D2D Resource Allocation via Sidelink Control Information
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Solution Overview
Problem
In device-to-device (D2D) communication, receiving D2D UE may not understand resource allocations when the bandwidth assigned by an access point (AP) for D2D UEs is different from the bandwidth used for transmissions between D2D UEs, leading to interference and communication issues.
Innovation Solution
A method where the initiating D2D UE encodes and transmits resource allocation information using a sidelink control information (SCI) format, either by copying or scaling the uplink frequency allocation, to ensure that additional D2D UEs understand the resource allocations, thereby facilitating communication even when the uplink and sidelink bandwidths differ.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the AP assigns a different bandwidth for D2D UEs than the bandwidth used for D2D transmissions, then resource allocation flexibility is improved, but receiving D2D UE cannot understand resource allocations leading to communication failure
Solution Approach 1:
The initiating D2D UE acts as an intermediary that receives uplink resource allocation from the AP and converts it into sidelink resource allocation information. This intermediary conversion process allows the system to maintain flexibility in resource assignment while ensuring that receiving UEs can correctly interpret the allocations through standardized SCI formatting.
Solution Approach 2:
The system changes the parameter representation of resource allocations by converting from uplink frequency allocation parameters to sidelink resource allocation parameters. This parameter transformation allows the same physical resources to be described in different coordinate systems appropriate for different communication directions.
2Productivity
If D2D UEs share uplink band with non-D2D UEs, then spectrum efficiency is improved, but interference between D2D and cellular UEs increases
Solution Approach 1:
The system segments the resource allocation information into separate control channels: uplink resource allocation is communicated through downlink control information to initiating UEs, while sidelink resource allocation is communicated through SCI formats between D2D UEs. This segmentation allows independent optimization of each communication type while sharing the same physical spectrum.
Solution Approach 2:
The initiating D2D UE performs preliminary conversion of resource allocation information before transmission. By pre-converting uplink resource allocation to sidelink resource allocation format in the SCI, the system ensures that receiving UEs can immediately understand the allocations without confusion, thereby preventing interference-related errors before they occur.
Data Source
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AI summary
When the frequency resource allocation is conveyed on a bandwidth that is different from a bandwidth on which the frequency resource allocation is sent, a receiving D2D UE needs to understand the resource allocations. A resource allocation method for device-to-device resource allocation is provided according to an example. The resource allocation method includes a first D2D user equipment (UE) receiving a downlink control information (DCI) from an access point, wherein the DCI comprises a first D2D frequency allocation and the first D2D frequency allocation comprises a first resource allocation field for transmission of data; setting a second resource allocation field of a second D2D frequency allocation of a sidelink control information (SCI) format according to the first resource allocation field; transmitting the SCI format to one or more additional D2D UEs; and transmitting the data on the resource according to the second D2D resource allocation.