CN107623648B - Service data sending method and first physical cell - Google Patents
Service data sending method and first physical cell Download PDFInfo
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Abstract
A service data sending method and a first physical cell are used for solving the problem that a channel experienced by downlink service data received by UE (user equipment) through independent scheduling is inconsistent with a channel experienced by a public pilot signal used for demodulation. The method comprises the following steps: the first physical cell determines at least one second physical cell; the first physical cell determines downlink channel information from the first physical cell to the independently scheduled UE and downlink channel information from each second physical cell in at least one second physical cell to the independently scheduled UE; the first physical cell respectively determines the downlink channel compensation amount of each second physical cell according to the downlink channel information of the first physical cell and the downlink channel information of each second physical cell; the first physical cell compensates the downlink channel of the service data according to the downlink channel compensation quantity of each second physical cell to obtain a downlink channel equivalent to the downlink channel of the common pilot signal; and the first physical cell transmits the service data to the independent scheduling UE on the equivalent downlink channel.
Description
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a method for sending service data and a first physical cell.
Background
An Adaptive Single Frequency Network (ASFN) can effectively solve the problem of performance reduction caused by adjacent cell interference of an edge user, can remarkably improve the satisfaction degree of the whole Network user, and meets the system capacity requirement.
All physical cells (pCell) in the ASFN use the same logical Cell (L logical Cell) identifier, use the same frequency point to serve User Equipment (User Equipment, UE), each physical Cell includes one or more Remote Radio Unit (RRU), based on the difference in signal strength of different physical cells received by the UE, the UE is divided into a joint scheduling UE and an independent scheduling UE. joint scheduling UE in an edge overlapping area of a plurality of physical cells, there are a plurality of physical cells serving the UE.
Taking the schematic diagram of the working principle of the ASFN shown in fig. 1 as an example, UE1 and UE2 in fig. 1 are jointly scheduled UEs, physical cells serving UE1 include physical cell 1(pCell 1) and physical cell 2(pCell 2), and physical cells serving UE2 include physical cell 1, physical cell 2, and physical cell 3. UE3 and UE4 in fig. 1 are independently scheduled UEs, the physical cell serving UE3 has physical cell 3(pCell 3), and the physical cell serving UE4 has physical cell 2.
Within the ASFN, all physical cells use the same logical Cell identity, and the same common pilot signal, e.g., Cell-Specific Reference Single (CRS), is transmitted on each physical Cell. The downlink service data received by the UE with independent scheduling is independently transmitted by one physical cell providing service for the UE with independent scheduling, and the common pilot signal received by the UE with independent scheduling is jointly transmitted by a plurality of physical cells. Therefore, the problem that the channel experienced by the downlink service data is inconsistent with the channel experienced by the common pilot signal exists when the UE is independently scheduled to demodulate the downlink service data based on the received common pilot signal.
Disclosure of Invention
The embodiment of the invention provides a service data sending method and a first physical cell, which are used for solving the problem that a channel experienced by downlink service data received by independently scheduled UE is inconsistent with a channel experienced by a public pilot signal used for demodulation, and improving the demodulation capability of the independently scheduled UE.
In a first aspect, a method for sending service data provided in an embodiment of the present invention includes:
a first physical cell determines at least one second physical cell, wherein the at least one second physical cell comprises a physical cell which causes the problem that the downlink channel of service data exists in the service data demodulation of independent scheduling User Equipment (UE) and the downlink channel of a common pilot signal is inconsistent, the first physical cell is a physical cell which provides service for the independent scheduling UE, and the first physical cell and the at least one second physical cell use the same logical cell identifier;
the first physical cell determines downlink channel information from the first physical cell to the independently scheduled UE and downlink channel information from each second physical cell in the at least one second physical cell to the independently scheduled UE;
the first physical cell respectively determines the downlink channel compensation quantity of each second physical cell according to the downlink channel information of the first physical cell and the downlink channel information of each second physical cell;
the first physical cell compensates the downlink channel of the service data according to the downlink channel compensation amount of each second physical cell to obtain a downlink channel equivalent to the downlink channel of the common pilot signal;
and the first physical cell sends service data to the independent scheduling UE on the equivalent downlink channel.
In the method, because the channel experienced by the downlink service data received by the independently scheduled UE is an equivalent channel, the equivalent channel is consistent with the channel experienced by the common pilot signal used for demodulation, and the common pilot signal used for demodulation is jointly transmitted by at least one second physical cell and the first physical cell which have interference on the service data demodulation of the independently scheduled UE, the channel experienced by the downlink service data received by the independently scheduled UE is consistent with the channel experienced by the common pilot signal used for demodulation, thereby improving the demodulation capability of the independently scheduled UE.
In one possible implementation, the determining, by the first physical cell, at least one second physical cell includes:
the first physical cell determines Reference Signal Received Power (RSRP) of a probe signal sent by the UE which is received by the first physical cell and RSRP of the probe signal sent by the UE which is received by each physical cell in all physical cells using the same logical cell identification with the first physical cell;
the first physical cell respectively calculates the difference value of the RSRP of the first physical cell and the RSRP of each physical cell, and determines at least one physical cell corresponding to the difference value larger than or equal to a preset threshold value as the at least one second physical cell.
In this way, at least one second physical cell causing the problem of inconsistency between the downlink channel of the service data and the downlink channel of the common pilot signal in the service data demodulation of the independently scheduled UE can be selected according to the RSRP of the first physical cell and the RSRP of each of all physical cells using the same logical cell identifier as the first physical cell, and the common pilot signal is jointly transmitted using the physical cells using the same logical cell identifier.
