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Method and device for transmitting data on unlicensed frequency range

A technology of data transmission and frequency band, which is applied in the directions of digital transmission system, transmission system, and multiple use of transmission paths, which can solve the problems of uncertainty of interference level and difficulty in guaranteeing the quality of LTE transmission services.

Inactive Publication Date: 2015-11-25
BEIJING SAMSUNG TELECOM R&D CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, in the license-free frequency band, the interference level is uncertain, which makes it difficult to guarantee the quality of service (QoS) of LTE transmission, but the license-free frequency band can still be used for data transmission with low QoS requirements

Method used

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  • Method and device for transmitting data on unlicensed frequency range
  • Method and device for transmitting data on unlicensed frequency range
  • Method and device for transmitting data on unlicensed frequency range

Examples

Experimental program
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Effect test

Embodiment 1

[0106] The 802.11 system works based on the carrier sense multiple access / collision avoidance (CSMA / CA) mechanism. A mobile station (STA) must detect the wireless channel before sending a signal. Only when the wireless channel is idle and remains for a certain period of time , the STA can occupy the wireless channel to send signals. Here, the STA may jointly use two sets of mechanisms to jointly determine the wireless channel state. On the one hand, STAs can use carrier sense technology to actually measure wireless channels. When detecting signals from other STAs or signal power exceeds a certain threshold, the STA considers the wireless channel to be busy; on the other hand, the 802.11 specification also introduces a virtual Carrier sensing technology, that is, Network Allocation Vector (NAV), contains a duration field in each 802.11 frame, and sets the value of NAV according to the duration field. NAV indicates the time when a wireless channel needs to be reserved, that is, ...

Embodiment 2

[0118] The 802.11 system works based on the CSMA / CA mechanism. A STA must detect the wireless channel before sending a signal, and only when the wireless channel is idle for a certain period of time, the STA can occupy the wireless channel to send signals. Such as Figure 6 Shown is a schematic diagram of the structure of the protocol data packet of the Physical Layer Convergence Protocol (PLCP) of WiFi. In chronological order, a physical layer transmission data packet is composed of PLCP preamble, PLCP header and WiFi data. in:

[0119] The PLCP preamble is used for timing synchronization, etc.

[0120] The PLCP header contains some control information for decoding WiFi data, in particular, it contains the encoding rate (RATE) and length (LENGTH). RATE indicates the transmission rate of the data part, and LENGTH indicates the number of bytes contained in the physical layer service data unit (PSDU). According to RATE and LENGTH, the time that WiFi data transmission needs to ...

Embodiment 3

[0126] On the unlicensed frequency band, the LTE-U system can work in a way of discontinuously occupying wireless channels. That is, the LTE-U system reserves a wireless channel for a period of time when there is a business demand, and calculates the length of time for which the wireless channel needs to be reserved according to the traffic demand, so that the LTE-U transmission during this time period can not be affected by WiFi ; After the reserved time expires, the LTE-U stops transmitting signals on the wireless channel until the next time the wireless channel is reserved. Here, when the wireless channel needs to be occupied, the LTE-U system can first detect the state of the wireless channel, and when the wireless channel is idle, use the method of embodiment 1 or embodiment 2 to reserve the wireless channel to prevent mutual interference with the WiFi system . Between two LTE-U reserved wireless channel operations, there may be a period of time not used for LTE-U transm...

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Abstract

The present invention provides a method for data transmission on an unlicensed band, comprising the steps of: receiving, by UE, configuration information, the configuration information configuring a cell where the UE works on an unlicensed band; and, receiving, by the UE, control information, and performing data transmission on the unlicensed band according to the control information. The present application further discloses a method for data transmission on an unlicensed band, UE and a base station. By the technical solutions provided by the present invention, a wireless channel can be reserved for the data transmission of UE on an unlicensed band, and the data transmission of the UE on the unlicensed band and the frequency occupation of a WiFi system are coordinated, so that the mutual interference between the data transmission of the UE on the unlicensed band and the WiFi system is avoided.

Description

technical field [0001] The present invention relates to a wireless communication system, and more specifically relates to a method and device for data transmission based on a long-term evolution (LTE) system in an unlicensed frequency band (UnlicensedBand). Background technique [0002] The Long Term Evolution (LTE) system of the 3GPP standardization organization supports two duplex modes of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). Such as figure 1 As shown, for the FDD system, the length of each radio frame is 10ms, including 10 subframes with a length of 1ms, which are composed of two consecutive time slots with a length of 0.5ms, that is, the kth subframe includes time slots 2k and Time slot 2k+1,. Such as figure 2 As shown, for the TDD system, each 10ms radio frame is equally divided into two half-frames with a length of 5ms. Each half-frame contains 8 time slots with a length of 0.5ms and 3 special domains, namely downlink pilot time slot (Dw...

Claims

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Application Information

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IPC IPC(8): H04W16/14H04W74/08
CPCH04W74/08H04L5/0053H04L5/0096H04W72/23H04L27/2601H04W72/0446H04W84/12
Inventor 李迎阳孙程君
Owner BEIJING SAMSUNG TELECOM R&D CENT
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