PUCCH Resource Allocation for Simultaneous SR and ACK/NACK
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Solution Overview
Problem
In LTE-A systems, the simultaneous transmission of scheduling requests (SR) and response signals (ACK/NACK) leads to an increase in the overhead of the uplink control channel (PUCCH) due to the need for multiple SR and ACK/NACK resources, especially when channel selection is applied for response signal transmission.
Innovation Solution
A terminal apparatus and retransmission control method that optimize the transmission of response signals by using a transmission rule that associates different resource and phase point pairs with error detection result patterns, reducing the number of required SR and ACK/NACK resources even when channel selection is applied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple SR and ACK/NACK resources are allocated for simultaneous transmission, then the reliability of control signal transmission is improved, but the overhead of the uplink control channel increases
Solution Approach 1:
The patent combines SR and ACK/NACK transmissions into a single PUCCH resource when simultaneous transmission is required. The base station allocates one PUCCH resource that can carry both scheduling request and acknowledgment/negative acknowledgment signals, thereby reducing the number of separate resources needed while maintaining transmission reliability.
Solution Approach 2:
The PUCCH resource is designed to serve multiple functions: it can transmit SR alone, ACK/NACK alone, or both SR and ACK/NACK simultaneously. This multi-functional design allows the same resource to handle different transmission scenarios, reducing overall overhead while ensuring reliable control signal delivery in all cases.
2Productivity
If channel selection is applied for response signal transmission, then the transmission efficiency is improved, but the number of required resources increases
Solution Approach 1:
The patent merges the resource allocation for channel selection with the SR resource allocation. Instead of allocating separate resources for channel selection-based ACK/NACK transmission, the system uses the same PUCCH resource that would be used for SR transmission, thereby maintaining high transmission efficiency while reducing the total number of required resources.
Solution Approach 2:
The PUCCH resource is designed to support multiple transmission modes including channel selection for ACK/NACK, SR transmission, and simultaneous SR+ACK/NACK transmission. This universal resource design eliminates the need for separate dedicated resources for each mode, reducing overall resource consumption while preserving transmission efficiency.
Data Source
AI summary
Provided are a terminal device and a retransmission control method that make it possible to minimize increases in overhead in an uplink control channel (PUCCH), even if channel selection is used as the method to transmit response signals during carrier-aggregation communication using a plurality of downlink unit bands. On the basis of the generation status of uplink data and error-detection results obtained by a CRC unit, a control unit in the provided terminal uses response signal transmission rules to control the transmission of response signals or uplink control signals that indicate the generation of uplink data. If an uplink control signal and a response signal are generated simultaneously within the same transmission time unit, the control unit changes the resources allocated to the response signal and/or the phase point of the response signal in accordance with the number and position of ACKs within the error-detection result pattern.