DRX Uplink Synchronization via Dedicated Preamble
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Solution Overview
Problem
Current Discontinuous Reception (DRX) methods in mobile communication systems are inefficient in minimizing power consumption and maintaining uplink synchronization for connected mode User Equipment (UE), leading to unnecessary channel quality reporting and potential uplink synchronization loss.
Innovation Solution
The solution involves a UE that receives an incoming data indication to establish uplink synchronization and report channel quality only when data is available, optimizing DRX operations by matching synchronization before data reception and reporting channel quality efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the connected mode UE performs periodic channel quality reporting and uplink synchronization maintenance during DRX operation, then uplink synchronization is maintained, but power consumption increases
Solution Approach 1:
The patent implements selective periodic action by having the UE perform channel quality reporting and synchronization maintenance only at specific intervals when data is actually received during DRX operation, rather than continuously or at fixed periodic intervals. This resolves the contradiction by maintaining synchronization reliability only when necessary while reducing unnecessary power consumption during idle DRX periods.
Solution Approach 2:
The UE autonomously determines whether to perform channel quality reporting and synchronization maintenance based on its own DRX state and data reception status. The device self-manages its synchronization and reporting activities without requiring external triggering, enabling it to skip unnecessary operations during extended DRX intervals while maintaining synchronization when data is actually received.
2Speed
If the UE wakes up frequently to check for data during DRX operation, then data reception及时性 is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic wake-up behavior where the UE adjusts its wake-up frequency and DRX cycle length based on data reception patterns and service requirements. The device can extend DRX intervals when no data is expected while maintaining shorter intervals when data arrival is anticipated, dynamically optimizing the balance between reception timeliness and power consumption.
Solution Approach 2:
The UE changes its operational parameters including DRX cycle length, wake-up timing, and monitoring behavior based on channel conditions, data reception status, and service type. This allows the device to adapt its power consumption and responsiveness characteristics to match actual network conditions and data arrival patterns.
3Loss of information
If the UE performs channel quality reporting after every wake-up, then channel quality information is continuously updated, but unnecessary reporting increases power consumption
Solution Approach 1:
The patent implements preliminary assessment where the UE first checks for the presence of data or specific triggering conditions before performing channel quality reporting. This preliminary action prevents unnecessary reporting operations while ensuring that channel quality information is captured when actually needed for data reception or network optimization.
Solution Approach 2:
The patent extracts the channel quality reporting function from continuous operation and separates it into conditional execution based on specific triggers such as data reception, network requests, or channel condition changes. This extraction allows the UE to maintain accurate channel quality information when necessary while eliminating wasteful reporting during idle periods.
Data Source
AI summary
Methods and apparatuses are provided for establishing time alignment by a User Equipment (UE) in a wireless communication system. Information for identifying a dedicated preamble on a downlink control channel is received from a base station. The dedicated preamble is transmitted to the base station based on the information. A response message to the transmitted dedicated preamble is received from the base station on a downlink shared channel. The response message includes a timing adjustment information and information for a Channel Quality Indicator (CQI) report. Time alignment is established based on the timing adjustment information included in the response message. The CQI report based on the information for CQI report is transmitted to the base station.