CN1881864A - Method for improving sending end throughput of wireless channel - Google Patents
Method for improving sending end throughput of wireless channel Download PDFInfo
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- CN1881864A CN1881864A CN 200510077114 CN200510077114A CN1881864A CN 1881864 A CN1881864 A CN 1881864A CN 200510077114 CN200510077114 CN 200510077114 CN 200510077114 A CN200510077114 A CN 200510077114A CN 1881864 A CN1881864 A CN 1881864A
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Abstract
The invention relates to a method for improving the throughout of sending terminal of wireless signal channel, wherein it comprises: setting preset time at the sending terminal; when meeting the time length of preset time and needing to send data to the receiving terminal again, the sending terminal retransmits the data. With said invention, the retransmission of ineffective data pack at the sending terminal can be avoided, to improve the bandwidth utilization of wireless signal channel and improve the effective throughout of sending terminal.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of method that improves the transmitting terminal throughput of wireless channel.
Background technology
3GPP (third generation partner program) is a consortium of being made up of the telecommunication standard department from China, Japan, Korea S, US and European.Comprise the whole world more than 200 tame wireless manufacturer and operators, 3GPP will formulate most 3G (3G (Third Generation) Moblie) technical stipulation.China Wireless Telecommunication Standar group (CWTS) has added 3GPP in 1999.The target of 3GPP is to realize being seamlessly transitted to 3G network by 2G (second generation mobile communication) network, guarantees the backwards compatibility of WeiLai Technology, supports roaming and compatibility between light networking and system.
Compare with the wireless system of 2G, one of WCDMA (Wideband Code Division Multiple Access (WCDMA)) system features is the radio bearer that the high-speed data service transmission can be provided.WCDMA can be the channel of transfer of data configuration different bandwidth by using the spreading factor of different sizes, and the carrying of the wireless channel on eating dishes without rice or wine is provided.
Based on the 3GPP agreement, at the RLC of WCDMA system (Radio Link control) layer, for transfer of data provides three kinds of pattern: TM (transparent mode), UM (unacknowledged mode) and AM (answer-mode).Non real-time transfer of data is not because its time delay influences, and error rate requires generally all to use the AM pattern than higher.
In the AM data-transmission mode, in order to guarantee the accuracy of transfer of data, agreement provides various affirmation mechanisms to the AM pattern.Its essential idea is: after transmitting terminal issues a packet, do not abandon this packet at once, but this packet elder generation buffer memory is got up.Receiving terminal is to transmitting terminal send state information bag, in this state information bag, tell whether transmitting terminal has correctly received packet, if receiving terminal tells transmitting terminal correctly to receive packet, then transmitting terminal abandons this packet in the state information bag.If receiving terminal tells transmitting terminal correctly not receive packet in the state information bag, then transmitting terminal is retransmitted this packet.
In order to realize above-mentioned packet affirmation mechanism, a kind of confirmation method of prior art is an initiatively triggering method of transmitting terminal.The principle schematic of this method as shown in Figure 1, the core of this method is: transmitting terminal initiatively issues the poll training in rotation to receiving terminal, and receiving terminal receives the poll training in rotation at every turn, all can be to the transmitting terminal status report, in this status report, tell whether transmitting terminal has correctly received packet.Certain packet of indication does not receive that transmitting terminal will preferentially send this packet that indication is lost in the status report that transmitting terminal is received.
The transmitting terminal of the described prior art initiatively shortcoming of triggering method is: if the time interval of twice status report that receiving terminal returns is too short, the packet that the transmitting terminal transmission will occur is not lost in fact, but because the time delay of transmission, a period of time of having delayed time just arrives receiving terminal, but at this section in the period, receiving terminal but repeatedly receives transmitting terminal to the poll of its transmission training in rotation, and repeatedly to the transmitting terminal status report, these status reports are all indicated and do not received this packet.Repeat to have sent repeatedly thereby cause this packet to be sent out end, will cause valid data in time not sent like this, reduced the throughput of transmitting terminal.
