CN101132617B - Method and system for implementing point-to-point peer communication - Google Patents
Method and system for implementing point-to-point peer communication Download PDFInfo
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- CN101132617B CN101132617B CN2006101119352A CN200610111935A CN101132617B CN 101132617 B CN101132617 B CN 101132617B CN 2006101119352 A CN2006101119352 A CN 2006101119352A CN 200610111935 A CN200610111935 A CN 200610111935A CN 101132617 B CN101132617 B CN 101132617B
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Abstract
This invention discloses a method and a system for realizing point-to-point communication including: selecting a communication channel capable of carrying out P2P communication by a terminal to communicate with the opposite end directly, so it's not necessary for the system to distribute radio resource to terminals for P2P so as to re-utilize the radio resource.
Description
Technical field
The present invention relates to the communications field, relate in particular to the technology of setting up of straight-through link.
Background technology
Providing the big power system capacity of trying one's best with limited frequency range is one of key technology of present mobile radio system.For example, in wireless cellular system, provide the reutilization technology of channel (frequency) to come to provide the big power system capacity of trying one's best for the user.This technology adopts a plurality of transceivers to form the access network of mobile communication system, and with respect to whole mobile system service area, the signal of each transceiver only covers one more among a small circle, the overlapping to some extent and use different channels of the coverage of adjacent transceiver.When two distance between transmitter and receiver were enough far away, even both use same channel, mutual interference also was reduced in the acceptable scope because of the decay of signal, has so just realized the utilization again of channel (frequency).
Transceiver is called as the base station (Base Transceiver Station, BTS), the scope that the base station covered is called sub-district (Cell) in mobile communication system.If obviously increase the base station, dwindle cell range, can make overall system capacity obtain increasing.But if the base station is too much, system will be too complicated, therefore can not come the capacity of dilatation whole system with the quantity that increases the base station merely.
At present, people generally adopt the microcellulor technology to increase the capacity of system, the core of this technology is to adopt microcellulor sub-district (microcell) to strengthen wireless area coverage, and the microcell base station that will hang down transmitting power is placed on " focus " of described macrocell.The covering radius of general described microcellulor sub-district is 30m～300m, base station antenna height is lower than the height on roof, the propagation of signal is mainly carried out along the sight line in street like this, and in the roof position, the leakage minimum of signal, therefore microcell is used to strengthen wireless area coverage at first, eliminates " blind spot " among the macrocell.In addition, because the microcell base station of low transmitting power allows with less frequency reuse distance, RF (radio frequency, radio frequency) disturbs very low like this, and the channel quantity of each unit area is more, and traffic density will obtain tremendous growth like this.If therefore the base station is placed on " focus " of macrocell, can satisfies the requirement of the quality and capacity two aspects of this tiny area.
In traditional cell mobile communication systems, no matter two terminal uses that communicate are the distance of distance, all will adopt communication pattern as shown in Figure 1, promptly must communicate by the relaying of base station between two terminal uses, this communication pattern is also referred to as up-base station-downlink mode.When adopting this communication pattern to communicate, owing to all communication informations between two communication terminals all need the transfer of base station just can finish, therefore, it can take the resource of base station.For this reason, proposed to pass through the thought that P2P (Peer-to-Peer, point-to-point peer-to-peer communications) communication pattern communicates afterwards, it realizes principle as shown in Figure 2, when two terminal distances are very near, can directly between the two, not communicate by base station relaying/forwarding.Adopt the frequency resource of utilizing that the more traditional communication pattern of P2P pattern can be maximum, but need UTRAN (UniversalMobile Telecommunications System Terrestrial Radio Access Network, the Universal Mobile Telecommunications System land radio access web) keeps control, so that Virtual network operator can be charged to the terminal of carrying out P2P easily to the terminal of carrying out P2P.
The prior art relevant with the present invention provides the method and apparatus of setting up the point-to-point peer-to-peer communications in a kind of cordless communication network, the core technology of this method is: according to the log-on message and the positional information of call subscriber terminal and called user terminal, wireless communication system determines whether two user terminals are positioned at same sub-district, and whether the distance of calculating between these two user terminals satisfies the distance that P2P requires; When the distance of two user terminals between same sub-district and this two user terminals satisfies requiring of P2P, whether two user terminals that show that have according to this wireless communication system all possess the information of P2P ability, determine whether two user terminals all possess the communication capacity of P2P; And when two user terminals all possess the communication capacity of P2P, distribute DCL for these two user terminals, so that it carries out the communication of P2P.
By the technical scheme of prior art as can be seen, prior art exists following defective:
It is the terminal distribution Radio Resource that carries out P2P that prior art needs system, and as time slot, spreading code etc., this can take UTRAN resource (with respect to certain base station).
