WO2004059872A1 - Procede de regulation de puissance dans un systeme de communication mobile amrc large bande - Google Patents

Procede de regulation de puissance dans un systeme de communication mobile amrc large bande Download PDF

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Publication number
WO2004059872A1
WO2004059872A1 PCT/CN2003/000796 CN0300796W WO2004059872A1 WO 2004059872 A1 WO2004059872 A1 WO 2004059872A1 CN 0300796 W CN0300796 W CN 0300796W WO 2004059872 A1 WO2004059872 A1 WO 2004059872A1
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WIPO (PCT)
Prior art keywords
power control
error
interference ratio
loop power
block
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PCT/CN2003/000796
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English (en)
French (fr)
Inventor
Yazhu Ke
Jianwu Dou
Bin Xu
Original Assignee
Zte Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Zte Corporation filed Critical Zte Corporation
Priority to AU2003271025A priority Critical patent/AU2003271025A1/en
Priority to EP03750254.9A priority patent/EP1583256B1/en
Publication of WO2004059872A1 publication Critical patent/WO2004059872A1/zh

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Classifications

    • 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
    • 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
    • H04W52/06—TPC algorithms
    • H04W52/12—Outer and inner loops
    • 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
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • 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
    • H04W52/20—TPC being performed according to specific parameters using error rate
    • 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
    • H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
    • H04W52/225—Calculation of statistics, e.g. average, variance
    • 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

Definitions

  • the present invention relates to a wideband code division multiple access (WCDMA) mobile communication technology, and in particular, to an uplink power control method in a wideband code division multiple access communication system.
  • WCDMA wideband code division multiple access
  • the uplink of a WCDMA system is interference-limited.
  • the transmission power of other user mobile stations (User Equipment, UE for short) is interference.
  • UE User Equipment
  • the base station receives far away from the base station.
  • the signal-to-interference ratio of the mobile station is very small, and the resulting error is very large, forming a near-far effect.
  • the characteristics of mobile users they are usually also affected by the Doppler fading effect and Rayleigh fading of the wireless link. Therefore, for the uplink of the WCDMA system, fast and accurate power control is required to ensure the quality of service (Qos) of the user.
  • Qos quality of service
  • Inner loop power control on the uplink can adjust the transmission power of each mobile station to reduce the effect of near and far effects, as far as possible to ensure that the power of all mobile stations received by the base station is equal, and can also compensate for the Doppler frequency. Mobile and Rayleigh fading, so that each user can meet the QoS of the transmission service.
  • a method for inner loop power control is given in 3GPP TS 25. 214: For the uplink, first the base station performs a Signal to Interference Ratio (SIR) measurement on each wireless link received; then Compare with the target signal-to-interference ratio (Signal to Interference Rat io target, SIRtarget) that the service needs to meet.
  • SIR Signal to Interference Ratio
  • the downlink control channel reports to the target.
  • the mobile station sends a transmit power control command with a bit value of 1; if the signal-to-interference ratio SIR is less than the target signal-to-interference ratio SIRtarget, Then, a transmission power control command with a bit value of 0 is sent to the mobile station on the downlink control channel.
  • the mobile station determines to increase the transmission power or decrease the transmission power according to the received transmission power control command and the power control algorithm specified by the network layer, so as to achieve the purpose of controlling the transmission power.
  • the uplink target signal-to-interference ratio SIRtarget is specified by the network side, so the initial given If the value is much different from the actual required signal-to-interference ratio, then if power control is performed according to a given target signal-to-interference ratio, accurate power control cannot be performed. Therefore, while performing the inner loop power control, the target signal-to-interference ratio SIRtarget needs to be adjusted according to the quality of the service.
  • the adjustment of the target signal-to-interference ratio SIRtarget can be achieved through the outer loop power control, which means that the outer loop power control is the inner loop.
  • the aid of power control is the basis for adjusting the transmit power by the inner loop power control method.
  • the required target signal-to-interference ratio will also change. It is not enough to consider only choosing different inner loop power control methods to overcome channel fading. .
  • the target signal-to-interference ratio required by the service will increase. If the target signal-to-interference ratio is not adjusted, the amount of communication shield will become very poor, which will cause dropped calls. In the case of low speed, the target signal-to-interference ratio required by the service will be reduced. If the target signal-to-interference ratio is not reduced, the user's transmit power will be greater than the required transmit power, thereby increasing interference between users and ultimately affecting the uplink of the cell. capacity.
  • none of the power control methods in the prior art can adaptively adjust the target signal-to-interference ratio according to the actual communication situation, thereby making it impossible to accurately perform power control.
  • the technical problem to be solved by the present invention is to propose a power control method for a wideband code division multiple access mobile communication system, which can determine the adjustment period of the target signal-to-interference ratio according to the Qos levels satisfied by different services, and according to the current actual communication
  • the quality condition adaptively adjusts the target signal-to-interference ratio to ensure that the transmission power of various services in various environments can quickly converge.
  • the main idea of the power control method of the present invention is: the base station measures the signal-to-interference ratio of each wireless link, compares it with the target signal-to-interference ratio set according to the QoS requirements, and controls the signal-to-interference ratio of each link to the target signal.
  • the interference ratio is converged, and the target signal-to-interference ratio is adjusted according to the measured shield amount information, so that the service quality does not fluctuate due to changes in the wireless environment, and a relatively constant communication shield amount is maintained.
  • a power control method for a wideband code division multiple access mobile communication system including the following steps: determining an initial transmission power of a user and an initial uplink target signal-to-interference ratio; performing normal outer loop power control; Measure the signal-to-interference ratio of each uplink wireless link; determine whether the link-to-interference ratio error exceeds the error threshold; if it does not exceed the error threshold, continue to perform normal outer loop power control; if it exceeds the error threshold, Then, the normal outer loop power control is suspended, triggering the high priority outer loop power control; performing the high priority outer loop power control, and returning the execution result; and continuing the normal outer loop power control.
  • the invention rapidly adjusts the target signal-to-interference ratio according to the signal-to-interference ratio error of the link, and performs normal outer loop power control when the error of the signal-to-interference ratio of the link does not exceed the threshold value, and when the error of the signal-to-interference ratio exceeds the threshold value
  • the outer loop power control with high priority is adopted.
  • the two-stage outer loop power control is used to ensure the rapid convergence of power control.
  • High-level outer loop power control enabling transmission services to quickly meet service quality requirements, and
  • a threshold report cycle check is used to fine-tune the target signal-to-interference ratio to ensure that the actual signal-to-interference ratio can converge quickly and accurately.
  • the essence is to make the communication quality of the service quickly meet the service quality.
  • the invention also determines the adjustment period of the target signal-to-interference ratio according to the different Qos levels satisfied by different services, and then adopts the method of adaptively adjusting the step size according to the current actual communication quality status, which also enables the power control to further quickly converge.
