Signaling Multiple PUSCH Resources for Msg3 Transmissions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The current 5G wireless communication system faces inefficiencies in signaling multiple resources for Message 3 (Msg3) transmissions, particularly in unlicensed bands, leading to excessive signaling and potential failures due to listen-before-talk (LBT) limitations, which hinder the efficient handling of random access procedures.
Innovation Solution
The proposed solution involves signaling multiple Physical Uplink Shared Channel (PUSCH) resources for Msg3 through new parameters such as 'duration', 'slotBitmap', and 'offset' within the random access response (RAR), allowing for efficient allocation and utilization of resources, thereby reducing the need for retransmissions and enhancing contention resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple resources for Msg3 transmissions are signaled in the current 5G system, then the capacity to handle random access procedures is improved, but the signaling overhead and complexity increase excessively
Solution Approach 1:
The patent segments the resource allocation by introducing separate fields for time resources (duration, slotBitmap) and frequency resources (prb-Offset, prb-Length). This segmentation allows independent optimization of time and frequency dimensions, enabling multiple Msg3 transmission opportunities without proportionally increasing overall signaling complexity.
Solution Approach 2:
The patent applies preliminary action by pre-configuring the time resource parameters (duration, slotBitmap, offset) in the RAR message before the actual Msg3 transmission. This allows the UE to prepare and identify suitable transmission slots in advance, reducing real-time signaling processing complexity while maintaining the ability to handle multiple resources.
2Reliability
If multiple PUSCH resources are allocated for Msg3 in unlicensed bands, then the reliability of random access is improved, but the listen-before-talk failures increase due to channel occupancy constraints
Solution Approach 1:
The patent introduces dynamic time resource allocation through the duration and slotBitmap fields, allowing the network to flexibly adjust the available transmission opportunities based on real-time channel conditions. This dynamic adaptation enables the system to maintain reliability while accommodating LBT constraints in unlicensed bands.
Solution Approach 2:
The patent resolves the LBT limitation by adding a time-domain dimension to resource allocation through the offset and duration parameters. Instead of only frequency-based allocation, the system now provides multiple time-shifted opportunities for Msg3 transmission, allowing UEs to attempt transmission at different times to overcome LBT failures.
3Productivity
If the network provides detailed time resource allocation for Msg3, then the efficiency of resource utilization is improved, but the processing burden on the terminal increases
Solution Approach 1:
The patent segments the time resource indication into distinct parameters: offset (starting slot), duration (number of slots), and slotBitmap (active slots within duration). This segmentation provides detailed allocation information while keeping each parameter simple and easily processable by the terminal, avoiding excessive processing complexity.
Solution Approach 2:
The patent uses parameter changes by representing time resources through standardized numerical parameters (offset in slots, duration in slots) rather than absolute time values. This parameterization maintains detailed allocation information while simplifying terminal processing, as the UE can easily convert these parameters into transmission timing without complex calculations.
Data Source
AI summary
A communication method and system for converging a fifth generation (5G) communication system for supporting higher data rates beyond a fourth generation (4G) system with a technology for Internet of things (IoT) are provided. A method of a terminal for performing a random access procedure in this manner includes transmitting a random access preamble to a base station, receiving a random access response (RAR) from the base station, and identifying whether each media access control (MAC) sub-protocol data unit (subPDU) in the received RAR includes a random access preamble identifier (RAPID) corresponding to the random access preamble. The RAR includes a plurality of MAC subPDUs including the RAPID corresponding to the random access preamble.