On Demand System Information Triggering via Single RACH Transmission
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Solution Overview
Problem
Conventional techniques for requesting system information (SI) messages in wireless communications systems are inefficient, leading to increased latency and overhead when a user equipment (UE) needs to retrieve multiple SI messages, especially when configured with one random access channel (RACH) resource per SI message.
Innovation Solution
The described techniques allow a UE to efficiently request all or a threshold number of on-demand SI messages using a single RACH transmission or an additional resource, reducing the need for separate RACH procedures and transmissions by configuring the UE to use a single RACH resource for multiple SI messages or providing an additional resource for bulk requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a UE is configured with one RACH resource per SI message, then the UE can request individual SI messages, but the latency and overhead increase when requesting multiple SI messages
Solution Approach 1:
The patent combines multiple individual RACH resources into a single bulk RACH resource that can carry requests for multiple SI messages simultaneously. This merging approach allows the UE to request multiple SI messages in one transmission instead of sequentially using separate RACH resources for each message, thereby reducing latency and the number of random access procedures required.
Solution Approach 2:
The patent introduces a universal RACH resource that can serve multiple purposes: it can be used for bulk requests of multiple SI messages and also maintains compatibility with individual SI message requests. This multi-functional resource design provides versatility while optimizing performance for scenarios requiring multiple SI messages.
2Ease of operation
If a UE requests multiple SI messages using separate RACH procedures, then each message can be requested individually, but the signaling overhead increases
Solution Approach 1:
The patent merges multiple separate RACH procedures into a single bulk RACH procedure. By combining multiple individual request transmissions into one consolidated transmission, the patent reduces the total number of random access procedures and associated signaling messages, thereby reducing signaling overhead while maintaining the ability to request multiple SI messages.
3Adaptability or versatility
If conventional techniques are used for requesting SI messages, then the system maintains compatibility with existing protocols, but efficiency and data rates decrease
Solution Approach 1:
The patent introduces dynamic resource allocation where the UE can adaptively choose between individual RACH resources and bulk RACH resources based on the number of SI messages needed. This dynamic approach optimizes communication efficiency by selecting the most appropriate request method while maintaining compatibility with existing protocols through the preservation of individual request capabilities.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. For example, the described techniques provide for efficiently requesting all (or a threshold number of) system information (SI) messages that are on demand in a random access channel (RACH) procedure. In one example, a user equipment (UE) may transmit a request for all (or a threshold number of) SI messages in a radio resource control (RRC) connection request or message 3 RACH transmission even if the UE is configured with the option to request SI messages individually with one RACH resource per SI message. In another example, a UE may transmit a request for all (or a threshold number of) SI messages on an additional resource (e.g., RACH resource or other resource configured by a base station) when the UE is configured with the option to request SI messages individually with one RACH resource per SI message.