CN1913394B - Synchronous control method for trunking communication system - Google Patents
Synchronous control method for trunking communication system Download PDFInfo
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- CN1913394B CN1913394B CN 200510089993 CN200510089993A CN1913394B CN 1913394 B CN1913394 B CN 1913394B CN 200510089993 CN200510089993 CN 200510089993 CN 200510089993 A CN200510089993 A CN 200510089993A CN 1913394 B CN1913394 B CN 1913394B
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Abstract
This invention relates to a control method for synchronization of the cluster communication system including multicast and multi-call services, in which, the multicast includes: A, a terminal gets the synchronization adjustment information fed back by a base station to regulate premises time volume of the up-line synchronization based on said information, B, the base station measures the arriving time of the PTT up-line shared physical signals with the speaking right terminal and compares with the desired arriving time to determine the up-line synchronization control order words to be sent to the terminal by the PTT down shared physical channel, C, the terminal controls the sending time of the PTT up-line shared physical signals based on the words got. Said multi-call realizes control to the PTT up-line shared physical channel or PYY signaling channel by judging if the terminal has got the use of the PTT shared physical channel and if it can get the PTT signaling channel.
Description
Technical field
The present invention relates to communication technical field, particularly relate to the synchronisation control means in a kind of trunked communication system.
Background technology
Along with the development of society, people are urgent day by day to the demand of communication, and are also more and more higher to the quality requirement of communication.Therefore, the application of mobile communication is also in continuous expansion, and type is also more and more, such as the TD-SCDMA trunked communication system.Described TD-SCDMA trunking communication is an a kind of multi-user shared group communication channel and not interactive technology.The basic principle of TD-SCDMA trunking communication is: by each channel in central controller centralized control and the management system, and with dynamical fashion idle channel is distributed to the user who makes a call, again this channel is regained to the user who waits for after conversation is finished and used.
Common TD-SCDMA trunked communication system is a kind of special mobile radio system or specialized mobile radio system, mainly is that the mobile subscriber for the specialized company of outdoor study and business department provides communication services such as production scheduling and commander's control.Be easy to use, set up the advantages such as quick and good confidentiality of conversing because it has, thereby be widely used.
In the TD-SCDMA trunked communication system, the distinctive business of group system such as group calling and multicast have been introduced.
Described group calling is to form a group by some users, and the physical channel that group-calling service need be set up has: the up shared physical channel of PTT; The PTT Physical Downlink Shared Channel; And PTT signaling channel.In group-calling service, network can distribute independent PTT signaling channel for each user in organizing, and described PTT signaling channel can be the continuous dispensing mode or the discontinuous method of salary distribution.When distributing the PTT signaling channel, distribute up signaling channel of PTT and PTT downlink signaling channel simultaneously for the user.
In group-calling service, the user in group need obtain speaking right by preemption processes, obtains the up shared physical channel of CU PTT of speaking right; Do not obtain the user of speaking right, can not use the up shared physical channel of PTT, can only receive the PTT Physical Downlink Shared Channel; In addition, each user can have independent PTT signaling channel in the group.
Wherein, the described only just existence in group-calling service of process that obtains speaking right by the mode of seizing, but whether according to network is that the user distributes the PTT signaling channel, implementation is different, for example, if network distributes the PTT signaling channel for the user, when the user need talk, by the up signaling channel of PTT, the application speaking right, network is after receiving this request, whether in this group have other it user talk, if there are not other users to talk, then network is authorized this user's speaking right (if when being applied for simultaneously by a plurality of users if judging earlier, network based priority is with the highest user of speaking right grant priority), and obtain speaking right by this user of PTT downlink signaling channel notification; If network can't be authorized user's speaking right (such as there being other users to converse, the higher customer requirements speech of priority being arranged perhaps), then network is by the talk request of PTT downlink signaling channel refusing user's.
If network is not for the user distributes the PTT signaling channel, when the user need talk, preemption processes need use Random Access Channel RACH, forward access channel FACH to carry out.The user applies for speaking right by the RACH channel.Network obtains request, after judging, authorize this user (its deterministic process is consistent with the situation that the PTT signaling channel is arranged) with speaking right, notify the user by FACH, this user reads the FACH channel, the speaking right that obtains network is authorized situation, if speaking right is authorized this user, then seize success, the user obtains speaking right and begins speech, if speaking right is authorized other users, seize failure.
In multicast service, described multicast also is to form a group by some users, and the physical channel that needs to set up has up shared physical channel of PTT and PTT Physical Downlink Shared Channel.Its user does not need to seize speaking right in the process of communication, but other just obtains speaking right by the owner priority level, and the user with speaking right just takies the PTT uplink physical channel.In multicast service, a user in group has speaking right, takies the up shared physical channel of PTT; All the other users do not have speaking right, can not use the up shared physical channel of PTT, can only receive the PTT Physical Downlink Shared Channel.
From the above, the PTT business belongs to a kind of business of new introducing for the trunking communication of TD-SCDMA, has newly introduced above-mentioned several newly-increased PTT channel for this reason.At present, at these newly-increased PTT channels, also do not have the Synchronization Control scheme, promptly the Synchronization Control problem at the physical layer of new business does not also solve, to such an extent as to receiving position that can accurately the control terminal signal, thus the receptivity of terminal reduced.In addition, owing to also do not have the Synchronization Control scheme for newly-increased PTT channel in the prior art, the serious interference will appear in the transmitting-receiving time slot appearance intersection when adjacent base station.
Summary of the invention
The technical problem that the present invention solves provides the synchronisation control means in a kind of trunked communication system, to introduce the physical layer synchronization control problem under group calling, the multicast scenarios in the trunking communication that solves TD-SCDMA.
For addressing the above problem, the invention provides the synchronisation control means of multicast service in a kind of trunked communication system, comprise step:
A, terminal are obtained the synchronous adjustment information of base station feedback, and adjust the Timing Advance of uplink synchronous according to this synchronous adjustment information; Specifically comprise: A1) terminal obtains initial synchronisation according to the signal that the base station issues, and the transmitting time of definite uplink pilot signal; A2) terminal sends uplink pilot signal according to the transmitting time of described uplink pilot signal to the base station; A3) transmitting time of base station measurement uplink pilot signal, obtain the time of reception of uplink pilot signal, and calculate the time of reception of described uplink pilot signal and the time-delay deviation that the time of reception of uplink pilot signal is expected in the base station, and with this time-delay deviation notice terminal; A4) terminal realizes uplink synchronous according to the transmitting time of described time-delay deviation adjustment uplink pilot signal;
B, base station measurement have the time of advent of speaking right user's the up shared physical signalling of PTT, and with the expectation the time of advent compare, determine uplink synchronous control command word according to comparative result, and described uplink synchronous control command word is sent to terminal by the PTT Physical Downlink Shared Channel;
C, terminal are controlled the transmitting time of the up shared physical signalling of PTT according to the uplink synchronous control command word that obtains.
