Non-orthogonal feedback sequence multiplexing for wireless resource efficiency
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in resource usage for feedback multiplexing, particularly in supporting multiple user equipments (UEs) with limited retransmissions and resource blocks.
Innovation Solution
The implementation of a method where a wireless device transmits data messages to multiple UEs, and each UE selects a feedback sequence from a pool that includes orthogonal and non-orthogonal sequences for acknowledgement and negative acknowledgement feedback, allowing for shared time and frequency resources for feedback transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If orthogonal sequences are used for feedback multiplexing, then feedback reliability is improved, but the number of resource blocks required increases
Solution Approach 1:
The patent changes the orthogonality parameter of feedback sequences from orthogonal to non-orthogonal, allowing multiple UEs to share the same time-frequency resources. This parameter change reduces resource block requirements while maintaining acceptable feedback reliability through advanced signal processing techniques at the base station for separating non-orthogonal signals
2Productivity
If non-orthogonal sequences are used for feedback multiplexing, then resource availability is improved, but sequence selection complexity increases
Solution Approach 1:
The base station pre-configures and signals to UEs which non-orthogonal sequences can be used for feedback transmission. This preliminary action provides UEs with a predefined set of acceptable sequences, reducing the complexity of sequence selection at the UE while still enabling resource-efficient non-orthogonal multiplexing
3Productivity
If shared time and frequency resources are used for feedback from multiple UEs, then resource efficiency is improved, but interference between UEs increases
Solution Approach 1:
The patent applies local quality by assigning different non-orthogonal sequences with specific correlation properties to different UEs. Each UE uses a sequence tailored to its specific transmission conditions, allowing the base station to differentiate and separate signals from multiple UEs even when they share the same time-frequency resources, thus managing interference effectively
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. For instance, a wireless device (e.g., a user equipment (UE), a base station) may transmit a set of data messages to a set of UEs, the set of data messages including one or more data messages for each UE of the set of UEs. Each UE may select a respective sequence representing feedback associated with the one or more data messages, the sequence being selected from a sequence pool that includes a first plurality of sequences representing acknowledgement feedback and a second plurality of sequences representing negative acknowledgement feedback, individual sequences of at least the second set of sequences being non-orthogonal to each other. Each UE may transmit the respective selected sequence to the wireless device via a shared set of time and frequency resources that are shared for feedback messages from the set of UEs.