Random Access Response Timing for UE Baseband Decoding Limits
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Solution Overview
Problem
In the NR Rel-18 version, the scheduling bandwidth of the random access response exceeds the baseband processing capability of the UE, leading to decoding failures and random access failures.
Innovation Solution
The terminal device resends the physical random access channel in an extended time period to allow for more processing time, and the network device monitors the channel in an extended time period to accommodate the UE's baseband processing limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the scheduling bandwidth of the random access response is increased to meet network capacity requirements, then the network can support more users and higher data rates, but the bandwidth exceeds the baseband processing capability of the UE, causing decoding failures
Solution Approach 1:
The patent segments the random access response bandwidth by configuring multiple bandwidth parts (BWPs), where each BWP has a bandwidth within the UE's baseband processing capability. The network schedules the random access response in a first BWP with bandwidth exceeding UE capability, then switches to a second BWP with bandwidth within UE capability for the actual response transmission, dividing the problem into manageable parts.
Solution Approach 2:
The patent changes the bandwidth parameter dynamically by switching between different bandwidth parts. The network configures multiple BWPs with different bandwidth parameters, and the UE switches between them based on the random access response scheduling, allowing the system to adapt the bandwidth parameter to match UE processing capabilities while maintaining network capacity.
2Reliability
If the UE processing time is extended to accommodate larger bandwidth decoding, then the random access latency increases, but the UE can successfully decode the physical downlink shared channel
Solution Approach 1:
The patent performs preliminary action by pre-configuring multiple bandwidth parts with different bandwidth parameters before the random access procedure. The UE and network have the BWP configuration information ready in advance, so when the random access response needs to be transmitted, the network can immediately switch to the appropriate BWP without extended processing time, maintaining low latency while ensuring successful decoding.
3Productivity
If the random access response is transmitted in a bandwidth exceeding UE baseband processing capability, then the network can efficiently utilize available spectrum resources, but the UE fails to complete processing such as decoding and parsing
Solution Approach 1:
The patent introduces an intermediary mechanism through the bandwidth part switching function. The network acts as an intermediary by scheduling the random access response in a first BWP and then switching to a second BWP that the UE can process. This intermediary BWP switching mechanism allows the network to utilize wide spectrum resources while ensuring the UE can successfully process the response within its baseband capability.
Data Source
AI summary
A communication method and apparatus, the method including sending a first physical random access channel to a network device, and sending the first physical random access channel to the network device in a first time period in response a first random access response corresponding to a third physical random access channel not being received in a first random access response time window, where a duration of the first time period is greater than a duration of a second time period, the first time period corresponds to a first-type terminal device, the second time period is used by a second-type terminal device to re-perform random access in response to a second random access response not being received in a random access response time window, and the second random access response is a random access response corresponding to a physical random access channel sent by the second-type terminal device.