Small Data Transmission Backoff Mapping for RACH Collision Reduction
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Solution Overview
Problem
The existing Mobile Terminated-Small Data Transmission (MT-SDT) in RRC Inactive state experiences high collision rates during Random Access procedures due to overlapping backoff time selections among User Equipments (UEs), leading to increased power consumption and signaling overhead.
Innovation Solution
A method where User Equipments (UEs) select backoff times based on data volume/priority indicated in the paging message, reducing collisions by providing non-overlapping backoff time ranges, thereby minimizing the need for multiple PRACH transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs select backoff times randomly from overlapping ranges, then the Random Access procedure can be initiated, but collision rates increase leading to multiple PRACH transmissions and higher power consumption
Solution Approach 1:
The patent applies parameter changes by dividing UEs into different groups based on their data characteristics (e.g., data volume, data priority) and assigning each group specific backoff time ranges. This parameter differentiation ensures that UEs with different traffic patterns select non-overlapping backoff times, reducing collisions and the need for retransmissions, thereby lowering power consumption while maintaining reliable RACH procedure success.
2Reliability
If UEs select backoff times from overlapping ranges, then the Random Access procedure can be initiated, but RACH congestion increases due to multiple PRACH transmissions
Solution Approach 1:
The patent changes the backoff time parameter by creating distinct ranges for different UE groups based on their data characteristics. This parameter segmentation reduces RACH congestion by distributing access attempts across different time intervals, improving overall RACH procedure efficiency while maintaining high success rates.
Solution Approach 2:
The patent segments the UE population into different groups (e.g., based on data volume or priority) and assigns each segment specific backoff time ranges. This segmentation prevents overlapping selections and reduces collisions, thereby improving RACH procedure efficiency and reducing congestion.
3Reliability
If UEs transmit multiple PRACH messages due to collisions, then data transmission can eventually be established, but signaling overhead increases
Solution Approach 1:
The patent modifies the backoff time parameter selection based on UE-specific characteristics, which reduces the probability of collisions and subsequent retransmissions. This parameter optimization ensures that UEs can establish data transmission with fewer signaling exchanges, thereby reducing overall signaling overhead while maintaining reliable transmission completion.
Data Source
AI summary
Small Data Transmission, SDT, data is transmitted from a base station, BS, to a user equipment, UE. The BS communicates a first mapping table and/or a second mapping table. The first and second mapping may include a range of Backoff Parameter Values, BPVs. The first mapping table describes the BPV range as a function of a data volume of the SDT data, and/or the second mapping table describes the BPV range as a function of a data priority. The UE receives the first mapping table and/or the second mapping table. The UE is set to an inactive state. The BS provides the SDT data. The BS sends a paging notification to the UE. The paging notification includes a data volume of the SDT data. The UE selects a backoff time according to the BPV range.