WO2012119368A1 - 一种导频的发送方法及*** - Google Patents

一种导频的发送方法及*** Download PDF

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Publication number
WO2012119368A1
WO2012119368A1 PCT/CN2011/077883 CN2011077883W WO2012119368A1 WO 2012119368 A1 WO2012119368 A1 WO 2012119368A1 CN 2011077883 W CN2011077883 W CN 2011077883W WO 2012119368 A1 WO2012119368 A1 WO 2012119368A1
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WO
WIPO (PCT)
Prior art keywords
subframe
base station
pilot
uplink
demodulation pilot
Prior art date
Application number
PCT/CN2011/077883
Other languages
English (en)
French (fr)
Inventor
林志嵘
夏树强
郁光辉
梁春丽
戴博
郝鹏
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to US14/003,584 priority Critical patent/US9277453B2/en
Publication of WO2012119368A1 publication Critical patent/WO2012119368A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W28/00Network traffic management; Network resource management
    • H04W28/02Traffic management, e.g. flow control or congestion control
    • H04W28/10Flow control between communication endpoints
    • H04W28/12Flow control between communication endpoints using signalling between network elements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048Allocation of pilot signals, i.e. of signals known to the receiver
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0091Signaling for the administration of the divided path
    • H04L5/0094Indication of how sub-channels of the path are allocated
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W28/00Network traffic management; Network resource management
    • H04W28/02Traffic management, e.g. flow control or congestion control
    • H04W28/06Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/08Access restriction or access information delivery, e.g. discovery data delivery
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/08Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel

Definitions

  • the present invention relates to the field of digital communications, and in particular, to a method for transmitting pilot of 3GPP LTE (Long Term Evolution)/Advanced 3 GPP Long Term Evolution-Advanced (LTE-Advanced, Long Term Evolution-Advanced) indoor and hotspot coverage evolution. system. Background technique
  • the characteristics are as follows: The user is usually a fixed user, or a user moving at a very low speed, the user has low mobility requirements, has a small wireless channel delay spread, and wireless The channel environment changes slowly.
  • the data service is mainly Internet service based on Internet Protocol (IP, Internet Procotol).
  • IP Internet Protocol
  • QoS Quality of Serveice
  • the LTE/LTE-Advanced system is mainly applied to large coverage (500 meters to 100 kilometers) and multiple channels (speed can be from 3)
  • a low-speed IP packet service if the pilot transmission scheme of the data service covered by the existing indoor and hotspots is still used, the pilot overhead is too large, the efficiency is low, and the cost is too high.
  • the pilot transmission scheme of the existing indoor and hotspot covered data services is to transmit demodulation pilots in each subframe of the uplink/downlink
  • the pilot overhead is too large, the efficiency is low, and the cost is too high. problem. Therefore, when LTE/LTE-Advanced technology is applied in a high-rate indoor and hotspot coverage channel environment, in order to avoid the above problems, it is necessary to reduce the pilot overhead and increase the system capacity, which is an urgent need to be solved. . Summary of the invention
  • the main object of the present invention is to provide a method and system for transmitting pilots, which can reduce pilot overhead and improve the capacity of the LTE/LTE-Advanced system.
  • a method for transmitting a pilot comprising: selectively transmitting or not transmitting a demodulation pilot on a corresponding subframe according to a setting of a subframe in a control signaling to trigger or not trigger a demodulation pilot transmission.
  • the setting of the subframe triggering or not triggering the demodulation pilot transmission includes: implementing by using an indication manner in the control signaling; the indication manner is: the base station indicates, by using control signaling, whether the resource allocated to the mobile station is sent. Demodulate the pilot.
  • the indication manner is: when the service type is a semi-static persistent scheduling service, the base station indicates, by using the high layer signaling, in which subframes, the demodulation pilot is transmitted.
  • the indication manner is: The base station indicates that the transmission of the demodulation pilot is triggered or not triggered in the subframe by setting the corresponding bit of the physical control channel to 1 or 0.
  • the method further includes: when the resource allocated by the base station to the mobile station is an uplink resource, and the base station indicates, by using control signaling, that the triggering demodulation pilot is sent in the uplink subframe, the method further includes: When the pilot is adjusted, the demodulation pilot is sent on part or all of the subcarriers of the dedicated fixed symbol position of the uplink subframe to which the allocated resource belongs;
  • the method further includes: the mobile station is dedicated to the uplink subframe to which the resource belongs Send user data on a fixed symbol location.
  • the fixed symbol position is: the last OFDM or SC-FDMA symbol of the first time slot of the subframe; or
  • the fixed symbol position is: the first time slot of the subframe and the fourth OFDM or SC-FDMA symbol of the second time slot; or, when the uplink symbol cyclic prefix
  • the fixed symbol position is: the first slot of the subframe and the third OFDM or SC-FDMA symbol of the second slot.
  • the method further includes: when the base station sends the demodulation pilot, the The demodulation pilot is sent at a fixed time-frequency position in a downlink subframe to which the allocated resource belongs;
  • the method further includes: fixing, by the base station, the downlink subframe to which the allocated resource belongs User data is sent at the time-frequency location.
  • a transmitting system for a pilot comprising: a pilot selection transmitting unit, configured to selectively send or not to transmit on a corresponding subframe according to a setting of a subframe triggering or not triggering a demodulation pilot transmission in the control signaling Transmit demodulation pilots.
  • the setting of the subframe triggering or not triggering the demodulation pilot transmission includes: implementing by using an indication manner in the control signaling; the indication manner is: the base station indicates, by using control signaling, whether the resource allocated to the mobile station is sent. Demodulate the pilot.
