CN1951128B - System and method for implementing a media independent handover - Google Patents
System and method for implementing a media independent handover Download PDFInfo
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- CN1951128B CN1951128B CN2005800145476A CN200580014547A CN1951128B CN 1951128 B CN1951128 B CN 1951128B CN 2005800145476 A CN2005800145476 A CN 2005800145476A CN 200580014547 A CN200580014547 A CN 200580014547A CN 1951128 B CN1951128 B CN 1951128B
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Abstract
A system for implementing a media independent switchover in a station in a wireless communication system includes a physical sublayer management entity, a medium access control sublayer management entity, a management information base, and a switchover policy function. The switchover policy function is capable of receiving measurements and system information from the physical sublayer management entity, the medium access control sublayer management entity, and the management information base. The switchover policy function is capable of then autonomously determining whether to execute a switchover.
Description
Technical field
The present invention generally goes up relevant with wireless communication system, and particularly and a kind of being used between the different networks form, the method and system of enforcement media independent handovers is relevant.
Background technology
Typical portable system has two kinds of main operator schemes: standby mode (Idle mode) and connection mode (Connect mode).In standby mode, this platform (STA) characteristic comprises: no user's service (in other words, not having ongoing calling or business); The monitoring calling channel; Available services request channel; Can be used for 100% receiver during chain measures under this radio environment; The background coordinate; And the access point that is not ranked (AP) and/or technology are selected again.In connection mode, this sta characteristics comprises: initiatively user's service (similarly being afoot calling); Possible switching; For the limited receiver availability (because priority of this user) that measures; And be ranked access point and/or the technology switching coordinated fully.
Getting into (similarly being when starting) before the standby mode, this platform must be carried out selection, is used for this best access point and techniques available of this request user service with decision.When in standby mode, this platform is continuously with the contiguous access point of different technologies check.Based on one " preferable " decision of access point, this platform just shifts (in other words, carry out " select ") to this new access point again.
When in connection mode, a kind of basis is transferred to another from an access point and provides " preferable " switching that access point produced of service, comprise and switch to an access point that uses different technologies.In an ideal situation, need not serve to produce significantly to this active user and disturb, just can switch.
One target is for example between different wireless local area network network (WLAN) form, or between the different networks form between a WLAN and the cellular system, reaches a kind of no seam and switch (in other words, allowing moving of a platform).Present technology does not provide the switching of this form.
Fig. 1 is the icon of existing cellular mobility model 100, shows that a kind of provided for radio resources management (RRM) method is for this ambulant subject under discussion.One cellular platform 102 (for example a second generation moves platform or third generation user equipment) is in more than one access point 104, to move freely.This access point 104 can comprise but not be restricted to global system for mobile communications (GSM) base station and FDD/code division multiple access (FDD/CDMA) Node B.This access point 104 is connected to each other through a radio net 106.One switches policing feature (HPF) 108 is used, and with in these platform 102 corresponding moving, instructs this platform 102 in this access point 104.These switchover policy function 108 centralized configuration (for example among a second generation base station controller (BSC) or a third generation radio network controller (RNC)), and be connected with a network 110 (for example a switch or server).
This switchover policy function 108 provides coordinate when this platform 102 moves for diverse access point 104.This platform 102 transmits and measures to this switchover policy function, and these switchover policy function 108 generations should be positioned at the final decision on which access point 104 about this switching and this platform 102.
In this model 100, it produces semi-static frequency to each access point 104 and specifies, and needs some radio plan.In standby mode; Internal technology (for example between the global system for mobile communications) and technology (for example between global system for mobile communications and the FDD/code division multiple access) both access point selection/trade-off decisions more each other; Be in this platform 102, to produce, and support by the system information (from this network 110) of these switchover policy function 108 broadcasting.In connection mode, the access point handover decisions is in this switchover policy function 108, to produce, and supports that by the measurement that this platform produced this measurement then is sent to this switchover policy function 108 through the L3 signal.
Fig. 2 is the icon of existing WLAN mobility model 200, shows that a kind of distributed rrm approach is for this ambulant subject under discussion.One 802.x platform 202 is in most access points 204, to move freely, and it can comprise but not be restricted to 802.11a and 802.16 access points.This access point 204 is communicated by letter with a network 208 (for example gateway or router) through a radio net 206.
