CN103716862A - User equipment, chip and initial unit searching method - Google Patents
User equipment, chip and initial unit searching method Download PDFInfo
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- CN103716862A CN103716862A CN201310291448.9A CN201310291448A CN103716862A CN 103716862 A CN103716862 A CN 103716862A CN 201310291448 A CN201310291448 A CN 201310291448A CN 103716862 A CN103716862 A CN 103716862A
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- initial cell
- subscriber equipment
- synchrodata
- cell search
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
- H04J11/0089—Search hardware arrangements, e.g. sharing of correlators to reduce complexity
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- Synchronisation In Digital Transmission Systems (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention provides user equipment (UE). The user equipment comprises a radio-frequency front end which is used for rebuilding synchronization data based on a radio-frequency signal received by the user equipment. The user equipment further comprises a hardware controller coupled to the radio-frequency front end and used for storing the synchronization data rebuilt by the radio-frequency front end into a memory of the user equipment, and then abstracting the synchronization data from the memory; and an initial unit searching module coupled to the hardware controller, and used for performing an off-line initial unit searching test using the synchronization data abstracted by the hardware controller from the memory. The invention further provides a chip and an initial unit searching method.
Description
Technical field
The present invention relates to mobile communication technology, special, relate to the initial cell searching method of mobile communication and subscriber equipment and the chip of use the method.
Background technology
Before setting up network connection, the subscriber equipment that is arranged in a mobile communications network (is called for short UE, a mobile phone for example) need first carry out initial cell search (initial cell search, be called for short ICS) flow process, with judge which unit in a plurality of adjacent cells carry out resident and how with this unit communication.
In general, subscriber equipment has crystal oscillator, in order to as a local oscillator (LO) to produce local oscillator (LO) signal.Radio frequency (RF) signal down that described LO signal receives subscriber equipment is to base band domain.Then, the signal after this frequency reducing is directly carried out to ICS flow process.Yet because this crystal oscillator may be inaccurate, so subscriber equipment need to be processed the frequency offset issues being caused by this inaccurate LO signal in ICS process.Yet this may extend the acquisition time of ICS flow process.
Except the frequency offset issues associated with crystal oscillator, the conventional method of this ICS flow process may also can face other problems, for example longer acquisition time and too much power consumption.
Summary of the invention
In view of this, be necessary to provide the initial cell searching method of a kind of subscriber equipment, chip and execution thereof, to solve the technical problem.
One of the present invention embodiment provides a kind of subscriber equipment, and it has a radio-frequency front-end, and this radio-frequency front-end re-creates synchrodata in order to the radiofrequency signal receiving based on this subscriber equipment.This subscriber equipment further comprises: a hardware control, be coupled to this radio-frequency front-end, and for the synchrodata that radio-frequency front-end is re-created, dump to a memory of this subscriber equipment, and then from this synchrodata of this memory fetch; And an initial cell search module, be coupled to this hardware control, for using by this hardware control, from the synchronizing signal of this memory fetch, carry out an off-line initial cell search test.
Another embodiment of the present invention provides a kind of chip, is arranged in a subscriber equipment.This chip comprises: a hardware control, for the synchrodata being re-created by this subscriber equipment is dumped to an external memory storage of this subscriber equipment by an external memory interface of this chip, and then pass through this external memory interface from this synchrodata of this memory fetch; And an initial cell search module, be coupled to this hardware control, for using by this hardware control, from the synchronizing signal of this memory fetch, carry out an initial cell search test.
Further embodiment of this invention provides a kind of initial cell searching method, and it has the step that the radiofrequency signal receiving based on a subscriber equipment re-creates synchrodata.The method further comprises: a memory that the synchrodata re-creating is dumped to this subscriber equipment; From this synchrodata of this memory fetch; And use this extracted synchronizing signal to carry out an initial cell search test.
The above embodiments make the acquisition time of this subscriber equipment cost less in initial cell search routine and consume power still less.In addition, the present embodiment makes this subscriber equipment at numeric field, process easily the problem of frequency shift (FS) and time drift, and without excessively increasing acquisition time or the power consumption of subscriber equipment.And above-described embodiment can be realized on the basis of the additional hardware cost that does not have or need to be minimum.
Accompanying drawing explanation
Fig. 1 is that an embodiment is for the schematic diagram of the synchronization frame of a third generation (3G) mobile communications network;
Fig. 2 is the simplified block diagram of the subscriber equipment that provides of one embodiment of the invention; And
Fig. 3 is the simplified flow chart by the initial cell searching method of the subscriber equipment execution of Fig. 2.
Embodiment
For the present invention's described object, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and coordinate appended graphicly, be described in detail below.
