CN105828363B - Method and device for aligning time slots of narrow-band wireless digital communication - Google Patents
Method and device for aligning time slots of narrow-band wireless digital communication Download PDFInfo
- Publication number
- CN105828363B CN105828363B CN201610194556.8A CN201610194556A CN105828363B CN 105828363 B CN105828363 B CN 105828363B CN 201610194556 A CN201610194556 A CN 201610194556A CN 105828363 B CN105828363 B CN 105828363B
- Authority
- CN
- China
- Prior art keywords
- time slot
- sequence
- preset sequence
- syndrome
- preset
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention relates to a method and a device for aligning time slots of narrowband wireless digital communication, wherein the method comprises the following steps: receiving a plurality of access channel type bits by a plurality of continuous downlink time slots, and forming a time slot value sequence by the plurality of access channel type bits according to a receiving sequence; setting a first preset sequence and a second preset sequence, wherein a downlink time slot aligned with the first preset sequence is a first time slot, and a downlink time slot aligned with the second preset sequence is a second time slot; and comparing the time slot value sequence with the first preset sequence and the second preset sequence respectively to obtain a first syndrome and a second syndrome, setting the current downlink time slot as the first time slot when the weight of the first syndrome is less than that of the second syndrome, and setting the current downlink time slot as the second time slot when the weight of the first syndrome is greater than that of the second syndrome. The time slot alignment method and the time slot alignment device respectively compare the time slot value sequence with the first preset sequence and the second preset sequence to judge the time slot aligned with the downlink time slot, and effectively improve the accuracy of time slot alignment.
Description
Technical Field
The invention relates to the technical field of narrow-band wireless digital communication, in particular to a method and a device for aligning time slots of narrow-band wireless digital communication.
Background
In a DMR (Digital Mobile Radio)/PDT (Digital trunked) Digital Mobile communication system, a TDMA (Time division multiple access) scheme of two slots and an FDMA (frequency division multiple access) technique of 12.5kHz Radio carrier bandwidth are used. Since two time slots are used, the alignment of the time slots is very important to avoid the interference between the two time slots.
In digital communication, uplink refers to transmission of signals from a mobile station to a base station, and downlink refers to transmission of signals from a base station to a mobile station. The timing relationship of the uplink and downlink time slots may be either time aligned (aligned channels) or non-aligned (offset channels). For the aligned channel, as shown in fig. 1, the uplink channel and the downlink channel are divided into two time slots of logical channels by means of TDMA: logical channel 1 and logical channel 2. Thus, when the base station channel timing is aligned, on logical channel 1, the mobile station receives signals on downlink time slot 1 and transmits signals on uplink time slot 2. On logical channel 2, the mobile station receives signals on downlink time slot 2 and transmits signals on uplink time slot 1.
The alignment of the uplink and downlink slots is achieved by CACH (common broadcast channel) of the downlink slots, each common broadcast channel burst indicating the slot number of the next downlink burst and the uplink burst delayed by one slot. In 24 bits of each CACH burst, 4 message bits and 3 parity bits are included to determine a frame and a state, these bits are called time division multiple access channel type (TACT) bits, the TACT includes a TC (time slot value) of one bit, where a TC of 1 indicates that the present downlink time slot is time slot 2, and a TC of 0 indicates that the present downlink time slot is time slot 1. The TC carries out encryption protection when in sending, and the mobile station can correctly decode the value of the TC through decoding under the condition that the signal quality is good enough; if a plurality of CACHs are received consecutively, and thus a plurality of consecutive TC values are obtained, it is possible to align the downlink slot 2 or the downlink slot 1 by the consecutive TC values. However, if the signal quality is poor, the TC value decoded by the code is not necessarily completely correct, and there is a possibility that the uplink timeslot is aligned with the downlink timeslot and then aligned with another timeslot.
Disclosure of Invention
Therefore, it is necessary to provide a method for effectively avoiding the slot value error and effectively improving the accuracy of slot alignment, aiming at the defect that the slot value error obtained by decoding is easily caused by poor signal quality in the existing narrow-band wireless digital communication, which causes the unaligned uplink and downlink slots.