Summary of the invention
The invention provides a kind of method and system at the point-to-point peer-to-peer communications of realization, must need system in order to existence in the solution prior art is the terminal distribution Radio Resource that carries out P2P, and takies the UTRAN problem of resource.
Concrete technical scheme provided by the invention is as follows:
The invention provides a kind of method that realizes point-to-point peer-to-peer communications, comprise step:
A, select to carry out the communication channel of point-to-point peer-to-peer communications P2P by terminal; Wherein, in the time of outside the service range of base station, the described communication channel of selecting to carry out point-to-point peer-to-peer communications P2P by terminal specifically comprises step:
A2, as calling party's terminal direct communication paging channel by carrier sense technical monitoring configured in advance, and when confirming that it is idle, then utilize it to carry out paging, when the terminal responds that obtains as the callee, therefrom the top-quality channel conduct of selective channel and callee carry out the communication channel of P2P according to the channel environmental information of described terminal feedback as the callee and oneself channel environmental information;
B, carry out direct communication according to described P2P channel and opposite end.
Described steps A specifically comprises step:
A1, in the service range of base station the time, utilize idle channel to select the communication channel that at least one can carry out P2P as calling party's terminal, and therefrom determine the communication channel of carrying out P2P with the callee by the base station.
Described steps A 1 specifically comprises step:
A11, utilize idle channel to select the communication channel that at least one can carry out P2P as calling party's terminal; Then by and the base station between signaling channel send the communication request that communicates to the callee to the base station, and the environmental information and the positional information of oneself of selected communication channel sent to described base station;
A12, receive the communication request of described terminal when the base station after, call out the callee by paging channel;
After A13, described callee's terminal receives the paging of base station, utilize idle channel to select the communication channel that at least one can carry out P2P, and by and the base station between signaling channel send page-response message, and the environmental information and the positional information of oneself of selected communication channel sent to described base station by described page-response message;
A14, described base station determine and are fit to the two and carry out the communication channel of P2P according to the described terminal and the information of described callee's terminal to report as the calling party, and tell described as calling party's terminal and callee's terminal by described signaling channel.
In the steps A 11, the described idle channel that utilizes is selected the process that at least one can carry out the communication channel of P2P, specifically comprises step:
A111, search for whole frequencies around it by the carrier sense technology, measure and write down the received signal intensity of each frequency then, and determine spendable channel according to measurement result as calling party's terminal;
A112, select the proper cell registration and residently get off, and determine the channel that channel that described sub-district takies and adjacent cell take by the system broadcast message that receives described sub-district;
A113, removal has been determined in determined spendable channel described sub-district and the shared channel of adjacent cell, and in remaining channel, select one group of the most weak channel of signal strength signal intensity successively as the P2P channel.
In the steps A 14, described base station is determined and is fit to the two and carries out the process of the communication channel of P2P according to the described terminal and the information of described terminal to report as the callee as the calling party, specifically comprises step:
Described base station is according to described terminal and the two distance of the positional information calculation of described terminal to report as the callee radio range that whether satisfies P2P as the calling party, and then determine the communication channel that is fit to the two environment simultaneously according to the environmental information of described terminal to report when confirming to satisfy, and the communication channel of therefrom selecting the most suitable the two environment is as main channel.
Described steps A 2 specifically comprises step:
A21, as calling party's terminal direct communication paging channel by carrier sense technical monitoring configured in advance, and when confirming that it is idle, utilize it to carry out paging; Otherwise, continue this step;
A22, judge at the transmission paging signal number of times of regulation and whether receive in the time,, then indicate in callee's out of reach if do not receive as the replying of callee's terminal; If receive, then according to the channel environmental information of described terminal feedback as the callee and oneself channel environmental information therefrom top-quality channel conduct of selective channel and the communication channel of carrying out P2P as callee's terminal.
Described steps A 2 also comprises step:
After receiving paging signal as callee's terminal, judge whether to call out oneself, if then send answer signal, and the environmental information that will be fit to oneself to carry out the channel of P2P sends the terminal as the calling party to; Otherwise do not deal with.
Described step B specifically comprises step:
B1, the main channel that the base station is determined are divided into several slots, and determine, and in described communication time slot, determine and be used for the time slot that transmits the time slot of inter-terminal data information and be used for transmitting the control information of terminal room as calling party's terminal and as the communication time slot that carries out P2P between callee's the terminal;
B2, as calling party's terminal and as setting up the P2P link by determined communication time slot between callee's the terminal, and by and the base station between signaling channel notify described base station P2P link to set up to finish;
B3, as calling party's terminal and as callee's terminal by and the base station between signaling channel accept the control of base station, and the P2P link that passes through to be set up carries out the mutual of data service and control information.
