Restricted Bandwidth Allocation for Reduced-Capability UEs
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently allocating frequency resources for reduced capability devices, which often have lower data throughput and relaxed latency requirements, leading to increased complexity and resource inefficiencies.
Innovation Solution
The proposed solution involves allocating a restricted bandwidth for data signaling to reduced capability user equipment (UEs), configuring them with a subset of bandwidth parts (BWPs) for control and data signaling, and enabling frequency hopping to enhance frequency diversity and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency resources are allocated to reduced capability devices using standard bandwidth allocation methods, then the devices can communicate with the network, but the device complexity and resource allocation inefficiency increase
Solution Approach 1:
The patent applies parameter changes by modifying the bandwidth allocation parameters specifically for reduced capability devices. Instead of using standard full-bandwidth allocation, the system allocates a restricted bandwidth (e.g., 100 resource blocks instead of 275) and configures a subset of bandwidth parts (e.g., 4 out of 10 BWPs) for these devices. This parameter modification resolves the contradiction by improving resource allocation efficiency for reduced capability devices while maintaining manageable system complexity through standardized configuration procedures.
2Device complexity
If a restricted bandwidth is allocated for data signaling to reduced capability UEs, then the complexity and interference are reduced, but the frequency resource flexibility decreases
Solution Approach 1:
The patent implements dynamics by enabling frequency hopping for the restricted bandwidth allocation. The network can dynamically switch the frequency location of the restricted bandwidth across different time slots, allowing the same physical resource blocks to be reused by different devices at different times. This dynamic approach resolves the contradiction by maintaining reduced complexity for each individual device while improving overall frequency resource flexibility and utilization through time-varying allocations.
Solution Approach 2:
The patent applies segmentation by dividing the total bandwidth into multiple bandwidth parts (BWPs) and allocating only a subset of these BWPs to reduced capability devices. For example, out of 10 total BWPs, only 4 are configured for reduced capability devices, and within those, only a restricted portion (e.g., 100 resource blocks) is allocated for data signaling. This segmentation resolves the contradiction by reducing device complexity through limited scope while maintaining system flexibility through the availability of other BWPs for different purposes.
3Reliability
If standard bandwidth parts are configured for control and data signaling, then the control signaling can be transmitted, but the data transmission efficiency for reduced capability devices decreases
Solution Approach 1:
The patent applies segmentation by separating control signaling and data signaling into different frequency resources. Control signaling is transmitted over the full bandwidth parts (BWPs) to ensure reliability, while data signaling for reduced capability devices is allocated a restricted bandwidth within those BWPs. This segmentation allows control signaling to maintain full coverage and reliability while data transmission operates efficiently within the restricted bandwidth appropriate for reduced capability devices' processing capabilities.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit an indication of a capability of the UE to support a restricted bandwidth for data signaling. The UE may receive an indication of a bandwidth part for control signaling and an indication of a set of frequency domain resources for the data signaling. The set of frequency domain resources may correspond to a subset of the bandwidth part in accordance with the restricted bandwidth. The UE may communicate the control signaling over the bandwidth part and data signaling over the set of frequency domain resources. In some cases, the bandwidth restriction may correspond to a bandwidth size for the set of frequency domain resources or a number of resource blocks in the set of frequency domain resources.