CN102469082A - Method for path switching, device and system - Google Patents
Method for path switching, device and system Download PDFInfo
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Abstract
The invention discloses a method for path switching. The method comprises the following steps that: after receiving a path switching request initiated by a network element in a current session, a core network control node acquires the end-to-end path quality and the core-network-side path quality of the current session; the core network control node determines the deterioration reason of the path of the current session according to the end-to-end path quality and the core-network-side path quality of the current session; and according to the determined deterioration reason of the path of the current session, the core network control node rejects the path switching request or reconstructs a media transmission path for the current session. The invention also discloses a device and a system for path switching, which can separate the path quality deterioration caused by an access network and the path quality deterioration caused by a core network and ensure that the end-to-end quality can be improved by switching the path, so that the efficiency of path switching for improving the path quality is effectively improved, and the user experience is effectively improved.
Description
Technical field
The present invention relates to the trail protection technology of communications field IP bearer network, relate in particular to a kind of path switching method and device, system.
Background technology
The fast development of the communication technology has brought the renewal day by day of communication network, but the high reliability of network is the performance requirement of basic most critical all the time.For reaching the various performance index in the business, the IP bearer network has been introduced the kinds of protect technology with link and has been monitored the bearer network situation in that equipment, path, network etc. are at all levels, finds that the faulty equipment walking along the street of going forward side by side directly switches.
Network architecture under a kind of common-mode of the trail protection technology of IP bearer network; As shown in Figure 1; Wherein, dotted line is represented the transmission path of signaling flow between terminal equipment A (UE_A) and the terminal equipment B (UE_B), and solid line is represented the transmission path of Media Stream between UE_A and the UE_B.UE_A and UE_B set up medium face transmission path through access network node A1, media device 1, access network node B1 under the assistance of core network control node.When UE_A or UE_B perceive the QoS variation in conversation procedure; Will be to core network control node initiation session handoff request; Core network control node is that UE_A and UE_B consult the media delivery path once more, and final UE_A and UE_B set up new medium face transmission path through access network node A1, media device 2, access network node B1.
The concrete implementation procedure that switch in the path between above-mentioned UE_A and the UE_B, as shown in Figure 2, mainly may further comprise the steps:
S201) UE_A and UE_B carry out multimedia communication through access network node A1, media device 1, access network node B1;
S202) UE_A perception quality of the conversation variation is sent the path to core network control node and is changed request;
Particularly, the end-to-end path quality that UE_A can the perception current path when the end-to-end path that perceives current path is second-rate, is sent the path to core network control node and is changed request.
S203) after core network control node receives the path replacing request of UE_A transmission; Load condition according to each media device in the core net; Reselect media device 2 as the relaying between UE_A and the UE_B; For UE_A and UE_B set up new media path, core network control node and media device 2 are mutual, are the current sessions reserve media resource;
S204) core network control node and UE_B carry out the conversation media information renewal alternately;
S205) core network control node returns media path renewal response to UE_A;
S206) UE_A and UE_B proceed multimedia communication through access network node A1, media device 2, access network node B1;
S207) core network control node and media device 1 are mutual, discharge the resource that current sessions takies on media device 1, accomplish current path and switch.
Along with the develop rapidly of terminal equipment and access network technology, multi-mode terminal equipment, plurality of access modes make the Access Network network become increasingly complex, and cause that bearer path is complicated end to end in the conversation procedure.Though and above-mentioned path handover scheme can guarantee when path quality deterioration end to end, to trigger the path switching flow; And core network control node is after receiving the path handoff request; In not finding current end-to-end path, cause before the reason of path quality deterioration; Just, come for UE selects new media device, and rebulid media path directly according to the media device load condition in the current core net.Like this; If when worsening the path quality deterioration that causes current end-to-end path owing to the path of terminal equipment Access Network part; Core network control node still adopts such scheme to carry out the path switching; End-to-end path after the switching possibly quality also be relatively poor, to such an extent as to fail to reach the purpose of improving the end-to-end path quality.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of path switching method and device, system, can not carry out the problem that switch in the path to the reason of current end-to-end path deterioration to solve existing path handover scheme.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides a kind of path switching method, said method comprises: after the path handoff request that the network element in receiving current sessions is initiated, core network control node obtains the end-to-end path quality and the core-network side path quality of current sessions; Said core network control node according to the end-to-end path quality of accessed current sessions, with the core-network side path quality, confirm the deterioration reason in current sessions path; According to the deterioration reason in the current sessions path of confirming, said core Control Node is refused said path handoff request, or is current sessions re-constructing media transmission path.
In such scheme, the network element of said initiation path handoff request is specially: terminal equipment on the current sessions path or WMG or media relays equipment.
In such scheme, said core network control node obtains the end-to-end path quality in current sessions path, is specially: said network element obtains the end-to-end path quality of current sessions, and carries to said core network control node through said path handoff request; Perhaps, said core network control node is initiatively inquired about the end-to-end path quality of current sessions to the terminal equipment of current sessions.
In such scheme, said core network control node obtains the core-network side path quality of current sessions, is specially: core network control node is through the path quality of core-network side on agent node management server queries current sessions path.
