CN2919700Y - Receiving device of wireless communication system - Google Patents
Receiving device of wireless communication system Download PDFInfo
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- CN2919700Y CN2919700Y CN 200620120900 CN200620120900U CN2919700Y CN 2919700 Y CN2919700 Y CN 2919700Y CN 200620120900 CN200620120900 CN 200620120900 CN 200620120900 U CN200620120900 U CN 200620120900U CN 2919700 Y CN2919700 Y CN 2919700Y
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Abstract
The utility model relates to a receiving device for a wireless communication system. The utility model eliminates the network bandwidth jam caused by the confirmation message sent by the receiver to the transmitter. When the equipment receives the header grouping data which is served as the reference header, the utility model sends the feedback signal to the transmitter, the receiving equipment includes a data receiving unit, a timer, and a response-feedback device, wherein the timer is connected with the receiving unit and is started when receiving grouping data. The response-feedback device is connected with the timer, when the time comes to the preset point, the feedback signal is sent to the transmitter.
Description
Technical field
The present invention relates to a kind of receiving equipment of wireless telecommunication system, this device responds feedback device links to each other with timer, timer then after, to the transmitter feedback response information, eliminate the poor efficiency of the network bandwidth that a large amount of affirmations of being sent to transmitter by receiver cause and use.
Background technology
Use for the real-time multimedia based on Internet Protocol (IP), grouping is used to carry real time data.Each grouping comprises title and payload.Title carries the information such as the source and destination address of grouping, and payload carries the data that will send.Each grouping is formatted according to IP and real time transport protocol (RTP), and described real time transport protocol mainly is used on the User Datagram Protoco (UDP) (UDP).The detailed description of RTP is seen people's such as H.Schulzrinne " RTP: be used for the host-host protocol used in real time " literary composition (" RTP:A Transport Protocol for Real-Time Applications " by H.Schulzrinne, etal, Internet Engineering Task Force, (IETF) Request for Comments (RFC) 1889, January 1996).The size of the combination IP/UDP/RTP title that is used to divide into groups is at least 40 bytes to IPv4, and IPv6 is at least 60 bytes.The expense of 40 to 60 bytes altogether of each grouping is subjected to can being regarded as in system's (for example, such as Cellular Networks) of common concern a large amount of in spectrum efficiency.Therefore need suitable IP/UDP/RTP header compression mechanism.Present header compression scheme is at " for a low-speed serial link compressed IP/UDP/RTP title " literary composition (" CompressingIP/UDP/RTP Headers for Low-Speed Serial Links " by S.Casner et al of people such as S.Casner, IETF, RFC 2508, February 1999) and " IP header compression " literary composition (" IPHeader Compression " by M.Degermark et al of people such as M.Degermark, IETF, RFC 2507, and February 1999) in be described.The header compression scheme of in RFC 2508, describing can be on point-to-point link with the IP/UDP/RTP header compression to 2 or 4 bytes of 40 to 60 bytes.
This header compression scheme is based on following observation: most of fields of the title that divides into groups in the stream of packets remain unchanged during whole session.Therefore, might compress heading message by setting up compressive state (context) at compressor reducer (transmitter) and decompression machine (receiver).Grouping with compression title then is sent to decompression machine from compressor reducer, the reference title that wherein said compression title stores corresponding to the part as compressive state.Each compression title comprises minimum information.The information of carrying in the compression title is extracted in decompression machine according to the compressive state of setting up.
In RFC 2508, be grouped into the variation that occurs the next grouping from one in the RTP header field and can utilize linear extrapolation and predict from the title that the front inerrancy receives such as the RTP time mark.Therefore, in the RTP title, the main information that is sent out is to be used to the serial number that packet loss detects.For beginning session between compressor reducer and decompression machine or synchronous again compressive state, the grouping that comprises full title (FH:Full Header) is sent to decompression machine from compressor reducer.FH comprise grouping title all information and be used as (storage) with reference to title.After session has been initialised or has been performed synchronously, send all subsequent packets with compression title.The compression title for example has two types.
