WO2013181804A1

WO2013181804A1 - Uplink access method, device and system

Info

Publication number: WO2013181804A1
Application number: PCT/CN2012/076514
Authority: WO
Inventors: 张晓风; 石操
Original assignee: 华为技术有限公司
Priority date: 2012-06-06
Filing date: 2012-06-06
Publication date: 2013-12-12
Also published as: CN102907154A; CN102907154B

Abstract

Embodiments of the present invention provide an uplink access method, device and system. The uplink access method comprises: setting reservation resources and sending reservation resource notification information to at least one terminal; receiving reservation signals sent by at least one terminal via the reservation resources separately; and sending an uplink access resource allocation message to the at least one terminal according to the reservation signals separately, so that the at least one terminal performs uplink access by means of uplink access resources corresponding to the access resource allocation message. According to the uplink access method, device and system of the embodiments of the present invention, a head-end device allocates the reservation resources at first and then allocates the uplink access resources to the terminal only after receiving the reservation signals sent by the terminal, thereby preventing unnecessary resource waste which may be caused by that many uplink access resources are always kept for uplink detection.

Description

Uplink access method, device and system

The present invention relates to communications technologies, and in particular, to an uplink access method, device, and system. Background technique

The Orthogonal Frequency Division Multiple Access (OFDMA) system is based on multiple access technology, and divides the transmission bandwidth into orthogonal sets of subcarriers that do not overlap each other, and allocates different subcarrier sets to Different users implement multiple access. The OFDM system can dynamically allocate available bandwidth resources to users in need, and it is easy to optimize the utilization of system resources. Since different users occupy sub-carrier sets that do not overlap each other, in the ideal synchronization situation, the system has no multi-room interference.

At present, the uplink access of the OFDMA system is mainly to allocate a fixed time-frequency block as the uplink orthogonal sequence. The length of the uplink sequence cannot be too short. In this case, more resources are needed to carry the orthogonal sequence. However, in a wired system, since the relative relationship between the terminal and the head device is stable, a large number of uplink access resources are always used for uplink access, which inevitably causes unnecessary waste of resources. SUMMARY OF THE INVENTION Embodiments of the present invention provide an uplink access method, device, and system to avoid waste of uplink resources.

An embodiment of the present invention provides an uplink access method, including:

Setting a reservation resource, and sending the reservation resource notification information to the at least one terminal, where the reservation resource notification information is used to indicate a time location of the reserved resource;

Receiving, by the at least one terminal, a reservation signal that is sent by using the reserved resource, respectively, sending an uplink access resource allocation message to the at least one terminal according to the reservation signal, so that the at least one terminal passes the access resource The uplink access resource corresponding to the message is allocated for uplink access.

An embodiment of the present invention provides an uplink access method, including: Obtaining, according to the identified reserved resource notification information, a time position of the reserved resource, and transmitting, by using the reserved resource, a reservation signal to the head end device;

Receiving an uplink access resource allocation message sent by the head end device, and performing uplink access by using an uplink access resource corresponding to the access resource allocation message.

An embodiment of the present invention provides a head end device, including:

a first allocation unit, configured to receive a reservation resource, and send the reservation resource notification information to the at least one terminal, where the reservation resource notification information is used to indicate a time location of the reserved resource; and a reservation unit, configured to receive the at least one a reservation signal sent by the terminal through the reserved resource respectively;

a second allocation unit, configured to send an uplink access resource allocation message to the at least one terminal according to the reservation signal, so that the at least one terminal performs uplink by using an uplink access resource corresponding to the access resource allocation message Access.

An embodiment of the present invention provides a terminal, including:

a reservation signal sending unit, configured to learn, according to the identified reserved resource notification information, a time position of the reserved resource, and send a reservation signal to the head end device by using the reserved resource;

And an uplink access unit, configured to receive an uplink access resource allocation message sent by the head end device, and perform uplink access by using an uplink access resource corresponding to the access resource allocation message.

