CN109257323B - Call method and device - Google Patents

Call method and device Download PDF

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Publication number
CN109257323B
CN109257323B CN201710573275.8A CN201710573275A CN109257323B CN 109257323 B CN109257323 B CN 109257323B CN 201710573275 A CN201710573275 A CN 201710573275A CN 109257323 B CN109257323 B CN 109257323B
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uas
session
uac
message
updating
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CN109257323A (en
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许冬艳
梁超
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1045—Proxies, e.g. for session initiation protocol [SIP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1069—Session establishment or de-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols
    • H04L65/1104—Session initiation protocol [SIP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/65—Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]

Abstract

The invention discloses a call method and a device, which relate to the field of VoLTE, and the method comprises the following steps: the proxy server determines a session updating mode of the long term evolution voice scheme VoLTE call negotiated by a user agent client UAC and a user agent server UAS; and if the session updating mode is determined to be a mode of updating the session by using an RTP (real-time transport protocol) data packet, the proxy server updates the VoLTE call state according to the RTP data packet interacted between the UAC and the UAS. According to the embodiment of the invention, the re-INVITE or UPDATE message is embedded into the RTP data packet for interactive updating, so that extra control signaling updating conversation is not added in the conversation process, the VoLTE conversation quality is improved, and the call drop rate is reduced.

Description

Call method and device
Technical Field
The present invention relates to the field of Voice over Long-Term Evolution (VoLTE) Voice schemes, and in particular, to a method and an apparatus for call.
Background
The Session Initiation Protocol (SIP) does not define a survival mechanism for an established Session, and the prior art uses a Session Timer (Session Timer) mechanism defined by RFC 4028. Specifically, during the existing VoLTE call, the user agent periodically sends a session UPDATE request (re-INVITE or UPDATE) message to keep the session active, the interval of the session UPDATE request is determined by the defined negotiation mechanism, if the session UPDATE request is not received within the interval, the session is considered to be terminated, the user agent sends a BYE message, and the proxy server removes the call.
Although the user agent may determine whether the Session has timed out through the Session-specific Session Timer mechanism, the proxy server cannot do so. As such, the proxy server sometimes cannot determine whether the session is still active. For example, when a user agent fails to send a BYE message at the end of a session, or the BYE message is lost due to network problems, the proxy server will not know that the session has ended. In this case, the proxy server will maintain the state of the call and cannot know when the call state information fails.
Further, in the actual use process, in the case where the Session monitoring function (for example, every 2 minutes and 30 seconds) performed by the user agent and the proxy server is operated, since the priority of the control signal is higher than the priority of the voice data, the processing of the control signal is prioritized, the voice bandwidth is narrowed, and the voice quality is degraded; in the case of weak signals, if a session update request is not received within an interval time, a high probability of a VoLTE call drop is caused, and therefore, in a region where VoLTE is widely used, user complaints about call drop are increasing.
Disclosure of Invention
According to the call method and the call device provided by the embodiment of the invention, the problems of poor VoLTE call quality and high call drop probability are solved.
The call method provided by the embodiment of the invention comprises the following steps:
the proxy server determines a session updating mode of the VoLTE call negotiated by the user agent client UAC and the user agent server UAS;
and if the session updating mode is determined to be a mode of updating the session by using an RTP (real-time transport protocol) data packet, the proxy server updates the VoLTE call state according to the RTP data packet interacted between the UAC and the UAS.
Preferably, the determining, by the proxy server, a session update mode of the VoLTE call negotiated by the UAC and the UAS includes:
and the proxy server determines a session updating mode of the VoLTE call negotiated by the UAC and the UAS according to a Session Initiation Protocol (SIP) message interacted between the UAC and the UAS during the VoLTE call establishment.
Preferably, the SIP message includes an INVITE message and a 200OK message, and the determining, by the proxy server, a session update mode of the VoLTE call negotiated by the UAC and the UAS according to the SIP message interacted between the UAC and the UAS during the setup of the VoLTE call includes:
and if the INVITE message sent by the UAC carries a high-quality VoLTE identifier and the 200OK message responded by the UAS is an acknowledgement message, the proxy server determines that the session updating mode negotiated by the UAC and the UAS in the call process is a self-defined mode for updating the session by using an RTP (real-time transport protocol) data packet.
