Uplink Grant Detection for Partial TDM Operation
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Solution Overview
Problem
Current Time Division Multiplexing (TDM) operation in High Speed Uplink Packet Access (HSUPA) is inefficient due to significant signaling overhead and limited flexibility, as it typically allows only one User Equipment (UE) to transmit at a time, leading to suboptimal utilization of cell resources and interference issues.
Innovation Solution
The implementation of an Enhanced Absolute Grant Channel (E-AGCH) message with different types of grants, where the first type is susceptible to grant detection and the second type is not, allowing UEs to dynamically adjust their transmission based on detected E-AGCH transmissions to other UEs, using Enhanced Radio Network Temporary Identities (E-RNTIs) and scope bits to differentiate between grant types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If pure TDM operation is implemented where only one UE transmits at a time, then interference between UEs is eliminated, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent segments the grant into two distinct types: susceptible grants and non-susceptible grants. This segmentation allows the system to differentiate between grants that should trigger grant detection (susceptible) and those that should not (non-susceptible), enabling multiple UEs to simultaneously transmit with non-susceptible grants while maintaining TDM operation with susceptible grants, thereby improving resource utilization without causing interference
Solution Approach 2:
The patent introduces dynamic grant detection capability where UEs can dynamically adjust their transmission behavior based on detecting E-AGCH messages intended for other UEs. When a UE detects an E-AGCH message for another UE, it can dynamically change its susceptible grant to a zero grant, allowing the system to adaptively control interference and resource allocation in real-time, improving overall resource utilization
2Productivity
If grant detection is enabled for all grants, then resource utilization improves through flexible scheduling, but signaling overhead increases
Solution Approach 1:
The patent applies local quality by making grant detection susceptibility a property of individual grants rather than a system-wide setting. Each grant can be independently marked as susceptible or non-susceptible based on specific scheduling requirements, allowing grant detection to be applied only where necessary (local) rather than universally (global), thereby reducing unnecessary signaling overhead while maintaining resource utilization benefits where needed
Solution Approach 2:
The patent implements partial grant detection by enabling it only for susceptible grants rather than all grants. This partial application of grant detection allows the system to achieve resource utilization improvements in scenarios where flexible scheduling is beneficial while avoiding the signaling overhead associated with universal grant detection, effectively applying the principle of doing just enough detection to achieve the desired performance
3Productivity
If multiple UEs are scheduled simultaneously, then resource utilization improves, but interference between UEs occurs
Solution Approach 1:
The patent segments the uplink transmission into two categories: UEs transmitting with susceptible grants and UEs transmitting with non-susceptible grants. This segmentation allows the system to schedule multiple UEs simultaneously using non-susceptible grants (improving resource utilization) while maintaining the ability to enforce TDM operation with susceptible grants (preventing interference), thereby resolving the contradiction between simultaneous transmission and interference avoidance
4Ease of operation
If TDM scheduling is implemented with short transmission durations, then fairness among UEs is improved, but productivity deteriorates due to frequent scheduling switches
Solution Approach 1:
The patent introduces dynamic grant detection that allows UEs to monitor E-AGCH messages and automatically adjust their transmission based on detected grants for other UEs. This dynamic mechanism enables the system to maintain fairness by allowing multiple UEs to transmit simultaneously (improving productivity) while ensuring that when one UE detects a grant for another UE, it can dynamically cease transmission to maintain fairness, thereby resolving the contradiction between fairness and productivity
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for ‘partial’ time division multiplexing (TDM) operation are provided. One example of a method includes transmitting, by a base station, an Enhanced Absolute Grant Channel (E-AGCH) message to one or more user equipment. The E-AGCH message may comprise an indication of one of a first type grant or a second type grant indicating whether a grant is susceptible to grant detection. The first type of grant is considered susceptible to grant detection, and the second type of grant is considered not susceptible to grant detection.