Synchronization Channel Message and Preamble Structure for Transition Time Gaps
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Solution Overview
Problem
In direct communication between terminals, conventional synchronization channel structures require a transition time gap for switching between transmission and reception, which can lead to data loss in the synchronization channel message part, reduced reliability, and inefficient resource usage due to increased code rates or fixed transition times.
Innovation Solution
A method and apparatus for transmitting and receiving a synchronization channel that includes transmitting the synchronization channel message part followed by the preamble part, with an optional transition time gap inserted at the end of the preamble for switching from transmission to reception or vice versa, allowing for flexible allocation of resources and minimizing data loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed Tx/Rx transition time is inserted in the synchronization channel structure, then the terminal can switch between transmission and reception operations, but the terminal cannot transmit all data of the synchronization channel message part and reliability of the message is deteriorated
Solution Approach 1:
The synchronization channel is divided into two distinct parts: a message part that carries synchronization information and a preamble part that enables transition. This segmentation allows the transition time to be accommodated in the preamble part without affecting the complete transmission of message data, thereby resolving the contradiction between enabling Tx/Rx transition and maintaining message reliability.
Solution Approach 2:
The preamble part is transmitted before the message part, serving as a preliminary action that prepares the receiver for the upcoming message transmission. This preliminary preamble transmission allows the receiver to be properly configured and synchronized before receiving the critical message data, ensuring reliable message transmission while accommodating transition requirements.
2Ease of operation
If a fixed Tx/Rx transition time is inserted in the synchronization channel structure, then the terminal can switch between transmission and reception operations, but resource efficiency is decreased
Solution Approach 1:
The patent introduces a dynamic structure where the preamble part can have variable length depending on the specific transition requirements. This dynamic approach allows the transition time to be precisely adjusted to match actual operational needs rather than using a fixed time slot, thereby improving resource efficiency while maintaining Tx/Rx transition capability.
Solution Approach 2:
The preamble part is designed with specific local characteristics including repetition of time domain preamble sequences and selective fading code, which are optimized for transition purposes. This localized optimization of the preamble part's quality and structure enables efficient transition without compromising the overall resource efficiency of the synchronization channel.
3Quantity of substance
If the code rate of the message part is increased to transmit all data, then all data can be transmitted, but reliability of the message is deteriorated
Solution Approach 1:
By segmenting the synchronization channel into message and preamble parts, the patent eliminates the need to increase the code rate of the message part. The preamble part handles the transition time requirements, allowing the message part to maintain its original code rate and thus preserving message reliability while ensuring complete data transmission.
Data Source
AI summary
In a direct communication between terminals, a terminal transmits a synchronization channel preamble part after transmitting a synchronization channel message part including synchronization information. The terminal receives a dedicated channel including a direct communication packet after transmitting the synchronization channel preamble part. A transition time gap for switching from transmission to reception may be inserted to an end of the synchronization channel preamble part.