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A hierarchical gamebased power allocation algorithm in 5G heterogeneous integrated networks
EURASIP Journal on Wireless Communications and Networking volumeÂ 2020, ArticleÂ number:Â 245 (2020)
Abstract
In this paper, we proposed a novel power allocation algorithm based on hierarchical game in 5G heterogeneous integrated networks. The radio network controller is the first layer, the base stations are the second layer, and the base station users are the third layer. The stackelberg game model is used between the first and second layers, in which the radio network controller is the leader and the base stations are the followers. The radio network controller sets the interference prices for the base stations and the users in the third layer can update their transmission power by noncooperative game based on the setting interference price. According to the proposed scheme, the users power allocation can reach the Nash equilibrium through by noncooperative game and obtain the optimal transmission power. Moreover, it is proved that the equilibrium solution is composed of the optimal price and the optimal transmission power, and the convergence of this algorithm is also verified. The simulation results show that the proposed algorithm can decrease the interference and improve the system capacity.
1 Methods/experimental
In this paper, the RNC is considered in the 5G heterogeneous integrated network system. As a part of the access network, RNC has the function of wireless resource management and control. We establish a threelayer network structure composed of RNC, base stations and users in this paper. Firstly, the stackelberg game is formulated between the first and second layers, in which the radio network controller sets the interference prices for the base stations. Then, the users in the third layer can update their transmission power by noncooperative game based on the setting interference price. Finally, the RNC can update the price according to the obtained power and calculate the optimal price for base station, and the users power allocation can reach the Nash equilibrium based on noncooperative game and obtain the optimal transmission power. Moreover, it is proved that the equilibrium solution is composed of the optimal price and the optimal transmission power, and the convergence of this algorithm is also verified. The simulation results show that the proposed algorithm can decrease the interference and improve the system capacity, respectively.
2 Introduction
With the development of modern communication technology, 5G will become a new generation of mobile communication system. 5G networks can overcome the shortcomings of 4G in terms of network quality, delay, throughput and energy consumption. 5G contains many key technologies: massive MIMO, device terminal direct communication, ultradense network, etc. [1]. Massive MIMO can reduce interference and increase spectrum efficiency through multiantenna input and output. Direct communication among different terminals can expand communication applications. Ultradense network can expand coverage area and increase system capacity. At the same time, 5G has more extensive and flexible application scenarios. It can meet the different needs of users for communication quality and transmission rate.
Most of the 5G network construction is the integration of heterogeneous networks. A heterogeneous fusion network is composed of different access modes and terminal devices. Many wireless access technologies coexist in 5G heterogeneous networks, including 4G, LTE and so on. Compared with the traditional network structure with simple macrobase station, its main advantages include increasing network coverage area and system capacity. Increasing the deployment range of small base stations can increase signal coverage area, being a supplement to those areas not covered, reducing the blind area of signal. The overall capacity of the system will be improved by coordinating the spectrum allocation among the macrobase station and other base stations. But there are also some problems to be solved, such as interference, resource allocation and so on. In [2, 3], there exists the interference among data flows in the same channel or among different communication nodes.
There are three types of power allocation technologies in 5G heterogeneous fusion network. Centralized power allocation can use a centralized control center to search and store information related to channel, power, signaltonoise ratio, etc., and allocate communication resources. Reasonably analyzing related data and allocating system resources is needed. Centralized power allocation acquires a certain number of basic equipments to realize the function of the centralized control center and the working process of centralized control center is very complex, which is quite difficult to apply. Distributed power allocation has no centralized control center. Terminals in the network do not need to interact information with other users, and they only need to consider their own transmission rate. The combination of centralized power allocation and distributed power allocation is semidistributed power allocation. Centralized distribution processing is carried out between the central control center and the base stations, and then the base station realizes further power allocation for their respective management areas.
