Abstract: A method for channel quality estimation is executable by a network device. The network device divides channels into a plurality of groups according to a number of channels available in a competing network environment in which the first network device is located, and selects a representative channel from each of the plurality of groups which is central to the frequencies of each available competing channel. The selected representative channels are each tested and each of the channel quality estimations is taken as channel quality estimation of all channels of a group, to save time in estimating and increase efficiency.

Abstract: An apparatus and method for transmitting a plurality of data packets of a plurality of nodes in a wireless sensor network. The plurality of data packets includes a plurality of original data values. The apparatus deleting the one of the plurality of original data values in accordance with a determination that an absolute difference between one of the plurality of original data values and a first preset value is smaller than a second preset value, or storing the one of the original data values in a database as an optimized data and setting the first preset value as the one of the original data values.

Abstract: An apparatus and method for transmitting a plurality of data packets of a plurality of nodes in a wireless sensor network. The plurality of data packets includes a plurality of original data values. The apparatus deleting the one of the plurality of original data values in accordance with a determination that an absolute difference between one of the plurality of original data values and a first preset value is smaller than a second preset value, or storing the one of the original data values in a database as an optimized data and setting the first preset value as the one of the original data values.