Steps A 3) formula that calculates time-delay deviation in is:
UpPCH
POS＝UpPTS
Rxpath-UpPTS
TS
Wherein, described UpPTS
RxpathBe that the base station receives the synchronous uplink pilot signal time of initial uplink; Described UpPTS
TSIt is the time that the base station expectation receives uplink pilot signal; Described UpPCH
POSBeing time-delay deviation, is the poor of the terminal that receives standard UpPCH time of sending UpPCH time and base station;
Steps A 4) formula that terminal is adjusted the transmitting time of uplink pilot signal according to time-delay deviation in is:
UpPCH
NEWAVD＝UpPCH
OLDAVD+UpPCH
POS-8*16T
C
Wherein, described UpPCH
OLDAVDBe that terminal realizes the initial uplink transmitting time of down definite UpPCH synchronously; Described UpPCH
POSBeing time-delay deviation, is the poor of the terminal that receives standard UpPCH time of sending UpPCH time and base station; Described UpPCH
NEWAVDIt is the transmitting time that terminal realizes determining under the accurate uplink synchronous UpPCH; Described T
CBeing chip period, is the inverse of spreading rate.
The content of described synchronous control command word comprises: determine the transmitting time of transmitting time that terminal shifts to an earlier date, hysteresis or keep existing transmitting time.
Terminal is carried out corresponding control according to the content in the described uplink synchronous control command word to uplink synchronous channel.
In addition, the present invention also provides the synchronisation control means of group-calling service in a kind of trunked communication system, and described method comprises step:
A, judge whether the user obtains the right to use of up shared physical channel, if, execution in step B, otherwise, execution in step C;
B, judge whether terminal is assigned to the PTT signaling channel, if, terminal realizes the transmitting time of the up signaling-information of the PTT transmitting time as the up shared physical signalling of PTT up shared physical channel of PTT and the up signaling channel of PTT are carried out identical uplink synchronous control; Specifically comprise: E1) terminal is with the transmitting time of the up signaling-information of the PTT transmitting time as the up shared physical signalling of PTT; E2) time of reception of the up shared physical signalling of base station measurement PTT, and with the expectation time of reception compare, determine uplink synchronous control command word according to comparative result, and described uplink synchronous control command word is sent to terminal by the PTT Physical Downlink Shared Channel; E3) terminal is carried out identical control to the up shared physical channel of PTT with the up signaling channel of PTT according to the described upload control command word that obtains; Otherwise terminal realizes the uplink synchronous control to the up shared physical channel of PTT by sending the Timing Advance that uplink pilot signal obtains uplink synchronous; Specifically comprise: F1) terminal is obtained the synchronous adjustment information of base station feedback, and adjusts the Timing Advance of uplink synchronous according to this synchronous adjustment information; F2) time of reception of the up shared physical signalling of base station measurement PTT, and with the expectation time of reception compare, determine uplink synchronous control command word according to comparative result, send to terminal by the PTT Physical Downlink Shared Channel; F3) terminal is controlled the transmitting time of the up shared physical signalling of PTT according to uplink synchronous control command word;
If the C terminal only is assigned to the PTT signaling channel, time of advent of base station measurement PTT signaling-information then, and determine uplink synchronous control command word according to measurement result, the PTT signaling channel is carried out corresponding uplink synchronous control; Specifically comprise: H1) time of advent of the up signaling-information of base station measurement PTT, and compare determine uplink synchronous control command word, send to terminal by PTT downlink signaling channel according to relatively result with time of advent of expectation; H2) terminal is controlled the transmitting time of the up signaling-information of PTT according to uplink synchronous control command word.
Described step F 1) implementation procedure is specially:
G1) terminal obtains initial synchronisation according to the signal that the base station issues, and the transmitting time of definite uplink pilot signal;
G2) terminal sends uplink pilot signal according to the transmitting time of determining uplink pilot signal to the base station;
G3) transmitting time of base station measurement uplink pilot signal, obtain the time of reception of uplink pilot signal, and calculate the time of reception of described uplink pilot signal and the time-delay deviation that the time that uplink pilot signal receives is expected in the base station, and with this time-delay deviation notice terminal;
G4) terminal realizes uplink synchronous according to the transmitting time of described time-delay deviation adjustment uplink pilot signal.
Step G3) formula that calculates time-delay deviation in is:
UpPCH
POS＝UpPTS
Rxpath-UpPTS
TS
Wherein, described UpPTS
RxpathBe that the base station receives the synchronous uplink pilot signal time of initial uplink; Described UpPTS
TSIt is the time that the base station expectation receives uplink pilot signal; Described UpPCH
POSBeing time-delay deviation, is the poor of the terminal that receives standard UpPCH time of sending UpPCH time and base station;
Step G4) formula that terminal is adjusted the transmitting time of uplink pilot signal according to described time-delay deviation in is:
UpPCH
NEWAVD＝UpPCH
OLDAVD+UpPCH
POS-8*16T
C
Wherein, described UpPCH
OLDAVDIt is the transmitting time that terminal realizes the UpPCH that initial uplink is determined down synchronously; Described UpPCH
POSBeing time-delay deviation, is the poor of the terminal that receives standard UpPCH time of sending UpPCH time and base station; Described UpPCH
NEWAVDIt is the transmitting time that terminal realizes determining under the accurate uplink synchronous UpPCH; Described T
CBeing chip period, is the inverse of spreading rate.
In addition, the present invention provides the synchronisation control means of group-calling service in a kind of trunked communication system again, and described method comprises step:
If the A terminal only obtains the right to use of the up shared physical channel of PTT, then terminal is obtained the synchronous adjustment information of base station feedback, and adjusts the Timing Advance of uplink synchronous according to this synchronous adjustment information; Specifically comprise: A1) terminal obtains initial synchronisation according to the signal that the base station issues, and the transmitting time of definite uplink pilot signal; A2) terminal sends uplink pilot signal according to the transmitting time of described uplink pilot signal to the base station; A3) transmitting time of base station measurement uplink pilot signal, obtain the time of reception of uplink pilot signal, and calculate the time of reception of described uplink pilot signal and the time-delay deviation that the time of reception of uplink pilot signal is expected in the base station, and notify described terminal with this time-delay deviation; A4) terminal realizes uplink synchronous according to the transmitting time of described time-delay deviation adjustment uplink pilot signal;
B, base station measurement have the time of advent of the up shared physical signalling of PTT of speaking right terminal, and with the expectation the time of advent compare, determine uplink synchronous control command word according to comparative result, and described uplink synchronous control command word is sent to terminal by the PTT Physical Downlink Shared Channel;
C, terminal are controlled the transmitting time of the up shared physical signalling of PTT according to the uplink synchronous control command word that obtains.
