WO2016061824A1

WO2016061824A1 - Data transmission method and base station

Info

Publication number: WO2016061824A1
Application number: PCT/CN2014/089480
Authority: WO
Inventors: 代建设
Original assignee: 华为技术有限公司
Priority date: 2014-10-24
Filing date: 2014-10-24
Publication date: 2016-04-28
Also published as: CN105765891A; CN105765891B

Abstract

Provided in an embodiment of the present invention are a data transmission method and a base station, being applied in a cell with a plurality of radio remote units (RRU), and the method comprises: determining that a UE located in the cell is an independent-scheduling UE, the independent-scheduling UE indicating that the UE is only located within coverage of a first RRU in a plurality of RRUs; transmitting via the first RRU a first channel state information-reference signal (CSI-RS) and a first demodulation reference signal (DMRS) on a first time-frequency resource, transmitting via the second RRU a second channel state information-reference signal (CSI-RS) and a second demodulation reference signal (DMRS) on a second time-frequency resource, the first CSI-RS being used for a channel measurement by the independent-scheduling UE, the first DMRS being used for a data demodulation by the independent-scheduling UE, and the second RRU comprising the RRUs except the first RRU of the plurality of RRUs. The embodiment of the present invention improves UE throughput rate.

Description

Method and base station for data transmission

Technical field

The present invention relates to the field of communications, and in particular, to a method and a base station for data transmission.

Background technique

In the existing multi-radio remote unit (RRU) common cell networking solution, in order to further improve the capacity of the multi-RRU common cell, in the multiple RRU common cell, the user equipment located in the RRU center can use the same The resources are respectively transmitted by the user equipment. The user equipment is called an independent scheduling user equipment. The user equipment of the RRU coverage boundary can jointly send data. The user equipment is called a joint scheduling user equipment.

Since the independently scheduled user equipment occupies only the time-frequency resources of a single RRU, different RRUs can transmit different data to different independent scheduling user equipments on the same time-frequency resource to implement resource multiplexing. However, the signal strength and signal quality of the reference signal (Reference Signal, RS) received by the independently scheduled user equipment is higher than the received signal strength and signal quality of the Physical Downlink Shared Channel (PDSCH), that is, RS and The PDSCH channels do not match, and the independently scheduled user equipment is measured and demodulated based on the RS, and thus the throughput of the user equipment is reduced.

Summary of the invention

The embodiment of the invention provides a method and a base station for data transmission, which can improve the throughput rate of the user equipment.

The first aspect provides a method for data transmission, which is applied to a plurality of radio remote unit RRU common cells, where the method includes: determining that the user equipment UE located in the cell is an independently scheduled UE, where the independent Scheduling the UE to indicate that the UE is located only within the coverage of the first RRU of the plurality of RRUs; and transmitting, by the first RRU, the first channel state information reference signal CSI-RS and the first demodulation reference on the first time-frequency resource a signal DMRS, by using the second RRU, to send, on the second time-frequency resource, a second channel state information reference signal CSI-RS and a second demodulation reference signal DMRS, where the first CSI-RS is used for the independent scheduling UE to perform channel measurement The first DMRS is used by the independently scheduled UE to perform demodulation data, where the second RRU includes an RRU of the plurality of RRUs other than the first RRU.

In combination with the first aspect, in the first possible implementation, the determining is used in the cell. The user equipment UE is an independently scheduled UE, and includes: determining, according to the multiple reference signal receiving strength RSRPs of the multiple RRUs to the UEs in the cell, that the UE is an independently scheduled UE.

With reference to the first possible implementation manner, in a second possible implementation manner, the determining, by the multiple RRUs, the plurality of reference signal received strengths RSRPs of the UEs in the cell, determining that the UE is an independently scheduled UE, including: determining The multiple RRUs reach the multiple RSRPs of the UE, where the multiple RSRPs include the RSRPs of each of the multiple RRUs that reach the UE; and determine that the RRU corresponding to the largest RSRP of the multiple RSRPs is the UE The RRU of the plurality of RRUs other than the first RRU is the second RRU; when the ratio of the RSRP of the first RRU to the RSRP of all the RRUs in the second RRU is greater than a preset When the threshold is used, it is determined that the UE is an independently scheduled UE.

With reference to the second possible implementation manner, in a third possible implementation, the method further includes: receiving, by the UE, multiple uplink reference signals corresponding to multiple RRUs, where the multiple uplink reference signals include An uplink reference signal corresponding to each of the plurality of RRUs, where the determining that the multiple RRUs reach the multiple RSRPs of the UE includes: performing measurement according to the multiple uplink reference signals, acquiring the UE to the multiple RSRP of the RRU; determining, according to the RSRP of the UE to the multiple RRUs, multiple RSRPs of the multiple RRUs to the UE.

With reference to the first aspect, any one of the first to the third possible implementation manners, in the fourth possible implementation manner, the first RRU is sent by using the first RRU on the first time-frequency resource. a channel state information reference signal CSI-RS and a first demodulation reference signal DMRS, by which the second channel state information reference signal CSI-RS and the second demodulation reference signal DMRS are transmitted on the second time-frequency resource, The method includes: transmitting, by using the first RRU, a first CSI-RS and a first DMRS on the first time-frequency resource according to different signal transmission locations, and transmitting, by using the second RRU, the second CSI-RS on the second time-frequency resource and Transmitting, by the first RRU, the first CSI-RS and the first DMRS on the first time-frequency resource, and transmitting the second DMRS on the second time-frequency resource by using the second RRU, according to the difference of the scrambling code sequence number NSCID. The second CSI-RS and the second DMRS.

