Low Complexity MIMO Receiver Scheduling for Collision Reduction
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Solution Overview
Problem
Higher order MIMO systems face challenges in reducing uplink-downlink collisions, which degrade performance due to the complexity and cost of supporting multiple receiver chains, especially in devices where interference from adjacent channels is not filtered out.
Innovation Solution
A method and apparatus for wireless communication that involves receiving a capabilities indicator from UEs with low-complexity diversity receivers and scheduling uplink and downlink transmissions to minimize collisions below a threshold, using processor-controlled scheduling based on the indicator to optimize transmission and power settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher order MIMO systems use multiple receiver chains to support diverse reception, then the system capacity and performance are improved, but the device complexity and cost increase significantly
Solution Approach 1:
The patent extracts and removes the filtering function from the receiver chain, eliminating the need for complex filters in low-complexity diversity receivers. This allows the system to support multiple receiver chains without proportionally increasing device complexity and cost.
Solution Approach 2:
The patent changes the operational parameters of the receiver by operating without traditional filtering, allowing the system to achieve diverse reception capabilities with simplified receiver chains that have reduced complexity and cost.
2Device complexity
If low-complexity diversity receivers are used to reduce device complexity, then the cost and complexity are reduced, but uplink-downlink collisions increase and degrade performance
Solution Approach 1:
The patent implements feedback mechanisms where the base station receives capability indicators from UEs about their low-complexity receiver status, and the scheduler uses this feedback to adjust uplink-downlink scheduling decisions, thereby reducing collisions for UEs with low-complexity receivers.
Solution Approach 2:
The patent introduces dynamic scheduling that adapts to the capabilities of individual UEs. The base station dynamically adjusts the scheduling of uplink and downlink transmissions based on real-time capability indicators, making the system flexible enough to protect low-complexity receivers from harmful collisions while maintaining overall system efficiency.
3Reliability
If traditional filtering is applied to remove adjacent channel interference, then the receiver performance is improved, but the device complexity and cost increase
Solution Approach 1:
The patent extracts the filtering function from the receiver chain entirely, demonstrating that traditional filters are not necessary for low-complexity diversity receivers. The system achieves adequate interference rejection without incorporating complex filtering hardware.
Solution Approach 2:
The patent replaces expensive, complex filtering hardware with a simpler, more cost-effective approach that uses scheduling and capability indication mechanisms instead of physical filters, significantly reducing device cost and complexity.
Data Source
AI summary
Low complexity, high order multiple input, multiple output (MIMO) operations are described in which a user equipment (UE), configured with at least one normal performance receiver chain and at least one low-performance, low-complexity diversity receiver chain, signals a capabilities indicator identifying existence of the low-performance diversity receivers. Using the UEs capabilities, a serving base station may schedule uplink and downlink transmissions for the UE to reduce uplink-downlink collisions below a minimum threshold number. The serving base station may also take UE transmit power into consideration for signaling power control or modulation and coding schemes in order to minimize potential interference cause by UE transmissions. For channel state feedback, the UE may provide different channel feedback for uplink-downlink collision subframes and non-collision subframes.