Dynamic Random Access Response Repetition for MTC
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing random access procedures in wireless communication systems, particularly for Machine Type Communication (MTC) devices, face challenges in optimizing repetition levels for random access response messages, leading to inefficiencies due to a lack of real-time correlation with channel quality conditions.
Innovation Solution
A method for dynamically configuring the repetition levels of random access response messages based on the ratio of successful to initiated random access attempts, allowing for real-time adjustment of repetition levels associated with specific coverage enhancement modes to match the radio conditions of groups of wireless devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fixed repetition levels are used for random access response messages, then device complexity is reduced and ease of operation is improved, but resource efficiency deteriorates and productivity decreases due to mismatch with actual channel conditions
Solution Approach 1:
The patent implements dynamic adjustment of repetition levels based on real-time random access success ratios. The access node monitors the ratio of successful to initiated random access attempts and adjusts the repetition level accordingly, transitioning from fixed to dynamic configuration. This resolves the contradiction by making the system adaptive to changing channel conditions while maintaining operational simplicity through automated feedback-based adjustment.
Solution Approach 2:
The patent introduces a feedback mechanism where the access node monitors random access success ratios and uses this information to adjust repetition levels. The system continuously observes the outcome of random access procedures and modifies transmission parameters based on this feedback, enabling resource optimization without increasing operational complexity for devices.
2Reliability
If higher repetition levels are applied to ensure coverage for MTC devices, then reliability is improved, but resource usage increases and productivity decreases
Solution Approach 1:
The patent applies partial repetition levels based on actual need rather than always using maximum repetitions. By monitoring the random access success ratio, the system determines the minimum necessary repetition level to achieve reliable communication. This prevents excessive resource consumption while maintaining adequate reliability, resolving the contradiction between ensuring coverage and optimizing resource usage.
3Productivity
If dynamic adjustment of repetition levels is implemented, then resource efficiency is improved and productivity increases, but device complexity and measurement precision requirements increase
Solution Approach 1:
The patent implements a feedback-based control mechanism where the access node monitors random access success ratios and automatically adjusts repetition levels. This centralized feedback approach enables dynamic optimization without requiring complex processing at the MTC device side, thus improving productivity while limiting the increase in device complexity.
Solution Approach 2:
The system performs self-adjustment of repetition levels based on monitored performance metrics. The access node autonomously determines optimal repetition levels by observing random access outcomes and adjusting parameters without external intervention or complex device-side processing, enabling productivity improvement with minimal impact on device complexity.
4Device complexity
If repetition levels are not adapted to channel conditions, then device complexity is reduced, but resource waste increases and productivity decreases
Solution Approach 1:
The patent introduces dynamic adaptation of repetition levels to matching channel conditions through monitoring of random access success ratios. This enables the system to adjust resource allocation in real-time, reducing energy waste during good conditions while maintaining reliability during poor conditions, all through automated network-side control that does not increase device complexity.
5Reliability
If maximum repetition levels are always used, then coverage enhancement is maximized and reliability is improved, but resource consumption increases excessively and productivity decreases
Solution Approach 1:
The patent applies the principle of partial action by using only the necessary repetition level required for successful random access rather than always applying maximum repetitions. The system monitors success ratios and adjusts repetition levels to the minimum needed, preventing excessive resource consumption while maintaining adequate reliability for coverage enhancement.
6Productivity
If repetition levels are dynamically adjusted based on success ratios, then resource efficiency is improved, but measurement precision requirements and device complexity increase
Solution Approach 1:
The patent implements feedback-based adjustment using the random access success ratio as the measurement metric. This approach balances measurement precision requirements by using a straightforward ratio calculation that provides sufficient information for adjustment decisions without demanding high measurement precision, enabling productivity improvement with manageable complexity.
Data Source
AI summary
The present disclosure relates to methods and arrangements for dynamically configuring repeated transmission of random access response messages from an access node, wherein the random access response message is repeatedly transmitted in response to receipt of a random access request from wireless device operating in a coverage enhancement, CE, mode and wherein the random access response message is configured for repeated transmission on a downlink channel using a repetition level selected from a set of repetition levels associated with a CE level of the CE mode. The repetition level represents a predetermined number of repeated transmissions and the CE level represents a group of wireless devices with similar radio conditions. The method comprises determining, for a predetermined data set, a ratio of successful to initiated random access attempts when applying a selected repetition level of the set of repetition levels for repeated transmission of the random access response messages on the downlink channel, wherein a random access attempt is counted as successful responsive to receipt of a first uplink transmission on a packet uplink shared channel, PUSCH. The method further comprises selecting an operational repetition level of the set of repetition levels for repeated transmission of random access response messages on the downlink channel based on the determined ratio.