CN102170676B - Method, device and system for access control - Google Patents

Abstract

The embodiment of the invention discloses a method, device and system for access control, belonging to the technical field of communication. The method comprises the following steps: detecting resource information of a backhaul link among relay stations, wherein the resource information comprises quantity of used resource blocks and quantity of unused resource blocks of the shared channel of the backhaul link; determining whether the resource of the backhaul link is restricted; and if the resource is restricted, sending an order that the resource of the backhaul link is restricted to forbid accessing to a terminal before load bearing is established. According to the embodiment of the invention, the response to refuse access to the terminal can be accelerated, and waste of signaling resources can be reduced when the resource of the backhaul link is restricted.

Description

Access control method, device, and system

technical field

The present invention relates to the field of communication technology, in particular to an admission control method, equipment and system.

Background technique

In a traditional network, the wireless connection between the base station and the terminal is a direct wireless connection, that is, a single-hop network. The relay technology is to add one or more relay stations (Relay) between the base station and the terminal to be responsible for one or more signal forwarding of the wireless signal sent by the base station until the terminal. Taking the simple two-hop relay as an example, it is to divide a wireless link from the base station to the terminal into two wireless links from the base station to the relay station and from the relay station to the terminal, so that there is an opportunity to replace a wireless link with poor quality Two wireless links with better quality can be used to obtain higher link capacity and better coverage. Among them, the wireless link from the base station to the relay station is also called a backhaul link (Backhaul link), and the wireless link from the relay station to the terminal is called an access link (Access link).

In network access, if there are many terminals connected under the relay station, it will inevitably cause resource shortage on the backhaul link. At this time, the system should start the admission control of terminals. In other words, when the resources of the backhaul link are limited , the base station should prohibit the terminal from re-accessing the network to ensure the service experience of other connected terminals. To this end, the prior art provides an admission control method, which is used to implement admission control on terminals when backhaul link resources are limited. Wherein, the implementation process of the access control method is shown in Figure 1, including the following steps:

101. A radio resource control (Radio Resource Control, RRC) connection is established between the terminal (User Equipment, UE) and the relay station (Relay);

102. The terminal initiates a service request (Service Request) or initiates a service request to the terminal mobility management entity (UE Mobility Management Entity, UE_MME) after receiving the downlink data arrival notification from the network side;

103. After receiving the Service Request initiated by the terminal, the terminal mobility management entity (UE_MME) initiates a bearer setup request (Bear Setup Request) to the relay station;

104. After receiving the Bear Setup Request initiated by UE_MME, the relay station performs admission control on the access link. If the access link has no resources to accommodate this bearer, it will directly return a rejection response to UE_MME, and the service request of the terminal will be rejected; if If the access link has resources to accommodate the bearer, it initiates a bearer resource modification request to the relay station mobility management entity (Relay_MME), relay station packet gateway (Relay, Relay_Packet Data Net Gateway, Relay_PGW)/signaling gateway (Single Gateway, SGW) ( Request Bear Resource Modification);

105. The Relay_MME receives the bearer modification instruction initiated by the Relay_PGW/SGW;

106. The Relay_MME initiates a bearer setup request (Bear Setup Request) to the base station (eNB). At this time, the base station will perform admission control on the backhaul link. If there is no resource on the backhaul link to accommodate the bearer, the base station will reject the bearer. The terminal business requests will also be rejected.

The above admission control method is similar to the admission control method in the small base station scenario. In the small base station scenario, the devices that perform the backhaul link air interface transmission and reception are the backhaul user equipment (Backhaul User Equipment, BUE) and the backhaul base station (Backhaul eNodeB, B-eNB), where the wireless connection between the BUE and the B-eNB ; The BUE and the small base station are bound in a wired manner, and the B-eNB and the network side are connected in a wired manner. Among them, the wireless link between BUE and B-eNB is also called Backhaul link, and the wireless link between small base station and terminal is also called Access link.

In the above admission control method, if the resources of the backhaul link are limited but the resources of the access link are not, the base station can only perform admission control after receiving the Bear Setup Request initiated by the network side Relay_MME, resulting in rejection The response to terminal access is not very timely, and if each admission control is performed after bearer establishment and bearer resource modification, it will increase the overhead of system signaling and cause waste of signaling resources.

Contents of the invention

In view of the above defects, the embodiments of the present invention provide an admission control method, device, and system, which are used to speed up the response of terminal access rejection and reduce the waste of signaling resources in the case of limited backhaul link resources.

Among them, the embodiment of the present invention provides an admission control method, including:

Detect resource information of the backhaul link with the relay station, where the resource information includes the number of used resource blocks and the number of unused resource blocks of the shared channel on the backhaul link; and

Determine whether the resources of the backhaul link are limited, and if so, send an indication that the resources of the backhaul link are limited to the network device for prohibiting terminal access before the bearer is established;

Wherein, the network device includes: a relay station and a terminal mobility management entity.

Among them, the embodiment of the present invention provides another access control method, including:

Detect resource information of the backhaul link with the backhaul user terminal equipment, where the resource information includes the number of used resource blocks and the number of unused resource blocks of the shared channel on the backhaul link; and

Determine whether the resources of the backhaul link are limited, and if so, send an indication that the resources of the backhaul link are limited to the network device for prohibiting terminal access before the bearer is established;

Wherein, the network device includes: a terminal mobility management entity.

Correspondingly, an embodiment of the present invention provides an admission control device, including:

A first detecting unit, configured to detect resource information of a backhaul link with the relay station, where the resource information includes the number of used resource blocks and the number of unused resource blocks of the shared channel on the backhaul link; and

a first determination unit, configured to determine whether the resources of the backhaul link are limited according to the resource information detected by the first detection unit;

A first sending unit, configured to, when the first determining unit determines that the resources of the backhaul link are limited, send a backhaul link resource limited indication to the network device for prohibiting terminal access before the bearer is established;

Wherein, the network device includes: a relay station and a terminal mobility management entity.

Correspondingly, the embodiment of the present invention also provides another admission control device, including:

The second detection unit is used to detect the resource information of the backhaul link with the backhaul user terminal equipment, and the resource information includes the number of used resource blocks and the number of unused resource blocks of the shared channel on the backhaul link; and

a second determination unit, configured to determine whether the resources of the backhaul link are limited according to the resource information detected by the second detection unit;

The second sending unit is configured to, when the second determining unit determines that the resources of the backhaul link are limited, send a backhaul link resource limited indication to the network device for prohibiting terminal access before the bearer is established;

Wherein, the network device includes: a terminal mobility management entity.

