CN112448783B - Time delay compensation method for data transmission, terminal equipment and TRP - Google Patents

Time delay compensation method for data transmission, terminal equipment and TRP Download PDF

Info

Publication number
CN112448783B
CN112448783B CN201910818401.0A CN201910818401A CN112448783B CN 112448783 B CN112448783 B CN 112448783B CN 201910818401 A CN201910818401 A CN 201910818401A CN 112448783 B CN112448783 B CN 112448783B
Authority
CN
China
Prior art keywords
trp
delay
time delay
data
channel characteristic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201910818401.0A
Other languages
Chinese (zh)
Other versions
CN112448783A (en
Inventor
梁星魂
田未巍
袁航
高慧
胥恒
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to CN201910818401.0A priority Critical patent/CN112448783B/en
Priority to PCT/CN2020/110719 priority patent/WO2021036969A1/en
Publication of CN112448783A publication Critical patent/CN112448783A/en
Application granted granted Critical
Publication of CN112448783B publication Critical patent/CN112448783B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0682—Clock or time synchronisation in a network by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay

Abstract

The embodiment of the application discloses a time delay compensation method for data transmission, terminal equipment and TRP: the method comprises the steps that a plurality of TRPs providing services for UE determine first time delay between each TRP and the UE, obtain time delay difference between the first time delay and reference time delay, and carry out phase rotation compensation on first downlink data to be sent to the UE on a frequency domain according to the time delay difference of each TRP to obtain second downlink data, and the second downlink data are sent to the UE. Because the delay of the signal in the time domain is equivalent to the phase change of the signal in the frequency domain, the downlink data of each TRP is received by the UE at different times, but because the phase rotation compensation is performed on each downlink data in the frequency domain according to the corresponding delay difference, the UE can be equivalently understood as receiving the downlink data sent by each TRP at the same time in the frequency domain, so that the influence caused by the fact that the downlink data sent by each TRP reaches the same UE and is not synchronous in the time domain is eliminated, and the downlink data received by the UE cannot generate frequency selection in the frequency domain.

