CN108738137B - Processing method and device for sending PBCH - Google Patents
Processing method and device for sending PBCH Download PDFInfo
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- CN108738137B CN108738137B CN201710245331.5A CN201710245331A CN108738137B CN 108738137 B CN108738137 B CN 108738137B CN 201710245331 A CN201710245331 A CN 201710245331A CN 108738137 B CN108738137 B CN 108738137B
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
Abstract
The embodiment of the invention provides a processing method and a device for sending PBCH, wherein the method comprises the following steps: averagely distributing the coded system broadcast messages to M PBCHs in a broadcast subband, wherein the occupation ratio of the M PBCHs in the broadcast subband is more than 50%; and sequentially transmitting each PBCH, wherein each PBCH occupies one radio frame. The device performs the above method. The processing method and the processing device for sending the PBCH can improve the detection success rate of the PBCH detected by the mobile terminal.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a processing method and a processing device for sending PBCH.
Background
In a downlink of a Long Term Evolution (LTE) private network system, a Physical Broadcast Channel (PBCH) is used to carry information of a Master Information Block (MIB) in a system broadcast message. The MIB information contains a certain amount of information that is the most basic and transmitted most often, such as system frame number, reference signal power, busy/idle indication, etc. The PBCH mode is sent to the mobile terminal by the base station, so that the mobile terminal can acquire the corresponding system broadcast message, and further the mobile terminal can acquire some basic characteristics of the current network and the current cell. It can be seen that the PBCH information can be received on the premise that the mobile terminal normally performs service transmission, so that the PBCH is required to have a high detection success rate that can be detected by the mobile terminal.
The prior art selects a segment of frequency domain resources as a broadcast sub-band, and sends PBCH to a mobile terminal through a broadcast channel (hereinafter referred to as BCH) encoded in the broadcast sub-band, fig. 1 is a schematic diagram of PBCH sent by BCH encoded in the prior art, as shown in fig. 1, after an original system broadcast message is subjected to Cyclic Redundancy Check (Cyclic Redundancy Check, hereinafter referred to as CRC) and encoded, the encoded system broadcast message is averagely divided into 4 information blocks and mapped onto 4 radio frames, the encoded system broadcast message occupies 4 radio frames in total, each radio frame corresponds to 1 PBCH, one PBCH is sent every Interval of a primary synchronization signal (hereinafter referred to as PSS), 4 required Time intervals for transmitting the encoded system broadcast message constitute 1 Transmission Time Interval (Transmission Interval, hereinafter referred to as TTI), and the PBCH is calculated by 25ms for each Transmission, if the PSS at each interval is also calculated for 25ms, the TTI required to complete transmission of a system broadcast message after one complete encoding is 8 × 25ms — 200 ms. With the continuous development of new wireless communication technologies and the vigorous development of mobile internet and internet of things industries, the demands of various industries on low-speed, low-cost, wide-coverage and large-capacity services are rapidly expanded, in the PBCH sending scheme of the LTE private network system, PBCH only occupies 4 radio frames within 1 TTI to send coded system broadcast messages, and in extreme environments (high signal-to-noise ratio and the like), the demodulation performance of PBCH channels is insufficient, so that the detection success rate of PBCH detected by a mobile terminal is low.
Therefore, how to increase the detection success rate of PBCH detected by the mobile terminal is an urgent problem to be solved.
Disclosure of Invention
To solve the problems in the prior art, embodiments of the present invention provide a processing method and an apparatus for sending a PBCH.
In a first aspect, an embodiment of the present invention provides a processing method for sending a PBCH, where the method includes:
averagely distributing the coded system broadcast messages to M PBCHs in a broadcast subband, wherein the occupation ratio of the M PBCHs in the broadcast subband is more than 50%;
and sequentially transmitting each PBCH, wherein each PBCH occupies one radio frame.
In a second aspect, an embodiment of the present invention provides an apparatus for transmitting a PBCH, where the apparatus includes:
the system comprises an allocation unit, a receiving unit and a processing unit, wherein the allocation unit is used for averagely allocating the coded system broadcast messages to M PBCHs in a broadcast subband, and the occupation ratio of the M PBCHs in the broadcast subband is more than 50%;
a sending unit, configured to send each PBCH in sequence, where each PBCH occupies one radio frame.
