CN109756947B - PBCH (physical broadcast channel) receiving method, terminal, electronic equipment and storage medium - Google Patents
PBCH (physical broadcast channel) receiving method, terminal, electronic equipment and storage medium Download PDFInfo
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Abstract
The embodiment of the invention provides a PBCH receiving method, a terminal, electronic equipment and a storage medium. The terminal receives a signal of a subgroup, and the signal and the front NComb-1 subgroups form NComb subgroup sets, and the NComb is the combining times used in the demodulation process; aiming at NComb subgroups, determining a scrambling code corresponding to each subgroup to obtain NComb scrambling code sets, wherein each scrambling code set comprises: {0, 1., NComb-1}, { 1., NComb }, { 2., NComb +1}, … …, { M-NComb + 1., M }; numbering each scrambling code set as k-0, 1, …, M-NComb +1, initializing k-0, wherein M is the number of subgroups included in one TTI; using the kth scrambling code set to demodulate the NComb subgroups to obtain a demodulation result; and if the demodulation result is successful, the terminal acquires the information of the cell. The method demodulates after the terminal receives a subgroup, instead of waiting for the terminal to receive all subgroups of a TTI, if the demodulation is correct in a certain combining frequency, the information of the cell is obtained, and the time of the terminal accessing the network can be shortened.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a PBCH (physical broadcast channel) receiving method, a terminal, electronic equipment and a storage medium.
Background
A process of accessing a network of a certain cell is called a network access process, and a network access process needs to acquire cell information.
The method for acquiring the information of the cell is to monitor the broadcast of the cell, that is, the terminal receives the signal of the PBCH (Physical broadcast channel) of the cell.
The following describes a manner in which a terminal receives a signal of a PBCH provided in the prior art.
In a communication system, Time is generally divided into TTIs (Transmission Time Interval), one TTI including at least one radio frame.
Fig. 1 is a TTI diagram of a PBCH of the prior art.
As shown in fig. 1, taking a multi-subband system of the prior art as an example, the multi-subband system selects a number of physical subbands as broadcast subbands. The TTI of each broadcast sub-band is divided into M sub-groups, each sub-group has its own number according to the time sequence, and each sub-group is divided into N radio frames. I.e. one TTI comprises M x N radio frames.
The base station employs Scrambling (Scrambling) to scramble the information of the cell for adaptive transmission. The information contained in each subgroup of the same TTI is the same but the scrambling code used is different.
It should be noted that, at this time, the terminal performs blind detection on the PBCH, and when the terminal receives a certain radio frame, the terminal can determine the sub-group corresponding to the radio frame, but cannot determine the number of the sub-group, and does not know the TTI corresponding to the sub-group.
The terminal knows in advance that each subgroup comprises N radio frames, one TTI comprises M subgroups, namely one TTI comprises M radio frames, after M radio frames are obtained in total, the demodulation is carried out uniformly, if the demodulation is successful, the information of a cell is obtained, if the demodulation is wrong, a received signal is updated to carry out the next attempt, and the state judgment of the broadcast subband is completed by searching for a plurality of times.
It can be understood that, if the number of the subgroups is 8, and the number of the radio frames included in the subgroups is 16, the terminal needs to receive 128 radio frames of the 8 subgroups and then uniformly demodulate to obtain the information of the cell, and the terminal access process consumes at least the duration of the 128 radio frames, thereby resulting in an overall slow terminal access speed.
At present, no corresponding method exists in the prior art for solving the problems.
Disclosure of Invention
In view of the defects in the prior art, embodiments of the present invention provide a method, a terminal, an electronic device, and a storage medium for PBCH reception.
In one aspect, an embodiment of the present invention provides a method for receiving a PBCH, where the method includes:
and 4, if the demodulation result is successful, the terminal acquires the information of the cell.
