Wireless Feedback Bundling for SPS Collision Avoidance
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Solution Overview
Problem
In wireless communication systems, particularly in 5G NR, there is a challenge in efficiently bundling feedback for semi-persistent scheduling (SPS) downlink transmissions due to potential collisions between uplink and downlink communications, leading to inefficiencies in resource utilization and increased latency.
Innovation Solution
The solution involves determining the number of feedback instances to bundle based on the uplink control information format, encoding these instances into feedback bits, and transmitting them in uplink control information, using predefined resources to avoid collisions and optimize resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback instances for multiple SPS downlink transmissions are transmitted separately, then each feedback can be individually acknowledged, but uplink and downlink communications may collide, leading to resource inefficiency and increased latency
Solution Approach 1:
The patent combines multiple feedback instances for SPS downlink transmissions into a single bundled feedback message. Instead of transmitting separate feedback for each SPS transmission, the UE bundles multiple feedback bits together in one uplink transmission, eliminating collisions between individual feedback transmissions and downlink communications while improving resource utilization efficiency.
Solution Approach 2:
The patent establishes predetermined rules and configurations for feedback bundling in advance. The network configures parameters such as the number of feedback instances to bundle, the uplink resource grant timing, and the PUCCH format before SPS transmissions occur. This preliminary configuration ensures that feedback bundling is executed efficiently without requiring real-time decision-making, thereby avoiding collisions and reducing latency.
2Quantity of substance
If the number of feedback bits is increased to cover more SPS instances, then more downlink transmissions can be acknowledged, but the uplink control information payload size increases, requiring more resources
Solution Approach 1:
The patent implements feedback bundling with a configured maximum number of feedback instances per bundle. Instead of bundling all possible SPS feedback instances, the system bundles a predetermined number (e.g., up to 4 instances) that is sufficient for most scenarios. This partial action approach acknowledges that bundling beyond a certain point provides diminishing returns while consuming excessive uplink resources, thus optimizing the balance between feedback coverage and resource efficiency.
3Adaptability or versatility
If feedback bundling is implemented without predetermined rules, then flexibility in handling different scenarios is maintained, but the complexity of determining feedback configuration increases
Solution Approach 1:
The patent uses parameter-based configuration to manage feedback bundling. The network configures specific parameters including the number of feedback instances to bundle (e.g., 2, 4, or 8), the uplink resource grant timing offset, and the PUCCH format type. These parameters can be adjusted based on different deployment scenarios, traffic patterns, and service requirements, providing flexibility while keeping the UE implementation simple through standardized parameter interpretation.
Data Source
AI summary
Aspects described herein relate to receiving, from a base station, an uplink resource grant for transmitting uplink control information, where the uplink resource grant indicates an uplink control information format, bundling a number of instances of feedback in a number of feedback bits, where the number of feedback bits corresponds to the uplink control information format, and where the number of instances of feedback correspond to SPS downlink communications, and transmitting, to the base station and in the uplink control information, the number of feedback bits. Other aspects relate to transmitting the uplink resource grant, and receiving uplink control information based on the indicated uplink control information format.