In order to improve the system capacity and reduce interference, this paper established a threelayer network structure model, and adopt the semidistributed power allocation based on game theory. The threelayer model is composed of RNC, base stations and users, which requires RNC to allocate spectrum resources and channel resources. Stackelberg game is used between RNC and base stations. RNC is the leader and the base stations are the followers. RNC analyzes the network situation and is responsible for the resource utilization and allocation of the whole network. RNC will allocate wireless network resources to each base station. Users only need to consider their own transmission rate. In order to improve the transmission rate, they need to improve their own transmission power. A noncooperative game model among users is constructed to maximize the transmission rate. Then, the users can achieve the optimal performance and the whole system will achieve the stable state. Base stations need to have information interaction with RNC, while users do not need to interact with other users. Therefore, we adopt the semidistributed power allocation which combines centralized and distributed power allocation.
The remainder of this paper is organized as follows. SectionÂ 3 outlines some related work. The system model is established in Sect.Â 4. SectionÂ 5 introduces the power allocation algorithm based on hierarchical game. Simulation results are presented in Sect.Â 6. At last, Sect.Â 7 concludes this paper.
3 Related work
With the continuous development of communication technology, the number of mobile users and the growth of data traffic, more new theories and methods are needed to solve various problems in the communication process. The idea of game theory has been widely used in wireless communication, such as spectrum allocation, resource allocation, routing design and other issues; these can be studied by using the relevant theoretical knowledge of game theory. There are many game theory models for the power allocation such as coalitional game, noncooperative game, and stackelberg game, etc.
Sun et al. [4] use coalition formation game to allocate joint resource in devicetodevice uplink underlaying cellular networks. In the twotier cognitive femtocell network, LeAnh et al. [5] treat the subchannel and power allocation optimization problem as NPhard and propose an autonomous framework. Then, they formulate the optimization problem as a coalitional game in partition form. Wang et al. [6] cluster users by coalition game, and then the power allocation among users in the cluster is based on Stackelberg game. Zhang et al. [7] use the cooperative Nash bargaining game theory to solve the joint uplink subchannel and power allocation problem. To decrease the computation complexity, Liu et al. [8] use supermodular game for subchannel matching and power allocation problems. In twotier femtocell networks, Tsiropoulou et al. [9] treat the joint resource allocation problem as a twovariable optimization problem and utilize supermodular game to solve the above problem. Zhong et al. [10] consider combining power control and resource allocation. They propose a pricingbased game scheme and a link scheduling scheme to guarantee the qualityofservice and achieve the lowlatency requirement. Zhang et al. [11] consider the delay constraints to guarantee the qualityofservice and bring in the concept of effective capacity and use supermodel game to solve the power allocation problem.
In the process of noncooperative game, there is no consensus among the players. The players take their own interests as the starting point to take the corresponding strategic plan; the focus is to pursue the maximization of personal interests. Gonzalo et al. [12] use noncooperative game to optimize downlink performance and solve the load problem. Leshem and Zehavi [13] use noncooperative game to allocate channel resources, and finally achieve Nash equilibrium. Hamidi et al. [14] propose a distributed power allocation mechanism using a noncooperative game model. Rahman et al. [15] solve the energy optimization by using noncooperative game for an arbitrary Gaussian channel. In [16,17,18,19,20,21,22,23], noncooperative game can effectively allocate system resources in hierarchical networks.
According to the rank order of the game, the players can be divided into leader and follower in stackelberg game. Leaders take action first, and then followers take their actions, which can be regarded as a twolevel game process. The top level of the game means that leaders choose their own strategic behaviors according to the information of the followers. The bottom level of the game means that the followers observe the leadersâ€™ strategies and then choose their own strategies. When the game process reaches to equilibrium state, neither the leader nor the followers can increase the profit by changing their own strategies. Qi et al. [24] propose a twostage pricingbased power allocation scheme based on a stackelberg game model and provide the optimal power allocation strategy. Yuan et al. [25] propose a CSIbased distributed channelpower allocation scheme. They use stackelberg game to solve the power control problem. Li et al. [26] use stackelberg game to allocate the power resource between the base station and multiple users. Su et al. [27] propose a stackelberggame theoretic resource allocation scheme to allocate resource to mobile social users though brokers. Ruby et al. [28] use two separate stackelberg games to solve the power allocation problem and they need a centralized entity to connect these two games. Ahmad et al. [29] use bilevel stackelberg game to study the joint price and power allocation in spectrum sharing macrofemtocell networks. In [30,31,32,33,34,35,36], stackelberg game is widely used to solve the problem about power allocation in different communication environments including devicetodevice communications, multiuser cooperative communication networks, heterogeneous NOMA networks and dynamic spectrum access networks.
