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A method and device for processing uplink frequency offset of a communication system

A communication system and downlink technology, applied in the field of communication, can solve the problems of different Doppler frequency offset and inaccurate frequency offset estimation, and achieve the effect of improving demodulation performance and reducing the pressure of processing

Active Publication Date: 2018-12-14
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to effectively solve the problem of inaccurate frequency offset estimation when the Doppler frequency offset is large in the prior art or only using the frequency offset compensation algorithm in the base station receiver, or by eliminating Doppler in the downlink, Since the moving speeds of different UEs are different, the Doppler frequency offset introduced by them is also different, and the compensation value has a one-to-many problem. The present invention provides a method and device for processing uplink frequency offset in a communication system

Method used

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  • A method and device for processing uplink frequency offset of a communication system
  • A method and device for processing uplink frequency offset of a communication system
  • A method and device for processing uplink frequency offset of a communication system

Examples

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example 1

[0129] Example 1 takes UE0 of N UEs as an example to illustrate the absolute adjustment of uplink frequency offset. Figure 8 It is a flow chart of absolute adjustment in the method for processing the uplink frequency offset of the communication system in Example 1 of the present invention, such as Figure 8 As shown, it specifically includes the following steps:

[0130] UE0 sends PRACH (Physical Random Access Channel) during the random access phase;

[0131] The base station demodulates the PRACH of UE0 to obtain the frequency offset adjustment Δ of UE0 0,0 ;

[0132] The base station adjusts the frequency offset by Δ 0,0 Send it to UE0 through MAC random access response (under MAC RAR).

[0133] UE0 adjusts the initial transmission frequency of the uplink to transmit the uplink subframe signal. For FDD (frequency division duplex system) and TDD (time division duplex system), the initial transmission frequency of the uplink is calculated according to the following formul...

example 2

[0149] Taking UE0 of N UEs as an example, the relative adjustment of uplink frequency offset is described. Figure 9 It is a flow chart of relative adjustment in the method for processing the uplink frequency offset of the communication system in Example 2 of the present invention, as Figure 9 As shown, it specifically includes the following steps:

[0150] UE0 sends PRACH (Physical Random Access Channel) during the random access phase;

[0151] The base station demodulates the PRACH of UE0 to obtain the frequency offset adjustment Δ of UE0 0,0 ;

[0152] The base station adjusts the frequency offset by Δ 0,0 Send it to UE0 through MAC random access response (under MAC RAR).

[0153]UE0 adjusts the initial transmission frequency of the uplink to transmit the uplink subframe signal. For FDD (frequency division duplex system) and TDD (time division duplex system), the initial transmission frequency of the uplink is calculated according to the following formulas.

[0154] ...

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Abstract

The invention provides a method and a device for processing uplink frequency offset of a communication system. The method at a base station side comprises the following steps: demodulating a random access message sent by a terminal, obtaining an initial Doppler frequency offset of the terminal and sending the initial Doppler frequency offset to the terminal; receiving an uplink sub-frame signal sent by the terminal, estimating a Doppler residual frequency offset of the terminal in the uplink, obtaining a frequency adjustment amount according to the Doppler residual frequency offset and transmitting the Doppler residual frequency offset to the terminal. The method on the terminal side comprises the following steps: receiving the initial Doppler frequency offset transmitted by the base station, obtaining the initial transmission frequency of the uplink and transmitting the uplink sub-frame signal according to the initial transmission frequency and the initial Doppler frequency offset ofthe downlink; receiving the frequency adjustment amount transmitted by the receiving base station, and obtaining the transmission frequency of the next uplink according to the frequency adjustment amount. By compensating the uplink at the terminal, the invention reduces the pressure of frequency offset estimation at the base station side to the maximum extent, and can improve the demodulation performance of the base station.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and device for processing uplink frequency deviation of a communication system. Background technique [0002] When the user terminal UE (User Equipment) moves at high speed, the downlink and uplink of wireless communication will introduce frequency offset. The greater the speed, the greater the frequency offset. According to the current communication mechanism between UE and base station, UE Lock the downlink transmission frequency point f of the base station DL , the actual UE is often mobile, considering the impact of Doppler frequency offset, the actual locked downlink transmission frequency of the base station is f DL +Δ, and then use this as a reference to determine the reference frequency point for uplink transmission. [0003] Specifically, for frequency division duplex FDD, its uplink transmission frequency point is f UL =f DL +Δ+β, where Δ is the Doppler fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00
CPCH04L27/0014H04L2027/0026H04L27/00H04W56/0015H04W56/0035H04B7/01H04W72/0446H04W72/0453
Inventor 侯晓辉杨锋卢勤博
Owner ZTE CORP
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