  • the pilot selection sending unit is further configured to allocate the base station to the mobile station When the resource is an uplink resource and the base station indicates that the demodulation pilot is transmitted in the uplink subframe by using the control signaling, when the mobile station transmits the demodulation pilot, the demodulation pilot is in the uplink subframe to which the allocated resource belongs. Sending on a part or all of the subcarriers of the dedicated fixed symbol position;
  • the system further includes a user data sending unit, configured to: when the resource allocated by the base station to the mobile station is an uplink resource, and the base station indicates by the control signaling that the demodulation pilot is not triggered to be sent in the uplink subframe, the mobile station is The user data is transmitted at a dedicated fixed symbol position of the uplink subframe to which the allocated resource belongs.
  • the fixed symbol position is: the last OFDM symbol of the first time slot of the subframe; or
  • the fixed symbol position is: the first time slot of the subframe and the fourth OFDM symbol of the second time slot; or
  • the fixed symbol position is: the first slot of the subframe and the third OFDM symbol of the second slot.
  • the pilot selection sending unit is further configured to: when the resource allocated by the base station to the mobile station is a downlink resource, and the base station indicates, by using control signaling, that the triggering demodulation pilot is sent in the downlink subframe, the base station sends Demodulating the pilot, the demodulation pilot is sent at a fixed time-frequency position in a downlink subframe to which the allocated resource belongs;
  • the system further includes a user data sending unit, configured to: when the resource allocated by the base station to the mobile station is a downlink resource, and the base station indicates by the control signaling that the demodulation pilot is not triggered to be sent in the downlink subframe, the base station is allocated User data is transmitted at a fixed time-frequency position in a downlink subframe to which the resource belongs.
  • a user data sending unit configured to: when the resource allocated by the base station to the mobile station is a downlink resource, and the base station indicates by the control signaling that the demodulation pilot is not triggered to be sent in the downlink subframe, the base station is allocated User data is transmitted at a fixed time-frequency position in a downlink subframe to which the resource belongs.
  • the invention selectively transmits or not transmits demodulation pilots on the corresponding subframe according to the setting of the subframe signaling in the control signaling or not triggering the demodulation pilot transmission. Since the present invention is different from the prior art, the demodulation pilot is not transmitted in every subframe. Therefore, the selective scheme of transmitting the demodulation pilot on the subframe can reduce the pilot overhead and improve the LTE/LTE. - The capacity of the Advanced system. DRAWINGS
  • FIG. 1 is a flowchart showing the principle implementation of a pilot transmission method according to the present invention
  • FIG. 3 is a schematic diagram of a pilot pattern when an uplink demodulation pilot is triggered and a UE transmits an uplink demodulation pilot in a last SC-FDMA symbol of a first time slot of an uplink subframe according to the present invention
  • FIG. 4 is a schematic diagram of a pilot pattern when a base station transmits a downlink demodulation pilot when the uplink demodulation pilot is triggered, and when the CP length is a normal length;
  • 5 is a schematic diagram of a pilot pattern when a base station transmits a downlink demodulation pilot when the uplink demodulation pilot is triggered, and when the CP length is an extended length;
  • FIG. 6 is a schematic diagram of a pilot pattern when an uplink demodulation pilot is triggered, and orthogonal pilot transmission of multiple users is implemented by frequency division according to the present invention
  • FIG. 7 is a schematic diagram of a pilot pattern when an uplink demodulation pilot is triggered and the orthogonal pilot transmission of multiple users is implemented by code division according to the present invention
  • the basic idea of the present invention is: selectively transmitting or not transmitting demodulation pilots on corresponding subframes according to whether the subframes in the control signaling trigger or do not trigger the demodulation pilot transmission.
  • the pilot transmission scheme of the present invention is directed to the problem that the pilot overhead is too large, the efficiency is too low, and the cost is too high in the indoor and hotspot coverage data service deployment application scenario of the LTE/LTE-Advanced technology, and the proposed pilot overhead is reduced.
  • a solution for increasing the capacity of an LTE/LTE-Advanced system in the application includes one base station (such as an eNode B) and at least one mobile station (such as a UE), and the base station has a function of transmitting control information and user data to the mobile station, and receiving data transmission by one or more mobile stations.
  • a method for transmitting a pilot mainly comprising the following contents:
  • the demodulation pilot is selectively transmitted or not transmitted on the corresponding subframe according to the setting of the subframe in the control signaling to trigger or not to trigger the demodulation pilot transmission.
  • the setting of the subframe triggering or not triggering the demodulation pilot transmission specifically includes: implementing by using an indication manner in the control signaling.
  • the indication manner is: The base station indicates whether the demodulation pilot is transmitted in the resource allocated to the mobile station by using control signaling.
  • the indication manner is specifically: The base station indicates, in the high-level signaling, in which subframes, the demodulation pilot is sent.
  • the indication manner is specifically: the base station sets the physical control channel (PDCCH) corresponding bit to be 1 or 0, indicating that the demodulation pilot transmission is triggered or not triggered in the subframe.
  • the indication triggers the transmission of the demodulation pilot on the subframe; when the corresponding bit of the PDCCH is 0, the indication trigger does not transmit the demodulation pilot on the subframe.
  • PDCCH physical control channel
  • the base station when the resources allocated by the base station to the mobile station are specifically uplink resources (at this time, the mobile station transmits data, the base station receives data), and the base station indicates, by using control signaling, that the triggering demodulation pilot is transmitted in the uplink subframe, the mobile station When the demodulation pilot is transmitted, the demodulation pilot is transmitted on part or all of the subcarriers of the dedicated fixed symbol position of the uplink subframe to which the allocated resource belongs.
