CN110572865B - SSB receiving method and device, storage medium and terminal - Google Patents
SSB receiving method and device, storage medium and terminal Download PDFInfo
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- CN110572865B CN110572865B CN201910848358.2A CN201910848358A CN110572865B CN 110572865 B CN110572865 B CN 110572865B CN 201910848358 A CN201910848358 A CN 201910848358A CN 110572865 B CN110572865 B CN 110572865B
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Abstract
A receiving method and device, storage medium and terminal of SSB are provided, the receiving method includes: receiving first downlink data at a first preset time period to attempt to extract a plurality of SSBs from the first downlink data; if the plurality of SSBs are not received, receiving second downlink data in a second preset time period to attempt to extract the plurality of SSBs from the second downlink data; the second preset time period is after the first preset time period, and an interval is formed between the second preset time period and the first preset time period. The technical scheme provided by the invention can flexibly receive the SSB so as to search the network as fast as possible.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for receiving an SSB, a storage medium, and a terminal.
Background
In New Radio (NR), The period of a Synchronization Signal Block (SSB) is configurable, and may be {5,10,20,40,80,160} milliseconds (ms).
The 3rd Generation Partnership Project (3 GPP) protocol 38.213 specifies: the terminal may assume an SSB period of 20ms and perform a network search in 20 ms. Therefore, the terminal generally receives 20ms data directly for offline processing, but when the SSB period is {40,80,160} ms, receiving 20ms data does not guarantee to receive the SSB. And directly selecting the maximum period value of 160ms as the data receiving length wastes a great deal of memory space, and reduces the network searching speed of the short-period SSB.
Disclosure of Invention
The technical problem solved by the invention is how to flexibly receive the SSB.
To solve the foregoing technical problem, an embodiment of the present invention provides a method for receiving an SSB, including: receiving first downlink data at a first preset time period to attempt to extract a plurality of SSBs from the first downlink data; if the plurality of SSBs are not received, second downlink data is received in a second preset time period to attempt to extract the plurality of SSBs from the second downlink data, wherein the second preset time period is after the first preset time period, and an interval exists between the second preset time period and the first preset time period.
Optionally, the duration of the second preset time period is equal to the duration of the first preset time period.
Optionally, the receiving method of the SSB further includes: and if the plurality of SSBs are extracted from the second downlink data, selecting the strongest SSB from the plurality of SSBs, wherein the strongest SSB refers to the SSB with the strongest signal in the plurality of SSBs.
Optionally, the period of the SSB is 40ms, and an interval between the start time of the second preset time period and the end time of the first preset time period is 40 ms.
Optionally, the receiving method of the SSB further includes: receiving third downlink data in a third preset time period to attempt to extract the plurality of SSBs from the third downlink data if the plurality of SSBs are not extracted from the first downlink data and the second downlink data; and the third preset time period is after the second preset time period, and the duration of the third preset time period is equal to the duration of the first preset time period.
Optionally, the period of the SSB is 80ms, a time difference between the start time of the second preset time period and the end time of the first preset time period is 20ms, and an interval between the start time of the third preset time period and the end time of the second preset time period is 40 ms.
Optionally, the receiving method of the SSB further includes: receiving fourth downlink data in a fourth preset time period to attempt to extract the plurality of SSBs from the fourth downlink data if the plurality of SSBs are not extracted from the first downlink data, the second downlink data and the third downlink data; and the fourth preset time period is after the third preset time period, and the duration of the fourth preset time period is equal to the duration of the third preset time period.
Optionally, the duration of the first preset time period is 20ms, and the duration of the second preset time period is 20 ms.
To solve the foregoing technical problem, an embodiment of the present invention further provides a receiving apparatus for an SSB, including: a first receiving module, configured to receive first downlink data in a first preset time period to attempt to extract a plurality of SSBs from the first downlink data; a second receiving module, configured to receive second downlink data in a second preset time period if the plurality of SSBs are not received, so as to attempt to extract the plurality of SSBs from the second downlink data; the second preset time period is after the first preset time period, and an interval is formed between the second preset time period and the first preset time period.
To solve the above technical problem, an embodiment of the present invention further provides a storage medium having stored thereon computer instructions, where the computer instructions execute the steps of the above method when executed.