In another aspect, an embodiment of the present invention provides a terminal, where the terminal includes:
a receiving module, configured to receive a signal of a subgroup, and form NComb subgroup sets with the previous NComb-1 subgroups, where NComb is a combining number used in a demodulation process, and the signal of the subgroup includes information of a cell;
a determining module, configured to determine, for NComb subgroups, a scrambling code corresponding to each subgroup to obtain NComb scrambling code sets, where each scrambling code set includes: {0, 1., NComb-1}, { 1., NComb }, { 2., NComb +1}, … …, { M-NComb + 1., M }; numbering each scrambling code set as k-0, 1, …, M-NComb +1, initializing k-0, wherein M is the number of subgroups included in one TTI;
the demodulation module is used for demodulating the NComb subgroups by using the kth scrambling code set to obtain a demodulation result;
and the acquisition module is used for acquiring the information of the cell by the terminal if the demodulation result is successful.
In another aspect, an embodiment of the present invention further provides an electronic device, which includes a memory, a processor, a bus, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the above method when executing the program.
In another aspect, an embodiment of the present invention further provides a storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the steps of the above method.
It can be seen from the foregoing technical solutions that, in the PBCH receiving method, the terminal, the electronic device, and the storage medium provided in the embodiments of the present invention, demodulation is performed after the terminal receives one sub-group, instead of waiting until the terminal receives all sub-groups of one TTI, and if demodulation is correct for a certain number of combining times, information of a cell is obtained, so that the time for the terminal to access the network can be shortened.
Drawings
Fig. 1 is a TTI diagram of a PBCH of the prior art;
fig. 2 is a flowchart illustrating a method for receiving PBCH according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a terminal according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.
Fig. 2 is a flowchart illustrating a method for receiving a PBCH according to an embodiment of the present invention.
As shown in fig. 2, the method provided in the embodiment of the present invention specifically includes the following steps:
optionally, the base station broadcasts on a physical broadcast channel PBCH, broadcasting the signals of the subgroup.
Optionally, the method for receiving a PBCH in the embodiment of the present invention is implemented on a terminal, specifically, implemented on a physical layer of the terminal.
Optionally, the terminal moves to the cell to perform blind detection on the PBCH, and receives a subset of signals.
The first subset of signals includes a predetermined number of radio frames, and accordingly, the step of the terminal receiving the first subset of signals of the physical broadcast channel includes:
the terminal searches the position of the synchronous frame;
after the position of the search synchronization frame is determined, the number of the continuously received wireless frames reaches the preset number, and the signals of the first subgroup are obtained.
Optionally, the terminal receives a subgroup by first performing frame synchronization to determine a starting position of the subgroup.
Optionally, in order to separate the signals correctly, the signal of the subgroup transmitted by the base station includes a start flag of the subgroup: and the terminal searches the synchronization frame to determine the starting position of the subgroup. The terminal can predetermine the subgroup comprising the number N of the wireless frames, and continuously receives N-1 wireless frames after searching and determining the positions of the synchronous frames, so that all the wireless frames of the subgroup can be obtained after the synchronous frames.
For example, a sub-group includes 16 wireless frames, including a synchronization frame (frame 0) and other wireless frames numbered 1-15, after the terminal searches for the synchronization frame, the terminal determines the frame 0 as a sub-group, continuously receives the frames 1-15 after the frame 0, and groups the frames 0-15 into a sub-group.
For example, the terminal receives signals of a first subset of the physical broadcast channels, where the signals of the first subset are received by the terminal on the physical broadcast channels, and the signals of the first subset include information of cells;
taking the example of receiving one sub-group as an example, the signal of the first sub-group received on PBCH is referred to as the signal of the first sub-group.
Determining a scrambling code group corresponding to the first subgroup, wherein the scrambling code group comprises a plurality of scrambling codes, each scrambling code corresponds to a subgroup of one TTI, and the number of the scrambling codes is the same as the total number of the subgroups of one TTI;
optionally, a TTI is divided into a plurality of subgroups, each subgroup has its own number according to a timing sequence, information included in each subgroup of the same TTI is the same, and each subgroup includes the same number of radio frames. The terminal cannot determine the number of the first sub-group in the TTI, i.e. it is not certain whether the first sub-group received is sub-group 0 or sub-group 1 or another sub-group.
