Random Access Channel Occasion Selection Based on PUSCH Load
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Solution Overview
Problem
In New Radio (NR) systems, terminals lack the ability to select an appropriate Random Access Channel Occasion (RO) for accessing the base station, as existing methods do not provide a mechanism for determining the optimal RO based on load values or current states.
Innovation Solution
A method where a terminal receives a load value broadcasted by the base station, determining the RO by selecting between a first preset RO and a second preset RO based on the load value, and optionally considering its current state, to decide when to send a random access preamble, allowing for efficient access channel utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the terminal uses a fixed RO selection method, then the device complexity is reduced, but the access efficiency deteriorates due to inability to adapt to varying load conditions
Solution Approach 1:
The patent implements dynamic RO selection by allowing the terminal to adaptively choose between first and second ROs based on real-time load value feedback from the base station. This dynamic adjustment mechanism enables the system to respond to varying network conditions, improving access efficiency without requiring complex terminal-side decision algorithms.
Solution Approach 2:
The base station broadcasts load values to terminals, creating a feedback loop that enables informed RO selection. The terminal uses this feedback information to determine the appropriate RO, achieving adaptive access efficiency improvement while keeping the terminal's decision-making logic relatively simple.
2Reliability
If the terminal selects RO without considering load value, then the ease of operation is improved, but the reliability of random access deteriorates due to potential conflicts and collisions
Solution Approach 1:
The base station performs preliminary assessment of network load and broadcasts load values before the terminal executes random access. This preliminary action provides the terminal with necessary information to make reliable RO selection, reducing access conflicts without requiring complex terminal-side load assessment capabilities.
Solution Approach 2:
The load value broadcast by the base station acts as an intermediary information carrier, conveying network condition status to the terminal. This intermediary mechanism enables reliable RO selection while keeping the terminal's operational complexity low, as the terminal only needs to follow simple selection rules based on the received load value.
3Adaptability or versatility
If the system uses separate first and second ROs, then the adaptability to different load conditions is improved, but the loss of time increases due to potential additional selection delays
Solution Approach 1:
The patent segments RO resources into first ROs and second ROs with different characteristics, allowing adaptation to different load conditions. The segmentation enables the system to provide multiple access options without requiring complex real-time analysis at the terminal, as the selection rules based on load values are straightforward and quick to apply.
Data Source
AI summary
A method and a device for determining a random access channel occasion (RO) are provided. The method includes that: a terminal receives a load value, broadcasted by a base station, of a physical uplink shared channel (PUSCH) that has accessed the base station; and the terminal determines, according to the load value, a RO of the terminal accessing a network side.