Terminal Resource Allocation for Simultaneous CBG Ack/Nack
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Solution Overview
Problem
The increase in feedback information bits for Ack/Nack using code block groups (CBGs) in 5G communication systems can lead to increased transmission power, potentially exceeding the terminal's power limit, especially when combined with other information such as scheduling requests.
Innovation Solution
A terminal apparatus and base station apparatus implement a CBG feedback scheme that optimizes the transmission of Ack/Nack information by using resource blocks efficiently, allocating non-use resource blocks to accommodate simultaneous transmission of feedback and scheduling requests, adjusting transmission power based on priority, and utilizing a PUCCH generating unit to manage radio resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If feedback information of Ack/Nack is transmitted using more bits (e.g., CBG-based feedback), then measurement precision and reliability are improved, but transmission power increases
Solution Approach 1:
The feedback information is segmented into multiple priority levels (first priority for Ack/Nack, second priority for other information). The terminal divides the available transmission resources and power allocation accordingly, ensuring that critical Ack/Nack feedback receives sufficient power while other information can be transmitted using remaining resources.
Solution Approach 2:
Different quality levels are applied to different parts of the transmitted information. First priority information (Ack/Nack) is transmitted with higher power and more reliable modulation, while second priority information uses lower power. This local differentiation of quality allows the system to maintain high reliability for critical feedback while managing overall power consumption.
2Productivity
If multiple types of information are simultaneously transmitted, then productivity and communication efficiency are improved, but transmission power increases
Solution Approach 1:
The terminal dynamically adjusts transmission parameters based on the combination and priority of information to be transmitted. When multiple information types are present, the system dynamically allocates power and resources, adjusting modulation and coding schemes for different information types to optimize the balance between communication efficiency and power consumption.
Solution Approach 2:
The system changes transmission parameters (power allocation, modulation order, coding rate) based on the priority classification of information. First priority information uses parameters optimized for reliability, while second priority information uses parameters that consume less power, allowing efficient simultaneous transmission within power constraints.
3Reliability
If transmission power is increased to accommodate more feedback bits, then reliability is improved, but the terminal exceeds its power limit
Solution Approach 1:
Instead of uniformly increasing power for all transmissions, the terminal applies different power levels to different information types. Critical Ack/Nack feedback receives higher power to ensure reliability, while other information receives lower power, allowing the total power to remain within limits while maintaining reliable transmission of essential feedback.
Solution Approach 2:
The system uses priority-based feedback mechanisms where the terminal first ensures reliable transmission of high-priority Ack/Nack information, then uses remaining power for lower-priority information. This feedback-driven power allocation ensures reliability for critical communications while preventing power limit violations.
Data Source
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AI summary
A terminal apparatus includes a reception unit that receives radio signals from a base station apparatus; a response signal generating unit that generates reception responses for notifying of a plurality of reception results of the radio signals received by the reception unit; and a transmission unit that changes sizes or positions of radio resources to be used for transmitting signals between a case where a plurality of different kinds of signals including the reception responses is transmitted at the same timing and a case where one kind of signals are transmitted.