Cell Reselection Priority Control for 5G Unlicensed Spectrum
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Solution Overview
Problem
Current cell selection and reselection techniques in wireless communication networks, particularly for 5G NR, lack flexibility and efficiency in handling unlicensed spectrum challenges such as contention, PCI collisions, and PLMN identification, leading to increased time and power consumption in finding suitable cells.
Innovation Solution
Implementing techniques that adjust selection probabilities and priorities of candidate cells based on contention conditions, broadcasted offset values, and instruction signals to optimize cell selection and reselection processes, including handling PCI collisions and PLMN identification efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current cell selection/reselection techniques are used in unlicensed spectrum, then basic cell access is achieved, but time and power consumption increase due to contention and PCI collisions
Solution Approach 1:
The network broadcasts offset values and instruction signals in advance before cell selection/reselection occurs. These preliminary indications prepare the UE by providing advance information about contention conditions, PCI collision risks, and PLMN identification requirements, allowing the UE to make more informed cell selection decisions without excessive time consumption during the actual selection process
Solution Approach 2:
The system implements feedback mechanisms where the network provides offset values based on observed contention conditions and PCI collision patterns. These offset values are fed back to UEs to adjust their cell selection behavior, creating a closed-loop system that continuously optimizes cell selection performance based on network conditions
2Reliability
If current cell selection/reselection techniques are used in unlicensed spectrum, then basic cell access is achieved, but power consumption increases due to extended search and monitoring periods
Solution Approach 1:
The network provides preliminary indications including offset values and instruction signals before the UE performs cell selection/reselection. This advance information allows the UE to efficiently identify suitable cells without extended searching, reducing the time the UE's radio needs to be active and thereby reducing power consumption
Solution Approach 2:
The system changes selection parameters dynamically by providing offset values that adjust cell selection criteria based on current network conditions. This allows UEs to adapt their selection behavior to favor cells with lower contention and better accessibility, improving success rates while reducing the energy expended in repeated selection attempts
3Adaptability or versatility
If traditional cell selection methods are used, then simple cell access is possible, but flexibility is insufficient to accommodate 5G NR requirements
Solution Approach 1:
The patent introduces intermediary elements including offset values and instruction signals that mediate between the network's cell selection requirements and the UE's selection process. These intermediaries carry encoded information about contention conditions, PCI collision risks, and PLMN identification needs, providing flexibility without requiring complex direct communication between network and UE
Solution Approach 2:
The system achieves flexibility by dynamically changing selection parameters through broadcast offset values. These parameters can be adjusted to accommodate different 5G NR scenarios, frequency bands, and network conditions without requiring changes to the fundamental cell selection procedure, thus maintaining simplicity while enhancing adaptability
Data Source
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AI summary
This disclosure relates generally to wireless communications. In one embodiment, a method performed by a communication device includes: receiving information from a first communication node; and decreasing a probability of selecting a second communication node, in communication node selection or reselection, in response to the information indicating a condition.