Described step B specifically comprises step:
As calling party's terminal and as carrying out the mutual of data service and control information by selected P2P link between callee's the terminal.
Described step B also comprises step:
In carrying out the P2P process, as calling party's terminal and as the control information that utilizes maximum transmitting power to transmit the two between callee's the terminal; And,
Determine the minimum emissive power that uses separately according to the power information that Correspondent Node sends, and the data service of using the transmitting power of the minimum of determining to transmit the two.
The described power information that sends according to Correspondent Node is determined the process of the minimum emissive power that uses separately, specifically comprises step:
In carrying out the P2P process, sending control information or comprising separately power information during data service as calling party's terminal and as callee's terminal, after Correspondent Node receives described power information, obtain the transmission power level value according to described power information, the received power level value that measures according to described transmission power level value, oneself side then, and receiving sensitivity estimates minimum transmitted power, and sends data service to Correspondent Node according to the minimum transmit power that is estimated.
A kind of system that realizes point-to-point peer-to-peer communications comprises: terminal is used to select to carry out the communication channel of P2P, and carries out direct communication according to described P2P communication channel and opposite end; Wherein, described terminal selects to carry out the communication channel of P2P, specifically comprise: as calling party's terminal direct communication paging channel by carrier sense technical monitoring configured in advance, and when confirming that it is idle, then utilize it to carry out paging, when the terminal responds that obtains as the callee, therefrom the top-quality channel conduct of selective channel and callee carry out the communication channel of P2P according to the channel environmental information of described terminal feedback as the callee and oneself channel environmental information.
Described terminal comprises: input/output interface and point-to-point peer-to-peer communications P2P selected cell; Described input/output interface is used to transmit input signal and gives described P2P selected cell; Described P2P selected cell be used to determine whether to carry out P2P, and the information after will determining sends.
Described terminal also comprises: information process unit, baseband processing unit and RF processing unit; Information process unit is used to receive the information that described P2P selected cell sends out, and described information is handled, and the information after will handling sends described baseband processing unit to; Described baseband processing unit, the signal that is used for described information process unit is passed to carries out Base-Band Processing, and the signal after will handling passes to described RF processing unit; Described RF processing unit, the signal that is used for described baseband processing unit is passed to carries out modulation treatment, and the signal after will modulating passes to described input/output interface output.
The concrete technical scheme that provides by the invention described above as can be seen, the present invention brings following beneficial effect:
Owing to select to carry out the channel of direct communication by terminal among the present invention, be the terminal distribution Radio Resource that carries out P2P so do not need system, thereby can make this part Radio Resource have an opportunity to be reused with Correspondent Node.
Description of drawings
The traffic model of up-base station that Fig. 1 is traditional for prior art adopts-when the downlink communication pattern communicates;
Traffic model when Fig. 2 adopts the P2P pattern to communicate for prior art;
The scene schematic diagram that Fig. 3 may be in for the communication terminal that can adopt P2P provided by the invention;
Fig. 4 is the method flow diagram of first embodiment provided by the invention;
Fig. 5 is for carrying out the method flow diagram of dynamics of channels assigning process among first embodiment provided by the invention;
Fig. 6 is the structured flowchart of the terminal among the 3rd embodiment provided by the invention.
Embodiment
When two terminal rooms adopted the P2P modes to communicate, the terminal that participates in communication may be under as shown in Figure 3 several scenes: in the sub-district outside (scene 1), the sub-district (scene 3 and scene 4) and stride sub-district (scene 2).
Terminal use in scene 1 and the scene 2 all is positioned at the sub-district, and the base station also is located in the sub-district, so the terminal use in scene 1 and the scene 2 both can carry out direct communication, can also adopt traditional communication mode, different is need the information of carrying out between two adjacent base stations in the scene 2 mutual.
For scene 3, the base station is located in the sub-district, and one of them communication terminal is in the sub-district, and another terminal is outside the sub-district.
For scene 4, communication terminal and does not have the base station to participate in communication all outside the sub-district, so can only carry out P2P between communication terminal in this case.
Analysis through to above-mentioned each scene the invention provides two embodiment, and wherein first embodiment is at scene 1, scene 2 and the 3 times situations of terminal in the sub-district as the calling party of scene, and the control signaling is controlled by the base station under this situation.Second embodiment be at scene 3 times as calling party's the terminal situation of the situation in the sub-district and scene 4 not, under this situation, two communication terminals directly carry out P2P, do not have the base station that it is controlled.Respectively the specific implementation process of this two embodiment is described below.
