Uplink Scheduling Requests With Embedded Buffer Status Signaling
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Solution Overview
Problem
Existing wireless communication systems face delays in uplink data transmission due to the need for separate scheduling requests and buffer status reports, which are problematic for low-latency applications like extended reality, leading to delays of at least 10 milliseconds.
Innovation Solution
Enhanced scheduling request (SR) and buffer status report (BSR) communications are introduced to rapidly provide uplink grants, allowing for BSR on SR resources and multiplexing between SR and initial BSR indications, reducing the time required for obtaining an uplink grant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate scheduling requests and buffer status reports are used for uplink data transmission, then the system maintains reliable resource allocation and buffer status monitoring, but the transmission latency increases to at least 10 milliseconds
Solution Approach 1:
The patent combines the scheduling request (SR) and buffer status report (BSR) into a single uplink transmission. The BSR is multiplexed with the SR on the same physical uplink control channel (PUCCH) resources, eliminating the need for separate transmissions. This merging reduces the total time required for buffer status indication and scheduling request from multiple sequential transmissions to a single combined transmission, thereby reducing latency while maintaining reliable resource allocation.
Solution Approach 2:
The patent enables the scheduling request resources to serve dual purposes: both carrying the scheduling request indication and carrying the buffer status report. By making the SR resources universal and capable of carrying both types of information simultaneously, the system eliminates the need for dedicated separate resources for BSR, reducing the number of transmission steps and associated latency while maintaining full functionality for both scheduling requests and buffer status monitoring.
2Measurement precision
If separate BSR communications are transmitted independently from scheduling requests, then the system ensures accurate buffer status reporting, but the time required to obtain uplink grants increases
Solution Approach 1:
The patent merges the BSR transmission with the SR transmission by multiplexing the BSR indication with the SR on the same PUCCH resources. The BSR information is embedded within the SR transmission framework, allowing the network to receive both the scheduling request and buffer status information simultaneously in a single transmission event, thus reducing the time to obtain uplink grants while preserving accurate buffer status reporting.
Solution Approach 2:
The patent performs the BSR indication in advance as part of the SR transmission, so that when the network receives the SR, it already has the buffer status information needed to make scheduling decisions. This preliminary inclusion of BSR information eliminates the need for subsequent separate BSR transmissions, allowing the network to immediately process both the scheduling request and buffer status and issue uplink grants without delay.
Data Source
AI summary
Aspects of the disclosure are directed to an apparatus configured for wireless communication. In certain aspects, the apparatus is configured to generate data (e.g., generate uplink data and store the data in a buffer until uplink resources are granted for transmission of the data). In certain aspects, the apparatus is configured to transmit, to a network node, a scheduling request (SR) comprising an indication of a size of the generated data, wherein the indication of the size of the generated data is configured to indicate whether the size of the generated data is greater than or equal to a threshold value, or less than or equal to the threshold value.