CN103516473B - Determine method and the base station of transport block size - Google Patents

Determine method and the base station of transport block size Download PDF

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CN103516473B
CN103516473B CN201210218257.5A CN201210218257A CN103516473B CN 103516473 B CN103516473 B CN 103516473B CN 201210218257 A CN201210218257 A CN 201210218257A CN 103516473 B CN103516473 B CN 103516473B
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value
tbs
cqi
preset
determining
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CN103516473A (en
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杭海存
张伟
吴晔
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

The embodiment of the invention discloses a kind of method for determining transport block size and base station, for transmission block.Size is adjusted, and present invention method includes：In current transmission time interval TTI, the first transport block size TBS is determined according to selected CQI value and selected code channel number；2nd TBS is determined according to the QoS requirement of selected CQI value, the first TBS and current business, power consumption can be reduced in the case where meeting the QoS requirement of current business, energy efficiency is improved, improve the performance of system.

Description

Method and base station for determining size of transmission block
Technical Field
The present invention relates to the field of communications, and in particular, to a method and a base station for determining a size of a transport block.
Background
The High Speed Downlink Packet Access (HSDPA) technology is one of the High Speed Packet transmission technologies developed by the standardization organization called 3rd Generation Partnership Project (3 GPP), and is a Wideband Code Division Multiple Access (WCDMA) downlink High Speed data solution, and the main features of the HSDPA system include: adopting a short frame of 2 ms; link self-Adaptive technologies such as Hybrid Automatic Repeat Request (HARQ) and Adaptive Modulation and Coding (AMC) are adopted in the physical layer; high-order modulation is introduced to improve the utilization rate of frequency spectrum; by adopting the technology, the purposes of improving the downlink peak data rate, improving the service delay characteristic, improving the downlink throughput, effectively utilizing downlink code resources and power resources, improving the downlink capacity and the like can be achieved.
In an existing HSDPA system, a base station includes a Transport Format Resource Control (TFRC) selection function, where TFRC selection refers to selecting a suitable transport Format according to a Channel condition and a resource condition, and specifically, a User Equipment (UE) sends a measured Channel Quality Indication (CQI) to the base station, and the base station allocates a transport Format to the UE according to the CQI, a power resource, a code Channel resource, and the like, where the transport Format includes: modulation scheme, Transport Block Size (TBS), the number of High Speed Physical Downlink Shared channels (HS-PDSCH), and the number of High Speed Shared Control channels (HS-SCCH).
In the prior art, when a base station selects and determines a data block size of transmission data based on TFRC, in order to pursue a higher transmission rate and a maximum throughput, a maximum usable CQI value and a maximum number of code channels are determined according to a CQI reported by a UE and a current available power resource, a maximum usable TBS is determined according to the maximum usable CQI value and the maximum number of code channels, a selected CQI value and a selected number of code channels are obtained according to a current buffer data amount of a system and the maximum TBS, a TBS is determined according to the selected CQI value and the selected number of code channels, and data transmission can be realized as fast as possible according to the TBS, however, data transmission according to the TBS generates a higher power consumption.
Disclosure of Invention
The embodiment of the invention provides a method and a base station for determining the size of a transmission block, which are used for determining the size of the transmission block for sending data to a user by the base station.
The method for determining the size of the transmission block in the embodiment of the invention comprises the following steps: determining a first transport block size TBS according to the selected CQI value and the selected code channel number in the current transmission time interval TTI; and determining a second TBS according to the selected CQI value, the first TBS and the service quality requirement of the current service.
The base station in the embodiment of the invention comprises: a first determining unit, configured to determine a first transport block size TBS according to a selected CQI value and a selected number of code channels in a current TTI; a second determining unit, configured to determine a second TBS according to the selected CQI value, the first TBS, and a quality of service requirement of a current service after the first determining unit determines the first TBS.
According to the technical scheme, the embodiment of the invention has the following advantages:
in the current transmission time interval, a first TBS is determined according to a selected CQI value and a selected code channel number, a second TBS is determined according to the selected CQI value, the first TBS and the service quality requirement of the current service, the value of the first TBS is adjusted under the condition of considering the service quality of the current service to obtain the second TBS, and the power consumption can be reduced, the energy efficiency can be improved, and the system performance can be improved under the condition of meeting the service quality requirement of the current service.
Drawings
FIG. 1 is a diagram illustrating a method for determining a size of a data block according to an embodiment of the present invention;
FIG. 2 is another diagram illustrating a method for determining a size of a data block according to an embodiment of the present invention;
FIG. 3 is another diagram illustrating a method for determining a size of a data block according to an embodiment of the present invention;
FIG. 4 is another diagram illustrating a method for determining a size of a data block according to an embodiment of the present invention;
fig. 5 is a schematic diagram of the structure of a base station in the embodiment of the present invention;
FIG. 6 is another schematic diagram of the mechanism of the base station in the embodiment of the present invention;
FIG. 7 is another diagram illustrating the structure of a base station according to an embodiment of the present invention;
fig. 8 is a schematic diagram of the structure of a down-regulation value determination unit in the embodiment of the present invention;
fig. 9 is another schematic diagram of the structure of the down value determination unit in the embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a method and a base station for determining the size of a transmission block, which are used for adjusting the size of a data block under the condition that the base station meets the service quality requirement of the current service, and can effectively reduce power consumption, improve energy efficiency and improve the performance of a system.
Referring to fig. 1, an embodiment of a method for determining a size of a data block according to an embodiment of the present invention includes:
101. determining a first TBS according to the selected CQI value and the selected code channel number in the current transmission time interval;
in the embodiment of the present invention, in a current Transmission Time Interval (TTI), the base station determines the first TBS according to the selected CQI value and the selected number of code channels.
In the embodiment of the invention, the user equipment can detect the channel quality of the channel where the user is located, and carry the channel quality detection result in the subframe to feed back to the base station, wherein the channel quality detection result comprises a CQI value, rank indication information and the like.
In the embodiment of the present invention, the determining, by the base station, the selected CQI value and the selected code channel number may be obtained by TFRC selection, which specifically includes: the base station may calculate a maximum available CQI value of the user equipment according to the CQI value reported by the UE and the current available power, then determine a maximum available code channel number of the user according to the code channel resource and the maximum available CQI value, determine a maximum available TBS by using the maximum available CQI value and the maximum available code channel number, determine a CQI value and a code channel number according to the maximum available TBS and a current buffer data stream of the system, and perform CQI reduction processing on the determined CQI value and the code channel number to obtain a selected CQI value and a selected code channel number, which is a content in the prior art and will not be described in more detail herein.
The base station may further obtain the determined selected CQI value and the selected number of code channels through another TFRC selection, specifically: the base station can calculate to obtain the maximum available CQI value of the user equipment according to the CQI value reported by the UE and the current available power, then determine the maximum available code channel number of the user according to the code channel resource and the maximum available CQI value, process the CQI for the maximum available CQI value and the code channel number, determine the processed CQI value, the code channel number and the TBS, and determine the selected CQI value and the selected code channel number according to the determined TBS and the current buffer data amount of the system.
In the embodiment of the invention, the base station also selects the minimum code channel number as the selected code channel number from the maximum code channel number supported by the maximum capability of the user equipment, the currently available continuous code channel number and the selected maximum code channel number supported by the CQI value.
102. And determining a second TBS according to the selected CQI value, the first TBS and the service quality requirement of the current service.
In the embodiment of the present invention, the base station may determine the second TBS according to the selected CQI value, the first TBS, and the service quality requirement of the current service, where the service quality of the current service is related to the factors such as throughput and delay of the current service.
