CN104812042A - Method for controlling transmission power - Google Patents
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- CN104812042A CN104812042A CN201410041266.0A CN201410041266A CN104812042A CN 104812042 A CN104812042 A CN 104812042A CN 201410041266 A CN201410041266 A CN 201410041266A CN 104812042 A CN104812042 A CN 104812042A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
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- H04W52/14—Separate analysis of uplink or downlink
- H04W52/146—Uplink power control
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- H—ELECTRICITY
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- 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
- H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
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Abstract
本发明公开了一种对传输功率实施控制的方法。该方法适用于D2D传输和上行传输共同频分复用上行资源的情况。在基站侧的方法包括:A.为D2D用户端和上行用户端配置功率控制参数;B.把所述配置后的功率控制参数通过系统信息或者配置信息广播至无线网络中;C.测量所述D2D用户端发送的传输信号对所述上行用户端的上传信号的干扰程度;D.根据所述干扰程度的测量结果,调整部分所述功率控制参数;E.把所述调整后的功率控制参数通过系统信息或者配置信息广播至所述无线网络中。本发明还公开了D2D用户端和上行用户端所实施的对应的方法。
The invention discloses a method for controlling transmission power. This method is applicable to the case where D2D transmission and uplink transmission share frequency division multiplexing uplink resources. The method on the base station side includes: A. Configuring power control parameters for the D2D user end and the uplink user end; B. Broadcasting the configured power control parameters to the wireless network through system information or configuration information; C. Measuring the The interference degree of the transmission signal sent by the D2D user end to the upload signal of the uplink user end; D. According to the measurement result of the interference degree, adjust part of the power control parameters; E. Pass the adjusted power control parameters through System information or configuration information is broadcast to the wireless network. The invention also discloses corresponding methods implemented by the D2D user end and the uplink user end.
Description
技术领域technical field
本发明主要涉及无线通信技术领域,特别的,涉及一种对无线网络中用户端的传输功率实施控制的方法。The present invention mainly relates to the technical field of wireless communication, and in particular, relates to a method for controlling the transmission power of a user end in a wireless network.
背景技术Background technique
在3GPP D2D(设备至设备:device to device)的讨论中(例如,在R12中的研究项目),已经同意D2D传输可以在上行载波(在频分复用FDD模式中)或上行子帧(在时分复用TDD模式中)中占用可配置的时间周期和频率资源。这就意味着:和通常的蜂窝网络一样,在D2D传输(例如D2D发现)中,下行载波或子帧仍然被使用于下行数据的传输。在这种情况下,会不可避免的出现一个问题:在激活的D2D传输持续处于所配置的D2D传输时序期间(此处假设频分复用是不失普遍性的),一些上行控制信息仍然需要被传输(例如,下行数据包的ACK/NACK反馈)。因此,在D2D的子帧中,一些蜂窝信道(例如,PUCCHs)的传输将必须与D2D的传输进行频分复用,以共享无线网络中的上行频率资源。在此情况下,可以自然想象这么一个技术问题:D2D传输会对基站侧接收PUCCH中的信息产生不良影响吗?如果会,如何避免该潜在的不良影响?In the discussion of 3GPP D2D (device to device: device to device) (for example, the research project in R12), it has been agreed that D2D transmission can be carried out on the uplink carrier (in frequency division multiplexing FDD mode) or in the uplink subframe (in In time division multiplexing TDD mode), configurable time period and frequency resources are occupied. This means that, like a common cellular network, in D2D transmission (such as D2D discovery), downlink carriers or subframes are still used for downlink data transmission. In this case, there will inevitably be a problem: during the activated D2D transmission continues to be in the configured D2D transmission timing (here it is assumed that frequency division multiplexing is universal), some uplink control information still needs to be transmitted (for example, ACK/NACK feedback of downlink data packets). Therefore, in a D2D subframe, the transmission of some cellular channels (eg, PUCCHs) will have to be frequency-division multiplexed with the D2D transmission to share uplink frequency resources in the wireless network. In this case, it is natural to imagine such a technical problem: Will the D2D transmission have adverse effects on the information in the PUCCH received by the base station? If so, how can this potential adverse effect be avoided?
实际上,尽管D2D传输所用的资源和PUCCH传输所使用的资源是相互正交的频率资源,但是D2D传输确实会对频分复用的PUCCH传输产生潜在的影响。该潜在的影响源于来自D2D传输的带内发射干扰(in-band emission interference)。图1中显示了3GPPTR36.843v1.0中定义的带内发射干扰的示例模型。在5号物理资源块的信号会对其他物理资源块的信号造成一般的带内发射干扰(例如,对5-10号物理资源块的干扰)、载波泄露形成的带内发射干扰(例如,对25号物理资源块的干扰)和IQ镜像形成的带内发射干扰(例如,对46号物理资源块的干扰)。因此,我们可以容易的想象到,D2D传输,特别是基站附近的D2D传输,会对PUCCH所占有的资源产生显著的带内干扰。图2显示了一个“带内干扰与热噪声之比”(IBIoT:in-band interference over thermal noise)的系统级评估结果,其中,产生该带内干扰的D2D发现发射机使用固定的23dBm的传输功率。从该图中,我们可以发现该带内干扰与热噪声之比可以平均高达40dB以上,这完全淹没了基站接收机侧的有用的PUCCH信号。所以急需找到一个技术方案解决此问题,而这恰恰就是本发明所要解决的技术问题。In fact, although the resources used for D2D transmission and the resources used for PUCCH transmission are mutually orthogonal frequency resources, D2D transmission does have a potential impact on frequency division multiplexed PUCCH transmission. This potential impact stems from in-band emission interference from D2D transmissions. An example model of in-band emission interference defined in 3GPP TR36.843v1.0 is shown in Figure 1. The signal in the physical resource block No. 5 will cause general in-band transmission interference (for example, interference to physical resource blocks No. Interference to physical resource block No. 25) and in-band transmission interference formed by IQ mirroring (for example, interference to physical resource block No. 46). Therefore, we can easily imagine that the D2D transmission, especially the D2D transmission near the base station, will cause significant in-band interference to the resources occupied by the PUCCH. Figure 2 shows a system-level evaluation result of "in-band interference over thermal noise" (IBIoT: in-band interference over thermal noise), where the D2D discovery transmitter that generates the in-band interference uses a fixed 23dBm transmission power. From the figure, we can find that the ratio of in-band interference to thermal noise can be as high as above 40dB on average, which completely submerges the useful PUCCH signal at the receiver side of the base station. So be badly in need of finding a technical solution to solve this problem, and this just is the technical problem to be solved by the present invention.
