Random Access Receiver Activation for Uplink Coverage Recovery
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Solution Overview
Problem
In wireless communication networks, particularly in 5G networks, the inactivation of some receivers at network nodes to conserve power leads to reduced uplink link budget and radio coverage, especially for devices at the cell edge or in non-line-of-sight conditions, causing communication failures during random access procedures.
Innovation Solution
A method and network node that dynamically manage receiver activation based on reception requirements, activating additional receivers when necessary to ensure proper reception of random access messages, and adjusting random access preamble configurations to enhance uplink coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the network node transmits multiple downlink shared channels to the same UE using different physical downlink shared channels, then resource utilization and transmission flexibility are improved, but the complexity of managing and tracking PDCCH monitoring occasions increases
Solution Approach 1:
The patent segments the PDCCH monitoring occasions into distinct sets associated with each physical downlink shared channel. When multiple PDSCHs are configured for a UE, each PDSCH has its own dedicated PDCCH monitoring occasion set, allowing the network node to manage and track monitoring occasions separately for each channel, thereby reducing overall management complexity while maintaining transmission flexibility.
Solution Approach 2:
The patent introduces a new dimension of organization by associating PDCCH monitoring occasions with specific PDSCH configurations in the time-frequency domain. This dimensional separation allows the system to handle multiple PDSCHs without increasing complexity, as each PDSCH-PDCCH pair operates in its own designated monitoring occasion space.
2Reliability
If the random access procedure is restarted after failure, then the probability of successful access is improved, but the access time and network resource consumption increase
Solution Approach 1:
The patent implements dynamic adjustment of random access parameters based on the outcome of previous attempts. When a random access procedure fails, the UE adjusts parameters such as power level, preamble selection, or timing advance for the restarted procedure, making each retry more effective and reducing the time required for successful access compared to static retry mechanisms.
Solution Approach 2:
The system employs feedback mechanisms where the network node provides information about the failure cause and the UE uses this feedback to optimize subsequent random access attempts. This feedback-driven approach allows the system to learn from previous failures and adjust the restart strategy to minimize access time while maintaining high success probability.
Data Source
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AI summary
Disclosed is a method and a network node for handling random access in a wireless communication network (100). The network node (130) has a plurality of receivers (131, 132, 133). The method comprises receiving, from a wireless device (140), a random access preamble when a first number of the plurality of receivers are active and a second number of the plurality of receivers are inactive, and sending, to the wireless device (140), a random access response, in response to the received random access preamble. The method further comprises determining whether a reception requirement for a subsequent random access procedure message sent by the wireless device towards the network node is fulfilled, the subsequent random access procedure message being sent by the wireless device subsequent to the network node sending the random access response, the reception requirement being either whether the random access procedure message is received at the network node or whether the random access procedure message that is received has a sufficient quality, and when the reception requirement is determined not fulfilled, activating at least some of the inactive second number of receivers.