Cooperation for wireless network

Up to now, wireless networks has been developed to make users compete each other. For instant, the user scheduler in the cellular network selects the user whose wireless channel is the best of all. Therefore, each user report his status as accurate as possible. He doesn't care other user when he report his channel quality. Even though his channel is good, if he continuously report his good channel quality, the other use whose channel is worse will receives much lower speed data. Consider the case the high quality user becomes in bad condition, his receiving performance will be also bad. Therefore, we need some cooperation to avoid this phenomena. One emerging way to avoid this inequality is to use cooperative diversity.