CN102013964A - Wireless communication system and wireless communication method - Google Patents
Wireless communication system and wireless communication method Download PDFInfo
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- CN102013964A CN102013964A CN2010105578452A CN201010557845A CN102013964A CN 102013964 A CN102013964 A CN 102013964A CN 2010105578452 A CN2010105578452 A CN 2010105578452A CN 201010557845 A CN201010557845 A CN 201010557845A CN 102013964 A CN102013964 A CN 102013964A
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Abstract
The invention provides a wireless communication system and a wireless communication method. In a wireless communication system for retransmission control between a sending device and a receiving device, the sending device comprises a sending unit, a retransmission control unit and a receiving unit, wherein the sending unit is used for sending communication data to the receiving device; the retransmission control unit is used for sending data part of which is the same as the communication data to the receiving device without waiting for a negative answer signal relevant to the communication data from the receiving device and waiting for a negative answer signal or confirming answer signal relevant to the data part of which is the same as the communication data; and the receiving unit is used for receiving the negative answer signal or the confirming answer signal which is relevant to the data, part of which is the same as the communication data, and fed back by the receiving device. The receiving device comprises the sending unit, and the sending unit sends the negative answer signal or the confirming answer signal relevant to the data part of which is the same as the communication data to the sending device.
Description
Patent application of the present invention is that denomination of invention is that to be on July 8th, 2005, international application no be " PCT/JP2005/012677 ", national applications number dividing an application for the application for a patent for invention of " 200580051014.5 " for " dispensing device, receiving system, information communicating method ", international filing date.
Technical field
The present invention relates to wireless communication system and radio communication communication means, particularly be applied to constitute the dispensing device of wireless communication system and the repeating transmission control technology in the receiving system etc. and otherwise effective technique.
Background technology
Be in the moving communicating field of representative with portable phone etc.,, realizing that the requirement of high-speed high capacity communication is improving constantly in order to realize the Large Volume Data beyond the voice, the services such as transmitting-receiving of high meticulous view data.
In the current radio communication of wishing high-speed high capacity communication, the wireless technology that transmits interval mistake of necessary using compensation is to improve throughput.As the important wrong compensation technique that is used for this purpose, automatic repeating transmission control mode (ARQ:Automatic Repeat reQuest) is arranged.Fig. 1 is the concept map that illustrates as the effect of the ARQ of in the past repeating transmission control mode.Cyclic redundancy check (CRC) code) this ARQ is following mode: use to be attached to the CRC that sends in the grouping (Cyclic Redundancy Check code: error detection code such as, carry out error detection at each grouping, do not return ack signal to transmitter side when in the grouping that receives, having mistake, the transmission of the next grouping of request; Under distinguishing for vicious situation, (Not-ACKnowledge: negative response) signal is asked the repeating transmission of this grouping to return NACK.
One of this ARQ has HARQ (Hybrid-ARQ: hybrid ARQ).This is among the HARQ, also describes as example with the HARQ that uses branch to be combined into that mentions in the non-patent literature 1.Below in this paragraph, HARQ is meant and use divides the HARQ that is combined into.Fig. 2 is the concept map that the principle of this HARQ mode is shown.In HARQ, carried out after the error correction, used the CRC be attached to the end of transmit frame to wait to carry out error detection at each frame.When detecting mistake, return the NACK signal to transmitter side, ask the repeating transmission of this frame integral body.This moment, receiver side detected the received signal of wrong frame to the buffer input.The received signal of synthesizing the reception result and the first frame that sends of the frame of in HARQ, retransmitting.Thus, can utilize the soft-decision information of first frame, further improve receiving feature.
In with the repeating transmission control mode in the past headed by the HARQ, use the affirmation that is called RTT (RoundTrip Time, two-way time) to reply the stand-by period and control repeating transmission.This RTT for grouping from transmitter side arrive time till the receiver side, confirm till whether successful grouping that receiver side receives time, ACK/NACK that the result is confirmed in expression arrive transmitter side from receiver side time and, it uses the set value of stipulating.Transmitter side after sending data, when ack signal set RTT with interior when receiver side arrives, after sending through the RTT that is scheduled to, send new data from initial data, under the situation of NACK signal, after RTT, retransmit.When ACK or NACK at RTT with interior when not arriving transmitter side, transmitter side is retransmitted to receiver side.
(problem 1) expectation realizes and the seamless link of cable network, big capacity and this 2 point of wireless transmission at a high speed that (problem 2) transfer rate can reach 1Gbps in next generation mobile communication.Realizing to be widely used as TCP (the Transmission ControlProtocol: transmission control protocol) be installed in the wireless network of wired network transportation protocol aspect (problem 1).TCP is observation grid inside congested basically, do not having to improve transfer rate when congested gradually.Under the congested situation of generation, speed is dropped to minimum.Differentiate this congested generation by packet loss.
This has following problem when being in TCP being used for wireless system.When ACK does not return under the situation of transmitter side from receiver side in predetermined time-out time, TCP is judged as packet loss has taken place, but to compare time of delay longer with cable environment in wireless environment, is judged to be the probability that produces packet loss so surpass the time-out time of TCP and uprises.Its result, TCP are considered as because the congested packet loss that causes significantly limits the data influx that flows into to network, so under the situation about using in wireless environment, the throughput that is easy to the system that produces reduces.This becomes important problem when the high-capacity and high-speed that carries out (problem 2) transmits.Reduce in order to improve throughput, can consider to improve the methods such as time of delay in Transmission Control Protocol and the reduction wireless environment, adopt the latter herein.
Delay during retransmission process can be thought one of the reason of the processing delay of wireless environment.In the mode in the past of using RTT control to retransmit, because the value of RTT needed the time before transmission/repeating transmission new data, and then retransmission delay increases when repeating to retransmit, and causes that the throughput of system reduces.
