CN112218318B - Subband shrinking method and device in LTE230 system - Google Patents

Subband shrinking method and device in LTE230 system Download PDF

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Publication number
CN112218318B
CN112218318B CN201910614264.9A CN201910614264A CN112218318B CN 112218318 B CN112218318 B CN 112218318B CN 201910614264 A CN201910614264 A CN 201910614264A CN 112218318 B CN112218318 B CN 112218318B
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mcs
subband
contraction
terminal
band
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CN112218318A (en
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胡健
姜春霞
袁菁
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Potevio Information Technology Co Ltd
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Potevio Information Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/04—Arrangements for maintaining operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic

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  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The embodiment of the invention provides a subband shrinking method and device in an LTE230 system, wherein the method comprises the following steps: if judging that the MCS level of the uplink modulation and coding strategy is lowered to a preset subband contraction index threshold MCS_th, calculating the accumulated times of the MCS_th according to the current uplink transmission quality information of the terminal; and carrying out subband contraction control on the terminal according to the accumulated times of the MCS_th. Vice versa, the recovery process of the shrink sub-band. According to the sub-band contraction method and device in the LTE230 system, the preset sub-band contraction triggering condition is dynamically adjusted according to the current uplink transmission quality information of the terminal, so that the speed of sub-band contraction is changed, the power spectrum density of the terminal is adaptively changed, the floating change of the uplink SINR of the terminal is ensured to be stable in a certain range, the demodulation requirement of signals is met, and the data transmission rate and accuracy are improved.

Description

Subband shrinking method and device in LTE230 system
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a subband shrinking method and device in an LTE230 system.
Background
The LTE230 system is a special 4G network communication system designed for the power communication network, and aims to meet the low-delay, wide-coverage, large-connection and high-reliability communication requirements of the power communication network, and provide a complete bearing platform for the reliable transmission of various services of the power communication network. The system can flexibly provide frequency band resources of single or multiple sub-bands for scheduling aiming at various service transmissions (such as fine control service, non-fine control service, paging service and the like) of the power communication network so as to meet QoS (quality of service) and resource requirements of different service transmissions. When the multi-sub-band system resource allocation is performed for the non-precision control service, the fact that the uplink signal to noise ratio (SINR) of the UE is obviously changed along with the movement of the UE and the change of channel quality under the premise of no closed loop power control effect in the moving process of a part of terminal UE continuously far away from a base station or from a distance close to the base station is considered, particularly when the channel transmission quality is reduced to a certain degree, the modulation coding Mode (MCS) is reduced to the lowest level, and the further deterioration of the SINR can cause serious deterioration of the throughput of the UE, if corresponding measures cannot be taken, the effective transmission of the uplink service can be influenced.
In the prior art, aiming at the current LTE230 system, along with the movement of the UE and the change of channel quality, the base station dynamically adjusts the modulation and coding strategy MCS level for the base station based on the adaptive modulation and coding AMC algorithm through downlink control information DCI. When the MCS level of the UE has been reduced to the lowest order, if the uplink signal SINR of the UE is further deteriorated, a certain measure needs to be taken to raise or stabilize the SINR to ensure correct demodulation of the uplink signal. Particularly, when the MCS level of the UE is reduced to the lowest level and reaches a certain preset times during the transmission of the non-precisely controlled service, the triggering condition of subband contraction is met, a subband contraction mechanism is started, and the subbands are gradually contracted to the minimum range according to a certain proportion. After the uplink frequency band resources allocated by the UE are contracted, the power spectrum density on each frequency band resource is improved, so that the receiving power of the uplink signal can be improved in this way, and further reduction of SINR is avoided. When the UE approaches the base station, and the uplink signal SINR is improved, and the low-order MCS is increased to a certain high-order MCS, the limit on the subband contraction is canceled, and the original frequency band resource can be restored again according to the initial subband number of the UE. The preset times when the MCS level is reduced to the lowest level and the recovery threshold value after the MCS is lifted are preset by a manager through a network management system, the preset times determine the speed of subband shrinkage and recovery, and the smaller the preset times or the recovery threshold, the faster the subband shrinkage or recovery, and the slower the subband shrinkage or recovery. The setting of the preset times and the specific value of the recovery threshold is completely configured by a manager according to experience.
However, in the existing method, the manager configures the speed of the subband shrinkage according to experience, if the subband shrinkage is too slow, the uplink signal SINR of the UE may be deteriorated to a condition that the transmission rate and accuracy of the signal cannot be guaranteed, and a certain time still needs to be waited, so that the uplink transmission rate and accuracy are reduced; if the subband is shrunk too fast, it may result in the situation that the uplink signal SINR at the UE can also meet the transmission rate and accuracy requirements of the signal, and if the subband is shrunk too early, the uplink transmission rate will be reduced as well.
Disclosure of Invention
An objective of the embodiments of the present invention is to provide a subband shrinking method and apparatus in an LTE230 system, which are used to solve the technical problem of low uplink transmission rate caused by that uplink SINR is raised or stabilized after channel transmission quality is seriously deteriorated, and subband shrinkage is avoided too fast or too slow.
