Indication Information Transmission for Uplink Data in Non-Orthogonal Access
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In non-orthogonal multiple access systems, such as those using low-density signature (LDS) technology, there is a challenge in effectively notifying terminal devices of the allocated data transmission information, including signature sequences and modulation constellations, which are crucial for efficient data transmission.
Innovation Solution
A method and apparatus that determine and transmit indication information to terminal devices, specifying the signature sequences and modulation constellations used for uplink data streams, allowing terminal devices to perform amplitude and phase adjustments based on pre-designed matrices and sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If non-orthogonal multiple access technology is used to increase network capacity, then the quantity of accessible users and spectral efficiency are improved, but the complexity of notifying terminal devices of allocated data transmission information increases
Solution Approach 1:
The indication information is segmented into two parts: first indication information transmitted via downlink control information (DCI) that carries signature sequence index information, and second indication information transmitted via higher-layer signaling that carries modulation constellation information. This segmentation allows flexible transmission of different types of indication information through appropriate channels, resolving the contradiction between increasing network capacity and managing indication information complexity.
Solution Approach 2:
The network device pre-configures multiple signature sequences and modulation constellations, then uses indication information to point to pre-selected combinations. This preliminary preparation reduces the amount of real-time signaling needed, as the indication information only needs to specify indices rather than transmit complete configuration data, thereby reducing complexity while maintaining high network capacity.
2Measurement precision
If detailed data transmission information is allocated by network device, then data transmission accuracy is improved, but the signaling overhead increases
Solution Approach 1:
Instead of transmitting complete signature sequence and modulation constellation data, the system transmits index information that copies or references pre-configured data stored at both network device and terminal device. This indexing approach maintains data transmission accuracy by precisely identifying the allocated parameters while dramatically reducing signaling overhead, as indices require far fewer bits than complete parameter descriptions.
Solution Approach 2:
The network device and terminal device pre-configure and store multiple signature sequences and modulation constellations before actual data transmission. This preliminary action enables the system to reference pre-agreed parameters using compact index values, ensuring accurate data transmission information delivery while minimizing the signaling overhead required to convey allocation details.
Data Source
Figure 1~2a
Figure 2b~3
Figure 4
AI summary
The present invention discloses an indication information transmission method and apparatus. The method includes: determining a first signature sequence and a first modulation constellation that are used to transmit an uplink data stream by a terminal device; determining indication information that is used to indicate the first signature sequence and the first modulation constellation; and transmitting the indication information to the terminal device. According to the indication information transmission method and apparatus in embodiments of the present invention, a network device determines a first signature sequence and a first modulation constellation that are used to transmit an uplink data stream by a terminal device, determines indication information that is used to indicate the first signature sequence and the first modulation constellation, and transmits the indication information to the terminal device, so that the terminal device can determine the first signature sequence and the first modulation constellation that are allocated by the network device, and perform data transmission by using the first signature sequence and the first modulation constellation. In this way, a system network capacity can be effectively increased.