CN101902822B - Base station-assisted mobile terminal equipment autonomously accessing method and device - Google Patents
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Abstract
The invention provides a base station-assisted mobile terminal equipment autonomously accessing method and a base station-assisted mobile terminal equipment autonomously accessing device. The method comprises the following steps of: transmitting a request signaling to a receiver by using a transmitter, wherein the request signaling comprises the ID of the transmitter and the ID of the receiver; after the receiver receives the request signaling, feeding back a transmittable signaling to the receiver; after the receiver receives the transmittable signaling, acquiring available resource of current transmitting data from uplink resource distribution information transmitted from a base station of an LTE system; and performing data transmission by using the acquired available resource. Resource is seized by means of handshake between terminals and is transmitted by adopting the same frequency and the same time slot as those of the LTE system, so that rapid communication between user terminals and reasonable utilization of the sources are ensured.
Description
Technical field
The present invention relates to the mobile communication technology field, particularly relate to the method and apparatus that the auxiliary mobile terminal equipment autonomously in a kind of base station inserts.
Background technology
In the IMT-Advanced network, have between the terminal equipment of cognitive function and when satisfying certain condition, can directly communicate.
At present, mainly contain two kinds of network configurations: the Ad-hoc network of the cellular network of centralized control and distributed control.
Cellular network: the communication between the terminal equipment (UE) must be passed through base station (BS, perhaps NB, control eNB).
Ad-hoc network: can directly communicate between the UE, perhaps carry out relaying through another UE.
In cellular network, even two terminal equipments are adjacent very near, the control that also must communicate through the master controller of base station and so on comprises the distribution of resource of control and the use of transmitting power.The benefit that the system of centralized control like this brings is to be convenient to resource management and Interference Control, but shortcoming is also clearly---the service efficiency of resource is not high, for example, even two UE close proximity also will use double resource to communicate.Therefore, in order to improve the frequency spectrum service efficiency, obtain higher throughput of system; Proposed among the LTE-Advanced a kind of equipment room direct communication pattern (Device-to-Device communication, D2D), like this; Following communication network will no longer be the network of single-mode; But centralized network and distributed network and the hybrid network deposited, in the following hybrid network and D2D communication pattern, a UE can send data directly for another UE; Also can under the control of base station, communicate by letter, even can communicate with other UE with the base station simultaneously with another UE.Compare with the network of single-mode, this hybrid network will bring the gain of bigger systematic function undoubtedly.
In cellular network, base stations control all details of communicating by letter between the UE, but in hybrid network, the data communication of how controlling between the UE is the problem that needs solve.About this problem, have several aspects to need to consider:
The first, how to realize the D2D transmission at authorized frequency bands, this also means how to realize in hybrid network that efficient resource is multiplexing simultaneously.
The second, how to realize synchronously.In the network of centralized control, the transmission of UE is controlled by eNB fully, UE can realize and eNB between synchronously; And in the such distributed network of ad-hoc, the access between the equipment is to rely on the competition based on CSMA/CA mechanism to realize in such network, not having synchronous between the equipment.
The 3rd, for the system of multiplexing same asset, how to realize interference coordination.Here, except wanting the inner interference of taking into account system, also want the interference between the taking into account system.Simultaneously, signaling consumption must be within the acceptable scope.
The 4th, when exist in the network more D2D transmission to the time, how to design access module at random, make them both can realize inserting at random effectively transmission with D2D, can not disturb main system (LTE system or LTE-A system are main cellular system) again.
The 5th, how to design and realize that effective handshake procedure realizes D2D transmission.Otherwise the user of D2D does not know when to begin D2D communication, and adopts which kind of resource to carry out D2D communication.
In hybrid network,, improve systematic function to avoid interference because therefore D2D transmission and the multiplexing identical frequency resource of phone user's transmission need RRM intelligent more.But require solution can utilize all acquired informations, comprise the signaling in the cellular network, realize the RRM (distribution of frequency resource, power control and interference suppress or the like) of D2D transmission.