In order to solve the above technical problems, in one aspect, an embodiment of the present invention provides a subband shrinking method in an LTE230 system, including:
if judging that the MCS level of the uplink modulation and coding strategy is lowered to a preset subband contraction index threshold MCS_th, calculating the accumulated times of the MCS_th according to the current uplink transmission quality information of the terminal;
and carrying out subband contraction control on the terminal according to the accumulated times of the MCS_th.
Further, the uplink transmission quality information is a ratio of the number of times of Acknowledgement (ACK) sent to the terminal in a preset feedback window to a window length of the preset feedback window.
Further, the calculation formula for calculating the accumulated number of mcs_th according to the current uplink transmission quality information of the terminal is as follows:
wherein N is mcs_th_count For the accumulated number of mcs_th, time_threshold is the initial accumulated number of mcs_th configured in advance, N is the Feedback number of uplink data, mcs_th_feedback_window is the Window length of the preset Feedback Window, and α is the ratio of the number of ACKs sent to the terminal in the preset Feedback Window to the Window length of the preset Feedback Window.
Further, the performing subband contraction control on the terminal according to the accumulated number of mcs_th specifically includes:
counting the scheduling times of which the uplink MCS level is equal to a preset subband contraction index threshold;
and if judging that the scheduling times of which the uplink MCS level is equal to the preset subband contraction index threshold reach the accumulated times of MCS_th, issuing subband contraction instruction information to the terminal.
Further, in the process of performing subband contraction control on the terminal according to the accumulated number of mcs_th, the method further includes:
and releasing the sub-band resources which are not occupied after the terminal performs sub-band shrinkage.
Further, in the process of performing subband contraction control on the terminal according to the accumulated number of mcs_th, the method further includes:
if the user type of the terminal is changed from the central user to the edge user, judging whether to adjust the frequency band resource of the terminal to the different frequency sub-band range according to the continuous idle frequency band number in the different frequency sub-band of the cell.
Further, after the subband shrink control is performed on the terminal according to the accumulated number of mcs_th, the method further includes:
and if the MCS level of the terminal is judged to be increased to the MCS index threshold for exiting the subband contraction, canceling the limitation of the subband contraction of the terminal, and adaptively adjusting the threshold according to the proportion of the current residual frequency band resources of the base station.
In another aspect, an embodiment of the present invention provides a network side device, including:
the adjusting module is used for calculating the accumulated times of the MCS_th according to the current uplink transmission quality information of the terminal if judging that the MCS level of the uplink modulation and coding strategy is lowered to the preset subband contraction index threshold MCS_th;
and the control module is used for carrying out subband contraction control on the terminal according to the accumulated times of the MCS_th.
In still another aspect, an embodiment of the present invention provides an electronic device, including: the computer program comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the steps of the method when executing the computer program.
In yet another aspect, embodiments of the present invention provide a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the above-described method.
According to the sub-band contraction method and device in the LTE230 system, the preset sub-band contraction triggering condition is dynamically adjusted according to the current uplink transmission quality information of the terminal, so that the speed of sub-band contraction is changed, the power spectrum density of the terminal is adaptively changed, the floating change of the uplink SINR of the terminal is ensured to be stable in a certain range, the demodulation requirement of signals is met, and the data transmission rate and accuracy are improved.
Drawings
Fig. 1 is a schematic diagram of a subband shrinking method in an LTE230 system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a network side device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the embodiment of the invention, aiming at the UE transmitting the non-precisely controlled service in the LTE230 system, when the uplink signal SINR is continuously reduced in the moving process to lead the MCS level to be reduced to the subband contraction index threshold of the MCS, for example, to be reduced to the lowest order (0 order) and reach a certain preset number of times, in order to ensure that the floating change of the uplink signal SINR is stable within a certain range, the network side equipment starts to contract and control the allocated multi-subband resources, and the triggering condition of contraction (and the triggering condition of the follow-up exiting subband contraction) can be dynamically adjusted according to the transmission quality of the terminal under the current channel environment, so that the contraction is quickened when the channel condition is poor, and the contraction requirement is slowed down when the channel condition is good until the minimum subband number is contracted.
Fig. 1 is a schematic diagram of a subband shrinking method in an LTE230 system according to an embodiment of the present invention, as shown in fig. 1, where an execution body of the subband shrinking method in the LTE230 system is a network side device, for example, a base station, and in the following embodiment, the base station is used as the network side device for convenience of understanding. The method comprises the following steps:
step S101, if judging that the MCS level of the uplink modulation and coding strategy is lowered to a preset subband contraction index threshold, adjusting a preset subband contraction triggering condition according to the current uplink transmission quality information of the terminal to obtain an adjusted subband contraction triggering condition.
