CN100591163C - Method of implementing SCDMA system terminal-to-terminal direct communication and uses thereof - Google Patents
Method of implementing SCDMA system terminal-to-terminal direct communication and uses thereof Download PDFInfo
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Abstract
The invention provides a method of realizing the direct communication between terminals of a SCAMA system and the application of the method. The invention comprises the steps that each signal frame emitted by a sender terminal carries SYNC, and a receiver terminal obtains the synchronization with the sender terminal based on SYNC. Based on the synchronization established between the sender terminal and the receiver terminal, the receiver terminal receives and demodulates the signal frame from the sender terminal. The method of the invention makes full advantage of the prior SCDMA system technology and redesigns the prior physical layer frame structure of the SCAMA system, so as to realize the direct communication between terminals of the SCAMA system.
Description
Technical field
The present invention relates to relate in particular to a kind of method and application that realizes direct communication between S-CDMA (SCDMA) system terminal and the terminal in the method and the application that realize direct communication between terminal and the terminal under the situation that does not have network signal to cover.
Background technology
Along with development of Communication Technique, under the situation that does not have network signal to cover, how to realize that direct communication just becomes one of problem of people's concern between terminal and the terminal.Usually, terminal and the direct communication mode between the terminal that will carry out under the situation that does not have network signal to cover of technical staff is called network-off direct-passing pattern (DMO).
Wherein, entering of DMO pattern needs human intervention, only just allows to enter the DMO pattern after terminal exceeds the scope that network signal covers.In addition, whether terminal base stations detected signal periodically also after entering the DMO pattern detects current terminal and is covered by network signal; When terminal is covered by network signal, its network schemer that will reset automatically, thus avoid of the interference of DMO pattern to existing network.In addition, terminal also can withdraw from the DMO pattern by human intervention.
When adopting the DMO pattern, the user can be provided with frequency, professional code channel (VCC code channel) and transmitting power to terminal by terminal interface; Because terminal can be preserved the relevant data that the user is provided with automatically, the user can at any time carry out above-mentioned setting operation, as long as the user with frequency, VCC code channel and the transmitting power of its terminal be provided with the group of same cluster group character (GID) in other-end identical, then under the situation that does not have network signal to cover, as long as one of them terminal is required to enter the DMO pattern, other-end just also can enter the DMO pattern in the group of same GID.As shown in Figure 1, be the application schematic diagram of the DMO pattern of a plurality of terminals in the prior art, wherein, terminal adopts to be monitored the mode that afterwards sends earlier and makes a call, and the interior other-end of the group of same GID can be listened to and obtain.In addition, in the DMO pattern, forbid being in the terminal initiation exhalation of accepting state, in order to avoid the mutual collision of terminal room.
In summary, under the situation that does not have network signal to cover, communicate, end or in emergency circumstances can't relate to the generation of situations such as the relevant personnel suddenly owing to there is not the network coverage thereby avoid communicating by letter by the DMO pattern.In view of above-mentioned, how to make numerous SCDMA user when terminal is not covered by the SCDMA network signal, also can carry out the communication of DMO pattern, and how to realize that according to the existing physical layer frame structure of SCDMA system (as shown in Figure 2) communication of DMO pattern has become the problem of being eager to solve in the present communications field.
Summary of the invention
Technical problem to be solved by this invention is the prior art that how to make full use of the SCDMA system, under the situation that does not have the SCDMA network signal to cover, realize the direct communication between SCDMA system terminal and the terminal, promptly realize the DMO pattern, thereby realize semiduplex conversation or short message service between the SCDMA system terminal.
Wherein, basic thought of the present invention is: the signal frame of the every frame of sending side terminal emission all carries synchronizing symbol (SYNC), receiving side terminal according to this SYNC obtain with sending side terminal synchronously; Set up on the synchronous basis signal frame of receiving side terminal receiving demodulation sending side terminal emission at receiving-transmitting sides.
For achieving the above object, the invention provides the method for a kind of SCDMA of realization system terminal and terminal direct communication, wherein this SCDMA system terminal comprises sending side terminal and receiving side terminal at least, this method mainly comprises the steps:
Step 1: sending side terminal carries the signal frame of SYNC and GID according to its physical layer frame structure emission;
Step 2: a plurality of receiving side terminals of same GID look for the processing of relevant peaks and synchronous points and described sending side terminal to set up synchronously after looking for boundary belt earlier;
Step 3: described receiving side terminal after setting up synchronously with described sending side terminal, the described signal frame of receiving demodulation and keeping synchronously simultaneously;
Wherein, described physical layer frame structure comprises tactic successively from front to back:
SYNC takies 4 symbols, and content is 1 entirely, is used to make described receiving side terminal to obtain to receive synchronously, carrier wave recovers and the time proofreaies and correct;
Reference symbol (REF) takies 1 symbol, and content is a binary digit 10, carries out the reference symbol that differential quadrature phase keying (DQPSK) (DQPSK) is separated timing as described receiving side terminal;
Number of frames (FN) takies 3 symbols, and value is 0～63;
GID takies 8 symbols, and content-length is 2 bytes;
Distinguished symbol (SW) takies 1 symbol, is used to discern the information content that described signal frame loads, and wherein 00,01,10 and 11 represent that successively described signal frame is voice signal or short message information, empty frame, control signal and stick signal;
Cyclic redundancy check (CRC) position (CRC) takies 3 symbols, is used for FN, GID and SW that described receiving side terminal receives are carried out cyclic redundancy check (CRC);
Modulated voice signal or short message information (V) take 96 symbols, and it is for carrying out the 192bit data after 1/2 convolutional encoding to the packed data of 96bit;
Protected field (G) takies 12 symbols, and described sending side terminal is not launched this protected field when the described signal frame of emission.
