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摘要

A method for generating a connectivity tree for use in determining a connection route between a first wireless unit and any of a number of other wireless units comprises s in the first wireless unit, receiving address and topology information from each of the other wireless units, wherein the address and topology information comprises an own address from each of the other wireless units and only first order address lists from each of the other wireless units; and in the first wireless unit, generating n connectivity rings from the first order address lists, wherein n is a positive integer, and wherein each of the connectivity rings is generated in accordance with a rule that a higher-numbered connectivity ring cannot include nodes representing units that are already represented by a node in a lower-numbered connectivity ring.