CN100421413C - Method for adjusting size of transmission buffer in control sub layer of wireless link - Google Patents
Method for adjusting size of transmission buffer in control sub layer of wireless link Download PDFInfo
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- CN100421413C CN100421413C CNB2004101028392A CN200410102839A CN100421413C CN 100421413 C CN100421413 C CN 100421413C CN B2004101028392 A CNB2004101028392 A CN B2004101028392A CN 200410102839 A CN200410102839 A CN 200410102839A CN 100421413 C CN100421413 C CN 100421413C
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/90—Buffering arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/90—Buffering arrangements
- H04L49/9023—Buffering arrangements for implementing a jitter-buffer
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Abstract
The present invention provides a method for regulating the size of a cache transmitted by a wireless link controlling sublayer, which has the key that the transmission delay of an air interface of a wireless communicatiom network is detected, and the size of a cache transmitted by the wireless link controlling sublayer is regulated according to the transmission delay of the air interface. The present invention can dynamicaly and reasonably regulate the space for transmitting a cache by the wireless link controlling sublayer according to the transmission delay of the air interface; one hand, a data throughput decrease of the air interface and a dithering phenomenon caused by the undersize transmission cache can be avoided; on the other hand, the resource waste of the memory of the wireless link controlling sublayer and the phenomenon of an artificial increase of data transmission delay caused by the oversize transmission cache can be avoided. The present invention sufficiently ensures the throughput rate of the air interface, and simultaneously saves the resources of the memory of the wireless link controlling sublayer and increases the data transmission rate; consequently, the present invention realizes the goals of saving the resources of a communication system and improving the performance of a communication system.
Description
Technical field
The present invention relates to the network communications technology field, be specifically related to the method for adjustment that a kind of control sub layer of wireless link sends cache size.
Background technology
In UTRAN (Universal Terrestrial Radio Access Network universal terrestrial access network), for guaranteeing the reliable transmission of data, RLC (Radio Link control) sublayer tends to adopt AM (Acknowledged Mode affirmation mode) to carry out transfer of data, and its work schematic diagram as shown in Figure 1.
In Fig. 1, the upper strata transfers to its corresponding sending entity with PDU, and PDU can be described as SDU (service data unit) for sending entity.After the PDU that sending entity comes upper strata transmission is assembled into AMD (acknowledged mode data) PDU, is stored in earlier and sends in buffer memory such as the transmission buffer, then, the wireless channel by bottom transfers to corresponding receiving entity.Sending entity is after receiving the status report that the opposite end is the next correct reception of receiving entity transmission, according to the AMD PDU deletion of loaded information in the status report with corresponding stored in the transmission buffer.
Because the air interface propagation delay time of wireless network is big, characteristics such as error rate height, when the data of sending entity transmission can't in time obtain the affirmation of receiving entity, the new data packets that the upper strata transmission comes just can only be stored in sending entity RLC sublayer and send in the buffer memory.If what application layer was used is Transmission Control Protocol, slow Initiated Mechanism according to TCP: TCP sends during the data exponential increase, the data volume that the RLC sublayer receives from the upper strata can cause more data to be stranded in the RLC sublayer equally and send in the buffer memory greater than the transmitting capacity of itself.When TCP sends the data linear growth, TCP receives that whenever an affirmation can only send a message segment, at this moment, the RLC sublayer causes the RLC sublayer to send the data that can be detained some in the buffer memory all the time from upper strata rate of received data and RLC sublayer transmission rate basically identical.
The size that the RLC sublayer sends buffer memory rationally is set, and is very important.It is too little that the RLC sublayer sends the buffer memory setting, when wireless network air interface propagation delay time is big, can cause the air interface throughput to descend and shake; It is too big that the RLC sublayer sends the buffer memory setting, then can cause the waste of RLC memory source, what is more important, it is too big to send the buffer memory setting, the throughput of air interface is not only improved, and carries out 2 transmissions because the data of application layer are temporarily stored in the RLC sublayer, can artificially increase data transmission delay on the contrary.
The relation of the RLC sublayer transmission cache size of emulation and air interface data throughput, transfer of data time-delay as shown in Figure 2.
In Fig. 2, trunnion axis sends cache size for the RLC sublayer, and the left vertical axle is the air interface data throughput, and the right side vertical axis is the data packet transmission time delay.Below from figure in two curves a curve as can be known, when assignment speed is 384k bit, RLC sublayer when sending buffer memory greater than the 48k bit, data transmission delay can sharply rise, but the air interface data throughput does not obtain too big improvement.
