CN107113806B

CN107113806B - Random access method, station and access point

Info

Publication number: CN107113806B
Application number: CN201580071343.XA
Authority: CN
Inventors: 林英沛; 罗俊; 马驰翔
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2015-02-16
Filing date: 2015-02-16
Publication date: 2020-10-27
Anticipated expiration: 2035-02-16
Also published as: CN107113806A; WO2016131182A1

Abstract

The embodiment of the invention provides a random access method, a site and an access point, relates to the technical field of communication, and is used for reducing the interaction flow of a random access process, reducing the signaling transmission overhead and reducing the time delay. The random access method comprises the following steps: a station acquires random access resources (101) distributed by an access point; sending a random access request to an access point on random access resources, wherein the random access request comprises a type field of data to be sent by a station, and the type of the data to be sent comprises a data packet with a fixed data packet length and a data packet with an unfixed data packet length (102); receiving resource allocation information sent by an access point, wherein the resource allocation information comprises a transmission resource identifier allocated to a station by the access point, and the transmission resource identifier corresponds to a type field in a random access request (103); data to be transmitted is transmitted on the transmission resources of the resource allocation information (104).

Description

Random access method, station and access point

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a random access method, a station, and an access point.

Background

A Wireless Local Area Network (WLAN) is a network system that uses radio frequency technology to transmit over the air. As the number of communication devices increases, the frequency spectrum used for signal transmission over the air interface becomes more and more crowded, and improving the transmission efficiency of the air interface becomes one of the key problems faced by wireless communication.

In order to solve the above problem, Device to Device (or terminal to terminal) (hereinafter, Device to Device, abbreviated as D2D) technology has been developed. The D2D technology is used to realize direct communication between two communication devices in a Wireless network without transferring via a base station or an Access Point (AP) as in cellular or Wireless Fidelity (WiFi). Because the D2D technology saves one-time air interface transmission, the frequency spectrum utilization rate of the wireless network can be improved, and the transmission capacity of the air interface is improved.

The D2D discovery technology is one of the key points in the D2D technology, and when D2D is discovered between user equipments, since a D2D link is not established yet, the D2D link needs to be established by the AP in a conventional link manner. Fig. 1 shows a contention-based uplink random Access method under Orthogonal Frequency Division Multiple Access (OFDMA) to implement D2D discovery. Fig. 1 shows an OFDMA Frame structure, which includes a Legacy Preamble, an 11ax signaling Field (11 ax Signal Field), a Downlink subframe (Downlink subframe), and an Uplink subframe (Uplink subframe), where the 11ax signaling Field includes a Frame Control region (Frame Control) and a signaling Field (Signal Field, SIG), and the signaling Field is used to indicate Downlink and Uplink resource allocation information, such as may be indicated by a Media Access Protocol (MAP).

Specifically, a resource location for performing uplink random access in the next uplink interval is given in a random access configuration information field of a frame control region in the OFDMA frame structure. Then, a Station (STA) with uplink requirement in the time frequency resource randomly selects a random access sequence in a random access sequence set to send an uplink access request for declaring that uplink information needs to be transmitted to the AP; if the AP correctly receives the random access sequence, the corresponding resource is allocated in the next uplink resource indication for the uplink bandwidth request. And the STA transmits specific resource request information in the indicated uplink resource for scheduling of the AP in the next uplink time slot, after receiving the resource request information, the AP schedules the STA according to a scheduling rule and indicates the scheduling information in the MAP in the next OFDMA frame, and after receiving the scheduling information, the STA performs uplink transmission at the position indicated by the AP.

However, when D2D discovery is performed by using the above method, the interaction flow between the station and the AP is too many, so that the signaling overhead for transmitting discovery information is too large, and the delay is long.

Disclosure of Invention

The embodiment of the invention provides a random access method, a site and an access point, which are used for reducing the interaction flow in the random access process, reducing the signaling transmission overhead and reducing the time delay.

In a first aspect, an embodiment of the present invention provides a random access method, including:

a station acquires random access resources distributed by an access point;

sending a random access request to the access point on the random access resource, wherein the random access request comprises a type field of data to be sent by the station, and the type of the data to be sent comprises a data packet with a fixed data packet length and a data packet with an unfixed data packet length;

receiving resource allocation information sent by the access point, wherein the resource allocation information comprises a transmission resource identifier allocated to the station by the access point, and the transmission resource identifier corresponds to a type field in the random access request;

and sending the data to be sent on the transmission resources of the resource allocation information.

In a first possible implementation manner of the first aspect, the packet with a fixed packet length includes: a terminal-to-terminal D2D discovery request frame, a D2D discovery response frame, a D2D link establishment request frame, a D2D link establishment response frame;

the data packet with the unfixed data packet length comprises the following data packets: D2D resource request frame, D2D data frame.

In the first aspect or the first possible implementation manner of the first aspect, there is further provided a second possible implementation manner of the first aspect, where if the station is a first D2D station, the sending the data to be sent on the transmission resource of the resource allocation information specifically includes: the first D2D station transmits a D2D discovery request frame on the transmission resources of the resource allocation information.

In a second possible implementation manner of the first aspect, there is further provided a third possible implementation manner of the first aspect, where after the first D2D station sends a D2D discovery request frame on a transmission resource of the resource allocation information, the method further includes:

the first D2D station listens to first resource allocation information sent by the access point, wherein the first resource allocation information includes a transmission resource identifier allocated by the access point to a second D2D station, and the transmission resource is used for the second D2D station to transmit a D2D discovery response frame;

listening for a D2D discovery response frame transmitted by the second D2D station on the transmission resources of the first resource allocation information.

In the first aspect or the first possible implementation manner of the first aspect, there is further provided a fourth possible implementation manner of the first aspect, where if the station is a first D2D station, the sending the data to be sent on the transmission resource of the resource allocation information specifically includes: the first D2D station transmitting a D2D link establishment request frame on the transmission resources of the resource allocation information.

In a fourth possible implementation manner of the first aspect, there is further provided a fifth possible implementation manner of the first aspect, where after the first D2D station sends a D2D link establishment request frame on a transmission resource of the resource allocation information, the method further includes:

the first D2D station listens to third resource allocation information sent by the access point, where the third resource allocation information includes a transmission resource identifier allocated by the access point to a second D2D station, and the transmission resource is used for the second D2D station to transmit a D2D link establishment response frame;

and listening for a D2D link establishment response frame sent by the second D2D station on the transmission resources of the third resource allocation information.

In the first aspect or the first possible implementation manner of the first aspect, a sixth possible implementation manner of the first aspect is further provided, where before the acquiring the random access resource allocated by the access point, if the station is a second D2D station, the method further includes:

the second D2D station listens to second resource allocation information sent by the access point, where the second resource allocation information includes a transmission resource identifier allocated by the access point to the first D2D station, and the transmission resource is used for the first D2D station to transmit a D2D discovery request frame;

and listening for a D2D discovery request frame sent by the first D2D station on the transmission resources of the second resource allocation information.

In a sixth possible implementation manner of the first aspect, a seventh possible implementation manner of the first aspect is further provided, where sending the data to be sent on the transmission resources of the resource allocation information specifically includes: the second D2D station transmitting a D2D discovery response frame on the transmission resources of the resource allocation information.

In the first aspect or the first possible implementation manner of the first aspect, an eighth possible implementation manner of the first aspect is further provided, where before the acquiring the random access resource allocated by the access point, if the station is a second D2D station, the method further includes:

the second D2D station listens to fourth resource allocation information sent by the access point, where the fourth resource allocation information includes a transmission resource identifier allocated by the access point to the first D2D station, and the transmission resource is used for the first D2D station to transmit a D2D link establishment request frame;

listening for a D2D link establishment request frame transmitted by the first D2D station on a transmission resource of the fourth resource allocation information.

In an eighth possible implementation manner of the first aspect, a ninth possible implementation manner of the first aspect is further provided, where sending the data to be sent on the transmission resources of the resource allocation information specifically includes: the second D2D station transmitting a D2D link establishment response frame on the transmission resources of the resource allocation information.

In a second aspect, an embodiment of the present invention provides a random access method, including:

a site acquires random access resources distributed by an access point, wherein the random access resources comprise random access resources for random access of a data packet with a fixed data packet length and random access resources for random access of a data packet with an unfixed data packet length;

selecting a random access request to be sent on a corresponding random access resource according to the type of a data packet to be sent, wherein the type of the data packet to be sent comprises a data packet with a fixed data packet length and a data packet with an unfixed data packet length;

receiving resource allocation information sent by the access point, wherein the resource allocation information comprises a transmission resource identifier allocated by the access point to the station, and the transmission resource identifier corresponds to the selected random access resource;

In a first possible implementation manner of the second aspect, the data packet with a fixed data packet length includes: a terminal-to-terminal D2D discovery request frame, a D2D discovery response frame, a D2D link establishment request frame, a D2D link establishment response frame;

In the second aspect or the first possible implementation manner of the second aspect, there is further provided a second possible implementation manner of the second aspect, where if the station is a first D2D station, the sending the data to be sent on the transmission resource of the resource allocation information specifically includes: the first D2D station transmits a D2D discovery request frame on the transmission resources of the resource allocation information.

In a second possible implementation manner of the second aspect, there is further provided a third possible implementation manner of the second aspect, where after the first D2D station sends a D2D discovery request frame on a transmission resource of the resource allocation information, the method further includes:

In the second aspect or the first possible implementation manner of the second aspect, a fourth possible implementation manner of the second aspect is further provided, where if the station is a first D2D station, the sending the data to be sent on the transmission resource of the resource allocation information specifically includes: the first D2D station transmitting a D2D link establishment request frame on the transmission resources of the resource allocation information.

In a fourth possible implementation manner of the second aspect, there is further provided a fifth possible implementation manner of the second aspect, where after the first D2D station sends a D2D link establishment request frame on the transmission resource of the resource allocation information, the method further includes:

In the second aspect or the first possible implementation manner of the second aspect, a sixth possible implementation manner of the second aspect is further provided, where before the acquiring the random access resource allocated by the access point, if the station is a second D2D station, the method further includes:

In a sixth possible implementation manner of the second aspect, a seventh possible implementation manner of the second aspect is further provided, where sending the data to be sent on the transmission resource of the resource allocation information specifically includes: the second D2D station transmitting a D2D discovery response frame on the transmission resources of the resource allocation information.

