PUSCH Slot Allocation for Cell-Edge Uplink Coverage
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Solution Overview
Problem
Existing resource allocation methods for Physical Uplink Shared Channel (PUSCH) of User Equipments (UEs) in LTE networks do not effectively enhance coverage for cell-edge UEs due to limited power budget, leading to inefficient transmission strategies.
Innovation Solution
Implementing a resource allocation mode that allows uplink data transmission to be mapped on a plurality of slots with no symbols configured for downlink transmission, using slot bundling or sub-PRB modes, to enhance coverage by scheduling resources efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If sub-PRB resource allocation is used for coverage enhancement, then transmission power can be accumulated in time domain, but the resource allocation complexity increases and requires precise slot configuration
Solution Approach 1:
The patent changes the resource allocation parameters by introducing a new indication mechanism that specifies slot patterns (using bit fields) to identify which slots are available for uplink transmission. This allows the system to adapt resource allocation parameters dynamically based on coverage enhancement needs while maintaining manageable complexity through standardized indication methods.
Solution Approach 2:
The patent implements dynamic resource allocation where the network device can indicate different slot patterns for uplink transmission based on current channel conditions and coverage requirements. The resource allocation is not fixed but can be adjusted through retransmissions and adaptive slot selection, allowing the system to optimize power accumulation while adapting to changing conditions.
2Reliability
If uplink data is mapped on multiple slots, then coverage is enhanced through time-domain power accumulation, but transmission time increases
Solution Approach 1:
The patent segments the uplink transmission across multiple slots when coverage enhancement is required. By dividing the transmission into multiple time slots with proper power accumulation, the system achieves better coverage for cell-edge UEs. The segmentation is controlled through network indication of available slots and UE adaptation of transmission parameters.
Solution Approach 2:
The patent employs periodic transmission opportunities across slots, where the UE can transmit uplink data in indicated slots and perform retransmissions in subsequent available slots. This periodic action across time slots enables power accumulation while maintaining structured transmission timing through network-scheduled opportunities.
3Power
If slot bundling mode is used for resource allocation, then power accumulation in time domain is improved, but the flexibility of resource allocation decreases
Solution Approach 1:
The patent creates a universal resource allocation framework that can accommodate both slot bundling mode and non-slot-bundling modes through a unified indication mechanism. The network device can indicate different slot patterns that work for both modes, making the system multi-functional and adaptable to different coverage enhancement scenarios without requiring separate dedicated mechanisms.
Data Source
AI summary
Embodiments of the present disclosure relate to devices, methods, devices and computer readable storage media of resource allocation for coverage enhancement. The method comprises receiving, at a terminal device and from a network device, an indication of a resource allocation mode to perform an uplink data transmission, the resource allocation mode at least indicating resources allocated for the uplink data transmission being to be mapped on a plurality of slots, the plurality of slots comprising no symbols configured for downlink transmission; and transmitting the uplink data transmission based on the indication. In this way, the capability of coverage enhancement for the User Equipments (UEs) can be improved by scheduling the resources for the Physical Uplink Shared Channel (PUSCH) according to the approach of resource allocation of the present disclosure.