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Federated Reinforcement Learning with Adaptive Training Times for Edge Caching

China Communications 2022年第8期19卷 57-72页

作者： Shaoshuai Fan Liyun Hu Hui Tian State Key Laboratory of Networking and Switching Technology Beijing University of Posts and TelecommunicationsBeijing 100876China

To relieve the backhaul link stress and reduce the content acquisition delay,mobile edge caching has become one of the promising *** this paper,a novel federated reinforcement learning(FRL)method with adaptive training times is proposed for edge *** a new federated learning process with the asynchronous model training process and synchronous global aggregation process,the proposed FRL-based edge caching algorithm mitigates the performance degradation brought by the non-identically and independently distributed(noni.i.d.)characteristics of content popularity among edge *** theoretical bound of the loss function difference is analyzed in the paper,based on which the training times adaption mechanism is proposed to deal with the tradeoff between local training and global aggregation for each edge node in the *** simulations have verified that the proposed FRL-based edge caching method outperforms other baseline methods in terms of the caching benefit,the cache hit ratio and the convergence speed.

关键词： edge caching federated reinforcement learning(FRL) non-identically and independently distributed(non-i.i.d.)

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Single-shot Carrier Phase Positioning Method with Wrapping Effect Solution in 5G New Radio Cellular Networks

Single-shot Carrier Phase Positioning Method with Wrapping E...

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2024 IEEE Global Communications Conference, GLOBECOM 2024

作者： Ou, Jinghang Fan, Shaoshuai Tian, Hui Beijing University of Posts and Telecommunications State Key Laboratory of Networking and Switching Technology Beijing100876 China

ISBN: (纸本)9798350351255

As the demand for positioning accuracy reaches the centimeter level, Carrier Phase Positioning (CPP) technology has received widespread attention in 5G New Radio (NR) positioning scenarios due to its high ranging accuracy. In this paper, we presents a new single-shot CPP method suitable for 5G NR cellular networks. By performing a search in the coordinate neighborhood space of the Time Difference of Arrival (TDOA) positioning results, the proposed method bypasses the need for resolving the integer ambiguity required for CPP. It also includes a wrapping effect detection and elimination for the carrier phase measurements. The proposed method finally get the positioning result by calculating cost function which considers both TDOA and CPP results. Numerical simulations demonstrate superior performance compared to other positioning solutions. © 2024 IEEE.

关键词： 5G mobile communication systems

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Hybrid CRB Analysis for Location Sensing in UAV mmWave Systems Under Jittering Effects 16

Hybrid CRB Analysis for Location Sensing in UAV mmWave Syste...

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16th International Conference on Wireless Communications and Signal Processing, WCSP 2024

作者： Chen, Wenyun Liu, Chenxi Peng, Mugen Beijing University of Posts and Telecommunications State Key Laboratory of Networking and Switching Technology Beijing100876 China

ISBN: (纸本)9798350390643

Unmanned aerial vehicle (UAV) systems are vulnerable to the inevitable UAV jitter, the impacts of which on both communications and sensing become more detrimental in the high frequency millimeter wave (mmWave) band. While the UAV jittering effects on communications have been intensively investigated, those on sensing have so far drawn little attention. In this paper, we investigate the location sensing performance of the UAV mmWave system in the presence of jitter. To this end, we identify that the location sensing performance under jittering effects is determined not only the deterministic target's location, but also random instantaneous attitude angles of the UAV. Based on this identification, we derive the closed-form expression of the hybrid Cramer-Rao bound (HCRB) and its approximation to characterize the location sensing performance of our considered system, revealing how the UAV jitter introduces extra location sensing error. Through numerical results, we validate our HCRB analysis. Moreover, we show that the detrimental effects of UAV jitter can be well alleviated by increasing the number of measurements. © 2024 IEEE.

关键词： Cramer-Rao bounds

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Gaussian Decoupling Based Stochastic Resonance for Weak Optical Signal Detection 24

Gaussian Decoupling Based Stochastic Resonance for Weak Opti...

