WO2014146440A1

WO2014146440A1 - Service discovery method, access point, and station

Info

Publication number: WO2014146440A1
Application number: PCT/CN2013/087219
Authority: WO
Inventors: 陶源; 杨浔; 姜艳平
Original assignee: 华为技术有限公司
Priority date: 2013-03-19
Filing date: 2013-11-15
Publication date: 2014-09-25
Also published as: CN104066148A; CN104066148B

Abstract

The embodiments of the present invention relate to a service discovery method, an access point, and a station. The method comprises: classifying each piece of service information according to content of each piece of service information to obtain different service information groups; determining broadcast time of each service information group, and establishing service categories according to the broadcast time of the service information group as well as the information identification; adding the service information group and the service categories into a broadcast frame; determining a broadcast period of the broadcast frame, and periodically sending the broadcast frame to a station, so that the station finds service information required by the station from the service information group of the broadcast frame or obtain the broadcast time of the service information group where the service information required by the station from the service categories of the broadcast frame. Therefore, in the present invention, all service information is classified and then sent to an STA by means of an AP, and the STA receives required service information in an obtained time point and does not need to receive all service information, which reduces the power consumption of the STA and can support passive service discovery of a large volume of data.

Description

Service discovery methods, access points and sites

The present invention relates to the field of communications technologies, and in particular, to a service discovery method, an access point, and a site. Background technique

With the development of communication technology, Wireless Local Area Network (WLAN) usually adopts service discovery based on Access Point (AP), that is, the site needs to be first and After the AP associates with the establishment of the communication link, it knows which services the AP can provide.

Currently, there are two ways to discover services: active service discovery and passive service discovery. The method of actively discovering the service means that the STA actively sends a service request to the service device. If the service device can provide the service required by the STA, the service response is sent to the STA. The passive discovery service means that the STA waits for and receives the service device broadcast service information, and finds the service information it needs.

The process of passive service discovery is as follows: The AP broadcasts the service information in a broadcast frame, for example, broadcasts through a beacon, and the STA discovers the desired service information by receiving a broadcast frame.

However, in some scenarios, there are many types of services and a large amount of data. If the AP broadcasts all service information in a beacon, it will cause a high channel occupancy rate in a certain period of time. Assuming that more than one AP is broadcasting information at the same time, it is likely to cause collision of information. When a collision occurs, all service information will be lost and only the next beacon (Beacon) will be waiting. For the STA, it needs to be in the listening state all the time, and receive detailed information of all types of services in the broadcast frame, but in fact most of them are not required, and the power consumption on the STA side is high. Summary of the invention

The present invention provides a service discovery method, an access point and a site to solve the prior art In a scenario where the service type is large and the amount of data is large, all the service information is broadcasted in a beacon, and the STA needs to be in the listening state all the time, and receives a large amount of unnecessary information, thereby causing high power consumption on the STA side. The problem is that the service information is classified and sent to the STA by using the UI, and the STA receives the required service information at the time of obtaining, without receiving all the service information, reducing the power consumption of the STA, and supporting the passive service of the large data volume. Find.

In a first aspect, the present invention provides a service discovery method, the method comprising: an access point classifying each service information according to a content of each service information to obtain different service information groups, each service information group having an information identifier The content of the service information in each service information group belongs to a service type corresponding to the information identifier; the access point determines a broadcast time of each service information group, and according to the broadcast of the service information group a time and information identifier establishing a service directory, the service directory including a broadcast time and an information identifier of all service information groups; the access point adding the service information group and the service directory to a broadcast frame; Determining a broadcast period of the broadcast frame, and periodically transmitting the broadcast frame to the station according to the broadcast period, where the station finds service information required by the station from the service information group of the broadcast frame or from the location The broadcast time of the service information group in which the service information required by the self is located is obtained in the service directory of the broadcast frame.

In a first possible implementation, the service directory further includes summary information of the service information in each service information group, where the service information group and the service directory are added to a broadcast frame, The method includes: adding the service information group to each of the broadcast frames, and adding the service directory to each of the broadcast frames, so that the service information groups carried by the respective broadcast frames are different, and each of the The service directories carried by the broadcast frames are all the same, and each broadcast frame carries a service directory and a type of service information group.

In a second possible implementation manner, the determining a broadcast time of each service information group, and establishing a service directory according to the broadcast time and the information identifier of the service information group, further includes: according to each service The broadcast time of the packet determines the broadcast time of the service catalog.

With reference to the second possible implementation manner of the first aspect, in a third possible implementation manner, the broadcast frame includes: a first broadcast frame and a second broadcast frame; Adding the service directory to the broadcast frame includes: adding the service directory to the first broadcast frame, and adding the broadcast time of the service directory and the service information group to different second broadcast frames, so that each The service information group carried by the second broadcast frame is different.

In a second aspect, the present invention provides a service discovery method, the method comprising: receiving, by a station, a broadcast frame that carries a service directory and a service information group, where the service directory includes information identifiers and services of service information. Broadcast time of the information group; discovering the service information required by itself from the service information group of the broadcast frame or learning the broadcast time of the service information group in which the service information required by the self is required from the service directory of the broadcast frame .

In a first possible implementation, the service information required by the service information group of the broadcast frame is found, or the service information required by the self is obtained from the service directory of the broadcast frame. The broadcast time of the service information group includes: when the service information group of the received broadcast frame includes the service information required by the user, the station stops receiving other information sent by the access point. a broadcast frame; when the service information group of the received broadcast frame does not include the service information required by the self, the station learns, from the service directory, the service information required by the service itself. After the broadcast time of the service information group, the user enters the dormant state, enters the receiving state at the broadcast time of the service information group where the service information required by the user is located, and discovers the service information required by the user from the received broadcast frame. .

In a second possible implementation, the service information required by the service information group of the broadcast frame is found, or the service information required by the self is obtained from the service directory of the broadcast frame. The broadcast time of the service information group includes: when the service information group of the received broadcast frame includes the service information required by the user, the station does not receive the other information sent by the access point. The service information is discarded for the other broadcast frames sent by the access point; when the service information group of the received broadcast frame does not include the service information required by the user, and the service is The information identifier of the service information and the broadcast time of the service information group corresponding to the service information required by the self exist in the directory, and the broadcast frame is received at the broadcast time of the service information group, and received from the broadcast information The service information required by the self is found in the broadcast frame, The other broadcast frames sent by the access point are discarded; when the service information group of the received broadcast frame does not include the service information required by the user, and the service directory does not exist. The information identifier of the service information corresponding to the service information required by the user and the broadcast time of the service information group, the site no longer receives the service information sent by the access point, and sends the service information to the access point. Other broadcast frames are discarded.

In a third possible implementation, the broadcast frame includes a first broadcast frame and a second broadcast frame, and the receiving, by the station, the broadcast frame that carries the service information group and the service directory sent by the access point, includes: receiving the a first broadcast frame carried by the access point carrying the service directory, and a second broadcast frame that receives the broadcast time of the service directory and the service information group, where the service information group carried by each second broadcast frame They are all different.

In a third aspect, the present invention provides an access point, where the access point includes: a classification unit, configured to classify each service information according to the content of each service information, to obtain different service information groups, and each service information The group has a message identifying the summary information of each service information, the content of the service information in each service information group belongs to the service type corresponding to the information identifier, and transmits the service information group to the processing unit; And receiving, by the classification unit, the service information group, determining a broadcast time of each service information group, and establishing a service directory according to a broadcast time and an information identifier of the service information group, where the service directory includes all a broadcast time and information identifier of the service information group, and transmitting the service information group and the service directory to the adding unit; and an adding unit, configured to receive the service information group and the service directory from the processing unit, The service information group and the service directory are added to a broadcast frame, and the broadcast frame is transmitted to the broadcast frame a sending unit, configured to receive the broadcast frame from the adding unit, determine a broadcast period of the broadcast frame, and periodically send the broadcast frame to the station according to the broadcast period, where the station uses the broadcast frame The service information group finds the service information required by itself or the broadcast time of the service information group in which the service information required by the user is located from the service directory of the broadcast frame.

