CN111417184A - Method for sending synchronization signal block and network equipment - Google Patents

Abstract

Embodiments of the present invention provide a method and a network device for sending a synchronization signal block. The method includes: determining the second transmission power of the remaining OFDM symbols in the SSB according to the first transmission power of the target OFDM symbol in the SSB; according to the first transmission power of the target OFDM symbol in the SSB; A transmit power and the second transmit power are used to determine a target transmit power; the SSB is sent by using the target transmit power. In this embodiment of the present invention, the network device determines the second transmit power of the remaining OFDM symbols in the SSB by using the first transmit power of the target OFDM symbol, and determines the target transmit power according to the first transmit power and the second transmit power, so that the SSB transmits The power is stable, reducing the difficulty for the terminal to detect the synchronization signal.

Description

A method and network device for sending synchronization signal blocks

technical field

Embodiments of the present invention relate to the field of communication technologies, and in particular, to a method and a network device for sending a synchronization signal block.

Background technique

The fifth generation communication technology ( ^5th generation, 5G) is the representative of the new generation of information technology, which introduces a new type of architecture and a variety of innovative key technologies. 5G targets three scenarios, namely Enhanced Mobile Broadband (eMBB), Ultra-Reliable and Low Latency Communications (URLLC), and Massive Machine Type of Communication (mMTC) . Among them, eMBB is the most important application scenario for the initial commercial use of 5G, which provides higher system capacity, higher data throughput, more seamless wireless connection, and better user experience.

In 5G New Radio (NR), a terminal (UE) acquires time and frequency synchronization with a serving cell based on a synchronization signal block (Synchronization Signal and PBCH block, SSB) sent by a network device.

Referring to FIG. 1 , a primary synchronization signal (Primary Synchronization Signal, PSS), a secondary synchronization signal (Secondary Synchronization Signal, SSS) and a physical broadcast channel (Physical broadcast channel, PBCH) together constitute an SSB (SS/PBCH block). As shown in Figure 1, an SSB consists of 4 Orthogonal Frequency Division Multiplex (OFDM) symbols. The symbols are numbered in increasing order from 0 to 3 in the SSB. PSS, SSS, and PBCH occupy different symbols. . In the frequency domain, one SSB consists of 240 consecutive subcarriers, and the subcarriers are numbered in increasing order from 0 to 239 in the SSB.

In the fourth generation communication technology (4th generation, 4G), the network equipment transmits the power according to the resource element (Resource Element, RE) level of all downlink channels and uses the Cell Reference Signal (CRS) as the power reference. 5G network equipment The implementation of 5G network equipment will also follow the 4G practice, and the CRS has been cancelled in the 5G protocol. The implementation of 5G network equipment is based on the energy per resource element (EPRE) of each PBCH resource unit. Configure the transmit power of SSB. Since the UE can read the broadcast message after receiving the SSB synchronization, the coverage of the synchronization signal in the prior art is weaker than that of the PBCH. Even if the UE receives the PBCH, it may not be able to read the broadcast message due to the inability to synchronize. When the network device sends the SSB, the "zero" part indicates that the transmit power is 0, which causes the transmit power to be unstable when the network device sends the SSB. The rapid transformation of transmit power has higher requirements on the stability of the radio frequency module of network equipment. In this process, the transmit power of PSS and SSS is lower than that of PBCH, which increases the difficulty of detecting PSS and SSS by the terminal.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a method and network device for sending a synchronization signal block, which solve the problem that the transmission power of the SSB is unstable because the transmission power of the synchronization signal in the SSB is lower than that of the PBCH, which increases the difficulty of detecting the synchronization signal by the terminal.

According to a first aspect of the embodiments of the present invention, there is provided a method for sending a synchronization signal block, which is applied to a network device, the method comprising: according to a first transmission of a target OFDM symbol in the synchronization signal block SSB power, determine the second transmit power of the remaining OFDM symbols in the SSB; determine the target transmit power according to the first transmit power and the second transmit power; send the SSB through the target transmit power.