发明内容Contents of the invention
为了解决上述技术问题,根据本发明的一个方面公开了一种在基站侧对D2D用户端的传输功率PD2D实施控制的方法,所述D2D用户端位于所述基站的覆盖范围内,所述D2D用户端与其他需要向所述基站发送上行信息的上行用户端通过频分复用的方式共同使用无线网络中的上行频率资源,其中:A.为所述D2D用户端和所述上行用户端配置功率控制参数;B.把所述配置后的功率控制参数通过系统信息或者配置信息广播至所述无线网络中;C.测量所述D2D用户端发送的传输信号对所述上行用户端的上传信号的干扰程度;D.根据所述干扰程度的测量结果,调整部分所述功率控制参数;E.把所述调整后的功率控制参数通过系统信息或者配置信息广播至所述无线网络中。In order to solve the above technical problems, according to one aspect of the present invention, a method for controlling the transmission power P D2D of a D2D user terminal at the base station side is disclosed, the D2D user terminal is located within the coverage of the base station, and the D2D user terminal The terminal and other uplink user terminals that need to send uplink information to the base station share the uplink frequency resources in the wireless network by means of frequency division multiplexing, wherein: A. configure power for the D2D user terminal and the uplink user terminal Control parameters; B. Broadcast the configured power control parameters to the wireless network through system information or configuration information; C. Measure the interference of the transmission signal sent by the D2D user end on the upload signal of the uplink user end D. Adjust part of the power control parameters according to the measurement result of the interference degree; E. Broadcast the adjusted power control parameters to the wireless network through system information or configuration information.
特别的,所述功率控制参数包括:为所述D2D用户端和上行用户端配置的载波最大传输功率参数PCMAX,C;为所述上行用户端配置的公共PUCCH功率控制参数PO_Norminal_PUCCH;为所述D2D用户端配置的D2D特定功率控制参数ΔD2D。Specifically, the power control parameters include: the carrier maximum transmission power parameter P CMAX,C configured for the D2D user end and the uplink user end; the common PUCCH power control parameter P O_Norminal_PUCCH configured for the uplink user end; D2D specific power control parameter Δ D2D configured by the D2D UE.
特别的,在所述步骤D中,当所述干扰程度的测量结果超过预定的限度范围时,减小所述D2D特定功率控制参数ΔD2D的值;当所述干扰程度的测量结果低于所述预定的限度范围时,增加所述D2D特定功率控制参数ΔD2D的值;当所述干扰程度的测量结果处于所述预定的限度范围内时,保持所述D2D特定功率控制参数ΔD2D的值。Specifically, in the step D, when the measurement result of the interference degree exceeds a predetermined limit range, reduce the value of the D2D specific power control parameter ΔD2D ; when the measurement result of the interference degree is lower than the predetermined When the predetermined limit range, increase the value of the D2D specific power control parameter Δ D2D ; when the measurement result of the interference degree is within the predetermined limit range, maintain the value of the D2D specific power control parameter Δ D2D .
特别的,在所述步骤A中还包括,a1.预设信噪比阈值γPUCCH,其表示在所述基站侧,所述上行用户端的上传信号与带内干扰的比值的临界值,其中,所述带内干扰是:所述D2D用户端发送的传输信号对上行用户端的上传信号的干扰;a2.根据所述信噪比阈值γPUCCH配置所述D2D特定功率控制参数ΔD2D。In particular, step A also includes, a1. a preset signal-to-noise ratio threshold γ PUCCH , which represents the critical value of the ratio of the uplink user terminal's upload signal to in-band interference at the base station side, wherein, The in-band interference is: the interference of the transmission signal sent by the D2D user end on the uplink signal of the uplink user end; a2. The D2D specific power control parameter Δ D2D is configured according to the signal-to-noise ratio threshold γ PUCCH .
特别的,在所述步骤a2中:根据方程PO_Norminal_PUCCH-(PO_Norminal_PUCCH+ΔD2D+10log10(NPRB_D2D)-36)>γPUCCH,配置所述D2D特定功率控制参数ΔD2D的值,其中,所述NPRB_D2D为D2D用户端所在频域所使用的物理资源块的数量。Specifically, in the step a2: according to the equation P O_Norminal_PUCCH -(P O_Norminal_PUCCH +Δ D2D +10log 10 (N PRB_D2D )-36)>γ PUCCH , configure the value of the D2D specific power control parameter Δ D2D , wherein, The N PRB_D2D is the number of physical resource blocks used by the D2D UE in the frequency domain.
特别的,在所述步骤A中,所述D2D特定功率控制参数ΔD2D为根据所述无线网络的传输状况所预设的值。Particularly, in the step A, the D2D specific power control parameter ΔD2D is a preset value according to the transmission status of the wireless network.
特别的,在所述步骤D中,当所述干扰程度的测量结果超过预定的限度范围时,为所述上行用户端配置专用PUCCH功率控制参数PO-UE-PUCCH,通过所述专用的PUCCH功率控制参数PO_UE_PUCCH来提升所述上行用户端的发送功率。Specifically, in the step D, when the measurement result of the degree of interference exceeds a predetermined limit range, a dedicated PUCCH power control parameter P O-UE-PUCCH is configured for the uplink UE, and the dedicated PUCCH The power control parameter P O_UE_PUCCH is used to increase the transmit power of the uplink UE.
特别的,还包括:配置所述传输功率PD2D的量化集合,并把所述量化集合广播至所述无线网络中,所述量化集合中的元素与所述传输功率PD2D的对应关系为:In particular, it also includes: configuring the quantization set of the transmission power P D2D , and broadcasting the quantization set to the wireless network, and the elements in the quantization set The corresponding relationship with the transmission power P D2D is:
其中,{P0,P1,...,PM-1}为所述传输功率PD2D的量化集合,M为量化集合中元素的个数。Wherein, {P 0 , P 1 , ..., P M-1 } is the quantization set of the transmission power P D2D , and M is the number of elements in the quantization set.
特别的,在所述步骤A中,还包括配置限定的D2D传输资源集合,所述限定的D2D传输资源集合由限定的D2D传输资源组成,其中,在频域中,所述限定的D2D传输资源距离所述上行用户端发送上行信息所用的传输资源相对较远;在所述步骤B中,还包括把所述限定的D2D传输资源集合通过系统信息或者配置信息广播至所述无线网络中。Specifically, in the step A, it also includes configuring a limited set of D2D transmission resources, the limited set of D2D transmission resources is composed of limited D2D transmission resources, wherein, in the frequency domain, the limited D2D transmission resources It is relatively far away from the transmission resources used by the uplink UE to send uplink information; in the step B, it also includes broadcasting the limited set of D2D transmission resources to the wireless network through system information or configuration information.