In this model 200, it produces dynamic frequency to each access point 204 and specifies, and does not need radio plan.The switch forms of unique support is that a kind of internal technology (for example between the 802.11a) standby mode switches in this mobility model 200, and wherein this access point selection/trade-off decision is independent generation the in this platform 202 again.This another kind switch forms (standby and connection mode with mutual technology) is not supported in this mobility model 200.
In this distributed rrm approach, this access point 204 can use anywhere, and itself is dynamic management.There is not the real employed central point of provided for radio resources management of doing, and therefore in this structure, just do not carry out the assembly that switches.
Fig. 3 is used for cellular and the mobile system structure WLAN form at present.One General Packet Radio Service (GPRS) (second generation) platform 300 comprises a physical layer 302, a Data Link Layer 304 and a network layer 306.This Data Link Layer 304 comprises medium access control (MAC) sublevel 310 and radio link control (RLC) sublevel 312.This network layer 306 comprises a global system for mobile communications (GSM) radio resource (RR) manager 314, one portable management (MM) protocol manager 316, and an internet communication protocol (IP)/integration management device 318.
One third generation partnership projects plan (3GPP) platform 320 comprises a physical layer 322, a Data Link Layer 324 and a network layer 326.This Data Link Layer 324 comprises medium access control sublevel 330 and radio link control sublevel 332.This network layer 326 comprises a third generation (3G) radio resource controller 334, one portable management protocol management device 336, and one internet communication protocol/integration management device 338.
One 802.xx platform 340 comprises physical layer 342, a Data Link Layer 344 and a network layer 346.This Data Link Layer 344 comprises medium access control sublevel 350 and a logical connection (LLC) sublevel 352.This network layer 346 comprises a portable internet communication protocol manager 354 and one internet communication protocol/integration management device 356.
This radio resource manager/controller (314,334) is managed this instantaneous radio link, is handled the information of all relevant radio link.This movable type management protocol management device (316,336,354) is handled the network-level subject under discussion, similarly is that registration and the position when this platform moves for system upgraded (in other words, the subject under discussion beyond this calling itself).
Present WLAN system only provides a limited locomotivity.Internal technology (for example between 802.11) and technology (for example between 802.11 and 802.16) user transfer each other; Be a kind of to use " connect before earlier disconnected (break before make) " strategy supported; It has again and again the characteristic of selection operation for the handover operation in a complete portable system of typical case (for example global system for mobile communications) by contrast.This issues limit the growth of wlan technologies, just as the method and can't satisfy and support similarly to be that sound is the same with the real-time time service of video streaming.
Summary of the invention
The present invention is a kind of for internal technology and mutual technological transfer scheme, implements the technical solution of a complete portable way, and satisfies the demand of real-time and non real-time both services.The present invention is the switchover policy function of a kind of irrelevant device (device-agnostic), and it draws up restriction seldom on this physical implementation.The present invention supports the transfer between the WLAN; Also support the transfer between WLAN and the wired local area network; And can integrate with a typical cellular system (for example global system for mobile communications) that moves, to realize a mobile wireless LAN/cellular scheme completely.
A kind of in a wireless communication system platform, be used to implement the system of media independent handovers, comprise a physics physical sublayer management, medium access control physical sublayer management, a management information bank and a switching policing feature.This switchover policy function has the ability that receives measurement and system information from this physics physical sublayer management, this medium access control physical sublayer management and this management information bank.This switchover policy function has the ability whether independent decision then carries out a switching.
A kind of in wireless communication system with a platform and an access point, be used to implement the system of media independent handovers.This platform comprises a physics physical sublayer management, medium access control physical sublayer management, and a media independent handovers (MIH) layer.This media independent handover layer is communicated by letter with this physics physical sublayer management and this medium access control physical sublayer management.This access point comprises one and switches policing feature, and this switchover policy function is communicated by letter with this media independent handover layer, and determines whether this platform should carry out switching.
A kind of in a wireless communication system platform, be used to implement the method for media independent handovers, it begins through a switching policing feature is provided.System measurements and information are to provide to this switchover policy function from this platform.And according to this system measurements and information, whether decision carries out switching.
