Base Station Supplemental BSR Procedures for High-Propagation-Delay Networks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-propagation-delay wireless communication systems experience degraded user experience due to increased and variable propagation delays, especially with the integration of new cellular base stations or repeater stations, leading to latency issues and burstiness in data transmission.
Innovation Solution
A base station configures resources for user equipment (UE) based on buffer status reports (BSR) and updates, providing an initial uplink data grant promptly and allowing BSR update messages before timer expiration to optimize data transmission in high-propagation-delay networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If new cellular base stations or repeater stations are integrated into the network, then network coverage and capacity are improved, but propagation delays increase and become more variable
Solution Approach 1:
The base station sends an initial uplink data grant to the UE before receiving the BSR message. This preliminary action allows the UE to start transmitting uplink data earlier, compensating for the increased propagation delay inherent in extended network coverage areas. The grant is sent based on buffer status information already available at the base station, enabling data transmission to begin while awaiting the formal BSR confirmation.
2Device complexity
If traditional BSR procedures are used in high-propagation-delay networks, then protocol simplicity is maintained, but latency increases and data transmission efficiency decreases
Solution Approach 1:
The base station transmits the initial uplink data grant before receiving the BSR message, performing the resource allocation action in advance. This reorders the traditional sequence where BSR must be received and processed first, thereby reducing the overall latency without requiring complex protocol modifications.
Solution Approach 2:
The system dynamically adjusts the resource allocation timing based on the propagation delay characteristics of the network. In high-propagation-delay scenarios, the base station sends the grant earlier in the procedure, while maintaining compatibility with traditional procedures in low-delay networks, thus adapting the protocol behavior to network conditions.
3Manufacturing precision
If the base station waits for BSR confirmation before allocating resources, then resource allocation accuracy is improved, but transmission latency increases
Solution Approach 1:
The base station uses buffer status information available at the time of sending the initial grant to allocate resources preliminarily. This preliminary allocation is then confirmed and adjusted based on the formal BSR message, achieving both low latency through early allocation and high accuracy through subsequent confirmation.
Solution Approach 2:
The base station performs partial resource allocation based on available information before receiving complete BSR confirmation. The initial grant allocates sufficient resources to start transmission immediately, and the subsequent BSR processing allows for optimization and adjustment of the resource allocation, ensuring accuracy without compromising initial transmission timing.
Data Source
AI summary
This disclosure relates to techniques for reducing latency in a high-propagation-delay wireless communication system. A base station (BS) may receive from a user equipment (UE) a first buffer status report (BSR) indicating an amount of uplink data buffered by the UE for transmission to the BS, and may subsequently receive a first BSR update message indicating that an additional amount of uplink data has been buffered by the UE subsequent to transmission of the first BSR. The first BSR update message may be received prior to expiration of a timer authorizing transmission of a second BSR following the first BSR. In response, the BS may allocate resources for transmission to the UE, based on the first BSR and the first BSR update message. The BS may provide an uplink grant identifying the allocated resources.