Dynamic System Information Transmission on Downlink Shared Channel
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Solution Overview
Problem
In 3GPP LTE wireless communication networks, existing technologies face challenges in efficiently transmitting dynamic system information to user equipment (UE) while maintaining low UE complexity and flexibility in transmission structure.
Innovation Solution
The solution involves transmitting system information in regularly occurring time windows, with specific RNTIs indicating the presence of system information and another RNTI signaling the end of transmission, allowing UEs to stop processing unnecessary subframes and improving power-saving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If system information is transmitted using fixed BCH transport channel with predetermined physical resources, then transmission reliability is improved, but transmission flexibility and adaptability deteriorate
Solution Approach 1:
The patent applies dynamics by enabling the system information transmission to switch between fixed BCH transport channel and flexible DL-SCH transport channel. The network can dynamically select which channel to use based on current network conditions, UE capabilities, and system information requirements, thus achieving both reliability (through BCH) and flexibility (through DL-SCH)
Solution Approach 2:
The patent makes the system information transmission universal by allowing it to be carried on multiple transport channels (BCH and DL-SCH). This multi-functionality enables the same system information to be transmitted through different channels depending on the situation, combining the advantages of both fixed and flexible transmission approaches
2Loss of time
If system information is transmitted in every subframe, then information freshness is improved, but UE processing complexity and energy consumption worsen
Solution Approach 1:
The patent applies periodic action by transmitting system information in regularly occurring time windows rather than in every subframe. The time windows are configured with specific periods, allowing UEs to know when to expect system information and when to stop processing, thus maintaining information freshness while reducing continuous processing requirements
Solution Approach 2:
The patent applies preliminary action by providing advance notification to UEs about the timing of system information transmission through time window configuration. UEs can prepare in advance for upcoming transmission windows and enter low-power states between windows, knowing exactly when to wake up and process information
3Ease of manufacture
If system information transmission uses fixed transport format, then transmission simplicity is improved, but transmission efficiency and adaptability worsen
Solution Approach 1:
The patent applies dynamics to the transport format by allowing the network to dynamically select between BCH format and DL-SCH format based on the amount of system information to be transmitted, channel conditions, and UE capabilities. This enables simple fixed formats when appropriate while achieving high efficiency through adaptive format selection when needed
Data Source
AI summary
In one embodiment, a method of transmitting system information on a downlink shared channel structured as successive subframes includes transmitting system information in regularly occurring time windows, each time window spanning some number of successive subframes. The method further includes indicating to receiving user equipment 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.