Multiple Access Signature Sequences for Uplink Interference Reduction
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Solution Overview
Problem
In 5G NR wireless communication systems, configured grant or grant-free communications using Non-orthogonal Multiple Access (NOMA) technologies can lead to interference and conflicts between multiple access signatures for UEs performing uplink transmissions simultaneously, due to the use of higher-layer signalings with long periodicity for resource configuration.
Innovation Solution
Configuring different multiple access signatures on distinct time-frequency resources for UEs, using a method that includes receiving control information indicating a multiple access signature sequence with a first and second signature, and transmitting radio signals based on these signatures, which occupy orthogonal Resource Elements (RE) sets, thereby reducing interference and conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a single multiple access signature is configured for a UE through higher-layer signaling, then signaling overhead is reduced, but interference and conflicts occur between non-orthogonal signatures of multiple UEs performing uplink transmissions simultaneously
Solution Approach 1:
The patent segments the multiple access signature configuration by dividing it into multiple signature sequences, where each sequence contains multiple signatures. The UE is configured with multiple signature sequences instead of a single signature, allowing different signatures to be used for different transmissions. This segmentation enables the system to reduce signaling overhead by reusing signature sequences while avoiding interference conflicts through the use of different signatures within the sequences.
2Object-affected harmful factors
If multiple multiple access signatures are configured for a UE, then interference between signatures is reduced, but signaling overhead increases
Solution Approach 1:
The patent implements periodic action by configuring multiple signature sequences with different periodicities. Each signature sequence can be activated periodically or on-demand, allowing the system to provide multiple signature options to reduce interference while controlling signaling overhead. The base station can indicate which signature sequence to use through periodic or event-triggered signaling, balancing the need for multiple signatures with signaling efficiency.
3Productivity
If non-orthogonal multiple access signatures are used for simultaneous uplink transmissions, then system capacity increases, but correlation between signatures causes interference
Solution Approach 1:
The patent applies dynamics by making the multiple access signature selection dynamic rather than static. The UE can dynamically select different signatures from configured signature sequences based on channel conditions, transmission requirements, and base station indications. This dynamic signature selection allows the system to maintain high capacity through non-orthogonal access while mitigating interference by adapting signature choices to current conditions, reducing correlation effects.
Data Source
AI summary
The disclosure provides a method and a device in a User Equipment (UE) and a base station for wireless communication. The UE, in turn, receives first control information, transmits a first and a second radio signal, wherein the first control information is used for indicating a first multiple access signature sequence, the first multiple access signature sequence includes a first and a second multiple access signature in turn, the first multiple access signature is used for generating the first radio signal based on a first bit block, and the second multiple access signature is used for generating the second radio signal based on a second bit block. According to the disclosure, different multiple access signatures are configured on different time-frequency resources for the UE, which reduces interferences or conflicts between uplink communications due to conflicts of multiple access signatures between multiple users or correlations between non-orthogonal multiple access signatures.