FDD TDD Terminal Network Entry via Duplex Capability Signaling
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Solution Overview
Problem
Wireless communication devices designed for multi-network operation face challenges in entering networks that use different duplex modes, such as frequency-division duplex (FDD) and time-division duplex (TDD), due to incompatibilities in carrier frequencies and modes of operation.
Innovation Solution
A method and system that facilitate entry by using defined carrier frequencies for join request messages, where the messages include duplex capability information, allowing the communication network to respond appropriately and enable the terminal's entry into the network, regardless of the duplex mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a terminal is designed for single-network operation with preprogrammed signaling parameters, then entry into the network is straightforward, but the device cannot operate in multiple network types
Solution Approach 1:
The terminal is designed with universal signaling capabilities that can adapt to both FDD and TDD networks. The device includes multiple signaling parameter sets and can dynamically select appropriate parameters based on the target network type, enabling a single device to operate across multiple network types without requiring separate pre-programmed configurations for each network.
Solution Approach 2:
The terminal employs dynamic parameter selection where signaling parameters are not fixed but can be changed based on the detected network type. The device dynamically adjusts its signaling behavior during the network entry process, transitioning between different parameter sets to match the requirements of FDD or TDD networks as identified through detection mechanisms.
2Adaptability or versatility
If a terminal is designed for multi-network operation, then adaptability to different networks is improved, but determining appropriate signaling parameters becomes complex
Solution Approach 1:
The terminal pre-stores multiple sets of signaling parameters corresponding to different network types (FDD and TDD) in its memory. Before attempting to join a network, the device has these parameter sets ready and can quickly select the appropriate set based on network type detection, avoiding the need for complex real-time parameter calculation or negotiation during the network entry process.
Solution Approach 2:
The invention introduces an intermediary detection mechanism that identifies the target network type before the terminal commits to using specific signaling parameters. This intermediary step acts as a mediator between the terminal's multiple parameter sets and the actual network connection, selecting the appropriate parameter set based on detected network characteristics and facilitating seamless adaptation without complex determination logic.
3Device complexity
If a network operates in a specific duplex mode (FDD or TDD), then system design is simplified, but terminals of incompatible duplex modes cannot enter the network
Solution Approach 1:
The terminal changes its operating parameters dynamically based on the detected network duplex mode. When joining an FDD network, the terminal configures itself to use frequency-division duplex parameters; when joining a TDD network, it switches to time-division duplex parameters. This parameter adaptation allows the same terminal hardware to operate in networks with different duplex modes without requiring separate hardware designs for each mode.
Data Source
AI summary
Entry of a terminal into a wireless communications network is facilitated for terminals which may operate in either frequency-division duplex or time-division duplex mode. Join request messages transmitted by the terminals include a duplex capability indicator defining a carrier frequency which can be used to response to the terminals.