Encyclopedia of Wireless Networks

Living Edition
| Editors: Xuemin (Sherman) Shen, Xiaodong Lin, Kuan Zhang

Sidelink Transmissions and Proximity Services in LTE-A and Beyond

  • Shao-Yu Lien
  • Der-Jiunn DengEmail author
Living reference work entry
DOI: https://doi.org/10.1007/978-3-319-32903-1_118-1



Sidelink in LTE-A denotes a transmission direction from a user equipment (UE) to another UE(s), in contrast to downlink from an eNB to a UE and uplink from a UE to an eNB. In sidelink transmissions, if a UE has data to be transmitted to another UE(s), a UE can directly transmit data to the destination UE without signal relay via an eNB. Consequently, sidelink transmissions can only take place among two or more UEs within the signal coverage of each other, and such a framework is also known as proximity services (ProSe) or direct transmissions.

Historical Background

Since 2012, the First Responder Network Authority (FirstNet) of the United States (US) Department of Commerce (DoC) is tasked with creating a nationwide network to provide wireless services for public safety agencies across the United States. However, as the costs to develop and to maintain a mobile network particularly for public safety are...

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.National Chung Cheng UniversityChia-YiTaiwan
  2. 2.Department of Computer Science and Information EngineeringNational Changhua University of EducationChanghua CityTaiwan

Section editors and affiliations

  • Hsiao-hwa Chen

There are no affiliations available