Cell Reselection Frequency Priority for Multicast Service Continuity
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Solution Overview
Problem
In LTE and NR multicast broadcast services, user equipment (UE) faces challenges in maintaining continuity of multicast broadcast services during cell reselection, especially when not in RRC connected mode, leading to difficulties in receiving the service as soon as possible after cell reselection.
Innovation Solution
The method involves obtaining assistance information related to the multicast broadcast service and determining the priority of cell reselection frequency based on this information, allowing non-RRC connected UE to perform cell reselection efficiently and maintain service continuity by setting frequencies providing multicast services as the highest priority.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If non-RRC connected UE performs cell reselection without assistance information, then the UE can perform cell reselection autonomously, but the service continuity of multicast broadcast service cannot be guaranteed and the UE cannot receive the service as soon as possible after reselection
Solution Approach 1:
The network device performs preliminary actions by determining cell reselection frequency priority information and sending assistance information to the UE before the UE performs cell reselection. This allows the UE to have advance knowledge of frequency priorities, enabling it to quickly reselect to frequencies providing multicast broadcast services without losing service continuity.
2Reliability
If the UE stays on a frequency providing multicast broadcast service, then the service continuity is maintained, but the UE cannot perform cell reselection to better cells efficiently
Solution Approach 1:
The network device provides assistance information in advance that includes cell reselection frequency priority information, which tells the UE which frequencies to prioritize for reselection. This preliminary guidance allows the UE to efficiently perform cell reselection to frequencies providing multicast broadcast services without having to stay indefinitely on the current frequency.
3Reliability
If assistance information is provided to non-RRC connected UE, then the service continuity and reselection speed are improved, but the network device complexity increases due to additional information processing
Solution Approach 1:
The network device applies local quality by providing assistance information specifically tailored to UEs that are interested in or receiving multicast broadcast services. The assistance information includes specific frequency priority details relevant only to multicast service frequencies, rather than providing general cell reselection information to all UEs, thus minimizing unnecessary complexity.
Data Source
AI summary
An information transmission method includes obtaining assistance information related to a multicast broadcast service; and determining a priority of a cell reselection frequency based on the assistance information.