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24th IEEE International Conference on Communication technology, ICCT 2024

作者： Chen, Zhibei Yuan, Renzhi Wang, Siming Chu, Xinyi Di, Shijie Li, Junwei Li, Yuchai Sun, Kailin Guo, Jia Beijing University of Posts and Telecommunications State Key Laboratory of Networking and Switching Technology Beijing100876 China

ISBN: (纸本)9798350363760

Weak signal detection methods can improve the SNR by recognizing the effective signals submerged in background noise. However, the existing stochastic resonance (SR) method is confined exclusively to the optimization of potential function parameters. Actually, the bit-error rate (BER) can be optimized by eliminating the correlation among SR output points. In this work, we propose a Gaussian decoupling based SR method to improve the detection performance of weak optical signals. We first perform the SR method on the received weak optical signal and approximate the probability distribution of the SR output points as a multi-dimensional Gaussian distribution. Then we apply a linear transformation based on eigenvalue decomposition of the Gaussian covariance matrix to decouple the correlation among SR output points. Numerical results show that the BER of Gaussian decoupling based SR method can be one order of magnitude lower than that of the ordinary SR method even when the SNR of input signal is -8 dB. © 2024 IEEE.

关键词： Eigenvalues and eigenfunctions

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NOMA-Based Collaborative Beam Hopping Frequency Allocation Mechanism for Future LEO Satellite Systems

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China Communications 2023年第6期20卷 321-338页

作者： Fei Zheng Zhao Pi Zou Zhou Miao Ye Hongbing Qiu Ministry of Education Key Laboratory of Cognitive Radio and Information Processing Guilin University of Electronic TechnologyGuilin 541004China State key Laboratory of Networking and Switching Technology Beijing University of Posts and TelecommunicationsBeijing 100876China

Low Earth orbit(LEO) satellite systems provide terrestrial users with services that are not limited by geographical location. However, the conflict between existing allocation schemes and the business variability between beams is becoming increasingly prominent. Beam hopping technology allows for a more flexible and versatile approach to satellite resource allocation. This paper proposes a beam hopping pattern optimization scheme that jointly considers the interference threshold distance and beam service priority, reducing the inter-beam co-channel interference(CCI). In the cluster area, a non-orthogonal multiple access(NOMA)-based collaborative beam hopping(NCBH) scheme is proposed to minimize the cell-edge user(CEU) interference. Since there is a difference in channel gain between the CEU and cellcenter user(CCU), this scheme forms a NOMA cluster to perform power domain multiplexing and formulates a NOMA cluster pairing strategy according to the user location to reduce the CCI of the CEU. After NOMA cluster pairing, the optimal carrier frequency of the NOMA cluster is selected by a reinforcement learning algorithm. The simulation results verify the excellent performance of the proposed NCBH scheme regarding the user’s received power, transmission rate, and outage probability.

关键词： LEO satellite beam hopping NOMA resource allocation

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Impacts of Blockages on UAV-Enabled Integrated Sensing and Communications 16

Impacts of Blockages on UAV-Enabled Integrated Sensing and C...

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16th International Conference on Wireless Communications and Signal Processing, WCSP 2024

作者： Liu, Chengguang Liu, Chenxi Chen, Wenyun Peng, Mugen Beijing University of Posts and Telecommunications State Key Laboratory of Networking and Switching Technology Beijing100876 China

ISBN: (纸本)9798350390643

In this paper, we investigate the impacts of block-ages on the performances of the unmanned aerial vehicle (UAV)-enabled integrated sensing and communication (ISAC) systems. Specifically, we first derive the distance distribution between UAV and a typical target in both communication and sensing scenarios, in the presence of three-dimensional blockages. Compared to previous models that either ignored blockage effects or considered only in two-dimensional plane, our model provides a more realistic characterization of random blockages in UAV-enabled ISAC systems. Then, we leverage the tools from stochastic geometry to derive the analytical expressions of the communication coverage probability and successful detection probability in our considered system. Finally, we validate our analysis through numerical results and reveal the interactions between communication and sensing performances, under the impacts of blockages. © 2024 IEEE.

关键词： Stochastic systems

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BGP prefix hijack detection algorithm based on MOAS event feature

BGP prefix hijack detection algorithm based on MOAS event fe...

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2024 International Conference on Computer Network Security and Software Engineering, CNSSE 2024

作者： Chen, Kaiyu State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing100876 China

ISBN: (纸本)9781510680234

Border Gateway Protocol (BGP) is the Internet standard inter-domain routing protocol, has become an important infrastructure of the Internet. Due to the limitation of the initial design, BGP prefix hijacking is a kind of BGP security problem that needs to be solved urgently. This paper proposes a BGP prefix hijack detection algorithm based on Multiple Origin AS (MOAS) event feature, discovering and restoring MOAS events from BGP packets, and creating an event matrix for MOAS events based on the changes of source AS observed from different observation points over time. According to the MOAS event matrix, the eigenvalue of the event is calculated from the perspective of the overall probability of the event and the local visibility of the observation point. Finally, the characteristic value of the MOAS event is compared with the exception event threshold to determine whether the event is an exception event, and then the BGP prefix hijacking is found. Compared with the prefix hijacking detection algorithm based on source AS validity, the detection results of this algorithm have higher accuracy. This method is more practical in detecting prefix hijacking according to the characteristics of the event itself. © 2024 SPIE.