Description

Time delay compensation method for data transmission, terminal equipment and TRP
Technical Field
The present application relates to the field of communications technologies, and in particular, to a delay compensation method for data transmission, a terminal device, and a TRP.
Background
In a wireless communication system, a conventional cellular network (also referred to as a mobile network) divides a service area of a mobile phone into small regular hexagonal cells, and each Cell (Cell) is provided with a base station, so that a structure which is exactly like a 'Cell' is formed. Such a conventional cell-centric network cannot guarantee the spectrum efficiency and user experience at the cell edge. Based on this, a new network architecture and a wireless access method called "User Centric No Cell, UCNC (User Centric No Cell, UCNC) with a terminal device (UE) as a center" are created, in the UCNC, the User is used as the center, and the UE does not sense the Cell edge, so that the User can obtain Experience of high rate and low delay at any position of the network.
In the COMP technology, instead of a single Transmission and Reception node (TRP) serving a UE, a plurality of TRPs (e.g., two TRPs) serving the same UE together with the UE as a center, where the TRP corresponding to a serving cell where the UE is located is called a serving TRP, and the TRPs serving the UE in addition to the serving TRP are called cooperative TRPs. For example, when a user is at a cell edge, in order to improve the number of data streams or signal quality of the user, DL COMP is used when the TRP sends downlink data to the UE, that is, the serving TRP and the cooperative TRP respectively send downlink data to the UE, so as to improve the throughput rate of the UE at the cell edge.
However, when downlink data sent by two TRPs arrives at the same UE, if timing is performed with the downlink data that arrives at the UE first, then the downlink data that arrives later has a larger delay deviation (which may also be referred to as delay difference), and thus the downlink data with a larger delay generates a larger frequency selection on the frequency domain of the downlink data, thereby affecting the demodulation performance of the UE.
Disclosure of Invention
A first aspect of the embodiments of the present invention provides a method for compensating a delay in data transmission, including:
first, a first TRP determines an uplink delay between the first TRP and a UE communicating with the first TRP (the uplink delay may be referred to as a first delay), and since a UCNC technique is used for communication between the TRP and the UE, there are at least two TRPs serving the same UE, and the first TRP is any one of the at least two TRPs. After the first time delay is determined by the first TRP, a time delay difference between the first time delay and a reference time delay is further acquired, where the reference time delay is one of the at least two acquired uplink time delays between the at least two TRPs and the same UE with the shortest duration, and the at least two TRPs and the at least two time delays are in one-to-one correspondence respectively. Then, the first TRP performs phase rotation compensation on the first downlink data on a frequency domain according to the obtained time delay difference to obtain second downlink data; and after phase rotation compensation is carried out on the first downlink data on a frequency domain to obtain second downlink data, the second downlink data is sent to corresponding UE.
In the above embodiments of the present application, since the delay of a signal in the time domain is equivalent to the phase change of the signal in the frequency domain, although the downlink data sent by each of at least two TRPs to the UE is received by the UE at different times in time, the corresponding phase rotation compensation is performed on each downlink data in the frequency domain according to the corresponding delay difference, so that the UE can equivalently understand that the downlink data sent by each TRP is received by the UE at the same time in the frequency domain, thereby eliminating the influence of non-synchronization in the time domain when the downlink data sent by each TRP reaches the same UE, and finally making the channel estimation more accurate, so that the downlink data received by the UE from each TRP does not generate frequency selection in the frequency domain Equivalently, the same UE served by the base station can be reached at the same time, and the related time delay compensation method in the prior art which can only be applied to two TRPs at present is broken through.
With reference to the first aspect of the embodiment of the present application, in the first implementation manner of the first aspect of the embodiment of the present application, the frequency domain data of the second downlink data may be represented as X 2 (jw), the frequency domain data of the first downlink data may be represented as X 1 (jw), the delay difference can be expressed as Δ t, then X 2 (jw)、X 1 The relationship between (jw) and Δ t satisfies: x 2 (jw)＝e -jwΔt *X 1 (jw), where w ═ 2 π kf, f is the subcarrier spacing, and k is the subcarrier number.
In the above embodiments of the present application, expressions of the first downlink data and the second downlink data in the frequency domain are given, and a relationship that is satisfied among the first downlink data, the second downlink data, and the delay difference is further set forth.
With reference to the first aspect of the embodiment of the present application and the first implementation manner of the first aspect of the embodiment of the present application, in the second implementation manner of the first aspect of the embodiment of the present application, a specific manner of determining the first delay by the first TRP may be: first, a first TRP receives a measurement signal from a corresponding UE, and then the first TRP performs channel estimation according to the measurement signal, that is, measures a delay deviation of a first delay according to the measurement signal, thereby obtaining the first delay.
In the above embodiments of the present application, a specific implementation manner of determining the first delay by the first TRP is provided, which has flexibility.
With reference to the first aspect of the embodiment of the present application and the first implementation manner to the second implementation manner of the first aspect of the embodiment of the present application, in a third implementation manner of the first aspect of the embodiment of the present application, the implementation manner of the first TRP acquiring the delay difference between the first delay and the reference delay may be:
the first method is as follows: firstly, the first TRP sends a first time delay corresponding to the first TRP to a second TRP, wherein the second TRP is another one of the at least two TRPs; then, the first TRP receives a reference time delay from the second TRP, and the reference time delay is determined by the second TRP; and finally, the first TRP calculates the time delay difference between the first time delay and the reference time delay according to the first time delay and the reference time delay acquired from the second TRP.
The second method comprises the following steps: firstly, the first TRP sends a first time delay corresponding to the first TRP to a second TRP, wherein the second TRP is the other of the at least two TRPs; and then, after the second TRP determines the reference time delay, directly calculating the time delay difference by the second TRP according to the first time delay and the reference time delay, and sending the calculated time delay difference to the first TRP, namely, directly receiving the time delay difference between the first time delay and the reference time delay from the second TRP by the first TRP.
The third method comprises the following steps: firstly, a first TRP receives each uplink time delay (at least comprising one uplink time delay) corresponding to other TRPs (at least comprising one TRP) from other TRPs except the first TRP in the at least two TRPs, the first TRP determines a reference time delay according to each uplink time delay corresponding to other TRPs and the first time delay acquired by the first TRP, and finally, the first TRP calculates a time delay difference according to the determined reference time delay and the first time delay.
In the above embodiments of the present application, there may be various implementations of obtaining the delay difference between the first delay and the reference delay through the first TRP, and the details of the implementation are not limited herein. The three manners described above are merely schematic, and illustrate the diversity of the implementation manners for acquiring the delay difference between the first delay and the reference delay by the first TRP.
With Reference to the second implementation manner to the third implementation manner of the first aspect of the embodiment of the present application, in the fourth implementation manner of the first aspect of the embodiment of the present application, the measurement Signal received by the first TRP from the corresponding UE may be a channel Sounding Reference Signal (SRS).
In the above embodiments of the present application, a specific expression of the measurement signal is given, and the SRS is easy to acquire and has universality.
A second aspect of the embodiments of the present application further provides a method for compensating for a delay in data transmission, which specifically includes:
if the UE is in a cooperative area of at least two TRPs, the UE firstly determines a time delay difference according to a first time delay and a second time delay, wherein the first time delay is a time delay between the UE and the first TRP, the second time delay is a time delay difference between the same UE and the second TRP, the first time delay is smaller than the second time delay, and the first TRP and the second TRP are respectively two different TRPs of the at least two TRPs. In addition to calculating the delay difference according to the first delay and the second delay received from the first TRP and the second TRP, the UE may also receive the first downlink pilot from the first TRP and receive the second downlink pilot from the second TRP, where the delay of the first downlink pilot is the first delay and similarly the delay of the second downlink pilot is the second delay, because the first delay refers to a time length taken for data transmission between the first TRP and the UE and the first downlink pilot is data (belonging to one of the above-mentioned data transmissions) sent by the first TRP to the UE. After the UE obtains the delay difference between the first delay and the second delay, the UE performs corresponding phase rotation compensation on the second downlink pilot frequency in the frequency domain according to the delay difference to obtain a third downlink pilot frequency, and performs channel estimation on the first downlink pilot frequency and the third downlink pilot frequency respectively to obtain a first channel characteristic and a second channel characteristic, where the first channel characteristic is a channel characteristic between the first TRP and the UE, and the second channel characteristic is a channel characteristic between the second TRP and the UE. After obtaining the delay difference between the first delay and the second delay, and performing channel estimation on the first downlink pilot frequency and the third downlink pilot frequency respectively to obtain the first channel characteristic and the second channel characteristic, the UE may further perform phase rotation inverse compensation on the frequency domain on the second channel characteristic according to the delay difference to obtain the third channel characteristic. Finally, the UE may decode the traffic data (including the first traffic data sent by the first TRP and the second traffic data sent by the second TRP) according to the obtained first channel characteristic and the third channel characteristic.
In the above embodiment of the present application, the UE performs phase rotation compensation on a second downlink pilot sent by a time-extended TRP (i.e., a second TRP) in a frequency domain (performs phase rotation compensation using a delay difference between a first delay corresponding to the first TRP and a second delay corresponding to the second TRP) to obtain a third downlink pilot, and further performs channel estimation according to the third downlink pilot to obtain a second channel characteristic, so as to achieve a purpose of more accurate channel estimation; and finally, decoding the service data according to the first channel characteristic and the third channel characteristic in a combined manner, and matching the service data with the actual service data through phase rotation compensation.
In combination with the second aspect of the embodiments of the present applicationIn the first implementation manner of the second aspect of the embodiment of the present application, the frequency domain data of the third pilot may be represented as Y 2 (jw), the frequency domain data for the second pilot may be represented as Y 1 (jw), the delay difference can be expressed as Δ t, then Y 2 (jw)、Y 1 The relationship between (jw) and Δ t satisfies:
Y 2 (jw)＝e -jwΔt *Y 1 (jw), where w ═ 2 π kf, f is the subcarrier spacing, and k is the subcarrier number.
Similarly, the frequency domain data of the third channel characteristic may be represented as Z 2 (jw), the frequency domain data of the second channel characteristic may be represented as Z 1 (jw)，Z 1 (jw)、Z 2 The relationship between (jw) and Δ t satisfies:
Z 2 (jw)＝e jwΔt *Z 1 (jw), where w ═ 2 π kf, f is the subcarrier spacing, and k is the subcarrier number.
In the above embodiments of the present application, the expressions of the second downlink pilot and the third downlink pilot in the frequency domain and the expressions of the second channel characteristic and the third channel characteristic in the frequency domain are respectively given, and the relationship that is satisfied among the second downlink pilot, the third downlink pilot, and the delay difference and the relationship that is satisfied among the second channel characteristic, the third channel characteristic, and the delay difference are further explained, so that the influence caused by the delay difference during downlink data transmission between different TRPs is eliminated by this way.
With reference to the second aspect of the embodiment of the present application and the first implementation manner of the second aspect of the embodiment of the present application, in the second implementation manner of the second aspect of the embodiment of the present application, the UE may obtain the first time delay corresponding to the first TRP and the second time delay corresponding to the second TRP by: firstly, the UE receives a first timing signal from a first TRP and a second timing signal from a second TRP, respectively, the first timing signal and the second timing signal are transmitted by the first TRP and the second TRP at the same time, and the first timing signal and the second timing signal are staggered in the frequency domain, so that when the UE receives the first timing signal and the second timing signal, the UE can easily separate the two timing signals because the two timing signals are inconsistent in the frequency domain. The UE may determine the first delay and the second delay by receiving the first timing signal and the second timing signal.
In the above embodiments of the present application, a specific implementation manner of determining the first delay and the second delay by the first TRP is provided, and flexibility is provided.
With reference to the second implementation manner of the second aspect of the embodiment of the present application, in the third implementation manner of the second aspect of the embodiment of the present application, the timing signal (including the first timing signal and the second timing signal) may be a synchronous timing signal TRS, or may be another type of signal, and as long as the signal can achieve an effect of determining a time delay between the UE and the TRP, the signal may be referred to as a timing signal, and a specific form of the timing signal is not limited herein.
In the above embodiments of the present application, a specific expression of the timing signal is given, that is, the first TRS and the second TRS, which are easy to obtain and have universality.
A third aspect of the embodiments of the present application provides a TRP, where the TRP is a first TRP, and specifically includes:
a determining module, configured to determine a first time delay, where the first time delay is an uplink time delay between the first TRP and a terminal device UE, and the first TRP is one of at least two TRPs that together provide a service for the UE;
an obtaining module, configured to obtain a delay difference between the first delay and a reference delay, where the reference delay is one of at least two uplink delays obtained between the at least two TRPs and the UE and has a shortest duration, and the at least two TRPs correspond to the at least two uplink delays one to one;
the compensation module is used for performing phase rotation compensation on the first downlink data on a frequency domain according to the time delay difference to obtain second downlink data;
a sending module, configured to send the second downlink data to the UE.
With reference to the third aspect of the embodiments of the present application, in a first implementation of the third aspect of the embodiments of the present applicationIn this way, the frequency domain data of the second downlink data is represented as X 2 (jw), the frequency domain data of the first downlink data is represented as X 1 (jw), said time delay difference is Δ t, X 2 (jw)、X 1 The relationship between (jw) and Δ t satisfies: x 2 (jw)＝e -jwΔt *X 1 (jw)。
With reference to the third aspect of the embodiment of the present application and the first implementation manner of the third aspect of the embodiment of the present application, in a second implementation manner of the third aspect of the embodiment of the present application, the determining module is specifically configured to: receiving a measurement signal from the UE; and performing channel estimation according to the measurement signal to obtain the first time delay.
With reference to the third aspect of the embodiment of the present application and the first implementation manner to the second implementation manner of the third aspect of the embodiment of the present application, in a third implementation manner of the third aspect of the embodiment of the present application, the obtaining module is specifically configured to: transmitting the first latency to a second TRP, the second TRP being another of the at least two TRPs; and receiving the reference delay from the second TRP; finally, calculating the time delay difference according to the first time delay and the reference time delay;
or the like, or a combination thereof,
the acquisition module is specifically configured to: sending the first time delay to the second TRP, so that the second TRP calculates the time delay difference according to the first time delay and the reference time delay; and receiving the delay difference from the second TRP;
or the like, or, alternatively,
the acquisition module is specifically configured to: receiving at least one uplink delay from the other TRPs except the first TRP among the at least two TRPs; determining the reference time delay according to the at least one uplink time delay and the first time delay; and finally, calculating the time delay difference according to the first time delay and the reference time delay.
With reference to the third aspect of the embodiment of the present application and the first implementation manner to the third implementation manner of the third aspect of the embodiment of the present application, in a fourth implementation manner of the third aspect of the embodiment of the present application, the measurement signal includes: channel sounding reference signals, SRS.
A fourth aspect of the present embodiment provides a UE, which specifically includes:
a determining module, configured to determine a delay difference according to a first delay and a second delay, where the first delay is a delay between the UE and a first TRP, the second delay is a delay between the UE and a second TRP, and the first delay is smaller than the second delay;
a receiving module, configured to receive a first downlink pilot from the first TRP and a second downlink pilot from the second TRP, where a time delay of the first downlink pilot is the first time delay, and a time delay of the second downlink pilot is the second time delay;
the first compensation module is used for performing phase rotation compensation on the frequency domain on the second downlink pilot frequency according to the time delay difference to obtain a third downlink pilot frequency;
