技术领域technical field
本发明涉及一种小区干扰协调方法，具体涉及一种面向电力输电场景的4G专网小区干扰协调方法。The present invention relates to a cell interference coordination method, in particular to a 4G private network cell interference coordination method for power transmission scenarios.
背景技术Background technique
LTE(LongTermEvolution)通用移动通信技术的长期演进技术作为一种新的无线接入技术，具有更低传输时延、提供更高传输速率、增加系统容量、增强网络覆盖、优化网络架构等特点，在国内外得到了广泛的部署和应用，目前已经有上百个国家的运营商建设部署了两百多个LTE网络，LTE已经成为全球4G发展的主流。在中国，三大网络运营商都已经部署了LTE网络并进行了商用。基于LTE的高速率、高带宽、高频谱利用率等技术优势，4G专网也在国内得到了试点应用，国内已有北京、天津、南京等城市启动了LTE政务专网建设。对于电力行业来说，4G技术在国家电网、南方电网等城市也进行了试点应用。As a new wireless access technology, the long-term evolution technology of LTE (LongTerm Evolution) universal mobile communication technology has the characteristics of lower transmission delay, higher transmission rate, increased system capacity, enhanced network coverage, and optimized network architecture. It has been widely deployed and applied at home and abroad. At present, operators in hundreds of countries have constructed and deployed more than 200 LTE networks. LTE has become the mainstream of global 4G development. In China, the three major network operators have deployed and commercialized LTE networks. Based on LTE's technical advantages such as high speed, high bandwidth, and high spectrum utilization, 4G private networks have also been piloted in China. Beijing, Tianjin, Nanjing and other cities in China have launched LTE government private network construction. For the power industry, 4G technology has also been piloted in cities such as the State Grid and China Southern Power Grid.
目前，国家电网公司系统内的相关单位也进行了4G网络的应用尝试。为了解决城市中敷设光缆路径困难、建设成本高的难题，唐山供电公司建成了基于1.8GHz频段TD-LTE技术的4G无线通信专网，作为光纤专用网络的补充手段，解决通信网络“最后一公里”的瓶颈，实现了输、变、配、用等环节运行状态的实时感知、动态预警，以及对客户能耗的实时监测与综合有效利用；福建供电公司也开展了4G专网的试点建设，解决了配网通信、用户集抄、应急通信等问题。At present, relevant units within the State Grid Corporation of China have also tried to apply 4G networks. In order to solve the problems of difficult laying optical cable paths and high construction costs in cities, Tangshan Power Supply Company has built a 4G wireless communication private network based on TD-LTE technology in the 1.8GHz frequency band. "The bottleneck of the network has realized real-time perception and dynamic early warning of the operation status of transmission, transformation, distribution, and use, as well as real-time monitoring and comprehensive and effective utilization of customer energy consumption; Fujian Power Supply Company has also carried out the pilot construction of 4G private network, It solves the problems of distribution network communication, user collection, emergency communication, etc.
为了提高4G网络用户在小区边缘的数据传输速率，支撑同频组网，必须引入小区间干扰控制技术，现有的主要技术有：干扰随机化技术、干扰消除技术、小区间干扰协调技术。其中，干扰协调技术(ICIC)是通过协调空口资源，包括频率资源和功率资源，避免或降低小区间干扰的技术，主要用于解决宏蜂窝连续覆盖下业务信道的同频邻区干扰问题，这种技术实现比较简单，效果较好，成为LTE抑制小区间干扰的主流技术。但该技术的主要缺点是小区边缘的频率资源有限，对小区边缘的峰值速率和系统整体容量有所影响。其中软频率复用作为干扰协调的关键技术，得到了广泛应用，其主要思想是分为预留受保护和不受保护频段，相邻小区的受保护频段错开，预留的方式能够保证降低干扰，但缺少了灵活性。In order to improve the data transmission rate of 4G network users at the edge of the cell and support the same-frequency networking, it is necessary to introduce inter-cell interference control technology. The existing main technologies include: interference randomization technology, interference cancellation technology, and inter-cell interference coordination technology. Among them, interference coordination technology (ICIC) is a technology that avoids or reduces inter-cell interference by coordinating air interface resources, including frequency resources and power resources. This technology is relatively simple to implement and has a good effect, and has become the mainstream technology for suppressing inter-cell interference in LTE. However, the main disadvantage of this technology is that the frequency resources at the edge of the cell are limited, which affects the peak rate at the edge of the cell and the overall capacity of the system. Among them, soft frequency reuse, as a key technology for interference coordination, has been widely used. Its main idea is to reserve protected and unprotected frequency bands. The protected frequency bands of adjacent cells are staggered, and the reserved method can ensure the reduction of interference. , but lacks flexibility.
