Cross-Cell PDSCH Scheduling Using Unified Downlink Control Info
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently scheduling downlink data channels, particularly in 5G networks, where diverse services like eMBB, mMTC, and URLLC require different transmission/reception techniques and parameters, necessitating improved methods for allocating data channels using downlink control information.
Innovation Solution
The method involves transmitting configuration information for scheduling one or more data channels across multiple cells via a single piece of downlink control information, utilizing carrier indication, cell group indication, frequency domain resource allocation, modulation and coding scheme, and MCS offset fields to efficiently allocate resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate downlink control information is transmitted for each data channel on different carriers, then scheduling precision for each channel is improved, but control signaling overhead and system complexity increase
Solution Approach 1:
The patent combines multiple downlink control information elements into a single DCI message that can schedule multiple data channels across different carriers simultaneously. This merging approach reduces control signaling overhead and simplifies system complexity while maintaining the ability to precisely schedule each individual channel through dedicated field configurations within the unified DCI structure.
Solution Approach 2:
The patent creates a universal downlink control information format that can serve multiple scheduling functions simultaneously. A single DCI message structure is designed to handle scheduling for multiple carriers and data channels, making the control mechanism multi-functional. This universal format adapts to different scheduling scenarios through configurable fields, reducing the need for separate control messages for each channel.
2Adaptability or versatility
If multiple separate DCI messages are used to schedule data channels on different carriers, then individual channel allocation flexibility is improved, but transmission latency increases
Solution Approach 1:
The patent merges multiple channel allocation operations into a single DCI transmission event. By combining multiple carrier scheduling information into one DCI message, the system reduces the number of separate transmission and processing events, thereby lowering overall transmission latency while preserving individual channel allocation flexibility through dedicated resource indication fields for each carrier.
3Manufacturing precision
If configuration information is transmitted for each data channel separately, then resource allocation precision is improved, but processing overhead at UE increases
Solution Approach 1:
The patent combines configuration information for multiple data channels into a single DCI message structure. This merging reduces the number of separate processing operations required at the UE, lowering processing overhead. The precision of resource allocation is maintained through carefully designed field structures within the unified DCI that provide specific resource indications for each scheduled carrier and channel.
Data Source
AI summary
Disclosed are a method and device for transmitting and receiving downlink control information (DCI) in a wireless communication system. A method to be performed by a base station comprises steps in which configuration information on scheduling of one or more PDSCHs to one or more cells through one piece of DCI is transmitted to a UE through upper layer signaling, at least one of a carrier indicator field (CIF) or a cell group indicator field (GIF) included in the DCI, the size of a frequency domain resource allocation field commonly applied to the one or more PDSCHs, and at least one modulation and coding scheme (MCS) field and/or MCS offset field are determined according to the configuration information, and the at least one of the CIF or GIF, the frequency domain resource allocation field having the determined size, and the at least one MCS field and/or MCS offset field are transmitted to the UE by being included in the DCI for scheduling the plurality of PDSCHs to a plurality of cells, respectively, according to the configuration information.