Wireless Terminal Category Control for Fast Frequency Setting
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Solution Overview
Problem
In wireless communications, particularly in systems like W-CDMA and E3G, the conventional method of setting uplink and downlink frequencies requires a large volume of control information, complicating the control process and making high-speed frequency setting challenging due to fixed frequency band assignments.
Innovation Solution
The proposed solution involves a wireless communication system that designates a terminal category based on terminal capability information, allowing for simplified frequency setting by using a control signal that represents the frequency difference between uplink and downlink frequencies, reducing the number of bits required for control information and enabling faster frequency setting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If separate frequency bands are assigned to uplink and downlink with constant frequency difference, then frequency resource management is simplified, but control information volume increases and frequency setting speed decreases
Solution Approach 1:
The patent combines uplink and downlink frequency information into a single control signal by encoding both frequencies and their difference together. Instead of separately signaling uplink frequency (Nu) and downlink frequency (Nd) requiring 28 bits total, the invention encodes them as a unified frequency pair representation that reduces control information volume while maintaining the ability to manage frequency resources efficiently.
Solution Approach 2:
The patent changes the representation parameters of frequency information from separate absolute frequency values to a combined encoding that includes frequency difference. By introducing frequency difference as a parameter in the control signal structure, the system achieves more compact representation that reduces control bits while preserving frequency resource management capabilities.
2Measurement precision
If 14-bit control signals are transmitted for frequency information Nu and Nd, then frequency precision is maintained, but control information volume becomes large
Solution Approach 1:
The patent extracts the frequency difference component from the full frequency information and uses it as a separate parameter in the control signal. By taking out the frequency difference (Nd - Nu) as an explicit parameter, the system can represent both frequencies with fewer bits than transmitting two separate 14-bit values, thereby reducing control information volume while maintaining precision.
Solution Approach 2:
The patent segments frequency information representation into two parts: absolute frequency reference and frequency difference. This segmentation allows the system to transmit only the necessary deviation from a reference frequency rather than full absolute values, reducing the total control information volume from 28 bits to a more compact representation that preserves precision.
Data Source
AI summary
A wireless communication system corresponding to a wireless terminal device in which at least one of a first frequency bandwidth for use in an up link and a second frequency bandwidth for use in a down link is variable, including a capability information reception unit capable of receiving and extracting terminal capability information transmitted from the wireless terminal device and related to capability of the wireless terminal device; a category designation unit capable of designating a terminal category to which the wireless terminal device belongs, based on the terminal capability information received and extracted by the capability information reception unit; and a link setting unit capable of setting a link to the wireless terminal device and transmitting a control signal depending on the link setting to the wireless terminal device, based on the terminal category designated by the category designation unit.