CN111277369A - Downlink scheduling strategy adjusting method, device and server - Google Patents
Downlink scheduling strategy adjusting method, device and server Download PDFInfo
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
- H04L1/0005—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes applied to payload information
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
- H04L1/0011—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding applied to payload information
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
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- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
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Abstract
The invention provides a method, a device and a server for adjusting a downlink scheduling strategy, which are used for sending downlink data to a terminal based on a current modulation and coding strategy after the current modulation and coding strategy is obtained; and after receiving a data receiving feedback message sent by the terminal, adjusting the current modulation and coding strategy according to the data receiving feedback message. The invention receives the feedback message based on the data returned by the terminal, adjusts the current modulation coding strategy, and improves the adjustment efficiency of the downlink scheduling strategy, thereby improving the downlink quality.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, and a server for adjusting a downlink scheduling policy.
Background
In the related art, the downlink quality in an LTE (Long Term Evolution) network is obtained by using a CQI (channel quality indication) reported by a terminal. After the terminal accesses the base station, the base station configures the CQI reported by the terminal to obtain the quality of the downlink channel, and thus selects an appropriate MCS (modulation and Coding Scheme) to schedule downlink data, so that when the error rate is within a reasonable range, the channel capacity is maximized. However, this method is not accurate enough, and the adjustment efficiency of the scheduling policy is low, which easily causes the terminal to drop.
Disclosure of Invention
In view of the above, the present invention provides a method, an apparatus and a server for adjusting a downlink scheduling policy, so as to improve the efficiency of adjusting the downlink scheduling policy, thereby improving the downlink quality.
In a first aspect, an embodiment of the present invention provides a method for adjusting a downlink scheduling policy, where the method is applied to a base station; the base station is in communication connection with the terminal; the method comprises the following steps: acquiring a current modulation and coding strategy; based on the current modulation and coding strategy, sending downlink data to the terminal; receiving a data receiving feedback message sent by a terminal; and adjusting the current modulation and coding strategy according to the data receiving feedback message.
With reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where the step of adjusting the current modulation and coding strategy according to the data reception feedback message includes: according to the data receiving feedback message, adjusting the index value corresponding to the current modulation and coding strategy; and taking the modulation and coding strategy corresponding to the adjusted index value as the current modulation and coding strategy.
With reference to the first possible implementation manner of the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, wherein the data reception feedback message includes a hybrid automatic repeat request; the hybrid automatic repeat request comprises an acknowledgement signal, an unreceived signal or a non-acknowledgement signal; the method further comprises the following steps: setting a confirmation time threshold value and a non-confirmation time threshold value according to a preset error rate; setting the current confirmation times and the current non-confirmation times, and initializing the current confirmation times and the current non-confirmation times to be zero; the step of adjusting the index value corresponding to the current modulation and coding strategy according to the data receiving feedback message comprises the following steps: when receiving the confirmation signal, increasing the index value corresponding to the current modulation and coding strategy according to the confirmation signal, the current confirmation times and the confirmation times threshold; when an unreceived signal is received, the index value corresponding to the current modulation and coding strategy is not changed; and when the unacknowledged signal is received, reducing the index value corresponding to the current modulation and coding strategy according to the unacknowledged signal, the current unacknowledged times and the unacknowledged time threshold.
With reference to the second possible implementation manner of the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, where the step of increasing the index value corresponding to the current modulation and coding strategy according to the acknowledgement signal, the current acknowledgement number, and the acknowledgement number threshold includes: adding one to the current confirmation times to obtain updated current confirmation times; judging whether the updated current confirmation times are equal to a confirmation time threshold value or not; if not, not changing the index value corresponding to the current modulation and coding strategy; if the current modulation and coding strategy is equal to the confirmation times threshold, judging whether the index value corresponding to the current modulation and coding strategy is equal to the preset index value upper limit; if the current modulation and coding strategy is equal to the preset index value upper limit, the index value corresponding to the current modulation and coding strategy is not changed; and if the current modulation and coding strategy is not equal to the preset upper limit of the index value, adding one to the index value corresponding to the current modulation and coding strategy, and setting the current confirmation times to be zero.
