Transmission Resource Bitmaps for Lower-Power LBT Detection
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Solution Overview
Problem
In unlicensed bands of future communications systems, terminals face high power consumption due to the need to perform detection on all subbands and component carriers before transmission, as they do not know which LBT subbands or component carriers the network device is using, leading to inefficient resource utilization.
Innovation Solution
A network device sends first indication information to a terminal using a bitmap to specify the transmission resources, which are LBT subbands of bandwidth parts or component carriers in carrier aggregation, allowing the terminal to perform detection only on the indicated resources within the channel occupancy time (COT).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal performs detection on all subbands and component carriers to ensure complete coverage, then the detection reliability is improved, but the power consumption increases significantly
Solution Approach 1:
The patent segments the detection scope from 'all subbands and component carriers' to 'indicated LBT subbands only'. The network device sends indication information to specify which LBT subbands the terminal should detect, dividing the large detection space into manageable segments based on actual transmission needs.
Solution Approach 2:
The network device performs preliminary action by sending indication information beforehand to tell the terminal which LBT subbands will be used for transmission. This allows the terminal to prepare its detection in advance, focusing only on relevant subbands rather than performing exhaustive detection.
2Loss of information
If the terminal detects on all subbands including PDCCH blind detection, PDSCH detection, DRS detection, CSI measurement, and RSSI measurement, then the resource detection completeness is improved, but the detection complexity and time increase
Solution Approach 1:
The patent segments the detection resources by indicating specific LBT subbands through bitmap information. Instead of requiring comprehensive detection across all subbands, the terminal only needs to detect on the indicated subbands, reducing the number of PDCCH blind detections, PDSCH detections, DRS detections, CSI measurements, and RSSI measurements required.
Solution Approach 2:
The patent extracts the essential detection requirement from the comprehensive detection set. By indicating which LBT subbands contain transmission resources, the network device allows the terminal to extract and perform detection only on those specific subbands, removing the need for exhaustive detection on all subbands while maintaining necessary resource detection completeness.
3Productivity
If the network device transmits on multiple LBT subbands, then the resource utilization is improved, but the terminal's detection burden increases
Solution Approach 1:
The patent introduces indication information as an intermediary between the network device and terminal. The network device sends bitmap information indicating which LBT subbands are used for transmission, serving as a mediator that guides the terminal's detection process. This intermediary mechanism allows the network to utilize multiple LBT subbands efficiently while reducing the terminal's detection burden by providing clear guidance on where to detect.
Data Source
AI summary
This disclosure provides a transmission resource indication method, a transmission method, a network device, and a terminal. The transmission resource indication method includes: sending first indication information to a terminal, where the first indication information indicates, by using a bitmap, a transmission resource for detection by the terminal, and the transmission resource is an LBT subband of a bandwidth part BWP or a component carrier CC in carrier aggregation. By using the bitmap, the transmission resource for detection by the terminal, so that after receiving the first indication information, the terminal can perform detection on the corresponding transmission resource within the COT based on the first indication information. In this way, the number of transmission resources for detection by the terminal can be reduced, thereby reducing power consumption of the terminal.