In order to solve the foregoing technical problem, an embodiment of the present invention further provides a terminal, including a memory and a processor, where the memory stores computer instructions executable on the processor, and the processor executes the computer instructions to perform the steps of the foregoing method.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides a method for receiving an SSB (secure State broadcast), which comprises the following steps: receiving first downlink data at a first preset time period to attempt to extract a plurality of SSBs from the first downlink data; if the plurality of SSBs are not received, receiving second downlink data in a second preset time period to attempt to extract the plurality of SSBs from the second downlink data; the second preset time period is after the first preset time period, and an interval is formed between the second preset time period and the first preset time period. When the plurality of SSBs are not received in the first preset time period, the embodiments of the present invention may receive the plurality of SSBs in the second preset time period spaced from the first preset time period. Compared with the prior art, the SSB receiving method provided by the embodiment of the present invention can flexibly select the downlink data receiving length according to the actual application scenario, comprehensively consider the offline processing time, and perform network search for different SSB periods. Compared with the prior art scheme of receiving the longest SSB period, the embodiment of the invention can continue network search only under the condition that the SSB is not obtained, does not influence the network search speed of the short SSB period, and can effectively save the storage space.
Further, the receiving method of the SSB further includes: and if the plurality of SSBs are extracted from the second downlink data, selecting the strongest SSB from the plurality of SSBs, wherein the strongest SSB refers to the SSB with the strongest signal in the plurality of SSBs. After receiving the SSBs with the number exceeding the preset number, the embodiment of the invention can select the strongest SSBs, thereby further providing possibility for reducing the network search time and improving the network search speed.
Drawings
Fig. 1 is a flowchart illustrating a method for receiving SSB according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a receiving method of an SSB with an SSB period of 40ms according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a receiving method of an SSB with an SSB period of 80ms according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a receiving apparatus of an SSB according to an embodiment of the present invention.
Detailed Description
As background, the prior art reception of SSBs has drawbacks.
In the prior art, in order to adapt to different application scenarios, NR defines an SSB period as a variable period, so User Equipment (User Equipment, UE for short) needs to support network searching of different SSB periods. The 3GPP protocol also indicates that in the initial network search selection, the UE may assume an SSB period of 20 ms. Therefore, the conventional method usually takes 20ms of data to perform Synchronization of Primary Synchronization Signal (PSS)/Secondary Synchronization Signal (SSS) offline, and finds the strongest SSB.
Then, the UE may receive Master Information Block (MIB) data for decoding. Alternatively, if no SSB is found, the data can be collected for a longer time according to the SSB period configured by the cell, provided, of course, that the SSB period is known to the UE. Or, each network search receives data with the longest SSB period (e.g., 160ms), which causes waste of memory space and affects network search speed.
To solve the foregoing technical problem, an embodiment of the present invention provides a method for receiving an SSB, including: receiving first downlink data at a first preset time period to attempt to extract a plurality of SSBs from the first downlink data; if the plurality of SSBs are not received, receiving second downlink data in a second preset time period to attempt to extract the plurality of SSBs from the second downlink data; the second preset time period is after the first preset time period, and an interval is formed between the second preset time period and the first preset time period.
When the plurality of SSBs are not received in the first preset time period, the embodiments of the present invention may receive the plurality of SSBs in the second preset time period spaced from the first preset time period. Compared with the prior art, the SSB receiving method provided by the embodiment of the present invention can flexibly select the downlink data receiving length according to the actual application scenario, comprehensively consider the offline processing time, and perform network search for different SSB periods. Compared with the prior art scheme of receiving the longest SSB period, the embodiment of the invention can continue network search only under the condition that the SSB is not obtained, does not influence the network search speed of the short SSB period, and can effectively save the storage space.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a flowchart illustrating a method for receiving an SSB according to an embodiment of the present invention. The receiving method may be performed by the terminal side, e.g., by the NR UE. Specifically, the receiving method may include the steps of:
step S101, receiving first downlink data in a first preset time period to attempt to extract a plurality of SSBs from the first downlink data;
step S102, if the SSBs are not received, receiving second downlink data in a second preset time period to attempt to extract the SSBs from the second downlink data.
The second preset time period is after the first preset time period, and an interval is formed between the second preset time period and the first preset time period.
