HFDD Picocell Base Station Frame Synchronization
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Solution Overview
Problem
Half duplex frequency division duplex (HFDD) wireless networks experience a loss of communication capacity and throughput due to the inability to provide bi-directional communication simultaneously, limiting the efficiency of wireless communication systems as they require alternating transmission and reception on different frequencies.
Innovation Solution
Deploying picocell base stations with opposite frame synchronization to master base stations, allowing simultaneous transmission and reception using the same frequencies out of phase, which reduces interference and enables self-backhauling without requiring separate channels for picocell communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If HFDD mode is used to simplify base station design and reduce simultaneous transmission requirements, then device complexity is reduced, but communication capacity and throughput are halved due to inability to provide bi-directional communication simultaneously
Solution Approach 1:
The system segments the network into master base stations and picocell base stations with different frame synchronization patterns. Master base stations use one synchronization pattern while picocell base stations use the opposite pattern, allowing spatial and temporal segmentation of transmission resources. This enables simultaneous full-duplex communication at different locations while maintaining simplified HFDD design at each individual base station.
Solution Approach 2:
The invention adds a spatial dimension to the HFDD system by deploying picocell base stations with opposite frame synchronization patterns in different coverage areas. This allows the system to achieve full-duplex capacity across the network by utilizing both uplink and downlink frequencies simultaneously at different spatial locations, rather than being limited to half-duplex at each individual base station.
2Quantity of substance
If picocell base stations use the same frequencies as master base stations, then frequency resources are efficiently utilized, but interference occurs between simultaneous transmissions
Solution Approach 1:
The system employs periodic frame synchronization patterns where master base stations and picocell base stations alternate their transmission and reception phases. When master base stations are in transmission phase, picocell base stations are in reception phase, and vice versa. This periodic alternation allows picocell base stations to use the same frequencies without causing interference, as transmissions are time-division multiplexed across the network.
3Object-affected harmful factors
If separate channels are allocated for picocell communications, then interference is avoided, but communication capacity is reduced due to dedicated channel requirements
Solution Approach 1:
The invention merges the communication channels of master base stations and picocell base stations by using the same frequencies for both. Through opposite frame synchronization patterns, the system combines the uplink and downlink capacities of both base station types into a unified resource pool, effectively doubling the available communication capacity compared to allocating separate dedicated channels to picocells.
Data Source
Figure 1~2
Figure 3~4
AI summary
A wireless communication system may include a first base station having a first communication coverage area and operating in an HFDD mode using a first frequency and a second frequency in an alternating pattern. The system may also include a second base station having a second communication coverage area different than the first communication coverage area and also operating in an HFDD mode. The second base station may communicate using the first frequency and the second frequency in an opposite alternating pattern from the first base station.