The implementation procedure of described steps A is specially:
A1) terminal obtains initial synchronisation according to the signal that the base station issues, and the transmitting time of definite uplink pilot signal;
A2) terminal sends uplink pilot signal according to the transmitting time of described uplink pilot signal to the base station;
A3) transmitting time of base station measurement uplink pilot signal, obtain the time of reception of uplink pilot signal, and calculate the time of reception of described uplink pilot signal and the time-delay deviation that the time of reception of uplink pilot signal is expected in the base station, and notify described terminal with this time-delay deviation;
A4) terminal realizes uplink synchronous according to the transmitting time of described time-delay deviation adjustment uplink pilot signal.
Steps A 3) formula that calculates time-delay deviation in is:
UpPCH
POS＝UpPTS
Rxpath-UpPTS
TS
Wherein, described UpPTS
RxpathBe that the base station receives the synchronous uplink pilot signal time of initial uplink; Described UpPTS
TSIt is the time that the base station expectation receives uplink pilot signal;
Steps A 4) terminal according to the formula of the transmitting time of time-delay deviation modulation uplink pilot signal is in:
UpPCH
NEWAVD＝UpPCH
OLDAVD+UpPCH
POS-8*16T
C
Wherein, described UpPCH
OLDAVDIt is the transmitting time that terminal realizes the UpPCH that initial uplink is determined down synchronously; Described UpPCH
POSBe the poor of the terminal that receives standard UpPCH time of sending UpPCH time and base station; Described UpPCH
NEWAVDIt is the transmitting time that terminal realizes determining under the accurate uplink synchronous UpPCH.
The present invention provides the synchronisation control means of group-calling service in a kind of trunked communication system again, and described method comprises step:
If the A terminal obtains the right to use of the up shared physical channel of PTT, and obtain the PTT signaling channel of network allocation, terminal is with the transmitting time of the up signaling-information of the PTT transmitting time as the up shared physical signalling of PTT;
The time of reception of the up shared physical signalling of PTT is passed through to measure in B, base station, and compares with the time of reception of expecting, determines uplink synchronous control command word according to comparative result; And described uplink synchronous control command word is sent to terminal by the PTT Physical Downlink Shared Channel;
C, terminal are carried out identical control to the up shared physical channel of PTT with the up signaling channel of PTT according to the described uplink synchronous control command word that obtains.
Compared with prior art, the present invention has following beneficial effect: the PTT channel that the present invention is directed to increase has proposed synchronisation control means, particularly to the Synchronization Control of channel uplink.This up Synchronization Control comprises two processes: the process of setting up of uplink synchronous and maintenance process.But, in the control procedure of carrying out uplink synchronous, the process of setting up of initial uplink synchronous is necessary, be exactly that terminal is by sending the time of reception of UpPTS data, base station measurement terminal transmission UpPTS data, compare by time of reception with expectation, obtain the time-delay deviation of the two, and this time-delay deviation feeds back to terminal by FPACH, terminal is adjusted the time that sends data accordingly according to the time-delay deviation that obtains, terminal obtains initial uplink synchronous, this shows that it is necessary obtaining initial uplink synchronous process, otherwise system can't work.Then, on the synchronous basis of initial uplink, carry out the process that uplink synchronous keeps, the maintenance of described uplink synchronous can be according to the time of advent of up signaling-information of PTT or up shared physical signalling, and the time of advent of its measurement and the time of advent of expectation compared, and the result that will compare determines uplink synchronous control command word (comprising), and give terminal by corresponding channel feedback with this uplink synchronous command word, terminal is adjusted the transmitting time of signal accordingly according to the uplink synchronous control command word that receives, to realize the maintenance of uplink synchronous.Described synchronous control command word is a kind of function of enhancing property, and the base station is the receiving position of control terminal signal accurately, improves receptivity.
Description of drawings
Fig. 1 is the flow chart of the synchronisation control means of multicast service in the trunked communication system of the present invention;
Fig. 2 is the flow chart of the synchronisation control means of group-calling service in the trunked communication system of the present invention;
Fig. 3 is the flow chart of the synchronisation control means of group-calling service in another trunked communication system of the present invention;
Fig. 4 is the flow chart of the synchronisation control means of group-calling service in another trunked communication system of the present invention.
Embodiment
Core of the present invention is at Time Division-Synchronous Code Division Multiple Access (TD-SCDMA, during Time-DivisionSynchronization Code Division-Multiple-Access) as trunking communication, with respect to traditional cellular communication system, and the new multicast and the business demand of group calling have been introduced, the different synchronous control mode that the present invention adopts carries out Synchronization Control to the new physical layer of introducing business, with the receiving position of control terminal signal accurately, thereby reduce the receptivity of terminal.The Synchronization Control of described TD-SCDMA group system can be divided into uplink synchronous control and down-going synchronous control.Need to prove, because the cdma system downstream signal itself is exactly synchronous, so the downstream signal of TD-SCDMA group system also is synchronous, described down-going synchronous control is meant that terminal and base station keep synchronously with the signal that send the base station in other words, and down-going synchronous is the prerequisite and the basis of uplink synchronous.In group system of the present invention, down-going synchronous control is as broad as long with traditional TD-SCDMA mobile communication system, all be to finish by downlink pilot frequency channel DwPCH and Traffic Channel or Primary Common Control Physical Channel (P-CCPCH, Primary CommonControl Physical Channel) channel.Therefore, the present invention only relates to uplink synchronous control.And uplink synchronous control generally comprises two processes, promptly up process and the up maintenance process set up.
Below in conjunction with accompanying drawing the present invention is done the present invention is described further.But, need explanation to be: in fact the up shared physical signalling of transmission PTT of the present invention, the up signaling-information of PTT and PTT signaling-information etc. are respectively: send signal, the signal of the up signaling channel of PTT and the signal of PTT signaling channel etc. of the up shared physical channel of PTT, no longer repeat in the following description.
