WO2012062164A1 - 一种路径切换方法及装置、系统 - Google Patents
一种路径切换方法及装置、系统 Download PDFInfo
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- WO2012062164A1 WO2012062164A1 PCT/CN2011/081263 CN2011081263W WO2012062164A1 WO 2012062164 A1 WO2012062164 A1 WO 2012062164A1 CN 2011081263 W CN2011081263 W CN 2011081263W WO 2012062164 A1 WO2012062164 A1 WO 2012062164A1
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- path
- current session
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/22—Alternate routing
Definitions
- the present invention relates to a path protection technology for an IP bearer network in a communication field, and in particular, to a path switching method, apparatus, and system. Background technique
- IP bearer network introduces multiple protection technologies at various levels and links, such as devices, paths, and networks, to monitor the status of the bearer network, discover faulty devices, and perform path switchover.
- FIG. 1 A network system structure in a general mode of path protection technology of an IP bearer network, as shown in FIG. 1, wherein a dotted line indicates a transmission path of a signaling flow between a terminal device A (UE_A) and a terminal device B (UE B)
- the solid line indicates the transmission path of the media stream between UE-A and UE-B.
- the UE-A and the UE-B establish a media plane transmission path through the access network node A1, the media device 1, and the access network node B1 with the assistance of the core network control node.
- a session handover request is initiated to the core network control node, and the core network control node negotiates the media transmission path for UE-A and UE-B again, and finally the UE- A and UE-B establish a new media plane transmission path through the access network node A1, the media device 2, and the access network node B1.
- UE A and UE-B perform multimedia communication through the access network node Al, the media device 1, and the access network node B1;
- UE-A senses that the session quality is deteriorated, and sends a path change request to the core network control node. Specifically, UE A can sense the end-to-end path quality of the current path, and perceive the current path. When the end-to-end path quality of the path is poor, a path change request is issued to the core network control node.
- the core network control node After receiving the path change request sent by the UE-A, the core network control node reselects the media device 2 as a relay between the UE-A and the UE-B according to the load status of each media device in the core network, and is the UE. – A and UE—B establish a new media path, and the core network control node interacts with the media device 2 to reserve media resources for the current session;
- the core network control node interacts with the UE-B to perform session media information update
- the core network control node returns a media path update response to the UE-A;
- UE A and UE-B continue to perform multimedia communication through the access network node Al, the media device 2, and the access network node B1;
- the core network control node interacts with the media device 1 to release the resources occupied by the current session on the media device 1, and complete the current path switch.
- the above path switching scheme can ensure that the path switching process is triggered when the end-to-end path quality deteriorates, and the core network control node does not find the cause of the path quality deterioration in the current end-to-end path after receiving the path switching request. , directly select a new media device for the UE according to the media device load status in the current core network, and re-establish the media path.
- the core network control node still adopts the above scheme for path switching, and the end-to-end path after the handover may be of poor quality. So that it failed to achieve the purpose of improving the quality of the end-to-end path.
- the main object of the present invention is to provide a path switching method, apparatus, and system to solve the problem that the existing path switching scheme cannot perform path switching for the cause of current end-to-end path quality deterioration.
- the technical solution of the present invention is achieved as follows:
- the present invention provides a path switching method, the method includes: after receiving a path switching request initiated by a network element in a current session, the core network control node acquires an end-to-end path quality of the current session, and a core network side path.
- the core network control node determines the cause of the deterioration of the current session path according to the obtained end-to-end path quality of the current session and the path quality of the core network side; the core is determined according to the determined cause of the deterioration of the current session path.
- the control node rejects the path switch request or reestablishes the media transport path for the current session.
- the network element that initiates the path switching request is specifically: a terminal device, a media gateway, or a media relay device on the current session path.
- the core network control node obtains the end-to-end path quality of the current session path, specifically: the network element obtains the end-to-end path quality of the current session, and carries the path to the The core network control node; or the core network control node actively queries the terminal device of the current session for the end-to-end path quality of the current session.
- the core network control node obtains the core network side path quality of the current session, and specifically: the core network control node queries the proxy node management server to query the path quality of the core network side on the current session path.
- the core network control node determines the cause of the deterioration of the current session path according to the obtained end-to-end path quality of the current session and the path quality of the core network side, specifically: the core network control node
- the end-to-end path quality of the current session is compared with the quality of the core network side path. If the difference between the two meets the preset path quality threshold, it is determined that the deterioration of the current session path is caused by the core network side path. If the difference between the two does not meet the preset path quality threshold requirement, it is determined that the deterioration of the current session path is from the access network side path I.
- the core control node rejects the path switching request, or re-establishes a media transmission path for the current session, according to the determined cause of the deterioration of the current session path, specifically: When it is determined that the deterioration of the current session path is caused by the core network side path, the core network control node reselects the media device for the current session, and notifies the terminal device on the current session to switch to the reselected media device, and reconstructs the current session.
- the core network control node when it is determined that the deterioration of the current session path is caused by the access network side path, the core network control node sends a reject message to the network element that initiates the path switch request, rejecting the path switch request; or The core network control node reselects the access network node for the current session, and notifies the terminal device on the current session path to switch to the reselection access network node, and reconstructs the media transmission path for the current session.
- the core network control node rejects the path switching request, which specifically includes: in the following case, the core network control node sends the path to the The network element of the path switching request sends a reject message, rejecting the path switching request: the access network information of the two terminal devices in the current session that the core network control node fails to obtain; or, the core network control node is obtained according to the obtained.
- the access network information of the two terminal devices on the current session can be aware that the two terminal devices on the current session path have no other available access network nodes; or, the other available interfaces of the two terminal devices on the current session path are perceived.
- the incoming nodes are not allowed by the configured switching policy.
- the core network control node when it is determined that the deterioration of the current session path is caused by the access network side path, the core network control node reselects the access network node for the current session, and notifies the terminal device on the current session path to switch to the reselection.
- the core network control node can obtain the access network information of the two terminal devices on the current session path, and according to the acquired access network information It can be felt that when any terminal device or two terminal devices on the session path have other available access network nodes, one or two access networks are reselected for the current session among other available access network nodes that are perceived. The node notifies the terminal device on the current session to switch to the reselected access network node to reestablish the media transmission path for the current session.
- the invention also provides a path switching device, the device comprising: an acquiring unit, determining a unit and an action unit, where the acquiring unit is configured to obtain an end-to-end path quality of the current session and a path quality of the core network side after receiving the path switching request initiated by the network element in the current session; Determining the cause of the deterioration of the current session path according to the end-to-end path quality of the current session acquired by the obtaining unit and the path quality of the core network side; and the action unit, configured to determine the cause of the deterioration of the current session path according to the determining unit Reject the path switch request or rebuild the media transfer path for the current session.
- the acquiring unit includes a first acquiring module and a second acquiring module, where the first acquiring module is configured to obtain, by using the network element that initiates the path switching request, the end-to-end path quality of the current session, or
- the second acquisition module is configured to query the proxy node management server to query the path quality of the core network side on the current session path by querying the terminal device of the current session.
- the determining unit is specifically configured to compare end-to-end path quality of the current session acquired by the acquiring unit with a path quality of the core network side, if the difference between the two matches the preset path. If the quality threshold is required, it is determined that the deterioration of the current session path is caused by the path of the core network side; if the difference between the two does not meet the preset path quality threshold requirement, it is determined that the deterioration of the current session path is caused by the path of the access network side; The determined cause of the current session path deterioration is sent to the action unit.
- the action unit is specifically configured to: receive a current session path deterioration cause sent by the determining unit; and reselect the media device for the current session when the received current session path deterioration cause is a core network side path And notifying the terminal device in the current session to switch to the reselected media device, re-establishing the media transmission path for the current session; and when the received current session path deterioration cause is the access network side path, switching the request to the originating path
- the network element sends a reject message, rejects the path switch request; or, reselects the access network node for the current session, and notifies the terminal device on the current session path to switch to the reselected access network node, and reconstructs the media for the current session.
- the present invention also provides a path switching system, where the system includes: a terminal device, an access network node, a core network control node, and a media device, where the core network control node includes: an acquiring unit, a determining unit, and an action unit, where And an obtaining unit, configured to obtain an end-to-end path quality of the current session and a path quality of the core network side after receiving the path switching request initiated by the network element in the current session, where the determining unit is configured to obtain according to the acquiring unit Determining the cause of the deterioration of the current session path by the end-to-end path quality of the current session, and the path quality of the core network side; and the action unit, for rejecting the path switch according to the cause of the deterioration of the current session path determined by the determining unit Request, or rebuild the media transfer path for the current session.
- the core network control node includes: an acquiring unit, a determining unit, and an action unit, where And an obtaining unit, configured to obtain an end-to
- the system further includes: a proxy node management server, wherein the acquiring unit of the core network control node obtains the path quality of the core network side on the current session path by querying the proxy node management server.
- the path switching method and apparatus determines the cause of the current session path deterioration according to the obtained end-to-end path quality of the current session path and the path quality of the core network side, and takes the cause of the deterioration of the current session path.
- the corresponding path switching operation can distinguish the path quality caused by the access network from the path quality deterioration caused by the core network, and perform more reasonable path switching processing according to different path quality deterioration reasons to ensure that the path can be switched. To improve the end-to-end path quality, thereby effectively improving the efficiency of path switching to improve path quality, and effectively improve the user experience.