In a possible implementation manner, the determining, by the first physical cell, downlink channel information from each second physical cell in the at least one second physical cell to the independently scheduled UE includes:
the first physical cell acquires uplink channel information from the independently scheduled UE to each second physical cell;
and the first physical cell estimates and obtains the downlink channel information of each second physical cell according to the uplink channel information from the independently scheduled UE to each second physical cell based on the reciprocity principle of the uplink and downlink channels.
Under the condition that the reciprocity principle of the uplink and downlink channels is established, the large-scale fading of the downlink channel can be estimated as the large-scale fading of the uplink channel, and the small-scale fading of the downlink channel can be estimated as the small-scale fading of the uplink channel.
In a possible implementation manner, the determining, by the first physical cell, the downlink channel compensation amount of each second physical cell according to the downlink channel information of the first physical cell and the downlink channel information of each second physical cell respectively includes:
the first physical cell is passed through a formula
Determining downlink channel compensation amount of each second physical cell respectively, wherein delta represents the downlink channel compensation amount of the second physical cell L1Indicating that the downlink channel information of the first physical cell includes large-scale fading of the downlink channel, L2Represents the firstThe downlink channel information of the two physical cells comprises large-scale fading H of the downlink channel1Indicating that the downlink channel information of the first physical cell includes a small-scale fading, H, of the downlink channel2A downlink channel small-scale fading included in the downlink channel information indicating the second physical cell (·)HThe complex conjugate transpose operation of matrix calculation is shown, and (a ⊙ B) the dot product operation of matrix a and matrix B is shown.
In a possible implementation manner, the compensating, by the first physical cell, the downlink channel of the service data of the first physical cell according to the downlink channel compensation amount of each second physical cell to obtain a downlink channel equivalent to the downlink channel of the common pilot signal includes:
the first physical cell is represented by formula a-L1(I+Δ1+Δ2+...+Δn)H1Compensating a downlink channel of self service data to obtain a downlink channel equivalent to the downlink channel of the common pilot signal, wherein A represents the equivalent downlink channel, I represents an identity matrix, and delta1、Δ2、...、ΔnRespectively representing the downlink channel compensation amount of each second physical cell, n representing the number of physical cells in the at least one second physical cell, L1Indicating that the downlink channel information of the first physical cell includes downlink channel large-scale fading, H1And indicating the small-scale fading of the downlink channel included in the downlink channel information of the first physical cell.
In a second aspect, an embodiment of the present invention provides a first physical cell, including:
a processing unit, configured to determine at least one second physical cell, where the at least one second physical cell includes a physical cell that causes a problem of inconsistency between a downlink channel of service data and a downlink channel of a common pilot signal in service data demodulation of an independent scheduling User Equipment (UE), where a first physical cell is a physical cell that provides a service for the independent scheduling UE, and the first physical cell and the at least one second physical cell use a same logical cell identifier;
determining downlink channel information from the UE to the independent scheduling UE and downlink channel information from each second physical cell in the at least one second physical cell to the independent scheduling UE;
respectively determining the downlink channel compensation amount of each second physical cell according to the downlink channel information of the second physical cell and the downlink channel information of each second physical cell;
the cell compensates the downlink channel of the service data according to the downlink channel compensation quantity of each second physical cell to obtain a downlink channel equivalent to the downlink channel of the common pilot signal;
and the transceiving unit is used for sending service data to the independent scheduling UE on the equivalent downlink channel determined by the processing unit.
Because the channel experienced by the downlink service data received by the independently scheduled UE is an equivalent channel, the equivalent channel is consistent with the channel experienced by the common pilot signal used for demodulation, and the common pilot signal used for demodulation is jointly transmitted by at least one second physical cell and a first physical cell which have interference on the service data demodulation of the independently scheduled UE, the channel experienced by the downlink service data received by the independently scheduled UE is consistent with the channel experienced by the common pilot signal used for demodulation through the first physical cell, and the demodulation capability of the independently scheduled UE is improved.
In a possible implementation manner, when the processing unit determines at least one second physical cell, the processing unit is specifically configured to:
determining Reference Signal Received Power (RSRP) of the first physical cell for receiving the probe signals sent by the independently scheduled UE, and RSRP of the probe signals sent by the independently scheduled UE received by each of all physical cells using the same logical cell identifier as the first physical cell;
and respectively calculating the difference value of the RSRP of the first physical cell and the RSRP of each physical cell, and determining at least one physical cell corresponding to the difference value which is greater than or equal to a preset threshold value as the at least one second physical cell.
In this way, the processing unit may select, according to the RSRP of the first physical cell and the RSRPs of each of all physical cells using the same logical cell identifier as the first physical cell, at least one second physical cell causing a problem that a downlink channel of service data is inconsistent with a downlink channel of a common pilot signal in service data demodulation of the independently scheduled UE, and jointly transmit the common pilot signal using the physical cells of the same logical cell identifier.
In a possible implementation manner, when determining downlink channel information from each of the at least one second physical cell to the independently scheduled UE, the processing unit is specifically configured to:
acquiring uplink channel information from the independently scheduled UE to each second physical cell;
and estimating and obtaining the downlink channel information of each second physical cell according to the uplink channel information from the independently scheduled UE to each second physical cell based on the reciprocity principle of the uplink and downlink channels.