Typically, all SSBs will be sent out within 5 ms. If the base station issues the SSBs, then all SSB beams will be included in the 20ms data transmission. In step S101, the UE may receive first downlink data for a first preset time period and attempt to extract a plurality of SSBs therefrom. In one non-limiting example, the duration of the first preset time period may be 20 ms. If the network search information is obtained by receiving the plurality of SSBs, the UE may receive all the SSBs and find out the strongest SSB.
In step S102, if the SSBs are not extracted from the first preset time period, the UE may receive second downlink data in a second preset time period and attempt to extract the SSBs from the second downlink data. The duration of the second preset time period may be equal to the duration of the first preset time period. The duration of the second preset time period may also be 20 ms. If the plurality of SSBs are extracted from the second downlink data and network search information is obtained, the UE may receive the plurality of SSBs and find out the strongest SSB.
In one embodiment, the SSB period is 40ms, and the time difference between the start time of the second preset time period and the end time of the first preset time period may be 40 ms.
Further, if the plurality of SSBs are extracted from the second downlink data, the UE may select a strongest SSB from the plurality of SSBs, where the strongest SSB refers to an SSB with a strongest signal among all the SSBs. Then, the UE may receive the MIB according to the strongest SSB to obtain the main system information.
As a variation, if the plurality of SSBs are not extracted from the first downlink data and the second downlink data, the UE may receive third downlink data for a third preset time period and attempt to extract the plurality of SSBs from the third downlink data. And the third preset time period is after the second preset time period, and the duration of the third preset time period is equal to the duration of the first preset time period. The duration of the third preset time period may be 20 ms. If the plurality of SSBs are extracted for the third preset time period, resulting in network search information, the UE may stop receiving the plurality of SSBs.
Further, if the plurality of SSBs are not extracted from the first downlink data, the second downlink data, and the third downlink data, the UE may receive fourth downlink data for a fourth preset time period to attempt to extract the plurality of SSBs from the fourth downlink data. And the fourth preset time period is after the third preset time period, and the duration of the fourth preset time period is equal to the duration of the third preset time period. The duration of the fourth preset time period may be 20 ms. The time of the fourth preset time period and the third preset time period may be 20 ms.
In a non-limiting example, the SSB period is 80ms, an interval between the start time of the second preset time period and the end time of the first preset time period may be 20ms, a time difference between the start time of the third preset time period and the end time of the second preset time period is 40ms, and a time difference between the start time of the third preset time period and the end time of the fourth preset time period is 20 ms. The duration of the third preset time period may be 20 ms.
The following describes the embodiments of the present invention by taking the SSB period of 40,80,160 ms as an example in the NR technique.
Since the 3GPP protocol recommends a 20ms SSB period for initial cell selection, the UE can receive 20ms of data for offline PSS/SSS processing. When the offline PSS/SSS processing is performed, the longest offline processing time required by the UE will reach 15 ms. When the SSB period is {5,10,20} ms, the UE receives a set of 20ms downlink data to find all SSBs of the cell, and obtains the strongest SSB.
However, when the SSB period is {40,80,160} ms, it may need to collect multiple sets of 20ms downlink data to find the time domain location of the SSB.
Fig. 2 is a schematic diagram of a receiving method of an SSB with an SSB period of 40ms according to an embodiment of the present invention. Assume that the first preset time period is 20ms and the second preset time period is 20 ms. And the interval between the starting time of the second preset time period and the ending time of the first preset time period is 40 ms. Referring to fig. 2, the UE collects downlink data of a first group of 20ms in the first preset time period and performs offline PSS/SSS processing, which requires 20+15 to 35 ms.
If the SSB is found at this time, the UE may stop receiving downlink data; if the SSB cannot be found, the UE may continue to receive 20ms downlink data in the second preset time period, and perform offline PSS/SSS processing again. Those skilled in the art understand that when the SSB period is 40ms, the maximum time period for UE reception is 40ms, and all the SSBs can be received. That is, all SSBs can be received by receiving downlink data in the first preset time period and the second preset time period at most.
Fig. 3 is a schematic diagram of a receiving method of an SSB with an SSB period of 80ms according to an embodiment of the present invention. Assume that the first preset time period is 20ms, the second preset time period is 20ms, the third preset time period is 20ms, and the fourth preset time period is 20 ms. The interval between the starting time of the second preset time period and the ending time of the first preset time period is 20ms, the interval between the starting time of the second preset time period and the ending time of the third preset time period is 40ms, and the interval between the ending time of the third preset time period and the starting time of the fourth preset time period is 20 ms. Referring to fig. 3, the UE collects downlink data of a first group of 20ms in the first preset time period and performs offline PSS/SSS processing, which requires 20+15 to 35 ms.
