PUSCH Periodic Feedback Configuration for CSI Transmission
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Solution Overview
Problem
Current LTE systems face challenges in efficiently transmitting increased amounts and sizes of channel state information (CSI) due to evolving air interface features, making periodic and aperiodic reporting inadequate for next-generation systems like 4G.
Innovation Solution
The implementation of a method for periodic information transmission over a shared uplink channel using semi-persistent resource allocation and configuration, allowing user equipment to send feedback information without a specific grant, reducing downlink overhead and enhancing resource management in LTE Advanced systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If periodic reporting is used on PUCCH with maximum size of 11 bits, then feedback transmission is maintained with low overhead, but the amount of CSI that can be transmitted is limited and cannot accommodate increased CSI requirements
Solution Approach 1:
The patent combines periodic feedback transmission with PUSCH resources, merging the control information transmission function with user data transmission resources. This allows CSI to be multiplexed on PUSCH, enabling larger feedback sizes beyond the 11-bit PUCCH limitation while utilizing existing uplink shared channel infrastructure.
Solution Approach 2:
The invention makes PUSCH serve dual purposes: transmitting both user data and periodic CSI feedback. By configuring periodic feedback on PUSCH resources, the system achieves multi-functionality where the shared channel handles both data traffic and control information, accommodating increased CSI requirements without requiring dedicated control channel resources.
2Quantity of substance
If aperiodic reporting on PUSCH is used, then larger feedback size is possible, but transmission can only occur when specifically triggered by an uplink grant, reducing flexibility
Solution Approach 1:
The patent configures periodic feedback transmission in advance through RRC signaling, establishing predetermined resources and timing for CSI reports. This preliminary configuration enables the UE to autonomously transmit periodic feedback without waiting for dynamic grants, combining the flexibility of configured resources with the capability to transmit large amounts of CSI.
Solution Approach 2:
The invention introduces dynamic adaptability by allowing the network to configure multiple periodic feedback configurations with different parameters (periodicity, resources, content). The UE can be dynamically switched between different feedback modes and configurations, providing both the flexibility of periodic transmission and the capability to handle varying CSI requirements.
3Ease of operation
If periodic feedback is multiplexed on user data PUSCH, then transmission occurs when scheduled, but the maximum feedback size remains limited to 11 bits
Solution Approach 1:
The patent fundamentally changes the feedback size parameter by transmitting CSI on PUSCH rather than PUCCH. Since PUSCH supports larger payload sizes compared to the 11-bit PUCCH limitation, this parameter change enables transmission of extended CSI reports with more bits, accommodating increased feedback requirements while maintaining scheduled transmission operations.
Data Source
AI summary
In order to facilitate sending of different kinds of channel feedback information, a periodic information transmission in a shared uplink channel is configured, PUSCH, and required resources are allocated for the transmission.