Wireless Terminal Resource Segmentation for TDD Interference Control
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing duplex wireless transmissions, particularly in mitigating cross-link interference due to limited uplink coverage caused by TDD patterns that are either downlink or uplink heavy, leading to insufficient network capacity for simultaneous transmission and reception.
Innovation Solution
Wireless terminals employ filtering operations based on scheduling information to manage frequency resources, selectively filtering out reception power outside designated subsets within the serving cell frequency resources, and adjusting TDD patterns dynamically to optimize transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If TDD pattern is configured as downlink heavy, then downlink transmission capacity is improved, but uplink coverage deteriorates due to reduced maximum allowable transmission power
Solution Approach 1:
The frequency resources are segmented into a first subset and a second subset, with different TDD patterns applied to each subset. The first subset uses a downlink-heavy pattern for high downlink capacity, while the second subset uses an uplink-heavy pattern for improved uplink coverage, thereby resolving the contradiction between downlink transmission capacity and uplink coverage
Solution Approach 2:
Different TDD patterns are applied to different frequency resource subsets based on local requirements. The first subset is optimized for downlink transmission with a downlink-heavy pattern, while the second subset is optimized for uplink transmission with an uplink-heavy pattern, allowing each subset to have the quality characteristics needed for its specific function
2Reliability
If TDD pattern is configured as uplink heavy, then uplink coverage is improved, but downlink transmission capacity deteriorates due to reduced network capacity for downlink traffic
Solution Approach 1:
The frequency resources are segmented into a first subset and a second subset, with different TDD patterns applied to each subset. The second subset uses an uplink-heavy pattern for improved uplink coverage, while the first subset maintains a downlink-heavy pattern to preserve overall downlink transmission capacity
Solution Approach 2:
Different TDD patterns are applied to different frequency resource subsets based on local requirements. The second subset is optimized for uplink transmission with an uplink-heavy pattern, while the first subset is optimized for downlink transmission, allowing each subset to have the quality characteristics needed for its specific function
3Productivity
If simultaneous transmission and reception are implemented within frequency resources, then network capacity is improved, but cross-link interference increases
Solution Approach 1:
The frequency resources are segmented into a first subset and a second subset that are separated in frequency. By confining uplink transmissions to the second subset and downlink receptions to the first subset, the system enables simultaneous transmission and reception while minimizing cross-link interference through frequency separation
Solution Approach 2:
The harmful cross-link interference is extracted and isolated by separating uplink and downlink transmissions into different frequency subsets. The first subset is dedicated for downlink reception while the second subset is dedicated for uplink transmission, thereby taking out the interference problem from the simultaneous transmission/reception operation
Data Source
AI summary
A wireless terminal comprises receiver circuitry and processor circuitry. The receiver circuitry is configured to receive, over a radio interface, a serving cell frequency resource including a first subset of frequency resources. The processor circuitry is configured to determine, from the serving cell frequency resource, scheduling information for a physical channel; and then to use the scheduling information to either (a) filter reception power outside of the first subset of frequency resources, or (b) filter reception power outside of the serving cell frequency resource.