CN101420289A - Method and apparatus for tuning maximum transmission times - Google Patents
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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 the field of mobile communications, and in particular, to a method and an apparatus for adjusting maximum transmission times.
Background
In order to increase the transmission rate of Downlink data, a High Speed Downlink Packet Access (HSDPA) technique is introduced in release 5 of the third generation partnership Project (3 GPP). The HSDPA technology is a link adaptive technology, and when a mobile terminal approaches a base station node, the channel condition is good, and the system transmits data at a high rate; when the mobile terminal is far away from the base station node, the channel condition is poor, and the system does not increase the transmission rate of data by increasing power, but adopts a lower rate to transmit data. The link adaptation technology is mainly realized through channel quality indication fed back by the mobile terminal, namely, the base station determines the coding modulation level (MCS) of the transmitted data according to the channel quality indication fed back by the mobile terminal, so as to realize the link adaptation.
In the current HSDPA system, a block error rate (BLER) of a first transmission of a data block is required to be not more than 0.1. The residual BLER is then related to the quality of service of the data block, i.e. has different target requirements for the residual BLER for different quality of service.
HSDPA is mainly composed of two key technologies, Adaptive Modulation and Coding (AMC) and Hybrid Automatic Repeat Request (HARQ). The AMC technology is a Link Adaptation (Link Adaptation) technology, and can compensate for fading influence on a received signal due to channel variation by adaptively adjusting a modulation and coding scheme of data, thereby improving signal-to-noise performance of the signal. When only the AMC technology is required in 3GPP, the block error rate of a data block does not exceed 0.1. AMC adjusts a transmission rate by changing a modulation scheme and a channel coding rate, and release 5 of the HSDPA technology divides modulation into QPSK (Quadrature phase Shift Keying) and QAM (Quadrature amplitude modulation). A mobile terminal located in a favorable position, such as a mobile terminal located closer to the base station, may be assigned a higher modulation level and a higher coding rate, e.g., a Turbo coding rate of 16QAM and R3/4; while mobile terminals located at unfavorable locations, such as near the cell edge, may be assigned lower modulation levels and coding rates, e.g., QPSK and a Turbo coding rate of R1/2. The HARQ technology is a link adaptation technology capable of automatically adapting to continuously varying channel conditions. Different from the AMC technology: the HARQ technology is insensitive to measurement errors and measurement delay, and a relatively ideal effect can be obtained by combining the HARQ technology and the AMC technology, that is, the AMC technology approximately determines the transmission rate of data based on the channel measurement result, and the HARQ finely adjusts the transmission rate of data according to the real-time channel condition on the basis.
The current HARQ technology mainly includes the following three implementations.
Implementation mode one
The transmitting end applies Cyclic Redundancy Code (CRC) to data, encodes the data using Forward Error Correction (FEC), and then transmits the encoded data. And the receiving end decodes the FEC and monitors the packet quality by using the CRC, if the currently received data block is found to have errors, the transmitting end is informed of the need of retransmitting the data block, and the erroneous data block is discarded. And the transmitting end adopts the same coding as the previous time to the retransmitted data block and then transmits the data block. The receiving end directly decodes the retransmitted data block.
Implementation mode two
Different from the first implementation manner, when the receiving end finds that the currently received data block has an error, the receiving end notifies the transmitting end that the retransmitted data block is incremental redundancy information, and the receiving end only retransmits the data blockAnd the data block is merged with the cached data block and then can be decoded. As shown in fig. 1, codeword C0Is an (M, K) error detection code, where M is the total bit length of the data block transmitted for the first time, K is the bit length of the valid information in the data block, and code word C1Is a (2M, M) error correction code. The first time the data block I, i.e. the code word C, is sent by the sending end0(ii) a And the receiving end checks the received data block, and sends ACK if no error is found, and sends NACK if an error is found. The transmitting end receives NACK from the receiving end, and sends another M-bit data block P (I) if the transmitting end indicates that the previous data block is wrong; the receiving end combines the received P (I) and the buffered I to form a code word C1Then decoding and checking are performed. The p (I) of the subsequent transmission is the incremental redundancy information, which is different from the I of the first transmission.
