CN112218318A - Subband contraction method and device in LTE230 system - Google Patents
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Abstract
The embodiment of the invention provides a subband contraction method and a 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 reduced to a preset sub-band contraction index threshold MCS _ th, calculating the accumulative times of the MCS _ th according to the current uplink transmission quality information of the terminal; and carrying out sub-band contraction control on the terminal according to the accumulated times of MCS _ th. Vice versa, the recovery process for the punctured sub-bands is also applicable. According to the subband contraction method and device in the LTE230 system, provided by the embodiment of the invention, the preset subband contraction triggering condition is dynamically adjusted according to the current uplink transmission quality information of the terminal, so that the subband contraction speed is changed, the power spectral density of the terminal is adaptively changed, the floating change of the uplink SINR can be stabilized in a certain range, the signal demodulation requirement is met, and the data transmission rate and accuracy are improved.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a subband contraction method and apparatus in an LTE230 system.
Background
The LTE230 system is a special 4G network communication system designed for a power communication network, and aims to meet the communication requirements of the power communication network on low delay, wide coverage, large connection and high reliability, and provide a complete bearing platform for reliable transmission of various services of the power communication network. The system can flexibly provide single sub-band or multi-sub-band frequency band resources for various service transmissions (such as precision control service, non-precision control service, paging service and the like) of the power communication network to carry out scheduling so as to meet the QoS (quality of service) and resource requirements of different service transmissions. When multi-subband system resource allocation is performed for non-fine control type services, considering that the uplink signal to noise ratio SINR of a part of terminal UEs can significantly change along with the movement of the UE and the change of channel quality under the premise of no closed-loop power control action in the motion process that the part of terminal UEs are continuously away from a base station or are close to the base station from a distance, especially when the channel transmission quality is reduced to a certain degree, the modulation and coding scheme MCS of the UE is reduced to the lowest order, and further deterioration of the SINR will cause severe deterioration of the throughput of the UE, and if corresponding measures cannot be taken, effective transmission of the uplink services will be affected.
In the prior art, for the current LTE230 system, along with the movement of the UE and the change of the channel quality, the base station dynamically adjusts the modulation and coding strategy MCS level for the UE through downlink control information DCI based on the adaptive modulation and coding AMC algorithm. When the MCS level of the UE has decreased to the lowest level, if the SINR of the uplink signal of the UE is further degraded, some measure needs to be taken to improve or stabilize the SINR to ensure correct demodulation of the uplink signal. Especially, when the MCS level of the UE is reduced to the lowest level and reaches a certain preset number of times when the UE transmits the non-precision control service, the subband contraction mechanism is started when the triggering condition of subband contraction is met, 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 shrunk, the power spectral density on each frequency band resource is increased, so that the received power of the uplink signal can be increased in this way, and further reduction of SINR is avoided. When the UE approaches the base station, the lower order MCS of the UE rises to a certain higher order MCS with the increase of the uplink signal SINR, so that the limitation of subband contraction is cancelled, and the original frequency band resource can be restored according to the initial number of subbands of the UE. The preset times that the MCS level is reduced to the lowest level and the recovery threshold value after the MCS is lifted are pre-configured by a manager through a network management system, the preset times determine the speed of the sub-band contraction and recovery, the smaller the preset times or the recovery threshold is, the faster the sub-band contraction or recovery is, and vice versa, the slower the sub-band contraction or recovery is. The setting of the preset times and the specific value of the recovery threshold is completely configured by management personnel according to experience.
However, in the existing method, the manager configures the subband contraction speed according to experience, if the subband contraction speed is too slow, the uplink signal SINR of the UE may deteriorate to a point that the transmission rate and accuracy of the signal cannot be guaranteed, and a certain time still needs to be waited, thereby reducing the uplink transmission rate and accuracy; if the sub-band is shrunk too fast, it may cause the uplink signal SINR at the UE to meet the transmission rate and accuracy requirement of the signal, and if the sub-band is shrunk too early, the uplink transmission rate may be reduced.
Disclosure of Invention
An object of the embodiments of the present invention is to provide a subband contraction method and apparatus in an LTE230 system, so as to solve the technical problem that an uplink SINR is increased or stabilized after channel transmission quality is seriously deteriorated, and avoid that an uplink transmission rate is low due to too fast or too slow subband contraction.
In order to solve the above technical problem, in one aspect, an embodiment of the present invention provides a subband puncturing method in an LTE230 system, including:
if judging that the MCS level of the uplink modulation and coding strategy is reduced to a preset sub-band contraction index threshold MCS _ th, calculating the accumulative times of the MCS _ th according to the current uplink transmission quality information of the terminal;
and carrying out sub-band contraction control on the terminal according to the accumulated times of MCS _ th.
