Limits...
Joint minimization of uplink and downlink whole-body exposure dose in indoor wireless networks.

Plets D, Joseph W, Vanhecke K, Vermeeren G, Wiart J, Aerts S, Varsier N, Martens L - Biomed Res Int (2015)

Bottom Line: Downlink dose reductions of at least 75% are observed when adding more base stations with a lower transmit power.Total dose reductions decrease with increasing uplink usage for WiFi due to the lack of uplink power control but are maintained for LTE and UMTS.For UMTS and LTE, an almost continuous uplink usage is required to have a significant effect on the total dose, thanks to the power control mechanism.

View Article: PubMed Central - PubMed

Affiliation: Information Technology Department, Ghent University/iMinds, Gaston Crommenlaan 8, 9050 Ghent, Belgium.

ABSTRACT
The total whole-body exposure dose in indoor wireless networks is minimized. For the first time, indoor wireless networks are designed and simulated for a minimal exposure dose, where both uplink and downlink are considered. The impact of the minimization is numerically assessed for four scenarios: two WiFi configurations with different throughputs, a Universal Mobile Telecommunications System (UMTS) configuration for phone call traffic, and a Long-Term Evolution (LTE) configuration with a high data rate. Also, the influence of the uplink usage on the total absorbed dose is characterized. Downlink dose reductions of at least 75% are observed when adding more base stations with a lower transmit power. Total dose reductions decrease with increasing uplink usage for WiFi due to the lack of uplink power control but are maintained for LTE and UMTS. Uplink doses become dominant over downlink doses for usages of only a few seconds for WiFi. For UMTS and LTE, an almost continuous uplink usage is required to have a significant effect on the total dose, thanks to the power control mechanism.

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Related in: MedlinePlus

Dwb-total distribution for a one-hour period when calling the entire hour for traditional deployment (top) and optimized deployment (bottom). FBS EIRP in dBm is indicated within hexagon.
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fig6: Dwb-total distribution for a one-hour period when calling the entire hour for traditional deployment (top) and optimized deployment (bottom). FBS EIRP in dBm is indicated within hexagon.

Mentions: Figure 6 shows the total whole-body dose (in μJ/kg) in a one-hour period in an adult man (“Duke,” see Section 2.2.3) when calling the entire hour, for the two configurations: traditional (top) and optimized (bottom). The traditional deployment shows that the total dose is highly close to the FBS (high downlink dose) and near the cell edges (high uplink dose). For the optimized deployment, locations close to the FBS have lower downlink doses, thanks to the lower FBS EIRP, and locations far from the FBS have lower uplink doses thanks to the presence of the additional FBS. Figure 6 clearly shows that the high doses (lighter colors) are lowered for the optimized deployment.


Joint minimization of uplink and downlink whole-body exposure dose in indoor wireless networks.

Plets D, Joseph W, Vanhecke K, Vermeeren G, Wiart J, Aerts S, Varsier N, Martens L - Biomed Res Int (2015)

Dwb-total distribution for a one-hour period when calling the entire hour for traditional deployment (top) and optimized deployment (bottom). FBS EIRP in dBm is indicated within hexagon.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4352489&req=5

fig6: Dwb-total distribution for a one-hour period when calling the entire hour for traditional deployment (top) and optimized deployment (bottom). FBS EIRP in dBm is indicated within hexagon.
Mentions: Figure 6 shows the total whole-body dose (in μJ/kg) in a one-hour period in an adult man (“Duke,” see Section 2.2.3) when calling the entire hour, for the two configurations: traditional (top) and optimized (bottom). The traditional deployment shows that the total dose is highly close to the FBS (high downlink dose) and near the cell edges (high uplink dose). For the optimized deployment, locations close to the FBS have lower downlink doses, thanks to the lower FBS EIRP, and locations far from the FBS have lower uplink doses thanks to the presence of the additional FBS. Figure 6 clearly shows that the high doses (lighter colors) are lowered for the optimized deployment.

Bottom Line: Downlink dose reductions of at least 75% are observed when adding more base stations with a lower transmit power.Total dose reductions decrease with increasing uplink usage for WiFi due to the lack of uplink power control but are maintained for LTE and UMTS.For UMTS and LTE, an almost continuous uplink usage is required to have a significant effect on the total dose, thanks to the power control mechanism.

View Article: PubMed Central - PubMed

Affiliation: Information Technology Department, Ghent University/iMinds, Gaston Crommenlaan 8, 9050 Ghent, Belgium.

ABSTRACT
The total whole-body exposure dose in indoor wireless networks is minimized. For the first time, indoor wireless networks are designed and simulated for a minimal exposure dose, where both uplink and downlink are considered. The impact of the minimization is numerically assessed for four scenarios: two WiFi configurations with different throughputs, a Universal Mobile Telecommunications System (UMTS) configuration for phone call traffic, and a Long-Term Evolution (LTE) configuration with a high data rate. Also, the influence of the uplink usage on the total absorbed dose is characterized. Downlink dose reductions of at least 75% are observed when adding more base stations with a lower transmit power. Total dose reductions decrease with increasing uplink usage for WiFi due to the lack of uplink power control but are maintained for LTE and UMTS. Uplink doses become dominant over downlink doses for usages of only a few seconds for WiFi. For UMTS and LTE, an almost continuous uplink usage is required to have a significant effect on the total dose, thanks to the power control mechanism.

Show MeSH
Related in: MedlinePlus