Further, described method also comprises: described sending side terminal is set a Walsh sequence according to user's request.Wherein, described sending side terminal uses the Walsh sequence of described setting that all the elements in the described physical layer frame structure are modulated; Described receiving side terminal uses the Walsh sequence of described setting that its signal frame that receives is carried out demodulation.It should be noted that among the present invention that the relevant technologies of using the Walsh sequence to carry out modulation is identical with the modulation technique of existing SCDMA system.
Further, described sending side terminal at first carries out 1/2 convolution to the modulated voice signal in the described physical layer frame structure or short message information and adds the processing that interweaves, with the DMO pattern communication that improves the SCDMA system terminal ability to bear to channel situation complicated and changeable, the Walsh sequence that re-uses setting is modulated all the elements in the telling physical layer frame structure.
Further, in described step 2, described receiving side terminal is looked for boundary belt according to following steps, promptly carries out synchronously thick:
1) receiving side terminal receives 130 symbols of sending side terminal emission, and these 130 symbols is removed to ask behind the direct current energy of each symbol;
2) receiving side terminal is done the maximum rising edge of asking energy after the smoothing processing to the energy of described each symbol, and the original position that should the maximum rising edge transmits as sending side terminal;
3) receiving side terminal receives the time of beginning according to described original position adjustment.
Further, in described step 3, described receiving side terminal keeps synchronously according to following steps: receiving side terminal is the smart synchronous points of search in the scope of each 30 chip at least in the front and back of a last signal frame synchronous points; And do not need to consider the influence of factors such as co-channel interference this moment.
For achieving the above object, the present invention also provides the system of a kind of SCDMA of realization system terminal and terminal direct communication, this SCDMA system terminal comprises sending side terminal and receiving side terminal at least, and this receiving side terminal comprises modulator-demodulator (MDM) and main control unit (MCU) at least, and wherein this application mainly comprises the steps:
Step 1: described MDM after 320ms is waken up by described MCU, by sleep (Sleep) state transitions to synchronous (Resync) state again;
Step 2: described MDM search is synchronous, and carries out state transitions according to Search Results; Wherein,
If described MDM finds synchronously at the frequency of himself setting, and the CRC that searches is correct, and the GID that the GID that searches sets with himself is identical, and then described MDM to reception (RX) state, and feeds back to Search Results described MCU by the Resync state transitions simultaneously;
If described MDM does not find synchronously at the frequency of himself setting, or the some signal frame CRC of demodulation are all incorrect continuously, or the GID of the GID that searches and himself setting is inequality, and then described MDM feeds back to described MCU with Search Results, and carries out state transitions according to the order of described MCU.
Further, after described MDM transfers to the RX state, comprising:
1) signal frame of the described sending side terminal transmission of described MDM receiving demodulation;
2) described MDM judges whether it receives link that described sending side terminal sends and discharge (Link_release) order, and described MCU judges whether variation of communication channel quality simultaneously; Wherein,
If described MDM receives described Link_release order, then MDM will stop the receiving demodulation signal frame, and send described Link_release order to described MCU, change the Sleep state afterwards over to; Otherwise described MDM continues the signal frame that the receiving demodulation sending side terminal sends;
If described MCU judges the communication channel quality variation, and described MDM loses synchronously and continuous some signal frame CRC of receiving demodulation are all incorrect, then described MDM changes the Resync state over to according to the Resync order that described MCU sends, and gives for change synchronously by the mode that enlarges the synchronous searching scope; Otherwise described MDM continues the signal frame that the receiving demodulation sending side terminal sends; Wherein,
Do not return synchronously if the continuous several times of described MDM are all looked for again synchronously, then described MDM changes the Sleep state over to according to reception (Stop_RX) order that stops that described MCU sends.
For achieving the above object, the present invention also provides the system of a kind of SCDMA of realization system terminal and terminal direct communication, and this SCDMA system terminal comprises MDM and MCU at least, and wherein this application mainly comprises the steps:
Step 1: after described MDM is waken up by described MCU, by the Sleep state transitions to frequency sweep (Scan_freq) state; Wherein, described MDM by the Sleep state transitions to time interval of Scan_freq state be a few minutes;
Step 2: described MDM carries out frequency sweep to be handled, and the frequency sweep result is fed back to described MCU, changes the Sleep state afterwards over to; Wherein,
If described frequency sweep result does not cover for there being the SCDMA network signal, then described MDM will carry out state transitions according to the order of described MCU; Otherwise sending side terminal and receiving side terminal will withdraw from the pattern of described terminal and terminal direct communication.
