Random Access Response Search Space Configuration for Interference Mitigation
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, the existing methods for performing a random access procedure face challenges in mitigating interference from neighbor cells, which affects the reception of downlink control channels and limits the capacity of control channels.
Innovation Solution
The method involves setting and blind-decoding multiple search spaces for Random Access Response (RAR) messages, using different frequency groups, time units, preamble formats, or preamble sequence indexes to minimize interference, allowing the User Equipment (UE) to receive the RAR message effectively by configuring separate search spaces with reduced interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single search space is used for RAR message reception, then the device complexity is reduced, but the reliability deteriorates due to interference from neighbor cells
Solution Approach 1:
The patent divides the search space into multiple separate search spaces (first search space and second search space) for receiving RAR messages. Each search space is configured with different parameters such as different frequency groups, time units, preamble formats, or preamble sequence indexes. This segmentation allows the UE to select an appropriate search space based on interference conditions, thereby improving reception reliability while maintaining manageable complexity through systematic configuration.
2Reliability
If multiple search spaces are configured for RAR message reception, then the reliability is improved by reducing interference, but the device complexity increases
Solution Approach 1:
The patent applies local quality by configuring different search spaces with distinct local characteristics (different frequency groups, time units, preamble formats, or sequence indexes) to suit different interference environments. Each search space is optimized for specific conditions, allowing the UE to locally adapt to interference patterns without requiring complete reconfiguration of the entire reception system.
3Adaptability or versatility
If existing random access methods are used, then the procedure is simple, but the control channel capacity is limited and interference from neighbor cells cannot be mitigated
Solution Approach 1:
The patent introduces additional dimensions for search space differentiation by configuring search spaces across multiple dimensions including frequency groups, time units, preamble formats, and preamble sequence indexes. This multi-dimensional approach expands the search space configuration space, enabling the system to mitigate interference by selecting appropriate combinations of parameters without fundamentally changing the random access procedure structure.
Data Source
AI summary
The present invention relates to a method for allowing a terminal to perform a random access procedure in a wireless communication system and a device therefor. Specifically, the method for allowing a terminal to perform a random access procedure in a wireless communication system comprises the steps of: setting a first search space for a first downlink control channel and/or a second search space for a second downlink control channel according to control channel configuration information of a terminal; and detecting a downlink data channel by blind decoding the first search space and/or the second search space, wherein the first downlink control channel and the second downlink control channel are detected by using different indicators.