CN109151893B - Resource mapping method and device of physical broadcast channel, base station and storage medium - Google Patents
Resource mapping method and device of physical broadcast channel, base station and storage medium Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0252—Traffic management, e.g. flow control or congestion control per individual bearer or channel
- H04W28/0263—Traffic management, e.g. flow control or congestion control per individual bearer or channel involving mapping traffic to individual bearers or channels, e.g. traffic flow template [TFT]
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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
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W72/30—Resource management for broadcast services
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Abstract
The invention provides a resource mapping method and a device of a physical broadcast channel, a base station and a storage medium, wherein the total time-frequency resources occupied by the physical broadcast channel comprise a first area on a frequency domain, and the first area is overlapped with the frequency domain range of the distribution of a synchronous signal, and the method comprises the following steps: determining a distribution of demodulation reference signals in the first region, the demodulation reference signals being used for demodulation of broadcast information of the physical broadcast channel; mapping the broadcast information of the physical broadcast channel to the first area according to the distribution of the demodulation reference signals in the first area; wherein the physical broadcast channel is adapted to transmit the demodulation reference signal and the broadcast information. The technical scheme of the invention has high resource utilization efficiency.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a resource mapping method and apparatus for a physical broadcast channel, a base station, and a storage medium.
Background
The 3rd Generation Partnership Project (3 GPP) is currently introducing New Radio access technology (NR), including at least fifth Generation mobile communication technology (5G).
In the design of 3GPP NR, the bandwidth of a New radio-Synchronization signal (NR-SS), i.e., the frequency domain range of the distribution of the Synchronization signal, is not consistent with the bandwidth occupied by a New radio-physical broadcast channel (NR-PBCH), and the Synchronization signal and the physical broadcast channel are co-located in a Synchronization Signal Block (SSB). For convenience of description, in the present application, a new air interface synchronization signal is referred to as a synchronization signal for short, and a new air interface physical broadcast channel is referred to as a physical broadcast channel for short. The resource utilization rate of the existing resource mapping method of the physical broadcast channel needs to be improved.
Disclosure of Invention
The technical problem solved by the invention is to improve the resource utilization rate of the resource mapping method.
In order to solve the foregoing technical problem, an embodiment of the present invention provides a resource mapping method for a physical broadcast channel, where a total time-frequency resource occupied by the physical broadcast channel includes a first region in a frequency domain, and the first region coincides with a frequency domain range where a synchronization signal is distributed, where the method includes: determining a distribution of demodulation reference signals in the first region, the demodulation reference signals being used for demodulation of broadcast information of the physical broadcast channel; mapping the broadcast information of the physical broadcast channel to the first area according to the distribution of the demodulation reference signals in the first area; wherein the physical broadcast channel is adapted to transmit the demodulation reference signal and the broadcast information.
Optionally, the total time-frequency resources occupied by the physical broadcast channel are divided into the first region and the second region according to frequency; the resource mapping method of the physical broadcast channel further comprises the following steps: and mapping all or part of the broadcast information of the physical broadcast channel to the second area according to the distribution of the demodulation reference signals in the second area.
Optionally, time-frequency resources occupied by the demodulation reference signal in the first region are less than time-frequency resources occupied by the demodulation reference signal in the second region.
Optionally, the mapping the broadcast information of the physical broadcast channel to the first region includes: determining a first region code word bit length used for transmitting the physical broadcast channel in the first region according to the total number of the time frequency resources in the first region, the modulation format of the physical broadcast channel and the number of the time frequency resources occupied by the demodulation reference signal in the first region; determining a first information code word bit length of broadcast information of the physical broadcast channel, wherein the first information code word bit length is the length of a first information code word bit sequence obtained according to the broadcast information; performing first rate matching on the first information code word bit sequence according to the relationship between the first region code word bit length and the first information code word bit length to obtain a first matched code word bit sequence adaptive to the length of the first information code word bit sequence; scrambling and modulating the first matched code word bit sequence to obtain a first modulation symbol sequence; mapping the first modulation symbol sequence to the first region.
Optionally, performing the first rate matching on the first information code word bit sequence according to the relationship between the first region code word bit length and the length of the first information code word bit sequence includes any one of: when the first region code word bit length is smaller than the first information code word bit length, punching or shortening the first information code word bit sequence; repeating all or part of the first information codeword bit sequence when the first region codeword bit length is greater than the first information codeword bit length.
Optionally, the mapping all or part of the content in the broadcast information of the physical broadcast channel to the second area includes: determining a second region code word bit length used for transmitting the physical broadcast channel in the second region according to the total number of the time frequency resources in the second region, the modulation format of the physical broadcast channel and the number of the time frequency resources occupied by the demodulation reference signal in the second region; performing second rate matching on the first matching code word bit sequence according to the second regional code word bit length to obtain a second matching code word bit sequence adaptive to the second regional code word bit length; scrambling and modulating the second matched code word bit sequence to obtain a second modulation symbol sequence; mapping the second modulation symbol sequence to the second region.
Optionally, performing second rate matching on the first matching codeword bit sequence according to the second regional codeword bit length to obtain a second matching codeword bit sequence adaptive to the second regional codeword bit length includes: taking the sum of the first region code word bit length and the second region code word bit length as the total region code word bit length; and performing the second rate matching on the first matching code word bit sequence in a repeated mode according to the total regional code word bit length to obtain a total matching code word bit sequence adaptive to the total regional code word bit length, and obtaining the second matching code word bit sequence according to the total matching code word bit sequence and the first matching code word bit sequence.
Optionally, cyclic redundancy check coding and channel coding are performed on the broadcast information to obtain the first information codeword bit sequence.
Optionally, the frequency domain range of the distribution of the synchronization signal is in units of frequency domain widths of resource blocks.
Optionally, the determining the distribution of the demodulation reference signals in the first region includes: the demodulation reference signal is only arranged in resource blocks adjacent to the second region in the first region.