When the follow-up title of the grouping of follow-up transmission can use the compression title of the first kind with linear mode when title is before extrapolated.In this set, compressor reducer sends serial number as the compression title.Such compression title is called as secondary (SO:second order) title.When the follow-up title of the grouping of follow-up transmission can not be extrapolated with linear mode, use the compression title of second type.In this set, compressor reducer will comprise that the additional information of serial number sends as the compression title.Such compression title is called as once (FO) title.The FO title comprises that the compression title to the grouping of described follow-up transmission carries out the required additional information of accurate decompress(ion).In RFC 2508, all titles that are extracted all are stored and are the reference title.For current title is carried out decompress(ion), decompression machine must be exactly decompress(ion) before title.In practice, have that being grouped in of compression title lost during the transmission or destroyed much.This causes compressor reducer and decompression machine to be in the suboptimum state in certain duration.Same situation can take place because of the round trip delay when reception has the grouping of compression title.Therefore, the data flow of being handled by compressor reducer and decompression machine may need other bandwidth.
Receive that by sending indication to compressor reducer the affirmation of FH or the grouping of FO title improves the header compression scheme of describing the RFC 2508 from decompression machine.Receive the affirmation that FH divides into groups in response to indication, compressor reducer switches to the FO state and begins to send the grouping of FO title, wherein can not carry out linear extrapolation, and perhaps compressor reducer switches to 50 states and begins to send the grouping of 50 titles, wherein can carry out linear extrapolation.Be similar to the FH grouping, receive the affirmation that the FO title divides into groups in response to indication, compressor reducer switches to 50 states and begins to send the grouping of 50 titles.In such as the makeing mistakes of honeycomb/loss communication environment, decompression machine sees that up to it altered behavior could be determined to confirm suitably to be received by compressor reducer on the parts of compressor reducer.That is, the decompression machine in the conventional apparatus did not all know to confirm suitably to be received before it sees that compressor reducer changes its behavior.Just, decompression machine sees that the grouping of FO title replaces FH grouping or the grouping of 50 titles to replace the grouping of FO title.Simultaneously, decompression machine sends the affirmation to the title of receiving each grouping always.In addition, round trip delay made the decompression machine in the conventional apparatus not know to confirm suitably to be received always during the reception that is caused by the altered behavior of compressor reducer was divided into groups.Therefore, conventional art has and fails effectively to utilize the shortcoming of the network bandwidth.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of receiving equipment of wireless telecommunication system, eliminates the poor efficiency of the network bandwidth that a large amount of affirmations of being sent to transmitter by receiver cause and uses.
In order to solve the problems of the technologies described above, the invention provides a kind of receiving equipment of wireless telecommunication system, after receiving the title grouped data that will be used as with reference to title, to the transmitter feedback response information, it is characterized in that, described receiving equipment comprises data sink, timer, responsive feedback device, and wherein said timer links to each other with receiving system, starts after receiving described grouped data; Described responsive feedback device links to each other with timer, timer then after, to the transmitter feedback response information.
Described length of timer is provided with in advance by system.
Described length of timer is according to receiving that in receiving equipment described transmitter received the time set of the indication of feedback response information.
Described timer is arranged in the user terminal.
Described receiving equipment is for constituting the decompression machine in the wireless system network infrastructure.
Described transmitter is for constituting the compressor reducer in the wireless system network infrastructure.
This equipment is used for using by the poor efficiency that provides indication from the receiver to the transmitter to receive to have the sparse feedback with the grouping of the title of title for referencial use, eliminate the network bandwidth that a large amount of affirmations of being sent to transmitter by receiver cause.
Description of drawings
Fig. 1 is the schematic diagram of one embodiment of the present of invention;
Fig. 2 is the exemplary plot according to network system architecture of the present invention;
Fig. 3 is the efficient use schematic diagram according to the bandwidth of the network system of the technology of the present invention;
Fig. 4 is the schematic diagram that is not received according to FB (n) in the efficient use of the bandwidth of the network system of the technology of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
As shown in Figure 1, described receiving equipment 1, after receiving the title grouped data that will be used as with reference to title, to transmitter 2 feedback response information, described receiving equipment comprises data sink 11, timer 13, responsive feedback device 12, wherein said timer links to each other with receiving system, starts after receiving described grouped data; Described responsive feedback device links to each other with timer, timer then after, to the transmitter feedback response information.
