Random Access Occasion Beam Mapping for Full Duplex Interference
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Solution Overview
Problem
In wireless communication systems, full-duplex mode operations lead to interference between synchronization signal blocks (SSBs) and random access preambles due to overlapping time resources, which reduces communication efficiency.
Innovation Solution
A method where a base station transmits an indicator mapping random access occasions to uplink beams associated with different synchronization signal block resources, allowing the user equipment to transmit random access preambles using non-reciprocal beams, thereby reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex mode is used to enable simultaneous transmission and reception, then communication efficiency is improved, but interference between SSB resources and random access preambles increases
Solution Approach 1:
The patent introduces spatial dimension (beam direction) as a new degree of freedom to resolve the time-resource conflict. By mapping random access occasions to uplink beams that are spatially separated from the downlink SSB beams, the system achieves interference avoidance without sacrificing the time efficiency of full-duplex operation. This dimensional transition from time-only separation to space-time separation enables simultaneous transmission and reception without mutual interference.
Solution Approach 2:
The patent applies different beam directions for different operations within the same time resource. Specifically, each random access occasion is associated with a specific uplink beam that is locally optimized to avoid interference with the downlink SSB beam in that particular time slot. This localized beam selection allows full-duplex operation to proceed efficiently in each local time-beam combination while maintaining overall system efficiency.
2Productivity
If random access occasion overlaps with synchronization signal block resource in time, then time resource utilization is improved, but interference between transmission and reception increases
Solution Approach 1:
The patent resolves the time-overlap conflict by introducing spatial separation through beam mapping. The base station configures a mapping between random access occasions and uplink beams such that the uplink beam for a given random access occasion is spatially separated from the downlink beam used for the overlapping SSB resource. This spatial dimension allows both transmissions to occur simultaneously in the same time slot without interfering with each other.
Solution Approach 2:
The beam mapping configuration acts as an intermediary mechanism that mediates between the conflicting transmissions. By introducing this intermediate mapping layer, the system can simultaneously support full-duplex operation and interference avoidance. The mapping configuration enables the UE to select the appropriate uplink beam based on the random access occasion index, ensuring spatial separation from the downlink SSB beam.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some examples, a random access occasion may overlap in time with a synchronization signal block resource, where the random access occasion and the synchronization signal block resource have a same index. In some such examples, a base station may transmit, to a user equipment (UE), an indicator of a mapping of the random access occasion to an uplink beam that is associated with a synchronization signal block resource with a different index than the random access occasion. The UE may transmit, to the base station, a random access preamble over the random access occasion using the uplink beam.