This paper provides stability and instability conditions for slotted Aloha under the exponential backoff (EB) model with geometric law i 7→ b0 , when transmission buffers are in saturation, i.e., always full. In particular, we prove that for any number of users and for b > 1 the system is: (i) ergodic for i0 > 1, (ii) null recurrent for 0 < i0 ≤ 1, and (iii) transient for i0 = 0. Furthermore, w...

Mobile inventory control system involves large number of highly mobile and dispersed databases in the form of RFID (radio frequency ID) tag devices. Radio tags have limited communication range, bandwidth, computing power and storage. We examine some critical impact of these characteristics on design of facilities and techniques required for supporting integrated mobile distributed databases and...

This paper presents achievable regions in slotted ALOHA throughput both without and with network coding for one-relay twohop wireless networks between two end node groups. In this paper, there are no restrictions on the total traffic and the number of end nodes per group. It follows that the relay node will be generally involved with asymmetric bidirectional traffic. This paper derives closed-f...

Passive UHF RFID systems using Dynamic Frame-Slotted ALOHA (DFSA) adjust the frame size according to the number of tags, but frame size N is equals to 2^Q and cannot be adjusted exactly to the number of tags to be identified. In this paper, we proposed a new Aloha based anti-collision algorithm which divides the tags and adjusts the frame sizes in such a manner as to always keep the system effi...

In this work, the integration of multi-access edge computing (MEC) with wireless power transfer (WPT) and slotted-ALOHA (SA) is investigated. All aforementioned technologies are considered key enablers for future Internet Things networks, therefore, their interaction great significance. To that end, an energy efficient medium access protocol designed, where each powered device (WPD) harvests in...

In multihop packet radio networks with randomly distributed terminals, the optimal transmission radii to maximize the expected progress of packets in desired directions are determined with a variety of transmission protocols and network configurations. It is shown that the FM capture phenomenon with slotted ALOHA greatly improves the expected progress over the system without capture due to the ...

In this paper we study the effect of exponential backoff on the performance of network coding in a simple ad hoc network working based on slotted Aloha. To this end, we devise an analytical model based on an open multi-class queueing network to represent our scenario. In this model, by mapping backoff status of packet transmissions onto suitable classes of customers on one hand, and employing t...

There is a strong likelihood that future wireless communication systems will employ packetisedtransmission techniques. Such an approach would provide a number of benefits, including theability to integrate with emerging wired systems based on Asynchronous Transfer Mode (ATM).In addition, packet-based wireless networks would allow for diverse traffic types and inparticular, speec...