PBCH DMRS Sequence Mapping for 5G Beam Sweeping Collision Reduction
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Solution Overview
Problem
In 5G mobile communication systems, the implementation of beam sweeping mechanisms poses challenges for reducing collisions of Physical Broadcast Channel (PBCH) Demodulation Reference Signals (DMRS) between cells, as existing designs do not effectively manage beam indication information during resource mapping and transmission.
Innovation Solution
The method involves generating candidate PBCH DMRS sequences and determining a mapping relationship between these sequences and Resource Elements (RE) groups, allowing for appropriate planning of beams to correspond to different synchronization signal block indices, thereby minimizing collisions by modulating and transmitting the sequences using specific RE groups based on cell identities and synchronization block indices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If beam sweeping mechanism is implemented to increase coverage area, then coverage area is improved, but collisions of PBCH DMRS between cells increase
Solution Approach 1:
The patent segments the PBCH DMRS sequences into multiple candidate sequences (e.g., 8 sequences) that are orthogonal to each other. Each candidate sequence is associated with different SS block indices, allowing the system to differentiate between multiple beams and cells using orthogonal sequences, thereby reducing collisions while maintaining beam sweeping for coverage extension.
Solution Approach 2:
The patent applies local quality by making different parts of the system (different cells or different beams) use different candidate PBCH DMRS sequences based on their specific characteristics such as cell identity and SS block index. This localized differentiation ensures that each beam or cell has a unique sequence signature, reducing inter-cell and inter-beam collisions while allowing each to maintain its coverage function.
2Measurement precision
If multiple candidate PBCH DMRS sequences are used to reduce collisions, then detection precision is improved, but device complexity increases
Solution Approach 1:
The patent changes parameters such as cell identity and SS block index to select different candidate PBCH DMRS sequences. By varying these parameters, the system can generate appropriate orthogonal sequences for different cells and beams without requiring complex manual configuration, thus improving detection precision while keeping the complexity manageable through systematic parameter-based selection.
Data Source
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AI summary
A signal processing method and apparatus, a device, and a computer readable storage medium are provided, which relate to the field of communication technology, to reduce collisions of physical broadcast channel (PBCH) demodulation reference signals (DMRSs). The signal processing method provided by embodiments of the present disclosure includes: generating a plurality of candidate PBCH DMRS sequences; acquiring a mapping relationship between PBCH DMRS sequences and resource element (RE) groups; and transmitting the candidate PBCH DMRS sequences by using RE groups corresponding to the candidate PBCH DMRS sequences according to the mapping relationship. Therefore, the embodiments of the present disclosure may reduce collisions of PBCH DMRSs.