With reference to the second possible implementation manner of the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, where the step of reducing the index value corresponding to the current modulation and coding strategy according to the unacknowledged signal, the current unacknowledged number, and an unacknowledged number threshold includes: adding one to the current unconfirmed times to obtain updated current unconfirmed times; judging whether the updated current confirmation times are equal to the unconfirmed time threshold value or not; if not, not changing the index value corresponding to the current modulation and coding strategy; if the index value is equal to the unconfirmed time threshold value, judging whether the index value corresponding to the current modulation and coding strategy is equal to a preset index value lower limit; if the index value is equal to the preset lower limit of the index value, the index value corresponding to the current modulation and coding strategy is not changed; and if the current modulation and coding strategy is not equal to the preset lower limit of the index value, subtracting one from the index value corresponding to the current modulation and coding strategy, and setting the current unconfirmed times to be zero.
With reference to the third possible implementation manner of the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, where the method further includes: receiving a channel quality indication sent by a terminal; determining an initial modulation and coding strategy according to the channel quality indication; and determining the initial modulation and coding strategy as the current modulation and coding strategy.
With reference to the fifth possible implementation manner of the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect, where before determining whether an index value corresponding to a current modulation and coding strategy is equal to a preset index value upper limit, the method further includes: judging whether the difference between the index value corresponding to the current modulation and coding strategy and the index value corresponding to the initial modulation and coding strategy exceeds a preset difference range or not; and if the difference value exceeds the preset difference value range, the index value corresponding to the current modulation and coding strategy is not changed.
In a second aspect, an embodiment of the present invention further provides a device for adjusting a downlink scheduling policy, where the device is disposed in a base station; the base station is in communication connection with the terminal; the device includes: the strategy acquisition module is used for acquiring the current modulation and coding strategy; the data sending module is used for sending downlink data to the terminal based on the current modulation and coding strategy; the message receiving module is used for receiving a data receiving feedback message sent by the terminal; and the strategy adjusting module is used for adjusting the current modulation and coding strategy according to the data receiving feedback message.
In a third aspect, an embodiment of the present invention further provides a server, including a processor and a memory, where the memory stores machine executable instructions capable of being executed by the processor, and the processor executes the machine executable instructions to implement the foregoing method.
In a fourth aspect, embodiments of the present invention also provide a machine-readable storage medium storing machine-executable instructions that, when invoked and executed by a processor, cause the processor to implement the above-described method.
The embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides a method, a device and a server for adjusting a downlink scheduling strategy, which are used for sending downlink data to a terminal based on a current modulation and coding strategy after the current modulation and coding strategy is obtained; and after receiving a data receiving feedback message sent by the terminal, adjusting the current modulation and coding strategy according to the data receiving feedback message. In the method, the current modulation coding strategy is adjusted based on the data receiving feedback message returned by the terminal, so that the adjustment efficiency of the downlink scheduling strategy is improved, and the downlink quality is improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention as set forth above.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a downlink scheduling policy adjusting method according to an embodiment of the present invention;
fig. 2 is a flowchart of another downlink scheduling policy adjusting method according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating increasing MCS index values in another downlink scheduling policy adjustment method according to an embodiment of the present invention;
fig. 4 is a flowchart of reducing an MCS index value in another downlink scheduling policy adjustment method according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a process of adjusting modulation and borrow policy index values according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an apparatus for adjusting a downlink scheduling policy according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a server according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The downlink quality in LTE is obtained by the CQI reported by the terminal. The downlink refers to a physical channel from a base station to a terminal (also referred to as a mobile station); the terminal can be a mobile phone. After the mobile phone accesses the base station, the base station configures the CQI reported by the mobile phone to obtain the quality of the downlink channel, so as to select a proper MCS (Modulation and Coding Scheme, Modulation and Coding strategy) to schedule downlink data, so that when the error rate is within a reasonable range, the channel capacity is maximized. However, the CQI sometimes has low accuracy, and if the CQI is completely dependent on the CQI, the adjustment efficiency of the scheduling policy is low, and even the terminal is dropped.
