CN1820431B - Frame synchronization in universal mobile telephone system - Google Patents
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- CN1820431B CN1820431B CN038268701A CN03826870A CN1820431B CN 1820431 B CN1820431 B CN 1820431B CN 038268701 A CN038268701 A CN 038268701A CN 03826870 A CN03826870 A CN 03826870A CN 1820431 B CN1820431 B CN 1820431B
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- 238000012545 processing Methods 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 15
- 238000005070 sampling Methods 0.000 claims description 10
- 238000004891 communication Methods 0.000 description 11
- 230000001360 synchronised effect Effects 0.000 description 7
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 230000011664 signaling Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 3
- 230000001186 cumulative effect Effects 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000000875 corresponding effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 206010027336 Menstruation delayed Diseases 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
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- 230000001413 cellular effect Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
- H04B1/7083—Cell search, e.g. using a three-step approach
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
- H04B1/70735—Code identification
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0602—Systems characterised by the synchronising information used
- H04J3/0605—Special codes used as synchronising signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0602—Systems characterised by the synchronising information used
- H04J3/0605—Special codes used as synchronising signal
- H04J3/0608—Detectors therefor, e.g. correlators, state machines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/0015—Synchronization between nodes one node acting as a reference for the others
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/04—Scheduled access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/04—Interfaces between hierarchically different network devices
- H04W92/10—Interfaces between hierarchically different network devices between terminal device and access point, i.e. wireless air interface
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
A Universal Mobile Telephone System (UMTS) receiver performs slot synchronization using a received primary synchronization channel (PSCH) (305). Subsequent to completion of slot synchronization, the UMTS receiver performs frame synchronization using a received secondary synchronization channel (SSCH) (320) in such a way that the UMTS receiver uses the received primary synchronization channel (PSCH) to detect a change in channel conditions (325, 330, 335, 350, 355, 360).
Description
Technical field
The present invention relates generally to radio receiver, more specifically, relate to for example universal mobile telephone system (UMTS), based on the subscriber equipment in the wireless system of spread spectrum (UE).
Background technology
Basic time unit in the UMTS radio signal is 10 milliseconds of (ms) radio frames, and each is divided into 15 time slots of 2560 chips.(or base station) is " downstream signal " to the UMTS radio signal of UMTS receiver from the sub-district, and reverse radio signal is called as " upward signal ".When at first opening the UMTS receiver, the UMTS receiver is carried out " Cell searching " and is searched for the sub-district that will communicate with it.Particularly, and be described below, initial UMTS receiver is sought the descending synchronous signal channel (SCH) that sends from the sub-district, so as synchronous with it on time slot and frame grade, and the specific scramble codes group of definite sub-district.Only after the Cell searching of success, just can begin voice/data communications.
For Cell searching, SCH is a sparse downlink channel effective during preceding 256 chips of each time slot.SCH is become with time two groups of subchannels of SCH (SSCH) by main SCH (PSCH).For all sub-districts, PSCH 256 chip sequences or PSCH code all are identical in all time slots of SCH.On the contrary, SSCH 256 chip sequences or SSCH code can be different in each of 15 time slots of radio frame, and are used to discern one of 64 possible scrambler groups.In other words, each radio frame of SCH repeats and each relevant scrambler group sequence in transmission sub-district.Each SSCH code is taken from the alphabet of 16 possibility SSCH codes.
As the part of Cell searching, the UMTS receiver at first uses PSCH to realize slot synchronization.In this, the UMTS receiver is correlated with the reception sampling of the PSCH that receives with known PSCH256 chip sequence (all is identical for all time slots), according to the position of correlation peak, determine the time slot reference time.When definite time slot during the reference time, the UMTS receiver is carried out slot synchronization, and the UMTS receiver can be determined the time started of each time slot in the radio frame that receives.
