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Private Uplink Communication in C-RAN with Untrusted Radios
IEEE Transactions on Vehicular Technology ( IF 6.8 ) Pub Date : 2020-07-01 , DOI: 10.1109/tvt.2020.2995603
Omid Taghizadeh , Tianyu Yang , Rudolf Mathar

In this work, we study the uplink (UL) of a cloud radio access network (C-RAN), where the central processing unit (CU) utilizes remote radio units (RU)s belonging to the same operator, i.e., the trusted RUs, as well as the RUs belonging to other operators or private owners, i.e., the untrusted RUs. In order to preserve information privacy against the untrusted RUs, the trusted RUs are enabled with full-duplex (FD) capability and transmit a jamming signal towards the exotic RUs, while receiving and forwarding UL signal to the CU. Note that the transmitted jamming signal degrades the decoding capability at the untrusted RUs, however, it can be later subtracted from the UL communication as it is apriori known by the CU. An optimization problem is then formulated to maximize the sum uplink private information rate by jointly designing the fronthaul compression, as well as the information and jamming transmission strategies. Due to the intractability of the resulting mathematical problem, an iterative solution is proposed with convergence to a point satisfying the Karush-Kuhn-Tucker (KKT) optimality conditions. Numerical simulations illustrate a notable gain obtained via the proposed sharing mechanism under the consideration of information privacy.

中文翻译:

C-RAN 中的私有上行链路通信与不受信任的无线电

在这项工作中,我们研究了云无线电接入网络 (C-RAN) 的上行链路 (UL),其中中央处理单元 (CU) 利用属于同一运营商的远程无线电单元 (RU),即受信任的 RU ,以及属于其他运营商或私人所有者的 RU,即不受信任的 RU。为了针对不受信任的 RU 保护信息隐私,受信任的 RU 启用全双工 (FD) 能力并向外来 RU 发送干扰信号,同时接收和转发 UL 信号到 CU。请注意,传输的干扰信号会降低不可信 RU 处的解码能力,但是,由于 CU 先验已知,因此可以稍后从 UL 通信中减去它。然后通过联合设计前传压缩以及信息和干扰传输策略来制定优化问题以最大化总上行链路私有信息速率。由于由此产生的数学问题的复杂性,提出了一个迭代解决方案,收敛到满足 Karush-Kuhn-Tucker (KKT) 最优条件的点。数值模拟表明,在考虑信息隐私的情况下,通过所提出的共享机制获得了显着的收益。
更新日期:2020-07-01
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