而对于电力行业来说，其网络业务特性与4G公网的业务特性有所不同，主要表现在：电力业务以固定类业务居多，只存在少量的移动应用场景(线路巡检等)；业务传输不需多用户同时在线，数据传输具有周期性；电力可用频段较少，可申请的授权频段一般在几M左右，采用预留的方式，频段利用效率不高；公网的网络覆盖场景呈蜂窝状，采用软复用方式，频率复用因子为3，而输电网络的网络架构呈链式状，不仅会出现小区间干扰，而且降低了频谱利用率。For the electric power industry, its network service characteristics are different from those of the 4G public network, mainly in the following aspects: electric power services are mostly fixed services, and there are only a small number of mobile application scenarios (line inspection, etc.); business transmission There is no need for multiple users to be online at the same time, and data transmission is periodic; there are few frequency bands available for power, and the authorized frequency bands that can be applied for are generally around a few M. Using the reserved method, the frequency band utilization efficiency is not high; the network coverage of the public network is cellular. The soft multiplexing method is adopted, the frequency multiplexing factor is 3, and the network structure of the power transmission network is chain-like, which will not only cause inter-cell interference, but also reduce the spectrum utilization rate.
发明内容Contents of the invention
为了克服上述现有技术的不足，本发明提供一种面向电力输电场景的4G专网小区干扰协调方法，本发明所提的干扰协调方法中的频率子集划分采用了动态的划分方式，提高了频率利用率，保证通信信道质量。In order to overcome the above-mentioned deficiencies in the prior art, the present invention provides a 4G private network cell interference coordination method oriented to power transmission scenarios. The frequency subset division in the interference coordination method proposed in the present invention adopts a dynamic division method, which improves the The frequency utilization rate ensures the communication channel quality.
为了实现上述发明目的，本发明采取如下技术方案：In order to realize the above-mentioned purpose of the invention, the present invention takes the following technical solutions:
一种面向电力输电场景的4G专网小区干扰协调方法，所述方法包括如下步骤：A 4G private network cell interference coordination method oriented to electric power transmission scenarios, said method comprising the steps of:
(1)4G专网网络架构中的基站对可用频率资源进行分集初始化；(1) The base station in the 4G private network network architecture performs diversity initialization on the available frequency resources;
(2)所述基站获取与业务终端之间的通信信道的信道状况，分析干扰产生的原因和干扰的类型；(2) The base station acquires the channel status of the communication channel with the service terminal, and analyzes the cause of the interference and the type of the interference;
(3)根据干扰类型，结合可用资源和业务需求的现状，选取对应的干扰协调方法。(3) Select a corresponding interference coordination method according to the type of interference, combined with the current situation of available resources and service requirements.
优选的，所述步骤(1)中，所述4G专用网络架构包括：基站和业务终端，所述基站采用分布式基站方式部署，所述基站包括中心单元BBU和若干远端RRU，所述BBU放置在变电站内，所述RRU放置在输电杆塔上，两者之间通过电力特种光缆连接，所述RRU之间采集级联的方式连接，且使用透明传输的方式传输，所述RRU与业务终端之间通过申请的电力专用频段连接，每个所述RRU覆盖的区域为一个小区。Preferably, in the step (1), the 4G dedicated network architecture includes: a base station and a service terminal, and the base station is deployed in a distributed base station manner, and the base station includes a central unit BBU and several remote RRUs, and the BBU Placed in the substation, the RRU is placed on the power transmission tower, and the two are connected by a special power optical cable. The RRUs are connected in a cascading manner and transparently transmitted. The RRU and the service terminal The area covered by each RRU is a cell.
