HS-PDSCH Total Received Power Estimation During IUR Handover
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Solution Overview
Problem
During a serving High Speed Downlink Shared Channel (HS-DSCH) cell handover across an Interconnection of Radio Network Controller (IUR) interface, terminals face challenges in accurately estimating the total received power of the high speed physical downlink shared channel, leading to potential call drops due to incorrect channel quality indication values.
Innovation Solution
A method and system where the serving radio network controller requests the drift radio network controller to establish an HS-DSCH pre-configuration in the target serving HS-DSCH cell, obtaining and forwarding the measured power deviation information to the terminal, enabling accurate estimation of the total received power after handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal estimates total received power using the standard formula during handover across IUR interface, then the handover process can be completed, but the channel quality indication value becomes incorrect leading to call drops
Solution Approach 1:
The drift radio network controller pre-calculates and provides the measured power deviation value to the serving radio network controller before the handover is executed. This preliminary action ensures that the terminal receives accurate power deviation information in advance, enabling correct total received power estimation and channel quality indication calculation during the handover process, thus preventing call drops while maintaining handover reliability
Solution Approach 2:
The drift radio network controller acts as an intermediary that holds and transfers the measured power deviation information from the target cell to the serving radio network controller, which then provides it to the terminal. This intermediary mechanism solves the problem where the terminal cannot directly obtain accurate power deviation data during cross-IUR handover, ensuring both handover reliability and measurement precision
2Device complexity
If the measured power deviation is not provided during handover, then the handover procedure is simpler, but the terminal cannot accurately estimate total received power
Solution Approach 1:
The measured power deviation parameter is extracted from the complex handover signaling process and provided as a separate, dedicated configuration value to the terminal. This extraction approach allows the terminal to accurately estimate total received power without significantly increasing overall handover procedure complexity, as the power deviation is provided as a pre-calculated value rather than requiring complex real-time calculations
Data Source
AI summary
A method for calculating total received power of an HS-PDSCH is disclosed in the patent document, comprising: when a terminal performs an HS-DSCH cell handover across an IUR interface, an SRNC requesting a DRNC to establish an HS-DSCH pre-configuration; the DRNC returning information of a measured power deviation of a target serving cell to the SRNC; the SRNC sending said information to the terminal; and after performing the handover to the target serving cell, the terminal using the measured power deviation of the target serving cell to estimate the total received power of the HS-PDSCH in the target serving cell. A system for calculating the total received power of the HS-PDSCH is also disclosed in the patent document, and the system comprises: a first module and second module of a serving radio network controller, a drift radio network controller and a terminal.