Correspondingly, an embodiment of the present invention also provides an admission control system, including an admission control device and a relay station;

The admission control device is configured to detect resource information of a backhaul link with the relay station, where the resource information includes the number of used resource blocks and the number of unused resource blocks of the shared channel on the backhaul link; and determine the Whether the resources of the backhaul link are limited, and if so, send an indication that the resources of the backhaul link are limited to the relay station;

The relay station is configured to receive the indication of limited backhaul link resources sent by the admission control device, and prohibit the terminal from accessing when receiving the request for establishing a radio resource control connection sent by the terminal.

Correspondingly, the embodiment of the present invention also provides another admission control system, including an admission control device, a backhaul user terminal device, and an access point bound to the backhaul user terminal device;

The admission control device is configured to detect resource information of a backhaul link with the backhaul user terminal equipment, where the resource information includes the number of used resource blocks and the number of unused resource blocks of the shared channel on the backhaul link; And determine whether the resources of the backhaul link are limited, and if so, send an indication that the resources of the backhaul link are limited to the backhaul user terminal equipment;

The backhaul user terminal equipment is configured to receive the backhaul link resource restriction indication sent by the admission control device, and send the backhaul link resource restriction indication to the access point;

The access point is configured to receive the indication of limited backhaul link resources sent by the backhaul user terminal equipment, and prohibit the terminal from accessing when receiving the request for establishing a radio resource control connection sent by the terminal.

In the embodiment of the present invention, the admission control device can detect the resource information of the backhaul link, and after determining that the resources of the backhaul link are limited, send an indication of the resource limitation of the backhaul link to prohibit terminal access before the bearer is established. . Compared with the prior art, the embodiment of the present invention does not prohibit terminal access after receiving the bearer establishment request sent by the network side, thereby speeding up the response of rejecting terminal access; in addition, the embodiment of the present invention prohibits terminal access Control does not need to be performed after bearer establishment and bearer resource modification, thereby reducing system signaling overhead and waste of signaling resources.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without paying creative labor.

FIG. 1 is a schematic flow diagram of an access control method provided by the prior art;

FIG. 2 is a schematic diagram of an admission control scenario provided by an embodiment of the present invention;

FIG. 3 is a schematic flowchart of an admission control method provided by an embodiment of the present invention;

FIG. 4 is a schematic flow chart of the admission control method described in FIG. 3;

FIG. 5 is a schematic flowchart of another admission control method provided by an embodiment of the present invention;

FIG. 6 is a schematic flowchart of another admission control method provided by an embodiment of the present invention;

FIG. 7 is a schematic diagram of another admission control scenario provided by an embodiment of the present invention;

FIG. 8 is a schematic flowchart of another admission control method provided by an embodiment of the present invention;

FIG. 9 is a schematic flow chart of the admission control method described in FIG. 8;

FIG. 10 is a schematic flowchart of another admission control method provided by an embodiment of the present invention;

FIG. 11 is a schematic flowchart of another admission control method provided by an embodiment of the present invention;

FIG. 12 is a schematic structural diagram of an admission control device provided by an embodiment of the present invention;

FIG. 13 is a schematic structural diagram of another admission control device provided by an embodiment of the present invention;

FIG. 14 is a schematic structural diagram of an admission control system provided by an embodiment of the present invention;

FIG. 15 is a schematic structural diagram of another admission control system provided by an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Embodiments of the present invention provide an admission control method, device, and system, which are used to speed up the response of rejecting terminal access, reduce the overhead of system signaling, and reduce the waste of signaling resources when backhaul link resources are limited. . Each will be described in detail below.

Further, before introducing the admission control method provided by the embodiment of the present invention, the embodiment of the present invention first describes a scenario applicable to the admission control method provided by the embodiment of the present invention, as shown in FIG. 2 . The scenario shown in FIG. 2 is a typical relay network scenario, where MME represents a mobility management entity, Relay_1 and Relay_2 respectively represent relay stations located in two different ranges, and the control base station of Relay_1 and Relay_2 is an eNB. Wherein, the existing control interface between MME and eNB is S1-MME; the interface between Relay_1, Relay_2 and eNB is wireless Un interface. In order to meet the backward compatibility for Long Term Evolution (LTE) terminals, the interface between the base station and the terminal in the original LTE network, that is, the Uu interface, is reused between the relay station and the terminal. Among them, the wireless link between the eNB and Relay_1, Relay_2 is called a backhaul link (Backhaul link); the wireless link between Relay_1, Relay_2 and the terminal is called an access link (Access link).

In the scenario described in Figure 2, when there are many terminals connected under the relay station (Relay_1, Relay_2), the resources of the Backhaul link will be tight. At this time, the eNB needs to perform admission control, that is, the resources for the Backhaul link are limited. , the eNB should prohibit new terminals from re-accessing the network, so as to ensure the service experience of other connected terminals.

In the following, the embodiment of the present invention will introduce in detail an admission control method provided by the embodiment of the present invention in combination with the scenario described in FIG. 2 above. This method can prohibit the terminal from re-accessing the network when the resources of the Backhaul link are limited. Please refer to FIG. 3 . FIG. 3 is a schematic flowchart of an admission control method provided by an embodiment of the present invention, which is applied in a scenario similar to that described in FIG. 2 . Wherein, the admission control method may include the following steps:

301. Detect resource information of the backhaul link with the relay station, where the resource information includes the number of used resource blocks (Resource Block, RB) and the number of unused RBs of the shared channel on the backhaul link.

Wherein, data is transmitted on the backhaul link through a shared channel, which is common knowledge known to those skilled in the art, and will not be discussed in detail in this embodiment of the present invention.

Wherein, in a relay network similar to that shown in FIG. 2 , the wireless link between the eNB and the relay station is the backhaul link between the eNB and the relay station. For the eNB, the resource information of the backhaul link with the relay station can be detected periodically. Since the specific implementation manner of the eNB detecting the resource information of the backhaul link between the relay station is common knowledge known to those skilled in the art, the embodiments of the present invention will not be repeated here.

