WO2015081474A1

WO2015081474A1 - Collaborative scheduling method and network device

Info

Publication number: WO2015081474A1
Application number: PCT/CN2013/088348
Authority: WO
Inventors: 杨敬; 陈拓; 马霓
Original assignee: 华为技术有限公司
Priority date: 2013-12-02
Filing date: 2013-12-02
Publication date: 2015-06-11
Also published as: CN103875292B; CN103875292A

Abstract

Disclosed are a collaborative scheduling method and a network device, which can improve transmission performance in case in which multiple cells are not strictly synchronized. The method is used for a wireless communications system. A main serving cell and a collaborative cell of a user equipment (UE) in the system collaborate with each other to provide a communications service to the UE. The method comprises: a network device obtaining a phase compensation quantity of a first signal relative to a second signal, the first signal being a physical downlink shared channel (PDSCH) signal transmitted by the collaborative cell to the UE, and the second signal being a physical downlink control channel (PDCCH) signal transmitted by the main serving cell to the UE; and then, the network device controlling the collaborative cell to transmit the first signal obtained after phase precompensation is performed according to the phase compensation quantity, so as to enable the first signal and the second signal obtained after the phase precompensation is performed to be synchronous. The present invention is applicable to the field of communications.

Description

Collaborative scheduling method and network device

The present invention relates to the field of communications, and in particular, to a cooperative scheduling method and a network device. Background technique

For a conventional wireless cellular network, users at the edge of the serving cell are relatively poor in channel conditions due to interference from multiple cell signals, and related measurement parameters (such as reference signal received power) fed back by the user equipment (User Equipment, UE). (Reference Signal Receiving Power, RSRP) or Reference Signal Receiving Quality (RSRQ), etc., inevitably, errors occur. Therefore, according to the relevant measurement parameters fed back by the UE, the system may cause misjudgment when performing the mobility management and the cell handover decision of the UE, so that the serving cell edge user switches back and forth between the serving cell and the neighboring cell of the serving cell, and the ping-pong switching phenomenon is introduced. Reduce the user experience.

On the other hand, as the current network access volume increases, the channel capacity of the cell may be saturated, which may easily cause the cell service throughput to fail to meet the user's needs, thereby further reducing the user experience.

In the prior art, when solving the ping-pong handover problem that may occur in cell mobility management or the problem that the cell service throughput cannot meet the user's demand, the physical downlink control channel (Physical Downlink Control Channel) may be used in a multi-cell cooperation mode. The PDCCH and the Physical Downlink Shared Channel (PDSCH) are transmitted in a separate manner, that is, the primary serving cell and the coordinated cell of the UE cooperate to provide communication services for the UE, and the PDCCH channel is delivered by the primary serving cell, PD SCH The channel can be transmitted according to the state of the current channel, and the system side adaptively selects a coordinated cell with better channel quality by cooperation between multiple cells. From the perspective of the standard protocol implementation process, this method is completely feasible, but in actual use, it will face a serious problem: that is, whether the primary serving cell and the coordinated cell are two cells under different sites, or two under the same site. In fact, it is impossible to achieve very accurate signal synchronization. However, if two cells performing multi-cell cooperation cannot achieve very accurate signal synchronization, then The PDCCH signal and the PDSCH signal transmitted by the two cells in the PDCCH and PDSCH transmission separation modes cannot be accurately synchronized. This cooperative transmission mode may have a significant loss in performance, such as the orthogonal frequency of the primary serving cell. Orthogonal Frequency Division Multiplexing (OFDM) Inter Symbol Interference (ISI) or channel-specific Dedicated RS (DRS) channel estimation is severe.

Summary of the invention

Embodiments of the present invention provide a cooperative scheduling method and apparatus, which can improve transmission performance in a case where multiple cells are not strictly synchronized.

In order to achieve the above object, embodiments of the present invention use the following technical solutions:

In a first aspect, a network device is provided for a wireless communication system, in which a primary serving cell and a coordinated cell of a user terminal UE cooperate to provide a communication service for the UE, where the network device includes an acquiring unit and a control unit;

The acquiring unit is configured to acquire a phase compensation amount of the first signal relative to the second signal, where the first signal is a physical downlink shared channel PDSCH signal that is sent by the coordinated cell to the UE, and the second signal is a physical downlink control channel PDCCH signal transmitted to the UE by the primary serving cell;

The control unit is configured to control the coordinated cell to perform a phase precompensated first signal according to the phase compensation amount acquired by the acquiring unit, so that the phase precompensated first signal and the The second signal is synchronized.

In a first possible implementation manner of the first aspect, in combination with the first aspect, the acquiring unit includes a first acquiring module and a determining module;

The first acquiring module is configured to acquire an uplink timing offset of the coordinated 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 deviation acquired by the first acquiring module.

In a second possible implementation manner of the first aspect, in combination with the first possible implementation manner of the first aspect, the first acquiring module is specifically configured to:

Acquiring the uplink signal transmitted by the UE according to the real-time measurement result in the collaboration The uplink timing deviation when transmitting on the cell relative to the transmission on the primary serving cell; or

Obtaining a preset uplink timing offset of the coordinated cell with respect to the primary serving cell.

In a third possible implementation manner of the first aspect, in combination with the second possible implementation manner of the first aspect, the first acquiring module is specifically configured to:

Obtaining a first time point and a second time point according to the uplink sounding reference signal SRS sent by the UE, where the first time point is a time when the uplink SRS arrives at the coordinated cell, and the second time Point is the time when the uplink SRS arrives at the primary serving cell;

And calculating, according to the first time point and the second time point, the uplink timing offset.

