CN102970758B - Straight-through self-adaptive resource distribution method for cellular communication system terminal - Google Patents

Straight-through self-adaptive resource distribution method for cellular communication system terminal Download PDF

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CN102970758B
CN102970758B CN 201210532291 CN201210532291A CN102970758B CN 102970758 B CN102970758 B CN 102970758B CN 201210532291 CN201210532291 CN 201210532291 CN 201210532291 A CN201210532291 A CN 201210532291A CN 102970758 B CN102970758 B CN 102970758B
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d2d
user
channel gain
cellular
resource allocation
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CN102970758A (en )
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蒋雁翔
刘强
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东南大学
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蜂窝通信系统终端直通自适应资源分配方法是一种基于正交频分复用系统下的D2D(device-to-device)通信的资源分配方法。 Adaptive Resource Allocation cellular communication system terminal through a resource allocation method in D2D multiplexing system (device-to-device) communication based on an orthogonal frequency division. 基于D2D用户发射功率小的特点考虑了两组D2D对复用相同资源的情况,在为D2D对分配蜂窝用户资源时同时考虑路径衰落、蜂窝用户对D2D用户的干扰信道增益、D2D用户间的信道增益,从而自适应地为匹配的D2D对分配等效信道增益最大的资源以实现吞吐量最大化。 Based on small D2D user transmit power characteristics considered two D2D case where reuse the same resources in the D2D for allocating a cellular subscriber resources taking into account the fading, the channel between the cellular user interference channel gain D2D user, D2D user gain, thereby adaptively matched for D2D resource allocation maximum equivalent channel gain to maximize throughput. 优点是能够极大的提高D2D系统容量,而且算法相对简单。 The advantage is D2D can greatly improve system capacity, and the algorithm is relatively simple.

Description

蜂窝通信系统终端直通自适应资源分配方法 Cellular communication system terminal through adaptive resource allocation method

技术领域 FIELD

[0001] 本发明是一种基于正交频分复用系统下的D2D(device-to-device)通信的资源分配方法,属于移动通信中的资源分配技术领域。 [0001] The present invention is a resource allocation method based on the D2D multiplexing system (device-to-device) communication orthogonal frequency division, resource allocation techniques belonging to the field of mobile communication.

背景技术 Background technique

[0002] 资源分配是移动通信系统能正常通信的关键。 [0002] resource allocation is a key to a mobile communication system to normal communication. 由于可用于移动通信的频谱资源十分有限,就需要更加高效的利用频谱资源,D2D技术应运而生。 Since the spectrum resources available for mobile communication is very limited, we need more efficient use of spectrum resources, D2D technology came into being. 从现在的D2D资源分配方法来看,大多数方法都是每组D2D对复用都复用不同的蜂窝用户的频谱资源,几乎没有提到两组或多组D2D对复用相同蜂窝用户资源的方法,而采用两组或多组D2D对复用相同的蜂窝用户资源可以极大的提高频谱效率;同时在为D2D对选择复用的资源时可以不局限于单个蜂窝用户的所有资源,这些资源中可能有好有坏,如果全部复用可能对D2D通信造成限制。 From now D2D resource allocation method, the majority of each D2D methods are multiplexed is multiplexed with a different cellular users spectrum resources, almost no mention of the same cell multiplexing two or more sets of user resources D2D methods, while the use of two or more sets D2D greatly improved spectrum efficiency of cellular users the same resources may be multiplexed; simultaneously in the selection of the D2D resource reuse may not be limited to all the resources of a single cellular user, these resources there may be good and bad, if all the multiplexing may result in restrictions on the D2D communication. 所以从各个蜂窝用户选出对于D2D用户好的资源来进行复用,即以子载波来考虑为出发点而不是以蜂窝用户能更好的利用信道的频率选择行和多用户的分集增益。 Therefore, the cellular user to select from various good resources for D2D user multiplexed, i.e. subcarrier considered as the starting point instead of the cellular user to better use the frequency channel selected row and multi-user diversity gain. 在资源分配的时候我们采用一种自适应的子载波分配方法,即将每个子载波都分配给在在其上面等效信道增益最大的用户,这里的等效信道是将D2D间的信道、干扰信道、干扰功率统一考虑所得到的。 When the resource allocation, we use an adaptive subcarrier allocation method, i.e. each subcarrier is assigned to it above the equivalent channel gain maximum user in, where the equivalent channel is the channel between the D2D, interference channel interference power integrated consideration obtained. 基于上述内容从而很大程度的提高了D2D系统容量。 Thereby increasing the D2D system capacity to a large extent based on the above.

