Antenna Port Signaling for OCC-Based Uplink Interference Reduction
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Solution Overview
Problem
Wireless communications systems face challenges in managing interference and resource efficiency when multiple devices communicate using non-orthogonal multiple access schemes, leading to difficulties in decoding and increased signaling overhead.
Innovation Solution
A method is introduced where a network entity indicates orthogonal cover code (OCC) parameters to devices through an antenna port field in downlink control information, allowing devices to apply OCC for uplink transmissions, thereby reducing interference and optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If non-orthogonal multiple access schemes are used to allow multiple devices to communicate on the same time-frequency resources, then resource efficiency is improved, but interference management and decoding difficulty increase
Solution Approach 1:
The patent introduces an intermediary signaling mechanism (downlink control information with antenna port field) that mediates between the non-orthogonal multiple access transmissions and the receivers. This intermediary provides explicit orthogonal cover code configuration information that facilitates decoding while maintaining the resource efficiency benefits of non-orthogonal access.
2Reliability
If explicit OCC configuration signaling is implemented to reduce decoding difficulty, then decoding reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent makes the existing antenna port field in downlink control information multi-functional by having it indicate both antenna port information and orthogonal cover code configuration. This universal usage of the field provides explicit OCC configuration for reliable decoding without adding separate dedicated signaling and thus avoiding increased signaling overhead.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for indicating orthogonal cover code (OCC) configurations via an antenna port field indication. A method generally includes receiving a downlink message that schedules an uplink message, where the downlink message includes an antenna port field; and sending the uplink message based on an OCC configuration that corresponds to the antenna port field. In some aspects, the antenna port field may indicate an entry within a table, where the table includes a plurality of OCC configurations (e.g., and/or at least one non-OCC configuration), and each OCC configuration of the plurality of OCC configurations may be associated with a respective value for the antenna port field.