CN111052820B - System message transmission method and network equipment - Google Patents
System message transmission method and network equipment Download PDFInfo
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- CN111052820B CN111052820B CN201780094491.2A CN201780094491A CN111052820B CN 111052820 B CN111052820 B CN 111052820B CN 201780094491 A CN201780094491 A CN 201780094491A CN 111052820 B CN111052820 B CN 111052820B
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Abstract
A method for transmitting system messages and network equipment are used for solving the problems of poor demodulation performance and long demodulation time of SIB1-NB in the prior art. The method comprises the following steps: the network equipment generates a first system message; the network device sends the first system message to a terminal device through a first channel in a first time period, wherein the first system message and a second system message sent to the terminal device by the network device through the first channel in the first time period are scrambled by adopting different scrambling methods and/or resource mapping is carried out by adopting different resource mapping methods.
Description
Technical Field
The present application relates to the field of information technologies, and in particular, to a method for transmitting system messages and a network device.
Background
In an internet of things (IoT) system, some common and important configuration information is placed in a System Information (SI). The IoT system includes a narrowband base internet of things (NB-IoT) system, and the NB-IoT system defines various system messages including a Master Information Block (MIB) -NB, a System Information Block (SIB) 1-NB, a SIB2-NB, and the like, wherein the SIB1-NB contains cell access and cell selection related parameters and is a system message necessary for terminals in a cell.
In order to improve the demodulation performance of the SIB1-NB and reduce the acquisition time of the SIB1-NB, the 3rd generation mobile communication standardization organization (3 GPP) has agreed to use additional resources for transmission of the SIB 1-NB. Specifically, the SIB1-NB transmitted in subframe 4 is referred to as the existing (legacy) SIB1-NB, and the newly added SIB1-NB transmitted in subframe 3 is referred to as the new (new) SIB 1-NB. The content carried by the new SIB1-NB is the same as that carried by the legacy SIB1-NB, and the new SIB1-NB and the legacy SIB1-NB are in the same radio frame; transport Block Size (TBS), coding scheme, and modulation scheme of new SIB1-NB are consistent with legacy SIB 1-NB.
However, if the new SIB1-NB and the legacy SIB1-NB adopt the same scrambling method, when there is SIB1-NB interference of other cells, the terminal may combine the interfering SIB1-NB in phase during demodulation, which results in increased interference power and affects demodulation performance. In addition, if the new SIB1-NB and the legacy SIB1-NB adopt the same resource mapping mode, even if the user coverage is better, the SIB1-NB can be obtained only after the information on 8 radio frames is correctly demodulated, and the demodulation time is not reduced.
In summary, how to transmit the new SIB1-NB to better improve the demodulation performance of the SIB1-NB and reduce the acquisition time of the SIB1-NB is a problem to be solved at present.
Disclosure of Invention
The embodiment of the application provides a method and network equipment for transmitting system messages, which improve the SIB1-NB demodulation performance and reduce SIB1-NB demodulation time.
In a first aspect, the present application provides a method for system message transmission, where the method includes: the network equipment generates a first system message; the network device sends the first system message to a terminal device through a first channel in a first time period, wherein the first system message and a second system message sent to the terminal device by the network device through the first channel in the first time period are scrambled by adopting different scrambling methods and/or resource mapping is carried out by adopting different resource mapping methods.
By the method, because the scrambling modes of the first system message and the second system message are different, the adjacent cell interference resistance is increased, the demodulation performance of the SIB1-NB is improved, the resource mapping modes of the first system message and the second system message are different, the terminal equipment can obtain a complete SIB1-NB without receiving 8 complete subframes, and the demodulation time is reduced.
In one possible design, the first time period is 16 consecutive radio frames.
In one possible design, the first system message is transmitted on subframe 3 of every other frame in the first time period, and the second system message is transmitted on subframe 4 of every other frame in the first time period.
In one possible design, before the network device sends the first system message to the terminal device through the first channel within the first time period, the method further includes: the network equipment sends indication information to the terminal equipment, wherein the indication information is used for indicating at least one of the following items: and the network equipment sends the first system message, the scrambling mode of the first system message and the resource mapping mode of the first system message.
By the method, whether the first system message exists in the terminal equipment is informed in advance through the indication information.
In one possible design, the scrambling of the first system message with a second system message sent by the network device to the terminal device through the first channel in the first time period is performed in a different scrambling manner, and the scrambling includes: scrambling the first system message by adopting a bit-level scrambling mode; scrambling the second system message by adopting a bit level scrambling mode; when the first system message and the second system message are subjected to bit-level scrambling, the initialization seed generation formula of the used scrambling codes is different.