In such scheme; Said core network control node according to the end-to-end path quality of accessed current sessions, with the core-network side path quality; Confirm the deterioration reason in current sessions path; Be specially: said core network control node compares the end-to-end path quality and the core-network side path quality of accessed current sessions, if both differences meet preset path quality threshold value requirement, confirms that then the deterioration in current sessions path is caused by the core-network side path; If both differences do not meet preset path quality threshold value requirement, confirm that then the deterioration in current sessions path is caused by the Access Network side path.
In such scheme; According to the deterioration reason in the current sessions path of confirming, said core Control Node is refused said path handoff request, or is current sessions re-constructing media transmission path; Specifically comprise: when the deterioration of confirming the current sessions path is caused by the core-network side path; Said core network control node is a current sessions gravity treatment media device, and notifies the terminal equipment on the current sessions to switch on the media device of gravity treatment, is current sessions re-constructing media transmission path; When the deterioration of confirming the current sessions path was caused by the Access Network side path, said core network control node sent refuse information to the network element of said initiation path handoff request, refuses said path handoff request; Perhaps, said core network control node is a current sessions gravity treatment access network node, and notifies the terminal equipment on the current sessions path to switch on the gravity treatment access network node, is current sessions re-constructing media transmission path.
In such scheme; When the deterioration of confirming the current sessions path is caused by the Access Network side path; Said core network control node is refused said path handoff request; Specifically comprise: under following situation, core network control node sends refuse information to the network element of said initiation path handoff request, refuses said path handoff request: the Access Network information of two terminal equipments on the current sessions that core network control node fails to get access to; Perhaps, core network control node is according to the Access Network information of two terminal equipments on the current sessions that has got access to, and two terminal equipments all do not have other available access network nodes on the ability perception current sessions path; Perhaps, other available access network nodes of two terminal equipments on the current sessions path that is perceived, the switchover policy that has not all been disposed allows.
In such scheme; When the deterioration of confirming the current sessions path is caused by the Access Network side path; Said core network control node is a current sessions gravity treatment access network node; And notify the terminal equipment on the current sessions path to switch on the gravity treatment access network node, and be current sessions re-constructing media transmission path, specifically comprise: said core network control node can get access to the Access Network information of two terminal equipments on the current sessions path; And according to accessed Access Network information; Can feel that on the session path any terminal equipment or two terminal equipments have other available access network nodes, then in other available access network nodes of institute's perception, are one or two access network node of current sessions gravity treatment; And the terminal equipment on the notice current sessions switches on the access network node of gravity treatment, is current sessions re-constructing media transmission path.
The present invention also provides a kind of path switching device; Said device comprises: acquiring unit, confirm unit and motor unit; Wherein, Acquiring unit is used for after the path handoff request that the network element that receives current sessions is initiated, obtaining the end-to-end path quality and the core-network side path quality of current sessions; Confirm the unit, the end-to-end path quality of the current sessions that is used for getting access to according to said acquiring unit, with the core-network side path quality, confirm the deterioration reason in current sessions path; Motor unit is used for the deterioration reason according to definite current sessions path, said definite unit, refuses said path handoff request, or is current sessions re-constructing media transmission path.
In such scheme; Said acquiring unit comprises first acquisition module and second acquisition module; Wherein, First acquisition module is used for the end-to-end path quality through the network element acquisition current sessions of said initiation path handoff request, perhaps through inquire about the end-to-end path quality of current sessions to the terminal equipment of current sessions; Second acquisition module is used for the path quality through core-network side on agent node management server queries current sessions path.
In such scheme; Said definite unit; Specifically be used for; The end-to-end path quality and the core-network side path quality of the current sessions that said acquiring unit is got access to compare, if both differences meet preset path quality threshold value requirement, confirm that then the deterioration in current sessions path is caused by the core-network side path; If both differences do not meet preset path quality threshold value requirement, confirm that then the deterioration in current sessions path is caused by the Access Network side path; And determined current sessions path deterioration reason sent to said motor unit.
In such scheme, said motor unit specifically is used for, and receives the current sessions path deterioration reason that said definite unit sends; When the current sessions path deterioration reason that receives is the core-network side path, be current sessions gravity treatment media device, and notify the terminal equipment on the current sessions to switch on the media device of gravity treatment, be current sessions re-constructing media transmission path; When the current sessions path deterioration reason that receives is the Access Network side path,, refuse said path handoff request to the network element transmission refuse information of said initiation path handoff request; Perhaps, be current sessions gravity treatment access network node, and notify the terminal equipment on the current sessions path to switch on the gravity treatment access network node, be current sessions re-constructing media transmission path.
The present invention also provides a kind of path switching system; Said system comprises: terminal equipment, access network node, core network control node and media device, and wherein, core network control node comprises: acquiring unit, confirm unit and motor unit; Wherein, Acquiring unit is used for after the path handoff request that the network element that receives current sessions is initiated, obtaining the end-to-end path quality and the core-network side path quality of current sessions; Confirm the unit, the end-to-end path quality of the current sessions that is used for getting access to according to said acquiring unit, with the core-network side path quality, confirm the deterioration reason in current sessions path; Motor unit is used for the deterioration reason according to definite current sessions path, said definite unit, refuses said path handoff request, or is current sessions re-constructing media transmission path.