In a fourth possible implementation manner of the first aspect, in combination with the first possible implementation manner of the first aspect, the third possible implementation manner of the first aspect, the determining module is specifically configured to:

Determining the result of the inverse of the uplink timing offset as the phase compensation amount; or

The result of inverting the uplink timing offset and adding a preset first margin value is determined as the phase compensation amount.

In a fifth possible implementation manner of the first aspect, in combination with the first aspect to the fourth possible implementation manner of the first aspect, the control unit includes a second acquiring module and a sending module;

The second acquiring module is configured to acquire 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 acquired by the second acquiring module to the coordinated cell, and send, by the coordinated cell, the phase pre-compensated first signal.

In a sixth possible implementation manner of the first aspect, in combination with 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 coordinated cell, and acquire, by the coordinated cell, a first signal that is phase pre-compensated according to the phase compensation amount, and after the phase pre-compensation is transmitted The first signal.

In a seventh possible implementation manner of the first aspect, in combination with the first aspect to the first possible implementation manner of the first aspect, the control unit is specifically configured to:

Controlling, by the coordinated cell, the phase compensation amount acquired according to the acquiring unit, and performing a phase precompensated first signal according to the first formula, the first formula

.2ΛΑ

X(k)' = x(k)e ~ . where is the corresponding signal on the frequency domain carrier transmitted by the coordinated cell; after phase precompensation for the corresponding signal on the frequency domain carrier The first signal; Δ is the phase compensation amount; π is a constant; N is the Fourier transform length.

In a second aspect, a cooperative scheduling method is provided for a wireless communication system, in which a primary serving cell and a coordinated cell of a user terminal UE cooperate to provide a communication service for the UE, and the method includes:

The network device acquires a phase compensation amount of the first signal relative to the second signal, where the first signal is a physical downlink shared channel PDSCH signal that is sent by the coordinated cell to the UE, and the second signal is the primary service a physical downlink control channel PDCCH signal transmitted by the cell to the UE;

The network device controls the coordinated cell to transmit a first signal after phase pre-compensation according to the phase compensation amount, so that the phase pre-compensated first signal and the second signal are synchronized.

In a first possible implementation manner of the second aspect, in combination with the second aspect, the acquiring, by the network device, the phase compensation amount of the first signal relative to the second signal includes:

Obtaining, by the network device, an uplink timing offset of the coordinated cell with respect to the primary serving cell;

The network device determines a phase compensation amount of the first signal relative to the second signal according to the uplink timing offset.

In a second possible implementation manner of the second aspect, the first aspect of the second aspect is The implementation manner of the foregoing, the acquiring, by the network device, the uplink timing offset of the coordinated cell with respect to the primary serving cell includes:

And obtaining, by the network device, a uplink timing deviation when the uplink signal sent by the UE is transmitted on the coordinated cell with respect to the uplink when transmitting on the coordinated cell according to a real-time measurement result; or

The network device acquires a preset uplink timing offset of the coordinated cell with respect to the primary serving cell.

In a third possible implementation manner of the second aspect, in combination with the second possible implementation manner of the second aspect, the network device, when the uplink signal sent by the UE is transmitted on the coordinated cell, according to the real-time measurement result The uplink timing offset relative to the transmission on the primary serving cell includes:

The network device obtains a first time point and a second time point according to the uplink sounding reference signal SRS that is sent by the UE, where the first time point is a time when the uplink SRS arrives at the coordinated cell, where The second time point is a time when the uplink SRS arrives at the primary serving cell;

The network device calculates the uplink timing offset according to the first time point and the second time point.

In a fourth possible implementation manner of the second aspect, in combination with the first possible implementation manner of the second aspect, the third possible implementation manner of the second aspect, the network device determines, according to the uplink timing offset The phase compensation amount of the first signal relative to the second signal includes:

Determining, by the network device, the result of inverting the uplink timing offset as the phase compensation amount; or

The network device determines, after the inverse of the uplink timing offset, a result of adding a preset first margin value as the phase compensation amount.

In a fifth possible implementation manner of the second aspect, in combination with the second aspect to the fourth possible implementation manner of the second aspect, the network device controls, after the phase-precompensation, the coordinated cell to perform phase pre-compensation according to the phase compensation amount The first signal specifically includes:

Obtaining, after the network device acquires phase pre-compensation according to the phase compensation amount a signal

The network device sends the phase pre-compensated first signal to the coordinated cell, and the phase pre-compensated first signal is transmitted by the coordinated cell.

In a sixth possible implementation manner of the second aspect, in combination with the second aspect, the fourth possible implementation manner of the second aspect, the network device controls, after the phase-precompensation, the coordinated cell to perform phase pre-compensation according to the phase compensation amount The first signal specifically includes:

Transmitting, by the network device, the phase compensation amount to the coordinated cell, acquiring, by the coordinated cell, a first signal after phase precompensation according to the phase compensation amount, and transmitting the first phase after the phase precompensation signal.

In a seventh possible implementation manner of the second aspect, combining the second aspect to the sixth possible implementation manner of the second aspect, the performing the phase pre-compensation according to the phase compensation amount includes:

And performing phase pre-compensation on the first signal according to the phase compensation amount, where the first formula is: =. Where is a corresponding signal on a frequency domain carrier transmitted by the coordinated cell; a first signal after phase precompensation for a corresponding signal on the frequency domain carrier; Δ is a phase compensation amount; and is a constant; N is a Fourier transform length.

In a third aspect, a network device is provided for a wireless communication system, in which a primary serving cell and a coordinated cell of a user terminal UE cooperate to provide a communication service for the UE, where the network device includes a processor and a memory. The memory is in communication with the processor, the program code is stored in the memory, and the processor is configured to invoke program code stored in the memory to perform the method of any one of the second aspects.