First embodiment provided by the invention is a kind of method that realizes point-to-point peer-to-peer communications, its core is: by select to carry out the communication channel of point-to-point peer-to-peer communications P2P as calling party's terminal, and selected channel environmental information that goes out and the positional information of oneself are reported the base station by communication request, described base station is carried out paging according to the communication request as calling party's terminal to the terminal as the callee, behind the page response that obtains as callee's terminal, obtain as the channel environmental information of callee's terminal to report with and positional information, in conjunction with selecting the terminal that is suitable as the calling party simultaneously as the reporting information of calling party's terminal and carrying out the communication channel of P2P, be handed down to two terminals then then as callee's terminal room; The communication channel negotiation communication time slot determined according to the base station of latter two terminal, and set up the P2P link according to the communication time slot of being consulted, pass through the communication link data information of being set up at last.The specific implementation process of this embodiment comprises the steps: as shown in Figure 4
The specific implementation process of step 1 comprises:
At first, search for its whole frequencies on every side by the carrier sense technology, measure and write down the received signal intensity of each frequency then, and determine spendable channel according to measurement result as calling party's terminal.
Behind the starting up of terminal as the calling party, the same with the method for traditional communication, after at first entering search BCH state, will be by the whole frequency of carrier sense technology (or frequency scanning) search, measure and write down the received signal intensity of each frequency, so just can determine spendable channel according to measurement result.
Secondly, described terminal as the calling party is selected the proper cell registration and is residently got off, and determines the channel that channel that described sub-district takies and adjacent cell take by the system broadcast message that receives described sub-district;
Get off as calling party's terminal selection proper cell registration is also resident, and set up down-going synchronous, receive the system broadcasts in the sub-district then, comprise that cell channel is described, adjacent cell is described RF environmental informations such as (frequencies of adjacent cell use).
At last, in determined spendable channel, remove described sub-district and the shared channel of having determined of adjacent cell, and in remaining channel, select one group of the most weak channel of signal strength signal intensity successively as the communication channel that can carry out P2P.
Dynamics of channels distribution technique of the present invention by on-the-spot frequency sweep terminal receive around the signal strength signal intensity of channel determine the situation that takies of channel, confirm which frequency can use.Then by selecting in frequency point ranges according to situations such as the intensity of signal and interference as calling party's terminal, the method for selection is the arrangement of falling progressively of the intensity according to signal, avoids selecting the frequency that takies in this honeycomb and the contiguous honeycomb as far as possible.Adopt the dynamics of channels distribution technique to carry out process that dynamics of channels distributes as shown in Figure 5, comprise three functional steps:
S101, RF (radio frequency radio frequency) characterization: realize by the signal strength measurement of collecting to busy channel and channel.For each channel, measurement result deposits an array in by channel, all channels is sorted by descending order with measured value then.Wherein the number for the measurement result of each channel storage has a limit.Arrived this limit, held up-to-date measurement result with regard to abandoning the oldest measurement result.
S102, channel is selected process: choose channel according to top-down order in the seniority among brothers and sisters table of storing from described permutation table in the RF characterization, wherein will get rid of the channel that this sub-district and adjacent cell take.And before channel is selected, to carry out one-shot measurement, to guarantee the availability of channel to the performance of selected channel.If selected channel is unavailable, then still choose in other channel from described seniority among brothers and sisters table successively according to top-down order in the permutation table.
S103, channel monitoring process: for the channel performance of the idle channel that prevents to select still uses this channel to communicate after worsening, need carry out in real time selected idle channel or periodically monitoring, when finding the mis-behave of selected idle channel, then choose suitable idle channel again.
Through a series of processes in the step 1, finally select some as calling party's terminal and be fit to oneself carry out the idle channel of P2P transmission, implement following process then:
As calling party's terminal select be fit to oneself to carry out the idle channel of P2P transmission after, start random access procedure by Common Control Channel, behind random access procedure, described terminal as the calling party enters connection mode, that is to say described as the calling party terminal and UTRAN between set up a signaling control channel.Send communication request to UTRAN then, and in described request message, carrying described location information of terminals and the selected operable free channel information of described terminal.
After receiving the communication request that sends as calling party's terminal as UTRAN, send beep-page message to the callee by paging channel.
Receive the paging of base station when terminal after, make page response, and send described page response to described UTRAN by ascending control channel as the callee, the positional information of wherein carrying it with and the environmental information of operable idle channel.
