Transparent Container for Reliable Inter-RAT Handover
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Solution Overview
Problem
The existing procedures for inter-RAT handover in wireless telecommunications, such as from UTRAN to GERAN, are unreliable due to the optional nature of the RIM/NACC procedure, which may not guarantee timely delivery of mandatory PSI/SI blocks necessary for packet switched handover.
Innovation Solution
Incorporating PSI/SI blocks into a transparent container from the target base station subsystem to the source base station subsystem, with an optional PSI/SI indicator to determine if these blocks are required, ensuring their timely delivery and avoiding unnecessary transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the RIM/NACC procedure is used to transfer PSI/SI blocks, then the procedure can be implemented, but the delivery is unreliable because the procedure is optional in the network
Solution Approach 1:
The patent applies preliminary action by transferring the PSI/SI blocks from the target BSS to the source BSS before the handover is actually executed. This is done through the target_to_source_BSS transparent container, which carries the system information blocks in advance during the handover preparation phase, ensuring they are available when needed without relying on optional RIM/NACC procedures.
Solution Approach 2:
The patent uses the target_to_source_BSS transparent container as an intermediary mechanism to transfer PSI/SI blocks. This container acts as a mediator that carries the mandatory system information between network elements, bypassing the unreliable optional RIM/NACC procedure and ensuring direct, reliable delivery of the required blocks.
2Reliability
If PSI/SI blocks are always transferred in transparent container, then delivery is guaranteed, but unnecessary data transfer occurs when blocks are not required
Solution Approach 1:
The patent applies dynamics by making the transfer of PSI/SI blocks conditional rather than static. The source BSS only requests and receives PSI/SI blocks in the transparent container when they are actually needed, based on the specific handover scenario. This dynamic approach ensures reliable delivery when required while avoiding unnecessary data transfer when the blocks are already available or not needed.
3Productivity
If RIM/NACC procedure is used, then some optimization can be achieved, but the procedure may not provide PSI/SI blocks in time for handover
Solution Approach 1:
The patent applies preliminary action by ensuring PSI/SI blocks are transferred in advance through the transparent container during handover preparation, rather than relying on the timing of optional RIM/NACC procedures. This guarantees the blocks are available before handover execution, eliminating delays.
Solution Approach 2:
The patent uses the target_to_source_BSS transparent container as a dedicated intermediary channel for PSI/SI block transfer, which operates independently and reliably without being subject to the optional nature or timing constraints of the RIM/NACC procedure, ensuring timely delivery.
Data Source
AI summary
Providing an indication whether a source radio network controller requests to receive system information from a handover target. Receiving the system information in a target to source transparent container, if the indication requests to receive the system information, and not receiving the system information in the target to source transparent container without the indication requesting to receive system information.