- FIG. 1 is a schematic diagram of a network structure of path switching in the prior art
- FIG. 2 is a schematic flowchart of an implementation process of a path switching method in the prior art
- FIG. 3 is a flowchart of an implementation of a path switching method according to the present invention.
- FIG. 4 is a schematic diagram of a network structure of a path switching device according to the present invention.
- FIG. 5 is a flowchart of a path switching method according to Embodiment 1 of the present invention.
- FIG. 6 is a flowchart of a path switching method according to Embodiment 2 of the present invention
- 7 is a flowchart of a path switching method according to Embodiment 3 of the present invention
- FIG. 8 is a flowchart of a path switching method according to Embodiment 4 of the present invention.
- FIG. 9 is a flowchart of a path switching method according to Embodiment 5 of the present invention. detailed description
- the core network control node determines the cause of the path quality deterioration of the current session according to the end-to-end path quality of the current session and the quality of the core network path of the current session, and performs corresponding according to the determined path deterioration cause. Path switching processing.
- the path switching method of the present invention mainly includes:
- Step 301 After receiving the path switching request initiated by the network element in the current session, the core network control node obtains the end-to-end path quality of the current session and the path quality of the core network side.
- the network element that initiates the path switch request may be a terminal device, or may be other media devices on the current session path, such as a media gateway, a media relay device, and the like.
- the path quality may include one or more of parameters such as MOS value, packet loss rate, delay, and jitter of the path.
- Step 302 The core network control node determines, according to the obtained end-to-end path quality of the current session and the path quality of the core network side, the cause of the deterioration of the current session path.
- Step 303 The core control node rejects the path switching request according to the determined cause of deterioration of the current session path, or reconstructs a media transmission path for the current session.
- the process of obtaining the end-to-end path quality of the current session path by the core network control node may be: the network element obtains the end-to-end path quality of the current session, and carries the control to the core network by using the path switch request. Or the core network control node actively queries the terminal device of the current session for the end-to-end path quality of the current session.
- the process of obtaining the path quality of the core network side of the current session by the core network control node may be:
- the core network control node queries the proxy node management server to query the path quality of the core network side on the current session path.
- the core network control node sends a path quality query request to the proxy node management server, where the query request includes node information of the path to be queried, and the proxy node management server measures the path quality of the path to be queried according to the path quality query request. And reported to the core network control node.
- the proxy node management server finds the proxy node closest to each node on the path to be queried according to the node information of the path to be queried included in the path quality query request, and measures the path of the proxy path formed by the found proxy nodes. Quality, and the path quality of the measured proxy path is reported to the core network control node as the path quality of the path to be queried.
- the core network control node determines the cause of the deterioration of the current session path according to the obtained end-to-end path quality of the current session and the path quality of the core network side, and may be: the core network control node acquires the The end-to-end path quality of the current session is compared with the quality of the core network side path. If the difference between the two meets the preset path quality threshold requirement, it is determined that the deterioration of the current session path is caused by the core network side path; If the difference does not meet the preset path quality threshold requirement, it is determined that the deterioration of the current session path is caused by the access network side path.
- the currently obtained path quality may include one or more parameters of a path, such as a MOS value, a packet loss rate, a delay, and a jitter, and the path quality threshold may be determined according to parameters included in the current path quality.
- the set path quality threshold can be set separately according to the parameters included in the path quality, or can be set in combination.
- the path quality threshold can be set to be less than 100ms and the packet loss rate difference is not greater than 3. %.
- the core network control node When it is determined that the deterioration of the current session path is caused by the core network side path, the core network control node reselects the media device for the current session, and notifies the terminal device on the current session to switch to the reselected media device, and reconstructs the current session.
- Media transfer path When it is determined that the deterioration of the current session path is caused by the core network side path, the core network control node reselects the media device for the current session, and notifies the terminal device on the current session to switch to the reselected media device, and reconstructs the current session.
- Media transfer path When it is determined that the deterioration of the current session path is caused by the core network side path, the core network control node reselects the media device for the current session, and notifies the terminal device on the current session to switch to the reselected media device, and reconstructs the current session.
- the core network control node rejects the path switch request when determining that the deterioration of the current session path is caused by the access network side path; or the core network control node reselects the access network node for the current session, and notifies the The terminal device switches to reselect the access network node, which is heavy for the current session. Create a media transmission path.
- the core network control node rejecting the path switch request may include: in the following case, the core network control node switches the request path to the originating path
- the element sends a reject message, rejecting the path switch request: the access network information of the two terminal devices on the current session that the core network control node fails to obtain; or the core network control node according to the acquired two terminals on the current session
- the access network information of the device can be aware that the two terminal devices on the current session path have no other available access network nodes; or the other available access network nodes of the two terminal devices on the current session path are not perceived. Allowed by the configured switching policy.
- the core network control node When it is determined that the deterioration of the current session path is caused by the access network side path, the core network control node reselects the access network node for the current session, and notifies the terminal device to switch to the reselection access network node, as the current session.
- Reconstructing the media transmission path may include: the core network control node is capable of acquiring access network information of two terminal devices on the current session path, and according to the acquired access network information, can be aware of any one of the session paths. If the terminal device or the two terminal devices have other available access network nodes, in the other available access network nodes that are perceived, one or two access network nodes are reselected for the current session, and the terminal in the current session is notified. The device switches to the reselected access network node to reestablish the media transmission path for the current session.
- the present invention further provides a path switching device, where the device includes: an obtaining unit, a determining unit, and an action unit, where the acquiring unit is configured to receive a path switch initiated by a network element in the current session.
- the determining unit is configured to determine the end-to-end path quality of the current session and the path quality of the core network side obtained according to the obtaining unit.
- the cause of the deterioration of the current session path the action unit, configured to reject the path switch request according to the cause of the deterioration of the current session path determined by the determining unit, or reestablish the media transmission path for the current session.
- the acquiring unit includes a first acquiring module and a second acquiring module, where An obtaining module, configured to obtain, by using the network element that initiates the path switching request, the end-to-end path quality of the current session, or by querying the terminal device of the current session for the end-to-end path quality of the current session; The path quality of the core network side on the current session path is queried by querying the proxy node management server.
- the determining unit may be configured to compare the end-to-end path quality of the current session acquired by the acquiring unit with the path quality of the core network side, if the difference between the two meets the preset path quality threshold requirement, Determining that the deterioration of the current session path is caused by the path of the core network side; if the difference between the two does not meet the preset path quality threshold requirement, determining that the deterioration of the current session path is caused by the path of the access network side; The current session path deterioration cause is sent to the action unit.
- the action unit may be configured to: receive a current session path deterioration cause sent by the determining unit; when the received current session path deterioration cause is a core network side path, reselect the media device for the current session, and notify the current The terminal device in the session switches to the reselected media device to re-establish the media transmission path for the current session; and when the received current session path deterioration cause is the access network side path, the network element sends the request to the network element that initiates the path switching request.
- Rejecting the message rejecting the path switching request; or, reselecting the access network node for the current session, and notifying the terminal device on the current session path to switch to the reselected access network node to reestablish the media transmission path for the current session.
- the path switching device provided by the present invention may be installed in a core network control node of an existing path switching system, or may be independently installed in an existing path switching system and connected to other network elements in the system.
- the present invention further provides a path switching system, the system mainly includes: a terminal device, an access network node, a core network control node, and a media device, wherein the core network control node includes the path switching device.
- the path switching system may further include: a proxy node management server, a proxy section The point management server, the acquiring unit of the core network control node obtains the path quality of the core network side on the current session path by querying the proxy node management server.
- FIG. 4 is a specific embodiment of a path switching system according to the present invention.
- the system mainly includes: a terminal device, an access network node, a core network control node, a media device, a proxy node management server, and a proxy node.
- the core network control node includes the path switching device (not shown in FIG. 4) provided by the present invention, and is responsible for establishing signaling interaction and media resource control between the terminal devices, and is capable of querying the session path to the proxy node management server. Network quality on the core network side.
- the core network control node can also acquire and save the access network information of the terminal device.
- the terminal device is specifically a user terminal that uses the SIP protocol, specifically, UE-A, UE-B shown in FIG.
- the access network node is an access device from the terminal device to the carrier network.
- different access networks have different access nodes.
- a terminal device may have multiple access modes, corresponding to different access network nodes, and FIG. 4 lists UE-A access network node A1 and access network node A2, UE B access network node B1 and Access network node B2.
- the media device is responsible for forwarding media packets between the terminal devices, between the terminal devices and the media devices, and between the media devices.
- the agent node management server is responsible for managing the overlay network composed of the agent nodes, including the keep-alive of the agent nodes, the management of network measurement tasks between the agent nodes, and the collection of network quality measurement data.
- the proxy node management server also provides an inquiry interface to the core network control node to return the network quality status between the specified network nodes.
- the proxy node located on the network side, and close to the network device of the user access node, is controlled by the proxy node management server, performs network quality measurement with other proxy nodes, and reports the measurement result to the proxy node management server.
- the media device and the proxy node may be the same physical device or different objects. Equipment.