a channel estimation module, configured to perform channel estimation on the first downlink pilot and the third downlink pilot respectively to obtain a first channel characteristic and a second channel characteristic, where the first channel characteristic is a channel characteristic between the first TRP and the UE, and the second channel characteristic is a channel characteristic between the second TRP and the UE;
the second compensation module is used for performing phase rotation inverse compensation on the frequency domain on the second channel characteristic according to the time delay difference to obtain a third channel characteristic;
and the decoding module is used for decoding the service data according to the first channel characteristic and the third channel characteristic.
With reference to the fourth aspect of the embodiment of the present application, in a first implementation manner of the fourth aspect of the embodiment of the present application, the frequency domain data of the third pilot is represented as Y 2 (jw), the frequency domain data of the second pilot is represented as Y 1 (jw), said time delay difference is Δ t, Y 2 (jw)、Y 1 The relationship between (jw) and Δ t satisfies: y is 2 (jw)＝e -jwΔt *Y 1 (jw)；
The frequency domain data of the third channel characteristic is represented as Z 2 (jw), the second channelFrequency domain data representation of the feature is Z 1 (jw)，Z 1 (jw)、Z 2 The relationship between (jw) and Δ t satisfies: z is a linear or branched member 2 (jw)＝e jwΔt *Z 1 (jw)。
With reference to the fourth aspect of the embodiment of the present application and the first implementation manner of the fourth aspect of the embodiment of the present application, in the second implementation manner of the fourth aspect of the embodiment of the present application, before the determining module determines the delay difference according to the first delay and the second delay, the determining module is further configured to:
receiving a first timing signal from the first TRP and a second timing signal from the second TRP, respectively, the first timing signal and the second timing signal being transmitted simultaneously and staggered in a frequency domain;
determining the first time delay and the second time delay according to the first timing signal and the second timing signal.
With reference to the second implementation manner of the fourth aspect of the embodiment of the present application, in a third implementation manner of the fourth aspect of the embodiment of the present application, the first timing signal includes: a first synchronization timing signal TRS; the second timing signal includes: a second TRS.
The fifth aspect of the embodiments of the present application also provides a TRP as the first TRP, and the TRP may include: the system comprises a memory, a transceiver, a processor and a bus system, wherein the memory, the transceiver and the processor are connected through the bus system; wherein the memory is used for storing programs and instructions; the transceiver is used for receiving or sending information under the control of the processor; the processor is configured to call the instruction stored in the memory to execute the method in any implementable manner of the first aspect and the first aspect of the embodiment of the present application.
The sixth aspect of the present embodiment also provides a UE, where the UE may include: the system comprises a memory, a transceiver, a processor and a bus system, wherein the memory, the transceiver and the processor are connected through the bus system; wherein the memory is used for storing programs and instructions; the transceiver is used for receiving or sending information under the control of the processor; the processor is configured to call the instruction stored in the memory to execute the method in any of the realizable manners of the first aspect and the first aspect of the embodiment of the present application.
A seventh aspect of embodiments of the present application provides a communication apparatus, which may be a TRP or a chip in a TRP, and includes a processor configured to execute a computer program or instructions to cause the communication apparatus to perform the method in any one of the realizable manners of the first aspect and the first aspect.
Optionally, the communication device further comprises the memory. The processor is coupled to a memory for storing computer programs or instructions, and the processor is configured to execute the computer programs or instructions in the memory.
Optionally, the communication apparatus may further include a communication unit for communicating with other devices or other components in the communication apparatus. For example, the communication device is a TRP, and the communication unit is a transceiver. For example, the communication device is a chip in the TRP, and the communication unit is an input/output circuit or an interface of the chip.
An eighth aspect of embodiments of the present application provides a communication apparatus, which may be a UE or a chip in the UE, and the communication apparatus includes a processor configured to execute a computer program or instructions to cause the communication apparatus to perform the method in any implementable manner of the second aspect and the first aspect.
Optionally, the communication device further comprises the memory. The processor is coupled to a memory for storing computer programs or instructions, and the processor is configured to execute the computer programs or instructions in the memory.
Optionally, the communication apparatus may further include a communication unit for communicating with other devices or other components in the communication apparatus. For example, the communication device is a UE and the communication unit is a transceiver. For example, the communication device is a chip in the UE, and the communication unit is an input/output circuit or an interface of the chip.
A ninth aspect of embodiments of the present application provides a chip comprising a processor and interface circuitry, the interface circuitry being coupled to the processor, the processor being configured to execute a computer program or instructions to implement a method according to any of the first and second aspects, the interface circuitry being configured to communicate with other modules outside the chip.
A tenth aspect of embodiments of the present application provides a computer-readable storage medium, where instructions are stored, and when the instructions are executed on a computer, the computer may perform the method of any one of the foregoing first aspect and the foregoing first possible implementation manner, or the method of any one of the foregoing second aspect and the foregoing second possible implementation manner.
An eleventh aspect of embodiments of the present application provides a computer program product containing instructions, which when run on a computer, enables the computer to perform the method according to any one of the first aspect and the first possible implementation manner, or the method according to any one of the second aspect and the second possible implementation manner.
According to the technical scheme, the embodiment of the application has the following advantages: firstly, a UE sends a measurement signal to a plurality of TRPs (the plurality of TRPs are TRPs that together provide a service to the UE, the plurality of TRPs includes at least two TRPs), each TRP (which may be referred to as a first TRP) in the plurality of TRPs may obtain a time delay (which may be referred to as a first time delay) from the measurement signal to the TRP according to an obtained time point of the measurement signal, and may further obtain a time delay difference between the first time delay and a reference time delay (a time delay with a shortest time length among the plurality of time delays obtained by the plurality of TRPs is referred to as a reference time delay), and finally, each TRP may perform phase rotation compensation on first downlink data to be sent to the UE on a frequency domain according to the obtained time delay difference to obtain updated second downlink data, and send the obtained second downlink data to the UE, since a delay of a signal on the time domain is equivalent to a phase change of the signal on the frequency domain, therefore, although the downlink data sent by each TRP of the plurality of TRPs to the UE is received by the UE at different times in time, because each downlink data is correspondingly phase rotation compensated in the frequency domain according to the corresponding delay difference, the UE can be equivalently understood in the frequency domain as receiving the downlink data sent by each TRP at the same time, so that the influence caused by the fact that the downlink data sent by each TRP reaches the same UE asynchronously in the time domain is eliminated, and finally the channel estimation is more accurate, so that the downlink data received by the UE from each TRP does not generate frequency selection in the frequency domain, and the delay compensation method described in the embodiment of the present application has no limitation on the number of TRPs, and the downlink data delivered together by a plurality of TRPs (i.e. at least two TRPs) providing services for the UE can be equivalent to reach the same UE provided with the services at the same time in the frequency domain, the related time delay compensation method in the prior art which can only be applied to two TRPs at present is broken through.
Drawings
Fig. 1 is a schematic diagram of a network architecture of UCNC technology in an embodiment of the present application;
fig. 2 is a schematic diagram of a process of transmitting downlink data to a UE by using a joint transmission manner for a serving TRP and a cooperative TRP;
fig. 3 is a schematic diagram of a delay compensation method for data transmission according to an embodiment of the present application;
FIG. 4 is a diagram illustrating an implementation of data transmission in an embodiment of the present application;
fig. 5 is another schematic diagram of a delay compensation method for data transmission in an embodiment of the present application;
fig. 6 is a schematic diagram of an implementation manner of UE-side data transmission according to an embodiment of the present application;
FIG. 7 is a schematic diagram of a first TRP in an embodiment of the present application;
FIG. 8 is a diagram of a UE according to an embodiment of the present application;
fig. 9 is a diagram of a first TRP (taking a base station as an example) according to an embodiment of the present application;
fig. 10 is another schematic diagram of a UE according to an embodiment of the present application.
Detailed Description
By adopting the COMP technology, the UCNC enables a plurality of TRPs to provide service for the same UE together by taking the UE as the center instead of a single TRP to provide service for the UE, so that the use experience of the UE is better. Fig. 1 is a schematic diagram of a network architecture of UCNC technology in an embodiment of the present invention, and as can be seen from fig. 1, when a UE is located at position a shown in fig. 1, TRP1, TRP2, TRP3, TRP4 provide network services for the UE; when the UE moves to the position B shown in fig. 1, network services are provided for the UE by TRP4, TRP5, TRP 6; when the UE moves to the position C shown in fig. 1, network services are provided to the UE again by the TRP6 and TRP 7. Therefore, data transmission can be carried out between the network resources of a plurality of TRPs and the same UE, so that the probability of the edge of a traditional cellular network cell is weakened, each TRP can provide better network management and configuration for the UE, and the user experience is improved. It should be noted that the TRP in the embodiment of the present application may be a base station, for example, a 2G, 3G, 4G base station, or a 5G base station, and the TRP is not limited herein.
If a plurality of TRPs serve the same UE, that is, the UE is in the cell intersection range of the plurality of TRPs, the two TRPs in fig. 2 are taken as an example for explanation: when the UE is in the cell coverage area of the serving TRP and the cell coverage area of the cooperative TRP at the same time (the areas covered by both the cells may be referred to as cooperative areas), the TRP may initiate a joint transmission mode when transmitting downlink data to the UE in order to improve the number of data streams or signal quality of the UE. The specific process can be as follows: the UE first sends an uplink signal to each TRP, and after each TRP receives the uplink signal, it can know in which cooperative regions of the TRPs the UE is located (for example, the serving TRP and the cooperative TRP in fig. 2), and after the serving TRP and the cooperative TRP in fig. 2 determine that the UE is located in the cooperative regions of the serving TRP and the cooperative TRP, when sending downlink data to the UE, data is transmitted to the UE in a DL CoMP manner, so as to improve the throughput rate of the UE in the cooperative regions. Before transmitting downlink Data to the UE, two TRPs (i.e. a service TRP and a cooperation TRP) transmit a synchronization timing signal to the UE, the synchronization timing signal is a broadcast signal and is transmitted by the service TRP and the cooperation TRP simultaneously, the UE acquires two synchronization timing signals respectively transmitted by the service TRP and the cooperation TRP sequentially, and the UE performs timing according to the synchronization timing signal acquired first, so that when the service TRP and the cooperation TRP transmit downlink Data to the UE simultaneously (in fig. 2, the downlink Data transmitted by the service TRP may be referred to as Data1, and the downlink Data transmitted by the cooperation cell may be referred to as Data2), due to the different distances between the service TRP, the cooperation TRP and the UE, the downlink delays to the UE after the Data1 and the Data2 are transmitted simultaneously are different (assuming that the delay of the Data1 is smaller than that of the Data2, the difference between the Data1 and the Data is Δ t0), because the UE has timed with the synchronization timing signal acquired first, then, the UE acquires Data1 first, acquires Data2 after the interval Δ t0, and then performs multipath delay spread processing on the acquired Data2, that is, resists the existing delay difference through an adaptive wiener filtering algorithm, so as to eliminate the influence of the delay difference caused by the fact that Data1 and Data2 cannot reach the UE synchronously as much as possible, because the downlink Data cannot reach the UE synchronously, and therefore, when the UE estimates the channels of the two downlink Data, the UE cannot match the channels of the two downlink Data, thereby affecting channel equalization, and finally affecting the demodulation performance of the UE, regardless of whether the downlink Data (i.e., Data1) received by the UE first or the downlink Data (i.e., Data2) received later.
In order to solve the problem that downlink data acquired by the UE cannot be synchronized due to the delay difference, an embodiment of the present application provides a delay compensation method for data transmission, where the delay compensation method may be implemented from a TRP side or a UE side, and is not limited herein. The following describes a method for compensating for delay in data transmission in the embodiment of the present application from the TRP side and the UE side, respectively:
firstly, a time delay compensation method of data transmission is applied to TRP.
Referring to fig. 3, a specific implementation manner of a delay compensation method for data transmission in the embodiment of the present application is as follows:
301. the first TRP determines a first time delay.
First, a first TRP determines an uplink delay between the first TRP and a UE communicating with the first TRP (the uplink delay may be referred to as a first delay), and since a UCNC technique is used for communication between the TRP and the UE, there are at least two TRPs serving the same UE, and the first TRP is any one of the at least two TRPs.
It should be noted that, in some embodiments of the present application, a specific way for the first TRP to determine the first time delay may be: first, a first TRP receives a measurement signal from a corresponding UE, and then the first TRP performs channel estimation according to the measurement signal, that is, measures a delay deviation of a first delay according to the measurement signal, thereby obtaining the first delay. It should be further noted that the function of the measurement signal is to enable the first TRP to perform channel estimation by using the measurement signal so as to calculate an uplink time delay (i.e., a first time delay) between the first TRP and the corresponding UE, and the form of the measurement signal may be various, for example, the measurement signal may be an SRS or other forms of signals, and the form of the measurement signal is not limited herein.
302. The first TRP acquires a delay difference between the first delay and the reference delay.
After the first time delay is determined by the first TRP, a time delay difference between the first time delay and a reference time delay is further acquired, where the reference time delay is one of the at least two acquired uplink time delays between the at least two TRPs and the same UE with the shortest duration, and the at least two TRPs and the at least two time delays are in one-to-one correspondence respectively.
For ease of understanding, fig. 4 is used as an example for illustration: assuming that the UE is in the cooperation area of 4 TRPs (respectively denoted as TPR11, TRP12, TRP13, TRP14) at a certain time, the above-mentioned at least two TRPs are 4, the 4 TRPs can determine uplink time delays between the UE and each TRP in a manner similar to that in step 301, and the uplink time delays determined by each TRP can be respectively denoted as T1, T2, T3, and T4, that is, the time delay corresponding to the TRP11 is T1, the time delay corresponding to the TRP12 is T2, the time delay corresponding to the TRP13 is T3, and the time delay corresponding to the TRP14 is T4. And assuming that it has been predetermined that the magnitude relationship between the respective delays satisfies the relationship: t4 > T3 > T1 > T2, and since the reference delay is the shortest one of the uplink delays corresponding to the 4 TRPs, T2 of T1 to T4 can be determined as the reference delay. When the uplink delays between the TRPs and the UE are determined, at this time, any one of the 4 TRPs may be designated as the first TRP (assuming that TRP11 is the first TRP), the TRP11 may obtain the delay difference between the first delay T1 and the reference delay T2 (the delay difference may be denoted as Δ T12), that is, the delay difference between the first delay T1 and the reference delay T2 obtained by the TRP11 is: Δ T12 ═ T1-T2. Similarly, if TRP12, TRP13, or TRP14 among the 4 TRPs is designated as the first TRP, the delay differences Δ T22, Δ T32, and Δ T42 between T2, T3, or T4 and the reference delay T2 can be obtained in the same manner as TRP11, that is, Δ T22 — T2-T2, Δ T32 — T3-T2, and Δ T42 — T4-T2, respectively.
It should be noted that, in some embodiments of the present application, if the first delay of the first TRP of the designated at least two TRPs is exactly the reference delay, and if the Δ T22 is T2-T2, the obtained delay difference is zero, in this case, if the delay difference obtained by the first TRP (such as the TRP22 described above) is zero, the first TRP determines that the first TRP is the reference TRP (such as the TRP22 is determined to be the reference TRP), at this time, the reference TRP may directly transmit corresponding downlink Data (may also be referred to as reference downlink Data) to the UE, for example, in fig. 2, the downlink Data transmitted to the UE by the TRP22 is Data12, and the Data12 is the reference downlink Data.
It should be noted that, in some embodiments of the present application, the delay difference between the first TRP acquisition first delay and the reference delay may be implemented in various ways, and is not limited herein. Several specific implementations of the first TRP acquiring the delay difference between the first delay and the reference delay are exemplarily described below:
A. the first TRP receives a reference delay from the second TRP and calculates a delay difference based on the first delay and the reference delay.
Firstly, the first TRP sends a first time delay corresponding to the first TRP to a second TRP, wherein the second TRP is another one of the at least two TRPs; then, the first TRP receives a reference time delay from the second TRP, and the reference time delay is determined by the second TRP; and finally, the first TRP calculates the time delay difference between the first time delay and the reference time delay according to the first time delay and the reference time delay acquired from the second TRP.