In such scheme, said system also comprises: the agent node management server, the acquiring unit of said core network control node is through obtaining the path quality of core-network side on the current sessions path to this agent node management server queries.
Path switching method provided by the present invention and device; According to the end-to-end path quality and the core-network side path quality in the current sessions path that is obtained, confirm the reason that worsen in the current sessions path, in the reason that worsens to the current sessions path; Take corresponding path handover operation; The path quality that thereby the path quality that can Access Network be caused worsens, cause with core net worsens and makes a distinction, and carries out more reasonably path hand-off process according to different path quality deterioration reasons, guarantees to improve the end-to-end path quality through toggle path; Thereby effectively improve the path switching and improve the efficient of path quality, and effectively improve user experience.
Description of drawings
Fig. 1 is the schematic network structure that switch in the path in the prior art;
Fig. 2 is the realization flow sketch map of path switching method in the prior art;
Fig. 3 is the realization flow figure of path switching method of the present invention;
Fig. 4 is a kind of schematic network structure of path switching device of the present invention;
Fig. 5 is the flow chart of the path switching method of the embodiment of the invention one;
Fig. 6 is the flow chart of the path switching method of the embodiment of the invention two;
Fig. 7 is the flow chart of the path switching method of the embodiment of the invention three;
Fig. 8 is the flow chart of the path switching method of the embodiment of the invention four;
Fig. 9 is the flow chart of the path switching method of the embodiment of the invention five.
Embodiment
Basic thought of the present invention is: core network control node is confirmed the path quality deterioration reason of current sessions according to the end-to-end path quality of current sessions and the core net path quality of current sessions; And, carry out corresponding path hand-off process according to the path deterioration reason of confirming.
Path switching method of the present invention with reference to shown in Figure 3, mainly comprises:
Step 301: after the path handoff request that the network element in receiving current sessions is initiated, core network control node obtains the end-to-end path quality and the core-network side path quality of current sessions;
Here, the said network element of initiating the path handoff request specifically can be a terminal equipment, also can be other media device on the current sessions path, like WMG, media relays equipment etc.
Here, above-mentioned path quality specifically can comprise MOS value, packet loss, time delay, the shake in path isoparametric one or more.
Step 302: said core network control node according to the end-to-end path quality of accessed current sessions, with the core-network side path quality, confirm the deterioration reason in current sessions path;
Step 303: according to the deterioration reason in the current sessions path of confirming, said core Control Node is refused said path handoff request, or is current sessions re-constructing media transmission path.
Wherein, core network control node obtains the process of the end-to-end path quality in current sessions path, can be: said network element obtains the end-to-end path quality of current sessions, and carries to said core network control node through said path handoff request; Perhaps, said core network control node is initiatively inquired about the end-to-end path quality of current sessions to the terminal equipment of current sessions.
Wherein, core network control node obtains the process of the core-network side path quality of current sessions, specifically can be: core network control node is through the path quality of core-network side on agent node management server queries current sessions path.
Particularly; Core network control node is to agent node management server transmit path quality query requests; This query requests has comprised the nodal information of wanting query path; The agent node management server is measured the path quality of wanting query path according to said path quality query requests, and reports said core network control node.
Here; The agent node management server is according to the nodal information of wanting query path that comprises in the said path quality query requests; Find near the agent node of wanting each node in the query path; The path quality of acting on behalf of the path that measurement is made up of each agent node that is found, and the measured path quality of acting on behalf of the path reported core network control node as the path quality of wanting query path.
Wherein, Said core network control node according to the end-to-end path quality of accessed current sessions, with the core-network side path quality; Confirm the deterioration reason in current sessions path; Be specially: said core network control node compares the end-to-end path quality and the core-network side path quality of accessed current sessions, if both differences meet preset path quality threshold value requirement, confirms that then the deterioration in current sessions path is caused by the core-network side path; If both differences do not meet preset path quality threshold value requirement, confirm that then the deterioration in current sessions path is caused by the Access Network side path.
Particularly; The current path quality that gets access to can comprise MOS value, packet loss, time delay, the shake in path isoparametric one or more; Being provided with of said path quality threshold value can confirm that set path quality threshold value can be provided with respectively according to the parameter that comprises in the path quality, perhaps makes up setting according to current path parameter that quality comprises; For example, can be set to: the path quality threshold value requires the time delay difference to be not more than 100ms and the packet loss difference is not more than 3%.
When the deterioration of confirming the current sessions path is caused by the core-network side path; Said core network control node is a current sessions gravity treatment media device; And the terminal equipment on the notice current sessions switches on the media device of gravity treatment, is current sessions re-constructing media transmission path.
When the deterioration of confirming the current sessions path was caused by the Access Network side path, said core network control node was refused said path handoff request; Perhaps, said core network control node is a current sessions gravity treatment access network node, and notifies this terminal equipment to switch on the gravity treatment access network node, is current sessions re-constructing media transmission path.
