CN101902822A - Base station-assisted mobile terminal equipment autonomously accessing method and device - Google Patents
Base station-assisted mobile terminal equipment autonomously accessing method and device Download PDFInfo
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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 by another UE.
In cellular network, even two terminal equipments are adjacent very near, the also control that must communicate by the master controller of base station and so on comprises the distribution of the resource of the control of transmitting power and use.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, a kind of pattern (Device-to-Device communication of equipment room direct communication has been proposed among the LTE-Advanced, 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 communicate by letter with another UE under the control of base station, even can communicate with base station and other UE simultaneously.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 effective resource multiplex simultaneously in hybrid network.
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 interference of taking into account system inside, 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 a 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 sends and receiving course, with reference to shown in Figure 1, 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.
Another solution is the scheme of complete autonomous communication, similar to 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 send in the distributed network.Shortcoming is RTS, and control signalings such as CTS and ACK/NACK send at data channel, therefore can't send data when sending control signaling.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 in conjunction with or during not in conjunction with the CSMA/CA of RTS/CTS, can not effectively avoid coming from phone user's interference.
Wherein: DIFS is after last long frame is sent completely, and carries out the time that next long time frame sends midfeather before.
SIFS is the interval between the short frame.
SIFS is shorter than lasting time of DIFS, and 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 determines still not have other nodes after sending data, just sends.
As seen, 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.
As seen, 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, described 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 send signaling to transmitter;
After but transmitter receives signaling, from the ascending resource assignment information that the base station sends, obtain the resource that current transmission data can be used; The ascending resource that described base station sends is the ascending resource in the LTE system;
Carrying out data with the available resources of being obtained transmits.
Preferably, the available resources obtained using of described method also comprise before finishing 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, described method also comprises before the base station sends uplink assignment information:
Definition Common Control Channel, data control channel and data traffic channels.
Preferably, 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.
The present invention has also announced the device that the auxiliary mobile terminal equipment autonomously in a kind of base station inserts, and described 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 send signaling to transmitter;
The available resources acquisition module, but after being used for transmitter and receiving signaling, from the ascending resource assignment information that the base station sends, obtain the resource that current transmission data can be used; The ascending resource that described base station sends 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, described device also comprises:
Comparison module is used for transmitter the performance number and the pre-set threshold value of the received 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, described device also comprises:
The channel definition module is used to define Common Control Channel, data control channel and data traffic channels.
Preferably, described device also comprises:
Processing module is used at receiver when feedback can not send signaling to transmitter, and 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 by 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 send signaling to transmitter, after but transmitter receives signaling, from the ascending resource assignment information that the base station of LTE system sends, obtain the resource that current transmission data can be used, carrying out data with the available resources of being obtained 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 schematic diagram 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 schematic diagram 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 above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
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, described 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 send signaling to 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, described here shaking hands also is the ID that comprises transmitter that transmitter sends to receiver, the demand signalling of the ID of receiver, after receiver correctly receives demand signalling, feedback can send the process of signaling to transmitter, in the practical application, described transmitter and receiver all are the user terminals of D2D system, owing to there is the terminal that may have many data that needs are sent and receive simultaneously in the system, also to can be understood as be to seize the process that transmits data resource to handshake procedure like this, and the success of shaking hands also just can be understood as to rob to have accounted for and transmits the required resource of data.
S303, but after transmitter receives signaling, from the ascending resource assignment information that the base station sends, obtain the resource that current transmission data can be used; The ascending resource that described base station sends is the uplink transmission resource that LTE (Long Term Evolution, Long Term Evolution) system will use;
Base station (eNB) sends the ascending resource assignment information (being UL MAP information) of the user terminal (UE) in the cellular cell, terminal with D2D of cognitive function can translate this table, and then knows the information of the up resource that will take of 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 described method also comprise before finishing the transmission of data:
Transmitter compares the performance number and the pre-set threshold value of the available resources 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 using.Concrete detection compares by performance number and the pre-set threshold value of calculating the received 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, described method also comprises before the base station sends uplink assignment information:
Definition Common Control Channel, data control channel and data traffic channels.
In specific implementation, 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 Common Control Channel, data control channel and data traffic channels.
Preferably, if receiver not feedback can send signaling CTS to transmitter, then transmitter sends demand signalling after keeping out of the way the Preset Time section once more.
Defined three channels, at Common Control Channel Common Control Channel (CCCH), a plurality of D2D communication is to based on the RTS/CTS principle, the private resource the when mode by contention obtains the D2D transmission.RTS full name Request To Send, being the data transfer request by transmission terminal (TxUE) transmission of D2D centering, also is demand signalling, CTS full name Clear To Send, be by the receiving terminal (RxUE) of D2D centering send at replying that RTS sends, also get final product signaling.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 at 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 at 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 by the D2D resource management below.
ENB will broadcast channel (PBCH) or the down control channel (PDCCH) in whole sub-district broadcast the CCCH resource of D2D and DCCH resource, and will be used to shake hands by D2D user and set up D2D communicates to 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 be 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 send 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, be introduced by way of example, specifically can be with reference to Fig. 4, show the schematic diagram 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 by 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 schematic diagram 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 to 3 distance D 2D to 1 and D2D far away to 2, therefore will be not can to D2D to 1 and D2D 2 transfer of data constituted disturb, even they use identical running time-frequency resource to transmit.
