WO2017107197A1 - 一种lte系统中的上行接入方法、装置和基站 - Google Patents

一种lte系统中的上行接入方法、装置和基站 Download PDF

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WO2017107197A1
WO2017107197A1 PCT/CN2015/098981 CN2015098981W WO2017107197A1 WO 2017107197 A1 WO2017107197 A1 WO 2017107197A1 CN 2015098981 W CN2015098981 W CN 2015098981W WO 2017107197 A1 WO2017107197 A1 WO 2017107197A1
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base station
sampling window
prach
stage sampling
bit
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French (fr)
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鲁志兵
胡军
张庆利
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Hytera Communications Corp Ltd
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Hytera Communications Corp Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access

Definitions

  • the present invention relates to the field of LTE communication technologies, and in particular, to an uplink access method, apparatus, and base station in an LTE system.
  • LTE Long Term Evolution
  • UMTS Universal Mobile Telecommunications System
  • 3GPP The 3rd Generation Partnership Project
  • the physical random access channel PRACH designed by the standard LTE can support a maximum coverage distance of 100 km.
  • the base station is required to support longer coverage distances to reduce the cost of the network.
  • the present invention provides an uplink access method, apparatus, and system in an LTE system, which implements a coverage distance of a base station greater than 100 km.
  • An embodiment of the present invention provides an uplink access method in an LTE system, where the method includes:
  • the base station uses a multi-stage sampling window to respectively receive the physical random access channel PRACH of the terminal UEs from different coverage areas, wherein the multi-stage sampling window includes the number of stages as the maximum coverage radius of the base station increases stepwise Also increase;
  • the base station After performing the PRACH detection on the PRACH, the base station determines a timing advance TA of the UE that sends the PRACH;
  • the base station sends the TA to the UE, so that the UE adjusts an uplink transmission time according to the TA.
  • the base station separately receives PRACHs of UEs from different coverage areas by using multi-stage sampling windows, including:
  • the base station presets a multi-stage sampling window, and the multi-stage sampling window includes at least a first-stage sampling window and a second stage sampling window, wherein the second stage sampling window is delayed by a preset time period from a start time of the first stage sampling window;
  • the base station uses the first level sampling window and the second level sampling window to respectively receive PRACHs of UEs from different coverage areas.
  • the method further includes:
  • the base station When the base station performs resource allocation for the UE, the base station blanks the resource of the preset length after the guard interval GT of the PRACH.
  • the preset length is proportional to a maximum coverage radius of the base station.
  • the sending, by the base station, the TA to the UE includes:
  • the base station When the distance between the UE and the base station is not more than 160 km, the base station sends the TA that is carried by the 11 bit to the UE;
  • the base station When the distance between the UE and the base station is greater than 160 km, the base station sends the TA that is carried by the 12-bit to the UE, where the 12-bit includes a 1-bit reserved by the protocol.
  • the present invention also provides an uplink access device in an LTE system, where the device includes:
  • a receiving module configured to receive, by using a multi-stage sampling window, a physical random access channel PRACH of a terminal UE from different coverage areas, where the multi-stage sampling window increases with a stepwise increase of a maximum coverage radius of the base station The number of stages included has also increased;
  • a determining module configured to perform a PRACH detection on the PRACH, and determine a timing advance TA of the UE that sends the PRACH;
  • a sending module configured to send the TA to the UE, so that the UE adjusts an uplink transmission time according to the TA.
  • the receiving module includes:
  • a sub-module configured to preset a multi-stage sampling window, where the multi-stage sampling window includes at least a first-stage sampling window and a second-level sampling window, wherein the second-stage sampling window is larger than the first-stage sampling window
  • the start time is delayed by a preset time period
  • a receiving submodule configured to receive, by using the first level sampling window and the second level sampling window, PRACHs of UEs from different coverage areas.
  • the device further comprises:
  • An allocation module configured to: when the resource allocation is performed for the UE, the guard interval of the PRACH The resource of the preset length after the GT is blanked.
  • the preset length is proportional to a maximum coverage radius of the base station.
  • the sending module includes:
  • a first sending submodule configured to: when the distance between the UE and the base station is not more than 160 km, send the TA that is carried by the 11 bit to the UE;
  • a second sending submodule configured to: when the distance between the UE and the base station is greater than 160 km, send the TA that is carried by the 12 bit to the UE, where the 12 bit includes a 1 bit reserved by the protocol.
  • the present invention also provides an uplink access base station in an LTE system, where the base station includes a memory and a processor.
  • the memory is configured to store program code and transmit the program code to the processor
  • the processor is configured to: according to an instruction in the program code, use a multi-stage sampling window to respectively receive a physical random access channel PRACH of a terminal UE from different coverage areas, wherein, according to the maximum of the base station a stepwise increase in coverage radius, the number of stages included in the multi-stage sampling window is also increased; after performing PRACH detection on the PRACH, determining a timing advance TA of the UE transmitting the PRACH; sending the TA to the UE, so that the UE adjusts an uplink transmission time according to the TA.
  • the processor is specifically configured to preset a multi-stage sampling window, where the multi-stage sampling window includes at least a first-stage sampling window and a second-stage sampling window, and the second-stage sampling window is more than the first
  • the start time of the primary sampling window is delayed by a preset time period; and the first stage sampling window and the second level sampling window are used to respectively receive PRACHs of UEs from different coverage areas.
