Reference Signal Configuration for Full Duplex Interference Mitigation
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Solution Overview
Problem
Full duplex (FD) implementations in TDD communication systems face interference issues such as base station to base station (inter-gNB) cross link interference, base station self-interference, and UE to UE (inter-UE) cross link interference, which are difficult to address.
Innovation Solution
The method involves configuring user equipment (UE) and access network nodes to manage interference by receiving and transmitting reference signals based on different configurations for different communication schemes, segregating antenna elements between uplink and downlink, and using intelligent beam scheduling to reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full duplex operation is implemented in TDD carriers, then spectral efficiency and system capacity are improved, but interference such as base station to base station cross link interference, base station self-interference and UE to UE cross link interference is generated
Solution Approach 1:
The patent segments the frequency domain by configuring different subbands for downlink and uplink transmissions within the same time slot. The access network node divides the available bandwidth into first subbands for downlink and second subbands for uplink, preventing frequency collision and reducing cross-link interference between base stations and UEs while maintaining full duplex operation.
Solution Approach 2:
The patent applies different transmission configurations to different spatial and frequency regions. Each subband is configured with specific downlink or uplink characteristics, and the system dynamically adjusts transmission parameters based on local interference conditions, allowing optimized performance in each region while managing overall interference.
2Measurement precision
If reference signal transmission configurations are increased to support multiple communication schemes, then measurement accuracy is improved, but signaling overhead and system complexity are increased
Solution Approach 1:
The patent designs a unified reference signal transmission mechanism that serves multiple communication schemes (first and second communication schemes) through a single configurable framework. The access network node transmits reference signals with configurations that can be interpreted by UEs for different schemes, eliminating the need for separate reference signal sets and reducing overall system complexity.
Solution Approach 2:
The system incorporates feedback mechanisms where UEs report measurement results of reference signals, and the access network node adjusts configurations based on this feedback. This enables dynamic optimization of reference signal transmission parameters to maintain measurement accuracy while adapting to changing network conditions and reducing overhead.
Data Source
AI summary
In a first example aspect, a method performed by a user equipment (UE) includes: receiving, from an access network node: first information indicating a first configuration related to transmission of a reference signal in a first time resource configured for a non-subband full duplex (SBFD), and second information indicating a second configuration related to transmission of a reference signal in a second time resource configured for aSBFD; and performing measurement of a reference signal transmitted in a time resource based on: the first information, the second information, and third information indicating whether a respective time resource is valid for transmitting the reference signal.