In the second aspect or the first possible implementation manner of the second aspect, an eighth possible implementation manner of the second aspect is further provided, where before the acquiring the random access resource allocated by the access point, if the station is a second D2D station, the method further includes:

In an eighth possible implementation manner of the second aspect, a ninth possible implementation manner of the second aspect is further provided, where sending the data to be sent on the transmission resources of the resource allocation information specifically includes: the second D2D station transmitting a D2D link establishment response frame on the transmission resources of the resource allocation information.

In a third aspect, an embodiment of the present invention provides 21 a random access method, including:

the access point distributes random access resources to the stations;

receiving a random access request sent by the site on the random access resource, wherein the random access request comprises a type field of data to be sent by the site, and the type of the data to be sent comprises a data packet with a fixed data packet length and a data packet with an unfixed data packet length;

sending resource allocation information to the station, wherein the resource allocation information comprises a transmission resource identifier allocated to the station by the access point, and the transmission resource identifier corresponds to a type field in the random access request;

and receiving data to be sent by the station on the transmission resources of the resource allocation information.

In a first possible implementation manner of the third aspect, the packet with a fixed packet length includes: a terminal-to-terminal D2D discovery request frame, a D2D discovery response frame, a D2D link establishment request frame, a D2D link establishment response frame;

In a fourth aspect, an embodiment of the present invention provides a random access method, including:

the access point distributes random access resources to the station, wherein the random access resources comprise random access resources for random access of data packets with fixed data packet lengths and random access resources for random access of data packets with non-fixed data packet lengths;

receiving a random access request sent by the station on a corresponding random access resource according to the type of a data packet to be sent, wherein the type of the data packet to be sent comprises a data packet with a fixed data packet length and a data packet with a non-fixed data packet length;

sending resource allocation information to the station, wherein the resource allocation information comprises a transmission resource identifier allocated to the station by the access point, and the transmission resource identifier corresponds to the random access resource selected by the station;

In a first possible implementation manner of the fourth aspect, the packet with a fixed packet length includes: a terminal-to-terminal D2D discovery request frame, a D2D discovery response frame, a D2D link establishment request frame, a D2D link establishment response frame;

In a fifth aspect, an embodiment of the present invention provides a station, including:

an obtaining unit, configured to obtain a random access resource allocated by an access point;

a sending unit, configured to send a random access request to the access point on the random access resource, where the random access request includes a type field of data to be sent by the station, and the type of the data to be sent includes a data packet with a fixed data packet length and a data packet with an unfixed data packet length;

a receiving unit, configured to receive resource allocation information sent by the access point, where the resource allocation information includes a transmission resource identifier allocated by the access point to the station, and the transmission resource identifier corresponds to a type field in the random access request;

the sending unit is further configured to send the data to be sent on the transmission resource of the resource allocation information.

In a first possible implementation manner of the fifth aspect, the packet with a fixed packet length includes: a terminal-to-terminal D2D discovery request frame, a D2D discovery response frame, a D2D link establishment request frame, a D2D link establishment response frame;

In the fifth aspect and the first possible implementation manner of the fifth aspect, there is further provided a second possible implementation manner of the fifth aspect, where if the station is a first D2D station, the sending, by the sending unit, the sending the data to be sent on the transmission resource of the resource allocation information specifically includes: the transmitting unit transmits a D2D discovery request frame on a transmission resource of the resource allocation information.

In a second possible implementation manner of the fifth aspect, a third possible implementation manner of the fifth aspect is further provided, where the station further includes: a first listening unit;

the first listening unit is configured to listen to first resource allocation information sent by the access point after the sending unit sends a D2D discovery request frame on a transmission resource of the resource allocation information, where the first resource allocation information includes a transmission resource identifier allocated by the access point to a second D2D station, and the transmission resource is used for the second D2D station to transmit a D2D discovery response frame;

the first listening unit is further configured to listen to a D2D discovery response frame sent by the second D2D station on the transmission resource of the first resource allocation information.

In the fifth aspect and the first possible implementation manner of the fifth aspect, a fourth possible implementation manner of the fifth aspect is further provided, where if the station is a first D2D station, the sending, by the sending unit, the sending the data to be sent on the transmission resource of the resource allocation information specifically includes: the transmitting unit transmits a D2D link setup request frame on a transmission resource of the resource allocation information.

In a fourth possible implementation manner of the fifth aspect, a fifth possible implementation manner of the fifth aspect is further provided, where the station further includes: a second listening unit;

the second listening unit is configured to listen to third resource allocation information sent by the access point after the sending unit sends a D2D link establishment request frame on the transmission resource of the resource allocation information, where the third resource allocation information includes a transmission resource identifier allocated by the access point to a second D2D station, and the transmission resource is used for the second D2D station to transmit a D2D link establishment response frame;

the second listening unit is further configured to listen to a D2D link establishment response frame sent by the second D2D station on the transmission resource of the third resource allocation information.

In the fifth aspect and the first possible implementation manner of the fifth aspect, a sixth possible implementation manner of the fifth aspect is further provided, where if the station is a second D2D station, the station further includes: a third listening unit;

the third listening unit is configured to listen to second resource allocation information sent by an access point before the obtaining unit obtains a random access resource allocated by the access point, where the second resource allocation information includes a transmission resource identifier allocated by the access point to a first D2D station, and the transmission resource is used for the first D2D station to transmit a D2D discovery request frame;

the third listening unit is further configured to listen to a D2D discovery request frame sent by the first D2D station on the transmission resource of the second resource allocation information.

In a sixth possible implementation manner of the fifth aspect, a seventh possible implementation manner of the fifth aspect is further provided, where the sending, by the sending unit, sending the data to be sent on the transmission resource of the resource allocation information specifically includes: the transmitting unit transmits a D2D discovery response frame on a transmission resource of the resource allocation information.

In the fifth aspect and the first possible implementation manner of the fifth aspect, an eighth possible implementation manner of the fifth aspect is further provided, where if the station is a second D2D station, the station further includes: a fourth listening unit;

the fourth listening unit is configured to listen to fourth resource allocation information sent by an access point before the obtaining unit obtains a random access resource allocated by the access point, where the fourth resource allocation information includes a transmission resource identifier allocated by the access point to a first D2D station, and the transmission resource is used for the first D2D station to transmit a D2D link establishment request frame;

the fourth listening unit is further configured to listen to a D2D link establishment request frame sent by the first D2D station on the transmission resource of the fourth resource allocation information.

In an eighth possible implementation manner of the fifth aspect, a ninth possible implementation manner of the fifth aspect is further provided, where the sending, by the sending unit, sending the data to be sent on the transmission resource of the resource allocation information specifically includes: the transmitting unit transmits a D2D link setup response frame on the transmission resource of the resource allocation information.

In a sixth aspect, an embodiment of the present invention provides a station, including:

the access point comprises an acquisition unit and a processing unit, wherein the acquisition unit is used for acquiring random access resources distributed by the access point, and the random access resources comprise random access resources for random access of data packets with fixed data packet lengths and random access resources for random access of data packets with non-fixed data packet lengths;

a sending unit, configured to select to send a random access request on a corresponding random access resource according to a type of a to-be-sent data packet, where the type of the to-be-sent data packet includes a data packet with a fixed data packet length and a data packet with an unfixed data packet length;

a receiving unit, configured to receive resource allocation information sent by the access point, where the resource allocation information includes a transmission resource identifier allocated by the access point to the station, and the transmission resource identifier corresponds to the selected random access resource;

In a first possible implementation manner of the sixth aspect, the packet with a fixed packet length includes: a terminal-to-terminal D2D discovery request frame, a D2D discovery response frame, a D2D link establishment request frame, a D2D link establishment response frame;

In the sixth aspect and the first possible implementation manner of the sixth aspect, there is further provided a second possible implementation manner of the sixth aspect, where if the station is a first D2D station, the sending, by the sending unit, the sending the data to be sent on the transmission resource of the resource allocation information specifically includes: the transmitting unit transmits a D2D discovery request frame on a transmission resource of the resource allocation information.

In a second possible implementation manner of the sixth aspect, a third possible implementation manner of the sixth aspect is further provided, where the station further includes: a first listening unit;

In the sixth aspect and the first possible implementation manner of the sixth aspect, a fourth possible implementation manner of the sixth aspect is further provided, where if the station is a first D2D station, the sending, by the sending unit, the sending the data to be sent on the transmission resource of the resource allocation information specifically includes: the transmitting unit transmits a D2D link setup request frame on a transmission resource of the resource allocation information.

In a fourth possible implementation manner of the sixth aspect, a fifth possible implementation manner of the sixth aspect is further provided, where the station further includes: a second listening unit;

In the sixth aspect and the first possible implementation manner of the sixth aspect, there is further provided a sixth possible implementation manner of the sixth aspect, where if the station is a second D2D station, the station further includes: a third listening unit;

In a sixth possible implementation manner of the sixth aspect, a seventh possible implementation manner of the sixth aspect is further provided, where the sending, by the sending unit, sending the data to be sent on the transmission resource of the resource allocation information specifically includes: the transmitting unit transmits a D2D discovery response frame on a transmission resource of the resource allocation information.

In the sixth aspect and the first possible implementation manner of the sixth aspect, an eighth possible implementation manner of the sixth aspect is further provided, where if the station is a second D2D station, the station further includes: a fourth listening unit;

In an eighth possible implementation manner of the sixth aspect, a ninth possible implementation manner of the sixth aspect is further provided, where the sending, by the sending unit, sending the data to be sent on the transmission resource of the resource allocation information specifically includes: the transmitting unit transmits a D2D link setup response frame on the transmission resource of the resource allocation information.

In a seventh aspect, an embodiment of the present invention provides an access point, including:

the allocation unit is used for allocating random access resources to the sites by the access points;

a receiving unit, configured to receive a random access request sent by the station on the random access resource, where the random access request includes a type field of data to be sent by the station, and the type of the data to be sent includes a data packet with a fixed data packet length and a data packet with an unfixed data packet length;

a sending unit, configured to send resource allocation information to the station, where the resource allocation information includes a transmission resource identifier allocated by the access point to the station, and the transmission resource identifier corresponds to a type field in the random access request;

the receiving unit is further configured to receive data to be sent, which is sent by the station on the transmission resource of the resource allocation information.