At present, a simple method is exactly that eNB controls the D2D transfer of data fully, just as the uplink in the control cellular system.Such as, if terminal UE will send data to another UE (dividing these two UE of another name is TxUE and RxUE), under the scene that eNB controls fully, signaling is sent and receiving course, with reference to shown in Figure 1, and the D2D command transmitting schematic flow sheet of controlling fully for eNB.This method centralized control unit eNB can easily control all D2D data transmission procedures; Need not to worry the confusion to communication generation simultaneously owing to a plurality of D2D, eNB can realize D2D user and phone user's resource multiplex under the situation that guarantees certain interference level.But because eNB has controlled this process fully, all signaling procedures relevant with D2D have also consumed the resource of cellular system, therefore can influence the performance of cellular system.Simultaneously, if D2D communication is to quantity when big in the hybrid network, signaling consumption also can be very big.
A solution is the scheme of complete autonomous communication in addition; Similar with the implementation method in the Ad-hoc network; As shown in Figure 2, for having the CSMA/CA principle of RTS and CTS, CSMA/CA that promptly in IEEE802.11, adopts or the CSMA/CA that does not have RTS/CTS with RTS/CTS.The advantage of this method is the problem that has solved contention for resources when data are sent in the distributed network.Shortcoming is RTS, and control signalings such as CTS and ACK/NACK are sent at data channel, therefore when sending control signaling, can't send data.In CSMA/CA, the carrier wave perception is an important way of avoiding taking place data collision, yet, in the process of DIFS and SIFS, can not send data.More than 2 will reduce the frequency spectrum service efficiency, particularly when the packet that need to send be during in a large number than short packages, this method is poor efficiency more just.In addition, when the multiplexing same asset of heterogeneous network, use when combining perhaps not combine the CSMA/CA of RTS/CTS, can not effectively avoid coming from phone user's interference.
Wherein: DIFS after last long frame transmission is accomplished, carries out the time that next long time frame sends midfeather before.
SIFS is the interval between the short frame.
The time weak point that SIFS is more lasting than DIFS, using two kinds of interFrameGaps (IFS) is kind and priority in order to distinguish the Frame that will transmit.
The effect of using DIFS and SIFS is because in wlan network, does not have master controller to coordinate between the node, and therefore the chance of collision is very high.After using DIFS and SIFS, just can reduce the chance of collision.Node was listened earlier channel before transmit frame, do not find that other nodes send data after, the interval of intercepting a DIFS or SIFS again confirms still not have other nodes after sending data, just sends.
It is thus clear that the disadvantage of this principle is:
During IFS, can't send data, reduced system effectiveness;
For will send more short frame the time, use a large amount of IFS, reduced the efficient of system more.
It is thus clear that, present existing solution or have the too big problem of signaling load, or have the low problem of spectrum efficiency, all effective solution can not be proposed.
Therefore, need the urgent technical problem that solves of those skilled in the art to be exactly at present: how can propose a kind of new implementation method with innovating,, to improve the efficient of communicating by letter between the portable terminal to solve existing problem in the prior art.
Summary of the invention
Technical problem to be solved by this invention provides the method and apparatus that the auxiliary mobile terminal equipment autonomously in a kind of base station inserts, in order to guarantee the communication rapidly and efficiently between user terminal.
In order to address the above problem, the invention discloses the method that the auxiliary mobile terminal equipment autonomously in a kind of base station inserts, said method comprises:
Transmitter sends demand signalling to receiver; The described request signaling comprises the ID of transmitter and the ID of receiver;
After receiver correctly received demand signalling, feedback can be sent signaling and given transmitter;
After but transmitter receives signaling, from the ascending resource assignment information that send the base station, obtain the resource that current transmission data can be used; The ascending resource that send said base station is the ascending resource in the LTE system;
Using the available resources of being obtained to carry out data transmits.