  • the mobile station When the resource allocated by the base station to the mobile station is specifically an uplink resource, and the base station indicates, by the control signaling, that the demodulation pilot is not triggered to be transmitted in the uplink subframe, the mobile station is in a dedicated fixed symbol position of the uplink subframe to which the allocated resource belongs. Send user data. That is to say, at this time, the mobile station transmits the user data at the position where the demodulation pilot is transmitted as described above.
  • the subcarrier is a frequency.
  • the concept of domain resources, the number of subcarriers represents the number of frequency domain resources; and the subframe is a concept of time domain resources, and the subframe is the number of resources representing the time domain.
  • a pilot signal in one subframe can occupy a plurality of subcarriers.
  • the relationship between the subframe and the subcarrier is: one subframe is composed of multiple OFDM symbols, and one OFDM symbol is composed of multiple subcarriers. When the OFDM signal is transmitted, the more subcarriers it contains, the larger the bandwidth of the transmitted signal.
  • the fixed symbol position specifically includes: a last one OFDM symbol of the first time slot of the foregoing subframe;
  • the third OFDM symbol of the first time slot and the second time slot of the foregoing subframe is transmitted (when the uplink symbol cyclic prefix length is an extended length).
  • the above subframe refers to the above subframe that can trigger the transmission of the demodulation pilot.
  • the transmission of the multiple orthogonal demodulation pilots may be implemented by means of code division, frequency division, and the like.
  • the base station transmits data, the mobile station receives data
  • the base station indicates, by using control signaling, that the triggering demodulation pilot is transmitted in the downlink subframe
  • the mobile station When transmitting the demodulation pilot, the demodulation pilot is transmitted at a fixed time-frequency position in the downlink subframe to which the allocated resource belongs.
  • the mobile station When the resource allocated by the base station to the mobile station is specifically a downlink resource, and the base station indicates, by using the control signaling, that the demodulation pilot is not triggered to be transmitted in the downlink subframe, the mobile station is in a fixed time-frequency position in the downlink subframe to which the allocated resource belongs. Send user data. That is to say, at this time, the mobile station transmits the user data at the position where the demodulation pilot is transmitted as described above.
  • the invention is illustrated by way of example below.
  • the principle implementation process of the pilot transmission method of the present invention includes the following steps: Step 101: Send control signaling, where subframe signaling is triggered or not triggered. Frequency transmission.
  • Step 102 The base station/mobile station triggers or does not trigger demodulation pilot transmission according to the set subframe, and selectively transmits or does not transmit the demodulation pilot on the corresponding subframe.
  • pilots when demodulating pilot transmissions are as follows:
  • the length of the uplink signal cyclic prefix (CP, Cyclic Prefix) is a normal length, and the UE is set to be in the uplink subframe.
  • the 4th OFDM symbol of the 1st time slot and the 2nd time slot transmits an uplink demodulation pilot, and the pilot pattern transmitted at this time is as shown in FIG. 2.
  • Subframe 1 does not trigger the uplink demodulation pilot, so the pilot transmission position of subframe 1 is used to transmit the user uplink data.
  • the location of the pilot signal transmitted by the demodulation pilot is shown; I _ I indicates the location of the user data transmitted by the user data.
  • the length of the uplink signal CP is a normal length, and the UE is set to be at the end of the first slot of the uplink subframe.
  • An OFDM symbol transmits an uplink demodulation pilot, and the pilot pattern transmitted at this time is as shown in FIG.
  • Subframe 1 does not trigger the uplink demodulation pilot, so the pilot transmission position of subframe 1 is used to transmit the user uplink data.
  • the location of the pilot signal transmitted by the demodulation pilot is indicated; I indicates the location of the user data transmitted by the user data.
  • the downlink signal CP length is a normal length, and the base station is configured to use the antenna port 5 to transmit downlink demodulation.
  • Pilot the pilot pattern transmitted by the base station at this time is as shown in FIG.
  • Subframe 1 does not trigger the downlink pilot, so the pilot transmission position of subframe 1 is used to transmit downlink data.
  • Demodulating the position of the pilot signal sent by the pilot; I _ I indicates the user data sent by the user data Location.
  • the downlink signal CP length is an extended length, and the setting base station transmits the downlink demodulation pilot using the antenna port 5,
  • the pilot pattern transmitted by the base station is as shown in FIG. 5.
  • Subframe 2 does not trigger the downlink demodulation pilot, so the pilot transmission position of subframe 2 is used to transmit downlink data.
  • the location of the pilot signal transmitted by the demodulation pilot is indicated; I represents the location of the user data transmitted by the user data ( Embodiment 5:
  • the uplink signal CP length is a normal length
  • the UE is set to be in the first slot and the first subframe of the uplink subframe.
  • the 4th OFDM symbol of 2 slots transmits an uplink demodulation pilot
  • the UE transmits two orthogonal pilot signals by using a frequency division method.
  • the pilot pattern transmitted at this time is as shown in FIG. 6.
  • the different pilot signals in Figure 6 are placed on subcarriers of different frequencies within a symbol.
  • subframe 1 does not trigger the uplink demodulation pilot, so the pilot transmission position of subframe 1 is used to transmit the user uplink data.
  • the position of the pilot signal 1 transmitted by the demodulation pilot is indicated; the position of the pilot signal 2 transmitted by the demodulation pilot is indicated; I _ I indicates the location of the user data transmitted by the user data.
  • the uplink signal CP length is a normal length
  • the UE is set to be in the first slot and the first subframe of the uplink subframe.
  • the 4th OFDM symbol of 2 slots transmits an uplink demodulation pilot
  • the UE transmits two orthogonal pilot signals by using a code division method.
  • the pilot pattern transmitted at this time is as shown in FIG. 7.
