Uplink Resource Scheduling via Dynamic Indicator
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Solution Overview
Problem
Current scheduling techniques in TDD systems lead to wasteful unused uplink resources due to reserved PUCCH/EPUCCH and PRACH resources not being utilized efficiently, resulting in potential collisions or resource wastage, especially when the demand for uplink subframes is high.
Innovation Solution
Incorporating an indicator in the uplink grant to dynamically modify the resource allocation for specific subframes, allowing exclusion or addition of resources, enabling flexible scheduling and avoiding collisions between PUSCH, PUCCH/EPUCCH, and PRACH transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PUCCH/EPUCCH and PRACH resources are reserved in uplink subframes, then collision avoidance between different uplink channels is ensured, but uplink resource utilization efficiency deteriorates when these reserved resources are not actually needed
Solution Approach 1:
The patent applies dynamics by making the reserved resource configuration changeable through higher layer signaling. The network can dynamically configure whether PUCCH/EPUCCH and PRACH resources are reserved in each uplink subframe based on actual traffic conditions, rather than having fixed reservations. This allows the system to adapt between collision avoidance mode (when reservations are active) and resource utilization mode (when reservations are deactivated), resolving the contradiction between reliability and productivity.
2Device complexity
If a fixed TDD configuration is used, then system simplicity is maintained, but adaptability to varying UL/DL traffic patterns deteriorates
Solution Approach 1:
The patent applies dynamics by introducing dynamic TDD configuration capability where the network can change the TDD pattern in response to traffic conditions. Combined with the dynamic reservation mechanism, this allows the system to transition from fixed to adaptive scheduling while maintaining relative simplicity through network-controlled configuration rather than complex user-side decisions.
Solution Approach 2:
The patent applies parameter changes by modifying the TDD configuration parameters (which subframes are designated for UL or DL) based on traffic patterns. The network can change these parameters dynamically, allowing the system to adapt to varying UL/DL traffic demands while maintaining a structured approach to scheduling that avoids complete complexity.
3Reliability
If resources are reserved for EPUCCH in all uplink subframes, then feedback transmission capability is ensured, but waste of uplink resources increases when EPUCCH is not needed
Solution Approach 1:
The patent applies dynamics by making the EPUCCH resource reservation configurable through higher layer signaling. The network can dynamically decide whether to reserve EPUCCH resources in each uplink subframe based on whether feedback is actually needed, rather than maintaining fixed reservations. This resolves the contradiction by allowing the system to ensure feedback capability when needed while avoiding resource waste when feedback is not required.
Data Source
AI summary
It is disclosed a network node, a communication device and methods therein, for scheduling of uplink resources in multiple time instances and transmitting in accordance with the scheduled UL resources. By including an indicator in an UL grant comprising an UL resource allocation, the indicator indicates that, for at least one UL time instance of the multiple time instances, at least one UL resource is excluded from, or added to, the UL resource allocation of the UL grant.