Radio Device High Priority Access Mode
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Solution Overview
Problem
The scalability of LTE radio access systems is limited due to inefficient signaling overhead in machine-type communication, particularly for devices with stringent delay and latency requirements, such as smart metering and autonomous driving, where sporadic small packet transmissions are common.
Innovation Solution
A radio communications device operates in a high priority access mode, transmitting a set of different preambles via primary radio resources and payload via secondary radio resources, with the ability to dynamically adjust resource allocation and prioritize transmissions to reduce packet loss and latency, while minimizing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If machine-type communication devices transmit sporadically small payload messages using conventional LTE radio access, then network load increases significantly, but signaling overhead becomes inefficient and scalability is limited
Solution Approach 1:
The patent segments the random access process into two distinct stages: a first stage for transmitting preambles (resource requests) and a second stage for transmitting actual payload data. This segmentation allows the system to handle the large number of machine devices efficiently by separating the resource allocation phase from the data transmission phase, thereby reducing overall signaling overhead while maintaining scalability.
Solution Approach 2:
The patent implements preliminary action by having devices first transmit preambles in a dedicated first stage before transmitting their payload messages in a second stage. This preliminary resource request mechanism allows the network to allocate radio resources in advance, avoiding the need for complex real-time resource allocation and reducing signaling overhead during actual data transmission.
2Ease of operation
If conventional random access is used for machine devices, then device identity is unknown during resource assignment, but this leads to inefficient resource allocation and increased packet loss
Solution Approach 1:
The patent applies preliminary action by transmitting the device identity within the preamble itself during the first stage. This allows the network to identify the device before resource allocation, enabling more efficient resource assignment and reducing packet loss by ensuring that resources are allocated to known devices with confirmed identity, rather than attempting to allocate resources to anonymous devices.
3Loss of time
If high priority access mode is implemented for devices with stringent delay requirements, then packet loss and latency are reduced, but resource allocation complexity increases
Solution Approach 1:
The patent applies local quality by implementing different access modes (high priority and standard priority) for different types of devices or traffic conditions. Devices with stringent delay requirements can utilize the high priority access mode with dedicated resources, while other devices use the standard mode, allowing the system to optimize resource allocation locally for specific needs without overwhelming complexity across the entire network.
Solution Approach 2:
The patent segments the resource allocation process into multiple stages with distinct purposes: the first stage allocates resources for preamble transmission, and the second stage allocates resources for payload transmission. This segmentation enables the system to manage high priority access by reserving specific resources for critical devices while maintaining a structured, manageable allocation process that prevents excessive complexity.
Data Source
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AI summary
It is proposed a first radio communications device (T), especially a terminal, for a radio communications network being configured to: determine (100) a high priority access mode to perform a prioritized transmission of payload (P) to a second radio communications device (BS), especially a base station; perform a high priority access attempt to the second radio communications device (BS) while the first radio communications device (T) is operating in the high priority access mode, wherein performing (102) the high priority access attempt comprises: determining a set of different preambles (pre1, preN), and transmitting (106) to the second radio communications device (BS) the set of different preambles (pre1, preN) simultaneously via a primary radio resource (rr1), especially a primary uplink radio resource; and transmit (108) the payload (P) via at least one secondary radio resource (rr2), especially a secondary uplink radio resource.