D2D Communication Parameter Determination via Cross-Message Decoding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Device-to-device (D2D) communication in LTE networks faces challenges in efficient decoding of data, particularly when control information such as demodulation reference signaling and scrambling coding is not correctly received, which affects retransmission techniques like HARQ.
Innovation Solution
A method for decoding data in D2D messages using demodulation reference signaling and scrambling coding determined from a different message, allowing for backup decoding even if control information is missing or incorrect, by extracting information from a second D2D message with different reference signaling and scrambling coding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control information (demodulation reference signaling and scrambling coding) is transmitted separately with data in D2D communication, then data transmission can be performed, but decoding fails when control information is not correctly received
Solution Approach 1:
The patent uses a mediator approach by determining demodulation reference signaling and scrambling coding from a second D2D message that was successfully decoded, rather than directly from the failed first message. This intermediary method allows the receiver to obtain necessary decoding parameters from an alternative source (the second message) when the control information in the first message is corrupted, thereby maintaining decoding reliability without requiring complex error correction mechanisms in the control channel itself.
Solution Approach 2:
The patent applies preliminary action by pre-determining and storing demodulation reference signaling and scrambling coding parameters from successfully received messages before they are needed for decoding failed messages. The receiver maintains a repository of these parameters from previously decoded messages, allowing it to quickly retrieve and apply appropriate parameters when control information fails, avoiding the need for complex real-time parameter negotiation or retransmission protocols.
2Measurement precision
If control information is transmitted with each data message, then accurate demodulation can be achieved, but computational complexity increases when trying to decode multiple messages with different control information
Solution Approach 1:
The patent implements universality by enabling a single successfully decoded message to serve multiple functions: it not only provides its own data but also supplies the demodulation reference signaling and scrambling coding parameters needed to decode other messages. This multi-functional approach allows the receiver to use one message as both a data source and a parameter source, reducing the overall computational burden of decoding multiple messages with potentially corrupted control information.
Solution Approach 2:
The patent uses copying by replicating the useful control information parameters (demodulation reference signaling and scrambling coding) from a successfully decoded second message to assist in decoding the first message. Instead of requiring each message to carry its own complete set of control information, the system copies necessary parameters from an alternative source, reducing redundancy and computational complexity while maintaining demodulation accuracy.
3Reliability
If HARQ retransmission is implemented in D2D communication, then data reliability improves, but the system fails when control information for retransmitted data is not correctly received
Solution Approach 1:
The patent applies beforehand cushioning by preparing alternative sources of control information parameters (demodulation reference signaling and scrambling coding) from previously successfully received messages before they are needed for HARQ retransmission decoding. The receiver maintains a buffer of these parameters from earlier messages, providing a cushion or backup that prevents complete decoding failure when control information in retransmitted messages is lost or corrupted, thereby maintaining HARQ reliability.
Data Source
AI summary
This disclosure pertains to a method for operating a terminal (10) for a wireless communication network. The terminal (10) is adapted for device-to-device, D2D, communication. The method comprises decoding first data contained in a first D2D message based on a determination of first demodulation reference signaling and/or first scrambling coding associated to the first data, wherein the determination of demodulation reference signaling and/or scrambling coding is based on information extracted from a second D2D message different from the first D2D message, the second D2D message pertaining to second data to which second reference signaling and/or second scrambling coding is associated, the second reference signaling and/or second scrambling coding being different from the first reference signaling and/or second scrambling coding. The disclosure also pertains to related devices and methods.