Uplink Control Signaling Multiplexing for LTE-A Multi-Cell Collision
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Solution Overview
Problem
In LTE-A systems, the simultaneous transmission of HARQ-ACKs and P-CSI across multiple serving cells is not supported, leading to potential collisions and suboptimal downlink scheduling and throughput performance, especially with the introduction of CoMP technology increasing CSI-RS resources.
Innovation Solution
The method involves configuring uplink channel resources by a base station to enable the UE to simultaneously transmit P-CSI and HARQ-ACKs of multiple serving cells using PUCCH format 3 or PUSCH, prioritizing serving cells and adjusting bit allocation to manage resource constraints and collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transmits P-CSI and HARQ-ACK separately on different PUCCH resources, then collision between control signals is avoided, but simultaneous transmission of multiple serving cells' control information is not supported
Solution Approach 1:
The patent merges P-CSI and HARQ-ACK transmissions by allowing them to share the same PUCCH format 3 resource. The UE multiplexes control information from multiple serving cells (both P-CSI and HARQ-ACK) into a single PUCCH transmission, eliminating the need for separate resources and enabling simultaneous multi-cell support while avoiding collisions through proper multiplexing
2Productivity
If more uplink channel resources are allocated for simultaneous transmission of P-CSI and HARQ-ACKs across multiple serving cells, then transmission capacity is improved, but resource collision and management complexity increase
Solution Approach 1:
The patent makes PUCCH format 3 a universal resource that can handle multiple types of control information (P-CSI, HARQ-ACK, and their combinations) from multiple serving cells. Instead of allocating dedicated resources for each control signal type, the same PUCCH format 3 resource serves multiple functions, increasing throughput while reducing resource management complexity through standardized multiplexing procedures
3Productivity
If PUCCH format 3 is used for simultaneous transmission of P-CSI and HARQ-ACKs, then transmission efficiency is improved, but resource constraints and bit allocation management become more challenging
Solution Approach 1:
The patent implements dynamic bit allocation within PUCCH format 3 based on the actual transmission needs. The UE dynamically determines how many bits to allocate for P-CSI versus HARQ-ACK from multiple serving cells, adjusting the multiplexing strategy according to the number of serving cells, channel conditions, and priority requirements. This dynamic approach maximizes transmission efficiency while adapting to varying resource constraints without requiring complex static allocation schemes
Data Source
AI summary
Disclosed are a method and an device for processing information. In the method, a UE receives a higher-layer signaling from a base station, wherein the higher-layer signaling carries uplink channel resources configured by the base station for the UE, and the uplink channel resources are used for simultaneously transmitting periodic channel state information P-CSI of a plurality of serving cells corresponding to the UE, or are used for simultaneously transmitting hybrid automatic repeat request acknowledgments HARQ-ACKs of the plurality of serving cells corresponding to the UE and the P-CSI of the plurality of serving cells; and the UE simultaneously transmits the P-CSI of the plurality of serving cells on the uplink channel resources according to the higher-layer signaling in a preset uplink sub-frame, or simultaneously transmits the HARQ-ACKs of the plurality of serving cells and the P-CSI of the plurality of serving cells.