CN102281591A - Data buffer method and system thereof - Google Patents
Data buffer method and system thereof Download PDFInfo
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- CN102281591A CN102281591A CN2010102074872A CN201010207487A CN102281591A CN 102281591 A CN102281591 A CN 102281591A CN 2010102074872 A CN2010102074872 A CN 2010102074872A CN 201010207487 A CN201010207487 A CN 201010207487A CN 102281591 A CN102281591 A CN 102281591A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/56—Provisioning of proxy services
- H04L67/568—Storing data temporarily at an intermediate stage, e.g. caching
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/16—Gateway arrangements
Abstract
The invention discloses data buffer method. The method comprises the following steps that: during a switching flow caused by shift of a user equipment (UE) position, a source radio side network element notifies an L-GW to carry out data buffer; after the switching is completed, the L-GW issues the buffered data to the UE through a switched object radio side network element. In addition, the invention also discloses a data buffer system. According to the method and the system provided in the invention, privacy of local data is protected and costs of a nodeB/ home nodeB and especially of the home nodeB are reduced.
Description
Technical field
The present invention relates to moving communicating field, relate in particular to a kind of method and system of metadata cache.
Background technology
In order to keep the competitiveness of 3-G (Generation Three mobile communication system) in the communications field, speed is faster, time delay is lower, the mobile communication service of personalization more for the user provides, simultaneously, reduce operating cost of operator, third generation partner program (3GPP, 3rd Generation Partnership Project) the standard operation group just is being devoted to the research of evolved packet system (EPS, Evolved Packet System).The structure of EPS as shown in Figure 1, whole EPS is divided into wireless access network and core net two parts, in core net, comprised home subscriber server (HSS, Home Subscriber Server), Mobility Management Entity (MME, MobilityManagement Entity), service universal grouping wireless service (GPRS, General Packet RadioService) support node (SGSN, Serving GPRS Support Node), policy charging rule functional entity (PCRF, Policy and Charging Rule Function), gateway (S-GW, ServingGateway), packet data gateway (P-GW, PDN Gateway) and packet data network (PDN, PacketData Network).Introduce the each several part function below in detail:
HSS is the permanent storage place of user contracting data, is positioned at the home network that the user contracts;
MME is the storage place of user contracting data in current network, is responsible for UE to the mobile management of the safety verification of the Non-Access Stratum signaling management of network, UE, UE, tracking under user's idle pulley and paging management, bearer management;
SGSN is GERAN (GSM EDGE Radio Access Network) and global land wireless access (UTRAN, Universal Terrestrial Radio Access) the business support point of user access core network, similar on the function with MME, be responsible for user's position renewal, paging management and bearer management;
S-GW is the gateway that core net arrives wireless system, is responsible for function, Lawful Interception and grouped data route and forwarding capability that UE initiates service request to user plane bearer, the metadata cache under the UE idle pulley, the network side of core net; S-GW is responsible for adding up the situation that user terminal (UE, User Equipment) uses wireless network, and produces the ticket that UE uses wireless network, sends charging gateway to;
P-GW is the gateway of evolution system and this system's external packet data network, it is connected on internet and the packet data network, functions such as Internet protocol (IP, the Internet Protocol) address assignment of responsible UE, billing function, grouping packet filtering, policy control;
PDN is the IP operation network of operator, and this network provides IP service by the core net of operator for the user;
PCRF is a server of being responsible for providing charging control, the control of online credit, thresholding control, service quality (QoS, Quality of Service) tactful aspect rule in the evolution system;
Wireless access network (RAN, Radio Access Network) be by evolution base station (eNB, E-UTRANNodeB) and radio network controller (Radio Network Control) form, it mainly is responsible for the transmitting-receiving of wireless signal, by air interface and UE contact, Radio Resource, scheduling of resource, the access control of management air interface.
