CN103875292B - A kind of cooperative scheduling method and the network equipment - Google Patents
A kind of cooperative scheduling method and the network equipment Download PDFInfo
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Abstract
The embodiment of the invention discloses a kind of cooperative scheduling method and the network equipment, emitting performance of the multiple cell not in the case of stringent synchronization can be lifted.Methods described is used for wireless communication system, and user terminal UE main serving cell and cooperation cell cooperate with the system provides communication service for the UE, and method includes：The network equipment obtains phase compensation amount of first signal relative to secondary signal, wherein described first signal is the Physical Downlink Shared Channel PDSCH signals that the cooperation cell is transmitted to the UE, and the secondary signal is the physical downlink control channel PDCCH signal that the main serving cell is transmitted to the UE；Then the network equipment controls the cooperation cell transmitting to carry out the first signal after phase precompensation according to the phase compensation amount, to cause the first signal after the phase precompensation and the secondary signal synchronous.The present invention is applied to the communications field.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a cooperative scheduling method and a network device.
Background
For a conventional wireless cellular network, a User at the edge of a serving cell is interfered by signals of multiple cells, so that channel conditions are relatively poor, and errors are inevitable due to relevant measurement parameters fed back by a User Equipment (UE), such as Reference Signal Receiving Power (RSRP) or Reference Signal Receiving Quality (RSRQ). Therefore, the system easily causes misjudgment when carrying out the mobility management of the UE and the cell switching judgment according to the relevant measurement parameters fed back by the UE, so that the edge user of the service cell switches back and forth between the service cell and the adjacent cell of the service cell, a ping-pong switching phenomenon is introduced, and the user experience is reduced.
On the other hand, with the increase of the current network access amount, the channel capacity of the cell may be saturated, which easily causes the situation that the cell service throughput cannot meet the user requirement, and further causes the user experience to be reduced.
In the prior art, when a problem of ping-pong handover that may occur in cell mobility management is solved or a problem that cell service throughput cannot meet a user requirement is solved, a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Shared Channel (PDSCH) transmission separation mode may be adopted in a multi-cell cooperation mode, that is, a main serving cell and a cooperation cell of a UE cooperate to provide a communication service for the UE, a PDCCH Channel is issued by the main serving cell, and a PDSCH Channel may adaptively select a cooperation cell with better Channel quality for transmission according to a state of a current Channel through cooperation between the multiple cells at a system side. From the standard protocol implementation flow, the method is completely feasible, but in practical use, a serious problem is faced: that is, no matter the main serving cell and the cooperating cell are two cells under different sites, or two cells under the same site, very precise signal synchronization cannot be achieved in practice. However, if two cells performing multi-cell cooperation cannot achieve very accurate signal synchronization, PDCCH signals and PDSCH signals transmitted by two cells adopting a PDCCH and PDSCH transmission separation mode cannot achieve accurate synchronization, and such a cooperative transmission mode may have significant performance loss, for example, Inter Symbol Interference (ISI) or channel estimation of terminal-specific pilot (DRS) may be seriously affected by Orthogonal Frequency Division Multiplexing (ofdm) of a main serving cell.
Disclosure of Invention
Embodiments of the present invention provide a cooperative scheduling method and a network device, which can improve the transmission performance under the condition of not strict synchronization of multiple cells.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect, a network device is provided for a wireless communication system, where a main serving cell and a cooperating cell of a user equipment UE cooperate to provide a communication service for the UE, and the network device includes an obtaining unit and a control unit;
the acquiring unit is configured to acquire a phase compensation amount of a first signal relative to a second signal, where the first signal is a PDSCH signal of a physical downlink shared channel transmitted by the cooperating cell to the UE, and the second signal is a PDCCH signal of a physical downlink control channel transmitted by the primary serving cell to the UE;
the control unit is configured to control the cooperative cell to transmit a first signal after phase pre-compensation according to the phase compensation amount acquired by the acquisition unit, so that the first signal after phase pre-compensation is synchronized with the second signal.
In a first possible implementation manner of the first aspect, with reference to the first aspect, the obtaining unit includes a first obtaining module and a determining module;
the first obtaining module is configured to obtain an uplink timing offset of the cooperative cell with respect to the primary serving cell;
the determining module is configured to determine a phase compensation amount of the first signal relative to the second signal according to the uplink timing offset acquired by the first acquiring module.
In a second possible implementation manner of the first aspect, with reference to the first possible implementation manner of the first aspect, the first obtaining module is specifically configured to:
acquiring uplink timing deviation of an uplink signal transmitted by the UE when the uplink signal is transmitted on the cooperative cell relative to the uplink signal when the uplink signal is transmitted on the main service cell according to a real-time measurement result; or,
and acquiring a preset uplink timing deviation of the cooperative cell relative to the main service cell.
In a third possible implementation manner of the first aspect, with reference to the second possible implementation manner of the first aspect, the first obtaining module is specifically configured to:
respectively acquiring a first time point and a second time point according to an uplink Sounding Reference Signal (SRS) transmitted by the UE, wherein the first time point is the time when the uplink SRS reaches the cooperative cell, and the second time point is the time when the uplink SRS reaches the main serving cell;
and calculating the uplink timing deviation according to the first time point and the second time point.
In a fourth possible implementation manner of the first aspect, with reference to the first possible implementation manner of the first aspect to the third possible implementation manner of the first aspect, the determining module is specifically configured to:
determining the result obtained by inverting the uplink timing deviation as the phase compensation quantity; or,
and determining the result of adding a preset first margin value after the uplink timing deviation is inverted as the phase compensation quantity.
In a fifth possible implementation manner of the first aspect, with reference to the first aspect to the fourth possible implementation manner of the first aspect, the control unit includes a second obtaining module and a sending module;
the second obtaining module is configured to obtain a first signal after performing phase pre-compensation according to the phase compensation amount;
the sending module is configured to send the phase pre-compensated first signal obtained by the second obtaining module to the cooperative cell, and the cooperative cell sends the phase pre-compensated first signal.
