D2D Resource Allocation via Sidelink Control Information
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Solution Overview
Problem
In mobile communication networks, device-to-device (D2D) communication links face interference and resource allocation challenges, especially when D2D UEs are outside the coverage area of an access point, making it difficult to establish and maintain efficient direct communication links without involving a third party.
Innovation Solution
A method and device for D2D communication where a first D2D UE indicates resource allocation information in a resource allocation message, using Sidelink Control Information (SCI) messages with specific formats and flags, and transmits this information over the Physical Sidelink Control Channel (PSCCH) to establish a dedicated control channel for communication with other D2D UEs, allowing them to autonomously select and allocate resources for data and control information exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D UEs share uplink band with non-D2D UEs for communication with BTS, then network resource utilization is improved, but interference between D2D UEs and cellular UEs increases
Solution Approach 1:
The patent segments the uplink band into separate resource pools: one for D2D communication and another for cellular UE communication. This segmentation allows both D2D and cellular UEs to share the uplink band simultaneously while preventing interference through spatial and temporal resource separation.
Solution Approach 2:
The patent introduces an additional dimension of resource allocation by creating separate resource pools within the uplink band. Instead of sharing the same frequency resources, D2D and cellular UEs are allocated different resource blocks, adding a frequency dimension to the resource allocation strategy and eliminating interference.
2Adaptability or versatility
If D2D UEs outside access point coverage establish direct communication, then network coverage and accessibility are improved, but resource allocation complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring resource pools for D2D communication before UEs need to establish direct links. UEs outside coverage can autonomously select resources from these pre-defined pools without real-time coordination, simplifying the resource allocation process while enabling coverage extension.
Solution Approach 2:
D2D UEs perform self-service by autonomously selecting and allocating resources from the pre-configured pools without requiring access point coordination. This self-service mechanism reduces the complexity of resource allocation for out-of-coverage UEs while maintaining efficient direct communication.
3Adaptability or versatility
If multiple SCI message types with different formats are used for resource allocation, then resource allocation flexibility and precision are improved, but message processing complexity increases
Solution Approach 1:
The patent applies local quality by using different SCI message formats for different resource allocation scenarios. Format 0 is used for basic resource allocation, while Format 0-ext is used when additional information is needed. Each format is optimized for its specific use case, providing flexibility without requiring all UEs to process all format types.
Solution Approach 2:
The patent implements dynamics by allowing the SCI message format to be dynamically selected based on the resource allocation requirements. The system can switch between Format 0 and Format 0-ext depending on whether additional resource allocation information is needed, providing adaptive flexibility while keeping processing complexity manageable through format selection.
Data Source
AI summary
When at least one of device-to-device UEs in connections of a group of D2D UEs is outside of the coverage area of mobile network of an access point, an information exchange mechanism established directly between the D2D UEs without involving a third party, is provided. A Sidelink Control Information (SCI) message type comprises one or more format flags indicating the respective resource allocation format, obtaining a first SCI message, adjusting a size of the first SCI message based on the determined size, and transmitting the adjusted first SCI message by a first UE in a Physical Sidelink Control Channel (PSCCH) to one or more second UEs for establishing the D2D communication link.