By the method, the first system message and the second system message use different bit-level scrambling codes, and the anti-interference performance is improved.
In one possible design, the scrambling of the first system message with a second system message sent by the network device to the terminal device through the first channel in the first time period is performed in a different scrambling manner, and the scrambling includes: scrambling the first system message by adopting a bit level scrambling mode and a symbol level scrambling mode; scrambling the second system message by adopting a bit level scrambling mode; when the first system message and the second system message are subjected to bit-level scrambling, the initialization seed generation formula of the used scrambling codes is the same.
By the method, the first system message adopts bit level scrambling and symbol level scrambling, and the anti-interference performance is further improved.
In one possible design, the resource mapping refers to a process of mapping a set of modulation symbols of a transport block corresponding to the first system message or the second system message to a set of available resources of the first system message or the second system message.
In one possible design, the set of available resources for the first system message refers to a set of subframes 3 for every other frame in the first time period, and the set of available resources for the second system message refers to a set of subframes 4 for every other frame in the first time period.
In one possible design, the resource mapping between the first system message and a second system message sent by the network device to the terminal device through the first channel in the first time period is performed in different resource mapping manners, including: performing resource mapping on a set of available resources of the first system message by adopting a first sequence for a set of modulation symbols of a transmission block corresponding to the first system message; performing resource mapping on the available resource set of the second system message by adopting a second sequence for the modulation symbol set of the transmission block corresponding to the second system message; wherein the first order and the second order are different.
By the method, the first system message and the second system message use different resource mapping modes, and the demodulation time is reduced.
In a second aspect, the present application provides a network device, comprising: a processing unit for generating a first system message;
a sending unit, configured to send the first system message to a terminal device through a first channel in a first time period, where the first system message and a second system message sent by the network device to the terminal device through the first channel in the first time period are scrambled using different scrambling methods and/or resource mapping is performed using different resource mapping methods.
In one possible design, the first time period is 16 consecutive radio frames.
In one possible design, the first system message is transmitted on subframe 3 of every other frame in the first time period, and the second system message is transmitted on subframe 4 of every other frame in the first time period.
In one possible design, the sending unit is further configured to:
sending indication information to the terminal equipment, wherein the indication information is used for indicating at least one of the following items: and the network equipment sends the first system message, the scrambling mode of the first system message and the resource mapping mode of the first system message.
In one possible design, the scrambling of the first system message with a second system message sent by the network device to the terminal device through the first channel in the first time period is performed in a different scrambling manner, and the scrambling includes:
scrambling the first system message by adopting a bit-level scrambling mode;
scrambling the second system message by adopting a bit level scrambling mode;
when the first system message and the second system message are subjected to bit-level scrambling, the initialization seed generation formula of the used scrambling codes is different.
In one possible design, the first system message and a second system message sent by the network device to the terminal device through the first channel in the first time period are scrambled using different scrambling methods, further including:
scrambling the first system message by adopting a bit level scrambling mode and a symbol level scrambling mode;
scrambling the second system message by adopting a bit level scrambling mode;
when the first system message and the second system message are subjected to bit-level scrambling, the initialization seed generation formula of the used scrambling codes is the same.
In one possible design, the resource mapping refers to a process of mapping a set of modulation symbols of a transport block corresponding to the first system message or the second system message to a set of available resources of the first system message or the second system message.
In one possible design, the set of available resources for the first system message refers to a set of subframes 3 for every other frame in the first time period, and the set of available resources for the second system message refers to a set of subframes 4 for every other frame in the first time period.
In one possible design, the resource mapping between the first system message and a second system message sent by the network device to the terminal device through the first channel in the first time period is performed in different resource mapping manners, including:
performing resource mapping on a set of available resources of the first system message by adopting a first sequence for a set of modulation symbols of a transmission block corresponding to the first system message;
performing resource mapping on the available resource set of the second system message by adopting a second sequence for the modulation symbol set of the transmission block corresponding to the second system message;
wherein the first order and the second order are different.
In a third aspect, an embodiment of the present application further provides a network device, including a processor, a memory, and a transmitter, where the memory is used to store a software program, and the processor is used to read the software program stored in the memory and implement the method provided in the first aspect or any one of the designs of the first aspect.
In a fourth aspect, this embodiment of the present application further provides a computer-readable medium, where a software program is stored, and when the software program is read and executed by one or more processors, the software program may implement the method provided by the first aspect or any one of the designs of the first aspect.