优选的，所述步骤(1)中，所述可用频率资源分为两个动态子集，一个子集给小区的中心用户使用，另一个子集给小区的边缘用户使用。Preferably, in the step (1), the available frequency resources are divided into two dynamic subsets, one subset is used by the central users of the cell, and the other subset is used by the edge users of the cell.
优选的，所述步骤(2)中，所述干扰产生的原因若为两个相邻小区覆盖交叉区域出现了同时传输干扰，则进行同时传输干扰协调，所述干扰的类型包括如下情况：Preferably, in the step (2), if the cause of the interference is simultaneous transmission interference in two adjacent cell coverage intersection areas, simultaneous transmission interference coordination is performed, and the type of interference includes the following situations:
A、小区RRU1的中心用户同时传输数据，小区RRU2的中心用户不传输数据；A. The central user of cell RRU1 transmits data at the same time, and the central user of cell RRU2 does not transmit data;
B、小区RRU1的中心用户同时传输数据，小区RRU2的中心用户也同时传输数据；B. The central user of cell RRU1 transmits data at the same time, and the central user of cell RRU2 also transmits data at the same time;
C、小区RRU1的中心用户不传输数据，小区RRU2的中心用户同时传输数据；C. The central user of cell RRU1 does not transmit data, and the central user of cell RRU2 transmits data at the same time;
D、小区RRU1和小区RRU2的中心用户都不传输数据。D. The central users of the cell RRU1 and the cell RRU2 do not transmit data.
优选的，所述步骤(3)中，所述干扰类型为A或C时，对应的干扰协调方法为：根据满载小区的边缘用户频段使用情况进行灵活调整，即未满载小区的边缘用户选取与满载小区边缘用户使用不交叉的频段，所述满载小区为中心用户同时传输数据的小区，所述未满载小区为中心用户不传输数据的小区。Preferably, in the step (3), when the interference type is A or C, the corresponding interference coordination method is: flexibly adjust according to the usage of the frequency band of the edge users of the fully loaded cell, that is, the selection of the edge user of the not fully loaded cell and Edge users of a fully loaded cell use non-intersecting frequency bands, the fully loaded cell is a cell where central users transmit data at the same time, and the less fully loaded cell is a cell where central users do not transmit data.
优选的，所述干扰类型为B时，采用两种协调方法包括：多跳方式和暂时扣除交叉频段方式，所述多跳方式包括如下步骤：Preferably, when the interference type is B, two coordination methods are adopted including: a multi-hop method and a method of temporarily deducting cross-frequency bands, and the multi-hop method includes the following steps:
步骤3-1-1、最边缘用户和次边缘用户根据无线传输环境进行多跳传输连接协商，两者根据协商结果调整使用频段参数、数据调制类型参数和发射功率参数，Step 3-1-1, the most marginal user and the second marginal user perform multi-hop transmission connection negotiation according to the wireless transmission environment, and adjust the frequency band parameters, data modulation type parameters and transmission power parameters according to the negotiation results,
步骤3-1-2、两者之间建立相应的数据传输通道；Step 3-1-2, establishing a corresponding data transmission channel between the two;
步骤3-1-3、最边缘用户转发数据给次边缘用户，通过次边缘用户传输数据给所述RRU；Step 3-1-3, the most edge user forwards the data to the secondary edge user, and transmits the data to the RRU through the secondary edge user;
所述暂时扣除交叉频段方式包括如下步骤：The method of temporarily deducting the cross frequency band includes the following steps:
步骤3-2-1、所述BBU根据所述业务终端上报的信道质量测量结果判断产生干扰的频段范围，即交叉频段；Step 3-2-1, the BBU judges the range of frequency bands where interference occurs according to the channel quality measurement results reported by the service terminal, that is, the cross frequency bands;
步骤3-2-2、根据小区带宽速率要求高低设置优先级的高低，所述BBU查看产生频段干扰的两个业务终端的优先级；Step 3-2-2, setting the priority level according to the bandwidth rate requirement of the cell, and the BBU checks the priority levels of the two service terminals that generate frequency band interference;
步骤3-2-3、暂时停用优先级低的小区交叉频段使用权，满足优先级高的业务终端的频段使用。Step 3-2-3. Temporarily deactivate the right to use cross frequency bands of cells with low priority to meet the frequency band usage of service terminals with high priority.
