CN104936247B

CN104936247B - For the method for gravity treatment link terminal, base station and system

Info

Publication number: CN104936247B
Application number: CN201410103659.XA
Authority: CN
Inventors: 毕奇; 洪伟; 陈鹏; 韩斌
Original assignee: China Telecom Corp Ltd
Current assignee: China Telecom Corp Ltd
Priority date: 2014-03-20
Filing date: 2014-03-20
Publication date: 2019-04-23
Anticipated expiration: 2034-03-20
Also published as: CN104936247A

Abstract

The present invention discloses a kind of for the method for gravity treatment link terminal, base station and system.Wherein base station is when judging that user terminal needs gravity treatment link terminal, sends link terminal reselection message to user terminal, so that user terminal is to neighborhood broadcast relay request message；The relay candidate terminal of relay request message is received when judging that itself can forward data for user terminal, sends relaying received message to base station；Base station send relaying received message relay candidate terminal in select one as new link terminal；Base station sends relay connection to new link terminal and establishes message, establishes D2D with user terminal so as to new link terminal and communicates.Furthermore user terminal sends relaying to base station when judgement is without relay services and terminates request, and when receiving the relay services end message of base station transmission, user terminal is established with base station and is directly connected to, and is disconnected and being communicated with the D2D established between current hop terminal.So as to improve network covering property, user experience is improved.

Description

For the method for gravity treatment link terminal, base station and system

Technical field

It is the present invention relates to the communications field, in particular to a kind of for the method for gravity treatment link terminal, base station and system.

Background technique

With the rapid development of wireless communication technique, radio spectrum resources are more and more rare, but at the same time, user is to net The rate of network and the network coverage it is successional require it is higher and higher, therefore how in limited bandwidth resources realize high-speed and Wide covering becomes particularly significant for operator.3GPP(3rd Generation Partnership Project, the third generation Partner program) a kind of novel D2D(Device-to-Device, device-to-device are being discussed) communication technology.Pass through The technology avoids as shown in Figure 1, can directly be communicated under the control of base station between the mobile terminal being closer The forwarding of base station, to improve system effectiveness.

But the D2D technology that current 3GPP is discussed only simply is limited to a terminal and another terminal direct communication, The covering performance of network can not be improved, and the covering performance of network is particularly important for edge customer.

LTE(Long Term Evolution, long term evolution) relaying (Relay) node is introduced to promote covering for network Lid performance.The institute that the relay node has base station is functional, but dispose such relay node need to carry out addressing, cloth station, A series of work of expenses cumbersome and high for operator such as plant maintenance.

Trunk subscriber technology can also be further introduced into based on D2D technology to further increase the covering performance of network.And And avoid above-mentioned cumbersome work.But since trunk subscriber may move, it is thus possible to will cause the trunk subscriber no longer It is suitably for forwarding data by trunk subscriber, further results in the decline of D2D communication quality, and ultimately cause system performance decline.

Summary of the invention

The embodiment of the present invention provides a kind of for the method for gravity treatment link terminal, base station and system.User terminal with work as When the link-quality of preceding link terminal is deteriorated, by gravity treatment link terminal, network covering property can be improved, improve the user of user Experience.

According to an aspect of the present invention, a kind of method for gravity treatment link terminal is provided, comprising:

Base station sends link terminal reselection message to user terminal, so that the user terminal is receiving the relaying eventually It holds after reselection message to neighborhood broadcast relay request message, wherein the user terminal and current hop terminal establish equipment to setting Standby communication；

The base station receives the relaying received message from relay candidate terminal, wherein the relay candidate terminal is receiving To sending the relaying received message after the relay request message of the user terminal；

The base station selects new link terminal according to relaying received message；

The base station sends relay connection to the new link terminal and establishes message, so that the new link terminal is receiving Device-to-device is established with the user terminal after establishing message to the relay connection to communicate.

In one embodiment, after message is established to the new link terminal transmission relay connection in the base station, further includes:

The base station to current hop terminal send relay services end message, so as to current hop terminal disconnect with it is described The device-to-device of user terminal communicates.

In one embodiment, base station to user terminal send link terminal reselection message the step of include:

When judging that the user terminal needs gravity treatment link terminal, Xiang Suoshu user terminal sends relaying eventually for the base station Hold reselection message.

In one embodiment, relay candidate terminal is receiving the relay request message from the user terminal After the step of sending the relaying received message include:

Relay candidate terminal is after receiving the relay request message, and according to preset judgment criterion, judgement is certainly Whether body can forward data for the user terminal；

If data can be forwarded for the user terminal by judging itself, the relay candidate terminal is sent to the base station Relay received message.

In one embodiment, the base station includes: according to the step of relaying received message selection new link terminal

When the base station is received from the relaying received message of multiple candidate relay terminals, the base station is according in advance The Criterion of Selecting of setting selects a relay candidate terminal as new link terminal from the multiple relay candidate terminal.

In one embodiment, the base station is when judging that the user terminal needs gravity treatment link terminal, to the use Family terminal send link terminal reselection message the step of include:

The user terminal is judging itself wireless link signals intensity between current hop terminal lower than setting in advance When the relaying gravity treatment threshold value set and duration are more than pre-set relaying reselection time window, the base station Xiang Suoshu, which is sent, to be relayed Reselection request, wherein including the mark of the user terminal in relaying reselection request, the mark of current hop terminal, needing to relay Type of service, the wireless link signals intensity between the user terminal and current hop terminal, the speed of the user terminal The speed of degree, current hop terminal；

It is current according to the parameter and cell that include in relaying reselection request after the base station receives relaying reselection request Network state, judges whether the user terminal needs gravity treatment link terminal；

If judging, the user terminal needs gravity treatment link terminal, and the base station sends relaying eventually to the user terminal Hold reselection message.

Current hop terminal is judging itself wireless link signals intensity between the user terminal lower than setting in advance When the relaying gravity treatment threshold value set and duration are more than pre-set relaying reselection time window, the base station Xiang Suoshu, which is sent, to be relayed Reselection request, wherein including the mark of the user terminal in relaying reselection request, the mark of current hop terminal, needing to relay Type of service, the wireless link signals intensity between the user terminal and current hop terminal, the speed of the user terminal The speed of degree, current hop terminal；

Base station is judging itself wireless link signals intensity between current hop terminal lower than pre-set relaying When gravity treatment threshold value and duration are more than pre-set relaying reselection time window, Xiang Suoshu user terminal transmission link terminal Reselection message.

In one embodiment, the wireless link signals intensity between the user terminal and current hop equipment is only small When pre-set relaying gravity treatment threshold value, the Radio Link between the user terminal and current hop equipment just be will affect The service quality of teleservice；

Wireless link signals intensity between the base station and current hop equipment is only being less than pre-set relaying weight When selecting threshold value, the Radio Link between the base station and current hop equipment just will affect the Service Quality of teleservice Amount.

