CN101489085B - Method and apparatus for enhancing interoperability of visual telephone - Google Patents
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Abstract
The invention discloses a method for increasing a videophone intercommunication comprising: receiving data transmitted from a communication node; parsing a fixed filling code stream carried by the data of the communication node as a reversible code of the fixed filling code stream for this end, and obtaining an analytical result; performing a reversible code conversion to the data transmitted by the communication node according to the analytical result. The invention also discloses a device for increasing the videophone intercommunication. The invention can improve the videophone intercommunication when the both communication sides use different bit stream coding sequences.
Description
Technical field
The present invention relates to the video telephone field, particularly a kind of method and apparatus that strengthens interoperability of visual telephone.
Background technology
Video telephone is as 3G (Third Generation) Moblie (3G, 3
RdGeneration) principal character of mobile phone more and more is subjected to user's favor with its multimedia feature, increasingly mature along with 3G network, and various mobile telephone terminal manufacturer all supports the product of video telephone in research and development.
Because video telephone is a kind of emerging application, the protocol layer that relates to communications portion is also perfect in continuous development, for solving the problem of video telephone intercommunication, revise by the integrated numerous communication protocols of the 3GPP of international organization, worked out multiple agreement 3G-324M, it mainly comprises: H.324, H.245 and H.223, various piece is responsible for finishing specific function.Fig. 1 is the configuration diagram of video telephone in the prior art, by H.324, H.223 and the part of H.245 forming be the 3G-324M protocol layer.Based on framework shown in Figure 1, pass through the 3G network mechanical floor and the device drives adaptation layer of receiving terminal from the data of transmitting terminal, arrive the H.223 layer of receiving terminal, H.223 separate multiple agreement and the data that receive are separated data is sent to the upper strata after the Combined Processing and finish subsequent treatment, the network equipment of the common indication of above-mentioned 3G network mechanical floor is exactly modulator-demodulator (Modem).The formulation of 3G-324M agreement provides standard for the video telephone product of each mobile telephone terminal manufacturers produce carries out intercommunication.
In video telephony applications, different Modem may produce different bit element flow coded sequences with the data of agreement provider subtend Correspondent Node transmission, for example suppose to be expressed as 0xCD (binary form is shown 11001101) to the data that the opposite end sends, different Modem and agreement provider are when Correspondent Node sends these data, can be according to two kinds of bit element flow coded sequences, wherein first kind is exactly to send according to 0xCD, another kind is exactly the inversion code according to 0xCD, and promptly 0xB3 (binary form is shown 10110011) sends.In present video telephone communication, regulation according to the 3G-324M protocol layer, directly separate Combined Processing after receiving the data that Correspondent Node sends, this separates Combined Processing is to carry out according to the bit element flow coded sequence with local terminal Modem or the employing of agreement provider, therefore when communicating pair Modem or agreement provider when adopting different bit element flow coded sequences respectively separately, when separating Combined Processing according to the bit element flow coded sequence identical with local terminal Modem or agreement provider, can't obtain correct result, this will cause the failure of calling out, and present 3G-324M agreement is not included the settling mode of the problems referred to above in the agreement regulation.
As seen, the video telephone intercommunication difficult problem that causes at the Correspondent Node different bit element flow coded sequence of employing in the prior art lacks corresponding solution.
Summary of the invention
The invention provides a kind of method that strengthens interoperability of visual telephone, this method can improve the interoperability of video telephone when communicating pair uses different bit element flow coded sequences.
The invention provides a kind of device that strengthens interoperability of visual telephone, this device can improve the interoperability of video telephone when communicating pair uses different bit element flow coded sequences.
Technical scheme of the present invention is achieved in that
A kind of method that strengthens interoperability of visual telephone, this method comprises:
The data that the received communication opposite end sends;
The fixedly filling code stream of resolving the data carry of described Correspondent Node transmission is the inversion code of the fixedly filling code stream of local terminal employing, draws analysis result;
According to described analysis result, the data that described Correspondent Node sends are carried out the inversion code conversion.
Preferably, the fixedly filling code stream of the data carry that described parsing Correspondent Node sends is before the inversion code of the fixedly filling code stream that adopts of local terminal, further comprise: whether the fixedly filling code stream of judging the data carry that described Correspondent Node sends is identical with the fixedly filling code stream of local terminal employing, if, directly the data that described Correspondent Node is sent are carried out the demultiplexing processing, otherwise, continue to carry out fixedly filling code stream that described resolution data carries and be the step of the inversion code of the fixedly filling code stream that local terminal adopts.
