Full-Power Transmission Codebook Subset Determination

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Solution Overview

Problem

In mobile communications systems, determining a full-power transmission codebook subset after transmission channel switching is challenging, leading to inaccurate scheduling and limited uplink capacity due to the inability of network devices to determine the correct codebook subset without additional signaling overhead.

Innovation Solution

A method that allows network devices to determine a full-power transmission codebook subset for terminal devices by using a specified rule based on the coherence capability of antenna ports before and after antenna port switching, eliminating the need for additional reporting and signaling overhead.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the terminal device reports full-power transmission codebook subset for each frequency band based on existing reporting solution, then the network device can determine the codebook subset before transmission channel switching, but the network device cannot determine the full-power transmission codebook subset after transmission channel switching

Engineering Contradiction:

Improvecodebook subset determination accuracyVSAvoidtransmission channel switching capability

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The terminal device pre-calculates and reports the full-power transmission codebook subset for the target frequency band before transmission channel switching occurs. This preliminary action ensures that the network device has the necessary information to perform accurate scheduling after the switching takes place, without requiring additional real-time signaling.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The solution extends the codebook subset reporting from a single frequency band dimension to multiple frequency bands by including the target frequency band in addition to source frequency bands. This dimensional expansion allows the network device to determine appropriate codebook subsets regardless of which frequency band the terminal switches to.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Measurement precision

If additional signaling overhead is added to report the full-power transmission codebook subset after switching, then the network device can perform accurate scheduling, but the signaling overhead increases

Engineering Contradiction:

Improvescheduling accuracyVSAvoidsignaling overhead

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The full-power transmission codebook subset information for multiple frequency bands (source and target) is merged into a single reporting message. This combination allows the network device to obtain comprehensive scheduling information for all possible frequency bands in one signaling operation, avoiding the need for separate reports and reducing overall signaling overhead.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The terminal device performs preliminary calculation and reporting of the target frequency band's codebook subset before the actual switching occurs. This advance preparation eliminates the need for additional post-switching signaling, as the network device already possesses the necessary information for accurate scheduling after the switch.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If the terminal device uses transmission channel resource pooling solution to flexibly switch to different frequency bands, then the uplink capacity increases, but the network device cannot determine the correct codebook subset without additional signaling

Engineering Contradiction:

Improveuplink capacityVSAvoidcodebook subset determination complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The terminal device calculates and reports the full-power transmission codebook subset for the target frequency band in advance, before transmission channel switching occurs. This preliminary reporting simplifies the network device's task, as it only needs to retrieve the pre-calculated information without performing complex real-time calculations or requiring additional post-switching signaling.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The terminal device autonomously determines and reports its own full-power transmission codebook subset for the target frequency band, without requiring the network device to provide guidance or perform complex coordination. This self-service approach reduces the overall system complexity while enabling flexible transmission channel switching.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS12255711B2Method for determining full-power transmission codebook subset and device

Publication Date: 2025.03.18 HUAWEI TECH CO LTD

AI summary

In a method, a terminal device reports, to a network device, a full-power transmission codebook subset corresponding to a frequency band supported by the terminal device before transmission channel switching. The network device or the terminal device in a communications system may determine, according to a specified rule and full-power transmission codebook subsets corresponding to a plurality of source frequency bands, a full-power transmission codebook subset corresponding to a target frequency band after transmission channel switching. The plurality of source frequency bands are frequency bands in which a plurality of target antenna ports are located before antenna port switching, and the plurality of target antenna ports are antenna ports in the target frequency band after antenna port switching.