HARQ RTT Timer Configuration for PDCCH Scheduling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increasing number of user equipment (UEs) requiring service from a base station (BS) and the growing amount of data and control information to be transmitted pose challenges in efficiently using limited radio resources, necessitating a method to reduce latency and improve data transmission efficiency, especially for new radio access technologies.
Innovation Solution
A method for user equipment (UE) to receive downlink signals by controlling a hybrid automatic repeat request (HARQ) round trip timer (RTT) timer set to specific values associated with radio network temporary identifiers (RNTIs), allowing for efficient data transmission and retransmissions, and implementing logical channel prioritization based on varying time intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of user equipment (UEs) and data transmission amount increase, then service capacity and communication demand are improved, but radio resource efficiency and system complexity deteriorate
Solution Approach 1:
The patent segments the HARQ RTT timer into multiple values (first value and second value) based on different RNTI types. Common RNTIs (SI-RNTI, P-RNTI, RA-RNTI) use a first timer value, while other RNTIs use a second timer value. This segmentation allows the system to handle different types of transmissions with appropriate timing without increasing overall system complexity.
Solution Approach 2:
The patent changes the HARQ RTT timer parameter based on the RNTI type associated with the PDCCH. By setting the timer to different values (first value or second value) depending on the RNTI, the system adapts the timing parameters to match the specific transmission requirements, improving resource efficiency while managing complexity.
2Loss of time
If traditional HARQ RTT timer values are used, then system compatibility is maintained, but latency is increased
Solution Approach 1:
The patent applies different HARQ RTT timer values to different RNTI types rather than using a uniform timer value. This local differentiation allows optimized timing for specific transmission types (reducing latency for certain UEs) while maintaining standard timing for others, thus preserving system compatibility through selective optimization.
Solution Approach 2:
The patent introduces dynamic adjustment of the HARQ RTT timer value based on the RNTI type. The timer is not fixed but adapts its value according to the specific transmission context, allowing the system to reduce latency when appropriate while maintaining compatibility through standardized behavior for common RNTIs.
Data Source
AI summary
A user equipment (UE) receives a physical downlink control channel (PDCCH) scheduling a data transmission, and starts a hybrid automatic repeat request (HARQ) round trip timer (RTT) timer for the data transmission. The HARQ RTT timer is set to a non-negative value associated with a radio network temporary identifier (RNTI) addressing the PDCCH.