Based on this, the embodiment of the present invention provides a downlink scheduling policy adjusting method, which can be applied to data scheduling processes of various base stations.
For the convenience of understanding the present embodiment, a detailed description will be first given of a downlink scheduling policy adjusting method disclosed in the present embodiment.
The embodiment of the invention provides a downlink scheduling strategy adjusting method, which is applied to a base station; the base station is in communication connection with the terminal; as shown in fig. 1, the method includes:
step S100, a current modulation and coding strategy is obtained.
The modulation and coding strategy can be a common MCS in an LTE system; the MCS forms a rate table with the MCS index as a row and the columns of the table as the factors that affect the communication rate concerned. Therefore, each MCS index actually corresponds to a physical transmission rate under a set of parameters. When the modulation and coding strategy is initially determined, the modulation and coding strategy can be determined according to CQI reported by a terminal to a base station; the terminal generally reports the CQI to the base station at a certain frequency, and in order to avoid a large error in single CQI measurement, the CQI reported recently several times can be averaged to obtain an average CQI; and determining an initial modulation and coding strategy according to the corresponding relation between the preset CQI value and the MCS index value. The current modulation and coding strategy may be an initial modulation and coding strategy or a modulation and coding strategy adjusted by the method provided by the embodiment of the invention.
Step S102, based on the current modulation and coding strategy, sending downlink data to the terminal; specifically, after the current modulation and coding strategy is obtained, the downlink may be configured according to the parameters in the strategy, and the downlink data may be sent to the terminal through the configured downlink.
And step S104, receiving the data receiving feedback message sent by the terminal.
The data receiving feedback information is mainly generated according to downlink data received by the terminal; due to the quality of the downlink, the downlink data received by the terminal may be correct or incorrect, and the downlink data transmitted by the base station is not intended for the terminal and is not received by the terminal.
And step S106, adjusting the current modulation and coding strategy according to the data receiving feedback message.
When the modulation and coding strategy is adjusted, actually, the index value corresponding to the modulation and coding strategy needs to be adjusted; when the index value is determined, the corresponding modulation and coding strategy is also determined. If the data receiving feedback message indicates that the downlink data received by the terminal is correct, the index value corresponding to the modulation and coding strategy can be reduced properly according to the accumulation amount of correct times; if the data receiving feedback message indicates that the downlink data received by the terminal is wrong, the index value corresponding to the modulation and coding strategy can be increased properly according to the cumulative amount of the error times; if the data receiving feedback message indicates that the terminal does not receive the downlink data, the index value corresponding to the modulation and coding strategy is not changed, that is, the current modulation and coding strategy is not adjusted.
In the adjustment process, it is necessary to pay attention that the value range of the index value corresponding to the modulation and coding strategy cannot be exceeded, where the value range is related to the modulation mode adopted by the current base station, for example, when 256QAM (Quadrature amplitude modulation) is enabled, the value range corresponding to the index value corresponding to the modulation and coding strategy is 0-32; when 256QAM is not enabled, the value range corresponding to the index value corresponding to the modulation and coding strategy is 0-28. In addition, the range of adjusting the index value of the modulation and coding strategy according to the data reception feedback message may also be set to be not more than a certain range, such as not more than ± 8.
The embodiment of the invention provides a downlink scheduling strategy adjusting method, which comprises the steps of after a current modulation and coding strategy is obtained, sending downlink data to a terminal based on the current modulation and coding strategy; and after receiving a data receiving feedback message sent by the terminal, adjusting the current modulation and coding strategy according to the data receiving feedback message. In the method, the current modulation coding strategy is adjusted based on the data receiving feedback message returned by the terminal, so that the adjustment efficiency of the downlink scheduling strategy is improved, and the downlink quality is improved.
