Random Access Response Message Segmentation for Coverage Constrained Devices
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Solution Overview
Problem
Legacy communication procedures in wireless networks are inefficient for coverage constrained devices, as they require resource-intensive and complex repetition of control channels for coverage enhancement, which is not effectively optimized for low-cost, low-processing devices.
Innovation Solution
Modifying the transmission parameters of random access response messages, such as increasing repetition quantities and allocating specific downlink subframe resource elements, to enhance coverage for coverage constrained devices without using Physical Downlink Control Channel (PDCCH) resources, allowing for more flexible and efficient RAR message transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If legacy communication procedures are used for coverage enhancement, then coverage can be improved through control channel repetition, but device complexity and resource consumption increase significantly
Solution Approach 1:
The patent segments the random access response message into two parts: a compact header containing essential information (RAR UL grant, timing advance, temporary ID) and optional payload. This segmentation allows coverage-constrained devices to process only the critical header portion, reducing complexity while maintaining coverage enhancement through selective repetition of the compact message structure.
Solution Approach 2:
The patent extracts and removes the Physical Downlink Control Channel (PDCCH) from the random access response transmission path. By taking out the complex PDCCH structure and its associated control signaling, the system eliminates a major source of device complexity and resource consumption while preserving the essential coverage enhancement function through direct RAR message transmission.
2Reliability
If control channel repetition is used for coverage enhancement, then coverage is improved, but resource wastage increases
Solution Approach 1:
The patent applies local quality by making the RAR message structure adaptable to device capabilities. Coverage-constrained devices receive a simplified version with only essential header information, while other devices can receive the full message with additional payload. This localized optimization reduces resource wastage by transmitting only necessary information to each device type, eliminating redundant transmissions of unnecessary control data.
Solution Approach 2:
The patent implements partial action by transmitting only the essential header portion of the RAR message to coverage-constrained devices, rather than the complete message structure used in legacy systems. This partial transmission approach reduces resource consumption and energy wastage while providing sufficient information for these devices to proceed with random access procedures.
3Adaptability or versatility
If legacy RAR message structure is used, then compatibility is maintained, but transmission efficiency decreases for coverage constrained devices
Solution Approach 1:
The patent introduces dynamics by making the RAR message structure flexible and adaptable to different device types. The system dynamically adjusts the message content based on device capability indicators, transmitting simplified headers to coverage-constrained devices and full messages to other devices. This dynamic adaptation maintains backward compatibility while significantly improving transmission efficiency for devices with limited processing capabilities.
Solution Approach 2:
The patent applies parameter changes by modifying the RAR message structure parameters - specifically reducing the message size, changing the information density, and adjusting the transmission format - to optimize for coverage-constrained devices. These parameter modifications improve transmission efficiency while maintaining compatibility through preserved header structure elements that legacy devices can still process.
Data Source
AI summary
Disclosed herein are methods, apparatuses, and systems for establishing lightweight communications between different network components. A messaging process is utilized which includes a random access procedure for a user equipment (UE) and an eNodeB, and a messaging sequence comprising a reduced number of messages (compared to a legacy Radio Resource Control (RRC) Connection messaging sequence) exchanged between different nodes of the network to establish a lightweight connection. These messages can be generated using any combination of pre-configured or pre-determined data specific to either the UE or to lightweight communications.