sends the downlink message to the station STA. And provides a corresponding system. By adopting the technical scheme provided by the invention, the sequencing of the downlink data packet text can be realized without dropping the packet in the switching process of the STA. Although the air wireless interface is interrupted for a certain time in the switching process of the STA, the upper application layer of the STA still obtains the lossless and ordered message transmission effect finally through the interaction between CAPs and the forwarding of data packet messages.
Description
Technical Field
The invention belongs to the technical field of wireless communication, and particularly relates to a cross-cell lossless handover method and a cross-cell lossless handover system.
Background
The ultra-high speed wireless local area network needs to bear various communication service types, such as streaming media services of online voice, video and the like, which have high requirements on real-time indexes such as delay, jitter and the like, and the ultra-high speed wireless local area network must support the movement of a user, simultaneously keep the ongoing communication service from being interrupted, and provide communication experience of continuous switching of the user service as fast as possible.
A conventional local area network (lan) is implemented by using a user-triggered handover mechanism, and there is no coordination control between Central Access Points (CAPs), and a handover process in a specific embodiment in the prior art is shown in fig. 1. Thus, part of data messages are lost in the switching process, the lost messages must be recovered by depending on a retransmission mechanism of an upper layer application, switching service cutoff to a certain degree is caused, and user experience is poor.
In order to overcome the defects of the switching mechanism triggered by the user in the existing wireless local area network, a new switching mechanism needs to be provided, so that better service quality guarantee is provided for the terminal user, and the lossless switching requirement of a user layer is met.
Disclosure of Invention
In view of this, the technical problem to be solved by the present invention is to provide a method and a system for cross-cell handover, which are triggered and controlled by a network, and can provide better service quality guarantee for a terminal user through mutual coordination and cooperation between adjacent CAPs, thereby satisfying the requirement of lossless handover at a user layer.
The method for cross-cell lossless handover provided by the embodiment of the invention comprises the following steps:
when a station STA needs to be switched, a source access point CAP sends a data message forwarding request to a target access point CAP;
the destination CAP replies a data message forwarding response to the source CAP;
the source access point CAP sends a switching response signaling to the station STA;
the source access point CAP sends a downlink data message which needs to be sent to the station STA to the target CAP;
and the destination CAP sends the downlink message to the station STA.
Wherein, the downlink data packet message includes:
buffering in the source access point CAP, sending the source access point CAP to the STA through an air interface, but not receiving the data plane message confirmed by the STA; or
And buffering the data plane messages which are not sent to the STA through an air interface in the source access point CAP.
The method further comprises the following steps:
and the STA and the target CAP are synchronized, and access to the network after a random access process and a capability negotiation signaling process are carried out.
Preferably, the method further comprises:
the station STA sends an ARP message in an uplink mode, and the target CAP receives and forwards the ARP message to the gateway switch.
The method further comprises the following steps:
the target CAP sends a data link updating success message to the source CAP;
and the source CAP sends a data forwarding flow end message to the destination CAP.
The embodiment of the invention also provides a system for realizing cross-cell lossless handover, which comprises a first access point CAP and a second access point CAP:
the first access point CAP sends a data message forwarding request to the second access point CAP when the station STA needs to be switched;
the second access point CAP replies a data message forwarding response to the first CAP;
the first access point CAP sends a switching response signaling to the station STA;
the first access point CAP sends a downlink data message which needs to be sent to the station STA to the second CAP;
and the second access point CAP sends the downlink message to the station STA.
The downlink data packet message comprises:
buffering in a first access point CAP, sending the data plane message to the STA through an air interface, but not receiving the data plane message confirmed by the STA; or
And buffering the data plane messages which are not sent to the STA through an air interface in the first access point CAP.
In the system, a second access point CAP receives an ARP message sent by a station STA in an uplink manner and forwards the ARP message to a gateway switch.
The second access point CAP sends a successful message of data link update to the first access point CAP;
the first access point CAP sends a data forwarding procedure end message to the second access point CAP.