发明内容 SUMMARY

[0003] 技术问题:本发明的目的是提供一种蜂窝通信系统终端直通自适应资源分配方法,主要针对数量较多的D2D对要进行资源分配的情况,降低蜂窝用户对D2D用户的干扰, 极大的提高D2D系统的系统容量和频谱利用率。 [0003] Technical Problem: The purpose of the present invention to provide a cellular communication system terminal through adaptive resource allocation method, mainly for the case where a larger number of D2D to resource allocation, reducing interference to cellular users D2D user, pole system capacity and spectrum efficiency greatly improved D2D system.

[0004] 技术方法:本发明的蜂窝通信系统终端直通自适应资源分配方法为: [0004] art methods: a cellular communication system according to the present invention is a terminal through adaptive resource allocation method:

[0005] 1)、根据距离区域将小区分为内环和外环(在外环采用D2D模式能获得更好性能); [0005] 1) The cells from the area into inner and outer rings (outer ring using the D2D mode can obtain better performance);

[0006] 2)、将外环分为偶数个相等的区域,正对圆心的两个区域确定为匹配的一组区域; [0006] 2), the outer ring into an even number of equal areas, two regions facing the center is determined as a matched set of regions;

[0007] 3)、在匹配的两个区域内分别随机找一对D2D对作为匹配的一组D2D对,如图2 ; [0007] 3), in the two regions were randomly find a matched pair serving as a set of D2D D2D matched pair, as shown in FIG 2;

[0008] 4)、基站根据当前时刻蜂窝用户对D2D对用户的干扰信道增益、路径衰落和D2D用户间的信道增益计算D2D用户间的等效信道增益=ph\,其中Hd为D2D用户间的等rI-CiD nCiD 效信道增益,hd为D2D用户间的实际信道增益,P1,aD为蜂窝用户对D2D用户的干扰功率,haD为蜂窝用户与D2D用户间的干扰信道增益; [0008] 4), the base station gain calculating an equivalent channel gain between D2D user = ph according to the channel between the current time cellular user D2D interference channel gain of users, fading, and D2D user \, where Hd is between D2D user rI-CiD nCiD other effective channel gain, hd is the actual channel gain between user D2D, P1, aD cellular users D2D user interference power, HAD interference channel gain between user and D2D cellular user;

[0009] 5)、令N,V用来表示每组D2D对分配的子载波数量和等效信道增益,其初始值设为〇; [0009] 5), so that N, V ​​represents for each group and the number of subcarriers D2D equivalent channel gain distribution, the initial value is set to square;

[0010] 6)、对于所有可分配的子载波依次为其选择在该子载波上平均等效信道增益最大的一组匹配的D2D对,将该子载波分配给这组匹配的D2D对,并将N所对应的项加1直到其满足所要求的子载波数,则不再为其分配子载波,并用V记录分配到的等效信道增益; [0011] 7)、重复步骤6)直到将所有子载波分配完毕; [0010] 6), for all subcarriers allocated for sequentially selecting the largest average equivalent channel gain of a matching set of D2D on the subcarriers, the subcarrier allocation to the set of matched D2D, and the terms are added to the number of subcarriers 1 until it meets the requirements of the corresponding N, it is no longer assigned to the equivalent channel gain of the subcarrier, and allocates a record to V; [0011] 7) repeat step 6) until all sub-carriers have been allocated;

[0012] 这种蜂窝系统终端直通自适应配对资源分配方法通过让不同区域的D2D对匹配复用相同的蜂窝用户资源极大的提高了系统容量和频谱效率,在分配资源时以子载波来考虑避开了不好的子载波,并以等效信道来考虑更能符合提高D2D用户容量的要求。 [0012] Such a cellular system terminal through adaptive resource allocation method by pairing so that different regions of the same cellular users D2D resource matching multiplexed greatly improves the system capacity and spectral efficiency in the allocation of resources to be considered subcarriers avoid bad subcarriers, and is considered equivalent channel can better meet the requirements to improve the D2D user capacity. 其中的让两组D2D对匹配复用相同的蜂窝用户资源可以直接应用到很多为每组D2D对用户分配不同蜂窝用户资源的方法上,获得极大的性能上的增益。 Two groups wherein the matching D2D cellular users reuse the same resources can be directly applied to the method of many different cells each D2D user resources assigned to the user to obtain a great gain in performance.