Preferably, in the embodiment of the present invention, before the base station determines the second TBS according to the selected CQI value, the first TBS, and the qos requirement of the current service in step 102, it may further be determined whether the amount of the buffered data in the current TTI is greater than a preset fifth value, and if so, the content in step 102 is continuously executed.
Preferably, in the embodiment of the present invention, before the base station determines the second TBS according to the selected CQI value, the first TBS, and the qos requirement of the current service in step 102, the base station may further determine whether the priority of the user corresponding to the current service is greater than or equal to a preset priority, if so, the content in step 102 is continuously executed, or before the base station executes step 102, if it is determined that the amount of the buffered data in the current TTI is greater than a preset fifth value, the base station may further determine whether the priority of the user corresponding to the current service is greater than or equal to the preset priority after determining that the amount of the buffered data in the current TTI is greater than the preset fifth value, and if so, the content in step 102 is continuously executed, wherein the base station may determine the amount of the buffered data in the current TTI by counting the size of the buffered data in its buffer.
In the embodiment of the invention, after the base station determines the first TBS according to the selected CQI value and the selected code channel number, the second TBS is determined according to the selected CQI value, the first TBS and the service quality requirement of the current service, so that the TBS can be adjusted, the power consumption is reduced and the system efficiency is improved under the condition of meeting the service quality requirement of the current service.
To better understand the technical solution in the embodiment of the present invention, please refer to fig. 2, which is an embodiment of a method for determining a size of a transport block in the embodiment of the present invention, including:
201. in the current TTI, determining the size TBS of a first transmission block according to the selected CQI value and the selected code channel number;
step 201 is similar to that described in step 101 in the embodiment shown in fig. 1, and is not described herein again.
202. Determining a third TBS by using the selected CQI value and a difference value obtained by a preset maximum value allowed by the CQI value to be adjusted downwards;
in the embodiment of the present invention, the base station determines the third TBS by using a difference obtained by using the selected CQI value and a preset maximum allowed CQI value for down-regulation, specifically: the base station may subtract the preset maximum allowed downward adjustment value of the CQI value from the selected CQI value to obtain a first CQI value, for example, if the selected CQI value is 30 and the preset maximum allowed downward adjustment value of the CQI value is 5, the first CQI value is 25; after obtaining the first CQI value, the base station searches a preset TBS table, and determines that the TBS corresponding to the first CQI value and the selected number of channels is a third TBS, where the preset TBS table includes a correspondence between CQI values, the number of channels, and TBS.
It should be noted that, in the embodiment of the present invention, the preset CQI value may be set according to the service type of the current service.
203. Determining a fourth TBS according to the service quality requirement of the current service;
in the embodiment of the present invention, the base station may determine the fourth TBS according to a service quality requirement of the current service, where if the current service is a throughput sensitive service, the service quality requirement of the current service is that an estimated transmission rate of the current service is greater than a preset first value, and if the current service is a delay sensitive service, the service quality requirement of the current service is that a delay value of the current service is less than a preset second value.
In the embodiment of the present invention, the determining, by the base station, the fourth TBS according to the quality of service requirement of the current service specifically includes: if the current service is a throughput sensitive service, when it is determined that the estimated sending rate of the current service is greater than a preset first value, calculating a first value range of a TBS, then searching a preset TBS table, and determining that a minimum TBS corresponding to the selected number of code channels in the calculated first value range of the TBS is a fourth TBS, for example, the calculated first value range of the TBS is that the TBS is greater than 50, and in the preset TBS table, the TBS corresponding to the selected number of code channels includes: 38. 45, 52, 56, 70, the fourth TBS is determined to be 52.
It should be noted that, in the embodiment of the present invention, the estimated sending rate of the current service may be obtained by using the following calculation method:
wherein r ispredict(T) estimated sending rate of current service, TCTo smooth the time constant, Ri(t-1) is the instantaneous rate at which queue i is actually scheduled in the t-1 TTI, ri(t-1) is the alpha filtering rate that queue i has reached in the t-1 TTI, TBS is said rpredict(t) the corresponding TBS;
in the embodiment of the present invention, the preset first value is related to the preset current service guaranteed bit rate, and specifically, the first value may be set to be equal to a constant multiple of the preset current service guaranteed bit rate, where the constant is a constant greater than 1, for example, the first value is equal to 10.5 times GBR.
In the embodiment of the present invention, after the base station calculates the estimated sending rate of the current service, the estimated sending rate may be greater than a preset first value, that is: r ispredict(t)>a×SGBRThe base station may obtain a first value range of the TBS by solving the inequality, where rpredict(t) is the estimated sending rate of the current service, a is a constant multiple of the preset GBR, SGBRGBR preset for current traffic.
In the embodiment of the present invention, the determining, by the base station, the fourth TBS according to the quality of service requirement of the current service specifically includes: if the current service is a delay sensitive service, when the base station determines that the estimated delay value of the current service is smaller than a preset second value, calculating to obtain a second value range of the TBS, searching a preset TBS table, and determining that the minimum TBS corresponding to the selected number of code channels in the second value range of the TBS is a fourth TBS, for example, the calculated first value range of the TBS is that the TBS is larger than 50, and in the preset TBS table, the TBS corresponding to the selected number of code channels includes: 38. 45, 52, 56, 70, the fourth TBS is determined to be 52.
It should be noted that, in the embodiment of the present invention, the estimated delay value of the current service may be obtained by using the following calculation method:
wherein, TimeiThe estimated delay value of the current service, Q (T) is the queue length of the queue i in the T-th TTI, U (T) is the buffer data volume of the queue i in the T-th TTI, and TCTo smooth the time constant, Ri(t-1) is the instantaneous rate at which queue i is actually scheduled in the t-1 TTI, ri(t-1) is the alpha filtering rate achieved by queue i in the t-1 TTI, and TBS is rpredict(t) the corresponding TBS.
In the embodiment of the invention, the preset second value is the preset maximum Time delay of the current service, and the base station can enable the estimated Time delay value of the current service to be smaller than the maximum Time delay of the current service, namely enable the Timei<DiSolving the inequality can obtain a second value range of the TBS, wherein the Time isiEstimated delay value for current traffic, DiIs the preset maximum time delay value of the current service.
204. Selecting a minimum value from a maximum value of a third TBS and a fourth TBS and the first TBS as the second TBS.
In the embodiment of the present invention, after determining the third TBS and the fourth TBS, the base station selects a minimum value from the maximum value of the third TBS and the fourth TBS and the first TBS as the second TBS, that is:
second TBS = min { max (third TBS, fourth TBS), first TBS }
In the embodiment of the invention, the base station determines the first TBS by using the selected CQI value and the selected number of code channels, determines the third TBS by using the selected CQI value and the maximum value allowed to be adjusted downwards by the preset CQI value, determines the fourth TBS by using the service quality requirement of the current service, and finally selects the minimum value from the maximum value of the third TBS and the fourth TBS and the first TBS as the second TBS.
It should be noted that in the embodiment of the present invention, the embodiment shown in fig. 2 is to determine a second TBS from the calculated TBSs, and a method for determining the second TBS by determining a value of a selected CQI value that needs to be adjusted downward will be described below, and referring to fig. 3, an embodiment of the method for determining a data block size in the embodiment of the present invention includes:
301. in the current TTI, determining a first transport block size TBS according to the selected CQI value and the selected code channel number, and continuing to execute step 302 after n = 0;
in the embodiment of the invention, in the current TTI, the base station determines the first TBS according to the selected CQI value and the selected code channel number.