Preferably, if it is determined that the session is updated by using an RTP packet, the updating, by the proxy server, the VoLTE call state according to the RTP packet interacted between the UAC and the UAS includes:
and after establishing the VoLTE call between the UAC and the UAS, the proxy server detects whether an RTP data packet interacted between the UAC and the UAS carries a session update message or not, and updates the VoLTE call state according to a detection result.
Preferably, the session update message includes an update request message and an update response message, and the updating the VoLTE call state according to the detection result includes:
and if the proxy server detects that the RTP data packet from the UAC or the UAS carries an update request message and the RTP data packet responded by the opposite side carries an update response message, determining that the VoLTE call state is updated successfully.
According to a storage medium provided by an embodiment of the present invention, a program for implementing the above-described call method is stored.
According to an embodiment of the present invention, a communication device includes:
the updating mode negotiation module is used for determining a session updating mode of the VoLTE call of the long-term evolution voice scheme negotiated by the user agent client UAC and the user agent server UAS;
and the call state updating module is used for updating the VoLTE call state by the proxy server according to the RTP data packet interacted between the UAC and the UAS if the mode of session updating by using the RTP data packet is determined.
Preferably, the update mode negotiation module determines a session update mode of the VoLTE call negotiated by the UAC and the UAS according to a session initiation protocol SIP message interacted between the UAC and the UAS during the setup of the VoLTE call.
Preferably, the SIP message includes an INVITE message and a 200OK message, and the update mode negotiation module determines that the session update mode negotiated between the UAC and the UAS in the current call process is a mode of performing session update using an RTP packet when the INVITE message sent by the UAC carries a high-quality VoLTE identity and the 200OK message responded by the UAS is an acknowledgment message.
Preferably, the call state updating module detects whether an RTP data packet interacted between the UAC and the UAS carries a session update message after the UAC and the UAS establish a VoLTE call, and updates the VoLTE call state according to a detection result.
Preferably, the session update message includes an update request message and an update response message, and if the session state update module detects that an RTP data packet from the UAC or the UAS carries the update request message and an RTP data packet responded by an opposite party carries the update response message, it determines that the update of the VoLTE session state is successful.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the embodiment of the invention embeds the existing session updating message into the RTP data packet for interactive updating, does not increase extra control signaling updating session in the conversation process, improves the VoLTE conversation quality and reduces the call drop rate.
Drawings
Fig. 1 is a flowchart of a call method according to an embodiment of the present invention;
fig. 2 is a flowchart of a UAC establishing a call with a UAS and a general session management according to an embodiment of the present invention;
fig. 3 is a flowchart of session management for establishing a call between a UAC and a UAS and improving call quality according to an embodiment of the present invention;
fig. 4 is a block diagram of a communication device according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, and it should be understood that the preferred embodiments described below are only for the purpose of illustrating and explaining the present invention, and are not to be construed as limiting the present invention.
Fig. 1 is a flowchart of a call method according to an embodiment of the present invention, and as shown in fig. 1, the steps include:
step S101: and the proxy server determines the session updating mode of the VoLTE call negotiated by the UAC and the UAS.
Step S101 includes: and the proxy server determines a session updating mode of the VoLTE call negotiated by the UAC and the UAS according to SIP information interacted between the UAC and the UAS during the VoLTE call establishment. Specifically, the SIP message includes an INVITE message and a 200OK message, and if the INVITE message sent by the UAC carries a high-quality VoLTE identifier and the 200OK message responded by the UAS is an acknowledgment message, the proxy server determines that a session update mode negotiated between the UAC and the UAS in the current call process is a custom mode in which a session update is performed by using an RTP data packet.
That is to say, during the session of establishing the VoLTE call, when the UAC determines to perform a call in a high-quality mode, the UAC generates an INVITE message carrying a high-quality VoLTE identifier and sends the INVITE message to the UAS, so as to notify the UAS of adopting a session update mode capable of improving the call quality; and after receiving the INVITE message, the UAS determines to adopt a session updating mode capable of improving the conversation quality according to the high-quality VoLTE identification extracted from the INVITE message, and then sends a confirmation message to the UAC. During the period, the proxy server determines that the UAC and the UAS adopt a session update mode capable of improving the call quality according to the INVITE message carrying the VoLTE identification and the confirmation message, so that the proxy server can detect the call state by detecting an RTP data packet.
Further, the INVITE message also carries information of the refresher.
Step S102: and if the session updating mode is determined to be a mode of updating the session by using an RTP (real-time transport protocol) data packet, the proxy server updates the VoLTE call state according to the RTP data packet interacted between the UAC and the UAS.