  • the different pilot signals in Figure 7 are placed on the same time-frequency resource, using different orthogonal codes for differentiation.
  • subframe 1 does not trigger the uplink demodulation pilot, so the pilot transmission position of subframe 1 is used to transmit user uplink data.
  • the pilot signal 1 and the pilot signal transmitted by the demodulation pilot in FIG. 7 are shown.
  • the position where the number 2 is superimposed; I _ I indicates the location of the user data sent by the user data.
  • the eNB transmits the uplink demodulation pilot in the subframe 0 and the subframe 2 in the uplink signal through the high-layer configuration, and the length of the uplink signal cyclic prefix (CP, Cyclic Prefix) is a normal length, and the UE is set to be in the uplink.
  • the first OFDM symbol of the first slot of the frame and the fourth OFDM symbol of the second slot transmit the uplink demodulation pilot, and the pilot pattern transmitted at this time is as shown in FIG.
  • Subframe 1 and subframe 3 do not trigger the uplink demodulation pilot, so the pilot transmission positions of subframe 1 and subframe 3 are used to transmit user uplink data.
  • I _ I indicates the location of the user data sent by the user data.
  • a pilot transmitting system comprising: a pilot selection transmitting unit, wherein the pilot selection transmitting unit is configured to trigger or not trigger a demodulation pilot transmission according to a subframe in the control signaling, and selectively The demodulation pilot is transmitted or not transmitted on the frame.
  • the setting of the subframe triggering or not triggering the demodulation pilot transmission specifically includes: implementing by using an indication manner in the control signaling; the indication manner is: the base station indicates, by using the control signaling, whether the demodulation guide is sent in the resource allocated to the mobile station. frequency.
  • the pilot selection transmitting unit is further configured to: when the resource allocated by the base station to the mobile station is specifically an uplink resource, and the base station indicates, by using control signaling, that the trigger demodulation pilot is transmitted in the uplink subframe, the mobile station sends the solution.
  • the demodulation pilot is transmitted on part or all of the subcarriers of the dedicated fixed symbol position of the uplink subframe to which the allocated resource belongs.
  • the system further includes a user data sending unit, configured to: when the resource allocated by the base station to the mobile station is specifically an uplink resource, and the base station does not trigger the demodulation pilot to transmit in the uplink subframe by using control signaling, the mobile station is The user data is transmitted at a dedicated fixed symbol position of the uplink subframe to which the allocated resource belongs.