In one embodiment, the mark in relay request message including the user terminal, the service class for needing to relay The movement speed of type, the link signal strength of the user terminal and current hop terminal room, the user terminal.

In one embodiment, relay candidate terminal is after receiving the relay request message, according to preset Judgment criterion judges that the step of whether itself can forward data for the user terminal includes:

It is predetermined to judge whether itself battery capacity is greater than after receiving the relay request message for relay candidate terminal Electricity thresholding；

If the battery capacity of itself is greater than scheduled electricity thresholding, the relay candidate terminal judges that itself can be institute State user terminal forwarding data；And/or

It is predetermined to judge whether itself movement speed is less than after receiving the relay request message for relay candidate terminal Speed threshold；

If the movement speed of itself is less than scheduled speed threshold, the relay candidate terminal judges that itself can be institute State user terminal forwarding data；And/or

Relay candidate terminal judges the radio chains of itself and the user terminal after receiving the relay request message Whether road signal strength is greater than scheduled strength threshold；

If the wireless link signals intensity of itself and the user terminal is greater than scheduled strength threshold, the relaying is waited Terminal is selected to judge that itself can forward data for the user terminal.

In one embodiment, the mark for including the relay candidate terminal itself, the user are relayed in received message Link signal strength between the mark of terminal, the type of service, the relay candidate terminal and the user terminal that need to forward, Resource, the movement speed of the relay candidate terminal itself, the movement speed of the user terminal required for forwarding.

In one embodiment, the base station is according to preset Criterion of Selecting, in sending relaying received message After selecting a relay candidate terminal to include: as the step of new link terminal in candidate terminal

The base station is according to the parameter for including in relaying received message, in the relay candidate terminal for sending relaying received message It is middle to select the optimal relay candidate terminal of service quality as new link terminal.

In one embodiment, it includes resource, the new link terminal and institute needed for forwarding that relay connection, which is established in message, It states user terminal and establishes resource needed for device-to-device communicates.

In one embodiment, after the relay candidate terminal sends relaying received message to the base station, further includes:

The relay candidate terminal judge whether to receive in predetermined time range the base station sends it is described in Message is established after connection；

If not receiving the relay connection that the base station is sent in predetermined time range establishes message, described Relay candidate terminal is abandoned being relayed for the user terminal.

In one embodiment, the user terminal is judging itself the wireless link signals intensity between the base station Greater than pre-set user relaying threshold value and when the duration is more than pre-set termination relaying time window, Xiang Suoshu base Transmission relaying of standing terminates request；

When receiving relaying termination request, Xiang Suoshu user terminal sends relay services end message for the base station, with Toilet states user terminal and establishes the device-to-device for being directly connected to, and establishing between disconnection and current hop terminal with the base station Communication.

According to another aspect of the present invention, a kind of base station for gravity treatment link terminal, including transmission unit are provided, received Unit and selecting unit, in which:

Transmission unit, for sending link terminal reselection message to user terminal, so that the user terminal is receiving To neighborhood broadcast relay request message after the link terminal reselection message, wherein the user terminal is built with current hop terminal Vertical device-to-device communication；

Receiving unit, for receiving the relaying received message from relay candidate terminal, wherein relay candidate terminal is being connect The relaying received message is sent after receiving the relay request message from the user terminal；

Selecting unit, for selecting new link terminal according to relaying received message, and indicate transmission unit to it is described it is new in After terminal send relay connection establish message, so as to the new link terminal after receiving the relay connection and establishing message with The user terminal establishes device-to-device communication.

In one embodiment, transmission unit is also used to establishing message to the new link terminal transmission relay connection Afterwards, relay services end message is sent to current hop terminal, is set so that current hop terminal is disconnected with the user terminal It is standby to be communicated to equipment.

In one embodiment, above-mentioned base station further includes recognition unit, in which:

Recognition unit, for judging whether the user terminal needs gravity treatment link terminal, if judging the user terminal Gravity treatment link terminal is needed, then indicates that transmission unit sends link terminal reselection message to the user terminal.

In one embodiment, selecting unit specifically receives the relaying from multiple candidate relay terminals in receiving unit When received message, according to preset Criterion of Selecting, a relay candidate end is selected from the multiple relay candidate terminal End is used as new link terminal.

In one embodiment, recognition unit specifically receives the relaying gravity treatment from the user terminal in receiving unit After request, according to the parameter and cell current network state for including in relaying reselection request, whether the user terminal is judged Need gravity treatment link terminal；Wherein the user terminal is judging that itself wireless link signals between current hop terminal is strong Degree is lower than pre-set relaying gravity treatment threshold value and when the duration is more than pre-set relaying reselection time window, Xiang Suoshu Base station sends relaying reselection request, wherein including mark, the current hop terminal of the user terminal in relaying reselection request Mark needs wireless link signals intensity between the type of service, the user terminal and the current hop terminal that relay, is described Speed, the speed of current hop terminal of user terminal；

Transmission unit is also used to the judging result according to recognition unit, if judging, the user terminal needs gravity treatment relaying eventually End then sends link terminal reselection message to the user terminal.

In one embodiment, recognition unit specifically receives the relaying gravity treatment from current hop terminal in receiving unit After request, according to the parameter and cell current network state for including in relaying reselection request, whether the user terminal is judged Need gravity treatment link terminal；Wherein current hop terminal is judging that itself wireless link signals between the user terminal is strong Degree is lower than pre-set relaying gravity treatment threshold value and when the duration is more than pre-set relaying reselection time window, Xiang Suoshu Base station sends relaying reselection request, wherein including mark, the current hop terminal of the user terminal in relaying reselection request Mark needs wireless link signals intensity between the type of service, the user terminal and the current hop terminal that relay, is described Speed, the speed of current hop terminal of user terminal；

In one embodiment, recognition unit is judging the wireless link signals between base station itself and current hop terminal Intensity is lower than pre-set relaying gravity treatment threshold value and when the duration is more than pre-set relaying reselection time window, instruction Transmission unit sends link terminal reselection message to the user terminal.

In one embodiment, selecting unit connects with specific reference to the parameter for including in relaying received message sending relaying By selected in the relay candidate terminal of message the optimal relay candidate terminal of service quality as new link terminal.

In one embodiment, transmission unit is also used to when receiving unit receives relaying and terminates request, to the use Family terminal sends relay services end message, establishes and is directly connected to the base station so as to the user terminal, and disconnects and work as The device-to-device communication established between preceding link terminal；Wherein the user terminal is judging itself between the base station Wireless link signals intensity is greater than pre-set user relaying threshold value and the duration relays more than pre-set termination When time window, the base station Xiang Suoshu sends relaying and terminates request.

