Truncated Buffer Status Report Logic for 5G Random Access

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Solution Overview

Problem

In wireless communication systems, particularly in 5G networks, efficient management of data transmission and reception is hindered by challenges in random access processes, especially when multiple terminals communicate with a base station, leading to potential failures and the need for reattempts, which can result in delays and reduced data buffer efficiency.

Innovation Solution

The method involves a user equipment (UE) and base station communicating through logical channel groups (LCGs) using truncated Buffer Status Reports (BSRs), where the UE determines whether to send a short or long BSR based on available padding bits and priority, allowing for optimized data transmission and reception by identifying available data and buffer sizes, thereby improving random access success rates and reducing reattempt delays.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a terminal reattempts random access after failure, then connection establishment may eventually succeed, but transmission delay increases and system efficiency deteriorates

Engineering Contradiction:

Improverandom access success rateVSAvoidtransmission delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The base station performs preliminary actions by pre-configuring multiple random access resources (preambles and time slots) for reattempt operations. When a random access failure is detected, the terminal can immediately use the pre-prepared reattempt resources without waiting for resource allocation, thereby reducing delay while maintaining reliable connection establishment

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system dynamically adjusts random access parameters based on failure detection. The base station monitors random access outcomes and dynamically allocates specific reattempt resources to terminals that failed, adapting the resource allocation in real-time to maintain high success rates while minimizing unnecessary resource usage and delay

Inventive Principle:

Principle #15Dynamics

2Productivity

If multiple terminals perform random access simultaneously, then system capacity and throughput increase, but random access failure rate increases due to resource conflicts

Engineering Contradiction:

Improvesystem throughputVSAvoidrandom access success rate

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The base station segments the random access resource pool into multiple groups: initial access resources and reattempt resources. This segmentation allows simultaneous handling of new access requests and reattempt requests without interference, maintaining system capacity while reducing failure rates caused by resource conflicts

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The base station acts as an intermediary that mediates between multiple terminals attempting random access. It monitors the access process, detects failures, and coordinates reattempt resource allocation, preventing resource conflicts while maintaining high system throughput and access success rates

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If truncated BSR is used to report buffer status, then uplink resource utilization efficiency improves, but information completeness may be compromised

Engineering Contradiction:

Improveuplink resource utilization efficiencyVSAvoidbuffer status information completeness

Core Design Contradiction:

ProductivityVSLoss of information

Solution Approach 1:

The system uses partial action by transmitting truncated BSR that includes only the most critical buffer status information (highest priority LCG) when padding bits are limited. This partial reporting achieves efficient resource utilization while the base station can infer or request additional information as needed, balancing completeness with efficiency

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The system changes the BSR transmission parameter (truncation level) based on available padding bits. When padding bits are sufficient, complete BSR is transmitted; when padding bits are limited, truncated BSR with priority-based selection is used. This dynamic parameter adjustment optimizes resource utilization while managing information completeness

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11778507B2Method and device for transmitting and receiving data in wireless communication system

Publication Date: 2023.10.03 SAMSUNG ELECTRONICS CO LTD

AI summary

Disclosed is a 5G or pre-5G communication system for supporting a data transmission rate higher than that of a 4G communication system such as long term evolution (LTE). Disclosed is a method by which a terminal transmits a buffer status report (BSR) in a communication system, including allocating an uplink resource from a base station; comparing the number of padding bits with a value obtained by summing the size of the BSR and the size of a sub-header of the BSR; and transmitting, to the base station according to the comparison result, the BSR including information indicating the presence or absence of a field representing a buffer size for at least one logical channel group (LCG).