An embodiment of the present invention further provides a device for resource mapping of a physical broadcast channel, where a total time-frequency resource occupied by the physical broadcast channel includes a first region in a frequency domain, and the first region coincides with a frequency domain range in which a synchronization signal is distributed, and the device includes: a determining unit adapted to determine a distribution of demodulation reference signals in the first region, the demodulation reference signals being used for demodulation of broadcast information of the physical broadcast channel; a first mapping unit, adapted to map the broadcast information of the physical broadcast channel to the first region according to the distribution of the demodulation reference signals in the first region; wherein the physical broadcast channel is adapted to transmit the demodulation reference signal and the broadcast information.
Optionally, the total time-frequency resources occupied by the physical broadcast channel are divided into the first region and the second region according to frequency; the resource mapping apparatus further includes: and the second mapping unit is suitable for mapping all or part of contents in the broadcast information of the physical broadcast channel to the second area according to the distribution of the demodulation reference signals in the second area.
Optionally, time-frequency resources occupied by the demodulation reference signal in the first region are less than time-frequency resources occupied by the demodulation reference signal in the second region.
Optionally, the first mapping unit includes: a first region codeword bit length determining subunit, configured to determine a first region codeword bit length for transmitting the physical broadcast channel in the first region according to the total number of time-frequency resources in the first region, the modulation format of the physical broadcast channel, and the number of time-frequency resources occupied by the demodulation reference signal in the first region; a first information code word bit length determining subunit, adapted to determine a first information code word bit length of broadcast information of the physical broadcast channel, where the first information code word bit length is a length of a first information code word bit sequence obtained according to the broadcast information; the first matching subunit is suitable for performing first rate matching on the first information code word bit sequence according to the relationship between the first region code word bit length and the first information code word bit length to obtain a first matching code word bit sequence adaptive to the length of the first information code word bit sequence; the first scrambling modulation subunit is suitable for scrambling and modulating the first matched code word bit sequence to obtain a first modulation symbol sequence; a first mapping subunit adapted to map the first modulation symbol sequence to the first region.
Optionally, the first matching subunit is adapted to perform the first rate matching by using any one of the following manners: when the first region code word bit length is smaller than the first information code word bit length, punching or shortening the first information code word bit sequence; repeating all or part of the first information codeword bit sequence when the first region codeword bit length is greater than the first information codeword bit length.
Optionally, the second mapping unit includes: a second region codeword bit length determining subunit, configured to determine a second region codeword bit length for transmitting the physical broadcast channel in the second region according to the total number of time-frequency resources in the second region, the modulation format of the physical broadcast channel, and the number of time-frequency resources occupied by the demodulation reference signal in the second region; the second matching subunit is adapted to perform second rate matching on the first matching codeword bit sequence according to the second regional codeword bit length to obtain a second matching codeword bit sequence adapted to the second regional codeword bit length; the second scrambling modulation subunit is suitable for scrambling and modulating the second matched code word bit sequence to obtain a second modulation symbol sequence; a second mapping subunit adapted to map the second modulation symbol sequence to the second region.
Optionally, the second matching subunit includes: a domain codeword bit length determining unit adapted to take the sum of the first region codeword bit length and the second region codeword bit length as a total region codeword bit length; and the second matching code word bit sequence generating unit is suitable for performing the second rate matching on the first matching code word bit sequence in a repeated mode according to the total regional code word bit length to obtain a total matching code word bit sequence adaptive to the total regional code word bit length, and obtaining the second matching code word bit sequence according to the total matching code word bit sequence and the first matching code word bit sequence.
Optionally, the first information codeword bit length determining subunit is adapted to perform cyclic redundancy check coding and channel coding on the broadcast information to obtain the first information codeword bit sequence.
Optionally, the frequency domain range of the distribution of the synchronization signal is in units of frequency domain widths of resource blocks.
Optionally, the determining unit is adapted to determine that the demodulation reference signal is only disposed in resource blocks adjacent to the second region in the first region.
The embodiment of the present invention further provides a base station, which includes a memory and a processor, where the memory stores a computer instruction capable of running on the processor, and the processor executes the resource mapping method of the broadcast channel when running the computer instruction.
The embodiment of the present invention further provides a storage medium, on which computer instructions are stored, and when the computer instructions are executed, the steps of the resource mapping method for a broadcast channel are executed.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
in the embodiment of the present invention, a time frequency resource coinciding with a frequency domain range in which a synchronization signal is distributed in total time frequency resources occupied by a physical broadcast channel is used as a first region, and if a synchronization signal is used to assist or replace part of demodulation reference signals, the time frequency resources occupied by the demodulation reference signals in the first region may be less. The distribution of the demodulation reference signals in the first area is determined, and the broadcast signals of the physical broadcast channel are mapped to the first area according to the distribution of the demodulation reference signals in the first area, so that the time-frequency resources of the first area can be more fully utilized.
Drawings
Fig. 1 is a flowchart of a resource mapping method of a physical broadcast channel according to an embodiment of the present invention;
fig. 2 to 9 are schematic diagrams illustrating various position relationships between time-frequency resources for transmitting synchronization signals and time-frequency resources for transmitting physical broadcast channels according to an embodiment of the present invention;
FIG. 10 is a schematic structural diagram of a time-frequency resource according to an embodiment of the present invention;
FIG. 11 is a flowchart of one specific implementation of step S12 in FIG. 1;
FIG. 12 is a flowchart of one specific implementation of step S13 of FIG. 1;
FIG. 13 is a flowchart of one specific implementation of step S132 of FIG. 12;
fig. 14 is a flowchart of a resource mapping method of another physical broadcast channel according to another embodiment of the present invention;
fig. 15 is a flowchart of a resource mapping method for a physical broadcast channel according to another embodiment of the present invention;
fig. 16 is a schematic structural diagram of a resource mapping apparatus for a physical broadcast channel according to an embodiment of the present invention;
FIG. 17 is a diagram illustrating a first mapping unit according to an embodiment of the invention;
FIG. 18 is a diagram illustrating a second mapping unit according to an embodiment of the invention;
Detailed Description
As mentioned above, in the 3GPP NR design, the bandwidth of the synchronization signal, i.e. the frequency domain range of the distribution of the synchronization signal, is not consistent with the bandwidth occupied by the physical broadcast channel. The physical broadcast channel is used to transmit broadcast information and a demodulation reference signal for demodulating the broadcast information.