In this paper, the game theories including noncooperative game and stackelberg game are used into 5G heterogeneous fusion network to enhance system capacity and reduce interference. Considering the relationship between radio network controller and base stations, a threelayer heterogeneous network structure model composed of radio network controller, base station and users is established. Stackelberg game model is used between the first and second layer, and noncooperative game is used for usersâ€™ power allocation.
4 System model
In this section, a threelayer heterogeneous fusion network model is composed of radio network controller, base stations and base station users, respectively. RNC is the first layer, base stations are the second layer and the users are the third layer.
The system model is as follows in Fig.Â 1.
In the above threelayer network structure model, since each base station of the second layer is controlled and managed by the RNC in the first layer, the stackelberg game model is used between the first layer and the second layer. In the stackelberg game, RNC is the leader and base stations in the second layer play the roles of followers. The strategy behavior of the base station is going to adjust according to the strategy of the RNC. The positions and identities of the players in the game which are the users in the third layer are equal and each of them needs to decide their next strategic behavior according to the behavior of other users. They will use the noncooperative game to acquire their transmission power according to the power allocated by the base stations in the second layer.
Orthogonal frequency division multiplexing access (OFDMA) technology is used in this communication network. Base station users share a common frequency band for data transmission.Â Assuming that the allocation of subchannels has been completed in this system, multiple users belonging to the same base station cannot occupy a channel resource at the same time, so there is only one active user belong to the base station in a specific time slot. In this time slot, this active user transmits data information to its base station.
Base stations will choose their own optimal transmission power according to RNCâ€™s price. Users reach the Nash equilibrium by noncooperative game and obtain the optimal transmission power. Then, the RNC obtains its optimal prices based on the optimal transmission power. At this time, the whole system reaches the stackelberg equilibrium.
The SINR of the user \(i\) is shown in Eq.Â (1).
The total number of base stations is \(N\). \(p{}_{i}\) and \(p{}_{j}\) denotes transmission power of base station \(i\) and \(j\), respectively. \(p{}_{0}\) denotes transmission power of RNC. \(h_{ii}\) denotes the power gain between base station \(i\) and its user, \(h_{i0}\) denotes the interference channel gain between RNC and base station \(i\), and \(h_{ij}\) denotes the interference channel gain between other base stations and base station \(i\)â€™s user. \(n_{0}\) denotes the noise power.
5 Algorithm design
In the above threelayer heterogeneous fusion network model, RNC acts as the game leader, base stations acts as followers in stackelberg game and makes corresponding strategies according to the actions of RNC. Users get their optimal strategies through noncooperative game method, that is, the optimal transmission power.
In order to reduce the interference to users, RNC sets prices for each base station. If the price is too low and base stationâ€™s power is too high, it will cause more interference. For its own utility and benefit, RNC will increase its price. Base stationâ€™s power will be reduced accordingly. RNCâ€™s price and base stationâ€™s power interact with each other, forming a stackelberg game. Base stations will choose their own optimal strategies according to RNCâ€™s price. The Nash equilibrium is achieved by noncooperative game between users, and thus the optimal transmission power is obtained. Then, the RNCâ€™s optimal price is obtained according to the optimal transmission power. At this time, the whole system reaches a stable state. The set of the optimal price and the optimal transmission power is the equilibrium solution of the game.