In a sixth possible implementation manner of the first aspect, with reference to the first aspect to the fourth possible implementation manner of the first aspect, the control unit includes a sending module;
the sending module is configured to send the phase compensation amount to the cooperative cell, and the cooperative cell obtains a first signal after phase pre-compensation according to the phase compensation amount and sends the first signal after phase pre-compensation.
In a seventh possible implementation manner of the first aspect, with reference to the first aspect to the sixth possible implementation manner of the first aspect, the control unit is specifically configured to:
controlling the cooperative cell to transmit a first signal after phase precompensation according to the phase compensation quantity acquired by the acquisition unit and in combination with a first formula,the first formula is:
wherein x (k) is a corresponding signal on a kth frequency domain carrier wave transmitted by the cooperative cell; x (k),the method comprises the steps of carrying out phase pre-compensation on a corresponding signal on a kth frequency domain carrier, obtaining a first signal, delta is a phase compensation amount, pi and k are constants, and N is a Fourier transform length.
In a second aspect, a coordinated scheduling method is provided, where the method is used in a wireless communication system, and a main serving cell and a coordinated cell of a user equipment UE cooperatively provide a communication service for the UE in the system, and the method includes:
the method comprises the steps that network equipment obtains phase compensation quantity of a first signal relative to a second signal, wherein the first signal is a Physical Downlink Shared Channel (PDSCH) signal transmitted to the UE by the cooperative cell, and the second signal is a Physical Downlink Control Channel (PDCCH) signal transmitted to the UE by the main serving cell;
and the network equipment controls the cooperative cell to transmit the first signal after phase precompensation according to the phase compensation quantity so as to synchronize the first signal after phase precompensation with the second signal.
In a first possible implementation manner of the second aspect, with reference to the second aspect, the acquiring, by the network device, a phase compensation amount of the first signal relative to the second signal includes:
the network equipment acquires the uplink timing deviation of the cooperative cell relative to the main service cell;
and the network equipment determines the phase compensation quantity of the first signal relative to the second signal according to the uplink timing deviation.
In a second possible implementation manner of the second aspect, with reference to the first possible implementation manner of the second aspect, the acquiring, by the network device, the uplink timing offset of the cooperative cell relative to the primary serving cell includes:
the network equipment acquires uplink timing deviation of an uplink signal transmitted by the UE when the uplink signal is transmitted on the cooperative cell relative to the uplink signal transmitted on the main service cell according to a real-time measurement result; or,
and the network equipment acquires the preset uplink timing deviation of the cooperative cell relative to the main service cell.
In a third possible implementation manner of the second aspect, with reference to the second possible implementation manner of the second aspect, the acquiring, by the network device, an uplink timing deviation, when the uplink signal transmitted by the UE is transmitted on the cooperative cell and is transmitted on the primary serving cell, according to a real-time measurement result includes:
the network equipment respectively acquires a first time point and a second time point according to an uplink Sounding Reference Signal (SRS) transmitted by the UE, wherein the first time point is the time when the uplink SRS reaches the cooperative cell, and the second time point is the time when the uplink SRS reaches the main serving cell;
and the network equipment calculates the uplink timing deviation according to the first time point and the second time point.
In a fourth possible implementation manner of the second aspect, with reference to the first possible implementation manner of the second aspect to the third possible implementation manner of the second aspect, the determining, by the network device, a phase compensation amount of the first signal relative to the second signal according to the uplink timing offset includes:
the network equipment determines the result obtained by negating the uplink timing deviation as the phase compensation quantity; or,
and the network equipment determines the result of adding a preset first margin value after negating the uplink timing deviation as the phase compensation quantity.
In a fifth possible implementation manner of the second aspect, with reference to the second aspect to the fourth possible implementation manner of the second aspect, the controlling, by the network device, the cooperative cell to transmit the first signal after the phase pre-compensation is performed according to the phase compensation amount specifically includes:
the network equipment acquires a first signal after phase precompensation according to the phase compensation quantity;
and the network equipment sends the first signal after the phase precompensation to the cooperative cell, and the cooperative cell transmits the first signal after the phase precompensation.
In a sixth possible implementation manner of the second aspect, with reference to the second aspect to the fourth possible implementation manner of the second aspect, the controlling, by the network device, the cooperative cell to transmit the first signal after the phase pre-compensation is performed according to the phase compensation amount specifically includes:
and the network equipment sends the phase compensation amount to the cooperative cell, the cooperative cell acquires a first signal subjected to phase pre-compensation according to the phase compensation amount, and sends the first signal subjected to phase pre-compensation.
In a seventh possible implementation manner of the second aspect, with reference to the second aspect to the sixth possible implementation manner of the second aspect, the performing phase pre-compensation according to the phase compensation amount includes:
according to the phase compensation quantity, combining a first formula to perform phase pre-compensation on the first signal, wherein the first formula is as follows:
wherein x (k) is a corresponding signal on a kth frequency domain carrier wave transmitted by the cooperative cell; x (k),the first signal after the phase pre-compensation is carried out on the corresponding signal on the kth frequency domain carrier △ is the phase compensation quantity, pi and k are constants, and N is a FourierThe length of the interior transform.
In a third aspect, a network device is provided for a wireless communication system, where a main serving cell and a cooperating cell of a user equipment UE cooperatively provide communication services for the UE, the network device includes a processor and a memory, the memory is in communication with the processor, the memory stores program codes therein, and the processor is configured to invoke the program codes stored in the memory and perform the method according to any one of the second aspects.
