NR Buffer Status Reporting with Variable-Size MAC CE Selection
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing buffer status reporting (BSR) in New Radio (NR) networks, leading to suboptimal data transmission and reception due to inadequate mechanisms for handling varying traffic loads and packet sizes.
Innovation Solution
Implementing enhanced BSR mechanisms, including new BSR MAC CEs and delay status reporting, to provide more accurate and timely updates on buffer status, allowing for better resource allocation and management in NR networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional BSR mechanisms are used in NR networks, then device complexity is reduced, but data transmission efficiency deteriorates due to inadequate handling of varying traffic loads and packet sizes
Solution Approach 1:
The BSR mechanism is segmented into multiple types (Regular BSR, Periodic BSR, Retransmission BSR, Padding BSR) with different formats (Short BSR, Long BSR, Truncated BSR). Each segment handles specific traffic conditions and buffer scenarios, allowing the system to select the most appropriate BSR type based on current needs, thereby improving transmission efficiency without requiring a completely complex new mechanism.
Solution Approach 2:
The BSR mechanism dynamically adapts to varying traffic loads through configurable parameters including BSR triggering conditions, periodic intervals, and format selection based on buffer status. The network can dynamically adjust BSR behavior through RRC configuration, enabling the system to respond flexibly to changing traffic patterns while maintaining manageable complexity through standardized adaptation rules.
2Measurement precision
If enhanced BSR mechanisms with multiple formats are implemented, then measurement precision of buffer status is improved, but device complexity increases
Solution Approach 1:
Different BSR formats provide different levels of detail appropriate to local conditions: Short BSR provides concise buffer status for small buffers, Long BSR provides detailed per-logical-channel information for large buffers, and Truncated BSR provides partial information when resources are limited. This local quality approach ensures measurement precision matches the actual buffer status requirements without always incurring maximum complexity.
Solution Approach 2:
The system changes key parameters including BSR format selection (Short/Long/Truncated), triggering conditions (data arrival, periodic intervals, grant size thresholds), and reporting granularity based on buffer status and network conditions. These parameter changes enable precise buffer status measurement while managing complexity through conditional selection rather than always using the most detailed format.
3Loss of time
If BSR reporting frequency is increased, then information timeliness is improved, but use of energy increases due to more frequent transmissions
Solution Approach 1:
The BSR mechanism uses periodic reporting intervals configured by the network, where UEs transmit BSR at regular intervals when triggered. This periodic action ensures timely buffer status updates without continuous transmission, balancing timeliness with energy efficiency by allowing the UE to enter low-power states between periodic BSR opportunities.
Solution Approach 2:
The BSR mechanism implements feedback loops where UEs monitor buffer status changes, grant sizes, and periodic intervals to determine when BSR transmission is necessary. This feedback-based triggering ensures BSR is sent only when buffer status changes significantly or periodic conditions are met, improving timeliness of critical updates while avoiding unnecessary transmissions that would waste energy.
Data Source
AI summary
A wireless device receives a configuration parameter indicating whether the wireless device is allowed to use a first buffer size table, of a plurality of buffer size tables, for a first logical channel group (LCG) of a plurality of LCGs. The wireless device determines a second buffer status report (BSR) medium access control (MAC) control element (CE) with a second variable size, among a plurality of BSR MAC CES including a first BSR MAC CE, with a first variable size, and the second BSR MAC CE. Determining the second BSR MAC CE is based on: the configuration parameter; and an amount of data, of the first LCG, available for transmission, being greater than a buffer size threshold. The wireless device transmits the second BSR MAC CE based on determining the second BSR MAC CE.