D2D Downlink Control Information Scheduling via Segmented DCI Formats
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Solution Overview
Problem
Current wireless communication systems face challenges in configuring downlink control information for Device-to-Device (D2D) communication due to the large amount of control information required for scheduling and data transmission, leading to a heavy signaling burden.
Innovation Solution
A method for transmitting and receiving downlink control information in a D2D communication system, utilizing a Physical Sidelink Control Channel (PSCCH) and Physical Sidelink Shared Channel (PSSCH), with specific fields such as a hopping flag, resource allocation, and transmission power control, to efficiently schedule D2D communication data between UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single downlink control information format is used for D2D communication, then the control information configuration is simplified, but it cannot accommodate the large amount of control information required for scheduling assignment and D2D direct communication data transmission
Solution Approach 1:
The patent divides the control information into two separate formats: DCI format 5 for scheduling assignment and DCI format 6 for D2D direct communication data transmission. This segmentation allows each format to be optimized for its specific purpose, accommodating the large amount of control information without requiring a single complex format.
Solution Approach 2:
The patent creates a unified DCI structure that can serve multiple functions through different formats. Both DCI format 5 and format 6 share common field structures and can be transmitted through the same physical downlink control channel, providing universality while handling different types of D2D control information.
2Quantity of substance
If separate downlink control information formats are used for scheduling assignment and D2D direct communication data transmission, then the control information can be adequately configured, but the signaling burden increases
Solution Approach 1:
The patent designs DCI format 5 and DCI format 6 with unified structural characteristics, allowing both formats to be transmitted through the same physical downlink control channel using similar processing procedures. This universality reduces the signaling burden despite having separate formats for different control information types.
Solution Approach 2:
The patent employs homogeneous field structures in both DCI formats, with corresponding fields (resource allocation, resource indication value, modulation and coding scheme, etc.) having consistent formats and positions. This homogeneity simplifies the UE's processing and reduces signaling complexity while accommodating comprehensive control information.
Data Source
AI summary
A method for transmitting and receiving downlink control information in a wireless communication system supporting device-to-device communication and a device for the same are disclosed. The method for receiving downlink control information in a wireless communication system supporting D2D (Device-to-Device) communication includes: receiving, by a UE, downlink control information for D2D communication from an eNB; transmitting, by the UE to a reception UE, D2D communication control information on a PSCCH (Physical Sidelink Control Channel) based on the downlink control information; and transmitting, by the UE to the reception UE, D2D communication data on a PSSCH (Physical Sidelink Shared Channel) based on the downlink control information, wherein the downlink control information may include: a hopping flag field indicating whether frequency hopping is applicable when transmitting the D2D communication control information and the D2D communication data; a PSCCH resource allocation (RA) field including scheduling information for the PSCCH; a first PSSCH RA field including scheduling information for the PSSCH in a frequency domain; a second PSSCH RA field including scheduling information for the PSSCH in a time domain; and a TPC (Transmission Power Control) field including transmission power information for the PSCCH and PSSCH.