Uplink Data Channel Collision Avoidance for eMTC-U
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Solution Overview
Problem
In wireless communication systems, especially in unlicensed RF spectrum bands, there is a high likelihood of collisions between uplink data communications and uplink control communications for enhanced machine-type communication user equipment (eMTC-u UE), leading to inefficient resource usage and potential delays in data transmission.
Innovation Solution
The proposed solution involves determining resource elements for cell-specific and UE-specific uplink control channels that are scheduled to collide with uplink data transmissions, and modifying the data transmission by deferring or multiplexing uplink control information to avoid these collisions, thereby optimizing resource usage and reducing delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink data transmissions are repeated due to poor channel conditions or cell edge location, then data transmission reliability is improved, but the likelihood of collisions with uplink control channel instances increases
Solution Approach 1:
The base station performs preliminary scheduling of uplink control channel instances before uplink data transmissions. By determining control channel resources in advance and configuring them to the UE, the system proactively avoids collisions rather than reacting to them. The base station schedules control channels in time-frequency resources that do not overlap with planned data transmissions, even accounting for potential repetitions.
Solution Approach 2:
The system dynamically adjusts the scheduling of uplink control channel instances based on current channel conditions and data transmission requirements. When poor channel conditions or cell edge location indicate likely repetitions, the base station modifies control channel scheduling in real-time to avoid collision with repeated data transmissions, making the system adaptive to changing conditions.
2Reliability
If uplink control channel instances are scheduled frequently to ensure reliable control signaling, then control communication reliability is improved, but resource efficiency deteriorates due to increased collision probability with data channels
Solution Approach 1:
The base station applies different scheduling strategies to different UEs based on their specific conditions. For UEs experiencing poor channel conditions or located at cell edges, the system provides more frequent and robust control channel scheduling. For UEs with good channel conditions, control channel scheduling is optimized to minimize resource usage. This localized approach ensures each UE receives appropriate control reliability without unnecessarily increasing overall system resource consumption.
Solution Approach 2:
The system changes scheduling parameters such as control channel periodicity, time-frequency resource allocation, and repetition factors based on UE-specific channel conditions and data transmission patterns. By dynamically adjusting these parameters, the system maintains control signaling reliability for vulnerable UEs while optimizing resource efficiency across the overall system.
Data Source
AI summary
Some techniques and apparatuses described herein may be used to avoid or reduce collisions between uplink data communications and uplink control communications for an enhanced machine-type communication user equipment (eMTC UE) operating in an unlicensed radio frequency spectrum band. Furthermore, some techniques and apparatuses may avoid such collision while still allowing efficient use of resources, such as by deferring the uplink data communication within a data segment, rate matching an uplink data communication around uplink control resources (e.g., cell-specific uplink control resources and/or UE-specific uplink control resources), puncturing the uplink data communication to avoid the uplink control resources, multiplexing uplink control information on an uplink data channel, and/or the like.