When performing Resource mapping of the physical broadcast channel, one possible scheme is to map codeword bits of the physical broadcast channel onto Resource Elements (REs) in the total time-frequency resources occupied by the physical broadcast channel.
In this way, the total time-frequency resources occupied by the physical broadcast channel are mapped as a whole. The narrowband terminal usually receives within the bandwidth of the synchronization signal, and in such a scheme, the narrowband terminal only receives the signal within the bandwidth of the synchronization signal, and usually cannot obtain complete broadcast information. If effective demodulation of broadcast information is to be ensured, more time-frequency resources are generally occupied or a narrowband terminal receives the broadcast information in a radio frequency modulation or frequency hopping mode, so that the resource utilization rate is low.
Another possible scheme is to divide a first region and a second region of total time-frequency resources occupied by a physical broadcast channel, the first region is overlapped with a frequency domain range of distribution of a synchronization signal, and resource mapping of broadcast information is performed on the first region and the second region according to the same mode. This approach does not take into account the difference between the first region and the second region, and the resource utilization efficiency is also low.
In the embodiment of the present invention, a time-frequency resource that coincides with a frequency domain range in which a synchronization signal is distributed in total time-frequency resources occupied by a physical broadcast channel is used as a first region, and if a synchronization signal can be used to assist or replace part of demodulation reference signals, the time-frequency resources occupied by the demodulation reference signals in the first region may be less, and further, a situation that there are more time-frequency resources for transmitting broadcast information in the demodulation reference signals in the first region may occur. And mapping the broadcast signal of the physical broadcast channel to the first area according to the distribution of the demodulation reference signal in the first area, so that the time-frequency resource of the first area can be more fully utilized, and the resource utilization rate is further improved.
In addition, by mapping the broadcast information of the physical broadcast channel to the first region, the narrowband terminal can acquire complete broadcast information only by receiving signals within the bandwidth range of the synchronous signal, so that the terminal is prevented from performing radio frequency modulation or frequency hopping, and the energy consumption of the terminal is reduced.
It will be understood by those skilled in the art that the communication concept involved in the present invention, which is a concept in the NR system, may be the same as or similar to that in the LTE system, or may be a design different from that in the LTE system. For example, the demodulation reference signal in the present invention is used for the terminal to demodulate the broadcast information, and the specific sequence format, mapping pattern, and other designs may be different from the demodulation reference signal in the LTE system.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In an embodiment of the present invention, the total time-frequency resources occupied by the physical broadcast channel include a first region in the frequency domain, and the first region coincides with a frequency domain range of the distribution of the synchronization signal. Referring to fig. 1, a resource mapping method of a physical broadcast channel may include the steps of:
step S11, determining distribution of demodulation reference signals in the first region, where the demodulation reference signals are used for demodulation of broadcast information of the physical broadcast channel;
step S12, mapping the broadcast information of the physical broadcast channel to the first area according to the distribution of the demodulation reference signal in the first area.
Wherein the physical broadcast channel is adapted to transmit the demodulation reference signal and the broadcast information. The terminal can receive the broadcast information, the reference demodulation signal and the synchronization signal to communicate with the network side.
In a specific implementation, the total time-frequency resources occupied by the physical broadcast channel may be divided into the first region and the second region, as described above, the first region is a region overlapping with a frequency domain range in which the synchronization signal is distributed, and the second region is a portion of the total time-frequency resources occupied by the physical broadcast channel, which is outside the first region.
The resource mapping method in the embodiment of the present invention may further include:
step S13, mapping all or part of the content in the broadcast information of the physical broadcast channel to the second area according to the distribution of the demodulation reference signal in the second area.
The distribution of the demodulation reference signals in the first region and the distribution of the demodulation reference signals in the second region may be different, and time-frequency resources occupied by the demodulation reference signals in the first region may be less than time-frequency resources occupied by the demodulation reference signals in the second region.
One Synchronization Signal block may include resources having a time domain length of two symbols for transmitting a Synchronization Signal, and the Synchronization Signal may include a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS), and resources having a time domain length of 2 symbols allocated to a physical broadcast channel. As will be appreciated by those skilled in the art, the PSS and SSS in the present application are both signals in the NR system, and the specific design thereof may be the same as or similar to that in the LTE system, or may be a different design than that in the LTE system.
From the synchronization signal block perspective, the time domain length of the total time frequency resource occupied by the physical broadcast channel may be 2 symbols. As will be appreciated by those skilled in the art, in each synchronization signal block, the total time-frequency resources occupied by the physical broadcast channel can be divided into a first region and a second region.
The relative relationship between the time-frequency resources used for transmitting PSS, SSS and NR-PBCH in a synchronization signal block may be varied, for example, as shown in fig. 2 to 5, the time-frequency resources used for transmitting PSS, SSS and NR-PBCH may be aligned with the central frequency, and the time-frequency resources may be arranged in different time domains. In fig. 2 to 5, the region division positions of the NR-PBCH in the frequency domain are each illustrated with a dotted line.
The relative relationship between the time-frequency resources for transmitting PSS and SSS and the time-frequency resources for transmitting NR-PBCH in the frequency domain may also be aligned based on the upper edge or the lower edge of the bandwidth, and the time-frequency resources for transmitting PSS and SSS and the time-frequency resources for transmitting NR-PBCH are aligned according to the lower edge of the frequency band, as shown in fig. 6 to 9, it can be seen that the distribution positions of the time-frequency resources for transmitting PSS and SSS and the time-frequency resources for transmitting NR-PBCH in the frequency domain in the time domain may also be various. In fig. 6 to 9, the location of the division of the time-frequency resources in the frequency domain for the transmission of the NR-PBCH is also illustrated in dashed lines.
The frequency domain range of the synchronization signal distribution may be in units of frequency domain widths of the resource blocks, that is, the frequency domain range of the synchronization signal distribution is an integer multiple of the frequency domain width of the resource blocks, and further, the first region and the second region may be divided in units of the resource blocks.
