CN108521400B - Codec self-adaptive method for delayed backoff - Google Patents
Codec self-adaptive method for delayed backoff Download PDFInfo
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- CN108521400B CN108521400B CN201810179254.2A CN201810179254A CN108521400B CN 108521400 B CN108521400 B CN 108521400B CN 201810179254 A CN201810179254 A CN 201810179254A CN 108521400 B CN108521400 B CN 108521400B
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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
- H04L65/60—Network streaming of media packets
- H04L65/65—Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]
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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
- H04L65/60—Network streaming of media packets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M7/00—Arrangements for interconnection between switching centres
- H04M7/006—Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer
- H04M7/0072—Speech codec negotiation
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- Computer Networks & Wireless Communication (AREA)
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- Data Exchanges In Wide-Area Networks (AREA)
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Abstract
The invention relates to a codec self-adapting method of delayed backoff, when detecting codec conflict, a local end VoIP device randomly backs off for a period of time, and the VoIP device at one end with short back-off time is switched with the codec of the VoIP device at the other end, so that the codec is consistent with the codec of the VoIP device at the other end, thereby avoiding ping-pong effect between the two VoIP devices and ensuring normal communication.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a codec self-adaption method for delaying back-off.
Background
Voip (voice over Internet protocol), which is a network telephone. The VoIP device is a bidirectional device, comprises two processes of encoding and decoding, and the encoding and decoding word in the VoIP industry is often written as codec. When establishing a call, the VoIP device implements negotiation of the codec through a signaling protocol such as SIP or H323, so as to ensure that both parties use the same codec. However, the codecs used by the two parties may be inconsistent due to various reasons, or one party suddenly changes the codec during the call, so that single-pass or even silence occurs, and normal use of the device is affected.
Aiming at various problems occurring when codecs of two parties are inconsistent (hereinafter referred to as conflict), a codec self-adaption strategy is provided, namely when the fact that the codec of an opposite terminal is different from the local is detected, the local codec is adjusted to be consistent with the opposite terminal.
Codec adaptation is often turned on for VoIP devices, usually to ensure device adaptation, which may occur when both parties to a call are on codec adaptation. The original codec self-adaptive strategy is that once the device detects a conflict, the codec is switched immediately, so that two sides can repeatedly adapt to the codec of the opposite side to generate a ping-pong effect, and the device can not normally talk.
Disclosure of Invention
The invention aims to provide a codec self-adaptive method for delaying back-off, which can avoid ping-pong effect of VoIP equipment and ensure normal conversation of the VoIP equipment.
In order to achieve the purpose, the invention adopts the technical scheme that:
a codec adaptation method of delayed backoff, the adaptation method comprising the steps of:
the local end VoIP equipment receives an RTP packet sent by opposite end VoIP equipment, detects a ptype field in the RTP packet, judges whether the ptype field is consistent with the ptype field in a PRT packet currently sent by the local end VoIP equipment, and generates codec conflict with the opposite end VoIP equipment when the ptype field is inconsistent;
step 2, carrying out delayed backoff;
when detecting the codec conflict, the local terminal VoIP device retreats for a period of time, the time is the retreat time, waits for the opposite terminal VoIP device to carry out codec self-adaptation, and adjusts the coding mode of the opposite terminal VoIP device to enable the coding mode of the opposite terminal VoIP device to be consistent with the coding of the local terminal VoIP device; if the opposite end VoIP device does not adapt after the back-off time is exceeded, the local end VOIP device carries out codec adaptation.
The back-off time is a system setting time.
The back-off time is D = m × ptime, wherein ptime is RTP packet sending interval, and m is 0-2n1, n is the adaptation times of the local end VoIP device in one call.
When detecting the codec conflict, the invention randomly backs off one end of time by the local end VoIP equipment, and enables the party with short back-off time to execute the self-adapting process, thereby ensuring the codec of the VoIP equipment of both parties to be consistent, avoiding the ping-pong effect between the two VoIP equipment and ensuring the normal communication.
In addition, the invention sets the back-off time to be a random value, namely D = m × ptime, wherein the value range of m can exponentially rise along with the increase of the adaptation times of the VoIP equipment, so that the back-off time can be rapidly staggered between the two parties, and the adaptability of the two parties is improved.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
fig. 2 is a schematic diagram of a second embodiment of the present invention.
Detailed Description
As shown in fig. 1, the present invention discloses a codec adaptive method for delayed backoff, which comprises the following steps:
the communication of the VoIP equipment conforms to the RFC3550 specification, multimedia data is transmitted through an RTP protocol, and ptype fields of RTP headers have mapping relation with different codecs, so that the communication is realized by detecting the ptype fields of RTP packets at an opposite end only when the packets are received, and judging whether the packets are consistent with the packets currently sent or not, if the packets are inconsistent, the opposite end changes the codec, and thus, the codec conflict detection is realized.