An embodiment of the present invention provides a cooperative scheduling method and a network device, which are used in a wireless communication system, where a primary serving cell and a coordinated cell of a UE cooperate to provide a communication service for the UE, and the method includes: acquiring, by the network device a phase compensation amount of a signal relative to a second signal, where the first signal is a PDSCH signal transmitted by the coordinated cell to the UE, and the second signal is a PDCCH that is sent by the primary serving cell to the UE Signaling; then the network device controls the coordinated cell to transmit according to the phase The bit compensation amount performs a phase precompensated first signal such that the phase precompensated first signal and the second signal are synchronized. In this way, since the phase pre-compensated first signal is offset with the phase compensation amount on the multipath of the delay spectrum with respect to the first signal, so that the second signal can be cooperatively scheduled. Synchronization can further avoid the situation that the time when the first signal arrives at the UE in the prior art is not synchronized with the time when the second signal arrives at the UE, thereby improving the transmission performance in the case where the multi-cell is not strictly synchronized.

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 embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

FIG. 1 is a collaborative scheduling method according to Embodiment 1 of the present invention;

FIG. 2 is a scenario diagram of a time when a first signal arrives at a UE lags behind a time when a second signal arrives at a UE according to Embodiment 1 of the present invention;

FIG. 3 is a scenario diagram of a time when a first signal arrives at a UE and a time when a second signal arrives at a UE according to Embodiment 1 of the present invention;

4 is a cooperative scheduling method according to Embodiment 2 of the present invention;

FIG. 5 is a schematic diagram of a PDCCH and PDSCH transmission separation according to Embodiment 2 of the present invention;

FIG. 6 is a schematic structural diagram 1 of a network device according to Embodiment 3 of the present invention; FIG. 7 is a schematic structural diagram 2 of a network device according to Embodiment 3 of the present invention; FIG. 8 is a schematic structural diagram 3 of a network device according to Embodiment 3 of the present invention; FIG. 10 is a schematic structural diagram of a network device according to Embodiment 4 of the present invention; FIG. detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only Some embodiments, rather than all of the embodiments, are invented. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Embodiment 1

An embodiment of the present invention provides a cooperative scheduling method, where the method is used in a wireless communication system, where a primary serving cell and a coordinated cell of a UE cooperate to provide a service for the UE, as shown in FIG. 1 . Specifically, it may include:

The network device acquires a phase compensation amount of the first signal with respect to the second signal, where the first signal is a PDSCH signal that is sent by the coordinated cell to the UE, and the second signal is the primary serving cell. A PDCCH signal transmitted to the UE.

Specifically, in the cooperative scheduling method provided by the embodiment of the present invention, cooperative scheduling between multiple cells is performed by using a manner in which PDCCH and PDSCH are transmitted separately. The network device determines that the UE is allocated a PDSCH in the coordinated cell, and the PDCCH is allocated in the primary serving cell, and the PDSCH signal sent by the coordinated cell to the UE is regarded as a first signal; the primary serving cell The PDCCH signal transmitted to the UE is treated as a second signal.

It should be noted that, the primary serving cell and the coordinated cell may be managed by the same base station, where the network device is located in the base station; and the primary serving cell and the coordinated cell may also be managed by different base stations, where the network The device is the base station of the primary serving cell and the upper-layer network device of the base station of the coordinated cell, which is not specifically limited in this embodiment of the present invention.

However, the manner in which the PDCCH and the PDSCH are transmitted separately is likely to cause the coordinated two cells to fail to perform accurate signal synchronization. Specifically, the following two situations may occur:

1) Case 1: The time when the first signal arrives at the UE lags behind the time when the second signal arrives at the UE:

As shown in FIG. 2, in the normal process, the UE performs synchronous tracking on the signal based on the Cell-specific Reference Signal (CRS) of the primary serving cell, and searches for the first-path position of the first signal as the timing synchronization point. In order to improve the robustness, the UE may advance several sample points as the timing synchronization point of the UE on the basis of the first path position. After the synchronization, the UE performs the OFDM signal receiving process according to the new timing synchronization point. Before performing the time-frequency conversion, the UE performs the operation of the Cyclic prefix (CP). It can be seen from Fig. 2 that under the protection of the CP, several sampling points in advance as the timing synchronization point of the UE will not affect the acquisition of the complete OFDM signal.

In this case, although the time when the first signal arrives at the UE lags the time when the second signal arrives at the UE, the UE does not significantly affect the reception processing of the signal if the lag value does not exceed the CP.

It should be noted that the CRS is a common pilot of the cell, and the specific sequence of the CRS and the occupied time-frequency location are related to the physical cell ID. The UE performs downlink channel estimation, synchronization tracking, and downlink measurement based on the CRS. For the 3rd Generation Partnership Project Release (3GPP R) 8 or 3GPP R9, or 3GPP RI O protocol, the downlink PDCCH signaling is related to channel estimation and demodulation through CRS. code.

2) Case 2: The time when the first signal arrives at the UE is ahead of the time when the second signal arrives at the UE:

As shown in FIG. 3, in the normal process, the UE performs synchronization tracking on the signal based on the CRS of the primary serving cell, and searches for the first path position of the first signal as a synchronization point. In addition, to improve the robustness, the UE may be in the first path position. Based on several sample points in advance, the timing synchronization point of the UE is used.

After the synchronization, the UE performs the OFDM signal reception process according to the new timing synchronization point. Before performing the time-frequency conversion, the UE performs the operation of removing the CP. As shown in FIG. 3, in this scenario, the UE does not receive the first signal. Complete, and will introduce the OFMD ISL. In the case of coordinated scheduling transmission, the signal of the coordinated cell of the UE and the primary serving cell may be out of synchronization, which may cause performance loss. Especially in the scenario of the above case 2, the performance loss is more serious.

