Muhammad Shahzeb Ali et al., International Journal of Advanced Trends in Computer Science and Engineering, 10(3), May - June 2021, 2569– 2579 2569 ABSTRACT A wireless sensor network is the combination of a hundred devices randomly scattered in the field to sense facts. Sensor devices having the facility of sensing, storing, energy resources, and data broadcasting, but they are not rechargeable or replaceable. The small energy resources of sensors always encourage the development of energy- efficient protocols to make a long lifetime of WSN. It's essential to build routing protocol, which helps us make maximize the network life span through energy efficiency. In this systematic literature review, we have to discuss various researchers' efforts so for concerning the energy efficiency of the Wireless sensor network using the various techniques. Mainly In this systematic literature review we have to discuss about the major issues and their concerned proposed routing protocol reviewed in the literature. This paper also includes the methodology that will descried the method is adopted in this systematic literature review. More over this SLR also described the results in the sense of the digital libraries, major contributions in this literature review, end techniques used in these routing protocols. Key words: Energy efficient routing protocol, WSN, Clustering, cluster head, Routing, Energy Distribution, Lifetime. 1. INTRODUCTION There is an immense growth in the development of WSN appliances due to the new studies. A sensor is a small electromechanical device with limited storage capacity, limiting fixed energy capital with a data broadcasting facility [1]. WSN’s means to support the application used to monitor the environment of agricultural, industrial, medical, military, etc. [2]. As WSN’s have compatibility with various systems, few issues arise for the users of this type of application like design, security, energy efficiency, etc. [3]. This section will present the broad thought of wireless sensor systems, their applications, significant issues, and the development & transmission protocols for WSN’s. A wireless sensor network is an integrated system of small micro-electro-mechanical devices with a base station's central system [1, 54]. Small sensor devices are used in the network to get information from the field at BS. The main focus of WSN is to observe the area. WSN is based on small nodes with the potential of data sensing, communication, and processing of the collected data to generate valuable results. A self- organized system is used to observe the environments for a specific purpose in different areas of life. This system is applied to sense facts from the field by sensor nodes, transmits these facts to the base station via integrated radio transmitters. Such a system can cover up the short precise region but always face limited energy resources for SN’s. The architecture of the wireless sensor network is bellowed. Figure 1: WSN Architecture Energy-Efficient Routing Protocols for WSN: A Systematic Literature Review Muhammad Shahzeb Ali 1 , Dr. Ansar Munir Shah 2 , Mubashir Hussain Malik 3 Ahmed Raza Mohsin 4, Maira Khalid 5 1 Inutitute of Southern Punjab Multan, Pakistan, muhammadshahzebali60@gmail.com 2 Institute of Southern Punjab, Pakistan, Email, amshah@isp.edu.pk 3 Institute of Southern Punjab, Pakistan, mubasher@isp.edu.pk 4 Institute of Southern Punjab, Pakistan, ahmedraza.1st@gmail.com 5 Institute of Southern Punjab, Pakistan, maira.khalid7272@gmail.com ISSN 2278-3091 Volume 10, No.3, May - June 2021 International Journal of Advanced Trends in Computer Science and Engineering Available Online at http://www.warse.org/IJATCSE/static/pdf/file/ijatcse1481032021.pdf https://doi.org/10.30534/ijatcse/2021/1491032021