NPUSCH OCC Signaling for Dynamic NTN Uplink Multiplexing
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Solution Overview
Problem
Existing wireless communication systems face limitations in flexibility and efficiency, particularly in supporting multiple user equipment (UE) devices with varying capabilities and requirements, especially in non-terrestrial networks (NTN), necessitating improved methods for orthogonal cover code (OCC) multiplexing and signaling.
Innovation Solution
Implementing dynamic OCC on/off and OCC multiplexing factor indication through DCI format N0, utilizing additional RNTIs and repurposing DCI fields to efficiently signal OCC parameters without increasing DCI size, and configuring OCC semi-statically or dynamically based on UE capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If OCC multiplexing is implemented to support multiple UEs, then uplink capacity is improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting OCC multiplexing factors and OCC on/off states based on UE capabilities and network conditions. Different OCC multiplexing factors (e.g., 2, 4, 8) are configured for different UEs, allowing the system to optimize uplink capacity while adapting complexity to individual device requirements rather than uniformly increasing complexity for all devices.
Solution Approach 2:
The patent implements dynamics through dynamic OCC configuration where the network can switch OCC multiplexing on or off and adjust multiplexing factors in real-time based on traffic conditions and UE capabilities. This dynamic approach allows the system to increase uplink capacity when needed while reducing complexity when OCC multiplexing is not required, resolving the contradiction between capacity improvement and complexity increase.
2Adaptability or versatility
If dynamic OCC configuration is implemented, then flexibility is improved, but signaling overhead increases
Solution Approach 1:
The patent applies segmentation by dividing OCC configuration into separate components: OCC on/off indication, OCC multiplexing factor indication, and OCC index indication. These segmented signaling elements can be transmitted through different DCI fields or messages, allowing flexible configuration while managing signaling overhead by only transmitting necessary parameters for each UE's specific requirements.
Solution Approach 2:
The patent implements universality by using existing DCI format N0 fields for OCC signaling, allowing the same DCI structure to serve multiple purposes: scheduling uplink resources and configuring OCC parameters. This multi-functionality approach provides dynamic OCC configuration flexibility while avoiding additional dedicated signaling overhead, as the existing DCI infrastructure is leveraged for dual purposes.
3Adaptability or versatility
If OCC multiplexing factor indication is added to DCI, then adaptability is improved, but DCI size increases
Solution Approach 1:
The patent applies dimensionality change by utilizing the RNTI (Radio Network Temporary Identifier) dimension for OCC signaling. Instead of adding bits to DCI, the patent uses different RNTIs (e.g., OCC-RNTI, C-RNTI) to indicate different OCC multiplexing factors and configurations. This approach provides adaptability through multiple RNTI-based signaling dimensions while keeping the DCI payload size unchanged, effectively resolving the contradiction between adaptability and DCI size.
Data Source
AI summary
An internet of things (IoT) non-terrestrial network (NTN) device user equipment (UE) is described. The UE includes receiving circuitry configured to receive a separately configured orthogonal cover code radio network temporary identifier (OCC-RNTI) and/or a number of repetitions table for a repetition number field in downlink control information (DCI) format 0. The receiving circuitry may also be configured to receive a DCI format N0 for a narrowband physical uplink shared channel (NPUSCH) transmission with an OCC signaling including whether OCC is applied, and if OCC is applied, an OCC multiplexing factor and an OCC index. The UE also includes transmitting circuitry configured to transmit a NPUSCH with OCC multiplexing with the provided OCC multiplexing factor and the indicated OCC index on a schedule resource if OCC is indicated, or transmit an NPUSCH without OCC multiplexing on the schedule resource if OCC is not indicated.