A kind of in a wireless communication system, be used to implement the method for media independent handovers, it is through providing a media independent handover layer in a platform, and in an access point, provides one to switch policing feature and begin.It is to be sent to this access point from this platform through this media independent handover layer that platform measures.Whether this this platform of switchover policy function decision should carry out switching.This switching is through controlling via the information that this media independent handover layer transmitted.
A kind of in a wireless communication system, be used to implement the platform of media independent handovers, comprise a physics physical sublayer management, medium access control physical sublayer management, a management information bank, and one switches policing feature.This switchover policy function has the ability that receives measurement and system information from this physics physical sublayer management, this medium access control physical sublayer management and this management information bank.This switchover policy function has the ability whether independent decision then carries out a switching.
A kind of in a wireless communication system platform, be used to implement the integrated circuit of media independent handovers, comprise a physics physical sublayer management, medium access control physical sublayer management, a management information bank, and one switches policing feature.This switchover policy function has from this physics physical sublayer management, this medium access control physical sublayer management and this management information bank reception measurement ability with system information, and this switchover policy function has the ability whether independent decision then carries out a switching.
Description of drawings
From after to a preferred embodiment giving example and to combine to follow the description of icon mode, can obtain for trickle understanding of the present invention:
Fig. 1 is the icon of existing cellular mobility model;
Fig. 2 is the icon of existing WLAN mobility model;
Fig. 3 is for be used for cellular and the moving structure icon WLAN latticed form at present;
Fig. 4 is a kind of consistent moving structure icon in WLAN with the present invention, and compares with the cellular network form;
Fig. 5 is a kind of WLAN mobility model consistent with the present invention;
Fig. 6 is the construction that shows a platform structure, with the distributed switchover policy function of embodiment of the present invention; And
Fig. 7 is the construction that shows a platform structure, with the centralized switchover policy function of embodiment of the present invention.
Embodiment
After this, this term " platform " comprise but be not restricted to a wireless transmission/receive unit, user outfit, a fixed or portable subscriber unit, a calling set, or any device form that can in a wireless environment, operate.Equally after this, this term " access point " comprise but be not restricted to a base station, a Node B, a positioner, or any interface arrangement form in a wireless environment.
Fig. 4 is a kind of moving structure icon in WLAN, and compares with the cellular network form.This General Packet Radio Service platform 300 is identical with the above-mentioned platform that is connected with Fig. 3 with this third generation partnership projects plan platform 320.One 802.xx platform 400 comprises a physical layer 402, a Data Link Layer 404 and a network layer 406.This Data Link Layer 404 comprises a medium access control sublevel 410 and a logical connection sublevel 412.This network layer 406 comprises a media independent handover layer 414, one portable internet communication protocol manager 416, and one internet communication protocol/integration management device 418.The main points of this discussion are this media independent handover layer 414, with and how in a portable model, to operate.This media independent handover layer 414 is implemented and this global system for mobile communications radio resource manager 314 and third generation radio resource controller 334 identical functions.
Fig. 5 is a kind of WLAN mobility model 500 consistent with the present invention, and it shows two kinds of distributed and centralized basic switchover policy function selecting.These are selected and be not that the situation of location is relevant in advance by portable model institute, in other words, have the standby mode and the connection mode switching of internal technology switching.
One 802.x platform 502 is freely among a plurality of access points 504, to move, and it can comprise but not be restricted to 802.11a and 802.16 access points.This access point 504 passes through a radio net 506, and communicates by letter with a network 508 (for example gateway or router).
This model 500 can be implemented a kind of distributed switchover policy function 510 at platform 502 places, or implements a kind of centralized switchover policy function 520 at these network 508 places.
In a distributed switchover policy function setting, this STA automatically performs this selection, and this is selected and switches decision, and this comprises standby mode, the inherent choice of technology/select again, and both connection mode switch forms.
In a centralized HPF set, position this switchover policy function assistance on this system side should be selected and select processing again, and produced the handover decisions that this platform acquisition of information is supported.This information is through signal mechanism of the present invention (in other words, this media independent handover layer), communicates by letter with this switchover policy function from this platform.This comprises standby mode, the inherent choice of technology/select again, and both connection mode switch forms.
