Secondary Synchronization Signal Location Encoding for Symbol Identification
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Solution Overview
Problem
Current wireless communication systems, particularly in LTE and 5G technologies, face challenges in efficiently conveying additional information using synchronization signals, such as secondary synchronization signals (SSS), especially in millimeter wave (mmW) communications where beamforming is used, leading to difficulties for user equipment (UEs) to distinguish the symbol in which the signals are received.
Innovation Solution
The method involves selecting frequency resources for transmitting synchronization signals based on a mapping to the location of the symbol within a frame, allowing UEs to determine the symbol number and synchronize with the base station (BS) using location encoding techniques, which include mapping specific subcarriers to indicate the symbol number, enabling UEs to identify the correct symbol through blind decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronization signals are transmitted using beamforming across multiple symbols, then coverage and signal strength are improved, but the ability of UEs to distinguish the symbol number deteriorates
Solution Approach 1:
The synchronization signal transmission is segmented across multiple symbols with each symbol using a distinct frequency resource pattern. This segmentation allows UEs to identify which specific symbol they are receiving while still benefiting from the coverage enhancement of transmitting across multiple symbols through beamforming.
Solution Approach 2:
The patent introduces frequency resources as an additional dimension for encoding symbol number information. Instead of relying solely on time-domain symbol positions, the system maps different frequency resource patterns to different symbol numbers, allowing UEs to decode symbol identity from the frequency domain while maintaining the multi-symbol beamforming transmission structure.
2Measurement precision
If frequency resources are mapped to symbol locations for location encoding, then symbol identification accuracy is improved, but the complexity of resource allocation increases
Solution Approach 1:
The patent changes the parameters of frequency resource allocation dynamically based on symbol location. Each symbol is assigned a specific frequency resource pattern, creating a systematic parameter change that enables precise symbol identification while maintaining manageable complexity through structured resource mapping rules.
Data Source
AI summary
Aspects of the present disclosure relate to methods and apparatus for location encoding for secondary synchronization signals (SSS) to convey additional information, such as a current symbol number. According to aspects, a method is provided herein for wireless communications that may be performed, for example, by a base station (BS). The method generally includes selecting frequency resources to use for transmitting synchronization signals in a symbol of a frame, wherein the frequency resources are selected based on a mapping of frequency resources to a location of the symbol within the frame; and transmitting synchronization signals to at least one user equipment (UE) according to the mapping. As a result, the UE may receive synchronization signals, determine a location of the current symbol in a frame based on the mapping, and synchronize to the BS based on the determined location of the current symbol. Numerous other aspects are provided.