Seminar on Integrated Sensing and Communication (ISAC) Towards 6G

Topic I: Ubiquitous Sensing in 6G Cellular Networks

Recently, the International Telecommunication Union (ITU) has identified integrated sensing and communication (ISAC) as a primary usage scenario for the sixth-generation (6G) cellular networks in IMT-2030 Framework. As a result, future cellular networks will provide not only communication services, but also sensing services such as localization and tracking. However, how to exploit the existing communication infrastructure to effectively achieve sensing functions remains an open problem for 6G. In this talk, we will introduce the methodologies to leverage various types of communication nodes in cellular networks as anchors, including base stations, user equipments, and reconfigurable intelligent surfaces, to perform ubiquitous sensing. Specifically, the advantages and disadvantages of each type of anchors will be listed, and the efficient solutions to overcome these disadvantages will be outlined. Apart from theoretical works, this talk will also present our latest achievements in building a 6G ISAC platform that operates at the millimeter-wave band. We will conclude this talk by discussing some promising future directions that will be beneficial to the transformation of the world’s largest communication network into the world’s largest sensing <a href="http://network.

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Topic II: ISAC Exploiting Prior Distribution Information: Optimized Beamforming and How Many Sensing Beams are Needed?

In wireless sensing or integrated sensing and communication (ISAC) systems, the exact values of the parameters to be sensed are generally unknown before sensing is performed. This leads to unknown channels associated with the sensing targets, which pose new challenges for the beamforming design. On the other hand, the distribution of the parameters to be sensed can be practically acquired a priori based on target properties or statistical analysis. This talk will present a new beamforming optimization framework for wireless sensing or ISAC systems based only on the prior distribution information about the parameters to be sensed. Specifically, we are going to discuss a series of interesting questions as follows. Firstly, for a sensing-only system, with various possible values for each parameter to be sensed, each with a potentially different probability, how to design transmit beamforming and how many sensing beams are needed? We will unveil a novel “probability-dependent power focusing” effect in the optimized beamforming design. Secondly, for an ISAC system with dual-functional beams for sensing and communication, how many dual-functional beams are needed for achieving an optimal trade-off between sensing and communication? Thirdly, for an ISAC system with potentially dedicated sensing beams, when are sensing beams needed and how many sensing beams are needed? Finally, we will reveal the role of such prior distribution information in various other practical problems such as the placement design of sensing anchors as well as the beamforming designs in systems with limited radio frequency (RF) chains, reconfigurable surface, physical-layer security consideration, or networked <a href="http://sensing.

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Speaker(s): Dr. Liang LIU, Dr. Shuowen ZHANG

Room: ACEB 1415, Bldg: Amit Chakma Engineering Building, Western University, London, Ontario, Canada