V2X Subframe Resource Allocation Excluding Last Symbol
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Solution Overview
Problem
In V2X communication, the increased reference signal mapping, automatic gain control symbols, and transmission/reception switching time reduce available resources for data transmission, leading to excessive coding rates and inefficiencies in current wireless communication systems.
Innovation Solution
A method for transmitting V2X data by mapping it to resources in a subframe excluding the last symbol, with the first symbol used for automatic gain control and the last symbol reserved for transmission/reception switching time, determining transport block size based on the number of resource blocks and modulation and coding scheme, and using effective resource blocks to optimize resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reference signals are mapped to more resource blocks and additional symbols are employed for AGC and transmission/reception switching, then V2X communication reliability is improved, but available resources for data transmission are reduced
Solution Approach 1:
The patent extracts the last symbol of the subframe from the data transmission resources and dedicates it specifically for transmission/reception switching time. This separation ensures that critical switching operations have dedicated resources while data transmission utilizes only the remaining symbols, resolving the conflict between reliability requirements and resource availability.
Solution Approach 2:
The subframe structure is segmented into distinct functional regions: symbols for AGC, symbols for reference signals, symbols for data transmission, and the last symbol for transmission/reception switching. This segmentation allows each function to operate with dedicated resources, improving overall system reliability while optimizing resource utilization for data transmission.
2Productivity
If higher modulation order such as 64 QAM is used for V2X communication, then data transmission capacity is increased, but coding rate increases excessively
Solution Approach 1:
The patent changes the parameter of resource allocation by excluding the last symbol from data transmission, thereby adjusting the total number of available resource elements. This parameter change allows the system to maintain higher modulation orders like 64 QAM for increased capacity while compensating for the coding rate increase by optimizing the transport block size calculation based on the reduced resource availability.
3Productivity
If resource elements in the last symbol are included in mapping, then resource utilization is maximized, but transmission/reception switching time is compromised
Solution Approach 1:
The patent extracts the last symbol from the set of symbols available for data mapping and reserves it exclusively for transmission/reception switching operations. This extraction ensures that switching time requirements are met with dedicated resources, while data transmission efficiently utilizes all remaining resource elements, achieving optimal resource utilization without compromising switching reliability.
Data Source
AI summary
Provided is a method for transmitting a signal by a terminal for vehicle-to-everything (V2X) communication in a wireless communication system and a terminal using the same method. The method comprises: mapping V2X data to a resource of a subframe including multiple symbols in a time domain; and transmitting the mapped V2X data to another terminal, wherein, in the step of mapping, resource elements included in a last symbol of the subframe are excluded.