Non-cooperative resource competition game by virtual referee in multi-cell OFDMA networks
Non-cooperative resource competition game by virtual referee in multi-cell OFDMA networks
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DOI：
10.1109/jsac.2007.070803
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发表时间：
2007-08-01
影响因子：
16.4
通讯作者：
Liu, K. J. Ray
中科院分区：
文献类型：
--
作者：
Han, Zhu;Ji, Zhu;Liu, K. J. Ray
提出了一种分布式非合作对策，用于多小区多用户正交频分复用接入（OFDMA）网络的子信道分配、自适应调制和功率控制。每个用户的目标是在达到理想速率和发射功率有界的约束下，以分布式的方式使自己的发射功率最小。纯非合作博弈可能导致不收敛或出现一些不理想的纳什均衡，系统和个体的绩效都很低。为了提高网络的性能，在网络中引入了一个虚拟裁判，它负责监测和改善分布式用户之间非合作竞争资源的结果。如果游戏结果不理想，要么降低所需的传输速率，要么阻止某些用户使用某些无线电资源，如子信道，以便其他用户更有效地共享有限的资源。此外，可以证明虚拟裁判的引入不会增加网络的复杂性。从双单元情况下的仿真结果来看，与文献中的固定信道分配算法和迭代充水算法相比，所提方案的传输功率分别降低了80%和25%。可实现率可提高10%。在多小区情况下，当同信道干扰严重时，与迭代充水算法相比，该方案可降低高达40%的功耗。
In this paper, a distributive non-cooperative game is proposed to perform sub-channel assignment, adaptive modulation, and power control for multi-cell multi-user Orthogonal Frequency Division Multiplexing Access (OFDMA) networks. Each individual user's goal is to minimize his/her own transmitted power in a distributed manner under the constraints that the desirable rate is achieved and the transmitted power is bounded. The pure non-cooperative game may result in non-convergence or some undesirable Nash Equilibriums with low system and individual performances. To enhance the performances, a virtual referee is introduced to the networks and is in charge of monitoring and improving the outcome of non-cooperative competition for resources among the distributed users. If the game outcome is not desirable, either the required transmission rates should be reduced or some users should be prevented from using some radio resources such as sub-channels, so that the rest of users can share the limited resources more efficiently. Moreover, it can be shown that the introduction of the virtual referee does not increase the complexity of the networks. From the simulation results in a two-cell case, the proposed scheme reduces the transmitted power by 80% and 25% compared with the fixed channel assignment algorithm and the iterative water-filling algorithm in the literature, respectively. The achievable rate can be improved by 10%. In a multi-cell case, the proposed scheme can have up to 40% power reduction compared with the iterative water-filling algorithm when the co-channel interferences are severe.