D2D Scrambling Sequence Relay Level Forwarding
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Solution Overview
Problem
In Device-to-Device (D2D) communication scenarios, especially in LTE systems, terminal devices face challenges with channel quality changes and distance, leading to inefficient resource utilization and failed communications due to unclear sequence relationships and repeated transmissions.
Innovation Solution
A method where a first device generates a scrambling sequence based on a scrambling seed indicating the relay level or information source of the information, allowing for efficient forwarding and reception of information by distinguishing relay levels and sources, thereby avoiding repeated transmissions and improving channel resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If D2D communication is performed between terminal devices that are relatively far from each other or with significant channel quality changes, then communication coverage is extended, but communication reliability deteriorates and cannot be performed
Solution Approach 1:
The patent introduces a relay device as an intermediary to forward information between terminal devices that are too far apart for direct communication. The relay device receives information from a first terminal device, processes it with relay level indication, and forwards it to a second terminal device, enabling extended coverage while maintaining communication reliability through multiple hops.
Solution Approach 2:
The patent implements multi-level relay forwarding where information can be relayed through multiple relay devices in sequence. Each relay device adds its level indication to the information, creating a nested structure of relay levels that allows information to traverse through multiple intermediate nodes to reach distant terminals.
2Length of stationary object
If information is forwarded through multiple relay devices without relay level indication, then communication coverage is extended, but resource utilization deteriorates due to repeated transmissions
Solution Approach 1:
The patent implements a feedback mechanism where receiving terminal devices check the relay level indication against their own relay levels. This feedback loop prevents devices at higher relay levels from re-forwarding information that has already been transmitted by devices at lower relay levels, eliminating redundant transmissions and improving channel resource utilization.
Solution Approach 2:
The patent applies partial action by having terminal devices selectively forward information based on relay level comparisons. Instead of all devices forwarding all received information, only devices whose relay level is lower than the indicated relay level forward the information, reducing unnecessary retransmissions while maintaining coverage.
3Reliability
If relay devices forward all received information, then information delivery is ensured, but transmission efficiency deteriorates due to repeated transmissions of same content
Solution Approach 1:
The patent uses relay level indication as a feedback mechanism to control information forwarding. Each relay device includes its level in the forwarded information, allowing receiving devices to determine whether to forward based on level comparison, ensuring information delivery while preventing redundant transmissions and improving efficiency.
4Device complexity
If scrambling sequences are not differentiated by relay level, then sequence generation is simplified, but sequence relationship clarity deteriorates leading to forwarding errors
Solution Approach 1:
The patent segments the scrambling sequence generation by incorporating relay level parameters into the sequence initialization. Different relay levels generate distinct scrambling sequences, allowing receiving devices to identify and process information from different relay levels correctly, maintaining sequence relationship clarity without significantly increasing generation complexity.
Data Source
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AI summary
The present invention discloses an information transmission method, a device, and a system, relates to the communications field, and resolves a problem in the prior art that in a D2D scenario, a terminal device cannot perform D2D communication due to a relatively long distance or a relatively significant change in channel quality. A specific solution is: generating, by a first device, a first scrambling sequence according to a first scrambling seed, where the first scrambling seed is generated according to a relay level or an information source of first information, scrambling the first information according to the first scrambling sequence, and sending the first information. The present invention is applied to information transmission.