A method for timeslot alignment for narrowband wireless digital communication, comprising:
receiving a plurality of access channel type bits by a plurality of continuous downlink time slots, and forming a time slot value sequence by the plurality of access channel type bits according to a receiving sequence;
setting a first preset sequence and a second preset sequence, wherein the first preset sequence and the second preset sequence both have the same number of bits as the time slot value sequence, the downlink time slot aligned with the first preset sequence is a first time slot, and the downlink time slot aligned with the second preset sequence is a second time slot;
and comparing the time slot value sequence with the first preset sequence and the second preset sequence respectively to obtain a first syndrome and a second syndrome, setting the current downlink time slot as a first time slot when the weight of the first syndrome is less than that of the second syndrome, and setting the current downlink time slot as a second time slot when the weight of the first syndrome is greater than that of the second syndrome.
In an embodiment, the step of comparing the time slot value sequence with the first preset sequence and the second preset sequence respectively to obtain a first syndrome and a second syndrome specifically includes:
and respectively carrying out exclusive OR operation on each bit of the time slot value sequence and each bit of the first preset sequence and the second preset sequence one by one to obtain a first syndrome and a second syndrome.
In one embodiment, in the step of comparing the time slot value sequence with the first preset sequence and the second preset sequence respectively to obtain a first syndrome and a second syndrome, when the weight of the first syndrome is equal to the weight of the second syndrome, the current downlink time slot is maintained.
In one embodiment, the step of receiving a plurality of access channel type bits from a plurality of consecutive downlink timeslots and forming the plurality of access channel type bits into a timeslot value sequence according to a receiving order is to receive at least four access channel type bits from at least four consecutive downlink timeslots and forming the at least four access channel type bits into a timeslot value sequence according to a receiving order.
In an embodiment, the step of setting a first preset sequence and a second preset sequence, where both the first preset sequence and the second preset sequence have the same number of bits as the time slot value sequence, specifically is:
setting a first preset sequence and a second preset sequence, wherein the first preset sequence and the second preset sequence both have the same number of bits as the time slot value sequence, the downlink time slot aligned with the first preset sequence is a first time slot, and the downlink time slot aligned with the second preset sequence is a second time slot;
and respectively carrying out Hamming code decoding on the first preset sequence and the second preset sequence.
An apparatus for timeslot alignment for narrowband wireless digital communication, comprising:
a time slot value sequence generating module, which is used for receiving a plurality of access channel type bits by a plurality of continuous downlink time slots and forming the plurality of access channel type bits into a time slot value sequence according to the receiving sequence;
a preset sequence setting module, configured to set a first preset sequence and a second preset sequence, where the first preset sequence and the second preset sequence both have the same number of bits as the time slot value sequence, a downlink time slot aligned with the first preset sequence is a first time slot, and a downlink time slot aligned with the second preset sequence is a second time slot;
and the comparison module is used for comparing the time slot value sequence with the first preset sequence and the second preset sequence respectively to obtain a first syndrome and a second syndrome, setting the current downlink time slot as the first time slot when the weight of the first syndrome is less than that of the second syndrome, and setting the current downlink time slot as the second time slot when the weight of the first syndrome is more than that of the second syndrome.
In one embodiment, the comparison module includes an exclusive OR sub-module,
the exclusive-or operation sub-module is configured to perform exclusive-or operation on each bit of the time slot value sequence and each bit of the first preset sequence and each bit of the second preset sequence one by one to obtain a first syndrome and a second syndrome.
In one embodiment, the comparison module further comprises a maintain time slot submodule configured to maintain a current downlink time slot when the weight of the first syndrome is equal to the weight of the second syndrome.
In an embodiment, the timeslot value sequence generation module is further configured to receive at least four access channel type bits from at least four consecutive downlink timeslots, and form a timeslot value sequence from the at least four access channel type bits according to a receiving order.