In addition, considering that when performing multi-cell cooperative scheduling, in order to achieve transparency of the transmission weight and power information of the UE, it is necessary to use DRS for channel estimation. In order to improve the results of channel estimation, DRS channel estimation usually uses Wiener filtering to improve performance. In the Wiener filtering method, the Wiener filter coefficient in the frequency domain is usually a base. Produced by the prior model. When the non-specialized UE is calculated based on the Wiener filter coefficient of the prior model, the timing deviation problem of the UE is considered in the modeling. Generally, according to the conventional timing tracking process, the timing deviation is generally limited to several samples (tens of nanoseconds), but the timing deviation generated in at least one of the following cases, for example: Global Positioning System , GPS) There may still be significant timing deviations for simultaneous transmission between base stations; timing deviation caused by the difference between the base station of the coordinated cell of the UE and the base station of the primary serving cell of the UE relative to the air interface of the UE (according to the transmission speed of the electromagnetic wave, 1 There is a transmission delay of 3.3 ns, if the air gap distance is 50 meters, it means a difference of 165 ns); the transmission delay deviation caused by the device is not ideal, so that the time when the first signal arrives at the UE and the time when the second signal arrives at the UE The timing offset may be much more than a few tens of nanoseconds. This situation will cause the DRS channel estimation prior model to not match the real signal, which will seriously affect the performance of the DRS channel estimation.

It should be noted that the DRS is a user-specific demodulation pilot, which can directly carry the downlink precoding/beamforming weight, and can also directly carry the power information. Therefore, channel estimation by DRS can obtain equivalent weighted channel information, which means that the system side can achieve transparency of the UE's transmission weight and power information.

Therefore, in the embodiment of the present invention, the network device acquires a phase compensation amount of the first signal with respect to the second signal, and the phase compensation amount may synchronize the phase pre-compensated first signal and the second signal in cooperative scheduling.

Specifically, the phase compensation amount can be obtained as follows:

After acquiring the uplink timing offset of the coordinated cell with respect to the primary serving cell, the network device determines a phase compensation amount of the first signal relative to the second signal according to the uplink timing offset, where the uplink timing offset may be preset The network device may also be obtained according to the real-time measurement result, which is not specifically limited in this embodiment of the present invention.

102. The network device controls the coordinated cell to transmit a first signal that is phase pre-compensated according to the phase compensation amount, so that the phase pre-compensated first signal and the second signal are synchronized.

Specifically, the network device acquires a phase of the first signal relative to the second signal After the compensation amount, the network device controls the coordinated cell to transmit a first signal after phase pre-compensation according to the phase compensation amount.

Specifically, the embodiment of the present invention provides a method for the following two network devices to control the coordinated cell to transmit the phase precompensated first signal:

After the network device acquires the phase compensation amount, the phase pre-compensation is performed on the first signal according to the phase compensation amount, and the first signal after phase pre-compensation is obtained, and then the phase pre-compensation is performed. And transmitting a first signal to the coordinated cell, where the phase pre-compensated first signal is transmitted by the coordinated cell;

Manner 2: The network device sends the obtained phase compensation amount to the coordinated cell, and the coordinated cell performs phase pre-compensation on the first signal according to the phase compensation amount, and obtains phase pre-compensation. The phase pre-compensated first signal is transmitted after the first signal.

The embodiment of the present invention does not specifically limit the manner in which the network device controls the coordinated cell to transmit the phase pre-compensated first signal.

Specifically, the method for performing phase pre-compensation on the first signal by the network device or the coordinated cell according to the phase compensation amount may be as follows:

According to the phase compensation amount, the first signal is phase precompensated in combination with the formula (1).

= x(k)e ^N Equation (1) where is the corresponding signal on the frequency domain carrier transmitted by the coordinated cell; the first signal after phase precompensation for the corresponding signal on the frequency domain carrier Δ is the phase compensation amount; , ^: is a constant, and N is the Fourier transform length, depending on the bandwidth of the coordinated cell. Exemplarily, if it is a 20M bandwidth, N can be set to 2048; if it is 10M Bandwidth, then N can be set to 1024.

Substituting the first signal and the phase compensation amount into the formula (1), the phase precompensated first signal can be obtained.

An embodiment of the present invention provides a cooperative scheduling method, where the method is used in a wireless communication system, where a primary serving cell and a coordinated cell of a UE cooperate to provide the UE The communication service, the method includes: the network device acquiring a phase compensation amount of the first signal relative to the second signal, where the first signal is a PDSCH signal that is sent by the coordinated cell to the UE, and the second signal is Transmitting, by the primary serving cell, a PD C CH signal to the UE; and then the network device controls the coordinated cell to transmit a first signal after phase pre-compensation according to the phase compensation amount. In this way, since the phase pre-compensated first signal is offset with the phase compensation amount on the multipath of the delay spectrum with respect to the first signal, so that the second signal can be cooperatively scheduled. The synchronization can prevent the situation that the time when the first signal arrives at the UE in the prior art is not synchronized with the time when the second signal arrives at the UE, thereby improving the transmission performance in the case where the multi-cell is not strictly synchronized. Embodiment 2

An embodiment of the present invention provides a cooperative scheduling method, where the method is used in a wireless communication system, in which a primary serving cell and a coordinated cell of a UE cooperate to provide a service for the UE, and the embodiment of the present invention combines a PDSCH and a PDCCH to transmit a separate signal. The description of the technology, as shown in Figure 4, includes:

401. The network device determines that the UE is allocated a PDSCH in the coordinated cell, and a PDCCH is allocated in the primary serving cell.

Specifically, in the prior art, in order to solve the problem that the ping-pong handover problem may occur in the cell mobility management or the cell service throughput cannot meet the user demand, the PDCCH and the PDSCH may be separately transmitted in a multi-cell cooperative manner. For the integrity of the solution implementation, the embodiment of the present invention firstly provides the following conditions for the network device to determine cooperative scheduling for the UE:

a. The system side identifies the user capability, and identifies the protocol version supported by the UE and the Multiple-Input Multiple-Out-put (MIMO) capability.