Whether preferably, the data that described received communication opposite end sends: intercepting has data to arrive in the local terminal modulator-demodulator if being, if do not have, continue to keep intercepting state, if having, then receives the data that arrive.
Preferably, the described data that Correspondent Node is sent carry out further comprising after the inversion code conversion: will carry out the inversion code conversion to the data that described Correspondent Node sends.
Preferably, set in advance the code stream transition matrix, this code stream transition matrix comprises: the mapping relations of data to be converted and inversion code transformation result; The described data that Correspondent Node is sent are carried out inversion code and are converted to: call described code stream transition matrix, according to described mapping relations, search the inversion code transformation result of the data correspondence of Correspondent Node transmission; Describedly will carry out inversion code to the data that Correspondent Node sends and be converted to: call described code stream transition matrix,, search the inversion code transformation result of the data correspondence that sends to Correspondent Node according to described mapping relations.
A kind of device that strengthens interoperability of visual telephone, this device comprises:
Receiver module is used for the data that the received communication opposite end sends;
Parsing module, the fixedly filling code stream that is used to resolve the data carry that described Correspondent Node sends are the inversion code of the fixedly filling code stream that adopts of local terminal, draw analysis result;
First modular converter is used for the analysis result that draws according to described parsing module, and the data that described Correspondent Node sends are carried out the inversion code conversion.
Preferably, described parsing module comprises:
Judging unit is used to judge that the fixedly filling code stream of the data carry that described Correspondent Node sends is whether identical with the fixedly filling code stream that local terminal adopts, and draws judged result;
Resolution executing, be used for the judged result that draws according to described judging unit, if the fixedly filling code stream of the data carry that described Correspondent Node sends is identical with the fixedly filling code stream that local terminal adopts, draws the data that directly described Correspondent Node sent and carry out the analysis result that demultiplexing is handled; If the fixedly filling code stream of the data carry that described Correspondent Node sends is inequality with the fixedly filling code stream that local terminal adopts, the fixedly filling code stream that draws the data carry that described Correspondent Node sends is the analysis result of inversion code of the fixedly filling code stream of local terminal employing.
Preferably, described receiver module comprises:
Intercepting the unit, whether have data arrive, keep the state of intercepting when not having data to arrive if being used to intercept the local terminal modulator-demodulator;
Receive performance element, be used for listening to the local terminal modulator-demodulator when having data to arrive, receive the data that arrive in the described unit of intercepting.
Preferably, further comprise second modular converter in this device, be used for the analysis result that draws according to described parsing module, will carry out the inversion code conversion to the data that Correspondent Node sends.
Preferably, further comprise memory module in this device, be used to store the code stream transition matrix that sets in advance, this code stream transition matrix comprises: the mapping relations of data to be converted and inversion code transformation result;
The data that described first modular converter sends Correspondent Node are carried out the inversion code conversion, are by calling described code stream transition matrix, and the inversion code transformation result of the data correspondence that sends according to described mapping relationship searching Correspondent Node realizes;
Described second modular converter will carry out inversion code conversion to the data that Correspondent Node sends, and be by calling described code stream transition matrix, according to described mapping relations, search that the inversion code transformation result of the data correspondence that sends to Correspondent Node realizes.
As seen, the present invention strengthens the method and apparatus of interoperability of visual telephone, when the fixedly filling code stream of resolving the data carry that Correspondent Node sends is the inversion code of the fixedly filling code stream that adopts of local terminal, the data that described Correspondent Node sends are carried out the inversion code conversion operations, the bit element flow coded sequence that data fit local terminal after the conversion adopts, since follow-up separate Combined Processing at be the data that adopt local terminal bit element flow coded sequence, so can access correct result, thereby adopt at communicating pair under the situation of different bit element flow coded sequences, strengthened the interoperability of video telephone.
Description of drawings
Fig. 1 is the configuration diagram of video telephone in the prior art;
Fig. 2 is the fixedly filler code flow diagram of the H.223 compound rank two of the present invention;
Fig. 3 strengthens the method flow diagram of interoperability of visual telephone for the present invention;
Fig. 4 strengthens for the present invention in the method for interoperability of visual telephone, the configuration diagram of video telephone;
Fig. 5 strengthens for the present invention in the method for interoperability of visual telephone, the schematic diagram of code stream transition matrix;
Fig. 6 strengthens the embodiment flow chart of the method for interoperability of visual telephone for the present invention;
Fig. 7 strengthens the apparatus structure schematic diagram of interoperability of visual telephone for the present invention.