In addition, in patent documentation 1, disclose following technology as conventional art: at decline and the different a plurality of wireless zones of line quality such as interference, make from the base station repeating transmission number of times difference to the call signal of mobile radio station, thereby suitably guarantee the traffic of calling channel simultaneously, wish simultaneously to guarantee sufficient call connection ratio, but the above-mentioned technical task of the repeating transmission of not recognizing communication data itself in controlling.
Non-patent literature 1:D.Chase, " Code Combining-A Maximum-LikelihoodDecoding Approach for Combining an Arbitrary Number of NoisyPackets; " IEEE TRANSACTIONSON COMMUNICATIONS, VOL.COM-33, NO.5, MAY 1985.
Patent documentation 1: Japanese kokai publication hei 10-13331 communique
Summary of the invention
The objective of the invention is to, the communication technology of the retransmission delay time in a kind of repeating transmission control of shortening communication data is provided.
Another object of the present invention is to provide a kind of communication technology, its traffic rate that propagation delay causes reduce (penalty) more serious with wireless communication networks that wire net is connected in, can realize radio communication based on the repeating transmission control of communication data, and the reduction that can not produce traffic rate.
The 1st aspect of the present invention provides a kind of wireless communication system of retransmitting control between dispensing device and receiving system, and described dispensing device has: transmitting element, and it sends communication data to receiving system; Retransmit control unit, it is not waited for the relevant negative acknowledgement of described communication data and arriving from described receiving system, promptly send the data division data identical, wait for the data division data identical relevant negative acknowledgement or affirmation answer signal arriving with described communication data with described communication data to described receiving system; And receiving element, it receives same data division data relevant negative acknowledgement or the affirmation answer signal identical with described communication data of replying from described receiving system, described receiving system has transmitting element, and described transmitting element sends with the data division data identical with described communication data relevant negative acknowledgement or affirmation answer signal to described dispensing device.
The invention described above the 1st aspect wireless communication system in, preferred described repeating transmission control unit is according to the reception with the relevant negative acknowledgement of the data division data identical with described communication data, execution is about the repeating transmission of described communication data.
The 2nd aspect of the present invention provides the wireless communications method in a kind of wireless communication system of retransmitting control between dispensing device and receiving system, in described dispensing device, sends communication data to receiving system; Do not wait for the relevant negative acknowledgement of described communication data and arriving from described receiving system, promptly send the data division data identical, wait for the data division data identical relevant negative acknowledgement or affirmation answer signal arriving with described communication data with described communication data to described receiving system; Described receiving system sends with the data division data identical with described communication data relevant negative acknowledgement or affirmation answer signal, and described dispensing device receives same data division data relevant negative acknowledgement or the affirmation answer signal identical with described communication data that sends from described receiving system.
Description of drawings
Fig. 1 is the concept map that illustrates as the effect of the ARQ of in the past repeating transmission control mode.
Fig. 2 is the concept map that the principle of HARQ mode in the past is shown.
Fig. 3 is the concept map that principle common in the information communicating method of the embodiments of the present invention is described.
Fig. 4 is the concept map that principle common in the information communicating method of the embodiments of the present invention is described.
Fig. 5 is the concept map that principle common in the information communicating method of the embodiments of the present invention is described.
Fig. 6 is the concept map that principle common in the information communicating method of the embodiments of the present invention is described.
Fig. 7 is the flow chart of an example that the effect of transmitter side common in the information communicating method of the embodiments of the present invention is shown.
Fig. 8 is the flow chart of an example that the effect of receiver side common in the information communicating method of the embodiments of the present invention is shown.
Fig. 9 is the concept map that illustrates as an example of the packet configuration in the information communication of an embodiment of the invention.
Figure 10 illustrates the concept map of application as an example of the structure of the communication system of the communication means of an embodiment of the invention.
Figure 11 illustrates the block diagram of enforcement as an example of the structure of the dispensing device of the information communicating method of an embodiment of the invention.
Figure 12 illustrates the block diagram of enforcement as an example of the structure of the receiving system of the information communicating method of an embodiment of the invention.
Figure 13 is the block diagram of an example of structure that the dispensing device of the information communicating method of implementing another embodiment of the invention is shown.
Figure 14 is the block diagram that the variation of the dispensing device shown in Figure 13 example is shown.
Figure 15 is the flow chart of effect that the variation of the dispensing device shown in Figure 14 example is shown.
Figure 16 is the block diagram of structure that another variation of the dispensing device in the another embodiment of the invention is shown.
Figure 17 is the flow chart of effect that the variation of the dispensing device shown in Figure 16 example is shown.
Figure 18 is the block diagram of structure example that the dispensing device of another execution mode of the present invention is shown.
Figure 19 is the flow chart of effect that the variation of the dispensing device shown in Figure 18 example is shown.
Figure 20 is the block diagram of structure of variation that the dispensing device of another execution mode of the present invention is shown.
Figure 21 is the flow chart of effect that the variation of the dispensing device shown in Figure 20 example is shown.
Figure 22 is the block diagram that the variation of the dispensing device in another execution mode of the present invention is shown.
Figure 23 is the flow chart of effect that the variation of the dispensing device shown in Figure 22 example is shown.
Embodiment
Below, describe embodiments of the present invention in detail with reference to accompanying drawing.