  • the processor is further configured to: when the resource allocation is performed for the UE, blank a resource of a preset length after the guard interval GT of the PRACH.
  • the processor is configured to: when the distance between the UE and the base station is not more than 160 km, send the TA that is carried by the 11 bit to the UE; when the distance between the UE and the base station is greater than At 160 km, the TA that is carried by the 12-bit is sent to the UE, where the 12-bit includes 1 bit reserved by the protocol.
  • the base station separately receives the PRACHs of the terminal UEs from different coverage areas by using the multi-stage sampling window, and the multi-stage sampling window includes the number of stages and the maximum coverage of the base station. The radius is proportional.
  • the base station determines a timing advance TA of the UE that sends the PRACH.
  • the base station will be The TA is sent to the UE, so that the UE adjusts the uplink transmission time according to the TA.
  • the present invention utilizes a multi-stage sampling window to implement hierarchical sampling of UEs of different distance ranges, and more accurately implement uplink access of UEs with a base station greater than 100 km in the LTE system.
  • FIG. 1 is a flowchart of an uplink access method in an LTE system according to an embodiment of the present disclosure
  • FIG. 2 is a schematic diagram of a base station using a multi-stage sampling window to collect a PRACH sequence of a UE from a different distance from the base station according to an embodiment of the present disclosure
  • FIG. 3 is a schematic diagram of a frame format of a 12-bit bearer TA according to an embodiment of the present disclosure
  • FIG. 4 is a schematic structural diagram of an uplink access device in an LTE system according to an embodiment of the present disclosure
  • FIG. 5 is a schematic structural diagram of an uplink access base station in an LTE system according to an embodiment of the present invention.
  • a base station of a standard LTE design can support a maximum coverage distance of 100 km.
  • the uplink access method provided by the embodiment of the present invention uses the multi-stage sampling window to implement hierarchical sampling of UEs in different distance ranges, and realizes that the distance base station is greater than 100 km in the LTE system.
  • Uplink access of the UE In addition, in the embodiment of the present invention, the base station allocates resources of the preset length of the GT of the PRACH to any resource allocation.
  • the UE implements the extension of the PRACH, so that the extended PRACH can support the uplink access of the UE with a distance greater than 100 km.
  • the terminal may be a walkie-talkie, but is not limited thereto.
  • FIG. 1 is a flowchart of an uplink access method in an LTE system according to an embodiment of the present disclosure, where the method includes:
  • the base station uses a multi-stage sampling window to respectively receive PRACHs of terminal UEs from different coverage areas, wherein the multi-stage sampling window includes a number of stages also increases as the maximum coverage radius of the base station increases stepwise.
  • the base station After performing the PRACH detection on the PRACH, the base station determines a timing advance TA of the UE that sends the PRACH.
  • the base station sends the TA to the UE, so that the UE adjusts an uplink transmission time according to the TA.
  • the guard interval GT of the PRACH is to avoid collision between the Preamble that arrives at the late base station and the next uplink subframe.
  • the terminal in order to achieve super-long-distance coverage of the base station, the terminal that is more than 100 km away from the base station and even more than 160 km can successfully access the base station. Therefore, the base station in the embodiment of the present invention performs PRACH when performing resource allocation for the terminal.
  • the resource of the preset length after the guard interval GT is blanked, thereby extending the length of the GT to form an extended PRACH.
  • the preset length that is blanked is proportional to the maximum coverage radius of the base station.
  • the base station since the distance of the terminal in the super long-distance coverage scenario of the LTE system from the base station may exceed 100 km or even exceed 160 km, the base station cannot accurately collect the sampling window by using the sampling window currently used for acquiring the terminal within 100 km.
  • the embodiment of the present invention uses a multi-stage sampling window to separately collect PRACHs transmitted by UEs in different coverage areas.
  • the number of stages of the sampling window that the base station has is generally proportional to the maximum coverage radius of the base station.
  • the maximum coverage radius of the base station increases stepwise, the number of stages included in the multi-stage sampling window also increases.
  • the The number of stages included in the multi-stage sampling window is constant, and the number of stages included in the multi-stage sampling window is increased by one level only when the maximum coverage radius of the base station is increased to the next step.
  • an increase in the maximum coverage radius of the base station in one step means that the maximum coverage radius of the base station is between 1-100 km, or between 100 km-200 km.
  • the increase of the maximum coverage radius of the base station to the next step means that the maximum coverage radius of the base station varies from 1-100 km to 100 km-200 km.
  • the base station may collect the terminals according to the distance from the base station to the sampling windows of different levels. For example, using a first-stage sampling window to collect a terminal that is 0-100 km away from the base station, and using a second-stage sampling window to collect a terminal that is 100 km-200 km away from the base station, and so on, to implement different levels of sampling window pairs. Acquisition of terminals with different coverage areas.
  • the second sampling window is delayed by a preset time period from the start time of the first sampling window, and so on, and the latter sampling window has a delay compared with the starting time of the previous sampling window. .
  • the second-stage sampling window for collecting 100 km-200 km from the base station has a start time delay of 0.67 ms for collecting the first-stage sampling window from the base station 0-100 km.
  • a schematic diagram of a base station using a multi-stage sampling window to collect PRACH sequences from UEs at different distances from the base station is provided.
