RedCap UE Random Access Around Half-Duplex RF Switching Gaps
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Solution Overview
Problem
Existing communication methods for reduced-capability (RedCap) UEs in wireless communication systems, particularly those using a half-duplex operation, face inefficiencies in resource allocation during random access procedures due to overlapping radio frequency switching gaps, leading to incomplete or failed access attempts.
Innovation Solution
A method and device for RedCap UEs that identify overlapping RF switching gaps in the time domain and perform random access procedures on subsequent non-overlapping occasions based on received configuration information, ensuring efficient resource allocation and successful access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RedCap UE performs random access procedure on overlapping random access occasion with RF switching gap, then random access can be performed according to standard procedure, but the random access fails or is incomplete due to RF switching gap interference
Solution Approach 1:
The base station performs preliminary identification of RF switching gaps and proactively excludes overlapping random access occasions from resource allocation. This preliminary action prevents the conflict before it occurs, ensuring reliable random access without requiring UE to handle the interference during the actual access procedure.
Solution Approach 2:
The overlapping random access occasions are extracted and removed from the set of available random access resources. By taking out the problematic resources that would cause interference with RF switching gaps, the system maintains clean, interference-free random access opportunities for RedCap UEs.
2Device complexity
If RedCap UE uses half-duplex operation to reduce device complexity, then device complexity is reduced, but resource allocation becomes inefficient due to RF switching gaps
Solution Approach 1:
The base station applies local quality adjustment by providing differentiated random access resource configurations specifically tailored for half-duplex RedCap UEs. The resource allocation is locally optimized to account for RF switching gaps, ensuring that these UEs receive appropriate resources that do not conflict with their half-duplex operation constraints.
Solution Approach 2:
The random access resource allocation is made dynamic by allowing the base station to identify and adapt to the RF switching gap patterns of half-duplex UEs. The system dynamically adjusts which random access occasions are allocated based on the specific timing and duration of RF switching gaps, optimizing resource utilization for half-duplex operation.
3Ease of operation
If base station allocates random access resources without considering RF switching gaps, then resource allocation is simple and fast, but overlapping occasions cause access failures
Solution Approach 1:
The base station uses feedback mechanisms to identify RF switching gap patterns and adjusts random access resource allocation accordingly. By incorporating feedback about the UE's half-duplex operation characteristics, the base station can reliably determine which random access occasions to allocate without causing interference, maintaining both simplicity and reliability.
Data Source
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AI summary
An efficient communication method and device for a Reduced-capability UE using a half-duplex communication scheme in a wireless communication system. According to an embodiment, a method for performing a random access procedure by a reduced-capability user equipment (UE) in a wireless communication system comprises receiving, from a base station, configuration information including resource information for random access by the Reduced-capability UE, identifying whether there is a random access occasion overlapping a radio frequency (RF) switching gap in a time domain when the random access is performed, and when there is the random access occasion overlapping the RF switching gap, performing the random access procedure with the base station on a next random access occasion except for the overlapping random access occasion, based on the received resource information for random access.