Dynamic RACH Occasion Switching for Wireless Congestion
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Solution Overview
Problem
Current wireless communication systems face congestion issues due to multiple user equipment (UEs) accessing the network using the same random access channel (RACH) occasions, leading to communication failures and network overload, especially in scenarios like IoT deployments where many UEs attempt to communicate simultaneously.
Innovation Solution
Implementing dynamic random access channel (RACH) occasion switching, where base stations can instruct UEs to switch from a congested set of RACH occasions to a less congested set, either by explicit instruction or through pre-configured patterns, to manage beam congestion and avoid network overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple UEs use the same RACH occasions for network access, then access simplicity is maintained, but network congestion increases and communication reliability deteriorates
Solution Approach 1:
The patent implements dynamic RACH occasion switching where UEs can be instructed to switch between different sets of RACH occasions based on real-time network conditions. The base station receives reports from UEs about successful beam communications and dynamically switches between first and second sets of RACH occasions, transforming a static access system into a dynamic one that adapts to congestion conditions while maintaining operational simplicity.
2Device complexity
If UEs persist in using the same RACH occasions during congestion, then access procedure simplicity is maintained, but communication failures increase
Solution Approach 1:
The patent implements a feedback mechanism where UEs report to the base station whether their initial beam communication was successful. The base station uses this feedback information to determine which RACH occasions to switch between. This feedback loop enables the system to learn from communication outcomes and adjust RACH occasion selection accordingly, improving communication success rates without significantly increasing procedure complexity.
Solution Approach 2:
The patent configures multiple sets of RACH occasions in advance (first set and second set) before actual communication occurs. The base station pre-establishes these alternative occasions and switches between them based on congestion conditions, allowing UEs to have pre-prepared access paths ready before communication failures occur, thus maintaining simplicity while improving reliability.
3Productivity
If the base station switches between multiple RACH occasion sets, then network congestion is reduced, but control complexity increases
Solution Approach 1:
The patent segments RACH occasions into distinct first set and second set, each associated with different beams. This segmentation allows the base station to manage congestion by switching between discrete, well-defined sets rather than managing a single large complex space. The segmentation simplifies the control logic while enabling effective congestion mitigation and improving network throughput.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may receive information indicating a switch from using a first set of random access channel (RACH) occasions (ROs) for physical RACH (PRACH) communications to using a second set of ROs for the PRACH communications; and transmit a PRACH communication using an RO, of the second set of ROs, based at least in part on receiving the information indicating the switch. Numerous other aspects are provided.