Codebook Indication Signaling for SCMA Downlink Allocation
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Solution Overview
Problem
In non-orthogonal multiple access systems like SCMA, there is a challenge in notifying terminal devices of allocated codebooks for downlink data streams, as the selection and allocation of codebooks are typically managed by the network device without direct participation from the terminal device.
Innovation Solution
A method and apparatus for determining and transmitting codebook indication information to terminal devices, where codebooks are used to send downlink data streams, including multidimensional complex vectors indicating mapping relationships between data and modulation symbols, allowing terminal devices to decode received data streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the network device manages codebook selection and allocation without terminal device participation, then the network device can control downlink data stream transmission, but the terminal device cannot determine which codebooks are allocated to it
Solution Approach 1:
The patent introduces codebook indication information as an intermediary that carries codebook allocation information from the network device to the terminal device. This intermediary element resolves the information loss by providing a dedicated signaling mechanism that bridges the gap between network device control and terminal device knowledge of allocated codebooks.
Solution Approach 2:
The patent establishes a feedback loop where the network device sends codebook indication information to the terminal device, enabling the terminal to determine which codebooks are allocated. This feedback mechanism ensures that the terminal device receives necessary information about codebook allocations made by the network device.
2Productivity
If multiple codebooks are allocated to different data streams on the same time-frequency resource, then the network capacity increases, but the complexity of codebook management and indication increases
Solution Approach 1:
The patent segments codebooks into different codebook groups, where each group corresponds to specific data streams. This segmentation allows the network device to manage multiple codebooks systematically by organizing them into groups, reducing the complexity of tracking and indicating which codebooks are allocated to which data streams while supporting increased network capacity.
3Adaptability or versatility
If codebooks with different numbers of modulation symbols are allocated, then the system can support diverse data stream requirements, but the terminal device cannot determine the total quantity of modulation symbols
Solution Approach 1:
The codebook indication information serves as an intermediary that carries not only codebook identification but also the total quantity of modulation symbols information. This allows the terminal device to determine the modulation symbol characteristics of allocated codebooks even when they have different numbers of symbols, maintaining adaptability while preventing information loss.
Data Source
AI summary
The present invention discloses an indication information transmission method and apparatus. The method includes: determining, in one or more codebooks, a first codebook used to send a first downlink data stream to a terminal device; determining one or more second codebooks used to send a second downlink data stream; determining codebook indication information used to indicate the first codebook and the one or more second codebooks; and sending the codebook indication information to the terminal device.