SSB Frequency Allocation Using UE Feedback for Higher SINR
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Solution Overview
Problem
In wireless communication systems, particularly in 5G NR, the allocation of synchronization signal blocks (SSBs) on weak subcarriers can lead to significant frequency power variations, affecting the UE's ability to connect and maintain synchronization, thereby degrading tracking loop performance and throughput.
Innovation Solution
The network node selects SSB frequencies based on information received from UEs, such as preferred frequencies and signal measurements, to improve the SSB signal-to-interference-and-noise ratio (SINR) and minimize power variation across subcarriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SSB is allocated on weak subcarriers, then frequency power variations occur, but UE tracking loop performance degrades
Solution Approach 1:
The network node receives feedback from the UE including measured SINR values and preferred frequency indications. This feedback mechanism allows the network to identify which frequencies provide better tracking performance and allocate SSB accordingly, resolving the contradiction between maintaining reliability and avoiding harmful frequency power variations.
Solution Approach 2:
The patent changes the frequency parameter of SSB allocation based on UE feedback. Instead of using fixed or predetermined frequencies, the system dynamically adjusts the frequency selection to match UE preferences and measured SINR conditions, thereby improving tracking loop performance while minimizing frequency power variations.
2Reliability
If network node selects SSB frequency without UE feedback, then allocation is simple, but tracking performance is suboptimal
Solution Approach 1:
The UE performs preliminary measurements and preparations by measuring SINR on multiple frequencies and preparing preferred frequency indications before the network node makes the final allocation decision. This preliminary action by the UE simplifies the network node's task while ensuring optimal tracking performance.
Solution Approach 2:
The UE provides feedback containing measured SINR values and preferred frequency indications to the network node. This feedback mechanism enables the network to make informed frequency allocation decisions that optimize tracking performance without requiring complex network-side measurements or calculations.
3Reliability
If SSB frequency is fixed, then system complexity is reduced, but SINR performance varies
Solution Approach 1:
The SSB frequency allocation transitions from a static fixed assignment to a dynamic selection process based on UE feedback and measured SINR conditions. The network node dynamically adjusts frequency allocation to match varying channel conditions and UE preferences, maintaining high SINR performance while managing complexity through feedback-driven decision making.
Data Source
AI summary
Aspects described herein relate to transmitting one or more parameters related to selecting, by a network node, a frequency for transmitting a synchronization signal block (SSB), and receiving, based on transmitting the one or more parameters, the SSB from the network node over the frequency. Other aspects relate to receiving the one or more parameters and selecting he frequency for transmitting the SSB based on the one or more parameters.