The embodiment of the invention also provides another downlink scheduling strategy adjusting method, which is realized on the basis of the embodiment; as shown in fig. 2, the method comprises the steps of:
step S200, receiving the channel quality indication sent by the terminal. In general, a base station broadcasts a non-directional signal at a certain frequency, and a terminal in communication connection with the base station can receive the signal and generate a channel quality indicator based on the signal to reflect the communication quality of a downlink between the terminal and the base station to a certain extent.
Step S202, according to the channel quality indication, an initial modulation and coding strategy is determined.
Since the value of CQI may change rapidly, in order to make the adjustment of MCS more stable, the value of CQI may be an average value of multiple CQI reported recently. If the CQI period is more than or equal to 20ms, the average value of the CQI for nearly 4 times is taken; if less than 20ms, the CQI is averaged over nearly 6 times. Each CQI corresponds to a modulation and coding strategy (while coding efficiency is also determined).
In addition, when the base station detects a change in rank indication (which may be expressed in RI), such as RI 1 — 2 (i.e., when the rank is changed from 1 to 2), the CQIs of codeword 0 and codeword 1 use the default CQIs configured by the data file; RI 2- - >1 (i.e. when the rank is changed from 2 to 2), the CQI of codeword 0 follows the CQI when RI is 2; a default CQI may be employed before the terminal fails to report the CQI, and the default CQI may be set to 6.
The CQI has a value range of [0,15], and when the CQI has values equal to 0 to 15, the index value DlCqiToMcs {2,3,4,5,7,9,11,13,15,17,19,20,21,23,24,25} (in the case where 265QAM is not enabled) or dlcqitomcext {0,3,5,8,11,13,15,17,19,21,23,25,27,29,30,31} (in the case where 265QAM is enabled) corresponding to the modulation and coding strategy is modulated.
The above process of determining the initial modulation and coding strategy is also referred to as adjusting MCS in an open-loop link adaptation manner (referred to as open-loop control).
Step S204, determining the initial modulation and coding strategy as the current modulation and coding strategy; when the data receiving feedback message sent by the terminal is not received, the scheduling of the downlink data can be performed by adopting an initial adjustment and coding strategy.
Step S206, obtain the current modulation and coding strategy.
And step S208, sending downlink data to the terminal based on the current modulation and coding strategy.
Step S210, receiving a data reception feedback message sent by the terminal.
The data reception feedback message may be a hybrid automatic repeat request (HARQ); the hybrid automatic repeat request comprises an acknowledgement signal, an unreceived signal or a non-acknowledgement signal; wherein, the acknowledgement signal can be represented by an Acknowledgement Character (ACK) to indicate that the transmitted data has been acknowledged and received without errors; the non-acknowledgement signal can indicate that the transmitted data has errors through a non-acknowledgement character (NACK); the above-mentioned non-received signal may be represented by DTX characters.
In the actual implementation process, the confirmation time threshold value and the non-confirmation time threshold value can be set according to the preset error rate; for example, when the target value of the error rate (block error rate, BLER) is 5%, setting the validation time threshold to be 300 times, and setting the non-validation time threshold to be 15 times; and setting two variables, namely the current confirmation times and the current non-confirmation times respectively, and initializing the current confirmation times and the current non-confirmation times to be zero.
Step S212, adjusting an index value corresponding to the current modulation and coding strategy according to the data reception feedback message.
Specifically, the step S212 may be implemented as follows:
(1) and when receiving the confirmation signal, increasing the index value corresponding to the current modulation and coding strategy according to the confirmation signal, the current confirmation times and the confirmation times threshold.
(2) When the non-received signal is received, the index value corresponding to the current modulation and coding strategy is not changed.
(3) And when the unacknowledged signal is received, reducing the index value corresponding to the current modulation and coding strategy according to the unacknowledged signal, the current unacknowledged times and the unacknowledged time threshold.