In a first possible implementation manner of the seventh aspect, the packet with a fixed packet length includes: a terminal-to-terminal D2D discovery request frame, a D2D discovery response frame, a D2D link establishment request frame, a D2D link establishment response frame;

In an eighth aspect, an embodiment of the present invention provides an access point, including:

the allocation unit is used for allocating random access resources to the sites, wherein the random access resources comprise random access resources for random access of data packets with fixed data packet lengths and random access resources for random access of data packets with non-fixed data packet lengths;

a receiving unit, configured to receive a random access request sent by the station on a corresponding random access resource according to a type of a data packet to be sent, where the type of the data packet to be sent includes a data packet with a fixed data packet length and a data packet with an unfixed data packet length;

a sending unit, configured to send resource allocation information to the station, where the resource allocation information includes a transmission resource identifier allocated by the access point to the station, and the transmission resource identifier corresponds to a random access resource selected by the station;

In a first possible implementation manner of the eighth aspect, the packet with a fixed packet length includes: a terminal-to-terminal D2D discovery request frame, a D2D discovery response frame, a D2D link establishment request frame, a D2D link establishment response frame;

The embodiment of the invention provides a random access method, a site and an access point, wherein in the random access method, the site acquires random access resources distributed by the access point; sending a random access request to an access point on random access resources, wherein the random access request comprises a type field of data to be sent by a station, the type of the data to be sent comprises a data packet with a fixed data packet length and a data packet with an unfixed data packet length, so that the access point knows how large transmission resources the station needs according to a type identifier of the data carried in the random access request, and then allocating transmission resources specially used for transmitting the data to the station, namely the station receives resource allocation information sent by the access point, the resource allocation information comprises a transmission resource identifier allocated to the station by the access point, the transmission resource identifier corresponds to the type field in the random access request, and further the station sends the data to be sent on the transmission resources of the resource allocation information. Compared with the prior art, the station in the embodiment of the invention enables the access point to allocate corresponding transmission resources according to the type field of the data to be sent by carrying the type field of the data to be sent in the random access request, so that the station can send the data to be sent on the allocated transmission resources, the interaction flow of the random access process is reduced, the signaling transmission overhead is further reduced, and the time delay is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a diagram of a frame structure in the prior art;

fig. 2 is a schematic view of an application scenario provided in the embodiment of the present invention;

fig. 3 is a schematic diagram of a random access method according to an embodiment of the present invention;

fig. 4 is a frame structure diagram of a data packet with a fixed data packet length according to an embodiment of the present invention;

fig. 5 is a first schematic diagram illustrating a method for performing random access when a station is a first D2D station according to a first embodiment of the present invention;

fig. 6 is a schematic diagram illustrating a second method for performing random access when a station is a first D2D station according to a first embodiment of the present invention;

fig. 7 is a first schematic diagram illustrating a method for performing random access when a station is a second D2D station according to a first embodiment of the present invention;

fig. 8 is a schematic diagram illustrating a second method for performing random access when the station is a second D2D station according to a first embodiment of the present invention;

fig. 9 is a schematic diagram of a random access method according to a second embodiment of the present invention;

fig. 10 is a first schematic diagram illustrating a method for performing random access when a station is a first D2D station according to a second embodiment of the present invention;

fig. 11 is a schematic diagram illustrating a second method for performing random access when a station is a first D2D station according to a second embodiment of the present invention;

fig. 12 is a first schematic diagram illustrating a method for performing random access when a station is a second D2D station according to a second embodiment of the present invention;

fig. 13 is a second schematic diagram illustrating a method for performing random access when the station is a second D2D station according to a second embodiment of the present invention;

fig. 14 is a schematic diagram of a random access method according to a third embodiment of the present invention;

fig. 15 is a schematic diagram of a random access method according to a fourth embodiment of the present invention;

fig. 16 is a schematic diagram of a random access method according to a fifth embodiment of the present invention;

fig. 17(a) is a diagram illustrating a STA1 performing random access according to a fifth embodiment of the present invention;

fig. 17(b) is a diagram illustrating a STA2 performing random access according to a fifth embodiment of the present invention;

fig. 18 is a schematic diagram of a random access method according to a sixth embodiment of the present invention;

fig. 19 is a diagram illustrating random access resources allocated by an access point according to a sixth embodiment of the present invention;

fig. 20 is a schematic diagram of a station according to a seventh embodiment of the present invention;

fig. 21 is a schematic diagram of a seventh D2D station according to the embodiment of the present invention;

fig. 22 is a schematic diagram of a second D2D station as a seven station according to the embodiment of the present invention;

fig. 23 is a schematic diagram of a station according to an eighth embodiment of the present invention;

fig. 24 is a schematic diagram of an eighth station being a first D2D station according to the embodiment of the present invention;

fig. 25 is a schematic diagram of an eighth site being a second D2D site according to an embodiment of the present invention

Fig. 26 is a schematic diagram of an access point according to a ninth embodiment of the present invention;

fig. 27 is a schematic diagram of an access point according to a tenth embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Before the description of the embodiments of the present invention is introduced, an application scenario of the embodiments of the present invention is first introduced, as shown in fig. 2, specifically:

the embodiment of the invention can be applied to a wireless local area network, wherein the wireless local area network can comprise a plurality of Basic Service sets (BSS for short), a network node in the Basic Service sets is a Station (STA for short), and the Station comprises an Access Point Station (AP for short) and a Non-Access Point Station (Non-AP STA for short). Each basic service set may include one AP and a plurality of Non-AP STAs associated with the AP.

An Access Point (AP, english: Access Point) is also called as a wireless Access Point or a hotspot. The AP is an access point for a mobile subscriber to enter a wired network, and is mainly deployed in a home, a building, and a campus, and typically has a coverage radius of several tens of meters to hundreds of meters, and may be deployed outdoors. The AP acts as a bridge connecting the network and the wireless network, and mainly functions to connect the wireless network clients together and then to access the wireless network to the ethernet. The standard mainly used by APs at present is the IEEE (Institute of Electrical and electronics Engineers, Chinese) 802.11 series. Specifically, the AP may be a terminal device or a network device with a WiFi chip. Optionally, the AP may be a device supporting 802.11ax standard, and further optionally, the AP may be a device supporting multiple WLAN (english: wireless local Area Network) standards such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11 a.

A Non-Access Point (Non-AP STA) may be a wireless communication chip, a wireless sensor, or a wireless communication terminal. For example: the mobile phone supporting the wireless fidelity (WiFi for short) communication function, the tablet computer supporting the WiFi communication function, the set top box supporting the WiFi communication function, the smart television supporting the WiFi communication function, the smart wearable device supporting the WiFi communication function, and the computer supporting the WiFi communication function. Optionally, the station may support an 802.11ax system, and further optionally, the station supports multiple WLAN systems such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11 a. Fig. 2 is a system diagram of a typical WLAN deployment scenario, including an AP and 4 STAs, wherein STAs 1-2 have D2D transmission capabilities and participate in D2D transmissions. The embodiment of the present invention is specifically described with respect to the application scenario shown in fig. 2.

Example one

An embodiment of the present invention provides a random access method, as shown in fig. 3, including:

step 101, a station acquires a random access resource allocated by an access point.

The random access resource is a resource required when a station sends a random access request to an access point when new data needs to be sent but uplink resources are not allocated.

Step 102, sending a random access request to an access point on a random access resource, wherein the random access request comprises a type field of data to be sent by a station, and the type of the data to be sent comprises a data packet with a fixed data packet length and a data packet with an unfixed data packet length.

Wherein, the data packet with fixed data packet length includes: a D2D discovery request frame, a D2D discovery response frame, a D2D link establishment request frame, and a D2D link establishment response frame; the data packet with the unfixed data packet length comprises the following data packets: D2D resource request frame, D2D data frame.

As for the frame structure of the data packet with a fixed data packet length, refer to fig. 4, wherein Category is used to indicate the frame type, TA (english: Transmission Address, chinese: Transmission Address) is used to indicate the Address information of the transmitting end, and RA (english: Receive Address, chinese: reception Address) is used to indicate the Address information of the receiving end; optionally, as shown in fig. 4, the frame structure of the data packet with a fixed data packet length may further include a Capability field, where the Capability field is used to indicate Capability information of a station that transmits the frame structure, such as supported bandwidth, rate, or currently available spectrum resource.

For example, the Category field may be identified by 4 bits of information, such as 0001, which may identify the frame as a D2D discovery request frame, 0010 which identifies the frame as a D2D discovery response frame, 0100 which identifies the frame as a D2D link establishment request frame, and 1000 which identifies the frame as a D2D link establishment response frame. The embodiment of the present invention does not limit the Category field identified in other manners to distinguish different frame types.

Step 103, receiving resource allocation information sent by the access point, where the resource allocation information includes a transmission resource identifier allocated by the access point for the station, and the transmission resource identifier corresponds to a type field in the random access request.

Wherein, the correspondence between the transmission resource identifier in the resource allocation information and the type field in the random access request specifically includes: when the type field of the data to be sent, which is sent to the access point by the station, is a data packet with a fixed data packet length, the access point allocates transmission resources for the station to transmit the data packet with the fixed data packet length according to the type field, and informs the station by sending resource allocation information, namely the station receives the resource allocation information sent by the access point; when the type field of the data to be sent, which is sent to the access point by the station, is a data packet with an unfixed data packet length, the access point allocates transmission resources for the station to transmit the data packet with the unfixed data packet length according to the type field, and informs the station by sending resource allocation information, that is, the station receives the resource allocation information sent by the access point.

And step 104, sending data to be sent on the transmission resources of the resource allocation information.

By carrying the type field of the data to be transmitted in the random access request, the access point determines whether the data packet with fixed data packet length needs to be transmitted by the station or the data packet with unfixed data packet length needs to be transmitted by the station according to the type field of the data to be transmitted, and then allocates corresponding transmission resources to the station, so that the station transmits the data to be transmitted on the allocated transmission resources.

Optionally, if the station obtained in step 101-104 is the first D2D station and the first D2D station finds the request frame for the data to be sent generated by the service is D2D, step 104 specifically includes: the first D2D station transmits a D2D discovery request frame on a transmission resource of the resource allocation information. The first D2D station sends the D2D discovery request frame, which may be in a broadcast, multicast or unicast manner.

Further, after the first D2D station sends the D2D discovery request frame on the transmission resource of the resource allocation information, if the peer station performing D2D discovery by the first D2D station is the second D2D station, as shown in fig. 5, the method includes:

step 105, the first D2D station listens for first resource allocation information sent by an access point, where the first resource allocation information includes a transmission resource identifier allocated by the access point to the second D2D station, and the transmission resource is used for the second D2D station to transmit a D2D discovery response frame.