302. Determine whether the resource of the above-mentioned backhaul link is limited, if yes, perform step 303; if not, perform step 304.

Specifically, the eNB can calculate the ratio of the number of used RBs to the number of unused RBs on the shared channel on the Backhaul link. If the ratio reaches (greater than or equal to) a preset threshold value, it is determined that the resources of the Backhaul link are limited. It can be understood that, in a specific embodiment, it may also be determined that the resources of the Backhaul link are limited when the ratio is greater than a preset threshold. The specific condition is that "reaching the preset threshold" or "greater than the preset threshold" does not affect the implementation of the present invention, and is not limited here.

Further, as an optional implementation, in the embodiment of the present invention, the eNB may preset two thresholds, which are the maximum threshold T _high and the minimum threshold T _low respectively; when the eNB performs the above steps After 301, the eNB can calculate the ratio of the number of used RBs to the number of unused RBs on the shared channel on the Backhaul link. If the ratio reaches the preset maximum threshold value T _high , it is determined that the resources of the Backhaul link are limited; if the ratio is less than The preset minimum threshold value T _low determines that the resources of the Backhaul link are not limited.

As another optional implementation, in the embodiment of the present invention, the eNB can also only set a preset threshold value. After the eNB executes the above step 301, the eNB can calculate the number of used RBs of the shared channel on the Backhaul link and The ratio of the number of unused RBs. If the ratio is greater than or equal to the preset threshold, it is determined that the resources of the Backhaul link are limited; if the ratio is smaller than the preset threshold, it is determined that the resources of the Backhaul link are not limited.

The methods for determining whether the resources of the above-mentioned backhaul link are limited in the subsequent embodiments of the present invention may be implemented by any one of the above-mentioned implementation manners, and will not be repeated in the subsequent embodiments.

303. Sending a Backhaul link resource limited indication is used to prohibit terminal access before the bearer is established.

In the embodiment of the present invention, the eNB may send a Backhaul link resource limited indication to network devices such as relay stations and terminal mobility management entities to prohibit terminal access before bearer establishment.

For example, if in the scenario shown in Figure 2, eNB determines that the Backhaul link resource between Relay_1 and Relay_1 is limited, then eNB can send an indication of Backhaul link resource limitation to Relay_1, so that Relay_1 receives its coverage When the RRC connection establishment request is sent by the terminal under , the terminal is prohibited from accessing.

For another example, if in the scenario shown in Figure 2, eNB determines that the Backhaul link resources between Relay_1 and Relay_2 are limited, then eNB can send Backhaul link resource limited indications to Relay_1 and Relay_2 respectively, so that Relay_1 and Relay_2 prohibit terminal access when receiving a request for establishing a radio resource control connection sent by a terminal under their respective coverage areas.

304. Send an indication that the Backhaul link resource is not limited to allow terminal access.

For example, if in the scenario shown in Figure 2, eNB determines that the Backhaul link resources with Relay_2 are not limited, then eNB can send an indication that the Backhaul link resources are not limited to Relay_2, so that Relay_2 receives its When a terminal under coverage sends a radio resource control connection establishment request, the terminal is allowed to continue to access.

In order to further understand the admission control method described in FIG. 3 , please also refer to FIG. 4 . FIG. 4 is a schematic flow chart of the admission control method described in FIG. 3 . As shown in Figure 4, the specific process of the method may include the following steps:

401. The resource of the Backhaul link between the base station detection and the relay station is limited.

402. The base station sends a Backhaul link resource limited indication to the relay station.

Among them, the base station can send the Backhaul link resource limited indication to the relay station through RRC signaling, broadcast message or other private signaling, or the base station can also put the Backhaul link resource limited indication in the master information block (Master Information Block, MIB ) or in-band signaling (Signaling InBand, SIB), and broadcast to the relay station, which is not limited in the embodiment of the present invention.

403. When the terminal wants to establish an RRC connection with the relay station, send an RRC connection establishment request to the relay station; when the relay station receives the RRC connection establishment request sent by the terminal, prohibit the terminal from accessing.

In the admission control method provided by the embodiment of the present invention, when the eNB determines that the resources of the Backhaul link are limited, as long as it receives the request for establishing a radio resource control connection sent by the terminal, it prohibits the terminal from accessing, without waiting for the request to be received from the network side. The terminal access is prohibited after the bearer establishment request is sent, so that the response of terminal access rejection can be accelerated; in addition, in the admission control method provided by the embodiment of the present invention, terminal access does not need to be performed after the bearer establishment and bearer resource modification , so that the overhead of system signaling can be reduced, and the waste of signaling resources can be reduced.

Please refer to FIG. 5 . FIG. 5 is a schematic flowchart of another admission control method provided by an embodiment of the present invention, which is applied in a scenario similar to that described in FIG. 2 . Wherein, the admission control method may include the following steps:

501. The resource of the Backhaul link between the base station detection and the relay station is limited.

502. The base station sends a Backhaul link resource limited indication to the terminal mobility management entity.

503. The terminal establishes an RRC connection with the relay station.

504. The terminal mobility management entity prohibits the terminal from accessing when receiving the service request sent by the terminal.

Among them, after the terminal establishes an RRC connection with the relay station, the terminal can initiate a service request (Service Request) or initiate a service request to the terminal mobility management entity (UE_MME) after receiving the downlink data arrival notification from the network side. When a service request is made, terminal access is prohibited.

As an optional implementation, in the embodiment of the present invention, if the terminal is a terminal in a Universal Mobile Telecommunications System (UMTS), then in the admission control method shown in Figure 5, UE_MME can be replaced A general packet radio service support node (Servicing GPRS Support Node, SGSN) can also implement the admission control method provided by the embodiment of the present invention.

In the admission control method shown in Figure 5, when the base station detects that the resources of the Backhaul link between the relay station and the relay station are limited, it can send a Backhaul link resource limited indication to the UE_MME on the network side, as long as the UE_MME receives the information sent by the terminal The service request prohibits terminal access without waiting for the bearer establishment request sent by the network side to prohibit terminal access, thereby speeding up the response to rejecting terminal access; in addition, in the admission control method shown in Figure 5, Prohibiting terminal access does not need to be performed after bearer establishment and bearer resource modification, thereby reducing system signaling overhead and waste of signaling resources.

