CN103415047A - Mobility supporting method in content center network - Google Patents
Mobility supporting method in content center network Download PDFInfo
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Abstract
The invention discloses a mobility supporting method in a content center network. The mobility supporting method comprises a user mobility supporting mechanism and a content source mobility supporting mechanism. In the user mobility supporting mechanism, when user moving switching is about to begin, request information of the kind that 'a user begins to move' is sent to an original access router; in a user moving switching process, the original access router caches data information sent to a user original position; after user moving switching is completed, the original access router is updated and transmits the cached data information to a user new position. In the content source mobility supporting mechanism, when content source moving switching is about to begin, request information of the kind that 'a content source begins to move' is sent to the original access router; in a content source moving switching process, the original access router caches request information sent to a content source original position; after content source moving switching is completed, the original access router is updated and transmits the cached request information sent to the content source original position to a content source new position.
Description
Technical field
The present invention relates to technical field of the computer network, relate in particular to the mobile support method in a kind of content center network.
Background technology
Be different from the conventional internet centered by main frame, the content center network attention centered by content be content itself, it can pass through content name, and content is identified, and also can pass through content name, realizes separating of content and content location.In the content center network, the user is forwarded to the particular host that has this content without the request by content, only adopts content-based routing forwarding mechanism, can fetch corresponding content from the adjacent node that this content is provided.In addition, the content center network also can be accelerated the response time of other user's access cache content in network by the buffer memory of node to content, improves the utilance of Internet resources.At present, in the content center network research, the network architecture of main flow is NDN(Named Data Networking).
NDN adopts the communication pattern of " user's driving ".The user is to the available link be attached thereto, and forwards request message for request content (mainly comprise 3 options: content name, to alternative condition and the random number of content); In the NDN network, receive arbitrarily this request message and the NDN node of this request message institute request content can be provided, all will be along the forward-path of request message, oppositely forward a data-message that comprises requested content (mainly comprise 4 options: content name, signature, signature information and requested content) to the user who asks this content; Simultaneously, the NDN node on the data-message forward-path, also will be according to cache policy and the cache resources of self, its data-message received of buffer memory.
, as an emerging network architecture, there is comparatively serious mobility support problem in NDN.On the one hand, because user's primary access router can't be known the mobile status that the user is current, so user's mobile switching will cause this couple in router to mail to the loss of the data-message of user's original position; User's mobile switching because moving in handoff procedure, the user remains open state with network, so will cause the user to mail to the loss of the request message of network; Because upgrading, the forwarding information base of each node in network needs the regular hour, after moving and switched, the user can't effectively utilize the content of adjacent node buffer memory, so user's mobile switching will be introduced long mobile handover delay, the user moves switching and experiences poor.On the other hand, because the primary access router of content source can't be known the mobile status that content source is current, so the mobile switching of content source will cause this couple in router to mail to the loss of the request message of content source original position; Because the forwarding information base of each node in network upgrades, need the regular hour, the user can't obtain immediately content source the content provided after switching is provided, so the mobile switching of content source will be introduced long mobile handover delay, it is poor that the user moves switching experience.
The user mobility support issue existed for solving existing NDN network, Jihoon Lee etc. have proposed a kind of mobility management mechanism based on the agency, by introducing subscriber proxy server, the content of user's request before mobile switching are carried out to buffer memory.This mechanism can effectively avoid the user to move the loss of switching the data-message caused, and can shorten to a certain extent the user and move the mobile handover delay that switching is introduced, and improves user's mobile the switching and experiences.But on the one hand, this mechanism can't avoid the user to move the loss of switching the request message caused; On the other hand, this mechanism still need be by traditional IP network, but just the mobile control message between the completing user acting server is mutual.
The content source mobility support problem existed for solving existing NDN network, Frederik Hermans etc. has proposed the mobility support mechanism of separating with sign a kind of position, by introducing HR(Home Repository by name) mobile agent, to content source, can provide the name prefix of content and corresponding positional information thereof to carry out buffer memory.This mechanism can effectively avoid content source to move the loss of switching the request message caused, and can shorten to a certain extent content source and move the mobile handover delay that switching is introduced, and improves user's mobile the switching and experiences.But, because user's request message need be forwarded to the content source that requested content can be provided by mobile agent, so when mobile agent is not on the shortest path of user and content source, this mechanism will increase user's the content obtaining time to a certain extent, the bandwidth resources of waste network.
Summary of the invention
The purpose of this invention is to provide the mobile support method in a kind of content center network.
In order to solve the prior art problem, the invention discloses the mobile support method in a kind of content center network, comprise user mobility support scheme and content source mobility support mechanism.
