NB-IoT Uplink-Downlink Carrier Frequency Spacing Indication
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Solution Overview
Problem
The existing Narrowband Internet of Things (NB-IoT) technologies face challenges in achieving consistent uplink-downlink carrier frequency spacing, leading to deviations that cause interference and waste of bandwidth due to incorrect frequency allocation, particularly in in-band and guard band operation modes.
Innovation Solution
A method and apparatus that allow the base station to determine and indicate the correct uplink-downlink carrier frequency spacing to terminal devices by generating specific indication information based on the NB-IoT operation mode and application scenarios, ensuring accurate frequency allocation and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If in-band operation mode is used for NB-IoT, then spectrum efficiency is improved by reusing LTE carrier resources, but uplink-downlink carrier frequency spacing deviation occurs causing interference and bandwidth waste
Solution Approach 1:
The patent changes the frequency spacing parameter from the LTE standard value to an NB-IoT specific value. The base station determines the NB-IoT uplink-downlink carrier frequency spacing based on the actual NB-IoT carrier frequencies, and explicitly indicates this spacing value to terminals through signaling, ensuring terminals use the correct spacing for uplink carrier frequency determination.
2Object-affected harmful factors
If guard band operation mode is used for NB-IoT, then interference to adjacent bands is reduced, but uplink-downlink carrier frequency spacing deviation still occurs leading to bandwidth waste
Solution Approach 1:
The patent applies the same parameter change principle for guard band operation. The base station determines the NB-IoT uplink-downlink carrier frequency spacing based on actual NB-IoT carrier frequencies in guard band mode, and indicates this spacing to terminals through signaling, ensuring correct uplink frequency allocation without bandwidth waste.
3Device complexity
If terminals continue to use LTE uplink-downlink carrier frequency spacing definition, then device complexity is reduced, but frequency allocation accuracy deteriorates causing interference and bandwidth waste
Solution Approach 1:
The base station provides feedback to terminals about the correct NB-IoT uplink-downlink carrier frequency spacing through indication signaling. This feedback mechanism ensures terminals allocate uplink carrier frequencies accurately according to actual NB-IoT network conditions, resolving the frequency spacing deviation problem while maintaining simple terminal implementation.
Data Source
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AI summary
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for indicating an uplink-downlink carrier frequency spacing, and a method and an apparatus for obtaining an uplink-downlink carrier frequency spacing, so that a terminal obtains a correct NB-IoT system uplink carrier frequency. The method is: obtaining, by a base station, a determining parameter used to determine an uplink-downlink carrier frequency spacing of a first cell, and generating indication information according to the determining parameter, where the indication message is used to indicate the uplink-downlink carrier frequency spacing of the first cell; and sending, by the base station, the indication information to a terminal device UE that initiates a request in the first cell to access an NB-IoT. The method for obtaining an uplink-downlink carrier frequency spacing is: initiating, by UE, a request in a first cell to access an NB-IoT, and receiving an indication message sent by a base station; and determining, by the UE according to the indication information, an uplink-downlink carrier frequency spacing corresponding to the first cell. Therefore, the base station can notify the UE of the uplink-downlink carrier frequency spacing corresponding to the first cell, so that the terminal obtains a correct uplink carrier frequency.