WO2003030569A1 - Procede et appareil de regulation du debit de transmission dans des systemes de telecommunication - Google Patents

Procede et appareil de regulation du debit de transmission dans des systemes de telecommunication Download PDF

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Publication number
WO2003030569A1
WO2003030569A1 PCT/CN2002/000071 CN0200071W WO03030569A1 WO 2003030569 A1 WO2003030569 A1 WO 2003030569A1 CN 0200071 W CN0200071 W CN 0200071W WO 03030569 A1 WO03030569 A1 WO 03030569A1
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WIPO (PCT)
Prior art keywords
speed
transmission rate
timer
speed controller
controller
Prior art date
Application number
PCT/CN2002/000071
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English (en)
French (fr)
Inventor
Youqian Xiao
Zhonji Hu
Xueming Wang
Yanming Tan
Original Assignee
Huawei Technologies Co., Ltd.
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.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to AT02700126T priority Critical patent/ATE518401T1/de
Priority to EP02700126A priority patent/EP1437902B1/en
Priority to US10/491,315 priority patent/US7408880B2/en
Publication of WO2003030569A1 publication Critical patent/WO2003030569A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0025—Transmission of mode-switching indication
    • 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
    • H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]

Definitions

  • the present invention relates to a method and apparatus for controlling transmission rate in a communication system, such as a code division multiple access system, and in particular to a transmission power according to a mobile station / base station
  • Method and device for controlling uplink (mobile station to base station) and / or downlink (base station to mobile station) transmission rate between a mobile station and a base station Method and device for controlling uplink (mobile station to base station) and / or downlink (base station to mobile station) transmission rate between a mobile station and a base station.
  • Code division multiple access is a modulation and multiple access connection technology based on spread-spectrum communications.
  • Spread-spectrum communication technology multiplies digital signals with high-speed pseudo-random codes at the signal sending end. Because the rate of pseudo-random codes is much higher than the rate of digital signals, the signal transmission bandwidth is expanded.
  • the same pseudo-random sequence is used to multiply the received signal with a correlation operation to despread the spread spectrum signal.
  • the pseudo-random codes are not completely orthogonal, which results in mutual interference between different channels and different users in the cell.
  • the CDMA system is a self-interference system, in order to prevent near-far effects and change the target signal-to-noise ratio (SIR), both the inner loop power control and the outer loop power control method are used for the uplink and downlink.
  • SIR target signal-to-noise ratio
  • the transmit power of each user is It also needs to be larger, so that the mobile station and base station transmit power also needs to be increased.
  • Increasing the transmission power will increase the interference on the air interface. The greater the interference on the air interface, the more the transmission power will be increased, thus forming a positive feedback of power climb.
  • this positive feedback will cause the transmit power of the mobile station and the base station to increase very quickly, so that the entire system load quickly approaches saturation.
  • the system For user transmit power, in general, when a channel is established or reconfigured, the system allocates a transmit power range to it, which corresponds to the resources allocated to the connection. Admission control was performed when the service was requested before the channel was established, so it can be considered that the system will not crash within the range of the channel transmit power configuration. Conversely, if the system load is close to saturation, it is likely that the channel transmit power will exceed the configured allowable range. At this time, it is necessary for the system to take measures to add a negative feedback control mechanism to reduce the system transmit power to compensate for the positive feedback phenomenon of power climbing. In the present invention, the system load is reduced by reducing the channel transmission power. Within the range allowed by QoS, the channel transmission power can be reduced by reducing the service rate.
  • FIG. 5 shows the curve of the voice quality MOS score (average evaluation score) of each AMR rate mode as a function of C / I (carrier-to-interference ratio).
  • a method for adjusting the data rate is provided. Its characteristics are: First, the increased data rate is determined according to the pilot signal. Second, the data rate is determined based on the difference between the maximum pilot signals in the active and inactive sets. Third, a series of threshold values are used, and each threshold value corresponds to a data rate. Fourth, another method is provided, which is to determine the data rate by using the average adjacent cell capacity load and the received pilot signal strength. There are many serious problems in making rate adjustment decisions based on pilot signals. First, pilots do not directly reflect changes in service rates, and it is difficult to quickly reflect the effect of rate adjustment.
  • the uplink and downlink rate control cannot be processed separately using the pilot signal, because the pilot only reflects the situation of the downlink load.
  • the uplink and downlink services are asymmetric. If the rate cannot be adjusted separately, the service requirements cannot be met, and the uplink and downlink speed adjustments are inconsistent. Unable to process.
  • the technical problem to be solved by the present invention is to provide an uplink / downlink transmission rate between a mobile station and a base station that is independently controlled according to the power of the mobile station / base station in a communication system, so as to improve service quality.
  • the transmission rate control method of the present invention includes a transmission power measuring device that measures the transmission power of the mobile station / base station; compares the measured transmission power with a predetermined threshold to determine whether an event has occurred; and if an event occurs, the speed is adjusted The controller issues a speed adjustment command according to the event type to adjust the uplink and / or downlink transmission rate.
  • the timer further includes a step of judging whether or not the timer itself times out, and if the timer times out, judging that an event has occurred.
  • the transmission rate control device of the present invention includes a transmission power measuring device located in a mobile station / base station, which is used to measure the transmission power of the mobile station / base station, and compares the measured transmission power with a predetermined threshold to determine whether there is An event occurs; a speed regulation controller is configured to receive an event report from a transmission power measuring device, and send a speed regulation command to the mobile station / base station according to the type of event to adjust the uplink and / or downlink transmission rate.
  • the device further includes a timer, and when the timer expires, an event is also reported to the speed controller.
  • the transmission power directly reflects the cell load, the quality of the channel, and the distance of the mobile station from the base station.
  • the transmission power is greater than the maximum threshold, it indicates that the cell is heavily loaded, the channel conditions are poor, and the mobile station reaches the edge of the base station coverage area In this case, lower the data rate to slow down the deterioration of service quality.
  • the radio power is less than the minimum threshold, the surface cell is too lightly loaded, the channel conditions are too good, and the mobile station is relatively close to the base station.
  • the data quality is increased to further improve the service quality.
  • adjusting the data rate by transmitting power can improve the quality of service, and can independently operate the uplink and downlink.