At first, use Fig. 3 that common principle in the communication means of each following execution mode and dispensing device, the receiving system is described.In ARQ mode in the past, as above-mentioned shown in Figure 1, with respect to sending new grouping and replying the stand-by period (RTT) through affirmation and retransmit afterwards, latency period T (T＜RTT), the forced retransmission grouping 10R (being referred to as " forced retransmission " in this manual) that forced retransmission communication data part and initial grouping 10 are identical in embodiments of the present invention.Being made as can be according to the repeating transmission frequency of transmission path information, several groupings of past, (Quality of Service: one of index service quality) is that instantaneity waits and changes time interval T to send the QoS of grouping.Thus, the grouping of forced retransmission more effectively utilizes time diversity, improves the possibility of correctly decoding at receiver side.
Below, actual retransmission process method when carrying out forced retransmission is described.In addition, suppose at the additional CRC of time point (the CyclicRedundancy check Codes: cyclic redundancy check (CRC) code), handle as NACK during when crc error that returns ACK/NACK from receiver side to transmitter side at transmitter side.
At first, consider the situation of mistakenly grouping of initial transmission being decoded at receiver side.Transmitter side is carrying out forced retransmission after the transmission elapsed time interval T of new grouping 10, so arrive through forced retransmission grouping 10R after the T in the arrival from new grouping 10 at receiver side.Receiver side carries out the decoding of forced retransmission grouping 10R, according to its result, returns ACK (affirmation answer signal) to transmitter side under the reception case of successful, returns NACK (negative acknowledgement) to transmitter side under situation about taking defeat.10 NACK arrives and also can not retransmit immediately even transmitter side newly divides into groups, but waits for ACK, the NACK of forced retransmission grouping 10R.Fig. 3 illustrates the state when correctly forced retransmission grouping 10R having been carried out decoding.If in the mode in the past of above-mentioned Fig. 1, subsistence level 2 * RTT before sending next new data, but in the manner the time by RTT+T realize.Therefore, can cut down the above processing delay of RTT-T.Opposite Fig. 4 illustrates the state of mistakenly forced retransmission grouping 10R being understood timing.In this case, the time point that arrives at the NACK of forced retransmission grouping 10R is retransmitted.Afterwards, repeat identical processing.
Next consider the situation of correctly grouping of initial transmission being decoded at receiver side.At receiver side, arrive through forced retransmission grouping 10R after the T in arrival from new grouping 10.Owing to correctly new grouping 10 is decoded,, when arriving, forced retransmission grouping 10R returns ACK to transmitter side so need not to carry out the decoding of forced retransmission grouping 10R at receiver side.
Fig. 5 illustrates the situation that correctly transmits the ACK of new grouping 10 to transmitter side.In this case, the time point that arrives at initial ACK sends new grouping 10, does not also carry out any action even the ACK of forced retransmission grouping 10R arrives.
In addition, Fig. 6 illustrates the situation that transmits the ACK of new grouping 10 to transmitter side mistakenly.In this case, wait for that the ACK of forced retransmission grouping 10R arrives, send new grouping 10.In this case, also can cut down the above processing delay of RTT-T.
With above-mentioned 4 kinds of situations according to transmitter side, when receiver side focuses on flow chart, as Fig. 7, shown in Figure 8.In this Fig. 7 and Fig. 8, comprise that also the situation of control information mistake describes.
In addition, the concrete example of the diagnostic method of new grouping 10 shown in the following key diagram 8 and forced retransmission grouping 10R.That is, to additional SN (the Sequential Number: the sequential sequence number) send of grouping.At this moment, under the situation of the new grouping 10 of transmitter side transmission, upgrade SN; Under the situation of the forced retransmission grouping 10R that retransmits, keep SN.By check this SN at receiver side, can differentiate new grouping 10 and forced retransmission grouping 10R.
Transmit frame control information 11 comprises by the control information 11a of information formations such as the address in the transmission destination of this grouping 10 (forced retransmission grouping 10R) or the source of transmission, line quality and the repeating transmission sequential sequence number 11b suitable with above-mentioned SN (Sequential Number).Grouping 10 and with this 10 corresponding forced retransmissions grouping 10R that divides into groups in, retransmit sequential sequence number 11b and send data 12 and equate mutually.
In the above description, after latency period T, carry out forced retransmission, but when being used to send, carry out under the situation of system of RRM,,, just can carry out forced retransmission as long as in resource, exist when idle even without latency period T.
In addition, prevent the waste of transmitted power in order in this system, to reduce useless repeating transmission, also can consider after the possibility that the prediction grouping needs to retransmit, to carry out forced retransmission.According to the repeating transmission frequency of several groupings of past and transmission path information etc., the prediction of retransmitting possibility.
After carrying out this prediction, carry out in the system of forced retransmission, under the situation that sends real time data, also can consider to judge whether also to add that one of the index of the QoS (Quality of Service) of data is that instantaneity is carried out forced retransmission.Requiring under the data conditions of instantaneity, the setting of the judgment standard of possibility is retransmitted in change, improves the possibility of carrying out forced retransmission.Thus,, improved the probability of forced retransmission, can play and significantly reduce the effect that retransmission process postpones though might carry out some useless repeating transmission.
Same as the method for considering QoS, also can consider under the urgent high situation of QoS, not predict and the method for carrying out the forced retransmission of stipulated number.Thus,, can save the time of using in the prediction, further reduce processing delay though the consumption of transmitted power becomes greatly.
Above mode with any one in the past the mode repeating transmission number of times of comparing time per unit all increase, so in being set with the system of maximum number of retransmissions, reach maximum number of retransmissions quickly, so can avoid useless delay at this time point.In addition, with mode and the time spent such as HARQ, retransmit synthetic can the reception sooner and error-free by using at receiver side.Therefore in being set with the system of retransmitting time-out time etc., correctly the possibility of decoding improves in binding hours.
(execution mode 1)
Figure 10 is the concept map of an example of structure that the communication system of the communication means of using present embodiment is shown, Figure 11 is the block diagram of an example of structure that the dispensing device of the information communicating method of implementing present embodiment is shown, and Figure 12 is the block diagram of an example of structure that the receiving system of the information communicating method of implementing present embodiment is shown.
