WO2016091154A1

WO2016091154A1 - Method for determining media capabilities and call control network element

Info

Publication number: WO2016091154A1
Application number: PCT/CN2015/096697
Authority: WO
Inventors: 张立斌
Original assignee: 华为技术有限公司
Priority date: 2014-12-09
Filing date: 2015-12-08
Publication date: 2016-06-16
Also published as: CN104539588B; CN104539588A

Abstract

Disclosed are a method for determining media capabilities and a call control network element. The method according to the embodiments of the present invention comprises: a call control network element receives a call request from a calling side device (101); the call control network element acquires the media transmission state of at least one of the calling side device and a called side device in a call path (102); the call control network element determines, according to the media transmission state, a media capability when a session is established between the calling side device and the called side device (103). The embodiments of the present invention improve the session quality and provide excellent user experience.

Description

Method for determining media capability and call control network element

This application claims priority to Chinese Patent Application No. 201410749242.0, entitled "Method for Determining Media Capabilities and Call Control Network Element", filed on December 09, 2014, the entire contents of which are hereby incorporated by reference. Combined in this application.

Technical field

The present invention relates to the field of communications technologies, and in particular, to a method for determining media capabilities and a call control network element.

Background technique

In the field of communication, such as real-time calls, before the call is established, the calling and the called parties must interact with each other's media capabilities, and then perform media calls after the interaction is completed.

Taking the Session Initiation Protocol (SIP) call as an example, the media capabilities of the session are interacted by the Session Description Protocol (SDP). The basic flow of a typical basic call model (taking audio as an example) is as follows: The calling side device initiates a session request, and the media capability supported by the calling side device is the audio codec AMR-WB. The call request of the calling side device is forwarded to the call control network element, and the call control network element forwards the call request to the called side device. The called side device receives the call request, and the called side device supports the AMR-WB, and the called side device supports the call, and responds to the calling side device with a response message, and the message carries the AMR-WB codec capability. 4 The call control network receives the called side device response message and forwards the message to the calling side device. 5 The calling side device receives the media capability in the called response message, and the media information between the calling and the called party is completed, and the media information on both sides can be realized by using the interactive media information.

Generally speaking, in order to achieve as much media intercommunication as possible, the originating caller can carry multiple media capabilities, that is, all the media capabilities supported by the caller can be placed in the call request, such as voice and video, and voice and video. It can also carry a variety of media encoding and decoding capabilities. After receiving the media capability declared by the calling side device, the called side device can select the media capability to be used for the session based on its own supported capabilities and preferences (such as configuration), and then give the main The side device is called to answer, so that the mediation between the main and the called parties is completed, and the session can be based on the media capability.

In the prior art, if there are multiple media capabilities in the call request, then according to the standard, which media capability is in the order of the SDP, which function is preferred during the session, which session is used? Media capabilities. Since the media capability sequence carried by the session initiator is fixed, the media capability selected by the called side device may not be suitable for the current session environment, which means that the quality of the session cannot achieve the expected effect even if the called side device does not The preferred media codec in the call request is preferred, and the selected media capability (media codec) may still not match the current session environment, resulting in the session quality being less than expected and the user experience being poor.

Summary of the invention

The embodiment of the invention provides a method for determining media capabilities and a call control network element, which improves session quality and has a good user experience.

A first aspect of the embodiments of the present invention provides a method for determining media capabilities, including:

The call control network element receives the call request of the calling side device;

The call control network element acquires a media transmission status of at least one of the calling side device and the called side device on the call path;

The call control network element determines, according to the media transmission status, a media capability when establishing a session between the calling side device and the called side device.

With reference to the first aspect of the embodiments of the present invention, in a first implementation manner of the first aspect of the embodiments, the call request includes a media capability supported by the calling side device;

The determining, by the call control network element, the media capability when establishing a session between the calling side device and the called side device according to the media transmission status includes:

The call control network element selects a preferred media capability that matches the media transmission state according to the media transmission status;

The call control network element updates the media capability supported by the calling side device in the call request to the preferred media capability;

The call control network element forwards a call request after updating the media capability to the called side device;

Receiving, by the call control network element, a call response returned by the called side device, where the call response carries a session media capability selected by the called side device according to the preferred media capability;

The call control network element sends a response to the calling side device.

In conjunction with the first implementation of the first aspect of the embodiments of the present invention, in the embodiment of the present invention In a second implementation manner of the first aspect, the obtaining, by the call control network element, the media transmission status of the at least one of the calling side device and the called side device on the call path includes:

The call control network element acquires a media transmission status of one of the calling side device and the called side device on the call path;

The selecting, by the call control network element, the preferred media capabilities that match the media transmission status according to the media transmission status includes:

The call control network element selects a preferred media capability that matches the media transmission state according to a media transmission status of the one of the ones on the call path;

The call control network element sends a response to the calling side device, including:

The call control network element sends the response to the calling side device, where the response carries the session media capability.

With reference to the second implementation manner of the first aspect of the embodiment of the present invention, in a third implementation manner of the first aspect of the embodiment, the media transmission state of the one of the call paths includes the One of the signal states of the wireless air interface;

Determining, by the call control network element, whether the signal state satisfies a preset signal state condition, and if yes, selecting a media capability supported by the calling side device as the preferred media capability, and if not, at the calling Among the media capabilities supported by the side devices, the media capability that occupies a low bandwidth is selected as the preferred media capability.

With reference to the third implementation manner of the first aspect of the embodiment of the present invention, in the fourth implementation manner of the first aspect of the embodiment of the present disclosure, the selecting the media capability that is low in bandwidth to the preferred media capability includes:

The video media capability is filtered when the media capabilities supported by the calling side device include audio media capabilities and video media capabilities.

With reference to the third implementation manner or the fourth implementation manner of the first aspect of the embodiments of the present invention, in a fifth implementation manner of the first aspect of the embodiments of the present disclosure, the Selecting media capabilities that occupy low bandwidth from the media capabilities for the preferred media capabilities include:

When the media capability supported by the calling side device includes media capabilities of multiple types of media encoding and decoding, according to a preset relationship between a preset signal state and a media capability, the calling side device Among the supported media capabilities, the media capabilities that match the signal state are adjusted to the preferred one.

or,

When the media capability supported by the calling side device includes media capabilities of multiple types of media encoding and decoding, according to the corresponding relationship between the preset signal state and the media capability, in the media capability supported by the calling side device, Media capability filtering that does not match the signal state,

or,

When the media capabilities supported by the calling side device include multiple rate sets of the same type of media codec, according to the corresponding relationship between the preset signal state and the rate mode, among the media capabilities supported by the calling side device, A set of rate patterns is selected that match the state of the signal, the set of rate patterns including at least one rate pattern.

With reference to the second implementation manner of the first aspect of the embodiment of the present invention, in a sixth implementation manner of the first aspect of the embodiment, the media transmission state of the one of the call paths includes the One of the access methods;

The selecting, by the call control network element, the preferred media capability that matches the media transmission status of the calling side device on the call path according to the media transmission status of the calling side device on the call path includes:

The anti-dropping media capability of the call control network element when the access mode of the one of the access modes is a Wi-Fi access mode, and the calling side device supports the anti-drop packet media capability Select preferred media capabilities.

With reference to the first implementation manner of the first aspect of the embodiments of the present invention, in a seventh implementation manner of the first aspect of the embodiment, the call control network element obtains the calling side device and the called side device. At least one of the media transmission statuses on the call path includes:

The call control network element acquires a media transmission status of the calling side device and the called side device on a call path;

The call control network element selects a preferred media capability that matches the media transmission state of the called side device on the call path according to the media transmission status of the called side device on the call path;

The method further includes:

Selecting, by the call control network element, a preferred media capability that matches a media transmission state of the calling side device on a call path according to a media transmission state of the calling side device on a call path;

The call control network element sends the response to the calling side device, where the response carries a preferred media capability that matches the media transmission status of the calling side device on the call path.

With reference to the seventh implementation manner of the first aspect of the embodiments of the present invention, in the eighth implementation manner of the first aspect of the embodiments, the call control network element acquires the calling side device and the The media transmission status of the calling device on the call path includes:

The call control network element acquires network transmission quality of the calling side device and the called side device on a call path;

The selecting, by the call control network element, the preferred media capability that matches the media transmission state of the called side device on the call path according to the media transmission status of the called side device on the call path includes:

The call control network element determines whether the network transmission quality of the called side device on the call path meets a preset network transmission quality condition, and if yes, selects the media capability supported by the calling side device as the preferred medium. Capability, if not, selecting a preferred media capability that matches the network transmission quality of the called side device on the call path among the media capabilities supported by the calling side device;

The call control network element determines whether the network transmission quality of the calling side device on the call path meets a preset network transmission quality condition, and if yes, selects the media capability supported by the calling side device as the preferred media. The capability, if not, selects a preferred media capability that matches the network transmission quality of the calling side device on the call path among the media capabilities supported by the calling side device.

