PUCCH Resource Determination for LTE-Advanced ePDCCH Compatibility
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Solution Overview
Problem
The existing LTE systems face challenges in obtaining PUCCH resources for transmitting ACK/NACK information corresponding to the Enhanced PDCCH (ePDCCH), which hinders the normal operation of the HARQ process and compatibility between LTE-Advanced and LTE Release-8 systems.
Innovation Solution
A method and apparatus are provided to determine the channel resource index nPUCCH(1) of the PUCCH based on physical resources of the ePDCCH, utilizing physical resource blocks, enhanced Control Channel Elements (eCCEs), and antenna port indices, allowing for the calculation of an initial position and offset to configure the PUCCH resources effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If control signaling transmission resources are allocated in a non-localized manner in the first control signaling transmission region, then the existing LTE system can transmit control signaling, but the closed-loop precoding technology cannot be implemented and transmission performance is limited
Solution Approach 1:
The patent divides the control signaling transmission resources into two separate regions: the first control signaling transmission region (for legacy PDCCH) and the second control signaling transmission region (for ePDCCH with localized resources). This segmentation allows the second region to support localized resource allocation enabling closed-loop precoding, while the first region maintains backward compatibility with non-localized allocation.
Solution Approach 2:
The patent introduces a new dimension by creating a second control signaling transmission region in addition to the existing first region. This additional region provides localized time-frequency resources that enable closed-loop precoding technology, while the first region continues to support non-localized allocation for legacy compatibility.
2Productivity
If a new control channel region is developed to support localized resources and closed-loop precoding, then transmission capacity and user support are enhanced, but system complexity increases
Solution Approach 1:
The second control signaling transmission region is designed to be configurable with different resource allocation modes (localized and distributed) and can support multiple transmission modes (first and second transmission modes). This multi-functionality allows a single region to adapt to different system requirements without requiring separate dedicated regions for each mode.
Solution Approach 2:
The patent introduces dynamic configuration mechanisms where the base station can flexibly configure the second control signaling transmission region's resource allocation mode and transmission mode based on system conditions. This dynamic adaptability allows the system to optimize transmission capacity while managing complexity through flexible rather than fixed architecture.
3Reliability
If the second control signaling transmission region uses DMRS for demodulation to support precoding, then transmission robustness is improved, but compatibility with legacy systems without channel information is reduced
Solution Approach 1:
The patent segments the control signaling transmission into two regions with different characteristics: the first region uses legacy PDCCH with non-localized resources suitable for diversity transmission, while the second region uses ePDCCH with localized resources and DMRS for precoding. Each region can be independently configured and activated based on system needs, allowing selective use of robust precoding when available while maintaining legacy compatibility.
Solution Approach 2:
The patent enables parameter changes in the second control signaling transmission region, including configurable resource allocation modes and transmission modes. The base station can change these parameters dynamically to adapt between precoding-based robust transmission and legacy-compatible transmission, allowing the system to switch between different technical approaches based on current requirements.
Data Source
AI summary
A method and apparatus for determining resources in a Physical Uplink Control Channel (PUCCH) are disclosed. The method includes: an apparatus determining a channel resource index of the PUCCH according to physical resources of an enhanced Physical Downlink Control Channel (ePDCCH), wherein, the PUCCH is used for carrying positive acknowledgement/negative acknowledgement (ACK/NACK) information about a Physical Downlink Shared Channel (PDSCH) indicated by the ePDCCH; and the physical resources of the ePDCCH include: any one or more of a physical resource block, an enhanced control channel element and an antenna port index. The embodiments of the present document can ensure the compatibility between an LTE-Advanced system and an LTE Release-8 system, and facilitate improving the system capacity and the scheduling flexibility of the LTE-Advanced system, thereby enabling an LTE-Advanced terminal to obtain a maximum frequency selectivity gain.