WO2015109824A1 - 一种信道切换同步传输的方法及站点设备 - Google Patents

一种信道切换同步传输的方法及站点设备 Download PDF

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Publication number
WO2015109824A1
WO2015109824A1 PCT/CN2014/084479 CN2014084479W WO2015109824A1 WO 2015109824 A1 WO2015109824 A1 WO 2015109824A1 CN 2014084479 W CN2014084479 W CN 2014084479W WO 2015109824 A1 WO2015109824 A1 WO 2015109824A1
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Prior art keywords
channel
specific time
agreed
data
site
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PCT/CN2014/084479
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English (en)
French (fr)
Inventor
杨丹
邢卫民
李楠
韩志强
田开波
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中兴通讯股份有限公司
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Publication of WO2015109824A1 publication Critical patent/WO2015109824A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W56/00Synchronisation arrangements
    • H04W56/001Synchronization between nodes
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access
    • H04W74/08Non-scheduled access, e.g. ALOHA
    • H04W74/0808Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]

Definitions

  • the present invention relates to the field of wireless communications, and in particular to a method for notifying a parameter such as a wireless channel and its bandwidth in a wireless local area network WLAN or a wireless personal area network communication WPAN.
  • the wireless spectrum used by the IEEE standard includes not only the traditional 2.4 GHz, 5 GHz band, and below 1 GHz band, but also the millimeter wave bands such as 60 GHz and 45 GHz.
  • a master node and a plurality of child nodes are generally used.
  • the master node may be a well-known base station, an access point AP, a piconet control node, a PNC, or the like.
  • the child node may be a terminal UE, a wireless station, or the like.
  • a central node AP/PCP access point/personal basic service set (PBSS) control point
  • STAs multiple stations
  • BSS basic service set
  • the related art millimeter wave WLAN operates in the 60 GHz band, and its channel division is as shown in FIG. 1.
  • the BSS will select a channel operation in FIG. 1, and the channelization scheme only supports one channel bandwidth, BSS management control signaling and Data is transmitted on the selected channel.
  • the control of medium access includes two basic methods, one is based on competition and the other is based on scheduling.
  • the related art millimeter wave WLAN standard also uses these two methods to carry out the medium.
  • the AP/PCP establishes a BSS on a channel in the 60 GHz band (the bandwidth of the channel is fixed at 2.16 GHz), and the signaling is sent through a signal such as a Beacon or an Announcement frame for a predefined period of time on the channel.
  • the time period can be divided into the competition period CBAP to allow the station to transmit data through the CSMA/CA mechanism to compete for the channel, or to divide the time period into an exclusive service period SP without competition, so that the specific station can perform during this time.
  • Data transmission, other stations can not access the channel, the above data transmission can be between sites or between the site and the PCP/AP.
  • millimeter wave technology introduces new bands.
  • New The channel division of the introduced millimeter wave band has a new characteristic of variable channel bandwidth.
  • each channel has a fixed bandwidth, and the channel bandwidth value of the new frequency band has various options, for example, 540 MHz, 1080 MHz, and the like. It can be seen that in the prior art, channel resources are divided based on the time dimension on a fixed bandwidth, and the resource partitioning manner of the new frequency band cannot implement flexible bandwidth operations.
  • the AP/PCP allocates an SP to a pair of sites.
  • the AP/PCP allocates the SP, it notifies the sending station's identifier (ID) and the receiving station's identifier.
  • the sending station STA1 Data can be sent to the receiving station STA2.
  • STA1 starts to monitor whether the channel is idle for a period of time before the SP starts on the primary channel (ie, whether the detected signal energy exceeds a threshold, if it is exceeded, it indicates busy, otherwise the indication is idle), STA1 defaults to The channel containing the primary channel transmits data to STA2, and STA2 starts listening to the channel receiving data by default for a period of time before the SP starts on the channel containing the primary channel.
  • STA1 monitors that the primary channel is busy, even if the secondary channel is idle, STA1 will continue to listen to the primary channel until the primary channel is idle, and will access the channel to transmit data, which may further cause data transmission in the allocated SP. As a result, the channel utilization rate is not high.