In a possible implementation manner, when determining the downlink channel compensation amount of each second physical cell according to the downlink channel information of the processing unit and the downlink channel information of each second physical cell, the processing unit is specifically configured to:
by the formula
Determining downlink channel compensation amount of each second physical cell respectively, wherein delta represents the downlink channel compensation amount of the second physical cell L1Indicating that the downlink channel information of the first physical cell includes large-scale fading of the downlink channel, L2Indicating the downlink channel information of the second physical cell includes the downlink channel large-scale fading, H1Indicating that the downlink channel information of the first physical cell includes a small-scale fading, H, of the downlink channel2A downlink channel small-scale fading included in the downlink channel information indicating the second physical cell (·)HComplex conjugate transpose operation for matrix representationAnd (a ⊙ B) represents a dot product operation of matrix a and matrix B.
In a possible implementation manner, when the processing unit compensates the downlink channel of the service data according to the downlink channel compensation amount of each second physical cell to obtain a downlink channel equivalent to the downlink channel of the common pilot signal, the processing unit is specifically configured to:
by formula A-L1(I+Δ1+Δ2+...+Δn)H1Compensating a downlink channel of self service data to obtain a downlink channel equivalent to the downlink channel of the common pilot signal, wherein A represents the equivalent downlink channel, I represents an identity matrix, and delta1、Δ2、...、ΔnRespectively representing the downlink channel compensation amount of each second physical cell, n representing the number of physical cells in the at least one second physical cell, L1Indicating that the downlink channel information of the first physical cell includes downlink channel large-scale fading, H1And indicating the small-scale fading of the downlink channel included in the downlink channel information of the first physical cell.
In the technical scheme provided by the embodiment of the invention, after at least one second physical cell which has interference on the service data demodulation of the independently scheduled UE is determined by the first physical cell, the first physical cell respectively determines the downlink channel compensation amount of each second physical cell according to the downlink channel information of the first physical cell and the downlink channel information of each second physical cell; then the first physical cell compensates the downlink channel of the first physical cell according to the downlink channel compensation amount of each second physical cell to obtain an equivalent downlink channel; and finally, the first physical cell sends service data to the independent scheduling UE on the equivalent downlink channel. Because the channel experienced by the downlink service data received by the independently scheduled UE is an equivalent channel, the equivalent channel is consistent with the channel experienced by the common pilot signal used for demodulation, and the common pilot signal used for demodulation is jointly transmitted by at least one second physical cell and the first physical cell which have interference on the service data demodulation of the independently scheduled UE, the channel experienced by the downlink service data received by the independently scheduled UE is consistent with the channel experienced by the common pilot signal used for demodulation, thereby improving the demodulation capability of the independently scheduled UE.
Drawings
Fig. 1 is a schematic diagram illustrating an ASFN system according to the prior art;
fig. 2 is a schematic flow chart of a method for sending service data according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating information interaction between physical cells in an L TE networking system according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a Cloud-RAN architecture of a cellular network according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating an operation principle of an ASFN system according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a network architecture of an SFN + ASFN hybrid network according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a first physical cell according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a first physical cell according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a service data sending method and a first physical cell, which are used for solving the problem that a channel experienced by downlink service data received by independently scheduled UE is inconsistent with a channel experienced by a public pilot signal used for demodulation, and improving the demodulation capability of the independently scheduled UE. The method and the first physical cell are based on the same inventive concept, and because the principles of the method and the first physical cell for solving the problem are similar, the implementation of the first physical cell and the method can be referred to each other, and repeated parts are not described again.
The technical scheme provided by the embodiment of the invention is suitable for an ASFN system, wherein the ASFN comprises a plurality of physical cells, all the physical cells use the same logical cell identification and use the same frequency point to provide service for UE, and each physical cell comprises one or more RRUs. Based on the fact that the UE receives different signals of different physical cells with different strengths, the UE is divided into a joint scheduling UE and an independent scheduling UE. The UE is in the edge overlapping area of a plurality of physical cells in joint scheduling, and a plurality of physical cells for providing service for the UE are provided. And independently scheduling the UE to be positioned near a certain physical cell, wherein the signals of other physical cells received by the UE are weaker, and the physical cell serving the UE is the physical cell with the strongest signal received by the UE. The UE is independently scheduled based on the isolation of large-scale fading, so that the interference among different physical cells is avoided, the spatial multiplexing of multiple UEs is realized, and the system capacity is further improved.
Taking the schematic diagram of the working principle of the ASFN system shown in fig. 1 as an example, UE1 and UE2 in fig. 1 are jointly scheduling UEs, physical cells serving UE1 include physical cell 1 and physical cell 2, and physical cells serving UE2 include physical cell 1, physical cell 2, and physical cell 3. UE3 and UE4 in fig. 1 are independently scheduled UEs, and the physical cell serving UE3 has physical cell 3 and the physical cell serving UE4 has physical cell 2.
A Wireless Terminal Device may communicate with one or more core networks via a Radio Access Network (RAN), and may be a Mobile Terminal Device, such as a Mobile phone (or referred to as a "cellular" phone) and a computer having a Mobile Terminal Device, such as a portable, pocket, hand-held, computer-included, or vehicle-mounted Mobile Device, which exchanges languages and/or data with the Radio Access Network.
The technical solutions provided by the embodiments of the present invention are described in detail below by specific embodiments, and it should be noted that the display order of the embodiments only represents the sequence of the embodiments, and does not represent the merits of the technical solutions provided by the embodiments.
Example one
As shown in fig. 2, an embodiment of the present invention provides a method for sending service data, including:
s201, the first physical cell determines at least one second physical cell.
