EUL Access Delay Reduction via Separate Transmission Control Parameters
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Solution Overview
Problem
The existing wireless communication systems, such as HSPA, face sub-optimal performance in the Enhanced Uplink in CELL_FACH state procedure due to delays in accessing EUL resources, which are similar to those in the RACH procedure, leading to inefficient resource utilization and increased power consumption.
Innovation Solution
The implementation of specific transmission control parameters for the Enhanced Uplink in CELL_FACH state procedure, distinct from those used in the RACH procedure, to control the timing of entering and re-entering the transmission procedure, including separate persistence value and back-off time parameters, optimizing the access to EUL resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the UE uses the same transmission control parameters for both RACH procedure and Enhanced Uplink in CELL_FACH state, then the system maintains simplicity in parameter management, but the delay for accessing EUL resources increases and becomes sub-optimal
Solution Approach 1:
The patent segments the transmission control parameters into two distinct sets: one set for RACH procedure and another set for Enhanced Uplink in CELL_FACH state. This segmentation allows each procedure to have optimized parameters specific to its requirements, thereby reducing access delay for EUL resources while maintaining manageable complexity through clear separation of parameters.
Solution Approach 2:
The patent introduces dynamic parameter selection based on the transmission procedure type. The UE dynamically switches between different sets of transmission control parameters depending on whether it is performing RACH or Enhanced Uplink in CELL_FACH state, allowing optimal performance for each procedure without being constrained by a single fixed parameter set.
2Speed
If the UE enters CELL_DCH state for rapid data transmission, then transmission speed improves, but power consumption increases significantly
Solution Approach 1:
The patent changes the operational parameters by introducing separate transmission control parameters for Enhanced Uplink in CELL_FACH state, enabling faster access to EUL resources without requiring transition to CELL_DCH state. This parameter optimization allows the UE to achieve rapid data transmission while remaining in the lower-power CELL_FACH state, thereby reducing overall power consumption.
3Reliability
If the network maintains connection in uplink and downlink to enable rapid transmission, then transmission readiness improves, but uplink interference from control data transmission increases even without data activity
Solution Approach 1:
The patent prepares the UE by configuring separate transmission control parameters for Enhanced Uplink in CELL_FACH state in advance. This preliminary configuration enables the UE to quickly access EUL resources when needed without requiring continuous connection maintenance, thereby reducing uplink interference from control data transmission while maintaining transmission readiness through optimized parameter availability.
Data Source
AI summary
The present invention relates to methods and arrangements that make it possible to control the delay for the UEs to access the EUL resources in the Enhanced Uplink in CELL_FACH state procedure, independently from the delay for the UEs to access ordinary UL resources in the RACH procedure. This is achieved by a solution where the timing of entering (or re-entering) a transmission procedure for Enhanced Uplink in CELL_FACH state is controlled with the help of a transmission control parameter defined specifically for this transmission procedure, instead of using the same parameter as for the RACH procedure.