Uplink Reference Signal Transmission Using Virtual Cell IDs
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Solution Overview
Problem
The increasing number of user equipment (UEs) and data/control information transmitted/received by eNBs in wireless communication systems poses a challenge in efficiently utilizing finite radio resources for uplink/downlink data and control information transmission/reception.
Innovation Solution
A method for transmitting an uplink reference signal that supports enhanced uplink transmission, involving the use of a virtual cell ID for generating DMRS sequences, ensuring orthogonality between uplink DMRSs in a multi-cell environment, and dynamic indication of cell IDs for PUSCH and PUCCH DMRS sequences through higher-layer signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of UEs served by an eNB increases to satisfy growing data throughput demands, then data throughput capacity improves, but radio resource efficiency deteriorates due to finite available resources
Solution Approach 1:
The patent segments the uplink DMRS sequences by introducing different virtual cell IDs for PUCCH and PUSCH transmissions. This segmentation allows multiple UEs to be served simultaneously with orthogonal reference signals, increasing productivity while maintaining radio resource efficiency through proper resource division.
2Productivity
If multi-cell cooperative communication is introduced to increase data throughput, then throughput capacity improves, but system complexity increases due to coordination requirements between multiple eNBs
Solution Approach 1:
The patent applies universality by using the same virtual cell ID mechanism for both PUCCH and PUSCH DMRS sequences. This multi-functional approach enables coordinated multi-point reception across multiple eNBs while maintaining a unified, relatively simple system architecture that does not require fundamentally different mechanisms for different functions.
3Reliability
If uplink CoMP operations are supported to enhance reception performance, then reception reliability improves, but signal processing complexity increases due to multi-point coordination
Solution Approach 1:
The patent uses parameter changes by dynamically indicating virtual cell IDs through higher-layer signaling for PUSCH and using predefined rules for PUCCH. This allows the system to adapt reference signal characteristics for CoMP operations without requiring complex real-time processing changes, thereby improving reliability while controlling signal processing complexity.
Data Source
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AI summary
The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting an uplink signal. A method for transmitting an uplink signal at a UE in a wireless communication system includes, when a virtual cell ID for a reference signal for demodulation of a physical uplink channel is provided, generating a sequence of the reference signal on the basis of the virtual cell ID, and transmitting the generated reference signal to an eNB. A sequence hopping pattern of the reference signal can be determined on the basis of the virtual cell ID.