Preferably, the available resources obtained using of said method also comprise before accomplishing the transmission of data:
Transmitter compares received signal power value and the pre-set threshold value on the available resources of being obtained;
Choose the little available resources of interference according to comparative result.
Preferably, said method also comprises before uplink assignment information is sent in the base station:
Define three and new have the identical frequency resource and the physical channel of structure of time slot, be respectively CCCH, data control channel and data traffic channels with the LTE system.
Preferably, if receiver not feedback can send signaling and give transmitter, then transmitter sends demand signalling after keeping out of the way the Preset Time section once more.
The present invention has also announced the device that the auxiliary mobile terminal equipment autonomously in a kind of base station inserts, and said device comprises:
The demand signalling sending module is used for transmitter and sends demand signalling to receiver; The described request signaling comprises the ID of transmitter and the ID of receiver;
Can send signaling feedback module, after being used for receiver and correctly receiving demand signalling, feedback can be sent signaling and given transmitter;
The available resources acquisition module, but after being used for transmitter and receiving signaling, from the ascending resource assignment information that send the base station, obtain the resource that current transmission data can be used; The ascending resource that send said base station is the ascending resource in the LTE system;
Data transmitting module, the available resources that are used to be obtained carry out data and transmit.
Preferably, said device also comprises:
Comparison module is used for transmitter the performance number and the pre-set threshold value of the reception signal on the available resources of being obtained is compared;
Choose module, be used for choosing the little available resources of interference according to comparative result.
Preferably, said device also comprises:
The channel definition module is used to define three and new has the identical frequency resource and the physical channel of structure of time slot with the LTE system, is respectively CCCH, data control channel and data traffic channels.
Preferably, said device also comprises:
Processing module, be used for receiver feedback can not send signaling when giving transmitter, transmitter sends demand signalling after keeping out of the way the Preset Time section once more.
Compared with prior art, the present invention has the following advantages:
The present invention sends demand signalling through transmitter to receiver; The described request signaling comprises the ID of transmitter and the ID of receiver; After receiver correctly receives demand signalling; Feedback can be sent signaling and given transmitter, but after transmitter receives signaling, from the ascending resource assignment information that send the base station of LTE system, obtains the resource that current transmission data can be used; Using the available resources of being obtained to carry out data transmits; By the terminal room preempting resources of shaking hands, and employing frequency and the time slot identical with the LET system transmit, and guaranteed high-speed traffic and reasonable resources utilization between user terminal.
Description of drawings
Fig. 1 is the D2D command transmitting schematic flow sheet that base station in the prior art of the present invention (eNB) is controlled fully;
Fig. 2 is the CSMA/CA principle schematic that has RTS and CTS in the prior art of the present invention;
Fig. 3 is the method flow diagram that the auxiliary mobile terminal equipment autonomously in the embodiment of the invention one described a kind of base station inserts;
Fig. 4 is the sketch map of the embodiment of the invention one described D2D system and LTE system uplink channelized frequencies resource;
Fig. 5 be the embodiment of the invention one described a plurality of D2D transmission-reception UE between the sketch map of resource contention;
Fig. 6 is the structure drawing of device that the auxiliary mobile terminal equipment autonomously in the embodiment of the invention two described a kind of base stations inserts.
Embodiment
For make above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, below in conjunction with accompanying drawing and embodiment the present invention done further detailed explanation.
Embodiment one:
With reference to Fig. 3, show the method flow diagram that the auxiliary mobile terminal equipment autonomously in a kind of base station of the present invention inserts, said method specifically comprises:
S301, transmitter sends demand signalling to receiver; The described request signaling comprises the ID of transmitter and the ID of receiver;
After S302, receiver correctly received demand signalling, feedback can be sent signaling and given transmitter;
Wherein, send demand signalling and be called for short RTS, can send signaling and be called for short CTS.