Be illustrated among the Fig. 2 to 4 of being applied in of the present invention.But, should be appreciated that the present invention is not limited to this, and can realize with other architecture.Below the present invention is described as being applicable to and uses compressor reducer and decompression machine to have the system of the grouping of compression title with transmission.But the minimizing that the present invention can be applied to also that bandwidth need be preserved and send to the affirmation quantity of transmitter from receiver can effectively improve any system of bandwidth.
Network system of the present invention shown in Figure 2 provides the terminal 102 that is connected to IP network 108.Terminal 102 for example can be personal computer, telephone device, main frame, portable computer or other any this class device of handling of carrying out according to IP/RTP/UDP.Specifically, terminal 102 can provide the grouping of sound samples, and described sampling is formatted according to RTP, is used for transmission on positive network 108.In order to realize this point, terminal 102 comprises RTP end points 104, and it is the source and destination of marking terminal 102 (for example, comprising IP address, port numbers etc.) for the RTP grouping.Although IP network is provided as example, also can replace with the packet switching network of other type using.Terminal 102 also comprises the local timer that is used for the generation time mark.
Access Network infrastructure (ANI) 110 is connected to IP network 108.Wireless terminal 130 is connected to ANI110 by radio frequency (RF) link 140.RF link 140 comprises up link 142 and down link 144, and wherein up link 142 sends data from terminal 130 to ANI110, and down link 144 sends data from ANI110 to terminal 130.ANI110 will be positioned at the different one or more wireless or RF terminals local, that comprise terminal 130 in zone and be connected to IP network 108.ANI110 is provided by the function of changing between the wireless or RF signal that provides such as the wire signal that provides in IP network 108 with such as the terminal of terminal 130.Therefore, ANI110 allows to be sent to terminal 130 from the RTP grouping that IP network 108 receives by RF link 140, and allows to be sent to for example terminal 102 from the RTP grouping that for example terminal 130 receives by IP network 108.
According to the present invention, ANI 110 comprises one or more ANI adapters (ANI_AD) such as ANI_AD 112 and ANI_AD114.Each ANI_AD comprises timer 113, and passing through down link 144 before terminal 130 sends the RTP grouping, header compression is carried out in described grouping, and divides into groups after terminal 130 is sent out by up link 142 at RTP, to its execution title decompress(ion).The title of each grouping comprises one or more fields such as the time mark field.By down link 144 before terminal 130 sends, the title of each grouping that receives from IP network 108 is compressed by ANI_AD 112 according to RFC2508.Before sending to IP network 108, the title of each grouping that receives from terminal 130 by up link 142 carries out decompress(ion) according to RFC 2508 by ANI_AD 112.Therefore, each ANI_AD has served as compressor reducer and/or decompression machine (compressor/decompressor 115).Therefore, realize in any device (as router, main frame, telephone device etc.) that can in system, comprise according to the compression/decompression function of RFC 2508.
The terminal that each ANI_AD will be positioned at the specific place in zone is connected to IP network 108, and the compression/decompression technology of utilizing timer 113 to realize based on timer.ANI_AD 112 comprises that also shake reduces function JRF 116, measures the shake of the grouping (or title) that receives by IP network 108 and abandons any grouping/title with excessive jitter with it.Additional ANI such as ANI 120 is provided, and other terminal that it is used to be positioned at other place in other zone is connected to IP network 108.ANI120 comprises one or more ANI_AD such as ANI_AD 122 similarly, as mentioned above, wherein comprises timer and JRF at least.Terminal 130 comprises RTP end points 132, and its marking terminal (for example, comprising IP address, port numbers etc.) is the source and/or the purpose of RTP grouping.Terminal 130 also comprises terminal adapter (TERM_AD) 136, and it carries out header compression to the title of the grouping that will send by up link 142, and the title of the grouping that receives by down link 144 is carried out the title decompress(ion).Therefore, TERM_AD136 has served as compressor reducer or the decompression machine (compressor/decompressor 137) of similar ANI_AD.TERM_AD 136 comprises timer 134, is used to calculate RTP time tag approximate of current title and measures elapsed time between the grouping that receives continuously.
