CN108243492B - Wireless cellular network power control method - Google Patents

Wireless cellular network power control method Download PDF

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CN108243492B
CN108243492B CN201611206454.XA CN201611206454A CN108243492B CN 108243492 B CN108243492 B CN 108243492B CN 201611206454 A CN201611206454 A CN 201611206454A CN 108243492 B CN108243492 B CN 108243492B
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deep fading
value
fading state
sir target
sir
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CN108243492A (en
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徐畅
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Leadcore Technology Co Ltd
Datang Semiconductor Design Co Ltd
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Leadcore Technology Co Ltd
Datang Semiconductor Design Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/362—Aspects of the step size

Abstract

The invention provides a power control method of a wireless cellular network, which provides two selection methods of SIR target values after entering a deep fading state, wherein a first incremental value is added on the average value of a plurality of the latest SIR target values, and the average value of the plurality of the latest SIR target values and the average value of the latest SIR target value before a terminal enters the deep fading state are taken; the time threshold value of the terminal entering the deep fading state is set, and the deep fading state timer is increased. When the channel environment suddenly becomes poor but not in a deep fading environment and the terminal enters a deep fading state, the SIR target value suitable for the current channel environment is quickly calculated, the terminal is helped to quickly jump out of the deep fading state, and the problem that the link is disconnected because the terminal cannot jump out after entering the deep fading state in the current scheme is solved.

Description

Wireless cellular network power control method
Technical Field
The invention relates to the technical field of mobile communication, in particular to a power control method of a wireless cellular network.
Background
The service provided by the wireless cellular network for each user needs to meet a certain quality of service (QoS), which is mainly determined by the signal-to-interference ratio (SIR) of the signal received by each user. Therefore, the allocation of radio resources by the wireless cellular network, and in particular the power allocation to each user link, is more important. For the WCDMA system, although users in the same cell are isolated from each other by orthogonal spreading codes, the multipath and delay of the wireless channel still cause the signals between users to interfere with each other due to the use of the same frequency band and time slot. The power control technology can effectively solve the problem, and can limit the transmitting power of the base station or the user as much as possible on the premise of ensuring the transmission quality requirement of the physical channel, thereby reducing the interference to other signals as much as possible, improving the system capacity and prolonging the standby time of the mobile phone.
From the uplink and downlink perspective, WCDMA divides uplink power control and downlink power control, where uplink power control mainly refers to control of the transmit power of the mobile station UE, and downlink power control mainly refers to control of the transmit power of a specific channel of the base station. Fig. 1 is a schematic diagram of downlink power control, and as shown in fig. 1, the downlink power control includes outer loop power control and inner loop power control. In order to ensure that a downlink signal received by a terminal meets the requirement of a block error rate (BLER) at a network side, outer loop power control generates an SIR target value for inner loop power control, the SIR target value is adjusted according to a Cyclic Redundancy Check (CRC) result of a downlink data block, the SIR target value is reduced when the CRC is correct, and the SIR target value is increased when the CRC is wrong. The inner loop power control generates a TPC command for adjusting the base station power by comparing the SIR estimated value of the downlink received signal with the SIR target value generated by the outer loop power control. When the SIR estimated value is less than or equal to the SIR target value, TPC sends an up-regulation command '1'; otherwise, the TPC sends a down command "0".
When the terminal is in a deep fading environment, the base station still cannot make the quality of the signal received by the terminal reach the expected value by transmitting at the maximum transmission power. Without the protection mechanism, the outer loop power control of the terminal will continuously increase the SIR target value, which is a deep fade (Wind up) condition. In this case, the SIR target value may increase to a maximum value, and when the link quality returns to normal, it takes a relatively long time for the terminal to decrease the SIR target value to the normal value because the SIR target value down-regulation step size is much smaller than the up-regulation step size. During this time, the base station transmit power is higher than actually needed, causing greater interference to other users. Therefore, the SIR target value after entering the deep fading state needs to be specially set, and cannot be directly adjusted according to the downlink CRC result.
