Abstract

The number of mobile devices and wireless connections is significantly increasing. Among many wireless protocol types, wireless local area networks (WLANs) are expected to support a significant number of devices. Due to this reason, effective and efficient handover (HO) and vertical handover (VHO) support for WLAN mobile devices is important. A significant improvement in quality of service (QoS) can be obtained by reducing the association and disassociation interruption time for user equipment (UE) servicing real-time applications during WLAN HO and VHO operations. Based on this focus, this paper investigates the problem of using only the received signal strength indicator (RSSI) in HO and VHO decisions, which is what the current IEEE 802.11 based WLAN systems use. Experimental results presented in this paper demonstrate that only using the RSSI results in significant interruption time during HO to another WLAN access point (AP) or to a cellular base station during VHO. Therefore, in this paper, an improved association and disassociation scheme that can reduce the data interruption time (DIT) and improve the throughput performance is proposed.

Highlights

  • Wireless local area networks (WLANs) devices use the received signal strength indicator (RSSI) for association and disassociation [1]

  • To avoid these network performance degrading issues, when a user equipment (UE) is in the partial packet success (PPS) region of its access point (AP), the proposed scheme enables the UE to quickly find an alternative AP with satisfying quality to establish a connection through association procedures, while the UE executes disassociation procedures with the former AP that has poor conditions

  • The disassociation procedure is based on the signal to interference and noise ratio (SINR) level of the received packets and the PPS phenomena detection, which depends on the request to send (RTS)/clear to send (CTS) and data packets transfer success/failure conditions

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Summary

Introduction

Wireless local area networks (WLANs) devices use the received signal strength indicator (RSSI) for association and disassociation [1]. Handover (HO) and vertical HO (VHO) based on the RSSI threshold cannot perform properly in places with severe interference. In [2], the HO RSSI threshold is calculated considering the speed and direction of the user equipment (UE). In [3], the session setup as well as the speed and direction of the UE is considered in the calculation of the HO RSSI threshold. These two schemes were designed under the assumption that there will be no other interfering device (e.g., Bluetooth, ZigBee, or other Wi-Fi APs) near the UE. The proposed scheme uses PPS detection, and in this region efficient HO/VHO is conducted

Problem Description
Proposed Scheme
Performance Evaluation
Conclusion
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