Shown in Figure 10 illustration, the dispensing device 100 of present embodiment and receiving system 200 constitute the wireless communication system 90 of retransmitting use HARQ in the control mode and carry out radio communication mutually, and are connected with the wire net 20 that carries out information communication.Wire net 20 and wireless communication system 90 are for example by using communication protocols such as TCP/IP seamlessly to connect.
Shown in Figure 11 illustration, the dispensing device 100 of present embodiment comprises transmission buffer 101, retransmission buffer 102, RRM portion 103, retransmits control part 104, latency function portion 105, multiplexing unit 106, sending part 107, transmitting antenna 108 (Tx), reception antenna 109 (Rx), acceptance division 110 and control signal lsb decoder 111.
Multiplexing unit 106 is carried out the processing that grouping 10 and forced retransmission grouping 10R construct in the additional illustrative transmit frame control information 11 of above-mentioned Fig. 9, CRC portion 13 in the front and back that send data 12.
Sending part 107 carries out that data with grouping 10 and forced retransmission grouping 10R are converted to electromagnetic wave and from the processing of transmitting antenna 108 emissions.
Control signal lsb decoder 111 is decoded according to retransmitting control signal 40 from 50 pairs of the control informations of acceptance division 110 inputs, inputs to repeating transmission control part 104 described later.Retransmitting control signal 40 is made of ack signal 41 or NACK signal 42.Ack signal 41 is the affirmation answer signals of replying from this receiver side under the reception case of successful of receiver side (receiving system 200 described later) grouping 10.NACK signal 42 is the negative acknowledgements of replying from this receiver side under the situation about taking defeat of receiver side (receiving system 200 described later) grouping 10.
Repeating transmission control part 104 sends request signals 31 to retransmission buffer 102 output new datas, and this new data sends request signal 31 and provides the opportunity that the transmission data 12 that are stored in this retransmission buffer 102 are exported as grouping 10.In addition, this transmission that sends data 12 as opportunity, is sent notification signal 32 from transmission buffer 101 to retransmitting control part 104 inputs.
Retransmitting control part 104 carries out retransmission process to RRM portion 103 output re-send request may signals 33.
Under the situation of present embodiment, between repeating transmission control part 104 and RRM portion 103, be provided with latency function portion 105.
This latency function portion 105 makes from the re-send request may signal 33 of retransmitting control part 104 inputs and postpones above-mentioned time interval T and input to the action of RRM portion 103.
Herein, in the past as above-mentioned shown in Figure 1, retransmit control part 104 and during above-mentioned RTT, wait for arrival from the repeating transmission control signal 40 of receiver side according to sending notification signal 32, through this RTT or under the situation of NACK signal 42 arrivals this period, carry out the retransmission process of grouping 10 to RRM portion 103 input re-send request may signals 33.
Relative therewith, in the dispensing device 100 of present embodiment, retransmit control part 104 after detecting transmission notification signal 32, whether arrive irrespectively with repeating transmission control signal 40 (ack signal 41, NACK signal 42) from receiver side, shown in above-mentioned Fig. 3, Fig. 4, Fig. 5, Fig. 6 illustration, import re-send request may signals 33 via latency function portion 105 to RRM portion 103, thereby send forced retransmission grouping 10R to receiver side.
Promptly, under the situation of present embodiment, after the transmission of new grouping 10, pass through before the RTT, and, with whether receive with this divide into groups 10 corresponding from receiver side ack signal 41 and NACK signal 42 irrespectively, after the delay of the above-mentioned time interval T that controls by latency function portion 105, send forced retransmission grouping 10R forcibly.
On the other hand, shown in Figure 12 illustration, the receiving system 200 of present embodiment comprises reception antenna 201 (Rx), acceptance division 202, retransmits synthetic portion 203, retransmission buffer 204, ACK buffer 205, decoding processing portion 206, error detection portion 207, control information generating unit 208, sending part 209 and transmitting antenna 210 (Tx).
Retransmit synthetic portion 203 carry out as required the storage that will arrive from acceptance division 202 retransmission buffer 204 processing and to the overlapping processing that remains on the data the retransmission buffer 204 of data that arrives from acceptance division 202.
The synthetic portion 203 of above-mentioned repeating transmission is with reference to this ACK buffer 205, in this ACK buffer 205, do not store under the situation of ack signal 41, failure is handled in the reception that is considered as last time, carries out the processing to the data of the overlapping retransmission buffer 204 of data that arrives from acceptance division 202.In addition, store in ACK buffer 205 under the situation of ack signal 41, the reception that is considered as last time is handled successfully, suppresses the processing to the data of the overlapping retransmission buffer 204 of data that arrives from acceptance division 202.
Control information generating unit 208 is carried out following processing: SIR information 51 that will obtain from the repeating transmission control signal 40 (ack signal 41 or NACK signal 42) of error detection portion 207 input and from acceptance division 202 or the various information relevant with communications status are delivered to sending part 209 as control information 50, reply to the divide into groups dispensing device 100 in transmission source of 10R of grouping 10 or forced retransmission.
In addition, SIR information 51 comprises dispensing device 100 and (the Signal to Interference Ratio: value signal-to-jamming ratio) of the SIR in the wireless communications path this receiving system 200 that is surveyed by acceptance division 202.
Sending part 209 carries out processing that control information 50 is converted to electromagnetic wave and sends from transmitting antenna 210.
