Power Randomization for Interference Cancellation
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Solution Overview
Problem
Existing approaches to interference cancellation in cellular communication, such as semi-static resource allocation and MIMO coordination, face challenges in achieving fast and accurate power adaptation and channel state information sharing, especially in cross-cell scenarios, leading to inefficiencies and complex coordination overhead.
Innovation Solution
The solution involves a UE proactively requesting power adjustments and randomizing transmission powers across resource elements, using pseudorandom sequences to create a difference in signal and interference power levels, thereby reducing the need for complex cross-cell coordination and improving interference cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If semi-static resource allocation (eICIC, FFR) is employed to mitigate interference, then interference between cells is reduced, but resource allocation complexity and coordination overhead increase
Solution Approach 1:
The patent changes the power parameter dynamically across resource elements using pseudorandom sequences. By varying transmission power levels according to predefined patterns known to both transmitter and receiver, the system achieves interference mitigation without complex coordination, as the power variations are predetermined rather than negotiated in real-time
Solution Approach 2:
The patent applies preliminary action by pre-configuring pseudorandom power adjustment patterns at the transmitter before actual data transmission. These patterns are predetermined and synchronized between cells, allowing interference cancellation to work effectively without requiring complex real-time coordination during operation
2Object-affected harmful factors
If MIMO coordination across cells is used to spatially separate UEs, then interference is reduced, but accurate and fast channel state information sharing becomes challenging
Solution Approach 1:
The patent extracts the interference mitigation function from complex MIMO coordination and channel state information sharing. By using pseudorandom power adjustments at the transmitter side with corresponding cancellation at the receiver, the system achieves interference reduction without requiring accurate cross-cell channel state information exchange
3Measurement precision
If power adaptation is implemented to improve interference cancellation, then signal detection improves, but coordination overhead and system complexity increase
Solution Approach 1:
The patent applies self-service by enabling each cell to independently generate and apply pseudorandom power adjustment patterns without requiring coordination with neighboring cells. The interference cancellation is achieved through these autonomous, pre-synchronized patterns, eliminating the need for complex inter-cell coordination mechanisms while maintaining improved signal detection
Data Source
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AI summary
Embodiments described herein relate generally to a communication between a user equipment ("UE") and an evolved Node B ("eNB"). A UE may be adapted to signal to an eNB a request to adjust a downlink transmission power level. Based on the request, the eNB may adjust its downlink transmission power level. In another embodiment, an eNB may be adapted to adjust its downlink transmission power level according to a pseudorandom sequence. This pseudorandom sequence may be generated from a seed, which the eNB may signal to a UE. Based on power adjustments and/or randomizations, a UE may perform interference cancellation. Other embodiments may be described and/or claimed.