Alternatively, the terminal may determine in advance the total number of subgroups of one TTI, and for the first subgroup, the terminal generates a scrambling code group corresponding to the first subgroup, where the scrambling code group includes a plurality of scrambling codes, and the number of scrambling codes is equal to the total number of subgroups included in the TTI.
Optionally, one TTI includes M subgroups, each subgroup corresponding to 1 scrambling code, i.e. the terminal predicts that one TTI includes subgroup 0, subgroup 1, … …, and subgroup M-1, respectively assuming that the first subgroup is subgroup 0, subgroup 1, … … subgroup M-1, and generates the scrambling codes corresponding to subgroup 0, subgroup 1, and … … subgroup M-1, respectively. That is, for the first sub-group, M scrambling codes corresponding to the first sub-group are predicted, and the M scrambling codes are taken as the scrambling code group.
Optionally, the scrambling code is locally generated by the terminal according to scrambling code information, and the scrambling code information is determined when the terminal signs a contract and has uniqueness.
Optionally, according to a mode in the prior art, a scrambling code corresponding to the first sub-group is generated according to scrambling code information, so as to obtain a scrambling code group.
It should be noted that, in the prior art, it is assumed that the terminal is located at the farthest position from the base station, so that the signal is weak, and therefore, the terminal receives enough subgroups according to the protocol specification, and then performs the combining check, so that the terminal decodes as correctly as possible. Therefore, the terminal access process is to receive all subgroups of a TTI and then demodulate the received subgroups, and the terminal waits for the duration of a TTI to access the network.
In practical application, a terminal just enters a cell, and the terminal is not necessarily far away from a base station and may be close to the base station. If the terminal is not at the farthest position from the base station, the technical means of receiving all subgroups of one TTI and then demodulating is also adopted, and in fact, the process of accessing the network by the terminal takes unnecessary time.
In the embodiment of the invention, the terminal network access process is to try to demodulate after receiving a subgroup of TTI to obtain a demodulation result.
There are various ways to obtain the demodulation result in step 3 in the method, and one of them is taken as an example in this embodiment.
The step 3 specifically comprises;
descrambling the NComb subgroup by using the kth scrambling code set to obtain a descrambling signal;
and carrying out rate matching, decoding and CRC (cyclic redundancy check) on the descrambled signal, wherein the CRC result is a demodulation result.
And 4, if the demodulation result is successful, the terminal acquires the information of the cell.
Optionally, after obtaining the information of the cell, the terminal completes network access and performs subsequent service transmission in the cell.
If the terminal is close to the base station and the signal is good, the demodulation result is likely to be successful, and the terminal can access the network only by waiting for the duration of one subgroup, so that the network access time of the terminal can be shortened.
If the terminal is far away from the base station and the signal is weak, the demodulation result is likely to fail, and the signals of the first subgroup are cached so as to be demodulated subsequently.
In the PBCH receiving method provided in this embodiment, the terminal receives one sub-group and then performs demodulation, instead of waiting until the terminal receives all sub-groups of one TTI, if demodulation is correct for a certain number of combining times, information of a cell is obtained, and the time for the terminal to access the network can be shortened.
On the basis of the foregoing embodiments, a method for receiving a PBCH according to an embodiment of the present invention includes:
if the demodulation result is failure, the method further comprises:
and 5, if k < ═ M-NComb + 1 and k < ═ k +1, demodulating the NComb subgroup by using the k +1 th scrambling code set to obtain a demodulation result.
Demodulating the signals of the first subgroup by adopting each scrambling code to obtain corresponding demodulation results;
after the scrambling code group is determined, traversing each scrambling code of the scrambling code group, and demodulating the signals of the first subgroup by adopting each scrambling code respectively.