  • the technical problem to be solved by the embodiments of the present invention is to provide a method for channel switching synchronous transmission and a station device, so as to improve channel utilization and ensure synchronous transmission between the receiver and the sender.
  • an embodiment of the present invention discloses a method for channel switching synchronous transmission, including:
  • the transmitting station monitors the agreed channel. If the agreed first channel is busy and the second channel is idle, the sending station sends data on the second channel after the first specific time after the start time of the service period.
  • the agreed channel is a channel pre-assigned to the sending station to send data to the receiving station.
  • the first specific time is predefined, or the access point is broadcasted, or the receiver negotiates with the sender.
  • the first channel is a primary channel, and the second channel is a secondary channel; or
  • the first channel is a secondary channel, and the second channel is a primary channel.
  • the receiving station monitors the first channel, and if the wireless frame from the sending station is not received within the second specific time, the receiving station is in the second after the second specific time Receive data on the channel.
  • the second specific time is predefined, or the access point is broadcasted, or the receiver negotiates with the sender.
  • the first specific time is greater than or equal to the second specific time.
  • a site device comprising:
  • a first monitoring unit configured to: monitor an agreed channel when the site device is a transmitting site
  • a sending unit configured to: when the agreed first channel is busy and the second channel is idle, transmitting data on the second channel after the first specific time after the start time of the service period.
  • the agreed channel is a channel pre-assigned to the sending station to send data to the receiving station.
  • the first specific time is predefined, or the access point is broadcasted, or the receiver negotiates with the sender.
  • the first channel is a primary channel
  • the second channel is a secondary channel
  • the first channel is a secondary channel
  • the second channel is a primary channel
  • the foregoing apparatus further includes:
  • a second monitoring unit configured to: monitor the first channel of the appointment when the device at the site is the receiving site;
  • a receiving unit configured to: if the wireless frame from the transmitting station is not received within the second specific time, receive data on the second channel after the second specific time.
  • the second specific time is predefined, or the access point is broadcasted, or the receiver negotiates with the sender.
  • the first specific time is greater than or equal to the second specific time.
  • Embodiments of the present invention also provide a computer program, including program instructions, when the program instructions are When the site device is executed, the site device is caused to perform the above method.
  • Embodiments of the present invention also provide a carrier carrying the above computer program.
  • the wireless network flexibly utilizes the idle channel, thereby improving channel utilization, and simultaneously ensuring that the wireless station performs synchronous transmission on the idle channel.
  • FIG. 1 is a schematic diagram of channel division of a related art
  • FIG. 2 is a flowchart of a method for channel switching synchronous transmission according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a channel switching synchronous transmission in a scenario according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of synchronous transmission of channel switching in scenario 2 according to an embodiment of the present invention.
  • the inventors of the present invention have considered that the new channel division in the millimeter wave band has a new characteristic that the channel bandwidth is variable, and the channel utilization of the related art access control method is not high, and proposes an improvement in channel utilization and can guarantee
  • the method for synchronous transmission between the receiver and the sender includes the following steps:
  • the transmitting station listens to the agreed channel. If the agreed first channel is busy and the second channel is idle, the transmitting station transmits data on the second channel after the first specific time after the start time of the service period.
  • the access point allocates a service period and an agreed channel for the receiver (ie, the receiving station) and the sender (ie, the transmitting station), so that the receiving party and the transmitting party listen to the first agreement.
  • the channel and the second channel are sufficient.
  • the first channel may also be referred to as a primary channel, and the second channel is referred to as a secondary channel.
  • the first channel may be referred to as a secondary channel, and at this time, the second channel is referred to as a primary channel.
  • the sender transmits data to the receiver on the first channel and the second channel at the beginning of the service period.
  • the sender If the sender hears that the first channel is idle and the second channel is busy, the sender transmits data to the receiver on the first channel at the beginning of the service period.
  • the sender If the sender hears that the first channel is busy and the second channel is idle, the sender sends data to the receiver on the second channel after the first specific time after the start of the service period.
