Spectrum Availability in Indoor Locations for Opportunistic Spectrum Access in Dense Urban Scenarios

Abstract

Abstract-This paper analyses the possibility to exploit opportunistic spectrum access (OSA) for short-range radio communication systems within indoor locations in dense urban areas. In particular, considering the service area of a primary system devoted to providing outdoor coverage in a dense urban scenario, the percentage of indoor locations where the secondary users can reuse the primary frequency band without disturbing the primary system or being disturbed is estimated. The analysis considers heterogeneous path loss models for the primary and secondary systems encompassing the characterization of outdoor, indoor and building penetration losses. Obtained results quantify how aspects like the location of the primary network elements and the considered interference margins to protect primary transmissions impact on the spatial availability of the primary band within the interior of the buildings.

Algorithm’s Design in MATLAB using a RTL Device as a Spectrum Meter of the UHF Band to evaluate the Temporary and Space Availability of Individual and Joint Television Channels in Ecuador

“…In Figure 8 [6] it is observed that during the process of the measurement weeks, certain channels such as 519 Mhz have extremely low levels (Pr ant <= 47 dBm) and there is not much variability of them, which allows to conclude that they are available for its reuse with Opportunistic Spectrum Access (OSA) systems. In the same way, channel 2 (512 -518 Mhz) has apparently high levels during the week (Pr ant -28 dBm).…”

Optimal Wireless Sensor Networks Allocation for Wooded Areas Using Quantum-Behaved Swarm Optimization Algorithms

“…Electronic devices and their exponential growth have already led to the use and analysis of vegetation propagation models in different environments, e.g., [30] describes signal loss models in urban environments, closed spaces as rooms, and open spaces; for example, the building's roof. These documents are helpful for studies based on urban or suburban locations but not for forest environments.…”

A channel allocation algorithm for OSA-enabled IEEE 802.11 WLANs

“…It is worth noting that both receiver protection margins, M S and M P , would account for the fading margin along with the minimum required signal-tointerference ratio. Summing up, the possibility to use a given primary channel within a WLAN is subject to the accomplishment of both aforementioned usage conditions [6]. Notice that within a WLAN, the AP and its associated stations behave indistinctly as SU transmitters or receivers).…”

“…Frequency assignment is calculated from primary channels in the same way that for secondary band (line [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Also, if dp=0, the channel assigned is the available primary channel which minimizes the IP.…”