PDCCH Search Space Decoding for Mobile Station Identity
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Solution Overview
Problem
Conventional techniques complicate system design by using different signals for PUSCH persistent scheduling and periodic channel feedback, making efficient switching between them difficult, and increase unnecessary processing in mobile station apparatuses.
Innovation Solution
A mobile station apparatus that defines a search space for a physical downlink control channel based on a mobile station identity assigned by the base station, allowing for decoding processing of both persistently and temporarily allocated resources, enabling efficient switching between uplink resources for channel feedback reports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different signals are used for PUSCH persistent scheduling and periodic channel feedback, then the functions can be clearly distinguished, but the system design becomes complicated and switching between them becomes difficult
Solution Approach 1:
The patent combines persistent scheduling and periodic channel feedback into a single PDCCH signal structure. The base station transmits both types of information through one unified downlink control signal, allowing the mobile station to interpret different portions as either persistent scheduling assignments or periodic channel feedback requests based on predefined rules, thereby simplifying system design while maintaining functional distinction
Solution Approach 2:
The PDCCH signal is designed to serve multiple functions simultaneously. The same downlink control signal structure is used for both persistent scheduling notifications and periodic channel feedback requests, making the signal universal and multi-functional, which reduces the number of separate signal types needed and simplifies the overall system architecture
2Adaptability or versatility
If multiple mobile station identities are monitored in the same search space, then resource allocation flexibility is improved, but decoding processing load increases
Solution Approach 1:
The patent extracts and processes mobile station identities separately within the unified PDCCH structure. The mobile station identifies its own identity from the set of monitored identities and processes only the relevant portions of the PDCCH signal that pertain to its specific allocations, rather than decoding all possible identity combinations, thereby reducing processing load while maintaining flexibility
Solution Approach 2:
The PDCCH search space is segmented into multiple candidate positions, each potentially containing control information for different mobile station identities. The mobile station performs targeted decoding at specific segments based on its assigned identities, rather than uniformly processing the entire search space, which improves decoding efficiency while maintaining resource allocation flexibility
Data Source
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AI summary
In a mobile communication system in which an space of a physical downlink control channel for a mobile station apparatus to search is defined based on a mobile station identity assigned from a base station apparatus, the base station apparatus places a physical downlink control channel including a first mobile station identity or a physical downlink control channel including a second mobile station identity in a search space of a physical downlink control channel corresponding to the first mobile station identity when the base station apparatus assigns a plurality of mobile station identities to the mobile station apparatus, and when a plurality of mobile station identities is assigned from the base station apparatus, the mobile station apparatus performs decoding processing of the physical downlink control channel including the first mobile station identity and the physical downlink control channel including the second mobile station identity in the search space of the physical downlink control channel corresponding to the first mobile station identity.