Please refer to FIG. 6 . FIG. 6 is a schematic flowchart of another admission control method provided by an embodiment of the present invention, which is applied in a scenario similar to that described in FIG. 2 . Wherein, the admission control method may include the following steps:

601. The resource of the Backhaul link between the base station detection and the relay station is limited.

602. The base station sends a Backhaul link resource limited indication to the relay station.

603. The relay station broadcasts an access prohibition message to terminals within its coverage area to prohibit terminal access.

Wherein, the manner in which the relay station broadcasts the access prohibition message is: the relay station broadcasts the access prohibition message through the in-band signaling SIB.

Wherein, the terminal does not attempt to establish an RRC connection with the relay station after receiving the access prohibition message broadcast by the relay station.

In the admission control method shown in Figure 6, when the base station detects that the resources of the Backhaul link between the relay station and the relay station are limited, it can send a Backhaul link resource limited indication to the relay station, and the relay station broadcasts an access prohibition message to the terminal. The terminal no longer tries to establish an RRC connection with the relay station, so as to prohibit the terminal access without waiting for the bearer establishment request sent by the network side to prohibit the terminal access, thereby speeding up the response of rejecting the terminal access; in addition, Fig. In the admission control method shown in 6, terminal access does not need to be performed after bearer establishment and bearer resource modification, thereby reducing system signaling overhead and waste of signaling resources.

Further, the embodiment of the present invention describes another scenario applicable to the admission control method provided by the embodiment of the present invention, as shown in FIG. 7 . The scenario shown in Figure 7 can also be regarded as a special relay network scenario. Among them, the LTE Pico and the UMTS access point (Access Point, AP) are the access points (that is, small base stations) of the LTE system and the UMTS system respectively, and serve the terminals of the respective systems. Among them, the data of LTE Pico and UMTS AP are not directly transmitted to the core network through wired methods, but are sent to a convergence point through air interface transmission, and then sent to the network side by the convergence point. In the embodiment of the present invention, this air interface transmission mode is called air interface backhaul, if the air interface adopts Time Division Duplexing (Time Division Duplexing, TDD) technology, then this air interface transmission mode can be named as time division duplex backhaul (TDD Backhaul, TBH). In the scenario shown in Figure 7, the devices that perform backhaul link air interface transmission and reception are the backhaul user equipment (Backhaul User Equipment, BUE) and the backhaul base station (Backhaul eNodeB, B-eNB), that is to say, the distance between the BUE and the B-eNB The room is a wireless connection; among them, BUE and LTE Pico or UMTS AP are bound in a wired way, and B-eNB and the network side are connected in a wired way. Similar to the scenario shown in Figure 2, in the scenario shown in Figure 7, the wireless link between BUE and B-eNB is called Backhaul link, and the wireless link between LTE Pico/UMTS AP and terminal is also called Access link.

In the scenario described in Figure 7, when there are many terminals connected to the access point (LTE Pico, UMTS AP), it will cause Backhaul link resource shortage. At this time, the B-eNB needs to perform admission control, that is, for When the resources of the Backhaul link are limited, the B-eNB should prohibit new terminals from re-connecting to the network to ensure the service experience of other connected terminals.

In the following, the embodiment of the present invention will introduce in detail an admission control method provided by the embodiment of the present invention in combination with the scenario described in FIG. 7 above. This method can prohibit the terminal from re-accessing the network when the resources of the Backhaul link are limited. Please refer to FIG. 8 . FIG. 8 is a schematic flowchart of an admission control method provided by an embodiment of the present invention, which is applied in a scenario similar to that described in FIG. 7 . Wherein, the admission control method may include the following steps:

801. Detect the resource information of the Backhaul link with the BUE, where the resource information includes the number of used RBs and the number of unused RBs of the shared channel on the Backhaul link.

For the B-eNB, the resource information of the Backhaul link with the BUE can be detected periodically. Since the specific implementation of the resource information of the Backhaul link between the B-eNB detection and the BUE is similar to the specific implementation of the resource information of the Backhaul link between the eNB detection and the relay station, the embodiments of the present invention will not be described here.

802. Determine whether the resources of the Backhaul link are limited, if yes, execute step 803; if not, execute step 804.

Wherein, the manner in which the B-eNB determines whether the resources of the Backhaul link are limited in the above step 802 may be the same as the manner in which the eNB determines whether the resources of the Backhaul link are limited, and the embodiment of the present invention will not repeat it here.

803. Sending a Backhaul link resource limited indication is used to prohibit terminal access before the bearer is established.

In the embodiment of the present invention, the B-eNB may send a Backhaul link resource restriction indication to network devices such as relay stations and terminal mobility management entities to prohibit terminal access before the bearer is established.

For example, if in the scenario shown in Figure 7, the B-eNB determines that the Backhaul link resource between the BUE in the LTE system is limited, then the B-eNB can send a Backhaul link resource limited indication to the LTE system The BUE in the LTE system sends the Backhaul link resource limitation indication sent by the B-eNB to the LTE Pico bound to it. When the LTE Pico receives the radio resource control connection establishment request sent by the terminal under its coverage , prohibit terminal access.

For example, if in the scenario shown in Figure 7, the B-eNB determines that the Backhaul link resources between the LTE system and the BUE in the UMTS system are both limited, then the B-eNB can send the Backhaul link resource limited Indicate to the BUE in the LTE system and UMTS system, and the BUE in the LTE system and UMTS system will send the Backhaul link resource limitation indication sent by the B-eNB to the respective bound LTE Pico and UMTS AP; LTE Pico and UMTS AP are in When receiving a request for establishing a radio resource control connection sent by a terminal under the respective coverage areas, the terminal is prohibited from accessing.

804. Send an indication that the Backhaul link resource is not limited to allow terminal access.

For example, if in the scenario shown in Figure 7, the B-eNB determines that the Backhaul link resources with the BUE in the UMTS system are not limited, then the B-eNB can send an indication that the Backhaul link resources are not limited to the UMTS The BUE in the system, the BUE in the UMTS system sends the Backhaullink resource unlimited indication sent by the B-eNB to the bound UMTS AP, and the UMTS AP establishes a radio resource control connection after receiving the message sent by the terminal under its coverage When requested, the terminal is allowed to continue accessing.

