CN111294187B - Initial access method, user equipment and computer readable storage medium - Google Patents

Initial access method, user equipment and computer readable storage medium Download PDF

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CN111294187B
CN111294187B CN201910605373.4A CN201910605373A CN111294187B CN 111294187 B CN111294187 B CN 111294187B CN 201910605373 A CN201910605373 A CN 201910605373A CN 111294187 B CN111294187 B CN 111294187B
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symbol
symbols
resource set
control resource
synchronization
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CN111294187A (en
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周欢
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Beijing Ziguang Zhanrui Communication Technology Co Ltd
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Beijing Ziguang Zhanrui Communication Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0035—Synchronisation arrangements detecting errors in frequency or phase

Abstract

An initial access method, user equipment and a computer readable storage medium are provided, the initial access method includes: searching a synchronous signal to obtain a synchronous block index corresponding to the synchronous signal; determining synchronous timing according to the synchronous block index and the time domain position corresponding to the SSB, and performing uplink synchronization; two SSBs are included in one slot, and each SSB occupies 4 consecutive symbols; and after finishing the uplink synchronization, executing the initial access operation. By adopting the scheme, the corresponding control resource set can be flexibly configured in one time slot, and the configured control resource set can occupy 3 continuous symbols at most.

Description

Initial access method, user equipment and computer readable storage medium
Technical Field
The present invention relates to the field of wireless communications, and in particular, to an initial access method, a user equipment, and a computer-readable storage medium.
Background
The main functions of the downlink synchronization channel are cell ID detection and time-frequency domain synchronization. In satellite internet communication, synchronization channels include a Primary Synchronization Channel (PSCH) and a Secondary Synchronization Channel (SSCH). The Synchronization Channel and a Physical Broadcast Channel (PBCH) constitute a Synchronization Signal Block (SSB).
In an existing New Radio (NR) system, the maximum number of continuous symbols occupied by a control resource set (CORESET) in a time slot is 3. However, in the existing timeslot, the configured control resource set only occupies 2 consecutive symbols.
Disclosure of Invention
The problem to be solved by the embodiments of the present invention is that a control resource set configured in a timeslot cannot occupy 3 consecutive symbols.
To solve the foregoing technical problem, an embodiment of the present invention provides an initial access method, including: searching a synchronous signal to obtain a synchronous block index corresponding to the synchronous signal; determining synchronous timing according to the synchronous block index and the time domain position corresponding to the SSB, and performing uplink synchronization; two SSBs are included in one slot, and each SSB occupies 4 consecutive symbols; and after finishing the uplink synchronization, executing initial access operation.
Optionally, the one timeslot further includes a control resource set, and the number of symbols occupied by the control resource set is any one of 1, 2, and 3.
Optionally, the number of symbols occupied by the control resource set included in the time slot is 3, and the corresponding symbols are in turn: symbol 1 to symbol 3.
Optionally, symbols corresponding to two SSBs included in one timeslot are: symbol 4 to symbol 7, and symbol 9 to symbol 12.
Optionally, the symbols corresponding to the two SSBs included in one timeslot are sequentially: symbol 4 to symbol 7, and symbol 10 to symbol 13.
Optionally, after completing the uplink synchronization, the method further includes: receiving MIB information, wherein the MIB information carries identification information used for indicating SIB 1PDCCH information, and the identification information used for indicating SIB 1PDCCH information is used for indicating the RB number, the symbol length, the frequency domain offset with SSB and the search space period of a control resource set associated with the SIB 1PDCCH information.
An embodiment of the present invention further provides a user equipment, including: a search unit for searching for a synchronization signal; an obtaining unit, configured to obtain a synchronization block index corresponding to the synchronization signal; a synchronization unit, configured to determine synchronization timing according to the synchronization block index and a time domain position corresponding to the SSB, and perform uplink synchronization; two SSBs are included in one slot, and each SSB occupies 4 consecutive symbols; and the access unit is used for executing initial access operation after finishing uplink synchronization.
Optionally, the one timeslot further includes a control resource set, and the number of symbols occupied by the control resource set is any one of 1, 2, and 3.
Optionally, the number of symbols occupied by the control resource set included in the time slot is 3, and the corresponding symbols are in turn: symbol 1 to symbol 3.
Optionally, symbols corresponding to two SSBs included in one timeslot are: symbol 4 to symbol 7, and symbol 9 to symbol 12.
Optionally, the symbols corresponding to the two SSBs included in one timeslot are sequentially: symbol 4 to symbol 7, and symbol 10 to symbol 13.
