Wireless Relay State Transitions for Reliable Cell Reselection
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Solution Overview
Problem
The introduction of L2 relay in wireless communication systems leads to contradictions in existing cell selection and re-selection methods, particularly in non-RRC-connected states, necessitating a more accurate and robust mechanism for mobility management.
Innovation Solution
A method and device for wireless communications that includes entering a first state in response to specific conditions, performing operations via a relay, and transitioning to a second state or cell selection state based on condition sets, ensuring seamless integration of relay selection and re-selection with cell re-selection, especially in scenarios involving L2 relay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If L2 relay is introduced to enable remote UEs to access the network, then network coverage and accessibility are improved, but contradictions arise in existing cell selection and re-selection methods
Solution Approach 1:
The patent introduces a relay node as an intermediary between the remote UE and the network. The relay node receives system messages from the network and forwards them to the remote UE, enabling the remote UE to access the network indirectly. This mediator resolves the contradiction by allowing network coverage extension while maintaining reliable cell selection through the relay's connection to the network.
Solution Approach 2:
The patent segments the cell selection process into two independent parts: cell selection for the relay node (which maintains direct network connection) and cell selection for the remote UE (which connects through the relay). This segmentation allows each part to operate independently according to its own conditions, resolving the contradiction between extended coverage and selection reliability.
2Adaptability or versatility
If remote UEs perform cell selection outside coverage area, then accessibility is improved, but system complexity increases due to additional condition sets and state transitions
Solution Approach 1:
The patent makes the relay node serve multiple functions simultaneously: it acts as both a regular UE performing cell selection and as a relay providing network access to remote UEs. The relay node uses the same cell selection mechanisms for both its own connection and for enabling remote UEs, reducing overall system complexity while improving accessibility.
3Ease of manufacture
If existing cell selection methods are used with L2 relay, then implementation simplicity is maintained, but measurement accuracy and selection reliability deteriorate
Solution Approach 1:
The patent applies different cell selection criteria and measurement methods to different locations in the system: the relay node performs cell selection based on direct network signal quality, while remote UEs perform cell selection based on relay signal quality. This local differentiation ensures accurate measurements and reliable selection for each component without complicating the overall implementation.
Data Source
AI summary
A method and a device for wireless communications. A first node enters a first state in response to any condition in a first condition set being satisfied, and performs a first operation set in the first state. The first node moves from the first state to a second state in response to any condition in a second condition set being satisfied. The first node moves from the first state to any cell-selection state in response to any condition in a third condition set being satisfied. By receiving a first message and a first signal, the first node can determine the state in a rational way.