SPS Grant Update via Group Control Channel
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Solution Overview
Problem
In wireless communication systems, especially in dense environments like factory automation, semi-persistent scheduling (SPS) grants for resource allocation can be unreliable due to changing channel conditions, leading to inefficiencies and failures in message decoding, particularly when multiple UEs operate under different channel conditions.
Innovation Solution
The implementation of updates to SPS grants within group control messages allows for dynamic resource allocation adjustments based on feedback reports, ensuring that UEs receive the necessary resources for reliable transmission, even under changing channel conditions, by transmitting additional resources in a group downlink control message.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If semi-persistent scheduling (SPS) grants are used for resource allocation, then resource allocation efficiency is improved, but reliability of message decoding deteriorates under changing channel conditions
Solution Approach 1:
The patent applies dynamics by enabling the SPS grant to be updated dynamically through group control channel messages. The base station can modify resource allocations in response to changing channel conditions, transforming the static SPS mechanism into a dynamic one that adapts to environmental changes while maintaining scheduling efficiency.
Solution Approach 2:
The patent implements feedback mechanisms where UEs report channel quality indicators (CQI) and the base station uses this feedback to adjust resource allocations in subsequent group control channel messages. This closed-loop feedback system ensures that resource allocations remain reliable under varying channel conditions while preserving the efficiency benefits of SPS.
2Reliability
If individual resource allocations are sent to each UE, then reliability of resource allocation is improved, but signaling overhead increases
Solution Approach 1:
The patent merges individual resource allocation messages into a single group control channel message that serves multiple UEs simultaneously. By combining allocation information for multiple UEs into one message and using group-specific radio network temporary identifiers (RNTIs), the system maintains reliable resource allocation while significantly reducing signaling overhead compared to individual messages.
Solution Approach 2:
The group control channel message serves multiple functions: it provides resource allocations to multiple UEs, conveys channel condition information, and enables dynamic updates to SPS grants. This multi-functional approach reduces the need for separate signaling messages while maintaining allocation reliability across multiple UEs.
3Loss of information
If group control messages are used for resource allocation, then signaling overhead is reduced, but adaptability to individual UE channel conditions deteriorates
Solution Approach 1:
The patent segments the group control channel message into UE-specific portions identified by group-specific RNTIs. Each UE can selectively decode the portion relevant to it, allowing the system to maintain low signaling overhead while providing customized resource allocations adapted to each UE's specific channel conditions through targeted feedback mechanisms.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A wireless device may receive a semi-persistent scheduling (SPS) grant of initial resources for receiving a transmission, receive, in a group control channel, a resource allocation for additional resources for receiving the transmission, determine resources for receiving the transmission based on the resource allocation and the SPS grant, and receive the transmission on the determined resources. A base station may transmit a SPS grant for scheduling a transmission on a set of resources, receive a feedback report from a user equipment (UE) indicating the UE requires additional resources for receiving the transmission, generate, based at least on the UE requiring the additional resources, a resource allocation for scheduling the additional resources for the UE, transmit the resource allocation in a group control channel, and transmit the transmission on the set of resources and the additional resources.