The user mobility support scheme comprises the following steps:
The user moves switching while being about to start, and user's transmission types to its primary access router, impels its primary access router to upgrade that this user has asked but the required list entry undetermined of not obtaining content for the request message of " user moves beginning "; Simultaneously, the user stops transmission types and is the network that the request message of " common " is about to leave to the user, and avoiding the user to move switching, to cause type be the loss of the request message of " common ";
The user moves in handoff procedure, and its primary access router is according to the required list entry undetermined after upgrading, and buffer memory mails to the data-message of the type of user's original position for " common ", avoids the user to move the loss that switching causes data-message;
After the user moves and has switched, transmission types is that the request message of " mobile retransmit " is to its primary access router, impel the data-message that its primary access router is " common " by the type of buffer memory to be updated to the data-message of type for " the mobile re-transmission ", and be forwarded to the reposition after the user moves switching.
Further, as preferably, also comprise:
After this, user's transmission types extremely can provide the content source of requested content for the request message of " common "; Content source forwards the type comprise requested content and moves the reposition after switching for the data-message of " common " to the user.
Content source mobility support mechanism comprises the following steps:
Content source moves switching while being about to start, and transmission types to its primary access router, impels its primary access router to upgrade the forwarding information base entry that this content source can provide content for the request message of " content source moves beginning ";
Content source moves in handoff procedure, and its primary access router is according to the forwarding information base entry after upgrading, and buffer memory mails to the request message of the type of content source original position for " common ", avoids content source to move the loss that switching causes request message;
After content source moves and has switched, transmission types for the request message of " content source has moved " to its primary access router, impel type that its primary access router will mail to the content source original position to be updated to the request message of type for " the mobile re-transmission " for the request message of " common ", and be forwarded to the reposition after content source moves switching;
Content source receives the request message of type for " mobile forward ", forward the type that comprises requested content for the data-message of " the mobile forwarding " to the user who asks this content.
Further, as preferably, also comprise:
After this, user's transmission types moves the reposition after switching for request message to the content source of " common "; Content source forward the type comprise requested content for the data-message of " common " to the user who asks this content.
The present invention, by adopting user and content source mobility support mechanism, can reduce user or content source and move the mobile handover delay that switching is introduced, and saves the bandwidth resources of network, and the mobile switching that promotes the user is experienced.
The accompanying drawing explanation
When considered in conjunction with the accompanying drawings, by the detailed description with reference to following, can more completely understand better the present invention and advantage thereof.Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a part of the present invention, and schematic description and description of the present invention the present invention does not form inappropriate limitation of the present invention for explaining, wherein:
Fig. 1 is embodiment of the present invention user mobility support scheme flow chart.
Fig. 2 is embodiment of the present invention content source mobility support mechanism flow chart.
Fig. 3 is embodiment of the present invention user mobility support scheme schematic diagram.
Fig. 4 is embodiment of the present invention content source mobility support schematic diagram of mechanism.
Fig. 5 (a) is embodiment of the present invention request message format schematic diagram.
Fig. 5 (b) is embodiment of the present invention data message format schematic diagram.
Fig. 6 (a) is embodiment of the present invention content memorizer form schematic diagram.
Fig. 6 (b) is embodiment of the present invention required list form undetermined schematic diagram.
Fig. 6 (c) is embodiment of the present invention forwarding information library format schematic diagram.
Fig. 7 (a) is embodiment of the present invention request message handling process schematic diagram.
Fig. 7 (b) is embodiment of the present invention data-message handling process schematic diagram.
Fig. 8 (a) is the message interaction process schematic diagram of embodiment of the present invention user mobile context.
Fig. 8 (b) is the message interaction process schematic diagram of embodiment of the present invention content source mobile context.Fig. 9 is the embodiment of the present invention one user's mobile context schematic diagram.
Figure 10 is the embodiment of the present invention two content source mobile context schematic diagrames.
Embodiment
With reference to Fig. 1-10 pair embodiments of the invention, describe.
For above-mentioned purpose, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
The invention provides the mobile support method in a kind of content center network, can solve user mobility support issue and content source mobility support problem in existing content center network.Described method is comprised of user mobility support scheme and content source mobility support mechanism two parts.