In a first possible implementation manner, the service directory further includes summary information of service information in each service information group, where the adding unit is configured to separately add the service information group to Each of the broadcast frames is added to the respective broadcast frames, so that the service information groups carried by the broadcast frames are different, and the service directories carried by the broadcast frames are the same. Each broadcast frame carries a service directory and a type of service information group.

In a second possible implementation manner, the service directory further includes summary information of service information in each service information group, where the processing unit is further configured to determine, according to a broadcast time of each service information group The broadcast time of the service directory.

With reference to the second possible implementation manner of the third aspect, in a third possible implementation manner, the broadcast frame includes: a first broadcast frame and a second broadcast frame; and the adding unit is configured to use the service directory Adding to the first broadcast frame, and adding the broadcast time of the service directory and the service information group to different second broadcast frames, so that the service information groups carried by the respective second broadcast frames are different.

In a fourth aspect, the present invention provides a station, where the station includes: a receiving unit, configured to receive a broadcast frame that carries a service directory and a service information group sent by an access point, where the service directory includes an information identifier of the service information. And a broadcast time of the service information group, and transmitting the broadcast frame to the discovery unit; the discovery unit, configured to receive the broadcast frame from the receiving unit, and discover the required information from the service information group of the broadcast frame The service information or the broadcast time of the service information group in which the service information required by the self is required is obtained from the service directory of the broadcast frame.

In a first possible implementation manner, the discovery unit is configured to: when the received service information group of the broadcast frame includes the service information required by the user, the station stops receiving the And another broadcast frame sent by the access point; when the service information group of the received broadcast frame does not include the service information required by the user, the site learns from the service directory After the broadcast time of the service information group in which the service information is required, the user enters the dormant state, enters the receiving state at the broadcast time of the service information group where the service information required by the user is located, and finds the received broadcast frame. Describe the service information you need.

In a second possible implementation, the discovery unit is configured to: when the received service information group of the broadcast frame includes the service information required by the user, the site is no longer received. The other service information sent by the access point is discarded for other broadcast frames sent by the access point; when the received service information group of the broadcast frame does not include the self required Service information, and the information identifier of the service information corresponding to the service information required by the service and the broadcast time of the service information group are present in the service directory, and the broadcast is received at the broadcast time of the service information group. And discovering, from the received broadcast frame, the service information required by the self, and discarding other broadcast frames sent by the access point; when the received service of the broadcast frame is received The service group does not include the service information required by the self, and the information identifier of the service information corresponding to the service information required by the service and the broadcast time of the service information group do not exist in the service directory. The station does not receive the service information sent by the access point, and performs discarding processing on other broadcast frames sent by the access point.

In a third possible implementation, the broadcast frame includes a first broadcast frame and a second broadcast frame, where the receiving unit is configured to receive a first broadcast frame that is sent by the access point and that carries a service directory, and And receiving a second broadcast frame that carries the broadcast time of the service directory and the service information group, where the service information groups carried by each second broadcast frame are different.

By applying the service discovery method, the access point and the site disclosed by the present invention, the access point classifies the service information according to different service information groups according to the summary information of each service information, and the service information in each service information group belongs to the same service. Type, determining a broadcast time of each service information group, and establishing a service directory according to a broadcast time and an information identifier of the service information group, the service directory including a broadcast time and an information identifier of all service information groups, and the service information group and the The service directory is added to the broadcast frame, and the broadcast frame is sent to the station. After the station receives the broadcast frame that carries the service directory and the service information group sent by the access point, the service directory and the service directory are carried according to the broadcast frame. The service information group finds the service information required by itself, and implements the use of the AP to classify all the service information and send it to the STA, and the STA receives the required service information at the time of the knowledge, without receiving all the service information, and lowers the STA. Power consumption, capable of supporting passive data discovery with large amounts of data. DRAWINGS FIG. 1 is a flowchart of a service discovery method according to Embodiment 1 of the present invention;

2 is a schematic diagram of an access point sending a broadcast frame to a station according to Embodiment 2 of the present invention; FIG. 3 is a flowchart of a service discovery method according to Embodiment 3 of the present invention;

4 is a flowchart of a service discovery method according to Embodiment 4 of the present invention;

5 is a schematic diagram of an access point sending a broadcast frame to a station according to Embodiment 5 of the present invention; FIG. 6 is a schematic diagram of an access point sending a broadcast frame to a station according to Embodiment 6 of the present invention; A flowchart of the service discovery method provided;

8 is a schematic diagram of an access point according to Embodiment 8 of the present invention;

9 is a schematic diagram of a station provided in Embodiment 9 of the present invention;

FIG. 10 is a schematic diagram of an access point according to Embodiment 10 of the present invention;

FIG. 11 is a schematic diagram of a station according to Embodiment 11 of the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The service discovery method, the access point, and the site provided by the embodiment of the present invention, the access point is used by the site to discover service information required by the station from the service information group of the broadcast frame or from a service directory of the broadcast frame. Knowing the broadcast time of the service information group in which the service information required by the user is located, determining the broadcast time of each service information group, and summarizing the summary information of each service information and the broadcast of each service information group The time constitutes a service directory, the service information group and the service directory are added to the broadcast frame, and the broadcast frame is sent to the station, after the station receives the broadcast frame that carries the service directory and the service information group sent by the access point. And discovering the service information required by the service directory and the service information group carried by the broadcast frame, and realizing all service information by using the AP After being classified, it is sent to the STA, and the STA receives the required service information at the time of learning, without receiving all the service information, reducing the power consumption of the STA, and supporting the passive service discovery of a large amount of data.

The manner of the passive discovery service involved in all the embodiments of the present invention refers to: the access point AP sends a broadcast frame to the station STA, for example, the broadcast frame is a beacon Beacon, and the station STA waits for and receives the access point AP. The broadcast frame sent, from which to find the service information required by itself. The beacon is a management frame specified by the 802.11 standard and is periodically broadcasted by the AP.

FIG. 1 is a flowchart of a service discovery method according to Embodiment 1 of the present invention. As shown in the figure, the embodiment of the present invention specifically includes the following steps:

Step 1 1 0, the access point classifies each service information according to the content of each service information to obtain different service information groups, each service information group has an information identifier, and the service information in the content of each service information group belongs to and information. Identifies the corresponding service type. The content of the service information refers to the detailed content of the service information, and the summary information of the service information refers to the contents of the service information.

Specifically, the service information of the access point is provided by one or more STAs, where the STA is an AP site and a non-AP site, that is, one or more AP sites and non-AP sites providing services report the service information to the AP. The access point collects all service information and classifies it according to the summary information of each service information. For example, coffee shops, various restaurants, food supermarkets, etc. are classified as catering. The summary information of each service information refers to the package information of the service information, and the service type to which the service information belongs can be identified according to the package information, and the detailed content of the service information can also be known according to the package information. a part of. For example, the access point classifies all service information to obtain three service information groups: a service information group for food and beverage, a service information group for entertainment, and a service information group for transportation. The information of the service information group of the catering category is identified as catering; the information of the service information group of the entertainment category is identified as entertainment; and the information of the service information group of the transportation type is identified as traffic.

In addition, each service information group includes details of all service information of a service type corresponding to the information identifier, for example, the service information group carrying the catering category includes all service information of the service type corresponding to the information identifier corresponding to the catering. details.

Step 120: The access point determines a broadcast time of each service information group, and according to the service information group The broadcast time and information identification establish a service directory, which includes the broadcast time and information identification of all service information groups.

Specifically, the broadcast time of each service information group, for example, three service information groups: a service information group of a catering type, a service information group of a entertainment category, and a service information group of a traffic type, determine the three service information groups. Broadcast time. The information of the service information group of the catering category is identified as catering; the information of the service information group of the entertainment category is identified as entertainment; and the information of the service information group of the transportation type is identified as traffic. The service directory is established based on the broadcast time and information identification of the three service information groups.