Above-mentioned SGSN is the SGSN that upgraded, can support and S-GW between the S4 interface, and and MME between adopt GPRS channel agreement (GTPv2, GPRS Tunnelling Protocol) to carry out intercommunication.And for the SGSN that supports the 3G core net, packet switching (PS, Packet Switching) the territory network architecture and Fig. 1 are different.At this moment, SGSN adopts gn interface to link to each other with MME, and the GTPv1 agreement is adopted in intercommunication.SGSN can not link to each other with S-GW, is connected to Gateway GPRS Support Node (GGSN, Gateway GPRS SupportNode) by gn interface and directly carries out the PDN visit.
Home eNodeB (HNB, Home NodeB) or the Home eNodeB (HeNB of evolution, HomeeNodeN) be small-sized, the lower powered base station of a class, dedicated resources as the certain user, being deployed in private sites such as family, group, company or school uses, mainly be in order higher service rate to be provided to the user and to reduce and use the needed expense of high rate services, remedying the deficiency that existing distributed cellular radio communication system covers simultaneously.The advantage of Home eNodeB is economical, convenient, low-power output, plug and play, broadband access, use single-mode terminal etc.
Home eNodeB can be applied in 3G or Long Term Evolution (LTE, the Long Term Evolution) mobile communications network.For the ease of Home eNodeB is managed, new network element, i.e. a femto gateway in network, have been introduced.The function that femto gateway is mainly carried out is: the fail safe of checking Home eNodeB, maintenance management is carried out in the operation of Home eNodeB, and according to Carrier Requirements configuration and control Home eNodeB, be responsible for the data message of exchcange core net and Home eNodeB.Fig. 2 shows 3G home base station network Organization Chart, and the 3G Home eNodeB is connected to femto gateway by the Iuh interface of redetermination, and femto gateway is provided to the IuPS and the IuCs interface of core network packet-domain and circuit domain.Femto gateway is essential deployment for 3G network, is used for shielding the influence of introducing behind the Home eNodeB UE and network side.The optional deployment of femto gateway for the LTE network, therefore LTE Home eNodeB and core net are connected with dual mode, a kind of is that Home eNodeB directly links to each other with core network element, and another kind is that Home eNodeB links to each other with core network element by femto gateway, respectively as shown in Figure 3, Figure 4.Scene for introducing femto gateway shown in Figure 4, femto gateway can not integrated user plane functions, directly sets up user's face between Home eNodeB and core net user plane gateway, can make the flattening of user's face like this, data transmission delay reduces, as shown in Figure 5.
Home eNodeB is except supporting by the access of mobile core network, can also support local IP access function, possess at Home eNodeB under the condition of local IP access capability and the signatory permission of user local IP access, can realize that the user inserts this locality of other IP devices of home network or internet.By local access function, can realize the shunting of Internet data service, reduce the core net load, and can not transmit the transfer of data convenient and efficient by core net for the visit of home network device.Local IP access function also can use on macrocellular, and main application and Home eNodeB are similar, more is to be applied in local IP to insert this scene of Internet, and purpose is to reduce the core net load.Fig. 6 and Fig. 7 show the framework of realizing above-mentioned local access function respectively, and main difference is embodied in whether there is femto gateway.Wherein, local access network closes (L-GW) is linked into external network (for example internet) as this locality network element, address assignment, charging, grouping packet filtering, policy control, data distribution function, NAS/ wireless access network applying portion (RANAP are provided, Radios Access Network Application Part) functions such as message parse, network address translation (NAT, Network Address Translation), local IP access strategy route and execution.L-GW both can be used as self-existent network element as a logical block when the actual deployment, also can unite deployment with existing base station from home or home base-station gateway.Realize local access architecture for macrocellular, perhaps do not have the access architecture of home base-station gateway, can realize by the framework of Fig. 7.
In above-mentioned framework, local gateway and base station/base station from home may be the third party owners who belongs to the mobile operator of association such as enterprise or family.Therefore, in order to guarantee locally-attached data privacy, should avoid the local core net that data travel back across mobile operator that connects as far as possible.
On the other hand, to set up the local influence that connects existing core network element in order reducing, between base station/base station from home, can to pass through expansion interface, directly intercorrelation information, thereby do not need the gateway of core net is transformed, to reduce the upgrade cost of network.
