MTC UE HARQ-ACK PUSCH Timing Configuration
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Solution Overview
Problem
Current wireless communication systems face challenges in configuring an efficient timing relationship between HARQ-ACK and PUSCH channels, particularly for machine-type communication user equipment (MTC UE) in scenarios requiring coverage enhancement, where channel collisions and inefficient scheduling occur, leading to difficulties in supporting multiple UEs and maintaining low data rate and battery efficiency.
Innovation Solution
A method and apparatus for configuring the timing relationship between HARQ-ACK and PUSCH channels by transmitting multiple uplink grants and receiving data from multiple UEs, with a base station using a group-common PHICH response, allowing flexible scheduling and reducing collisions between channels, enabling simultaneous DL and UL scheduling and improved multiplexing of UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current timing relationship between HARQ-ACK and PUSCH is used for MTC UE with coverage enhancement, then channel collisions occur and scheduling efficiency decreases, but modifying the timing relationship increases device complexity and scheduling flexibility requirements
Solution Approach 1:
The patent modifies the timing relationship parameter k between PHICH and PUSCH channels. Specifically, it sets k to be greater than or equal to 4 subframes, changing the default timing parameter to avoid channel collisions while maintaining coverage enhancement benefits for MTC UEs
Solution Approach 2:
The patent introduces dynamic timing adjustment mechanisms where the base station can flexibly configure the timing relationship between PHICH and PUSCH channels based on current system conditions, allowing adaptive optimization of scheduling efficiency while managing device complexity
2Productivity
If multiple UEs are scheduled simultaneously in MTC scenario, then resource utilization improves, but channel collisions between HARQ-ACK and PUSCH increase
Solution Approach 1:
The patent resolves channel collisions by introducing a time-domain dimension solution. It schedules HARQ-ACK and PUSCH channels in different time slots (subframes) by adjusting the timing relationship k, effectively separating overlapping channels in the time dimension to enable simultaneous scheduling of multiple UEs without collisions
3Area of stationary object
If coverage enhancement is applied to MTC UEs in extreme scenarios, then coverage area expands, but data rate decreases and delay increases
Solution Approach 1:
The patent employs periodic repetition of transmissions for MTC UEs in extreme coverage scenarios. By repeating data transmissions and acknowledgments over multiple subframes with optimized timing relationships, the system extends coverage to difficult-to-reach areas while managing the inherent trade-off of reduced data rate and increased latency
Data Source
AI summary
A method and apparatus for transmitting a physical HARQ indicator channel (PHICH) in a wireless communication system is provided. A base station (BS) transmits multiple uplink (UL) grants for multiple user equipments (UEs), receives UL data from the multiple UEs, and transmits a group-common PHICH as a response to the UL data received from the multiple UEs.