With reference to the fourth possible implementation manner, in a fifth possible implementation, the first CSI-RS and the first DMRS are sent by using the first RRU on the first time-frequency resource according to the NSCID. The second RRU sends the second CSI-RS and the second DMRS on the second time-frequency resource, including: when the NSCID takes a value of 0, sending the first CSI-RS and the first CSI-RS on the first time-frequency resource by using the first RRU The first DMRS, when the NSCID takes a value of 1, sends the second CSI-RS and the second DMRS on the second time-frequency resource by using the second RRU.

In a second aspect, a base station is provided, including: a determining unit, configured to determine that the user equipment UE located in the cell is an independently scheduled UE, where the independent scheduling UE indicates that the UE is only located in the first of the multiple RRUs a transmitting unit, configured to send, by using the first RRU, the first channel state information reference signal CSI-RS and the first demodulation reference signal DMRS on the first time-frequency resource, by using the second RRU And transmitting, by the second time-frequency resource, a second channel state information reference signal CSI-RS and a second demodulation reference signal DMRS, where the first CSI-RS is used for performing channel measurement by the independent scheduling UE, where the first DMRS is used for the independent scheduling The UE performs demodulation data, where the second RRU includes an RRU of the plurality of RRUs except the first RRU.

With reference to the second aspect, in a first possible implementation manner, the determining unit determines, according to the multiple RSRUs of the multiple RRUs to the UEs in the cell, that the UE is an independently scheduled UE.

With reference to the first possible implementation manner of the second aspect, in a second possible implementation, the determining unit determines that the multiple RRUs reach multiple RSRPs of the UE, where the multiple RSRPs include the multiple RRUs Each of the RRUs of the plurality of RRUs is the first RRU of the UE, and the RRUs of the plurality of RRUs other than the first RRU are the second The RRU is determined to be an independently scheduled UE when the ratio of the sum of the RSRP of the first RRU and the RSRP of all the RRUs in the second RRU is greater than a preset threshold.

With reference to the second possible implementation of the second aspect, in a third possible implementation, the base station further includes a receiving unit, configured to receive, by the UE, multiple uplink reference signals corresponding to the multiple RRUs, where The plurality of uplink reference signals include an uplink reference signal corresponding to each of the plurality of RRUs, wherein the determining unit performs measurement according to the plurality of uplink reference signals, and acquires an RSRP of the UE to the multiple RRUs; The RSRP of the UE to the multiple RRUs determines multiple RSRPs of the multiple RRUs to the UE.

With reference to the second aspect, any one of the first to the third possible implementation manners of the second aspect, in a fourth possible implementation, the sending unit passes the The first RRU sends the first CSI-RS and the first DMRS on the first time-frequency resource, and sends the second CSI-RS and the second DMRS on the second time-frequency resource by using the second RRU, or according to different NSCIDs, And transmitting, by the first RRU, the first CSI-RS and the first DMRS on the first time-frequency resource, and sending, by using the second RRU, the second CSI-RS and the second DMRS on the second time-frequency resource.

In conjunction with the fourth possible implementation of the second aspect, in a fifth possible implementation manner, When the value of the NSCID is 0, the sending unit sends the first CSI-RS and the first DMRS on the first time-frequency resource by using the first RRU. When the NSCID is 1, the sending unit passes the second RRU. Transmitting the second CSI-RS and the second DMRS on the second time-frequency resource.

Therefore, the embodiment of the present invention determines that the user equipment UE located in the cell is an independently scheduled UE, and sends the first channel state information reference signal CSI-RS and the first demodulation reference signal on the first time-frequency resource by using the first RRU. The DMRS is configured to send, by using the second RRU, the second channel state information reference signal CSI-RS and the second demodulation reference signal DMRS on the second time-frequency resource, where the first CSI-RS is used to independently schedule the UE for channel measurement, and the first DMRS The method for independently scheduling the UE to perform demodulation data, in the embodiment of the present invention, may send the reference signal on different resources by using different RRUs, so that the independently scheduled user equipment can distinguish the reference signals sent by different RRUs, and the throughput of the user equipment can be improved.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below are only some embodiments of the present invention, Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

FIG. 1 is a schematic diagram of a cell deployment scenario applicable to an embodiment of the present invention.

2 is a schematic flow diagram of a method for data transmission in accordance with one embodiment of the present invention.

3 is a schematic flow chart of a method for data transmission in accordance with another embodiment of the present invention.

4 is a base station in accordance with one embodiment of the present invention.

FIG. 5 is a base station according to another embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of the present invention.

It should be understood that the technical solutions of the embodiments of the present invention can be applied to various communication systems, such as a Wideband Code Division Multiple Access (WCDMA) system, a Long Term Evolution (LTE) system, or a LTE follow-up. Evolution system, etc.

