Wireless Access Notification for Latency-Critical Services
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Solution Overview
Problem
In latency-critical services, contention-based multiple access radio channels without prior resource reservation often result in packet collisions, making it difficult for base stations to identify and correct unreceived packets, especially under the stringent latency constraints of 5G networks like IMT-2020, which require low latency and high reliability.
Innovation Solution
The solution involves mobile stations notifying the base station of their access attempts using unique transmission codes on dedicated uplink resources, allowing the base station to identify and instruct retransmissions of unreceived packets while minimizing detection time and respecting latency constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If contention-based multiple access radio channel without prior resource reservation is used, then resource utilization efficiency is improved, but packet collision probability increases
Solution Approach 1:
The base station sends feedback information to mobile stations indicating whether their packets were successfully received. This feedback mechanism enables mobile stations to know whether retransmission is needed, resolving the contradiction by maintaining high resource utilization while improving packet transmission reliability through active reception status notification
Solution Approach 2:
The patent introduces an intermediary feedback message from the base station that mediates between transmitting mobile stations and the network. This intermediary communication channel provides reception status information without requiring dedicated reservation channels, thus maintaining resource efficiency while improving reliability
2Measurement precision
If timeout-based detection method is used, then transmission failure detection is achieved, but latency requirement is not met
Solution Approach 1:
The base station proactively sends feedback information about packet reception status before the mobile station would otherwise need to wait for timeout. This preliminary action provides immediate detection of transmission failures, achieving both accurate detection and low latency by eliminating the need for timeout waiting
Solution Approach 2:
The feedback mechanism provides real-time reception status information, replacing the passive timeout-based detection with active notification. This reduces detection time significantly while maintaining accurate identification of transmission failures
3Device complexity
If base station cannot identify colliding packets, then channel resource management is simplified, but retransmission accuracy decreases
Solution Approach 1:
The base station uses feedback information containing mobile station identifiers to determine which specific packets were not received. This allows the base station to identify colliding packets and instruct specific mobile stations for retransmission, improving retransmission accuracy without requiring complex collision detection algorithms
Data Source
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AI summary
The invention relates to wireless communication devices (110, 120), systems (100) and methods (200, 300) for establishing latency-critical services. The general principle of the invention is based on the fact that, when a mobile station attempts to transmit a packet on a contention-based multiple-access radio channel without a prior reservation of channel resources, the invention allows the mobile station to notify the base station of its attempt to randomly access the channel. The notification is performed on dedicated channel resources. Upon receipt of the notification of a mobile station's access attempt, the base station can know that a mobile station is the origin of the colliding packets, and can therefore correctly instruct the retransmission of packets that were not received.