Dynamic PUCCH Repetition Factor Indication via CCE Location
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing the physical uplink control channel (PUCCH) repetition factor, particularly at the cell edge or with limited uplink transmit power, leading to poor performance.
Innovation Solution
The method involves indicating a PUCCH repetition factor through the location of a control channel element (CCE) and PUCCH resource indicator bitfield of the physical downlink control channel (PDCCH), as well as parameters of the PDCCH or physical downlink shared channel (PDSCH), to dynamically configure the number of PUCCH transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the PUCCH repetition factor is increased to improve reliability at cell edge or with limited transmit power, then the robustness of PUCCH transmission is improved, but the latency and energy consumption increase due to multiple repetitions
Solution Approach 1:
The PUCCH repetition factor is made dynamic rather than fixed, allowing the system to adapt the number of repetitions based on current channel conditions, UE location, and power constraints. The base station can adjust the repetition factor via DCI signaling to optimize between reliability and latency for each transmission instance.
Solution Approach 2:
The system changes the repetition factor parameter based on operating conditions. Different repetition factors are selected depending on whether the UE is at cell edge, available transmit power, and channel quality, allowing optimization of the trade-off between reliability improvement and latency penalty.
2Reliability
If the PUCCH repetition factor is increased to enhance reliability, then the performance in poor channel conditions is improved, but the energy consumption increases due to multiple transmissions
Solution Approach 1:
The repetition factor is dynamically adjusted based on available uplink transmit power and channel conditions. When power is limited, the system can reduce the repetition factor to conserve energy while maintaining adequate reliability through other means such as power boosting or more robust modulation.
Solution Approach 2:
The system changes operational parameters including repetition factor and transmit power based on battery status and power constraints, allowing flexible trade-offs between energy consumption and transmission reliability for power-limited UEs.
3Adaptability or versatility
If the PRI bitfield and DCI format are modified to indicate larger numbers of PUCCH repetition factors, then the versatility and range of repetition options are improved, but the device complexity and signaling overhead increase
Solution Approach 1:
Instead of increasing the size of the PRI bitfield (one dimension), the patent uses existing DCI fields and combines multiple parameters to indicate the repetition factor. This approach uses another dimension (combinatorial encoding) to achieve the same goal without increasing bitfield size or complexity.
Solution Approach 2:
Existing DCI fields are made multi-functional, serving both their original purposes and additionally indicating the PUCCH repetition factor. This universal use of existing signaling elements avoids the need for separate dedicated fields, maintaining signaling efficiency while providing enhanced functionality.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a physical downlink control channel (PDCCH) scheduling a physical downlink shared channel (PDSCH). The UE may transmit a physical uplink control channel (PUCCH) based on a PUCCH repetition factor, wherein the PUCCH repetition factor is indicated by a location of a control channel element (CCE) of the PDCCH, a PUCCH resource indicator (PRI) bitfield of the PDCCH, and at least one of: one or more parameters of the PDCCH, or one or more parameters of the PDSCH. Numerous other aspects are provided.