Bandwidth self-adaption method

The invention discloses a bandwidth self-adaption method. The method comprises the following steps: dividing a bandwidth used in a wireless spread spectrum network into N levels, wherein N is a positive integer, and the bandwidth m=1, 2. . . . . ., and the bandwidth corresponding to the N gradually decreases with the increase of m; setting m=1, setting a parent node, firstly networking the parentnode and each child node by using the mth bandwidth in a networking process, in the case of networking success, allocating the maximum allowable bandwidth to the child node, and receiving, by the parent node, the data transmitted by the child node, and in the case of networking failure, screening out the child nodes subjected to the networking failure, setting m=m+1, networking the parent node andthe child nodes subjected to the networking failure by using the m bandwidth, and performing circulation. According to the method, the multi-round networking technology is adopted, so that each childnode obtains a suitable bandwidth value, the defects of low narrowband bandwidth instantaneity and low broadband bandwidth success rate in the case that there is only one fixed bandwidth in the traditional mode are overcome, and the contradiction between long centralized meter reading time and high meter reading yield is solved.