Please refer to Fig. 1, be the flow chart of the synchronisation control means of multicast service in the trunked communication system of the present invention; Described method comprises step:
Step R10: terminal is obtained the synchronous adjustment information of base station feedback, and adjusts the transmitting time of uplink synchronous according to this synchronous adjustment information, finishes uplink synchronous;
Step R11: base station measurement has the PTT PoC (PTT of speaking right terminal, push-to-talk) time of advent of up shared physical signalling, and with its with the expectation time of advent compare, and comparative result determined uplink synchronous control command word, send to terminal by the PTT Physical Downlink Shared Channel;
Step R12: terminal is controlled the transmitting time of the up shared physical signalling of PTT according to the uplink synchronous control command word that obtains.
Uplink synchronous control of the present invention further comprises: the foundation of uplink synchronous and the maintenance of uplink synchronous.The process of setting up of described uplink synchronous is compared as broad as long with traditional TD-SCDMA mobile communication system, each user in the group is by emission ascending pilot channel UpPCH, the base station feeds back to terminal by physical access channel FPACH with synchronous adjustment information, terminal is finished accurate uplink synchronous according to the Timing Advance of the feedback adjusting information adjustment uplink synchronous of base station.That is to say, each user initiates request by ascending pilot channel in the terminal multicast, when the base station monitors when request at ascending pilot channel, the time-delay deviation of assessment terminal, obtain the initial uplink signal sending time that uplink synchronous is set up according to described deviation result, and should the time begin to send data as the transmitting time of the up shared physical signalling of PTT.Its concrete implementation procedure comprises:
A1, terminal receive base station transmit signals, and according to received signal, obtain frame synchronization (because propagation delay time, the frame head position of terminal and the frame head position of base station have deviation), and promptly obtaining rough uplink synchronous (is UpPCH
OLDAVD), determine the transmitting time of ascending pilot channel UpPCH;
A2, terminal send the UpPCH data according to determining the UpPCH transmitting time;
The UpPCH data that a3, base station measurement terminal send, obtain the UpPCH time of reception, the UpPCH time of reception of this time of reception and base station is variant, promptly have time-delay deviation in time between second, the standard that the UpPCH time that the terminal that described time-delay deviation equals to receive sends deducts the base station receives the UpPCH time;
A4, base station are notified terminal by rapid physical receive channel FPACH with time-delay deviation;
After a5, terminal obtain time-delay deviation,, adjust the time that terminal sends uplink pilot signal, finish accurate uplink synchronous according to time-delay deviation.
The concrete of time-delay deviation of the present invention is defined as: Received SYNC-UL TimingDeviation ' is the time difference, and the formula of its calculation delay deviation is:
UpPCH
POS＝UpPTS
Rxpath-UpPTS
TS
Wherein, described UpPTS
RxpathBe that the base station receives the synchronous uplink pilot signal time (time of the reception in the Node B of the SYNC-UL to be used in the uplinksynchronization process) of initial uplink; Described UpPTS
TSIt is the time (time instance two symbols prior to the end of the DwPCH according to theNode B internal timing) that the base station expectation receives uplink pilot signal.
And terminal obtains time-delay deviation UpPCH
POSAfter, according to described time-delay deviation, pass through formula:
UpPCH
NEWAVD＝UpPCH
OLDAVD+UpPCH
POS-8*16T
C
Adjust the transmitting time that terminal sends uplink pilot signal, finish accurate uplink synchronous.Wherein, described UpPCH
OLDAVDBe exactly the transmitting time that terminal realizes UpPCH definite under the rough uplink synchronous, UpPCH
NEWAVDIt is the transmitting time that terminal realizes UpPCH definite under the accurate uplink synchronous.But why the present invention also will be by deducting 8*16T in above-mentioned formula
CAdjust the time that terminal sends uplink pilot signal, this is because in actual applications, the standard of base station receives the UpPTS of UpPCH time ratio definition
TS8 symbol that lagged behind (equal 8*16T on the time
C), the standard of base station receives UpPCH time=UpPTS
TS+ 8*16T
CSo, UpPCH
POSBe not that real time-delay deviation (but has differed from 8*16T
C), therefore, the formula that terminal is accurately adjusted the transmitting time of uplink pilot signal is UpPCH
NEWAVD=UpPCH
OLDAVD+ UpPCH
POS-8*16T
C
But why not the present invention directly defines the base station standard and receives the UpPCH time, and this is because in present standard criterion, and base station standard time of reception has been had UpPTS
TSDefinition, for do not occur the conflict, the present invention does not introduce new definition again, but explains with original definition.Simple, described UpPTS
TSBe in advance in the time point of two symbol of DwPCH end point, just in advance in the time point (the UpPTS time of reception of standard lags behind 6 symbol of DwPCH end point) of 8 symbol of the UpPTS of standard time of reception.
The present invention begins to carry out the maintenance of uplink synchronous after finishing accurate uplink synchronous (being that uplink synchronous is set up).In multicast, owing to have only a user to have speaking right (describe for convenient, claim that this user is user A), therefore, have only user A to take the up shared physical channel of PTT, also have only user A to need uplink synchronous control.The transmitting time of the up shared physical channel of base station measurement PTT, measurement result according to the up shared physical channel of PTT, and this measurement result and the time that wish to arrive compared, and according to comparative result generation uplink synchronous control command word, be transmitted to user A by the PTT Physical Downlink Shared Channel, user A obtains uplink synchronous control command word by demodulation PTT Physical Downlink Shared Channel, and ascending pilot channel is carried out corresponding uplink synchronous adjustment.All the other users receive only the PTT Physical Downlink Shared Channel, and abandon synchronous control command word wherein.Wherein, realize being specially of uplink synchronous maintenance:
B1: the time of advent of the up shared physical signalling of base station measurement PTT; Its concrete method of measurement mainly is: the base station is detected receiving data, can obtain the time of advent of received signal.Wherein, the detection method of described reception data, be meant and utilize the given data that receives data, the recipient carries out matched filtering with given data to receiving data, and to maximizing among the result of matched filtering, the time of reception point of maximum correspondence is exactly the time of advent of the up shared physical signalling of PTT, this method for a person skilled in the art, be disclosed technology contents, to this, the present invention does not remake detailed explanation.
B2: the base station is according to the time of advent of measuring, compare with the time of advent of expectation, determine uplink synchronous control command word, determine promptly to wish that terminal shifts to an earlier date or the transmission data that lag behind according to comparative result, or keep existing transmitting time, produce the synchronous control command word thus;
B3: the base station is by PTT Physical Downlink Shared Channel transmitting control commands word;
B4: after terminal obtains the control command word,, just keep transmitting time constant if the base station requires to keep; If the base station requires to lag behind and sends, fixing step-length (as 1/8chip, this is measured by network configuration) lags behind on existing transmitting time; If the base station requires to send in advance, shift to an earlier date the fixing step-length (as 1/8chip, this is measured by network configuration) in back in existing transmitting time.