Optionally, the user equipment further includes: a receiving unit, configured to receive MIB information after the synchronization unit completes uplink synchronization, where the MIB information carries identification information used to indicate SIB 1PDCCH information, and the identification information used to indicate SIB 1PDCCH information is used to indicate the number of RBs, symbol length, frequency domain offset with SSB, and search space period of a control resource set associated with the SIB 1PDCCH information.
An embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium is a non-volatile storage medium or a non-transitory storage medium, and has computer instructions stored thereon, and when the computer instructions are executed, the computer instructions perform any of the steps of the initial access method described above.
The embodiment of the present invention further provides another user equipment, which includes a memory and a processor, where the memory stores computer instructions executable on the processor, and the processor executes the computer instructions to perform any of the steps of the initial access method described above.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
two SSBs and a control resource set are included in one time slot, each SSB occupies 4 continuous symbols, and each control resource set occupies 3 continuous symbols, so that 3 continuous symbols are indicated for the control resource set in one time slot.
Further, since the SIB 1PDCCH information is indicated by the MIB information, it is not necessary to indicate the SIB 1PDCCH information using dedicated information, and thus signaling overhead required for indicating the SIB 1PDCCH information can be reduced.
Drawings
Fig. 1 is a flowchart of an initial access method in an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating distribution of resources corresponding to symbols in a timeslot according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating distribution of resources corresponding to symbols in another timeslot according to another embodiment of the present invention;
fig. 4 is a schematic diagram illustrating distribution of resources corresponding to symbols in another timeslot according to another embodiment of the present invention;
fig. 5 is a schematic structural diagram of a user equipment in an embodiment of the present invention.
Detailed Description
In the prior art, two Synchronization Signal Blocks (SSBs), 2 reference signals and 2 sets of control resources are included in one timeslot. One slot includes 14 symbols, one SSB occupies 4 consecutive symbols, and 1 reference symbol occupies 1 symbol. Thus, one set of control resources occupies only 2 consecutive symbols.
It can be seen that, although the existing protocol specifies that the maximum number of consecutive symbols occupied by the control resource set in one slot is 3, in practical application, the control resource set in one slot actually occupies only 2 consecutive symbols.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
An initial access method is provided in an embodiment of the present invention, and is described in detail below with reference to fig. 1 through specific steps.
Step S101, searching a synchronous signal and acquiring a synchronous block index corresponding to the synchronous signal.
In a specific implementation, a specific implementation process and a working principle of searching for a synchronization signal and acquiring a synchronization block index corresponding to the synchronization signal may refer to the prior art, which is not described in detail herein.
And step S102, determining synchronous timing according to the synchronous block index and the time domain position corresponding to the SSB, and performing uplink synchronization.
In a specific implementation, a slot may include two SSBs, and each SSB occupies 4 consecutive symbols. The base station may agree with the user equipment about the location of the SSB in advance, so that after receiving the synchronization signal, the user equipment may determine the synchronization information according to the synchronization block index and the time domain location of the SSB in the time slot to perform synchronization timing.
In practical applications, one slot corresponds to 14 symbols, and therefore, except for symbols occupied by two SSBs, a Common Reference Signal (CRS) and a PDCCH may be disposed on other symbols.
In a specific implementation, 6 symbols remain unused, in addition to the symbols occupied by two SSCs. In the embodiment of the present invention, a CRS may be configured on the first symbol, that is, symbol 0. The remaining symbols may be configured with a set of control resources, or with other information.
In a specific implementation, the number of symbols occupied by the control resource set may be 1, 2, or 3. To transmit more control information, the set of control resources may occupy 3 consecutive symbols.
In a specific implementation, one timeslot may include two SSBs, where the first SSB may correspond to positions from symbol 4 to symbol 7, and the other SSB may correspond to positions from symbol 9 to symbol 12.
In this slot, the positions of the control resource sets are symbol 1 to symbol 3.
Referring to fig. 2, a schematic distribution diagram of resources corresponding to symbols in a timeslot in the embodiment of the present invention is shown.
In fig. 2, the number of symbols corresponding to one slot is 14. The first symbol is symbol 0 and the last symbol is symbol 13. A Common Reference Signal (CRS) is located at symbol 0, 3 symbols corresponding to the control resource set are symbols 1 to 3, symbols corresponding to the first SSB are symbols 4 to 7, the auxiliary CRS is located at symbol 8, symbols corresponding to the second SSB are symbols 9 to 11, and no information is carried on symbol 13.