And if the demodulation result is successful, stopping demodulation.
Other steps of the embodiment of the present invention are similar to the above steps, and are not described again in this embodiment.
In the PBCH receiving method provided in this embodiment, the terminal traverses each scrambling code to demodulate, so that the network access time of the terminal can be shortened.
On the basis of the foregoing embodiments, a method for receiving a PBCH according to an embodiment of the present invention includes:
if the demodulation result is failure, the method further comprises:
step 6, initializing the updating times j of the subgroup to 1;
step 7, if k is larger than M-NComb +1, receiving 1 subgroup, forming NComb subgroup sets with the previous NComb-1 subgroups, and caching the previous received redundant subgroups to the local;
step 8, aiming at NComb subgroups, subgroup updating is carried out, and a scrambling code set is {0, 1., NComb-1}, if a subgroup set is a starting subgroup set of 1 TTI;
step 9, using the scrambling code set to demodulate the NComb subgroups to obtain demodulation results;
and step 10, if the demodulation result is successful, the terminal acquires the information of the cell.
As described above, after traversing each scrambling code for the received first subset, when the check result is still a decoding error, the first subset is cached locally.
Optionally, the terminal performs descrambling, rate matching, decoding, and CRC check after receiving the first subset from the base station, so as to obtain a check result.
Due to the limited memory space of the terminal, the first subset of the subset set is the first subset originally received by the terminal from the base station, and the data generated in the middle process is not stored.
Optionally, during the process of blind detection of the PBCH, the terminal continues to receive the sub-group, that is, during the process of demodulating the first sub-group after receiving the first sub-group, continues to receive the next sub-group for subsequent decoding. The next subgroup received after the first subgroup is referred to as the second subgroup.
Because the demodulation of the first subgroup fails, the number of the first subgroup in the TTI cannot be determined, and similarly, the terminal cannot determine the number of the second subgroup, and because the first subgroup and the second subgroup are received by the terminal continuously, the numbers of the first subgroup and the second subgroup are continuous, and the timing sequence of the first subgroup and the second subgroup is that the first subgroup is before and the second subgroup is after.
Taking the merging time as 2 as an example, there is a subgroup combination, which is the signals of the first subgroup and the second subgroup, and then there may be M-1 cases for the numbering: (0,1),(1,2),(2,3),(3,4),(4,5),(5,6),(6,7). Where, (0,1) indicates that the number of the first subgroup signal in the TTI is subgroup 0, and the number of the second subgroup signal in the same TTI is subgroup 1.
The signals of the first subgroup and the signals of the second subgroup comprised by one subgroup combination are demodulated, respectively.
And if the second demodulation result is failure after traversing all the subgroup combinations, buffering the signals of the first subgroup and the signals of the second subgroup so as to carry out decoding subsequently.
In the embodiment of the invention, the two subgroups are combined for demodulation, so that the access speed of the terminal can be increased compared with the prior art that all subgroups are combined for demodulation.
There are two possibilities for the TTI corresponding to the next subgroup received by the terminal: one corresponding to the same TTI as the first sub-group and the other corresponding to a different TTI as the first sub-group.
If the second demodulation result after traversing all the subgroups is failed, it indicates that the first subgroup and the second subgroup may not be signals of the subgroup of the same TTI but signals of two subgroups across TTIs.
For this case, the sub-combinations are: (7,0). The first subset is subset 7 of one TTI and the second subset is subset 0 of the next TTI.
Optionally, for this combination, the subgroup combination is not demodulated since the result of the demodulation can be predicted to be a failure.
If the demodulation result is failure, the method further comprises:
the sub-group update count j is j +1, and if j < NComb-1, step 7-9 is performed.
If j > is NComb-1, the merging frequency updates NComb to NComb + 1, and if NComb < > is the upper limit of the merging frequency, step 1 is executed.
Other steps of the embodiment of the present invention are similar to the above steps, and are not described again in this embodiment.
