Dynamic RACH Frequency Index Allocation Under Bandwidth Reassignment
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Solution Overview
Problem
Conventional wireless networks experience RACH failures and poor user experience due to dynamic bandwidth changes caused by incumbent entities, leading to insufficient allocation of frequency index values for wireless connectivity.
Innovation Solution
A communication management resource dynamically reallocates frequency index values in response to changes in wireless bandwidth, ensuring each wireless base station receives unique combinations of RSI and frequency index values to optimize random-access channel usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed frequency index values are used in CBRS networks, then device complexity is reduced, but reliability deteriorates due to RACH failures when bandwidth changes occur
Solution Approach 1:
The patent implements dynamic frequency index value assignment where the gNB assigns different frequency index values from the MSG1 FS message based on the currently allocated bandwidth. When bandwidth changes occur due to incumbent activities or PAL providers, the system automatically adjusts the frequency index values used for RACH, ensuring continuous reliable operation without requiring fixed pre-configured values
Solution Approach 2:
The system changes the frequency index parameter dynamically based on bandwidth allocation conditions. The gNB monitors bandwidth changes and adjusts the frequency index values assigned to UEs accordingly, transforming the static parameter approach into a dynamic one that adapts to changing network conditions, thereby maintaining RACH reliability without increasing overall system complexity
2Reliability
If bandwidth is reduced due to incumbent entity usage, then spectrum sharing reliability is improved, but RACH accessibility deteriorates due to insufficient frequency index values
Solution Approach 1:
The gNB sends the MSG1 FS message containing multiple frequency index values (0, 12, 24, 36, 48, 60, 72, 84) in advance to all UEs before bandwidth changes occur. This preliminary provision of multiple possible frequency index values ensures that when bandwidth is later reduced, the UEs already have the necessary information to select appropriate values from the pre-provided set, maintaining RACH accessibility without compromising spectrum sharing reliability
3Reliability
If multiple frequency index values are allocated dynamically, then RACH reliability is improved, but device complexity increases at the gNB
Solution Approach 1:
The gNB implements an automatic self-service mechanism that monitors bandwidth allocation changes and autonomously adjusts the frequency index values assigned to UEs without requiring manual intervention or complex external coordination. The system uses the pre-sent MSG1 FS message values and automatically selects appropriate frequency indices based on current bandwidth conditions, improving RACH reliability while keeping the complexity increase minimal and localized to automated procedures
Data Source
AI summary
A system as discussed herein includes communication management hardware. The communication management hardware: receive notification of a change in wireless bandwidth allocated for use by a first wireless network, the change detected based on reassignment of second wireless bandwidth as a substitute to previously allocated first wireless bandwidth; in response to the notification of the change, produce configuration information indicating multiple frequency index values associated with use of a random-access channel; and distribute the configuration information to entities in the first wireless network.