As shown in fig. 2, the existing deep fading detection technology detects a deep fading state according to a downlink received data BLER statistic and an up-scaling ratio of a TPC command fed back to a base station, and has a problem of false detection of the deep fading state. In practical situations, when the channel environment is suddenly degraded, the BLER is suddenly increased, the TPC up-regulation ratio is also increased, and the terminal may enter a deep fading state, but the base station power does not reach the maximum value at this time, and an erroneous determination will cause the SIR target value meeting the BLER requirement before entering the deep fading state to be used as the SIR target valuewindupNeed to be lower than the channel environment after deteriorationThe required SIR target value and the base station power can not be increased, the downlink signal quality of a user can not be improved all the time, the user can not jump out in a deep fading state for a long time, and finally, a link is disconnected, so that the terminal performance is seriously influenced.
Further, the target SIR used during deep fading conditionswindupThe selection is not reasonable. According to the current algorithm, before entering a deep fading state, if the BLER is 0.7target≤BLER≤1.3BLERtargetUpdating and recording the average value of the SIR target value at the moment as the SIRwindupIt can be seen that the SIRwindupThe historical experience value is selected, but the downlink environment is deteriorated when the deep fading state is entered, and the once reasonable value is lower.
Therefore, a wireless cellular network power control method is needed to be designed, in which a channel environment suddenly becomes poor or in a deep fading environment, when a terminal enters a deep fading state, an SIR target value suitable for the current channel environment is quickly selected, and the terminal is helped to quickly jump out of the deep fading state, so as to solve the problem that a link is disconnected due to the fact that the terminal cannot jump out after entering the deep fading state.
Disclosure of Invention
The invention aims to provide a rapid exit algorithm for a depth fading state of a wrong entry so as to solve the problem that a link is disconnected due to the fact that a terminal cannot jump out after entering the depth fading state.
To solve the above technical problem, the method for controlling power of a wireless cellular network includes:
judging whether the terminal enters a deep fading state or not;
if the terminal enters a deep fading state, the SIR target value when the terminal enters the deep fading state is set to be the average value of a plurality of SIR target values plus a first incremental value.
Optionally, in the method for controlling power of a wireless cellular network, the first incremental value is 2dB to 4 dB.
Optionally, in the method for controlling power of a wireless cellular network, the average value of the plurality of SIR target values is an average value of a plurality of nearest SIR target values when a BLER value is within a range of 0.7 times the BLER target value and 1.3 times the BLER target value.
Optionally, in the wireless cellular network power control method, the wireless cellular network power control method further includes:
if the time that the terminal enters the deep fading state reaches the time threshold value and the terminal does not exit the deep fading state, the SIR target value that the terminal enters the deep fading state is adjusted up by a second incremental value, and the time that the terminal enters the deep fading state is cleared.
Optionally, in the method for controlling power of a wireless cellular network, the second incremental value is 1dB to 3 dB.
The invention also provides a wireless cellular network power control method, which comprises the following steps:
judging whether the terminal enters a deep fading state or not;
if the terminal enters a deep fading state, the initial value of the SIR target value of the terminal entering the deep fading state is set as the average value of a plurality of SIR target values and the average value of the SIR target value which is the nearest before the terminal enters the deep fading state.
Optionally, in the method for controlling power of a wireless cellular network, the average value of the plurality of SIR target values is an average value of a plurality of nearest SIR target values when a BLER value is within a range of 0.7 times the BLER target value and 1.3 times the BLER target value.
Optionally, in the wireless cellular network power control method, the wireless cellular network power control method further includes:
if the time that the terminal enters the deep fading state reaches the time threshold value and the terminal does not exit the deep fading state, the SIR target value that the terminal enters the deep fading state is adjusted up by a second incremental value, and the time that the terminal enters the deep fading state is cleared.
Optionally, in the method for controlling power of a wireless cellular network, the second incremental value is 1dB to 3 dB.