The utility function of base station \(i\) is shown in Eq.Â (2).
\(w_{i}\) denotes the channel transmission bandwidth. RNCâ€™s price for base station is denoted by \(\lambda_{i}\).
At the same time, RNC should set reasonable price to reduce the interference to users. The utility function of RNC is shown in Eq.Â (3).
In summary, RNCâ€™s optimization problems can be expressed in Eq.Â (4).
\(R_{i}^{L}\) and \(R_{i}^{U}\) are the lower and upper bounds of the link transmission rate, respectively, to ensure the quality of service while the base station \(i\) and its user transmitting data.
Base stationâ€™s optimization problems are expressed in Eq.Â (5).
EquationsÂ (4) and (5) constitute a stackelberg game process. When RNC has mastered the optimal strategy of the base station, it will set reasonable prices to the base stations. The base stations will adjust their own transmission power by observing the strategy of RNC and base stations will take corresponding strategies to adjust their own transmission power to maximize their benefits. Then, for a given price, users reach Nash equilibrium by the noncooperative game and they will get the optimal transmission power. The optimal power can be obtained by iteration and then the prices of base stations set by RNC can be obtained and the whole system reaches Stackelberg equilibrium.
While solving the above optimization problems, the backward method is used to find the equilibrium solution when the usersâ€™ noncooperative game reaches Nash equilibrium, that is, to find the optimal transmission power, and prove the existence and of the equilibrium solution. The next step is to change the optimal transmission power into matrix form and simplify it into the utility function of RNC, and then we can get the optimal price.
According to Eq.Â (2), we can get the optimal transmission power which is shown in Eq.Â (6).
Because the power is greater than zero, the power set is not empty.
The second derivative of Eq.Â (2) is shown in Eq.Â (7).
Each base station in the system will be allocated power, so the \(p\) set is a nonempty set. And the utility function \(U_{i}\) of base station \(i\) is a continuous function of \(p_{i}\) and Eq.Â (7) clarifies that \(U_{i}\) is a convex function. Thus, Eq.Â (2) is a continuous convex function. EquationÂ (2) satisfies the two existence conditions for Nash Equilibrium solutions. EquationÂ (7) is the optimal transmission power. EquationÂ (7) can be expressed in Eq.Â (8). And \(H\) is shown in Eq.Â (9).
By substituting the optimal transmission power obtained into the optimization problem of RNC, \(U_{RNC}\) can be expressed in Eq.Â (10).
Because the base stations are very densely distributed in 5G heterogeneous integrated network, the interference fading from any base station to other base stationâ€™s users is the same. So the interference fading from one base station to its users is much smaller than that from the base station to other users, we can consider \(h_{ij}\) as a constant number. Then, \(H\) can be expressed in Eq.Â (11).
And let \(\alpha_{i} = h/(h_{ii}  h)\). Then, \(H\)â€™s inverse matrix is shown in Eq.Â (12). And \(A\) is shown in Eq.Â (13).
Because of Eq.Â (14), \(A\) is a zero matrix.
EquationÂ (10) can be expressed in Eq.Â (15).
The first derivative of Eq.Â (15) is shown in Eq.Â (16).
EquationÂ (15) is increasing and Eq.Â (4) can be simplified in Eq.Â (17).
Then, we can get the optimal RNCâ€™s price which is shown in Eq.Â (18).
EquationsÂ (6) and (18) are the equilibrium solution of stackelberg game. In order to verify the convergence of the proposed algorithm, we set an iteration function, the power of the iteration function can gradually converge to the equilibrium point, and the system will reach a stable state. The iteration function is shown in Eq.Â (19).
Because the power is greater than zero, Eq.Â (19) satisfies positive definiteness.
The optimal transmission power can be expressed in Eq.Â (20).
EquationÂ (20) is decreasing and Eq.Â (19) satisfies monotonicity.
According to the deformation of Eq.Â (6), we can obtain Eq.Â (21).