Wherein, the MDM that is in the Sleep state is waken up once by described MCU every 320ms.
Further, described MDM enters and withdraws from the Sleep state and mainly comprises the steps:
1) result after described MDM is waken up by described MCU according to it judges whether to enter the Sleep state; Wherein,
Result after described MDM is waken up comprises at least: MDM does not find synchronously at the frequency of himself setting, or the some signal frame CRC of demodulation are all incorrect continuously, or the GID of the GID that searches and himself setting is inequality; MDM receives the Link_release order that described sending side terminal sends; MDM receives Stop_TX order or the Stop_RX order that described MCU sends; MDM finishes frequency sweep and handles;
If the result of described MDM after being waken up is a kind of in the above-mentioned result, then described MDM sends interruptions of sleep to described MCU, and enters the Sleep state; Otherwise described MDM continues to handle accordingly according to the order that described MCU sends;
2) described MCU is after receiving described interruptions of sleep, calculate himself the length of one's sleep, the initial value of its sleep timer (WaitTimer) is set and starts described WaitTimer; And described MCU enters the Sleep state after the initialization of sleeping;
3) after described WaitTimer timing finishes, wake described MCU up;
4) described MCU sends the sleep awakening interruption to described MDM and wakes MDM up;
5) described MDM communicates by letter with described MCU, and carries out state transitions according to the order that described MCU sends.
Adopt the method for realization SCDMA system terminal of the present invention and terminal direct communication, it is making full use of on the basis of existing SCDMA systems technology with the least possible change, by the existing physical layer frame structure of SCDMA system is redesigned, realized the direct communication between SCDMA system terminal and the terminal.The present invention by sending side terminal all the elements in the SCDMA physical layer frame structure that resets is modulated with the Walsh sequence of same setting and receiving side terminal uses the Walsh sequence of this setting that its signal frame that receives and PN_Walsh are carried out associative operation, for the demodulation process of the back of receiving side terminal provides convenience; And the present invention adds the channel coding/decoding technology that interweaves by adopting convolution, has improved the ability to bear of the DMO pattern communication of SCDMA system terminal to channel situation complicated and changeable well.
Description of drawings
Fig. 1 is the application schematic diagram of the DMO pattern of a plurality of terminals in the prior art;
Fig. 2 is the existing physical layer frame structure schematic diagram of SCDMA system;
Fig. 3 is 10 frame format schematic diagrames of the SCDMA system physical layer frame structure of the present invention's redesign;
Fig. 4 realizes the method flow diagram of SCDMA system terminal and terminal direct communication for the present invention;
Fig. 5 realizes the application schematic diagram of the method for SCDMA system terminal and terminal direct communication for the present invention;
Fig. 6 is a sleep schematic flow sheet of the present invention.
Embodiment
Below in conjunction with accompanying drawing, concrete enforcement of the present invention is described in further detail.
In the DMO pattern, can receiving side terminal find the synchronizing information of sending side terminal, and to keep with it be key technology during the DMO pattern is used synchronously.The solution route that the present invention proposes is that the signal frame of the every frame emission of sending side terminal all carries SYNC, receiving side terminal according to this SYNC obtain with sending side terminal synchronously; Set up on the synchronous basis signal frame of receiving side terminal receiving demodulation sending side terminal emission at receiving-transmitting sides.
The concrete function of the DMO pattern of SCDMA system terminal of the present invention realizes that principle is: SCDMA system terminal DMO pattern one that is pressed pushes to talk behind (PTT) key, it can be transferred to the TX state, be transmitted into aerial after the short message information modulation of giving with speech signal coding modulation or with the upper strata, and the signal frame of every frame emission all carries the GID information of SYNC and group, other SCDMA system terminals in the same GID group are by constantly detecting, the SYNC that finds sending side terminal to send, and set up with it synchronously, the signal frame that the receiving demodulation sending side terminal sends on synchronous basis restores short message information after voice or the demodulation and sends to the upper strata and handle after the decoding.In addition, the unpromising realization of the present invention DMO pattern and be SCDMA system terminal specialized designs PTT key is the PTT key with an existing key definition in the SCDMA system terminal just.
In order to realize the direct communication between SCDMA system terminal and the terminal, the application that the present invention is directed to the DMO pattern redesigns the existing physical layer frame structure of SCDMA system.10 frame formats of the SCDMA system physical layer frame structure of the present invention's redesign are pressed above-mentioned frame structure as shown in Figure 3, and in the DMO pattern, the every frame of sending side terminal need be launched 116 symbols, add up to 9.0625ms, and other 12 symbols (being G) are not launched.