Since the second D2D station sending the D2D discovery response frame needs to transmit on the transmission resource of the first resource allocation information allocated by the access point, the first D2D station needs to listen to the transmission resource allocated by the access point for the second D2D station.

And 106, monitoring a D2D discovery response frame sent by the second D2D station on the transmission resource of the first resource allocation information.

If the first D2D station detects the D2D discovery response frame sent by the first D2D station on the transmission resource of the first resource allocation information, the D2D discovery of the first D2D station and the second D2D station is finished; if the first D2D station does not sense the D2D discovery response frame sent by the first D2D station on the transmission resource of the first resource allocation information, the first D2D station may execute step 101 to re-perform the random access procedure, and if the re-try of the random access procedure exceeds a certain number of times and does not sense the D2D discovery response frame sent by the second D2D station, the first D2D station abandons the random access.

Optionally, if the station obtained in step 101-104 is the first D2D station and the first D2D station finds the request frame for the data to be sent generated by the service is D2D, step 104 specifically includes: the first D2D station transmits the D2D link establishment request frame on the transmission resource of the resource allocation information. The first D2D station sends the D2D link establishment request frame, which may be in a broadcast, multicast or unicast manner.

Further, after the first D2D station sends the D2D link establishment request frame on the transmission resource of the resource allocation information, if the peer station performing D2D link establishment by the first D2D station is the second D2D station, as shown in fig. 6, the method includes:

step 107, the first D2D station listens for third resource allocation information sent by the access point, where the third resource allocation information includes a transmission resource identifier allocated by the access point to the second D2D station, and the transmission resource is used for the second D2D station to transmit a D2D link establishment response frame.

Since the second D2D station sending the D2D link establishment response frame needs to transmit on the transmission resource of the third resource allocation information allocated by the access point, the first D2D station needs to listen to the transmission resource allocated by the access point for the second D2D station.

And 108, monitoring a D2D link establishment response frame sent by the second D2D station on the transmission resource of the third resource allocation information.

If the first D2D station detects the D2D link establishment response frame sent by the first D2D station on the transmission resource of the first resource allocation information, the D2D discovery of the first D2D station and the second D2D station is ended; if the first D2D station does not detect the D2D link establishment response frame sent by the first D2D station on the transmission resource of the first resource allocation information, the first D2D station may execute step 101 to re-perform the random access procedure, and if the re-determined random access procedure exceeds a certain number of times and does not detect the D2D link establishment response frame sent by the second D2D station, the first D2D station abandons the random access.

When the data to be transmitted generated by the first D2D station according to the service is a resource request frame or a data frame, the first D2D station transmits the resource request frame on the transmission resource of the resource allocation information, which may be according to the random access method described in the embodiment of the present invention, or according to a prior art scheme, first transmits a random access request for data to be transmitted to request to transmit a resource for transmitting specific resource request information, so that the access point allocates the transmission resource according to the random access request to transmit specific resource request information, for example, resource request information for transmitting information such as specific buffer, QoS, channel state, and the like, for requesting the resource for transmitting data. And the access point allocates resources for transmitting the specific data according to the resource request information, and then the station transmits data on the resources allocated by the access point for transmitting the specific data.

Optionally, if the station described in

step

101 and 104 is the second D2D station, and the second D2D station is a D2D discovery response frame according to the data to be sent generated by the service, before the second D2D performs step 101, the second D2D station needs to listen to the D2D discovery request frame sent by the first D2D station, and therefore, as shown in fig. 7, the method further includes:

step 109, the second D2D station listens for second resource allocation information sent by the access point, where the second resource allocation information includes a transmission resource identifier allocated by the access point to the first D2D station, and the transmission resource is used for the first D2D station to transmit the D2D discovery request frame.

Since the first D2D station transmitting the D2D discovery request frame needs to transmit on the transmission resource of the second resource allocation information allocated by the access point, the second D2D station needs to listen to the transmission resource allocated by the access point for the first D2D station.

In step 110, the second D2D station listens to the D2D discovery request frame sent by the first D2D station on the transmission resource of the second resource allocation information.

If the second D2D station detects the D2D discovery request frame sent by the first D2D station on the transmission resource of the second resource allocation information, step 101 and step 104 are executed, and in step 104, the second D2D station sends a D2D discovery response frame on the transmission resource of the resource allocation information.

Optionally, if the station described in

step

101 and 104 is the second D2D station, and the second D2D station sets up the response frame for the D2D link according to the data to be sent generated by the service, before the second D2D performs step 101, the second D2D station needs to listen to the D2D link setup request frame sent by the first D2D station, so as shown in fig. 8, the method further includes:

step 111, the second D2D station listens to the access point and sends fourth resource allocation information, where the fourth resource allocation information includes a transmission resource identifier allocated by the access point to the first D2D station, and the transmission resource is used for the first D2D station to transmit a D2D link establishment request frame.

Since the first D2D station sending the D2D link establishment request frame needs to transmit on the transmission resource of the second resource allocation information allocated by the access point, the second D2D station needs to listen to the transmission resource allocated by the access point for the first D2D station.

And 112, monitoring a D2D link establishment request frame sent by the first D2D station on the transmission resource of the fourth resource allocation information.

If the second D2D station detects the D2D link establishment request frame sent by the first D2D station on the transmission resource of the fourth resource allocation information, step 101 and step 104 are executed, and in step 104, the second D2D station sends a D2D link establishment response frame on the transmission resource of the resource allocation information.

The embodiment of the invention provides a random access method, wherein a site acquires random access resources distributed by an access point; sending a random access request to an access point on random access resources, wherein the random access request comprises a type field of data to be sent by a station, the type of the data to be sent comprises a data packet with a fixed data packet length and a data packet with an unfixed data packet length, so that the access point knows whether the station needs to transmit the data packet with the fixed data packet length or the data packet with the unfixed data packet length according to a type identifier of the data carried in the random access request, and further allocates transmission resources specially used for transmitting the data packet to the station, namely the station receives resource allocation information sent by the access point, the resource allocation information comprises a transmission resource identifier allocated to the station by the access point, the transmission resource identifier corresponds to the type field in the random access request, and further the station sends the data to be sent on the transmission resources of the resource allocation information. Compared with the prior art, the station in the embodiment of the invention enables the access point to allocate corresponding transmission resources according to the type field of the data to be sent by carrying the type field of the data to be sent in the random access request, so that the station can send the data to be sent on the allocated transmission resources, the interaction flow of the random access process is reduced, the signaling transmission overhead is further reduced, and the time delay is reduced.

Example two

An embodiment of the present invention provides a random access method, as shown in fig. 9, including:

step 201, a station acquires a random access resource allocated by an access point, where the random access resource includes a random access resource for performing random access on a data packet with a fixed data packet length and a random access resource for performing random access on a data packet with an unfixed data packet length.

Wherein, the data packet with fixed data packet length includes: a D2D discovery request frame, a D2D discovery response frame, a D2D link establishment request frame, and a D2D link establishment response frame; the data packet with the unfixed data packet length comprises the following data packets: D2D resource request frame, D2D data frame. For the frame structure of the data packet with a fixed data packet length, reference may be made to fig. 4 and described in the first embodiment, which are not described herein again.

Step 202, according to the type of the data packet to be sent, selecting to send a random access request on a corresponding random access resource, wherein the type of the data packet to be sent comprises a data packet with a fixed data packet length and a data packet with an unfixed data packet length.

Specifically, if a random access resource for performing random access on a data packet with a fixed data packet length is referred to as a first random access resource, and a random access resource for performing random access on a data packet with an unfixed data packet length is referred to as a second random access resource, then, when the type of the data packet to be sent by the station is a data packet with a fixed data packet length, the station selects the first random access resource, sends a random access request to the station on the first random access resource, and when the type of the data packet to be sent by the station is a data packet with an unfixed data packet length, the station selects the second random access resource, and sends a random access request to the station on the second random access resource.

Step 203, receiving resource allocation information sent by the access point, where the resource allocation information includes a transmission resource identifier allocated by the access point for the station, and the transmission resource identifier corresponds to the selected random access resource.

According to the

steps

201 and 202, since the access point divides the random access resource allocated to the station into the first random access resource and the second random access resource, when the station sends a random access request to the access point on the first random access resource, the access point confirms that the station needs to send a data packet with a fixed data packet length, and further allocates transmission resources for the station to transmit the data packet with the fixed data packet length, and informs the station by sending resource allocation information, that is, the station receives resource allocation information sent by the access point; when the station sends a random access request to the access point on the second random access resource, the access point confirms that the station needs to send a data packet with an unfixed data packet length, and then allocates transmission resources for the station to transmit the data packet with the unfixed data packet length, and informs the station by sending resource allocation information, namely the station receives the resource allocation information sent by the access point.

And step 204, sending data to be sent on the transmission resources of the resource allocation information.

According to the random access method described in

step

201 and 204, the corresponding random access resource is selected according to the type of the data to be transmitted, so that the access point determines, according to the random access resource selected by the station, whether the data packet that the station needs to transmit is a data packet with a fixed length or a data packet that the station needs to transmit is a data packet with a non-fixed length, and then allocates the corresponding transmission resource to the station, so that the station transmits the data to be transmitted on the allocated transmission resource.

Optionally, when the station in

step

201 and 204 is the first D2D station, and the first D2D station finds the request frame for the D2D according to the data to be sent generated by the service, the step 204 specifically includes: the first D2D station transmits a D2D discovery request frame on the transmission resource of the resource allocation information. The first D2D station sends the D2D discovery request frame, which may be in a broadcast, multicast or unicast manner.

Further, after the first D2D station sends the D2D discovery request frame on the transmission resource of the resource allocation information, if the peer station performing D2D discovery by the first D2D station is the second D2D station, as shown in fig. 10, the method further includes:

step 205, the first D2D station listens to first resource allocation information sent by the access point, where the first resource allocation information includes a transmission resource identifier allocated by the access point to the second D2D station, and the transmission resource is used for the second D2D station to transmit the D2D discovery response frame.

Step 206, the first D2D station listens to the D2D discovery response frame sent by the second D2D station on the transmission resource of the first resource allocation information.

If the first D2D station detects the D2D discovery response frame sent by the first D2D station on the transmission resource of the first resource allocation information, the D2D discovery of the first D2D station and the second D2D station is finished; if the first D2D station does not sense the D2D discovery response frame sent by the first D2D station on the transmission resource of the first resource allocation information, the first D2D station may execute step 201 to re-perform the random access procedure, and if the re-try of the random access procedure exceeds a certain number of times and does not sense the D2D discovery response frame sent by the second D2D station, the first D2D station abandons the random access.