In summary, the lossless switching scheme provided by the present invention can enable the STA to realize the ordering of the downlink data packet during the switching process without dropping the packet. Although the air wireless interface is interrupted for a certain time in the switching process of the STA, the upper application layer of the STA still obtains the lossless and ordered message transmission effect finally through the interaction between CAPs and the forwarding of data packet messages.
For the purposes of the foregoing and related ends, the one or more embodiments include the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative aspects and are indicative of but a few of the various ways in which the principles of the various embodiments may be employed. Other benefits and novel features will become apparent from the following detailed description when considered in conjunction with the drawings and the disclosed embodiments are intended to include all such aspects and their equivalents.
Drawings
Fig. 1 is a schematic flowchart of a cross-cell handover in the prior art;
fig. 2 is a flowchart of a cross-cell handover method according to an embodiment of the present invention.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments of the invention may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed.
In order to achieve the object of the present invention, the present invention provides a method for cross-cell handover in a wireless local area network, which is different from the conventional wireless local area network, and the handover mechanism provided by the present invention is dominated and controlled by the network. And the forwarding control of the data message of the mobile terminal is realized by the interaction between the two CAPs. Thereby realizing lossless switching. The process is shown in fig. 2, and the specific steps are as follows:
s201: the source CAP issues a measurement control message to the STA.
S202: STA sends switching request message to source CAP;
s203: the source CAP sends a data message forwarding request message (control signaling) to the destination CAP. Meanwhile, the downlink data message aiming at the STA sent by the gateway/exchange side is still received;
s204: the destination CAP replies with a data message forward response message (control signaling) to the source CAP indicating that the destination CAP is ready to accept the forwarded data.
S205: the source CAP sends handoff response signaling to the STA. And simultaneously stopping sending the downlink data packet to the STA.
S206: the source CAP forwards the downlink data packet message to the STA to the destination CAP, which includes the following steps:
the first type: buffering in a source CAP, sending the data plane messages to the STA through an air interface, but not receiving the data plane messages confirmed by the STA;
the second type: those data plane messages that are buffered in the source CAP and not yet sent to the STA over the air interface.
S207: the STA and the target CAP are synchronized, randomly accessed, and accessed after the capability negotiation can be carried out in a signaling flow.
S208: the destination CAP2 begins sending downlink data packets to the STA (the downlink data packets are forwarded from the source CAP).
S209: STA sends ARP (Address Resolution protocol) message upstream, and target CAP receives and forwards the message to the gateway switch. The gateway/switch will then send downlink data messages for that STA to the target CAP.
S210: the target CAP sends a successful data link update message to the source CAP, and the source CAP receives the message and can know that the exchanger will not continue to issue the downlink data corresponding to the STA to the source CAP.
S211: and the source CAP sends all the residual data packet messages which are not sent completely and are cached locally to the target CAP.
S212: the source CAP sends a data forwarding flow end message to the destination CAP.
S213: the destination CAP sends the data message forwarded from the source CAP to the STA in a priority scheduling mode.
S214: after the target CAP sends all the data packet messages forwarded from the source CAP to the STA, the target CAP starts to schedule and send the buffered new downlink data messages to the STA. And entering a normal data transmission flow (so as to ensure the orderliness of the downlink data packet received by the STA).
The embodiment of the invention also provides a system for realizing cross-cell lossless handover, which comprises a first access point CAP and a second access point CAP:
the first access point CAP sends a data message forwarding request to the second access point CAP when the station STA needs to be switched;
the second access point CAP replies a data message forwarding response to the first CAP;
the first access point CAP sends a switching response signaling to the station STA;
the first access point CAP sends a downlink data message which needs to be sent to the station STA to the second CAP;
and the second access point CAP sends the downlink message to the station STA.
The downlink data packet message comprises:
buffering in a first access point CAP, sending the data plane message to the STA through an air interface, but not receiving the data plane message confirmed by the STA; or
And buffering the data plane messages which are not sent to the STA through an air interface in the first access point CAP.
