CN1848706B - Method and system for synchronizing up-link - Google Patents
Method and system for synchronizing up-link Download PDFInfo
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- CN1848706B CN1848706B CN2005100639001A CN200510063900A CN1848706B CN 1848706 B CN1848706 B CN 1848706B CN 2005100639001 A CN2005100639001 A CN 2005100639001A CN 200510063900 A CN200510063900 A CN 200510063900A CN 1848706 B CN1848706 B CN 1848706B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2662—Arrangements for Wireless System Synchronisation
- H04B7/2671—Arrangements for Wireless Time-Division Multiple Access [TDMA] System Synchronisation
- H04B7/2678—Time synchronisation
- H04B7/2684—Synchronisation of a mobile station with more than one base station
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
- H04W56/0065—Synchronisation arrangements determining timing error of reception due to propagation delay using measurement of signal travel time
- H04W56/009—Closed loop measurements
Abstract
A method for carrying out synchronization of up link includes receiving request of switching UE (215) from BT1 (205) to BT2(210) by BT1 (205) at BT2 (210), sending UpPTS by BT2 (210) to UE (215) in order to send synchronous component request such as SYNC-UL field to BT2 (210), receiving synchronous component from UE (215) in assigned UpPTS on receiving power and on receiving time by BT2 (210), sending synchronization regulating information of up link to UE(215) by BT2 (210) based on estimation of receiving power and time at receiving synchronous component in UpPTS from UE (215) by BT2 (210).
Description
Technical field
Usually, the present invention relates between the node of communication system, carry out uplink synchronisation, more specifically, relate to the method and system that is used for carrying out uplink synchronisation in the TD-SCDMA communication system.
Background technology
In calendar year 2001, TD SDMA (TD-SCDMA) is accepted as the 3G mobile communication standard in China.TD-SCDMA is Advanced Time Division Multiple Access (TDMA) system, and it comprises Adaptive Code Division Multiple Access (CDMA) component, brings the many advantages for the terminal use.Through changing the size of various time frames, the TD-SCDMA communication system can be sent symmetry or asymmetric data, thereby uses communication bandwidth more efficiently.Like this, use time division duplex (TDD) principle, TD-SCDMA can distribute the time slot of the varying number of 5ms subframe to uplink service or downlink service.For example, for such as asymmetric services such as mobile phone or other subscriber equipment (UE) accesses, the time slot of distributing to down link is more than up link.This makes and compares dividing time slot fifty-fifty between BT and the UE, can send more multidata to UE from base station transceiver station (BT).For such as symmetry, Circuit-switched services such as Speech Communications,, optimized service through between BT and UE, dividing time slot equably.Method of uplink synchronization among the TD-SCDMA has also adopted new intelligent antenna technology, and it can reduce multiple access and disturb (MAI) and co-channel interference.Further, TD-SCDMA can adopt current techniques to realize, to allow seamlessly transitting from 2G to the 3G network.
Unfortunately, TD-SCDMA do not eliminate with BT between all difficult points of being associated of switching.UE is an extreme part and parcel most of mobile communications networks from the switching of a BT to the two BT.When UE moved in network, for the purpose of keeping communication and acceptable service quality (QoS), such switching usually was necessary.Mobile like this between adjacent BT as UE, make when frequency and vertical shift obtain keeping that soft handover takes place.In soft handover, can set up communication channel with new BT, temporarily keep channel simultaneously with existing BT.Only when the new channel with new BT reaches significant QoS, end former channel with old BT.When UE moves between adjacent BT, or UE moves to another switching center, and when vertical shift and/or frequency shift, direct-cut operation takes place.In direct-cut operation, when setting up new channel, can not temporarily keep former communication channel.Two types switching relates generally to difficulty, complicated process, and it causes the serious degradation of communication channel sometimes even loses communication channel.