Embodiment
For making objects and advantages of the present invention clearer, the present invention is further detailed explanation below in conjunction with drawings and Examples.
At first, introduce the method that the present invention strengthens interoperability of visual telephone.
Before introducing the method idiographic flow that the present invention strengthens interoperability of visual telephone, earlier the agreement layer standard characteristics of the video telephone 3G-324M agreement that needs in this method to use are carried out simplified summary.
The communicating pair of video telephone is set up and is called out, and needs set up earlier by service provider server the physical layer channel of 64K, utilize this physical layer channel to shake hands after, communicating pair just can use the 3G-324M agreement to carry out the audio or video data interaction of reality.
In shaking hands of carrying out of above-mentioned communicating pair or actual audio or video data exchange process, the mutual data of communicating pair all comprise the fixing code stream of filling of a part, and this is fixing fills the corresponding different H.223 compound rank of code stream and difference.In general, H.223 compound rank is three grades, transmitting terminal in the Correspondent Node always sends data with a H.223 compound rank, with compound rank two H.223 is example, if the fixedly filling code stream of this compound rank correspondence is E14D000000, then when transmitting terminal sends data with this compound rank, need in data, to carry at least one E14D000000, Fig. 2 shows the fixedly filler code flow diagram of H.223 compound rank two, be example still with above-mentioned E14D000000, as can be seen, in each row, comprise a fixing code stream of filling at least.
Said fixing is filled code stream and there is a kind of corresponding relation in the bit element flow coded sequence.If transmitting terminal sends the fixedly filling code stream that carries in the data, is identical with the corresponding H.223 fixedly filling code stream that compound rank adopted of receiving terminal, then transmitting terminal is identical with the bit element flow coded sequence that receiving terminal adopts separately; If transmitting terminal sends the fixedly filling code stream that carries in the data, is the inversion code of the receiving terminal correspondence fixedly filling code stream that H.223 compound rank adopted, then the bit element flow coded sequence of transmitting terminal employing is the bit element flow coded sequence inversion code that receiving terminal adopts.For example, the fixedly filling code stream that carries in the data that transmitting terminal sends is E14D000000, binary form is shown 1,110 0,001 0,100 1101, and the receiving terminal correspondence fixedly filling code stream that H.223 compound rank adopted is 87B2000000, binary form is shown 1,000 01,111,011 0010, and promptly these two the fixing code streams of filling are the inversion code relation.Can judge that based on above-mentioned situation transmitting terminal also becomes the inversion code relation with the data that receiving terminal forms according to the bit element flow coded sequence that is adopted separately.
Fig. 3 strengthens the method flow diagram of interoperability of visual telephone for the present invention, and this flow process comprises:
Step 301: the data that the received communication opposite end sends.
Step 302: the fixedly filling code stream of resolving described data carry is the inversion code of the fixedly filling code stream of local terminal employing, draws analysis result.
In this step, parse operation can be specially: the fixedly filling code stream of determining described data carry, when the fixedly filling code stream that adopts with each H.223 compound rank of local terminal is all inequality, determine the inversion code that this fixing filling code stream is the fixedly filling code stream of a certain H.223 compound rank employing of local terminal, determine that the bit element flow coded sequence that Correspondent Node and local terminal adopt also becomes inversion code to concern this moment.
Step 303:, the data that described Correspondent Node sends are carried out the inversion code conversion according to analysis result.
In this step, after the data that Correspondent Node is sent were carried out the inversion code conversion, the bit element flow coded sequence of these data was just identical with the bit element flow coded sequence of local terminal employing, on the basis of conversion operations, follow-up separated Combined Processing and just can correctly carry out.
The present invention strengthens the method for interoperability of visual telephone, when the fixedly filling code stream of resolving the data carry that Correspondent Node sends is the inversion code of the fixedly filling code stream that adopts of local terminal, the data that Correspondent Node sends are carried out the inversion code conversion, the bit element flow coded sequence that data fit local terminal after the conversion adopts, since follow-up separate Combined Processing at be the data that meet the bit element flow coded sequence that local terminal adopts, so can access correct result, thereby adopt at communicating pair under the situation of different bit element flow coded sequences, strengthened the interoperability of video telephone.
