Increasing Forward Link Performance of 1xEV-DO using early terminated Channel Quality Information

The present suite of 3G wireless network standards make use of forward link channel quality reports to more efficiently schedule users on a forward time-shared packet data channel. As the feedback rate and precision of these reports is increased, the performance of the scheduling decision is also increased since it is based on more recent and accurate data. However, this also increases the reverse link resources needed for these reports. In order to reduce the mobile power required to make these reports, some standards (e.g., IxEV-DO (N. Bhushan et al., 2006) (2004)) take advantage of time diversity gains by repeating the report for a specified number of times but with an overall reduction in the power required. Naturally this reduces the maximum rate at which these reports can be made and increases the staleness of the information provided to the scheduler. The users with the poorest reverse link conditions dictate the number of repetitions. This means that reports made by users in good radio conditions will likely be received after a smaller number of repetitions. Presently the scheduler does not use these early terminated reports in making scheduling decisions. In this paper we show that if the scheduler uses this information then the forward link performance can be increased