In the embodiment of the present invention, the user equipment may detect the channel quality of the channel where the user is located, and carry the result of the channel quality detection in the subframe to feed back to the base station, where the result of the channel quality detection includes a CQI value, rank indication information, and the like, the base station may calculate the CQI value that is the maximum usable CQI value of the user equipment according to the CQI value reported by the UE and the current available power, and the CQI value that is the maximum usable CQI value of the user equipment is the selected CQI value in the embodiment of the present invention.
In the embodiment of the invention, the base station also selects the minimum code channel number as the selected code channel number from the maximum code channel number supported by the maximum capability of the user equipment, the currently available continuous code channel number and the selected maximum code channel number supported by the CQI value.
It should be noted that, in the embodiment of the present invention, the selected CQI value and the selected number of code channels are determined in the prior art, and will not be discussed in more detail here.
In the embodiment of the present invention, after the base station determines the first TBS, the base station determines a value that the selected CQI value needs to be adjusted downward according to the selected CQI value, the first TBS, the service quality requirement of the current service, and a preset maximum value that the CQI value allows to be adjusted downward, specifically: let the initial value of n be 0, go from step 302 to step 306.
302. Determining a CQI (n) equal to the selected CQI value minus n times the preset CQI down-regulation value;
in the embodiment of the present invention, the base station determines that CQI (n) is equal to the selected CQI value minus n times the preset CQI down-regulation value, for example, if the preset CQI down-regulation value may be 1, CQI (n) is equal to the selected CQI value minus n, and when n is equal to 0, CQI (0) is the selected CQI value.
303. Judging whether the n times of preset CQI down-regulation value is less than or equal to the maximum value of preset CQI value allowed to be down-regulated, if so, executing a step 304, otherwise, executing a step 306;
in the embodiment of the present invention, the base station determines whether the n times of the preset CQI down-regulation value is less than or equal to the maximum value of the preset CQI value allowed to be down-regulated, if the n times of the preset CQI down-regulation value is less than or equal to the maximum value of the preset CQI value allowed to be down-regulated, the base station will continue to execute step 304, and if the n times of the preset CQI down-regulation value is greater than the maximum value of the preset CQI value allowed to be down-regulated, the base station continues to execute step 306.
304. Judging whether the estimated sending rate or the estimated time delay value obtained according to the CQI (n) and the service quality requirement of the current service meets the preset condition, if so, executing a step 305, and if not, executing a step 306;
in the embodiment of the invention, when the n times of the preset CQI down-regulation value is less than or equal to the maximum value of the preset CQI value allowed to be down-regulated, the base station continuously judges whether the estimated sending rate or the estimated time delay value obtained according to the CQI (n) and the service quality requirement of the current service meets the preset condition.
In the embodiment of the present invention, the specific manner of obtaining whether the estimated sending rate or the estimated delay value meets the preset condition according to the cqi (n) and the service quality requirement of the current service is related to whether the current service is a throughput sensitive service or a delay sensitive service, if the current service is a throughput sensitive service, it needs to be determined whether the estimated sending rate obtained according to the cqi (n) is greater than a preset third value, and if the preset condition is met, the estimated sending rate is greater than the preset third value; if the current service is delay sensitive, whether the estimated delay value obtained according to the cqi (n) is smaller than a preset fourth value needs to be judged, and if the preset condition is met, the estimated delay value is smaller than the preset fourth value.
Specifically, in the embodiment of the present invention, when the current service is a throughput-sensitive service, the method for the base station to determine whether the estimated sending rate obtained according to the cqi (n) is greater than the preset third value includes: the base station searches a preset TBS table, determines TBS corresponding to CQI (n) and the selected code channel number as TBS (n), and the preset TBS table comprises the corresponding relation among the CQI, the code channel number and the TBS; the base station obtains the estimated sending rate of the current TTI according to the searched tbs (n) and the historical sending rate, and determines whether the estimated sending rate is greater than a preset third value, wherein if the current TTI is the tth TTI, the historical sending rate refers to an average sending rate of a plurality of TTIs before the tth TTI, the preset third value is related to the GBR corresponding to the current service and can be an integral multiple of the GBR corresponding to the current service, for example, the preset third value can be 1.05 times of the GBR of the current service or 1.08 times of the GBR of the current service, it should be noted that the GBR of the current service is a preset value, and the multiple of the GBR of the current service in the third value is greater than 1.
Preferably, in the embodiment of the present invention, the base station may determine the estimated transmission rate of the current TTI by using the following formula:
wherein r (t-1) is the historical transmission rate,for estimated transmission rate, TCTo smooth the time constant, Ri(t-1) is the instantaneous rate at which queue i is actually scheduled in the t-1 TTI, ri(T-1) is the alpha filtering rate achieved by queue i in the T-1 TTI, and TBS (n) is the TBS (n) obtained by looking up the TBS table, where r (T-1) = (1-1/T)C)×ri(t-1)+Ri(t-1)/TC。
In the embodiment of the present invention, if the preset sending rate is greater than a preset third value, the estimated sending rate satisfies a preset condition, where the preset third value is set in relation to GBR, and the preset third value may be a multiple of GBR, for example, the preset third value is equal to 1.05 times of GBR, or the preset third value is equal to 1.1 times of GBR, it should be noted that, in practical applications, the multiple relationship between the third value and GBR may be set according to specific needs, and is not limited herein.
In the embodiment of the present invention, when the current service is a delay sensitive service, the method for the base station to determine whether the estimated delay value obtained according to the cqi (n) is smaller than the preset fourth value includes: the base station searches a preset TBS table, determines TBS corresponding to CQI (n) and the selected code channel number as TBS (n), obtains a preset time delay value of the current TTI according to the TBS (n) and the historical sending rate, and judges whether the estimated time delay value is smaller than a preset fourth numerical value.
Preferably, the base station may determine the estimated delay value for the current TTI using the following formula:
wherein,for the estimated delay value, Q (t) is the queue length of the queue i in the t-th TTI, U (t) is the buffer data amount of the queue i in the t-th TTI,and TCTo smooth the time constant, Ri(t-1) is the instantaneous rate at which queue i is actually scheduled in the t-1 TTI, ri(t-1) is the alpha filtering rate achieved by queue i in the t-1 TTI, and TBS (n) isCorresponding TBS (n), r (T-1) is the historical transmission rate, where r (T-1) ═ 1-1/TC)×ri(t-1)+Ri(t-1)/TC。
In the embodiment of the present invention, if the estimated delay value is smaller than a preset fourth value, the preset delay value meets a preset condition, where the preset fourth value may be the maximum delay of the current service, for example, if the maximum delay of the current service is 0.2ms, the fourth value may be set to 0.2ms, and when the estimated delay value is 0.1ms, the estimated delay value meets the preset condition.
305. Let n = n +1, return to execute step 302;
in the embodiment of the present invention, when the estimated sending rate is greater than the preset third value or the estimated delay value is less than the preset fourth value, the base station makes n = n +1, and returns to execute step 302.
306. Determining n-1 times of preset CQI down-regulation value as the value of the selected CQI to be down-regulated;
in the embodiment of the invention, when the preset CQI down-regulation value n times is greater than the maximum allowed down-regulation of the CQI, or when the preset CQI down-regulation value n times is less than or equal to the maximum allowed down-regulation of the CQI and the estimated sending rate is less than or equal to a preset third value, or when the preset CQI down-regulation value n times is less than or equal to the maximum allowed down-regulation of the CQI and the estimated delay value is greater than or equal to a preset fourth value, the base station determines that the preset CQI down-regulation value n-1 times is a selected value that the CQI needs to be down-regulated.