When the deterioration of confirming the current sessions path was caused by the Access Network side path, said core network control node was refused said path handoff request, specifically can comprise:
Under following situation, core network control node sends refuse information to the network element of said initiation path handoff request, refuses said path handoff request: the Access Network information of two terminal equipments on the current sessions that core network control node fails to get access to; Perhaps core network control node is according to the Access Network information of two terminal equipments on the current sessions that has got access to, and two terminal equipments all do not have other available access network nodes on the ability perception current sessions path; Other available access network nodes of two terminal equipments on the current sessions path that is perhaps perceived, the switchover policy that has not all been disposed allows.
When the deterioration of confirming the current sessions path is caused by the Access Network side path; Said core network control node is a current sessions gravity treatment access network node; And notify this terminal equipment to switch on the gravity treatment access network node, and be current sessions re-constructing media transmission path, specifically can comprise: said core network control node can get access to the Access Network information of two terminal equipments on the current sessions path; And according to accessed Access Network information; Can feel that on the session path any terminal equipment or two terminal equipments have other available access network nodes, then in other available access network nodes of institute's perception, are one or two access network node of current sessions gravity treatment; And the terminal equipment on the notice current sessions switches on the access network node of gravity treatment, is current sessions re-constructing media transmission path.
In order to realize said method; The present invention also provides a kind of path switching device, it is characterized in that, said device comprises: acquiring unit, confirm unit and motor unit; Wherein, Acquiring unit is used for after the path handoff request that the network element that receives current sessions is initiated, obtaining the end-to-end path quality and the core-network side path quality of current sessions; Confirm the unit, the end-to-end path quality of the current sessions that is used for getting access to according to said acquiring unit, with the core-network side path quality, confirm the deterioration reason in current sessions path; Motor unit is used for the deterioration reason according to definite current sessions path, said definite unit, refuses said path handoff request, or is current sessions re-constructing media transmission path.
Wherein, Said acquiring unit comprises first acquisition module and second acquisition module; Wherein, First acquisition module is used for the end-to-end path quality through the network element acquisition current sessions of said initiation path handoff request, perhaps through inquire about the end-to-end path quality of current sessions to the terminal equipment of current sessions; Second acquisition module is used for the path quality through core-network side on agent node management server queries current sessions path.
Wherein, Said definite unit; Specifically be used for; The end-to-end path quality and the core-network side path quality of the current sessions that said acquiring unit is got access to compare, if both differences meet preset path quality threshold value requirement, confirm that then the deterioration in current sessions path is caused by the core-network side path; If both differences do not meet preset path quality threshold value requirement, confirm that then the deterioration in current sessions path is caused by the Access Network side path; And determined current sessions path deterioration reason sent to said motor unit.
Here, said motor unit specifically is used for, and receives the current sessions path deterioration reason that said definite unit sends; When the current sessions path deterioration reason that receives is the core-network side path, be current sessions gravity treatment media device, and notify the terminal equipment on the current sessions to switch on the media device of gravity treatment, be current sessions re-constructing media transmission path; When the current sessions path deterioration reason that receives is the Access Network side path,, refuse said path handoff request to the network element transmission refuse information of said initiation path handoff request; Perhaps, be current sessions gravity treatment access network node, and notify the terminal equipment on the current sessions path to switch on the gravity treatment access network node, be current sessions re-constructing media transmission path.
Path switching device provided by the present invention can be arranged in the core network control node of existing route switched system, also can independently be arranged in the existing path switching system, is connected with other network elements in this system.
In addition, the present invention also provides a kind of path switching system, and this system mainly comprises: terminal equipment, access network node, core network control node, media device, wherein, core network control node includes above-mentioned path switching device.
Wherein, Said path switching system can also comprise: the agent node management server; The agent node management server, the acquiring unit of said core network control node is through obtaining the path quality of core-network side on the current sessions path to this agent node management server queries.
Fig. 4 is a kind of specific embodiment of path switching system provided by the present invention, and this system mainly comprises: terminal equipment, access network node, core network control node, media device, agent node management server, agent node.
Wherein, Core network control node includes path switching device provided by the present invention (not showing among Fig. 4); Be responsible for setting up between the terminal equipment Signalling exchange of communication path and control with media resource, can be on agent node management server queries session path the network quality of core-network side.In addition, core network control node can also obtain and preserve the Access Network information of terminal equipment.
Wherein, terminal equipment is specially the user terminal that uses Session Initiation Protocol, is specially the UE_A shown in Fig. 4, UE_B.
Access network node is the access device of terminal equipment to carrier network, and general different Access Network has different access nodes.A terminal equipment can have plurality of access modes, and corresponding different access network node has been listed access network node A1 and the access network node A2 of UE_A, the access network node B1 of UE_B and access network node B2 among Fig. 4.
Media device is responsible between the terminal equipment, between terminal equipment and the media device, transmit media message between the media device.
The agent node management server is in charge of the overlay network that agent node is formed, and comprises the management of network measure task between the keep-alive, agent node of agent node, the collection of network quality measurement data etc.The agent node management server also provides query interface to core network control node, returns the network quality situation between the specified network node.
