PUSCH TBS Calculation With OCC and Sub-PRB Allocation
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Solution Overview
Problem
Existing wireless communication systems fail to account for orthogonal cover coding (OCC) spreading factors and sub-physical resource block (sub-PRB) allocations in transport block size (TBS) calculations for physical uplink shared channels, leading to inefficient frequency spectrum utilization and potential overvaluation of information bits.
Innovation Solution
Implementing methods and apparatuses that account for OCC spreading factors and sub-PRB allocations in TBS calculations by adjusting the quantity of information bits based on the spreading factor and sub-carrier allocations, using existing or reinterpreted DCI formats to indicate sub-PRB allocations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If OCC is applied to multiplex transmissions from multiple UEs, then the quantity of UEs supported increases, but the TBS calculation accuracy deteriorates due to spreading of information bits
Solution Approach 1:
The patent modifies the TBS calculation parameters by introducing a spreading factor (SF) that accounts for OCC. The TBS is calculated as TBS = (number of REs × coding rate × modulation order) / SF, where SF represents the spreading factor from OCC. This parameter change ensures accurate TBS calculation while maintaining support for multiple UEs.
2Productivity
If sub-PRB frequency allocation is implemented, then frequency spectrum efficiency improves, but DCI format complexity increases due to additional fields
Solution Approach 1:
The patent segments the PRB allocation into sub-PRBs, allowing finer-grained frequency allocation. The DCI format includes a frequency domain resource allocation field that can indicate sub-PRB allocations, enabling efficient frequency spectrum utilization while maintaining manageable format complexity through structured field definitions.
3Reliability
If OCC with spreading factor is applied, then multiple UEs can transmit orthogonally, but the quantity of information bits decreases due to bit spreading
Solution Approach 1:
The patent adjusts the TBS calculation to compensate for the spreading factor. By dividing the total information bits by the spreading factor (SF), the system maintains accurate bit accounting while enabling orthogonal multiplexing of multiple UEs. This ensures that the sum of information bits across all UEs equals the total available REs × coding rate × modulation order.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may account for the application of orthogonal cover coding (OCC) to an uplink transmission when determining the transport block size (TBS) for the uplink transmission. OCC may be used to multiplex transmissions from multiple UEs and may involve spreading information. Described techniques may involve accounting for the spreading of information bits when determining the TBS for the uplink transmission to which OCC is applied. Sub-physical resource block (sub-PRB) frequency allocations may be provided for uplink transmissions. The UE may account for the allocated quantity of sub-carriers when determining the quantity of information bits. To indicate a sub-PRB, the UE may be configured to reinterpret one or more fields of an existing downlink control information (DCI) format as indicating the allocated sub-carriers, or a new DCI format may be configured that includes fields for indicating a sub-PRB allocation.