Communication Pattern Signaling for Cross-Link Interference Estimation
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately estimating cross-link interference (CLI) channels between base stations, which can degrade the quality of uplink communications in full duplex scenarios due to interference from downlink transmissions.
Innovation Solution
A method and apparatus for estimating CLI channels by adjusting transmission parameters, such as reducing transmit power, muting, or applying timing advance, based on communication patterns indicated by a base station, allowing for improved reception of uplink communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full duplex communication is used to increase spectral efficiency, then system capacity is improved, but interference between uplink and downlink channels increases
Solution Approach 1:
A CLI estimation mechanism is introduced as an intermediary to measure and characterize the interference channel between base stations. The gNB configures UE to transmit SRS signals during specific communication patterns, enabling the receiving gNB to estimate the cross-link interference channel and use this information for interference mitigation in full duplex operations
Solution Approach 2:
The system dynamically adjusts communication parameters including transmit power levels, timing advance values, and resource allocation patterns based on estimated CLI conditions. The gNB configures different communication patterns that modify transmission parameters to optimize performance under varying interference conditions while maintaining full duplex operation
2Measurement precision
If CLI channel estimation is performed during uplink transmission resources, then interference measurement is enabled, but uplink communication quality degrades
Solution Approach 1:
The system segments time-frequency resources into distinct portions: some resources are allocated for normal uplink communication while other resources are designated for CLI estimation. The gNB configures specific communication patterns that divide available resources, allowing simultaneous or alternating operation of data transmission and interference measurement without mutual degradation
Solution Approach 2:
The system performs preliminary CLI channel estimation using SRS transmissions before actual uplink data transmission. By estimating the interference channel in advance during configured communication patterns, the gNB can prepare interference mitigation strategies that protect subsequent uplink communication quality while maintaining accurate CLI measurement
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a message indicating one or more communication patterns from a base station. The one or more communication patterns may indicate to the UE to adjust one or more parameters for transmitting an uplink communication during a set of time resources, a set of beams, a set of ports, or any combination thereof. During the resources indicated in the one or more communication patterns, the base station may estimate a cross link interference channel between the base station and a second base station. The one or more communication patterns may indicate a hopping pattern for each subband of a bandwidth part. The base station may configure the UE with a timing advance based on the message.