Drawings
Fig. 1 is a schematic diagram of transmission of an SIB1-NB according to an embodiment of the present disclosure;
FIG. 2 is a diagram of a new SIB1-NB and a legacy SIB1-NB transmitting on subframes according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for transmitting a system message according to an embodiment of the present application;
FIG. 4 is a diagram of another new SIB1-NB and legacy SIB1-NB transmitting on subframes according to an embodiment of the present application;
fig. 5 is a schematic diagram of a network device according to an embodiment of the present application;
fig. 6 is a schematic diagram of a hardware structure of a network device according to an embodiment of the present application.
Detailed Description
Embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
The present application may be applied to a Long Term Evolution (LTE) system, and may also be applied to other wireless communication systems, such as a global system for mobile communications (GSM), a mobile communication system (UMTS), a Code Division Multiple Access (CDMA) system, a new network system, and the like. The network device may also be referred to as a base station, and is a device deployed in a radio access network to provide a wireless communication function for the terminal device. For example, the network devices may include various forms of macro base stations, micro base stations, relay stations, access points, and so on. In systems using different radio access technologies, the names of devices with base station functionality may differ, for example in LTE systems, called evolved node bs (enbs or enodebs). For convenience of description, in the embodiments of the present application, the above-mentioned apparatuses providing a wireless communication function for a terminal device are collectively referred to as a network device. It should be noted that, when the scheme of the embodiment of the present application is applied to a 5G system or other systems that may appear in the future, names of network devices and terminal devices may change, but this does not affect implementation of the scheme of the embodiment of the present application.
The terminal device (terminal device) related to the embodiments of the present application may include various handheld devices, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem, and various forms of User Equipment (UE), Mobile Stations (MS), and so on. For convenience of description, the above-mentioned devices are collectively referred to as terminal devices.
The plural in the present application means two or more.
In addition, it is to be understood that the terms first, second, etc. in the description of the present application are used for distinguishing between the descriptions and not necessarily for describing a sequential or chronological order.
In the existing solution, taking an NB-IoT system as an example, in the NB-IoT system, some common and relatively important configuration information may be placed in a System Information (SI), an MIB is transmitted on a Physical Broadcast Channel (PBCH), and an SIB is transmitted on a Physical Downlink Shared Channel (PDSCH). To distinguish from LTE systems, MIB and SIB information in NB-IoT systems end with an "-NB" suffix. NB-IoT defines a variety of system messages including MIB-NB, SIB1-NB, SIB2-NB, and the like. The SIB1-NB contains parameters related to cell access and cell selection, and is a system message necessary for the terminal device.
In an NB-IoT system, legacy SIB1-NB is transmitted on a Narrowband Physical Downlink Shared Channel (NPDSCH), a scheduling period of the legacy SIB1-NB is fixed to 2560ms, 1 legacy SIB1-NB Transport Block (TB) may be repeatedly transmitted at equal intervals in 1 scheduling period after being coded and modulated, and each repetition is transmitted on subframe 4 of every other frame in 16 consecutive frames. I.e. over 8 radio frames, each 10ms long, as shown in particular in fig. 1. When the Legacy SIB1-NB is transmitted, bit level scrambling is adopted, and the generation formula of the scrambling code initialization seed is as follows:
wherein, cinitFor initialising the seed of the scrambling code, nRNTIIs a Radio Network Temporary Identifier (RNTI), and for system messages, the RNTI is specifically a system message RNTI (SI-RNTI),
is cell identity, nfIs the radio frame number.
In order to improve the demodulation performance of the SIB1-NB and reduce the acquisition time of the SIB1-NB, the standardization organization 3GPP has agreed that the SIB1-NB may be transmitted using additional resources, specifically, the SIB1-NB transmitted in subframe 4 is referred to as an existing (legacy) SIB1-NB, the SIB1-NB newly transmitted in subframe 3 is referred to as a new (new) SIB1-NB, and the new SIB1-NB is in the same radio frame as the legacy SIB 1-NB.
In the existing scheme, the content, Transport Block Size (TBS), coding scheme, modulation scheme, scrambling scheme, and resource mapping scheme carried by the newly added new SIB1-NB are the same as the legacy SIB1-NB, where resource mapping refers to a process in which a modulation symbol set of 1 legacy SIB1-NB Transport Block (TB) or a legacy SIB1-NB TB is transmitted in a certain order (e.g., 12345678) over 8 subframes within 16 consecutive frames, and the resource mapping schemes of the new SIB1-NB and the legacy SIB1-NB are the same, and both the modulation symbol sets of the legacy SIB1-NB TB or the legacy SIB1-NB are sequentially transmitted over 8 subframes within 16 consecutive frames, as shown in fig. 2 specifically.