In a third aspect, an embodiment of the present invention provides another apparatus for sending a PBCH, including: a processor, a memory, and a bus, wherein,
the processor and the memory are communicated with each other through the bus;
the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform a method comprising:
averagely distributing the coded system broadcast messages to M PBCHs in a broadcast subband, wherein the occupation ratio of the M PBCHs in the broadcast subband is more than 50%;
and sequentially transmitting each PBCH, wherein each PBCH occupies one radio frame.
In a fourth aspect, an embodiment of the present invention provides a non-transitory computer-readable storage medium, including:
the non-transitory computer readable storage medium stores computer instructions that cause the computer to perform a method comprising:
averagely distributing the coded system broadcast messages to M PBCHs in a broadcast subband, wherein the occupation ratio of the M PBCHs in the broadcast subband is more than 50%;
and sequentially transmitting each PBCH, wherein each PBCH occupies one radio frame.
The processing method and the processing device for sending the PBCH can improve the detection success rate of the PBCH detected by the mobile terminal.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of PBCH transmission by a BCH after coding in the prior art;
fig. 2 is a flowchart illustrating a processing method for sending a PBCH according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of PBCH transmission by BCH after coding according to the embodiment of the present invention;
fig. 4 is a schematic structural diagram of an apparatus for transmitting a PBCH according to an embodiment of the present invention;
fig. 5 is a schematic physical structure diagram of an apparatus according to an 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 and completely 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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 2 is a flowchart illustrating a processing method for sending a PBCH according to an embodiment of the present invention, and as shown in fig. 2, the processing method for sending the PBCH according to the embodiment of the present invention includes the following steps:
s1: and averagely distributing the coded system broadcast messages into M PBCHs in broadcast sub-bands, wherein the occupation ratio of the M PBCHs in the broadcast sub-bands is more than 50%.
Specifically, the apparatus equally allocates the encoded system broadcast message to M PBCHs in a broadcast subband, wherein a ratio of the M PBCHs in the broadcast subband is greater than 50%. Cyclic Redundancy Check (CRC) and coding may be performed on the system broadcast message in advance, which is a mature technology and will not be described in detail. The broadcast sub-band occupies a section of frequency domain resource, and may carry PBCH, PSS, etc. As an example (see fig. 1): in fig. 1, there are 4 PBCHs in the broadcast sub-band, assuming that frequency domain resources occupied by each PBCH are m, frequency domain resources occupied by the corresponding 4 PBCHs are 4m, and frequency domain resources occupied by each PSS are m, the frequency domain resources of the broadcast sub-band are completely occupied by the 4 PBCHs and the 4 PSS, and the occupation ratio of the 4 PBCHs in the broadcast sub-band is 4m/8m, which is 50%, that is, the frequency domain resources N of the broadcast sub-band is 8 m; the frequency domain resources occupied by the M PBCHs in the embodiment of the present invention are Mm, and correspondingly, the occupation ratio of the M PBCHs in the broadcast subband is Mm/N, where the value of Mm/N is greater than 50%, which can ensure that the occupation ratio of the PBCH in the broadcast subband in the embodiment of the present invention is higher than that of the PBCH in the prior art scheme in fig. 1.
S2: and sequentially transmitting each PBCH, wherein each PBCH occupies one radio frame.
Specifically, the apparatus sequentially transmits each PBCH, wherein each PBCH occupies one radio frame. Fig. 3 is a schematic diagram of sending PBCH by BCH after encoding in the embodiment of the present invention, as shown in fig. 3, M PBCHs occupy 15M of frequency domain resources, N occupies 16M of frequency domain resources, and the corresponding occupation ratio of M PBCHs is 15/16.75%, which is much higher than the occupation ratio of 4 PBCHs in fig. 1 by 50%, and the encoded system broadcast message is evenly distributed to 15 PBCHs, and then the 15 PBCHs are sent in sequence, and each PBCH occupies one radio frame, that is, the encoded system broadcast message is sent by occupying 15 radio frames. Due to the improvement of the PBCH occupation ratio, the detection success rate of the PBCH detected by the mobile terminal is improved.