In the prior art, when setting up local the connection,, and insert by LTE and to set up locally-attached flow process as shown in Figure 8, mainly may further comprise the steps by expansion interface:
Step 801 is initiated attaching process (adhering to request) and is registered in the core net when UE starts shooting.This non-access layer information is encapsulated in by base station (HeNB/eNB) in the initialization user message of S1 interface and brings MME, and whether the base station also supports self the ability of local IP access (LIPA, Local IP Access) to inform core net.Insert if the UE perception is local, adhere to so and also will comprise UE in the request and wish to set up locally-attached information, this information includes but not limited to special APN (APN, Access PointName), perhaps sets up the local indication that connects.
Step 802, if there is not user's contextual information in the network, perhaps Attach Request message does not have integrity protection, perhaps integrity protection failure, MME carries out the authentication process to the user, i.e. safety/authentication/authority checking so.
Step 803～804, set up locally-attached information if UE provides in adhering to request, perhaps protocol configuration option (the PCO that provides of UE, Protocol Configuration Options) be that process is encrypted, enciphered message is obtained request message to MME and receiving encryption key obtains response message to get parms again by sending so.
Step 805 if there is not user's subscription data among the MME, then sends to HSS and upgrades location request message (position renewal), and request obtains the subscription data (subscription data obtains) of UE.
Step 806～807, MME connects for UE sets up corresponding PDN according to the request of UE and the subscription data of HSS.MME sends to L-GW by S-GW and creates conversation request message, wherein carries the UE sign, signatory QoS information; L-GW returns the establishment conversational response to S-GW, wherein carries information such as the tunnel end sign of distribution and address.
Step 808, MME is according to the information that provides (being the APN in the Attach Request message) of UE, and CAMEL-Subscription-Information or policy information (are this locality or O﹠amp; M configured strategy information), judge whether to set up local the connection (carry out local the access, do not set up the core net carrying) into UE.If judged result then is defined as UE and sets up local the connection for being, carry out subsequent step then.
Step 809, MME sends initial context to base station/base station from home and sets up request message, and comprise therein and allow for UE and set up the local local relevant information that inserts that inserts and set up, wherein, relevant information includes but not limited to that APN and MME are the global unique temporary identity (GUTI that UE distributes, or the tunnel end of L-GW sign and address information GloballyUnique Temporary Identity).Also comprise in this request to send to and adhering to of UE accept message.
Step 810, base station/base station from home send to L-GW and create conversation request, wherein carry the tunnel end sign of base station/base station from home, the tunnel end identification information that the identification information of UE or L-GW distribute.
Step 811, L-GW according to create tunnel end identification information that UE identification information in the conversation request message or L-GW distribute bind the carrying of setting up the base station with before by the relation between the carrying of S-GW foundation.
Step 812, HeNB sends RRC to UE and sets up request message, and comprises therein to adhere to and accept message.
Step 813, UE sets up RRC, and returns RRC foundation to HeNB and finish message.
Step 814, HeNB returns initial context to MME and sets up response message.
Step 815, UE sends direct-sending message to HeNB, wherein comprises to adhere to finish message.
Step 816, HeNB is by direct-sending message, will adhere to finish message and send to MME.
So far, local connection is set up and is finished.Step 810 in the said process～811 can be to carry out after step 809 or step 813 or step 815.
UE has set up after the local connection, and follow-up because meeting initiation switching is moved in the position, in the process of switching, source base station/base station from home can carry out buffer memory to data.If do not support data forwarding between base station/base station from home, data need be transmitted by core net so, and the therefore local privacy that connects data can be affected.In addition, because the restriction of the cost of base station from home own, the ability of its metadata cache also can be subjected to certain restriction.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method and system of metadata cache, with the privacy of protection local data, and the cost of reduction base station/base station from home, especially base station from home.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides a kind of method of metadata cache, this method comprises:
In user terminal (UE) position was moved the switching flow that causes, source wireless side network element notice local gateway (L-GW) carried out metadata cache;
After switching was finished, described L-GW was handed down to described UE with data in buffer by the Target Wireless side network element after switching.
