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US 8,948,120 B2Granted
Exploiting hybrid-channel information for downlink multi-user scheduling
AssigneeNEC Laboratories America, Inc.
InventorsNarayan Prasad, Sampath Rangarajan, Wenzhuo Ouyang
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Abstract
A method for determining an optimal network utilization maximization in a communication system with wireless links in which current and coarse channel state information CSI is available from all users, along with a limited amount of fine CSI by way of a frame based entails a scheduling and feedback under which a virtual queue is associated with each user with virtual rates being determined at start of each frame and policy of each frame being determined by solving a decision process.
Claims10
A method comprising steps:
- determining an optimal network utilization maximization in a communication system with wireless links in which current and coarse channel state information CSI is available from all users, along with a limited amount of fine CSI by way of a frame based scheduling and feedback under which a virtual queue is associated with each user with virtual rates being determined at start of each frame and policy of each frame being determined by solving a decision process, said determining comprising:
- initializing an index indicative of an interval, a system state and control parameters;
- if the interval is not the start of a frame then:
- determining action for current interval using system state for current interval and state action frequencies computed for the current frame;
- performing action for current interval;
- updating virtual queues and incrementing the interval index;
- updating system state for the current interval
- wherein the system state at any interval consists of coarse channel estimates reported by all users for that interval, the system state includes for each possible pair of users, the fine and coarse channel estimates from both users in that pair for the recent-most prior interval on which that user pair was scheduled and the index of that interval and wherein the above steps are carried out by computer processing.
5 more elements
A system comprising:
- a communication system with wireless links in which current and coarse channel state information CSI is available from all users, along with a limited amount of fine CSI by way of a frame based scheduling and feedback under which a virtual queue is associated with each user with virtual rates being determined at start of each frame and policy of each frame being determined by solving a decision process for determining an optimal network utilization maximization, the system includes computer processing for carrying out the following:
- initializing an index indicative of an interval, a system state and control parameters;
- and
- if the interval is not the start of a frame then:
- determining action for current interval using system state for current interval and state action frequencies computed for the current frame;
- performing action for current interval;
- updating virtual queues and incrementing the interval index;
- and
- updating system state for the current interval,
- wherein a system state at any interval includes coarse channel estimates reported by all users for that interval, the system state including for each possible pair of users, fine and coarse channel estimates from both users in that pair for the recent-most prior interval on which that user pair was scheduled and an index of that interval.
7 more elements
Dependencies are inferred from the claim text.