Simultaneously, when sending excessive that buffer memory is provided with in the RLC sublayer, when if network or user need stop current business immediately or initiate new service request, the RLC sublayer sends FIFO (the First In First Out first in first out) mechanism of buffer memory, can cause stopping to ask or new service request can't be responded timely.
At present, the control method that the RLC sublayer is sent cache size is mainly: according to 3GPP (3rdGeneration Partnership Project, third generation partner program) agreement, the RLC sublayer can dispose the overtime time that abandons that abandons, if the data of storing in the i.e. RLC sublayer transmission buffer memory are surpassing the time that abandons, also do not send, then abandon these data, thereby can not be provided with excessive by abandoning time control RLC sublayer transmission buffer memory.
But, because abandoning the time is a quiescent value by protocol definition, and must when setting up, business specify, and that the RLC sublayer sends in the buffer memory data quantity stored and wireless network air interface propagation delay time is closely related, if adopt a static numerical value that the size that the RLC sublayer sends buffer memory is set, can occur still that the air interface data throughput descends, shake or waste memory source, artificially increase phenomenon such as data transmission delay.
In sum, existing this RLC sublayer sends the control method of cache size can't rationally adjust the size that the RLC sublayer sends buffer memory, and telecommunication system resources can not be effectively saved in existence, can not effectively improve shortcomings such as communication system performance.
Summary of the invention
The objective of the invention is to, provide a kind of control sub layer of wireless link to send the method for adjustment of cache size, send cache size by come dynamically, rationally to adjust control sub layer of wireless link according to the air interface propagation delay time, realize the saving telecommunication system resources, improved the purpose of communication system performance.
For achieving the above object, a kind of control sub layer of wireless link provided by the invention sends the method for adjustment of cache size, comprising:
A, the time and the described sending entity that receive the data that corresponding upper transmission comes according to the control sub layer of wireless link sending entity receive these data that the opposite end transmission comes have been determined cordless communication network by the time difference of the status report of the correct reception in opposite end air interface propagation delay time;
B, adjust the size that control sub layer of wireless link sends buffer memory according to described air interface propagation delay time.
Described step a further comprises:
Described sending entity is determined the air interface propagation delay time according to the Loop Round Trip Time mean value of the data of predetermined number, and the Loop Round Trip Time of described data is described time difference.
Described data comprise: service data unit.
Described step a further comprises:
Described sending entity recorder is to the time of the next service data unit of its corresponding upper transmission;
The status report loaded information that described sending entity comes according to the opposite end transmission is determined by the service data unit of the complete correct reception in opposite end, and recorder is to the time of corresponding status report;
Described sending entity is at the service data unit of determining predetermined number during by complete correct receptions in opposite end, according to described each service data unit writing time, the average Loop Round Trip Time that described predetermined number is determined service data unit of correspondence respectively;
Described average Loop Round Trip Time is defined as the air interface propagation delay time.
Described method also comprises: obtain described sending entity and the professional maximum rate of interlayer on it;
And described step b further comprises:
Product according to described professional maximum rate and air interface propagation delay time is adjusted the size that control sub layer of wireless link sends buffer memory.
Described method also comprises: the time delay scale factor is set;
And described step b further comprises:
Product according to described professional maximum rate, time delay scale factor and air interface propagation delay time is adjusted the size that control sub layer of wireless link sends buffer memory.
Description by technique scheme as can be known, the present invention dynamically adjusts the size that control sub layer of wireless link sends buffer memory according to the air interface propagation delay time, when aloft the interface propagation delay time is big, can be corresponding the increase control sub layer of wireless link send the space of buffer memory, having avoided sending buffer memory is provided with too small and decline of air interface throughput and jitter phenomenon that cause, interface propagation delay time hour aloft, can correspondingly reduce to send the space of buffer memory, avoid sending buffer memory and be provided with excessive and control sub layer of wireless link memory source waste that cause, the artificial phenomenon that increases the data transmission delay; By being determined the air interface propagation delay time by the Loop Round Trip Time of the service data unit of complete, correct reception, make the method that detects the air interface propagation delay time be easy to realize; Determine to send the size of buffer memory by professional maximum rate, time delay scale factor, the average Loop Round Trip Time that is transferred to sending entity according to the upper strata, make the size that sends buffer memory obtain rational setting, make the present invention when guaranteeing the air interface data throughput, avoided the control sub layer of wireless link memory source to waste, artificially increase the phenomenon of data transmission delay; Thereby realized saving control sub layer of wireless link memory source by technical scheme provided by the invention, improved the purpose of communication system performance.