Further, described source wireless side network element carries out metadata cache by newly-increased type of message notice L-GW, and perhaps modification bearing request message or the release access request message notice L-GW by expansion carries out metadata cache.
Further, described in the UE position is moved the switching flow that causes, source wireless side network element notice L-GW carries out metadata cache, is specially:
Described source wireless side network element notifies described L-GW to carry out metadata cache after initiating switching flow;
Perhaps, described source wireless side network element notifies described L-GW to carry out metadata cache after judging that local connection is set up successfully.
This method further comprises:
Described source wireless side network element sends to described Target Wireless side network element with tunnel end sign and/or the address information that described L-GW distributes, and described Target Wireless side network element carries out bearing association according to tunnel end sign and/or address information that described L-GW distributes.
This method further comprises:
The target mobile management unit sends to described Target Wireless side network element with tunnel end sign and/or the address information that L-GW distributes, and described Target Wireless side network element carries out bearing association according to tunnel end sign and/or address information that described L-GW distributes.
The present invention also provides a kind of system of metadata cache, and this system comprises: the source wireless side network element and the L-GW at UE place, wherein,
Described source wireless side network element is used for the switching flow that is moved and causes in the UE position, and notice L-GW carries out metadata cache;
L-GW is used for according to notifying of described source wireless side network element data cachedly, and after switching is finished, data in buffer is handed down to described UE by the Target Wireless side network element after switching.
Wherein, described source wireless side network element is further used for, and carries out metadata cache by newly-increased type of message notice L-GW, and perhaps modification bearing request message or the release access request message notice L-GW by expansion carries out metadata cache.
Described source wireless side network element is further used for, and after initiating switching flow, notifies described L-GW to carry out metadata cache;
Perhaps, after judging that local connection is set up successfully, notify described L-GW to carry out metadata cache.
Described source wireless side network element is further used for, and tunnel end sign and/or address information that described L-GW is distributed send to described Target Wireless side network element;
Described Target Wireless side network element carries out bearing association according to tunnel end sign and/or address information that described L-GW distributes.
This system further comprises: the target mobile management unit, and the tunnel end sign and/or the address information that are used for described L-GW is distributed send to described Target Wireless side network element;
Described Target Wireless side network element carries out bearing association according to tunnel end sign and/or address information that described L-GW distributes.
The method and system of a kind of metadata cache provided by the present invention, in the UE position was moved the switching flow that causes, source wireless side network element notice L-GW carried out metadata cache; After switching was finished, L-GW was handed down to UE with data in buffer by the Target Wireless side network element after switching.By the present invention, on the one hand can effectively avoid local data to travel back across the data privacy problem that core net is brought, also can alleviate base station/base station from home on the other hand, particularly the cost that brings of base station from home metadata cache promotes.Thereby protected the privacy of local data, also reduced base station/base station from home, especially the cost of base station from home.
Description of drawings
Fig. 1 is the structural representation of EPS in the prior art;
Fig. 2 is the configuration diagram of 3G home base station network in the prior art;
Fig. 3 is the configuration diagram one of LTE home base station network in the prior art;
Fig. 4 is the configuration diagram two of LTE home base station network in the prior art;
Fig. 5 is the configuration diagram three of LTE home base station network in the prior art;
Fig. 6 realizes the local network architecture schematic diagram one that inserts in the prior art;
Fig. 7 realizes the local network architecture schematic diagram two that inserts in the prior art;
Fig. 8 utilizes expansion interface to set up locally-attached flow chart in the prior art;
Fig. 9 is the method flow diagram of metadata cache in the embodiment of the invention one;
Figure 10 is the method flow diagram of metadata cache in the embodiment of the invention two.
Embodiment
The technical solution of the present invention is further elaborated below in conjunction with the drawings and specific embodiments.
A kind of data cache method provided by the present invention mainly comprises: in the UE position was moved the switching flow that causes, source wireless side network element notice L-GW carried out metadata cache; After switching was finished, L-GW was handed down to UE with data in buffer by the Target Wireless side network element after switching.Be that the present invention passes through in the switching flow of UE, carry out the caching process of data by L-GW instead of wireless side network element, being to travel back across the data privacy problem that core net is brought for fear of local data on the one hand, is in order to alleviate the cost lifting that wireless side network element data buffer memory is brought on the other hand.