The invention also provides a wireless cellular network power control method, which comprises the following steps:
if the time that the terminal enters the deep fading state reaches the time threshold value and the terminal does not exit the deep fading state, the SIR target value that the terminal enters the deep fading state is adjusted up by a second incremental value, and the time that the terminal enters the deep fading state is cleared.
Optionally, in the method for controlling power of a wireless cellular network, the second incremental value is 1dB to 3 dB.
In the power control method of the wireless cellular network provided by the invention, two selection methods of SIR target values after entering a deep fading state are provided, a first incremental value is added on the average value of a plurality of recent SIR target values, or the average value of the plurality of recent SIR target values and the average value of the nearest SIR target value before the terminal enters the deep fading state are taken, so that the consideration of the influence of the deterioration of the downlink channel environment after entering the deep fading state is increased, the selection of the SIR target values used in the deep fading state is more reasonable, and a self-adaptive adjustment algorithm is adopted, so that the SIR target values are adjusted to meet the requirement of exiting the deep fading state as soon as possible, thereby improving the quality of downlink signals and helping the terminal to jump out of the deep fading state as soon as possible.
Furthermore, the invention increases a deep fading state timer by setting a time threshold value of the terminal entering the deep fading state, if the deep fading exit condition can not be met after the threshold time is reached, the SIR target value of the terminal entering the deep fading state is adjusted up by a second incremental value; and if the deep fading exit condition is met within the threshold time, directly exiting the deep fading state. When the channel environment is suddenly deteriorated but not in a deep fading environment and the terminal enters the deep fading state by mistake, the SIR target value suitable for the current channel environment is quickly calculated, so that the terminal is helped to jump out of the deep fading state quickly. The problem of the present scheme that the link can not be broken due to the fact that the link can not jump out after the depth fading state is mistakenly entered is solved.
Drawings
Fig. 1 is a schematic diagram of downlink power control;
fig. 2 is a schematic diagram of a prior art wireless cellular network power control method;
FIGS. 3-5 are flow charts of wireless cellular network power control methods according to embodiments of the present invention.
Detailed Description
The power control method of the wireless cellular network proposed by the present invention is further described in detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
The core idea of the invention is to provide a method for solving the problem that a terminal cannot jump out after entering a deep fading state, so that a link is disconnected.
To achieve the above idea, the present invention provides a power control method for a wireless cellular network, which comprises adding a first incremental value to the average of the latest SIR target values, or averaging the average of the latest SIR target values and the latest SIR target value before the terminal enters the deep fading state.
< example one >
Fig. 3 is a flowchart of a wireless cellular network power control method according to an embodiment of the present invention, and as shown in fig. 3, the embodiment provides a wireless cellular network power control method, where the wireless cellular network power control method includes: judging whether the terminal enters a deep fading state or not; if the terminal enters a deep fading state, the SIR target value when the terminal enters the deep fading state is set as the average value of a plurality of SIR target values plus a first increment value, and the first increment value is 2dB to 4dB, and is preferably 3 dB. The average value of the plurality of SIR target values is the average value of the plurality of nearest SIR target values when the BLER value is within the range of 0.7 times of the BLER target value and 1.3 times of the BLER target value. If 0.7BLERtarget≤BLER≤1.3BLERtargetThen calculating the average SIR of the most recent SIR target valuesavgThen SIRavgI.e. the average of said plurality of SIR target values.
