Sliding Resource Window for Random Access Slot Selection
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Solution Overview
Problem
In wireless communication networks, mobile terminals experience delays and increased preamble collisions when selecting random access slots, as they are limited to choosing from a smaller number of assigned access slots within the current access slot set, leading to biased slot selection towards the end of the slot set.
Innovation Solution
A sliding resource window is provided, allowing mobile terminals to select from a combination of assigned access slots from both the current and upcoming access slot sets, ensuring a consistent number of available slots and reducing collision probability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If mobile terminals are limited to selecting random access slots only from the current access slot set, then the number of available slots is reduced, but this leads to increased preamble collisions and biased slot selection towards the end of the slot set
Solution Approach 1:
The patent implements a dynamic random access slot selection mechanism where the available resource window is adjusted based on the current time position within the access slot set. The window size and position are dynamically modified to include slots from both current and next access slot sets, allowing the system to adapt the number of available slots based on timing conditions while maintaining controlled collision probability through the parameter N.
Solution Approach 2:
The patent changes the parameter defining the random access resource window from a fixed current-set-only constraint to a flexible window that spans across access slot set boundaries. The window parameter is configured to include a determined number of slots from the next access slot set, transforming the static selection constraint into a dynamic parameter that can be adjusted based on system conditions and timing.
2Ease of operation
If mobile terminals select from a smaller number of assigned access slots within the current access slot set, then the selection process is simplified, but this causes biased slot selection towards the end of the slot set and increased collisions
Solution Approach 1:
The patent introduces a dynamic window adjustment mechanism that automatically adapts the random access resource selection range based on the current time position. The network device configures a window that dynamically includes slots from both current and next access slot sets, maintaining operational simplicity while eliminating the end-bias problem through automated window position and size adjustment.
Solution Approach 2:
The patent extends the random access slot selection from a single access slot set dimension to a multi-set dimension by allowing selection across current and next access slot sets. This dimensional extension provides additional available slots while maintaining uniform distribution, preventing the end-bias that occurs when selection is restricted to only the current set.
3Reliability
If mobile terminals are allowed to select from both current and upcoming access slot sets, then the number of available slots increases and collision probability decreases, but this may increase device complexity for window management
Solution Approach 1:
The patent implements a feedback-based window management system where the network device monitors the random access response and provides feedback to confirm successful access. The network device receives the random access response from the mobile terminal and determines whether the random access was successful, using this feedback to manage the resource window and coordinate between current and next access slot sets without requiring complex terminal-side window management.
Solution Approach 2:
The network device acts as an intermediary that manages the complexity of multi-set resource window coordination. Rather than requiring the mobile terminal to independently manage complex window spanning multiple access slot sets, the network device configures and controls the window parameters, receiving feedback and making coordination decisions, thereby reducing terminal device complexity while enabling extended resource selection.
Data Source
AI summary
Performing a random access procedure from a mobile terminal to communicate with a wireless communication network includes providing a first and second group of available random access radio resources. The first and second group comprises a plurality of random access radio resources assigned to the mobile terminal for sending a random access preamble to the wireless communication network. A sliding resource window is provided to the mobile terminal, the resource window comprising a plurality of consecutive available random access radio resources from at least one of the two groups. The mobile terminal may randomly select, from the resource window, one of the available random access radio resources assigned to the mobile terminal for sending the random access preamble, and a start of the sliding resource window depends on an available random access radio resource, which is currently valid for uplink random access to the cell of the wireless communication network.