Frame timing and identification of scrambling code in systems of wireless communication and methods for it

FIELD: information technologies.

SUBSTANCE: mobile device of wireless communication and methods for it include signal reception, saving of received signal part, identification of all possible pilot-signals by means of determination of information on slot border for saved part of signal, determination of information on frame border and/or information of scrambling code from saved part of signal by means of correlation of saved signal part with scrambling codes on the basis of information on slot border. In other versions of realisation searching is done in real time without signal saving.

EFFECT: increased probability of signal detection.

22 cl, 7 dwg

 

The technical field to which the invention relates

This disclosure generally relates to wireless communications, and more particularly to a framing and definition scrambling code in communication systems, multiple access, code division multiple access (CDMA), for example, in the 3rd generation (3G) Universal Mobile Telephone System (UMTS) communication systems, including mobile wireless communication devices, and methods for this.

The level of technology

In the third generation (3G) UMTS communication systems for the mobile stations or subscriber devices require considerable time to search for the adjacent pilot signals from the adjacent list information provided by the base stations of the network in the system information broadcast or similar message.

Now when you search the adjacent pilot signals procedure framing UMTS and identification scrambling code are running on separate stages of signal processing, which generally require operation of the RF receiver (RF) for extended periods of time, including operation during standby mode, in which there is negligible battery drain.

Phase 1 signal processing define the boundaries of the slot of the primary sync channel (PSCH) adopted by neighboring signals. Subsequently, in stage 2 of the processing carried out is Aut personnel synchronization by correlation of multiple slots of the secondary sync channel (SSCH) with each of the 16 secondary synchronization codes (SSC), thus, allowing you to define the border of the frame (frame) and to identify a group code, which can be determined corresponding set scramblers codes. In theory assumes no interference or attenuation, timesync requires correlation with more than 3 slots, but in practice, the correlation can be performed with 15 or more slots. Frame synchronization must be performed for each boundary of the slot identified in the stage 1 processing. For stage 3 processing, the selection of the base station based on scramblers codes identified in step 2.

The current procedure frame synchronization produces a lot of false positives and has a low probability of detection, to some extent because the channel SSCH is a weak signal. In addition, because the channel SSCH can be correlated only to 256 chips per slot, it is usually necessary correlation with the number of slots, thus prolonging the time during which it must operate radio frequency RF receiver. Thus, the existing process of framing is relatively inefficient, especially during the standby mode, when the RF receiver RF under other circumstances would have been disabled.

Various aspects, features and advantages of the disclosure will become more apparent specifications the sheets in the art after a careful consideration of the following detailed disclosure and the accompanying drawings, described below.

Brief description of drawings

Figure 1 represents a typical communication system includes network infrastructure and the subscriber's device.

Figure 2 is a block diagram of the algorithm is a typical process of framing.

Figure 3 illustrates a radio frame and a time slot access physical channels descending line radio.

Figure 4 is a schematic image of the boundary of the slot and information scrambling code.

Figure 5 is a partial schematic block diagram of a radio frequency (RF) receiver and a signal processing circuit.

6 is a partial schematic block diagram of a device search signal.

7 is a block diagram of an alternative process of framing.

Detailed description

The disclosure relates in General to a method for frame synchronization and identification scrambling code in a mobile wireless communications devices operating in the communication systems, spread spectrum, such as mobile subscriber communicates in CDMA networks.

Figure 1 illustrates a system 100 for wireless communication includes a CDMA cellular network, for example communication system of the 3rd generation (3G) Universal Mobile Telephone System (UMTS). The network includes mn is the number of transceivers 110 of base stations, with appropriate overlapping cell area to support communication with the mobile wireless communications devices of the subscriber or user equipment 120 (UE) in the network. The communications network also includes other network infrastructure, known to experts in the art, is schematically depicted in figure 1 in block 130.

Figure 1 is a mobile device of the subscriber, such as UE 120, a network communication receive information of the pilot channel and the sync channel from each of the neighboring transceivers 110 base stations. Each base station has a unique pilot signal, which can be distinguished from other pilot signals through its scrambling code, such as long scramblase code. The subscriber's device should, in General, to identify pilot signals of neighboring base stations that are used by the subscriber's device to identify the presence of a network system for detection, demodulation synchronization channel, search call and traffic, as well as for transmission service.