The processing method for sending the PBCH can improve the detection success rate of the PBCH detected by the mobile terminal.
On the basis of the above embodiment, the M PBCHs are consecutively arranged in the broadcast subband.
Specifically, in the apparatus, the M PBCHs are consecutively arranged in the broadcast subband. Referring to fig. 3, 15 PBCHs are consecutively arranged in the broadcast sub-band, i.e., there are no other channels such as PSS between the 15 PBCHs.
The processing method for sending the PBCH provided by the embodiment of the invention is beneficial to continuously sending the M PBCHs by continuously arranging the M PBCHs in the broadcast sub-band, thereby further improving the detection success rate of the PBCH detected by the mobile terminal.
On the basis of the above embodiment, the method further includes:
before each PBCH is sent in sequence, identification information is sent to be used by the mobile terminal to identify each PBCH, wherein the identification information is arranged before the first PBCH in the M PBCHs and occupies a radio frame.
Specifically, the apparatus sends identification information before sending each PBCH in sequence, so that the mobile terminal can identify each PBCH, wherein the identification information is arranged before a first PBCH of the M PBCHs and occupies a radio frame. It should be noted that: the identification information occupies one radio frame and is sent to the mobile terminal, then M PBCH (occupying 15 radio frames) are sent to the mobile terminal in sequence, and the mobile terminal can identify which one of M PBCH is currently received by analyzing the identification information.
The processing method for sending the PBCH enables the mobile terminal to identify each PBCH.
On the basis of the above embodiment, the method further includes:
and after the M PBCH is sent, repeating the steps of sequentially sending the first PBCH to the M PBCH for p times.
Specifically, after the device completes the sending of the mth PBCH, the device repeatedly executes p times the steps of sequentially sending the first PBCH to the mth PBCH. Referring to the above embodiment, when the transmission of the mth PBCH is completed, the first to mth PBCHs are repeatedly transmitted p times, and the time interval required for completing the p times of repeated transmission is 1 TTI, comparing with fig. 1, the TTI in fig. 1 has a value of 8 × 25ms to 200 ms; referring to fig. 3, when the number of the TTI is (for example, p is 7, that is, the TTI is repeated 7 times), the time consumed for the whole TTI is 25ms 16 ms 8 3200ms, which is significantly improved compared with the original TTI of 200ms, thereby being more beneficial to improving the detection success rate of the PBCH detected by the mobile terminal.
The processing method for sending the PBCH provided by the embodiment of the invention obviously increases TTI (transmission time interval) by repeatedly executing the steps of sending the first PBCH to the Mth PBCH for p times, and further improves the detection success rate of the PBCH detected by the mobile terminal.
On the basis of the foregoing embodiment, before forming a radio frame subset by using M radio frames and one radio frame occupied by the identification information, and repeatedly sending the identification information and M PBCHs by using the radio frame subset, the method further includes:
scrambling the encoded system broadcast message.
Specifically, the apparatus scrambles the encoded system broadcast message. N-bit radio frame number information can be generated in the scrambling process, n is a natural number greater than 1, and the value of p (the maximum number of repeated executions) can be determined according to the value of n, so that the maximum number of repeated executions can be adjusted by adjusting the value of n, and the specific mode is as follows: the value of p is obtained by subtracting 1 from the value of n to the power of 2, for example: when n is 2, the power 2 of 2 is 4, 4-1-3 is taken as the numerical value of p, when n is 3, the power 3 of 2 is 8, and 8-1-7 is taken as the numerical value of p, and in the embodiment of the invention, the value of p is 7 (repeated transmission is carried out for 7 times), namely, the radio frame group is transmitted for 8 times in total, and the value range of p is 0-7.
And transmitting different scrambling sequences to radio frame subgroups with different transmission times.