For arbitrary \(\beta \ge 1\), there is Eq.Â (22).
We can see that Eq.Â (22) is greater than zero, so Eq.Â (19) satisfies measurability.
EquationÂ (19) satisfies positive definiteness, monotonicity and measurability. It is a standard function and it is convergent. Then, we propose a power allocation algorithm based on the above iteration functions. The pseudocode of the algorithm is given in Algorithm, which can display the proposed power allocation algorithm entirely and accurately.
In this algorithm, RNC is the leader of the game, and base stations are the followers. It is divided into the following steps.

(1)
According to the base stationâ€™s initial transmission power, we can calculate each base stationâ€™s initial price, and then RNC broadcasts the prices to base stations;

(2)
After receiving the price, the base station adjusts its transmitting power according to the iteration formula.

(3)
After the iteration, each base station gets its optimal transmission power and RNC gets the optimal price for each base station.
The base station receives RNCâ€™s price and iterates its power to the optimal transmission power. Then, RNC updates its own price according to the convergent power and gets the optimal price. The equilibrium solution of the game is composed of both the optimal price and the optimal transmission power of base station.
6 Simulation analysis
According to the power allocation algorithm proposed in the previous chapter, 15 base stations are set up. And the link gain is defined as follows.
The transmission loss between RNC and base station is \(K_{i0}\). The transmission loss between base station \(i\) and its user is \(K_{ii}\). The transmission loss between base station \(j\) and base station \(i\)â€™s user is \(K_{ij}\). The distance between RNC and base station is \(d_{i0}\). The distance between base station \(i\) and its user is \(d_{ii}\). The distance between base station \(j\) and base station \(i\)â€™s user is \(d_{ij}\).
In order to verify the performance of this algorithm, the simulation is carried out using MATLAB 2016b. The simulation conditions are shown in Table 1. We set the RNCâ€™s power as 45 dBm and the base stationsâ€™ power as 20 dBm before iteration. The base station position is determined by setting different distances from the RNC and the distance value is set randomly.
FigureÂ 2 shows the change of base station transmission power following the iterations. It shows the transmission power of each base station reaches equilibrium after two iterations, and the iteration gradually converges. In order to maximize the throughput, the base station will continuously improve its own transmission power to achieve the increase in throughput. Since the base station improves the transmission power, it will produce interference. At the same time, due to the interference, the base station will continue to increase the transmission power, which will lead to more interference. After setting the RNC price, the base station not only needs to consider its own throughput, but also needs to consider the cost of interference. It can be seen from Fig.Â 2 that with the increasing of RNC price, the base station will pay more for interference, resulting in the decrease in its utility function, and finally the transmission power of the base station will continue to decrease.
FigureÂ 3 shows RNCâ€™s price for each base station when the iteration reaches a stable state. It shows that with the increasing RNC price, the base station will pay more because of the interference. And it results in the reduction in its utility function, and ultimately the transmission power of the base station will decrease.
In order to validate the effectiveness of the proposed power allocation method, other two power allocation methods are compared as references. One is the method with the fixed price of RNC, and the other is with the unupdated price. The distance between RNC and each base station is set randomly. The 15 base stations are arranged according to the distance between the base station and the RNC from near to the far and the xaxis is labeled 1â€“15 in Figs.Â 4 and 5. RNC sets a unified price for all base stations under the fixedprice and unupdatedprice schemes and this cause some base stationsâ€™ transmitting power with small interference will be greatly reduced. In order to avoid affecting the transmission performance of the whole system, RNC sets different prices for each base stations according to the interference generated by different distances in the pricing update scheme. After receiving RNCâ€™s price, the base station adjusts its own power. RNC updates the prices for different base stations according to the optimal transmission power obtained by the base station adjustment. RNC obtains the optimal price and the optimal transmitting power for each base station through iteration. FigureÂ 4 compares the RNCâ€™s prices of each base station under three different methods. The pricing update method adopted in this paper will set a reasonable price compared with other two methods.