Optionally, the determining the second transmit power of the remaining OFDM symbols in the SSB according to the first transmit power of the target OFDM symbol in the SSB includes: determining the first transmit power of the target OFDM symbol in the SSB is the second transmit power of the remaining OFDM symbols in the SSB.

Optionally, the target OFDM symbol is OFDM symbol 1 or OFDM symbol 3.

Optionally, the determining the target transmission power according to the first transmission power and the second transmission power includes: calculating the target transmission power by the following formula:

Y ₀ =10lg(x′·N ₁ );

Y ₁ =10lg(x·N ₂ );

Y ₂ =10lg(x·N ₃ +x″·N ₁ );

Y ₃ =10lg(x·N ₂ );

Y=Y ₀ +Y ₁ +Y ₂ +Y ₃ ;

Among them, Y ₀ is the transmit power of OFDM symbol 0, Y ₁ is the transmit power of OFDM symbol 1, Y ₂ is the transmit power of OFDM symbol 2, Y ₃ is the transmit power of OFDM symbol 3, and Y is the target transmit power; N ₁ is the number of REs of the primary synchronization signal PSS corresponding to OFDM symbol 0, _N2 is the number of REs of PBCH corresponding to OFDM symbol 1 or ₃ , and N3 is the number of REs of PBCH corresponding to OFDM symbol 2 The number, N ₂ -N ₃ is the number of REs of the secondary synchronization signal SSS corresponding to OFDM symbol 2; x is the preset transmit power of each RE, and x' is the transmission of the REs of the PSS corresponding to OFDM symbol 0 Power, x" is the transmit power of the RE of the SSS corresponding to OFDM symbol 2.

According to a second aspect of the embodiments of the present invention, a network device is provided, including: a transceiver and a processor, wherein the processor is configured to determine the SSB according to the first transmit power of a target OFDM symbol in the SSB the second transmit power of the remaining OFDM symbols in the power to transmit the SSB.

Optionally, the processor is further configured to determine the first transmit power of the target OFDM symbol in the SSB as the second transmit power of the remaining OFDM symbols in the SSB.

Optionally, the target OFDM symbol is OFDM symbol 1 or OFDM symbol 3.

Optionally, the processor is further configured to calculate the target transmit power by the following formula:

Y ₀ =10lg(x′·N ₁ );

Y ₁ =10lg(x·N ₂ );

Y ₂ =10lg(x·N ₃ +x″·N ₁ );

Y ₃ =10lg(x·N ₂ );

Y _t =Y ₀ +Y ₁ +Y ₂ +Y ₃ ;

Among them, Y ₀ is the transmit power of OFDM symbol 0, Y ₁ is the transmit power of OFDM symbol 1, Y ₂ is the transmit power of OFDM symbol 2, Y ₃ is the transmit power of OFDM symbol 3, and Y _t is the target transmit power; N ₁ is the number of resource element REs of the primary synchronization signal PSS corresponding to OFDM symbol 0, N ₂ is the number of REs of PBCH corresponding to OFDM symbol 1 or 3, N ₃ is the RE of PBCH corresponding to OFDM symbol 2 N ₂ -N ₃ is the number of REs of the secondary synchronization signal SSS corresponding to OFDM symbol 2; x is the preset transmit power of each RE, and x' is the number of REs of the PSS corresponding to OFDM symbol 0 The transmit power, x" is the transmit power of the RE of the SSS corresponding to OFDM symbol 2.

According to a third aspect of the embodiments of the present invention, a network device is provided, including a processor, a memory, and a program stored on the memory and executable on the processor, when the program is executed by the processor The steps of implementing the method for transmitting a synchronization signal block as described in the first aspect.