The embodiment of the invention provides a cooperative scheduling method and network equipment, which are used for a wireless communication system, wherein a main service cell and a cooperative cell of UE (user equipment) in the system cooperate to provide communication service for the UE, and the method comprises the following steps: the network equipment acquires a phase compensation amount of a first signal relative to a second signal, wherein the first signal is a PDSCH signal transmitted to the UE by the cooperative cell, and the second signal is a PDCCH signal transmitted to the UE by the main serving cell; and then the network equipment controls the cooperative cell to transmit the first signal after phase precompensation according to the phase compensation quantity, so that the first signal after phase precompensation is synchronous with the second signal. In this way, the phase pre-compensated first signal is shifted in multipath of the delay profile by the same degree as the phase compensation amount relative to the first signal, so that the first signal and the second signal can be synchronized during cooperative scheduling, and the situation that the time when the first signal reaches the UE is not synchronized with the time when the second signal reaches the UE in the prior art can be avoided, thereby improving the transmission performance under the condition of not strict synchronization among multiple cells.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a method for cooperative scheduling according to an embodiment of the present invention;
fig. 2 is a diagram illustrating a scenario in which a time when a first signal arrives at a UE lags a time when a second signal arrives at the UE according to an embodiment of the present invention;
fig. 3 is a diagram illustrating a scenario in which a time when a first signal arrives at a UE is earlier than a time when a second signal arrives at the UE according to an embodiment of the present invention;
fig. 4 is a cooperative scheduling method according to a second embodiment of the present invention;
fig. 5 is a scene diagram of PDCCH and PDSCH transmission separation according to the second embodiment of the present invention;
fig. 6 is a first schematic structural diagram of a network device according to a third embodiment of the present invention;
fig. 7 is a schematic structural diagram of a network device according to a third embodiment of the present invention;
fig. 8 is a third schematic structural diagram of a network device according to a third embodiment of the present invention;
fig. 9 is a schematic structural diagram of a network device according to a third embodiment of the present invention;
fig. 10 is a schematic structural diagram of a network device according to a fourth 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 embodiments described below 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 first embodiment,
An embodiment of the present invention provides a cooperative scheduling method, where the method is used in a wireless communication system, and a main serving cell and a cooperative cell of a UE in the system cooperate to provide services for the UE, specifically as shown in fig. 1, the method may specifically include:
101. the network equipment acquires a phase compensation amount of a first signal relative to a second signal, wherein the first signal is a PDSCH signal transmitted to the UE by the cooperative cell, and the second signal is a PDCCH signal transmitted to the UE by the main serving cell.
Specifically, in the cooperative scheduling method provided by the embodiment of the present invention, a PDCCH and PDSCH transmission separation manner is adopted to perform cooperative scheduling between multiple cells. The network equipment determines that the UE is allocated with a PDSCH in the cooperative cell and is allocated with a PDCCH in the main serving cell, and PDSCH signals transmitted to the UE by the cooperative cell are regarded as first signals; the PDCCH signal transmitted by the primary serving cell to the UE is considered as a second signal.
It should be noted that the primary serving cell and the cooperative cell may be managed by the same base station, and the network device is located in the base station; the main serving cell and the cooperative cell may also be managed by different base stations, and the network device is a network device in a higher layer than the base station of the main serving cell and the base station of the cooperative cell.
However, the PDCCH and PDSCH transmission separation method easily causes that 2 cells in cooperation cannot achieve accurate signal synchronization, and specifically, the following two situations occur:
1) in case one, the time at which the first signal arrives at the UE lags the time at which the second signal arrives at the UE:
as shown in fig. 2, in a normal procedure, the UE performs synchronization tracking on signals based on a Cell-specific reference Signal (CRS) of the primary serving Cell, searches for a first path position of the first Signal as a timing synchronization point, and may advance several sampling points based on the first path position as the timing synchronization point of the UE to improve robustness.
After synchronization, the UE performs OFDM signal reception processing according to the new timing synchronization point, and before performing time-frequency conversion, the UE performs a Cyclic Prefix (CP) removal operation. As can be seen from fig. 2, under the protection of the CP, advancing several sampling points as timing synchronization points of the UE does not affect the acquisition of the complete OFDM signal.
In this case, although the time at which the first signal arrives at the UE lags the time at which the second signal arrives at the UE, if the lag value does not exceed the CP, the UE does not significantly affect the signal reception processing.
It should be noted that the CRS is a cell common pilot, and both a specific sequence of the CRS and an occupied time-frequency position are related to the physical cell ID. The UE performs related work such as downlink channel estimation, synchronous tracking, downlink measurement and the like based on the CRS. For The third Generation Partnership Project Release (3 GPP R) 8 or 3GPP R9 or 3GPP R10 protocols, downlink PDCCH signaling is related to channel estimation and demodulation decoding by CRS.
2) Case two, the time at which the first signal arrives at the UE is earlier than the time at which the second signal arrives at the UE:
as shown in fig. 3, in the normal procedure, the UE performs synchronization tracking on the signals based on the CRS of the primary serving cell, and searches the first path position of the first signal as a synchronization point.
After synchronization, the UE performs reception processing on the OFDM signal according to the new timing synchronization point, and before time-frequency conversion, the UE performs CP removal operation, as can be seen from fig. 3, in this scenario, the UE has incomplete reception on the first signal and introduces OFMD ISI.
In summary, when performing cooperative scheduling transmission, performance loss may be caused by the asynchronous signals of the cooperative cell of the UE and the primary serving cell. In particular, in the scenario of the second case, the performance loss is more serious.
In addition, considering that in the multi-cell cooperative scheduling, in order to achieve transparency to the transmission weight and power information of the UE, the DRS needs to be used for channel estimation. In order to improve the channel estimation result, DRS channel estimation usually uses wiener filtering to improve the performance. In the wiener filtering method, the wiener filter coefficients of the frequency domain are usually generated based on a prior model. When the non-purpose-built UE carries out calculation based on the wiener filter coefficient of the prior model, the timing deviation problem of the UE can be considered during modeling. Generally following conventional timing tracking procedures, the timing offset is generally limited to within a few samples (on the order of tens of nanoseconds), but is generated in at least one of the following cases, for example: obvious timing deviation may still exist when a Global Positioning System (GPS) is sampled for synchronous transmission between base stations; timing deviation caused by different air interface distances between a base station of a cooperative cell of the UE and a base station of a main service cell of the UE relative to the UE (according to the transmission speed of electromagnetic waves, 3.3ns transmission delay exists in 1 m, and if the air interface distances are different by 50 m, 165ns difference is meant); due to transmission delay deviation caused by non-ideal components, the timing deviation between the time when the first signal reaches the UE and the time when the second signal reaches the UE may far exceed tens of nanoseconds, which may cause the DRS channel estimation prior model to be mismatched with the real signal, thereby seriously affecting the performance of DRS channel estimation.