For example, in the diagrams of fig. 2 to 9, the bandwidth of the time-frequency resources for transmitting PSS and SSS in the frequency domain may be 12 Resource Blocks (RBs), and the bandwidth of the NR-PBCH may be 24 Resource blocks.
Similar to the LTE system, each Resource block in the NR system may be carried by 12 subcarriers in the frequency domain, including 12 Resource Elements (REs). The setting of the demodulation reference signal may be in RE units.
In the LTE system, the synchronization signal is transmitted within 6 RBs, but only within 62 subcarriers, leaving 5 subcarriers as guard bands on both side edges. Similar to the LTE system, in the NR system, in the time-frequency resource for transmitting the synchronization signal, a part of REs may be left within two RBs located at an edge position.
The distribution of the demodulation reference signals in the first region may be non-uniform, the demodulation reference signals may be set in a part of REs of RBs at a position adjacent to the second region in the first region, and the demodulation reference signals may not be set in any other RBs of the first region.
In this way, the synchronization signal can support demodulation of the terminal in the bandwidth corresponding to the subcarrier used for transmitting the synchronization signal in the first region, and the demodulation reference signal is set in the frequency domain position corresponding to the guard band, that is, the RB in the position adjacent to the first region and the second region, so that smooth demodulation of the terminal can be ensured. In addition, in other RBs in the second region, the demodulation reference signal may not be set, so that more time-frequency resources may be used for transmitting broadcast information in the first region.
Taking the position relationship of the time-frequency resources for transmitting the PSS, the SSS and the NR-PBCH shown in fig. 5 as an example, referring to fig. 10, the dashed line shows the position of the boundary of the first region and the second region on the frequency domain. The first region may include 12 RBs, and the second region may also include 12 RBs.
Assuming that each RB can be carried by 12 subcarriers, similar to that in the LTE system, time-frequency resources for transmitting synchronization signals are carried by 144 subcarriers. The synchronization signal can be carried only on 127 subcarriers in the center, guard bands are reserved on the two side frequency bands, and the subcarriers in the guard bands do not transmit the synchronization signal.
Thus, in the 4 RBs located at the edge shown in the diagram 101, the sub-carriers located in the guard band do not carry the synchronization signal, and in order to ensure demodulation of the terminal, the demodulation reference signal may be set at a corresponding position of the time-frequency resource occupied by the physical broadcast channel, that is, the demodulation reference signal is set in the RB of the first region adjacent to the second region, for example, the demodulation reference signal is set in the RB shown in the diagram 102.
When the demodulation reference signals are set in RBs in which the first region and the second region are adjacent, the demodulation reference signals may be set at the same frequency domain interval as the second region, taking the RB shown in the legend 103 as an example, the interval of the demodulation reference signals in the second region is 3 REs, and the RE shown in the legend 104 is an RE for setting the demodulation reference signals.
In the RB located at the edge as shown in the legend 101, REs located at the same subcarriers as those shown in the legend 105 are used for transmission of the synchronization signal. The synchronization signal can implement a function similar to that of the demodulation reference signal, and if the same subcarrier in the same synchronization signal block carries the synchronization signal, the terminal can reserve the parameter of the synchronization signal for demodulation reference. From this point of view, the REs shown in the legend 105 may be similar to REs carrying demodulation reference signals.
When the demodulation reference signal is set in the RB adjacent to the second region in the first region, the RE shown in fig. 105 may be calculated as the RE in which the demodulation reference signal is set, taking into account the RE shown in fig. 105, and the demodulation reference signal may be set in combination with the RE shown in fig. 105, so that the interval of the demodulation reference signal within the RB located in the second region coincides with the interval of the demodulation reference signal within the RB in the first region. For example, as shown in fig. 10, the demodulation reference signal may be inserted only in the REs located outside the guard band frequency domain position, and the remaining positions are implemented by the synchronization signal with a similar function to the demodulation reference signal.
Setting the demodulation reference signals in the above manner, the terminal may store the parameters of the synchronization signal with the same frequency domain position as the RE107 and the parameters of the synchronization signal with the same frequency domain position as the RE106, and may obtain the similar demodulation effect as the second area in combination with the demodulation reference signals transmitted by the RE shown in the legend 104.
Although the second region is illustrated with the RB shown in the legend 103 as an example, the distribution of the demodulation reference signals therein is shown, it will be understood by those skilled in the art that other RBs in the second region may also set the demodulation reference signals in the same or similar manner.
In the embodiment of the present invention, the broadcast information of the physical broadcast channel is mapped to the first region according to the distribution of the demodulation reference signals in the first region, specifically, the distribution of the REs of the demodulation reference signals in the first region is determined, so as to map the broadcast information of the physical broadcast channel to the REs without the distribution of the demodulation reference signals.
Referring to fig. 11, step S12 in fig. 1 may further include steps S121 to S124, which are described below.
Step S121, determining a first region codeword bit length for transmitting the physical broadcast channel in the first region according to the total number of time frequency resources in the first region, the modulation format of the physical broadcast channel, and the number of time frequency resources occupied by the demodulation reference signal in the first region.
The total number of time frequency resources in the first region refers to a region where, in the time frequency resources used for transmitting the physical broadcast channel in one symbol, a bandwidth coincides with a frequency domain range in which the synchronization signal is distributed, and the total number of time frequency resources may be the number of RBs.
The number of the time-frequency resources occupied by the demodulation reference signal in the first region may be the number of REs, and the length of the codeword bit sequence that can be used for transmitting the broadcast information in the first region may be obtained according to the total number of the time-frequency resources, the number of the time-frequency resources occupied by the demodulation reference signal, and the modulation format of the broadcast channel.
Step S122, determining a first information code word bit length of the broadcast information of the physical broadcast channel, where the first information code word bit length is a length of a first information code word bit sequence obtained according to the broadcast information.
The first information codeword bit sequence may be obtained by performing Cyclic Redundancy Code (CRC) coding and channel coding on the broadcast information. The first information codeword bit length may specifically be a mother code codeword length.
Step S123, performing a first rate matching on the first information codeword bit sequence according to the relationship between the first region codeword bit length and the first information codeword bit length, to obtain a first matched codeword bit sequence adapted to the length of the first information codeword bit sequence.
