Random Access Response Scheduling With TB Scaling for RedCap Coverage
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing reduced capability devices, particularly in terms of coverage and resource allocation during random access procedures, which affect the performance and connectivity of such devices.
Innovation Solution
The proposed method involves a wireless device receiving system information blocks indicating random-access resources with specific transport block scaling factors, followed by determining a TB scaling factor based on a first field in the downlink control information, and then receiving the TB using this factor, thereby optimizing resource allocation for reduced capability devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If random access resources are allocated for reduced capability devices without specific TB scaling factors, then resource allocation simplicity is maintained, but coverage and connectivity performance deteriorates
Solution Approach 1:
The patent applies local quality by introducing device-specific TB scaling factors tailored to reduced capability devices. The base station configures different scaling factors (e.g., 0.5, 0.25, 0.125) based on device capabilities, allowing optimized resource allocation for specific device types while maintaining standard allocation for others. This resolves the contradiction by improving coverage for RedCap devices without complicating the overall system through universal complexity.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the transport block size scaling factor based on device type and channel conditions. The base station modifies the TB scaling parameter in DCI messages to adapt resource allocation for reduced capability devices, thereby improving their coverage and connectivity without requiring fundamental changes to the resource allocation framework.
2Productivity
If standard transport block sizes are used for reduced capability devices, then resource allocation simplicity is maintained, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent applies dynamics by making the TB scaling factor adjustable and adaptive rather than fixed. The base station can dynamically select and communicate appropriate scaling factors to reduced capability devices based on current resource conditions, device capabilities, and channel quality. This enables optimized resource utilization efficiency while managing complexity through controlled adaptability.
3Productivity
If multiple TB scaling factors are supported, then resource allocation optimization for reduced capability devices is improved, but device complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring multiple TB scaling factors in the system before actual resource allocation occurs. The base station prepares a set of scaling factors (e.g., {0.5, 0.25, 0.125}) and makes them available for selection based on device type. This allows optimized resource allocation for reduced capability devices while simplifying the determination process, as devices can select from pre-defined options rather than calculating optimal values in real-time.
Data Source
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Figure 2A~2B
Figure 3
AI summary
A wireless device, having first features, receives at least one system information block (SIB) indicating random access resources for wireless devices having the first features. The random access resources are associated with a first set of transport block (TB) scaling factors among a plurality of sets of TB scaling factors. In response to transmission of a preamble indicated by the random access resources, a downlink control information (DCI) is received that indicates reception of a TB including a response to the preamble. The DCI includes a first field for scaling the TB. Based on the first scaling field and the wireless device having the first features, a TB scaling factor is determined from the first set of TB scaling factors. The TB is received based on the TB scaling factor