The PBCH receiving method provided in this embodiment can perform demodulation more comprehensively by reasonably estimating that the previous subset set is TTI-spanning.
On the basis of the foregoing embodiments, a method for receiving a PBCH according to an embodiment of the present invention includes:
if the demodulation result is failure, the method further comprises:
if j < NComb-1, the sub-group update count j is j +1, and step 7 is performed.
Other steps of the embodiment of the present invention are similar to the above steps, and are not described again in this embodiment.
In the PBCH receiving method provided in this embodiment, after combining a plurality of signals, the signal-to-noise ratio of the combined signals is improved, and the success rate of demodulation is improved.
On the basis of the foregoing embodiment, in the PBCH receiving method provided in the embodiment of the present invention, if the second demodulation result is a failure, the method further includes:
if j > is NComb-1, the merging frequency updates NComb to NComb + 1, and if NComb < > is the upper limit of the merging frequency, step 1 is executed.
If the check result is wrong in decoding, then the steps of descrambling, decoding and checking are carried out for the next subgroup combination.
And if the demodulation results obtained by traversing the subgroup combination are all failures, which means that the demodulation is not successful only by using the signals of the two subgroups, updating the merging times until all subgroups of one TTI are received.
Taking the number of combining times as 3 as an example, the signals of the first subset and the signals of the second subset are buffered, and form a subset set with the signals of the third subset (2+1), which is the signals of the first subset received by the terminal after the signals of the second subset.
The inability to decode successfully for a subgroup may be due to a lower signal-to-noise ratio. Accordingly, the snr of the next subset may be comparable and decoding may not be performed separately.
Combining the plurality of signals to obtain a combined signal; signal combining is a signal modulation method in the prior art, and combines and outputs a plurality of input low signal-to-noise ratio signals after being added, so as to improve the signal-to-noise ratio.
Alternatively, one combined signal may be obtained for each combination. The information is unchanged after combination, the signal-to-noise ratio of the combined signal is improved, and therefore the decoding success probability is increased.
And decoding the combined signal, wherein the demodulation result is successful.
Other steps of the embodiment of the present invention are similar to the above steps, and are not described again in this embodiment.
In the PBCH receiving method provided in this embodiment, the first M subgroups are descrambled respectively, and the two obtained descrambled signals are combined, so that the signal-to-noise ratio of the combined signal is improved, the combined signal is verified, and the success rate of decoding is improved.
In order to more fully understand the technical content of the present invention, on the basis of the above embodiments, the method for receiving PBCH provided in the present embodiment is described in detail.
In view of the problems in the prior art, the present embodiment provides a method and a terminal for receiving a Physical Broadcast Channel (PBCH) of a multi-subband system, so that the number of combining times is variable. And when the UE receives the PBCH through the network, the UE respectively uses different combining times and carries out corresponding scrambling code group search under each combining time.
The Physical Broadcast Channel (PBCH) receiving method is specifically described as follows, and table 1 is a specific parameter configuration table:
it should be noted that, the combining times used in the demodulation process are denoted as NComb, and the maximum of 8 in table 1, there are 4 combining times, and there may be 8 in the actual process, and the minimum combining time is 1, i.e. 1-8.
1. Setting NComb to 1;
2. receiving signals of 1 subgroup, and forming NComb subgroup sets with the front NComb-1 subgroups;
3. corresponding to NComb subgroups, NComb scrambling codes also form a set, and possible scrambling code sets are: {0, 1., NComb-1}, { 1., NComb }, { 2., NComb +1}, … …, {7-NComb + 1., 7}, which may be numbered as k ═ 0,1, …,7-NComb + 1. Initializing k to 0, and then performing the following processing:
a) sequentially descrambling the NComb subgroups by using the kth scrambling code set;
b) completing rate matching, decoding and CRC (cyclic redundancy check) after descrambling;
c) and selecting according to the CRC check result:
CRC is correct: saving the final value of NComb, calculating the frame number, reporting the result and exiting;
CRC failure: if k is k +1 and k is greater than 7-NComb +1, proceeding to step 4; if k < 7-NComb +1, repeating steps a) -c);
4. initializing a subgroup updating time j to 1;
5. receiving signals of 1 subgroup, forming NComb subgroup sets with the previous NComb-1 subgroups, and continuously storing the previous received subgroups until all subgroups are received.