In order to further understand the admission control method described in FIG. 8 , please also refer to FIG. 9 . FIG. 9 is a schematic flow chart of the admission control method described in FIG. 8 . As shown in Figure 9, the specific process of the method may include the following steps:

901. A backhaul base station (B-eNB) detects that resources of a Backhaullink between a backhaul user equipment (BUE) and a backhaul user equipment (BUE) are limited.

902. The B-eNB sends the Backhaul link resource limited indication to the BUE, and the BUE then sends the Backhaul link resource limited indication sent by the B-eNB to its bound access point (LTE Pico and/or UMTSAP).

903. When the terminal wants to establish an RRC connection with the access point (LTE Pico and/or UMTS AP), send an RRC connection establishment request to the middle access point (LTE Pico and/or UMTS AP); the access point (LTE Pico and/or or UMTS AP) when receiving the RRC connection establishment request sent by the terminal, the terminal is prohibited from accessing.

In the admission control method described in Fig. 8 and Fig. 9, when the B-eNB determines that the resources of the Backhaul link between the BUE and the BUE are limited, the B-eNB sends the resource restriction indication of the Backhaul link to the BUE via the BUE. The access point bound to the BUE, as long as the access point receives the RRC connection establishment request sent by the terminal, it will prohibit the terminal from accessing, without waiting for the bearer establishment request sent by the network side to prohibit the terminal from accessing, so that it can Speed up the response to denying terminal access; in addition, in the admission control methods described in Figures 8 and 9, prohibiting terminal access does not need to be performed after bearer establishment and bearer resource modification, thereby reducing system signaling overhead and reducing Waste of signaling resources.

In the embodiment of the present invention, through the admission control method described above in Figure 8 and Figure 9, it is possible to prohibit terminal access when TBH backhaul link resources are limited, which makes up for the inability to address the shortage of Backhaul link resources in the current TBH scenario. Insufficient access control.

Please refer to FIG. 10 . FIG. 10 is a schematic flowchart of another admission control method provided by an embodiment of the present invention, which is applied in a scenario similar to that described in FIG. 7 . Wherein, the admission control method may include the following steps:

1001. A backhaul base station (B-eNB) detects that resources of a Backhaul link between a backhaul user equipment (BUE) and a backhaul user equipment (BUE) are limited.

1002. The B-eNB sends a Backhaul link resource limited indication to UE_MME and/or SGSN.

Among them, if the B-eNB detects that the resources of the Backhaul link between the BUE and the LTE system are limited, the B-eNB sends a Backhaul link resource limitation indication to the UE_MME;

And/or, if the B-eNB detects that the resource of the Backhaul link between the BUE in the UMTS system is limited, the B-eNB sends a Backhaul link resource limited indication to the SGSN.

1003. The terminal establishes an RRC connection with the access point.

1004. UE_MME and/or SGSN prohibits the terminal from accessing when receiving the service request sent by the terminal.

In the admission control method shown in Figure 10, when the B-eNB detects that the resources of the Backhaul link with the BUE are limited, it can send a Backhaul link resource limitation indication to the UE_MME and/or SGSN on the network side, UE_MME And/or the SGSN prohibits terminal access as long as it receives the service request sent by the terminal, instead of prohibiting terminal access after receiving the bearer establishment request sent by the network side, so as to speed up the response of rejecting terminal access; in addition, Fig. In the admission control method shown in 10, terminal access does not need to be performed after bearer establishment and bearer resource modification, thereby reducing system signaling overhead and waste of signaling resources.

Please refer to FIG. 11 . FIG. 11 is a schematic flowchart of another admission control method provided by an embodiment of the present invention, which is applied in a scenario similar to that described in FIG. 7 . Wherein, the admission control method may include the following steps:

1101. A backhaul base station (B-eNB) detects that resources of a Backhaullink between a backhaul user equipment (BUE) and a backhaul user equipment (BUE) are limited.

1102. The B-eNB sends the Backhaul link resource limited indication to the BUE, and the BUE then sends the Backhaul link resource limited indication sent by the B-eNB to its bound access point (LTE Pico and/or UMTSAP).

1103. The access point (LTE Pico and/or UMTS AP) broadcasts an access prohibition message to terminals within its coverage area, prohibiting terminal access.

Wherein, the manner in which the access point broadcasts the access prohibition message is: the access point broadcasts the access prohibition message through the in-band signaling SIB.

Wherein, the terminal does not attempt to establish an RRC connection with the access point after receiving the access prohibition message broadcast by the relay station.

In the admission control method shown in Figure 11, when the B-eNB detects that the resources of the Backhaul link with the BUE are limited, the B-eNB can send a Backhaul link resource limited indication to the access point bound to the BUE via the BUE , the access point broadcasts an access prohibition message to the terminal, so that the terminal no longer attempts to establish an RRC connection with the access point, so as to prohibit the terminal from accessing, without waiting for the terminal to be prohibited from accessing after receiving the bearer establishment request sent by the network side. In addition, in the admission control method shown in Figure 11, terminal access is prohibited after bearer establishment and bearer resource modification, thereby reducing system signaling Waste of signaling resources.

Please refer to FIG. 12 . FIG. 12 is a schematic structural diagram of an admission control device provided by an embodiment of the present invention, which is applied in a scenario similar to that described in FIG. 2 . Wherein, the admission control device may be used to realize the admission control function of the base station (eNB) in the scenario shown in FIG. 2 . Wherein, the admission control device may include:

The first detection unit 1201 is used to detect the resource information of the Backhaul link between the relay station and the relay station, the resource information includes the number of used RBs and the number of unused RBs of the shared channel on the Backhaul link; and

The first determining unit 1202 is configured to determine whether the resources of the Backhaul link are limited;

The first sending unit 1203 is configured to, when the resources of the Backhaul link are limited, send a Backhaul link resource limited indication to prohibit terminal access before the bearer is established.

As an optional implementation manner, in the embodiment of the present invention, the first sending unit 1203 may send a backhaul link resource limited indication to the relay station when the resource of the backhaul link is limited, so that the relay station receives the information sent by the terminal. When a radio resource control connection request is established, terminal access is prohibited.

