RRC SI Request via MAC CE Contention Resolution
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Solution Overview
Problem
Next-generation wireless communication networks face challenges in efficiently transmitting and receiving System Information (SI) in shared networks, particularly in scenarios where multiple Public Land Mobile Networks (PLMNs) operate the same cell, requiring effective methods for PLMN-specific system information delivery and request procedures.
Innovation Solution
A method for System Information (SI) request and transmission in next-generation wireless networks involves a UE sending a message with a Radio Resource Control (RRC) SI request over a common control channel, receiving a Medium Access Control (MAC) control element with a UE contention resolution identity, and acknowledging the request based on matching bits, allowing for PLMN-specific information to be broadcast or unicast as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If on-demand SI request procedure is implemented, then SI transmission efficiency is improved, but device complexity increases due to additional signaling procedures
Solution Approach 1:
The patent segments the SI request and response procedures into distinct phases with specific MAC CE formats for different scenarios (contention-based and contention-free random access). This segmentation allows the system to handle different SI request scenarios with optimized procedures, improving efficiency while managing complexity through structured segmentation of the signaling process.
Solution Approach 2:
The patent implements preliminary action by pre-configuring SI request configurations including MAC CE formats, contention resolution identities, and random access resources before actual SI requests are made. This preparation reduces the complexity of on-the-fly decision-making and streamlines the actual SI request execution, improving overall transmission efficiency.
2Adaptability or versatility
If PLMN-specific system information is broadcast in shared networks, then network sharing functionality is improved, but information transmission overhead increases
Solution Approach 1:
The patent applies local quality by providing PLMN-specific system information only to UEs that require it, rather than broadcasting all possible PLMN information to all UEs. The network identifies which UEs need which PLMN-specific information and delivers it selectively, reducing overall information overhead while maintaining full network sharing capability.
Solution Approach 2:
The patent implements self-service by enabling UEs to autonomously request the specific PLMN system information they need through on-demand SI request procedures. UEs identify their own information requirements and initiate requests accordingly, reducing unnecessary information transmission while maintaining adaptability to different PLMN configurations.
3Adaptability or versatility
If contention-based random access is used for SI requests, then resource allocation flexibility is improved, but access conflict probability increases
Solution Approach 1:
The patent implements feedback mechanisms through contention resolution procedures where the network responds to SI requests with acknowledgment and conflict resolution information. When multiple UEs contend for the same resources, the network provides feedback to identify successful contenders and manage conflicts, maintaining resource allocation flexibility while improving access reliability through active conflict management.
Solution Approach 2:
The patent applies dynamics by making the random access procedure adaptive based on network conditions and UE requirements. The system can dynamically switch between contention-based and contention-free approaches, adjust contention resolution parameters, and modify resource allocation based on observed conflict patterns, thereby maintaining flexibility while improving access success rates.
Data Source
AI summary
A method for a system information (SI) request procedure performed by a user equipment (UE) is provided. The method includes: receiving a system information block type 1 (SIB1) from a cell; transmitting, to the cell, a first message including a common control channel (CCCH) service data unit (SDU) that includes a radio resource control (RRC) SI request message; receiving, from the cell, a medium access control (MAC) control element (CE) including a UE contention resolution identity; and indicating, by a MAC entity of the UE, reception of an acknowledgment for the RRC SI request message to an RRC entity of the UE after determining that the UE contention resolution identity matches multiple consecutive bits, starting from the most significant bit (MSB), of the CCCH SDU. The SIB1 does not include information related to a Random Access (RA) resource specific to SI requested by the RRC SI request message.