Optionally, when the station in

step

201 and 204 is the first D2D station, and the first D2D station establishes the request frame for the D2D link according to the data to be sent generated by the service, the step 204 specifically includes: the first D2D station transmits a D2D link establishment request frame on the transmission resources of the resource allocation information. The first D2D station sends the D2D link establishment request frame, which may be in a broadcast, multicast or unicast manner.

Further, after the first D2D station sends the D2D link establishment request frame on the transmission resource of the resource allocation information, if the peer station performing D2D link establishment by the first D2D station is the second D2D station, as shown in fig. 11, the method further includes:

step 207, the first D2D station listens to third resource allocation information sent by the access point, where the third resource allocation information includes a transmission resource identifier allocated by the access point to the second D2D station, and the transmission resource is used for the second D2D station to transmit a D2D link establishment response frame;

and step 208, the first D2D station listens to the D2D link establishment response frame sent by the second D2D station on the transmission resource of the third resource allocation information.

If the first D2D station detects the D2D link establishment response frame sent by the first D2D station on the transmission resource of the first resource allocation information, the D2D discovery of the first D2D station and the second D2D station is ended; if the first D2D station does not detect the D2D link establishment response frame sent by the first D2D station on the transmission resource of the first resource allocation information, the first D2D station may execute step 201 to re-perform the random access procedure, and if the re-determined random access procedure exceeds a certain number of times and does not detect the D2D link establishment response frame sent by the second D2D station, the first D2D station abandons the random access.

Optionally, if the station described in

step

201 and 204 is the second D2D station, and the second D2D station is a D2D discovery response frame according to the data to be sent generated by the service, before the second D2D performs step 201, the second D2D station needs to listen to the D2D discovery request frame sent by the first D2D station, and therefore, as shown in fig. 12, the method further includes:

step 209, the second D2D station listens to second resource allocation information sent by the access point, where the second resource allocation information includes a transmission resource identifier allocated by the access point to the first D2D station, and the transmission resource is used for the first D2D station to transmit the D2D discovery request frame.

Step 210, on the transmission resource of the second resource allocation information, listening to a D2D discovery request frame sent by the first D2D station.

If the second D2D station detects the D2D discovery request frame sent by the first D2D station on the transmission resource of the second resource allocation information, step 201 and step 204 are executed, and in step 204, the second D2D station sends a D2D discovery response frame on the transmission resource of the resource allocation information.

Optionally, if the station described in

step

201 and 204 is the second D2D station, and the second D2D station is a D2D link establishment response frame according to data to be sent generated by the service, before the second D2D performs step 201, the second D2D station needs to monitor the D2D link establishment request frame sent by the first D2D station, and therefore, as shown in fig. 13, the method further includes:

step 211, the second D2D station listens to fourth resource allocation information sent by the access point, where the fourth resource allocation information includes a transmission resource identifier allocated by the access point to the first D2D station, and the transmission resource is used for the first D2D station to transmit a D2D link establishment request frame

Step 212, on the transmission resource of the fourth resource allocation information, listening to a D2D link establishment request frame sent by the first D2D station.

If the second D2D station detects the D2D link establishment request frame sent by the first D2D station on the transmission resource of the fourth resource allocation information, step 301 and step 304 are executed, and in step 304, the second D2D station sends a D2D link establishment response frame on the transmission resource of the resource allocation information.

The embodiment of the invention provides a random access method.A site acquires random access resources distributed by an access point, wherein the random access resources comprise random access resources for random access of a data packet with a fixed data packet length and random access resources for random access of a data packet with an unfixed data packet length; the method comprises the steps that according to the type of a data packet to be sent, a random access request is selected to be sent on a corresponding random access resource, the type of the data packet to be sent comprises the data packet with a fixed data packet length and the data packet with a non-fixed data packet length, an access point knows whether the data packet with the fixed data packet length needs to be transmitted by a station or the data packet with the non-fixed data packet length according to the random access resource selected by the station, resource allocation information is sent to the station, the resource allocation information comprises a transmission resource identifier allocated to the station by the access point, the transmission resource identifier corresponds to the selected random access resource, and data to be sent are sent on the transmission resource of the resource allocation information. Compared with the prior art, the station in the embodiment of the invention enables the access point to allocate the corresponding transmission resource according to the selected random access resource by selecting the random access resource allocated by the access point, so that the station can send the data to be sent on the allocated transmission resource, the interaction flow in the random access process is reduced, the signaling transmission overhead is further reduced, and the time delay is reduced.

EXAMPLE III

An embodiment of the present invention provides a random access method, as shown in fig. 14, including:

step 301, the access point allocates a random access resource to the station.

Step 302, receiving a random access request sent by the station on the random access resource, where the random access request includes a type field of data to be sent by the station, and the type of the data to be sent includes a data packet with a fixed data packet length and a data packet with an unfixed data packet length.

Step 303, sending resource allocation information to the station, where the resource allocation information includes a transmission resource identifier allocated by the access point to the station, and the transmission resource identifier corresponds to the type field in the random access request.

When the access point receives that the type field of the data to be sent by the station is a data packet with fixed data packet length, the access point allocates transmission resources according to the type field to be used for the station to transmit the data packet with fixed data packet length, and informs the station by sending resource allocation information; when the access point receives that the type field of the data to be sent by the station is a data packet with an unfixed data packet length, the access point allocates transmission resources according to the type field for the station to transmit the data packet with the unfixed data packet length, and sends resource allocation information to inform the station.

Step 304, receiving the data to be sent by the station on the transmission resource of the resource allocation information.

The embodiment of the invention provides a random access method, an access point determines a data packet with fixed length of a data packet to be transmitted by a station or a data packet with unfixed length of the data packet according to a type field of data to be transmitted in a random access request sent by the station, and then allocates corresponding transmission resources for the station, so that the station can send data to be transmitted on the allocated transmission resources.

Example four

An embodiment of the present invention provides a random access method, as shown in fig. 15, including:

step 401, the access point allocates a random access resource to the station, where the random access resource includes a random access resource for performing random access on a data packet with a fixed data packet length and a random access resource for performing random access on a data packet with an unfixed data packet length.

Step 402, receiving a random access request sent by the station on a corresponding random access resource according to a type of a data packet to be sent, where the type of the data packet to be sent includes a data packet with a fixed data packet length and a data packet with an unfixed data packet length.

Specifically, if a random access resource for performing random access on a data packet with a fixed data packet length is called a first random access resource, and a random access resource for performing random access on a data packet with an unfixed data packet length is called a second random access resource, then, when the type of the data packet to be sent by the station is a data packet with a fixed data packet length, the station selects the first random access resource, and then, the access point receives a random access request sent by the station on the first random access resource; and when the type of the data packet to be sent by the station is a data packet with a data packet length not fixed, the station selects a second random access resource, and then the access point receives a random access request sent by the station on the second random access resource.

Step 403, sending resource allocation information to the station, where the resource allocation information includes a transmission resource identifier allocated by the access point to the station, and the transmission resource identifier corresponds to the random access resource selected by the station.

According to the

steps

401 and 402, since the access point divides the random access resource allocated to the station into the first random access resource and the second random access resource, when the access point receives the random access request sent by the station on the first random access resource, the access point confirms that the station needs to send the data packet with fixed data packet length, and further allocates the transmission resource for the station to transmit the data packet with fixed data packet length, and informs the station by sending the resource allocation information; when the access point receives a random access request sent by the station on the second random access resource, the access point confirms that the station needs to send a data packet with an unfixed data packet length, and then allocates transmission resources for the station to transmit the data packet with the unfixed data packet length, and informs the station by sending resource allocation information.

Step 404, receiving data to be sent by the station on the transmission resource of the resource allocation information.

The embodiment of the invention provides a random access method, an access point determines whether a data packet with fixed length needs to be transmitted by a station or a data packet with unfixed length according to a random access resource selected by the station when the station sends a random access request, and then allocates corresponding transmission resources for the station, so that the station sends data to be sent on the allocated transmission resources.

EXAMPLE five

The embodiment of the invention adopts the random access methods described in the first embodiment and the third embodiment to realize D2D discovery. As shown in fig. 2, an application scenario of the method is that STA1 is closer to STA2, STA1 wants to implement interconnection with STA2 by sending a D2D discovery request frame, and further implements direct transmission of data between STA1 and STA2, and for STA1 and STA2, communication between each station and an AP is a random access procedure.

In the embodiment of the present invention, taking D2D discovery by STA1 and STA2 as an example, assuming that STA1 is an initiator (i.e., a source station) discovered by D2D, and STA2 is an opposite party (i.e., a target station) of D2D transmission that STA1 wants to discover, as shown in fig. 16, specifically:

step 501, STA1 obtains the random access resource allocated by the access point AP.

To facilitate transmission of the D2D traffic, the AP may exclusively allocate a part of the random access resources to the D2D traffic (as shown by the slashed part in fig. 17 (a)), where the random access resources may be located in a signaling (e.g., SIG) part as shown in fig. 17(a) or an uplink transmission slot (UL subframe) part. Generally, the random access resource is located in an uplink transmission period. For example, if n orthogonal random access codes are included in the random access resource, m of the n orthogonal random access codes may be allocated to the D2D service.

Step 502, STA1 sends a random access request to the AP on the allocated random access resource, and correspondingly, the AP receives the random access request sent by STA 1.

The random access request sent by STA1 to the AP includes a type field of data to be sent by STA1, and the data to be sent is a D2D discovery request frame. For example, STA1 may transmit 1-bit information in the random access code sent to the AP, the 1-bit information indicating that this is STA1 sending the D2D discovery request frame field.

The embodiment of the present invention takes an example that when the STA1 needs to send a resource request for transmitting a discovery request, the STA uses a random access resource dedicated to the D2D service and allocated by the AP, and carries 1-bit information.

Step 503, the AP sends the first MAP information to the STA 1.

When the AP receives a random access request sent by the STA1, it is determined that the STA1 needs to send a D2D discovery request frame with a fixed packet length according to 1 bit information in the random access request, and further allocates a transmission resource for the STA1 to transmit the D2D discovery request frame, the AP identifies the transmission resource allocated to the STA1 in first MAP information, and sends the first MAP information identifying the transmission resource allocated to the STA1 to the STA1, as shown in fig. 17(a), the AP identifies the transmission resource allocated to the STA1 in the first MAP through a D2D indicator, and an english resource identified by the D2D indicator for transmitting the D2D discovery request frame (D2 dsiscovery request) is located on a downlink transmission slot (DL subframe).