In one embodiment, the preset sequence setting module further comprises a sequence setting submodule and a decoding submodule;
the setting sequence submodule is used for setting a first preset sequence and a second preset sequence, the first preset sequence and the second preset sequence both have the same number of bits with the time slot value sequence, the downlink time slot aligned with the first preset sequence is a first time slot, and the downlink time slot aligned with the second preset sequence is a second time slot;
the decoding submodule is used for performing Hamming code decoding on the first preset sequence and the second preset sequence respectively.
According to the method and the device for aligning the time slots of the narrow-band wireless digital communication, the time slot value sequence obtained by continuously receiving the downlink time slots is respectively compared with the first preset sequence and the second preset sequence, so that the time slots of the downlink time slots are judged, the time slot value errors are effectively avoided, and the accuracy of time slot alignment is effectively improved.
Drawings
FIG. 1 is a schematic diagram of logical channels for narrow band wireless digital communication in accordance with a preferred embodiment of the present invention;
fig. 2 is a flowchart illustrating a method for timeslot alignment in narrowband wireless digital communication according to a preferred embodiment of the invention;
FIG. 3 is a functional block diagram of an apparatus for timeslot alignment in narrowband wireless digital communication according to a preferred embodiment of the present invention;
FIG. 4 is a functional block diagram of a comparison module according to a preferred embodiment of the present invention;
FIG. 5 is a functional block diagram of a default sequence setting module according to a preferred embodiment of the present invention;
FIG. 6 is a flow chart of an embodiment of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
In one embodiment, as shown in fig. 2, a method for aligning narrowband wireless digital communication time slots includes the following steps:
step S100, receiving a plurality of access channel type bits by a plurality of continuous downlink time slots, and forming a time slot value sequence by the plurality of access channel type bits according to a receiving sequence.
In this step, the mobile station continuously receives signals of a plurality of downlink time slots, reads a common broadcast channel in the downlink time slots, obtains access channel type bits through the common broadcast channel, wherein the access channel type bits comprise a time slot value, and the access channel type bits form a time slot value sequence according to the obtained sequence.
As shown in table 1, the 4 message bits of the access channel type bit include the following information elements:
TABLE 1 information element of access channel type bit
Wherein, TC is a time slot value, and the time slot value is 0, then the current downlink time slot is time slot 1, and the time slot value is 1, then the current downlink time slot is time slot 2.
Step S200, a first preset sequence and a second preset sequence are set, the first preset sequence and the second preset sequence have the same number of bits with the time slot value sequence, the downlink time slot aligned with the first preset sequence is a first time slot, and the downlink time slot aligned with the second preset sequence is a second time slot.
The first preset sequence and the second preset sequence are respectively used for aligning to the first time slot and the second time slot, and the first preset sequence and the second preset sequence are respectively composed of a plurality of access channel type bits and are respectively used for simulating a time slot value sequence aligned to the first time slot and a time slot value sequence aligned to the second time slot, for example, a time slot value in a received time slot value sequence is set to be aligned to the first time slot, so that the first preset sequence is obtained, and a time slot value in a received time slot value sequence is set to be aligned to the second time slot, so that the second preset sequence is obtained.
For example, the downlink time slot aligned with the first preset sequence is a first time slot, and the downlink time slot aligned with the second preset sequence is a second time slot, for example, the first preset sequence includes a plurality of time slot values, and a first time slot value sequentially set is 0, then the downlink time slot aligned with the first preset sequence is the first time slot, and if the first preset sequence includes a plurality of time slot values, and a first time slot value sequentially set is 1, then the downlink time slot aligned with the first preset sequence is the second time slot.
In one embodiment, step S200 specifically includes:
step S201, setting a first preset sequence and a second preset sequence, where the first preset sequence and the second preset sequence both have the same number of bits as the time slot value sequence, a downlink time slot aligned with the first preset sequence is a first time slot, and a downlink time slot aligned with the second preset sequence is a second time slot.
Step S202, performing hamming code decoding on the first preset sequence and the second preset sequence, respectively.