An embodiment of the present invention provides an uplink access system, including:

The head end device provided by the embodiment of the present invention, and the terminal provided by the embodiment of the present invention. According to the foregoing technical solution, the present invention provides an uplink access method, device, and system provided by the embodiment. The head end device sets a reservation resource, sends a reservation resource notification information to at least one terminal, and receives an appointment that at least one terminal separately sends through the reserved resource. The signal is allocated to the at least one row access resource according to the reservation signal sent by the terminal, so that the at least one terminal accesses the uplink access resource corresponding to the access resource allocation message. The head-end device allocates the reserved resource first, and after receiving the reservation signal sent by the terminal, allocates the uplink access resource to the terminal, thereby avoiding unnecessary resource waste caused by the uplink access resource being maintained for uplink detection. . In the wired system, the relative relationship between the terminal and the headend device is relatively stable. The uplink access method provided in this embodiment can effectively save uplink access resources, thereby improving the data throughput of the entire system. DRAWINGS In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

FIG. 1 is a flowchart of an uplink access method according to an embodiment of the present invention;

2 is a flowchart of another uplink access method according to an embodiment of the present invention;

FIG. 3 is a flowchart of still another uplink access method according to an embodiment of the present disclosure;

4 is a schematic structural diagram of a head end device according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of another head end device according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of a terminal according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of an uplink access system according to an embodiment of the present invention. The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. The embodiments are a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

FIG. 1 is a flowchart of an uplink access method according to an embodiment of the present invention. As shown in FIG. 1 , the uplink access method provided in this embodiment may be specifically applied to an OFDMA system for detecting an uplink access user, where the OFDMA system may be a point-to-multipoint system, that is, the system includes a head end. Equipment and multiple terminal devices. The uplink access method provided in this embodiment can be performed by a head end device.

The uplink access method provided in this embodiment specifically includes:

Step S10: Set a reservation resource, and send a reservation resource notification information to at least one terminal, where the reservation resource notification information is used to indicate a time position of the reserved resource;

Step S20: Receive a reservation request message S30 sent by the at least one terminal by using the reserved resource, and send an uplink access resource allocation message to the at least one terminal according to the reservation signal, so that the at least one terminal passes The uplink corresponding to the access resource allocation message Access resources for uplink access.

The head end device may be a central office device, and the head end device first sets a reserved resource, and the reserved resource may be a time-frequency block or a time slot. The head end device then delivers the reserved resource notification information for indicating the time position of the reserved resource, so that the terminal that needs to go online can recognize the reserved resource notification information and know the time position of the reserved resource. In the actual application process, the head end device does not know which terminals need to go online, and in the process of issuing the reservation resource notification information, the head end device may broadcast the reservation resource notification information in a broadcast manner, or may be in the downlink data. The reservation resource notification information is carried in, and the terminal that needs to go online can recognize the reservation resource notification information. The terminal that needs to go online, after identifying the reserved resource, sends a reservation signal through the reserved resource. When multiple terminals are online, the multiple terminals can use the reserved resource to send a reservation signal, and the reservation signal may specifically include an orthogonal In the sequence, the orthogonal sequences in the reservation signals transmitted by different terminals may be the same. The head end device sends an uplink access resource allocation message to the terminal that sends the reservation signal, and the terminal accesses the uplink access resource corresponding to the uplink access resource allocation message.

In the uplink access method provided by the embodiment, the head end device sets the reserved resource, sends the reserved resource notification information, receives the reservation signal sent by the at least one terminal through the reserved resource, and sends the uplink access resource allocation to the at least one terminal according to the reserved signal. The message is such that the at least one terminal accesses the uplink access resource corresponding to the access resource allocation message. The head-end device allocates the reserved resource first, and after receiving the reservation signal sent by the terminal, allocates the uplink access resource to the terminal, thereby avoiding unnecessary resource waste caused by the uplink access resource being maintained for uplink detection. . In the wired system, the relative relationship between the terminal and the headend device is relatively stable. The uplink access method provided in this embodiment can effectively save uplink access resources, thereby improving the data throughput of the entire system.

FIG. 2 is a flowchart of another uplink access method according to an embodiment of the present invention. As shown in FIG. 2, in the embodiment, the setting the reservation resource in step S10 may specifically include the following steps:

Periodically setting the reserved resource;

Correspondingly, in step S20, after receiving the reservation signal sent by the at least one terminal by using the reserved resource, the method may further include the following steps:

Step S40: Decrease the setting period of the reserved resource according to the reservation signal.

Specifically, the reserved resource is periodically set, and resource waste can be further avoided. Head When the terminal device receives the reservation signal, it can be known that the user needs to go online, and the setting period of the reserved resource can be reduced to meet the user's online demand.