If an SSB is found at this time, the UE may stop receiving the next set of 20ms downlink data; if the SSB cannot be found, the UE may continue to receive 20ms downlink data for the second preset time period to perform the next set of offline PSS/SSS processing.
Further, if the SSB is not found yet, the UE may continue to receive 20ms downlink data for the third preset time period to perform the next set of offline PSS/SSS processing. If the SSB is found at this time, the UE may stop receiving subsequent downlink data, otherwise, the UE may receive the downlink data in the fourth preset time period. Since the SSB period is assumed to be 80ms, all SSBs are certainly available at this time for network search.
Those skilled in the art understand that when the SSB period is 80ms, all the delivered SSBs may appear in the first preset time period, the second preset time period, the third preset time period, or the fourth preset time period, and the UE may stop receiving subsequent data after receiving the SSBs in any preset time period.
In fig. 2 and 3, the diagonal grids and the horizontal grids both represent SSBs, and different filling manners are adopted to distinguish whether the UE receives the SSBs in the corresponding downlink data.
Further, those skilled in the art can understand that, if the SSB period is 160ms and the SSB is located in the last 20ms of the 160ms, after receiving the first 20ms downlink data of the first preset time period (the termination time of the first preset time period is denoted by T1), the UE does not receive the SSB and receives the second 20ms downlink data at the time T1+20 ms; further, a third 20ms downlink data is received at T1+60 ms; further, receiving fourth 20ms downlink data at T1+100 ms; further, a fourth 20ms downlink data is received at T1+160 ms; further, receiving fifth 20ms downlink data at T1+200 ms; further, the sixth 20ms downlink data is received at T1+240 ms; further, seventh 20ms downlink data is received at T1+280 ms; further, the eighth 20ms downlink data is received at T1+320ms, and all SSBs in the 160ms period can be obtained at this time. Those skilled in the art will appreciate that this is the worst case for receiving a 160ms periodic SSB with a small probability.
Therefore, the embodiment of the invention can flexibly receive all SSBs according to the actual application scene so as to find the strongest SSB to carry out network search as much as possible. Compared with the prior art scheme of receiving the longest SSB period, the embodiment of the invention can continue network search only under the condition that the SSB is not obtained, does not influence the network search speed of the short SSB period, and can effectively save the storage space.
Fig. 4 is a schematic structural diagram of a receiving apparatus of an SSB according to an embodiment of the present invention. The receiving apparatus 4 of the SSB (hereinafter referred to as the receiving apparatus 4) may implement the method solutions shown in fig. 1 to fig. 3, and be executed by a terminal, for example, an NR terminal.
Specifically, the receiving apparatus 4 may include: a first receiving module 41, configured to receive first downlink data in a first preset time period to attempt to extract multiple SSBs from the first downlink data; a second receiving module 42, if the SSBs are not received, the second receiving module 42 is configured to receive second downlink data in a second preset time period, so as to attempt to extract the SSBs from the second downlink data; the second preset time period is after the first preset time period, and an interval is formed between the second preset time period and the first preset time period.
In a specific implementation, the duration of the second preset time period may be equal to the duration of the first preset time period.
In a specific implementation, the receiving device 4 may further include: a selection module (not shown). If the plurality of SSBs are extracted from the second downlink data, the selecting module is configured to select a strongest SSB from the plurality of SSBs, where the strongest SSB refers to an SSB with a strongest signal among the plurality of SSBs.
In a specific implementation, the period of the SSB is 40ms, and an interval between the start time of the second preset time period and the end time of the first preset time period is 40 ms.
In a specific implementation, the receiving device 4 may further include: a third receiving module (not shown), configured to receive third downlink data in a third preset time period to attempt to extract the SSBs from the third downlink data if the SSBs are not extracted from the first downlink data and the second downlink data; and the third preset time period is after the second preset time period, and the duration of the third preset time period is equal to the duration of the first preset time period.
In a specific implementation, the period of the SSB is 80ms, a time difference between a start time of the second preset time period and an end time of the first preset time period is 20ms, and an interval between a start time of the third preset time period and an end time of the second preset time period is 40 ms.
