CN107852769B - Link self-adaption method of W L AN and network equipment - Google Patents

Link self-adaption method of W L AN and network equipment Download PDF

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CN107852769B
CN107852769B CN201580081538.2A CN201580081538A CN107852769B CN 107852769 B CN107852769 B CN 107852769B CN 201580081538 A CN201580081538 A CN 201580081538A CN 107852769 B CN107852769 B CN 107852769B
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于健
杨讯
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Huawei Technologies Co Ltd
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    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
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    • H04W84/02Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]

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Abstract

A link self-adapting method of W L AN and network equipment can improve the flexibility of channel information measurement and provide accurate link self-adaptation for users.

Description

一种WLAN的链路自适应方法及网络设备A WLAN link adaptation method and network device

技术领域technical field

本发明涉及通信技术领域,尤其涉及一种WLAN的链路自适应方法及网络设备。The present invention relates to the field of communication technologies, and in particular, to a WLAN link adaptation method and network equipment.

背景技术Background technique

在无线通信系统中,由于路损、衰落或者噪声等因素的影响,无线信道的信道信息通常会随时间的变化而变化。针对信道的这种时变特性,人们引入了链路自适应技术。其中,链路自适应技术是指系统根据当前获取的信道信息,自适应地调整系统传输参数的行为,用以克服或者适应当前信道变化带来的影响。从链路自适应技术的基本原理可以看出,链路自适应技术主要包含两方面的内容:一方面是信道信息的获取,即如何准确并有效地获得当前信道状况;另一方面是传输参数的调整,如MCS(Modulation and Coding Scheme,调制与编码策略)、发射功率以及时频资源等。目前,链路自适应技术凭借其在提高频谱利用率和数据传输速率方面的卓越性能赢得青睐,已成功应用于多种移动通信系统中,成为提高系统性能的关键技术之一。In a wireless communication system, due to the influence of factors such as path loss, fading, or noise, the channel information of a wireless channel usually changes with time. Aiming at this time-varying characteristic of the channel, link adaptation technology has been introduced. The link adaptation technology refers to the behavior of the system adaptively adjusting the transmission parameters of the system according to the currently acquired channel information, so as to overcome or adapt to the influence of the current channel change. From the basic principle of link adaptation technology, it can be seen that the link adaptation technology mainly includes two aspects: on the one hand, the acquisition of channel information, that is, how to obtain the current channel condition accurately and effectively; on the other hand, the transmission parameters adjustment, such as MCS (Modulation and Coding Scheme, modulation and coding strategy), transmit power and time-frequency resources. At present, link adaptation technology is favored by its excellent performance in improving spectrum utilization and data transmission rate, and has been successfully applied in various mobile communication systems, becoming one of the key technologies to improve system performance.

在现有WiFi(Wireless-Fidelity,无线保真)标准的链路自适应过程中,测量信道信息所使用的探测PPDU的模式相对比较单一,然而,随着下一代WiFi标准IEEE 802.11ax中室外场景、上行多用户传输等新特性的引入,单一模式的探测PPDU难以适配不同应用场景的不同需求,由此,IEEE 802.11ax对链路自适应过程中探测PPDU的选取也提出了更高的要求。In the link adaptation process of the existing WiFi (Wireless-Fidelity) standard, the mode of the probe PPDU used to measure the channel information is relatively simple. However, with the outdoor scene in the next-generation WiFi standard IEEE 802.11ax , the introduction of new features such as uplink multi-user transmission, it is difficult for a single mode of detection PPDU to adapt to the different needs of different application scenarios. Therefore, IEEE 802.11ax also puts forward higher requirements for the selection of detection PPDU in the process of link adaptation. .

发明内容SUMMARY OF THE INVENTION

本发明实施例提供了一种WLAN的链路自适应方法及网络设备,可提高信道信息测量的灵活度,为用户提供准确的链路自适应。Embodiments of the present invention provide a WLAN link adaptation method and network device, which can improve the flexibility of channel information measurement and provide users with accurate link adaptation.

本发明实施例的第一方面提供一种WLAN的链路自适应方法,包括:A first aspect of the embodiments of the present invention provides a WLAN link adaptation method, including:

第一网络设备获取目标信道信息测量结果,所述目标信道信息测量结果为根据目标模式的探测物理层协议数据单元PPDU测量信道信息得到的测量结果;The first network device acquires a target channel information measurement result, where the target channel information measurement result is a measurement result obtained by measuring the channel information according to the probing physical layer protocol data unit PPDU of the target mode;

所述第一网络设备根据所述目标信道信息测量结果进行链路自适应调整。The first network device performs link adaptive adjustment according to the target channel information measurement result.

结合本发明实施例的第一方面,在本发明实施例的第一方面的第一种实现方式中,所述第一网络设备获取目标信道信息测量结果包括:With reference to the first aspect of the embodiment of the present invention, in a first implementation manner of the first aspect of the embodiment of the present invention, the acquisition of the target channel information measurement result by the first network device includes:

所述第一网络设备向第二网络设备发送第一PPDU,其中,所述第一PPDU指示第二网络设备需要发送探测PPDU,且所述第一PPDU还包括模式指示字段,所述模式指示字段用于指示第二网络设备生成目标模式的探测PPDU;The first network device sends a first PPDU to the second network device, wherein the first PPDU indicates that the second network device needs to send a probe PPDU, and the first PPDU further includes a mode indication field, the mode indication field for instructing the second network device to generate a probe PPDU of the target mode;

所述第一网络设备接收所述第二网络设备发送的第二PPDU,其中,所述第二PPDU为所述第二网络设备根据所述模式指示字段生成的目标模式的探测PPDU;receiving, by the first network device, a second PPDU sent by the second network device, where the second PPDU is a probe PPDU of a target mode generated by the second network device according to the mode indication field;

所述第一网络设备使用所述第二PPDU测量信道信息,得到所述目标信道信息测量结果。The first network device uses the second PPDU to measure channel information to obtain the target channel information measurement result.

结合本发明实施例的第一方面,在本发明实施例的第一方面的第二种实现方式中,所述第一网络设备获取目标信道信息测量结果包括:With reference to the first aspect of the embodiment of the present invention, in a second implementation manner of the first aspect of the embodiment of the present invention, the acquisition of the target channel information measurement result by the first network device includes:

所述第一网络设备接收第二网络设备发送的PPDU;其中,所述PPDU指示第二网络设备主动发送信道信息测量结果,所述PPDU还包括模式指示字段,所述模式指示字段用于指示第二网络设备测量信道信息所使用的探测PPDU的模式;The first network device receives the PPDU sent by the second network device; wherein, the PPDU instructs the second network device to actively send the channel information measurement result, and the PPDU further includes a mode indication field, where the mode indication field is used to indicate the first 2. The mode of the probe PPDU used by the network device to measure the channel information;

所述第一网络设备根据所述模式指示字段确定目标信道信息测量结果。The first network device determines a target channel information measurement result according to the mode indication field.

结合本发明实施例的第一方面、第一方面的第一至第二种实现方式中的任意一种,在本发明实施例的第一方面的第三种实现方式中,探测PPDU的模式包括探测PPDU的带宽信息、探测PPDU采用室内模式还是室外模式、探测PPDU的长训练字段的傅里叶变化阶数信息以及探测PPDU的保护间隔信息中的至少一个。With reference to the first aspect of the embodiments of the present invention and any one of the first to second implementation manners of the first aspect, in the third implementation manner of the first aspect of the embodiments of the present invention, the mode of detecting the PPDU includes: At least one of the bandwidth information of the probe PPDU, the indoor mode or the outdoor mode of the probe PPDU, the Fourier transform order information of the long training field of the probe PPDU, and the guard interval information of the probe PPDU.

结合本发明实施例的第一方面的第一种实现方式,在本发明实施例的第一方面的第四种实现方式中,所述探测PPDU的模式包括探测PPDU采用室内模式还是室外模式;With reference to the first implementation manner of the first aspect of the embodiments of the present invention, in a fourth implementation manner of the first aspect of the embodiments of the present invention, the mode of detecting the PPDU includes detecting whether the PPDU adopts an indoor mode or an outdoor mode;

当所述模式指示字段指示第二网络设备生成室外模式的探测PPDU时,所述第二PPDU为所述第二网络设备根据所述模式指示字段生成的增强性的探测PPDU;When the mode indication field instructs the second network device to generate an outdoor mode probe PPDU, the second PPDU is an enhanced probe PPDU generated by the second network device according to the mode indication field;

其中,所述增强性的探测PPDU是指具有以下格式中的至少一种的探测PPDU:Wherein, the enhanced sounding PPDU refers to a sounding PPDU having at least one of the following formats:

所述探测PPDU的前导码的至少一个符号在时域或频域上进行部分或者全部的复制,所述探测PPDU的部分或全部符号间的保护间隔大于第一预设值,所述探测PPDU的至少一个符号的调制编码方式MCS满足某一预设条件,以及所述探测PPDU的至少一个符号的傅里叶变化阶数高于第二预设值。At least one symbol of the preamble of the sounding PPDU is partially or completely copied in the time domain or frequency domain, the guard interval between some or all symbols of the sounding PPDU is greater than the first preset value, and the The modulation and coding mode MCS of at least one symbol satisfies a certain preset condition, and the Fourier transform order of at least one symbol of the probe PPDU is higher than a second preset value.

结合本发明实施例的第一方面、第一方面的第一至第四种实现方式中的任意一种,在本发明实施例的第一方面的第五种实现方式中,所述信道信息包括信道的扩展延迟和/或多用户间的延迟;With reference to the first aspect of the embodiments of the present invention and any one of the first to fourth implementation manners of the first aspect, in a fifth implementation manner of the first aspect of the embodiments of the present invention, the channel information includes: Spread delay of the channel and/or delay between multiple users;

所述第一网络设备根据所述目标信道信息测量结果进行链路自适应调整包括:The link adaptation adjustment performed by the first network device according to the target channel information measurement result includes:

所述第一网络设备根据所述目标信道信息测量结果进行保护间隔的自适应调整。The first network device performs adaptive adjustment of the guard interval according to the target channel information measurement result.

结合本发明实施例的第一方面、第一方面的第一至第四种实现方式中的任意一种,在本发明实施例的第一方面的第六种实现方式中,所述信道信息包括信道的信噪比SNR;With reference to the first aspect of the embodiments of the present invention and any one of the first to fourth implementation manners of the first aspect, in a sixth implementation manner of the first aspect of the embodiments of the present invention, the channel information includes: The signal-to-noise ratio (SNR) of the channel;

所述第一网络设备根据所述目标信道信息测量结果进行链路自适应调整包括:The link adaptation adjustment performed by the first network device according to the target channel information measurement result includes:

所述第一网络设备根据所述目标信道信息测量结果进行调制编码策略MCS的自适应调整。The first network device performs adaptive adjustment of the modulation and coding strategy MCS according to the target channel information measurement result.

本发明实施例的第二方面提供一种WLAN的链路自适应方法,包括:A second aspect of the embodiments of the present invention provides a WLAN link adaptation method, including:

第二网络设备接收第一网络设备发送的第一PPDU;其中,所述第一PPDU指示第二网络设备需要发送探测PPDU,且所述第一PPDU还包括模式指示字段,所述模式指示字段用于指示第二网络设备生成目标模式的探测PPDU;The second network device receives the first PPDU sent by the first network device; wherein, the first PPDU indicates that the second network device needs to send a probe PPDU, and the first PPDU further includes a mode indication field, and the mode indication field is used for for instructing the second network device to generate a probe PPDU of the target mode;

所述第二网络设备根据所述模式指示字段生成目标模式的探测PPDU;The second network device generates a probe PPDU of the target mode according to the mode indication field;

所述第二网络设备向所述第一网络设备发送第二PPDU,其中,所述第二PPDU用于所述第一网络设备使用所述第二PPDU测量信道信息,得到所述目标信道信息测量结果,并根据所述目标信道信息测量结果进行链路自适应调整。The second network device sends a second PPDU to the first network device, where the second PPDU is used by the first network device to measure channel information using the second PPDU to obtain the target channel information measurement As a result, link adaptive adjustment is performed according to the target channel information measurement result.

结合本发明实施例的第二方面,在本发明实施例的第二方面的第一种实现方式中,探测PPDU的模式包括探测PPDU的带宽信息、探测PPDU采用室内模式还是室外模式、探测PPDU的长训练字段的傅里叶变化阶数信息以及探测PPDU的保护间隔信息中的至少一个。With reference to the second aspect of the embodiments of the present invention, in the first implementation manner of the second aspect of the embodiments of the present invention, the mode of detecting the PPDU includes detecting bandwidth information of the PPDU, detecting whether the PPDU adopts the indoor mode or the outdoor mode, and detecting the mode of the PPDU. At least one of Fourier transform order information of the long training field and guard interval information of the probe PPDU.

结合本发明实施例的第二方面,在本发明实施例的第二方面的第二种实现方式中,所述探测PPDU的模式包括探测PPDU采用室内模式还是室外模式;With reference to the second aspect of the embodiments of the present invention, in a second implementation manner of the second aspect of the embodiments of the present invention, the mode of detecting the PPDU includes detecting whether the PPDU adopts an indoor mode or an outdoor mode;

当所述模式指示字段指示第二网络设备生成室外模式的探测PPDU时,所述第二网络设备根据所述模式指示字段生成目标模式的探测PPDU包括:When the mode indication field instructs the second network device to generate the probe PPDU of the outdoor mode, the second network device generating the probe PPDU of the target mode according to the mode indication field includes:

所述第二网络设备根据所述模式指示字段生成增强性的探测PPDU;generating, by the second network device, an enhanced probe PPDU according to the mode indication field;

其中,所述增强性的探测PPDU是指具有以下格式中的至少一种的探测PPDU:Wherein, the enhanced sounding PPDU refers to a sounding PPDU having at least one of the following formats:

所述探测PPDU的前导码的至少一个符号在时域或频域上进行部分或者全部的复制,所述探测PPDU的部分或全部符号间的保护间隔大于第一预设值,所述探测PPDU的至少一个符号的调制编码方式MCS满足某一预设条件,以及所述探测PPDU的至少一个符号的傅里叶变化阶数高于第二预设值。At least one symbol of the preamble of the sounding PPDU is partially or completely copied in the time domain or frequency domain, the guard interval between some or all symbols of the sounding PPDU is greater than the first preset value, and the The modulation and coding mode MCS of at least one symbol satisfies a certain preset condition, and the Fourier transform order of at least one symbol of the probe PPDU is higher than a second preset value.

结合本发明实施例的第二方面、第二方面的第一至第二种实现方式中的任意一种,在本发明实施例的第二方面的第三种实现方式中,所述信道信息包括信道的扩展延迟和/或多用户间的延迟;With reference to the second aspect of the embodiments of the present invention and any one of the first to second implementation manners of the second aspect, in a third implementation manner of the second aspect of the embodiments of the present invention, the channel information includes Spread delay of the channel and/or delay between multiple users;

所述第二PPDU用于所述第一网络设备使用所述第二PPDU测量信道的扩展延迟和/或多用户间的延迟,并根据测量得到的信道的扩展延迟和/或多用户间的延迟进行保护间隔的自适应调整。The second PPDU is used by the first network device to measure the spread delay of the channel and/or the delay between multiple users by using the second PPDU, and obtain the spread delay of the channel and/or the delay between multiple users according to the measurement Adaptive adjustment of guard interval is performed.

结合本发明实施例的第二方面、第二方面的第一至第二种实现方式中的任意一种,在本发明实施例的第二方面的第四种实现方式中,With reference to the second aspect of the embodiments of the present invention and any one of the first to second implementation manners of the second aspect, in the fourth implementation manner of the second aspect of the embodiments of the present invention,

所述第二PPDU用于所述第一网络设备使用所述第二PPDU测量信道的SNR,并根据测量得到的信道的SNR进行MCS的自适应调整。The second PPDU is used by the first network device to measure the SNR of the channel by using the second PPDU, and perform adaptive adjustment of the MCS according to the measured SNR of the channel.

本发明实施例的第三方面提供一种WLAN的链路自适应方法,包括:A third aspect of the embodiments of the present invention provides a WLAN link adaptation method, including:

第二网络设备生成PPDU;其中,所述PPDU指示第二网络设备主动发送信道信息测量结果,所述PPDU还包括模式指示字段,所述模式指示字段用于指示第二网络设备测量信道信息所使用的探测PPDU的模式;The second network device generates a PPDU; wherein the PPDU instructs the second network device to actively send the channel information measurement result, and the PPDU further includes a mode indication field, where the mode indication field is used to indicate the second network device to use to measure the channel information The mode of the probe PPDU;

第二网络设备向第一网络设备发送所述PPDU,其中,所述PPDU用于所述第一网络设备根据所述模式指示字段确定目标信道信息测量结果,并根据所述目标信道信息测量结果进行链路自适应调整。The second network device sends the PPDU to the first network device, where the PPDU is used by the first network device to determine the target channel information measurement result according to the mode indication field, and perform the target channel information measurement result according to the target channel information measurement result. Link adaptive adjustment.

结合本发明实施例的第三方面,在本发明实施例的第三方面的第一种实现方式中,探测PPDU的模式包括探测PPDU的带宽信息、探测PPDU采用室内模式还是室外模式、探测PPDU的长训练字段的傅里叶变化阶数信息以及探测PPDU的保护间隔信息中的至少一个。With reference to the third aspect of the embodiments of the present invention, in the first implementation manner of the third aspect of the embodiments of the present invention, the mode of detecting the PPDU includes detecting the bandwidth information of the PPDU, detecting whether the PPDU adopts the indoor mode or the outdoor mode, and detecting the PPDU mode. At least one of Fourier transform order information of the long training field and guard interval information of the probe PPDU.