Configuration shown in Fig. 2 is the example that realizes system of the present invention therein, and wherein RTP grouping is sent out by link or communication port such as Radio Link 140, and wherein bandwidth is of great rarity and mistake is not uncommon.But the present invention is not limited to Radio Link, and in fact it is applicable to multiple link or the communication port that includes wired link.For example, the present invention may be applied in the grouping that is used for the voice by IP network or IP phone.For the present invention's related characteristics in Fig. 2 are described, carry out following hypothesis.The data that for example comprise the block form of voice are sent to terminal 130 by IP network 108 through ANI 110, ANI_AD112 and down link 144 from terminal 102.In order to preserve the bandwidth of down link 144, the title of each grouping that sends from terminal 102 compresses by the compressor/decompressor 115 that constitutes ANI_AD 112 parts.Grouping with compression title sends to terminal 130 by compressor/decompressor 115 through down link 144.The 130 pairs of titles by the grouping of down link 144 transmissions of terminal that comprise compressor/decompressor 137 carry out decompress(ion), to obtain original packet.Original packet is then handled by terminal 130.In order to begin the session between compressor/decompressor 115 and the compressor/decompressor 137 or to serve as the compressor/decompressor 115 of compressor reducer more synchronously and serve as compressive state between the compressor/decompressor 137 of decompression machine, comprise such as full title (FH) or once the grouping of the reference title of (FO) title be sent to decompression machine 137 from compressor reducer 115.FH or FO title comprise the information corresponding to the field of the title of grouping.This information is stored in compressor reducer 115 and the decompression machine 137 as reference title (context).After session has been initialised or has been performed synchronously, send all follow-up groupings that will send to decompression machine 137 from compressor reducer 115 with compression title.The compression title for example can have two types.When the title of the grouping of follow-up transmission can use the compression title of the first kind with linear mode when the reference title is extrapolated.This class compression title is called as secondary (SO) title.The FO title is the compression title of second type.When the title of the grouping of follow-up transmission can not be extrapolated with linear mode, use the FO title.According to noted earlier, FH and FO title all are used as with reference to title.
When receiving FH grouping or FO grouping, decompression machine 137 provides indication to receive the feedback of FH grouping or FO grouping to compressor reducer 115.Be noted that compressor reducer 115 sends FH grouping or the grouping of FO title continuously, up to receiving the feedback of suitably receiving FH grouping or the grouping of FO title from the indication of decompression machine 137.Feedback from decompression machine 137 is sent to compressor reducer 115 by up link 142.
In conventional art, decompression machine 137 sends to be confirmed, to divide into groups or the grouping of FO title in response to each FH that is sent continuously by compressor reducer 115.Therefore, conventional art poor efficiency ground uses the bandwidth of up link 142.
The method that the present invention preserves the bandwidth in the up link 142 is as follows: make decompression machine 137 send feedback, to divide into groups in response to FH grouping or FO title, in response to before FH grouping that sends continuously by compressor reducer 115 or the grouping of FO title and sending another feedback, wait for predetermined a period of time then.Therefore, decompression machine 137 sends a feedback in response to FH grouping or the grouping of FO title by up link 142, and waits for the indication that receives feedback from compressor reducer 115.If after predetermined a period of time, do not receive the indication that compressor reducer 115 receives feedback, then decompression machine 137 is in response to the FH grouping or the grouping of FO title of follow-up transmission and send another feedback.
In response to the FH of follow-up transmission grouping or the grouping of FO title and decompression machine 137 is waited for before sending another feedback predetermined a period of time provides feedback to arrive decompression machine is got back in the time of compressor reducers 115 and indication that compressor reducer 115 is received feedback by down link 144 time by up link 142.For example, predetermined certain hour can be got back to decompression machine 137 used two-way time (RTT) by down link 144 corresponding to sending grouping and described grouping by up link 142 to compressor reducer 115 from decompression machine 137.Having received feedack from the indication compressor reducer of compressor reducer 115 can be by for example sending the information that SO title grouping indication compressor reducer 115 has changed its behavior.