Exemplarily, the protocol version supported by the UE may be a CRS-based transmission mode (transmission mode, ΤΜ) 2, ΤΜ3, ΤΜ4, ΤΜ5, ΤΜ6; or the protocol version supported by the UE may be DRS-based ΤΜ7, 8, 9 10; Here only some examples of the types of protocol versions supported by the UE are listed, and which protocol is specifically supported by the UE. The version is not specifically limited.

Among them, TM7 is the R8 protocol feature, TM8 is the R9 protocol feature, TM9 is the R10 protocol feature, and TM 10 is the R1 1 post-protocol feature.

b. The base station of each serving cell receives relevant measurement parameters fed back by the UE, for example, RSRP, RSRQ, and the like of the serving cell and the neighboring cell, and receives channel quality indicator (CQI) measurement information of each service cell.

c. The system side determines whether the UE is 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.

Exemplarily, whether the UE is at the cell edge may be determined according to the reference signal received power RSRP. For example, if the RSRP of the serving cell is the RSRP of the neighboring cell, it may be determined that the UE is at the edge of the serving cell.

d. The edge UE with DRS, if the cell service throughput performance cannot meet the demand, or the user frequently has the ping-pong handover phenomenon in a short period of time, the network device determines to cooperatively schedule and transmit the UE.

Further, after the network device determines that the UE is cooperatively scheduled, the specific process of separating the PDCCH and the PDSCH from the UE may be briefly described as follows:

First, in cooperative scheduling, for R8 edge users, it is switched to TM7 mode through high-level signaling; for R9 edge users, it is switched to TM8 mode through high-level signaling; for R10 edge users, It is switched to TM9 mode by high-level signaling, and for R1 1 edge users, it is switched to TM 10 mode by higher layer signaling.

Next, as shown in FIG. 5, the network device determines that the UE is allocated a PDSCH in the coordinated cell, and a PDCCH is allocated in the primary serving cell.

It should be noted that the PDSCH is allocated to the UE by the coordinated cell of the UE, and the PDCCH is allocated by the primary serving cell of the UE to the UE because the signaling packet is transmitted by the primary serving cell (ie, the serving cell) to make the whole The cooperative scheduling process does not feel the handover, and the transmission of the data packet by the coordinated cell (ie, the neighboring cell) can alleviate the channel load of the primary serving cell, thereby enabling the user to obtain better quality of service without feeling the handover. , improve user experience, and avoid the frequency of ping-pong switching It happens.

It should be noted that FIG. 5 is only a scenario diagram showing a separation of PDCCH and PDSCH transmission. In the scenario diagram, the primary serving cell and the coordinated cell are managed by different base stations, where the network device is The base station of the primary serving cell and the upper-layer network device of the base station of the coordinated cell, but as described in step 101, the primary serving cell and the coordinated cell may also be managed by the same base station, which is in the embodiment of the present invention. This is not specifically limited.

402. The network device acquires an uplink timing offset of the coordinated cell with respect to the primary serving cell.

Specifically, the network device may obtain the uplink timing offset by:

The uplink timing deviation of the cell of the UE relative to the primary service cell is pre-stored in the network device, and the network device may obtain the preset uplink timing offset.

It should be noted that the uplink timing offset is a priori information for the coordinated cell of the UE, and is applicable to all UEs that access the coordinated cell, and may be performed according to multiple times of real-time measurement of the uplink timing offset of the coordinated cell and the serving cell. The statistical determination is not specifically limited in the embodiment of the present invention.

Optionally, the network device may obtain the uplink timing offset by:

And obtaining, by the network device, a uplink timing offset when the uplink signal transmitted by the UE is transmitted on the coordinated cell with respect to the uplink when transmitting on the coordinated cell according to a real-time measurement result.

A method for obtaining, by the network device, an uplink timing offset when the uplink signal transmitted by the UE is transmitted on the coordinated cell with respect to the uplink serving cell according to the real-time measurement result is as follows:

First, the network device obtains a first time point and a second time point according to the pilot of the sounding reference signal (SRS) sent by the UE, where the first time point is the uplink The time when the SRS arrives at the coordinated cell, and the second time point is that the uplink SRS arrives at the primary service The time of the community.

It should be noted that the pilot of the uplink SRS is mainly used for measuring and estimating the quality of the uplink channel, and calculating a signal to interference plus noise ratio (SINR) of the uplink channel, specifically for supporting the UE. Upstream scheduling. 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 obtained, thereby acquiring the uplink timing deviation, that is,

Upstream timing deviation=first time point-second time point formula (2) It can be seen from the formula (2) that the uplink timing deviation may be a positive value or a negative value, which is not used by the embodiment of the present invention. Specifically limited.

403. The network device determines, according to the uplink timing offset, a phase compensation amount of the first signal relative to the second signal.

The first signal is a PDSCH signal that is sent by the coordinated cell to the UE, and the second signal is a PDCCH signal that is sent 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 the inverse of the uplink timing offset may be determined as a phase compensation amount; or, in combination with the analysis of the first case in the embodiment shown in FIG. 1, when the first signal arrives at the UE during cooperative scheduling, The time lags behind the time when the second signal arrives at the UE. If the hysteresis value does not exceed the CP, the acquisition of the complete OFDM signal is not affected. Therefore, in order to ensure that the cooperative scheduling is as far as possible in the scenario described in the first case, after obtaining the uplink timing offset, the result of the inverse of the uplink timing offset and the preset first margin value is determined as The phase compensation amount, wherein the first margin value may be a positive number or a negative number, which is not specifically limited in the embodiment of the present invention, and the value of the first margin is in a range from 0 to CP.