In addition, the present invention also provides the synchronisation control means of group-calling service in a kind of trunked communication system, and the flow chart of described method sees Fig. 2 for details, and described method comprises step:
Step S10: judge whether terminal obtains the right to use of the up shared physical channel of PTT, if, execution in step S12, otherwise, execution in step S11;
Step S11: time of advent of base station measurement PTT signaling-information then, and determine uplink synchronous control command word according to measurement result, and the PTT signaling channel is carried out corresponding uplink synchronous control, finish;
Step S12: judge whether terminal is assigned to the PTT signaling channel, if be assigned to, execution in step S13 then; Otherwise, execution in step S14;
Step S13: terminal realizes the transmitting time of the up signaling-information of the PTT transmitting time as the up shared physical signalling of PTT up shared physical channel of PTT and the up signaling channel of PTT are carried out identical uplink synchronous control;
Step S14: when terminal was had to the right to use of the up shared physical signalling of PTT, the user realized the uplink synchronous control to the up shared physical channel of PTT by sending the Timing Advance that ascending pilot channel obtains uplink synchronous.
The uplink synchronous control of described group-calling service also comprises two processes, and promptly uplink synchronous is set up process and uplink synchronous maintenance process.It is identical with the implementation procedure of multicast service that described group-calling service uplink synchronous is set up process, specifically sees the implementation procedure of the uplink synchronous foundation of above-mentioned multicast service for details, here do not giving unnecessary details.And the control procedure of uplink synchronous and multicast service is inequality.Because in group-calling service, the user need be by seizing the up shared physical channel of PTT, and just can use the up shared physical channel of PTT after the network approval.And whether use the user of the up shared physical channel of PTT according to the user, uplink synchronous control is different.
First kind is: when terminal does not obtain the right to use of the up shared physical channel of PTT, if network has been terminal configuration PTT signaling channel then need carry out uplink synchronous control for the PTT signaling channel; If network does not dispose the PTT signaling channel for the user, then terminal just receives descending channel information, need not carry out the uplink synchronous control procedure.Therefore, when terminal did not obtain the right to use of the up shared physical channel of PTT, if network has been terminal configuration PTT signaling channel, then the implementation procedure of uplink synchronous was:
C1: the time of advent of the up signaling-information of base station measurement PTT; Its concrete method of measurement mainly is: the base station is detected receiving data, can obtain the time of advent of received signal.Wherein, for the detection method (ditto described) that receives data, for a person skilled in the art, be disclosed technology contents, to this, the present invention does not remake detailed explanation.
C2: the base station is determined to wish that terminal shifts to an earlier date or the transmission that lags behind, or is kept existing transmitting time according to comparing the time of advent of the time of advent of measuring and expectation, produces the synchronous control command word thus
C3: the base station sends the synchronous control command word by PTT downlink signaling channel;
C4: after terminal obtained the synchronous control command word, if the base station requires to keep, it is constant that then terminal just keeps the up signaling-information transmitting time of PTT; If lagging behind, the base station requirement sends, then the terminal step-length (as 1/8chip, this is measured by network configuration) that hysteresis is fixed on the transmitting time of the existing up signaling-information of PTT; If the base station requires to send in advance, then terminal is in the fixing in advance step-length (as 1/8chip, this is measured by network configuration) of the transmitting time of the existing up signaling-information of PTT.
Second kind is: when terminal by seizing, obtain the right to use of the up shared physical channel of PTT after, can be divided into two kinds of situations, 1 in this case again) the kind situation: network has been this terminal distribution PTT signaling channel; 2) kind situation: network does not distribute the PTT signaling channel for this user.Describe respectively at both of these case below.
1) kind situation: if after this terminal obtained the right to use of the up shared physical channel of PTT, network did not distribute the PTT signaling channel for this terminal.This situation comprises two processes:
First process is the process of setting up of uplink synchronous: at first terminal need be by sending UpPCH, and the base station is replied FPACH and obtained initial synchronisation then, specifically with the process of setting up of the top described uplink synchronous of multicast.Here repeat no more.But, after setting up process synchronously, carry out the maintenance of uplink synchronous by the up shared physical channel of PTT.Just, the up shared physical channel of base station measurement PTT, measurement result according to the up shared physical channel of PTT, and this measurement result and the time that wish to arrive compared, produce up synchronous control command word, by the emission of PTT Physical Downlink Shared Channel, terminal demodulation PTT Physical Downlink Shared Channel, obtain up synchronous control command word, carry out the uplink synchronous adjustment accordingly.
Second process is the process that uplink synchronous keeps: this process and above-mentioned terminal do not obtain under the situation of speaking right, the process that uplink synchronous kept when then network was terminal distribution PTT signaling channel is similar, just base station measurement is the time of reception of up shared physical signalling, and up shared physical channel controlled, send the synchronous control command word by descending shared physical signalling.Concrete implementation procedure is:
D1: the time of advent of the up shared physical signalling of base station measurement PTT; Its concrete method of measurement mainly is: the base station is detected receiving data, can obtain the time of advent of received signal.Wherein, to receiving the detection method of data, for a person skilled in the art, be disclosed technology contents, to this, the present invention does not remake detailed explanation.
D2: the base station is determined to wish that terminal shifts to an earlier date or the transmission that lags behind, or is kept existing transmitting time according to comparing the time of advent of the time of advent of measuring and expectation, produces the synchronous control command word thus
D3: the base station sends the synchronous control command word by the PTT Physical Downlink Shared Channel;
D4: after terminal obtained the synchronous control command word, if the base station requires to keep, it is constant that then terminal just keeps the up shared physical signalling transmitting time of PTT; If lagging behind, the base station requirement sends, then the terminal step-length (as 1/8chip, this is measured by network configuration) that hysteresis is fixed on the transmitting time of the existing up shared physical signalling of PTT; If the base station requires to send in advance, then terminal is in the fixing in advance step-length (as 1/8chip, this is measured by network configuration) of the transmitting time of the existing up shared physical signalling of PTT.
