V2X Resource Allocation for Half-Duplex Packet Reception
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Solution Overview
Problem
Current communication systems, particularly in 5G networks, face challenges in achieving low latency and high data rate requirements for V2X communications, especially in scenarios where terminal devices operate outside network coverage, leading to delays and reduced packet reception ratios.
Innovation Solution
A communication device with a subgroup management unit that dynamically allocates resources in a frequency and time axis direction, allowing for initial and retransmission of control signals/data using different resource positions, and a transmission control unit that adjusts resource sizes based on packet size and delay needs, enabling efficient data transmission even in half-duplex modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If mode 4 autonomous control is used for V2X resource allocation, then transmission delay is reduced and strict delay requests can be satisfied, but packet reception ratio deteriorates due to half-duplex limitations and lack of coordinated retransmission
Solution Approach 1:
The patent applies preliminary action by pre-allocating retransmission resources alongside initial transmission resources in a coordinated manner. The base station assigns both initial and retransmission resources to terminals before transmission occurs, ensuring that retransmission opportunities are already prepared and available, thus improving packet reception ratio without adding transmission delay.
Solution Approach 2:
The patent implements feedback mechanisms where terminals report transmission status and channel conditions to the base station. The base station uses this feedback information to dynamically adjust and allocate retransmission resources, ensuring that retransmissions are coordinated effectively to improve packet reception ratio while maintaining low latency.
2Reliability
If multiple transmission opportunities are provided for half-duplex terminals, then packet reception ratio improves, but resource allocation complexity increases
Solution Approach 1:
The patent merges initial transmission and retransmission resource allocation into a single coordinated process managed by the base station. Instead of treating them as separate operations that would increase complexity, the system combines resource selection, sensing, and allocation into an integrated framework where the base station centrally manages both transmission opportunities, simplifying the overall resource allocation complexity while ensuring multiple transmission opportunities for half-duplex terminals.
3Reliability
If resource sensing and exclusion are performed to avoid collisions, then transmission reliability improves, but transmission delay increases due to resource selection time
Solution Approach 1:
The patent applies preliminary action by having the base station pre-allocate and indicate specific transmission resources to terminals in advance. Terminals receive resource allocation information from the base station that already accounts for collision avoidance, eliminating the need for terminals to perform time-consuming sensing and exclusion procedures themselves. This pre-indicated resource allocation maintains transmission reliability while significantly reducing resource selection time.
Data Source
AI summary
A communication device including, a subgroup management unit allocates each of N resources in the frequency axis direction at a first position in the time axis direction to each communication device as a first resource, allocates each of second to NTth resources in the time axis direction at a first position in the frequency axis direction to each of the communication devices as the second resource, allocates each of the second to Nth resources in the frequency axis direction at a second position in the time axis direction to each of other communication devices as the first resource, and allocates each of the third to NTth resources in the time axis direction at the second position in the frequency axis direction to each of the other communication devices as the second resource, and repeat this operation to allocate the first and second resources to a plurality of communication devices.