LAA-LTE Partial Subframe Data Transmission Characteristic Determination
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Solution Overview
Problem
In LTE systems using unlicensed frequency bands, opportunistic data transmission in partial subframes leads to misinterpretation of reference signals, resulting in incorrect radio resource management (RRM) and channel state information (CSI) measurements due to incomplete data sending and receiving.
Innovation Solution
A method for user equipment and access network devices to determine the data transmission characteristics of subframes based on preset conditions, ensuring correct interpretation of reference signals and accurate RRM/CSI measurements by adjusting the downlink data transmission length and including specific synchronization signals within the subframe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If opportunistic data transmission is performed in partial subframes on unlicensed frequency bands, then spectrum utilization efficiency is improved, but reference signal interpretation becomes incorrect leading to inaccurate RRM and CSI measurements
Solution Approach 1:
The patent applies preliminary action by determining the data transmission characteristic of the subframe before performing RRM or CSI measurements. The user equipment identifies whether the subframe is a partial subframe with truncated downlink data based on preset conditions (such as subframe index, presence of specific signals, or duration thresholds), and then adjusts the measurement process accordingly to avoid misinterpretation of reference signals in incomplete subframes
Solution Approach 2:
The patent changes the measurement parameters and interpretation rules based on the identified subframe type. When a partial subframe is detected, the user equipment modifies how reference signals are interpreted and how measurement results are calculated, ensuring accurate RRM and CSI measurements even in truncated subframes by adapting the measurement methodology to the actual data transmission characteristics
2Measurement precision
If complete subframes are used for data transmission, then accurate RRM and CSI measurements can be performed, but spectrum utilization efficiency decreases due to inability to exploit partial subframe opportunities
Solution Approach 1:
The patent applies dynamics by making the measurement process adaptive rather than static. The user equipment dynamically identifies partial subframes based on preset conditions and dynamically adjusts the measurement approach accordingly. This allows the system to flexibly handle both complete and partial subframes, capturing spectrum opportunities while maintaining measurement accuracy through condition-based measurement strategies
3Productivity
If downlink data transmission length is reduced in partial subframes, then more frequent transmission opportunities are available, but data transmission completeness is compromised leading to measurement errors
Solution Approach 1:
The patent changes the interpretation parameters of reference signals based on the actual transmission completeness. When downlink data transmission is truncated in a partial subframe, the user equipment identifies this condition through preset criteria and adjusts the parameter interpretation for reference signals accordingly, ensuring reliable measurement results even when transmission completeness is compromised
Solution Approach 2:
The patent performs preliminary identification of partial subframes before measurements are taken. By determining the data transmission characteristic in advance based on preset conditions (such as subframe duration, presence of specific signal elements, or timing relationships), the system prepares the appropriate measurement strategy beforehand, preventing measurement errors that would result from treating incomplete transmissions as complete
Data Source
AI summary
The present disclosure relates to example data transmission methods, user equipment, and access network devices in an LAA-LTE system. An example data receiving method includes determining, by user equipment, first information of a first cell. The user equipment determines a first subframe based on the first information, where a downlink data transmission length of the first subframe is less than a first threshold. The user equipment then determines a data transmission characteristic of the cell in the first subframe based on a preset condition, so as to receive, based on the data transmission characteristic, data including the first subframe. In doing so, a data transmission characteristic of a base station or a terminal is standardized, and a reference signal such as a DRS can be correctly identified.