PUCCH Transmission Switching in Carrier Aggregation
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Solution Overview
Problem
In LTE-Advanced networks, the existing technology faces challenges in efficiently transmitting the physical uplink control channel (PUCCH) when uplink and downlink configurations of aggregated component carriers are not the same, leading to subframes with both uplink and downlink component carriers, which hinders spectral efficiency and increases feedback time delay.
Innovation Solution
A method is introduced where User Equipment (UE) dynamically switches the transmission of the PUCCH between the primary and secondary component carriers based on network signaling, ensuring that PUCCH is transmitted in the primary carrier when possible, and in the secondary carrier when necessary, to optimize resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If PUCCH transmission is restricted to primary uplink component carrier only, then system complexity is reduced and compatibility is improved, but feedback time delay increases and spectral efficiency deteriorates
Solution Approach 1:
The patent implements dynamic PUCCH transmission by enabling the UE to switch between primary and secondary component carriers based on real-time uplink-downlink configuration. The UE determines the appropriate component carrier for PUCCH transmission in each subframe according to the TDD configuration, transforming the static transmission restriction into a dynamic selection mechanism that adapts to varying network conditions.
Solution Approach 2:
The patent changes the transmission parameter (component carrier selection) based on the uplink-downlink configuration. When the primary uplink component carrier is unavailable due to TDD configuration constraints, the UE switches to transmit PUCCH on the secondary component carrier, effectively changing the transmission parameter to maintain timely feedback while respecting the configured uplink-downlink pattern.
2Device complexity
If PUCCH transmission is restricted to primary uplink component carrier only, then carrier aggregation configuration is simplified, but spectral efficiency deteriorates and uplink resource utilization decreases
Solution Approach 1:
The patent introduces dynamic component carrier selection for PUCCH transmission based on TDD configuration. The UE dynamically determines whether to use the primary or secondary component carrier for control channel transmission in each subframe, enabling flexible adaptation to different uplink-downlink configurations and improving spectral efficiency without significantly complicating the carrier aggregation framework.
Solution Approach 2:
The patent enables the secondary component carrier to serve dual purposes: data transmission on PDSCH/PUSCH and control channel transmission on PUCCH. This multi-functionality allows the secondary carrier to be utilized for PUCCH when the primary carrier is configured for downlink, thereby improving overall spectral efficiency and resource utilization across the aggregated carriers.
3Productivity
If PUCCH transmission switches between primary and secondary component carriers, then feedback time delay is reduced and spectral efficiency is improved, but device complexity and transmission control difficulty increase
Solution Approach 1:
The patent implements self-service transmission control by enabling the UE to autonomously determine the appropriate component carrier for PUCCH transmission based on the received TDD configuration. The UE independently evaluates the uplink-downlink configuration and selects the suitable component carrier without requiring additional network control signaling, thereby reducing transmission control complexity while achieving flexible PUCCH transmission.
Solution Approach 2:
The patent utilizes the TDD configuration as feedback information to guide PUCCH transmission decisions. The UE receives the uplink-downlink configuration from the network and uses this feedback to determine the appropriate component carrier for control channel transmission, creating a closed-loop control mechanism that optimizes spectral efficiency based on network conditions.
Data Source
AI summary
The present invention provides a method and user equipment for transmitting a physical uplink control channel. The method includes: in a carrier aggregation scenario, based on a predetermined rule, the transmission of the Physical Uplink Control Channel (PUCCH) is switched between a secondary component carrier and a primary component carrier, or the transmission of the PUCCH is only in the primary component carrier, which is selected by the user equipment (UE); and the UE transmitting the PUCCH in the selected component carrier. The present invention reduces the feedback time delay of uplink control information, and improves the utilization of uplink resources.