Embodiments of the present invention can be used in wireless networks of different standards. A wireless access network may include different network elements in different systems. For example, the network element of the radio access network in the LTE and LTE subsequent evolution systems includes an evolved NodeB (eNodeB). The embodiment of the present invention is not limited, but for convenience of description, the base station in the following embodiments will be an eNodeB. Give an example for explanation.

It should also be understood that, in the embodiment of the present invention, the user equipment (User Equipment, UE) includes but is not limited to a mobile station (MS), a mobile terminal (MT), a mobile phone (Mobile Telephone), a mobile phone ( And a portable device, the user equipment can communicate with one or more core networks via a Radio Access Network (RAN), for example, the user equipment can be a mobile phone (or A cellular telephone, a computer having a wireless communication function, etc., and the user equipment can also be a portable, portable, handheld, computer built-in or vehicle-mounted mobile device.

It should also be understood that the base station in the embodiment of the present invention may be a wireless distributed base station, and the wireless distributed base station includes a baseband unit (BBU) and a radio remote unit (RRU).

FIG. 1 is a schematic diagram of a cell deployment scenario applicable to an embodiment of the present invention. As shown in Figure 1, the cell deployment scenario includes three RRUs and four UEs, three of which are RRU1, RRU2, and RRU3, and four UEs are UE1, UE2, UE3, and UE4, respectively, where UE1 and UE2 are combined. The scheduling UE, UE3 and UE4 are independently scheduled UEs.

Specifically, UE3 and UE4 only occupy time-frequency resources of a single RRU, that is, RRU3 and RRU2 can separately transmit different data for UE3 and UE4 on the same time-frequency resource, thereby realizing resource multiplexing, that is, UE3 and UE4 respectively receive RRU3. Data sent independently from RRU2 can occupy the same time-frequency resources. UE1 may receive data jointly sent by RRU1 and RRU2, and UE2 may receive data jointly sent by RRU1, RRU2 and RRU3.

It should be understood that the multiple RRU cells in the embodiment of the present invention may include at least two RRUs. The scenario shown in FIG. 1 only shows the case where three RRUs are included in the cell, which is not limited by the embodiment of the present invention.

2 is a schematic flow diagram of a method for data transmission in accordance with one embodiment of the present invention. The method illustrated in Figure 2 can be performed by a base station. Specifically, the method includes:

210. Determine that the user equipment UE located in the cell is an independently scheduled UE, where the independently scheduled UE indicates that the UE is only located within the coverage of the first RRU of the multiple RRUs.

Specifically, the independently scheduled UE may be any one of multiple UEs in the cell, And the independently scheduled UE is located only in the coverage of the first RRU of the plurality of RRUs, wherein the first RRU may include one RRU.

The first RRU sends the first channel state information reference signal CSI-RS and the first demodulation reference signal DMRS on the first time-frequency resource, and sends the second channel state information on the second time-frequency resource by using the second RRU. a reference signal CSI-RS and a second demodulation reference signal DMRS, the first CSI-RS is used for independently scheduling the UE for channel measurement, and the first DMRS is used for independently scheduling the UE to perform demodulation data, wherein the second RRU includes multiple RRUs An RRU other than the first RRU.

In other words, the first RRU and the second RRU are assigned different Channel State Information-Reference Signal (CSI-RS) and Demodulation Reference Signal (DMRS) resources for the first RRU. And transmitting, by the second RRU, the first CSI-RS and the first DMRS and the second CSI-RS and the second DMRS on different time-frequency resources, and further, the UE performs channel measurement according to the first CSI-RS, according to the first DMRS. Demodulation data is performed, wherein the second RRU includes RRUs other than the first RRU among the plurality of RRUs.

Specifically, the second RRU may include at least one RRU.

It should be understood that, since the independent scheduling UE is only located in the coverage of the first RRU, the object PDSCH is sent by the first RRU, so the independent scheduling UE performs channel measurement only according to the first CSI-RS, and only according to the first A DMRS performs demodulation of data so that the reference signal and the channel are matched.

In the existing method, since the RSs of the independently scheduled user equipment are jointly transmitted by multiple RRUs, that is, multiple RRUs transmit RSs on the same time-frequency resource, the independent scheduling UE cannot distinguish the RSs sent by different RRUs, and independently schedules the PDSCH of the UE. The signal strength and signal quality of the RS received by the UE are independently higher than the received signal strength and signal quality of the PDSCH, that is, the RS and PDSCH channels do not match, and the UE performs measurement based on the RS. Demodulated, the throughput of the user equipment will decrease. In the embodiment of the present invention, the reference signal can be sent on different resources by different RRUs, so that the independently scheduled user equipment can distinguish the reference signals sent by different RRUs, and the throughput of the user equipment can be improved.

Optionally, as another embodiment, in 210, the UE determines that the UE is an independently scheduled UE according to multiple Reference Signal Receiving Power (RSRP) of multiple RRUs to UEs in the cell.

Further, as another embodiment, in 210, multiple RSRUs of multiple RRUs to the UE are determined, where multiple RSRPs include RSRPs of each of the multiple RRUs reaching the UE; determining the largest of the multiple RSRPs The RRU corresponding to the RSRP is the first RRU of the UE, and the RRUs of the plurality of RRUs other than the first RRU are the second RRU; when the ratio of the RSRP of the first RRU to the RSRP of all the RRUs of the second RRU is greater than When the threshold is preset, the UE is determined to be an independently scheduled UE.

