Uplink Reference Signal Power Control for Fast 5G Handover
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in fast and efficient user equipment (UE) handover between base stations, particularly in 5G New Radio (NR) systems, due to delayed signal synchronization and inefficient power allocation during handover procedures, which can lead to increased latency and disrupted data transmission, especially in mission-critical applications.
Innovation Solution
The method involves configuring UE to transmit multiple uplink reference signals at different power levels, allowing target base stations to select an optimal reference signal and transmit power correction parameters, enabling seamless handover without iterative power ramping and reducing random access procedure iterations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If iterative power ramping is used during random access procedure for handover, then successful reception and decoding at target base station is achieved, but handover latency increases and data transmission is disrupted
Solution Approach 1:
The patent applies preliminary action by having the UE transmit multiple uplink reference signals at different power levels before the handover is finalized. The target base station measures these signals in advance and determines the optimal power level, so that when the handover executes, the UE can immediately use the predetermined power level without iterative ramping, thus reducing handover latency while ensuring reliable reception.
2Reliability
If multiple random access message repetitions are transmitted during handover, then synchronization with target base station is achieved, but channel resources are inefficiently allocated
Solution Approach 1:
The patent performs preliminary measurement and power level determination by having the target base station measure multiple uplink reference signals transmitted at different power levels before the actual handover. This advance preparation allows the system to identify the optimal power level in one shot, eliminating the need for multiple random access message repetitions and thereby improving channel resource allocation efficiency while maintaining synchronization reliability.
3Reliability
If uplink transmit power is iteratively incremented during handover, then signal reception quality is improved, but power consumption increases
Solution Approach 1:
The patent applies preliminary action by having the UE transmit multiple uplink reference signals at different power levels before handover, allowing the target base station to measure and determine the optimal power level in advance. This way, the UE can directly use the determined optimal power level during the actual handover without iterative power incrementing, reducing unnecessary power consumption while ensuring adequate signal reception quality.
4Reliability
If traditional random access procedure with power ramping is used for handover, then connection reconfiguration is achieved, but user experience and system throughput are degraded
Solution Approach 1:
The patent implements preliminary action by having the target base station measure multiple uplink reference signals transmitted at different power levels before the handover is executed. This advance measurement and determination of the optimal power level enables the handover to proceed smoothly without iterative power ramping, thereby maintaining connection reconfiguration reliability while improving system throughput and user experience through reduced latency.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
This disclosure provides systems, methods, and apparatus for wireless communications that support fast user equipment (UE) handover between base stations. A UE may receive, from a source base station, a configuration for reference signal transmission at a set of uplink transmit power levels. The UE may transmit multiple uplink reference signal repetitions based on the configuration. The source base station may transmit a request message to a target base station to measure the multiple uplink reference signal repetitions. The target base station may select an uplink reference signal and measure a transmit power correction. The target base station may transmit an indication to the source base station of the selection and transmit power correction. The source base station may evaluate the indications and select the target base station. The source base station may forward to the indicated contents, and the UE may switch and synchronize with the target base station.