Synchronized Spectrum Sharing Across Adjacent Carriers
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in spectrum sharing between adjacent network operating entities due to restrictive aligned TDD configurations and large guard bands, leading to significant spectrum inefficiency and interference issues.
Innovation Solution
Implementing a priority-based spectrum access mechanism that allows nodes to perform listen-before-talk (LBT) across multiple operators sharing adjacent channels, with nodes monitoring request-to-transmit (RTS) and clear-to-transmit (CTS) signals to dynamically adjust transmission periods and bandwidths, reducing the need for large guard bands and aligned TDD configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If large guard bands are used to protect against interference from adjacent channels, then interference protection is improved, but spectrum efficiency deteriorates
Solution Approach 1:
The patent implements dynamic guard band adjustment where the size of guard bands is not fixed but adapts based on real-time channel conditions and LBT outcomes. Nodes can dynamically reduce or eliminate guard bands when adjacent channels are clear, and expand them when interference is detected, resolving the contradiction between interference protection and spectrum efficiency
Solution Approach 2:
The patent changes the parameter of guard band size from a static configuration to a dynamic variable that adjusts based on channel occupancy and interference levels. This allows the system to optimize the balance between protection and efficiency by modifying guard band parameters in response to changing spectral conditions
2Object-affected harmful factors
If aligned TDD configurations are enforced across adjacent channels, then interference management is improved, but spectrum flexibility deteriorates
Solution Approach 1:
The patent enables dynamic TDD configuration where uplink/downlink directions can be independently adjusted on each channel based on traffic demands and interference conditions. This dynamic approach replaces rigid aligned configurations, allowing each operator to optimize their TDD pattern while the LBT mechanism manages interference in real-time
Solution Approach 2:
The patent performs preliminary LBT sensing and coordination before actual data transmission begins. By determining channel availability and interference conditions in advance, nodes can pre-coordinate their TDD configurations and guard band settings, enabling flexible spectrum usage while maintaining interference management
3Object-affected harmful factors
If LBT is performed on every channel before transmission, then interference avoidance is improved, but access delay increases
Solution Approach 1:
The patent implements partial LBT where nodes perform sensing on a subset of channels or use cached channel state information rather than performing full LBT on every channel before each transmission. This selective approach reduces the time overhead while maintaining adequate interference avoidance through targeted sensing
Solution Approach 2:
The patent performs LBT sensing and channel assessment in advance and caches the results for subsequent transmissions. By preparing channel access information beforehand and reusing it when conditions remain valid, the system reduces repeated sensing overhead and minimizes access delay while maintaining interference avoidance
Data Source
AI summary
Wireless communications systems and methods related to communicating in a frequency band across multiple adjacent carriers are provided. A first wireless communication device performs first sensing in a first sensing time designated for a first channel, the first channel being an operational channel of the first wireless communication device. The first wireless communication device performs second sensing in a second sensing time designated for a second channel adjacent to the first channel, the second channel being an operational channel of a second wireless communication device. The first wireless communication device communicates with a third wireless communication device in the first channel a communication signal in the first channel based on the first sensing and the second sensing.