WO2020186445A1 - 基站发射功率调整方法及相关设备 - Google Patents
基站发射功率调整方法及相关设备 Download PDFInfo
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- WO2020186445A1 WO2020186445A1 PCT/CN2019/078648 CN2019078648W WO2020186445A1 WO 2020186445 A1 WO2020186445 A1 WO 2020186445A1 CN 2019078648 W CN2019078648 W CN 2019078648W WO 2020186445 A1 WO2020186445 A1 WO 2020186445A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/021—Services related to particular areas, e.g. point of interest [POI] services, venue services or geofences
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/30—Transmission power control [TPC] using constraints in the total amount of available transmission power
- H04W52/32—TPC of broadcast or control channels
Definitions
- the present invention relates to the field of communication technology, and more specifically, to a base station transmitting power adjustment method and related equipment.
- MBSFN Multicast Broadcast Single Frequency Network
- eMBMS evolved Multicast Broadcast Multimedia Service, enhanced multimedia broadcast multicast service
- MA MBSFN Area, MBSFN area
- the area of an MA is usually equivalent to the sum of several or even dozens of unicast cells, which means that the wireless signal propagating in the MA will experience more than it in the unicast cell before reaching the receiving device.
- the multipath delay To offset the ISI (Inter-Symbol Interference, Inter-Symbol Interference) caused by this multipath delay, eMBMS uses a 16.6 ⁇ s CP (called Extended Cyclic Prefix in the LTE protocol) in the physical layer.
- the CP of the above length can only offset the ISI in the smaller area of the MA.
- the CP of the above length cannot offset, and the users at the edge of the MA will face more than the MA. Serious ISI for users near the center.
- the MCS Modulation and Coding Scheme
- the MCS Modulation and Coding Scheme
- the present invention is proposed to provide a base station transmit power adjustment method and related equipment that overcome the above problems or at least partially solve the above problems.
- the specific plan is as follows:
- a method for adjusting base station transmit power comprising:
- the target area is an area in the service coverage area MA of the enhanced multimedia broadcast multicast service eMBMS that needs to adjust the base station transmission power, and the center of the target area is the center of the MA;
- the determining the first radius of the target area includes:
- the first distance is the first radius of the target area.
- the determining the first radius of the target area further includes:
- the second distance is the first radius of the target area.
- the dividing the target area into multiple sub-areas includes:
- the target area is divided into N sub-areas according to the number of layers of physical base stations included in the target area, and the value of N is less than or equal to the number of layers of physical base stations included in the target area.
- the respectively adjusting the transmit power of the base stations in the multiple sub-regions includes:
- P i ′ is the adjusted transmit power of the base station in the i-th sub-area
- i is the sub-area index
- the value from the center of the target area to the edge i is 0 to N-1
- P is the MA
- ⁇ p is the step of the desired base station to adjust the transmission power.
- a base station transmitting power adjustment device includes:
- the first determining unit is configured to determine a first radius of a target area, the target area being an area in the service coverage area MA of the enhanced multimedia broadcast multicast service eMBMS where the base station transmission power needs to be adjusted, and the center of the target area is The center of the MA;
- a second determining unit configured to determine the second radius of the protection area of the current system cyclic prefix CP
- a partition unit configured to divide the target area into multiple sub-areas when the first radius is greater than the second radius
- the transmitting power adjusting unit is used to adjust the transmitting power of the base stations in the multiple sub-regions respectively.
- the first determining unit includes:
- the acquiring subunit is used to acquire the preset threshold
- a first distance determining subunit configured to determine a first distance between a position in the MA where the signal path loss PL is equal to the preset threshold value and the center of the MA;
- the first radius determining subunit is used to determine that the first distance is the first radius of the target area.
- the first determining unit further includes:
- a second distance determining subunit for determining a second distance between the edge position of the MA and the center of the MA
- the first radius determining subunit is specifically configured to determine that the first distance is the first radius of the target area when the first distance is less than the second distance; When the second distance is used, it is determined that the second distance is the first radius of the target area.
- the partition unit is specifically used for:
- the target area is divided into N sub-areas according to the number of layers of physical base stations included in the target area, and the value of N is less than or equal to the number of layers of physical base stations included in the target area.
- the transmit power adjustment unit is specifically configured to:
- P i ′ is the adjusted transmit power of the base station in the i-th sub-area
- i is the sub-area index
- the value from the center of the target area to the edge i is 0 to N-1
- P is the MA
- ⁇ p is the step of the desired base station to adjust the transmission power.
- a base station transmitting power adjustment device includes a processor, a memory, and a program stored in the memory and capable of running on the processor.
- the processor implements the following steps when executing the program:
- the target area is an area in the service coverage area MA of the enhanced multimedia broadcast multicast service eMBMS that needs to adjust the base station transmission power, and the center of the target area is the center of the MA;
- the processor is further used to implement the following steps when executing the program:
- the first distance is the first radius of the target area.
- the processor is further used to implement the following steps when executing the program:
- the processor is specifically configured to implement the following steps when executing the program:
- the target area is divided into N sub-areas according to the number of layers of physical base stations included in the target area, and the value of N is less than or equal to the number of layers of physical base stations included in the target area.