  • the rate decreases, the transmission power decreases, and vice versa. Therefore, the method and device of the present invention can also suppress the phenomenon of rising transmission power. '
  • FIG. 1 shows a general flowchart of rate adjustment according to the method of the present invention.
  • Fig. 2 shows the types of triggering events when the transmit power crosses the threshold when four thresholds are set according to the present invention.
  • Fig. 3 shows a flow chart of specific steps of the speed controller for speed adjustment when four thresholds are set according to the method of the present invention.
  • Fig. 4 shows a flow chart of the specific steps of the speed controller for speed adjustment when two thresholds are set according to the method of the present invention.
  • FIG. 5 shows the curve of the MOS score of speech quality for each AMR rate mode as a function of C / I.
  • FIG. 1 shows a general flowchart of rate adjustment according to the method of the present invention.
  • the method and device for adjusting the uplink transmission rate from the mobile station to the base station as an example, but it should be understood that the method and device of the present invention can also be used for the downlink transmission rate from the base station to the mobile station. Adjustment.
  • a transmission power measuring device in a mobile station a speed controller located in a base station controller, and a timer are reset, wherein the speed controller is initialized to a normal state (step S1).
  • the transmission power measuring device measures the transmission power of the mobile station. Then, the transmission power measuring device compares the measured power with a predetermined threshold, and judges whether an event occurs based on the comparison result (S3).
  • the transmit power threshold 1 indicates a situation where the cell is heavily loaded, the channel conditions are poor, and the mobile station reaches the edge of the coverage area of the base station.
  • the transmit power measurement device When the measured transmit power crosses threshold 1 from bottom to top, the trigger event type 1 is judged; the transmit power thresholds 2 and 3 indicate that the cell load is normal, the channel conditions are normal, and the distance between the mobile station and the base station is normal.
  • the transmission power threshold 4 indicates that the cell is under light load and the channel conditions are very low
  • the trigger event type 4 is determined.
  • step S2 in FIG. 1 further includes a timer to determine whether the timer times out, and if the timer times out, determine the trigger event type 5.
  • the speed controller also performs speed control and adjusts the timer according to the event type (see step S4 in FIG. 1).
  • Fig. 3 shows a flow chart of specific steps of the speed controller for speed adjustment when four thresholds are set according to the method of the present invention.
  • the speed controller receives an event report (S21), and the report includes the event type. If the event type is 1, it means that the transmit power crosses the threshold 1 from bottom to top. Reduce the degree of QoS degradation, and reduce the transmission power by reducing the data rate level to suppress the increase in transmission power.
  • the speed regulation controller determines whether the uplink transmission rate has reached the lowest level at this time, because if the transmission rate reaches the lowest level, it cannot be reduced any more. Therefore, if the judgment result is yes, then no speed adjustment processing is performed (S213), and a timer located in the speed controller is started / restarted (S214), and the timer starts counting.
  • the speed controller determines whether the speed level is the lowest (S241). If the speed level is still the lowest, then the speed controller still does not perform speed adjustment processing (S243), and starts / restarts again. Start the timer (S246). It can be seen that when the transmission power exceeds the threshold 1 and the rate is at the lowest level, the timer is used to track the situation where the transmission rate remains too high even at the lowest data rate.
  • the speed controller issues a speed reduction command, instructs the mobile station to reduce the transmission rate by one level, and the state of the speed controller is set to a speed down state (S212). Then, the timer is started / restarted (S214), and the timer starts counting. When the timer expires and no measurement report is sent from the transmission power measuring device, that is, the event 5 is triggered, this indicates that the effect of the previous rate adjustment is not obvious, and the data rate needs to be reduced again. At this time, the speed controller determines whether the speed is the lowest.
  • step S241 If it is the lowest (S241), then no speed adjustment is performed (S243) and the timer is started / restarted (S246) to maintain the transmission power even at the lowest data rate. Excessive conditions are tracked. However, if it is determined that the data rate is not the lowest, it indicates that there is still room for speed adjustment, and then the current state of the speed controller is determined. Since the speed controller is set to a reduced speed state in step S212, in step S212, If the determination result in S242 is a reduced speed state, the rate is reduced by 1 level again in step S244, and the timer is started / restarted in step S246. If the timer times out again and no other events occur, indicating that the rate needs to be reduced, the above process is repeated.
  • the speed controller judges its own state (S221). If it is in a speed-down state at this time, it sets the speed controller to the normal state (S223) and turns off the timer (S224). If it is determined in step S221 that the speed controller is already in a normal state, no processing is performed on the speed controller (S222).
  • the speed controller determines whether the data rate has reached the highest value (S231). If the data rate has reached the highest value and cannot be increased, the speed control is performed. The processor does nothing (S233), and starts / restarts the timer (S234), and the timer starts counting. If the timing expires, event type 5 is triggered.
  • the speed controller determines whether the data rate is the highest (S241), and if it is still the highest, it does not perform any speed adjustment processing (S243) and starts / restarts the timer (S246) to track the data rate even though the highest The transmit power remains too low.
  • step S231 if it is determined that the data rate has not reached the maximum rate, it indicates that there is still room for speed adjustment. At this time, the speed control controller sends a speed increase command to the mobile station, instructing the mobile station to increase the transmission rate by one level (S232 ), And start / restart the timer (S234), the timer starts counting. If the timer expires and no other events occur, event type 5 is triggered, which indicates that although the data rate is increased by one level, the transmit power still does not reach the normal state, which needs to continue to increase the rate. At this time, the speed controller determines whether the transmission rate has reached the highest level (S241), and if not, determines the state of the speed controller (S242).
  • a trigger event type 3 occurs. At this time, determine the state of the speed controller (S221), if it is in the speed-up state, set the speed controller to the normal state (S223) and turn off the timer, indicating that there is no need to adjust and track the speed. If the speed controller is in a normal state, no processing is performed on it (S222).
  • the method of the present invention can also be used to adjust the downlink transmission rate according to the transmit power of the base station. It can be seen that the method of the present invention can reduce the rate of service quality degradation as much as possible by reducing the rate under adverse conditions such as heavy cell loads. When the cell load is too light, the service quality is improved by increasing the rate. In addition, the rate adjustment can be reflected in the transmission power in time, so it can suppress the increase of the transmission power and further deteriorate the communication environment.
