Redcap SIB Transmission via Initial BWP Status Selection
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Solution Overview
Problem
Existing wireless communication technologies, such as MTC and NB-IoT in LTE, struggle to meet the high transmission rate and low latency requirements of IoT services like video monitoring and industrial sensing, necessitating the development of Redcap UE in 5G NR, but there is a need to avoid unnecessary system information updates and reduce power overhead in configuring SIBs for these devices.
Innovation Solution
A method and apparatus that determine the status of the initial bandwidth part (BWP) of Redcap UE to selectively send either a general-purpose SIB or an exclusive SIB, avoiding unnecessary updates and reducing power consumption by configuring the appropriate SIB based on the BWP status, including configurations for shared and independent BWPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a new SIB exclusive to Redcap UE is configured, then system information completeness for Redcap UE is improved, but system information update overhead and power consumption increase
Solution Approach 1:
The patent applies universality by making the initial BWP serve multiple functions: it acts as both the default BWP for Redcap UE and carries system information that can serve both general-purpose UEs and Redcap UEs. By configuring the initial BWP with appropriate subcarrier spacing and cyclic prefix parameters, it becomes a multi-functional resource that supports different UE types without requiring separate dedicated resources, thereby reducing overall system information overhead and power consumption.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting the initial BWP configuration parameters (subcarrier spacing, cyclic prefix length, bandwidth) based on the UE type and service requirements. This allows the system to optimize the initial BWP for different scenarios - using smaller subcarrier spacing for coverage-enhanced services and larger spacing for low-latency services - thereby achieving reliable system information delivery while minimizing resource overhead and power consumption.
2Loss of time
If frequent system information updates are performed, then system information freshness is improved, but network overhead and power consumption increase
Solution Approach 1:
The patent implements periodic action by establishing a scheduled update mechanism for system information in the initial BWP. Instead of continuous or frequent updates, the system information is updated at optimized intervals based on the configured periodicity, which reduces unnecessary transmissions while maintaining adequate freshness. This periodic update approach allows Redcap UEs to enter sleep modes between updates, significantly reducing power consumption while still receiving timely system information when needed.
3Reliability
If initial BWP is configured with small subcarrier spacing, then coverage enhancement is improved, but latency increases
Solution Approach 1:
The patent applies dynamics by making the initial BWP configuration flexible and adaptable rather than fixed. The base station can dynamically adjust the subcarrier spacing and cyclic prefix parameters of the initial BWP based on real-time channel conditions, UE capabilities, and service requirements. This dynamic configuration allows the system to switch between coverage-enhanced settings (small subcarrier spacing with extended cyclic prefix) and low-latency settings (larger subcarrier spacing with normal cyclic prefix), optimizing performance for different operational scenarios.
4Loss of time
If initial BWP is configured with large subcarrier spacing, then latency is reduced, but coverage enhancement deteriorates
Solution Approach 1:
The patent utilizes parameter changes by systematically varying the initial BWP parameters (subcarrier spacing, cyclic prefix length, bandwidth) based on the specific service requirements and channel conditions. When low latency is the priority, the system configures larger subcarrier spacing with normal cyclic prefix. When coverage enhancement is needed, it switches to smaller subcarrier spacing with extended cyclic prefix. This parameter adaptation mechanism ensures that the initial BWP configuration is always optimized for the current operational context, resolving the trade-off between latency and coverage enhancement.
Data Source
AI summary
An information transmission method is performed by a base station, and includes: obtaining a status of an initial bandwidth part (BWP) of a reduced capability (Redcap) user equipment (UE); and sending at least one of a first system information block (SIB) or a second SIB according to the status of the initial BWP, wherein the first SIB is an SIB that is able to be read by a current general-purpose UE, and the second SIB is an SIB exclusive to the Redcap UE.