DeNB-RN Mode Switching Synchronization in LTE Relay Networks
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Solution Overview
Problem
In the LTE-Advance system, there are risks of communication failure when a relay node (RN) switches from FDD to H-FDD mode due to potential misalignment in switching times between the RN and the DeNB, leading to incorrect reception and transmission of resource allocation messages, which can result in network access issues.
Innovation Solution
The method involves the DeNB sending an RN reconfiguration message in FDD mode to initiate the switch to H-FDD mode, with the RN sending an acknowledgment message to verify the switch, ensuring both entities synchronize their mode changes correctly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the RN switches to H-FDD mode before receiving the scheduling message from DeNB, then the RN can operate in H-FDD mode, but the RN cannot receive downlink resource allocation information in the PDCCH channel and may miss the scheduling message
Solution Approach 1:
The DeNB sends the scheduling message for the RN_RECFG_CMP message before the RN completes its mode switching to H-FDD. This preliminary action ensures the scheduling message is already available in the PDCCH channel when the RN finishes switching and can immediately receive it, avoiding the problem of missing the message due to timing misalignment.
Solution Approach 2:
The RN sends an acknowledgment message to the DeNB indicating when it has completed the mode switching to H-FDD. The DeNB uses this feedback to ensure the scheduling message is sent at the appropriate time, after the RN is ready to receive it in H-FDD mode, thus coordinating the timing between DeNB and RN.
2Adaptability or versatility
If the DeNB and RN switch modes at different times, then each can configure its own parameters independently, but communication failure occurs due to misalignment in receiving and transmitting messages
Solution Approach 1:
The RN provides feedback to the DeNB about its mode switching status by sending an acknowledgment message when it completes the switch to H-FDD mode. This feedback mechanism allows the DeNB to synchronize its message transmission timing with the RN's readiness, ensuring communication reliability while maintaining independent configuration capabilities.
Solution Approach 2:
The DeNB sends the scheduling message in advance before the RN completes mode switching. This preliminary action, combined with the feedback mechanism, ensures that the scheduling message is ready and properly timed when the RN becomes operational in H-FDD mode, preventing communication failures.
Data Source
AI summary
The present invention provides a method for switching a working mode on a relay network, a base station, a relay node, and a communications system. A donor eNB (DeNB) sends an RN reconfiguration message to a relay node RN in frequency division duplex FDD mode, so that the RN switches from the FDD mode to a half-duplex frequency division duplex H-FDD mode. The DeNB receives an acknowledgment message sent by the RN in FDD mode. When the DeNB verifies, according to the RN reconfiguration message and the acknowledgement message, that the RN has already started to switch from the FDD mode to the H-FDD mode, the DeNB switches from the FDD mode to the H-FDD mode.