Data cache method based on above-mentioned further describes below in conjunction with specific embodiment.
Fig. 9 utilizes the present invention to realize the embodiment one of notification data buffer memory.This embodiment does not limit base station type, and promptly base station from home or ordinary base station can.Being example with the base station from home during flow process is described, is identical to the influence of ordinary base station.Present embodiment goes for the situation that LTE inserts or UTRAN/GERAN inserts, and inserts for LTE, and base station from home/base station is HeNB/eNB, and mobile management unit is MME; Insert for UTRAN/GERAN, base station from home/base station is HNB/ radio network controller (RNC, Radio Network Controller), and mobile management unit is SGSN.And the core net gateway refers to the GGSN/S-GW/P-GW that is positioned at core net.For the scene of base station from home, may there be home base-station gateway in the network, if there is home base-station gateway, the message between all base station from home and the mobile management unit all needs through home base-station gateway so.Further the message between base station from home and the L-GW both can be passed through home base-station gateway, also can not pass through home base-station gateway.For the scene of transmitting message by home base-station gateway, home base-station gateway carries out transparent transmission to the message of process.
This embodiment is equally applicable to the scene that S-GW changes, but changes message or the flow change of bringing because summary of the invention of the present invention does not relate to S-GW, does not therefore do herein and gives unnecessary details.
As shown in Figure 9, before the execution switching flow, the user has set up local connection, and has set up direct tunnel between source base station from home and the L-GW.Data path before switching is:
The flow process of switching mainly may further comprise the steps:
Step 901, the source base station from home is initiated switching flow, and requires the UE reporting measurement reports.
Step 902, the source base station from home sends the metadata cache notification message to L-GW, wherein carries the carrying tabulation that needs buffer memory, the perhaps identification information that connects of PDN, perhaps buffer memory indication.
The present invention does not limit the specific implementation of this notification message, can realize by increasing new type of message; Also can realize by expanding existing modification bearing request message or discharging the access request message.
Step 903, after L-GW received the metadata cache notification message, the data of local cache relevant bearer promptly no longer sent data to the source base station from home.
Step 904, after the source base station from home has been selected target home base station, send handoff request message to the source mobile management unit, wherein comprise the bearing identification of target home base station sign/Target Cell Identifier, target following district/Routing Area Identifier, UE, the information such as container that the source base station from home need pass through target home base station.Wherein can comprise the tunnel end sign that L-GW distributes in the information of container.
Step 905, source mobile management unit send to the target mobile management unit and transmit RELOCATION REQUEST message, wherein carry the contextual information of UE.
Because UE set up local connection, then also need to comprise information such as the address of the address of S-GW and tunnel end sign, L-GW and tunnel end sign in the contextual information.
Step 906, target mobile management unit judge whether to reselect S-GW, and being judged to be in the present embodiment does not need.The target mobile management unit sends handoff request to target home base station, wherein carries the address of S-GW and address and the tunnel end of tunnel end sign and/or L-GW and identifies to target BS.
The address of L-GW and tunnel end sign is mainly used in target home base station and does bearing association, and it is included in the source base station from home and issues in the information of container of target home base station, and/or is included in the target mobile management unit and issues in the handoff request of target home base station.
Step 907, target home base station is returned handoff request acknowledgment message to the target mobile management unit, wherein carries successfully beared information of setting up and the beared information of setting up failure, and the information of container that returns to the source base station from home of target home base station.
Step 908, the target mobile management unit returns the forwarding relocation response message to the source mobile management unit, wherein carries beared information that merit sets up and the beared information of setting up failure, and the information of container that returns to the source base station from home of target home base station.
Step 909, the source mobile management unit returns switching command to the source base station from home, wherein carries beared information that merit sets up and the beared information of setting up failure, and the information of container that returns to the source base station from home of target home base station.
Step 910, the source base station from home sends switching command information to UE, and notice UE carries out the path and switches.