  • the invention considers the convergence problem of power control from various aspects such as the QoS level of the transmitted service, the mobile communication environment, and the amount of real-time communication shields, and has practical application value.
  • adopting the two-stage outer loop power control method can ensure that the user's transmit power converges quickly, thereby ensuring the quality of service of the transmission service, and at the same time increasing the system capacity.
  • FIG. 1 is a general flowchart of a power control method for a WCDMA communication system according to the present invention
  • FIG. 4 is a schematic diagram of the practical application of the present invention in a WCDMA communication system.
  • the basic principle of the two-level outer-loop power control of the present invention is: when a threshold-triggered measurement report is not received, normal outer-loop power control is performed; when the threshold-triggered measurement report is received, a high-priority external In the loop power control, the normal outer loop power control process is suspended; after the high priority outer loop power control is performed, the normal outer loop power control is still performed.
  • the normal outer loop power control is performed. Previously, a masking period was also set. During the masking period, the normal outer loop power control process no longer counts error blocks. In a WCDMA communication system, normal outer loop power control can be performed when a communication context exists between a user and a Node B. During normal outer loop power control, if a measurement report triggered according to a signal-to-interference error is received, Then the high priority outer loop power control process is started.
  • the overall steps of the power control method of the WCDMA communication system of the present invention are as follows: first determine the user's initial transmit power and initial uplink target signal-to-interference ratio, and start up including inner loop power control and normal outer loop power control
  • the closed loop power control is performed by a radio network controller in a WCDMA system and the inner loop power control is performed by a Node B.
  • the radio network controller performs normal outer-loop power control on the uplink.
  • the normal outer-loop power control is suspended and triggered.
  • the high priority outer loop power control performs power control and returns the execution result.
  • Node B performs the corresponding processing according to the execution result: If the execution result is that no outer loop power control is performed, a timer is started, and after the timer expires, the wireless network controller is started to perform normal outer loop power control. The role is to ensure the convergence time of the inner loop power control; if the execution result is a new target signal-to-interference ratio, a mask period is set to overcome the loop delay, so that the normal outer loop power control is performed during the mask period. The cyclic check CRCI indicates that the error is not processed, and then the wireless network controller continues to perform normal outer loop power control, and iterates.
  • the normal outer loop power control adopts a threshold report cycle check trigger method. Its implementation principle is: Continuously monitor whether there is a cyclic redundancy check (Cyclic Redundancy Check-CRC) error, and if there is an error, count the number of erroneous data blocks (that is, the number of erroneous blocks) within a given error block tolerance period. If the number of error blocks counted during the error block tolerance period exceeds the error block threshold, the value of the target signal-to-kill ratio is increased, where the error block tolerance period is a data transmission block window for counting the number of error blocks. The starting point is the error block tolerance period is The first CRC check error data block detected at zero.
  • CRC cyclic redundancy Check-CRC
  • the error block tolerance period is cleared. Because the loop delay is at least 4 to 5 frames, that is, the effect of the just-up adjustment is between 4 to 5 frames. Only then can it be reflected. Therefore, in the 4 to 5 frames after the target signal-to-interference ratio is adjusted, if the CRC indication error occurs again, it will not be adjusted again.
  • the present invention is implemented by setting a mask period. For the mask period, Occurrence of CRC indication errors is not counted. After the time of the masking period is reached, if there is still a CRC indication error, then adjustment is made. At this time, because such a large probability error occurs in such a short time, it must be added.
  • the large adjustment step size enables the power control to quickly converge to quickly meet service quality requirements.
  • the down-regulation principle is that if there is no CRC check error within the down-regulation period, the target signal-to-thousand ratio is down.
  • the determination of the down-regulation period reflects the requirements for the service quality of different services.
  • the present invention determines the down-regulation period according to the target block error rate BLER t of different services.
  • the down-regulation period is M * (l / BLER target ), where M is an adjustable Value, the range is 1 ⁇ 3.
  • M is an adjustable Value
  • the relevant thresholds are configured in advance, including the error block threshold, the error block tolerance period, the mask period, and the down-regulation period. Because the receiver receives data at every TTI interval when receiving data, it is necessary to determine whether the received data is correct every TTI time. After the data transmission interval expires, it is determined whether there is a data block indicating a CRC error in the data blocks received within the TTI time. Since several data blocks can be received within each TTI time, if one of the data blocks is received, The CRC indication is wrong, it means that the data block is wrong.
  • the correct block counter is cleared to further determine whether it is currently in a masking state, that is, whether a masking period is set. If it is currently in a masked state, the number of errored blocks is not processed, and the process is repeated until the data transmission interval expires. If it is not currently in the masked state, the number of errored blocks received within the TTI time is counted, that is, the number of errored data blocks received in the TTI is added to the errored block number counter, and the errored block tolerance counter is added with the The total number of data blocks received in the TTI.
  • the present invention adopts an adaptive adjustment step size.
  • the method is to record the number of times that the target signal-to-interference ratio is continuously increased, and determine that the step-up is proportional to the number of times that the target signal-to-interference ratio is continuously adjusted. Increase the target signal-to-thousand ratio based on the step-up, that is, add the current target signal-to-interference ratio plus the adjustment step as the new target signal-to-interference ratio, and then notify Node B. Lastly, a masking period is set, that is, a timer is set, and the number of errored blocks during the masking period is not counted. When the timer expires, the masking effect disappears. When the waiting time for the data transmission interval expires, the above steps are repeated.
  • the total number of data blocks received in the TTI time is added to the correct data block counter. Determine whether the current error block tolerance counter is zero. If it is not zero, return to execute and add the error block tolerance counter to the total number of data blocks received within the TTI step and subsequent steps. If it is zero, it is judged whether the correct block counter is greater than or equal to the set down-regulation period. If it is less than the down-regulation period, it returns to waiting for the data transmission interval to expire, and the above steps are repeated.
  • the correct block counter is cleared, the target signal-to-interference ratio is adjusted down according to the initially given adjustment step, and the new target signal-to-interference ratio is notified to Node B.
  • the waiting time for the data transmission interval expires, the above is repeated. step.
  • the UTRAN UMTS Terrestrial Radio Access Network
  • SIRerror the link signal-to-interference ratio error SIRerror.
  • SIRerror the average value of the target signal-to-interference ratio in the 80ms period.
  • the signal-to-interference ratio error SIRerror is also closely related to power control.
  • the outer loop power control is used to correct the initially given target signal-to-interference ratio SIRtarget and the actual target signal-to-interference ratio The situation where the SIRtarget differs greatly or the situation where the target signal-to-interference ratio SIRtarget differs from the target signal-to-interference ratio SIRtarget that should actually be satisfied due to the change of the moving speed.