According to another aspect of the present invention, a kind of system for gravity treatment link terminal, including base station, user's end are provided End, current hop terminal and relay candidate terminal, in which:

Base station connects for sending link terminal reselection message to user terminal according to the relaying from relay candidate terminal New link terminal is selected by message, relay connection is sent to the new link terminal and establishes message；

User terminal, for being asked after receiving the link terminal reselection message from the base station to neighborhood broadcast relay Seek message；

Current hop terminal is communicated for establishing device-to-device with the user terminal；

Relay candidate terminal receives for sending relaying after receiving the relay request message from the user terminal Message；After receiving the relay connection from the base station and establishing message, it is logical that device-to-device is established with the user terminal Letter.

In one embodiment, base station is the base station that any of the above-described embodiment is related to.

In one embodiment, current hop terminal is also used to terminate to disappear in the relay services for receiving the base station transmission After breath, disconnection is communicated with the device-to-device of the user terminal.

In one embodiment, relay candidate terminal is specifically after receiving the relay request message, according to setting in advance Fixed judgment criterion, judges whether itself can forward data for the user terminal；If judging, itself can be the user Terminal forwards data, then sends relaying received message to the base station.

In one embodiment, the user terminal is specifically judging itself Radio Link between current hop terminal Signal strength is lower than pre-set relaying gravity treatment threshold value and when the duration is more than pre-set relaying reselection time window, Relaying reselection request is sent to the base station, wherein including mark, the current hop of the user terminal in relaying reselection request Wireless link signals between the mark of terminal, the type of service, the user terminal and the current hop terminal that need to relay are strong Degree, the speed of the user terminal, the speed of current hop terminal.

In one embodiment, current hop terminal is specifically judging itself Radio Link between the user terminal Signal strength is lower than pre-set relaying gravity treatment threshold value and when the duration is more than pre-set relaying reselection time window, Relaying reselection request is sent to the base station, wherein including mark, the current hop of the user terminal in relaying reselection request Wireless link signals between the mark of terminal, the type of service, the user terminal and the current hop terminal that need to relay are strong Degree, the speed of the user terminal, the speed of current hop terminal.

In one embodiment, relay candidate terminal judges itself specifically after receiving the relay request message Whether battery capacity is greater than scheduled electricity thresholding；If the battery capacity of itself is greater than scheduled electricity thresholding, itself is judged Data can be forwarded for the user terminal；And/or after receiving the relay request message, the movement speed of itself is judged Whether scheduled speed threshold is less than；If the movement speed of itself is less than scheduled speed threshold, judge that itself can be institute State user terminal forwarding data；And/or after receiving the relay request message, the nothing of itself and the user terminal is judged Whether wired link signal strength is greater than scheduled strength threshold；If itself is big with the wireless link signals intensity of the user terminal In scheduled strength threshold, then judge that itself can forward data for the user terminal.

In one embodiment, the relay candidate terminal be also used to the base station send relaying received message it Afterwards, judge whether that receiving the relay connection that the base station is sent in predetermined time range establishes message；If not existing The relay connection that the base station is sent is received in scheduled time range and establishes message, then is abandoned as the user terminal It is relayed.

In one embodiment, the user terminal is also used to judging itself Radio Link letter between the base station Number intensity is greater than pre-set user and relays threshold value and when the duration is more than pre-set termination relaying time window, to The base station sends relaying and terminates request；

The base station is also used to when receiving relaying termination request, and Xiang Suoshu user terminal, which sends relay services, to be terminated to disappear Breath is established with the base station so as to the user terminal and is directly connected to, and disconnects the equipment established between current hop terminal It is communicated to equipment.

The present invention is by when user terminal current hop terminal service quality is unable to get guarantee, being user terminal gravity treatment Link terminal improves the user experience of user so as to improve network covering property.

Detailed description of the invention

In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art To obtain other drawings based on these drawings.

Fig. 1 is the schematic diagram that device-to-device communicates one embodiment in the prior art.

Fig. 2 is schematic diagram of the present invention for method one embodiment of gravity treatment link terminal.

Fig. 3 is schematic diagram of the present invention for another embodiment of method of gravity treatment link terminal.

Fig. 4 is schematic diagram of the present invention for base station one embodiment of gravity treatment link terminal.

Fig. 5 is schematic diagram of the present invention for another embodiment in base station of gravity treatment link terminal.

Fig. 6 is schematic diagram of the present invention for system one embodiment of gravity treatment link terminal.

Fig. 7a-7c is the schematic diagram of link terminal gravity treatment one embodiment of the present invention.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Below Description only actually at least one exemplary embodiment be it is illustrative, never as to the present invention and its application or make Any restrictions.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise Under every other embodiment obtained, shall fall within the protection scope of the present invention.

Unless specifically stated otherwise, positioned opposite, the digital table of the component and step that otherwise illustrate in these embodiments It is not limited the scope of the invention up to formula and numerical value.

Simultaneously, it should be appreciated that for ease of description, the size of various pieces shown in attached drawing is not according to reality Proportionate relationship draw.

Technology, method and apparatus known to person of ordinary skill in the relevant may be not discussed in detail, but suitable In the case of, the technology, method and apparatus should be considered as authorizing part of specification.

It is shown here and discuss all examples in, any occurrence should be construed as merely illustratively, without It is as limitation.Therefore, the other examples of exemplary embodiment can have different values.

It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi It is defined in a attached drawing, then in subsequent attached drawing does not need that it is further discussed.

Fig. 2 is schematic diagram of the present invention for method one embodiment of gravity treatment link terminal.Wherein:

Step 201, base station sends link terminal reselection message to user terminal, so that the user terminal is receiving It states after link terminal reselection message to neighborhood broadcast relay request message.

Wherein the user terminal and the foundation of current hop terminal have device-to-device communication.

Preferably, the base station is when judging that the user terminal needs gravity treatment link terminal, Xiang Suoshu user terminal hair Send link terminal reselection message.

Step 202, the base station receives the relaying received message from relay candidate terminal, wherein the relay candidate is whole End sends the relaying received message after receiving the relay request message from the user terminal.

Preferably, relay candidate terminal is after receiving the relay request message, according to preset judgment criterion, Judge whether itself can forward data for the user terminal.If data can be forwarded for the user terminal by judging itself, Then the relay candidate terminal sends relaying received message to the base station.

Step 203, the base station selects new link terminal according to relaying received message.

Preferably, when the base station is received from the relaying received message of multiple candidate relay terminals, the base station According to preset Criterion of Selecting, select a relay candidate terminal as new relaying from the multiple relay candidate terminal Terminal.

Step 204, the base station sends relay connection to the new link terminal and establishes message, eventually so as to the new relaying End is established device-to-device with the user terminal after receiving the relay connection and establishing message and is communicated.

