Dynamic Message Repetition for Random Access in Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face limitations in efficiently managing message repetitions during random access procedures, particularly in indicating suitable message repetition numbers for initial and retransmitted messages, which can lead to inadequate flexibility in different deployment scenarios and cell conditions.
Innovation Solution
The system receives a system information block (SIB) indicating a selected set of message repetition numbers from a plurality of sets, and a bit field in a random access response (RAR) or downlink control information (DCI) further specifies the message repetition number, allowing for flexible selection based on initial or retransmitted messages, deployment scenarios, and system information parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed message repetition number is used in random access procedures, then the system operation is simplified, but the adaptability to different deployment scenarios and cell conditions deteriorates
Solution Approach 1:
The patent implements dynamic message repetition indication by allowing the base station to selectively indicate different message repetition numbers (K1, K2, K3) based on random access message type (initial or retransmitted), deployment scenario, and cell conditions. This dynamic approach replaces fixed repetition schemes, enabling the system to adapt to varying conditions while maintaining operational simplicity through automated base station control.
Solution Approach 2:
The patent changes the message repetition parameter dynamically by introducing multiple repetition number options (K1 for initial messages, K2/K3 for retransmitted messages) that can be selectively indicated by the base station. This parameter flexibility allows adaptation to different deployment scenarios and cell conditions without complicating the overall system operation, as the base station manages the selection process.
2Loss of information
If message repetition numbers are not differentiated between initial and retransmitted messages, then the signaling overhead is reduced, but the precision of message repetition control deteriorates
Solution Approach 1:
The patent applies different message repetition numbers (K1, K2, K3) to different message types (initial vs. retransmitted) based on local conditions. This local differentiation allows precise control where needed while avoiding unnecessary signaling overhead by only indicating the specific repetition number relevant to each message type, rather than using a universal repetition scheme for all messages.
3Adaptability or versatility
If multiple message repetition numbers are supported, then the versatility for different scenarios is improved, but the device complexity increases
Solution Approach 1:
The patent implements dynamic selection of message repetition numbers (K1, K2, K3) based on message type and conditions, allowing the system to support multiple repetition scenarios without requiring complex device configurations. The base station dynamically indicates the appropriate repetition number, simplifying device complexity while maintaining versatility.
Solution Approach 2:
The patent introduces multiple message repetition parameters (K1, K2, K3) that can be selectively activated based on deployment needs. This parameter-based approach allows the system to support diverse scenarios without increasing device complexity, as the complexity is managed at the base station level through parameter selection rather than device-level configuration.
4Ease of operation
If message repetition is not optimized for retransmitted messages, then the random access procedure is simpler, but the reliability of message delivery deteriorates
Solution Approach 1:
The patent applies different message repetition numbers (K2 or K3) specifically to retransmitted random access messages, providing enhanced reliability where needed while keeping the overall procedure simple. The base station selectively indicates the appropriate repetition number for retransmitted messages based on conditions, optimizing reliability without complicating the general random access procedure.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station, a system information block (SIB) that indicates a selected set of message repetition numbers from a plurality of sets of message repetition numbers. The UE may receive, from the base station, a bit field in a random access response (RAR) or downlink control information (DCI) that indicates a selected message repetition number from the selected set of message repetition numbers indicated in the SIB. The UE may transmit, to the base station, a message during a random access procedure based at least in part on the selected message repetition number. Numerous other aspects are described.