CN101420289B - Method and apparatus for tuning maximum transmission times - Google Patents
Method and apparatus for tuning maximum transmission times Download PDFInfo
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- CN101420289B CN101420289B CN2007101761955A CN200710176195A CN101420289B CN 101420289 B CN101420289 B CN 101420289B CN 2007101761955 A CN2007101761955 A CN 2007101761955A CN 200710176195 A CN200710176195 A CN 200710176195A CN 101420289 B CN101420289 B CN 101420289B
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- maximum transmission
- bler
- transmission times
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Abstract
The present invention discloses a method of adjusting the maximum transmission frequency and an apparatus thereof. In the scheme disclosed by the present invention, the current maximum transmission frequency of a data block is adjusted according to the object residue BLER, therefore, the maximum transmission frequency can perform a self-adaptive dynamic adjustment. According to the scheme disclosed by the present invention, a self-adaptive adjustment can be performed to the maximum transmission frequency of the data block according to the actual channel environment, therefore, the current BLER corresponding to the current maximum transmission frequency tends to the object residue BLER step by step, the requirements of object residue BLER are satisfied effectively, the control of the object residue BLER is realized and the system efficiency is improved. The scheme disclosed by the present invention is not only suitable for systems adopting the HSDPA technology, but also suitable for systems adopting other technologies.
Description
Technical field
The present invention relates to moving communicating field, be meant a kind of method and device of adjusting maximum transmission times especially.
Background technology
In order to improve the transmission rate of downlink data, third generation partner program (3GPP, 3rd GenerationPartnership Project) introduced high-speed downlink packet access (HSDPA, HighSpeed Downlink Package Access) technology in the version 5.The HSDPA technology is a kind of link adaptation techniques, and when portable terminal during near base-station node, channel condition is good, and system is with very high rate transmissioning data; And when portable terminal during away from base-station node, bad channel conditions, system are not by increasing the transmission rate that power improves data, but adopt lower rate transmissioning data.This link adaptation techniques mainly is to indicate by the channel quality of portable terminal feedback to realize, promptly the self adaptation of link is realized according to the definite coded modulation grade (MCS) that sends data of channel quality indication of portable terminal feedback in the base station.
In the present HSDPA system, require the Block Error Rate (BLER) of transmission first of data block to be not more than 0.1.The residual BLER then quality of service with data block is relevant, promptly has the target requirement of different residual BLER for the different business quality.
HSDPA mainly is made of adaptive modulation and coding (AMC, Adaptive Modulation and Coding) and two key technologies of mixed automatic retransmission request (HARQ, HybridAutomatic Repeat Request).The AMC technology is a kind of physical layer link self adaptation (Link Adaptation) technology, can be by modulation and the coded system of adjusting data adaptively, compensate the influence of fading that is caused to received signal owing to channel variation, thereby improve the signal-to-noise performance of signal.When requiring only to adopt the AMC technology in 3GPP, the Block Error Rate of data block is no more than 0.1.AMC adjusts transmission rate by changing modulation system and channel encoding rate, in the version 5 of HSDPA technology modulation is divided into Quaternary Phase Shift Keying (QPSK, QuaternaryPhase Shift Keying) and two kinds of 16 quadrature amplitude modulation (QAM, Quadrature AmplitudeModulation).Be positioned at vantage point portable terminal, can be assigned with higher modulation levels and higher code rate as the nearer portable terminal in distance base station, for example, the Turbo encoder bit rate of 16QAM and R=3/4; And be positioned at the portable terminal of unfavorable position, can be assigned with lower modulation levels and code rate as the portable terminal near cell edge, for example, the Turbo encoder bit rate of QPSK and R=1/2.The HARQ technology is a kind of link adaptation techniques, can adapt to the continually varying channel condition automatically.Different with the AMC technology is: the HARQ technology is insensitive to measuring mistake and measuring time delay, these two kinds of link adaptation techniques of HARQ technology and AMC technology are used in combination obtain more satisfactory effect, be the AMC technology based on the channel measurement result transmission rate of determination data roughly, HARQ finely tunes the transmission rate of data according to the Real-time Channel condition on this basis again.
Present HARQ technology mainly comprises following three kinds of implementations.
Implementation one
Transmitting terminal is carried out cyclic redundancy code (CRC, Cyclic Redundancy Code) with data, and uses forward error correction (FEC, Forward Error Correction) coding, sends then.Receiving terminal decoding FEC and with CRC monitoring grouping quality if find that the data block of current reception is wrong, then notifies transmitting terminal to retransmit this data block, abandons wrong data block.Transmitting terminal adopts and last identical coding the data block that retransmits, and sends then.Receiving terminal is directly decoded to the data block that retransmits.
