Terminal Device PUCCH Resource Selection for Carrier Aggregation
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Solution Overview
Problem
The existing LTE communication systems lack an efficient method for transmitting scheduling requests from a terminal device to a base station when the physical uplink control channel is transmitted in a secondary cell, which is different from the primary cell.
Innovation Solution
A terminal device is designed to select and transmit scheduling requests using physical uplink control channel resources from both the primary and secondary serving cells, employing specific formats and multiplexing techniques based on HARQ-ACK transmissions in each cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a terminal device transmits scheduling requests using multiple serving cells (beyond the standard five cells), then the communication efficiency and resource utilization are improved, but the complexity of managing physical uplink control channel resources increases
Solution Approach 1:
The patent divides the physical uplink control channel resources into separate first and second resources corresponding to different serving cells. The terminal device independently manages PUCCH resources for each cell group, selecting from the first PUCCH resource for the first serving cell and the second PUCCH resource for the second serving cell, thereby simplifying the management of resources across multiple cells
Solution Approach 2:
The patent enables the terminal device to use a unified scheduling request transmission mechanism that works across multiple serving cells (up to five cells). The same PUCCH format 1 and selection process can be applied regardless of which cell is used, making the system versatile for carrier aggregation scenarios beyond the traditional five-cell limit
2Reliability
If a terminal device selects physical uplink control channel resources from multiple serving cells for scheduling request transmission, then the reliability of scheduling request delivery is improved, but the difficulty of resource selection and coordination increases
Solution Approach 1:
The patent segments PUCCH resources into cell-specific first and second resources. The terminal device independently selects from the first PUCCH resource for the first serving cell and the second PUCCH resource for the second serving cell based on simple comparison rules, reducing the difficulty of resource selection while maintaining reliability across multiple cells
Solution Approach 2:
The base station device pre-configures the first and second PUCCH resources for the terminal device before the terminal device needs to transmit scheduling requests. This preliminary configuration allows the terminal device to simply select from pre-defined options rather than performing complex real-time resource allocation, reducing selection difficulty while ensuring reliable delivery
Data Source
AI summary
A terminal device and a base station device efficiently communicate with each other by using multiple cells. The terminal device selects a physical uplink control channel resource used to transmit an SR from a first resource on a first cell for a first subframe and a second resource on a second cell for the first subframe. In a case that neither transmission of a first HARQ-ACK using a given PUCCH format in the first cell nor transmission of second HARQ-ACK using a given PUCCH format in the second cell takes place in the first subframe, the SR is multiplexed with each of the first HARQ-ACK transmitted by using the given PUCCH format in the first subframe on the first cell and the second HARQ-ACK transmitted by using the given PUCCH format in the first subframe on the second cell.