Summary of the invention
Abide by an aspect, the present invention is a kind of method, and it is used to carry out uplink synchronisation, and it relates to the switching of subscriber equipment (UE) from the first base station transceiver station (BT1) to the second base station transceiver station (BT2).Method may further comprise the steps: receive UE switches to BT2 from BT1 request at the BT2 place from BT1.Thereafter, BT2 is sent in to UE and uses uplink pilot time slot (UpPTS) in the given sub-frame, to send such as requests of component synchronously such as SYNC_UL fields to BT2.Thereafter, BT2 receives synchronized component with the received power level with in the UpPTS of time in given sub-frame that receives from UE.Thereafter, based on in the power level of the reception of the synchronized component of BT2 from the UpPTS that UE receives and the estimation of the time of reception, BT2 sends uplink synchronisation adjusting information to UE.Because BT2 specifies particular UE and special time on UpPTS, to transmit synchronized component, reduced to relate to the risk that a plurality of UE attempt to disturb to the multiple access of single BT2 transmission (MAI) conflict simultaneously.
Abide by on the other hand, its angle from UE is described said method, the present invention includes UE and is received in from BT2 and uses uplink pilot time slot (UpPTS) the given sub-frame, to send the request of synchronized component.Thereafter, UE sends the synchronized component among the UpPTS in the given sub-frame to BT2.Thereafter, based on to the estimation from time of the power level of the reception of the synchronized component of UE to the UpPTS that BT2 sends and reception, UE is from BT2 receiving uplink adjusted in concert information.
Abide by another aspect, the present invention is a kind of system, and it is used to carry out uplink synchronisation, and it relates to the switching from BT1BT2.System comprises UE, and it is suitable for: be received in from BT2 and use UpPTS to send the request of synchronized component the given sub-frame; In the UpPTS of BT2 given sub-frame, send synchronized component from UE; And based on to estimation from time of the power level of the reception of the synchronized component of UE to the UpPTS that BT2 sends and reception, at the UE place from BT2 receiving uplink adjusted in concert information.
Description of drawings
For making easy to understand of the present invention and coming into operation, now will be with reference to appended drawing, carry out the quoting of specific embodiment, the wherein similar similar assembly of reference number indication, wherein:
Fig. 1 is the chart of explaination TD SDMA (TD-SCDMA) frame structure;
Fig. 2 is the sketch map that explaination comprises the communication system of the first base station transceiver station (BT1), the second base station transceiver station (BT2) and subscriber equipment (UE);
Fig. 3 is the flow chart of the method for the closed-loop uplink link synchronization in the explaination TD-SCDMA system, and it abides by prior art;
Fig. 4 is the message sequence chart (MSC) of explaination TD-SCDMA process of uplink synchronization, and it abides by embodiments of the invention;
Fig. 5 is the flow chart of a kind of method of explaination, and this method is used for carrying out uplink synchronisation in the TD-SCDMA switching of UE from BT1 to BT2, and it abides by embodiments of the invention; With
Fig. 6 is the flow chart of explaining a kind of method from the angle of UE, and this method is used for carrying out uplink synchronisation in the TD-SCDMA switching of UE from BT1 to BT2, and it abides by embodiments of the invention.
Embodiment
With reference to Fig. 1, this is the chart of explaination TD SDMA (TD-SCDMA) frame structure.TD-SCDMA uses unique code to separate a plurality of users at given base station transceiver station (BT) with time slot.The TD-SCDMA frame is divided into long radio frames of 10ms and the long subframe of 5ms.Thereafter, be seven time slots with each sub-frame division, and down link pilot timeslot (DwPTS), comprise the SYNC_DL field, and uplink pilot time slot (UpPTS), comprise the SYNC_UL field, separate by the protection period (GP) respectively.Each TD-SCDMA time slot holds a pulse of lucky 2560 chips.
With reference to Fig. 2, this is the sketch map that explaination comprises the communication system 200 at the first base station transceiver station (BT1) 205 and the second base station transceiver station (BT2) 210.Shown subscriber equipment (UE) 215, it moves in the scope of BT2210 in the scope of BT1205.UE 215 can be, such as mobile phone is the mobile communication equipment of other type perhaps, for example PDA(Personal Digital Assistant) or notebook computer.When UE 215 shifts out outside the scope of BT1, for keeping communicating by letter of third party's (not shown) and UE 215, must carry out switching flow, wherein UE 215 transfers to BT2210 with its communication link from BT1205.Yet, if UE 215 begins to send asynchronous signals to BT2 210 when initiate switching, signal maybe with other Communication Jamming of just sending and receiving at BT2 210 places, promptly be called the phenomenon that multiple access disturbs (MAI).MAI can make the performance serious degradation of cdma system.Therefore, before switching can be carried out, must between UE 215 and BT2 210, accomplish the process of uplink synchronisation.