Optionally, as another embodiment, the method further includes: receiving, by the UE, multiple uplink reference signals corresponding to the multiple RRUs, where the multiple uplink reference signals include an uplink reference corresponding to each of the multiple RRUs. signal,

In 210, the measurement is performed according to the multiple uplink reference signals, and the RSRP of the UE to multiple RRUs is acquired, and multiple RSRPs of multiple RRUs to the UE are determined according to the RSRP of the UE to multiple RRUs.

In other words, in 210, the measurement is performed according to the multiple uplink reference signals, and the uplink RSRP of the UE to the multiple RRUs is obtained; and the multiple RRUs are determined according to the uplink RSRP of the UE to the multiple RRUs. A plurality of downlink RSRPs of the UE.

Specifically, the uplink reference signal may be a Sounding Reference Signal (SRS), and according to an embodiment of the present invention, the base station may determine, according to the uplink reference signal corresponding to the multiple RRUs sent by the UE, the RSRP of the multiple uplink reference signals, and according to The RSRP of the multiple uplink reference signals calculates the equivalent RSRP of each downlink RRU to the UE and arrives as multiple RSRPs of the UEs in the cell by multiple RRUs; the base station arranges the downlink equivalent RSRPs in descending order. The base station determines the working RRU set by calculating the isolation. Specifically, the base station determines the RRU with the strongest RSRP as the A group RRU of the UE; the remaining RRU is determined as the B group RRU, and then the base station calculates the A group RRU. The ratio of the RSRP to the sum of the RSRPs of the Group B RRUs, the ratio is the isolation; afterwards, the base station compares the isolation with a preset threshold (decision threshold), and if the isolation is less than the threshold, the RSRP is The strong RRU is changed from group B to group A, and then the isolation is calculated and compared with the decision threshold. According to this rule, until the isolation is greater than the decision threshold, then this clause is satisfied. The Group A RRU of the piece is the working RRU set of the UE. The base station determines the attributes of the UE according to the number of RRUs in the working RRU set. If the working RRU set of the UE includes only one RRU, the UE is an independently scheduled user equipment, where the one RRU is the first RRU. If there are multiple RRUs in the working RRU set of the UE, the UE is a joint scheduling user.

It should be noted that the (downlink) equivalent RSRP of the RRU to the UE may be equal to the (uplink) of the UE to the RRU, or the equivalent RSRP of the RRU to the UE may be positively correlated with the RSRP of the UE to multiple RRUs. This is not a limitation.

For example, taking UE4 in the scenario of FIG. 1 as an example, UE4 sends an uplink reference signal SRS to RRU1, RRU2, and RRU3, respectively, and the base station determines each one according to an uplink reference signal received for each of RRU1, RRU2, and RRU3. The RSRP of the uplink reference signal received by the RRU, and the RSRP of each of the RRUs arriving at the UE4 is determined according to the RSRP of each uplink reference signal. The three RSRPs of the RRU (RRU1, RRU2, and RRU3) to the UE4 include: RSRP1 corresponding to RRU1, RSRP2 corresponding to RRU2, and RSRP3 corresponding to RRU3. Since RSRP2 is the maximum of the three RSRPs, the initial group A RRU RRU2 is included, and RRU1 and RRU3 are included in the B group RRU, and the ratio of RSRP2 to the sum of RSRP1 and RSRP3 is greater than the decision threshold, that is, the decision condition is satisfied. Therefore, the final group A RRU includes RRU2, and the group B RRU includes RRU1 and RRU3. The RRU (the working RRU set) includes only the RRU2, that is, only one RRU, and the RRU2 is the first RRU, so the UE4 is an independently scheduled UE, and the RRU1 and the RRU3 in the B group are the second RRU.

It should be understood that the preset threshold value may be determined according to the actual situation, and the preset threshold value may also be a preset value. For example, the preset threshold value may be 1, which is not in the embodiment of the present invention. In this embodiment, in the embodiment of the present invention, the RSRP of the A group RRU and the RSRP of the B group RRU may be compared. If the RSRP of the A group RRU is smaller than the RSRP of the B group RRU, the RSRP is used. The second strong RRU is changed from the B group to the A group until the sum of the RSRPs of the group A RRUs is greater than the sum of the RSRPs of the group B RRUs.

Optionally, in another embodiment, in 220, the first CSI-RS and the first DMRS are sent on the first time-frequency resource by using the first RRU according to different signal transmission locations, and the second RRU is in the second time. Transmitting the second CSI-RS and the second DMRS on the frequency resource; or transmitting the first CSI-RS and the first CSI-RS on the first time-frequency resource by using the first RRU according to the number of the Scrambling Code Sequence Identification (NSCID) The first DMRS sends the second CSI-RS and the second DMRS on the second time-frequency resource by using the second RRU.

In other words, the embodiment of the present invention can use TM9 technology for data transmission. Specifically, the base station allocates different CSI-RS and DMRS resources based on each RRU, and the UE performs channel measurement using the CSI-RS, and demodulates data using the DMRS.

Further, as another embodiment, when the value of the NSCID is 0, the first CSI-RS and the first DMRS are sent by the first RRU on the first time-frequency resource, and when the NSCID is 1, Transmitting the second CSI-RS and the second DMRS on the second time-frequency resource by using the second RRU.

