Simultaneous RRC Signaling for LTE Handover Reliability
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Solution Overview
Problem
In LTE wireless networks, handover command signaling reliability is compromised due to low Signal-to-Noise and Interference Ratio (SINR) at cell edges, particularly during high mobility scenarios, leading to high failure rates and prolonged interruptions.
Innovation Solution
Implementing a technique where multiple intra-eNB cells transmit RRC messages simultaneously using the same channel coding, allowing the user equipment to combine these messages and improve SINR, while utilizing channel quality information for frequency domain scheduling to optimize signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple intra-eNB cells transmit RRC messages simultaneously using the same channel coding, then the reliability of handover command signaling is improved, but the device complexity increases
Solution Approach 1:
Multiple intra-eNB cells merge their RRC message transmissions by using the same channel coding and coordinating their transmissions simultaneously. This combining approach allows the user equipment to receive reinforced signals from multiple cells, improving the reliability of handover command signaling while managing complexity through standardized coordination procedures.
2Reliability
If simultaneous transmission is used to improve SINR, then the received signal quality increases, but the inter-cell interference increases
Solution Approach 1:
The patent applies local quality by differentiating transmission strategies between intra-eNB cells and other cells. Intra-eNB cells transmit simultaneously with coordinated channel coding to improve local signal quality at the user equipment, while other cells transmit normally. This localized approach enhances received signal quality without causing widespread inter-cell interference.
3Productivity
If frequency domain scheduling is used to optimize signal transmission, then the transmission efficiency is improved, but the scheduling complexity increases
Solution Approach 1:
The patent implements preliminary action by having the user equipment measure and report channel quality information before the actual RRC message transmission. The eNB uses these pre-collected measurements to perform frequency domain scheduling, determining which intra-eNB cells should transmit simultaneously. This preliminary measurement and reporting phase simplifies the actual transmission scheduling by providing advance channel state information.
Data Source
AI summary
Methods, apparatus and computer program products perform signal quality measurements for signals from a plurality of cells served by an apparatus, and transmit indications of the signal quality measurements to the apparatus. The signal quality measurements may include CQI measurements. Transmitting may include transmitting indications of the signal quality measurements to a source cell of the apparatus. Other methods, apparatus and computer program products perform signal quality measurements for signals from a plurality of cells served by an apparatus, determine, using at least the signal quality measurements, a frequency band to be used by each of the plurality of cells to transmit a command, and transmit an indication of the frequency band to the apparatus. Variants may include receiving over the frequency band the command from each of the plurality of cells.