  • the first sampling window is used to collect the PRACH sequence from the terminal of 0-100 km
  • the second sampling window is used to collect the PRACH sequence from the terminal of 100 km-200 km. Since the CP part is the data cyclically shifted after the PRACH, the first sampling window can collect the complete data of the PRACH sequence from the 0-100km terminal, and the second sampling window can collect the terminal from the 100km-200km terminal. Complete data for the PRACH sequence, and so on.
  • the base station determines the timing advance TA of different terminals by performing PRACH detection on the collected PRACHs from different terminals.
  • the time advance TA corresponding to the terminal farther from the base station is longer.
  • there are many methods for the base station to perform PRACH detection on the PRACH and details are not described herein again.
  • the TA is sent to the corresponding terminal, so that each terminal can adjust its own uplink transmission time according to the respective received TA.
  • the terminal of the terminal that is far away from the base station is long, and the terminal needs to transmit uplink data for a long time in advance.
  • the base station separately receives PRACHs of UEs from different coverage areas by using multi-stage sampling windows, and the level included in the multi-stage sampling window is included. The number is proportional to the maximum coverage radius of the base station.
  • the base station determines a timing advance TA of the UE that sends the PRACH.
  • the base station sends the TA to the UE, so that the UE adjusts an uplink transmission time according to the TA.
  • the embodiment of the present invention utilizes a multi-stage sampling window to implement hierarchical sampling of UEs in different distance ranges, and more accurately implement uplink access of a UE with a base station greater than 100 km in an LTE system, thereby enabling the base station to support a longer coverage distance to reduce Distribution cost.
  • the base station can be supported to cover the distance of 160 km.
  • the embodiment of the present invention in order to enable the value of the TA to support the base station to achieve a longer-distance coverage, the embodiment of the present invention also uses a bit reserved by the current protocol in the frame structure to carry the TA, that is, the embodiment of the present invention can utilize
  • the 12-bit carries the TA, so that the TA value at this time can support the base station to achieve coverage over a longer distance, and in fact can support the base station to achieve a coverage distance of 320 km as far as possible.
  • FIG. 3 is a schematic diagram of a frame format of a 12-bit bearer TA according to an embodiment of the present invention, where R is a bit reserved by the current protocol, and an embodiment of the present invention utilizes a bit of R and an original 11 bit.
  • the Timing Advance Command jointly carries the TA, so that the TA value that can be carried is larger, thereby supporting the base station to achieve a coverage distance of 320 km as far as possible.
  • the base station before transmitting a TA to each UE, the base station first determines whether the distance between the UE and the base station has been checked for 160 km. When the distance between the UE and the base station is not more than 160 km, the base station sends the TA that is carried by the 11 bit to the UE; when the distance between the UE and the base station is greater than 160 km, the base station shall be 12 bits.
  • the bearer is sent to the UE, where the 12 bits include a 1 bit reserved by the protocol.
  • the ultra-long-distance coverage of the base station is achieved by extending the frame structure of the bearer TA.
  • An embodiment of the present invention further provides an uplink access device in an LTE system.
  • FIG. 4 it is a schematic structural diagram of an uplink access device in an LTE system according to an embodiment of the present disclosure, where the device includes:
  • the receiving module 401 is configured to receive terminals from different coverage areas by using multi-level sampling windows a PRACH of the UE, wherein the multi-stage sampling window includes a number of stages as the maximum coverage radius of the base station increases stepwise;
  • the determining module 402 is configured to: after performing PRACH detection on the PRACH, determine a timing advance TA of the UE that sends the PRACH;
  • the sending module 403 is configured to send the TA to the UE, so that the UE adjusts an uplink transmission time according to the TA.
  • the embodiment of the present invention in order to achieve the ultra-long-distance coverage of the base station, the terminal that is more than 100 km away from the base station and even more than 160 km can successfully access the base station. Therefore, the embodiment of the present invention uses the multi-stage sampling window to implement UEs in different distance ranges. Hierarchical sampling, more accurate implementation of uplink access of UEs in the LTE system that are greater than 100 km from the base station.
  • the receiving module 401 may include:
  • a sub-module configured to preset a multi-stage sampling window, where the multi-stage sampling window includes at least a first-stage sampling window and a second-level sampling window, wherein the second-stage sampling window is larger than the first-stage sampling window
  • the start time is delayed by a preset time period
  • a receiving submodule configured to receive, by using the first level sampling window and the second level sampling window, the PRACHs of UEs from different coverage areas.
  • the device may further include:
  • an allocating module configured to blank a resource of a preset length after the guard interval GT of the PRACH when performing resource allocation for the UE.
  • the preset length is proportional to a maximum coverage radius of the base station.
  • the embodiment of the present invention extends the frame structure of the bearer TA.
  • the TA can be carried by using 12 bits, where the 12 bits include 1 bit reserved by the protocol.
  • the sending module may include:
  • a first sending submodule configured to: when the distance between the UE and the base station is not more than 160 km, send the TA that is carried by the 11 bit to the UE;
  • a second sending submodule configured to: when the distance between the UE and the base station is greater than 160 km, send the TA that is carried by the 12 bit to the UE, where the 12 bit includes a 1 bit reserved by the protocol.
  • the uplink access device in the LTE system can implement the following functions: receiving, by using a multi-stage sampling window, the extended PRACHs of UEs from different coverage ranges, and the multi-level sampling window includes a number of stages and The maximum coverage radius of the base station is proportional. After performing PRACH detection on the extended PRACH, determining a timing advance TA of the UE that transmits the extended PRACH. Transmitting the TA to the UE, so that the UE adjusts an uplink transmission time according to the TA.