Step 911, UE switches to objective network, sends to target home base station and switches the request of finishing.
Step 912, target BS sends the switching notice request to the target mobile management unit, wherein carries following at least a information: the address of the Base Station Identification of the current access of UE, tracking area/Routing Area Identifier, cell ID, target BS and user's face tunnel end sign.
Step 913, target mobile management unit send to S-GW and revise the carrying request, wherein carry the user's face address and the tunnel end sign of target BS.Reporting position information if desired, S-GW also need to send the carrying request of revising to L-GW.
Step 914, L-GW returns to S-GW and revises the carrying response, and S-GW returns to the target mobile management unit and revises the carrying response.
Step 915, target home base station send to L-GW and revise the carrying request, wherein carry address and the tunnel end sign of L-GW, and information such as the address of target home base station and tunnel end sign.
Step 916, L-GW switch data routed path sends data by the route after upgrading.Routed path after the renewal is:
Step 917, L-GW sends to target home base station and revises bearing response message.
Need to prove that step 915～917 are carried out after step 911.Present embodiment is equally applicable to the scene that mobile management unit does not change.If mobile management unit does not change, then above-mentioned source mobile management unit and target mobile management unit are same network element, and interactive signaling can be omitted between active mobile management unit of institute and the target mobile management unit.
Figure 10 utilizes the present invention to realize the embodiment two of notification data buffer memory.This embodiment does not limit base station type, and promptly base station from home or ordinary base station can.Being example with the base station from home during flow process is described, is identical to the influence of ordinary base station.Present embodiment goes for the situation that LTE inserts or UTRAN/GERAN inserts, and inserts for LTE, and base station from home/base station is HeNB/eNB, and mobile management unit is MME; Insert for UTRAN/GERAN, base station from home/base station is HNB/RNC, and mobile management unit is SGSN.And the core net gateway refers to the GGSN/SGW/PGW that is positioned at core net.For the scene of base station from home, may there be home base-station gateway in the network, if there is home base-station gateway, the message between all base station from home and the mobile management unit all needs through home base-station gateway so.Further the message between base station from home and the L-GW can be passed through home base-station gateway, also can not pass through home base-station gateway.For the scene of transmitting message by home base-station gateway, home base-station gateway carries out transparent transmission to the message of process.
This embodiment is equally applicable to the scene that S-GW changes, but changes message or the flow change of bringing because summary of the invention of the present invention does not relate to S-GW, does not therefore do herein and gives unnecessary details.
As shown in figure 10, before the execution switching flow, the user has set up local connection, and has set up direct tunnel between source base station from home and the L-GW.Data path before switching is:
The flow process of switching mainly may further comprise the steps:
Step 1001, the source base station from home is initiated switching flow, and requires the UE reporting measurement reports.
The process that carry out step 1002～1007, similar with step 904～909 among the embodiment one, no longer be repeated in this description herein.
Step 1008, source base station from home judge whether this locality connection sets up success, and send the metadata cache notification message to L-GW when judgement is set up successfully, wherein carry the carrying tabulation that needs buffer memory, or the identification information of PDN connection, or buffer memory is indicated.
The present invention does not limit the specific implementation of this notification message, can realize by increasing new type of message; Also can realize by expanding existing modification bearing request message or discharging the access request message.
Step 1009, after L-GW received the metadata cache notification message, the data of local cache relevant bearer promptly no longer sent data to the source base station from home.
The process that carry out step 1010～1017, similar with step 910～917 among the embodiment one, repeat no more herein.
Need to prove that present embodiment is equally applicable to the scene that mobile management unit does not change.If mobile management unit does not change, then above-mentioned source mobile management unit and target mobile management unit are same network element, and interactive signaling can be omitted between active mobile management unit of institute and the target mobile management unit.
The method of corresponding above-mentioned metadata cache, the present invention also provides a kind of system of metadata cache, comprising: the source wireless side network element and the L-GW at UE place.Wherein, source wireless side network element is used for the switching flow that is moved and causes in the UE position, and notice L-GW carries out metadata cache; L-GW is used for according to notifying of source wireless side network element data cachedly, and after switching is finished, data in buffer is handed down to UE by the new route after switching.
