Idle-Mode SSB Reception for Multi-TRP Beam Indication
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Solution Overview
Problem
The current 5G system limitations in SSB beam sweeping are insufficient for future systems using multiple Transmission Reception Points (TRPs) with overlapping coverage, leading to increased power consumption and resource overhead due to the maximum number of candidate SSB beams being exceeded, and existing solutions complicate UE measurement and increase interference.
Innovation Solution
A base station transmits indications to UEs in idle mode about the number of TRPs and beams being used, allowing UEs to efficiently determine candidate time domain locations for SSB reception, reducing power consumption and resource overhead through TRP-specific PBCH DMRS and bitmaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the maximum number of candidate SSB beams is increased to support multiple TRPs, then the coverage and adaptability are improved, but the resource overhead and power consumption increase
Solution Approach 1:
The base station transmits indication information about the number of TRPs and beams in advance before the UE needs to perform measurements. This allows the UE to pre-determine the candidate time domain locations for SSB reception, avoiding unnecessary power consumption by not attempting to receive beams that are not actually transmitted.
Solution Approach 2:
The base station provides feedback information (indication information) to the UE about the actual number of TRPs and beams being used. This feedback enables the UE to adjust its measurement behavior accordingly, only measuring at locations where SSBs are actually transmitted, thus reducing power consumption while maintaining adaptability.
2Adaptability or versatility
If the maximum number of candidate SSB beams is increased to support multiple TRPs, then the coverage and adaptability are improved, but the resource overhead increases
Solution Approach 1:
The base station transmits indication information about the number of TRPs and beams in advance. This allows the UE to pre-determine the candidate time domain locations, avoiding the need to monitor all possible beam locations and reducing the resource overhead for SSB reception.
Solution Approach 2:
Instead of the UE attempting to receive all possible SSB beams (excessive action), the UE only receives SSBs at the candidate locations indicated by the base station (partial action). This reduces resource overhead while maintaining sufficient coverage for the actual TRPs being used.
3Object-affected harmful factors
If all SSB beams are transmitted with different time resources, then the interference is minimized, but the measurement complexity and time consumption increase
Solution Approach 1:
The base station transmits indication information in advance about which time domain locations will contain SSB transmissions. This allows the UE to focus measurement time only on those specific locations, reducing overall measurement time while maintaining low interference by still separating beams in time.
Data Source
AI summary
A radio terminal receives, via a signal, physical channel, or message to be received by at least a plurality of radio terminals in an idle mode, a first indication indicating a number of transmission points that can be or are being used in a cell. For example, this can help to enable radio terminals to be aware of the number of transmission points that can be or are being used in a cell, or the number of beams that can be or are being transmitted simultaneously in the same time and frequency resources in a cell.