Specifically, the base station may allocate different CSI-RS and DMRS resources on different RRUs, so that the user equipment is used to distinguish signals sent by different RRUs. Different RRUs can be distinguished by different transmission locations or NSCIDs. For example, the NSCID can represent different DMRSs by taking a value of 0 or 1. For example, when the value of the NSCID is 0, the base station corresponds to the first RRU, and the base station allocates the first CSI-RS and the first DMRS resource for the first RRU, and corresponds to the second RRU when the NSCID value is 1, and the base station allocates the second RRU. Two CSI-RS and second DMRS resources.

Optionally, as another embodiment, multiple RRUs in the embodiment of the present invention may include two RRUs, where the first RUU and the second RRU respectively include one RRU.

Of course, the embodiment of the present invention is not limited to the case of two RRU cells. The multiple RRUs in the embodiment of the present invention may further include two or more RRUs. For example, multiple RRUs may include three, five, and ten. RRU and so on. Embodiments of the invention are not limited thereto.

Hereinabove, a schematic flow chart of a method for data transmission according to an embodiment of the present invention is described in conjunction with FIGS. 1 and 2. The method for data transmission of the embodiment of the present invention will be described in detail below with reference to the specific example of FIG. 3.

3 is a schematic flow chart of a method for data transmission in accordance with another embodiment of the present invention. As shown in FIG. 3, the method is performed by a base station, and the method includes:

310. Determine multiple RSRPs of multiple RRUs to UEs in a cell, where multiple RSRPs include RSRPs of each of the multiple RRUs to reach the UE.

Specifically, the base station may perform measurement according to multiple uplink reference signals, and acquire an RSRP of the UE to multiple RRUs; and determine multiple RSRPs of multiple RRUs to the UE according to the RSRP of the UE to multiple RRUs. The uplink reference signal may be an SRS.

320. Determine a group A RRU and a group B RRU.

Specifically, the base station arranges the downlink equivalent RSRP in descending order. The base station determines the working RRU set by calculating the isolation. Specifically, the base station determines the RRU with the strongest RSRP as the A group RRU of the UE; the remaining RRU is determined as the B group RRU, and then the base station calculates the A group RRU. RSRP The ratio of the sum of the RSRPs of the group B RRUs is the isolation degree; after that, the base station compares the isolation with a preset threshold (decision threshold), and if the isolation is less than the threshold, the RSRP is stronger. The RRU is changed from Group B to Group A, and then the isolation is calculated and compared with the decision threshold. According to this rule, until the isolation is greater than the decision threshold, the group A RRU that satisfies this condition is also referred to as the working RRU set of the UE.

For example, the three RSRPs in the scenario of FIG. 1 to the three RSRPs of the UE4 include the RSRP1 corresponding to the RRU1, the RSRP2 corresponding to the RRU2, and the RSRP3 corresponding to the RRU3. Since the RSRP2 is the maximum of the three RSRPs, the initial group A RRU is Including RRU2, the group R RRU includes RRU1 and RRU3, and the ratio of RSRP2 to the sum of RSRP1 and RSRP3 is greater than the decision threshold, that is, the decision condition is satisfied. Therefore, the final group A RRU includes RRU2, and the group B RRU includes RRU1 and RRU3.

330. Determine a first RRU and a second RRU.

The base station determines the attributes of the UE according to the number of RRUs in the working RRU set. If the working RRU set of the UE includes only one RRU, the UE is an independently scheduled user equipment, where the one RRU is the first RRU, and the RRU in the B group is the second RRU. If there are multiple RRUs in the working RRU set of the UE, the UE is a joint scheduling user equipment.

For example, in the UE4 corresponding to 320, the RRU2 (the working RRU set) includes only the RRU2, that is, only one RRU, and the RRU2 is the first RRU, and the RRU1 and the RRU3 in the B group are the second RRU.

340. The first channel state information reference signal CSI-RS and the first demodulation reference signal DMRS are sent by using the first RRU on the first time-frequency resource, and the second channel state information is sent by using the second RRU on the second time-frequency resource. The reference signal CSI-RS and the second demodulation reference signal DMRS are used to independently schedule the UE for channel measurement, and the first DMRS is used to independently schedule the UE to perform demodulation data.

Therefore, the embodiment of the present invention determines that the user equipment UE located in the cell is independently scheduled. Transmitting, by the first RRU, the first channel state information reference signal CSI-RS and the first demodulation reference signal DMRS on the first time-frequency resource, and transmitting the second channel state on the second time-frequency resource by using the second RRU The information reference signal CSI-RS and the second demodulation reference signal DMRS, the first CSI-RS is used for independently scheduling the UE to perform channel measurement, and the first DMRS is used for independently scheduling the UE to perform demodulation data, and the embodiment of the present invention may adopt different The RRU sends reference signals on different resources, which enables the independently scheduled user equipment to distinguish the reference signals sent by different RRUs, which can improve the throughput of the user equipment.

In the above, the method for data transmission according to the embodiment of the present invention is described in detail with reference to FIG. 1 to FIG. 3. The base station of the embodiment of the present invention will be described in detail below with reference to FIG. 4 and FIG.