307. Subtracting the value of the selected CQI value which needs to be adjusted downwards from the selected CQI value to obtain an actual CQI value;
in the embodiment of the invention, the base station subtracts the value of the selected CQI value which needs to be adjusted downwards from the selected CQI value to obtain an actual CQI value, and the base station can determine the second TBS by using the actual CQI value.
308. And determining the second TBS according to the actual CQI value and the selected code channel number.
In the embodiment of the present invention, the base station determines the second TBS according to the actual CQI value and the selected number of code channels, specifically: the base station will query a preset TBS table and determine the TBS corresponding to the actual CQI value and the selected number of code channels as the second TBS.
In the embodiment of the present invention, in the preset TBS table, when the CQI value and the TBS are fixed, the corresponding number of code channels may have different values, for example, the corresponding relationship between the CQI value, the number of code channels, and the TBS in the TBS may be 30:15:40 or 30:14:40, so that when the CQI value is 30 and the TBS is 40, the number of code channels may be 15 or 14. Therefore, in the embodiment of the present invention, code channel resources can be saved by reducing the number of code channels, which specifically includes: the base station searches a preset TBS table to obtain a set of code channel numbers corresponding to the actual CQI value and the second TBS, and selects the minimum code channel number from the set as the actual code channel number so as to save code channel resources and fully utilize the code channel resources.
Preferably, in this embodiment of the present invention, before the base station performs step 302, it may further determine whether to adjust the TBS according to the buffer data size of the current TTI and/or the priority of the user corresponding to the current service, and specifically, the TBS may be adjusted according to: the base station determines whether the amount of the cache data in the current TTI is greater than a preset fifth value, if the amount of the cache data in the current TTI is greater than the preset fifth value, the step 302 is continuously performed, or if the amount of the cache data in the current TTI is greater than the preset fifth value, the step 302 is continuously performed, if the priority of the user corresponding to the current service is greater than or equal to the preset priority, the step 302 is continuously performed, or the base station determines whether the priority of the user corresponding to the current service is greater than or equal to the preset priority, if the priority of the user corresponding to the current service is greater than or equal to the preset priority, the step 302 is continuously performed.
In the embodiment of the present invention, the first, second, third, fourth, and fifth values are only used to distinguish different values, and are not used to limit the present embodiment.
In the embodiment of the invention, the base station can determine the first TBS according to the selected CQI value and the selected code channel number, determine the numerical value required to be adjusted downwards of the selected CQI value according to the first TBS, the selected CQI and the service quality requirement of the current service to obtain the actual CQI value, obtain the second TBS according to the actual CQI value, transmit data according to the second TBS, can effectively reduce the power consumption and improve the energy efficiency, and can adjust the code channel number according to the actual CQI value and the second TBS to save the code channel resource so that the code channel resource is fully utilized.
In the embodiment shown in fig. 3, the manner of determining the selected CQI value to be adjusted downward by a loop judgment to obtain the second TBS is described below, and a method for determining the second TBS by determining the downward adjustment multiple of the first TBS by the base station is described below, please refer to fig. 4, which is an embodiment of the method for determining the size of the data block in the embodiment of the present invention, and includes:
401. determining a first TBS according to the selected CQI value and the selected code channel number in the current transmission time interval;
step 401 is similar to that described in step 101 in the embodiment shown in fig. 1, and is not described here again.
402. Determining the multiple of the first TBS needing to be adjusted downwards according to the service quality requirement of the current service;
in the embodiment of the present invention, the base station determines the multiple of the first TBS that needs to be adjusted downward according to the service quality requirement of the current service, wherein the service quality requirement of the current service is related to the factors such as throughput, delay, and the like of the current service.
In the embodiment of the invention, if the current service is a throughput sensitive service, the base station determines the multiple of the first TBS needing to be adjusted downwards according to the relation between the historical sending rate of the current service and the preset GBR of the preset multiple, and specifically, if the current service is the throughput sensitive service, the base station determines the historical sending rate of the current service; if the historical sending rate of the current service is greater than the preset guaranteed bit rate GBR of the preset multiple, determining that the multiple of the first TBS needing to be adjusted downwards is equal to the preset GBR of the sending rate divided by the preset multiple; and if the historical sending rate of the current service is less than or equal to the preset GBR of the preset multiple, determining that the multiple of the first TBS needing to be adjusted downwards is 1.
The base station can determine the historical sending rate of the current service according to the following modes:
r(t-1)＝(1-1/TC)×ri(t-1)+Ri(t-1)/TC
wherein r (T-1) is the historical transmission rate, TCTo smooth the time constant, Ri(t-1) is the instantaneous rate at which queue i is actually scheduled in the t-1 TTI, ri(t-1) is the alpha filtering rate that queue i has reached in the t-1 TTI.
It should be noted that, in the embodiment of the present invention, if the current service is a non-throughput-sensitive service, it is not necessary to determine the multiple by which the first TBS needs to be adjusted downward according to the relationship between the current historical transmission rate and the preset GBR of the preset multiple.
In the embodiment of the invention, if the current service is a delay sensitive service, the base station determines the multiple of the first TBS needing to be adjusted downwards according to the relation between the historical delay value of the current service and the maximum delay value preset by the current service, and specifically, if the current service is the delay sensitive service, the base station determines the historical delay value of the current service; if the historical time delay value of the current service is smaller than the preset maximum time delay value of the current service, determining that the down-regulation multiple of the first TBS is equal to the product of the preset maximum time delay value of the current service divided by the historical time delay value of the current service and a preset constant value; and if the historical time delay value of the current service is greater than or equal to the preset time delay value of the current service, the down-regulation multiple of the first TBS is equal to 1.
The base station can determine the historical time delay value of the current service according to the following modes:
Timei＝(Q(t)+U(t))/r(t-1)
wherein,for the historical delay value of the current service, r (T-1) is the transmission rate of the T-1 th TTI, Q (T) is the queue length of the queue i in the T-th TTI, U (T) is the buffer data volume of the queue i in the T-th TTI, and r (T-1) ═ 1-1/TC)×ri(t-1)+Ri(t-1)/TCWherein, TCTo smooth the time constant, Ri(t-1) is the instantaneous rate at which queue i is actually scheduled in the t-1 TTI, ri(t-1) is the alpha filtering rate that queue i has reached in the t-1 TTI.
It should be noted that, in the embodiment of the present invention, if the current service is a delay insensitive service, it is not necessary to determine the multiple of the first TBS that needs to be adjusted downward according to the relationship between the historical delay value of the current service and the maximum delay value preset by the current service.
403. Determining the maximum value of the selected CQI value to be adjusted downwards according to the multiple of the first TBS to be adjusted downwards and the first TBS;
in the embodiment of the present invention, after determining the multiple of the first TBS that needs to be adjusted downward, the base station determines the maximum value of the selected CQI value adjusted downward according to the multiple of the first TBS that needs to be adjusted downward and the first TBS, specifically: the base station can determine a fifth TBS by utilizing the multiple of the first TBS needing to be adjusted downwards and the first TBS, and searches a second CQI value corresponding to the fifth TBS and the selected code channel number in a preset TBS table; and determining that the difference between the selected CQI value and the second CQI value is the maximum value of the selected CQI value down-adjustment, e.g., if the first TBS needs to be adjusted down by a multiple of 2, and the first TBS is 50, the fifth TBS is 25; when the second CQI value corresponding to the first TBS and the selected number of code channels is 30 and the selected CQI value is 37, the maximum value of the selected CQI value down-regulation is 7.