In addition, the service catalog may also include summary information of the service information in each service information group. Therefore, the service directory includes not only the information identifier of all the service information groups, but also the bill information of all the service information provided by the access point AP, that is, the summary information of the service information in each service information group, and the service information corresponding thereto. The group broadcast time is the exact time at which the detailed content of each service information included in the service information group is broadcast, for example, the service information group of the catering class is transmitted after the first beacon period.

Step 1 30, the access point adds the service information group and the service directory to the broadcast frame.

Step 140: The access point determines a broadcast period of the broadcast frame, and periodically sends a broadcast frame to the station according to the broadcast period, where the station finds the service information required by the station from the service information group of the broadcast frame or from the service directory of the broadcast frame. The broadcast time of the service information group in which the service information required by itself is known.

In an embodiment, the service directory in step 130 further includes summary information of the service information in each service information group, and the access point adds the service information group to each broadcast frame separately, and adds the service directory separately. In each broadcast frame, the service information groups carried by each broadcast frame are different, and the service directories carried by each broadcast frame are the same.

Specifically, each broadcast frame carries a service directory and a type of service information group. The type of the service information group carried by each broadcast frame is different. For example, if the first broadcast frame carries a service directory and a service information group related to the catering, the second broadcast frame includes a service directory and entertainment. Related to a service information group, the third broadcast frame contains a service directory and A service information group related to the mode. Among them, the service directories included in all broadcast frames are the same. In one embodiment, in step 140, each broadcast frame carries a service directory and a type of service information group.

Specifically, the information element (Information Element, IE) format definition of the broadcast frame is as shown in Table 1. Information Element The IE is part of the 802.11 management frame, which consists of a frame header and a frame body. The frame entity includes a fixed domain and a series of information units. Information Element The IE consists of three parts: a 1-byte Element ID field, a 1-byte Length field, and a variable-length Inf ormat ion field.

Table 1

The above broadcast frame carries a service directory and detailed service information of a certain type of service, that is, a type of service information group. The Element ID is used to uniquely mark the IE; the Length is the length of the IE; the ServiceContent is the service directory; and the ServiceInfo is the detailed service information of a certain type of service, that is, a type of service information group.

In addition, when the access point sends a broadcast frame to the station in step 140, there may be a scheduled transmission broadcast frame. For example, three service information groups: a service information group for food and beverage, a service information group for entertainment, and a service information group for transportation. The access point sends the broadcast frame carrying the three service information groups to the station in multiple manners. For example, as shown in FIG. 2, the broadcast frame 21 carrying the service information group of the catering class is sent in the first place, and is carried. The broadcast frame 11 of the entertainment service information group is after the first beacon period, and the broadcast frame 23 carrying the traffic information group is after the second beacon period. The broadcast frame carrying the service information group of the catering class, the broadcast frame carrying the service information group of the entertainment class, and the broadcast frame carrying the service information group of the traffic class constitute a broadcast period, and the broadcast period is 3 beacon periods. In addition, the broadcast cycle can be cyclically transmitted multiple times according to actual conditions, and the length of the broadcast cycle can be changed according to the increase and decrease of the service type.

It is worth noting that in all embodiments of the invention the beacon period is defined as: from the first to be sent The period from the start of the broadcast frame until the second broadcast frame is sent is a beacon period. Therefore, the service discovery method provided by the embodiment of the present invention, the access point classifies the service information according to different service information groups according to the summary information of each service information, determines the broadcast time of each service information group, and according to the service information. The broadcast time and the information identifier of the group establish a service directory, the service directory includes a broadcast time and an information identifier of all service information groups, and the service information group and the service directory are added to the broadcast frame, and the broadcast frame is sent to the station. In the case that the service directory is small, it can be placed in each broadcast frame containing detailed service information of different service types, so that the broadcast containing other service information can be known regardless of which broadcast frame is received. The broadcast time of the frame, which can reduce the number of times the broadcast frame is received in some cases, and can discover the service more quickly.

FIG. 3 is a flowchart of a service discovery method according to Embodiment 3 of the present invention. The service discovery method performed by the site side provided by this embodiment corresponds to the service discovery method performed by the access point side provided in Embodiment 1. As shown in the figure, the embodiment of the present invention specifically includes the following steps:

Step 31 0: The station receives a broadcast frame that carries the service directory and the service information group sent by the access point. The service directory includes an information identifier of the service information and a broadcast time of the service information group.

Step 320: The station finds the service information required by itself from the service information group of the broadcast frame or the broadcast time of the service information group in which the service information required by itself is obtained from the service directory of the broadcast frame.

In one embodiment, each of the broadcast frames carries a service directory and a type of service information group. Each of the broadcast frames carries different service information groups, and each broadcast frame carries the same service directory. In this embodiment the service directory and service information set are in one broadcast frame, but the service directory and service information set may not be in one broadcast frame, as will be explained in detail in other embodiments. In step 320, after the station receives the broadcast frame sent by the access point, the broadcast frame adopts two different processing modes for performing a series of processing. The processing of each processing mode is as follows:

(1) The STA obtains a detailed service information containing the service it wants, that is, its own required service. The information group stops scanning. In this way, the STA can enter the sleep state at the time when it does not need to receive. The specific process is:

When the service information group of the received broadcast frame contains the service information required by itself, the station stops receiving other broadcast frames.

When the service information group of the received broadcast frame does not include the service information required by itself, the station learns from the service directory the broadcast time of the service information group in which the service information required by itself is the detailed service required by itself. After the exact broadcast time of the broadcast frame of the information, it enters the sleep state, and enters the reception state only at the broadcast time of the service information group in which the service information required by itself is received, thereby discovering the service required by the broadcast frame received at the time. information.

(2) The STA needs to scan all the time until it obtains the detailed service information that it needs to service, that is, the service information group required by itself. In this way, the STA must always be in the listening state. The specific process is:

When the service information group of the received broadcast frame contains the service information required by itself, the station simply does not receive other service information sent by the access point, and performs discard processing, and still receives other access points to send. Broadcast frame. Here, the discarding process involved in the embodiment of the present invention may be discarded without being unpacked, or may be a media access control (Medium Acces s Cont ro l, MAC) frame header, and the confirmation is that The broadcast frame sent by the AP is discarded. The MAC frame is divided into a data frame, a control frame, and a management frame. The Beacon we are talking about here is a management frame. The discarding process involved in the other embodiments of the present invention is the same, and the detailed description will not be repeated.

When the service information group of the received broadcast frame does not include the service information required by itself, and the service identifier of the service information corresponding to the service information required by itself and the broadcast time of the service information group exist in the service directory, the site Receiving a broadcast frame at the broadcast time of the service information group, and discovering the service information required by itself from the broadcast frame received at the time, and no longer receiving other service information of the access point, and the access point is Other broadcast frames are discarded. Because there may be multiple access point broadcast information, the site will still receive information from other access points.

However, when the service information group of the received broadcast frame does not contain the service information required by itself, And the service identifier of the service information corresponding to the service information required by the service directory and the broadcast time of the service information group do not exist in the service directory, the site no longer receives the service information sent by the access point, and the other information about the access point The broadcast frame is discarded.

Therefore, after the service discovery method provided by the embodiment of the present invention receives the broadcast frame carrying the service directory and the service information group sent by the access point, the service information of the broadcast frame is found from the service information group of the broadcast frame or Obtaining the broadcast time of the service information group in which the service information required by the self is located from the service directory of the broadcast frame, and realizing that when the service directory is small, it can be placed in each of the different service types. In the broadcast frame of the detailed service information, the station can know the broadcast time of the broadcast frame including other service information regardless of which broadcast frame is received, thereby reducing the number of times the broadcast frame is received in some cases, and the service can be found more quickly. .

FIG. 4 is a flowchart of a service discovery method according to Embodiment 4 of the present invention. As shown in the figure, the embodiment of the present invention specifically includes the following steps:

Step 41 0: The access point classifies the service information according to the content of each service information to obtain different service information groups. Each service information group has an information identifier, and the service information in the content of each service information group belongs to the information identifier. The corresponding service type classifies all service information of the access point according to different service information groups according to the summary information of each service information. The service information in the service information group belongs to the same service type, and the service information group includes content information of all service information belonging to the same service type. However, the types of service information in different service information groups are different. This step is the same as step 1 1 0 and will not be described here.