After slot synchronization, the UMTS receiver stops processing and the beginning treatment S SCH of PSCH.Particularly, the UMTS receiver carries out the particular sequence of 15 SSCH codes in the radio frame that receives and known sequence relevant, and is synchronous with achieve frame, and the scrambler group of definite sub-district.So the identification of scrambler group makes the UMTS receiver carry out descrambling to all other down channels (for example Common Pilot Channel (CPICH)) of sub-district, so that the beginning voice/data communications.
Unfriendly, there are some shortcomings in above-mentioned cell search process.One of them is the time.Because SSCH handles the sign that relates to 15 specific SSCH code sequences, typically on a plurality of reception radio frames, for example 10 to 20, the SSCH code process takes place.Therefore, finishing of Cell searching may spend for 100 times to the 200ms magnitude.Another shortcoming is the descrambling that takes place after completing successfully above-mentioned Cell searching as mentioned above.Similarly, and, may during handling, SSCH change by channel condition especially because the UMTS receiver can move, thus UMTS receiver forfeiture slot synchronization (for example correlation peak moves or disappears).If this occurs, SSCH handles and may fail.In addition, the UMTS receiver does not detect this failure, finishes up to the SSCH processing.Therefore, must restart whole cell search process, further prolong the user and must wait for up to the time that can begin voice/data communications.
Summary of the invention
Therefore, according to principle of the present invention, wireless receiver uses first synchronizing channel that receives to carry out slot synchronization, and after finishing slot synchronization, according to use first synchronizing channel that receives to detect the mode of the variation on the channel condition by wireless receiver, use the SSC Secondary Synchronisation Code that receives to carry out frame synchronization.
In an embodiment of the present invention, wireless receiver is the part of UMTS subscriber equipment (UE), and first synchronizing channel is the PSCH subchannel, and SSC Secondary Synchronisation Code is the SSCH subchannel.During SSCH handled monitor channel conditions, wireless receiver continued to handle PSCH.Particularly, if PSCH subchannel relevant correlation peak in territory drops under the predetermined threshold, then suspend SSCH and handle.If suspended the SSCH processing in the cycle, then restart SSCH and handle at predetermined initial time.Yet if suspended the SSCH processing after the cycle at predetermined initial time, SSCH handles and attempts estimating the scrambler group according to current cumulative data.In other words, the PSCH channel is as " early warning " system, and the sudden change of morning inspection measured channel, has therefore saved the processing time and has reduced that the user must wait for the whole time that begins voice/data communications opening UE after.
According to another embodiment of the invention, small region search method uses PSCH to handle as the PWI that changes channel condition, and the variation on SSCH processing notification channel condition.Therefore, prevent that the SSCH processing from continuing under the situation that channel condition significantly changes, if allow SSCH to handle continuation, the result then can lead to errors.
Description of drawings
Fig. 1 shows the part of illustrative wireless communication system in accordance with the principles of the present invention;
Fig. 2 and 3 shows the illustrative embodiment of wireless receiver in accordance with the principles of the present invention; And
Fig. 4,5 and 6 shows illustrative flow in accordance with the principles of the present invention.
Embodiment
Except notion of the present invention, unit shown in the drawings is known, is not elaborated.In addition, suppose to know wireless communication system, and be not elaborated at this based on UMTS.For example, except notion of the present invention, spread spectrum transmission and reception, sub-district (base station), subscriber equipment (UE), down channel, up channel and Rake receiver are known, do not describe at this.In addition, can use traditional programming technique to realize notion of the present invention, similarly not describe at this.At last, the similar similar unit of numeral in the accompanying drawing.