In addition, in above-mentioned Figure 11 and Figure 12,, illustrate dispensing device 100 and receiving system 200 independently for ease of explanation, but also can in carrying out a plurality of information-communication devices of information communication, have the group of dispensing device 100 and receiving system 200 respectively, 10 the two-way communication of dividing into groups.In this case, in each information-communication device, can adopt the structure of structural elements such as shared sending part common in dispensing device 100 and receiving system 200, acceptance division, antenna.That is, but dispensing device 100 and receiving system 200 part of configuration information communicator all.
Below, an example of the effect of dispensing device in the present embodiment 100 and receiving system 200 is described.
At first, in dispensing device 100, storage sends data 12 in transmission buffer 101, to send request signal 31 as opportunity from the new data of retransmitting control part 104, transmission data 12 in the transmission buffer 101 are constituted grouping 10, send via multiplexing unit 106, sending part 107, transmitting antenna 108.
In transmission buffer 101, along with finishing of this transmission, storage sends data 12 in retransmission buffer 102, and sends notification signal 32 to retransmitting control part 104 inputs.
It as opportunity, is retransmitted control part 104 and do not wait for through RTT, and, directly export re-send request may signals 33 to RRM portion 103 via latency function portion 105 with whether irrespectively from control signal lsb decoder 111 input repeating transmission control signals 40.When in Radio Resource, having the free time, RRM portion 103 from the transmission of initial grouping 10 through by the time interval T of latency function portion 105 controls (＜RTT) afterwards, send via multiplexing unit 106, sending part 107 and transmitting antenna 108 and to use the forced retransmission grouping 10R that is stored in the identical transmission data 12 in the retransmission buffer 102 and constructs.At this moment, as mentioned above, the transmission data 12 of forced retransmission grouping 10R and the address information etc. of retransmitting sequential sequence number 11b, control information 11a are identical with the value of original grouping 10.
In receiving system 200 sides, arrive reception antenna 201 (Rx) via transmission path from the transmission data 12 that dispensing device 100 arrives, carry out the decoding processing and the wrong determination processing of received signal via acceptance division 202, the synthetic portion 203 of repeating transmission and decoding processing portion 206, error detection portion 207, do not detect under the wrong situation in error detection portion 207, return ack signal 41 via control information generating unit 208, sending part 209 and transmitting antenna 210 (Tx) dispensing device 100, and be stored in the ACK buffer 205 to the source of transmission.
Detect under the wrong situation in error detection portion 207, return NACK signal 42 via control information generating unit 208, sending part 209 and transmitting antenna 210 dispensing device 100 to the source of transmission, savings produces the received signal of wrong grouping in retransmission buffer 204 simultaneously, and the repeating transmission after being used for is synthetic to be handled.
Promptly, in the demodulation process of this receiving system 200, detect under the situation of ack signal 41 in data (grouping 10) initial transmission, it is stored in the ACK buffer 205, it is not carried out demodulation even the forced retransmission of forced retransmission grouping 10R arrives yet, but return ack signal 41 to dispensing device 100.The control information 50 that receiving system 200 is made of ack signal 41 or NACK signal 42 and SIR information 51 to dispensing device 100 loopbacks, savings produces the received signal of wrong frame (grouping) in retransmission buffer 204 simultaneously, is used to retransmit synthetic processing.
In dispensing device 100, be imported into repeating transmission control part 104 by control signal lsb decoder 111 decoded ack signals 41 or NACK signal 42.Retransmit control part 104 and when input signal is ack signal 41, export new data transmission request signal 31, when input signal is NACK signal 42, send re-send request may signal 33 to retransmission buffer 102 via RRM portion 103.When in Radio Resource, having the free time, send recurrent signal from retransmission buffer 102.
This recurrent signal is after receiving system 200 sides are received, and is synthetic with the signal of savings in retransmission buffer 204 in the reception of last time, after 206 decodings of decoding processing portion, carries out error detection by error detection portion 207 after error correction.Repeat identical processing afterwards,, perhaps retransmit number of times and reach till the maximum number of retransmissions up to not detecting mistake at receiver side.
In addition, also can determine the pre-determined number of the forced retransmission grouping 10R in the dispensing device 100, this number of times of continuous retransmission when the forced retransmission of forced retransmission grouping 10R.
The processing of above-mentioned dispensing device 100 is described with reference to the flow chart of above-mentioned Fig. 7.
At first, after receiving system 200 transmissions comprise the new grouping 10 that sends data 12 (step 301), time interval T (＜RTT) in, directly send the forced retransmission that comprises the transmission data 12 identical and the retransmit sequential sequence number 11b 10R (step 302) that divides into groups with grouping 10 to receiving system 200.
Then, RTT with interior do not reply from receiving system 200 sides the control information 50 that comprises ack signal 41 or NACK signal 42 etc. during (step 303), and do not surpass set maximum number of retransmissions during (step 310), repeating step 301, step 302, exist in RTT under the situation of replying, differentiating the control information 50 of being replied has inerrancy (step 304).
Then, in control information 50, detect under the wrong situation, have or not the forced retransmission (step 306) corresponding, this control information 50 with this control information 50 whether T with interior arrival (step 307), with forced retransmission grouping 10R control information corresponding 50 inerrancy (step 308) and this control information 50 to be arranged be the ack signal 41 or the judgement (step 309) of NACK signal 42.
Then, in step 306, be judged to be under the situation that does not have forced retransmission, perhaps, in step 307, be judged to be control information 50 not under the situation of T with interior arrival, perhaps, in step 308, be judged to be with forced retransmission grouping 10R control information corresponding 50 and exist under the wrong situation, perhaps, in step 309, be judged to be under the situation that control information 50 is NACK signals 42, return step 301.
In addition, in step 306, be judged to be under the situation that has forced retransmission, and in step 307, be judged to be control information 50 under the situation of T with interior arrival, and being judged to be in step 308 with forced retransmission grouping 10R control information corresponding 50 does not have under the wrong situation, and in step 309, be judged to be under the situation that control information 50 is ack signals 41, finish the transmission of this grouping 10 and handle.
