Flexible HARQ Configuration for Carrier Aggregation Efficiency
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Solution Overview
Problem
Current LTE systems have inflexible HARQ process settings, which limit data transmission efficiency due to fixed HARQ process numbers and RTT Timers determined by duplex mode, leading to inefficiencies in carrier aggregation scenarios with different eNBs and varying propagation delays.
Innovation Solution
A terminal and base station system that allows flexible setting of HARQ process numbers, ACK/NACK transmission timing, and HARQ RTT Timers based on received instruction information, enabling dynamic adjustment of error correction processes to optimize data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If HARQ process number and RTT Timer are fixed by duplex mode specification, then system complexity is reduced and ease of operation is improved, but adaptability to different network configurations and propagation delays deteriorates
Solution Approach 1:
The patent makes the HARQ process number and RTT Timer dynamic by allowing the base station to configure these parameters through higher-layer signaling (RRC or MAC CE) rather than fixing them by specification. The terminal adapts these parameters based on network configuration, enabling flexibility for different propagation delays and network scenarios while maintaining standardized operation through configured values.
Solution Approach 2:
The patent changes the HARQ parameters from fixed specification values to configurable parameters. The base station can adjust the HARQ process number and RTT Timer values through RRC signaling or MAC control elements, allowing parameter optimization for different network conditions, carrier aggregation scenarios, and propagation delays without changing the underlying HARQ mechanism.
2Device complexity
If HARQ parameters are fixed by duplex mode, then device complexity is reduced, but data transmission efficiency deteriorates in carrier aggregation scenarios with different eNBs
Solution Approach 1:
The patent introduces dynamic configuration of HARQ parameters through base station control. The terminal receives HARQ process number and RTT Timer configurations via RRC signaling or MAC CE, allowing the system to adapt to carrier aggregation scenarios with different eNBs and propagation delays without increasing terminal device complexity.
Solution Approach 2:
The patent enables the base station to configure HARQ parameters based on network conditions and receive acknowledgments from the terminal. This feedback mechanism allows optimization of data transmission efficiency by adjusting HARQ parameters according to actual propagation delays and network configuration in carrier aggregation scenarios.
3Ease of operation
If HARQ RTT Timer is set to fixed value (8 subframes for FDD), then ease of operation is improved, but loss of time occurs due to inability to adapt to varying propagation delays
Solution Approach 1:
The patent changes the fixed RTT Timer value into a configurable parameter. The base station can adjust the RTT Timer through RRC signaling or MAC CE based on actual propagation delays in different scenarios (e.g., carrier aggregation with different eNBs), reducing time loss while maintaining ease of operation through automated configuration.
Data Source
AI summary
There is provided a terminal for communicating with a base station apparatus, the terminal including a receiver that receives, from the base station apparatus, instruction information for performing an operation of an error correction process to be executed between the base station apparatus and the terminal, the instruction information including at least one of a process number of a process to be used for the error correction process, a time from receiving a signal until transmitting a reception response, and a timer value indicating a time from receiving the signal until receiving a retransmitted signal; and a processor that executes the error correction process based on the instruction information received by the receiver.