User Equipment Buffer Status Report Skipping for Wireless Latency Reduction
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Solution Overview
Problem
In wireless communication systems, base stations face challenges in efficiently managing limited radio resources to reduce latency and improve data transmission efficiency due to increased numbers of user equipment (UEs) and higher data volumes, particularly in applications sensitive to delay and latency.
Innovation Solution
The method involves skipping the buffer status report (BSR) triggering procedure for specific logical channel groups and transmitting buffer size information based on an uplink grant, allowing for efficient data transmission regardless of available uplink data, and implementing advanced driver assistance systems (ADAS) functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If buffer status report (BSR) triggering procedure is performed for all logical channels, then the base station can obtain complete buffer status information, but unnecessary power consumption and reporting overhead increase
Solution Approach 1:
The patent segments logical channels into specific logical channel groups (LCGs) and normal LCGs. BSR triggering is selectively applied only to normal LCGs, while specific LCGs skip the triggering procedure. This segmentation allows the system to obtain buffer status information only where necessary, reducing unnecessary power consumption and reporting overhead while maintaining essential information flow.
Solution Approach 2:
Instead of performing BSR triggering for all logical channels (excessive action), the patent applies partial action by limiting BSR triggering only to normal LCGs. The specific LCGs rely on uplink grants for buffer size transmission without traditional BSR triggering, reducing overall system overhead and power consumption while maintaining adequate information flow for scheduling decisions.
2Loss of information
If traditional BSR triggering procedure is used, then buffer status is reported whenever data is available, but latency increases due to additional reporting steps
Solution Approach 1:
The patent configures uplink grants in advance for specific LCGs, allowing these channels to transmit buffer size information directly when data is available without waiting for BSR triggering procedures. This preliminary configuration of transmission resources eliminates the latency associated with traditional BSR triggering and reporting cycles, enabling faster information delivery to the base station.
Solution Approach 2:
For specific LCGs, the patent skips the traditional BSR triggering procedure entirely. Instead of following the conventional path of triggering → reporting → acknowledgment, these channels rush through to direct transmission using pre-configured uplink grants, significantly reducing latency for time-sensitive data while maintaining information flow.
3Loss of information
If buffer size information is transmitted for every logical channel, then complete resource allocation information is provided, but resource allocation efficiency decreases due to unnecessary reporting
Solution Approach 1:
The patent segments the buffer status reporting mechanism by LCG type. Normal LCGs follow traditional BSR reporting to provide complete information, while specific LCGs use streamlined uplink grant-based transmission. This segmentation improves overall resource allocation efficiency by eliminating redundant reporting for certain channel types while maintaining comprehensive information flow through the combination of both mechanisms.
Solution Approach 2:
The patent changes the reporting parameter mechanism for specific LCGs from event-triggered BSR to grant-based transmission. This parameter change in the reporting trigger condition eliminates unnecessary reporting overhead for certain channels, improving data transmission efficiency while the base station maintains adequate buffer status knowledge through the mixed reporting approach.
Data Source
AI summary
A method for transmitting signals by a user equipment (UE) in a wireless communication system is disclosed. The method comprises skipping buffer status report (BSR) triggering procedure when a logical channel belongs to a specific logical channel group; receiving an uplink grant allowed to be used for transmission of buffer size information of the specific logical channel group; and transmitting buffer size information of the specific logical channel group based on the uplink grant.