On the other hand, in step 304, be judged to be under the situation that does not detect mistake, further differentiate the control information 50 of being replied and be which (step 305) in ack signal 41 or the NACK signal 42.Then, under the situation that is judged to be NACK signal 42, be branched off into above-mentioned steps 306, carry out the determination processing of above-mentioned steps 306～step 309.
In addition, in step 305, be judged to be under the situation of ack signal 41, finish the transmission of this grouping 10 and handle.
On the other hand, the processing of receiving system 200 is shown in the flow chart of above-mentioned Fig. 8.That is, at first differentiate the control information 50 (step 311) that whether has correctly received in the transmit frame control information 11 that is included in the grouping 10 that is received, under the situation of incorrect control information 50, reply NACK signal 42 and end to dispensing device 100 sides.
In step 311, correctly received under the situation of control information 50, whether differentiate with further reference to repeating transmission sequential sequence number 11b is new grouping 10 (steps 312), under the situation that is new grouping 10, carry out decoding processing and error detection processing (step 313) by decoding processing portion 206 and error detection portion 207, differentiating has inerrancy (step 314), do not having under the wrong situation, reply ack signal 41 to dispensing device 100 sides, and storage ack signal 41 (step 315) and end in ACK buffer 205.
In above-mentioned steps 314, detect under the wrong situation, in retransmission buffer 204, preserve grouping 10 (steps 318), reply NACK signal 42 (step 319) and end to dispensing device 100.
In above-mentioned steps 312, be judged to be not new grouping 10, promptly be under the situation of forced retransmission grouping 10R, the reception of differentiating grouping 10 in advance with reference to ACK buffer 205 whether fail (whether being NACK signal 42 promptly) (step 316), under the situation of failure, execution is the processing (step 317) of the retransmission data of the data and the usefulness of retransmission buffer 204 (forced retransmission grouping 10R), the processing that execution in step 314 is later.
In step 316, be judged to be under the situation that receives successfully (not being NACK signal 42), reply ack signal 41 (step 315) and end to dispensing device 100.
Thus, in the present embodiment, in dispensing device 100, through before the RTT with whether receive NACK signal 42 irrespectively from receiving system 200, after the transmission of grouping 10, at the delay time lag T (＜RTT) forced retransmission of back timed sending and these 10 identical contents that the divide into groups 10R that divides into groups, even thereby in the situation (Fig. 3) of initial grouping 10 mistakes, any one wrong situation (Fig. 4) among grouping 10 and the forced retransmission grouping 10R, successfully receive initial grouping 10 but under receiving system 200 any one situation to the situation (Fig. 6) of ack signal 41 mistakes that dispensing device 100 is replied by receiving system 200, also can begin to retransmit with the time of delay of RTT+T, so compare with 2 * RTT in the conventional art of Fig. 1, shorten RTT-T the time of delay till retransmitting beginning, can shorten the retransmission delay time in the repeating transmission control that sends data 12.
By after grouping 10, retransmitting forced retransmission grouping 10R forcibly, shorten the time of advent till maximum number of retransmissions, can begin judgement and countermeasure that the bad transmission that causes of communication line state is interrupted as early as possible.
In addition, in receiving system 200 sides, stores packets 10 has inerrancy in ACK buffer 205, suppresses the decoding processing of follow-up forced retransmission grouping 10R under the reception case of successful of initial grouping 10, so also can not increase the power consumption (Fig. 5, Fig. 6) of the reception of grouping 10 in handling.
In addition, in the wire net 20 that carries out tcp/ip communication, with wireless communication system 90 that wire net 20 is connected in owing to the retransmission delay of grouping 10 is considered as producing under the situation of packet loss, be judged as this packet loss and result from congested in the wireless communication system 90, significantly limit the control action that flows into the data influx of wire nets 20 from wireless communication system 90, so reduce via the throughput of 90 of the wireless communication systems of wire net 20.
Relative therewith, under the situation of present embodiment, then divide into groups 10 T (＜RTT) with the interior forced retransmission grouping 10R that retransmits forcibly, reduce so in wire net 20, be considered as the probability of packet loss, can not reduce via the throughput of 90 of the wireless communication systems of wire net 20 yet.
(execution mode 2)
Figure 13 is the block diagram of an example of structure that the dispensing device of embodiments of the present invention 2 is shown.With the difference of above-mentioned execution mode 1 be to have appended prediction section 121 to dispensing device 100, the structure of receiving system 200 is identical with execution mode 1.
That is, under the situation of present embodiment 2, be imported into prediction section 121 from the transmission notification signal 32 of transmission buffer 101, re-send request may signal 33a is input to from this prediction section 121 and retransmits control part 104.
In addition, from control signal lsb decoder 111 to prediction section 121 input control informations 50.This control information 50 is sent here and is comprised the various information of representing communications status from receiving system 200.Then, prediction section 121 is according to control information 50, and whether prediction needs the forced retransmission of forced retransmission grouping 10R, controls by re-send request may signal 33a and retransmits control part 104.
In dispensing device 100, when transmission comprises the grouping 10 that sends data 12, send transmission notification signal 32 to prediction section 121.In prediction section 121,, the possibility that this grouping 10 is requested to retransmit is predicted according to control information 50 from 111 inputs of control signal lsb decoder.Under the high situation of possibility, send re-send request may signal 33a to retransmitting control part 104.Afterwards, with execution mode 1 in the same manner, send the re-send request may signal via latency function portion 105, RRM portion 103 to retransmission buffer 102, carry out forced retransmission.
