Random Access Preamble Set Selection for Uplink Resource Allocation
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Solution Overview
Problem
The current mobile communication systems, particularly in LTE, face inefficiencies in scheduling uplink messages due to limited information available in random access preambles, leading to suboptimal radio resource allocation and increased collision probabilities among UEs.
Innovation Solution
The method involves dividing random access preambles into two sets based on channel conditions and message sizes, allowing UEs to select preambles that convey supplemental information for efficient resource allocation, enabling the network node to schedule messages effectively even at cell boundaries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If random access preambles are used for uplink message transmission scheduling, then resource allocation can be performed, but the limited information in preambles leads to suboptimal allocation and increased collision probabilities
Solution Approach 1:
The random access preambles are divided into multiple groups, where each group is associated with different message size ranges. This segmentation allows the system to select appropriate preamble groups based on the actual message size, improving scheduling accuracy while reducing collisions between UEs with different traffic requirements.
Solution Approach 2:
Different preamble groups are assigned different properties (message size characteristics) to match specific transmission scenarios. By matching preamble group properties with actual message sizes, the system achieves localized optimization for different traffic types, improving overall scheduling efficiency and reducing inappropriate resource allocations.
2Ease of operation
If traditional random access preambles are used without supplemental information, then the procedure is simple, but resource allocation becomes suboptimal especially at cell boundaries
Solution Approach 1:
The UE determines the appropriate preamble group in advance based on the message size before initiating the random access procedure. This preliminary classification allows the network node to pre-prepare appropriate resource allocations, improving scheduling efficiency without adding complexity to the actual transmission procedure.
Solution Approach 2:
The preamble group selection acts as an intermediary that conveys supplemental information about message size characteristics. This intermediary mechanism enables the network node to infer resource allocation requirements without direct communication, maintaining procedure simplicity while improving allocation accuracy.
3Productivity
If more information is included in random access preambles for better scheduling, then resource allocation improves, but the preamble structure becomes more complex
Solution Approach 1:
Instead of adding comprehensive information to each preamble, the system segments information transmission into two stages: (1) preamble group selection that conveys message size characteristics, and (2) subsequent messaging that carries detailed information. This segmentation reduces individual preamble complexity while maintaining overall scheduling efficiency.
Solution Approach 2:
The preamble structure includes only the essential supplemental information (message size category) needed for initial resource allocation, rather than complete message details. This partial information approach provides sufficient scheduling capability while keeping the preamble structure simple and manageable.
Data Source
AI summary
Disclosed is a method for performing a random access by a user equipment (UE), including identifying a path loss and a size of a message that the UE will transmit after a transmission of a preamble, selecting a preamble set from at least two preamble sets based on a first threshold and a second threshold, wherein a first preamble set is selected if the path loss is less than the first threshold and the size of the message is greater than the second threshold, wherein a second preamble set is selected if the path loss is greater than or equal to the first threshold, or the size of the message is less than or equal to the second threshold, selecting a preamble from the selected preamble set, transmitting, to a base station, the selected preamble, receiving, from the base station, a random access response message including resource allocation information in response to the transmission of the selected preamble, and transmitting, to the base station, a radio resource control message based on the resource allocation information.