Multicast Transmission Parameter Adjustment for QoS Differentiation
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Solution Overview
Problem
Current Multimedia Broadcast Multicast Service (MBMS) and evolved MBMS (eMBMS) technologies face challenges in ensuring reliable and efficient transmission of multicast content data due to feedback implosion issues, constant overhead from application layer forward error correction, and lack of quality of service (QoS) differentiation, particularly in scenarios with diverse wireless device conditions.
Innovation Solution
Implementing a system and method that adjusts transmission parameters based on feedback from wireless devices, allowing for differentiated quality of service levels by varying content bit rates, coding rates, and modulation and coding schemes, enabling adaptive transmission schemes to improve reliability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If application layer forward error correction is used to increase transmission reliability, then reliability is improved, but device complexity and computational overhead increase
Solution Approach 1:
The system implements feedback mechanisms where receiving devices report channel quality and decoding status to transmitting devices. Based on this feedback, the system dynamically adjusts transmission parameters including whether to apply forward error correction, thereby optimizing the balance between reliability and computational overhead for different channel conditions.
Solution Approach 2:
The patent introduces dynamic adaptation of transmission parameters including forward error correction application based on real-time channel conditions. The system transitions from static to dynamic parameter selection, allowing forward error correction to be applied selectively rather than uniformly, reducing computational overhead when channel conditions permit.
2Reliability
If fixed content bit rates and coding rates are used to ensure service for devices in worst channel conditions, then reliability is improved, but productivity decreases due to over-provisioning
Solution Approach 1:
The system applies different transmission quality levels to different receiving devices based on their individual channel conditions. Devices in poor channel conditions receive transmissions with higher redundancy and error correction, while devices in good channel conditions receive transmissions with lower overhead, optimizing overall resource utilization while maintaining service reliability for all users.
Solution Approach 2:
The patent implements dynamic parameter adjustment where content bit rates and coding rates are modified based on channel conditions and device capabilities. The system transitions from fixed parameters optimized for worst-case scenarios to adaptive parameters that match actual channel conditions, improving resource utilization efficiency while maintaining service reliability.
3Productivity
If multicast transmission is used to efficiently deliver content to multiple devices, then productivity is improved, but reliability worsens due to feedback implosion and lack of QoS differentiation
Solution Approach 1:
The system dynamically adjusts transmission parameters including modulation schemes, coding rates, and resource allocation based on channel conditions and QoS requirements. This allows multicast transmissions to adapt to varying channel conditions across different devices, improving reliability while maintaining the efficiency benefits of multicast delivery.
Solution Approach 2:
The patent implements feedback mechanisms where receiving devices report channel quality and decoding status to transmitting devices. This feedback enables the system to adjust transmission parameters and retransmit data selectively, improving content delivery reliability in multicast scenarios without causing feedback implosion through intelligent feedback management.
4Productivity
If differentiated QoS levels are implemented to serve premium users, then productivity increases through better resource utilization, but device complexity increases
Solution Approach 1:
The system implements differentiated QoS by applying different transmission quality levels to different receiving devices based on their service subscriptions and channel conditions. Premium users receive transmissions optimized for higher quality with appropriate error correction and modulation schemes, while standard users receive transmissions optimized for their specific requirements, improving overall resource utilization through localized quality adjustment.
Data Source
AI summary
According to certain embodiments, methods and systems for providing broadcast multicast service include transmitting, by a network node, a first transmission of multicast content data to wireless devices at a first quality of service level and a second transmission of multicast content data to the wireless devices at a second quality of service level. The second quality of service level may be of a higher quality of service than the first quality of service. Feedback may be received from at least one wireless device in the broadcast service area. In response to the feedback from the wireless devices, one or more transmission parameters associated with a subsequent transmission of the multicast content data may be adjusted.