Sidelink PSSCH Transmission Diversity Against Narrowband Interference
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Solution Overview
Problem
Existing 5G/6G wireless communications systems face challenges in reliably transmitting and receiving data in the presence of high-power narrowband interferers, such as RADAR interference, which disrupts PSCCH/PSSCH/PSFCH channels, leading to unreliable data and signaling traffic.
Innovation Solution
Implementing mechanisms for robust PSSCH transmission and reception by using alternative Transmit Resource Pools (TxRPs) and enhancing frequency diversity through distally located TxRPs, along with HARQ transmissions and feedback channels to mitigate narrowband interferers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional single TxRP is used for PSSCH transmission, then device complexity is low, but reliability deteriorates due to narrowband interferers
Solution Approach 1:
The patent divides the transmit resource pool into multiple alternative TxRPs (first alternative TxRP, second alternative TxRP, etc.) located at different frequency positions. This segmentation allows the system to switch between different frequency segments when narrowband interferers are detected, thereby maintaining transmission reliability without requiring complete reconfiguration of the entire resource pool.
Solution Approach 2:
The patent implements dynamic selection and switching between multiple alternative TxRPs based on interference detection. The transmitting WTRU can dynamically determine which TxRP to use by detecting narrowband interferers and selecting an alternative TxRP that avoids the interfered frequency band, enabling adaptive response to changing interference conditions.
2Reliability
If alternative TxRPs are introduced for interference avoidance, then reliability improves, but device complexity increases
Solution Approach 1:
The patent pre-configures multiple alternative TxRPs with different frequency positions before transmission begins. The network or higher-layer protocol预先 establishes these alternative resource pools, so when interference is detected during operation, the system can immediately switch to a pre-prepared alternative TxRP without complex real-time configuration, reducing operational complexity.
Solution Approach 2:
The patent changes the frequency position parameter of the transmit resource pool by selecting different alternative TxRPs. Each alternative TxRP is defined by different frequency position parameters, allowing the system to avoid narrowband interferers by changing this key parameter rather than redesigning the entire resource allocation structure.
3Reliability
If frequency diversity is enhanced using distally located TxRPs, then robustness against narrowband interferers improves, but loss of information increases due to resource switching
Solution Approach 1:
The patent incorporates feedback mechanisms where receiving WTRUs send HARQ feedback and interference status information back to transmitting WTRUs. This feedback loop allows the system to identify when transmissions fail due to interference and triggers retransmissions using alternative TxRPs, ensuring that information is successfully delivered despite the complexity of resource switching.
Solution Approach 2:
The patent employs periodic HARQ retransmissions and interference detection cycles. If initial transmissions on a primary TxRP fail due to narrowband interferers, the system periodically attempts retransmissions on alternative TxRPs, ensuring information delivery through repeated opportunities rather than requiring perfect first-attempt success.
Data Source
AI summary
A wireless transmit receive unit (WTRU) and methods are disclosed for mitigating narrowband interference on sidelink communications. The method may include: receiving, at a WTRU, SCI, the SCI including information indicating at least one alternative TxRP different from the TxRP used for SCI is transmission, reserving, at the WTRU, resources on the at least one alternative TxRP according to the information indicated by the received SCI; and transmitting, by the WRTU, at least one of: a PSCCH, and a PSSCH, alone or in combination, via the reserved resources for a Hybrid Automatic Repeat Request HARQ transmission or HARQ retransmission, or a PSFCH for HARQ feedback, on the at least one alternative TxRP. The method may also include determining a rank of PSSCH transmission based on a CSI-RS, determining to apply PSSCH layer aggregation according to a channel quality when the determined rank is greater than 1.