404. Selecting a minimum value from the maximum value of the selected downward regulation of the CQI value and the maximum value of the preset CQI value allowed to be downward regulated as a numerical value of the selected CQI value needing to be downward regulated;
in the embodiment of the present invention, the base station selects the minimum value from the maximum value of the selected CQI value down-regulation and the maximum value of the preset CQI value allowed down-regulation as the value of the selected CQI value that needs to be down-regulated, for example, if the maximum value of the selected CQI value down-regulation is 7 and the maximum value of the preset CQI value allowed down-regulation is 5, it is determined that the value of the selected CQI value that needs to be down-regulated is 5.
405. Subtracting the value of the selected CQI value which needs to be adjusted downwards from the selected CQI value to obtain an actual CQI value;
in the embodiment of the invention, the base station subtracts the value of the selected CQI value which needs to be adjusted downwards from the selected CQI value to obtain an actual CQI value, and the base station can determine the second TBS by using the actual CQI value.
406. And determining the second TBS according to the actual CQI value and the selected code channel number.
In the embodiment of the present invention, the base station determines the second TBS according to the actual CQI value and the selected number of code channels, and specifically, the base station may determine the TBS corresponding to the actual CQI value and the selected number of code channels as the second TBS by searching a preset TBS table.
In the embodiment of the present invention, in the preset TBS table, when the CQI value and the TBS are fixed, the corresponding number of code channels may have different values, for example, the corresponding relationship between the CQI value, the number of code channels, and the TBS in the TBS may be 30:15:40 or 30:14:40, so that when the CQI value is 30 and the TBS is 40, the number of code channels may be 15 or 14. Therefore, in the embodiment of the present invention, code channel resources can be saved by reducing the number of code channels, which specifically includes: the base station searches a preset TBS table to obtain a set of code channel numbers corresponding to the actual CQI value and the second TBS, and selects the minimum code channel number from the set as the actual code channel number so as to save code channel resources and fully utilize the code channel resources.
Preferably, in this embodiment of the present invention, before the base station performs step 402, it may further determine whether to adjust the TBS according to the buffer data size of the current TTI and/or the priority of the user corresponding to the current service, and specifically, the TBS may be adjusted according to: the base station determines whether the amount of the cache data in the current TTI is greater than a preset fifth value, if the amount of the cache data in the current TTI is greater than the preset fifth value, the step 402 is continuously performed, or if the amount of the cache data in the current TTI is greater than the preset fifth value, the step 402 is continuously performed, if the priority of the user corresponding to the current service is greater than or equal to the preset priority, the step 402 is continuously performed, or the base station determines whether the priority of the user corresponding to the current service is greater than or equal to the preset priority, if the priority of the user corresponding to the current service is greater than or equal to the preset priority, the step 402 is continuously performed.
In the embodiment of the present invention, the first, second, third, fourth, and fifth values are only used to distinguish different values, and are not used to limit the present embodiment.
In the embodiment of the invention, the base station determines the second TBS by determining the down-regulation multiple of the first TBS according to the service quality requirement of the current service, can adjust the TBS under the condition of meeting the service quality requirement of the current service, reduce the power consumption of the system and improve the energy efficiency, and can also adjust the number of code channels after determining the second TBS, thereby effectively saving the code channel resources by reducing the number of the code channels, realizing the full utilization of the code channel resources and improving the performance of the system.
Referring to fig. 5, an embodiment of a base station in the embodiment of the present invention includes:
a first determining unit 501, configured to determine a first transport block size TBS according to a selected CQI value and a selected number of code channels in a current TTI;
a second determining unit 502, configured to determine a second TBS according to the selected CQI value, the first TBS, and a quality of service requirement of a current service after the first determining unit 501 determines the first TBS.
In the embodiment of the present invention, in the current TTI, the first determining unit 501 determines the first TBS according to the selected CQI value and the selected number of code channels, and then the second determining unit determines the second TBS according to the selected CQI value, the first TBS and the qos requirement of the current service.
In the embodiment of the invention, the base station adjusts the first TBS according to the selected CQI value, the first TBS and the service quality requirement of the current service to obtain the second TBS, so that the second TBS can be obtained under the condition of meeting the service quality requirement of the current service, the power consumption is effectively reduced, and the energy efficiency is improved.
For better understanding of the base station in the embodiment of the present invention, please refer to fig. 6, which is an embodiment of the base station in the embodiment of the present invention, including:
the first determining unit 501 and the second determining unit 502 in the embodiment shown in fig. 5 are similar to those described in fig. 5, and are not repeated here.
Wherein the second determining unit 502 includes:
a third TBS determining unit 601, configured to determine a third TBS by using the selected CQI value and a difference obtained by a maximum allowed downward adjustment of a preset CQI value after the first TBS is determined by the first determining unit;
the third TBS determination unit 601 is specifically configured to subtract a preset maximum allowed downward adjustment value of the CQI value from the selected CQI value to obtain a first CQI value; and searching a preset TBS table, and determining the TBS corresponding to the first CQI value and the selected code channel number as a third TBS, wherein the preset TBS table comprises the corresponding relation among the CQI value, the code channel number and the TBS.
A fourth TBS determining unit 602, configured to determine a fourth TBS according to the service quality requirement of the current service after the third TBS is determined by the third TBS determining unit;
the fourth TBS determining unit 602 is specifically configured to, if the current service is a throughput sensitive service, determine that the estimated sending rate of the current service is greater than a preset first value, and calculate a first value range of the TBS; searching a preset TBS table, determining that the minimum TBS corresponding to the selected code channel number in the first value range of the TBS is a fourth TBS, or calculating to obtain a second value range of the TBS when determining that the estimated delay value of the current service is smaller than a preset second value if the current service is a delay sensitive service; and searching a preset TBS table, and determining that the minimum TBS corresponding to the selected code channel number in the second value range of the TBS is the fourth TBS, wherein the preset TBS table comprises the corresponding relation among the CQI value, the code channel number and the TBS.
A second TBS determining unit 603, configured to select a minimum value from the maximum value of the third TBS and the fourth TBS and the first TBS as the second TBS after the fourth TBS is determined by the fourth TBS determining unit.
Preferably, in this embodiment of the present invention, the base station may further include:
a set obtaining unit 604, configured to, after the second determining unit determines the second TBS, search the preset TBS table to obtain a set of code channel numbers corresponding to the actual CQI value and the second TBS;
a code channel selecting unit 605, configured to select a minimum code channel number from the set as an actual code channel number after the set of code channel numbers is acquired by the set acquiring unit.
In the embodiment of the present invention, in the current TTI, the first determining unit 501 determines the first TBS according to the selected CQI value and the selected number of code channels, then the third TBS determining unit 601 determines the third TBS by using the selected CQI value and the difference obtained by the maximum allowed downward adjustment of the preset CQI value, and the fourth TBS determining unit 602 determines the fourth TBS according to the qos requirement of the current service; then, the second TBS determining unit 603 selects the minimum value from the maximum value of the third TBS and the fourth TBS and the first TBS as the second TBS, and the set obtaining unit 604 may also search the preset TBS table to obtain the set of the actual CQI value and the number of code channels corresponding to the second TBS; finally, the code channel selecting unit 605 selects the smallest number of code channels from the set as the actual number of code channels.
In the embodiment of the invention, the base station determines the first TBS by utilizing the selected CQI value and the selected code channel number, determines the third TBS by utilizing the selected CQI value and the maximum value allowed to be adjusted downwards by the preset CQI value, determines the fourth TBS by utilizing the service quality requirement of the current service, and finally selects the minimum value from the maximum value of the third TBS and the fourth TBS and the first TBS as the second TBS.
Referring to fig. 7, an embodiment of a base station in the embodiment of the present invention includes:
the first determining unit 501 and the second determining unit 502 in the embodiment shown in fig. 5 are similar to those in the embodiment shown in fig. 5, and are not described again here.