[0013] 有益效果: [0013] beneficial effects:

[0014] 1、引入等效信道增益的概念,全面考虑了影响D2D系统容量的因素,避免单独考虑干扰功率、干扰信道增益,有效提高了D2D系统容量。 [0014] 1, introduce the concept of equivalent channel gain factors D2D full account of the system capacity, considered separately to avoid interference power, interference channel gain and improve the system capacity D2D.

[0015] 2、采用针对子载波为单位的资源分配,避免了将对于D2D用户条件差的频谱资源分配给D2D用户。 [0015] 2, using the resource allocation for each subcarrier, to avoid the condition for difference D2D user D2D spectrum allocation to users.

[0016] 3、采用两组不同区域的D2D对复用相同的蜂窝用户资源,控制了D2D对间干扰的同时极大的提高了D2D系统的容量和频谱效率。 [0016] 3, using two different regions of the D2D reuse the same resource cellular users, control the interference between simultaneous D2D greatly increase capacity and spectral efficiency D2D system.

[0017] 本发明提出的让两组D2D对匹配复用相同的蜂窝用户资源可以直接应用到很多为每组D2D对用户分配不同蜂窝用户资源的方法上,获得极大的性能上的增益。 [0017] The present invention is made so that the two matching D2D cellular users reuse the same resources can be directly applied to the method of many different cells each D2D user resources assigned to the user to obtain a great gain in performance.

[0018] 本发明主要考虑如何在蜂窝系统终端直通资源分配过程中降低蜂窝用户对D2D 用户的干扰,提高D2D系统容量。 [0018] The present invention in a cellular system to consider how the terminal through the resource allocation process to reduce interference to cellular users D2D user, D2D increase system capacity.

附图说明 BRIEF DESCRIPTION

[0019] 图1是系统模型图,假设采用D2D模式的用户均匀分布在小区的外环上,蜂窝用户随机分配在小区内。 [0019] FIG. 1 is a system model, using the D2D user mode is assumed uniformly distributed on the outer ring of the cell, the cellular user randomly assigned within a cell.

[0020] 图2是本发明的D2D对匹配示意图。 [0020] FIG. 2 is a D2D matching schematic of the present invention.

[0021] 图3是资源分配方法的流程图。 [0021] FIG. 3 is a flowchart of a resource allocation method.

具体实施方式 detailed description

[0022] 假设一个OFDM符号包含的子载波数为M,蜂窝用户和D2D对的数量分别为N。 [0022] Suppose the number of subcarriers contained in one OFDM symbol is M, and the number of cellular users D2D pair are N. 和Nd, D2D用户可以在基站的协调下直接进行通信,且D2D用户在通信时复用蜂窝用户的资源。 And of Nd, D2D user may communicate directly under the coordination of the base station, and user multiplexing D2D cellular subscriber communication resources.

[0023] 我们假定所有蜂窝用户到达基站的功率都控制在相同的水平Pcb,即 Power [0023] We assume that all users arrive cellular base station are controlled at the same level Pcb, i.e.