Pattern (Device-to-Device communication in a kind of equipment room direct communication; D2D) in the system; Transmitter and receiver carry out handshake procedure according to the principle of the time slot A loha (SSARC) of RTS/CTS, and the demand signalling of the ID of described here the shaking hands ID that comprises transmitter that also to be transmitter send to receiver, receiver is after receiver correctly receives demand signalling; Feedback can be sent the process that signaling is given transmitter; In the practical application, described transmitter and receiver all are the user terminals of D2D system, owing to there is the terminal possibly there are many data that needs are sent and receive simultaneously in the system; Handshake procedure is appreciated that also the success of shaking hands also just is appreciated that to robbing to have accounted for and transmits the required resource of data in order to be to seize the process that transmits data resource like this.
S303, but after transmitter receives signaling, from the ascending resource assignment information that send the base station, obtain the resource that current transmission data can be used; The ascending resource that send said base station is the uplink transmission resource that LTE (Long Term Evolution, Long Term Evolution) system will use;
The ascending resource assignment information (being UL MAP information) of the user terminal (UE) in the cellular cell is sent in base station (eNB), and the terminal with D2D of cognitive function can translate this table, and then knows the information of up the resource that will take at the terminal of cellular cell.
S304 uses the available resources of being obtained to carry out data and transmits.
Preferably, the available resources obtained using of said method also comprise before accomplishing the transmission of data:
Transmitter compares the performance number and the pre-set threshold value of the available resources of being obtained;
Choose the little available resources of interference according to comparative result.
The transmission UE of D2D UE centering will detect these resources, finds the interference to D2D UE is that they can be multiplexing for a short time on which resource, and the interference to the D2D transmission is big on which resource, is that D2D UE will avoid the use of.Concrete detection compares through performance number and the pre-set threshold value of calculating the reception signal on the available resources of being obtained; Choose the little available resources of interference according to comparative result, specifically, performance number is just little less than the interference of pre-set threshold value.In the practical application, it is next fixed according to its data volume that will send size specifically will finding how many available resources.
Preferably, said method also comprises before uplink assignment information is sent in the base station:
Definition CCCH, data control channel and data traffic channels.
In concrete the realization, need be three new physical channels of D2D system definition, these three new physical channels have identical frequency resource and structure of time slot with the LTE system.Defined channel is specially CCCH, data control channel and data traffic channels.
Preferably, if receiver not feedback can send signaling CTS and give transmitter, then transmitter sends demand signalling after keeping out of the way the Preset Time section once more.
Defined three channels, at CCCH Common Control Channel (CCCH), a plurality of D2D communication is to based on the RTS/CTS principle, the private resource the when mode through contention obtains the D2D transmission.RTS full name Request To Send; Being the data transfer request of being sent by the transmission terminal (TxUE) of D2D centering, also is demand signalling, CTS full name Clear To Send; Be to reply to what RTS sent, also get final product signaling by what the receiving terminal (RxUE) of D2D centering sent.RTS shares identical CCCH frequency resource with CTS on time domain, that is: on identical CCCH, RTS sends at first time slot, and CTS sends at the 3rd time slot.The right CCCH channel of a plurality of D2D transmission of hypothesis can adopt time division multiple access to insert (TDMA among the present invention; Full name: multiplexer mode Time Division Multiple Access); The benefit that adopts TDMA be can avoid two pairs of D2D transmission to successfully having inserted simultaneously channel but but selected identical DTCH, thereby the collision when causing transfer of data.Wherein, RTS is based on the transmission of contention, and CTS is not based on contention, but to a certain RTS in the time of appointment and the well-determined response on the frequency resource.
Data control channel Data Control Channel (DCCH) is used to carry the control messages relevant with transfer of data, comprises that acknowledging receipt of signal (ACK)/affirmation does not receive signal (NACK).Described to acknowledge receipt of and confirm not receive all be to data traffic channels Data Traffic channels (DTCH), is used to bearing data service.Because D2D transfer of data and phone user are resource-sharings; DTCH resource corresponding to RTS/CTS does not have contention with other local D2D users; But may have contention with the phone user, but this contention for resources can solve through the D2D resource management below.