Step S102 includes: and after establishing the VoLTE call between the UAC and the UAS, the proxy server detects whether an RTP data packet interacted between the UAC and the UAS carries a session update message or not, and updates the VoLTE call state according to a detection result. Specifically, the session update message includes an update request message and an update response message, and if the proxy server detects that an RTP packet from the UAC or the UAS (i.e., the refresher) carries the update request message and an RTP packet responded by the other party carries the update response message, it is determined that the update of the VoLTE call state is successful.
That is, the UAC or the UAS generates an RTP packet carrying an update request message, transmits the RTP packet to the other party, and receives an RTP packet carrying an update response message and responded by the other party. Determining an initiator of an update request according to information of a refresher carried in an INVITE message, if the refresher is a UAC, generating an RTP data packet carrying the update request message by the UAC, sending the RTP data packet to the UAS, and receiving the RTP data packet carrying the update response message and responded by the UAS; if the refresher is UAS, the UAS generates an RTP data packet carrying an updating request message, sends the RTP data packet to the UAC, and receives the RTP data packet carrying an updating response message responded by the UAC. During the period, the proxy server detects an RTP data packet interacted between the UAC and the UAS, and if the proxy server detects the RTP data packet carrying the update request message and the corresponding RTP data packet carrying the update response message, the proxy server determines that the VoLTE call state is updated successfully.
It will be understood by those skilled in the art that all or part of the steps in the method according to the above embodiments may be implemented by a program, which may be stored in a computer-readable storage medium, and includes steps S101 to S102 when the program is executed. Further, the present invention may also provide a storage medium on which a computer program is stored, the program implementing at least steps S101 to S102 when executed by a processor. The storage medium may include ROM/RAM, magnetic disk, optical disk, and U disk.
The SIP user agent of the embodiment of the present invention may be divided into UAC and UAS. The UAC creates and sends SIP requests, and the UAS receives and processes the SIP requests and sends SIP responses. When the UAC initiates a call flow by sending an INVITE message, if a user sets a high-quality VoLTE call, an expansion field of the INVITE message informs a proxy server and a session UPDATE in the UAS call that a re-INVITE or UPDATE message is not used, but a self-defined method is used. Specifically, the UAS receives an INVITE call request (i.e., INVITE message) with high quality VoLTE call identity from the UAC, agrees to update the session using a predefined method, and then performs a response confirmation in a 200OK message. After receiving 200OK confirmation message with high-quality VoLTE call identifier, proxy server will start timer to periodically detect call RTP packet to detect call state. And when the call duration reaches half of the Session-Expires value, sending an update request according to whether the refresher defined in the Session-Expire header is UAC or UAS. If the refresher is UAS, the UAS packages the update information into an RTP packet and sends the RTP packet to a proxy server and a UAC; the proxy server detects that the RTP packet sent by the UAS carries the session updating information, then the proxy server waits for the session updating response RTP packet of the UAC, and if the proxy server receives the updating response RTP packet of the UAC, the session updating is successful. For some terminals or proxy servers which do not support the Session Timer mechanism, the Session management method provided by the embodiment of the invention can be used to realize the synchronization of the network and the terminal state, so that the network side can release resources in time according to the terminal state.
In the embodiment of the invention, a user can set whether to adopt a common quality VoLTE call or a high quality VoLTE call, when the user sets to adopt the common quality VoLTE call, the INVITE message sent by the UAC to the UAS does not carry a high quality VoLTE call identifier, at this time, the specific working flow is shown in figure 2, when the user sets to adopt the high quality VoLTE call, the INVITE message sent by the UAC to the UAS carries the high quality VoLTE call identifier, and at this time, the specific working flow is shown in figure 3.
Fig. 2 is a flowchart of the UAC establishing a call with the UAS and the general session management provided in the embodiment of the present invention, which is detailed as follows:
step 1: first, UAC sends INVITE message to UAS to request to establish call.
Wherein, the INVITE message carries a Session-Expire header, assuming the following values:
Session-Expires：300；
refresher＝uas。
step 2: and the UAS receives the ringing message, replies a 200OK message to the UAC after answering, and the UAC replies an ACK after receiving the 200OK, so that the VoLTE telephone is successfully established.
