User Equipment Timer Control for PUR Timing Advance Validity
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Solution Overview
Problem
In wireless communication systems using preconfigured uplink resources (PUR), there is no provision for controlling the timing advance (TA) timer, leading to improper management of timing advance validity, which affects other timers as well.
Innovation Solution
A user equipment and base station apparatus are equipped with transmission, reception, and control units that manage a TA timer through signal reception to ensure appropriate timer control during PUR operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If preconfigured uplink resources (PUR) are used for uplink transmission, then transmission efficiency is improved and resource allocation is simplified, but timer control capability deteriorates and timing advance validity management becomes improper
Solution Approach 1:
The patent extends the existing timer control mechanism, originally designed for granted uplink resources, to also control timers in PUR-based uplink transmission. This allows a single timer control mechanism to handle both transmission types, resolving the contradiction by making the system universal rather than requiring separate mechanisms.
Solution Approach 2:
The patent implements feedback-based timer control where the base station provides timing advance commands and timer control indicators to the user equipment. This feedback mechanism enables proper timer management in PUR transmission by allowing the network to control the timer state based on actual transmission conditions and timing requirements.
2Reliability
If timer control provisions are added to PUR operations, then timing advance validity management is improved, but system complexity increases
Solution Approach 1:
The patent configures timers and timing advance parameters in advance during the PUR setup phase. By pre-configuring the timer values and control mechanisms before actual PUR transmission occurs, the system avoids the need for complex real-time decision-making, thus improving reliability while minimizing the increase in system complexity.
Solution Approach 2:
The user equipment autonomously manages its own timer based on received timing advance commands and pre-configured parameters. The UE independently determines when to restart, stop, or reset timers based on local measurements and received signaling, reducing the need for complex network-side control and thereby limiting the increase in overall system complexity.
Data Source
AI summary
A user equipment including: a transmission unit that transmits a signal to a base station apparatus using a preconfigured uplink resource; a reception unit that receives a signal from the base station apparatus; and a control unit that starts or restarts a predetermined timer in response to receiving the signal from the base station apparatus.