For ease of understanding, fig. 4 is still used as an example for illustration: since the 4 TRPs in fig. 4 each determine the uplink delay (i.e., T1 to T4) between each TRP and the same UE, after each TRP determines the uplink delay corresponding to each TRP, the determined uplink delay is sent to any one of the other 3 TRPs except TRP11 (assuming that TRP11 is the first TRP), for example, one of the other 3 TRPs may be determined as the second TRP according to a preset manner, or one of the other 3 TRPs may be determined as the second TRP according to a randomly specified manner, and the determination manner of the second TRP is not limited herein as long as the first TRP and the second TRP are not the same TRP. Assuming that the TRP13 in fig. 4 is determined to be the second TRP, after the TRP11, TRP12 and TRP14 respectively acquire the corresponding time delays T1, T2 and T4, the TRP11 respectively sends T1, T2 and T4 to the TRP13, and the TRP13 determines which time duration of T1, T2 and T3(T3 is determined by the TRP 13) or T4 is the shortest. As described above, assuming that the TRP13 determines that the duration of the T2 is the shortest, the TRP13 may further determine that the T2 is the reference delay, and send the reference delay T2 to the TRP11, and after the TRP11 acquires the reference delay T2, the TRP 8552 may calculate the delay difference Δ T12 according to the first delay T1 acquired by itself and the reference delay T2 received from the TRP13, where Δ T12 is T1-T2. Similarly, if the first TRP is TRP12, TRP13 or TRP14, the time delay difference Δ t22, Δ t32 or Δ t42 is also calculated in a similar manner, which is not described herein again.
B. The first TRP directly receives the time delay difference from the second TRP, the time delay difference is calculated by the second TRP according to the first time delay and the reference time delay, and the first time delay is sent to the second TRP by the first TRP.
Firstly, the first TRP sends a first time delay corresponding to the first TRP to a second TRP, wherein the second TRP is the other of the at least two TRPs; and then, after the second TRP determines the reference time delay, directly calculating the time delay difference by the second TRP according to the first time delay and the reference time delay, and sending the calculated time delay difference to the first TRP, namely, directly receiving the time delay difference between the first time delay and the reference time delay from the second TRP by the first TRP.
Here, the following description is made by taking fig. 4 as an example: after determining the uplink time delay (i.e., T1 to T4) corresponding to each TRP in the 4 TRPs in fig. 4, sending the determined uplink time delay to any one of the other 3 TRPs except for TRP11 (assuming that TRP11 is the first TRP), for example, one of the other 3 TRPs may be determined as the second TRP according to a preset manner, or one of the other 3 TRPs may be determined as the second TRP according to a randomly specified manner, where the determining manner of the second TRP is not limited, as long as the first TRP and the second TRP are not the same TRP. Still assuming that it is determined that TRP13 in fig. 4 is the second TRP, TRP11, TRP12, and TRP14 respectively obtain corresponding time delays T1, T2, and T4, respectively, and then respectively send T1, T2, and T4 to TRP13, and TRP13 determines which one of T1, T2, and T3(T3 is determined by TRP 13) and T4 has the shortest time duration. As described above, assuming that the TRP13 determines that the duration of T2 is the shortest, the TRP13 may determine that T2 is the reference delay, and further calculate the delay difference Δ T12 according to the T1 received from the first TRP and the determined reference delay T2, where Δ T12 is T1-T2, and finally, the TRP13 may send the calculated delay difference Δ T12 to the TRP 11. That is, the TRP11 only needs to send the first time delay T1 acquired by itself to the TRP13, and receives the time delay difference Δ T12 calculated by the TRP13 according to the first time delay T1 and the reference time delay T2 from the TRP 13. Similarly, if the first TRP is TRP12, TRP13, TRP14, the delay difference Δ t22, Δ t32 or Δ t42 is also calculated in a similar manner, which is not described herein in detail.
C. And the first TRP receives the uplink time delay of other TRPs except the first TRP in the at least two TRPs, and determines the reference time delay, thereby calculating the time delay difference between the reference time delay and the first time delay.
Firstly, a first TRP receives each uplink time delay (at least comprising one uplink time delay) corresponding to other TRPs (at least comprising one TRP) from other TRPs except the first TRP in the at least two TRPs, the first TRP determines a reference time delay according to each uplink time delay corresponding to other TRPs and the first time delay acquired by the first TRP, and finally, the first TRP calculates a time delay difference according to the determined reference time delay and the first time delay.
Similarly, for ease of understanding, fig. 4 is still used as an example for illustration: after each TRP in the 4 TRPs in fig. 4 determines the corresponding uplink time delay (i.e., T1 to T4), except for TRP11 (assuming that TRP11 is the first TRP), the other 3 TRPs (i.e., TRP12, TRP13, TRP14) respectively send the determined uplink time delays (i.e., T2, T3, T4) to TRP11, so that after TRP11 receives T2, T3, T4 sent by each TRP, it can be determined which time duration of T1(T1 is determined by TRP11 itself), T2, T3, T4 is the shortest. As described above, assuming that the TRP11 determines that the duration of T2 is the shortest, the TRP11 may determine that T2 is the reference delay, and further calculate the delay difference Δ T12 according to the first delay T1 and the determined reference delay T2, where Δ T12 is T1-T2. That is, the TRP11, in addition to acquiring its own first time delay T1, receives 3 uplink time delays T2, T3, and T4 corresponding to the other 3 TRPs from the other 3 TRPs, determines the reference time delay T2 based on the received 3 uplink time delays, and finally calculates the time delay difference Δ T12 according to the first time delay T1 and the reference time delay T2. Similarly, if the first TRP is TRP12, TRP13 or TRP14, the time delay difference Δ t22, Δ t32 or Δ t42 is also calculated in a similar manner, which is not described herein again.
D. The first TRP acquires a time delay difference between the first time delay and the reference time delay through participation of the UE.
It should be further noted that, in addition to the foregoing implementation, the first TRP may acquire the delay difference between the first delay and the reference delay, and may acquire the delay difference between the first delay and the reference delay through participation of the UE.
For example, still using fig. 4 as an example: after the uplink delays T1, T2, T3, and T4 are respectively determined by each TRP, each TRP sends the corresponding uplink delay to the UE, and after the UE acquires T1, T2, T3, and T4, the UE may continue any one of the following operations: 1) the UE determines which one of T1, T2, T3 and T4 is the shortest in time length, determines the uplink time delay with the shortest time length as a reference time delay (assuming that the UE determines T2 as the reference time delay), then sends the reference time delay T2 to TRP11, and calculates a time delay difference delta T12 according to the first time delay T1 and the reference time delay T2 by using the TRP11, wherein the delta T12 is T1-T2. 2) The UE sends the received T1, T2, T3, and T4 to the TRP11, determines which one of the T1, T2, T3, and T4 is the shortest time length by the TRP11, determines that the uplink time delay with the shortest time length is the reference time delay (assuming that the UE determines that T2 is the reference time delay), and then calculates the time delay difference Δ T12 by the TRP11 according to the first time delay T1 and the reference time delay T2, where Δ T12 is T1-T2. 3) The UE determines which one of T1, T2, T3 and T4 is the shortest time length, determines that the uplink time delay with the shortest time length is the reference time delay (assuming that the UE determines that T2 is the reference time delay), then calculates a time delay difference delta T12 according to the first time delay T1 and the reference time delay T2, and directly sends the time delay difference delta T12 to the TRP11, wherein the delta T12 is T1-T2. It should be noted that, in addition to the above operations, the specific manner how the first TRP and the UE cooperate to determine the delay difference between the first delay and the reference delay may also have more implementation manners, and is not limited herein.
303. And the first TRP performs phase rotation compensation on the first downlink data on a frequency domain according to the time delay difference to obtain second downlink data.
Since the delay of a signal in the time domain is equivalent to the corresponding change in the phase of the signal in the frequency domain, for example, assuming that X (t) represents a time domain signal, X (jw) represents a frequency domain signal corresponding to the time domain signal, and Δ t 'represents a time delay difference, then X (t + Δ t') and X (jw) × e jwΔt′ The representation of the same signal in the time and frequency domain, respectively. Therefore, after the first TRP acquires the delay difference between the first delay and the reference delay, the first downlink data to be sent to the UE is subjected to phase rotation compensation in the frequency domain according to the delay difference, so as to obtain the second downlink data. In some embodiments of the present application, specifically, the first TRP may convert the first downlink data from a time-domain expression to a frequency-domain expression, and convert the second downlink data from a time-domain expression to a frequency-domain expression, so as to obtain a frequency-domain data expression X of the first downlink data 1 (jw) and frequency domain data expression X of second downlink data 2 (jw), if the delay difference between the first delay and the reference delay is represented as Δ t, then Δ t, X 2 (jw)、X 1 Between (jw) and Δ tThe relationship satisfies: x 2 (jw)＝e -jwΔt *X 1 (jw), where w ═ 2 π kf, f is the subcarrier spacing, and k is the subcarrier number. By the method, the time delay difference is converted into the phase difference of the corresponding downlink data on the frequency domain, and the corresponding phase rotation compensation is carried out on the phase difference, so that the influence caused by the time delay difference during the transmission of the downlink data among different TRPs is eliminated.
304. The first TRP sends second downlink data to the UE.
And after the first TRP performs phase rotation compensation on the first downlink data on a frequency domain according to the time delay difference to obtain second downlink data, the second downlink data is sent to the corresponding UE.
Since each of the at least two TRPs is served as the first TRP to perform the delay compensation method for data transmission as described in the embodiment corresponding to fig. 3, although the downlink data sent by each of the at least two TRPs to the UE is received by the UE at different times, since the corresponding phase rotation compensation is performed on each downlink data in the frequency domain according to the corresponding delay difference, it can be equivalently understood that the UE receives the downlink data sent by each TRP at the same time in the frequency domain, so that the influence caused by the fact that the downlink data sent by each TRP arrives at the same UE asynchronously in the time domain is eliminated.
In this embodiment, first, the UE transmits a measurement signal to a plurality of TRPs (the plurality of TRPs are TRPs that together provide a service to the UE, the plurality of TRPs includes at least two TRPs), each TRP (which may be referred to as a first TRP) in the plurality of TRPs may obtain a time delay (which may be referred to as a first time delay) of the measurement signal reaching the TRP according to a time point of the obtained measurement signal, and may further obtain a time delay difference between the first time delay and a reference time delay (one of the plurality of time delays obtained by the plurality of TRPs with the shortest time duration is referred to as a reference time delay), and finally, each TRP may perform phase rotation compensation on first downlink data to be transmitted to the UE on a frequency domain according to the obtained time delay difference to obtain updated second downlink data, and transmit the obtained second downlink data to the UE, since a time domain delay of a signal on the upper TRP is equivalent to a phase change of the signal on the frequency domain, therefore, although the downlink data sent by each TRP of the plurality of TRPs to the UE is received by the UE at different times in time, because each downlink data is correspondingly phase rotation compensated in the frequency domain according to the corresponding delay difference, the UE can be equivalently understood in the frequency domain as receiving the downlink data sent by each TRP at the same time, so that the influence caused by the fact that the downlink data sent by each TRP reaches the same UE asynchronously in the time domain is eliminated, and finally the channel estimation is more accurate, so that the downlink data received by the UE from each TRP does not generate frequency selection in the frequency domain, and the delay compensation method described in the embodiment of the present application has no limitation on the number of TRPs, and the downlink data delivered together by a plurality of TRPs (i.e. at least two TRPs) providing services for the UE can be equivalent to reach the same UE provided with the services at the same time in the frequency domain, the related time delay compensation method in the prior art which can only be applied to two TRPs at present is broken through.
And secondly, the time delay compensation method of data transmission is applied to the UE.
Referring to fig. 5, a specific implementation manner of a delay compensation method for data transmission in the embodiment of the present application is as follows:
501. and the UE determines a time delay difference according to the first time delay and the second time delay.
If the UE is in the cooperative area of the at least two TRPs, the UE firstly determines a time delay difference according to a first time delay and a second time delay, wherein the first time delay is a time delay between the UE and the first TRP, the second time delay is a time delay difference between the same UE and the second TRP, the first time delay is smaller than the second time delay, and the first TRP and the second TRP are respectively two different TRPs in the at least two TRPs. It should be noted that, in some embodiments of the present application, the UE may obtain the first time delay corresponding to the first TRP and the second time delay corresponding to the second TRP by, but not limited to, the following manners: firstly, the UE receives a first timing signal from a first TRP and a second timing signal from a second TRP, respectively, the first timing signal and the second timing signal are transmitted by the first TRP and the second TRP at the same time, and the first timing signal and the second timing signal are staggered in the frequency domain, so that when the UE receives the first timing signal and the second timing signal, the UE can easily separate the two timing signals because the two timing signals are not consistent in the frequency domain. The UE can determine the first delay and the second delay by the received first timing signal and the second timing signal through the existing technical means. It should be further noted that, in some embodiments of the present application, the timing signal (including the first timing signal and the second timing signal) may be a synchronous timing signal TRS, or may be another type of signal, and as long as the signal can perform an effect of determining a time delay between the UE and the TRP, the signal may be referred to as a timing signal, and a specific form of the timing signal is not limited herein.
For ease of understanding, fig. 2 is taken as an example for illustration: fig. 2 illustrates that the UE is in the cooperation area of two TRPs (respectively, the service TRP and the cooperation TRP), first, the service TRP and the cooperation TRP respectively transmit a timing signal to the UE, and one timing signal corresponds to one TRP, so there are 2 timing signals in total, and it is assumed that the two timing signals are respectively referred to as Xa and Xb, the two timing signals are respectively transmitted by the service TRP and the cooperation TRP at the same time, and Xa and Xb are staggered in the frequency domain; and then, the UE respectively determines the time delay between the service TRP and the UE (the time delay is supposed to be Ta) and the time delay between the cooperation TRP and the UE (the time delay is supposed to be Tb) according to the received Xa and Xb, the UE compares the two time delays Ta and Tb after acquiring the two time delays, and if Tb-Ta is greater than 0, the UE determines that the service TRP is a first TRP and the cooperation TRP is a second TRP, and further determines that Ta is the first time delay and Tb is the second time delay.
502. The UE receives a first downlink pilot from the first TRP and a second downlink pilot from the second TRP.
The UE may receive a first downlink pilot from the first TRP and a second downlink pilot from the second TRP in addition to calculating a delay difference according to the first delay and the second delay received from the first TRP and the second TRP. Since the first delay refers to a time length taken for data transmission between the first TRP and the UE, and the first downlink pilot is data (belonging to one of the above-mentioned data transmissions) sent by the first TRP to the UE, the delay of the first downlink pilot is the first delay, and similarly, the delay of the second downlink pilot is the second delay.
It should be noted that, the first TRP may send, in addition to the first timing synchronization signal and the first downlink pilot, traffic data (may be referred to as first traffic data) to the UE, where the first traffic data is data that is needed when the first TRP performs traffic with the UE.
In some embodiments of the present application, the first TRP may send a data packet (may be referred to as a first data packet) to the UE, where the first data packet includes the first timing synchronization signal, the first downlink pilot, and the first traffic data; the first TRP may also send the first timing synchronization signal to the UE, so that after the UE determines the first time delay according to the first timing synchronization signal, the first TRP sends the second data packet to the UE, where the second data packet includes the first downlink pilot and the first service data, and specifically, the manner how the first TRP sends the first timing synchronization signal, the first downlink pilot, and the first service data is not limited herein. Similarly, a data transmission manner similar to the first TRP may be adopted for the second TRP, that is, the second TRP may transmit, to the UE, in addition to the second timing synchronization signal and the second downlink pilot, traffic data (may be referred to as second traffic data) that is data required when the second TRP performs traffic with the UE, and in some embodiments of the present application, the second TRP may transmit, to the UE, a data packet (may be referred to as a third data packet) that includes the second timing synchronization signal, the second downlink pilot, and the second traffic data; the second TRP may also send the second timing synchronization signal to the UE first, so that after the UE determines the second time delay according to the second timing synchronization signal first, the second TRP sends a fourth data packet to the UE, where the fourth data packet includes the second downlink pilot and the second service data, and specifically, a manner how the second TRP sends the second timing synchronization signal, the second downlink pilot, and the second service data is not limited herein.
