PRACH Transmission Collision Avoidance via SSB Timing
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Solution Overview
Problem
In 5G wireless communication systems, the transmission of Physical Random Access Channels (PRACH) often experiences collisions due to SSB transmission, leading to inefficient PRACH transmission.
Innovation Solution
A method and device for transmitting PRACH by receiving Synchronization Signal Block (SSB) and PRACH resource information, allowing PRACH transmission on a valid PRACH resource allocated after SSB reception, which can be either uplink or downlink allocated, with a gap based on subcarrier spacing, specifically two symbols for 120 kHz spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PRACH transmission is performed on allocated PRACH resources, then PRACH transmission capability is provided, but transmission collisions occur due to SSB transmission
Solution Approach 1:
The base station performs preliminary action by transmitting SSB information to the terminal before PRACH transmission. The terminal uses this advance information to identify and select valid PRACH resources that do not collide with SSB transmission, thereby resolving the contradiction between maintaining PRACH transmission capability and avoiding transmission collisions.
2Device complexity
If PRACH resources are allocated without considering SSB reception, then resource allocation simplicity is maintained, but transmission efficiency decreases due to collisions
Solution Approach 1:
The patent applies local quality by making PRACH resource validity location-dependent. Specifically, PRACH resources are evaluated based on their temporal relationship with SSB reception - resources allocated after SSB reception symbols are marked as valid, while others are invalid. This localized differentiation resolves the contradiction by improving transmission efficiency only where necessary (near SSB transmissions) without increasing overall system complexity.
3Device complexity
If PRACH transmission timing is not adjusted relative to SSB, then timing synchronization is simplified, but transmission reliability deteriorates due to resource conflicts
Solution Approach 1:
The patent segments the PRACH resources in the time domain by introducing a gap between SSB reception symbols and valid PRACH transmission resources. This segmentation separates conflicting transmissions (SSB and PRACH) into distinct time intervals, resolving the contradiction between simplified timing synchronization and reliable transmission by avoiding overlap through temporal segmentation.
Data Source
AI summary
The present invention discloses a method of transmitting a Physical Random Access Channel (PRACH) by a terminal in a wireless communication system. Specifically, the method includes: receiving first information related to a Synchronization Signal Block (SSB) and second information related to PRACH resources; and transmitting the PRACH on a valid PRACH resource among the PRACH resources based on the first and second information. In this case, valid PRACH resource may be a PRACH resource allocated after symbols in which the SSB is received among the PRACH resources included in a PRACH slot related to the second information.