Fig. 6 shows a kind of functional structure block diagram that is used for the distributed switchover policy function platform 600 of embodiment of the present invention.This platform 600 comprises a physics physical sublayer management (ME) 602 and medium access control physical sublayer management 604.One switches policing feature 606 communicates by letter with this physics physical sublayer management 602 and this medium access control physical sublayer management 604.One local management information bank 608 stores 606 accesses of this switchover policy function, produces the information of this handover decisions.This physics physical sublayer management 602 comprises a physical layer convergence procedure (PLCP) sublevel 610 and independent (PMD) sublevel 612 of a physical medium.This medium access control physical sublayer management 604 comprises medium access control sublevel 614.
This platform 600 produces independently to be selected and handover decisions again.This switchover policy function 606 is from this medium access control physical sublayer management 604 and this physics physical sublayer management 602, reception information and other incident (generally being meant the information that is used in the generation handover decisions).This switchover policy function 606 is handled this information and is produced an independent decision of whether implementing to switch.
This is a kind of limited switching technical solution, and just this selects the extension of step again, and can in a typical portable system, possess.This is a kind of suitable but inferior good technical solution, mainly is owing to use a kind of " having no progeny earlier meets (break then make) " strategy.With this strategy, when a platform knew that its radio link is degenerated, it was before setting up new link, and time-out link at present maybe this link stops voluntarily.Just do not guarantee to accomplish the resource availability of switching, and possibly make and lack in order to adapt to this new access point dropped calls of this switchable resource.The possibility of this dropped calls has suitable technical solution when non real-time is served, but for similarly being just inappropriate for the real-time service of audio communication.In addition, for identical reason, this is a kind of technical solution of not enough scale, and in other words, when adding this system along with more platform, this performance just can worsen.
Fig. 7 shows a kind of functional structure block diagram that is used to implement centralized switchover policy function platform 700.This platform comprises a physics physical sublayer management 702 and medium access control physical sublayer management 704.One media independent handover layer 706 is communicated by letter with this physics physical sublayer management 702 and this medium access control physical sublayer management 704.This media independent handover layer 706 is communicated by letter with the media independent handover layer 708 on this system side.This media independent handover layer 708 is communicated by letter with system's switchover policy function 710.This physics physical sublayer management 702 comprises a physical layer convergence procedure sublevel 712 and a physical medium independence sublevel 714.This medium access control physical sublayer management 704 comprises medium access control sublevel 716.
This media independent handover layer 706 and this system's switchover policy function 710 are through these media independent handover layer 708 communications.This media independent handover layer 706 transmits and measures to this system's switchover policy function 710, and these system's switchover policy function 710 transfer system information are to this media independent handover layer 706.This selects to be based on handover decisions the exchange of this information again, between this media independent handover layer 706 and this system's switchover policy function 710, coordinates.Using this media independent handover layer 706, this media independent handover layer 708, with this system's switchover policy function 710, is to switch similar with a kind of cellular system pattern.
Selection is by 710 coordinations of this system's switchover policy function with handover decisions again, and is supported by the measurement repayment and the system's signal that are received through this media independent handover layer 706, media independent handover layer 708.This is a kind of quick, best switching technical solution because this centralized decision work out use a kind of " make-before-break (make then break) " and strategy, and guarantee to accomplish the resource availability of switching.This is a kind of technical solution that is applicable to the non real-time service, also is applicable to real-time service, and adjusts scale easily, and a kind of complete portable technical solution is provided.
In order to support a complete portable technical solution, need a mobile communication agreement (similarly being that portable management, portable internet communication protocol, communication start agreement (SIP) or the like) and resource control communication protocol (similarly being that radio resource is controlled (RRC) or media independent handover layer) both.This mobile communication agreement support similarly be find, registration, the switching that transmits, stop (or calling), locate in this network level (between two switches), and the function of maintaining secrecy.This resource control communication protocol support similarly is system information, termination (or calling), cell selecting/select again, sets up, discharges, measures repayment, power control, and the switching of locating in this radio stratum (between two radio).Yet,, be to be required in order to support a complete portable technical solution in the support that two stratum places provide.