Agent node is positioned at network side, and near the network equipment of user's access node, controlled by the agent node management server, and carries out network quality between other agent node and measure, and gives the agent node management server with reporting measuring result.
Wherein, media device and agent node can be same physical equipments, also can be different physical equipment.
Embodiment one
Present embodiment has been described owing to the core-network side path quality worsens and carried out a kind of implementation procedure that switch in the path when causing current sessions path quality variation: UE_A and UE_B carry out multimedia communication through access network node A1, access network node B1; When UE_A perceives current sessions path quality variation; Initiate the path handoff request to core network control node, after core network control node receives said path handoff request, get access to the end-to-end path quality and the core-network side path quality state in current sessions path; And end-to-end path quality and the core-network side path quality of judging the current sessions path are more or less the same; Confirming that the current sessions path quality worsens by core net causes that at this moment, core network control node can be according to certain strategy; Select one or more media devices as relaying; And notify UE_A and UE_B current sessions to be switched on the media device of gravity treatment, and rebuild the media delivery path of UE_A and UE_B, accomplish the path and switch.
As shown in Figure 5, the path switching flow of present embodiment specifically may further comprise the steps:
S501) UE_A and UE_B carry out multimedia communication through access network node A1, access network node B1;
S502) UE_A perceives the current sessions degradation, in the time of need carrying out the path switching, initiates the path handoff request to core network control node, and said path request message is carried the end-to-end path quality Q 1 in current sessions path;
Here; The process of UE_A perception current sessions degradation, specifically can be: UE_A obtains the quality of the conversation of current sessions in real time, detects the current sessions non-conformity of quality and closes the requirement of predefined quality of the conversation threshold value; Then confirm the current sessions degradation, need carry out the path and switch.
Here; Said quality of the conversation can comprise voice MOS value, time delay, packet loss, shake isoparametric any one or combination in any; General speech business mass parameter require for the MOS value greater than 3.5, time delay less than 5% etc., can require to be provided with corresponding quality of the conversation threshold value less than 300ms, packet loss according to this.For example, can be set to: the quality of the conversation threshold value require the MOS value greater than 3.5 and/or time delay less than 300ms and/or packet loss less than 5%.
S503) after core network control node receives said path handoff request, obtain the core-network side path quality Q2 in current sessions path to the agent node management server queries;
Here, the core-network side path in current sessions path specifically is meant the path between access node A1, the access node B1, and the core-network side path quality Q2 in said current sessions path specifically is meant the path quality in path between access node A1, the access node B1.
Particularly; Core network control node can send query requests to the agent node management server; Carry two terminal point information wanting query path in this query requests; Be the information such as sign or address of access node A1 and access node B1; The agent node management server receives after this query requests, finds out near the agent node SA of access node A1 and near the agent node SB of access node B1, measures the path quality between agent node SA and the agent node SB; And, report said core network control node with the path quality Q2 of the path quality between agent node SA that measures and the agent node SB as path between access node A1 and the access node B1.
S504) core network control node compares the end-to-end path quality Q of carrying in the handoff request of said path 1 with core-network side path quality Q2; Obtain both differences and be not more than the path quality threshold value that is provided with in advance; Confirm that then the deterioration of current sessions path quality is caused that by the core net path core network control node is that current sessions gravity treatment media device 1 is as relaying.
Here, core network control node can be current sessions gravity treatment media device according to the load condition of each media device in the current core net; Can select a media device; Also can select a plurality of media devices simultaneously, detailed process is a prior art, and the present invention no longer details.
S505) core network control node and media device 1 carry out being the current sessions reserve media resource alternately;
Here, mutual if core network control node is the current sessions gravity treatment a plurality of media devices as relaying, then need respectively to carry out resource reservation to selected a plurality of media devices.
S506) core network control node notice UE_B carries out the media path renewal, and notice UE_B switches to the current sessions path on the media device 1;
S507) the core Control Node is to UE_A return path handoff response, and notice UE_A switches to the current sessions path on the media device 1, is current sessions re-constructing media transmission path;
S508) UE_A and UE_B proceed multimedia communication through access network node A1, media device 1, access network node B1.
Embodiment two
Present embodiment has been described owing to the core-network side path quality worsens and carried out the another kind of implementation procedure that switch in the path when causing current sessions path quality variation: UE_A and UE_B carry out multimedia communication through access network node A1, media device 1, access network node B1; UE_A perception current sessions path quality variation; Then initiate the path handoff request, after core network control node receives said path handoff request, get access to the end-to-end path quality and the core-network side path quality state in current sessions path to core network control node; And end-to-end path quality and the core-network side path quality of judging the current sessions path are more or less the same; Confirming that the current sessions path quality worsens by core net causes that at this moment, core network control node can be according to certain strategy; For the one or more media devices of current sessions gravity treatment as relaying; And notify UE_A and UE_B current sessions to be switched on the media device of gravity treatment, and rebuild the media delivery path of UE_A and UE_B, accomplish the path and switch.