In mobile communications network, each unit can be broadcasted one by one to a plurality of synchronization frames, to help contiguous subscriber equipment to carry out initial cell search (initial cell search is called for short ICS) flow process.From the angle of subscriber equipment, the synchronization frame of being broadcasted by adjacent unit may overlap each other in time domain.In ICS flow process, subscriber equipment can with overlapping synchronization frame determine which unit resident and how with this unit communication.
Fig. 1 is that an embodiment is for the schematic diagram of the synchronization frame of a third generation (3G) mobile communications network.As shown in the drawing, this synchronization frame is used three synchronizing channels, comprises a primary synchronization channel (PSCH), an auxiliary synchronization channel (SSCH) and a common pilot channel (CPICH).This synchronization frame is divided into 15 time slots.In PSCH, in the beginning of each time slot broadcast sequence, and described 15 the PSCH sequences in this synchronization frame are all identical, their subscriber equipment of activation (referring to Fig. 2) is to carry out slot synchronization, and the execution of described slot synchronization is defined as the 1st stage of ICS flow process.In SSCH, in the beginning of each time slot broadcast sequence, and described 15 the SSCH sequences in this synchronization frame are different, and they make subscriber equipment carry out frame synchronization and code group identification, and this is defined as the 2nd stage of ICS flow process.By each of described 15 time slots is divided into 10 symbols, described CPICH can carry down link (downlink) the common pilot symbol that is carried out scramble by a specific scramble codes.Described downlink shared frequency pilot sign makes subscriber equipment carry out scrambler identification, and this is defined as the 3rd stage of ICS flow process.The ICS flow process of 4G mobile communication standard (being 4G, LTE) also has and is similar to three phases above-mentioned.
Fig. 2 is the simplified block diagram of this subscriber equipment of providing of one embodiment of the invention.This figure has only described the functional block relevant to essence of the present invention, for simplicity, for the module of other function, is omitted.This subscriber equipment 200 can compatible 3G and/or 4G mobile communication standard.
In the present embodiment, this subscriber equipment 200 comprises a radio-frequency front-end (radio frequency front end is called for short RF FE) 210, one hardware (HW) controller 220, an ICS module 230 and a memory 240.This memory 240 is not the internal storage that comprises a chip 215 of this HW controller 220 and this ICS module 230, but be external in chip 215, also by an external memory interface (EMI) 225 of chip 215, is connected to chip 215.This memory interface 225 is external interfaces, because it is not built in this chip 215.By this hardware control 220 and EMI225, this chip 215 can utilize the memory space being provided by memory 240 to carry out access.Although Fig. 2 otherwise illustrates, described RF FE210 can be still a part for chip 215.As for RF FE210, it is responsible for the RF signal down of the antenna reception by subscriber equipment 200 to base band domain.In order to process frequency reducing, described RF FE210 can comprise the element such as filter, low noise amplifier (LNA), local oscillator (LO) and a down mixer.
Fig. 3 shows the simplified flow chart of the method for being carried out by subscriber equipment 200.This figure has only described the step relevant with essence of the present invention, for simplicity, omits other step.First, in step 310, subscriber equipment 200 re-creates synchrodata and synchrodata is dumped to memory 240, with activation off-line ICS subsequently.Particularly, this RF FE210 by by the RF signal down being received in this synchronizing channel by antenna to base band domain, and re-create this synchrodata.This hardware control 220 dumps to memory 240 by the synchrodata receiving from this RF FE210.
This synchrodata can comprise the information in synchronization frame, and some units synchronization that wherein this synchronization frame is close to by subscriber equipment 200 are broadcasted.For example, if this subscriber equipment 200 is 3G subscription ends, each synchronization frame can have the structure shown in Fig. 1.Step 310 may need long enough, so that subscriber equipment 200 has enough high-quality synchrodatas described in can detecting.
In step 310, this hardware control 220 can provide this synchrodata to this ICS module 230 simultaneously, for some real-time ICS test.Yet because step 310 may only continue very short a period of time, this ICS module 230 possibly cannot be successfully completed an ICS test in step 310.After step 310, this subscriber equipment 200 can cut out this RF FE210 to reduce power consumption.
One ICS test is that an ICS who is carried out by ICS module 230 attempts.Take 3G standard as example, and this ICS test comprises the 1st above-mentioned stage, the 2nd stage and the 3rd stage.If this test is series of experiments, only there is one in this three phases to carry out work at every turn.Or if this test is the test of a streamline (pipeline), this three phases can be carried out simultaneously.In general, campaign may cause take to have more low-power consumption compared with long search time as cost.In contrast, the test of streamline may cause take higher power dissipation to use shorter search time as cost.
