RRC Connection Resume Latency Reduction via Dynamic Processing Time
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Solution Overview
Problem
In LTE networks, the processing time for wireless devices to respond to RRC connection resume messages is fixed, leading to inefficiencies in transitioning from idle to connected mode, as it does not account for variations in reconfiguration complexity, resulting in potential delays.
Innovation Solution
Implementing a method to dynamically set the processing time for RRC connection resume messages based on the complexity of reconfiguration required, allowing for shorter processing times when no complex reconfigurations are needed, by indicating a new timing metric (n+k new subframes) in the RRC connection resume message.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed processing time is used for RRC connection resume messages, then the protocol is simple and easy to implement, but the transition time from idle to connected mode increases due to unnecessary delays in cases with simple reconfiguration
Solution Approach 1:
The patent applies dynamics by making the processing time variable rather than fixed. The base station determines the appropriate processing time (first or second value) based on the reconfiguration complexity, and dynamically indicates this to the wireless device through RRC connection resume messages. This allows the system to adapt the processing time to actual needs, reducing unnecessary delays while maintaining simplicity for common cases.
Solution Approach 2:
The patent changes the parameter of processing time from a static fixed value to a variable that can take different values (first processing time value for complex reconfiguration, second processing time value for simple reconfiguration). This parameter change is indicated to the wireless device through signaling in the RRC connection resume message, allowing optimization of transition time based on actual reconfiguration requirements.
2Loss of time
If a shorter processing time is used for RRC connection resume messages, then the transition time from idle to connected mode is reduced, but the reliability decreases due to insufficient processing time for complex reconfigurations
Solution Approach 1:
The patent uses dynamics to adjust the processing time based on the actual reconfiguration complexity. The base station evaluates whether the reconfiguration is complex or simple and dynamically selects the appropriate processing time value (first or second) to indicate to the wireless device. This ensures that complex reconfigurations receive sufficient processing time while simple reconfigurations benefit from shorter delays, maintaining reliability while optimizing transition time.
Solution Approach 2:
The patent changes the processing time parameter to have multiple possible values instead of a single fixed value. The first processing time value is used for complex reconfigurations to ensure reliability, while the second (shorter) processing time value is used for simple reconfigurations to reduce transition time. The base station signals which value to use based on the actual reconfiguration requirements.
3Loss of time
If the base station determines processing time based on reconfiguration complexity, then the transition time is optimized, but the device complexity increases due to additional signaling and determination procedures
Solution Approach 1:
The patent applies preliminary action by having the base station determine and indicate the processing time value to the wireless device in advance, before the wireless device actually processes the RRC connection resume message. This allows the wireless device to prepare appropriately for the required processing time without needing complex determination logic, optimizing transition time while keeping device complexity manageable.
Solution Approach 2:
The patent uses an intermediary approach where the base station acts as the decision-maker for determining processing time based on reconfiguration complexity. The base station evaluates the complexity and signals the appropriate processing time value to the wireless device through RRC connection resume messages, avoiding the need for complex determination procedures in the wireless device itself.
4Loss of time
If a variable processing time is implemented for RRC connection resume messages, then the transition time from idle to connected mode is optimized, but the protocol complexity increases due to additional timing indication signaling
Solution Approach 1:
The patent applies preliminary action by indicating the processing time value to the wireless device in advance through the RRC connection resume message, before the wireless device needs to process the message. This allows the wireless device to optimize its processing schedule without requiring complex protocol modifications, reducing transition time while minimizing protocol complexity increases.
Solution Approach 2:
The patent makes the RRC connection resume message multi-functional by incorporating both the resume command and the processing time indication in the same message. This universal approach allows the single message to serve multiple purposes: initiating the resume procedure and simultaneously informing the wireless device of the appropriate processing time, optimizing transition time while avoiding the need for separate signaling messages that would increase protocol complexity.
Data Source
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AI summary
Methods and apparatuses are disclosed for setting a processing time for a wireless device, WD, to respond to a radio resource control, RRC, connection resume message are disclosed. According to one aspect, a method in a base station includes determining when short processing time conditions exist in relation to the establishment or reconfiguration of the RRC connection for the WD; when short processing time conditions exist, sending to the WD a message indicating a short processing time; and when short processing time conditions do not exist, sending to the WD a message indicating a legacy processing time.