Dynamic allocation of satellite capacity through packet reservation
AFIPS '73 Proceedings of the June 4-8, 1973, national computer conference and exposition
White space networking with wi-fi like connectivity
Proceedings of the ACM SIGCOMM 2009 conference on Data communication
A distributed opportunistic access scheme and its application to OFDMA systems
IEEE Transactions on Communications
| Hi-index | 0.00 |
Real-time transmission of smart meter measurement data is investigated. A contention based approach exploiting the unused cellular spectrum, e.g. of 4G Long Term Evolution (LTE), is proposed. The proposed approach uses subsets of LTE resource blocks (RBs) as allocation units. It is based on channel aware reservation slotted Aloha over orthogonal frequency division multiple access (OFDMA) using time/frequency slots, which leads to a reduction of collision probability, prevents collisions in the transmission phase, and allows detecting these collisions at the reservation phase. The proposed method relies on an access point (AP) that indicates the ''available'' OFDMA subcarriers to the contending devices after receiving this information through coordination with the cellular base station (BS): The BS informs the AP of the LTE RBs that it intends to keep free for a certain time period (e.g., because the current load on the network does not mandate their allocation to primary cellular users). Then, with the proposed approach, the AP transmits pilot signals on the free channels so that they can be used by the contending devices. Simulation results show that a large number of smart meters can be successfully accommodated within a limited coverage area with the proposed approach, while transmitting their measurement data in real-time.