D2D Control Information Transmission via DCI Format Reinterpretation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing and transmitting control information for D2D communication, particularly in configuring and activating radio resources for D2D ProSe services.
Innovation Solution
A method for receiving control information in a wireless communication system involves receiving information on semi-statically configured radio resources for D2D ProSe and downlink control information (DCI) to activate D2D ProSe on specific radio resources, with the DCI being valid only during the discovery procedure and having a length determined by the system bandwidth or D2D ProSe bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If control information for D2D communication is transmitted using existing wireless communication methods, then the system can maintain compatibility with current standards, but the efficiency of managing and transmitting control information for D2D ProSe services deteriorates
Solution Approach 1:
The patent changes the parameters of control information transmission by defining specific DCI formats (0 and 1A) with modified field structures for D2D communication. The resource block assignment field and hopping resource allocation field are reinterpreted to indicate D2D resource units and discovery subframes, enabling efficient D2D resource allocation while maintaining compatibility with existing LTE downlink control channel structures.
Solution Approach 2:
The patent makes existing DCI formats multi-functional by enabling them to serve both traditional uplink scheduling purposes and D2D communication resource allocation. The same DCI formats and resource block assignment fields are used for both purposes, reducing the need for separate control mechanisms and improving overall system efficiency.
2Measurement precision
If DCI is used to activate D2D ProSe on specific radio resources, then the activation control becomes precise and efficient, but the complexity of resource configuration increases
Solution Approach 1:
The patent segments the resource configuration into discoverable units by dividing the time-frequency resources into specific discovery subframes and resource units. Each DCI message points to specific resource units within the configured resource pool, allowing precise activation control while maintaining manageable configuration complexity through structured segmentation.
Solution Approach 2:
The patent applies preliminary action by first configuring a semi-static resource pool for D2D discovery before activating specific resources through DCI. The resource pool configuration is established in advance, and then DCI messages dynamically activate specific resource units within this pre-configured pool, reducing the complexity of real-time resource management.
3Adaptability or versatility
If the DCI format length is determined by system bandwidth or D2D ProSe bandwidth, then the control information adapts to different bandwidth configurations, but the processing complexity increases
Solution Approach 1:
The patent changes the parameter of DCI format length to be adaptive based on system bandwidth or D2D ProSe bandwidth configuration. The resource block assignment field and hopping resource allocation field sizes are adjusted according to the configured bandwidth, enabling the DCI format to adapt to different deployment scenarios while maintaining a consistent basic structure for simplified processing.
Data Source
AI summary
A method of transmission by a user equipment (UE) in a wireless communication system, the method including receiving, by the UE from a eNB, a physical downlink control channel (PDCCH) which is scrambled with one of a semi-persistent scheduling (SPS) Cell-radio network temporary identifier (RNTI) or a sidelink RNTI, wherein the PDCCH includes a downlink control information (DCI) format 0 including a three bit-field; and transmitting, by the UE, a signal based on the DCI format 0, wherein the three bit-field is related to a cyclic shift DMRS based on that the PDCCH is scrambled with the SPS C-RNTI, and wherein the three bit-field is used as a resource information for a sidelink communication, based on that the PDCCH is scrambled with the sidelink RNTI.