With reference to the seventh implementation manner of the first aspect of the embodiments of the present invention, in a ninth implementation manner of the first aspect of the embodiments, the call control network element acquires the calling side device and the The media transmission status of the calling device on the call path includes:

The call control network element acquires an access mode of the calling side device and the called side device;

When the access control mode of the call control network element is a Wi-Fi access mode, and the calling side device supports the anti-drop packet media capability, the anti-drop packet media Selecting preferred media capabilities among capabilities;

When the access control mode of the calling control device is a Wi-Fi access mode, and the calling side device supports the anti-drop packet media capability, the anti-drop packet media The preferred media capabilities are selected among the capabilities.

A second aspect of the embodiments of the present invention provides a call control network element, including:

a receiving unit, configured to receive a call request of the calling side device;

a processing unit, configured to acquire a media transmission status of at least one of the calling side device and the called side device on the call path;

The processing unit is further configured to determine, according to the acquired media transmission status, a media capability when establishing a session between the calling side device and the called side device.

With reference to the second aspect of the embodiments of the present invention, in a first implementation manner of the second aspect of the embodiments, the processing unit is further configured to:

When the media capability supported by the calling side device is included in the call request, selecting a preferred media capability that matches the media transmission state according to the media transmission state;

Updating the media capability supported by the calling side device in the call request to the preferred media capability;

The call control network element further includes:

a sending unit, configured to forward, to the called side device, a call request after updating the media capability;

The receiving unit is further configured to receive a call response returned by the called side device, where the call response carries a session media capability selected by the called side device according to the preferred media capability;

The sending unit is further configured to send a response to the calling side device.

With reference to the first implementation manner of the second aspect of the embodiment of the present invention, in the second implementation manner of the second aspect of the embodiment, the processing unit is specifically configured to:

Obtaining a media transmission status of one of the calling side device and the called side device on the call path;

Selecting a preferred media capability that matches the media transmission state according to a media transmission status of one of the ones on the call path;

The sending unit is specifically configured to send the response to the calling side device, where the response carries the session media capability.

With reference to the second implementation manner of the second aspect of the embodiment of the present invention, in a third implementation manner of the second aspect of the embodiment, the processing unit is specifically configured to use one of the ones on the call path. When the media transmission state includes the signal state of the wireless air interface, the signal state is determined to satisfy the preset signal state condition, and if yes, the media capability supported by the calling side device is selected as the preferred The media capability, if not, selects a media capability that occupies a low bandwidth as the preferred media capability among the media capabilities supported by the calling side device.

With reference to the third implementation manner of the second aspect of the embodiment of the present invention, in a fourth implementation manner of the second aspect of the embodiment, the processing unit is specifically configured to be used by the media supported by the calling side device. The video media capabilities are filtered when the capabilities include audio media capabilities and video media capabilities.

With reference to the third implementation manner or the fourth implementation manner of the second aspect of the embodiment of the present invention, in a fifth implementation manner of the second aspect of the embodiment, the processing unit is specifically configured to:

When the media capability supported by the calling side device includes media capabilities of multiple types of media encoding and decoding, according to the corresponding relationship between the preset signal state and the media capability, in the media capability supported by the calling side device, The media capabilities that match the signal state are adjusted to preferred,

or,

With reference to the second implementation manner of the second aspect of the embodiment of the present invention, in a sixth implementation manner of the second aspect of the embodiment, the processing unit is specifically configured to: when one of the ones is on a call path The media transmission state includes one of the access modes, and when the access mode of the one of the access modes is a Wi-Fi access mode, and the calling side device supports the anti-dropping media capability, Selecting a preferred media capability among the anti-lost media capabilities.

With reference to the first implementation manner of the second aspect of the embodiment of the present invention, in a seventh implementation manner of the second aspect of the embodiment, the processing unit is specifically configured to:

Obtaining a media transmission status of the calling side device and the called side device on a call path;

Determining, according to the media transmission status of the called side device on the call path, a preferred media capability that matches the media transmission status of the called side device on the call path;

The processing unit is further configured to select, according to a media transmission status of the calling side device on a call path, a preferred media capability that matches a media transmission state of the calling side device on a call path;

The sending unit is specifically configured to send the response to the calling side device, where the response carries a preferred media capability that matches the media transmission status of the calling side device on the call path.

With reference to the seventh implementation manner of the second aspect of the embodiment of the present invention, in the eighth implementation manner of the second aspect of the embodiment, the processing unit is specifically configured to:

Obtaining network transmission quality of the calling side device and the called side device on a call path;

Determining whether the network transmission quality of the called side device on the call path meets a preset network transmission quality condition, and if yes, selecting the media capability supported by the calling side device as the preferred media capability, and if not, Selecting, among the media capabilities supported by the calling side device, a preferred media capability that matches the network transmission quality of the called side device on the call path;

The processing unit is further configured to determine whether the network transmission quality of the calling side device on the call path meets a preset network transmission quality condition, and if yes, select the media capability supported by the calling side device to be the Preferably, the media capability, if not, selects a preferred media capability that matches the network transmission quality of the calling side device on the call path among the media capabilities supported by the calling side device.

With reference to the eighth implementation manner of the second aspect of the embodiment of the present invention, in the ninth implementation manner of the second aspect of the embodiment, the processing unit is specifically configured to:

Obtaining an access mode of the calling side device and the called side device;

Selecting a preferred media capability among the anti-dropping media capabilities when the access mode of the called device is a Wi-Fi access mode, and the calling device supports the anti-dropping media capability. ;

The processing unit is further configured to: when the access mode of the calling side device is a Wi-Fi access mode, and the calling side device supports the anti-drop packet media capability, the anti-drop packet The preferred media capabilities are selected among the media capabilities.

A third aspect of the embodiments of the present invention provides a call control network element, including:

a receiver, configured to receive a call request of the calling side device;

a processor, configured to acquire a media transmission status of at least one of the calling side device and the called side device on the call path;

The processor is further configured to determine, according to the media transmission status, a media capability when establishing a session between the calling side device and the called side device.

It can be seen from the above technical solutions that the embodiments of the present invention have the following advantages:

In the embodiment of the present invention, the call control network element determines that the calling side device and the called side device are established according to the acquired media transmission state of the calling side device and the called side device in the call path. The media capability during the session is improved according to the media transmission status of the selected session media capability, and matches the media transmission status of the current session, thereby improving the session quality and the user experience.

DRAWINGS

1 is a schematic diagram of an embodiment of a method for determining media capabilities in an embodiment of the present invention;

2 is a schematic diagram of another embodiment of a method for determining media capabilities in an embodiment of the present invention;

3 is a schematic diagram of another embodiment of a method for determining media capabilities in an embodiment of the present invention;

4 is a schematic diagram of another embodiment of a method for determining media capabilities in an embodiment of the present invention;

FIG. 5 is a schematic diagram of another embodiment of a method for determining media capabilities in an embodiment of the present invention; FIG.

6 is a schematic diagram of an embodiment of a call control network element in an embodiment of the present invention;

FIG. 7 is a schematic diagram of another embodiment of a call control network element in an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is an embodiment of the invention, but not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of the present invention.

The terms "first", "second", and the like (if any) in the specification and claims of the present invention and the above figures are used to distinguish similar objects, and are not necessarily used to describe a particular order or order. It is to be understood that the data so used may be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than what is illustrated or described herein. In addition, the terms "comprises" and "comprises" and "the" and "the" are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or device that comprises a series of steps or units is not necessarily limited to Those steps or units may include other steps or units not explicitly listed or inherent to such processes, methods, products or devices.

The various techniques described herein can be used in a variety of communication systems, including 2G, 3G communication systems, and next generation communication systems, such as 2G communication systems such as Global System for Mobile Communications (GSM), Wideband Code Division Multiple Access ( Longband evolution (CDMA), 3D communication systems such as time division synchronization code division multiple access (TD-SCDMA), long-term evolution (LTE), and its subsequent evolution Next generation communication systems such as systems.

The calling side device and the called side device described in the embodiment of the present invention may be applied to the foregoing The communication device in the information system, such as the communication terminal, may specifically be a mobile phone or a computer with a mobile terminal, for example, a portable, pocket, handheld, computer built-in or vehicle-mounted mobile device, etc. There is no limit.

The media capability described in the embodiment of the present invention is a coding mode (or transmission mode) for exchanging media content or data content between two communication parties (such as a calling side device and a called side device), such as audio media capability and video media capability. , pictures, faxes, etc.

Referring to FIG. 1, an embodiment of a method for determining media capabilities in an embodiment of the present invention includes:

101. The call control network element receives a call request of the calling side device.

In the field of communication, such as real-time calling, before the session is established, the calling and the called parties must interact with each other's media capabilities, determine the media capabilities during the session, and perform media sessions after the interaction is completed.

In this embodiment, before the session is established, the calling side device sends a call request to the call control network element.

102. The call control network element acquires a media transmission status of at least one of the calling side device and the called side device on the call path.

The media transmission state of the calling side device and the called side device on the call path may be the signal state of the wireless air interface where the calling side device and the called side device are located, and the transmission bandwidth that can be supported can be known according to the signal state of the wireless air interface;

The media transmission status of the calling side device and the called side device on the call path may also be the network transmission quality of the calling side device and the called side device on the call path, and the call control network element may be connected to many networks. It is also possible to connect many devices, but no matter how the docking is based on the IP address, the call control network element can perform real-time statistics on the network transmission quality of each IP address pair based on the IP address pair mode. The statistics may be statistics of existing services of all users or partial sampled users of each address pair, and the IP address pair is a call path between two device IP addresses, and the call control network element may acquire before the session is established. The statistical network transmission quality of the calling side device and the called side device on the call path (IP address pair). The network transmission quality may include a packet loss rate, a delay, a jitter, and a MOS value, which are not limited herein.