The embodiment of the invention has variable combining times during receiving, tries each combining time in turn from the minimum combining time (1), and judges whether to quit by whether the demodulation is correct or not. The receiving scheme can fully utilize the characteristic that the demodulation performance is possibly different when the geographic position of the UE is different, reduce the receiving cache time and accelerate the network access speed of the UE under the condition of not changing the coverage area of a cell.
Fig. 3 is a schematic structural diagram of a terminal according to yet another embodiment of the present invention.
Referring to fig. 3, on the basis of the foregoing embodiment, the terminal provided in this embodiment includes a receiving module 31, a determining module 32, a demodulating module 33, and an obtaining module 34, where:
the receiving module 31 is configured to receive a signal of a subgroup, and form NComb subgroup sets with the previous NComb-1 subgroups, where NComb is a combining number used in a demodulation process, and the signal of the subgroup includes information of a cell; the determining module 32 is configured to determine, for the NComb subgroups, a scrambling code corresponding to each subgroup to obtain NComb scrambling code sets, where the scrambling code set includes: {0, 1., NComb-1}, { 1., NComb }, { 2., NComb +1}, … …, { M-NComb + 1., M }; numbering each scrambling code set as k-0, 1, …, M-NComb +1, initializing k-0, wherein M is the number of subgroups included in one TTI; the demodulation module 33 is configured to demodulate the NComb subgroup with the kth scrambling code set to obtain a demodulation result; the obtaining module 34 is configured to, if the demodulation result is successful, obtain the information of the cell by the terminal.
The terminal provided in this embodiment may be used to execute the method in the foregoing method embodiment, and this implementation is not described again.
In the terminal provided in this embodiment, the demodulation module attempts to demodulate after receiving a sub-group of one TTI to obtain a demodulation result, instead of waiting until the terminal receives all sub-groups of one TTI, and if the demodulation is correct for a certain number of combining times, the obtaining module obtains information of a cell, thereby shortening the time for the terminal to access the network.
Fig. 4 is a schematic structural diagram of an electronic device according to yet another embodiment of the present invention.
Referring to fig. 4, an electronic device provided by the embodiment of the present invention includes a memory (memory)41, a processor (processor)42, a bus 43, and a computer program stored in the memory 41 and running on the processor. The memory 41 and the processor 42 complete communication with each other through the bus 43.
The processor 42 is used to call the program instructions in the memory 41 to implement the method of fig. 2 when executing the program.
In another embodiment, the processor, when executing the program, implements the method of:
and 4, if the demodulation result is successful, the terminal acquires the information of the cell.
In another embodiment, the processor, when executing the program, implements the method of: the step 3 specifically comprises;
descrambling the NComb subgroup by using the kth scrambling code set to obtain a descrambling signal;
and carrying out rate matching, decoding and CRC (cyclic redundancy check) on the descrambled signal, wherein the CRC result is a demodulation result.
In another embodiment, the processor, when executing the program, implements the method of: if the demodulation result is failure, the method further comprises:
and 5, if k < ═ M-NComb + 1 and k < ═ k +1, demodulating the NComb subgroup by using the k +1 th scrambling code set to obtain a demodulation result.