Fundamental characteristics of the present invention is: more possible is, will be suitably by the link between decompression machine 137 and the compressor reducer 115, so that make compressor reducer 115 change its behaviors by the feedback that decompression machine 137 sends to compressor reducer 115.Because more possible is to feed back suitably by the link between decompression machine 137 and the compressor reducer 115, so feedback is just not rarely found by the situation that compressor reducer 115 receives.When this happens, decompression machine sends another feedback once more, with FH grouping or the grouping of FO title in response to follow-up transmission.
Technology of the present invention has been done to specify in Fig. 3.In Fig. 3, T
DdBe 115 propagation delay from decompression machine 137 to compressor reducer, T
DuBe 137 propagation delay from the compressor reducer to the decompression machine, T
SamIt is the time interval between the continuous media sampling, HDR (n) is the grouping with title, wherein said title can be used as from compressor reducer 115 reference titles (FH or FO title) that send, that have serial number n, FB (n) is the feedback that sends to compressor reducer 115 from decompression machine 137 when receiving the grouping HDR (n) with described title, T
RoundBe that grouping is by the link between decompression machine 137 and the compressor reducer 115 and the round trip delay that returns, wherein T
Round=T
Dd+ T
Du, CH is the grouping with compression title, wherein said compression title can have more optimum state of FO suboptimum state or SO.
As shown in Figure 3, at time t0, compressor reducer 115 sends the grouping HDR (n) with title to decompression machine 137.At time t1, decompression machine 137 detects grouping HDR (n) with title and in response, sends feedback FB (n) to compressor reducer 115.Simultaneously, compressor reducer sends the grouping HDR with title continuously, up to time t1; Sending feedback FB (n) afterwards to compressor reducer 115, decompression machine 137 is waited for predetermined a period of time, and described predetermined a period of time is for example corresponding to T
RoundIn other words, decompression machine 137 is up to time T
RoundDo not send before finishing any other had another feedback of the grouping HDR of title.
In case compressor reducer 115 receives feedback FB (n) in time T 2, compressor reducer 115 changes its behavior and begins to send the grouping CH (n+T with compression title
Dd+ T
Du)/T
Samp).Decompression machine 137 receives the grouping CH (n+T with compression title from compressor reducer 115
Dd+ T
Du)/T
Samp), the FB of indication feedback thus (n) is suitably received by compressor reducer 115.
Fig. 4 explanation is wherein fed back FB (n) and is lost owing to for example link layer mistake according to a kind of situation of the present invention.In this case, decompression machine 137 is waited for, up to having spent predetermined a period of time, determines then not send information or the indication that relevant feedback FB (n) has been received from compressor reducer 115.Decompression machine 137 then sends another feedback FB to compressor reducer 115, with the grouping HDR with title in response to follow-up transmission, and waits for another predetermined a period of time.Certainly, if compressor reducer 115 does not send the indication that has received the feedback FB that sends once more, bottom line compressor reducer 115 and decompression machine 137 will remain on the suboptimum state so.The suboptimum state is to have to be used as the state that the grouping with reference to the title of title (FH or FO) is sent out.
Even also do not receive the indication of receiving feedback, the present invention also has advantage: with respect to the affirmation quantity that sends according to conventional art, send the feedback that has reduced quantity from decompression machine 137 to compressor reducer 115.According to the present invention, only after having spent predetermined a period of time, send subsequent feedback.Therefore, the invention provides from the feedback of decompression machine 137 to the sparse quantity of compressor reducer 115 transmissions.