With reference to Fig. 3, this is the flow chart of the method 300 of the closed-loop uplink link synchronization in the explaination TD-SCDMA system, and it abides by prior art.At first, in step 305, UE 215 must analyze the SYNC_DL field among the DwPTS, to judge that it is suitable that its communication link is switched to BT2 210 from BT1 205.This judgement is based on propagation delay time and the power level that UE 215 places indicate from the SYNC_DL field that BT2 210 receives.In step 310, UE215 is synchronously from the down link of BT2210.Then, in step 315, UE 215 sends the SYNC_UL field in UpPTS.UE 215 regulates timing and the power level of UpPTS based on the power level and timing of the DwPTS that receives.As alternative another replacement scheme, UE 215 can regulate timing and the power level of UpPTS based on the Primary Common Control Physical Channel (P-CCPCH) from BT2 210 transmissions that receives.In step 320, the power level of the SYNC_UL field of sending from UE 215 that BT2 210 assessment receives with regularly.In step 325, BT2 210 sends adjusting information to UE 215 in the TS0 time slot, points out UE 215 in its transmission next time, to regulate its power level and timing.At last, in step 330, between UE 215 and BT2 210, set up uplink synchronisation.
The closed-loop uplink link synchronization method 300 of the prior art of explaining among above-mentioned Fig. 3 has some shortcomings.At first, two or more UE 215 can send the SYNC_UL field to single BT2 210 simultaneously, cause MAI.Such MAI possibly require UE 215 repeatedly to send the SYNC_UL field again---further increase the flow load in the system 100.Secondly; When in step 320; When BT2 210 assessed from the SYNC_UL field of UE 215, BT2 210 can not distinguish the SYNC_UL field that relates to switching and the calibration power that relates to that when UE 215 opens in the scope of BT2 210 for the first time, takes place increases the SYNC_UL field that SYNC_UL asks.Yet, as those skilled in the art will recognize that, for improving service quality (QoS), must give the handoff request specific power increases the much higher priority of flow process.Further, SYNC_UL request and the processing load of normal power increase SYNC_UL request having increased on the BT2 210 are switched in merging, and this also possibly make system effectiveness degenerate.
The method of uplink synchronization that is used for switching flow of another prior art is an open-loop method.Abide by open-loop method, UE 215 receives the SYNC_DL field from BT1 205 and BT2 210 concomitantly.Through estimating that from the timing difference between the signal of BT1 205 and BT2 210 receptions UE 215 is that uplink signal calculates the timing adjusting of estimating.Yet the accuracy of such open-loop method generally is lower than above-mentioned closed-loop policy, and open-loop method is unwell to the situation that BT1 205 and BT2 210 operate in different frequency.
The present invention has overcome the many shortcomings that are associated with open loop link method of uplink synchronization with the closed loop link of prior art.With reference to Fig. 4, this is the message sequence chart (MSC) of explaination TD-SCDMA process of uplink synchronization, and it abides by embodiments of the invention.Process relates to the switching of UE 215 from BT1 205 to BT2 210, and is as shown in Figure 2.Further, in Fig. 4, UE 215 is in single user state at the beginning, and promptly UE 215 keeps the voice call connection through BT1 205 routes.Abide by the TD-SCDMA standard, and before handoff procedure begins, in message 1, UE 215 is every to be kept and the communicating by letter of BT1 205 at a distance from 5ms.UE 215 also monitors the signal strength signal intensity from adjacent BT station.In message 2, UE 215 receives signal from BT2 210, measures the signal quality that receives, and judges that the BT2210 signal quality is higher than BT1 205 (signal quality).In message 3, UE 215 is to the measurement of BT1 205 report BT2 210 signal qualitys.In message 4, BT1 205 tells BT2 210, and UE215 seeks to proceed to the switching of BT2 210.In message 5, BT2 210 requires UE 215 transmission to insert pulse, comprises the SYNC_UL field in next subframe on the UpPTS.BT2 210 specifies particular UE 215 and special time to come the fact of transmission SYNC_UL field on UpPTS, has eliminated the possibility of sending the MAI conflict that produces owing to a plurality of UE simultaneously to single BT2210.Such MAI conflict that relates to UpPTS has been discussed when relating to the closed loop switching flow of prior art above.