- the processor is specifically configured to implement the following steps when executing the program:
- P i ′ is the adjusted transmit power of the base station in the i-th sub-area
- i is the sub-area index
- the value from the center of the target area to the edge i is 0 to N-1
- P is the MA
- ⁇ p is the step of the desired base station to adjust the transmission power.
- a storage medium having a program stored thereon, and when the program is executed by a processor, the method for adjusting the transmission power of a base station as described above is realized.
- a processor which is used to run a program, wherein the method for adjusting base station transmit power as described above is executed when the program is running.
- the base station transmit power adjustment method and related equipment provided by the present invention are based on the existing eMBMS architecture design.
- the CP length is not increased, the spectrum efficiency is not reduced, and the mobile phone is not compromised.
- the system throughput rate can be improved.
- FIG. 1 is a schematic diagram of the service coverage area MA of the enhanced multimedia broadcast multicast service eMBMS provided by an embodiment of the present invention
- FIG. 2 is a schematic flowchart of a method for adjusting base station transmit power disclosed in an embodiment of the present invention
- FIG. 3 is a schematic diagram of dividing a target area into N sub-areas according to the number of layers of physical base stations contained in the target area according to an embodiment of the present invention
- Figure 4 is a schematic structural diagram of a base station transmit power adjustment device disclosed in an embodiment of the present invention.
- the prior art offsets it by increasing the length of the CP.
- the two commonly used increased CP lengths are 33 ⁇ s and 200 ⁇ s.
- the present invention proposes a base station transmit power adjustment method, which is based on the existing eMBMS architecture design, through the entire network coordinated power control, without increasing the CP length, without reducing the spectrum efficiency, without losing support for mobility Under the circumstances, the system throughput rate can be improved. It will be specifically described in the following embodiments.
- the overall contour shape of the MA may be more diverse.
- the present invention uses the 3GPP to analyze the MA and MBSFN channels A similar method is used to establish a set of ideal models: take a cell as the center and an approximately regular circular area including many surrounding cells as an MA, as shown in Figure 1.
- the broadcast multicast signal received by the UE side is the multipath delay superposition of the original signal.
- the signal with the greatest difference between the shortest propagation path and the longest propagation path is used as a model.
- the shortest propagation path signal is generally sent by the base station closest to the UE, with the least loss of power and the largest contribution to the UE’s receiving performance, called the main path signal; the longest path signal is generally sent by the base station farthest from the UE and is very likely After multiple reflections, it is called the longest path signal.
- Figure 2 is a schematic flowchart of a base station transmit power adjustment method disclosed in an embodiment of the present invention.
- the method is executed by the base station's superior equipment, such as but not limited to a network management system.
- the method includes the following steps :
- Step S101 Determine the first radius of the target area.
- the target area is an area in the service coverage area MA of the enhanced multimedia broadcast multicast service eMBMS where the base station transmission power needs to be adjusted, and the center of the target area is the center of the MA;
- the determining the first radius of the target area includes:
- the first distance is determined to be the first radius (r) of the target area.
- the corresponding circular area is the target area R.
- the determining the first radius of the target area includes:
- the second distance is the first radius of the target area.
- the selection of Thres should be large enough to ensure that the interference intensity of signals other than R to the UE in the MA central cell is negligible.
- the signal path loss PL can be calculated based on, but not limited to, the use of path loss models such as Okumura-Hata or COST231Hata, or can be obtained by field measurement.
- Step S102 Determine the second radius of the protection area of the current system cyclic prefix CP;
- the current system cyclic prefix CP is the CP with a length of 16.6 ⁇ s.
- the protection area of the current system cyclic prefix CP is fixed, and the second radius of the protection area of the current system cyclic prefix CP can be determined accordingly.
- Step S103 When the first radius is greater than the second radius, divide the target area into multiple sub-areas;
- the target area defines a range that can affect the central cell. In the present invention, it is necessary to determine whether the maximum distance max ⁇ D in the target area exceeds the protection range ⁇ D_CP of the current system CP.
- Figure 3 lists two cells located at the center and the edge of the target area. The UE located in the central cell not only receives the multicast broadcast signal from the local cell, but also receives the multicast broadcast signal from the remote cell. In the present invention, the target area The maximum distance difference max ⁇ D that may occur within the target area is approximately equal to the first radius of the target area.
- the present invention according to the relationship between the second radius of ⁇ D_CP and the first radius, it is judged whether it needs to be partitioned. If the first radius is greater than the second radius, it means that the current system CP cannot protect the maximum path difference and needs to be partitioned. If the radius is less than or equal to the second radius, it indicates that the current system CP can protect the maximum path difference without partitioning.
- the target area is divided into N sub-areas according to the number of layers of physical base stations contained in the target area, and the value of N is less than or equal to the number of physical base stations contained in the target area. Number of layers. As shown in Figure 3.
- Step S104 Adjust the transmit power of the base stations in the multiple sub-regions respectively.
- P i ′ is the adjusted transmit power of the base station in the i-th sub-area
- i is the sub-area index
- the value from the center of the target area to the edge i is 0 to N-1
- P is the MA
- ⁇ p is the step of the desired base station to adjust the transmission power.
- FIG. 4 is a schematic structural diagram of a base station transmit power adjustment device disclosed in an embodiment of the present invention.
