Redundancy Version Signaling for BCCH Transmission Efficiency
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Solution Overview
Problem
Current acknowledgement signaling schemes in radio communication systems are inefficient, leading to unnecessary consumption of network resources, particularly in systems like 3GPP LTE, where determining redundancy versions for BCCH transmissions is challenging due to flexible retransmission scheduling and unequal probability of RV occurrence.
Innovation Solution
The implementation of a method to implicitly assign redundancy version sequences by detecting the start of a system information message transmission window and allocating them to non-multicast and remaining subframes, ensuring optimal RV sequences and equal probability of occurrence, thereby optimizing network resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If implicit redundancy version assignment is used in BCCH transmissions, then network resource consumption is reduced, but determining optimal RV sequences becomes more challenging due to flexible retransmission scheduling
Solution Approach 1:
The patent applies preliminary action by pre-defining RV sequence patterns (e.g., patterns 0-7 with specific RV sequences like 0,2,3,1 or 2,3,1,0) that can be directly assigned to BCCH transmissions. These predefined patterns are established in advance and stored in the system, allowing the network to simply select and assign an appropriate pattern based on transmission conditions without performing complex real-time RV sequence determination. This resolves the contradiction by reducing network resource consumption through implicit signaling while maintaining manageable system complexity through pre-computed sequences.
Solution Approach 2:
The patent employs parameter changes by introducing a pattern index parameter that identifies different predefined RV sequences. Instead of transmitting full RV sequences, the system transmits compact pattern indices (0-7) that map to specific RV sequences. This parameter transformation allows efficient implicit signaling with reduced network resource consumption while the receiver can reconstruct the complete RV sequence using the received pattern index and stored mapping tables, thus resolving the complexity issue.
2Speed
If redundancy version sequences are assigned at the start of transmission window, then acquisition speed is improved, but unequal probability of RV occurrence may occur without proper allocation
Solution Approach 1:
The patent applies local quality by differentiating RV sequence allocation based on subframe types. Specifically, different RV sequences are assigned to different local contexts: non-multicast subframes receive one set of RV sequences while multicast subframes receive another set. This localized differentiation ensures that each subframe type gets optimally suited RV sequences for its specific requirements, achieving both fast acquisition (through immediate RV assignment at window start) and equal occurrence probability (through balanced distribution across different subframe types).
Solution Approach 2:
The patent uses preliminary action by pre-planning and pre-assigning RV sequences to different subframe types before actual transmission begins. The system预先 determines which RV sequences will be used in non-multicast versus multicast subframes within the transmission window, ensuring proper probability distribution is established in advance. This prevents unequal RV occurrence and maintains reliability while enabling fast acquisition through immediate RV availability at the start of the transmission window.
3Reliability
If explicit acknowledgement signaling is used, then transmission reliability is improved, but network resources are unnecessarily consumed
Solution Approach 1:
The patent applies self-service by enabling the receiver to autonomously determine the correct RV sequence using the transmitted pattern index and its own stored mapping tables. Instead of requiring explicit acknowledgement signaling from the receiver to confirm successful RV interpretation, the system is designed so that the receiver can independently reconstruct the RV sequence from the downlink transmission parameters and received pattern index. This eliminates unnecessary uplink acknowledgement traffic, reducing network resource consumption while maintaining transmission reliability through the self-determining mechanism.
Solution Approach 2:
The patent introduces an intermediary element: the pattern index. Rather than direct explicit acknowledgement between transmitter and receiver, the pattern index serves as an intermediary that carries the essential RV sequence information in a compressed form. The receiver uses this intermediary pattern index along with pre-stored mapping tables to derive the complete RV sequence, eliminating the need for separate acknowledgement messages while ensuring reliable RV interpretation. This intermediary mechanism reduces network resource consumption while preserving transmission reliability.
Data Source
AI summary
An approach is provided for efficient signaling of redundancy version information. A redundancy version signaling module detects the start of a system information radio transmission window and assigns a redundancy version sequence at the start of the transmission window.