Wireless Small Data Transmission Without RRC Connection Setup
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face inefficiencies in managing small data transmissions due to access category barring and the need for transitioning to an RRC connected state, leading to increased latency and resource utilization.
Innovation Solution
A method for wireless devices to perform small data transmissions (SDT) by sending a first message with a second access category that is not barred, receiving a subsequent transmission indication, and then transmitting packets based on this indication without being in an RRC connected state, allowing for efficient data exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a wireless device transmits data in RRC idle or inactive state using access category barring, then resource utilization is improved, but transmission latency increases due to the need to transition to RRC connected state
Solution Approach 1:
The patent segments the access category into multiple sub-categories (first access category and second access category) with different barring configurations. This allows the device to transmit urgent data packets using the second access category without barring, while non-urgent data uses the first access category with barring, thus resolving the contradiction between resource utilization and transmission latency by differentiating service priorities.
Solution Approach 2:
The patent changes the parameter of access category configuration by introducing multiple access categories with different barring parameters. The network can configure different access category values (e.g., 0-7) with specific barring factors, allowing dynamic adjustment of access priorities based on data urgency, thereby enabling low-latency transmission for critical data while maintaining resource efficiency for bulk data.
2Reliability
If the wireless device transitions to RRC connected state for data transmission, then transmission reliability is improved, but resource utilization deteriorates due to connection establishment overhead
Solution Approach 1:
The patent applies partial action by allowing the device to transmit only small data packets (below a threshold size) using the second access category without full RRC connection establishment. This partial transmission mode provides sufficient reliability for small packets while avoiding the resource overhead of complete connection setup, thus resolving the contradiction between reliability and resource utilization.
Solution Approach 2:
The patent implements preliminary action by pre-configuring multiple access categories with different barring parameters before data transmission. The device can immediately use the pre-configured second access category for urgent small packets without performing preliminary connection establishment procedures, thereby maintaining reliability while improving resource efficiency.
3Productivity
If access category barring is applied to all data transmissions, then resource utilization is improved, but transmission speed deteriorates for urgent data
Solution Approach 1:
The patent applies local quality by assigning different quality characteristics (barring parameters) to different access categories. The second access category is configured with no barring or relaxed barring for urgent data transmissions, while the first access category has strict barring for non-urgent data. This localized differentiation allows high-speed transmission for urgent packets while maintaining overall resource utilization through selective barring.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
A wireless device not in a radio resource control (RRC) connected state transmits, to a base station that bars a first access category, a first message for a small data transmission (SDT) procedure. The first message comprises an RRC request message and second uplink data associated with a second access category that is not barred. The wireless device not in the RRC connected state receives, from the base station, a second message indicating subsequent transmission associated with the SDT procedure. The wireless device not in the RRC connected state transmits, based on the receiving the second message indicating the subsequent transmission associated with the SDT procedure, a packet associated with the first access category.