Distance-Based Neighborhood Scanning for Handover Purposes in Network with Small Cells (original) (raw)

Energy Efficient Small-Cell Discovery Using Users’ Mobility Prediction

Lecture Notes in Computer Science, 2015

ABSTRACT Deployment of small cells (i.e., picocells and femtocells) within macrocell coverage is seen as a cost-effective way to increase system capacity and to equip wireless WANs with the ability to keep up with the increasing demand for data capacity. Existing cell discovery mechanisms are tailored for homogeneous networks (macrocells only). User Equipment (UE) cannot efficiently save energy in the process of small cells detection in order to exploit offloading opportunities provided by such heterogeneous deployments. In this paper, we propose a Mobility Prediction aware Scanning Start Time Estimation (MPSTE) scheme to discover/detect small cells efficiently in terms of energy. Based on the current data on road segments (e.g., density of road segment, UEs’ speeds and physical aspects of road segment) and current behaviour of UEs on the road segment, MPSTE allows deriving the time interval UE will spend in the small cell and making decision to perform handoff or no; if handoff is necessary, MPSTE derives the best time to begin the scanning process to discover small cells. Simulation results show the benefits of MPSTE over existing schemes in terms of energy saving by UEs.

The Lookahead Strategy for Distance-Based Location Tracking in Wireless Cellular Networks

—Based on a multi-scale, straight-oriented mobility model, this paper presents a lookahead strategy for distance-based location tracking so the rate of location update can be reduced without incurring extra terminal paging costs. For linear mobility graphs, the optimal registered cell is found by an iterative algorithm so the average cycle length is maximized. For planar mobility graphs, the authors employ the results from linear cases to determine the eligible registered cell. Performance gain is evaluated by using Monte Carlo simulation for mobiles with different degrees and scales of mobility. Analysis shows that the tracking cost for mobile users with large mobility scales in microcellular networks, costs which are usually underestimated by the traditional random walk model, can be effectively reduced.

Handover in a micro-cell packet switched mobile network

Wireless Networks, 1996

ABSTRACT This paper proposes a distributed handover protocol for a micro-cell packet switched mobile network. In such a network, users move from one cell to another very often, and each change of location may result in misrouted and lost packets. The purpose of the new protocol is to minimize these consequences of location changes: as long as a mobile moves from one cell to another but stays in the same region, the protocol avoids loss of packets and preserves order of transmission. Thus it increases the performance of the transport layer protocol by minimizing the need to retransmit packets