Random Access Response Segmentation for Multi-TRP Reliability
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Solution Overview
Problem
Current mobile communication networks face challenges in efficiently managing and optimizing communication protocols across diverse wireless devices and base stations, particularly in supporting multiple technologies and releases, which leads to suboptimal performance and resource utilization.
Innovation Solution
The implementation of New Radio (NR) user plane and control plane protocol stacks, along with advanced beam management and bandwidth adaptation techniques, enables flexible and efficient communication by configuring wireless devices and base stations to adapt to varying traffic conditions and device capabilities, optimizing protocol stacks and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wireless device receives random access responses from multiple TRPs, then the reliability of random access is improved, but the device complexity increases due to needing to process multiple RARs with different MAC layer entities
Solution Approach 1:
The patent segments the random access response processing by associating each RAR with a specific MAC entity based on the TC-RNTI value. When multiple RARs are received from different TRPs, each is processed by a dedicated MAC entity (first MAC entity for first RAR, second MAC entity for second RAR), preventing processing conflicts and reducing overall device complexity while maintaining reliability through parallel processing paths.
2Adaptability or versatility
If the network supports multiple technologies and releases, then the adaptability of the communication system is improved, but the protocol stack complexity increases
Solution Approach 1:
The patent implements a universal MAC entity structure that can handle multiple technologies and releases through a unified interface. The MAC entity is designed to process RARs from different TRPs and support various random access procedures (4-step and 2-step) within a single architectural framework, enabling multi-functionality without requiring separate protocol stacks for each technology.
Solution Approach 2:
The patent introduces dynamic configuration of MAC entities based on operational needs. MAC entities can be activated or deactivated depending on the random access procedure being performed (4-step or 2-step), allowing the system to adapt its complexity dynamically rather than maintaining fixed complex structures for all scenarios simultaneously.
3Productivity
If random access responses are transmitted from multiple TRPs simultaneously, then the communication efficiency is improved, but the risk of processing conflicts at the MAC layer increases
Solution Approach 1:
The patent applies local quality by assigning different processing characteristics to different MAC entities based on their associated RARs. Each MAC entity is specialized to handle specific RARs from particular TRPs, creating locally optimized processing paths that prevent conflicts while maintaining overall system efficiency through differentiated handling of simultaneous responses.
Data Source
AI summary
A wireless device transmit a first message comprising a first preamble and a first transport block. The first transport block comprises a contention resolution identifier of the wireless device. The wireless device receive a first random access response to the first message. The first random access response comprises the contention resolution identifier. The wireless device starts a first time window in response to receiving the first random access response. The wireless device monitor, during the first time window, a downlink channel for a second random access response to the first message. The wireless device determines a failure to receive the second random access response during the first time window. The wireless device transmits a second message comprising a second preamble in response to the failure.