In a specific implementation, the receiving device 4 may further include: a fourth receiving module (not shown), configured to receive fourth downlink data in a fourth preset time period to attempt to extract the SSBs from the fourth downlink data if the SSBs are not extracted from the first downlink data, the second downlink data, and the third downlink data; and the fourth preset time period is after the third preset time period, and the duration of the fourth preset time period is equal to the duration of the third preset time period.
For more details of the operation principle and the operation mode of the receiving apparatus 4, reference may be made to the description in fig. 1 to fig. 3, which is not repeated here.
Further, the embodiment of the present invention further discloses a storage medium, on which computer instructions are stored, and when the computer instructions are executed, the method technical solution described in the embodiments shown in fig. 1 to fig. 3 is executed. Preferably, the storage medium may include a computer-readable storage medium such as a non-volatile (non-volatile) memory or a non-transitory (non-transient) memory. The computer readable storage medium may include ROM, RAM, magnetic or optical disks, and the like.
Further, an embodiment of the present invention further discloses a terminal, 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 method technical solution described in the embodiments shown in fig. 1 to fig. 3 when running the computer instruction. Preferably, the terminal may be an NR UE.
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 (11)
1. A method of receiving SSB, comprising:
receiving first downlink data at a first preset time period to attempt to extract a plurality of SSBs from the first downlink data;
if the plurality of SSBs are not received, receiving second downlink data in a second preset time period to attempt to extract the plurality of SSBs from the second downlink data;
the second preset time period is after the first preset time period, and an interval is formed between the second preset time period and the first preset time period; the first preset time period is 20ms, the second preset time period is 20ms, and the interval between the starting time of the second preset time period and the ending time of the first preset time period is an integral multiple of 20 ms.
2. The receiving method of SSB according to claim 1, wherein the duration of the second predetermined time period is equal to the duration of the first predetermined time period.
3. The SSB receiving method according to claim 1, further comprising:
and if the plurality of SSBs are extracted from the second downlink data, selecting the strongest SSB from the plurality of SSBs, wherein the strongest SSB refers to the SSB with the strongest signal in the plurality of SSBs.
4. The SSB receiving method according to claim 1, wherein a period of the SSB is 40ms, and an interval between a start time of the second preset time period and an end time of the first preset time period is 40 ms.
5. The SSB receiving method according to claim 1, further comprising:
receiving third downlink data in a third preset time period to attempt to extract the plurality of SSBs from the third downlink data if the plurality of SSBs are not extracted from the first downlink data and the second downlink data;
and the third preset time period is after the second preset time period, and the duration of the third preset time period is equal to the duration of the first preset time period.
6. The receiving method of the SSB according to claim 5, wherein a period of the SSB is 80ms, a time difference between a start time of the second preset time period and an end time of the first preset time period is 20ms, and an interval between the start time of the third preset time period and the end time of the second preset time period is 40 ms.
7. The receiving method of SSB according to claim 5, further comprising:
receiving fourth downlink data in a fourth preset time period to attempt to extract the plurality of SSBs from the fourth downlink data if the plurality of SSBs are not extracted from the first downlink data, the second downlink data and the third downlink data;
and the fourth preset time period is after the third preset time period, and the duration of the fourth preset time period is equal to the duration of the third preset time period.
8. The receiving method of SSB according to any of claims 1 to 7, wherein the duration of the first predetermined time period is 20ms and the duration of the second predetermined time period is 20 ms.
9. An apparatus for receiving an SSB, comprising:
a first receiving module, configured to receive first downlink data in a first preset time period to attempt to extract a plurality of SSBs from the first downlink data;
a second receiving module, configured to receive second downlink data in a second preset time period if the plurality of SSBs are not received, so as to attempt to extract the plurality of SSBs from the second downlink data;
the second preset time period is after the first preset time period, and an interval is formed between the second preset time period and the first preset time period; the first preset time period is 20ms, the second preset time period is 20ms, and the interval between the starting time of the second preset time period and the ending time of the first preset time period is an integral multiple of 20 ms.
10. A storage medium having stored thereon computer instructions, which when executed by a processor, perform the steps of the method of any one of claims 1 to 8.
11. A terminal 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 steps of the method of any one of claims 1 to 8.
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