When the Correspondent Node in the above-mentioned steps 301～step 303 is in called state, in step 303, when the data of Correspondent Node transmission are carried out the inversion code conversion, can further include, the data that local terminal sends to Correspondent Node are also carried out the inversion code conversion, just be converted to the bit element flow coded sequence of Correspondent Node employing identical to the bit element flow coded sequence of the data of Correspondent Node transmission local terminal, Correspondent Node is when receiving data like this, just need not to carry out again the inversion code conversion operations, handle and can directly carry out follow-up demultiplexing, simplified the operation of Correspondent Node.
In above-mentioned steps 303, the data that Correspondent Node sends are carried out the inversion code conversion, multiple different execution mode can be arranged, for example shifting function or carry out assignment according to the code stream transition matrix that sets in advance and handle hereinafter will describe in detail this.
From the protocol specification angle, the invention described above strengthens the method for interoperability of visual telephone, be equivalent in existing 3G-324M protocol layer, increase an automatic conversion layer of code stream, Fig. 4 strengthens the configuration diagram of video telephone in the method for interoperability of visual telephone for the present invention, compare with existing video telephone framework shown in Figure 1 as can be seen, increased an automatic conversion layer of code stream at the 3G-324M protocol layer.
Enumerate a specific embodiment of method provided by the invention below.Application scenarios in the present embodiment comprises the following aspects:
1) caller is provided with transmission process and receiving process in called mobile phone, wherein transmission process is finished the function that sends data to Correspondent Node, and receiving process is finished the function of the data of received communication opposite end transmission, just can start these two processes when mobile phone starts;
2) caller with compound rank two H.223 to called transmission data, fixedly filling code stream in the data is E14D000000, corresponding binary form is shown 1,110 0,001 0,100 1101, called is 87B2000000 at the fixedly filling code stream of compound rank two correspondences H.223, corresponding binary form is shown 10,000,111 1,011 0010, i.e. the fixedly filling code stream that caller sends data carry is the inversion code of the fixedly filling code stream of called employing;
3) set in advance the code stream transition matrix, this code stream transition matrix comprises: the mapping relations of data to be converted and inversion code transformation result.Fig. 5 shows an example of this code stream transition matrix, above-mentioned mapping relations are actual to be meant, with data conversion to be converted is decimal representation, on the position in the code stream transition matrix of this decimal representation indication, be specially from first data of code stream transition matrix and begin laterally to sort in turn, the data of corresponding above-mentioned position are exactly the result after data to be converted are carried out the inversion code conversion; For example, if the data that caller sends are 0xCD, being converted into the decimal system is 207, and in code stream transition matrix shown in Figure 5, finding data corresponding on the 207th position is 0xB3, and 0xB3 is exactly the result after 0xCD carries out the inversion code conversion; Invocation code stream translation matrix can carry out high efficiency assignment and handle, and is expressed as AfterReflect=Reflect[0xCD with functional expression], wherein AfterReflect represents to carry out the result after the inversion code conversion.
Based on above application scenarios, Fig. 6 shows the flow process of present embodiment, and this flow process comprises:
Step 601: caller and called between set up the 64K physical layer channel.
Step 602: whether the called local terminal Modem that intercepts has data to arrive, if not then continue to keep intercepting state, if the execution in step 603 of continuation is arranged.
Step 603: the called search in the data that the Modem transmission comes fixed the filling code stream, whether the fixedly filling code stream that carries in the judgment data is identical with the fixedly filling code stream that the H.223 compound rank two of local terminal adopts, if not execution in step 604 then, if direct execution in step 606 then.
Step 604: the fixedly filling code stream that carries in the called specified data is the inversion code of the fixedly filling code stream of H.223 compound rank two employings of local terminal, and notice local terminal transmission process need be carried out the inversion code conversion operations.
Step 605: the code stream transition matrix that called transmission process transfer sets in advance, will carry out inversion code conversion to the data that caller sends, the bit element flow coded sequence that the data fit caller after the conversion is adopted; Called receiving process calls the code stream transition matrix that sets in advance, and carries out the inversion code conversion with receiving the data that caller sends, the bit element flow coded sequence that the data fit local terminal after the conversion is adopted.