结合本发明实施例的第三方面或第三方面的第一种实现方式,在本发明实施例的第三方面的第二种实现方式中,所述信道信息包括信道的扩展延迟和/或多用户间的延迟;With reference to the third aspect of the embodiments of the present invention or the first implementation manner of the third aspect, in the second implementation manner of the third aspect of the embodiments of the present invention, the channel information includes the spreading delay of the channel and/or multiple delay between users;

所述PPDU用于所述第一网络设备根据所述模式指示字段确定目标信道信息测量结果,并根据所述目标信道信息测量结果进行保护间隔的自适应调整。The PPDU is used by the first network device to determine the target channel information measurement result according to the mode indication field, and to perform adaptive adjustment of the guard interval according to the target channel information measurement result.

结合本发明实施例的第三方面或第三方面的第一种实现方式,在本发明实施例的第三方面的第三种实现方式中,所述信道信息包括信道的信噪比SNR;With reference to the third aspect of the embodiments of the present invention or the first implementation manner of the third aspect, in a third implementation manner of the third aspect of the embodiments of the present invention, the channel information includes a signal-to-noise ratio SNR of the channel;

所述PPDU用于所述第一网络设备根据所述模式指示字段确定目标信道信息测量结果,并根据所述目标信道信息测量结果进行MCS的自适应调整。The PPDU is used by the first network device to determine a target channel information measurement result according to the mode indication field, and to perform adaptive adjustment of the MCS according to the target channel information measurement result.

本发明实施例的第四方面提供一种网络设备,包括:A fourth aspect of the embodiments of the present invention provides a network device, including:

获取单元,用于获取目标信道信息测量结果,所述目标信道信息测量结果为根据目标模式的探测物理层协议数据单元PPDU测量信道信息得到的测量结果;an acquisition unit, configured to acquire a target channel information measurement result, the target channel information measurement result being a measurement result obtained by measuring the channel information according to the probing physical layer protocol data unit PPDU of the target mode;

调整单元,用于根据所述目标信道信息测量结果进行链路自适应调整。An adjustment unit, configured to perform link adaptive adjustment according to the target channel information measurement result.

结合本发明实施例的第四方面,在本发明实施例的第四方面的第一种实现方式中,所述获取单元包括:With reference to the fourth aspect of the embodiment of the present invention, in a first implementation manner of the fourth aspect of the embodiment of the present invention, the obtaining unit includes:

发送模块,用于向目标网络设备发送第一PPDU,其中,所述第一PPDU指示目标网络设备需要发送探测PPDU,且所述第一PPDU还包括模式指示字段,所述模式指示字段用于指示目标网络设备生成目标模式的探测PPDU;A sending module, configured to send a first PPDU to a target network device, wherein the first PPDU indicates that the target network device needs to send a probe PPDU, and the first PPDU further includes a mode indication field, where the mode indication field is used to indicate The target network device generates a probe PPDU of the target mode;

第一接收模块,用于接收所述目标网络设备发送的第二PPDU,其中,所述第二PPDU为所述目标网络设备根据所述模式指示字段生成的目标模式的探测PPDU;a first receiving module, configured to receive a second PPDU sent by the target network device, where the second PPDU is a target mode probe PPDU generated by the target network device according to the mode indication field;

第一获取模块,用于使用所述第二PPDU测量信道信息,得到所述目标信道信息测量结果。A first obtaining module, configured to use the second PPDU to measure channel information to obtain the target channel information measurement result.

结合本发明实施例的第四方面,在本发明实施例的第四方面的第二种实现方式中,所述获取单元包括:With reference to the fourth aspect of the embodiment of the present invention, in a second implementation manner of the fourth aspect of the embodiment of the present invention, the obtaining unit includes:

第二接收模块,用于接收目标网络设备发送的PPDU;其中,所述PPDU指示目标网络设备主动发送信道信息测量结果,所述PPDU还包括模式指示字段,所述模式指示字段用于指示目标网络设备测量信道信息所使用的探测PPDU的模式;The second receiving module is configured to receive the PPDU sent by the target network device; wherein, the PPDU indicates that the target network device actively sends the channel information measurement result, and the PPDU further includes a mode indication field, and the mode indication field is used to indicate the target network The mode of the probe PPDU used by the device to measure the channel information;

第二获取模块,用于根据所述模式指示字段确定目标信道信息测量结果。The second acquiring module is configured to determine the target channel information measurement result according to the mode indication field.

结合本发明实施例的第四方面、第四方面的第一至第二种实现方式中的任意一种,在本发明实施例的第四方面的第三种实现方式中,探测PPDU的模式包括探测PPDU的带宽信息、探测PPDU采用室内模式还是室外模式、探测PPDU的长训练字段的傅里叶变化阶数信息以及探测PPDU的保护间隔信息中的至少一个。With reference to the fourth aspect of the embodiments of the present invention and any one of the first to second implementation manners of the fourth aspect, in the third implementation manner of the fourth aspect of the embodiments of the present invention, the mode of detecting the PPDU includes: At least one of the bandwidth information of the probe PPDU, the indoor mode or the outdoor mode of the probe PPDU, the Fourier transform order information of the long training field of the probe PPDU, and the guard interval information of the probe PPDU.

结合本发明实施例的第四方面的第一种实现方式,在本发明实施例的第四方面的第四种实现方式中,所述探测PPDU的模式包括探测PPDU采用室内模式还是室外模式;With reference to the first implementation manner of the fourth aspect of the embodiments of the present invention, in the fourth implementation manner of the fourth aspect of the embodiments of the present invention, the mode of detecting the PPDU includes detecting whether the PPDU adopts an indoor mode or an outdoor mode;

当所述模式指示字段指示目标网络设备生成室外模式的探测PPDU时,所述第二PPDU为所述目标网络设备根据所述模式指示字段生成的增强性的探测PPDU;When the mode indication field instructs the target network device to generate an outdoor mode probe PPDU, the second PPDU is an enhanced probe PPDU generated by the target network device according to the mode indicator field;

其中,所述增强性的探测PPDU是指具有以下格式中的至少一种的探测PPDU:Wherein, the enhanced sounding PPDU refers to a sounding PPDU having at least one of the following formats:

所述探测PPDU的前导码的至少一个符号在时域或频域上进行部分或者全部的复制,所述探测PPDU的部分或全部符号间的保护间隔大于第一预设值,所述探测PPDU的至少一个符号的调制编码方式MCS满足某一预设条件,以及所述探测PPDU的至少一个符号的傅里叶变化阶数高于第二预设值。At least one symbol of the preamble of the sounding PPDU is partially or completely copied in the time domain or frequency domain, the guard interval between some or all symbols of the sounding PPDU is greater than the first preset value, and the The modulation and coding mode MCS of at least one symbol satisfies a certain preset condition, and the Fourier transform order of at least one symbol of the probe PPDU is higher than a second preset value.

结合本发明实施例的第四方面、第四方面的第一至第四种实现方式中的任意一种,在本发明实施例的第四方面的第五种实现方式中,所述信道信息包括信道的扩展延迟和/或多用户间的延迟;With reference to the fourth aspect of the embodiments of the present invention and any one of the first to fourth implementation manners of the fourth aspect, in a fifth implementation manner of the fourth aspect of the embodiments of the present invention, the channel information includes: Spread delay of the channel and/or delay between multiple users;

所述调整单元,具体用于根据所述目标信道信息测量结果进行保护间隔的自适应调整。The adjustment unit is specifically configured to perform adaptive adjustment of the guard interval according to the target channel information measurement result.

结合本发明实施例的第四方面、第四方面的第一至第四种实现方式中的任意一种,在本发明实施例的第四方面的第六种实现方式中,所述信道信息包括信道的SNR;With reference to the fourth aspect of the embodiments of the present invention and any one of the first to fourth implementation manners of the fourth aspect, in the sixth implementation manner of the fourth aspect of the embodiments of the present disclosure, the channel information includes: SNR of the channel;

所述调整单元,具体用于根据所述目标信道信息测量结果进行调制编码策略MCS的自适应调整。The adjustment unit is specifically configured to perform adaptive adjustment of the modulation and coding strategy MCS according to the measurement result of the target channel information.

本发明实施例的第五方面提供一种网络设备,包括:A fifth aspect of the embodiments of the present invention provides a network device, including:

接收单元,用于接收目标网络设备发送的第一PPDU;其中,所述第一PPDU指示所述网络设备需要发送探测PPDU,且所述第一PPDU还包括模式指示字段,所述模式指示字段用于指示所述网络设备生成目标模式的探测PPDU;a receiving unit, configured to receive a first PPDU sent by a target network device; wherein, the first PPDU indicates that the network device needs to send a probe PPDU, and the first PPDU further includes a mode indication field, and the mode indication field is used for for instructing the network device to generate a probe PPDU of the target mode;

生成单元,用于根据所述模式指示字段生成目标模式的探测PPDU;a generating unit, configured to generate a probe PPDU of the target mode according to the mode indication field;

发送单元,用于向所述目标网络设备发送第二PPDU,其中,所述第二PPDU用于所述目标网络设备使用所述第二PPDU测量信道信息,得到所述目标信道信息测量结果,并根据所述目标信道信息测量结果进行链路自适应调整。a sending unit, configured to send a second PPDU to the target network device, where the second PPDU is used by the target network device to measure channel information using the second PPDU to obtain the target channel information measurement result, and Link adaptive adjustment is performed according to the target channel information measurement result.

结合本发明实施例的第五方面,在本发明实施例的第五方面的第一种实现方式中,探测PPDU的模式包括探测PPDU的带宽信息、探测PPDU采用室内模式还是室外模式、探测PPDU的长训练字段的傅里叶变化阶数信息以及探测PPDU的保护间隔信息中的至少一个。With reference to the fifth aspect of the embodiments of the present invention, in the first implementation manner of the fifth aspect of the embodiments of the present invention, the mode of detecting the PPDU includes detecting the bandwidth information of the PPDU, detecting whether the PPDU adopts the indoor mode or the outdoor mode, and detecting the mode of the PPDU. At least one of Fourier transform order information of the long training field and guard interval information of the probe PPDU.

结合本发明实施例的第五方面,在本发明实施例的第五方面的第二种实现方式中,所述探测PPDU的模式包括探测PPDU采用室内模式还是室外模式;With reference to the fifth aspect of the embodiments of the present invention, in a second implementation manner of the fifth aspect of the embodiments of the present invention, the mode of detecting the PPDU includes detecting whether the PPDU adopts an indoor mode or an outdoor mode;

当所述模式指示字段指示所述网络设备生成室外模式的探测PPDU时,所述生成单元,具体用于根据所述模式指示字段生成增强性的探测PPDU;When the mode indication field instructs the network device to generate an outdoor mode probe PPDU, the generating unit is specifically configured to generate an enhanced probe PPDU according to the mode indication field;

其中,所述增强性的探测PPDU是指具有以下格式中的至少一种的探测PPDU:Wherein, the enhanced sounding PPDU refers to a sounding PPDU having at least one of the following formats:

所述探测PPDU的前导码的至少一个符号在时域或频域上进行部分或者全部的复制,所述探测PPDU的部分或全部符号间的保护间隔大于第一预设值,所述探测PPDU的至少一个符号的调制编码方式MCS满足某一预设条件,以及所述探测PPDU的至少一个符号的傅里叶变化阶数高于第二预设值。At least one symbol of the preamble of the sounding PPDU is partially or completely copied in the time domain or frequency domain, the guard interval between some or all symbols of the sounding PPDU is greater than the first preset value, and the The modulation and coding mode MCS of at least one symbol satisfies a certain preset condition, and the Fourier transform order of at least one symbol of the probe PPDU is higher than a second preset value.

结合本发明实施例的第五方面、第五方面的第一至第二种实现方式中的任意一种,在本发明实施例的第五方面的第三种实现方式中,所述信道信息包括信道的扩展延迟和/或多用户间的延迟;With reference to the fifth aspect of the embodiments of the present invention and any one of the first to second implementation manners of the fifth aspect, in a third implementation manner of the fifth aspect of the embodiments of the present invention, the channel information includes Spread delay of the channel and/or delay between multiple users;

所述第二PPDU用于所述目标网络设备使用所述第二PPDU测量信道的扩展延迟和/或多用户间的延迟,并根据测量得到的信道的扩展延迟和/或多用户间的延迟进行保护间隔的自适应调整。The second PPDU is used by the target network device to use the second PPDU to measure the spread delay of the channel and/or the delay between multiple users, and perform the measurement according to the measured spread delay of the channel and/or the delay between multiple users. Adaptive adjustment of guard interval.

结合本发明实施例的第五方面、第五方面的第一至第二种实现方式中的任意一种,在本发明实施例的第五方面的第四种实现方式中,所述信道信息包括信道的SNR;With reference to the fifth aspect of the embodiments of the present invention and any one of the first to second implementation manners of the fifth aspect, in a fourth implementation manner of the fifth aspect of the embodiments of the present invention, the channel information includes: SNR of the channel;

所述第二PPDU用于所述目标网络设备使用所述第二PPDU测量信道的SNR,并根据测量得到的信道的SNR进行MCS的自适应调整。The second PPDU is used by the target network device to measure the SNR of the channel by using the second PPDU, and perform adaptive adjustment of the MCS according to the measured SNR of the channel.

本发明实施例的第六方面提供一种网络设备,包括:A sixth aspect of the embodiments of the present invention provides a network device, including:

生成单元,用于生成PPDU;其中,所述PPDU指示所述网络设备主动发送信道信息测量结果,所述PPDU还包括模式指示字段,所述模式指示字段用于指示所述网络设备测量信道信息所使用的探测PPDU的模式;A generating unit, configured to generate a PPDU; wherein the PPDU instructs the network device to actively send a channel information measurement result, and the PPDU further includes a mode indication field, where the mode indication field is used to indicate the network device to measure the channel information. The mode used to probe the PPDU;

发送单元,用于向目标网络设备发送所述PPDU,其中,所述PPDU用于所述目标网络设备根据所述模式指示字段确定目标信道信息测量结果,并根据所述目标信道信息测量结果进行链路自适应调整。A sending unit, configured to send the PPDU to a target network device, wherein the PPDU is used by the target network device to determine a target channel information measurement result according to the mode indication field, and perform chaining according to the target channel information measurement result Road adaptive adjustment.

结合本发明实施例的第六方面,在本发明实施例的第六方面的第一种实现方式中,探测PPDU的模式包括探测PPDU的带宽信息、探测PPDU采用室内模式还是室外模式、探测PPDU的长训练字段的傅里叶变化阶数信息以及探测PPDU的保护间隔信息中的至少一个。With reference to the sixth aspect of the embodiments of the present invention, in the first implementation manner of the sixth aspect of the embodiments of the present invention, the mode of detecting the PPDU includes detecting the bandwidth information of the PPDU, detecting whether the PPDU adopts the indoor mode or the outdoor mode, and detecting the PPDU mode. At least one of Fourier transform order information of the long training field and guard interval information of the probe PPDU.

结合本发明实施例的第六方面或第六方面的第一种实现方式,在本发明实施例的第六方面的第二种实现方式中,所述信道信息包括信道的扩展延迟和/或多用户间的延迟;With reference to the sixth aspect of the embodiments of the present invention or the first implementation manner of the sixth aspect, in the second implementation manner of the sixth aspect of the embodiments of the present invention, the channel information includes the spreading delay and/or the channel information. delay between users;

所述PPDU用于所述目标网络设备根据所述模式指示字段确定目标信道信息测量结果,并根据所述目标信道信息测量结果进行保护间隔的自适应调整。The PPDU is used by the target network device to determine the target channel information measurement result according to the mode indication field, and to perform adaptive adjustment of the guard interval according to the target channel information measurement result.

结合本发明实施例的第六方面或第六方面的第一种实现方式,在本发明实施例的第六方面的第三种实现方式中,所述信道信息包括信道的信噪比SNR;With reference to the sixth aspect of the embodiments of the present invention or the first implementation manner of the sixth aspect, in a third implementation manner of the sixth aspect of the embodiments of the present invention, the channel information includes a signal-to-noise ratio SNR of the channel;

所述PPDU用于所述目标网络设备根据所述模式指示字段确定目标信道信息测量结果,并根据所述目标信道信息测量结果进行MCS的自适应调整。The PPDU is used by the target network device to determine the target channel information measurement result according to the mode indication field, and to perform adaptive adjustment of the MCS according to the target channel information measurement result.

本发明实施例提供的技术方案中,第一网络设备获取目标信道信息测量结果,该目标信道信息测量结果为根据目标模式的探测物理层协议数据单元PPDU测量信道信息得到的测量结果;并根据该目标信道信息测量结果进行链路自适应调整,因此相对于现有技术,本发明实施例可灵活获取使用某一特定模式的探测PPDU测量信道信息得到的测量结果,以适配不同应用场景下的不同需求,提高信道信息测量的灵活度,从而为用户提供准确的链路自适应。In the technical solution provided by the embodiment of the present invention, the first network device obtains the target channel information measurement result, and the target channel information measurement result is the measurement result obtained by measuring the channel information according to the probing physical layer protocol data unit PPDU of the target mode; The link adaptive adjustment is performed on the target channel information measurement result. Therefore, compared with the prior art, the embodiment of the present invention can flexibly obtain the measurement result obtained by measuring the channel information using a probe PPDU in a specific mode, so as to adapt to different application scenarios. Different requirements, improve the flexibility of channel information measurement, so as to provide users with accurate link adaptation.

