Implicit Resource Allocation via Shifted Synchronization Sequences
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Solution Overview
Problem
In unlicensed shared band communication systems, ensuring effective asynchronous and contention-based access with dynamic and scalable spectrum allocation is challenging due to unpredictable interference and lack of guaranteed quality of service, particularly in scenarios where communication devices lack a common timing reference.
Innovation Solution
The method involves transmitting a first synchronization signal with a first cyclic shift over a shared band to synchronize communication devices, and mapping a second cyclic shift to resources of channels, with a second synchronization signal indicating the resources used for data transmission, allowing for simultaneous synchronization and resource allocation without an explicit control channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a common timing reference is used for synchronization, then synchronization accuracy is improved, but device complexity and system coordination requirements increase
Solution Approach 1:
Each communication device independently determines timing information by detecting cyclic shifts in synchronization signals from other devices, without requiring a central timing reference or complex inter-device coordination mechanisms. The device self-synchronizes by measuring time offsets between received and transmitted synchronization signals.
2Productivity
If cyclic shifts are mapped to channel resources, then resource allocation efficiency is improved, but signal detection complexity increases
Solution Approach 1:
Different cyclic shifts of the synchronization signal correspond to different channel resources, creating a mapping relationship similar to color coding. The receiving device determines which channel resource was allocated by detecting which cyclic shift variant is present in the received signal, enabling resource identification through signal characteristic detection.
3Adaptability or versatility
If multiple synchronization signals with different cyclic shifts are transmitted, then resource allocation capability is improved, but interference in unlicensed bands increases
Solution Approach 1:
The synchronization signal is segmented into multiple cyclic shift variants, each representing different channel resource allocations. By transmitting different cyclic shift versions rather than multiple full synchronization signals, the system achieves resource allocation capability while reducing overall signal power and interference in the unlicensed band environment.
Data Source
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AI summary
A method, apparatus, system, and computer readable medium are provided that can utilize one or more synchronization signals to perform synchronization and resource allocation. The one or more synchronization signals can be used for synchronization, as well as include a cyclic shift that maps one or more resources for transmission.