Uplink Reference Signal Indication for Flexible Transmission
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Solution Overview
Problem
In LTE communication systems, the transmission of uplink reference signals is limited by the need for periodic transmission on the last data symbol of the subframe, leading to inflexibility and poor reception quality due to mismatched transmission parameters, especially in high-frequency carrier communication where spatial attenuation is significant.
Innovation Solution
A method and apparatus for indicating uplink reference signal information through signaling, including transmission manner, resource, type, cell ID, or virtual cell ID, allowing flexible transmission and ensuring successful reception by informing the terminal of transmission parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If uplink reference signal is transmitted periodically on the last data symbol of subframe, then transmission structure is simple, but transmission flexibility is poor and reception quality is insufficient
Solution Approach 1:
The patent applies dynamics by transforming the static periodic transmission structure into a dynamic flexible transmission structure. The base station can dynamically indicate transmission parameters (time frequency resources, antenna ports, cyclic shifts, etc.) through downlink control information, allowing the uplink reference signal transmission to adapt to different channel conditions and service requirements in real-time, thereby resolving the contradiction between structural simplicity and transmission flexibility.
Solution Approach 2:
The patent changes multiple transmission parameters including time frequency resource allocation, antenna port selection, cyclic shift values, and power control parameters. These parameter changes enable the system to adapt transmission characteristics according to channel quality and service types, improving reception quality while maintaining operational simplicity through standardized parameter indication mechanisms.
2Productivity
If high-frequency carrier communication is used, then available bandwidth increases and high-speed data communication is achieved, but spatial attenuation losses increase significantly
Solution Approach 1:
The patent applies local quality by enabling different transmission parameters for different spatial directions and channel conditions. Through beamforming techniques and spatial multiplexing, the system can focus transmission energy in specific directions where channel conditions are favorable, compensating for spatial attenuation losses in high-frequency communication while maintaining high data transmission rates.
Solution Approach 2:
The patent combines multiple transmission techniques including beamforming, spatial multiplexing, and adaptive modulation to create a composite transmission system. This composite approach allows the system to exploit both the high bandwidth capability of high-frequency carriers and the directional gain needed to compensate for spatial attenuation, achieving high-speed communication with improved energy efficiency.
3Measurement precision
If multiple antennas are used for non-precoded SRS transmission, then uplink CSI measurement capability is improved, but SRS resource requirements increase and system capacity decreases
Solution Approach 1:
The patent makes the uplink reference signal structure universal by designing it to support both single-antenna and multi-antenna scenarios through the same basic framework. The standardized resource indication mechanism can accommodate different numbers of antennas, precoding configurations, and transmission modes without requiring separate resource allocations, thereby reducing overall SRS resource requirements while maintaining measurement precision.
Solution Approach 2:
The patent implements partial action by allowing the system to activate only the necessary number of SRS resources based on actual service requirements. When multi-antenna CSI measurement is needed, only the required subset of antenna ports and resources is activated, avoiding the overhead of configuring and transmitting on all possible resources, thus reducing SRS resource consumption while maintaining measurement capability.
Data Source
AI summary
A method and apparatus for indicating uplink reference signal information are provided. The method includes: indicating uplink reference signal information to a terminal through a signaling. The uplink reference signal information includes at least one of the following information: a transmission manner in which the terminal transmits an uplink reference signal, a transmission resource used by the terminal to transmit the uplink reference signal, a type of the uplink reference signal transmitted by the terminal, a cell identifier (ID) used by the uplink reference signal, and a virtual cell ID used by the uplink reference signal. Further provided in the embodiments of the present disclosure is a storage medium.