Uplink Control Information Repetition with Dynamic Carrier Selection
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Solution Overview
Problem
Existing 5G NR systems face challenges in efficiently transmitting uplink control information (UCI) due to varying deployment scenarios and requirements, such as ultra-reliable low-latency communications (URLLC) and massive machine type communication (mMTC), where UCI transmission reliability and latency are critical, and current methods like PUCCH carrier switching and repetitions may not optimally combine for enhanced performance.
Innovation Solution
A UE determines a target effective number of transmission repetitions for UCI and selects an appropriate component carrier for each repetition, considering a transmission-effectivity coefficient to optimize UCI transmission, integrating PUCCH carrier switching and repetitions for improved reliability and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PUCCH carrier switching is used to transmit UCI on different component carriers, then transmission reliability is improved, but transmission latency increases due to carrier switching overhead
Solution Approach 1:
The patent implements dynamic carrier selection by introducing a transmission-effectivity coefficient that varies for each component carrier. The UE dynamically determines which carrier to use for each UCI repetition based on real-time channel conditions and the calculated effectiveness coefficients, rather than using fixed carrier switching patterns. This dynamic adaptation optimizes the balance between reliability and latency by selecting the most effective carrier for each transmission opportunity.
Solution Approach 2:
The patent changes the parameter of carrier selection by introducing transmission-effectivity coefficients that quantify the effectiveness of using each component carrier for UCI repetitions. These coefficients are calculated based on channel quality, carrier aggregation configuration, and other transmission parameters. By changing from static carrier switching to parameter-driven dynamic selection, the system achieves both improved reliability and reduced latency.
2Reliability
If multiple transmission repetitions are performed for UCI, then transmission reliability is improved, but transmission latency increases
Solution Approach 1:
The patent applies the skipping principle by allowing the UE to skip certain UCI transmission repetitions when the accumulated effective number of transmissions already meets the target effective number. Instead of performing all configured repetitions, the system rushes through the transmission process by evaluating after each repetition whether the target is achieved, thereby reducing unnecessary latency while maintaining reliability.
Solution Approach 2:
The patent implements feedback mechanisms where the UE continuously monitors the accumulated effective number of UCI transmissions and compares it against the target effective number. This feedback loop enables dynamic termination of the repetition process, allowing the system to achieve the required reliability without performing excessive repetitions that would increase latency.
3Reliability
If transmission repetitions are performed on the same component carrier, then transmission reliability is improved, but frequency diversity is reduced
Solution Approach 1:
The patent applies local quality by assigning different transmission-effectivity coefficients to different component carriers based on their specific channel conditions, frequency characteristics, and aggregation configuration. Each carrier is evaluated locally rather than using a uniform approach, allowing the system to exploit frequency diversity by selecting carriers with favorable local conditions for each UCI repetition.
Solution Approach 2:
The patent transitions from single-carrier transmission to multi-carrier transmission by utilizing the frequency dimension through carrier aggregation. By calculating transmission-effectivity coefficients across multiple component carriers and selecting based on these coefficients, the system adds the frequency dimension to UCI transmission, thereby achieving frequency diversity while maintaining reliability.
Data Source
AI summary
The present disclosure relates to a user equipment, UE, comprising the following. A processing circuitry of the UE determines a target effective number of transmission repetitions for uplink control information, UCI. A transmitter performs one or more transmission repetitions for the available UCI until the target effective number of UCI transmission repetitions is reached. For each transmission repetition, ⋅the processing circuitry determines one component carrier of a plurality of component carriers configured for the UE and determines an uplink resource of the determined component carrier, and ⋅the transmitter transmits the available uplink control information using the determined uplink resource of the determined component carrier. Each performed UCI transmission repetitions contributes with an individual effective number towards the target effective number of UCI transmission repetitions, the effective number of each UCI transmission repetition depends on a transmission-effectivity coefficient relating to the component carrier used for performing the respective UCI transmission repetition.