Therefore, in the existing scheme, the scrambling mode of the new SIB1-NB is the same as that of the legacy SIB1-NB, the adjacent cell interference resistance is poor, the demodulation performance is affected, the resource mapping mode of the new SIB1-NB is the same as that of the legacy SIB1-NB, even if the user coverage is better, the complete SIB1-NB can be obtained only after the information on 8 radio frames is correctly demodulated, and the demodulation time is not reduced.
In view of the above, the present application provides a method for improving the demodulation performance of the SIB1-NB and reducing the demodulation time of the SIB 1-NB. Generating a first system message through a network device, and sending the first system message to a terminal device through a first channel in a first time period, wherein the first system message and a second system message sent to the terminal device by the network device through the first channel in the first time period are scrambled by adopting different scrambling methods, and/or resource mapping is carried out by adopting different resource mapping methods. By the scheme, the demodulation performance of the SIB1-NB can be improved, and the demodulation time is reduced.
Referring to fig. 3, a flowchart of a method for transmitting a system message is provided. The method comprises the following steps:
s301, the network equipment generates a first system message.
Wherein, the first system message may be referred to as a new SIB 1-NB.
S302, the network device sends the first system message to a terminal device through a first channel in a first time period, wherein the first system message and a second system message sent to the terminal device by the network device through the first channel in the first time period are scrambled by adopting different scrambling methods, and/or resource mapping is carried out by adopting different resource mapping methods.
Wherein the second system message may be referred to as legacy SIB 1-NB. The first Channel may be NPDSCH, or may be a Narrowband Physical Broadcast Channel (NPBCH), a Narrowband Physical Downlink Control Channel (NPDCCH), or the like.
In the embodiment of the application, by the method for transmitting the system messages, because the scrambling modes of the first system messages and the second system messages are different, the adjacent cell interference resistance is increased, the demodulation performance of the SIB1-NB is improved, the resource mapping modes of the first system messages and the second system messages are different, the terminal equipment can obtain the complete SIB1-NB without receiving the complete 8 subframes, and the demodulation time is reduced.
Before the network device sends the first system message to a terminal device through a first channel within a first time period, the network device may further send indication information to the terminal device, where the indication information is used to indicate at least one of: and the network equipment sends the first system message, the scrambling mode of the first system message and the resource mapping mode of the first system message.
The above scheme is explained in detail below by two specific examples.
In a first embodiment, the scrambling of the first system message and the second system message sent by the network device to the terminal device through the first channel in the first time period is performed by using different scrambling manners, which includes two cases:
in the first case, the first system message is scrambled by using a bit-level scrambling method, the second system message is also scrambled by using a bit-level scrambling method, and the generation formulas of the initialization seeds of the used scrambling codes are different when the first system message and the second system message are subjected to bit-level scrambling.
Specifically, when bit-level scrambling is performed on the new SIB1-NB, a scrambling code used for scrambling is generated according to the initialization seed, and a binary generation formula of the initialization seed for bit-level scrambling of the new SIB1-NB is generated according to time information and a first variable group, where the time information is a radio frame number or a value obtained by modulo a first modulus by the radio frame number, the first variable group includes at least one of a radio network temporary identifier, a cell identifier, a slot number, and a carrier identifier, and the first modulus is a positive integer, and preferably may be a prime number or an integer power of 2. The scrambling mode of legacy SIB1-NB is well defined by the standard.
For example, the following steps are carried out: the function of the binary generation formula for the initialization seed can be expressed as:
wherein, cinitIs the initialized seed of the scrambling code, nf is the radio frame number, k is a positive integer less than or equal to the maximum value of the radio frame number,
is cell identity, nRNTIFor the radio network temporary identifier, the RNTI is specifically a system message RNTI (SI-RNTI), and F generally refers to a function mapping relationship, as follows. Preferably, k may take prime numbers such as 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, and the like. k may also be an integer power of 2, such as 2, 4, 8, 16, 32, 64, 128, 256, 512, etc. For example, a binary generation formula for initializing the seed may be:
where x, y, z are non-negative integers, b is the number of binary bits used or occupied by z, and a is
The number of binary bits used or occupied; or may be:
where x, y, z are non-negative integers, d is the number of binary bits used or occupied by z, and c is nRNTI·2d+ z number of binary bits used or occupied; or may be:
where x, y, z are non-negative integers, g is the number of binary bits used or occupied by z, and f is the number of binary bits used or occupied by ((nf mod k) + y). 2g + zA number e is
The number of binary bits used or occupied; or may be:
where x, y, z are non-negative integers, j is the number of binary bits used or occupied by z, and i is
Number of binary bits used or occupied, h being
The number of binary bits used or occupied. Preferably, x, y, z can take the values 0, 1, 2, 3, 4, 5, etc. The binary generation formula of the initialization seed may be inter-modulated in high and low order, which is not limited in the present application.