- the device includes:
- the first determining unit 51 is configured to determine a first radius of a target area, where the target area is an area in the service coverage area MA of the enhanced multimedia broadcast multicast service eMBMS where the base station transmission power needs to be adjusted, and the center of the target area is The center of the MA;
- the second determining unit 52 is configured to determine the second radius of the protection area of the current system cyclic prefix CP;
- the partition unit 53 is configured to divide the target area into multiple sub-areas when the first radius is greater than the second radius;
- the transmitting power adjusting unit 54 is configured to adjust the transmitting power of the base stations in the multiple sub-regions respectively.
- the first determining unit includes:
- the acquiring subunit is used to acquire the preset threshold
- a first distance determining subunit configured to determine a first distance between a position in the MA where the signal path loss PL is equal to the preset threshold value and the center of the MA;
- the first radius determining subunit is used to determine that the first distance is the first radius of the target area.
- the first determining unit further includes:
- a second distance determining subunit for determining a second distance between the edge position of the MA and the center of the MA
- the first radius determining subunit is specifically configured to determine that the first distance is the first radius of the target area when the first distance is less than the second distance; When the second distance is used, it is determined that the second distance is the first radius of the target area.
- the partition unit is specifically used for:
- the target area is divided into N sub-areas according to the number of layers of physical base stations included in the target area, and the value of N is less than or equal to the number of layers of physical base stations included in the target area.
- the transmit power adjustment unit is specifically configured to:
- P i ′ is the adjusted transmit power of the base station in the i-th sub-area
- i is the sub-area index
- the value from the center of the target area to the edge i is 0 to N-1
- P is the MA
- ⁇ p is the step of the desired base station to adjust the transmission power.
- the base station transmitting power adjustment device includes a processor and a memory, the above-mentioned units are stored in the memory, and the processor executes the above-mentioned program units stored in the memory to realize corresponding functions.
- the processor contains the kernel, which calls the corresponding program unit from the memory.
- One or more cores can be set.
- the memory may include non-permanent memory in computer-readable media, random access memory (RAM) and/or non-volatile memory, such as read-only memory (ROM) or flash memory (flash RAM), and the memory includes at least one Memory chip.
- RAM random access memory
- ROM read-only memory
- flash RAM flash random access memory
- the embodiment of the present invention provides a storage medium on which a program is stored, and when the program is executed by a processor, the method for adjusting the transmission power of a base station is implemented.
- the embodiment of the present invention provides a processor configured to run a program, wherein the base station transmit power adjustment method is executed when the program is running.
- the embodiment of the present invention provides a base station transmit power adjustment device.
- the device includes a processor, a memory, and a program stored on the memory and running on the processor, and the processor implements the following steps when executing the program:
- the target area is an area in the service coverage area MA of the enhanced multimedia broadcast multicast service eMBMS where the base station transmission power needs to be adjusted, and the center of the target area is the center of the MA;
- the processor is further used to implement the following steps when executing the program:
- the first distance is the first radius of the target area.
- the processor is further used to implement the following steps when executing the program:
- the processor is specifically configured to implement the following steps when executing the program:
- the target area is divided into N sub-areas according to the number of layers of physical base stations included in the target area, and the value of N is less than or equal to the number of layers of physical base stations included in the target area.
- the processor is specifically configured to implement the following steps when executing the program:
- P i ′ is the adjusted transmit power of the base station in the i-th sub-area
- i is the sub-area index
- the value from the center of the target area to the edge i is 0 to N-1
- P is the MA
- ⁇ p is the step of the desired base station to adjust the transmission power.
- the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, this application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.
- a computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
- These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device.
- the device implements the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.
- These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment.
- the instructions provide steps for implementing functions specified in a flow or multiple flows in the flowchart and/or a block or multiple blocks in the block diagram.
- the computing device includes one or more processors (CPU), input/output interfaces, network interfaces, and memory.
- processors CPU
- input/output interfaces network interfaces
- memory volatile and non-volatile memory
- the memory may include non-permanent memory in a computer readable medium, random access memory (RAM) and/or non-volatile memory, such as read-only memory (ROM) or flash memory (flash RAM).
- RAM random access memory
- ROM read-only memory
- flash RAM flash memory
- Computer-readable media include permanent and non-permanent, removable and non-removable media, and information storage can be realized by any method or technology.
- the information can be computer-readable instructions, data structures, program modules, or other data.
- Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, CD-ROM, digital versatile disc (DVD) or other optical storage, Magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media can be used to store information that can be accessed by computing devices. According to the definition in this article, computer-readable media does not include transitory media, such as modulated data signals and carrier waves.
- this application can be provided as methods, systems, or computer program products. Therefore, this application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, this application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.
- computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
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Abstract
本发明公开了一种基站发射功率调整方法及相关设备,是基于现有eMBMS架构设计,通过全网协同功率控制,在不增加CP的长度,不降低频谱效率、不损失对移动性支持的情况下能够提高系统吞吐率。
Description
本发明涉及通信技术领域,更具体的说,是涉及一种基站发射功率调整方法及相关设备。
MBSFN(Multicast Broadcast Single Frequency Network,多播广播单频网)是提供eMBMS(evolved Multicast Broadcast Multimedia Service,增强型多媒体广播多播业务)业务的多个相邻小区组成的单频网络,MBSFN的业务覆盖区域称为一个MA(MBSFN Area,MBSFN区域)。
一般情况下,一个MA的面积通常相当于几个甚至几十个单播小区的总和,这意味着在MA内传播的无线信号在到达接收设备之前,会比其在单播小区内经历更大的多径延迟。为抵消这种多径延迟引起的ISI(Inter-Symbol Interference,符号间干扰),eMBMS在物理层使用了一种长度为16.6μs的CP(LTE协议中称为Extended Cyclic Prefix,扩展循环前缀)。
但是,上述长度的CP只能抵消较小面积MA内的ISI,对于区级或城市级别的较大面积的MA内的ISI,上述长度的CP并不能抵消,MA边缘的用户将面对比MA中心附近用户严重的ISI,这种情况下,为保证eMBMS的业务覆盖区域,不得不降低MA的MCS(Modulation and Coding Scheme,调制与编码策略)等级,而降低MA的MCS会导致整个MA的数据吞吐率降低。
发明内容
鉴于上述问题,提出了本发明以便提供一种克服上述问题或者至少部分地解决上述问题的基站发射功率调整方法及相关设备。具体方案如下:
一种基站发射功率调整方法,所述方法包括:
确定目标区域的第一半径,所述目标区域为增强型多媒体广播多播业务eMBMS的业务覆盖区域MA中需要调整基站发射功率的区域,所述目标区域 的圆心为所述MA的中心;
确定当前系统循环前缀CP的保护区域的第二半径;
当所述第一半径大于所述第二半径时,将所述目标区域划分为多个子区域;
分别调整所述多个子区域中基站的发射功率。
可选地,所述确定目标区域的第一半径,包括:
获取预设门限值;
确定所述MA中信号路径损耗PL等于所述预设门限值的位置与所述MA的中心的第一距离;
确定所述第一距离为所述目标区域的第一半径。
可选地,所述确定目标区域的第一半径,还包括:
确定所述MA的边缘位置与所述MA的中心的第二距离;
当所述第一距离小于所述第二距离时,确定所述第一距离为所述目标区域的第一半径;
当所述第一距离大于所述第二距离时,确定所述第二距离为所述目标区域的第一半径。
可选地,所述将所述目标区域划分为多个子区域,包括:
根据所述目标区域中包含的物理基站的层数将所述目标区域划分为N个子区域,所述N的值小于或等于所述目标区域中包含的物理基站的层数。
可选地,所述分别调整所述多个子区域中基站的发射功率,包括:
其中,P
i′为第i个子区域中基站调整后的发射功率,i为子区域索引,从所述目标区域的圆心到边缘i的取值依次为0至N-1,P为所述MA中基站原始的发射功率,Δp为期望基站调整发射功率的步进。
一种基站发射功率调整装置,所述装置包括:
第一确定单元,用于确定目标区域的第一半径,所述目标区域为增强型多媒体广播多播业务eMBMS的业务覆盖区域MA中需要调整基站发射功率的区域,所述目标区域的圆心为所述MA的中心;
第二确定单元,用于确定当前系统循环前缀CP的保护区域的第二半径;
分区单元,用于当所述第一半径大于所述第二半径时,将所述目标区域划分为多个子区域;
发射功率调整单元,用于分别调整所述多个子区域中基站的发射功率。
可选地,所述第一确定单元,包括:
获取子单元,用于获取预设门限值;
第一距离确定子单元,用于确定所述MA中信号路径损耗PL等于所述预设门限值的位置与所述MA的中心的第一距离;
第一半径确定子单元,用于确定所述第一距离为所述目标区域的第一半径。
可选地,所述第一确定单元,还包括:
第二距离确定子单元,用于确定所述MA的边缘位置与所述MA的中心的第二距离;
所述第一半径确定子单元,具体用于当所述第一距离小于所述第二距离时,确定所述第一距离为所述目标区域的第一半径;当所述第一距离大于所述第二距离时,确定所述第二距离为所述目标区域的第一半径。
可选地,所述分区单元具体用于:
根据所述目标区域中包含的物理基站的层数将所述目标区域划分为N个子区域,所述N的值小于或等于所述目标区域中包含的物理基站的层数。
可选地,所述发射功率调整单元具体用于:
其中,P
i′为第i个子区域中基站调整后的发射功率,i为子区域索引,从所述目标区域的圆心到边缘i的取值依次为0至N-1,P为所述MA中基站原始的发射功率,Δp为期望基站调整发射功率的步进。
一种基站发射功率调整设备,包括处理器、存储器及存储在存储器上并可在处理器上运行的程序,所述处理器执行程序时实现以下步骤:
确定目标区域的第一半径,所述目标区域为增强型多媒体广播多播业务eMBMS的业务覆盖区域MA中需要调整基站发射功率的区域,所述目标区域 的圆心为所述MA的中心;