  • the signal-to-interference ratio error threshold SIRerror_threshold in the table is the decision threshold of the dedicated measurement report triggered by the node B to trigger the signal-to-interference ratio error SIRerror.
  • SIRerror_threshold When the absolute value of the signal-to-interference ratio error SIRerror is greater than the signal-to-interference ratio error threshold SIRerror_ threshold, the node B sends a measurement In other words, the high priority outer loop power control is started.
  • BLER represents the block error rate
  • BLERtarget represents the target block error rate.
  • the first case SIRerror is greater than the SIRerror-threshold, and the measured block error rate BLER cannot meet the required target block error rate BLERtarget, indicating that the target signal-to-interference ratio SIRtarget cannot meet the current
  • the target signal-to-interference ratio SIRtarget needs to be increased, and the increase is the signal-to-interference ratio error SIRerror.
  • Case 2 The signal-to-interference ratio error SIRerror is greater than the signal-to-interference ratio error threshold SIRerror_ threshold, and the measured block error rate BLER just meets the required target block error rate BLERtarget, indicating that the target signal-to-interference ratio SIRtarget needs to be adjusted at this time. The amplitude of the increase is SIRerror.
  • Case 3 The signal-to-interference ratio error SIRerror is greater than the signal-to-interference ratio error threshold SIRerror_ threshold, and the measured block error rate BLER is much smaller than the target block error rate BLERtarget, and the amount of communication shield is very good. At this time, no external loop power control is required. However, considering that the measured signal-to-interference ratio SIR has not yet converged to the target signal-to-interference ratio SIRtarget, it is necessary to directly reduce the transmission power through the inner loop power control to reduce the block error rate. Even if the given target signal-to-interference ratio SIRtarget is much smaller than the measured signal-to-interference ratio SIR, it can be converted into the second or the first case, thereby increasing the target signal-to-interference ratio SIRtarget.
  • Case 4 The absolute value of the signal-to-interference ratio error i SIRerror l is less than or equal to the signal-to-interference ratio error threshold SIRerror- threshold, indicating that the set target signal-to-interference ratio SIRtarget is within the tolerable range. At this time, only the normal external Loop power control.
  • the first and fifth cases are the same as the fourth case.
  • Case two The measured signal-to-interference ratio SIR is smaller than the target signal-to-interference ratio average SIRtarget-ave, and the measured block error rate BLER cannot meet the target block error rate BLERtarget, and the communication quality is relatively poor.
  • the transmission power is directly increased through the inner loop power control to reduce the block error rate, and no outer loop power control is required. Even if a given target signal-to-interference ratio SIRtarget is much larger than the actual signal-to-interference ratio SIR, it will be transformed into the first or second case, thereby reducing the target signal-to-interference ratio SIRtarget.
  • Case two The measured signal-to-kill ratio SIR is greater than the average value of the target signal-to-interference ratio SIRtarget—ave is less SIRerror-threshold, and the block error rate BLER just meets the required target block error rate BLERtarget, In this case, the target signal-to-interference ratio SIRtarget needs to be adjusted down to meet the requirements.
  • the reduction range is SIRerror, and then normal outer loop power control is performed.
  • Case # 2 The measured signal-to-interference ratio SIR is lower than the target SIRtarget-average SIRtarget-ave, and the SIRerror-threshold is smaller, and the measured block error rate BLER is much smaller than the target block error rate BLERtarget, indicating the target signal interference at this time.
  • the target signal-to-interference ratio is much larger than the required SIRtarget.
  • the target signal-to-interference ratio needs to be adjusted down to increase the system capacity.
  • the reduction range is SIRerror, and then normal outer loop power control is performed.
  • the value of the signal-to-interference ratio error threshold SIRerror-threshold can be selected as ldB. From the above discussion, it can be known that when performing outer loop power control, the triggering condition of the signal-to-interference ratio error SIRerror needs to be considered: I SIRerror
  • the threshold A is a maximum value indicating good communication quality, and the value is less than 1. If the value of Diff_Value is greater than the threshold A, it indicates that the current communication quality can just meet the communication quality or cannot meet the communication quality. At this time, the actual signal-to-interference ratio SIR is higher than the target signal thousand than SIRtarget. The target signal-to-interference ratio is adjusted upward, and the adjustment step is set as: the adjustment coefficient X SIRerror, where the adjustment coefficient is based on the signal-to-interference error during the actual test. The corresponding relationship between the SIRerror and the actual step size to be adjusted is determined, and once determined, there is no need to change.
  • the target signal-to-interference ratio is increased to obtain a new target signal-to-interference ratio, which is the original target signal-to-interference ratio plus an adjustment step, and the adjusted new target signal-to-interference ratio is returned to the node B.
  • the value of Dif f -Value is less than or equal to the threshold A, it indicates that the current communication quality is very good, but the actual signal-to-interference ratio SIR has not yet converged to the target signal-to-interference ratio SIRtarget.
  • the power control adjusts the transmission power, and returns to the node B an identification that no outer loop power control is performed.
  • the signal-to-interference ratio error SIRerror is less than 0, it indicates that the measured signal-to-interference ratio SIR is much smaller than the target signal-to-interference ratio SIRtarget, and it is judged whether the Diff_Value value is greater than a set threshold B, which is a communication 3 ⁇ 4: The minimum value of the difference is greater than 1. If the Diff-Value value is greater than the threshold for poor quality, it indicates that the current communication quality is relatively poor, but the actual signal-to-interference ratio SIR has not yet converged to the target signal-to-interference ratio SIRtarget. At this time, no external loop power control is required, waiting for the internal loop.
  • the power control adjusts the transmission power, and returns to the node B an identification that no outer loop power control is performed. If the Diff_Value value is less than or equal to the threshold B, it indicates that the current communication quality can meet the requirements, and the target signal-to-interference ratio needs to be adjusted down.
  • the adjustment step is set as: the adjustment coefficient x SIRerror, and the current target signal-to-interference ratio is subtracted from the adjustment step. To obtain a new target signal-to-interference ratio and return a new target signal-to-interference ratio to the node B.
  • FIG. 4 shows a specific application of the two-stage outer loop power control method of the present invention in a WCDMA communication system.
  • NODEB Node B
  • the RNC can send a measurement control message to NODEB to notify NODEB of the measurement parameters and reporting methods.
  • NODEB and RNC each perform the tasks of this module.
  • NODEB judges whether the absolute value of the signal-to-interference ratio error SIRerror exceeds the signal-to-interference ratio error threshold SIRerror-threshold. If the absolute value exceeds the threshold, the measurement report is satisfied. Trigger conditions, NODEB sends a measurement report to the RNC, otherwise NODEB continues to measure the signal-to-interference ratio SIR and does not send a measurement report to the RNC. In the RNC, the normal outer loop power control is performed. The RNC obtains the CRCI (Cyclic Redundancy Code Face Correction Indication) of each transmission data block according to the data frame transmitted by NODEB, so as to count the error of each wireless link.
