CN100379229C - Method of receivel/send end ability selection - Google Patents
Method of receivel/send end ability selection Download PDFInfo
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- CN100379229C CN100379229C CNB021260559A CN02126055A CN100379229C CN 100379229 C CN100379229 C CN 100379229C CN B021260559 A CNB021260559 A CN B021260559A CN 02126055 A CN02126055 A CN 02126055A CN 100379229 C CN100379229 C CN 100379229C
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- Prior art keywords
- ability
- capability
- opposite end
- local terminal
- transmitting capacity
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Abstract
The present invention discloses a method for selecting the capability of a receiving-sending end, which at least comprises the steps that a system receives information of a capability set of an opposite end, and the receiving capability of the opposite end can be read from the information; the system compares the sending capability of the end with the receiving capability of the opposite end, the sending capability of the end is selected from an intersection of the capability sets of the end and the opposite end according to a principal of optimized calling capability. The present invention is completely suitable for the system which does not support the asymmetric capability, before a logical channel is opened, and the selection to the final capability is completed so as to avoid the operation to repeatedly close and open the channel, and not to influence the stability of the system.
Description
Technical field
The present invention relates to the method that receivel/send end ability is selected between Communication Gateway.
Background technology
If terminal can be encoded and be sent or receive the decode specific signal, just say that it has specific ability.The process of capabilities exchange will guarantee that the multi-media signal of transmission can be received and can obtain respective handling.This just requires the ability that receives the decode of each terminal should be by known to another terminal.The whole reception of terminal and will be by transfer capability collection notice other-end to the decoding capability of unlike signal.
Receiving ability has represented that terminal receives and handle the ability of input stream.Transmitter will limit the content that they transmit information, to guarantee to meet the receiving ability that receiver is pointed out.If do not have receiving ability this show that terminal can not receive (just a conveyer).
Transmitting capacity is represented the ability of terminal transmits information stream.Transmitting capacity is used to issue the selection of a possible operator scheme of receiver.Receiver can require it to be ready the pattern that receives like this.If do not have transmitting capacity this show that terminal does not provide the preoption (but it still can be sent within the receiver limit of power anything) of a pattern to receiver.
Receiving ability is described the ability that terminal received and handled inlet flow.The information that the sender must limit their transmissions is that the recipient indicates and can receive.The shortage of receiving ability shows that terminal can not receive.Transmittability is described the ability of terminal transmission information flow.The transmittability recipient is selected a possible operator scheme, the pattern that makes the recipient can ask it more to be ready.The shortage indicating terminal of transmittability can not provide this selection to the recipient.
Sending terminal composes each independent terminal capability to capability list, for example: audio G.723.1, G.728 audio and CIF H.263 video can give branch other numeral.These ability numerals are formed optional capability set structure.Each structure indicating terminal can be carried out a kind of pattern of listing in this collection.For example: G.728} an optional capability set tabulation for { G.711, G.723.1, to represent the terminal support and only to support this several audio modes.
These optional capability set structures are formed capability set structure simultaneously, the pattern that each this structure indicates a series of terminals to support simultaneously.For example: one simultaneously the capability set structure comprise two optional capability set structures { H.261, H.263} and { G.711, G.723.1, represent that G.728} this terminal can carry out the encoding and decoding of Voice ﹠ Video simultaneously.{ { H.261}, { H.261, H.263}, { G.711, G.723.1, represent that G.728}} this terminal can handle two video channels and a voice-grade channel simultaneously.H.261 one of them video channel is, another video channel is H.261 or H.263, G.711 a voice-grade channel is, G.723.1, or G.728.
Logical channel refers to the unidirectional or two-way approach of the information of transmitting.The logical channel signaling procedure has defined the logical channel that how to open and close audio image and data.The purpose of these processes is can receive data and these data are decoded after logical channel is opened for a terminal, rather than once there being transfer of data to go to receive; This also is in order to guarantee that receiving terminal can be ready to receive data and they are decoded before the transmission beginning.
Ability selects to have following mode in the prior art:
One, the other side's priority principle (Netmeeting adopts this principle).A side (no matter being as calling party or callee) who calls out is after receiving the capability set that the other side sends (showing the ability that the other side can receive), transmitting capacity of oneself and the other side's receiving ability are got common factor, in common factor, select that the highest ability of the other side's priority as transmitting capacity.