The hamming code is a Forward Error Correction (FEC) code, which can effectively check errors occurring in the data stream during transmission and effectively increase the reliability of data communication, for example, the hamming code in the present invention is hamming (7, 4) FEC, it should be understood that the hamming code includes many different combinations, and hamming (7, 4) FEC is the earliest and simplest one, and can only correct 1 bit Error, so the Error Correction capability is not strong, and when the signal is poor, the bit Error rate after decoding may increase. In this embodiment, after a first preset sequence and a second preset sequence are set, the first preset sequence and the second preset sequence are decoded by hamming codes respectively, so as to obtain the decoded first preset sequence and second preset sequence, so that the reliability of the first preset sequence and the second preset sequence is higher, and the comparison result in the next step is more accurate.
Step S300, comparing the time slot value sequence with the first preset sequence and the second preset sequence respectively to obtain a first syndrome and a second syndrome, setting the current downlink time slot as the first time slot when the weight of the first syndrome is less than the weight of the second syndrome, and setting the current downlink time slot as the second time slot when the weight of the first syndrome is greater than the weight of the second syndrome.
For example, the present invention is applied to an aligned channel aligned in time, that is, the timing relationship between an uplink channel and a downlink channel is the aligned channel, for example, the first time slot is a first channel, and the second time slot is a second channel.
It should be understood that, in the case of poor signal quality or interference, an error may occur in the received timeslot value sequence in the downlink timeslot, and in order to determine and obtain a relatively accurate result of the timeslot value sequence after the error, in an embodiment, each bit of the timeslot value sequence is subjected to an exclusive-or operation one by one with each bit of the first preset sequence and the second preset sequence to obtain a first syndrome and a second syndrome, the first syndrome is a result of the exclusive-or operation performed on each bit of the timeslot value sequence and the first preset sequence, the weight of the first syndrome is a number of "1" results in the first syndrome, and the greater the number of "1" results is, the greater the weight of the first syndrome is; the second syndrome is the result of exclusive-or operation between the time slot value sequence and the second preset sequence, the weight of the second syndrome is the number of the results of "1" in the second syndrome, and the weight of the second syndrome is increased when the number of the results of "1" is increased.
When the weight of the first syndrome is smaller than the weight of the second syndrome, that is, the difference between the time slot value sequence and the first preset sequence is smaller than the difference between the time slot value sequence and the second preset sequence, the probability that the time slot value sequence is aligned with the first time slot is relatively greater, and the current downlink time slot is set as the first time slot, that is, the current downlink time slot is aligned with the first time slot; on the contrary, when the weight of the first syndrome is greater than the weight of the second syndrome, that is, the difference between the time slot value sequence and the second preset sequence is smaller than the difference between the time slot value sequence and the first preset sequence, the current downlink time slot is set as the second time slot, so that the current downlink time slot is aligned to the second time slot.
In one embodiment, in step S300, when the weight of the first syndrome is equal to the weight of the second syndrome, the current downlink timeslot is maintained.
It should be understood that, during the continuous communication between the mobile station and the base station, the base station has a current downlink time slot, for example, aligned with the first time slot, or aligned with the second time slot, when the weight of the first syndrome is equal to the weight of the second syndrome, it indicates that the difference between the time slot value sequence and the first preset sequence at this time is equal to the difference between the time slot value sequence and the second preset sequence, and the probability that the current downlink time slot is aligned with the first time slot and the second time slot is equal, then the current downlink time slot is maintained. For example, before the mobile station continuously receives a plurality of downlink timeslots, the downlink timeslot of the base station is aligned to the first timeslot, and after the mobile station continuously receives a plurality of downlink timeslots, and the weight of the first syndrome is equal to the weight of the second syndrome, the mobile station maintains the current downlink timeslot and remains aligned to the first timeslot.
In order to improve the efficiency of timeslot alignment while improving the timeslot alignment rate, in an embodiment, step S100 specifically includes receiving at least four access channel type bits from at least four consecutive downlink timeslots, and forming a timeslot value sequence from the at least four access channel type bits according to a receiving order.