Further, the uplink transmission quality information is a ratio of the number of times of sending an acknowledgement message ACK to the terminal in a preset feedback window to a window length of the preset feedback window.
Further, the formula for calculating the cumulative number of MCS _ th according to the current uplink transmission quality information of the terminal is as follows:
wherein N ismcs_th_countThe time _ threshold is an initial accumulated time of the MCS _ th configured in advance, N is a Feedback time of the uplink data, MCS _ th _ Feedback _ Window is a Window length of a preset Feedback Window, and α is a ratio of a 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 puncturing control on the terminal according to the accumulated MCS _ th number specifically includes:
counting the scheduling times of the uplink MCS level equal to the preset subband contraction index threshold;
and if the fact that the uplink MCS level is equal to the scheduling times of the preset sub-band contraction index threshold and reaches the accumulated times of MCS _ th is judged and obtained, sub-band contraction instruction information is sent to the terminal.
Further, in the process of performing subband puncturing control on the terminal according to the accumulated MCS _ th times, the method further includes:
and releasing the sub-band resources which are not occupied any more after the terminal performs sub-band contraction.
Further, in the process of performing subband puncturing control on the terminal according to the accumulated MCS _ th times, the method further includes:
and if the user type of the terminal is judged to be changed from the central user to the edge user, judging whether the frequency band resource of the terminal is adjusted to the range of the different frequency sub-band according to the number of continuous idle frequency bands in the different frequency sub-band of the cell.
Further, after performing subband puncturing control on the terminal according to the accumulated MCS _ th number, the method further includes:
and if the MCS level of the terminal is judged to be increased to the MCS index threshold of the withdrawal sub-band contraction, canceling the limitation of the terminal sub-band contraction, and adaptively adjusting the threshold according to the proportion of the current residual frequency band resource 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 reduced to a preset subband contraction index threshold MCS _ th;
and the control module is used for carrying out sub-band contraction control on the terminal according to the accumulated times of MCS _ th.
In another aspect, an embodiment of the present invention provides an electronic device, including: a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the above method when executing the computer program.
In yet another aspect, the present invention provides a non-transitory computer readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of the above method.
According to the subband contraction method and device in the LTE230 system, provided by the embodiment of the invention, the preset subband contraction triggering condition is dynamically adjusted according to the current uplink transmission quality information of the terminal, so that the subband contraction speed is changed, the power spectral density of the terminal is adaptively changed, the floating change of the uplink SINR can be stabilized in a certain range, the signal demodulation requirement is met, and the data transmission rate and accuracy are improved.
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Fig. 1 is a schematic diagram of a subband puncturing 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 clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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 of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
In the embodiment of the present invention, for a UE transmitting a non-fine control service in an LTE230 system, when an uplink signal SINR is continuously reduced in a moving process, which results in that an MCS level is reduced to a subband puncturing index threshold of an MCS, for example, to a lowest order (0 order), and reaches a certain preset number of times, in order to ensure that a floating change of the uplink signal SINR is stable within a certain range, a network side device starts to perform puncturing control on multiple subband resources allocated to the network side device, and a triggering condition for puncturing (and a triggering condition for subsequent subband puncturing quitting) are dynamically adjusted according to a transmission quality of a terminal in a current channel environment, so as to adapt to a requirement for accelerating puncturing when a channel condition is poor, and slowing down puncturing when the channel condition is good, until the number of the lowest subband is punctured.
Fig. 1 is a schematic diagram of a subband puncturing method in an LTE230 system according to an embodiment of the present invention, and as shown in fig. 1, an embodiment of the present invention provides a subband puncturing method in an LTE230 system, where an execution main body of the subband puncturing method is a network side device, for example, a base station, and for convenience of understanding, in the following embodiments, the base station is taken as the network side device for description. The method comprises the following steps:
step S101, if judging that the MCS level of the uplink modulation and coding strategy is reduced to a preset sub-band contraction index threshold, adjusting the preset sub-band contraction triggering condition according to the current uplink transmission quality information of the terminal to obtain the adjusted sub-band contraction triggering condition.
Specifically, firstly, a network management center configures a subband contraction index threshold MCS _ th for non-precision control service, an initial accumulation time _ threshold of MCS _ th, and an uplink data feedback window length M when MCS _ th is used for each service base stationCS _ th _ Feedback _ Window, sub-band contraction proportion k and minimum sub-band number Nmin_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.