Step 2, carrying out delayed backoff;
when collision is detected, the codec is not switched immediately, but is backed off for a period of time, so that if the opposite end supports codec adaptation, the opposite end can actively adapt. If the opposite terminal does not support the self-adaptation, the self-adaptation is carried out by the local terminal equipment after the back-off time is reached, so that the two sides keep the unified codec.
DUTs and M in fig. 1 refer to VoIP devices used in development, and the DUTs and M are only differences in roles, that is, they respectively represent a home VoIP phone and an opposite VoIP phone; PCMU and PCMA are encoded RTP streams produced by codec. Whereas the DUTs, M, PCMU and PCMA in fig. 2 have the same meaning as fig. 1.
The period of time is the back-off time, which is the time set by the system. When the back-off times are not consistent, the problem of ping-pong effect generated when the VoIP devices conflict can be solved by adopting the self-adaptive method, but if the back-off times of the two devices are completely consistent (if the same device is used), the effect is the same as that when the back-off time is not adopted.
Therefore, as shown in fig. 2, the present invention proposes a random-delay dynamic avoidance strategy based on the above-mentioned embodiment, that is, the back-off time is random, and the random value range is expanded with the increase of the adaptation times, so that the back-off times of both sides can be staggered as much as possible, and a more suitable adaptation speed can be provided.
If the adaptation frequency of the VoIP equipment in one-way call is n, the adaptation frequency is 0-2nAnd 1, selecting a random number m, so that the back-off time is D = m × ptime, and ptime is the RTP packet sending interval defined in RFC 3550.
Therefore, the method can adapt immediately when the conflict is detected for the first time, and can have higher adaptation speed when the codec adaptation is not started at the opposite end. And along with the increase of the adaptation times, the range of the random value rises exponentially, so that the backoff time can be quickly staggered between the two parties.
The above description is only exemplary of the present invention and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above exemplary embodiments according to the technical spirit of the present invention are within the technical scope of the present invention.
Claims (3)
1. A codec adaptive method of delayed backoff is characterized in that: the adaptive method comprises the following steps:
step 1, codec conflict detection is carried out;
the local end VoIP equipment receives an RTP packet sent by opposite end VoIP equipment, detects a ptype field in the RTP packet, judges whether the ptype field is consistent with the ptype field in the RTP packet currently sent by the local end VoIP equipment, and generates codec conflict with the opposite end VoIP equipment when the ptype field is inconsistent;
step 2, carrying out delayed backoff;
when detecting the codec conflict, the local terminal VoIP device retreats for a period of time, the time is the retreat time, waits for the opposite terminal VoIP device to carry out codec self-adaptation, and adjusts the coding mode of the opposite terminal VoIP device to enable the coding mode of the opposite terminal VoIP device to be consistent with the coding of the local terminal VoIP device; if the opposite end VoIP device does not adapt after the back-off time is exceeded, the local end VOIP device carries out codec adaptation.
2. The codec adaptation method for delayed backoff according to claim 1, wherein: the back-off time is a system setting time.
3. The codec adaptation method for delayed backoff according to claim 1, wherein: the back-off time is D = m × ptime, wherein ptime is RTP packet sending interval, and m is 0-2n1, n is the adaptation times of the local end VoIP device in one call.
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| CN201810179254.2A CN108521400B (en) | 2018-03-05 | 2018-03-05 | Codec self-adaptive method for delayed backoff |
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| CN201810179254.2A CN108521400B (en) | 2018-03-05 | 2018-03-05 | Codec self-adaptive method for delayed backoff |
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| CN108521400A CN108521400A (en) | 2018-09-11 |
| CN108521400B true CN108521400B (en) | 2020-09-22 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010117326A1 (en) * | 2009-04-07 | 2010-10-14 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and arrangement for session negotiation |
| CN102739605A (en) * | 2011-03-31 | 2012-10-17 | 华为技术有限公司 | Method and device for improving speech communication |
| CN107404363A (en) * | 2016-05-18 | 2017-11-28 | 中国移动通信有限公司研究院 | A kind of method of adjustment, system, terminal and the network side equipment of voice code check |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8593999B2 (en) * | 2008-03-06 | 2013-11-26 | Shoretel, Inc. | Bandwidth management and codec negotiation based on WAN topology |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010117326A1 (en) * | 2009-04-07 | 2010-10-14 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and arrangement for session negotiation |
| CN102739605A (en) * | 2011-03-31 | 2012-10-17 | 华为技术有限公司 | Method and device for improving speech communication |
| CN107404363A (en) * | 2016-05-18 | 2017-11-28 | 中国移动通信有限公司研究院 | A kind of method of adjustment, system, terminal and the network side equipment of voice code check |
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| CN108521400A (en) | 2018-09-11 |
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