Specifically, after three downlink time slots are continuously received, the xor operation is performed with the first preset sequence or the second preset sequence, and the difference of the xor operation results is not large due to the small number of bits, so that the deviation of the time slot value sequence is not easy to judge, and the accuracy of time slot alignment is reduced.
As the length of the time slot value sequence increases, the difference between the first syndrome and the second syndrome of the result of the exclusive-or operation increases, but the efficiency of time slot alignment is reduced. Therefore, in order to improve the accuracy of timeslot alignment and improve timeslot alignment efficiency, in this embodiment, step S100 specifically includes receiving four access channel type bits from four consecutive downlink timeslots, and forming a timeslot value sequence from the four access channel type bits according to a receiving sequence.
In one embodiment, the first preset sequence is 0101, the second preset sequence is 1010, the first preset sequence is aligned with the first time slot, the second preset sequence is aligned with the second time slot, the second mobile station continuously receives four downlink time slots to obtain a time slot value sequence 1010, the time slot value sequence is subjected to exclusive or operation with the first preset sequence and the second preset sequence respectively to obtain results of 1111 and 0000, that is, the weight of the first syndrome is 4, and the weight of the second syndrome is 0.
If the received slot value is incorrect due to poor quality of the communication signal, for example, the slot value sequence obtained by decoding is 0100, the slot value sequence is subjected to exclusive or operation with the first preset sequence and the second preset sequence, the weight of the obtained first syndrome is 1, the weight of the obtained second syndrome is 3, the weight of the first syndrome is less than that of the second syndrome, the slot value sequence before the error is more close to the first preset sequence, and the possibility that the current downlink slot is aligned with the first slot is higher, that is, the actual slot value sequence is equal to the first preset sequence of 0101, so that the downlink slot is aligned with the first slot.
In one embodiment, as shown in fig. 6, the method of the present invention includes the following steps:
And 2, assuming that the terminal is aligned with the time slot 1, setting the TC bit of the data stream S before the Hamming code is encrypted as the value of the aligned time slot 1, generating a new data stream, decoding the Hamming code to obtain a data stream A, and performing XOR comparison on the data of the data stream A and the data stream S to obtain the different bit quantity N.
And 3, assuming that the terminal is aligned with the time slot 2, forcibly setting the TC bit of the data stream S before the Hamming code is encrypted as the value of the aligned time slot 2, generating a new TACT data stream, decoding the Hamming code to obtain a data stream B, and performing XOR comparison on the data of the data stream B and the data stream S to obtain different bit quantity M.
And 4, judging whether N is smaller than M, if N < M indicates that the possibility of aligning the time slot 1 is high, and if N > M indicates that the possibility of aligning the time slot 2 is high. If the time slot 1 is aligned at the time of step 1, then at this time, if N is not greater than M, it means that the time slot alignment is relatively accurate, and if N is greater than M, it means that the time slot alignment is relatively inaccurate and cannot be used. If time slot 2 is aligned at the time of step 1, then at this time, if M is not greater than N, it means that the time slot alignment is relatively accurate, and if M is greater than N, it means that the time slot alignment is relatively inaccurate and cannot be used.
As shown in fig. 3, a device for aligning timeslots in narrowband wireless digital communication according to a preferred embodiment includes: a time slot value sequence generating module 210, a preset sequence setting module 220 and a comparing module 230;
the timeslot value sequence generation module 210 is configured to receive a plurality of access channel type bits from a plurality of consecutive downlink timeslots, and form a timeslot value sequence from the plurality of access channel type bits according to a receiving order.
The preset sequence setting module 220 is configured to set a first preset sequence and a second preset sequence, where the first preset sequence and the second preset sequence both have the same number of bits as the time slot value sequence, a downlink time slot aligned with the first preset sequence is a first time slot, and a downlink time slot aligned with the second preset sequence is a second time slot.
