NB-IoT NPUSCH OCC Scheduling With Dynamic Index Indication
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Solution Overview
Problem
Existing wireless communication systems face limitations in flexibility and efficiency, particularly in the context of Narrowband Internet of Things (NB-IoT) Non-Terrestrial Network (NTN) devices, where orthogonal cover codes (OCC) for NPUSCH are not adequately supported, leading to potential performance degradation and limited uplink capacity.
Innovation Solution
Implementing semi-static OCC configuration with dynamic DCI indication for OCC index, using additional RNTIs and repurposing fields in DCI format N0 to efficiently indicate OCC index and length, ensuring flexible and efficient NPUSCH transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If semi-static OCC configuration is implemented without dynamic DCI indication, then device complexity is reduced, but uplink capacity and flexibility are limited
Solution Approach 1:
The patent implements dynamic OCC index indication through DCI format N0, allowing the OCC index to be dynamically selected from semi-statically configured OCC groups. This enables the system to adapt to varying uplink capacity requirements while maintaining the simplicity of semi-static configuration for the OCC groups themselves.
Solution Approach 2:
The patent divides the OCC configuration into two layers: semi-static OCC group configuration and dynamic OCC index indication. This segmentation allows the system to pre-configure multiple OCC groups for different scenarios while dynamically selecting the appropriate OCC index within those groups, balancing complexity and adaptability.
2Productivity
If OCC support is added to NPUSCH, then uplink capacity is improved, but communication structure complexity increases
Solution Approach 1:
The patent extends the existing DCI format N0, which is already used for NPUSCH scheduling, to also carry OCC index indication. This multi-functional use of the DCI structure avoids introducing entirely new signaling mechanisms, thereby improving uplink capacity while minimizing additional communication structure complexity.
Solution Approach 2:
The patent combines the OCC configuration and indication functions within the existing DCI framework. By merging the OCC index indication into the NPUSCH scheduling DCI, the system achieves enhanced uplink capacity without requiring separate dedicated signaling structures.
3Adaptability or versatility
If dynamic OCC index indication is implemented, then flexibility is improved, but DCI format complexity increases
Solution Approach 1:
The patent indicates the OCC index using only the necessary number of bits within the DCI format, rather than allocating full resources. This partial action approach provides dynamic flexibility for OCC selection while avoiding excessive complexity in the DCI structure by using only the minimum required indication mechanism.
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 configurations on orthogonal cover code (OCC) multiplexing support and OCC multiplexing factor for narrowband internet of things (NB-IoT) narrowband physical uplink shared channel (NPUSCH) in a higher layer signaling. The receiving circuitry is also 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 and to receive a DCI format N0 for a NPUSCH transmission with an OCC index indication. The UE also includes transmitting circuitry configured to transmit an NPUSCH with OCC multiplexing with the provided OCC multiplexing factor and the indicated OCC index on a schedule resource.