Terminal Reference Signals to Measure Cross-Link Interference
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Solution Overview
Problem
Existing wireless communication systems fail to effectively measure and mitigate cross-link interference between terminals in full-duplex transmission, as the base station cannot obtain measurement results of cross-link interference between terminals, leading to residual self-interference and link transmission loss.
Innovation Solution
A data transmission method where a terminal transmits a reference signal before or at the start of data transmission, allowing another terminal to measure cross-link interference and determine if data transmission should proceed based on the interference magnitude, thereby resolving cross-link interference issues in full-duplex systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex transmission is implemented to improve spectral efficiency and data rates, then productivity increases, but cross-link interference between terminals occurs causing loss of information and reduced reliability
Solution Approach 1:
The patent applies preliminary action by having terminals transmit reference signals before actual data transmission begins. This allows receiving terminals to measure cross-link interference levels in advance, determine whether interference exceeds thresholds, and make informed decisions about whether to proceed with data transmission. The reference signal transmission occurs in a preliminary phase (e.g., in guard periods or before uplink slots), enabling proactive interference assessment rather than reactive mitigation.
Solution Approach 2:
The patent implements feedback mechanisms where terminals measure reference signals, determine interference magnitudes, and report these measurements back to the network (base station). The base station uses this feedback information to make scheduling decisions, adjust power levels, or coordinate transmissions to avoid high-interference scenarios. This closed-loop feedback system enables dynamic adaptation to cross-link interference conditions while maintaining full-duplex operation.
2Productivity
If full-duplex transmission is implemented to improve spectral efficiency, then productivity increases, but residual self-interference causes link transmission loss
Solution Approach 1:
The patent enables preliminary interference measurement and assessment before data transmission occurs. By transmitting reference signals in advance and measuring cross-link interference levels, terminals can identify high-interference time-frequency resources and avoid or mitigate transmissions on those resources, thereby protecting link quality before degradation occurs.
Solution Approach 2:
The patent establishes feedback loops where interference measurements are reported to the base station, which then adjusts scheduling, power control, or resource allocation decisions. This feedback mechanism allows the system to adapt to changing interference conditions and maintain reliable link transmission quality despite full-duplex operation.
3Measurement precision
If reference signal transmission is added to measure cross-link interference, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent makes existing reference signals (such as demodulation reference signals or synchronization signals) serve dual purposes: their traditional function for channel estimation/synchronization plus an additional function for cross-link interference measurement. This multi-functionality approach enables interference measurement without adding entirely new signal types, thereby improving measurement precision while minimizing increases in device complexity.
Solution Approach 2:
The patent enables terminals to autonomously perform interference measurement and evaluation using their own received reference signals. Terminals self-assess cross-link interference conditions without requiring complex external measurement infrastructure, making the measurement process efficient and minimizing additional complexity while achieving precise interference characterization.
Data Source
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AI summary
There is provided a power headroom report method, a configuring method, a power control method, a data transmission method, a terminal, a base station and an apparatus of the same. The data transmission method may include: acquiring configuration information for uplink or downlink data transmission; determining whether a front loaded reference signal is transmitted according to the acquired configuration information; in response to determining that the reference signal is transmitted, transmitting the reference signal before the data transmission or at the same time when the data transmission starts and performing uplink data transmission or downlink data reception; and in response to determining that the reference signal is not transmitted, directly performing the uplink data transmission or the downlink data reception.