Buffer Status Signaling for Licensed-Unlicensed Spectrum Offloading
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Solution Overview
Problem
Current communication networks face challenges in efficiently signaling buffer status information across licensed and unlicensed spectrums, particularly during traffic offloading, which affects resource allocation and battery life, especially in proximity-based applications and device-to-device (D2D) communications.
Innovation Solution
An apparatus and method that estimate the offloading value of traffic from licensed to unlicensed spectrums, determine buffer sizes, and transmit buffer status information to network control elements, enabling accurate resource allocation and management across both spectrums.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traffic offloading from licensed to unlicensed spectrum is implemented, then resource allocation efficiency is improved, but accurate buffer status signaling becomes more difficult
Solution Approach 1:
The patent segments buffer status reporting into two distinct parts: one for licensed spectrum and one for unlicensed spectrum. This allows the network to receive separate buffer status information for each spectrum type, enabling accurate resource allocation decisions while maintaining clear distinction between traffic that can be offloaded and traffic that must remain on licensed spectrum.
Solution Approach 2:
The patent introduces an intermediary mechanism where the UE reports buffer status for unlicensed spectrum traffic to the network controller. This intermediary reporting allows the network to make informed decisions about resource allocation and offloading without directly controlling unlicensed spectrum access, thus maintaining information accuracy while enabling efficient resource management.
2Speed
If direct message exchanges are used for discovery processes, then communication speed is improved, but battery life deteriorates
Solution Approach 1:
The patent implements periodic discovery messages instead of continuous direct exchanges. UEs transmit discovery messages at scheduled intervals, allowing proximity-based applications to function while significantly reducing the energy consumption compared to constant message exchanges. This periodic approach maintains discovery capability while preserving battery life.
3Adaptability or versatility
If unlicensed spectrum communication is used, then scalability is improved, but measurement precision of buffer status deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the network receives buffer status reports from UEs regarding unlicensed spectrum usage. This feedback loop allows the network to continuously monitor and adjust resource allocation based on actual buffer conditions, maintaining measurement precision despite the decentralized nature of unlicensed spectrum communication and enabling scalable operation.
Data Source
AI summary
There is provided a mechanism for reporting buffer status information to a communication network control element when transmission via both a licensed and an unlicensed spectrum is conducted and offloading of traffic is executed. After an offloading value indicating the amount of traffic which can be offloaded from a transmission over a licensed spectrum to a transmission over an unlicensed spectrum is estimated, the UE determines a buffer size of at least one transmission buffer used in a transmission over the licensed spectrum and the unlicensed spectrum. Then, buffer status information is sent to the eNB wherein the estimated offloading value is considered. The eNB can then allocate resources for the transmission over the licensed band while benefits by the offloading to the unlicensed band are considered in the resource allocation.