RedCap UE PRACH Resource Segmentation for Network Capacity
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Solution Overview
Problem
New Radio (NR) network devices with a reduced number of antenna branches, known as redcap devices, face challenges in balancing cost reduction, implementation feasibility, and network performance, as they can lead to a loss of network capacity and spectral efficiency.
Innovation Solution
Implementing a processor in user equipment (UE) to receive and transmit system information blocks with dedicated physical random access channel (PRACH) resources, allowing redcap devices to explicitly indicate their capabilities to the base station, thereby defining and reporting specific redcap device types based on parameters like the number of receive antenna branches and data rate limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the number of UE antenna branches is reduced to lower cost and complexity, then device cost and complexity are reduced, but network capacity and spectral efficiency deteriorate
Solution Approach 1:
The patent segments the random access resources by creating separate PRACH resources specifically for redcap devices with reduced antenna branches. This segmentation allows the network to identify and separately manage devices with different capabilities, enabling optimized resource allocation that maintains network capacity while supporting cost-reduced devices.
Solution Approach 2:
The patent changes the parameter configuration by introducing dedicated PRACH resources with specific time-frequency allocations for redcap devices. This parameter change enables the network to adapt its resource allocation strategy based on device capability, thereby maintaining overall network performance while supporting devices with reduced antenna branches.
2Device complexity
If the number of UE antenna branches is reduced to lower cost and complexity, then device cost and complexity are reduced, but spectral efficiency deteriorates
Solution Approach 1:
The patent segments the random access resources by creating separate PRACH resources specifically for redcap devices with reduced antenna branches. This segmentation allows the network to identify and separately manage devices with different capabilities, enabling optimized resource allocation that maintains network capacity while supporting cost-reduced devices.
Solution Approach 2:
The patent implements a feedback mechanism where UEs indicate their redcap device type through specific PRACH resource selection, and the network responds with appropriate configuration parameters. This feedback loop enables the network to adapt resource allocation to device capabilities, minimizing spectral efficiency loss while supporting reduced-complexity devices.
3Adaptability or versatility
If dedicated PRACH resources are configured for redcap devices, then support for redcap devices is improved, but network resource allocation complexity increases
Solution Approach 1:
The patent creates a universal framework where the same PRACH resource segmentation mechanism can serve multiple device types (legacy and redcap). This multi-functionality allows the network to handle diverse device capabilities through a unified resource allocation approach, improving adaptability without proportionally increasing complexity.
Data Source
AI summary
A user equipment (UE) is configured to receive a system information block (SIB) from a base station, wherein a dedicated set of physical random access channel (PRACH) resources for redcap devices are explicitly configured in the SIB and transmit, in response to the SIB, an indication to the base station that the UE is a reduced capability (redcap) device.