NR Cell Reselection with Neighbor MBMS Configuration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Cell reselection in the New Radio (NR) system can result in the interruption of Multimedia Broadcast Multicast Service (MBMS) due to bandwidth and sub-carrier spacing mismatches, leading to poor user experience.
Innovation Solution
A method and apparatus for cell reselection in NR systems that provide configuration information for determining MBMS service deployment and bandwidth parts of neighboring cells, allowing terminals to select suitable target cells for continuous MBMS service reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cell reselection is performed in the NR system, then the terminal device can switch to a better serving cell, but the MBMS service reception is interrupted due to bandwidth and sub-carrier spacing mismatches
Solution Approach 1:
The network device performs preliminary actions by determining and notifying the terminal device of MBMS service deployment information for neighboring cells and adjacent frequencies before cell reselection occurs. This includes bandwidth and sub-carrier spacing configuration information, enabling the terminal to pre-evaluate compatibility and avoid service interruption during reselection.
Solution Approach 2:
The patent introduces MBMS service deployment information as an intermediary element that mediates between the terminal device's cell reselection capability and the network's MBMS service continuity requirement. This information acts as a bridge, allowing the terminal to make informed reselection decisions that maintain service reception.
2Reliability
If the terminal device performs cell reselection without MBMS service deployment information, then the cell reselection process is simple, but the terminal cannot select cells that support continuous MBMS service reception
Solution Approach 1:
The patent extracts only the essential MBMS service deployment information (bandwidth and sub-carrier spacing configuration) from the complete cell configuration data and transmits it separately to the terminal device. This selective extraction provides the necessary information for MBMS service continuity evaluation without overwhelming the terminal with unnecessary configuration details.
3Measurement precision
If the network device provides detailed configuration information for all neighboring cells, then the terminal can make accurate cell selection, but the signaling overhead increases
Solution Approach 1:
The patent applies local quality by providing MBMS service deployment information specifically for neighboring cells and adjacent frequencies that are relevant to MBMS service reception, rather than providing complete configuration information for all cells in the network. This targeted approach maintains cell selection accuracy for MBMS purposes while minimizing unnecessary signaling overhead.
Data Source
AI summary
Provided are a cell reselection method and apparatus, a terminal device, and a network device. The method includes: receiving, by a terminal device, first configuration information transmitted by a serving cell, the first configuration information being used to determine at least one of: MBMS service deployment information of an adjacent frequency, MBMS service deployment information of a neighboring cell, a bandwidth of an initial BWP of the neighboring cell, a sub-carrier spacing of the initial BWP of the neighboring cell, a bandwidth of an MBMS BWP of the neighboring cell, and a sub-carrier spacing of the MBMS BWP of the neighboring cell; and determining, by the terminal device based on the first configuration information device, a target cell for cell reselection.