Step 420: The access point determines a broadcast time of each service information group, and establishes a service directory according to a broadcast time and an information identifier of the service information group, where the service directory includes a broadcast time and an information identifier of all service information groups, and determines a service directory. Broadcast time. This step is the same as step 1 20 and will not be described here. The service directory also includes summary information of the service information in each service information group.

Step 430: The access point adds the service directory to the first broadcast frame, and adds the broadcast time and the service information group of the service directory to different second broadcast frames, so that each second broadcast frame carries The service information groups are all different.

Specifically, in the embodiment of the present invention, the service directory and the service information group are in different broadcast frames, and the broadcast frame in which the service directory is located is defined as: a first broadcast frame, and the broadcast frame in which the service information group is located is defined as: Two broadcast frames. Since there may be multiple service information groups, there may be multiple second broadcast frames. For example, a second broadcast frame carrying a service information group of a catering class, a second broadcast frame carrying a service information group of the entertainment class, and a second broadcast frame carrying a service information group of the traffic class.

The information element IE format definition of the first broadcast frame carrying the service directory is as shown in Table 2. Element ID is used to uniquely identify IE; Length is the length of the IE; ServiceContent is the monthly directory information.

Table 2

Element ID Length ServiceContent The information element IE format definition of the second broadcast frame carrying the service information group is shown in Table 3. Element ID is used to uniquely mark IE; Length is the length of IE; Servi celnfo is the detailed service information of a certain type of service, that is, the content of the service information group; Time is the exact time of the Beacon broadcast carrying the service directory.

table 3

Step 440: The access point determines a broadcast period of the first broadcast frame and the second broadcast frame, and periodically sends the first broadcast frame and the second broadcast frame to the station according to the broadcast period, where the site uses the service directory of the first broadcast frame. The broadcast time of the service information group in which the service information required by itself is known is obtained, and the service information required by itself or the broadcast time of the service directory is found from the service information group of the second broadcast frame. There are many ways for the access point to send the first broadcast frame and the second broadcast frame to the station, and the first broadcast frame and the second broadcast frame may be scheduled to be sent.

In one embodiment, during the broadcast period, the first broadcast frame is sent only once, each carrying The second broadcast frames of different service information groups are sent once. For example, after the access point sends the first broadcast frame, the second broadcast frame is sent until all the second broadcast frames are sent to a broadcast period, and then the next broadcast period is executed. In addition, the access point may also send the second broadcast frame first, and then send the first broadcast frame. Wherein, regardless of the first broadcast frame or the second broadcast frame, the beacon period between every two broadcast frames is the same.

Specifically, the manner in which the access point sends the first broadcast frame and the second broadcast frame to the station, for example, the first broadcast frame carrying the service directory, the second broadcast frame carrying the service information group of the catering class, and the entertainment class The second broadcast frame of the service information group and the second broadcast frame carrying the service information group of the traffic class are transmitted in many ways. As shown in FIG. 5, the first broadcast frame 51 carrying the service directory is transmitted in the first place, and the second broadcast frame 52 carrying the service information group of the catering class is arranged after the first beacon period, and carries the entertainment service. The second broadcast frame 53 of the packet is after the second beacon period, and the second broadcast frame 54 carrying the traffic information group of the traffic class is after the third beacon period. The first broadcast frame 51 carrying the service directory, the second broadcast frame 52 carrying the service information group of the catering class, the second broadcast frame 53 carrying the service information group of the entertainment class, and the service information group carrying the traffic class The second broadcast frame 54 constitutes a broadcast period which is 4 beacon periods. In addition, the broadcast period can be transmitted multiple times according to the actual situation. The sending period of the first broadcast frame 51 carrying the service directory is 4 beacon periods.

In still another embodiment, during the broadcast period, the first broadcast frame is sent multiple times, and each second broadcast frame carrying a different service information group is sent once, and a sum is sent before or after each second broadcast frame is sent. a plurality of first broadcast frames, wherein the number of bytes occupied by the first broadcast frame is smaller than the number of bytes occupied by the second broadcast frame. For example, the format of the IE frame of the first broadcast frame and the second broadcast frame is as shown in Table 3. The access point may sequentially transmit the second broadcast frame, and send the first broadcast frame between the respective second broadcast frames until all the second broadcast frames are transmitted as one broadcast period, and then execute the next broadcast period. The first broadcast frame is sent between the two second broadcast frames. In this embodiment, the first broadcast frame with a higher transmission frequency is used to carry the service directory, so as to improve the site receiving the service directory. Probability, making the site discover services faster. Specifically, in the embodiment of the present invention, the first broadcast frame with a smaller number of occupied bytes is customized as a short message mark; and the second broadcast frame with a larger number of occupied bytes is customized as a long beacon. When the access point sequentially sends the second broadcast frame, for example, the second broadcast frame that first carries the service information group carrying the catering class, the second broadcast frame that carries the service information group that carries the entertainment class, and finally sends the traffic class. The second broadcast frame of the service information group is sent in the order. However, one or more first broadcast frames, ie, short beacons, are also transmitted between the two second broadcast frames, ie, long beacons. As shown in FIG. 6, after transmitting the second broadcast frame 61 carrying the service information group of the catering class, five first broadcast frames 60 carrying the service directory are continuously transmitted, and then the second broadcast carrying the service information group of the entertainment class is transmitted. After the frame 62, five first broadcast frames 60 carrying the service directory are continuously transmitted, and finally, after the second broadcast frame 63 carrying the service information group of the traffic class is transmitted, five first broadcasts carrying the service directory are continuously transmitted. The frame 60, so far, forms a complete broadcast period, and the broadcast period can be cyclically transmitted multiple times according to actual conditions. Wherein, regardless of the first broadcast frame or the second broadcast frame, the beacon period between every two broadcast frames is a short beacon period, but the beacon period between every two second broadcast frames is a long beacon period.

Therefore, the service discovery method provided by the embodiment of the present invention, the access point classifies the service information according to different service information groups according to the summary information of each service information, determines the broadcast time of each service information group, and The summary information of each service information and the broadcast time of each service information group constitute a service directory, add the service directory to the first broadcast frame, and add the broadcast time of the service directory and the service information group to different second In the broadcast frame, the service information groups carried by the second broadcast frames are different, and the first broadcast frame and the second broadcast frame are sent to the station, when the station receives the first broadcast frame or the second broadcast frame sent by the access point. Implementing the AP to classify all service information, adding the service directory to the first broadcast frame, and adding the broadcast time and service information group of the service directory to different second broadcast frames, and sending the first to the site Broadcasting frame and second broadcast frame, so that the station receives the required service letter according to the first broadcast frame and the second broadcast frame at the learned time Without the need to receive all of the service information, the STA reduce power consumption, large amount of data to support passive service discovery.

FIG. 7 is a flowchart of a service discovery method according to Embodiment 7 of the present invention. Provided by this embodiment The service discovery method performed by the site side corresponds to the service discovery method performed by the access point side provided in the fourth embodiment. As shown in the figure, the embodiment of the present invention specifically includes the following steps:

Step 71 0: The station receives the broadcast frame that carries the service directory and the service information group sent by the access point, where the service directory includes the information identifier of the service information and the broadcast time of the service information group, and the received broadcast frame includes the first broadcast frame. And a second broadcast frame.

Specifically, the station receives the first broadcast frame that carries the service directory or the second broadcast frame that carries the broadcast time of the service directory and the service information group, where the service information group carried by each second broadcast frame is received by the access point. Not the same.

Step 720: The station finds the service information required by the service information group of the broadcast frame, or the broadcast time of the service directory, or learns the service information group of the service information required by the self from the service directory of the broadcast frame. Broadcast time. The received broadcast frame includes a first broadcast frame and a second broadcast frame. The first broadcast frame carries a service directory, and the second broadcast frame carries a type of service information group and a broadcast time of the service directory.

