Uplink Control Information Multiplexing for Primary Cell Load Reduction
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Solution Overview
Problem
Current multicarrier communication systems face challenges in efficiently managing uplink control information and control channel monitoring, particularly in scenarios involving carrier aggregation and dual connectivity, where the load on primary cells can become excessive due to the accumulation of PUCCH transmissions.
Innovation Solution
The implementation of advanced multicarrier communication techniques, including the use of orthogonal frequency division multiplexing (OFDM) and dynamic modulation and coding schemes, allows for the distribution of uplink control information across multiple carriers and cells, thereby offloading the load from primary cells to secondary cells and optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink control information is transmitted on primary cells using PUCCH, then control information delivery is reliable, but the load on primary cells becomes excessive
Solution Approach 1:
The patent segments the control information transmission by dividing it into two paths: critical control information (ACK/NACK) continues to be transmitted on the primary cell via PUCCH to ensure reliability, while less critical control information (CSI, SR) is offloaded to secondary cells via PUSCH. This segmentation resolves the contradiction by maintaining reliable delivery of essential control signals while reducing the primary cell's overall load.
Solution Approach 2:
The patent extracts and separates certain control information types (specifically CSI and SR) from the primary cell's PUCCH transmission burden and relocates them to secondary cells for transmission via PUSCH. This extraction principle directly addresses the contradiction by removing non-critical control information from the primary cell, thereby reducing its load while maintaining overall control information delivery reliability.
2Reliability
If control channel monitoring is performed on multiple carriers, then control information coverage is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by differentiating the monitoring requirements for different cells: primary cells maintain full PDCCH monitoring for critical control information, while secondary cells use reduced monitoring strategies focused only on PUSCH-based control information. This localized differentiation improves overall control information coverage across multiple carriers while reducing the device's overall monitoring complexity by optimizing each cell's monitoring requirements according to its specific role.
3Device complexity
If PUCCH transmissions are concentrated on primary cells, then control information delivery is simplified, but network capacity is reduced
Solution Approach 1:
The patent merges control information transmission resources by utilizing both primary and secondary cells for different types of control information. Instead of concentrating all PUCCH transmissions on primary cells, the system combines PUCCH on primary cells with PUSCH-based control information transmission on secondary cells, thereby distributing the control information load across multiple cells and increasing overall network capacity while maintaining manageable complexity through standardized transmission procedures.
Data Source
AI summary
A wireless device receives message(s) comprising configuration parameters of one or more logical channels. A multiplexing process is selected for transmitting uplink control information via an uplink channel employed for transmission of a transport block. The transport block comprises data of the one or more logical channels. The selecting is based on the configuration parameters of the one or more logical channels. The uplink control information is multiplexed in the uplink channel employing the multiplexing process. The transport block and the uplink control information are transmitted via the uplink channel.