- This embodiment describes an implementation process of performing path switching when the quality of the current session path deteriorates due to the deterioration of the path quality of the core network side: UE A and UE-B perform multimedia through the access network node A1 and the access network node B1.
- UE A and UE-B perform multimedia through the access network node A1 and the access network node B1.
- the UE-A detects that the current session path quality is degraded, it initiates a path switch request to the core network control node, and after receiving the path switch request, the core network control node obtains the end-to-end path quality of the current session path.
- the core network control node may be based on a certain policy, selecting one or more media devices as relays, and notifying UE_A and UE_B to switch the current session to the reselected media device, reconstructing the media transmission path of UE-A and UE-B, completing Path switching.
- the path switching process in this embodiment specifically includes the following steps:
- UE A and UE-B perform multimedia communication through the access network node A1 and the access network node B1;
- UE-A detects that the current session quality is degraded, and needs to perform a path switching request to the core network control node, where the path request message carries the end-to-end path quality Q1 of the current session path;
- UE-A perceives the process of the current session quality deterioration, which may be: UE-A obtains the session quality of the current session in real time, and detects that the current session quality does not meet the preset session quality threshold requirement, and determines the current session quality. Deterioration, path switching is required.
- the session quality may include any one or any combination of parameters such as a voice MOS value, a delay, a packet loss rate, and a jitter.
- the general voice service quality parameter requires that the MOS value is greater than 3.5, the delay is less than 300 ms, and the packet is lost.
- the rate is less than 5%, etc., and the corresponding session quality threshold can be set according to the requirement. For example, it can be set to:
- the session quality threshold requires a MOS value greater than 3.5, and / Or the delay is less than 300ms, and / or the packet loss rate is less than 5%.
- the core network control node After receiving the path switching request, the core network control node queries the proxy node management server to obtain the core network side path quality Q2 of the current session path;
- the core network side path of the current session path refers to the path between the access node A1 and the access node B
- the core network side path quality Q2 of the current session path refers to the access node A1 and the access node B1.
- the quality of the path between the paths is the core network side path of the current session path.
- the core network control node may send a query request to the proxy node management server, where the query request carries two endpoint information of the path to be queried, that is, the information of the access node A1 and the identifier or address of the access node B1.
- the proxy node management server finds the proxy node SA closest to the access node A1 and the proxy node SB closest to the access node B1, and measures the path quality between the proxy node SA and the proxy node SB.
- the measured path quality between the proxy node SA and the proxy node SB is reported to the core network control node as the path quality Q2 of the path between the access node A1 and the access node B1.
- the core network control node compares the end-to-end path quality Q1 carried in the path switching request with the core network-side path quality Q2, and obtains a path quality threshold that is not greater than a preset path quality threshold, and determines the current session path.
- the quality degradation is caused by the core network path, and the core network control node reselects the media device 1 as a relay for the current session.
- the core network control node may reselect the media device for the current session according to the load status of each media device in the current core network, and may select one media device or multiple media devices at the same time.
- the specific process is prior art, The invention will not be described in detail.
- the core network control node interacts with the media device 1 to reserve media resources for the current session;
- the core network control node reselects multiple media devices as relays for the current session, the resource reservation interaction needs to be performed separately for the selected multiple media devices.
- the core network control node notifies the UE B to perform the media path update, and notifies the UE B that The current session path is switched to the media device 1;
- the core control node returns a path switch response to the UE-A, notifying the UE-A to switch the current session path to the media device 1, and reconstructing the media transmission path for the current session;
- UE-A and UE-B continue to perform multimedia communication through the access network node Al, the media device 1, and the access network node B1.
- This embodiment describes another implementation process of performing path switching when the quality of the current session path deteriorates due to the deterioration of the quality of the path on the core network side: UE A and UE-B access through the access network node A1, media device 1, The network node B 1 performs multimedia communication, and the UE-A detects that the current session path quality is deteriorated, and then initiates a path switch request to the core network control node. After receiving the path switch request, the core network control node obtains the end of the current session path. The end path quality and the core network side path quality status, and determine that the end session path quality of the current session path is not much different from the core network side path quality, and determine that the current session path quality deterioration is caused by the core network.
- the network control node may reselect one or more media devices as a relay for the current session according to a certain policy, and notify the UE-A and the UE-B to switch the current session to the reselected media device, and reconstruct the UE-A and the UE-B media transmission path, complete path switching.
- the path switching process in this embodiment specifically includes the following steps:
- UE A and UE-B perform multimedia communication by using access network node A1, media device 1, and access network node B1;
- step S502 which is exactly the same as step S502;
- step S503 which is basically the same as step S503, except that the path on the core side in this embodiment is a path between the access node A1, the media device 1, and the access node B1, and the core network control node manages the service query to the proxy node.
- the core network side path quality Q2 is the path quality between the access node A1, the media device 1, and the access node B1;
- the proxy node management server receives the query sent by the core network control node. After seeking, find the proxy node SA closest to the access node A1, and the proxy node SB closest to the access node B1, measure the path quality between the proxy node SA and the media device 1, and the media device 1 and the proxy node SB. The quality of the path between the path quality of the proxy node SA and the media device 1 and the path quality between the media device 1 and the proxy node SB is reported as the path quality Q2 of the core network side to the core network control node. ;
- step S604) is substantially the same as step S504, except that in this embodiment, the core network is the current session reselection media device 2 as a relay;
- the core network control node interacts with the media device 2 to reserve media resources for the current session;
- the core network control node notifies the UE-B to perform the media path update, and notifies the UE-B to switch the current session path to the media device 2;
- the core control node returns a path switch response to the UE-A, notifying the UE-A to switch the current session path to the media device 2, and reconstructing the media transmission path for the current session;
- UE A and UE-B continue to perform multimedia communication through the access network node A1, the media device 2, and the access network node B1.
- the core network control node interacts with the media device 1 to release the media resources occupied by the current session on the media device 1.
- This embodiment describes another implementation process of performing path switching when the current session path quality deteriorates due to deterioration of the quality of the core network side path: UE A and UE-B access through the access network node A1, media device 1, and access
- the network node B1 performs multimedia communication, and the media device 1 of the core network senses that the current session path quality is deteriorated, and initiates a path switch request to the core network control node.
- the core network control node After receiving the path switch request, the core network control node obtains the end-to-end of the current session path.
- the path quality and the path quality of the core network side determine that the current session path quality deterioration is caused by the deterioration of the path quality of the core network side, and triggers the corresponding path switching process flow accordingly.
- the path switching process in this embodiment specifically includes the following steps:
- step S701) is identical to step S601;
- the media device 1 on the current session path senses that the current session quality is deteriorated, and initiates a path switch request to the core network control node.
- the media device may be a core network media gateway or a media relay device
- the current session quality may be perceived by the data transmission statistics of the current session, for example, the packet loss rate and jitter of the media packets of the current session are counted.
- a path switch request is initiated when the packet rate or jitter is above a set session quality threshold.
- the core network control node After receiving the path switching request, the core network control node queries UE-A for the end-to-end path quality Q1 of the current session path;
- the core network control node queries the proxy node management server for the core network side path quality of the current session path Q2;
- step S604 is identical to step S604;
- step S605 is identical to step S605;
- step S606 is identical to step S606;
- the core network control node notifies the UE-A to perform the media path update, and notifies the UE-A to switch the current session path to the media device 1;
- step S608 is exactly the same as step S608;
- step S710 is exactly the same as step S609.
- step S703 and step S704 may also be performed simultaneously, or step S704 may be performed first, and then step S703 is performed.
- This embodiment describes an implementation process of performing path switching when the quality of the current session path deteriorates due to deterioration of the path quality of the access network: UE_A and UE_B pass through the access network node A1.
- the media device 1 and the access network node B 1 perform multimedia communication, wherein the media device 1 may not exist as a media device on the core network side, and there may be one or more, and the UE-A perceives the session path quality to deteriorate.
- the core network control node initiates a path switch request, and after receiving the path switch request, the core network control node obtains the end-to-end path quality of the current session path and the path quality of the core network side, and obtains an end-to-end path quality of the current session path.
- the core network control node may choose to reject the path switching request of UE-A.
- the path switching process in this embodiment specifically includes the following steps:
- step S601 is identical to step S601;
- step S602 is identical to step S602;
- step S603 is identical to step S603;
- the core network control node compares the end-to-end path quality Q1 carried in the path switching request with the core network side path quality Q2, and obtains that the difference between the two is greater than a preset path quality threshold, and determines the current session path quality.
- the deterioration is caused by the access network path, and the core network control node decides to reject the path switching request of UE-A;
- the core network control node may decide to reject the path switch request of the terminal device in the following situations:
- the core network control node can collect multiple access network information of the terminal device through multiple registration of the terminal device, and according to the access network information of the terminal device, whether the terminal device has other available access network nodes. Specifically, the core network control node senses whether the UE-A and the UE-B have other available access network nodes according to the access network information of the UE-A and the UE-B, if neither UE A nor UE-B The available access network node decides to reject the UE-A path switch request.
- the second type the operator pre-configures the handover policy on the control node of the core network, and the control node of the core network can decide to reject the path switch request of the terminal device according to the configured handover policy.
