5G SSB Transmission Location Flexibility in Unlicensed Bands
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Solution Overview
Problem
In the 5G mobile communications system, synchronization signal blocks (SSBs) face challenges in being transmitted within the limited time window of 5 ms, especially in unlicensed frequency bands where channel availability is uncertain, leading to potential missed transmission opportunities.
Innovation Solution
A method for determining a target time domain transmission location for SSBs within a downlink signal transmitting time, allowing for flexible transmission at different time points within the time period, using candidate locations including default and extra time domain transmission locations, and indicating these locations through indication information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SSB transmission uses fixed time locations in licensed frequency bands, then transmission reliability is ensured, but transmission flexibility is reduced in unlicensed frequency bands where channel availability is uncertain
Solution Approach 1:
The patent applies dynamics by making the SSB transmission time location flexible rather than fixed. The network device can dynamically select from multiple candidate time domain locations based on channel conditions detected through LAA procedures. This allows the system to adapt transmission timing to actual channel availability, resolving the contradiction between reliability and flexibility.
Solution Approach 2:
The patent changes the parameter of transmission time location from a fixed value to a selectable set of candidate locations. By defining multiple candidate time domain transmission locations and allowing dynamic selection among them, the system can adjust transmission timing parameters according to channel conditions, thereby achieving both reliability and flexibility.
2Reliability
If the network device performs LAA/CCA channel detection before SSB transmission, then channel availability is checked, but transmission timing becomes uncertain and some SSB transmission opportunities may be missed
Solution Approach 1:
The patent applies preliminary action by performing LAA/CCA channel detection before attempting SSB transmission. This ensures that the channel is actually available before committing to transmission, preventing wasted transmission attempts. The network device checks channel conditions in advance and only proceeds with transmission when the channel is confirmed idle.
Solution Approach 2:
The patent uses dynamics by providing multiple candidate time domain transmission locations and allowing the network device to dynamically select from these candidates based on real-time channel detection results. This dynamic selection mechanism prevents missed transmission opportunities by offering alternative time locations when the primary candidate is unavailable.
3Adaptability or versatility
If multiple candidate time domain transmission locations are provided for SSB, then transmission flexibility is improved, but system complexity increases due to additional indication information
Solution Approach 1:
The patent applies segmentation by dividing the transmission time window into multiple discrete candidate time domain locations. Each candidate location is a distinct, separable time resource that can be independently selected. This segmentation allows flexible transmission without requiring continuous time adjustment, managing complexity through discrete options.
Solution Approach 2:
The patent applies universality by designing a multi-functional indication information mechanism that can convey multiple pieces of information efficiently. The indication information not only identifies the selected time domain location but also implicitly conveys timing advance values and other transmission parameters, reducing overall system complexity through consolidated signaling.
Data Source
AI summary
A synchronization signal block transmission method, a network device, and a terminal are provided. The method includes: determining a target time domain transmission location of a first synchronization signal block within a downlink signal transmitting time, where the target time domain transmission location is one of at least two candidate time domain transmission locations of the first synchronization signal block; and transmitting the first synchronization signal block in the target time domain transmission location.