Terminal Device Frequency Band Adaptation for Roaming
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Solution Overview
Problem
Terminal devices face communication challenges when roaming across different countries or regions due to varying spectrum allocations for licensed and unlicensed frequency bands, leading to ineffective data transmission.
Innovation Solution
A communication method where a network device indicates its working frequency band or system attribute to a terminal device, allowing it to determine whether it is operating in a licensed or unlicensed frequency band, enabling corresponding operations for effective data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a terminal device operates in unlicensed frequency bands using listen before talk (LBT) manner, then data transmission can be performed in unlicensed bands, but the terminal device cannot effectively communicate when roaming in different countries or regions due to different spectrum allocations
Solution Approach 1:
The network device performs preliminary classification of the frequency band (licensed or unlicensed) and pre-configures the corresponding communication parameters and LBT settings. The terminal device receives this configuration in advance through system information or RRC signaling, so when roaming in different countries, it can immediately apply the correct communication mode without trial and error, ensuring both adaptability to local spectrum policies and reliability of communication.
2Adaptability or versatility
If different spectrum plans are adopted in different countries, then each country can optimize its frequency band allocation, but terminal devices face communication challenges when roaming across borders
Solution Approach 1:
The network device acts as an intermediary that translates different national spectrum policies into unified terminal device configurations. Instead of requiring terminal devices to understand and adapt to complex local spectrum regulations, the network device receives the terminal's location information, determines the appropriate spectrum classification for that region, and automatically configures the terminal with the correct communication parameters, thereby maintaining operational simplicity for users while achieving spectrum allocation flexibility.
3Productivity
If the terminal device performs LBT operation in unlicensed bands, then it can transmit data in unlicensed frequency bands, but it may cause communication failure when the same frequency band is licensed in the current country
Solution Approach 1:
The system applies different communication qualities and protocols to different frequency bands based on local regulations. The network device classifies each frequency band as licensed or unlicensed according to the local country's spectrum policy, and then configures appropriate communication parameters: for licensed bands, traditional grant-based transmission is used; for unlicensed bands, LBT mechanisms are enabled. This localized adaptation ensures that data transmission is performed with the correct protocol for each band type, maintaining both productivity and reliability.
Data Source
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AI summary
Provided are a communication method and device. The method includes: a terminal device receives, from a network device, indication information indicating a working frequency band attribute or system attribute of the network device, the working frequency band attribute representing whether a working frequency band of the network device is a licensed or unlicensed frequency band and the system attribute representing whether the network device works in a licensed or unlicensed frequency band system; and the terminal device performs communication with the network device according to the working frequency band attribute or the system attribute. When roaming in different countries or regions, the terminal device can effectively know whether a frequency band of a network presently to access is an unlicensed or licensed frequency band and thus execute an operation to implement effective data transmission in different frequency bands even though different spectrum division manners are adopted there.