Wireless Device Motion Specification for Resource Allocation
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Solution Overview
Problem
In wireless communication systems, inter-frequency handoffs during active calls pose a risk of call drops due to the need for devices to switch to different carrier frequencies when moving between coverage areas that do not share the same frequency, complicating resource allocation and increasing the likelihood of communication disruptions.
Innovation Solution
Wireless communication devices (WCDs) provide a motion specification with their connection initiation requests, indicating their movement extent and direction, allowing the Radio Access Network (RAN) to proactively select resources that are also used in neighboring coverage areas, thereby minimizing the need for inter-frequency handoffs and reducing call drop risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the RAN allocates resources without considering neighboring coverage areas, then resource allocation flexibility is improved, but the risk of inter-frequency handoffs and call drops increases
Solution Approach 1:
The RAN performs preliminary assessment of device motion specifications and proactively selects resources that are also used in neighboring coverage areas before handoff occurs. This advance preparation ensures that when devices move between coverage areas, they can continue using the same frequency resources, avoiding inter-frequency handoffs and reducing call drop risks.
Solution Approach 2:
The resource allocation strategy dynamically adapts based on device motion characteristics. The RAN adjusts its resource selection behavior according to the motion specification provided by devices - for moving devices, it prioritizes resources shared with neighboring areas to prevent handoff issues, while for stationary devices, it maintains allocation flexibility.
2Reliability
If the RAN selects resources based on neighboring coverage area implementation, then the need for inter-frequency handoffs is reduced, but resource allocation complexity increases
Solution Approach 1:
The RAN applies different resource allocation strategies to different devices based on their local characteristics - specifically their motion specifications. For devices indicating movement toward neighboring coverage areas, the RAN selectively chooses resources that are also implemented in those neighboring areas, while for stationary devices, it maintains standard allocation procedures. This localized adaptation reduces overall system complexity.
Solution Approach 2:
The RAN changes its resource selection parameters based on the motion specification parameter provided by the device. When motion is detected, the RAN modifies its resource allocation criteria to prioritize frequencies used in neighboring coverage areas. This parameter-based adaptation allows the system to maintain reliability without permanently increasing complexity.
3Duration of action of stationary object
If inter-frequency handoff is performed when moving to a coverage area with different carrier frequency, then communication continuity is maintained, but the risk of call drop increases
Solution Approach 1:
The RAN takes preliminary action to prevent the need for inter-frequency handoff by allocating resources that are also used in neighboring coverage areas. This preemptive measure counteracts the potential harm of frequency switching by ensuring that the device can continue using the same frequency resources even when moving to neighboring coverage areas, thereby eliminating call drop risks associated with inter-frequency handoffs.
Data Source
AI summary
A method and corresponding system is disclosed for enhanced resource allocation in a wireless communication system. According to the method, when an idle wireless device seeks to initiate a call in a given coverage area, the device will provide with its initiation request to the serving radio network a motion specification indicating an extent of movement of the device, based on the device's tracking of its own movement. The network will then use that motion specification provided with the initiation request as a basis to determine whether to select a resource to allocate for the call in the given coverage area based on resource implementation in at least one neighboring coverage area or whether to instead select the resource to allocate without regard to resource allocation in the at least one neighboring coverage area.