Orthogonal Cover Codes for Overlapping Uplink Resources
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing uplink transmissions from multiple user equipment (UEs) using overlapping time and frequency resources, leading to interference and reduced network throughput.
Innovation Solution
Implementing orthogonal cover codes (OCCs) for uplink transmissions, where UEs receive control signaling indicating OCC parameters and schemes, allowing them to transmit messages encoded with specific OCCs, enabling differentiation and reducing interference even with overlapping resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple UEs transmit uplink messages using overlapping time and frequency resources, then network capacity and resource utilization are improved, but interference between transmissions increases and message decoding reliability deteriorates
Solution Approach 1:
The patent segments the uplink transmission space by introducing orthogonal cover codes that divide the resource space into orthogonal segments. Each UE is assigned a unique OCC sequence that segments the overall transmission space, allowing multiple UEs to share overlapping time-frequency resources while maintaining distinguishable signal paths through code-based segmentation.
Solution Approach 2:
The patent changes the parameter space by introducing OCC sequences as an additional dimension for resource differentiation. Instead of relying solely on time and frequency parameters, the system modifies the code domain parameter by assigning different OCC sequences to different UEs, enabling reliable decoding despite overlapping time-frequency resources.
2Reliability
If orthogonal cover codes are introduced to differentiate multiple UEs' transmissions, then message decoding reliability is improved, but system complexity and overhead increase
Solution Approach 1:
The patent applies partial action by introducing OCC sequences selectively rather than universally. The network entity determines whether OCC-based differentiation is needed based on the transmission scenario, and only applies OCC sequences when beneficial. This partial application reduces overall system complexity while maintaining reliability improvements where needed.
Solution Approach 2:
The patent introduces the OCC sequence as an intermediary element that mediates between multiple UEs sharing overlapping resources. The OCC acts as a code-domain mediator that separates and identifies individual UE transmissions without requiring complex multi-user detection algorithms, thus reducing system complexity while improving reliability.
3Adaptability or versatility
If OCC parameters are dynamically indicated via control signaling, then adaptability to different transmission scenarios is improved, but control overhead and signaling complexity increase
Solution Approach 1:
The patent makes the control signaling universal by designing the OCC indication mechanism to serve multiple functions. The same control signaling structure is used both to indicate OCC parameters and to coordinate resource allocation, achieving multi-functionality that reduces overall signaling overhead while maintaining adaptability to different transmission scenarios.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A UE may transmit one or more uplink messages according to an orthogonal cover code (OCC) and an OCC scheme indicated by a network entity. The UE may receive control signaling scheduling one or more uplink messages for transmission. The control signaling may also indicate one or more OCC parameters for the one or more uplink messages. The UE may receive second control signaling that indicates that an OCC scheme for uplink messages is enabled. The control signaling may indicate a row within a time domain resource allocation (TDRA) table or a row within an OCC table. In either case, the row may correspond to the one or more OCC parameters. The UE may transmit the one or more uplink messages using an OCC in accordance with the one or more OCC parameters, the OCC scheme, or both.