It should be noted that DRS is a demodulation pilot dedicated to a user, and may directly carry a downlink precoding/Beamforming (Beamforming) weight, and may also directly carry power information. Therefore, the DRS is used for channel estimation to obtain equivalent weighted channel information, which also means that the system side can realize transparency of the transmission weight and power information of the UE.
Therefore, in the embodiment of the present invention, the network device obtains the phase compensation amount of the first signal relative to the second signal, and the phase compensation amount may enable the first signal and the second signal after phase pre-compensation to be synchronized during cooperative scheduling.
Specifically, the phase compensation amount may be obtained as follows:
after acquiring an uplink timing offset of the cooperative cell with respect to the main serving cell, the network device determines a phase compensation amount of the first signal with respect to the second signal according to the uplink timing offset, where the uplink timing offset may be preset in the network device or acquired according to a real-time measurement result, and this is not limited in this embodiment of the present invention.
102. And the network equipment controls the cooperative cell to transmit the first signal after the phase precompensation according to the phase compensation quantity so as to synchronize the first signal after the phase precompensation with the second signal.
Specifically, after the network device obtains the phase compensation amount of the first signal relative to the second signal, the network device controls the cooperative cell to transmit the first signal after the phase pre-compensation is performed according to the phase compensation amount.
Specifically, the embodiment of the present invention provides the following two methods for controlling, by a network device, the cooperative cell to transmit the phase pre-compensated first signal:
in the first mode, after acquiring the phase compensation amount, the network device directly performs phase pre-compensation on the first signal according to the phase compensation amount to obtain a first signal after the phase pre-compensation, and then sends the first signal after the phase pre-compensation to the cooperative cell, and the cooperative cell transmits the first signal after the phase pre-compensation;
and secondly, the network equipment sends the acquired phase compensation amount to the cooperative cell, and the cooperative cell performs phase pre-compensation on the first signal according to the phase compensation amount, acquires the first signal subjected to the phase pre-compensation and then transmits the first signal subjected to the phase pre-compensation.
The embodiment of the present invention does not specifically limit the way in which the network device controls the cooperative cell to transmit the phase pre-compensated first signal.
Specifically, the method for the network device or the cooperative cell to perform phase pre-compensation on the first signal according to the phase compensation amount may be as follows:
and according to the phase compensation quantity, combining a formula (1) to perform phase pre-compensation on the first signal.
Formula (1)
Wherein x (k) is a corresponding signal on a kth frequency domain carrier wave transmitted by the cooperative cell; x (k),in order to obtain a first signal after performing phase pre-compensation on a corresponding signal on the kth frequency domain carrier, △ is a phase compensation amount, pi and k are constants, and N is a fourier transform length, which is determined according to a bandwidth of the cooperative cell, for example, if the bandwidth is 20M, N may be 2048, and if the bandwidth is 10M, N may be 1024.
And substituting the first signal and the phase compensation quantity into a formula (1) to obtain a first signal after phase pre-compensation.
The embodiment of the invention provides a cooperative scheduling method, which is used for a wireless communication system, wherein a main service cell and a cooperative cell of UE (user equipment) in the system cooperate to provide communication service for the UE, and the method comprises the following steps: the network equipment acquires a phase compensation amount of a first signal relative to a second signal, wherein the first signal is a PDSCH signal transmitted to the UE by the cooperative cell, and the second signal is a PDCCH signal transmitted to the UE by the main serving cell; and then the network equipment controls the cooperative cell to transmit the first signal after the phase precompensation is carried out according to the phase compensation quantity. In this way, the phase pre-compensated first signal is shifted in multipath of the delay profile by the same degree as the phase compensation amount with respect to the first signal, so that the first signal and the second signal can be synchronized during cooperative scheduling, and the situation that the time when the first signal reaches the UE is not synchronized with the time when the second signal reaches the UE in the prior art can be avoided, thereby improving the transmission performance under the condition of not strict synchronization of multiple cells.
Example II,
An embodiment of the present invention provides a coordinated scheduling method, where the method is used in a wireless communication system, and a main serving cell and a coordinated cell of a UE in the system cooperate to provide services for the UE, and the embodiment of the present invention is described with reference to a technology of transmitting and separating a PDSCH and a PDCCH, and specifically, as shown in fig. 4, the method includes:
401. the network equipment determines that the UE is allocated with the PDSCH in the cooperative cell and the PDCCH in the main serving cell.
Specifically, in the prior art, in order to solve the problem of ping-pong handover that may occur in cell mobility management or the problem that cell service throughput cannot meet user requirements, a PDCCH and PDSCH transmission separation mode may be adopted in a multi-cell cooperation mode, and for completeness of implementation of the scheme, in the embodiment of the present invention, the following conditions are first given for a network device to determine cooperative scheduling for a UE:
a. the system side identifies the user capability, and identifies the protocol version and the Multiple Input Multiple Output (MIMO) capability supported by the UE.
For example, the protocol versions supported by the UE may be CRS based Transmission Mode (TM) 2, TM3, TM4, TM5, TM 6; or the protocol version supported by the UE may be DRS based TM7, 8, 9, 10; here, only some types of protocol versions supported by the UE are exemplarily listed, and which protocol version is specifically supported by the UE is not particularly limited.
Wherein TM7 is an R8 protocol characteristic, TM8 is an R9 protocol characteristic, TM9 is an R10 protocol characteristic, and TM10 is an R11 post-protocol characteristic.
b. The base station of each serving cell receives related measurement parameters fed back by the UE, for example, measurement results such as RSRP and RSRQ of the serving cell and neighboring cells, and receives Channel Quality Indicator (CQI) measurement information of each serving cell.
c. And the system side judges whether the UE is positioned at the edge of the serving cell according to the relevant measurement parameters fed back by the UE and the received CQI of each serving cell.
For example, whether the UE is at the cell edge may be determined according to reference signal received power RSRP. For example, if RSRP of the serving cell < RSRP of the neighboring cell, it may be determined that the UE is at the edge of the serving cell.
d. If the cell service throughput performance cannot meet the requirement or the ping-pong switching phenomenon frequently occurs in a short time, the network equipment determines to perform cooperative scheduling and transmission on the UE by the edge UE with the DRS.