Specifically, first, a subband contraction index threshold mcs_th and an initial accumulated number time time_threshold of mcs_th for a non-precision control service, an uplink data Feedback Window length mcs_th_feedback_window when mcs_th is used, a subband contraction ratio k and a minimum subband number N are configured for each serving base station through a network management center min_subband 。
Then, the base station adjusts the uplink MCS level of the terminal based on the AMC algorithm according to the SINR value of the uplink signal in the moving process of the UE, and the base station continuously reduces the uplink MCS level configured for the terminal along with the continuous reduction of the SINR value of the uplink signal.
When the uplink MCS level is reduced to a preset subband contraction index threshold MCS_th, triggering a subband contraction process aiming at the non-precisely controlled service for the terminal. At this time, the base station calculates the cumulative number of mcs_th according to the current uplink transmission quality information of the terminal.
The uplink transmission quality information is used for indicating the uplink channel transmission quality in the wireless environment where the terminal is currently located. For example, the uplink transmission quality information may be a ratio of the number of times of acknowledgement messages ACK sent by the base station to the terminal within the preset feedback window to a window length of the preset feedback window.
The initial accumulated time time_threshold of the MCS_th is configured by a manager through a network management center, and in the case that the manager does not update the initial accumulated time time_threshold of the MCS_th, the time_threshold is a fixed value, and the specific value of the time_threshold is configured by the manager according to experience.
And step S102, carrying out sub-band shrinkage control on the terminal according to the adjusted sub-band shrinkage triggering condition.
Specifically, after calculating the cumulative number of mcs_th, the base station continues AMC control on the terminal according to the uplink signal SINR of the terminal, configures an uplink MCS level for the terminal by issuing downlink control information DCI, counts the number of scheduling times for which the uplink MCS level configured for the terminal is equal to mcs_th, and calculates the cumulative number of times N for which the uplink MCS level is equal to mcs_th and mcs_th based on the number of scheduling times for which the uplink MCS level is equal to mcs_th mcs_th_count And judging whether the sub-band contraction triggering condition is satisfied.
When the triggering condition of the sub-band contraction is met, the base station instructs the terminal to carry out the sub-band contraction by sending sub-band contraction instruction information to the terminal. And when the triggering condition of the subband contraction is not met, the base station continues waiting.
The subband shrink triggering conditions are: the uplink MCS level is equal to the number N of times of the MCS_th scheduling to reach the number N of times of the MCS_th accumulation mcs_th_count . Calculating the accumulated times N of MCS_th according to the current uplink channel transmission quality of the terminal mcs_th_count Dynamically adjusting the speed of subband contraction is realized. The method and the device can adaptively change the power spectral density of the terminal, thereby ensuring that the floating change of the uplink SINR can be stabilized in a certain range, meeting the demodulation requirement of signals and improving the data transmission rate and accuracy.
According to the sub-band contraction method in the LTE230 system, the preset sub-band contraction triggering condition is dynamically adjusted according to the current uplink transmission quality information of the terminal, so that the speed of sub-band contraction is changed, the power spectrum density of the terminal is adaptively changed, the floating change of the uplink SINR of the terminal is ensured to be stable in a certain range, the demodulation requirement of signals is met, and the data transmission rate and accuracy are improved.
Based on any one of the above embodiments, further, the uplink transmission quality information is a ratio of the number of times of Acknowledgement (ACK) messages sent to the terminal in a preset feedback window to a window length of the preset feedback window.
Specifically, the uplink transmission quality information is used to represent the uplink channel transmission quality in the wireless environment in which the terminal is currently located.
In the embodiment of the invention, the uplink transmission quality information is the ratio of the number of times of Acknowledgement (ACK) messages sent to the terminal in a preset feedback window to the window length of the preset feedback window. By taking the feedback proportion of ACK as uplink transmission quality information, the current channel transmission quality of the terminal can be accurately reflected, so that the time for triggering the subband contraction can be more accurately determined.
The length of the Feedback Window in time is preset, and the length of the Feedback Window is measured by the Feedback times through the uplink data Feedback Window length MCS_th_feedback_Window configured by a manager through a network management center.
According to the sub-band contraction method in the LTE230 system, the preset sub-band contraction triggering condition is dynamically adjusted according to the current uplink transmission quality information of the terminal, so that the speed of sub-band contraction is changed, the power spectrum density of the terminal is adaptively changed, the floating change of the uplink SINR of the terminal is ensured to be stable in a certain range, the demodulation requirement of signals is met, and the data transmission rate and accuracy are improved.
Based on any one of the above embodiments, further, the calculation formula for calculating the accumulated number of mcs_th according to the current uplink transmission quality information of the terminal is as follows:
wherein N is mcs_th_count For the accumulated number of MCS_th, the time_threshold is the initial accumulated number of pre-configured MCS_th, N is the Feedback number of uplink data, MCS_th_feedback_Window is the Window length of the preset Feedback Window, and alpha is the Window length of the preset Feedback WindowThe ratio of the number of ACKs sent to the terminal in the feedback window to the window length of the preset feedback window.
Specifically, in the process of controlling the terminal to shrink the sub-bands, the time for triggering the sub-bands to shrink is important.
