System Information Update for Wireless Terminals
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Solution Overview
Problem
In communications systems, particularly in LTE and future wireless systems, terminals face challenges in updating system information in a timely manner due to differences in system information transmitted by various transmission reception points (TRPs) within a cell or hyper cell, leading to potential excessive transmit power issues and reduced network access success rates.
Innovation Solution
A method and apparatus that involve receiving indication information from a network device about whether system information is consistent across TRPs, allowing terminals to determine if system updates are necessary, and updating system information accordingly, especially when moving between different TRP locations or grouping areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different TRPs transmit different system information, then the system information can be optimized for each TRP's local conditions, but terminals cannot update system information in a timely manner
Solution Approach 1:
The patent segments the hyper cell into multiple TRPs, each capable of transmitting different system information optimized for local conditions. The segmentation is further refined by introducing grouping areas within TRPs, allowing fine-grained control over which terminals receive which system information versions.
Solution Approach 2:
The patent implements feedback mechanisms where terminals report their current TRP identification and grouping area information to the network. The network uses this feedback to determine whether to update system information and notifies terminals of updates through indication information, creating a closed-loop system that ensures timely updates.
2Device complexity
If a single PCI is used for the entire cell or hyper cell, then device complexity is reduced, but terminals cannot distinguish between different TRPs and thus cannot update system information timely
Solution Approach 1:
The patent applies local quality by allowing different TRPs or grouping areas within the same hyper cell to have different system information parameters (such as maximum transmit power, access control parameters) while maintaining the same PCI at the cell level. This enables local optimization without increasing overall system complexity.
Solution Approach 2:
The patent introduces grouping area identifiers as an intermediary layer between the cell-level PCI and TRP-specific parameters. This intermediary allows terminals to distinguish between different service areas within a hyper cell without requiring multiple PCIs, thus maintaining simplicity while enabling reliable system information updates.
3Use of energy by moving object
If terminals use cached system information, then power consumption is reduced, but transmit power settings may become excessive or incorrect
Solution Approach 1:
The patent implements preliminary action by having terminals proactively check for system information updates before initiating network access procedures. The network sends indication information in advance to notify terminals of system information changes, allowing terminals to update their cached information before it would otherwise become invalid, thus avoiding excessive power transmission.
Solution Approach 2:
The patent enables terminals to self-manage their system information caching and update processes. Terminals autonomously determine whether to update system information based on received indication information and their current TRP identification, reducing the need for network-controlled updates while ensuring power settings remain appropriate.
Data Source
AI summary
A system information update method and apparatus are provided. The method includes: receiving, by a terminal, indication information and an area identifier from a first network device, where the indication information indicates whether system information of the area is the same; and determining, by the terminal based on the indication information and/or the area identifier, whether to update the system information.