Uplink Data Channel Enhancement Mode for PUSCH Coverage Expansion
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Solution Overview
Problem
The existing LTE/LTE-Advanced system lacks a method for setting a transmission mode and performing blind decoding to expand the coverage of the physical uplink shared channel (PUSCH) for user equipment (UE) receiving downlink control information via the physical downlink control channel (PDCCH) or enhanced physical downlink control channel (EPDCCH).
Innovation Solution
A method is introduced to establish an uplink data channel enhancement mode, configure a specific downlink control information (DCI) format, and transmit it via the downlink control channel to enhance PUSCH coverage, involving the base station and user equipment (UE) in setting and monitoring transmission modes to receive appropriate DCI formats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a typical LTE/LTE-Advanced UE uses conventional PDCCH/EPDCCH for receiving DCI, then the system maintains standard operation, but the PUSCH coverage is limited and cannot be expanded
Solution Approach 1:
The patent introduces a new transmission mode (Transmission Mode 10) with modified DCI formats (0A and 0B) that change the parameter structure of uplink grants. These parameter changes include different resource allocation fields and modulation and coding scheme representations, enabling expanded PUSCH coverage by allowing the UE to transmit over multiple subframes with accumulated power while maintaining compatibility with existing LTE infrastructure
Solution Approach 2:
The patent segments the DCI format into multiple versions (0A and 0B) tailored for different coverage enhancement scenarios. Each DCI format contains specific field configurations optimized for coverage expansion, allowing the system to handle different PUSCH transmission requirements separately while operating within the unified LTE framework
2Reliability
If the UE performs blind decoding for SPS activation/deactivation, then real-time media support is enabled, but no method exists to expand PUSCH coverage for such UEs
Solution Approach 1:
The patent makes the DCI formats 0A and 0B universal for both scheduled and semi-persistent scheduling operations. The same DCI formats can be used for SPS activation, deactivation, and modification, as well as for dynamic scheduling, providing multi-functionality that enhances both reliability for real-time media and adaptability for different transmission scenarios including coverage enhancement
3Area of stationary object
If the base station configures new DCI formats for coverage enhancement, then PUSCH coverage is expanded, but the control channel complexity increases
Solution Approach 1:
The patent implements dynamic selection between different DCI formats (0A and 0B) based on the specific coverage enhancement needs and transmission conditions. The base station can dynamically choose which DCI format to use for each UE and each transmission opportunity, allowing flexible adaptation to varying coverage requirements without permanently increasing system complexity. The UE is configured to monitor for both formats, enabling dynamic optimization
Data Source
AI summary
Provided is a method of transceiving data via an uplink data channel for coverage expansion. The method may include establishing, by a base station, an uplink data channel enhancement mode for uplink data channel coverage enhancement of a user equipment; configuring a first downlink control information (DCI) format for the user equipment set with the uplink data channel enhancement mode; and transmitting the first DCI format via a downlink control channel.