Data Link Beacon Triggered Packet Formation for Jitter Reduction
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Solution Overview
Problem
Existing WLAN data link processes experience delays and jitter in data stream transfer due to variable transmission times, especially with real-time critical data streams like audio and video, and face challenges in seamless handover procedures across unsynchronized base stations.
Innovation Solution
The process triggers the start and end of each data packet formation by beacon signals, ensuring packets align with fixed time intervals between beacon signals, and allows mobile stations to omit certain transmission phases for monitoring and handover preparations, creating time windows for seamless handover and reducing data loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If data packets are transmitted with variable transmission times within transmission phases, then the air interface can be flexibly managed by the base station, but delay and jitter occur in data stream transfer
Solution Approach 1:
The patent applies periodic action by synchronizing data packet formation to occur at fixed intervals triggered by beacon signals. The data packet formation is periodic with the beacon signal interval, ensuring that packets are formed at regular time points rather than with variable transmission times. This periodic formation mechanism eliminates jitter while maintaining flexible air interface management through the beacon-triggered polling structure.
Solution Approach 2:
The patent applies preliminary action by forming data packets in advance at fixed time intervals before transmission. The data packet formation is triggered by beacon signals in advance of the actual transmission phase, allowing packets to be prepared and buffered ready for transmission. This preliminary formation at fixed intervals ensures consistent timing and eliminates variable transmission delays.
2Adaptability or versatility
If mobile stations competitively access the air interface using CSMA/CA, then any device can gain access during transmission pauses, but the transmission time of data packets becomes unpredictable
Solution Approach 1:
The patent applies the intermediary principle by introducing the base station as a coordinating mediator that manages air interface access. Instead of mobile stations directly competing via CSMA/CA, the base station acts as an intermediary that triggers data packet formation at fixed intervals using beacon signals and polls mobile stations in a controlled sequence. This intermediary coordination mechanism provides predictable transmission timing while maintaining flexible access management.
Solution Approach 2:
The patent applies feedback by implementing a polling mechanism where the base station queries mobile stations about their data transmission needs. The base station sends beacon signals that trigger data packet formation, then polls mobile stations to determine which ones have data to transmit. This feedback loop ensures predictable transmission timing while allowing flexible adaptation to varying traffic conditions.
3Loss of time
If transmission phases are shortened to reduce delay, then real-time critical data streams benefit, but handover procedures between base stations become problematic due to lack of synchronization
Solution Approach 1:
The patent applies equipotentiality by establishing a common time reference level across all base stations through synchronized beacon signals. All base stations transmit beacon signals at the same intervals and with the same timing structure, creating an equipotential time framework. This allows mobile stations to perform handovers between base stations without timing conflicts, as all base stations operate from the same time reference, enabling seamless transitions even with short transmission phases.
4Loss of time
If data packet formation is triggered by beacon signals at fixed intervals, then delay and jitter are minimized, but transmission phases must be carefully coordinated with beacon intervals
Solution Approach 1:
The patent applies merging by combining the data packet formation trigger with the existing beacon signal function. Instead of creating a separate timing mechanism for packet formation, the patent merges the formation trigger with the beacon signal that already exists for air interface management. The beacon signal serves dual purposes: managing air interface access and triggering data packet formation at fixed intervals. This merging reduces coordination complexity while achieving minimal delay and jitter.
Data Source
AI summary
The invention relates to a process for the operation of a data link between a base station and one or several mobile stations. According to said process data packets are transmitted between the base station and the mobile stations within transmission phases. The start of each transmission phase is indicated each time through emission of a start signal, and the transmission interface between the base station and the mobile stations for the transmission phase in question is managed by the base station. The data packets are formed with the data of a data stream and a received data stream is formed with the received data packets. The start and the end of each data packet forming operation is each time triggered by the start signals.