根据本发明的的另一方面公开了一种在D2D用户侧对D2D用户端的传输功率PD2D实施控制的方法,所述D2D用户端位于基站的覆盖范围内,所述D2D用户端与其他需要向所述基站发送上行信息的上行用户端通过频分复用的方式共同使用无线网络中的上行频率资源,其中:周期性地接收由所述基站广播的系统信息或者配置信息,并从中获取功率控制参数;测量来自所述基站的路径损耗PL;根据所述功率控制参数和所述路径损耗确定所述D2D用户端的传输功率PD2D。According to another aspect of the present invention, a method for controlling the transmission power P D2D of a D2D user terminal on the D2D user side is disclosed. The D2D user terminal is located within the coverage of the base station. The uplink user terminal that the base station sends the uplink information jointly uses the uplink frequency resources in the wireless network by means of frequency division multiplexing, wherein: periodically receives the system information or configuration information broadcast by the base station, and obtains power control information therefrom parameter; measure the path loss PL from the base station; determine the transmission power P D2D of the D2D UE according to the power control parameter and the path loss.
特别的,所述功率控制参数包括:为所述D2D用户端和上行用户端配置的载波最大传输功率参数PCMAX,C;为所述上行用户端配置的公共PUCCH功率控制参数PO_Norminal_PUCCH;为所述D2D用户端配置的D2D特定功率控制参数ΔD2D。Specifically, the power control parameters include: the carrier maximum transmission power parameter P CMAX,C configured for the D2D user end and the uplink user end; the common PUCCH power control parameter P O_Norminal_PUCCH configured for the uplink user end; D2D specific power control parameter Δ D2D configured by the D2D UE.
特别的,根据公式:PD2D=min{PCMAX,c,PO_Nonninal_PUCCH+PL+ΔD2D}来确定所述D2D用户端的传输功率PD2D。Specifically, the transmission power P D2D of the D2D UE is determined according to the formula: P D2D =min{P CMAX, c, P O_Nonninal_ P UCCH +PL+Δ D2D }.
特别的,还包括:接收所述基站发送的量化集合{P0,P1,...,PM-1},根据公式:
特别的,还包括:接收由所述基站广播的系统信息或者配置信息,并从中获取限定的D2D传输资源集合;当所述D2D用户端的传输功率PD2D小于所述量化集合中的最小量化功率P0时,使用所述限定的D2D传输资源集合中的限定的D2D资源作为D2D传输的传输资源;其中,在频域中,所述限定的D2D传输资源距离所述上行用户端发送上行信息所用的传输资源相对较远。In particular, it also includes: receiving system information or configuration information broadcast by the base station, and obtaining a limited set of D2D transmission resources therefrom; When 0 , use the limited D2D resources in the limited set of D2D transmission resources as the transmission resources for D2D transmission; wherein, in the frequency domain, the limited D2D transmission resources are farther from the distance used by the uplink UE to send uplink information Transmission resources are relatively far away.
根据本发明的另一方面公开了一种在上行用户侧对上行用户端的传输功率实施控制的方法,所述上行用户端为需要向基站发送上行信息的用户端,D2D用户端位于所述基站的覆盖范围内,所述D2D用户端与所述上行用户端通过频分复用的方式共同使用无线网络中的上行频率资源,其中:周期性地接收由所述基站广播的系统信息或者配置信息,并从中获取功率控制参数;根据所述功率控制参数中的公共PUCCH功率控制参数PO_Norminal_PUCCH确定所述上行用户端的传输功率;其中,当从所述上行用户端的下行信道中的RRC信令中获取到专用PUCCH功率控制参数PO-UE-PUCCH时;根据所述公共PUCCH功率控制参数PO_Norminal_PUCCH及所述专用PUCCH功率控制参数PO-UE-PUCCH确定所述上行用户端的传输功率。According to another aspect of the present invention, a method for controlling the transmission power of an uplink user terminal on the uplink user side is disclosed. The uplink user terminal is a user terminal that needs to send uplink information to a base station, and the D2D user terminal is located at the base station. Within the coverage area, the D2D user end and the uplink user end jointly use uplink frequency resources in the wireless network through frequency division multiplexing, wherein: periodically receive system information or configuration information broadcast by the base station, and obtain power control parameters therefrom; determine the transmission power of the uplink user terminal according to the public PUCCH power control parameter P O_Norminal_PUCCH in the power control parameters; wherein, when the RRC signaling in the downlink channel of the uplink user terminal is obtained Dedicated PUCCH power control parameter P O-UE-PUCCH ; determine the transmission power of the uplink user terminal according to the common PUCCH power control parameter P O_Norminal_PUCCH and the dedicated PUCCH power control parameter P O-UE-PUCCH .
本发明所公开的方案具有如下优点:在无线网络实施D2D传输应用时,可以避免D2D传输对于上行传输中PUCCH信道的干扰,克服了现有技术中由于D2D传输使用固定的传输功率而对上行用户的上行传输造成的带内发射干扰,改善了PUCCH信道的信噪比,并且提高了传输功率的使用效率。The solution disclosed in the present invention has the following advantages: when the wireless network implements the D2D transmission application, it can avoid the interference of the D2D transmission on the PUCCH channel in the uplink transmission, and overcome the problem of the D2D transmission using fixed transmission power in the prior art. The in-band transmission interference caused by the uplink transmission improves the signal-to-noise ratio of the PUCCH channel and improves the use efficiency of transmission power.
附图说明Description of drawings
通过下文对结合附图所示出的实施例进行详细说明,本发明的上述以及其他特征将更加明显,本发明附图中相同或相似的标号表示相同或相似的步骤;Through the following detailed description of the embodiments shown in conjunction with the drawings, the above-mentioned and other features of the present invention will be more obvious, and the same or similar symbols in the drawings of the present invention represent the same or similar steps;
图1示出了一个3GPP TR36.843v1.0中定义的带内发射干扰的示例模型图;Figure 1 shows an example model diagram of in-band emission interference defined in 3GPP TR36.843v1.0;
图2示出了一个在PUCCH物理资源块上的“带内干扰与热噪声之比”(IBIoT:in-band interference over thermal noise)的系统级评估结果;Figure 2 shows a system-level evaluation result of "in-band interference over thermal noise ratio" (IBIoT: in-band interference over thermal noise) on the PUCCH physical resource block;
图3示出了根据本发明所公开的一种在基站侧对D2D用户端的传输功率PD2D实施控制的方法流程图;Fig. 3 shows a flow chart of a method for controlling the transmission power PD2D of a D2D user terminal at the base station side disclosed in the present invention;
图4示出了根据本发明所公开的一种在D2D用户侧对传输功率PD2D实施控制的方法流程图;Fig. 4 shows a flow chart of a method for controlling transmission power P D2D at the D2D user side according to the present invention;
图5示出了根据本发明所公开的一种在Uplink用户侧对Uplink用户端的传输功率实施控制的方法流程图;FIG. 5 shows a flow chart of a method for controlling the transmission power of an Uplink user terminal at the Uplink user side according to the present invention;
图6示出了在基站侧接收到的PUCCH信号上的信号与干扰加噪声比(SINR)的累积分布函数(CDF)示意图;6 shows a schematic diagram of the cumulative distribution function (CDF) of the signal-to-interference-plus-noise ratio (SINR) on the PUCCH signal received at the base station side;
图7示出了具有功率控制和不具有功率控制的D2D传输功率的累积分布函数(CDF)示意图;以及Figure 7 shows a schematic diagram of the cumulative distribution function (CDF) of D2D transmission power with and without power control; and
图8示出了使用功率控制和未使用功率控制时,D2D接收机上的信号与干扰加噪声比(S1NR)的累积分布函数(CDF)示意图。Fig. 8 shows a schematic diagram of the cumulative distribution function (CDF) of the signal-to-interference-plus-noise ratio (S1NR) on the D2D receiver with and without power control.
