HSPA LTE Coexistence via Spectrum Transition Band Allocation
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Solution Overview
Problem
Existing communication systems face challenges in efficiently coexisting in the same frequency band due to significant latency and conservative frequency management, which is unacceptable for systems with short Transmission Time Intervals (TTI) like HSPA and LTE, and prior art solutions introduce interference and high costs by requiring separate frequency bands and equipment.
Innovation Solution
The method involves using spread spectrum and multi-carrier transmission techniques, specifically CDMA and OFDMA/SC-FDMA, to allow HSPA and LTE systems to coexist in the same frequency band by exploiting transition bands and synchronizing scheduling operations, reducing interference and equipment duplication through a multi-system joint scheduler and shared sampling frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HSPA and LTE systems operate in separate frequency bands, then interference between systems is minimized, but spectrum efficiency decreases and deployment costs increase
Solution Approach 1:
The patent combines HSPA and LTE systems into a single frequency band by merging their transmission mechanisms. The base station integrates both CDMA-based HSPA and OFDMA-based LTE transmissions, allowing simultaneous operation on the same frequency resources without requiring separate licensed bands for each system.
Solution Approach 2:
The base station is designed with multi-functionality to support both HSPA and LTE protocols simultaneously. A single base station infrastructure performs dual roles: managing CDMA channels for HSPA users and OFDMA resources for LTE users, eliminating the need for separate dedicated equipment for each system.
2Productivity
If HSPA and LTE systems share the same frequency band, then spectral efficiency improves, but cross-interference between systems increases
Solution Approach 1:
The patent segments the frequency band into distinct resource allocations for HSPA and LTE systems. By dividing the available spectrum resources and time slots between the two systems, it enables simultaneous operation while minimizing mutual interference through structured resource partitioning.
Solution Approach 2:
The base station acts as an intermediary that coordinates transmissions between HSPA and LTE systems. It manages the shared frequency band by scheduling and controlling both CDMA and OFDMA transmissions, resolving potential conflicts and minimizing cross-interference through centralized resource management.
3Reliability
If separate base stations are deployed for HSPA and LTE, then system compatibility is ensured, but deployment costs and device complexity increase
Solution Approach 1:
The patent merges HSPA and LTE functionalities into a single base station platform. The base station integrates both CDMA and OFDMA transmission capabilities, allowing one piece of equipment to serve dual purposes and eliminating the need for separate base station deployments for each system.
Solution Approach 2:
The base station is designed as a universal platform that can handle both HSPA and LTE protocols simultaneously. It performs multiple functions including CDMA channel management, OFDMA resource allocation, and coordinated scheduling for both systems, reducing overall device complexity and deployment costs.
Data Source
AI summary
Digital signals are transmitted over a communication channel having a given bandwidth, by simultaneously transmitting: one or more Spread Spectrum signals, such as, Code Division Multiple Access signals, wherein the spectrum of the Spread Spectrum signals exhibits roll-off transition bands at the boundaries of the spectrum, and one or more multi-carrier transmission signals, such as, Orthogonal Frequency Division Multiplexing signals, which are transmitted over the transition bands of the Spread Spectrum signals.