In another embodiment, the processor, when executing the program, implements the method of: if the demodulation result is failure, the method further comprises:
step 6, initializing the updating times j of the subgroup to 1;
step 7, if k is larger than M-NComb +1, receiving 1 subgroup, forming NComb subgroup sets with the previous NComb-1 subgroups, and caching the previous received redundant subgroups to the local;
step 8, aiming at NComb subgroups, subgroup updating is carried out, and a scrambling code set is {0, 1., NComb-1}, if a subgroup set is a starting subgroup set of 1 TTI;
step 9, using the scrambling code set to demodulate the NComb subgroups to obtain demodulation results;
and step 10, if the demodulation result is successful, the terminal acquires the information of the cell.
In another embodiment, the processor, when executing the program, implements the method of: if the demodulation result is failure, the method further comprises:
the sub-group update count j is j +1, and if j < NComb-1, step 7-9 is performed.
In another embodiment, the processor, when executing the program, implements the method of: if j > is NComb-1, the merging frequency updates NComb to NComb + 1, and if NComb < > is the upper limit of the merging frequency, step 1 is executed.
In another embodiment, the processor, when executing the program, implements the method of: and if NComb is larger than the upper limit of the merging times, reporting the result to a protocol layer.
The electronic device provided in this embodiment may be configured to execute the program corresponding to the method in the foregoing method embodiment, and this implementation is not described again.
In the electronic device provided in this embodiment, when the processor executes the program, the terminal performs demodulation after receiving one sub-group, instead of waiting until the terminal receives all sub-groups of one TTI, and if demodulation is correct for a certain number of combining times, information of a cell is obtained, so that the time for the terminal to access the network can be shortened.
A further embodiment of the present invention provides a storage medium having a computer program stored thereon, which when executed by a processor implements the steps of fig. 2.
In another embodiment, the program when executed by a processor implements a method comprising:
the step 3 specifically comprises;
descrambling the NComb subgroup by using the kth scrambling code set to obtain a descrambling signal;
and carrying out rate matching, decoding and CRC (cyclic redundancy check) on the descrambled signal, wherein the CRC result is a demodulation result.
In another embodiment, the program when executed by a processor implements a method comprising:
if the demodulation result is failure, the method further comprises:
and 5, if k < ═ M-NComb + 1 and k < ═ k +1, demodulating the NComb subgroup by using the k +1 th scrambling code set to obtain a demodulation result.
In another embodiment, the program when executed by a processor implements a method comprising:
the method is characterized in that: if the demodulation result is failure, the method further comprises:
step 6, initializing the updating times j of the subgroup to 1;
step 7, if k is larger than M-NComb +1, receiving 1 subgroup, forming NComb subgroup sets with the previous NComb-1 subgroups, and caching the previous received redundant subgroups to the local;
step 8, aiming at NComb subgroups, subgroup updating is carried out, and a scrambling code set is {0, 1., NComb-1}, if a subgroup set is a starting subgroup set of 1 TTI;
step 9, using the scrambling code set to demodulate the NComb subgroups to obtain demodulation results;
and step 10, if the demodulation result is successful, the terminal acquires the information of the cell.
In another embodiment, the program when executed by a processor implements a method comprising:
if the demodulation result is failure, the method further comprises:
the sub-group update count j is j +1, and if j < NComb-1, step 7-9 is performed.
In another embodiment, the program when executed by a processor implements a method comprising:
if j > is NComb-1, the merging frequency updates NComb to NComb + 1, and if NComb < > is the upper limit of the merging frequency, step 1 is executed.
In another embodiment, the program when executed by a processor implements a method comprising:
and if NComb is larger than the upper limit of the merging times, reporting the result to a protocol layer.
In the storage medium provided in this embodiment, when the program is executed by the processor, the method in the foregoing method embodiment is implemented, and details of this implementation are not described again.
In the storage medium provided in this embodiment, when the processor executes the program, the terminal performs demodulation after receiving one sub-group, instead of waiting until the terminal receives all sub-groups of one TTI, and if demodulation is correct for a certain number of combining times, information of a cell is obtained, so that the time for the terminal to access the network can be shortened.
Those skilled in the art will appreciate that although some embodiments described herein include some features included in other embodiments instead of others, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments.