Implementation two
Different with implementation one is, when receiving terminal found that the data block of current reception is wrong, the data block that receiving terminal notice transmitting terminal retransmits was an incremental redundancy information, receiving terminal have only will re-transmitting data block with the merging of data in buffer piece after could decode.As shown in Figure 1, code word C
0For (wherein, M is for sending for the first time total bit length of data block for M, K) error detection code, and K is the bit length of effective information in the data block, code word C
1Be (2M, M) error correcting code.Transmitting terminal sends data block I for the first time, is code word C
0Receiving terminal carries out verification to the data block that receives, if do not find mistake then send ACK, if find wrong then send NACK.Making a start receives NACK from receiving terminal, shows that the last data piece of transmission is made mistakes, and then sends the data block P (I) of another M bit; Receiving terminal promptly constitutes code word C with the I merging of P (I) with the buffer memory of reception
1, decode then and verification.The P of follow-up transmission (I) is exactly an incremental redundancy information, and is inequality with the I that sends for the first time.
Implementation three
Implementation three also belongs to incremental redundancy (IR) scheme, and different with implementation two is that the data block that retransmits has the self-demarking code ability, so receiving terminal can directly be decoded by the data block that retransmits and be recovered correct data; Also data block and the existing data in buffer piece that retransmits can be merged the back decoding, recover correct data.With reference to Fig. 1, maximum different just being of implementation three can recover data I according to the P (I) that retransmits.In addition according to the difference of the redundant information that retransmits, specifically can be refined as two kinds of processing modes in the implementation three again, a kind of processing mode is only to have a kind of redundant information in the retransmission processes, i.e. the redundant information of each time re-transmission all with data block transmitted identical (Chase Combing) for the first time; Another kind of processing mode is to have a plurality of different redundant informations in the retransmission processes, all with for the first time data block transmitted is different for the redundant information of each time re-transmission, at this moment, redundant information and the existing data in buffer piece that retransmits need be merged the back decoding, recover correct data.
No matter the specific implementation of any HARQ technology can both progressively reduce residual BLER along with the increase of maximum transmission times.Maximum transmission times is meant the maximum times that a data block can be sent out, and surpassing this number of times will no longer be retransmitted.At present, maximum transmission times is usually by high level notice, upgrades slowlyer, can not well adapt to the variation of actual channel environment, can not satisfy the demand of residual BLER, reduced system effectiveness.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method and device of adjusting maximum transmission times, effectively improves system effectiveness.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of method of adjusting maximum transmission times is characterized in that, this method comprises:
A, the current maximum transmission times of data block is adjusted according to the object residue block error rate BLER.
Wherein, described steps A may further comprise the steps:
Initial BLER and object residue BLER that A1, basis are determined determine initial maximum transmission times;
When A2, first transmission data block, with initial maximum transmission times as current maximum transmission times;
A3, whether current maximum transmission times is adjusted by correct transmission according to data block.Wherein, described steps A 1 is:
, wherein, BLER
FirstBe initial BLER, BLER
LastBe object residue BLER, L
FirstBe initial maximum transmission times.
Wherein, described steps A 3 is: a data block is correctly transmitted, and adjusts current maximum transmission times downwards; Perhaps, a data block is dropped, and adjusts upward maximum transmission times.
The current maximum transmission times of described downward adjustment, for:
, wherein, L is current maximum transmission times, step is for adjusting step-length; The described maximum transmission times that adjusts upward, for:,
Wherein, N=1/BLER
Last-1.
This method further comprises: delay counter is set, when portable terminal carries out the k time transmission, when arriving k * T1/L, also do not finish the counting of determining delay counter transmission of data blocks, priority scheduling is transmitted the data block of this portable terminal, wherein, T1 is the maximum count of delay counter, and L is current maximum transmission times.
Carry out when transmission the k time to a plurality of portable terminals, also do not finish transmission of data blocks when the counting of determining delay counter arrives k * T1/L, transmit the data block of each portable terminal according to scheduling priority parameter priority scheduling successively.
A kind of device of adjusting maximum transmission times, this device comprises: determining unit and adjustment unit, wherein, described determining unit is used for determining initial maximum transmission times according to initial BLER and object residue BLER, during first transmission data block, with initial maximum transmission times as current maximum transmission times; Whether described adjustment unit is used for by correct transmission described current maximum transmission times being adjusted according to data block.
This device further comprises: scheduling unit, be used for when portable terminal carries out the k time transmission, determine when the counting of delay counter arrives k * T1/L, also not finish transmission of data blocks, priority scheduling is transmitted the data block of this portable terminal, wherein, T1 is the maximum count of delay counter, and L is current maximum transmission times.
Described scheduling unit is further used for when a plurality of portable terminals carry out the k time transmission, determine when the counting of delay counter arrives k * T1/L, all not finish transmission of data blocks, transmit the data block of each portable terminal according to scheduling priority parameter priority scheduling successively.