The UE located in the area near the first physical cell receives the strongest signal sent by the first physical cell, and the UE is far away from other physical cells, so that the signals sent by other physical cells are received weakly, the system determines the UE as the independently scheduled UE, and the first physical cell is the physical cell for providing service for the independently scheduled UE.
The at least one second physical cell determined by the first physical cell comprises a physical cell causing the problem that the downlink channel of the service data is inconsistent with the downlink channel of the common pilot signal in the service data demodulation of the UE which is independently scheduled. The first physical cell and the at least one second physical cell determined by the first physical cell use the same logical cell identity, and therefore the first physical cell and the at least one second physical cell transmit the same common pilot signal, for example, the common pilot signal may be a CRS. The independent scheduling UE may receive the common pilot signal sent by the at least one second physical cell, and if the UE is independently scheduled in the prior art to demodulate the service data received from the first physical cell based on the common pilot signal, a problem may occur that a channel experienced by the service data received by the independently scheduled UE is inconsistent with a channel experienced by the common pilot signal used for demodulation, so that the at least one second physical cell may generate interference to the demodulation of the service data of the independently scheduled UE.
Optionally, the method for the first physical cell to determine at least one second physical cell that interferes with service data demodulation of the independently scheduled UE includes:
the method comprises the steps that a first physical cell determines Reference Signal Received Power (RSRP) for receiving Sounding (Sounding) signals sent by UE (user equipment) through independent scheduling by the first physical cell, and RSRP for receiving the Sounding signals sent by the UE through each physical cell in all physical cells using the same logical cell identification with the first physical cell;
for example, as shown in a schematic diagram of a long Term Evolution (L ong Term Evolution, L TE) networking system shown in fig. 3, the physical cells perform interaction of data information and control information through an X2 interface.
The first physical cell may also obtain RSRP of each physical cell from an information pool, where information of the physical cells, including RSRP of the physical cells, is stored in the information pool. For example, as shown in fig. 4, in a schematic view of a Cloud radio access Network (Cloud-RAN) architecture, a baseband pool stores RSRPs of physical cells, and a first physical cell acquires RSRPs of each physical cell from the baseband pool.
The first physical cell respectively calculates the difference value of the RSRP of the first physical cell and the RSRP of each physical cell, and determines at least one physical cell corresponding to the difference value larger than or equal to a preset threshold value as at least one second physical cell.
The preset threshold may be set according to historical data or an empirical value, and is used to determine a physical cell in which the problem of inconsistency between a downlink channel of service data and a downlink channel of a common pilot signal exists in service data demodulation of an independently scheduled UE in all physical cells that jointly transmit the common pilot signal with the first physical cell.
It should be noted that, the method for determining, by the first physical cell, the at least one second physical cell that has the problem of inconsistency between the downlink channel of the service data and the downlink channel of the common pilot signal in the service data demodulation of the independently scheduled UE, in all physical cells that jointly transmit the common pilot signal with the first physical cell, is not limited to the above method, and other methods may also be used. For example, the first physical cell determines that each physical cell of all physical cells using the same logical cell identifier as the first physical cell receives an RSRP of a sounding signal sent by an independently scheduled UE, and the first physical cell determines at least one physical cell corresponding to an RSRP greater than a set threshold as at least one second physical cell. Or, the first physical cell directly determines all physical cells which jointly transmit the common pilot signal with the first physical cell as the at least one second physical cell.
S202, the first physical cell determines downlink channel information from the first physical cell to the independently scheduled UE and downlink channel information from each second physical cell in at least one second physical cell to the independently scheduled UE.
The downlink channel information comprises downlink channel large-scale fading and downlink channel small-scale fading, the downlink channel large-scale fading is mainly used for reflecting signal amplitude change of the downlink channel caused by path loss and shadow fading, and the downlink channel small-scale fading is mainly used for reflecting phase change of the downlink channel caused by multipath time delay. The downlink channel can be expressed as
Wherein the content of the first and second substances,
representing a downlink channel, L representing large-scale fading of the downlink channel, H representing small-scale fading of the downlink channel, and j representing an imaginary number, and representing the downlink channel as a synthetic form of the large-scale fading of the downlink channel and the small-scale fading of the downlink channel, which is mainly used for reflecting that the compensation of amplitude needs to be considered simultaneously when the compensation is carried out on the downlink channelCompensation for phase and compensation for phase. The Downlink Channel refers to a Channel from a signal of a Physical cell to an independently scheduled UE, for example, the Downlink signal may be a Physical Downlink Shared Channel (PDSCH).
Optionally, the method for the first physical cell to determine the downlink channel information of each second physical cell in the at least one second physical cell is as follows:
and the first physical cell acquires uplink channel information of each second physical cell.
For example, as shown in the L TE networking system schematic diagram shown in fig. 3, the physical cells perform interaction of data information and control information through an X2 interface.
The first physical cell may also obtain uplink channel information of each second physical cell from an information pool, where the information pool stores information of the physical cells, including the uplink channel information of the physical cells. For example, as shown in the Cloud-RAN architecture diagram in fig. 4, a baseband pool stores uplink channel information of physical cells, and a first physical cell acquires uplink channel information of each second physical cell from the baseband pool.
And after the first physical cell acquires the uplink channel information of each second physical cell, estimating and obtaining the downlink channel information of each second physical cell according to the uplink channel information of each second physical cell based on the reciprocity principle of the uplink and downlink channels.
Under the condition that the reciprocity principle of the uplink and downlink channels is established, the large-scale fading of the downlink channel can be estimated as the large-scale fading of the uplink channel, and the small-scale fading of the downlink channel can be estimated as the small-scale fading of the uplink channel.