The disclosure generally relates to methods for determining information about the frame's border and/or identification of long scrambling code associated with a particular cell by cell. These and other aspects of the disclosure are discussed in more detail below.

The device of the subscriber with an extended range,for example UMTS UE, in General capable of forming information scrambling code, or information scrambling code is stored in them; for frame synchronization, as is known, in General, specialists in this art. Information scrambling code corresponds to, for example, long scramblers codes associated with the respective neighboring cell by cell. In the UMTS network device of the subscriber is provided with information of the neighboring cell of the cell in the list provided in the System Information Block (SIB) broadcast channel (BCH).

In some networks, the operators of arbitrarily provide information difference anchor points of the time reference point (RTD) between the Common Pilot Channels (CPICH) of the neighboring cell and the serving cell by cell. This information can be represented, for example, in the System Information Block broadcast Channel in communication systems UMTS. Information (RTD) can be useful for extending the battery life of devices of the subscriber. Thus, in General, during the framing information framing may or may not be known to the subscriber's device.

Figure 2 is a block diagram 200 of the algorithm is a typical process for framing the neighboring cell of the cell device of the subscriber. In figure 2, in block 210, the device Abona is that receives signals from neighboring base stations. Figure 3 illustrates a typical timing information of the radio frame and the typical timing information of slot access physical channels downlink transmitted from the typical network UMTS base stations. The UMTS signal has a 10-MS structure frame. Each frame includes 15 slots, designated as Slot 0 Slot 14 figure 3. A typical UMTS signal includes a Primary Sync Channel (PSCH), the Secondary Sync Channel (SSCH), Common Pilot Channel (CPICH) and a Dedicated channel (DCH), each of which is schematically shown in figure 3.

Figure 2 in block 220, the subscriber device determines the information about the boundary of the slot of the received signal. Information about the boundary of the slot generally includes identifying at least one border of the slot, but in most cases identified many of the boundaries of the slot. Information about the boundary of the slot is essentially an information synchronization. Each neighboring cell of the cell as a whole has a corresponding boundary of the slot, while the effects of multipath propagation can produce many borders slots for a single cell of the cell. Information about the boundary of the slot of the neighboring cell may not be present, due to the fact that the corresponding signal level is below a predetermined threshold. In one mode of operation, information about the boundary of the slot is determined from the Main Channel Sync the organization (PSCH) of received signals of the neighboring cell of the cell for example, by means of normal phase 1 signal processing.

Figure 4 illustrates the boundaries of the slot identified in phase 1 signal processing. At least one and generally several slot boundaries are identified for each slot. Figure 4 group boundaries slot for each slot are identified as 410, 420... etc. for slot 0, slot 1... slot 14, respectively. In General, the amplitude of the signal corresponding to the boundaries of the slot varies depending on the signal level, and only those that have amplitudes above the threshold are considered for the border of the frame and/or determine scrambling code. Figure 4 each boundary of the slot corresponds in General, the neighboring cell of the cell and has a corresponding time offset based on its position along the time axis.

Figure 5 is a partial schematic block diagram of the receiver (RF) mobile communication device and the circuit 500 of signal processing, which includes the whole circuit 510 conversion with decreasing radio frequency to provide signals to baseband frequency search unit 520 and the processor 530 baseband frequencies. Conversion scheme with decreasing frequency is connected with the antenna 540 through schemes filtering and analog-to-digital Converter, which are widely known but not illustrated. 6 is a schematic block the diagram of a typical circuit 600 retrieval device, containing in the whole cascade 1 search device 610 to perform phase 1 of the signal processing described above.

Figure 2 in block 230 determines information about the frame's border and/or specific scramblase code by correlating the signal with information scrambling code based on the boundary information of the slot is determined in block 220. Specific scramblase code - for example, associated with specific appropriate cell by cell.

The process of correlation occurs through negotiation information scrambling code relative to the received signal on the basis of the boundary information of the slot before the correlation signal and scramblers codes. More detail information about the boundary of the slot includes information offset time, which is used to match scramblers codes relative to the received signal or part of a process of correlation, as discussed in more detail below. For each boundary of the slot, the correlation between the received signal and scramblers code runs in each of several possible boundaries of the frame.

