Unlicensed NR Control Channel Layout for LBT Bandwidth Segments
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing 5G NR communication systems face inefficiencies in spectrum utilization and increased complexity in blind detection due to wide bandwidths and the need for Listen Before Talk (LBT) on unlicensed spectrums, leading to wasted resources and excessive signaling overhead.
Innovation Solution
The method involves dividing carrier bandwidth into multiple bandwidth portions with control regions for LBT testing, selecting a bandwidth portion for control channel transmission based on test results, and using indicators to manage CORESET usage, reducing blind detection complexity and optimizing spectrum utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If LBT is performed on each bandwidth portion for very wide carrier bandwidth, then spectrum utilization is improved, but device complexity and blind detection complexity increase
Solution Approach 1:
The patent segments the carrier bandwidth into multiple bandwidth portions (e.g., 20 MHz subbands) and performs LBT independently on each segment. This allows parallel channel access testing across multiple frequency segments, improving overall spectrum utilization efficiency while managing complexity through modular processing of each bandwidth portion
2Adaptability or versatility
If control channel is transmitted in every bandwidth portion that passes LBT, then scheduling flexibility is improved, but signaling overhead increases
Solution Approach 1:
The patent enables a single control channel transmission in one bandwidth portion to serve multiple bandwidth portions for data scheduling. The control information transmitted in one location can indicate resource allocations across multiple other bandwidth portions, making the control channel universally applicable and reducing redundant signaling while maintaining scheduling flexibility
3Quantity of substance
If multiple bandwidth portions pass LBT test, then available transmission resources increase, but resource allocation efficiency decreases
Solution Approach 1:
The patent dynamically selects which bandwidth portion will carry the control channel based on real-time LBT results. When multiple bandwidth portions pass LBT, the system flexibly allocates the control channel to the most appropriate segment and uses control information to schedule data transmissions across multiple available portions, optimizing resource utilization efficiency
Data Source
AI summary
The present application relates to method and apparatus for downlink control channel design for data transmission on unlicensed spectrum. One embodiment of the present disclosure provides a method comprising: dividing a carrier bandwidth into a plurality of bandwidth portions, wherein each of the plurality of bandwidth portions includes a control region for transmitting control channel; performing a channel access test for each of the plurality of bandwidth portions; determining a first bandwidth portion from the plurality of bandwidth portions according to channel access test results of the plurality of bandwidth portions; transmitting a first control channel in a first control region of the first bandwidth portion, wherein the first control channel is used for scheduling a data transmission in one or more bandwidth portions of the plurality of bandwidth portions.