Seamless MBMS Reception via Dual RF Terminals
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Solution Overview
Problem
Existing multimedia broadcast multicast services (MBMS) in LTE networks experience interruptions during events like incoming calls, flight mode, handoff procedures, and measurement gaps, leading to an undesirable user experience due to the need for uplink connections and network switching.
Innovation Solution
A method for seamless MBMS reception using multiple radio frequency (RF) terminals, where MBMS is received from a primary cell through a first RF terminal, and configured to continue from a non-primary cell, allowing uninterrupted reception during critical events and emergencies, even in flight mode, by managing packet duplication and signal quality thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MBMS reception is performed through a single RF terminal, then device complexity is reduced, but reception reliability deteriorates during critical events like CSFB calls and handovers
Solution Approach 1:
The patent divides the RF terminal into multiple independent RF terminals (first RF terminal and second RF terminal), where each can independently receive MBMS services. This segmentation allows the system to switch between terminals during critical events, ensuring continuous reception without interruption while maintaining manageable complexity through modular design.
Solution Approach 2:
The patent configures the second RF terminal with MBMS parameters in advance before critical events occur. This preliminary configuration ensures that when a handover or CSFB call is detected, the second RF terminal is already prepared to immediately take over MBMS reception without interruption, thus improving reliability without adding complex real-time decision-making mechanisms.
2Adaptability or versatility
If the UE switches to 2G/3G network during CSFB call, then call service is enabled, but MBMS reception is interrupted
Solution Approach 1:
The patent introduces a second RF terminal as an intermediary that continues to receive MBMS services on the LTE network while the first RF terminal handles the CSFB call on 2G/3G network. This intermediary terminal acts as a bridge, allowing the UE to maintain both call service adaptability and MBMS reception reliability simultaneously without mutual interference.
Solution Approach 2:
The patent separates the functions of call handling and MBMS reception into different RF terminals. The first RF terminal is dedicated to handling CSFB calls by switching to 2G/3G networks, while the second RF terminal remains on LTE network to continuously receive MBMS services, thus eliminating the conflict between network switching and service continuity.
3Use of energy by moving object
If flight mode is enabled to save power, then power consumption is reduced, but MBMS reception is interrupted
Solution Approach 1:
The patent extracts the MBMS reception function from the main RF terminal that enters flight mode, and assigns it to a separate second RF terminal that remains active. This extraction allows the primary terminal to fully enter low-power flight mode while the extracted MBMS reception function continues to operate independently, achieving both power savings and service availability.
4Reliability
If packet duplication is not managed during handover, then data loss occurs, but managing packet duplication increases processing complexity
Solution Approach 1:
The patent implements a feedback mechanism where the network detects duplicate packets received during handover between first and second RF terminals, and sends NACK (Negative Acknowledgement) signals to request retransmission. This feedback-based approach ensures data integrity through automatic error correction without requiring complex client-side packet deduplication logic, thus maintaining reliability while controlling processing complexity.
Data Source
AI summary
A method of providing seamless reception of multimedia broadcast multicast services (MBMS) in a user equipment (UE) having multiple radio frequency (RF) terminals is provided. The method includes receiving MBMS from a primary cell (P-Cell) through a first RF terminal in the UE, receiving a command through the first RF terminal while receiving the MBMS configuring the MBMS on a second RF terminal and receiving the MBMS from a non-primary cell wherein the non-primary cell includes at least one of a secondary cell and a non-serving cell.