4 is a base station according to an embodiment of the present invention. The base station 400 of FIG. 4 includes a determining unit 410 and a transmitting unit 420.

Specifically, the determining unit 410 is configured to determine that the user equipment UE located in the cell is an independently scheduled UE, where the independently scheduled UE indicates that the UE is only located in the coverage of the first RRU of the multiple RRUs; An RRU sends a first channel state information reference signal CSI-RS and a first demodulation reference signal DMRS on the first time-frequency resource, and sends a second channel state information reference signal CSI on the second time-frequency resource by using the second RRU. The RS and the second demodulation reference signal DMRS, the first CSI-RS is used for independently scheduling the UE to perform channel measurement, and the first DMRS is used for independently scheduling the UE to perform demodulation data, wherein the second RRU includes the first of the plurality of RRUs. RRU outside the RRU.

Optionally, as another embodiment, the determining unit 410 determines that the UE is an independently scheduled UE according to multiple RSRPs of multiple RRUs to UEs in the cell.

Optionally, as another embodiment, the determining unit 410 determines that the multiple RRUs reach multiple RSRPs of the UE, where the multiple RSRPs include an RSRP that each of the multiple RRUs reaches the UE; Determining that the RRU corresponding to the largest RSRP of the multiple RSRPs is the first RRU of the UE, and the RRUs of the plurality of RRUs other than the first RRU are the second RRU; when the RSRP of the first RRU and all the RRUs in the second RRU When the ratio of the sum of RSRPs is greater than a preset threshold, it is determined that the UE is an independently scheduled UE.

Optionally, in another embodiment, the base station further includes: a receiving unit, configured to receive, by the UE, multiple uplink reference signals corresponding to the multiple RRUs, where the multiple uplink reference signals include each of the corresponding multiple RRUs The uplink reference signal of the RRU; wherein the determining unit 410 performs measurement according to the multiple uplink reference signals, and acquires RSRPs of the UE to multiple RRUs; and determines multiple RSRPs of multiple RRUs to the UE according to the RSRP of the UE to multiple RRUs.

Optionally, as another embodiment, the sending unit 420 sends the first CSI-RS and the first DMRS on the first time-frequency resource by using the first RRU according to different signal transmission positions, and the second time-frequency through the second RRU. Transmitting the second CSI-RS and the second DMRS on the resource, or sending the first CSI-RS and the first DMRS on the first time-frequency resource by using the first RRU, and the second time-frequency in the second RRU by using the second RRU The second CSI-RS and the second DMRS are transmitted on the resource.

Optionally, as another embodiment, when the value of the NSCID is 0, the sending unit 420 sends the first CSI-RS and the first DMRS on the first time-frequency resource by using the first RRU, and when the NSCID is 1 The sending unit 420 sends the second CSI-RS and the second DMRS on the second time-frequency resource by using the second RRU.

It should be understood that the base station of FIG. 4 can implement various processes involved in the base station in the methods of FIG. 2 to FIG. 3, and to avoid repetition, details are not described herein.

5 is a base station. As shown in FIG. 5, the base station 500 includes a processor 510, a memory 520, a bus system 530, and a transceiver 540, in accordance with another embodiment of the present invention.

Specifically, the processor 510 calls the code stored in the memory 520 by the bus system 530 to determine that the user equipment UE located in the cell is an independently scheduled UE, where the independently scheduled UE indicates that the UE is located only in the first RRU of the multiple RRUs. The transceiver 540 transmits the first channel state information reference signal CSI-RS and the first demodulation reference signal DMRS on the first time-frequency resource by using the first RRU, and sends the second RRU on the second time-frequency resource. a second channel state information reference signal CSI-RS and a second demodulation reference signal DMRS, the first CSI-RS is used for independently scheduling the UE for channel measurement, and the first DMRS is used for independently scheduling the UE to perform demodulation data, wherein, the second The RRU includes RRUs other than the first RRU among the plurality of RRUs.

The method disclosed in the foregoing embodiments of the present invention may be applied to the processor 510 or implemented by the processor 510. Processor 510 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processor 510 or an instruction in a form of software. The processor 510 may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), or an off-the-shelf programmable gate array (English Field Programmable Gate Array). , referred to as FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps, and logical block diagrams disclosed in the embodiments of the present invention may be implemented or carried out. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present invention may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor. The software module can be located in a random access memory (RAM), a flash memory, a read-only memory (ROM), a programmable read only memory or an electrically erasable programmable memory, a register, etc. In the mature storage medium of the field. The storage medium is located in the memory 520. The processor 510 reads the information in the memory 520 and completes the steps of the foregoing method in combination with hardware. The bus system 530 may include a power bus, a control bus, and a status signal bus in addition to the data bus. Wait. However, for clarity of description, various buses are labeled as bus system 530 in the figure.

Optionally, as another embodiment, the processor 510 determines that the UE is an independently scheduled UE according to multiple RSRPs of multiple RRUs to UEs in the cell.

Optionally, as another embodiment, the processor 510 determines that multiple RRUs reach multiple RSRPs of the UE, where multiple RSRPs include RSRPs of each of the multiple RRUs reaching the UE; determining the largest of the multiple RSRPs The RRU corresponding to the RSRP is the first RRU of the UE, and the RRUs of the plurality of RRUs other than the first RRU are the second RRU; when the RSRP of the first RRU is the second RRU When the ratio of the sum of the RSRPs of all the RRUs in the middle is greater than the preset threshold, it is determined that the UE is an independently scheduled UE.

