Full-Duplex Repeater Filtering for Self-Interference Mitigation
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Solution Overview
Problem
Existing wireless communications systems face challenges in managing self-interference and cross-link interference in full-duplex operations at repeater nodes, which affect communication reliability and efficiency.
Innovation Solution
Repeater nodes provide assistance information and configuration requests for full-duplex communications, including filtering capabilities, guard-bands, and multiplexing support, to mitigate interference and enhance network efficiency and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex operations are implemented at repeater nodes, then network throughput and communication efficiency are improved, but self-interference and cross-link interference increase
Solution Approach 1:
The bandwidth is segmented into multiple sub-bands, with different sub-bands allocated for uplink and downlink transmissions. This frequency division allows simultaneous full-duplex operations while reducing self-interference through spectral separation, enabling the repeater to handle both directions of communication with reduced interference
Solution Approach 2:
An interference mitigation mechanism acts as an intermediary between transmission and reception functions. The system uses assistance information exchange and configurable filtering as intermediary processes to manage and reduce self-interference and cross-link interference, enabling full-duplex operations to proceed with controlled interference levels
2Productivity
If full-duplex operations are implemented at repeater nodes, then network throughput and communication efficiency are improved, but cross-link interference increases
Solution Approach 1:
The spectrum is divided into multiple sub-bands with specific uplink and downlink allocations. This segmentation creates frequency separation between simultaneous transmissions, reducing cross-link interference between different user pairs while maintaining full-duplex operational capacity
Solution Approach 2:
The system dynamically adjusts parameters such as sub-band allocation, filter characteristics, and guard-band widths to optimize interference management. By changing these parameters based on channel conditions and traffic requirements, the system maintains high throughput while controlling cross-link interference levels
3Object-generated harmful factors
If filtering capabilities are used to reduce interference, then interference mitigation is improved, but device complexity increases
Solution Approach 1:
The repeater is designed with multi-functional capabilities that combine filtering, amplification, and signal processing in integrated units. This universal design reduces overall device complexity by consolidating multiple functions into single components while maintaining effective interference mitigation through coordinated operation of these integrated functions
Data Source
AI summary
Methods, systems, and devices for wireless communications are described in which a repeater may provide assistance information and configuration requests for full-duplex communications. The assistance information may include information about filtering capabilities of the repeater, such as sub-bands that can be filtered to avoid cross-link interference (CLI) or self-interference (SI), a width of a pass-band or transition band, a level of rejection associated with repeater filters, and the like. The assistance information may also indicate an amount of guard-band needed between uplink and downlink sub-bands, supported sub-bands, supported transmit power or amplification levels, phase continuity capabilities, transition times between full-duplex and non-full-duplex symbols, or any combinations thereof. Additionally, or alternatively, the assistance information may indicate support for multiplexing between mobile termination (MT) and forward (FWD) units at the repeater, and CLI measurements associated with MT and FWD unit multiplexing may be provided.