Cooperative Uplink Resource Management for Cell-Edge Relaying
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Solution Overview
Problem
Current wireless communication systems face challenges in managing resources for cooperative uplink transmission, particularly at cell edges, where direct transmission between user equipment (UE) and the base station is not feasible, leading to performance issues due to power limitations and interference.
Innovation Solution
The implementation of uplink cooperative MIMO relaying, where UEs are grouped and configured to transmit data as sources or relays, with mode configurations determined by group membership and transmission time interval, utilizing either exhaustive or fast algorithms to determine cooperative sets of relays for efficient resource allocation and power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cooperative uplink transmission is implemented at cell edges, then coverage and data rates are improved, but resource management complexity increases
Solution Approach 1:
The patent divides UEs into different groups (first group and second group) with distinct roles - source UEs that transmit data and relay UEs that forward data. This segmentation allows simplified resource management where each group follows predetermined rules based on their assigned function, reducing overall system complexity while enabling cooperative transmission benefits at cell edges.
Solution Approach 2:
The patent pre-configures UEs with mode configurations indicating their roles (source or relay) before transmission begins. This preliminary assignment of functions allows UEs to automatically determine their operations based on group membership and TTI index without real-time complex decision-making, reducing resource management complexity while maintaining improved cell-edge performance.
2Productivity
If UEs are configured to transmit as sources or relays with mode configurations, then data transmission efficiency is improved, but signaling overhead increases
Solution Approach 1:
The patent implements periodic role reversal between source and relay UEs based on TTI index. UEs in the first group transmit as sources during even TTIs and as relays during odd TTIs, while UEs in the second group do the opposite. This periodic switching maximizes data transmission efficiency by utilizing all UEs in both capacities while requiring minimal signaling - only the initial group assignment and TTI index are needed to determine current roles.
3Reliability
If opportunistic relaying is used to enhance coverage, then transmission reliability is improved, but power consumption increases
Solution Approach 1:
The patent enables relay transmission only when necessary - specifically when source UEs are at cell edges where direct transmission to the base station is not feasible. Relays are activated selectively based on channel conditions and UE location, providing improved transmission reliability for edge users while avoiding unnecessary power consumption for UEs that can transmit directly to the base station.
Data Source
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AI summary
Certain aspects of the present disclosure relate to techniques for managing resources for cooperative uplink transmission. A base station may determine different goups for a plurality of user equipments (UEs) participating in cooperative uplink transmission, and transmit mode configurations indicating whether or not UEs in each group are configured to transmit data as a data source or to relay data received from another UE configured to transmit data as a data source. A UE may participate, with one or more other UEs, in cooperative uplink transmission to the base station, wherein each UE belongs to a group. The UE may determine, for a transmission time interval (TTI), at least one operation to perform for the cooperative uplink transmission based, at least in part, on a group number of a group to which the UE belongs and an index of the TTI.