ENB will broadcast the CCCH resource of D2D and broadcast channel (PBCH) or the down control channel (PDCCH) of DCCH resource in whole sub-district, will is used to shake hands and set up D2D communication by D2D user connect and the authentication data transmission process.All D2D users can both obtain the resource information of CCCH at an easy rate, because therefore CCCH channel occupancy specific resources has enough reliabilities, and can not disturbed.Because D2D user also can communicate with eNB, so the D2D signaling is followed identical frame structure and time relationship with communication process and cellular system.The data of D2D UE are sent on the DTCH channel, and these data are that UE shared resource with cellular cell sends.
What need further specify is that the LTE system is as the example of cellular system.In the LTE system, three kinds of uplink physical channel: PUCCH, PUSCH and PRACH are arranged.PUCCH will be dispensed on the both sides of system bandwidth, and PUSCH and PRACH are with multiplexing remaining frequency resource, and wherein PRACH uses 6 Physical Resource Block (PRB) resource that the center frequency range is reserved.In order effectively to solve interference problem, will require some frequency resources to need to divide separately.Here in order to specify; Introduce by way of example; Specifically can be with reference to Fig. 4; Show the sketch map of D2D system and LTE system uplink channelized frequencies resource, the PUCCHs/PRACHs of LTE will be retained as common application, and the frequency resource of two control channel CCCH of D2D system and DCCH need be reserved separately from the PUSCHs of LTE.And remaining LTE PUSCH resource will with D2D data communication (DTCH channel) shared resource, this process realizes RRM (RRM) algorithm through D2D UE.This resource distribution mode can be guaranteed not disturb between the control signaling of D2D system and cellular system.In principle, the PUCCHs resource of the LTE system multiplexed resource of also can communicating by letter with D2D.
PDCCH described in the present embodiment is a Physical Downlink Control Channel, full name Physical Downlink Control Channel; PUCCH is a Physical Uplink Control Channel, full name Physical Uplink Control Chennel; PUSCH is a Physical Uplink Shared Channel, full name Physical Uplink Share Channel; PRACH is a Physical Random Access Channel, full name Physical Random Access Channel.
Here to a plurality of D2D transmission-reception UE between resource contention replenish introduction, have the time slot A loha (SSARC) of RTS/CTS, with reference to Fig. 5, show a plurality of D2D transmission-reception UE between the sketch map of resource contention; First couple of D2D user also is D2D to 1 and D2D will interfere with each other when being separated by nearer and use same asset 2.Therefore, they will carry out handshake procedure on the CCCH channel, realize the contention of resource.D2D is far away to 2 with D2D to 1 to 3 distance B 2D, therefore will can not disturb 2 transfer of data formation with D2D 1 D2D, even they use identical running time-frequency resource to transmit.
