Small Data Transmission Paging With Tiered UE Backoff Ranges
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Solution Overview
Problem
In wireless communication networks, transitioning from RRC Inactive to RRC Connected state for small data transmission results in significant overhead due to control signaling and power consumption, particularly when multiple UEs collide during the Random Access Channel procedure, leading to increased retransmissions and congestion.
Innovation Solution
The solution involves configuring User Equipment (UE) with a UE-specific backoff parameter value (BPV) range in the paging message based on data volume threshold and priority, ensuring non-overlapping backoff times to reduce collisions and optimize RACH congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs use random backoff time selection during RACH procedure, then collision probability increases, but implementation simplicity is maintained
Solution Approach 1:
The patent changes the parameter of backoff time selection from completely random to structured random based on UE priority and data volume. High-priority UEs with large data volumes select from [0, BPV1], medium-priority UEs with medium data volumes select from [BPV1, BPV2], and low-priority UEs with small data volumes select from [BPV2, BPV3]. This parameter change reduces collision probability while maintaining reasonable implementation complexity.
Solution Approach 2:
The patent applies local quality by differentiating backoff time ranges for different UE categories. Instead of a uniform random selection for all UEs, each UE category (defined by priority and data volume) is assigned a specific backoff range. This localized approach ensures that UEs with different characteristics experience different collision probabilities appropriate to their needs.
2Reliability
If UEs transition to RRC Connected state for small data transmission, then data can be transmitted reliably, but signaling overhead and power consumption increase
Solution Approach 1:
The patent applies partial action by allowing UEs to remain in RRC Inactive state for small data transmissions when conditions permit. By configuring appropriate backoff parameters and allowing selective random access, the system achieves sufficient transmission reliability without the full overhead of RRC state transition, thus reducing power consumption while maintaining acceptable reliability.
Solution Approach 2:
The patent introduces dynamics by making the backoff parameter configurable and adaptable. The base station can adjust BPV1, BPV2, and BPV3 values based on network conditions, UE behavior, and traffic patterns. This dynamic adjustment allows the system to optimize the balance between transmission reliability and power consumption in real-time.
3Productivity
If multiple UEs select overlapping backoff times, then RACH congestion increases, but backoff parameter configuration complexity is reduced
Solution Approach 1:
The patent changes the backoff parameter structure from a single uniform value to a tiered system with BPV1, BPV2, and BPV3. This parameter change creates distinct time ranges for different UE categories, reducing RACH congestion by spreading out access attempts across different time windows. The increased parameter configuration complexity is justified by the significant improvement in RACH procedure efficiency.
Solution Approach 2:
The patent segments the backoff time range into three distinct segments: [0, BPV1] for high-priority UEs, [BPV1, BPV2] for medium-priority UEs, and [BPV2, BPV3] for low-priority UEs. This segmentation reduces collisions by ensuring that UEs with different priorities access the RACH at different times, thereby improving overall RACH procedure efficiency despite the increased configuration complexity.
Data Source
AI summary
A base station transmits small-data-transmission data to a user equipment. The user equipment is set to an inactive state. The base station provides the small-data-transmission data. The base station sends a paging notification having a backoff-parameter-value range to the user equipment The user equipment receives the backoff-parameter-value range. The user equipment selects a backoff time according to the backoff-parameter-value range.