PDCCH Transmission Using Frequency Sub-band Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In LTE systems, the transmission of physical control format indicator channel (PCFICH) and physical downlink control channel (PDCCH) using massive MIMO technology with narrow beams results in interference and increased complexity due to overlapping beams, and existing technologies fail to effectively manage simultaneous transmission of different services on the same carrier.
Innovation Solution
The method involves sending PCFICH and PDCCH using narrow beams with non-overlapping resource allocation, allowing each signal set to occupy specific frequency sub-bands and time domain symbols, and using different air interface features for various services to reduce interference and improve transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PCFICH and PDCCH are transmitted using massive MIMO technology with narrow beams on system full bandwidth, then antenna gain is increased to compensate for path loss, but interference occurs between different beams and detection complexity increases
Solution Approach 1:
The patent divides the system bandwidth into multiple frequency sub-bands and assigns different signal sets (PCFICH and PDCCH) to different sub-bands. This segmentation prevents beam overlap and interference while maintaining the benefits of narrow beam transmission for signal reliability.
2Reliability
If narrow beams are used to ensure cell coverage with high antenna gain, then path loss is compensated, but the number of beams required increases system complexity
Solution Approach 1:
The patent segments the frequency spectrum into multiple sub-bands, allowing each sub-band to be served by a dedicated narrow beam. This reduces the total number of beams needed compared to covering the entire bandwidth with a single beam, while still achieving path loss compensation through focused transmission.
3Area of stationary object
If PCFICH and PDCCH are transmitted on system full bandwidth, then coverage is maximized, but simultaneous transmission of different services cannot be supported
Solution Approach 1:
The patent divides the system bandwidth into multiple frequency sub-bands and assigns different service types to different sub-bands. This allows simultaneous transmission of multiple services (e.g., VoIP, video, MTC) on the same carrier while maintaining broad coverage, as each service occupies a specific frequency portion.
Solution Approach 2:
The patent introduces frequency sub-band division as an additional dimension for service differentiation. By allocating services along the frequency dimension rather than requiring separate time or spatial resources, the system supports multi-service transmission while maintaining full bandwidth utilization for coverage.
4Productivity
If different services are transmitted on the same carrier, then carrier utilization is improved, but resource allocation complexity increases
Solution Approach 1:
The patent segments the carrier bandwidth into multiple frequency sub-bands and assigns each service type to specific sub-bands. This simple segmentation approach enables efficient carrier utilization for multiple services while avoiding complex dynamic resource allocation, as the frequency division is predetermined and static.
Data Source
Figure 1~2
Figure 3-a
Figure 3-b
AI summary
Embodiments of the present invention disclose a physical downlink control channel transmission method, and the method is used by a first wireless network device to send N signal sets, where each signal set is used to transmit control information of one or more second wireless network devices, a signal in the signal set includes a PDCCH or a PDCCH and a PCFICH. The method includes: sending, by the first wireless network device, each signal set to the second wireless network device on a resource that can be occupied by the signal set, where the first wireless network device performs sending processing on each signal set, and the sending processing includes at least one of multiplexing, scrambling, modulation, interleaving, or resource mapping. In the technical solutions disclosed in the embodiments of the present invention, interference between signal sets may be canceled, PCFICH and PDCCH transmission reliability may be improved, and the second wireless network device receives the PCFICH and the PDCCH on a resource of a received signal set, so as to reduce complexity of detecting a signal by the second wireless network device.