Sidelink Signal Subframe Symbol Allocation for Latency Reduction
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Solution Overview
Problem
Current wireless communication systems, such as LTE, face challenges in efficiently transmitting and receiving sidelink signals due to limitations in subframe configuration and resource allocation, which affect data transmission latency and interference control.
Innovation Solution
A method and apparatus for transmitting and receiving sidelink signals in a next-generation wireless communication system, where user equipment receives a first sidelink control signal in a predetermined symbol of a subframe, followed by the sidelink data signal, and responds with a second sidelink control signal, optimizing symbol allocation to minimize latency and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional subframe configuration is used for sidelink signal transmission, then resource allocation is simplified, but data transmission latency increases and interference control becomes difficult
Solution Approach 1:
The subframe is segmented into multiple slots, with each slot containing multiple symbols. This segmentation allows flexible allocation of symbols for different purposes (downlink control, sidelink data, uplink control) within the same subframe, enabling reduced latency by placing sidelink signals in earlier symbols while maintaining manageable complexity through standardized slot structures.
Solution Approach 2:
The patent implements dynamic symbol allocation where the number of symbols allocated to downlink control, sidelink data, and uplink control can vary flexibly within each subframe based on traffic requirements. This dynamic configuration allows the system to adapt to different latency requirements and interference conditions, improving time efficiency while using standardized dynamic signaling mechanisms to control complexity.
2Reliability
If more symbols are allocated for downlink control signals, then control coverage is improved, but available symbols for sidelink data transmission decrease
Solution Approach 1:
The system dynamically adjusts the number of symbols allocated to downlink control signals versus sidelink data symbols based on real-time requirements. The base station can flexibly configure the control region size, allowing more symbols for control when reliability is critical, or more symbols for data when productivity is the priority, with changes signaled through standardized RRC configuration.
Solution Approach 2:
Different symbol allocations are applied locally within specific subframes or resource pools based on local requirements. Certain subframes can have more control symbols for reliable control coverage, while other subframes allocate more symbols to sidelink data for high productivity, allowing both requirements to be satisfied in different locations of the time-frequency resource space.
3Productivity
If sidelink control signals and data signals are transmitted in the same subframe, then transmission efficiency is improved, but interference control becomes more difficult
Solution Approach 1:
The subframe is divided into distinct regions: downlink control symbols, sidelink data symbols, and uplink control symbols. This segmentation allows simultaneous transmission of control and data signals in the same subframe with clear separation, improving transmission efficiency while reducing interference through spatial and temporal partitioning of resources.
Solution Approach 2:
The patent introduces guard symbols or reference signals as intermediary elements between control signals and data signals within the same subframe. These intermediaries help isolate and manage interference between different signal types, enabling efficient simultaneous transmission while maintaining acceptable interference levels through standardized interference management techniques.
Data Source
AI summary
The present application provides a method for transmitting and receiving, by a terminal, a sidelink signal through a subframe including a plurality of symbols in a wireless communication system. Specifically, the method comprises the steps of receiving a first sidelink control signal including symbol information for a sidelink data signal, on a predetermined first symbol of a subframe; receiving the sidelink data signal on the subframe according to the first sidelink control signal; and transmitting a second sidelink control signal including response information for the sidelink data signal, on a second symbol of the subframe, wherein the first symbol is determined under the assumption that a maximum number of symbols reserved for a downlink control signal exist on the subframe, and the second symbol is a symbol immediately before a symbol reserved for an uplink control signal on the subframe.