优选的，所述干扰类型为D时，对应的干扰协调方法为：所述BBU优先分配可用频段给高优先级的业务终端所属小区，另一小区的业务终端灵活选择所述高优先级的业务终端未使用的频段进行使用。Preferably, when the interference type is D, the corresponding interference coordination method is: the BBU preferentially allocates the available frequency band to the cell to which the high-priority service terminal belongs, and the service terminal of another cell flexibly selects the high-priority service Use the frequency band not used by the terminal.
优选的，所述干扰产生的原因若为两个相邻小区覆盖交叉区域出现了分时传输干扰，则利用电力业务传输特性，结合空间和时间资源，在某一时段编号为奇数的RRU进行传输，在下一时段编号为偶数的RRU进行传输。Preferably, if the cause of the interference is time-division transmission interference in the coverage intersection area of two adjacent cells, then use the power service transmission characteristics, combined with space and time resources, and RRUs with odd numbers in a certain period of time perform transmission , the RRU whose number is even numbered in the next time period transmits.
与现有技术相比，本发明的有益效果在于：Compared with prior art, the beneficial effect of the present invention is:
本发明所提出的干扰协调方法是基于资源和业务的协调方式，一方面可充分利用空间、时间、频率等资源，提高资源利用率，另外一方面，利用了电力业务的周期性传输特点，通过调整业务周期等方式，可进一步降低小区间干扰。The interference coordination method proposed by the present invention is a coordination method based on resources and services. On the one hand, it can make full use of resources such as space, time, and frequency, and improve resource utilization. On the other hand, it utilizes the periodic transmission characteristics of power services. Adjusting the service cycle and other methods can further reduce the inter-cell interference.
本发明所提的干扰协调方法中的频率子集划分采用了动态的划分方式，一方面，可根据业务使用情况，及时调整频率，提高频率利用率，另一方面，可及时调整受干扰较大的频段，保证通信信道质量。The division of frequency subsets in the interference coordination method proposed in the present invention adopts a dynamic division method. On the one hand, the frequency can be adjusted in time according to the service usage to improve the frequency utilization rate. On the other hand, it can be adjusted in time. The frequency band ensures the communication channel quality.
附图说明Description of drawings
图1是本发明提供的一种面向电力输电场景的4G专网网络结构示意图Figure 1 is a schematic diagram of a 4G private network network structure oriented to power transmission scenarios provided by the present invention
图2是本发明提供的一种面向电力输电场景的4G专网小区干扰协调方法流程图Fig. 2 is a flow chart of a 4G private network cell interference coordination method for power transmission scenarios provided by the present invention
具体实施方式detailed description
下面结合附图对本发明作进一步详细说明。The present invention will be described in further detail below in conjunction with the accompanying drawings.
如图1所示，一种面向电力输电场景的4G专网网络架构，包括基站和业务终端，基站采用分布式基站方式部署，包括中心单元BBU和若干远端RRU，BBU放置在变电站内，RRU放置在输电杆塔上，两者之间通过电力特种光缆连接，RRU之间采集级联的方式连接，且使用透明传输的方式传输，也即某RRU出现故障不会对其他RRU产生影响，RRU与业务终端之间通过申请的电力专用频段连接，业务终端连接输电线路上的各类传感器，业务终端和传感器之间可通过wifi、串口、网口等传输方式连接，且业务终端具有多跳功能，以数据业务为主，每个RRU覆盖的区域为一个小区。As shown in Figure 1, a 4G private network architecture for power transmission scenarios includes base stations and service terminals. The base stations are deployed in a distributed manner, including the central unit BBU and several remote RRUs. The BBUs are placed in the substation and the RRUs Placed on the power transmission tower, the two are connected by a special electric optical cable, and the RRUs are connected in a cascaded manner, and are transmitted in a transparent transmission mode, that is, a failure of one RRU will not affect other RRUs, and the RRU and The business terminals are connected through the applied power dedicated frequency band, and the business terminals are connected to various sensors on the transmission line. The business terminals and sensors can be connected through wifi, serial ports, network ports and other transmission methods, and the business terminals have multi-hop functions. Based on data services, the area covered by each RRU is a cell.