In a specific implementation, the positions corresponding to the first SSB may be from symbol 4 to symbol 7, and the positions corresponding to the other SSB may be from symbol 10 to symbol 13. In this slot, the positions of the control resource sets are symbol 1 to symbol 3.
Referring to fig. 3, a schematic distribution diagram of resources corresponding to symbols in another timeslot in the embodiment of the present invention is shown.
In fig. 3, the number of symbols corresponding to one slot is 14. The first symbol is symbol 0 and the last symbol is symbol 13. A Common Reference Signal (CRS) is located at symbol 0, 3 symbols corresponding to the control resource set are symbols 1 to 3, a symbol corresponding to the first SSB is symbols 4 to 7, the auxiliary CRS is located at symbol 8, a symbol corresponding to the second SSB is symbols 10 to 13, and no information is carried on symbol 9.
In a specific implementation, the auxiliary CRS in fig. 2 and 3 may be configured by the base station through higher layer signaling. For example, the base station configures the secondary CRS for the ue through Radio Resource Control (RRC) signaling. In practical applications, the base station may not need to configure the secondary CRS for the ue, and at this time, the distribution of the resources corresponding to the symbols in the timeslot may refer to fig. 4.
Referring to fig. 4, a schematic diagram of distribution of resources corresponding to symbols in a timeslot in another embodiment of the present invention is shown.
In fig. 4, CRS is located at symbol 0, 3 symbols corresponding to the control resource set are symbols 1 to 3, symbols corresponding to the first SSB are symbols 4 to 7, symbols corresponding to the second SSB are symbols 10 to 13, and no information is carried on symbol 8 and symbol 9.
Step S103, after finishing the uplink synchronization, executing the initial access operation.
In a specific implementation, the user equipment may perform an initial access operation after completing uplink synchronization.
In a specific implementation, after completing the uplink synchronization, information of a Master Information Block (MIB) may also be received, where the MIB information carries identification information used to indicate System Information Block (SIB) 1PDCCH information. In this embodiment of the present invention, the identification information for indicating the SIB 1PDCCH information may be used to indicate the number of Resource Blocks (RBs) of a control Resource set associated with the SIB 1PDCCH information, a symbol length, a frequency domain offset from the SSB, and a search space period.
In the embodiment of the present invention, referring to table 1 below, a mapping table of identification information and SSB information in the embodiment of the present invention is given.
TABLE 1
Figure BDA0002120629430000061
In the embodiment of the invention, the information of SSB 1PDCCH is indicated by the MIB information, so that the signaling overhead can be reduced.
Referring to fig. 5, a user equipment 50 in the embodiment of the present invention is provided, including: a search unit 501, an acquisition unit 502, a synchronization unit 503, and an access unit 504, wherein:
a searching unit 501, configured to search for a synchronization signal;
an obtaining unit 502, configured to obtain a synchronization block index corresponding to the synchronization signal;
a synchronization unit 503, configured to determine synchronization timing according to the synchronization block index and a time domain position corresponding to the SSB, and perform uplink synchronization; two SSBs are included in one slot, and each SSB occupies 4 consecutive symbols;
an accessing unit 504, configured to perform an initial accessing operation after completing the uplink synchronization.
In a specific implementation, the one timeslot further includes a control resource set, and the number of symbols occupied by the control resource set is any one of 1, 2, and 3.
In a specific implementation, the number of symbols occupied by the control resource set included in the timeslot is 3, and the corresponding symbols are, in order: symbol 1 to symbol 3.
In a specific implementation, the symbols corresponding to two SSBs included in one timeslot may be: symbol 4 to symbol 7, and symbol 9 to symbol 12.
In a specific implementation, the symbols corresponding to two SSBs included in one timeslot may be: symbol 4 to symbol 7, and symbol 10 to symbol 13.
In a specific implementation, the user equipment 50 may further include: a receiving unit (not shown in fig. 5), configured to receive MIB information after the synchronization unit 504 completes uplink synchronization, where the MIB information carries identification information used to indicate SIB 1PDCCH information, and the identification information used to indicate SIB 1PDCCH information is used to indicate the number of RBs of the control resource set associated with the SIB 1PDCCH information, a symbol length, a frequency domain offset associated with the SSB, and a search space period.
An embodiment of the present invention provides a computer-readable storage medium, which is a non-volatile storage medium or a non-transitory storage medium, and has computer instructions stored thereon, where the computer executes, when running, the steps of performing the initial access method provided in the above-mentioned embodiment of the present invention.
Another user equipment according to an embodiment of the present invention includes 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 initial access method provided in the above embodiment of the present invention.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by instructing the relevant hardware through a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
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 (8)