附图说明Description of drawings

图1为IEEE 802.11n标准中MAC帧的格式示意图;Figure 1 is a schematic diagram of the format of a MAC frame in the IEEE 802.11n standard;

图2为IEEE 802.11n标准中HT控制字段的格式示意图;FIG. 2 is a schematic diagram of the format of the HT control field in the IEEE 802.11n standard;

图3为图2中链路适应控制字段的格式示意图;3 is a schematic diagram of the format of the link adaptation control field in FIG. 2;

图4为IEEE 802.11ac标准中HT控制字段的格式示意图;FIG. 4 is a schematic diagram of the format of the HT control field in the IEEE 802.11ac standard;

图5为本发明实施例中WLAN的链路自适应方法一个实施例示意图;FIG. 5 is a schematic diagram of an embodiment of a link adaptation method for WLAN in an embodiment of the present invention;

图6为本发明实施例中WLAN的链路自适应方法另一实施例示意图;FIG. 6 is a schematic diagram of another embodiment of a link adaptation method for WLAN in an embodiment of the present invention;

图7为本发明实施例中探测PPDU一种格式示意图;7 is a schematic diagram of a format of a detection PPDU in an embodiment of the present invention;

图8为本发明实施例中WLAN的链路自适应方法另一实施例示意图;FIG. 8 is a schematic diagram of another embodiment of a link adaptation method for WLAN in an embodiment of the present invention;

图9为本发明实施例中WLAN的链路自适应方法另一实施例示意图;FIG. 9 is a schematic diagram of another embodiment of a link adaptation method for WLAN in an embodiment of the present invention;

图10为本发明实施例中HT控制字段一种格式示意图;10 is a schematic diagram of a format of an HT control field in an embodiment of the present invention;

图11为本发明实施例中WLAN的链路自适应方法另一实施例示意图;11 is a schematic diagram of another embodiment of a link adaptation method for a WLAN in an embodiment of the present invention;

图12为本发明实施例中WLAN的链路自适应方法另一实施例示意图;FIG. 12 is a schematic diagram of another embodiment of a link adaptation method for WLAN in an embodiment of the present invention;

图13为本发明实施例中WLAN的链路自适应方法另一实施例示意图;13 is a schematic diagram of another embodiment of a link adaptation method for WLAN in an embodiment of the present invention;

图14为本发明实施例中WLAN的链路自适应方法另一实施例示意图;14 is a schematic diagram of another embodiment of a link adaptation method for WLAN in an embodiment of the present invention;

图14a为本发明实施例中HT控制字段另一格式示意图;14a is a schematic diagram of another format of the HT control field in an embodiment of the present invention;

图15为本发明实施例中网络设备一个实施例示意图;FIG. 15 is a schematic diagram of an embodiment of a network device in an embodiment of the present invention;

图16为本发明实施例中网络设备另一实施例示意图;16 is a schematic diagram of another embodiment of a network device in an embodiment of the present invention;

图17为本发明实施例中网络设备另一实施例示意图;17 is a schematic diagram of another embodiment of a network device in an embodiment of the present invention;

图18为本发明实施例中网络设备另一实施例示意图;18 is a schematic diagram of another embodiment of a network device in an embodiment of the present invention;

图19为本发明实施例中网络设备另一实施例示意图。FIG. 19 is a schematic diagram of another embodiment of a network device in an embodiment of the present invention.

具体实施方式Detailed ways

本发明实施例提供了一种WLAN的链路自适应方法及网络设备,可提高信道信息测量的灵活度,为用户提供准确的链路自适应,以下分别进行详细说明。Embodiments of the present invention provide a WLAN link adaptation method and network device, which can improve the flexibility of channel information measurement and provide users with accurate link adaptation, which will be described in detail below.

下面将结合本发明实施例中的附图,对本发明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发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域技术人员在没有作出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

需要说明的是,本发明实施例应用于无线局域网中的OFDMA通信系统,该OFDMA通信系统包括第一网络设备以及至少一个第二网络设备,其中,上述至少一个第二网络设备通过无线方式与该第一网络设备通信连接。It should be noted that the embodiments of the present invention are applied to an OFDMA communication system in a wireless local area network, where the OFDMA communication system includes a first network device and at least one second network device, wherein the at least one second network device wirelessly communicates with the The first network device is communicatively connected.

例如,第一网络设备可以为AP(Access Point,接入点),则第二网络设备为STA(Station,站点),或者,在第一网络设备也可以为STA,则第二网络设备为AP。For example, the first network device may be an AP (Access Point, access point), then the second network device is a STA (Station, station), or, the first network device may also be a STA, then the second network device is an AP .

需要说明的是,在下面的各实施例中,仅以AP和STA之间链路自适应作为具体应用场景,对本发明的原理及实施方式进行示例性的阐述。It should be noted that, in the following embodiments, only the link adaptation between the AP and the STA is used as a specific application scenario to exemplarily illustrate the principles and implementations of the present invention.

为了方便理解本发明实施例,下面介绍本发明实施例描述中会引入的相关技术或者术语:To facilitate understanding of the embodiments of the present invention, related technologies or terms that will be introduced in the description of the embodiments of the present invention are introduced below:

一、高吞吐率控制字段1. High throughput control field

AP或STA通过MPDU(Medium Access Control Protocol Data Unit,媒体接入控制协议数据单元,简称MAC帧)中的HT(High Throughput,高吞吐率)控制字段进行链路自适应。The AP or the STA performs link adaptation through the HT (High Throughput, high throughput rate) control field in the MPDU (Medium Access Control Protocol Data Unit, medium access control protocol data unit, MAC frame for short).

如图1所示,为IEEE 802.11n标准中MAC帧的格式示意图。其中,HT控制字段包括在MAC帧的帧头中,用于对链路自适应以及校准位置等信息进行指示,该HT控制字段一般存在于控制包裹(Control Wrapper)帧,或者当帧控制字段的顺序比特被设置为1时的QoS数据帧中。As shown in FIG. 1 , it is a schematic diagram of the format of the MAC frame in the IEEE 802.11n standard. Among them, the HT control field is included in the frame header of the MAC frame and is used to indicate information such as link adaptation and calibration position. The HT control field generally exists in the Control Wrapper frame, or when the frame control field The sequence bit is set to 1 in the QoS data frame.

下面对一些现有标准中HT控制字段的格式进行简单介绍,例如:IEEE 802.11n标准中HT变种的HT控制字段以及IEEE 802.11ac标准中VHT(Very High Throughput,非常高吞吐率)变种的HT控制字段。The format of the HT control field in some existing standards is briefly introduced below, for example: the HT control field of the HT variant in the IEEE 802.11n standard and the HT variant of the VHT (Very High Throughput) variant in the IEEE 802.11ac standard Control field.

如图2所示,为IEEE 802.11n标准中HT控制字段(即HT变种的HT控制字段)的格式示意图,其中,图2中HT控制字段中的链路适应控制字段用于对与链路自适应相关的信息进行指示,具体可参见图3,为链路适应控制字段的格式示意图。As shown in FIG. 2, it is a schematic diagram of the format of the HT control field in the IEEE 802.11n standard (ie, the HT control field of the HT variant), wherein the link adaptation control field in the HT control field in FIG. The adaptation-related information is indicated, and FIG. 3 is a schematic diagram of the format of the link adaptation control field.

下面对IEEE 802.11n标准中的其中一种MCS(Modulation and Coding Scheme,调制与编码策略)的链路自适应流程中进行简单介绍,以下简称为TRQ(Training Request,探测请求)模式:链路适应请求端向响应端发送包括HT变种的HT控制字段的PPDU(PhysicalLayer Protocol Data Unit,物理层协议数据单元),其中,TRQ置为1,以指示需要响应端发送一个探测PPDU;响应者根据上述HT变种的HT控制字段生成探测PPDU并向链路适应请求端发送该探测PPDU;链路适应请求端则根据该探测PPDU测量信道信息并根据信道信息进行链路自适应调整。The following is a brief introduction to the link adaptation process of one of the MCS (Modulation and Coding Scheme, modulation and coding strategies) in the IEEE 802.11n standard, hereinafter referred to as TRQ (Training Request, probe request) mode: link The adaptation requester sends a PPDU (PhysicalLayer Protocol Data Unit, physical layer protocol data unit) including the HT control field of the HT variant to the responder, wherein TRQ is set to 1 to indicate that the responder needs to send a probe PPDU; the responder according to the above The HT control field of the HT variant generates a probe PPDU and sends the probe PPDU to the link adaptation requester; the link adaptation requester measures channel information according to the probe PPDU and performs link adaptation adjustment according to the channel information.

在IEEE 802.11n标准的基础上,人们对IEEE 802.11ac标准中的VHT变种的HT控制字段进行了更全面的设计,如图4所示,为IEEE 802.11ac标准中HT控制字段(即VHT变种的HT控制字段)的格式示意图。VHT变种的HT控制字段复用HT变种的HT控制字段,其中,使用HT变种的HT控制字段中原先是保留比特的第一个比特作为VHT比特,并以VHT比特来区分两种版本,当VHT比特置为0时,表示当前HT控制字段为HT变种的HT控制字段,当VHT比特置为1时,表示当前HT控制字段为VHT变种的HT控制字段。On the basis of the IEEE 802.11n standard, people have carried out a more comprehensive design of the HT control field of the VHT variant in the IEEE 802.11ac standard, as shown in Figure 4, which is the HT control field in the IEEE 802.11ac standard (that is, the Schematic diagram of the format of the HT control field). The HT control field of the VHT variant reuses the HT control field of the HT variant, wherein the first bit of the original reserved bit in the HT control field of the HT variant is used as the VHT bit, and the VHT bits are used to distinguish the two versions. When the bit is set to 0, it indicates that the current HT control field is the HT control field of the HT variant. When the VHT bit is set to 1, it indicates that the current HT control field is the HT control field of the VHT variant.

下面对IEEE 802.11ac标准中的其中两种MCS的链路自适应流程中进行简单介绍,包括请求-反馈机制和非请求方式-反馈机制:The following briefly introduces the link adaptation process of two MCSs in the IEEE 802.11ac standard, including the request-feedback mechanism and the unsolicited mode-feedback mechanism:

在请求-反馈机制的一种链路自适应流程中,链路适应请求端向响应端发送探测PPDU,其中,VHT置为1,以指示当前HT控制字段为VHT变种的HT控制字段,VHT置为1,MRQ(MCS请求)置为1,以指示需要响应端进行MCS反馈;则响应端使用上述探测PPDU测量信道信息并向链路适应请求端反馈信道信息测量结果,以便链路适应请求端根据信道信息测量结果进行链路自适应调整。In a link adaptation process of the request-feedback mechanism, the link adaptation requester sends a probe PPDU to the responder, where VHT is set to 1 to indicate that the current HT control field is the HT control field of the VHT variant, and VHT is set to is 1, MRQ (MCS request) is set to 1 to indicate that the responder needs to perform MCS feedback; then the responder uses the above-mentioned probe PPDU to measure the channel information and feeds back the channel information measurement result to the link adaptation requesting end, so that the link adaptation requesting end Link adaptive adjustment is performed according to the channel information measurement result.

非请求-反馈机制是指主动反馈端在通信对端没有发送反馈请求的情况下,针对通信对端之前发送的任何一帧或者多帧数据主动反馈信道信息测量结果。在非请求-反馈机制的一种链路自适应流程中,主动反馈端主动向其通信对端发送包括VHT变种的HT控制字段的PPDU,其中,VHT置为1,以指示当前HT控制字段为VHT变种的HT控制字段,Unsolicited MFB(Unsolicited MCS feedback indicator,非请求的MCS反馈指引)置为1,以指示MCS反馈为非请求方式的主动反馈,并在MFB(MCS feedback,MCS反馈)字段携带相应的信道信息测量结果,以便通信对端根据信道信息测量结果进行链路自适应调整。The non-request-feedback mechanism means that the active feedback end actively feeds back channel information measurement results for any frame or multiple frames of data previously sent by the communication opposite end when the communication opposite end does not send a feedback request. In a link adaptation process of the unsolicited-feedback mechanism, the active feedback end actively sends a PPDU including the HT control field of the VHT variant to its communication peer, where the VHT is set to 1 to indicate that the current HT control field is In the HT control field of the VHT variant, the Unsolicited MFB (Unsolicited MCS feedback indicator, unsolicited MCS feedback indicator) is set to 1 to indicate that the MCS feedback is unsolicited active feedback, and is carried in the MFB (MCS feedback, MCS feedback) field. Corresponding channel information measurement results, so that the communication peer can perform link adaptive adjustment according to the channel information measurement results.

需要说明的是,此处对HT控制字段中的一些公共信息,如MSI/STBC(MCS请求序列指引/时空分组编码)等字段不做介绍,本领域技术人员可参考现有相关标准以及后续相关标准中的规定。It should be noted that some public information in the HT control field, such as MSI/STBC (MCS request sequence guide/space-time block coding) and other fields, are not introduced here. Those skilled in the art can refer to existing relevant standards and subsequent related stipulated in the standard.

二、链路自适应2. Link adaptation

在本实施例中,链路自适应所调整的参数可以包括MCS、GI(Guard Interval,保护间隔)、冗余信息、发射功率以及时频资源等参数中的至少一个。在本实施例中,测量信道信息所采用信道参数可根据链路自适应所调整的参数确定,如信道的SNR(Signal to NoiseRatio,信噪比)、信道的扩展延迟或多用户间的延迟等,对应地,在请求-反馈机制和非请求-反馈机制的链路自适应过程中,测量信道信息得到的信道信息测量结果也对应包括多种内容,例如,MCS、GI或者天线选择等。In this embodiment, the parameters adjusted by the link adaptation may include at least one of parameters such as MCS, GI (Guard Interval, guard interval), redundancy information, transmit power, and time-frequency resources. In this embodiment, the channel parameters used to measure the channel information may be determined according to the parameters adjusted by link adaptation, such as the SNR (Signal to Noise Ratio, signal-to-noise ratio) of the channel, the spreading delay of the channel, or the delay between multiple users, etc. Correspondingly, in the link adaptation process of the request-feedback mechanism and the non-request-feedback mechanism, the channel information measurement result obtained by measuring the channel information also includes various contents, such as MCS, GI, or antenna selection.

如MCS的链路自适应,即链路自适应所调整的参数为MCS时,信道信息可以包括信道的SNR(Signal to Noise Ratio,信噪比),对应的信道信息测量结果可以包括:建议的时空流数目、建议的MCS、建议的MCS所采用的带宽,平均高效SNR等。For example, the link adaptation of MCS, that is, when the parameter adjusted by the link adaptation is MCS, the channel information may include the SNR (Signal to Noise Ratio, signal-to-noise ratio) of the channel, and the corresponding channel information measurement results may include: The number of spatiotemporal streams, the proposed MCS, the bandwidth used by the proposed MCS, the average high-efficiency SNR, etc.

如GI的链路自适应,即链路自适应所调整的参数为MCS时,信道信息可以包括信道的扩展延迟和/或多用户间的延迟,对应的信道信息测量结果可以包括建议的GI。For example, link adaptation of GI, that is, when the parameter adjusted by link adaptation is MCS, the channel information may include channel spreading delay and/or multi-user delay, and the corresponding channel information measurement result may include suggested GI.

需要说明的是,在下面的一些实施例中,主要以GI的链路自适应作为具体应用场景,对本发明的原理及实施方式进行示例性的阐述。It should be noted that, in some of the following embodiments, the principle and implementation of the present invention are exemplified mainly by taking the link adaptation of the GI as a specific application scenario.

请参阅图5,本发明实施例中WLAN的链路自适应方法一个实施例包括:Referring to FIG. 5, an embodiment of a WLAN link adaptation method in the embodiment of the present invention includes:

501、第一网络设备获取目标信道信息测量结果;501. A first network device acquires a target channel information measurement result;

其中,目标信道信息测量结果为根据目标模式的探测PPDU测量信道信息得到的测量结果,由此,步骤501具体可以理解为:首先,第一网络设备确定目标模式的探测PPDU,然后获取使用该目标模式的探测PPDU测量信道信息得到的目标信道信息测量结果。The measurement result of the target channel information is a measurement result obtained by measuring the channel information according to the probe PPDU of the target mode. Therefore, step 501 can be specifically understood as: first, the first network device determines the probe PPDU of the target mode, and then obtains and uses the target mode. The target channel information measurement result obtained by measuring the channel information of the probing PPDU of the mode.

在本实施例中,第一网络设备可以根据应用场景来确定目标模式的探测PPDU,即在不同的应用场景下,选取对应适配的目标模式的探测PPDU,例如,第一网络设备可以根据室内场景还是室外场景,所要测量的信道信息,信道信息的准确性要求,反馈效率要求,小区内信道的繁忙状况等来确定目标模式的探测PPDU,此处对探测PPDU的模式的选取规律不做限定。In this embodiment, the first network device may determine the probe PPDU of the target mode according to the application scenario, that is, in different application scenarios, select the probe PPDU corresponding to the adapted target mode, for example, the first network device may The scene is still an outdoor scene, the channel information to be measured, the accuracy requirements of the channel information, the feedback efficiency requirements, the busy status of the channels in the cell, etc. to determine the detection PPDU of the target mode. The selection rule of the detection PPDU mode is not limited here. .

需要说明的是,在本实施例中,探测PPDU的模式可以包括探测PPDU的带宽信息、探测PPDU采用室内模式还是室外模式、探测PPDU的LTF(Long Training Field,长训练字段)的傅里叶变化阶数信息以及探测PPDU的保护间隔信息中的至少一个。其中,探测PPDU的带宽信息是指探测PPDU采用哪一带宽;探测PPDU的长训练字段的傅里叶变化阶数信息是指探测PPDU采用哪一阶数的FFT(Fast Fourier Transformation,快速傅氏变换),例如,64点的FFT,或者更大的FFT,如128点的FFT或256点的FFT等。It should be noted that, in this embodiment, the mode of detecting the PPDU may include detecting the bandwidth information of the PPDU, detecting whether the PPDU adopts the indoor mode or the outdoor mode, and detecting the Fourier change of the LTF (Long Training Field, long training field) of the PPDU. at least one of order information and guard interval information of the probe PPDU. Among them, the bandwidth information of the detection PPDU refers to which bandwidth is used for the detection PPDU; the Fourier transformation order information of the long training field of the detection PPDU refers to the FFT (Fast Fourier Transformation, Fast Fourier Transform) of which order is used to detect the PPDU. ), for example, a 64-point FFT, or a larger FFT such as a 128-point FFT or a 256-point FFT, etc.

