Codebook Indication Segmentation for SCMA Uplink Capacity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless cellular networks, particularly in 5G systems, there is a challenge in effectively informing terminal devices about the assigned codebook for uplink data streams in non-orthogonal multiple access systems like SCMA, which is crucial for improving network capacity and spectral efficiency.
Innovation Solution
A method and apparatus for transmitting codebook indication information from a network device to a terminal device, where the codebook includes multidimensional complex vectors representing mapping relationships between data and modulation symbols, including zero and non-zero modulation symbols, to enable the terminal device to determine the appropriate codebook for data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If non-orthogonal multiple access technology is adopted to increase network capacity, then spectral efficiency and number of users are improved, but the complexity of codebook assignment and indication increases
Solution Approach 1:
The codebook is divided into multiple codebook sets, each containing multiple codebooks. The indication information is segmented into multiple parts: first codebook set indication information, second codebook set indication information, and third codebook indication information. This segmentation allows the terminal to efficiently determine the correct codebook through hierarchical indication rather than searching through all possible codebooks, reducing complexity while maintaining high network capacity.
2Adaptability or versatility
If multiple codebooks are provided for different modulation schemes, then adaptability to different channel conditions is improved, but the difficulty of indicating the selected codebook increases
Solution Approach 1:
The patent introduces a hierarchical dimension to codebook indication by organizing codebooks into codebook sets and further into codebook groups. The indication information is distributed across multiple dimensions: first codebook set indication, second codebook set indication, and third codebook indication. This multi-dimensional indication structure makes it easier for the terminal to locate the correct codebook by narrowing down the search space step by step, reducing the difficulty of codebook indication while maintaining adaptability to different channel conditions.
3Speed
If codebook indication information is transmitted through downlink control information, then the terminal can quickly acquire codebook information, but the overhead for codebook management increases
Solution Approach 1:
The patent extracts only the necessary indication information from the complete codebook configuration and transmits it through downlink control information. Specifically, only the first codebook set indication information, second codebook set indication information, and third codebook indication information are transmitted, rather than transmitting the entire codebook. This extraction approach enables the terminal to quickly acquire the necessary codebook information for data transmission while minimizing the overhead consumed by codebook management control signals.
Data Source
AI summary
Embodiments disclose a method and an apparatus for transmitting indication information. The method includes: determining, according to one or more codebooks, a first codebook to be used by a terminal device to send an uplink data stream; determining codebook indication information used to indicate the first codebook; and determining codebook indication information used to indicate the first codebook. For the method and the apparatus for transmitting indication information according to embodiments of the present invention, a network device determines, according to one or more codebooks, a first codebook to be used by a terminal device to send an uplink data stream, determines codebook indication information used to indicate the first codebook, and sends the codebook indication information to the terminal device, so that the terminal device can determine the first codebook assigned by the network device and transmit data by using the first codebook.