  • CRCI Cyclic Redundancy Code Face Correction Indication
  • Block rate and then obtain a new target signal-to-interference ratio SIRtarget through outer loop power control, and then send the target signal-to-interference ratio SIRtarget to NODEB through data frames, and NODEB then performs inner-loop power control based on the new target signal-to-interference ratio SIRtarget to adjust the user Transmit power.
  • NODEB triggers the RNC to suspend normal outer-loop power control through the measurement report, and starts to execute the high-priority outer-loop power control, so that the target signal-to-interference can converge to SIRtarget faster than A value that satisfies the quality of the transmission service.
  • the adjusted target signal-to-interference ratio SIRtarget is transmitted to NODEB through the data frame, and the normal outer loop power control is restarted.
  • the high-priority outer-loop power control is executed only when the trigger condition is met, and exits after execution. Then, the corresponding processing is performed according to the identifier returned by the high-priority outer-loop power control.
  • the outer loop power control is suspended, a timer is started, and the normal outer loop power control is started after the timer expires; if a new uplink target signal-to-interference ratio is returned, the normal outer loop power control is immediately started.

Description

宽带码分多址移动通信系统的功率控制方法 技术领域
本发明涉及宽带码分多址（WCDMA )移动通信技术， 具体地说， 涉及在宽带 码分多址通信系统中上行链路的功率控制方法。
背景技术
WCDMA系统的上行链路是干扰受限的， 对于该系统中的某个移动台来说， 其它用户移动台 （User Equipment , 简称 UE ) 的发射功率都是干扰。 由于移动 台在小区中是随机分布的， 因此有的移动台离基站较远， 有的移动台离基站较 近， 如果对所有的移动台都采用相同的发射功率， 则基站接收到的远离基站的 移动台的信干比就非常小， 造成的误码则非常大， 形成远近效应。 另一方面， 因为移动用户的特点， 通常也受无线链路的多普勒（Doppler )衰落效应和瑞利 ( Rayleigh )衰落的影响。 因此， 对于 WCDMA系统的上行链路， 需要进行快速 准确的功率控制， 以保证用户的服务质量（Qual i ty of Service, 简称 Qos)。
对上行链路实行内环功率控制， 可以调整每个移动台的发射功率， 减小远 近效应的影响， 尽可能保证基站接收到的所有移动台的功率都相等， 同时也可 以弥补多普勒频移和瑞利衰落所带来的影响， 从而使每个用户都能满足传输业 务的 Qos。 在 3GPP TS 25. 214中给出了内环功率控制的方法： 对于上行链路， 首先基站对接收到的每条无线链路进行信干比（Signal to Interference Ratio , 筒称 SIR)测量； 然后与业务需满足的目标信干比（Signal to Interference Rat io target , 简称 SIRtarget)进行比较， 若某条无线链路的 信干比 SIR大于等于目标信干比 SIRtarget, 则在下行的控制信道向该移动台 发送比特值为 1的发射功率控制命令；若信干比 SIR小于目标信干比 SIRtarget, 则在下行的控制信道向该移动台发送比特值为 0的发射功率控制命令。 移动台 根据收到的发射功率控制命令和网络层指定的功率控制算法， 判断增加发射功 率或减小发射功率， 以达到控制发射功率的目的。 然而随着移动通信环境的变 化和移动速度的变化， 传输的业务需满足的信干比也需要变化， 上行链路的目 标信干比 SIRtarget是由网络侧指定的， 因此会出现初始给定的值与实际需要 的信干比相差较多的情况， 这时如果再按照给定的目标信干比进行功率控制的 话， 则无法进行准确的功率控制。 因此在进行内环功率控制的同时， 需要根据 业务的质量情况调整目标信干比 SIRtarget , 对目标信干比 SIRtarget 的调整 可通过外环功率控制来实现， 也就是说外环功率控制是内环功率控制的辅助， 是内环功率控制方法调整发射功率的依据。
公开号为 CN 1270459 A的中国专利申请"改进码分多址中的信道自适应快速 功率控制"， 考虑到由于市区环境中的无线信道衰减变化特别快，使得由于环路 而形成的延迟不能完全反映实时的信道衰减情况，因此在进行内环功率控制时， 根据不同的通信环境（市区、 郊区或农村）采用不同的内环功率控制算法， 并 在硬件上得以实现。 尽管该专利申请考虑了由于环路延时而不能及时跟踪信道 衰减的问题， 并选择不同的内环功控算法来解决此问题， 但是内环功率控制的 标准是目标信干比， 如果移动台的速度或其他通信环境发生了改变， 为了满足 业务所需的服务质量， 其所需的目标信干比也会发生变化， 只考虑选择不同的 内环功率控制方法克服信道衰落是远远不够的。 当用户移动速度增加很快时， 业务所需的目标信干比会增大， 如果不调整目标信干比， 会造成通信盾量变得 很差， 从而导致掉话； 对于用户移动速度从高速变到低速的情况， 业务所需的 目标信干比会减小， 如果不降低目标信干比， 则用户的发射功率会大于所需的 发射功率， 从而增加用户间的干扰， 最终影响小区的上行容量。 综上所述， 现有技术的功率控制方法都不能根据实际的通信情况自适应地 调整目标信干比， 从而造成无法准确地进行功率控制。
