PHICH Resource Allocation Using Layer-Specific Offset Values
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Solution Overview
Problem
In LTE-A systems, uplink single-user MIMO transmission leads to collisions of PHICH resources due to the multiplexing of signals across multiple layers, which existing methods attempt to address by varying CS values or resource block indices, but these solutions increase control signal overhead.
Innovation Solution
A base station apparatus and mobile terminal apparatus configuration that uses fixedly defined offset values to allocate response signals for transport blocks, preventing PHICH resource collisions without increasing control signal overhead by determining PHICH resources using pre-defined offset values for each transport block.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink single-user MIMO transmission is implemented to improve uplink spectral efficiency, then data transmission capacity is improved, but PHICH resource collisions occur due to multiplexing of signals across multiple layers
Solution Approach 1:
The patent segments the PHICH resource allocation by introducing layer-specific offset values for each transport block. Instead of using a single shared PHICH resource for multiple layers, the system divides the resource allocation space by applying different offset values (e.g., phich-OFFSET-0 for layer 0, phich-OFFSET-1 for layer 1) to each layer's PHICH resource determination, thereby preventing collisions while maintaining MIMO functionality
Solution Approach 2:
The patent applies local quality by making PHICH resource allocation layer-specific rather than uniform. Each transport block associated with a specific layer uses its own offset value to determine PHICH resources, allowing the system to tailor the resource allocation characteristics to each layer's needs and prevent inter-layer collisions
2Reliability
If existing methods vary CS values or resource block indices to address PHICH collisions, then resource allocation conflicts are reduced, but control signal overhead increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring offset values (phich-OFFSET-0, phich-OFFSET-1, etc.) for each transport block before communication begins. These offset values are fixedly defined in advance between the base station and mobile terminal, eliminating the need for dynamic control signaling during operation to resolve PHICH collisions
Solution Approach 2:
The system uses self-service by having the mobile terminal autonomously determine its PHICH resources using the pre-configured offset values corresponding to its transmitted layer. The terminal independently calculates the appropriate PHICH resource index by applying its layer-specific offset to the resource determination formula, without requiring additional base station commands or control signals
Data Source
AI summary
The present invention provides a base station apparatus, a mobile terminal apparatus and a communication control method that can adequately allocate resources of response signals for retransmission for spatially-multiplexed signals respectively corresponding to a plurality of layers via the uplink and that support next-generation mobile communication systems. Discloses is a configuration to receive signals in which a plurality of layers are spatially-multiplexed on the uplink from a mobile terminal apparatus (10), generate HARQ ACK/NACK for signals received in the layers on the uplink, and allocate HARQ ACK/NACK for transport blocks associated with the layers, to PHICH resources, using the offset values that are fixedly defined in advance with the mobile terminal apparatus (10) for every uplink layer.