In order to make full use of existing SCDMA technology, modulation demodulation system in the DMO of SCDMA system terminal of the present invention pattern is still continued to use the DQPSK of existing SCDMA system, wherein, G.729D the vocoder in the DMO of SCDMA system terminal of the present invention pattern is still selected, voice rate is 6.4K and add Bose-Chaudhuri-Hocquenghem Code; The decoding process of receiving side terminal still adopts the Viterbi coding soft decision, after process emulation relatively, and the method that the method for differential ference spiral still adopts conjugation to take advantage of.In addition, the CRC check mode of in the mode of the CRC check of in the DMO of SCDMA system terminal of the present invention pattern the control section in the frame structure of above-mentioned redesign being carried out and the existing SCDMA system control section in the MUX1D frame structure being carried out is consistent, and all is to obtaining to the useful information of the CRC 24bit before XOR of tabling look-up after the REF.
For ease of the demodulation process of receiving side terminal back, an improvement of the present invention is: sending side terminal can be set a Walsh sequence according to user's request.In follow-up modulation operation, sending side terminal uses the Walsh sequence of this setting that all the elements in the SCDMA physical layer frame structure that resets are modulated afterwards; Receiving side terminal uses the Walsh sequence of this setting that its signal frame that receives is carried out demodulation.But it should be noted that among the present invention that the relevant technologies of using the Walsh sequence to carry out modulation is identical with the modulation technique of existing SCDMA system.In the present embodiment, specifically can set the Walsh sequence according to following steps: the 1) sequence number of the Walsh sequence of the human-computer interface module of sending side terminal (MMI module) recording user input, and this sequence number is reported the MDM of sending side terminal; Wherein this sequence number is 0～31 integer; 2) MDM retrieves the Walsh sequence of this sequence number correspondence in 32 Walsh sequences of its storage according to this sequence number; Wherein the Walsh sequence of retrieving out this moment is the Walsh sequence that above-mentioned sending side terminal is set.In addition, if the user has imported wrong sequence number, then sending side terminal can be waited for user's input once more, until retrieving corresponding Walsh sequence.
Below in conjunction with Fig. 4, as follows to the specific implementation procedure declaration of SCDMA system terminal of the present invention and terminal direct communication.
Step 1: sending side terminal carries the signal frame of SYNC and GID according to the above-mentioned physical layer frame structure emission that resets;
Be specially: sending side terminal is in the transmission time slot of this 9ms, do G.729 speech coding earlier, 48Symbol voice or the ECS bag that speech coding is obtained carries out 1/2 convolutional encoding then, carry out interleaving treatment at last, the frame of delaying time, the Walsh sequence of using its setting at next 9ms transmission time slot sending side terminal is modulated above-mentioned coding, the result that interweaves and is launched.
Step 2: a plurality of receiving side terminals of same GID look for the processing of relevant peaks and synchronous points and sending side terminal to set up synchronously after looking for boundary belt earlier;
Be specially: 1) receiving side terminal is looked for boundary belt, promptly carries out synchronously thick;
Because the every 10ms of sending side terminal will launch 116 symbols in the DMO of SCDMA system terminal application model; all the other 12 symbols are not launched; and do not process for the collision between the terminal emission; and need to rely on the operative skill of user to the SCDMA system terminal that works in the DMO pattern, so can simplify about the existing relatively SCDMA technology of the algorithm of looking for boundary belt among the present invention.And; in the DMO of SCDMA system terminal application model; SCDMA system terminal periodically (time interval is a few minutes) detects network signal; in case detected available frequency; the SCDMA network coverage is promptly arranged, and then the SCDMA system terminal will be by the DMO mode switch to network schemer, so; the boundary belt of looking in the DMO application model just can be considered the influence that base station transmit signals and terminal transmit, and Rule of judgment is simplified more.
In sum, it is the same substantially with existing SCDMA technology to carry out thick synchronous algorithm in the DMO of SCDMA system terminal application model, be: receiving side terminal receives 130 symbols of sending side terminal emission, and these 130 symbols is removed to ask behind the direct current energy of each symbol; Receiving side terminal is done the maximum rising edge of asking energy after the smoothing processing to the energy of described each symbol, and the original position that should the maximum rising edge transmits as sending side terminal; Receiving side terminal receives the time of beginning according to described original position adjustment.
2) receiving side terminal is looked for the processing of relevant peaks and synchronous points, and promptly receiving side terminal is proceeded synchronously smart on thick synchronous basis;
Because the present invention is when redesigning the physical layer frame structure of SCDMA system for the application that realizes the DMO pattern, just pay special attention to existing SCDMA system in the MUX1D frame structure in SYNC on number and position, be consistent, so in the present invention, receiving side terminal looks for the rudimentary algorithm flow process and the existing SCDMA technology of the processing of relevant peaks and synchronous points to remain unchanged.
Step 3: receiving side terminal after setting up synchronously with sending side terminal, the signal frame of receiving demodulation sending side terminal emission and keeping synchronously simultaneously;
Wherein the receiving demodulation process is specially: receiving side terminal is in the receiving slot of a 9ms, and when receiving this frame aerial signal, the Walsh sequence of using sending side terminal to set is carried out demodulation to this aerial signal; And meanwhile, receiving side terminal carries out deinterleaving to the data that previous frame receives, and carries out Viterbi decoding subsequently, and then carries out G.729 tone decoding.