As shown in Figure 6, the path switching flow of present embodiment specifically may further comprise the steps:
S601, UE_A and UE_B carry out multimedia communication through access network node A1, media device 1, access network node B1;
S602, S502 is identical with step;
S603; S503 is basic identical with step; Different is; The path of core side is specially the path between access node A1, media device 1, the access node B1 in the present embodiment, and core network control node is specially the path quality between access node A1, media device 1, the access node B1 to the core-network side path quality Q2 of agent node management service inquiry;
Particularly; The agent node management server is after receiving the query requests that core network control node sends; Find near the agent node SA of access node A1 and near the agent node SB of access node B1; Path quality between measurement agent node SA and the media device 1 and the path quality between media device 1 and the agent node SB; And, report core network control node with the path quality Q2 of the path quality sum between the path quality between agent node SA and the media device 1 and media device 1 and the agent node SB as core-network side;
S604) basic identical with step S504, different is that core net is that current sessions gravity treatment media device 2 is as relaying in the present embodiment;
S605) core network control node and media device 2 carry out being the current sessions reserve media resource alternately;
S606) core network control node notice UE_B carries out the media path renewal, and notice UE_B switches to the current sessions path on the media device 2;
S607) the core Control Node is to UE_A return path handoff response, and notice UE_A switches to the current sessions path on the media device 2, is current sessions re-constructing media transmission path;
S608) UE_A and UE_B proceed multimedia communication through access network node A1, media device 2, access network node B1.
S609) core network control node and media device 1 carry out alternately, discharge the media resource that current sessions takies on media device 1.
Embodiment three
Present embodiment has been described owing to the core-network side path quality worsens and carried out the another kind of implementation procedure that switch in the path when causing current sessions path quality variation: UE_A and UE_B carry out multimedia communication through access network node A1, media device 1, access network node B1; The media device 1 perception current sessions path quality variation of core net; Initiate the path handoff request to core network control node; After core network control node receives the path handoff request; Obtain the end-to-end path quality and the core-network side path quality in current sessions path; Confirm that the deterioration of current sessions path quality is caused by core-network side path quality variation, and trigger corresponding path hand-off process flow process in view of the above.
As shown in Figure 7, the path switching flow of present embodiment specifically may further comprise the steps:
S701) identical with step S601;
S702) media device 1 on the current sessions path perceives the current sessions degradation, initiates the path handoff request to core network control node;
Here; Media device can be core net WMG or media relays equipment; Can come perception current sessions quality through the transfer of data statistics of current sessions; As the parameters such as packet loss and shake of adding up the media message of current sessions, when packet loss or shake are higher than the quality of the conversation threshold value of setting, initiate the path handoff request.
S703) after core network control node receives said path handoff request, the end-to-end path quality Q 1 to UE_A inquiry current sessions path;
S704) core network control node is to the core-network side path quality Q2 in agent node management server queries current sessions path;
Here, concrete implementation procedure and step 603 are identical.
S705) identical with step S604;
S706) identical with step S605;
S707) identical with step S606;
S708) core network control node notice UE_A carries out the media path renewal, and notice UE_A switches to the current sessions path on the media device 1;
S709) identical with step S608;
S710) identical with step S609.
Here, step S703 and step S704 can also carry out simultaneously, perhaps, and also can first execution in step S704, execution in step S703 again.
Embodiment four
Present embodiment has been described owing to the Access Network path quality worsens and carried out a kind of implementation procedure that switch in the path when causing current sessions path quality variation: UE_A and UE_B carry out multimedia communication through access network node A1, media device 1, access network node B1; Wherein, Said media device 1 possibly not exist as the media device of core-network side; Also possibly exist one and more than, UE_A perception session path degradation is initiated the path handoff request to core network control node; After core network control node receives said path handoff request; Obtain the end-to-end path quality and the core-network side path quality in current sessions path, obtain that end-to-end path quality obviously is worse than the core-network side path quality on the current sessions path, confirm that the current sessions path quality worsens to cause by Access Network side path degradation; At this moment, core network control node can select to refuse the path handoff request of UE_A.
As shown in Figure 8, the path switching flow of present embodiment specifically may further comprise the steps:
S801) identical with step S601;
S802) identical with step S602;
S803) identical with step S603;
S804) core network control node compares the end-to-end path quality Q of carrying in the handoff request of said path 1 with core-network side path quality Q2; Obtain both differences greater than the path quality threshold value that is provided with in advance; Confirm that then the deterioration of current sessions path quality is caused by the Access Network path, the path handoff request of core network control node decision refusal UE_A;
Wherein, core network control node can be under following several kinds of situation, the path handoff request of decision refusal terminal equipment:
First kind: core network control node can come the multiple Access Network information of collection terminal equipment through many registrations of terminal equipment, and according to the Access Network information of terminal equipment, whether perception terminal equipment also has other available access network nodes.Particularly; Core network control node is according to the Access Network information of UE_A and UE_B; Whether perception UE_A and UE_B have other available access network nodes, if UE_A and UE_B do not have available access network node, then the path handoff request of UE_A is refused in decision.
