Relay UE SSB Transmission for Out-of-Coverage Sidelink Connectivity
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Solution Overview
Problem
Conventional wireless communication networks are unable to establish a relay connection with out-of-coverage (OOC) sidelink user equipment (UE) due to the lack of signal or weak signal coverage, limiting network extension and control over OOC UEs.
Innovation Solution
A method and apparatus for a relay UE to receive parameters associated with a relay synchronization signal block (SSB) from a network node, transmit the SSB to OOC sidelink UEs, and facilitate connection requests, enabling the network node to control OOC UEs by forwarding connection requests and parameters, thereby extending coverage and coordinating frequency domain resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional wireless communication networks use direct connection methods, then network control and management are simplified, but coverage area is limited and OOC UEs cannot be connected
Solution Approach 1:
The patent introduces a relay UE as an intermediary node between the network node and OOC SL UE. The relay UE receives configuration messages from the network node, transmits relay SSB signals to OOC UEs, and forwards connection requests bidirectionally, enabling indirect communication paths that extend network coverage to areas where direct connection is not possible.
2Area of stationary object
If relay connections are established for OOC UEs, then network coverage is extended, but signal strength and reliability deteriorate due to additional transmission hops
Solution Approach 1:
The relay UE autonomously performs signal processing and message forwarding operations without requiring continuous network control. It independently transmits relay SSB signals, processes connection requests from OOC UEs, and manages the relay connection establishment, reducing the burden on the network node and improving response reliability in OOC scenarios.
Data Source
AI summary
A method for wireless communication at a relay user equipment (UE) includes receiving, from a network node, a first message indicating one or more parameters associated with a relay synchronization signal block (SSB). The method also includes receiving, from the network node, a second message instructing the relay UE to transmit the relay SSB in accordance with the one or more parameters. The method further includes transmitting, to one or more out-of-coverage (OOC) sidelink (SL) UEs via an SL channel, a third message including the relay SSB in accordance with receiving the second message.