  • the sender If the sender hears that both the first channel and the second channel are busy, the sender does not transmit data or continues to listen to the channel.
  • the receiver will listen to the agreed channel, and if the receiver receives the data from the sender on the agreed first channel within the second specific time, the receiver can receive the data.
  • the recipient does not receive data from the sender on the agreed first channel within the second specific time, the recipient receives the data on the agreed second channel after the second specific time.
  • the first specific time is greater than or equal to the second specific time.
  • the AP/PCP allocates an SP to STA1 to transmit data to STA2, and the assigned channel numbers are CH1 and CH2, where CH1 is the primary channel (ie, the first channel), CH2 is the secondary channel (ie, the second channel), and the AP/PCP A predefined time T1 of the reception delay channel switching is notified, which is the time dotl 1 SPIdleTimeout at which the station expects to receive the radio frame from the peer station.
  • STA1 starts to monitor whether the channel is idle on cm and CH2, STAI monitors cm busy on cm, but detects that CH2 is idle, then STA1 starts at SP start time. Timing, data is sent on CH2 after a time greater than or equal to one T1. STA2 starts monitoring signal on CH1 before the start of SP. If no radio frame from STA1 is detected within T1 after SP starts, STA2 can receive wireless from STA1 on CH2 when T1 arrives. frame. The whole process is shown in Figure 3. Scene two
  • the AP/PCP allocates an SP to STA1 to transmit data to STA2, and the assigned channel numbers are CH1 and CH2, where CH1 is the primary channel and CH2 is the secondary channel.
  • STA1 monitors whether the channel is idle on CH1 and CH2, STA1 monitors cm busy on CH2, but detects that cm is idle, then STAI is greater than or equal to one receiving delay channel switching time.
  • T1 the data will be sent on CH1, where T1 is 0, that is, STA2 can send data immediately on cm.
  • the minimum listening time of STA2 before the start of the SP starts to monitor the signal on cm, and receives the radio frame from STA1 at the start of the SP. The whole process is shown in Figure 4.
  • the AP/PCP allocates an SP to STA1 to transmit data to STA2.
  • the assigned channel numbers are CH1 and CH2, where CH1 is the primary channel and CH2 is the secondary channel, and STA1 and STA2 negotiate an access delay channel switch before the SP starts. Time Tl.
  • STA1 starts to monitor whether the channel is idle on cm and CH2, STAI monitors cm busy on cm, but detects that CH2 is idle, then STA1 starts at SP start time. Timing, data is sent on CH2 after a time greater than or equal to one T1. STA2 starts monitoring signal on CH1 before the start of SP. If no radio frame from STA1 is detected within T1 after SP starts, STA2 can transfer to CH2 before waiting for T1 to wait for receiving from STA1. Wireless frame.
  • STA1 monitors that both CH1 and CH2 are idle during the listening period, at the start of the SP, STA1 transmits data to STA2 on the channel containing CH1, and STA2 receives the data on the channel containing cm.
  • STA1 If STA1 is listening to both CH1 and CH2 during the listening period, STA1 does not send data at the start of SP.
  • the AP/PCP allocates an SP to STA1 to transmit data to STA2, and the assigned channel numbers are CH1 and CH2, where CH1 is the primary channel, CH2 is the secondary channel, and the AP/PCP notifies a predefined reception delay channel switch.
  • Time T1 the time T1 is the time at which the station expects to receive the radio frame from the peer station, dotl 1 SPIdleTimeout.
  • STA1 starts to monitor whether the channel is idle on CH1 and CH2, and STA1 monitors that both CH1 and CH2 are busy, STA1 does not send data and continues to monitor the channel.
  • STA2 does not receive any data from STA1 within the T1 time after the SP start time. STA2 switches to CH2 when T1 arrives. If STA2 continues to wait for T1 time in CH2, there is still no signal, STA2 can Transfer to cm to receive the data, and repeat the operation until the data sent from STA1 is received.
  • the embodiment provides a site device, which can implement the method of Embodiment 1 above, and includes at least the following units.
