Terminal-Controlled TBS Selection for Flexible 2-Step RACH
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Solution Overview
Problem
The 2-step Random Access Channel (RACH) procedure in 5G NR lacks flexibility in uplink resource allocation, leading to inefficiencies and potential latency issues due to variable uplink data amounts and fixed Transport Block Sizes (TBS), which are not suitable for diverse service requirements.
Innovation Solution
A terminal dynamically determines parameters such as TBS and resource allocation for the data part of the random access signal, implicitly notifying the base station through the RACH preamble resource selection, allowing flexible and efficient uplink transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed Transport Block Sizes (TBS) are used in the 2-step RACH procedure, then the base station can simplify resource allocation and demodulation processing, but the system cannot adapt to variable uplink data amounts, leading to resource waste and latency issues
Solution Approach 1:
The patent applies dynamics by making the TBS configurable and adaptable rather than fixed. The base station can dynamically adjust the TBS parameter based on the actual uplink data amount, transforming the static resource allocation into a dynamic system that responds to varying traffic conditions, thus resolving the contradiction between simplified processing and adaptability.
Solution Approach 2:
The patent changes the TBS parameter from a fixed value to a configurable parameter. By allowing the TBS to be adjusted according to the data amount, the system can optimize resource utilization for different traffic scenarios while maintaining manageable base station complexity through parameterization rather than structural complexity.
2Productivity
If flexible resource allocation is implemented to adapt to variable data amounts, then the system can improve resource utilization and reduce latency, but the overhead for parameter signaling and processing increases
Solution Approach 1:
The patent makes the random access signal multi-functional by embedding both the access request and the TBS indication within the same signal structure. This universal approach allows the signal to serve multiple purposes simultaneously - establishing connection and conveying resource allocation parameters - thereby improving resource utilization without proportionally increasing overhead.
Solution Approach 2:
The patent merges the TBS indication with the random access preamble or uplink signal. By combining multiple functions (access request and resource parameter indication) into a single signal transmission, the system achieves flexible resource allocation while minimizing the additional overhead that would result from separate signaling messages.
3Ease of operation
If the terminal uses predetermined TBS values, then the transmission process is simplified and faster, but the accuracy of resource allocation deteriorates when data amounts vary
Solution Approach 1:
The patent applies preliminary action by having the base station pre-configure multiple TBS options and their associated parameters before the actual data transmission. The terminal can then quickly select from these pre-prepared configurations based on the data amount, maintaining simple and fast operation while achieving accurate resource allocation through the pre-calculated options.
Solution Approach 2:
The patent enables the terminal to select from multiple configurable TBS parameters rather than being locked into a single fixed value. This parameter-based approach allows the terminal to maintain simple operation by selecting from predefined options while achieving accurate resource allocation by matching the selected parameter to the actual data amount.
Data Source
AI summary
A terminal, with which it is possible to improve the efficiency of a random access process. In a terminal, a control unit dynamically determines a parameter pertaining to the transmission of a data part out of a random access signal that includes a preamble part and the data part. A transmission unit notifies the determined parameter to a base station using the random access signal.