可以理解的是,在本实施例中,在不同机制的链路链路自适应流程中,获取目标信道信息测量结果的方式也将不同,具体此处对于如何获取目标信道信息测量结果将再后续的实施例中继续详细介绍。It can be understood that, in this embodiment, in the link adaptation process of different mechanisms, the method of acquiring the measurement result of the target channel information will also be different. Specifically, how to acquire the measurement result of the target channel information will be followed later. Continue to describe in detail in the embodiment of .

502、第一网络设备根据目标信道信息测量结果进行链路自适应调整;502. The first network device performs link adaptive adjustment according to the target channel information measurement result;

本实施例中,进行链路自适应调整所参考的信道信息测量结果,是使用目标模式的探测PPDU进行信道信息测量而得到的,由此,该信道信息测量结果对于当前应用场景才说更具有针对性,由此,可为用户提供准确的链路自适应。In this embodiment, the channel information measurement result referenced for link adaptation adjustment is obtained by using the probe PPDU of the target mode to perform channel information measurement. Therefore, the channel information measurement result is more relevant to the current application scenario. Therefore, accurate link adaptation can be provided for users.

本发明实施例提供的技术方案中,第一网络设备获取目标信道信息测量结果,该目标信道信息测量结果为根据目标模式的探测物理层协议数据单元PPDU测量信道信息得到的测量结果;并根据该目标信道信息测量结果进行链路自适应调整,因此相对于现有技术,本发明实施例可灵活获取使用某一特定模式的探测PPDU测量信道信息得到的测量结果,以适配不同应用场景下的不同需求,提高信道信息测量的灵活度,从而为用户提供准确的链路自适应。In the technical solution provided by the embodiment of the present invention, the first network device obtains the target channel information measurement result, and the target channel information measurement result is the measurement result obtained by measuring the channel information according to the probing physical layer protocol data unit PPDU of the target mode; The link adaptive adjustment is performed on the target channel information measurement result. Therefore, compared with the prior art, the embodiment of the present invention can flexibly obtain the measurement result obtained by measuring the channel information using a probe PPDU in a specific mode, so as to adapt to different application scenarios. Different requirements, improve the flexibility of channel information measurement, so as to provide users with accurate link adaptation.

下面从第一网络设备的角度对TRQ模式的一种链路自适应流程进行介绍,请参阅图6,本发明实施例中WLAN的链路自适应方法另一实施例包括:A link adaptation process of the TRQ mode is introduced below from the perspective of the first network device. Referring to FIG. 6 , another embodiment of the link adaptation method of the WLAN in the embodiment of the present invention includes:

601、第一网络设备向第二网络设备发送第一PPDU;601. A first network device sends a first PPDU to a second network device;

在本实施例中,第一PPDU指示第二网络设备需要发送探测PPDU,可以理解的是,在实际应用过程中,第一PPDU可以通过其前导字段或者其承载的MPDU来指示第二网络设备需要发送探测PPDU,具体此处不做限定。In this embodiment, the first PPDU indicates that the second network device needs to send a probe PPDU. It can be understood that, in the actual application process, the first PPDU may indicate that the second network device needs to use its preamble field or the MPDU carried by it. Send the probe PPDU, which is not limited here.

在本实施例中,该第一PPDU还包括模式指示字段,例如,记为T-Mode(RequiredTraining PPDU mode,需要的探测PPDU的模式)字段,该T-Mode字段用于指示第二网络设备生成目标模式的探测PPDU,可以理解的是,在实际应用过程中,T-Mode字段可以包括在第一PPDU的前导字段(例如,SIG-B字段)中,也可以包括在第一PPDU的MPDU中,具体此处不做限定。In this embodiment, the first PPDU further includes a mode indication field, for example, denoted as a T-Mode (RequiredTraining PPDU mode, the mode of the required probing PPDU) field, and the T-Mode field is used to instruct the second network device to generate It can be understood that, in the actual application process, the T-Mode field may be included in the preamble field (for example, the SIG-B field) of the first PPDU, and may also be included in the MPDU of the first PPDU. , which is not specifically limited here.

下面详细说明T-Mode字段如何指示第二网络设备生成目标模式的探测PPDU,以下分别举例说明:The following describes in detail how the T-Mode field instructs the second network device to generate the probe PPDU of the target mode. The following examples illustrate:

(1)第一字段;(1) The first field;

例如,第一字段记为BW(Bandwidth,带宽)字段,该BW字段用于指示探测PPDU应采用的带宽,即在探测PPDU的模式包括探测PPDU的带宽信息时,可以通过BW字段指示探测PPDU采用哪一带宽。For example, the first field is denoted as a BW (Bandwidth, bandwidth) field, and the BW field is used to indicate the bandwidth that the probe PPDU should use. which bandwidth.

(2)第二字段;(2) the second field;

例如,第二字段记为Indoor/Outdoor(Indoor mode or Outdoor mode,室内/室外模式)字段,该Indoor/Outdoor字段用于指示探测PPDU应采用室内模式还是室外模式,即在探测PPDU的模式包括探测PPDU采用室内模式还是室外模式时,可以通过Indoor/Outdoor字段指示探测PPDU采用室内模式还是室外模式。For example, the second field is marked as the Indoor/Outdoor (Indoor mode or Outdoor mode, indoor/outdoor mode) field, and the Indoor/Outdoor field is used to indicate whether the detection PPDU should adopt the indoor mode or the outdoor mode, that is, the detection mode of the PPDU includes detection When the PPDU adopts the indoor mode or the outdoor mode, you can use the Indoor/Outdoor field to indicate whether the detection PPDU adopts the indoor mode or the outdoor mode.

(3)第三字段;(3) The third field;

例如,第三字段记为NX_HE-LTF(N*64FFT of HE-LTF,高效长训练字段的FFT阶数)字段,该NX_HE-LTF字段用于指示探测PPDU的长训练字段应采用的FFT的阶数,即在探测PPDU的模式包括探测PPDU的长训练字段的傅里叶变化阶数信息时,可以通过NX_HE-LTF字段指示探测PPDU采用哪一阶数的FFT,例如,在实际应用过程中,可以以64点为基准,将当前FFT的阶数表达为64的N倍,其中,N可以为1、2、4等。For example, the third field is denoted as the NX_HE-LTF (N*64FFT of HE-LTF, FFT order of the high-efficiency long training field) field, and the NX_HE-LTF field is used to indicate the order of the FFT that should be used in the long training field of the sounding PPDU That is, when the mode of detecting the PPDU includes the Fourier transform order information of the long training field of the detecting PPDU, the NX_HE-LTF field can be used to indicate which order of FFT to use for detecting the PPDU. For example, in the actual application process, The current FFT order may be expressed as N times 64 based on 64 points, where N may be 1, 2, 4, or the like.

(4)第四字段;(4) the fourth field;

例如,第四字段记为GI字段,该GI字段用于指示探测PPDU应采用的保护间隔长度,即在探测PPDU的模式包括探测PPDU的保护间隔信息时,可以通过GI字段指示探测PPDU采用哪一长度的GI,例如,0.4、0.8us,或者更长的GI,如1.6、2.4或3.2us等。For example, the fourth field is denoted as the GI field, and the GI field is used to indicate the length of the guard interval that should be used for the detection PPDU, that is, when the mode of the detection PPDU includes the guard interval information of the detection PPDU, the GI field can be used to indicate which one to use for the detection PPDU. GI of length, for example, 0.4, 0.8us, or longer GI, such as 1.6, 2.4, or 3.2us, etc.

可以理解的是,该探测PPDU的模式还可以包含更多用于对探测PPDU的参数进行描述的信息,具体此处不做限定,对应地,可以设置相应的字段对相关信息进行指示。It can be understood that the mode of the probe PPDU may also include more information for describing the parameters of the probe PPDU, which is not specifically limited here. Correspondingly, a corresponding field may be set to indicate the relevant information.

602、第一网络设备接收第二网络设备发送的第二PPDU;602. The first network device receives the second PPDU sent by the second network device;

在本实施例中,第二PPDU为第二网络设备根据T-Mode字段生成的目标模式的探测PPDU。In this embodiment, the second PPDU is a probe PPDU of the target mode generated by the second network device according to the T-Mode field.

例如,在Indoor/Outdoor字段指示探测PPDU应采用室外模式时,对应生成的目标模式的探测PPDU(即室外模式的探测PPDU)为增强性的探测PPDU,请参考图7,该增强性的探测PPDU是指具有以下格式中的至少一种的探测PPDU:For example, when the Indoor/Outdoor field indicates that the probe PPDU should adopt the outdoor mode, the probe PPDU corresponding to the generated target mode (that is, the probe PPDU of the outdoor mode) is an enhanced probe PPDU, please refer to FIG. 7, the enhanced probe PPDU Refers to a probe PPDU having at least one of the following formats:

(1)探测PPDU的前导码的至少一个符号在时域或频域上进行部分或者全部的复制;(1) Part or all of the at least one symbol of the preamble of the probe PPDU is copied in the time domain or the frequency domain;

即第二网络设备在生成探测PPDU的过程中,对前导码中的某一符号进行时域或者频域上的部分或者全部的复制,如图7中,对L-SIG符号进行完全复制。That is, in the process of generating the probe PPDU, the second network device performs partial or full replication of a certain symbol in the preamble in the time domain or frequency domain. As shown in FIG. 7 , the L-SIG symbol is completely replicated.

(2)探测PPDU的部分或全部符号间的GI大于第一预设值;(2) The GI between part or all of the detected PPDU symbols is greater than the first preset value;

即第二网络设备在生成探测PPDU的过程中,采用更长的GI,其中第一预设值可根据实际场景设定,例如可以为0.8us,则室外模式的探测PPDU可以采用比传统探测PPDU更长的GI,如1.6,2.4,3.2us等,此时,增长GI有助于抵抗室外场景中较大的扩展延迟。That is, in the process of generating the probe PPDU, the second network device adopts a longer GI, and the first preset value can be set according to the actual scene, for example, it can be 0.8us, then the probe PPDU in the outdoor mode can use a longer GI than the traditional probe PPDU. Longer GI, such as 1.6, 2.4, 3.2us, etc. At this time, increasing the GI helps to resist the larger expansion delay in outdoor scenes.

(3)探测PPDU的至少一个符号的MCS满足某一预设条件;(3) detecting that the MCS of at least one symbol of the PPDU satisfies a certain preset condition;

即第二网络设备在生成探测PPDU的过程中,探测PPDU的至少一个符号的MCS更具鲁棒性,例如,从MCS0至MCS9中最鲁棒的MCS0,或者IEEE 802.11ah标准中的MCS10,其鲁棒性比MCS0更佳,由此,在实际应用过程中,探测PPDU的信令字段或者数据字段都可以采用MCS10的调制编码方式。That is, when the second network device generates the probe PPDU, the MCS of at least one symbol of the probe PPDU is more robust, for example, the most robust MCS0 from MCS0 to MCS9, or the MCS10 in the IEEE 802.11ah standard, which The robustness is better than that of MCS0. Therefore, in the actual application process, the modulation and coding mode of MCS10 can be used for the signaling field or data field of the detection PPDU.

(4)探测PPDU的至少一个符号的FFT的阶数高于第二预设值。(4) The order of the FFT of at least one symbol of the probe PPDU is higher than the second preset value.

即第二网络设备在生成探测PPDU的过程中,探测PPDU可以采用更大阶数的FFT,如128点的FFT或者256点的FFT,此时,更大的FFT不仅可以提高效率,还可以减少扩展延迟带来的影响。That is, when the second network device generates the probe PPDU, the probe PPDU can use a larger order FFT, such as a 128-point FFT or a 256-point FFT. At this time, a larger FFT can not only improve efficiency, but also reduce The effect of spreading delays.

需要说明的是,上面仅以举例的方式对室外模式的探测PPDU的格式进行描述,在实际应用中,室外模式的探测PPDU的格式可以对上述格式进行结合使用,还可以采用根据需要设置更多其他的格式,例如,还可以再引入指示字段,用于对后续字段的可变模式进行指示,如,通过信令字段-A中的某一字段来指示信令字段-B的GI信息等,通过信令字段-B的某一字段来指示数据字段的GI信息等。It should be noted that the above only describes the format of the detection PPDU in the outdoor mode by way of example. In practical applications, the format of the detection PPDU in the outdoor mode can be used in combination with the above formats, and more For other formats, for example, an indication field can be introduced again to indicate the variable mode of the subsequent fields, for example, the GI information of the signaling field-B is indicated by a certain field in the signaling field-A, etc., The GI information of the data field and the like are indicated by a certain field of the signaling field-B.

603、第一网络设备使用第二PPDU测量信道信息,得到目标信道信息测量结果;603. The first network device uses the second PPDU to measure channel information to obtain a target channel information measurement result;

在本实施例中,第二PPDU为根据T-Mode字段生成的目标模式的探测PPDU,由此,使用该探测PPDU测量信道信息,便可得到目标信道信息测量结果。In this embodiment, the second PPDU is a probe PPDU of the target mode generated according to the T-Mode field. Therefore, by using the probe PPDU to measure channel information, a measurement result of the target channel information can be obtained.

604、第一网络设备根据目标信道信息测量结果进行链路自适应调整;604. The first network device performs link adaptive adjustment according to the target channel information measurement result;

可选地,在本实施例中,信道信息包括信道的扩展延迟和/或多用户间的延迟,对应的目标信道信息测量结果为目标GI,则步骤604具体为:第一网络设备根据目标GI进行GI的自适应调整。Optionally, in this embodiment, the channel information includes the channel spreading delay and/or the delay between multiple users, and the corresponding target channel information measurement result is the target GI, then step 604 is specifically: the first network device according to the target GI Perform adaptive adjustment of GI.

或者,在本实施例中,信道信息也可以包括信道的SNR,对应的目标信道信息测量结果为目标MCS,则步骤604具体为:第一网络设备根据目标MCS进行MCS的自适应调整。Alternatively, in this embodiment, the channel information may also include the SNR of the channel, and the corresponding target channel information measurement result is the target MCS. Step 604 specifically includes: the first network device performs adaptive adjustment of the MCS according to the target MCS.

可以理解的是,在本实施例中,测量信道信息所采用信道参数可根据链路自适应所调整的参数确定。It can be understood that, in this embodiment, the channel parameters used for measuring the channel information may be determined according to parameters adjusted by link adaptation.

本发明实施例提供的技术方案中,第一网络设备向第二网络设备发送第一PPDU,其中,该第一PPDU指示需要第二网络设备发送探测PPDU,且第一PPDU还包括模式指示字段,该模式指示字段用于指示第二网络设备生成目标模式的探测PPDU;并接收第二PPDU,其中,该第二PPDU为第二网络设备根据模式指示字段生成的目标模式的探测PPDU;然后使用第二PPDU测量信道信息,得到目标信道信息测量结果,并根据该目标信道信息测量结果进行链路自适应调整。因此相对于现有技术,本发明实施例在第一PPDU中还携带有模式指示字段,以对探测PPDU的模式进行指定,从而可以使用对应模式的探测PPDU测量信道信息,得到对应的信道信息测量结果,由此,本发明实施例可灵活获取使用某一特定模式的探测PPDU测量信道信息得到的测量结果,以适配不同应用场景下的不同需求,提高信道信息测量的灵活度,从而为用户提供准确的链路自适应。In the technical solution provided by the embodiment of the present invention, the first network device sends a first PPDU to the second network device, wherein the first PPDU indicates that the second network device needs to send a probe PPDU, and the first PPDU further includes a mode indication field, The mode indication field is used to instruct the second network device to generate a probe PPDU of the target mode; and receive a second PPDU, where the second PPDU is a probe PPDU of the target mode generated by the second network device according to the mode indicator field; and then use the first Two PPDUs measure channel information, obtain a target channel information measurement result, and perform link adaptive adjustment according to the target channel information measurement result. Therefore, compared with the prior art, the embodiment of the present invention also carries a mode indication field in the first PPDU to specify the mode of the probe PPDU, so that the probe PPDU of the corresponding mode can be used to measure the channel information, and the corresponding channel information measurement can be obtained. As a result, the embodiment of the present invention can flexibly acquire measurement results obtained by measuring channel information using a probe PPDU in a specific mode, so as to adapt to different requirements in different application scenarios, improve the flexibility of channel information measurement, and provide users Provides accurate link adaptation.

下面从第二网络设备的角度对TRQ模式的一种链路自适应流程进行介绍,请参阅图8,本发明实施例中WLAN的链路自适应方法另一实施例包括:A link adaptation process of the TRQ mode is described below from the perspective of the second network device. Referring to FIG. 8 , another embodiment of the link adaptation method of the WLAN in the embodiment of the present invention includes:

801、第二网络设备接收第一网络设备发送的第一PPDU;801. The second network device receives the first PPDU sent by the first network device;

在本实施例中,第一PPDU指示第二网络设备需要发送探测PPDU,可以理解的是,在实际应用过程中,第一PPDU可以通过其前导字段或者其承载的MPDU来指示第二网络设备需要发送探测PPDU,具体此处不做限定。In this embodiment, the first PPDU indicates that the second network device needs to send a probe PPDU. It can be understood that, in the actual application process, the first PPDU may indicate that the second network device needs to use its preamble field or the MPDU carried by it. Send the probe PPDU, which is not limited here.

在本实施例中,该第一PPDU还包括模式指示字段,该模式指示字段用于指示第二网络设备生成目标模式的探测PPDU,具体此处关于模式指示字段的说明可以参考图6所示实施例中步骤601的描述,此处不再赘述。In this embodiment, the first PPDU further includes a mode indication field, and the mode indication field is used to instruct the second network device to generate a probe PPDU of the target mode. Specifically, for the description of the mode indication field, please refer to the implementation shown in FIG. 6 . The description of step 601 in the example is not repeated here.