According to the above, the invention provides a kind of poor efficiency using system that is used to eliminate the caused network bandwidth of a large amount of affirmations that sends to transmitter by receiver.By provide from the receiver to the transmitter, indication receives to have the sparse feedback that will be used as with reference to the grouping of the title of title, the present invention realizes described advantage.More particularly, when the present invention receives the grouping that has with reference to title in receiver, provide indication to receive to have the feedback of described grouping with reference to title to transmitter.Then, have in response to another another feedback is provided with reference to the grouping of title before, receiver is waited for predetermined a period of time.Described a period of time allows feedback to receive feedack by the link between the transmitter and receiver by link between the receiver and permission indication transmitter.Therefore, the present invention acknowledges receipt of the feedback that for example has with reference to the sparse quantity of the grouping of title by providing to transmitter, has effectively utilized the bandwidth of network.
The present invention is applicable to the system that spectrum efficiency receives publicity.The compression that the present invention also can be used for the title of the grouping that is sent out in the network system will provide the place of some efficient in the bandwidth of network system is used.In a kind of like this network system, on link between transmitter (compressor reducer) and the receiver (decompression machine) or communication port, set up compressive state, so that sending the grouping that sends between compressor reducer and the decompression machine on described link or the communication port with compression title.When the title of grouping will be used as with reference to title the time, the information information corresponding that comprises in the title by handle and grouping is stored in compressor reducer and the decompression machine as context (context), sets up compressive state.Each for example can be isolated system in the network system for compressor reducer and decompression machine, perhaps for example as network system included such as the part in any such device of router, main frame, terminal or other.
In the present invention, have the grouping that is used as with reference to the title of title and be sent to receiver from transmitter.For example, such grouping can be FH grouping or FO grouping.According to the present invention, receiver receives the grouping have with reference to title, and responds and provide indication to receive the feedback that has with reference to the grouping of title to transmitter.After described feedback is provided, have in response to another that sends by transmitter provide another feedback with reference to the grouping of title before, receiver is waited for predetermined a period of time.
Receiver is providing predetermined a period of time of waiting for before another feedback to allow to receive that the indication transmitter from transmitter received feedack.Predetermined a period of time can be for example corresponding to the round trip cycle that sends grouping and return to transmitter from receiver.For example, the information that returns to receiver by transmitter in response to feedback can be the information that the expression transmitter has changed its behavior.Particularly, described information for example can be the grouping that has corresponding to the compression title of reference title.This grouping for example can be the SO title.
Although describe the present invention in conjunction with the accompanying drawings in detail, the invention is not restricted to these details, because under the situation that does not break away from the spirit and scope of the present invention, can carry out perceptible many variations of those of ordinary skill in the art and modification.
Claims (6)
1, a kind of receiving equipment of wireless telecommunication system, after receiving the title grouped data that will be used as with reference to title, to the transmitter feedback response information, it is characterized in that, described receiving equipment comprises data sink, timer, responsive feedback device, wherein said timer links to each other with receiving system, starts after receiving described grouped data; Described responsive feedback device links to each other with timer, timer then after, to the transmitter feedback response information.
2, equipment as claimed in claim 1 is characterized in that, described length of timer is provided with in advance by system.
3, equipment as claimed in claim 1 is characterized in that, described length of timer is according to receiving that in receiving equipment described transmitter received the time set of the indication of feedback response information.
4, equipment as claimed in claim 1 is characterized in that, described timer is arranged in the user terminal.
5, equipment as claimed in claim 1 is characterized in that, described receiving equipment is for constituting the decompression machine in the wireless system network infrastructure.
6, equipment as claimed in claim 1 is characterized in that, described transmitter is for constituting the compressor reducer in the wireless system network infrastructure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620120900 CN2919700Y (en) | 2006-07-11 | 2006-07-11 | Receiving device of wireless communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620120900 CN2919700Y (en) | 2006-07-11 | 2006-07-11 | Receiving device of wireless communication system |
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| Publication Number | Publication Date |
|---|---|
| CN2919700Y true CN2919700Y (en) | 2007-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620120900 Expired - Lifetime CN2919700Y (en) | 2006-07-11 | 2006-07-11 | Receiving device of wireless communication system |
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| Country | Link |
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| CN (1) | CN2919700Y (en) |
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2006
- 2006-07-11 CN CN 200620120900 patent/CN2919700Y/en not_active Expired - Lifetime
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