本发明所提到的小区间干扰，是指两个相邻RRU由于交叉覆盖而产生的干扰，所交叉区域对区域内的用户(业务终端)产生干扰。虽然常规条件下，电力输电杆塔之间距离通常在300-400米左右，通过网络规划、功率控制等手段，可以缩小或消除相邻RRU间的干扰，但是为了提高整个网络的鲁棒性，相邻小区要实现连续网络覆盖，也即存在交叉。如图1所示，图中的RRU1出现问题，其边缘的业务终端可以通过功率控制等手段连接到RRU2中，保证数据可靠传输。The inter-cell interference mentioned in the present invention refers to the interference generated by two adjacent RRUs due to cross coverage, and the crossed area generates interference to users (service terminals) in the area. Although under normal conditions, the distance between power transmission poles and towers is usually about 300-400 meters, the interference between adjacent RRUs can be reduced or eliminated through network planning, power control and other means, but in order to improve the robustness of the entire network, it is necessary to Neighboring cells need to achieve continuous network coverage, that is, there is crossover. As shown in Figure 1, if there is a problem with RRU1 in the figure, service terminals at its edge can be connected to RRU2 through power control and other means to ensure reliable data transmission.
现有的干扰协调方法中，有提前预留保护频段的方式来降低干扰，而且电力业务位置固定、数据量较固定，也可以采用预留频段的方式。但是，无线环境是动态变化的，不同时段不同位置，频率衰落是不同的，干扰也是不同的，为提高灵活性，频率分配应该是动态调整的，而且固定分配不利于提高频谱资源利用率，这对电力行业本身就缺少频率资源是个挑战。In the existing interference coordination method, there is a method of reserving a protection frequency band in advance to reduce interference, and the location of the power service is fixed, and the amount of data is relatively fixed, and the method of reserving a frequency band can also be used. However, the wireless environment is dynamically changing. Frequency fading and interference are different at different times and locations. To improve flexibility, frequency allocation should be dynamically adjusted, and fixed allocation is not conducive to improving spectrum resource utilization. The lack of frequency resources in the power industry itself is a challenge.
结合电力特点，本发明提出的干扰协调是基于资源和业务的干扰协调，所述的可利用资源包括空间资源、时间资源和频率资源，所述的可利用的业务特性主要指电力特有业务特性，包括业务周期、业务带宽、业务QoS等。Combined with the characteristics of electric power, the interference coordination proposed by the present invention is interference coordination based on resources and services. The available resources include space resources, time resources and frequency resources. The available service characteristics mainly refer to the specific service characteristics of electric power. Including service cycle, service bandwidth, service QoS, etc.
如图2所示，一种面向电力输电场景的4G专网小区干扰协调方法，所述方法包括如下步骤：As shown in Figure 2, a 4G private network cell interference coordination method for power transmission scenarios, the method includes the following steps:
(1)4G专网网络架构中的基站对可用频率资源进行分集初始化；(1) The base station in the 4G private network network architecture performs diversity initialization on the available frequency resources;
(2)所述基站获取与业务终端之间的通信信道的信道状况，分析干扰产生的原因和干扰的类型；(2) The base station acquires the channel status of the communication channel with the service terminal, and analyzes the cause of the interference and the type of the interference;
(3)根据干扰类型，结合可用资源和业务需求的现状，选取对应的干扰协调方法。(3) Select a corresponding interference coordination method according to the type of interference, combined with the current situation of available resources and service requirements.