- the configured handover policy may be that the handover to the designated one or more access network nodes is not allowed, and the core network control node finds the available access network node according to the access network information of the terminal device, if found The access network node decides to reject the path switch request of the terminal device just in the one or more access network nodes that are not allowed in the handover policy.
- the core network control node when the core network control node cannot obtain the access network information of the terminal device, it directly rejects the path switch request of the terminal device.
- the core network control node returns a path switch response to the UE- ⁇ , where the path switch response carries a reject message for rejecting the path switch request, and notifies the UE-A that the path switch request has been rejected;
- UE A and UE-B maintain the current session path unchanged, and continue to perform multimedia communication through the access network node Al, the media device 1, and the access network node B1.
- This embodiment describes another implementation process of performing path switching when the current session path quality deteriorates due to the deterioration of the path quality of the access network: UE A and UE-B perform through the access network node A1 and the access network node B1. Multimedia communication.
- the UE-A senses that the session path quality is deteriorated, and initiates a path switch request to the core network control node. After receiving the path switch request, the core network control node obtains the end-to-end path quality of the current session path and the path quality of the core network side.
- the end-to-end path quality of the current session path is significantly worse than the quality of the core network side path, and determining that the current session path quality deterioration is caused by the deterioration of the path quality of the access network side, at this time, the core network control node may notify the UE-A. And / or UE - B, switch to other access network nodes, and re-establish the media transmission path.
- the path switching process in this embodiment specifically includes the following steps:
- step S501 is identical to step S501;
- step S502 is identical to step S502;
- step S503 is identical to step S503; 5904)
- the core network control node compares the end-to-end path quality Q1 carried in the path switch request with the core network-side path quality Q2, and obtains a difference between the two, which is greater than a preset path quality threshold, and determines the current session path quality. The deterioration is caused by the access network path.
- the core network control node senses that UE-A and/or UE-B have other available access network nodes, and decides to switch UE A to the new access network node A2.
- the UE-B switches to the new access network node B2; specifically, the core network control node senses that UE-A and/or UE-B have other available according to the access network information of UE-A and UE-B.
- the access network node reselects the access network node for UE-A and/or UE-B.
- the core network control node notifies the UE-B to update to the access network node B2 for communication; S906) the core network control node returns a path switch response to the UE-A, notifying the UE-B to switch to the access network node A2 for communication ;
- both the UE-A and the UE-B may reselect the access network node, and both UE-A and UE-B are switched to the re-selected access network node, and also The UE may be re-selected and switched only by any one of the UE-A and the UE-B.
- the control node of the core network determines whether the access network information of UE-A and UE-B collected by itself is determined.
- the process of reselecting the access network node and whether to switch to the reselected access network node is a prior art, and those skilled in the art can combine the prior art with the present invention according to the technical means commonly used in the art. Implement path switching.
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Description
一种路径切换方法及装置、 系统 技术领域
本发明涉及通信领域 IP承载网络的路径保护技术， 尤其涉及一种路径 切换方法及装置、 系统。 背景技术
