Sidelink Transport Block Sizing by Physical Channel Overhead
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Solution Overview
Problem
Existing wireless communication systems face challenges in optimizing direct communication operations, particularly in determining efficient transport block sizes for sidelink communications to enhance reliability and reduce latency.
Innovation Solution
The method involves encoding and transmitting sidelink information based on a transport block size (TBS) that is determined by the overhead of a second physical sidelink channel, considering factors such as resource blocks, symbols, and control information overhead to optimize resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transport block size is increased to improve communication throughput, then productivity is improved, but reliability deteriorates due to increased error probability
Solution Approach 1:
The patent implements dynamic TBS determination by adjusting the transport block size based on real-time channel conditions, quality of service requirements, and resource availability. The TBS is not fixed but adapts to changing system states, allowing the system to optimize between throughput and reliability depending on current conditions.
Solution Approach 2:
The patent changes multiple parameters simultaneously to determine optimal TBS, including modulation and coding scheme (MCS), resource block allocation, number of antenna ports, and quality of service parameters. By coordinating changes across these parameters, the system achieves both high throughput and maintained reliability.
2Reliability
If transport block size is decreased to improve reliability, then reliability is improved, but productivity deteriorates due to reduced throughput
Solution Approach 1:
The system dynamically adjusts TBS downward only when channel conditions deteriorate or QoS requirements demand higher reliability, rather than using a statically small TBS. This dynamic approach ensures reliability when needed while maintaining high throughput when conditions permit.
Solution Approach 2:
The patent applies partial action by determining TBS based on the minimum necessary size to meet QoS requirements rather than always using maximum or minimum fixed sizes. This allows the system to use just enough resources to achieve reliability goals without excessive conservatism that would limit throughput.
3Adaptability or versatility
If overhead of physical sidelink channel is increased to accommodate more control information, then adaptability is improved, but loss of information deteriorates due to reduced payload capacity
Solution Approach 1:
The patent implements dynamic overhead allocation where the amount of control information transmitted adapts to the specific sidelink communication scenario. The overhead is increased only when additional control parameters are needed for specific applications, rather than always transmitting maximum control information.
Solution Approach 2:
Different levels of control information overhead are applied to different sidelink communication scenarios based on their specific requirements. For example, V2V communications may require different overhead than V2I communications, and the system adjusts overhead locally to match each scenario's needs rather than using a uniform overhead approach.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A communication device, which may be otherwise known as user equipment (UE) may support direct communications with other communications devices (e.g., direct communications between multiple UEs). Direct communications may include, but are not limited to, device-to-device (D2D) communications, vehicle-based communications, which may also be referred to as vehicle-to-everything (V2X) communications, vehicle-to-vehicle (V2V) communications, and the like. In an example of V2X communications, V2V communications, and the like, a UE may identify sidelink information for sidelink communications, encode the sidelink information for the sidelink communications based on a transport block size (TBS), determine the TBS for the sidelink information based on an overhead size of a second physical sidelink channel for communicating the sidelink information, and transmit the sidelink information on a physical sidelink channel.