  • the embodiment of the present invention utilizes a multi-stage sampling window to implement hierarchical sampling of UEs in different distance ranges, and more accurately implement uplink access of a UE with a base station greater than 100 km in the LTE system.
  • the embodiment of the present invention can support the base station to achieve a longer coverage distance by extending the frame structure of the bearer TA and using the 12-bit bearer TA.
  • the present invention further provides a structure diagram of an uplink access base station in an LTE system, as shown in FIG. 5, wherein the base station includes at least one memory 501 and at least one processor 502, and further includes at least one network interface 503;
  • the memory 501, the processor 502, and the network interface 503 are connected to each other by a bus.
  • the memory 501 is for storing program code and transmitting the program code to the processor 502.
  • the processor 502 is configured to, according to the instruction in the program code, perform the following steps: respectively, using a multi-stage sampling window, respectively receiving PRACHs of terminal UEs from different coverage ranges, wherein a stepwise manner with a maximum coverage radius of the base station Increasing, the number of stages included in the multi-stage sampling window is also increased; after performing PRACH detection on the PRACH, determining a timing advance TA of a UE that sends the PRACH; and sending the TA to the UE, so that The UE adjusts the uplink transmission time according to the TA.
  • the processor 502 presets a multi-stage sampling window, where the multi-stage sampling window includes at least a first-stage sampling window and a second-stage sampling window, and the second-stage sampling window is compared to the first-stage sampling window.
  • the start time of the window is delayed by a preset time period;
  • the base station uses the first level sampling window and the second level sampling window to respectively receive PRACHs of UEs from different coverage areas.
  • the processor 502 when performing resource allocation for the UE, blanks a resource of a preset length after the guard interval GT of the PRACH; the preset length is proportional to a maximum coverage radius of the base station.
  • the processor 502 sends the TA that is carried by the 11 bit to the UE;
  • the processor 502 sends the TA that is carried by the 12-bit to the UE, where the 12-bit includes a 1-bit reserved by the protocol.
  • the device embodiment since it basically corresponds to the method embodiment, reference may be made to the partial description of the method embodiment.