In an actual application, the media transmission status of the calling side device and the called side device on the call path may also be the access mode of the calling side device and the called side device, such as Wi-Fi access mode and LTE access. Ways, etc.

In this embodiment, the call control network element may only obtain the media transmission status of the calling side device on the call path, or may only obtain the media transmission status of the called side device on the call path, and may also acquire the calling side device at the same time. The media transmission status of the called device on the call path is not limited herein.

103. The call control network element determines, according to the media transmission status, a media capability when establishing a session between the calling side device and the called side device;

In this embodiment, the call control network element determines the calling side device and the device according to the obtained media transmission state (the media state of at least one of the calling side device and the called side device on the call path) The media capability when establishing a session between the called side devices, for example, when acquiring the signal state of the wireless air interface of the calling side device, the transmission bandwidth that can be supported can be known according to the signal state of the wireless air interface, and the calling side device supports Among the media capabilities, the media capability can be prioritized or directly selected to occupy a bandwidth that does not exceed the bandwidth that the signal state can support.

If there are multiple media capabilities in the call request, then according to the standard, which media capability is in the SDP order, which capacity is preferred during the session, which media capability is used for the session. Since the media capability sequence carried by the session initiator is fixed, the media capability selected by the called side device may not be suitable for the current session environment, which means that the quality of the session cannot achieve the expected effect even if the called side device does not The preferred media codec in the call request is preferred, and the selected media capability (media codec) may still not match the current session environment, resulting in the session quality being less than expected and the user experience being poor.

In this embodiment, after receiving the call request of the calling side device, the call control network element determines the calling side device according to the obtained media transmission state of the calling side device and the called side device in the call path. The media capability when the session is established between the called devices is improved according to the media transmission state, and the media transmission state of the current session is matched, which improves the session quality and the user experience is good.

Referring to FIG. 2, another embodiment of a method for determining media capabilities in an embodiment of the present invention includes:

201. The call control network element receives a call request of the calling side device.

Generally speaking, in order to achieve as much media intercommunication as possible, the originating caller can carry multiple media capabilities, that is, all the media capabilities supported by the caller can be placed in the call request, such as voice and video, and voice and video. Can also carry a variety of media encoding and decoding capabilities, like The audio media capabilities include AMR and AMR-WB, or audio media capabilities including media codec for G.711 codec, G.729 codec, and iLBC codec. The caller device will call before the session is established. The control network element sends a call request, where the call request includes the media capability supported by the calling side device.

202. The call control network element acquires a media transmission status of at least one of the calling side device and the called side device on the call path.

The media transmission status may be different under different media bearer modes. For example, in the LTE access mode, there is a minimum bandwidth guarantee, that is, GBR (Guranteed Bit Rate) guarantee, but in the Wi-Fi access mode, all connections are made. The bandwidth of the user equipment entering the Wi-Fi node is preemptive. Therefore, if it is a Wi-Fi access mode, it means that the packet loss or delay and jitter value of the media transmission path of the user equipment is large. In this case, the media capability of the anti-drop packet should be selected. Therefore, the media transmission status of the calling side device and the called side device on the call path may also be the access mode of the calling side device or the called side device, such as Wi- Fi access mode, LTE access mode, and the like.

203. The call control network element selects a preferred media capability that matches the media transmission status.

When the media transmission status of the calling side device on the call path is obtained in step 202, the preferred media capability matching the media transmission status of the calling side device on the call path is selected, and the step 202 is obtained. When the called side device is in the media transmission state on the call path, the preferred media capability matching the media transmission state of the called side device on the call path is selected, and in step 202, the calling side device and the called side are simultaneously acquired. When the device is in the media transmission state on the call path, the preferred media capability that matches the media transmission state of the called device on the call path is selected.

The preferred media capability is selected according to the acquired media transmission status, and may include one or more media capabilities supported by the calling side device, for example, when the media capabilities supported by the calling side device are AMR and AMR-WB. When AMR-WB is a wideband speech codec, the coding rate is high, and the required transmission bandwidth is large, AMR is a narrowband speech codec, the coding rate is low, and the required transmission bandwidth is small, when the acquired calling side device is When the wireless air interface signal status is insufficient to support the AMR-WB audio media capability, the AMR audio media capability can be selected as the preferred media capability.

204. The call control network element updates the media capability supported by the calling side device in the call request to a preferred media capability.

The call control network element adjusts the media capability supported by the calling side device in the received call request to the determined preferred media capability, for example, the media capability supported by the calling side device is AMR and AMR-WB audio media capability, according to The preferred media capability determined by the acquired media transmission status is the AMR audio media capability, and the media capability in the call request is adjusted to the AMR audio media capability.

205. The call control network element forwards the call request after updating the media capability to the called side device.

After updating the media capability in the call request, the call control network element forwards the call request after updating the media capability to the called side device, so that the called side device according to the updated media capability The preferred media capability in the subsequent call request selects the session media capability and returns a call response to the call control network element, the call response carrying the session media capability selected by the called side device according to the preferred media capability;

In this embodiment, the session media capability is a media capability, such as AMR, when the called side device selects a session with the calling side device according to the preferred media capability, and the subsequent called side device can directly establish a session based on the media capability.

206. The call control network element sends a response to the calling side device.

After receiving the call response returned by the called side device, the call control network element sends a response to the calling side device. In step 202, the call control network element obtains one of the calling side device and the called side device in the call path. In the medium transmission state, the calling side device also uses the session media capability determined by the called side device, and the response may carry the session media capability determined by the called side device;

When the call control network element obtains the media transmission status of the calling side device and the called side device on the call path, when the calling side device can use the media capability determined by itself as the media capability during the session, The response may carry the preferred media capability that matches the media transmission status of the calling side device on the call path, which is not limited herein, so that the call control network element completes the calling side device and the called side. The device media capability is selected, and the session can be based on the media capabilities selected by the calling side device and the called side device.

In the embodiment of the present invention, after receiving the call request of the calling side device, the call control network element determines a preferred media according to the media transmission status of the at least one of the obtained calling side device and the called side device on the call path. The capability is such that the called side device selects a session media capability from the preferred media capabilities, and since the selected session media capability is selected from the preferred media capabilities determined by the media transmission state, the media transmission state of the current session is matched, and the capability is improved. The quality of the session is good and the user experience is good.

In the embodiment shown in FIG. 2, the call control network element obtains the media transmission status of at least one of the calling side device and the called side device on the call path, and includes multiple implementation manners, which are described in detail below in conjunction with specific embodiments:

1. The call control network element obtains a media transmission status of one of the calling side device and the called side device on the call path;

Referring to FIG. 3, another embodiment of a method for determining media capabilities in an embodiment of the present invention includes include:

301. The call control network element receives a call request of the calling side device.

Generally speaking, in order to achieve as much media intercommunication as possible, the originating caller can carry multiple media capabilities, that is, all the media capabilities supported by the caller can be placed in the call request, such as voice and video, and voice and video. Can also carry a variety of media encoding and decoding capabilities, such as including audio media capabilities AMR and AMR-WB, or both media codec for G.711 codec, G.729 codec, iLBC codec audio media capabilities, in Before the session is established, the calling side device sends a call request to the call control network element, where the call request includes the media capability supported by the calling side device.

302. The call control network element acquires a media transmission status of one of the calling side device and the called side device on the call path.

In this embodiment, the call control network element obtains the media transmission status of one of the calling side device and the called side device on the call path. In an actual application, the calling side device and the called side device may also be acquired. One of the media transmission states on the call path is not limited herein.

In the VOLTE scenario, the media transmission state of one of the calling side device and the called side device on the call path may be a signal state of the wireless air interface where one of the calling side device and the called side device is located, according to the wireless air interface. The signal state can know the transmission bandwidth that can be supported;

The media transmission status may be different under different media bearer modes. For example, in the LTE access mode, there is a minimum bandwidth guarantee, that is, GBR (Guranteed Bit Rate) guarantee, but in the Wi-Fi access mode, all connections are made. The bandwidth of the user equipment entering the Wi-Fi node is preempted. If the Wi-Fi access mode is used, it means that the packet loss or delay and jitter value of the media transmission path of the user equipment will be large. In this case, the media capability against packet loss should be selected. Therefore, the main The media transmission status of the calling device and the called device on the call path may also be the access mode of the calling device or the called device, such as the Wi-Fi access mode and the LTE access mode.

In this embodiment, the call control network element may only obtain the media transmission status of the calling side device on the call path, or may only obtain the media transmission status of the called side device on the call path, which is not limited herein.

303. The call control network element selects a preferred media capability that matches the media transmission state according to a media transmission status of the one of the ones on the call path.