Describe this packet in detail by the process that repeatedly repeats to send below with reference to Fig. 2.
In Fig. 2, transmitting terminal is lost to the packet 2 that receiving terminal sends, transmitting terminal has all carried the Poll information that requires the receiving terminal status report in the packet 3,4,5,6 that receiving terminal sends, like this, receiving terminal will be continuously to transmitting terminal status report 1,2,3,4, and each status report is all lost to sender report packet 2.So, will repeat to send packet 2 continuous 4 times at receiving terminal.In the packet 2 that receiving terminal repeats to send for 4 times, except the packet 2 that repeats to send for the 1st time effectively, all the other 3 packets that repeat to send 2 all are invalid.Thereby cause the bandwidth of wireless channel to be wasted, other valid data that need send are not in time sent, and have reduced the throughput of transmitting terminal application layer.
Summary of the invention
In view of above-mentioned existing in prior technology problem, the purpose of this invention is to provide a kind of method that improves the transmitting terminal throughput of wireless channel, thereby can avoid the transmitting terminal of wireless channel to retransmit invalid data packets, improve the effective throughput of the transmitting terminal of wireless channel.
The objective of the invention is to be achieved through the following technical solutions:
A kind of method that improves the transmitting terminal throughput of wireless channel comprises:
A, be set the scheduled time at the transmitting terminal of wireless channel;
B, after meeting the duration of the described scheduled time, when determine needing again when receiving terminal transmits data, then the transmitting terminal of wireless channel carries out the re-transmission of data.
The time of the duration of the described scheduled time loopback that is packet between the transmitting terminal of wireless channel and receiving terminal.
Describedly the scheduled time is set realizes by timer or timer or counter.
Described steps A also comprises:
The transmitting terminal of wireless channel when receiving terminal retransmits a packet, starts the timing of the described scheduled time at every turn behind the status report that receives the report data packet loss.
Described steps A also comprises:
The transmitting terminal of wireless channel when receiving terminal sends a packet, does not start the timing of the described scheduled time for the first time.
Described step B also comprises:
The transmitting terminal of wireless channel if receive the status report of the data-bag lost of the described re-transmission of report, then no longer retransmits this packet before the duration of the described scheduled time arrives.
Described step B specifically comprises:
The transmitting terminal of wireless channel if receive the status report of the data-bag lost of the described re-transmission of report, then retransmits this packet to receiving terminal once more, and starts the timing of the described scheduled time once more after the duration of the described scheduled time arrives.
Described step B specifically comprises:
The transmitting terminal of wireless channel if do not receive the status report of the data-bag lost of the described re-transmission of report, does not then retransmit this packet to receiving terminal after the duration of the described scheduled time arrives.
Described wireless channel carries out the wireless channel of transfer of data for using answer-mode AM.
Described wireless channel can be the wireless channel of Radio Link control rlc layer in the Wideband Code Division Multiple Access (WCDMA) WCDMA system.
As seen from the above technical solution provided by the invention; the present invention compares with prior art; have following advantage: the present invention is provided with re-transmission protection timer at the transmitting terminal of wireless channel; utilize the transmitting terminal of this re-transmission protection timer control wireless channel to retransmit invalid data packets; valid data can in time be sent out; thereby improved the bandwidth availability ratio of wireless channel, improved the effective throughput of the transmitting terminal of wireless channel.
Description of drawings
Fig. 1 initiatively triggers the principle schematic of confirmation method for transmitting terminal in the prior art;
The process schematic diagram that Fig. 2 is repeatedly repeated to send for packet in the prior art;
Fig. 3 is the concrete process chart of the method for the invention;
Fig. 4 is the specific embodiment schematic diagram of the method for the invention.
Embodiment
The invention provides a kind of method that improves the transmitting terminal throughput of wireless channel.Core of the present invention is: the transmitting terminal at wireless channel is provided with the protection timer, utilizes the transmitting terminal of this protection timer control wireless channel to retransmit invalid data packets.