  • the device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, ie may be located A place, or it can be distributed to multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. Those of ordinary skill in the art can understand and implement without any creative effort.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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Abstract

本发明实施例公开了一种LTE系统中的上行接入方法，该方法包括：基站使用多级采样窗，分别接收来自不同覆盖范围的UE的PRACH，其中，随着所述基站的最大覆盖半径的阶梯式增加，所述多级采样窗包括的级数也增加。基站对所述PRACH进行PRACH检测后，确定发送所述PRACH的UE的时间提前量TA。基站将所述TA发送至所述UE，以便所述UE根据所述TA调整上行发射时间。本发明利用多级采样窗实现对不同距离范围的UE的分级采样，实现LTE系统中距离基站大于100km的UE的上行接入，从而使得基站能够支持更远的覆盖距离以降低布网成本。

Description

一种LTE系统中的上行接入方法、装置和基站 技术领域
本发明涉及LTE通信技术领域，具体涉及一种LTE系统中的上行接入方法、装置和基站。
背景技术
LTE(Long Term Evolution，长期演进)是由3GPP(The 3rd Generation Partnership Project，第三代合作伙伴计划)组织制定的UMTS(Universal Mobile Telecommunications System，通用移动通信系统)技术标准的长期演进。
根据3GPP协议，标准LTE设计的物理随机接入信道PRACH能够支持的最远覆盖距离为100km。而在某些特大范围或超远距离场景下，比如原始森林监控，海面航运或钻井平台覆盖等，需要基站能够支持更远的覆盖距离以降低布网成本。
发明内容
有鉴于此，本发明提供了一种LTE系统中的上行接入方法、装置和系统，实现了基站大于100km的覆盖距离。
本发明实施例提供了一种LTE系统中的上行接入方法，所述方法包括：
基站使用多级采样窗，分别接收来自不同覆盖范围的终端UE的物理随机接入信道PRACH，其中，随着所述基站的最大覆盖半径的阶梯式增加，所述多级采样窗包括的级数也增加；
所述基站对所述PRACH进行PRACH检测后，确定发送所述PRACH的UE的时间提前量TA；
所述基站将所述TA发送至所述UE，以便所述UE根据所述TA调整上行发射时间。
优选地，所述基站利用多级采样窗，分别接收来自不同覆盖范围的UE的PRACH，包括：
所述基站预先设定多级采样窗，所述多级采样窗至少包括第一级采样窗和 第二级采样窗，所述第二级采样窗比所述第一级采样窗的起始时间延迟预设时间段；
所述基站利用所述第一级采样窗和所述第二级采样窗，分别接收来自不同覆盖范围的UE的PRACH。
优选地，所述方法还包括：
所述基站在为UE进行资源分配时，将所述PRACH的保护间隔GT后的预设长度的资源置空。
优选地，所述预设长度与所述基站的最大覆盖半径成正比。
优选地，所述基站将所述TA发送至所述UE，包括：
当所述UE与所述基站的距离不大于160km时，所述基站将由11bit承载的所述TA发送至所述UE；
当所述UE与所述基站的距离大于160km时，所述基站将由12bit承载的所述TA发送至所述UE，其中所述12bit中包括协议保留的1bit。
本发明还提供了一种LTE系统中的上行接入装置，所述装置包括：
接收模块，用于使用多级采样窗，分别接收来自不同覆盖范围的终端UE的物理随机接入信道PRACH，其中，随着所述基站的最大覆盖半径的阶梯式增加，所述多级采样窗包括的级数也增加；
确定模块，用于对所述PRACH进行PRACH检测后，确定发送所述PRACH的UE的时间提前量TA；
发送模块，用于将所述TA发送至所述UE，以便所述UE根据所述TA调整上行发射时间。
优选地，所述接收模块，包括：
设置子模块，用于预先设定多级采样窗，所述多级采样窗至少包括第一级采样窗和第二级采样窗，所述第二级采样窗比所述第一级采样窗的起始时间延迟预设时间段；
接收子模块，用于利用所述第一级采样窗和所述第二级采样窗，分别接收来自不同覆盖范围的UE的PRACH。
优选地，所述装置还包括：
分配模块，用于在为UE进行资源分配时，将所述PRACH的保护间隔 GT后的预设长度的资源置空。
优选地，所述预设长度与所述基站的最大覆盖半径成正比。
优选地，所述发送模块，包括：
第一发送子模块，用于当所述UE与所述基站的距离不大于160km时，将由11bit承载的所述TA发送至所述UE；
第二发送子模块，用于当所述UE与所述基站的距离大于160km时，将由12bit承载的所述TA发送至所述UE，其中所述12bit中包括协议保留的1bit。
本发明还提供了一种LTE系统中的上行接入基站，所述基站包括存储器和处理器，
所述存储器用于存储程序代码，并将所述程序代码传输给所述处理器；
所述处理器用于根据所述程序代码中的指令，执行以下步骤：使用多级采样窗，分别接收来自不同覆盖范围的终端UE的物理随机接入信道PRACH，其中，随着所述基站的最大覆盖半径的阶梯式增加，所述多级采样窗包括的级数也增加；对所述PRACH进行PRACH检测后，确定发送所述PRACH的UE的时间提前量TA；将所述TA发送至所述UE，以便所述UE根据所述TA调整上行发射时间。
优选地，所述处理器，具体用于预先设定多级采样窗，所述多级采样窗至少包括第一级采样窗和第二级采样窗，所述第二级采样窗比所述第一级采样窗的起始时间延迟预设时间段；使用所述第一级采样窗和所述第二级采样窗，分别接收来自不同覆盖范围的UE的PRACH。
优选地，所述处理器，还用于在为UE进行资源分配时，将所述PRACH的保护间隔GT后的预设长度的资源置空。