Step 504, the STA1 listens for the first MAP information sent by the AP for a first predetermined time.

In step 505, if the STA1 senses the first MAP information sent by the AP within the first preset time, the STA1 broadcasts the D2D discovery request frame on the transmission resource indicated by the first MAP information.

In the embodiment of the present invention, for a D2D discovery request frame sent by an STA1, a Category field in the discovery request frame indicates that the frame is a D2D discovery request frame, a TA indicates address information of the STA1, an RA indicates address information of the STA2, and a Capability field indicates information such as a bandwidth, a rate, or currently available spectrum resources supported by the STA 1.

If the STA1 does not hear the first MAP information sent by the AP within the first predetermined time, the STA1 re-executes step 501. And if the retry exceeds a certain number of times and the first MAP transmission instruction sent by the AP is still not received, abandoning the random access process.

Step 506, STA2 listens for the first MAP information sent by the AP to STA1 and listens for the D2D discovery request frame broadcast by STA1 on the transmission resources indicated by the first MAP information.

Since the D2D discovery request frame sent by STA1 includes the address information of STA2, step 507 is executed if STA2 detects the D2D discovery request frame broadcast by STA 1.

In step 507, if STA2 detects the D2D discovery request frame sent by STA1, STA2 obtains the random access resource allocated by the AP.

Step 508, STA2 sends a random access request to the AP on the allocated random access resource, and correspondingly, the AP receiving STA2 sends a random access request.

Since the STA2 senses that the D2D Discovery request frame sent by the STA1 is related to itself, the STA2 needs to send a D2D Discovery Response frame (english: D2D Discovery Response) to the STA1, if the STA1 needs to send a D2D Discovery Response frame, the STA2 needs to apply for transmission of a transmission resource of the D2D Discovery Response frame to the AP, and therefore, the STA2 sends a random access request to the AP, and the random access request carries 1-bit information for stating that the random access request is the D2D Discovery Response frame with a fixed packet length.

In step 509, the AP transmits the second MAP information to the STA2 according to the random access request transmitted by the STA 2.

When the AP receives the random access request transmitted by STA2, it is determined that STA2 needs to transmit the D2D discovery response frame according to the 1-bit information in the random access request, and therefore, a transmission resource for transmitting the D2D discovery response frame is allocated to STA2, and the allocated transmission resource is indicated in the second MAP information transmitted to STA 2. As shown in fig. 17(b), the AP identifies transmission resources allocated to the STA2 by a D2D indicator in the second MAP, and the resources identified by the D2D indicator for transmitting the D2D discovery response frame are located on a downlink transmission slot (DL/UL subframe).

Step 510, the STA2 listens for a second MAP message sent by the AP for a second predetermined time.

In step 511, if the STA2 senses the second MAP information transmitted by the AP within the second preset time, the STA2 transmits a D2D discovery response frame to the STA1 on the transmission resource indicated in the second MAP information.

In the embodiment of the present invention, referring to fig. 4, for the frame structure of the D2D discovery response frame, for the D2D discovery response frame sent by STA2, the Category field indicates that the frame is a D2D discovery response, TA indicates address information of STA2, RA indicates address information of STA1, and the Capability field indicates that STA2 and STA1 negotiate link establishment in the subsequent D2D link establishment process.

If the STA2 does not hear the second MAP information sent by the AP within the second predetermined time, the STA2 re-executes step 507. If the retry exceeds a certain number of times and still does not sense the second MAP information sent by the AP, the STA2 abandons the random access procedure.

Step 512, STA1 listens for the second MAP information that the AP sent to STA2, and listens on the transmission resources indicated by the second MAP information whether STA2 sent the D2D discovery response frame.

Step 513, if STA1 detects the D2D discovery response frame sent by STA2, the active discovery establishment between STA1 and STA2 is completed.

If STA1 does not listen to the D2D discovery response frame sent by STA2, STA1 executes step 501 to resume the D2D discovery request procedure. If the retry exceeds a certain number of times and still does not receive the D2D request response sent by the STA2, the D2D active discovery procedure is abandoned.

It should be noted that "first" and "second" in the first MAP information and the second MAP information in the embodiment of the present invention are only used to distinguish that the AP is allocated to the source station and the target station, and meanwhile, when the source station and the target station perform D2D link establishment, the method described in the embodiment of the present invention may be referred to for specific steps, and details are not described herein again.

The embodiment of the invention provides a random access method, which is characterized in that a type field of data to be transmitted is carried in a random access request, so that an access point determines whether a data packet with a fixed data packet length needs to be transmitted by a station or a data packet with an unfixed data packet length is transmitted according to the type field of the data to be transmitted, and then corresponding transmission resources are allocated to the station, so that the station can transmit the data to be transmitted on the allocated transmission resources.

EXAMPLE six

The embodiment of the present invention adopts the random access method described in the second embodiment and the fourth embodiment to implement D2D discovery, and an application scenario of the method is shown in fig. 2, where an STA1 is closer to an STA2, the STA1 wants to implement interconnection with an STA2 by sending a D2D discovery request frame, and further implements direct transmission of data between an STA1 and an STA2, and for the STA1 and the STA2, communication between each station and an AP is a random access process.

In the embodiment of the present invention, D2D discovery performed by STA1 and STA2 is taken as an example for explanation, assuming that STA1 is an initiator (i.e., a source station) discovered by D2D, and STA2 is an opposite party (i.e., a target station) of D2D transmission that STA1 wants to discover, as shown in fig. 18, specifically:

step 601, STA1 obtains the random access resource allocated by the access point AP.

The random access resources allocated to STA1 and STA2 by the AP include random access resources for performing random access on data packets with fixed packet lengths and random access resources for performing random access on data packets with non-fixed packet lengths.

For example, as shown in fig. 19, in order to facilitate transmission of D2D traffic, the AP may exclusively allocate a part of random access resources to D2D traffic (as indicated by oblique lines and double oblique lines in fig. 19), and at the same time, divide the resources exclusively allocated to D2D traffic into first random access resources (as indicated by oblique lines in fig. 19) for transmitting packets with fixed packet lengths, such as D2D discovery request frames, D2D discovery response frames, D2D link establishment request frames, and D2D link establishment response frames, and second random access resources (as indicated by double oblique lines in fig. 19) for transmitting packets with non-fixed packet lengths, such as D2D resource request frames and data frames.

Step 602, the STA1 sends a random access request to the AP on the first random access resource, and correspondingly, the AP receives the random access request sent by the STA1 on the first random access resource.

Since STA1 sends a request frame for D2D according to data to be sent generated by traffic, and the length of the request frame is fixed in D2D, STA1 selects the first random access resource to send a random access request, where the random access request includes a type field of the request frame sent by STA1 to D2D.

Step 603, the AP sends the first MAP information to the STA 1.

When the AP receives a random access request sent by STA1 on a first random access resource, it determines that STA1 needs to send a D2D discovery request frame with a fixed packet length, and further allocates a transmission resource for STA1 to transmit the D2D discovery request frame, the AP identifies the transmission resource allocated to STA1 in first MAP information, and sends the first MAP information identifying the transmission resource allocated to STA1 to STA 1. For the transmission resource allocated by the AP to the station STA1, reference may be made to the description in the fifth embodiment and fig. 17(a), which is not described herein again.

Step 604, STA1 listens for the first MAP information sent by the AP for a first predetermined time.

In step 605, if the STA1 senses the first MAP information sent by the AP within the first preset time, the STA1 broadcasts the D2D discovery request frame on the transmission resource indicated by the first MAP information.

In the embodiment of the present invention, reference is made to fig. 4 for a structure of a D2D discovery request frame sent by STA1, where a Category field in the D2D discovery request frame sent by STA1 indicates that the frame is a D2D discovery request frame, TA indicates address information of STA1, RA indicates address information of STA2, and a Capability field indicates information such as bandwidth, rate, or currently available spectrum resources supported by STA 1.

If the STA1 does not hear the first MAP information sent by the AP within the first predetermined time, the STA1 re-executes step 601. And if the retry exceeds a certain number of times and the first MAP transmission instruction sent by the AP is still not received, abandoning the random access process.

Step 606, STA2 listens for the first MAP information sent by the AP to STA1 and listens for the D2D discovery request frame broadcast by STA1 on the transmission resources indicated by the first MAP information.

Since the D2D discovery request frame sent by STA1 includes the address information of STA2, step 607 is executed if STA2 detects the D2D discovery request frame broadcast by STA 1.

Step 607, if STA2 detects the D2D discovery request frame sent by STA1, STA2 obtains the random access resource allocated by the AP.

Step 608, the STA2 sends a random access request to the AP on the allocated random access resource, and correspondingly, the AP receiving STA2 sends a random access request.

Since STA2 senses that the D2D discovery request frame sent by STA1 is related to itself, STA2 needs to send a D2D discovery response frame to STA1, and if it needs to send a D2D discovery response frame to STA1, STA2 needs to apply for transmission resources for transmitting the D2D discovery response frame to the AP, therefore, STA2 sends a random access request to the AP, and the random access request carries 1-bit information for stating that it is a D2D discovery response frame with a fixed packet length.

Step 609, when the AP receives the random access request sent by the STA2, it determines that the STA2 needs to send the D2D discovery response frame according to the 1-bit information in the random access request, and therefore, allocates a transmission resource for transmitting the D2D discovery response frame to the STA2, and indicates the allocated transmission resource in the second MAP information sent to the STA 2. For the transmission resource allocated by the AP to the station STA2, reference may be made to the description in the fifth embodiment and fig. 17(b), which is not described herein again.

Step 610, the STA2 listens for the second MAP information sent by the AP for a second predetermined time.

In step 611, if the STA2 senses the second MAP information sent by the AP within the second preset time, the STA2 sends a D2D discovery response frame to the STA1 on the transmission resource indicated in the second MAP information.

Specifically, the frame structure of the D2D discovery response frame is shown in fig. 4, where the Category field indicates that the frame is a D2D discovery response, TA indicates address information of STA2, RA indicates address information of STA1, and the Capability field indicates that STA2 and STA1 negotiate link establishment in the subsequent D2D link establishment procedure.