Description of drawings
Fig. 1 is the RLC AM pattern work schematic diagram of prior art;
Fig. 2 is that the RLC sublayer of emulation sends the schematic diagram that concerns that cache size and air interface data throughput, transfer of data delay time;
Fig. 3 is the control method flow chart of the transmission cache size of Radio Link control of the present invention.
Embodiment
The air interface propagation delay time of wireless network generally can be along with error code, the variation of factors such as transmission bearer and constantly changing, because control sub layer of wireless link sends the air interface propagation delay time be buffered in wireless network when big, can store lot of data, in the air interface propagation delay time of wireless network hour, the corresponding minimizing of data meeting of its storage, so, if come corresponding adjustment control sub layer of wireless link to send the size of buffer memory according to the air interface propagation delay time, then can effectively avoid the air interface data throughput to descend, shake, waste control sub layer of wireless link memory source, phenomenons such as artificial increase data transmission delay.Therefore, core of the present invention is: detect the air interface propagation delay time of wireless network, adjust the size that control sub layer of wireless link sends buffer memory according to described air interface propagation delay time.
Based on core concept of the present invention technical scheme provided by the invention is further described below.
The present invention detects the air interface propagation delay time and can determine by obtaining the data Loop Round Trip Time, and the data Loop Round Trip Time can receive time of the data that upper strata transmission comes and sending entity by sending entity and receive the difference of the time of the status report that these data that the opposite end transmission comes have correctly been received and determine.
Be the sudden fluctuation of avoiding the air interface propagation delay time, the frequent size that sends buffer memory of adjusting, the present invention adopts the mean value of the data Loop Round Trip Time of predetermined number to determine the air interface propagation delay time of wireless network in a period of time.
Data Loop Round Trip Time with service data unit is that example describes method of the present invention below.
Sending entity is when receiving the SDU that upper strata transmission comes, and recorder is to the time of this SDU, and sending entity is when receiving the receiving state report that the opposite end transmission comes, and recorder is to the time of this receiving state report.
Sending entity judges whether to exist a complete SDU correctly to be received by the opposite end according to loaded information such as sequence number etc. in the receiving state report, if when having a complete SDU by the complete correct reception in opposite end, sending entity can according to record should the correct SDU that receives two times poor, obtain this correct SDU Loop Round Trip Time that receives.The present invention can be according to predetermined number determined the air interface propagation delay time by the mean value of the SDU Loop Round Trip Time of the complete correct reception in opposite end.Predetermined number can be determined according to the actual conditions of communication system.
After having determined the air interface propagation delay time, can be according to the unique predetermined value of determining a correspondence of air interface propagation delay time, this predetermined value is the size of the transmission buffer memory in the sending entity of RLC sublayer, according to this predetermined value the size that sends buffer memory is adjusted.
According to the method for the unique predetermined value of determining a correspondence of air interface propagation delay time can for: determine the upper strata of sending entity and the professional maximum rate between the sending entity, transfer of data is arrived the professional maximum rate of RLC sublayer sending entity as the upper strata, professional maximum rate and air interface propagation delay time are multiplied each other, the numerical value that obtains promptly can be adjusted the size that sends buffer memory as the size of the transmission buffer memory of sending entity according to this numerical value.
Consider the data transmission delay of cable network, the present invention can also be provided with the time delay scale factor, professional maximum rate, time delay scale factor and air interface propagation delay time are multiplied each other, the numerical value that obtains is adjusted the size that the RLC sublayer sends buffer memory as the size of the transmission buffer memory of sending entity according to this numerical value.
The present invention can define at every turn predetermined number by the SDU of the complete correct reception in opposite end the time, adjust the size that the RLC sublayer sends buffer memory, like this, the memory space that can make the RLC sublayer send buffer memory can obtain according to the air interface propagation delay time in a period of time dynamically, rationally be provided with, avoided the RLC sublayer to send buffer memory on the one hand and be provided with too small and decline of air interface throughput and jitter phenomenon that cause, avoided the RLC sublayer to send buffer memory on the other hand and be provided with excessive and control sub layer of wireless link memory source waste that cause, the artificial phenomenon that increases the data transmission delay.
The method of adjustment that sends cache size below in conjunction with 3 couples of RLC of the present invention of accompanying drawing sublayer is elaborated.
In Fig. 3, step 300 is provided with time delay scale factor Factor, obtains professional maximum rate MaxRate and predetermined number WindowSize that the upper strata is transferred to sending entity.Begin to be the predetermined number numeration, if use register, then the register of predetermined number resets, and the initial value of setting register is a predetermined number.
To step 310, when the RLC sublayer receives the SDU that the upper strata transmission comes, the record current time, i.e. ReceiveTime (m), wherein m represents m the SDU that RLC sublayer sending entity receives.The RLC sublayer is assembled into SDU the RLC sublayer receiving entity that transfers to the opposite end behind the AMD PDU by bottom according to the protocol operation step.When RLC sublayer sending entity receives the receiving state report of opposite end receiving entity transmission, to step 320, judge whether to exist a complete SDU to be received according to loaded information in the receiving state report such as sn (sequence number) by the opposite end, if there is no a complete SDU is correctly received by the opposite end, continuation is judged the receiving state report that RLC sublayer sending entity receives, up to determining to exist a complete SDU correctly to be received by the opposite end.
To step 330, sending entity record in RLC sublayer receives that sequence number is the time of sn receiving state report, i.e. ConfirmTime (n), and wherein n represents that RLC sublayer sending entity receives the status report of n the complete correct reception that the opposite end transmission comes.
To step 340, RLC sublayer sending entity is determined the corresponding SDU of ConfirmTime (n), determines that again sending entity receives the time that this SDU is transmitted on the upper strata, sets it and is ReceiveTime (n), calculates both time difference Delta (n):
Delta(n)＝ConfirmTime(n)-ReceiveTime(n)
Simultaneously, the counter value of register reduces 1.
To step 350, judge whether the counter value of register is 0, if counter value is not 0, continue counter value is judged, be 0 up to counter value, to step 360, calculate the average Loop Round Trip Time AverageTime of the SDU of predetermined number, that is:
To step 370, calculate predetermined value MaxBuffer, promptly
MaxBuffer=MaxRate * Factor * AverageTime, and adjust the size that RLC sublayer sending entity sends buffer memory according to MaxBuffer.Register resets, and restarts to be the predetermined number numeration.To step 320,, continue the receiving state report that RLC sublayer sending entity receives is judged that beginning RLC sublayer next time sends the adjustment process of cache size.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, and the claim of application documents of the present invention comprises these distortion and variation.
Claims (8)
1. the method for adjustment of a control sub layer of wireless link transmission cache size is characterized in that, comprising:
A, the time and the described sending entity that receive the data that corresponding upper transmission comes according to the control sub layer of wireless link sending entity receive these data that the opposite end transmission comes have been determined cordless communication network by the time difference of the status report of the correct reception in opposite end air interface propagation delay time;
B, adjust the size that control sub layer of wireless link sends buffer memory according to described air interface propagation delay time.
2. a kind of control sub layer of wireless link as claimed in claim 1 sends the method for adjustment of cache size, it is characterized in that described step a further comprises:
Described sending entity is determined the air interface propagation delay time according to the Loop Round Trip Time mean value of the data of predetermined number, and the Loop Round Trip Time of described data is described time difference.
3. a kind of control sub layer of wireless link as claimed in claim 1 sends the method for adjustment of cache size, it is characterized in that described data comprise: service data unit.
4. a kind of control sub layer of wireless link as claimed in claim 3 sends the method for adjustment of cache size, it is characterized in that described step a further comprises:
Described sending entity recorder is to the time of the next service data unit of its corresponding upper transmission;
The status report loaded information that described sending entity comes according to the opposite end transmission is determined by the service data unit of the complete correct reception in opposite end, and recorder is to the time of corresponding status report;
Described sending entity is at the service data unit of determining predetermined number during by complete correct receptions in opposite end, according to described each service data unit writing time, the average Loop Round Trip Time that described predetermined number is determined service data unit of correspondence respectively;
Described average Loop Round Trip Time is defined as the air interface propagation delay time.
5. a kind of control sub layer of wireless link as claimed in claim 4 sends the method for adjustment of cache size, it is characterized in that described method also comprises: obtain described sending entity and the professional maximum rate of interlayer on it;
And described step b further comprises:
Product according to described professional maximum rate and air interface propagation delay time is adjusted the size that control sub layer of wireless link sends buffer memory.
6. a kind of control sub layer of wireless link as claimed in claim 5 sends the method for adjustment of cache size, it is characterized in that described method also comprises: the time delay scale factor is set;
And described step b further comprises:
Product according to described professional maximum rate, time delay scale factor and air interface propagation delay time is adjusted the size that control sub layer of wireless link sends buffer memory.
7. a kind of control sub layer of wireless link as claimed in claim 1 sends the method for adjustment of cache size, it is characterized in that described method also comprises: obtain described sending entity and the professional maximum rate of interlayer on it;
And described step b further comprises:
Product according to described professional maximum rate and air interface propagation delay time is adjusted the size that control sub layer of wireless link sends buffer memory.
8. a kind of control sub layer of wireless link as claimed in claim 7 sends the method for adjustment of cache size, it is characterized in that described method also comprises: the time delay scale factor is set;
And described step b further comprises: the product according to described professional maximum rate, time delay scale factor and air interface propagation delay time is adjusted the size that control sub layer of wireless link sends buffer memory.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004101028392A CN100421413C (en) | 2004-12-28 | 2004-12-28 | Method for adjusting size of transmission buffer in control sub layer of wireless link |
| PCT/CN2005/002336 WO2006069534A1 (en) | 2004-12-28 | 2005-12-28 | A method for adjusting the size of the transmission buffer of rlc sub-layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004101028392A CN100421413C (en) | 2004-12-28 | 2004-12-28 | Method for adjusting size of transmission buffer in control sub layer of wireless link |
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| Publication Number | Publication Date |
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| CN1798085A CN1798085A (en) | 2006-07-05 |
| CN100421413C true CN100421413C (en) | 2008-09-24 |
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| CNB2004101028392A Expired - Fee Related CN100421413C (en) | 2004-12-28 | 2004-12-28 | Method for adjusting size of transmission buffer in control sub layer of wireless link |
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| CN (1) | CN100421413C (en) |
| WO (1) | WO2006069534A1 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1878144A (en) * | 2006-07-14 | 2006-12-13 | 华为技术有限公司 | Multi-queue flow control method |
| CN102457486B (en) * | 2010-10-19 | 2016-01-06 | 华为技术有限公司 | A kind of transmission method of media content and device |
| CN102469356A (en) * | 2010-11-05 | 2012-05-23 | 乐金电子(中国)研究开发中心有限公司 | Internet protocol television video play method and Internet protocol television video receiver |
| CN108512708B (en) * | 2017-02-24 | 2023-01-06 | 中兴通讯股份有限公司 | Cache calculation method and device |
| CN110290552B (en) * | 2018-03-19 | 2022-01-04 | 腾讯科技（深圳）有限公司 | Method and device for measuring cache depth, storage medium and electronic device |
| CN110062425A (en) * | 2019-04-08 | 2019-07-26 | 京信通信系统（中国）有限公司 | Control method, device, computer equipment and the storage medium of network transmission speed |
| CN112399471B (en) * | 2020-10-23 | 2023-02-10 | 紫光展锐(重庆)科技有限公司 | Data caching method and related device |
| CN113055302B (en) * | 2021-03-03 | 2022-08-23 | 展讯通信（上海）有限公司 | Transmission Control Protocol (TCP) data transmission method and device and electronic equipment |
| CN113301375B (en) * | 2021-05-24 | 2022-10-14 | 上海绚显科技有限公司 | Data sending method and device |
| CN114173144A (en) * | 2021-12-02 | 2022-03-11 | 北京优祥智恒科技有限公司 | Live broadcast equipment, control method thereof and live broadcast backpack |
| CN114222194A (en) * | 2021-12-17 | 2022-03-22 | 浙江大华技术股份有限公司 | Video code stream adjusting method, device and system |
| CN114827681B (en) * | 2022-04-24 | 2024-03-22 | 咪咕视讯科技有限公司 | Video synchronization method, device, electronic equipment, terminal equipment and storage medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1352846A (en) * | 1999-01-14 | 2002-06-05 | 艾利森电话股份有限公司 | Adaptive jitter buffering |
| US6683889B1 (en) * | 1999-11-15 | 2004-01-27 | Siemens Information & Communication Networks, Inc. | Apparatus and method for adaptive jitter buffers |
| WO2004054181A1 (en) * | 2002-12-06 | 2004-06-24 | Qualcomm Incorporated | A method of and apparatus for adaptive control of data buffering in a data transmitter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1620782A (en) * | 2002-02-22 | 2005-05-25 | 连宇通信有限公司 | Priority control method in wireless pocket data channel |
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2004
- 2004-12-28 CN CNB2004101028392A patent/CN100421413C/en not_active Expired - Fee Related
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- 2005-12-28 WO PCT/CN2005/002336 patent/WO2006069534A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1352846A (en) * | 1999-01-14 | 2002-06-05 | 艾利森电话股份有限公司 | Adaptive jitter buffering |
| US6683889B1 (en) * | 1999-11-15 | 2004-01-27 | Siemens Information & Communication Networks, Inc. | Apparatus and method for adaptive jitter buffers |
| WO2004054181A1 (en) * | 2002-12-06 | 2004-06-24 | Qualcomm Incorporated | A method of and apparatus for adaptive control of data buffering in a data transmitter |
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| Publication number | Publication date |
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| WO2006069534A1 (en) | 2006-07-06 |
| CN1798085A (en) | 2006-07-05 |
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