CN108770034A - The low energy consumption multicasting method of multicast cluster is used in a kind of wireless cellular network - Google Patents
The low energy consumption multicasting method of multicast cluster is used in a kind of wireless cellular network Download PDFInfo
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Abstract
Description
技术领域technical field
本发明涉及一种无线蜂窝网中用于多播簇的低能耗多播方法，该方法适用于无线蜂窝网中多播接收节点位于一个小区域时从基站到接收节点的数据多播。The invention relates to a low-energy multicast method for multicast clusters in a wireless cellular network. The method is suitable for data multicasting from a base station to a receiving node when the multicast receiving node is located in a small area in the wireless cellular network.
背景技术Background technique
随着通信技术的进步，移动无线网络的用户规模急剧增加，这导致了无线蜂窝网中数据流量的急剧增加，对蜂窝网中的基站造成了巨大的压力。With the advancement of communication technology, the user scale of mobile wireless network has increased sharply, which has led to a sharp increase in data traffic in wireless cellular networks, and has caused enormous pressure on base stations in cellular networks.
在无线蜂窝网络中，经常有一些用户请求相同的数据，比如最新的信息发布和文件分发，因此组播流量占总流量的很大一部分。在无线蜂窝网络的可靠多播方案中，基站重复发送相同的数据包，直到它被所有接收者接收，导致基站承担较大的组播业务负载和节点端大量的接收能耗。In a wireless cellular network, some users often request the same data, such as the latest information release and file distribution, so multicast traffic accounts for a large part of the total traffic. In the reliable multicast scheme of wireless cellular networks, the base station repeatedly sends the same data packet until it is received by all receivers, resulting in a large load of multicast traffic on the base station and a large amount of receiving energy consumption at the node end.
作为下一代移动通信中一种能有效减轻基站负载的技术，无线蜂窝网中的设备到设备通信(简称为D2D通信)在近几年受到了科研界和产业界的极大重视。因此设计基于D2D通信的多播方法具有非常重要的意义。从多播用户的物理位置分布该角度，多播场景可分为以下两类：(1)从BS多播数据到散布在整个蜂窝小区的用户；(2)从BS多播数据到某个小区域(如一幢办公楼)内多个用户，这些用户两两邻近，称这些两两邻近、可以相互进行D2D通信的多播用户组成一个D2D多播簇。As a technology that can effectively reduce the load of base stations in the next generation of mobile communications, device-to-device communication in wireless cellular networks (referred to as D2D communication) has received great attention from the scientific research community and the industry in recent years. Therefore, it is of great significance to design a multicast method based on D2D communication. From the perspective of the physical location distribution of multicast users, multicast scenarios can be divided into the following two categories: (1) multicast data from BS to users scattered throughout the cell; (2) multicast data from BS to a small There are multiple users in an area (such as an office building), and these users are adjacent to each other in pairs. These multicast users who are adjacent to each other and can perform D2D communication with each other form a D2D multicast cluster.
目前已有的用于D2D多播簇的多播方法没有考虑到节点的能耗问题，而能耗是无线网络中需要考虑到的一个非常重要的性能指标。没有考虑到节点能耗的多播方法将导致相对较高的节点端能耗。Existing multicast methods for D2D multicast clusters do not take into account the energy consumption of nodes, which is a very important performance index that needs to be considered in wireless networks. A multicast approach that does not take node energy consumption into account will result in relatively high node-side energy consumption.
发明内容Contents of the invention
为了克服现有的用于D2D多播簇的多播方法会导致较高的节点端能耗问题，本发明提出了一种无线蜂窝网中用于多播簇的低能耗多播方法，该方法联合优化D2D多播簇内中继节点的选取以及发送功率的选取，来达到较低的节点总能耗。In order to overcome the problem that the existing multicast method for D2D multicast clusters will lead to high energy consumption at the node end, the present invention proposes a low-energy multicast method for multicast clusters in a wireless cellular network, the method Jointly optimize the selection of relay nodes in the D2D multicast cluster and the selection of transmission power to achieve lower total energy consumption of nodes.