According to a fourth aspect of the embodiments of the present invention, a computer-readable storage medium is provided, wherein a computer program is stored on the computer-readable storage medium, and the computer program is implemented as described in the first aspect when the computer program is executed by a processor. The steps of the method for transmitting a synchronization signal block described above.

In this embodiment of the present invention, the network device determines the second transmit power of the remaining OFDM symbols in the SSB by using the first transmit power of the target OFDM symbol, and determines the target transmit power according to the first transmit power and the second transmit power, and transmits through the target Power transmission SSB, so that the transmission power of the SSB is stable, reducing the difficulty of the terminal to detect the synchronization signal.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a schematic structural diagram of an existing synchronization information block;

FIG. 2 is a schematic structural diagram of a wireless communication system according to an embodiment of the present invention;

3 is a schematic flowchart of a method for sending a synchronization information block according to an embodiment of the present invention;

FIG. 4 is one of schematic structural diagrams of a network device provided by an embodiment of the present invention;

FIG. 5 is a second schematic structural diagram of a network device provided by an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Referring to FIG. 2, an embodiment of the present invention provides a wireless communication system. As shown in FIG. 2 , the wireless communication system may include: network equipment 21 and user equipment 22 . In practical applications, the connection between the above-mentioned various devices may be a wireless connection. In order to conveniently and intuitively represent the connection relationship between the various devices, a solid line is used in FIG. 2 for illustration.

It should be noted that the above communication system may include multiple user equipments, and the network equipment may communicate with multiple user equipments (transmit signaling or transmit data).

The above-mentioned network device may be a network device in a 5G system (eg, a next generation node base station (gNB) or a transmission and reception point (TRP)) and other devices.

The above-mentioned user equipment may be a mobile phone, a tablet computer, a notebook computer, an Ultra-Mobile Personal Computer (UMPC), a netbook, or a Personal Digital Assistant (Personal Digital Assistant, PDA).

Referring to FIG. 3 , an embodiment of the present invention provides a method for sending a synchronization signal block. The execution body of the method is a network device, and the specific steps are as follows:

Step 301: According to the first transmit power of the target OFDM symbol in the SSB, determine the second transmit power of the remaining OFDM symbols in the SSB;

In the embodiment of the present invention, one OFDM symbol in the SSB is used as a target OFDM symbol, and the first transmit power of the target OFDM symbol is used as a reference to determine the second transmit power of the remaining OFDM symbols in the SSB.

Optionally, the first transmission power is determined as the second transmission power, so that the transmission power of each OFDM symbol in the SSB is unified, and the transmission power of the entire SSB is stable during the transmission process.

Further, according to the structure of the SSB in FIG. 1 , it can be known that the transmit power of OFDM symbol 1 and OFDM symbol 3 are the same, and OFDM symbol 1 or OFDM symbol 3 is determined as the target OFDM symbol. In this way, while ensuring that the entire SSB transmit power is stable, the PSS and SSS transmit power is improved, and the physical downlink shared channel (Physical Downlink Shared Channel, PDSCH) will not be occupied, and the downlink transmission rate will not be affected. In addition, increasing the transmit power of PSS and SSS avoids the situation that the terminal only receives PBCH but not PSS and SSS when receiving SSB, and ensures that the terminal can read broadcast messages.

Step 302: Determine the target transmit power according to the first transmit power and the second transmit power;

In the embodiment of the present invention, the target transmit power of the entire SSB can be determined according to the first transmit power of the target OFDM symbol and the second transmit power of the target OFDM symbol and the OFDM symbol.