通信技术的快速发展带来了通信网络的日益更新， 但是网络的高可靠 性始终是最基础最关键的性能要求。 为达到业务中的各种性能指标， IP承 载网络在设备、 路径、 网络等各个层次与环节引入了多种保护技术来监测 承载网络状况， 发现故障设备并进行路径切换。
IP承载网络的路径保护技术的一种通用模式下的网络系统结构，如图 1 所示， 其中， 虚线表示终端设备 A ( UE_A )和终端设备 B ( UE B )之间 信令流的传输路径，实线表示 UE— A和 UE— B之间媒体流的传输路径。 UE— A 和 UE— B在核心网控制节点的协助下， 通过接入网节点 A1、 媒体设备 1、 接入网节点 B1建立媒体面传输路径。当 UE— A或 UE— B在会话过程中感知 到 QoS变差， 将向核心网控制节点发起会话切换请求， 核心网控制节点再 次为 UE— A和 UE— B协商媒体传输路径， 最终 UE— A和 UE— B通过接入网 节点 Al、 媒体设备 2、 接入网节点 B1建立新的媒体面传输路径。
上述 UE— A和 UE— B之间路径切换的具体实现过程， 如图 2所示， 主 要包括以下步驟：
5201 ) UE A和 UE— B通过接入网节点 Al、 媒体设备 1、 接入网节点 B1进行多媒体通信；
5202 )UE— A感知会话质量变差，向核心网控制节点发出路径更换请求； 具体地， UE A可以感知当前路径的端到端路径质量，在感知到当前路
径的端到端路径质量较差时， 向核心网控制节点发出路径更换请求。
S203 )核心网控制节点接收到 UE— A发送的路径更换请求后， 根据核 心网内各媒体设备的负荷状况， 重新选择媒体设备 2作为 UE— A与 UE— B 之间的中继， 为 UE— A及 UE— B建立新的媒体路径， 核心网控制节点与媒 体设备 2交互， 为当前会话预留媒体资源；
S204 )核心网控制节点与 UE— B交互进行会话媒体信息更新；
5205 )核心网控制节点向 UE— A返回媒体路径更新响应；
5206 ) UE A和 UE— B通过接入网节点 Al、 媒体设备 2、 接入网节点 B1 , 继续进行多媒体通信；
5207 )核心网控制节点与媒体设备 1交互，释放当前会话在媒体设备 1 上占用的资源， 完成当前路径切换。
随着终端设备和接入网技术的飞速发展， 多模终端设备、 多种接入方 式使得接入网网络越来越复杂， 导致会话过程中端到端的承载路径复杂化。 而上述路径切换方案虽然能够保证在端到端的路径质量恶化时触发路径切 换流程， 而核心网控制节点在接收到路径切换请求后， 在没有找到当前端 到端路径中导致路径质量恶化的原因之前， 就直接根据当前核心网内的媒 体设备负荷状态， 为 UE选择新的媒体设备， 并重新建立媒体路径。 这样， 如果由于终端设备接入网部分的路径恶化而导致当前端到端路径的路径质 量恶化时， 核心网控制节点仍然采用上述方案进行路径切换， 切换后的端 到端路径可能质量也是较差的， 以至于未能达到改善端到端路径质量的目 的。 发明内容
有鉴于此， 本发明的主要目的在于提供一种路径切换方法及装置、 系 统， 以解决现有的路径切换方案不能针对当前端到端路径质量恶化的原因 进行路径切换的问题。
为达到上述目的， 本发明的技术方案是这样实现的：
本发明提供了一种路径切换方法， 所述方法包括： 在接收到当前会话 中的网元发起的路径切换请求后， 核心网控制节点获取当前会话的端到端 路径质量、 以及核心网侧路径质量； 所述核心网控制节点根据所获取到的 当前会话的端到端路径质量、 与核心网侧路径质量， 确定当前会话路径的 恶化原因； 根据确定的当前会话路径的恶化原因， 所述核心控制节点拒绝 所述路径切换请求， 或为当前会话重建媒体传输路径。
在上述方案中， 所述发起路径切换请求的网元具体为： 当前会话路径 上的终端设备、 或媒体网关、 或媒体中继设备。
在上述方案中， 所述核心网控制节点获取当前会话路径的端到端路径 质量， 具体为： 所述网元获得当前会话的端到端路径质量， 并通过所述路 径切换请求携带给所述核心网控制节点； 或者， 所述核心网控制节点主动 向当前会话的终端设备查询当前会话的端到端路径质量。
在上述方案中， 所述核心网控制节点获取当前会话的核心网侧路径质 量， 具体为： 核心网控制节点通过向代理节点管理服务器查询当前会话路 径上核心网侧的路径质量。
在上述方案中， 所述核心网控制节点根据所获取到的当前会话的端到 端路径质量、 与核心网侧路径质量， 确定当前会话路径的恶化原因， 具体 为： 所述核心网控制节点将所获取到的当前会话的端到端路径质量与核心 网侧路径质量进行比较， 如果两者的差值符合预设的路径质量阈值要求， 则确定当前会话路径的恶化由核心网侧路径引起； 如果两者的差值不符合 预设的路径质量阈值要求， 则确定当前会话路径的恶化由接入网侧路径 I 起。
在上述方案中， 根据确定的当前会话路径的恶化原因， 所述核心控制 节点拒绝所述路径切换请求， 或为当前会话重建媒体传输路径， 具体包括：
在确定当前会话路径的恶化由核心网侧路径引起时， 所述核心网控制节点 为当前会话重选媒体设备， 并通知当前会话上的终端设备切换到重选的媒 体设备上， 为当前会话重建媒体传输路径； 在确定当前会话路径的恶化由 接入网侧路径引起时， 所述核心网控制节点向所述发起路径切换请求的网 元发送拒绝消息， 拒绝所述路径切换请求； 或者， 所述核心网控制节点为 当前会话重选接入网节点， 并通知当前会话路径上的终端设备切换到重选 接入网节点上， 为当前会话重建媒体传输路径。
在上述方案中， 在确定当前会话路径的恶化由接入网侧路径引起时， 所述核心网控制节点拒绝所述路径切换请求， 具体包括： 在以下情况下， 核心网控制节点向所述发起路径切换请求的网元发送拒绝消息， 拒绝所述 路径切换请求： 核心网控制节点未能获取到的当前会话上两个终端设备的 接入网信息； 或者， 核心网控制节点根据已获取到的当前会话上两个终端 设备的接入网信息， 能感知当前会话路径上两个终端设备都没有其他可用 接入网节点； 或者， 所感知到的当前会话路径上两个终端设备的其他可用 接入网节点， 均不被已配置的切换策略所允许。
在上述方案中， 在确定当前会话路径的恶化由接入网侧路径引起时， 所述核心网控制节点为当前会话重选接入网节点， 并通知当前会话路径上 的终端设备切换到重选接入网节点上， 为当前会话重建媒体传输路径， 具 体包括： 所述核心网控制节点能够获取到当前会话路径上两个终端设备的 接入网信息， 并且根据所获取到的接入网信息， 能够感到当会话路径上任 意一个终端设备或两个终端设备有其他可用的接入网节点， 则在所感知的 其他可用接入网节点中， 为当前会话重选一个或两个接入网节点， 并通知 当前会话上的终端设备切换到重选的接入网节点上， 为当前会话重建媒体 传输路径。
本发明还提供了一种路径切换装置， 所述装置包括： 获取单元、 确定
单元和动作单元， 其中， 获取单元， 用于在接收到当前会话中的网元发起 的路径切换请求后， 获取当前会话的端到端路径质量、 以及核心网侧路径 质量； 确定单元， 用于根据所述获取单元获取到的当前会话的端到端路径 质量、 与核心网侧路径质量， 确定当前会话路径的恶化原因； 动作单元， 用于根据所述确定单元确定的当前会话路径的恶化原因， 拒绝所述路径切 换请求， 或为当前会话重建媒体传输路径。
在上述方案中， 所述获取单元包括第一获取模块和第二获取模块， 其 中， 第一获取模块， 用于通过所述发起路径切换请求的网元获得当前会话 的端到端路径质量， 或者通过向当前会话的终端设备查询当前会话的端到 端路径质量； 第二获取模块， 用于通过向代理节点管理服务器查询当前会 话路径上核心网侧的路径质量。
在上述方案中， 所述确定单元， 具体用于， 将所述获取单元获取到的 当前会话的端到端路径质量与核心网侧路径质量进行比较， 如果两者的差 值符合预设的路径质量阈值要求， 则确定当前会话路径的恶化由核心网侧 路径引起； 如果两者的差值不符合预设的路径质量阈值要求， 则确定当前 会话路径的恶化由接入网侧路径引起； 并将所确定的当前会话路径恶化原 因发送给所述动作单元。
在上述方案中， 所述动作单元， 具体用于， 接收所述确定单元发送的 当前会话路径恶化原因； 在接收到的当前会话路径恶化原因为核心网侧路 径时， 为当前会话重选媒体设备， 并通知当前会话上的终端设备切换到重 选的媒体设备上， 为当前会话重建媒体传输路径； 在接收到的当前会话路 径恶化原因为接入网侧路径时， 向所述发起路径切换请求的网元发送拒绝 消息， 拒绝所述路径切换请求； 或者， 为当前会话重选接入网节点， 并通 知当前会话路径上的终端设备切换到重选接入网节点上， 为当前会话重建 媒体传输路径。
本发明还提供了一种路径切换系统， 所述系统包括： 终端设备、 接入 网节点、 核心网控制节点和媒体设备， 其中， 核心网控制节点包括： 获取 单元、 确定单元和动作单元， 其中， 获取单元， 用于在接收到当前会话中 的网元发起的路径切换请求后， 获取当前会话的端到端路径质量、 以及核 心网侧路径质量； 确定单元， 用于根据所述获取单元获取到的当前会话的 端到端路径质量、 与核心网侧路径质量， 确定当前会话路径的恶化原因； 动作单元， 用于根据所述确定单元确定的当前会话路径的恶化原因， 拒绝 所述路径切换请求， 或为当前会话重建媒体传输路径。
在上述方案中， 所述系统还包括： 代理节点管理服务器， 所述核心网 控制节点的获取单元通过向该代理节点管理服务器查询得到当前会话路径 上核心网侧的路径质量。
本发明所提供的路径切换方法及装置， 根据所获取的当前会话路径的 端到端路径质量、 以及核心网侧路径质量， 确定当前会话路径恶化的原因， 在针对当前会话路径恶化的原因， 采取相应的路径切换操作， 从而能够将 接入网引起的路径质量恶化、 与核心网引起的路径质量恶化区分开， 并根 据不同的路径质量恶化原因进行更合理的路径切换处理， 确保能够通过切 换路径来改善端到端路径质量， 从而有效提高路径切换改善路径质量的效 率， 并有效提高用户体验。 附图说明
图 1是现有技术中路径切换的网络结构示意图；
图 2是现有技术中路径切换方法的实现流程示意图；
图 3是本发明路径切换方法的实现流程图；