发明内容
本发明所要解决的技术问题在于提出一种宽带码分多址移动通信系统的 功率控制方法，可才艮据不同业务所满足的 Qos等级确定目标信干比的调整周期， 并根据当前实际的通信质量状况自适应调整目标信干比， 保证各种业务在各种 环境下的发射功率都能快速收敛。
本发明所述功率控制方法的主要思想是： 基站测量每条无线链路的信干 比， 与根据 QoS要求设定的目标信干比进行比较， 控制每条链路的信干比向目 标信干比收敛， 同时根据测量得到的盾量信息调整目标信干比， 以使业务质量 不因无线环境的变化而发生波动， 保持相对恒定的通信盾量。
本发明的目的是这样实现的： 一种宽带码分多址移动通信系统的功率控制 方法， 包括以下步骤： 确定用户的初始发射功率和初始上行目标信干比； 进行 正常的外环功率控制； 测量每条上行无线链路的信干比； 判断链路信干比误差 是否超过误差门限值； 如果未超过误差门限值，继续进行正常的外环功率控制； 如果超过误差门限值， 则挂起正常的外环功率控制， 触发高优先级的外环功率 控制； 进行高优先级的外环功率控制， 返回执行结果； 继续进行正常的外环功 率控制。
本发明根据链路的信干比误差快速调整目标信干比的值， 当链路信干比的 误差未超过门限值时进行正常的外环功率控制， 当信干比的误差超过门限值时 则采用高优先级的外环功率控制； 通过两级外环功率控制以保证功率控制的快 速收敛， 当给定的目标信干比与实测的信干比相差较大时， 采用高优先级的外 环功率控制， 使得传输业务能够快速满足服务质量的要求， 同时当目标信干比 与实测的信干比相差较小时， 采用门限报告循环校验对目标信干比进行微调， 保证实际的信干比能够快速精确地收敛， 其本质是使得业务的通信质量能够快 速地满足服务质量。 本发明还根据不同业务所满足的 Qos等级的不同确定目标 信干比的调整周期，才艮据当前实际的通信质量状况采用自适应调整步长的方法， 也使得功率控制进一步快速地收敛。 本发明从所传输业务的 Qos等级、 移动通 信环境、 实时的通信盾量等多方面来考虑功率控制的收敛问题， 具有实际的应 用价值。 总之， 采用两级外环功控的方法可以保证用户的发射功率快速收敛， 从而保证传输业务的服务质量， 同时又可以提高系统的容量。
附图说明
图 1为本发明 WCDMA通信系统功率控制方法的总体流程图；
图 2为本发明中正常的外环功率控制流程图；
图 3为本发明中高优先级的外环功率控制流程图；
图 4为本发明在 WCDMA通信系统中的实际应用示意图。
具体实施方式
下面结合附图和具体实施例对本发明做进一步地详细说明。
本发明实现两级外环功率控制的基本原理为： 当没有收到门限触发的测量 报告时， 则执行正常的外环功率控制； 当收到门限触发的测量报告后， 启动高 优先级的外环功率控制， 正常的外环功率控制过程被挂起； 在执行完高优先级 的外环功率控制后， 仍然执行正常的外环功率控制。
由于环路延时需至少 4 ~ 5帧，也就是说对目标信干比上调的效果需在 4 ~ 5 帧之后才能反映出来， 因此在目标信干比上调后、 执行正常的外环功率控制 之前， 还设置了屏蔽周期， 在屏蔽周期内正常的外环功率控制过程不再进行误 块统计。 在 WCDMA通信系统中， 当用户与节点 B之间通信上下文存在时就可以进行 正常的外环功率控制， 在进行正常的外环功率控制期间， 如果收到根据信干比 误差触发的测量报告， 则启动高优先级的外环功率控制进程。
如图 1所示， 本发明 WCDMA通信系统的功率控制方法的总体步骤是： 首先 确定用户的初始发射功率和初始上行目标信干比， 启动包括内环功率控制和正 常的外环功率控制在内的闭环功率控制， 其中外环功率控制在 WCDMA系统中的 无线网络控制器执行， 内环功率控制在节点 B执行。 无线网络控制器对上行链 路进行正常的外环功率控制， 在控制过程中， 如果收到来自节点 B的信干比误 差触发的测量 4艮告， 则挂起正常的外环功率控制， 触发高优先级的外环功率控 制进行功率控制， 并返回执行结果。 节点 B根据执行结果进行相应的处理： 如 杲执行结果是不进行外环功率控制， 则启动定时器， 定时器到时后启动无线网 络控制器进行正常的外环功率控制， 在这里定时器的作用是保证内环功率控制 收敛的时间； 如果执行结果是新的目标信干比值， 则设置屏蔽周期， 克服环路 延时， 使得在执行正常的外环功率控制时在屏蔽周期内对出现的循环校验 CRCI 指示错误不进行处理， 然后继续由无线网络控制器进行正常的外环功率控制， 循环往复。
在本发明中， 正常的外环功率控制采用了门限报告循环校验触发的方法。 其实现原理为： 不断监测是否有循环冗余校验 ( Cycl ic Redundancy Check-CRC ) 错误，如果有错误，则在给定的误块容忍周期内统计错误数据块数（即误块数）。 如果在误块容忍周期内统计的误块数超过了误块门限，则上调目标信千比的值， 其中误块容忍周期是统计误块数的数据传输块窗口， 起点是误块容忍周期为零 时监测到的第一个 CRC校验错误的数据块。 当误块容忍周期到达后将误块容忍 周期清零。 由于环路延时最少有 4 ~ 5帧， 也就是说刚上调的效果在 4 ~ 5帧之 后才能反映出来。 因此在上调目标信干比之后的 4 ~ 5 帧中， 如果再出现 CRC 指示错误的话， 则对其不再进行调整， 对此本发明是采用设置屏蔽周期的方式 来实现的， 对于屏蔽周期内出现的 CRC指示错误不进行统计， 等屏蔽周期的时 间到达后， 如果发现还存在 CRC指示错误， 则再进行调整， 这时由于在这么短 的时间里出现了这么大概率的错误， 因此得加大调整步长， 使得功率控制能够 快速收敛， 以快速满足服务质量要求。 而下调原则是如杲在下调周期内没有出 现 CRC校验错误， 则下调目标信千比。 对下调周期的确定体现了不同业务的服 务质量的要求， 本发明根据不同业务的目标误块率 BLERt 确定下调周期， 下 调周期为 M* (l/BLERtarget) , 其中 M是一个可调整的值， 范围定为 1 ~ 3。 而对于 下调步长， 是初始给定的， 不再进行调整。
