UCI Transmission Selection in LTE-A Carrier Aggregation
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Solution Overview
Problem
In LTE-A carrier aggregation systems, there is no specific solution for determining which Physical Uplink Shared Channel (PUSCH) to use for transmitting Uplink Control Information (UCI) when multiple PUSCH transmissions are available in a single uplink subframe.
Innovation Solution
A method and equipment for UCI transmission in LTE-A systems, where user equipment selects an uplink component carrier based on predefined selection rules or carrier selection indication information from the eNB and transmits UCI through the selected PUSCH, while also determining whether to transmit uplink data through other available PUSCHs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple PUSCH transmissions are scheduled for a UE in one uplink subframe, then the UE can transmit uplink data through multiple carriers simultaneously, but it is unclear which PUSCH should be used for transmitting UCI
Solution Approach 1:
The patent applies parameter changes by introducing carrier selection indication information as a scheduling parameter to dynamically determine which PUSCH carries UCI. The eNB configures and indicates the selected carrier through downlink signaling, changing the transmission parameter (UCI carrier location) based on system scheduling needs, thus resolving the ambiguity of UCI transmission path while maintaining multiple PUSCH capability.
Solution Approach 2:
The patent uses carrier selection indication information as an intermediary mechanism. This indication information acts as a mediator between the eNB's scheduling decision and the UE's transmission action, clearly specifying which PUSCH should carry UCI without requiring complex UE-side decision logic, thus simplifying the operation while supporting multiple PUSCH transmissions.
2Device complexity
If UCI is transmitted on PUSCH with multiplexing, then resource utilization is improved, but the determination of which PUSCH to use becomes complex when multiple PUSCH are available
Solution Approach 1:
The patent extracts the carrier selection decision from the UE and centralizes it at the eNB side. The eNB determines and indicates the selected PUSCH through carrier selection indication information, separating the complex selection logic from the UE implementation. This reduces device complexity at the UE while maintaining clear operational guidance for PUSCH selection.
Solution Approach 2:
The patent enables the eNB to self-determine the optimal PUSCH for UCI transmission based on its global scheduling knowledge, and then communicates this decision to the UE. The system serves itself by having the scheduler (eNB) make the determination rather than requiring the executed entity (UE) to independently decide, simplifying the overall system operation.
Data Source
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AI summary
The present invention discloses a method and equipment for UCI transmission. Upon application of the technical solution provided in embodiments of the present invention, UE transmitting UCI through a selected PUSCH is realized when multiple PUSCH transmissions are available for a UE in one uplink subframe in LTE-A carrier aggregation system, which solves the problem on how to transmit UCI only through one PUSCH when multiple PUSCH transmissions are available.