As shown in Figure 1, a kind of user mobility support scheme, this mechanism comprises the following steps:
S11, user move switching and be about to start step: user's transmission types to its primary access router, impels its primary access router to upgrade that this user has asked but the required list entry undetermined of not obtaining content for the request message of " user moves beginning "; Simultaneously, the user stops transmission types and is the network that the request message of " common " is about to leave to the user, and avoiding the user to move switching, to cause type be the loss of the request message of " common ";
S12, user move step in handoff procedure: user's primary access router is according to the required list entry undetermined after upgrading, and buffer memory mails to the data-message of the type of user's original position for " common ", avoids the user to move the loss that switching causes data-message;
S13, user move has switched rear step: user's transmission types for the request message of " mobile retransmit " to its primary access router, impel the data-message that its primary access router is " common " by the type of buffer memory to be updated to the data-message of type for " the mobile re-transmission ", and be forwarded to the reposition after the user moves switching.
After this, user's transmission types extremely can provide the content source of requested content for the request message of " common "; Content source forwards the type comprise requested content and moves the reposition after switching for the data-message of " common " to the user.
As shown in Figure 2, a kind of content source mobility support mechanism, this mechanism comprises the following steps:
S21, content source move switching and be about to start step: the content source transmission types to its primary access router, impels its primary access router to upgrade the forwarding information base entry that this content source can provide content for the request message of " content source moves beginning ";
S22, content source move step in handoff procedure: the primary access router of content source is according to the forwarding information base entry after upgrading, buffer memory mails to the request message of the type of content source original position for " common ", avoids content source to move the loss that switching causes request message;
S23, content source move has switched rear step: the content source transmission types for the request message of " content source has moved " to its primary access router, impel type that its primary access router will mail to the content source original position to be updated to the request message of type for " the mobile re-transmission " for the request message of " common ", and be forwarded to the reposition after content source moves switching;
Content source receives the request message of type for " mobile forward ", forward the type that comprises requested content for the data-message of " the mobile forwarding " to the user who asks this content.
After this, user's transmission types moves the reposition after switching for request message to the content source of " common "; Content source forward the type comprise requested content for the data-message of " common " to the user who asks this content.
User mobility support scheme schematic diagram is as shown in Figure 3, specific as follows:
Step 301, the user moves switches while being about to start, and send a request message (type is " user moves beginning "), to its primary access router, impels its primary access router to upgrade relevant required list undetermined; Simultaneously, the user stops sending a request message (type is " common ") to its network that is about to leave, and avoids the user to move the loss that switching causes request message;
Step 302, the user moves in handoff procedure, and its primary access router is according to the required list undetermined after upgrading, and buffer memory mails to the data-message (type is " common ") of user's original position, avoids the user to move the loss that switching causes data-message;
Step 303-304, after the user moves and has switched, send a request message (type is " the mobile re-transmission ") to its primary access router, impel its primary access router to upgrade and the data-message (type is " the mobile re-transmission ") of forwarding cache moves the reposition after switching to the user, and shorten whereby the user and move the mobile handover delay that switching is introduced, the mobile switching that promotes the user is experienced;
Step 305-306, after this, the user sends a request message (type is " common ") to the content source that requested content can be provided; Content source forwards the data-message (type is " common ") comprise requested content and moves the reposition after switching to the user.So, user and content source can be by the interactive communications of common request message and data-message, and the user that further continues moves the content requests before switching and obtains.
Content source mobility support schematic diagram of mechanism is as shown in Figure 4, specific as follows:
Step 401, content source move to be switched while being about to start, and send a request message (type is " content source moves beginning "), to its primary access router, impels its primary access router to upgrade relevant forwarding information base;
Step 402, content source move in handoff procedure, and its primary access router is according to the forwarding information base after upgrading, and buffer memory mails to the request message (type is " common ") of content source original position, avoids content source to move the loss that switching causes request message;
After step 403, content source moved and switched, content source sent a request message (type is " content source has moved ") to its primary access router, impelled its new couple in router to add to primary access router or upgraded relevant forwarding information base;
Step 404, the primary access router of content source receives the request message of step 403, upgrades and forwards the reposition after the request message that mails to the content source original position (type is " the mobile forwarding ") to content source moves switching;
Step 405, content source receive the request message of step 404, and forwarding comprises the data-message (type is " the mobile forwarding ") of requested content to the user who asks this content.The user, without waiting for that the whole network forwarding information base has upgraded, can obtain content source the content provided after switching is provided, and whereby, can shorten to a certain extent content source and move the mobile handover delay that switching is introduced, and the mobile switching that promotes the user is experienced;
Step 406-407, after this, user's (type for " common ") to content source that sends a request message moves the reposition after switching; The content source forwarding comprises the data-message (type is " common ") of requested content to the user who asks this content.So, user and content source can be by the interactive communications of common request message and data-message, and the content source that further continues moves the content requests before switching and obtains.
