Scheduling Request Indicator for DRX Mode Resource Allocation
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Solution Overview
Problem
In wireless cellular communication networks, existing systems face inefficiencies in managing uplink resources and synchronization for user equipment (UE) in discontinuous reception (DRX) mode, particularly in transmitting scheduling requests and timing adjustments, which can lead to resource over-provisioning and increased latency.
Innovation Solution
The introduction of a scheduling request indicator (SRI) encoded with additional information bits allows UE in DRX mode to request uplink resources and timing adjustments efficiently, using a contention-free scheduling request channel, enabling on-demand resource allocation and reducing unnecessary transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UE in DRX mode uses traditional scheduling request mechanisms, then uplink resources are allocated periodically, but this causes resource over-provisioning and increased latency
Solution Approach 1:
The patent applies preliminary action by pre-configuring the UE with a scheduling request indicator (SRI) mechanism and encoded information bits before DRX mode activation. This allows the UE to efficiently request uplink resources and timing adjustments on-demand without waiting for periodic opportunities, thereby reducing latency while improving resource utilization efficiency.
2Loss of energy
If UE transmits scheduling requests and timing adjustments using existing channels, then synchronization is maintained, but uplink resources are not saved
Solution Approach 1:
The patent introduces a scheduling request indicator (SRI) as an intermediary mechanism that carries encoded information about timing adjustments and resource requests. This intermediary allows the UE to maintain synchronization accuracy while reducing uplink resource consumption by transmitting only necessary control information through the contention-free scheduling request channel rather than using full uplink shared channel resources.
3Productivity
If UE uses contention-free scheduling request channel with SRI, then resource allocation is optimized, but additional encoding complexity is introduced
Solution Approach 1:
The patent applies parameter changes by encoding timing adjustment information and resource request indicators into the SRI using modular arithmetic operations. The encoder modifies parameters such as the encoded timing adjustment value and resource indicator based on pre-configured parameters, achieving efficient resource allocation while keeping the encoding complexity manageable through systematic parameter transformation rather than complex algorithms.
Data Source
AI summary
A cell within cellular network includes user equipment (UE) that transmits data to a base station (eNB). When a UE does not have data to transmit, it may enter a low power mode (DRX) having silent intervals during which the eNB does not expect to receive a transmission from the UE and the UE is not required to monitor DL control channels from the eNB. While in DRX mode, the UE may detect an event, such as data ready for transmission or a need to request a timing adjustment (TA) update. The UE transmits a scheduling request indicator (SRI) to the eNB in response to detection of the event, wherein the SRI carries information identifying the triggering event.