It should be noted that although the first TRP and the second TRP transmit the first data packet (or the second data packet) and the third data packet (or the fourth data packet) to the same UE respectively at the same time, the UE does not receive the first data packet (or the second data packet) and the third data packet (or the fourth data packet) at the same time due to the delay difference. For ease of understanding, see FIG. 6 in particular: taking the UE receiving the first data packet and the third data packet as an example, although the UE receives the first data packet and the third data packet at different times, since the delay difference between the two TRPs is not very large, after receiving the first data packet and the third data packet, the UE side cannot distinguish which is the first data packet and which is the third data packet, and only senses that one data packet (as shown in fig. 6, it may be called a target data packet) is received, the target data packet includes the first data packet sent by the first TRP and the third data packet sent by the second TRP, after receiving the target data packet, the UE performs front-end processing, that is, performs Cyclic Prefix (CP) and Fast Fourier Transform (FFT) to transform the time domain data of the target data packet into the frequency domain data of the target data packet, and then, the UE separates the channels and extracts and separates the first timing signal, the second timing signal, the first downlink pilot frequency and the second downlink pilot frequency from the target data packet respectively. Wherein, the effect of first timing signal has two: 1) measuring a first time delay between the first TRP and the UE; 2) the first time delay expansion is measured, and the measured first time delay expansion is used to determine channel interpolation (which may be referred to as first channel interpolation), for example, the first channel interpolation may be a value of a wiener filter coefficient, and may also be referred to as first wiener filter interpolation. The first downlink pilot is used for channel estimation to obtain a first channel characteristic. It should be noted that the first channel characteristics include channel characteristics of the first downlink pilot and channel characteristics of the first traffic data. In this embodiment of the present application, a specific process of the UE performing channel estimation according to the first downlink pilot frequency to obtain the first channel characteristic may be: first, the UE determines the channel characteristics of the first downlink pilot, and then interpolates the channel characteristics of the first downlink pilot by using first channel interpolation (the first channel interpolation is obtained by first delay spread measurement performed by the UE according to the first timing signal), so as to obtain the channel characteristics of the first service data, so as to determine the first channel characteristics, where the first channel characteristics include the channel characteristics of the first downlink pilot and the channel characteristics of the first service data. Similarly, the second timing signal also has a similar role, i.e. the role of the second timing signal is also two: 1) measuring a second time delay between the second TRP and the UE; 2) and measuring the second delay spread, wherein the measured second delay spread is used for determining channel interpolation (which may be called second channel interpolation), for example, the second channel interpolation may be a value of a wiener filter coefficient, and may also be called second wiener filter interpolation. The second downlink pilot is used for channel estimation to obtain a second channel characteristic. It should be noted that the second channel characteristics include channel characteristics of the second downlink pilot and channel characteristics of the second traffic data. In this embodiment of the present application, a specific process of the UE performing channel estimation according to the second downlink pilot frequency to obtain the second channel characteristic may be: first, the UE determines the channel characteristics of the second downlink pilot, and then interpolates the channel characteristics of the second downlink pilot by using second channel interpolation (the second channel interpolation is obtained by second delay spread measurement performed by the UE according to the second timing signal), so as to obtain the channel characteristics of the second service data, so as to determine the second channel characteristics, where the second channel characteristics include the channel characteristics of the second downlink pilot and the channel characteristics of the second service data.
It should be further noted that, in some embodiments of the present application, step 501 may be performed first and then step 502 is performed, step 502 may be performed first and then step 501 is performed, and steps 501 and 502 may also be performed simultaneously, where a sequence between step 501 and step 502 is not limited specifically here.
503. And the UE performs phase rotation compensation on the frequency domain on the second downlink pilot frequency according to the time delay difference to obtain a third downlink pilot frequency.
Since the delay of a signal in the time domain is equivalent to a corresponding change in the phase of the signal in the frequency domain, for example, suppose that X (t) represents a time domain signal and X (jw) represents a signal corresponding to the time domain signalFrequency domain signal, Δ t 'represents the delay difference, then X (t + Δ t') and X (jw) xe jwΔt′ The representation of the same signal in the time and frequency domain, respectively. Therefore, after obtaining the delay difference between the first delay and the second delay, the UE performs corresponding phase rotation compensation on the second downlink pilot frequency in the frequency domain according to the delay difference, so as to obtain a third downlink pilot frequency (as shown in fig. 6). In some embodiments of the present application, specifically, the first TRP may convert the second downlink pilot from an expression mode in a time domain to an expression mode in a frequency domain, and convert the third downlink pilot from an expression mode in the time domain to an expression mode in the frequency domain, so as to obtain a frequency domain data expression Y of the second downlink pilot 1 (jw) and frequency domain data expression Y of third downlink pilot 2 (jw), if the delay difference between the first delay and the second delay is represented as Δ t, then Δ t, Y 2 (jw)、Y 1 The relationship between (jw) and Δ t satisfies: y is 2 (jw)＝e -jwΔt *Y 1 (jw), where w ═ 2 π kf, f is the subcarrier spacing, and k is the subcarrier number.
504. And the UE carries out channel estimation on the first downlink pilot frequency and the third downlink pilot frequency respectively to obtain a first channel characteristic and a second channel characteristic.
After the UE performs phase rotation compensation on the frequency domain on the second downlink pilot according to the time delay difference to obtain a third downlink pilot, channel estimation is performed on the first downlink pilot and the third downlink pilot respectively to obtain a first channel characteristic and a second channel characteristic (as shown in fig. 6), where the first channel characteristic is a channel characteristic between the first TRP and the UE, and the second channel characteristic is a channel characteristic between the second TRP and the UE. It should be noted that, in the embodiment of the present application, the third downlink pilot is used for channel estimation, so as to eliminate an influence of a delay difference in data transmission between the first TRP and the second TRP on channel estimation, so that the channel estimation is more accurate.
It should be noted that, in some embodiments of the present application, the first channel characteristics further include channel characteristics of the first traffic data in addition to channel characteristics of the first downlink pilot. Similarly, the second channel characteristics include channel characteristics of the second traffic data in addition to channel characteristics of the second downlink pilot.
505. And the UE performs phase rotation inverse compensation on the frequency domain on the second channel characteristic according to the time delay difference to obtain a third channel characteristic.
After obtaining the delay difference between the first delay and the second delay, and performing channel estimation on the first downlink pilot frequency and the third downlink pilot frequency respectively to obtain the first channel characteristic and the second channel characteristic, the UE may further perform phase rotation inverse compensation on the frequency domain on the second channel characteristic according to the delay difference to obtain the third channel characteristic (see fig. 6 specifically). In some embodiments of the present application, specifically, the UE may convert the second channel characteristic from a time-domain expression to a frequency-domain expression, and convert the third channel characteristic from a time-domain expression to a frequency-domain expression, so as to obtain a frequency-domain data expression Z of the second channel characteristic 1 (jw) and frequency domain data representation Z of the third channel characteristic 2 (jw), if the delay difference between the first delay and the second delay is represented as Δ t, then Δ t, Y 2 (jw)、Y 1 The relationship between (jw) and Δ t satisfies: z 2 (jw)＝e jwΔt *Z 1 (jw), where w ═ 2 π kf, f is the subcarrier spacing, and k is the subcarrier number.
It should be noted that, in this embodiment of the present application, the UE performs channel estimation on the second downlink pilot to obtain a second channel characteristic, where the second channel characteristic includes a channel characteristic of the second downlink pilot and a channel characteristic of the second service data. In some other embodiments of the present application, the UE may also determine the channel characteristic of the second downlink pilot, perform phase rotation inverse compensation on the channel characteristic of the second downlink pilot to obtain the channel characteristic of the second downlink pilot after inverse compensation, then perform interpolation on the channel characteristic of the second downlink pilot after inverse compensation by using a second channel interpolation value to obtain the channel characteristic of the second service data after interpolation, and finally determine the corresponding second channel characteristic, where the second channel characteristic in this embodiment of the present application is the channel characteristic including the channel characteristic of the second downlink pilot after inverse compensation and the channel characteristic of the second service data after interpolation.
It should be further noted that, in the embodiment of the present application, since the second channel characteristics further include channel characteristics on the second service data, the purpose of performing phase rotation inverse compensation on the second channel characteristics (or performing phase rotation inverse compensation on the channel characteristics of the first downlink pilot) is to match the first service data with other service data in the target data packet, so that erroneous service data is not transmitted.
506. And the UE decodes the data according to the first channel characteristic and the third channel characteristic.
Finally, the UE may decode the first service data and the second service data that are not separated from the target data packet according to the obtained first channel characteristic and the third channel characteristic (because the first timing signal, the second timing signal, the first downlink pilot frequency, and the second downlink pilot frequency in the target data packet are separated during the channel separation process, only the first service data and the second service data are left in the target data packet, and the separation cannot be achieved).
It should be further noted that, the embodiment corresponding to fig. 5 is described by taking two TRPs as an example for a delay compensation method for data transmission, and may actually be applied to a plurality of TRPs (i.e. more than 2 TRPs), as long as in an actual application process, the UE obtains a target channel characteristic (e.g. a third channel characteristic) corresponding to each TRP according to a process similar to steps 501 to 505 as long as it obtains a delay difference between each TRP and a reference TRP (i.e. the TRP with the shortest delay), and finally decodes the traffic data according to the reference channel characteristic (e.g. the first channel characteristic) corresponding to the reference TRP and the target channel characteristic corresponding to each TRP.
In the embodiment of the present application, the UE performs phase rotation compensation on the frequency domain through a second downlink pilot () sent by a time-extended TRP (i.e., a second TRP) (performs phase rotation compensation using a delay difference between a first delay corresponding to the first TRP and a second delay corresponding to the second TRP), so as to obtain a third downlink pilot, and further performs channel estimation according to the third downlink pilot to obtain a second channel characteristic, so as to achieve a purpose of more accurate channel estimation through the above operations; and finally, decoding the service data according to the first channel characteristic and the third channel characteristic in a combined manner, and matching the service data with actual service data through phase rotation compensation.
In the embodiment corresponding to fig. 3 of the present application, the first TRP may be divided into functional modules according to the example of the above-mentioned delay compensation method for data transmission, for example, each functional module may be divided according to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.
For example, fig. 7 shows a schematic diagram of a first TRP, which may be provided in an embodiment of the present application and includes:
a determining module 701, configured to determine a first time delay, where the first time delay is an uplink time delay between the first TRP and a terminal device UE, and the first TRP is one of at least two TRPs that together provide a service for the UE;
an obtaining module 702, configured to obtain a delay difference between the first delay and a reference delay, where the reference delay is one of the at least two obtained uplink delays between the at least two TRPs and the UE and has a shortest duration, and the at least two TRPs correspond to the at least two uplink delays one to one;
a compensation module 703, configured to perform phase rotation compensation on the first downlink data in a frequency domain according to the time delay difference, so as to obtain second downlink data;
a sending module 704, configured to send the second downlink data to the UE.
Preferably, in some embodiments of the present application, the frequency domain data of the second downlink data is denoted as X 2 (jw), the frequency domain data of the first downlink data is represented as X 1 (jw) the delay difference is Δ t, X 2 (jw)、X 1 The relationship between (jw) and Δ t satisfies: x 2 (jw)＝e -jwΔt *X 1 (jw)。
Preferably, in some embodiments of the present application, the determining module 701 is specifically configured to: and receiving a measuring signal from the UE, and performing channel estimation according to the measuring signal to obtain the first time delay.
Preferably, in some embodiments of the present application,
the obtaining module 702 is specifically configured to:
transmitting the first time delay to a second TRP, wherein the second TRP is another one of the at least two TRPs; and receiving the reference delay from the second TRP; finally, the time delay difference is calculated according to the first time delay and the reference time delay;
or the like, or, alternatively,
the obtaining module 702 is specifically configured to:
sending the first time delay to the second TRP, so that the second TRP calculates the time delay difference according to the first time delay and the reference time delay; receiving the delay difference from the second TRP;
or the like, or, alternatively,
the acquisition module is specifically configured to:
receiving at least one uplink delay from the other TRPs except the first TRP among the at least two TRPs; determining the reference time delay according to the at least one uplink time delay and the first time delay; and finally, calculating the time delay difference according to the first time delay and the reference time delay.
Preferably, in some embodiments of the present application, the measurement signal comprises: SRS.
The specific function and structure of the first TRP in the embodiment corresponding to fig. 7 are used to implement the steps of processing by the first TRP in fig. 2 to fig. 5, and details thereof are not repeated herein.
Similarly, in the embodiment corresponding to fig. 5 of the present application, functional modules of the UE may also be divided according to the above-mentioned example of the method for compensating for the delay time of data transmission, for example, each functional module may be divided according to each function, or two or more functions may also be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.
For example, fig. 8 shows a schematic diagram of a UE, and the UE provided in the embodiment of the present application may include:
a determining module 801, configured to determine a delay difference according to a first delay and a second delay, where the first delay is a delay between the UE and a first TRP, the second delay is a delay between the UE and a second TRP, and the first delay is smaller than the second delay;
a receiving module 802, configured to receive a first downlink pilot from the first TRP and a second downlink pilot from the second TRP, where a delay of the first downlink pilot is the first delay and a delay of the second downlink pilot is the second delay;
a first compensation module 803, configured to perform phase rotation compensation on the frequency domain for the second downlink pilot according to the delay difference, so as to obtain a third downlink pilot;
a channel estimation module 804, configured to perform channel estimation on the first downlink pilot and the third downlink pilot respectively to obtain a first channel characteristic and a second channel characteristic, where the first channel characteristic is a channel characteristic between the first TRP and the UE, and the second channel characteristic is a channel characteristic between the second TRP and the UE;
a second compensation module 805, configured to perform phase rotation inverse compensation on the second channel characteristic in a frequency domain according to the delay difference, so as to obtain a third channel characteristic;
a decoding module 806, configured to decode the service data according to the first channel characteristic and the third channel characteristic.
Preferably, in some embodiments of the present application,the frequency domain data of the third pilot frequency is represented as Y 2 (jw), the frequency domain data of the second pilot is represented as Y 1 (jw) the delay difference is Δ t, Y 2 (jw)、Y 1 The relationship between (jw) and Δ t satisfies: y is 2 (jw)＝e -jwΔt *Y 1 (jw); the frequency domain data of the third channel characteristic is represented as Z 2 (jw), the frequency domain data of the second channel characteristics is represented as Z 1 (jw)，Z 1 (jw)、Z 2 The relationship between (jw) and Δ t satisfies: z 2 (jw)＝e jwΔt *Z 1 (jw)。
Preferably, in some embodiments of the present application, before the determining module 801 determines the delay difference according to the first delay and the second delay, the determining module 801 is further configured to:
receiving a first timing signal from the first TRP and a second timing signal from the second TRP, respectively, the first timing signal and the second timing signal being transmitted simultaneously and staggered in a frequency domain; and determining the first delay and the second delay according to the first timing signal and the second timing signal.
Preferably, in some embodiments of the present application, the first timing signal includes: a first TRS; the second timing signal includes: a second TRS.
The specific functions and structures of the UE in the embodiment corresponding to fig. 8 are used to implement the steps processed by the UE in fig. 2 to fig. 6, and are not repeated here.
Fig. 9 is another schematic diagram of a first TRP according to an embodiment of the present application, and for convenience of description, only a portion related to the embodiment of the present application is shown, and details of the method are not disclosed. For convenience of understanding, the first TRP is taken as an example of the base station, and is specifically shown in fig. 9.
The base station includes at least one processor 111, at least one memory 112, at least one transceiver 113, at least one network interface 114, and one or more antennas 115. The processor 111, the memory 112, the transceiver 113 and the network interface 114 are connected, for example, by a bus, and in this embodiment, the connection may include various interfaces, transmission lines or buses, which is not limited in this embodiment. The antenna 115 is connected to the transceiver 113. The network interface 114 is used for connecting the base station with other communication devices through a communication link, for example, the network interface 114 may include a network interface between the base station and a core network element, such as an S1 interface, and the network interface may include a network interface between the base station and other network devices (such as an access network device or a core network element), such as an X2 or Xn interface.
The processor 111 is mainly configured to process the communication protocol and the communication data, control the entire base station, execute a software program, and process data of the software program, for example, to support the base station to perform the actions described by the first TRP in the embodiments corresponding to fig. 2 to 5.