具体实施方式Detailed ways
在以下优选的实施例的具体描述中,将参考构成本发明一部分的所附的附图。所附的附图通过示例的方式示出了能够实现本发明的特定的实施例。示例的实施例并不旨在穷尽根据本发明的所有实施例。需要说明的是,尽管本文中以特定顺序描述了本发明中有关方法的步骤,但是这并非要求或者暗示必须按照该特定顺序来执行这些操作,或是必须执行全部所示的操作才能实现期望的结果,相反,本文中所描述的步骤可以改变执行顺序。附加地或备选地,可以省略某些步骤,将多个步骤合并为一个步骤执行,和/或将一个步骤分解为多个步骤执行。In the following detailed description of the preferred embodiment, reference is made to the accompanying drawings which form a part hereof. The accompanying drawings show, by way of example, specific embodiments in which the invention can be practiced. The illustrated embodiments are not intended to be exhaustive of all embodiments in accordance with the invention. It should be noted that although the steps of the relevant methods in the present invention are described in a specific order herein, this does not require or imply that these operations must be performed in this specific order, or that all shown operations must be performed to achieve the desired As a result, instead, the steps described herein may be performed in a different order. Additionally or alternatively, certain steps may be omitted, multiple steps may be combined into one step for execution, and/or one step may be decomposed into multiple steps for execution.
在本文的介绍中,为了便于说明,对于使用D2D方式传输数据的用户端,我们称之为D2D用户端;对于在无线网络中向所对应的基站发送上行数据(例如PUCCH)的用户端,我们称之为上行用户端。In the introduction of this article, for the convenience of explanation, for the user end that transmits data in D2D mode, we call it D2D user end; for the user end that sends uplink data (such as PUCCH) to the corresponding base station in the wireless network, we call it It is called the uplink client.
需要指出的是本发明中的D2D用户端和上行用户端位于相同的基站覆盖范围内,该D2D用户端和上行用户端通过频分复用的方式共同使用无线网络中的上行频率资源。即,本发明所公开的方法适用于D2D传输和上行传输共同频分复用上行资源的情况。It should be pointed out that the D2D UE and the uplink UE in the present invention are located in the same coverage area of the base station, and the D2D UE and the uplink UE jointly use the uplink frequency resources in the wireless network by means of frequency division multiplexing. That is, the method disclosed in the present invention is applicable to the case where D2D transmission and uplink transmission share frequency division multiplexing uplink resources.
在3GPP D2D研究中,假设D2D用户端使用固定的发射功率(例如23dBm)。在该固定的传输功率配置下,接近于基站的用户端会对基站接收上行用户端的上行数据(如PUCCH中的数据)形成很高的带内干扰(如图2所示)。为了减轻D2D传输对于基站接收上行数据的影响,本发明把D2D传输功率配置成开环功率控制的方式,以取代原有的固定传输功率的方式。In the 3GPP D2D research, it is assumed that the D2D UE uses a fixed transmit power (for example, 23dBm). Under the fixed transmission power configuration, the UE close to the base station will cause high in-band interference (as shown in FIG. 2 ) to the uplink data (such as data in the PUCCH) received by the base station from the uplink UE. In order to reduce the impact of D2D transmission on the uplink data received by the base station, the present invention configures the D2D transmission power in an open-loop power control mode to replace the original fixed transmission power mode.
图3示出了根据本发明所公开的一种在基站侧对D2D用户端的传输功率PD2D实施控制的方法的流程图,该方法减缓了D2D用户端之间的传输信号对于上行用户端的上传传输信号的干扰。其中,该D2D用户端和上行用户端位于该基站的信号覆盖范围内。Fig. 3 shows a flow chart of a method for controlling the transmission power P D2D of a D2D user terminal at the base station side according to the present invention, the method slows down the uplink transmission of transmission signals between D2D user terminals to the uplink user terminal signal interference. Wherein, the D2D UE and the uplink UE are located within the signal coverage of the base station.
在步骤302中,该基站为所述D2D用户端和所述上行用户端配置功率控制参数。In step 302, the base station configures power control parameters for the D2D UE and the uplink UE.
具体的,对于开环功率控制而言,D2D的传输功率并不是固定不变的,D2D用户端需要根据功率控制参数动态地设定传输功率。为了使得D2D用户端合适地设定传输功率,根据本发明所公开的一个实施例,基站为D2D用户端配置以下功率控制参数:Specifically, for the open-loop power control, the D2D transmission power is not fixed, and the D2D UE needs to dynamically set the transmission power according to the power control parameters. In order to enable the D2D UE to properly set the transmission power, according to an embodiment disclosed in the present invention, the base station configures the following power control parameters for the D2D UE:
PCMAX,C:单位为dBm,其表示该基站覆盖的所有用户端的每个载波所允许使用的最大传输功率。P CMAX, C : the unit is dBm, which represents the maximum transmission power allowed by each carrier of all UEs covered by the base station.