Further, after the network device determines to perform cooperative scheduling on the UE, a specific procedure for separating PDCCH and PDSCH transmission for the UE may be briefly described as follows:
firstly, during cooperative scheduling, for an R8 edge user, switching the R8 edge user to a TM7 mode through high-layer signaling; for R9 edge users, switching the R9 edge users to a TM8 mode through high-layer signaling; for R10 edge users, it is switched to TM9 mode by higher layer signaling, and for R11 edge users, it is switched to TM10 mode by higher layer signaling.
Next, as shown in fig. 5, the network device determines that the UE is allocated a PDSCH in the cooperating cell and a PDCCH in the primary serving cell.
It should be noted that, the PDSCH is allocated to the UE by the cooperative cell of the UE, and the PDCCH is allocated to the UE by the main serving cell of the UE, because the signaling packet is transmitted by the main serving cell (i.e., the serving cell) so that the entire cooperative scheduling process does not feel handover, and the transmission of the data packet by the cooperative cell (i.e., the neighboring cell) can reduce the channel load of the main serving cell, so that the user can obtain better service quality without feeling handover, improve user experience, and avoid frequent ping-pong handover.
It should be noted that fig. 5 is a scene diagram for exemplarily providing a PDCCH and PDSCH transmission separation, where the primary serving cell and the cooperating cell are managed by different base stations, and the network device is a network device on a higher level than the base station of the primary serving cell and the base station of the cooperating cell, but as described in step 101, the primary serving cell and the cooperating cell may also be managed by the same base station, which is not specifically limited in the embodiment of the present invention.
402. And the network equipment acquires the uplink timing deviation of the cooperative cell relative to the main service cell.
Specifically, the network device may obtain the uplink timing offset in the following manner:
the network device may obtain the preset uplink timing offset, where the uplink timing offset of the serving cell of the UE with respect to the main serving cell is stored in advance.
It should be noted that the uplink timing offset is prior information of a coordinated cell for the UE, is applicable to all UEs accessing the coordinated cell, and may be obtained by performing statistical determination after measuring uplink timing offsets of the coordinated cell and the serving cell in real time for multiple times, which is not specifically limited in the embodiment of the present invention.
Optionally, the network device may obtain the uplink timing offset by:
and the network equipment acquires the uplink timing deviation of the uplink signal transmitted by the UE when the uplink signal is transmitted on the cooperative cell relative to the uplink signal transmitted on the main service cell according to the real-time measurement result.
Here, a method for acquiring, by the network device, an uplink timing offset when an uplink signal transmitted by the UE is transmitted on the cooperative cell relative to when the uplink signal is transmitted on the primary serving cell according to a real-time measurement result is as follows:
firstly, the network device respectively obtains a first time point and a second time point according to a pilot frequency of an uplink Sounding signal (SRS) transmitted by the UE, where the first time point is a time when the uplink SRS reaches the cooperative cell, and the second time point is a time when the uplink SRS reaches the main serving cell.
It should be noted that the pilot of the uplink SRS is mainly used for measuring and estimating the uplink channel quality, and calculating a Signal to Interference plus Noise Ratio (SINR) of the uplink channel, and is specifically used for supporting uplink scheduling of the UE. The first time point and the second time point can be measured by the uplink SRS pilot.
Then, the network device calculates the uplink timing offset according to the first time point and the second time point. That is, the difference between the first time point and the second time point may be specifically made, so as to obtain the uplink timing offset, that is, the uplink timing offset is obtained
Uplink timing offset = first time point-second time point formula (2)
As can be seen from equation (2), the uplink timing deviation may be a positive value or a negative value, which is not specifically limited in this embodiment of the present invention.
403. And the network equipment determines the phase compensation quantity of the first signal relative to the second signal according to the uplink timing deviation.
The first signal is a PDSCH signal transmitted by the cooperating cell to the UE, and the second signal is a PDCCH signal transmitted by the primary serving cell to the UE.
Specifically, the embodiment of the present invention may estimate the phase compensation amount according to the uplink timing offset. For example, the result of inverting the uplink timing deviation may be determined as a phase compensation amount; or, as can be seen from the analysis of the first case in the embodiment shown in fig. 1, in the cooperative scheduling, if the time when the first signal arrives at the UE lags behind the time when the second signal arrives at the UE, the acquisition of the complete OFDM signal is not affected if the lag value does not exceed the CP. Therefore, in order to ensure that the uplink timing offset is in the scenario described in the first case as much as possible during cooperative scheduling, after the uplink timing offset is obtained, a result obtained by adding a preset first margin value to the uplink timing offset after the uplink timing offset is inverted is determined as a phase compensation amount, where the first margin value may be a positive number or a negative number.
404. And the network equipment controls the cooperative cell to transmit the first signal after the phase precompensation according to the phase compensation quantity so as to synchronize the first signal after the phase precompensation with the second signal.
Specifically, after the network device obtains the phase compensation amount of the first signal relative to the second signal, the network device controls the cooperative cell to transmit the first signal after the phase pre-compensation is performed according to the phase compensation amount.
Specifically, the method for controlling the cooperative cell to transmit the phase pre-compensated first signal by the network device may refer to the description of step 102 in the embodiment shown in fig. 1, and the embodiment of the present invention is not described herein again.
Specifically, the method for performing phase pre-compensation on the first signal by the network device or the cooperative cell of the UE may refer to the description of step 102 in the embodiment shown in fig. 1, and the embodiment of the present invention is not described herein again.
