WTRU Inactive-State Mobility for Reliable Small Data
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Solution Overview
Problem
Existing mobile communication systems face inefficiencies in performing uplink and downlink small data transmission in idle or inactive mode without transitioning to connected mode, leading to suboptimal resource utilization and increased power consumption.
Innovation Solution
A wireless transmit/receive unit (WTRU) operates in an inactive state, utilizing configuration information for a time period and search space to perform small data transmission, monitoring for downlink transmissions, and initiating a random access procedure to a second cell when necessary, thereby optimizing data transmission without constant connection establishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a WTRU in idle or inactive mode performs small data transmission without transitioning to connected mode, then power consumption is reduced and resource utilization is improved, but transmission reliability and data completeness may deteriorate
Solution Approach 1:
The patent implements dynamic state transitions between inactive and connected modes based on transmission needs. The WTRU transitions to connected mode when downlink data is detected or uplink transmission fails, and returns to inactive mode when transmission succeeds, creating a flexible adaptation mechanism that balances power saving with transmission reliability
Solution Approach 2:
The patent employs feedback mechanisms including monitoring downlink assignments in search spaces, detecting transmission acknowledgments, and triggering state transitions based on transmission outcomes. This feedback loop ensures reliable data transmission while maintaining power efficiency by only transitioning to connected mode when necessary
2Productivity
If a WTRU monitors for downlink transmissions during a time period in inactive mode, then small data transmission efficiency is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent segments the monitoring process into specific search spaces and time periods configured for small data transmission. Instead of continuous monitoring, the WTRU monitors only in designated search spaces during configured time periods, reducing processing overhead while maintaining transmission efficiency
Solution Approach 2:
The patent uses configured parameters including time periods, search space identifiers, and monitoring occasions to control the monitoring behavior. These parameters are configured by the network and allow the WTRU to efficiently monitor for downlink transmissions without excessive processing requirements
3Reliability
If a WTRU performs cell reselection and random access procedure, then connectivity and data transmission capability are improved, but power consumption and transmission delay increase
Solution Approach 1:
The patent performs preliminary actions by maintaining configured parameters including time periods and search space configurations while in inactive mode. The WTRU prepares monitoring configurations in advance, allowing it to quickly transition to connected mode when needed without extensive setup delays
Solution Approach 2:
The patent enables the WTRU to skip certain procedures by utilizing pre-configured parameters and maintaining inactive mode connectivity. When small data transmission is needed, the WTRU can quickly activate connected mode without performing full cell reselection or random access procedures, reducing transmission delay
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.