When the media transmission status of one of the call paths in the step 302 includes the signal status of the wireless air interface, the call control network element is in accordance with the media transmission status of the one of the call paths. Selecting preferred media capabilities that match the media transmission status may include:

The call control network element determines whether the signal state satisfies a preset signal state condition, and if yes, selects a media capability supported by the calling side device as the preferred media capability, and if not, at the calling side device Among the supported media capabilities, selecting a media capability that occupies a low bandwidth is the preferred media capability;

When the signal state of the wireless air interface where the calling device is located is obtained in step 302, the preferred media capability that matches the signal state of the wireless air interface where the calling device is located is selected, and the called device is obtained in step 302. When the signal status of the wireless air interface is located, the preferred media capability matching the signal state of the wireless air interface where the called side device is located is selected.

The call control network element determines whether the signal state satisfies a preset signal state condition. When the acquired signal state condition satisfies the preset signal state condition, indicating that the air interface signal state is good, the media capability of the session may not be controlled. The media capability supported by the calling side device is used as the preferred media capability. When the acquired signal state condition does not meet the preset signal state condition, it means that the air interface signal state is poor, the air interface may have a higher bit error rate, and the probability of air interface retransmission is higher. Large, need to choose the media capacity that occupies low bandwidth as the preferred media capability.

For example, when the media capabilities supported by the calling side device are AMR and AMR-WB, since the AMR-WB is a wideband speech codec, the encoding rate is high, and the required transmission bandwidth is large, the AMR is a narrowband speech codec, and the encoding rate. Low, the required transmission bandwidth is small when acquired When the wireless air interface signal status of the calling side device is known, the transmission bandwidth supported by the wireless air interface signal state of the calling side device, that is, the transmission rate that can be supported, is known, and each type of codec has a requirement for the transmission bandwidth. For example, when the transmission bandwidth supported by the wireless air interface signal state of the calling side device is insufficient to support the audio media capability of the AMR-WB, the audio media capability of the AMR can be selected.

When the acquired signal state does not satisfy the preset signal state condition, the media capability supported by the calling side device is selected as the preferred media capability, which may be one or more of the following: Method to realize:

(1) When the audio media capability and the video media capability are included in the media capabilities supported by the calling side device, the video media capabilities are filtered.

For example, the SDP parameters in the call request are as follows:

m=audio xxxxxx RTP/AVP 97

a=rtpmap:97 AMR/8000

a=ptime:20

m=video 49154 RTP/AVP 99

b=AS:315

a=rtpmap:99 H264/90000

a=fmtp:99 packetization-mode=0;profile-level-id=42e00c;\

Sprop-parameter-sets=J0LgDJWgUH6Af1A=, KM46gA==

The “m=video” at the beginning of the video media capability indicates that the m-line port of the video media capability is set to 0 in the SDP parameter, indicating that the session does not use the video media capability and does not perform video media transmission.

The adjusted SDP parameters are as follows:

m=audio xxxxxx RTP/AVP 97

a=rtpmap:97 AMR/8000

a=ptime:20

m=video 0 RTP/AVP 99

b=AS:315

a=rtpmap:99 H264/90000

a=fmtp:99 packetization-mode=0;profile-level-id=42e00c;\

Sprop-parameter-sets=J0LgDJWgUH6Af1A=, KM46gA==

(2) When the media capability supported by the calling side device includes media capabilities of multiple types of media encoding and decoding, according to the corresponding relationship between the preset signal state and the media capability, the media capability supported by the calling side device Medium, adjusting the media capability matching the signal state to a preferred one;

For example, suppose the SDP parameters received in a call request are as follows:

m=audio xxxxxx RTP/AVP 96 97

a=rtpmap:96 AMR-WB/16000

a=rtpmap:97 AMR/8000

a=ptime:20

It is assumed that the acquired signal state can only match the AMR audio codec (PT value 97). In this case, the order of the PT values in the m rows can be adjusted to indicate that the priority of the media codec changes, as follows:

m=audio xxxxxx RTP/AVP 97 96

a=rtpmap:96 AMR-WB/16000

a=rtpmap:97 AMR/8000

a=ptime:20

In this case, the order of the PT values in the m rows can be adjusted to indicate that the priority of the media codec changes, or the order in the a row can be adjusted at the same time, as follows:

m=audio xxxxxx RTP/AVP 97 96

a=rtpmap:97 AMR/8000

a=rtpmap:96 AMR-WB/16000

a=ptime:20

(3) When the media capability supported by the calling side device includes media capabilities of multiple types of media encoding and decoding, according to the corresponding relationship between the preset signal state and the media capability, the media capability supported by the calling side device Medium, filtering media capabilities that do not match the signal state;

For example, the SDP parameters in the received call request are as follows:

m=audio xxxxxx RTP/AVP 96 97

a=rtpmap:96 AMR-WB/16000

a=rtpmap:97 AMR/8000

a=ptime:20

It is assumed that the acquired signal state can only match the AMR audio codec (PT value 97). In this case, only the AMR-WB audio codec with the PT value of 96 can be filtered out, leaving only the supported AMR media capabilities and adjusting the SDP parameters. as follows:

m=audio xxxxxx RTP/AVP 97

a=rtpmap:97 AMR/8000

a=ptime:20

(4) When the media capability supported by the calling side device includes multiple rate sets of the same type of media codec, according to the corresponding relationship between the preset signal state and the rate mode, the media supported by the calling side device In the capability, a set of rate patterns matching the signal state is selected, and the rate pattern set includes at least one rate mode.

For example, the SDP parameters in the received call request are as follows:

m=audio xxxxxx RTP/AVP 96 97

a=rtpmap:96 AMR/8000

a=fmtp:96 mode-set=0,2,4,7

a=rtpmap:97 AMR/8000

a=fmtp:97 mode-set=0,1,2

a=ptime:20

The mode-set parameter indicates the rate set to be used by the codec. The AMR-WB and the AMR are both multi-rate codecs. The AMR is used as an example. The correspondence between the rate mode and the corresponding rate value is as follows:

Table 1

模式mode	速率rate
00	4.75kbps4.75kbps
11	5.15kbps5.15kbps
22	5.90kbp5.90kbp
33	6.70kbps6.70kbps
44	7.40kbps7.40kbps
55	7.95kbps7.95kbps
66	10.2kbps10.2kbps

77	12.2kbps12.2kbps

The above rate corresponds to the media transmission bandwidth, and the larger the rate, the larger the codec transmission bandwidth.

Therefore, when the quality of the user media transmission path is not good, if the codec has multiple rate sets to select, a low bandwidth rate set can be selected.

Determining, according to the obtained signal state, a corresponding transmission bandwidth that can be supported, and determining a mode supporting the corresponding rate, and assuming that the rate mode is 0, 1, and 2, according to the acquired signal state, Adjust the received SDP parameters as follows:

m=audio xxxxxx RTP/AVP 97

a=rtpmap:97 AMR/8000

a=fmtp:97 mode-set=0,1,2

a=ptime:20

A set of rate modes that can be supported is retained, and a set of rate patterns that do not match the signal state are filtered.

The medium transmission status of the one of the foregoing may also include an access mode of the one of the ones, such as a Wi-Fi access mode, an LTE access mode, and the like.

At this time, the preferred media capability that the call control network element selects to match the media transmission state of the calling side device on the call path according to the media transmission status of the calling side device on the call path includes:

The media transmission status may be different under different media bearer modes. For example, in the LTE access mode, there is a minimum bandwidth guarantee, that is, GBR (Guranteed Bit Rate) guarantee, but in the Wi-Fi access mode, all connections are made. The bandwidth of the user equipment entering the Wi-Fi node is preemptive. Therefore, if it is a Wi-Fi access mode, it means that the packet loss or delay and jitter value of the media transmission path of the user equipment is large. At this time, you should choose the media capability against packet loss, such as selecting iLBC codec or redundant transmission.

In this embodiment, selecting a preferred media capability among the anti-lost media capabilities may be:

(1) When the media capability supported by the calling side device includes media capabilities of multiple types of media encoding and decoding, in the media capabilities supported by the calling side device, the anti-dropping media capability is adjusted. To the preferred, if the access mode has a high packet loss rate, the media capability of the anti-lost iLBC codec is adjusted to the preferred one.

(2) When the media capability supported by the calling device includes media capabilities of multiple types of media encoding and decoding, media capabilities that are not resistant to packet loss are filtered in the media capabilities supported by the calling device.

304. The call control network element updates the media capability supported by the calling side device in the call request to a preferred media capability.

305. The call control network element forwards the call request after updating the media capability to the called side device.

After updating the media capability in the call request, the call control network element forwards the call request after updating the media capability to the called side device, so that the called side device according to the preferred media in the call request after updating the media capability The capability selects the session media capability and returns a call response to the call control network element, the call response carrying the session media capability selected by the called side device according to the preferred media capability;

306. The call control network element sends the response to the calling side device.

In this embodiment, after receiving the call response returned by the called side device, the call control network element sends a response to the calling side device. In step 302, the call control network element obtains the calling side device and the called side device. a media transmission state on the call path, the calling side device also uses the session media capability determined by the called side device, and the response may carry the session media capability determined by the called side device;

In a practical application, when the call control network element acquires the media transmission status of the calling side device and the called side device on the call path, the calling side device may use the media determined by itself. When the capability is used as the media capability of the session, the response may carry the preferred media capability of the media transmission state of the calling device on the call path, which is not limited, so that the call control network element The session capability of the calling side device and the called side device is completed, and the session can be performed based on the media capabilities selected by the calling side device and the called side device, which are not limited herein.