Describe the present invention in detail below in conjunction with accompanying drawing, the concrete handling process of the method for the invention as shown in Figure 3.Comprise the steps:
Step 3-1, in the AM of transmitting terminal parameter, be provided with and retransmit the protection timer.
The present invention at first need be provided with in the AM parameter of the transmitting terminal of the wireless channel of using the AM data-transmission mode and retransmit the protection timer, and it is the time of packet at the transmitting terminal and a loopback of receiving terminal of wireless channel that length of timer is protected in this re-transmissions.
When step 3-2, transmitting terminal retransmit a packet at every turn, start one and retransmit the protection timer.
The transmitting terminal of wireless channel when receiving terminal sends a packet, does not start the described re-transmission protection timer that is provided with at transmitting terminal for the first time.
The transmitting terminal of wireless channel is being received what receiving terminal returned, comprise the status report that packet correctly do not received information after, retransmit this packet to receiving terminal, and start a described re-transmission protection timer that is provided with at transmitting terminal simultaneously.
Step 3-3, transmitting terminal judge whether re-transmission protection timer is overtime.
The transmitting terminal of wireless channel at the retransmission data bag, start to retransmit the protection timer after, continuing when transmitting terminal sends other packet, judge also whether the re-transmission protection timer that is started overtime, if overtime, execution in step 3-5 then; Otherwise, execution in step 3-4.
Step 3-4, transmitting terminal are ignored to the status report that this packet that receives is not correctly received.
The transmitting terminal of wireless channel retransmit the protection timer do not have overtime before; if receive what receiving terminal returned once more; after the packet that comprises described re-transmission is not correctly received the status report of information, judge that just this status report is an invalid report, ignores to this report.Continuation sends other packet to receiving terminal.
Step 3-5, transmitting terminal are retransmitted this packet after receiving the status report that this packet correctly do not received once more.
The transmitting terminal of wireless channel is after retransmitting the protection timer expiry; if receive what receiving terminal returned once more; after the packet that comprises described re-transmission is not correctly received the status report of information; just judge that this status report is an effectively report; so; retransmit this packet to receiving terminal once more, and start a re-transmission protection timer once more.
The transmitting terminal of wireless channel is not correctly received the status report of information if receive the packet that comprises described re-transmission after retransmitting the protection timer expiry, then do not retransmit this packet to receiving terminal yet.
Wireless channel in the method for the invention can be the wireless channel of the use AM data-transmission mode of rlc layer in the WCDMA system.
The present invention also provides the specific embodiment an of the method for the invention.Its schematic diagram as shown in Figure 4.
Its concrete processing procedure is as follows: the transmitting terminal of wireless channel is lost to the packet 2 that receiving terminal sends, the transmitting terminal of wireless channel has all carried the Poll information that requires the receiving terminal status report in the packet 3,4,5,6 that receiving terminal sends, like this, receiving terminal will be continuously to transmitting terminal status report 1,2,3,4, and each status report is all lost to sender report packet 2.
The transmitting terminal of wireless channel just knows that according to this status report packet 2 is lost after receiving status report 1.So,, start one simultaneously and retransmit the protection timer to receiving terminal retransmission data bag 2.This re-transmission protection length of timer is the time of packet at the transmitting terminal and a loopback of receiving terminal of wireless channel.
Before this retransmitted the protection timer expiry, the transmitting terminal of wireless channel had been received the status report 2,3 and 4 that report data bag 2 is not correctly received again respectively.At this moment, the transmitting terminal of wireless channel judges that just status report 2,3 and 4 is invalid report, also no longer continues the receiving terminal retransmission data bag 2 to wireless channel, but continues to send packet 8,9,10 to the receiving terminal of wireless channel.
The transmitting terminal of wireless channel is after retransmitting the protection timer expiry; if receive what receiving terminal returned once more; after comprising the status report that packet 2 correctly do not received information; just judge that this status report is an effectively report; so; retransmit this packet 2 to receiving terminal once more, and start a re-transmission protection timer once more.If do not receive to comprise the status report that packet 2 is not correctly received information, then do not retransmit this packet 2 yet to receiving terminal.
