Nokia Technologies Oy

Shanghai Research Centre for Wireless Communication

Shanghai Research Center for Wireless Communications

Xiumei Yang

Haipeng Lei

Haitao Li

Jing Liu

Kodo Shu

Honglin Hu

Lei Zhu

Huiyue Yi

Shupei Lei

Zhengkun Yi

Yong Xiong

Guoqing Jia

Provided are methods, corresponding apparatuses, and computer program products for performing out-of-band sensing on an unlicensed frequency band. A method comprises sending a configuration message for configuring measurement on at least one channel in a frequency band of a primary system; receiving a measurement report made based upon the configuration message; and determining the usability of the at least one channel based upon the measurement report, wherein the configuration message includes information regarding a respective predetermined threshold of energy detection or primary-system-feature detection, and the measurement report is for reception when a measured energy detection value or a measured primary-system-feature detection value of a received signal on the at least one channel is less than the respective predetermined threshold. With the claimed inventions, the spectrum efficiency would be improved and interference between a secondary system and an LTE system could be alleviated.

Methods, apparatuses, and computer program products for out-of-band sensing in a cognitive LTE system

A robust downlink timing synchronization method for reducing the influence of initial frequency offset and ensuring the timing synchronization in a low signal-to-noise ratio interval in an LTE system, which includes: step 1: a receiving terminal continuously storing time domain signal sequences of M PSS transmission periods; step 2: performing narrowband filtering on the time domain signal sequences of the M PSS transmission periods; step 3: performing down-sampling on data obtained after the filtering; step 4: performing sliding differential mirror correlation on the down-sampling data of an mPSS transmission period to obtain a correlation value of an iinstant; step 5: superposing correlation results to obtain a superposition result; and step 6: determining whether the superposition result has an obvious peak interval; if yes, completing capturing the primary synchronization signal, and obtaining timing information according to a position of a maximum correlation peak; otherwise, returning to step 1.

Robust downlink timing synchronization method in LTE system

Growing community of inventors

Shanghai, China

Xiumei Yang