Before the sub-band is contracted and controlled, the initial accumulated times time threshold of the sub-band contraction index thresholds MCS_th and MCS_th for the non-precision control service are configured for each service base station through a network management center.
When the uplink MCS level is reduced to a preset subband contraction index threshold MCS_th, triggering a subband contraction process aiming at the non-precisely controlled service for the terminal.
In the process of carrying out contraction control on the sub-band, when the scheduling times of the uplink MCS level equal to the preset sub-band contraction index threshold reach the accumulated times of MCS_th, the base station can send out sub-band contraction instruction information to the terminal.
Therefore, the value of the number of times mcs_th is integrated determines the contraction rate of the subband, and the smaller the value of the number of times mcs_th is, the faster the subband is contracted, and the larger the value of the number of times mcs_th is, the slower the subband is contracted.
If the subband is too slow, the uplink signal SINR of the UE may be deteriorated to a condition that the transmission rate and accuracy of the signal cannot be guaranteed, and a certain time still needs to be waited, so that the uplink transmission rate and accuracy are reduced; if the subband is shrunk too fast, it may result in the situation that the uplink signal SINR at the UE can also meet the transmission rate and accuracy requirements of the signal, and if the subband is shrunk too early, the uplink transmission rate will be reduced as well.
According to the embodiment of the invention, on the basis of the initial accumulated time time_threshold of the MCS_th, the accumulated time of the MCS_th used by the terminal is adaptively adjusted by utilizing the current uplink transmission quality information of the terminal, so that the flexibility of a subband contraction function is enhanced, and the subband is not contracted too fast or too slow.
The calculation formula for calculating the accumulated number of MCS_th according to the current uplink transmission quality information of the terminal is as follows:
wherein N is mcs_th_count For the accumulated number of mcs_th, time_threshold is the initial accumulated number of mcs_th configured in advance, N is the Feedback number of uplink data, mcs_th_feedback_window is the Window length of the preset Feedback Window, and α is the ratio of the number of ACKs sent to the terminal in the preset Feedback Window to the Window length of the preset Feedback Window.
Calculating the accumulated times N of MCS_th according to the current uplink channel transmission quality of the terminal mcs_th_count Dynamically adjusting the speed of subband contraction is realized. The method and the device can adaptively change the power spectral density of the terminal, thereby ensuring that the floating change of the uplink SINR can be stabilized in a certain range, meeting the demodulation requirement of signals and improving the data transmission rate and accuracy.
When the current uplink transmission quality of the terminal is better, for example, when the current uplink transmission quality information of the terminal is greater than or equal to a preset threshold, the contraction speed of the sub-band is reduced based on the initial accumulated time_threshold of the MCS_th, namely, the calculated accumulated time N of the MCS_th mcs_th_count An initial accumulated number of times time threshold greater than mcs_th.
When the current uplink transmission quality of the terminal is poor, for example, when the current uplink transmission quality information of the terminal is smaller than a preset threshold value, the contraction speed of the sub-band is improved based on the initial accumulated time_threshold of the MCS_th, namely, the calculated accumulated time N of the MCS_th mcs_th_count Less than the initial accumulated number of times time threshold of MCS th.
According to the sub-band contraction method in the LTE230 system, the preset sub-band contraction triggering condition is dynamically adjusted according to the current uplink transmission quality information of the terminal, so that the speed of sub-band contraction is changed, the power spectrum density of the terminal is adaptively changed, the floating change of the uplink SINR of the terminal is ensured to be stable in a certain range, the demodulation requirement of signals is met, and the data transmission rate and accuracy are improved.
Based on any one of the above embodiments, further, the performing subband contraction control on the terminal according to the accumulated number of mcs_th specifically includes:
counting the scheduling times of which the uplink MCS level is equal to a preset subband contraction index threshold;
and if judging that the scheduling times of which the uplink MCS level is equal to the preset subband contraction index threshold reach the accumulated times of MCS_th, issuing subband contraction instruction information to the terminal.
Specifically, the base station obtains the cumulative number N of MCS_th mcs_th_count Then, AMC control is continuously performed on the terminal according to the uplink signal SINR of the terminal, an uplink MCS level is configured for the terminal by issuing DCI, and the scheduling times of the uplink MCS level equal to MCS_th are counted, and according to the scheduling times of the uplink MCS level equal to MCS_th and the accumulated times N of the MCS_th mcs_th_count And judging whether the sub-band contraction triggering condition is satisfied.
When the uplink MCS level is equal to the dispatching times of MCS_th and reaches the accumulated times N of MCS_th mcs_th_count And the triggering condition of the subband contraction is met, and at the moment, the base station instructs the terminal to perform subband contraction by sending subband contraction instruction information to the terminal.
When the uplink MCS level is equal to the number N of times of the MCS_th scheduling does not reach the number N of times of the MCS_th accumulation mcs_th_count The sub-band contraction triggering condition is not satisfied and the base station continues to wait.