Preferably, after message is established to the new link terminal transmission relay connection in the base station, further includes:

The base station to current hop terminal send relay services end message, so as to current hop terminal disconnect with it is described The device-to-device of user terminal communicates.That is, new link terminal is provided as new current hop terminal for the user terminal Relay services.

Based on the method for gravity treatment link terminal that the above embodiment of the present invention provides, by user terminal is current When terminal service quality is unable to get guarantee, mentioned for user terminal gravity treatment link terminal so as to improve network covering property The user experience of high user.

Fig. 3 is schematic diagram of the present invention for another embodiment of method of gravity treatment link terminal.Wherein:

Step 301, when judging that user terminal needs gravity treatment link terminal, Xiang Suoshu user terminal sends relaying eventually for base station Hold reselection message.Wherein the user terminal passes through current hop terminal to the base station forwarding service.

Preferably, link terminal reselection message can pass through L1, MAC(Media Access Control, media interviews control System) CE (Control Element, control unit) or RRC(Radio Resource Control, wireless heterogeneous networks) signaling It is sent.

Judge whether user terminal needs gravity treatment to relay, can be sentenced by user terminal, current hop terminal or base station It is disconnected.It is specific as follows:

In one embodiment, the user terminal is judging itself wireless link signals between current hop terminal Intensity is lower than pre-set relaying gravity treatment threshold value and when the duration is more than pre-set relaying reselection time window, to institute It states base station and sends relaying reselection request, wherein including mark, the current hop terminal of the user terminal in relaying reselection request Mark, need wireless link signals intensity between the type of service, the user terminal and the current hop terminal that relay, institute State the speed of user terminal, the speed of current hop terminal.

It is current according to the parameter and cell that include in relaying reselection request after the base station receives relaying reselection request Network state, judges whether the user terminal needs gravity treatment link terminal.If judging, the user terminal needs gravity treatment to relay Terminal, then the base station sends link terminal reselection message to the user terminal.

In another embodiment, current hop terminal is judging itself wireless link signals between the user terminal Intensity is lower than pre-set relaying gravity treatment threshold value and when the duration is more than pre-set relaying reselection time window, to institute It states base station and sends relaying reselection request, wherein including mark, the current hop terminal of the user terminal in relaying reselection request Mark, need wireless link signals intensity between the type of service, the user terminal and the current hop terminal that relay, institute State the speed of user terminal, the speed of current hop terminal.

In another embodiment, base station is judging that itself wireless link signals intensity between current hop terminal is lower than When pre-set relaying gravity treatment threshold value and duration are more than pre-set relaying reselection time window, Xiang Suoshu user's end End sends link terminal reselection message.

Preferably, can be believed among the above by base station broadcast or the RRC of unicast after gravity treatment threshold value and relaying reselection time window Order is configured.

What needs to be explained here is that can guarantee that Radio Link Failure (Radio does not occur for user after gravity treatment threshold value among the above Link Failure, referred to as: RLF), the QoS(Quality of Service of customer service, service quality will not be influenced). That is, the wireless link signals intensity between the user terminal and current hop equipment is only being less than in pre-set When gravity treatment threshold value, the Radio Link between the user terminal and current hop equipment just will affect teleservice Service quality, or even Radio Link Failure occurs.Wireless link signals intensity between the base station and current hop equipment is only When being less than pre-set relaying gravity treatment threshold value, the Radio Link between the base station and current hop equipment just be will affect The service quality of teleservice, or even Radio Link Failure occurs.It can before user is broken in service to can ensure that Complete relaying gravity treatment.

Step 302, the user terminal disappears after receiving link terminal reselection message to the request of neighborhood broadcast relay Breath.

Preferably, relay request message can be broadcasted by L1, RRC signaling.

Preferably, the mark in relay request message including the user terminal, the type of service, the use that need to relay The movement speed of the link signal strength of family terminal and current hop terminal room, the user terminal.

Step 303, relay candidate terminal, according to preset judgment criterion, is sentenced after receiving relay request message Whether break itself can forward data for the user terminal.

For example, after receiving relay request message, to judge whether itself battery capacity is greater than pre- for relay candidate terminal Fixed electricity thresholding.If the battery capacity of itself is greater than scheduled electricity thresholding, the relay candidate terminal judges itself energy Enough data are forwarded for the user terminal.

In another example relay candidate terminal after receiving relay request message, judges whether the movement speed of itself is less than Scheduled speed threshold.If the movement speed of itself is less than scheduled speed threshold, the relay candidate terminal judges itself Data can be forwarded for the user terminal.

In another example relay candidate terminal after receiving relay request message, judges the nothing of itself and the user terminal Whether wired link signal strength is greater than scheduled strength threshold.If itself is big with the wireless link signals intensity of the user terminal In scheduled strength threshold, then the relay candidate terminal judges that itself can forward data for the user terminal.

Preferably, any form of combination can be carried out to above-mentioned judgement.

In addition, no matter relay candidate terminal is in idle condition (IDLE) or connection status (CONNECTED), each may participate in Above-mentioned judgement.

It step 304, itself can be user terminal forwarding data if judging, the relay candidate terminal is to described Base station sends relaying received message.

Preferably, relaying received message can be sent by L1, MAC CE or RRC signaling.

Preferably, relay include in received message the mark of the relay candidate terminal itself, the user terminal mark Needed for link signal strength, forwarding between knowledge, the type of service, the relay candidate terminal and the user terminal that need to forward Movement speed, the movement speed of the user terminal of the resource, the relay candidate terminal itself wanted.

Step 305, the base station is whole in the relay candidate for sending relaying received message according to preset Criterion of Selecting Select a relay candidate terminal as new link terminal in end.

Preferably, the base station according to relaying received message in include parameter, such as relay candidate terminal electricity, move Link between dynamic link signal strength, relay candidate terminal and base station between speed, relay candidate terminal and user terminal Signal strength etc. selects a service quality optimal relay candidate end in the relay candidate terminal for sending relaying received message End is used as new link terminal.

Step 306, the base station sends relay connection to the new link terminal and establishes message, eventually so as to the new relaying End is established device-to-device with the user terminal and is communicated, and the user terminal is turned by the new link terminal to the base station Sending service.

Preferably, the base station also sends relay services end message to the current hop terminal of the user terminal, with Link terminal disconnection is communicated with the device-to-device of the user terminal before box lunch.

Preferably, it includes that resource, the new link terminal needed for forwarding and the user are whole that relay connection, which is established in message, Resource needed for device-to-device communicates is established at end.

Preferably, after the relay candidate terminal sends relaying received message to the base station, further includes:

The relay candidate terminal judge whether to receive in predetermined time range the base station sends it is described in Message is established after connection.If not receiving the relay connection foundation that the base station is sent in predetermined time range to disappear Breath, then the relay candidate terminal is abandoned being relayed for the user terminal.

That is, if not receiving the confirmation of base station in the given time, then it is assumed that oneself is not selected.

Preferably, the user terminal is also judging that it is pre- that itself wireless link signals intensity between the base station is greater than The user that is first arranged relays threshold value and when the duration is more than pre-set terminations relaying time window, the transmission of the base station Xiang Suoshu Relaying terminates request.

That is, if the condition that is directly communicated between user terminal and base station meets, user terminal cancel with The D2D connection of link terminal, then use common communication mode.

Fig. 4 is schematic diagram of the present invention for base station one embodiment of gravity treatment link terminal.As shown in figure 4, base station can Including transmission unit 401, receiving unit 402 and selecting unit 403.Wherein:

Transmission unit 401, for sending link terminal reselection message to user terminal, so that the user terminal is receiving To neighborhood broadcast relay request message after to the link terminal reselection message, wherein the user terminal and current hop terminal Establish device-to-device communication.

Receiving unit 402, for receiving the relaying received message from relay candidate terminal, wherein relay candidate terminal exists The relaying received message is sent after receiving the relay request message from the user terminal.

Selecting unit 403 for selecting new link terminal according to relaying received message, and indicates transmission unit 401 to institute It states new link terminal and sends relay connection and establish message, so that the new link terminal disappears receiving the relay connection foundation Device-to-device is established with the user terminal after breath to communicate.

Based on the base station for gravity treatment link terminal that the above embodiment of the present invention provides, by user terminal is current When terminal service quality is unable to get guarantee, mentioned for user terminal gravity treatment link terminal so as to improve network covering property The user experience of high user.

Preferably, transmission unit 401 is also used to after sending relay connection to the new link terminal and establishing message, to working as Preceding link terminal sends relay services end message, so that current hop terminal disconnects the device-to-device with the user terminal Communication.

Fig. 5 is schematic diagram of the present invention for another embodiment in base station of gravity treatment link terminal.With embodiment illustrated in fig. 4 phase Than in the embodiment shown in fig. 5, base station may also include recognition unit 501.Wherein:

Recognition unit 501, for judging whether the user terminal needs gravity treatment link terminal, if judging, the user is whole End needs gravity treatment link terminal, then indicates that transmission unit sends link terminal reselection message to the user terminal.

Preferably, selecting unit 403 specifically receives the relaying from multiple candidate relay terminals in receiving unit and receives When message, according to preset Criterion of Selecting, a relay candidate terminal is selected to make from the multiple relay candidate terminal For new link terminal.

Preferably, recognition unit 501 specifically receives the relaying gravity treatment from the user terminal in receiving unit 402 and asks After asking, according to the parameter and cell current network state for including in relaying reselection request, judge whether the user terminal needs Want gravity treatment link terminal.Wherein the user terminal is judging itself the wireless link signals intensity between current hop terminal Lower than pre-set relaying gravity treatment threshold value and when the duration is more than pre-set relaying reselection time window, Xiang Suoshu base Transmission of standing relays reselection request, wherein including the mark of the mark of the user terminal, current hop terminal in relaying reselection request Know, the wireless link signals intensity between type of service, the user terminal and the current hop terminal that needs relay, the use Speed, the speed of current hop terminal of family terminal.

Transmission unit 401 is also used to the judging result according to recognition unit 501, if judging, the user terminal needs gravity treatment Link terminal then sends link terminal reselection message to the user terminal.

Preferably, recognition unit 501 specifically receives the relaying gravity treatment from current hop terminal in receiving unit 402 and asks After asking, according to the parameter and cell current network state for including in relaying reselection request, judge whether the user terminal needs Want gravity treatment link terminal；Wherein current hop terminal is judging itself the wireless link signals intensity between the user terminal Lower than pre-set relaying gravity treatment threshold value and when the duration is more than pre-set relaying reselection time window, Xiang Suoshu base Transmission of standing relays reselection request, wherein including the mark of the mark of the user terminal, current hop terminal in relaying reselection request Know, the wireless link signals intensity between type of service, the user terminal and the current hop terminal that needs relay, the use Speed, the speed of current hop terminal of family terminal.

Preferably, recognition unit 501 is judging the wireless link signals intensity between base station itself and current hop terminal Lower than pre-set relaying gravity treatment threshold value and when the duration is more than pre-set relaying reselection time window, instruction is sent Unit 401 sends link terminal reselection message to the user terminal.

Preferably, the wireless link signals intensity between the user terminal and current hop equipment is only in advance set being less than When the relaying gravity treatment threshold value set, the Radio Link between the user terminal and current hop equipment just will affect user terminal The service quality of business, or even Radio Link Failure occurs.

Wireless link signals intensity between the base station and current hop equipment is only being less than pre-set relaying weight When selecting threshold value, the Radio Link between the base station and current hop equipment just will affect the Service Quality of teleservice Amount, or even Radio Link Failure occurs.

To be impacted to user using new link terminal.

Preferably, selecting unit 403 relays received message sending with specific reference to the parameter for including in relaying received message Relay candidate terminal in select the optimal relay candidate terminal of service quality as new link terminal.

Preferably, transmission unit 401 is also used to when receiving unit 402 receives relaying and terminates request, Xiang Suoshu user Terminal sends relay services end message, establishes and is directly connected to so as to the user terminal and the base station, and disconnect with currently The device-to-device communication established between link terminal.Wherein the user terminal is judging itself nothing between the base station Wired link signal strength is greater than pre-set user relaying threshold value and when the duration is more than that pre-set termination relays Between window when, the base station Xiang Suoshu send relaying terminate request.

Fig. 6 is schematic diagram of the present invention for system one embodiment of gravity treatment link terminal.As shown in fig. 6, in base station Multiple user terminals are populated in 601 affiliated subdistricts, wherein user terminal 602 is connect with link terminal 603 using D2D, that is, is used Family terminal 302 passes through link terminal 303 to 601 forwarding service of base station.Wherein:

Base station 601, for sending link terminal reselection message to user terminal 602, according to from relay candidate terminal The relaying received message of 604-605 selects new link terminal, sends relay connection to the new link terminal and establishes message.

User terminal 602, for being broadcasted after receiving the link terminal reselection message from the base station 601 to neighborhood Relay request message.

Current hop terminal 603 is communicated for establishing device-to-device with the user terminal 602.

Relay candidate terminal 604-605, for being sent after receiving the relay request message from the user terminal Relay received message；After receiving the relay connection from the base station and establishing message, equipment is established with the user terminal It is communicated to equipment.

Based on the system for gravity treatment link terminal that the above embodiment of the present invention provides, by user terminal is current When terminal service quality is unable to get guarantee, mentioned for user terminal gravity treatment link terminal so as to improve network covering property The user experience of high user.

For brevity, two relay candidate terminals are only gived in Fig. 6, those skilled in the art are scrutable It is may exist multiple relay candidate terminals in cell.

In one embodiment, base station is the base station that any embodiment is related in Fig. 4 or Fig. 5.

Preferably, current hop terminal 603 is also used in the relay services end message for receiving the transmission of base station 601 Afterwards, it disconnects and being communicated with the device-to-device of the user terminal.

Preferably, relay candidate terminal 604-605 is specifically after receiving the relay request message, according to presetting Judgment criterion, judge itself whether can be the user terminal forwarding data；If judging, itself can be whole for the user End forwarding data, then send relaying received message to the base station 601.

Preferably, the user terminal 602 is specifically judging itself Radio Link letter between current hop terminal 603 Number intensity is lower than pre-set relaying gravity treatment threshold value and when the duration is more than pre-set relaying reselection time window, to The base station 601 sends relaying reselection request, wherein including mark, the current hop of the user terminal in relaying reselection request Wireless link signals between the mark of terminal, the type of service, the user terminal and the current hop terminal that need to relay are strong Degree, the speed of the user terminal, the speed of current hop terminal.

Preferably, current hop terminal 603 is specifically judging itself Radio Link letter between the user terminal 602 Number intensity is lower than pre-set relaying gravity treatment threshold value and when the duration is more than pre-set relaying reselection time window, to The base station 601 sends relaying reselection request, wherein including mark, the current hop of the user terminal in relaying reselection request Wireless link signals between the mark of terminal, the type of service, the user terminal and the current hop terminal that need to relay are strong Degree, the speed of the user terminal, the speed of current hop terminal.

Preferably, relay candidate terminal 604-605 judges the electricity of itself specifically after receiving the relay request message Whether pond electricity is greater than scheduled electricity thresholding；If the battery capacity of itself is greater than scheduled electricity thresholding, itself energy is judged Enough data are forwarded for the user terminal；And/or after receiving the relay request message, judge that the movement speed of itself is It is no to be less than scheduled speed threshold；If the movement speed of itself is less than scheduled speed threshold, judge itself can be described User terminal forwards data；And/or after receiving the relay request message, judge that itself is wireless with the user terminal Whether link signal strength is greater than scheduled strength threshold；If the wireless link signals intensity of itself and the user terminal is greater than Scheduled strength threshold then judges that itself can forward data for the user terminal.

Preferably, the relay candidate terminal 604-605 is also used to after sending relaying received message to the base station, Judge whether that receiving the relay connection that the base station is sent in predetermined time range establishes message；If not predetermined Time range in receive the relay connection that the base station is sent and establish message, then abandon as user terminal progress Relaying.

Preferably, the user terminal 602 is also used to judging that itself wireless link signals between the base station is strong When degree is greater than pre-set user relaying threshold value and duration more than pre-set termination relaying time window, Xiang Suoshu Base station 601 sends relaying and terminates request.

The base station 601 is also used to when receiving relaying termination request, and Xiang Suoshu user terminal 602 sends relay services End message is established so as to the user terminal 602 and the base station 601 and is directly connected to, and disconnects user terminal 602 and current The device-to-device communication established between link terminal 603.

Below by specific example, the present invention will be described.As shown in Figure 7a, at first moment, user 2 as with The trunk subscriber at family 1 for user 1 forward the data to base station.

Step 1: at the second moment, as shown in Figure 7b, since user 2 is mobile, become larger with 1 distance of user, therebetween D2D link-quality is deteriorated, and when being lower than a threshold value (Threshold) and being more than regular hour (T), user 2 sends out to base station " relaying reselection request " signaling is sent, content includes active user-relaying (U-R) link-quality, 2 movement speed of user etc.. Threshold configure or by broadcast by the RRC signaling of unicast by base station with T when establishing D2D and connecting RRC signaling is configured.

Step 2: after base station receives the demand signalling, triggering carries out trunk subscriber gravity treatment by trunk subscriber.

Step 3: after finding new trunk subscriber 3, base station can send " relay services terminate " signaled original relaying and use Family 2 disconnect and it is former is connected by the D2D of trunk subscriber 1, and send the new trunk subscriber 3 of " relay connection foundation " signaled and by New D2D connection is established after user 1.

Step 4: at the third moment, as shown in Figure 7 c, the D2D link-quality between user 1 and user 3 is compared with user 1 and base station Between link-quality it is poor, user 1 sends " relaying terminate request " to base station, and base station confirmation disconnects D2D connection, then uses traditional Mode communicates.

By applying the present invention, it is available following the utility model has the advantages that

1, trunk subscriber, trunk subscriber gravity treatment can be triggered according to certain criterion by trunk subscriber and base station, guarantee The stability of service.

2, trunk subscriber can be triggered according to certain criterion by trunk subscriber and terminates request, guaranteed by trunk subscriber performance body It tests.

3, there is control ability in base station to user's relay selection and termination procedure, guarantees the stabilization and performance of system.

4, the present invention does not need the traditional relay node of operator deployment, to save the expense and work of operator Amount.

Those of ordinary skill in the art will appreciate that realizing that all or part of the steps of above-described embodiment can pass through hardware It completes, relevant hardware can also be instructed to complete by program, the program can store in a kind of computer-readable In storage medium, storage medium mentioned above can be read-only memory, disk or CD etc..

Description of the invention is given for the purpose of illustration and description, and is not exhaustively or will be of the invention It is limited to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.It selects and retouches It states embodiment and is to more preferably illustrate the principle of the present invention and practical application, and those skilled in the art is enable to manage The solution present invention is to design various embodiments suitable for specific applications with various modifications.

Claims

1. a method of for gravity treatment link terminal characterized by comprising

Base station sends link terminal reselection message when judging that user terminal needs gravity treatment link terminal, to user terminal, so as to The user terminal after receiving the link terminal reselection message to neighborhood broadcast relay request message, wherein the user Terminal is established device-to-device with current hop terminal and is communicated；

The base station receives the relaying received message from relay candidate terminal, wherein the relay candidate terminal is receiving The relaying received message is sent from after the relay request message of the user terminal；

The base station sends relay connection to the new link terminal and establishes message, so that the new link terminal is receiving It states relay connection and establishes after message and establish device-to-device with the user terminal and communicate；

Wherein, when judging that the user terminal needs gravity treatment link terminal, Xiang Suoshu user terminal sends relaying for the base station Terminal reselection message includes:

The user terminal is judging itself wireless link signals intensity between current hop terminal lower than pre-set When relaying gravity treatment threshold value and duration and being more than pre-set relaying reselection time window, the base station Xiang Suoshu, which is sent, relays gravity treatment Request, wherein including the mark, the mark of current hop terminal, the industry for needing to relay of the user terminal in relaying reselection request The speed of wireless link signals intensity, the user terminal between service type, the user terminal and current hop terminal and The speed of current hop terminal；

After the base station receives relaying reselection request, according to the parameter and cell current network for including in relaying reselection request State, judges whether the user terminal needs gravity treatment link terminal；

If judging, the user terminal needs gravity treatment link terminal, and the base station sends link terminal weight to the user terminal Select message.

2. the method according to claim 1, wherein

After message is established to the new link terminal transmission relay connection in the base station, further includes:

The base station sends relay services end message to current hop terminal, so that current hop terminal disconnects and the user The device-to-device of terminal communicates.

3. the method according to claim 1, wherein

Relay candidate terminal sends the relaying after receiving the relay request message from the user terminal and receives The step of message includes:

Relay candidate terminal is after receiving the relay request message, according to preset judgment criterion, judges that itself is It is no to forward data for the user terminal；

If data can be forwarded for the user terminal by judging itself, the relay candidate terminal sends to the base station and relays Received message.

4. the method according to claim 1, wherein

The base station includes: according to the step of relaying received message selection new link terminal

When the base station is received from the relaying received message of multiple relay candidate terminals, the base station is according to presetting Criterion of Selecting, select a relay candidate terminal as new link terminal from the multiple relay candidate terminal.

5. the method according to claim 1, wherein

When judging that the user terminal needs gravity treatment link terminal, Xiang Suoshu user terminal sends link terminal weight for the base station The step of selecting message include:

Current hop terminal is judging itself wireless link signals intensity between the user terminal lower than pre-set When relaying gravity treatment threshold value and duration and being more than pre-set relaying reselection time window, the base station Xiang Suoshu, which is sent, relays gravity treatment Request, wherein including the mark, the mark of current hop terminal, the industry for needing to relay of the user terminal in relaying reselection request The speed of wireless link signals intensity, the user terminal between service type, the user terminal and current hop terminal, when The speed of preceding link terminal；

6. the method according to claim 1, wherein

When judging that the user terminal needs gravity treatment link terminal, Xiang Suoshu user terminal sends link terminal weight for the base station The step of selecting message further include:

Base station is judging itself wireless link signals intensity between current hop terminal lower than pre-set relaying gravity treatment When threshold value and duration are more than pre-set relaying reselection time window, the transmission link terminal gravity treatment of Xiang Suoshu user terminal Message.

7. method according to claim 1 to 6, which is characterized in that

Wireless link signals intensity between the user terminal and current hop equipment is only being less than pre-set relaying weight When selecting threshold value, the Radio Link between the user terminal and current hop equipment just will affect the service of teleservice Quality；

Wireless link signals intensity between the base station and current hop equipment is only being less than pre-set relaying gravity treatment door When limit value, the Radio Link between the base station and current hop equipment just will affect the service quality of teleservice.

8. according to the method described in claim 3, it is characterized in that,

Include the mark of the user terminal in relay request message, need the type of service relayed, the user terminal and work as The movement speed of link signal strength, the user terminal between preceding link terminal.

9. according to the method described in claim 8, it is characterized in that,

Relay candidate terminal is after receiving the relay request message, according to preset judgment criterion, judges that itself is It is no to include: for the step of user terminal forwarding data

Relay candidate terminal judges whether the battery capacity of itself is greater than scheduled electricity after receiving the relay request message Measure thresholding；

If the battery capacity of itself is greater than scheduled electricity thresholding, the relay candidate terminal judges that itself can be the use Family terminal forwards data；And/or

Relay candidate terminal judges whether the movement speed of itself is less than scheduled speed after receiving the relay request message Spend thresholding；

If the movement speed of itself is less than scheduled speed threshold, the relay candidate terminal judges that itself can be the use Family terminal forwards data；And/or

Relay candidate terminal judges that the Radio Link of itself and the user terminal is believed after receiving the relay request message Whether number intensity is greater than scheduled strength threshold；

If the wireless link signals intensity of itself and the user terminal is greater than scheduled strength threshold, the relay candidate is whole End judges that itself can forward data for the user terminal.

10. according to the method described in claim 4, it is characterized in that,

Include the mark of the relay candidate terminal itself in relaying received message, the mark of the user terminal, need to forward Type of service, the link signal strength between the relay candidate terminal and the user terminal, resource, institute required for forwarding State the movement speed of relay candidate terminal itself, the movement speed of the user terminal.

11. according to the method described in claim 10, it is characterized in that,

The base station selects one according to preset Criterion of Selecting in the relay candidate terminal for sending relaying received message Relay candidate terminal includes: as the step of new link terminal

It is selected in the relay candidate terminal for sending relaying received message according to the parameter for including in relaying received message the base station The optimal relay candidate terminal of service quality is selected as new link terminal.

12. the method according to claim 1, wherein

It includes that resource, the new link terminal needed for forwarding are established equipment with the user terminal and arrived that relay connection, which is established in message, Resource needed for equipment communicates.

13. the method according to claim 1, wherein

The relay candidate terminal is sent to the base station after relaying received message, further includes:

The relay candidate terminal judges whether that receiving the relaying that the base station is sent in predetermined time range connects It connects and establishes message；

If not receiving the relay connection that the base station is sent in predetermined time range establishes message, the relaying Candidate terminal is abandoned being relayed for the user terminal.

14. the method according to claim 1, wherein further include:

The user terminal is judging that itself wireless link signals intensity between the base station is greater than pre-set user When relaying threshold value and duration and being more than pre-set terminations relaying time window, the base station Xiang Suoshu sends relaying termination and asks It asks；

When receiving relaying termination request, Xiang Suoshu user terminal sends relay services end message, with toilet for the base station It states user terminal to be directly connected to base station foundation, and it is logical to disconnect the device-to-device established between current hop terminal Letter.

15. a kind of base station for gravity treatment link terminal, which is characterized in that including recognition unit, transmission unit, receiving unit and Selecting unit, in which:

Recognition unit, for judging whether user terminal needs gravity treatment link terminal, if judging, the user terminal needs gravity treatment Link terminal then indicates that transmission unit sends link terminal reselection message to the user terminal；Wherein received in receiving unit To after the relaying reselection request of the user terminal, according to the parameter and the current net of cell for including in relaying reselection request Network state, judges whether the user terminal needs gravity treatment link terminal；Wherein the user terminal judge itself and it is current Wireless link signals intensity between link terminal is lower than pre-set relaying gravity treatment threshold value and the duration is more than preparatory When the relaying reselection time window of setting, the base station Xiang Suoshu sends relaying reselection request, wherein including described in relaying reselection request Mark, the mark of current hop terminal, the type of service for needing to relay, the user terminal and the current hop end of user terminal The speed of wireless link signals intensity, the user terminal between end and the speed of current hop terminal；

Transmission unit, for sending link terminal reselection message to user terminal, so as to the user terminal receive it is described To neighborhood broadcast relay request message after link terminal reselection message, wherein the user terminal is set with the foundation of current hop terminal It is standby to be communicated to equipment；It is also used to the judging result according to recognition unit, if judging, the user terminal needs gravity treatment link terminal, Then link terminal reselection message is sent to the user terminal；

Receiving unit, for receiving the relaying received message from relay candidate terminal, wherein relay candidate terminal is being received The relaying received message is sent after the relay request message from the user terminal；

Selecting unit for selecting new link terminal according to relaying received message, and indicates transmission unit to the new relaying eventually End send relay connection establish message, so as to the new link terminal after receiving the relay connection and establishing message with it is described User terminal establishes device-to-device communication.

16. base station according to claim 15, which is characterized in that

Transmission unit is also used to after sending relay connection to the new link terminal and establishing message, is sent to current hop terminal Relay services end message, so that the disconnection of current hop terminal is communicated with the device-to-device of the user terminal.

17. base station according to claim 15, which is characterized in that

Selecting unit is specifically when receiving unit is received from the relaying received message of multiple relay candidate terminals, according to preparatory The Criterion of Selecting of setting selects a relay candidate terminal as new link terminal from the multiple relay candidate terminal.

18. base station according to claim 15, which is characterized in that

Recognition unit is specifically after receiving unit receives the relaying reselection request from current hop terminal, according to relaying gravity treatment The parameter and cell current network state for including in request, judge whether the user terminal needs gravity treatment link terminal；Its Middle current hop terminal is judging itself wireless link signals intensity between the user terminal lower than in pre-set After gravity treatment threshold value and when the duration is more than pre-set relaying reselection time window, the base station Xiang Suoshu, which is sent, to be relayed gravity treatment and asks It asks, wherein including the mark, the mark of current hop terminal, the business for needing to relay of the user terminal in relaying reselection request It is the speed of wireless link signals intensity, the user terminal between type, the user terminal and current hop terminal, current The speed of link terminal；

Transmission unit is also used to the judging result according to recognition unit, if judging, the user terminal needs gravity treatment link terminal, Then link terminal reselection message is sent to the user terminal.

19. base station according to claim 15, which is characterized in that

Recognition unit is judging the wireless link signals intensity between base station itself and current hop terminal lower than pre-set When relaying gravity treatment threshold value and duration and being more than pre-set relaying reselection time window, indicate transmission unit to the user Terminal sends link terminal reselection message.

20. base station described in any one of 5-19 according to claim 1, which is characterized in that

21. base station according to claim 15, which is characterized in that

22. base station according to claim 21, which is characterized in that

Selecting unit is with specific reference to the parameter for including in relaying received message, in the relay candidate terminal for sending relaying received message It is middle to select the optimal relay candidate terminal of service quality as new link terminal.

23. base station according to claim 15, which is characterized in that

24. base station according to claim 15, which is characterized in that

Transmission unit is also used to when receiving unit receives relaying and terminates request, and Xiang Suoshu user terminal sends relay services knot Beam message is established with the base station so as to the user terminal and is directly connected to, and established between disconnection and current hop terminal Device-to-device communication；Wherein the user terminal is judging that itself wireless link signals intensity between the base station is greater than Pre-set user relays threshold value and when the duration is more than pre-set terminations relaying time window, and the base station Xiang Suoshu is sent out Relaying is sent to terminate request.

25. a kind of system for gravity treatment link terminal, which is characterized in that including as described in any one of claim 15-24 Base station, and

User terminal, for disappearing after receiving the link terminal reselection message from the base station to the request of neighborhood broadcast relay Breath；

Relay candidate terminal receives to disappear for sending relaying after receiving the relay request message from the user terminal Breath；After receiving the relay connection from the base station and establishing message, device-to-device is established with the user terminal and is communicated.

26. system according to claim 25, which is characterized in that

Current hop terminal is also used to after receiving the relay services end message that the base station is sent, and is disconnected and the user The device-to-device of terminal communicates.

27. system according to claim 25, which is characterized in that

Relay candidate terminal is specifically after receiving the relay request message, and according to preset judgment criterion, judgement is certainly Whether body can forward data for the user terminal；If data can be forwarded for the user terminal by judging itself, to institute It states base station and sends relaying received message.

28. system according to claim 25, which is characterized in that

The user terminal is specifically judging itself wireless link signals intensity between current hop terminal lower than setting in advance When the relaying gravity treatment threshold value set and duration are more than pre-set relaying reselection time window, the base station Xiang Suoshu, which is sent, to be relayed Reselection request, wherein including the mark of the user terminal in relaying reselection request, the mark of current hop terminal, needing to relay Type of service, the wireless link signals intensity between the user terminal and current hop terminal, the speed of the user terminal The speed of degree, current hop terminal.

29. system according to claim 25, which is characterized in that

Current hop terminal is specifically judging itself wireless link signals intensity between the user terminal lower than setting in advance When the relaying gravity treatment threshold value set and duration are more than pre-set relaying reselection time window, the base station Xiang Suoshu, which is sent, to be relayed Reselection request, wherein including the mark of the user terminal in relaying reselection request, the mark of current hop terminal, needing to relay Type of service, the wireless link signals intensity between the user terminal and current hop terminal, the speed of the user terminal The speed of degree, current hop terminal.

30. system according to claim 25, which is characterized in that

It is predetermined to judge whether itself battery capacity is greater than specifically after receiving the relay request message for relay candidate terminal Electricity thresholding；If the battery capacity of itself is greater than scheduled electricity thresholding, judge that itself can turn for the user terminal Send out data；And/or after receiving the relay request message, judge whether the movement speed of itself is less than scheduled speed door Limit；If the movement speed of itself is less than scheduled speed threshold, judge that itself can forward data for the user terminal； And/or after receiving the relay request message, judge itself and the user terminal wireless link signals intensity whether Greater than scheduled strength threshold；If the wireless link signals intensity of itself and the user terminal is greater than scheduled strength threshold, Data can be forwarded for the user terminal by then judging itself.

31. system according to claim 25, which is characterized in that

The relay candidate terminal is also used to after sending relaying received message to the base station, is judged whether when scheduled Between receive the relay connection that the base station is sent in range and establish message；If not receiving in predetermined time range The relay connection that the base station is sent establishes message, then abandons being relayed for the user terminal.

32. system according to claim 25, which is characterized in that further include:

The user terminal is also used to preset judging that itself wireless link signals intensity between the base station is greater than User when relaying threshold value and duration and being more than pre-set terminations relaying time window, it is whole that the base station Xiang Suoshu sends relaying Only request；

The base station is also used to when receiving relaying termination request, and Xiang Suoshu user terminal sends relay services end message, It establishes and is directly connected to so as to the user terminal and the base station, and disconnect the equipment established between current hop terminal to setting Standby communication.