Wireless Signal Transmission Symbol Alignment
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Solution Overview
Problem
In new radio (NR) systems, the misalignment of frame structures due to different subcarrier spacing parameters leads to interference between uplink and downlink signals, particularly at higher frequency bands, affecting the coverage area and system stability.
Innovation Solution
The method involves cascading consecutive symbols into symbol cascade blocks based on a proportional relationship, ensuring that symbols with different configurations are aligned within the same time length, and transmitting these blocks in a preset order to maintain system stability and avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different subcarrier spacing parameters are used for different services and frequency bands, then the system can adapt to various carrier frequencies and service requirements, but frame structure misalignment occurs leading to uplink-downlink interference
Solution Approach 1:
The frame structure is segmented into multiple slots, with each slot containing a configurable number of symbols. This segmentation allows different subcarrier spacing configurations to be applied to different slots or symbol groups, enabling adaptability to various services while maintaining alignment boundaries that prevent uplink-downlink interference.
Solution Approach 2:
The patent introduces dynamic configuration of frame structure parameters including subcarrier spacing, slot length, and symbol count. The system can dynamically adjust these parameters based on service type (eMBB, URLLC, mMTC) and frequency band, while maintaining alignment through configurable parameters that ensure synchronized uplink-downlink transitions across different configurations.
2Reliability
If subcarrier spacing is increased for high frequency bands, then phase noise resistance improves, but coverage area decreases due to higher propagation loss
Solution Approach 1:
The patent employs parameter changes by allowing flexible configuration of subcarrier spacing (e.g., 15kHz, 30kHz, 60kHz, 120kHz) based on frequency band and service requirements. This enables the system to use larger subcarrier spacing for high frequency bands to resist phase noise while compensating for coverage limitations through other means such as beamforming or repeaters.
3Adaptability or versatility
If frame structure parameters are scaled for different subcarrier spacings, then the system can support multiple frequency bands, but symbol misalignment occurs at boundaries causing interference
Solution Approach 1:
The patent introduces configurable frame structure parameters (slot length, symbol count, cyclic prefix length) as intermediaries that mediate between different subcarrier spacing configurations. These parameters act as alignment mechanisms that ensure symbol boundaries coincide across different frequency bands and subcarrier spacing values, preventing boundary interference while maintaining support for multiple frequency bands.
Data Source
AI summary
Provided in embodiments of the present disclosure is a wireless signal transmission method and device. The method includes: in presence of a plurality of sets of wireless signals having different configurations, cascading consecutive symbols in each of the plurality of sets of wireless signals into at least one symbol cascade block, where when lengths of valid symbols in any two sets of wireless signals of the plurality of sets of wireless signals having different configurations satisfy a proportional relationship of n:m, numbers of symbols in symbol cascade blocks of the two sets of wireless signals within a same time length satisfy a proportional relationship of m:n, and n and m are positive integers; and transmitting symbol cascade blocks of the plurality of sets of wireless signals in a preset order.