优选地，所述处理器，具体用于当所述UE与所述基站的距离不大于160km时，将由11bit承载的所述TA发送至所述UE；当所述UE与所述基站的距离大于160km时，将由12bit承载的所述TA发送至所述UE，其中所述12bit中包括协议保留的1bit。
本发明提供的LTE系统中的上行接入方法中，基站利用多级采样窗，分别接收来自不同覆盖范围的终端UE的PRACH，所述多级采样窗包括的级数与所述基站的最大覆盖半径成正比。所述基站对所述PRACH进行PRACH检测后，确定发送所述PRACH的UE的时间提前量TA。最后，所述基站将所 述TA发送至所述UE，以便所述UE根据所述TA调整上行发射时间。本发明利用多级采样窗实现对不同距离范围的UE的分级采样，更准确的实现LTE系统中距离基站大于100km的UE的上行接入。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请中记载的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本发明实施例提供的一种LTE系统中的上行接入方法的流程图；
图2为本发明实施例提供的一种基站利用多级采样窗采集来自距所述基站不同距离的UE的PRACH序列的示意图；
图3为本发明实施例提供的一种利用12bit承载TA的帧格式示意图；
图4为本发明实施例提供的一种LTE系统中的上行接入装置的结构示意图；
图5为本发明实施例提供的一种LTE系统中的上行接入基站的结构示意图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
目前，根据3GPP协议，标准LTE设计的基站能够支持的最远覆盖距离为100km。为了满足大于100km的超远覆盖距离的实施场景的需求，本发明实施例提供的上行接入方法利用多级采样窗实现对不同距离范围的UE的分级采样，实现LTE系统中距离基站大于100km的UE的上行接入。另外，本发明实施例中基站在资源分配时将PRACH的GT后预设长度的资源不分配给任何 UE，实现PRACH的扩展，进而使得扩展后的PRACH能够支持距离大于100km的UE的上行接入。
在以下实施例中，终端可以是对讲机，但不限于此。
下面对本发明实施例进行描述。
参考图1，为本发明实施例提供的一种LTE系统中的上行接入方法的流程图，所述方法包括：
S101：基站使用多级采样窗，分别接收来自不同覆盖范围的终端UE的PRACH，其中，随着所述基站的最大覆盖半径的阶梯式增加，所述多级采样窗包括的级数也增加。
S102：所述基站对所述PRACH进行PRACH检测后，确定发送所述PRACH的UE的时间提前量TA。
S103：所述基站将所述TA发送至所述UE，以便所述UE根据所述TA调整上行发射时间。
由于LTE系统的超远距离覆盖场景中，离基站越远的终端发出的Preamble，到达所述基站的时间也就越晚。所以PRACH的保护间隔GT是为了避免到达基站较晚的Preamble与下一个上行子帧冲突。本发明实施例为了实现基站超远距离覆盖，使得距离基站超过100km，甚至超过160km的终端能够成功接入所述基站，所以，本发明实施例中的基站在为终端进行资源分配时，将PRACH的保护间隔GT后的预设长度的资源置空，从而延长GT的长度，形成扩展PRACH。其中，被置空的所述预设长度与所述基站的最大覆盖半径成正比。
S101中，由于LTE系统的超远距离覆盖场景中的终端距基站的距离可以超过100km，甚至超过160km，所以，所述基站仅利用目前用于采集100km以内的终端的采样窗不能准确采集到超远距离的终端发送的PRACH。本发明实施例使用多级采样窗，分别采集处于不同覆盖范围的UE发送的PRACH。具体的，从整体上看所述基站具有的采样窗的级数与所述基站的最大覆盖半径成正比。具体的，随着所述基站的最大覆盖半径的阶梯式增加，所述多级采样窗包括的级数也增加。在所述基站的最大覆盖半径在一个阶梯中增加时，所述 多级采样窗包括的级数是不变的，只有当所述基站的最大覆盖半径增加到下一个阶梯时，所述多级采样窗包括的级数才会增加一级。例如，所述基站的最大覆盖半径在一个阶梯中增加是指所述基站的最大覆盖半径在1-100km之间，或者100km-200km之间变化。所述基站的最大覆盖半径增加到下一个阶梯是指所述基站的最大覆盖半径从1-100km之间变化至100km-200km之间。
实际应用中，所述基站可以根据终端距所述基站的距离，将各个终端分属于不同等级的采样窗采集。例如，利用第一级采样窗采集距所述基站距离为0-100km的终端，利用第二级采样窗采集距所述基站距离为100km-200km的终端，依此类推，实现不同等级采样窗对不同覆盖范围的终端的采集。其中，所述第二级采样窗比所述第一级采样窗的起始时间延迟预设时间段，依此类推，后一级采样窗与前一级采样窗的起始时间相比存在延迟。例如，用于采集距基站100km-200km的第二级采样窗比用于采集距基站0-100km的第一级采样窗的起始时间延迟0.67ms。
如图2所示，为本发明实施例提供的一种基站利用多级采样窗采集来自距所述基站不同距离的UE的PRACH序列的示意图。其中，第一级采样窗用于采集来自0-100km的终端的PRACH序列，第二级采样窗用于采集来自100km-200km的终端的PRACH序列。由于CP部分即为PRACH后面循环移位过来的数据，所以第一级采样窗能够采集到来自0-100km终端的PRACH序列的完整数据，而第二级采样窗能够采集到来自100km-200km终端的PRACH序列的完整数据，依此类推。
S102中，所述基站通过对采集到的来自不同终端的PRACH进行PRACH检测，确定不同终端的时间提前量TA。其中，距离所述基站的距离越远的终端对应的时间提前量TA较长。具体的，所述基站对PRACH进行PRACH检测的方法较多，在此不再赘述。
S103中，当所述基站确定出各个终端对应的时间提前量TA后，将所述TA发送至对应终端，以便各个终端能够根据各自接收到的TA，调整自身的上行发射时间。其中，距离所述基站距离较远的终端的TA较长，则所述终端需要提前较长时间发射上行数据。