Implementation mode three
The third implementation mode also belongs to an Incremental Redundancy (IR) scheme, and is different from the second implementation mode in that the retransmitted data block has self-decoding capability, so that a receiving end can directly recover correct data through decoding of the retransmitted data block; or the retransmitted data block and the data block which has been cached can be combined and decoded to recover the correct data. Referring to fig. 1, the biggest difference between the third implementation mode and the third implementation mode is that data I can be recovered according to retransmitted p (I). In addition, according to the difference of the retransmitted redundant information, the third implementation mode can be specifically refined into two processing modes, wherein one processing mode is that only one redundant information is provided in the retransmission process, namely the redundant information of each retransmission is the same as the data block transmitted for the first time (Chase combining); another processing method is that a plurality of different redundant information are provided in the retransmission process, the redundant information of each retransmission is different from the data block transmitted for the first time, and at this time, the retransmitted redundant information needs to be combined with the data block which has been cached and then decoded to recover correct data.
In any implementation of the HARQ technique, the residual BLER can be gradually reduced as the maximum number of transmissions increases. The maximum number of transmissions refers to the maximum number of times a data block can be transmitted, beyond which it will not be retransmitted. At present, the maximum transmission times are usually notified by a high layer, updating is slow, the method cannot well adapt to the change of an actual channel environment, the requirement of residual BLER cannot be met, and the system efficiency is reduced.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for adjusting the maximum transmission times, so as to effectively improve the system efficiency.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for adjusting maximum transmission times, the method comprising:
A. and adjusting the current maximum transmission times of the data block according to the target residual block error rate BLER.
Wherein the step A comprises the following steps:
a1, determining the initial maximum transmission times according to the determined initial BLER and the target residual BLER;
a2, when the data block is transmitted for the first time, taking the initial maximum transmission times as the current maximum transmission times;
and A3, adjusting the current maximum transmission times according to whether the data block is transmitted correctly.
Wherein the step A1 is:wherein, BLERfirstFor initial BLER, BLERlastIs the target residual BLER, LfirstIs the initial maximum number of transmissions.
Wherein the step A3 is: a data block is correctly transmitted, and the current maximum transmission times are adjusted downwards; alternatively, a data block is discarded and the maximum number of transmissions is adjusted upward.
The downward adjustment of the current maximum transmission times is as follows:
wherein, L is the current maximum transmission times, and step is the adjustment step length; the maximum transmission times are adjusted upwards, and the maximum transmission times are as follows:
wherein N is 1/BLERlast-1。
The method further comprises the following steps: and setting a delay counter, determining that the transmission of the data block is not finished when the count of the delay counter reaches kXT 1/L when the kth transmission is carried out to the mobile terminal, and preferentially scheduling and transmitting the data block of the mobile terminal, wherein T1 is the maximum count of the delay counter, and L is the current maximum transmission frequency.
And when the kth transmission is carried out to a plurality of mobile terminals, determining that the data block transmission is not finished when the count of the delay counter reaches kXT 1/L, and sequentially and preferentially scheduling and transmitting the data blocks of each mobile terminal according to the scheduling priority parameter.
An apparatus for adjusting a maximum number of transmissions, the apparatus comprising: the device comprises a determining unit and an adjusting unit, wherein the determining unit is used for determining initial maximum transmission times according to an initial BLER and a target residual BLER, and when a data block is transmitted for the first time, the initial maximum transmission times is used as the current maximum transmission times; the adjusting unit is used for adjusting the current maximum transmission times according to whether the data block is transmitted correctly.
The apparatus further comprises: and the scheduling unit is used for determining that the data block transmission is not finished when the count of the delay counter reaches kXT 1/L when the kth transmission is carried out to the mobile terminal, and preferentially scheduling and transmitting the data block of the mobile terminal, wherein T1 is the maximum count of the delay counter, and L is the current maximum transmission frequency.
And the scheduling unit is further used for determining that the data block transmission is not finished when the count of the delay counter reaches kXT 1/L when the kth transmission is carried out to the plurality of mobile terminals, and preferentially scheduling and transmitting the data blocks of each mobile terminal in sequence according to the scheduling priority parameter.
In the invention, the current maximum transmission times of the data block are adjusted according to the target residual BLER, so that the maximum transmission times can be dynamically adjusted in a self-adaptive manner. According to the scheme provided by the invention, the maximum transmission times of the data block can be adaptively adjusted according to the actual channel environment, so that the current BLER corresponding to the current maximum transmission times gradually tends to the target residual BLER, the requirement of the target residual BLER is effectively met, the control on the target residual BLER is realized, and the system efficiency is improved.
The scheme provided by the invention is not only suitable for the system adopting the HSDPA technology, but also suitable for the system adopting other technologies.
Drawings
Fig. 1 is a schematic diagram of a second implementation principle of a conventional HARQ technology implementation;
FIG. 2 is a flow chart of adjusting the maximum transmission times according to the present invention;
fig. 3 is a schematic structural diagram of a maximum transmission number adjusting apparatus according to the present invention.
