ARQ Configuration Using Propagation Delay for Packet Delivery
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Solution Overview
Problem
Conventional MMT systems face inefficiencies in packet retransmission due to lack of valid period information for Asset Delivery Characteristics (ADC) and unnecessary information management at the network level, leading to resource consumption and delayed packet recovery.
Innovation Solution
The method involves transmitting an ARQ configuration message with propagation delay information, allowing the receiving entity to determine packet delivery time and decide on retransmission based on this, rather than relying on arrival deadline values, and managing delivery characteristics at the bundle level to optimize resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conventional ARQ method uses arrival deadline values for retransmission decisions, then the receiving entity can determine when to expect packets, but the system consumes large amounts of time and resources to derive the arrival deadline value and may give up response transmission
Solution Approach 1:
The patent changes the parameter used for retransmission decision from arrival deadline value to propagation delay information. The transmitting entity includes propagation delay in the ARQ configuration message, and the receiving entity uses this propagation delay to determine delivery time, replacing the complex arrival deadline derivation process with a simpler propagation delay-based calculation.
Solution Approach 2:
The receiving entity autonomously determines packet delivery time using the propagation delay information provided by the transmitting entity, without requiring the transmitting entity to calculate and manage complex arrival deadline values. This shifts the computational burden and decision-making to the receiving entity, which has better visibility into packet reception status.
2Adaptability or versatility
If the transmitting entity manages delivery characteristics at the Asset level, then individual asset retransmission can be controlled, but the network level experiences unnecessary information management and resource consumption
Solution Approach 1:
The patent merges multiple Asset delivery characteristics into a single Bundle delivery characteristic. Instead of managing ARQ parameters for each individual Asset, the system manages them at the Bundle level, which groups related Assets together. This reduces the amount of information that needs to be tracked and managed while still enabling selective retransmission control.
Solution Approach 2:
The Bundle-level delivery characteristic management serves multiple Assets simultaneously, making the ARQ mechanism more universal. A single set of propagation delay and retransmission parameters applies to all Assets within a Bundle, reducing redundant information management while maintaining the ability to control retransmission behavior across different asset types.
Data Source
AI summary
A method for transmitting, by a transmission entity, a packet in a system, according to an embodiment of the present invention, comprises the steps of: transmitting an automatic repeat request (ARQ) configuration (AC) message including ARQ configuration information; receiving an ARQ feedback (AF) message indicating that one or more packets are lost, the AF message including information on a propagation delay for packets to arrive at a receiving entity; identifying a delivery time of the packets between the receiving entity and the transmitting entity based on the propagation delay included in the AF message; and determining whether to transmit one or more lost packets based on the delivery time.