Discovery Signal Redundancy Version Mapping Across Multiple PRB Pairs
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Solution Overview
Problem
In the context of Device to Device Proximity Service (D2D ProSe) in LTE systems, the existing technology limits each redundancy version (RV) of the discovery signal to be transmitted on only one physical resource block pair (PRB Pair), leading to deteriorated encoding and decoding performance when the coded bits of the discovery signal need to occupy more than one PRB Pair.
Innovation Solution
The proposed solution involves determining a discovery signal and encoding it to obtain initial locations of multiple RVs, which are then separately mapped to at least two physical resource block pairs (PRB Pairs) for transmission, allowing for efficient use of resource locations and reducing the complexity of detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If each redundancy version (RV) of the discovery signal is transmitted on only one physical resource block pair (PRB Pair), then the transmission structure is simple, but the encoding and decoding performance deteriorates when coded bits need to occupy more than one PRB Pair
Solution Approach 1:
The patent segments the transmission of redundancy versions across multiple PRB Pairs. Instead of confining each RV to a single PRB Pair, the system divides the coded bits into multiple segments that can be distributed across multiple PRB Pairs. This segmentation allows the discovery signal to occupy multiple resource blocks while maintaining organized transmission structure, thereby improving encoding and decoding performance without excessive complexity increase.
2Reliability
If multiple redundancy versions are transmitted across multiple PRB Pairs, then encoding and decoding performance improves, but resource allocation complexity increases
Solution Approach 1:
The patent extends the transmission dimension from single PRB Pair to multiple PRB Pairs by introducing a resource block index dimension. The mapping rule incorporates both the PRB Pair index and resource element indices, creating a multi-dimensional resource allocation structure. This dimensional extension allows efficient distribution of multiple RVs across available resources while maintaining systematic allocation patterns that manage complexity.
Solution Approach 2:
The patent changes the parameter of resource allocation from fixed one-to-one mapping to a flexible many-to-many mapping relationship. By introducing parameters such as the number of PRB Pairs (M), the number of RVs (K), and the mapping rule parameters (q, r), the system can adapt resource allocation to different discovery signal sizes and channel conditions, improving performance while managing complexity through parameterized control.
3Ease of manufacture
If all coded bits of the discovery signal are confined to one PRB Pair, then resource allocation is simple, but the area coverage and detection reliability are insufficient
Solution Approach 1:
The patent merges multiple PRB Pairs into a unified transmission resource pool for carrying the discovery signal. By combining multiple resource blocks and allowing the discovery signal to span across them, the system increases the total area coverage and improves detection reliability. The merging is achieved through a unified mapping rule that treats multiple PRB Pairs as an extended resource space while maintaining systematic allocation.
Data Source
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AI summary
Embodiments of the present invention provide a transmission method and user equipment, which can improve encoding and decoding performance of a discovery signal. The method includes: determining, by user equipment UE, a first discovery signal; obtaining, by the UE after encoding the first discovery signal, respective initial locations of k redundancy versions RVs of the first discovery signal, where k is a positive integer not less than 1; separately mapping, by the UE according to respective initial locations of f RVs of the k RVs, each RV of the f RVs to at least two physical resource block pairs PRB Pairs of a first resource location, where f is a positive integer not less than 1 and not greater than k; and transmitting, by the UE at the first resource location, the f RVs of the first discovery signal.