UE Capability Signaling for Guard Band Alignment in N28 Access
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Solution Overview
Problem
In wireless communication systems, user equipment may fail to access a network due to a mismatch in guard bandwidths when accessing a channel bandwidth of 40 MHz within a frequency band of N28, leading to RRC reconfiguration failures.
Innovation Solution
User equipment transmits capability information indicating its ability to support both a first guard bandwidth greater than a second guard bandwidth, allowing network devices to adjust resource block configurations to align carrier centers with channel rasters, ensuring successful access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If user equipment determines guard band according to difference value between channel bandwidth and transmission bandwidth, then guard band calculation is simple, but a situation occurs where minimum guard band of 30 MHz CBW is greater than minimum guard band of 40 MHz CBW
Solution Approach 1:
The patent changes the parameter determination logic by introducing capability information exchange between UE and network device. The network device determines the guard band parameter based on UE capability (supporting 30MHz or 40MHz CBW) rather than simple bandwidth difference calculation, ensuring the guard band parameter is appropriately selected to avoid access failures.
2Productivity
If user equipment accesses network bandwidth of 40 MHz in channel bandwidth of 30 MHz within frequency band of N28, then bandwidth utilization is improved, but carrier edge extension exceeds bandwidth lower limit (758 MHz) causing RRC reconfiguration failure
Solution Approach 1:
The patent implements preliminary action by having the UE report capability information (supporting 30MHz or 40MHz CBW) to the network device before actual network access. The network device uses this pre-reported capability to appropriately determine the guard band parameter, preventing RRC reconfiguration failures before they occur.
Solution Approach 2:
The patent establishes a feedback mechanism where UE capability information regarding CBW support is fed back to the network device. This feedback enables the network device to make informed decisions about guard band configuration, ensuring compatibility between UE capabilities and network configuration.
3Device complexity
If user equipment supports only first guard bandwidth for first channel bandwidth, then device complexity is reduced, but adaptability to different channel bandwidth configurations is limited
Solution Approach 1:
The patent implements universality by designing the UE capability information to indicate support for multiple CBW configurations (30MHz or 40MHz). This allows a single UE to adapt to different channel bandwidth scenarios without requiring separate hardware configurations, achieving multi-functionality through software/firmware capability reporting.
Data Source
AI summary
A method for transceiving indication information, where the indication information includes user equipment capability information, the method includes: sending user equipment capability information to a network device by user equipment, where the user equipment capability information is used indicatingto indicate whether to support a first capability, the first capability is an ability of a user equipment-side channel bandwidth to support a first guard bandwidth and also to support a second guard bandwidth, and the first guard bandwidth is greater than the second guard bandwidth.