DCI Size Reduction via Pre-configured Frequency Domain Resource Patterns
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Solution Overview
Problem
Current designs for the control channel of Ultra-Reliable Low-Latency Communication (URLLC) services in 5G New Radio (NR) systems lack maturity, particularly in efficiently managing Downlink Control Information (DCI) with small data sizes to ensure high reliability and low latency.
Innovation Solution
The method involves pre-determining K frequency domain resource patterns and using DCI to indicate an index of a first frequency domain resource pattern, with configuration information sent through various signaling messages like Master Information Block (MIB), System Information Block (SIB), Radio Resource Control (RRC) messages, or Medium Access Control (MAC) Control Elements to allocate frequency domain resources efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional DCI transmission design is used for URLLC service, then the control channel can transmit service data, but the DCI size is large which reduces transmission reliability
Solution Approach 1:
The patent extracts and separates the frequency domain resource indication from the DCI payload by using pre-configured tables. The DCI only carries an index to point to pre-defined resource allocations, removing the need to transmit detailed resource assignment information in the DCI itself, thus reducing DCI size while maintaining reliability
Solution Approach 2:
The patent applies preliminary action by pre-configuring frequency domain resource allocation patterns and their corresponding indices before actual data transmission. The access network device sends configuration information in advance that defines multiple frequency domain resource patterns, allowing the DCI to simply reference pre-established resource allocations rather than describing them fully
2Reliability
If DCI size is reduced for URLLC service, then transmission reliability improves, but the complexity of resource pattern configuration increases
Solution Approach 1:
The patent creates a universal configuration framework where a single set of pre-defined frequency domain resource patterns can serve multiple URLLC services and scenarios. The same configuration mechanism and table structure can be applied across different bandwidths and service types, reducing the need for service-specific configuration complexity
Solution Approach 2:
The patent manages complexity by parameterizing the configuration through indices and pattern identifiers rather than explicit resource descriptions. By changing from detailed resource allocation parameters to compact index references, the system reduces the information burden in DCI while maintaining flexibility through configurable pattern definitions
3Productivity
If frequency domain resources are pre-divided into K groups, then resource allocation efficiency improves, but the system requires more configuration information to be transmitted
Solution Approach 1:
The patent uses copying by creating standardized templates or patterns of frequency domain resource allocations that can be replicated and referenced. Instead of configuring each resource allocation individually, the system defines K representative patterns that can be copied and applied through simple index references in DCI, reducing the amount of configuration information needed
Solution Approach 2:
The patent applies segmentation by dividing the frequency domain resources into K distinct groups or patterns, each representing a specific allocation scheme. This segmentation allows the system to manage complex resource allocation by breaking it down into discrete, pre-configurable units that can be selected and combined through indexing rather than detailed configuration
Data Source
AI summary
Provided are an information sending method and apparatus, a terminal, an access network device and a system, which relate to the field of communications. The method comprises: an access network device determines a first frequency domain resource pattern among K frequency domain resource patterns, each frequency domain resource pattern corresponding to at least one frequency domain resource; the access network device sends downlink control information to a terminal, the downlink control information being used for indicating an index of the first frequency domain resource pattern, the frequency domain resource corresponding to the first frequency domain resource pattern being used for transmitting service data of the terminal. The K frequency domain resource patterns are provided in advance, and when it is necessary for the access network device to allocate the one or more resources corresponding to the frequency domain resource pattern to the terminal, the downlink control information requires only a very few bits to indicate the index of the first frequency domain resource pattern, thereby enabling the size of the downlink control information to be relatively small, increasing the transmission reliability and transmission efficiency of the downlink control information, and reducing the number of retransmissions.