Sequence Group Paging for D2D Interference Reduction
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Solution Overview
Problem
In device-to-device (D2D) communication scenarios, existing methods fail to effectively page and synchronize second devices with network side devices, leading to inefficiencies and resource wastage due to overlapping sequences from nearby first devices, which causes interference and increased power consumption.
Innovation Solution
A network side device generates a first sequence group based on area division, sending it to both first and second devices, allowing the first device to page and synchronize with the second device using orthogonal sequences, thereby avoiding interference and optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If first devices use the same sequence for paging and synchronizing second devices, then the paging and synchronization process is simple, but sequence interference occurs and power consumption increases
Solution Approach 1:
The patent divides the network coverage area into multiple sub-areas and assigns different sequence groups to first devices located in different sub-areas. This segmentation approach ensures that first devices use orthogonal sequences when paging and synchronizing second devices, thereby eliminating sequence interference while maintaining system simplicity
Solution Approach 2:
The patent implements location-based sequence assignment where the sequence group used by a first device depends on its specific geographic location (sub-area). This local quality approach ensures that each first device uses sequences appropriate to its location, avoiding interference with other first devices while keeping the overall system straightforward
2Ease of operation
If first devices use the same sequence for paging and synchronizing second devices, then the implementation is straightforward, but resource usage increases due to interference
Solution Approach 1:
By segmenting the network area into sub-areas and assigning different sequence groups to first devices in different sub-areas, the patent reduces resource waste caused by sequence interference. This approach maintains ease of operation through standardized procedures while optimizing resource utilization through location-based sequence differentiation
3Object-affected harmful factors
If area division is implemented with sequence group assignment, then sequence interference is avoided, but system complexity increases
Solution Approach 1:
The network side device performs preliminary actions by pre-dividing the coverage area into sub-areas and pre-assigning different sequence groups to first devices based on their locations. This preliminary configuration eliminates sequence interference before communication occurs, while the standardized assignment process keeps system complexity manageable
Solution Approach 2:
The patent introduces the network side device as an intermediary that manages sequence group assignment to first devices based on their locations. This intermediary approach centralizes the complexity of sequence management, allowing first devices to simply use assigned sequences without complex decision-making, thereby reducing overall system complexity while preventing interference
Data Source
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AI summary
Embodiments of the present invention provide a sequence configuration method, a subframe generation method, a network side device, and user equipment. The sequence configuration method includes: based on area division, generating, by a network side device, a first sequence group, and sending the first sequence group to a first device and a second device, so that the first device located in a first sub-area pages and/or synchronizes with the second device by using the first sequence group. In this way, the first device pages or synchronizes with the second device according to a sequence, thereby implementing paging for the second device.