确定当前系统循环前缀CP的保护区域的第二半径;
当所述第一半径大于所述第二半径时,将所述目标区域划分为多个子区域;
分别调整所述多个子区域中基站的发射功率。
可选的,所述处理器执行程序时还用于实现以下步骤:
获取预设门限值;
确定所述MA中信号路径损耗PL等于所述预设门限值的位置与所述MA的中心的第一距离;
确定所述第一距离为所述目标区域的第一半径。
可选的,所述处理器执行程序时还用于实现以下步骤:
确定所述MA的边缘位置与所述MA的中心的第二距离;
当所述第一距离小于所述第二距离时,确定所述第一距离为所述目标区域的第一半径;当所述第一距离大于所述第二距离时,确定所述第二距离为所述目标区域的第一半径。
可选的,所述处理器执行程序时具体用于实现以下步骤:
根据所述目标区域中包含的物理基站的层数将所述目标区域划分为N个子区域,所述N的值小于或等于所述目标区域中包含的物理基站的层数。
可选的,所述处理器执行程序时具体用于实现以下步骤:
其中,P
i′为第i个子区域中基站调整后的发射功率,i为子区域索引,从所述目标区域的圆心到边缘i的取值依次为0至N-1,P为所述MA中基站原始的发射功率,Δp为期望基站调整发射功率的步进。
一种存储介质,其上存储有程序,该程序被处理器执行时实现如上所述的基站发射功率调整方法。
一种处理器,所述处理器用于运行程序,其中,所述程序运行时执行如上所述的基站发射功率调整方法。
借由上述技术方案,本发明提供的基站发射功率调整方法及相关设备, 是基于现有eMBMS架构设计,通过全网协同功率控制,在不增加CP的长度,不降低频谱效率、不损失对移动性支持的情况下能够提高系统吞吐率。
上述说明仅是本发明技术方案的概述,为了能够更清楚了解本发明的技术手段,而可依照说明书的内容予以实施,并且为了让本发明的上述和其它目的、特征和优点能够更明显易懂,以下特举本发明的具体实施方式。
通过阅读下文优选实施方式的详细描述,各种其他的优点和益处对于本领域普通技术人员将变得清楚明了。附图仅用于示出优选实施方式的目的,而并不认为是对本发明的限制。而且在整个附图中,用相同的参考符号表示相同的部件。在附图中:
图1为本发明实施例提供的增强型多媒体广播多播业务eMBMS的业务覆盖区域MA示意图;
图2为本发明实施例公开的一种基站发射功率调整方法的流程示意图;
图3为本发明实施例公开的根据目标区域中包含的物理基站的层数将目标区域划分为N个子区域的示意图;
图4为本发明实施例公开的一种基站发射功率调整装置的结构示意图。
下面将参照附图更详细地描述本公开的示例性实施例。虽然附图中显示了本公开的示例性实施例,然而应当理解,可以以各种形式实现本公开而不应被这里阐述的实施例所限制。相反,提供这些实施例是为了能够更透彻地理解本公开,并且能够将本公开的范围完整的传达给本领域的技术人员。
对于区级或城市级别的较大面积的MA内的ISI,现有技术中是通过增加CP的长度抵消的,目前常用的两种增加后的CP的长度为33μs和200μs。
虽然增加CP的长度可以抵消较大较大面积的MA内的ISI,但是,由于CP是原始数据的重复冗余,如果单纯增加冗余长度则会降低有效数据的比例,从而降低了频谱效率,如果要保证较高的频谱效率并增加CP的长度则必须减 小子载波间隔,但是这意味着系统对移动性引起的频偏更加敏感。
为此,本发明提出了一种基站发射功率调整方法,该方法是基于现有eMBMS架构设计,通过全网协同功率控制,在不增加CP的长度,不降低频谱效率、不损失对移动性支持的情况下能够提高系统吞吐率。具体通过如下实施例详细说明。
一个由众多基站组成的具有较大覆盖面积的MA模型,实际中由于地形和覆盖需求等诸多因素,MA的整体轮廓形状可能较为多样,为了便于分析问题,本发明采用与3GPP分析MA和MBSFN信道类似的方法建立一套理想模型:以一个小区为中心,包括其周围众多小区的近似规整圆形的区域作为一个MA,如图1所示。
在MBSFN模式下,参与eMBMS业务的多个基站会发射同步广播多播信号,这些电磁波信号在空间中经过不同路径传播、反射、折射及衍射等效应之后,汇聚到达位于MA中的某个UE的接收天线。也就是说,UE侧接收到的广播多播信号是原始信号的多径延时叠加。本发明中,只以经历了最短传播路径和最长传播路径这两个差别最大的信号做模型。最短传播路径信号一般是距离UE最近的基站发出的,损耗最小功率最大,对UE接收性能贡献最大,称为主径信号;最长路径信号一般是由距离UE最远的基站发出且很有可能经过多重反射的,称为最长径信号。基于以上前提,假设被同一UE接收的最长径信号和主径信号传播路径之间的距离差为ΔD,如果ΔD在当前系统CP的保护范围ΔD_CP之内,那么该UE就不会感受到符号间干扰。
请参阅附图2,图2为本发明实施例公开的一种基站发射功率调整方法的流程示意图,该方法的执行主体为基站的上级设备,例如但不限于网络管理系统,该方法包括以下步骤:
步骤S101:确定目标区域的第一半径。
所述目标区域为增强型多媒体广播多播业务eMBMS的业务覆盖区域MA中需要调整基站发射功率的区域,所述目标区域的圆心为所述MA的中心;
在一种可实施方式中,所述确定目标区域的第一半径,包括:
获取预设门限值;
确定所述MA中信号路径损耗PL等于所述预设门限值的位置与所述MA 的中心的第一距离;
确定所述第一距离为所述目标区域的第一半径(r)。