It is also possible to determine the user's online status in the time period according to the online statistical information. When the reservation signal sent by the receiving terminal is too dense, that is, the time when the user goes online, the setting period of the reserved resource can be reduced. In this embodiment, in step S40, the setting period of the reserved resource is reduced according to the reservation signal, which may specifically include the following steps:

During the first preset time, if the number of the received reservation signals exceeds a preset threshold, the set period of the reserved resources is decreased.

In the actual application process, the setting period of the reserved resource may also be adjusted according to the number of users who have gone online. For example, in a wired system, since the number of terminals is relatively stable, when the number of terminals that have been online reaches a certain number, the number of terminals that may need to go online is not much, and when the number of terminals that have gone online exceeds a certain value, even if there is a new online connection, The terminal does not need to reduce the setting period; if the setting period has been previously reduced, then the setting period can be appropriately increased. By adjusting the set period of the reserved resources, the adaptability of the user's needs can be improved.

Further, in this embodiment, after the setting period of the reserved resource is reduced, the step S40 may further include the following steps:

Step S50: If the reservation signal sent by the other terminal through the reserved resource is not received within the second preset time, the setting period of the reserved resource is restored to an initial value.

After the setting period of the reserved resource is reduced, if the reservation signal sent by the other terminal is not received within the second preset time, the setting period of the reserved resource may be restored to the initial value to avoid waste of the reserved resource.

In this embodiment, the sending the uplink access resource allocation message to the at least one terminal according to the reservation signal may specifically include the following steps:

Performing correlation processing according to the first orthogonal sequence in the reserved signal, and if the generated first correlation peak exceeds the first preset value, broadcasting the uplink access resource allocation message.

Specifically, the first orthogonal sequence used by the different terminals to reserve the uplink may be the same, so that the head end device knows that the terminal needs to go online. The first orthogonal sequence may specifically be a pseudo random noise (abbreviated as ΡΝ) having orthogonality. The terminal carries the first orthogonal sequence in the reservation signal, and sends the reserved resource to the head end device. The head end device correlates the local orthogonal sequence with the first orthogonal sequence, and if the generated first correlation peak exceeds the first preset value, There is a terminal that needs to go online. The uplink access resource allocation message is broadcast to all terminals. The terminal learns the uplink access resource allocation message according to the broadcast, and accesses the uplink access resource corresponding to the uplink access resource allocation message. Setting the first orthogonal sequence to a short sequence can achieve online reservation and save resources.

Further, in this embodiment, in step S30, after the uplink access resource allocation message is sent to the at least one terminal according to the reservation signal, the method may further include the following steps:

Step S60: Receive a second orthogonal sequence that is sent by the at least one terminal by using an uplink access resource corresponding to the uplink access resource allocation message, and perform correlation processing according to each second orthogonal sequence, if the second generated If the correlation peak exceeds the second preset value, the identifier of the second orthogonal sequence is determined, and the identifier is carried in the access response and sent.

The terminal may randomly select a second orthogonal sequence from the second set of orthogonal sequences, the second orthogonal sequence having an identifier for uniquely identifying the second orthogonal sequence. The second orthogonal sequence set includes a plurality of second orthogonal sequences, each having orthogonality between the second orthogonal sequences. The terminal sends the selected second orthogonal sequence to the head end device. The head end device performs correlation processing on the second orthogonal sequence according to the local orthogonal sequence set, where the local orthogonal sequence set includes multiple orthogonal sequences, and each orthogonal sequence in the local orthogonal sequence set is associated with the Correlating the second orthogonal sequence, if a second correlation peak generated by one of the orthogonal sequences and the second orthogonal sequence exceeds a second preset value, a sequence may be detected, and the second and the second The orthogonal sequence related orthogonal sequence determines the identifier of the second orthogonal sequence, and carries the identifier in the access response and sends the identifier to the terminal. Specifically, the head end device may not need to know which terminal to send the second orthogonal sequence, and only needs to send the access response, and the terminal identifies the identifier of the second orthogonal sequence that is sent by the identifier in the access response. When it is determined that the access response is sent to itself, the access response is valid for the terminal. The terminal is distinguished by the second orthogonal sequence, which is simple to implement.