Detailed Description
In the invention, the current maximum transmission times of the data block are adjusted according to the target residual BLER, so that the maximum transmission times can be dynamically adjusted in a self-adaptive manner. The scheme provided by the invention is not only suitable for the system adopting the HSDPA technology, but also suitable for the system adopting other technologies, namely, the scheme provided by the invention can be used for adjustment as long as the maximum transmission times exist in the system.
Fig. 2 is a flowchart of adjusting the maximum transmission times in the present invention, and as shown in fig. 2, the processing procedure of adjusting the maximum transmission times includes the following steps:
step 201: determine initial BLER, noted BLERfirst. It can be assumed that the first transmission is performed on the premise that the BLER is relatively fixed, so that the BLERfirstIs relatively fixed.
Step 202: determine the target residual BLER, denoted BLERlast。BLERlastThe system can be set according to actual conditions.
Step 203: according to BLERfirstAnd BLERlastDetermining initial maximum transmission times, wherein the initial maximum transmission times is recorded as LfirstThe specific treatment is as follows:
wherein,rounded up for x.
Step 204 to step 205: starting to transmit data blocks, and when the data blocks are transmitted for the first time, the current maximum transmission times L are the initial maximum transmission times LfirstI.e. L ═ Lfirst。
Step 206: the current maximum transmission times are adjusted according to whether the data block is correctly transmitted or not, so that the maximum transmission times of the data block are adaptively adjusted according to the actual channel environment, and the specific treatment is as follows:
if a data block is correctly transmitted, the current maximum number of transmissions L is adjusted downwards, in particular
Step is an adjustment step length which can be determined through simulation, namely, the current maximum transmission times is adjusted downwards by one adjustment step length;
if a data block is discarded, i.e. a data block is not correctly transmitted, the maximum number of transmissions L is adjusted upwards, in particular
Wherein，N＝1/BLERlast1, namely, the current maximum transmission times are adjusted upwards by N adjustment steps.
As can be seen from the above description, N is the ratio of the magnitude of the upward adjustment to the downward adjustment, i.e., the value of N × step/step.
Setting a delay counter, setting the maximum count T1 of the delay counter according to the system delay requirement, if the kth transmission is carried out to the mobile terminal, determining that the data block transmission is not completed when the count of the delay counter reaches kXT 1/L, and preferentially scheduling and transmitting the data block of the mobile terminal; if the transmission to a plurality of mobile terminals simultaneously meets the condition, namely when the plurality of mobile terminals carry out the k-th transmission, the data block transmission is determined to be not finished when the count of the time delay counter reaches k multiplied by T1/L, and the data blocks of each mobile terminal are transmitted in sequence and preferentially scheduled according to the scheduling priority parameter in the scheduling algorithm. And resetting the delay counter every time the data block transmission of the mobile terminal is completed.
All the operations are completed by the base station node.
Fig. 3 is a schematic structural diagram of a maximum transmission frequency adjusting apparatus in the present invention, and as shown in fig. 3, the maximum transmission frequency adjusting apparatus includes a determining unit and an adjusting unit, where the determining unit is configured to determine an initial maximum transmission frequency according to an initial BLER and a target residual BLER, and when a data block is transmitted for the first time, the initial maximum transmission frequency is used as a current maximum transmission frequency and is provided to the adjusting unit; the adjusting unit is used for adjusting the current maximum transmission times according to whether the data block is transmitted correctly.
The maximum transmission number adjusting device further comprises a scheduling unit, which is used for determining that the data block transmission is not finished when the count of the time delay counter reaches kXT 1/L when the kth transmission is carried out to the mobile terminal, and preferentially scheduling and transmitting the data block of the mobile terminal; and further used for determining that the data block transmission is not finished when the count of the delay counter reaches kXT 1/L when the kth transmission is carried out to a plurality of mobile terminals, and carrying out priority scheduling transmission on the data blocks of each mobile terminal in sequence according to the scheduling priority parameter in the scheduling algorithm.
The above-mentioned large transmission frequency adjusting device is located at the base station node side.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (10)
1. A method for adjusting maximum transmission times, the method comprising:
A. and adjusting the current maximum transmission times of the data block according to the target residual block error rate BLER.
2. The method of claim 1, wherein step a comprises the steps of:
a1, determining the initial maximum transmission times according to the determined initial BLER and the target residual BLER;
a2, when the data block is transmitted for the first time, taking the initial maximum transmission times as the current maximum transmission times;
and A3, adjusting the current maximum transmission times according to whether the data block is transmitted correctly.