For example, in some embodiments of the present application, the processor 111 may specifically perform the following actions: determining a first time delay, obtaining a time delay difference between the first time delay and a reference time delay, and then performing phase rotation compensation on the first downlink data in a frequency domain according to the time delay difference to obtain second downlink data; and finally, sending the second downlink data to the corresponding UE.
In some embodiments of the present application, the manner in which the processor 111 determines the first time delay may specifically be: a measurement signal (e.g., SRS) is received from the corresponding UE through the network interface 114 (e.g., over the air interface, a new air interface, etc.), and then channel estimation is performed according to the measurement signal, so as to obtain a first time delay.
In some embodiments of the present application, the processor 111 may obtain the delay difference between the first delay and the reference delay by performing, but not limited to, one of the following operation modes:
the method I comprises the following steps: the processor 111 may send the first time delay corresponding to the base station to another base station through the network interface 114 (e.g., through the X2 interface), the another base station being another one of the plurality of base stations that together serve the same UE; then, the base station receives a reference time delay from another base station, wherein the reference time delay is determined by the other base station; and finally, the base station calculates the time delay difference between the first time delay and the reference time delay according to the first time delay and the reference time delay acquired from another base station.
The second method comprises the following steps: the processor 111 may send the first time delay corresponding to the base station to another base station through the network interface 114 (e.g., through the X2 interface), the another base station being another one of the plurality of base stations that together serve the same UE; then, after the base station determines the reference time delay, the processor of another base station directly calculates the time delay difference according to the first time delay and the reference time delay, and sends the calculated time delay difference to the base station through the network interface of another base station, that is, the processor 111 directly receives the time delay difference between the first time delay and the reference time delay from another base station.
The third method comprises the following steps: the processor 111 receives, through the network interface 114 (e.g., through an X2 interface), each uplink delay (including at least one uplink delay) corresponding to another base station (including at least one base station) from another base station, except the base station, of the plurality of base stations that provide services for the UE together, determines, by the processor 111, a reference delay according to each uplink delay corresponding to the another base station and the first delay obtained by the processor 111, and finally, calculates, by the processor 111, a delay difference according to the determined reference delay and the first delay.
The base station may include a baseband processor and a central processing unit, the baseband processor is mainly used for processing a communication protocol and communication data, and the central processing unit is mainly used for controlling the entire base station, executing a software program, and processing data of the software program. The processor 111 in fig. 9 may integrate the functions of a baseband processor and a central processing unit, and those skilled in the art will understand that the baseband processor and the central processing unit may also be independent processors, and are interconnected through a bus or the like. Those skilled in the art will appreciate that a base station may include multiple baseband processors to accommodate different network formats, multiple central processors to enhance its processing capability, and various components of the base station may be connected by various buses. The baseband processor can also be expressed as a baseband processing circuit or a baseband processing chip. The central processing unit can also be expressed as a central processing circuit or a central processing chip. The function of processing the communication protocol and the communication data may be built in the processor, or may be stored in the memory in the form of a software program, and the processor executes the software program to realize the baseband processing function.
The memory is used primarily for storing software programs and data. The memory 112 may be separate and coupled to the processor 111. Alternatively, the memory 112 may be integrated with the processor 111, for example, within one chip. The memory 112 can store program codes for executing the technical solutions of the embodiments of the present application, and the processor 111 controls the execution of the program codes, and various executed computer program codes can also be regarded as drivers of the processor 111.
Fig. 9 shows only one memory and one processor. In an actual base station, there may be multiple processors and multiple memories. The memory may also be referred to as a storage medium or a storage device, etc. The memory may be a memory element on the same chip as the processor, that is, an on-chip memory element, or a separate memory element, which is not limited in this embodiment.
The transceiver 113 may be configured to support receiving or transmitting radio frequency signals between the base station and the terminal, for example, to support operations of the base station transmitting second downlink data to the UE, the base station receiving a measurement signal from the UW, and the like in this embodiment. The transceiver 113 may be connected to an antenna 115. The transceiver 113 includes a transmitter Tx and a receiver Rx. Specifically, one or more antennas 115 may receive a radio frequency signal, and the receiver Rx of the transceiver 113 is configured to receive the radio frequency signal from the antenna, convert the radio frequency signal into a digital baseband signal or a digital intermediate frequency signal, and provide the digital baseband signal or the digital intermediate frequency signal to the processor 111, so that the processor 111 performs further processing on the digital baseband signal or the digital intermediate frequency signal, such as demodulation processing and decoding processing. In addition, the transmitter Tx in the transceiver 113 is also used to receive a modulated digital baseband signal or a digital intermediate frequency signal from the processor 111, convert the modulated digital baseband signal or the digital intermediate frequency signal into a radio frequency signal, and transmit the radio frequency signal through the one or more antennas 115. Specifically, the receiver Rx may selectively perform one or more stages of down-mixing and analog-to-digital conversion processes on the rf signal to obtain a digital baseband signal or a digital intermediate frequency signal, wherein the order of the down-mixing and analog-to-digital conversion processes is adjustable. The transmitter Tx may selectively perform one or more stages of up-mixing and digital-to-analog conversion processes on the modulated digital baseband signal or the digital intermediate frequency signal to obtain the rf signal, where the order of the up-mixing and digital-to-analog conversion processes is adjustable. The digital baseband signal and the digital intermediate frequency signal may be collectively referred to as a digital signal.
A transceiver may also be referred to as a transceiver unit, transceiver, transceiving means, etc. Optionally, a device for implementing a receiving function in the transceiver unit may be regarded as a receiving unit, and a device for implementing a sending function in the transceiver unit may be regarded as a sending unit, that is, the transceiver unit includes a receiving unit and a sending unit, the receiving unit may also be referred to as a receiver, an input port, a receiving circuit, and the like, and the sending unit may be referred to as a transmitter, a sending circuit, and the like.
The steps performed by the first TRP in the embodiments corresponding to fig. 2 to 5 described above may be implemented based on the structure shown in fig. 9.
Fig. 10 is another schematic diagram of a UE according to an embodiment of the present application. For convenience of explanation, only the parts related to the embodiments of the present application are shown, and details of the technology are not disclosed. The UE may include a cell phone, a tablet, a smart watch, a personal computer, and the like. Take UE as a mobile phone for explanation:
the handset includes Radio Frequency (RF) circuitry 1010, memory 1020, input unit 1030, display unit 1040, sensor 1050, audio circuitry 1060, WiFi module 1070, processor 1080, power supply 1090, and the like. Those skilled in the art will appreciate that the handset configuration shown in fig. 10 is not intended to be limiting and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
The following describes each component of the mobile phone in detail with reference to fig. 10:
the RF circuit 1010 may be configured to receive and transmit signals during a message transmission or call, and in particular, to receive downlink information (e.g., first downlink data, second downlink data, service data, etc. in this embodiment) of a base station (e.g., the base station illustrated in fig. 9 and including a 5G new air interface), and then process the received downlink information to the processor 1080. In addition, data relating to uplink is transmitted to the base station.
For example, in some embodiments of the present application, the RF circuit 1010 may specifically perform the following actions: after the UE determines the delay difference according to the first delay and the second delay, the UE receives the first downlink pilot from the first base station (i.e., the base station corresponding to fig. 9) and receives the second downlink pilot from the second base station (i.e., another one of the base stations serving the UE corresponding to fig. 9, which may be referred to as the second base station) through the RF circuit 1010.
For another example, in some embodiments of the present application, before the UE determines the delay difference according to the first delay and the second delay, the UE may also receive a first timing signal (e.g., a first TRS) from the first base station and a second timing signal (e.g., a second TRS) from the second base station through the RF circuit 1010, respectively, so that the processor 1080 of the UE may determine the first delay and the second delay according to the first timing signal and the second timing signal.
In general, RF circuit 1010 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a Low Noise Amplifier (LNA), a duplexer, and the like. In addition, the RF circuitry 1010 may also communicate with networks and other devices via wireless communications. The wireless communication may use any communication standard or protocol, including but not limited to global system for mobile communications (GSM), General Packet Radio Service (GPRS), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Long Term Evolution (LTE), email, Short Message Service (SMS), etc.
The memory 1020 may be used for storing software programs and modules, and the processor 1080 executes various functional applications and data processing of the mobile phone by operating the software programs and modules stored in the memory 1020, that is, for executing actions described by the UE in the corresponding embodiments of fig. 2 to 6.
For example, in some embodiments of the present application, processor 1080 may specifically perform the following acts: the processor 1080 determines the delay difference according to a first delay and a second delay, where the first delay is a delay between the mobile phone and the base station (i.e., the first base station) corresponding to fig. 9, and the second delay is a delay between the mobile phone and another base station (i.e., the second base station) of the plurality of base stations serving the UE corresponding to fig. 9, and the first delay is smaller than the second delay; then, the processor 1080 receives a first downlink pilot from the first base station and a second downlink pilot from the second base station through the RE circuit 1010, where a delay of the first downlink pilot is a first delay, and a delay of the second downlink pilot is a second delay; then, the processor 1080 performs phase rotation compensation on the frequency domain on the second downlink pilot frequency according to the obtained delay difference, so as to obtain a third downlink pilot frequency; processor 1080 further performs channel estimation on the first downlink pilot frequency and the third downlink pilot frequency to obtain a first channel characteristic and a second channel characteristic, where the first channel characteristic is a channel characteristic between the first base station and the UE, and the second channel characteristic is a channel characteristic between the second base station and the UE; finally, the processor 1080 performs phase rotation inverse compensation on the frequency domain on the second channel characteristic according to the time delay difference to obtain a third channel characteristic, and finally decodes the service data according to the first channel characteristic and the third channel characteristic.
In some embodiments of the present application, before the processor 1080 determines the delay difference according to the first delay and the second delay, the processor 1080 may further receive a first timing signal (e.g., a first TRS) from the first base station and a second timing signal (e.g., a second TRS) from the second base station through the RF circuit 1010, respectively, and then the processor 1080 determines the first delay and the second delay according to the first timing signal and the second timing signal.
The memory 1020 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. Further, the memory 1020 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.
The input unit 1030 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the cellular phone. Specifically, input unit 1030 may include touch panel 1031, off-screen fingerprints 1032, and other input devices 1033. The touch panel 1031, also referred to as a touch screen, may collect touch operations by a user (e.g., operations by a user on or near the touch panel 1031 using any suitable object or accessory such as a finger, a stylus, etc.) and drive corresponding connection devices according to a preset program. Alternatively, the touch panel 1031 may include two parts, a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, and sends the touch point coordinates to the processor 1080, and can receive and execute commands sent by the processor 1080. In addition, the touch panel 1031 may be implemented in various types such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave, and the input unit 1030 may include other input devices 1033 in addition to the touch panel 1031. In particular, other input devices 1033 may include, but are not limited to, one or more of a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and the like. It should be noted that in some full-screen mobile phones, the input unit 1030 may further include an off-screen fingerprint 1032 (e.g., an optical fingerprint, an ultrasonic fingerprint, etc.) in addition to the touch panel 1031, which is not limited herein.
The display unit 1040 may be used to display information input by a user or information provided to the user and various menus of the cellular phone. The display unit 1040 may include a display screen 1041 (also referred to as a display panel 1041), and optionally, in this embodiment, the display unit 1040 of the mobile phone includes a display screen configured in the form of an LCD screen or an OLED screen. Further, the touch panel 1031 can cover the display screen 1041, and when the touch panel 1031 detects a touch operation on or near the touch panel 1031, the touch panel 1031 transmits the touch operation to the processor 1080 to determine the type of the touch event, and then the processor 1080 provides a corresponding visual output on the display screen 1041 according to the type of the touch event. Although in fig. 10, the touch panel 1031 and the display screen 1041 are two separate components to implement the input and output functions of the mobile phone, in some embodiments, the touch panel 1031 and the display screen 1041 may be integrated to implement the input and output functions of the mobile phone.
The handset may also include at least one sensor 1050, such as a light sensor, motion sensor, and other sensors. Specifically, the light sensor may include an ambient light sensor and a proximity sensor, where the ambient light sensor may adjust the brightness of the display screen 1041 according to the brightness of ambient light, in this embodiment, when the display attribute of the target background pattern is brightness, the mobile phone may obtain the brightness of the environment where the mobile phone is located through the light sensor, and further determine the brightness of the target background pattern according to the brightness of the environment. The proximity sensor may turn off the display 1041 and/or the backlight when the phone is moved to the ear. As one of the motion sensors, the accelerometer sensor can detect the magnitude of acceleration in each direction (generally, three axes), can detect the magnitude and direction of gravity when stationary, and can be used for applications of recognizing the posture of a mobile phone (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration recognition related functions (such as pedometer and tapping), and the like; as for other sensors such as a gyroscope, a barometer, a hygrometer, a thermometer, and an infrared sensor, which can be configured on the mobile phone, further description is omitted here.
Audio circuitry 1060, speaker 1061, microphone 1062 may provide an audio interface between the user and the handset. The audio circuit 1060 can transmit the electrical signal converted from the received audio data to the speaker 1061, and the electrical signal is converted into a sound signal by the speaker 1061 and output; on the other hand, the microphone 1062 converts the collected sound signals into electrical signals, which are received by the audio circuit 1060 and converted into audio data, which are then processed by the audio data output processor 1080 and then sent to another mobile phone via the RF circuit 1010, or output to the memory 1020 for further processing.
WiFi belongs to short-distance wireless transmission technology, and the mobile phone can help the user to receive and send e-mail, browse web page and access streaming media etc. through WiFi module 1070, it provides wireless broadband internet access for the user. Although fig. 10 shows the WiFi module 1070, it is understood that it does not belong to the essential constitution of the handset, and may be omitted entirely as needed within the scope not changing the essence of the invention.
The processor 1080 is a control center of the mobile phone, connects various parts of the whole mobile phone by using various interfaces and lines, and executes various functions of the mobile phone and processes data by operating or executing software programs and/or modules stored in the memory 1020 and calling data stored in the memory 1020, thereby integrally monitoring the mobile phone. Optionally, processor 1080 may include one or more processing units; preferably, the processor 1080 may integrate an application processor, which handles primarily the operating system, user interfaces, applications, etc., and a modem processor, which handles primarily the wireless communications. It is to be appreciated that the modem processor described above may not be integrated into processor 1080.
The handset also includes a power source 1090 (e.g., a battery) for powering the various components, which may preferably be logically coupled to the processor 1080 via a power management system to manage charging, discharging, and power consumption via the power management system.
Although not shown, the mobile phone may further include a camera, a bluetooth module, etc., which are not described herein.
The steps executed by the UE in the embodiments corresponding to fig. 2 to fig. 6 may be implemented based on the structure shown in fig. 10, and are not described in detail here.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product.
The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium. The computer-readable storage medium can be any available medium that a computer can store or a data storage device, such as a server, a data center, etc., that is integrated with one or more available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid state disk), among others.