Further, after entering the deep fading state, the deep fading state Flag is setwindup1, after exiting the deep fading state, the Flag of the deep fading state windup0, deep fading state FlagwindupThe initial value is 0, and the initial value of the SIR target value is SIRinitThat is, it is set not to enter deep fading state, if the CRC result is correct, the SIR target value is decreased by deltadwIf the CRC result is incorrect, the SIR target value is increased by deltaup。
The system comprises a BLER statistical window, the number of CRC results in the window is kept unchanged, when CRC check is carried out once and the BLER statistical window is entered, the oldest CRC result in the BLER statistical window is extruded out, a new BLER value is generated, and if the BLER value is reduced, the number C of times that the BLER is continuously reduced is reduceddwStarting counting, if successive BLER value reductions occur, CdwCan continue counting, otherwise, CdwAnd (6) clearing. The system updates a BLER statistical window in real time and counts BLER values and the number C of continuous reduction of BLER according to CRC (cyclic redundancy check) check results in the windowdw。
The system also includes a TPC statistical window, the number of TPC commands in the window is kept unchanged, when the SIR estimated value is less than or equal to the SIR target value, the TPC sends an up-regulation command; when SIR estimated value is larger than SIR target value, TPC sends down command, TPC enters a new command in TPC statistical window every time when sending command, extrudes an oldest command, system updates TPC command in TPC statistical window in real time by judging whether SIR estimated value reaches SIR target value or not, and counts up times N of TPC command in window in real timeupAnd number of times of TPC command Down Regulation Ndw。
Furthermore, when the system does not enter the deep fading state, the system judges if the BLER value is larger than or equal to the threshold InThBLERAnd N isupGreater than or equal to threshold InThTPCEntering a deep fading state, judging by the system after entering the deep fading state, and if C is the casedwGreater than or equal to threshold OutThBLERAnd N isdwGreater than or equal to threshold OutThTPCThe deep fade state is exited. In thatBefore the deep fading state is not exited, whether the SIR estimated value reaches the SIR target value is judged through CRC checksum, a TPC statistical window is updated, and the number N of TPC command down-regulation in the window is counteddwUpdating CRC check result in BLER statistical window and calculating BLER continuous reduction times CdwAnd finally, judging CdwWhether greater than or equal to threshold OutThBLERAnd NdwWhether greater than or equal to threshold OutThTPC。
When the terminal is in the deep fading state, if the time for the terminal to enter the deep fading state reaches the time threshold value and the terminal does not exit the deep fading state, the SIR target value for the terminal to enter the deep fading state is adjusted up by a second incremental value, and the time for the terminal to enter the deep fading state is cleared. The second increment value is 1dB to 3 dB. The time timer T for entering the deep fading state is judged every time whether the terminal exits the deep fading statewindupTime timer T for increasing 1 and judging entering deep fading statewindupWith a time threshold value TmaxIf T iswindup≥TmaxAnd the deep fading state exit condition cannot be satisfied, the SIR target value SIRwindupBy a second incremental value Delta, TwindupClearing; if T iswindup＜TmaxAnd if the deep fading state exit condition is met, directly exiting the deep fading state.
< example two >
Fig. 4 is a flowchart of a wireless cellular network power control method according to an embodiment of the present invention, and as shown in fig. 4, different from the previous embodiment, the wireless cellular network power control method according to the present embodiment includes: judging whether the terminal enters a deep fading state or not; if the terminal enters a deep fading state, the initial value of the SIR target value of the terminal entering the deep fading state is set as the average value of a plurality of SIR target values and the average value of the SIR target value which is the nearest SIR target value before the terminal enters the deep fading state, namely the SIR target valuewindup＝(SIRagv+SIRtgt) /2, the SIRtgtIs the SIR target value that is closest before entering the deep fading condition. If it isThe average value of the dry SIR target values is the average value of a plurality of nearest SIR target values, namely 0.7BLER when the BLER value is within the range of 0.7 times of the BLER target value and 1.3 times of the BLER target valuetarget≤BLER≤1.3BLERtargetCalculating the average SIR of the latest SIR target valuesavgThen SIRavgI.e. the average of said plurality of SIR target values.
