5G Initial Acquisition Synchronization Signal Resource Mapping
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Solution Overview
Problem
Current beam acquisition techniques in cellular communication networks, particularly in mid-band and high-band spectra, face challenges such as increased complexity and power consumption in User Equipment (UE) for timing and frequency synchronization, and degraded performance due to high path loss and poor penetration of mmWave signals.
Innovation Solution
A resource mapping scheme for transmitting primary synchronization signals (PSS), secondary synchronization signals (SSS), and beamforming reference signals (BRS) is implemented, allowing UE to achieve symbol, subframe, and frame timing in one shot without additional baseband low pass filtering, reducing complexity and power consumption, and enabling coherent detection of SSS signals, while reducing the code space for BRS transmission to enhance detection probability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional beam acquisition techniques are used in mid-band and high-band spectra, then timing and frequency synchronization can be achieved, but UE complexity and power consumption increase
Solution Approach 1:
The patent combines PSS and SSS transmissions into the same OFDM symbols, allowing the UE to achieve symbol, subframe, and frame timing simultaneously. This merging eliminates the need for separate baseband low pass filtering operations, reducing UE complexity while maintaining synchronization reliability.
Solution Approach 2:
The synchronization signals serve multiple functions simultaneously: PSS provides frame timing and physical cell ID, SSS provides subframe timing and additional cell ID information, and both together enable frequency synchronization. This multi-functionality reduces the need for separate processing stages.
2Reliability
If traditional beam acquisition techniques are used in mid-band and high-band spectra, then timing and frequency synchronization can be achieved, but power consumption increases
Solution Approach 1:
By merging PSS and SSS transmissions in the same OFDM symbols, the UE performs synchronization operations in a single processing stage rather than multiple sequential stages. This eliminates redundant baseband low pass filtering operations, directly reducing power consumption.
Solution Approach 2:
The patent structures the synchronization signals so that timing information is available before detailed signal processing is required. This preliminary organization of timing data allows the UE to skip unnecessary processing steps, reducing energy expenditure.
3Measurement precision
If code space for BRS transmission is reduced, then detection probability improves, but signal transmission capacity decreases
Solution Approach 1:
The patent allocates specific resource elements for BRS transmission with optimized spacing and positioning. By carefully selecting the local quality and distribution of reference signal elements rather than uniformly distributing them, the detection probability is enhanced while minimizing the total code space required.
Data Source
AI summary
Disclosed herein are apparatuses, systems, and methods for reference signal design for initial acquisition, by receiving a first primary synchronization signal (PSS) and a first secondary synchronization signal (SSS) from a first transmit (Tx) beam, in first contiguous orthogonal frequency division multiplexing (OFDM) symbols of a downlink subframe. A UE can receive at least a second PSS and a second SSS from a second Tx beam in contiguous OFDM symbols of the downlink subframe. A UE can then detect beamforming reference signals (BRSs) corresponding to the first Tx beam and the second Tx beam, based on identification of physical cell ID information and timing information processed from the first PSS, the second PSS, the first SSS, and the second SSS. The UE can select the first Tx beam or the second Tx beam that was received with the highest power, based on the BRSs. Other embodiments are described.