Optionally, as another embodiment, the transceiver 540 is configured to receive, by the UE, multiple uplink reference signals corresponding to multiple RRUs, where the multiple uplink reference signals include an uplink reference corresponding to each of the multiple RRUs. The processor 510 performs measurement according to the multiple uplink reference signals, acquires the RSRP of the UE to multiple RRUs, and determines multiple RSRPs of multiple RRUs to the UE according to the RSRP of the UE to multiple RRUs.

Optionally, as another embodiment, the transceiver 540 sends the first CSI-RS and the first DMRS on the first time-frequency resource by using the first RRU according to different signal transmission positions, and the second time-frequency through the second RRU. The second CSI-RS and the second DMRS are sent on the resource, or the transceiver 540 sends the first CSI-RS and the first DMRS on the first time-frequency resource by using the first RRU according to the NSCID, and the second RRU is in the first The second CSI-RS and the second DMRS are transmitted on the second time frequency resource.

Optionally, as another embodiment, when the value of the NSCID is 0, the transceiver 540 sends the first CSI-RS and the first DMRS on the first time-frequency resource by using the first RRU, and when the NSCID is 1 The transceiver 540 transmits the second CSI-RS and the second DMRS on the second time-frequency resource by using the second RRU.

It should be understood that the base station of FIG. 5 can implement the processes involved in the base station in the methods of FIG. 2 to FIG. 3, and to avoid repetition, details are not described herein.

It should be noted that the above-described examples are intended to help those skilled in the art to better understand the embodiments of the present invention and not to limit the scope of the embodiments of the present invention. A person skilled in the art will be able to make various modifications or changes in the form of the above-described examples, and such modifications or variations are also within the scope of the embodiments of the present invention.

It should be understood that the size of the sequence numbers of the above processes does not imply a sequence of executions, and the order of execution of the processes should be determined by its function and internal logic, and should not be construed as limiting the implementation process of the embodiments of the present invention.

It is to be understood that the phrase "one embodiment" or "an embodiment" or "an" Thus, "in one embodiment" or "in an embodiment" or "an" In addition, these particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in various embodiments of the present invention, the size of the sequence numbers of the above processes does not mean the order of execution, and the order of execution of each process should be The function and the intrinsic logic are determined without any limitation on the implementation process of the embodiments of the present invention.

Additionally, the terms "system" and "network" are used interchangeably herein. The term "and/or" in this context is merely an association describing the associated object, indicating that there may be three relationships, for example, A and / or B, which may indicate that A exists separately, and both A and B exist, respectively. B these three situations. In addition, the character "/" in this article generally indicates that the contextual object is an "or" relationship.

It should be understood that in the embodiment of the present invention, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B from A does not mean that B is only determined based on A, and that B can also be determined based on A and/or other information.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both, for clarity of hardware and software. Interchangeability, the composition and steps of the various examples have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

A person skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

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

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, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.

In addition, each functional unit in various embodiments of the present invention may be integrated in one processing unit In addition, 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.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented in hardware, firmware implementation, or a combination thereof. When implemented in software, the functions described above may be stored in or transmitted as one or more instructions or code on a computer readable medium. Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another. A storage medium may be any available media that can be accessed by a computer. By way of example and not limitation, computer readable media may comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage media or other magnetic storage device, or can be used for carrying or storing in the form of an instruction or data structure. The desired program code and any other medium that can be accessed by the computer. Also. Any connection may suitably be a computer readable medium. For example, if the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable , fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwave are included in the fixing of the associated media. As used in the present invention, a disk and a disc include a compact disc (CD), a laser disc, a compact disc, a digital versatile disc (DVD), a floppy disk, and a Blu-ray disc, wherein the disc is usually magnetically copied, and the disc is The laser is used to optically replicate the data. Combinations of the above should also be included within the scope of the computer readable media.

In conclusion, the above is only a preferred embodiment of the technical solution of the present invention, and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

A method for data transmission, which is applied to a plurality of radio remote unit RRU common cells, and the method includes:

Determining that the user equipment UE located in the cell is an independently scheduled UE, where the independent scheduling UE indicates that the UE is only located in a coverage area of the first RRU of the multiple RRUs;

Transmitting, by the first RRU, a first channel state information reference signal CSI-RS and a first demodulation reference signal DMRS on a first time-frequency resource, and transmitting, by using the second RRU, a second channel on a second time-frequency resource a status information reference signal CSI-RS and a second demodulation reference signal DMRS, the first CSI-RS being used by the independent scheduling UE to perform channel measurement, and the first DMRS is used by the independent scheduling UE to perform demodulation data The second RRU includes an RRU of the plurality of RRUs other than the first RRU.
The method according to claim 1, wherein the determining that the user equipment UE located in the cell is an independently scheduled UE comprises:

Determining, according to the multiple reference signal received strength RSRPs of the multiple RRUs to the UEs in the cell, that the UE is an independently scheduled UE.
The method according to claim 2, wherein the determining, according to the multiple reference signal received strength RSRPs of the multiple RRUs to the UEs in the cell, the determining that the UE is an independently scheduled UE comprises:

