Multiplexing random access transmissions with different spatial filters
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently multiplexing random access transmissions using different spatial filters due to overlapping time and frequency resources, leading to ambiguity and reduced throughput and increased latency.
Innovation Solution
A network node transmits random access messages using a rule set for multiplexing, allowing instances of messages to be transmitted using the same or different spatial filters based on overlapping time or frequency, with rules indicated by messages or pre-configured in the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If random access transmissions use different spatial filters for overlapping time and frequency resources, then communication reliability is improved, but resource ambiguity increases
Solution Approach 1:
The patent segments random access transmissions by associating different spatial filters with different time resources (different instances of random access occasions). This segmentation allows the system to distinguish between overlapping transmissions using different spatial filters, reducing resource ambiguity while maintaining communication reliability through diverse spatial paths.
Solution Approach 2:
The patent introduces a temporal dimension to spatial filter differentiation. By mapping spatial filters to different time instances of random access occasions, the system resolves resource ambiguity in the time domain while maintaining spatial diversity for reliability improvement.
2Loss of information
If random access transmissions use the same spatial filter for overlapping resources, then resource ambiguity is reduced, but communication reliability decreases
Solution Approach 1:
The patent dynamically selects spatial filters based on the specific time instance and configuration of random access occasions. The system adapts spatial filter usage according to whether occasions overlap in time, optimizing the balance between reducing ambiguity and maintaining reliability through dynamic spatial resource allocation.
3Productivity
If multiple spatial filters are used for random access transmissions, then throughput is improved, but system complexity increases
Solution Approach 1:
The patent creates a universal framework where spatial filters serve multiple functions: they provide spatial diversity for reliability, enable multiplexing for throughput improvement, and act as identifiers for resolving resource ambiguity. This multi-functionality allows the system to achieve throughput gains without proportionally increasing complexity.
Solution Approach 2:
The patent changes the parameter of spatial filter selection based on the temporal configuration of random access occasions. By dynamically adjusting which spatial filters are used in different time instances, the system optimizes throughput while managing complexity through parameter-based control rather than structural complexity.
4Loss of time
If random access transmissions use different spatial filters for overlapping occasions, then latency is reduced, but resource management complexity increases
Solution Approach 1:
The patent establishes preliminary rules and configurations for spatial filter selection before random access transmissions occur. By pre-defining the mapping between spatial filters and time instances of random access occasions, the system reduces latency through pre-planned resource allocation while managing complexity through standardized procedures rather than ad-hoc decisions.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. In some systems, a first network node may transmit a first synchronization signal block (SSB) associated with a first spatial filter and a first set of random access occasions within a respective instance of a random access occasion window and a second SSB associated with a second spatial filter and a second set of random access occasions that overlap in time with the first set of random access occasions during the random access occasion window. A second network node may receive the SSBs and transmit instances of a random access message during one or more instances of the random access occasion window using the first spatial filter, the second spatial filter, or both based on a rule for random access message multiplexing when random access occasions associated with different spatial filters to be used for random access messages overlap in time.