  • the first monitoring unit monitors the agreed channel when the device at the site is the transmitting station
  • the agreed channel is a channel pre-assigned to the transmitting station to send data to the receiving station. And sending, when the agreed first channel is busy and the second channel is idle, transmitting data on the second channel after the first specific time after the start time of the service period.
  • the first channel may also be referred to as a primary channel, and the second channel is referred to as a secondary channel.
  • the first channel can also be referred to as a secondary channel.
  • the second channel is referred to as a primary channel.
  • the first specific time mentioned above is predefined, or broadcast by the access point, or negotiated by the receiver with the sender.
  • the above site device can also serve as a receiving site.
  • the device further includes: a second monitoring unit, when the site is a receiving site, listening to the agreed first channel; and receiving, if the wireless frame from the sending site is not received within the second specific time, Data is received on the second channel after a second specific time.
  • the second specific time is predefined, or is broadcast by the access point, or is negotiated between the receiver and the sender. It should also be noted that the first specific time referred to above is greater than or equal to the second specific time.
  • the embodiment of the present invention further provides a computer program, including program instructions, when the program instruction is executed by a site device, so that the site device can perform the above method.
  • Embodiments of the present invention also provide a carrier carrying the above computer program.
  • the wireless network flexibly utilizes the idle channel, thereby improving channel utilization, and at the same time ensuring that the wireless station performs synchronous transmission on the idle channel.

