LTE UE Interference Cancellation Using Precoder Resource Bundling Detection
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Solution Overview
Problem
In wireless communication networks, particularly in LTE systems, user equipment (UE) faces difficulties in decoding signals from macrocells due to interference from neighboring small cells, leading to challenges in establishing communication links, as existing interference cancellation techniques are not effectively adapted to handle precoder resource bundling in neighboring cell transmissions.
Innovation Solution
The UE evaluates the presence of precoder resource bundling in interfering signals from neighboring base stations and modifies its interference cancellation/interference suppression (IC/IS) operations accordingly, using information about bundling to enhance the cancellation of interfering signals, including physical resource block bundling across frequency or subframe bundling across time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing interference cancellation techniques are used, then interference suppression is provided, but the techniques are not effectively adapted to handle precoder resource bundling in neighboring cell transmissions, reducing effectiveness
Solution Approach 1:
The interference cancellation technique dynamically adapts its operation based on detected precoder resource bundling patterns in neighboring cell transmissions. The system adjusts its cancellation strategy by identifying bundled resource blocks and modifying channel estimation procedures accordingly, transitioning from a static to a dynamic approach that responds to actual network conditions
Solution Approach 2:
The system changes operational parameters of the interference cancellation algorithm based on detected precoder resource bundling characteristics. When bundling is detected, the system modifies parameters such as channel estimation methods and interference subtraction techniques to match the bundled resource structure, thereby improving cancellation effectiveness
2Reliability
If interference cancellation operations are performed without evaluating precoder resource bundling, then processing complexity is reduced, but IC/IS effectiveness deteriorates
Solution Approach 1:
The system performs preliminary detection and evaluation of precoder resource bundling characteristics before executing interference cancellation operations. By identifying bundled resource blocks in advance and determining the bundling pattern, the system prepares appropriate cancellation strategies beforehand, avoiding complex real-time adjustments during the actual cancellation process
Solution Approach 2:
The interference cancellation process is segmented into distinct stages: detection of precoder resource bundling, evaluation of bundling characteristics, and execution of tailored cancellation operations. This segmentation allows the system to manage complexity by handling each stage separately with appropriate algorithms optimized for that specific task
3Productivity
If resource bundling is present in neighboring cell transmissions, then spectral efficiency is improved, but interference patterns become more complex, challenging existing IC/IS methods
Solution Approach 1:
The system employs feedback mechanisms where the detected interference patterns and precoder resource bundling characteristics are continuously monitored and used to adjust subsequent interference cancellation operations. The system learns from observed interference patterns and refines its detection and cancellation strategies based on feedback from previous operations
Solution Approach 2:
The system introduces an intermediary evaluation stage that analyzes precoder resource bundling characteristics before applying interference cancellation. This intermediary layer translates complex bundled interference patterns into a format that can be effectively processed by cancellation algorithms, acting as a mediator between the raw interference signals and the cancellation operations
Data Source
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AI summary
Methods, systems, and devices are described for interference cancelation/interference suppression (IC/IS) of neighbor cell transmissions. A UE may receive a downlink transmission from a base station and also receive interfering signals from one or more neighboring base stations. The UE may be configured to perform IC/IS operations on the interfering signals. In order to enhance IC/IS operations, the UE may evaluate whether resource bundling is used for the interfering signals. The UE may modify IC/IS operations for one or more subframes responsive to the evaluation. Modifying IC/IS operations may include, for example, using information related to the bundling at the neighboring base station(s) to cancel the interfering signals from the base station(s).