PRS Subframe CP Length Configuration for LTE-A Signal Accuracy
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Solution Overview
Problem
In the LTE-Advanced system, the ambiguity in Cyclic Prefix (CP) length between PDSCH, CSI-RS, and Relay backhaul link transmissions causes incorrect signal detection and measurement due to conflicting CP lengths in MBSFN subframes, leading to inaccurate reception of signals by the receiving side.
Innovation Solution
The method involves configuring the network side to manage the CP length for PRS, CSI-RS, PDSCH, and Relay backhaul link transmissions based on specific conditions, ensuring that the receiving side can identify and correctly measure signals by receiving configuration information, and optionally discarding or prioritizing PRS or CSI-RS when they share resource elements with PDSCH or Relay backhaul link.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PRS is transmitted only in MBSFN subframe with Extended CP, then PRS measurement accuracy is improved, but PDSCH transmission reliability deteriorates due to CP length conflict with Normal CP requirement
Solution Approach 1:
The MBSFN subframe is segmented into Non-MBSFN domain and MBSFN domain, with different CP length configurations applied to different regions. The Non-MBSFN domain uses Normal CP for PDSCH transmission while the MBSFN domain uses Extended CP for PRS transmission, resolving the CP length conflict through spatial segmentation within the same subframe.
Solution Approach 2:
Different CP length configurations are applied to different domains within the MBSFN subframe. The Non-MBSFN domain is configured with Normal CP to support PDSCH transmission, while the MBSFN domain is configured with Extended CP to support PRS transmission. This local differentiation allows both PDSCH and PRS to coexist without CP length conflicts.
2Productivity
If PDSCH and PRS share the same MBSFN subframe, then resource utilization is improved, but signal detection accuracy deteriorates due to CP length ambiguity
Solution Approach 1:
The MBSFN subframe is divided into Non-MBSFN domain and MBSFN domain with distinct CP length configurations. PDSCH is transmitted in the Non-MBSFN domain using Normal CP, while PRS is transmitted in the MBSFN domain using Extended CP. This segmentation eliminates CP length ambiguity for each signal type while maintaining high resource utilization through coexistence in the same subframe.
Solution Approach 2:
Different CP length configurations are locally applied to different domains within the MBSFN subframe. The Non-MBSFN domain uses Normal CP for PDSCH while the MBSFN domain uses Extended CP for PRS. This local quality differentiation ensures that each signal type operates with its optimal CP length configuration, maintaining detection accuracy while improving resource utilization.
3Device complexity
If receiving side uses uniform Normal CP configuration for PDSCH, then device complexity is reduced, but measurement reliability deteriorates when PRS requires Extended CP
Solution Approach 1:
The receiving side processes the MBSFN subframe by segmenting it into Non-MBSFN domain and MBSFN domain. Normal CP is applied to the Non-MBSFN domain for PDSCH reception, while Extended CP is applied to the MBSFN domain for PRS reception. This segmentation approach maintains relatively simple device complexity while ensuring measurement reliability through appropriate CP length selection for each domain.
Solution Approach 2:
The receiving side applies different CP length configurations to different domains within the MBSFN subframe. Normal CP is used for PDSCH in the Non-MBSFN domain, while Extended CP is used for PRS in the MBSFN domain. This local quality approach ensures that each signal type is received with the optimal CP length configuration, maintaining measurement reliability without significantly increasing device complexity.
Data Source
AI summary
The disclosure claims a method and a device for transmitting a Position Reference Signal (PRS) subframe. In the disclosure, the network side configures certain channels or signals according to the configuration condition of the PRS, or the network side configures the PRS according to the configuration condition of certain channels or signals; the receiving side correctly identifies the length of Cyclic Prefix (CP) according to the configuration information issued by the network side, so as to correctly measure and accurately receive the channels or signals sent by the network side. The disclosure overcomes the technical problem in the conventional art that the length of CP is ambiguous, so that the signals cannot be measured and accurately received by the receiving side.