Figure 14 is the block diagram of variation that the structure of above-mentioned Figure 13 is shown.In the structure of this Figure 14, produce the prediction that frequency is retransmitted possibility according to the repeating transmission of the grouping in past.
That is, between prediction section 121 and control signal lsb decoder 111, be provided with ACK/NACK buffer 122.In this ACK/NACK buffer 122, store each frequency by control signal lsb decoder 111 decoded ack signals 41 and NACK signal 42.
Promptly, prediction section 121 is when receiving transmission notification signal 32 (step 321) from transmission buffer 101, produce frequency information (step 322) from the repeating transmission that ACK/NACK buffer 122 is read with in the past n grouping 10 (frame) are relevant, calculate frame number (number of times of NACK the signal 42)/n (step 323) that retransmits generation Probability p=retransmit.
Afterwards, according to the QoS information 32a that sends here with transmission notification signal 32, differentiate whether this grouping (sending data 12) is real time data (step 324), under the situation that is real time data, will reduce p1 (step 326) as the threshold value Th of the determinating reference of carrying out forced retransmission.
Then, judge whether p＞Th sets up (step 325), under the situation that p＞Th sets up, send re-send request may signal 33a, make forced retransmission carry out (step 327) to retransmitting control part 104.
In addition, also can be after above-mentioned steps 321 have just been finished, read the horizontal information of the urgency relevant immediately with sending data 12 from QoS information 32a, under the high situation of urgency, also can omit the processing from step 322 to step 325, direct descendant carries out forced retransmission to step 327 and handles.
Figure 16 is the block diagram of structure that another variation of the dispensing device 100 in the present embodiment 2 is shown.In this case, the prediction of in prediction section 121, retransmitting possibility according to the SIR information of sending here from control signal lsb decoder 111 51.This SIR information 51 is followed control information 50 with ack signal 41 or NACK signal 42 and is arrived from receiving system 200 side.
In the structure of this Figure 16, also can make and retransmit the probability variation according to the QoS information 32a that sends data 12.Figure 17 is the flow chart of situation of processing that the prediction section 121 of this moment is shown.
That is, prediction section 121 obtains the value (SIR) (step 332) of SIR information 51 from control signal lsb decoder 111 when receiving transmission notification signal 32 from transmission buffer 101 (step 331).
Afterwards, according to the QoS information 32a that sends here with transmission notification signal 32, differentiate whether this grouping (sending data 12) is real time data (step 333), under the situation that is real time data, will improve s1 (step 335) as the threshold value Th of the determinating reference of carrying out forced retransmission.
Then, judge whether SIR＜Th sets up (step 334), under the situation that SIR＜Th sets up, send re-send request may signal 33a, make forced retransmission carry out (step 336) to retransmitting control part 104.
In addition, also can be after above-mentioned steps 331 have just been finished, read the horizontal information of the urgency relevant immediately with sending data 12 from QoS information 32a, under the high situation of urgency, also can omit the processing from step 332 to step 334, direct descendant carries out forced retransmission to step 336 and handles.
Thus, under the situation of present embodiment 2, according to the SIR information 51 that comprises the control information 50 of replying from receiving system 200 sides, determine whether to carry out forced retransmission, so under the situation in good condition of and radiolink big at SIR, useless forced retransmission can be suppressed and transmitted power can be reduced, and, can carry out and the corresponding suitable forced retransmission of real-time that sends data 12.
(execution mode 3)
Figure 18 is the block diagram of structure example that the dispensing device of embodiments of the present invention 3 is shown.With the main difference part of execution mode 1 be the processing of latency function portion 105, the structure of receiving system 200 is identical with execution mode 1.
In the present embodiment, import SIR information 51 from control signal lsb decoder 111 to latency function portion 105.Then, be made as in latency function portion 105 time interval T till can changing according to the SIR of the grouping in past when forced retransmission.
That is, from transmission buffer 101 to retransmitting control part 104 inputs when sending notification signals 32, retransmit control part 104 to latency function portion 105 input re-send request may signals, 33 (steps 341).
At this moment, latency function portion 105 obtains the SIR information 51 (step 342) of reflection transmission path situation before from control signal lsb decoder 111.
Then, judge whether SIR＜Th sets up (step 343), under the situation that SIR＜Th sets up, time interval T is increased constant basis τ and make forced retransmission carry out (step 345), under the invalid situation of SIR＜Th, time interval T is reduced constant basis τ and make forced retransmission carry out (step 344).
Thus, can change time interval T till forced retransmission according to SIR information 51 by being made as, thus can be in the best forced retransmission that regularly carry out forced retransmission grouping 10R corresponding with the transmission path situation of SIR information 51 expressions.
Figure 20 is the block diagram of structure that the variation of the dispensing device 100 in the present embodiment 3 is shown.In this case, between latency function portion 105 and transmit frame control information 11, be provided with ACK/NACK buffer 122.In this ACK/NACK buffer 122, store each frequency by control signal lsb decoder 111 decoded ack signals 41 and NACK signal 42.
Then, latency function portion 105 obtains the information of the generation frequency of NACK signal 42 in the past, i.e. repeating transmission generation frequency from ACK/NACK buffer 122.Repeating transmission in the past produces under the low situation of frequency, shortens the time interval T till forced retransmission, and then the reduction of reaching retransmission delay.Produce under the high situation of frequency retransmitting on the contrary, time expand interval T, reach diversity.Figure 21 is the flow chart that this situation is shown.Illustrate herein and use threshold value Th (threshold) to judge the example of retransmitting the generation frequency.
That is, from transmission buffer 101 to retransmitting control part 104 inputs when sending notification signals 32, retransmit control part 104 to latency function portion 105 input re-send request may signals, 33 (steps 351).