Determining, by the plurality of RRUs, a plurality of RSRPs that reach the UE, where the multiple RSRPs include an RSRP that each of the multiple RRUs reaches the UE;

Determining that the RRU corresponding to the largest RSRP of the plurality of RSRPs is the first RRU of the UE, and the RRUs of the plurality of RRUs other than the first RRU are the second RRU;

When the ratio of the sum of the RSRP of the first RRU and the RSRP of all the RRUs in the second RRU is greater than a preset threshold, determining that the UE is an independently scheduled UE.
The method of claim 3, wherein the method further comprises:

Receiving, by the UE, a plurality of uplink reference signals corresponding to the multiple RRUs, where the multiple uplink reference signals include uplink reference signals corresponding to each of the multiple RRUs,

The determining the plurality of RSRPs of the multiple RRUs to the UE includes:

Performing measurement according to the multiple uplink reference signals, and acquiring an RSRP of the UE to the multiple RRUs;

Determining, according to the RSRP of the UE to the multiple RRUs, multiple RSRPs of the multiple RRUs to the UE.
The method according to any one of claims 1 to 4, characterized in that

Transmitting, by the first RRU, a first channel state information reference signal CSI-RS and a first demodulation reference signal DMRS on the first time-frequency resource, and sending, by using the second RRU, the second time-frequency resource a two channel state information reference signal CSI-RS and a second demodulation reference signal DMRS,

include:

Transmitting, by the first RRU, the first CSI-RS and the first DMRS on the first time-frequency resource according to different signal transmission locations, and transmitting, by using the second RRU, the second CSI-RS and the second CSI-RS on the second time-frequency resource Second DMRS,

or

Transmitting, by the first RRU, the first CSI-RS and the first DMRS on the first time-frequency resource, and sending, by using the second RRU, the second CSI on the second time-frequency resource, according to the difference of the scrambling code sequence number NSCID. -RS and second DMRS.
The method of claim 5 wherein:

Transmitting, by the first RRU, the first CSI-RS and the first DMRS on the first time-frequency resource, and sending, by using the second RRU, the second CSI-RS on the second time-frequency resource, according to the NSCID. And the second DMRS, including:

When the value of the NSCID is 0, the first CSI-RS and the first DMRS are sent by using the first RRU on the first time-frequency resource.

When the NSCID value is 1, the second CSI-RS and the second DMRS are sent by the second RRU on the second time-frequency resource.
A base station, comprising:

a determining unit, configured to determine that the user equipment UE located in the cell is an independently scheduled UE, where the independent scheduling UE indicates that the UE is only located in a coverage area of the first RRU of the multiple RRUs;

a sending unit, configured to send, by using the first RRU, a first channel state information reference signal CSI-RS and a first demodulation reference signal DMRS on the first time-frequency resource, and using the second RRU in the second time-frequency resource Transmitting, on the second channel state information reference signal CSI-RS and the second demodulation reference signal DMRS, the first CSI-RS is used for the independent scheduling UE to perform channel measurement, and the first DMRS is used for the independent scheduling The UE performs demodulation data, wherein the second RRU includes An RRU of the plurality of RRUs other than the first RRU.
The base station according to claim 7, wherein

The determining unit determines, according to the multiple RSRUs of the multiple RRUs to the UEs in the cell, that the UE is an independently scheduled UE.
The base station according to claim 8, wherein

Determining, by the determining unit, the multiple RSRUs that reach the multiple RSRPs of the UE, where the multiple RSRPs include an RSRP that each of the multiple RRUs reaches the UE; determining the multiple RSRPs The RRU corresponding to the largest RSRP is the first RRU of the UE, and the RRUs other than the first RRU of the multiple RRUs are the second RRU; when the RSRP of the first RRU is When the ratio of the sum of the RSRPs of all the RRUs in the second RRU is greater than a preset threshold, determining that the UE is an independently scheduled UE.
The base station according to claim 9, further comprising:

a receiving unit, configured to receive, by the UE, multiple uplink reference signals corresponding to the multiple RRUs, where the multiple uplink reference signals include uplink reference signals corresponding to each of the multiple RRUs,

The determining unit performs measurement according to the multiple uplink reference signals, acquires an RSRP of the UE to the multiple RRUs, and determines, according to the RSRP of the UE to the multiple RRUs, the multiple RRUs to the A plurality of RSRPs of the UE.
A base station according to any one of claims 7 to 10, characterized in that

Transmitting, by the sending unit, the first CSI-RS and the first DMRS on the first time-frequency resource by using the first RRU, and sending the second second-frequency resource on the second time-frequency resource by using the second RRU. CSI-RS and second DMRS,

Or sending, according to the NSCID, the first CSI-RS and the first DMRS on the first time-frequency resource by using the first RRU, and sending the second CSI-RS and the second CSI-RS on the second time-frequency resource by using the second RRU. Second DMRS.
The base station according to claim 11, wherein

When the value of the NSCID is 0, the sending unit sends the first CSI-RS and the first DMRS on the first time-frequency resource by using the first RRU.

When the value of the NSCID is 1, the sending unit sends the second CSI-RS and the second DMRS on the second time-frequency resource by using the second RRU.