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Abstract

本发明实施例公开了一种信道切换同步传输的方法及站点设备,涉及无线通信领域,该方法包括:发送站点监听约定信道,若约定的第一信道忙且第二信道空闲,则所述发送站点在服务期起始时刻后的第一特定时间后在第二信道上发送数据。

Description

一种信道切换同步传输的方法及站点设备 技术领域
本发明涉及无线通信领域, 具体地, 涉及无线局域网 WLAN或无线个域 网通信 WPAN中, 无线信道及其带宽等参数的通知方法。
背景技术
目前, 随着用户需求的增长, 对 WLAN或者 WPAN的传输速率的需求 日益增长, 电气和电子工程师协会 IEEE为了满足这一需求,成立了专门的任 务组, 以实现高速数据速率。 IEEE标准使用的无线频谱不但包括了传统的 2.4GHz , 5GHz频段 , 1 GHz以下频段 , 还包括了 60GHz和 45GHz等毫米波 频段。
无线网络中, 一般由一个主节点和多个子节点组成, 上述主节点可以是 熟知的基站, 接入点 AP, 微微网控制节点 PNC等设备, 子节点可以是终端 UE,无线站点等设备。在毫米波 WLAN中,一个中心节点 AP/PCP( access point/ personal basic service set (PBSS) control point ) 以及与之相关联的多个站点 ( Station, 简称 STA )组成了一个基本服务集 ( basic service set, 简称 BSS )。
相关技术的毫米波 WLAN工作在 60GHz频段, 其信道划分如图 1所示, BSS会在图 1中选定一个信道工作,该信道化方案只支持一种信道带宽, BSS 的管理控制信令和数据都在选定的信道上传输。 现有无线网络中, 对于媒介 接入的控制包括两种基本方式, 一种是基于竟争的, 一种是基于调度的, 相 关技术的毫米波 WLAN标准中也综合使用这两种方式进行媒介接入控制,例 如, AP/PCP在 60GHz频段上的一个信道上建立 BSS (该信道的带宽固定为 2.16GHz), 在这个信道上预定义的时间期通过 Beacon或 Announcement帧等 信令的发送, 可以将一段时间划分为竟争期 CBAP让站点通过 CSMA/CA机 制竟争信道进行数据传输, 也可以将一段时间划分为一个没有竟争的专属服 务期 SP, 让特定站点在这段时间内进行数据传输, 其他站点不能接入信道, 上述数据传输可以是站点之间也可以是站点和 PCP/AP之间。 为了促进毫米 波技术的使用并满足用户对数据速率的要求, 毫米波技术引入了新波段。 新 引入的毫米波波段的信道划分具有了信道带宽可变的新特性, 原来每个信道 带宽固定, 而新频段信道带宽值有多种选择, 例如, 540MHz、 1080MHz等。 可以看出现有技术中在固定带宽上基于时间维度将信道资源进行划分, 对于 新频段这种资源划分方式无法实现灵活的带宽操作。
例如 AP/PCP分配一个 SP给一对站点 , AP/PCP在分配该 SP时 ,会通知 发送站点的标识符(identifier, 简称 ID )和接收站点的标识符, 在该 SP内, 发送站点 STA1就可以向接收站点 STA2发送数据。 STA1在主信道上 SP开 始前的一段时间内开始监听信道是否空闲 (即所检测到的信号能量是否超过 一个门限值, 如果超过了, 则指示为忙, 否则指示为空闲), STA1默认在包 含主信道的信道上向 STA2发送数据, STA2默认在包含主信道的信道上 SP 开始前的一段时间内开始监听信道接收数据。 如果 STA1监听到主信道忙, 即使辅信道空闲, STA1仍然会继续监听主信道, 直到主信道空闲, 才会接入 信道发送数据,有可能会进一步造成在所分配的 SP内无法完成数据传输, 由 此导致信道利用率不高。
发明内容
本发明实施例所要解决的技术问题是, 提供一种信道切换同步传输的方 法及站点设备, 以提高信道利用率且能保证接收方和发送方同步传输。
为了解决上述技术问题, 本发明实施例公开了一种信道切换同步传输的 方法, 包括:
发送站点监听约定信道, 若约定的第一信道忙且第二信道空闲, 则所述 发送站点在服务期起始时刻后的第一特定时间后在第二信道上发送数据。
可选地, 上述方法中, 所述约定信道为预分配给所述发送站点向接收站 点发送数据的信道。