In an actual application, there is another uplink access mode, and the head end device periodically allocates uplink access resources, and the terminal that needs to go online randomly obtains orthogonal allocation after identifying the allocation of the uplink access resources of the head end. An orthogonal sequence is selected in the sequence set, the orthogonal sequence has an identifier, and the orthogonal sequence is sent to the head end device, and the head end device performs correlation processing on the orthogonal sequence, if the generated correlation peak exceeds a preset value, If the terminal that needs to go online is determined, the setup period of the uplink access resource is shortened, so that more uplink access resources are guaranteed. The head end device determines the identity of the orthogonal sequence, and carries the identifier in the access response for transmission. The terminal recognizes that the identifier in the access response is orthogonal to itself. When the sequence is identified, it can be determined that the access response is sent to itself, and the access response is valid for the terminal. In the foregoing process, after the preset sequence of the uplink access resource is shortened, and no other terminal sends the orthogonal sequence, the setting period of the uplink access resource is restored to the initial value to save resources. purpose.

FIG. 3 is a flowchart of still another uplink access method according to an embodiment of the present invention. As shown in FIG. 3, the uplink access method provided in this embodiment may be implemented in conjunction with the uplink access method applied to the head end device according to any embodiment of the present invention, and the specific implementation process is not described herein. The uplink access method provided in this embodiment can be performed by the terminal.

The uplink access method provided in this embodiment specifically includes:

Step C10: Obtain a time position of the reserved resource according to the identified reserved resource notification information, and send a reservation signal to the head end device by using the reserved resource;

Step C20: Receive an uplink access resource allocation message sent by the head end device, and perform uplink access by using an uplink access resource corresponding to the access resource allocation message.

In the uplink access method provided by the embodiment, the terminal obtains the time position of the reserved resource according to the identified reserved resource notification information, and sends a reservation signal to the head end device by using the reserved resource, and receives an uplink access resource allocation message sent by the head end device. Accessing the uplink access resource corresponding to the access resource allocation message. The head-end device allocates the reserved resource first, and after receiving the reservation signal sent by the terminal, allocates the uplink access resource to the terminal, thereby avoiding unnecessary resource waste caused by the uplink access resource being maintained for uplink detection. . Especially in the wired system, the relative relationship between the terminal and the head end device is relatively stable. The uplink access method provided in this embodiment can effectively save the uplink access resources, thereby improving the data throughput of the entire system.

In this embodiment, in step C10, the sending the reservation signal to the head end device by using the reserved resource may specifically include the following steps:

And if the reserved resource that is periodically set, the first orthogonal sequence is carried in the reservation signal, and the reservation signal is sent to the head end device by using the reserved resource;

Correspondingly, in step C20, the receiving the uplink access resource allocation message sent by the head end device, and performing uplink access by using the uplink access resource corresponding to the access resource allocation message, may specifically include the following steps:

Receiving a broadcast that is sent by the head end device and carrying the uplink access resource allocation message, and performing uplink access by using an uplink access resource corresponding to the access resource allocation message. The head end device realizes the online reservation by the first orthogonal sequence, and sets the first orthogonal sequence to the short sequence to realize the online reservation, thereby saving resources.

In this embodiment, the performing the uplink access by using the uplink access resource corresponding to the access resource allocation message in step C20 may specifically include the following steps:

Selecting a second orthogonal sequence from the second orthogonal sequence set, sending the second orthogonal sequence to the head end device by using an uplink access resource corresponding to the access resource allocation message, and receiving the header The access response is sent by the end device, and if the identifier in the access response is the same as the identifier of the second orthogonal sequence sent to the head device, the uplink access is completed.

The head end device distinguishes the terminal by using the second orthogonal sequence to implement uplink access to the terminal, which is simple to implement.

FIG. 4 is a schematic structural diagram of a head end device according to an embodiment of the present invention. As shown in FIG. 4, the head end device 81 provided in this embodiment may implement various steps of the uplink access method applied to the head end device 81 according to any embodiment of the present invention, and details are not described herein again. The head end device 81 provided in this embodiment specifically includes a first distribution unit 11, a reservation unit 12, and a second distribution unit 13. The first allocation unit 11 is configured to set a reservation resource, and send the reservation resource notification information to the at least one terminal, where the reservation resource notification information is used to indicate the time position of the reserved resource. The reservation unit 12 is configured to receive a reservation signal that is sent by the at least one terminal 82 through the reserved resource. The second allocation unit 13 is configured to send an uplink access resource allocation message to the at least one terminal 82 according to the reservation signal, so that the at least one terminal 82 passes the uplink access resource corresponding to the access resource allocation message. Perform uplink access.