The illustrative part of UMTS wireless communication system 10 in accordance with the principles of the present invention has been shown among Fig. 1.Sub-district (or base station) 15 broadcasting comprise descending synchronous signal channel (SCH) signal 16 of above-mentioned PSCH and SSCH subchannel.As mentioned above, the synchronous purpose that by UMTS subscriber equipment (UE) SCH signal 16 is used for the voice/data communications prerequisite.For example, UE is at " Cell searching " operating period treatment S CH signal.In this example, when powering up when for example unlatching or to UE 20, for example cellular UE 20 starts Cell searchings.The purpose of cell search comprises (a) synchronized cells transmission on the time slot of UMTS radio frame and frame grade, and the scrambler group of (b) determining sub-district (for example the sub-district 15).As described below, and according to principle of the present invention, UE 20 is when using the PSCH subchannel to come to change in the monitor channel conditions, and treatment S SCH subchannel is realized the frame synchronization with sub-district 15.Should note, although in the context of following example based on search of initial zone (promptly when opening UE 20) notion of the present invention has been shown, notion of the present invention is not limited to this, but can be applicable to other example of Cell searching, for example when UE is in " idle pulley ".
Turn to Fig. 2 now, show the illustrative block diagram of the part of UE 20 in accordance with the principles of the present invention.UE 20 comprises front end 105, analog to digital (A/D) transducer 110, cell search unit 115, searcher unit 120, Rake receiver 125, host interface block 130 and processor 135.Should also be noted that except notion of the present invention, in piece shown in Figure 2, can also comprise other unit known in the field, yet not describe in order to simplify.For example, A/D converter 110 can comprise digital filter, buffer etc.
Turn to Fig. 3 now, show the illustrative block diagram of cell search unit 115.Cell search unit 115 comprises PSCH unit 205 and SSCH unit 210.Now also should be with reference to figure 4, Fig. 4 shows according to the principle of the invention, be used to utilize the cell search unit 115 of Fig. 3 to handle the illustrative flow of descending PSCH and SSCH subchannel.In step 305, the processor 135 of UE 20 starts Cell searching, by handling descending PSCH subchannel, attempts realizing slot synchronization in step 305.Particularly, processor 135 activates PSCH unit 205 via signaling 206, makes it receive sampling 111 according to handle well known in the artly.For example, because descending PSCH subchannel is known PSCH 256 chip sequences or the PSCH code that periodically occurs (promptly repeating) in each time slot of descending SCH signal, 205 pairs of PSCH unit receive sampling 111 and PSCH code and carry out relevantly, and provide the peak correlation value of association.In this, PSCH unit 205 comprises the buffer (two all do not illustrate) of the output signal of matched filter and storage matched filter.PSCH unit 205 offers processor 135 via signaling 206 with peak value.Can be on a plurality of time slots of the radio frame that receives (for example four to 20 time slots) average this peak value, reduce the probability of " spurious lock ".If peak value is not more than predetermined threshold, processor 135 control PSCH unit 305 continue to handle any received signal, continue to search the sub-district.Yet, if peak value greater than predetermined threshold, UE 20 finishes slot synchronization, and processor 135 is at frame synchronization, continues cell search process, and the specific scramble codes group of definite related cell.Optionally method is when peak correlation value exceeds predetermined additive factor of the highest correlation of the next one or multiplication factor, must finish slot synchronization.
Particularly, in the step 310 of Fig. 4, and according to principle of the present invention, processor 135 is enabled SSCH unit 210 and PSCH unit 205.The sampling 111 that receives is handled according to prior art in SSCH unit 210 knownly, is used to attempt frame synchronization and is used to discern the scrambler group of sub-district 15.The PSCH subchannel is handled in PSCH unit 205, as the early warning detector that is used for monitoring or detecting the change on the channel condition during SSCH handles.
