Uplink Redundancy Version Assignment for Wireless Latency Reduction
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Solution Overview
Problem
The increasing demand for high data throughput and communication capacity in wireless communication systems, particularly due to the rise of M2M communication and high-density user equipment, poses challenges in efficiently managing limited radio resources, leading to latency and delay issues that affect performance.
Innovation Solution
A method for user equipment (UE) in wireless communication systems that involves receiving resource allocation, determining transmission occasions, and assigning redundancy versions based on a sequence to efficiently perform uplink transmissions, allowing for flexible use of limited radio resources and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple UEs are served in a prescribed resource region, then the communication capacity increases, but the latency and delay increase due to limited radio resources
Solution Approach 1:
The patent segments the uplink transmission process into multiple transmission occasions (N occasions) with different redundancy versions. This segmentation allows the base station to receive and decode data across multiple time instances, improving communication capacity while managing latency through distributed transmissions rather than single-point failures requiring retransmission.
Solution Approach 2:
The patent applies preliminary action by pre-configuring multiple transmission occasions and redundancy version sequences before actual data transmission. The UE is provided with RV sequence information in advance, allowing it to prepare multiple encoded versions of data, enabling the system to handle multiple UEs efficiently without incurring additional latency during the transmission phase.
2Reliability
If redundancy versions are managed traditionally, then transmission reliability is maintained, but resource efficiency decreases and latency increases
Solution Approach 1:
The patent introduces dynamic redundancy version management where the RV sequence can be configured flexibly through higher-layer signaling or pre-agreed patterns. The system dynamically selects and applies appropriate RV sequences based on channel conditions and service requirements, maintaining transmission reliability while optimizing resource efficiency by avoiding unnecessary retransmissions.
Solution Approach 2:
The patent changes the parameter of redundancy version assignment from fixed or simple sequential patterns to configurable sequences with variable lengths and patterns. By allowing the RV sequence length M to differ from the number of transmission occasions N, and by providing flexible RV sequence configuration, the system achieves both reliability and resource efficiency through optimized parameter selection.
Data Source
AI summary
Provided is a user equipment that: receives resource allocation; determines N transmission occasions on the basis of the resource allocation, where N is an integer greater than 1; determines a redundancy version (RV) value for each of the N transmission occasions on the basis of an RV sequence of length M; and transmits uplink in at least one transmission occasion from among the N transmission occasions on the basis of the RV value for the at least one transmission occasion. An RV value for an n-th transmission occasion from among the N transmission occasions is n mod M=K-th RV value, from among values in the RV sequence, where n=1, . . . , N.