Uplink Data Transmission via Preconfigured Resources with Timing Advance Validation
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Solution Overview
Problem
Current mobile communication systems face challenges in managing explosive data traffic, high data rates, a large number of connected devices, low latency, and energy efficiency, particularly in transmitting uplink data effectively through preconfigured resources.
Innovation Solution
A method and apparatus for transmitting uplink data through a preconfigured uplink resource, involving timing advance (TA) updates and validation, where the user equipment (UE) receives configuration information, transitions states, performs TA updates based on validity, and transmits data on specific resources while managing resource allocation and counter values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE transmits uplink data through preconfigured uplink resources in RRC idle state, then resource utilization efficiency is improved, but timing advance validity becomes uncertain leading to potential transmission errors
Solution Approach 1:
The base station pre-configures uplink resources and timing advance values for the UE before the UE transitions to RRC idle state. This preliminary configuration enables the UE to perform uplink transmissions without needing to maintain continuous RRC connection, thus improving resource utilization while ensuring timing advance validity through advance preparation
Solution Approach 2:
The UE monitors the validity of its timing advance value while in RRC idle state by detecting downlink reference signals. When the timing advance is determined to be invalid, the UE initiates a random access procedure to obtain an updated timing advance value from the base station, ensuring transmission reliability before sending uplink data
2Measurement precision
If the UE performs timing advance update procedure, then transmission timing accuracy is improved, but uplink data transmission delay increases
Solution Approach 1:
The UE autonomously determines whether its current timing advance value is valid by self-evaluating against downlink reference signals. This self-service mechanism eliminates the need for the base station to continuously monitor and command timing advance updates, reducing signaling overhead and transmission delay while maintaining timing accuracy
Solution Approach 2:
The UE performs timing advance validation and update only when necessary - specifically when transitioning from RRC connected to idle state or when timing advance validity is in doubt. This partial action approach avoids unnecessary timing advance procedures that would increase delay, while still ensuring timing accuracy when required
Data Source
AI summary
The present disclosure is related to a method, by a user equipment (UE), for transmitting uplink data through a preconfigured uplink resource (PUR) in a wireless communication system and apparatus therefor. According to the present disclosure, the method comprises, the UE receives, from a base station, PUR configuration information for uplink data transmission based on the PUR in a radio resource control (RRC) connected state; transitions from the RRC connected state to an RRC idle state; performing a timing advance (TA) update procedure based on whether a TA related to uplink transmission timing is valid; and transmits, to the base station, the uplink data on a first resource of the PUR, wherein, based on that a specific resource included in the PUR is included in a TA update performing interval, a transmission for the uplink data on the specific resource is dropped, and a value of a counter for release of the PUR is held regardless of dropping of the uplink data on the specific resource.