  • Fig. 4 shows a flow chart of the specific steps of the speed controller for speed adjustment when two thresholds are set according to the method of the present invention.
  • the threshold retains threshold 1 and threshold 2, so there are three types of trigger events: transmit power crosses threshold 1 from bottom to top, and event type 1, the speed needs to be reduced when the event is triggered; transmit power from top to bottom Threshold crossing 2, event type 2, when the event is triggered, there is no need to adjust the speed; the timer expires, the event Piece type 5.
  • the steps of the speed controller to perform speed control according to the type of execution event are roughly the same as those shown in FIG. 3, except that when the event type 2 is triggered, the state of the speed controller is determined in step S221. In the normal state, it is not processed (S222), and if it is in the down state, it is set to the normal state (S223) and the timer is started / restarted (S224).
  • the state of acceleration is removed. Because there are only thresholds 1 and 2, which means that there are only two types of rate control: deceleration or no speed adjustment.
  • the speed controller does not perform speed adjustment (S333) and starts / restarts the timer (S334). If not, then reduce the rate by 1 level again (S332), and start / restart the timer.
  • the highest transmit power threshold 1 and the lowest transmit power threshold 4 can also be set, and the original threshold 2 and the threshold 1 are merged, and the original threshold 3 and the threshold 4 are merged, thereby retaining 2 thresholds.
  • trigger events There are five types of trigger events: event type 1, the transmit power crosses threshold 1 from bottom to top, and the event needs to be slowed down when the event is triggered; event type 2, the transmit power crosses threshold 1 from top to bottom, and when the event is triggered, No speed adjustment required; Event type 3, transmission power crosses threshold 4 from bottom to top, no speed adjustment is required when the event is triggered; Event type 4, transmission power crosses threshold 4 from top to bottom, speedup is required when the event is triggered; timing Device timeout, event type 5.
  • the area between the threshold 1 and the threshold 4 is considered to be a normal state area, so that no speed adjustment is required.
  • the process of the speed controller controlling the transmission rate of the mobile station according to these four event types is shown in Figure 3. I won't repeat them here. ⁇
  • the method of the present invention can also be used when only one threshold is set.
  • Set a threshold that is, keep threshold 1, and merge the original threshold 2 with the threshold.
  • trigger events there are three types of trigger events: transmit power crosses threshold 1 from bottom to top, triggering * 1, which requires speed reduction; transmit power crosses threshold 1 from top to bottom, and triggers event 2, without speed adjustment; timer Timeout, trigger event type 5.
  • the specific flow of the speed controller to control the transmission rate of the mobile station according to the event type is shown in Figure 4. .
  • the method of the present invention can also be used in the case of setting three thresholds, that is, reserve threshold 1, threshold 2 or threshold 3, and threshold 4.
  • the specific speed adjustment steps of the speed controller are shown in Figure 2.
  • the method of the present invention can also be used when more than 4 thresholds are set. And the range of speed adjustment by the speed controller can also be different according to the specific application. In short, adjusting the transmission rate according to the change of the transmission power is the gist of the present invention.
  • the invention also discloses a device for controlling the uplink and / or downlink transmission rate between the mobile station and the base station according to the mobile station / base station transmission power in the communication system. It includes a transmission power measurement device in a mobile station / base station, which measures the transmission power of the mobile station / base station and compares the measured transmission power with a predetermined threshold to determine whether an event has occurred. Speed controller, When the transmission power measurement device determines that an event has occurred, it is used to receive an event report from the transmission power measurement device, and issue a speed regulation command to the mobile station / base station according to the event type to adjust the uplink and / or downlink transmission rate.
  • the device of the present invention further includes a timer located in the base station controller, and when the timer expires, an event is also reported to the speed controller. The specific operation process is as described above.
  • the method and apparatus of the present invention can be performed completely without a timer. That is, when adjusting the transmission rate according to the transmission power, the speed is only increased or decreased according to the transmission power crossing the threshold, and the rate is adjusted once when the transmission power crosses the minimum or maximum threshold in a certain direction, and the level of the rate is adjusted once. Can be multi-level. In this way, it is also possible to slow down the degradation of QoS and suppress the power climb when the communication conditions are getting worse, and to improve the quality of the service when the communication conditions are getting better.
  • Rate and reduced call drop rate when the CDMA mobile communication system is under heavy load, it can simultaneously improve service quality and effectively suppress the power climbing phenomenon, thereby reducing the system load, keeping the system stable, and increasing user access. Rate and reduced call drop rate.
  • the rate control algorithm of the present invention is used to adjust the uplink and downlink rates separately, so that the uplink and downlink adjustments can be performed asymmetrically. This makes it possible to configure uplink and downlink resources separately according to the different needs of uplink and downlink traffic.
  • the rate adjustment information comes from the measurement of the transmission power. Because there is power control, the rate adjustment quickly reflects changes in cell load, connection quality, and propagation environment. In this way, the situation of load overload and service quality degradation is quickly balanced.
  • the threshold of the transmit power is set to four or more, and different rate adjustment strategies are performed for each threshold trigger event. In this way, the rate can be precisely controlled according to the load.
  • the rate control algorithm of the present invention when adjusting the service rate, it can increase or decrease by one level at a time, so that the transmission power and the changed cell load do not generate a sudden change. In this way, not only can the system run stably, but also the business will not experience transitions, which can improve the quality of the business and make the system run smoothly. '

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Transmitters (AREA)

Description

在通信系统中控制传输速率的方法和装置 本发明涉及一种在通信系统 (诸如，码分多址系统）中控制传输速率的方法 和装置， 具体地说， 涉及根据移动站 /基站的发射功率控制在移动站和基站之 间的上行 (移动站到基站）和 /或下行 (基站到移动站）传输速率的方法和装置。
码分多址 (CDMA)是一种以扩频通信为基础的调制和多址连接技术。扩频通 信技术在信号发送端以高速伪随机码与数字信号相乘， 由于伪随机码的速率比 数字信号的速率大得多， 因而扩展了信号传输带宽。 在收端， 用相同的伪随机 序列与接收信号相乘， 进行相关运算， 将扩频信号解扩。
然而在 CDMA系统， 伪随机码之间并不是完全正交， 这导致小区内不同信 道和不同用户之间存在相互干扰。 由于 CDMA系统是自干扰系统， 为了防止远 近效应以及改变目标信噪比（SIR) , 对上行链路和下行链路同时采用了内环功 控和外环功控方法。 釆用功率控制的结果， 使得发射功率大小反映了系统和业 务连接的状况， 如小区负载情况， 信道条件好坏以及传播环境下的路径损耗 等。
当系统传播条件改变， 如空中接口上干扰增大， 或者用户离基站比较远， 到了小区的边缘时， 路径损耗增加， 为了使接受端信号达到一定的信躁比， 则 针对各用户的发射功率也需要越大， 从而移动站和基站发射功率也需要增加。 发射功率的增加又会增加空中接口上的干扰， 空中接口上的干扰越大， 又会使 得发射功率增加， 如此形成一个功率攀升的正反馈。 当系统负载达到某个程度 以后， 这个正反馈会使得移动站和基站的发射功率增加得非常快， 从而使得整 个系统负载迅速趋近于饱和状态。
对用户发射功率， 一般来说， 在信道建立或重配置时， 系统为其分配了一 个发射功率范围， 它对应着分配给该连接的资源。 在信道建立之前的业务请求 时进行了准入控制， 因此可认为信道发射功率配置的范围内不会使系统崩溃。 反之， 如果系统负载处于接近饱和状态， 很可能信道发射功率会超越配置的允 许范围。 这时， 系统就有必要釆取措施， 增加一个负反馈控制机制来降低系统 发射功率， 以补偿功率攀升的正反馈现象。本发明中通过降低信道发射功率来 降低系统负载。在 QoS允许的范围内， 又可以通过降低业务速率来降低信道发 射功率。 在小区负载较大和信道条件恶化情况下降低业务速率的另外一条理由 是， 当小区负载增大或者信道条件恶化， 业务速率高的用户与业务速率低的用 户相比， 其服务质量往往会比后者降低得更快。 这种情况可以由 AMR语音业务 的典型例子加以说明。图 5中给出了每种 AMR速率模式的语音质量 M0S分值 (平 均评价分值）随 C/I (载干比）变化的曲线。 由图中可知， 当 C/I变小时， gfJ， 小 区负载变重、 信道条件变差以及移动站离基站较远， 速率高的 AMR模式的 M0S 分值随 C/I的变化减小得比速率低的 AMR模式的变化速率要快。这样导致在小 区传播环境变差的情况下，低速率业务的质量比高速率业务的质量反而相对要 高。 如果这时， 仍然保持原来的高速率， 会使得用户业务质量迅速降低。 如果 在这个时候调低用户的业务传输速率， 则会使得业务质量相对得到改善。
当小区负载较轻时，上面高速率用户和低速率用户服务质量的变化情况和 小区负载较重情况下恰好相反。 虽然， 在小区负载较重的情况下， 一定范围内 降低速率， 可减缓 QoS (业务质量）的降低速度， 从而使 QoS保持在一定的范围 内。 但是业务 QoS整体上毕竟降低了。 因此， 当系统资源允许时， 提升业务速 率， 可以提高业务质量， 所以我们应尽量以最大的速率传输语音和数据。 即当 系统负载变低时， 需要以适当的步骤增加数据速率， 以提供更好的 QoS。
在美国专利 6，088，335 (名为 "向用户提供基于负载和干扰的命令分配服 务的码分多址系统 (Code division multiple access system providing load and interference based demand assignment service to users) " )中描述 了一种调节数据速率的方法。 其特点是： 一， 根据导频信号来决定增加的数据 速率。二，基于活动集和非活动集中最大导频信号的差值来决定数据速率。三， 利用一系列门限值，每一个门限值对应一个数据速率。四，提供了另一个方法， 即， 利用平均邻接小区容量负载和接收到的导频信号强度来决定数据速率。根 据导频信号来进行速率调整判决， 存在很多严重的问题。 首先， 导频不直接反 映业务速率的变化， 对速率调整的效果很难迅速反应出来。 其次， 利用导频信 号无法做到上下行速率控制分开处理， 因为导频仅仅反应的是下行负载的情况 。 而 CDMA中， 业务上下行是不对称的， 如果不能分开进行速率调整， 则不能 满足业务的需求， 而且对上下行调速不一致的情况， 如上行该调高， 下行该调 低的情况， 根本无法处理。
本发明要解决的技术问题是提供一种在通信系统中根据移动站 /基站的功 率独立地控制在移动站和基站之间的上行 /下行传输速率， 以提高业务质量的 方法和装置。
在本发明的传输速率控制方法中， 包括发射功率测量装置测量移动站 /基 站的发射功率； 将测得的发射功率与预定门限相比较， 判断是否有事件发生； 如果有事件发生， 则调速控制器根据事件类型发出调速命令以调整上行和 /或 下行传输速率。
在该方法中， 还包括定时器判断本身是否超时， 如果超时则判断有事件发 生的步骤。
在本发明的传输速率控制装置中， 包括位于移动站 /基站中的发射功率测 量装置， 用于测量移动站 /基站的发射功率， 并将测得的发射功率与预定门限 相比较， 判断是否有事件发生； 调速控制器， 用于接收来自发射功率测量装置 的事件报告，并根据事件类型向移动站 /基站发出调速命令以调整上行和 /或下 行传输速率。
在该装置中， 还包括定时器， 当定时器超时， 也向所述调速控制器报告事 件。
由于发射功率的大小直接反映了小区负载情况、信道的好坏以及移动站离 基站的远近， 当发射功率大于最高门限， 则表明小区负载重、 信道条件过差以 及移动站到达基站覆盖区的边缘的情况，此时通过调低数据速率以减缓业务质 量变差的速度。 而当射功率小于最低门限， 则表面小区负载过轻、 信道条件过 好以及移动站离基站比较近的情况，此时通过提高数据速率以进一步提高业务 质量。 可见， 通过发射功率来调整数据速率， 能够提高业务质量， 而且能够上 行链路和下行链路独立操作。 此外， 由于速率变化能够及时导致发射功率的变 化， δΡ， 速率降低， 则发射功率减小， 反之亦然， 所以本发明的方法和装置还 能够抑制发射功率攀升的现象。 '
图 1示出根据本发明的方法， 进行速率调整的总流程图。
图 2示出根据本发明设定 4个门限的情况下，发射功率穿越门限触发事件 的类型。
图 3示出根据本发明的方法， 当设定 4个门限时， 调速控制器进行速率调 整的具体步骤的流程图。
图 4示出根据本发明的方法， 当设定 2个门限时， 调速控制器进行速率调 整的具体步骤的流程图。
图 5示出每种 AMR速率模式的语音质量 MOS分值随 C/I变化的曲线。 下面， 参照图 1-4具体描述本发明的较佳实施例， 从而本发明的特征及优 点对于熟悉本技术领域的人员而言是显而意见的。
图 1示出根据本发明的方法， 进行速率调整的总流程图。 在此， 为了说明 清楚， 我们以移动站到基站的上行链路传输速率的调整方法及装置为例子， 但 应理解本发明的方法和装置同样可用于从基站到移动站的下行链路传输速率 的调整。
如图 1所示， 首先初始化移动站内的发射功率测量装置、位于基站控制器 内的调速控制器并复位定时器， 其中将所述调速控制器初始化为正常状态（步 骤 Sl)。在步骤 S2中， 发射功率测量装置测量移动站的发射功率。然后， 发射 功率测量装置将测得的功率与预定的门限相比较，并根据比较结果判断是否有 事件发生（S3)。
下面， 参照图 2说明事件判断标准。 在本发明的该较佳实施例中， 预先设 定 4个发射功率门限： 发射功率门限 1表示小区负载很重、 信道条件很差且移 动站到达基站覆盖区边缘的情况， 当发射功率测量装置测得的发射功率从下往 上穿越门限 1时， 即判断触发事件类型 1 ; 发射功率门限 2和 3表示小区负载 正常、 信道条件正常， 以及移动站离基站的距离正常的情况， 当发射功率测量 装置测得的发射功率从上往下穿越门限 2或者测得的发射功率从下往上穿越门 限 3时， 分别触发事件类型 2和 3; 发射功率门限 4表示小区负载过轻、 信道 条件非常好且移动站到达基站的情况， 当发射功率测量装置测得的发射功率从 上往下穿越门限 4时， 判断触发事件类型 4。
现在， 回到图 1继续说明本发明的调速方法。 当发射功率测量装置判断有 事件发生时， 立即将测量报告发送到基站控制器内的调速控制器， 该测量报告 包括事件类型。 接着， 调速控制器根据事件类型向移动站发出调速命令。 其具 体步骤如图 3所示。 值得指出的是， 在本实施例的调速方法中， 在图 1的步骤 S2 中还包括定时器判断是否超时， 且如果定时器超时， 则判断触发事件类型 5。 同样， 调速控制器也会按照该事件类型进行调速控制同时调整定时器（如图 1中的步骤 S4)。
图 3示出根据本发明的方法， 当设定 4个门限时， 调速控制器进行速率调 整的具体步骤的流程图。
首先， 调速控制器接收事件报告（S21)， 该报告包括事件类型。 如果事件 类型是 1， 即表明发射功率从下往上穿越门限 1， 此时需要降低速率等级以减 缓 QoS变差的程度，并通过降低数据速率等级来减小发射功率以抑制发射功率 攀升的现象。 在步骤 S211中， 调速控制器判断此时上行传输速率是否已达到 最低等级， 因为如传输速率达到最低等级， 便不能再降低了。 因此， 如果判断 结果是的话， 则不做调速处理 (S213) , 并启动 /重启动位于调速控制器内的定 时器（S214) , 定时器便开始计时。 当定时器超时触发事件类型 5时， 调速控制 器判断速率等级是否为最低 (S241) , 如果速率等级还是最低， 那么调速控制器 仍然不做调速处理（S243)， 并再次启动 /重启动定时器（S246)。 可见， 当发射 功率超越门限 1且速率处于最低等级时，利用定时器对数据速率即使最低但发 射功率却保持过高的情况进行跟踪。
回到步骤 S211 , 当判断速率等级没有达到最低， 那么调速控制器发出降 速命令， 命令移动站将发送速率降低 1级， 且调速控制器的状态设为降速状态 (S212)。 接着， 启动 /重启动定时器（S214)， 定时器开始计时。 当定时器超时 且未收到发射功率测量装置发来的测量报告， 即触发事件 5时， 这表明上一次 速率调整效果不明显， 还需要再次降低数据速率。 此时， 调速控制器判断速率 是否为最低， 如果为最低（S241) , 则不做调速处理（S243)同时启动 /重启动定 时器（S246)以对数据速率即使最低但发射功率却保持过高的情况进行跟踪。但 是， 如果判断数据速率不为最低， 则表示还有调速的余地， 则判断调速控制器 的当前状态， 由于在步骤 S212中， 调速控制器被设为降速状态， 因此， 在步 骤 S242中的判断结果是降速状态， 则在步骤 S244中再次将速率降低 1级， 并 在步骤 S246 中启动 /重启动定时器。 如果定时器再次超时且未有其它事件发 生， 表明还需降低速率， 则重复上述流程。
如果在定时器计时期间内， 由于降低传输速率导致发射功率下降， 从而从 上往下穿越了门限 2 而触发事件 2， 这表明小区负载情况等得到改善趋于正 常， 则无需在对数据速率做任何调整。 此时， 调速控制器判断自身的状态 (S221) , 如果此时它处于降速的状态， 则将调速控制器设为正常状态 (S223)并 关闭定时器（S224)。 如果在步骤 S221 中的判断结果是调速控制器已处于正常 状态， 则不对调速控制器做任何处理 (S222)。
当小区负载、信道条件以及移动站离基站的远近情况不断得到改善并达到 过好的情况， 此时我们希望提高传输速率来提高业务质量 QoS。 当出现上述情 况， 致使发射功率从上往下穿越门限 4， 触发事件类型 4时， 调速控制器判断 数据速率是否已达到最高（S231)， 如果已达到最高而无法再提高， 则调速控制 器不做任何处理（S233)， 且启动 /重启动定时器（S234)， 且定时器开始计时。 如果定时超时， 即触发事件类型 5。 此时， 调速控制器判断数据速率是否为最 高 (S241)， 如果还为最高， 则不做任何调速处理（S243)且启动 /重启动定时器 (S246)， 以跟踪数据速率即使最高但发射功率却保持过底的情况。
回到步骤 S231 , 如果判断数据速率没有达到最高速率， 则表明还有调速 的余地， 此时， 调速控制器向移动站发出提速的命令， 命令移动站将发送速率 提高 1个等级（S232) , 且启动 /重启动定时器（S234) , 定时器开始计时。 如果 定时器超时且无其它事件发生， 则触发事件类型 5， 这表明虽然将数据速率提 高 1级， 但是发射功率还是未达到正常状态， 这就需要继续调高速率。 此时， 调速控制器判断发送速率是否已达最高等级（S241)， 如果不是， 则判断调速控 制器的状态（S242)。 若当前调速控制器处于升速状态， 则再将速率提高 1 级 (S245) , 并启动 /重启动定时器 (S246)。 若定时器超时且未有其它事件发生， 则表明还需提高速率， 则重复上述过程。
若由于提高速率， 使得发射功率提高而从下往上穿越门限 3， 触发事件类 型 3发生。 此时， 判断调速控制器的状态 (S221) , 如果它处于升速状态则将调 速控制器设置为正常状态 (S223)且关闭定时器，表明无需对速率做任何调整和 跟踪。 如果调速控制器处于正常状态， 则不对它做任何处理 (S222)。
以上是对设置 4个门限的情况，根据移动站的发射功率调整上行传输速率 的方法描述。 当然， 本发明的方法还可同样用于根据基站的发射功率调整下行 传输速率。 可见， 通过本发明的方法可以在小区负载重等不利情况下， 通过减 低速率来尽量减缓业务质量恶化的程度。 而当小区负载过轻等状况下， 通过提 高速率来提高业务质量。 此外， 速率调整又能够及时反映在发射功率上， 因此 能够抑制发射功率攀升并进一步恶化通信环境的情况。
对于熟悉本技术领域的人员而言， 对上述实施例的各种变化是显而易见 的。 例如， 在上述实施例中， 门限设有 4个， 当然也可以是 1个或 2个或更多 个。
下面， 参照图 4说明门限是 2个情况。 图 4示出根据本发明的方法， 当设 定 2个门限时， 调速控制器进行速率调整的具体步骤的流程图。
在图 4中， 门限保留门限 1和门限 2， 因此触发事件类型有 3种： 发射功 率从下往上穿越门限 1， 事件类型 1， 触发该事件时， 需要降速； 发射功率从 上往下穿越门限 2， 事件类型 2， 触发该事件时， 无需调速； 定时器超时， 事 件类型 5。 调速控制器根据执行事件类型进行调速控制的步骤与如图 3所示的 大致相同， 所不同的是， 在触发事件类型 2时， 在步骤 S221中判断调速控制 器的状态，如果处于正常状态，不对它进行处理（S222) ,而如果处于降速状态， 则将它设为正常状态（S223)并启动 /重启动定时器（S224)。 在此， 去掉了升速 的状态。 因为， 只有门限 1和 2， 表示只有降速或不调速这两种速率控制。 同 理， 当触发事件类型 5时， 同样只需判断数据速率是否达到最低 (S331)， 如果 是， 则调速控制器不做调速（S333)且启动 /重启动定时器（S334)。 如果不是， 则再次降低速率 1级（S332 ) ， 并启动 /重启动定时器。
另一方面， 还可以设置最高发射功率门限 1和最低发射功率门限 4， 而将 原门限 2与门限 1合并， 原门限 3与门限 4合并， 从而保留 2个门限。 这样触 发事件类型共有 5种： 事件类型 1， 发射功率从下往上穿越门限 1， 触发该事 件时， 需要降速； 事件类型 2， 发射功率从上往下穿越门限 1， 触发该事件时， 无需调速； 事件类型 3， 发射功率从下往上穿越门限 4， 触发该事件时， 无需 调速； 事件类型 4， 发射功率从上往下穿越门限 4， 触发该事件时， 需要提 速； 定时器超时， 事件类型 5。 可见， 在这种情况下， 门限 1和门限 4之间的 区域都被认为是正常状态区域， 从而无需调速。 调速控制器根据这 4种事件类 型分别控制移动站的发送速率的过程如图 3所示。 这里不再赘述。 ·
本发明的方法还可用于仅仅设置 1个门限的情况。设置 1个门限， 即保留 门限 1， 而将原门限 2与门限合并。 此时， 触发事件类型有 3种： 发射功率从 下往上穿越门限 1，触发 *件 1，从而需要降速；发射功率从上往下穿越门限 1， 触发事件 2， 无需调速； 定时器超时， 触发事件类型 5。 其中， 调速控制器根 据事件类型对移动站的传输速率进行控制的具体流程如图 4所示。 . 当然， 本发明的方法还可用于设置 3个门限的情况， 即， 保留门限 1、 门 限 2或门限 3， 门限 4。 当然， 调速控制器的具体调速步骤如图 2所示。 本发 明的方法还可用于设置多于 4个门限的情况。且调速控制器调整速率的幅度也 可根据具体应用不同。 总之， 通过根据发射功率的变化， 来调整传输速率是本 发明的要点。