Optionally, the specific process of the bit-level scrambling includes encoding a system information transmission block, and performing modulo-2 addition on the encoded system information bit sequence and a bit-level scrambling code sequence with the same length, where the bit-level scrambling code sequence is a bit sequence generated according to a binary generation formula of an initialization seed of the bit-level scrambling.
With the first embodiment, the interference of the neighboring cells can be randomized by different bit-level scrambling codes of the new SIB1-NB and the legacy SIB1-NB in the same radio frame and different bit-level scrambling codes of the new SIB1-NB and the legacy SIB 1-NB. Specifically, after receiving the new SIB1-NB and legacy SIB1-NB, the terminal device performs bit-level descrambling, and then performs descrambling using different scrambling codes for the new SIB1-NB and legacy SIB1-NB carrying the same information. Therefore, after bit-level descrambling is carried out, the new SIB1-NB and the legacy SIB1-NB carrying the same information can be coherently combined to improve the signal power, and the corresponding interference signals become non-in-phase signals, so that the power of the interference signals remains unchanged after superposition, thereby enhancing the anti-interference performance of the SIB1-NB and improving the demodulation performance of the SIB 1-NB.
In this case, the resource mapping manners of the new SIB1-NB and the legacy SIB1-NB may be the same or different, and are not limited in the present application.
In case two, the first system message is scrambled by adopting a bit level scrambling mode and a symbol level scrambling mode; scrambling the second system message only by adopting a bit-level scrambling mode; when the first system message and the second system message are subjected to bit-level scrambling, the initialization seed generation formulas of the used scrambling codes are the same, namely, the initialization seed generation formulas specified by the standard are used for the first system message and the second system message when the first system message and the second system message are subjected to bit-level scrambling
In particular, the binary generation formula for the bit-level scrambled initialization seed of legacy SIB1-NB is standard. The binary generation formula of the symbol-level scrambled initialization seed of the new SIB1-NB is the same as the binary generation formula of the bit-level scrambled initialization seed of the new SIB1-NB in case one, and the binary generation formula of the symbol-level scrambled initialization seed of the new SIB1-NB may also take other forms, which is not limited in the present application.
Optionally, the specific process of the symbol-level scrambling includes performing operations such as encoding and modulating on a system information transmission block to obtain a system information modulation symbol sequence, and performing element-by-element multiplication on the system information modulation symbol sequence and a segment of symbol-level scrambling code sequence with the same length, where the generation process of the symbol-level scrambling code sequence is: a section of bit sequence is generated according to a binary generation formula of the initialization seed scrambled at a symbol level, and then the bit sequence is converted into a section of complex sequence.
Through the second embodiment, the bit-level scrambling modes of the new SIB1-NB and the legacy SIB1-NB, and the new SIB1-NB and the legacy SIB1-NB in the same radio frame are consistent, but the new SIB1-NB performs symbol-level scrambling in addition to the bit-level scrambling, and different from the legacy SIB1-NB, the interference of neighboring cells can be randomized, the anti-interference performance of the SIB1-NB is enhanced, and the demodulation performance of the SIB1-NB is improved.
In case two, the resource mapping manners of the new SIB1-NB and the legacy SIB1-NB may be the same or different, and are not limited in the present application.
In a possible case, when the channel variation is small, the terminal device may enable symbol-level coherent combining before channel equalization, that is, after receiving the new SIB1-NB and the legacy SIB1-NB and before performing channel equalization operation, the terminal device performs symbol-level descrambling operation on the received modulation symbols of the new SIB1-NB, and then adds the modulation symbols of the new SIB1-NB and the legacy SIB1-NB which carry the same information, so as to improve the signal power, thereby enhancing the anti-interference performance of the SIB1-NB and improving the demodulation performance of the SIB 1-NB; when the channel change is large, the terminal device may enable symbol-level coherent combining after channel equalization, that is, after receiving the new SIB1-NB and the legacy SIB1-NB, the terminal device performs channel equalization operation first, then performs symbol-level descrambling operation on the received modulation symbol of the new SIB1-NB, and then adds the modulation symbols of the new SIB1-NB and the legacy SIB1-NB which carry the same information, so as to improve the signal power, thereby enhancing the anti-interference performance of the SIB1-NB and improving the demodulation performance of the SIB 1-NB.
