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This paper analyzes the performance of RACH-based small data transmission scheme for LTE/LTE-A networks. Power consumption at random access, signaling, and data transmission phases are analyzed. The energy efficiency of the scheme under different number of preambles, offered loads, packet size and packet inter-arrival time is investigated. The results show that RACH-based small data transmission scheme...
Long-term evolution (LTE)-based vehicular-to-everything (V2X) service is one of the promising technologies for supporting intelligent transportation systems (ITSs). LTE adopts a request-grant approach for allocating wireless resources. Each user follows a contention-based random access (RA) procedure to transmit its request. However, this procedure may result in unbounded delay if too many users compete...
This paper presents an iterative contending-user estimation method to analyze the normalized throughput, the packet-dropping probability, the average access delay, and the variance of the access delay for finite-population slotted ALOHA system supporting multiple access-class traffic. We demonstrate the way to extend the model to accurately predict the access delay of small data transmissions in OFDMA...
For LTE-A TDD systems supporting DL heavy asymmetry traffic, the number of downlink (DL) subframes are much higher than that of uplink (UL) subframes. The HARQ feedbacks of multiple DL tranport blocks may be transmitted in one UL subframe. Time-bundling is a technique proposed to reduce the HARQ signaling overhead by combining multiple ACK/NACKs into one using ‘AND’ operation. In this paper, we propose...
The performance of contention-based access mechanism mainly depends on the resource allocation. This paper presents a generalized resource allocation scheme to support access prioritization in a multichannel slotted ALOHA system. The proposed scheme has great usability as it can be implemented in any similar mechanism such as OFDMA, which is used in LTE and beyond. We simulate its access-success probability...
The ability to provide handset tracking or positioning system independent from the available commercial mobile network is required in emergency. In some cases, it is possible that the commercial mobile networks are suspended due to the natural disaster, terrorist attack or other emergency condition. The commercial mobile networks might also unavailable in the remote areas where some extreme sports...
This paper reviews node failure detection method in ZigBee loop network. ZigBee network was popularly used for low power and low cost implementation of wireless data transmission. Node failure detection is needed in order to maintain the network reliability. Common node failure detection methods are based on ZigBee mesh networking capability. But in many application areas which have simple loop topology,...
In this paper, we present a new concept of ZigBee backbone by utilizing ZigBee technology for the use of low-rate wireless medium-distance link. The backbone is mainly used for connecting sensor devices around the backbone location to the gateway device. Non-beacon enabled ZigBee operation mode is considered in this backbone with ring topology enhanced by dual-hop coverage setting. We present an analytical...
Group paging can simultaneously activate hundreds of user equipments (UEs) using a single paging message. Upon receiving the group paging message, all UEs should immediately transmit their paging response messages through the random access channels (RACHs). Simultaneous channel access from a huge group of UEs may result in severe collisions of the RACHs during a very short period of time. In this...
Several research effort in recent years has shown its significant interest in the development of security measure in the routing of Mobile Ad-hoc Network (MANET). Ad-hoc On-demand Distance Vector (AODV) routing protocol has been one of the basic protocol that is modified to cope with security demands. This paper present an analytical model to evaluate the performance of AODV variant that is developed...
Group paging is one of the mechanisms proposed to resolve the radio access network (RAN) overload problem resulted from simultaneous channel access from huge machine devices [1]. This paper presents a consecutive group paging to enhance the performance of group paging. In consecutive group paging, the base station reserves multiple paging cycles to page the same group of users consecutively such that...
Speech feature can be an alternative interaction model for embedded device that is designed without many buttons for control. In this work, we create colorblind aid system. This paper compares speech feature created using SAPI5.1 with speech feature created manually using phoneme concatenation and DTW, and assess their performance in WinCE6 and WES09 embedded OS environment. The testing for speech...
People with color blindness often have difficulty in distinguishing certain colors. People with total color blindness can only see things in black, white, and gray. Deficiency of color perception is causing many problems for people with color blindness, from daily activities to educational issue. One solution to help this problem is to build an aid system using image processing techniques and applying...
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