  • the fixed symbol position is specifically: the last one OFDM symbol of the first time slot of the subframe; or, when the uplink symbol cyclic prefix length is a normal length, the fixed symbol position has The first symbol of the subframe and the fourth OFDM symbol of the second slot; or, when the uplink symbol cyclic prefix length is an extended length, the fixed symbol position is specifically: The third OFDM symbol of the time slot and the second time slot.
  • the pilot selection transmitting unit is further configured to: when the resource allocated by the base station to the mobile station is specifically a downlink resource, and the base station triggers the demodulation pilot to be transmitted in the downlink subframe by using control signaling, the base station sends the demodulation guide.
  • the demodulation pilot is transmitted at a fixed time-frequency position in a downlink subframe to which the allocated resource belongs.
  • the system further includes a user data sending unit, configured to: when the resource allocated by the base station to the mobile station is specifically a downlink resource, and the base station indicates, by using control signaling, that the demodulation pilot is not triggered to be transmitted in the downlink subframe, the base station is allocated.
  • User data is transmitted at a fixed time-frequency position in a downlink subframe to which the resource belongs.

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Abstract

本发明公开了一种导频的发送方法,该方法包括:根据控制信令中子帧触发或不触发解调导频发送的设置,有选择的在对应子帧上发送或不发送解调导频。本发明还公开了一种导频的发送***,***中的导频选择发送单元用于根据控制信令中子帧触发或不触发解调导频发送的设置,有选择的在对应子帧上发送或不发送解调导频。采用本发明的方法及***,能降低导频开销,提升LTE/LTE-Advanced***的容量。

Description

一种导频的发送方法及*** 技术领域
本发明涉及数字通信领域, 尤其涉及一种 3GPP长期演进(LTE, Long Term Evolution ) /高级 3 GPP 长期演进 ( LTE- Advanced , Long Term Evolution-Advanced ) 室内、 热点覆盖演进的导频的发送方法及***。 背景技术
随着移动互联网 (Mobile Internet )和智能手机的普及, 移动数据流量 需求飞速增长。 未来十年内 (2011-2020年), 移动数据业务量还将每年翻 一番, 十年将增长一千倍。
运营商网络中数据业务比例逐渐增加, 影响了传统电信级业务, 但是, 由于数据业务按照流量计费, 其盈利增长速度和流量负载不成正比。 此外, 快速增长的数据业务对移动通信网络的传输能力提出了严峻挑战。 大部分 的移动数据业务主要发生在室内和热点环境, 体现为游牧 /本地无线接入场 景。 据统计, 目前移动数据业务量的近 70%发生在室内, 而且这一比例还 将继续增长, 预计到 2012年将会超过 80%, 因此运营商迫切需要高速率的 室内和热点覆盖的数据业务解决方案。
针对目前用户室内和热点覆盖的数据业务而言, 其特征一方面为: 用 户通常为固定的用户、 或者以非常低速移动的用户, 用户对移动性要求不 高, 具有无线信道延迟扩展小, 无线信道环境变化较慢的特点; 另一方面, 数据业务主要为基于互联网协议(IP, Internet Procotol )的互联网业务, 对 服务质量(QoS, Quality of Serveice )的要求比较单一, 且远低于电信级业 务对 QoS的要求。引入 LTE/LTE-Advanced技术后,由于 LTE/LTE-Advanced ***主要应用于大覆盖范围( 500米〜 100千米)、 多种信道(速度可以从 3 千米 /小时到 350千米 /小时, 信道延迟从不超过一微秒到十几微秒)环境, 与现有室内和热点覆盖的数据业务的应用环境不相适应, 因此, 当其承载 大流量低速 IP数据包业务时, 如果仍沿用现有室内和热点覆盖的数据业务 的导频发送方案, 则会带来导频开销过大, 效率偏低, 成本过高的问题。 因为, 现有室内和热点覆盖的数据业务的导频发送方案是上 /下行的每个子 帧都要发送解调导频, 势必会带来导频开销过大, 效率偏低, 成本过高的 问题。 因而, 在高速率的室内和热点覆盖这样的信道环境应用 LTE/LTE- Advanced技术时, 为了避免上述问题, 设法降低导频开销, 提升 ***容量是很有必要的, 是目前迫切需要解决的需求。 发明内容