When concrete realization is shaken hands with the data transmission; Performing step is specially: TxUE sends the RTS order and shows have data to send on CCCH; This signaling also is based on contention mechanism simultaneously, and a plurality of D2D terminals that will send data are on every side sent the RTS signaling simultaneously and carried out the competition of data channel and seize.Should comprise the ID of TxUE and RxUE in this signaling, can also comprise the transmitted power of RTS sometimes, so that let RxUE can detect this quality of channel; If RxUE can receive the RTS signal under collisionless situation, then still on this CCCH channel, feed back to cts signal of TxUE, otherwise will not feed back any message to TxUE.The ID that in the CTS signaling, should comprise TxUE and RxUE can also comprise CQI (CQI) information that RxUE calculates, so that TxUE carries out the RRM of D2D; Correctly receive the CTS signaling and mean that TxUE has obtained to send to RxUE at corresponding TTI the right of data from RxUE.Otherwise if RxUE to TxUE feedback CTS signaling CTS signaling case of collision takes place perhaps, TxUE will keep out of the way the RTS signaling of redispatching after a period of time.The time of keeping out of the way is the random value on a basic value T0 basis.If take place again because collision does not perhaps receive the situation of CTS signaling at the appointed time, T0 will be increased.On the contrary, if successfully received the CTS signaling, T0 will be reduced so, as the foundation of back off algorithm next time.Like this, even in this zone, have how rightly to D2D transmission, their competition also can Be Controlled; After TxUE successfully receives CTS from RxUE, TxUE will send data to RxUE.The channel that sends data is not on CCCH, but through sending on the DTCH channel with the cellular system multiplexed resource.Sending relevant control signaling (comprising data modulation coding mode, resource multiplex situation etc.) with data will be distributed by the RRM of D2D system, on DCCH, sends; RxUE will send the state that ACK/NACK feeds back the data of receiving to TxUE, and this is the foundation (HARQ of MAC layer or the ARQ of rlc layer) whether the TxUE decision carries out data re-transmission.
Have through the step recited above advantage that has of shaking hands: the resource of eNB broadcasting D2D CCCHs, based on this, all the D2D users in the sub-district can both share handshake procedure and the contention that this CCCHs channel carries out the D2D transmission; D2D CCCHs follows frame structure identical with cellular system and time slot relation; Therefore just no longer need DIFS and SIFS among the CSMA/CA to intercept; So just improved the resource utilization of system; Through using the resource contention principle of RTS/CTS, can effectively avoid at a distance of nearer D2D communication between interference.Simultaneously, also can make to the interference of cellular system minimum.Simultaneously, D2D user's transmitted power has obtained saving.In addition, if the distance between phone user and the D2D user is enough big, the data transmission resources between the two can be multiplexing, can significantly improve the frequency efficiency and the throughput of system like this.
Here time slot is specifically introduced, TxUE and RxUE need the time to handle the signaling on the D2D CCCHs and feed back in the real work.Especially, because transfer of data is very consuming time with receiving, the time interval between RTS/CTS, Data Transmission Controlling signaling (Data C trl) and the ACK/NACK is generally all bigger.Yet well-known, the ability of different its hardware handles of UE is different, and the deal with data that therefore needs is also different with the time of signaling.If the time relationship as far as these several kinds control of all D2D users signaling is different, certainly will will cause the collision between data transmission and the signaling.The synchronous characteristic of SSARC will address this problem, and promptly the time interval between these several kinds of signalings is provided by eNB in advance, and all D2D users must strictly observe.Unusual collision to this time relationship of all D2D users broadcastings, because these signalings are synchronous, therefore will can not take place through broadcast channel or CCCH in eNB.Another important characteristic of SSARC is that D2D UE can utilize the signaling of cellular system and the RRM that message realizes the D2D system.In case send RTS, TxUE just can confirm to send the precise time of data.In cellular system; Such as in the LTE system; Time slot between distribution of the ascending resource on the PDCCH and transfer of data also is constant (generally be 4 TTIs, a TTI represents a time slot), so D2D UE just can know easily when eNB sends the UL resource allocation message and give the phone user.And the phone user will send data simultaneously with the TxUE of D2D on identical frame, to reach multiplexed resource and the purpose that improves the frequency spectrum service efficiency.Therefore, if possible, D2D UE will translate phone user's UL resource allocation information and other relevant signalings as far as possible from cellular system, realize D2D RRM to help oneself.
In the real work, RTS/CTS is in the CCCH channel, and DataCtrl and ACK/NACK transmit on DCCH, and the data of D2D are in the DTCH channel, and the PUSCH multiplexed resource of DTCH and cellular system.