In message 6, UE 215 sends on UpPTS and inserts pulse, and it abides by the power level of the P-CCPCH on the UpPTS of BT2 of power level and/or reception of DwPTS of the BT2 that receives.At last, in message 7, BT2210 calculates timing advance error (timing advanceerror) and in the TS0 time slot, sends response to UE 215, and this response comprises synchronized component, and how its notice UE 215 regulates subsequent transmission regularly.Abide by present TD-SCDMA standard, augment the UpPTS and the TS0 time slot of carrier wave, for example those among the BT2 in the system 100 are not used in special-purpose Speech Communication.Therefore, abide by embodiments of the invention, UE 215 can keep the special-purpose Speech Communication with BT1 205, and at this moment, UE 215 side by side carries out the presynchronization task with BT2 210, comprises the task of relating to message 1 to 7 shown in Figure 4.Because UpPTS and TS0 time slot are not used in special-purpose Speech Communication, extra presynchronization task does not increase the processing demands on the UE 215.
For further describing embodiments of the invention, with reference to Fig. 5, this is the flow chart of a kind of method 500 of explaination, and this method is used for carrying out uplink synchronisation in the TD-SCDMA switching of UE 215 from BT1205 to BT2210.Main angle describing method 500 from BT2 210.At first, in step 505, between UE 215 and BT2 210, set up downlink synchronization.In step 510, BT1 205 receives the downlink signal strength about BT1 205 and BT2 210 from UE 215.Thereafter, in step 515, BT2 210 receives UE 215 switches to BT2 210 from BT1205 request from BT1 205.In step 520, BT2 210 sends the request that the UpPTS that uses in the given sub-frame to send to BT2210 synchronized component to UE 215.As stated, in the TD-SCDMA system, synchronized component is generally the SYNC_UL field.Then, in step 525, BT2 210 is received in the synchronized component that step 520 is asked from UE 215.Synchronized component receives in the specified subframe of step 520, and receives with the received power level measured by BT2 210 and the time of reception.At last, in step 530, based on to the power level of the reception of the synchronized component from the UpPTS that UE 215 receives at the BT2210 place and the assessment of the time of reception, BT2 210 sends uplink synchronisation adjusting information to UE 215.Set up uplink synchronisation UE 215 and BT2 210 between thereafter.
With reference to Fig. 6, this is the flow chart of a kind of method 600 of explaination, and this method is used for carrying out uplink synchronisation at UE 215 from the TD-SCDMA switching of BT1 205 to BT2 210, and it abides by embodiments of the invention.Yet method 600 is to describe from the angle of UE 215.At first, in step 605, UE 215 receives the request that the UpPTS that uses the given sub-frame sends synchronized component (for example SYNC_UL field) from BT2 210.In step 610, UE 215 is sent in the synchronized component among the UpPTS in the specified subframe of step 605 to BT2 210.In step 615, UE 215 is from BT2 210 receiving uplink adjusted in concert information, and it is based on to the assessment from time of the power level of the reception of the synchronized component of UE 215 to the UpPTS that BT2 210 sends and reception.
Those skilled in the art will recognize that above-described method 500 and 600 is the switching situations and the switching situation that relates to a plurality of frequencies that are used to relate to single frequency.In other words, method 500 and 600 is applicable to the switching of UE 215 from BT1 205 to BT2 210, and wherein BT1 205 operates on the same frequency with BT2 210, and perhaps wherein BT1 205 operates on the different frequency with BT2 210.
Therefore, embodiments of the invention comprise following advantage.At first, BT2 210 specifies particular UE 215 and special time with the fact of transmission SYNC_UL field on UpPTS, has reduced to relate to a plurality of UE 215 and has attempted the risk to the MAI conflict of single BT2 210 transmissions simultaneously.Secondly, abide by another embodiment of the present invention,, reduced the possibility of standing and disturbing with other base station transceiver (BT) because synchronized component only sends once to BT2 210 from UE 215.This means that also BT2 210 needn't be constantly monitors UpPTS augmenting on the carrier wave, and wherein BT2210 can receive from BT1 205 and switch, thereby has reduced will cause BT2 210 to detect the chance of the synchronized component among the UpPTS by error from the interference of other BT.The 3rd, abide by embodiments of the invention, UE 215 can keep the special-purpose Speech Communication with BT1 205, and at this moment, UE 215 side by side carries out the presynchronization task with BT2210.