As another optional implementation manner, in the embodiment of the present invention, the first sending unit 1203 may also send a Backhaul link resource limited indication to the terminal mobility management entity when the Backhaul link resource is limited, so that the terminal mobility When the management entity receives the service request sent by the terminal, it prohibits the terminal from accessing;

And/or, send a Backhaul link resource limited indication to the SGSN, so that the SGSN prohibits the terminal from accessing when receiving the service request sent by the terminal.

As another optional implementation, in the embodiment of the present invention, the first sending unit 1203 can also be used to send a Backhaul link resource limited indication to the relay station when the resources of the Backhaul link are limited, so that the relay station broadcasts access prohibition message, terminal access is prohibited;

Wherein, the manner in which the relay station broadcasts the access prohibition message is: the relay station broadcasts the access prohibition message through the in-band signaling SIB.

As an optional implementation, in the embodiment of the present invention, the first determining unit 1202 can be used to calculate the ratio of the number of used RBs to the number of unused RBs on the shared channel on the Backhaul link, if the ratio reaches the preset maximum threshold value, it is determined that the resources of the Backhaul link are limited; if the ratio is less than the preset minimum threshold value, it is determined that the resources of the Backhaul link are not limited.

As another optional implementation, in the embodiment of the present invention, the first determining unit 1202 can also be used to calculate the ratio of the number of used RBs to the number of unused RBs on the shared channel on the Backhaul link, if the ratio is greater than or equal to the preset If the ratio is less than the preset threshold value, it is determined that the resources of the Backhaul link are not limited.

It can be understood that, in a specific embodiment, it can be determined that the resources of the Backhaul link are limited when the ratio reaches the preset threshold, or it can be determined that the resources of the Backhaul link are limited when the ratio is greater than the preset threshold. It does not affect the implementation of the present invention and is not limited here.

In the admission control device shown in FIG. 12 , the first detecting unit 1201 can detect the resource information of the backhaul link, and after the first determining unit 1202 determines that the resources of the backhaul link are limited, the first sending unit 1203 sends The indication of limited backhaul link resources is used to prohibit terminal access before the bearer is established. Compared with the prior art, the embodiment of the present invention does not prohibit terminal access after receiving the bearer establishment request sent by the network side, thereby speeding up the response of rejecting terminal access; in addition, the admission control provided by the embodiment of the present invention Device prohibition of terminal access control does not need to be performed after bearer establishment and bearer resource modification, thereby reducing system signaling overhead and waste of signaling resources.

Please refer to FIG. 13 . FIG. 13 is a schematic structural diagram of another admission control device provided by an embodiment of the present invention, which is applied in a scenario similar to that described in FIG. 7 . Wherein, the admission control device may be used to realize the admission control function of the backhaul base station (B-eNB) in the scenario shown in FIG. 7 . Wherein, the admission control device may include:

The second detection unit 1301 is used to detect the resource information of the Backhaul link between the backhaul user terminal equipment, and the resource information includes the number of used RBs and the number of unused RBs of the shared channel on the Backhaul link; and

The second determination unit 1302 is configured to determine whether the resources of the Backhaul link are limited;

The second sending unit 1303 is configured to send a Backhaul link resource limited indication to prohibit terminal access before the bearer is established when the resources of the Backhaul link are limited.

As an optional implementation manner, in the embodiment of the present invention, the second sending unit 1303 may send an indication of limited backhaul link resources to the backhaul user terminal equipment via the backhaul user terminal equipment when the resources of the backhaul link are limited. A specified access point, so that the access point prohibits the terminal from accessing when receiving the request for establishing a radio resource control connection sent by the terminal.

As another optional implementation manner, in the embodiment of the present invention, the second sending unit 1303 may also be used to send a Backhaul link resource limited indication to the terminal mobility management entity when the Backhaul link resource is limited, so that the terminal When the mobility management entity receives the service request sent by the terminal, it prohibits the terminal from accessing;

And/or, sending a Backhaul link resource limited indication to the GPRS support node, so that the GPRS support node prohibits the terminal from accessing when receiving the service request sent by the terminal.

As another optional implementation manner, in the embodiment of the present invention, the second sending unit 1303 may also be used to send a Backhaul link resource limited indication to the above-mentioned backhaul via the above-mentioned backhaul user terminal equipment when the resource of the Backhaul link is limited The access point bound to the user terminal equipment, so that the access point broadcasts an access prohibition message to prohibit terminal access;

Wherein, the manner in which the access point broadcasts the access prohibition message is: the access point broadcasts the access prohibition message through the in-band signaling SIB.

As an optional implementation, in the embodiment of the present invention, the second determination unit 1302 can be used to calculate the ratio of the number of used RBs to the number of unused RBs on the shared channel on the Backhaul link, if the ratio reaches the preset maximum threshold value, it is determined that the resources of the Backhaul link are limited; if the ratio is less than the preset minimum threshold value, it is determined that the resources of the Backhaul link are not limited.

As an optional implementation, in the embodiment of the present invention, the second determination unit 1302 can also be used to calculate the ratio of the number of used RBs to the number of unused RBs on the shared channel on the Backhaul link, if the ratio is greater than or equal to the preset gate If the ratio is less than the preset threshold value, it is determined that the resources of the Backhaul link are not limited.

It can be understood that, in a specific embodiment, it can be determined that the resources of the Backhaul link are limited when the ratio reaches the preset threshold, or it can be determined that the resources of the Backhaul link are limited when the ratio is greater than the preset threshold. It does not affect the implementation of the present invention and is not limited here.

In the admission control device shown in FIG. 13 , after the second determination unit 1302 determines that the resources of the backhaul link detected by the second detection unit 1301 are limited, the second sending unit 1303 sends the indication for backhaul link resource limitation. Terminal access is prohibited before the bearer is established. Compared with the prior art, the embodiment of the present invention does not prohibit terminal access after receiving the bearer establishment request sent by the network side, thereby speeding up the response of rejecting terminal access; in addition, the embodiment of the present invention prohibits terminal access Control does not need to be performed after bearer establishment and bearer resource modification, thereby reducing system signaling overhead and waste of signaling resources.

Please refer to FIG. 14 . FIG. 14 is a schematic structural diagram of an admission control system provided by an embodiment of the present invention, which is applied in a scenario similar to that described in FIG. 2 . Among them, the access control system may include:

Admission control device 1401 and relay station 1402;

As shown in FIG. 14 , the dotted line between the admission control device 1401 and the relay station 1402 indicates that there is a wireless connection between the admission control device 1401 and the relay station 1402 .

