Joint Random Access Response Using Single RA-RNTI
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Solution Overview
Problem
Existing random access methods in communication technologies lead to inefficient use of communication resources due to the need for separate responses for each random access preamble, especially in scenarios with varying quantities of user equipment, resulting in resource wastage and low efficiency.
Innovation Solution
A method where a terminal device sends a random access preamble to a network device, and the network device responds jointly to one or more preambles using a single random access radio network temporary identifier (RA-RNTI), associated with a group index and parameter set, including OFDM symbol and frequency indices, to optimize resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate random access responses are sent for each preamble using separate RA-RNTIs, then each terminal device can be individually acknowledged, but communication resources are wasted and random access efficiency decreases
Solution Approach 1:
The patent combines multiple random access responses into a single joint response message (MSG2) that can acknowledge multiple preambles simultaneously. Instead of sending separate responses for each preamble, the network device aggregates responses for multiple terminal devices into one message, reducing resource consumption while maintaining individual acknowledgment capability through preamble index identification.
Solution Approach 2:
The joint random access response message serves multiple functions simultaneously: it acknowledges multiple preambles from different terminal devices, provides uplink scheduling information, and enables random access for multiple UEs in a single transmission. This multi-functional approach eliminates the need for separate dedicated responses for each terminal.
2Adaptability or versatility
If multiple RA-RNTIs are used for different random access resources, then each resource can be independently managed, but device complexity and resource overhead increase
Solution Approach 1:
The patent merges the functionality of multiple RA-RNTIs into a single RA-RNTI that identifies the joint random access response message. Instead of requiring terminal devices to monitor and manage multiple RA-RNTIs for different resources, the invention uses one RA-RNTI to indicate the presence of a joint response containing multiple preamble acknowledgments, thereby reducing complexity while maintaining resource management capability.
3Reliability
If one terminal device performs random access on resources associated with multiple downlink signals, then coverage is improved, but resource wastage occurs due to separate responses
Solution Approach 1:
The patent applies merging by consolidating random access responses for multiple downlink signal associations into a single joint response message. When a terminal device performs random access on resources associated with multiple downlink signals, the network device sends one joint MSG2 that acknowledges all relevant preambles, eliminating the need for separate responses and reducing resource wastage while maintaining successful access across multiple beams.
Data Source
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AI summary
This application discloses a random access method, a random access response method, a terminal device, and a network device. The random access method includes: sending, to a network device, at least one random access preamble on a plurality of random access resources associated with one downlink/uplink signal or one downlink/uplink signal group, where the random access resources correspond to one random access radio network temporary identifier; and receiving a random access response from the network device, where the random access response is a response to the at least one random access preamble. This application further discloses a corresponding random access response method, terminal device, and network device. In the technical solutions of this application, a joint response is made to one or more random access preambles on a plurality of random access resources associated with one downlink/uplink signal or one downlink/uplink signal group, thereby saving communication resources and improving efficiency of a random access process.