And when the uplink MCS level is reduced to a preset sub-band contraction index threshold MCS _ th, triggering a sub-band contraction process of the terminal aiming at the non-precision control service. 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 to indicate 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 that the base station sends the acknowledgement message ACK to the terminal within a preset feedback window to a window length of the preset feedback window.
The initial cumulative time _ threshold of MCS _ th is configured by the administrator through the network management center, and in the case that the administrator does not update the initial cumulative time _ threshold of MCS _ th, the time _ threshold is a fixed value, and the specific value of the time _ threshold is configured by the administrator according to experience.
And step S102, carrying out sub-band contraction control on the terminal according to the adjusted sub-band contraction triggering condition.
Specifically, after calculating the number of times of accumulation of MCS _ th, the base station continues AMC control for 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 times of scheduling that the uplink MCS level configured for the terminal is equal to MCS _ th, and calculates the number of times of scheduling that the uplink MCS level is equal to MCS _ th and the number of times of accumulation N of MCS _ th according to the number of times of scheduling that the uplink MCS level is equal to MCS _ thmcs_th_countJudging whether the sub-band contraction triggering condition is met or not.
And when the sub-band contraction triggering condition is met, the base station instructs the terminal to perform sub-band contraction by sending sub-band contraction instruction information to the terminal. And when the sub-band contraction triggering condition is not met, the base station continues to wait.
The subband puncturing triggering conditions are as follows: the uplink MCS level is equal to the cumulative number N of times that the scheduling times of MCS _ th reaches MCS _ thmcs_th_count. Calculating the accumulative times N of MCS _ th according to the current uplink channel transmission quality of the terminalmcs_th_countAnd the dynamic adjustment of the contraction speed of the sub-band is realized. The power spectral density of the terminal is adaptively changed, so that the floating change of the uplink SINR can be stabilized in a certain range, the signal demodulation requirement is met, and the data transmission rate and accuracy are improved.
According to the subband contraction method in the LTE230 system, provided by the embodiment of the invention, the preset subband contraction triggering condition is dynamically adjusted according to the current uplink transmission quality information of the terminal, so that the subband contraction speed is changed, the power spectral density of the terminal is adaptively changed, the floating change of the uplink SINR can be ensured to be stable in a certain range, the signal demodulation requirement is met, and the data transmission rate and accuracy are improved.
Based on any of the above embodiments, further, the uplink transmission quality information is a ratio of the number of times of the acknowledgement message ACK 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 indicate the uplink channel transmission quality in the wireless environment in which the terminal is currently located.
In the embodiment of the present invention, the uplink transmission quality information is a ratio of the number of times of sending an acknowledgement message ACK to the terminal in a preset feedback window to a window length of the preset feedback window. By taking the feedback proportion of the ACK as the uplink transmission quality information, the current channel transmission quality of the terminal can be accurately reflected, and therefore the time for triggering subband contraction can be determined more accurately.
The length of the Feedback Window in time is preset, and the manager configures the uplink data Feedback Window length MCS _ th _ Feedback _ Window through the network management center, wherein the Window length of the Feedback Window is measured by the Feedback times.
According to the subband contraction method in the LTE230 system, provided by the embodiment of the invention, the preset subband contraction triggering condition is dynamically adjusted according to the current uplink transmission quality information of the terminal, so that the subband contraction speed is changed, the power spectral density of the terminal is adaptively changed, the floating change of the uplink SINR can be ensured to be stable in a certain range, the signal demodulation requirement is met, and the data transmission rate and accuracy are improved.
Based on any of the above embodiments, further, the formula for calculating the cumulative number of MCS _ th according to the current uplink transmission quality information of the terminal is as follows:
wherein N ismcs_th_countThe time _ threshold is an initial accumulated time of the MCS _ th configured in advance, N is a Feedback time of the uplink data, MCS _ th _ Feedback _ Window is a Window length of a preset Feedback Window, and α is a ratio of a number of ACKs sent to the terminal in the preset Feedback Window to the Window length of the preset Feedback Window.
Specifically, in the process of controlling the terminal to perform subband contraction, the timing for triggering subband contraction is important.
Before carrying out contraction control on the sub-band, configuring the initial accumulation times time _ threshold of the sub-band contraction index threshold MCS _ th and MCS _ th aiming at the non-precision control service for each service base station through a network management center.
And when the uplink MCS level is reduced to a preset sub-band contraction index threshold MCS _ th, triggering a sub-band contraction process of the terminal aiming at the non-precision control service.
In the process of controlling the subband contraction, when the scheduling times of the uplink MCS level equal to the preset subband contraction index threshold reaches the accumulated times of MCS _ th, the base station sends subband contraction instruction information to the terminal.