Need to prove that after eNB had sent out UL MAP, UE will carry out data at the 4th time slot and send; And according to design of the present invention, D2D UE also will carry out data at the 4th time slot and send, and then can realize the noiseless transmission between two systems fully.Whole time slot relation all is the time slot relation corresponding to the LTE system, rather than the sort of fully unordered mixed and disorderly time slot of picture in 802.11 networks, like this, just no longer needs any interFrameGap to carry out synchronously and avoids collision in following process.Because whole hybrid network is followed the time slot relation of LTE system; In case a pair of D2D robs at the terminal and accounts for resource, in ensuing a series of corresponding time slots, have only this a pair of D2D UE using this resource; Until the end of transmission, and can not receive the right interference of other D2D transmission.
D2D UE centering, TxUE is for sending UE, and RxUE is for receiving UE; Then according to the time slot of LTE; The process that whole access at random and data are sent is: at TTI1, TxUE certain child resource on CCCH (is assumed to be f1, t1) goes up to RxUE and send RTS (being the request of data signaling); At TTI2, receive this information to the RxUE collisionless, and be ready to send CTS (promptly can send the signaling of data); At TTI3, RxUE sends CTS to TxUE1; At TTI4, receive CTS to the TxUE collisionless, show this a pair of D2D UE to having taken this resource, in ensuing a series of corresponding time slots, can not there be other D2D terminal that meeting is caused interference to this a pair of D2D; In TTI5; TxUE deciphers the UL MAP that comes from eNB that receives, and learns and can send at the enterprising line data of which Resource Block, simultaneously; The UE of cellular cell also will use identical Resource Block to carry out data and send, and at this moment will not produce interference between these two systems.Notice that eNB will send UL MAP information at each time slot, so the situation that TxUE can not find UL MAP can not occur; At TTI5 in these three time slots of TTI7; Be that TxUE translates UL MAP, and find available resources, and the process of the data of preparing to send (comprise to data modulate, encode, process such as encryption); In our experience and the disposal ability at existing terminal, 3 TTI have enough used; At TTI8; TxUE sends data to RxUE on DTCH; The resource of using is the available resources that in a last step, found, and at this moment also has the UE of cellular cell also will send upstream data, (being the PUSCH channel multiplexing same asset of DTCH and the cellular system of D2D) to eNB frequently together simultaneously at TTI8; Will not produce interference between these two kinds of systems, and then realize the multiplexing of resource efficiently; Simultaneously, TxUE also will be on DCCH sends the control information of data to RxUE, mainly is coding and the modulation intelligence that sends data, after receiving data, carries out demodulation and decoding to help RxUE; At TTI12, after RxUE received data, feeding back ACK/nack message on DCCH showed that success is received or does not successfully receive the message that TxUE sends.
Wherein, Why mark DCCH separately and transmit Data Control signaling and ACK/NACK signaling; Rather than still above CCCH, transmit, be RTS/CTS signaling of sending and the D2D UE that is transmitting to be bumped to the Data Control signaling and the ACK/NACK signaling of sending for the transmission of the D2D UE after preventing.Here suppose between TxUE and the RxUE not collision, if collision, random back initiation request again after a period of time then, all the other steps are identical with foregoing description.Here be to be that example describes with a pair of TxUE and RxUE.Actual conditions are likely that having a pair of TxUE and RxUE successfully to rob again to account for channel can carry out D2D at TTI2 sends, and their time slot relation is with regard to integral body 1 TTI of postponing so, and data send with reception between corresponding slot time constant.Can find out that the service efficiency of radio spectrum resources is greatly enhanced in this implementation method, and this situation can not reach at single cellular system or single in based on the CSMA/CA system that has or do not have RTS/CTS.Need to prove that the method described in the present embodiment realizes that also combination is tightr, linking up more is prone to understand.