2) kind situation: if after this terminal obtained the right to use of the up shared physical channel of PTT, network was this terminal distribution PTT signaling channel.This situation also comprises two processes:
First process is the maintenance process of uplink synchronous: terminal is by the process of setting up synchronously of PTT signaling channel, obtain the Timing Advance of uplink synchronous, terminal is used the up Timing Advance transmission data of the Timing Advance of the up signaling-information of described PTT as the up shared physical channel of PTT.After bringing into use the up shared physical channel of PTT to send data, the up shared physical signalling time of reception of base station measurement PTT, measurement result according to the up shared physical channel of PTT, and this measurement result and the time of reception that wish to arrive compared, produce up synchronous control command word, by the emission of PTT Physical Downlink Shared Channel, terminal demodulation PTT Physical Downlink Shared Channel, obtain up synchronous control command word, carry out the uplink synchronous adjustment accordingly.The up signaling channel of PTT adopts the uplink synchronous time adjustment amount identical with the up shared physical channel of PTT.
This implementation procedure with do not distribute the PTT signaling channel different, saved the process of setting up that obtains uplink synchronous by FPACH, directly use the transmitting time of the up signaling-information of PTT to be used as the transmitting time of up shared physical signalling.Thereby improved the receptivity of terminal.
Second maintenance process that process is a uplink synchronous: this process and 1) second process of kind situation is consistent, it also is the time of reception of the up shared physical signalling of base station measurement, up shared physical signalling is controlled, sent the synchronous control command word by descending shared physical signalling.Terminal is carried out identical adjustment to up shared physical channel with up signaling channel according to the synchronous control command word of base station, and the synchronous control command word in the PTT downlink signaling channel abandons.Its specific implementation process sees 1 for details) plant second process of situation, here repeat no more.
And, receive only the PTT Physical Downlink Shared Channel for not obtaining the usufructuary terminal of the up shared physical channel of PTT, wherein synchronous control command word is abandoned.
By above-mentioned two kinds of situations as can be known, for obtaining the usufructuary terminal of the up shared physical channel of PTT, no matter distribute the PTT signaling channel or do not distributed the PTT signaling channel, after new terminal uses PTT to share physical channel, in the Synchronization Control of base station, need carry out the control of uplink synchronous to new terminal according to the coming into force a little of the speaking right of new terminal, mainly be that time of reception point to above-mentioned signal averages calculating, with the time of reception point generation control command word after average.The process of its average computation it be:
N express time point wherein,
The mean value of representing the n frame, p are the average factors, obtain according to emulation, get 1/15 now,
The mean value of representing the n-1 frame, x
nThe time of reception point of representing the n frame.
When new terminal was controlled, initial time was not because there is the mean value of previous frame,, was expressed as formula and was exactly as mean value with the time of reception point of present frame:
The follow-up time just can be passed through above-mentioned formula (1) calculating mean value, carries out Synchronization Control according to mean value.
In addition, the present invention provides the synchronisation control means of group-calling service in a kind of trunked communication system again, and the flow chart of described method sees Fig. 3 for details, and described method comprises step:
Step M10: if terminal only obtains the right to use of the up shared physical channel of PTT, then terminal is obtained the synchronous adjustment information of base station feedback, and adjusts the Timing Advance of uplink synchronous according to this synchronous adjustment information;
Step M11: base station measurement has the time of advent of the up shared physical signalling of PTT of speaking right terminal, and with the expectation the time of advent compare, determine uplink synchronous control command word according to comparative result, and described uplink synchronous control command word is sent to terminal by the PTT Physical Downlink Shared Channel;
Step M12: terminal is controlled the transmitting time of the up shared physical signalling of PTT according to the uplink synchronous control command word that obtains.
The implementation procedure of described step M10 is specially:
Step M100: terminal obtains initial synchronisation according to the signal that the base station issues, and the transmitting time of definite uplink pilot signal;
Step M101: terminal sends ascending pilot channel according to the transmitting time of described uplink pilot signal to the base station;
Step M102: the transmitting time of base station measurement uplink pilot signal, obtain the time of reception of uplink pilot signal, and calculate the time of reception of described uplink pilot signal and the time-delay deviation that the time of reception of uplink pilot signal is expected in the base station, and notify described terminal with this time-delay deviation;
Step M103: terminal realizes uplink synchronous according to the transmitting time of described time-delay deviation adjustment uplink pilot signal.
The formula that wherein calculates time-delay deviation among the step M102 is:
UpPCH
POS＝UpPTS
Rxpath-UpPTS
TS
Wherein, described UpPTS
RxpathBe that the base station receives the synchronous uplink pilot signal time of initial uplink; Described UpPTS
TSIt is the time that the base station expectation receives uplink pilot signal;
Terminal according to the formula of the transmitting time of time-delay deviation modulation uplink pilot signal is among the step M103:
UpPCH
NEWAVD＝UpPCH
OLDAVD+UpPCH
POS-8*16T
C
Wherein, described UpPCH
OLDAVDIt is the transmitting time that terminal realizes the UpPCH that initial uplink is determined down synchronously; Described UpPCH
POSBe the poor of the terminal that receives standard UpPCH time of sending UpPCH time and base station; Described UpPCH
NEWAVDIt is the transmitting time that terminal realizes determining under the accurate uplink synchronous UpPCH.
The specific implementation process of the method for the invention is same as above, here repeats no more.
In addition, the present invention provides the synchronisation control means of group-calling service in a kind of trunked communication system again, and the flow chart of described method sees Fig. 4 for details, and described method comprises step:
Step N10: if terminal obtains the right to use of the up shared physical channel of PTT, and obtain the PTT signaling channel of network allocation, terminal is with the transmitting time of the up signaling-information of the PTT transmitting time as the up shared physical signalling of PTT;
Step N11: the base station is by measuring the time of reception of the up shared physical signalling of PTT, and with the expectation time of reception compare, determine uplink synchronous control command word according to comparative result, and described uplink synchronous control command word is sent to terminal by the PTT Physical Downlink Shared Channel;
Step N12: terminal is carried out identical control to the up shared physical channel of PTT with the up signaling channel of PTT according to the described uplink synchronous control command word that obtains.
The specific implementation process of the method for the invention is same as above, here repeats no more.