Therefore, the value of the MCS _ th accumulation number determines the subband contraction speed, and the smaller the value of the MCS _ th accumulation number, the faster the subband contraction, and the larger the value of the MCS _ th accumulation number, the slower the subband contraction.
If the subband is shrunk too slowly, the uplink signal SINR of the UE is possibly deteriorated to the condition that the transmission rate and the accuracy of the signal cannot be ensured, and a certain time still needs to be waited, so that the uplink transmission rate and the accuracy are reduced; if the sub-band is shrunk too fast, it may cause the uplink signal SINR at the UE to meet the transmission rate and accuracy requirement of the signal, and if the sub-band is shrunk too early, the uplink transmission rate may be reduced.
According to the embodiment of the invention, on the basis of the initial accumulation time _ threshold of the MCS _ th, the accumulation times of the MCS _ th used by the terminal are adaptively adjusted by using the current uplink transmission quality information of the terminal, so that the flexibility of the subband contraction function is enhanced, and the situation that the subband contraction is too fast or too slow is avoided.
The formula for calculating the cumulative number of MCS _ th according to the current uplink transmission quality information of the terminal is as follows:
wherein N ismcs_th_countThe time _ threshold is an initial accumulated time of the MCS _ th configured in advance, N is a Feedback time of the uplink data, MCS _ th _ Feedback _ Window is a Window length of a preset Feedback Window, and α is a ratio of a number of ACKs sent to the terminal in the preset Feedback Window to the Window length of the preset Feedback Window.
Calculating the accumulative times N of MCS _ th according to the current uplink channel transmission quality of the terminalmcs_th_countAnd the dynamic adjustment of the contraction speed of the sub-band is realized. The power spectral density of the terminal is adaptively changed, so that the floating change of the uplink SINR can be stabilized in a certain range, the signal demodulation requirement is met, and the data transmission rate and accuracy are improved.
When the current uplink transmission quality of the terminal is good, for example, when the current uplink transmission quality information of the terminal is greater than or equal to a preset threshold, the subband contraction speed is reduced on the basis of the initial accumulation times time _ threshold of the MCS _ th, that is, the calculated accumulation times N of the MCS _ thmcs_th_countGreater than the initial accumulation times time threshold of MCS _ th.
When the current uplink transmission quality of the terminal is poor, for example, the current uplink transmission quality information of the terminal is smaller than a preset threshold, on the basis of the initial cumulative time _ threshold of the MCS _ th, the subband contraction speed is increased, that is, the calculated cumulative time N of the MCS _ thmcs_th_countLess than the initial accumulation times time threshold of MCS _ th.
According to the subband contraction method in the LTE230 system, provided by the embodiment of the invention, the preset subband contraction triggering condition is dynamically adjusted according to the current uplink transmission quality information of the terminal, so that the subband contraction speed is changed, the power spectral density of the terminal is adaptively changed, the floating change of the uplink SINR can be ensured to be stable in a certain range, the signal demodulation requirement is met, and the data transmission rate and accuracy are improved.
Based on any of the above embodiments, further, the performing subband puncturing control on the terminal according to the accumulated MCS _ th number specifically includes:
counting the scheduling times of the uplink MCS level equal to the preset subband contraction index threshold;
and if the fact that the uplink MCS level is equal to the scheduling times of the preset sub-band contraction index threshold and reaches the accumulated times of MCS _ th is judged and obtained, sub-band contraction instruction information is sent to the terminal.
Specifically, the base station obtains the cumulative count N of MCS _ thmcs_th_countThen, according to the uplink signal SINR of the terminal, continuing AMC control to the terminal, configuring the uplink MCS level for the terminal by sending DCI, and counting the scheduling times of the uplink MCS level equal to MCS _ th, according to the scheduling times of the uplink MCS level equal to MCS _ th and the accumulative times N of MCS _ thmcs_th_countJudging whether the sub-band contraction triggering condition is met or not.
When the uplink MCS level is equal to the scheduling times of MCS _ th, the cumulative times N of MCS _ th is reachedmcs_th_countAnd when the subband contraction triggering condition is met, 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 MCS _ th scheduling frequency does not reach the accumulative frequency N of the MCS _ thmcs_th_countIf the subband contraction triggering condition is not met, the base station continues to wait.
According to the subband contraction method in the LTE230 system, provided by the embodiment of the invention, the preset subband contraction triggering condition is dynamically adjusted according to the current uplink transmission quality information of the terminal, so that the subband contraction speed is changed, the power spectral density of the terminal is adaptively changed, the floating change of the uplink SINR can be ensured to be stable in a certain range, the signal demodulation requirement is met, and the data transmission rate and accuracy are improved.