Step 606: calledly carry out the follow-up Combined Processing of separating to receiving data, the subsequent treatment in this step with well known to a person skilled in the art that general knowledge is identical.
Through above-mentioned steps 601～step 606, the judgement and the operation of inversion code conversion operations have been finished the callee, the callee has not only carried out the inversion code conversion with the data that receive, the data that needs sent to the calling party are also carried out the operation that inversion code is changed, can directly carry out subsequent treatment after making the calling party receive the data that the callee sends, simplify calling party's operation.
Secondly, introduce the device that the present invention strengthens interoperability of visual telephone.
Fig. 7 strengthens the apparatus structure schematic diagram of interoperability of visual telephone for the present invention, and this device comprises:
Receiver module is used for the data that the received communication opposite end sends;
Parsing module, the fixedly filling code stream that is used to resolve the data carry that described Correspondent Node sends are the inversion code of the fixedly filling code stream that adopts of local terminal, draw analysis result;
First modular converter is used for the analysis result that draws according to described parsing module, and the data that described Correspondent Node sends are carried out the inversion code conversion.
The present invention strengthens the device of interoperability of visual telephone, when the fixedly filling code stream of resolving the data carry that Correspondent Node sends is the inversion code of the fixedly filling code stream that adopts of local terminal, the data that Correspondent Node sends are carried out the inversion code conversion, the bit element flow coded sequence that data fit local terminal after the conversion adopts, since follow-up separate Combined Processing at be the data that meet the bit element flow coded sequence that local terminal adopts, so can access correct result, thereby adopt at communicating pair under the situation of different bit element flow coded sequences, strengthened the interoperability of video telephone.
The internal structure of above-mentioned parsing module can comprise:
Judging unit is used to judge that the fixedly filling code stream of the data carry that described Correspondent Node sends is whether identical with the fixedly filling code stream that local terminal adopts, and draws judged result;
Resolution executing, be used for the judged result that draws according to described judging unit, if the fixedly filling code stream of the data carry that described Correspondent Node sends is identical with the fixedly filling code stream that local terminal adopts, draws the data that directly described Correspondent Node sent and carry out the analysis result that demultiplexing is handled; If the fixedly filling code stream of the data carry that described Correspondent Node sends is inequality with the fixedly filling code stream that local terminal adopts, the fixedly filling code stream that draws the data carry that described Correspondent Node sends is the analysis result of inversion code of the fixedly filling code stream of local terminal employing.
The internal structure of above-mentioned receiver module can comprise:
Intercepting the unit, whether have data arrive, keep the state of intercepting when not having data to arrive if being used to intercept modulator-demodulator;
Receive performance element, be used for listening to modulator-demodulator when having data to arrive, receive the data that arrive in the described unit of intercepting.
When the device that strengthens interoperability of visual telephone as the present invention is positioned at a side of called state, this device can further include second modular converter, the fixedly filling code stream that is used for the data carry that the Correspondent Node that draws according to described parsing module sends is the analysis result of the inversion code of the fixedly filling code stream that adopts of local terminal, will carry out inversion code to the data that Correspondent Node sends and operate.
The device that comprises second modular converter based on device provided by the invention, to also carry out the inversion code conversion to the data that Correspondent Node sends, Correspondent Node is when receiving data like this, just need not to carry out again the inversion code conversion operations, handle and can directly carry out follow-up demultiplexing, simplified the operation of Correspondent Node.
The inversion code conversion operations that above-mentioned first modular converter and second modular converter are carried out, can realize by calling the code stream transition matrix that sets in advance, that introduces in this code stream transition matrix and the inventive method is identical, at this moment may further include memory module in this device, be used to store the code stream transition matrix that sets in advance, so that first modular converter and receiver module call the code stream transition matrix of storage when carrying out the inversion code conversion.
The present invention strengthens the device of interoperability of visual telephone, and the method that can use the present invention to strengthen interoperability of visual telephone is carried out work.
In sum, more than be preferred embodiment of the present invention only, be not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a method that strengthens interoperability of visual telephone is characterized in that, this method comprises:
The data that the received communication opposite end sends;
The fixedly filling code stream of resolving the data carry of described Correspondent Node transmission is the inversion code of the fixedly filling code stream of local terminal employing, draws analysis result;
According to described analysis result, the data that described Correspondent Node sends are carried out the inversion code conversion;
The fixedly filling code stream of the data carry that described parsing Correspondent Node sends is before the inversion code of the fixedly filling code stream that adopts of local terminal, further comprises:
Whether the fixedly filling code stream of judging the data carry that described Correspondent Node sends is identical with the fixedly filling code stream of local terminal employing, if, directly the data that described Correspondent Node is sent are carried out the demultiplexing processing, otherwise, continue to carry out fixedly filling code stream that described resolution data carries and be the step of the inversion code of the fixedly filling code stream that local terminal adopts.