Described base station is according to described terminal and the two distance of the positional information calculation of described terminal to report as the callee radio range that whether satisfies P2P as the calling party, and when confirming to satisfy then according to determining the communication channel that is fit to the two environment simultaneously as calling party's terminal and the environmental information that can carry out the communication channel of P2P as callee's terminal to report, and the communication channel of therefrom selecting the most suitable the two environment is as main channel, and it is notified to described terminal and callee.The specific implementation process of step 5 is as follows:
At first, whether described UTRAN satisfies the radio range that P2P requires according to the two distance of the positional information calculation of two terminal to report; If two terminal rooms do not satisfy the P2P radio range, then notify two terminals adopt traditional communication mode promptly up-base station-descending mode communicates; If two terminal rooms satisfy the P2P radio range, then described UTRAN is according to the information of the idle channel of selecting separately of two terminal to report, from wherein finding the idle channel that meets two terminal environments simultaneously, these available channels may be that one or a set of dispense are given described two terminals then, wherein select the main direct communication channel of the channel of the most suitable two terminals as two terminals, other the frequency hopping that can be used as is used, and starts two terminals and enter the direct communication pattern.
The specific implementation process of step 6 is as follows:
At first, the main channel that the base station is determined is divided into several slots, and determine as calling party's terminal and as the communication time slot that carries out P2P between callee's the terminal, and in described communication time slot, determine the time slot of the data message that is used for transmitting described terminal room, and the time slot that is used for transmitting the control information of described terminal room; Secondly, set up the P2P link by determined communication time slot between two communication terminals, and by and the base station between signaling channel notify described base station P2P link to set up to finish; At last, as calling party's terminal and as callee's terminal by and the base station between signaling channel accept the control of base station, and the P2P link that passes through to be set up carries out data message, and control information is mutual.
Be example with GSM (Global System for Mobile Communications, global system for mobile communications) below, the P2P direct communication process of two terminal rooms described:
In gsm system, usually the direct communication process is divided into two processes:
The negotiations process of at first executive communication mode:
Adopt dominant frequency point as carrier frequency, described dominant frequency is divided into 8 time slots handles transmission information, being used for wherein transmitted with the time slot of the signaling information of system divide away (in order to receive some signaling informations of cellular cell, wherein 0,2,4,6 time slots do not take, that is to say four time slots be being used for of being provided with in advance of system transmit and the base station between the time slot of interactive signaling information), remaining four time slot is carried out the communication time slot of P2P as two terminal rooms, and in described communication time slot, determine the time slot of the data message that is used for transmitting two terminal rooms, and the time slot that is used for transmitting the control information of two terminal rooms, such as 1 time slot is the control time slot, be used for transmitting RTC (Request To Communication, the request communication) control signal of two terminal rooms; 3,5 and 7 time slots are used for transmitting the data message of two terminal rooms.
After time slot was divided and finished, the terminal of calling party's one side just can adopt the downstream frequency emission of dominant frequency point, and upstream frequency receives; The terminal of callee's one side is then waited for the rtc signal in the terminal transmission of 1,3,5,7 time slot waiting calling sides of the downstream frequency of dominant frequency point, one side.
Communicating pair adopts handshake mechanism to consult to set up communication link: the terminal of calling party's one side sends rtc signal at the time slot of regulation to the base station, the callee is called out in the base station, after the terminal of callee's one side receives rtc signal, send ACK (answer signal) signal and give the base station, described base station is transmitted described ACK acknowledge message and is given the calling party, after the terminal of calling party's one side is received ack signal, set up communication link with the terminal room of callee's one side, simultaneously by and the base station between signaling channel informing base station communication link set up.If the terminal of calling party's one side is not received ack signal at the appointed time certainly, can resend ack signal by prior regulation, if surpass the number of times that sends, with informing base station, the base station can be that both sides connect with traditional communication mode.
Through after the above-mentioned negotiations process, two terminal rooms have been set up communication link, enter communication process afterwards:
As calling party's terminal with carry out communicating by letter of P2P as callee's terminal setting up communication time slot good through consultation on the good communication link, and by mutual signaling information between the time slot reserved and base station, so that accept the control of base station.
In communication process, adopt Data transmission business information and the control information between the two in the P2P process of adaptive power control technology between communicating pair, and transmit signaling information between communicating pair and base station.The core of described adaptive power control technology is: transmit signaling information between communication terminal and base station and the control information between two communication terminals of setting up P2P with maximum power capability, as RTC and ACK information; With minimal power Data transmission business information between two communication terminals of setting up P2P.
Generally, terminal requires to carry power information when sending signal in the grouping information that sends, receiving terminal obtains the transmission power level value according to the power information that receives, and the sensitivity (its implication is just can guarantee that node correctly receives grouping information as long as the level of received power is higher than this sensitivity) of received signal power level value of measuring according to described transmission power level value, oneself side and received signal can estimate and carry out direct communication between communication terminal and be used for the minimum power of Data transmission business information then.For example: suppose that Ri is the sensitivity of the received signal of node i; Rj, when i represents that node j sends grouping with transmitted power, the received signal power level that node i is measured, this moment the node j that then determines minimum transmit power be exactly make node i received power level just for receiving sensitivity (be Rj, the transmitted power of the node j in the time of i=Ri).