所述信道状况主要是信道的干扰情况，具体体现参数有误码率、时延、重传次数等，终端进行信道质量检测，终端和基站进行上行通信时，基站就可以获取这些信息，基站本身也可以对信道质量进行检测。The channel status is mainly the interference of the channel, and the specific parameters include bit error rate, delay, retransmission times, etc., the terminal performs channel quality detection, and when the terminal and the base station perform uplink communication, the base station can obtain this information, and the base station itself Channel quality can also be detected.
当小区间存在干扰需要协调时，本发明提出两种方法来协调。第一种是分时传输，因为输电类的业务以周期性数据传输为主(以小时或天为单位)，与公网通信不同，绝大部分时间不存在随时接入随时传输的需求，所以可以利用空间和时间资源，在某一时段编号为奇数的RRU进行传输，在下一时段编号为偶数的RRU进行传输，因为4G网络工作频段较高，在城区内的覆盖范围通常在几百米范围内，在野外输电场景，干扰较小，覆盖范围可达几公里，相邻奇数的RRU之间又存在多个杆塔，相距距离较长，所以干扰较小。这种方法可有效降低干扰，但牺牲了业务突发的实时性需求。鉴于此情况，本发明提出了第二种协调方法，主要针对不同小区同时存在传输业务数据的需求的情况。主要内容如下：When there is interference between cells and coordination is required, the present invention proposes two methods for coordination. The first is time-sharing transmission, because power transmission services are mainly based on periodic data transmission (in hours or days), and unlike public network communications, there is no need to access and transmit at any time most of the time, so Space and time resources can be used to transmit with odd-numbered RRUs in a certain period of time and even-numbered RRUs in the next period of time. Because the 4G network has a relatively high operating frequency band, the coverage in urban areas is usually within a few hundred meters. In the field power transmission scene, the interference is small, and the coverage can reach several kilometers. There are multiple towers between adjacent odd-numbered RRUs, and the distance is relatively long, so the interference is small. This method can effectively reduce interference, but sacrifices the real-time requirements of business bursts. In view of this situation, the present invention proposes a second coordination method, which is mainly aimed at the situation that different cells have requirements for transmitting service data at the same time. The main contents are as follows:
将可用频率资源分为两个动态频率子集，一个子集给小区的中心用户使用，另外一个子集给小区的边缘用户使用。子集里的可用频带根据业务需求和干扰管理需求进行随时调整，中心用户和边缘用户的划分依据是距离，也即业务终端与RRU间的距离。子集的划分主要根据用户的需求来划分，如果中心用户没有传输需求，而边缘用户有传输需求，就可将频率资源都划分给边缘用户，中心用户只需与RRU保持连接即可，如果两类用户都有传输需求，根据业务的优先级来调整频率子集，同一优先级公平对等分配。The available frequency resources are divided into two dynamic frequency subsets, one subset is used by the center users of the cell, and the other subset is used by the edge users of the cell. The available frequency bands in the subset are adjusted at any time according to service requirements and interference management requirements. The division between central users and edge users is based on distance, that is, the distance between service terminals and RRUs. The division of subsets is mainly divided according to the needs of users. If the central user has no transmission needs and the edge users have transmission needs, the frequency resources can be allocated to the edge users. The central user only needs to maintain the connection with the RRU. If the two Class users have transmission requirements, adjust the frequency subset according to the priority of the business, and allocate the same priority fairly and equally.
小区间出现干扰时，也即两个相邻小区覆盖交叉区域出现了边缘用户同时传输需求，产生了干扰，需要进行协调，具体来说还要分几种情况：When there is interference between cells, that is, the simultaneous transmission requirements of edge users appear in the coverage intersection area of two adjacent cells, and interference occurs, which requires coordination. Specifically, there are several situations:
第一种是RRU1的中心用户同时传输数据，RRU2的中心用户不传输数据，第二种是RRU1的中心用户同时传输数据，RRU2的中心用户也同时传输数据，第三种是RRU1的中心用户不传输数据，RRU2的中心用户同时传输数据，第四种是两个小区的中心用户都不传输数据。The first is that the central user of RRU1 transmits data at the same time, and the central user of RRU2 does not transmit data. The second is that the central user of RRU1 transmits data at the same time, and the central user of RRU2 also transmits data at the same time. The third is that the central user of RRU1 does not transmit data. For data transmission, the central user of RRU2 transmits data at the same time, and the fourth type is that the central users of the two cells do not transmit data.