Wherein the second determination unit includes:
a down-adjustment value determining unit 701, configured to determine, after the first determining unit determines the first TBS, a value that needs to be adjusted down for the selected CQI value according to the selected CQI value, the first TBS, the qos requirement of the current service, and a preset maximum allowed down-adjustment CQI value;
an actual CQI value calculating unit 702, configured to subtract the value of the selected CQI value that needs to be adjusted downward from the selected CQI value to obtain an actual CQI value after the adjustment value determining unit determines the value of the selected CQI value that needs to be adjusted downward;
a third determining unit 703 is configured to determine, after the actual CQI value is obtained by calculation of the actual CQI value calculating unit, a second TBS according to the actual CQI value and the selected number of code channels.
Preferably, in this embodiment of the present invention, the base station may further include:
a set obtaining unit 604, configured to, after the second determining unit determines the second TBS, search the preset TBS table to obtain a set of code channel numbers corresponding to the actual CQI value and the second TBS;
a code channel selecting unit 605, configured to select a minimum code channel number from the set as an actual code channel number after the set of code channel numbers is acquired by the set acquiring unit.
In the embodiment of the present invention, in the current TTI, the first determining unit 501 determines the first TBS according to the selected CQI value and the selected number of code channels, and then the down-regulation value determining unit 701 determines the value of the selected CQI value that needs to be down-regulated according to the selected CQI value, the first TBS, the service quality requirement of the current service, and the maximum allowed down-regulation value of the preset CQI value; the actual CQI value calculating unit 702 subtracts the value of the selected CQI value that needs to be adjusted downward from the selected CQI value to obtain the actual CQI value; then, the third determining unit 703 determines a second TBS according to the actual CQI value and the selected number of code channels, and the set obtaining unit 604 may further search a preset TBS table to obtain a set of code channels corresponding to the actual CQI value and the second TBS; finally, the code channel selecting unit 605 selects the smallest number of code channels from the set as the actual number of code channels.
In the embodiment of the invention, the base station can determine the first TBS according to the selected CQI value and the selected code channel number, determine the numerical value required to be adjusted downwards of the selected CQI value according to the first TBS, the selected CQI and the service quality requirement of the current service to obtain the actual CQI value, obtain the second TBS according to the actual CQI value, transmit data according to the second TBS, can effectively reduce the power consumption and improve the energy efficiency, and can adjust the code channel number according to the actual CQI value and the second TBS to save the code channel resource so that the code channel resource is fully utilized.
To better understand the technical solution in the embodiment of the present invention, please refer to fig. 8, which is an embodiment of a structure of the down-regulation value determining unit 701 in the embodiment shown in fig. 7, including:
a fourth determining unit 801, configured to determine, after the first determining unit determines the first TBS, a CQI (n) equal to the selected CQI value minus n times a preset CQI down-regulation value, where n is 0 as a starting value;
a first determining unit 802, configured to determine, after the fourth determining unit determines the CQI (n), whether the n-fold CQI down-adjustment value is smaller than or equal to a maximum allowed down-adjustment value of the preset CQI value;
a second determining unit 803, configured to determine whether an estimated sending rate or an estimated delay value obtained according to the CQI (n) and the qos requirement of the current service meets a preset condition if the first determining unit determines that the n-fold preset CQI downlink value is smaller than or equal to a maximum allowed downlink value of the preset CQI value; wherein, satisfying the preset condition includes: the estimated sending rate is greater than the preset third value, or the estimated delay value is less than the preset fourth value. The second determining unit 803 is specifically configured to, when the first determining unit determines that the n-fold preset CQI down-regulation value is less than or equal to the maximum allowed down-regulation value of the preset CQI value, determine whether the estimated sending rate obtained according to the CQI (n) is greater than a preset third value if the current service is a throughput-sensitive service; or, if the current service is a delay sensitive service, judging whether the estimated delay value obtained according to the cqi (n) is smaller than a preset fourth value.
A CQI down-regulation determining unit 804, configured to make n = n +1 if the estimated sending rate or the estimated delay value determined by the second determining unit satisfies a preset condition, and return to the step of determining that the CQI (n) is equal to the selected CQI value minus n times the preset CQI down-regulation value; or, the second determining unit is configured to determine that the n-1 times of the preset CQI down-regulation value is a value that the selected CQI needs to be down-regulated if the preset sending rate or the estimated delay value determined by the second determining unit does not satisfy a preset condition.
In this embodiment of the present invention, the down-regulation value determining unit 701 is configured to, after the first determining unit 501 determines the first TBS, determine, according to the selected CQI value, the first TBS, the service quality requirement of the current service, and a preset maximum allowed down-regulation value of the CQI value, a value that the selected CQI value needs to be down-regulated, specifically: after the first determination unit 501 determines the first TBS, the fourth determination unit 801 determines a CQI (n) equal to the selected CQI value minus n times the preset CQI down value, where n has a starting value of 0; next, the first determining unit 802 determines whether the n-fold CQI down-regulation value is less than or equal to a preset maximum value allowed for the CQI down-regulation; if the first determining unit 802 determines that the n-fold preset CQI down-regulation value is less than or equal to the maximum value of the preset CQI value allowed to be down-regulated, the second determining unit 803 determines whether the estimated sending rate or the estimated delay value obtained according to the CQI (n) and the service quality requirement of the current service satisfies the preset condition; if the estimated sending rate or the estimated delay value determined by the second determining unit 803 satisfies the preset condition, the CQI down-regulation determining unit 804 makes n = n +1, returns to the fourth determining unit 801, and determines a preset CQI down-regulation value in which the CQI (n) is equal to the selected CQI value minus n times; or, if the second determining unit 803 determines that the obtained preset sending rate or the estimated delay value does not satisfy the preset condition, the CQI down-regulation value determining unit 804 determines that n-1 times of the preset CQI down-regulation value is a value that the selected CQI needs to be down-regulated.
In the embodiment of the present invention, a down-regulation value determining unit 701 in the base station may determine the value of the selected CQI that needs to be down-regulated by circularly detecting whether the n times of the preset CQI down-regulation value meets the qos requirement, so that the base station can reduce the selected CQI value under the condition that the qos requirement of the current service is met, and since the TBS is reduced along with the reduction of the CQI value, the power consumption can be reduced, the energy efficiency is improved, and the performance of the system is improved.
Referring to fig. 9, an embodiment of the structure of the down value determining unit 701 in the embodiment shown in fig. 7 includes:
a multiple calculating unit 901, configured to determine, after the first determining unit determines the first TBS, a multiple that the first TBS needs to be adjusted downward according to a quality of service requirement of the current service;
the multiple calculating unit 901 is specifically configured to, after the first determining unit determines the first TBS, determine a historical sending rate of a current service if the current service is a throughput-sensitive service; if the historical transmission rate is greater than a preset guaranteed bit rate GBR of a preset multiple, determining that the multiple of the first TBS required to be adjusted downwards is equal to the preset GBR of the historical transmission rate divided by the preset multiple, if the historical transmission rate is less than or equal to the preset GBR of the preset multiple, determining that the multiple of the first TBS required to be adjusted downwards is 1, or if the current service is a delay sensitive service, determining a historical delay value of the current service; if the historical time delay value is smaller than the preset maximum time delay value of the current service, determining that the down-regulation multiple of the first TBS is equal to the product of the preset maximum time delay value of the current service divided by the historical time delay value of the current service and a preset constant value; and if the historical time delay value is greater than or equal to the preset time delay value of the current service, the down-regulation multiple of the first TBS is equal to 1.