在一种示例中,取预设门限值Thres=110dB,则找到从MA的中心开始信号路径损耗PL=Thres的第一距离r,将r作为需要进行发射功率调整的区域的半径,此半径对应的圆形区域即为目标区域R。
在又一种可实施方式中,所述确定目标区域的第一半径,包括:
获取预设门限值;
确定所述MA中信号路径损耗PL等于所述预设门限值的位置与所述MA的中心的第一距离;
确定所述MA的边缘位置与所述MA的中心的第二距离;其中,MA的边缘位置即MA最外缘的基站的覆盖边缘位置。
当所述第一距离小于所述第二距离时,确定所述第一距离为所述目标区域的第一半径;
当所述第一距离大于所述第二距离时,确定所述第二距离为所述目标区域的第一半径。
也就是说,当MA的范围小于计算得到的R的范围的时候,取较小的值作为R,即R=min(R,MA)。那么,如果最终需要调整功率的范围以基于路损计算的范围为准的话,半径为从MA中心开始信号路径损耗PL=Thres的距离r;如果最终需要调整功率的范围以MA的范围为准的话,最终的r取值是所述MA的边缘位置与所述MA的中心的第二距离。
在本发明实施例中,Thres的选择要足够大,以保证R之外的信号对MA中心小区内UE的干扰强度可以忽略不计。信号路径损耗PL可以基于但不限于使用如Okumura-Hata或者COST231Hata等路损模型计算,也可采用实地测量方式获得。
步骤S102:确定当前系统循环前缀CP的保护区域的第二半径;
当前系统循环前缀CP即为长度为16.6μs的CP。当前系统循环前缀CP的保护区域是固定的,据此可以确定当前系统循环前缀CP的保护区域的第二半径。
步骤S103:当所述第一半径大于所述第二半径时,将所述目标区域划分 为多个子区域;
[根据细则91更正 24.05.2019]
目标区域划定了可对中心小区造成影响的范围,本发明中需判断目标区域内最大路程差maxΔD是否超出当前系统CP的保护范围ΔD_CP。图3中列举了位于目标区域中心和边缘两个小区,位于中心小区的UE既接收来自本小区的多播广播信号,同时也接收远端小区的多播广播信号,本发明中,将目标区域内可能出现的最长路程差maxΔD近似等于目标区域的第一半径,虽然这个近似误差很大,但是却相当于预留了更多的保护余量,因为第一半径其实是远端小区主径和近端小区主径之间的路程差,这个值必定小于远端小区信号延迟路径与近端小区主路径路程之差,所以如果第一半径超出了ΔD_CP,那么最长路程差也一定超出了ΔD_CP。
目标区域划定了可对中心小区造成影响的范围,本发明中需判断目标区域内最大路程差maxΔD是否超出当前系统CP的保护范围ΔD_CP。图3中列举了位于目标区域中心和边缘两个小区,位于中心小区的UE既接收来自本小区的多播广播信号,同时也接收远端小区的多播广播信号,本发明中,将目标区域内可能出现的最长路程差maxΔD近似等于目标区域的第一半径,虽然这个近似误差很大,但是却相当于预留了更多的保护余量,因为第一半径其实是远端小区主径和近端小区主径之间的路程差,这个值必定小于远端小区信号延迟路径与近端小区主路径路程之差,所以如果第一半径超出了ΔD_CP,那么最长路程差也一定超出了ΔD_CP。
因此,本发明中,根据ΔD_CP的第二半径与第一半径的关系判断是否需要分区,若第一半径大于第二半径,则说明当前系统CP无法保护最大路径差,需要分区,若第一半径小于等于第二半径,则说明当前系统CP可以保护最大路径差,无需分区。
在一种可实施方式中,根据所述目标区域中包含的物理基站的层数将所述目标区域划分为N个子区域,所述N的值小于或等于所述目标区域中包含的物理基站的层数。如图3所示。
步骤S104:分别调整所述多个子区域中基站的发射功率。
其中,P
i′为第i个子区域中基站调整后的发射功率,i为子区域索引,从所述目标区域的圆心到边缘i的取值依次为0至N-1,P为所述MA中基站原始的发射功率,Δp为期望基站调整发射功率的步进。
[根据细则91更正 24.05.2019]
请参阅附图4,图4为本发明实施例公开的一种基站发射功率调整装置的结构示意图,该装置包括:
请参阅附图4,图4为本发明实施例公开的一种基站发射功率调整装置的结构示意图,该装置包括:
第一确定单元51,用于确定目标区域的第一半径,所述目标区域为增强型多媒体广播多播业务eMBMS的业务覆盖区域MA中需要调整基站发射功率的区域,所述目标区域的圆心为所述MA的中心;
第二确定单元52,用于确定当前系统循环前缀CP的保护区域的第二半径;
分区单元53,用于当所述第一半径大于所述第二半径时,将所述目标区域划分为多个子区域;
发射功率调整单元54,用于分别调整所述多个子区域中基站的发射功率。
可选地,所述第一确定单元,包括:
获取子单元,用于获取预设门限值;
第一距离确定子单元,用于确定所述MA中信号路径损耗PL等于所述预设门限值的位置与所述MA的中心的第一距离;
第一半径确定子单元,用于确定所述第一距离为所述目标区域的第一半径。
可选地,所述第一确定单元,还包括:
第二距离确定子单元,用于确定所述MA的边缘位置与所述MA的中心的第二距离;
所述第一半径确定子单元,具体用于当所述第一距离小于所述第二距离时,确定所述第一距离为所述目标区域的第一半径;当所述第一距离大于所述第二距离时,确定所述第二距离为所述目标区域的第一半径。
可选地,所述分区单元具体用于:
根据所述目标区域中包含的物理基站的层数将所述目标区域划分为N个子区域,所述N的值小于或等于所述目标区域中包含的物理基站的层数。