为了解决上述技术问题，本发明提供如下的技术方案：In order to solve the above technical problems, the present invention provides the following technical solutions:
一种无线蜂窝网中用于多播簇的低能耗多播方法，该方法包括以下步骤：A low-energy multicast method for multicast clusters in a wireless cellular network, the method comprising the following steps:
1)对于由N个两两邻近的接收节点组成的多播簇，对于i＝1,2,…,N,根据公式(1)计算接收节点i从基站正确接收一个数据包的期望接收能耗 1) For a multicast cluster composed of N pairwise adjacent receiving nodes, for i=1, 2,..., N, calculate the expected receiving energy consumption of receiving node i correctly receiving a data packet from the base station according to formula (1)
其中，Pi B是基站到中继节点i的无线信道数据包接收率，erx是节点接收一个数据包所需要的能耗；Among them, P i B is the wireless channel data packet reception rate from the base station to the relay node i, and e rx is the energy consumption required by the node to receive a data packet;
2)表示节点i作为中继节点并以第k档发送功率发送数据包时每个包的期望发送次数，k∈{1,2,...,K},K是节点可用的发送功率的档数，2) Indicates the expected number of times each packet is sent when node i acts as a relay node and sends data packets at the kth level of transmission power, k∈{1,2,...,K}, K is the number of levels of transmission power available to the node ,
对于每对i∈{1,2,…,N}和k∈{1,2,...,K}的联合取值，用以下公式(2)计算出 For each joint value of i∈{1,2,…,N} and k∈{1,2,…,K}, use the following formula (2) to calculate
其中，I＝{1,2,...,N}，是当节点i用第k档功率给节点j发送数据包时的包接收率；where, I={1,2,...,N}, is the packet reception rate when node i sends data packets to node j with the k-th gear power;
3)对于i＝1,2,…,N,根据公式(3)计算出节点i以第k档发送功率给其它接收节点发送一个数据包时所有其它接收节点的期望总接收能耗为3) For i=1,2,...,N, according to the formula (3), calculate the expected total energy consumption of all other receiving nodes when node i sends a data packet to other receiving nodes with the k-th transmission power as
4)对于每对i∈{1,2,…,N}和k∈{1,2,...,K}的联合取值,根据公式(4)计算出节点i作为中继节点并以第k档发送功率来转发数据包时所有节点正确接收一个数据包的期望总能耗 4) For each joint value of i∈{1,2,…,N} and k∈{1,2,…,K}, calculate node i as relay node according to formula (4) and use The expected total energy consumption of all nodes correctly receiving a data packet when the k-th transmission power is used to forward the data packet
其中，表示节点以第k档发送功率发送一个数据包所需要的发送能耗；in, Indicates the transmission energy consumption required by the node to transmit a data packet with the k-th transmission power;
5)在所有i∈{1,2,…,N}和k∈{1,2,...,K}的联合取值中，挑出具有最小值的节点i和发送功率档k来作为中继节点和它的发送功率；5) Among all joint values of i∈{1,2,…,N} and k∈{1,2,…,K}, pick the one with the smallest The value of node i and transmission power level k is used as a relay node and its transmission power;
6)对于基站要多播给节点的每个数据包，先由基站向中继节点i反复发送该数据包直到中继节点i正确接收到该包，再由中继节点i以上一步所确定的发送功率来反复发送该数据包直到所有其它接收节点正确接收到该包。6) For each data packet that the base station wants to multicast to the node, the base station sends the data packet repeatedly to the relay node i until the relay node i correctly receives the packet, and then the relay node i determines the data packet in the previous step Send power to repeatedly send the packet until all other receiving nodes receive the packet correctly.
本发明的有益效果为：本发明联合优化D2D多播簇内中继节点的选取以及发送功率的选取，使得D2D多播簇内所有节点的总能耗达到最小化，达到节能的效果。The beneficial effects of the present invention are: the present invention jointly optimizes the selection of relay nodes and the selection of transmission power in the D2D multicast cluster, so that the total energy consumption of all nodes in the D2D multicast cluster can be minimized and energy saving can be achieved.
附图说明Description of drawings
图1是无线蜂窝网中基于设备到设备通信的多播示意图。FIG. 1 is a schematic diagram of multicast based on device-to-device communication in a wireless cellular network.
具体实施方式Detailed ways
下面结合附图对本发明做进一步说明。The present invention will be further described below in conjunction with the accompanying drawings.
