Terminal Response Signal Sequence Multiplication for Carrier Aggregation
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Solution Overview
Problem
The challenge arises when a base station changes the configuration of carrier aggregation for a terminal using higher layer signaling, leading to a period where there is a difference in recognition between the base station and the terminal regarding the number of downlink component carriers, resulting in disrupted uplink response signal transmission.
Innovation Solution
A terminal apparatus and method that generate and transmit response signals using specific sequence multiplication techniques, where one response signal is multiplied by a first sequence in secondary communication and two response signals are multiplied by second and third sequences in primary communication, ensuring successful transmission even during recognition differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the base station changes the configuration of carrier aggregation using higher layer signaling, then the communication capacity and flexibility are improved, but a recognition difference period occurs between base station and terminal regarding the number of downlink component carriers
Solution Approach 1:
The terminal dynamically adapts its response signal transmission mode based on the detected downlink component carrier configuration. When carrier aggregation is configured, the terminal transmits separate response signals for each component carrier; when not configured, the terminal transmits a single response signal. This dynamic adaptation resolves the contradiction by allowing the system to flexibly change configuration while maintaining reliable response signal transmission throughout the transition period.
Solution Approach 2:
The terminal changes the parameters of response signal transmission (number of response signals, resource allocation, sequence multiplication factors) based on the detected carrier aggregation configuration state. By monitoring whether the number of downlink component carriers is 1 or greater than 1, the terminal adjusts transmission parameters accordingly, ensuring reliable communication during configuration transitions caused by higher layer signaling changes.
2Measurement precision
If separate response signals are transmitted for each component carrier, then the communication accuracy is improved, but the uplink control channel resource consumption increases
Solution Approach 1:
The terminal applies different response signal transmission strategies to different component carriers based on local conditions. For each component carrier, the terminal determines whether to transmit a separate response signal or combine it with others, optimizing the balance between accuracy and resource consumption for each specific carrier rather than applying a uniform approach across all carriers.
Solution Approach 2:
The same uplink control channel resources are used for transmitting response signals regardless of whether carrier aggregation is configured or not. The terminal universally uses the PUCCH format and resource allocation mechanisms defined in the specification, adapting the number and content of response signals based on the configuration state, thereby achieving multi-functionality with a single resource framework.
3Reliability
If the terminal monitors multiple component carriers for allocation control information, then the data reception reliability is improved, but the terminal processing complexity increases
Solution Approach 1:
The terminal segments the monitoring and processing tasks by component carrier. When carrier aggregation is configured, the terminal separately monitors allocation control information on each downlink component carrier and generates corresponding response signals for each carrier. This segmentation allows reliable multi-carrier reception while organizing processing in a structured, manageable way that reduces overall complexity through modular handling.
Solution Approach 2:
The terminal performs preliminary detection of the carrier aggregation configuration state before initiating response signal transmission. By first determining whether the number of downlink component carriers is 1 or greater than 1, the terminal prepares the appropriate transmission mode in advance, avoiding complex real-time decision-making during the actual response signal generation and reducing processing complexity through proactive configuration awareness.
Data Source
AI summary
This invention is related to a terminal apparatus that can normally transmit an upstream response signal. A response signal generating unit (212); generates response signals on the basis of a setting rule in which pattern candidates of success or failure in the reception of downstream allocation control information and downstream data are associated with the phase points of response signals and further in which the phase point of one response signal associated with an arbitrary pattern of success or failure in the reception during the second communication has been set to be identical with the phase points of two response signals associated with pattern candidates for which the pattern of success or failure in the reception at PCC during the first communication is identical with the arbitrary pattern and for which all of the receptions of downstream allocation control information have been failed at SCC.