PUSCH Symbol Staggering for Remote Interference Suppression
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Solution Overview
Problem
Remote interference occurs in LTE and 5G systems due to downlink signals from interfering base stations being received in uplink slots of interfered base stations, causing interference and affecting user access, particularly in long-distance transmissions with different uplink/downlink configurations.
Innovation Solution
A network device determines interfered uplink symbols and configures alternative symbols for physical uplink shared channel (PUSCH) transmission, using type B mapping to stagger symbol locations and perform zero-forcing processing to suppress interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If downlink transmission is performed in TDD systems, then communication coverage is extended, but remote interference occurs in uplink slots due to signal propagation
Solution Approach 1:
The patent segments the uplink slot by identifying and isolating interfered symbols from non-interfered symbols. By determining which specific symbols are affected by remote interference and configuring PUSCH transmission only on non-interfered symbols, the system separates useful signal transmission from interference-prone time resources, thereby extending transmission distance while mitigating interference impact.
Solution Approach 2:
The patent dynamically adapts PUSCH symbol configuration based on detected remote interference conditions. The network device determines interfered symbols in real-time and adjusts the PUSCH time-domain resource assignment accordingly, selecting from different mapping types (type A or type B) and start symbol positions based on current interference patterns, thus maintaining communication coverage while avoiding interference dynamically.
2Device complexity
If PUSCH transmission uses fixed mapping type, then device complexity is reduced, but flexibility to avoid interfered symbols is limited
Solution Approach 1:
The patent changes the parameters of PUSCH configuration by introducing dynamic selection between mapping type A and mapping type B, and by adjusting the start symbol position based on interference conditions. The network device configures different time-domain resource assignments (different K0, K1, K2 values, start symbols, and lengths) according to detected remote interference, thereby achieving flexibility without significantly increasing device complexity through standardized parameter sets.
3Productivity
If all uplink symbols are used for PUSCH transmission, then productivity is maximized, but interference from remote downlink signals degrades signal quality
Solution Approach 1:
The patent extracts and removes interfered symbols from the PUSCH transmission resource set. By identifying symbols contaminated by remote downlink interference and excluding them from PUSCH allocation, the system transmits PUSCH only on clean non-interfered symbols, thereby maintaining transmission efficiency while ensuring signal demodulation quality through selective resource extraction.
Solution Approach 2:
The patent introduces an intermediary mechanism (the network device's interference detection and resource configuration function) that mediates between the desire to use all uplink symbols for transmission and the need to avoid interfered symbols. This intermediary determines which symbols are suitable for PUSCH transmission based on remote interference detection, balancing productivity and reliability through intelligent resource allocation.
Data Source
AI summary
This application provides a remote interference suppression method and apparatus and a device, and is applied to the communications field, to stagger a symbol location of an interfered uplink symbol, thereby reducing impact of remote interference. In addition, zero-forcing processing is performed in a direction indicated by Q pieces of phase information corresponding to the caused remote interference, to make a signal approximate 0 to suppress the remote interference, thereby reducing the impact of the remote interference. The method includes: a first network device determines that N uplink symbols are interfered with, and then configures, by using a first mapping type of a physical uplink shared channel (PUSCH), one or more symbols other than the N uplink symbols for uplink PUSCH transmission.