According to the sub-band contraction method in the LTE230 system, the preset sub-band contraction triggering condition is dynamically adjusted according to the current uplink transmission quality information of the terminal, so that the speed of sub-band contraction is changed, the power spectrum density of the terminal is adaptively changed, the floating change of the uplink SINR of the terminal is ensured to be stable in a certain range, the demodulation requirement of signals is met, and the data transmission rate and accuracy are improved.
Based on any one of the above embodiments, further, the process of performing subband contraction control on the terminal according to the accumulated number of mcs_th further includes:
and releasing the sub-band resources which are not occupied after the terminal performs sub-band shrinkage.
Specifically, in the prior art, a flag save method is adopted for the unused frequency band resources after the UE is contracted, so that the frequency band resources of the UE are used when the UE is recovered later. Since the sub-bands stored by the tag are not released, other UEs may have sub-band requirements, but cannot use the sub-bands, which easily causes waste of limited frequency band resources and low utilization efficiency of the frequency band resources as a whole.
In order to solve the technical problem, in the process that the base station performs subband contraction control on the terminal according to the accumulated times of the MCS_th, the embodiment of the invention further comprises releasing the subband resources which are not occupied after the terminal performs subband contraction.
The released sub-band resources can be distributed to other terminals for use, so that the utilization rate of the frequency band resources is improved.
According to the sub-band contraction method in the LTE230 system, the preset sub-band contraction triggering condition is dynamically adjusted according to the current uplink transmission quality information of the terminal, so that the speed of sub-band contraction is changed, the power spectrum density of the terminal is adaptively changed, the floating change of the uplink SINR of the terminal is ensured to be stable in a certain range, the demodulation requirement of signals is met, and the data transmission rate and accuracy are improved. After the terminal performs subband contraction, if the user type is changed from a central user to an edge user under the judgment of an interference coordination algorithm and the different frequency subbands have band resources meeting the requirement of the terminal subband contraction, the terminal does not occupy non-different frequency subband resources any more and uses the band resources in the different frequency subbands.
Based on any one of the above embodiments, further, the process of performing subband contraction control on the terminal according to the accumulated number of mcs_th further includes:
if the user type of the terminal is changed from the central user to the edge user, judging whether to adjust the frequency band resource of the terminal to the different frequency sub-band range according to the continuous idle frequency band number in the different frequency sub-band of the cell.
Specifically, in order to avoid the interference problem, in the embodiment of the present invention, when the UE moves from the center of the cell to the edge of the cell in the process of performing subband contraction control on the terminal by the base station according to the accumulated number of mcs_th, the base station combines with the interference coordination algorithm, and determines whether to adjust the band resource of the terminal to the range of the different frequency subband according to the number of continuous idle bands in the different frequency subband of the cell.
In order to ensure the continuity of the UE related service, when the number of continuous idle frequency bands in the different frequency sub-band range of the base station is greater than or equal to the number of sub-bands after the UE is currently contracted, the base station timely adjusts the working frequency band of the UE to the different frequency sub-band range by issuing DCI, and simultaneously releases the frequency band resources which are not occupied after the UE performs sub-band contraction.
According to the sub-band contraction method in the LTE230 system, the preset sub-band contraction triggering condition is dynamically adjusted according to the current uplink transmission quality information of the terminal, so that the speed of sub-band contraction is changed, the power spectrum density of the terminal is adaptively changed, the floating change of the uplink SINR of the terminal is ensured to be stable in a certain range, the demodulation requirement of signals is met, and the data transmission rate and accuracy are improved. After the terminal performs subband contraction, if the user type is changed from a central user to an edge user under the judgment of an interference coordination algorithm and the different frequency subbands have band resources meeting the requirement of the terminal subband contraction, the terminal does not occupy non-different frequency subband resources any more and uses the band resources in the different frequency subbands.
Based on any one of the above embodiments, further, after the performing the subband shrink control on the terminal according to the accumulated number of mcs_th, the method further includes:
and if the MCS level of the terminal is judged to be increased to the MCS index threshold for exiting the subband contraction, canceling the limitation of the subband contraction of the terminal, and adaptively adjusting the threshold according to the proportion of the current residual frequency band resources of the base station.
Specifically, in the embodiment of the present invention, after the subband contraction control is performed on the terminal according to the accumulated number of mcs_th, the method further includes adaptively adjusting an MCS index threshold for the terminal to exit from subband contraction.
When the MCS level of the UE rises to a certain range, the base station cancels the sub-band resource allocation restriction of the non-fine control service, i.e. the original contracted band resource of the UE is recovered timely. By combining the proportion of the residual frequency band resources of the current base station, the MCS index threshold for exiting the subband contraction is adaptively adjusted, so that the base station can more flexibly select the limiting time for canceling the subband contraction.
According to the sub-band contraction method in the LTE230 system, the preset sub-band contraction triggering condition is dynamically adjusted according to the current uplink transmission quality information of the terminal, so that the speed of sub-band contraction is changed, the power spectrum density of the terminal is adaptively changed, the floating change of the uplink SINR of the terminal is ensured to be stable in a certain range, the demodulation requirement of signals is met, and the data transmission rate and accuracy are improved. After the terminal performs subband contraction, if the user type is changed from a central user to an edge user under the judgment of an interference coordination algorithm and the different frequency subbands have band resources meeting the requirement of the terminal subband contraction, the terminal does not occupy non-different frequency subband resources any more and uses the band resources in the different frequency subbands.