2. The call control network element acquires the network transmission quality of the calling side device and the called side device on the call path.

Referring to FIG. 4, another embodiment of a method for determining media capabilities in an embodiment of the present invention includes:

401. The call control network element receives a call request of the calling side device.

402. The call control network element acquires a media transmission status of the calling side device and the called side device on the call path.

In this embodiment, the call control network element obtains the media transmission status of the calling side device and the called side device on the call path as an example. In an actual application, the call control network element may only obtain the calling path of the calling side device. The state of the media transmission on the device can also be used to obtain only the media transmission status of the called device on the call path, which is not limited herein.

In the VOLTE scenario, the media transmission status of the calling side device and the called side device on the call path may be the signal state of the wireless air interface where the calling side device and the called side device are located, and can be known according to the signal state of the wireless air interface. Transmission bandwidth

In this embodiment, the media transmission status of the calling side device and the called side device on the call path is also the network transmission quality of the calling side device and the called side device on the call path, and the call control network element can be docked. Many networks can also connect many devices, but no matter how the docking is based on IP addresses, the call control network element can be based on the IP address. Perform real-time statistics on the network transmission quality of each IP address pair. The statistics may be statistics on the existing services of all users or partial sample users of each address pair. The IP address pair is two device IPs. The call path between the addresses, before the session is established, the call control network element can obtain the statistical network transmission quality of the calling side device and the called side device on the call path (IP address pair). The network transmission quality may include a packet loss rate, a delay, a jitter, and a MOS value, which are not limited herein.

403. The call control network element selects a preferred media capability that matches the media transmission status of the calling side device and the called side device on the call path according to the media transmission status of the calling side device and the called side device on the call path. ;

In this embodiment, the call control network element selects a media transmission state matching the calling side device and the called side device on the call path according to the media transmission status of the calling side device and the called side device on the call path. Preferred media capabilities can include:

The call control network element determines whether the network transmission quality of the calling side device and the called side device on the call path meets a preset network transmission quality condition, and if so, selects the media capability supported by the calling side device as a location Determining a preferred media capability, if not, selecting a preferred media capability that matches the network transmission quality of the calling side device and the called side device on the call path among the media capabilities supported by the calling side device;

As shown in Table 2 below, the preferred media capability can be selected according to the network packet quality indicator such as the packet loss rate value, the time length, the jitter value, and the MOS value, or a combination of one or more of the above network transmission quality indicators. This is not limited here.

Table 2

In this embodiment, the preferred media capabilities that the call control network element selects to match the network transmission quality of the calling side device and the called side device on the call path include:

When the network transmission quality includes a packet loss rate, the call control network element determines whether the packet loss rate value is less than a preset packet loss rate value, and if yes, selects a media capability supported by the calling side device as And the preferred media capability, if not, selecting a preferred media capability that matches the packet loss rate value among the media capabilities supported by the calling side device;

or,

When the network transmission quality includes a delay value, the call control network element determines whether the delay value is less than a preset delay value, and if yes, selecting a media capability supported by the calling side device as the Optimizing the media capability, if not, selecting a preferred media capability that matches the delay value among the media capabilities supported by the calling side device;

or,

When the network transmission quality includes a jitter value, the call control network element determines whether the jitter value is less than a preset first threshold, and if yes, selects a media capability supported by the calling side device as the preferred media. Capability, if not, selecting a preferred media capability that matches the jitter value among media capabilities supported by the calling side device;

or,

When the network transmission quality includes a MOS value, the call control network element determines whether the MOS value is greater than a second threshold, and if yes, selecting a media capability supported by the calling side device as the preferred media capability, if No, in the media capabilities supported by the calling side device, a preferred media capability that matches the MOS value is selected.

When the network transmission quality includes one of a packet loss rate, a delay, a jitter, and a MOS value, it may be determined according to the foregoing whether the indicators meet the requirements, and when the judgment result of both the calling side device and the called side device is yes, (If the packet loss rate is less than the preset packet loss rate value, the jitter is less than the preset first. The threshold, the delay is less than the preset time extension, and the MOS value is greater than the second threshold, determining that the network transmission quality meets a preset network transmission quality condition, and when selecting the media capability supported by the calling side device is the Preferably, when the result of the determination is no, the media capability supported by the calling side device is selected to match the network transmission quality (loss rate, delay, jitter, MOS value). Media capabilities.

When the network transmission quality includes multiple types of packet loss rate, delay, jitter, and MOS value, when the calling side device and the called side device meet the requirements, the packet loss rate is smaller than the preset packet loss rate. When the value, the jitter is less than the preset first threshold, the delay is less than the preset time extension, and the MOS value is greater than the second threshold, determining that the network transmission quality meets a preset network transmission quality condition, and selecting the calling party The media capability supported by the side device is the preferred media capability. When the multiple indicators included in this part are only partially satisfied, partially not satisfied, or all are not satisfied, the phase may be selected according to whether the indicators meet the specific conditions. Matching preferred media capabilities, for example, assuming that the packet loss rate is greater than the preset packet loss rate value (not meeting the requirements), and other indicators are satisfactory, because the iLBC codec is more resistant to packet loss, then the selection is preferred. It is more appropriate to prioritize the iLBC codec in the media capabilities, such as adjusting the iLBC codec to the preferred one, or filtering out other codecs.

For example, when the audio media capabilities supported by the calling side device include three audio media capabilities, the features are as follows:

G.711 codec: The feature is that the encoding quality is good, and the user will get better voice quality without packet loss, but the media transmission bandwidth is relatively large.

G.729 codec: The encoding quality is not as good as G.711, but the media transmission bandwidth is relatively small.

iLBC codec: The encoding quality is similar to that of G.729. The bandwidth is slightly higher than G.729 and smaller than G.711, but the anti-dropping capability is stronger.

(1) If the quality of the primary and called media transmission is good, you can choose the media capability with high transmission quality, such as selecting G.711 codec;

Assume that the SDP parameters in the received call request (only the main parameters are listed, other parameters are omitted)

m=audio xxxxxx RTP/AVP 18 0 98

a=rtpmap:18 G729/8000

a=rtpmap:0 PCMU/8000

a=rtpmap:98 iLBC/8000

a=fmtp:98 mode=20

a=ptime:20

Adjusted SDP parameters

m=audio xxxxxx RTP/AVP 0 18 98

a=rtpmap:0 PCMU/8000

a=rtpmap:18 G729/8000

a=rtpmap:98 iLBC/8000

a=fmtp:98 mode=20

a=ptime:20

After this selection, the session can get better call quality.

(2) If the quality of the primary and called media transmission is not good, such as high packet loss rate, you can choose to compare the anti-drop packet media capabilities, such as iLBC codec;

m=audio xxxxxx RTP/AVP 18 0 98

a=rtpmap:18 G729/8000

a=rtpmap:0 PCMU/8000

a=rtpmap:98 iLBC/8000

a=fmtp:98 mode=20

a=ptime:20

Adjusted SDP parameters:

m=audio xxxxxx RTP/AVP 98 0 18

a=rtpmap:98 iLBC/8000

a=fmtp:98 mode=20

a=rtpmap:0 PCMU/8000

a=rtpmap:18 G729/8000

a=ptime:20

After this selection, although there is packet loss on the media transmission path, a good call quality guarantee can still be obtained.

(3) When the quality of the network transmission on the call path of the calling side device and the called side device is good, and one is poor, the preferred medium can be selected based on the support of the device with poor network transmission quality on the call path. Ability, not limited here.

The network transmission quality of the calling side device and the called device in the call path is good or bad. According to the packet loss rate value, the delay value, the jitter value, the MOS value, the preset packet loss rate value, and the delay. The comparison of the value, the first threshold, and the second threshold results in that when the above comparison is YES, it means that the network transmission quality is good and meets the requirements.

When the network transmission quality does not meet the preset network transmission quality condition, among the media capabilities supported by the calling side device, selecting a preferred media capability that matches the network transmission quality of the called side device on the call path The SDP parameters in the call request can be modified in one or more ways as shown in Figure 3:

(2) when the media capability supported by the calling device includes media capabilities of multiple types of media encoding and decoding, according to the network transmission quality, the media capability is occupied by the media capability supported by the calling device The media capability of the bandwidth matching the network transmission quality of the called side device on the call path is adjusted to the preferred.

(3) when the media capability supported by the calling side device includes media capabilities of multiple types of media codecs, according to the network transmission quality of the called side device on the call path, supported by the calling side device In the media capabilities, media capabilities that do not match the quality of the network transmission are filtered.

(4) When the media capability supported by the calling side device includes multiple rate sets of the same type of media codec, according to the correspondence between the network transmission quality and the rate mode, the media supported by the calling side device In the capability, a set of rate patterns matching the network transmission quality of the called side device on the call path is selected, and the rate mode set includes at least one rate mode.