In sum, utilize the method for the invention, can avoid the transmitting terminal of wireless channel to retransmit invalid packets, improved the effective throughput of the transmitting terminal of wireless channel.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (10)
1, a kind of method that improves the transmitting terminal throughput of wireless channel is characterized in that, comprising:
A, be set the scheduled time at the transmitting terminal of wireless channel;
B, after meeting the duration of the described scheduled time, when determine needing again when receiving terminal transmits data, then the transmitting terminal of wireless channel carries out the re-transmission of data.
2, according to the described a kind of method that improves the transmitting terminal throughput of wireless channel of claim 1, it is characterized in that the time of the duration of the described scheduled time loopback that is packet between the transmitting terminal of wireless channel and receiving terminal.
3, according to claim 1 or 2 described a kind of methods that improve the transmitting terminal throughput of wireless channel, it is characterized in that, describedly the scheduled time is set realizes by timer or timer or counter.
4, according to the described a kind of method that improves the transmitting terminal throughput of wireless channel of claim 3, it is characterized in that described steps A also comprises:
The transmitting terminal of wireless channel when receiving terminal retransmits a packet, starts the timing of the described scheduled time at every turn behind the status report that receives the report data packet loss.
5, according to the described a kind of method that improves the transmitting terminal throughput of wireless channel of claim 4, it is characterized in that described steps A also comprises:
The transmitting terminal of wireless channel when receiving terminal sends a packet, does not start the timing of the described scheduled time for the first time.
6, according to the described a kind of method that improves the transmitting terminal throughput of wireless channel of claim 1, it is characterized in that described step B also comprises:
The transmitting terminal of wireless channel if receive the status report of the data-bag lost of the described re-transmission of report, then no longer retransmits this packet before the duration of the described scheduled time arrives.
7, according to claim 1 or 6 described a kind of methods that improve wireless channel transmitting terminal throughput, it is characterized in that described step B specifically comprises:
The transmitting terminal of wireless channel if receive the status report of the data-bag lost of the described re-transmission of report, then retransmits this packet to receiving terminal once more, and starts the timing of the described scheduled time once more after the duration of the described scheduled time arrives.
8, according to the described a kind of method that improves wireless channel transmitting terminal throughput of claim 7, it is characterized in that described step B specifically comprises:
The transmitting terminal of wireless channel if do not receive the status report of the data-bag lost of the described re-transmission of report, does not then retransmit this packet to receiving terminal after the duration of the described scheduled time arrives.
According to the described a kind of method that improves wireless channel transmitting terminal throughput of claim 1, it is characterized in that 9, described wireless channel carries out the wireless channel of transfer of data for using answer-mode AM.
According to claim 1 or 9 described a kind of methods that improve wireless channel transmitting terminal throughput, it is characterized in that 10, described wireless channel can be the wireless channel of Radio Link control rlc layer in the Wideband Code Division Multiple Access (WCDMA) WCDMA system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510077114 CN1881864A (en) | 2005-06-14 | 2005-06-14 | Method for improving sending end throughput of wireless channel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510077114 CN1881864A (en) | 2005-06-14 | 2005-06-14 | Method for improving sending end throughput of wireless channel |
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| CN1881864A true CN1881864A (en) | 2006-12-20 |
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| CN 200510077114 Pending CN1881864A (en) | 2005-06-14 | 2005-06-14 | Method for improving sending end throughput of wireless channel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010022665A1 (en) * | 2008-09-01 | 2010-03-04 | 华为技术有限公司 | Method, device and system for implementing retransmission in physical layer |
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- 2005-06-14 CN CN 200510077114 patent/CN1881864A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010022665A1 (en) * | 2008-09-01 | 2010-03-04 | 华为技术有限公司 | Method, device and system for implementing retransmission in physical layer |
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