Two, local terminal priority principle (the cisco gateway adopts this principle).A side (no matter being as calling party or callee) who calls out is after receiving the capability set that the other side sends (showing the ability that the other side can receive), transmitting capacity of oneself and the other side's receiving ability are got common factor, in common factor, select that the highest ability of own priority as transmitting capacity, and open transmitting channel with this ability.Behind the capability negotiation, be different abilities, the transmitting channel of oneself closed if find to receive and send what use, and according to the identical ability of receiving ability as transmitting capacity, reopen transmitting channel.
Agreement has stipulated that how both sides send to the opposite end with the receiving ability collection of oneself, in this capability set scope, select a transmitting capacity by the opposite end, but this mode thinks that two logic channels can use different abilities, so both sides do not inform the other side with selection result after having selected the transmitting capacity of oneself.And in actual conditions, because the hardware constraints of communication apparatus requires two logical channels to use identical abilities, and according to the agreement regulation, the ability that might occur is asymmetric, if audio frequency, phenomenon that can't hear sound behind the phone at this moment will occur connecting.This just needs appropriate ability selection strategy, guarantees that both sides use identical ability to send information flow.
The other side's priority principle only is used in the equipment that can adapt to the asymmetric capability channel, if side's incompatibility asymmetric capability is arranged in the communication two party, this side will occur can't be correctly decoded, and the result is information flow correctly " recovery ", such as can't hear sound.
Though the local terminal priority principle provides the solution of this problem, complicated pathway closure, opening operation are brought other negative effect easily.
Summary of the invention
At the shortcoming of prior art, the method that the object of the present invention is to provide a kind of receivel/send end ability to select, after guaranteeing capability negotiation, communication two party gateway a kind of ability of reaching an agreement on out is carried out communication.
Method of the present invention comprises step at least:
A, system receive the capability set message of opposite end, read the opposite end receiving ability from this message;
B, system compare the transmitting capacity of local terminal and the receiving ability of opposite end, by the preferred caller ability principle, select the transmitting capacity of local terminal from the common factor of local terminal and opposite end capability set.
According to above-mentioned method:
The ability configuration feature that the reception of system and transmitting capacity provide by system, pre-configured by the user.
Described preferential caller ability principle is: local terminal is caller, then selects the transmitting capacity of the ability of local terminal limit priority as local terminal from described common factor; Local terminal is called, then selects the transmitting capacity of the ability of opposite end limit priority as local terminal from described common factor.
The priority of ability is pre-determined by the user by the ability configuration feature that system provides.
Steps A also comprises the receiving ability of storing the opposite end, uses for setting up logic channel.
The preferential ability selection strategy of caller is applicable to the system that does not support asymmetric capability fully, and before logic channel is opened, has finished the selected of final ability, has avoided the operation of closing repeatedly, opening to channel, does not influence the stability of system.
Embodiment
Communication between two H323 gateways, in order to guarantee that transmitting-receiving two-end adopts appropriate ability to carry out the transmission of information flow, the decoding of the corresponding receiving end of the coding of making a start, that is: Media Stream is after adopting certain code decode algorithm to compress, send to the purpose gateway, the purpose gateway adopts the code decode algorithm corresponding with it to decompress, and reverts to original information flow.In theory, same gateway sends and receiving media stream, can use different encoding and decoding; But in actual conditions, because objective factor such as hardware limitation, require same gateway to use with a kind of code decode algorithm stream that sends and receives information.
To method of the present invention, comprise step:
1, system's providing capability configuration feature, the user can determine the reception and the transmitting capacity of current system, and can specify the priority of these abilities by configuration, with the sequencing of determining to select.
2, in the capabilities exchange stage, system receives the capability set message of opposite end, the opposite end receiving ability correctly can be read from this message, and by certain storage means these abilities be stored.
3, system compares the transmitting capacity of local terminal and the receiving ability of opposite end, therefrom selects the transmitting capacity (receiving ability of opposite end) of local terminal.For preventing when system's selective power, to carry out according to following principle owing to hardware is not supported the phenomenon that can not correctly carry out encoding and decoding to information flow that asymmetric capability (two channel uses different abilities) produces:
Preferred caller ability principle---local terminal is caller: local terminal transmitting capacity and opposite end receiving ability are compared, select in the common factor of these two capability sets, the ability of local terminal limit priority is as transmitting capacity; Local terminal is called: opposite end receiving ability and local terminal transmitting capacity are compared, select in the common factor of these two capability sets, the ability of opposite end limit priority is as transmitting capacity.
