SRS Resource Allocation for Inter-Cell Interference Reduction
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Solution Overview
Problem
In wireless communication systems, severe inter-cell SRS interference leads to inaccurate channel quality measurements, affecting beamforming performance, uplink and downlink scheduling, and multi-user pairing accuracy due to overlapping signals in different cells.
Innovation Solution
A method for allocating non-overlapping transmission resources for SRSs in different cells using time, frequency, carrier, and code domains, along with dynamic adjustments based on cell quantities and service requirements, to reduce interference and improve channel state information acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SRS transmission resources are allocated in a conventional manner without cell-specific differentiation, then resource allocation is simple, but severe inter-cell interference occurs leading to inaccurate channel quality measurements
Solution Approach 1:
The patent applies local quality by differentiating SRS resource allocation based on cell-specific characteristics. Each cell is assigned a cell identifier (PCI) that determines its specific time-frequency resource allocation pattern. This ensures that cells with different PCIs transmit SRS in different time slots and frequency resources, thereby reducing inter-cell interference while maintaining measurement accuracy. The solution balances complexity by using a systematic allocation rule based on PCI rather than requiring complex manual configuration.
Solution Approach 2:
The patent segments the SRS transmission resources into cell-specific time-frequency slots based on cell identifiers. By dividing the overall resource space into distinct segments assigned to different cells, the system prevents overlapping SRS transmissions between adjacent cells. This segmentation approach resolves the interference problem while maintaining manageable complexity through automated resource mapping based on cell IDs.
2Productivity
If transmission resources are allocated to accommodate more cells and users, then system capacity increases, but inter-cell SRS interference worsens
Solution Approach 1:
The patent resolves the interference-capacity contradiction by utilizing the time and frequency dimensions in a systematic way. By mapping cell identifiers to specific time slots and frequency resources, the system creates a three-dimensional resource allocation structure (time-frequency-cell). This dimensional approach allows multiple cells to be accommodated without interference by orthogonally distributing them across time-frequency space, thereby increasing system capacity while maintaining measurement accuracy.
Solution Approach 2:
The patent employs a replicable allocation pattern where each cell receives a copy of the standard SRS resource allocation template, adjusted according to its cell identifier. This copying approach allows the system to scale to many cells by simply applying the same rule set with different PCI values, thereby increasing capacity without proportionally increasing interference management complexity.
3Adaptability or versatility
If dynamic resource allocation based on service requirements is implemented, then adaptability to changing demands improves, but resource allocation complexity increases
Solution Approach 1:
The patent implements dynamics by enabling flexible SRS resource allocation that can adapt to changing service requirements. The system can dynamically adjust the time-frequency resources assigned to cells based on current traffic conditions and service demands. This dynamic capability allows the network to optimize measurement accuracy under varying load conditions while managing complexity through automated adjustment mechanisms that respond to network state changes without requiring manual reconfiguration.
Data Source
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AI summary
Embodiments of this application disclose a method for obtaining channel state information, an apparatus, and a computer storage medium. Transmission resources for transmitting SRSs in different cells do not overlap at all or partially overlap, thereby ensuring that the transmission resources allocated by a network device to the different cells are staggered as much as possible. Therefore, SRS interference between the cells can be reduced, and cell performance can be improved.