On this network side, this media independent handover layer 708 and this switchover policy function 710 both can be positioned at any among between among the entity, similarly be an access point, a server, a database, or a router.In a preferred embodiment, this media independent handover layer 708 is to be arranged in an access point or an access point controller with this switchover policy function 710.This media independent handover layer 708 is collected needed information as a state machine, and is sent to this switchover policy function 710.This switchover policy function 710 is just according to the information generating handover decisions that is received.
Though this embodiment is described with a kind of situation of WLAN, the principle of present embodiment is applicable to the wireless communication system of any pattern too.This centralized switchover policy functional structure can be extended to support wireless to wired inter-working scheme, similarly is the switchover policy that connects wireless device to a wired system.Its example can use a kind of laptop computer of 802.11 activations, and the ether that then butt joint (docking) this computer, and use switches to utilize this computer Docking station connects.
Though the assembly that in Fig. 6 and Fig. 7, shows is the assembly that is described as separating; These assemblies also can be regarded as a single integrated circuit (IC); Similarly be ASIC (ASIC), most integrated circuit, discrete component, or the combining of discrete component and integrated circuit.In implementation-specific was done, the function of the embodiment of the invention and characteristic may reside in discrete component/integrated circuit, and can be by part/complete anergy or cancellation.
Though characteristic of the present invention is described with specific combining in this preferred embodiment with assembly; Each characteristic or assembly can be by independent use the characteristic and assembly of other this preferred embodiment (not with), or with further feature of the present invention with assembly or produce different combinations individually.
Claims (22)
1. platform that is configured to implement centralized switchover policy function, this platform comprises:
IEEE 802.xx medium access control physical sublayer management;
IEEE 802.xx physics physical sublayer management; And
Media independent handover layer; This media independent handover layer be configured to said platform in medium access control physical sublayer management and physics physical sublayer management communicate, and receive portable protocol information and resource control protocol information from network switchover policy function.
2. platform according to claim 1 is characterized in that, said media independent handover layer also is configured to metrical information is sent to said switchover policy function.
3. platform according to claim 1 is characterized in that, said media independent handover layer also be configured in order to said platform in IEEE 802.xx LLC communicate by letter.
4. platform according to claim 1 is characterized in that, said network switchover policy function is the assembly in the wireless network.
5. platform according to claim 1 is characterized in that, said portable protocol information comprises switching command, and wherein said platform also is configured to carry out the switching from first network to second network in response to said switching command.
6. platform according to claim 5 is characterized in that, said first network is a cellular network, and said second network is an IEEE 802.xx network.
7. platform according to claim 5 is characterized in that, said first network is an IEEE 802.xx network, and said second network is a cellular network.
8. platform according to claim 5 is characterized in that, said first network is an IEEE 802.xx network, and said second network is an IEEE 802.xx network.
9. platform according to claim 8 is characterized in that, said first network is IEEE 802.16 networks, and said second network is IEEE 802.11 networks.
10. platform according to claim 8 is characterized in that, said first network is the IEEE802.11 network, and said second type network is IEEE 802.16 networks.
11. a method of in being arranged to the platform of implementing centralized switchover policy function, using, this method comprises:
Metrical information is sent to network switchover policy function from media independent handover layer, and said media independent handover layer is configured to communicate with IEEE 802.xx medium access control physical sublayer management and IEEE 802.xx physics physical sublayer management;
Media independent handover layer place at said platform receives the switching command from said network switchover policy function; And
Carry out the switching of make-before-break type from first network to second network in response to said switching command.
12. method according to claim 11 is characterized in that, said media independent handover layer is communicated by letter with the IEEE 802.xx LLC in the said platform.
13. method according to claim 11 is characterized in that, said first network is a cellular network, and said second network is an IEEE 802.xx network.
14. method according to claim 11 is characterized in that, said first network is the IEEE802.xx network, and said second network is a cellular network.
15. method according to claim 11 is characterized in that, said first network is an IEEE 802.xx network, and said second network is an IEEE 802.xx network.
16. method according to claim 11 is characterized in that, said first network is IEEE 802.16 networks, and said second network is IEEE 802.11 networks.
