LTE Downlink Carrier Configuration for NR-LTE Uplink Reference
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Solution Overview
Problem
In the NR-LTE coexistence scenario, the downlink reference information from NR high-frequency carriers cannot accurately represent the features of the uplink carrier, leading to degraded system performance due to the significant frequency difference between NR and LTE systems.
Innovation Solution
The terminal device obtains configuration information from an LTE low-frequency downlink carrier carried on the NR high-frequency downlink carrier to transmit uplink signals, rather than using NR high-frequency downlink carrier information, thereby improving system performance by using accurate reference information for uplink transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If downlink reference information from NR high-frequency carriers is used for uplink transmission, then the uplink coverage problem is resolved through NR-LTE coexistence, but the system performance is degraded because the reference information cannot accurately represent the uplink carrier features
Solution Approach 1:
The patent segments the reference information source by frequency band, using separate downlink carriers for different frequency ranges. LTE downlink carriers (below 6GHz) provide reference information for LTE uplink carriers, while NR downlink carriers (above 6GHz) provide reference information for NR uplink carriers. This segmentation ensures that reference information accurately represents the characteristics of the corresponding uplink carrier frequency.
Solution Approach 2:
The patent applies local quality by matching reference information sources to specific frequency bands. Instead of using a single universal reference source, the system uses LTE downlink reference signals for LTE uplink frequencies and NR downlink reference signals for NR uplink frequencies, ensuring that the reference information locally matches the characteristics of each frequency band.
2Adaptability or versatility
If NR high-frequency downlink carrier configuration information is used to obtain downlink reference information for LTE uplink transmission, then the NR-LTE coexistence deployment is enabled, but the system performance is degraded due to significant frequency differences
Solution Approach 1:
The patent introduces an intermediary mechanism through the network device that receives uplink configuration information from the terminal and determines the appropriate downlink configuration information. This intermediary process ensures that the correct downlink carrier (LTE or NR) is selected based on the uplink carrier type, enabling NR-LTE coexistence while maintaining system performance through accurate frequency-matched reference information.
3Ease of operation
If configuration information from serving carrier is used, then the terminal device can transmit uplink signals, but the reference information does not accurately represent the uplink carrier features when there is great frequency difference
Solution Approach 1:
The patent implements dynamic selection of downlink configuration information based on the uplink carrier type. The network device dynamically determines whether to provide LTE or NR downlink configuration information based on whether the terminal is transmitting on an LTE or NR uplink carrier, ensuring that the reference information dynamically matches the current transmission frequency band.
Data Source
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AI summary
Embodiments of this application provide a method and a device for transmitting and receiving information. The method includes: receiving, by a terminal device on a first downlink carrier, a broadcast message transmitted by a network device, where the broadcast message includes second downlink configuration information corresponding to a second downlink carrier, the second downlink configuration information includes second downlink frequency information and/or physical cell identifier information of the second downlink carrier, the first downlink carrier and a second uplink carrier are serving carriers of the terminal device, the second downlink carrier is not a serving carrier of the terminal device, and the second downlink carrier and the second uplink carrier are paired carriers on a system level. Signal transmission on an LTE low-frequency uplink carrier based on LTE low-frequency downlink carrier configuration information carried on an NR high-frequency downlink carrier helps improve system performance in an NR-LTE coexistence scenario.