LTE-U Resource Reservation via Preliminary Transmission Bits
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increasing demand for high-speed voice and data communication in cellular networks is hindered by the exhaustion of licensed spectrum, particularly in low-frequency bands, and the unlicensed LTE-U spectrum is often occupied by other communication techniques like Wi-Fi, leading to interference and potential blocking of radio resources for LTE-U data transmissions.
Innovation Solution
A communication device transmits a plurality of bits before the actual LTE-U data transmission to secure radio resources by synchronizing with the start time of an LTE subframe, preventing other devices from using these resources and including information for detection, duration, and channel estimation to facilitate successful LTE-U data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If LTE-U data transmission is performed in unlicensed spectrum, then spectrum capacity is augmented, but radio resources may be blocked by other communication devices like Wi-Fi
Solution Approach 1:
The patent applies preliminary action by transmitting a plurality of bits before the actual LTE-U data transmission to reserve the radio resource. These preliminary bits are sent in advance to secure the time-frequency resource, preventing other devices from occupying it, thereby ensuring that the LTE-U transmission can proceed without interference while maintaining high spectrum utilization.
2Reliability
If a plurality of bits is transmitted before LTE-U data transmission to secure radio resources, then resource blocking by other devices is mitigated, but transmission time and complexity increase
Solution Approach 1:
The patent applies partial action by transmitting only a plurality of bits (not full data) before the actual LTE-U transmission. These bits contain essential information for resource reservation and detection, providing sufficient protection against resource blocking while minimizing the additional time overhead compared to transmitting complete preliminary data.
Solution Approach 2:
The patent changes the parameter of transmission structure by introducing a two-stage transmission format: first transmitting a plurality of bits with specific properties (detectable by receiving devices), then followed by the actual data transmission. This parameter change enables resource reservation without requiring full-duplex simultaneous transmission, thus reducing time loss.
3Measurement precision
If information is included in the plurality of bits for detection and channel estimation, then demodulation accuracy is improved, but signal complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the transmission into two parts: first a plurality of bits containing detection and channel estimation information, then the actual data transmission. This segmentation allows receiving devices to process the preliminary bits separately for resource detection and channel estimation, improving detection accuracy without requiring complex simultaneous processing of all signals.
Solution Approach 2:
The patent uses preliminary action by providing channel estimation information and detection signals in advance within the plurality of bits. This allows receiving devices to prepare their demodulation parameters beforehand, improving measurement precision while keeping the actual data transmission simple and efficient.
Data Source
AI summary
A method for securing radio resources for a Long Term Evolution-unlicensed, LTE-U, data transmission is disclosed. The method includes transmitting a plurality of bits in an unlicensed frequency band which are inserted before the LTE-U data transmission. Related communication devices, methods by devices, and systems are disclosed.