S203, the first physical cell respectively determines the downlink channel compensation amount of each second physical cell according to the downlink channel information from the first physical cell to the independently scheduled UE and the downlink channel information from each second physical cell to the independently scheduled UE in the at least one second physical cell.
The first physical cell can respectively determine the downlink channel compensation amount of each second physical cell by the following formula one:
for any one second physical cell, in formula one, Δ represents the downlink channel compensation amount of the second physical cell, L1Indicating that the downlink channel information of the first physical cell includes large scale fading of the downlink channel, L2Indicating the downlink channel information of the second physical cell includes the large-scale fading of the downlink channel, H1Indicating that the downlink channel information of the first physical cell includes the small-scale fading, H, of the downlink channel2The downlink channel information indicating the second physical cell includes small-scale fading of the downlink channel ·HThe complex conjugate transpose operation of matrix calculation is shown, and (a ⊙ B) the dot product operation of matrix a and matrix B is shown.
It can be easily calculated, and certainly, the downlink channel compensation amount of the second physical cell can also be expressed as
(·)-1Representing a matrix inversion operation.
Downlink channel compensation amount for any one second physical cell
The derivation principle of (1) is as follows:
the process of jointly transmitting the common pilot signal by the first physical cell and any one of the second physical cells can be represented by the following formula two:
R＝(L1H1+L2H2)R0+Z1formula two
In the second formula, R represents the common pilot frequency received by the UE with independent schedulingSignal, L1And L2Respectively representing the large-scale fading of the downlink channel of the first physical cell and the large-scale fading of the downlink channel of the second physical cell, H1And H2Respectively representing the small-scale fading of the downlink channel of the first physical cell and the small-scale fading of the downlink channel of the second physical cell, R0Denotes a common pilot signal, Z, transmitted jointly by a first physical cell and a second physical cell1White noise representing the superposition of the common pilot signal.
With the prior art, the process of sending service data to the independently scheduled UE by the first physical cell can be represented by the following formula three:
Y＝L1H1S+Z0formula three
In formula three, Y represents the traffic data received by the independently scheduled UE, L1Indicating the large-scale fading of the downlink channel of the first physical cell, H1Indicating the small-scale fading of the downlink channel of the first physical cell, S indicating the service data sent by the first physical cell, Z0White noise representing the superposition of traffic data.
As can be seen from the formula two and the formula three, with the prior art, there is a problem that a channel experienced by the service data received by the independently scheduled UE is inconsistent with a channel experienced by the common pilot signal used for demodulation, and the demodulation capability of the independently scheduled UE is reduced.
In this embodiment, by increasing the downlink channel compensation amount Δ of the second physical cell when the first physical cell sends the service data to the independently scheduled UE, the equivalent channel experienced by the service data received by the independently scheduled UE is consistent with the channel experienced by the common pilot signal used for demodulation, thereby improving the demodulation capability of the independently scheduled UE.
After the downlink channel compensation amount delta of the second physical cell is increased when the first physical cell sends the service data to the independently scheduled UE, the process that the first physical cell sends the service data to the independently scheduled UE can be represented by the following formula four:
Y＝L1H1(I+Δ)S+Z0＝(L1H1+L2H2)S+Z0formula four
In the fourth formula, Y represents the traffic data received by the independently scheduled UE, L1Indicating the large-scale fading of the downlink channel of the first physical cell, H1The method comprises the steps of representing the small-scale fading of a downlink channel of a first physical cell, delta representing the compensation quantity of the downlink channel of a second physical cell, S representing service data sent by the first physical cell, and Z0White noise representing a superposition of traffic data, L2Indicating the large-scale fading, H, of the downlink channel of the second physical cell2Indicating the small-scale fading of the downlink channel of the second physical cell.
Solving by the formula four:
similarly, for any one second physical cell, the downlink channel compensation amount of the second physical cell can be expressed as
S204, the first physical cell compensates the downlink channel of the service data according to the downlink channel compensation amount of each second physical cell to obtain the downlink channel equivalent to the downlink channel of the common pilot signal.
The amount of downlink channel compensation in any known second physical cell can be expressed as
In the case of (1), the first physical cell may compensate the downlink channel of its own service data by using the following formula five, to obtain an equivalent downlink channel equivalent to the downlink channel of the common pilot signal:
A＝L1(I+Δ1+Δ2+...+Δn)H1formula five
In the fifth formula, A represents the equivalent downlink channel, I represents the identity matrix, and Δ1、Δ2、...、ΔnRespectively representing the downlink channel compensation amount of each second physical cell, n representing the number of physical cells in at least one second physical cell, L1Representing a first physical cellThe downlink channel information of the region includes large-scale fading of the downlink channel, H1The downlink channel information indicating the first physical cell includes a small-scale fading of the downlink channel.
S205, the first physical cell sends service data to the independent scheduling UE on the equivalent downlink channel.
After the downlink channel compensation amount delta of at least one second physical cell is added when the first physical cell sends the service data to the independently scheduled UE, the process that the first physical cell sends the service data to the independently scheduled UE can be represented by the following formula six:
Y＝AS+Z0＝L1(I+Δ1+Δ2+...+Δn)H1S+Z0formula six
In the sixth formula, Y represents when the first physical cell transmits the service data to the independently scheduled UE through the equivalent downlink channel H.
Illustrate by way of example
Suppose that: as shown in fig. 5, the ASFN system includes three physical cells, which are a physical cell 1, a physical cell 2, and a physical cell 3, respectively, where the physical cell 1, the physical cell 2, and the physical cell 3 use the same logical cell identifier, and the physical cell 1 provides service for independently scheduling UEs.