Second kind: operator is pre-configured switchover policy on core network control node; Core network control node can be according to the switchover policy that is disposed; The path handoff request of decision refusal terminal equipment, for example, the switchover policy that is disposed can be the one or more access network nodes that do not allow to switch to appointment; Core network control node is according to the Access Network information of terminal equipment; After finding available access network node, if the access network node that is found just in time in unallowed one or more access network nodes of appointment, then determines the path handoff request of refusal terminal equipment in said switchover policy.
The third, core network control node is directly refused the path handoff request of terminal equipment in the time can't getting access to the Access Network information of terminal equipment.
S805) core network control node carries the refuse information that is used to refuse said path handoff request to UE_A return path handoff response in this path handoff response, and its path handoff request of notice UE_A is rejected;
S806) keep the current sessions path constant between UE_A and the UE_B, continue to carry out multimedia communication through access network node A1, media device 1, access network node B1.
Embodiment five
Present embodiment has been described owing to the Access Network path quality worsens and carried out the another kind of implementation procedure that switch in the path when causing current sessions path quality variation: UE_A and UE_B carry out multimedia communication through access network node A1, access network node B1.UE_A perception session path degradation; Initiate the path handoff request to core network control node, after core network control node receives said path handoff request, obtain the end-to-end path quality and the core-network side path quality in current sessions path; Obtain that end-to-end path quality obviously is worse than the core-network side path quality on the current sessions path; Confirm that the deterioration of current sessions path quality is caused that by Access Network side path degradation at this moment, core network control node can be notified UE_A and/or UE_B; Switch to other access network node, rebulid the media delivery path.
As shown in Figure 9, the path switching flow of present embodiment specifically may further comprise the steps:
S901) identical with step S501;
S902) identical with step S502;
S903) identical with step S503;
S904) core network control node compares the end-to-end path quality Q of carrying in the handoff request of said path 1 with core-network side path quality Q2; Obtain both differences greater than the path quality threshold value that is provided with in advance; Confirm that then the deterioration of current sessions path quality is caused by the Access Network path; Core network control node perceives UE_A and/or UE_B also has other available access network nodes, and decision switches to new access network node A2 with UE_A, and UE_B is switched to new access network node B2;
Particularly, core network control node is according to the Access Network information of UE_A and UE_B, and perceiving UE_A and/or UE_B has other available access network nodes, then is UE_A and/or UE_B gravity treatment access network node.
S905) core network control node notice UE_B is updated on the access network node B2 and communicates;
S906) core network control node is to UE_A return path handoff response, and notice UE_B switches on the access network node A2 and communicates;
S907) UE_A and UE_B switch to access network node A2, access network node B2 respectively through consulting with core network control node, proceed multimedia communication through access network node A2, access network node B2.
In the present embodiment, carry out access point when switching, can be UE_A and UE_B gravity treatment access network node all; And UE_A and UE_B switched to the access network node of gravity treatment; Also can be only for any gravity treatment access node of UE_A and UE_B wherein and switch, in the practical application, UE_A that is collected according to self by core network control node and the Access Network information of UE_B determine whether gravity treatment access network node and the access network node that whether switches to gravity treatment; Detailed process is a prior art; Those skilled in the art can combine this prior art according to this area common technology means with the present invention, come realizing route to switch.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1. a path switching method is characterized in that, said method comprises:
After the path handoff request that network element in receiving current sessions is initiated, core network control node obtains the end-to-end path quality and the core-network side path quality of current sessions;
Said core network control node according to the end-to-end path quality of accessed current sessions, with the core-network side path quality, confirm the deterioration reason in current sessions path;
According to the deterioration reason in the current sessions path of confirming, said core Control Node is refused said path handoff request, or is current sessions re-constructing media transmission path.
2. path switching method according to claim 1 is characterized in that, the network element of said initiation path handoff request is specially: terminal equipment on the current sessions path or WMG or media relays equipment.
3. path switching method according to claim 1 is characterized in that, said core network control node obtains the end-to-end path quality in current sessions path, is specially:
Said network element obtains the end-to-end path quality of current sessions, and carries to said core network control node through said path handoff request;
Perhaps, said core network control node is initiatively inquired about the end-to-end path quality of current sessions to the terminal equipment of current sessions.
4. path switching method according to claim 1 is characterized in that, said core network control node obtains the core-network side path quality of current sessions, is specially:
Core network control node is through the path quality of core-network side on agent node management server queries current sessions path.
5. path switching method according to claim 1 is characterized in that, said core network control node according to the end-to-end path quality of accessed current sessions, with the core-network side path quality, confirm to be specially the deterioration reason in current sessions path:
Said core network control node compares the end-to-end path quality and the core-network side path quality of accessed current sessions; If both differences meet preset path quality threshold value requirement, confirm that then the deterioration in current sessions path is caused by the core-network side path; If both differences do not meet preset path quality threshold value requirement, confirm that then the deterioration in current sessions path is caused by the Access Network side path.