Turn to Fig. 5 now, illustrate in greater detail the step 310 of Fig. 4.Illustrative ground, step 310 comprise with SSCH handles relevant step 320 and the step 325,330,335 relevant with monitor channel conditions.Step 330 is corresponding with SSCH processing known in the field, and is carried out by the SSCH unit 210 and the processor 135 of Fig. 2 and 3 respectively with coming illustrative.SSCH unit 210 links to each other with processor 135 via signaling 211.As mentioned above, for specific cell, SSCH 256 chip sequences or SSCH code are different in each of 15 time slots of radio frame.Similarly, each radio frame repeats unique 15 the SSCH codes relevant with specific cell.When being activated by processor 135, SSCH unit 210 makes the particular sequence of 15 SSCH codes in the radio frame that receives relevant with known sequence, and it is synchronous and be used for the scrambler group (at this, being the scrambler group relevant with sub-district 15) of definite sub-district to be used for achieve frame.As mentioned above, SSCH handles and may need to handle a plurality of radio frames that receive, and for example 10 to 20, because for the Robust Estimation of the 15SSCH code sequence that obtains to receive, UE 20 is on average relevant on the successive frame of data.Therefore, SSCH duration of handling at 100ms on the 200ms magnitude.Unfriendly, at this moment between image duration, UE 20 may lose slot synchronization.Therefore, according to the solution of the present invention, the early warning detector that processor 135 uses PSCH unit 205 to change as channel condition during SSCH handles.In this, when Activate SS CH handled, processor 135 was also enabled the timer (not shown) and is come at step 320 tracking process time (below describe).As is known in the art, can in software and/or hardware, realize timer.
Particularly, in step 325, during each time slot, PSCH unit 205 makes the sampling 111 that receives relevant with known PSCH code, and via signaling 206 value of corresponding correlation peak is offered processor 135.In step 330, processor 135 compares correlation peak and the predetermined threshold that receives.Should be noted that if stronger peak value (for example from different sub-districts) also it doesn't matter, importantly still exist original peak value (be current SSCH handle at that, promptly from the signal of sub-district 15) (even it is very faint now).In this, if the value of the correlation peak that receives, thinks then that channel condition does not change and processor 135 execution in step 335 greater than predetermined threshold (for example 50% of original peak value).Processor 135 determines whether the SSCH processing finishes.If the SSCH processing finishes, then Cell searching finishes.Yet, if handling, do not finish SSCH, processor 135 forwards step 325 to, continues to use the early warning detector of PSCH subchannel as the change on the channel condition.
Yet, in step 330,, think that channel condition changes, thereby the SSCH processing of continuation stopped if the correlation peak that receives is less than or equal to predetermined threshold.Similarly, the SSCH of processor 135 pause steps 320 handles then, as what represented by halt signal 216 illustratives of Fig. 2.Processor 135 continues the illustrative steps 350,355 and 360 of Fig. 6 then.In step 350, processor 135 estimates to be used to measure the value that current SSCH handles the above-mentioned timer of consumption time.If the consumption time is less than or equal to predetermined threshold, that is, at " in early days " that SSCH handles, processor 135 restarts the Cell searching of Fig. 4 step 305.In this case, think that the SSCH processing does not also have enough data and comes the frame synchronization and the scrambler group of sub-district 15 are formed reliable judgement, and preferably restart Cell searching.The definition of " in early days " is for example to finish to be less than 50%SSCH and to handle, or or even finishes and be less than 75%.For example, if SSCH handle by pre-defined be 10ms for handling at least 10 radio frames, each frame, then the illustrative time value of using in step 350 can be 75ms.
On the other hand, if the consumption time greater than predetermined value,, think then that the SSCH that continues will use may insecure data damage current cumulative data promptly in " late period " that SSCH handles.Similarly, in step 355, processor 135 is checked the scrambler group that whether can estimate sub-district 15 according to current cumulative data.Particularly, in step 355, processor 135 determines whether there is coupling at 64 of the 15SSCH code of the 15SSCH code sequence that receives of current estimation and expression scrambler group between one of may sequences in conjunction with SSCH unit 210 via signaling 211.If there is coupling, thinks that then SSCH unit 210 correctly discerned the sequence that receives, and in step 360, finished frame synchronization and the scrambler group is determined.This coupling can or the accurate coupling on all 15SSCH codes, or the coupling (if unique scrambler group is discernible) of N at least in the 15SSCH code.N is the definition of illustrative ground, for example N=13.Yet, if there is no mating, processor 135 restarts the Cell searching of Fig. 4 step 305.