And step 3: when the call duration exceeds 2 minutes and 30 seconds, the UAS sends an UPDATE message to UPDATE the session state, wherein the UPDATE message carries the following parameters:
Session-Expires：300；
refresher＝uac。
and after receiving the UPDATE message, the UAC replies an ACK to indicate that the session is updated successfully.
And 4, step 4: when the call duration exceeds 2 minutes and 30 seconds again, the UAC sends an UPDATE message to UPDATE the session state, wherein the UPDATE message carries the following parameters:
Session-Expires：300；
refresher＝uas。
and after receiving the UPDATE message, the UAS replies an ACK to indicate that the session is updated successfully.
5. And subsequently, updating the session state every 2 minutes and 30 seconds, and sequentially executing the step 3 and the step 4.
Fig. 3 is a flowchart of session management for establishing a call between a UAC and a UAS and improving call quality according to an embodiment of the present invention, which is detailed as follows:
step 1: first, UAC sends INVITE message to UAS to request to establish call.
Wherein, the INVITE message carries a Session-Expire header, which is optional and assumed to be the following values:
Session-Expires：300；
refresher＝uas。
meanwhile, the parameters are carried to inform the network and the UAS that the session is updated by using a self-defined strategy, and the parameters can be carried in any extensible header, such as a User-Agent and the like.
Step 2: and the UAS receives the ringing message, judges that the UAC needs to use a self-defined session updating method through the INVITE message, replies 200OK to the UAC after the UAS answers, simultaneously informs the UAC of agreeing to use the self-defined session updating method, and replies ACK after the UAC receives the 200OK, at the moment, the UAS and the UAC successfully establish a conversation, and the session updating method is successfully negotiated.
Meanwhile, the proxy server also needs to detect the SIP message to obtain the update mode used by the call, so as to detect the call state.
And step 3: when the call duration exceeds 2 minutes and 30 seconds, the UAS adds a session update parameter to an upstream RTP message; and meanwhile, the proxy server starts a timer to detect whether the RTP message carries session updating parameters and response parameters, the UAC receives the RTP message of the UAS and detects that the RTP message carries the session updating parameters, so that a session updating response confirmation is also carried in the message sent to the UAS, and when the UAS receives the session updating confirmation response, the updating process is finished.
And 4, step 4: when the call duration exceeds 2 minutes and 30 seconds again, the session is updated by using the same method as the step 3.
Fig. 4 is a block diagram of a communication device according to an embodiment of the present invention, as shown in fig. 4, including: an update mode negotiation module 10 and a call state update module 20.
An update mode negotiation module 10, configured to determine a session update mode of a voice over long term evolution (VoLTE) call of the present time negotiated by a user agent client UAC and a user agent server UAS;
and the call state updating module 20 is configured to, if it is determined that the session is updated by using an RTP packet of a real-time transport protocol, perform VoLTE call state updating by the proxy server according to the RTP packet interacted between the UAC and the UAS.
The working process of the device comprises the following steps: the update mode negotiation module 10 determines that the session update mode negotiated between the UAC and the UAS in the current call process is a mode of performing session update using an RTP data packet according to SIP messages (including INVITE messages and 200OK messages) interacted between the UAC and the UAS during establishing a VoLTE call, that is, when an INVITE message sent by the UAC carries a high-quality VoLTE identifier and a 200OK message responded by the UAS is an acknowledgment message. After the VoLTE call is established between the UAC and the UAS, the call state update module 20 detects whether an RTP packet exchanged between the UAC and the UAS carries a session update message (including an update request message and an update response message), that is, it detects that an RTP packet from the UAC or the UAS carries an update request message and an RTP packet responded by an opposite party carries an update response message, and then determines that the VoLTE call state is successfully updated this time.
The embodiment provides a VoLTE calling device, including:
the processor is used for determining a session updating mode of the VoLTE call negotiated by the UAC and the UAS, and if the session updating mode is determined to be a mode of updating the session by using an RTP (real-time transport protocol) data packet, the proxy server updates the VoLTE call state according to the RTP data packet interacted between the UAC and the UAS;
a memory coupled to the processor on which is stored a program for execution by the processor.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the embodiment of the invention embeds the re-INVITE or UPDATE request message periodically sent by the user agent in the existing Session Timer mechanism into the RTP data packet for interactive updating, does not increase extra control signaling updating conversation in the conversation process, avoids call drop caused by delayed re-INVITE or UPDATE response, and improves the VoLTE conversation quality.