About synchronous maintenance, because terminal is more complicated and changeable to the wireless channel between the terminal in the DMO of SCDMA system terminal pattern is used, so the simultaneous bias of every frame signal frame can be Comparatively speaking bigger in the process that the DMO pattern receives, this just needs receiving side terminal when every frame signal frame is kept synchronously, receiving side terminal is all sought synchronous points in the larger context, and promptly receiving side terminal keeps being specially synchronously: receiving side terminal is the smart synchronous points of search in each 30 chip of the front and back of a last signal frame synchronous points or bigger scope; And do not need to consider the influence of factors such as co-channel interference this moment.
In the DMO pattern was used, in order to tackle complicated abominable transmission conditions, in the present invention, sending side terminal had been done 1/2 convolutional encoding to the voice and expanded signalling (ECS) part of air frame, also does interleaving treatment after the convolution.By this method that adds channel coding/decoding, improve the ability to bear of the DMO pattern communication of SCDMA system terminal to channel situation complicated and changeable.Certainly, the present invention has more than to be limited to and adopts convolution to add the channel coding/decoding technology that interweaves, and the person of ordinary skill in the field for example can adopt equally that channel coding/decoding such as BCH, RS technology improves the ability to bear of the DMO pattern communication of SCDMA system terminal to channel situation complicated and changeable.
It should be noted that the present invention considers the complexity of realization, in order to reach DMO technology and the unified purpose of existing SCDMA technology, the structure of convolution code of the present invention is identical with the structure of the convolution code that low-speed data service adopted in the existing SCDMA technology, be (2,1,7).The person of ordinary skill in the field should know that it is for unified purpose that the present invention only adopts the structure of above-mentioned convolution code, but the structure of the convolution code among the present invention is not limited in this.
In addition, interleaving treatment of the present invention is specially: sending side terminal is done data interlace one time to front and back two frame signal frames, and the frame data after staggered are carried out intra-frame interleaving again one time.
Below in conjunction with Fig. 5, the concrete application process of SCDMA system terminal of the present invention and terminal direct communication is described as follows.
The application of the DMO pattern of SCDMA system terminal mainly is the state transitions of the MDM of sending side terminal and receiving side terminal.In the application of the DMO of SCDMA system terminal pattern, the MDM state is divided into preparation (Ready), Sleep, RX, TX, Resync and six kinds of states of ScanFreq.To enter the Ready state after the MDM startup finishes, and send out MCU_Ready order and version number, directly transfer to the Sleep state then to MCU.
When MDM was in the Sleep state, it was every 32 frames, and promptly 320ms can be waken up once by MCU.Wherein, MDM determines to enter sleep state by oneself, and it can send an interruption to MCU before the sleep, enter sleep state to notify MCU MDM this moment; MCU has no progeny in receiving this, then will carry out relevant treatment such as timing.The sleep awakening of MDM will be sent by MCU and interrupt waking up.
After MDM is waken up by MCU, communicate by letter with MCU immediately obtaining the order of MCU, and carry out state transitions according to the order of MCU.If this moment, the order of MCU was MDMM_ScanFreqDefault, then MDM changes the ScanFreq state over to; If this moment, the order of MCU was MDMM_Start_TX, then MDM changes the TX state over to; Other, then MDM enters the Resync state.Wherein, the MDM of sending side terminal and receiving side terminal all might change ScanFreq, TX and three kinds of states of Resync according to the order of MCU over to, and ScanFreq, TX and three kinds of states of Resync are carried out respectively at the MDM of sending side terminal or the MDM of receiving side terminal.
1) if the MDM of receiving side terminal transfers to the Resync state, then the MDM of receiving side terminal is synchronous in the frequency search of himself setting, and carries out state transitions according to Search Results.Wherein, if the MDM of receiving side terminal finds synchronously at the frequency of himself setting, and the CRC that searches is correct, and the GID that searches is identical with the GID that himself sets, then the MDM of receiving side terminal to the RX state, and feeds back to Search Results the MCU of receiving side terminal by the Resync state transitions simultaneously; If the MDM of receiving side terminal does not find synchronously at the frequency of himself setting, or the some signal frame CRC of demodulation are all incorrect continuously, or the GID of the GID that searches and himself setting is inequality, then the MDM of receiving side terminal feeds back to the MCU of receiving side terminal with Search Results, and carries out state transitions according to the order of MCU.