Specifically, the device transmits different scrambling sequences to radio frame subgroups with different transmission times. It should be noted that: the same coded system broadcast message is sent to the radio frame sub-groups with different sending times, but different scrambling sequences are sent to the mobile terminal, and the mobile terminal receives the scrambling sequences and can acquire the true value of the current p (representing the repeated sending times of the repeatedly sent radio frame sub-groups) through analysis.
In the processing method for sending the PBCH provided in the embodiment of the present invention, different scrambling sequences are sent to radio frame subgroups with different sending times, so that the mobile terminal obtains the times of repeatedly sending the radio frame subgroups by analyzing the scrambling sequences.
On the basis of the above embodiment, the scrambling sequence is:
wherein, cinit,pIs the scrambling sequence, p is the number of repeated transmissions,
Is a cell identity.
Specifically, the scrambling sequence in the device is as follows:
wherein, cinit,pIs the scrambling sequence, p is the number of repeated transmissions,
Is a cell identity. It should be noted that: the value of p may be one of 0 to 7, that is, the value of p corresponding to the first sending radio frame group is 0 (repeat 0), the value of p corresponding to the second sending radio frame group is 1 (repeat 1), and so on, the mobile terminal may obtain the number of times of repeatedly sending radio frame groups by analyzing the real value of the current p in the above formula.
According to the processing method for sending the PBCH provided by the embodiment of the invention, the mobile terminal can acquire the times of repeatedly sending the radio frame subgroup by analyzing the real value of the current p in the scrambling sequence through the scrambling sequence.
On the basis of the above embodiment, the value of p in the scrambling sequence is determined by n-bit radio frame number information, n is a natural number greater than 1, and the n-bit radio frame number information is generated when the encoded system broadcast message is scrambled.
Specifically, the value of p in the scrambling sequence in the device is determined by n-bit radio frame number information, n is a natural number greater than 1, and the n-bit radio frame number information is generated when scrambling the encoded system broadcast message. Reference may be made to the above embodiments, which are not described in detail.
The processing method for sending the PBCH determines the value of p through the n-bit radio frame number information, and can more flexibly select the repeated sending times of the radio frame subgroup.
The method for transmitting the PBCH after scrambling comprises the following steps:
(1) evenly distributing the scrambling sequence (p ═ 0) into M parts;
(2) combining each scrambling sequence with each PBCH in the M PBCHs one by one, firstly sending identification information, wherein the identification information is used for identifying the M PBCHs for a mobile terminal to identify, and then sequentially sending each PBCH after combination;
(3) after M PBCH are sent by adopting a radio frame subgroup (consisting of M +1 radio frames), taking a scrambling sequence obtained by adding 1 to the value of p as an updated scrambling sequence, and replacing the scrambling sequence with the updated scrambling sequence;
(4) repeatedly performing the steps between averagely allocating the updated scrambling sequence (updated is the true value of the current p) to M shares and replacing the scrambling sequence with the updated scrambling sequence;
(5) until the value of p reaches the value of p determined by the n-bit radio frame number information (p-7).
It should be noted that: after the mobile terminal finishes sending M PBCH by adopting a radio frame subgroup, each scrambling sequence in the M PBCH is assembled into a complete scrambling sequence, and the complete scrambling sequence is analyzed to obtain the real value of the current p, so that the repeated sending times of the current radio frame subgroup are obtained.
Fig. 4 is a schematic structural diagram of an apparatus for sending a PBCH according to an embodiment of the present invention, and as shown in fig. 4, an apparatus for sending a PBCH according to an embodiment of the present invention includes an allocating unit 1 and a sending unit 2, where:
the allocating unit 1 is configured to equally allocate the encoded system broadcast message to M PBCHs in a broadcast subband, where a ratio of the M PBCHs in the broadcast subband is greater than 50%; the sending unit 2 is configured to send each PBCH in turn, where each PBCH occupies one radio frame.
Specifically, the allocating unit 1 is configured to equally allocate the encoded system broadcast message to M PBCHs in a broadcast subband, where a ratio of the M PBCHs in the broadcast subband is greater than 50%; the sending unit 2 is configured to send each PBCH in turn, where each PBCH occupies one radio frame.
