Coordinated Multi-Point Handover Control Channel Reliability
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Solution Overview
Problem
Current CoMP techniques in wireless communication networks only address data channel radio link failures and do not mitigate control channel radio link failures during inter-base station or cell handovers, leading to service interruptions and potential call drops due to radio link failures.
Innovation Solution
Implementing a CoMP system that allows user equipment (UE) to receive control channels and handover commands from multiple base stations or cells, or from a base station with high DL radio link quality, enhancing control channel reliability through joint processing and exclusive CoMP set Cell Radio Network Temporary Identifiers (C-RNTI) for improved handover procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CoMP techniques are used to improve data channel transmission, then data rate and signal quality are improved, but control channel reliability during handover remains insufficient
Solution Approach 1:
The patent segments the CoMP system into distinct functional components: a set of coordinating base stations (first set) that transmit control channels, and a set of base stations (second set) that may be different from the first set. This segmentation allows independent optimization of control channel reliability from data channel transmission, resolving the contradiction by applying CoMP selectively to control channels while maintaining data channel performance.
Solution Approach 2:
The patent makes the CoMP mechanism universal by enabling it to serve both control channels and data channels. The same coordinated multi-point transmission framework is applied to ensure reliable handover commands are delivered, while also maintaining high data rates. This multi-functionality approach improves control channel reliability without requiring a completely separate system.
2Reliability
If multiple base stations transmit control channels jointly, then handover reliability is improved, but the complexity of coordinating transmission increases
Solution Approach 1:
The patent applies preliminary action by having base stations prepare and transmit handover commands in advance during the handover process. The coordinating base stations transmit control channels containing handover commands before the actual handover execution, ensuring the UE receives necessary instructions timely. This preliminary transmission of control information improves handover reliability while the coordination framework manages complexity through structured preparation.
Solution Approach 2:
The patent incorporates feedback mechanisms where the UE sends measurement reports to base stations, and base stations adjust their transmission strategies based on channel conditions and handover status. This feedback loop enables dynamic adaptation of control channel transmission parameters, improving reliability while managing coordination complexity through continuous optimization based on actual system state.
Data Source
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AI summary
A system and method for implementing call handover (HO) is disclosed. A user equipment (UE) is configured to communicate with a wireless communication network. The UE is configured to transmit a measurement report to at least one of a serving cell and at least one cell of a coordinated multi-point (CoMP) cell set. The UE is also configured to listen for control channel transmissions from at least one of the serving cell and a first cell in the CoMP cell set, receive a resource allocation from at least one of the serving cell and the first cell in the CoMP cell set, and receive an HO command jointly from the serving cell and the first cell in the CoMP cell set. The HO command identifies a target cell. The UE is also configured to perform handover to the target cell identified in the HO command.