User Equipment Out of Coverage Autonomous Handover
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Solution Overview
Problem
Wireless communication systems face challenges in ensuring reliable data transmission when user equipment (UE) is out of coverage, leading to failures in receiving and decoding scheduled downlink transmissions, which can result in missed packets and communication interruptions.
Innovation Solution
The implementation of methods and apparatuses that allow UE to perform autonomous handovers or transmit physical uplink control channels (PUCCH) with beam sweeping across multiple slots when out of coverage, based on specific conditions, to maintain communication reliability and avoid interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE remains in coverage area to maintain connection, then communication reliability is maintained, but the UE cannot serve mobile broadband users effectively when moving out of coverage
Solution Approach 1:
The network entity pre-configures the UE with autonomous handover parameters and beam sweeping patterns before the UE goes out of coverage. This preliminary configuration enables the UE to immediately perform handover or beam sweeping when out of coverage without requiring real-time network coordination, thus maintaining communication reliability while supporting mobility.
2Adaptability or versatility
If the UE performs autonomous handover when out of coverage, then mobility is supported, but handover latency increases
Solution Approach 1:
The network entity pre-configures the UE with autonomous handover parameters including target cell information and handover execution conditions before the UE goes out of coverage. This preliminary action eliminates the need for real-time network coordination during handover, significantly reducing handover latency while maintaining mobility support.
3Reliability
If the UE transmits PUCCH with beam sweeping across multiple slots, then downlink transmission reliability is improved, but transmission time increases
Solution Approach 1:
The UE performs beam sweeping across multiple slots only when necessary (i.e., when out of coverage and needing to establish downlink connection). The network entity configures the UE to perform beam sweeping for a limited number of slots based on coverage conditions. This partial action approach improves downlink transmission reliability when needed while avoiding unnecessary time consumption when the UE is already in coverage.
4Reliability
If the network entity monitors for uplink transmissions from UE, then communication reliability is maintained, but network complexity increases
Solution Approach 1:
The UE autonomously performs handover and beam sweeping operations when out of coverage without requiring continuous network monitoring and control. The network entity only needs to pre-configure the UE with necessary parameters and then monitor for uplink transmissions. This self-service approach maintains communication reliability while significantly reducing network entity complexity compared to continuous network-controlled handover procedures.
Data Source
AI summary
Aspects of the present disclosure provide a method for wireless communications by a user equipment (UE). The method generally includes determining a failure to receive and decode at least one scheduled downlink (DL) transmission from a network entity is based, at least in part, on the UE being out of coverage and taking one or more actions, based, at least in part, on one or more conditions. The one or more actions include at least one of: performing an autonomous handover (HO) or transmitting a physical uplink control channel (PUCCH) with beam sweeping across multiple slots.