可选地,所述发射功率调整单元具体用于:
其中,P
i′为第i个子区域中基站调整后的发射功率,i为子区域索引,从所述目标区域的圆心到边缘i的取值依次为0至N-1,P为所述MA中基站原始的发射功率,Δp为期望基站调整发射功率的步进。
需要说明的是,上述各个单元的具体功能实现已在方法实施例中详细说明,本实施例不再赘述。
所述基站发射功率调整装置包括处理器和存储器,上述各个单元存储在存储器中,由处理器执行存储在存储器中的上述程序单元来实现相应的功能。
处理器中包含内核,由内核去存储器中调取相应的程序单元。内核可以设置一个或以上,通过调整内核参数来基于现有eMBMS架构设计,通过全网协同功率控制,在不增加CP的长度,不降低频谱效率、不损失对移动性支持的情况下能够提高系统吞吐率。
存储器可能包括计算机可读介质中的非永久性存储器,随机存取存储器(RAM)和/或非易失性内存等形式,如只读存储器(ROM)或闪存(flash RAM),存储器包括至少一个存储芯片。
本发明实施例提供了一种存储介质,其上存储有程序,该程序被处理器执行时实现所述基站发射功率调整方法。
本发明实施例提供了一种处理器,所述处理器用于运行程序,其中,所述程序运行时执行所述基站发射功率调整方法。
本发明实施例提供了一种基站发射功率调整设备,设备包括处理器、存储器及存储在存储器上并可在处理器上运行的程序,处理器执行程序时实现以下步骤:
确定目标区域的第一半径,所述目标区域为增强型多媒体广播多播业务eMBMS的业务覆盖区域MA中需要调整基站发射功率的区域,所述目标区域的圆心为所述MA的中心;
确定当前系统循环前缀CP的保护区域的第二半径;
当所述第一半径大于所述第二半径时,将所述目标区域划分为多个子区域;
分别调整所述多个子区域中基站的发射功率。
可选的,所述处理器执行程序时还用于实现以下步骤:
获取预设门限值;
确定所述MA中信号路径损耗PL等于所述预设门限值的位置与所述MA的中心的第一距离;
确定所述第一距离为所述目标区域的第一半径。
可选的,所述处理器执行程序时还用于实现以下步骤:
确定所述MA的边缘位置与所述MA的中心的第二距离;
当所述第一距离小于所述第二距离时,确定所述第一距离为所述目标区域 的第一半径;当所述第一距离大于所述第二距离时,确定所述第二距离为所述目标区域的第一半径。
可选的,所述处理器执行程序时具体用于实现以下步骤:
根据所述目标区域中包含的物理基站的层数将所述目标区域划分为N个子区域,所述N的值小于或等于所述目标区域中包含的物理基站的层数。
可选的,所述处理器执行程序时具体用于实现以下步骤:
其中,P
i′为第i个子区域中基站调整后的发射功率,i为子区域索引,从所述目标区域的圆心到边缘i的取值依次为0至N-1,P为所述MA中基站原始的发射功率,Δp为期望基站调整发射功率的步进。
本领域内的技术人员应明白,本申请的实施例可提供为方法、系统、或计算机程序产品。因此,本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且,本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本申请是参照根据本申请实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器,使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中,使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品,该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上,使 得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理,从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
在一个典型的配置中,计算设备包括一个或多个处理器(CPU)、输入/输出接口、网络接口和内存。
存储器可能包括计算机可读介质中的非永久性存储器,随机存取存储器(RAM)和/或非易失性内存等形式,如只读存储器(ROM)或闪存(flash RAM)。存储器是计算机可读介质的示例。
计算机可读介质包括永久性和非永久性、可移动和非可移动媒体可以由任何方法或技术来实现信息存储。信息可以是计算机可读指令、数据结构、程序的模块或其他数据。计算机的存储介质的例子包括,但不限于相变内存(PRAM)、静态随机存取存储器(SRAM)、动态随机存取存储器(DRAM)、其他类型的随机存取存储器(RAM)、只读存储器(ROM)、电可擦除可编程只读存储器(EEPROM)、快闪记忆体或其他内存技术、只读光盘只读存储器(CD-ROM)、数字多功能光盘(DVD)或其他光学存储、磁盒式磁带,磁带磁磁盘存储或其他磁性存储设备或任何其他非传输介质,可用于存储可以被计算设备访问的信息。按照本文中的界定,计算机可读介质不包括暂存电脑可读媒体(transitory media),如调制的数据信号和载波。
还需要说明的是,术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含,从而使得包括一系列要素的过程、方法、商品或者设备不仅包括那些要素,而且还包括没有明确列出的其他要素,或者是还包括为这种过程、方法、商品或者设备所固有的要素。在没有更多限制的情况下,由语句“包括一个……”限定的要素,并不排除在包括要素的过程、方法、商品或者设备中还存在另外的相同要素。
