D2D Communication Gap and Cyclic Prefix Configuration
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Solution Overview
Problem
Current device-to-device (D2D) communication systems face challenges in determining optimal gap sizes and cyclic prefix lengths for efficient discovery and data communication, particularly in scenarios with varying network coverage and inter-cell operations, which can lead to suboptimal performance and increased complexity in configuring these parameters.
Innovation Solution
The proposed solution involves mechanisms for determining and configuring gap sizes and cyclic prefix lengths for D2D discovery and data communication, using predefined standards, higher-layer signaling, and broadcasted information, allowing UEs to preconfigure or dynamically select appropriate values based on network coverage scenarios, thereby simplifying the implementation and improving communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed gap size and cyclic prefix length are used in D2D communication, then device complexity is reduced, but communication reliability deteriorates due to suboptimal performance in varying network coverage scenarios
Solution Approach 1:
The patent implements dynamic gap size and cyclic prefix length configuration where UEs can adapt these parameters based on their network coverage scenario. The system transitions from fixed parameters to dynamically adjustable parameters, allowing UEs in different coverage conditions (in-coverage, partial-coverage, out-of-coverage) to select optimal parameter values, thereby resolving the contradiction between fixed configuration simplicity and adaptive performance reliability.
Solution Approach 2:
The patent changes the parameter values of gap size and cyclic prefix length based on network coverage scenarios. Different parameter sets are defined for different coverage conditions, and UEs select appropriate parameters according to their scenario. This parameter adaptation mechanism improves communication reliability without significantly increasing device complexity, as the parameter selection follows standardized procedures.
2Reliability
If dynamic gap size and cyclic prefix length configuration is implemented, then communication reliability improves for varying network scenarios, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-defining multiple sets of gap size and cyclic prefix length parameters for different network coverage scenarios before actual communication occurs. UEs are provided with these pre-configured parameter sets through higher-layer signaling or broadcast information, eliminating the need for complex real-time calculations and reducing runtime decision complexity while maintaining adaptive reliability.
Solution Approach 2:
The patent introduces higher-layer signaling and broadcast information as intermediaries to convey parameter configuration information from the network to UEs. This intermediary mechanism simplifies the complexity burden on UEs by having the network side manage and distribute appropriate parameter configurations, rather than requiring each UE to independently determine optimal parameters in all scenarios.
3Adaptability or versatility
If blind detection is used to determine gap size and cyclic prefix length, then adaptability to different scenarios is improved, but measurement precision and error rate worsen
Solution Approach 1:
The patent implements feedback mechanisms where UEs receive confirmation and configuration information from the network regarding the selected gap size and cyclic prefix length. Instead of relying solely on blind detection, the system uses network feedback to verify and guide parameter selection, significantly improving measurement precision and reducing error rates while maintaining adaptability to different coverage scenarios.
Data Source
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AI summary
A user equipment (UE) is capable of directly communicating with one or more other UEs using a 3rd Generation Partnership Project (3GPP) communication specification. The UE is configured to identify a gap size for a device-to-device communication. The UE is configured to identify a cyclic prefix length for the device-to-device communication and transmit the device-to-device communication comprising a subframe having a physical uplink shared channel (PUSCH) structure. The subframe has the identified cyclic prefix length, and one or more last symbols of the subframe include a gap having the identified gap size.