The comparing module 230 is configured to compare the time slot value sequence with the first preset sequence and the second preset sequence respectively to obtain a first syndrome and a second syndrome, set the current downlink time slot as the first time slot when the weight of the first syndrome is less than the weight of the second syndrome, and set the current downlink time slot as the second time slot when the weight of the first syndrome is greater than the weight of the second syndrome.
In one embodiment, referring to fig. 4, the comparing module 230 includes an exclusive or sub-module 231, and the exclusive or sub-module 231 is configured to perform exclusive or operation on each bit of the time slot value sequence and each bit of the first predetermined sequence and the second predetermined sequence one by one to obtain a first syndrome and a second syndrome.
In one embodiment, referring again to fig. 4, the comparison module 230 further includes a maintain time slot submodule 232 configured to maintain the current downlink time slot when the weight of the first syndrome is equal to the weight of the second syndrome.
In an embodiment, the timeslot value sequence generating module 210 is further specifically configured to receive at least four access channel type bits from at least four consecutive downlink timeslots, and form a timeslot value sequence from the at least four access channel type bits according to a receiving order.
In one embodiment, as shown in fig. 5, the setting preset sequence module 220 further includes a setting sequence sub-module 221 and a decoding sub-module 222.
The sequence setting submodule 221 is configured to set a first preset sequence and a second preset sequence, where the first preset sequence and the second preset sequence both have the same number of bits as the time slot value sequence, a downlink time slot aligned with the first preset sequence is a first time slot, and a downlink time slot aligned with the second preset sequence is a second time slot.
The decoding sub-module 222 is configured to perform hamming code decoding on the first preset sequence and the second preset sequence, respectively.
It should be noted that, in the above system embodiment, each included module is only divided according to functional logic, but is not limited to the above division as long as the corresponding function can be implemented; in addition, the specific names of the functional modules are only for convenience of distinguishing from each other and are not used for limiting the protection scope of the present invention.
In addition, it can be understood by those skilled in the art that all or part of the steps in the method for implementing the embodiments described above may be implemented by instructing the relevant hardware through a program, and the corresponding program may be stored in a readable storage medium.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for time slot alignment in narrowband wireless digital communication, comprising:
receiving a plurality of access channel type bits by a plurality of continuous downlink time slots, and forming a time slot value sequence by the plurality of access channel type bits according to a receiving sequence;
setting a first preset sequence and a second preset sequence, wherein the first preset sequence and the second preset sequence both have the same number of bits as the time slot value sequence, the downlink time slot aligned with the first preset sequence is a first time slot, and the downlink time slot aligned with the second preset sequence is a second time slot;
comparing the time slot value sequence with the first preset sequence and the second preset sequence respectively to obtain a first syndrome and a second syndrome, wherein each bit of the time slot value sequence is subjected to exclusive or operation with each bit of the first preset sequence and each bit of the second preset sequence one by one to obtain the first syndrome and the second syndrome; setting a current downlink time slot as a first time slot when the weight of the first syndrome is less than the weight of the second syndrome, and setting the current downlink time slot as a second time slot when the weight of the first syndrome is greater than the weight of the second syndrome.
2. The method according to claim 1, wherein the step of setting a first preset sequence and a second preset sequence, the first preset sequence and the second preset sequence both having the same number of bits as the time slot value sequence, the downlink time slot aligned with the first preset sequence being a first time slot, and the downlink time slot aligned with the second preset sequence being a second time slot specifically comprises:
the first preset sequence and the second preset sequence are respectively used for aligning to the first time slot and the second time slot, and the first preset sequence and the second preset sequence are respectively composed of a plurality of access channel type bits and are respectively used for simulating a time slot value sequence aligned to the first time slot and a time slot value sequence aligned to the second time slot.
3. The method of claim 1, wherein in the step of obtaining a first syndrome and a second syndrome by comparing the time slot value sequence with the first preset sequence and the second preset sequence, respectively, the current downlink time slot is maintained when the weight of the first syndrome is equal to the weight of the second syndrome.
