Cell ID-Based Reference Signal Mapping for Wireless Interference Mitigation
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Solution Overview
Problem
In wireless communication systems, as the number of reference signals increases, conventional codes may not be sufficient to distinguish each signal, leading to noise and interference issues, particularly in multi-antenna systems, where concurrent transmissions exacerbate interference problems, affecting reception quality and throughput.
Innovation Solution
A scalable coding scheme is introduced where dedicated reference signals are mapped to wireless channel resources based on a cell ID, using a data processor to generate and allocate sequences, allowing for efficient noise randomization and interference mitigation by employing cell-specific or virtual cell IDs for multi-antenna systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of reference signals is increased to support more terminals and services, then the system capacity and service diversity are improved, but the available conventional codes become insufficient to distinguish each signal, leading to increased noise and interference
Solution Approach 1:
The patent changes the parameter used for code allocation from conventional fixed codes to cell ID-based dynamic codes. By mapping reference signals to codes derived from cell IDs, the system can support an unlimited number of reference signals without being constrained by a fixed codebook size, thereby resolving the contradiction between system capacity and noise/interference
Solution Approach 2:
The patent introduces dynamic code allocation where codes are generated on-demand based on cell IDs rather than using static pre-defined codes. This dynamic approach allows the system to adapt to varying numbers of reference signals and terminals, enabling scalable system capacity while maintaining signal distinguishability through cell-specific code generation
2Ease of manufacture
If conventional fixed codes are used for reference signals, then the implementation is simple, but the system cannot support a large number of reference signals and new coding schemes are restrictive for legacy terminals
Solution Approach 1:
The patent creates a universal coding mechanism based on cell IDs that can serve multiple functions: supporting legacy terminals through familiar code structures, enabling new coding schemes for advanced terminals, and accommodating any number of reference signals. The cell ID-based approach provides a unified framework that works across different terminal types and system configurations
Solution Approach 2:
The patent transitions from a one-dimensional fixed codebook approach to a multi-dimensional dynamic code generation system where codes are derived from cell IDs, terminal IDs, and signal types. This dimensional expansion allows the system to generate sufficient unique codes for any number of reference signals while maintaining backward compatibility with legacy terminals
3Productivity
If multiple reference signals are transmitted concurrently in multi-antenna systems, then the system throughput is improved, but interference between reference signals increases, affecting reception quality
Solution Approach 1:
The patent applies local quality by assigning cell-specific codes to reference signals transmitted from different cells and antennas. Each cell ID generates unique codes for its reference signals, creating localized code spaces that minimize interference between concurrent transmissions from different sources while allowing high system throughput through coordinated multi-antenna operation
Data Source
AI summary
Providing a coding scheme for wireless communication downlink reference signals is described herein. By way of example, a dedicated reference signal is mapped to resources of a wireless channel as a function of an identifier (ID) of a cell in which the reference signal is transmitted. The function can be similar to mapping functions employed for common reference signals, or can be distinct from such functions. As one example of the latter, a dedicated reference signal mapping function can be shifted in time or frequency with respect to the common reference signal mapping function. By employing a mapping function based on cell ID, noise caused by concurrent transmission of reference signals can be mitigated in a manner readily determined by terminals in a wireless network.