Step S214, using the modulation and coding strategy corresponding to the adjusted index value as the current modulation and coding strategy.
The above process of increasing the index value corresponding to the current modulation and coding strategy according to the acknowledgement signal, the current acknowledgement count and the acknowledgement count threshold, which is simply referred to as the process of increasing the MCS index value, is specifically implemented by the following manners, as shown in fig. 3:
and step S300, adding one to the current confirmation times to obtain the updated current confirmation times.
Step S302, judging whether the updated current confirmation times are equal to a confirmation time threshold value; if not, executing step S304; if the number of times of confirmation is equal to the threshold value, executing step S306; if the target value of the error rate (or block error rate, BLER) is 5%, the confirmation time threshold is set to 300 times, and the non-confirmation time threshold is set to 15 times, then it is determined whether the current confirmation time is equal to 15.
Step S304, the index value corresponding to the current modulation and coding strategy is not changed; if not, no adjustment is made.
Step S306, judging whether the difference between the index value corresponding to the current modulation and coding strategy and the index value corresponding to the initial modulation and coding strategy exceeds a preset difference range; if yes, go to step S304; if not, go to step S308; specifically, the preset difference range may be (-8,8), i.e., the index offset DeltaMcsOffset is within the range of [ -8,8], and when DeltaMcOffset is equal to-8 or 8, no adjustment is made to the index value.
Step S308, judging whether the index value corresponding to the current modulation and coding strategy is equal to the preset index value upper limit; if the index value is equal to the preset upper limit of the index value, executing step S304; if not, executing step S310.
When 256QAM is enabled, the value range corresponding to the index value corresponding to the modulation and coding strategy is 0 to 32; when 256QAM is not enabled, the value range corresponding to the index value corresponding to the modulation and coding strategy is 0-28, and the upper limit of the index value is 32 or 28; when the index value corresponding to the current modulation and coding strategy is equal to the upper limit of the index value, the index value is not adjusted any more.
Step S310, increment an index value corresponding to the current modulation and coding strategy by one, and set the current acknowledgement number to zero.
The above process of reducing the index value corresponding to the current modulation and coding strategy according to the unacknowledged signal, the current unacknowledged times and the unacknowledged times threshold, which is simply referred to as the process of reducing the MCS index value, is specifically implemented by the following manner, as shown in fig. 4:
and step S400, adding one to the current unconfirmed times to obtain updated current unconfirmed times.
Step S402, judging whether the updated current confirmation times are equal to the unconfirmed times threshold value; if not, executing step S404; if it is equal to the unconfirmed number threshold, step S406 is performed.
In step S404, the index value corresponding to the current modulation and coding strategy is not changed.
Step S406, judging whether the difference between the index value corresponding to the current modulation and coding strategy and the index value corresponding to the initial modulation and coding strategy exceeds a preset difference range; if yes, go to step S404; if not, step S408 is executed.
Step S408, judging whether the index value corresponding to the current modulation and coding strategy is equal to the preset lower limit of the index value; if the index value is equal to the preset lower limit of the index value, executing step S404; if not, go to step S410.
Step S410, subtracting one from the index value corresponding to the current modulation and coding strategy, and setting the current unacknowledged times to zero.
Specifically, the MCS index value adjusted by the above method may be expressed as MCS ═ DlCqiToMcs [ CQI ] + DeltaMcsOffset; taking the case that 256qam is not enabled as an example, DlCqiToMcs [ CQI ] is an index value corresponding to the initial modulation and coding strategy determined according to CQI, eltaMcsOffset is an index offset determined according to HARQ fed back by the terminal, and the process of obtaining the index offset may be referred to as adjusting MCS in a closed-loop link adaptation manner, which may be represented by fig. 5 (also referred to as closed-loop control).