When in step 320 or step 360, completing successfully the SSCH processing, discerned the scrambler group of sub-district 15, make all other down channels that UE 20 can the descrambling sub-district (for example comprise Common Pilot Channel (CPICH), be used for Frequency Synchronization, also be used for determining the actual scrambler group of sub-district from the scrambler group of identification), and can begin voice/data communications.
As mentioned above, and according to principle of the present invention, the PSCH subchannel is used to monitor channel conditions during the processing of SSCH subchannel.Similarly, this method can be improved the performance that SSCH handles.Although describe in the context of initial cell search process, notion of the present invention is applicable to the arbitrary portion of handling the radio operation of down channel (for example SSCH subchannel) in having the variation channel condition.
Therefore only show principle of the present invention above, and can recognize, clearly do not illustrate, realize principle of the present invention and be in various optional setting in its spirit and scope although those skilled in the art can design at this.For example, although in the context of separate functional unit, illustrated, can realize these functional units at one or more integrated circuits (IC) and/or in one or more program stored processor controls (for example microprocessor or digital signal processor (DSP)).Similarly, although illustrate in the context based on the system of UMTS, the present invention is applicable in any communication system that has processing signals when changing channel condition.Therefore, be appreciated that and make various modifications to the embodiment that illustrates, and can design other setting, and do not break away from the defined spirit and scope of the invention of claims.
Claims (9)
1. method of using in wireless receiver comprises:
(a) handle first synchronizing channel of the wireless signal receive, to obtain slot synchronization; And
Still handling first synchronizing channel, handle SSC Secondary Synchronisation Code, to obtain frame synchronization with when the related data related with it is provided; And
If related data less than predetermined value, is then carried out following steps:
Suspend the processing of SSC Secondary Synchronisation Code, to obtain frame synchronization;
If the consumption time of the processing of SSC Secondary Synchronisation Code before being suspended was worth less than the scheduled time, from step (a); And
If the described consumption time is greater than predetermined value; According to the data of having accumulated, estimate the scrambler group that transmits in the SSC Secondary Synchronisation Code.
2. method according to claim 1, wherein, first synchronizing channel is the main synchronization suchannel (PSCH) of universal mobile telephone system (UMTS), and SSC Secondary Synchronisation Code is subsynchronous subchannel (SSCH).
3. method of in wireless receiver, using, the method comprising the steps of:
First synchronizing channel of the wireless signal that processing receives is to obtain frame synchronization; And
During the processing of first synchronizing channel, handle SSC Secondary Synchronisation Code, so that the related data related with it to be provided; And
If related data less than predetermined value, is then carried out following steps:
Suspend the processing of first synchronizing channel; And
If the consumption time that was used to handle first synchronizing channel before being suspended greater than predetermined value, according to the data of having accumulated, is estimated the scrambler group that transmits in first synchronizing channel; Otherwise, restart the processing of first synchronizing channel.
4. method according to claim 3, wherein, first synchronizing channel is the main synchronization suchannel (PSCH) of universal mobile telephone system (UMTS), and SSC Secondary Synchronisation Code is subsynchronous subchannel (SSCH).
5. wireless device comprises:
Front end (105) is used to receive wireless signal, and is used to provide the stream of the sampling that receives;
Main lock unit (205), the sampling that receives is operated, be used to provide the data that are used for obtaining to the slot synchronization of the master sync signal of the wireless signal that receives, and be used for after described slot synchronization, further handling master sync signal, so that continue to provide described data;
Subsynchronous unit (210) is operated the sampling that receives, and is used to obtain the frame synchronization to the subsynchronous signal of the wireless signal that receives;
Processor (135), the data that provided after described slot synchronization of autonomous lock unit are provided in response, as the function of the data that provided, suspend subsynchronous unit.