The first region code word bit length indicates the number of code word bits that the first region can accommodate, and the first information code word bit length indicates the code word length of a first information code word bit sequence generated by the broadcast information. In order to make the two coincide, first rate matching is required.
Specifically, the first rate matching may be performed in any one of the following manners:
when the first region code word bit length is smaller than the first information code word bit length, punching or shortening the first information code word bit sequence to realize the matching of the first region code word bit sequence and the first information code word bit length;
when the first region code word bit length is larger than the first information code word bit length, repeating all or part of the first information code word bit sequence to realize the matching of the first region code word bit sequence and the first information code word bit length.
After the rate matching is performed by any one of the above methods, a first matched codeword bit sequence is obtained, where the codeword bit length is matched with the codeword bit length of the first region that can be accommodated by the first region.
Step S124, scrambling and modulating the first matching code word bit sequence to obtain a first modulation symbol sequence.
Step S125, mapping the first modulation symbol sequence to the first region.
When mapping the first modulation symbol sequence to the first region, a mapping rule may be selected as needed to map the first modulation symbol sequence to all or part of REs in the first region that are not used for transmitting the demodulation reference signal.
Referring to fig. 12, step S13 in fig. 1 may further include steps S131 to S134, which are described below.
Step S131, determining a second region code word bit length for transmitting the physical broadcast channel in the second region according to the total number of the time frequency resources in the second region, the modulation format of the physical broadcast channel and the number of the time frequency resources occupied by the demodulation reference signal in the second region;
step S132, performing second rate matching on the first matching code word bit sequence according to the second regional code word bit length to obtain a second matching code word bit sequence adapted to the second regional code word bit length;
step S133, scrambling and modulating the second matching codeword bit sequence to obtain a second modulation symbol sequence;
step S134, mapping the second modulation symbol sequence to the second region.
The second rate matching in step S132 may be performed in a manner of repeating all or part of the first matching codeword bit sequence.
By performing the second rate matching by using the first matching codeword bit sequence, it is not necessary to repeat the codeword bit sequence generated by broadcasting information and the process of performing CRC coding and channel coding on the codeword bit sequence, which is beneficial to improving efficiency.
Referring to fig. 13, step S132 in fig. 12 may further include step S1321 and step S1322:
step S1321, using the sum of the first region code word bit length and the second region code word bit length as the total region code word bit length;
step S1322 is to perform the second rate matching on the first matching codeword bit sequence in a repeated manner according to the total regional codeword bit length to obtain a total matching codeword bit sequence adapted to the total regional codeword bit length, and obtain the second matching codeword bit sequence according to the total matching codeword bit sequence and the first matching codeword bit sequence.
The total regional code word bit length indicates the total code word bit capacity which can be used for transmitting broadcast information, the second rate matching is performed on the first matching code word bit sequence in a repeated mode, and the total matching code word bit sequence with the code word bit number matched with the total regional code word bit length can be obtained on the premise of reserving the first matching code word bit sequence. The second matching codeword bit sequence is obtained by subtracting the first matching codeword bit sequence from the total matching codeword bit sequence.
Therefore, mapping all or part of the content of the broadcast information of the physical broadcast channel to the second region may be performed according to the first matching codeword bit sequence obtained when mapping the broadcast information of the physical broadcast channel to the first region in steps S131 to S134 as described in the above embodiments.
Since the wideband terminal can receive both the first region and the second region, the sequence of the second region can play an auxiliary role on the premise that the first modulation symbol sequence of the first region contains a complete codeword.
Therefore, after the first matching codeword bit sequence is obtained in step S123 of fig. 11, the total matching codeword bit sequence can be obtained based on the first matching codeword bit sequence. The total matched codeword bit sequence includes both the first matched codeword bit sequence and the second matched codeword bit sequence.
In a specific implementation of the present invention, step S124 in fig. 11 and step S133 in fig. 12 may be implemented by scrambling and modulating a total matched codeword bit sequence, where a total modulation symbol sequence obtained by scrambling and modulating the total matched codeword bit sequence includes the first modulation symbol sequence and the second modulation symbol sequence.
Rule for mapping a first modulation symbol sequence to a first region and mapping a second modulation symbol sequence to a second region
In other embodiments of the present invention, those skilled in the art can also utilize other ways to implement the second rate matching in the present invention that are not based on the first matching codeword bit sequence. Further, according to all or part of the broadcast information, a second region code word bit sequence matched with the second region code word bit length is obtained, and according to the second region code word bit sequence, a second modulation symbol sequence is obtained and mapped to the second region.
Two more detailed examples are given below to further illustrate the invention.
The first embodiment is as follows:
it is assumed that the bit length of the broadcast information subjected to CRC coding is 72, and the bit length of the first information codeword bit sequence obtained after channel coding is 512. The bandwidth of the first region is 12 RBs, carried by 144 subcarriers, and the bandwidth of region 2 is 12 RBs, carried by 144 subcarriers.
The demodulation reference signal density of the second region distributes 3 demodulation reference signals for each RB. In the first region, reference signals are provided only in two resource blocks adjacent to the second region so that the parts other than the guard band in the resource blocks are combined with the distribution of the synchronization signals, and when the demodulation reference signals are replaced with the synchronization signals, the density of the demodulation reference signals is the same as that in the second region. The resource division and the distribution of the demodulation reference signals within a synchronization signal block can be referred to fig. 10.