Based on any of the above embodiments, further, in the process of performing subband puncturing 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 any more after the terminal performs sub-band contraction.
Specifically, in the prior art, a flag is stored for a band resource that is not used after the UE puncturing, in order to be used when the band resource of the UE is restored later. Since the sub-band saved by the flag is not released, it may cause other UEs to have sub-band requirements but cannot use them, which easily causes waste of limited frequency band resources and inefficient utilization of 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 MCS _ th, the embodiment of the present invention further includes releasing subband resources that are no longer occupied after the terminal performs subband contraction.
The released sub-band resource can be allocated to other terminals for use, and the utilization rate of the frequency band resource is improved.
According to the subband contraction method in the LTE230 system, provided by the embodiment of the invention, the preset subband contraction triggering condition is dynamically adjusted according to the current uplink transmission quality information of the terminal, so that the subband contraction speed is changed, the power spectral density of the terminal is adaptively changed, the floating change of the uplink SINR can be ensured to be stable in a certain range, the signal demodulation requirement is met, and the data transmission rate and accuracy are improved. After the terminal contracts the sub-band, if the user type is changed from the central user to the edge user under the judgment of the interference coordination algorithm and the frequency band resource meeting the requirement of the terminal after the sub-band contraction exists in the different frequency sub-band, the terminal does not occupy the non-different frequency sub-band resource and uses the frequency band resource in the different frequency sub-band.
Based on any of the above embodiments, further, in the process of performing subband puncturing control on the terminal according to the accumulated number of MCS _ th, the method further includes:
and if the user type of the terminal is judged to be changed from the central user to the edge user, judging whether the frequency band resource of the terminal is adjusted to the range of the different frequency sub-band according to the number of continuous idle frequency bands in the different frequency sub-band of the cell.
Specifically, to avoid the interference problem, in the process that the base station performs subband contraction control on the terminal according to the accumulated number of MCS _ th, when the UE moves from the center of the cell to the edge of the cell, the base station may determine, by combining with the interference coordination algorithm, whether to adjust the frequency band resource of the terminal to the range of the different frequency subband according to the number of continuous idle frequency bands in the different frequency subband of the cell.
In order to ensure the continuity of the related service of the UE, when the number of continuous idle frequency bands in the pilot frequency sub-band range of the base station is more than or equal to the number of sub-bands after the current contraction of the UE, the base station adjusts the working frequency band of the UE into the pilot frequency sub-band range in time by sending DCI, and releases the frequency band resources which are not occupied any more after the sub-band contraction of the UE.
According to the subband contraction method in the LTE230 system, provided by the embodiment of the invention, the preset subband contraction triggering condition is dynamically adjusted according to the current uplink transmission quality information of the terminal, so that the subband contraction speed is changed, the power spectral density of the terminal is adaptively changed, the floating change of the uplink SINR can be ensured to be stable in a certain range, the signal demodulation requirement is met, and the data transmission rate and accuracy are improved. After the terminal contracts the sub-band, if the user type is changed from the central user to the edge user under the judgment of the interference coordination algorithm and the frequency band resource meeting the requirement of the terminal after the sub-band contraction exists in the different frequency sub-band, the terminal does not occupy the non-different frequency sub-band resource and uses the frequency band resource in the different frequency sub-band.
Based on any of the above embodiments, further, after performing subband puncturing 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 of the withdrawal sub-band contraction, canceling the limitation of the terminal sub-band contraction, and adaptively adjusting the threshold according to the proportion of the current residual frequency band resource of the base station.
Specifically, in the embodiment of the present invention, after performing subband puncturing control on the terminal according to the accumulated number of MCS _ th, adaptively adjusting an MCS index threshold at which the terminal exits subband puncturing.
When the MCS level of the UE increases to a certain range, the base station cancels the sub-band resource allocation restriction on the non-fine control service, that is, the originally 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 of the quitting sub-band contraction is self-adaptively adjusted, so that the base station can more flexibly select the limit time for canceling the sub-band contraction.
According to the subband contraction method in the LTE230 system, provided by the embodiment of the invention, the preset subband contraction triggering condition is dynamically adjusted according to the current uplink transmission quality information of the terminal, so that the subband contraction speed is changed, the power spectral density of the terminal is adaptively changed, the floating change of the uplink SINR can be ensured to be stable in a certain range, the signal demodulation requirement is met, and the data transmission rate and accuracy are improved. After the terminal contracts the sub-band, if the user type is changed from the central user to the edge user under the judgment of the interference coordination algorithm and the frequency band resource meeting the requirement of the terminal after the sub-band contraction exists in the different frequency sub-band, the terminal does not occupy the non-different frequency sub-band resource and uses the frequency band resource in the different frequency sub-band.