2) if the MDM of receiving side terminal transfers to the RX state, then the MDM of receiving side terminal carries out the signal frame that Viterbi deciphers, G.729 tone decoding is handled and while receiving demodulation sending side terminal sends; In addition, the MDM of receiving side terminal judges whether it receives the Link_release signaling packet that sending side terminal sends, and the MCU of receiving side terminal judges whether variation of communication channel quality simultaneously; Wherein,
If the MDM of receiving side terminal receives the Link_release signaling packet, then the MDM of receiving side terminal will stop the receiving demodulation signal frame, and send the MCU_Linkrelease order to described MCU, change the Sleep state afterwards over to; Otherwise the MDM of receiving side terminal continues the signal frame that the receiving demodulation sending side terminal sends;
If the MCU of receiving side terminal judges the communication channel quality variation, and the MDM of receiving side terminal loses synchronously and continuous some signal frame CRC of receiving demodulation are all incorrect, then the MDM of receiving side terminal changes the Resync state over to according to the MDM_Resync order of the MCU transmission of receiving side terminal, and gives for change synchronously by the mode that enlarges the synchronous searching scope; Otherwise the MDM of receiving side terminal continues the signal frame that the receiving demodulation sending side terminal sends; Wherein, do not return synchronously if the continuous several times of the MDM of receiving side terminal are all looked for again synchronously, then the MDM of receiving side terminal changes the Sleep state over to according to the Stop_RX order of the MCU transmission of receiving side terminal.
3) if the MDM of sending side terminal transfers to the TX state, then the MDM of sending side terminal will carry out convolutional encoding, G.729 speech coding is handled, simultaneously will be to aerial emission modulated signal frame; Detect the Stop_TX order of its MCU transmission up to the MDM of sending side terminal after, directly change the Sleep state over to.
4) if the MDM of sending side terminal or receiving side terminal transfers to the ScanFreq state, whether then MDM need carry out frequency sweep and handle according to normal frequency sweep method and flow process in the existing SCDMA technology, have the SCDMA network signal to cover in the hope of in time detecting; After frequency sweep finished, MDM needed to send the MCU_PreSyncResult order to its corresponding M CU, so that the frequency sweep result is fed back to MCU, changes the Sleep state afterwards over to; Wherein,
If described frequency sweep result does not cover for there being the SCDMA network signal, then MDM will carry out state transitions according to the order of MCU; Otherwise described sending side terminal and receiving side terminal will withdraw from the DMO pattern.
Because the DMO pattern is to use under the situation that does not have the SCDMA network signal to cover; so the SCDMA system terminal is waken up from sleep every 32 frames; all will be again from looking for boundary belt to begin to seek synchronously; and judge currently whether have other terminal to transmit with this; therefore just do not need the ortho flow process as existing SCDMA technology, but can be similar with the flow process of deep sleep.
Below in conjunction with Fig. 6, as follows to the sleep process description in the concrete application process of SCDMA system terminal of the present invention and terminal direct communication.Can do following simplification for the sleep flow process under the DMO application model:
1) result after MDM is waken up by MCU according to it judges whether to enter the Sleep state; Wherein, the result after MDM is waken up comprises at least: MDM does not find synchronously at the frequency of himself setting, or the some signal frame CRC of demodulation are all incorrect continuously, or the GID of the GID that searches and himself setting is inequality; MDM receives the Link_release order that described sending side terminal sends; MDM receives Stop_TX order or the Stop_RX order that described MCU sends; MDM finishes frequency sweep and handles (no matter whether sweeping to available frequency);
2) if the result of MDM after being waken up is a kind of in the above-mentioned result, then the data that MDM will communicate by letter with MCU before sleep are saved among the DPRAM, and send interruptions of sleep to MCU, and it will enter sleep state notice MCU; In addition, MDM stops the part hardware resource of its control, behind radio frequency D and D/A converter (AD/DA), codec (CODEC) etc., enters the Sleep state immediately; Otherwise MDM continues to handle accordingly according to the order that MCU sends;
3) MCU is after receiving the interruptions of sleep that MDM sends, calculate himself the length of one's sleep, the initial value of its WaitTimer is set and starts WaitTimer; And MCU enters the Sleep state after the initialization of sleeping;
Wherein, MCU is provided with the initial value of WaitTimer and starts WaitTimer and is specially: preset value AUX0_TIME and AUX1_TIME are set; The automatic step-down of the value of AUX_ON0 and AUX_ON1; Close radio-frequency power supply and radio frequency clock;
In addition, the MCU initialization of sleeping is specially: after each task of MCU enters sleep state, and can be with the sleep event group flag set of its correspondence; Wherein, power saving (PS) task is responsible for detecting the sleep event group, and control MCU enters sleep state after all tasks all are in sleep state;
4) after WaitTimer reduces to preset value AUX0_TIME, WaitTimer starts radio-frequency power supply automatically;
5) after WaitTimer reduces to preset value AUX1_TIME, WaitTimer starts the radio frequency clock automatically;
6) after the WaitTimer timing finishes, WaitTimer sends and interrupts waking up MCU;
7) after MCU is waken up, start the DSP clock, send sleep awakening to MDM subsequently and interrupt, wake MDM up;
8) finish operations such as initialization radio frequency, frequency locking after MDM is waken up, communicate by letter with MCU immediately then obtaining the order of MCU, and carry out state transitions according to the order that MCU sends.
Should be pointed out that to it will be apparent to those skilled in the art that and under the prerequisite that does not break away from the principle of the invention, can also make some improvements and modifications that these improvements and modifications also should be considered as protection scope of the present invention.
Claims (12)
1. method that realizes SCDMA system terminal and terminal direct communication, this SCDMA system terminal comprises sending side terminal and receiving side terminal at least, it is characterized in that, comprising:
Step 1: sending side terminal carries the signal frame of synchronizing symbol and cluster group character according to its physical layer frame structure emission;
Step 2: a plurality of receiving side terminals of same cluster group character look for the processing of relevant peaks and synchronous points and described sending side terminal to set up synchronously after looking for boundary belt earlier;
Step 3: described receiving side terminal after setting up synchronously with described sending side terminal, the described signal frame of receiving demodulation and keeping synchronously simultaneously;
Wherein, described physical layer frame structure comprises tactic successively from front to back:
Synchronizing symbol takies 4 symbols, and content is 1 entirely, is used to make described receiving side terminal to obtain to receive synchronously, carrier wave recovers and the time proofreaies and correct;
Reference symbol takies 1 symbol, and content is a binary digit 10, is used as the reference symbol that described receiving side terminal is separated timing;
Number of frames takies 3 symbols, and value is 0～63;
The cluster group character takies 8 symbols, and content-length is 2 bytes;
Distinguished symbol takies 1 symbol, is used to discern the information content that described signal frame loads, and wherein 00,01,10 and 11 represent that successively described signal frame is voice signal or short message information, empty frame, control signal and stick signal;
The cyclic redundancy check (CRC) position takies 3 symbols, is used for number of frames, cluster group character and distinguished symbol that described receiving side terminal receives are carried out cyclic redundancy check (CRC);
Modulated voice signal or short message information take 96 symbols;
Protected field takies 12 symbols, and described sending side terminal is not launched this protected field when the described signal frame of emission.
2. method according to claim 1 is characterized in that, also comprises: described sending side terminal is set a Walsh sequence according to user's request.
3. method according to claim 2 is characterized in that, described sending side terminal uses the Walsh sequence of described setting that all the elements in the described physical layer frame structure are modulated.
4. method according to claim 2 is characterized in that, described receiving side terminal uses the Walsh sequence of described setting that its signal frame that receives is carried out demodulation.
5. method according to claim 3, it is characterized in that, described sending side terminal at first carries out 1/2 convolution to the modulated voice signal in the described physical layer frame structure or short message information and adds the processing that interweaves, and the Walsh sequence that re-uses described setting is modulated all the elements in the described physical layer frame structure.
6. method according to claim 1 is characterized in that, in described step 2, described receiving side terminal is looked for boundary belt according to following steps, promptly carries out synchronously thick:
1) receiving side terminal receives 130 symbols of sending side terminal emission, and these 130 symbols is removed to ask behind the direct current energy of each symbol;
2) receiving side terminal is done the maximum rising edge of asking energy after the smoothing processing to the energy of described each symbol, and the original position that should the maximum rising edge transmits as sending side terminal;
3) receiving side terminal receives the time of beginning according to described original position adjustment.
7. method according to claim 1 is characterized in that, in described step 3, described receiving side terminal keeps synchronously according to following steps:
Receiving side terminal is the smart synchronous points of search in the scope of each 30 chip at least in the front and back of a last signal frame synchronous points.
8. system that realizes SCDMA system terminal and terminal direct communication, this SCDMA system terminal comprises sending side terminal and receiving side terminal at least, and this receiving side terminal comprises modulator-demodulator and main control unit at least, it is characterized in that, comprising:
Step 1: described modulator-demodulator is transferred to synchronous regime again by sleep state after 320ms is waken up by described main control unit;
Step 2: described modulator-demodulator search is synchronous, and carries out state transitions according to Search Results; Wherein,
If described modulator-demodulator finds synchronously at the frequency of himself setting, and the cyclic redundancy check (CRC) position that searches is correct, and the cluster group character that searches is identical with the cluster group character of himself setting, then described modulator-demodulator is transferred to accepting state by synchronous regime again, and Search Results is fed back to described main control unit simultaneously;
If described modulator-demodulator does not find synchronously at the frequency of himself setting, or the some signal frame cyclic redundancy check (CRC) of demodulation position is all incorrect continuously, or the cluster group character of the cluster group character that searches and himself setting is inequality, then described modulator-demodulator feeds back to described main control unit with Search Results, and carries out state transitions according to the order of described main control unit.
9. system according to claim 8 is characterized in that, after described modulator-demodulator is transferred to accepting state, comprising:
1) signal frame of the described sending side terminal transmission of described modulator-demodulator receiving demodulation;
2) described modulator-demodulator judges whether it receives the link release command that described sending side terminal sends, and described main control unit is judged whether variation of communication channel quality simultaneously; Wherein,
If described modulator-demodulator receives described link release command, then modulator-demodulator will stop the receiving demodulation signal frame, and send described link release command to described main control unit, change sleep state afterwards over to; Otherwise described modulator-demodulator continues the signal frame that the receiving demodulation sending side terminal sends;
If described main control unit is judged the communication channel quality variation, and described modulator-demodulator is lost synchronously and continuous some signal frame cyclic redundancy check (CRC) position of receiving demodulation is all incorrect, then described modulator-demodulator changes synchronous regime again over to according to the synch command again that described main control unit sends, and gives for change synchronously by the mode that enlarges the synchronous searching scope; Otherwise described modulator-demodulator continues the signal frame that the receiving demodulation sending side terminal sends; Wherein,
Do not return synchronously if the continuous several times of described modulator-demodulator are all looked for again synchronously, then described modulator-demodulator changes sleep state over to according to the reception order that stops that described main control unit sends.
10. system that realizes SCDMA system terminal and terminal direct communication, this SCDMA system terminal comprises modulator-demodulator and main control unit at least, it is characterized in that, comprising:
Step 1: described modulator-demodulator is transferred to the frequency sweep state by sleep state after being waken up by described main control unit; Wherein, described modulator-demodulator time interval of transferring to the frequency sweep state by sleep state is a few minutes;
Step 2: described modulator-demodulator carries out frequency sweep to be handled, and the frequency sweep result is fed back to described main control unit, changes sleep state afterwards over to; Wherein,
If described frequency sweep result does not cover for there being the SCDMA network signal, then described modulator-demodulator will carry out state transitions according to the order of described main control unit; Otherwise sending side terminal and receiving side terminal will withdraw from the pattern of described terminal and terminal direct communication.
11. according to Claim 8 or 10 described systems, it is characterized in that, be in dormant modulator-demodulator and waken up once by described main control unit every 320ms.
12. according to Claim 8 or 10 described systems, it is characterized in that described modulator-demodulator enters and withdraws from sleep state and mainly comprises:
1) result after described modulator-demodulator is waken up by described main control unit according to it judges whether to enter sleep state; Wherein,
Result after described modulator-demodulator is waken up comprises at least: modulator-demodulator does not find synchronously at the frequency of himself setting, or the some signal frame cyclic redundancy check (CRC) of demodulation position is all incorrect continuously, or the cluster group character of the cluster group character that searches and himself setting is inequality; Modulator-demodulator receives the link release command that described sending side terminal sends; Modulator-demodulator receives stopping the transmission order or stopping to receive order of described main control unit transmission; Modulator-demodulator is finished frequency sweep and is handled;
If the result of described modulator-demodulator after being waken up is a kind of in the above-mentioned result, then described modulator-demodulator sends interruptions of sleep to described main control unit, goes forward side by side into the sleep state; Otherwise described modulator-demodulator continues to handle accordingly according to the order that described main control unit sends;
2) described main control unit is after receiving described interruptions of sleep, calculate himself the length of one's sleep, the initial value of its sleep timer is set and starts described sleep timer; And described main control unit is gone into the sleep state in that the initialization of sleeping is laggard;
3) after described sleep timer timing finishes, wake described main control unit up;
4) described main control unit sends the sleep awakening interruption to described modulator-demodulator and wakes modulator-demodulator up;
5) described modulator-demodulator is communicated by letter with described main control unit, and carries out state transitions according to the order that described main control unit sends.
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| US20210105124A1 (en) * | 2017-06-29 | 2021-04-08 | Qualcomm Incorporated | Providing protection for information delivered in demodulation reference signals (dmrs) |
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| CN101662733B (en) * | 2009-09-29 | 2013-03-27 | 中兴通讯股份有限公司 | Method of applying offline direct mode operation (DMO) and device thereof |
| CN102958097B (en) * | 2011-08-23 | 2016-08-03 | 华为技术有限公司 | Realize synchronizing between subscriber equipment and the method and apparatus of perception |
| CN103220782B (en) * | 2012-01-19 | 2017-08-18 | 华为技术有限公司 | A kind of determination method, system and equipment for transmitting subframe |
| CN103945421A (en) * | 2013-01-18 | 2014-07-23 | 中国普天信息产业股份有限公司 | Method for identifying broadband trunking direct mode operation call |
| CN106550317B (en) * | 2015-09-21 | 2019-11-15 | 海能达通信股份有限公司 | Individual calling method, device and system under a kind of broadband DMO |
| CN105635857B (en) * | 2015-12-21 | 2019-01-04 | 北京众谱达科技有限公司 | DMR digital walkie-talkie is chipped in system in real time |
| CN106302731A (en) * | 2016-08-16 | 2017-01-04 | 柳州市旭邦科技有限公司 | A kind of without data cloud method for pushing under network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20210105124A1 (en) * | 2017-06-29 | 2021-04-08 | Qualcomm Incorporated | Providing protection for information delivered in demodulation reference signals (dmrs) |
| US11671222B2 (en) * | 2017-06-29 | 2023-06-06 | Qualcomm Incorporated | Providing protection for information delivered in demodulation reference signals (DMRS) |
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Assignee: SHENZHEN XINWEI TELECOMM TECHNOLOGY CO., LTD. Assignor: Xinwei Communications Technological Co., Ltd., Beijing Contract record no.: 2011110000200 Denomination of invention: Method of implementing SCDMA system terminal-to-terminal direct communication and uses thereof Granted publication date: 20100217 License type: Exclusive License Open date: 20080416 Record date: 20111226 |
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