参照图1，一种无线蜂窝网中用于多播簇的低能耗多播方法，该方法包括以下步骤：With reference to Fig. 1, a kind of low energy consumption multicast method for multicast cluster in wireless cellular network, this method comprises the following steps:
1)对于由N个两两邻近的接收节点组成的多播簇，对于i＝1,2,…,N,根据公式(1)计算接收节点i从基站正确接收一个数据包的期望接收能耗 1) For a multicast cluster composed of N pairwise adjacent receiving nodes, for i=1, 2,..., N, calculate the expected receiving energy consumption of receiving node i correctly receiving a data packet from the base station according to formula (1)
其中，Pi B是基站到中继节点i的无线信道数据包接收率，erx是节点接收一个数据包所需要的能耗；Among them, P i B is the wireless channel data packet reception rate from the base station to the relay node i, and e rx is the energy consumption required by the node to receive a data packet;
2)表示节点i作为中继节点并以第k档发送功率发送数据包时每个包的期望发送次数，k∈{1,2,...,K},K是节点可用的发送功率的档数，对于每对i∈{1,2,…,N}和k∈{1,2,...,K}的联合取值，用以下公式(2)计算出 2) Indicates the expected number of times each packet is sent when node i acts as a relay node and sends data packets at the kth level of transmission power, k∈{1,2,...,K}, K is the number of levels of transmission power available to the node , for each joint value of i∈{1,2,…,N} and k∈{1,2,…,K}, use the following formula (2) to calculate
其中，I＝{1,2,...,N}，是当节点i用第k档功率给节点j发送数据包时的包接收率；where, I={1,2,...,N}, is the packet reception rate when node i sends data packets to node j with the k-th gear power;
3)对于i＝1,2,…,N,根据公式(3)计算出节点i以第k档发送功率给其它接收节点发送一个数据包时所有其它接收节点的期望总接收能耗为3) For i=1,2,...,N, according to the formula (3), calculate the expected total energy consumption of all other receiving nodes when node i sends a data packet to other receiving nodes with the k-th transmission power as
4)对于每对i∈{1,2,…,N}和k∈{1,2,...,K}的联合取值,根据公式(4)计算出节点i作为中继节点并以第k档发送功率来转发数据包时所有节点正确接收一个数据包的期望总能耗 4) For each joint value of i∈{1,2,…,N} and k∈{1,2,…,K}, calculate node i as relay node according to formula (4) and use The expected total energy consumption of all nodes correctly receiving a data packet when the k-th transmission power is used to forward the data packet
其中，表示节点以第k档发送功率发送一个数据包所需要的发送能耗；in, Indicates the transmission energy consumption required by the node to transmit a data packet with the k-th transmission power;
5)在所有i∈{1,2,…,N}和k∈{1,2,...,K}的联合取值中，挑出具有最小值的节点i和发送功率档k来作为中继节点和它的发送功率；5) Among all joint values of i∈{1,2,…,N} and k∈{1,2,…,K}, pick the one with the smallest The value of node i and transmission power level k is used as a relay node and its transmission power;
6)对于基站要多播给节点的每个数据包，先由基站向中继节点i反复发送该数据包直到中继节点i正确接收到该包，再由中继节点i以上一步所确定的发送功率来反复发送该数据包直到所有其它接收节点正确接收到该包。6) For each data packet that the base station wants to multicast to the node, the base station sends the data packet repeatedly to the relay node i until the relay node i correctly receives the packet, and then the relay node i determines the data packet in the previous step Send power to repeatedly send the packet until all other receiving nodes receive the packet correctly.
针对N个节点组成的多播簇，已知蜂窝下行链路包接收率、节点间在不同发送功率档下的包接收率、节点以第k档发送功率发送一个数据包所需要的发送能耗节点接收一个数据包所需要的能耗erx，说明本发明的具体实施方案。For a multicast cluster composed of N nodes, the cellular downlink packet reception rate, the packet reception rate between nodes at different transmission power levels, and the transmission energy required for a node to send a data packet at the k-th level of transmission power are known. The energy consumption e rx required by a node to receive a data packet illustrates the specific implementation of the present invention.
首先，对于i＝1,2,…,N，计算节点i从基站反复接收一个数据包直到成功接收到该包所需要的接收能耗期望值 Firstly, for i=1,2,...,N, calculate the expected value of receiving energy consumption required by node i to repeatedly receive a data packet from the base station until the packet is successfully received
然后，对于每对i∈{1,2,…,N}和k∈{1,2,...,K}的联合取值,计算出节点i作为中继节点并以第k档发送功率发送数据包时每个包的期望发送次数 Then, for each joint value of i∈{1,2,…,N} and k∈{1,2,…,K}, calculate node i as relay node and transmit power The expected number of sends per packet when sending packets
接着，对于i＝1,2,…,N,计算出节点i以第k档发送功率给其它接收节点发送一个数据包时所有其它接收节点的期望总接收能耗 Next, for i=1,2,...,N, calculate the expected total receiving energy consumption of all other receiving nodes when node i sends a data packet to other receiving nodes with the k-th transmission power
在所有i∈{1,2,…,N}和k∈{1,2,...,K}的联合取值中,挑出具有最小值的节点i和发送功率档k来作为中继节点和它的发送功率。Among all the joint values of i∈{1,2,…,N} and k∈{1,2,…,K}, pick the one with the smallest The value of node i and transmission power level k is used as the relay node and its transmission power.
对于基站要多播给节点的每个数据包，先由基站向中继节点i反复发送该数据包直到中继节点i正确接收到该包，再由中继节点i以所确定的发送功率来反复发送该数据包直到所有其它接收节点正确接收到该包。For each data packet that the base station wants to multicast to the node, the base station sends the data packet repeatedly to the relay node i until the relay node i receives the packet correctly, and then the relay node i sends the data packet with the determined transmission power The data packet is sent repeatedly until all other receiving nodes receive the packet correctly.
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