A down-adjustment value calculating unit 902, configured to determine, after the multiple calculating unit obtains the multiple that the first TBS needs to be down-adjusted, a maximum value of the selected CQI value down-adjustment according to the multiple that the first TBS needs to be down-adjusted and the first TBS;
the down adjustment calculating unit 902 is specifically configured to determine a fifth TBS by using the multiple of the first TBS that needs to be down adjusted and the first TBS; searching a second CQI value corresponding to the fifth TBS and the selected code channel number in the preset TBS table; determining that a difference between the selected CQI value and the second CQI value is a maximum value of the selected CQI value down.
A selecting unit 903, configured to select a minimum value from the maximum value of the selected CQI value down regulation and a preset maximum value of allowed CQI value down regulation after the down regulation calculating unit determines the maximum value of the selected CQI value down regulation, as a value of the selected CQI value that needs to be down regulated.
In this embodiment of the present invention, the down-regulation value determining unit 701 is configured to, after the first determining unit 501 determines the first TBS, determine, according to the selected CQI value, the first TBS, the service quality requirement of the current service, and a preset maximum allowed down-regulation value of the CQI value, a value that the selected CQI value needs to be down-regulated, specifically: after the first determining unit 501 determines the first TBS, the multiple calculating unit 901 determines the multiple that the first TBS needs to be adjusted downward according to the service quality requirement of the current service; next, the down-regulation calculating unit 902 determines the maximum value of the selected CQI value down-regulation according to the multiple of the first TBS that needs to be down-regulated and the first TBS; finally, the selecting unit 903 selects the minimum value from the maximum value of the selected downward adjustment of the CQI value and the maximum value of the preset allowed downward adjustment of the CQI value as the value of the selected CQI value to be downward adjusted.
In the embodiment of the present invention, the downward adjustment value determining unit 701 in the base station may determine the downward adjustment multiple of the first TBS under the condition that the requirement of the service quality of the current service is met, and determine the value of the selected CQI value that needs to be adjusted downward according to the downward adjustment multiple of the first TBS.
It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by hardware that is instructed to implement by a program, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
In summary, the method for determining the size of a data block and the base station provided by the present invention are described in detail, and a person skilled in the art may change the idea of the embodiment of the present invention in the specific implementation and the application scope.

Claims (20)

1. A method for determining a size of a block of data, comprising:
determining a first transport block size TBS according to the selected CQI value and the selected code channel number in the current transmission time interval TTI;
determining a second TBS according to the selected CQI value, the first TBS and the service quality requirement of the current service;
before determining a second TBS according to the selected CQI value, the first TBS, and the quality of service requirement of the current service, the method further comprises:
judging whether the cache data volume in the current TTI is larger than a preset fifth numerical value or not;
if yes, continuing to execute the step of determining a second TBS according to the selected CQI value, the first TBS and the service quality requirement of the current service;
said determining a second TBS based on said selected CQI value, said first TBS, and a current service quality requirement comprises:
determining a third TBS by using the selected CQI value and a difference value obtained by a maximum value allowed to be adjusted downwards by a preset CQI value;
determining a fourth TBS according to the service quality requirement of the current service;
selecting a minimum value from the first TBS and a maximum value of the third TBS and the fourth TBS as the second TBS; or,
said determining a second TBS based on said selected CQI value, said first TBS, and a quality of service requirement of a current service comprises:
determining a value of the selected CQI value to be adjusted downwards according to the selected CQI value, the first TBS, the service quality requirement of the current service and a preset maximum value of the allowed adjustment of the CQI value;
subtracting the value of the selected CQI value which needs to be adjusted downwards from the selected CQI value to obtain an actual CQI value;
and determining a second TBS according to the actual CQI value and the selected code channel number.
2. The method of claim 1, wherein the determining a third TBS using the selected CQI value and a difference between a preset CQI value and a maximum allowed downward adjustment value comprises:
subtracting the maximum value allowed to be adjusted downwards by the preset CQI value from the selected CQI value to obtain a first CQI value;
and searching a preset TBS table, and determining that the TBS corresponding to the first CQI value and the selected code channel number is a third TBS, wherein the preset TBS table comprises the corresponding relation among the CQI value, the code channel number and the TBS.
3. The method of claim 1, wherein the determining the fourth TBS according to the quality of service requirement of the current service comprises:
if the current service is a throughput sensitive service, calculating to obtain a first value range of the TBS when the estimated sending rate of the current service is determined to be greater than a preset first value;
and searching a preset TBS table, and determining that the minimum TBS corresponding to the selected code channel number in the first value range of the TBS is the fourth TBS, wherein the preset TBS table comprises a corresponding relation among the CQI value, the code channel number and the TBS.
4. The method of claim 1, wherein the determining the fourth TBS according to the quality of service requirement of the current service comprises:
if the current service is a delay sensitive service, calculating to obtain a second value range of the TBS when the estimated delay value of the current service is determined to be smaller than a preset second value;
and searching a preset TBS table, and determining that the minimum TBS corresponding to the selected code channel number in the second value range of the TBS is the fourth TBS, wherein the preset TBS table comprises a corresponding relation among the CQI value, the code channel number and the TBS.
5. The method of claim 1, wherein the determining the value of the selected CQI value that needs to be adjusted downward according to the selected CQI value, the first TBS, the quality of service requirement of the current service, and a preset maximum allowed downward adjustment of the CQI value comprises:
let n loop from 0 to perform the following steps:
determining a CQI (n) equal to the selected CQI value minus n times a preset CQI down value;
judging whether the n-time CQI down-regulation value is less than or equal to the maximum value of the preset CQI value allowed to be down-regulated;
if the n times of preset CQI down-regulation value is less than or equal to the maximum value of the preset CQI value allowed to be down-regulated, judging whether the estimated sending rate or the estimated time delay value obtained according to the CQI (n) and the service quality requirement of the current service meets the preset condition or not;
if the preset condition is met, making n be n +1, and returning to the step of executing the preset CQI down-regulation value that the CQI (n) is equal to the value obtained by subtracting n times from the selected CQI value;
and if the preset condition is not met, determining that the preset CQI down-regulation value which is n-1 times is the value required to be down-regulated by the selected CQI.
6. The method of claim 5, wherein the determining whether the estimated sending rate or the estimated delay value obtained according to the cqi (n) and the qos requirement of the current service satisfies a preset condition comprises:
if the current service is a throughput sensitive service, judging whether the estimated sending rate obtained according to the CQI (n) is greater than a preset third numerical value;
or,
if the current service is a delay sensitive service, judging whether the estimated delay value obtained according to the CQI (n) is smaller than a preset fourth numerical value.
7. The method of claim 6, wherein the determining whether the estimated sending rate obtained from the cqi (n) is greater than a preset third value comprises:
searching a preset TBS table, and determining TBS corresponding to the CQI (n) and the selected code channel number as TBS (n), wherein the preset TBS table comprises the corresponding relation among the CQI, the code channel number and the TBS;
obtaining the estimated sending rate of the current TTI according to the TBS (n) and the historical sending rate;
and judging whether the estimated sending rate is greater than the preset third numerical value or not.
8. The method of claim 6, wherein the determining whether the estimated delay value obtained from the cqi (n) is smaller than a preset fourth value comprises:
searching a preset TBS table, and determining TBS corresponding to the CQI (n) and the selected code channel number as TBS (n), wherein the preset TBS table comprises the corresponding relation among the CQI, the code channel number and the TBS;
obtaining the estimated time delay value of the current TTI according to the TBS (n) and the historical sending rate;
and judging whether the estimated time delay value is smaller than the preset fourth numerical value.