Regardless of the fixed pricing, Fig.Â 4 shows that the interference price is related to the distance between RNC and base stations. When the base station is close to RNC, the interference will be larger, while RNC will set a higher price for the base station. The base station will pay more for adjusting its transmission power. When the base station is far away from RNC, with less interference, RNC will reduce its price.
FigureÂ 5 shows the utility function of base station under three different methods. The pricing update method sets lower prices than the other two methods. Then, the cost for interference is reduced, and the utility function of base station is increased, so the system performance can be improved.
For the purpose of maximizing systemâ€™s throughput, base station will increase its throughput by continuously increasing its transmission power. Then, because the base station increases its transmission power, this will generate more interference. At the same time, due to the existence of interference, the base station will continue to increase its transmission power, which will lead to more interference. After the interference pricing of RNC is introduced, the base station not only needs to consider its throughput, but also the cost of interference needs to be considered. Combined with Figs.Â 4 and 5, base stations with lower price, its cost of the interference is less than others, its utility function is higher and it will obtain more power than other base stations, which is in line with the actual situation.
From the above simulation results, it can be seen that the goal of the game theory is to maximize the utility function, and each user can maximize their own utility function through the increase in transmission power. However, due to the interference caused by the increase in transmission power, the strategy of maximizing the utility function chosen by a single user will have an external effect on other users, which needs to be solved by setting the appropriate prices.
FigureÂ 6 shows that the algorithm has reached a stable state in the second iteration. The comparison of the system capacity in different scenarios is given when the number of base stations N is 5, 15 and 25, respectively. With the increase in the number of base stations, the total capacity of the system based on the above power allocation algorithm will increase. It shows that the system can accommodate as many users as possible with limited resources.
7 Results and discussion
This paper proposed a novel power allocation algorithm based on hierarchical game in 5G heterogeneous integrated networks. A threelayer power game model is proposed among the RNC, base stations and users, and the hierarchical game is used to solve the power allocation problem. Firstly, the stackelberg game is formulated between the first and second layers, in which the radio network controller sets the interference prices for the base stations. Then, the users in the third layer can update their transmission power by noncooperative game based on the setting interference price. Finally, the RNC can update the price according to the obtained power and calculate the optimal price for base station, and the users power allocation can reach the Nash equilibrium based on noncooperative game and obtain the optimal transmission power. The convergence of this algorithm is also analyzed and the simulation results show that the proposed algorithm can decrease the interference and improve the system capacity.
Availability of data and materials
Not applicable.
Abbreviations
 RNC:

Radio network controller
 OFDMA:

Orthogonal frequency division multiplexing access
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Acknowledgements
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Funding
This work was supported by the National Natural Science Foundation of China under Grant Nos. 61701284, 61671144, 31671588 and 61472229, the Innovative Research Foundation of Qingdao under Grant No. 19621cg, the Application Research Project for Postdoctoral Researchers of Qingdao, the Sci. & Tech. Development Fund of Shandong Province of China under Grant No. 2016ZDJS02A11 and ZR2017MF027, the Humanities and Social Science Research Project of the Ministry of Education under Grant No. 18YJAZH017, the Taishan Scholar Climbing Program of Shandong Province under Grant No. ts2090936, SDUST Research Fund under Grant No. 2015TDJH102, and the Science and Technology Support Plan of Youth Innovation Team of Shandong higher School under Grant No. 2019KJN024.
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GC and LYM conceived and designed the experiments. QTZ and LYM performed the experiments. JJZ and LYM analyzed the data. GC, LYM and QTZ wrote the paper. All authors have contributed to this research work and read and approved the final manuscript.
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Chen, G., Ma, L., Zeng, Q. et al. A hierarchical gamebased power allocation algorithm in 5G heterogeneous integrated networks. J Wireless Com Network 2020, 245 (2020). https://doi.org/10.1186/s13638020018663
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DOI: https://doi.org/10.1186/s13638020018663