可选地, 上述方法中, 所述第一特定时间是预定义的、 或者是接入点广 播的、 或者是接收方与发送方协商的。
可选地, 上述方法中, 所述第一信道为主信道, 所述第二信道为辅信道; 或者 所述第一信道为辅信道, 所述第二信道为主信道。
可选地, 上述方法中, 接收站点监听所述第一信道, 若在第二特定时间 内没有接收到来自发送站点的无线帧, 则所述接收站点在第二特定时间后在 所述第二信道上接收数据。
可选地, 上述方法中, 所述第二特定时间是预定义的、 或者是接入点广 播的、 或者是接收方与发送方协商的。
可选地, 上述方法中, 所述第一特定时间大于或等于所述第二特定时间。 本发明还公开了一种站点设备, 包括:
第一监听单元, 其设置为: 在本站点设备为发送站点时, 监听约定信道; 以及
发送单元, 其设置为: 在约定的第一信道忙且第二信道空闲时, 在服务 期起始时刻后的第一特定时间后在第二信道上发送数据。
可选地, 上述设备中, 所述约定信道为预分配给所述发送站点向接收站 点发送数据的信道。
可选地, 上述设备中, 所述第一特定时间是预定义的、 或者是接入点广 播的、 或者是接收方与发送方协商的。
可选地, 上述设备中, 所述第一信道为主信道, 所述第二信道为辅信道; 或者
所述第一信道为辅信道, 所述第二信道为主信道。
可选地, 上述设备还包括:
第二监听单元, 其设置为: 在本站点设备为接收站点时, 监听约定的第 一信道; 以及
接收单元, 其设置为: 若在第二特定时间内没有接收到来自发送站点的 无线帧, 则在第二特定时间后在所述第二信道上接收数据。
可选地, 上述设备中, 所述第二特定时间是预定义的、 或者是接入点广 播的、 或者是接收方与发送方协商的。
可选地, 上述设备中, 所述第一特定时间大于或等于所述第二特定时间。 本发明实施例还提供一种计算机程序, 包括程序指令, 当该程序指令被 站点设备执行时, 使得该站点设备可执行上述方法。 本发明实施例还提供一种载有上述计算机程序的载体。
通过本申请实施例的信道切换同步传输方案, 无线网络灵活的利用空闲 信道, 从而提高信道利用率, 同时可以保证无线站点在空闲信道上进行同步 传输。
附图概述
图 1为相关技术的信道划分示意图;
图 2为本发明实施例中信道切换同步传输方法流程图;
图 3为本发明实施例中场景一下信道切换同步传输示意图;
图 4为本发明实施例中场景二下信道切换同步传输示意图。
本发明的较佳实施方式
下文将结合附图对本发明实施例作详细说明。 需要说明的是, 在不冲突 的情况下 , 本申请的实施例和实施例中的特征可以任意相互组合。
实施例 1
本申请发明人考虑到毫米波波段的新的信道划分具有信道带宽可变的新 特性, 而相关技术的接入控制方法的信道利用率不高的问题, 提出一种提高 信道利用率且能保证接收方和发送方同步传输的方法, 包括以下步骤:
发送站点监听约定信道, 若约定的第一信道忙且第二信道空闲, 则发送 站点在服务期起始时刻后的第一特定时间后在第二信道上发送数据。
要说明的是, 实现上述方法之前, 是由接入点为接收方 (即接收站点) 和发送方 (即发送站点)分配服务期和约定信道, 这样, 接收方和放送方监 听约定的第一信道和第二信道即可。
其中, 第一信道也可称为主信道, 此时, 第二信道称为辅信道。 当然也 可以将第一信道称为辅信道, 此时, 第二信道称为主信道。
较佳地, 若发送方监听到第一信道和第二信道都空闲, 则发送方在服务 期起始时刻在第一信道和第二信道上向接收方发送数据。
若发送方监听到第一信道空闲, 而第二信道忙, 则发送方在服务期起始 时刻在第一信道上向接收方发送数据。
若发送方监听到第一信道忙, 而第二信道空闲, 则发送方在服务期起始 时刻后的第一特定时间后在第二信道上向接收方发送数据。
若发送方监听到第一信道和第二信道都为忙, 则发送方不发送数据或继 续监听信道。
相应地, 按照上述方法发送数据后, 接收方会监听约定信道, 若接收方 在第二特定时间内在约定的第一信道上接收到来自发送方的数据, 则接收方 接收数据即可。
若接收方在第二特定时间内在约定的第一信道上没有收到来自发送方的 数据, 则接收方在第二特定时间后在约定的第二信道上接收数据。
其中, 第一特定时间大于或等于第二特定时间。
上述方法的实现过程如图 2所示。
下面结合具体应用场景说明本实施例所述方案的具体实施过程。
场景一
AP/PCP分配一个 SP给 STA1传输数据给 STA2,所分配的信道号为 CH1 和 CH2, 其中 CH1为主信道(即第一信道), CH2为辅信道(即第二信道), 并且 AP/PCP会通知一个预定义好的接收延迟信道切换的时间 T1 , 该 T1时 间为站点期望接收到来自对等站的无线帧的时间 dotl 1 SPIdleTimeout。
