Low-Bandwidth 5G NR Cell Reselection With Initial BWP Signaling
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Solution Overview
Problem
In 5G NR systems, terminal devices with limited multi-antenna and high bandwidth capabilities, such as MTC devices, face increased power consumption and prolonged cell search/reselection times due to attempting to find suitable cells that match their bandwidth capabilities.
Innovation Solution
A method where terminal devices receive indication information from a network device about the initial bandwidth part of neighboring cells, allowing them to determine suitability for reselection or camping based on their type, thereby avoiding unsupported bandwidths and reducing unnecessary measurements and searches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminal devices with limited bandwidth capability perform cell search or cell reselection without bandwidth information, then they can potentially find cells with better signal quality, but they waste time and power consuming measurements on cells with unsupported bandwidth
Solution Approach 1:
The network device performs preliminary action by indicating the initial bandwidth part information of neighboring cells before the terminal device performs cell measurements. This allows the terminal device to pre-filter suitable cells based on bandwidth compatibility, avoiding wasted measurements on incompatible cells and reducing overall cell search time.
Solution Approach 2:
The patent segments the cell selection process into two stages: first filtering cells based on bandwidth capability matching using the indicated initial bandwidth part information, then performing detailed measurements only on compatible cells. This segmentation reduces the total measurement burden on terminal devices with limited bandwidth capability.
2Reliability
If terminal devices with limited bandwidth capability perform cell search or cell reselection without bandwidth information, then they can potentially find cells with better signal quality, but they consume excessive power performing unnecessary measurements
Solution Approach 1:
The network device provides preliminary bandwidth information about neighboring cells before the terminal device initiates measurements. This preliminary action enables the terminal device to identify and exclude incompatible cells from measurement, significantly reducing power consumption by avoiding unnecessary RF tuning, signal acquisition, and measurement processing on unsupported bandwidths.
Solution Approach 2:
Instead of requiring terminal devices to perform complete measurements on all neighboring cells, the patent applies partial action by having devices measure only the subset of cells that match their bandwidth capability. This selective measurement approach reduces power consumption while still ensuring reliable cell reselection to suitable cells.
3Speed
If terminal devices attempt to camp on cells with unsupported bandwidth, then they might achieve faster initial connection, but they fail to maintain stable communication
Solution Approach 1:
The network device indicates the initial bandwidth part information of neighboring cells in advance, allowing terminal devices to perform preliminary compatibility checking before attempting to camp. This ensures that devices only select cells matching their bandwidth capability, maintaining communication stability while still achieving relatively fast reselection by avoiding incompatible cell attempts.
Solution Approach 2:
The terminal device uses its own bandwidth capability information in combination with the network-indicated initial bandwidth part information to self-determine cell suitability. This self-service mechanism ensures that devices autonomously select compatible cells, guaranteeing communication stability without requiring post-selection reconfiguration or handover.
Data Source
AI summary
This application provides a cell reselection method, a terminal device, and a network device. The terminal device may be a low-bandwidth terminal device, so that a time period for the terminal device to perform cell reselection is reduced, and power consumption of the terminal device is reduced. The method includes: The terminal device receives first indication information sent by the network device, where the first indication information indicates information about an initial bandwidth part of a first cell, the first cell is a neighboring cell of a second cell, and the second cell is a cell on which the terminal device currently camps. The terminal device determines, based on a type of the terminal device and the first indication information, whether to reselect to the first cell.