In step 320, this subscriber equipment 200 determines whether this ICS module 230 needs to continue to carry out ICS test.If answer is sure, subscriber equipment 200 enters step 330, otherwise subscriber equipment 200 enters step 340.For example, if cannot this ICS flow process of premature termination or also do not complete all tests, subscriber equipment 200 may need to continue to carry out an ICS test.If this ICS module 230 is not carried out real-time ICS test in step 310, subscriber equipment 200 may be walked around step 320, and directly enters step 330 after leaving step 310.
In step 330, subscriber equipment 200 uses the synchrodata extracting from memory 240, with off-line execution ICS, tests.Particularly, this hardware control 220 extracts this synchrodata from memory 240, and provides this synchrodata to this ICS module 230.This ICS module 230 is used this synchrodata to carry out off-line ICS test.This test is a kind of off-line testing, and this is because of this synchrodata non-real-time data (that is to say, broadcast the unit that does not have data to be close to) simultaneously, but some new datas of previously having been broadcasted by the unit being close to.This ICS module 230 can be carried out the test of ICS campaign or streamline in step 330.
As shown in Figure 3, step 320 and 330 forms an iterative cycles, and it can be repeated multiple times, until do not have other ICS test to need to continue to carry out.So the reusable identical segment sync data of this ICS module 230 (taking out from memory 240) are to carry out a plurality of ICS tests.
In ICS flow process, some reasons except ICS, subscriber equipment 200 probably need to be in memory 240 the too many memory space of access.In other words, memory 240 can have enough bandwidth (bandwidth) for ICS flow process.So this subscriber equipment 200 can have enough bandwidth of memory 240 and lay in ICS program.In other words, in step 310 and 330, will there be enough memory bandwidths to make hardware control 220 that this synchrodata is dumped to memory 240, and therefrom extract this synchrodata again.This use of memory 240 can not exhaust all available bandwidth.In addition, due to the object except ICS, memory 240 may be a necessary element of subscriber equipment 200, makes subscriber equipment 200 in the situation that not having or needing outside jot hardware cost, to use this memory 240 in ICS flow process.
The local oscillator of this RF FE210 can have a crystal oscillator, and for generation of a local oscillator (LO) signal, the RF signal down that is used for subscriber equipment 200 to receive is to base band domain.Because this crystal oscillator may be inaccurate, described synchrodata may have intrinsic base band frequency skew and/or time drift.Therefore,, carry out ICS test in step 330 before, this ICS module 230 can be carried out base band frequency displacement to this synchrodata in digitlization ground, and/or regularly compensation is carried out to this synchrodata in digitlization ground.Because these operations are all to carry out at numeric field, and be to carry out for the synchrodata of unloading, so they can not cause too large delay to ICS flow process.
In step 340, this subscriber equipment 200 determines whether it can complete this ICS flow process.If answer negates, this subscriber equipment 200 turns back to step 310, and so that ICS flow process is restarted one time, otherwise this subscriber equipment 200 enters into step 350.For example, if this subscriber equipment 200 has obtained a best frequency deviation (maximum bin), and the value of this best frequency deviation is better than predetermined threshold, and this subscriber equipment 200 can enter step 350.
In step 350, this subscriber equipment 200 completes this ICS flow process and a selected unit is carried out resident.Particularly, once successfully after ICS test and before resident this selected unit of reality, this subscriber equipment 200 may need to carry out certain operations.3G may carry out the different operation of many groups with 4G network in step 350.
In a word, the above embodiments make the acquisition time of this subscriber equipment 200 cost less in ICS flow process and consume power still less.In addition, the present embodiment makes this subscriber equipment 200 at numeric field, process easily the problem of frequency shift (FS) and time drift, and without excessively increasing acquisition time or the power consumption of subscriber equipment 200.And above-described embodiment can be realized on the basis of the additional hardware cost that does not have or need to be minimum.
In detailed above description, the specific embodiment of describing by reference to the present invention, it will be appreciated by persons skilled in the art that in the situation that not deviating from spirit of the present invention and can make various modifications.And above detailed description and accompanying drawing should described in be interpreted as it is in order clearly to set forth invention, rather than as restriction of the present invention.
Claims (13)
1. a subscriber equipment, it has a radio-frequency front-end, and this radio-frequency front-end re-creates synchrodata in order to the radiofrequency signal receiving based on this subscriber equipment, it is characterized in that, and this subscriber equipment further comprises:
One hardware control, is coupled to this radio-frequency front-end, dumps to a memory of this subscriber equipment for the synchrodata that radio-frequency front-end is re-created, and then from this synchrodata of this memory fetch; And
One initial cell search module, is coupled to this hardware control, for using by this hardware control, from the synchronizing signal of this memory fetch, carries out an off-line initial cell search test.