正常的外环功率控制具体流程如图 1 所示。 首先预先配置相关的门限值， 包括误块门限、 误块容忍周期、 屏蔽周期和下调周期。 由于接收方在接收数据 时是每隔一个传输时间间隔 TTI ,接收一次数据， 因此判断接收的数据是否正确 也应是每隔 TTI 时间进行的。 待数据传输间隔到时后， 判断在该 TTI时间内收 到的数据块中是否有 CRC指示错误的数据块， 由于在每个 TTI时间内可以接收 到若干个数据块， 如果其中某个数据块的 CRC指示为错误， 则说明该数据块是 错误的。 如果接收到的数据块中有错误的数据块， 则将正确块计数器清零， 进 一步判断当前是否处于屏蔽状态， 即是否设置了屏蔽周期。 如果当前处于屏蔽 状态， 则对出现的误块数不进行处理， 返回等待数据传输间隔到时， 重复上述 步驟。 如果当前不处于屏蔽状态， 则统计该 TTI 时间内收到的误块数， 即在误 块数计数器中加上该 TTI 内收到的错误数据块数， 同时在误块容忍计数器中加 上该 TTI 内收到的总数据块数。 判断误块容忍计数器的值是否大于等于设定的 误块容忍周期， 如果小于误块容忍周期， 则返回等待数据传输间隔到时， 重复 上述步驟。 如果大于等于误块容忍周期， 则判断误块计数器的值是否大于等于 误块门限， 如果小于误块门限， 则返回等待数据传输间隔到时， 重复上述步骤。 如果大于等于误块门限， 表明当前需要上调目标信干比， 将误块计数器、 误块 容忍计数器清零以便下一轮的判断调整， 然后确定上调步长， 本发明采用自适 应调整步长的方法， 即记录连续上调目标信干比的次数， 确定上调步长与连续 上调目标信干比的次数成正比； 当目标信干比下调时， 则清除以前记录的上调 目标信干比的次数。 根据上调步长上调目标信千比， 即把当前的目标信干比加 上调整步长作为新的目标信干比， 然后通知节点 B。 最后设置犀蔽周期， 即设置 一个定时器， 在屏蔽周期内出现的误块数不进行统计， 定时器到时后屏蔽作用 消失， 返回等待数据传输间隔到时， 重复上述步骤。
如果在 TTI时间内收到的数据块中没有错误的数据块， 则在正确数据块计 数器中加上该 TTI时间内收到的总数据块数。 判断当前的误块容忍计数器是否 为零， 如果不为零， 则返回执行将误块容忍计数器加上该 TTI时间内收到的总 数据块数 步骤及后续步骤。 如果为零， 则判断正确块计数器是否大于等于设 定的下调周期， 如果小于下调周期， 则返回等待数据传输间隔到时， 重复上述 步骤。 如果大于等于下调周期， 则将正确块计数器清零， 按照初始给定的调整 步长下调目标信干比， 并将新的目标信干比通知节点 B, 返回等待数据传输间 隔到时， 重复上述步驟。
在实际的通讯过程中， 由于移动通信环境的变化和移动速度的变化， 导致 传输的业务需满足的信干比也需要变化， 为了使功率控制收敛得更快， 对于链 路信干比误差超过误差门限值的情况， 采用了高优先级的外环功率控制。
在 3GPP TS 25. 215协议中提到在 UTRAN (UMTS Terres trial Radio Access Network)侧需测量链路信干比误差 SIRerror, 该信干比误差 SIRerror是当前 时刻测量得到的信干比 SIR 与一定周期内的目标信干比 SIRtarget 的平均值 SIRtarget_ave的差, 即 SIRerror=SIR— SIRtarget— ave, 在本实施例中， 选择 80ms周期内目标信干比的平均值。 信干比误差 SIRerror与功率控制也是密切 相关的，根据信 '干比误差 SIRerror的值，采用外环功率控制以纠正初始给定的 目标信干比 SIRtarget的值与实际应满足的目标信干比 SIRtarget相差较大的 情况或者因为移动速度的变化使得目标信干比 SIRtarget与实际应满足的目标 信干比 SIRtarget相差较大的情况。
表 1 给出了实际通讯过程中可能出现的 9 种情况及其对应的目标信干比 SIRtarget调整方法。表中信干比误差门限 SIRerror— threshold是节点 B触发 信干比误差 SIRerror上报专用测量报告的判决门限， 当信干比误差 SIRerror 的绝对值大于信干比误差门限 SIRerror— threshold时， 节点 B发送测量 4艮告， 启动高优先级的外环功率控制。 表中 BLER表示误块率， BLERtarget表示目标 误块率。
Figure imgf000010_0001
Figure imgf000010_0002
下面对表 1的 9种情况做一详细说明。
第 ①种情况： 信干比误差 SIRerror 大于信干比误差 门 限 SIRerror— threshold, 且实测的误块率 BLER 不能满足所需的目标误块率 BLERtarget, 说明此时的目标信干比 SIRtarget不能满足当前业务的要求， 需 上调目标信干比 SIRtarget , 上调的幅度为信干比误差 SIRerror。 第 ②种情况： 信干比误差 SIRerror 大于信干比误差 门 限 SIRerror— threshold , 且实测的误块率 BLER 正好满足所需的目标误块率 BLERtarget , 说明此时的目标信干比 SIRtarget需上调， 上调的幅度为信干比 误差 SIRerror。
第③种情况： 信干比误差 SIRerror 大于信干比误差 门 限 SIRerror— threshold,且实测的误块率 BLER比目标误块率 BLERtarget小很多 , 通信盾量非常好，此时无需进行外环功率控制；但考虑到现在实测的信干比 SIR 还未收敛到目标信干比 SIRtarget , 因此还需通过内环功率控制来直接减小发 射功率以降低误块率。即使是给定的目标信干比 SIRtarget比实测的信干比 SIR 小 4艮多的情况， 也可以转化为第②种或第①种情况， 从而上调目标信干比 SIRtarget。
第④种情况： 信干比误差绝对值 i SIRerror l小于等于信干比误差门限 SIRerror— threshold, 说明设置的目标信干比 SIRtarget在所能容忍的范围之 内， 此时只需进行正常的外环功率控制。 对于第⑤、 ⑥种情况， 与第④种情况 相同。
第⑦种情况： 实测的信干比 SIR 比目标信干比平均值 SIRtarget-ave 小 SIRerror— threshold, 且实测误块率 BLER不能满足目标误块率 BLERtarget , 通信质量比较差。 考虑到当前的信干比 SIR还未收敛到目标信干比 SIRtarget, 因此通过内环功率控制来直接增加发射功率以减小误块率， 无需进行外环功率 控制。即使遇到给定的目标信干比 SIRtarget比实际信干比 SIR大很多的情况， 也会转化到第⑧种或第⑨种情况， 从而下调目标信干比 SIRtarget。
第⑧种情况： 实测的信千比 SIR比目标信干比的平均值 SIRtarget— ave小 SIRerror-threshold, 且误块率 BLER正好满足所需的目标误块率 BLERtarget, 则此时需下调目标信干比 SIRtarget才能满足要求， 下调的幅度为 SIRerror, 然后再进行正常的外环功率控制。
第⑨种情况： 实测的信干比 SIR比目标信干比的平均值 SIRtarget— ave小 SIRerror-threshold,且实测的误块率 BLER比目标误块率 BLERtarget小很多， 说明此时的目标信干比 SIRtarget比所需的目标信干比 SIRtarget大很多 , 需 要下调目标信干比才能提高系统的容量， 下调的幅度为 SIRerror , 然后再进行 正常的外环功率控制。
