PUCCH Resource Allocation for TDD Wireless Systems
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Solution Overview
Problem
In wireless communication systems, particularly in LTE/LTE-A TDD, there is a challenge in efficiently transmitting reception acknowledgement responses on the EPDCCH to avoid PUCCH resource collisions and waste, especially when large negative HARQ-ACK resource offsets are used.
Innovation Solution
A method and apparatus for a user equipment (UE) to determine PUCCH resources based on the lowest ECCE index of the EPDCCH and HARQ-ACK resource offset (ARO), where the ARO shifts PUCCH resources for subframes, providing different shift amounts depending on the group the subframe belongs to, thereby optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If large negative HARQ-ACK resource offset values are used to avoid excessive PUCCH overhead in TDD when EPDCCH is used, then PUCCH overhead is reduced, but PUCCH resource collisions occur
Solution Approach 1:
The patent segments the PUCCH resource allocation by dividing subframes into different groups (first group, second group, third group) based on their timing relative to the EPDCCH reception subframe. Each group is assigned a different ARO value, which segments the resource offset application and prevents uniform collision while managing overhead efficiently.
Solution Approach 2:
The patent applies different ARO values to different groups of subframes based on their local timing characteristics. The first group (subframes 2-4) receives a first ARO value, the second group (subframes 5-7) receives a second ARO value, and the third group (subframes 8-9) receives a third ARO value. This local differentiation optimizes resource allocation for each subframe group's specific collision risk and overhead requirements.
2Device complexity
If fixed PUCCH resource allocation is used for all subframes, then resource allocation is simple, but resource waste and collisions occur in TDD operations
Solution Approach 1:
The patent introduces dynamic resource allocation by making the ARO value dependent on the subframe index and group assignment. Instead of a fixed offset, the system dynamically determines the appropriate ARO value based on which subframe group the current PUCCH transmission belongs to, optimizing resource usage for each dynamic scenario.
Solution Approach 2:
The patent changes the ARO parameter based on the subframe group classification. By varying the ARO value according to the subframe's position and group assignment, the system adapts the resource offset parameter to prevent both collisions and waste, improving overall resource efficiency without requiring overly complex allocation mechanisms.
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3~4
AI summary
The present invention discloses a method for transmitting a reception acknowledgement response in a wireless communication system. The method includes receiving an enhanced physical downlink control channel (EPDCCH), determining a physical uplink control channel (PUCCH) resource based on a lowest one of enhanced control channel element (ECCE) indexes configuring the EPDCCH and a HARQ-ACK resource offset (ARO), and transmitting a reception acknowledgement response through the PUCCH resource. When a reception acknowledgement response related to two or more subframes is transmitted in a subframe for transmission of the reception acknowledgement response, a set of possible values for the ARO includes a first ARO value to shift a PUCCH resource of a specific subframe to a PUCCH resource region for at least one subframe prior to the specific subframe. The first ARO value provides a different shift amount depending on a group having the specific subframe among groups related to the two or more subframes.