Shared Feedback Signaling for E-MBMS Session Management
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Solution Overview
Problem
Current E-MBMS technologies face performance limitations, particularly in hotspots and cellular systems without multi-site macro-diversity, where throughput is comparable to or even lower than Rel-6 MBMS, and optimal data rate varies with system load and configuration.
Innovation Solution
Implementing a method to obtain feedback from remote units using shared wireless resources and shared signaling sequences, allowing network equipment to dynamically manage broadcast/multicast service sessions and improve performance by adjusting transmission data rate and power based on received feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If OFDMA/DFT S-OFDM is used for E-MBMS, then spectral efficiency is improved (greater than one), but throughput in hotspots or systems without multi-site macro-diversity remains comparable to or lower than Rel-6 MBMS
Solution Approach 1:
The patent implements feedback mechanisms where remote units send channel quality indicators (CQI) and acknowledgment/negative acknowledgment (ACK/NACK) signals to the network equipment. This feedback enables the network to dynamically adjust transmission parameters such as modulation and coding scheme (MCS), data rate, and resource allocation, thereby optimizing throughput in hotspot scenarios without sacrificing spectral efficiency gains from OFDMA/DFT S-OFDM
2Reliability
If dedicated wireless resources are allocated for feedback from each remote unit, then feedback reliability is improved, but system overhead increases
Solution Approach 1:
The patent combines feedback from multiple remote units into shared wireless resources and signaling sequences. Multiple remote units transmit their feedback (CQI, ACK/NACK) using common uplink resources and shared signaling formats, reducing the overhead associated with dedicated feedback channels while maintaining feedback reliability through proper multiplexing and collision resolution mechanisms
Solution Approach 2:
The patent designs feedback signaling that serves multiple functions simultaneously: the same uplink resources and signaling sequences are used for channel quality reporting, acknowledgment of received data, and transmission power feedback. This multi-functional approach reduces overall system overhead while ensuring reliable feedback collection for dynamic session management
3Productivity
If dynamic session management is implemented to improve E-MBMS performance, then throughput is improved, but system complexity increases
Solution Approach 1:
The patent implements dynamic session management where the network equipment continuously monitors feedback from remote units and adjusts transmission parameters in real-time. The system dynamically modifies data rates, modulation schemes, and resource allocations based on current channel conditions and feedback quality, enabling improved throughput while managing complexity through standardized adjustment algorithms and predefined parameter sets
Data Source
AI summary
Embodiments of the present invention provide a manner in which feedback from remote units (120-122) involved in a broadcast/multicast service session can be obtained using shared wireless resources and/or shared signaling sequences. Having feedback information from at least some of the remote units involved in the session enables the network equipment (101) to dynamically manage the session and potentially improve the performance of the session. Moreover, utilizing shared wireless resources and/or shared signaling sequences may reduce the overhead cost of obtaining the feedback as compared to utilizing dedicated resources.