Uplink OCC Resource Allocation Across Multiple Slots
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Solution Overview
Problem
Wireless communications systems face interference issues when multiplexing uplink communications of multiple user equipments (UEs), which can negatively impact throughput due to insufficient resource allocation for orthogonal cover coding (OCC) techniques, particularly in non-terrestrial networks where resources are scarce.
Innovation Solution
UEs inform the network entity of their capability to support OCC, and the network entity adheres to constraints when allocating uplink resources, ensuring a sufficient quantity of time units for each repetition of a transmission block to satisfy the OCC factor, thereby optimizing resource allocation for OCC with transport block over multiple slots (TBoMS) and resource units (RUs).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple UEs are multiplexed in uplink communications, then system capacity is improved, but interference increases and throughput deteriorates due to insufficient resource allocation for OCC
Solution Approach 1:
The patent segments the uplink resource allocation by introducing orthogonal cover coding (OCC) that divides the transmission space into orthogonal segments for different UEs. Each UE is assigned a specific OCC sequence (e.g., Walsh-Hadamard codes) that creates orthogonal separation, allowing multiple UEs to share the same time-frequency resources without interfering with each other. This segmentation resolves the contradiction by enabling higher system capacity while maintaining low interference levels through mathematical orthogonality.
Solution Approach 2:
The patent introduces OCC sequences as an intermediary layer between the physical signals of different UEs. These sequences act as mediators that encode user-specific information into the transmission, allowing the receiver to separate and decode individual UE signals from the multiplexed uplink. The OCC sequences transform the harmful interference problem into a manageable signal separation task through correlation-based detection, thereby improving throughput while maintaining high system capacity.
2Object-generated harmful factors
If OCC is applied to multiplexed UEs, then interference is reduced, but resource allocation complexity increases due to OCC factor constraints
Solution Approach 1:
The patent manages resource allocation complexity by systematically parameterizing the OCC factor and its relationship with the number of repetitions. The network entity configures OCC factors (e.g., OCC=2, 4, 8) that determine the spreading length, and these parameters are carefully selected to satisfy the constraint that the number of time units must be greater than or equal to the OCC factor. This parameter-based approach transforms the complex resource allocation problem into a structured configuration task with clear design rules, making it manageable while achieving interference reduction.
3Productivity
If resource units are allocated for TBoMS with OCC, then uplink throughput is improved, but the quantity of time units required increases
Solution Approach 1:
The patent introduces dynamic resource allocation where the quantity of time units is adaptively determined based on the OCC factor and the number of repetitions. The system dynamically adjusts the resource allocation to satisfy the constraint that time units ≥ OCC factor, optimizing the balance between throughput improvement and time consumption. This dynamic approach allows the system to achieve higher uplink throughput through OCC while minimizing the time unit overhead by selecting the smallest sufficient allocation that meets the orthogonality requirements.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive control signaling that indicates an orthogonal cover coding (OCC) codeword assigned to the UE and an OCC factor. The UE may receive an uplink grant that allocates, to the UE, uplink resources over a series of uplink time units for a quantity of repetitions of a transmission block. The UE may subsequently use the assigned OCC codeword to transmit each repetition of the quantity of repetitions of the transmission block over a quantity of uplink time units of the series of uplink time units, where a function of the quantity of uplink time units and the quantity of repetitions satisfies a threshold, and where the quantity of uplink time units is greater than or equal to the OCC factor.