Among the present invention, the current maximum transmission times of data block is adjusted, made maximum transmission times can carry out adaptive dynamic adjustment according to object residue BLER.According to scheme provided by the invention, can be according to the channel circumstance of reality, maximum transmission times to data block carries out adaptive adjustment, feasible current BLER corresponding to current maximum transmission times progressively trends towards object residue BLER, effectively satisfied the demand of object residue BLER, realization has improved system effectiveness to the control of object residue BLER.
Scheme provided by the invention is not only applicable to adopt the system of HSDPA technology, equally is applicable to the system that adopts other technologies yet.
Description of drawings
Fig. 1 realizes principle schematic for existing HARQ technical implementation way two;
Fig. 2 is for adjusting the maximum transmission times flow chart among the present invention;
Fig. 3 is maximum transmission times adjusting device structural representation among the present invention.
Embodiment
Among the present invention, the current maximum transmission times of data block is adjusted, made maximum transmission times can carry out adaptive dynamic adjustment according to object residue BLER.Scheme provided by the invention is not only applicable to adopt the system of HSDPA technology, equally is applicable to the system that adopts other technologies yet, that is, as long as have maximum transmission times in the system, all can adjust by scheme provided by the invention.
Fig. 2 is for adjusting the maximum transmission times flow chart among the present invention, as shown in Figure 2, the processing procedure of adjusting maximum transmission times may further comprise the steps:
Step 201: determine initial BLER, be designated as BLER
FirstCan set transmission first and under relatively-stationary prerequisite, carry out, like this, BLER
FirstBe relatively-stationary.
Step 202: determine object residue BLER, be designated as BLER
LastBLER
LastCan be that system sets according to actual conditions.
Step 203: according to BLER
FirstAnd BLER
LastDetermine initial maximum transmission times, initial maximum transmission times is designated as L
First, specifically be treated to:
, wherein,
Be rounding up of x.
Step 204-step 205: begin to carry out the transmission of data block, during first transmission data block, current maximum transmission times L is L on the initial maximum transmission times
First, i.e. L=L
First
Step 206: whether current maximum transmission times is adjusted according to data block, realized channel circumstance, the maximum transmission times of data block is carried out the self adaptation adjustment, specifically be treated to according to reality by correct transmission:
If a data block is correctly transmitted, then adjust current maximum transmission times L downwards, be specially
, wherein, step can determine that for adjusting step-length promptly current maximum transmission times is adjusted one downwards and adjusted step-length by emulation;
If a data block is dropped, promptly a data block is not correctly transmitted, and then adjusts upward maximum transmission times L, is specially
, wherein, N=1/BLER
Last-1, promptly current maximum transmission times adjusts upward N and adjusts step-length.
According to above description as seen, N is the ratio that adjusts upward with the amplitude of adjusting downwards, the i.e. value of N * step/step.
Delay counter is set, the maximum count T1 of this delay counter is set according to system's delay requirement, if carry out when transmission the k time to portable terminal, when arriving k * T1/L, the counting of determining delay counter also do not finish transmission of data blocks, and then priority scheduling is transmitted the data block of this portable terminal; If above-mentioned condition is satisfied in the transmission to a plurality of portable terminals simultaneously, be that a plurality of portable terminals carry out when transmission the k time, determine when the counting of delay counter arrives k * T1/L, all not finish transmission of data blocks, then transmit the data block of each portable terminal according to the scheduling priority parameter in dispatching algorithm priority scheduling successively.Whenever finish the transmission of data blocks of a portable terminal, delay counter is resetted.
The above each operation is finished by base-station node.
Fig. 3 is maximum transmission times adjusting device structural representation among the present invention, as shown in Figure 3, the maximum transmission times adjusting device comprises determining unit and adjustment unit, wherein, determining unit is used for determining initial maximum transmission times according to initial BLER and object residue BLER, during first transmission data block, initial maximum transmission times as current maximum transmission times, and is offered adjustment unit; Whether adjustment unit is used for by correct transmission current maximum transmission times being adjusted according to data block.
The maximum transmission times adjusting device further comprises scheduling unit, is used for carrying out when transmission the k time to portable terminal, determines also not finish transmission of data blocks when counting at delay counter arrives k * T1/L, and priority scheduling is transmitted the data block of this portable terminal; And be further used for when a plurality of portable terminals carry out the k time transmission, determine when the counting of delay counter arrives k * T1/L, all not finish transmission of data blocks, transmit the data block of each portable terminal according to the scheduling priority parameter in dispatching algorithm priority scheduling successively.
Above-described big the number of transmissions adjusting device is positioned at the base-station node side.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (8)
1. a method of adjusting maximum transmission times is characterized in that, this method comprises:
A, the current maximum transmission times of data block is adjusted according to the object residue block error rate BLER;
Wherein, described steps A may further comprise the steps:
A1, determine initial BLER, and definite object residue BLER, determine initial maximum transmission times according to initial BLER that determines and the object residue BLER that determines;
When A2, first transmission data block, with initial maximum transmission times as current maximum transmission times;
A3, whether current maximum transmission times is adjusted by correct transmission according to data block;
And described steps A 1 is:
Wherein, BLER
FirstBe initial BLER, BLER
LastBe object residue BLER, L
FirstBe initial maximum transmission times.
2. method according to claim 1 is characterized in that, described steps A 3 is:
A data block is correctly transmitted, and adjusts current maximum transmission times downwards; Perhaps,
A data block is dropped, and adjusts upward current maximum transmission times.
3. method according to claim 2 is characterized in that,
The current maximum transmission times of described downward adjustment, for:
Wherein, L is current maximum transmission times, and step is for adjusting step-length;
Describedly adjust upward current maximum transmission times, for:
Wherein, N=1/BLER
Last-1.
4. according to the arbitrary described method of claim 1 to 3, it is characterized in that, this method further comprises: delay counter is set, when carrying out the k time transmission to portable terminal, also do not finish transmission of data blocks when determining the counting arrival k * T1/L when the time delay counter, priority scheduling is transmitted the data block of this portable terminal, wherein, T1 is the maximum count of delay counter, and L is current maximum transmission times.
5. method according to claim 4, it is characterized in that, carry out when transmission the k time to a plurality of portable terminals, also do not finish transmission of data blocks when the counting of determining delay counter arrives k * T1/L, transmit the data block of each portable terminal according to scheduling priority parameter priority scheduling successively.
6. a device of adjusting maximum transmission times is characterized in that, this device comprises: determining unit and adjustment unit, wherein,
Described determining unit is used for determining initial maximum transmission times according to initial BLER and object residue BLER, during first transmission data block, with initial maximum transmission times as current maximum transmission times, wherein, according to BLER
FirstAnd BLER
LastDetermine initial maximum transmission times L
FirstSpecifically be treated to:
Wherein,
Be rounding up of x;
Whether described adjustment unit is used for by correct transmission described current maximum transmission times being adjusted according to data block.
7. device according to claim 6, it is characterized in that, this device further comprises: scheduling unit, be used for when carrying out the k time transmission to portable terminal, also do not finish transmission of data blocks when determining the counting arrival k * T1/L when the time delay counter, priority scheduling is transmitted the data block of this portable terminal, wherein, T1 is the maximum count of delay counter, and L is current maximum transmission times.
8. device according to claim 7, it is characterized in that, described scheduling unit is further used for when a plurality of portable terminals carry out the k time transmission, determine when the counting of delay counter arrives k * T1/L, all not finish transmission of data blocks, transmit the data block of each portable terminal according to scheduling priority parameter priority scheduling successively.
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|---|---|---|---|
| CN2007101761955A CN101420289B (en) | 2007-10-22 | 2007-10-22 | Method and apparatus for tuning maximum transmission times |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101761955A CN101420289B (en) | 2007-10-22 | 2007-10-22 | Method and apparatus for tuning maximum transmission times |
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| CN101420289B true CN101420289B (en) | 2011-12-14 |
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| CN103634922B (en) * | 2012-08-27 | 2019-01-18 | 中兴通讯股份有限公司 | Method, system and base station based on dispatching priority dispatch terminal |
| CN105637790B (en) * | 2014-09-17 | 2019-03-19 | 华为技术有限公司 | A kind of method and device retransmitting data |
| CN108667500B (en) | 2017-03-30 | 2021-02-09 | 华为技术有限公司 | Data transmission method, terminal equipment and network equipment |
| CN109639684B (en) * | 2018-12-17 | 2021-11-09 | 北京微吼时代科技有限公司 | Method and system for dynamically applying bandwidth |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1674489A (en) * | 2005-04-30 | 2005-09-28 | 清华大学 | Data adaptive mixing automatic retransmitting method for orthogonal frequency division multisystem |
| CN1859066A (en) * | 2006-01-18 | 2006-11-08 | 华为技术有限公司 | Method and device for channel quality indication calibrating and base station dispatching users data |
| CN1925352A (en) * | 2005-09-02 | 2007-03-07 | 中兴通讯股份有限公司 | Method for realizing HSUPA external ring power control |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1674489A (en) * | 2005-04-30 | 2005-09-28 | 清华大学 | Data adaptive mixing automatic retransmitting method for orthogonal frequency division multisystem |
| CN1925352A (en) * | 2005-09-02 | 2007-03-07 | 中兴通讯股份有限公司 | Method for realizing HSUPA external ring power control |
| CN1859066A (en) * | 2006-01-18 | 2006-11-08 | 华为技术有限公司 | Method and device for channel quality indication calibrating and base station dispatching users data |
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