Uplink Reference Signal Parameter Management for Interference Reduction
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Solution Overview
Problem
There is no established procedure for a base station and a terminal to determine parameters related to an uplink reference signal, leading to inefficient communication in radio communication systems.
Innovation Solution
A communication method and apparatus that enable a base station and a terminal to determine and communicate uplink reference signal parameters, including sequence group hopping and sequence hopping, to orthogonalize and randomize reference signals, reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink reference signals are transmitted by multiple terminals using the same frequency and time resources, then spectral efficiency is improved, but interference occurs between reference signals
Solution Approach 1:
The patent applies parameter changes by modifying the cyclic shift parameter of reference signals. Specifically, different terminals are assigned different cyclic shift values (e.g., n_cs) to their reference signals, which transforms the signal characteristics in the time-frequency domain. This parameter modification allows multiple terminals to transmit reference signals simultaneously on the same resources while maintaining orthogonality, thus resolving the interference problem while preserving spectral efficiency.
2Object-affected harmful factors
If sequence group hopping is enabled for uplink reference signals, then interference randomization is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamics by introducing sequence group hopping, where the reference signal sequence group changes dynamically across different time slots or subframes. Instead of using a static sequence, the system dynamically selects from multiple possible sequences based on hopping patterns, which randomizes interference over time while maintaining a relatively simple implementation through predefined hopping rules.
Solution Approach 2:
The patent applies periodic action through sequence group hopping patterns that repeat at regular intervals. The reference signal sequences follow periodic hopping behaviors defined by specific mathematical patterns, which provides interference randomization through predictable periodic changes rather than completely random variations, balancing performance improvement with implementation simplicity.
3Productivity
If multiple parameters are configured for reference signal determination, then communication efficiency is improved, but signaling overhead increases
Solution Approach 1:
The patent applies universality by designing a multi-functional parameter configuration system where a single set of parameters serves multiple purposes. The configured parameters (such as cyclic shift values, hopping patterns, and sequence group indices) not only determine reference signal characteristics but also implicitly convey terminal identification and resource allocation information. This multi-functionality reduces the need for separate signaling for each purpose, thereby improving communication efficiency while minimizing signaling overhead.
Data Source
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AI summary
A terminal apparatus, a base station apparatus, a communication method, an integrated circuit, and a radio communication system are provided that enable a base station apparatus and a terminal apparatus to determine parameters relating to an uplink reference signal and efficiently communicate with each other. A terminal apparatus that transmits a demodulation reference signal, the terminal apparatus comprising: means for receiving a cell-specific parameter used for enabling or disabling a sequence group hopping, means for receiving a user-equipment-specific parameter used for disabling the sequence group hopping, and means for generating a sequence of the demodulation reference signal on the basis of the enabled or disabled sequence group hopping, wherein, in a case that a transmission on the physical uplink shared channel corresponding to a downlink control information format to which CRC parity bits scrambled by a temporary C-RNTI are attached, the sequence group hopping is enabled or disabled on the basis of the cell-specific parameter.