Adaptive CQI-based HSDPA flow control method
AssigneeKing Fahd University of Petroleum and Minerals
InventorsAbdulmohsen M. Almutairi, Uthman A. Baroudi
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Abstract
The adaptive CQI-based HSDPA flow control method selectively eliminates flow control to greatly improve scheduler performance and increase the overall system throughput at low traffic load in a 3G High Speed Downlink Packet Access system. The method utilizes channel quality information (CQI) to predict potential handover conditions and adjusts the degree of flow control applied to classes of users to tune buffer levels accordingly. By regulating buffer levels, the adaptive HSDPA flow control method improves scheduler performance and significantly reduces handover data loss, thereby enhancing the effective Transmission Control Protocol (TCP) throughput.
Claims9
A computer-implemented adaptive CQI-based HSDPA flow control method, comprising the steps of:
- computing an average Channel Quality Information (CQI) for each user in an HSDPA (High Speed Downlink Packet Access) cell;
- dividing the users into a plurality of classes based on the average CQI computation for each of the users, the classes including:
- a first class representing a most conservative credit allocation policy having a maximum of lub flow control;
- a last class representing a most generous credit allocation policy having virtually no lub flow control;
- and
- at least one intermediate class representing an intermediate credit allocation policy having intermediate lub flow control;
- allocating lub flow control for each of the users according to the user's class associated credit allocation policy;
- and
- sending a capacity allocation command based on the lub flow control allocating step to update the outstanding credits at a Radio Network Controller (RNC) for each of the users.
Dependencies are inferred from the claim text.