The wireless cellular network power control method further comprises: if the time that the terminal enters the deep fading state reaches the time threshold value and the terminal does not exit the deep fading state, the SIR target value that the terminal enters the deep fading state is adjusted up by a second incremental value, and the time that the terminal enters the deep fading state is cleared, wherein the second incremental value is 1 dB-3 dB. The time timer T for entering the deep fading state is judged every time whether the terminal exits the deep fading statewindupTime timer T for increasing 1 and judging entering deep fading statewindupWith a time threshold value TmaxIf T iswindup≥TmaxAnd the deep fading state exit condition cannot be satisfied, the SIR target value SIRwindupBy a second incremental value Delta, TwindupClearing; if T iswindup＜TmaxAnd if the deep fading state exit condition is met, directly exiting the deep fading state.
Other parts of the algorithm of the present embodiment are the same as those of the previous embodiment, and the description of the present embodiment is not repeated. The technical scheme of combining the two is the protection scope of the invention.
< example three >
The method for controlling the power of the wireless cellular network provided by the embodiment comprises the following steps: if the time that the terminal enters the deep fading state reaches the time threshold value and the terminal does not exit the deep fading state, the SIR target value that the terminal enters the deep fading state is adjusted up by a second incremental value, and the time that the terminal enters the deep fading state is cleared, wherein the second incremental value is 1 dB-3 dB. The time timer T for entering the deep fading state is judged every time whether the terminal exits the deep fading statewindupIncrease 1, andtime timer T for judging entering deep fading statewindupWith a time threshold value TmaxIf T iswindup≥TmaxAnd the deep fading state exit condition cannot be satisfied, the SIR target value SIRwindupBy a second incremental value Delta, TwindupClearing; if T iswindup＜TmaxAnd if the deep fading state exit condition is met, directly exiting the deep fading state.
< example four >
Fig. 5 is a flowchart of a method for controlling power of a wireless cellular network according to an embodiment of the present invention, as shown in fig. 5, the technical solution of this embodiment is as follows:
step 1: deep fading state FlagwindupSet to 0, i.e. currently in a non-deep fade state.
Step 2: adjusting the SIR target value based on the CRC result, and if the CRC is correct, decreasing the SIR target value by deltadwOtherwise, the SIR target value is increased by Deltaup(initial value is SIR)init)。
And step 3: updating a TPC statistical window, wherein a plurality of TPC control words (up and down commands are filled alternately for the first time) generated recently are in the window, and counting the number N of the TPC command up-regulation in the windowup(ii) a And updating a CRC check result in a BLER statistical window, and calculating BLER.
The outer loop power control mainly generates an SIR target value required by the inner loop power control, the SIR target value is adjusted according to the CRC check result, and if the CRC is correct, the SIR target value is reduced by deltadwCRC error in SIR target value up by deltaup. Meanwhile, when one CRC result is obtained, a plurality of latest check results are counted, and a BLER statistical value is output. The inner loop power control generates TPC commands that adjust the base station power by comparing the SIR estimate with the SIR target value. When the SIR estimated value is less than or equal to the SIR target value, TPC sends an up-regulation command '1'; otherwise, the TPC sends a down command "0". Every time a TPC control word is generated, counting the latest WTPCOutputting TPC up-regulation times N according to the TPC resultupAnd the number of Down-Regulation times Ndw。
And 4, step 4: if 0.7BLERtarget≤BLER≤1.3BLERtargetThen calculating the average SIR of the latest SIR target valuesavg(initial value of first fill SIRinit) (ii) a Otherwise, directly carrying out the step 5.
And 5: if BLER is greater than or equal to threshold InThBLERAnd N isupGreater than or equal to threshold InThTPCIf yes, the state is transferred to a deep fading state, and the step 6 is entered; otherwise, returning to the step 1. The detection of the deep fading state is used as a supplement to the downlink power control, and the detection and the jump-out are carried out according to the up-regulation and down-regulation proportion of the BLER and the returned downlink TPC command, and the specific rule is as follows: BLER value is greater than or equal to decision threshold InThBLERAnd TPC number of up-adjustments NupGreater than or equal to threshold InThTPCThen, entering a deep fading state; number of successive reductions C of BLERdwGreater than or equal to a decision threshold OutThBLERAnd the TPC down-regulation times NdwGreater than or equal to threshold OutThTPCAnd then jump out of the deep fading state. When the terminal is in a deep fading state, the SIR target value is based on the average SIR before entering the deep fading stateavgAnd calculating, and adjusting according to the CRC result until a deep fading state is reached.