The type of message that mobile support method in the foregoing central site network relates to, data structure, Message Processing flow process and message interaction process are specific as follows.
Type of message
Mobile support method in the content center network that the embodiment of the present invention provides comprises the message of 2 types: request message and data-message, as accompanying drawing 5(a), 5(b) as shown in.
Request message mainly comprises 4 options: content name, alternative condition, random number and option, and as shown in Fig. 5 (a).Wherein, the requested content of content name option sign, the alternative condition option indicates the content choice conditions such as priority ordering, content source filtration, content choice scope, the random number option forwards for the circulation of avoiding request message, and option provides the extend information that type, application message etc. are added according to actual demand.
In the present invention, when the type of request message was " common ", " the mobile re-transmission " or " the mobile forwarding ", application message was " station location marker that requested content is current "; The type of request message is when " user moves beginnings ", and application message is " station location marker of user's primary access router " and " user has asked but the content name of the content of failing to obtain "; When the type of request message was " content source moves beginning ", application message was " station location marker of the primary access router of content source " and " content name of the available content of content source "; When the type of request message was " content source has moved ", application message was " station location marker of the primary access router of content source ", " content name of the available content of content source " and " station location marker of the new couple in router of content source ".
Data-message mainly comprises 5 options: content name, signature, signature information, content and option, and as shown in Fig. 5 (b).Wherein, the requested content of content name option sign, signature option is for realizing the source authentication of content, the signature information option provides the content signature information such as content source sign, key location, expired time, content options comprises requested content, and option provides the extend information that type, application message etc. are added according to actual demand.
In the present invention, when the type of data-message was " common ", " the mobile re-transmission " or " the mobile forwarding ", application message was " station location marker that requested content is current ".
Data structure
Mobile support method in the content center network that the embodiment of the present invention provides comprises the data structure of 3 types: content memorizer, required list undetermined and forwarding information base, as accompanying drawing 6(a)-6(c) as shown in.
Content memorizer is stored the available content of this node, mainly comprises 3 options: content name, content and life span, and as shown in Fig. 6 (a).The data-message buffer memory that comprises requested content that node in the content center network can receive it is to the content memorizer of this node, to reduce the response time of other this content of node visit in the content center network, improve the contents distribution efficiency of content center network.
Required list undetermined records this node and receives but also fail the request message state be consumed, and mainly comprises 3 options: content name, entrance list and life span, and as shown in Fig. 6 (b).When the mobile status flag bit that in the entrance list, interface is corresponding is " 0 ", ask the user of this entry corresponding content and this node to be in connection status; When the mobile status flag bit that in the entrance list, interface is corresponding is " 1 ", ask the user of this entry corresponding content and this node to be in off-state; The mobile status flag bit that in the entrance list, interface is corresponding is defaulted as " 0 ".The content center network can be forwarded to according to the data-message that required list undetermined will comprise requested content the node of this content of request.
Forwarding information base records the optional forward-path of request message that this node receives, and mainly comprises 3 options: content name or station location marker, outlet list and life span, and as shown in Fig. 6 (c).When in the outlet list, mobile status flag bit corresponding to interface was " 0 ", content source and the network of this entry corresponding content were in connection status; When in the outlet list, mobile status flag bit corresponding to interface was " 1 ", content source and the network of this entry corresponding content were in off-state; In the outlet list, mobile status flag bit corresponding to interface is defaulted as " 0 ".The content center network can will be forwarded to for the request message of request content the node that this content can be provided according to forwarding information base.
The Message Processing flow process
Mobile support method in the content center network that the embodiment of the present invention provides comprises the Message Processing flow process of 2 types: request message handling process and data-message handling process, as Fig. 7 (a), 7(b) as shown in.
The request message handling process is as shown in Fig. 7 (a).
1. type is the request message handling process of " common ", " the mobile re-transmission " or " the mobile forwarding ":
Whether step 11, exist the entry of coupling according to the content memorizer of the longest prefix match principle decision node of content name.If, execution step 12; If not, execution step 13.
Step 12, structure comprises the data-message of requested content, and by the interface that receives request message, forwards the data-message of neotectonics, abandons simultaneously the request message received.
Whether step 13, exist the entry of coupling according to the required list undetermined of the longest prefix match principle decision node of content name.If, execution step 14; If not, execution step 15.
Step 14, upgrade required list coupling entry undetermined (will receive the interface of request message and the entrance list that corresponding mobile status flag bit is added into required list coupling entry undetermined thereof), and abandon the request message received.
Whether step 15, successively exist the entry of coupling according to the forwarding information base of the longest prefix match principle decision node of station location marker (" station location marker that requested content is current " that request message comprises) and content name.If, execution step 16; If not, execution step 17.