Referring to fig. 14, in the present embodiment, the resource mapping of the physical broadcast channel may be accomplished by the following steps:
step S141, determining the distribution of the demodulation reference signals in the first area and the second area;
step S142, determining the code word bit length L of the first area according to the distribution of the demodulation reference signal in the first area1＝560；
Step S143, determining the code word bit length L of the second area according to the distribution of the demodulation reference signal in the second area2＝432；
Step S144, determining the total region code word bit length L capable of being accommodated in the total time frequency resource for transmitting the broadcast channelt＝992；
Step S145, coding the broadcast information to obtain the first information code word bit sequence b0Of length L of the first information code word bit length0＝512；
Step S146, according to the code word bit length L of the first region1And a first information codeword bit length L0For the first information code word bit sequence b0Performing rate matching to obtain a first matchCode word bit sequence b1A length equal to the first region codeword bit length L1。
Step S147, for the first matching code word bit sequence b1Performing second rate matching to obtain a total matching code word bit sequence btOf length equal to the total regional code word bit length Lt；
Step S148, for the total matching code word bit sequence btScrambling and modulating to obtain a total modulation symbol sequence dtComprising a first modulation symbol sequence d1And a second modulation symbol sequence d2；
Wherein the total modulation symbol sequence dtLength 496, first modulation symbol sequence d1Length 280, second modulation symbol sequence d2A length of 216;
step S149, the first modulation symbol sequence d1Mapping to the first region, and modulating the second modulation symbol sequence d2Mapping to a second region.
In this embodiment, the broadband terminal receives a first modulation symbol sequence d of a first region1And a second modulation symbol sequence d in the second region2The effective code rate is 72/992 and is less than 1/12; the narrowband terminal only receives the modulation symbol sequence d1 of the first region, and the effective code rate is 72/560 and is less than 1/6. Therefore, the resource utilization rate in this embodiment is high.
And calculating the effective code rate of the corresponding narrowband terminal: assuming that the number of information bits containing CRC bits is binfo72, and the first matched code word bit sequence b after channel coding and rate matching1Has a codeword length of L1560, then the effective code rate is
Calculating the effective code rate of the corresponding broadband terminal: assuming that the number of information bits containing CRC bits is binfo72, after channel coding and rate matching, the total matched code word bit sequence btHas a code word length of Lt992, the effective code rate is
Example two:
it is assumed that the bit length of the broadcast information subjected to CRC coding is 72, and the bit length of the first information codeword bit sequence obtained after channel coding is 512. The bandwidth of the first region is 12 RBs, carried by 144 subcarriers, and the bandwidth of region 2 is 12 RBs, carried by 144 subcarriers.
In this embodiment, the video resource for transmitting the broadcast channel in one synchronization signal block has a time domain length of two symbols, in the time frequency resource of the time domain length of one of the symbols, the distribution density of the demodulation reference signals in the first region is the same as that in the second region, and in the time frequency resource of the time domain length of the other symbol, the distribution of the demodulation reference signals in the first region is the same as that in the first embodiment. The demodulation reference signal density of the second region distributes 3 demodulation reference signals for each RB.
Referring to fig. 15, in the present embodiment, the resource mapping of the physical broadcast channel may be accomplished by the following steps:
step S151, determining the distribution of the demodulation reference signals in the first area and the second area;
step S152, according to the distribution of the demodulation reference signal in the first area, determining the code word bit length L of the first area1＝508；
Step S153, according to the distribution of the demodulation reference signal in the second area, determining the code word bit length L of the second area2＝432；
Step S154, determining the total region code word bit length L capable of being accommodated in the total time frequency resource for transmitting the broadcast channelt＝940；
Step S155, encoding the broadcast information to obtain a first information code word bit sequence b0Of length L of the first information code word bit length0＝512；
Step S156, according to the code word bit length L of the first region1And a first information codeword bit length L0To the firstBit sequence b of information code word0Carrying out rate matching to obtain a first matched code word bit sequence b1A length equal to the first region codeword bit length L1。
Step S157, for the first matching code word bit sequence b1Performing second rate matching to obtain a total matching code word bit sequence btOf length equal to the total regional code word bit length Lt；
Step S158, for the total matching code word bit sequence btScrambling and modulating to obtain a total modulation symbol sequence dtComprising a first modulation symbol sequence d1And a second modulation symbol sequence d2；
Wherein the total modulation symbol sequence dtLength 470, first modulation symbol sequence d1Length 254, second modulation symbol sequence d2A length of 216;
step S159, the first modulation symbol sequence d1Mapping to the first region, and modulating the second modulation symbol sequence d2Mapping to a second region.
In this embodiment, the broadband terminal receives a first modulation symbol sequence d of a first region1And a second modulation symbol sequence d in the second region2The effective code rate is 72/940 and is less than 1/12; the narrowband terminal only receives the modulation symbol sequence d1 of the first region, and the effective code rate is 72/508 and is less than 1/6.
In the second embodiment, the effective code rate is slightly larger than that in the first embodiment, but the value is still smaller, for example, smaller than that in the LTE system. Therefore, the resource utilization rate in this embodiment is also high.
In the embodiment of the present invention, a time frequency resource coinciding with a frequency domain range in which a synchronization signal is distributed in total time frequency resources occupied by a physical broadcast channel is used as a first region, and if a synchronization signal is used to assist or replace part of demodulation reference signals, the time frequency resources occupied by the demodulation reference signals in the first region may be less. The distribution of the demodulation reference signals in the first area is determined, and the broadcast signals of the physical broadcast channel are mapped to the first area according to the distribution of the demodulation reference signals in the first area, so that the time-frequency resources of the first area can be more fully utilized.
The embodiment of the present invention further provides a resource mapping apparatus for a physical broadcast channel, and a schematic structural diagram of the apparatus is shown in fig. 16. The total time-frequency resources occupied by the physical broadcast channel include a first region in the frequency domain, and the first region coincides with the frequency domain range of the distribution of the synchronization signals, and the resource mapping apparatus may include the following units:
a determining unit 161 adapted to determine a distribution of demodulation reference signals in the first region, the demodulation reference signals being used for demodulation of broadcast information of the physical broadcast channel;
a first mapping unit 162, adapted to map the broadcast information of the physical broadcast channel to the first region according to the distribution of the demodulation reference signals in the first region;
wherein the physical broadcast channel is adapted to transmit the demodulation reference signal and the broadcast information.
In a specific implementation, the total time-frequency resources occupied by the physical broadcast channel are divided into the first area and the second area according to frequency; the resource mapping apparatus further includes:
a second mapping unit 163, adapted to map all or part of the content in the broadcast information of the physical broadcast channel to the second area according to the distribution of the demodulation reference signal in the second area.
