Random Access Resource Configuration for MSG 3 Demodulation
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Solution Overview
Problem
In two-step random access procedures, the high demodulation failure rate of Message 3 (MSG 3) occurs due to conflicts caused by contention-based random access, leading to difficulties in demodulating MSG 3 and affecting access probability.
Innovation Solution
Configuring multiple resources for MSG 3 corresponding to each group of resources for MSG 1, allowing the network device to distinguish between terminals and reduce contention, thereby increasing the demodulation probability of MSG 3 and minimizing conflicts during uplink resource transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If contention-based random access is used for MSG 1, then access probability is improved, but demodulation probability of MSG 3 deteriorates due to conflicts
Solution Approach 1:
The patent segments the random access resources by configuring multiple PUCCH resources for each MSG 1 resource. This segmentation allows the system to separate the contention-based MSG 1 transmission from the uplink data transmission in MSG 3, enabling independent resource allocation and conflict resolution for each stage of the random access procedure.
Solution Approach 2:
The patent applies preliminary action by pre-configuring multiple PUCCH resources for MSG 3 before the actual random access occurs. The network device provides configuration information to the terminal in advance, specifying multiple uplink resources that can be used for MSG 3 transmission, so that when MSG 1 conflicts occur, the terminal already has alternative resources available for successful MSG 3 demodulation.
2Reliability
If multiple resources are configured for MSG 3, then demodulation probability increases, but device complexity increases
Solution Approach 1:
The patent makes the PUCCH resources universal by configuring them to serve multiple purposes. The same set of PUCCH resources can be associated with multiple different MSG 1 resources, allowing these resources to handle uplink transmissions from various terminals regardless of which specific MSG 1 resource they initially used. This multi-functionality reduces the total number of resources needed while maintaining high demodulation probability.
Solution Approach 2:
The patent changes the parameter of resource association from one-to-one to one-to-many mapping. Instead of assigning a single dedicated PUCCH resource to each MSG 1 resource, the system changes the mapping parameter to allow multiple PUCCH resources to be associated with each MSG 1 resource, thereby increasing flexibility and reducing overall system complexity.
3Reliability
If response window is aligned with MSG 3 resources, then conflicts for MSG B are minimized, but configuration complexity increases
Solution Approach 1:
The patent merges the response window configuration with the MSG 3 resource configuration. By aligning the timing and resources of the response window with the pre-configured PUCCH resources for MSG 3, the system combines two separate configuration tasks into a unified resource allocation scheme, reducing overall configuration complexity while ensuring conflict minimization for MSG B.
Data Source
AI summary
Provided are a resource configuration method, a random access method, a network side device and a terminal. The method comprises: sending first configuration information to a terminal, wherein the first configuration information is first configuration information of a first message that is randomly accessed, and the first message comprises: a preamble and a load; and the first configuration information is used for configuring at least one first resource for sending the preamble and at least one second resource that corresponds to each first resource respectively and is used for sending the load.