Split Symbol Control for Aligned Numerology in Wireless Subframes
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Solution Overview
Problem
Wireless communication systems face inefficiencies due to fixed tone spacing across different spectrum bands, leading to intersymbol interference and signal reception issues, particularly in systems like LTE and mmW, where varying tone spacings are needed to mitigate phase noise and orthogonality blurring.
Innovation Solution
Implementing split symbol control for aligned numerology, where tone spacing and symbol duration can vary within a subframe based on the spectrum band and UE capabilities, allowing multiple control symbols to be transmitted at different locations and durations, optimizing communication efficiency across various frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed tone spacing is used across different spectrum bands, then system simplicity is maintained, but intersymbol interference and signal reception issues occur
Solution Approach 1:
The patent implements dynamic tone spacing where the base station configures different tone spacings for different UEs based on their capabilities and the spectrum band being used. This allows the system to adapt tone spacing dynamically rather than using a fixed value, resolving the contradiction between system simplicity and signal reception reliability.
Solution Approach 2:
The patent changes the tone spacing parameter based on spectrum band and UE capabilities. Specifically, it allows for varying subcarrier spacing (e.g., 15 kHz for LTE, 30 kHz or 60 kHz for mmW) to optimize performance in different frequency ranges, thereby improving signal reception while managing system complexity through standardized parameter sets.
2Reliability
If varying tone spacings are implemented for different spectrum bands, then signal reception is improved, but system complexity increases
Solution Approach 1:
The patent applies local quality by configuring tone spacing specifically for each UE based on its capabilities and the particular spectrum band it is using. Rather than changing the entire system's tone spacing configuration, only the relevant local configurations are adjusted, minimizing overall system complexity while improving signal reception where needed.
Solution Approach 2:
The patent segments the tone spacing configuration into different sets for different spectrum bands and UE types. This allows independent optimization of tone spacing for LTE bands versus mmW bands, and for different UE capabilities, without requiring complete system reconfiguration, thus managing complexity while improving reliability.
3Productivity
If multiple control symbols are transmitted at different locations within a subframe, then communication efficiency is improved, but scheduling complexity increases
Solution Approach 1:
The patent uses preliminary action by transmitting multiple control symbols at different locations within a subframe before the actual data transmission. This allows UEs to receive and process control information (such as scheduling assignments) in advance, improving communication efficiency by enabling earlier preparation and reducing latency, while the scheduling complexity is managed through predefined control symbol positions.
Data Source
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Figure 3A~3B
AI summary
Methods, systems, and devices for wireless communication provide for split symbol control by varying tone spacing and symbol duration for control channels in a subframe. The control symbols may be transmitted at various locations within the subframe and may be transmitted to different mobile devices. In some examples, multiple control symbols may be transmitted in a subframe to multiple mobile devices depending on the capabilities of each of the multiple mobile devices.