Relay Station Ranging Method for Timing Offset Calibration
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Solution Overview
Problem
Current communication systems lack a ranging procedure for systems with a relay station, leading to inefficiencies in synchronization and power calibration, particularly in 4th generation mobile communication systems aiming to increase system capacity and extend cell coverage.
Innovation Solution
A ranging method and apparatus for a communication system with a relay station, where the relay station receives a ranging sequence from a mobile station, adds it to a unique reference sequence, and transmits the combined signal back, allowing the mobile station to estimate and adjust for timing offsets through correlation operations, thereby eliminating the need for control messages and reducing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ranging procedures are used in a communication system with a relay station, then the base station can perform timing offset calibration, but the control overhead increases due to the need for control messages between base station, relay station, and mobile station
Solution Approach 1:
The relay station acts as an intermediary that performs timing offset calibration locally with the mobile station using a unique reference sequence, eliminating the need for control messages between the base station and mobile station. The relay station measures the timing offset based on the received ranging sequence and its own reference sequence, then provides calibration information to the mobile station directly.
Solution Approach 2:
The relay station performs self-service by autonomously measuring the timing offset between the mobile station and itself using its own unique reference sequence, without requiring intervention or control messages from the base station. This allows the relay station to independently calibrate the mobile station's timing offset.
2Productivity
If a relay station is introduced to extend cell coverage and increase system capacity, then more mobile stations can be served, but the system lacks a ranging procedure for synchronization and power calibration
Solution Approach 1:
The relay station performs preliminary timing offset calibration with the mobile station before actual data transmission begins. The mobile station transmits a ranging sequence, the relay station measures the timing offset using its reference sequence, and provides calibration information back to the mobile station, establishing synchronization in advance.
Solution Approach 2:
The ranging procedure is segmented into distinct phases: the mobile station transmits a ranging sequence to the relay station, the relay station independently measures the timing offset using its own reference sequence, and the relay station provides calibration information to the mobile station. This segmentation allows the relay station to handle ranging operations autonomously.
3Measurement precision
If the relay station uses a unique reference sequence for timing offset measurement, then direct ranging calibration is enabled, but the complexity of sequence management increases
Solution Approach 1:
The relay station uses a unique reference sequence that is specific to itself, which the mobile station receives and uses for correlation-based timing offset measurement. This copying approach allows the relay station to maintain its own independent reference sequence while enabling the mobile station to perform accurate timing offset estimation through correlation operations.
Data Source
AI summary
A method for performing ranging by a mobile station in a communication system. The method includes transmitting a ranging sequence to a relay station; receiving an added signal of a reference sequence of the relay station and the ranging sequence, from the relay station; performing a correlation operation on each of the ranging sequence and the reference sequence in the added signal; estimating a time difference between the ranging sequence and the reference sequence depending on the correlation operation; and transmitting the signal to the relay station taking the time difference into account.