Specifically, the target transmit power is calculated by the following formula:

Y ₀ =10lg(x′·N ₁ );

Y ₁ =10lg(x·N ₂ );

Y ₂ =10lg(x·N ₃ +x″·N ₁ );

Y ₃ =10lg(x·N ₂ );

Y _t =Y ₀ +Y ₁ +Y ₂ +Y ₃ ;

Among them, Y ₀ is the transmit power of OFDM symbol 0, Y ₁ is the transmit power of OFDM symbol 1, Y ₂ is the transmit power of OFDM symbol 2, Y ₃ is the transmit power of OFDM symbol 3, and Y _t is the target transmit power; N ₁ is the number of resource element REs of the primary synchronization signal PSS corresponding to OFDM symbol 0, N ₂ is the number of REs of PBCH corresponding to OFDM symbol 1 or 3, N ₃ is the RE of PBCH corresponding to OFDM symbol 2 N ₂ -N ₃ is the number of REs of the secondary synchronization signal SSS corresponding to OFDM symbol 2; x is the preset transmit power of each RE, and x' is the number of REs of the PSS corresponding to OFDM symbol 0 Transmission power, x″ is the transmission power of the REs of the SSS corresponding to OFDM symbol 2. The preset transmission power of each RE can be obtained from the SSB downlink transmission power given by the parameter SS-PBCH-BlockPower provided by the upper layer. out.

Step 303: Send the SSB with the target transmit power.

In this embodiment of the present invention, the network device determines the second transmit power of the remaining OFDM symbols in the SSB by using the first transmit power of the target OFDM symbol, and determines the target transmit power according to the first transmit power and the second transmit power, and transmits through the target Power transmission SSB, so that the transmission power of the SSB is stable, reducing the difficulty of the terminal to detect the synchronization signal.

代入公式得到：1 and the formula in step 302 above, when OFDM symbol 0 is sent, the transmit power equivalent to 240 REs is aggregated on the 127 REs that transmit the PSS. At this time, the transmit power of each RE of the PSS is

Substitute into the formula to get:

此外由96个RE发送PBCH，代入公式得到：In the same way, when sending OFDM symbol 2, the transmit power equivalent to 144 REs is aggregated on the 127 REs that transmit SSS. At this time, the transmit power of each RE of SSS is

In addition, the PBCH is sent by 96 REs, which are substituted into the formula to obtain:

Y ₂ =10lg(x·96+x″·127)=10lgx+10lg(144+96)

=10lgx+10lg240;

When sending OFDM symbols 1 and 3, 240 REs send PBCH, and the formula is substituted to get:

Y ₁ =10lg(x·240)=10lgx+10lg240;

Y ₃ =10lg(x·240)=10lgx+10lg240;

The target transmit power of the entire SSB is calculated from OFDM symbols 0, 1, 2, and 3:

Y _t =Y ₀ +Y ₁ +Y ₂ +Y ₃ =40lgx+40lg240;

Compared with the existing method of sending SSB, the transmission power of each RE in the existing method is constant x ₀ , and it can be known by substituting into the formula:

When sending OFDM symbol 0, Y ₀ ′=10lg(x·127)=10lgx+10lg 127;

When sending OFDM symbol 1, Y ₁ ′=10lg(x·240)=10lgx+10lg240;

When sending OFDM symbol 2, Y ₂ ′=10lg(x·223)=10lgx+10lg223;

When sending OFDM symbol 3, Y ₃ ′=10lg(x·240)=10lgx+10lg240;

Total power of SSB: Y′ _t =Y′ ₀ +Y′ ₁ +Y′ ₂ +Y′ ₃

=40lgx+10(lg 127+lg240+lg223+lg240);

ΔY=Y _t -Y′ _t =10(2·lg240-lg127-lg223)=3.08dB;

It can be seen that, by using the method of the embodiment of the present invention, while ensuring the stability of the SSB transmission power, the transmission power is increased, thereby increasing the transmission distance and the network coverage.

Referring to FIG. 4, an embodiment of the present invention provides a network device 400, including: a transceiver 401 and a processor 402;

Wherein, the processor 402 is configured to determine the second transmit power of the remaining OFDM symbols in the synchronization signal block SSB according to the first transmit power of the target OFDM symbol;

The processor 402 is further configured to determine a target transmit power according to the first transmit power and the second transmit power;

The transceiver 401 is configured to transmit the SSB by using the target transmit power.