In a second specific embodiment, a modulation symbol set of a transmission block corresponding to a first system message performs resource mapping on an available resource set of the first system message in a first order; a modulation symbol set of a transmission block corresponding to a second system message performs resource mapping on an available resource set of the second system message by adopting a second sequence; wherein the first order and the second order are different, and the modulation symbol set is obtained by the transport block through at least one of Cyclic Redundancy Check (CRC), coding, rate matching, scrambling, and modulation. The resource mapping refers to a process of mapping a modulation symbol set of a transmission block corresponding to the first system message or the second system message to an available resource set of the first system message or the second system message, where an available resource in the available resource set is an available subframe, that is, a subframe in which a modulation symbol set of a transmission block corresponding to the first system message or the second system message can be transmitted.
For example, the following steps are carried out: by sets { X0，X1，...，XN-1}、{Y0，Y1，...，YN-1And respectively representing modulation symbol sets of transport blocks corresponding to legacy SIB1-NB and new SIB1-NB, which are arranged in the same order, wherein N represents the total number of modulation symbols. The network device will { X when transmitting legacy SIB1-NB0，X1，...，XN-1The symbol set X is transmitted sequentially on subframe 4 of every other frame (8 radio frames in total) in 16 consecutive frames, i.e. on the ith available subframe of legacy SIB1-NB(i-1)n，X(i-1)n+1，...，X(i-1)n+(n-1)Where i ∈ {1, 2, 3, 4, 5, 6, 7, 8} denotes a sequence number of an available subframe, and N ═ N/8 denotes a total number of modulation symbols transmitted on one available subframe. In the embodiment of the present application, the order in which the network device transmits legacy SIB1-NB, i.e., the second order, is referred to as 12345678. The network device will be Y when transmitting the new SIB1-NB0，Y1，...，YN-1Transmitting on subframe 3 of every other frame (8 radio frames in total) in 16 consecutive frames, the network device adopting a first order pair { Y } different from the second order0，Y1，...，YN-1I.e. the first order may be any one of the full permutations of 1, 2, 3, 4, 5, 6, 7, 8, except 12345678. Preferably, the first order may be 56781234, 87654321, etc. For example, when the first order is 56781234, this indicates that the network device is transmitting the new SIB1-NB on the 1 st available subframe of the new SIB1-NB as the set of modulation symbols { Y }(5-1)n，Y(5-1)n+1，...，Y(5-1)n+(n-1)H, transmitting a set of modulation symbols { Y) on the 2 nd available subframe(6-1)n，Y(6-1)n+1，...，Y(6-1)n+(n-1)In this example, a set of modulation symbols Y is transmitted on the 8 th available subframe(4-1)n，Y(4-1)n+1，...，Y(4-1)n+(n-1)}. In the embodiment of the present application, the second sequence may be {1, 2, 3, 4, 5, 6, 7, 8} in the full arrangement except for 12345678, as long as the first sequence and the second sequence are the sameThe sequences may be different, and the present application does not limit the same.
By adopting different resource mapping modes, the terminal equipment can receive the complete SIB1-NB in less than 8 subframes, and the SIB1-NB demodulation time is reduced. For example, when the network device transmits the resource mappings of the new SIB1-NB and the legacy SIB1-NB in the order of 12345678, the terminal device needs to receive the new SIB1-NB and the legacy SIB1-NB over 8 radio frames at least, and then can successfully demodulate the whole SIB 1-NB. When the network device transmits the new SIB1-NB in the resource mapping order of 56781234 or 87654321, the terminal may only receive the new SIB1-NB and legacy SIB1-NB over 4 radio frames, and may successfully demodulate the entire SIB1-NB, which shortens the demodulation time by half. For example, the following steps are carried out: when legacy SIB1-NB adopts the resource mapping order of 12345678 and new SIB1-NB adopts the resource mapping order of 56781234, the modulation symbol set of new SIB1-NB TB or legacy SIB1-NB TB is transmitted in 8 subframes in 16 consecutive frames, as shown in fig. 4.
In the second embodiment, the scrambling modes of the new SIB1-NB and the legacy SIB1-NB may be the same or different, and the present application does not limit the scrambling modes.