4. The method for timeslot alignment for narrowband wireless digital communication according to claim 1, wherein the step of receiving a plurality of access channel type bits from a plurality of consecutive downlink timeslots, and forming the plurality of access channel type bits into a timeslot value sequence according to the receiving order is specifically to receive at least four access channel type bits from at least four consecutive downlink timeslots, and forming the at least four access channel type bits into a timeslot value sequence according to the receiving order.
5. The method for timeslot alignment in narrowband wireless digital communication according to claim 4, wherein the step of receiving a plurality of access channel type bits from a plurality of consecutive downlink timeslots, and forming the plurality of access channel type bits into a timeslot value sequence according to the receiving order specifically comprises: four access channel type bits are received by four continuous downlink time slots, and the four access channel type bits are formed into a time slot value sequence according to the receiving sequence.
6. The method for timeslot alignment in narrowband wireless digital communication according to claim 1, wherein the step of setting a first preset sequence and a second preset sequence, both of which have the same number of bits as the timeslot value sequence, is specifically:
setting a first preset sequence and a second preset sequence, wherein the first preset sequence and the second preset sequence both have the same number of bits as the time slot value sequence, the downlink time slot aligned with the first preset sequence is a first time slot, and the downlink time slot aligned with the second preset sequence is a second time slot;
and respectively carrying out Hamming code decoding on the first preset sequence and the second preset sequence.
7. An apparatus for aligning time slots of narrowband wireless digital communication, comprising:
a time slot value sequence generating module, which is used for receiving a plurality of access channel type bits by a plurality of continuous downlink time slots and forming the plurality of access channel type bits into a time slot value sequence according to the receiving sequence;
a preset sequence setting module, configured to set a first preset sequence and a second preset sequence, where the first preset sequence and the second preset sequence both have the same number of bits as the time slot value sequence, a downlink time slot aligned with the first preset sequence is a first time slot, and a downlink time slot aligned with the second preset sequence is a second time slot;
a comparing module, configured to compare the time slot value sequence with the first preset sequence and the second preset sequence respectively to obtain a first syndrome and a second syndrome, set a current downlink time slot as a first time slot when a weight of the first syndrome is smaller than a weight of the second syndrome, and set the current downlink time slot as a second time slot when the weight of the first syndrome is larger than the weight of the second syndrome; the comparison module comprises an exclusive-or operation sub-module, and the exclusive-or operation sub-module is used for respectively carrying out exclusive-or operation on each bit of the time slot value sequence and each bit of the first preset sequence and the second preset sequence one by one to obtain a first syndrome and a second syndrome.
8. The apparatus of claim 7, wherein the comparison module further comprises a maintain timeslot submodule configured to maintain a current downlink timeslot when the weight of the first syndrome is equal to the weight of the second syndrome.
9. The apparatus for timeslot alignment of narrowband wireless digital communication according to claim 7, wherein the timeslot value sequence generation module is further configured to receive at least four access channel type bits from at least four consecutive downlink timeslots, and form the at least four access channel type bits into a timeslot value sequence according to a receiving order.
