CN100391301C - A Method of Determining Initial Access Power of Mobile Station after Handover - Google Patents
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Abstract
本发明公开了一种确定移动台切换后初始接入功率的方法，包括以下步骤：在源小区基站设备进行切换判决，确定移动台将要切换到的目标小区后，计算移动台接入目标小区所需的初始接入功率，并启动切换过程；在目标小区准备好无线资源后，源小区基站设备将计算得到的移动台接入目标小区所需的初始接入功率发送给移动台，移动台以此功率向目标小区发起接入。应用本发明所述方法可以实现在网络信号覆盖较差的情况下，移动台以最大的发射功率接入目标小区；而在网络信号覆盖较好的情况下，移动台动态调整接入目标小区的初始接入功率，尽量降低初始接入时的发射功率，从而减小无线信号之间的干扰，提高无线通信的质量，也可以降低了移动台的功耗。
The invention discloses a method for determining the initial access power of a mobile station after handover, which includes the following steps: making handover judgment at the base station equipment of the source cell, after determining the target cell to which the mobile station is to be handed over, calculating the power required for the mobile station to access the target cell The required initial access power, and start the handover process; after the target cell prepares radio resources, the base station equipment of the source cell sends the calculated initial access power required by the mobile station to access the target cell to the mobile station, and the mobile station uses This power initiates access to the target cell. Applying the method of the present invention can realize that in the case of poor network signal coverage, the mobile station accesses the target cell with the maximum transmission power; and in the case of good network signal coverage, the mobile station dynamically adjusts the transmission power of the target cell. Initial access power, try to reduce the transmission power during initial access, thereby reducing the interference between wireless signals, improving the quality of wireless communication, and reducing the power consumption of the mobile station.
Description
技术领域 technical field
本发明涉及到移动通信系统的切换技术，特别涉及到一种确定移动台切换后初始接入功率的方法。The invention relates to the handover technology of the mobile communication system, in particular to a method for determining the initial access power of the mobile station after handover.
背景技术 Background technique
在移动通信系统中，移动台和基站设备之间的信号是通过无线链路进行传输的，因此，在移动台之间、基站设备之间、以及移动台和基站设备之间的无线信号很可能会产生相互干扰，这些干扰将会降低无线通信的质量。为此，在移动台和基站设备的通信过程中，移动台和基站设备需要根据网络信号覆盖情况动态调整其无线信号的发射功率，这种对发射功率的动态调整也称为功率控制。功率控制的目的就是在移动台或者基站设备不需要发射最大的发射功率就能达到较好的传输质量的情况下，降低发射功率，从而降低整网的干扰、减小功耗。In the mobile communication system, the signal between the mobile station and the base station equipment is transmitted through the wireless link, therefore, the wireless signal between the mobile station, between the base station equipment, and between the mobile station and the base station equipment is likely to be Mutual interference will occur, which will degrade the quality of wireless communication. Therefore, during the communication process between the mobile station and the base station equipment, the mobile station and the base station equipment need to dynamically adjust the transmission power of their wireless signals according to the network signal coverage. This dynamic adjustment of the transmission power is also called power control. The purpose of power control is to reduce the transmission power when the mobile station or base station equipment does not need to transmit the maximum transmission power to achieve better transmission quality, thereby reducing the interference of the entire network and reducing power consumption.
由于无线链路分为上行和下行两个方向，一个较好的移动通信系统应使覆盖区内基站设备上行接收信号的功率和移动台下行接收信号的功率达到平衡。否则，如果上行接收信号的强度大于下行接收信号的强度，将会造成上行信号的覆盖范围大于下行信号，即小区边缘的下行信号强度较弱，这样，该小区较弱的下行信号容易被其他小区的强下行信号淹没，造成通话质量较差；而如果下行接收信号的强度大于上行接收信号的强度，即下行信号的覆盖范围大于上行信号，则移动台将驻留在该强信号覆盖的区域内，但是由于在此区域内的上行信号较弱，也将造成通话质量较差。因此，在移动台和基站设备通信的过程中，要尽可能的保证上、下行接收信号的功率平衡。该上、下行接收信号功率平衡原则也是移动通信系统网络优化的一个基本原则。Since the wireless link is divided into uplink and downlink directions, a better mobile communication system should balance the power of the uplink received signal of the base station equipment and the power of the downlink received signal of the mobile station in the coverage area. Otherwise, if the strength of the uplink received signal is greater than that of the downlink received signal, the coverage of the uplink signal will be greater than that of the downlink signal, that is, the strength of the downlink signal at the edge of the cell is weak, so that the weaker downlink signal of the cell is easily blocked by other cells. If the strength of the downlink received signal is greater than that of the uplink received signal, that is, the coverage of the downlink signal is greater than that of the uplink signal, the mobile station will stay in the area covered by the strong signal , but because the uplink signal in this area is weak, the call quality will also be poor. Therefore, in the communication process between the mobile station and the base station equipment, it is necessary to ensure the power balance of the uplink and downlink received signals as much as possible. The principle of power balance between the uplink and downlink received signals is also a basic principle for network optimization of the mobile communication system.
另一方面，在移动通信系统中，为了实现对移动用户呼叫的覆盖与接续，优化呼叫传输质量和网络整体的传输质量，调整网络的业务量负载，提高网络性能，移动通信系统必须能够支持移动台从一个小区切换到另一个小区。On the other hand, in the mobile communication system, in order to achieve the coverage and connection of mobile user calls, optimize the quality of call transmission and the overall network transmission quality, adjust the traffic load of the network, and improve network performance, the mobile communication system must be able to support mobile A station is handed over from one cell to another.
一个典型的切换过程主要包括以下几个基本步骤：A typical handover process mainly includes the following basic steps:
a、移动台所在的源小区根据移动台上报的切换测量消息中所携带服务小区的通话质量和相邻小区的下行信号强度，经过切换判决，确定移动台将要切换到的目标小区；a. The source cell where the mobile station is located determines the target cell to which the mobile station will handover after handover judgment according to the call quality of the serving cell and the downlink signal strength of the adjacent cell carried in the handover measurement message reported by the mobile station;
b、源小区基站设备向目标小区发送切换请求消息；b. The base station equipment of the source cell sends a handover request message to the target cell;
c、目标小区收到切换请求消息后，准备移动台切换接入时需要的无线资源，并向源小区回复应答消息；c. After receiving the handover request message, the target cell prepares the radio resources needed for the mobile station to handover and access, and replies with a response message to the source cell;
d、源小区收到应答消息后，向移动台发送切换命令消息，并在切换命令消息中携带目标小区期望移动台接入的初始接入功率值；d. After receiving the response message, the source cell sends a handover command message to the mobile station, and carries the initial access power value that the target cell expects the mobile station to access in the handover command message;
e、移动台会以此功率值，作为接入目标小区的初始发射功率，利用目标小区的无线资源，接入目标小区。e. The mobile station will use this power value as the initial transmission power for accessing the target cell, and use the wireless resources of the target cell to access the target cell.
在上述现有的移动通信系统切换过程的步骤e中，移动台通常是以最大的发射功率接入目标小区的。并且，在移动台接入目标小区后，移动通信系统根据移动台和基站设备之间的无线通信质量启动功率控制过程，调整移动台以及目标小区基站设备的发射功率，从而达到降低整网干扰的目的。In step e of the handover process of the existing mobile communication system, the mobile station usually accesses the target cell with the maximum transmit power. Moreover, after the mobile station accesses the target cell, the mobile communication system starts the power control process according to the wireless communication quality between the mobile station and the base station equipment, and adjusts the transmission power of the mobile station and the base station equipment of the target cell, so as to reduce the interference of the entire network. Purpose.
但是，在很多情况下，尤其是在网络信号覆盖较好的地区，移动台不需要以最大的发射功率就可以接入目标小区，但是如果在接入过程中，移动台仍然以最大的功率接入，就会增大整个网络无线信号的干扰，从而降低无线通信的质量。However, in many cases, especially in areas with good network signal coverage, the mobile station can access the target cell without using the maximum transmission power, but if the mobile station still receives the target cell with the maximum power during the access process If the input is too large, it will increase the interference of wireless signals in the entire network, thereby reducing the quality of wireless communication.
而且，由于从开始功率控制到移动台以适当的功率发射无线信号还有一段时间的延迟，这样，在功率控制没有完成时，移动台将始终以偏大的功率发射无线信号，如此，不仅将将造成对整网信号的干扰，也会造成移动台的功耗较大。Moreover, since there is still a period of delay from the start of power control to the mobile station transmitting wireless signals with appropriate power, the mobile station will always transmit wireless signals with relatively large power when the power control is not completed. It will cause interference to the signals of the entire network, and will also cause a large power consumption of the mobile station.
发明内容 Contents of the invention
为了解决上述技术问题，本发明提供了一种确定移动台切换后接入功率的方法，可以调整移动台接入目标小区时的接入功率，减小无线信号之间的干扰，同时降低移动台的功耗。In order to solve the above technical problems, the present invention provides a method for determining the access power of the mobile station after handover, which can adjust the access power of the mobile station when accessing the target cell, reduce the interference between wireless signals, and reduce the power of the mobile station at the same time. power consumption.
本发明公开了一种确定移动台切换后初始接入功率的方法，该方法在当前移动台所属的源小区基站设备中设置并保存相邻小区期望接收的上行接收信号功率，所述方法具体为：The invention discloses a method for determining the initial access power of a mobile station after handover. The method sets and saves the uplink received signal power expected to be received by the adjacent cell in the base station equipment of the source cell to which the current mobile station belongs. The method is specifically as follows: :
a、在源小区基站设备进行切换判决，确定移动台将要切换到的目标小区后，源小区基站设备计算移动台接入目标小区所需的初始接入功率，并启动切换过程；a. After the base station equipment in the source cell makes a handover decision and determines the target cell to which the mobile station will switch, the base station equipment in the source cell calculates the initial access power required by the mobile station to access the target cell, and starts the handover process;
b、在目标小区准备好无线资源后，源小区基站设备将计算得到的移动台接入目标小区所需的初始接入功率发送给移动台，移动台以接收到的初始接入功率接入目标小区；b. After the target cell prepares wireless resources, the base station equipment of the source cell sends the calculated initial access power required by the mobile station to access the target cell to the mobile station, and the mobile station accesses the target cell with the received initial access power District;
其中，所述计算移动台接入目标小区所需的初始接入功率具体包括：Wherein, the calculation of the initial access power required by the mobile station to access the target cell specifically includes:
如果移动台上报的目标小区当前的下行接收信号功率小于或者等于目标小区期望接收的上行接收信号功率，则移动台接入目标小区所需的初始接入功率为移动台的最大发射功率；If the current downlink received signal power of the target cell reported by the mobile station is less than or equal to the uplink received signal power expected to be received by the target cell, the initial access power required by the mobile station to access the target cell is the maximum transmit power of the mobile station;
如果移动台上报的目标小区当前的下行接收信号功率大于目标小区期望接收的上行接收信号功率，则移动台接入目标小区所需的初始接入功率为移动台的最大发射功率减去移动台上报的目标小区当前的下行接收信号功率与目标小区期望接收的上行接收信号功率之差。If the current downlink received signal power of the target cell reported by the mobile station is greater than the uplink received signal power expected to be received by the target cell, the initial access power required by the mobile station to access the target cell is the maximum transmit power of the mobile station minus the maximum transmit power reported by the mobile station The difference between the current downlink received signal power of the target cell and the uplink received signal power expected to be received by the target cell.
另外，步骤b所述发送为源小区基站设备通过切换命令将移动台接入目标小区所需的初始接入功率发送给移动台。In addition, the sending in step b is that the base station equipment of the source cell sends the initial access power required by the mobile station to access the target cell to the mobile station through a handover command.
由此可以看出，应用本发明所述的方法可以获得以下有益效果：As can be seen from this, the application of the method of the present invention can obtain the following beneficial effects:
1、在网络信号覆盖较差的情况下，移动台以最大的发射功率接入目标小区，尽可能保证成功实现切换过程；1. In the case of poor network signal coverage, the mobile station accesses the target cell with the maximum transmission power to ensure the successful completion of the handover process as much as possible;
2、在网络信号覆盖较好的情况下，移动台动态调整接入目标小区的初始接入功率，在保证成功实现切换过程的同时，尽量降低接入时的发射功率，从而减小无线信号之间的干扰，提高无线通信的质量；2. In the case of good network signal coverage, the mobile station dynamically adjusts the initial access power to access the target cell, and while ensuring the successful handover process, it minimizes the transmission power during access, thereby reducing the gap between wireless signals. to improve the quality of wireless communication;
3、应用本发明所述的动态调整移动台初始接入功率的方法也减少了现有技术中在移动台切换后的移动通信系统的功率控制过程，使得在频繁的切换过程中，移动台的发射功率不会不断的波动，从而降低了移动台的功耗。3. Applying the method for dynamically adjusting the initial access power of the mobile station according to the present invention also reduces the power control process of the mobile communication system after the mobile station is handed over in the prior art, so that in the frequent handover process, the power of the mobile station The transmission power does not fluctuate continuously, thereby reducing the power consumption of the mobile station.
