Buffer Status Report Transmission in LTE and NR Networks
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Solution Overview
Problem
User devices face challenges in accurately determining the availability of uplink shared channel resources for transmitting buffer status reports, leading to potential false triggering of scheduling requests due to uncertainties in transmission time intervals and resource allocation.
Innovation Solution
A method that involves receiving a configuration message from a base station, determining uplink resource allocation indication information, estimating the duration of available uplink shared channel resources based on provided time intervals, and sending a buffer status report when such resources are available, while also considering the prioritization of logical channels and processing times to avoid unnecessary scheduling requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the user device uses different criterions for determining immediately-available uplink shared channel resources, then the determination process becomes simpler, but the accuracy of determining available resources deteriorates
Solution Approach 1:
The patent applies parameter changes by using a fixed time interval (e.g., 1 TTI) as a measurable parameter to determine resource availability, replacing vague temporal criterions with a concrete time-based parameter that can be consistently applied and measured
2Device complexity
If the user device determines resource availability in a next TTI, then the determination process becomes more structured, but the ability to accurately count symbols deteriorates due to TTI variability
Solution Approach 1:
The patent introduces an intermediary parameter (time interval in milliseconds or fixed TTI units) that mediates between the variable TTI structure and the need for precise symbol counting, allowing accurate resource availability determination without directly counting variable numbers of symbols
3Reliability
If the user device triggers a scheduling request to request uplink shared channel resources, then the reliability of sending buffer status report improves, but the loss of time increases due to additional waiting
Solution Approach 1:
The patent applies preliminary action by pre-determining and preparing uplink shared channel resources before the buffer status report trigger occurs, allowing the device to immediately use prepared resources when needed without triggering additional scheduling requests and waiting periods
Data Source
AI summary
The disclosure relates to a buffer status report transmitting method, including: receiving a configuration message sent by a base station; determining uplink resource allocation indication information sent by the base station and an uplink transmission time interval corresponding to the information based on the configuration message; determining an estimated duration based on the time interval; determining whether there is an uplink shared channel resource available in an uplink transmission opportunity within the estimated duration from the buffer status report trigger time or the time of the physical downlink control channel; sending a buffer status report to the base station if there is an uplink shared channel resource available in the uplink transmission opportunity. According to an example of the present disclosure, it may be avoided that the user device cannot transmit the buffer status report to the base station because the available uplink shared channel resources cannot be determined.