At this moment, by the time function portion 105 is from the retransmission of information (step 352) of ACK/NACK buffer 122 n of obtaining over groupings (frames), calculates frame number (number of times of NACK the signal 42)/n (step 353) of repeating transmission generation Probability p=retransmit.
Then, judge whether p＞Th sets up (step 354), under the situation that p＞Th sets up, time interval T is increased constant basis τ make forced retransmission carry out (step 356), under the invalid situation of p＞Th, time interval T is reduced constant basis τ make forced retransmission carry out (step 355).
Thus, can change time interval T till forced retransmission according to retransmit producing frequency, thereby can produce the corresponding best forced retransmission of regularly carrying out forced retransmission grouping 10R of transmission path situation that frequency is represented with retransmitting by being made as.
Figure 22 is the block diagram that another variation of the dispensing device 100 in the present embodiment 3 is shown.In this case, from retransmission buffer 102 to the relevant QoS information 32a of latency function portion 105 input and transmission data 12.
That is, from transmission buffer 101 to retransmitting control part 104 inputs when sending notification signals 32, retransmit control part 104 to latency function portion 105 input re-send request may signals, 33 (steps 361).
At this moment, latency function portion 105 is according to the QoS information 32a from transmission buffer 101 inputs, whether the transmission data of differentiating in this transmission buffer 101 12 are real time data (step 362), sending data 12 is under the situation of real time data, time interval T is reduced constant basis τ (step 364) forced retransmission is carried out, under the situation that is not real time data, time interval T is reduced constant basis τ and make forced retransmission carry out (step 363).
Thus, by will the time interval T till forced retransmission according to the QoS such as real-time that send data 12 needs being controlled to be variablely, can realize being suitable for the repeating transmission control of QoS.
Each execution mode according to above explanation plays following effect.
(1) in dispensing device 100, after sending grouping 10, do not wait for RTT and carry out the forced retransmission of forced retransmission grouping 10R.Therefore retransmitting number of times increases fast, is complementary by the synthetic advantage (synthesizing of the signal level of the grouping 10 of mistake and forced retransmission grouping 10R) with HARQ, and the possibility that sends successfully (ACK) more quickly uprises.Its result can reduce retransmission delay.Effective in the system that determines maximum retransmission time of delay and maximum number of retransmissions especially.
(2) after sending grouping 10, at the possibility of its repeating transmission, after predicting, determine whether to carry out the forced retransmission of forced retransmission grouping 10R, so can reduce useless repeating transmission, reduce transmitted power.
(3) can change threshold value Th according to grouping 10 instantaneity, so, can reduce the processing delay when retransmitting by in real time data etc., preferentially carrying out forced retransmission as the benchmark that is used to carry out forced retransmission.
(4) under the situation about retransmitting, though waste some transmitted powers, force repeatedly to retransmit, so can improve retransmission delay owing to not predicting not predicting.
(5) after sending grouping 10, can wait the time interval T that changes till the forced retransmission of carrying out forced retransmission grouping 10R, thereby can obtain the time diversity effect simultaneously and reduce processing delay according to situation, the repeating transmission generation frequency of transmission path by being made as.
Utilizability on the industry
According to the present invention, can shorten the retransmission delay time in the repeating transmission control of communication data.
In addition, reduce in the more serious communication network, can realize radio communication based on the repeating transmission control of communication data at the traffic rate that propagation delay causes, and the reduction that can not produce communication speed speed.
In addition, the invention is not restricted to the structure shown in the example in the above-mentioned execution mode, can in the scope that does not break away from its main idea, carry out various changes certainly.
For example, be not limited to radio communication, can be widely used in the retransmission technique among ARQ, the HARQ etc. of general wire communication.
Claims (3)
1. a wireless communication system of retransmitting control between dispensing device and receiving system is characterized in that,
Described dispensing device has:
Transmitting element, it sends communication data to receiving system;
Retransmit control unit, it is not waited for the relevant negative acknowledgement of described communication data and arriving from described receiving system, promptly send the data division data identical, wait for the data division data identical relevant negative acknowledgement or affirmation answer signal arriving with described communication data with described communication data to described receiving system; And
Receiving element, it receives same data division data relevant negative acknowledgement or the affirmation answer signal identical with described communication data of replying from described receiving system,
Described receiving system has transmitting element, and described transmitting element sends with the data division data identical with described communication data relevant negative acknowledgement or affirmation answer signal to described dispensing device.
2. wireless communication system according to claim 1 is characterized in that, described repeating transmission control unit is carried out the repeating transmission about described communication data according to the reception with the relevant negative acknowledgement of the data division data identical with described communication data.
3. the wireless communications method in the wireless communication system of retransmitting control between dispensing device and receiving system is characterized in that,
In described dispensing device,
Send communication data to receiving system;
Do not wait for the relevant negative acknowledgement of described communication data and arriving from described receiving system, promptly send the data division data identical, wait for the data division data identical relevant negative acknowledgement or affirmation answer signal arriving with described communication data with described communication data to described receiving system;
Described receiving system sends with the data division data identical with described communication data relevant negative acknowledgement or affirmation answer signal,
Described dispensing device receives same data division data relevant negative acknowledgement or the affirmation answer signal identical with described communication data that sends from described receiving system.
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| CN103595510A (en) * | 2013-12-03 | 2014-02-19 | 北京旋极信息技术股份有限公司 | Wireless data transmission method, host computer and slave computers |
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| CN103595510A (en) * | 2013-12-03 | 2014-02-19 | 北京旋极信息技术股份有限公司 | Wireless data transmission method, host computer and slave computers |
| CN103595510B (en) * | 2013-12-03 | 2017-02-15 | 北京旋极信息技术股份有限公司 | Wireless data transmission method, host computer and slave computers |
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Application publication date: 20110413 |