Random Access Response Differentiation Using Transmission Parameters
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in differentiating between various types of random access responses (RARs), leading to excessive resource consumption and increased latency due to the need for UEs to perform blind decoding of multiple PDCCH and PDSCH communications.
Innovation Solution
Implementing a transmission scheme that uses distinct transmission parameters, such as DMRS scrambling identifiers or RNTIs, to differentiate between different RAR types, allowing UEs to selectively decode only the relevant RARs based on their configured parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs perform blind decoding of multiple PDCCH and PDSCH communications to differentiate RAR types, then RAR type differentiation is achieved, but resource consumption and latency increase
Solution Approach 1:
The base station performs preliminary action by applying distinct transmission parameters (DMRS scrambling identifiers, RNTIs, or spatial parameters) to different RAR types before transmission. This allows the UE to identify the RAR type in advance through parameter matching without performing full blind decoding of multiple PDCCH/PDSCH communications, thereby reducing resource consumption while maintaining reliable differentiation.
2Reliability
If UEs perform blind decoding of multiple PDCCH and PDSCH communications to differentiate RAR types, then RAR type differentiation is achieved, but latency increases
Solution Approach 1:
The base station configures distinct transmission parameters for different RAR types in advance. When transmitting RARs, the base station applies the appropriate parameters, enabling the UE to quickly identify the RAR type through parameter matching rather than sequential blind decoding, thus reducing latency while ensuring accurate differentiation.
Solution Approach 2:
The invention uses transmission parameters (such as DMRS scrambling identifiers, RNTIs, or spatial parameters) as distinctive markers or 'colors' for different RAR types. The UE can rapidly identify the RAR type by matching these markers without performing time-consuming blind decoding of multiple communications, thereby reducing latency while maintaining reliable differentiation.
3Productivity
If distinct transmission parameters are used to differentiate RAR types, then resource consumption and latency are reduced, but system complexity increases
Solution Approach 1:
The invention changes existing transmission parameters (DMRS scrambling identifiers, RNTIs, or spatial parameters) to encode RAR type information. This approach leverages parameters already present in the system, avoiding the need for entirely new signaling mechanisms. The UE uses parameter matching logic to identify RAR types, which adds minimal processing complexity compared to full blind decoding, thus improving productivity while keeping system complexity manageable.
Data Source
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AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may receive configuration information that indicates a transmission parameter associated with a random access response (RAR) type; transmit a random access message associated with the RAR type; use the transmission parameter to obtain a physical downlink control channel (PDCCH) communication that schedules a physical downlink shared channel (PDSCH) communication that includes a RAR in a medium access control protocol data unit of the PDSCH communication; and obtain or refraining from obtaining the PDSCH communication based at least in part on whether the PDCCH communication is successfully obtained using the transmission parameter. Numerous other aspects are provided.