Random Access Preamble Transmission Power Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, particularly in LTE networks with dual connectivity, user equipment (UE) faces challenges in performing multiple random access procedures simultaneously due to power constraints, as the combined transmission power for multiple random access procedures exceeds the UE's maximum transmission power, preventing concurrent execution of random access procedures.
Innovation Solution
The method involves determining the power headroom available for transmission and allowing parallel random access procedures by transmitting only one random access preamble at a specific time if both overlapping transmissions exceed the UE's maximum power, ensuring that only one preamble is transmitted at a time to avoid power overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs multiple random access procedures simultaneously in dual connectivity, then the service availability and system capacity are improved, but the transmission power requirement exceeds the UE's maximum transmission power
Solution Approach 1:
The patent implements dynamic adjustment of random access procedure execution based on real-time power headroom conditions. The UE dynamically determines whether to perform parallel or sequential random access procedures by evaluating its current transmission power capacity against the required power for multiple preambles, allowing the system to adapt between concurrent and sequential operations to resolve the power contradiction
Solution Approach 2:
The patent segments the random access procedures into separate time slots or sequential executions when power constraints prevent simultaneous transmission. By dividing the parallel access attempt into discrete temporal segments, the UE can perform multiple random access procedures to different nodes (MeNB and SeNB) without exceeding maximum transmission power, thus resolving the contradiction between service availability and power consumption
2Reliability
If the UE transmits multiple random access preambles at the same time, then the random access success rate is improved, but the UE's maximum transmission power is exceeded
Solution Approach 1:
The patent applies partial action by selectively transmitting only one random access preamble at a time when power headroom is insufficient for multiple transmissions. Instead of attempting full parallel transmission to all target nodes simultaneously, the UE performs partial transmission to the node with higher priority or better channel conditions, adjusting the degree of parallelism based on available power resources to maintain acceptable access success rates without exceeding power limits
Solution Approach 2:
The patent changes the transmission parameter from parallel to sequential random access preamble transmission based on power headroom evaluation. By dynamically switching between parallel and sequential transmission modes, the system adjusts the timing and scheduling parameters of preamble transmission to ensure that the sum of required transmission powers does not exceed the UE's maximum power capability, thus resolving the contradiction between access success rate and power consumption
3Power
If the UE performs sequential random access procedures, then the transmission power limit is maintained, but the time duration for random access increases
Solution Approach 1:
The patent implements dynamic scheduling of random access procedures that adapts the sequence and timing of preamble transmissions based on power headroom conditions and network priorities. By dynamically determining the optimal execution order and timing intervals between sequential procedures, the system minimizes the total time duration while ensuring power constraints are met, resolving the contradiction between maintaining power limits and reducing access time
Data Source
AI summary
A method and apparatus for performing a random access procedure in a wireless communication system is provided. A user equipment (UE) determines whether transmission of a first random access (RA) preamble to a first node and transmission of a second RA preamble to a second node overlap each other at a specific time duration. If it is determined that the transmission of the first RA preamble and the transmission of the second RA preamble overlap each other, the UE determines whether both the transmission of the first RA preamble and the transmission of the second RA preamble are available at the specific time duration based on an uplink power. If not available, the UE transmits the first RA preamble only at the specific time duration.