Among them, the admission control device 1401 is used to detect the resource information of the backhaul link with the relay station 1402, the resource information includes the number of used resource blocks and the number of unused resource blocks of the shared channel on the backhaul link; and determine the backhaul link Whether the resource of the road is limited, if so, then send the backhaul link resource limited indication to the relay station 1402;

Wherein, the relay station 1402 is configured to receive the indication of limited backhaul link resources sent by the admission control device 1401, and prohibit the terminal from accessing when receiving the request for establishing a radio resource control connection sent by the terminal.

Please refer to FIG. 15 . FIG. 15 is a schematic structural diagram of another admission control system provided by an embodiment of the present invention, which is applied in a scenario similar to that described in FIG. 7 . Among them, the access control system may include:

The admission control device 1501, the backhaul user terminal device 1502, and the access point 1503 bound to the backhaul user terminal device 1502;

As shown in Figure 14, the dotted line between the admission control device 1501 and the backhaul user terminal device 1502 indicates that there is a wireless connection between the admission control device 1501 and the backhaul user terminal device 1502; and the backhaul user terminal device 1502 and the access point 1503 The solid line between them indicates that there is a wired connection between the backhaul user terminal equipment 1502 and the access point 1503 .

Wherein, the admission control device 1501 is configured to detect the resource information of the backhaul link with the backhaul user terminal equipment 1502, and the resource information includes the number of used resource blocks and the number of unused resource blocks of the shared channel on the backhaul link; and Determine whether the resources of the backhaul link are limited, and if so, send an indication that the resources of the backhaul link are limited to the backhaul user terminal equipment;

The backhaul user terminal device 1502 is configured to receive the backhaul link resource restriction indication sent by the admission control device 1501, and send the backhaul link resource restriction indication to the access point 1503;

The access point 1503 is configured to receive the indication of limited backhaul link resources sent by the backhaul user terminal equipment 1503, and prohibit the terminal from accessing when receiving the request for establishing a radio resource control connection sent by the terminal.

In the admission control system provided by the embodiment of the present invention, when it is determined that the resources of the backhaul link are limited, as long as the request for establishing a radio resource control connection sent by the terminal is received, the access control system forbids the terminal to access without waiting for the request sent by the network side. The terminal access is prohibited only after the bearer establishment request, so that the response of terminal access rejection can be accelerated; in addition, the terminal access control in the admission control system provided by the embodiment of the present invention does not need to be performed after the bearer establishment and bearer resource modification. Therefore, the overhead of system signaling can be reduced, and the waste of signaling resources can be reduced.

Those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above-mentioned embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, and the storage medium can include: Flash disk, read-only memory (Read-OnlyMemory, ROM), random access device (Random Access Memory, RAM), magnetic disk or optical disk, etc.

The access control method, equipment, and system provided by the embodiments of the present invention are described above in detail. In this paper, specific examples are used to illustrate the principle and implementation of the present invention. The descriptions of the above embodiments are only used to help understand the present invention. The method of the invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and scope of application. In summary, the content of this specification should not be understood To limit the present invention.

Claims (22)

1. an admittance control method, is characterized in that, comprising:

Detect the resource information of the back haul link between relay station, described resource information comprises shared channel on described back haul link and has used Resource Block quantity and up resources number of blocks; And

Resource information according to described back haul link determines that whether the resource of described back haul link is limited, if so, then sends the limited instruction of backhaul link resource to the network equipment and is used for forbidding that terminal accessed before carrying is set up;

Wherein, the described network equipment comprises: relay station and fast mobile terminal management entity.

2. method according to claim 1, is characterized in that, describedly sends backhaul link resource limited instruction to the network equipment and is used for forbidding that terminal accessed before carrying is set up, and comprising:

Send that backhaul link resource is limited is indicated to described relay station, with make described relay station receive that terminal sends set up wireless resource control connection request time, forbid that described terminal accesses.

3. method according to claim 1, is characterized in that, describedly sends backhaul link resource limited instruction to the network equipment and is used for forbidding that terminal accessed before carrying is set up, and comprising:

Sending that backhaul link resource is limited is indicated to terminal mobility management entity, to make described terminal mobility management entity when receiving the service request that terminal sends, forbidding that described terminal accesses;

And/or, sending that backhaul link resource is limited is indicated to general packet wireless service support node, to make described general packet wireless service support node when receiving the service request that terminal sends, forbidding that described terminal accesses.

4. method according to claim 1, is characterized in that, describedly sends backhaul link resource limited instruction to the network equipment and is used for forbidding that terminal accessed before carrying is set up, and comprising:

Send that backhaul link resource is limited is indicated to described relay station, broadcast to make described relay station and forbid accessing message, forbid that terminal accesses.

5. the method according to Claims 1 to 4 any one, is characterized in that, the described resource information according to described back haul link determines that whether the resource of described back haul link is limited, comprising:

Calculate shared channel on described back haul link and used the ratio of Resource Block quantity and up resources number of blocks, if described ratio reaches default threshold value, then determine the resource-constrained of described back haul link.

6. an admittance control method, is characterized in that, comprising:

Detect the resource information of the back haul link between backhaul subscriber terminal equipment, described resource information comprises shared channel on described back haul link and has used Resource Block quantity and up resources number of blocks; And

Resource information according to described back haul link determines that whether the resource of described back haul link is limited, if so, then sends the limited instruction of backhaul link resource to the network equipment and is used for forbidding that terminal accessed before carrying is set up;

Wherein, the described network equipment comprises: fast mobile terminal management entity.

7. method according to claim 6, is characterized in that, describedly sends backhaul link resource limited instruction to the network equipment and is used for forbidding that terminal accessed before carrying is set up, and comprising:

By sending the limited access point being indicated to described backhaul subscriber terminal equipment and binding of backhaul link resource through described backhaul subscriber terminal equipment, with make described access point receive terminal send set up wireless resource control connection request time, forbid that described terminal accesses.