Those skilled in the art will appreciate that the steps of the embodiments may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functionality of some or all of the components according to embodiments of the present invention. The present invention may also be embodied as apparatus or device programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (10)
1. A method of PBCH reception, the method comprising:
step 1, a terminal receives a signal of a subgroup, and forms NComb subgroup sets with the previous NComb-1 subgroups to start demodulating the NComb subgroups, wherein NComb is the merging frequency used in the demodulation process, and the signal of the subgroup comprises the information of a cell;
step 2, aiming at NComb subgroups, determining a scrambling code corresponding to each subgroup to obtain NComb scrambling code sets, wherein each scrambling code set comprises: {0, 1., NComb-1}, { 1., NComb }, { 2., NComb +1}, … …, { M-NComb + 1., M }; numbering each scrambling code set as k-0, 1, …, M-NComb +1, initializing k-0, wherein M is the number of subgroups included in one TTI;
step 3, demodulating the NComb subgroups by using the kth scrambling code set to obtain a demodulation result;
and 4, if the demodulation result is successful, the terminal acquires the information of the cell.
2. The method of claim 1, wherein: the step 3 specifically comprises;
descrambling the NComb subgroup by using the kth scrambling code set to obtain a descrambling signal;
and carrying out rate matching, decoding and CRC (cyclic redundancy check) on the descrambled signal, wherein the CRC result is a demodulation result.
3. The method of claim 2, wherein: if the demodulation result is failure, the method further comprises:
and 5, if k < ═ M-NComb +1 and k < ═ k +1, demodulating the NComb subgroup by using the k +1 th scrambling code set to obtain a demodulation result.
4. The method of claim 1, wherein: if the demodulation result is failure, the method further comprises:
step 6, initializing the updating times j of the subgroup to 1;
step 7, if k is larger than M-NComb +1, receiving 1 subgroup, forming NComb subgroup sets with the previous NComb-1 subgroups, and caching the previous received redundant subgroups to the local;
step 8, aiming at NComb subgroups, subgroup updating is carried out, and a scrambling code set is {0, 1., NComb-1}, if a subgroup set is a starting subgroup set of 1 TTI;
step 9, using the scrambling code set to demodulate the NComb subgroups to obtain demodulation results;
and step 10, if the demodulation result is successful, the terminal acquires the information of the cell.
5. The method of claim 4, wherein if the demodulation result is a failure, the method further comprises:
the sub-group update count j is j +1, and if j < NComb-1, step 7-9 is performed.
6. The method of claim 5, wherein: if j > is NComb-1, the merging frequency updates NComb to NComb +1, and if NComb < > is the upper limit of the merging frequency, step 1 is executed.
7. The method of claim 6, wherein: and if NComb is larger than the upper limit of the merging times, reporting the result to a protocol layer.
8. A terminal, characterized in that the terminal comprises:
a receiving module, configured to receive a signal of a subgroup, form NComb subgroup sets with the previous NComb-1 subgroups, and start demodulating the NComb subgroups, where NComb is a combining number used in a demodulation process, and the signal of a subgroup includes information of a cell;
a determining module, configured to determine, for NComb subgroups, a scrambling code corresponding to each subgroup to obtain NComb scrambling code sets, where each scrambling code set includes: {0, 1., NComb-1}, { 1., NComb }, { 2., NComb +1}, … …, { M-NComb + 1., M }; numbering each scrambling code set as k-0, 1, …, M-NComb +1, initializing k-0, wherein M is the number of subgroups included in one TTI;
the demodulation module is used for demodulating the NComb subgroups by using the kth scrambling code set to obtain a demodulation result;
and the acquisition module is used for acquiring the information of the cell by the terminal if the demodulation result is successful.
9. An electronic device comprising a memory, a processor, a bus, and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program implements the steps of any of claims 1-7.
10. A storage medium having a computer program stored thereon, characterized in that: the program when executed by a processor implementing the steps of any of claims 1-7.
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