Further, the index offset may be adjusted in the following manner: when the default BLER target value is 5%, adding 17 to a preset first variable every time the base station receives ACK feedback; when the base station receives NACK feedback each time, the preset second variable is reduced by 340, when the base station receives a DTX signal each time, the second variable is not increased or reduced, the two variables are independently counted, the accumulated value of the first variable reaches 5000(300 times ACK), the Delta McsOffset is increased by 1, and the first variable is cleared; the first variable accumulated value reaches-5000 (15 NACKs), DeltaMcsOffset is decreased by 1, and the second variable is cleared. When the rank indication changes, the DeltaMcsOffset is cleared.
Different services have different BLER target values, and the BLER target value of VOLTE (Voice over Long-term evolution Voice bearer) is higher than that of other services.
In the method, the current modulation coding strategy is adjusted based on the CQI returned by the terminal and the data receiving feedback message, so that the adjustment efficiency of the downlink scheduling strategy is improved, and the downlink quality is improved.
Corresponding to the above method embodiment, the embodiment of the present invention further provides a downlink scheduling policy adjusting apparatus, where the apparatus is disposed in a base station; the base station is in communication connection with the terminal; as shown in fig. 6, the apparatus includes:
a policy obtaining module 600, configured to obtain a current modulation and coding policy;
a data sending module 602, configured to send downlink data to a terminal based on a current modulation and coding strategy;
a message receiving module 604, configured to receive a data reception feedback message sent by a terminal;
a policy adjusting module 606, configured to adjust the current modulation and coding policy according to the data reception feedback message.
The embodiment of the invention provides a downlink scheduling strategy adjusting device, which is used for sending downlink data to a terminal based on a current modulation and coding strategy after the current modulation and coding strategy is obtained; and after receiving a data receiving feedback message sent by the terminal, adjusting the current modulation and coding strategy according to the data receiving feedback message. In the method, the current modulation coding strategy is adjusted based on the data receiving feedback message returned by the terminal, so that the adjustment efficiency of the downlink scheduling strategy is improved, and the downlink quality is improved.
Specifically, the policy adjustment module is further configured to: according to the data receiving feedback message, adjusting the index value corresponding to the current modulation and coding strategy; and taking the modulation and coding strategy corresponding to the adjusted index value as the current modulation and coding strategy.
Further, the data reception feedback message includes a hybrid automatic repeat request; the hybrid automatic repeat request comprises an acknowledgement signal, an unreceived signal or a non-acknowledgement signal; the above-mentioned device still includes: the threshold setting module is used for setting a confirmation time threshold and a non-confirmation time threshold according to a preset error rate; the initialization module is used for setting the current confirmation times and the current non-confirmation times and initializing the current confirmation times and the current non-confirmation times to be zero; the policy adjustment module is further configured to: when receiving the confirmation signal, increasing the index value corresponding to the current modulation and coding strategy according to the confirmation signal, the current confirmation times and the confirmation times threshold; when an unreceived signal is received, the index value corresponding to the current modulation and coding strategy is not changed; and when the unacknowledged signal is received, reducing the index value corresponding to the current modulation and coding strategy according to the unacknowledged signal, the current unacknowledged times and the unacknowledged time threshold.
Further, the policy adjustment module is further configured to: adding one to the current confirmation times to obtain updated current confirmation times; judging whether the updated current confirmation times are equal to a confirmation time threshold value or not; if not, not changing the index value corresponding to the current modulation and coding strategy; if the current modulation and coding strategy is equal to the confirmation times threshold, judging whether the index value corresponding to the current modulation and coding strategy is equal to the preset index value upper limit; if the current modulation and coding strategy is equal to the preset index value upper limit, the index value corresponding to the current modulation and coding strategy is not changed; and if the current modulation and coding strategy is not equal to the preset upper limit of the index value, adding one to the index value corresponding to the current modulation and coding strategy, and setting the current confirmation times to be zero.