Preferable, source wireless side network element can carry out metadata cache by newly-increased type of message notice L-GW, also can carry out metadata cache by the modification bearing request message or the release access request message notice L-GW of expansion.
Source wireless side network element can be after initiating switching flow, and notice L-GW carries out metadata cache; Also can be after judging that local connection is set up successfully, notice L-GW carries out metadata cache.
In addition, in switching flow, tunnel end sign and/or address information that source wireless side network element or target mobile management unit also need L-GW is distributed send to the target side network element, thereby Target Wireless side network element can carry out bearing association according to tunnel end sign and/or address information that L-GW distributes.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (10)
1. the method for a metadata cache is characterized in that, this method comprises:
In user terminal (UE) position was moved the switching flow that causes, source wireless side network element notice local gateway (L-GW) carried out metadata cache;
After switching was finished, described L-GW was handed down to described UE with data in buffer by the Target Wireless side network element after switching.
2. according to the method for the described metadata cache of claim 1, it is characterized in that, described source wireless side network element carries out metadata cache by newly-increased type of message notice L-GW, and perhaps modification bearing request message or the release access request message notice L-GW by expansion carries out metadata cache.
3. according to the method for claim 1 or 2 described metadata caches, it is characterized in that described in the UE position is moved the switching flow that causes, source wireless side network element notice L-GW carries out metadata cache, is specially:
Described source wireless side network element notifies described L-GW to carry out metadata cache after initiating switching flow;
Perhaps, described source wireless side network element notifies described L-GW to carry out metadata cache after judging that local connection is set up successfully.
4. according to the method for claim 1 or 2 described metadata caches, it is characterized in that this method further comprises:
Described source wireless side network element sends to described Target Wireless side network element with tunnel end sign and/or the address information that described L-GW distributes, and described Target Wireless side network element carries out bearing association according to tunnel end sign and/or address information that described L-GW distributes.
5. according to the method for claim 1 or 2 described metadata caches, it is characterized in that this method further comprises:
The target mobile management unit sends to described Target Wireless side network element with tunnel end sign and/or the address information that L-GW distributes, and described Target Wireless side network element carries out bearing association according to tunnel end sign and/or address information that described L-GW distributes.
6. the system of a metadata cache is characterized in that, this system comprises: the source wireless side network element and the L-GW at UE place, wherein,
Described source wireless side network element is used for the switching flow that is moved and causes in the UE position, and notice L-GW carries out metadata cache;
L-GW is used for according to notifying of described source wireless side network element data cachedly, and after switching is finished, data in buffer is handed down to described UE by the Target Wireless side network element after switching.
7. according to the system of the described metadata cache of claim 6, it is characterized in that, described source wireless side network element is further used for, carry out metadata cache by newly-increased type of message notice L-GW, perhaps modification bearing request message or the release access request message notice L-GW by expansion carries out metadata cache.
8. according to the system of claim 6 or 7 described metadata caches, it is characterized in that described source wireless side network element is further used for, after initiating switching flow, notify described L-GW to carry out metadata cache;
Perhaps, after judging that local connection is set up successfully, notify described L-GW to carry out metadata cache.
9. according to the system of claim 6 or 7 described metadata caches, it is characterized in that described source wireless side network element is further used for, tunnel end sign and/or address information that described L-GW is distributed send to described Target Wireless side network element;
Described Target Wireless side network element carries out bearing association according to tunnel end sign and/or address information that described L-GW distributes.
10. according to the system of claim 6 or 7 described metadata caches, this system further comprises: the target mobile management unit, and the tunnel end sign and/or the address information that are used for described L-GW is distributed send to described Target Wireless side network element;
Described Target Wireless side network element carries out bearing association according to tunnel end sign and/or address information that described L-GW distributes.
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| CN2010102074872A CN102281591A (en) | 2010-06-13 | 2010-06-13 | Data buffer method and system thereof |
| PCT/CN2011/074602 WO2011157100A1 (en) | 2010-06-13 | 2011-05-24 | Method and system for caching data |
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