Latency Compensation in Content Delivery Networks
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Solution Overview
Problem
Current content delivery networks face challenges in accurately measuring latency, which affects the precision of advertising views and user interaction data, particularly for short content like commercials, as existing systems like Nielsen Ratings struggle to account for latency, leading to inaccurate viewer metrics and impacting advertising effectiveness.
Innovation Solution
The development of methods and apparatus to identify, characterize, and compensate for latency in content delivery networks by determining device-specific and network-specific latency, allowing for accurate adjustment of interaction data records to reflect real-time viewer actions, using consumer premises equipment and network apparatus to synchronize data collection and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional rating systems like Nielsen Ratings are used to measure viewing habits, then broad population coverage is achieved, but measurement precision for short content and second-by-second statistics deteriorates due to inability to account for latency
Solution Approach 1:
The system performs preliminary latency characterization by sending test messages from the headend to each CPE and measuring round-trip times before actual content delivery. This preliminary measurement of network latency allows the system to compensate for transmission delays in subsequent viewing statistics, enabling precise second-by-second measurement without requiring complex real-time adjustments during content playback
Solution Approach 2:
The patent introduces an intermediary latency compensation mechanism that acts between the content delivery system and the rating measurement system. By calculating and applying latency offsets based on pre-measured network conditions, this intermediary layer corrects timing discrepancies without requiring fundamental changes to either the content delivery infrastructure or the rating methodology, thus improving precision while limiting complexity increase
2Measurement precision
If latency compensation mechanisms are implemented to account for network delays, then measurement accuracy improves, but device complexity and processing requirements increase
Solution Approach 1:
The system pre-calculates latency compensation values by measuring round-trip message times between headend and CPE during system initialization or periodic intervals. These pre-computed latency offsets are stored and applied to viewing statistics without requiring complex real-time calculations during content playback, thereby improving advertising metrics accuracy while keeping processing requirements manageable
Solution Approach 2:
Each CPE autonomously participates in latency measurement by responding to test messages from the headend with timestamped replies. The CPE itself generates the data needed for latency calculation, eliminating the need for external measurement equipment or complex centralized processing, thus improving accuracy while limiting the increase in overall system complexity
3Ease of operation
If round-trip message timing is used to determine one-way latency, then measurement feasibility is achieved, but measurement precision deteriorates due to bidirectional path variations
Solution Approach 1:
The system changes the measurement parameter from direct one-way latency (which is difficult to measure) to round-trip time (which is easily measurable). By sending a test message with a timestamp from the headend and receiving a reply with the arrival timestamp at the CPE, the system obtains round-trip duration. This parameter change enables practical latency measurement while the patent acknowledges and compensates for the bidirectional path variation through systematic offset calculation applied to viewing statistics
Data Source
AI summary
Methods and apparatus for identification and characterization of latency in a content delivery network. In one embodiment, interaction of users with content is recorded via collection of tuning records; the latency is then utilized to adjust the timing on the tuning records to account for lapses in time for sending these between entities of the network and the user devices, and for processing occurring at the devices. The latency is determined by taking into account a device specific latency component, and a network latency component. The network latency component is determined in one variant by sending a message to the device from the network requesting a response. Once the timing of the tuning records is adjusted, these tuning records may be relied upon as being accurate on a second-by-second basis. Accordingly, tuning records may be obtained and analyzed for content which lasts for a very short period of time.