6. wireless device according to claim 5, wherein, after described slot synchronization, in the wireless signal that subsynchronous cell processing receives, main lock unit continues to handle the master sync signal of the wireless signal that receives.
7. wireless device according to claim 5, wherein, relevant between known main synchronizing code of the data representation that is provided and the master sync signal that receives, and if should be relevant less than predetermined value, described processor suspends subsynchronous unit.
8. wireless device according to claim 5, wherein, in case suspend, if the consumption time that before suspending, is used to obtain described frame synchronization greater than predetermined value, subsynchronous unit offers processor with the estimation of scrambler group.
9. wireless device according to claim 5, wherein, in case suspend, if the consumption time that before suspending, is used to obtain described frame synchronization less than predetermined value, processor restarts subsynchronous processor.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US2003/024351 WO2005018111A1 (en) | 2003-08-04 | 2003-08-04 | Frame synchronization in a universal mobile telephone system receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1820431A CN1820431A (en) | 2006-08-16 |
| CN1820431B true CN1820431B (en) | 2010-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN038268701A Expired - Fee Related CN1820431B (en) | 2003-08-04 | 2003-08-04 | Frame synchronization in universal mobile telephone system |
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| EP (1) | EP1652318A1 (en) |
| JP (1) | JP4317849B2 (en) |
| CN (1) | CN1820431B (en) |
| AU (1) | AU2003254311A1 (en) |
| WO (1) | WO2005018111A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101102150B (en) * | 2007-08-10 | 2013-03-20 | 中兴通讯股份有限公司 | Method for reducing adjacent area interference in wireless communication downlink synchronization channel |
| US20100003992A1 (en) * | 2008-07-01 | 2010-01-07 | Telefonaktiebolaget L M Ericsson (Publ) | Finding Hidden Cells in a Mobile Communication System |
| EP2965452B1 (en) | 2013-03-06 | 2018-08-08 | Telefonaktiebolaget LM Ericsson (publ) | Channel estimation for interference cancellation |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020044538A1 (en) * | 2000-09-09 | 2002-04-18 | Samsung Electronics Co., Ltd. | Apparatus and method for searching a base station in an asynchronous mobile communications system |
| CN1433171A (en) * | 2002-01-18 | 2003-07-30 | 华为技术有限公司 | Method of obtaining present access subzone main scramble in synchronous windeband CDMA system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7400654B2 (en) * | 2000-05-23 | 2008-07-15 | Siemens Aktiengesellschaft | Method for synchronizing a receiver with a transmitter |
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2003
- 2003-08-04 CN CN038268701A patent/CN1820431B/en not_active Expired - Fee Related
- 2003-08-04 AU AU2003254311A patent/AU2003254311A1/en not_active Abandoned
- 2003-08-04 EP EP03818208A patent/EP1652318A1/en not_active Withdrawn
- 2003-08-04 WO PCT/US2003/024351 patent/WO2005018111A1/en active Application Filing
- 2003-08-04 JP JP2005507875A patent/JP4317849B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020044538A1 (en) * | 2000-09-09 | 2002-04-18 | Samsung Electronics Co., Ltd. | Apparatus and method for searching a base station in an asynchronous mobile communications system |
| CN1433171A (en) * | 2002-01-18 | 2003-07-30 | 华为技术有限公司 | Method of obtaining present access subzone main scramble in synchronous windeband CDMA system |
Non-Patent Citations (1)
| Title |
|---|
| US6597681B! 2003.07.22 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4317849B2 (en) | 2009-08-19 |
| JP2007521678A (en) | 2007-08-02 |
| EP1652318A1 (en) | 2006-05-03 |
| CN1820431A (en) | 2006-08-16 |
| WO2005018111A1 (en) | 2005-02-24 |
| AU2003254311A1 (en) | 2005-03-07 |
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