The embodiment of the invention provides a cooperative scheduling method, which is used for a wireless communication system, wherein a main service cell and a cooperative cell of UE (user equipment) in the system cooperate to provide communication service for the UE, and the method comprises the following steps: the network equipment acquires a phase compensation amount of a first signal relative to a second signal, wherein the first signal is a PDSCH signal transmitted to the UE by the cooperative cell, and the second signal is a PDCCH signal transmitted to the UE by the main serving cell; and then the network equipment controls the cooperative cell to transmit the first signal after the phase precompensation is carried out according to the phase compensation quantity. In this way, the phase pre-compensated first signal is shifted in multipath of the delay profile by the same degree as the phase compensation amount with respect to the first signal, so that the first signal and the second signal can be synchronized during cooperative scheduling, and the situation that the time when the first signal reaches the UE is not synchronized with the time when the second signal reaches the UE in the prior art can be avoided, thereby improving the transmission performance under the condition of not strict synchronization of multiple cells.
Example III,
An embodiment of the present invention provides a network device 600, which is used in a wireless communication system, where a main serving cell and a cooperating cell of a user equipment UE cooperate to provide a communication service for the UE, and the network device 600 in this embodiment can be used to perform corresponding operations in the foregoing method embodiment, specifically, as shown in fig. 6, the network device 600 includes an obtaining unit 601 and a control unit 602.
The obtaining unit 601 is configured to obtain a phase compensation amount of a first signal relative to a second signal, where the first signal is a PDSCH signal of a physical downlink shared channel transmitted by the cooperating cell to the UE, and the second signal is a PDCCH signal of a physical downlink control channel transmitted by the primary serving cell to the UE.
The control unit 602 is configured to control the cooperative cell to transmit the first signal after phase pre-compensation according to the phase compensation amount acquired by the acquisition unit 601, so that the first signal after phase pre-compensation is synchronized with the second signal.
Further, as shown in fig. 7, the acquiring unit 601 specifically includes a first acquiring module 6011 and a determining module 6012.
The first obtaining module 6011 is configured to obtain an uplink timing offset of the cooperative cell with respect to the main serving cell.
The determining module 6012 is configured to determine a phase compensation amount of the first signal with respect to the second signal according to the uplink timing offset acquired by the first acquiring module 6011.
Further, the first obtaining module 6011 is specifically configured to obtain the uplink timing offset of the cooperative cell with respect to the main serving cell as follows:
acquiring uplink timing deviation of an uplink signal transmitted by the UE when the uplink signal is transmitted on the cooperative cell relative to the uplink signal when the uplink signal is transmitted on the main service cell according to a real-time measurement result; or,
and acquiring a preset uplink timing deviation of the cooperative cell relative to the main service cell.
Further, the obtaining, by the first obtaining module 6011, the uplink timing deviation of the uplink signal transmitted by the UE when the uplink signal is transmitted in the cooperative cell with respect to the transmission in the main serving cell according to the real-time measurement result specifically includes:
respectively acquiring a first time point and a second time point according to an uplink Sounding Reference Signal (SRS) transmitted by the UE, wherein the first time point is the time when the uplink SRS reaches the cooperative cell, and the second time point is the time when the uplink SRS reaches the main serving cell;
and calculating the uplink timing deviation according to the first time point and the second time point.
Further, the determining module 6012 is specifically configured to determine a phase compensation amount of the first signal relative to the second signal according to the uplink timing offset acquired by the first acquiring module 6011 as follows:
determining the result obtained by inverting the uplink timing deviation as the phase compensation quantity; or,
and determining the result of adding a preset first margin value after the uplink timing deviation is inverted as the phase compensation quantity.
Further, the control unit 602 may control the cooperative cell to transmit the first signal after performing phase pre-compensation according to the phase compensation amount acquired by the acquisition unit 601 as follows:
in one possible implementation, as shown in fig. 8, the control unit 602 includes a second obtaining module 6021 and a sending module 6022.
The second obtaining module 6021 is configured to obtain the first signal after the phase pre-compensation is performed according to the phase compensation amount.
The sending module 6022 is configured to send the phase pre-compensated first signal obtained by the second obtaining module 6021 to the cooperative cell, and the cooperative cell sends the phase pre-compensated first signal.
In another possible implementation manner, as shown in fig. 9, the control unit 602 specifically includes a sending module 6022.
The sending module 6022 is configured to send the phase compensation amount to the cooperative cell, and the cooperative cell acquires a first signal after phase pre-compensation according to the phase compensation amount and sends the first signal after phase pre-compensation.
Further, the control unit 602 is specifically configured to:
controlling the cooperative cell to transmit a first signal after performing phase pre-compensation according to the phase compensation amount obtained by the obtaining unit 601, and combining a first formula, where the first formula is:
wherein x (k) is a corresponding signal on a kth frequency domain carrier wave transmitted by the cooperative cell; x (k),the method comprises the steps of carrying out phase pre-compensation on a corresponding signal on a kth frequency domain carrier, obtaining a first signal, delta is a phase compensation amount, pi and k are constants, and N is a Fourier transform length.
Specifically, the description of the first embodiment or the second embodiment may be referred to for a method for performing cooperative scheduling by the network device 600, and details of this embodiment of the present invention are not repeated.
The embodiment of the invention provides network equipment which is used for a wireless communication system, wherein a main service cell and a cooperative cell of UE (user equipment) in the system cooperate to provide communication service for the UE, and the network equipment comprises an acquisition unit, a transmission unit and a transmission unit, wherein the acquisition unit acquires phase compensation quantity of a first signal relative to a second signal, the first signal is a Physical Downlink Shared Channel (PDSCH) signal which is transmitted to the UE by the cooperative cell, and the second signal is a Physical Downlink Control Channel (PDCCH) signal which is transmitted to the UE by the main service cell; the control unit controls the cooperative cell to transmit a first signal after phase precompensation according to the phase compensation quantity acquired by the acquisition unit so as to synchronize the first signal after phase precompensation with the second signal. In this way, the control unit controls the phase pre-compensated first signal transmitted by the cooperative cell to perform an offset on the multipath of the delay profile, which is equal to the phase compensation amount, with respect to the first signal, so that the first signal and the second signal can be synchronized during cooperative scheduling, and further, the occurrence of the situation that the time when the first signal reaches the UE is not synchronized with the time when the second signal reaches the UE in the prior art can be avoided, thereby improving the transmission performance under the condition of not strict synchronization among multiple cells.