In the head end device 81 provided by this embodiment, the first allocating unit 11 sets a reserved resource, and sends a reserved resource notification information. The reservation unit 12 receives a reservation signal that is transmitted by at least one terminal 82 through a reserved resource, and the second allocating unit 13 according to the reservation signal. The uplink access resource allocation message is sent to the at least one terminal 82, so that the at least one terminal 82 accesses the uplink access resource corresponding to the access resource allocation message. The head end device 81 first allocates the reserved resource, and after receiving the reservation signal sent by the terminal 82, allocates the uplink access resource to the terminal 82, thereby avoiding unnecessary unnecessary uplink access resources for uplink detection. Waste of resources. In the wired system, the relative relationship between the terminal 82 and the head end device 81 is relatively stable. The uplink access method provided in this embodiment can effectively save uplink access resources, thereby improving the data throughput of the entire system.

FIG. 5 is a schematic structural diagram of another head end device according to an embodiment of the present invention. As shown in Figure 5, In this embodiment, the first allocating unit 11 is further configured to periodically set the reserved resource. Correspondingly, the head end device 81 may further include a setting period adjusting unit 14. The setting period adjusting unit 14 is configured to reduce the setting period of the reserved resource according to the reservation signal. By setting the setting of the period adjusting unit 14, the setting period of the reserved resource is adjusted, and the adaptability of the user's demand can be improved.

In this embodiment, the setting period adjusting unit 14 is further configured to: if the number of the received reservation signals exceeds a preset threshold in a first preset time, reduce a setting period of the reserved resource. . When the reservation signal sent by the receiving terminal is too dense, that is, the time when the user goes online, the setting period of the reserved resource can be reduced.

In this embodiment, the head end device 81 may further include a reset unit 15. Reset unit

15 is configured to restore the set period of the reserved resource to an initial value if the reservation signal sent by the other terminal 82 through the reserved resource is not received within the second preset time. After the setting period of the reserved resource is reduced, if the reservation signal sent by the other terminal 82 is not received within the preset time, the setting period of the reserved resource may be restored to the initial value to avoid waste of the reserved resource.

In this embodiment, the reservation signal includes a first orthogonal sequence. Correspondingly, the second allocation unit 13 is further configured to perform correlation processing according to the first orthogonal sequence in the reservation signal, and if the generated first correlation peak exceeds a first preset value, the uplink access is performed. The resource allocation message is broadcast. Setting the first orthogonal sequence to a short sequence can achieve online reservation and save resources.

In this embodiment, the head end device 81 may further include an access detecting unit 16. The access detecting unit 16 is configured to receive a second orthogonal sequence that is sent by the at least one terminal 82 by using an uplink access resource corresponding to the uplink access resource allocation message, and perform related processing according to each second orthogonal sequence. And if the generated second correlation peak exceeds the second preset value, determining an identifier of the second orthogonal sequence, and carrying the identifier in the access response to send. The terminal 82 is distinguished by the second orthogonal sequence, which is simple to implement.

FIG. 6 is a schematic structural diagram of a terminal according to an embodiment of the present invention. As shown in FIG. 6 , the terminal 82 provided in this embodiment may implement various steps of the uplink access method applied to the terminal 82 according to any embodiment of the present disclosure, and details are not described herein. The terminal 82 provided in this embodiment specifically includes a reservation signal sending unit 21 and an uplink access unit 22. The reservation signal transmitting unit 21 is configured to learn the time position of the reserved resource according to the identified reserved resource notification information, and send the reservation signal to the head end device 81 through the reserved resource. The uplink access unit 22 is configured to receive the uplink access sent by the head end device 81. The resource allocation message is used for uplink access by using the uplink access resource corresponding to the access resource allocation message.