9. The method according to any one of claims 5 to 8, wherein the meeting of the preset condition comprises: the estimated sending rate is greater than the preset third value, or the estimated delay value is less than the preset fourth value.
10. The method of claim 1, wherein the determining the value of the selected CQI value that needs to be adjusted downward according to the selected CQI value, the first TBS, the quality of service requirement of the current service, and a preset maximum allowed downward adjustment of the CQI value comprises:
determining the multiple of the first TBS needing to be adjusted downwards according to the service quality requirement of the current service;
determining the maximum value of the selected downward adjustment of the CQI value according to the multiple of the first TBS to be downward adjusted and the first TBS;
and selecting the minimum value from the maximum value of the selected downward regulation of the CQI value and the maximum value of the preset downward regulation allowed by the CQI value as the value of the selected downward regulation required by the CQI value.
11. The method of claim 10, wherein the determining a multiple by which the first TBS needs to be adjusted downward based on the quality of service requirement of the current service comprises:
if the current service is a throughput sensitive service, determining the historical sending rate of the current service;
if the historical sending rate is greater than a preset guaranteed bit rate GBR of a preset multiple, determining that the multiple of the first TBS needing to be adjusted downwards is equal to the preset GBR of the historical sending rate divided by the preset multiple;
and if the historical sending rate is less than or equal to the preset multiple of GBR, determining that the multiple of the first TBS needing to be adjusted downwards is 1.
12. The method of claim 10, wherein the determining a multiple by which the first TBS needs to be adjusted downward based on the qos requirement of the current service comprises:
if the current service is a delay sensitive service, determining a historical delay value of the current service;
if the historical time delay value is smaller than the preset maximum time delay value of the current service, determining that the down-regulation multiple of the first TBS is equal to the product of the preset maximum time delay value of the current service divided by the historical time delay value of the current service and a preset constant value;
and if the historical time delay value is greater than or equal to the preset time delay value of the current service, the down-regulation multiple of the first TBS is equal to 1.
13. The method of claim 10, wherein the determining a maximum value for the selected CQI value down-adjustment based on a multiple of the first TBS required down-adjustment and the first TBS comprises:
determining a fifth TBS by using the multiple of the first TBS needing to be adjusted downwards and the first TBS;
searching a second CQI value corresponding to the fifth TBS and the selected code channel number in a preset TBS table;
determining that a difference between the selected CQI value and the second CQI value is a maximum value of the selected CQI value down.
14. The method of claim 1, wherein the determining a second TBS based on the actual CQI value and the selected number of code channels comprises:
and searching a preset TBS table, and determining the TBS corresponding to the actual CQI value and the selected code channel number as a second TBS, wherein the TBS table comprises the corresponding relation among the CQI value, the code channel number and the TBS.
15. The method of claim 1 or 14, wherein said determining a second TBS based on said actual CQI value and said selected number of code channels further comprises:
searching a preset TBS table to obtain a set of code channel numbers corresponding to the actual CQI value and the second TBS;
the minimum number of code channels from the set is selected as the actual number of code channels.
16. The method of claim 1, wherein before the determining whether the amount of buffered data in the current TTI is greater than a preset fifth value, the method further comprises:
judging whether the priority of the user corresponding to the current service is greater than or equal to a preset priority or not;
if yes, continuing to execute the step of judging whether the cache data volume in the current TTI is larger than a preset fifth numerical value.
17. A base station, comprising:
a first determining unit, configured to determine a first transport block size TBS according to a selected CQI value and a selected number of code channels in a current TTI;
a second determining unit, configured to determine, after the first determining unit determines the first TBS, a second TBS according to the selected CQI value, the first TBS, and a service quality requirement of a current service;
before determining a second TBS according to the selected CQI value, the first TBS, and the quality of service requirement of the current service, the method further comprises:
judging whether the cache data volume in the current TTI is larger than a preset fifth numerical value or not;
if yes, continuing to execute the step of determining a second TBS according to the selected CQI value, the first TBS and the service quality requirement of the current service;
the second determination unit includes:
a third TBS determining unit, configured to determine a third TBS by using the selected CQI value and a difference obtained from a maximum allowed downward adjustment of a preset CQI value after the first TBS is determined by the first determining unit;
a fourth TBS determining unit, configured to determine a fourth TBS according to a quality of service requirement of the current service after the third TBS is determined by the third TBS determining unit;
a second TBS determining unit, configured to select a minimum value from a maximum value of the third TBS and the fourth TBS and the first TBS as the second TBS after the fourth TBS is determined by the fourth TBS determining unit;
the second determination unit includes:
a down-regulation value determining unit, configured to determine, after the first determining unit determines the first TBS, a value that needs to be down-regulated for the selected CQI value according to the selected CQI value, the first TBS, the qos requirement of the current service, and a preset maximum value allowed to be down-regulated for the CQI value;
an actual CQI value calculating unit, configured to subtract the selected value of the CQI value that needs to be adjusted downward from the selected CQI value to obtain an actual CQI value after the adjustment value determining unit determines the value of the selected CQI value that needs to be adjusted downward;
and a third determining unit, configured to determine a second TBS according to the actual CQI value and the selected number of code channels after the actual CQI value is calculated by the actual CQI value calculating unit.
18. The base station of claim 17, wherein the down-regulation value determining unit comprises:
a fourth determining unit for determining CQI (n) equal to the selected CQI value minus n times a preset CQI down-regulation value after the first determining unit determines the first TBS, the starting value of n being 0;
a first judging unit, configured to judge whether the n-fold CQI down-regulation value is less than or equal to a maximum allowed down-regulation value of the preset CQI value after the fourth determining unit determines the CQI (n);
a second judging unit, configured to judge whether an estimated sending rate or an estimated delay value obtained according to the CQI (n) and a service quality requirement of the current service meets a preset condition if the first judging unit determines that the n-fold preset CQI down-regulation value is smaller than or equal to a maximum value that the preset CQI value allows to be down-regulated;
a CQI down-regulation determining unit, configured to, if the estimated sending rate or the estimated delay value determined by the second determining unit satisfies a preset condition, make n equal to n +1, and return to the step of determining that CQI (n) is equal to the estimated CQI down-regulation value obtained by subtracting n times from the selected CQI value; or, the second determining unit is configured to determine that the n-1 times of the preset CQI down-regulation value is a value that the selected CQI needs to be down-regulated if the preset sending rate or the estimated delay value determined by the second determining unit does not satisfy a preset condition.
19. The base station of claim 17, wherein the down-regulation value determining unit comprises:
a multiple calculating unit, configured to determine, after the first determining unit determines the first TBS, a multiple that the first TBS needs to be adjusted downward according to a quality of service requirement of the current service;
a down-regulation calculating unit, configured to determine, after the multiple calculating unit obtains the multiple that needs to be down-regulated for the first TBS, a maximum value of the selected CQI value down-regulation according to the multiple that needs to be down-regulated for the first TBS and the first TBS;
and the selecting unit is used for selecting a minimum value from the maximum value of the selected downward regulation of the CQI value and a preset maximum value of downward regulation allowed by the CQI value as a numerical value of the selected CQI value needing downward regulation after the downward regulation calculating unit determines the maximum value of the selected downward regulation.
20. The base station of claim 17, wherein the base station further comprises:
a set obtaining unit, configured to search a preset TBS table after the second determining unit determines the second TBS, and obtain a set of code channel numbers corresponding to the actual CQI value and the second TBS;
and a code channel selecting unit, configured to select a minimum code channel number from the set as an actual code channel number after the set of code channel numbers is acquired by the set acquiring unit.
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