Gateway Encryption Synchronization Composite Codeword Embedding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In communication systems, particularly for public safety organizations, there is a challenge with late entry conditions in encryption synchronization, leading to significant voice truncation due to the delay in receiving encryption synchronization parameters, especially when subscribers join calls mid-session.
Innovation Solution
A method is introduced where encryption synchronization data from a first superframe is collected and decoded to form a composite encryption synchronization codeword, which is embedded within subsequent superframes, allowing immediate decryption of media, even for late-joining subscribers, while adjusting the embedding rate to conserve bandwidth and resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If encryption synchronization parameters are embedded only at the start and near the end of each voice superframe, then bandwidth is conserved, but late-joining subscribers experience significant decryption delay and voice truncation
Solution Approach 1:
The gateway performs preliminary action by collecting and decoding encryption synchronization parameters from incoming superframes before they are needed by the subscriber. The composite encryption synchronization codeword is prepared in advance and embedded in the outgoing superframe, ensuring immediate availability for late-joining subscribers without requiring them to wait for parameters to arrive later in the transmission sequence
Solution Approach 2:
The gateway acts as an intermediary between the transmitter and receiver. It collects encryption synchronization parameters from the incoming stream, decodes them, forms a composite codeword, and embeds it in the outgoing superframe. This intermediary processing resolves the contradiction by decoupling the parameter transmission timing from the original superframe structure, providing parameters when needed without proportionally increasing bandwidth usage
2Reliability
If encryption synchronization parameters are collected and decoded from incoming superframes to form composite codewords for outgoing superframes, then decryption availability is improved, but processing complexity increases
Solution Approach 1:
The gateway processes encryption synchronization parameters through segmentation by collecting them from specific locations (start and near end of superframes), decoding them separately from voice data, and recombining them into a composite codeword. This segmentation of processing tasks makes the complex operation manageable and systematic, improving reliability without overwhelming complexity
Solution Approach 2:
The gateway performs multiple functions: collecting parameters from incoming superframes, decoding encryption synchronization data, forming composite codewords, and embedding them in outgoing superframes. This multi-functionality consolidates what would otherwise require separate systems, achieving high reliability while managing complexity through functional integration
3Reliability
If composite encryption synchronization codeword is embedded in every superframe, then decryption reliability is maximized, but bandwidth efficiency decreases
Solution Approach 1:
The composite encryption synchronization codeword is embedded locally in the superframe structure at specific positions rather than uniformly throughout. This local quality approach ensures synchronization reliability is maximized at critical points (where late-joining subscribers need it most) while avoiding unnecessary repetition elsewhere, thereby conserving bandwidth
Data Source
AI summary
Methods for increasing encryption synchronization availability include collecting encryption synchronization data from a first superframe received at a gateway. The encryption synchronization data is for decrypting media in a second superframe also received at the gateway. The encryption synchronization data from the first superframe is used to form a composite encryption synchronization codeword for decrypting media in a third superframe formed by the gateway, wherein the third superframe includes the composite encryption synchronization codeword and at least a portion of the media from the second superframe. The third superframe is sent to a receiving device so that media in the third superframe can be decrypted by the receiving device using the composite encryption synchronization codeword that is included in the same superframe as the media that is being decrypted.