本发明实施例提供的LTE系统中的上行接入方法中，基站利用多级采样窗，分别接收来自不同覆盖范围的UE的PRACH，所述多级采样窗包括的级 数与所述基站的最大覆盖半径成正比。所述基站对所述PRACH进行PRACH检测后，确定发送所述PRACH的UE的时间提前量TA。最后，所述基站将所述TA发送至所述UE，以便所述UE根据所述TA调整上行发射时间。本发明实施例利用多级采样窗实现对不同距离范围的UE的分级采样，更准确的实现LTE系统中距离基站大于100km的UE的上行接入，从而使得基站能够支持更远的覆盖距离以降低布网成本。
另外，由于目前的LTE标准协议中规定的TA只能由11bit承载，即使将[0，2^11-1]的范围全部用满，则可以最远支持基站覆盖160km的距离。事实上目前只用了[0，1282]这个范围，即TA值为1282*16Ts＝0.67ms，对应基站最大覆盖距离100km。
本发明实施例为了使得TA的值能够支持基站实现更远距离的覆盖，所以本发明实施例将帧结构中目前协议保留的一个bit也用于承载TA，也就是说，本发明实施例可以利用12bit承载TA，从而使得此时的TA值能够支持基站实现更远距离的覆盖，事实上可以支持基站最远实现320km的覆盖距离。如图3所示，为本发明实施例提供的一种利用12bit承载TA的帧格式示意图，其中，R为目前协议保留的一个bit，本发明实施例利用R的一个bit和原有的11bit的Timing Advance Command共同承载TA，从而使得能够承载的TA值更大，进而支持基站最远实现320km的覆盖距离。
实际应用中，基站在向各个UE发送TA之前，首先确定所述UE与基站的距离是否查过160km。当所述UE与所述基站的距离不大于160km时，所述基站将由11bit承载的所述TA发送至所述UE；当所述UE与所述基站的距离大于160km时，所述基站将由12bit承载的所述TA发送至所述UE，其中所述12bit中包括协议保留的1bit。本发明实施例通过对承载TA的帧结构的扩展，实现基站的超远距离覆盖。
本发明实施例还提供了一种LTE系统中的上行接入装置，参考图4，为本发明实施例提供的一种LTE系统中的上行接入装置结构示意图，所述装置包括：
接收模块401，用于使用多级采样窗，分别接收来自不同覆盖范围的终端 UE的PRACH，其中，随着所述基站的最大覆盖半径的阶梯式增加，所述多级采样窗包括的级数也增加；
确定模块402，用于对所述PRACH进行PRACH检测后，确定发送所述PRACH的UE的时间提前量TA；
发送模块403，用于将所述TA发送至所述UE，以便所述UE根据所述TA调整上行发射时间。
本发明实施例为了实现基站的超远距离覆盖，使得距离基站超过100km，甚至超过160km的终端能够成功接入所述基站，所以，本发明实施例利用多级采样窗实现对不同距离范围的UE的分级采样，更准确的实现LTE系统中距离基站大于100km的UE的上行接入。
实际应用中，所述接收模块401可以包括：
设置子模块，用于预先设定多级采样窗，所述多级采样窗至少包括第一级采样窗和第二级采样窗，所述第二级采样窗比所述第一级采样窗的起始时间延迟预设时间段；
接收子模块，用于利用所述第一级采样窗和所述第二级采样窗，分别接收来自不同覆盖范围的UE的所述PRACH。
另外，由于LTE系统的超远距离覆盖场景中，离基站越远的终端发出的Preamble，到达所述基站的时间也就越晚。所以PRACH的保护间隔GT是为了避免到达基站较晚的Preamble与下一个上行子帧冲突。本发明实施例为了实现基站超远距离覆盖，使得距离基站超过100km，甚至超过160km的终端能够成功接入所述基站，所述装置还可以包括：
分配模块，用于在为UE进行资源分配时，将所述PRACH的保护间隔GT后的预设长度的资源置空。
其中，所述预设长度与所述基站的最大覆盖半径成正比。
为了支持基站能够实现更远的覆盖距离，本发明实施例对承载TA的帧结构进行扩展，具体的，可以利用12bit承载所述TA，其中所述12bit中包括协议保留的1bit。
具体的，所述发送模块可以包括：
第一发送子模块，用于当所述UE与所述基站的距离不大于160km时，将由11bit承载的所述TA发送至所述UE；
第二发送子模块，用于当所述UE与所述基站的距离大于160km时，将由12bit承载的所述TA发送至所述UE，其中所述12bit中包括协议保留的1bit。
本发明实施例提供的LTE系统中的上行接入装置能够实现以下功能：利用多级采样窗，分别接收来自不同覆盖范围的UE的所述扩展PRACH，所述多级采样窗包括的级数与所述基站的最大覆盖半径成正比。对所述扩展PRACH进行PRACH检测后，确定发送所述扩展PRACH的UE的时间提前量TA。将所述TA发送至所述UE，以便所述UE根据所述TA调整上行发射时间。本发明实施例利用多级采样窗实现对不同距离范围的UE的分级采样，更准确的实现LTE系统中距离基站大于100km的UE的上行接入。另外，本发明实施例通过对承载TA的帧结构进行扩展，利用12bit承载TA，从而能够支持基站实现更远的覆盖距离。
本发明还提供了一种LTE系统中的上行接入基站的结构示意图，如图5所示，其中，所述基站至少包括一个存储器501和至少一个处理器502，还包括至少一个网络接口503；存储器501、处理器502和网络接口503之间通过总线相互连接。
存储器501用于存储程序代码，并将该程序代码传输给该处理器502。
处理器502用于根据所述程序代码中的指令，执行以下步骤：使用多级采样窗，分别接收来自不同覆盖范围的终端UE的PRACH，其中，随着所述基站的最大覆盖半径的阶梯式增加，所述多级采样窗包括的级数也增加；对所述PRACH进行PRACH检测后，确定发送所述PRACH的UE的时间提前量TA；将所述TA发送至所述UE，以便所述UE根据所述TA调整上行发射时间。
进一步的，所述处理器502预先设定多级采样窗，所述多级采样窗至少包括第一级采样窗和第二级采样窗，所述第二级采样窗比所述第一级采样窗的起始时间延迟预设时间段；
所述基站利用所述第一级采样窗和所述第二级采样窗，分别接收来自不同覆盖范围的UE的PRACH。
进一步的，所述处理器502在为UE进行资源分配时，将所述PRACH的保护间隔GT后的预设长度的资源置空；所述预设长度与所述基站的最大覆盖半径成正比。
更进一步的，当所述UE与所述基站的距离不大于160km时，所述处理器502将由11bit承载的所述TA发送至所述UE；
当所述UE与所述基站的距离大于160km时，所述处理器502将由12bit承载的所述TA发送至所述UE，其中所述12bit中包括协议保留的1bit。