Second embodiment provided by the invention is the another kind of method that realizes point-to-point peer-to-peer communications, it is primarily aimed at scene 3 and the 4 times situations of terminal outside the sub-district as the calling party of scene, and its core is: the direct communication paging channel paging called partner that passes through configured in advance as calling party's terminal; When obtaining callee's terminal responds, described callee then is described in service area, so continue to carry out P2P by described direct communication paging channel and described callee's terminal.The specific implementation process of this embodiment is as follows:
At first, as calling party's terminal direct communication paging channel by carrier sense technical monitoring configured in advance, and when confirming that it is idle, then utilize it to carry out paging, when the terminal responds that obtains as the callee, determine according to the channel environmental information of described terminal to report as the callee and the channel environmental information of oneself and to be fit to the two and to carry out the communication channel of P2P, and use itself and terminal to communicate as the callee.
For scene 3 and 4 times the situations of terminal outside the sub-district of scene as the calling party, a special direct communication paging channel (being similar to the paging channel of sub-district) need be set in advance, be used for carrying out the paging of P2P.Terminal when the state of standby, except monitoring the system information of subdistricts, also will be by carrier sense technical monitoring direct communication paging channel, if channel idle is then carried out paging; If channel is used or clashes, then waiting for a period of time at random reattempts transmission.Specific implementation process comprises:
Step 11 as calling party's the terminal direct communication paging channel by carrier sense technical monitoring configured in advance, and when confirming that it is idle, utilizes it to carry out paging, and execution in step 12 then; Otherwise, continue this step.
After the terminal as the callee receives paging signal, judge whether calling out oneself, if then send answer signal, and oneself channel environmental information is reported terminal as the calling party; Otherwise do not deal with.
Step 12,, is then indicated in callee's out of reach if do not receive the transmission paging signal number of times of regulation and the replying of terminal of whether receiving callee's one side in the time as calling party's terminal judges; If receive, then be fit to the two idle channel that carries out P2P and carry out the direct channel of P2P as the two according to selecting as the channel environmental information of the channel environmental information of callee's terminal to report and oneself side, then the channel circumstance of described idle channel is checked, guarantee that described idle channel is glitch-free, and in the direct communication paging channel, specify frequency information as direct communication.After specifying like this, the callee just can directly wait on allocated channel, waits for direct communication.Can reduce influence like this to terminal in the cellular system.
Through after the above-mentioned steps,, afterwards, utilize the direct communication between two communication terminals of described P2P passage realization by determined to carry out the communication channel of point-to-point peer-to-peer communications P2P as calling party's terminal.
The foregoing description is not only applicable to gsm system, but also is applicable to (the Time divisionduplex based on TDD; Time division duplex) communication system of technology, as PHS (Personal Handyphone System, personal handyphone system) and TD-SCDMA (time-division synchronous CDMA system, be one of 3G network standard of 3GPP tissue definition) and CDMA (Code Division Multiple Addressing, code division multiple access) system.
The 3rd embodiment provided by the invention is a kind of system that realizes point-to-point peer-to-peer communications, this system comprises terminal, the structured flowchart of wherein said terminal comprises input/output interface, P2P selected cell, information process unit, baseband processing unit and RF processing unit as shown in Figure 6.
When input signal arrived described terminal, described terminal passed to described P2P selected cell by described input/output interface.
Described P2P selected cell determines whether that according to the signal of described input/output interface input needs carry out P2P, and the information after will determining passes to described information process unit by signal.
Described information process unit calls corresponding handling procedure the signal that described P2P selected cell passes to is handled, and the signal after will handling passes to described baseband processing unit.
Described baseband processing unit be used to handle the signal that described information process unit passes to, and the signal after will handling passes to described RF processing unit.
Described RF processing unit, the signal that is used for described baseband processing unit is passed to carries out modulation treatment, and the signal after will modulating passes to described input/output interface.
For the function of the existing terminal of compatibility, the present invention still keeps being connected between described input/output interface and the information process unit.After handling like this, when received signal, after input/output interface sent input signal to described RF processing unit, described RF processing unit carried out demodulation process to described input signal, and the signal after the demodulation is passed to described baseband processing unit; The signal of described baseband processing unit after to described RF processing unit demodulation carries out Base-Band Processing, and the signal after will handling passes to described information process unit; After the signal that described information process unit sends to described baseband processing unit is handled, directly send described input/output interface to and send out.