Example four,
An embodiment of the present invention provides a network device 1000, which is used in a wireless communication system, where a main serving cell and a cooperating cell of a UE cooperatively provide a communication service for the UE, and the network device 1000 in this embodiment can be used to perform corresponding operations in the foregoing method embodiment, specifically, as shown in fig. 10, the network device 1000 includes a processor 1001 and a memory 1002, the memory 1002 is in communication with the processor 1001, the memory 1002 stores a program code, and the processor 1001 is configured to call the program code stored in the memory 1002, and perform the following operations:
and acquiring a phase compensation quantity of a first signal relative to a second signal, wherein the first signal is a Physical Downlink Shared Channel (PDSCH) signal transmitted to the UE by the cooperative cell, and the second signal is a Physical Downlink Control Channel (PDCCH) signal transmitted to the UE by the main serving cell.
And controlling the cooperative cell to transmit a first signal subjected to phase pre-compensation according to the phase compensation amount so as to synchronize the first signal subjected to phase pre-compensation with the second signal.
Specifically, the obtaining of the phase compensation of the first signal relative to the second signal may include:
acquiring uplink timing deviation of the cooperative cell relative to the main service cell;
and determining the phase compensation quantity of the first signal relative to the second signal according to the uplink timing deviation.
Specifically, the obtaining of the uplink timing offset of the cooperative cell relative to the main serving cell may include:
acquiring uplink timing deviation of an uplink signal transmitted by the UE when the uplink signal is transmitted on the cooperative cell relative to the uplink signal when the uplink signal is transmitted on the main service cell according to a real-time measurement result; or,
and acquiring a preset uplink timing deviation of the cooperative cell relative to the main service cell.
Specifically, the obtaining, according to the real-time measurement result, an uplink timing deviation of the uplink signal transmitted by the UE when the uplink signal is transmitted in the cooperative cell with respect to when the uplink signal is transmitted in the primary serving cell may include:
respectively acquiring a first time point and a second time point according to an uplink Sounding Reference Signal (SRS) transmitted by the UE, wherein the first time point is the time when the uplink SRS reaches the cooperative cell, and the second time point is the time when the uplink SRS reaches the main serving cell;
and calculating the uplink timing deviation according to the first time point and the second time point.
Specifically, the determining, according to the uplink timing offset, a phase compensation amount of the first signal relative to the second signal may include:
determining the result obtained by inverting the uplink timing deviation as the phase compensation quantity; or,
and determining the result of adding a preset first margin value after the uplink timing deviation is inverted as the phase compensation quantity.
In a possible implementation manner, the controlling the cooperative cell to transmit the first signal after the phase pre-compensation is performed according to the phase compensation amount specifically includes:
acquiring a first signal after phase precompensation according to the phase compensation quantity;
and sending the first signal after the phase precompensation to the cooperative cell, and transmitting the first signal after the phase precompensation by the cooperative cell.
In another possible implementation manner, the controlling the cooperative cell to transmit the first signal after performing the phase pre-compensation according to the phase compensation amount specifically includes:
and sending the phase compensation amount to the cooperative cell, acquiring a first signal subjected to phase pre-compensation according to the phase compensation amount by the cooperative cell, and sending the first signal subjected to phase pre-compensation.
Specifically, the performing the phase pre-compensation according to the phase compensation amount may include:
according to the phase compensation quantity, combining a first formula to perform phase pre-compensation on the first signal, wherein the first formula is as follows:
wherein x (k) is a corresponding signal on a kth frequency domain carrier wave transmitted by the cooperative cell; x (k),the method comprises the steps of carrying out phase pre-compensation on a corresponding signal on a kth frequency domain carrier, obtaining a first signal, delta is a phase compensation amount, pi and k are constants, and N is a Fourier transform length.
Specifically, the description of the first embodiment or the second embodiment may be referred to for a method for performing cooperative scheduling by the network device 1000, and details of this embodiment of the present invention are not repeated.
Based on the network device provided in the embodiment of the present invention, because the processor may call and execute the program code stored in the memory, the first signal transmitted by the cooperative cell and subjected to the phase pre-compensation according to the phase compensation amount is shifted by the same degree as the phase compensation amount on the multipath of the delay profile as the first signal, and can be synchronized with the second signal during cooperative scheduling, so that the occurrence of the situation that the time when the first signal reaches the UE is not synchronized with the time when the second signal reaches the UE in the prior art can be avoided, and thus the transmission performance under the condition of stricter synchronization of multiple cells can be improved.
It will be clear to those skilled in the art that, for convenience and simplicity of description, the above-described apparatus is only illustrated by the division of the above functional modules, and in practical applications, the above-described function distribution may be performed by different functional modules according to needs, that is, the internal structure of the apparatus is divided into different functional modules to perform all or part of the above-described functions. For the specific working processes of the system, the apparatus, and the unit described above, reference may be made to the corresponding processes in the foregoing method embodiments, and details are not described here again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention 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 invention may be embodied in the form of a software product, which is stored in a storage medium and includes several 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 invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (15)
1. A network device is used for a wireless communication system, a main service cell and a cooperation cell of a User Equipment (UE) in the system cooperate to provide communication service for the UE, and the network device comprises an acquisition unit and a control unit;
the acquiring unit is configured to acquire a phase compensation amount of a first signal relative to a second signal, where the first signal is a PDSCH signal of a physical downlink shared channel transmitted by the cooperating cell to the UE, and the second signal is a PDCCH signal of a physical downlink control channel transmitted by the primary serving cell to the UE;
the control unit is configured to control the cooperative cell to transmit a first signal subjected to phase pre-compensation according to the phase compensation amount acquired by the acquisition unit, so that the first signal subjected to phase pre-compensation is synchronized with the second signal;
the acquisition unit comprises a first acquisition module and a determination module;
the first obtaining module is configured to obtain an uplink timing offset of the cooperative cell with respect to the primary serving cell;
the determining module is configured to determine a phase compensation amount of the first signal relative to the second signal according to the uplink timing offset acquired by the first acquiring module.