ΔD2D:单位为dB,是D2D特定功率控制参数,其表示传输功率的修正值,用于修正传输功率的大小。其被该基站覆盖的所有D2D用户中使用。基站可以根据具体的应用情况,适当地设定该D2D特定功率控制参数。可以根据如下所示的公式(1)设定该参数:Δ D2D : the unit is dB, which is a specific power control parameter of D2D, which represents the correction value of the transmission power, and is used to correct the magnitude of the transmission power. It is used by all D2D users covered by the base station. The base station can properly set the D2D specific power control parameters according to specific application conditions. This parameter can be set according to the formula (1) shown below:
PONorminal_PUCCH-(PO_Norminal_PUCCH+ΔD2D+10log10(NPRB_D2d)-36)>γPUCCH(1)其中,公式(1)的左边表示基站接收到的上行用户端所发送的PUCCH信号与基站附近由D2D传输所造成的带内干扰的功率比例。公式右边的参数γPUCCH表示假设的SIR(信噪比)阈值。符号NPRB_D2D表示D2D用户端所在频域所使用的物理资源块的数量。符号-36表示通常带内干扰的起始水平(例如,图1所示的功率示意图,信号和干扰的起始水平都是-36dB),根据系统内带内干扰的起始水平不同,该值可替换成任意值。(PO_Norminal_PUCCH+ΔD2D+10log10(NPRB_D2d)-36),表示基站附近由D2D传输所造成的带内干扰。P ONorminal_PUCCH -(P O_Norminal_PUCCH +Δ D2D +10log 10 (N PRB_D2d )-36)>γ PUCCH (1) Wherein, the left side of the formula (1) indicates that the PUCCH signal received by the base station and sent by the uplink user terminal is close to the base station The power ratio of in-band interference caused by D2D transmission. The parameter γ PUCCH on the right side of the formula represents an assumed SIR (Signal to Noise Ratio) threshold. The symbol N PRB_D2D represents the number of physical resource blocks used by the D2D UE in the frequency domain. Symbol -36 indicates the initial level of in-band interference (for example, the power diagram shown in Figure 1, the initial level of signal and interference are both -36dB), according to the initial level of in-band interference in the system, this value Can be replaced with any value. (P O_Norminal_PUCCH +Δ D2D +10log 10 (N PRB_D2d )-36), represents the in-band interference caused by D2D transmission near the base station.
例如,假设NPRB_D2D是44并且是γPUCCH是-3dB,我们可以获得ΔD2D<22.56(dB)。需要指出的是,通过上述公式(1)获得所述ΔD2D是众多配置所述ΔD2D的方式中的一种。在实际实施中,不排除其他的设定方式,例如,可以根据无线网络的传输状况预估一个值作为所述D2D特定功率控制参数ΔD2D的值,同样,也可以根据实际的操作经验来设定该值。For example, assuming N PRB_D2D is 44 and γ PUCCH is -3dB, we can obtain Δ D2D < 22.56(dB). It should be pointed out that obtaining the Δ D2D through the above formula (1) is one of many ways to configure the Δ D2D . In actual implementation, other setting methods are not excluded. For example, a value can be estimated according to the transmission status of the wireless network as the value of the D2D specific power control parameter ΔD2D . Similarly, it can also be set according to actual operating experience. set the value.
另外需要注意的是,在本示例中,在步骤302中配置的D2D特定功率控制参数ΔD2D的设定值仅是一个初始值并且可能需要根据实际测量和PUCCH进一步的调整。It should also be noted that in this example, the set value of the D2D specific power control parameter ΔD2D configured in step 302 is only an initial value and may need further adjustment according to actual measurement and PUCCH.
除此之外,基站还为上行用户端配置以下功率控制参数:In addition, the base station also configures the following power control parameters for the uplink UE:
PO_Norminal_PUCCH:单位为dBm,其是上行用户端的公共功率控制参数,通常上行用户端的基准传输功率被设置为PO_Norminal_PUCCH+PL,其中PL为上行用户端至基站端的路径损耗。尽管该参数是用于上行用户端的传输功率控制,但是为了使D2D的用户端能够根据上行用户的传输功率来相应的设置合适的D2D传输功率,D2D用户端也需要获取该参数。P O_Norminal_PUCCH : the unit is dBm, which is the common power control parameter of the uplink user end. Usually, the reference transmission power of the uplink user end is set to P O_Norminal_PUCCH +PL, where PL is the path loss from the uplink user end to the base station. Although this parameter is used for the transmission power control of the uplink user end, in order to enable the D2D user end to set an appropriate D2D transmission power according to the transmission power of the uplink user end, the D2D user end also needs to obtain this parameter.
D2D用户端在获得上述功率控制参数后,可以结合D2D用户端与基站之间的路径损耗PL,计算出D2D用户端的传输功率。根据本发明所公开的实施例,可以使用功率控制公式(2):After obtaining the above power control parameters, the D2D UE can calculate the transmission power of the D2D UE in combination with the path loss PL between the D2D UE and the base station. According to the disclosed embodiments of the present invention, the power control formula (2) can be used:
PD2D=min{PCMAX,c,PO_Norminal_PUCCH+PL+ΔD2D} (2)来计算获得D2D用户端的传输功率。P D2D =min{P CMAX,c ,P O_Norminal_PUCCH +PL+Δ D2D } (2) to calculate and obtain the transmission power of the D2D user end.
在另一个具体的实施例中,步骤304还包括配置限定的D2D传输资源集合,所述限定的D2D传输资源集合由限定的D2D传输资源组成,所述限定的D2D传输资源在频域中,离所述上行用户端发送上行信息所用的传输资源相对较远。该限定的D2D传输资源集合可以在步骤304中通过基站被广播至无线网络中。In another specific embodiment, step 304 further includes configuring a limited D2D transmission resource set, the limited D2D transmission resource set is composed of limited D2D transmission resources, and the limited D2D transmission resources are in the frequency domain, separated from The transmission resources used by the uplink user end for sending uplink information are relatively far away. The limited set of D2D transmission resources may be broadcast to the wireless network by the base station in step 304 .
在步骤304中,基站把所述配置后的功率控制参数通过系统信息或者配置信息广播至所述无线网络中。In step 304, the base station broadcasts the configured power control parameters to the wireless network through system information or configuration information.
具体的,在该步骤中所述配置后的功率控制参数被置入系统信息或者配置信息中,然后通过的广播的方式把该功率控制参数发送至无线网络中,位于该基站信号覆盖范围内的D2D用户端可以通过接收基站广播出的系统信息或者配置信息来获取所需要的功率控制参数。当D2D用户端获取该功率控制参数后会根据这些参数设定相应的D2D传输功率,并实施D2D信息的传输。Specifically, in this step, the configured power control parameters are put into the system information or configuration information, and then the power control parameters are sent to the wireless network in the way of broadcasting, and the power control parameters located within the signal coverage of the base station The D2D UE can obtain the required power control parameters by receiving system information or configuration information broadcast by the base station. After obtaining the power control parameters, the D2D UE will set the corresponding D2D transmission power according to these parameters, and implement the transmission of D2D information.
在步骤306中,基站测量所述D2D用户端发送的传输信号对所述上行用户端的上传信号的干扰程度。In step 306, the base station measures the interference degree of the transmission signal sent by the D2D user terminal to the uplink signal of the uplink user terminal.
具体的,基站会对基站侧的D2D传输信号所产生的带内干扰的强度与上行用户端发送的上行信号的强度进行测量,从而确定所述带内干扰的干扰程度以及所述带内干扰是否会对基站正常接收该上行信号造成影响。Specifically, the base station will measure the strength of the in-band interference generated by the D2D transmission signal on the base station side and the strength of the uplink signal sent by the uplink user end, so as to determine the interference degree of the in-band interference and whether the in-band interference It will affect the normal reception of the uplink signal by the base station.