Specifically, after the station receives the broadcast frame sent by the access point, the first broadcast frame or the second broadcast frame is processed in two different manners by using two different processing manners. The processing of each processing manner is as follows:

(1) The STA obtains detailed service information including the service it wants, that is, the service information group required by itself stops scanning. In this manner, the STA can enter the sleep state at the time when it does not need to receive. The specific process is:

When the first broadcast frame is received, the broadcast time of the service information group in which the service information required by the service information is required is obtained from the service directory carried in the first broadcast frame, and then enters a sleep state, and only the service information required by itself is obtained. The broadcast time of the service information group in which it is located enters the receiving state, thereby discovering the service information required by itself from the received broadcast frame.

When the second broadcast frame is received, and the service information group carried by the second broadcast frame includes the service information required by the second broadcast frame, the station stops receiving other broadcast frames sent by the access point;

When the second broadcast frame is received, and the service information group carried by the second broadcast frame does not include the self When the required service information is obtained, the broadcast time of the service directory is obtained according to the second broadcast frame, and the sleep state is entered, and only the broadcast time of the service directory enters the receiving state, and the received first broadcast carrying the service directory is received. After the broadcast time of the service information group in which the service information required by the user is located, the frame enters the sleep state, and enters the reception state only at the broadcast time of the service information group where the service information required by itself is received, thereby receiving from the received The service information required by itself is found in the second broadcast frame carrying the service information group.

When the first broadcast frame carrying the service directory is received, and the information identifier of the service information corresponding to the service information required by itself and the broadcast time of the service information group are present in the service directory, the broadcast of the service information group is performed. Receiving a second broadcast frame, and discovering the service information required by itself from the received second broadcast frame, and discarding other broadcast frames of the access point, for example, the first broadcast frame or the second broadcast frame. deal with;

When the first broadcast frame carrying the service directory is received, and the information identifier of the service information corresponding to the service information required by itself and the broadcast time of the service information group are not present in the service directory, the station no longer receives the connection. The service information sent by the ingress is discarded for other broadcast frames of the access point, for example, the first broadcast frame or the second broadcast frame.

When the second broadcast frame is received, and the service information group carried by the second broadcast frame includes the service information required by itself, the site no longer receives other service information, and for other broadcast frames of the access point, For example, the first broadcast frame or the second broadcast frame is discarded.

When the second broadcast frame is received, and the service information group carried by the second broadcast frame does not include the service information required by itself, the broadcast time of the service directory is learned according to the second broadcast frame, and the site is used in the service directory. The broadcast time receives the first broadcast frame.

In addition, when the first broadcast frame is a beacon and the second broadcast frame is also a beacon, but the first broadcast frame occupies less than the number of bytes occupied by the second broadcast frame, the station pairs the first broadcast frame. Or second The processing procedure of the broadcast frame is the same as the above, and will not be described again here.

Therefore, the service discovery method provided by the embodiment of the present invention, the station receives a broadcast frame that carries the service directory and the service information group sent by the access point, where the service directory includes the information identifier of the service information and the broadcast time of the service information group, and is received. The broadcast frame includes a first broadcast frame and a second broadcast frame, and according to the service directory and the service information group carried by the received broadcast frame, discovers service information required by itself, and implements the site according to the first broadcast frame and the second broadcast frame. Receiving the required service information at the time of knowledge, without receiving all the service information, reducing the power consumption of the STA, and supporting the passive service discovery of a large amount of data.

FIG. 8 is a schematic diagram of an access point according to Embodiment 8 of the present invention. The access point is used to perform the service discovery method provided by Embodiments 1 through 7 of the present invention. As shown in the figure, the embodiment of the present invention specifically includes: a classification unit 81, a processing unit 82, an adding unit 83, and a sending unit 84.

The classification unit 81 classifies the content of each service information into different service information groups, and each service information group has a message identifying the summary information of each service information, and the service information in each service information group. The content belongs to the service type corresponding to the information identification, and the service information group is transmitted to the processing unit 82; the processing unit 82 is configured to receive the service information group from the classification unit 81, determine the broadcast time of each service information group, and according to the service information The broadcast time and information identification of the group establishes a service directory, which includes the broadcast time and information identifier of all service information groups, and transmits the service information group and the service directory to the adding unit 8 3 ; the adding unit 8 3 is used for the slave processing unit 82, receiving the service information group and the service directory, adding the service information group and the service directory to the broadcast frame, and transmitting the broadcast frame to the transmitting unit 84; the transmitting unit 84 is configured to receive the broadcast frame from the adding unit 83, and determine the broadcast frame. Broadcast period, and periodically send broadcast frames to the station according to the broadcast period, And a broadcast time of the service information group in which the station finds the service information required by the station from the service information group of the broadcast frame or the service directory of the broadcast frame from the service directory of the broadcast frame.

In an embodiment, the service directory further includes summary information of service information in each service information group, and the adding unit 83 is configured to separately add the service information group to each broadcast frame, and The recordings are added to the respective broadcast frames, so that the service information groups carried by the broadcast frames are different, and the service directories carried by the broadcast frames are the same. Each broadcast frame carries a service directory and a type of service information group. .

In another embodiment, the service catalog also includes summary information of the service information in each service information group, and the processing unit 82 is further configured to determine the broadcast time of the service catalog. The broadcast frame involved in this embodiment includes: a first broadcast frame and a second broadcast frame. The adding unit 83 is configured to add the service directory to the first broadcast frame, and add the broadcast time and the service information group of the service directory to different second broadcast frames, so that the service information groups carried by the respective second broadcast frames are not the same. The sending unit 84 is configured to send a first broadcast frame to the station, where the station learns, from the first broadcast frame, a broadcast time for the access point to send the service information required by the access point, and sends a second broadcast frame to the station for the site to be the second The service information required by itself is found in the broadcast frame.

In the broadcast period of the sending unit 84, the first broadcast frame is sent only once, and the second broadcast frames carrying different service information groups are respectively sent once; or the first broadcast frame is sent multiple times, each carrying different service information groups. The second broadcast frame is sent once, and one or more first broadcast frames are sent before each second broadcast frame is sent, where the number of bytes occupied by the first broadcast frame is smaller than that occupied by the second broadcast frame. The number of bytes. Therefore, the access point has multiple forms of transmitting the first broadcast frame and the second broadcast frame, for example, after sending the first broadcast frame, and then sending the second broadcast frame until all the second broadcast frames are sent to a broadcast period. And then executing the next broadcast period; or transmitting the second broadcast frame in turn, and transmitting one or more first broadcast frames between the respective second broadcast frames until all the second broadcast frames are sent to be a broadcast period, and then Execute the next broadcast cycle.

Therefore, the access point provided by the embodiment of the present invention classifies the service information according to different service information groups according to the summary information of each service information, determines the broadcast time of each service information group, and determines each service. The summary information of the information and the broadcast time of each service information group constitute a service directory, the service information group and the service directory are added to the broadcast frame, and the broadcast frame is sent to the station, so that all the APs are used. After the service information is classified, it is sent to the STA, and the STA receives the required service information at the time of being informed, and does not need to receive all the service information, thereby reducing the STA's Power consumption, capable of supporting passive data discovery with large amounts of data.

FIG. 9 is a schematic diagram of a station provided in Embodiment 9 of the present invention. The site is for performing the service discovery method provided by Embodiments 1 through 7 of the present invention. As shown in the figure, the embodiment of the present invention specifically includes: a receiving unit 91 and a discovery unit 92.

The receiving unit 91 is configured to receive a broadcast frame that carries the service directory and the service information group sent by the access point, where the service directory includes the information identifier of the service information and the broadcast time of the service information group, and transmits the broadcast frame to the discovery unit 92; 92 is configured to receive a broadcast frame from the receiving unit, discover the service information required by itself from the service information group of the broadcast frame, or learn the broadcast time of the service information group in which the service information required by itself is obtained from the service directory of the broadcast frame.