8. method according to claim 6, is characterized in that, describedly sends backhaul link resource limited instruction to the network equipment and is used for forbidding that terminal accessed before carrying is set up, and comprising:

Sending that backhaul link resource is limited is indicated to terminal mobility management entity, to make described terminal mobility management entity when receiving the service request that terminal sends, forbidding that described terminal accesses;

And/or, sending that backhaul link resource is limited is indicated to general packet wireless service support node, to make described general packet wireless service support node when receiving the service request that terminal sends, forbidding that described terminal accesses.

9. method according to claim 6, is characterized in that, describedly sends backhaul link resource limited instruction to the network equipment and is used for forbidding that terminal accessed before carrying is set up, and comprising:

By sending the limited access point being indicated to described backhaul subscriber terminal equipment and binding of backhaul link resource through described backhaul subscriber terminal equipment, broadcast to make described access point and forbid accessing message, forbid that terminal accesses.

10. the method according to claim 6 ~ 9 any one, is characterized in that, the described resource information according to described back haul link determines that whether the resource of described back haul link is limited, comprising:

Calculate shared channel on described back haul link and used the ratio of Resource Block quantity and up resources number of blocks, if described ratio reaches default threshold value, then determine the resource-constrained of described back haul link.

11. 1 kinds of access control equipment, is characterized in that, comprising:

First detecting unit, for detecting the resource information of the back haul link between relay station, described resource information comprises shared channel on described back haul link and has used Resource Block quantity and up resources number of blocks; And

First determining unit, the resource information for detecting according to described first detecting unit determines that whether the resource of described back haul link is limited;

First transmitting element, during for determining described back haul link resource-constrained in described first determining unit, sends the limited instruction of backhaul link resource to the network equipment and is used for forbidding that terminal accessed before carrying is set up;

Wherein, the described network equipment comprises: relay station and fast mobile terminal management entity.

12. equipment according to claim 11, is characterized in that,

Described first transmitting element, for when described back haul link resource-constrained, send that backhaul link resource is limited is indicated to described relay station, with make described relay station receive that terminal sends set up wireless resource control connection request time, forbid that described terminal accesses.

13. equipment according to claim 11, is characterized in that,

Described first transmitting element, for when described back haul link resource-constrained, sending that backhaul link resource is limited is indicated to terminal mobility management entity, to make described terminal mobility management entity when receiving the service request that terminal sends, forbidding that described terminal accesses;

And/or, sending that backhaul link resource is limited is indicated to general packet wireless service support node, to make described general packet wireless service support node when receiving the service request that terminal sends, forbidding that described terminal accesses.

14. equipment according to claim 11, is characterized in that,

Described first transmitting element, for when described back haul link resource-constrained, sends that backhaul link resource is limited is indicated to described relay station, broadcasts and forbid accessing message, forbid that described terminal accesses to make described relay station.

15. equipment according to claim 11 ~ 14 any one, is characterized in that,

Described first determining unit, having used the ratio of Resource Block quantity and up resources number of blocks for calculating shared channel on described back haul link, if described ratio reaches default threshold value, then having determined the resource-constrained of described back haul link.

16. 1 kinds of access control equipment, is characterized in that, comprising:

Second detecting unit, by the resource information of the back haul link detected between backhaul subscriber terminal equipment, described resource information comprises shared channel on described back haul link and has used Resource Block quantity and up resources number of blocks; And

Second determining unit, the resource information for detecting according to described second detecting unit determines that whether the resource of described back haul link is limited;

Second transmitting element, during for determining described back haul link resource-constrained in described second determining unit, sends the limited instruction of backhaul link resource to the network equipment and is used for forbidding that terminal accessed before carrying is set up;

Wherein, the described network equipment comprises: fast mobile terminal management entity.

17. equipment according to claim 16, is characterized in that,

Described second transmitting element, for when described back haul link resource-constrained, by sending the limited access point being indicated to described backhaul subscriber terminal equipment and binding of backhaul link resource through described backhaul subscriber terminal equipment, with make described access point receive terminal send set up wireless resource control connection request time, forbid that described terminal accesses.

18. equipment according to claim 16, is characterized in that,

Described second transmitting element, for when described back haul link resource-constrained, sending that backhaul link resource is limited is indicated to terminal mobility management entity, to make described terminal mobility management entity when receiving the service request that terminal sends, forbidding that described terminal accesses;

And/or, sending that backhaul link resource is limited is indicated to general packet wireless service support node, to make described general packet wireless service support node when receiving the service request that terminal sends, forbidding that described terminal accesses.

19. equipment according to claim 16, is characterized in that,

Described second transmitting element, for when described back haul link resource-constrained, by sending the limited access point being indicated to described backhaul subscriber terminal equipment and binding of backhaul link resource through described backhaul subscriber terminal equipment, broadcast to make described access point and forbid accessing message, forbid that terminal accesses.

20. equipment according to claim 16 ~ 19 any one, is characterized in that,

Described second determining unit, having used the ratio of Resource Block quantity and up resources number of blocks for calculating shared channel on described back haul link, if described ratio reaches default threshold value, then having determined the resource-constrained of described back haul link.

21. 1 kinds of access control systems, is characterized in that, comprise access control equipment and relay station:

Described access control equipment, for detecting the resource information of the back haul link between described relay station, this resource information comprises shared channel on back haul link and has used Resource Block quantity and up resources number of blocks; And whether limited according to the resource of the resource information determination back haul link of described back haul link, if so, then send that backhaul link resource is limited is indicated to described relay station;

Described relay station, for receive described access control equipment send the limited instruction of backhaul link resource, and receive terminal send set up wireless resource control connection request time, forbid that described terminal accesses.

22. 1 kinds of access control systems, is characterized in that, comprise the access point of access control equipment, backhaul subscriber terminal equipment and described backhaul subscriber terminal equipment binding;

Described access control equipment, for detecting the resource information of the back haul link between described backhaul subscriber terminal equipment, this resource information comprises shared channel on back haul link and has used Resource Block quantity and up resources number of blocks; And whether limited according to the resource of the resource information determination back haul link of described back haul link, if so, then send that backhaul link resource is limited is indicated to described backhaul subscriber terminal equipment;

Described backhaul subscriber terminal equipment, for receiving the limited instruction of backhaul link resource that described access control equipment sends, and sends to described access point by limited for described backhaul link resource instruction;

Described access point, for receive described backhaul subscriber terminal equipment send the limited instruction of backhaul link resource, and receive terminal send set up wireless resource control connection request time, forbid that described terminal accesses.