In a specific implementation, the time-frequency resources occupied by the demodulation reference signal in the first region are less than the time-frequency resources occupied by the demodulation reference signal in the second region.
In a specific implementation, referring to fig. 17, the first mapping unit 162 of fig. 16 may include:
a first region codeword bit length determining subunit 171, adapted to determine a first region codeword bit length for transmitting the physical broadcast channel in the first region according to the total number of time-frequency resources in the first region, the modulation format of the physical broadcast channel, and the number of time-frequency resources occupied by the demodulation reference signal in the first region;
a first information code word bit length determining subunit 172, adapted to determine a first information code word bit length of broadcast information of the physical broadcast channel, where the first information code word bit length is a length of a first information code word bit sequence obtained according to the broadcast information;
a first matching subunit 173 adapted to perform a first rate matching on the first information codeword bit sequence according to a relationship between the first region codeword bit length and the first information codeword bit length, so as to obtain a first matching codeword bit sequence adapted to the length of the first information codeword bit sequence;
a first scrambling modulation subunit 174, adapted to scramble and modulate the first matching codeword bit sequence to obtain a first modulation symbol sequence;
a first mapping subunit 175 adapted to map the first modulation symbol sequence to the first region.
In a specific implementation, the first matching subunit 173 is adapted to perform the first rate matching in any one of the following manners:
when the first region code word bit length is smaller than the first information code word bit length, punching or shortening the first information code word bit sequence;
repeating all or part of the first information codeword bit sequence when the first region codeword bit length is greater than the first information codeword bit length.
In a specific implementation, referring to fig. 18, the second mapping unit 163 in fig. 16 may include:
a second region codeword bit length determining subunit 181, configured to determine a second region codeword bit length for transmitting the physical broadcast channel in the second region according to the total number of time-frequency resources in the second region, the modulation format of the physical broadcast channel, and the number of time-frequency resources occupied by the demodulation reference signal in the second region;
a second matching subunit 182, adapted to perform second rate matching on the first matching codeword bit sequence according to the second regional codeword bit length, so as to obtain a second matching codeword bit sequence adapted to the second regional codeword bit length;
a second scrambling and modulating subunit 183, adapted to scramble and modulate the second matching codeword bit sequence to obtain a second modulation symbol sequence;
a second mapping subunit 184, adapted to map the second modulation symbol sequence to the second region.
In a specific implementation, the second matching subunit 182 may include:
a domain codeword bit length determining unit adapted to take the sum of the first region codeword bit length and the second region codeword bit length as a total region codeword bit length;
and the second matching code word bit sequence generating unit is suitable for performing the second rate matching on the first matching code word bit sequence in a repeated mode according to the total regional code word bit length to obtain a total matching code word bit sequence adaptive to the total regional code word bit length, and obtaining the second matching code word bit sequence according to the total matching code word bit sequence and the first matching code word bit sequence.
With continued reference to fig. 17, in an implementation, the first information codeword bit length determining subunit 172 is adapted to perform cyclic redundancy check coding and channel coding on the broadcast information to obtain the first information codeword bit sequence.
In a specific implementation, the frequency domain range of the synchronization signal distribution is in units of frequency domain widths of resource blocks.
With continued reference to fig. 16, in an implementation, the determining unit 161 is adapted to determine that the demodulation reference signal is only disposed in resource blocks adjacent to the second region in the first region.
The specific implementation and beneficial effects of the resource mapping apparatus of the physical broadcast channel in the embodiment of the present invention may refer to the resource mapping method in the embodiment of the present invention, and are not described herein again.
The embodiment of the present invention further provides a base station, where the memory stores a computer instruction capable of running on the processor, and the processor executes the resource mapping method of the broadcast channel in the embodiment of the present invention when running the computer instruction.
The embodiment of the present invention further provides a storage medium, on which computer instructions are stored, and when the computer instructions are executed, the resource mapping method of the broadcast channel in the embodiment of the present invention is executed.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (20)
1. A resource mapping method of a physical broadcast channel is characterized in that total time-frequency resources occupied by the physical broadcast channel are divided into a first area and a second area according to frequency, the first area is overlapped with a frequency domain range of synchronous signal distribution, and the second area is a part of the total time-frequency resources occupied by the physical broadcast channel except the first area; the method comprises the following steps:
determining a distribution of demodulation reference signals in the first region, the demodulation reference signals being used for demodulation of broadcast information of the physical broadcast channel;
mapping the broadcast information of the physical broadcast channel to the first area according to the distribution of the demodulation reference signals in the first area;
mapping all or part of contents in the broadcast information of the physical broadcast channel to the second area according to the distribution of the demodulation reference signals in the second area;
wherein the physical broadcast channel is adapted to transmit the demodulation reference signal and the broadcast information.
2. The method of claim 1, wherein the time-frequency resources occupied by the demodulation reference signals in the first region are less than the time-frequency resources occupied by the demodulation reference signals in the second region.
3. The method of claim 1, wherein the mapping the broadcast information of the physical broadcast channel to the first region comprises:
determining a first region code word bit length used for transmitting the physical broadcast channel in the first region according to the total number of the time frequency resources in the first region, the modulation format of the physical broadcast channel and the number of the time frequency resources occupied by the demodulation reference signal in the first region;
determining a first information code word bit length of broadcast information of the physical broadcast channel, wherein the first information code word bit length is the length of a first information code word bit sequence obtained according to the broadcast information;
performing first rate matching on the first information code word bit sequence according to the relationship between the first region code word bit length and the first information code word bit length to obtain a first matched code word bit sequence adaptive to the length of the first information code word bit sequence;
scrambling and modulating the first matched code word bit sequence to obtain a first modulation symbol sequence;
mapping the first modulation symbol sequence to the first region.
4. The method of claim 3, wherein performing the first rate matching on the first information codeword bit sequence according to the relationship between the first region codeword bit length and the length of the first information codeword bit sequence comprises any one of:
when the first region code word bit length is smaller than the first information code word bit length, punching or shortening the first information code word bit sequence;
repeating all or part of the first information codeword bit sequence when the first region codeword bit length is greater than the first information codeword bit length.