Based on the same inventive concept as the method embodiment, the present application further provides a schematic diagram of a network device, as shown in fig. 5, the network device includes:
a processing unit 501, configured to generate a first system message.
A sending unit 502, configured to send the first system message to a terminal device through a first channel, where the first system message and a second system message sent by the network device to the terminal device through the first channel in the first time period are scrambled by using different scrambling methods, and/or resource mapping is performed by using different resource mapping methods.
In the embodiment of the application, through the network device, because the scrambling modes of the first system message and the second system message are different, the adjacent cell interference resistance is increased, the demodulation performance of the SIB1-NB is improved, the resource mapping modes of the first system message and the second system message are different, the terminal device can obtain a complete SIB1-NB without receiving 8 complete subframes, and the demodulation time is reduced.
Optionally, the sending unit is further configured to: sending indication information to the terminal equipment, wherein the indication information is used for indicating at least one of the following items: and the network equipment sends the first system message, the scrambling mode of the first system message and the resource mapping mode of the first system message.
In the embodiment of the present application, the method and the network device are based on the same inventive concept, and because the principles of solving the problems of the method and the network device are similar, the implementation of the apparatus and the method can be referred to each other, and other repeated parts are not described in detail
The division of the modules in the embodiments of the present application is schematic, and only one logical function division is provided, and in actual implementation, there may be another division manner, and in addition, each functional module in each embodiment of the present application may be integrated in one processor, may also exist alone physically, or may also be integrated in one module by two or more modules. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.
When the integrated module may be implemented in the form of hardware, as shown in fig. 6, the network device may include a processor 601, and the hardware of the entity corresponding to the processing unit 501 may be the processor 601. The network device may further include a transmitter 604, and the hardware of the entity corresponding to the sending unit 502 may be the transmitter 604. The processor 601 may be a Central Processing Unit (CPU), a digital processing module, or the like. The terminal device further includes: a memory 602 for storing programs executed by the processor 601. The memory 602 may be a nonvolatile memory, such as a hard disk (HDD) or a solid-state drive (SSD), and may also be a volatile memory, such as a random-access memory (RAM). The memory 602 is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such.
The processor 601 is configured to execute the program code stored in the memory 602, specifically call the program instruction stored in the memory 602, and generate a first system message through the processor 601; a first system message is sent using a transmitter 604.
The specific connection medium between the processor 601 and the memory 602 is not limited in the embodiments of the present application. In the embodiment of the present application, the processor 601 and the memory 602 are connected by a bus 603 in fig. 6, the bus is represented by a thick line in fig. 6, and the connection manner between other components is merely illustrative and not limited thereto. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 6, but this is not intended to represent only one bus or type of bus.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present application without departing from the spirit and scope of the embodiments of the present application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to encompass such modifications and variations.
Claims (20)
1. A method for system message transmission, the method comprising:
the network equipment generates a first system message;
the network device sends the first system message to a terminal device through a first channel in a first time period, wherein the first system message and a second system message sent to the terminal device by the network device through the first channel in the first time period are scrambled by adopting different scrambling methods, the first system message and the second system message are subjected to resource mapping by adopting different resource mapping methods, and the second system message is scrambled by adopting a bit-level scrambling method.
2. The method of claim 1, wherein the first time period is 16 consecutive radio frames.
3. The method of claim 1 or 2, wherein the first system message is transmitted on subframe 3 of every other frame in the first time period, and wherein the second system message is transmitted on subframe 4 of every other frame in the first time period.
4. The method of claim 1 or 2, wherein prior to the network device sending the first system message to the terminal device over the first channel for the first time period, the method further comprises:
the network equipment sends indication information to the terminal equipment, wherein the indication information is used for indicating at least one of the following items: and the network equipment sends the first system message, the scrambling mode of the first system message and the resource mapping mode of the first system message.
5. The method of claim 1 or 2, wherein the first system message is scrambled with a different scrambling scheme than a second system message sent by the network device to the terminal device over the first channel during the first time period, comprising:
scrambling the first system message by adopting a bit-level scrambling mode;
when the first system message and the second system message are subjected to bit-level scrambling, the initialization seed generation formula of the used scrambling codes is different.
6. The method of claim 1 or 2, wherein the first system message is scrambled with a different scrambling scheme than a second system message sent by the network device to the terminal device over the first channel during the first time period, comprising:
scrambling the first system message by adopting a bit level scrambling mode and a symbol level scrambling mode;
when the first system message and the second system message are subjected to bit-level scrambling, the initialization seed generation formula of the used scrambling codes is the same.