802、第二网络设备根据模式指示字段生成目标模式的第二PPDU;802. The second network device generates a second PPDU of the target mode according to the mode indication field;

在本实施例中,第二网络设备在接收到第一网络设备发送的第一PPDU后,读取其中的模式指示字段,并根据该模式指示字段生成相应目标模式的探测PPDU,即第二PPDU。In this embodiment, after receiving the first PPDU sent by the first network device, the second network device reads the mode indication field therein, and generates a probe PPDU of the corresponding target mode according to the mode indication field, that is, the second PPDU .

803、第二网络设备向第一网络设备发送第二PPDU;803. The second network device sends a second PPDU to the first network device;

其中,该第二PPDU用于第一网络设备使用该第二PPDU测量信道信息,得到目标信道信息测量结果,并根据该目标信道信息测量结果进行链路自适应调整。Wherein, the second PPDU is used by the first network device to use the second PPDU to measure channel information, obtain a target channel information measurement result, and perform link adaptive adjustment according to the target channel information measurement result.

下面在图6、8所示实施例的基础上,以模式指示字段包括在第一PPDU的HT控制字段中为例,对TRQ模式的一种WLAN的链路自适应方法进行详细描述,请参见图9,本发明实施例中WLAN的链路自适应方法另一实施例包括:Based on the embodiments shown in FIGS. 6 and 8 , taking the mode indication field included in the HT control field of the first PPDU as an example, a WLAN link adaptation method in the TRQ mode will be described in detail. Please refer to FIG. 9, another embodiment of the link adaptation method of the WLAN in the embodiment of the present invention includes:

901、第一网络设备向第二网络设备发送第一PPDU;901. A first network device sends a first PPDU to a second network device;

其中,第一PPDU承载有至少一个MPDU,且该MPDU指示需要第二网络设备发送探测PPDU,例如,在实际应用过程中,可以通过将TRQ比特置1来指示需要第二网络设备发送探测PPDU,具体请参考图10。The first PPDU carries at least one MPDU, and the MPDU indicates that the second network device needs to send the probe PPDU. For example, in the actual application process, the TRQ bit can be set to 1 to indicate that the second network device needs to send the probe PPDU. Please refer to Figure 10 for details.

在本实施例中,MPDU包括HT控制字段,且HT控制字段还包括T-Mode字段,该T-Mode字段用于指示第二网络设备生成目标模式的探测PPDU,如图10中:BW字段,用于指示探测PPDU应采用的带宽;Indoor/Outdoor字段,用于指示探测PPDU应采用室内模式还是室外模式,NX_HE-LTF字段,用于指示探测PPDU的长训练字段应采用的FFT的阶数;GI字段,用于指示探测PPDU应采用的保护间隔长度。In this embodiment, the MPDU includes an HT control field, and the HT control field further includes a T-Mode field, where the T-Mode field is used to instruct the second network device to generate a probe PPDU of the target mode, as shown in FIG. 10 : the BW field, It is used to indicate the bandwidth that the probe PPDU should adopt; the Indoor/Outdoor field is used to indicate whether the probe PPDU should adopt the indoor mode or the outdoor mode, and the NX_HE-LTF field is used to indicate the order of the FFT that should be adopted in the long training field of the probe PPDU; The GI field is used to indicate the length of the guard interval that the probe PPDU should use.

可以理解的是,该T-Mode字段还可以包含更多用于对探测PPDU的参数进行指示的字段,具体此处不做限定。It can be understood that the T-Mode field may further include more fields for indicating parameters of the probe PPDU, which is not specifically limited here.

在实际应用过程中,可以根据应用场景对T-Mode字段进行设置,以对探测PPDU的目标模式进行指示,其中,应用场景包括室内场景还是室外场景,所要测量的信道信息,信道信息的准确性要求,反馈效率要求,小区内信道的繁忙状况等,下面进行举例说明:In the actual application process, the T-Mode field can be set according to the application scenario to indicate the target mode for detecting the PPDU, wherein the application scenario includes an indoor scenario or an outdoor scenario, the channel information to be measured, and the accuracy of the channel information. requirements, feedback efficiency requirements, the busy status of channels in the cell, etc. The following examples illustrate:

若第一网络设备为室内场景,则可以将T-Mode字段的Indoor/Outdoor字段设置为室内模式,由此,生成室内模式的探测PPDU,该探测PPDU的GI较短,如0.8us,从而保证在第一网络设备获取到信道信息测量结果的前提下,尽量减小第二网络设备发送该探测PPDU造成的开销。If the first network device is an indoor scene, the Indoor/Outdoor field of the T-Mode field may be set to the indoor mode, thereby generating a probe PPDU in the indoor mode, and the GI of the probe PPDU is short, such as 0.8us, so as to ensure On the premise that the first network device obtains the channel information measurement result, the overhead caused by the second network device sending the probe PPDU is minimized.

若第一网络设备所要测量的信道信息为扩展延迟,则可以将T-Mode字段的GI字段设置为最长的GI,以保证探测PPDU的长训练字段的GI长度大于当前信道的扩展延迟,否则信道多个径上的信号会重叠在一起,即使接收到探测PPDU,也无法正确测量当前信道的扩展延迟。If the channel information to be measured by the first network device is the extension delay, the GI field of the T-Mode field may be set to the longest GI to ensure that the GI length of the long training field of the probe PPDU is greater than the extension delay of the current channel, otherwise Signals on multiple paths of the channel will overlap, and even if the sounding PPDU is received, the spreading delay of the current channel cannot be measured correctly.

若第一网络设备对信道信息的准确性要求较高,如希望测量出所有子载波的信道信息,则可以将T-Mode字段的NX_HE-LTF字段设置为4X HE-LTF;其中,若信道相邻子载波的信道相关特性较高,则可以将T-Mode字段的NX_HE-LTF字段设置为1X HE-LTF或者2X HE-LTF,此时,第一网络设备通过对1X HE-LTF或者2X HE-LTF测得的信道进行插值,在得到所有子载波上的信道信息的前提下,尽量减小第二网络设备发送该探测PPDU造成的开销。If the first network device has high requirements on the accuracy of the channel information, if you want to measure the channel information of all subcarriers, you can set the NX_HE-LTF field of the T-Mode field to 4X HE-LTF; If the channel correlation characteristics of the adjacent subcarriers are relatively high, the NX_HE-LTF field of the T-Mode field may be set to 1X HE-LTF or 2X HE-LTF. - Interpolate the channel measured by the LTF, and on the premise of obtaining channel information on all subcarriers, try to reduce the overhead caused by the second network device sending the probe PPDU.

还比如,当前根据小区内信道的繁忙状况,在某一信道(如20M)上具有更高的传输效率时,可以将T-Mode字段的BW字段设置为20M带宽,由此,第二网络设备可以更快地获取到传输探测PPDU的机会,以便第一网络设备尽快进行信道信息的测量。For another example, according to the busy state of the channel in the cell, when a certain channel (such as 20M) has higher transmission efficiency, the BW field of the T-Mode field can be set to 20M bandwidth, so that the second network device The opportunity to transmit the probe PPDU can be acquired faster, so that the first network device can measure the channel information as soon as possible.

需要说明的是,上面仅以几个例子说明了第一网络设备设置T-Mode字段的具体方式,在实际应用中,第一网络设备可以对上述设置方式进行结合使用,还可以采用其他的设置方式,具体的设置方式此处不做限定。It should be noted that the above only describes the specific ways of setting the T-Mode field by the first network device with a few examples. In practical applications, the first network device can use the above setting methods in combination, and other settings can also be used. The specific setting method is not limited here.

具体此处关于T-Mode字段的描述可以参考图6所示实施例中步骤601,下面在此基础上,对T-Mode字段的具体格式进行详细说明:Specifically, for the description of the T-Mode field here, reference may be made to step 601 in the embodiment shown in FIG. 6 . Based on this, the specific format of the T-Mode field is described in detail below:

首先,需要说明的是,在本实施例中,可以为本发明实施例中的MPDU添加新的版本标识字段,例如,记为HE比特,由此,本发明实施例中的HT控制字段可以理解为HE变种的HT控制字段。在实际应用过程中,为实现版本的向下兼容,在VHT变种的HT控制字段的基础上,将HE比特设定在VHT比特的后一个比特位置。可以理解的是,在某些特定的应用场景中,也可以不包括上述版本标识字段。First of all, it should be noted that in this embodiment, a new version identification field may be added to the MPDU in this embodiment of the present invention, for example, denoted as HE bit, and thus, the HT control field in this embodiment of the present invention can be understood HT control field for HE variants. In the actual application process, in order to realize the backward compatibility of the version, on the basis of the HT control field of the VHT variant, the HE bit is set at the bit position after the VHT bit. It can be understood that, in some specific application scenarios, the above-mentioned version identification field may not be included.

在本实施例中,对T-Mode字段的具体位置以及比特数目不做限定,例如,如图10所示,BW字段可以包括2个比特,Indoor/Outdoor字段可以包括一个比特,NX_HE-LTF字段可以包括2个比特,GI字段可以包括2个比特。In this embodiment, the specific position and number of bits of the T-Mode field are not limited. For example, as shown in FIG. 10, the BW field may include 2 bits, the Indoor/Outdoor field may include one bit, and the NX_HE-LTF field 2 bits may be included, and the GI field may include 2 bits.

可选地,在本实施例中,MPDU还可以包括第五字段,例如,记为Required(Numberof Training PPDU need to be transmitted,需要发送的探测PPDU的个数)字段,该Required字段用于指示第二网络设备需要发送探测PPDU的数量。当然,在其他一些实施例中,该Required字段也可以包括在第一PPDU的其他部分,如前导字段中。Optionally, in this embodiment, the MPDU may further include a fifth field, for example, denoted as a Required (Number of Training PPDU need to be transmitted, the number of probe PPDUs to be sent) field, the Required field is used to indicate the first Two network devices need to send the number of probe PPDUs. Of course, in some other embodiments, the Required field may also be included in other parts of the first PPDU, such as a preamble field.

可选地,在本实施例中,MPDU可以包括控制包裹(Control Wrapper)帧、当帧控制字段的顺序比特被设置为1时的QoS数据帧、信标帧、探测响应帧或者关联响应帧等。在实际应用过程中,还可以包括其他类型的一些帧,具体此处对MPDU的帧类型不做限定。Optionally, in this embodiment, the MPDU may include a Control Wrapper frame, a QoS data frame when the sequence bit of the frame control field is set to 1, a beacon frame, a probe response frame, or an association response frame, etc. . In the actual application process, some frames of other types may also be included, and the frame type of the MPDU is not limited here.

902、第二网络设备根据模式指示字段生成目标模式的第二PPDU;902. The second network device generates a second PPDU of the target mode according to the mode indication field;

在本实施例中,第二网络设备在接收到第一网络设备发送的第一PPDU后,读取其中的T-Mode字段,并根据该T-Mode字段生成相应目标模式的探测PPDU,即第二PPDU。In this embodiment, after receiving the first PPDU sent by the first network device, the second network device reads the T-Mode field therein, and generates a probe PPDU of the corresponding target mode according to the T-Mode field, that is, the first PPDU. Two PPDUs.

在本实施例中,与Required字段对应,第二PPDU还可以包括第六字段,例如,记为Remaining(Number of Remaining Training PPDU need to be transmitted,剩余需要发送的探测PPDU的个数)字段,该Remaining字段用于指示第二网络设备后续还会发送探测PPDU的数量。In this embodiment, corresponding to the Required field, the second PPDU may further include a sixth field, for example, denoted as Remaining (Number of Remaining Training PPDU need to be transmitted, the number of remaining probe PPDUs to be transmitted) field, the The Remaining field is used to indicate the number of probe PPDUs that the second network device will send later.

具体此处关于探测PPDU的说明可以参考图6所示实施例中的步骤602,此处不再赘述。Specifically, for the description about the detection of the PPDU here, reference may be made to step 602 in the embodiment shown in FIG. 6 , and details are not repeated here.

903、第二网络设备向第一网络设备发送第二PPDU;903. The second network device sends a second PPDU to the first network device;

904、第一网络设备使用第二PPDU测量信道信息,得到目标信道信息测量结果;904. The first network device uses the second PPDU to measure channel information to obtain a target channel information measurement result;

905、第一网络设备根据目标信道信息测量结果进行链路自适应调整;905. The first network device performs link adaptive adjustment according to the target channel information measurement result;

本实施例中的步骤904至905与图6所示实施例中的步骤603至604过程相同,具体此处不再赘述。Steps 904 to 905 in this embodiment are the same as steps 603 to 604 in the embodiment shown in FIG. 6 , and details are not repeated here.

为了便于理解,下面结合图10所示的HT控制字段,以一具体应用场景对TRQ模式的一种GI链路自适应流程进行介绍,请参阅图11,本发明实施例中WLAN的链路自适应方法一个实施例包括:For ease of understanding, a GI link adaptation process in the TRQ mode will be introduced in a specific application scenario with reference to the HT control field shown in FIG. 10 . Please refer to FIG. 11 . One embodiment of the adaptation method includes:

1101、AP向STA发送携带有HE变种的HT控制字段的第一PPDU;1101. The AP sends a first PPDU carrying the HT control field of the HE variant to the STA;

在本实施例中,将HT控制字段的VHT比特和HE比特均置1,以指示当前HT控制字段为HE变种的HT控制字段;将TRQ置1,以表示将进行TRQ模式的GI链路自适应;然后设置T-Mode字段和Required字段。In this embodiment, both the VHT bit and the HE bit of the HT control field are set to 1 to indicate that the current HT control field is the HT control field of the HE variant; TRQ is set to 1 to indicate that the GI link in the TRQ mode will be automatically Adapt; then set the T-Mode field and the Required field.

1102、STA根据第一PPDU生成目标模式的第二PPDU;1102. The STA generates a second PPDU in the target mode according to the first PPDU;

在本实施例中,STA读取MPDU,其中,通过TRQ得知需要发送探测PPDU,并进一步读取T-Mode字段,得知需要发送的探测PPDU的模式,并读取Required字段,得到需要发送的探测PPDU的个数,并生成对应的探测PPDU,即第二PPDU。在本实施例中,第二PPDU携带有HT控制字段,且将HT控制字段的VHT比特和HE比特均置1,以指示当前HT控制字段为HE变种的HT控制字段,然后设置Remaining字段,以指示STA后续还会发送探测PPDU的数量。In this embodiment, the STA reads the MPDU, wherein, through TRQ, it learns that the probe PPDU needs to be sent, and further reads the T-Mode field to learn the mode of the probe PPDU to be sent, and reads the Required field to obtain the need to send. The number of probe PPDUs is determined, and a corresponding probe PPDU, that is, a second PPDU, is generated. In this embodiment, the second PPDU carries the HT control field, and both the VHT bit and the HE bit of the HT control field are set to 1 to indicate that the current HT control field is the HT control field of the HE variant, and then the Remaining field is set to Indicates the number of probe PPDUs that the STA will send later.

1103、STA向AP发送第二PPDU;1103. The STA sends a second PPDU to the AP;

1104、AP使用第二PPDU测量信道的扩展延迟和/或多用户间的延迟,得到目标GI;1104. The AP uses the second PPDU to measure the spread delay of the channel and/or the delay between multiple users to obtain the target GI;

其中,AP通过第二PPDU的长训练字段测量扩展延迟和/或多用户间的延迟。Wherein, the AP measures the spreading delay and/or the delay between multiple users through the long training field of the second PPDU.

1105、AP根据目标GI进行GI的自适应调整;1105. The AP performs adaptive adjustment of the GI according to the target GI;

在本实施例中,AP在得到目标GI后,便可以根据该目标GI进行GI的自适应调整。In this embodiment, after obtaining the target GI, the AP can perform adaptive adjustment of the GI according to the target GI.

下面从第一网络设备的角度对非请求-反馈机制的一种链路自适应流程进行介绍,请参阅图12,本发明实施例中WLAN的链路自适应方法另一实施例包括:A link adaptation process of the unsolicited-feedback mechanism is introduced below from the perspective of the first network device. Referring to FIG. 12 , another embodiment of the link adaptation method of the WLAN in the embodiment of the present invention includes:

1201、第一网络设备接收第二网络设备发送的PPDU;1201. The first network device receives the PPDU sent by the second network device;

在本实施例中,PPDU指示第二网络设备主动发送信道信息测量结果,以表示将进行非请求-反馈机制的链路自适应,可以理解的是,在实际应用过程中,PPDU可以通过其前导字段或者其承载的MPDU来指示第二网络设备主动发送信道信息测量结果,具体此处不做限定。In this embodiment, the PPDU instructs the second network device to actively send the channel information measurement result to indicate that the link adaptation of the unsolicited-feedback mechanism will be performed. It can be understood that in the actual application process, the PPDU can pass its preamble field or the MPDU carried by it to instruct the second network device to actively send the channel information measurement result, which is not specifically limited here.

在本实施例中,该第一PPDU还包括模式指示字段,例如,记为T-Mode(TrainingPPDU mode,探测PPDU模式)字段,该T-Mode字段用于指示第二网络设备测量信道信息所使用的探测PPDU的模式;可以理解的是,在实际应用过程中,T-Mode字段可以包括在第一PPDU的前导字段(例如,SIG-B字段)中,也可以包括在第一PPDU的MPDU中,具体此处不做限定。In this embodiment, the first PPDU further includes a mode indication field, for example, denoted as a T-Mode (Training PPDU mode, probing PPDU mode) field, where the T-Mode field is used to indicate the second network device to use for measuring the channel information It can be understood that in the actual application process, the T-Mode field may be included in the preamble field (for example, the SIG-B field) of the first PPDU, and may also be included in the MPDU of the first PPDU. , which is not specifically limited here.

