Node B Downlink Inner Loop Power Control Mode Confirmation
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Solution Overview
Problem
The existing downlink inner loop power control mode configuration for Node B in Idle and CELL_FACH states is inconsistent with the Transmit Power Control (TPC) bit mode fed back by User Equipment (UE), leading to incorrect F-DPCH transmit power adjustments, potentially causing link failure or power wastage and interference.
Innovation Solution
A method and device for Node B to detect UE in Idle or CELL_FACH states and confirm the downlink inner loop power control mode as mode 0 for F-DPCH, synchronizing with TPC bit information, by storing and managing E-DCH configuration information through physical shared channel reconfiguration messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the RNC configures nonzero mode for DPC MODE, then the Node B will receive TPC bit information according to the configured mode to perform inner loop power control, but the UE constantly adopts MODE 0 to send TPC bit information, resulting in inconsistency between the F-DPCH transmit power adjustment and the expected value
Solution Approach 1:
The patent applies preliminary action by having the Node B pre-configure the downlink inner loop power control mode (DPC MODE) before the UE sends TPC bit information. The Node B stores the configured DPC MODE value and uses it to determine how to interpret incoming TPC bits, ensuring that the power control algorithm is ready and consistent before actual power control operations begin.
Solution Approach 2:
The patent implements feedback by having the UE send TPC bit information back to the Node B, and the Node B using the pre-configured DPC MODE to correctly interpret these feedback bits. The feedback mechanism ensures that the UE's power control requests are processed according to the agreed-upon mode, resolving the inconsistency between configured mode and actual operation mode.
2Power
If the F-DPCH transmit power is adjusted based on inconsistent power control modes, then the Node B may adjust power according to its configured mode, but the UE expects a different adjustment, resulting in power being adjusted to be too small causing link failure or too large wasting power resources and increasing interference
Solution Approach 1:
The patent applies parameter changes by modifying the DPC MODE parameter to ensure consistency between the Node B's configured mode and the UE's operation mode. By changing or confirming the DPC MODE parameter value before power control operations, the system ensures that the F-DPCH transmit power is adjusted according to the correct algorithm, preventing both link failure and power wastage.
3Ease of operation
If the Node B uses a configured nonzero DPC MODE, then the inner loop power control algorithm operates according to that mode, but the UE operates in MODE 0, causing the F-DPCH transmit power to deviate from expected values
Solution Approach 1:
The patent applies preliminary action by having the Node B pre-configure and store the DPC MODE value before the UE sends TPC bit information. This preliminary configuration ensures that when the UE operates in MODE 0 and sends TPC bits, the Node B is already prepared with the correct interpretation mode, eliminating the mismatch between configuration and operation.
Solution Approach 2:
The patent implements feedback by using the UE's TPC bit transmissions as a trigger to confirm or adjust the DPC MODE setting. The feedback loop ensures that the Node B's power control mode matches the UE's operation mode, improving the accuracy of TPC bit interpretation and preventing power control deviations.
Data Source
AI summary
The invention provides a method and a device for confirming a downlink inner loop power control mode by a Node B in an idle mode and in a CELL_FACH state. The method includes that: when the Node B detects that there is User Equipment (UE) using an E-DCH in the idle mode or in the CELL_FACH state, confirming to use a mode 0 to receive Transmit Power Control (TPC) bit information sent on a Dedicated Physical Control Channel (DPCCH) by the UE, and performing downlink inner loop power control on a Fractional Dedicated Physical Channel (F-DPCH). The method and device provided in the invention enable the inner loop power control mode for the F-DPCH made by the Node B to be consistent with the TPC bit information mode fed back by the UE, and enable the F-DPCH to use proper transmit power to transmit.