针对不同的方案，具有不同的解决办法。There are different solutions for different scenarios.
对于第一种情况和第三种类似，所用方法一样，也即相邻小区中，有一小区，所有业务存在同时传输的需求，另一小区只存在边缘用户的需求，为降低小区间干扰，希望边缘用户之间交叉的频带越少越好。由于其中一小区只有边缘用户传输需求，所以频带可用的范围就较大，可以根据满载的小区的边缘用户频段使用情况进行灵活调整，也即未满载小区的边缘用户选取与满载小区边缘用户不交叉的频段使用，原则上选取满载小区中心用户使用的频段进行使用，以降低干扰。因为小区的频率资源都是由BBU进行分配的，所以BBU知道各小区的频率使用情况，对相邻小区的边缘用户的使用频率进行合理分配，能够有效避免干扰，另外，在频率分配过程中还要考虑到不同业务的接入优先级，这是由电力业务特殊性决定的。The first case is similar to the third case, and the method used is the same, that is, one of the adjacent cells requires simultaneous transmission of all services, and the other cell only requires marginal users. In order to reduce inter-cell interference, it is hoped that The fewer frequency bands crossed between edge users, the better. Since one of the cells has only the transmission needs of edge users, the available frequency range is relatively large, and can be flexibly adjusted according to the usage of the edge user frequency band of the fully loaded cell, that is, the edge user selection of the unfulfilled cell does not overlap with the edge user of the fully loaded cell In principle, the frequency band used by the users in the center of the fully loaded cell is selected for use to reduce interference. Because the frequency resources of the cell are all allocated by the BBU, the BBU knows the frequency usage of each cell, and reasonably allocates the frequency used by the edge users of the adjacent cell, which can effectively avoid interference. In addition, in the frequency allocation process The access priority of different services should be considered, which is determined by the particularity of the power service.
对于第二种情况，是最复杂的干扰情况，不同小区同时传输，小区内的用户也同时传输，考虑最不利的场景，如果高优先级的业务终端在小区边缘，优先分配边缘频段，且边缘用户的需求带宽又比较大，需分配更多的频带，和邻小区产生干扰的可能性就更大，此时，通过两种方法来解决，第一种，是通过多跳的方式，首先是最边缘用户和次边缘用户根据无线传输环境进行多跳传输连接协商，两者根据协商结果调整使用频段、数据调制类型、发射功率等参数，然后是两者之间建立相应的数据传输通道，最后，最边缘用户转发数据给次边缘用户，通过次边缘用户传输数据给RRU。详细来说，将最边缘的用户的业务分流一部分给次边缘用户，两者之间可通过多跳的无线方式连接，由于两者距离较近，调整数据调制方式，由低阶调制转换为高阶调制，可使用高阶调制的方法，比如，起始阶段，最边缘用户和RRU通信，因为距离长，信道条件差的可能较大，可能采用16QAM的调制方式，而与相邻用户通信时，通信距离缩短，可采用64QAM的调制方式，在满足传输速率的要求下，可降低带宽需求，进而减少可用频段，与相邻用户的交叉频段减少，干扰程度降低，同时，因为和邻节点多跳，传输距离变短，可降低发射功率，也降低了干扰强度。第二种，是暂时扣除交叉频段的方法，首先BBU根据业务终端上报的信道质量测量结果判断产生干扰的频段范围(也即交叉频段)，然后BBU查看产生频段干扰的两个业务终端的优先级，然后暂时停用低等级小区交叉频段使用权，满足高等级业务终端的频段使用。比如，由BBU暂时扣除一小区的频段子集，带宽速率要求低的小区优先扣除，如果速率要求一致，使用时分的方式扣除，也即相同机会使用交叉频段。For the second case, which is the most complicated interference situation, different cells transmit at the same time, and users in the cell also transmit at the same time. Considering the most unfavorable scenario, if the high-priority service terminal is at the edge of the cell, the edge frequency band is allocated preferentially, and the edge The bandwidth required by the user is relatively large, more frequency bands need to be allocated, and the possibility of interference with neighboring cells is greater. At this time, there are two methods to solve the problem. The first is to use multi-hop. According to the wireless transmission environment, the most marginal user and the secondary marginal user conduct multi-hop transmission connection negotiation. According to the negotiation results, the two adjust the frequency band, data modulation type, transmission power and other parameters, and then establish the corresponding data transmission channel between the two, and finally , the most edge user forwards data to the secondary edge user, and transmits data to the RRU through the secondary edge user. In detail, part of the business of the most marginal users is distributed to the secondary marginal users, and the two can be connected by multi-hop wireless mode. Since the distance between the two is relatively close, the data modulation method is adjusted from low-order modulation to high Higher-order modulation can be used. For example, in the initial stage, the most marginal user communicates with the RRU. Because the distance is long and the channel condition may be poor, the 16QAM modulation method may be used. When communicating with adjacent users , the communication distance is shortened, and the 64QAM modulation method can be used. Under the condition of meeting the requirements of the transmission rate, the bandwidth requirement can be reduced, thereby reducing the available frequency band, reducing the cross frequency band with adjacent users, and reducing the degree of interference. At the same time, because there are many adjacent nodes jump, the transmission distance is shortened, the transmission power can be reduced, and the interference intensity is also reduced. The second method is to temporarily deduct the cross-band. First, the BBU judges the range of frequency bands that cause interference (that is, the cross-band) according to the channel quality measurement results reported by the service terminals, and then the BBU checks the priorities of the two service terminals that generate frequency band interference. , and then temporarily disable the right to use cross-bands of low-level cells to meet the frequency band usage of high-level service terminals. For example, the BBU temporarily deducts a subset of the frequency bands of a cell, and the cells with low bandwidth rate requirements are preferentially deducted. If the rate requirements are consistent, the time-division method is used to deduct, that is, the same opportunity to use cross-bands.
第四种是最简单的干扰情况，只有边缘用户传输数据，两个小区内的边缘用户可用频段都比较多，由BBU根据可用频带和业务需求进行灵活分配来避免小区间干扰，BBU优先分配可用频段给高优先级的业务终端所属小区，另一小区的业务终端可以灵活选择高优先级的业务终端未使用的频段进行使用。The fourth is the simplest interference situation. Only edge users transmit data. There are many available frequency bands for edge users in the two cells. The BBU flexibly allocates them according to the available frequency bands and service requirements to avoid inter-cell interference. The BBU is available for priority allocation. The frequency band is assigned to the cell to which the high-priority service terminal belongs, and the service terminal in another cell can flexibly select a frequency band not used by the high-priority service terminal for use.
最后应当说明的是：以上实施例仅用以说明本发明的技术方案而非对其限制，尽管参照上述实施例对本发明进行了详细的说明，所属领域的普通技术人员应当理解：依然可以对本发明的具体实施方式进行修改或者等同替换，而未脱离本发明精神和范围的任何修改或者等同替换，其均应涵盖在本发明的权利要求范围当中。Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the scope of the claims of the present invention.
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| CN201510686132.9ACN105391510B (en) | 2015-10-21 | 2015-10-21 | A kind of 4G private network method for cell interference coordination towards electric power transmission scene |
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| CN201510686132.9ACN105391510B (en) | 2015-10-21 | 2015-10-21 | A kind of 4G private network method for cell interference coordination towards electric power transmission scene |
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| CN201510686132.9AActiveCN105391510B (en) | 2015-10-21 | 2015-10-21 | A kind of 4G private network method for cell interference coordination towards electric power transmission scene |
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