When specific implementation 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 on every side send the RTS signaling simultaneously and carry 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 allow 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 should comprise TxUE and RxUE in the CTS signaling 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 not to TxUE feedback CTS signaling CTS signaling case of collision takes place perhaps, TxUE will send the RTS signaling after will keeping out of the way a period of time again.The time of keeping out of the way is the random value on a basic value T0 basis.If take place owing to collide or do not receive at the appointed time the situation of CTS signaling again, 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 have how rightly to D2D transmission in this zone, 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 by 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, sends on DCCH; 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 by 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, by using the resource contention principle of RTS/CTS, can effectively avoid at a distance of nearer D2D communication between interference.Simultaneously, also can make interference minimum to cellular system.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 and reception are very consuming time, 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 difference of different its hardware handles of UE, therefore the time of deal with data that needs and signaling is also different.If for the time relationship difference of these several control signalings of all D2D users, certainly will will cause the collision between data transmission and the signaling.The synchronous feature of SSARC will address this problem, and promptly the time interval between these several signalings is provided in advance by eNB, 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 by broadcast channel or CCCH in eNB.Another important feature 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 determine to send the precise time of data.In cellular system, such as in the LTE system, the ascending resource on the PDCCH distribute and transfer of data between time slot also be 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 to the phone user.And the phone user will send data simultaneously with the TxUE of D2D on identical frame, to reach the purpose of multiplexed resource and raising 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 terminal is robbed and accounted 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 be subjected to 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 send 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, the RxUE without collision receives this information, and is ready to send CTS (promptly can send the signaling of data); At TTI3, RxUE sends CTS to TxUE1; At TTI4, the TxUE without collision is received CTS, shows this a pair of D2D UE to having taken this resource, in ensuing a series of corresponding time slots, can not have 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 to 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 prepare the data that will send process (comprise to data modulate, encode, process such as encryption), in our experience and the disposal ability of 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 find in previous step, and at this moment also have the UE of cellular cell also will send upstream data with frequency to eNB simultaneously at TTI8, (being the PUSCH channel multiplexing same asset of DTCH and the cellular system of D2D), will not produce interference between these two kinds of systems, and then realize the multiplexing of resource efficiently; Simultaneously, TxUE also will send the control information of data to RxUE on DCCH, mainly be coding and the modulation intelligence that sends data, carry out demodulation and decoding to help RxUE after receiving data; 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 that sends and the D2D UE that is transmitting to be bumped to Data Control signaling and the ACK/NACK signaling that sends for the transmission of the D2D UE after preventing.Here suppose between TxUE and the RxUE not collision, if collision, then random back is initiated request again after a period of time, 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.As can be seen, the service efficiency of radio spectrum resources is greatly enhanced in this implementation method, and this situation is at single cellular system or single can not reach 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 also realizes in conjunction with tightr, link up and easilier 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, described 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 send signaling to transmitter;
Available resources acquisition module 603, but after being used for transmitter and receiving signaling, from the ascending resource assignment information that the base station sends, obtain the resource that current transmission data can be used; The ascending resource that described base station sends 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, described device also comprises:
Comparison module 605 is used for transmitter the performance number and the pre-set threshold value of the available resources obtained is compared;
Choose module 606, be used for choosing the little available resources of interference according to comparative result.
Preferably, described device also comprises:
Channel definition module 607 is used to define Common Control Channel, data control channel and data traffic channels.
Preferably, described device also comprises:
Processing module 608 is used at receiver when feedback can not send signaling to transmitter, and 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 substantially to 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 be described in detail, used specific case herein 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 all can change in specific embodiments and applications, 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 described 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 send signaling to transmitter;
After but transmitter receives signaling, from the ascending resource assignment information that the base station sends, obtain the resource that current transmission data can be used; The ascending resource that described base station sends is the ascending resource in the LTE system;
Carrying out data with the available resources of being obtained transmits.
2. method according to claim 1 is characterized in that, the available resources that described method is obtained using also comprise before finishing 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.
3. method according to claim 1 is characterized in that, described method also comprises before the base station sends uplink assignment information:
Definition Common Control Channel, data control channel and data traffic channels.
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 described 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 send signaling to transmitter;
The available resources acquisition module, but after being used for transmitter and receiving signaling, from the ascending resource assignment information that the base station sends, obtain the resource that current transmission data can be used; The ascending resource that described base station sends 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, described device also comprises:
Comparison module is used for transmitter the performance number and the pre-set threshold value of the received 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, described device also comprises:
The channel definition module is used to define Common Control Channel, data control channel and data traffic channels.
8. device according to claim 5 is characterized in that, described device also comprises:
Processing module is used at receiver when feedback can not send signaling to transmitter, and transmitter sends demand signalling after keeping out of the way the Preset Time section once more.
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| CN 201010237273 CN101902822B (en) | 2010-07-22 | 2010-07-22 | Base station-assisted mobile terminal equipment autonomously accessing method and device |
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