In the terminal 82 provided by the embodiment, the reservation signal sending unit 21 obtains the time position of the reserved resource according to the identified reserved resource notification information, and sends a reservation signal to the head end device 81 through the reserved resource, and the uplink access unit 22 receives the head end. The uplink access resource allocation message sent by the device 81 is accessed by accessing the uplink access resource corresponding to the resource allocation message. The head end device 81 first allocates the reserved resource periodically, and after receiving the reservation signal sent by the terminal 82, allocates the uplink access resource to the terminal 82, thereby avoiding that the uplink access resource is always maintained for uplink detection. Unnecessary waste of resources. In the wired system, the relative relationship between the terminal 82 and the head end device 81 is relatively stable. The uplink access method provided in this embodiment can effectively save uplink access resources, thereby improving the data throughput of the entire system.

In this embodiment, the reservation signal sending unit 21 is further configured to: if the reserved resource that is periodically set, identify the first orthogonal sequence, the first orthogonal sequence is carried in the reservation signal, and the reserved resource is used to the header. The end device 81 transmits the reservation signal. The uplink access unit 22 is further configured to receive, by the head end device 81, the uplink access resource allocation message, and perform uplink access by using the uplink access resource corresponding to the access resource allocation message.

In this embodiment, the uplink access unit 22 is further configured to select a second orthogonal sequence from the second orthogonal sequence set, and use the uplink access resource corresponding to the access resource allocation message to the header. The end device 81 sends the second orthogonal sequence, and receives the access response carrying the identifier sent by the head end device 81, if the identifier in the access response is sent to the head end device 81 If the identifiers of the two orthogonal sequences are the same, the uplink access is completed.

FIG. 7 is a schematic structural diagram of an uplink access system according to an embodiment of the present invention. As shown in FIG. 7, in the embodiment, the uplink access system specifically includes: a head end device 81 provided by any embodiment of the present invention, and a plurality of terminals 82 provided by any embodiment of the present invention.

A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. The method includes the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than The present invention has been described in detail with reference to the foregoing embodiments, and those skilled in the art should understand that the technical solutions described in the foregoing embodiments may be modified or equivalently substituted for some of the technical features. The modifications and substitutions do not depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

claims

1. An uplink access method, characterized by including:

Set reservation resources, and send reservation resource notification information to at least one terminal, wherein the reservation resource notification information is used to indicate the time location of the reservation resource;

Receive a reservation signal sent by the at least one terminal through the reservation resource respectively; send an uplink access resource allocation message to the at least one terminal according to the reservation signal, so that the at least one terminal can use the access resource Allocate uplink access resources corresponding to the message for uplink access.

2. The uplink access method according to claim 1, characterized in that the setting of reservation resources includes:

Periodically setting the reservation resource;

Correspondingly, after receiving the reservation signal sent by at least one terminal through the reservation resource, the method further includes:

The setting period of the reserved resource is reduced according to the reservation signal.

3. The uplink access method according to claim 2, characterized in that: reducing the setting period of the reservation resource according to the reservation signal includes:

Within the first preset time, if the number of the reservation signals received exceeds the preset threshold, the setting period of the reservation resource is reduced.

4. The uplink access method according to claim 2 or 3, characterized in that, after reducing the setting period of the reservation resource, it further includes:

Within the second preset time, if no reservation signal sent by other terminals through the reservation resource is received, the setting period of the reservation resource is restored to the initial value.

5. The uplink access method according to any one of claims 1-3, characterized in that: the reservation signal includes a first orthogonal sequence;

Correspondingly, sending an uplink access resource allocation message to the at least one terminal according to the reservation signal includes:

Correlation processing is performed according to the first orthogonal sequence in the reservation signal. If the generated first correlation peak exceeds the first preset value, the uplink access resource allocation message is broadcast.

6. The uplink access method according to any one of claims 1 to 5, characterized in that, after sending an uplink access resource allocation message to the at least one terminal according to the reservation signal, include:

Receive the second orthogonal sequence sent by the at least one terminal through the uplink access resource corresponding to the uplink access resource allocation message, and perform correlation processing according to each second orthogonal sequence. If the generated second correlation peak exceeds The second preset value is to determine the identifier of the second orthogonal sequence, and carry the identifier in the access response and send it.

7. An uplink access method, characterized by including:

Obtain the time location of the reservation resource according to the identified reservation resource notification information, and send a reservation signal to the head-end device through the reservation resource;

Receive the uplink access resource allocation message sent by the head-end device, and perform uplink access through the uplink access resource corresponding to the access resource allocation message.