Further, the policy adjustment module is further configured to: adding one to the current unconfirmed times to obtain updated current unconfirmed times; judging whether the updated current confirmation times are equal to the unconfirmed time threshold value or not; if not, not changing the index value corresponding to the current modulation and coding strategy; if the index value is equal to the unconfirmed time threshold value, judging whether the index value corresponding to the current modulation and coding strategy is equal to a preset index value lower limit; if the index value is equal to the preset lower limit of the index value, the index value corresponding to the current modulation and coding strategy is not changed; and if the current modulation and coding strategy is not equal to the preset lower limit of the index value, subtracting one from the index value corresponding to the current modulation and coding strategy, and setting the current unconfirmed times to be zero.
Further, the above apparatus further comprises: the indication receiving module is used for receiving the channel quality indication sent by the terminal; and the initial strategy determining module is used for determining an initial modulation and coding strategy according to the channel quality indication.
Further, the method further comprises: the difference value range judging module is used for judging whether the difference between the index value corresponding to the current modulation and coding strategy and the index value corresponding to the initial modulation and coding strategy exceeds a preset difference value range or not; and if the difference value exceeds the preset difference value range, the index value corresponding to the current modulation and coding strategy is not changed.
The downlink scheduling policy adjusting apparatus provided in the embodiment of the present invention has the same technical features as the downlink scheduling policy adjusting method provided in the above embodiment, so that the same technical problems can be solved, and the same technical effects can be achieved.
An embodiment of the present invention further provides a server, as shown in fig. 7, which includes a processor and a memory, where the memory stores machine executable instructions that can be executed by the processor, and the processor executes the machine executable instructions to implement the downlink scheduling policy adjustment.
Further, the server shown in fig. 7 further includes a bus 132 and a communication interface 133, and the processor 130, the communication interface 133 and the memory 131 are connected through the bus 132.
The memory 131 may include a high-speed Random Access Memory (RAM) and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory. The communication connection between the network element of the system and at least one other network element is realized through at least one communication interface 133 (which may be wired or wireless), and the internet, a wide area network, a local network, a metropolitan area network, and the like can be used. The bus 132 may be an ISA bus, PCI bus, EISA bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one double-headed arrow is shown in FIG. 7, but this does not indicate only one bus or one type of bus.
The processor 130 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 130. The processor 130 may be a general-purpose processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the device can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, or a discrete hardware component. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 131, and the processor 130 reads the information in the memory 131 and completes the steps of the method of the foregoing embodiment in combination with the hardware thereof.
An embodiment of the present invention further provides a machine-readable storage medium, where the machine-readable storage medium stores machine-executable instructions, and when the machine-executable instructions are called and executed by a processor, the machine-executable instructions cause the processor to implement the downlink scheduling policy adjustment.
The downlink scheduling policy adjustment and apparatus and the computer program product of the gateway server provided in the embodiments of the present invention include a computer-readable storage medium storing a program code, where instructions included in the program code may be used to execute the method described in the foregoing method embodiments, and specific implementation may refer to the method embodiments, and will not be described herein again.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A downlink scheduling strategy adjusting method is characterized in that the method is applied to a base station; the base station is in communication connection with a terminal; the method comprises the following steps:
acquiring a current modulation and coding strategy;
sending downlink data to the terminal based on the current modulation and coding strategy;
receiving a data receiving feedback message sent by the terminal;
and adjusting the current modulation and coding strategy according to the data receiving feedback message.
2. The method of claim 1, wherein the step of adjusting the current modulation and coding scheme according to the data reception feedback message comprises:
adjusting an index value corresponding to the current modulation and coding strategy according to the data receiving feedback message;
and taking the modulation and coding strategy corresponding to the adjusted index value as the current modulation and coding strategy.
