LTE D2D Control Information Multiplexing
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Solution Overview
Problem
Current LTE Rel-12 D2D communication specifications require dedicated resources for transmitting control information, leading to inefficient resource usage and increased decoding latency, especially in V2x communication scenarios where low latency is critical for safety messages.
Innovation Solution
Multiplexing control information and data within the same LTE subframe, using correlated resource allocations and mapping control information parameters to DMRS sequences, allows for improved resource utilization and reduced latency by eliminating the need for blind decoding and dedicated control information resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated resources are allocated for control information transmission, then control information can be reliably transmitted, but resource usage efficiency decreases and decoding latency increases
Solution Approach 1:
The patent merges control information and data transmission into the same time-frequency resources. Control information is multiplexed with data in the same LTE subframe, allowing both to share resources efficiently. This eliminates dedicated control resources while maintaining reliability through joint coding and multiplexing schemes.
Solution Approach 2:
The patent enables data resources to serve dual purposes: carrying both data and control information. The same resource blocks used for data transmission also carry control information through multiplexing, making the resources universal and eliminating the need for separate dedicated control channels.
2Reliability
If dedicated resources are allocated for control information transmission, then control information can be reliably transmitted, but decoding latency increases
Solution Approach 1:
By combining control information and data in the same subframe, the patent eliminates the time gap between control information transmission and data transmission. This merging approach reduces decoding latency as receivers can process both simultaneously rather than sequentially, while maintaining reliability through joint transmission schemes.
Solution Approach 2:
The patent embeds control information within the data transmission structure in advance, so that control information is already available when data arrives. This preliminary integration eliminates the need for separate control channel processing steps, reducing overall decoding latency while ensuring control information is reliably transmitted.
3Productivity
If control information parameters are mapped to DMRS sequences, then resource utilization improves, but system complexity increases
Solution Approach 1:
The patent changes the representation parameters of control information by mapping control parameters to DMRS sequence properties (such as cyclic shifts or orthogonal cover codes). This parameter transformation allows control information to be conveyed through existing reference signal structures, improving resource utilization while managing complexity through standardized mapping rules.
Data Source
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AI summary
The present disclosure pertains to a transmitter terminal (10), the transmitter terminal (10) being adapted for D2D communication and/or transmission. The transmitter terminal (10) is further being adapted for transmitting multiplexed control information and data, wherein the control information and data are multiplexed based on a mapping. The present disclosure also pertains to related devices and methods.