下面详细说明T-Mode字段如何指示第二网络设备测量信道信息所使用的探测PPDU的模式,以下分别举例说明:The following describes in detail how the T-Mode field indicates the mode of the probe PPDU used by the second network device to measure the channel information. The following examples illustrate:

(1)第一字段;(1) The first field;

例如,第一字段记为BW(Bandwidth,带宽)字段,该BW字段用于指示探测PPDU采用的带宽,即在探测PPDU的模式包括探测PPDU的带宽信息时,可以通过BW字段指示探测PPDU是采用哪一带宽。For example, the first field is denoted as a BW (Bandwidth, bandwidth) field, and the BW field is used to indicate the bandwidth used by the probe PPDU, that is, when the mode of the probe PPDU includes the bandwidth information of the probe PPDU, the BW field can be used to indicate whether the probe PPDU adopts the probe PPDU. which bandwidth.

(2)第二字段;(2) the second field;

例如,第二字段记为Indoor/Outdoor(Indoor mode or Outdoor mode,室内/室外模式)字段,该Indoor/Outdoor字段用于指示探测PPDU采用室内模式还是室外模式,即在探测PPDU的模式包括探测PPDU采用室内模式还是室外模式时,可以通过Indoor/Outdoor字段指示探测PPDU是采用室内模式还是室外模式。For example, the second field is marked as an Indoor/Outdoor (Indoor mode or Outdoor mode, indoor/outdoor mode) field, and the Indoor/Outdoor field is used to indicate whether the detection PPDU adopts the indoor mode or the outdoor mode, that is, the detection PPDU mode includes the detection PPDU When the indoor mode or the outdoor mode is adopted, the Indoor/Outdoor field can be used to indicate whether the detection PPDU adopts the indoor mode or the outdoor mode.

(3)第三字段;(3) The third field;

例如,第三字段记为NX_HE-LTF(N*64FFT of HE-LTF,高效长训练字段的FFT阶数)字段,该NX_HE-LTF字段用于指示探测PPDU的长训练字段采用的FFT的阶数,即在探测PPDU的模式包括探测PPDU的长训练字段的傅里叶变化阶数信息时,可以通过NX_HE-LTF字段指示探测PPDU是采用哪一阶数的FFT,例如,在实际应用过程中,可以以64点为基准,将当前FFT的阶数表达为64的N倍,其中,N可以为1、2、4等。For example, the third field is denoted as the NX_HE-LTF (N*64FFT of HE-LTF, the FFT order of the high-efficiency long training field) field, and the NX_HE-LTF field is used to indicate the order of the FFT adopted by the long training field of the sounding PPDU , that is, when the mode of detecting the PPDU includes the Fourier transform order information of the long training field of the detecting PPDU, the NX_HE-LTF field can be used to indicate which order of FFT is used for detecting the PPDU. For example, in the actual application process, The current FFT order may be expressed as N times 64 based on 64 points, where N may be 1, 2, 4, or the like.

(4)第四字段;(4) the fourth field;

例如,第四字段记为GI字段,该GI字段用于指示探测PPDU采用的保护间隔长度,即在探测PPDU的模式包括探测PPDU的保护间隔信息时,可以通过GI字段指示探测PPDU是采用哪一长度的GI,例如,0.4、0.8us,或者更长的GI,如1.6、2.4或3.2us等。For example, the fourth field is denoted as the GI field, and the GI field is used to indicate the length of the guard interval used for the detection PPDU, that is, when the mode of the detection PPDU includes the guard interval information of the detection PPDU, the GI field can be used to indicate which one is used for the detection PPDU. GI of length, for example, 0.4, 0.8us, or longer GI, such as 1.6, 2.4, or 3.2us, etc.

可以理解的是,该探测PPDU的模式还可以包含更多用于对探测PPDU的参数进行描述的信息,具体此处不做限定,对应地,可以设置相应的字段对相关信息进行指示。It can be understood that the mode of the probe PPDU may also include more information for describing the parameters of the probe PPDU, which is not specifically limited here. Correspondingly, a corresponding field may be set to indicate the relevant information.

需要说明的是,在非请求-反馈机制的链路自适应流程中,第二网络设备可以主动向第一网络设备发送多个PPDU,以便不间断地向第一网络设备主动反馈多个信道信息测量结果。可以理解的是,在实际应用过程中,第二网络设备可以在任意模式的探测PPDU测量信道信息,例如,第二网络设备可以使用室外模式的探测PPDU测量信道信息,或者第二网络设备可以使用室内模式的探测PPDU(此处关于室外模式的探测PPDU可以参考图6所示实施例中的步骤602)测量信道信息,具体此处不做限定。It should be noted that, in the link adaptation process of the unsolicited-feedback mechanism, the second network device may actively send multiple PPDUs to the first network device, so as to actively feed back multiple channel information to the first network device without interruption. measurement results. It can be understood that, in an actual application process, the second network device may measure the channel information by probing PPDUs in any mode. For example, the second network device may measure the channel information by using the probing PPDUs in the outdoor mode, or the second network device may use The probe PPDU in the indoor mode (here, for the probe PPDU in the outdoor mode, refer to step 602 in the embodiment shown in FIG. 6 ) measures channel information, which is not specifically limited here.

1202、第一网络设备根据模式指示字段确定目标信道信息测量结果;1202. The first network device determines the target channel information measurement result according to the mode indication field;

在本实施例中,在接收到PPDU后,第一网络设备可以根据模式指示字段获知该PPDU所指示的信道信息测量结果是使用哪种模式的探测PPDU测量得到的,并确定是否选用使用该模式的探测PPDU测量信道信息得到的测量结果作为后续链路自适应调整所参考的信道信息测量结果,若是,则确定该信道信息测量结果为目标信道信息测量结果。In this embodiment, after receiving the PPDU, the first network device may learn, according to the mode indication field, which mode of the measurement result of the channel information indicated by the PPDU is obtained by using the probe PPDU measurement, and determine whether to select and use this mode The measurement result obtained by measuring the channel information of the probing PPDU is used as the channel information measurement result referenced by the subsequent link adaptive adjustment. If yes, the channel information measurement result is determined as the target channel information measurement result.

可以理解的是,在非请求-反馈机制的链路自适应流程中,第一网络设备可以接收第二网络设备发送的多个PPDU中,且根据模式指示字段的指示,获知各PPDU中的信道信息测量结果分别是使用哪种模式的探测PPDU测量得到的,由此,第一网络设备想获得使用某一特定模式的探测PPDU测量信道信息得到的测量结果,只需根据模式指示字段的指示进行选取,以适配不同应用场景下的不同需求。It can be understood that, in the link adaptation process of the unsolicited-feedback mechanism, the first network device can receive multiple PPDUs sent by the second network device, and learn the channel in each PPDU according to the indication of the mode indication field. The information measurement results are obtained by using which mode of probe PPDU measurement is used. Therefore, if the first network device wants to obtain the measurement result obtained by using a certain mode of probe PPDU measurement channel information, it only needs to perform the measurement according to the indication of the mode indication field. Select to suit different needs in different application scenarios.

1203、第一网络设备根据目标信道信息测量结果进行链路自适应调整;1203. The first network device performs link adaptive adjustment according to the target channel information measurement result;

在本实施例中,目标信道信息测量结果是由第一网络设备指定的使用某一特定模式的探测PPDU测量信道信息得到的测量结果,由此,第一网络设备可以灵活选择使用哪个模式的探测PPDU测量信道信息得到的测量结果进行链路自适应调整。In this embodiment, the target channel information measurement result is a measurement result obtained by measuring channel information using a probe PPDU of a certain mode specified by the first network device, so that the first network device can flexibly select which mode of probe to use The measurement result obtained by measuring the channel information of the PPDU is subjected to link adaptive adjustment.

本发明实施例提供的技术方案中,第一网络设备接收第二网络设备发送的PPDU,其中,该PPDU指示第二网络设备主动发送信道信息测量结果,且该PPDU还包括模式指示字段,该模式指示字段用于指示第二网络设备测量信道信息所使用的探测PPDU的模式;第一网络设备根据模式指示字段确定目标信道信息测量结果;并根据该目标信道信息测量结果进行链路自适应调整,由此,第一网络设备可以灵活选择使用哪个模式的探测PPDU测量信道信息得到的测量结果进行链路自适应调整。因此相对于现有技术,本发明实施例在PPDU中还携带有模式指示字段,以对测量信道信息所使用的探测PPDU的模式进行指定,以便第一网络设备获知信道信息测量结果是使用哪种模式的探测PPDU测量得到的,由此,本发明实施例可灵活获取使用某一特定模式的探测PPDU测量信道信息得到的测量结果,以适配不同应用场景下的不同需求,提高信道信息测量的灵活度,从而为用户提供准确的链路自适应。In the technical solution provided by the embodiment of the present invention, the first network device receives a PPDU sent by the second network device, wherein the PPDU instructs the second network device to actively send the channel information measurement result, and the PPDU further includes a mode indication field, the mode The indication field is used to indicate the mode of the probe PPDU used by the second network device to measure the channel information; the first network device determines the target channel information measurement result according to the mode indication field; and performs link adaptation adjustment according to the target channel information measurement result, In this way, the first network device can flexibly select which mode of the probing PPDU to use to measure the channel information for link adaptation adjustment. Therefore, compared with the prior art, the embodiment of the present invention also carries a mode indication field in the PPDU, so as to specify the mode of the probe PPDU used for measuring the channel information, so that the first network device can know which channel information measurement result is used. Therefore, the embodiment of the present invention can flexibly obtain measurement results obtained by measuring channel information using a probe PPDU of a certain mode, so as to adapt to different requirements in different application scenarios and improve the accuracy of channel information measurement. flexibility to provide users with accurate link adaptation.

下面从第二网络设备的角度对非请求-反馈机制的一种链路自适应流程进行介绍,请参阅图13,本发明实施例中WLAN的链路自适应方法另一实施例包括:A link adaptation process of the unsolicited-feedback mechanism is introduced below from the perspective of the second network device. Referring to FIG. 13 , another embodiment of the link adaptation method of the WLAN in the embodiment of the present invention includes:

1301、第二网络设备生成PPDU;1301. The second network device generates a PPDU;

在本实施例中,该PPDU指示第二网络设备主动发送信道信息测量结果,以表示将进行非请求-反馈机制的链路自适应,可以理解的是,在实际应用过程中,PPDU可以通过其前导字段或者其承载的MPDU来指示第二网络设备主动发送信道信息测量结果,具体此处不做限定。In this embodiment, the PPDU instructs the second network device to actively send the channel information measurement result to indicate that the link adaptation of the unsolicited-feedback mechanism will be performed. It can be understood that in the actual application process, the PPDU can pass the The preamble field or the MPDU carried by the preamble field is used to instruct the second network device to actively send the channel information measurement result, which is not specifically limited here.

在本实施例中,PPDU还包括模式指示字段,该模式指示字段用于指示第二网络设备测量信道信息所使用的探测PPDU的模式,具体此处关于模式指示字段的说明可以参考图12所示实施例中步骤1201的描述,此处不再赘述。In this embodiment, the PPDU further includes a mode indication field, and the mode indication field is used to indicate the mode of the sounding PPDU used by the second network device to measure the channel information. Specifically, for the description of the mode indication field, please refer to FIG. 12 . The description of step 1201 in the embodiment is not repeated here.

需要说明的是,在非请求-反馈机制的链路自适应流程中,第二网络设备可以主动向第一网络设备发送多个PPDU,以便不间断地向第一网络设备主动反馈多个信道信息测量结果。可以理解的是,在实际应用过程中,第二网络设备可以在任意模式的探测PPDU测量信道信息,例如,第二网络设备可以使用室外模式的探测PPDU测量信道信息,或者第二网络设备可以使用室内模式的探测PPDU(此处关于室外模式的探测PPDU可以参考图6所示实施例中的步骤602)测量信道信息,具体此处不做限定。It should be noted that, in the link adaptation process of the unsolicited-feedback mechanism, the second network device may actively send multiple PPDUs to the first network device, so as to actively feed back multiple channel information to the first network device without interruption. measurement results. It can be understood that, in an actual application process, the second network device may measure the channel information by probing PPDUs in any mode. For example, the second network device may measure the channel information using the probing PPDUs in the outdoor mode, or the second network device may use The probe PPDU in the indoor mode (here, for the probe PPDU in the outdoor mode, refer to step 602 in the embodiment shown in FIG. 6 ) measures channel information, which is not specifically limited here.

1302、第二网络设备向第一网络设备发送PPDU;1302. The second network device sends a PPDU to the first network device;

在本实施例中,PPDU用于第一网络设备根据模式指示字段确定目标信道信息测量结果,并根据该目标信道信息测量结果进行链路自适应调整。具体此处对于第一网络设备根据模式指示字段确定目标信道信息测量结果,并根据该目标信道信息测量结果进行链路自适应调整的过程可以参考图12所示实施例中的步骤1202和步骤1203。In this embodiment, the PPDU is used by the first network device to determine the target channel information measurement result according to the mode indication field, and to perform link adaptive adjustment according to the target channel information measurement result. Specifically, for the process of determining the target channel information measurement result according to the mode indication field by the first network device, and performing link adaptation adjustment according to the target channel information measurement result, reference may be made to steps 1202 and 1203 in the embodiment shown in FIG. 12 . .

下面在图12、13所示实施例的基础上,以模式指示字段包括在PPDU的HT控制字段中为例,对非请求-反馈机制的一种WLAN的链路自适应方法进行详细描述,请参见图14,本发明实施例中WLAN的链路自适应方法另一实施例包括:On the basis of the embodiments shown in FIGS. 12 and 13 , the mode indication field is included in the HT control field of the PPDU as an example to describe in detail a WLAN link adaptation method using an unsolicited-feedback mechanism. Referring to FIG. 14, another embodiment of the WLAN link adaptation method in the embodiment of the present invention includes:

1401、第二网络设备生成PPDU;1401. The second network device generates a PPDU;

在本实施例中,PPDU承载有至少一个MPDU,且该MPDU指示第二网络设备主动发送信道信息测量结果,以表示将进行非请求-反馈机制的链路自适应。可以理解的是,该MPDU还携带有信道信息测量结果。例如,在实际应用过程中,可以通过将Unsolicited MFB(Unsolicited GI Feedback,非请求式GI反馈)字段置1来指示第二网络设备主动发送信道信息测量结果,其中,信道信息测量结果携带在GFB(GI Feedback,GI反馈)字段中,以向第一网络设备指示适合的GI,具体请参考图14a。In this embodiment, the PPDU carries at least one MPDU, and the MPDU instructs the second network device to actively send the channel information measurement result to indicate that link adaptation of the unsolicited-feedback mechanism will be performed. It can be understood that the MPDU also carries the channel information measurement result. For example, in the actual application process, the Unsolicited MFB (Unsolicited GI Feedback, unsolicited GI Feedback) field may be set to 1 to instruct the second network device to actively send the channel information measurement result, where the channel information measurement result is carried in the GFB ( GI Feedback) field to indicate a suitable GI to the first network device, please refer to FIG. 14a for details.

在本实施例中,MPDU包括HT控制字段,且HT控制字段还包括T-Mode字段,该T-Mode字段用于指示第二网络设备测量信道信息所使用的探测PPDU的模式,如图14a中:BW字段,用于指示探测PPDU采用的带宽;Indoor/Outdoor字段,用于指示探测PPDU采用室内模式还是室外模式,NX_HE-LTF字段,用于指示探测PPDU的长训练字段采用的FFT的阶数;GI字段,用于指示探测PPDU采用的保护间隔长度。In this embodiment, the MPDU includes an HT control field, and the HT control field further includes a T-Mode field, where the T-Mode field is used to indicate the mode of the probe PPDU used by the second network device to measure the channel information, as shown in FIG. 14a : The BW field is used to indicate the bandwidth used by the probe PPDU; the Indoor/Outdoor field is used to indicate whether the probe PPDU adopts the indoor mode or the outdoor mode, and the NX_HE-LTF field is used to indicate the FFT order used in the long training field of the probe PPDU ; The GI field is used to indicate the length of the guard interval used by the probe PPDU.

可以理解的是,该T-Mode字段还可以包含更多用于对探测PPDU的参数进行指示的字段,具体此处不做限定。具体此处关于T-Mode字段的描述可以参考图12所示实施例中步骤1201。在本实施例中,对T-Mode字段的具体位置以及比特数目不做限定,具体此处可以参考图9所示实施例中的步骤901。It can be understood that the T-Mode field may further include more fields for indicating parameters of the probe PPDU, which is not specifically limited here. Specifically, for the description of the T-Mode field here, reference may be made to step 1201 in the embodiment shown in FIG. 12 . In this embodiment, the specific position and the number of bits of the T-Mode field are not limited. For details, reference may be made to step 901 in the embodiment shown in FIG. 9 here.

可选地,在本实施例中,MPDU可以包括控制包裹(Control Wrapper)帧、当帧控制字段的顺序比特被设置为1时的QoS数据帧、探测请求帧或者关联请求帧等。在实际应用过程中,还可以包括其他类型的一些帧,具体此处对MPDU的帧类型不做限定。Optionally, in this embodiment, the MPDU may include a control wrapper (Control Wrapper) frame, a QoS data frame when the sequence bit of the frame control field is set to 1, a probe request frame or an association request frame, and the like. In the actual application process, some frames of other types may also be included, and the frame type of the MPDU is not limited here.

1402、第二网络设备向第一网络设备发送PPDU;1402. The second network device sends a PPDU to the first network device;

1403、第一网络设备根据模式指示字段确定目标信道信息测量结果;1403. The first network device determines the target channel information measurement result according to the mode indication field;

1404、第一网络设备根据目标信道信息测量结果进行链路自适应调整;1404. The first network device performs link adaptive adjustment according to the target channel information measurement result;

本实施例中的步骤1403至1404与图12所示实施例中的步骤1202至1203过程相同,此处不再赘述。Steps 1403 to 1404 in this embodiment are the same as steps 1202 to 1203 in the embodiment shown in FIG. 12 , and are not repeated here.