3. The method of claim 2, wherein the data reception feedback message comprises a hybrid automatic repeat request; the hybrid automatic repeat request comprises an acknowledgement signal, an unreceived signal, or a non-acknowledgement signal;
the method further comprises the following steps:
setting a confirmation time threshold value and a non-confirmation time threshold value according to a preset error rate;
setting the current confirmation times and the current non-confirmation times, and initializing the current confirmation times and the current non-confirmation times to be zero;
the step of adjusting the index value corresponding to the current modulation and coding strategy according to the data reception feedback message comprises:
when the confirmation signal is received, increasing the index value corresponding to the current modulation and coding strategy according to the confirmation signal, the current confirmation times and the confirmation time threshold;
when the non-received signal is received, not changing the index value corresponding to the current modulation and coding strategy;
and when the unacknowledged signal is received, reducing the index value corresponding to the current modulation and coding strategy according to the unacknowledged signal, the current unacknowledged times and the unacknowledged time threshold value.
4. The method of claim 3, wherein the step of increasing the index value corresponding to the current modulation and coding scheme according to the acknowledgement signal, the current acknowledgement count and the acknowledgement count threshold comprises:
adding one to the current confirmation times to obtain updated current confirmation times;
judging whether the updated current confirmation times are equal to the confirmation time threshold value or not;
if not, not changing the index value corresponding to the current modulation and coding strategy;
if the current modulation and coding strategy is equal to the confirmation times threshold, judging whether the index value corresponding to the current modulation and coding strategy is equal to a preset index value upper limit;
if the current modulation and coding strategy is equal to the preset upper limit of the index value, the index value corresponding to the current modulation and coding strategy is not changed;
and if the current modulation and coding strategy is not equal to the preset upper limit of the index value, adding one to the index value corresponding to the current modulation and coding strategy, and setting the current confirmation times to be zero.
5. The method of claim 3, wherein the step of decreasing the index value corresponding to the current modulation and coding scheme according to the unacknowledged signal, the current unacknowledged number, and the unacknowledged number threshold comprises:
adding one to the current unconfirmed times to obtain updated current unconfirmed times;
judging whether the updated current confirmation times are equal to the unconfirmed times threshold value or not;
if not, not changing the index value corresponding to the current modulation and coding strategy;
if the current modulation and coding strategy is equal to the unconfirmed time threshold value, judging whether the index value corresponding to the current modulation and coding strategy is equal to a preset index value lower limit;
if the current modulation and coding strategy is equal to the preset lower limit of the index value, the index value corresponding to the current modulation and coding strategy is not changed;
and if the current modulation and coding strategy is not equal to the preset lower limit of the index value, subtracting one from the index value corresponding to the current modulation and coding strategy, and setting the current unconfirmed times to be zero.
6. The method of claim 4, further comprising:
receiving a channel quality indication sent by the terminal;
determining an initial modulation and coding strategy according to the channel quality indication;
and determining the initial modulation and coding strategy as a current modulation and coding strategy.
7. The method of claim 6, wherein before determining whether the index value corresponding to the current modulation and coding scheme is equal to a preset upper index value limit, the method further comprises:
judging whether the difference between the index value corresponding to the current modulation and coding strategy and the index value corresponding to the initial modulation and coding strategy exceeds a preset difference range or not;
and if the current modulation and coding strategy exceeds the preset difference range, the index value corresponding to the current modulation and coding strategy is not changed.
8. An apparatus for adjusting downlink scheduling policy, the apparatus being disposed in a base station; the base station is in communication connection with a terminal; the device comprises:
the strategy acquisition module is used for acquiring the current modulation and coding strategy;
a data sending module, configured to send downlink data to the terminal based on the current modulation and coding strategy;
the message receiving module is used for receiving a data receiving feedback message sent by the terminal;
and the strategy adjusting module is used for adjusting the current modulation and coding strategy according to the data receiving feedback message.
9. A server comprising a processor and a memory, the memory storing machine executable instructions executable by the processor, the processor executing the machine executable instructions to implement the method of any one of claims 1 to 7.
10. A machine-readable storage medium having stored thereon machine-executable instructions which, when invoked and executed by a processor, cause the processor to implement the method of any of claims 1 to 7.
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