Beam-Aware Handover for Multi-Beam Access Systems
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Solution Overview
Problem
Conventional handover techniques in wireless communication systems, particularly for millimeter wave (mmW) transmissions, are inadequate as they often result in handover failures due to delayed execution, where outdated information at the target base station leads to unsuccessful signal handovers.
Innovation Solution
A beam-aware handover procedure is implemented, where the source base station preemptively prepares the target base station by sending a handover request with an indication of whether the handover is delayed, allowing the target base station to allocate appropriate beams and access parameters for the user equipment (UE), reducing the likelihood of handover failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional handover techniques are used for mmW transmissions, then the handover execution is simple, but handover failures occur due to outdated information at the target base station
Solution Approach 1:
The source base station preemptively prepares the target base station by sending a handover request message that includes an indication of whether the handover will be delayed. This preliminary action allows the target base station to allocate appropriate beams and access parameters in advance, ensuring that up-to-date information is available when the handover is executed, thereby resolving the contradiction between handover reliability and handover delay.
2Reliability
If the target base station allocates beams and access parameters in advance, then handover reliability improves, but the complexity of the handover procedure increases
Solution Approach 1:
The target base station performs beam allocation and access parameter configuration in advance by receiving a handover request message from the source base station. This preliminary configuration is included in the handover request acknowledgment message sent to the UE, simplifying the actual handover execution while maintaining high reliability through pre-prepared beam and parameter information.
3Reliability
If the source base station provides delay indication to the target base station, then access information remains up-to-date, but the signaling overhead increases
Solution Approach 1:
The source base station includes a delay indication in the handover request message sent to the target base station. This single-bit indication efficiently communicates whether the handover will be delayed, allowing the target base station to adjust its beam allocation and parameter preparation accordingly, thereby maintaining access information accuracy with minimal signaling overhead.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described for a beam-aware handover procedure for multi-beam access systems. A source base station may determine that a handover request is to be sent to a target base station in preparation for handover of a user equipment (UE) from the source base station to the target base station, and transmit the handover request to the target base station with an indication of whether the handover is to be delayed. Alternatively or in addition to, either the target base station or the source base station may generate and transmit a time expiration indicator. The indication of whether the handover is to be delayed or the time expiration indicator may allow either the target base station or the UE to determine whether access parameters for the UE are valid.