Top detailed description only provides specific exemplary embodiment, and has no intention to limit scope of the present invention, applicability or configuration.The detailed description of specific exemplary embodiment provides such description to those skilled in the art, and it allows them to realize specific exemplary embodiment of the present invention.It will be appreciated that, can carry out various variations in the function of assembly and step with arranging, and not depart from described essence of the present invention of claims and the scope liked enclosed.
Claims (17)
1. method that is used to carry out uplink synchronisation, it relates to the switching of user equipment (UE) from the first base station transceiver station BT1 to the second base station transceiver station BT2, said method comprising the steps of:
Receive said UE switches to said BT2 from said BT1 request at said BT2 place from said BT1;
Be sent in use uplink pilot time slot UpPTS the given sub-frame from said BT2 to said UE, to send the request of synchronized component to said BT2;
Sentence the power level of reception and in the UpPTS of time in said given sub-frame of reception, receive synchronized component at said BT2 from said UE; With
Based on to the received power level of the said synchronized component from the said UpPTS that said UE receives and the estimation of time of reception, send uplink synchronisation from said BT2 to said UE and regulate information at said BT2 place.
2. the method for claim 1, wherein said method is as the part of TD-SCDMA communication system and implement, and wherein, the said synchronized component among the said UpPTS is the SYNC_UL field.
3. the method for claim 1, it further may further comprise the steps receive UE switches to BT2 from BT1 the step of request from BT1 at the BT2 place before:
Between said UE and said BT2, set up downlink synchronization; With
Receive downlink signal strength at said BT1 place from said UE about said BT1 and said BT2.
4. the method for claim 1, wherein be sent in to UE and use UpPTS the given sub-frame, comprise with the step of sending the request of synchronized component to BT2: in next subframe, use the request of UpPTS from BT2.
5. the method for claim 1, wherein receiving at said BT2 place within four sub-frame of said synchronized component, sending said uplink synchronisation from said BT2 to said UE and regulate information.
6. the method for claim 1, wherein in the TS0 time slot, send said uplink synchronisation to said UE and regulate information from said BT2.
7. the method for claim 1; Wherein, Said synchronized component at said BT2 place from the said UpPTS that said UE receives is to be sent with such power level by said UE, and this power level is based on the power level of the synchronized component from the down link pilot timeslot DwPTS that said BT2 sends of said UE place reception.
8. the method for claim 1; Wherein, Said synchronized component at said BT2 place from the said UpPTS that said UE receives is to be sent with such power level by said UE, and this power level is based on the power level of the synchronized component from the Primary Common Control Physical Channel P-CCPCH that said BT2 sends of said UE place reception.
9. method as claimed in claim 8 wherein, is mapped to said P-CCPCH the channel of TS0 time slot.
10. method that is used to carry out uplink synchronisation, it relates to the switching of user equipment (UE) from the first base station transceiver station BT1 to the second base station transceiver station BT2, said method comprising the steps of:
Be received in use uplink pilot time slot UpPTS the given sub-frame at said UE place from said BT2, to send the request of synchronized component;
In the UpPTS of said BT2 said given sub-frame, send synchronized component from said UE; With
Based on to from the received power level of the said synchronized component of said UE to the said UpPTS that said BT2 sends and the estimation of time of reception, at said UE place from said BT2 receiving uplink adjusted in concert information.
11. a system that is used to carry out uplink synchronisation, it relates to the switching of user equipment (UE) from the first base station transceiver station BT1 to the second base station transceiver station BT2, and it comprises:
Be used for being received in given sub-frame and use the device of uplink pilot time slot UpPTS with the request of transmission synchronized component from said BT2;
Be used for to the UpPTS of said BT2, sending the device of synchronized component in said given sub-frame from said UE; And
Based on to from the received power level of the said synchronized component of said UE to the said UpPTS that said BT2 sends and the estimation of time of reception, at said UE place from the device of said BT2 receiving uplink adjusted in concert information.
12. system as claimed in claim 11, wherein, said system is as the part of TD-SCDMA communication system, and wherein, the said synchronized component among the said UpPTS is the SYNC_UL field.
13. system as claimed in claim 11; Wherein, Be received in from BT2 the given sub-frame use UpPTS with the request of sending synchronized component before, between said UE and said BT2, set up downlink synchronization and from said UE to the downlink signal strength of said BT1 transmission about said BT1 and said BT2.