The physical cell 1 determines that the physical cells which cause the problem that the downlink channel of the service data is inconsistent with the downlink channel of the common pilot signal in the service data demodulation of the independently scheduled UE are a physical cell 2 and a physical cell 3. The physical cell 1 respectively determines the downlink channel information from the physical cell to the independently scheduled UE and comprises the small-scale fading H of the downlink channel1And large scale fading L of downlink channel1The downlink channel information from the physical cell 2 to the independently scheduled UE comprises the small-scale fading H of the downlink channel2And large scale fading L of downlink channel2And the downlink channel information from the physical cell 3 to the independently scheduled UE comprises the small-scale fading H of the downlink channel3And large scale fading L of downlink channel3. For example, the first physical cell may determine downlink channel information of the physical cell 2 to the independently scheduled UE and downlink channel information of the physical cell 3 to the independently scheduled UE, respectively, based on the principle of reciprocity between uplink and downlink channels.
In a service data sending method provided in the embodiment of the present invention, after determining, by a first physical cell, at least one second physical cell that causes a problem that a downlink channel of service data and a downlink channel of a common pilot signal are inconsistent in service data demodulation of an independent scheduling UE, the first physical cell determines, according to downlink channel information from the first physical cell to the independent scheduling UE and downlink channel information from each second physical cell to the independent scheduling UE, a downlink channel compensation amount of each second physical cell respectively; then the first physical cell compensates the downlink channel of the self service data according to the downlink channel compensation quantity of each second physical cell to obtain the downlink channel equivalent to the downlink channel of the common pilot signal; and finally, the first physical cell sends service data to the independent scheduling UE on the equivalent downlink channel. In the above technical solution, since the channel experienced by the downlink service data received by the independently scheduled UE is an equivalent downlink channel, the equivalent downlink channel is consistent with the downlink channel experienced by the common pilot signal used for demodulation, and the common pilot signal used for demodulation is jointly transmitted by the first physical cell and the at least one second physical cell that cause the problem that the downlink channel of the service data received by the independently scheduled UE is inconsistent with the downlink channel of the common pilot signal in the service data demodulation of the independently scheduled UE, the channel experienced by the downlink service data received by the independently scheduled UE is consistent with the channel experienced by the common pilot signal used for demodulation, thereby improving the demodulation capability of the independently scheduled UE.
It should be particularly noted that the technical solution provided in the embodiment of the present invention is not limited to be applied to the ASFN system, and may also be applied to other systems or scenarios.
For example, the technical scheme provided by the embodiment of the invention is applicable to a network architecture of a Single Frequency Network (SFN) + ASFN hybrid network. In a network architecture of the SFN + ASFN hybrid network, it is possible that a plurality of RRUs included in one physical cell form one cluster, the network may include a plurality of clusters, and space division multiplexing of users is implemented between the clusters. As shown in fig. 6, in a network architecture of an SFN + ASFN hybrid network, RRU1 and RRU2 included in a physical cell 1 form a first cluster, RRU3 and RRU4 included in a physical cell 2 form a second cluster, RRU in the first cluster provides service for independently scheduling UE1, RRU in the second cluster provides service for independently scheduling UE2, and RRU in the first cluster and RRU in the second cluster jointly provide service for jointly scheduling UE 3. At this time, the technical scheme provided by the embodiment of the invention can realize that the channel experienced by the downlink service data received by the independently scheduled UE is consistent with the channel experienced by the common pilot signal used for demodulation, thereby improving the demodulation capability of the independently scheduled UE.
For another example, the technical solution provided in this embodiment of the present invention is applicable to a scenario in which a coordinated transmission manner is adopted between physical cells in an L TE system, where in this scenario, based on a port power difference, a UE is divided into an edge UE and a center UE, and there is a problem that service data received by the edge UE is inconsistent with a channel experienced by a common pilot signal used for demodulation.
Example two
Fig. 7 is a first physical cell according to an embodiment of the present invention, where the first physical cell may adopt the method provided in the corresponding embodiment of fig. 2. The first physical cell 700 includes: a processing unit 701 and a transceiving unit 702.
A processing unit 701, configured to determine at least one second physical cell, where the at least one second physical cell includes a physical cell that causes inconsistency between a downlink channel of service data and a downlink channel of a common pilot signal in service data demodulation of an independent scheduling user equipment UE, a first physical cell is a physical cell that provides service for the independent scheduling UE, and the first physical cell and the at least one second physical cell use the same logical cell identifier;
determining downlink channel information from the UE to the independently scheduled UE and downlink channel information from each second physical cell to the independently scheduled UE in at least one second physical cell;
respectively determining the downlink channel compensation amount of each second physical cell according to the downlink channel information of the second physical cell and the downlink channel information of each second physical cell;
the cell compensates the downlink channel of the service data according to the downlink channel compensation quantity of each second physical cell to obtain a downlink channel equivalent to the downlink channel of the common pilot signal;
a transceiving unit 702, configured to send service data to the independently scheduled UE on the equivalent downlink channel determined by the processing unit 701.
Optionally, when the processing unit 701 determines at least one second physical cell, the processing unit is specifically configured to:
determining RSRP of a first physical cell for receiving a detection signal sent by UE (user equipment) in independent scheduling and RSRP of each physical cell in all physical cells using the same logical cell identifier with the first physical cell for receiving the detection signal sent by UE in independent scheduling;
and respectively calculating the difference value of the RSRP of the first physical cell and the RSRP of each physical cell, and determining at least one physical cell corresponding to the difference value which is greater than or equal to a preset threshold value as at least one second physical cell.
When the processing unit 701 determines the RSRP of the first physical cell and the RSRP of each physical cell by using the information received by the transceiver 702 when the transceiver 702 performs information interaction with other physical cells, etc., the specific content may refer to S201 shown in fig. 2, which is not described herein again.
Optionally, when determining downlink channel information from each second physical cell in the at least one second physical cell to the independently scheduled UE, the processing unit 701 is specifically configured to:
acquiring uplink channel information from the independently scheduled UE to each second physical cell;
and estimating and obtaining the downlink channel information of each second physical cell according to the uplink channel information from the independently scheduled UE to each second physical cell based on the reciprocity principle of the uplink and downlink channels.
Optionally, when determining the downlink channel compensation amount of each second physical cell according to the downlink channel information of the processing unit 701 and the downlink channel information of each second physical cell, the processing unit is specifically configured to:
by the formula
Determining the downlink channel compensation amount of each second physical cell respectively, wherein delta represents the downlink channel compensation amount of the second physical cell L1Indicating that the downlink channel information of the first physical cell includes large scale fading of the downlink channel, L2Indicating the downlink channel information of the second physical cell includes the large-scale fading of the downlink channel, H1Indicating that the downlink channel information of the first physical cell includes the small-scale fading, H, of the downlink channel2The downlink channel information indicating the second physical cell includes small-scale fading of the downlink channel ·HThe complex conjugate transpose operation of matrix calculation is shown, and (a ⊙ B) the dot product operation of matrix a and matrix B is shown.
Optionally, when the processing unit 701 compensates the downlink channel of the service data according to the downlink channel compensation amount of each second physical cell to obtain a downlink channel equivalent to the downlink channel of the common pilot signal, the processing unit is specifically configured to:
by formula A-L1(I+Δ1+Δ2+...+Δn)H1Compensating a downlink channel of self service data to obtain a downlink channel equivalent to the downlink channel of the common pilot signal, wherein A represents the equivalent downlink channel, I represents an identity matrix, and delta1、Δ2、...、ΔnRespectively representing the downlink channel compensation amount of each second physical cell, n representing the number of physical cells in at least one second physical cell, L1Indicating that the downlink channel information of the first physical cell includes large-scale fading, H, of the downlink channel1The downlink channel information indicating the first physical cell includes a small-scale fading of the downlink channel.
It should be noted that the division of the unit in the embodiment of the present invention is schematic, and is only a logic function division, and there may be another division manner in actual implementation. In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
Based on the above embodiments, an embodiment of the present invention further provides a first physical cell, where the first physical cell may adopt the method provided in the embodiment corresponding to fig. 2, and may be the same device as the first physical cell shown in fig. 7. Referring to fig. 8, the first physical cell 800 includes: a processor 801, a transmitter 802, a receiver 803, a bus 804, and a memory 805, wherein:
the processor 801, transmitter 802, receiver 803, and memory 805 are interconnected by a bus 804; the bus 804 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 8, but this is not intended to represent only one bus or type of bus.
The processor 801 in fig. 8 is used to implement the functions of the processing unit 701 in fig. 7, and the transmitter 802 and the receiver in fig. 8 are used to implement the functions of the transceiving unit 702 in fig. 7. The first physical cell 800 also comprises a memory 805 for storing programs and the like. In particular, the program may include program code comprising computer operating instructions. The memory 805 may include a Random Access Memory (RAM) and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory. The processor 801 executes the application program stored in the memory 805 to implement the service data transmission method as described above.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.
Claims (10)
1. A method for transmitting service data, comprising:
a first physical cell determines at least one second physical cell, wherein the at least one second physical cell comprises a physical cell which causes the problem that the downlink channel of service data exists in the service data demodulation of independent scheduling User Equipment (UE) and the downlink channel of a common pilot signal is inconsistent, the first physical cell is a physical cell which provides service for the independent scheduling UE, and the first physical cell and the at least one second physical cell use the same logical cell identifier;
the first physical cell determines downlink channel information from the first physical cell to the independently scheduled UE and downlink channel information from each second physical cell in the at least one second physical cell to the independently scheduled UE;
the first physical cell respectively determines the downlink channel compensation quantity of each second physical cell according to the downlink channel information of the first physical cell and the downlink channel information of each second physical cell;
the first physical cell compensates the downlink channel of the service data according to the downlink channel compensation amount of each second physical cell to obtain a downlink channel equivalent to the downlink channel of the common pilot signal;
and the first physical cell sends service data to the independent scheduling UE on the equivalent downlink channel.
2. The method of claim 1, wherein the first physical cell determines at least one second physical cell, comprising:
the first physical cell determines Reference Signal Received Power (RSRP) of a probe signal sent by the UE which is received by the first physical cell and RSRP of the probe signal sent by the UE which is received by each physical cell in all physical cells using the same logical cell identification with the first physical cell;
the first physical cell respectively calculates the difference value of the RSRP of the first physical cell and the RSRP of each physical cell, and determines at least one physical cell corresponding to the difference value larger than or equal to a preset threshold value as the at least one second physical cell.
3. The method of claim 1 or 2, wherein the determining, by the first physical cell, downlink channel information from each of the at least one second physical cell to the independently scheduled UE comprises:
the first physical cell acquires uplink channel information from the independently scheduled UE to each second physical cell;
and the first physical cell estimates and obtains the downlink channel information of each second physical cell according to the uplink channel information from the independently scheduled UE to each second physical cell based on the reciprocity principle of the uplink and downlink channels.