17. method according to claim 11 is characterized in that, said first network is IEEE 802.11 networks, and said second network is IEEE 802.16 networks.
18. one kind is arranged to the platform of implementing centralized switchover policy function, this platform comprises:
First communicator is configured to utilize IEEE 802.xx agreement;
The second communication device is configured to utilize second wireless communication protocol; And
Can operate with the processing unit with IEEE 802.xx protocol communication with said first communicator, wherein said IEEE 802.xx agreement is configured to utilize physical layer, medium access control layer and media independent handover layer;
Said processing unit can also be operated to combine said second wireless communication protocol to communicate by letter with second cordless communication network with said second communication device, and wherein said second wireless communication protocol is configured to utilize physical layer, medium access control layer and media independent handover layer;
Wherein said processing unit can also with the media independent handover layer of said IEEE 802.xx agreement and the media independent handover layer binding operation of said second wireless communication protocol stack, to receive portable management information from network switchover policy function.
19. platform according to claim 18 is characterized in that, said processing unit can also be operated to carry out the switching from first wireless network to second wireless network in response to said portable management information.
20. platform according to claim 10 is characterized in that, said first network is the IEEE802.xx network, and said second network is a cellular network.
21. platform according to claim 19 is characterized in that, said first network is the IEEE802.xx network, and said second network is an IEEE 802.xx network.
22. platform according to claim 19 is characterized in that, said first network is the IEEE802.11 network, and said second network is IEEE 802.16 networks.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US56901504P | 2004-05-07 | 2004-05-07 | |
| US60/569,015 | 2004-05-07 | ||
| US11/091,159 US7710923B2 (en) | 2004-05-07 | 2005-03-28 | System and method for implementing a media independent handover |
| US11/091,159 | 2005-03-28 | ||
| PCT/US2005/014705 WO2006001902A2 (en) | 2004-05-07 | 2005-05-02 | System and method for implementing a media independent handover |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1951128A CN1951128A (en) | 2007-04-18 |
| CN1951128B true CN1951128B (en) | 2012-05-09 |
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2005800145476A Expired - Fee Related CN1951128B (en) | 2004-05-07 | 2005-05-02 | System and method for implementing a media independent handover |
| CNU2005200193015U Expired - Lifetime CN2862543Y (en) | 2004-05-07 | 2005-05-08 | Wireless communication device, platform and integrated circuit implementing media independent switch |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2005200193015U Expired - Lifetime CN2862543Y (en) | 2004-05-07 | 2005-05-08 | Wireless communication device, platform and integrated circuit implementing media independent switch |
Country Status (2)
| Country | Link |
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| CN (2) | CN1951128B (en) |
| NO (1) | NO20065579L (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5889816A (en) * | 1996-02-02 | 1999-03-30 | Lucent Technologies, Inc. | Wireless adapter architecture for mobile computing |
| US6587680B1 (en) * | 1999-11-23 | 2003-07-01 | Nokia Corporation | Transfer of security association during a mobile terminal handover |
| US6651105B1 (en) * | 1998-11-12 | 2003-11-18 | International Business Machines Corporation | Method for seamless networking support for mobile devices using serial communications |
-
2005
- 2005-05-02 CN CN2005800145476A patent/CN1951128B/en not_active Expired - Fee Related
- 2005-05-08 CN CNU2005200193015U patent/CN2862543Y/en not_active Expired - Lifetime
-
2006
- 2006-12-04 NO NO20065579A patent/NO20065579L/en unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5889816A (en) * | 1996-02-02 | 1999-03-30 | Lucent Technologies, Inc. | Wireless adapter architecture for mobile computing |
| US6651105B1 (en) * | 1998-11-12 | 2003-11-18 | International Business Machines Corporation | Method for seamless networking support for mobile devices using serial communications |
| US6587680B1 (en) * | 1999-11-23 | 2003-07-01 | Nokia Corporation | Transfer of security association during a mobile terminal handover |
Also Published As
| Publication number | Publication date |
|---|---|
| CN2862543Y (en) | 2007-01-24 |
| CN1951128A (en) | 2007-04-18 |
| NO20065579L (en) | 2007-01-26 |
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