D2D Communication CP Length Coexistence Configuration
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Solution Overview
Problem
The coexistence of D2D signals with different CP lengths in D2D communication systems leads to inter-symbol interference, hindering normal communication and resource utilization, as existing technologies have not effectively addressed the challenge of managing diverse CP configurations in a shared air interface.
Innovation Solution
The proposed solution involves configuring specific CP formats for different resource subsets and notifying these configurations to D2D transmission and reception devices, allowing for the allocation of unique CP lengths to D2D channels, subframes, or mixed subframes using TDM, FDM, or TDM&FDM methods, ensuring compatible CP formats for transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D signals with different CP lengths coexist in the same air interface, then resource utilization and space reuse efficiency are improved, but inter-symbol interference occurs leading to communication failure
Solution Approach 1:
The resource pool is segmented into multiple resource subsets, where each subset is dedicated to a specific CP format (long CP or normal CP). This segmentation prevents different CP formats from interfering with each other while still allowing both formats to coexist in the system, thus maintaining resource utilization without causing inter-symbol interference.
Solution Approach 2:
Different resource subsets are assigned different CP format characteristics tailored to their specific needs. By locally optimizing the CP format for each resource subset based on channel conditions and service requirements, the system achieves both high resource utilization and reliable communication without universal interference.
2Productivity
If multiple CP formats are multiplexed in the same subframe, then resource efficiency is enhanced, but interference management complexity increases
Solution Approach 1:
The time-frequency resources within a subframe are segmented into distinct resource subsets, each dedicated to a specific CP format. This segmentation simplifies interference management by preventing different CP formats from occupying the same resources, thus maintaining resource efficiency without increasing management complexity.
Solution Approach 2:
The system dynamically changes the CP format parameter for different resource subsets based on channel conditions and service requirements. By adjusting this key parameter locally rather than universally, the system achieves efficient resource utilization while keeping interference management tractable through localized parameter optimization.
3Device complexity
If a unified CP format is used across all D2D channels, then system simplicity is maintained, but adaptability to different channel conditions is reduced
Solution Approach 1:
The system segments resources into multiple subsets, each with its own CP format configuration. This segmentation allows the system to maintain simplicity within each subset while achieving overall adaptability across different channel conditions, as each subset can be independently optimized for its specific channel characteristics.
Solution Approach 2:
The resource pool structure is designed to be universal and support multiple CP formats simultaneously through different resource subsets. This multi-functionality allows the same physical resource pool to serve both long CP and normal CP requirements, maintaining system simplicity while enhancing adaptability to diverse channel conditions.
Data Source
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AI summary
The present disclosure discloses a plurality of configuration schemes for coexistence of D2D signals with different CP lengths in D2D communication. In Scheme 1-1, a network allocates a specific CP length for some kind of D2D channel of all users in a cell; in Scheme 1-2, the network configures a specific CP length for each of D2D channels of each user in the cell; in Scheme 2-1, the network configures one CP length for each of D2D subframes; in Schemes 2-2 to 2-4, the system configures a CP length periodically, in which for N D2D subframes within a configuration periodicity, the network configures one CP length for each of (N-M) (M=1, 2) D2D subframes; while for the remaining M (M=1, 2) D2D subframes, the system multiplexes SC-FDMA/OFDM symbols with different CP lengths in a TDM, a FDM, and a TDM & FDM ways, respectively; and in Scheme 2-5, the network configures one CP length for each allocated time-frequency physical resource set.