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Table 2 Notations

From: An unequal redundancy level-based mechanism for reliable data collection in wireless sensor networks

parameter Meanings
p c Link loss rate
p e End-to-end reliability of data packets
m i The redundancy level for nodes in the i th loop under URL scheme
m The nodes’ redundancy level of each loop under ERL scheme
p The reliability to next hop under ERL scheme
p i The reliability of the i th loop to next hop under URL scheme
\( \widehat{N} \) The amount of data of each packet in linear network
\( {\widehat{N}}_m \) The number of data transmission to next hop in linear network
\( {\zeta}_{{}_l}^{e,t} \) The transmit data sizes for the nodes that are l distance to sink under ERL scheme
\( {\zeta}_{{}_l}^{e,r} \) The received data sizes for the nodes that are l distance to sink under ERL scheme
\( {E}_{{}_l}^e \) The energy consumption of the nodes that are l distance to sink under ERL scheme
\( {\zeta}_{{}_l}^{u,t} \) The transmit data sizes for the nodes that are l distance to sink under URL scheme
\( {\zeta}_{{}_l}^{u,r} \) The received data sizes for the nodes that are l distance to sink under URL scheme
\( {E}_{{}_l}^u \) The energy consumption of the nodes that are l distance to sink under URL scheme
ϕ The percentage of enhancing the reliability
Ω The percentage of prolonging the network lifetime
\( {R}_{D_{URL}} \) The network latency incurred by URL scheme