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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