Handover Access Method Selection in LTE Mobile Systems
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Solution Overview
Problem
Current LTE specifications lack flexibility in handover access procedures, with options limited to standard contention-based RACH or non-contention based UL-SCH, failing to adapt to varying application requirements such as delay and quality of service needs.
Innovation Solution
Allowing the network to indicate the access method for the mobile device during handover by signaling information, such as a single bit in the handover command, enabling selection between contention-based RACH and non-contention based UL-SCH access methods based on specific requirements like quality of service and DRX intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If standard contention-based RACH or non-contention based UL-SCH access methods are used in current LTE specifications, then handover procedures are standardized, but flexibility to adapt to varying application requirements such as delay and quality of service needs is limited
Solution Approach 1:
The patent applies dynamics by making the access method selectable rather than fixed. The network can dynamically choose between contention-based RACH and non-contention based UL-SCH access methods based on real-time conditions such as QoS requirements, delay sensitivity, and network load, allowing the handover procedure to adapt to varying application requirements without increasing fundamental system complexity
Solution Approach 2:
The patent changes the parameter of access method selection from a fixed standard to a variable choice. By introducing the capability to select between different access methods (RACH vs UL-SCH) based on parameters like delay requirements and QoS class, the system gains flexibility while maintaining standardized procedures through controlled parameter variation
2Ease of operation
If contention-based RACH method is used for handover access, then access procedure is standardized and simple, but delay uncertainty and collision risks increase
Solution Approach 1:
The patent introduces an intermediary selection mechanism that chooses between contention-based RACH and non-contention based UL-SCH access methods. This intermediary (the access method selector) mediates between the simplicity of standardized procedures and the reliability needs of specific applications, allowing the system to pick the appropriate access method based on QoS requirements and network conditions
3Reliability
If non-contention based UL-SCH access method is used for handover, then delay uncertainty and collision risks are reduced, but flexibility to handle different application requirements is limited
Solution Approach 1:
The patent makes the access method dynamic rather than fixed. The network can switch between non-contention based UL-SCH (for reliability) and contention-based RACH (for simplicity or other scenarios) based on real-time requirements, allowing the system to adapt to different application needs while maintaining high reliability when UL-SCH is selected
Data Source
AI summary
A method of managing a handover of a connection of a mobile device between a first access node and a second access node in a communications system, the method comprising: sending information from the communications system to the mobile device; selecting one of a plurality of access methods for accessing the second access node based on said information; and accessing the second access node using the selected access method.