Sequence Hopping Pattern Synchronization During Wireless Handover
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Solution Overview
Problem
Current wireless communication systems face challenges in seamlessly updating sequence hopping patterns during handovers between cells, which can disrupt communication quality and efficiency due to differences in hopping patterns between cells.
Innovation Solution
A method and apparatus for updating the sequence hopping pattern of an uplink channel during handover by monitoring neighbor cells' downlink channels, determining measurement information, and synchronizing with the target cell's sequence hopping pattern before receiving a handover command, ensuring seamless transition and efficient communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sequence hopping pattern is changed during handover to match target cell, then communication quality is improved, but handover complexity increases
Solution Approach 1:
The WTRU performs measurements and determines the target cell's sequence hopping pattern before the handover command is received. By preparing the sequence hopping pattern information in advance during the measurement phase, the actual handover execution becomes simpler and faster, resolving the contradiction between improving communication quality through pattern synchronization and reducing handover complexity.
2Productivity
If sequence hopping pattern is updated during handover, then system capacity is improved, but handover time increases
Solution Approach 1:
The measurement information including sequence hopping pattern is collected and prepared before handover is triggered. This preliminary preparation ensures that when handover occurs, the WTRU can quickly switch to the target cell's pattern without time-consuming calculations or negotiations, thus improving system capacity while minimizing handover time.
Solution Approach 2:
The WTRU autonomously determines and applies the target cell's sequence hopping pattern based on measurements it has already performed. This self-service approach eliminates the need for complex signaling exchanges during handover, reducing handover time while maintaining improved system capacity through proper sequence hopping synchronization.
3Productivity
If sequence hopping is enabled for PUCCH transmission, then communication efficiency is improved, but signaling complexity increases
Solution Approach 1:
The sequence hopping mechanism is designed to serve multiple functions: it improves communication efficiency by reducing interference and enhancing signal detection, while the same mechanism also carries the handover synchronization function. By making the sequence hopping pattern universal for both PUCCH transmission and handover coordination, the patent avoids adding separate signaling overhead, thus improving communication efficiency without proportionally increasing signaling complexity.
Data Source
AI summary
A method and apparatus are provided for updating a sequence hopping (SH) pattern of an uplink channel during handover from a current cell having a current SH pattern. A method may include receiving, from a base station associated with current cell, a transmission including information indicating a handover command that instructs the WTRU to handover to a target cell. The handover command may include information indicating a SH enablement indication and a SH parameter. The SH enablement indication may indicate that SH is enabled for a physical uplink control channel (PUCCH) transmission. A PUCCH transmission may be sent to a base station associated with the target cell, and the PUCCH transmission may include symbols derived from a sequence that is based on the SH parameter.