附图说明 Description of drawings
图1显示了本发明一个优选实施例所述的移动台切换过程。Fig. 1 shows a mobile station handover process according to a preferred embodiment of the present invention.
具体实施方式 Detailed ways
下面结合附图以及具体的实施例对本发明作进一步的详细说明。The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
图1显示了本发明一个优选实施例所述的移动台切换过程。从图1可以看出，应用本发明所述的确定移动台切换后初始接入功率方法的切换过程包括以下步骤：Fig. 1 shows a mobile station handover process according to a preferred embodiment of the present invention. As can be seen from Fig. 1, the handover process of applying the method for determining the initial access power after handover of the mobile station according to the present invention comprises the following steps:
步骤101：源小区基站设备根据移动台上报的切换测量报告数据，进行切换判决，确定移动台将要切换到的目标小区，并读取该目标小区期望接收的上行接收信号功率；Step 101: The base station equipment in the source cell makes a handover decision according to the handover measurement report data reported by the mobile station, determines the target cell to which the mobile station will handover, and reads the uplink received signal power expected to be received by the target cell;
其中，移动通信系统中的每个小区的基站设备都保存有预先设置的相邻小区期望接收的上行接收信号功率，该期望接收的上行接收信号功率是指：能够基本保证该小区基站设备正确接收移动台上行信号的接收功率值。该上行接收信号功率是由移动通信系统根据经验值设定的，并且可以在移动通信系统的运行过程中，根据通话统计数据进行调整。Wherein, the base station equipment of each cell in the mobile communication system stores the preset uplink received signal power expected to be received by the adjacent cell, and the expected received uplink received signal power refers to: it can basically guarantee that the base station equipment of the cell can receive the signal correctly. The received power value of the uplink signal of the mobile station. The uplink received signal power is set by the mobile communication system according to empirical values, and can be adjusted according to call statistical data during the operation of the mobile communication system.
步骤102：源小区的基站设备根据移动台上报的目标小区当前的下行接收信号功率、移动台最大的发射功率和目标小区期望接收的上行接收信号功率，计算移动台接入到目标小区时的初始接入功率；Step 102: The base station equipment of the source cell calculates the initial power of the mobile station when it accesses the target cell according to the current downlink received signal power of the target cell reported by the mobile station, the maximum transmit power of the mobile station, and the expected uplink received signal power of the target cell. access power;
在这一步骤中，根据上、下行接收信号功率平衡原则，移动台上报给源小区基站设备的目标小区当前的下行接收信号功率，与移动台以最大发射功率接入目标小区时，该目标小区基站设备接收的上行接收信号功率基本相当。因此，源小区的基站设备可以通过比较移动台上报的目标小区下行接收信号的功率和目标小区期望接收的上行接收信号功率，就可以基本上判断移动台和目标小区之间网络信号的覆盖情况。In this step, according to the principle of power balance between uplink and downlink received signals, the current downlink received signal power of the target cell reported by the mobile station to the base station equipment of the source cell is the same as the power of the target cell when the mobile station accesses the target cell with the maximum transmission power. The uplink received signal power received by the base station equipment is basically equal. Therefore, the base station equipment of the source cell can basically judge the network signal coverage between the mobile station and the target cell by comparing the power of the downlink received signal of the target cell reported by the mobile station with the power of the uplink received signal expected to be received by the target cell.
在本发明的一个优选实施例中，计算移动台接入到目标小区时的初始接入功率值的方法具体如下：In a preferred embodiment of the present invention, the method for calculating the initial access power value when the mobile station accesses the target cell is specifically as follows:
当移动台上报的目标小区当前的下行接收信号功率小于等于目标小区期望接收的上行接收信号功率时，认为网络信号覆盖较差，设置移动台初始接入功率为移动台的最大发射功率；When the current downlink received signal power of the target cell reported by the mobile station is less than or equal to the uplink received signal power expected to be received by the target cell, it is considered that the network signal coverage is poor, and the initial access power of the mobile station is set to the maximum transmit power of the mobile station;
当移动台上报的目标小区当前的下行接收信号的功率大于目标小区期望接收的上行接收接号功率时，认为网络信号覆盖较好，设置移动台初始接入功率为移动台的最大发射功率减去移动台上报的目标小区当前的下行接收信号功率与目标小区期望接收的上行接收信号功率之差。When the current downlink receiving signal power of the target cell reported by the mobile station is greater than the uplink receiving signal power expected to be received by the target cell, it is considered that the network signal coverage is good, and the initial access power of the mobile station is set to the maximum transmit power of the mobile station minus The difference between the current downlink received signal power of the target cell reported by the mobile station and the uplink received signal power expected to be received by the target cell.
