Idle-Mode Small Data Transmission With Cell Reselection
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in handling small data transmissions by wireless transmit/receive units (WTRUs) in idle or inactive modes without transitioning to connected mode, leading to suboptimal resource utilization and increased power consumption.
Innovation Solution
A processor in the WTRU is configured to perform uplink and/or downlink small data transmissions in idle or inactive mode by monitoring for downlink transmissions within a specified search space and restarting a time period for further transmissions, while suspending data radio bearers and performing cell reselection and random access procedures as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If WTRU transitions to connected mode for small data transmission, then transmission reliability is improved, but power consumption increases and resource utilization deteriorates
Solution Approach 1:
The patent segments the data transmission process by identifying small data transmissions as a distinct category that can be handled differently from regular data. This segmentation allows WTRUs to remain in idle or inactive modes for small data transmissions while maintaining connected mode for larger transmissions, thereby reducing unnecessary mode transitions and power consumption while preserving reliability for small data packets
Solution Approach 2:
The patent implements dynamic behavior by allowing WTRUs to flexibly switch between idle, inactive, and connected modes based on the specific transmission requirements. The network can dynamically configure WTRUs to perform small data transmissions in idle or inactive modes when appropriate, creating an adaptive system that optimizes power consumption while maintaining transmission reliability through conditional mode selection
2Use of energy by moving object
If WTRU remains in idle or inactive mode for small data transmission, then power consumption is reduced, but resource utilization and transmission efficiency worsen
Solution Approach 1:
The patent applies preliminary action by pre-configuring WTRUs with the capability to perform small data transmissions while in idle or inactive modes. The network provides configuration information in advance that enables WTRUs to immediately transmit small data packets without mode transitions, thereby improving resource utilization and transmission efficiency while maintaining low power consumption states
Solution Approach 2:
The patent ensures continuity of useful action by enabling small data transmissions to occur continuously in idle or inactive modes without interrupting the WTRU's low-power state. This eliminates the discontinuity caused by mode transitions while maintaining transmission capability, thereby improving overall resource utilization and transmission efficiency without sacrificing power savings
3Productivity
If WTRU monitors for downlink transmissions in search space, then transmission efficiency is improved, but device complexity and processing requirements worsen
Solution Approach 1:
The patent applies local quality by directing WTRUs to monitor only specific search spaces configured for small data transmissions rather than all possible downlink transmissions. This localized monitoring approach improves transmission efficiency for small data packets while reducing the overall processing burden and device complexity by limiting monitoring to relevant, pre-configured resources
Data Source
AI summary
A WTRU operating in an inactive state may be associated with a first cell. The WTRU may be configured to receive configuration information for a time period associated with small data transmission failure detection and a search space associated with small data transmission. The WTRU may be configured to send a first small data transmission and start the time period. The WTRU may be configured to monitor for a downlink transmission in the search space during the time period. If a condition for cell reselection is satisfied during the time period or the restarted time period, the WTRU may be configured to suspend a data radio bearer (DRB) associated with small data transmission, select a second cell, perform a random access procedure associated with the second cell, and send a small data transmission. The random access procedure may include sending a request to resume a radio resource control (RRC) connection.