Multicast Control Signaling Check Element Positioning
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Solution Overview
Problem
Current LTE systems face inefficiencies in dynamic multicast transmission of control information, leading to increased control signaling overhead due to the need for unicast transmission of control data to multiple users, especially in scenarios with a large number of scheduled users per Transmission Time Interval (TTI).
Innovation Solution
A network node and user device configuration that generates and transmits control information messages with individual check elements for multiple user devices, allowing for dynamic multicast control signaling without requiring each user to know the identities or check elements of other users, thereby reducing blind detection and signaling overhead. The network node determines check element positions and transmits corresponding signals to enable efficient multicast control information delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If unicast transmission is used to send control information to multiple users, then each user can receive their control information reliably, but the control signaling overhead increases significantly
Solution Approach 1:
The patent merges multiple unicast control information messages into a single multicast message by combining multiple Cyclic Redundancy Check (CRC) sequences corresponding to different users into one control information transmission. This allows the network device to send control information to multiple users simultaneously, reducing the total number of transmissions and lowering control signaling overhead while maintaining reliable delivery to each user through their unique CRC sequences.
2Quantity of substance
If dynamic multicast transmission is implemented, then control signaling overhead is reduced, but the system complexity increases due to need for user grouping and check element position management
Solution Approach 1:
The patent segments the control information message by inserting multiple check elements (CRC sequences) at different positions within the same control information transmission. Each check element corresponds to a specific user and is placed at a predetermined position that the user can identify. This segmentation allows users to independently verify their control information without requiring complex user grouping management, thereby reducing system complexity while maintaining dynamic multicast efficiency.
3Productivity
If multiple check elements are included in control information message, then multiple users can be addressed simultaneously, but the message length and processing complexity increase
Solution Approach 1:
The patent applies preliminary action by predetermining the positions of multiple check elements within the control information message before transmission. Each user is pre-configured with knowledge of where their specific check element will be located in the multicast message. This eliminates the need for users to perform exhaustive blind detection across the entire message, thereby reducing processing complexity and effective message length from the users' perspective while maintaining high multicast transmission efficiency.
Data Source
AI summary
A network node and a user device are provided. The network node comprises a processor to determine for each of the plurality of user devices a corresponding check element position of a corresponding check element in a control information message addressed to the user device; a transmitter to transmit a first control signal (CS1) to each of the plurality of user devices, the CS1 indicating the determined corresponding check element position. The user device comprising: a receiver to receive a CS1 indicating a corresponding check element position of a check element associated with the user device in a control information message (M), the control information message (M) comprising control information (d) and at least two check elements, a processor to derive the corresponding check element position of the check element associated with the user device from the CS1.