D2D Broadcast Subchannel Orthogonalization via Signal Strength Signaling
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Solution Overview
Problem
Current device-to-device (D2D) broadcast communication systems face interference issues due to the lack of effective methods for reducing interference on D2D broadcast resources, which affects the quality of wireless communication.
Innovation Solution
The method involves a wireless device receiving D2D broadcasts in a set of subchannels, determining signal strength, and broadcasting control information to indicate a subset of subchannels with the highest signal strength, thereby reducing interference by selecting unutilized subchannels for data transmission, and optimizing resource allocation for control signaling to increase the target link budget and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If D2D broadcast communication is performed on selected D2D broadcast resources, then device-to-device communication capability is enabled, but interference on D2D broadcast resources increases
Solution Approach 1:
The patent segments the D2D broadcast resources by dividing subchannels into different sets (first set for control information, second set for data traffic) and assigns different devices to different segments. This segmentation allows orthogonalization between one-hop and two-hop devices, reducing interference while maintaining D2D broadcast communication capability.
Solution Approach 2:
The patent introduces a new dimension of resource allocation by creating a two-hop resource allocation mechanism that operates in addition to the existing one-hop allocation. This adds a hierarchical dimension to resource management, where control information and data traffic are allocated to different subchannel sets, enabling interference reduction without sacrificing communication versatility.
2Productivity
If control information is broadcasted to indicate subchannel usage, then resource allocation optimization is achieved, but signaling overhead increases
Solution Approach 1:
The patent applies partial action by having devices broadcast control information indicating only a subset of subchannels (specifically, the subchannels they intend to use for data traffic) rather than providing complete resource allocation information. This partial signaling approach optimizes resource allocation while minimizing the amount of control overhead that needs to be processed.
3Measurement precision
If signal strength determination is performed for each subchannel, then interference reduction accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent segments the signal processing task by dividing subchannels into distinct sets (first set for control, second set for data) and performing signal strength determination specifically for the relevant subchannels in each set. This segmented approach maintains measurement precision for interference reduction while reducing overall processing complexity compared to analyzing all subchannels uniformly.
Data Source
AI summary
A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus receives one or more D2D broadcasts in a set of subchannels of a channel. In addition, the apparatus broadcasts in at least one subchannel of the channel information indicating a subset of the set of subchannels. The one or more D2D broadcasts may include a first set of broadcasts that includes control information and a second set of broadcasts that includes data traffic. The broadcasted information may be control information. The apparatus may determine a signal strength of each of the one or more D2D broadcasts received in the set of subchannels. The broadcasted information may further include the determined signal strength for each subchannel in the subset of the set of subchannels.