Claims (8)

1. A method for compensating for delay in data transmission, comprising:
the UE determines a delay difference according to a first delay and a second delay, wherein the first delay is a delay between the UE and a first TRP, the second delay is a delay between the UE and a second TRP, and the first delay is smaller than the second delay;
the UE receives a first downlink pilot frequency from the first TRP and a second downlink pilot frequency from the second TRP, wherein the time delay of the first downlink pilot frequency is the first time delay, and the time delay of the second downlink pilot frequency is the second time delay;
the UE performs phase rotation compensation on the frequency domain on the second downlink pilot frequency according to the time delay difference to obtain a third downlink pilot frequency;
the UE respectively carries out channel estimation on the first downlink pilot frequency and the third downlink pilot frequency to obtain a first channel characteristic and a second channel characteristic, wherein the first channel characteristic is a channel characteristic between the first TRP and the UE, and the second channel characteristic is a channel characteristic between the second TRP and the UE;
the UE performs phase rotation inverse compensation on the frequency domain on the second channel characteristic according to the time delay difference to obtain a third channel characteristic;
and the UE decodes the service data according to the first channel characteristic and the third channel characteristic.
2. The method of claim 1, wherein:
the frequency domain data of the third downlink pilot frequency is represented as Y 2 (jw), the frequency domain data of the second downlink pilot is represented as Y 1 (jw), said time delay difference is Δ t, Y 2 (jw)、Y 1 The relationship between (jw) and Δ t satisfies:
Y 2 (jw)＝e -jwΔt *Y 1 (jw)；
the frequency domain data of the third channel characteristic is represented as Z 2 (jw), the frequency domain data of the second channel characteristics is represented as Z 1 (jw)，Z 1 (jw)、Z 2 The relationship between (jw) and Δ t satisfies:
Z 2 (jw)＝e jwΔt *Z 1 (jw)。
3. the method of any of claims 1-2, wherein prior to the UE determining the delay difference based on the first delay and the second delay, the method further comprises:
the UE respectively receives a first timing signal from the first TRP and a second timing signal from the second TRP, and the first timing signal and the second timing signal are simultaneously transmitted and staggered on a frequency domain;
and the UE determines the first time delay and the second time delay according to the first timing signal and the second timing signal.
4. The method of claim 3,
the first timing signal includes: a first synchronization timing signal TRS;
the second timing signal includes: a second TRS.
5. A terminal equipment (UE), comprising:
the UE implements the method of any one of claims 1-4 by hardware or by hardware executing corresponding software, the hardware or the software comprising one or more modules corresponding to the method of any one of claims 1-4.
6. A communications apparatus comprising a processor coupled with a memory, the memory configured to store a computer program or instructions, the processor configured to execute the computer program or instructions in the memory such that the method of any of claims 1-4 is performed.
7. A chip, characterized in that the chip comprises a processor and a communication interface, the communication interface being coupled with the processor, the processor being configured to execute a computer program or instructions such that the method of any of claims 1-4 is performed.
8. A computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to perform the method of any one of claims 1-4.
CN201910818401.0A 2019-08-30 2019-08-30 Time delay compensation method for data transmission, terminal equipment and TRP Active CN112448783B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201910818401.0A CN112448783B (en) 2019-08-30 2019-08-30 Time delay compensation method for data transmission, terminal equipment and TRP
PCT/CN2020/110719 WO2021036969A1 (en) 2019-08-30 2020-08-24 Data transmission latency compensation method, terminal device and trp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910818401.0A CN112448783B (en) 2019-08-30 2019-08-30 Time delay compensation method for data transmission, terminal equipment and TRP