When there are both a service directory and a service information group in the broadcast frame, in one embodiment, the discovery unit 92 is configured to stop receiving the service information when the service information group of the received broadcast frame includes the service information required by itself. Other broadcast frames sent by the access point; when the service information group of the received broadcast frame does not contain the service information required by itself, the site learns from the service directory the service information group in which the service information required by itself is located. After the broadcast time, the user enters the dormant state and enters the receiving state only during the broadcast time of the service information group in which the service information required by itself is received, thereby discovering the service information required by itself from the received broadcast frame.

In another embodiment, the discovery unit 92 is configured to: when the service information group of the received broadcast frame includes service information required by itself, the site no longer receives other service information sent by the access point, for accessing The other broadcast frames sent by the point are discarded; when the service information group of the received broadcast frame does not contain the service information required by itself, and the service directory has the information of the service information corresponding to the service information required by itself. The broadcast time of the identification and service information group is received at the broadcast time of the service information group, and the service information required by itself is found from the received broadcast frame, and the other broadcast frames sent by the access point are discarded. deal with. In addition, the discovery unit 92 is further configured to: when the service information group of the received broadcast frame does not include the service information required by itself, and the service directory does not have the information identifier of the service information corresponding to the service information required by itself. The broadcast time of the service information group, the station no longer receives the service information sent by the access point, and other broadcast frames sent by the access point Dispose of.

When the broadcast frame includes the first broadcast frame and the second broadcast frame, the receiving unit 91 is configured to receive, by the access point, the first broadcast frame that carries the service directory or the second broadcast that carries the broadcast time and the service information group of the service directory. a frame, where each of the second broadcast frames carries different service information groups.

In an embodiment, the discovery unit 92 is configured to: after receiving the first broadcast frame, learn from the service directory carried by the first broadcast frame, after the broadcast time of the service information group in which the service information required by the user is located, enter The dormant state enters the receiving state only at the broadcast time of the service information group in which the service information required by itself, so that the service information required by itself is found from the received broadcast frame; when the second broadcast frame is received, and When the service information group carried by the second broadcast frame contains the service information required by itself, the station stops receiving other broadcast frames. In addition, the discovery unit 92 is further configured to: when the second broadcast frame is received, and the service information group carried by the second broadcast frame does not include the service information required by itself, the broadcast of the service directory is obtained according to the second broadcast frame. After the time, the user enters the dormant state, enters the receiving state only during the broadcast time of the service directory, and after obtaining the broadcast time of the service information group in which the service information required by the service information group is received from the received first broadcast frame carrying the service directory, Then, it enters the dormant state, and enters the receiving state only in the broadcast time of the service information group in which the service information required by itself is received, thereby discovering the service information required by itself from the received second broadcast frame carrying the service information group.

In another embodiment, the discovery unit 92 is configured to: when receiving the first broadcast frame carrying the service directory, and the service directory has the information identifier and service information of the service information corresponding to the service information required by itself. The broadcast time of the group receives the second broadcast frame at the broadcast time of the service information group, and discovers the service information required by itself from the received second broadcast frame, for other first broadcast frames sent by the access point. Or the second broadcast frame is discarded; when the first broadcast frame carrying the service directory is received, and the service identifier does not have the service identifier and the service information group corresponding to the service information required by the service directory. The broadcast time, the station no longer receives the service information sent by the access point, and the first broadcast frame or the second broadcast frame is discarded for other broadcast frames sent by the access point. In addition, the discovery unit 92 is configured to receive the second broadcast frame and the second broadcast frame. When the carried service information group contains the service information required by itself, the site does not receive other service information, and the other broadcast frames sent by the access point, for example, the second broadcast frame or the first broadcast frame are lost. Discarding the processing; when the second broadcast frame is received, and the service information group carried by the second broadcast frame does not include the service information required by itself, the broadcast time of the service directory is learned according to the second broadcast frame, and is used for the site. The first broadcast frame is received at the broadcast time of the service catalog.

Therefore, the station provided by the embodiment of the present invention, after receiving the broadcast frame carrying the service directory and the service information group sent by the access point, discovers the service information required by the service information group of the broadcast frame or the broadcast frame from the broadcast frame. The broadcast time of the service information group in which the service information required by the service information is obtained in the service directory is implemented, and all the service information is classified and sent to the STA by using the AP, and the STA receives the required service information at the time of obtaining, without receiving all the information. The service information reduces the power consumption of the STA and can support the passive service discovery of large data volume.

FIG. 10 is a schematic diagram of an access point according to Embodiment 10 of the present invention. The access point is used to perform the passive service discovery method provided by Embodiments 1 to 7 of the present invention. As shown in the figure, the embodiment of the present invention specifically includes: as shown, the access point 100 includes: a transmitting circuit 102, a receiving circuit 103, a power controller 104, a decoding processor 105, a processing unit 106, a memory 107, and an antenna. 101. Processing unit 106 controls the operation of access point 100, which may also be referred to as a CPU. Memory 107 can include read only memory and random access memory and provides instructions and data to processing unit 106. A portion of the memory 107 may also include non-volatile line random access memory (NVRAM). In a particular application, the access point 100 can be embedded or can itself be a wireless communication device such as a mobile telephone, and can also include a carrier that houses the transmitting circuitry 102 and the receiving circuitry 103 to allow access between the access point 100 and the remote location. Data transmission and reception. Transmitting circuit 102 and receiving circuit 103 may be coupled to antenna 101. The various components of the access point 100 are coupled together by a bus system 1000, wherein the bus system 1 000 includes a power bus, a control bus, and a status signal bus in addition to the data bus. However, for the sake of clarity, various buses are labeled as the bus system 1000 in the figure. The access point 100 can also include a processing unit 106 for processing signals, and further includes a power controller 104, a decoding processor 105. The decoder 105 may be associated with the processing unit 106 in a specific different product. Integration into one. Figure. The general purpose processor may be a microprocessor or the processor or any conventional processor, decoder or the like. The steps of the method disclosed in the embodiments of the present invention may be directly implemented as hardware processor execution completion, or performed by a combination of hardware and software modules in the decoding processor. The software modules can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in the memory 107, and the decoding unit or the processing unit reads the information in the memory 107, and combines the hardware to complete the steps of the passive service discovery method provided by the first to seventh embodiments of the present invention.

FIG. 11 is a schematic diagram of a station according to Embodiment 11 of the present invention. The site is used to perform the passive service discovery method provided by Embodiments 1 to 7 of the present invention. As shown, the site 110 includes: a transmitting circuit 112, a receiving circuit 113, a power controller 114, a decoding processor 115, a processing unit 116, a memory 117, and an antenna 111. Processing unit 116 controls the operation of site 110, which may also be referred to as a CPU. Memory 117 can include read only memory and random access memory and provides instructions and data to processing unit 116. A portion of the memory 117 may also include non-volatile line random access memory (NVRAM). In a specific application, the site 110 may embed or itself be a wireless communication device such as a mobile phone, and may also include a carrier that houses the transmitting circuit 112 and the receiving circuit 113 to allow data transmission between the station 110 and the remote location. receive. Transmitting circuit 112 and receiving circuit 113 may be coupled to antenna 111. The various components of the site 110 are coupled together by a bus system 1100, which in addition to the data bus includes a power bus, a control bus, and a status signal bus. However, for the sake of clarity, various buses are labeled as bus system 1100 in the figure. The site 110 may also include a processing unit 116 for processing signals, and further includes a power controller 114, a decoding processor 115. The decoder 115 may be integrated with the processing unit 116 in a particular different product. Figure. The general purpose processor may be a microprocessor or the processor or any conventional processor. Decoder, etc. The steps of the method disclosed in the embodiments of the present invention may be directly implemented as hardware processor execution completion, or performed by a combination of hardware and software modules in the decoding processor. The software modules can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in the memory 117, and the decoding unit or the processing unit reads the information in the memory 117, and combines the hardware to complete the steps of the passive service discovery method provided by the first to seventh embodiments of the present invention. A person skilled in the art should further appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both, in order to clearly illustrate hardware and software. Interchangeability, the composition and steps of the various examples have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

The steps of a method or algorithm described in connection with the embodiments disclosed herein can be implemented in hardware, a software module executed by a processor, or a combination of both. Software modules can be placed in random access memory (RAM), memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or technical field Any other form of storage medium known.