Step 6: deep fading state timer TwindupZero clearing and initial SIR target value in a deep fading state are set by one of the following two methods: (1) is set as SIRwindup＝SIRagv+ΔcompIn which ΔcompTaking the experience value as a constant compensation value, and taking 3 dB; (2) is set as SIRwindup＝(SIRagv+SIRtgt) /2, where SIRtgtThe nearest SIR target value before entering the deep fade state.
And 7: deep fading state FlagwindupSet to 1, i.e. the deep fading state is present.
And 8: timer TwindupAnd increasing by 1.
And step 9: if T iswindupTo a maximum value TmaxThen SIRwindupIncreasing Delta, TwindupAnd (5) clearing, otherwise, directly entering the step 10.
Step 10: the TPC statistical window is updated and,and counting the number N of TPC command down-regulation in the windowdw(ii) a Updating CRC check result in BLER statistical window, and calculating number C of BLER continuous reductiondw。
Step 11: if C is presentdwGreater than or equal to threshold OutThBLERAnd N isdwGreater than or equal to threshold OutThTPCIf yes, the state is transferred to a non-deep fading state, and the step 1 is returned; otherwise, the deep fading state is maintained, and the step 7 is returned.
In the algorithm for rapidly exiting from the deep fading state due to the mistaking, the SIR target value is selected on the historical average SIR by providing two selection methods after entering the deep fading stateavgOn the basis of which a compensation quantity delta is superimposedcompOr taking the nearest SIR before entering into deep fading statetgtAnd historical average SIRavgThe average value of (3) increases the consideration of the influence of the deterioration of the downlink channel environment after entering a deep fading state, and the SIR target value SIR used during the deep fading statewindupThe selection is more reasonable, and a self-adaptive adjustment algorithm is adopted to ensure that the SIR is higherwindupAdjust as soon as possible to meet BLERtargetThereby improving the quality of downlink signals and helping the terminal jump out of a deep fading state as soon as possible.
Further, the present invention increases the deep fade state timer TwindupIf at time TmaxThen, if the deep fading exit condition is not satisfied, the SIR will bewindupIncreasing Delta; if T ismaxAnd if the deep fading exit condition is met within the time, directly exiting the deep fading state. When the channel environment is suddenly deteriorated but not in a deep fading environment and the terminal enters the deep fading state by mistake, the SIR target value suitable for the current channel environment is quickly calculated, so that the terminal is helped to jump out of the deep fading state quickly. The problem of the present scheme that the link can not be broken due to the fact that the link can not jump out after the depth fading state is mistakenly entered is solved.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.

Claims (4)

1. A wireless cellular network power control method, the wireless cellular network power control method comprising:
judging whether the terminal enters a deep fading state or not;
if the terminal enters a deep fading state, setting the SIR target value when the terminal enters the deep fading state as the average value of a plurality of SIR target values plus a first incremental value; or setting the initial value of the SIR target value of the terminal entering the deep fading state as the average value of a plurality of SIR target values and the average value of the SIR target value which is the latest before the terminal enters the deep fading state;
if the time that the terminal enters the deep fading state reaches the time threshold value and the terminal does not exit the deep fading state, the SIR target value that the terminal enters the deep fading state is adjusted up by a second incremental value, and the time that the terminal enters the deep fading state is cleared.
2. The wireless cellular network power control method of claim 1, wherein the first delta value is 2 dB-4 dB.
3. The method of claim 1 wherein the average of the plurality of SIR target values is an average of the most recent plurality of SIR target values when the BLER value is within a range of 0.7 times the BLER target value and 1.3 times the BLER target value.
4. The wireless cellular network power control method of claim 1, wherein the second delta value is 1dB to 3 dB.
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