Cell Reselection Priority for Public Safety eMBMS Terminals
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Solution Overview
Problem
PS-LTE terminals face challenges in maintaining continuous public safety service access due to the need to switch frequencies between regular and PS-LTE service modes, which can disrupt eMBMS service reception during cell reselection.
Innovation Solution
A method and apparatus that determine whether a terminal is receiving MBMS service and configure the highest priority for the frequency band supporting eMBMS, ensuring the terminal continues to receive the public safety service by selecting the current frequency during cell reselection through a connection release message with priority information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a terminal switches frequency between regular and PS-LTE service modes, then the terminal can access different service types, but the eMBMS service reception is disrupted during cell reselection
Solution Approach 1:
The base station performs preliminary configuration by determining the terminal's service type (PS-LTE or regular) before cell reselection occurs, and pre-configures the appropriate frequency priority information in the connection release message. This ensures the terminal has the correct frequency priorities ready before reselection begins, preventing service disruption.
Solution Approach 2:
The system uses feedback about the terminal's service type (PS-LTE or regular) to dynamically adjust the frequency priority information provided to the terminal. The base station receives feedback regarding which service the terminal is receiving and responds by configuring appropriate frequency priorities, creating a closed-loop control that maintains service continuity.
2Adaptability or versatility
If the terminal prioritizes frequency switching for service mode changes, then service adaptability is improved, but service continuity during reselection deteriorates
Solution Approach 1:
The base station determines the terminal's current service type and pre-configures frequency priority information before the terminal performs cell reselection. This preliminary configuration ensures that when the terminal does switch frequencies for service mode changes, it maintains continuous eMBMS reception by having the correct priority information already in place.
3Ease of operation
If the terminal follows standard cell reselection procedures, then general service access is maintained, but PS-LTE service continuity is lost
Solution Approach 1:
The invention applies a specialized frequency priority configuration specifically for PS-LTE terminals receiving eMBMS service, while regular terminals follow standard procedures. The base station identifies PS-LTE terminals and provides them with tailored frequency priority information that prioritizes the frequency carrying eMBMS service, creating a localized optimization for this specific service type without affecting other terminals.
Data Source
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AI summary
The terminal supporting the public safety service based on the evolved multimedia broadcast multicast services (eMBMS) service needs to reselect a frequency providing the eMBMS service in the idle mode. The terminal may be configured to: receive a connection release message including priority information on frequencies for cell reselection; determine whether the terminal is in the idle mode; and perform, if the terminal is in the idle mode, cell reselection by selecting a cell to camp on based on the priority information. Here, the priority information may be configured so that the highest priority is assigned to the MBMS serving frequency used by the terminal to receive the MBMS service. In this way, the terminal supporting the public safety service may continuously receive the public safety service by selecting the current frequency during cell reselection.