2. The network device of claim 1, wherein the first obtaining module is specifically configured to:
acquiring uplink timing deviation of an uplink signal transmitted by the UE when the uplink signal is transmitted on the cooperative cell relative to the uplink signal when the uplink signal is transmitted on the main service cell according to a real-time measurement result; or,
and acquiring a preset uplink timing deviation of the cooperative cell relative to the main service cell.
3. The network device of claim 2, wherein the first obtaining module is specifically configured to:
respectively acquiring a first time point and a second time point according to an uplink Sounding Reference Signal (SRS) transmitted by the UE, wherein the first time point is the time when the uplink SRS reaches the cooperative cell, and the second time point is the time when the uplink SRS reaches the main serving cell;
and calculating the uplink timing deviation according to the first time point and the second time point.
4. The network device according to any one of claims 1 to 3, wherein the determining module is specifically configured to:
determining the result obtained by inverting the uplink timing deviation as the phase compensation quantity; or,
and determining the result of adding a preset first margin value after the uplink timing deviation is inverted as the phase compensation quantity.
5. The network device according to any of claims 1 to 3, wherein the control unit comprises a second obtaining module and a sending module;
the second obtaining module is configured to obtain a first signal after performing phase pre-compensation according to the phase compensation amount;
the sending module is configured to send the phase pre-compensated first signal obtained by the second obtaining module to the cooperative cell, and the cooperative cell sends the phase pre-compensated first signal.
6. The network device according to any of claims 1 to 3, wherein the control unit comprises a transmission module;
the sending module is configured to send the phase compensation amount to the cooperative cell, and the cooperative cell obtains a first signal after phase pre-compensation according to the phase compensation amount and sends the first signal after phase pre-compensation.
7. The network device according to any one of claims 1 to 3, wherein the control unit is specifically configured to:
controlling the cooperative cell to transmit a first signal after phase precompensation according to the phase compensation quantity acquired by the acquisition unit and by combining a first formula, wherein the first formula is as follows:
wherein x (k) is a corresponding signal on a kth frequency domain carrier wave transmitted by the cooperative cell; x (k)' is a first signal after performing phase pre-compensation on a corresponding signal on the kth frequency domain carrier; delta is a phase compensation quantity; pi and k are constants; n is the fourier transform length.
8. A cooperative scheduling method is used in a wireless communication system, in which a main serving cell and a cooperative cell of a User Equipment (UE) cooperatively provide communication services for the UE, and the method includes:
the method comprises the steps that network equipment obtains phase compensation quantity of a first signal relative to a second signal, wherein the first signal is a Physical Downlink Shared Channel (PDSCH) signal transmitted to the UE by the cooperative cell, and the second signal is a Physical Downlink Control Channel (PDCCH) signal transmitted to the UE by the main serving cell;
the network equipment controls the cooperative cell to transmit a first signal subjected to phase pre-compensation according to the phase compensation amount so as to enable the first signal subjected to phase pre-compensation to be synchronous with the second signal;
the network device acquiring the phase compensation quantity of the first signal relative to the second signal comprises the following steps:
the network equipment acquires the uplink timing deviation of the cooperative cell relative to the main service cell;
and the network equipment determines the phase compensation quantity of the first signal relative to the second signal according to the uplink timing deviation.
9. The method of claim 8, wherein the network device obtaining the uplink timing offset of the cooperative cell relative to the primary serving cell comprises:
the network equipment acquires uplink timing deviation of an uplink signal transmitted by the UE when the uplink signal is transmitted on the cooperative cell relative to the uplink signal transmitted on the main service cell according to a real-time measurement result; or,
and the network equipment acquires the preset uplink timing deviation of the cooperative cell relative to the main service cell.
10. The method of claim 9, wherein the obtaining, by the network device according to the real-time measurement result, the uplink timing offset of the uplink signal transmitted by the UE when transmitted on the cooperative cell relative to when transmitted on the primary serving cell comprises:
the network equipment respectively acquires a first time point and a second time point according to an uplink Sounding Reference Signal (SRS) transmitted by the UE, wherein the first time point is the time when the uplink SRS reaches the cooperative cell, and the second time point is the time when the uplink SRS reaches the main serving cell;
and the network equipment calculates the uplink timing deviation according to the first time point and the second time point.
11. The method of any of claims 8 to 10, wherein the network device determining, based on the uplink timing offset, an amount of phase compensation for the first signal relative to the second signal comprises:
the network equipment determines the result obtained by negating the uplink timing deviation as the phase compensation quantity; or,
and the network equipment determines the result of adding a preset first margin value after negating the uplink timing deviation as the phase compensation quantity.
12. The method according to any one of claims 8 to 10, wherein the controlling, by the network device, the cooperative cell to transmit the first signal after the phase pre-compensation according to the phase compensation amount specifically includes:
the network equipment acquires a first signal after phase precompensation according to the phase compensation quantity;
and the network equipment sends the first signal after the phase precompensation to the cooperative cell, and the cooperative cell transmits the first signal after the phase precompensation.
13. The method according to any one of claims 8 to 10, wherein the controlling, by the network device, the cooperative cell to transmit the first signal after the phase pre-compensation according to the phase compensation amount specifically includes:
and the network equipment sends the phase compensation amount to the cooperative cell, the cooperative cell acquires a first signal subjected to phase pre-compensation according to the phase compensation amount, and sends the first signal subjected to phase pre-compensation.
14. The method according to any one of claims 8 to 10, wherein the performing phase pre-compensation according to the phase compensation amount comprises:
according to the phase compensation quantity, combining a first formula to perform phase pre-compensation on the first signal, wherein the first formula is as follows:
wherein x (k) is a corresponding signal on a kth frequency domain carrier wave transmitted by the cooperative cell; x (k)' is a first signal after performing phase pre-compensation on a corresponding signal on the kth frequency domain carrier; delta is a phase compensation quantity; pi and k are constants; n is the fourier transform length.
15. A network device for use in a wireless communication system in which a main serving cell and a cooperating cell of a user equipment UE cooperatively provide communication services to the UE, the network device comprising a processor and a memory, the memory being in communication with the processor, the memory having program code stored therein, and the processor being configured to invoke the program code stored in the memory and perform the method according to any one of claims 8-14.
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