Rank Determination in 5G Wireless Communication Systems
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Solution Overview
Problem
In 5G communication systems, there is a need for a method to determine rank-related information between User Equipment (UE) and an evolved Node B (eNB) when the layer information indicated by the UE capability information differs from the layer information indicated by the frequency band combination information, particularly for transmission modes TM3 and TM4.
Innovation Solution
A method where the UE reports its support for rank-3 and rank-4 transmission modes to the eNB, and based on agreed rules, both entities determine and communicate rank-related information, minimizing signaling overhead by allowing UEs that support or do not support these ranks to use different determination rules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE reports detailed capability information including layer information for each frequency band combination, then the eNB can accurately determine rank-related information, but the signaling overhead increases
Solution Approach 1:
The patent extracts only the necessary capability information (support for rank-3 and rank-4 in TM3 and TM4) from the full UE capability set, rather than reporting all detailed layer information for each frequency band combination. This selective extraction reduces signaling overhead while maintaining sufficient accuracy for rank determination.
Solution Approach 2:
Instead of the UE reporting what it supports in detail, the approach inverts the method by having the UE report what transmission modes it supports (TM3 and TM4 with rank-3/4), and allowing the eNB to infer rank-related information based on this inverted reporting structure and agreed-upon rules.
2Adaptability or versatility
If the UE and eNB use different determination rules for rank-related information, then adaptability to various UE capabilities is improved, but system complexity increases
Solution Approach 1:
The patent applies different determination rules locally based on UE capability characteristics. UEs that support rank-3 and rank-4 in TM3 and TM4 follow one determination rule, while UEs that do not support these ranks follow another rule. This local differentiation achieves adaptability without requiring a completely complex unified system.
Solution Approach 2:
The system changes the determination rule parameter based on UE capability parameters. When the UE indicates support for specific transmission modes and ranks, the determination rule parameter switches accordingly, allowing adaptability through parameter variation rather than structural complexity.
Data Source
AI summary
The present disclosure relates to a 5G or pre-5G communication system for supporting a higher data transmission rate than a 4G communication system such as LTE. The present invention relates to a method and a device for determining rank-related information, the method of user equipment according to the present invention comprising: a step of transmitting, to an eNB, a user equipment capability information message including capability information of the user equipment; a step of receiving a configuration message from the eNB; and a step of determining rank-related information on the basis of whether or not layer-related information is included in the configuration message.