PUCCH Resource Allocation for Legacy and Cat-M1 UEs
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Solution Overview
Problem
The existing LTE networks face design conflicts when supporting both legacy and Category-M1 (Cat-M1) user equipment terminals (UEs) due to differing requirements, leading to inefficient utilization of Physical Uplink Control Channel (PUCCH) resources and potential collisions between legacy and Cat-M1 UEs.
Innovation Solution
The proposed solution involves statically or dynamically allocating PUCCH resources in pairs, where both resources share the same orthogonal code sequence but are located in different resource blocks of adjacent slots, ensuring that either both resources are allocated to legacy UEs or both to Cat-M1 UEs, thereby avoiding collisions and optimizing spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PUCCH resources are allocated separately for legacy UEs and Cat-M1 UEs, then collision avoidance is improved, but resource block utilization efficiency deteriorates
Solution Approach 1:
The patent merges the PUCCH resource allocation for legacy UEs and Cat-M1 UEs into a unified pool of resource blocks. By allowing both UE types to share the same RBs with differentiated resource indices, the system achieves both collision avoidance and high spectral efficiency, resolving the contradiction between reliability and productivity.
Solution Approach 2:
The patent applies local quality by assigning different resource index ranges within the same resource blocks to different UE types. Legacy UEs use even-indexed resources while Cat-M1 UEs use odd-indexed resources, creating localized differentiation within a shared resource pool that maintains both reliability and efficiency.
2Reliability
If frequency switching is implemented in the first slot, then spectral diversity is improved, but compatibility with Cat-M1 UEs deteriorates
Solution Approach 1:
The patent implements dynamic resource allocation where the PUCCH resource index is determined by the CCE index of the scheduling DCI. This dynamic approach allows legacy UEs to benefit from frequency switching in the first slot while Cat-M1 UEs use resources in the second slot, achieving both spectral diversity and multi-UE compatibility.
Solution Approach 2:
The patent performs preliminary action by pre-defining separate resource index ranges for legacy and Cat-M1 UEs based on their respective slot configurations. This preliminary differentiation enables each UE type to operate independently without collision while maintaining overall system compatibility.
3Reliability
If separate resource blocks are allocated to different UE types, then collision avoidance is improved, but the number of available resource blocks increases
Solution Approach 1:
The patent combines resource blocks for different UE types into a unified allocation scheme. By using the same set of RBs with differentiated resource indices (even for legacy, odd for Cat-M1), the system avoids collisions without increasing the total number of resource blocks required, thus resolving the contradiction between reliability and resource quantity.
Data Source
AI summary
A communication system for statically allocating physical uplink control channel (PUCCH) resources on a PUCCH. The communication system includes a base station configured to exchange radio frequency (RF) signals with a plurality of user equipment terminals (UEs). The base station is also configured to identify two PUCCH resources, each sharing the same orthogonal code sequence and located in different resource block of adjacent slots of a subframe. The base station is also configured to statically allocate the two PUCCH resources to two of the UEs, where both UEs are legacy UEs or Category-M1 (Cat-M1) UEs.