Terminal Device PUCCH Resource Selection for Multi-Cell Scheduling Requests
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Solution Overview
Problem
The existing methods for transmitting a scheduling request from a terminal device to a base station in a multi-cell LTE environment, particularly when the physical uplink control channel is transmitted in a secondary cell, are not sufficiently efficient.
Innovation Solution
A terminal device and communication method that selectively use physical uplink control channel resources across multiple serving cells, including primary and secondary cells, to efficiently manage scheduling requests and uplink control information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a physical uplink control channel is transmitted in a secondary cell (serving cell other than primary cell), then the terminal device can efficiently use multiple cells for communication, but the method for transmitting scheduling request is not sufficiently considered leading to communication inefficiency
Solution Approach 1:
The patent implements dynamic selection of uplink control channel transmission cells based on real-time conditions. The terminal device determines whether to transmit in the primary cell or secondary cell based on whether the secondary cell is configured for PUCCH transmission and whether uplink shared channel resources are available, allowing adaptive optimization of communication efficiency and reliability
Solution Approach 2:
The patent segments the uplink control channel transmission function across multiple serving cells. By dividing the transmission functionality between primary and secondary cells based on configuration and resource availability, the system achieves both efficient multi-cell utilization and reliable scheduling request transmission
2Reliability
If uplink control channel and uplink shared channel are not simultaneously transmitted on the same uplink subframe, then resource conflicts are avoided, but resource sharing between cells becomes complex
Solution Approach 1:
The patent applies preliminary action by receiving control information in advance that configures the non-simultaneous transmission of uplink control channel and uplink shared channel. This pre-configuration prevents resource conflicts before they occur and simplifies the resource sharing management between cells by establishing clear transmission rules beforehand
Data Source
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AI summary
A terminal device and a base station device efficiently communicate with each other by using multiple cells. The terminal device selects a PUCCH resource used to transmit an SR, from a first PUCCH resource in a first cell and a second PUCCH resource in a second cell, and transmits the SR by using the selected PUCCH resource in a first subframe. In a case that a first PUSCH not including a transport block in the first subframe is transmitted in the first cell, the second PUCCH resource in the first subframe is selected.