Step 16, judge whether forwarding information base coupling entry exists the mobile status flag bit.If, execution step 18; If not, execution step 19.
Step 17, node think that the purpose of request message is unreachable, abandon the request message received.
Step 18, judge whether the mobile status flag bit of forwarding information base coupling entry is 0.If, execution step 110; If not, execution step 111.
Step 110, judge whether the station location marker of forwarding information base coupling entry is consistent with " station location marker that requested content is current " that request message comprises.If, execution step 112; If not, execution step 113.
Step 112, upgrade required list undetermined (adding the undetermined required list entry corresponding with requested content), and forward according to the outlet list of forwarding information base coupling entry and the forwarding strategy (be defaulted as the Best-Route strategy, namely select the outlet that priority is the highest the request message received along optimum path forward node) of this node the request message received.
2. type is the request message handling process of " user moves beginning ":
" station location marker of user's primary access router " that step 21, the station location marker of comparison node and request message comprise, judge whether this node is user's primary access router.If, execution step 22; If not, execution step 23.
Step 22, " user has asked but the content name of the content of failing to obtain " comprised according to request message, upgrade that this user has asked but the required list entry undetermined (mobile status mark position that will be corresponding with the interface that receives this request message is " 1 ") of not obtaining content, and abandon the request message received.
It is wrong that step 23, node think that this request message forwards, and abandons the request message received.
3. type is the request message handling process of " content source moves beginning ":
" station location marker of the primary access router of content source " that step 31, the station location marker of comparison node and request message comprise, judge whether this node is the primary access router of content source.If, execution step 32; If not, execution step 33.
Step 32, " content name of the available content of content source " comprised according to request message, upgrade the forwarding information base entry (mobile status mark position that will with the interface that receives this request message corresponding be " 1 ") corresponding with the available content of content source, and abandon the request message received.
It is wrong that step 33, node think that this request message forwards, and abandons the request message received.
4. type is the request message handling process of " content source has moved ":
" station location marker of the primary access router of content source " that step 41, the station location marker of comparison node and request message comprise, judge whether this node is the primary access router of content source.If, execution step 42; If not, execution step 43.
" station location marker of the new couple in router of content source " that step 43, the station location marker of comparison node and request message comprise, judge whether this node is the new couple in router of content source.If, execution step 46; If not, execution step 47.
Whether step 47, exist the entry of coupling according to the forwarding information base of the longest prefix match principle decision node of station location marker (" station location marker of the primary access router of content source " that request message comprises).If, execution step 48; If not, execution step 49.
The data-message handling process is as shown in Fig. 7 (b).
Type is the data-message handling process of " common ", " the mobile re-transmission " or " the mobile forwarding ":
Whether step 51, exist the entry of coupling according to the content memorizer of the longest prefix match principle decision node of content name.If, execution step 52; If not, execution step 53.
Whether step 53, exist the entry of coupling according to the required list undetermined of the longest prefix match principle decision node of content name.If, execution step 54; If not, execution step 55.
Step 55, node think request receiving not to the content that comprises of data-message, abandon the data-message received.
The data-message that step 56, buffer memory receive is to the content memorizer of node, and forwards according to the entrance list of required list coupling entry undetermined the data-message received, and deletes simultaneously required list coupling entry undetermined.
Message interaction process
Mobile support method in the content center network that the embodiment of the present invention provides comprises the message interaction process of 2 types: the message interaction process of the message interaction process of user's mobile context and content source mobile context, as Fig. 8 (a), 8(b) as shown in.
The message interaction process of user's mobile context is as shown in Fig. 8 (a).
5. the user moves and switches while being about to start:
Step 81, the user sends a request message, and (type is " user moves beginning "; Application message is " station location marker of user's primary access router " and " user has asked but the content name of the content of failing to obtain ") to its primary access router, impel its primary access router to upgrade that this user has asked but the required list entry undetermined (mobile status mark position that will be corresponding with the interface that receives this request message is " 1 ") of not obtaining content; Simultaneously, the user stops sending a request message, and (type is " common "; Application message is the station location marker of the couple in router of content source for " station location marker that requested content is current ") to its network that is about to leave.
6. the user moves in handoff procedure:
Step 82, user's primary access router be according to the required list entry undetermined (the mobile status flag bit be " 1 ") after upgrading, and buffer memory mails to the data-message of user's original position, and (type is " common "; Application message is the station location marker of the couple in router of content source for " station location marker that requested content is current ").