The detailed process of the above-mentioned specific modification of the SDP parameters in the call request refers to the specific process in the embodiment shown in FIG. 3, and details are not described herein again.

When the media transmission state of the called side device on the call path may further include one of the access modes, such as a Wi-Fi access mode, an LTE access mode, or the like.

404. The call control network element updates the media capability supported by the calling side device in the call request to a preferred media capability.

The call control network element adjusts the media capability supported by the calling side device in the received call request to the determined preferred media capability, for example, the media capability supported by the calling side device is G.711 and G.729, iLBC codec. The audio media capability, according to the obtained network transmission quality (such as the packet loss rate is not high, the transmission bandwidth uses the iLBC codec), the preferred media capability is the audio media capability of G.711, G.729, and the call request is The media capability is adjusted to the preferred media capabilities of the G.711, G.729 codec.

405. The call control network element forwards the call request after updating the media capability to the called side device.

After updating the media capability in the call request, the call control network element forwards the call request after updating the media capability to the called side device, so that the called side device according to the preferred media in the call request after updating the media capability The capability selects the session media capability, and returns a call response to the call control network element, where the call response carries the session media capability selected by the called side device according to the preferred media capability, for example, the called side device itself also supports G.711. The preferred media capability of G.729 may select a session media capability, such as G.711, and return a call response to the call control network element, where the call response includes session media capabilities;

406. The call control network element sends a response to the calling side device.

In this embodiment, after receiving the call response returned by the called side device, the call control network element sends a response to the calling side device. In step 402, the call control network element obtains the calling side device and the called side device. a media transmission state on the call path, the calling side device also uses the session media capability determined by the called side device, and the response may carry the session media capability determined by the called side device;

In a practical application, when the call control network element acquires the calling side device and the called side device When the media side of the call is in the media transmission state, the calling device can use the media capability determined by itself as the media capability of the session. In this case, the response can carry the calling device on the call path. The preferred media capability that matches the media transmission status is not limited herein, so that the call control network element completes the selection of the media capabilities of the calling side device and the called side device, and the session can be based on the calling side device and the called side. The media capabilities selected by the devices are used for the session, which is not limited herein.

In the embodiment shown in FIG. 4, the call control network element may also select the media capability number for the primary called party based on the status of the primary and the called media transmission path, to more finely control the media capabilities used on different media transmission paths. Referring to FIG. 5, another embodiment of a method for determining media capabilities in an embodiment of the present invention includes:

501. The call control network element receives a call request of the calling side device.

502. The call control network element acquires a media transmission status of the calling side device and the called side device on the call path.

In this embodiment, the media transmission status of the calling side device and the called side device on the call path is also the network transmission quality of the calling side device and the called side device on the call path, and the call control network element can be docked. Many networks can also dock many devices, but no matter how they are connected The communication is performed based on the IP address, so the call control network element can perform real-time statistics on the network transmission quality of each IP address pair on the basis of the IP address pair, and the statistics can be all for each address pair. The user or part of the sampled user has the statistics of the service. The IP address pair is the call path between the IP addresses of the two devices. Before the session is established, the call control network element can obtain the call path of the calling side device and the called side device. The quality of the network transmission on the (IP address pair). The network transmission quality may include a packet loss rate, a delay, a jitter, and a MOS value, which are not limited herein.

503. The call control network element selects a preferred media capability that matches a media transmission state of the called side device on the call path according to a media transmission state of the called side device on the call path.

In this embodiment, the preferred media capability that the call control network element selects to match the media transmission status of the called side device on the call path according to the media transmission status of the called side device on the call path includes:

The call control network element determines whether the network transmission quality of the called side device on the call path meets a preset network transmission quality condition, and if yes, selects the media capability supported by the calling side device as the preferred media capability, If not, selecting, among the media capabilities supported by the calling side device, a preferred media capability that matches the network transmission quality of the called side device on the call path;

iLBC codec: The encoding quality is similar to that of G.729, and the bandwidth is slightly higher than G.729 and smaller than G.711. However, the ability to resist packet loss is strong.

Assume that all three media capabilities can be used for the current media session, but only one must be selected. If the G.729 codec is preferred according to the basic process, the media selected by the called device is not used for special control. The codec is G.729, but this choice may not be the best choice. It is assumed that the packet loss rate of the called side device on the call path (media transmission path) is high according to the acquired network transmission quality of the called side device. Since the iLBC codec is more resistant to packet loss, the iLBC codec is more suitable. In this case, the media capability of the iLBC codec is the quality of the network transmission on the call path of the called device. Matching preferred media capabilities.

As shown in Table 2, similarly, the network transmission quality indicator such as the time extension length, the jitter size, and the MOS value may also select a preferred media capability, or may be a combination of one or more of the above network transmission quality indicators. There is no limit.

In this embodiment, the preferred media capability that the call control network element selects to match the network transmission quality of the called side device on the call path includes:

or,

When the network transmission quality includes a MOS value, the call control network element determines whether the MOS value is greater than a second threshold, and if yes, selects a media capability supported by the calling side device For the preferred media capability, if not, selecting a preferred media capability that matches the MOS value among the media capabilities supported by the calling side device.

When the network transmission quality includes one of the packet loss rate, the delay, the jitter, and the MOS value, it may be determined according to the foregoing whether the indicators meet the requirements, and when the judgment result is yes (for example, the packet loss rate is less than the preset packet loss) The rate value, the jitter is less than the preset first threshold, the delay is less than the preset time extension, and the MOS value is greater than the second threshold. The network transmission quality is determined to meet the preset network transmission quality condition, and the calling party is selected. The media capability supported by the side device is the preferred media capability. When the determination result is no, the media transmission quality (the packet loss rate, the delay, and the packet loss rate) are selected among the media capabilities supported by the calling device. Preferred media capabilities that match jitter, MOS values).

When the network transmission quality includes multiple types of packet loss rate, delay, jitter, and MOS value, when these multiple indicators meet the requirements (such as the packet loss rate is less than the preset packet loss rate value, the jitter is less than the preset first). When the threshold, the delay is less than the preset time extension, and the MOS value is greater than the second threshold, determining that the network transmission quality meets a preset network transmission quality condition, and selecting a media capability supported by the calling side device is the Preferably, the media capability, when the plurality of indicators included in the plurality of indicators are only partially satisfied, partially not satisfied, or all are not satisfied, may select a matching preferred media capability according to whether the indicators meet the specific conditions, for example, assuming The packet loss rate is greater than the preset packet loss rate (not satisfied), and other indicators meet the requirements. Because the iLBC codec has strong anti-drop capability, the selected preferred media capability is preferred to the iLBC codec. It is more appropriate, such as adjusting the iLBC codec to the preferred one, or filtering out other codecs.

(3) When the media capability supported by the calling side device includes multiple types of media codec media In the physical capability, according to the network transmission quality of the called side device on the call path, media capabilities that do not match the network transmission quality are filtered in the media capabilities supported by the calling side device.

504. The call control network element updates the media capability supported by the calling side device in the call request to a preferred media capability.

505. The call control network element forwards the call request after updating the media capability to the called side device.

After updating the media capability in the call request, the call control network element forwards the call request after updating the media capability to the called side device, so that the called side device according to the updated media capability The preferred media capability in the subsequent call request selects the session media capability and returns a call response to the call control network element, the call response carrying the session media capabilities selected by the called side device according to the preferred media capability, such as called The side device itself also supports the preferred media capabilities of G.711 and G.729, and then a session media capability, such as G.711, can be selected and a call response is returned to the call control network element, where the call response includes session media. ability;

506. The call control network element selects a preferred media capability that matches a media transmission state of the calling side device on the call path according to a media transmission state of the calling side device on the call path.

In this embodiment, the preferred media capability that the call control network element selects to match the media transmission status of the calling side device on the call path according to the media transmission status of the calling side device on the call path includes:

The call control network element determines whether the network transmission quality of the calling side device on the call path satisfies the preset network transmission quality condition, and if so, selects the media capability supported by the calling side device as the preferred media capability, and if not And selecting, among the media capabilities supported by the calling side device, a preferred media capability that matches the network transmission quality of the calling side device on the call path.

In this embodiment, the call control network element selects a preferred media capability that matches the media transmission state of the calling side device on the call path according to the media transmission status of the calling side device on the call path, and implements in step 403. The method is similar and will not be described here.

507. The call control network element sends a response to the calling side device.

After the call control network element determines the preferred media capability that matches the media transmission status of the calling side device on the call path, the call control network element sends a response to the calling side device, where the response carries the calling side device in the call. The media transmission status on the path matches the preferred media capability, so that the calling side device selects the media capability when the session is performed with the called side device according to the preferred media capability, so that the call control network element completes the main By selecting the media capabilities of the side device and the called side device, the session can be based on the media capabilities selected by the calling side device and the called side device.

In the embodiment of the present invention, after receiving the call request of the calling side device, the call control network element determines a preferred media according to the media transmission status of the at least one of the obtained calling side device and the called side device on the call path. Capability, enabling the called side device to select a session media capability from the preferred media capabilities, since the selected session media capability is a preference determined from the media transmission state The media capability is selected to match the media transmission status of the current session, which improves the session quality and the user experience is good;

Secondly, according to the media transmission status of the calling side device and the called side device on the call path, the preferred media capabilities of the calling side device and the called side device for the session are respectively determined, so that different paths are processed separately, and one side can be avoided. The situation where the media transfer status is not available and the entire session media capability cannot be optimized.