步骤103：源小区基站设备保存在步骤102计算的移动台接入目标小区时的初始接入功率，并触发切换过程；Step 103: The source cell base station equipment saves the initial access power calculated in
步骤104：当目标小区准备好无线资源以后，源小区就将保存的初始接入功率值通过切换命令消息发送给移动台，移动台根据切换命令消息中的初始接入功率值接入目标小区。Step 104: When the target cell prepares radio resources, the source cell sends the stored initial access power value to the mobile station through a handover command message, and the mobile station accesses the target cell according to the initial access power value in the handover command message.
由上述实施例可以看出，本发明所述的确定移动台切换后初始接入功率的方法，可以根据网络信号覆盖的好坏动态调整移动台切换到目标小区的初始接入功率，可以在网络信号覆盖较差的情况下，尽量保证切换的成功；而在网络信号覆盖较好的情况下，在保证切换成功的同时，最大限度的减小移动台切换的目标小区时的初始接入功率，避免了在切换过程中，由于移动台的接入信号过强而造成的对其他移动台信号的干扰，从而降低了整网的干扰。It can be seen from the above embodiments that the method for determining the initial access power of the mobile station after switching according to the present invention can dynamically adjust the initial access power of the mobile station to the target cell according to the quality of network signal coverage, and can be used in the network In the case of poor signal coverage, try to ensure the success of the handover; and in the case of good network signal coverage, while ensuring the success of the handover, minimize the initial access power of the mobile station when switching to the target cell, In the handover process, the interference to other mobile station signals caused by the too strong access signal of the mobile station is avoided, thereby reducing the interference of the entire network.
另外，应用本发明所述的动态调整移动台初始接入功率的方法也简化了现有技术中在移动台切换后的移动通信系统的功率控制过程，使得在频繁的切换过程中，移动台的发射功率不会不断的波动，从而减少了移动台的功耗。In addition, applying the method for dynamically adjusting the initial access power of the mobile station described in the present invention also simplifies the power control process of the mobile communication system after the mobile station is handed over in the prior art, so that in the frequent handover process, the power of the mobile station The transmission power does not fluctuate continuously, thereby reducing the power consumption of the mobile station.
以上举优选的实施例，对本发明的目的、技术方案和优点进行了进一步的详细说明，所应理解的是，以上所述为本发明的优选实施例而已，并不用以显示本发明，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。The preferred embodiments above are cited to further describe the purpose, technical solutions and advantages of the present invention in detail. It should be understood that the above descriptions are only preferred embodiments of the present invention, and are not intended to show the present invention. Within the spirit and principles of the present invention, any modifications, equivalent replacements, improvements, etc., shall be included in the protection scope of the present invention.
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| CN101473676B (en) | 2006-07-03 | 2012-06-27 | 艾利森电话股份有限公司 | Method and device for switching in wireless access network |
| KR101253167B1 (en) * | 2006-08-16 | 2013-04-10 | 엘지전자 주식회사 | Method of controlling Mobile Station uplink output power in mobile communication system |
| CN102421135B (en) * | 2010-09-27 | 2015-05-20 | 电信科学技术研究院 | Method and device for processing interference information |
| CN103650589A (en) * | 2013-07-30 | 2014-03-19 | 华为技术有限公司 | Switching method and user equipment |
| CN106686713B (en) * | 2015-11-10 | 2021-06-25 | 中兴通讯股份有限公司 | Uplink interference control method and device |
| CN110446237B (en) * | 2018-05-03 | 2022-01-28 | 青岛海信移动通信技术股份有限公司 | Intelligent recommendation method for network frequency band and mobile terminal |
| CN112020128B (en) * | 2019-05-29 | 2022-08-30 | 中国电信股份有限公司 | Terminal and transmission power control method thereof |
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