The above described embodiments of the present invention are further described in detail, and the embodiments of the present invention are intended to be illustrative only. The scope of the protection, any modifications, equivalents, improvements, etc., made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

Claims CP12727 1. A service discovery method, characterized in that the method includes:

The access point classifies each service information according to its content to obtain different service information groups. Each service information group has an information identifier, and the content of the service information in each service information group corresponds to the information identifier. type of service;

The access point determines the broadcast time of each service information group, and establishes a service directory based on the broadcast time and information identification of the service information group, where the service directory includes the broadcast time and information identification of all service information groups;

The access point adds the service information group and the service directory to the broadcast frame; the access point determines the broadcast period of the broadcast frame, and periodically sends the broadcast frame to the station according to the broadcast period. , for the station to discover the service information it needs from the service information group of the broadcast frame or to obtain the broadcast time of the service information group in which the service information it needs is located from the service directory of the broadcast frame. .

2. The service discovery method according to claim 1, characterized in that, the service directory further includes summary information of the service information in each service information group, and the service information group and the service Directories are added to the broadcast frame, including:

The service information group is added to each broadcast frame respectively, and the service directory is added to each broadcast frame respectively, so that the service information groups carried by each broadcast frame are different, and each broadcast frame The service directories carried are all the same, wherein each broadcast frame carries a service directory and a type of service information group.

3. The service discovery method according to claim 1, wherein the service directory further includes summary information of the service information in each service information group and determines the broadcast time of each service information group. , and establish a service directory based on the broadcast time and information identification of the service information group, and also includes: The broadcast time of the service directory is determined according to the broadcast time of each service information group.

4. The service discovery method according to claim 3, wherein the broadcast frame includes: a first broadcast frame and a second broadcast frame; and adding the service information group and the service directory to the broadcast frame. , including:

Add the service directory to the first broadcast frame, and add the broadcast time of the service directory and the service information group to different second broadcast frames, so that the service information groups carried by each second broadcast frame are all Are not the same.

5. The service discovery method according to claim 4, characterized in that: periodically sending the broadcast frame to the station according to the broadcast cycle includes:

The first broadcast frame and the second broadcast frame are periodically sent to the station according to the broadcast cycle, so that the station can learn from the service directory of the first broadcast frame where the service information it needs is located. broadcast time of the service information group, and discover the service information required by itself and the broadcast time of the service directory from the service information group of the second broadcast frame.

6. The service discovery method according to claim 5, wherein periodically sending the first broadcast frame and the second broadcast frame to the station according to the broadcast cycle includes:

During the broadcast period, the first broadcast frame is sent only once, and the second broadcast frames carrying different service information groups are sent once respectively.

7. The service discovery method according to claim 5, characterized in that, periodically sending the first broadcast frame and the second broadcast frame to the station according to the broadcast cycle, including:

During the broadcast period, the first broadcast frame is sent multiple times, each of the second broadcast frames carrying different service information groups is sent once, and one and more broadcast frames are sent before or after each second broadcast frame is sent. a first broadcast frame, wherein the number of bytes occupied by the first broadcast frame is less than the number of bytes occupied by the second broadcast frame.

8. A service discovery method, characterized in that the method includes:

The station receives a broadcast frame carrying a service directory and a service information group sent by the access point, where the service directory includes an information identifier of the service information and a broadcast time of the service information group; The station discovers the service information it needs from the service information group of the broadcast frame or obtains the broadcast time of the service information group in which the service information it needs is located from the service directory of the broadcast frame.

9. The service discovery method according to claim 8, characterized in that: the service information required by itself is discovered from the service information group of the broadcast frame or the service directory of the broadcast frame is obtained. The broadcast time of the service information group where the required service information is located, including:

When the service information group of the received broadcast frame contains the service information required by itself, the station stops receiving other broadcast frames sent by the access point;

When the service information group of the received broadcast frame does not contain the service information required by itself, the station obtains the service information where the service information required by itself is located from the service directory. After the broadcast time of the group, it enters the sleep state, enters the receiving state during the broadcast time of the service information group where the service information it needs is located, and discovers the service information it needs from the received broadcast frame.

10. The service discovery method according to claim 8, characterized in that: the service information required by itself is discovered from the service information group of the broadcast frame or the service information is obtained from the service directory of the broadcast frame. The broadcast time of the service information group where the service information required by itself is located, including:

When the service information group of the received broadcast frame contains the service information required by itself, the station will no longer receive other service information sent by the access point. For the access Other broadcast frames sent by the point are discarded;

When the service information group of the received broadcast frame does not contain the service information required by the self, and the service information corresponding to the service information required by the self exists in the service directory information identifier and the broadcast time of the service information group, then receive the broadcast frame at the broadcast time of the service information group, and discover the service information required by itself from the received broadcast frame, for the access point Other broadcast frames sent are discarded;

When the service information group of the received broadcast frame does not contain the service information required by itself, and the service corresponding to the service information required by itself does not exist in the service directory, If the information identifier of the service information and the broadcast time of the service information group are determined, the station will no longer receive the service information sent by the access point, and will discard other broadcast frames sent by the access point.

11. The service discovery method according to claim 8, wherein the broadcast frame includes a first broadcast frame and a second broadcast frame, and the station receives a broadcast carrying a service information group and a service directory sent by an access point. frames, including:

Receive a first broadcast frame carrying a service directory sent by the access point, and receive a second broadcast frame carrying the broadcast time of the service directory and the service information group, wherein each second broadcast frame carries The service information groups are all different.

12. The service discovery method according to claim 11, characterized in that: the service information required by itself is discovered from the service information group of the broadcast frame or the service directory of the broadcast frame is obtained. The broadcast time of the service information group in which the required service information is located includes: When the first broadcast frame is received, the required service information is obtained from the service directory carried by the first broadcast frame. After the broadcast time of the service information group where the service information is located, it enters the dormant state, enters the receiving state during the broadcast time of the service information group where the service information it needs is located, and discovers the service it needs from the received broadcast frame. information;

When the second broadcast frame is received, and the service information group carried by the second broadcast frame contains the service information required by itself, the station stops receiving the information sent by the access point. other broadcast frames.

13. The service discovery method according to claim 11 or 12, characterized in that: discovering the service information required by itself from the service information group of the broadcast frame or obtaining it from the service directory of the broadcast frame The broadcast time of the service information group in which the service information required by itself is located includes: When the second broadcast frame is received, and the service information group carried by the second broadcast frame does not include the When receiving the service information required by itself, after learning the broadcast time of the service directory according to the second broadcast frame, it enters the sleep state, and enters the receiving state at the broadcast time of the service directory;

Obtain the required information from the received first broadcast frame carrying the service directory. after the broadcast time of the service information group where the service information is located, and then enters the sleep state, and enters the receiving state during the broadcast time of the service information group where the service information required by itself is located, from the received service information carrying the service information The service information required by itself is found in the second broadcast frame of the group.

14. The service discovery method according to claim 11, characterized in that: the service information required by itself is discovered from the service information group of the broadcast frame or the service directory of the broadcast frame is obtained. The broadcast time of the service information group in which the required service information is located includes: when the first broadcast frame carrying the service directory is received, and the service required by the self exists in the service directory If the information corresponds to the information identifier of the service information and the broadcast time of the service information group, then the second broadcast frame is received at the broadcast time of the service information group, and is found from the received second broadcast frame. The service information required by itself is discarded for other first broadcast frames or second broadcast frames sent by the access point;

When the first broadcast frame carrying the service directory is received, and the information identifier and service information group of the service information corresponding to the service information required by the self do not exist in the service directory broadcast time, the station no longer receives the service information sent by the access point, and discards other first broadcast frames or second broadcast frames sent by the access point.

