Enhanced RACH Transmission Timing for Uplink Resource Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In mobile communication systems, the existing RACH transmission procedure is inefficient in managing uplink radio resources, leading to limited reception performance due to interference from unsynchronized uplink signals, which restricts data rate allocation and system throughput.
Innovation Solution
A new RACH transmission procedure is defined, where the UE transmits a preamble followed by an E-DCH and DPCCH, with the DPCCH starting before the E-DCH, and the Node B adjusts scheduling grants based on received ACKs to optimize uplink radio resources, ensuring efficient resource utilization and maintaining target RoT levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the existing RACH transmission procedure is used, then the system structure is simple, but uplink radio resources are inefficiently managed leading to limited reception performance
Solution Approach 1:
The patent segments the RACH transmission procedure into distinct phases: initial preamble transmission, ACK reception, and subsequent E-DCH transmission. This segmentation allows for optimized resource allocation in each phase, improving overall uplink radio resource efficiency while maintaining reliable reception performance through structured transmission stages.
Solution Approach 2:
The patent introduces dynamic resource allocation where the Node B adjusts scheduling grants based on received ACKs. This dynamic adaptation allows the system to optimize uplink radio resources in real-time based on channel conditions and reception performance, resolving the contradiction between resource efficiency and reception reliability.
2Productivity
If unsynchronized uplink signals are transmitted, then device complexity is reduced, but interference increases limiting data rate allocation
Solution Approach 1:
The patent applies preliminary synchronization actions where the Node B provides scheduling grants to UEs before uplink transmission. This preliminary coordination ensures that uplink signals are transmitted in a synchronized manner, reducing interference and enabling higher data rate allocation without increasing device complexity.
Solution Approach 2:
The patent implements a feedback mechanism where the Node B transmits ACKs in response to preamble detection, and uses these ACKs to adjust subsequent scheduling grants. This feedback loop enables dynamic interference management, allowing the system to optimize data rate allocation while maintaining synchronized transmission to minimize harmful interference.
3Measurement precision
If the DPCCH starts before the E-DCH, then channel estimation accuracy is improved, but transmission timing complexity increases
Solution Approach 1:
The patent implements preliminary channel estimation by starting DPCCH transmission before E-DCH data transmission. This preliminary action ensures that the Node B has accurate channel estimates available when receiving E-DCH signals, improving measurement precision without requiring complex real-time adaptation mechanisms.
Solution Approach 2:
The patent manages transmission timing by adjusting the start timing of DPCCH relative to E-DCH as a controllable parameter. This parameter-based approach to timing coordination allows the system to achieve accurate channel estimation while keeping transmission timing complexity manageable through standardized timing relationships defined in the protocol.
Data Source
AI summary
A method for transmitting an enhanced Random Access CHannel (RACH) in a User Equipment (UE) in a mobile communication system is provided, in which the UE transmits an uplink preamble to a Node B and upon receipt of an ACKnowledgment (ACK) for the uplink preamble, transmits an Enhanced Uplink Dedicated CHannel (E-DCH) and a Dedicated Physical Control CHannel (DPCCH) to the Node B. The transmission of the DPCCH starts before the transmission of the E-DCH.