图 4是本发明路径切换装置的一种网络结构示意图；
图 5是本发明实施例一的路径切换方法的流程图；
图 6是本发明实施例二的路径切换方法的流程图；
图 7是本发明实施例三的路径切换方法的流程图；
图 8是本发明实施例四的路径切换方法的流程图；
图 9是本发明实施例五的路径切换方法的流程图。 具体实施方式
本发明的基本思想是： 核心网控制节点根据当前会话的端到端路径质 量、 以及当前会话的核心网路径质量， 确定当前会话的路径质量恶化原因， 并根据确定的路径恶化原因， 进行相应的路径切换处理。
本发明的路径切换方法， 参照图 3所示， 主要包括：
步驟 301 : 在接收到当前会话中的网元发起的路径切换请求后，核心网 控制节点获取当前会话的端到端路径质量、 以及核心网侧路径质量；
这里， 发起路径切换请求的所述网元可以是终端设备， 也可以是当前 会话路径上的其它媒体设备， 如媒体网关、 媒体中继设备等。
这里， 上述的路径质量可以包含路径的 MOS值、 丟包率、 时延、 抖动 等参数的一种或多种。
步驟 302:所述核心网控制节点根据所获取到的当前会话的端到端路径 质量、 与核心网侧路径质量， 确定当前会话路径的恶化原因；
步驟 303: 根据确定的当前会话路径的恶化原因， 所述核心控制节点拒 绝所述路径切换请求， 或为当前会话重建媒体传输路径。
其中， 核心网控制节点获取当前会话路径的端到端路径质量的过程， 可以是： 所述网元获得当前会话的端到端路径质量， 并通过所述路径切换 请求携带给所述核心网控制节点； 或者， 所述核心网控制节点主动向当前 会话的终端设备查询当前会话的端到端路径质量。
其中， 核心网控制节点获取当前会话的核心网侧路径质量的过程， 可 以是： 核心网控制节点通过向代理节点管理服务器查询当前会话路径上核 心网侧的路径质量。
具体地， 核心网控制节点向代理节点管理服务器发送路径质量查询请 求， 该查询请求包含了要查询路径的节点信息， 代理节点管理服务器根据 所述路径质量查询请求， 测量出要查询路径的路径质量， 并上报给所述核 心网控制节点。
这里， 代理节点管理服务器根据所述路径质量查询请求中包含的要查 询路径的节点信息， 找到最靠近要查询路径上各节点的代理节点， 测量由 所找到的各代理节点构成的代理路径的路径质量， 并将所测得的代理路径 的路径质量作为要查询路径的路径质量上报给核心网控制节点。
其中， 所述核心网控制节点根据所获取到的当前会话的端到端路径质 量、 与核心网侧路径质量， 确定当前会话路径的恶化原因， 可以为： 所述 核心网控制节点将所获取到的当前会话的端到端路径质量与核心网侧路径 质量进行比较， 如果两者的差值符合预设的路径质量阈值要求， 则确定当 前会话路径的恶化由核心网侧路径引起； 如果两者的差值不符合预设的路 径质量阈值要求， 则确定当前会话路径的恶化由接入网侧路径引起。
具体地， 当前获取到的路径质量可以包含路径的 MOS值、 丟包率、 时 延、 抖动等参数的一种或多种， 所述路径质量阈值的设置可以根据当前路 径质量所包含参数来确定， 所设置的路径质量阈值可以根据路径质量中包 含的参数进行分别设置， 或者进行组合设置， 例如， 可以设置为： 路径质 量阈值要求时延差值不大于 100ms且丟包率差值不大于 3%。
在确定当前会话路径的恶化由核心网侧路径引起时， 所述核心网控制 节点为当前会话重选媒体设备， 并通知当前会话上的终端设备切换到重选 的媒体设备上 , 为当前会话重建媒体传输路径。
在确定当前会话路径的恶化由接入网侧路径引起时， 所述核心网控制 节点拒绝所述路径切换请求； 或者， 所述核心网控制节点为当前会话重选 接入网节点， 并通知该终端设备切换到重选接入网节点上， 为当前会话重
建媒体传输路径。
在确定当前会话路径的恶化由接入网侧路径引起时， 所述核心网控制 节点拒绝所述路径切换请求， 可以包括： 在以下情况下， 核心网控制节点 向所述发起路径切换请求的网元发送拒绝消息， 拒绝所述路径切换请求： 核心网控制节点未能获取到的当前会话上两个终端设备的接入网信息； 或 者核心网控制节点根据已获取到的当前会话上两个终端设备的接入网信 息， 能感知当前会话路径上两个终端设备都没有其他可用接入网节点； 或 者所感知到的当前会话路径上两个终端设备的其他可用接入网节点， 均不 被已配置的切换策略所允许。
在确定当前会话路径的恶化由接入网侧路径引起时， 所述核心网控制 节点为当前会话重选接入网节点， 并通知该终端设备切换到重选接入网节 点上， 为当前会话重建媒体传输路径， 可以包括： 所述核心网控制节点能 够获取到当前会话路径上两个终端设备的接入网信息， 并且根据所获取到 的接入网信息， 能够感知当会话路径上任意一个终端设备或两个终端设备 有其他可用的接入网节点， 则在所感知的其他可用接入网节点中， 为当前 会话重选一个或两个接入网节点， 并通知当前会话上的终端设备切换到重 选的接入网节点上， 为当前会话重建媒体传输路径。
为了实现上述方法， 本发明还提供了一种路径切换装置， 所述装置包 括： 获取单元、 确定单元和动作单元， 其中， 获取单元， 用于在接收到当 前会话中的网元发起的路径切换请求后， 获取当前会话的端到端路径质量、 以及核心网侧路径质量； 确定单元， 用于根据所述获取单元获取到的当前 会话的端到端路径质量、 与核心网侧路径质量， 确定当前会话路径的恶化 原因； 动作单元， 用于根据所述确定单元确定的当前会话路径的恶化原因， 拒绝所述路径切换请求， 或为当前会话重建媒体传输路径。
其中， 所述获取单元包括第一获取模块和第二获取模块， 其中， 第一
获取模块， 用于通过所述发起路径切换请求的网元获得当前会话的端到端 路径质量， 或者通过向当前会话的终端设备查询当前会话的端到端路径质 量； 第二获取模块， 用于通过向代理节点管理服务器查询当前会话路径上 核心网侧的路径质量。
其中， 所述确定单元可以用于， 将所述获取单元获取到的当前会话的 端到端路径质量与核心网侧路径质量进行比较， 如果两者的差值符合预设 的路径质量阈值要求， 则确定当前会话路径的恶化由核心网侧路径引起； 如果两者的差值不符合预设的路径质量阈值要求， 则确定当前会话路径的 恶化由接入网侧路径引起； 并将所确定的当前会话路径恶化原因发送给所 述动作单元。
这里， 所述动作单元可以用于， 接收所述确定单元发送的当前会话路 径恶化原因； 在接收到的当前会话路径恶化原因为核心网侧路径时， 为当 前会话重选媒体设备， 并通知当前会话上的终端设备切换到重选的媒体设 备上， 为当前会话重建媒体传输路径； 在接收到的当前会话路径恶化原因 为接入网侧路径时， 向所述发起路径切换请求的网元发送拒绝消息， 拒绝 所述路径切换请求； 或者， 为当前会话重选接入网节点， 并通知当前会话 路径上的终端设备切换到重选接入网节点上， 为当前会话重建媒体传输路 径。
本发明所提供的路径切换装置， 可以设置在现有路径切换系统的核心 网控制节点中， 也可以独立设置在现有的路径切换系统中， 与该系统中的 其他网元相连接。
另外， 本发明还提供了一种路径切换系统， 该系统主要包括： 终端设 备、 接入网节点、 核心网控制节点、 媒体设备， 其中， 核心网控制节点包 含有上述的路径切换装置。
其中， 所述路径切换系统还可以包括： 代理节点管理服务器， 代理节
点管理服务器， 所述核心网控制节点的获取单元通过向该代理节点管理服 务器查询得到当前会话路径上核心网侧的路径质量。
图 4为本发明所提供的路径切换系统一种具体实施例， 该系统主要包 括： 终端设备、 接入网节点、 核心网控制节点、 媒体设备、 代理节点管理 服务器、 代理节点。
其中， 核心网控制节点包含有本发明所提供的路径切换装置 （图 4 中 未示）， 负责终端设备之间建立通信路径的信令交互与媒体资源控制， 能够 向代理节点管理服务器查询会话路径上核心网侧的网络质量。 另外， 核心 网控制节点还可以获取并保存终端设备的接入网信息。
其中， 终端设备具体为使用 SIP协议的用户终端， 具体为图 4中所示 的 UE— A、 UE— B。
接入网节点为终端设备到运营商网络的接入设备， 一般不同的接入网 有不同的接入节点。 一个终端设备可以有多种接入方式， 对应不同的接入 网节点，图 4中列出了 UE— A的接入网节点 A1和接入网节点 A2, UE B 的 接入网节点 B1和接入网节点 B2。
媒体设备负责为终端设备之间、 终端设备与媒体设备之间、 媒体设备 之间转发媒体报文。
代理节点管理服务器， 负责管理代理节点组成的叠加网， 包括代理节 点的保活、 代理节点之间网络测量任务的管理、 网络质量测量数据的收集 等。 代理节点管理服务器还向核心网控制节点提供查询接口， 返回指定网 络节点之间的网络质量状况。
代理节点， 位于网络侧， 且靠近用户接入节点的网络设备， 受代理节 点管理服务器控制， 与其它代理节点之间进行网络质量测量， 并将测量结 果上报给代理节点管理服务器。
其中， 媒体设备与代理节点可以是同一物理设备， 也可以是不同的物
理设备。
实施例一
本实施例描述了由于核心网侧路径质量恶化而引起当前会话路径质量 变差时进行路径切换的一种实现过程： UE A与 UE— B 通过接入网节点 A1、 接入网节点 B1进行多媒体通信， UE— A感知到当前会话路径质量变差时， 向核心网控制节点发起路径切换请求， 核心网控制节点接收到所述路径切 换请求后， 获取到当前会话路径的端到端路径质量、 以及核心网侧路径质 量状态， 并判断当前会话路径的端到端路径质量与核心网侧路径质量相差 不大， 确定当前会话路径质量恶化由核心网引起的， 此时， 核心网控制节 点可以根据一定的策略，选择一个或多个媒体设备作为中继， 并通知 UE— A 和 UE— B将当前会话切换到重选的媒体设备上， 重建 UE— A与 UE— B的媒 体传输路径， 完成路径切换。
如图 5所示， 本实施例的路径切换流程， 具体包括以下步驟：
5501 ) UE A和 UE— B 通过接入网节点 Al、 接入网节点 B1进行多媒 体通信；