在 SP起始时刻前的最小监听时间( aDMGPPMinListeningTime )处, STA1 在 cm和 CH2上开始监听信道是否空闲, STAI在 cm上监听到 cm忙, 但检测到 CH2空闲, 那么 STA1在 SP起始时刻开始计时, 到大于或等于一 个的 T1的时间后会在 CH2上发送数据。 STA2在 SP开始前的最小监听时间 在 CH1上开始监听信号,如果在 SP开始后的 T1时间内没有检测到来自 STA1 的无线帧,则 STA2可以在 T1时间到达时在 CH2上接收来自 STA1的无线帧。 整个过程如图 3所示。 场景二
AP/PCP分配一个 SP给 STA1传输数据给 STA2,所分配的信道号为 CH1 和 CH2, 其中 CH1为主信道, CH2为辅信道。 在 SP起始时刻前的最小监听 时间处, STA1在 CH1和 CH2上监听信道是否空闲, STA1在 CH2上监听到 cm忙, 但检测到 cm空闲, 那么 STAI在大于或等于一个接收延迟信道切 换时间 T1的时间后会在 CH1上发送数据, 此处 T1为 0, 也即 STA2可以在 cm上立即发送数据。 STA2在 SP开始前的最小监听时间在 cm上开始监听 信号, 并在 SP起始时刻接收来自 STA1的无线帧。 整个过程如图 4所示。
场景三
AP/PCP分配一个 SP给 STA1传输数据给 STA2,所分配的信道号为 CH1 和 CH2, 其中 CH1为主信道, CH2为辅信道,并且 SP开始前, STA1和 STA2 协商了一个接入延迟信道切换时间 Tl。
在 SP起始时刻前的最小监听时间( aDMGPPMinListeningTime )处, STA1 在 cm和 CH2上开始监听信道是否空闲, STAI在 cm上监听到 cm忙, 但检测到 CH2空闲, 那么 STA1在 SP起始时刻开始计时, 到大于或等于一 个的 T1的时间后会在 CH2上发送数据。 STA2在 SP开始前的最小监听时间 在 CH1上开始监听信号,如果在 SP开始后的 T1时间内没有检测到来自 STA1 的无线帧, 则 STA2可以在 T1时间到达前转移到 CH2上等待接收来自 STA1 的无线帧。
若 STA1在监听期监听到 CH1和 CH2都为空闲,则在 SP起始时刻, STA1 在包含 CH1的信道上向 STA2发送数据, STA2在包含 cm的信道上接收数 据。
若 STA1在监听期监听到 CH1和 CH2都为忙, 则在 SP起始时刻, STA1 不发送数据。
场景四
AP/PCP分配一个 SP给 STA1传输数据给 STA2,所分配的信道号为 CH1 和 CH2, 其中 CH1为主信道, CH2为辅信道, 并且 AP/PCP会通知一个预 定义好的接收延迟信道切换的时间 T1 , 该 T1时间为站点期望接收到来自对 等站的无线帧的时间 dotl 1 SPIdleTimeout。 在 SP起始时刻前的最小监听时间( aDMGPPMinListeningTime )处, STA1 在 CH1和 CH2上开始监听信道是否空闲, STA1监听到 CH1和 CH2都为忙, 则 STA1不发送数据并继续监听信道。 STA1在监听到信道忙后的 T2时间后 监听到主信道为空闲, 则 STA1通过判断 n=mod[T2 T1]是奇数还是偶数来判 断是在 CH1还是 CH2上发送数据, 其中 mod[T2 T1]表示 T2除以 T1取模。 n 为奇数, 则 STA1在辅信道上发送数据; n为偶数, 则 STA1在主信道上发送 数据。
STA2在 SP起始时刻后的 T1时间内, 没有收到任何来自 STA1 的任何 数据, 则 STA2在 T1到达时, 切换到 CH2上, 若 STA2在 CH2继续等待 T1 时间, 仍然没有信号, 则 STA2可以转移到 cm上接收数据, 并重复该操作, 直到接收到来自 STA1所发送的数据。
实施例 2
本实施例提供一种站点设备, 可实现上述实施例 1的方法, 其至少包括 如下各单元。
第一监听单元, 在本站点设备为发送站点时, 监听约定信道;
其中, 约定信道为预分配给所述发送站点向接收站点发送数据的信道。 发送单元, 在约定的第一信道忙且第二信道空闲时, 在服务期起始时刻 后的第一特定时间后在第二信道上发送数据。
其中, 第一信道也可称为主信道, 此时, 第二信道称为辅信道。 当然也 可以将第一信道称为辅信道, 此时, 第二信道称为主信道。
