Baseband Frequency Shifting for Efficient Passive Backscatter
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Solution Overview
Problem
Passive communications in wireless systems suffer from poor spectral efficiency and high communication resource overhead due to the inability of network entities to consider the frequency shift type of passive user equipment (UE) when allocating resources.
Innovation Solution
Passive UEs transmit an indication of supported baseband frequency shift types, enabling network entities to determine and adjust frequency domain resource allocations (FDRA) accordingly, allowing for frequency-shifted backscatter communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If passive UEs use traditional backscatter communications without frequency shift type indication, then the system is simple to operate, but spectral efficiency is poor and communication resource overhead is high
Solution Approach 1:
The patent implements a feedback mechanism where passive UEs transmit indications of their supported baseband frequency shift types to the network entity. This feedback enables the network entity to determine and allocate appropriate frequency domain resources (FDRA) based on the UE's capabilities, thereby improving spectral efficiency while managing resource overhead effectively
Solution Approach 2:
The patent introduces frequency shift type parameters (single-side or double-side frequency shift) that can be configured and indicated by passive UEs. By changing and optimizing these frequency domain parameters based on UE capabilities, the system achieves improved spectral efficiency without excessive resource overhead
2Reliability
If the network entity allocates frequency resources without considering baseband frequency shift type, then resource allocation is simple, but interference increases and network performance deteriorates
Solution Approach 1:
The patent implements preliminary action by having passive UEs transmit their baseband frequency shift type capabilities before actual resource allocation occurs. The network entity uses this advance information to determine and allocate appropriate frequency domain resources, preventing interference issues before they arise and improving network performance
Solution Approach 2:
The network entity changes its resource allocation parameters (FDRA) based on the indicated baseband frequency shift type of the passive UE. This parameter adaptation allows the system to optimize resource allocation for each UE's specific capabilities, reducing interference and improving reliability
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A passive user equipment (UE) may transmit an indication of a baseband frequency shift type supported by the passive UE for backscatter communications. The baseband frequency shift type may include one or both of a single-side frequency shift or a double-side frequency shift. A network entity may determine a frequency domain resource allocation (FDRA) for the passive UE based on receiving the indication. The network entity may transmit an indication of the FDRA to the passive UE. The FDRA may correspond to the baseband frequency shift type supported by the passive UE. The passive UE may transmit one or more backscatter communications based on the FDRA signaled by the network entity. The one or more backscatter communication s may be frequency shifted according to the baseband frequency shift type supported by the passive UE.