本领域技术人员应明白,本申请的实施例可提供为方法、系统或计算机程序产品。因此,本申请可采用完全硬件实施例、完全软件实施例或结合软件和硬件方面的实施例的形式。而且,本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、 光学存储器等)上实施的计算机程序产品的形式。
以上仅为本申请的实施例而已,并不用于限制本申请。对于本领域技术人员来说,本申请可以有各种更改和变化。凡在本申请的精神和原理之内所作的任何修改、等同替换、改进等,均应包含在本申请的权利要求范围之内。
Claims (17)
- 一种基站发射功率调整方法,其特征在于,所述方法包括:确定目标区域的第一半径,所述目标区域为增强型多媒体广播多播业务eMBMS的业务覆盖区域MA中需要调整基站发射功率的区域,所述目标区域的圆心为所述MA的中心;确定当前系统循环前缀CP的保护区域的第二半径;当所述第一半径大于所述第二半径时,将所述目标区域划分为多个子区域;分别调整所述多个子区域中基站的发射功率。
- 根据权利要求1所述的方法,其特征在于,所述确定目标区域的第一半径,包括:获取预设门限值;确定所述MA中信号路径损耗PL等于所述预设门限值的位置与所述MA的中心的第一距离;确定所述第一距离为所述目标区域的第一半径。
- 根据权利要求2所述的方法,其特征在于,所述确定目标区域的第一半径,还包括:确定所述MA的边缘位置与所述MA的中心的第二距离;当所述第一距离小于所述第二距离时,确定所述第一距离为所述目标区域的第一半径;当所述第一距离大于所述第二距离时,确定所述第二距离为所述目标区域的第一半径。
- 根据权利要求1至3中任意一项所述的方法,其特征在于,所述将所述目标区域划分为多个子区域,包括:根据所述目标区域中包含的物理基站的层数将所述目标区域划分为N个子区域,所述N的值小于或等于所述目标区域中包含的物理基站的层数。
- 一种基站发射功率调整装置,其特征在于,所述装置包括:第一确定单元,用于确定目标区域的第一半径,所述目标区域为增强型多媒体广播多播业务eMBMS的业务覆盖区域MA中需要调整基站发射功率的区域,所述目标区域的圆心为所述MA的中心;第二确定单元,用于确定当前系统循环前缀CP的保护区域的第二半径;分区单元,用于当所述第一半径大于所述第二半径时,将所述目标区域划分为多个子区域;发射功率调整单元,用于分别调整所述多个子区域中基站的发射功率。
- 根据权利要求6所述的装置,其特征在于,所述第一确定单元,包括:获取子单元,用于获取预设门限值;第一距离确定子单元,用于确定所述MA中信号路径损耗PL等于所述预设门限值的位置与所述MA的中心的第一距离;第一半径确定子单元,用于确定所述第一距离为所述目标区域的第一半径。
- 根据权利要求7所述的装置,其特征在于,所述第一确定单元,还包括:第二距离确定子单元,用于确定所述MA的边缘位置与所述MA的中心的第二距离;所述第一半径确定子单元,具体用于当所述第一距离小于所述第二距离时,确定所述第一距离为所述目标区域的第一半径;当所述第一距离大于所述第二距离时,确定所述第二距离为所述目标区域的第一半径。
- 根据权利要求6至8中任意一项所述的装置,其特征在于,所述分区单元具体用于:根据所述目标区域中包含的物理基站的层数将所述目标区域划分为N个 子区域,所述N的值小于或等于所述目标区域中包含的物理基站的层数。
- 一种基站发射功率调整设备,其特征在于,所述设备包括处理器、存储器及存储在存储器上并可在处理器上运行的程序,所述处理器执行程序时实现以下步骤:确定目标区域的第一半径,所述目标区域为增强型多媒体广播多播业务eMBMS的业务覆盖区域MA中需要调整基站发射功率的区域,所述目标区域的圆心为所述MA的中心;确定当前系统循环前缀CP的保护区域的第二半径;当所述第一半径大于所述第二半径时,将所述目标区域划分为多个子区域;分别调整所述多个子区域中基站的发射功率。
- 根据权利要求11所述的设备,其特征在于,所述处理器执行程序时还用于实现以下步骤:获取预设门限值;确定所述MA中信号路径损耗PL等于所述预设门限值的位置与所述MA的中心的第一距离;确定所述第一距离为所述目标区域的第一半径。
- 根据权利要求12所述的设备,其特征在于,所述处理器执行程序时还用于实现以下步骤:确定所述MA的边缘位置与所述MA的中心的第二距离;当所述第一距离小于所述第二距离时,确定所述第一距离为所述目标区域的第一半径;当所述第一距离大于所述第二距离时,确定所述第二距离为所述 目标区域的第一半径。
- 根据权利要求11至13中任意一项所述的设备,其特征在于,所述处理器执行程序时具体用于实现以下步骤:根据所述目标区域中包含的物理基站的层数将所述目标区域划分为N个子区域,所述N的值小于或等于所述目标区域中包含的物理基站的层数。
- 一种存储介质,其上存储有程序,该程序被处理器执行时实现如权利要求1至5中任一项所述的基站发射功率调整方法。
- 一种处理器,所述处理器用于运行程序,其中,所述程序运行时执行如权利要求1至5中任一项所述的基站发射功率调整方法。
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