2. subscriber equipment as claimed in claim 1, is characterized in that, this initial cell search module is further used for reusing by this hardware control from the synchrodata of memory fetch to carry out a plurality of initial cell search tests.
3. subscriber equipment as claimed in claim 1, is characterized in that, this initial cell search module was further used for before carrying out this initial cell search test, and base band frequency displacement is carried out to this synchrodata in digitlization ground.
4. subscriber equipment as claimed in claim 1, is characterized in that, this initial cell search module was further used for before carrying out this initial cell search test, the time drift of this synchrodata of digitlization ground compensation.
5. subscriber equipment as claimed in claim 1, is characterized in that, this memory is external memory storage, and this hardware control is couple to this memory by an external memory interface.
6. a chip, is arranged in a subscriber equipment, and this chip comprises:
One hardware control, for the synchrodata being re-created by this subscriber equipment is dumped to an external memory storage of this subscriber equipment by an external memory interface of this chip, and then passes through this external memory interface from this synchrodata of this memory fetch; And
One initial cell search module, is coupled to this hardware control, for using by this hardware control, from the synchronizing signal of this memory fetch, carries out an off-line initial cell search test.
7. chip as claimed in claim 6, is characterized in that, this initial cell search module is further used for reusing by this hardware control from the synchrodata of memory fetch to carry out a plurality of initial cell search tests.
8. chip as claimed in claim 6, is characterized in that, this initial cell search module was further used for before carrying out this initial cell search test, and base band frequency displacement is carried out to this synchrodata in digitlization ground.
9. chip as claimed in claim 6, is characterized in that, this initial cell search module was further used for before carrying out this initial cell search test, the time drift of this synchrodata of digitlization ground compensation.
10. an initial cell searching method, has the step that the radiofrequency signal receiving based on a subscriber equipment re-creates synchrodata, it is characterized in that, the method further comprises:
The synchrodata re-creating is dumped to a memory of this subscriber equipment;
From this synchrodata of this memory fetch; And
By this extracted synchronizing signal, carry out an initial cell search test.
11. initial cell searching methods as claimed in claim 10, is characterized in that, further comprise: reuse this extracted synchrodata and carry out a plurality of initial cell search tests.
12. initial cell searching methods as claimed in claim 10, is characterized in that, further comprise: before carrying out this initial cell search test, base band frequency displacement is carried out to this synchrodata in digitlization ground.
13. initial cell searching methods as claimed in claim 10, is characterized in that, further comprise: before carrying out this initial cell search test, and the time drift of this synchrodata of digitlization ground compensation.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102012015943.9 | 2012-08-10 | ||
| DE102012015943.9A DE102012015943B4 (en) | 2012-08-10 | 2012-08-10 | Initial cell search method and corresponding user device and corresponding chip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103716862A true CN103716862A (en) | 2014-04-09 |
| CN103716862B CN103716862B (en) | 2017-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310291448.9A Active CN103716862B (en) | 2012-08-10 | 2013-07-11 | user equipment, chip and its initial cell search method |
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| CN (1) | CN103716862B (en) |
| DE (1) | DE102012015943B4 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3843040B2 (en) * | 2001-09-26 | 2006-11-08 | 松下電器産業株式会社 | Cell search method and communication terminal device |
| WO2003063538A1 (en) * | 2002-01-21 | 2003-07-31 | Siemens Mobile Communications S.P.A. | Method and mobile station to perform the initial cell search in time slotted systems |
| KR100594597B1 (en) * | 2003-10-24 | 2006-06-30 | 한국전자통신연구원 | Method and apparatus for embodying downlink signal in mobile communication system, and method and apparatus for synchronizing and searching cell using the same |
| KR100594146B1 (en) * | 2004-02-11 | 2006-06-28 | 삼성전자주식회사 | Apparatus and method for initial frequency offset estimation in asynchronous mobile communication system |
| US7835327B2 (en) * | 2007-08-01 | 2010-11-16 | Broadcom Corporation | Multiple antenna servicing by multibranch PSYNC detection module |
| US9426685B2 (en) * | 2010-07-16 | 2016-08-23 | Broadcom Corporation | Method and system for mitigation of unlisted cell impacts in idle mode of cellular systems |
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2012
- 2012-08-10 DE DE102012015943.9A patent/DE102012015943B4/en active Active
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| Publication number | Publication date |
|---|---|
| CN103716862B (en) | 2017-03-01 |
| DE102012015943A1 (en) | 2014-05-15 |
| DE102012015943B4 (en) | 2017-09-07 |
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