Base Station Uplink Grant Prioritization for Group Delay Variation
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Solution Overview
Problem
In cellular wireless networks, group delay variation (GDV) across different frequency bands leads to signal distortions and service degradation, particularly affecting uplink transmissions, as UEs camped on high GDV channels face increased latency and error rates due to contention on the random access channel, without prior accounting for their disadvantaged conditions.
Innovation Solution
A method and system in a base station that prioritizes uplink channel grants for UEs camped on frequency bands more susceptible to group delay variation impairments, by determining the GDV characteristics of each UE's assigned frequency band and allocating channel access accordingly within a threshold time interval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UEs are assigned to frequency bands with high group delay variation, then the network can utilize more frequency resources, but uplink transmission reliability deteriorates due to signal distortions and increased latency
Solution Approach 1:
The patent applies local quality by differentiating treatment based on the specific frequency band characteristics. The base station identifies which frequency bands have high GDV and applies prioritization only to UEs assigned to those specific bands, rather than treating all UEs uniformly. This allows the system to maintain high frequency resource utilization while providing targeted compensation for the reliability issues in specific frequency regions.
Solution Approach 2:
The patent changes the channel grant allocation parameter based on GDV characteristics. By monitoring and evaluating GDV parameters of different frequency bands, the base station adjusts the prioritization level of uplink channel grants dynamically. This parameter change enables the system to adapt to varying frequency conditions and maintain transmission reliability without sacrificing frequency resource utilization.
2Reliability
If the base station prioritizes uplink channel grants for high GDV frequency bands, then uplink transmission success rate improves, but channel allocation complexity increases
Solution Approach 1:
The patent applies preliminary action by having the base station pre-identify and pre-configure prioritization rules for high GDV frequency bands before actual transmission occurs. The base station evaluates GDV characteristics in advance and establishes prioritization policies beforehand, so that during actual channel allocation, the base station simply needs to apply pre-determined rules rather than performing complex real-time calculations. This reduces operational complexity while maintaining high transmission success rates.
3Loss of time
If the base station implements GDV-based prioritization, then latency for high GDV UEs reduces, but processing time for channel allocation increases
Solution Approach 1:
The patent applies local quality by implementing prioritization only for UEs in high GDV frequency bands, leaving standard allocation procedures unchanged for other bands. This localized approach ensures that GDV-based processing is performed only when necessary, minimizing overall processing time while significantly reducing latency for affected UEs. The base station can quickly identify high GDV bands and apply prioritization only to relevant UEs, avoiding unnecessary processing for the majority of UEs on stable frequency bands.
Data Source
AI summary
Systems and methods are disclosed for prioritizing uplink grants to mobile devices based on group delay variation considerations. A base station may receive (i) a first random access channel (RAC) request from a first user equipment device (UE) assigned to operate in a first frequency band of a wireless communication network and (ii) a second RAC request from a second UE assigned to operate in a different, second frequency band of the wireless communication network, both request being for uplink communications. Upon determining that the first frequency band is more susceptible to group delay variation based impairments than the second frequency band, the base station prioritizes an uplink channel grant of the first RAC request over an uplink channel grant of the second RAC request.