上面对本发明实施例中的WLAN的链路自适应方法进行了描述,下面对本发明实施例中的网络设备进行描述,请参阅图15,本发明实施例中网络设备一个实施例包括:The link adaptation method of the WLAN in the embodiment of the present invention is described above, and the network device in the embodiment of the present invention is described below. Referring to FIG. 15, an embodiment of the network device in the embodiment of the present invention includes:

本发明实施例中的网络设备可以实现图5所示实施例的流程,所述网络设备包括:The network device in the embodiment of the present invention can implement the process of the embodiment shown in FIG. 5 , and the network device includes:

获取单元1510,用于获取目标信道信息测量结果,所述目标信道信息测量结果为根据目标模式的探测物理层协议数据单元PPDU测量信道信息得到的测量结果;an obtaining unit 1510, configured to obtain a target channel information measurement result, where the target channel information measurement result is a measurement result obtained by measuring the channel information according to the probing physical layer protocol data unit PPDU of the target mode;

调整单元1520,用于根据所述目标信道信息测量结果进行链路自适应调整。The adjustment unit 1520 is configured to perform link adaptation adjustment according to the target channel information measurement result.

为便于理解,下面以一具体应用场景为例,对本实施例中的网络设备的内部运作流程进行描述:For ease of understanding, the following takes a specific application scenario as an example to describe the internal operation process of the network device in this embodiment:

获取单元1510获取目标信道信息测量结果,所述目标信道信息测量结果为根据目标模式的探测物理层协议数据单元PPDU测量信道信息得到的测量结果;调整单元1520根据所述目标信道信息测量结果进行链路自适应调整。The acquiring unit 1510 acquires the measurement result of the target channel information, the measurement result of the target channel information is the measurement result obtained by measuring the channel information according to the probing physical layer protocol data unit PPDU of the target mode; the adjusting unit 1520 performs chaining according to the measurement result of the target channel information. Road adaptive adjustment.

本发明实施例提供的技术方案中,网络设备的获取单元1510获取目标信道信息测量结果,该目标信道信息测量结果为根据目标模式的探测物理层协议数据单元PPDU测量信道信息得到的测量结果;并由调整单元1520根据该目标信道信息测量结果进行链路自适应调整,因此相对于现有技术,本发明实施例可灵活获取使用某一特定模式的探测PPDU测量信道信息得到的测量结果,以适配不同应用场景下的不同需求,提高信道信息测量的灵活度,从而为用户提供准确的链路自适应。In the technical solution provided by the embodiment of the present invention, the obtaining unit 1510 of the network device obtains the target channel information measurement result, and the target channel information measurement result is the measurement result obtained by measuring the channel information according to the probing physical layer protocol data unit PPDU of the target mode; and The adjustment unit 1520 performs link adaptive adjustment according to the measurement result of the target channel information. Therefore, compared with the prior art, the embodiment of the present invention can flexibly obtain the measurement result obtained by measuring the channel information using the probe PPDU of a certain mode, so as to adapt to the target channel information. It can match different requirements in different application scenarios, improve the flexibility of channel information measurement, and provide users with accurate link adaptation.

下面对TRQ模式的一种网络设备进行描述,具体请参阅图16,本发明实施例中网络设备的方法另一实施例包括:A network device in the TRQ mode is described below. For details, please refer to FIG. 16. Another embodiment of the method for the network device in the embodiment of the present invention includes:

本发明实施例中的网络设备可以实现图6所示实施例的流程,所述网络设备包括:The network device in the embodiment of the present invention can implement the process of the embodiment shown in FIG. 6 , and the network device includes:

发送模块1611,用于向目标网络设备发送第一PPDU,其中,所述第一PPDU指示目标网络设备需要发送探测PPDU,且所述第一PPDU还包括模式指示字段,所述模式指示字段用于指示目标网络设备生成目标模式的探测PPDU;The sending module 1611 is configured to send a first PPDU to the target network device, wherein the first PPDU indicates that the target network device needs to send a probe PPDU, and the first PPDU further includes a mode indication field, where the mode indication field is used for Instruct the target network device to generate a probe PPDU of the target mode;

第一接收模块1612,用于接收所述目标网络设备发送的第二PPDU,其中,所述第二PPDU为所述目标网络设备根据所述模式指示字段生成的目标模式的探测PPDU;a first receiving module 1612, configured to receive a second PPDU sent by the target network device, where the second PPDU is a target mode probe PPDU generated by the target network device according to the mode indication field;

第一获取模块1613,用于使用所述第二PPDU测量信道信息,得到所述目标信道信息测量结果;a first obtaining module 1613, configured to use the second PPDU to measure channel information to obtain the target channel information measurement result;

调整单元1620,用于根据所述目标信道信息测量结果进行链路自适应调整。An adjustment unit 1620, configured to perform link adaptation adjustment according to the target channel information measurement result.

可选地,在本实施例中,探测PPDU的模式包括探测PPDU的带宽信息、探测PPDU采用室内模式还是室外模式、探测PPDU的长训练字段的傅里叶变化阶数信息以及探测PPDU的保护间隔信息中的至少一个。Optionally, in this embodiment, the mode of detecting the PPDU includes bandwidth information of the detecting PPDU, detecting whether the PPDU adopts the indoor mode or the outdoor mode, detecting the Fourier transform order information of the long training field of the detecting PPDU, and detecting the guard interval of the PPDU. at least one of the information.

可选地,在本实施例中,所述探测PPDU的模式包括探测PPDU采用室内模式还是室外模式;当所述模式指示字段指示目标网络设备生成室外模式的探测PPDU时,所述第二PPDU为所述目标网络设备根据所述模式指示字段生成的增强性的探测PPDU;Optionally, in this embodiment, the mode of detecting the PPDU includes detecting whether the PPDU adopts the indoor mode or the outdoor mode; when the mode indication field instructs the target network device to generate the detection PPDU in the outdoor mode, the second PPDU is the enhanced probe PPDU generated by the target network device according to the mode indication field;

其中,所述增强性的探测PPDU是指具有以下格式中的至少一种的探测PPDU:Wherein, the enhanced sounding PPDU refers to a sounding PPDU having at least one of the following formats:

所述探测PPDU的前导码的至少一个符号在时域或频域上进行部分或者全部的复制,所述探测PPDU的部分或全部符号间的保护间隔大于第一预设值,所述探测PPDU的至少一个符号的调制编码方式MCS满足某一预设条件,以及所述探测PPDU的至少一个符号的傅里叶变化阶数高于第二预设值。At least one symbol of the preamble of the sounding PPDU is partially or completely copied in the time domain or frequency domain, the guard interval between some or all symbols of the sounding PPDU is greater than the first preset value, and the The modulation and coding mode MCS of at least one symbol satisfies a certain preset condition, and the Fourier transform order of at least one symbol of the probe PPDU is higher than a second preset value.

可选地,在本实施例中,所述信道信息包括信道的扩展延迟和/或多用户间的延迟;Optionally, in this embodiment, the channel information includes channel spreading delay and/or multi-user delay;

所述调整单元1620,具体用于根据所述目标信道信息测量结果进行保护间隔的自适应调整。The adjusting unit 1620 is specifically configured to perform adaptive adjustment of the guard interval according to the target channel information measurement result.

可选地,在本实施例中,所述信道信息包括信道的SNR;Optionally, in this embodiment, the channel information includes the SNR of the channel;

所述调整单元1620,具体用于根据所述目标信道信息测量结果进行调制编码策略MCS的自适应调整。The adjusting unit 1620 is specifically configured to perform adaptive adjustment of the modulation and coding strategy MCS according to the target channel information measurement result.

本发明实施例提供的技术方案中,网络设备的发送模块1611向目标网络设备发送第一PPDU,其中,该第一PPDU指示需要目标网络设备发送探测PPDU,且第一PPDU还包括模式指示字段,该模式指示字段用于指示目标网络设备生成目标模式的探测PPDU;并由第一接收模块1612接收第二PPDU,其中,该第二PPDU为目标网络设备根据模式指示字段生成的目标模式的探测PPDU;然后由第一获取模块1613使用第二PPDU测量信道信息,得到目标信道信息测量结果,并通过调整单元1620根据该目标信道信息测量结果进行链路自适应调整。因此相对于现有技术,本发明实施例在第一PPDU中还携带有模式指示字段,以对探测PPDU的模式进行指定,从而可以使用对应模式的探测PPDU测量信道信息,得到对应的信道信息测量结果,由此,本发明实施例可灵活获取使用某一特定模式的探测PPDU测量信道信息得到的测量结果,以适配不同应用场景下的不同需求,提高信道信息测量的灵活度,从而为用户提供准确的链路自适应。In the technical solution provided by the embodiment of the present invention, the sending module 1611 of the network device sends a first PPDU to the target network device, where the first PPDU indicates that the target network device needs to send a probe PPDU, and the first PPDU further includes a mode indication field, The mode indication field is used to instruct the target network device to generate a probe PPDU of the target mode; and the first receiving module 1612 receives a second PPDU, where the second PPDU is a probe PPDU of the target mode generated by the target network device according to the mode indicator field ; Then the first acquisition module 1613 uses the second PPDU to measure the channel information to obtain the target channel information measurement result, and the adjustment unit 1620 performs link adaptive adjustment according to the target channel information measurement result. Therefore, compared with the prior art, the embodiment of the present invention also carries a mode indication field in the first PPDU to specify the mode of the probe PPDU, so that the probe PPDU of the corresponding mode can be used to measure the channel information, and the corresponding channel information measurement can be obtained. As a result, the embodiment of the present invention can flexibly acquire measurement results obtained by measuring channel information using a probe PPDU in a specific mode, so as to adapt to different requirements in different application scenarios, improve the flexibility of channel information measurement, and provide users Provides accurate link adaptation.

下面对TRQ模式的另一网络设备进行描述,具体请参阅图17,本发明实施例中网络设备的方法另一实施例包括:Another network device in the TRQ mode is described below, with reference to FIG. 17 for details. Another embodiment of the method for the network device in the embodiment of the present invention includes:

本发明实施例中的网络设备可以实现图8所示实施例的流程,所述网络设备包括:The network device in the embodiment of the present invention can implement the process of the embodiment shown in FIG. 8 , and the network device includes:

接收单元1710,用于接收目标网络设备发送的第一PPDU;其中,所述第一PPDU指示所述网络设备需要发送探测PPDU,且所述第一PPDU还包括模式指示字段,所述模式指示字段用于指示所述网络设备生成目标模式的探测PPDU;A receiving unit 1710, configured to receive a first PPDU sent by a target network device; wherein the first PPDU indicates that the network device needs to send a probe PPDU, and the first PPDU further includes a mode indication field, the mode indication field for instructing the network device to generate a probe PPDU of the target mode;

生成单元1720,用于根据所述模式指示字段生成目标模式的探测PPDU;a generating unit 1720, configured to generate a probe PPDU of the target mode according to the mode indication field;

发送单元1730,用于向所述目标网络设备发送第二PPDU,其中,所述第二PPDU用于所述目标网络设备使用所述第二PPDU测量信道信息,得到所述目标信道信息测量结果,并根据所述目标信道信息测量结果进行链路自适应调整。a sending unit 1730, configured to send a second PPDU to the target network device, wherein the second PPDU is used by the target network device to measure channel information using the second PPDU to obtain the target channel information measurement result, And perform link adaptive adjustment according to the target channel information measurement result.

可选地,在本实施例中,探测PPDU的模式包括探测PPDU的带宽信息、探测PPDU采用室内模式还是室外模式、探测PPDU的长训练字段的傅里叶变化阶数信息以及探测PPDU的保护间隔信息中的至少一个。Optionally, in this embodiment, the mode of detecting the PPDU includes bandwidth information of the detecting PPDU, detecting whether the PPDU adopts the indoor mode or the outdoor mode, detecting the Fourier transform order information of the long training field of the detecting PPDU, and detecting the guard interval of the PPDU. at least one of the information.

可选地,在本实施例中,所述探测PPDU的模式包括探测PPDU采用室内模式还是室外模式;当所述模式指示字段指示目标网络设备生成室外模式的探测PPDU时,所述第二PPDU为所述目标网络设备根据所述模式指示字段生成的增强性的探测PPDU;Optionally, in this embodiment, the mode of detecting the PPDU includes detecting whether the PPDU adopts the indoor mode or the outdoor mode; when the mode indication field instructs the target network device to generate the detection PPDU in the outdoor mode, the second PPDU is the enhanced probe PPDU generated by the target network device according to the mode indication field;

其中,所述增强性的探测PPDU是指具有以下格式中的至少一种的探测PPDU:Wherein, the enhanced sounding PPDU refers to a sounding PPDU having at least one of the following formats:

所述探测PPDU的前导码的至少一个符号在时域或频域上进行部分或者全部的复制,所述探测PPDU的部分或全部符号间的保护间隔大于第一预设值,所述探测PPDU的至少一个符号的调制编码方式MCS满足某一预设条件,以及所述探测PPDU的至少一个符号的傅里叶变化阶数高于第二预设值。At least one symbol of the preamble of the sounding PPDU is partially or completely copied in the time domain or frequency domain, the guard interval between some or all symbols of the sounding PPDU is greater than the first preset value, and the The modulation and coding mode MCS of at least one symbol satisfies a certain preset condition, and the Fourier transform order of at least one symbol of the probe PPDU is higher than a second preset value.

可选地,在本实施例中,所述信道信息包括信道的扩展延迟和/或多用户间的延迟;Optionally, in this embodiment, the channel information includes channel spreading delay and/or multi-user delay;

所述第二PPDU用于所述目标网络设备使用所述第二PPDU测量信道的扩展延迟和/或多用户间的延迟,并根据测量得到的信道的扩展延迟和/或多用户间的延迟进行保护间隔的自适应调整。The second PPDU is used by the target network device to use the second PPDU to measure the spread delay of the channel and/or the delay between multiple users, and perform the measurement according to the measured spread delay of the channel and/or the delay between multiple users. Adaptive adjustment of guard interval.

可选地,在本实施例中,所述信道信息包括信道的SNR;Optionally, in this embodiment, the channel information includes the SNR of the channel;

所述第二PPDU用于所述目标网络设备使用所述第二PPDU测量信道的SNR,并根据测量得到的信道的SNR进行MCS的自适应调整。The second PPDU is used by the target network device to measure the SNR of the channel by using the second PPDU, and perform adaptive adjustment of the MCS according to the measured SNR of the channel.

下面对非请求-反馈机制的一种网络设备进行描述,具体请参阅图18,本发明实施例中网络设备的方法另一实施例包括:A network device of the unsolicited-feedback mechanism is described below. For details, please refer to FIG. 18. Another embodiment of the method for the network device in the embodiment of the present invention includes:

本发明实施例中的网络设备可以实现图12所示实施例的流程,所述网络设备包括:The network device in the embodiment of the present invention can implement the process of the embodiment shown in FIG. 12 , and the network device includes:

第二接收模块1811,用于接收目标网络设备发送的PPDU;其中,所述PPDU指示目标网络设备主动发送信道信息测量结果,所述PPDU还包括模式指示字段,所述模式指示字段用于指示目标网络设备测量信道信息所使用的探测PPDU的模式;The second receiving module 1811 is configured to receive the PPDU sent by the target network device; wherein, the PPDU indicates that the target network device actively sends the channel information measurement result, and the PPDU further includes a mode indication field, which is used to indicate the target The mode of the probe PPDU used by the network device to measure the channel information;

第二获取模块1812,用于根据所述模式指示字段确定目标信道信息测量结果;a second obtaining module 1812, configured to determine the target channel information measurement result according to the mode indication field;

调整单元1820,用于根据所述目标信道信息测量结果进行链路自适应调整。An adjustment unit 1820, configured to perform link adaptation adjustment according to the target channel information measurement result.

可选地,在本实施例中,探测PPDU的模式包括探测PPDU的带宽信息、探测PPDU采用室内模式还是室外模式、探测PPDU的长训练字段的傅里叶变化阶数信息以及探测PPDU的保护间隔信息中的至少一个。Optionally, in this embodiment, the mode of detecting the PPDU includes bandwidth information of the detecting PPDU, detecting whether the PPDU adopts the indoor mode or the outdoor mode, detecting the Fourier transform order information of the long training field of the detecting PPDU, and detecting the guard interval of the PPDU. at least one of the information.

可选地,在本实施例中,所述信道信息包括信道的扩展延迟和/或多用户间的延迟;Optionally, in this embodiment, the channel information includes channel spreading delay and/or multi-user delay;

所述调整单元1820,具体用于根据所述目标信道信息测量结果进行保护间隔的自适应调整。The adjusting unit 1820 is specifically configured to perform adaptive adjustment of the guard interval according to the target channel information measurement result.

可选地,在本实施例中,所述信道信息包括信道的SNR;Optionally, in this embodiment, the channel information includes the SNR of the channel;

所述调整单元1820,具体用于根据所述目标信道信息测量结果进行调制编码策略MCS的自适应调整。The adjusting unit 1820 is specifically configured to perform adaptive adjustment of the modulation and coding strategy MCS according to the target channel information measurement result.

