FDD Uplink Subframe Allocation for Wireless Backhaul
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Solution Overview
Problem
Deploying wired backhaul links for cell sites is costly and inefficient, especially in areas with complex geography, and existing bandwidth allocation methods do not effectively utilize resources for wireless backhaul links, increasing communication system costs.
Innovation Solution
A method and device for a base station to allocate backhaul link resources by selecting and allocating subframes in the uplink frequency band of an FDD wireless communication system, allowing for the use of idle resources as wireless backhaul links, either as uplink or downlink resources, thereby optimizing existing bandwidth usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wired backhaul links are deployed for cell sites, then communication reliability is improved, but deployment cost increases significantly
Solution Approach 1:
The patent replaces wired backhaul links (mechanical/physical connection) with wireless backhaul links (electromagnetic wave transmission). This substitution eliminates the need for physical cable deployment in complicated geographic environments, significantly reducing deployment costs while maintaining communication reliability between macro base stations and repeater base stations.
2Adaptability or versatility
If new bandwidth resources are allocated for wireless backhaul links, then wireless backhaul capability is improved, but communication system cost increases
Solution Approach 1:
The patent makes existing uplink frequency band resources serve dual purposes: originally for uplink communication between user equipment and base stations, and simultaneously for wireless backhaul transmission between macro base stations and repeater base stations. This multi-functionality eliminates the need for dedicated new bandwidth resources, reducing communication system costs while improving wireless backhaul capability.
Solution Approach 2:
The patent enables the existing uplink frequency band to serve itself by allowing wireless backhaul transmissions to utilize the same resources already allocated for uplink communication. The system self-provides the necessary bandwidth resources for backhaul links without requiring external allocation of new spectrum, thereby reducing system costs.
3Productivity
If uplink frequency band resources are used for wireless backhaul links, then resource utilization efficiency is improved, but uplink access link performance may be affected
Solution Approach 1:
The patent segments the uplink frequency band resources by introducing orthogonal cover codes (OCC) to differentiate between uplink access signals and backhaul link signals. This segmentation allows simultaneous operation of both functions on the same frequency resources without mutual interference, maintaining uplink access link performance while improving overall resource utilization efficiency.
Solution Approach 2:
The patent introduces orthogonal cover codes (OCC) as an intermediary mechanism to separate and identify different signal types (uplink access vs. backhaul) transmitted on the same frequency resources. This intermediary enables the system to manage shared resources effectively, ensuring that uplink access link performance is maintained while allowing wireless backhaul transmissions to utilize the same band.
Data Source
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AI summary
Embodiments of the present invention provide a method and a device for allocating a backhaul link resource. The method includes: selecting, by a first base station, at least one subframe in an uplink (UL) frequency band in a frequency division duplex (FDD) wireless communication system; and allocating the selected at least one subframe as a backhaul link resource between the first base station and a second base station. With the method, the device and the system for allocating a backhaul link resource according to the embodiments of the present invention, a subframe is selected in an unexhausted frequency band in existing bandwidth resources and allocated to a wireless backhaul link. Therefore, the existing bandwidth resources are released, resources are allocated to wireless backhaul links, and costs of the communication system are saved.