有鉴于此, 本发明的主要目的在于提供一种导频的发送方法及***, 能降低导频开销, 提升 LTE/LTE-Advanced***的容量。
为达到上述目的, 本发明的技术方案是这样实现的:
一种导频的发送方法, 该方法包括: 根据控制信令中子帧触发或不触 发解调导频发送的设置, 有选择的在对应子帧上发送或不发送解调导频。
其中, 所述子帧触发或不触发解调导频发送的设置包括: 通过控制信 令中的指示方式实现; 所述指示方式为: 基站通过控制信令指示分配给移 动台的资源中是否发送解调导频。
其中, 当业务类型为半静态持续调度业务时, 所述指示方式为: 基站 通过高层信令指示在哪些子帧发送解调导频。
其中, 当业务类型为动态调度业务时, 所述指示方式为: 基站通过设 置物理控制信道的相应比特为 1或 0,指示在子帧中触发或不触发解调导频 的发送。
其中, 当所述基站分配给移动台的资源为上行资源且基站通过控制信 令指示触发解调导频在上行子帧中发送时, 该方法还包括: 移动台发送解 调导频时, 所述解调导频是在分配资源所属上行子帧的专用的固定符号位 置的部分或全部子载波上发送;
当所述基站分配给移动台的资源为上行资源且基站通过控制信令指示 不触发解调导频在上行子帧中发送时, 该方法还包括: 移动台在分配资源 所属上行子帧的专用的固定符号位置上发送用户数据。
其中, 所述固定符号位置为: 子帧的第 1个时隙的最后 1个 OFDM或 SC-FDMA符号; 或者,
当上行符号循环前缀长度为普通长度时, 所述固定符号位置为: 子帧 的第 1个时隙和第 2个时隙的第 4个 OFDM或 SC-FDMA符号; 或者, 当上行符号循环前缀长度为扩展长度时, 所述固定符号位置为: 子帧 的第 1个时隙和第 2个时隙的第 3个 OFDM或 SC-FDMA符号。
其中, 当所述基站分配给移动台的资源为下行资源且基站通过控制信 令指示触发解调导频在下行子帧中发送时, 该方法还包括: 基站发送解调 导频时, 所述解调导频是在分配资源所属下行子帧中的固定时频位置上发 送;
当所述基站分配给移动台的资源为下行资源且基站通过控制信令指示 不触发解调导频在下行子帧中发送时, 该方法还包括: 基站在分配资源所 属下行子帧中的固定时频位置上发送用户数据。
一种导频的发送***, 该***包括: 导频选择发送单元, 用于根据控 制信令中子帧触发或不触发解调导频发送的设置, 有选择的在对应子帧上 发送或不发送解调导频。
其中, 所述子帧触发或不触发解调导频发送的设置包括: 通过控制信 令中的指示方式实现; 所述指示方式为: 基站通过控制信令指示分配给移 动台的资源中是否发送解调导频。
其中, 所述导频选择发送单元, 进一步用于当所述基站分配给移动台 的资源为上行资源且基站通过控制信令指示触发解调导频在上行子帧中发 送的情况下, 移动台发送解调导频时, 所述解调导频是在分配资源所属上 行子帧的专用的固定符号位置的部分或全部子载波上发送;
该***还包括用户数据发送单元, 用于当所述基站分配给移动台的资 源为上行资源且基站通过控制信令指示不触发解调导频在上行子帧中发送 的情况下, 移动台在分配资源所属上行子帧的专用的固定符号位置上发送 用户数据。
其中, 所述固定符号位置为: 子帧的第 1个时隙的最后 1个 OFDM符 号; 或者,
当上行符号循环前缀长度为普通长度时, 所述固定符号位置为: 子帧 的第 1个时隙和第 2个时隙的第 4个 OFDM符号; 或者,
当上行符号循环前缀长度为扩展长度时, 所述固定符号位置为: 子帧 的第 1个时隙和第 2个时隙的第 3个 OFDM符号。
其中, 所述导频选择发送单元, 进一步用于当所述基站分配给移动台 的资源为下行资源且基站通过控制信令指示触发解调导频在下行子帧中发 送的情况下, 基站发送解调导频时, 所述解调导频是在分配资源所属下行 子帧中的固定时频位置上发送;
该***还包括用户数据发送单元, 用于当所述基站分配给移动台的资 源为下行资源且基站通过控制信令指示不触发解调导频在下行子帧中发送 的情况下, 基站在分配资源所属下行子帧中的固定时频位置上发送用户数 据。
本发明根据控制信令中子帧触发或不触发解调导频发送的设置, 有选 择的在对应子帧上发送或不发送解调导频。 由于本发明区别于现有技术, 并不是在每个子帧都发送解调导频, 因此, 这种有选择的在子帧上发送解 调导频的方案能降低导频开销, 提升 LTE/LTE-Advanced***的容量。 附图说明
图 1为本发明的导频发送方法的原理实现流程图;
图 2为本发明的当上行解调导频被触发, UE在上行子帧的第 1个时隙 和第 2个时隙的第 4个 SC-FDMA符号发送上行解调导频时的导频图案示 意图;
图 3为本发明的当上行解调导频被触发, UE在上行子帧的第 1个时隙 的最后一个 SC-FDMA符号发送上行解调导频时的导频图案示意图;
图 4为本发明的当上行解调导频被触发, 且当 CP长度为正常长度时, 基站发送下行解调导频时的导频图案示意图;
图 5为本发明的当上行解调导频被触发, 且当 CP长度为扩展长度时, 基站发送下行解调导频时的导频图案示意图;
图 6为本发明的当上行解调导频被触发, 且通过频分实现多个用户的 正交导频发送的导频图案示意图;
图 7为本发明的当上行解调导频被触发, 且通过码分实现多个用户的 正交导频发送的导频图案示意图;
图 8为本发明的 eNB通过高层配置指示 UE在固定子帧中发送上行解 调导频时, UE在上行子帧的第 1个时隙和第 2个时隙的第 4个 SC-FDMA 符号发送上行解调导频时的导频图案示意图。 具体实施方式
本发明的基本思想是: 根据控制信令中子帧触发或不触发解调导频发 送的设置, 有选择的在对应子帧上发送或不发送解调导频。
下面结合附图对技术方案的实施作进一步的详细描述。
本发明的导频发送方案, 是针对 LTE/LTE- Advanced技术在室内、 热点 覆盖数据业务部署应用场景中导频开销过大, 效率偏低, 成本过高的问题, 提出的降低导频开销, 提升 LTE/LTE-Advanced***容量的方案, 在该应用 场景中, 包括 1个基站(如 eNode B )和至少 1个移动台 (如 UE ) , 基站具 有向移动台发送控制信息和用户数据、 接收 1 个或多个移动台发送数据的 功能。
一种导频的发送方法, 该方法主要包括以下内容:
根据控制信令中子帧触发或不触发解调导频发送的设置, 有选择的在 对应子帧上发送或不发送解调导频。
进一步的, 子帧触发或不触发解调导频发送的设置具体包括: 通过控 制信令中的指示方式实现。 该指示方式为: 基站通过控制信令指示分配给 移动台的资源中是否发送解调导频。