上述第一特定时间是预定义的、 或者是接入点广播的、 或者是接收方与 发送方协商的。
另外, 上述站点设备也可以作为接收站点。 此时, 该设备还包括: 第二监听单元, 在本站点为接收站点时, 监听约定的第一信道; 接收单元, 若在第二特定时间内没有接收到来自发送站点的无线帧, 则 在第二特定时间后在所述第二信道上接收数据。
其中, 第二特定时间是预定义的、 或者是接入点广播的、 或者是接收方 与发送方协商的。 还要说明的是, 上述涉及的第一特定时间大于或等于第二特定时间。 上述站点设备的其他操作可参见上述实施例 1的相应内容, 在此不再赘 述。 本发明实施例还提供一种计算机程序, 包括程序指令, 当该程序指令被 站点设备执行时, 使得该站点设备可执行上述方法。 本发明实施例还提供一种载有上述计算机程序的载体。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成, 所述程序可以存储于计算机可读存储介质中, 如只读 存储器、 磁盘或光盘等。 可选地, 上述实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地, 上述实施例中的各模块 /单元可以釆用 硬件的形式实现, 也可以釆用软件功能模块的形式实现。 本申请不限制于任 何特定形式的硬件和软件的结合。
以上所述, 仅为本发明的较佳实例而已, 并非用于限定本发明的保护范 围。 凡在本发明的精神和原则之内, 所做的任何修改、 等同替换、 改进等, 均应包含在本发明的保护范围之内。
工业实用性 通过本发明实施例的信道切换同步传输方案, 无线网络灵活的利用空闲 信道, 从而提高信道利用率, 同时可以保证无线站点在空闲信道上进行同步 传输。

Claims

权 利 要 求 书
1、 一种信道切换同步传输的方法, 包括:
发送站点监听约定信道, 若约定的第一信道忙且第二信道空闲, 则所述 发送站点在服务期起始时刻后的第一特定时间后在所述第二信道上发送数 据。
2、 如权利要求 1所述的方法, 其中,
所述约定信道为预分配给所述发送站点向接收站点发送数据的信道。
3、 如权利要求 1所述的方法, 其中,
所述第一特定时间是预定义的、 或者是接入点广播的、 或者是接收方与 发送方协商的。
4、 如权利要求 1所述的方法, 其中,
所述第一信道为主信道, 所述第二信道为辅信道; 或者
所述第一信道为辅信道, 所述第二信道为主信道。
5、 如权利要求 1至 4任一项所述的方法, 还包括:
所述接收站点监听所述第一信道, 若在第二特定时间内没有接收到来自 所述发送站点的无线帧, 则所述接收站点在所述第二特定时间后在所述第二 信道上接收数据。
6、 如权利要求 5所述的方法, 其中,
所述第二特定时间是预定义的、 或者是接入点广播的、 或者是接收方与 发送方协商的。
7、 如权利要求 6所述的方法, 其中,
所述第一特定时间大于或等于所述第二特定时间。
8、 一种站点设备, 包括:
第一监听单元, 其设置为: 在所述站点设备为发送站点时, 监听约定信 道; 以及
发送单元, 其设置为: 在约定的第一信道忙且第二信道空闲时, 在服务 期起始时刻后的第一特定时间后在第二信道上发送数据。
9、 如权利要求 8所述的设备, 其中,
所述约定信道为预分配给所述发送站点向接收站点发送数据的信道。
10、 如权利要求 8所述的设备, 其中,
所述第一特定时间是预定义的、 或者是接入点广播的、 或者是接收方与 发送方协商的。
11、 如权利要求 8所述的设备, 其中,
所述第一信道为主信道, 所述第二信道为辅信道; 或者
所述第一信道为辅信道, 所述第二信道为主信道。
12、 如权利要求 8至 11任一项所述的设备, 还包括:
第二监听单元, 其设置为: 在所述站点设备为接收站点时, 监听所述约 定的第一信道; 以及
接收单元, 其设置为: 若在第二特定时间内没有接收到来自发送站点的 无线帧, 则在所述第二特定时间后在所述第二信道上接收数据。
13、 如权利要求 12所述的设备, 其中,
所述第二特定时间是预定义的、 或者是接入点广播的、 或者是接收方与 发送方协商的。
14、 如权利要求 12所述的设备, 其中,
所述第一特定时间大于或等于所述第二特定时间。
15、 一种计算机程序, 包括程序指令, 当该程序指令被站点设备执行时, 使得该站点设备可执行权利要求 1-7任一项所述的方法。
16、 一种载有权利要求 15所述计算机程序的载体。
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