The device for sending the PBCH can improve the detection success rate of the PBCH detected by the mobile terminal.
The apparatus for sending a PBCH according to the embodiment of the present invention may be specifically configured to execute the processing procedure of each of the method embodiments, and its functions are not described herein again, and refer to the detailed description of the method embodiments.
Fig. 5 is a schematic physical structure diagram of an apparatus according to an embodiment of the present invention, and as shown in fig. 5, the apparatus includes: a processor (processor)501, a memory (memory)502, and a bus 503;
the processor 501 and the memory 502 complete communication with each other through a bus 503;
the processor 501 is configured to call program instructions in the memory 502 to perform the methods provided by the above-mentioned method embodiments, for example, including: averagely distributing the coded system broadcast messages to M PBCHs in a broadcast subband, wherein the occupation ratio of the M PBCHs in the broadcast subband is more than 50%; and sequentially transmitting each PBCH, wherein each PBCH occupies one radio frame.
The present embodiment discloses a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform the method provided by the above-mentioned method embodiments, for example, comprising: averagely distributing the coded system broadcast messages to M PBCHs in a broadcast subband, wherein the occupation ratio of the M PBCHs in the broadcast subband is more than 50%; and sequentially transmitting each PBCH, wherein each PBCH occupies one radio frame.
The present embodiments provide a non-transitory computer-readable storage medium storing computer instructions that cause the computer to perform the methods provided by the above method embodiments, for example, including: averagely distributing the coded system broadcast messages to M PBCHs in a broadcast subband, wherein the occupation ratio of the M PBCHs in the broadcast subband is more than 50%; and sequentially transmitting each PBCH, wherein each PBCH occupies one radio frame.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
The above-described embodiments of the apparatuses and the like are merely illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention, and are not limited thereto; although embodiments of the present invention have been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A processing method for transmitting PBCH is characterized by comprising the following steps:
averagely distributing the coded system broadcast messages to M PBCHs in a broadcast subband, wherein the occupation ratio of the M PBCHs in the broadcast subband is more than 50%;
and sequentially transmitting each PBCH, wherein each PBCH occupies one radio frame.
2. The method of claim 1, wherein the M PBCH are consecutively arranged in the broadcast subband.
3. The method according to claim 1 or 2, characterized in that the method further comprises:
before each PBCH is sent in sequence, identification information is sent to be used by the mobile terminal to identify each PBCH, wherein the identification information is arranged before the first PBCH in the M PBCHs and occupies a radio frame.
4. The method of claim 3, further comprising:
and after the M PBCH is sent, repeating the steps of sequentially sending the first PBCH to the M PBCH for p times.
5. The method of claim 4, wherein M radio frames and one radio frame occupied by the identification information are grouped into a radio frame subset, and wherein the method further comprises, before the identification information and M PBCH are repeatedly transmitted using the radio frame subset:
scrambling the encoded system broadcast message;
and transmitting different scrambling sequences to radio frame subgroups with different transmission times.
6. The method of claim 5, wherein the scrambling sequence is:
wherein, cinit,pIs the scrambling sequence, p is the number of repeated transmissions, and p has an initial value of zero,
Is a cell identity.
7. The method of claim 6, wherein the value of p in the scrambling sequence is determined by n-bit radio frame number information, n being a natural number greater than 1, the n-bit radio frame number information being generated when scrambling the encoded system broadcast message.
8. An apparatus for transmitting PBCH, comprising:
the system comprises an allocation unit, a receiving unit and a processing unit, wherein the allocation unit is used for averagely allocating the coded system broadcast messages to M PBCHs in a broadcast subband, and the occupation ratio of the M PBCHs in the broadcast subband is more than 50%;
a sending unit, configured to send each PBCH in sequence, where each PBCH occupies one radio frame.
9. An apparatus for transmitting PBCH, comprising: a processor, a memory, and a bus, wherein,
the processor and the memory are communicated with each other through the bus;
the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the method of any of claims 1 to 7.
10. A non-transitory computer-readable storage medium storing computer instructions that cause a computer to perform the method of any one of claims 1 to 7.
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