Grant-Free Resource Allocation for MTC Cell Transition
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Solution Overview
Problem
The existing scheduling request mechanism for uplink data transmission in MTC services causes significant signaling overheads and transmission latency, especially when user equipment moves from one cell to another, leading to inefficient resource reconfiguration and increased energy consumption.
Innovation Solution
Implementing a grant-free resource allocation method where user equipment can perform grant-free communication without requesting resource reconfiguration when moving to a neighboring cell with the same grant-free resource area ID, reducing the need for signaling overheads and latency by maintaining the pre-configured UE ID and resource configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the network device reconfigures grant-free resources when UE moves to a neighboring cell, then the resource allocation adapts to the new cell, but signaling overhead increases and transmission latency increases
Solution Approach 1:
The network device pre-configures grant-free resources and associated RNTIs for multiple cells before the UE actually moves to those cells. When the UE performs cell reselection to a pre-configured cell, it can immediately use the pre-configured grant-free resources without waiting for network reconfiguration, thus reducing transmission latency while maintaining adaptability through pre-planned resource allocation.
Solution Approach 2:
The patent implements a dynamic mechanism where the UE autonomously determines whether to use pre-configured grant-free resources based on cell reselection events. The system transitions from static network-controlled reconfiguration to dynamic UE-autonomous resource selection, reducing signaling overhead while adapting to mobility patterns.
2Adaptability or versatility
If the network device reconfigures grant-free resources when UE moves to a neighboring cell, then the resource allocation adapts to the new cell, but signaling overhead increases
Solution Approach 1:
The network device sends pre-configuration information including grant-free resources and RNTIs for multiple cells in advance. When the UE reselects to a pre-configured cell, no additional signaling is needed as the resources are already allocated. This eliminates the need for real-time signaling exchanges during cell transitions, significantly reducing signaling overhead.
Solution Approach 2:
The UE autonomously selects and uses pre-configured grant-free resources when reselecting to a pre-configured cell without needing to request or receive new resource allocation from the network. This self-service approach eliminates signaling overhead for resource reconfiguration while maintaining adaptability through the pre-configured resource pool.
3Adaptability or versatility
If the network device reconfigures grant-free resources when UE moves to a neighboring cell, then the resource allocation adapts to the new cell, but energy consumption increases
Solution Approach 1:
The network device provides pre-configuration information including grant-free resources and RNTIs for multiple cells before the UE needs them. This eliminates the need for energy-consuming signaling exchanges and processing during cell transitions, as the UE can directly use the pre-configured resources without additional network interactions.
Solution Approach 2:
The UE independently utilizes pre-configured grant-free resources during cell reselection without requiring network coordination. This self-service mechanism avoids the energy consumption associated with signaling transmission, reception, and processing that would occur with traditional network-controlled reconfiguration.
4Adaptability or versatility
If the network device reconfigures grant-free resources when UE moves to a neighboring cell, then the resource allocation adapts to the new cell, but device complexity increases
Solution Approach 1:
The network device performs the complex task of configuring grant-free resources for multiple cells in advance through a single signaling operation. This front-loads the complexity management to the network side, allowing the UE to simply select from pre-configured options during cell reselection without needing complex real-time resource management capabilities.
Data Source
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AI summary
Embodiments of this application provide a grant-free resource allocation method, used by user equipment to perform grant-free communication based on a first UE ID corresponding to a first cell, without resending a resource reconfiguration request to a second network device for resource reconfiguration. Therefore, signaling overheads are reduced, and a communication latency is reduced. The method in the embodiments of this application includes: when user equipment moves from a first cell to a second cell, obtaining, by the user equipment, an ID that is of a second grant-free resource area to which the second cell belongs and is broadcast by a second network device; and if the ID of the second grant-free resource area is the same as a preobtained ID of a first grant-free resource area to which the first cell belongs, performing, by the user equipment, grant-free communication based on a first UE ID corresponding to the first cell.