关键词： Anomaly detection

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Device-Cloud Collaborative DDoS Resistance for QoS-Sensitive Mobile Applications: A Seamlessly Shuffle-based Moving Target Defense Approach

Device-Cloud Collaborative DDoS Resistance for QoS-Sensitive...

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2024 IEEE Global Communications Conference, GLOBECOM 2024

作者： Yan, Lin Zhou, Zan Yang, Shujie Xu, Changqiao Beijing University of Posts and Telecommunications State Key Laboratory of Networking and Switching Technology Beijing100876 China

ISBN: (纸本)9798350351255

DDoS attacks pose a fundamental security consideration for any application. With the rapid development of technology, highly QoS-sensitive and rich interaction mobile applications have occupied a great portion of current network traffic. However, owing to their inherent compatibility defects, current shuffle-based solutions fail to accommodate the urgent needs of QoS-sensitive applications, as the defenders require either nonnegligible service interruption or obligatory system modification. Therefore, we propose a feasible DDoS defense solution called RINP, which can be seamlessly integrated with existing applications through its innovative overlay-based wrap mechanism and isolated sidecar implementation. What's more, we mathematically analyse the communication efficiency and false positive rate of RINP, which provides theoretical foundation for further adaptive defense strategy generation. Last but not least, to demonstrate the superiority of the RINP demo, we conduct a series of experiments in real-world WAN scenarios. The experimental results with Iperf3 (both TCP/UDP modes) show that our compatible defense solution can jointly provide great service continuity and maintain high-quality QoS. To the best of our knowledge, this is the first user-imperceptible and nonintrusive device-cloud collaborative defense solution for QoS-sensitive mobile applications. The source code can be found at https://***/bupt-narc/rinp. © 2024 IEEE.

关键词： HTTP

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Intellicise communication system: model-driven semantic communications

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The Journal of China Universities of Posts and Telecommunications 2022年第1期29卷 2-12页

作者： Zhang Ping Xu Xiaodong Dong Chen Han Shujun Wang Bizhu State Key Laboratory of Networking and Switching Technology Beijing University of Posts and TelecommunicationsBeijing 100876China

As one of the critical technologies for the 6 th generation mobile communication system(6 G) mobile communication systems, artificial intelligence(AI) technology will provide complete automation for connecting the virtual and physical worlds. In order to construct the future ubiquitous intelligent network, people are beginning to rethink how mobile communication systems transmit and exploit intelligent information. This paper proposes a new communication paradigm, called the Intellicise communication system: model-driven semantic communication. Intellicise communication system is built on top of the traditional communication system and innovatively adds a new feature dimension on top of the traditional source coding, which enables the communication system to evolve from the traditional transmission of bit to the transmission of "model". Like the semantic base(Seb) for semantic communication, the model is considered as the new feature obtained from the joint source-channel coding. The sink node can re-construct the original signal based on the received model and the encoded sequence. In addition, the performance evaluation metrics and the implementation details of the Intellicise communication system are discussed in this paper. Finally, preliminary results of model-driven image transmission in the Intellicise communication system are presented.

关键词： Intellicise communication system semantic communications model driven the 6th generation mobile communication system artificial intelligence

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Carrier Phase-Based Localization Method for TDD Systems via Extended Kalman Filter 25

Carrier Phase-Based Localization Method for TDD Systems via ...

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25th IEEE Wireless Communications and networking Conference, WCNC 2024

作者： Peng, Zixiang Fan, Shaoshuai Tian, Hui Beijing University Of Posts And Telecommunications State Key Laboratory Of Networking And Switching Technology Beijing100876 China

ISBN: (纸本)9798350303582

In time-division duplex (TDD) systems, where uplink and downlink channels alternate during transmission process, the continuity of carrier phase measurements becomes challenging to maintain. This leads to periodic lock-loss in the phase-locked loop (PLL), rendering the integer ambiguity non-constant. To address this issue, a carrier phase-based localization method for TDD systems via extended Kalman filtering is proposed in this study. The proposed method modifies the one-step predicted state within each TDD cycle based on extended Kalman filtering (EKF) to overcome the effects of PLL lock-loss in TDD. Simulation results verificate that the proposed method can overcome the problem of discontinuous measurement in TDD system, accurately solve integer ambiguities and achieve high-precision positioning. © 2024 IEEE.

关键词： Phase locked loops

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