Table 1.
The definitions of symbols used in this paper.
| Sn | Sensor node n |
| polyC(Sn) | The communication area of Sn under the polygon model |
| (Rci, θci) | The ith vertex of polyC(Sn) |
| polyS(Sn) | The sensing area of Sn under the polygon model |
| (Rsi, θsi) | The ith vertex of polyS(Sn) |
| Area | A field |
| AreaC(Sn) | The communication area covered by polyC(Sn) in a field |
| AreaS(Sn) | The sensing area covered by polyS(Sn) in a field |
| Loc(Sn) | The location of Sn in a field |
| Rot(Sn) | The rotation degree of Sn counterclockwise from 0° in a field |
| Pi | Point i of a field |
| Rc(Sn, Pi) | The communication range of Sn in the direction of Pi |
| Rs(Sn, Pi) | The sensing range of Sn in the direction of Pi |
| θ(Sn, Pi) | The angle between ray SnPi and the 0° ray originating at Sn |
| d(Sn, Pi) | The Euclidean distance between Sn and Pi |
| ΔPaPbPc | The area formed by points Pa, Pb, and Pc |
| CCL(Sn, Pi) | The communication coverage level of Sn at Pi |
| SCL(Sn, Pi) | The sensing coverage level of Sn at Pi |
| W | A wireless sensor network |
| CR(Area,W) | The sensing coverage rate of W on Area |
| Square(Pi) | A square area centered at Pi |
| CR(Square(Pi), W) | The sensing coverage rate of W on Square(Pi) |
| NC(W) | The network connectivity of W |
| Sbase | Base node |
| Max_CCL | The maximum threshold of the communication coverage level |
| Max_SCL | The maximum threshold of the sensing coverage level |
| Score(Pi) | The score of a candidate position Pi |
| Rotstep | The rotation steps of Sn |
| Rc | The maximum communication range of a sensor node |
| Rs | The maximum sensing range of a sensor node |
| dmax | The maximum distance between sensor nodes |