5502 ) UE— A感知到当前会话质量变差， 需要进行路径切换时， 向核心 网控制节点发起路径切换请求， 所述路径请求消息携带当前会话路径的端 到端路径质量 Q1 ;
这里， UE— A感知当前会话质量变差的过程， 具体可以是： UE— A实时 获得当前会话的会话质量， 检测到当前会话质量不符合预先设定的会话质 量阈值要求， 则确定当前会话质量变差， 需要进行路径切换。
这里， 所述会话质量可以包括语音 MOS值、 时延、 丟包率、 抖动等参 数的任意一种或任意组合， 一般的语音业务质量参数要求为 MOS值大于 3.5、 时延小于 300ms、 丟包率小于 5%等， 可以根据该要求来设置相应的会 话质量阈值。 例如， 可以设置为： 会话质量阈值要求 MOS值大于 3.5、 和 /
或时延小于 300ms、 和 /或丟包率小于 5%。
5503 )核心网控制节点接收到所述路径切换请求后， 向代理节点管理 服务器查询得到当前会话路径的核心网侧路径质量 Q2;
这里， 当前会话路径的核心网侧路径是指接入节点 Al、 接入节点 B1 之间的路径，所述当前会话路径的核心网侧路径质量 Q2是指接入节点 A1、 接入节点 B 1之间路径的路径质量。
具体地， 核心网控制节点可以向代理节点管理服务器发送查询请求， 该查询请求中携带有要查询路径的两个端点信息， 即接入节点 Al、 以及接 入节点 B1的标识或地址等信息，代理节点管理服务器接收到该查询请求之 后， 查找出最靠近接入节点 A1 的代理节点 SA、 以及最靠近接入节点 B1 的代理节点 SB, 测量代理节点 SA和代理节点 SB之间的路径质量， 并将 测量到的代理节点 SA和代理节点 SB之间的路径质量作为接入节点 A1与 接入节点 B1之间路径的路径质量 Q2, 上报给所述核心网控制节点。
5504 )核心网控制节点将所述路径切换请求中携带的端到端路径质量 Q1与核心网侧路径质量 Q2进行比较， 得到两者差值不大于预先设置的路 径质量阈值， 则确定当前会话路径质量恶化是由核心网路径引起的， 核心 网控制节点为当前会话重选媒体设备 1作为中继。
这里， 核心网控制节点可以根据当前核心网内各媒体设备的负荷状态， 为当前会话重选媒体设备， 可以选择一个媒体设备， 也可以同时选择多个 媒体设备， 具体过程是现有技术， 本发明不再详述。
5505 )核心网控制节点与媒体设备 1 进行交互， 为当前会话预留媒体 资源；
这里， 如果核心网控制节点为当前会话重选了多个媒体设备作为中继， 则需要分别向所选择的多个媒体设备进行资源预留交互。
S506 )核心网控制节点通知 UE B 进行媒体路径更新， 通知 UE B将
当前会话路径切换到媒体设备 1上；
5507 )核心控制节点向 UE— A返回路径切换响应， 通知 UE— A将当前 会话路径切换到媒体设备 1上， 为当前会话重建媒体传输路径；
5508 ) UE— A和 UE— B 通过接入网节点 Al、 媒体设备 1、 接入网节点 B1继续进行多媒体通信。
实施例二
本实施例描述了由于核心网侧路径质量恶化而引起当前会话路径质量 变差时进行路径切换的另一种实现过程： UE A和 UE— B 通过接入网节点 A1、 媒体设备 1、 接入网节点 B 1进行多媒体通信， UE— A感知当前会话路 径质量变差， 则向核心网控制节点发起路径切换请求， 核心网控制节点接 收到所述路径切换请求后， 获取到当前会话路径的端到端路径质量、 以及 核心网侧路径质量状态， 并判断当前会话路径的端到端路径质量与核心网 侧路径质量相差不大， 确定当前会话路径质量恶化由核心网引起的， 此时， 核心网控制节点可以根据一定的策略， 为当前会话重选一个或多个媒体设 备作为中继， 并通知 UE— A和 UE— B将当前会话切换到重选的媒体设备上， 重建 UE— A与 UE— B的媒体传输路径， 完成路径切换。
如图 6所示， 本实施例的路径切换流程， 具体包括以下步驟：
5601 , UE A和 UE— B 通过接入网节点 A1、 媒体设备 1、 接入网节点 B1进行多媒体通信；
5602, 与步驟 S502完全相同;
5603 , 与步驟 S503基本相同， 所不同的是， 本实施例中核心侧的路径 为接入节点 Al、媒体设备 1、接入节点 B1之间的路径，核心网控制节点向 代理节点管理服务查询的核心网侧路径质量 Q2为接入节点 Al、 媒体设备 1、 接入节点 B 1之间的路径质量；
具体地， 代理节点管理服务器在接收到核心网控制节点发出的查询请
求后， 查找到最靠近接入节点 Al的代理节点 SA、 以及最靠近接入节点 Bl 的代理节点 SB, 测量代理节点 SA与媒体设备 1之间的路径质量、 以及媒 体设备 1和代理节点 SB之间的路径质量， 并将代理节点 SA与媒体设备 1 之间的路径质量与媒体设备 1和代理节点 SB之间的路径质量之和作为核心 网侧的路径质量 Q2, 上报给核心网控制节点；
S604 )与步驟 S504基本相同， 所不同的是， 本实施例中核心网为当前 会话重选媒体设备 2作为中继；
S605 )核心网控制节点与媒体设备 2进行交互， 为当前会话预留媒体 资源；
S606 )核心网控制节点通知 UE— B 进行媒体路径更新， 通知 UE— B将 当前会话路径切换到媒体设备 2上；
5607 )核心控制节点向 UE— A返回路径切换响应， 通知 UE— A将当前 会话路径切换到媒体设备 2上， 为当前会话重建媒体传输路径；
5608 ) UE A和 UE— B 通过接入网节点 A1、 媒体设备 2、 接入网节点 B1继续进行多媒体通信。
S609 )核心网控制节点与媒体设备 1 进行交互， 释放当前会话在媒体 设备 1上占用的媒体资源。
实施例三
本实施例描述了由于核心网侧路径质量恶化而引起当前会话路径质量 变差时进行路径切换的另一种实现过程： UE A和 UE— B 通过接入网节点 Al、 媒体设备 1、 接入网节点 B1进行多媒体通信， 核心网的媒体设备 1感 知当前会话路径质量变差， 向核心网控制节点发起路径切换请求， 核心网 控制节点接收到路径切换请求后， 获取当前会话路径的端到端路径质量、 以及核心网侧路径质量， 确定当前会话路径质量恶化是由核心网侧路径质 量变差引起的， 并据此触发相应的路径切换处理流程。
如图 7所示， 本实施例的路径切换流程， 具体包括以下步驟：
S701 )与步驟 S601完全相同；
S702 ) 当前会话路径上的媒体设备 1感知到当前会话质量变差， 向核 心网控制节点发起路径切换请求；
这里， 媒体设备可以是核心网媒体网关或媒体中继设备， 可以通过当 前会话的数据传输统计结果来感知当前会话质量， 如统计当前会话的媒体 报文的丟包率及抖动等参数， 在丟包率或抖动高于设定的会话质量阈值时， 发起路径切换请求。
5703 )核心网控制节点接收到所述路径切换请求后， 向 UE— A查询当 前会话路径的端到端路径质量 Q1 ;
5704 )核心网控制节点向代理节点管理服务器查询当前会话路径的核 心网侧路径质量 Q2;
这里， 具体实现过程与步驟 603完全相同。
5705 )与步驟 S604完全相同；
5706 )与步驟 S605完全相同；
5707 )与步驟 S606完全相同；
5708 )核心网控制节点通知 UE— A进行媒体路径更新， 通知 UE— A将 当前会话路径切换到媒体设备 1上；
5709 ) 与步驟 S608完全相同；。
S710 ) 与步驟 S609完全相同。
这里， 步驟 S703和步驟 S704还可以同时进行， 或者， 也可以先执行 步驟 S704, 再执行步驟 S703。
实施例四
本实施例描述了由于接入网路径质量恶化而引起当前会话路径质量变 差时进行路径切换的一种实现过程： UE— A和 UE— B 通过接入网节点 A1、
媒体设备 1、 接入网节点 B 1进行多媒体通信， 其中， 所述媒体设备 1作为 核心网侧的媒体设备可能不存在，也可能存在一个及以上， UE— A感知会话 路径质量变差， 向核心网控制节点发起路径切换请求， 核心网控制节点接 收到所述路径切换请求后， 获取当前会话路径的端到端路径质量、 以及核 心网侧路径质量， 得到当前会话路径上端到端路径质量明显差于核心网侧 路径质量， 确定当前会话路径质量恶化是由接入网侧路径质量变差 ！起的 , 此时， 核心网控制节点可以选择拒绝 UE— A的路径切换请求。
如图 8所示， 本实施例的路径切换流程， 具体包括以下步驟：
5801 ) 与步驟 S601完全相同；
5802 ) 与步驟 S602完全相同；
5803 )与步驟 S603完全相同；
5804 )核心网控制节点将所述路径切换请求中携带的端到端路径质量 Q1与核心网侧路径质量 Q2进行比较， 得到两者差值大于预先设置的路径 质量阈值， 则确定当前会话路径质量恶化是由接入网路径引起的， 核心网 控制节点决定拒绝 UE— A的路径切换请求；
其中， 核心网控制节点可以在以下几种情况下， 决定拒绝终端设备的 路径切换请求：
第一种： 核心网控制节点可以通过终端设备的多注册收集终端设备的 多种接入网信息， 根据终端设备的接入网信息， 感知终端设备是否还有其 他可用的接入网节点。 具体地， 核心网控制节点根据 UE— A、 以及 UE— B的 接入网信息， 感知 UE— A、 以及 UE—B是否有其他可用的接入网节点， 如果 UE A和 UE— B都没有可用的接入网节点，则决定拒绝 UE— A的路径切换请 求。
第二种： 运营商在核心网控制节点上预先配置切换策略， 核心网控制 节点可以根据所配置的切换策略， 决定拒绝终端设备的路径切换请求， 例
如， 所配置的切换策略可以是不允许切换到指定的一个或多个接入网节点， 核心网控制节点根据终端设备的接入网信息， 找到可用的接入网节点后， 如果所找到的接入网节点正好在所述切换策略中指定的不允许的一个或多 个接入网节点中， 则决定拒绝终端设备的路径切换请求。
第三种， 核心网控制节点在无法获取到终端设备的接入网信息时， 直 接拒绝终端设备的路径切换请求。
S805 )核心网控制节点向 UE— Α返回路径切换响应， 该路径切换响应 中携带有用于拒绝所述路径切换请求的拒绝消息， 通知 UE— A其路径切换 请求已被拒绝；