404. The network device controls the coordinated cell to transmit a first signal that is phase pre-compensated according to the phase compensation amount, so that the phase pre-compensated first signal and the second signal are synchronized. Specifically, after the network device acquires a phase compensation amount of the first signal with respect to the second signal, the network device controls the coordinated cell to transmit a first signal that is phase pre-compensated according to the phase compensation amount.

Specifically, the method for the network device to control the phase-precompensated first signal of the coordinated cell may be referred to the description of step 102 in the embodiment shown in FIG. 1 , and details are not described herein again.

Specifically, the method for the phase pre-compensation of the first signal by the network device or the coordinated cell of the UE may refer to the description of step 102 in the embodiment shown in FIG. 1 , and details are not described herein again. .

An embodiment of the present invention provides a cooperative scheduling method, where the method is used in a wireless communication system, where a primary serving cell and a coordinated cell of a UE cooperate to provide a communication service for the UE, and the method includes: acquiring, by the network device a phase compensation amount of a signal relative to the second signal, wherein the first signal is a PDSCH signal transmitted by the coordinated cell to the UE, and the second signal is a PD that is sent by the primary serving cell to the UE C CH signal; then the network device controls the coordinated cell to transmit a first signal after phase pre-compensation according to the phase compensation amount. In this way, since the phase pre-compensated first signal is offset with the phase compensation amount on the multipath of the delay spectrum with respect to the first signal, so that the second signal can be cooperatively scheduled. The synchronization can prevent the situation that the time when the first signal arrives at the UE in the prior art is not synchronized with the time when the second signal arrives at the UE, thereby improving the transmission performance in the case where the multi-cell is not strictly synchronized. Embodiment 3

An embodiment of the present invention provides a network device 600, which is used in a wireless communication system, where a primary serving cell and a coordinated cell of a user terminal UE cooperate to provide a communication service for the UE, and the network device 600 in this embodiment can use For the corresponding operations in the foregoing method embodiments, 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 acquire a phase of the first signal relative to the second signal a compensation amount, where the first signal is a physical downlink shared channel PDSCH signal that is sent by the coordinated cell to the UE, and the second signal is a physical downlink control channel PDCCH signal that is sent by the primary serving cell to the UE .

The control unit 602 is configured to control the coordinated cell to perform a phase precompensated first signal according to the phase compensation amount acquired by the acquiring unit 601, so that the phase precompensated first signal and The second signal is synchronized.

Further, as shown in FIG. 7, the acquiring unit 601 specifically includes a first acquiring module 601 1 and a determining module 6012.

The first obtaining module 601 1 is configured to acquire an uplink timing offset of the coordinated cell with respect to the primary serving cell.

The determining module 6012 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 601 1 .

Further, the first acquiring module 601 1 is specifically configured to acquire an uplink timing offset of the coordinated cell with respect to the primary serving cell as follows:

Obtaining, according to the real-time measurement result, an uplink timing deviation when the uplink signal transmitted by the UE is transmitted on the coordinated cell with respect to the transmission on the primary serving cell; or

Further, the first obtaining module 601 1 obtains, according to the real-time measurement result, an uplink timing offset when the uplink signal transmitted by the UE is transmitted on the coordinated cell, and when it is transmitted on the primary serving cell, specifically:

And calculating, according to the first time point and the second time point, the uplink timing offset. Further, the determining module 6012 is specifically configured to determine, according to the uplink timing offset acquired by the first acquiring module 601 1 , a phase compensation amount of the first signal relative to the second signal:

Further, the control unit 602 may control the coordinated cell to transmit the first signal after the phase pre-compensation according to the phase compensation amount acquired by the acquiring unit 601 as follows:

In a possible implementation manner, 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 acquire a first signal after phase precompensation according to the phase compensation amount.

The sending module 6022 is configured to send the phase pre-compensated first signal acquired by the second acquiring module 6021 to the coordinated cell, and send the phase pre-compensated first by the coordinated cell. 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 coordinated cell, obtain, by the coordinated cell, a first signal that is phase pre-compensated according to the phase compensation amount, and transmit the phase pre-compensation After the first signal.

Further, the control unit 602 is specifically configured to:

Controlling, by the coordinated cell, the phase compensation amount obtained according to the acquiring unit 601, and performing a phase precompensated first signal according to the first formula, where the first formula is: x(k)' = x( k) e ~ ; where is the corresponding signal on the A frequency domain carrier transmitted by the coordinated cell; after the phase precompensation for the corresponding signal on the frequency domain carrier a signal; Δ is the phase compensation amount; , is a constant; N is the Fourier transform length. Specifically, the method for performing the cooperative scheduling by using the network device 600 may be referred to the description of the first embodiment or the second embodiment, and details are not described herein again.

An embodiment of the present invention provides a network device, where the primary serving cell and the coordinated cell of the UE cooperate to provide a communication service for the UE, where the acquiring unit acquires the first signal relative to the second signal. a phase compensation amount, where the first signal is a physical downlink shared channel PDSCH signal transmitted by the coordinated cell to the UE, and the second signal is a physical downlink control channel that is sent by the primary serving cell to the UE a PDCCH signal; the control unit controls the coordinated cell to transmit a phase precompensated first signal according to the phase compensation amount acquired by the acquiring unit, so that the phase precompensated first signal and the second Signal synchronization. In this way, because the control unit controls the phase pre-compensated first signal transmitted by the coordinated cell to perform the same degree of offset as the phase compensation amount on the multipath of the delay spectrum with respect to the first signal. Therefore, the second signal can be synchronized in the cooperative scheduling, so that the time when the first signal arrives at the UE in the prior art is not synchronized with the time when the second signal arrives at the UE, so that the multi-cell is not strictly synchronized. Launch performance. Embodiment 4

The embodiment of the present invention provides a network device 1000, which is used in a wireless communication system, where a primary serving cell and a coordinated cell of a user terminal UE cooperate to provide a communication service for the UE, and the network device 1000 in this embodiment can use The corresponding operation in the foregoing method embodiment is performed. 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, and the program is stored in the memory 1002. a code, and the processor 1001 is configured to invoke the program code stored in the memory 1002, and perform the following operations:

Obtaining a phase compensation amount of the first signal relative to the second signal, where the first signal is a physical downlink shared channel PDSCH signal that is sent by the coordinated cell to the UE, and the second signal is sent by the primary serving cell Physical downlink control for the UE Channel PDCCH signal.