Embodiment two:
With reference to Fig. 6, show the device that the auxiliary mobile terminal equipment autonomously in a kind of base station of the present invention inserts, said device comprises:
Demand signalling sending module 601 is used for transmitter and sends demand signalling to receiver; The described request signaling comprises the ID of transmitter and the ID of receiver;
Can send signaling feedback module 602, after being used for receiver and correctly receiving demand signalling, feedback can be sent signaling and given transmitter;
Available resources acquisition module 603, but after being used for transmitter and receiving signaling, from the ascending resource assignment information that send the base station, obtain the resource that current transmission data can be used; The ascending resource that send said base station is the ascending resource in the LTE system;
Data transmitting module 604, the available resources that are used to be obtained carry out data and transmit.
Preferably, said device also comprises:
Comparison module 605 is used for transmitter the performance number and the pre-set threshold value of the available resources of being obtained is compared;
Choose module 606, be used for choosing the little available resources of interference according to comparative result.
Preferably, said device also comprises:
Channel definition module 607 is used to define CCCH, data control channel and data traffic channels.
Preferably, said device also comprises:
Processing module 608, be used for receiver feedback can not send signaling when giving transmitter, transmitter sends demand signalling after keeping out of the way the Preset Time section once more.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.For device embodiment, because it is similar basically with method embodiment, so description is fairly simple, relevant part gets final product referring to the part explanation of method embodiment.
More than method and apparatus that the auxiliary mobile terminal equipment autonomously in a kind of base station provided by the present invention is inserted carried out detailed introduction; Used concrete example among this paper principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (8)
1. the method that inserts of the auxiliary mobile terminal equipment autonomously in a base station is characterized in that said method comprises:
Transmitter sends demand signalling to receiver; The described request signaling comprises the ID of transmitter and the ID of receiver;
After receiver correctly received demand signalling, feedback can be sent signaling and given transmitter;
After but transmitter receives signaling, from the ascending resource assignment information that send the base station, obtain the resource that current transmission data can be used; The ascending resource that send said base station is the ascending resource in the LTE system;
Using the available resources of being obtained to carry out data transmits.
2. method according to claim 1 is characterized in that, also comprises before the transmission of the available resources completion data that said method is obtained using:
Transmitter compares received signal power value and the pre-set threshold value on the available resources of being obtained;
Choose the little available resources of interference according to comparative result.
3. method according to claim 1 is characterized in that, said method also comprises before uplink assignment information is sent in the base station:
Define three and new have the identical frequency resource and the physical channel of structure of time slot, be respectively CCCH, data control channel and data traffic channels with the LTE system.
4. method according to claim 1 is characterized in that:
If receiver not feedback can send signaling to transmitter, then transmitter sends demand signalling after keeping out of the way the Preset Time section once more.
5. the device that inserts of the auxiliary mobile terminal equipment autonomously in a base station is characterised in that wherein said device comprises:
The demand signalling sending module is used for transmitter and sends demand signalling to receiver; The described request signaling comprises the ID of transmitter and the ID of receiver;
Can send signaling feedback module, after being used for receiver and correctly receiving demand signalling, feedback can be sent signaling and given transmitter;
The available resources acquisition module, but after being used for transmitter and receiving signaling, from the ascending resource assignment information that send the base station, obtain the resource that current transmission data can be used; The ascending resource that send said base station is the ascending resource in the LTE system;
Data transmitting module, the available resources that are used to be obtained carry out data and transmit.
6. device according to claim 5 is characterized in that, said device also comprises:
Comparison module is used for transmitter the performance number and the pre-set threshold value of the reception signal on the available resources of being obtained is compared;
Choose module, be used for choosing the little available resources of interference according to comparative result.
7. device according to claim 5 is characterized in that, said device also comprises:
The channel definition module is used to define three and new has the identical frequency resource and the physical channel of structure of time slot with the LTE system, is respectively CCCH, data control channel and data traffic channels.
8. device according to claim 5 is characterized in that, said device also comprises:
Processing module, be used for receiver feedback can not send signaling when giving transmitter, transmitter sends demand signalling after keeping out of the way the Preset Time section once more.
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