2. the method for claim 1 is characterized in that, the data that described received communication opposite end sends are:
Whether in local terminal modulator-demodulator have data arrive, if do not have, continue to keep intercepting state if intercepting, if having, then receive the data that arrive.
3. the method for claim 1 is characterized in that, the described data that Correspondent Node is sent carry out further comprising after the inversion code conversion:
To carry out the inversion code conversion to the data that described Correspondent Node sends.
4. method as claimed in claim 3 is characterized in that, sets in advance the code stream transition matrix, and this code stream transition matrix comprises: the mapping relations of data to be converted and inversion code transformation result;
The described data that Correspondent Node is sent are carried out inversion code and are converted to: call described code stream transition matrix, according to described mapping relations, search the inversion code transformation result of the data correspondence of Correspondent Node transmission;
Describedly will carry out inversion code to the data that Correspondent Node sends and be converted to: call described code stream transition matrix,, search the inversion code transformation result of the data correspondence that sends to Correspondent Node according to described mapping relations.
5. a device that strengthens interoperability of visual telephone is characterized in that, this device comprises:
Receiver module is used for the data that the received communication opposite end sends;
Parsing module, the fixedly filling code stream that is used to resolve the data carry that described Correspondent Node sends are the inversion code of the fixedly filling code stream that adopts of local terminal, draw analysis result;
First modular converter is used for the analysis result that draws according to described parsing module, and the data that described Correspondent Node sends are carried out the inversion code conversion;
Described parsing module comprises:
Judging unit is used to judge that the fixedly filling code stream of the data carry that described Correspondent Node sends is whether identical with the fixedly filling code stream that local terminal adopts, and draws judged result;
Resolution executing, be used for the judged result that draws according to described judging unit, if the fixedly filling code stream of the data carry that described Correspondent Node sends is identical with the fixedly filling code stream that local terminal adopts, draws the data that directly described Correspondent Node sent and carry out the analysis result that demultiplexing is handled; If the fixedly filling code stream of the data carry that described Correspondent Node sends is inequality with the fixedly filling code stream that local terminal adopts, the fixedly filling code stream that draws the data carry that described Correspondent Node sends is the analysis result of inversion code of the fixedly filling code stream of local terminal employing.
6. device as claimed in claim 5 is characterized in that, described receiver module comprises:
Intercepting the unit, whether have data arrive, keep the state of intercepting when not having data to arrive if being used to intercept the local terminal modulator-demodulator;
Receive performance element, be used for listening to the local terminal modulator-demodulator when having data to arrive, receive the data that arrive in the described unit of intercepting.
7. device as claimed in claim 5 is characterized in that, further comprises second modular converter in this device, is used for the analysis result that draws according to described parsing module, will carry out the inversion code conversion to the data that Correspondent Node sends.
8. device as claimed in claim 7 is characterized in that, further comprises memory module in this device, is used to store the code stream transition matrix that sets in advance, and this code stream transition matrix comprises: the mapping relations of data to be converted and inversion code transformation result;
The data that described first modular converter sends Correspondent Node are carried out the inversion code conversion, are by calling described code stream transition matrix, and the inversion code transformation result of the data correspondence that sends according to described mapping relationship searching Correspondent Node realizes;
Described second modular converter will carry out inversion code conversion to the data that Correspondent Node sends, and be by calling described code stream transition matrix, according to described mapping relations, search that the inversion code transformation result of the data correspondence that sends to Correspondent Node realizes.
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| CN101065943A (en) * | 2004-11-26 | 2007-10-31 | 艾利森电话股份有限公司 | Performance analysis of a circuit switched mobile telecommunications network |
| CN1867171A (en) * | 2005-11-17 | 2006-11-22 | 华为技术有限公司 | Method for improving dedicated channel wireless resource utilization ratio |
| CN101030920A (en) * | 2006-02-27 | 2007-09-05 | 华为技术有限公司 | Method and system for transmitting optional field in data packet |
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