本发明还揭示了一种在通信系统中， 根据移动站 /基站发射功率控制在移 动站和基站之间的上行和 /或下行传输速率的装置。它包括移动站 /基站内的发 射功率测量装置， 用于测量移动站 /基站的发射功率并将根据测得的发射功率 与预定门限相比较， 判断是否有事件发生； 位于基站控制器内的调速控制器， 当发射功率测量装置判断有事件发生时，用于接收来自发射功率测量装置的事 件报告，并根据事件类型向移动站 /基站发出调速命令以调整上行和 /或下行传 输速率。 本发明的装置还包括位于基站控制器内的定时器， 当定时器超时， 也 向所述调速控制器报告事件。 其具体操作过程如上所述。
本发明的方法和装置可完全在没有定时器的情况下进行。 即， 在根据发射 功率调整传输速率的时候， 仅仅根据发射功率穿越门限的情况升速或降速， 每 当发射功率以一定方向穿越最低或最高门限就调整速率一次，此时一次调整速 率的等级可以是多级。 这样， 也能够在通信情况变差的情况下， 减缓 QoS恶化 程度， 同时抑制功率攀升， 而在通信情况变好的情况下， 提高业务质量的目 的。
采用本发明的方法和装置， 能够达到以下优点-
( 1 )采用本发明的速率控制算法， CDMA移动通信系统在负载较重时， 能 够同时改善业务质量和有效地抑制功率攀升现象， 从而减轻系统负载， 使系统 保持稳定， 并且能够增加用户接入率以及减少了掉话率。
( 2 )采用本发明的速率控制算法， 对上下行速率分别进行调整， 从而使 得上下行调整能够不对称进行。使得能够根据上下行业务量的不同需求来分别 配置上下行资源。
( 3 ) 采用本发明的速率控制算法， 速率调整的信息来自对发射功率的测 量， 因为存在功率控制， 所以， 速率调整快速反映小区负载， 连接质量和传播 环境的变化情况。 从而对负载过载和业务质量降低的情况进行快速的平衡处 理。
( 4)釆用本发明的速率控制算法， 进行业务速率调整时， 对发射功率的 门限值设为 4个， 甚至更多个， 对每一个门限值触发事件分别进行不同的速率 调整策略， 这样可以针对负载程度进行速率精确控制。
( 5 )釆用本发明的速率控制算法， 进行业务速率调整时， 每次可增加或 者降低一级， 使得发射功率和所改变的小区负载不会产生突变。 这样， 不仅使 得系统可以运行平稳， 也使得业务不会出现跳变现象， 从而可以提高业务质 量， 同时使系统运行平稳。 '
( 6)采用本发明的速率控制算法， 进行业务速率调整时， 对一次调整效 果不明显的情况， 通过设置调速定时器， 从而可对速率进行多次调整， 这样能 保证速率调整的有效性， 即其有效地减小负载， 保证业务质量以及补偿传播环 画 0071 境的不利变化。
提供较佳实施例的上面描述，来使得熟悉本技术领域的人员进行或运用本 发明。对于熟悉本技术领域的人员而言， 对这些实施例的各种修改是显而易见 的， 而且可将这里限定的一般原理用于其他实施例而无需进行创造性劳动。 于 是， 本发明并不局限于这里所示的实施例， 而是根据与这里所揭示的原理和新 颖性相一致的最宽范围。

Claims

权 利 要 求 书
1. 一种在通信系统中， 根据移动站 /基站发射功率控制在移动站和基站之 间的上行和 /或下行传输速率的方法， 其特征在于， 包括下列步骤：
发射功率测量装置测量移动站 /基站的发射功率；
将测得的发射功率与预定门限相比较， 判断是否有事件发生； 和 如果有事件发生，则调速控制器根据事件类型发出调速命令以调整上行和 /或下行传输速率。
2. 如权利要求 1所述的方法， 其特征在于， 还包括定时器判断本身是否 超时， 如果超时则判断有事件发生的步骤。
3. 如权利要求 2所述的方法， 其特征在于， 所述预定门限是根据通信系 统负载、 信道好坏以及移动站离基站距离远近的情况来设定的。
4. 如权利要求 3所述的方法， 其特征在于， 所述预定门限至少包括表示 系统负载过载、信道异常变差和移动站到达基站覆盖区域边缘时的最高发射功 率门限。
5. 如权利要求 4所述的方法， 其特征在于， 所述预定门限还可包括一个 或多个表示系统负载、信道好坏和移动站离基站远近都属一般情况时的正常发 射功率门限。
6. 如权利要求 5所述的方法， 其特征在于， 所述预定门限还包括表示系 统负载过轻， 信道很好和移动站到达基站处时的最低发射功率门限。
7. 如权利要求 6所述的方法， 其特征在于， 所述调速控制器根据事件类 型发出调速命令以调整上行和 /或下行传输速率的步骤包括： 如果事件类型是 测得的发射功率从下往上穿越所述最高门限， 贝 IJ :
判断上行和 /或下行传输速率是否已为最低：
如果不为最低， 则将所述传输速率减低 1级且将所述调速控制器设为降 速状态， 和启动 /重启动定时器；
如果为最低， 则不对所述传输速率做调整， 且启动 /重启动定时器。
8. 如权利要求 7中任一权利要求所述的方法， 其特征在于， 所述调速控 制器根据事件类型发出调速命令以调整上行和 /或下行传输速率的步骤还包 括： 如果事件类型是所述测得的发射功率从上往下穿越所述最低发射功率门 限， 则： 判断上行和 /或下行传输速率是否已为最高：
如果不为最高， 则将所述传输速率上升 1级并将所述调速控制器设为升 速状态， 和启动 /重启动定时器；
如果为最高， 则不对所述传输速率做调整， 且启动 /重启动定时器。
9. 如权利要求 8所述的方法， 其特征在于， 所述调速控制器根据事件类 型发出调速命令以调整上行和 /或下行传输速率的步骤还包括： 如果事件类型 是所述测得的发射功率从上往下或从下往上穿越所述正常发射功率门限， 贝1 J : 判断所述调速控制器的状态，
如果所述调速控制器处于正常状态， 则不对所述调速控制器作调整； 如果所述调速控制器处于升速和 /或降速状态， 则将调速控制器设为正 常状态， 且关闭定时器。
10. 如权利要求9所述的方法， 其特征在于， 所述调速控制器根据事件类 型发出调速命令以调整上行和 /或下行传输速率的步骤还包括： 如果事件类型 是定时器超时， 贝 IJ :
判断所述传输速率是否已为所述最高或最低速率，
如果不是， 则判断调速控制器的状态：
如果调速控制器处于降速状态， 则将所述传输速率降低 1级， 并启动 /重启动定时器；
如果调速控制器处于升速状态， 则将所述传输速率上升 1级， 并启动 /重启动定时器；
如果是， 则不对传输速率做调整， 且启动 /重启动定时器。
11. 如权利要求 5所述的方法， 其特征在于， 所述调速控制器根据事件类 型发出调速命令以调整上行和 /或下行传输速率的步骤包括： 如果事件类型是 测得的发射功率从下往上穿越所述最高门限， 贝 IJ :