在步骤308中,基站根据所述干扰程度的测量结果,调整部分所述功率控制参数。In step 308, the base station adjusts part of the power control parameters according to the measurement result of the interference degree.
具体的,可以设定一个干扰程度的限度范围,该范围的上限可以代表:在不影响基站正常接收上行用户端发送的上行信号的情况下,基站可承受的最大的干扰程度。该范围的下限可以代表:在基站正常接收上行用户端发送的上行信号时,基站可以忽略的最大的干扰程度。Specifically, a limit range of the interference degree may be set, and the upper limit of the range may represent: the maximum interference degree that the base station can bear without affecting the normal reception of the uplink signal sent by the uplink user terminal by the base station. The lower limit of the range may represent: when the base station normally receives the uplink signal sent by the uplink user terminal, the base station can ignore the maximum degree of interference.
在本发明所公开的一个示例中,当所述干扰程度的测量结果超过预定的限度范围时,减小所述D2D特定功率控制参数ΔD2D的值;以使得D2D的传输功率减小,避免D2D的传输功率影响基站接收上行用户端所发送的上行信号。In an example disclosed in the present invention, when the measurement result of the interference degree exceeds a predetermined limit range, the value of the D2D specific power control parameter ΔD2D is reduced; so that the D2D transmission power is reduced to avoid D2D The transmission power affects the reception of the uplink signal sent by the uplink user terminal by the base station.
当所述干扰程度的测量结果低于所述预定的限度范围时,增加所述D2D特定功率控制参数ΔD2D的值;以使得D2D的传输功率,在不影响基站接收上行用户端所发送的上行信号的前提下,获得尽可能大的值。When the measurement result of the interference degree is lower than the predetermined limit range, increase the value of the D2D specific power control parameter ΔD2D ; so that the D2D transmission power does not affect the base station receiving the uplink sent by the uplink user terminal Under the premise of the signal, obtain the largest possible value.
当所述干扰程度的测量结果处于所述预定的限度范围内时,保持所述D2D特定功率控制参数ΔD2D的值。When the measurement result of the degree of interference is within the predetermined limit range, the value of the D2D specific power control parameter ΔD2D is maintained.
所述D2D特定功率控制参数ΔD2D的值将在步骤310中被基站通过系统信息或者配置信息广播至所述无线网络中。The value of the D2D specific power control parameter ΔD2D will be broadcast to the wireless network by the base station through system information or configuration information in step 310 .
然而,即使使用上述方法调整了所述D2D特定功率控制参数ΔD2D的值,尽管来自D2D传输的干扰通过D2D的功率控制被大幅降低,但是其仍然明显大于非D2D子帧的干扰。因此,为了保证基站侧接收的PUCCH信道的质量,基站要适当地调节上行用户端的功率控制参数。However, even if the value of the D2D-specific power control parameter ΔD2D is adjusted using the above method, although the interference from D2D transmissions is greatly reduced by D2D power control, it is still significantly larger than the interference of non-D2D subframes. Therefore, in order to ensure the quality of the PUCCH channel received by the base station side, the base station should properly adjust the power control parameters of the uplink user terminal.
根据本发明所公开的一个实施例,为了避免上行用户端的功率控制对D2D功率控制的内在影响,通过RRC信令向上行用户端发送专用PUCCH功率控制参数PO-UE-PUCCH以进一步调节上行用户端的传输功率。通常基站基于基站侧对于带内干扰程度的测量结果,来配置该专用PUCCH功率控制参数PO-UE-PUCCH。需要说明的是,所述专用PUCCH功率控制参数PO-UE-PUCCH是根据不同的上行用户端而分别配置的。According to an embodiment disclosed in the present invention, in order to avoid the internal influence of the power control of the uplink user terminal on the D2D power control, the dedicated PUCCH power control parameter P O-UE-PUCCH is sent to the uplink user terminal through RRC signaling to further adjust the uplink user terminal. end transmission power. Usually, the base station configures the dedicated PUCCH power control parameter P O-UE-PUCCH based on the measurement result of the in-band interference degree at the base station side. It should be noted that the dedicated PUCCH power control parameter P O-UE-PUCCH is configured according to different uplink UEs.
在实际实施中,该专用PUCCH功率控制参数PO-UE-PUCCH的相对大的值被配置在D2D子帧的初始阶段中,并且在之后的时序中,基于对D2D子帧的实际测量值更新该专用PUCCH功率控制参数PO-UE-PUCCH。所述专用PUCCH功率控制参数PO-UE-PUCCH通过RRC信令发送给各个上行用户端中。In actual implementation, the relatively large value of the dedicated PUCCH power control parameter P O-UE-PUCCH is configured in the initial stage of the D2D subframe, and in the subsequent sequence, based on the actual measurement value of the D2D subframe to update The dedicated PUCCH power control parameter P O-UE-PUCCH . The dedicated PUCCH power control parameter P O-UE-PUCCH is sent to each uplink UE through RRC signaling.
在步骤310中,把所述调整后的功率控制参数通过系统信息或者配置信息广播至所述无线网络中。In step 310, broadcast the adjusted power control parameters to the wireless network through system information or configuration information.
具体的,基站把所述调整后的功率控制参数,如,D2D特定功率控制参数ΔD2D,置入系统信息或者配置信息中,然后通过的广播的方式把该功率控制参数发送至无线网络中,位于该基站信号覆盖范围内的D2D用户端可以通过接收基站广播出的系统信息或者配置信息来获取所需要的功率控制参数。Specifically, the base station puts the adjusted power control parameter, such as the D2D specific power control parameter Δ D2D , into system information or configuration information, and then sends the power control parameter to the wireless network through broadcasting, The D2D UE located within the signal coverage of the base station can obtain the required power control parameters by receiving the system information or configuration information broadcast by the base station.
根据本发明所公开的另一个实施例,在步骤310完成后,重复执行步骤306,以使得步骤306至310被重复的循环实施,从而实现持续的测量所述D2D用户端发送的传输信号对所述上行用户端的上传信号的干扰程度,并根据该干扰程度调整该功率控制参数。According to another embodiment disclosed in the present invention, after step 310 is completed, step 306 is repeatedly executed, so that steps 306 to 310 are repeatedly implemented in a loop, so as to continuously measure the impact of the transmission signal sent by the D2D UE on the The interference degree of the uploaded signal of the uplink user end, and adjust the power control parameter according to the interference degree.