7. after the user moves and has switched:
Step 83, the user sends a request message, and (type is " the mobile re-transmission "; Application message is the station location marker of user's primary access router for " station location marker that requested content is current ") to its primary access router.
Step 84, user's primary access router receives the request message of step 83, and the data-message that upgrades buffer memory (is set to type " the mobile re-transmission "; Application message being set to " station location marker that requested content is current " is the station location marker of user's primary access router), and the data-message after further upgrading is forwarded to the reposition after the user moves switching.
Step 85-86, after this, the user sends a request message, and (type is " common "; Application message is the station location marker of the couple in router of content source for " station location marker that requested content is current ") to the content source that requested content can be provided; Content source forwards the data-message that comprises requested content, and (type is " common "; Application message is the station location marker of the couple in router of content source for " station location marker that requested content is current ") move the reposition after switching to the user.
The message interaction process of content source mobile context is as shown in Fig. 8 (b).
8. content source moves and switches while being about to start:
Step 91, content source send a request message, and (type is " content source moves beginning "; Application message is " station location marker of the primary access router of content source " and " content name of the available content of content source ") to its primary access router, impel its primary access router to upgrade the forwarding information base entry corresponding with the available content of content source (mobile status mark position that will be corresponding with the interface that receives this request message is " 1 ").
9. content source moves in handoff procedure:
Step 92, the primary access router of content source be according to the forwarding information base entry (the mobile status flag bit be " 1 ") after upgrading, and buffer memory mails to the request message of content source original position, and (type is " common "; Application message is the station location marker of the primary access router of content source for " station location marker that requested content is current ").
10. after content source moves and has switched:
Step 93, content source send a request message, and (type is " content source has moved "; Application message is " station location marker of the primary access router of content source ", " content name of the available content of content source " and " station location marker of the new couple in router of content source ") to its primary access router.During the new couple in router of this request message approach content source, impel this couple in router to add the forwarding information base entry corresponding with the available content of content source; When this request message is forwarded to the primary access router of content source, impels this couple in router to upgrade the forwarding information base entry corresponding with the available content of content source and (outlet is set to " interface that receives this request message "; By the mobile status mark position, be " 0 "; Station location marker is set to " station location marker of the new couple in router of content source ").
Step 94, the primary access router of content source receives the request message of step 93, upgrades the request message that mails to the content source original position and (type is set to " the mobile forwarding "; Application message being set to " station location marker that requested content is current " is the station location marker of the new couple in router of content source), and the request message after further upgrading is forwarded to the reposition after content source moves switching.
Step 95, content source receive the request message of step 94, and (type is " the mobile forwarding " to forward the data-message that comprises requested content; Application message is the station location marker of the new couple in router of content source for " station location marker that requested content is current ") to the user who asks this content.
Step 96-97, after this, the user sends a request message, and (type is " common "; Application message is the station location marker of the new couple in router of content source for " station location marker that requested content is current ") move the reposition after switching to content source; Content source forwards the data-message that comprises requested content, and (type is " common "; Application message is the station location marker of the new couple in router of content source for " station location marker that requested content is current ") to the user who asks this content.
Embodiment mono-
The embodiment of the present invention provides the user mobility support scheme in a kind of content center network, can effectively avoid the user to move the loss that switching causes request message and data-message, and can shorten to a certain extent the user and move the mobile handover delay that switching is introduced, improve user's mobile switching and experience.
User's mobile context schematic diagram under this mechanism as shown in Figure 9, referring to table 1, user ALICE is in the process of video/as3/ar3/iplab/toalice.avi/v1 that view content source IPLAB provides, primary access router from couple in router AR1(user, station location marker is/as1/ar1) the mobile new couple in router that switches to couple in router AR2(user, station location marker is/as2/ar2).
The communication process of this mechanism user mobile context is specific as follows:
Step 301, user ALICE moves and switches while being about to start, and sending a request message, (content name is "/as1/ar1/mobilitycontroller "; Type is " user moves beginning "; Application message be "/as1/ar1 " with "/as3/ar3/iplab/toalice.avi/v1/sn; n=43; ...; 62 ", n is the sequence number of video content piece) to the primary access router AR1 of ALICE, impel AR1 to upgrade that ALICE has asked but the required list entry undetermined (mobile status mark position that will be corresponding with the interface " 0 " that receives this request message is " 1 ") of not obtaining content; Meanwhile, ALICE stop sending a request message (content name is for "/as3/ar3/iplab/toalice.avi/v1/sn ", n=63,64, Type is " common "; Application message is " as3/ar3 ") to AR1, avoid ALICE to move the loss that switching causes request message.
