PRACH RO Group Configuration for Flexible SSB Index Mapping
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Solution Overview
Problem
Current communication systems are limited by fixed SSB indexes associated with different ROs, restricting the flexibility in adjusting the quantity of SSBs sent by the radio access network device, which affects the uplink coverage of the physical random access channel (PRACH).
Innovation Solution
The method allows for flexible adjustment of the quantity of SSBs by associating multiple ROs with the same SSB index, enabling the radio access network device to determine K ROs, where K is greater than 1, and these ROs can have different SSB indexes, thereby improving PRACH coverage performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SSB indexes associated with different ROs are fixed, then the radio access network device can perform combined decoding based on a preamble received in different ROs, but this limits the quantity of SSBs and prevents flexible adjustment
Solution Approach 1:
The patent applies dynamics by making the association relationship between SSB indexes and ROs adjustable rather than fixed. The network device can dynamically configure which SSB indexes are associated with each RO through RRC signaling, allowing the system to adapt to different deployment scenarios and coverage requirements while maintaining operational flexibility.
Solution Approach 2:
The patent changes the parameter of SSB index association from a fixed value to a configurable parameter. By allowing the network device to configure different SSB indexes for different ROs through signaling parameters, the system can adjust the quantity and distribution of SSBs according to actual network conditions, resolving the contradiction between fixed structure and flexible adjustment.
2Adaptability or versatility
If the quantity of SSBs is limited to be an integer multiple of SSB indexes associated with one RO, then the system maintains simple decoding, but the quantity of SSBs cannot be flexibly adjusted based on requirements
Solution Approach 1:
The patent makes the quantity of SSBs dynamically adjustable by allowing the network device to configure different numbers of SSB indexes for different ROs. This dynamic configuration enables the system to adjust the total quantity of SSBs according to actual network requirements without being constrained by fixed integer multiple relationships.
Solution Approach 2:
The patent segments the association between SSB indexes and ROs into configurable units. Instead of requiring the entire SSB set to be an integer multiple of a fixed association, the system can divide and configure SSB indexes individually for each RO, allowing flexible adjustment of the total SSB quantity while maintaining manageable decoding complexity.
3Reliability
If PRACH repetition is performed with a fixed quantity of ROs in one RO group, then uplink coverage is improved, but the configuration cannot be optimized for different scenarios
Solution Approach 1:
The patent applies dynamics by making the RO group configuration adjustable. The network device can dynamically determine the quantity of ROs in each RO group and configure which specific ROs belong to each group through RRC signaling. This allows the system to optimize PRACH repetition configurations for different coverage scenarios while maintaining the reliability benefits of repetition.
Solution Approach 2:
The patent changes the RO group configuration from a fixed structure to a parameterizable structure. By allowing the network device to configure the quantity and composition of RO groups through signaling parameters, the system can adjust PRACH repetition parameters to match different coverage requirements, optimizing both reliability and adaptability.
Data Source
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AI summary
A communication method and a related apparatus are provided. The method includes: receiving configuration information from a radio access network device, where the configuration information is for configuring a quantity K of ROs in one RO group, and K is an integer greater than 1; and determining the K ROs based on the configuration information, where the K ROs are all associated with a same SSB index, the K ROs include at least two ROs, and the at least two ROs are further associated with different SSB indexes. In this way, even if a quantity of indexes of SSBs sent by the radio access network device is not an integer multiple of a configured quantity of SSB indexes associated with one RO and the configured quantity is configured by the radio access network device, the K ROs may be determined based on the foregoing solution. In other words, a quantity of SSBs sent by the radio access network device does not need to be limited. In this way, the radio access network device can flexibly adjust the quantity of sent SSBs based on a requirement.