For example: two terminal A and B, the reception and the transmitting capacity of the last configuration of A are followed successively by according to priority orders: G.723.1, G.729; The reception and the transmitting capacity of the last configuration of B are followed successively by according to priority orders: G.711, G.729, G.723.1.In call, A is as caller, and B is as called.A has received the receiving ability collection of B, gets with the transmitting capacity collection of oneself and occurs simultaneously: G.723.1, G.729}, and local terminal is caller, the priority higher ability of therefore selecting oneself---and G.723.1; B has received the receiving ability collection of A, gets with the transmitting capacity collection of oneself and occurs simultaneously: G.729, G.723.1}, and local terminal is called, therefore selects opposite end priority higher ability---and G.723.1.
Like this, finish capability negotiation after, just use with a kind of ability at two ends---G.723.1 carried out the encoding and decoding of Media Stream.
Claims (4)
1. the method selected of a receivel/send end ability is characterized in that comprising at least step:
A, system receive the capability set message of opposite end, read the opposite end receiving ability from this message;
B, system compare the transmitting capacity of local terminal and the receiving ability of opposite end, by the preferred caller ability principle, from the common factor of local terminal and opposite end capability set, select the transmitting capacity of local terminal, when local terminal is caller, from described common factor, select the transmitting capacity of the ability of local terminal limit priority as local terminal; When local terminal is called, from described common factor, select the transmitting capacity of the ability of opposite end limit priority as local terminal.
2. the method for claim 1 is characterized in that the reception of system and the ability configuration feature that transmitting capacity provides by system, and is pre-configured by the user.
3. the method for claim 1, the priority that it is characterized in that ability is pre-determined by the user by the ability configuration feature that system provides.
4. the method for claim 1 is characterized in that steps A also comprises the receiving ability of storing the opposite end, uses for setting up logic channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021260559A CN100379229C (en) | 2002-08-12 | 2002-08-12 | Method of receivel/send end ability selection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021260559A CN100379229C (en) | 2002-08-12 | 2002-08-12 | Method of receivel/send end ability selection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1476209A CN1476209A (en) | 2004-02-18 |
| CN100379229C true CN100379229C (en) | 2008-04-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021260559A Expired - Fee Related CN100379229C (en) | 2002-08-12 | 2002-08-12 | Method of receivel/send end ability selection |
Country Status (1)
| Country | Link |
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| CN (1) | CN100379229C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1859403B (en) * | 2006-02-09 | 2010-05-12 | 华为技术有限公司 | Method for ability consulting in customer end/server mode service system |
| KR100801002B1 (en) * | 2006-06-05 | 2008-02-11 | 삼성전자주식회사 | Method for transferring/playing multimedia data on wireless network and wireless device thereof |
| US8149843B2 (en) * | 2006-06-28 | 2012-04-03 | Cisco Technology, Inc. | Capability exchange between network entities in WiMAX |
| CN104219485B (en) * | 2013-06-01 | 2019-07-23 | 中兴通讯股份有限公司 | The long-range ability exchange method and device that endpoint is presented |
| CN104219487B (en) * | 2013-06-01 | 2019-05-07 | 中兴通讯股份有限公司 | The long-range ability exchange method and device, data flow that endpoint is presented |
| CN105100018A (en) * | 2014-05-16 | 2015-11-25 | 阿尔卡特朗讯 | Method, apparatus and system used for determining PAEC mode |
| CN105744209B (en) * | 2014-12-12 | 2019-01-25 | 中兴通讯股份有限公司 | The transmission method and device of media data flow |
| CN108781217B (en) * | 2017-01-16 | 2020-11-27 | 华为技术有限公司 | Multimedia data transmission method, server and terminal |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1075235A (en) * | 1992-02-06 | 1993-08-11 | 莫托罗拉公司 | The wireless telephone plant of duplex system and method |
| US5590397A (en) * | 1993-12-17 | 1996-12-31 | Nec Corporation | Selecting and prioritizing radio telephone systems at radio terminal |
| CN1316834A (en) * | 2000-04-05 | 2001-10-10 | 阿尔卡塔尔公司 | Radio communication system and unit used for radio communication method |
-
2002
- 2002-08-12 CN CNB021260559A patent/CN100379229C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1075235A (en) * | 1992-02-06 | 1993-08-11 | 莫托罗拉公司 | The wireless telephone plant of duplex system and method |
| US5590397A (en) * | 1993-12-17 | 1996-12-31 | Nec Corporation | Selecting and prioritizing radio telephone systems at radio terminal |
| CN1316834A (en) * | 2000-04-05 | 2001-10-10 | 阿尔卡塔尔公司 | Radio communication system and unit used for radio communication method |
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| Publication number | Publication date |
|---|---|
| CN1476209A (en) | 2004-02-18 |
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