PUR Subframe Extended Cyclic Prefix Timing Validation
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing timing advance validation for user equipment (UE) in idle mode, particularly in larger cells and for mobile UEs, leading to potential interference and increased latency due to the need for frequent timing advance adjustments.
Innovation Solution
The implementation of a preconfigured uplink resource (PUR) subframe with an extended cyclic prefix, which allows for reduced timing advance validation processing and increased cell range by accommodating both channel delay spread and UE timing uncertainty, thereby enabling UEs to transmit data without establishing a connection, while omitting unnecessary timing advance validation steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If timing advance validation is performed for PUR subframes, then uplink transmission timing accuracy is improved, but latency increases and processing complexity increases
Solution Approach 1:
The patent extracts and removes the timing advance validation step from the PUR subframe transmission process. By taking out this validation requirement specifically for PUR subframes (while maintaining it for other uplink subframes), the system eliminates the latency and processing overhead associated with validation without compromising overall timing accuracy, since PUR subframes use a dedicated timing advance value configured by the network.
Solution Approach 2:
The patent segments the uplink transmission process into different types of subframes: PUR subframes and non-PUR subframes. Each segment has different timing advance requirements - PUR subframes use a pre-configured timing advance value without validation, while other subframes maintain normal timing advance validation. This segmentation allows optimized processing for PUR subframes while maintaining accuracy for other transmissions.
2Measurement precision
If timing advance validation is performed for PUR subframes, then uplink transmission timing accuracy is improved, but device complexity increases
Solution Approach 1:
The patent removes the timing advance validation mechanism from PUR subframe processing. By extracting this validation requirement, the user equipment's processing complexity is reduced since it no longer needs to perform validation checks for PUR subframes, while the network maintains timing accuracy through proper configuration of timing advance values.
3Productivity
If normal cyclic prefix is used in PUR subframes, then resource efficiency is improved, but interference increases due to timing uncertainty
Solution Approach 1:
The patent changes the cyclic prefix parameter specifically for PUR subframes from normal CP to extended CP. This parameter change increases the timing margin in PUR subframes, allowing the system to accommodate timing uncertainties and prevent interference while still maintaining reasonable resource efficiency through the use of PUR (pre-configured uplink resources).
Data Source
AI summary
According to an example embodiment, a method may include receiving, by a user equipment from a base station associated with a cell, control information assigning a subframe as a preconfigured uplink resource (PUR) subframe for the user equipment, the preconfigured uplink resource (PUR) subframe including an extended cyclic prefix, the control information indicating resources allocated to the user equipment for uplink transmission within the preconfigured uplink resource (PUR) subframe, wherein one or more other subframes for use by the user equipment include a normal cyclic prefix that is shorter in time than the extended cyclic prefix of the preconfigured uplink resource (PUR) subframe; and transmitting, by the user equipment, data via the resources allocated to the user equipment within the preconfigured uplink resource (PUR) subframe.