In the system, a second access point CAP receives an ARP message sent by a station STA in an uplink manner and forwards the ARP message to a gateway switch.
The second access point CAP sends a successful message of data link update to the first access point CAP;
the first access point CAP sends a data forwarding procedure end message to the second access point CAP.
In summary, in the technical solution provided by the present invention, the downlink data packet for the STA side is transmitted in the specific switching process through the coordination control interaction between CAPs. The complete lossless switching process can be completed by using a simpler signaling process, so that the data lossless property in the switching process is ensured, and lossless and reliable transmission is provided for an upper layer user layer protocol.
Those of skill in the art will understand that the various exemplary method steps and apparatus elements described in connection with the embodiments disclosed herein can be implemented as electronic hardware, software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative steps and elements have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The various illustrative elements described in connection with the embodiments disclosed herein may be implemented or performed with a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
The steps of a method described in connection with the embodiments disclosed above may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a subscriber station. In the alternative, the processor and the storage medium may reside as discrete components in a subscriber station.
The disclosed embodiments are provided to enable those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope or spirit of the invention. The above-described embodiments are merely preferred embodiments of the present invention, which should not be construed as limiting the invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. A method of cross-cell lossless handover, the method comprising:
when a station STA needs to be switched, a source access point CAP sends a data message forwarding request to a target access point CAP;
the destination CAP replies a data message forwarding response to the source CAP;
the source access point CAP sends a switching response signaling to the station STA;
the source access point CAP sends a downlink data message which needs to be sent to the station STA to the target CAP;
the target CAP sends the downlink message to the station STA;
the station STA sends an ARP message in an uplink way, and the target CAP receives and forwards the ARP message to the gateway switch;
the target CAP sends a data link updating success message to the source CAP;
and the source CAP sends a data forwarding flow end message to the destination CAP.
2. The method of claim 1, wherein the downlink packet includes:
buffering in the source access point CAP, sending the source access point CAP to the STA through an air interface, but not receiving the data plane message confirmed by the STA; or
And buffering the data plane messages which are not sent to the STA through an air interface in the source access point CAP.
3. The method of claim 1, further comprising:
and the STA and the target CAP are synchronized, and access to the network after a random access process and a capability negotiation signaling process are carried out.
4. A system for implementing a cross-cell lossless handover, the system comprising a first access point CAP and a second access point CAP:
the first access point CAP sends a data message forwarding request to the second access point CAP when the station STA needs to be switched;
the second access point CAP replies a data message forwarding response to the first access point CAP;
the first access point CAP sends a switching response signaling to the station STA;
the first access point CAP sends a downlink data message which needs to be sent to the station STA to the second CAP;
the second access point CAP sends the downlink message to the station STA;
the second access point CAP receives an ARP message sent by the station STA in an uplink manner and forwards the ARP message to a gateway switch; the second access point CAP sends a successful data link update message to the first access point CAP;
and the first access point CAP sends a data forwarding flow end message to the second access point CAP.
5. The system of claim 4, wherein said downstream packet includes:
buffering in the first access point CAP, sending the data plane message to the STA through an air interface, but not receiving the data plane message confirmed by the STA; or
And buffering the data plane messages which are not sent to the STA through an air interface in the first access point CAP.
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| CN201711426952.XA CN108337709B (en) | 2017-12-26 | 2017-12-26 | Cross-cell switching method and system |
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| CN108337709B true CN108337709B (en) | 2021-08-24 |
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| CN104170461A (en) * | 2014-04-02 | 2014-11-26 | 华为技术有限公司 | Data transmission method and base station |
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| US8881236B2 (en) * | 2011-02-04 | 2014-11-04 | Futurewei Technologies, Inc. | Method and apparatus for a control plane to manage domain-based security and mobility in an information centric network |
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| CN104170461A (en) * | 2014-04-02 | 2014-11-26 | 华为技术有限公司 | Data transmission method and base station |
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