Wireless Handover Delay Reduction via Layer 1 Indication
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Solution Overview
Problem
Current cell handover procedures in wireless communication systems involve significant delays due to the need for measurement reporting and network configuration interactions, which can lead to late handovers, especially in high-speed scenarios.
Innovation Solution
A wireless communication method where a terminal device reports first indication information to the MAC layer, triggering an RRC reconfiguration complete message to the network device, allowing for immediate handover completion and reducing delay by utilizing lower layer signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If measurement reporting and network configuration interaction are used for cell handover, then handover reliability is improved, but handover delay increases
Solution Approach 1:
The patent segments the handover completion indication into two parts: (1) Layer 1/L2 indication information sent immediately after handover execution, and (2) RRC reconfiguration complete message sent later. This segmentation allows the critical delay-sensitive notification to be sent quickly via lower layers, while the detailed confirmation follows separately, thus reducing overall handover delay while maintaining reliability.
Solution Approach 2:
The patent implements preliminary action by having the terminal send Layer 1/L2 indication information immediately upon completing handover execution, before the RRC reconfiguration complete message is prepared and sent. This preliminary notification allows the network to be aware of handover completion earlier, reducing the effective handover delay without sacrificing the formal confirmation process.
2Measurement precision
If measurement reporting interaction is used for cell handover, then handover accuracy is improved, but communication continuity deteriorates
Solution Approach 1:
The patent divides the handover completion notification into immediate Layer 1/L2 indication and subsequent RRC messaging. This segmentation ensures that the critical continuity-maintaining notification is sent instantly, preventing communication interruptions, while the detailed measurement and configuration confirmation follows without affecting the continuity already established.
Solution Approach 2:
By sending the Layer 1/L2 indication information immediately upon handover completion, the patent maintains continuous communication without interruption. The network receives real-time notification of handover completion, allowing it to maintain active communication sessions without waiting for the slower RRC message exchange, thus preserving communication continuity.
3Reliability
If RRC reconfiguration complete message is sent for handover confirmation, then handover reliability is improved, but signaling interaction complexity increases
Solution Approach 1:
The patent segments the confirmation process into two stages: (1) Simple Layer 1/L2 indication sent immediately with minimal processing, and (2) Formal RRC reconfiguration complete message sent later with full configuration details. This segmentation reduces the immediate signaling complexity while maintaining reliable confirmation through the two-stage process.
Solution Approach 2:
The patent uses preliminary action by sending the Layer 1/L2 indication information first, which serves as an immediate confirmation without requiring complex RRC message processing. The full RRC reconfiguration complete message follows as a formal but non-critical confirmation, thereby reducing the overall signaling interaction complexity while maintaining reliability.
Data Source
AI summary
Embodiments of this application provide a wireless communication method, a terminal device, and a network device. The method includes: reporting, by a MAC layer of the terminal device, first indication information to a radio resource control RRC layer of the terminal device, so as to trigger the RRC layer to send an RRC reconfiguration complete message to a network device, where the first indication information is used to indicate that the terminal device has completed a handover of a serving cell; or sending, by a layer 1 or a layer 2 of the terminal device, the first indication information to the network device.