Scheduling User Determination via Pre-Determined Transmit Weights
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Solution Overview
Problem
In distributed network architectures, the high signal transmission delay between inter-station neighboring cells leads to low interference avoidance reliability due to the inability to adjust transmit weights in real-time, resulting in invalid weights during actual scheduling moments.
Innovation Solution
A method for determining a scheduling user involves calculating the SINR of each user in a cell based on pre-determined transmit weights without adjusting the weights, allowing for accurate selection of a target scheduling user using SINR calculation formulas specific to TDD and FDD systems, thereby improving interference avoidance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmit weights are adjusted in real-time to achieve interference avoidance, then interference avoidance reliability is improved, but signal transmission delay increases due to distributed network architecture
Solution Approach 1:
The patent applies preliminary action by pre-determining transmit weights at a first moment and using them for scheduling decisions at a second moment. The base station calculates SINR values and determines the target scheduling user in advance, before the actual data transmission occurs. This allows the system to prepare interference avoidance strategies proactively, ensuring that weights are optimized for the scheduled user while accounting for the inherent delay in distributed network architectures.
2Power
If transmit weights are adjusted dynamically to avoid interference, then system gain is improved, but weight validity decreases due to delay in distributed architecture
Solution Approach 1:
The system performs preliminary weight adjustment by determining the target scheduling user and calculating appropriate transmit weights before actual data transmission. The base station uses the pre-determined weights from the first moment for scheduling decisions at the second moment, ensuring weights remain valid and effective for interference avoidance throughout the transmission process.
Solution Approach 2:
The patent implements feedback mechanisms where the base station calculates SINR values for multiple users based on pre-determined transmit weights and channel state information. The system uses this feedback to select the optimal target scheduling user whose SINR meets the required threshold, ensuring that the transmit weights are appropriately matched to the actual channel conditions and user requirements, thereby maintaining weight validity.
3Measurement precision
If SINR calculation is performed for each user to select target scheduling user, then scheduling accuracy is improved, but calculation complexity increases
Solution Approach 1:
The patent applies local quality by focusing SINR calculations and detailed analysis only on the target scheduling user who meets the selection criteria, rather than uniformly processing all users. The base station first identifies candidate users based on preliminary criteria, then performs comprehensive SINR calculation and weight validation specifically for the selected target user. This localized approach maintains high scheduling accuracy while reducing overall calculation complexity.
Data Source
AI summary
A method and an apparatus for determining a scheduling user and a system. The method includes: determining a first pre-scheduling user at a second moment from a user in the first cell at a first moment; determining a first transmit weight of the first cell at the second moment; receiving a second transmit weight at the second moment that is sent by a second base station to which a second cell belongs in a data transmission system; calculating a signal to interference plus noise ratio SINR of each user in the first cell at the second moment based on the first transmit weight and the second transmit weight; and selecting a target scheduling user at the second moment from the user in the first cell based on the SINR of each user at the second moment.