进一步的, 当业务类型为半静态持续调度业务时, 该指示方式具体为: 基站通过高层信令指示在哪些子帧中发送解调导频。
进一步的, 当业务类型为动态调度业务时, 该指示方式具体为: 基站 通过设置物理控制信道(PDCCH ) 的相应比特为 1或 0, 指示在子帧中触 发或不触发解调导频的发送。 比如, 在 PDCCH的相应比特为 1时, 指示触 发在子帧上发送解调导频; 在 PDCCH的相应比特为 0时,指示触发在子帧 上不发送解调导频。
进一步的, 当基站分配给移动台的资源具体为上行资源 (此时, 移动 台发送数据, 基站接收数据)且基站通过控制信令指示触发解调导频在上 行子帧中发送时, 移动台发送解调导频时, 解调导频是在分配资源所属上 行子帧的专用的固定符号位置的部分或全部子载波上发送。
而当基站分配给移动台的资源具体为上行资源且基站通过控制信令指 示没有触发解调导频在上行子帧中发送时, 移动台在分配资源所属上行子 帧的专用的固定符号位置上发送用户数据。 也就是说, 此时, 移动台是在 上述发送解调导频的位置上发送用户数据。
这里需要指出的是, 针对文中的子帧和子载波而言, 子载波是一个频 域资源的概念, 子载波的多少代表的是频域资源数量; 而子帧是一个时域 资源的概念, 子帧是代表时域资源的数量。 一个子帧中的导频信号可以占 据多个子载波。子帧和子载波的关系为:一个子帧由多个 OFDM符号组成, 一个 OFDM符号由多个子载波组成, OFDM信号发送时, 其包含的子载波 越多代表发送的信号带宽越大。
进一步的, 该固定符号位置具体包括: 上述子帧的第 1个时隙的最后 1 个 OFDM符号;
或者, 上述子帧的第 1个时隙和第 2个时隙的第 4个 OFDM符号发送 (当上行符号循环前缀长度为普通长度时);
或者, 上述子帧的第 1个时隙和第 2个时隙的第 3个 OFDM符号发送 (当上行符号循环前缀长度为扩展长度时)。
这里需要指出的是: 上述子帧指上述能触发发送解调导频的子帧。 进一步的, 当移动台需要发送多个正交的解调导频时, 可以通过码分、 频分等方式实现多路正交的解调导频的发送。
进一步的, 当基站分配给移动台的资源具体为下行资源 (此时, 基站 发送数据, 移动台接收数据)且基站通过控制信令指示触发解调导频在下 行子帧中发送时, 移动台发送解调导频时, 解调导频是在分配资源所属下 行子帧中的固定时频位置上发送。
而当基站分配给移动台的资源具体为下行资源且基站通过控制信令指 示没有触发解调导频在下行子帧中发送时, 移动台在分配资源所属下行子 帧中的固定时频位置上发送用户数据。 也就是说, 此时, 移动台是在上述 发送解调导频的位置上发送用户数据。
以下对本发明进行举例阐述。
如图 1所示, 本发明的导频发送方法的原理实现流程包括以下步骤: 步骤 101、发送控制信令, 该控制信令中设置子帧触发或不触发解调导 频发送。
步骤 102、 基站 /移动台根据设置的子帧触发或不触发解调导频发送, 有选择的在对应子帧上发送或不发送解调导频。
解调导频发送时的导频实例如下面各个实施例所示:
实施例 1 :
假设在上行信号中的子帧 0、子帧 2和子帧 3中当上行解调导频被触发, 上行信号循环前缀(CP, Cyclic Prefix )长度为正常长度, UE设定为在上 行子帧的第 1个时隙和第 2个时隙的第 4个 OFDM符号发送上行解调导频, 此时发送的导频图案如图 2所示。 子帧 1没有触发上行解调导频, 因此子 帧 1的导频发送位置用来发送用户上行数据。 图 2中, 示解调导频发 送的导频信号所在位置; I _ I表示用户数据发送的用户数据所在位置。
实施例 2:
假设在上行信号中的子帧 0、子帧 2和子帧 3中当上行解调导频被触发, 上行信号 CP长度为正常长度, UE设定为在上行子帧的第 1个时隙的最后 一个 OFDM符号发送上行解调导频, 此时发送的导频图案如图 3所示。 子 帧 1没有触发上行解调导频, 因此子帧 1的导频发送位置用来发送用户上 行数据。 图 3中, 表示解调导频发送的导频信号所在位置; I表示用 户数据发送的用户数据所在位置。
实施例 3:
4叚设在下行信号中的子帧 0、子帧 2和子帧 3中所述当下行解调导频被 触发, 下行信号 CP长度为正常长度, 且设定基站使用天线端口 5发送下行 解调导频, 此时基站发送的导频图案如图 4所示。 子帧 1没有触发下行 调导频, 因此子帧 1的导频发送位置用来发送下行数据。 图 4中,
Figure imgf000010_0001
解调导频发送的导频信号所在位置; I _ I表示用户数据发送的用户数据所在 位置。
实施例 4:
假设在下行信号中的子帧 0、子帧 1和子帧 3中当下行解调导频被触发, 下行信号 CP长度为扩展长度,且设定基站使用天线端口 5发送下行解调导 频, 此时基站发送的导频图案如图 5所示。 子帧 2没有触发下行解调导频, 因此子帧 2的导频发送位置用来发送下行数据。 图 5中, 表示解调导频 发送的导频信号所在位置; I表示用户数据发送的用户数据所在位置 ( 实施例 5:
假设在上行信号中的子帧 0、子帧 2和子帧 3中当上行解调导频被触发, 上行信号 CP长度为正常长度, UE设定为在上行子帧的第 1个时隙和第 2 个时隙的第 4个 OFDM符号发送上行解调导频, 且 UE使用频分的方法发 送两个正交导频信号, 此时发送的导频图案如图 6所示。 图 6中不同的导 频信号被放置在一个符号里面的不同频率的子载波上。 图中子帧 1 没有触 发上行解调导频, 因此子帧 1的导频发送位置用来发送用户上行数据。 图 6 中, 表示解调导频发送的导频信号 1所在位置; 表示解调导频发送 的导频信号 2所在位置; I _ I表示用户数据发送的用户数据所在位置。
实施例 6:
假设在上行信号中的子帧 0、子帧 2和子帧 3中当上行解调导频被触发, 上行信号 CP长度为正常长度, UE设定为在上行子帧的第 1个时隙和第 2 个时隙的第 4个 OFDM符号发送上行解调导频, 且 UE使用码分的方法发 送两个正交导频信号, 此时发送的导频图案如图 7所示。 图 7中不同的导 频信号被放置在相同的时频资源上, 使用不同的正交码来进行区分。 图 7 中子帧 1没有触发上行解调导频, 因此子帧 1的导频发送位置用来发送用 户上行数据。 图 7中, 示图 7中解调导频发送的导频信号 1和导频信 号 2叠加所在位置; I _ I表示用户数据发送的用户数据所在位置。 实施例 7:
假设 eNB通过高层配置, 设置 UE在上行信号中的子帧 0、 子帧 2中 发送上行解调导频, 上行信号循环前缀(CP, Cyclic Prefix )长度为正常长 度, UE设定为在上行子帧的第 1个时隙和第 2个时隙的第 4个 OFDM符 号发送上行解调导频, 此时发送的导频图案如图 8所示。 子帧 1和子帧 3 没有触发上行解调导频, 因此子帧 1和子帧 3的导频发送位置用来发送用 户上行数据。 图 8中,
