DECT ULE Reachability Detection for Controlled Retransmissions
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Solution Overview
Problem
Existing DECT ULE standards do not limit the number of retransmissions by a base station when attempting to communicate with a portable device that is offline or out of range, leading to wastage of resources such as power, memory, and processing resources.
Innovation Solution
Implementing a method where a base station determines reachability by listening for a threshold period without receiving an acknowledgement, and upon determining a device is unreachable, refrains from further retransmissions and removes messages from the transmission queue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station repeatedly retransmits messages to portable devices without limiting retransmission attempts, then the reliability of message delivery is improved, but the consumption of base station resources (power, memory, processing) increases significantly
Solution Approach 1:
The base station performs preliminary actions by listening for a threshold period after message transmission to detect device reachability before committing to repeated retransmissions. This preliminary detection prevents futile retransmission cycles and conserves energy while maintaining reliable delivery for reachable devices.
Solution Approach 2:
The system implements feedback mechanisms where the base station monitors for acknowledgment messages from portable devices. Based on this feedback (presence or absence of ACK within threshold period), the base station dynamically adjusts its retransmission behavior, stopping retransmissions when devices are determined unreachable, thus optimizing energy usage while ensuring reliable delivery when possible.
2Reliability
If the base station performs unlimited retransmission attempts to ensure message delivery, then the reliability of communication is improved, but the processing resources and memory consumption increase
Solution Approach 1:
The base station executes preliminary reachability detection by listening for a threshold period after transmission before initiating repeated retransmission cycles. This preliminary check simplifies processing by avoiding complex unlimited retransmission logic while maintaining communication reliability for reachable devices.
Solution Approach 2:
The system dynamically adjusts retransmission behavior based on detected device reachability. When devices are unreachable, retransmissions are stopped; when reachable, normal retransmission protocols continue. This dynamic adaptation reduces processing complexity by avoiding futile operations while preserving communication reliability.
3Reliability
If the base station continuously retransmits messages to offline or out-of-range devices, then message delivery reliability is maintained, but the time required for resource reallocation to reachable devices increases
Solution Approach 1:
The base station performs preliminary reachability assessment by listening for a threshold period after message transmission. This preliminary detection quickly identifies unreachable devices, enabling rapid resource reallocation to reachable devices while maintaining message delivery reliability through continued retransmissions only to reachable targets.
Solution Approach 2:
The system uses feedback from the listening period (detection of acknowledgment or timeout) to rapidly adjust retransmission behavior. This feedback mechanism enables quick identification of unreachable devices and immediate resource reallocation, minimizing time loss while preserving communication reliability for reachable devices.
Data Source
AI summary
This disclosure provides methods, devices, and systems for wireless communications. The present implementations more specifically relate to techniques for detecting a reachability of portable devices in a digital enhanced cordless telecommunications (DECT) ultra low energy (ULE) home automation networks (HAN). In some aspects, a base station may determine that a portable device is unreachable after failing to receive an ACK from the device after a threshold number of retransmissions or a threshold amount of time has elapsed. Upon determining that a portable device is unreachable, the base station may remove any messages intended for the device from its transmission queue and may refrain from processing any further transmissions to the device. A base station may determine that a portable device is reachable again after receiving a communication from the device. In some implementations, a base station may notify a host application or processor about the reachability of the portable devices.