Relay Station Synchronization Channel Generation Using Masked XOR Sequences
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Solution Overview
Problem
In multi-hop relay wireless communication systems, achieving synchronous operation and configuring a Synchronization Channel (SCH) for relay stations is challenging due to differences in frame timings between base stations and mobile stations, making handover and synchronization difficult.
Innovation Solution
A method and apparatus for generating an SCH for relay stations by XOR-operating a sequence of the SCH for mobile stations with a mask sequence, allowing for synchronization acquisition and improving Peak-to-Average Power Ratio (PAPR) performance, which involves storing SCH sequences and using a common mask to create distinct SCHs for relay stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multi-hop relay scheme is adopted to enable flexible wireless network configuration and improve service efficiency, then network adaptability and coverage are improved, but synchronization and handover between base stations and relay stations become difficult due to frame timing differences
Solution Approach 1:
The patent divides the synchronization channel into two distinct types: BS-SCH for base station to mobile station communication and RS-SCH for base station to relay station communication. This segmentation allows each synchronization channel to be optimized independently, with RS-SCH using a masked sequence derived from BS-SCH to ensure proper synchronization while distinguishing relay station operations from mobile station operations.
Solution Approach 2:
The patent introduces a mask sequence as an intermediary element that transforms the BS-SCH sequence into the RS-SCH sequence. This mask acts as a mediator that preserves the synchronization properties of the original sequence while adapting it for relay station use, enabling reliable synchronization in multi-hop relay networks without compromising the flexibility benefits of the relay architecture.
2Measurement precision
If separate synchronization channels are configured for base stations and relay stations, then synchronization accuracy is improved, but system complexity increases due to additional channel configuration and management
Solution Approach 1:
The patent creates the RS-SCH by copying and transforming the BS-SCH sequence through XOR operation with a mask sequence. Instead of designing a completely independent synchronization channel for relay stations, the system replicates the proven BS-SCH structure and adapts it through a simple mathematical transformation, reducing the complexity of configuring and managing separate synchronization channels while maintaining distinct functionality.
3Device complexity
If relay stations use the same SCH sequence as mobile stations, then device complexity is reduced, but synchronization accuracy deteriorates due to frame timing differences between direct and relay links
Solution Approach 1:
The patent changes a key parameter of the synchronization sequence by applying a mask through XOR operation. This parameter change transforms the BS-SCH sequence into the RS-SCH sequence, allowing relay stations to maintain simplified sequence generation based on the same base sequence as mobile stations, while achieving accurate synchronization specific to relay link timing characteristics.
Data Source
AI summary
An apparatus and method for generating an RS SCH in a wireless communication system are provided, in which a base station checks a BS SCH sequence and a mask sequence, and generates an RS SCH sequence by XOR-operating the BS SCH sequence and the mask sequence.