S806 ) UE A与 UE— B之间保持当前会话路径不变， 继续通过接入网 节点 Al、 媒体设备 1、 接入网节点 B1进行多媒体通信。
实施例五
本实施例描述了由于接入网路径质量恶化而引起当前会话路径质量变 差时进行路径切换的另一种实现过程： UE A和 UE— B 通过接入网节点 A1、 接入网节点 B1进行多媒体通信。 UE— A感知会话路径质量变差， 向核心网 控制节点发起路径切换请求， 核心网控制节点接收到所述路径切换请求后， 获取当前会话路径的端到端路径质量、 以及核心网侧路径质量， 得到当前 会话路径上端到端路径质量明显差于核心网侧路径质量， 确定当前会话路 径质量恶化是由接入网侧路径质量变差引起的， 此时， 核心网控制节点可 以通知 UE— A和 /或 UE— B, 切换到其他的接入网节点， 重新建立媒体传输 路径。
如图 9所示， 本实施例的路径切换流程， 具体包括以下步驟：
5901 )与步驟 S501完全相同；
5902 ) 与步驟 S502完全相同；
5903 ) 与步驟 S503完全相同；
5904 )核心网控制节点将所述路径切换请求中携带的端到端路径质量 Q1与核心网侧路径质量 Q2进行比较， 得到两者差值大于预先设置的路径 质量阈值， 则确定当前会话路径质量恶化是由接入网路径引起的， 核心网 控制节点感知到 UE— A和 /或 UE— B还有其他可用的接入网节点， 决定将 UE A切换到新的接入网节点 A2, 将 UE— B切换到新的接入网节点 B2; 具体地， 核心网控制节点根据 UE— A、 以及 UE— B的接入网信息， 感知 到 UE— A和 /或 UE— B有其他可用的接入网节点 ,则为 UE— A和 /或 UE— B重 选接入网节点。
5905 )核心网控制节点通知 UE— B 更新到接入网节点 B2上进行通信； S906 )核心网控制节点向 UE— A返回路径切换响应， 通知 UE— B 切换 到接入网节点 A2上进行通信；
S907 ) UE A和 UE— B通过与核心网控制节点协商，分别切换到接入网 节点 A2、 接入网节点 B2, 通过接入网节点 A2、 接入网节点 B2继续进行 多媒体通信。
本实施例中， 进行接入点切换时， 可以为 UE— A和 UE— B都重选接入 网节点， 并将 UE— A和 UE— B都切换到重选的接入网节点， 也可以只为其 中 UE— A和 UE— B任意一个重选接入节点并进行切换， 实际应用中， 由核 心网控制节点根据自身收集到的 UE— A和 UE— B的接入网信息决定是否重 选接入网节点、 以及是否切换到重选的接入网节点， 具体过程为现有技术， 本领域技术人员根据本领域常用技术手段， 能够将该现有技术与本发明相 结合， 来实现路径切换。
以上所述， 仅为本发明的较佳实施例而已， 并非用于限定本发明的保 护范围， 凡在本发明的精神和原则之内所作的任何修改、 等同替换和改进 等， 均应包含在本发明的保护范围之内。
Claims
1、 一种路径切换方法， 其特征在于， 所述方法包括：
在接收到当前会话中的网元发起的路径切换请求后， 核心网控制节点 获取当前会话的端到端路径质量、 以及核心网侧路径质量；
所述核心网控制节点根据所获取到的当前会话的端到端路径质量、 与 核心网侧路径质量， 确定当前会话路径的恶化原因；
根据确定的当前会话路径的恶化原因， 所述核心控制节点拒绝所述路 径切换请求， 或为当前会话重建媒体传输路径。
2、 根据权利要求 1所述的路径切换方法， 其特征在于， 所述发起路径 切换请求的网元为： 当前会话路径上的终端设备、 或媒体网关、 或媒体中 继设备。
3、 根据权利要求 1所述的路径切换方法， 其特征在于， 所述核心网控 制节点获取当前会话路径的端到端路径质量， 为：
所述网元获得当前会话的端到端路径质量， 并通过所述路径切换请求 携带给所述核心网控制节点； 或者， 所述核心网控制节点主动向当前会话 的终端设备查询当前会话的端到端路径质量。
4、 根据权利要求 1所述的路径切换方法， 其特征在于， 所述核心网控 制节点获取当前会话的核心网侧路径质量， 为：
核心网控制节点通过向代理节点管理服务器查询当前会话路径上核心 网侧的路径质量。
5、 根据权利要求 1所述的路径切换方法， 其特征在于， 所述核心网控 制节点根据所获取到的当前会话的端到端路径质量、 与核心网侧路径质量， 确定当前会话路径的恶化原因， 为：
所述核心网控制节点将所获取到的当前会话的端到端路径质量与核心 网侧路径质量进行比较， 如果两者的差值符合预设的路径质量阈值要求， 则确定当前会话路径的恶化由核心网侧路径引起； 如果两者的差值不符合 预设的路径质量阈值要求， 则确定当前会话路径的恶化由接入网侧路径 I 起。
6、 根据权利要求 5所述的路径切换方法， 其特征在于， 根据确定的当 前会话路径的恶化原因， 所述核心控制节点拒绝所述路径切换请求， 或为 当前会话重建媒体传输路径， 包括：
在确定当前会话路径的恶化由核心网侧路径引起时， 所述核心网控制 节点为当前会话重选媒体设备， 并通知当前会话上的终端设备切换到重选 的媒体设备上， 为当前会话重建媒体传输路径；
在确定当前会话路径的恶化由接入网侧路径引起时， 所述核心网控制 节点向所述发起路径切换请求的网元发送拒绝消息， 拒绝所述路径切换请 求； 或者， 所述核心网控制节点为当前会话重选接入网节点， 并通知当前 会话路径上的终端设备切换到重选接入网节点上， 为当前会话重建媒体传 输路径。
7、 根据权利要求 6所述的路径切换方法， 其特征在于， 在确定当前会 话路径的恶化由接入网侧路径引起时， 所述核心网控制节点拒绝所述路径 切换请求， 包括：
在以下情况下， 核心网控制节点向所述发起路径切换请求的网元发送 拒绝消息， 拒绝所述路径切换请求： 核心网控制节点未能获取到的当前会 话上两个终端设备的接入网信息； 或者， 核心网控制节点根据已获取到的 当前会话上两个终端设备的接入网信息， 能感知当前会话路径上两个终端 设备都没有其他可用接入网节点； 或者， 所感知到的当前会话路径上两个 终端设备的其他可用接入网节点， 均不被已配置的切换策略所允许。
8、 根据权利要求 6所述的路径切换方法， 其特征在于， 在确定当前会 话路径的恶化由接入网侧路径引起时， 所述核心网控制节点为当前会话重 选接入网节点， 并通知当前会话路径上的终端设备切换到重选接入网节点 上， 为当前会话重建媒体传输路径， 包括：
所述核心网控制节点能够获取到当前会话路径上两个终端设备的接入 网信息， 并且根据所获取到的接入网信息， 能够感到当会话路径上任意一 个终端设备或两个终端设备有其他可用的接入网节点， 则在所感知的其他 可用接入网节点中， 为当前会话重选一个或两个接入网节点， 并通知当前 会话上的终端设备切换到重选的接入网节点上， 为当前会话重建媒体传输 路径。
9、 一种路径切换装置， 其特征在于， 所述装置包括： 获取单元、 确定 单元和动作单元， 其中，
获取单元， 用于在接收到当前会话中的网元发起的路径切换请求后， 获取当前会话的端到端路径质量、 以及核心网侧路径质量；
确定单元， 用于根据所述获取单元获取到的当前会话的端到端路径质 量、 与核心网侧路径质量， 确定当前会话路径的恶化原因；
动作单元， 用于根据所述确定单元确定的当前会话路径的恶化原因， 拒绝所述路径切换请求， 或为当前会话重建媒体传输路径。
10、 根据权利要求 9所述的路径切换装置， 其特征在于， 所述获取单 元包括第一获耳 4莫块和第二获取模块， 其中，
第一获取模块， 用于通过所述发起路径切换请求的网元获得当前会话 的端到端路径质量， 或者通过向当前会话的终端设备查询当前会话的端到 端路径质量；
第二获取模块， 用于通过向代理节点管理服务器查询当前会话路径上 核心网侧的路径质量。
11、 根据权利要求 9所述的路径切换装置， 其特征在于，
所述确定单元用于， 将所述获取单元获取到的当前会话的端到端路径 质量与核心网侧路径质量进行比较， 如果两者的差值符合预设的路径质量 阈值要求， 则确定当前会话路径的恶化由核心网侧路径引起； 如果两者的 差值不符合预设的路径质量阈值要求， 则确定当前会话路径的恶化由接入 网侧路径？ I起； 并将所确定的当前会话路径恶化原因发送给所述动作单元。
12、 根据权利要求 11所述的路径切换装置， 其特征在于， 所述动作单 元用于，
接收所述确定单元发送的当前会话路径恶化原因； 在接收到的当前会 话路径恶化原因为核心网侧路径时， 为当前会话重选媒体设备， 并通知当 前会话上的终端设备切换到重选的媒体设备上， 为当前会话重建媒体传输 路径； 在接收到的当前会话路径恶化原因为接入网侧路径时， 向所述发起 路径切换请求的网元发送拒绝消息， 拒绝所述路径切换请求； 或者， 为当 前会话重选接入网节点， 并通知当前会话路径上的终端设备切换到重选接 入网节点上， 为当前会话重建媒体传输路径。
13、 一种路径切换系统， 其特征在于， 所述系统包括： 终端设备、 接 入网节点、 核心网控制节点和媒体设备， 其中， 核心网控制节点包括： 获 取单元、 确定单元和动作单元， 其中，
获取单元， 用于在接收到当前会话中的网元发起的路径切换请求后， 获取当前会话的端到端路径质量、 以及核心网侧路径质量；
确定单元， 用于根据所述获取单元获取到的当前会话的端到端路径质 量、 与核心网侧路径质量， 确定当前会话路径的恶化原因；
动作单元， 用于根据所述确定单元确定的当前会话路径的恶化原因， 拒绝所述路径切换请求， 或为当前会话重建媒体传输路径。
14、 根据权利要求 13所述的路径切换系统， 其特征在于， 所述系统还 包括： 代理节点管理服务器， 所述核心网控制节点的获取单元通过向该代 理节点管理服务器查询得到当前会话路径上核心网侧的路径质量。
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| CN102469082A (zh) | 2012-05-23 |
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