本发明实施例提供的技术方案中,网络设备的第二接收模块1811接收目标网络设备发送的PPDU,其中,该PPDU指示目标网络设备主动发送信道信息测量结果,且该PPDU还包括模式指示字段,该模式指示字段用于指示目标网络设备测量信道信息所使用的探测PPDU的模式;并由第二获取模块1812根据模式指示字段确定目标信道信息测量结果;再通过调整单元1820根据该目标信道信息测量结果进行链路自适应调整,由此,所述网络设备可以灵活选择使用哪个模式的探测PPDU测量信道信息得到的测量结果进行链路自适应调整。因此相对于现有技术,本发明实施例在PPDU中还携带有模式指示字段,以对测量信道信息所使用的探测PPDU的模式进行指定,以便所述网络设备获知信道信息测量结果是使用哪种模式的探测PPDU测量得到的,由此,本发明实施例可灵活获取使用某一特定模式的探测PPDU测量信道信息得到的测量结果,以适配不同应用场景下的不同需求,提高信道信息测量的灵活度,从而为用户提供准确的链路自适应。In the technical solution provided by the embodiment of the present invention, the second receiving module 1811 of the network device receives a PPDU sent by the target network device, where the PPDU instructs the target network device to actively send the channel information measurement result, and the PPDU further includes a mode indication field, The mode indication field is used to indicate the mode of the probe PPDU used by the target network device to measure the channel information; and the second acquisition module 1812 determines the target channel information measurement result according to the mode indication field; and then the adjustment unit 1820 measures the target channel information according to the mode indication field. As a result, the link adaptive adjustment is performed, whereby the network device can flexibly select which mode of the probing PPDU measurement channel information is used to perform the link adaptive adjustment. Therefore, compared with the prior art, the embodiment of the present invention also carries a mode indication field in the PPDU, so as to specify the mode of the probe PPDU used to measure the channel information, so that the network device can know which channel information measurement result is used. Therefore, the embodiment of the present invention can flexibly obtain measurement results obtained by measuring channel information using a probe PPDU of a certain mode, so as to adapt to different requirements in different application scenarios and improve the accuracy of channel information measurement. flexibility to provide users with accurate link adaptation.

下面对非请求-反馈机制的另一网络设备进行描述,具体请参阅图19,本发明实施例中网络设备的方法另一实施例包括:Another network device of the unsolicited-feedback mechanism is described below. For details, please refer to FIG. 19. Another embodiment of the method for the network device in the embodiment of the present invention includes:

本发明实施例中的网络设备可以实现图13所示实施例的流程,所述网络设备包括:The network device in the embodiment of the present invention can implement the process of the embodiment shown in FIG. 13 , and the network device includes:

生成单元1901,用于生成PPDU;其中,所述PPDU指示所述网络设备主动发送信道信息测量结果,所述PPDU还包括模式指示字段,所述模式指示字段用于指示所述网络设备测量信道信息所使用的探测PPDU的模式;A generating unit 1901, configured to generate a PPDU; wherein the PPDU instructs the network device to actively send a channel information measurement result, the PPDU further includes a mode indication field, and the mode indication field is used to instruct the network device to measure the channel information The mode of the probe PPDU used;

发送单元1902,用于向目标网络设备发送所述PPDU,其中,所述PPDU用于所述目标网络设备根据所述模式指示字段确定目标信道信息测量结果,并根据所述目标信道信息测量结果进行链路自适应调整。The sending unit 1902 is configured to send the PPDU to the target network device, wherein the PPDU is used by the target network device to determine the target channel information measurement result according to the mode indication field, and perform the measurement according to the target channel information measurement result. Link adaptive adjustment.

可选地,在本实施例中,探测PPDU的模式包括探测PPDU的带宽信息、探测PPDU采用室内模式还是室外模式、探测PPDU的长训练字段的傅里叶变化阶数信息以及探测PPDU的保护间隔信息中的至少一个。Optionally, in this embodiment, the mode of detecting the PPDU includes bandwidth information of the detecting PPDU, detecting whether the PPDU adopts the indoor mode or the outdoor mode, detecting the Fourier transform order information of the long training field of the detecting PPDU, and detecting the guard interval of the PPDU. at least one of the information.

可选地,在本实施例中,所述信道信息包括信道的扩展延迟和/或多用户间的延迟;Optionally, in this embodiment, the channel information includes channel spreading delay and/or multi-user delay;

所述PPDU用于所述目标网络设备根据所述模式指示字段确定目标信道信息测量结果,并根据所述目标信道信息测量结果进行保护间隔的自适应调整。The PPDU is used by the target network device to determine the target channel information measurement result according to the mode indication field, and to perform adaptive adjustment of the guard interval according to the target channel information measurement result.

可选地,在本实施例中,所述信道信息包括信道的信噪比SNR;Optionally, in this embodiment, the channel information includes a signal-to-noise ratio SNR of the channel;

所述PPDU用于所述目标网络设备根据所述模式指示字段确定目标信道信息测量结果,并根据所述目标信道信息测量结果进行MCS的自适应调整。The PPDU is used by the target network device to determine the target channel information measurement result according to the mode indication field, and to perform adaptive adjustment of the MCS according to the target channel information measurement result.

所属领域的技术人员可以清楚地了解到,为描述的方便和简洁,上述描述的系统,装置和单元的具体工作过程,可以参考前述方法实施例中的对应过程,在此不再赘述。Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system, device and unit described above may refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

在本申请所提供的几个实施例中,应该理解到,所揭露的系统,装置和方法,可以通过其它的方式实现。例如,以上所描述的装置实施例仅仅是示意性的,例如,所述单元的划分,仅仅为一种逻辑功能划分,实际实现时可以有另外的划分方式,例如多个单元或组件可以结合或者可以集成到另一个系统,或一些特征可以忽略,或不执行。另一点,所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口,装置或单元的间接耦合或通信连接,可以是电性,机械或其它的形式。In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

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单元来实现本实施例方案的目的。The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

另外,在本发明各个实施例中的各功能单元可以集成在一个处理单元中,也可以是各个单元单独物理存在,也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现,也可以采用软件功能单元的形式实现。In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.

所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时,可以存储在一个计算机可读取存储介质中。基于这样的理解,本发明的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来,该计算机软件产品存储在一个存储介质中,包括若干指令用以使得一台计算机设备(可以是个人计算机,服务器,或者网络设备等)执行本发明各个实施例所述方法的全部或部分步骤。而前述的存储介质包括:U盘、移动硬盘、只读存储器(ROM,Read-OnlyMemory)、随机存取存储器(RAM,Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。The integrated unit, if implemented in the form of a software functional unit and sold or used as an independent product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes: U disk, removable hard disk, Read-Only Memory (ROM, Read-Only Memory), Random Access Memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes.

以上所述,以上实施例仅用以说明本发明的技术方案,而非对其限制;尽管参照前述实施例对本发明进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand: The technical solutions described in the embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (38)

1. A method for link adaptation in a W L AN, comprising:
a first network device receives a physical layer protocol data unit (PPDU) sent by a second network device; the PPDU comprises information indicating that the second network device actively sends a channel information measurement result, and a mode indication field, where the mode indication field is used to indicate a mode of a target sounding PPDU used by the second network device to measure channel information, and the PPDU further comprises the channel information measurement result;
the first network equipment acquires the channel information measurement result, wherein the channel information measurement result is obtained by the second network equipment according to the target detection PPDU measurement;
and the first network equipment performs link self-adaptive adjustment according to the channel information measurement result.
2. The method of claim 1, wherein the channel information measurement results comprise: a proposed number of space-time streams, a proposed modulation and coding scheme, MCS, and a bandwidth employed by the proposed MCS.
3. The method of claim 1, wherein the instructing the second network device to actively send the information of the channel information measurement result specifically comprises: the Unsolicited MCS feedback in the PPDU directs an unoiled MFB field to set 1, indicating that the second network device actively sends the channel information measurement result.
4. The method of claim 1, wherein the PPDU further comprises a bandwidth BW field for indicating a bandwidth of the target sounding PPDU.
5. The link adaptation method of the W L AN of claim 1, wherein the mode of the sounding PPDU comprises at least one of whether the sounding PPDU employs AN indoor mode or AN outdoor mode, fourier transform order information of a long training field of the sounding PPDU, and guard interval information of the sounding PPDU.
6. The link adaptation method of W L AN according to any one of claims 1 to 5, wherein the channel information includes AN extended delay of a channel and/or a delay between multiple users;
the first network device performing link adaptive adjustment according to the channel information measurement result includes:
and the first network equipment performs self-adaptive adjustment of the guard interval according to the channel information measurement result.
7. The link adaptation method of W L AN according to any one of claims 1 to 5,
the first network device performing link adaptive adjustment according to the channel information measurement result includes:
and the first network equipment carries out the self-adaptive adjustment of the modulation and coding strategy MCS according to the channel information measurement result.
8. A method for link adaptation in a W L AN, comprising:
the second network equipment receives a physical layer protocol data unit (PPDU) sent by the first network equipment; wherein the PPDU indicates that the second network device needs to send a sounding PPDU, and the PPDU further includes a mode indication field, and the mode indication field is used for indicating the second network device to generate a sounding PPDU of a target mode;
the second network equipment generates a detection PPDU of a target mode according to the mode indication field;
and the second network equipment sends the detection PPDU in the target mode to the first network equipment, wherein the detection PPDU in the target mode is used for the first network equipment to measure channel information by using the detection PPDU in the target mode to obtain a channel information measurement result, and performs link self-adaptive adjustment according to the channel information measurement result.
9. The link adaptation method of a W L AN of claim 8, wherein the mode of the sounding PPDU comprises at least one of bandwidth information of the sounding PPDU, whether the sounding PPDU employs AN indoor mode or AN outdoor mode, fourier change order information of a long training field of the sounding PPDU, and guard interval information of the sounding PPDU.
10. The link adaptation method of the W L AN of claim 8, wherein the mode of the sounding PPDU includes whether the sounding PPDU employs AN indoor mode or AN outdoor mode;
when the mode indication field indicates that the second network device generates a sounding PPDU in an outdoor mode, the second network device generating a sounding PPDU in a target mode according to the mode indication field includes:
the second network equipment generates an enhanced detection PPDU according to the mode indication field;
wherein the enhanced sounding PPDU refers to a sounding PPDU having at least one of the following formats:
at least one symbol of a preamble of the sounding PPDU is partially or completely copied in a time domain or a frequency domain, a guard interval between partial or all symbols of the sounding PPDU is larger than a first preset value, a Modulation and Coding Scheme (MCS) of at least one symbol of the sounding PPDU meets a certain preset condition, and a Fourier change order of at least one symbol of the sounding PPDU is higher than a second preset value.
11. The link adaptation method of W L AN according to any one of claims 8 to 10, wherein the channel information includes AN extended delay of a channel and/or a delay between multiple users;
and the target mode sounding PPDU is used for the first network equipment to measure the extension delay of the channel and/or the delay among multiple users by using the target mode sounding PPDU, and to perform the self-adaptive adjustment of the guard interval according to the measured extension delay of the channel and/or the delay among multiple users.
12. The method of any one of claims 8 to 10, wherein the channel information measurement result comprises: a proposed number of space-time streams, a proposed modulation and coding scheme, MCS, and a bandwidth employed by the proposed MCS.
13. A method for link adaptation in a W L AN, comprising:
the second network equipment generates a physical layer protocol data unit PPDU; the PPDU comprises information indicating that the second network equipment actively sends a channel information measurement result, and further comprises a mode indication field, wherein the mode indication field is used for indicating a mode of a target sounding PPDU used by the second network equipment for measuring the channel information;
and the second network equipment sends the PPDU to the first network equipment, wherein the PPDU comprises the channel information measurement result, the channel information measurement result is obtained by the second network equipment according to the measurement of the target detection PPDU, and the channel information measurement result is used for the first network equipment to carry out link self-adaptive adjustment.
14. The method of claim 13, wherein the channel information measurement result comprises: a proposed number of space-time streams, a proposed modulation and coding scheme, MCS, and a bandwidth employed by the proposed MCS.
15. The method of claim 13, wherein the information instructing the second network device to actively send channel information measurement results comprises: and setting 1 in an unoiled MFB field in the PPDU, and indicating the second network equipment to actively send the channel information measurement result.
16. The method of claim 13, wherein the PPDU further comprises a BW field for indicating a bandwidth of the target sounding PPDU.
17. The link adaptation method of a W L AN of claim 13, wherein the mode of the sounding PPDU comprises at least one of whether the sounding PPDU employs AN indoor mode or AN outdoor mode, fourier transform order information of a long training field of the sounding PPDU, and guard interval information of the sounding PPDU.
18. The link adaptation method of W L AN of claim 13, wherein the channel information includes AN extended delay of a channel and/or a delay between multiple users;
and the PPDU is used for the first network equipment to determine a channel information measurement result according to the mode indication field and to perform self-adaptive adjustment of a guard interval according to the channel information measurement result.
19. The link adaptation method of W L AN of claim 13, wherein the PPDU is used by the first network device to determine a channel information measurement result according to the mode indication field and to perform adaptive adjustment of MCS according to the channel information measurement result.
20. A network device, comprising:
the receiving module is used for receiving a physical layer protocol data unit PPDU sent by target network equipment; the PPDU includes information indicating that the target network device actively sends a channel information measurement result, and a mode indication field, where the mode indication field is used to indicate a mode of a target sounding PPDU used by the target network device to measure channel information, and the PPDU also includes the channel information measurement result;
an obtaining module, configured to obtain the channel information measurement result, where the channel information measurement result is obtained by the target network device according to the target sounding PPDU;
and the adjusting unit is used for carrying out link self-adaptive adjustment according to the channel information measurement result.
21. The network device of claim 20, wherein the channel information measurement results comprise: a proposed number of space-time streams, a proposed modulation and coding scheme, MCS, and a bandwidth employed by the proposed MCS.
22. The network device of claim 20, wherein the information instructing the target network device to actively send the channel information measurement result specifically comprises: the unsolicited MCS feedback in the PPDU directs the UnsulcittedMFB field to set 1, indicating that the target network device is actively sending the channel information measurement result.
23. The network device of claim 20, wherein the PPDU further comprises a bandwidth BW field for indicating a bandwidth of the targeted sounding PPDU.
24. The network device of claim 20, wherein the mode of the sounding PPDU comprises at least one of whether the sounding PPDU employs an indoor mode or an outdoor mode, fourier transform order information of a long training field of the sounding PPDU, and guard interval information of the sounding PPDU.
25. The network device according to any of claims 20 to 24, wherein the channel information comprises an extension delay of a channel and/or a delay between multiple users;
the adjusting unit is specifically configured to perform adaptive adjustment of a guard interval according to the channel information measurement result.
26. The network device according to one of claims 20 to 24, wherein the adjusting unit is specifically configured to perform adaptive adjustment of a modulation and coding scheme, MCS, according to the channel information measurement result.
27. A network device, comprising:
a receiving unit, configured to receive a physical layer protocol data unit PPDU sent by a target network device; the PPDU indicates that the network equipment needs to send a sounding PPDU, and the PPDU further comprises a mode indication field, wherein the mode indication field is used for indicating the network equipment to generate a sounding PPDU in a target mode;
a generating unit, configured to generate a sounding PPDU of a target mode according to the mode indication field;
and a sending unit, configured to send the sounding PPDU in the target mode to the target network device, where the sounding PPDU in the target mode is used by the target network device to measure channel information using the sounding PPDU in the target mode to obtain a channel information measurement result, and perform link adaptive adjustment according to the channel information measurement result.
28. The network device of claim 27, wherein the mode of the sounding PPDU comprises at least one of bandwidth information of the sounding PPDU, whether the sounding PPDU employs an indoor mode or an outdoor mode, fourier transform order information of a long training field of the sounding PPDU, and guard interval information of the sounding PPDU.
29. The network device of claim 27, wherein the mode of the sounding PPDU comprises whether the sounding PPDU employs an indoor mode or an outdoor mode;
when the mode indication field indicates that the network device generates a sounding PPDU in an outdoor mode, the generating unit is specifically configured to generate an enhanced sounding PPDU according to the mode indication field;
wherein the enhanced sounding PPDU refers to a sounding PPDU having at least one of the following formats:
at least one symbol of a preamble of the sounding PPDU is partially or completely copied in a time domain or a frequency domain, a guard interval between partial or all symbols of the sounding PPDU is larger than a first preset value, a Modulation and Coding Scheme (MCS) of at least one symbol of the sounding PPDU meets a certain preset condition, and a Fourier change order of at least one symbol of the sounding PPDU is higher than a second preset value.
30. The network device according to any of claims 27 to 29, wherein the channel information comprises an extension delay of a channel and/or a delay between multiple users;
the target mode of the sounding PPDU is used for the target network device to measure the extension delay of the channel and/or the delay among multiple users by using the target mode of the sounding PPDU, and the self-adaptive adjustment of the guard interval is carried out according to the measured extension delay of the channel and/or the delay among multiple users.
31. The network device of any of claims 27 to 29, wherein the channel information measurement result comprises: a proposed number of space-time streams, a proposed modulation and coding scheme, MCS, and a bandwidth employed by the proposed MCS.
32. A network device, comprising:
a generating unit, configured to generate a physical layer protocol data unit PPDU; the PPDU comprises information indicating that the network equipment actively sends a channel information measurement result, and further comprises a mode indication field, wherein the mode indication field is used for indicating a mode of a target sounding PPDU used by the network equipment for measuring the channel information;
a sending unit, configured to send the PPDU to a target network device, where the PPDU includes the channel information measurement result, the channel information measurement result is obtained by the network device according to the target sounding PPDU, and the channel information measurement result is used for performing link adaptive adjustment by the target network device.
33. The network device of claim 32, wherein the channel information measurement result comprises: a proposed number of space-time streams, a proposed modulation and coding scheme, MCS, and a bandwidth employed by the proposed MCS.
34. The network device of claim 32, wherein the information instructing the network device to actively send channel information measurements comprises: and setting 1 in an unoiled MFB field in the PPDU, and indicating the network equipment to actively send a channel information measurement result.
35. The network device of claim 32, wherein the PPDU further comprises a BW field indicating a bandwidth of the targeted sounding PPDU.
36. The network device of claim 32, wherein the mode of the sounding PPDU comprises at least one of whether the sounding PPDU employs an indoor mode or an outdoor mode, fourier transform order information of a long training field of the sounding PPDU, and guard interval information of the sounding PPDU.
37. The network device of claim 32, wherein the channel information comprises an extended delay of a channel and/or a delay between multiple users;
and the PPDU is used for the target network equipment to determine a channel information measurement result according to the mode indication field and to perform self-adaptive adjustment of a guard interval according to the channel information measurement result.
38. The network device of claim 32, wherein the PPDU is configured for the target network device to determine a channel information measurement result according to the mode indication field and to perform adaptive adjustment of an MCS according to the channel information measurement result.
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