Multi-Antenna Reference Signal Sequence Discrimination
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Solution Overview
Problem
In multi-antenna wireless communication systems, there is a lack of clear definitions for the parameter n_RNTI used in scrambling sequence initialization for various channels, such as PUSCH, PUCCH, PDSCH, and UE-specific RS, which affects the transmission of reference signals.
Innovation Solution
A method is proposed where a base station generates a pseudo-random sequence using a first and second m-sequence, with the second m-sequence having an initial value containing a parameter for discriminating inter-user reference signal sequences, and transmits this sequence through different antenna ports, with the parameter k being signaled via a downlink physical control channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a plurality of antennas are used to increase transmission rate and capacity, then system performance is improved, but ambiguity in parameter definitions (such as n_RNTI) causes transmission reliability issues
Solution Approach 1:
The patent modifies the parameter definition of n_RNTI by incorporating the antenna port index into the initialization value calculation. Specifically, the initialization value is changed from a fixed value to one that varies with the antenna port index, thereby resolving the parameter definition ambiguity while maintaining high transmission rates in multi-antenna systems
2Productivity
If reference signal sequences are transmitted through multiple antenna ports, then system coverage and capacity are enhanced, but signal discrimination between different users becomes difficult without clear parameter definitions
Solution Approach 1:
The patent applies local quality by making the reference signal sequence specific to each antenna port through the antenna port index parameter. This allows each antenna port to have differentiated signal characteristics, enabling effective signal discrimination between different users and ports while maintaining enhanced system capacity
3Measurement precision
If the second m-sequence initial value is clearly defined with specific parameters, then inter-user reference signal sequence discrimination is improved, but the complexity of sequence generation increases
Solution Approach 1:
The patent implements preliminary action by pre-defining the initialization value calculation method that incorporates the antenna port index. This allows the system to automatically generate differentiated reference signal sequences without complex real-time processing, achieving high discrimination precision while keeping generation complexity manageable through standardized procedures
Data Source
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AI summary
The present application discloses a method in which a base station transmits a reference signal sequence in a wireless communication system. In detail, the method comprises the steps of: generating a pseudo-random sequence using a first m-sequence and a second m-sequence; generating the reference signal sequence using the pseudo-random sequence; and transmitting the reference signal to a mobile station via antenna ports different from one another. The second m-sequence has an initial value containing parameters for discriminating reference signal sequences among users.