Terminal Bandwidth Adjustment for Energy-Efficient Data Transmission
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Solution Overview
Problem
In mobile communication systems, when a terminal monitors a physical downlink control channel (PDCCH) with a smaller bandwidth for energy saving, it faces inefficiencies in time-domain resource utilization due to the need to expand receiving bandwidth for data scheduling on larger bandwidths, resulting in a period where the base station cannot perform data scheduling and the terminal cannot receive useful data.
Innovation Solution
The base station sends a first downlink control channel in a first sub-band, with the frequency-domain range of scheduled data occupying a second sub-band, and configures a time interval for the terminal to adjust its receiving bandwidth, allowing data transmission only before and after specific moments, ensuring efficient resource allocation and utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the terminal monitors PDCCH with a smaller bandwidth for energy saving, then energy consumption is reduced, but time-domain resource utilization efficiency deteriorates due to the need to expand receiving bandwidth for data scheduling
Solution Approach 1:
The patent segments the time-domain resources into two distinct parts: a first time-domain range for bandwidth-adjusted data reception and a second time-domain range for full-bandwidth data reception. This segmentation allows the terminal to selectively expand bandwidth only when necessary, rather than maintaining full bandwidth continuously, thus reducing energy consumption while ensuring efficient resource utilization when data is actually transmitted.
Solution Approach 2:
The terminal dynamically adjusts its receiving bandwidth based on scheduling indications from the base station. When data is scheduled in the first time-domain range, the terminal expands its receiving bandwidth to match the scheduled bandwidth; when no data is scheduled, the terminal maintains a smaller monitoring bandwidth. This dynamic adjustment resolves the contradiction between energy saving and resource utilization efficiency.
2Productivity
If the terminal expands receiving bandwidth to perform data scheduling on larger bandwidth, then data reception capability is improved, but energy consumption increases
Solution Approach 1:
The base station sends scheduling indication information in advance to the terminal, specifying whether data will be transmitted in the first or second time-domain range. Based on this preliminary information, the terminal proactively adjusts its receiving bandwidth before data transmission occurs, expanding bandwidth only when needed and maintaining lower bandwidth during idle periods, thus optimizing the balance between data reception capability and energy consumption.
Solution Approach 2:
The terminal changes its receiving bandwidth parameter dynamically based on the scheduling indication. When the indication specifies data transmission in the first time-domain range, the terminal expands its receiving bandwidth to the scheduled bandwidth; otherwise, it maintains a smaller bandwidth. This parameter change allows the terminal to adapt its data reception capability to actual transmission needs, reducing unnecessary energy consumption.
3Productivity
If the base station performs data scheduling on larger bandwidth, then data transmission efficiency is improved, but the terminal cannot receive useful data during the bandwidth adjustment period
Solution Approach 1:
The patent divides the time-domain resources into a first time-domain range and a second time-domain range, with the first range positioned before the second range. By scheduling data in the first time-domain range when the terminal expands bandwidth, the system ensures continuous data reception without loss, as the terminal has already adjusted its bandwidth before the data transmission begins. This segmentation eliminates the time loss that would occur during bandwidth adjustment.
Solution Approach 2:
The terminal performs bandwidth expansion in advance based on the scheduling indication from the base station, before the actual data transmission begins in the first time-domain range. This preliminary action ensures that the terminal's receiving bandwidth is already adjusted and ready when data transmission starts, eliminating any delay or time loss that would otherwise occur during the bandwidth adjustment process.
Data Source
AI summary
A data transmission method and apparatus, a network device and a terminal are provided, the method includes: a base station sending a first downlink control channel in a first sub-band, the first downlink control channel being configured to schedule data in a first time-domain range, and a frequency-domain range of the scheduled data in the first time-domain range occupies a second sub-band; if the second sub-band exceeds the first sub-band, the base station transmitting data based on the first sub-band before a first moment in the first time-domain range and transmitting data based on the second sub-band after a second moment in the first time-domain range, a time interval between the first moment and the second moment being configured for a terminal to adjust a receiving bandwidth and no data transmission is performed during the time interval.