7. The method of claim 1 or 2, wherein the resource mapping refers to a process of mapping a set of modulation symbols of a transport block corresponding to the first system message or the second system message to a set of available resources of the first system message or the second system message.
8. The method of claim 7, wherein the set of available resources for the first system message refers to a set of subframes 3 for every other frame in the first time period, and wherein the set of available resources for the second system message refers to a set of subframes 4 for every other frame in the first time period.
9. The method of claim 1 or 2, wherein the resource mapping between the first system message and a second system message sent by the network device to the terminal device through the first channel in the first time period is performed in a different resource mapping manner, and the method includes:
performing resource mapping on a set of available resources of the first system message by adopting a first sequence for a set of modulation symbols of a transmission block corresponding to the first system message;
performing resource mapping on the available resource set of the second system message by adopting a second sequence for the modulation symbol set of the transmission block corresponding to the second system message;
wherein the first order and the second order are different.
10. A network device, comprising:
a processing unit for generating a first system message;
a sending unit, configured to send the first system message to a terminal device through a first channel in a first time period, where the first system message and a second system message sent by the network device to the terminal device through the first channel in the first time period are scrambled by using different scrambling methods, the first system message and the second system message are resource mapped by using different resource mapping methods, and the second system message is scrambled by using a bit-level scrambling method.
11. The network device of claim 10, wherein the first time period is 16 consecutive radio frames.
12. The network device of claim 10 or 11, wherein the first system message is transmitted on subframe 3 of every other frame in the first time period, and wherein the second system message is transmitted on subframe 4 of every other frame in the first time period.
13. The network device of claim 10 or 11, wherein the sending unit is further configured to:
sending indication information to the terminal equipment, wherein the indication information is used for indicating at least one of the following items: and the network equipment sends the first system message, the scrambling mode of the first system message and the resource mapping mode of the first system message.
14. The network device of claim 10 or 11, wherein the first system message is scrambled with a different scrambling scheme than a second system message sent by the network device to the terminal device over the first channel during the first time period, comprising:
scrambling the first system message by adopting a bit-level scrambling mode;
when the first system message and the second system message are subjected to bit-level scrambling, the initialization seed generation formula of the used scrambling codes is different.
15. The network device of claim 10 or 11, wherein the first system message is scrambled with a different scrambling scheme than a second system message sent by the network device to the terminal device over the first channel during the first time period, further comprising:
scrambling the first system message by adopting a bit level scrambling mode and a symbol level scrambling mode;
when the first system message and the second system message are subjected to bit-level scrambling, the initialization seed generation formula of the used scrambling codes is the same.
16. The network device of claim 10 or 11, wherein the resource mapping refers to a process of mapping a set of modulation symbols of a transport block corresponding to the first system message or the second system message to a set of available resources of the first system message or the second system message.
17. The network device of claim 16, wherein the set of available resources for the first system message refers to a set of subframes 3 for every other frame in the first time period, and wherein the set of available resources for the second system message refers to a set of subframes 4 for every other frame in the first time period.
18. The network device according to claim 10 or 11, wherein the resource mapping between the first system message and a second system message sent by the network device to the terminal device through the first channel in the first time period is performed in a different resource mapping manner, including:
performing resource mapping on a set of available resources of the first system message by adopting a first sequence for a set of modulation symbols of a transmission block corresponding to the first system message;
performing resource mapping on the available resource set of the second system message by adopting a second sequence for the modulation symbol set of the transmission block corresponding to the second system message;
wherein the first order and the second order are different.
19. A network device comprising a processor, a memory, and a transmitter,
the memory is used for storing a software program;
the processor, which is used to call and execute the software program stored in the memory, and send data through the transmitter to realize the method as claimed in any one of claims 1 to 9.
20. A computer-readable medium having stored thereon computer instructions which, when run on a computer, cause the computer to perform the method of any one of claims 1 to 9.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2017/111353 WO2019095203A1 (en) | 2017-11-16 | 2017-11-16 | Method for system message transmission and network device |
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| Publication Number | Publication Date |
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| CN111052820A CN111052820A (en) | 2020-04-21 |
| CN111052820B true CN111052820B (en) | 2021-09-07 |
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| WO2017153118A1 (en) * | 2016-03-11 | 2017-09-14 | Sony Corporation | Repetitive transmission for nb-iot |
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| WO2019095203A1 (en) | 2019-05-23 |
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