3. The method according to claim 2, wherein the step a1 is:
wherein, BLERfirstFor initial BLER, BLERlastIs the target residual BLER, LfirstIs the initial maximum number of transmissions.
4. The method according to claim 2, wherein the step a3 is:
a data block is correctly transmitted, and the current maximum transmission times are adjusted downwards; or,
a data block is discarded and the maximum number of transmissions is adjusted upwards.
5. The method of claim 4,
the downward adjustment of the current maximum transmission times is as follows:
wherein, L is the current maximum transmission times, and step is the adjustment step length;
the maximum transmission times are adjusted upwards, and the maximum transmission times are as follows:
wherein N is 1/BLERlast-1。
6. The method of any one of claims 1 to 5, further comprising: and setting a delay counter, determining that the transmission of the data block is not finished when the count of the delay counter reaches kXT 1/L when the kth transmission is carried out to the mobile terminal, and preferentially scheduling and transmitting the data block of the mobile terminal, wherein T1 is the maximum count of the delay counter, and L is the current maximum transmission frequency.
7. The method of claim 6, wherein when performing the kth transmission to a plurality of mobile terminals, determining that the data block transmission has not been completed when the count of the delay counter reaches kXT 1/L, and scheduling the data blocks for each mobile terminal in turn according to the scheduling priority parameter.
8. An apparatus for adjusting a maximum number of transmissions, the apparatus comprising: a determination unit and an adjustment unit, wherein,
the determining unit is used for determining initial maximum transmission times according to the initial BLER and the target residual BLER, and taking the initial maximum transmission times as the current maximum transmission times when the data block is transmitted for the first time;
the adjusting unit is used for adjusting the current maximum transmission times according to whether the data block is transmitted correctly.
9. The apparatus of claim 8, further comprising: and the scheduling unit is used for determining that the data block transmission is not finished when the count of the delay counter reaches kXT 1/L when the kth transmission is carried out to the mobile terminal, and preferentially scheduling and transmitting the data block of the mobile terminal, wherein T1 is the maximum count of the delay counter, and L is the current maximum transmission frequency.
10. The apparatus of claim 9, wherein the scheduling unit is further configured to determine that data block transmission is not completed when the count of the delay counter reaches kxt 1/L when the kth transmission is performed to the plurality of mobile terminals, and to sequentially and preferentially schedule and transmit the data blocks of each mobile terminal according to the scheduling priority parameter.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103634922A (en) * | 2012-08-27 | 2014-03-12 | 中兴通讯股份有限公司 | Dispatching priority-based method and system for dispatching terminal, and base station |
| CN105637790A (en) * | 2014-09-17 | 2016-06-01 | 华为技术有限公司 | Method and apparatus for retransmitting data |
| WO2018177049A1 (en) * | 2017-03-30 | 2018-10-04 | 华为技术有限公司 | Data transmission method, terminal device and network device |
| CN109639684A (en) * | 2018-12-17 | 2019-04-16 | 北京微吼时代科技有限公司 | The method and system of dynamic application bandwidth |
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| CN1314217C (en) * | 2005-04-30 | 2007-05-02 | 清华大学 | Data adaptive mixing automatic retransmitting method for orthogonal frequency division multisystem |
| CN100550679C (en) * | 2005-09-02 | 2009-10-14 | 中兴通讯股份有限公司 | HSUPA exterior ring power control implementation method |
| CN100426714C (en) * | 2006-01-18 | 2008-10-15 | 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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2007
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103634922A (en) * | 2012-08-27 | 2014-03-12 | 中兴通讯股份有限公司 | Dispatching priority-based method and system for dispatching terminal, and base station |
| 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 |
| CN105637790A (en) * | 2014-09-17 | 2016-06-01 | 华为技术有限公司 | Method and apparatus for retransmitting data |
| CN105637790B (en) * | 2014-09-17 | 2019-03-19 | 华为技术有限公司 | A kind of method and device retransmitting data |
| WO2018177049A1 (en) * | 2017-03-30 | 2018-10-04 | 华为技术有限公司 | Data transmission method, terminal device and network device |
| CN108667500A (en) * | 2017-03-30 | 2018-10-16 | 华为技术有限公司 | Data transmission method, terminal device and the network equipment |
| US10958329B2 (en) | 2017-03-30 | 2021-03-23 | Huawei Technologies Co., Ltd. | Data transmission method, terminal device, and network device |
| CN109639684A (en) * | 2018-12-17 | 2019-04-16 | 北京微吼时代科技有限公司 | The method and system of dynamic application bandwidth |
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