Subframe Resource Allocation for LTE-LTE-A Coexistence
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Solution Overview
Problem
The challenge in developing a radio resource allocation method for a subframe in wireless communication systems is ensuring backward compatibility with existing LTE systems while supporting advanced features like MIMO and relay nodes in LTE-A, which requires a new subframe structure that allows both LTE and LTE-A devices to operate seamlessly.
Innovation Solution
The proposed solution involves allocating a subframe into three zones: a first control zone for LTE devices using a first RAT, a second control zone for LTE-A devices using a second RAT, and a data zone for data transmission, with specific allocation of control channels and reference signals to maintain compatibility and support advanced features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a new subframe structure is designed for LTE-A to support advanced features like MIMO and relay nodes, then the system can support improved techniques and higher data transfer rates, but existing LTE terminals and networks cannot operate in the new system
Solution Approach 1:
The subframe is divided into multiple control zones (first control zone for LTE, second control zone for LTE-A) and data zones, allowing different RAT types to coexist within the same subframe structure. This segmentation enables LTE-A devices to access advanced features while LTE devices continue to operate using only the first control zone and data zone, maintaining backward compatibility.
2Adaptability or versatility
If control channels for both LTE and LTE-A are allocated in the same subframe, then both RAT types can operate simultaneously, but the subframe structure becomes complex and resource allocation becomes difficult
Solution Approach 1:
The subframe is segmented into distinct control zones and data zones with clearly defined boundaries. The first control zone contains LTE control channels (PDCCH, PCFICH, PHICH), while the second control zone contains LTE-A control channels. This segmentation simplifies resource allocation by providing dedicated regions for each RAT type, reducing interference and making scheduling more manageable despite supporting multiple RATs.
Solution Approach 2:
Control channels for different RAT types are allocated in the time domain dimension rather than only in frequency domain. By placing LTE and LTE-A control channels in different time slots (first control zone vs. second control zone), the system reduces frequency resource conflicts and simplifies the overall resource allocation structure while maintaining multi-RAT support.
Data Source
AI summary
The method for wireless resource subframe allocation comprises the following steps: allocation of the control channel based on the first RAT (Radio Access Technology) of the first control domain, which includes the OFDM symbol of the first number from the sub-frame containing multiple OFDM symbols and multiple subcarriers in the frequency domain; allocation of the control channel based on the second RAT of the second control domain including the OFDM symbol of the second number which follows said first control domain; and the allocation of a data channel in the data domain which includes the OFDM symbols positioned outside said first control domain and second control domain. This invention provides a sub-frame structure which is compatible with existing wireless communication systems. This method allows the continued use of existing control channel systems or base signal structures. The method is also capable of supporting advanced features.