Step 302, ALICE moves in handoff procedure, and AR1 is according to the required list entry undetermined (the mobile status flag bit is " 1 ") after upgrading, buffer memory mails to the data-message of ALICE original position, and (content name is for "/as3/ar3/iplab/toalice.avi/v1/sn ", n=43 ..., 62; Type is " common "; Application message is " as3/ar3 ").So, the data-message that AR1 no longer will comprise requested content is forwarded to the position that ALICE moves the front place of switching, whereby, can avoid ALICE to move the loss that switching causes data-message.
Step 303,, after ALICE moves and switched, send a request message (content name is "/as3/ar3/iplab/toalice.avi/v1/sn ", n=43 ..., 62; Type is " the mobile re-transmission "; Application message is "/as1/ar1 ") to AR1.
Step 304, AR1 receives the request message of step 303, and the data-message that upgrades buffer memory (is set to type " the mobile re-transmission "; Application message is set to "/as1/ar1 "), and the data-message after further upgrading (content name is "/as3/ar3/iplab/toalice.avi/v1/sn ", n=43 ..., 62; Type is " the mobile re-transmission "; Application message is " as1/ar1 ") be forwarded to the reposition after ALICE moves switching.So, ALICE, without waiting for that the whole network forwarding information base has upgraded, can fetch the content of failing to obtain mobile handoff procedure from contiguous AR1, whereby, can shorten to a certain extent ALICE and move the mobile handover delay that switching is introduced, the mobile switching that promotes ALICE is experienced.
Step 305, after this, ALICE start to send a request message (content name is for "/as3/ar3/iplab/toalice.avi/v1/sn ", n=63,64, Type is " common "; Application message is " as3/ar3 ") to the content source IPLAB that requested content can be provided.
Step 306, IPLAB receives the request message of step 305, construct and forward the data-message that comprises requested content (content name is "/as3/ar3/iplab/toalice.avi/v1/sn ", n=63,64, Type is " common "; Application message is " as3/ar3 ") move the reposition after switching to ALICE.So, ALICE and IPLAB can be by the interactive communications of common request message and data-message, and the ALICE that further continues moves the content requests before switching and obtains.
Required list entry undetermined in table 1 step 301 after the AR1 renewal
Embodiment bis-
The embodiment of the present invention provides the mechanism of the content source mobility support in a kind of content center network, can effectively avoid content source to move the loss that switching causes request message, and can shorten to a certain extent content source and move the mobile handover delay that switching is introduced, improve user's mobile switching and experience.
Content source mobile context schematic diagram under this mechanism as shown in figure 10, referring to table 2-4, content source NGIID is in providing the process of video/as1/ar1/ngiid/tobob.avi/v1 for user BOB, primary access router from couple in router AR1(content source, station location marker is/as1/ar1) the mobile new couple in router that switches to couple in router AR2(content source, station location marker is/as2/ar2).
The communication process of this contents of mechanism source mobile context is specific as follows:
Step 401, content source NGIID moves and switches while being about to start, and sending a request message, (content name is "/as1/ar1/mobilitycontroller "; Type is " content source moves beginning "; Application message is "/as1/ar1 " and "/as1/ar1/ngiid/tobob.avi/v1 ") to the primary access router AR1 of NGIID, impel AR1 to upgrade the forwarding information base entry corresponding with the available content of NGIID (mobile status mark position that will be corresponding with the interface that receives this request message " 0 " is " 1 ").
Step 402, NGIID moves in handoff procedure, and AR1 is according to the forwarding information base entry (the mobile status flag bit is " 1 ") after upgrading, buffer memory mails to the request message of NGIID original position, and (content name is for "/as1/ar1/ngiid/tobob.avi/v1/sn ", n=43 ..., 62; Type is " common "; Application message is "/as1/ar1 ").So, the AR1 request message that no longer will receive is forwarded to the position that NGIID moves the front place of switching; Whereby, can avoid NGIID to move the loss of switching the request message caused.
Step 403, after NGIID moves and switched, sending a request message, (content name is "/as1/ar1/mobilitycontroller "; Type is " content source has moved ", and application message is "/as1/ar1 ", "/as1/ar1/ngiid/tobob.avi/v1 " and "/as2/ar2 ") to AR1.During this request message approach AR2, impel AR2 to add the forwarding information base entry corresponding with the available content of content source; When this request message is forwarded to AR1, impel AR1 to upgrade the forwarding information base entry (outlet be set to " 1 ", by mobile status mark position be " 0 ", station location marker be set to "/as2/ar2 ") corresponding with the available content of content source.