判断上行和 /或下行传输速率是否已为最低- 如果不为最低，则将所述传输速率减低 1级且将所述调速控制器设为降 速状态， 和启动 /重启动定时器；
如果为最低， 则不对所述传输速率做调整， 且启动 /重启动定时器。
12. 如权利要求 11所述的方法， 其特征在于， 所述调速控制器根据事件 类型发出调速命令以调整上行和 /或下行传输速率的步骤包括： 如果事件类型 是测得的发射功率从上往下穿越所述正常门限， 贝 IJ : 判断所述调速控制器的状态，
如果所述调速控制器处于正常状态， 则不对所述调速控制器作调整； 如果所述调速控制器处于降速状态， 则将调速控制器设为正常状态， 且 关闭定时器。
13. 如权利要求 12所述的方法， 其特征在于， 所述调速控制器根据事件 类型发出调速命令以调整上行和 /或下行传输速率的步骤还包括： 如果事件类 型是定时器超时， 贝 IJ :
判断所述传输速率是否已为所述最低速率，
如果不是， 则将所述传输速率降低 1级， 并启动 /重启动定时器； 如果是， 则不对传输速率做调整， 且启动 /重启动定时器。
14. 一种在通信系统中， 根据移动站 /基站的发射功率控制在移动站和基 站之间的上行和 /或下行传输速率的装置， 其特征在于， 包括：
发射功率测量装置， 用于测量移动站 /基站的发射功率并将根据测得的发 射功率与预定门限相比较， 判断是否有事件发生；
调速控制器， 用于接收来自发射功率测量装置的事件报告， 并根据事件类 型向移动站 /基站发出调速命令以调整上行和 /或下行传输速率。
15. 如权利要求 14所述的装置， 其特征在于， 还包括定时器， 当定时器 超时， 也向所述调速控制器报告事件。
16. 如权利要求 15所述的装置， 其特征在于， 所述预定门限是根据通信 系统负载、 信道好坏以及移动站离基站距离远近的情况来设定的。
17. 如权利要求 16所述的装置， 其特征在于， 所述预定门限至少包括表 示系统负载过载、信道异常变差和移动站到达基站覆盖区域边缘时的最高发射 功率门限。
18. 如权利要求 17所述的装置， 其特征在于， 所述预定门限还可包括一 个或多个表示系统负载、信道好坏和移动站离基站远近都属一般情况时的正常 发射功率门限。 '
19. 如权利要求 18所述的装置， 其特征在于， 所述预定门限还包括表示 系统负载过轻， 信道很好和移动站到达基站处时的最低发射功率门限。
20. 如权利要求 19所述的在， 其特征在于， 所述调速控制器执行如果事 件类型是测得的发射功率从下往上穿越所述最高门限， 贝^
判断上行和 /或下行传输速率是否已为最低： 如果不为最低，则将所述传输速率减低 1级且将所述调速控制器设为降 速状态， 和启动 /重启动定时器；
如果为最低， 则不对所述传输速率做调整， 且启动 /重启动定时器。
21. 如权利要求 20所述的装置， 其特征在于， 所述调速控制器执行如果 事件类型是所述测得的发射功率从上往下穿越所述最低发射功率门限， 则： 判断上行和 /或下行传输速率是否已为最高：
如果不为最高，则将所述传输速率上升 1级并将所述调速控制器设为升 速状态， 和启动 /重启动定时器；
如果为最高， 则不对所述传输速率做调整， 且启动 /重启动定时器。
22. 如权利要求 21所述的装置， 其特征在于， 所述调速控制器执行如果 事件类型是所述测得的发射功率从上往下或从下往上穿越所述正常发射功率 门限， 则:
判断所述调速控制器的状态，
如果所述调速控制器处于正常状态， 则不对所述调速控制器作调整； 如果所述调速控制器处于升速和 /或降速状态， 则将调速控制器设为正 常状态， 且关闭定时器。
23. 如权利要求 22所述的装置， 其特征在于， 所述调速控制器执行如果 事件类型是定时器超时， 贝 IJ :
判断所述传输速率是否已为所述最高或最低速率，
如果不是， 则判断调速控制器的状态：
如果调速控制器处于降速状态， 则将所述传输速率降低 1级， 并将调 速控制器设为降速状态且启动 /重启动定时器；
如果调速控制器处于升速状态， 则将所述传输速率上升 1级， 并将调 速控制器设为升速状态且启动 /重启动定时器；
如果是， 则不对传输速率做调整， 且启动 /重启动定时器。
24. 如权利要求 18所述的装置， 其特征在于， 所述调速控制器执行如果 事件类型是测得的发射功率从下往上穿越所述最高门限， 贝 IJ :
判断上行和 /或下行传输速率是否已为最低：
如果不为最低，则将所述传输速率减低 1级且将所述调速控制器设为降 速状态， 和启动 /重启动定时器；
如果为最低， 则不对所述传输速率做调整， 且启动 /重启动定时器。
25. 如权利要求 24所述的方法， 其特征在于， 所述调速控制器执行如果 事件类型是测得的发射功率从上往下穿越所述正常门限， 贝 IJ :
判断所述调速控制器的状态，
如果所述调速控制器处于正常状态， 则不对所述调速控制器作调整； 如果所述调速控制器处于降速状态， 则将调速控制器设为正常状态， 且 关闭定时器。
26. 如权利要求 25所述的方法， 其特征在于， 所述调速控制器执行如果 事件类型是定时器超时， 贝 IJ : ·
判断所述传输速率是否已为所述最低速率，
如果不是， 则将所述传输速率降低 1级， 并启动 /重启动定时器； 如果是， 则不对传输速率做调整， 且启动 /重启动定时器。
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CN114236287B (zh) * 2021-12-16 2023-12-08 国网上海市电力公司 基于多传感器的配电变压器检测系统及介质

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US7408880B2 (en) 2008-08-05
ATE518401T1 (de) 2011-08-15
US20040242256A1 (en) 2004-12-02
EP1437902A4 (en) 2006-08-16
ES2368994T3 (es) 2011-11-24
CN1167296C (zh) 2004-09-15

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