Preamble Prioritization Element for RACH Handover Latency
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Solution Overview
Problem
In LTE networks, high load conditions on Random Access Channel (RACH) slots can lead to increased access times and degraded handover performance, as the eNB struggles to prioritize and respond to multiple UE preambles efficiently.
Innovation Solution
The proposed solution involves configuring priority for different preamble groups, allowing the eNB to prioritize dedicated handover preambles over others, ensuring that UEs performing handover receive a RACH response first, even under extreme load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the eNB responds to multiple UE preambles simultaneously under high load conditions, then the system can serve more UEs, but the access time for handover UEs increases and handover performance degrades
Solution Approach 1:
The patent segments the preamble response handling into priority-based groups. The eNB divides the pool of detected preambles into priority groups (e.g., handover preambles with higher priority, random access preambles with lower priority) and processes them in segmented batches according to their priority levels, ensuring handover UEs are served first while still accommodating other UEs under high load conditions
Solution Approach 2:
The patent applies local quality by assigning different response priorities to different preamble groups based on their specific requirements. Handover preambles are assigned high priority quality to ensure fast access, while random access preambles are assigned lower priority quality. This allows the eNB to maintain optimal access time for critical handover operations while still serving other UEs, resolving the contradiction between serving quantity and access time
2Reliability
If the eNB prioritizes dedicated handover preambles over other preambles, then handover performance is maintained, but the number of other UEs that can be served decreases under extreme load
Solution Approach 1:
The patent implements dynamic priority-based preamble response handling. The eNB dynamically adjusts the number of preambles responded to in each priority group based on current load conditions. Under extreme load, the system dynamically allocates more resources to high-priority handover preambles while reducing responses to lower-priority random access preambles, maintaining handover reliability while adapting overall service capacity to current network conditions
3Ease of operation
If the eNB uses random preamble selection by UEs, then the system is simple to operate, but access time becomes unpredictable and handover reliability decreases under high load
Solution Approach 1:
The patent applies preliminary action by pre-configuring priority levels for different preamble groups before the actual random access occurs. The eNB预先 establishes that handover-related preambles belong to high-priority groups while random access preambles belong to lower-priority groups. This preliminary prioritization structure ensures that when high load conditions occur, handover UEs automatically receive preferential treatment, making handover reliability predictable without complicating the overall operation
Data Source
AI summary
A method, computer-readable media and system for providing Random Access Channel (RACH) response preamble prioritization are presented. In one embodiment a method includes receiving, from a RACH receiver at a Preamble Prioritization Element (PPE), a list of detected preambles from a plurality of User Equipment (UE) devices, the preambles having a configured priority for different preamble groups; providing, by the PPE, an ordered prioritized list of the detected preambles; and forwarding, by the PPE to a RACH response element, a predetermined number of detected preambles from the ordered prioritized list.