Uplink Reference Signal Parameter Determination for Interference Mitigation
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Solution Overview
Problem
There is a lack of description in existing wireless communication systems regarding the procedure for base stations and terminals to determine parameters related to uplink signals or uplink reference signals, which hinders efficient communication.
Innovation Solution
The proposed solution involves a configuration of base stations and terminals with specific units such as data control, transmit data modulation, radio, scheduling, channel estimation, and antenna units, which enable the determination and management of uplink signal and reference signal parameters, allowing for efficient communication by orthogonalizing and randomizing these signals to mitigate interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink signals and reference signals are transmitted from multiple terminals using the same frequency and time resources, then spectral efficiency is improved, but interference between signals increases
Solution Approach 1:
The patent segments the reference signal space by introducing multiple orthogonal cover codes (OCCs) that divide the reference signal resources into distinct orthogonal segments. Each terminal is assigned a unique OCC sequence, which segments the overall signal space into non-interfering portions, allowing multiple terminals to transmit simultaneously without mutual interference.
Solution Approach 2:
The patent extends the orthogonality dimension from traditional single-dimensional approaches to multi-dimensional orthogonal cover codes. By utilizing multiple dimensions (e.g., time-domain, frequency-domain, and code-domain combinations), the system creates additional orthogonal layers that enable more terminals to share the same time-frequency resources while maintaining signal separation.
2Reliability
If demodulation reference signals are orthogonalized to mitigate interference, then signal quality is improved, but system complexity increases
Solution Approach 1:
The patent uses copying by generating orthogonal reference signals through systematic replication and transformation of base sequences. Multiple orthogonal cover codes are derived from fundamental orthogonal sequences through standardized mathematical transformations, allowing the system to create diverse orthogonal signals from a unified template, thereby maintaining signal quality while controlling complexity through pattern reuse.
Solution Approach 2:
The patent achieves orthogonality by systematically varying parameters of reference signals, including cyclic shifts, orthogonal cover code indices, and sequence lengths. These parameter changes enable the generation of multiple orthogonal signal variants from a single base sequence, improving signal quality through parameter diversification without requiring fundamentally different signal structures.
3Reliability
If multiple base stations cooperate in CoMP transmission, then coverage and reliability are improved, but coordination overhead and complexity increase
Solution Approach 1:
The patent creates a universal reference signal framework that functions across multiple base stations in CoMP scenarios. The same orthogonal cover code structure and sequence generation methods are universally applied at all cooperating base stations, enabling consistent reference signal behavior across the cooperative network. This universality simplifies inter-base-station coordination by establishing a common signaling language and reducing the need for complex individualized coordination protocols.
Data Source
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AI summary
There are provided a terminal device, a base station device, and an integrated circuit that enable a base station device and a terminal device to determine parameters related to uplink signals or uplink reference signals and to perform efficient communication. A terminal device that transmits a demodulation reference signal associated with a physical uplink shared channel includes determining a value related to a cyclic shift on the basis of a value of a parameter configured by a higher layer, determining the value related to the cyclic shift on the basis of a physical layer cell identity, and generating a sequence of the demodulation reference signal on the basis of the value related to the cyclic shift, wherein the value related to the cyclic shift is determined on the basis of the physical layer cell identity in a case where 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 is performed.