When needs send signal, will input to described information process unit with the signal that sends by input/output interface; Described information process unit is handled the signal that described input/output interface inputs to, and the signal after will handling sends described baseband processing unit to; Described baseband processing unit carries out Base-Band Processing to the signal that described information process unit sends to, and the signal that will obtain after will handling sends described RF processing unit to; After the signal that described RF processing unit sends to described baseband processing unit carries out radio frequency processing, send described input/output interface to; Described input/output interface sends out the signal that described RF processing unit sends to.
By the specific embodiments of the invention described above as can be seen, the present invention determines the method for the direct communication channel between communication terminal can not take the resource of UTRAN by terminal, thus the utilization again that can make this part resource of described UTRAN have an opportunity to obtain.In addition,, can remedy some that exist in the cellular system to a certain extent and cover defectives, as the dead band etc. by the present invention; But also can realize the transfer of flow, alleviate the call congestion that causes because capacity is saturated the hot spot region to a certain extent and switch chain rupture.Moreover, when not having infrastructure support or basis to implement to damage, still can realize in-plant local professional by the present invention by the present invention.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (14)
1. a method that realizes point-to-point peer-to-peer communications is characterized in that, comprises step:
A, select to carry out the communication channel of point-to-point peer-to-peer communications P2P by terminal; Wherein, in the time of outside the service range of base station, the described communication channel of selecting to carry out point-to-point peer-to-peer communications P2P by terminal specifically comprises step:
A2, as calling party's terminal direct communication paging channel by carrier sense technical monitoring configured in advance, and when confirming that it is idle, then utilize it to carry out paging, when the terminal responds that obtains as the callee, therefrom the top-quality channel conduct of selective channel and callee carry out the communication channel of P2P according to the channel environmental information of described terminal feedback as the callee and oneself channel environmental information;
B, carry out direct communication according to described P2P channel and opposite end.
2. the method for claim 1 is characterized in that, described steps A specifically comprises step:
A1, in the service range of base station the time, utilize idle channel to select the communication channel that at least one can carry out P2P as calling party's terminal, and therefrom determine the communication channel of carrying out P2P with the callee by the base station.
3. method as claimed in claim 2 is characterized in that, described steps A 1 specifically comprises step:
A11, utilize idle channel to select the communication channel that at least one can carry out P2P as calling party's terminal; Then by and the base station between signaling channel send the communication request that communicates to the callee to the base station, and the environmental information and the positional information of oneself of selected communication channel sent to described base station;
A12, receive the communication request of described terminal when the base station after, call out the callee by paging channel;
After A13, described callee's terminal receives the paging of base station, utilize idle channel to select the communication channel that at least one can carry out P2P, and by and the base station between signaling channel send page-response message, and the environmental information and the positional information of oneself of selected communication channel sent to described base station by described page-response message;
A14, described base station determine and are fit to the two and carry out the communication channel of P2P according to the described terminal and the information of described callee's terminal to report as the calling party, and tell described as calling party's terminal and callee's terminal by described signaling channel.
4. method as claimed in claim 3 is characterized in that, in the steps A 11, the described idle channel that utilizes is selected the process that at least one can carry out the communication channel of P2P, specifically comprises step:
A111, search for whole frequencies around it by the carrier sense technology, measure and write down the received signal intensity of each frequency then, and determine spendable channel according to measurement result as calling party's terminal;
A112, select the proper cell registration and residently get off, and determine the channel that channel that described sub-district takies and adjacent cell take by the system broadcast message that receives described sub-district;
A113, removal has been determined in determined spendable channel described sub-district and the shared channel of adjacent cell, and in remaining channel, select one group of the most weak channel of signal strength signal intensity successively as the P2P channel.
5. method as claimed in claim 3, it is characterized in that, in the steps A 14, described base station is determined and is fit to the two and carries out the process of the communication channel of P2P according to the described terminal and the information of described terminal to report as the callee as the calling party, specifically comprises step:
Described base station is according to described terminal and the two distance of the positional information calculation of described terminal to report as the callee radio range that whether satisfies P2P as the calling party, and then determine the communication channel that is fit to the two environment simultaneously according to the environmental information of described terminal to report when confirming to satisfy, and the communication channel of therefrom selecting the most suitable the two environment is as main channel.
6. the method for claim 1 is characterized in that, described steps A 2 specifically comprises step:
A21, as calling party's terminal direct communication paging channel by carrier sense technical monitoring configured in advance, and when confirming that it is idle, utilize it to carry out paging; Otherwise, continue this step;
A22, judge at the transmission paging signal number of times of regulation and whether receive in the time,, then indicate in callee's out of reach if do not receive as the replying of callee's terminal; If receive, then according to the channel environmental information of described terminal feedback as the callee and oneself channel environmental information therefrom top-quality channel conduct of selective channel and the communication channel of carrying out P2P as callee's terminal.
