Reduced Capability UE Initial Cell Access via BWP Segmentation
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Solution Overview
Problem
Current wireless communication systems face challenges in initial cell access for reduced capability User Equipments (UEs) due to limited bandwidth and coverage requirements, which are not adequately addressed in existing initial cell access procedures.
Innovation Solution
The implementation of a method for reduced capability UEs to receive configuration information for downlink and uplink bandwidth parts, including indicators for BWP access barring, allowing them to perform initial access procedures using various frequency hopping designs without collisions with legacy UEs, by acquiring and monitoring specific control resource sets and system information blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If reduced capability UEs use the same initial access procedure as legacy UEs, then system compatibility is maintained, but access collisions occur between reduced capability UEs and legacy UEs
Solution Approach 1:
The patent segments the initial access procedure into separate pathways for reduced capability UEs and legacy UEs. Reduced capability UEs are directed to perform random access on secondary uplink carriers rather than the primary uplink carrier used by legacy UEs. This segmentation eliminates access collisions while maintaining system compatibility, as each UE type operates on dedicated access resources.
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of downlink control information (DCI) that mediates the access process. The DCI contains indicators that guide reduced capability UEs to appropriate secondary uplink carriers for random access. This intermediary signaling layer enables differentiated access without requiring changes to the legacy access procedure, thus resolving the contradiction between compatibility and collision avoidance.
2Reliability
If reduced capability UEs are allocated separate uplink carriers for random access, then access collision is avoided, but device complexity increases
Solution Approach 1:
The patent applies universality by using the same downlink control information (DCI) structure and signaling mechanisms for both reduced capability UEs and legacy UEs. The DCI format remains universal, but includes additional indicators that reduced capability UEs can interpret. This multi-functionality allows the same control channel to serve both UE types without increasing overall system complexity, while still providing dedicated access resources.
Solution Approach 2:
Reduced capability UEs autonomously determine their access procedure based on receiving specific indicators in the DCI. The UEs self-configure their random access parameters and select appropriate secondary uplink carriers without requiring complex network coordination or additional configuration messages. This self-service approach minimizes the complexity burden on the network side while achieving collision-free access.
3Reliability
If reduced capability UEs monitor multiple control resource sets, then access reliability is improved, but processing overhead increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring reduced capability UEs with information about multiple control resource sets (CORESETs) before the random access procedure. The network provides advance notification about which CORESETs to monitor and what indicators to look for in downlink control information. This preliminary configuration enables reduced capability UEs to efficiently monitor only relevant control resources during the access procedure, improving reliability without excessive processing overhead.
Data Source
AI summary
The present specification relates to a method, apparatus, and system for initial cell access in a wireless communication system. The present specification discloses reduced capability user equipment (UE) comprising: a communication module configured to receive configuration information for configuring a first downlink bandwidth part (DL BWP) and a first uplink bandwidth part (BWP) to be used for an initial access procedure, receive an indicator indicating BWP access barring of first user equipment in a second UL BWP and a second DL BWP for legacy-type second user equipment, and perform, on the basis of the indicator, the initial access procedure via at least one of the first DL BWP, the first UL BWP, the second DL BWP, and the second UL BWP; and a processor that controls the reception of the configuration information, the performance of the initial access procedure, and the reception of the indicator. The RedCap user equipment may smoothly perform the initial cell access, may perform a random access procedure without a collision with existing legacy-type user equipment, and may perform communication on the basis of various types of frequency hopping designs.