Based on any of the above embodiments, the following description will be given by way of a specific example:
step 1, configuring subband contraction index threshold MCS_th, initial accumulated time time_threshold of MCS_th threshold, uplink data Feedback Window length MCS_th_feed_Window, subband contraction ratio k and minimum subband number N of non-precision control service for each service base station through a network management center min_subband 。
And 2, the base station adjusts the MCS level of the uplink signal based on the AMC algorithm according to the SINR value of the uplink signal in the moving process of the UE, and triggers the subband contraction process of the non-precision control service when the MCS level is reduced to the subband contraction index threshold MCS_th. The flexibility of the subband contraction function is enhanced by adaptively adjusting the accumulated times of using the mcs_th order in combination with the transmission quality of the UE in the current channel environment.
At this time, the base station starts to calculate the accumulated number N of times the MCS_th order is used by the UE mcs_th_count The magnitude of this number determines whether to advance or retard the corresponding subband puncturing for the UE. Thus, the value of the cumulative number of times will be based on the configurationThe initial accumulated time_threshold of the mcs_th threshold of (b) is adjusted according to the ACK feedback condition of the UE uplink data transmission, namely as shown in the formula (1):
when the UE uses the mcs_th order modulation coding scheme, a corresponding uplink data Feedback Window mcs_th_feedback_window is established for the UE. When the feedback number N does not reach the window length, N mcs_th_count The value is time_threshold. When the feedback times reach the window length, the feedback window slides backward gradually, and the feedback results in the previous window are moved out one by one in a first-in first-out manner. Wherein α is the ACK Feedback ratio in the Window length mcs_th_feedback_window. If the ratio value is higher, the transmission effect is better when the MCS_th order is currently used, so that the accumulated number N is increased on the basis of the original time_threshold configuration mcs_th_count Thereby deferring the execution of the subband puncturing. The lower the ratio value is, the worse the transmission effect is when the MCS_th order is used currently, the accumulated times N is reduced on the basis of the original time_threshold configuration mcs_th_count The subband puncturing needs to be performed as soon as possible.
When the uplink MCS level is equal to the scheduling frequency of the preset subband contraction index threshold, the accumulated frequency N of MCS_th is reached mcs_th_count And the base station contracts the frequency band resources allocated by the non-precision control service of the UE, and calculates the contraction proportion k according to the configuration on the basis of the existing sub-band number, as shown in a formula (2):
wherein N is send_subband For the number of subbands to be allocated after shrinkage, N subband_pre For the number of subbands allocated before puncturing, k is the subband puncturing ratio. After adjustment, N is mcs_th_count Is cleared to allow recounting. If the triggering condition of the subband contraction is satisfied again and the accumulated number of MCS_th order reaches N mcs_th_count And (3) after the second time, continuously calculating the number of the contracted sub-bands according to the formula (2).
The accumulated times of the subband contraction indexes MCS_th and the MCS index threshold of the exiting subband contraction are dynamically and timely adjusted by combining the residual frequency band resource proportion of the current base station and the uplink ACK feedback condition within a certain feedback window length, so that the non-precisely controlled service subband contraction function of the UE can be flexibly adapted to the variation trend of the current system performance. The speed of subband contraction is regulated to adaptively change the power spectrum density of the terminal, thereby ensuring that the floating change of the uplink SINR can be stabilized in a certain range, meeting the demodulation requirement of signals and improving the data transmission rate and accuracy.
When the frequency band resources allocated to the non-precisely controlled service of the UE are contracted, if the user type of the UE is changed from a central user to an edge user under the judgment of the interference coordination algorithm module, the base station judges whether to adjust the frequency band resources of the UE to be within the different frequency sub-band range according to the continuous idle frequency band number in the different frequency sub-band of the cell. In order to ensure the continuity of the UE related service, when the number of continuous idle frequency bands in the different frequency sub-band range of the base station is greater than or equal to the number of sub-bands after the UE is currently contracted, the base station timely adjusts the working frequency band of the UE to the different frequency sub-band range by issuing DCI, and simultaneously releases the frequency band resources which are not occupied after the UE performs sub-band contraction.
And 3, when the MCS order of the UE is increased to a certain range, the base station cancels the sub-band resource allocation limit of the non-precisely controlled service, namely the original contracted frequency band resource of the UE can be timely recovered. By combining the proportion of the residual frequency band resources of the current base station, the MCS index threshold for exiting the subband contraction is adaptively adjusted, so that the base station can more flexibly select the limiting time for canceling the subband contraction.
