Random Access Preamble Partitioning for Early Data Transmission
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Solution Overview
Problem
Current LTE specifications do not allow for uplink or downlink data transmission before the contention-based random access procedure is completed, limiting the ability to send data early during the random access procedure, which is crucial for reducing power consumption and latency in Machine-Type Communications (MTC) and Internet of Things (IoT) applications.
Innovation Solution
The implementation of 'virtual partitioning' of random access preambles, where UEs capable of early data transmission select from a specific partition, allowing the base station to infer capability without hard partitioning, which reduces trunking losses and maintains backward compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hard partitioning of random access preambles is used to enable early data transmission, then capability indication is achieved, but trunking losses increase and capacity is reduced
Solution Approach 1:
The set of random access preambles is divided into two partitions: a first partition for UEs capable of early data transmission and a second partition for legacy UEs. This segmentation enables capability indication through preamble selection while managing system capacity by directing different UE types to appropriate partitions.
Solution Approach 2:
Different partitions of preambles are assigned different functional qualities: the first partition is optimized for early data transmission capability indication, while the second partition maintains compatibility with legacy procedures. This local differentiation resolves the contradiction by providing specialized functionality where needed while preserving overall system capacity.
2Adaptability or versatility
If hard partitioning of random access preambles is used to enable early data transmission, then capability indication is achieved, but device complexity increases
Solution Approach 1:
The system dynamically adapts to UE capability through preamble selection rather than requiring complex explicit signaling. The base station dynamically determines whether to allocate early data resources based on which partition the UE selected, reducing the need for additional capability exchange messages and simplifying the overall procedure.
Solution Approach 2:
The UE self-identifies its capability by selecting from the appropriate preamble partition, eliminating the need for explicit capability signaling. The base station self-determines the appropriate resource allocation based on the selected preamble, reducing mutual information exchange and procedural complexity.
3Loss of time
If early data transmission is enabled during random access procedure, then power consumption and latency are reduced, but compatibility with legacy UEs is compromised
Solution Approach 1:
The preamble set is segmented into two distinct partitions that coexist within the same random access procedure. Legacy UEs naturally select from the second partition and follow traditional procedures, while capable UEs select from the first partition to enable early data transmission. This segmentation allows both legacy compatibility and enhanced functionality to operate simultaneously without interference.
Solution Approach 2:
The random access procedure is designed to serve multiple functions: it maintains backward compatibility with legacy UEs while simultaneously enabling early data transmission for capable UEs. The single unified procedure handles both UE types through partitioned preamble selection, avoiding the need for separate procedures and ensuring universal compatibility.
Data Source
AI summary
The invention refers to a method at a user equipment for performing a random access procedure, wherein the UE randomly selects a random access preamble from a given set of preambles to be used for the random access procedure, the method comprising the steps of detecting (420) a partitioning of the given set of random access preambles into a first and a second partition, detecting (430) a certain capability of the UE, and selecting (440) a random access preamble from the fist partition to indicate the certain capability to a base station; the invention further refers to a corresponding method in a base station, a corresponding UE, and a corresponding base station.