Uplink Precoder Cycling for Semi-Open Loop 5G Diversity
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Solution Overview
Problem
5G networks face challenges in providing reliable transmission diversity for uplink transmissions due to random precoder selection, which can lead to performance degradation and difficulties in Channel Quality Indicator (CQI) estimation, especially since different mobile device chipset vendors may adopt different selection algorithms, and the network cannot guarantee full freedom in transmission parameters.
Innovation Solution
The implementation of a semi-open loop based transmission diversity design that allows mobile devices to randomly select precoders from a candidate set, while ensuring the network has control over the selection to maintain performance and estimate CQI accurately by using precoder cycling and sounding reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mobile devices randomly select precoders for uplink transmissions, then transmission diversity is achieved, but performance degradation occurs and CQI estimation becomes difficult
Solution Approach 1:
The network device pre-configures a candidate set of precoders that the mobile device can randomly select from. This preliminary action ensures that the random selection occurs within controlled boundaries, maintaining both transmission diversity and CQI estimation accuracy. The candidate set is prepared in advance based on network knowledge of channel conditions.
Solution Approach 2:
The system changes the parameter of precoder selection from completely random to semi-random within a configured candidate set. This parameter modification allows the mobile device to maintain randomness for diversity while the network controls the search space to ensure accurate CQI estimation. The candidate set size and composition can be adjusted based on channel conditions.
2Adaptability or versatility
If mobile devices have full freedom in transmission parameters, then transmission flexibility is improved, but network performance cannot be guaranteed
Solution Approach 1:
The precoder selection freedom is segmented into two parts: the mobile device freely selects from a configured candidate set (maintaining flexibility), while the network controls the configuration of this candidate set (ensuring performance). This segmentation allows both adaptability and reliability to coexist.
Solution Approach 2:
The candidate set of precoders acts as an intermediary between complete network control and full device freedom. It provides a controlled search space that enables device autonomy in selection while maintaining network oversight through configuration, thus bridging the gap between flexibility and performance guarantee.
Data Source
AI summary
Facilitating semi-open loop based transmission diversity for uplink transmissions in a communications network is provided herein. A system can comprise a processor and a memory that stores executable instructions that, when executed by the processor, facilitate performance of operations. The operations can comprise receiving, from a network device, information related to a sounding reference resource. The information related to the sounding reference resource can be based on a sounding reference signal resource transmission detected during a defined time interval. The operations can also comprise, based on a selected weight vector cycling, selecting a weight vector from defined weight vectors stored in the memory, resulting in a selected weight vector. Further, the operations can comprise transmitting, to the network device, a signal that comprises the selected weight vector multiplied with the sounding reference signal, during the selected weight vector cycling.