Therefore, PTT business of the present invention belongs to a kind of business of new introducing for the TD-SCDMA trunked communication system, has also introduced the PTT channel simultaneously and (has comprised PTT up-downgoing signaling channel.Physical channel is shared in the PTT up-downgoing) etc. several new channels, at these channels, in present prior art, also do not have the Synchronization Control scheme.Therefore, the PTT channel that the present invention is directed to increase has proposed synchronisation control means, particularly the technical scheme that uplink synchronous is controlled.At first, in the control procedure of carrying out uplink synchronous, the process of setting up of initial uplink synchronous is necessary, be exactly that terminal is by sending the time of reception of UpPTS data, base station measurement terminal transmission UpPTS data, compare by time of reception with expectation, obtain the time-delay deviation of the two, and this time-delay deviation feeds back to terminal by FPACH, terminal is adjusted the time that sends data accordingly according to the time-delay deviation that obtains, terminal obtains initial uplink synchronous, this shows that it is necessary obtaining initial uplink synchronous process, otherwise system can't work.Then, carry out the process that uplink synchronous keeps on the synchronous basis of initial uplink, base station feedback synchronous control command word is a kind of function of enhancing property, and the base station is the receiving position of control terminal signal accurately, improves receptivity.In addition, the realization of synchronous maintenance process of the present invention, the variation of up transmitting time is released in the variation that can also measure the time of reception of downstream signal by terminal, adjusts the transmitting time of terminal accordingly, and this method also can realize the Synchronization Control process.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (11)
1. the synchronisation control means of multicast service in the trunked communication system is characterized in that, comprising:
A, terminal are obtained the synchronous adjustment information of base station feedback, and adjust the Timing Advance of uplink synchronous according to this synchronous adjustment information; Specifically comprise: A1) terminal obtains initial synchronisation according to the signal that the base station issues, and the transmitting time of definite uplink pilot signal; A2) terminal sends uplink pilot signal according to the transmitting time of described uplink pilot signal to the base station; A3) transmitting time of base station measurement uplink pilot signal, obtain the time of reception of uplink pilot signal, and calculate the time of reception of described uplink pilot signal and the time-delay deviation that the time of reception of uplink pilot signal is expected in the base station, and with this time-delay deviation notice terminal; A4) terminal realizes uplink synchronous according to the transmitting time of described time-delay deviation adjustment uplink pilot signal;
B, base station measurement have the time of advent of the up shared physical signalling of PTT of speaking right terminal, and with the expectation the time of advent compare, determine uplink synchronous control command word according to comparative result, and described uplink synchronous control command word is sent to terminal by the PTT Physical Downlink Shared Channel;
C, terminal are controlled the transmitting time of the up shared physical signalling of PTT according to the uplink synchronous control command word that obtains.
2. according to the synchronisation control means of multicast service in the described trunked communication system of claim 1, it is characterized in that steps A 3) in calculate time-delay deviation formula be:
UpPCH
POS＝UpPTS
Rxpath-UpPTS
TS
Wherein, described UpPTS
RxpathBe that the base station receives the synchronous uplink pilot signal time of initial uplink; Described UpPTS
TSIt is the time that the base station expectation receives uplink pilot signal; Described UpPCH
POSBeing time-delay deviation, is the poor of the terminal that receives standard UpPCH time of sending UpPCH time and base station;
Steps A 4) formula that terminal is adjusted the transmitting time of uplink pilot signal according to time-delay deviation in is:
UpPCH
NEWAVD＝UpPCH
OLDAVD+UpPCH
POS-8*16T
C
Wherein, described UpPCH
OLDAVDBe that terminal realizes the initial uplink transmitting time of down definite UpPCH synchronously; Described UpPCH
POSBeing time-delay deviation, is the poor of the terminal that receives standard UpPCH time of sending UpPCH time and base station; Described UpPCH
NEWAVDIt is the transmitting time that terminal realizes determining under the accurate uplink synchronous UpPCH; Described T
CBeing chip period, is the inverse of spreading rate.
3. according to the synchronisation control means of multicast service in the described trunked communication system of claim 1, it is characterized in that the content of described synchronous control command word comprises: determine the transmitting time of transmitting time that terminal shifts to an earlier date, hysteresis or keep existing transmitting time.
4. according to the synchronisation control means of multicast service in the described trunked communication system of claim 3, it is characterized in that terminal is carried out corresponding control according to the content in the described uplink synchronous control command word to uplink synchronous channel.
5. the synchronisation control means of group-calling service in the trunked communication system is characterized in that, comprising:
A, judge whether terminal obtains the right to use of up shared physical channel, if, execution in step B, otherwise, execution in step C;
B, judge whether terminal is assigned to the PTT signaling channel, if, terminal realizes the transmitting time of the up signaling-information of the PTT transmitting time as the up shared physical signalling of PTT up shared physical channel of PTT and the up signaling channel of PTT are carried out identical uplink synchronous control; Specifically comprise: E1) terminal is with the transmitting time of the up signaling-information of the PTT transmitting time as the up shared physical signalling of PTT; E2) time of reception of the up shared physical signalling of base station measurement PTT, and with the expectation time of reception compare, determine uplink synchronous control command word according to comparative result, and described uplink synchronous control command word is sent to terminal by the PTT Physical Downlink Shared Channel; E3) terminal is carried out identical control to the up shared physical channel of PTT with the up signaling channel of PTT according to the described upload control command word that obtains; Otherwise terminal realizes the uplink synchronous control to the up shared physical channel of PTT by sending the Timing Advance that uplink pilot signal obtains uplink synchronous; Specifically comprise: F1) terminal is obtained the synchronous adjustment information of base station feedback, and adjusts the Timing Advance of uplink synchronous according to this synchronous adjustment information; F2) time of reception of the up shared physical signalling of base station measurement PTT, and with the expectation time of reception compare, determine uplink synchronous control command word according to comparative result, send to terminal by the PTT Physical Downlink Shared Channel; F3) terminal is controlled the transmitting time of the up shared physical signalling of PTT according to uplink synchronous control command word;
If the C terminal only is assigned to the PTT signaling channel, time of advent of base station measurement PTT signaling-information then, and determine uplink synchronous control command word according to measurement result, the PTT signaling channel is carried out corresponding uplink synchronous control; Specifically comprise: H1) time of advent of the up signaling-information of base station measurement PTT, and compare determine uplink synchronous control command word, send to terminal by PTT downlink signaling channel according to relatively result with time of advent of expectation; H2) terminal is controlled the transmitting time of the up signaling-information of PTT according to uplink synchronous control command word.
6. according to the synchronisation control means of group-calling service in the described trunked communication system of claim 5, it is characterized in that described step F 1) implementation procedure be specially:
G1) terminal obtains initial synchronisation according to the signal that the base station issues, and the transmitting time of definite uplink pilot signal;
G2) terminal sends uplink pilot signal according to the transmitting time of determining uplink pilot signal to the base station;
G3) transmitting time of base station measurement uplink pilot signal, obtain the time of reception of uplink pilot signal, and calculate the time of reception of described uplink pilot signal and the time-delay deviation that the time that uplink pilot signal receives is expected in the base station, and with this time-delay deviation notice terminal;
G4) terminal realizes uplink synchronous according to the transmitting time of described time-delay deviation adjustment uplink pilot signal.
7. according to the synchronisation control means of group-calling service in the described trunked communication system of claim 6, it is characterized in that,
Step G3) formula that calculates time-delay deviation in is:
UpPCH
POS＝UpPTS
Rxpath-UpPTS
TS
Wherein, described UpPTS
RxpathBe that the base station receives the synchronous uplink pilot signal time of initial uplink; Described UpPTS
TSIt is the time that the base station expectation receives uplink pilot signal; Described UpPCH
POSBeing time-delay deviation, is the poor of the terminal that receives standard UpPCH time of sending UpPCH time and base station; Step G4) formula that terminal is adjusted the transmitting time of uplink pilot signal according to described time-delay deviation in is:
UpPCH
NEWAVD＝UpPCH
OLDAVD+UpPCH
POS-8*16T
C
Wherein, described UpPCH
OLDAVDIt is the transmitting time that terminal realizes the UpPCH that initial uplink is determined down synchronously; Described UpPCH
POSBeing time-delay deviation, is the poor of the terminal that receives standard UpPCH time of sending UpPCH time and base station; Described UpPCH
NEWAVDIt is the transmitting time that terminal realizes determining under the accurate uplink synchronous UpPCH; Described T
CBeing chip period, is the inverse of spreading rate.
8. according to the synchronisation control means of group-calling service in the described trunked communication system of claim 5, it is characterized in that the content of described uplink synchronous control command word comprises: determine the transmitting time of transmitting time that terminal shifts to an earlier date, hysteresis or keep existing transmitting time.
9. the synchronisation control means of group-calling service in the trunked communication system is characterized in that, comprising:
If the A terminal only obtains the right to use of the up shared physical channel of PTT, then terminal is obtained the synchronous adjustment information of base station feedback, and adjust the Timing Advance of uplink synchronous according to this synchronous adjustment information, specifically comprise: A1) terminal obtains initial synchronisation according to the signal that the base station issues, and the transmitting time of definite uplink pilot signal; A2) terminal sends uplink pilot signal according to the transmitting time of described uplink pilot signal to the base station; A3) transmitting time of base station measurement uplink pilot signal, obtain the time of reception of uplink pilot signal, and calculate the time of reception of described uplink pilot signal and the time-delay deviation that the time of reception of uplink pilot signal is expected in the base station, and notify described terminal with this time-delay deviation; A4) terminal realizes uplink synchronous according to the transmitting time of described time-delay deviation adjustment uplink pilot signal;
B, terminal receive the uplink synchronous control command word that the base station sends by the PTT Physical Downlink Shared Channel;
C, terminal are controlled the transmitting time of the up shared physical signalling of PTT according to the uplink synchronous control command word that obtains.
10. according to the synchronisation control means of group-calling service in the described trunked communication system of claim 9, it is characterized in that steps A 3) in calculate time-delay deviation formula be:
UpPCH
POS＝UpPTS
Rxpath-UpPTS
TS
Wherein, described UpPTS
RxpathBe that the base station receives the synchronous uplink pilot signal time of initial uplink; Described UpPTS
TSIt is the time that the base station expectation receives uplink pilot signal; Described UpPCH
POSBeing time-delay deviation, is the poor of the terminal that receives standard UpPCH time of sending UpPCH time and base station;
Steps A 4) terminal according to the formula of the transmitting time of time-delay deviation modulation uplink pilot signal is in:
UpPCH
NEWAVD＝UpPCH
OLDAVD+UpPCH
POS-8*16T
C
Wherein, described UpPCH
OLDAVDIt is the transmitting time that terminal realizes the UpPCH that initial uplink is determined down synchronously; Described UpPCH
POSBeing time-delay deviation, is the poor of receiving terminal standard UpPCH time of sending UpPCH time and base station; Described UpPCH
NEWAVDIt is the transmitting time that terminal realizes determining under the accurate uplink synchronous UpPCH; Described T
CBeing chip period, is the inverse of spreading rate.
11. the synchronisation control means of group-calling service is characterized in that in the trunked communication system, comprising:
If the A terminal obtains the right to use of the up shared physical channel of PTT, and obtain the PTT signaling channel of network allocation, terminal is with the transmitting time of the up signaling-information of the PTT transmitting time as the up shared physical signalling of PTT;
B, base station are by measuring the time of reception of the up shared physical signalling of PTT, and with the expectation time of reception compare, determine uplink synchronous control command word according to comparative result, and described uplink synchronous control command word is sent to terminal by the PTT Physical Downlink Shared Channel;
C, terminal are carried out identical control to the up shared physical channel of PTT with the up signaling channel of PTT according to the described uplink synchronous control command word that obtains.
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| CN101406076B (en) * | 2007-02-28 | 2010-06-02 | 华为技术有限公司 | System and method for confirming transmission time in radio communication system |
| CN101617556B (en) * | 2007-02-28 | 2013-08-28 | 华为技术有限公司 | System and method for providing communication in a radio communication system |
| CN102045638B (en) * | 2009-10-09 | 2014-12-10 | 中国移动通信集团公司 | Method and equipment for time synchronization |
| CN103179656B (en) | 2011-12-20 | 2017-11-17 | 中兴通讯股份有限公司 | The synchronization transfer method and system of Business Stream in a kind of heterogeneous network |
| WO2013097096A1 (en) * | 2011-12-27 | 2013-07-04 | 华为技术有限公司 | Method, device and system for providing synchronism deviation time |
| CN102664698A (en) * | 2011-12-27 | 2012-09-12 | 华为技术有限公司 | Method, device and system for providing synchronous deviation time |
| CN103582109B (en) * | 2012-07-23 | 2016-09-07 | 京信通信系统（中国）有限公司 | A kind of method for synchronizing time and device |
| CN107682074B (en) * | 2017-11-08 | 2024-03-29 | 南京天际易达通信技术有限公司 | Satellite uplink signal transmitting time compensation method, device and communication system |
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| WO2004013978A2 (en) * | 2002-08-01 | 2004-02-12 | Interdigital Technology Corporation | Method for coordinating paging occasions on a common paging channel |
| CN1567788A (en) * | 2003-07-04 | 2005-01-19 | 深圳市中兴通讯股份有限公司 | Forward frame number aligning method of CDMA standard trunked communication system |
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| WO2004013978A2 (en) * | 2002-08-01 | 2004-02-12 | Interdigital Technology Corporation | Method for coordinating paging occasions on a common paging channel |
| CN1567788A (en) * | 2003-07-04 | 2005-01-19 | 深圳市中兴通讯股份有限公司 | Forward frame number aligning method of CDMA standard trunked communication system |
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