If the STA2 does not hear the second MAP information sent by the AP within the second predetermined time, the STA2 re-executes step 607. If the retry exceeds a certain number of times and still does not sense the second MAP information sent by the AP, the STA2 abandons the random access procedure.

Step 612, STA1 listens for the second MAP information sent by the AP to STA2, and listens for the D2D discovery response frame sent by STA2 on the transmission resource indicated by the second MAP information.

Step 613, if STA1 detects the D2D discovery response frame sent by STA2, STA1 and STA2 complete the active discovery establishment.

If STA1 does not listen to the D2D discovery response frame sent by STA2, STA1 executes step 601 to resume the D2D discovery request procedure. If the retry exceeds a certain number of times and still does not receive the D2D request response sent by the STA2, the D2D active discovery procedure is abandoned.

The embodiment of the invention provides a random access method, wherein a station selects corresponding random access resources according to the type of data to be transmitted, so that an access point determines whether a data packet with a fixed data packet length needs to be transmitted by the station or a data packet with a non-fixed data packet length needs to be transmitted according to the random access resources selected by the station, and then allocates the corresponding transmission resources to the station, so that the station transmits the data to be transmitted on the allocated transmission resources.

EXAMPLE seven

An embodiment of the present invention provides a station, as shown in fig. 20, including:

an obtaining unit 2001, configured to obtain a random access resource allocated by an access point;

a sending unit 2002, configured to send a random access request to the access point on the random access resource, where the random access request includes a type field of data to be sent by the station, and the type of the data to be sent includes a data packet with a fixed data packet length and a data packet with an unfixed data packet length;

a receiving unit 2003, configured to receive resource allocation information sent by the access point, where the resource allocation information includes a transmission resource identifier allocated by the access point to the station, and the transmission resource identifier corresponds to a type field in the random access request;

the sending unit 2002 is further configured to send the data to be sent on the transmission resource of the resource allocation information.

Optionally, the data packet with a fixed data packet length includes: a terminal-to-terminal D2D discovery request frame, a D2D discovery response frame, a D2D link establishment request frame, a D2D link establishment response frame;

Optionally, if the station is a first D2D station, the sending unit 2002 sends the data to be sent on the transmission resource of the resource allocation information specifically includes: the transmitting unit 2002 transmits a D2D discovery request frame on the transmission resource of the resource allocation information.

Optionally, as shown in fig. 21, the station further includes: a first listening unit 2004;

the first listening unit 2004 is configured to listen to first resource allocation information sent by the access point after the sending unit 2002 sends a D2D discovery request frame on a transmission resource of the resource allocation information, where the first resource allocation information includes a transmission resource identifier allocated by the access point to a second D2D station, and the transmission resource is used for the second D2D station to transmit a D2D discovery response frame;

the first listening unit 2004 is further configured to listen to a D2D discovery response frame sent by the second D2D station on the transmission resource of the first resource allocation information.

Optionally, if the station is a first D2D station, the sending unit 2002 sends the data to be sent on the transmission resource of the resource allocation information specifically includes: the transmitting unit 2002 transmits a D2D link setup request frame on the transmission resource of the resource allocation information.

Optionally, as shown in fig. 21, the station further includes: the second interception unit 2005;

the second listening unit 2005 is configured to listen to third resource allocation information sent by the access point after the sending unit 2002 sends a D2D link establishment request frame on a transmission resource of the resource allocation information, where the third resource allocation information includes a transmission resource identifier allocated by the access point for a second D2D station, and the transmission resource is used for the second D2D station to transmit a D2D link establishment response frame;

the second listening unit 2005 is further configured to listen to a D2D link establishment response frame sent by the second D2D station on the transmission resource of the third resource allocation information.

Optionally, as shown in fig. 22, if the station is a second D2D station, the station further includes: a third listening unit 2006;

the third listening unit 2006, configured to listen to second resource allocation information sent by the access point before the obtaining unit 2001 obtains a random access resource allocated by the access point, where the second resource allocation information includes a transmission resource identifier allocated by the access point for a first D2D station, and the transmission resource is used for the first D2D station to transmit a D2D discovery request frame;

the third listening unit 2006 is further configured to listen to a D2D discovery request frame sent by the first D2D station on the transmission resource of the second resource allocation information.

Optionally, the sending unit 2002 sends the data to be sent on the transmission resource of the resource allocation information specifically includes: the transmitting unit 2002 transmits a D2D discovery response frame on the transmission resource of the resource allocation information.

Optionally, as shown in fig. 22, if the station is a second D2D station, the station further includes: a fourth listening unit 2007;

the fourth listening unit 2007 is configured to listen to fourth resource allocation information sent by the access point before the obtaining unit 2001 obtains a random access resource allocated by the access point, where the fourth resource allocation information includes a transmission resource identifier allocated by the access point for a first D2D station, and the transmission resource is used for the first D2D station to transmit a D2D link establishment request frame;

the fourth listening unit 2007 is further configured to listen to a D2D link establishment request frame sent by the first D2D station on the transmission resource of the fourth resource allocation information.

Optionally, the sending unit 2002 sends the data to be sent on the transmission resource of the resource allocation information specifically includes: the transmitting unit 2002 transmits a D2D link setup response frame on the transmission resource of the resource allocation information.

The embodiment of the invention provides a station, which enables an access point to determine whether a data packet with a fixed data packet length needs to be transmitted by the station or a data packet with a non-fixed data packet length is transmitted according to the type field of the data to be transmitted by the access point by carrying the type field of the data to be transmitted in a random access request, and then allocates corresponding transmission resources to the station, so that the station can transmit the data to be transmitted on the allocated transmission resources.

Example eight

An embodiment of the present invention provides a station, as shown in fig. 23, including:

an obtaining unit 2301, configured to obtain a random access resource allocated by an access point, where the random access resource includes a random access resource for performing random access on a data packet with a fixed data packet length and a random access resource for performing random access on a data packet with an unfixed data packet length;

a sending unit 2302, configured to select, according to a type of data to be sent, to send a random access request on a corresponding random access resource, where the type of the data packet to be sent includes a data packet with a fixed data packet length and a data packet with an unfixed data packet length;

a receiving unit 2303, configured to receive resource allocation information sent by the access point, where the resource allocation information includes a transmission resource identifier allocated by the access point to the station, and the transmission resource identifier corresponds to the selected random access resource;

the sending unit 2302 is further configured to send the data to be sent on the transmission resource of the resource allocation information.

Optionally, if the station is a first D2D station, the sending unit 2302 specifically includes, for sending the data to be sent on the transmission resource of the resource allocation information: the transmitting unit 2302 transmits a D2D discovery request frame on a transmission resource of the resource allocation information.

Optionally, as shown in fig. 24, the station further includes: first listening unit 2304;

the first listening unit 2304, configured to listen to first resource allocation information sent by the access point after the sending unit 2302 sends a D2D discovery request frame on the transmission resource of the resource allocation information, where the first resource allocation information includes a transmission resource identifier allocated by the access point for a second D2D station, and the transmission resource is used for the second D2D station to transmit a D2D discovery response frame;

the first listening unit 2304 is further configured to listen to a D2D discovery response frame sent by the second D2D station on the transmission resource of the first resource allocation information.

Optionally, if the station is a first D2D station, the sending unit 2302 specifically includes, for sending the data to be sent on the transmission resource of the resource allocation information: the transmitting unit 2302 transmits a D2D link setup request frame on a transmission resource of the resource allocation information.

Optionally, as shown in fig. 24, the method further includes: a second listening unit 2305;

the second listening unit 2305, configured to listen for third resource allocation information sent by the access point after the sending unit 2302 sends a D2D link establishment request frame on the transmission resource of the resource allocation information, where the third resource allocation information includes a transmission resource identifier allocated by the access point for a second D2D station, and the transmission resource is used for the second D2D station to transmit a D2D link establishment response frame;

the second listening unit 2305 is further configured to listen to a D2D link establishment response frame sent by the second D2D station on the transmission resource of the third resource allocation information.

Optionally, as shown in fig. 25, if the station is a second D2D station, the station further includes: third listening unit 2306;

the third listening unit 2306 is configured to listen to second resource allocation information sent by an access point before the acquiring unit 2301 acquires a random access resource allocated by the access point, where the second resource allocation information includes a transmission resource identifier allocated by the access point for a first D2D station, and the transmission resource is used for the first D2D station to transmit a D2D discovery request frame;

the third listening unit 2306 is further configured to listen to a D2D discovery request frame sent by the first D2D station on the transmission resource of the second resource allocation information.

Optionally, the sending unit 2302 sends the data to be sent on the transmission resource of the resource allocation information specifically includes: the transmitting unit 2302 transmits a D2D discovery response frame on a transmission resource of the resource allocation information.

Optionally, as shown in fig. 25, if the station is a second D2D station, the station further includes: fourth listening unit 2307;

the fourth listening unit 2307, configured to listen to fourth resource allocation information sent by an access point before the acquiring unit 2301 acquires a random access resource allocated by the access point, where the fourth resource allocation information includes a transmission resource identifier allocated by the access point for a first D2D station, and the transmission resource is used for the first D2D station to transmit a D2D link establishment request frame;

the fourth listening unit 2307 is further configured to listen for a D2D link establishment request frame sent by the first D2D station on the transmission resource of the fourth resource allocation information.

Optionally, the sending unit 2302 sends the data to be sent on the transmission resource of the resource allocation information specifically includes: the transmitting unit 2302 transmits a D2D link setup response frame on the transmission resources of the resource allocation information.

The embodiment of the invention provides a station, which selects corresponding random access resources according to the type of data to be transmitted, so that an access point determines whether a data packet with a fixed data packet length needs to be transmitted by the station or a data packet with a non-fixed data packet length needs to be transmitted according to the random access resources selected by the station, and then allocates corresponding transmission resources to the station, so that the station can transmit the data to be transmitted on the allocated transmission resources.

Example nine

An embodiment of the present invention provides an access point, as shown in fig. 26, including:

an allocating unit 2601, configured to allocate a random access resource to a station by an access point;

a receiving unit 2602, configured to receive a random access request sent by the station on the random access resource, where the random access request includes a type field of data to be sent by the station, and the type of the data to be sent includes a data packet with a fixed data packet length and a data packet with an unfixed data packet length;

a sending unit 2603, configured to send resource allocation information to the station, where the resource allocation information includes a transmission resource identifier allocated by the access point to the station, and the transmission resource identifier corresponds to a type field in the random access request;

the receiving unit 2602 is further configured to receive data to be sent, which is sent by the station on the transmission resource of the resource allocation information.