在上述 9种情况中，信干比误差门限 SIRerror-threshold的值可以选择为 ldB。 通过上面的论述可知， 在进行外环功率控制时， 需考虑信干比误差 SIRerror 的触发条件： I SIRerror | >SIRerror_threshold, 此触发条件的优先 级最高， 即当此条件满足时， 触发专用测量报告消息， 无线网络控制器在收到 此消息后执行高优先级的外环功率控制。
参见图 3 为高优先级的外环功率控制的流程。 首先计算在大小为 χ一~ - ~一的滑动窗口中的误块率 BLER,并计算实际的误块率 BLER与目标误 BLERlaIgel 块率 BLERtarget 的比值， 定义为偏差比值 Diff— Value, 即有 Diff-Value = BLER/BLERtarget。然后判断信干比误差 SIRerror的值是否大于 0,如果大于 0, 则表明实测的信干比 SIR 比目标信干比 SIRtarget 大 ί艮多， 则进一步判断 Diff -Value值是否大于确定的门限 A, 该门限 A是表示通信质量好的最大值， 取值小于 1。 若 Diff_Value值大于该门限 A， 则表明现在的通信质量刚刚能满 足通信质量或者还不能满足通信质量， 而此时处于实际的信干比 SIR比目标信 千比 SIRtarget高很多的情况， 因此需要对目标信干比进行上调， 设置调整步 长为： 调整系数 X SIRerror, 其中调整系数是在实际测试时， 才艮据信干比误差 SIRerror与实际需要调整的步长的对应关系来确定， 且一旦确定后无需改变。 然后上调目标信干比，获得新的目标信干比为原来的目标信千比加上调整步长， 将调整后新的目标信干比返回给节点 B。 如果 Dif f -Value值小于等于门限 A, 则表明当前的通信质量非常好， 但实际的信干比 SIR还没有收敛到目标信干比 SIRtarget , 此时不需要进行外环功率控制， 等待内环功率控制调整发射功率， 向节点 B返回不进行外环功率控制的标识。
如果信干比误差 SIRerror小于 0， 则表明实测的信干比 SIR比目标信干比 SIRtarget小很多， 则判断 Diff— Value值是否大于设定的门限值 B, 该门限 B 是表示通信 ¾：量差的最小值， 取值大于 1。 如果 Diff -Value值大于质量差的门 限， 则表明现在的通信质量比较差， 但实际的信干比 SIR还没有收敛到目标信 干比 SIRtarget , 此时不需要进行外环功率控制， 等待内环功率控制调整发射 功率， 向节点 B返回不进行外环功率控制的标识。如果 Diff—Value值小于等于 门限 B, 则表明当前的通信质量已能满足要求， 需下调目标信干比， 设置调整 步长为： 调整系数 x SIRerror , 将当前目标信干比减去调整步长， 获得新的目 标信干比， 并向节点 B返回新的目标信干比。
图 4给出了本发明两级外环功率控制方法在 WCDMA通信系统中的具体应用。 在上行方向， 当节点 B (NODEB)与用户间的通信上下文建立起来并且已经开始传 输数据后， RNC可以向 N0DEB发送测量控制消息， 通知 N0DEB测量参数和上报 方式等。 此时 N0DEB和 RNC各自执行本模块的任务。 在 N0DEB中， 对接收到的 每条无线链路信干比 SIR进行周期测量， 并周期计算目标信干比 SIRtarget的 平均值 SIRtarget- ave， 选择测量周期为 80ms , 从而得到信干比误差 SIRerror = SIR- SIRtarget— ave。 然后 N0DEB判断信干比误差 SIRerror的绝对值是否超 过信干比误差门限 SIRerror-threshold, 若超过门限值， 即满足上报测量报告 的触发条件， 则 NODEB向 RNC发送测量报告， 否则 N0DEB继续测量信干比 SIR, 不向 RNC发送测量报告。 在 RNC 中， 开始执行的是正常的外环功率控制， RNC 根据 N0DEB传送上来的数据帧得到每个传输数据块的 CRCI (循环冗余码校臉指 示），从而统计每条无线链路的误块率， 然后通过外环功率控制得到新的目标信 干比 SIRtarget , 再通过数据帧把目标信干比 SIRtarget传送给 NODEB, NODEB 再根据新的目标信干比 SIRtarget进行内环功率控制， 调整用户的发射功率。
当信干比误差 SIRerror的触发条件满足时， NODEB通过测量报告触发 RNC 挂起正常的外环功率控制， 开始执行高优先级的外环功率控制， 使得目标信干 比 SIRtarget能够更快地收敛到满足传输业务的^务质量的值。 当高优先级的 外环功率控制执行完毕后， 通过数据帧把调整后的目标信干比 SIRtarget传送 给 N0DEB, 重新启动正常的外环功率控制。 只要 NODEB和用户之间的通信上下 文存在， 并且数据在具有闭环功率控制的信道上传输， 正常的外环功率控制就 一直被执行。 而高优先级的外环功率控制只在触发条件满足时才被执行， 并且 执行完之后就退出， 然后根据高优先级的外环功率控制返回的标识做相应的处 理： 如杲返回的标识是挂起外环功率控制， 则启动定时器， 等待定时器到时后 才启动正常的外环功率控制； 如果返回的是新的上行目标信干比值， 则马上启 动正常的外环功率控制。
以上实施例仅用以说明本发明而非限制， 尽管参照以上较佳实施例对本发 明进行了详细说明，本领域的普通技术人员应当理解，可以对本发明进行修改、 变形或者等同替换， 而不脱离本发明的精神和范围， 其均应涵盖在本发明的权 利要求范围当中。

Claims

权利要求书
1、 一种宽带码分多址移动通信系统的功率控制方法， 其特征在于， 包括 以下步骤： 确定用户的初始发射功率和初始上行目标信干比； 进行正常的外环 功率控制； 测量每条上行无线链路的信干比； 判断链路信干比误差是否超过误 差门限值； 如果未超过误差门限值， 继续进行正常的外环功率控制； 如果超过 误差门限值， 则挂起正常的外环功率控制， 触发高优先级的外环功率控制； 进 行高优先级的外环功率控制， 返回执行结果； 继续进行正常的外环功率控制。
2、 根据权利要求 1所述的宽带码分多址移动通信系统的功率控制方法， 其特征在于， 所述高优先级的外环功率控制返回的执行结果为不进行外环功率 控制或新的目标信干比值； 如杲执行结果是不进行外环功率控制， 则启动内环 功率控制定时器， 待定时器到时后进行正常的外环功率控制； 如果执行结果是 新的目标信干比值， 则设置屏蔽周期， 待屏蔽周期到时后进行正常的外环功率 控制。
3、 根据权利要求 1所述的宽带码分多址移动通信系统的功率控制方法， 其特征在于， 所述正常的外环功率控制是根据门限报告循环校验触发对目标信 干比进行调整的， 具体是： 监测链路传输数据是否有循环冗余校验错误， 如果 有错误， 则在误块容忍周期内统计错误数据块数即误块数； 如果在误块容忍周 期内统计的误块数超过了误块门限， 则上调目标信干比的值； 如果在下调周期 内链路数据没有出现循环冗余校验错误， 则下调目标信干比。