15. The service discovery method according to claim 11 or 14, characterized in that: the service information required by itself is discovered from the service information group of the broadcast frame or the service information is obtained from the service directory of the broadcast frame. The broadcast time of the service information group in which the service information required by itself is located includes: when the second broadcast frame is received, and the service information group carried by the second broadcast frame contains the service information group required by itself. When the required service information is required, the station no longer receives the service information sent by the access point, and discards other second broadcast frames or first broadcast frames sent by the access point;

When the second broadcast frame is received, and the service information group carried by the second broadcast frame does not contain the service information required by itself, then the second broadcast frame is learned according to the second broadcast frame. The broadcast time of the service catalog is used for the station to receive the first broadcast time of the service catalog. broadcast frame.

16. An access point, characterized in that, the access point includes:

Classification unit, used to classify each service information according to its content to obtain different service information groups. Each service information group has a message identifying the summary information of each service information. The service information in each service information group The content belongs to the service type corresponding to the information identifier, and the service information group is transmitted to the processing unit;

A processing unit, configured to receive the service information group from the classification unit, determine the broadcast time of each service information group, and establish a service directory according to the broadcast time and information identification of the service information group, the service directory Including the broadcast time and information identification of all service information groups, and transmitting the service information group and the service directory to the adding unit;

An adding unit, configured to receive the service information group and the service directory from the processing unit, add the service information group and the service directory to a broadcast frame, and transmit the broadcast frame to a sending unit;

A sending unit, configured to receive the broadcast frame from the adding unit, determine the broadcast period of the broadcast frame, and periodically send the broadcast frame to the station according to the broadcast period, so that the station can receive services from the broadcast frame. Discover the service information required by itself in the information group or obtain the broadcast time of the service information group in which the service information required by itself is located from the service directory of the broadcast frame.

17. The access point according to claim 17, wherein the service directory further includes summary information of the service information in each service information group, and the adding unit is configured to add the service information group to are added to each broadcast frame respectively, and the service directory is added to each broadcast frame respectively, so that the service information groups carried by each broadcast frame are different, and the service directory carried by each broadcast frame They are all the same, where each broadcast frame carries a service directory and a type of service information group.

18. The access point according to claim 17, characterized in that: the service directory further includes summary information of service information in each service information group, and the processing unit is further configured to: The broadcast time of the service information group determines the broadcast time of the service catalog.

19. The access point according to claim 19, wherein the broadcast frame includes: a first broadcast frame and a second broadcast frame; the adding unit is configured to add the service directory to the first broadcast frame. , and add the broadcast time of the service directory and the service information group to different second broadcast frames, so that the service information groups carried by each second broadcast frame are different.

20. The access point according to claim 20, characterized in that, the sending unit is configured to periodically send the first broadcast frame and the second broadcast frame to the station according to the broadcast cycle, for the The station learns the broadcast time of the service information group in which the service information it needs is located from the service directory of the first broadcast frame, and discovers the service information it needs from the service information group of the second broadcast frame. and the broadcast time of said service catalog.

21. The access point according to claim 21, wherein the sending unit is further configured to send the first broadcast frame only once within the broadcast period, each of which carries a different service information group. The second broadcast frame is sent once.

22. The access point according to claim 21, wherein the sending unit is further configured to send the first broadcast frame multiple times within the broadcast period, each of which carries a different service information group. The second broadcast frames are sent once respectively, and one or more first broadcast frames are sent before or after each second broadcast frame is sent, wherein the number of bytes occupied by the first broadcast frame is smaller than that of the second broadcast frame. Number of bytes occupied.

23. A site, characterized in that, the site includes:

A receiving unit configured to receive a broadcast frame carrying a service directory and a service information group sent by the access point, where the service directory includes an information identifier of the service information and a broadcast time of the service information group, and transmit the broadcast frame to the discovery unit. ;

A discovery unit, configured to receive the broadcast frame from the receiving unit, discover the service information it needs from the service information group of the broadcast frame, or obtain the service information it needs from the service directory of the broadcast frame. The broadcast time of the service information group in which the service information resides.

24. The site according to claim 23, characterized in that the discovery unit is used for current When the service information group of the received broadcast frame contains the service information required by itself, the station stops receiving other broadcast frames sent by the access point; when the received broadcast frame When the service information group of the frame does not contain the service information required by itself, then the station obtains the broadcast time of the service information group in which the service information required by itself is located from the service directory, and then enters In the dormant state, it enters the receiving state during the broadcast time of the service information group in which the service information it needs is located, and discovers the service information it needs from the received broadcast frame.

25. The station according to claim 23, characterized in that, the discovery unit is configured to: when the service information group of the received broadcast frame contains the service information required by itself, then the The station no longer receives other service information sent by the access point, and discards other broadcast frames sent by the access point; when the service information group of the received broadcast frame does not contain all Describe the service information required by itself, and there is an information identifier of the service information corresponding to the service information required by itself and the broadcast time of the service information group in the service directory, then in the service information group Receive the broadcast frame during the broadcast time, discover the service information required by itself from the received broadcast frame, and discard other broadcast frames sent by the access point; when the broadcast frame is received The service information group does not contain the service information required by the self, and the information identification of the service information and the service information group corresponding to the service information required by the self do not exist in the service directory. broadcast time, the station no longer receives the service information sent by the access point, and discards other broadcast frames sent by the access point.

26. The station according to claim 23, characterized in that: the broadcast frame includes a first broadcast frame and a second broadcast frame, and the receiving unit is configured to receive a third broadcast frame carrying a service directory sent by the access point. A broadcast frame, and receiving a second broadcast frame carrying the broadcast time of the service directory and the service information group, wherein the service information groups carried by each second broadcast frame are different.

27. The site according to claim 26, wherein the discovery unit is configured to, when receiving the first broadcast frame, learn the self-service directory from the service directory carried by the first broadcast frame. After the broadcast time of the service information group where the required service information is located, it enters the sleep state, and enters the receiving state during the broadcast time of the service information group where the required service information is located. The service information required by itself is found in the received broadcast frame; when the second broadcast frame is received, and the service information group carried by the second broadcast frame contains the service information required by itself. service information, the station stops receiving other broadcast frames sent by the access point.

28. The site according to claim 26 or 27, characterized in that: the discovery unit is further configured to receive the second broadcast frame and the service information group carried by the second broadcast frame. When the service information required by itself is not included, then after learning the broadcast time of the service catalog according to the second broadcast frame, it enters the sleep state, and enters the receiving state at the broadcast time of the service catalog; from receiving After learning the broadcast time of the service information group where the service information required by itself is located in the first broadcast frame carrying the service directory, and then enters the sleep state, where the service information required by itself is located Enter the receiving state at the broadcast time of the service information group, and discover the service information required by itself from the received second broadcast frame carrying the service information group.

29. The site according to claim 26, wherein the discovery unit is configured to receive the first broadcast frame carrying the service directory, and the service directory contains the The information identifier of the service information corresponding to the service information required by itself and the broadcast time of the service information group, then the second broadcast frame is received at the broadcast time of the service information group, and the second broadcast frame is received from the received third The service information required by itself is found in the second broadcast frame, and other first broadcast frames or second broadcast frames sent by the access point are discarded. When receiving all the first broadcast frames or second broadcast frames that carry the service directory, the first broadcast frame, and the information identifier of the service information and the broadcast time of the service information group corresponding to the service information required by the station do not exist in the service directory, then the station will no longer receive the The service information sent by the access point is discarded for other first broadcast frames or second broadcast frames sent by the access point.

30. The site according to claim 26 or 29, characterized in that: the discovery unit is used to: when the second broadcast frame is received, and the service information group carried by the second broadcast frame When the station contains the service information it needs, the station will no longer receive other service information, and will discard other second broadcast frames or first broadcast frames sent by the access point; when receiving is the second broadcast frame, and the service information group carried by the second broadcast frame does not contain the service information required by itself, then the service directory is obtained according to the second broadcast frame. The broadcast time is used for the station to receive the first broadcast frame at the broadcast time of the service directory.