Dear Colleagues, WINSYS 2021 is welcoming abstract submissions and also contributions to the Wireless Networks and Mobile Systems 2021 Doctoral Consortium, until the 12th of May. ABSTRACT TRACK: In order to ensure a proper and fair review of the abstracts, we encourage authors to submit abstracts with clear insights and background of the work, and to include complementing material that can help the panel understand its contribution and relevance to the conference. Complementing material could include, for example, previously published papers or videos related to the abstract, to enrich the abstract submission. Abstracts that bring an appropriate complementing material are eligible for oral or poster presentation; otherwise, they are eligible for poster presentation only. Oral presentations are given a 20' minutes time slot. Abstracts will be advertised in the conference program and in the conference book of abstracts (in the printed and digital version), but not published. DOCTORAL CONSORTIUM: The Wireless Networks and Mobile Systems 2021 Doctoral Consortium aims to improve the research of PhD students and broaden their perspectives by giving them the opportunity to share and develop their research ideas in a supportive environment, get feedback from senior members, improve their communication skills, exchange ideas, and build relationships with other PhD students. Accepted contributions will be presented in a dedicated conference session where participants will discuss their research ideas and results, and receive constructive feedback from an audience consisting of their peers as well as more senior experts in the field. In addition to that, students will be invited to participate at poster sessions so that they also receive comments of other participants in the conference. IMPORTANT DATES: Submission deadline: May 12, 2021 Notification of acceptance: May 25, 2021 Camera Ready and Registration: June 3, 2021 For more information, you may send an email to: winsys.secretariat@insticc.org or visit the conference website: http://www.winsys.org