It should be noted that, in the foregoing method embodiments, the audio media capability is used as an example for illustration. It is to be understood that the video media capability is also applicable to the foregoing method embodiments, which are not limited herein.

The following describes an embodiment of the call control network element in the embodiment of the present invention. Referring to FIG. 6, an embodiment of the call control network element in the embodiment of the present invention includes:

The receiving unit 601 is configured to receive a call request of the calling side device;

The processing unit 602 is configured to obtain a media transmission status of at least one of the calling side device and the called side device on the call path.

The processing unit 602 is further configured to determine, according to the acquired media transmission status, a media capability when establishing a session between the calling side device and the called side device.

In this embodiment, the processing unit 602 of the call control network element determines the calling side device and the called side device according to the acquired media transmission status of the calling side device and the called side device in the call path. The media capability between the establishment of the session is improved. The selected session media capability is determined according to the media transmission status, and matches the media transmission status of the current session, thereby improving the session quality and the user experience is good.

Optionally, the processing unit 602 is further configured to:

Optionally, the call control network element further includes:

The sending unit 603 is configured to forward, to the called side device, a call request after updating the media capability;

The receiving unit 601 is further configured to receive a call response returned by the called side device, where The call response carries the session media capability selected by the called side device according to the preferred media capability;

The sending unit 603 is further configured to send a response to the calling side device.

Optionally, the processing unit 602 is specifically configured to:

The sending unit 603 is specifically configured to send the response to the calling side device, where the response carries the session media capability.

Optionally, the processing unit 602 is configured to determine whether the signal state meets a preset state when a media transmission state of the one of the call paths includes a signal state of the wireless air interface. a signal state condition, if yes, selecting a media capability supported by the calling side device as the preferred media capability, and if not, selecting a media capability with a low occupied bandwidth among the media capabilities supported by the calling side device The preferred media capabilities.

Optionally, the processing unit 602 is specifically configured to: when the audio media capability and the video media capability are included in the media capability supported by the calling side device, filter the video media capability.

Optionally, the processing unit 602 is specifically configured to:

or,

Optionally, the processing unit 602 is specifically configured to: when the one of the media transmission states on the call path includes the access mode of the one of the ones, and the access mode of the one of the ones is Wi In the access mode of the Fi, when the calling side device supports the anti-drop packet media capability, the preferred media capability is selected among the anti-lost media capabilities.

Optionally, the processing unit 602 is specifically configured to:

The processing unit 602 is further configured to: select, according to a media transmission status of the calling side device on a call path, a preferred media capability that matches a media transmission state of the calling side device on a call path;

The sending unit 603 is specifically configured to send the response to the calling side device, where the response carries a preferred media capability that matches the media transmission status of the calling side device on the call path.

Optionally, the processing unit 602 is specifically configured to:

The processing unit 602 is further configured to determine whether the network transmission quality of the calling side device on the call path meets a preset network transmission quality condition, and if yes, select the media capability supported by the calling side device as a location. The preferred media capability, if not, selects a preferred media capability that matches the network transmission quality of the calling side device on the call path among the media capabilities supported by the calling side device.

Optionally, the processing unit 602 is specifically configured to:

Obtaining an access mode of the calling side device and the called side device;

The access mode of the called side device is a Wi-Fi access mode, and the calling side is set. When the media capability against packet loss is supported, the preferred media capability is selected among the anti-lost media capabilities;

The processing unit 602 is further configured to: when the access mode of the calling side device is a Wi-Fi access mode, and the calling side device supports the media capability against packet loss, The preferred media capabilities are selected among the media capabilities of the package.

The call control network element in the embodiment of the present invention is described above from the perspective of a unitized functional entity. The following describes the call control network element in the embodiment of the present invention from the perspective of hardware processing. Referring to FIG. 7, the embodiment of the present invention is described. The call control network element in the middle includes: a receiver 701, a transmitter 702, and a processor 703 (which may have one or more).

The terminal according to the embodiment of the present invention may have more or less components than those shown in FIG. 7, may combine two or more components, or may have different component configurations or settings, and each component may include one Hardware, software, or a combination of hardware and software, including multiple signal processing and/or application specific integrated circuits.

The receiver 701 is configured to perform the following operations:

Receive a call request from the calling side device.

The processor 703 is configured to perform the following operations:

Obtaining a media transmission status of at least one of the calling side device and the called side device on the call path.

The processor 703 is further configured to perform the following operations:

Determining, according to the media transmission status, a media capability when establishing a session between the calling side device and the called side device;

In some embodiments of the present invention, the processor 703 is further configured to perform the following operations:

Updating the media capabilities supported by the calling side device in the call request to the preferred media capabilities.

The transmitter 702 can also be used to perform the following operations:

Forwarding the call request after updating the media capability to the called side device.

The receiver 701 is further configured to perform the following operations:

Receiving a call response returned by the called side device, where the call response carries the called side Session media capabilities selected by the device based on the preferred media capabilities

The transmitter 702 can also be configured to perform the following operations:

A response is sent to the calling side device.

The transmitter 703 can also be configured to perform the following operations:

Sending the response to the calling side device, where the response carries the session media capability.

Determining whether the signal state satisfies a preset signal state condition when the media transmission state of the one of the call paths includes a signal state of the wireless air interface, and if so, selecting the caller The media capability supported by the side device is the preferred media capability. If not, the media capability that is low in bandwidth is selected as the preferred media capability among the media capabilities supported by the calling device.

or,

When the media capabilities supported by the calling side device include multiple types of media codecs of the same type And selecting, according to a preset relationship between the preset signal state and the rate mode, a media mode set supported by the calling side device, and selecting a rate mode set that matches the signal state, where the rate mode set includes At least one rate mode.

When the one of the media transmission states on the call path includes the access mode of one of the access modes, and the access mode of one of the access modes is a Wi-Fi access mode, the calling side When the device supports the anti-drop packet media capability, the preferred media capability is selected among the anti-lost media capabilities.

Selecting a preferred media capability that matches the media transmission state of the calling side device on the call path according to the media transmission status of the calling side device on the call path;

The transmitter 702 can also be used to perform the following operations:

Sending the response to the calling side device, where the response carries a preferred media capability that matches the media transmission status of the calling side device on the call path.

Determining whether the network transmission quality of the calling side device on the call path meets a preset network transmission quality condition, and if yes, selecting the media capability supported by the calling side device as the preferred media capability, and if not, Among the media capabilities supported by the calling side device, a preferred media capability that matches the network transmission quality of the calling side device on the call path is selected.

Obtaining an access mode of the calling side device and the called side device;

Selecting a preferred media capability among the anti-dropping media capabilities when the access mode of the calling device is a Wi-Fi access mode, and the calling device supports the anti-dropping media capability. .

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed system, apparatus, and method may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, or all or part of the technical solution, may be embodied in the form of a software product stored in a storage medium. , including a number of instructions to make a computer device (may be A personal computer, server, or network device, etc.) performs all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the embodiments are modified, or the equivalents of the technical features are replaced by the equivalents of the technical solutions of the embodiments of the present invention.

Claims

A method of determining media capabilities, comprising:

The call control network element receives the call request of the calling side device;

The call control network element acquires a media transmission status of at least one of the calling side device and the called side device on the call path;

The call control network element determines, according to the media transmission status, a media capability when establishing a session between the calling side device and the called side device.
The method according to claim 1, wherein the call request includes a media capability supported by the calling side device;

The determining, by the call control network element, the media capability when establishing a session between the calling side device and the called side device according to the media transmission status includes:

The call control network element selects a preferred media capability that matches the media transmission state according to the media transmission status;

The call control network element updates the media capability supported by the calling side device in the call request to the preferred media capability;

The call control network element forwards a call request after updating the media capability to the called side device;

Receiving, by the call control network element, a call response returned by the called side device, where the call response carries a session media capability selected by the called side device according to the preferred media capability;

The call control network element sends a response to the calling side device.
The method according to claim 2, wherein the obtaining, by the call control network element, the media transmission status of at least one of the calling side device and the called side device on the call path comprises:

The call control network element acquires a media transmission status of one of the calling side device and the called side device on the call path;

The selecting, by the call control network element, the preferred media capabilities that match the media transmission status according to the media transmission status includes:

The call control network element selects a preferred media capability that matches the media transmission state according to a media transmission status of the one of the ones on the call path;

The call control network element sends a response to the calling side device, including:

The call control network element sends the response to the calling side device, where the response carries the session media capability.
The method according to claim 3, wherein the media transmission state of one of the call paths includes a signal state of the wireless air interface of the one of the ones;

The selecting, by the call control network element, the preferred media capabilities that match the media transmission status according to the media transmission status includes:

Determining, by the call control network element, whether the signal state satisfies a preset signal state condition, and if yes, selecting a media capability supported by the calling side device as the preferred media capability, and if not, at the calling Among the media capabilities supported by the side devices, the media capability that occupies a low bandwidth is selected as the preferred media capability.
The method according to claim 4, wherein the selecting the media capability that occupies a low bandwidth for the preferred media capability comprises:

