To solve the above problem,two spectrum allocation algorithms,which included spectrum allocation algorithm based on user requirement and joint proportional fairness algorithm,were proposed.

Introduction the connotation and development process of user requirement,information service mode and the corresponding concepts,this paper suggests that the library should innovate its service idea as user-centered one.

A new business model starting from user requirements is introduced.

Based on the investigation results on user needs of academic libraries, this paper analyses the problems in collection development and information service of academic libraries and proposes that academic libraries should accordingly construct and adjust the collection system and information service system in IT Environment.

This paper analysis the decisive function of user\'s needs in product design contents, the systematic analysis and classification methods of the user needs, and make some different examples to explain the application of this systematic analysis in product design process.

This paper introduces the features of user demand under the network environment,and puts forward some concrete tactics for the development of digital information resources of library.

In order to update the user demand record in real time, a questionnaire on user demand is set up.

This paper expounds the concept and connotation of Information service, and analyzes on the present situation and developing prospect of library s information service from the user demand, the service mode, and the conceptual innovation, etc.

It is analyzed the characteristics of users demand and proposed the strategies to better the users knowledge expectation.

This paper analyzed the empirical collective behavior of user requirements in a region,and discovered that the frequency and the in-degree distributions of bipartite networks constructed by user visiting web sites fo.