Multi-band Relay Subframe Configuration for Interference Reduction
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Solution Overview
Problem
Conventional multi-hop relay cellular networks face challenges in efficiently managing radio interface resources across multiple links, particularly in fluctuating traffic distributions and varying call volumes, which hinders flexible network reconfiguration and efficient service provision.
Innovation Solution
The solution involves configuring subframes for different links in a multi-hop relay cellular network using at least two frequency bands, where a subframe for a BS-RS link is set in one frequency band and subframes for BS-MS or RS-MS links are configured in another frequency band, allowing for simultaneous communication without intra-cell interference and facilitating flexible resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single frequency band is used for all links in a multi-hop relay cellular network, then device complexity is reduced, but intra-cell interference occurs between BS-RS and RS-MS links
Solution Approach 1:
The patent divides the frequency spectrum into at least two separate frequency bands: a first frequency band for BS-RS links and a second frequency band for RS-MS links. This segmentation eliminates intra-cell interference by ensuring that simultaneous transmissions on different links operate on non-overlapping frequencies, directly resolving the contradiction between simplicity and interference avoidance.
Solution Approach 2:
The patent introduces a frequency dimension separation by allocating different frequency bands to different link types. Instead of managing interference in the time or spatial domain, the solution moves to the frequency domain, creating orthogonal channels that eliminate interference while maintaining relatively simple device operation.
2Object-generated harmful factors
If frequency bands are separated for different links, then intra-cell interference is eliminated, but device complexity increases due to multi-band configuration
Solution Approach 1:
The patent designs the relay station to handle multiple frequency bands using a unified multi-hop relay architecture. The same relay station infrastructure processes both BS-RS communications in the first frequency band and RS-MS communications in the second frequency band, achieving interference elimination without proportionally increasing device complexity through shared hardware resources.
3Device complexity
If conventional single-frequency configuration is used, then device complexity is low, but network flexibility is reduced in fluctuating traffic distributions
Solution Approach 1:
The patent enables dynamic network reconfiguration by allowing the multi-hop relay system to flexibly allocate and reconfigure frequency band resources in response to fluctuating traffic distributions and changing call volumes. The system can adaptively adjust which relay stations are activated and how frequency bands are assigned, providing network flexibility while maintaining manageable device complexity through standardized multi-band protocols.
Data Source
AI summary
An apparatus and a method for supporting multiple links in a multi-hop relay cellular network using at least two frequency bands are provided. A subframe for a link on which a Mobile Station (MS) or a Relay Station (RS) communicates with a Base Station (BS) is configured in a first frequency band, and a subframe for a link on which the BS or the RS communicates with the MS is configured in a second frequency band.