The video media capability is filtered when the media capabilities supported by the calling side device include audio media capabilities and video media capabilities.
The method according to claim 4 or 5, wherein the selecting a medium capacity that occupies a low bandwidth among the media capabilities supported by the calling side device is the preferred media capability comprises:

When the media capability supported by the calling side device includes media capabilities of multiple types of media encoding and decoding, according to the corresponding relationship between the preset signal state and the media capability, in the media capability supported by the calling side device, The media capabilities that match the signal state are adjusted to preferred,

or,

When the media capability supported by the calling side device includes media capabilities of multiple types of media encoding and decoding, according to the corresponding relationship between the preset signal state and the media capability, in the media capability supported by the calling side device, Media capability filtering that does not match the signal state,

or,

When the media capabilities supported by the calling side device include multiple rate sets of the same type of media codec, according to the corresponding relationship between the preset signal state and the rate mode, among the media capabilities supported by the calling side device, A set of rate patterns is selected that match the state of the signal, the set of rate patterns including at least one rate pattern.
The method according to claim 3, wherein the media transmission status of one of the call paths comprises an access mode of one of the ones;

The selecting, by the call control network element, the preferred media capability that matches the media transmission status of the calling side device on the call path according to the media transmission status of the calling side device on the call path includes:

The anti-dropping media capability of the call control network element when the access mode of the one of the access modes is a Wi-Fi access mode, and the calling side device supports the anti-drop packet media capability Select preferred media capabilities.
The method according to claim 2, wherein the obtaining, by the call control network element, the media transmission status of at least one of the calling side device and the called side device on the call path comprises:

The call control network element acquires a media transmission status of the calling side device and the called side device on a call path;

The selecting, by the call control network element, the preferred media capabilities that match the media transmission status according to the media transmission status includes:

The call control network element selects a preferred media capability that matches the media transmission state of the called side device on the call path according to the media transmission status of the called side device on the call path;

The method further includes:

Selecting, by the call control network element, a preferred media capability that matches a media transmission state of the calling side device on a call path according to a media transmission state of the calling side device on a call path;

The call control network element sends a response to the calling side device, including:

The call control network element sends the response to the calling side device, where the response carries a preferred media capability that matches the media transmission status of the calling side device on the call path.
The method according to claim 8, wherein the obtaining, by the call control network element, the media transmission status of the calling side device and the called side device on the call path comprises:

The call control network element acquires network transmission quality of the calling side device and the called side device on a call path;

The call control network element according to the media transmission state of the called side device on the call path The preferred media capabilities that match the media transmission status of the called side device on the call path include:

The call control network element determines whether the network transmission quality of the called side device on the call path meets a preset network transmission quality condition, and if yes, selects the media capability supported by the calling side device as the preferred medium. Capability, if not, selecting a preferred media capability that matches the network transmission quality of the called side device on the call path among the media capabilities supported by the calling side device;

The selecting, by the call control network element, the preferred media capability that matches the media transmission status of the calling side device on the call path according to the media transmission status of the calling side device on the call path includes:

The call control network element determines whether the network transmission quality of the calling side device on the call path meets a preset network transmission quality condition, and if yes, selects the media capability supported by the calling side device as the preferred media. The capability, if not, selects a preferred media capability that matches the network transmission quality of the calling side device on the call path among the media capabilities supported by the calling side device.
The method according to claim 8, wherein the call control network element acquires the media transmission status of the calling side device and the called side device on the call path, including:

The call control network element acquires an access mode of the calling side device and the called side device;

The selecting, by the call control network element, the preferred media capability that matches the media transmission state of the called side device on the call path according to the media transmission status of the called side device on the call path includes:

When the access control mode of the call control network element is a Wi-Fi access mode, and the calling side device supports the anti-drop packet media capability, the anti-drop packet media Selecting preferred media capabilities among capabilities;

The selecting, by the call control network element, the preferred media capability that matches the media transmission status of the calling side device on the call path according to the media transmission status of the calling side device on the call path includes:

When the access control mode of the calling control device is a Wi-Fi access mode, and the calling side device supports the anti-drop packet media capability, the anti-drop packet media can Select the preferred media capabilities.
A call control network element, comprising:

a receiving unit, configured to receive a call request of the calling side device;

a processing unit, configured to acquire a media transmission status of at least one of the calling side device and the called side device on the call path;

The processing unit is further configured to determine, according to the acquired media transmission status, a media capability when establishing a session between the calling side device and the called side device.
The call control network element according to claim 11, wherein the processing unit is further configured to:

When the media capability supported by the calling side device is included in the call request, selecting a preferred media capability that matches the media transmission state according to the media transmission state;

Updating the media capability supported by the calling side device in the call request to the preferred media capability;

The call control network element further includes:

a sending unit, configured to forward, to the called side device, a call request after updating the media capability;

The receiving unit is further configured to receive a call response returned by the called side device, where the call response carries a session media capability selected by the called side device according to the preferred media capability;

The sending unit is further configured to send a response to the calling side device.
The call control network element according to claim 12, wherein the processing unit is specifically configured to:

Obtaining a media transmission status of one of the calling side device and the called side device on the call path;

Selecting a preferred media capability that matches the media transmission state according to a media transmission status of one of the ones on the call path;

The sending unit is specifically configured to send the response to the calling side device, where the response carries the session media capability.
The call control network element according to claim 13, wherein the processing unit is configured to: when the media transmission state of the one of the call paths includes a signal state of the wireless air interface Determining whether the signal state satisfies a preset signal state condition, and if yes, selecting a media capability supported by the calling side device as the preferred media The physical capability, if not, selects a medium capacity that occupies a low bandwidth as the preferred media capability among the media capabilities supported by the calling side device.
The call control network element according to claim 14, wherein the processing unit is specifically configured to: when the audio media capability and the video media capability are included in a media capability supported by the calling side device, the video media Ability to filter.
The call control network element according to claim 14 or 15, wherein the processing unit is specifically configured to:

When the media capability supported by the calling side device includes media capabilities of multiple types of media encoding and decoding, according to the corresponding relationship between the preset signal state and the media capability, in the media capability supported by the calling side device, The media capabilities that match the signal state are adjusted to preferred,

or,

When the media capability supported by the calling side device includes media capabilities of multiple types of media encoding and decoding, according to the corresponding relationship between the preset signal state and the media capability, in the media capability supported by the calling side device, Media capability filtering that does not match the signal state,

or,

When the media capabilities supported by the calling side device include multiple rate sets of the same type of media codec, according to the corresponding relationship between the preset signal state and the rate mode, among the media capabilities supported by the calling side device, A set of rate patterns is selected that match the state of the signal, the set of rate patterns including at least one rate pattern.
The call control network element according to claim 13, wherein the processing unit is specifically configured to: when the one of the media transmission states on the call path includes one of the access modes, and The access mode of the one of the access modes is a Wi-Fi access mode, and when the calling side device supports the anti-drop packet media capability, the preferred media capability is selected among the anti-lost media capabilities.
The call control network element according to claim 12, wherein the processing unit is specifically configured to:

Obtaining a media transmission status of the calling side device and the called side device on a call path;

Determining, according to the media transmission status of the called side device on the call path, a preferred media capability that matches the media transmission status of the called side device on the call path;

The processing unit is further configured to select, according to a media transmission status of the calling side device on a call path, a preferred media capability that matches a media transmission state of the calling side device on a call path;

The sending unit is specifically configured to send the response to the calling side device, where the response carries a preferred media capability that matches the media transmission status of the calling side device on the call path.
The call control network element according to claim 18, wherein the processing unit is specifically configured to:

Obtaining network transmission quality of the calling side device and the called side device on a call path;

Determining whether the network transmission quality of the called side device on the call path meets a preset network transmission quality condition, and if yes, selecting the media capability supported by the calling side device as the preferred media capability, and if not, Selecting, among the media capabilities supported by the calling side device, a preferred media capability that matches the network transmission quality of the called side device on the call path;

The processing unit is further configured to determine whether the network transmission quality of the calling side device on the call path meets a preset network transmission quality condition, and if yes, select the media capability supported by the calling side device to be the Preferably, the media capability, if not, selects a preferred media capability that matches the network transmission quality of the calling side device on the call path among the media capabilities supported by the calling side device.
The call control network element according to claim 18, wherein the processing unit is specifically configured to:

Obtaining an access mode of the calling side device and the called side device;

Selecting a preferred media capability among the anti-dropping media capabilities when the access mode of the called device is a Wi-Fi access mode, and the calling device supports the anti-dropping media capability. ;

The processing unit is further configured to: when the access mode of the calling side device is a Wi-Fi access mode, and the calling side device supports the anti-drop packet media capability, the anti-drop packet The preferred media capabilities are selected among the media capabilities.
A call control network element, comprising:

a receiver, configured to receive a call request of the calling side device;

a processor, configured to acquire at least one of a calling side device and a called side device on a call path Media transfer status;

The processor is further configured to determine, according to the media transmission status, a media capability when establishing a session between the calling side device and the called side device.