Step 404, AR1 receives the request message of step 403, and the request message that renewal is mail to the NGIID original position (is set to type " the mobile forwarding "; Application message is set to "/as2/ar2 "), and the request message after further upgrading (content name is "/as1/ar1/ngiid/tobob.avi/v1/sn ", n=43 ..., 62; Type is " the mobile forwarding "; Application message is "/as2/ar2 ") be forwarded to the reposition after NGIID moves switching.
Step 405, NGIID receives the request message of step 4, by forwarding comprise requested content data-message (content name is for "/as1/ar1/ngiid/tobob.avi/v1/sn ", n=43 ..., 62; Type is " the mobile forwarding "; Application message is "/as2/ar2 ") to the user BOB that asks this content.So, BOB, without waiting for that the whole network forwarding information base has upgraded, can obtain NGIID the content provided after switching is provided, and whereby, can shorten to a certain extent NGIID and move the mobile handover delay that switching is introduced, and the mobile switching that promotes BOB is experienced.
Step 406, after this, BOB send a request message (content name is for "/as1/ar1/ngiid/tobob.avi/v1/sn ", n=63,64, Type is " common "; Application message is " as2/ar2 ") move the reposition after switching to NGIID.
Step 407, NGIID receives the request message of step 406, construct and forward the data-message that comprises requested content (content name is "/as1/ar1/ngiid/tobob.avi/v1/sn ", n=63,64, Type is " common "; Application message is " as2/ar2 ") to BOB.So, BOB and NGIID can be by the interactive communications of common request message and data-message, and the NGIID that further continues moves the content requests before switching and obtains.
Forwarding information base entry in table 2 step 401 after the AR1 renewal
Forwarding information base entry in table 3 step 403 after the AR1 renewal
The forwarding information base entry that in table 4 step 403, AR2 adds
Although more than described the specific embodiment of the present invention, but those skilled in the art is to be understood that, these embodiments only illustrate, those skilled in the art in the situation that do not break away from principle of the present invention and essence, can carry out various omissions, replacement and change to the details of said method and system.For example, merge the said method step, to realize the result that essence is identical, belong to scope of the present invention thereby carry out the identical function of essence according to the identical method of essence.Therefore, scope of the present invention is only limited by appended claims.
Claims (4)
1. the mobile support method in a content center network, is characterized in that, comprise the user mobility support scheme, this mechanism comprises the following steps:
The user moves switching while being about to start, and transmission types to its primary access router, impels its primary access router to upgrade that this user has asked but the required list entry undetermined of not obtaining content for the request message of " user moves beginning "; Simultaneously, the user stop transmission types for the request message of " common " to its network that is about to leave, avoiding the user to move switching, to cause type be the loss of the request message of " common ";
The user moves in handoff procedure, and its primary access router is according to the required list entry undetermined after upgrading, and buffer memory mails to the data-message of the type of user's original position for " common ", avoids the user to move the loss that switching causes data-message;
After the user moves and has switched, transmission types is that the request message of " mobile retransmit " is to its primary access router, impel the data-message that its primary access router is " common " by the type of buffer memory to be updated to the data-message of type for " the mobile re-transmission ", and be forwarded to the reposition after the user moves switching.
2. the mobile support method in the content center network according to claim 1, is characterized in that, further comprises:
After this, user's transmission types extremely can provide the content source of requested content for the request message of " common "; Content source forwards the type comprise requested content and moves the reposition after switching for the data-message of " common " to the user.
3. the mobile support method in the content center network according to claim 1, is characterized in that, further comprise content source mobility support mechanism, this mechanism comprises the following steps:
Content source moves switching while being about to start, and transmission types to its primary access router, impels its primary access router to upgrade the forwarding information base entry that this content source can provide content for the request message of " content source moves beginning ";
Content source moves in handoff procedure, and its primary access router is according to the forwarding information base entry after upgrading, and buffer memory mails to the request message of the type of content source original position for " common ", avoids content source to move the loss that switching causes request message;
After content source moves and has switched, transmission types for the request message of " content source has moved " to its primary access router, impel type that its primary access router will mail to the content source original position to be updated to the request message of type for " the mobile re-transmission " for the request message of " common ", and be forwarded to the reposition after content source moves switching;
Content source receives the request message of type for " mobile forward ", forward the type that comprises requested content for the data-message of " the mobile forwarding " to the user who asks this content.
4. the mobile support method in the content center network according to claim 3, is characterized in that, further comprises:
After this, user's transmission types moves the reposition after switching for request message to the content source of " common "; Content source forward the type comprise requested content for the data-message of " common " to the user who asks this content.
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