10. The apparatus for timeslot alignment of narrowband wireless digital communication according to claim 7, wherein the setting a preset sequence module further comprises a setting sequence submodule and a decoding submodule;
the setting sequence submodule is used for setting a first preset sequence and a second preset sequence, the first preset sequence and the second preset sequence both have the same number of bits with the time slot value sequence, the downlink time slot aligned with the first preset sequence is a first time slot, and the downlink time slot aligned with the second preset sequence is a second time slot;
the decoding submodule is used for performing Hamming code decoding on the first preset sequence and the second preset sequence respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610194556.8A CN105828363B (en) | 2016-03-30 | 2016-03-30 | Method and device for aligning time slots of narrow-band wireless digital communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610194556.8A CN105828363B (en) | 2016-03-30 | 2016-03-30 | Method and device for aligning time slots of narrow-band wireless digital communication |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105828363A CN105828363A (en) | 2016-08-03 |
| CN105828363B true CN105828363B (en) | 2020-04-21 |
Family
ID=56525373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610194556.8A Active CN105828363B (en) | 2016-03-30 | 2016-03-30 | Method and device for aligning time slots of narrow-band wireless digital communication |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105828363B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111459457B (en) * | 2020-03-18 | 2023-06-02 | 支付宝(杭州)信息技术有限公司 | Data checking method and device and computer equipment |
| CN111431576B (en) * | 2020-05-14 | 2022-07-08 | 上海道生物联技术有限公司 | Time division duplex communication system and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101162981A (en) * | 2006-10-12 | 2008-04-16 | 中兴通讯股份有限公司 | Frame structure generating method of TDD communication system |
| CN103024795A (en) * | 2011-09-27 | 2013-04-03 | 鼎桥通信技术有限公司 | Method for detecting abnormal synchronous timing in TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) |
| CN104579566A (en) * | 2014-12-31 | 2015-04-29 | 中国电子科技集团公司第七研究所 | Synchronous information detection method, system and general correlator |
| CN105323033A (en) * | 2014-06-30 | 2016-02-10 | 深圳市中兴微电子技术有限公司 | Multipath frame header detection method and device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140105194A1 (en) * | 2012-10-12 | 2014-04-17 | Motorola Solutions, Inc. | Method and apparatus for more efficient sharing of synchronized direct mode timeslots |
-
2016
- 2016-03-30 CN CN201610194556.8A patent/CN105828363B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101162981A (en) * | 2006-10-12 | 2008-04-16 | 中兴通讯股份有限公司 | Frame structure generating method of TDD communication system |
| CN103024795A (en) * | 2011-09-27 | 2013-04-03 | 鼎桥通信技术有限公司 | Method for detecting abnormal synchronous timing in TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) |
| CN105323033A (en) * | 2014-06-30 | 2016-02-10 | 深圳市中兴微电子技术有限公司 | Multipath frame header detection method and device |
| CN104579566A (en) * | 2014-12-31 | 2015-04-29 | 中国电子科技集团公司第七研究所 | Synchronous information detection method, system and general correlator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105828363A (en) | 2016-08-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108282247B (en) | Control information transmission method and device | |
| JP5138771B2 (en) | Apparatus for managing transmission and reception of broadcast channel signals and broadcast channel information | |
| US8331498B2 (en) | Blind modulation detection | |
| US10644835B1 (en) | System and method for interleaving distributed CRC in polar codes for early termination | |
| EP2160876B1 (en) | Method, signal and apparatus for managing the transmission and receipt of broadcast channel information | |
| US11336426B2 (en) | Authenticated confirmation and activation message | |
| US8190185B2 (en) | Method and system for decoding SACCH control channels in GSM-based systems with partial combining | |
| CN105828363B (en) | Method and device for aligning time slots of narrow-band wireless digital communication | |
| US7843989B2 (en) | Systems and methods for embedding a first signal in the coding of a second signal | |
| US20120008721A1 (en) | Communication terminal, method for receiving data and computer program product | |
| US10680659B2 (en) | System and method for improved decoding using identified recurring side information | |
| EP3635870B1 (en) | Distributed crc-assisted polar code construction | |
| US7899051B2 (en) | Broadcast channel signal, apparatus and method for transmitting and decoding broadcast channel information | |
| US8281216B2 (en) | Method for assigning and utilizing forward error correcting (FEC) codes | |
| US7957492B2 (en) | TFCI decoding apparatus and method | |
| US11381341B2 (en) | Reception apparatus, transmission apparatus, reception method, and transmission method | |
| US9838155B2 (en) | Error correction method and apparatus for radio link data |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20180131 Address after: 518000 Guangdong city of Shenzhen province Nanshan District Xili Street Lang Road No. 11, Tongfang information port A on the third floor Applicant after: Shenzhen kelixun Communication Co., Ltd. Address before: 518000 Guangdong city of Shenzhen province Nanshan District Pine Hill Qi Min Road No. 1 Betel five or six storey building Applicant before: Kirisun Communication Co., Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |