EUL Transport Format Selection via Buffer Status
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Solution Overview
Problem
Current Discontinuous Reception (DRX) and Discontinuous Transmission (DTX) methods in cellular radio systems, particularly with 10 ms Transmission Time Intervals (TTIs), face inefficiencies due to long HARQ Round Trip Time and delays, leading to misaligned transmission timing and restricted DRX cycles, with no effective means to limit unnecessary transmissions.
Innovation Solution
A method for selecting transport formats in User Equipment (UE) based on buffer status, where transmissions are stopped if the buffer will be emptied, and the maximum number of consecutive transmissions is limited, allowing for more efficient resource use and flexible buffer handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If DRX cycles are used with 10 ms TTI to enable discontinuous transmission and reception, then power saving and interference reduction are achieved, but transmission timing becomes misaligned and DRX cycles are heavily restricted due to long HARQ RTT and delays
Solution Approach 1:
The patent introduces dynamic adjustment of the inactivity threshold parameter to adapt to different traffic conditions and TTI configurations. The threshold is no longer fixed but can be modified based on current buffer status and transmission patterns, allowing the system to dynamically balance between power saving and transmission timing requirements.
Solution Approach 2:
The patent changes the key parameter from a fixed inactivity threshold to a dynamically adjustable one that considers buffer status. By monitoring whether the buffer will be emptied in the next transmission, the system adjusts transmission behavior to maintain proper timing alignment while preserving DRX power-saving benefits.
2Object-generated harmful factors
If the inactivity threshold is used to limit transmissions, then unnecessary transmissions are restricted, but no effective means exist to limit transmissions when the buffer will be emptied, leading to inefficient resource use
Solution Approach 1:
The patent implements a feedback mechanism where the UE monitors its buffer status and provides this information to the network. The network uses this feedback to determine whether to allow or restrict transmissions, creating a closed-loop control system that efficiently manages resource usage based on actual buffer conditions rather than fixed thresholds.
Solution Approach 2:
The patent enables preliminary action by allowing the network to pre-configure the inactivity threshold and transmission parameters based on expected traffic patterns. The UE then follows these pre-established rules, making transmission decisions in advance rather than reacting to fixed thresholds, which improves overall resource utilization efficiency.
Data Source
AI summary
In a method and a device for selecting transport format in a User Equipment transmitting data in a cellular radio system using an Enhanced Uplink (EUL) with Discontinuous Reception (DRX) the determination of whether or not to transmit data in the next Transmission Time Interval (TTI) is based on the amount of data in the User Equipment transmission buffer.