RMSI Resource Mapping in 5G NR-U SSB Collision
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Solution Overview
Problem
In the 5G NR-U system, there is a challenge in determining unavailable time-frequency resources due to collisions between SSB and RMSI resources, which affects data transmission efficiency and power consumption, especially when transmitting first-type SSB and cell RMSI simultaneously in limited time-frequency domains.
Innovation Solution
A method is provided for a terminal device and network device to determine unavailable resources for RMSI by identifying resources corresponding to first-type SSBs transmitted on a non-Synchronization Signal raster, allowing for correct resource mapping and flexible system scheduling without intentional collision avoidance between SSB and PDCCH/PDSCH resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If collision avoidance between SSB and RMSI resources is implemented, then resource mapping accuracy is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent changes the parameter of resource allocation by introducing a new parameter 'unavailable resource indication information' that dynamically marks resources occupied by first-type SSBs. This allows the system to adapt resource mapping based on actual SSB transmission positions without requiring fixed collision avoidance patterns, thereby improving both mapping accuracy and resource utilization.
Solution Approach 2:
The patent introduces an intermediary mechanism - the unavailable resource indication information transmitted from network device to terminal device - that mediates between SSB transmission requirements and RMSI resource allocation. This intermediary allows both functions to coexist by providing explicit information about resource unavailability without requiring complex collision avoidance algorithms.
2Adaptability or versatility
If flexible scheduling is implemented without collision avoidance, then resource allocation flexibility is improved, but resource mapping accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by having the network device pre-indicate unavailable resources through unavailable resource indication information before terminal devices perform resource mapping. This allows terminal devices to flexibly schedule RMSI transmissions while maintaining accurate resource mapping by avoiding pre-marked unavailable resources, thus resolving the contradiction between flexibility and accuracy.
3Reliability
If terminal device monitors all possible RMSI resources, then resource detection completeness is improved, but power consumption increases
Solution Approach 1:
The patent extracts and removes unavailable resources from the set of monitorable RMSI resources by providing unavailable resource indication information to terminal devices. Terminal devices can then exclude these indicated unavailable resources from their monitoring lists, maintaining complete detection of actual RMSI transmissions while significantly reducing power consumption by not monitoring resources that are guaranteed to be unavailable.
Data Source
AI summary
Provided are a method for determining an unavailable resource, a terminal device, and a network device. The method includes: determining, by a terminal device, a first resource corresponding to a first-type Synchronization Signal Block (SSB); and determining, by the terminal device, an unavailable resource for Remaining System Information (RMSI) based on the first resource and a second resource corresponding to the RMSI. The first-type SSB is an SSB transmitted on a non-Synchronization Signal (SS) raster. Based on the first resource corresponding to the first-type SSB and the second resource corresponding to the RMSI, the unavailable resource for the RMSI can be determined. This not only ensures that the RMSI resource mapping can be performed correctly, but also makes system scheduling more flexible. For example, a network device does not have to intentionally avoid collisions between the SSB and a PDCCH and a PDSCH of the RMSI in limited time-frequency resources.