7. method as claimed in claim 6 is characterized in that, described steps A 2 also comprises step:
After receiving paging signal as callee's terminal, judge whether to call out oneself, if then send answer signal, and the environmental information that will be fit to oneself to carry out the channel of P2P sends the terminal as the calling party to; Otherwise do not deal with.
8. method as claimed in claim 2 is characterized in that, described step B specifically comprises step:
B1, the main channel that the base station is determined are divided into several slots, and determine, and in described communication time slot, determine and be used for the time slot that transmits the time slot of inter-terminal data information and be used for transmitting the control information of terminal room as calling party's terminal and as the communication time slot that carries out P2P between callee's the terminal;
B2, as calling party's terminal and as setting up the P2P link by determined communication time slot between callee's the terminal, and by and the base station between signaling channel notify described base station P2P link to set up to finish;
B3, as calling party's terminal and as callee's terminal by and the base station between signaling channel accept the control of base station, and the P2P link that passes through to be set up carries out the mutual of data service and control information.
9. the method for claim 1 is characterized in that, described step B specifically comprises step:
As calling party's terminal and as carrying out the mutual of data service and control information by selected P2P link between callee's the terminal.
10. method as claimed in claim 8 or 9 is characterized in that described step B also comprises step:
In carrying out the P2P process, as calling party's terminal and as the control information that utilizes maximum transmitting power to transmit the two between callee's the terminal; And,
Determine the minimum emissive power that uses separately according to the power information that Correspondent Node sends, and the data service of using the transmitting power of the minimum of determining to transmit the two.
11. method as claimed in claim 10 is characterized in that, the described power information that sends according to Correspondent Node is determined the process of the minimum emissive power that uses separately, specifically comprises step:
In carrying out the P2P process, sending control information or comprising separately power information during data service as calling party's terminal and as callee's terminal, after Correspondent Node receives described power information, obtain the transmission power level value according to described power information, the received power level value that measures according to described transmission power level value, oneself side then, and receiving sensitivity estimates minimum transmitted power, and sends data service to Correspondent Node according to the minimum transmit power that is estimated.
12. a system that realizes point-to-point peer-to-peer communications is characterized in that, comprising:
Terminal is used to select to carry out the communication channel of P2P, and carries out direct communication according to described P2P communication channel and opposite end; Wherein, described terminal selects to carry out the communication channel of P2P, specifically comprises:
As calling party's terminal direct communication paging channel by carrier sense technical monitoring configured in advance, and when confirming that it is idle, then utilize it to carry out paging, when the terminal responds that obtains as the callee, therefrom the top-quality channel conduct of selective channel and callee carry out the communication channel of P2P according to the channel environmental information of described terminal feedback as the callee and oneself channel environmental information.
13. system as claimed in claim 12 is characterized in that, described terminal comprises:
Input/output interface and point-to-point peer-to-peer communications P2P selected cell;
Described input/output interface is used to transmit input signal and gives described P2P selected cell;
Described P2P selected cell be used to determine whether to carry out P2P, and the information after will determining sends.
14. system as claimed in claim 13 is characterized in that, described terminal also comprises:
Information process unit, baseband processing unit and RF processing unit;
Information process unit is used to receive the information that described P2P selected cell sends out, and described information is handled, and the information after will handling sends described baseband processing unit to;
Described baseband processing unit, the signal that is used for described information process unit is passed to carries out Base-Band Processing, and the signal after will handling passes to described RF processing unit;
Described RF processing unit, the signal that is used for described baseband processing unit is passed to carries out modulation treatment, and the signal after will modulating passes to described input/output interface output.
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| CN2006101119352A CN101132617B (en) | 2006-08-24 | 2006-08-24 | Method and system for implementing point-to-point peer communication |
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| CN2006101119352A CN101132617B (en) | 2006-08-24 | 2006-08-24 | Method and system for implementing point-to-point peer communication |
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| CN101132617B true CN101132617B (en) | 2010-08-04 |
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Effective date of registration: 20210427 Address after: Unit 3401, unit a, building 6, Shenye Zhongcheng, No. 8089, Hongli West Road, Donghai community, Xiangmihu street, Futian District, Shenzhen, Guangdong 518040 Patentee after: Honor Device Co.,Ltd. Address before: 518129 Bantian HUAWEI headquarters office building, Longgang District, Guangdong, Shenzhen Patentee before: HUAWEI TECHNOLOGIES Co.,Ltd. |