Optionally, the processor 402 is further configured to determine the first transmit power as the second transmit power.

Optionally, the target OFDM symbol is OFDM symbol 1 or OFDM symbol 3.

Optionally, the processor 402 is further configured to calculate the target transmit power by the following formula:

Y ₀ =10lg(x′·N ₁ );

Y ₁ =10lg(x·N ₂ );

Y ₂ =10lg(x·N ₃ +x″·N ₁ );

Y ₃ =10lg(x·N ₂ );

Y=Y ₀ +Y ₁ +Y ₂ +Y ₃ ;

Among them, Y ₀ is the transmit power of OFDM symbol 0, Y ₁ is the transmit power of OFDM symbol 1, Y ₂ is the transmit power of OFDM symbol 2, Y ₃ is the transmit power of OFDM symbol 3, and Y _t is the target transmit power; N ₁ is the number of resource element REs of the primary synchronization signal PSS corresponding to OFDM symbol 0, N ₂ is the number of REs of PBCH corresponding to OFDM symbol 1 or 3, N ₃ is the RE of PBCH corresponding to OFDM symbol 2 N ₂ -N ₃ is the number of REs of the secondary synchronization signal SSS corresponding to OFDM symbol 2; x is the preset transmit power of each RE, and x' is the number of REs of the PSS corresponding to OFDM symbol 0 The transmit power, x" is the transmit power of the RE of the SSS corresponding to OFDM symbol 2.

In this embodiment of the present invention, the network device determines the second transmit power of the remaining OFDM symbols in the SSB by using the first transmit power of the target OFDM symbol, and determines the target transmit power according to the first transmit power and the second transmit power, and transmits through the target Power transmission SSB, so that the transmission power of the SSB is stable, reducing the difficulty of the terminal to detect the synchronization signal.

Referring to FIG. 5, an embodiment of the present invention provides another network device 500, including: a processor 501, a transceiver 502, a memory 503, and a bus interface. Among them, the processor 501 may be responsible for managing the bus architecture and general processing. Memory 503 may store data used by processor 501 in performing operations.

In this embodiment of the present invention, the network device 500 may further include: a program stored in the memory 503 and executable on the processor 501 , and when the program is executed by the processor 501 , implements the steps of the method provided in the embodiment of the present invention.

In FIG. 5 , the bus architecture may include any number of interconnected buses and bridges, in particular one or more processors represented by processor 501 and various circuits of memory represented by memory 503 linked together. The bus architecture can also link together various other circuits, such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art, and therefore will not be further described in this embodiment of the present invention . The bus interface provides the interface. Transceiver 502 may be a number of elements, including a transmitter and a receiver, that provide means for communicating with various other devices over a transmission medium.

Embodiments of the present invention further provide a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, each process of the foregoing method embodiment can be achieved, and the same technical effect can be achieved, In order to avoid repetition, details are not repeated here. The computer-readable storage medium is, for example, a read-only memory (Read-Only Memory, ROM for short), a random access memory (Random Access Memory, RAM for short), a magnetic disk, or an optical disk.

It should be noted that, herein, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements, It also includes other elements not expressly listed or inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

The embodiments of the present invention have been described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific embodiments, which are merely illustrative rather than restrictive. Under the inspiration of the present invention, without departing from the spirit of the present invention and the scope protected by the claims, many forms can be made, which all belong to the protection of the present invention.

