Relay Node Synchronization Blocks for Low-Power Beam Coverage
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Solution Overview
Problem
In network densification with millimeter wave communication, relay nodes face challenges in maintaining system synchronization, beam measurement, and mobility management due to limited coverage and increased power consumption when forwarding synchronization signal blocks in a beam sweeping manner.
Innovation Solution
A method and apparatus that involve a node receiving and transmitting synchronization signal blocks with different indexes, including physical broadcast channels and demodulation reference signals, to improve coverage and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a relay node forwards synchronization signal blocks received from a base station in a beam sweeping manner, then coverage capability is improved, but power consumption increases and the relay node may not be located in coverage of all beams
Solution Approach 1:
The relay node generates second type synchronization signal blocks that are copies or derived versions of the first type synchronization signal blocks received from the base station. By creating these copied signal blocks with different indexes and transmitting them through different panels, the relay node extends coverage without needing to receive and forward all beams from the base station, thereby reducing power consumption while maintaining expanded coverage capability.
2Use of energy by moving object
If a relay node forwards only some synchronization signal blocks due to limited beam coverage, then power consumption is reduced, but coverage of the relay node is affected and system synchronization may be compromised
Solution Approach 1:
The relay node changes the index parameter of the synchronization signal blocks it transmits. Specifically, it transmits second type synchronization signal blocks with indexes that differ from the first type synchronization signal blocks it receives. This parameter change allows the relay node to provide diverse synchronization signals to user equipment, ensuring that system synchronization is maintained even when the relay node cannot receive all beams from the base station, thereby improving reliability without increasing power consumption.
3Loss of information
If a relay node transmits synchronization signal blocks with the same index as received, then signaling overhead is reduced, but the probability of successful access by user equipment is reduced
Solution Approach 1:
The relay node introduces asymmetry in the synchronization signal transmission by ensuring that the indexes of the second type synchronization signal blocks it transmits are different from the indexes of the first type synchronization signal blocks it receives. This asymmetric indexing strategy increases the diversity of synchronization signals available to user equipment, improving the probability of successful access while maintaining efficient signaling overhead through the systematic generation of these differentiated signal blocks.
Data Source
AI summary
A method for a first node used for wireless communication and an apparatus are provided. The first node includes: a transceiver, configured to: receive one or more first type synchronization signal blocks, wherein each first type synchronization signal block in the one or more first type synchronization signal blocks includes first information; and an index of each first type synchronization signal block in the one or more first type synchronization signal blocks is one of a plurality of candidate synchronization signal block indexes; and, transmit one or more second type synchronization signal blocks, wherein each second type synchronization signal block in the one or more second type synchronization signal blocks includes the first information.