The embodiment of the invention provides an access point, which determines whether a data packet to be transmitted by a station is a data packet with a fixed length or a data packet with an unfixed length according to a type field of data to be transmitted in a random access request sent by the station, and then allocates corresponding transmission resources to the station, so that the station can send the data to be transmitted on the allocated transmission resources.

Example ten

An embodiment of the present invention provides an access point, as shown in fig. 27, including:

an allocating unit 2701, configured to allocate random access resources to a station, where the random access resources include a random access resource for performing random access on a data packet with a fixed data packet length and a random access resource for performing random access on a data packet with an unfixed data packet length;

a receiving unit 2702, configured to receive a random access request sent by the station on a corresponding random access resource according to a type of a to-be-sent data packet, where the type of the to-be-sent data packet includes a data packet with a fixed data packet length and a data packet with an unfixed data packet length;

a sending unit 2703, configured to send resource allocation information to the station, where the resource allocation information includes a transmission resource identifier allocated by the access point to the station, and the transmission resource identifier corresponds to a random access resource selected by the station;

the receiving unit 2702 is further configured to receive data to be sent, which is sent by the station on the transmission resource of the resource allocation information.

The embodiment of the invention provides an access point, which determines whether a data packet to be transmitted by a station is a data packet with a fixed length or a data packet with an unfixed length according to a random access resource selected by the station when sending a random access request, and further allocates corresponding transmission resources for the station, so that the station can send data to be sent on the allocated transmission resources.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be physically included alone, or two or more units may be integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A random access method, comprising:

a station acquires random access resources distributed by an access point;

transmitting the data to be transmitted on the transmission resources of the resource allocation information;

if the station is the second D2D station, before the acquiring the random access resource allocated by the access point, the method further includes:

2. The method of claim 1, wherein the fixed-length packet comprises: a terminal-to-terminal D2D discovery request frame, a D2D discovery response frame, a D2D link establishment request frame, a D2D link establishment response frame;

3. The method according to claim 1 or 2, wherein if the station is a first D2D station, the sending the data to be sent on the transmission resource of the resource allocation information specifically includes: the first D2D station transmits a D2D discovery request frame on the transmission resources of the resource allocation information.

4. The method of claim 3, wherein after the first D2D station sends a D2D discovery request frame on the transmission resources of the resource allocation information, the method further comprises:

5. The method according to claim 1 or 2, wherein if the station is a first D2D station, the sending the data to be sent on the transmission resource of the resource allocation information specifically includes: the first D2D station transmitting a D2D link establishment request frame on the transmission resources of the resource allocation information.

6. The method of claim 5, wherein after the first D2D station sends a D2D link establishment request frame on the transmission resources of the resource allocation information, the method further comprises:

7. The method according to claim 1, wherein the sending the data to be sent on the transmission resources of the resource allocation information specifically includes: the second D2D station transmitting a D2D discovery response frame on the transmission resources of the resource allocation information.

8. The method according to claim 1 or 2, wherein before the acquiring the random access resource allocated by the access point, if the station is a second D2D station, the method further comprises:

9. The method according to claim 8, wherein the sending the data to be sent on the transmission resources of the resource allocation information specifically includes: the second D2D station transmitting a D2D link establishment response frame on the transmission resources of the resource allocation information.

10. A random access method, comprising:

11. The method of claim 10, wherein the fixed-length packet comprises: a terminal-to-terminal D2D discovery request frame, a D2D discovery response frame, a D2D link establishment request frame, a D2D link establishment response frame;

12. The method according to claim 10 or 11, wherein if the station is a first D2D station, the sending the data to be sent on the transmission resource of the resource allocation information specifically includes: the first D2D station transmits a D2D discovery request frame on the transmission resources of the resource allocation information.

13. The method of claim 12, wherein after the first D2D station sends a D2D discovery request frame on the transmission resources of the resource allocation information, the method further comprising:

14. The method according to claim 10 or 11, wherein if the station is a first D2D station, the sending the data to be sent on the transmission resource of the resource allocation information specifically includes: the first D2D station transmitting a D2D link establishment request frame on the transmission resources of the resource allocation information.

15. The method of claim 14, wherein after the first D2D station sends a D2D link establishment request frame on the transmission resources of the resource allocation information, the method further comprises:

16. The method according to claim 10, wherein the sending the data to be sent on the transmission resources of the resource allocation information specifically includes: the second D2D station transmitting a D2D discovery response frame on the transmission resources of the resource allocation information.

17. The method according to claim 10 or 11, wherein before the acquiring the random access resource allocated by the access point, if the station is a second D2D station, the method further comprises:

18. The method of claim 17, wherein the sending the data to be sent on the transmission resources of the resource allocation information specifically comprises: the second D2D station transmitting a D2D link establishment response frame on the transmission resources of the resource allocation information.

19. A random access method, comprising:

the access point distributes random access resources to the stations;

receiving data to be sent by the station on the transmission resources of the resource allocation information;

if the station is a second D2D station, before the second D2D station acquires the random access resource allocated by the access point, the method further includes:

20. The method of claim 19, wherein the fixed-length packet comprises: a terminal-to-terminal D2D discovery request frame, a D2D discovery response frame, a D2D link establishment request frame, a D2D link establishment response frame;

21. A random access method, comprising:

22. The method of claim 21, wherein the fixed-length packet comprises: a terminal-to-terminal D2D discovery request frame, a D2D discovery response frame, a D2D link establishment request frame, a D2D link establishment response frame;

23. A station, comprising:

the sending unit is further configured to send the data to be sent on the transmission resources of the resource allocation information;

if the station is a second D2D station, the station further includes: a third listening unit;

24. The station of claim 23, wherein the fixed-length packet comprises: a terminal-to-terminal D2D discovery request frame, a D2D discovery response frame, a D2D link establishment request frame, a D2D link establishment response frame;

25. The station according to claim 23 or 24, wherein if the station is a first D2D station, the sending, by the sending unit, the sending the data to be sent on the transmission resource of the resource allocation information specifically includes: the transmitting unit transmits a D2D discovery request frame on a transmission resource of the resource allocation information.

26. The station of claim 25, further comprising: a first listening unit;

27. The station according to claim 23 or 24, wherein if the station is a first D2D station, the sending, by the sending unit, the sending the data to be sent on the transmission resource of the resource allocation information specifically includes: the transmitting unit transmits a D2D link setup request frame on a transmission resource of the resource allocation information.

28. The station of claim 27, further comprising: a second listening unit;

29. The station of claim 23, wherein the sending unit sending the data to be sent on the transmission resource of the resource allocation information specifically includes: the transmitting unit transmits a D2D discovery response frame on a transmission resource of the resource allocation information.

30. The station according to claim 23 or 24, wherein if the station is a second D2D station, the station further comprises: a fourth listening unit;

the fourth listening unit is configured to listen to fourth resource allocation information sent by an access point before the obtaining unit obtains a random access resource allocated by the access point, where the fourth resource allocation information includes a transmission resource identifier allocated by the access point for a first D2D station, and the transmission resource is used for the first D2D station to transmit a D2D link establishment request frame;

31. The station of claim 30, wherein the sending unit sending the data to be sent on the transmission resource of the resource allocation information specifically includes: the transmitting unit transmits a D2D link setup response frame on the transmission resource of the resource allocation information.

32. A station, comprising:

the station further comprises: a third listening unit;

the third listening unit is configured to listen to second resource allocation information sent by the access point before the obtaining unit obtains a random access resource allocated by the access point if the station is a second D2D station, where the second resource allocation information includes a transmission resource identifier allocated by the access point for a first D2D station, and the transmission resource is used for the first D2D station to transmit a D2D discovery request frame;

33. The station of claim 32, wherein the fixed-length packet comprises: a terminal-to-terminal D2D discovery request frame, a D2D discovery response frame, a D2D link establishment request frame, a D2D link establishment response frame;

34. The station according to claim 32 or 33, wherein if the station is a first D2D station, the sending, by the sending unit, the sending the data to be sent on the transmission resource of the resource allocation information specifically includes: the transmitting unit transmits a D2D discovery request frame on a transmission resource of the resource allocation information.

35. The station of claim 34, further comprising: a first listening unit;

36. The station according to claim 32 or 33, wherein if the station is a first D2D station, the sending, by the sending unit, the sending the data to be sent on the transmission resource of the resource allocation information specifically includes: the transmitting unit transmits a D2D link setup request frame on a transmission resource of the resource allocation information.

37. The station of claim 36, further comprising: a second listening unit;

38. The station of claim 32, wherein the sending unit sending the data to be sent on the transmission resource of the resource allocation information specifically includes: the transmitting unit transmits a D2D discovery response frame on a transmission resource of the resource allocation information.

39. A station as claimed in claim 32 or 33, characterized in that the station further comprises: a fourth listening unit;

the fourth listening unit is configured to listen to fourth resource allocation information sent by the access point before the obtaining unit obtains a random access resource allocated by the access point if the station is a second D2D station, where the fourth resource allocation information includes a transmission resource identifier allocated by the access point for a first D2D station, and the transmission resource is used for the first D2D station to transmit a D2D link establishment request frame;

40. The station of claim 39, wherein the sending unit sending the data to be sent on the transmission resource of the resource allocation information specifically includes: the transmitting unit transmits a D2D link setup response frame on the transmission resource of the resource allocation information.

41. An access point, comprising:

the receiving unit is further configured to receive data to be sent, which is sent by the station on the transmission resource of the resource allocation information;

if the station is a second D2D station, before the second D2D station obtains the random access resource allocated by the access point, the second D2D station listens to second resource allocation information sent by the access point, where the second resource allocation information includes a transmission resource identifier allocated by the access point for the first D2D station, and the transmission resource is used for the first D2D station to transmit a D2D discovery request frame; and listening for a D2D discovery request frame sent by the first D2D station on the transmission resources of the second resource allocation information.

42. The access point of claim 41, wherein the fixed-length packet comprises: a terminal-to-terminal D2D discovery request frame, a D2D discovery response frame, a D2D link establishment request frame, a D2D link establishment response frame;

43. An access point, comprising:

44. The access point of claim 43, wherein the fixed-length packet comprises: a terminal-to-terminal D2D discovery request frame, a D2D discovery response frame, a D2D link establishment request frame, a D2D link establishment response frame;