Claims (10)

1. A method for sending a synchronization signal block, applied to a network device, wherein the method comprises: According to the first transmit power of the target OFDM symbol in the synchronization signal block SSB, determine the second transmit power of the remaining OFDM symbols in the SSB; determining a target transmit power according to the first transmit power and the second transmit power; The SSB is transmitted with the target transmit power. 2. The method according to claim 1, wherein the determining the second transmit power of the remaining OFDM symbols in the SSB according to the first transmit power of the target OFDM symbol in the SSB comprises: The first transmit power of the target OFDM symbol in the SSB is determined as the second transmit power of the remaining OFDM symbols in the SSB. 3. The method of claim 2, wherein The target OFDM symbol is OFDM symbol 1 or OFDM symbol 3. 4. The method according to claim 3, wherein the determining the target transmit power according to the first transmit power and the second transmit power comprises: The target transmit power is calculated by the following formula: Y ₀ =10lg(x′·N ₁ ); Y ₁ =10lg(x·N ₂ ); Y ₂ =10lg(x·N ₃ +x″·N ₁ ); Y ₃ =10lg(x·N ₂ ); Y _t =Y ₀ +Y ₁ +Y ₂ +Y ₃ ;

Among them, Y ₀ is the transmit power of OFDM symbol 0, Y ₁ is the transmit power of OFDM symbol 1, Y ₂ is the transmit power of OFDM symbol 2, Y ₃ is the transmit power of OFDM symbol 3, and Y _t is the target transmit power; N ₁ is the number of resource element REs of the primary synchronization signal PSS corresponding to OFDM symbol 0, N ₂ is the number of REs of PBCH corresponding to OFDM symbol 1 or 3, N ₃ is the RE of PBCH corresponding to OFDM symbol 2 N ₂ -N ₃ is the number of REs of the secondary synchronization signal SSS corresponding to OFDM symbol 2; x is the preset transmit power of each RE, and x' is the number of REs of the PSS corresponding to OFDM symbol 0 The transmit power, x" is the transmit power of the RE of the SSS corresponding to OFDM symbol 2. 5. A network device, comprising: a transceiver and a processor, wherein, the processor, configured to determine the second transmit power of the remaining OFDM symbols in the SSB according to the first transmit power of the target OFDM symbol in the SSB; The processor is further configured to determine a target transmit power according to the first transmit power and the second transmit power; The transceiver is configured to transmit the SSB with the target transmit power. 6. The network device according to claim 5, wherein, The processor is further configured to determine the first transmit power of the target OFDM symbol in the SSB as the second transmit power of the remaining OFDM symbols in the SSB. 7. The network device according to claim 6, wherein, The target OFDM symbol is OFDM symbol 1 or OFDM symbol 3. 8. The network device according to claim 7, wherein, The processor is further configured to calculate the target transmit power by the following formula: Y ₀ =10lg(x′·N ₁ ); Y ₁ =10lg(x·N ₂ ); Y ₂ =10lg(x·N ₃ +x″·N ₁ ); Y ₃ =10lg(x·N ₂ ); Y _t =Y ₀ +Y ₁ +Y ₂ +Y ₃ ;

Among them, Y ₀ is the transmit power of OFDM symbol 0, Y ₁ is the transmit power of OFDM symbol 1, Y ₂ is the transmit power of OFDM symbol 2, Y ₃ is the transmit power of OFDM symbol 3, and Y _t is the target transmit power; N ₁ is the number of resource element REs of the primary synchronization signal PSS corresponding to OFDM symbol 0, N ₂ is the number of REs of PBCH corresponding to OFDM symbol 1 or 3, N ₃ is the RE of PBCH corresponding to OFDM symbol 2 N ₂ -N ₃ is the number of REs of the secondary synchronization signal SSS corresponding to OFDM symbol 2; x is the preset transmit power of each RE, and x' is the number of REs of the PSS corresponding to OFDM symbol 0 The transmit power, x" is the transmit power of the RE of the SSS corresponding to OFDM symbol 2. 9. A network device, characterized in that it comprises a processor, a memory, and a program stored on the memory and running on the processor, and the program is executed by the processor to achieve the performance as claimed in claim 1 Steps of the method for sending a synchronization signal block according to any one of to 4. 10. A computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the sending according to any one of claims 1 to 4 is realized Steps of a method of synchronizing a signal block.

Images