1. An initial access method, comprising:
searching a synchronous signal to obtain a synchronous block index corresponding to the synchronous signal;
determining synchronous timing according to the synchronous block index and the time domain position corresponding to the SSB, and performing uplink synchronization; two SSBs are included in one slot, and each SSB occupies 4 consecutive symbols; the one time slot also comprises a control resource set, and the number of symbols occupied by the control resource set is 3; the symbols corresponding to the control resource set are symbols 1 to 3 in sequence; the symbols corresponding to two SSBs included in one timeslot are: symbol 4 to symbol 7, and symbol 9 to symbol 12; or, the symbols corresponding to the two SSBs included in one timeslot are: symbol 4 to symbol 7, and symbol 10 to symbol 13;
and after finishing the uplink synchronization, executing initial access operation.
2. The initial access method of claim 1, further comprising: the number of symbols occupied by the control resource set in the one time slot is 1 or 2.
3. The initial access method of claim 1, after completing uplink synchronization, further comprising:
receiving MIB information, wherein the MIB information carries identification information used for indicating SIB 1PDCCH information, and the identification information used for indicating SIB 1PDCCH information is used for indicating the RB number, the symbol length, the frequency domain offset with SSB and the search space period of a control resource set associated with the SIB 1PDCCH information.
4. A user device, comprising:
a search unit for searching for a synchronization signal;
an obtaining unit, configured to obtain a synchronization block index corresponding to the synchronization signal;
a synchronization unit, configured to determine synchronization timing according to the synchronization block index and a time domain position corresponding to the SSB, and perform uplink synchronization; two SSBs are included in one slot, and each SSB occupies 4 consecutive symbols; the one time slot also comprises a control resource set, and the number of symbols occupied by the control resource set is 3; the symbols corresponding to the control resource set are symbols 1 to 3 in sequence; the symbols corresponding to two SSBs included in one timeslot are: symbol 4 to symbol 7, and symbol 9 to symbol 12; or, the symbols corresponding to the two SSBs included in one timeslot are: symbol 4 to symbol 7, and symbol 10 to symbol 13;
and the access unit is used for executing initial access operation after finishing uplink synchronization.
5. The user equipment of claim 4, further comprising: the number of symbols occupied by the control resource set in the one time slot is 1 or 2.
6. The user equipment of claim 4, further comprising: a receiving unit, configured to receive MIB information after the synchronization unit completes uplink synchronization, where the MIB information carries identification information used to indicate SIB 1PDCCH information, and the identification information used to indicate SIB 1PDCCH information is used to indicate the number of RBs, the symbol length, the frequency domain offset from the SSB, and the search space period of a control resource set associated with the SIB 1PDCCH information.
7. A computer readable storage medium, being a non-volatile storage medium or a non-transitory storage medium, having computer instructions stored thereon, wherein the computer instructions, when executed by a processor, perform the steps of the initial access method according to any one of claims 1 to 3.
8. A user equipment comprising a memory and a processor, said memory having stored thereon computer instructions executable on said processor, wherein said processor, when executing said computer instructions, performs the steps of the initial access method according to any one of claims 1 to 3.
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