Although the present invention has been described in detail hereinabove, the present invention is not limited thereto, and various modifications can be made by those skilled in the art in light of the principle of the present invention. Thus, modifications made in accordance with the principles of the present invention should be understood to fall within the scope of the present invention.

Claims (10)

1. A method of telephony, comprising:
the proxy server determines a session updating mode of the long term evolution voice scheme VoLTE call negotiated by a user agent client UAC and a user agent server UAS;
and if the session updating mode is determined to be a mode of updating the session by using an RTP (real-time transport protocol) data packet, the proxy server updates the VoLTE call state according to the RTP data packet interacted between the UAC and the UAS.
2. The method as claimed in claim 1, wherein the determining, by the proxy server, the session update mode of the VoLTE call negotiated by the UAC and the UAS includes:
and the proxy server determines a session updating mode of the VoLTE call negotiated by the UAC and the UAS according to a Session Initiation Protocol (SIP) message interacted between the UAC and the UAS during the VoLTE call establishment.
3. The method of claim 2, wherein the SIP message includes an INVITE message and a 200OK message, and the determining, by the proxy server, a session update mode of the VoLTE call negotiated by the UAC and the UAS according to the SIP message interacted between the UAC and the UAS during the setup of the VoLTE call comprises:
and if the INVITE message sent by the UAC carries a high-quality VoLTE identifier and the 200OK message responded by the UAS is an acknowledgement message, the proxy server determines that the session updating mode negotiated by the UAC and the UAS in the call process is a self-defined mode for updating the session by using an RTP (real-time transport protocol) data packet.
4. The method of claim 3, wherein if the session update is determined to be performed by using an RTP packet, the performing, by the proxy server, VoLTE session status update according to the RTP packet interacted between the UAC and the UAS includes:
and after establishing the VoLTE call between the UAC and the UAS, the proxy server detects whether an RTP data packet interacted between the UAC and the UAS carries a session update message or not, and updates the VoLTE call state according to a detection result.
5. The method of claim 4, wherein the performing VoLTE call state update according to the detection result comprises:
the proxy server starts a timer when detecting that a session updating parameter is carried in an RTP data packet sent to the UAC by the UAS, and if detecting that a session updating response confirmation is carried in the RTP data packet sent to the UAS by the UAC within the timing time of the timer, the proxy server determines that the VoLTE call state is updated successfully; alternatively, the first and second electrodes may be,
and the proxy server starts a timer when detecting that the RTP data packet sent to the UAS by the UAC carries a session updating parameter, and if detecting that the RTP data packet sent to the UAC by the UAS carries a session updating response confirmation within the timing time of the timer, the proxy server determines that the VoLTE call state is updated successfully.
6. A telephony device, comprising:
the updating mode negotiation module is used for determining a session updating mode of the VoLTE call of the long-term evolution voice scheme negotiated by the user agent client UAC and the user agent server UAS;
and the call state updating module is used for updating the VoLTE call state by the proxy server according to the RTP data packet interacted between the UAC and the UAS if the mode of session updating by using the RTP data packet is determined.
7. The apparatus of claim 6, wherein the update mode negotiation module determines a session update mode of the VoLTE call negotiated by the UAC and the UAS according to a Session Initiation Protocol (SIP) message interacted between the UAC and the UAS during the VoLTE call setup.
8. The apparatus of claim 7, wherein the SIP message includes an INVITE message and a 200OK message, and the update mode negotiation module determines that a session update mode negotiated between the UAC and the UAS in the current session is a mode of performing session update using an RTP packet when the INVITE message sent by the UAC carries a high quality VoLTE identity and the 200OK message responded by the UAS is an acknowledgement message.
9. The apparatus according to claim 8, wherein the call state update module detects whether an RTP packet exchanged between the UAC and the UAS carries a session update message after establishing the VoLTE call between the UAC and the UAS, and updates the VoLTE call state according to a detection result.
10. The apparatus according to claim 9, wherein the session state update module starts a timer when detecting that a RTP packet sent by the UAS to the UAC carries a session update parameter, and determines that the VoLTE session state update is successful if detecting that a RTP packet sent by the UAC to the UAS carries a session update response acknowledgement within a timing time of the timer; or starting a timer when detecting that the session update parameters are carried in the RTP data packet sent to the UAS by the UAC, and if detecting that the session update response confirmation is carried in the RTP data packet sent to the UAC by the UAS within the timing time of the timer, determining that the VoLTE call state update is successful by the proxy server.
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