System Information Transmission Windows in LTE Networks
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Solution Overview
Problem
In 3GPP LTE wireless communication networks, the existing methods for transmitting system information are inflexible and inefficient, particularly for dynamic system information, which requires frequent repetition and can interfere with high-priority data transmissions, leading to increased power consumption and complexity for user equipment (UE).
Innovation Solution
The dynamic part of system information is transmitted in regularly occurring time windows with specific RNTIs indicating the presence and end of system information, allowing UEs to stop demodulating and decoding when no more information is expected, and enabling flexible selection of subframes for transmission based on current conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If system information is transmitted frequently to ensure timely acquisition by UEs, then information freshness is improved, but power consumption and complexity of UE increase due to continuous demodulation and decoding
Solution Approach 1:
The patent implements periodic transmission of system information within defined time windows rather than continuous transmission. UEs know when to expect system information and can enter low-power states between windows, reducing power consumption while ensuring timely acquisition at regular intervals.
Solution Approach 2:
The patent uses RNTI indicators in advance to signal the presence and end of system information transmission. UEs can prepare to receive information only when indicated, avoiding continuous processing and reducing power consumption while maintaining timely acquisition capability.
2Loss of information
If system information transmission is repeated frequently to ensure UE acquisition, then information availability is improved, but interference with high-priority data transmissions increases
Solution Approach 1:
The patent segments system information transmission into specific time windows separated from data transmissions. This segmentation allows system information to be transmitted periodically without continuously interfering with high-priority data transmissions, as resources are divided into distinct transmission windows.
Solution Approach 2:
System information is transmitted periodically within defined windows rather than continuously. This periodic approach ensures information availability at regular intervals while minimizing interference with data transmissions that occur in other time slots.
3Ease of manufacture
If fixed transmission format is used for system information, then transmission simplicity is improved, but flexibility in adapting to different conditions deteriorates
Solution Approach 1:
The patent introduces dynamic elements to the transmission structure by allowing flexible selection of subframes within time windows for system information transmission. While the overall window structure provides simplicity, the specific subframe selection can adapt to current network conditions, combining ease of implementation with operational flexibility.
Solution Approach 2:
The transmission structure is segmented into time windows with flexible internal subframe allocation. This segmentation maintains overall structural simplicity while enabling adaptability in how individual subframes are assigned within each window, allowing the system to adjust to different conditions without changing the fundamental transmission framework.
Data Source
AI summary
In one embodiment, a method of transmitting system information on a downlink shared channel structured as successive subframes includes transmitting (400-416) system information in regularly occurring time windows, each time window spanning some number of successive subframes. The method further includes indicating (406/408) to receiving user equipment (120) which subframes within a given time window carry system information. The method and variations of it are applied, for example, to the transmission of dynamic system information on the downlink shared channel or other downlink channel in a 3GPP E-UTRA wireless communication network (100).