4、 根据权利要求 3所述的宽带码分多址移动通信系统的功率控制方法， 其特征在于， 在上调目标信干比的值后， 还包括设置屏蔽周期的步骤， 对在屏 蔽周期内出现的循环冗余校验错误的数据块不进行统计。
5、 根据权利要求 4所述的宽带码分多址移动通信系统的功率控制方法， 其特征在于， 所述屏蔽周期的大小为 4-5帧。
6、 根据权利要求 4所述的宽带码分多址移动通信系统的功率控制方法， 其特征在于， 所述误块容忍周期的起始点是当误块容忍周期为零时所监测到的 第一个循环冗余校验错误的数据块； 所述下调周期根据不同业务的目标误块率 确定， 下调周期为 M* (l/BLERtarget) , 其中 BLERtarget表示目标误块率, M是可调的 值， 范围为 1 ~ 3。
7、 根据权利要求 3至 6任一所述的宽带码分多址移动通信系统的功率控 制方法， 其特征在于， 所述正常的外环功率控制具体包括以下步骤：
步骤一， 配置相关的门限值， 包括误块门限、 误块容忍周期、 屏蔽周期和 下调周期；
步骤二， 判断数据传输时间间隔是否到时， 如果未到时， 则重复执行步骤 步骤三， 如果数据传输时间间隔到时， 则判断在该时间间隔收到的数据块 中是否有循环冗余校验错误的数据块， 如果接收到的数据块中没有错误的数据 块， 则转至步骤十四；
步骤四，如果接收到的数据块中有错误的数据块， 则将正确块计数器清零; 步骤五， 判断当前是否处于屏蔽状态， 即是否已设置屏蔽周期， 如果当前 处于屏蔽状态， 则对出现的误块数不进行统计， 返回步骤二；
步骤六， 如果当前不处于屏蔽状态， 则统计该传输时间间隔内收到的误块 数， 即在误块数计数器中加上该传输时间间隔内收到的错误数据块数；
步骤七， 在误块容忍计数器中加上该传输时间间隔内收到的总数据块数； 步骤八， 判断误块容忍计数器的值是否大于等于误块容忍周期， 如果小于 误块容忍周期， 则返回步骤二；
步骤九， 如果误块容忍计数器的值大于等于误块容忍周期， 则判断误块计 数器的值是否大于等于误块门限， 如果小于误块门限， 则返回步骤二；
步骤十， 如果误块计数器的值大于等于误块门限， 则表明当前需要上调目 标信干比， 将误块计数器和误块容忍计数器清零；
步骤十一， 确定上调的调整步长， 并上调目标信干比， 即把当前的目标信 千比加上调整步长作为新的目标信干比；
步骤十二， 将新的目标信干比通知节点 B;
步骤十三， 设置屏蔽周期， 在屏蔽周期内出现的误块数不进行统计， 待屏 蔽周期到期后， 返回步骤二；
步骤十四， 在正确数据块计数器中加上该传输时间间隔内收到的总数据块 数；
步骤十五， 判断当前的误块容忍计数器是否为零， 如果不为零， 则返回步 骤七；
步 十六， 如果当前误块容忍计数器为零， 则判断正确块计数器是否大于 等于下调周期， 如果小于下调周期， 则返回步骤二；
步骤十七，如果正确块计数器大于等于下调周期， 则将正确块计数器清零; 步骤十八， 按照初始给定的下调的调整步长下调目标信干比， 并将新的目 标信干比通知节点 B, 返回步骤二
8 > 根据权利要求 7所述的宽带码分多址移动通信系统的功率控制方法， 其特征在于， 所述确定上调的调整步长为根据记录的连续上调目标信干比的次 数， 确定上调步长与连续上调目标信干比的次数成正比。
9、 根据权利要求 7所述的宽带码分多址移动通信系统的功率控制方法， 其特征在于， 所述设置屏蔽周期为设置一定时 ， 在定时器到时前所出现的误 块数不进行统计。
10、 根据权利要求 1或 1所述的宽带码分多址移动通信系统的功率控制方 法，其特征在于， 所述链路信干比误差是当前时刻测量的信干比与 80ms周期内 目标信干比的平均值之差。
11、 根据权利要求 1或 所述的宽带码分多址移动通信系统的功率控制方 法， 其特征在于， 所述误差门限值为 ldB。
12、 根据权利要求 1或 2所述的宽带码分多址移动通信系统的功率控制方 法， 其特征在于， 所述高优先级的外环功率控制是以信干比误差和实测的误块 率相结合作为判决准则的， 具体是：
步骤一、 计算滑动窗口中的误块率；
步骤二、 计算偏差比值 =误块率 /目标误块率；
步驟三、 判断信干比误差是否大于 0, 如果小于 0, 则转至步骤六； 步骤四、 如果信干比误差大于 0, 则判断偏差比值是否大于设定的门限 A, 如果偏差比值大于门限 A, 则设置调整步长， 并上调目标信干比， 将调整后新 的目标信干比返回给节点 B; 结束高优先级的外环功率控制；
步骤五、 如果偏差比值小于等于门限 A, 则不需要进行外环功率控制， 向 节点 B返回不进行外环功率控制的标识； 结束高优先级的外环功率控制；
步骤六、 判断偏差比值是否大于设定的门限 B, 如杲大于门限 B, 则不需要 进行外环功率控制， 向节点 B返回不进行外环功率控制的标识； 结束高优先级 的外环功率控制；
步骤七、 如果偏差比值小于等于门限 B, 则设置调整步长， 并下调目标信 干比， 向节点 B返回新的目标信干比。
13、 根据权利要求 12 所述的宽带码分多址移动通信系统的功率控制方 法， 其特征在于， 所述滑动窗口的大小为 M* (l/BLERtarget) , 其中 BLERt t表示 目标误块率， M是可调的值， 范围为 1 ~ 3
14、 根据权利要求 12 所述的宽带码分多址移动通信系统的功率控制方 法， 其特征在于， 所述门限 A是表示通信质量好的最大值， 取值小于 1; 所述 门限 B是表示通信质量差的最小值， 取值大于 1
15、 根据权利要求 12 所述的宽带码分多址移动通信系统的功率控制方 法， 其特征在于， 所述调整步长为： 调整系数 X信干比误差， 所述调整系数是 根据信干比误差与实际需要调整的步长的对应关系确定。
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EP1681781A2 (en) 2005-01-13 2006-07-19 NTT DoCoMo, Inc. Mobile communication system, wireless base station, radio network controller, and power control method
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EP1583256A1 (en) 2005-10-05
CN1514560A (zh) 2004-07-21
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AU2003271025A1 (en) 2004-07-22
EP1583256A4 (en) 2010-05-19
CN100461659C (zh) 2009-02-11
RU2324288C2 (ru) 2008-05-10
EP1583256B1 (en) 2015-10-21

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