Base Station RRC Message Segmentation for Relay Configuration
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Solution Overview
Problem
Current cellular mobile communication systems lack a clear method for the base station to properly report setting information necessary for establishing a logical path to the relay station, which is essential for effective communication between the base station and the user apparatus.
Innovation Solution
A base station generates and transmits two distinct RRC messages: a first message with common setting information for both the user apparatus and the relay station, and a second message with dedicated setting information specifically for the relay station, including details like priority of the radio bearer, semi-persistent scheduling, sounding reference signal resources, MAC sublayer configuration, and MBSFN subframe information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the base station transmits individual RRC messages with setting information for both user apparatus and relay station, then the setting information can be properly reported to the relay station, but the message structure becomes complex and difficult to manage
Solution Approach 1:
The patent divides the RRC message into two distinct types: first RRC message containing setting information common to both user apparatus and relay station, and second RRC message containing setting information dedicated to the relay station. This segmentation allows the base station to transmit setting information in an organized manner, preventing information loss while managing message structure complexity through clear classification.
Solution Approach 2:
The patent applies different content characteristics to different messages: the first RRC message contains universally applicable setting information (common quality), while the second RRC message contains relay station-specific setting information (local quality). This allows each message to be optimized for its specific purpose, improving information completeness without unnecessarily increasing overall system complexity.
2Reliability
If the base station provides separate setting information for relay station and user apparatus, then the logical path can be properly established, but the configuration process becomes more complex
Solution Approach 1:
The patent segments the configuration process into two sequential steps: first transmitting the first RRC message with common setting information, then transmitting the second RRC message with relay station-specific setting information. This segmentation ensures that the relay station receives and processes setting information in a structured manner, improving the reliability of logical path establishment while making the configuration process more manageable through clear separation of concerns.
Solution Approach 2:
The patent performs preliminary action by first establishing common setting information through the first RRC message before adding relay station-specific information through the second RRC message. This preliminary establishment of common parameters simplifies the subsequent configuration process and ensures a reliable foundation for the logical path before specialized settings are applied.
3Adaptability or versatility
If the relay station uses TDD scheme with MBSFN subframe restriction, then reception from base station and transmission to user apparatus can be realized by half duplex scheme, but the setting information becomes more complex compared to user apparatus
Solution Approach 1:
The patent applies local quality by including MBSFN subframe information and TDD-specific settings only in the second RRC message dedicated to relay station configuration. This allows the relay station to receive its specific half-duplex and MBSFN requirements as part of the relay station-specific settings, while the user apparatus continues to receive simplified settings without these restrictions, thus maintaining adaptability without unnecessarily increasing complexity for all devices.
Data Source
AI summary
A base station generates first setting information commonly used for establishing a logical path for communication with a user apparatus and for establishing a logical path for communication with a relay station, and second setting information used only for establishing the logical path for communication with the relay station, and transmits a second RRC message including the second setting information to the relay station after transmitting a first RRC message including the first setting information to the relay station. The first setting information includes information indicating a priority of a radio bearer in the logical path, information indicating usage of resources in SPS, information indicating resources of SRS, configuration information in a MAC sublayer, and information on change of a security encryption key in handover, and the second setting information includes at least system information and MBSFN information.