6. path switching method according to claim 5 is characterized in that, according to the deterioration reason in the current sessions path of confirming, said core Control Node is refused said path handoff request, or is current sessions re-constructing media transmission path, specifically comprises:
When the deterioration of confirming the current sessions path is caused by the core-network side path; Said core network control node is a current sessions gravity treatment media device; And the terminal equipment on the notice current sessions switches on the media device of gravity treatment, is current sessions re-constructing media transmission path;
When the deterioration of confirming the current sessions path was caused by the Access Network side path, said core network control node sent refuse information to the network element of said initiation path handoff request, refuses said path handoff request; Perhaps, said core network control node is a current sessions gravity treatment access network node, and notifies the terminal equipment on the current sessions path to switch on the gravity treatment access network node, is current sessions re-constructing media transmission path.
7. path switching method according to claim 6 is characterized in that, when the deterioration of confirming the current sessions path was caused by the Access Network side path, said core network control node was refused said path handoff request, specifically comprises:
Under following situation, core network control node sends refuse information to the network element of said initiation path handoff request, refuses said path handoff request:
The Access Network information of two terminal equipments on the current sessions that core network control node fails to get access to; Perhaps, core network control node is according to the Access Network information of two terminal equipments on the current sessions that has got access to, and two terminal equipments all do not have other available access network nodes on the ability perception current sessions path; Perhaps, other available access network nodes of two terminal equipments on the current sessions path that is perceived, the switchover policy that has not all been disposed allows.
8. path switching method according to claim 6; It is characterized in that; When the deterioration of confirming the current sessions path was caused by the Access Network side path, said core network control node was a current sessions gravity treatment access network node, and the terminal equipment on the notice current sessions path switches on the gravity treatment access network node; Be current sessions re-constructing media transmission path, specifically comprise:
Said core network control node can get access to the Access Network information of two terminal equipments on the current sessions path; And according to accessed Access Network information; Can feel that on the session path any terminal equipment or two terminal equipments have other available access network nodes; Then in other available access network nodes of institute's perception; Be one or two access network node of current sessions gravity treatment, and notify the terminal equipment on the current sessions to switch on the access network node of gravity treatment, be current sessions re-constructing media transmission path.
9. a path switching device is characterized in that, said device comprises: acquiring unit, confirm unit and motor unit, wherein,
Acquiring unit is used for after the path handoff request that the network element that receives current sessions is initiated, obtaining the end-to-end path quality and the core-network side path quality of current sessions;
Confirm the unit, the end-to-end path quality of the current sessions that is used for getting access to according to said acquiring unit, with the core-network side path quality, confirm the deterioration reason in current sessions path;
Motor unit is used for the deterioration reason according to definite current sessions path, said definite unit, refuses said path handoff request, or is current sessions re-constructing media transmission path.
10. path switching device according to claim 9 is characterized in that, said acquiring unit comprises first acquisition module and second acquisition module, wherein,
First acquisition module is used for the end-to-end path quality through the network element acquisition current sessions of said initiation path handoff request, perhaps through inquire about the end-to-end path quality of current sessions to the terminal equipment of current sessions;
Second acquisition module is used for the path quality through core-network side on agent node management server queries current sessions path.
11. path switching device according to claim 9 is characterized in that, said definite unit specifically is used for,
The end-to-end path quality and the core-network side path quality of the current sessions that said acquiring unit is got access to compare, if both differences meet preset path quality threshold value requirement, confirm that then the deterioration in current sessions path is caused by the core-network side path; If both differences do not meet preset path quality threshold value requirement, confirm that then the deterioration in current sessions path is caused by the Access Network side path; And determined current sessions path deterioration reason sent to said motor unit.
12. path switching device according to claim 11 is characterized in that, said motor unit specifically is used for,
Receive the current sessions path deterioration reason that said definite unit sends;
When the current sessions path deterioration reason that receives is the core-network side path, be current sessions gravity treatment media device, and notify the terminal equipment on the current sessions to switch on the media device of gravity treatment, be current sessions re-constructing media transmission path;
When the current sessions path deterioration reason that receives is the Access Network side path,, refuse said path handoff request to the network element transmission refuse information of said initiation path handoff request; Perhaps, be current sessions gravity treatment access network node, and notify the terminal equipment on the current sessions path to switch on the gravity treatment access network node, be current sessions re-constructing media transmission path.
13. a path switching system is characterized in that, said system comprises: terminal equipment, access network node, core network control node and media device, and wherein, core network control node comprises: acquiring unit, confirm unit and motor unit, wherein,
Acquiring unit is used for after the path handoff request that the network element that receives current sessions is initiated, obtaining the end-to-end path quality and the core-network side path quality of current sessions;
Confirm the unit, the end-to-end path quality of the current sessions that is used for getting access to according to said acquiring unit, with the core-network side path quality, confirm the deterioration reason in current sessions path;
Motor unit is used for the deterioration reason according to definite current sessions path, said definite unit, refuses said path handoff request, or is current sessions re-constructing media transmission path.
14. path switching system according to claim 13; It is characterized in that; Said system also comprises: the agent node management server, the acquiring unit of said core network control node is through obtaining the path quality of core-network side on the current sessions path to this agent node management server queries.
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| CN102469082B (en) | 2015-10-21 |
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