4. The method according to any one of claims 1 to 2, wherein the determining, by the first physical cell, the downlink channel compensation amount of each second physical cell according to the downlink channel information of the first physical cell and the downlink channel information of each second physical cell respectively comprises:
the first physical cell is passed through a formula
Determining downlink channel compensation amount of each second physical cell respectively, wherein delta represents the downlink channel compensation amount of the second physical cell L1Indicating that the downlink channel information of the first physical cell includes large-scale fading of the downlink channel, L2Indicating the downlink channel information of the second physical cell includes the downlink channel large-scale fading, H1Indicating that the downlink channel information of the first physical cell includes a small-scale fading, H, of the downlink channel2Represents the aboveThe downlink channel information of the second physical cell includes the small-scale fading of the downlink channel ·HThe complex conjugate transpose operation of matrix calculation is shown, and (a ⊙ B) represents dot multiplication of matrix a and matrix B.
5. The method of claim 4, wherein the first physical cell compensates the downlink channel of the self service data according to the downlink channel compensation amount of each second physical cell, and obtains the downlink channel equivalent to the downlink channel of the common pilot signal, and the method comprises:
the first physical cell is represented by formula a-L1(I+Δ1+Δ2+...+Δn)H1Compensating a downlink channel of self service data to obtain a downlink channel equivalent to the downlink channel of the common pilot signal, wherein A represents the equivalent downlink channel, I represents an identity matrix, and delta1、Δ2、...、ΔnRespectively representing the downlink channel compensation amount of each second physical cell, n representing the number of physical cells in the at least one second physical cell, L1Indicating that the downlink channel information of the first physical cell includes downlink channel large-scale fading, H1And indicating the small-scale fading of the downlink channel included in the downlink channel information of the first physical cell.
6. A first physical cell, comprising:
a processing unit, configured to determine at least one second physical cell, where the at least one second physical cell includes a physical cell that causes a problem of inconsistency between a downlink channel of service data and a downlink channel of a common pilot signal in service data demodulation of an independent scheduling User Equipment (UE), where a first physical cell is a physical cell that provides a service for the independent scheduling UE, and the first physical cell and the at least one second physical cell use a same logical cell identifier;
determining downlink channel information from the UE to the independent scheduling UE and downlink channel information from each second physical cell in the at least one second physical cell to the independent scheduling UE;
respectively determining the downlink channel compensation amount of each second physical cell according to the downlink channel information of the second physical cell and the downlink channel information of each second physical cell;
the cell compensates the downlink channel of the service data according to the downlink channel compensation quantity of each second physical cell to obtain a downlink channel equivalent to the downlink channel of the common pilot signal;
and the transceiving unit is used for sending service data to the independent scheduling UE on the equivalent downlink channel determined by the processing unit.
7. The first physical cell of claim 6, wherein the processing unit, when determining the at least one second physical cell, is specifically configured to:
determining Reference Signal Received Power (RSRP) of the first physical cell for receiving the probe signals sent by the independently scheduled UE, and RSRP of the probe signals sent by the independently scheduled UE received by each of all physical cells using the same logical cell identifier as the first physical cell;
and respectively calculating the difference value of the RSRP of the first physical cell and the RSRP of each physical cell, and determining at least one physical cell corresponding to the difference value which is greater than or equal to a preset threshold value as the at least one second physical cell.
8. The first physical cell according to claim 6 or 7, wherein, when determining the downlink channel information from each of the at least one second physical cell to the independently scheduled UE, the processing unit is specifically configured to:
acquiring uplink channel information from the independently scheduled UE to each second physical cell;
and estimating and obtaining the downlink channel information of each second physical cell according to the uplink channel information from the independently scheduled UE to each second physical cell based on the reciprocity principle of the uplink and downlink channels.
9. The first physical cell according to any one of claims 6 to 7, wherein the processing unit, when determining the downlink channel compensation amount of each second physical cell according to the downlink channel information of itself and the downlink channel information of each second physical cell, is specifically configured to:
by the formula
Determining downlink channel compensation amount of each second physical cell respectively, wherein delta represents the downlink channel compensation amount of the second physical cell L1Indicating that the downlink channel information of the first physical cell includes large-scale fading of the downlink channel, L2Indicating the downlink channel information of the second physical cell includes the downlink channel large-scale fading, H1Indicating that the downlink channel information of the first physical cell includes a small-scale fading, H, of the downlink channel2A downlink channel small-scale fading included in the downlink channel information indicating the second physical cell (·)HThe complex conjugate transpose operation of matrix calculation is shown, and (a ⊙ B) the dot product operation of matrix a and matrix B is shown.
10. The first physical cell according to claim 9, wherein the processing unit, when compensating the downlink channel of the service data according to the downlink channel compensation amount of each second physical cell to obtain a downlink channel equivalent to the downlink channel of the common pilot signal, is specifically configured to:
by formula A-L1(I+Δ1+Δ2+...+Δn)H1Compensating a downlink channel of self service data to obtain a downlink channel equivalent to the downlink channel of the common pilot signal, wherein A represents the equivalent downlink channel, I represents an identity matrix, and delta1、Δ2、...、ΔnRespectively represent the downlink channel compensation amount of each second physical cell,n represents the number of physical cells in the at least one second physical cell, L1Indicating that the downlink channel information of the first physical cell includes downlink channel large-scale fading, H1And indicating the small-scale fading of the downlink channel included in the downlink channel information of the first physical cell.
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