14. system as claimed in claim 11 wherein, is receiving at said BT2 place within four sub-frame of said synchronized component, receives said uplink synchronisation at said UE place from said BT2 and regulates information.
15. system as claimed in claim 11, wherein, the said uplink synchronisation adjusting information that receives from said BT2 at said UE place receives the TS0 time slot.
16. system as claimed in claim 11; Wherein, From the said synchronized component of said UE to the said UpPTS that said BT2 sends is to be sent with such power level by said UE, and this power level is based on the power level of the synchronized component from the down link pilot timeslot DwPTS that said BT2 sends of said UE place reception.
17. system as claimed in claim 11; Wherein, From the said synchronized component of said UE to the said UpPTS that said BT2 sends is to be sent with such power level by said UE, and this power level is based on the power level of the synchronized component from the Primary Common Control Physical Channel P-CCPCH that said BT2 sends of said UE place reception.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100639001A CN1848706B (en) | 2005-04-12 | 2005-04-12 | Method and system for synchronizing up-link |
| PCT/US2006/013532 WO2006110774A2 (en) | 2005-04-12 | 2006-04-12 | Method and system for performing uplink synchronization |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100639001A CN1848706B (en) | 2005-04-12 | 2005-04-12 | Method and system for synchronizing up-link |
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| CN1848706A CN1848706A (en) | 2006-10-18 |
| CN1848706B true CN1848706B (en) | 2012-05-09 |
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| CN2005100639001A Active CN1848706B (en) | 2005-04-12 | 2005-04-12 | Method and system for synchronizing up-link |
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| WO (1) | WO2006110774A2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101801048B (en) * | 2008-11-26 | 2012-06-06 | 联发科技股份有限公司 | Method for setting transmission time sequence and initial transmission advance time sequence of uplink |
| CN101621843B (en) * | 2009-07-28 | 2011-11-09 | 新邮通信设备有限公司 | Uplink synchronization method, network side equipment, user equipment (UE) and mobile communication system |
| US8798030B2 (en) | 2010-04-07 | 2014-08-05 | Qualcomm Incorporated | Facilitating uplink synchronization in TD-SCDMA multi-carrier systems |
| US9271203B2 (en) | 2010-05-25 | 2016-02-23 | Qualcomm Incorporated | Alternate transmission scheme for high speed packet access (HSPA) |
| CN102318415B (en) * | 2010-10-21 | 2014-08-20 | 高通股份有限公司 | Facilitating uplink synchronization in TD-SCDMA multi-carrier systems |
| CN102457897A (en) * | 2011-10-21 | 2012-05-16 | 上海金陵表面贴装有限公司 | Method and device for detecting interference to uplink pilot channel of base station of time division-synchronization code division multiple access (TD-SCDMA) system |
| CN111541475B (en) * | 2020-04-23 | 2022-02-08 | 中国电子科技集团公司第五十四研究所 | Time-frequency synchronization method in voice service of satellite mobile communication system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1349358A (en) * | 2000-10-18 | 2002-05-15 | Lg电子株式会社 | Method for controlling over area switching in up-ward link synchronous transmission program |
| CN1383632A (en) * | 2000-06-12 | 2002-12-04 | 三星电子株式会社 | Method of assigning uplink random access channel in CDMA mobile communication system |
| CN1401197A (en) * | 2000-02-24 | 2003-03-05 | 西门子信息通讯网络公司 | Method for optimizing the random access procedures in the cdma cellular networks |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1401197A (en) * | 2000-02-24 | 2003-03-05 | 西门子信息通讯网络公司 | Method for optimizing the random access procedures in the cdma cellular networks |
| CN1383632A (en) * | 2000-06-12 | 2002-12-04 | 三星电子株式会社 | Method of assigning uplink random access channel in CDMA mobile communication system |
| CN1349358A (en) * | 2000-10-18 | 2002-05-15 | Lg电子株式会社 | Method for controlling over area switching in up-ward link synchronous transmission program |
Also Published As
| Publication number | Publication date |
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| WO2006110774A2 (en) | 2006-10-19 |
| CN1848706A (en) | 2006-10-18 |
| WO2006110774A3 (en) | 2009-04-23 |
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