Semi-Backward Compatible Carrier for LTE Spectrum Flexibility
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Solution Overview
Problem
Existing LTE technologies lack efficient methods for flexible spectrum usage, interference management, and energy saving, particularly in heterogeneous networks, due to limitations in carrier aggregation and control/reference signal transmission.
Innovation Solution
The introduction of a 'semi-backward compatible carrier' (SBCC) framework, which defines a carrier segment with contiguous bandwidth extensions and UE-specific channels, allowing for flexible bandwidth allocation and reduced control/reference signal transmission, enabling efficient spectrum usage and interference management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If carrier aggregation is used to expand bandwidth, then spectrum usage flexibility is improved, but control and reference signal overhead increases
Solution Approach 1:
The patent divides the carrier into two distinct segments: a backward compatible carrier segment that maintains traditional LTE structure with full control and reference signals, and a non-backward compatible carrier segment that eliminates these overhead signals. This segmentation allows the system to aggregate carriers with different characteristics, achieving spectrum flexibility while reducing overall overhead by utilizing the non-compatible segment for data-only transmission.
2Reliability
If cell specific transmission is used for interference coordination, then network coverage is maintained, but energy consumption increases due to unnecessary control and reference signals
Solution Approach 1:
The patent applies different transmission qualities to different carrier segments. The backward compatible segment maintains full cell-specific transmission for coverage and reliability, while the non-backward compatible segment uses UE-specific transmission that eliminates unnecessary control and reference signals. This local differentiation allows energy savings in the non-compatible segment while maintaining network coverage through the compatible segment.
3Productivity
If non-backward compatible carrier segments are introduced, then spectral efficiency is improved, but device complexity increases
Solution Approach 1:
The patent enables dynamic operation where carrier segments can be configured and activated based on UE capabilities and network conditions. The system can adaptively switch between backward compatible and non-backward compatible modes, allowing UEs to operate in the more efficient non-compatible mode when supported, while maintaining compatibility with legacy UEs through the backward compatible segment. This dynamic approach allows spectral efficiency improvements without permanently increasing device complexity for all UEs.
Data Source
AI summary
A method for transmitting and receiving a carrier segment in a wireless communications system, including a base station and a user equipment, is disclosed. The carrier segment includes a first band having a first bandwidth and a second band having a second bandwidth, wherein a first segment gap is disposed in a frequency domain between the first band and the second band.