Handover Signaling for Reduced-Capability UE Identification
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Solution Overview
Problem
Legacy network devices incorrectly determine the capabilities of reduced capability UE, leading to improper bandwidth allocation and operational failures for these devices.
Innovation Solution
Incorporating identifier information and indication mechanisms in handover requests and system messages to differentiate between reduced capability UE and legacy UE, preventing handovers and camp-ons to non-supporting network devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a legacy network device uses the current protocol to determine UE capabilities, then the network device can operate with existing bandwidth allocation rules, but it incorrectly determines the capability of reduced capability UE by assuming they support 100 MHz bandwidth
Solution Approach 1:
The patent applies preliminary action by having the UE proactively indicate its reduced capability type before the network device performs bandwidth allocation. The UE includes a first indication information field in its uplink transmission, which allows the network device to identify the UE type in advance and avoid incorrect capability determination. This prevents the reliability issue of assuming 100 MHz support while maintaining protocol simplicity.
2Ease of operation
If the network device allocates bandwidth based on the assumption that all UEs support 100 MHz, then the allocation process is simplified, but reduced capability UE receive incorrect bandwidth allocation and cannot work normally
Solution Approach 1:
The patent applies local quality by introducing a specific indication field (first indication information) that applies only to reduced capability UEs. The network device checks this field locally to determine whether the UE requires special bandwidth allocation. This allows the network to maintain simple default allocation for regular UEs while providing correct specialized allocation for reduced capability UEs, resolving the contradiction between allocation simplicity and correctness.
3Quantity of substance
If reduced capability UE transmit only the 10-bit bitmap without additional indication information, then the uplink transmission overhead is minimized, but the network device cannot distinguish between reduced capability UE and legacy UE
Solution Approach 1:
The patent applies partial action by adding only the minimal necessary indication information (first indication information field) to the uplink transmission. This additional field provides just enough information for the network device to distinguish UE types without significantly increasing overhead. The solution avoids excessive action by not requiring complete capability re-reporting, thus balancing information completeness with transmission efficiency.
Data Source
AI summary
Embodiments of this application provide a communication method and a device. The communication method and the device may be used in the field of a communication technology that supports a reduced capability terminal device, for example, weak-capability UE or MTC UE. The method includes: A first network device determines that a type of a first terminal device is a first type. The first network device sends a handover request message. The handover request message includes first indication information. The first indication information includes identifier information of the first type. The first network device receives a handover acknowledgment message or a handover preparation failure message.