Figure 4 is a schematic illustration of a typical process of correlation. For each boundary of the slot scramblers codes of the neighboring cell of the cell codes 1-N, each of which is consistent and correlated with the received signal is crimson in each of several possible boundaries of the frame to determine the desired information about the frame's border and/or to identify specific scrambling code. Figure 4 for each boundary of the slot, the correlation between the received signal and scramblers code runs in each of the fifteen (15) possible boundaries of the frame. No need to use or to first determine information about the frame's border and/or information group scrambling code to determine scramblers codes. The correlation process results in essentially simultaneously to the information about the frame's border and to information specific scrambling code.

Figure 6 cascade 1 search device provides information about the boundary of the slot defined during phase 1 processing, the controller 620. The controller provides information scrambling code, such as long scramblers codes generated by the generator 630 code in the scheme correlator 640 on the basis of the boundary information of the slot defined by cascade 1 search device, as described above. Diagram of the correlator 640 determines information about the frame's border and/or information scrambling code through correlation of a received signal and scramblers codes, as described above. As noted, scramblers codes can be identified without using the information about the frame's border or information group scramblers codes.

In one embodiment, information scrambling code correlates with a continuous signal is scrap. In a typical embodiment, UMTS information scrambling code correlates with a Common Pilot Channel (CPICH), is shown in figure 3, although other signals may be used in other variants of the implementation.

In some modes of operation, the subscriber's device stores a portion of the received signal, for example a part of the Common Pilot Channel (CPICH), and then disables the RF receiver, after which the correlation is performed using the stored part of the signal without continue receiving device.

6 illustrates the input buffer 650 for storing the received portion of the signal that is provided to the scheme correlator to correlate with skremblirovanie codes. In the schematic representation of Figure 5, the RF receiver is blocked when the actuation of the switch by the search device 520 after receiving and saving part of the signal in the buffer. Figure 6 controller 620 disables receiver RF.

In some embodiments, the implementation information for less than one full frame, for example, less than one in 10-MS frame of a typical UMTS signal, is shown in figure 3, is stored in the buffer. In one embodiment, information for a specific slot or not significantly more than for a single slot frame stored in the buffer. In other embodiments, implementation of the saved portion of the received signal R is t the information indicating the search call to the subscriber device, making the search for pilot signals.

In the block diagram 700 of the process of framing Fig.7. the signal is received in block 710 and the phase 1 boundary information of the slot is determined in block 720. In block 730 part of the received signal, for example a continuous signal is a Common Pilot Channel (CPICH)is stored into memory for subsequent correlation with skremblirovanie codes. In some embodiments, the implementation of information less than one complete frame is stored in the buffer, and in other embodiments, the implementation information for a specific slot is stored in the buffer. Information about the boundary of the slot can be obtained from the preserved parts of the signal, although in other embodiments, the exercise of defining the boundaries of the slot during phase 1 is to save part of the signal or partially simultaneously with the save operation signal.

In some embodiments, the implementation of the stored portion of the signal includes information search call to the subscriber device, thus eliminating the need to re-enable the receiver to obtain information indicating the search call.

In block 740 in some embodiments, the implementation after the save part of the radio signal-circuits are disabled, thereby reducing unnecessary power consumption associated with the operation of the RF receiver during the process of correlation. Definition detail is provided on the frame's border and/or information specific scrambling code is performed by correlation saved part of the signal with skremblirovanie codes in block 750, as described above, while the radio circuit is disabled.

If after determining the boundary information of the slot during normal stage 1 processing signals, the information signal is not significantly greater than for a single slot is captured or stored in the buffer, the time on the radio circuit can be reduced on the order of 10 MS (required for normal stage 2 and stage 3 processing) to less than 1 MS when using the synchronization process described above, substantially reducing battery drain.

7 in block 760 for each correlation, it is preferable to integrate the correlated information up until you are defining the border of the frame and/or information scrambling code. In a typical application synchronization UMTS correlation common pilot channel, CPICH, with skremblirovanie codes allows the integration.

