Uplink Control Information Coordination in Shared Spectrum
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Solution Overview
Problem
In wireless communication systems, especially in shared frequency bands, there is a challenge in coordinating Uplink Control Information (UCI) transmission and managing interference between access points, which affects spectral efficiency and overall system capacity.
Innovation Solution
The method involves sending a UCI payload indicator via Downlink Control Information (DCI) signaling to configure UCI transmissions, using a System Frame Number (SFN) indicator on the Physical Downlink Control Channel to facilitate random access procedures, and processing downlink signal strength for open loop power control, thereby improving coordination and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If small cell access points are deployed in unlicensed frequency spectra to increase spectral efficiency and system capacity, then spectral efficiency and system capacity are improved, but interference between small cell access points and operators increases as they compete for access to wireless resources
Solution Approach 1:
The patent applies preliminary action by implementing Listen Before Talk (LBT) procedures and contention-based access mechanisms before actual transmission. Devices perform channel sensing and random backoff procedures in advance to detect and avoid collisions, thereby reducing interference while maintaining system capacity in unlicensed spectra
Solution Approach 2:
The patent uses interference coordination mechanisms as intermediaries between competing transmitters. Base stations and user equipment employ scheduling algorithms and power control as mediating controls to manage resource allocation and minimize harmful interference while preserving spectral efficiency
2Productivity
If multiple devices compete for access to wireless resources in shared frequency bands, then system capacity increases, but coordination of UCI transmissions becomes challenging affecting reliability
Solution Approach 1:
The patent segments UCI transmission resources by allocating dedicated PUCCH resources, PUSCH opportunities, and PRACH preambles to different user equipment. This segmentation of uplink control channels ensures reliable coordination even when multiple devices compete for wireless resources in shared bands
Solution Approach 2:
The patent implements feedback mechanisms where user equipment sends UCI acknowledgments and channel state information back to base stations. This feedback loop enables dynamic adaptation of resource allocation and power control, maintaining reliable UCI transmission coordination in competitive environments
Data Source
AI summary
Techniques for managing uplink communication on a wireless communication medium are disclosed.