Mobile Station HARQ Process Management for Partial Uplink Data Disabling
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Solution Overview
Problem
The unclear operation of mobile station devices when receiving an uplink grant that disables part of the uplink data leads to incorrect Hybrid Automatic Repeat Request (HARQ) performance between the base station and mobile station devices.
Innovation Solution
The mobile station device is configured to receive downlink control information and response information, setting ACK for HARQ processes based on specific transport blocks being disabled, allowing efficient HARQ operation even when part of the uplink data is disabled, by using predetermined numbers and specific fields within the downlink control information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MIMO spatial multiplexing is used to transmit multiple uplink data on the same PUSCH, then the use efficiency of uplink frequency is improved, but the complexity of HARQ process management increases and operation clarity decreases
Solution Approach 1:
The patent segments the uplink data into multiple transport blocks (first uplink data and second uplink data) that are spatially multiplexed on the same PUSCH. Each transport block has its own independent HARQ process, allowing separate ACK/NACK feedback and HARQ buffer management. This segmentation enables efficient utilization of uplink frequency resources while maintaining clear and manageable HARQ operations for each data block.
2Reliability
If independent HARQ processes are implemented for each uplink data, then HARQ performance is improved, but the downlink control information size increases
Solution Approach 1:
The patent merges the control information for multiple transport blocks into a single uplink grant transmitted on the PDCCH. The downlink control information includes resource allocation, modulation and coding scheme, and HARQ process information that applies to both the first and second uplink data. This merging approach maintains independent HARQ processes for each transport block (improving reliability) while avoiding the need for separate downlink control messages for each data block (reducing control information overhead).
Data Source
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AI summary
In a mobile station device capable of transmitting up to a predetermined number of transport blocks to a base station device on a single physical uplink shared channel, an object is to efficiently perform HARQ in case that the mobile station device receives an uplink grant that disables a part of uplink data. The mobile station device receives downlink control information transmitted by the base station device and used for scheduling the physical uplink shared channel. In case that the downlink control information indicates that a specific transport block is disabled, the mobile station device sets ACK for a HARQ process corresponding to the specific transport block.