Based on any of the above embodiments, a specific example is described below:
step 1, configuring a sub-band contraction index threshold MCS _ th of non-precise control service, an initial accumulation time _ threshold of the MCS _ th threshold, an uplink data Feedback Window length MCS _ th _ Feedback _ Window when the MCS _ th is used, a sub-band contraction proportion k and a minimum sub-band number N for each service base station through a network management centermin_subband。
And 2, the base station adjusts the MCS level based on the AMC algorithm according to the SINR value of the uplink signal in the UE moving process, and triggers the sub-band contraction process of the non-precision control service when the MCS level is reduced to the sub-band contraction index threshold MCS _ th. By combining the transmission quality of the UE in the current channel environment, the accumulative times of using MCS _ th order are adaptively adjusted, and the flexibility of the sub-band contraction function is enhanced.
At this time, the base station starts to count the accumulated number of times N that the UE uses MCS _ th ordermcs_th_countThe size of the number determines whether to advance or retard the corresponding subband puncturing for the UE. Therefore, the value of the accumulation number is adjusted according to the ACK feedback condition of the UE uplink data transmission based on the initial accumulation number time _ threshold of the configured MCS _ th threshold, that is, as shown in 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 times N do not reach the window length, Nmcs_th_countThe value is time threshold. When the feedback times reach the window length, the feedback window gradually slides backwards, and the feedback results in the early entry window are shifted out one by one in a first-in first-out mode. Wherein α is the ACK Feedback ratio within the Window length MCS _ th _ Feedback _ Window. If the ratio value is higher, it indicates that the transmission effect is better when the MCS _ th order is currently used, so that the cumulative number N is increased on the basis of the original time _ threshold configurationmcs_th_countThereby deferring the performance of subband puncturing. The lower the ratio value is, the worse the transmission effect is when MCS _ th order is used currently, and the accumulated times are reduced on the basis of the original time _ threshold configurationNmcs_th_countSubband puncturing needs to be performed as soon as possible.
When the uplink MCS level is equal to the cumulative number N of times that the scheduling times of the preset sub-band contraction index threshold reach MCS _ thmcs_th_countThen, the base station shrinks the frequency band resource allocated to the non-precision control service of the UE, and calculates according to the configured shrinkage proportion k on the basis of the existing number of sub-bands, as shown in formula (2):
wherein N issend_subbandNumber of subbands to be allocated after puncturing, Nsubband_preK is the subband contraction ratio for the number of subbands assigned before contraction. After adjustment, N ismcs_th_countThe count of (2) is cleared to be counted again. If the sub-band contraction triggering condition is satisfied again and the accumulated MCS _ th order times reach Nmcs_th_countAnd (4) continuing to calculate the number of the sub-bands after contraction according to the formula (2).
By combining the ratio of the remaining frequency band resources of the current base station and the uplink ACK feedback condition within a certain feedback window length, the cumulative number of times of sub-band contraction index MCS _ th and the MCS index threshold for quitting sub-band contraction are dynamically and timely adjusted, so that the non-precision control service sub-band contraction function of the UE can flexibly adapt to the variation trend of the current system performance. The speed of subband contraction is adjusted to achieve the purpose of adaptively changing 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 band resources allocated to non-precision control services of the UE are shrunk, 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 band resources of the UE to the range of the different frequency sub-bands according to the number of continuous idle frequency bands in the different frequency sub-bands of the cell. In order to ensure the continuity of the related service of the UE, when the number of continuous idle frequency bands in the pilot frequency sub-band range of the base station is more than or equal to the number of sub-bands after the current contraction of the UE, the base station adjusts the working frequency band of the UE into the pilot frequency sub-band range in time by sending DCI, and releases the frequency band resources which are not occupied any more after the sub-band contraction of the UE.
And 3, when the MCS order of the UE is increased to a certain range, the base station cancels the sub-band resource allocation limitation of the non-precision control service, namely the originally 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 of the quitting sub-band contraction is self-adaptively adjusted, so that the base station can more flexibly select the limit time for canceling the sub-band contraction.