[0024] 户CJJ ,访[公式一] [0024] households CJJ, visit [a formula]

[0025] Pcb为常数,Pa为第i个蜂窝用户的发射功率,da为该蜂窝用户到基站的距离。 [0025] Pcb is a constant, Pa is the i th cell transmit power users, da for from the base station to the cellular user. 那么由蜂窝用户对D2D的干扰功率就可以写成 So by the cellular user interference power for the D2D can be written as

[0026] 尸卿=AUa '的[公式二] [0026] Qing corpse = AUa 'the [formula 2]

[0027] daD为蜂窝用户到D2D接收用户的距离,而D2D对基站的干扰功率被严格的限制在δB,即Pd · (CLrVPffl彡δB,以确保不会对基站产生干扰Pd为D2D用户的发射功率,dDB为D2D用户到基站的距离。由香农公式可得D2D用户的信道容量: [0027] daD cellular user is received from the user to the D2D, D2D and the base station interference power is strictly limited in the delta B, i.e., Pd · (CLrVPffl San delta B, in order to ensure no interference to the base station transmitting user Pd as D2D power, dDB the D2D user from the base station to the Shannon channel capacity formula available D2D user:

[0028] Cd =Iog2 (1+-尸0 (A)----)「公式二] P1'③.hClD+P美rhd,d+nnn 八瓦」 [0028] Cd = Iog2 (1 + - dead 0 (A) ----) "formula 2] P1'③.hClD + P beauty rhd, d + nnn eight watts."

[0029] PD,为复用相同蜂窝用户资源的另一对D2D用户的发射功率,hdd,为两对复用相同蜂窝用户资源的D2D用户间的信道增益,ddd,是复用相同资源的两对D2D对间的距离,nQ为噪声的单边功率谱密度。 [0029] PD, is multiplexed with the other same cellular subscriber resources for transmitting power to the D2D user, hdd, the channel gain between the two pairs of D2D users reuse the same cellular user resources, ddd, is the reuse the same resources in two the distance between the D2D pair, nQ is a unilateral noise power spectral density. 在D2D用户采用最大发射功率的条件下即Pd= (dDB)a·δΒ·Ρα, 令Pra =c·rvc为常数,则可得D2D对间的干扰功率与噪声功率的比值; D2D user uses at a maximum transmit power, i.e., Pd = (dDB) a · δΒ · Ρα, so Pra = c · rvc constant, the ratio of the interference power and noise power can be obtained between the D2D pair;

[0030] P^<d^yaJd^tάη〇·)α=(dmldDD,Y.SB-c[公式四] nQnO [0030] P ^ <d ^ yaJd ^ tάη〇 ·) α = (dmldDD, Y.SB-c [Formula four] nQnO

[0031] 而此式通过适当可行的对距离取值是很容易达到远小于1的情况的。 [0031] and this formula by appropriate and feasible distance value is easily reached far smaller than 1.

[0032] 具体分配方法实现步骤如下: [0032] In particular allocation method steps are as follows:

[0033] 1.由基站将小区分为内环和外环(在外环采用D2D模式能获得更好性能); [0033] 1. The base station cell into inner and outer rings (outer ring using the D2D mode can obtain better performance);

[0034] 2.将外环分为偶数个相等的区域,正对圆心的两个区域确定为匹配的一组区域, 如图2 ; [0034] 2. The outer ring is divided into an even number of equal areas, two regions facing the center is determined as a matching set of regions, as shown in FIG 2;

[0035] 3.基站在匹配的两个区域内分别随机找一对D2D对作为匹配的一组D2D对; [0035] A base station to find a pair were randomly D2D in two regions matched pair as a matched set of D2D pair;

[0036] 4.基站根据当前时刻蜂窝用户对D2D对用户的干扰信道增益、路径衰落和D2D用户间的信道增益计算D2D用户间的等效信道增益A=p \,其中Hd表示D2D用户间的1I,OD nCiD 等效信道增益,hd表示D2D用户间的实际信道增益,Ptail表示蜂窝用户对D2D用户的干扰功率,hc;iD表不蜂窝用户与D2D用户间的干扰信道增益; [0036] 4. The base station gain A = p According to the present time the cellular user computing the equivalent channel between the D2D user D2D interference channel gain of users, channel gain between the fading and the D2D user \, where Hd represents between D2D user 1I, OD nCiD equivalent channel gain, hd represents the actual channel gain between user D2D, Ptail represents interference power cellular user D2D user, hc; iD table does not interfere with the cellular channel gain between user and user D2D;

[0037] 5.初始化N和V,分别用来表示每组D2D对分配的子载波数量和等效信道增益,其初始值设为〇; [0037] 5. Initialize N and V, are used to represent each of the D2D and the number of subcarriers equivalent channel gain distribution, the initial value is set to square;