And controlling the coordinated cell to transmit a first signal after phase precompensation according to the phase compensation amount, so that the phase precompensated first signal and the second signal are synchronized.

Specifically, the acquiring the phase compensation of the first signal relative to the second signal may include:

Obtaining an uplink timing offset of the coordinated cell with respect to the primary serving cell; determining a phase compensation amount of the first signal relative to the second signal according to the uplink timing offset.

Specifically, the acquiring the uplink timing offset of the coordinated cell with respect to the primary serving cell may include:

Specifically, the obtaining, according to the real-time measurement result, the uplink timing deviation when the uplink signal transmitted by the UE is transmitted on the coordinated cell with respect to the uplink transmission on the primary serving cell may include:

Specifically, the determining, according to the uplink timing offset, the phase compensation amount of the first signal relative to the second signal may include:

Determining the result of inverting the uplink timing offset as the phase compensation amount; or The result of inverting the uplink timing offset and adding a preset first margin value is determined as the phase compensation amount.

In a possible implementation manner, the controlling, by the coordinated cell, the first signal after the phase pre-compensation according to the phase compensation amount includes:

Acquiring a first signal after phase precompensation according to the phase compensation amount; transmitting the phase precompensated first signal to the coordinated cell, and transmitting, by the coordinated cell, the phase precompensated first signal.

In another possible implementation manner, the controlling, by the coordinated cell, the first signal after performing phase pre-compensation according to the phase compensation amount includes:

Transmitting the phase compensation amount to the coordinated cell, and acquiring, by the coordinated cell, a first signal after phase precompensation according to the phase compensation amount, and transmitting the phase precompensated first signal.

Specifically, the performing the phase pre-compensation according to the phase compensation amount may include: performing phase pre-compensation on the first signal according to the phase compensation amount according to the first formula, where the first formula is: x ( t)' = x( t) _e 7 ; wherein, the corresponding signal on the A frequency domain carrier transmitted by the coordinated cell; the first after phase precompensation for the corresponding signal on the frequency domain carrier Signal; Δ is the phase compensation amount; , is a constant; Ν is the Fourier transform length.

For example, the method for performing the cooperative scheduling by the network device 1 may refer to the description of the first embodiment or the second embodiment, and details are not described herein again.

The network device provided by the embodiment of the present invention, because the processor can call and execute the program code stored in the memory, so that the first signal after the phase pre-compensation according to the phase compensation amount is transmitted by the coordinated cell Performing the same degree of offset as the phase compensation amount on the multipath of the time delay spectrum with respect to the first signal, and synchronizing with the second signal during cooperative scheduling, thereby preventing the first signal from reaching the UE in the prior art. The moment is not synchronized with the moment when the second signal arrives at the UE, thereby improving the transmission performance in the case where the multi-cell is not strictly synchronized.

Those skilled in the art will clearly understand that it is convenient and simple for the description. Jie, the device described above is only illustrated by the division of each functional module mentioned above. In practical applications, the above function assignment can be completed by different functional modules as needed, that is, the internal structure of the device is divided into different functional modules. To complete all or part of the functions described above. For the specific working process of the system, the device and the unit described above, reference may be made to the corresponding process in the foregoing method embodiments, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed system, apparatus, and method may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be used. Combined or can be integrated into another system, or some features can be ignored, or not executed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in electrical, mechanical or other form.

The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, i.e., may be located in one place, or may be distributed over multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiment of the present embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the 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 standalone 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 in the form of a software product, or a part of the technical solution, which is stored in a storage medium. The instructions include a plurality of instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a USB flash drive, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like, which can store program codes. Medium.

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the appended claims.

Claims

claims

1. A network device, characterized in that it is used in a wireless communication system. In the system, the main serving cell and the cooperative cell of the user terminal UE cooperate to provide communication services for the UE. The network device includes an acquisition unit and a control unit. ;

The acquisition unit is configured to acquire the phase compensation amount of the first signal relative to the second signal, where the first signal is the physical downlink shared channel PDSCH signal transmitted by the coordinated cell to the UE, and the second signal Be the physical downlink control channel PDCCH signal transmitted by the primary serving cell to the UE;

The control unit is configured to control the cooperative cell to transmit a first signal that is phase pre-compensated according to the phase compensation amount obtained by the acquisition unit, so that the phase pre-compensated first signal is equal to the phase pre-compensated first signal. The second signal is synchronized.

2. The network device according to claim 1, characterized in that the acquisition unit includes a first acquisition module and a determination module;

The first acquisition module is used to acquire the uplink timing deviation of the coordinated cell relative to the main serving cell;

The determination module is configured to determine the phase compensation amount of the first signal relative to the second signal according to the uplink timing deviation obtained by the first acquisition module.

3. The network device according to claim 2, characterized in that the first acquisition module is specifically used for:

According to the real-time measurement results, obtain the uplink timing deviation of the uplink signal transmitted by the UE when it is transmitted on the cooperative cell relative to when it is transmitted on the main serving cell; or,

Obtain the preset uplink timing deviation of the coordinated cell relative to the primary serving cell.

