D2D Resource Allocation via Segmented DCI Grants
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing resource allocation for device-to-device (D2D) communication, particularly in indicating scheduling assignment (SA) and data resource domains, which affects communication performance and resource utilization.
Innovation Solution
A method is introduced to separately indicate positions of scheduling assignment (SA) and D2D data resource domains using a D2D grant, allowing for accurate resource allocation by including additional control information in the downlink control information (DCI) format, ensuring the same size as DCI format 0 and using extra bits for bandwidth indication, and enabling puncturing or rate-matching in overlapping resource domains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate indication of SA and D2D data resource domains is implemented using D2D grant, then resource allocation precision is improved, but DCI format complexity increases
Solution Approach 1:
The resource domain indication is segmented into separate fields: one field indicates the SA resource domain position and another field indicates the D2D data resource domain position. This segmentation allows precise separate indication of both resource domains while maintaining structured DCI format organization, resolving the contradiction between precision and complexity.
Solution Approach 2:
The patent introduces an additional dimension to the DCI format by adding extra bits specifically for resource domain position indication. This dimensional expansion enables more precise resource allocation without fundamentally changing the existing DCI structure, allowing precision improvement while controlling complexity growth.
2Measurement precision
If extra bits are added to DCI format for bandwidth indication, then resource allocation accuracy is improved, but DCI format size increases
Solution Approach 1:
The patent changes the parameter representation by introducing an extra bit in the DCI format that enables more granular bandwidth indication. This bit allows the system to indicate different bandwidth sizes or resource domain positions with higher accuracy. The parameter change is designed to minimize size increase while maximizing indication precision.
3Productivity
If DCI format size is maintained same as DCI format 0, then processing overhead is reduced, but resource indication capability is limited
Solution Approach 1:
The patent applies partial action by adding only the minimum necessary extra bit to the DCI format rather than completely redesigning it. This partial modification maintains compatibility with existing processing mechanisms (keeping size similar to DCI format 0) while providing enhanced resource indication capability. The excessive action would have been to completely redesign the DCI format, which is avoided to maintain processing efficiency.
Data Source
AI summary
The present specification relates to a method for transmitting and receiving data in a wireless communication system supporting device-to-device (D2D) communication. The method performed by a first terminal comprises the steps of: receiving, from a base station, a resource pool for use in D2D communication, the resource pool including at least one of a scheduling assignment (SA) resource pool indicating a resource region where SA is transmitted, and a data resource pool indicating a resource region where D2D data are transmitted; transmitting SA including information relating to D2D data transmission, to a second terminal through the SA resource pool; and transmitting D2D data to the second terminal.