Buffer Status Report PDCP Buffer Size Threshold
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, the existing methods for transmitting buffer status reports (BSR) are inefficient as they often transmit unnecessary data, leading to waste of resources and increased power consumption, without adequate differentiation between PDCP and RLC buffer sizes, and lack conditions for optimized reporting.
Innovation Solution
A method where a user equipment (UE) triggers and transmits a buffer status report (BSR) including a packet data convergence protocol (PDCP) buffer size only if the PDCP BSR condition is met, which can be based on threshold, frequency, or time, allowing for separate reporting of PDCP and radio link control (RLC) buffer sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE transmits BSR including PDCP buffer size in all cases, then the network has complete buffer status information, but unnecessary data transmission occurs leading to resource waste and increased power consumption
Solution Approach 1:
The patent introduces a threshold parameter (e.g., sbsr-Threshold) for PDCP buffer size. When the PDCP buffer size exceeds this threshold, the UE includes PDCP buffer size in the BSR; otherwise, it excludes this information. This parameter-based conditional reporting resolves the contradiction by adapting the reporting content to actual buffer status, avoiding unnecessary transmissions when buffer size is small while ensuring complete information when buffer size is large.
2Measurement precision
If the UE transmits BSR including PDCP buffer size frequently, then the network has up-to-date buffer status information, but resource allocation efficiency decreases due to excessive transmissions
Solution Approach 1:
The patent introduces a frequency parameter (e.g., sbsr-Frequency) that controls how often PDCP buffer size is included in BSR transmissions. By adjusting this frequency parameter, the system balances between providing up-to-date buffer status information and avoiding excessive transmissions that would reduce resource allocation efficiency. The UE follows the network's frequency configuration to determine when to include PDCP buffer size in BSR.
3Reliability
If the UE transmits BSR including PDCP buffer size, then the network can make better scheduling decisions, but the complexity of BSR processing increases
Solution Approach 1:
The patent introduces a condition parameter (e.g., sbsr-Condition) that determines when PDCP buffer size should be included in BSR based on specific network conditions or buffer status thresholds. This conditional approach allows the network to receive comprehensive buffer status information only when necessary for accurate scheduling decisions, reducing unnecessary processing complexity during normal operations while maintaining scheduling accuracy when conditions warrant detailed reporting.
Data Source
AI summary
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for transmitting, by a user equipment (UE), a buffer status report (BSR) in a wireless communication system, the method comprising: triggering, by a medium access control (MAC) entity, a buffer status report (BSR); and transmitting the buffer status report, wherein the buffer status report includes a packet data convergence protocol (PDCP) buffer size for a radio bearer only if PDCP BSR condition is met.