对于装置实施例而言，由于其基本对应于方法实施例，所以相关之处参见方法实施例的部分说明即可。以上所描述的装置实施例仅仅是示意性的，其中所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部模块来实现本实施例方案的目的。本领域普通技术人员在不付出创造性劳动的情况下，即可以理解并实施。
需要说明的是，本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程，是可以通过计算机程序来指令相关的硬件来完成，所述的程序可存储于一计算机可读取存储介质中，该程序在执行时，可包括如上述各方法的实施例的流程。其中，所述的存储介质可为磁碟、光盘、只读存储记忆体(Read-Only Memory，ROM)或随机存储记忆体(Random Access Memory，RAM)等。
以上对本发明实施例所提供的一种LTE系统中的上行接入方法、装置和基站进行了详细介绍，本文中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的方法及其核心思想；同时，对于本领域的一般技术人员，依据本发明的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本发明的限制。

Claims (14)

  1. 一种LTE系统中的上行接入方法，其特征在于，所述方法包括：
    基站使用多级采样窗，分别接收来自不同覆盖范围的终端UE的物理随机接入信道PRACH，其中，随着所述基站的最大覆盖半径的阶梯式增加，所述多级采样窗包括的级数也增加；
    所述基站对所述PRACH进行PRACH检测后，确定发送所述PRACH的UE的时间提前量TA；
    所述基站将所述TA发送至所述UE，以便所述UE根据所述TA调整上行发射时间。
  2. 根据权利要求1所述的方法，其特征在于，所述基站使用多级采样窗，分别接收来自不同覆盖范围的UE的PRACH，包括：
    所述基站预先设定多级采样窗，所述多级采样窗至少包括第一级采样窗和第二级采样窗，所述第二级采样窗比所述第一级采样窗的起始时间延迟预设时间段；
    所述基站使用所述第一级采样窗和所述第二级采样窗，分别接收来自不同覆盖范围的UE的PRACH。
  3. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    所述基站在为UE进行资源分配时，将所述PRACH的保护间隔GT后的预设长度的资源置空。
  4. 根据权利要求3所述的方法，其特征在于，所述预设长度与所述基站的最大覆盖半径成正比。
  5. 根据权利要求1所述的方法，其特征在于，所述基站将所述TA发送至所述UE，包括：
    当所述UE与所述基站的距离不大于160km时，所述基站将由11bit承载的所述TA发送至所述UE；
    当所述UE与所述基站的距离大于160km时，所述基站将由12bit承载的所述TA发送至所述UE，其中所述12bit中包括协议保留的1bit。
  6. 一种LTE系统中的上行接入装置，其特征在于，所述装置包括：
    接收模块，用于使用多级采样窗，分别接收来自不同覆盖范围的终端UE 的物理随机接入信道PRACH，其中，随着所述基站的最大覆盖半径的阶梯式增加，所述多级采样窗包括的级数也增加；
    确定模块，用于对所述PRACH进行PRACH检测后，确定发送所述PRACH的UE的时间提前量TA；
    发送模块，用于将所述TA发送至所述UE，以便所述UE根据所述TA调整上行发射时间。
  7. 根据权利要求6所述装置，其特征在于，所述接收模块，包括：
    设置子模块，用于预先设定多级采样窗，所述多级采样窗至少包括第一级采样窗和第二级采样窗，所述第二级采样窗比所述第一级采样窗的起始时间延迟预设时间段；
    接收子模块，用于使用所述第一级采样窗和所述第二级采样窗，分别接收来自不同覆盖范围的UE的PRACH。
  8. 根据权利要求6所述装置，其特征在于，所述装置还包括：
    分配模块，用于在为UE进行资源分配时，将所述PRACH的保护间隔GT后的预设长度的资源置空。
  9. 根据权利要求8所述装置，其特征在于，所述预设长度与所述基站的最大覆盖半径成正比。
  10. 根据权利要求6所述装置，其特征在于，所述发送模块，包括：
    第一发送子模块，用于当所述UE与所述基站的距离不大于160km时，将由11bit承载的所述TA发送至所述UE；
    第二发送子模块，用于当所述UE与所述基站的距离大于160km时，将由12bit承载的所述TA发送至所述UE，其中所述12bit中包括协议保留的1bit。
  11. 一种LTE系统中的上行接入基站，其特征在于，所述基站包括存储器和处理器，
    所述存储器用于存储程序代码，并将所述程序代码传输给所述处理器；
    所述处理器用于根据所述程序代码中的指令，执行以下步骤：使用多级采样窗，分别接收来自不同覆盖范围的终端UE的物理随机接入信道PRACH，其中，随着所述基站的最大覆盖半径的阶梯式增加，所述多级采样窗包括的级数也增加；对所述PRACH进行PRACH检测后，确定发送所述PRACH的UE 的时间提前量TA；将所述TA发送至所述UE，以便所述UE根据所述TA调整上行发射时间。
  12. 根据权利要求11所述的基站，其特征在于，所述处理器，具体用于预先设定多级采样窗，所述多级采样窗至少包括第一级采样窗和第二级采样窗，所述第二级采样窗比所述第一级采样窗的起始时间延迟预设时间段；使用所述第一级采样窗和所述第二级采样窗，分别接收来自不同覆盖范围的UE的PRACH。
  13. 根据权利要求11所述的基站，其特征在于，所述处理器，还用于在为UE进行资源分配时，将所述PRACH的保护间隔GT后的预设长度的资源置空。
  14. 根据权利要求11所述的基站，其特征在于，所述处理器，具体用于当所述UE与所述基站的距离不大于160km时，将由11bit承载的所述TA发送至所述UE；当所述UE与所述基站的距离大于160km时，将由12bit承载的所述TA发送至所述UE，其中所述12bit中包括协议保留的1bit。
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