Figure imgf000012_0001
I _ I表 示用户数据发送的用户数据所在位置。
一种导频的发送***, 该***包括: 导频选择发送单元, 导频选择发 送单元用于根据控制信令中子帧触发或不触发解调导频发送的设置, 有选 择的在对应子帧上发送或不发送解调导频。
这里, 子帧触发或不触发解调导频发送的设置具体包括: 通过控制信 令中的指示方式实现; 指示方式为: 基站通过控制信令指示分配给移动台 的资源中是否发送解调导频。
这里, 导频选择发送单元进一步用于当所述基站分配给移动台的资源 具体为上行资源且基站通过控制信令指示触发解调导频在上行子帧中发送 的情况下, 移动台发送解调导频时, 所述解调导频是在分配资源所属上行 子帧的专用的固定符号位置的部分或全部子载波上发送。
该***还包括用户数据发送单元, 用于当所述基站分配给移动台的资 源具体为上行资源且基站通过控制信令没有触发解调导频在上行子帧中发 送的情况下, 移动台在分配资源所属上行子帧的专用的固定符号位置上发 送用户数据。
这里, 固定符号位置具体为: 子帧的第 1个时隙的最后 1个 OFDM符 号; 或者, 当上行符号循环前缀长度为普通长度时, 所述固定符号位置具 体为: 子帧的第 1个时隙和第 2个时隙的第 4个 OFDM符号; 或者, 当上 行符号循环前缀长度为扩展长度时, 所述固定符号位置具体为: 子帧的第 1 个时隙和第 2个时隙的第 3个 OFDM符号。
这里, 导频选择发送单元进一步用于当所述基站分配给移动台的资源 具体为下行资源且基站通过控制信令触发解调导频在下行子帧中发送的情 况下, 基站发送解调导频时, 所述解调导频是在分配资源所属下行子帧中 的固定时频位置上发送。
该***还包括用户数据发送单元, 用于当所述基站分配给移动台的资 源具体为下行资源且基站通过控制信令指示没有触发解调导频在下行子帧 中发送情况下, 基站在分配资源所属下行子帧中的固定时频位置上发送用 户数据。
以上所述, 仅为本发明的较佳实施例而已, 并非用于限定本发明的保 护范围。

Claims

权利要求书
1、 一种导频的发送方法, 其特征在于, 该方法包括: 根据控制信令中 子帧触发或不触发解调导频发送的设置, 有选择的在对应子帧上发送或不 发送解调导频。
2、 根据权利要求 1所述的方法, 其特征在于, 所述子帧触发或不触发 解调导频发送的设置包括: 通过控制信令中的指示方式实现; 所述指示方 式为: 基站通过控制信令指示分配给移动台的资源中是否发送解调导频。
3、 根据权利要求 2所述的方法, 其特征在于, 当业务类型为半静态持 续调度业务时, 所述指示方式为: 基站通过高层信令指示在哪些子帧发送 解调导频。
4、 根据权利要求 2所述的方法, 其特征在于, 当业务类型为动态调度 业务时,所述指示方式为:基站通过设置物理控制信道的相应比特为 1或 0, 指示在子帧中触发或不触发解调导频的发送。
5、 根据权利要求 2所述的方法, 其特征在于, 当所述基站分配给移动 台的资源为上行资源且基站通过控制信令指示触发解调导频在上行子帧中 发送时, 该方法还包括: 移动台发送解调导频时, 所述解调导频是在分配 资源所属上行子帧的专用的固定符号位置的部分或全部子载波上发送; 当所述基站分配给移动台的资源为上行资源且基站通过控制信令指示 不触发解调导频在上行子帧中发送时, 该方法还包括: 移动台在分配资源 所属上行子帧的专用的固定符号位置上发送用户数据。
6、 根据权利要求 5所述的方法, 其特征在于, 所述固定符号位置为: 子帧的第 1个时隙的最后 1个 OFDM符号; 或者,
当上行符号循环前缀长度为普通长度时, 所述固定符号位置为: 子帧 的第 1个时隙和第 2个时隙的第 4个 OFDM符号; 或者,
当上行符号循环前缀长度为扩展长度时, 所述固定符号位置为: 子帧 的第 1个时隙和第 2个时隙的第 3个 OFDM符号。
7、 根据权利要求 2所述的方法, 其特征在于, 当所述基站分配给移动 台的资源为下行资源且基站通过控制信令指示触发解调导频在下行子帧中 发送时, 该方法还包括: 基站发送解调导频时, 所述解调导频是在分配资 源所属下行子帧中的固定时频位置上发送;
当所述基站分配给移动台的资源为下行资源且基站通过控制信令指示 不触发解调导频在下行子帧中发送时, 该方法还包括: 基站在分配资源所 属下行子帧中的固定时频位置上发送用户数据。
8、 一种导频的发送***, 其特征在于, 该***包括: 导频选择发送单 元, 用于根据控制信令中子帧触发或不触发解调导频发送的设置, 有选择 的在对应子帧上发送或不发送解调导频。
9、 根据权利要求 8所述的***, 其特征在于, 所述子帧触发或不触发 解调导频发送的设置包括: 通过控制信令中的指示方式实现; 所述指示方 式为: 基站通过控制信令指示分配给移动台的资源中是否发送解调导频。
10、 根据权利要求 9所述的***, 其特征在于, 所述导频选择发送单 元, 进一步用于当所述基站分配给移动台的资源为上行资源且基站通过控 制信令指示触发解调导频在上行子帧中发送的情况下, 移动台发送解调导 频时, 所述解调导频是在分配资源所属上行子帧的专用的固定符号位置的 部分或全部子载波上发送;
该***还包括用户数据发送单元, 用于当所述基站分配给移动台的资 源为上行资源且基站通过控制信令指示不触发解调导频在上行子帧中发送 的情况下, 移动台在分配资源所属上行子帧的专用的固定符号位置上发送 用户数据。
11、根据权利要求 10所述的***, 其特征在于, 所述固定符号位置为: 子帧的第 1个时隙的最后 1个 OFDM符号; 或者, 当上行符号循环前缀长度为普通长度时, 所述固定符号位置为: 子帧 的第 1个时隙和第 2个时隙的第 4个 OFDM符号; 或者,
当上行符号循环前缀长度为扩展长度时, 所述固定符号位置为: 子帧 的第 1个时隙和第 2个时隙的第 3个 OFDM符号。
12、 根据权利要求 9所述的***, 其特征在于, 所述导频选择发送单 元, 进一步用于当所述基站分配给移动台的资源为下行资源且基站通过控 制信令指示触发解调导频在下行子帧中发送的情况下, 基站发送解调导频 时, 所述解调导频是在分配资源所属下行子帧中的固定时频位置上发送; 该***还包括用户数据发送单元, 用于当所述基站分配给移动台的资 源为下行资源且基站通过控制信令指示不触发解调导频在下行子帧中发送 的情况下, 基站在分配资源所属下行子帧中的固定时频位置上发送用户数 据。
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