5. The method of claim 3, wherein the mapping all or part of the content of the broadcast information of the physical broadcast channel to the second region comprises:
determining a second region code word bit length used for transmitting the physical broadcast channel in the second region according to the total number of the time frequency resources in the second region, the modulation format of the physical broadcast channel and the number of the time frequency resources occupied by the demodulation reference signal in the second region;
performing second rate matching on the first matching code word bit sequence according to the second regional code word bit length to obtain a second matching code word bit sequence adaptive to the second regional code word bit length;
scrambling and modulating the second matched code word bit sequence to obtain a second modulation symbol sequence;
mapping the second modulation symbol sequence to the second region.
6. The method of claim 5, wherein performing a second rate matching on the first matching codeword bit sequence according to the second regional codeword bit length to obtain a second matching codeword bit sequence corresponding to the second regional codeword bit length comprises:
taking the sum of the first region code word bit length and the second region code word bit length as the total region code word bit length;
and performing the second rate matching on the first matching code word bit sequence in a repeated mode according to the total regional code word bit length to obtain a total matching code word bit sequence adaptive to the total regional code word bit length, and obtaining the second matching code word bit sequence according to the total matching code word bit sequence and the first matching code word bit sequence.
7. The method as claimed in claim 3, wherein the first information codeword bit sequence is obtained by performing cyclic redundancy check coding and channel coding on the broadcast information.
8. The method of claim 1, wherein the frequency domain range of the synchronization signal distribution is in units of frequency domain widths of resource blocks.
9. The method of claim 8, wherein the distribution of the demodulation reference signals in the first region comprises: the demodulation reference signal is only arranged in resource blocks adjacent to the second region in the first region.
10. A resource mapping device of a physical broadcast channel is characterized in that total time-frequency resources occupied by the physical broadcast channel are divided into a first area and a second area according to frequency, the first area is overlapped with a frequency domain range of synchronous signal distribution, and the second area is a part of the total time-frequency resources occupied by the physical broadcast channel except the first area; the device comprises:
a determining unit adapted to determine a distribution of demodulation reference signals in the first region, the demodulation reference signals being used for demodulation of broadcast information of the physical broadcast channel;
a first mapping unit, adapted to map the broadcast information of the physical broadcast channel to the first region according to the distribution of the demodulation reference signals in the first region;
a second mapping unit, adapted to map all or part of the content in the broadcast information of the physical broadcast channel to the second area according to the distribution of the demodulation reference signal in the second area;
wherein the physical broadcast channel is adapted to transmit the demodulation reference signal and the broadcast information.
11. The apparatus of claim 10, wherein the time-frequency resources occupied by the demodulation reference signals in the first region are less than the time-frequency resources occupied by the demodulation reference signals in the second region.
12. The apparatus of claim 10, wherein the first mapping unit comprises:
a first region codeword bit length determining subunit, configured to determine a first region codeword bit length for transmitting the physical broadcast channel in the first region according to the total number of time-frequency resources in the first region, the modulation format of the physical broadcast channel, and the number of time-frequency resources occupied by the demodulation reference signal in the first region;
a first information code word bit length determining subunit, adapted to determine a first information code word bit length of broadcast information of the physical broadcast channel, where the first information code word bit length is a length of a first information code word bit sequence obtained according to the broadcast information;
the first matching subunit is suitable for performing first rate matching on the first information code word bit sequence according to the relationship between the first region code word bit length and the first information code word bit length to obtain a first matching code word bit sequence adaptive to the length of the first information code word bit sequence;
the first scrambling modulation subunit is suitable for scrambling and modulating the first matched code word bit sequence to obtain a first modulation symbol sequence;
a first mapping subunit adapted to map the first modulation symbol sequence to the first region.
13. The apparatus of claim 12, wherein the first matching subunit is adapted to perform the first rate matching by using any one of the following manners:
when the first region code word bit length is smaller than the first information code word bit length, punching or shortening the first information code word bit sequence;
repeating all or part of the first information codeword bit sequence when the first region codeword bit length is greater than the first information codeword bit length.
14. The apparatus of claim 12, wherein the second mapping unit comprises:
a second region codeword bit length determining subunit, configured to determine a second region codeword bit length for transmitting the physical broadcast channel in the second region according to the total number of time-frequency resources in the second region, the modulation format of the physical broadcast channel, and the number of time-frequency resources occupied by the demodulation reference signal in the second region;
the second matching subunit is adapted to perform second rate matching on the first matching codeword bit sequence according to the second regional codeword bit length to obtain a second matching codeword bit sequence adapted to the second regional codeword bit length;
the second scrambling modulation subunit is suitable for scrambling and modulating the second matched code word bit sequence to obtain a second modulation symbol sequence;
a second mapping subunit adapted to map the second modulation symbol sequence to the second region.
15. The apparatus of claim 14, wherein the second matching subunit comprises:
a domain codeword bit length determining unit adapted to take the sum of the first region codeword bit length and the second region codeword bit length as a total region codeword bit length;
and the second matching code word bit sequence generating unit is suitable for performing the second rate matching on the first matching code word bit sequence in a repeated mode according to the total regional code word bit length to obtain a total matching code word bit sequence adaptive to the total regional code word bit length, and obtaining the second matching code word bit sequence according to the total matching code word bit sequence and the first matching code word bit sequence.
16. The apparatus of claim 12, wherein the first information codeword bit length determining subunit is adapted to perform cyclic redundancy check coding and channel coding on the broadcast information to obtain the first information codeword bit sequence.
17. The apparatus of claim 10, wherein the frequency domain range of the synchronization signal distribution is in units of frequency domain widths of resource blocks.
18. The apparatus of claim 17, wherein the determining unit is adapted to determine that the demodulation reference signal is only disposed in resource blocks adjacent to the second region in the first region.
19. A base station comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor when executing the computer instructions performs the method of resource mapping for broadcast channels of any of claims 1 to 9.
20. A storage medium having stored thereon computer instructions, wherein the computer instructions when executed perform the steps of the resource mapping method for a broadcast channel of any one of claims 1 to 9.
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