SSB Detection and Candidate Set Processing for Unlicensed 5G Reception
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Solution Overview
Problem
In unlicensed 5G communications systems, the uncertainty of channel availability due to contention-based access leads to missed transmission opportunities, causing issues with normal reception of network-side signals and expected terminal behaviors, such as PDCCH monitoring and radio environment monitoring.
Innovation Solution
Implement SSB detection to determine a candidate SSB set quasi co-located with a detected first SSB, and perform processing based on this set, including receiving system information scheduled by a physical control channel associated with the SSB, or performing radio link monitoring and radio resource management measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clear channel assessment (CCA) or extended clear channel assessment (eCCA) is performed to monitor channels before transmission, then channel availability is improved, but transmission timing uncertainty increases causing missed transmission opportunities
Solution Approach 1:
The network side device performs clear channel assessment (CCA) or extended clear channel assessment (eCCA) in advance before the scheduled transmission time to determine channel availability. By conducting this assessment preliminarily and storing the result, the device can proceed with transmission at the predetermined time without waiting for last-minute channel checks, thus reducing transmission timing uncertainty while ensuring reliable channel availability.
2Productivity
If fixed slot monitoring is used for type 0 PDCCH based on configuration indexes, then monitoring efficiency is improved, but adaptability to channel availability uncertainty deteriorates
Solution Approach 1:
The terminal device dynamically adjusts its PDCCH monitoring behavior based on received indication information. When the indication shows the network side performed CCA/eCCA in advance, the terminal monitors PDCCH at fixed slots with high efficiency. When the indication shows no advance assessment was performed, the terminal adjusts monitoring timing and behavior accordingly. This dynamic adaptation maintains monitoring efficiency while being versatile enough to handle different channel availability scenarios.
3Adaptability or versatility
If contention-based access mode is used on unlicensed bands, then spectrum sharing capability is improved, but transmission opportunity uncertainty increases
Solution Approach 1:
The network side device sends indication information to the terminal device about whether CCA/eCCA was performed in advance and the channel availability status. This feedback mechanism allows the terminal to adjust its receiving and monitoring behavior accordingly. When feedback indicates reliable channel availability, the terminal proceeds with normal operations. When feedback indicates uncertainty, the terminal adjusts timing and monitoring, thus maintaining reliable transmission opportunities while preserving spectrum sharing capability through contention-based access.
Data Source
AI summary
This disclosure provides an information receiving method, an information sending method, a terminal, and a network-side device. The information receiving method includes: performing SSB detection; determining, based on transmission configuration information for first information, a candidate SSB set quasi co-located with a detected first SSB, where the first information includes an SSB; and performing first processing based on the first SSB and the candidate SSB set, where the first processing includes one of the following: receiving system information scheduled by a physical control channel associated with the first SSB; performing radio link monitoring; and performing radio resource management measurement.