另外,在一些实施应用中,出于某些目的,所用的D2D发射端所使用的传输功率需要被通知给D2D接收机(例如,为了实现相邻距离的估算)。对此,根据本发明所公开的另一个实施例中,在步骤302中还包括:配置传输功率PD2D的量化集合。这样,基于给定的传输功率集合,在开环功率控制中所使用的D2D传输功率可以根据该量化集合被量化,该量化集合可以被预定义在系统规格中或由基站配置,并在步骤304中以半静态方式通过基站广播至无线网络中。所述量化集合中的元素与所述传输功率PD2D的对应关系为:In addition, in some implementation applications, for some purposes, the transmission power used by the D2D transmitter needs to be notified to the D2D receiver (for example, to realize the estimation of the neighbor distance). For this, according to another embodiment disclosed in the present invention, step 302 further includes: configuring a quantization set of transmission power P D2D . In this way, based on a given transmission power set, the D2D transmission power used in open-loop power control can be quantized according to the quantization set, which can be predefined in the system specification or configured by the base station, and in step 304 broadcast to the wireless network through the base station in a semi-static manner. elements in the quantized set The corresponding relationship with the transmission power P D2D is:
其中,{P0,P1,...,PM-1}为所述传输功率PD2D的量化集合,M为量化集合中元素的个数。Wherein, {P 0 , P 1 , ..., P M-1 } is the quantization set of the transmission power P D2D , and M is the number of elements in the quantization set.
图4示出了根据上述所公开方案在D2D用户侧对传输功率PD2D实施控制的方法流程图。Fig. 4 shows a flow chart of a method for controlling the transmission power P D2D at the D2D user side according to the above disclosed solutions.
在步骤402中,周期性地接收由所述基站广播的系统信息或者配置信息,并从中获取功率控制参数。In step 402, periodically receive system information or configuration information broadcast by the base station, and obtain power control parameters therefrom.
具体的,D2D用户端周期性地获取基站所广播的系统信息或者配置信息,并从中获取功率控制参数:ΔD2D、PO_Norminal_PUCCH和PCMAX, C(这些参数上文已经介绍过,此处不再赘述)。Specifically, the D2D UE periodically obtains system information or configuration information broadcast by the base station, and obtains power control parameters: ΔD2D , P O_Norminal_PUCCH , and PCMAX, C (these parameters have been introduced above and will not be repeated here. repeat).
根据本发明所公开的另一个实施例,步骤402还包括从所述系统信息或者配置信息中获取基站发送的量化集合{P0,P1,...,PM-1}。According to another embodiment disclosed in the present invention, step 402 further includes obtaining the quantization set {P 0 , P 1 , . . . , P M-1 } sent by the base station from the system information or configuration information.
在步骤404中,D2D用户端对其与基站间的路径损耗进行测量。现有技术中的各种测量路径损耗的方法都可以被实施于本方法中,以获取D2D用户端与基站间的路径损耗,此处不深入讨论。In step 404, the D2D UE measures the path loss between itself and the base station. Various methods for measuring path loss in the prior art can be implemented in this method to obtain the path loss between the D2D UE and the base station, which will not be further discussed here.
在步骤406中,D2D用户端根据功率控制参数和路径损耗确定所述D2D用户端的传输功率PD2D。根据本发明所公开的一个实施例,提供了一种根据功率控制参数和路径损耗计算D2D传输功率PD2D的方法。即,根据公式:In step 406, the D2D UE determines the transmission power P D2D of the D2D UE according to the power control parameter and the path loss. According to an embodiment disclosed in the present invention, a method for calculating D2D transmission power P D2D according to power control parameters and path loss is provided. That is, according to the formula:
PD2D=min{PCMAX,c,PO_Norminal_PUCCH+PL+ΔD2D} (2)P D2D = min{P CMAX, c , P O_Norminal_PUCCH +PL+Δ D2D } (2)
来计算获得D2D用户端的传输功率。当然本发明并不限于以此公式获得D2D用户端的传输功率。其他根据所述功率控制参数获得D2D用户端的传输功率PD2D的方式也适用于本发明。to calculate and obtain the transmission power of the D2D user end. Of course, the present invention is not limited to obtaining the transmission power of the D2D UE by using this formula. Other ways of obtaining the transmission power P D2D of the D2D UE according to the power control parameters are also applicable to the present invention.
在步骤408中,D2D用户端根据在步骤402中所获取的量化集合或在系统中预定义的量化集合对步骤406中所确定的传输功率PD2D实施量化处理以获得量化后的D2D传输功率所述量化过程可以根据公式(3)实现:In step 408, the D2D UE performs quantization processing on the transmission power P D2D determined in step 406 according to the quantization set obtained in step 402 or the quantization set predefined in the system to obtain the quantized D2D transmission power Described quantization process can realize according to formula (3):
在公式(3)中,如果根据功率控制公式(2)计算的传输功率值小于最小量化功率值P0,那么实际应用的传输功率值就可能如每个基站所的配置的0或者最小功率值P0。In formula (3), if the transmission power value calculated according to the power control formula (2) is less than the minimum quantization power value P 0 , then the actual applied transmission power value may be 0 or the minimum power value configured by each base station P 0 .
在前一个例子中(传输功率值设置为0),其意味着当一个D2D用户移动至基站附近,以至于从功率控制公式(2)中计算获得的传输功率值太低,这将使得该D2D用户端不能进行D2D信息的发送,而只能接收来自其他D2D用户的D2D信息。In the previous example (the transmission power value is set to 0), it means that when a D2D user moves near the base station, so that the transmission power value calculated from the power control formula (2) is too low, which will make the D2D The UE cannot send D2D information, but can only receive D2D information from other D2D users.
在后一个情况中(传输功率PD2D当小于P0,那么把设置为最小量化功率值P0),其意味着当一个D2D用户移动至基站附近,允许D2D用户端使用最小传输功率P0进行D2D传输。为了减低对于基站的潜在的带内干扰,推荐D2D用户端可以仅仅使用一些限定的D2D资源集合中的限定的D2D资源(自动选择或由基站分配)。所述限定的D2D资源集合中的PRB资源在频域中,离上行用户端的PUCCH信道所用的PRB资源相对较远。通过图1可以发现,相邻于D2D所用物理资源块附近的带内发射干扰仍然相对较高。限定的D2D资源集合的配置信息可以与其他功率控制参数,在系统信息中通过基站被广播至无线网络中。In the latter case (when the transmission power P D2D is less than P 0 , then put It is set to the minimum quantization power value P 0 ), which means that when a D2D user moves near the base station, the D2D user terminal is allowed to use the minimum transmission power P 0 for D2D transmission. In order to reduce the potential in-band interference to the base station, it is recommended that the D2D UE can only use limited D2D resources (automatically selected or allocated by the base station) in some limited D2D resource sets. The PRB resources in the limited D2D resource set are relatively far from the PRB resources used by the PUCCH channel of the uplink UE in the frequency domain. It can be found from Fig. 1 that the in-band transmission interference adjacent to the physical resource blocks used by D2D is still relatively high. The configuration information of the limited D2D resource set can be broadcast to the wireless network through the base station in the system information together with other power control parameters.
图5示出了根据上述所公开的方案,在上行用户侧对上行用户端的传输功率实施控制的方法流程图。Fig. 5 shows a flow chart of a method for controlling the transmission power of the uplink user end at the uplink user side according to the solution disclosed above.
在步骤502中,上行用户端周期性地接收由所述基站广播的系统信息或者配置信息,并从中获取功率控制参数。所述功率控制参数包括PO_Norminal_PUCCH。In step 502, the uplink UE periodically receives system information or configuration information broadcast by the base station, and obtains power control parameters therefrom. The power control parameters include P O_Norminal_PUCCH .
在步骤504中,上行用户端判断下行信道中的RRC信令中是否包含专用PUCCH功率控制参数PO-UE-PUCCH,当RRC信令中包含所述专用PUCCH功率控制参数PO-UE-PUCCH时,实施步骤508;当RRC信令中不包含所述专用PUCCH功率控制参数PO-UE-PUCCH时,实施步骤506。In step 504, the uplink UE judges whether the RRC signaling in the downlink channel includes the dedicated PUCCH power control parameter P O-UE-PUCCH , and when the RRC signaling includes the dedicated PUCCH power control parameter P O-UE-PUCCH , step 508 is implemented; when the dedicated PUCCH power control parameter P O-UE-PUCCH is not included in the RRC signaling, step 506 is implemented.
在步骤506中,上行用户端根据所述功率控制参数中的公共PUCCH功率控制参数PO_Norminal_PUCCH确定所述上行用户端的传输功率。In step 506, the uplink user terminal determines the transmission power of the uplink user terminal according to the common PUCCH power control parameter P O_Norminal_PUCCH among the power control parameters.
在步骤508中,上行用户端根据所述公共PUCCH功率控制参数PO_Norminal_PUCCH及所述专用PUCCH功率控制参数PO-UE-PUCCH确定所述上行用户端的传输功率。即,在原有PO_Norminal_PUCCH的基础上再加上PO-UE-PUCCH,从而提高上行用户端的传输功率。In step 508, the uplink UE determines the transmission power of the uplink UE according to the common PUCCH power control parameter P O_Norminal_PUCCH and the dedicated PUCCH power control parameter P O-UE-PUCCH . That is, a PO -UE-PUCCH is added on the basis of the original PO_Norminal_PUCCH , so as to increase the transmission power of the uplink user terminal.
接下来将通过一个系统级的仿真来验证上述方案的有效性。表-1列出了该仿真的主要参数。图6-8示出了仿真结果。Next, a system-level simulation will be used to verify the effectiveness of the above scheme. Table-1 lists the main parameters of the simulation. Figures 6-8 show the simulation results.
图6示出了在基站侧接收到的PUCCH信号上的信号与干扰加噪声比(SINR)的累积分布函数(CDF)示意图;在图6中,我们可以发现当没有实施本发明所公开的D2D传输功率控制方案时,大约有30%的接收到的PUCCH具有低于5dB的信号与干扰加噪声比(SINR),然而,当应用了本发明所提出的的功率控制方案后,几乎所有的接收到的PUCCH都具有超过-5db的信号与干扰加噪声比(SINR)。因此D2D传输对于PUCCH接收的潜在的影响基本被避免。Fig. 6 shows a schematic diagram of the cumulative distribution function (CDF) of the signal-to-interference-plus-noise ratio (SINR) on the PUCCH signal received at the base station side; in Fig. 6, we can find that when the D2D disclosed in the present invention is not implemented When the power control scheme is transmitted, approximately 30% of the received PUCCHs have a signal-to-interference-plus-noise ratio (SINR) lower than 5dB, however, after applying the power control scheme proposed by the present invention, almost all received All received PUCCHs have a signal-to-interference-plus-noise ratio (SINR) exceeding -5db. Therefore the potential impact of D2D transmission on PUCCH reception is basically avoided.
图7示出了具有功率控制和不具有功率控制的D2D传输功率的累积分布函数(CDF:Cumulative Distribution Function)示意图。从图中,我们可以发现,当用户端使用本发明所公开的传输功率控制方案后,超过40%的D2D用户端使用大于0dBm的传输功率。FIG. 7 shows a schematic diagram of Cumulative Distribution Function (CDF: Cumulative Distribution Function) of D2D transmission power with power control and without power control. From the figure, we can find that after the UEs use the transmission power control scheme disclosed in the present invention, more than 40% of the D2D UEs use a transmission power greater than 0 dBm.
对于使用D2D传输功率控制的一个可能的担心是:低功率的传输可能对D2D传输的运行有消极的影响(例如D2D相邻发现)。图8中的展示了相关的仿真结果。图8示出了使用功率控制和未使用功率控制时,D2D接收机上发现的邻居数的累积分布函数(CDF)示意图。图中示出了每个D2D发现接收机在一个发现周期中所发现的邻居用户数的累积分布函数(CDF)。从图中可以发现,在有功率控制的条件下,尽管D2D传输功率被减小,但是最终所发现邻居数只有有限的降低。其原因是:尽管有用的信号功率被降低,但是另一方面,来自其他D2D传输和上行用户的PUCCH传输的带内干扰也降低了。因此使用本发明所公开的功率控制方案,邻居发现性能降低非常有限。One possible concern with using D2D transmission power control is that low power transmissions may have a negative impact on the operation of D2D transmissions (eg D2D neighbor discovery). Figure 8 shows the related simulation results. Fig. 8 shows a schematic diagram of the cumulative distribution function (CDF) of the number of neighbors found on the D2D receiver when power control is used and when power control is not used. The figure shows the cumulative distribution function (CDF) of the number of neighboring users discovered by each D2D discovery receiver in one discovery cycle. It can be seen from the figure that under the condition of power control, although the D2D transmission power is reduced, the number of neighbors found is only limited in the end. The reason is: although the useful signal power is reduced, on the other hand, the in-band interference from other D2D transmissions and PUCCH transmissions of uplink users is also reduced. Therefore, using the power control scheme disclosed in the present invention, the neighbor discovery performance degradation is very limited.
表-1Table 1
对于本领域技术人员而言,显然本发明不限于上述示范性实施例的细节,而且在不背离本发明的精神或基本特征的情况下,能够以其他的具体形式实现本发明。因此,无论如何来看,均应将实施例看作是示范性的,而且是非限制性的。此外,明显的,“包括”一词不排除其他元素和步骤,并且措辞“一个”不排除复数。装置权利要求中陈述的多个元件也可以由一个元件来实现。第一,第二等词语用来表示名称,而并不表示任何特定的顺序。It will be apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Accordingly, the embodiments should be regarded in all respects as exemplary and not restrictive. Furthermore, it is obvious that the word "comprising" does not exclude other elements and steps, and the word "a" does not exclude the plural. A plurality of elements recited in device claims may also be embodied by one element. The words first, second, etc. are used to denote names and do not imply any particular order.
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