Specifically, as the SINR of the UE uplink signal increases, the MCS level adopted by the UE will be continuously increased under the AMC algorithm. When the following condition is satisfied, as shown in formula (3):
MCS＝MCS_th+delta_MCS (3)
wherein, MCS is the index of the currently adopted MCS order, MCS_th is the subband contraction index threshold, delta_MCS is the MCS index threshold for exit subband puncturing. At this time, the base station will cancel the allocation restriction of the non-precisely controlled service sub-band resources of the UE, i.e. if the number of uplink sub-bands currently allocated to the UE is smaller than the number N of initial sub-bands UL_data_init When the UE is not occupied enough sub-band resources according to the service requirement, the possibility that the sub-band is contracted before appears is indicated, and the base station can decide whether to recover the UE according to the number of the continuous frequency band resources which are currently idle and the initial sub-band number of the UE. Here, the value of delta_mcs is calculated by the formula (4), the formula (4) is as follows:
wherein, beta is the proportion value of the residual frequency band resource of the current base station. By introducing this ratio, when the base station band resources remain sufficient, the MCS index needs to be raised by a smaller order to cancel the limitation of subband puncturing faster, and delta_mcs is at least 1. And when the base station frequency band resource is short, the MCS index needs to be lifted by more orders to release the limit of subband contraction, and delta_MCS is 6 at maximum.
When the frequency band resources allocated by the non-precise control service of the UE are recovered, if the user type of the UE is changed from an edge user to a center user under the judgment of the interference coordination algorithm module, the base station judges whether to adjust the frequency band resources of the UE to be within the range of the non-heterogeneous frequency sub-band according to the number of continuous idle frequency bands in the non-heterogeneous frequency sub-band of the cell. In order to ensure the continuity of the UE related service, when the number of continuous idle frequency bands in the non-different frequency sub-band range of the base station is greater than or equal to the initial sub-band number of the UE, the base station timely adjusts the working frequency band of the UE to the non-different frequency sub-band range by issuing DCI, and simultaneously releases the frequency band resources which are not occupied after the UE performs sub-band contraction. Thereby improving the utilization rate of the frequency band resources.
Based on any of the foregoing embodiments, fig. 2 is a schematic diagram of a network side device provided by an embodiment of the present invention, as shown in fig. 2, where the embodiment of the present invention provides a network side device, for example, a base station, etc., configured to execute the method described in any of the foregoing embodiments, and specifically includes an adjusting module 201 and a control module 202, where:
the adjustment module 201 is configured to calculate the accumulated number of mcs_th according to the current uplink transmission quality information of the terminal if it is determined that the uplink modulation and coding strategy MCS level is lowered to the preset subband contraction index threshold mcs_th; the control module 202 is configured to perform subband contraction control on the terminal according to the accumulated number of mcs_th.
Based on any one of the above embodiments, further, the uplink transmission quality information is a ratio of the number of times of Acknowledgement (ACK) messages sent to the terminal in a preset feedback window to a window length of the preset feedback window.
Based on any one of the above embodiments, further, the calculation formula for calculating the accumulated number of mcs_th according to the current uplink transmission quality information of the terminal is as follows:
wherein N is mcs_th_count For the accumulated number of mcs_th, time_threshold is the initial accumulated number of mcs_th configured in advance, N is the Feedback number of uplink data, mcs_th_feedback_window is the Window length of the preset Feedback Window, and α is the ratio of the number of ACKs sent to the terminal in the preset Feedback Window to the Window length of the preset Feedback Window.
Based on any of the foregoing embodiments, further, the control module is specifically configured to:
counting the scheduling times of which the uplink MCS level is equal to a preset subband contraction index threshold;
and if judging that the scheduling times of which the uplink MCS level is equal to the preset subband contraction index threshold reach the accumulated times of MCS_th, issuing subband contraction instruction information to the terminal.
Based on any of the foregoing embodiments, further including a releasing module, configured to release a subband resource that is no longer occupied after the terminal performs subband contraction.
Based on any of the foregoing embodiments, further including an interference coordination algorithm module, configured to determine whether to adjust the band resource of the terminal to be within the different frequency sub-band according to the number of continuous idle bands within the different frequency sub-band of the cell if it is determined that the user type of the terminal is changed from a central user to an edge user.
Based on any one of the above embodiments, further including a subband recovery module, configured to adaptively adjust, if it is determined that the MCS level of the terminal is known to rise to the preset threshold, an MCS index threshold for the terminal to exit subband contraction according to the proportion of the current remaining band resources.
An embodiment of the present invention provides a network side device, which is configured to execute the method described in any one of the foregoing embodiments, and specific steps of executing the method described in the foregoing embodiment by using the network side device provided by this embodiment are the same as those of the foregoing corresponding embodiment, and are not repeated herein.
The network side equipment provided by the embodiment of the invention dynamically adjusts the preset subband contraction triggering condition according to the current uplink transmission quality information of the terminal to change the subband contraction speed so as to adaptively change the power spectrum density of the terminal, thereby ensuring that the floating change of the uplink SINR can be stabilized in a certain range, meeting the demodulation requirement of signals and improving the data transmission rate and accuracy. After the terminal performs subband contraction, if the user type is changed from a central user to an edge user under the judgment of an interference coordination algorithm and the different frequency subbands have band resources meeting the requirement of the terminal subband contraction, the terminal does not occupy non-different frequency subband resources any more and uses the band resources in the different frequency subbands.
Fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, as shown in fig. 3, where the device includes: a processor 301, a memory 302, a bus 303, and a computer program stored on the memory and executable on the processor.
Wherein the processor 301 and the memory 302 perform communication with each other through the bus 303;
the processor 301 is configured to invoke and execute the computer program in the memory 302 to perform the steps of the method embodiments described above, including, for example:
if judging that the MCS level of the uplink modulation and coding strategy is lowered to a preset subband contraction index threshold MCS_th, calculating the accumulated times of the MCS_th according to the current uplink transmission quality information of the terminal;
and carrying out subband contraction control on the terminal according to the accumulated times of the MCS_th.
Further, the logic instructions in the memory described above may be implemented in the form of software functional units and stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform 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, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Embodiments of the present invention provide a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform the steps of the method embodiments described above, for example comprising:
if judging that the MCS level of the uplink modulation and coding strategy is lowered to a preset subband contraction index threshold MCS_th, calculating the accumulated times of the MCS_th according to the current uplink transmission quality information of the terminal;
and carrying out subband contraction control on the terminal according to the accumulated times of the MCS_th.
Embodiments of the present invention provide a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method embodiments described above, for example, including:
if judging that the MCS level of the uplink modulation and coding strategy is lowered to a preset subband contraction index threshold MCS_th, calculating the accumulated times of the MCS_th according to the current uplink transmission quality information of the terminal;
and carrying out subband contraction control on the terminal according to the accumulated times of the MCS_th.
The embodiments of the apparatus and devices described above are merely illustrative, wherein the elements described as separate elements may or may not be physically separate, and elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A method of subband puncturing in an LTE230 system, comprising:
if judging that the MCS level of the uplink modulation and coding strategy is lowered to a preset subband contraction index threshold MCS_th, calculating the accumulated times of the MCS_th according to the current uplink transmission quality information of the terminal, wherein the accumulated times of the MCS_th are used for determining the contraction speed of the subband;
and carrying out subband contraction control on the terminal according to the accumulated times of the MCS_th.
2. The subband puncturing method in LTE230 system according to claim 1, wherein the uplink transmission quality information is a ratio of a number of acknowledgement messages ACKs sent to the terminal within a preset feedback window to a window length of the preset feedback window.
3. The subband shrinking method in LTE230 system according to claim 2, wherein the calculation formula for calculating the accumulated number of mcs_th according to the current uplink transmission quality information of the terminal is as follows:
wherein N is mcs_th_count For the accumulated number of mcs_th, time_threshold is the initial accumulated number of mcs_th configured in advance, N is the Feedback number of uplink data, mcs_th_feedback_window is the Window length of the preset Feedback Window, and α is the ratio of the number of ACKs sent to the terminal in the preset Feedback Window to the Window length of the preset Feedback Window.
4. The method for subband contraction in the LTE230 system according to claim 1, wherein the performing subband contraction control on the terminal according to the accumulated number of mcs_th specifically includes:
counting the scheduling times of which the uplink MCS level is equal to a preset subband contraction index threshold;
and if judging that the scheduling times of which the uplink MCS level is equal to the preset subband contraction index threshold reach the accumulated times of MCS_th, issuing subband contraction instruction information to the terminal.
5. The method for subband contraction in the LTE230 system according to claim 1, wherein the process of performing subband contraction control on the terminal according to the accumulated number of mcs_th further comprises:
and releasing the sub-band resources which are not occupied after the terminal performs sub-band shrinkage.
6. The method for subband contraction in the LTE230 system according to claim 1, wherein the process of performing subband contraction control on the terminal according to the accumulated number of mcs_th further comprises:
if the user type of the terminal is changed from the central user to the edge user, judging whether to adjust the frequency band resource of the terminal to the different frequency sub-band range according to the continuous idle frequency band number in the different frequency sub-band of the cell.
7. The method for subband contraction in the LTE230 system according to claim 1, wherein after the subband contraction control is performed on the terminal according to the accumulated number of mcs_th, further comprising:
and if the MCS level of the terminal is judged to be increased to the MCS index threshold for exiting the subband contraction, canceling the limitation of the subband contraction of the terminal, and adaptively adjusting the threshold according to the proportion of the current residual frequency band resources of the base station.
8. A network side device, comprising:
the adjusting module is used for calculating the accumulated times of the MCS_th according to the current uplink transmission quality information of the terminal if judging that the MCS level of the uplink modulation and coding strategy is lowered to a preset subband contraction index threshold MCS_th, wherein the accumulated times of the MCS_th are used for determining the contraction speed of the subband;
and the control module is used for carrying out subband contraction control on the terminal according to the accumulated times of the MCS_th.
9. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor, when executing the computer program, performs the steps of the subband puncturing method in the LTE230 system of any one of claims 1 to 7.
10. A non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor, implements the steps of the subband puncturing method in the LTE230 system according to any of claims 1 to 7.
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