4. The network device according to claim 3, characterized in that the first acquisition module is specifically used for:

According to the uplink sounding reference signal SRS transmitted by the UE, a first time point and a second time point are respectively obtained, wherein the first time point is the time when the uplink SRS arrives at the coordinated cell, and the second time point point for the upstream SRS to reach the primary service Community time;

The uplink timing deviation is calculated according to the first time point and the second time point.

5. The network device according to any one of claims 2 to 4, characterized in that the determining module is specifically used to:

The result of inverting the uplink timing deviation is determined as the phase compensation amount; or,

The result of inverting the uplink timing deviation and adding a preset first margin value is determined as the phase compensation amount.

6. The network device according to any one of claims 1 to 5, characterized in that the control unit includes a second acquisition module and a sending module;

The second acquisition module is used to acquire the first signal after phase pre-compensation according to the phase compensation amount;

The sending module is configured to send the phase pre-compensated first signal acquired by the second acquisition module to the coordinated cell, and the coordinated cell transmits the phase pre-compensated first signal.

7. The network device according to any one of claims 1 to 5, characterized in that 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 the first signal after phase pre-compensation according to the phase compensation amount, and transmits the phase pre-compensated signal. the first signal.

8. The network device according to any one of claims 1 to 7, characterized in that the control unit is specifically used for:

Control the cooperative cell to transmit the phase compensation amount obtained according to the acquisition unit, and combine it with a first formula to perform phase pre-compensation on the first signal. The first formula is: x(ky = x(k)e ~; where, is the corresponding signal on the A-th frequency domain carrier transmitted by the cooperative cell; is the first signal after phase pre-compensation of the corresponding signal on the A-th frequency domain carrier signal; Δ is the phase compensation amount; , are constants; Ν is the Fourier transform length.

9. A cooperative scheduling method, characterized in that it is used in a wireless communication system. In the system, the main serving cell and the cooperative cell of the user terminal UE cooperate to provide communication services for the UE. The method includes:

The network device obtains the phase compensation amount of the first signal relative to the second signal, where the first signal is the physical downlink shared channel PDSCH signal transmitted by the coordinated cell to the UE, and the second signal is the primary service The physical downlink control channel PDCCH signal transmitted by the cell to the UE;

The network device controls the cooperative cell to transmit the first signal that is phase pre-compensated according to the phase compensation amount, so that the phase pre-compensated first signal and the second signal are synchronized.

10. The method according to claim 9, wherein the network device obtains the phase compensation amount of the first signal relative to the second signal including:

The network device obtains the uplink timing deviation of the coordinated cell relative to the main serving cell;

The network device determines the phase compensation amount of the first signal relative to the second signal based on the uplink timing deviation.

11. The method according to claim 10, characterized in that: the network device obtains the uplink timing deviation of the cooperative cell relative to the main serving cell: the network device obtains the uplink timing deviation according to the real-time measurement result. The uplink timing deviation of the uplink signal transmitted by the UE when it is transmitted on the coordinated cell relative to when it is transmitted on the main serving cell; or,

The network device obtains a preset uplink timing offset of the coordinated cell relative to the main serving cell.

12. The method according to claim 11, characterized in that, according to the real-time measurement results, the network device obtains the uplink signal transmitted by the UE when it is transmitted on the cooperative cell relative to when it is transmitted on the main serving cell. Upstream timing deviations include:

The network device obtains a first time point and a second time point respectively according to the uplink sounding reference signal SRS transmitted by the UE, wherein the first time point is the uplink sounding reference signal SRS. The time when SRS arrives at the coordinated cell, and the second time point is the time when the uplink SRS arrives at the main serving cell;

The network device calculates the uplink timing deviation according to the first time point and the second time point.

13. The method according to any one of claims 10 to 12, wherein the network device determines the phase compensation amount of the first signal relative to the second signal according to the uplink timing deviation including:

The network device determines the result of inverting the uplink timing deviation as the phase compensation amount; or,

The network device determines the phase compensation amount by inverting the uplink timing deviation and adding a preset first margin value.

14. The method according to any one of claims 9 to 13, characterized in that, the network device controlling the coordinated cell to transmit the first signal after phase pre-compensation according to the phase compensation amount specifically includes:

The network device obtains the first signal after phase pre-compensation according to the phase compensation amount;

The network device sends the phase pre-compensated first signal to the coordinated cell, and the coordinated cell transmits the phase pre-compensated first signal.

15. The method according to any one of claims 9 to 13, characterized in that, the network device controlling the coordinated cell to transmit the first signal after phase pre-compensation according to the phase compensation amount specifically includes:

The network device sends the phase compensation amount to the cooperative cell, and the cooperative cell obtains the first signal after phase pre-compensation according to the phase compensation amount, and transmits the first signal after phase pre-compensation. Signal.

16. The method according to any one of claims 9 to 15, wherein the phase pre-compensation based on the phase compensation amount includes:

According to the phase compensation amount and combined with the first formula, phase pre-compensation is performed on the first signal. The first formula is: _X ( y = _X ( )e ^J T ; Wherein, is the corresponding signal on the A-th frequency domain carrier transmitted by the cooperative cell; is the first signal after phase pre-compensation is performed on the corresponding signal on the A-th frequency domain carrier; Δ is the phase compensation amount; , are constants ; Ν is the Fourier transform length.

17. A network device, characterized in that it is used in a wireless communication system. In the system, the main serving cell and the cooperative cell of the user terminal UE cooperate to provide communication services for the UE. The network device includes a processor and a memory, The memory communicates with the processor, program code is stored in the memory, and the processor is used to call the program code stored in the memory to execute the method according to any one of claims 9 to 16.