[0038] 6.对于所有可分配的子载波基站依次为其选择在该子载波上平均等效信道增益最大的一组匹配的D2D对,将该子载波分配给这组匹配的D2D对,并将N所对应的项加1直到其满足所要求的子载波数,则不再为其分配子载波,并用V记录分配到的等效信道增益; [0038] 6. For all subcarriers allocated for the base station sequentially select the average maximum equivalent channel gain of a set of matching D2D pair on the subcarriers, the subcarrier allocation to the set of matched D2D, and the equivalent channel gain corresponding to the number of subcarriers N plus 1 entry until it meets the requirements, is no longer assigned subcarriers, and partitioned by recording to V;

[0039] 7.重复步骤6直到将所有子载波分配完毕; [0039] 7. Repeat step 6 until all sub-carriers have been allocated;

[0040] 最后根据信道容量公式计算D2D系统的平均容量。 [0040] Finally calculate the average D2D system capacity based on the channel capacity formula. 该发明相对于传统分配方法能极大地提高D2D用户容量。 The invention, with respect to the conventional allocation method can greatly improve the D2D user capacity.

[0041] 总之本方法是一种全新高效的D2D资源分配方法,其目的是提高D2D系统容量和频谱利用率,减少蜂窝用户对D2D用户的干扰,从而满足D2D用户高数据速率业务的要求。 [0041] In summary the present method is a new and efficient D2D resource allocation method, which aims to improve system capacity and spectrum efficiency D2D, reducing interference to cellular users D2D user, D2D user to meet the high data rate services.

Claims (1)

  1. 1.蜂窝通信系统终端直通自适应资源分配方法,其特征在于该资源分配的方法为: 1) 、根据距离将小区分为内环和外环,在外环采用D2D模式能获得更好性能; 2) 、将外环分为偶数个相等的区域,正对圆心的两个区域确定为匹配的一组区域; 3) 、在匹配的两个区域内分别随机找一对D2D对作为匹配的一组D2D对; 4) 、基站根据当前时刻蜂窝用户对D2D对用户的干扰信道增益、路径衰落和D2D用户间的信道增益计算D2D用户间的等效信道增益 1. The cellular communication system terminal through adaptive resource allocation method, characterized in that the resource allocation method is: 1), according to the distance to the cell into inner and outer rings using D2D mode can obtain better performance in the outer ring; 2), the outer region is divided into an even number of equal, two regions facing the center is determined as a matched set of regions; 3), are random to find a matching pair of D2D as a pair in the two regions match group D2D pair; 4), the base station according to the equivalent channel gain between the current time is calculated on the cellular user channel gain between D2D interference channel gain of users, fading, and user D2D user D2D
    Figure CN102970758BC00021
    ,其中Hd为D2D用户间的等效信道增益,hd为D2D用户间的实际信道增益,Ptail为蜂窝用户对D2D用户的干扰功率,h aD 为蜂窝用户与D2D用户间的干扰信道增益; 5) 、令N,V用来表示每组D2D对分配的子载波数量和等效信道增益,其初始值设为O ; 6) 、对于所有可分配的子载波依次为其选择在该子载波上平均等效信道增益最大的一组匹配的D2D对,将该子载波分配给这组匹配的D2D对,并将N所对应的项加1直到其满足所要求的子载波数,则不再为其分配子载波,并用V记录分配到的等效信道增益; 7) 、重复步骤6)直到将所有子载波分配完毕。 , Where Hd is the equivalent channel gain between D2D user, hd is the actual channel gain between D2D user, PTAIL for the cellular user interference power D2D user, h aD interference channel gain between cellular users and D2D user; 5) , so N, V ​​represents for each group and the number of subcarriers D2D equivalent channel gain distribution, the initial value is set to O; 6), for all subcarriers allocated for sequentially selecting the sub-carriers on average the maximum equivalent channel gain of a set of matching D2D pair, the subcarrier allocation to the set of matched D2D pair, plus a number of subcarriers item until it meets the requirements and the corresponding N, the longer its allocating subcarriers, and assigned to the record with the equivalent channel gain V; 7) repeat step 6) until all sub-carriers allocated.
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