Ambient IoT Random Access Retransmission for Msg3 Failures
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Solution Overview
Problem
Existing wireless communication systems face challenges in handling unsuccessful transmissions from Ambient Internet-of-Things (IoT) devices, particularly in managing Msg3 reception failures without introducing significant latency or decoding complexity, which is crucial for devices with limited power storage and complex interference scenarios.
Innovation Solution
A method is introduced where a network/reader transmits a paging message triggering a device to perform a random access procedure, receives and echoes the device's ID, and adjusts scheduling information to handle Msg3 failures by allowing devices to perform retransmissions without additional latency or decoding complexity, using dedicated or common resources for successful communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network transmits a second Msg2 to handle Msg3 reception failure, then the reliability of communication is improved, but the latency increases
Solution Approach 1:
The network pre-configures the random access procedure with scheduled Msg3 transmission opportunities. When Msg3 reception fails, the network has already prepared the framework for retransmission through the initial Msg2, allowing the device to perform Msg3 retransmission without requiring additional signaling rounds, thus reducing the latency penalty while maintaining reliability
Solution Approach 2:
The network uses the Msg2 message as a feedback mechanism that includes scheduling information for Msg3 transmission. When Msg3 reception fails, the network sends another Msg2 with updated scheduling information, creating a feedback loop that efficiently manages retransmissions without significant latency increase
2Reliability
If the network implements comprehensive error handling for Ambient IoT devices, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The patent extracts the error handling complexity from the device side and places it on the network side. The network is responsible for monitoring Msg3 reception success and managing retransmission scheduling, while the device simply follows the scheduling instructions received in Msg2 messages. This extraction reduces device complexity while maintaining comprehensive error handling
Solution Approach 2:
The Msg2 message acts as an intermediary that carries scheduling information between the network and the device. Instead of the device needing to understand complex error handling protocols, it simply follows the scheduling instructions provided in Msg2, which mediates the communication and simplifies device implementation
3Reliability
If the network uses dedicated resources for each device, then the communication reliability is improved, but the resource allocation complexity increases
Solution Approach 1:
The Msg2 message serves multiple functions: it acknowledges the device's Msg1 transmission, provides scheduling information for Msg3, and can trigger retransmission procedures. This multi-functionality allows the network to maintain reliable communication while avoiding the complexity of separate dedicated resource allocation mechanisms for each function
Data Source
AI summary
Methods, systems, and apparatuses are provided for handling Ambient Internet-of-Things (IoT) unsuccessful transmissions in a wireless communication system, wherein a method for a reader comprises transmitting a paging message triggering at least a first device to perform a random access procedure, receiving, from the first device, at least a first Msg1 transmission of the random access procedure, wherein the first Msg1 transmission includes an Identification (ID) associated with the first device, transmitting a first Msg2, of the random access procedure, including at least the ID, wherein the first Msg2 comprises at least a first scheduling information for a first Msg3 transmission, of the random access procedure, to be transmitted by the first device, transmitting a second Msg2, of the random access procedure, including at least the ID in response to failing to receive or decode at least the first Msg3 transmission, and receiving, in response to transmitting the second Msg2, at least the second Msg3 transmission of the random access procedure from the first device.