Specifically, as the SINR of the UE uplink signal increases, the MCS order adopted by the UE will continuously increase under the AMC algorithm. When the following conditions are satisfied, as shown in formula (3):
MCS＝MCS_th+delta_MCS (3)
wherein, MCS is the MCS order index currently adopted, MCS _ th is the subband contraction index threshold, and delta _ MCS is the MCS index threshold for quitting subband contraction. At this time, the base station cancels the distribution limitation of the UE non-precision control service sub-band resource, that is, if the number of the uplink sub-bands currently distributed by the UE is smaller than the number N of the initial sub-bandsUL_data_initWhen the UE is currently not occupying enough subband resources according to the service requirement, the base station determines whether to recover the UE according to the number of currently idle continuous frequency band resources and the number of initial subbands of the UE, where the probability that the subband is shrunk occurs before. Here, the value of delta _ MCS is calculated by equation (4), and equation (4) is as follows:
wherein, β is a ratio of the remaining frequency band resources of the current base station. By introducing the proportion, when the frequency band resource of the base station is sufficient, the MCS index can cancel the limitation of subband contraction quickly only by increasing fewer orders, and the delta _ MCS is minimum to 1. When the frequency band resource of the base station is in short supply, the MCS index needs to be increased by more orders to remove the limitation of subband contraction, and the delta _ MCS is maximum 6.
When the frequency band resource allocated to the non-precision control service of the UE is 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 will judge whether to adjust the frequency band resource of the UE to the range of the non-pilot frequency sub-band according to the number of continuous idle frequency bands in the non-pilot frequency sub-band of the cell. In order to ensure the continuity of the related service of the UE, when the number of continuous idle frequency bands in the non-pilot frequency sub-band range of the base station is greater than or equal to the initial number of sub-bands of the UE, the base station adjusts the working frequency band of the UE into the non-pilot frequency sub-band range in time by sending DCI, and releases the frequency band resources which are not occupied any more after the UE contracts the sub-bands. Thereby improving the utilization rate of the frequency band resource.
Based on any of the above embodiments, fig. 2 is a schematic diagram of a network side device according to an embodiment of the present invention, as shown in fig. 2, a network side device, for example, a base station, is provided in an embodiment of the present invention, and is configured to execute the method described in any of the above embodiments, and specifically includes an adjustment module 201 and a control module 202, where:
the adjusting module 201 is configured to calculate, if it is determined that the uplink modulation and coding strategy MCS level falls below the preset subband contraction index threshold MCS _ th, the cumulative number of times of MCS _ th according to the current uplink transmission quality information of the terminal; the control module 202 is configured to perform subband puncturing control on the terminal according to the accumulated MCS _ th times.
Based on any of the above embodiments, further, the uplink transmission quality information is a ratio of the number of times of the acknowledgement message ACK sent to the terminal in a preset feedback window to a window length of the preset feedback window.
Based on any of the above embodiments, further, the formula for calculating the cumulative number of MCS _ th according to the current uplink transmission quality information of the terminal is as follows:
wherein N ismcs_th_countIs the accumulated number of MCS _ th, time _ threshold is the initial accumulated number of MCS _ th configured in advance, N is the uplink numberAccording to the Feedback times, MCS _ th _ Feedback _ Window is the Window length of the preset Feedback Window, and α is the ratio of the number of times of ACK sent to the terminal in the preset Feedback Window to the Window length of the preset Feedback Window.
Based on any of the above embodiments, further, the control module is specifically configured to:
counting the scheduling times of the uplink MCS level equal to the preset subband contraction index threshold;
and if the fact that the uplink MCS level is equal to the scheduling times of the preset sub-band contraction index threshold and reaches the accumulated times of MCS _ th is judged and obtained, sub-band contraction instruction information is sent to the terminal.
Based on any of the above embodiments, further, the method further includes a releasing module, configured to release the sub-band resource that is no longer occupied after the terminal performs sub-band puncturing.
Based on any of the above embodiments, further, the method further includes an interference coordination algorithm module, configured to determine, if it is determined that the user type of the terminal is changed from a center user to an edge user, whether to adjust the frequency band resource of the terminal to a different frequency sub-band range according to the number of consecutive idle frequency bands in the different frequency sub-band of the cell.
Based on any of the above embodiments, further, the method further includes a sub-band recovering module, configured to adaptively adjust an MCS index threshold for the terminal to exit from sub-band contraction according to a ratio of current remaining frequency band resources if it is determined that the MCS level of the terminal rises to a preset threshold.
Embodiments of the present invention provide a network side device, configured to execute the method described in any one of the above embodiments, where specific steps of executing the method described in any one of the above embodiments by the network side device provided in this embodiment are the same as those in the corresponding embodiment described above, and are not described herein again.
The network side device 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 spectral density of the terminal, thereby ensuring that the floating change of the uplink SINR can be stabilized in a certain range, meeting the signal demodulation requirement and improving the data transmission rate and accuracy. After the terminal contracts the sub-band, if the user type is changed from the central user to the edge user under the judgment of the interference coordination algorithm and the frequency band resource meeting the requirement of the terminal after the sub-band contraction exists in the different frequency sub-band, the terminal does not occupy the non-different frequency sub-band resource and uses the frequency band resource in the different frequency sub-band.
Fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 3, the electronic device includes: a processor (processor)301, a memory (memory)302, a bus 303, and computer programs stored on the memory and executable on the processor.
Wherein, the processor 301 and the memory 302 complete the communication with each other through the bus 303;
the processor 301 is configured to call and execute the computer program in the memory 302 to perform the steps in the above method embodiments, including:
if judging that the MCS level of the uplink modulation and coding strategy is reduced to a preset sub-band contraction index threshold MCS _ th, calculating the accumulative times of the MCS _ th according to the current uplink transmission quality information of the terminal;
and carrying out sub-band contraction control on the terminal according to the accumulated times of MCS _ th.
In addition, the logic instructions in the memory may be implemented in the form of software functional units and may be stored in a computer readable storage medium when sold or used as a stand-alone product. 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.
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 above-described method embodiments, for example, including:
if judging that the MCS level of the uplink modulation and coding strategy is reduced to a preset sub-band contraction index threshold MCS _ th, calculating the accumulative times of the MCS _ th according to the current uplink transmission quality information of the terminal;
and carrying out sub-band contraction control on the terminal according to the accumulated times of MCS _ th.
An embodiment of the present invention provides a non-transitory computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the computer program implements the steps in the above method embodiments, for example, including:
if judging that the MCS level of the uplink modulation and coding strategy is reduced to a preset sub-band contraction index threshold MCS _ th, calculating the accumulative times of the MCS _ th according to the current uplink transmission quality information of the terminal;
and carrying out sub-band contraction control on the terminal according to the accumulated times of MCS _ th.
The above-described embodiments of the apparatuses and devices are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for subband puncturing in an LTE230 system, comprising:
if judging that the MCS level of the uplink modulation and coding strategy is reduced to a preset sub-band contraction index threshold MCS _ th, calculating the accumulative times of the MCS _ th according to the current uplink transmission quality information of the terminal;
and carrying out sub-band contraction control on the terminal according to the accumulated times of MCS _ th.
2. The method of claim 1, wherein the uplink transmission quality information is a ratio of a number of ACK messages sent to the terminal within a preset feedback window to a window length of the preset feedback window.
3. The method of claim 2, wherein the formula for calculating the cumulative number of MCS _ th according to the current uplink transmission quality information of the terminal is as follows:
wherein N ismcs_th_countThe time _ threshold is an initial accumulated time of the MCS _ th configured in advance, N is a Feedback time of the uplink data, MCS _ th _ Feedback _ Window is a Window length of a preset Feedback Window, and α is a ratio of a number of ACKs sent to the terminal in the preset Feedback Window to the Window length of the preset Feedback Window.
4. The method of claim 1, wherein the controlling subband puncturing for the terminal according to the accumulated MCS _ th number of times specifically comprises:
counting the scheduling times of the uplink MCS level equal to the preset subband contraction index threshold;
and if the fact that the uplink MCS level is equal to the scheduling times of the preset sub-band contraction index threshold and reaches the accumulated times of MCS _ th is judged and obtained, sub-band contraction instruction information is sent to the terminal.
5. The method of claim 1, wherein the sub-band puncturing control for the terminal according to the accumulated MCS _ th number further comprises:
and releasing the sub-band resources which are not occupied any more after the terminal performs sub-band contraction.
6. The method of claim 1, wherein the sub-band puncturing control for the terminal according to the accumulated MCS _ th number further comprises:
and if the user type of the terminal is judged to be changed from the central user to the edge user, judging whether the frequency band resource of the terminal is adjusted to the range of the different frequency sub-band according to the number of continuous idle frequency bands in the different frequency sub-band of the cell.
7. The method of claim 1, wherein after the subband puncturing according to the accumulated MCS _ th number of the terminal is controlled, the method further comprises:
and if the MCS level of the terminal is judged to be increased to the MCS index threshold of the withdrawal sub-band contraction, canceling the limitation of the terminal sub-band contraction, and adaptively adjusting the threshold according to the proportion of the current residual frequency band resource 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 reduced to a preset subband contraction index threshold MCS _ th;
and the control module is used for carrying out sub-band contraction control on the terminal according to the accumulated times of 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 according to any one of claims 1 to 7.
10. A non-transitory computer readable storage medium having stored thereon a computer program, which, when being executed by a processor, carries out the steps of the subband puncturing method in the LTE230 system according to any one of claims 1 to 7.
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