RACH Preamble Grant Size Indication for Latency Reduction
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Solution Overview
Problem
High-propagation-delay wireless communication systems experience increased latency and variability in network characteristics due to integration of new cellular base stations, leading to a degraded user experience, particularly in non-terrestrial networks with larger geographic coverage areas.
Innovation Solution
A wireless device configures a random access initiation message to request a specific uplink grant size based on the base station type and propagation delay, allowing for immediate allocation of resources sufficient for uplink data transmission, thereby reducing latency and smoothing signal flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a wireless device uses traditional random access procedures in high-propagation-delay networks, then the base station can receive the random access initiation message, but the latency between grant request and uplink data transmission increases significantly
Solution Approach 1:
The patent applies preliminary action by having the wireless device indicate the desired uplink grant size in advance within the random access initiation message (Msg1). This allows the base station to prepare and allocate the appropriate uplink resources immediately upon receiving the indication, eliminating the need for subsequent grant requests and reducing latency in high-propagation-delay networks.
2Device complexity
If the uplink grant size is fixed for all random access messages, then the base station simplifies resource allocation, but networks with varying propagation delays experience inefficiency and burstiness
Solution Approach 1:
The patent implements dynamics by enabling the uplink grant size to be dynamically adjusted based on the indication provided by the wireless device in the random access initiation message. The base station receives the grant size indication and allocates resources accordingly, allowing the system to adapt to different propagation delays and traffic conditions while maintaining consistent network performance.
3Productivity
If the wireless device requests a larger uplink grant to accommodate potential data transmission, then immediate data transmission becomes possible, but resources are wasted when less data needs to be transmitted
Solution Approach 1:
The patent applies parameter changes by allowing the wireless device to dynamically indicate the required uplink grant size based on its actual data buffer status. The device changes the grant size parameter in the random access initiation message to match its transmission needs, enabling immediate data transmission when necessary while avoiding resource waste when less data needs to be sent.
Data Source
AI summary
This disclosure relates to techniques for reducing latency in a high-propagation-delay wireless communication system. A user equipment device (UE) may transmit to a base station a random access initiation message, having a characteristic that is configured to indicate to the base station a requested size of a subsequent uplink grant to be provided by the base station for transmission of uplink data by the UE. For example, the characteristic may include a predetermined preamble included in the random access initiation message, such that a requested grant size is indicated by which preamble the UE selects from a plurality of possible preambles. As another example, the characteristic may include which RACH occasion is selected by the UE to transmit the random access initiation message. In response, the base station may allocate resources for use by the UE based on the characteristic.