While this is considered a disclosure, which is the best mode of the invention, described in a way that defines the objects for the protection of inventors and that enables professionals in the art to make and use the invention, will be understood and appreciated that there are many equivalents of typical variants of implementation revealed here, and that numerous modifications and changes may be made to, without departing from the scope and essence of izaberete is s, which should not be limited to typical choices, but in accordance with the attached claims.

1. The method of frame synchronization and identification scrambling code in wireless communication, namely, that
take the alarm;
specify the information about the boundary of the slot signal;
specify the information about the border frame signal by correlating the signal with multiple skremblirovanie codes on the basis of the boundary information of the slot;
identify specific scramblase code at the same time, determine when the information about the frame's border.

2. The method according to claim 1, in which the correlation of the signal with skremblirovanie codes on the basis of the boundary information of the slot includes a stage on which coordinate scramblers codes relative to the signal on the basis of the boundary information of the slot before the correlation of the signal with the scrambling codes.

3. The method according to claim 2, in which the correlated signal with skremblirovanie codes in each of several possible boundaries of the frame.

4. The method according to claim 1, wherein the signal is a continuous signal, with correlated continuous signal with each of scramblers codes.

5. The method according to claim 1, wherein the signal is a common pilot channel, thus correlate the common pilot channel from each of the IC is emborough codes.

6. The method according to claim 1, in which
information about the boundary of the slot includes information offset time;
correlate the signal with skremblirovanie codes on the basis of the information of the offset time.

7. The method according to claim 1, in which for each correlation integrate up until you want the definition of the information about the frame's border.

8. The method of frame synchronization and identification scrambling code in wireless communication, namely, that
take the alarm;
retain part of the signal;
specify the information about the boundary of the slot saved part of the signal;
specify the information about the border frame stored part of the signal by correlation of the stored part of the signal with many scramblers codes on the basis of the boundary information of the slot;
identify specific scramblase code at the same time, determine when the information about the frame's border.

9. The method according to claim 8, in which
determining boundary information of the slot includes a stage at which identify many of the boundaries of the slot,
thus correlate the stored portion of the signal with many scramblers codes in each set of the boundaries of the slot.

10. The method according to claim 8, in which the signal structure frames, retain part of the signal by storing less than a frame.

11. The method is about 8, in which
the correlation of the signal with skremblirovanie codes on the basis of the boundary information of the slot includes a stage on which coordinate scramblers codes relative to the signal on the basis of the boundary information of the slot before the correlation of the signal with skremblirovanie codes.

12. The method according to claim 8, in which the signal is a continuous signal, with correlated continuous signal with each of scramblers codes.

13. The method according to claim 8, in which the signal is a common pilot channel, thus correlate the common pilot channel from each of scramblers codes.

14. The method according to claim 8, in which turn off the radio of the wireless device after storing the portion of the signal.

15. The method according to claim 8, in which store information indicating a search call to the wireless device when the retain part of the signal.

16. The method according to claim 8, in which identify specific scramblase code by correlating the signal with skremblirovanie codes on the basis of the boundary information of the slot.

17. The method of frame synchronization and identification scrambling code in wireless communication, namely, that
take the alarm;
determine at least one edge of the slot signal;
identify specific scramblase code associated with, less is th least one boundary of the slot, through the correlation of a signal with many scramblers codes based on at least one border of the slot without using information of the group scramblers codes.

18. The method of determining the boundaries of the slot and identification scrambling code in wireless communication, namely, that receive signals;
determine at least one edge of the slot signal;
identify specific scramblase code associated with at least one boundary of the slot, through the correlation of a signal with many scramblers codes based on at least one border of the slot without using the information about the frame's border.

19. The method according to p, which specify the information about the frame's border at the same time identify specific scramblase code.

20. The method according to p, in which for each correlation integrate up until you want to identify specific scramblase code.

21. The method according to p, in which
retain a portion of a received signal;
identify specific scramblase code through correlation saved part of the signal with many scramblers codes based on at least one boundary of the slot without using the information about the frame's border.

22. The method according to item 21, which is off the Ute radio wireless communication devices after storing the portion of the signal.



 

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