8. The uplink access method according to claim 7, characterized in that:

The sending a reservation signal to the head-end device through the reservation resource includes:

If a periodically set reservation resource is identified, the first orthogonal sequence is carried in the reservation signal, and the reservation signal is sent to the head-end device through the reservation resource;

Accordingly, receiving the uplink access resource allocation message sent by the head-end device and performing uplink access through the uplink access resource corresponding to the access resource allocation message includes:

Receive the broadcast carrying the uplink access resource allocation message sent by the head-end device, and perform uplink access through the uplink access resource corresponding to the access resource allocation message.

9. The uplink access method according to claim 7 or 8, characterized in that the uplink access is performed through the uplink access resources corresponding to the access resource allocation message, including:

Select a second orthogonal sequence from the second orthogonal sequence set, send the second orthogonal sequence to the head-end device through the uplink access resource corresponding to the access resource allocation message, and receive the header The end device sends an access response carrying an identifier. If the identifier in the access response is the same as the identifier of the second orthogonal sequence sent to the head-end device, the uplink access is completed.

10. A head-end device, characterized by including:

The first allocation unit is used to set reservation resources and send reservation resource notification information to at least one terminal, wherein the reservation resource notification information is used to indicate the time location of the reservation resource; the reservation unit is used to receive the at least one Reservation signals sent by the terminal through the reservation resources respectively;

The second allocation unit is configured to respectively send the above information to the at least one terminal according to the reservation signal. The access resource allocation message is received, so that the at least one terminal performs uplink access through the uplink access resource corresponding to the access resource allocation message.

11. The head-end device according to claim 10, characterized in that:

The first allocation unit is also used to periodically set the reservation resources;

Correspondingly, the head-end device also includes:

A setting period adjustment unit, configured to reduce the setting period of the reserved resource according to the reservation signal.

12. The head-end device according to claim 11, characterized in that: the setting period adjustment unit is also configured to: within the first preset time, if the number of the reservation signals received exceeds a preset threshold, then Reduce the setting period of the reserved resources.

13. The head-end device according to claim 11 or 12, further comprising: a reset unit, configured to: within the second preset time, if no reservation signal sent by other terminals through the reservation resource is received , then the setting period of the reserved resource is restored to the initial value.

14. The head-end device according to any one of claims 10-12, characterized in that: the reservation signal includes a first orthogonal sequence;

Correspondingly, the second allocation unit is also configured to perform correlation processing according to the first orthogonal sequence in the reservation signal, and if the generated first correlation peak exceeds a first preset value, the uplink access resource is Assign messages for broadcast.

15. The head-end device according to claims 10-14, further comprising: an access detection unit, configured to receive the uplink access corresponding to the at least one terminal through the uplink access resource allocation message. The second orthogonal sequence sent by the resource is subjected to correlation processing according to each second orthogonal sequence. If the generated second correlation peak exceeds the second preset value, the identifier of the second orthogonal sequence is determined, and the The identity is carried and sent in the access response.

16. A terminal, characterized in that it includes:

A reservation signal sending unit, configured to obtain the time location of the reservation resource based on the identified reservation resource notification information, and send a reservation signal to the head-end device through the reservation resource;

The uplink access unit is configured to receive the uplink access resource allocation message sent by the head-end device, and perform uplink access through the uplink access resource corresponding to the access resource allocation message.

17. The terminal according to claim 16, characterized in that:

The reservation signal sending unit is also configured to, if a periodically set reservation resource is identified, send the first An orthogonal sequence is carried in the reservation signal, and the reservation signal is sent to the head-end device through the reservation resource;

The uplink access unit is also configured to receive the uplink access resource allocation message sent by the head-end device and carry the uplink access resource allocation message, and perform uplink access through the uplink access resource corresponding to the access resource allocation message.

18. The terminal according to claim 16 or 17, characterized in that:

The uplink access unit is further configured to select a second orthogonal sequence from a second orthogonal sequence set, and send the second orthogonal sequence to the head-end device through the uplink access resource corresponding to the access resource allocation message. Orthogonal sequence, and receiving an access response carrying an identifier sent by the head-end device. If the identifier in the access response is the same as the identifier of the second orthogonal sequence sent to the head-end device, then the process is completed. Uplink access.

19. An uplink access system, characterized by including:

The head-end device according to any one of claims 10-15, and a plurality of terminals according to any one of claims 16-18.