Publications (2)

Publication Number Publication Date
CN112448783A CN112448783A (en) 2021-03-05
CN112448783B true CN112448783B (en) 2022-09-02

Family

ID=74684059

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910818401.0A Active CN112448783B (en) 2019-08-30 2019-08-30 Time delay compensation method for data transmission, terminal equipment and TRP

Country Status (2)

Country Link
CN (1) CN112448783B (en)
WO (1) WO2021036969A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115412463A (en) * 2021-05-28 2022-11-29 中国移动通信有限公司研究院 Time delay measuring method and device and digital twin network
KR20220162520A (en) * 2021-06-01 2022-12-08 삼성전자주식회사 Method and apparatus for time and phase synchronization between base stations in network cooperative communications
CN116456361A (en) * 2022-01-07 2023-07-18 大唐移动通信设备有限公司 Method, device and equipment for reporting timing measurement, timing configuration and information transmission
CN114466450B (en) * 2022-02-28 2022-09-13 广州爱浦路网络技术有限公司 TRP positioning method, system, device and storage medium based on 5G

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101917381A (en) * 2010-08-20 2010-12-15 西安电子科技大学 Method for compensating delay difference among cells in cooperative multi-point transmission system
CN102118825A (en) * 2009-12-31 2011-07-06 华为技术有限公司 Method for realizing multipoint joint transmission, terminal and system
EP2837120A1 (en) * 2012-04-09 2015-02-18 Samsung Electronics Co., Ltd. Methods and apparatus for cyclic prefix reduction in mmwave mobile communication systems
CN108365997A (en) * 2017-01-26 2018-08-03 华为技术有限公司 A kind of information transferring method and device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102958084B (en) * 2011-08-23 2018-03-02 中兴通讯股份有限公司 The correcting method and system of a kind of delay inequality
EP2920934B1 (en) * 2012-11-14 2020-12-23 Telefonaktiebolaget LM Ericsson (publ) Pilot signal transmission method, associated transmit-receive point, pilot signal reception method and associated user equipment
US11121897B2 (en) * 2017-09-08 2021-09-14 Apple Inc. System and method for PUCCH transmission scheme
EP3759946A1 (en) * 2018-02-26 2021-01-06 Telefonaktiebolaget LM Ericsson (publ) Optimizing usage of a coordinated service

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102118825A (en) * 2009-12-31 2011-07-06 华为技术有限公司 Method for realizing multipoint joint transmission, terminal and system
CN101917381A (en) * 2010-08-20 2010-12-15 西安电子科技大学 Method for compensating delay difference among cells in cooperative multi-point transmission system
EP2837120A1 (en) * 2012-04-09 2015-02-18 Samsung Electronics Co., Ltd. Methods and apparatus for cyclic prefix reduction in mmwave mobile communication systems
CN108365997A (en) * 2017-01-26 2018-08-03 华为技术有限公司 A kind of information transferring method and device

Also Published As

Publication number Publication date
CN112448783A (en) 2021-03-05
WO2021036969A1 (en) 2021-03-04

Similar Documents

Publication Publication Date Title
CN112448783B (en) Time delay compensation method for data transmission, terminal equipment and TRP
CN110167091B (en) Receiving method, sending method, terminal and base station of downlink channel
CN113382439B (en) Information reporting method, access mode determining method, terminal and network equipment
CN111278042B (en) Information reporting method and terminal
CN111182579B (en) Positioning measurement information reporting method, terminal and network equipment
WO2021155793A1 (en) Positioning method, terminal and network device
EP3927002A1 (en) Measurement processing method, parameter configuration method, terminal, and network device
CN110475364B (en) Method and terminal for receiving non-periodic tracking reference signal
CN110769505A (en) Random access method, terminal and network equipment
WO2019101063A1 (en) Data transmission method and relevant apparatus
CN111030776B (en) Data transmission method, electronic equipment and network side equipment
CN111835482A (en) Quasi co-location QCL information determining method, configuration method and related equipment
WO2019214663A1 (en) Quasi co-location configuration method, terminal, and network device
CN110896560B (en) Uplink signal sending method and terminal
CN110311706B (en) Interference processing method and mobile terminal
US11259323B2 (en) Random access method and user equipment
CN109217995B (en) Data processing method, terminal and base station
CN113382423B (en) Signal transmission method, information indication method and related equipment
US20230337175A1 (en) Method for reporting positioning capability, terminal device, and network device
CN112787780B (en) SRS emission setting method, information configuration method, positioning method and related equipment
CN110868240A (en) Frequency hopping method, terminal and network equipment during PUSCH (physical uplink shared channel) repeated transmission
CN110831172A (en) Determination method, terminal and network equipment
US20210067390A1 (en) Uplink transmission method and terminal
CN111149313A (en) Data transmission method and equipment
CN111800861A (en) Power control method and equipment

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant