CN107852702B

CN107852702B - Space division multiplexing processing method, device and equipment

Info

Publication number: CN107852702B
Application number: CN201580081716.1A
Authority: CN
Inventors: 杨晓; 尚政; 李永茂
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2015-08-14
Filing date: 2015-08-14
Publication date: 2020-04-21
Anticipated expiration: 2035-08-14
Also published as: CN107852702A; WO2017028059A1

Abstract

The invention provides a space division multiplexing processing method, a device and equipment, wherein the space division multiplexing processing method is applied to a multi-antenna system and comprises the following steps: determining a combined pre-coding weight value among cells according to channel state information of user terminals accessed to each cell; and weighting the cell-level pilot frequency and the control channel of each cell by adopting the inter-cell combined precoding weight so as to realize space division multiplexing of the inter-cell control channel. The space division multiplexing processing method, the space division multiplexing processing device and the space division multiplexing processing equipment realize space division multiplexing of the control channel and solve the problem of limited capacity of the control channel.

Description

Space division multiplexing processing method, device and equipment

Technical Field

The present invention relates to wireless communication technologies, and in particular, to a spatial multiplexing processing method, apparatus, and device.

Background

Multiple antennas are also known as array antennas. It is composed of multiple array elements arranged in space according to a certain geometrical shape. Each array element can independently receive and transmit signals. The Multi-antenna technology is mainly classified into two major types, i.e., MIMO (Multi-Input and Multi-Output) technology and smart antenna technology. Nowadays, it is well known by those skilled in the art that multi-antenna technology is the mainstream technology to be used in future mobile communication systems (3G, B3G, 4G and LTE) and broadband wireless access systems. Its advantages are high system capacity, high utilization rate of frequency spectrum and high signal transmission speed.

In a multi-antenna system, cells are divided based on antenna positions, each cell covers a certain range, and terminal equipment located in the coverage range of the cell is accessed into the cell in which the terminal equipment is located. The terminal device may demodulate the control channel of the cell to obtain the basic information of the data channel, for example, may obtain the control information such as the modulation and coding scheme and the resource allocation scheme, and then demodulate the data channel according to the control information, so as to communicate with the corresponding antenna in the accessed cell.

Disclosure of Invention

The embodiment of the invention provides a space division multiplexing processing method, a space division multiplexing processing device and space division multiplexing processing equipment, which are used for solving the problem that the capacity of a control channel is limited in a multi-antenna system.

In a first aspect, an embodiment of the present invention provides a spatial division multiplexing processing method, where the method is applied to a multiple-antenna system, and the method includes:

determining a combined pre-coding weight value among cells according to channel state information of user terminals accessed to each cell;

and weighting the cell-level pilot frequency and the control channel of each cell by adopting the inter-cell combined precoding weight so as to realize space division multiplexing of the inter-cell control channel.

Optionally, the method further includes: weighting the data channels of the cells by adopting the inter-cell combined precoding weight to realize space division multiplexing of the data channels;

alternatively, the first and second electrodes may be,

and weighting the data channel and the user-level pilot frequency by adopting the inter-cell combined precoding weight value to realize space division multiplexing of the data channel.

Optionally, at most one user terminal is accessed in each cell.

Optionally, the number of the user terminals accessed in each cell is greater than one; the method further comprises the following steps: carrying out frequency division or time division processing on control channels of all user terminals in the same cell;

and carrying out frequency division or time division processing on the data channels of all the user terminals in the same cell.

Optionally, before weighting the cell-level pilot frequency and the control channel of each cell by using the inter-cell joint precoding weight, the method further includes:

and carrying out user-level scrambling corresponding to each terminal device on the cell-level pilot frequency sent to each user terminal.

Optionally, the weighting the cell-level pilot frequency and the control channel of each cell by using the inter-cell joint precoding weight to implement space division multiplexing of the inter-cell control channel includes:

determining transmitting antennas corresponding to each cell according to the inter-cell combined precoding weight;

weighting the cell-level pilot frequency and the control channel to be transmitted by adopting the inter-cell combined pre-coding weight value;

and transmitting the weighted cell-level pilot frequency and the weighted control channel on the transmitting antenna corresponding to each cell.

Optionally, each cell at least includes one frequency division cell, where the frequency division cell includes at least two sub-cells, frequency bands of the at least two sub-cells are not overlapped with each other, and at most one user terminal is accessed in each sub-cell;

correspondingly, the determining the inter-cell joint precoding weight according to the channel state information of the user terminal accessing each cell includes:

determining inter-cell joint precoding between the sub-cell and a cell having an overlapping frequency band with the sub-cell according to channel state information of user terminals accessed in the sub-cell and the cell having the overlapping frequency band with the sub-cell;

the weighting the cell-level pilot frequency and the control channel of each cell by adopting the inter-cell joint precoding weight comprises the following steps:

and weighting the cell-level pilot frequency and the control channel of the sub-cell and the cell-level pilot frequency and the control channel of the cell by adopting the inter-cell combined precoding weight.

Optionally, before determining the inter-cell joint precoding weight according to the channel state information of the user terminal accessing each cell, the method further includes:

and dividing at least one cell in each cell into at least two sub-cells according to the number of the user terminals in the access cell and/or the service state information of the user terminals to form the frequency division cell.

Optionally, each cell at least includes one time division cell, where the time division cell includes at least two sub-cells, transmission timeslots of the at least two sub-cells are not overlapped with each other, and at most one user terminal is accessed to each sub-cell;

determining the sub-cell and inter-cell joint precoding between the sub-cells and the cells according to the channel state information of the user terminals accessed in the sub-cells and the sub-cells in the transmission time slot of the sub-cell;

and dividing at least one cell in each cell into at least two sub-cells according to the integral multiple of the time slot according to the number of the user terminals in the access cell and/or the service state information of the user terminals to form the time division cell.

Optionally, the time division cell includes two sub-cells, where one sub-cell and the cell perform space division multiplexing on an odd time slot, and the other sub-cell and the cell perform space division multiplexing on an even time slot.

In a second aspect, an embodiment of the present invention provides a spatial division multiplexing processing apparatus, where the apparatus is applied to a multiple antenna system, and the apparatus includes:

a determining module, configured to determine a joint pre-coding weight between cells according to channel state information of a user terminal accessing each cell;

and the first space division multiplexing module is used for weighting the cell-level pilot frequency and the control channel of each cell by adopting the inter-cell joint precoding weight so as to realize space division multiplexing of the inter-cell control channel.

Optionally, the apparatus further comprises: the second space division multiplexing module is used for weighting the data channels of the cells by adopting the inter-cell joint precoding weight to realize space division multiplexing of the data channels; or, the inter-cell joint precoding weight is adopted to weight the data channel and the user-level pilot frequency, so as to realize space division multiplexing of the data channel.

Optionally, at most one user terminal is accessed in each cell.

Optionally, the number of the user terminals accessed in each cell is greater than one; the device further comprises:

the frequency division and time division processing module is used for carrying out frequency division or time division processing on the control channels of all the user terminals in the same cell; and carrying out frequency division or time division processing on the data channels of all the user terminals in the same cell.

Optionally, the apparatus further comprises: and a scrambling module, configured to perform user-level scrambling corresponding to each terminal device on the cell-level pilot frequency sent to each user terminal before the first space division multiplexing module weights the cell-level pilot frequency and the control channel of each cell by using the inter-cell joint precoding weight.

Optionally, the first space division multiplexing module includes:

an antenna determining unit, configured to determine, according to the inter-cell joint precoding weight, a transmitting antenna corresponding to each cell;

the weighting processing unit is used for weighting the cell-level pilot frequency and the control channel to be sent by adopting the inter-cell joint pre-coding weight value;

and the sending unit is used for sending the weighted cell-level pilot frequency and the weighted control channel on the transmitting antenna corresponding to each cell.

correspondingly, the determining module is configured to determine inter-cell joint precoding between the sub-cell and the cell having the overlapping frequency band with the sub-cell according to channel state information of user terminals accessed to the sub-cell and the cell having the overlapping frequency band with the sub-cell;

and the space division multiplexing module is used for weighting the cell-level pilot frequency and the control channel of the sub-cell and the cell-level pilot frequency and the control channel of the cell by adopting the inter-cell joint precoding weight.

Optionally, the apparatus further comprises: and the frequency division cell division module is used for dividing at least one cell in each cell into the at least two sub-cells according to the frequency band according to the number of the user terminals in the accessed cell and/or the service state information of the user terminals before the determination module determines the inter-cell combined precoding weight according to the channel state information of the user terminals accessed to each cell, so as to form the frequency division cell.

correspondingly, the determining module is configured to determine, in a transmission timeslot of a sub-cell, joint precoding between the sub-cell and a cell between the sub-cell and the cell according to channel state information of user terminals accessed to the sub-cell and the cell;

Optionally, the apparatus further comprises: and the time division cell division module is used for dividing at least one cell in each cell into the at least two sub-cells according to integral multiple of time slots according to the number of the user terminals in the accessed cell and/or the service state information of the user terminals before the determination module determines the inter-cell joint precoding weight according to the channel state information of the user terminals accessed to each cell, so as to form the time division cell.

Optionally, the space division multiplexing module is further configured to, when the time-division cell includes two sub-cells, perform space division multiplexing on one sub-cell and the cell at an odd timeslot, and perform space division multiplexing on the other sub-cell and the cell at an even timeslot.

In a third aspect, an embodiment of the present invention provides an access device, where the access device is applied in a multiple antenna system, and the access device includes:

a communication interface, a memory, and a processor and a communication bus, wherein the communication interface, the memory, and the processor communicate over the communication bus;

the memory is used for storing programs, and the processor is used for executing the programs stored in the memory; when the space division multiplexing processing apparatus is running, the processor runs a program including:

Optionally, the device is an enhanced base station eNB in an LTE system, a WiFi wireless access point AP in a wireless fidelity system, or a base station BS in a worldwide interoperability for microwave access WiMAX.

In the space division multiplexing processing method, device and equipment of the embodiment of the invention, the weighted cell-level pilot frequency and the weighted control channel are sent to the UE of each cell, space division multiplexing of the control channel is realized through the control of the inter-cell combined precoding weight, and the problem of limited capacity of the control channel is solved.

Drawings

Fig. 1 is a schematic diagram of a network architecture of a multi-antenna system in the prior art;

fig. 2 is a schematic diagram of space division multiplexing of data channels in the network architecture shown in fig. 1;

fig. 3 is a schematic diagram of a possible structure of a multi-antenna system applied in the embodiment of the present invention;

fig. 4 is a schematic diagram illustrating cell type conversion in a multi-antenna system according to an embodiment of the present invention;

fig. 5 is a flowchart of a space division multiplexing processing method according to a first embodiment of the present invention;

FIG. 6 is a diagram illustrating data weighting according to an embodiment of the present invention;

fig. 7 is a schematic diagram of a specific implementation of frequency division multiplexing based on space division multiplexing in a sixth embodiment of the method of the present invention;

fig. 8 is a schematic diagram of a specific implementation of time division multiplexing based on space division multiplexing in a seventh embodiment of the method of the present invention;

fig. 9 is a schematic structural diagram of a space division multiplexing processing apparatus according to a first embodiment of the present invention;

fig. 10 is a schematic structural diagram of an access device according to a first embodiment of the present invention.

Detailed Description

The multi-antenna technology has many advantages such as large system capacity, high spectrum utilization rate, and fast signal transmission rate, and becomes an important direction for the development of future mobile communication systems and broadband wireless access systems. For example, MIMO technology has become a key technology in LTE (Long Term Evolution) system and significantly increases the spectrum efficiency and data transmission rate of the system.

In order to realize reasonable allocation of system resources and reasonable scheduling of user services, a cell division mode is adopted in a multi-antenna system to enable UE to be accessed into the multi-antenna system.

In the multi-antenna system, one way of cell division is to divide cells based on the antenna setting positions, each cell has a certain signal coverage, and UEs located in the coverage of the same cell are all accessed to the same cell in which the UE is located.

After the UE accesses the cell, the UE may demodulate the control channel of the cell to obtain control information of the data channel, for example, may obtain control information such as a modulation and coding scheme and a resource allocation scheme, and then demodulate the data channel according to the control information, so as to communicate with a corresponding antenna in the accessed cell.

Fig. 1 shows a schematic diagram of a network architecture of a multi-antenna system in the prior art. Taking user 0 and user 5 in fig. 1 as an example, user 0 and user 5 are located in the signal coverage of cell 0 and cell 2, respectively, and user 0 and user 5 are accessed to cell 0 and cell 2, respectively. In communication, user 0 and user 5 receive a control channel and a data channel, respectively, from the cell in which they are located.

In order to improve the user capacity of the system, the multi-antenna system can adopt inter-cell joint precoding to perform space division multiplexing of a multi-user data channel, wherein the weight used by the inter-cell joint precoding can be generated according to the state information of the user channel participating in space division multiplexing.

Specifically, fig. 2 is a schematic diagram illustrating space division multiplexing of data channels in the network architecture shown in fig. 1.

In fig. 2, still taking user 0 and user 5 as an example, user 0 and user 5 are respectively one user terminal in cell 0 and cell 2, user 0 and user 5 respectively receive control channels from their respective cells, and data channels are from cell 0 to cell 2, so that space division multiplexing of the data channels is implemented.

Therefore, the above-mentioned cell division can adopt an inter-cell joint precoding mode to realize space division multiplexing of data channels, and the control channel still needs to perform natural space division multiplexing in an inter-cell space isolation mode.

The cell-level pilots of different cells are all different, and the user-level pilots of different UEs are all different. The demodulation of the Control Channel is generally based on a Cell-level pilot, for example, the PDCCH (Physical Downlink Control Channel) in LTE R8/9/10 is based on CRS (Cell Reference Signal). The data Channel demodulation may be based on a cell-level pilot, such as PDSCH (Physical downlink shared Channel) under TM4 in LTE R8/9/10, or based on a user-level pilot, such as PDSCH under TM7 in LTE R8/9/10.

Because the capacity of the control channel of each cell is limited (for example, the PDCCH in LTE R8/9/10 can only use 3 symbols at most), if the control channel also wants to perform joint precoding across cells, the same joint precoding must be performed on cell-level pilots in order to demodulate the control channel, and at this time, if multiple UEs in one cell all participate in space division multiplexing, since the UEs in the cell use the same cell-level pilots, they cannot be distinguished by precoding weights, interference may exist in channel estimation of the pilots, which affects accuracy of channel estimation, and finally, the demodulation performance of the control channel is reduced or even demodulation cannot be performed, so that the control channel cannot perform space division multiplexing by performing joint precoding across cells, that is, the capacity of the control channel cannot be increased by precoding weights.

As mentioned above, the data channel can be demodulated based on the user-level pilot, and since the user-level pilots of each UE are different, there is no problem of cell-level pilot channel estimation, and as the number of antennas increases, the number of UEs that can be multiplexed by joint precoding also increases, but since the control channel cannot be similarly multiplexed, the capacity of the control channel will limit the number of UEs that can be multiplexed.

The pilot overhead for this system is increased because the data channel uses user-level pilots, resulting in both user-level and cell-level pilots in the system.

In order to solve the problem that the space division multiplexing of the control channel is difficult to realize, a new cell division mode can be adopted in the multi-antenna system. Different from the above-mentioned division mode, in this new division mode, antennas are not fixedly grouped according to cells, antennas used by each cell are determined by a joint precoding weight, wherein the joint precoding weight is generated according to the channel state information of users participating in space division multiplexing, the cell will move along with the movement of the UE, and besides, the number of UEs allowed to access by the cell is further limited.

Fig. 3 shows a schematic diagram of a possible structure of a multi-antenna system to which the embodiment of the present invention is applied.

As can be seen from fig. 3, when it is limited that there is at most one UE in each cell, that is, there is only one UE in each of cell 0, cell 1, and cell 2, that is, there is only one UE in user 0, user 1, and user 2, respectively, it is equivalent to reducing the coverage area of each cell, and achieving user-level accurate coverage, at this time, since each cell has only one UE, cell-level pilot frequency can perform full-band space division multiplexing through joint precoding between cells, there is no problem of channel estimation of original system cell-level pilot frequency, so that a control channel and a data channel can be multiplexed based on cell-level pilot frequency through joint precoding between cells, which not only solves the problem of limited space division capacity of the control channel, but also solves the problem of user-level pilot overhead.

In the embodiment of the invention, the cell can be divided into two cells according to the number of the accessed UE in the cell, the cell without the accessed UE is called an idle cell, and the cell with the accessed UE is called a non-idle cell. As shown in fig. 4, which is a schematic diagram illustrating cell type conversion in a multi-antenna system applied in the embodiment of the present invention, it can be seen from fig. 4 that an idle cell can be used for accessing new UE, and when a new UE in the idle cell becomes a non-idle cell; and for the same reason, when the non-idle cell interrupts the access of all the UE, the cell becomes the idle cell.

Based on the cell architecture description of the multi-antenna system, the embodiment of the present invention provides a space division multiplexing processing method, in which inter-cell joint precoding weights are determined according to channel state information of UEs accessing each cell, and data to be transmitted may be weighted according to the inter-cell joint precoding weights, for example, cell-level pilots and control channels of each cell are weighted, and the weighted cell-level pilots and control channels are transmitted to corresponding cells, thereby implementing space division multiplexing of the control channels and solving the problem that the control channels are difficult to perform space division multiplexing in the prior art.

Specifically, the embodiment of the present invention provides an implementation of the following space division multiplexing processing method.

The embodiment of the invention can be applied to communication systems such as a cellular system, WiFi, WiMAX and the like, and correspondingly, the network elements related to the embodiment of the invention are a long term evolution Base Station LTE eNB, a WiFi AP (wireless Access point in a wireless fidelity system), a WiMAX BS (Base Station of Worldwide interoperability for Microwave Access) and the like. For convenience, the following embodiments are described with respect to an LTE eNB as an example.

Example one

As shown in fig. 5, the main execution body of the method of this embodiment may be an LTE eNB, and the main processing steps include:

step S11: and determining the inter-cell combined precoding weight according to the channel state information of the UE accessed to each cell.

In this step, the eNB determines the inter-cell joint precoding weight according to the channel state information of the UE accessed in each cell.

Step S12: and weighting the cell-level pilot frequency and the control channel of each cell by adopting the inter-cell joint precoding weight so as to realize space division multiplexing of the control channel among the cells.

In this step, the eNB sends the weighted cell-level pilot frequency and the weighted control channel to the UE in each cell, and realizes space division multiplexing of the control channel by controlling the inter-cell joint precoding weight, thereby solving the problem of limited capacity of the control channel.

In this embodiment, preferably, the eNB does not perform fixed grouping on the antennas according to the cells, the antenna used by each cell is determined by the inter-cell joint precoding weight, the weight is generated according to the channel state information of the UE participating in space division multiplexing, and the cell moves along with the movement of the user.

Fig. 6 shows a specific example of space division multiplexing a control channel by using inter-cell joint coding weights, where the example includes user 0 and user 1, user 0 belongs to cell 0, user 1 belongs to cell 1, and the two users perform joint precoding through n antennas; before the eNB sends data to each user through an antenna, the eNB multiplies the sent data by a corresponding coefficient according to the weight of the joint precoding, for example, the data sent to the user 0 by the antenna 0 is multiplied by the weight W0,0, and the coefficients corresponding to all the antennas constitute the joint precoding weight, as long as the coefficient on a certain antenna is not 0, it indicates that the cell where the user is located uses the antenna, and the user realizes the space division multiplexing process in the process of receiving the data sent by the antenna whose coefficient is not 0, and especially when the weighted data is cell-level pilot and control channel, the space division multiplexing of the control channel can be realized.

In addition, after the UE accesses the cells divided based on the antenna positions, if the UE moves, the UE may face technical problems of communication blocking and interruption caused by cell switching, but the process of determining the precoding right in this embodiment is a process of selecting an antenna by the UE, and this process is performed by the eNB for the UE, that is, although an antenna used by one cell may be changed all the time, the UE still looks like the same cell, so that the problem of communication blocking and interruption caused by UE moving cell switching in the prior art is solved without cell switching.

Example two

And according to the type of the transmitted data, dividing a UE channel into a data channel and a control channel, wherein the control channel is used for transmitting control information of the UE, and the data channel is used for transmitting service data of the UE. In the embodiment, in the process of implementing space division multiplexing by the control channel, the data channel may also perform space division multiplexing based on the inter-cell joint precoding weight. At the UE side, the UE obtains basic information (such as modulation and coding scheme, resource allocation scheme, etc.) of the data channel by demodulating the control channel, and demodulates the data channel according to the information.

The execution subject of the method of this embodiment may be eNB, and the method for space division multiplexing of the inter-cell control channel is the same as the implementation method of the first embodiment, and is not described again. The method for performing space division multiplexing on a data channel based on the inter-cell joint precoding weight in the embodiment comprises the following steps:

when the eNB performs space division multiplexing on the data channel, the data sent to the UE comprises user-level pilot frequency, the user-level pilot frequency and the data channel of each UE are weighted by using the inter-cell joint pre-coding weight value, and the weighted data is sent to each UE, so that the data channel realizes space division multiplexing based on the user-level pilot frequency. And when the UE demodulates, the UE demodulates the data channel based on the user-level pilot frequency.

And if the user-level pilot frequency does not exist in the data sent to the UE, weighting the data channel of each cell by adopting the inter-cell joint precoding weight to realize space division multiplexing of the data channel. When the UE demodulates, the data channel is demodulated based on the cell-level pilot frequency.

In the embodiment, the control channel and the data channel are demodulated simultaneously, so that the problem that the user capacity is limited in a multi-antenna system can be effectively solved.

EXAMPLE III

In order to further solve the problem of user-level pilot overhead in addition to the problem of limited capacity of a control channel, the embodiment employs a cell network architecture as shown in fig. 3, and it is limited that at most one UE is accessed in each cell, that is, an eNB does not perform fixed grouping on antennas according to cells, and an antenna used in each cell is determined by an inter-cell joint precoding weight, where the inter-cell joint precoding weight is generated according to UE channel state information participating in space division multiplexing, a cell moves along with the movement of the UE, and at most one user is accessed in one cell. In any transmission mode, the physical channel and the physical signal in each cell may be space division multiplexed by inter-cell joint precoding weights, where the physical channel may include: a PBCH (Physical broadcast Channel), a PCFICH (Physical Control format Indicator Channel), a PHICH (Physical Hybrid Indicator Channel), a PDCCH (Physical Downlink Control Channel), a PDSCH (Physical Downlink Shared Channel); the physical signals may include: PSS (Primary Synchronization Signal), SSS (Secondary Synchronization Signal), CRS (Cell Reference Signal), DMRS (modulation Reference Signal).

In addition, since the CRS of the LTE Cell is determined by the PCI (Physical-layer Cell Identity), the PCIs of the cells in which all UEs participating in space division multiplexing are located need to be different.

The specific manner of space division multiplexing of the inter-cell control channel in this embodiment is as described in the first embodiment, and is not described again.

In this embodiment, in addition to space division multiplexing of the control channels of each cell, space division multiplexing of the data channels of each cell may also be performed, where the method for space division multiplexing of the control channels and the data channels of each cell is described in embodiment two and is not described again.

Example four

In this embodiment, the eNB does not perform fixed grouping on the antennas according to the cells, and the antennas used by each cell are determined by the inter-cell joint precoding weight, where the inter-cell joint precoding weight is generated according to the UE channel state information participating in space division multiplexing, but different from the cell network architecture shown in fig. 3, the number of UEs accessed in each cell is greater than one.

When the number of the accessed UE in each cell is more than one, in order to realize space division multiplexing of control channels among the cells, the eNB not only adopts the inter-cell joint precoding weight to weight the cell-level pilot frequency and the control channels of each cell to realize space division multiplexing of the control channels among the cells, but also further carries out frequency division or time division processing on the control channels of each UE in the same cell, thereby enabling each UE to receive data corresponding to the service of the UE; and the data channels of each UE in the same cell are processed by frequency division or time division, thereby realizing the space division multiplexing of the data channels based on the cell-level pilot frequency.

EXAMPLE five

The number of PCIs in the LTE system is only 504, and under the condition that the number of antennas is not limited, if the scheme of the third embodiment is adopted, the number of UEs that can be multiplexed in the multi-antenna system does not exceed 504, and on the premise of not increasing the number of PCIs, user-level scrambling may be performed on a physical channel and a physical signal, where the physical channel may include: PBCH, PCFICH, PHICH, PDCCH, PDSCH; the physical signals may include: PSS, SSS, CRS and DMRS, so even though the PCI of two cells is the same, the CRS is different, thereby the space division multiplexing can be carried out based on the CRS to achieve the purpose of increasing the number of multiplexing users.

In this embodiment, the manner of performing user-level scrambling on the physical channel and the physical signal may be: before weighting the cell-level pilot frequency and the control channel of each cell by adopting the inter-cell joint precoding weight, carrying out user-level scrambling corresponding to each terminal device on the cell-level pilot frequency sent to each UE, wherein the user-level scrambling needs to ensure that scrambling sequences of each UE are different, the scrambling sequences can be determined in advance, for example, the scrambling sequences are generated according to C-RNTI of the UE, or the scrambling sequences can be informed to the UE by an eNB sending RRC signaling, the scrambling effective time can be informed to the UE by the eNB sending signaling, and the two signaling can be independent or can be combined together.

When the data channel is space division multiplexed based on the cell-level pilot, the same method as above can be used to perform user-level scrambling on the data channel.

In this embodiment, the number of UEs accessed in a cell is not limited, and especially when the number of UEs accessed in each cell is greater than one, the method of this embodiment is used to perform user-level scrambling on physical channels and physical signals sent to UEs in the same cell.

EXAMPLE six

In this embodiment, a cell network architecture as shown in fig. 3 is adopted, and it is limited that at most one UE is accessed in each cell, that is, an eNB does not perform fixed grouping on antennas according to cells, and an antenna used in each cell is determined by an inter-cell joint precoding weight, where the inter-cell joint precoding weight is generated according to UE channel state information participating in space division multiplexing, a cell moves along with the movement of the UE, and at most one user is accessed in one cell.

Based on the third embodiment, because the number of the antennas or the number of the PCIs is limited, the number of the cells under the full-band space division multiplexing is limited, that is, the number of the last multiplexed users is limited, and in order to multiplex more users, frequency division can be simultaneously adopted on the basis of space division, and the specific frequency division scheme is as follows:

each cell at least comprises a frequency division cell, the frequency division cell comprises at least two sub-cells, the frequency bands of the at least two sub-cells are not overlapped, and at most one UE is accessed into each sub-cell.

Correspondingly, determining a joint precoding weight value among cells according to the channel state information of the UE accessing each cell, comprising: and determining inter-cell joint precoding between the sub-cell and the cell with the overlapped frequency band with the sub-cell according to the channel state information of the UE accessed into the sub-cell and the UE accessed into the cell with the overlapped frequency band with the sub-cell.

After the eNB determines the inter-cell joint precoding between the sub-cell and the cell with the overlapped frequency band with the sub-cell, the inter-cell joint precoding weight is utilized to weight the cell-level pilot frequency and the control channel of the sub-cell and the cell-level pilot frequency and the control channel of the cell, so that space division multiplexing of the control channel is realized on the overlapped frequency band of the sub-cell and the corresponding cell.

The generation method of the sub-cells in each frequency division cell includes: before determining the inter-cell combined precoding weight according to the channel state information of the UE accessed to each cell, the eNB divides at least one cell in each cell into at least two sub-cells according to the frequency band according to the number of the UE accessed to the cell and/or the service state information of the UE to form a frequency division cell.

If the original space division multiplexing cell bandwidth is not the basic bandwidth of 1.25M or 1.4M, the eNB may change one or more original cells into a plurality of new cells with bandwidth smaller than the original cells according to the number of UEs and the service condition of the UEs. After the original cell is changed into a plurality of new cells, the frequency bands used by the new cells are not overlapped, the new cells can use the PCI of the original cell, or if the PCI is not limited, each new cell can use the unallocated PCI, and each cell only corresponds to one user at most.

As shown in fig. 7, a cell 0 and a cell 1 are respectively cells with a bandwidth of 20M, and one of the 20M cells may become 2 10M cells after frequency division, for example, frequency-dividing a cell 1 into a sub-cell 1 and a sub-cell 2. The cell 0 and the sub-cell 1 can perform space division multiplexing of joint precoding on the overlapped frequency band, and precoding weights are generated according to channel state information of two UEs in the cell 0 and the sub-cell 1; the cell 0 and the sub-cell 2 can perform space division multiplexing of joint precoding on the overlapped frequency band, and the precoding weight is generated according to the channel state information of two UEs in the cell 0 and the sub-cell 2.

EXAMPLE seven

Based on the third embodiment, because the number of antennas or the number of PCIs is limited, the number of cells under space division multiplexing is limited, that is, the number of users multiplexed at last is limited, and in order to multiplex more users, time division can be simultaneously adopted on the basis of space division, and a specific frequency division scheme is as follows:

each cell at least comprises a time division cell, the time division cell comprises at least two sub-cells, the transmission time slots of the at least two sub-cells are not overlapped, and at most one UE is accessed into each sub-cell; correspondingly, determining a joint precoding weight value among cells according to the channel state information of the UE accessing each cell, comprising: determining the sub-cell and inter-cell joint precoding between the sub-cells according to the channel state information of UE (user equipment) accessed into the sub-cells and the sub-cells in the transmission time slot of the sub-cells; weighting the cell-level pilot frequency and the control channel of each cell by adopting the inter-cell combined precoding weight, comprising the following steps: and weighting the cell-level pilot frequency and the control channel of the sub-cell and the cell-level pilot frequency and the control channel of the cell by adopting the inter-cell combined precoding weight.

Before determining the inter-cell joint precoding weight according to the channel state information of the UE accessing each cell, the method further comprises the following steps: and dividing at least one cell in each cell into at least two sub-cells according to the integral multiple of the time slot according to the number of the UE in the access cell and/or the service state information of the UE to form a time division cell.

The time division cell comprises two sub-cells, wherein one sub-cell and the cell are subjected to space division multiplexing on an odd time slot, and the other sub-cell and the cell are subjected to space division multiplexing on an even time slot.

As shown in fig. 8, the original cell 0 and the original cell 1 may perform space division multiplexing of joint precoding in each time slot, where the precoding weight is generated according to channel state information of two UEs in the cell 0 and the cell 1. In this example, one of the cells is time-divided, for example, the cell 1 is time-divided to obtain the sub-cell 1 and the sub-cell 2, the cell 0 and the sub-cell 1 after time division, the cell 0 and the sub-cell 2 may be space division multiplexed in different time slots respectively, for example, the cell 0 and the sub-cell 1 may be space division multiplexed with joint precoding in even time slots, the precoding weight is generated according to the channel state information of the two UEs in the cell 0 and the sub-cell, the cell 0 and the sub-cell 2 may be space division multiplexed with joint precoding in odd time slots, and the precoding weight is generated according to the channel state information of the two UEs in the cell 0 and the sub-cell 2.

PSS/SSS/PBCH in an LTE system is periodically transmitted in fixed TTIs, and if the time division scheme is adopted at the moment, some UEs cannot receive the PSS/SSS/PBCH in certain TTIs, so that the performance is influenced; at this time, the transmission period of the PSS/SSS/PBCH may be modified, for example, the PSS/SSS/PBCH may be transmitted in each TTI, so as to reduce the probability that the PSS/SSS/PBCH cannot be received as much as possible.

In the first to seventh embodiments, the weighting is performed on the cell-level pilot frequency and the control channel of each cell by using the inter-cell joint precoding weight to implement space division multiplexing of the inter-cell control channel, including: determining transmitting antennas corresponding to each cell according to the inter-cell combined precoding weight; weighting the cell-level pilot frequency and the control channel to be transmitted by adopting the inter-cell combined pre-coding weight value; and transmitting the weighted cell-level pilot frequency and the weighted control channel on the transmitting antenna corresponding to each cell.

In addition, the same method can be adopted for data channel and user-level pilot weighting, and is not described again.

In addition, in the LTE system, since there are only 504 PCIs, under the condition that the number of antennas is not limited, the number of multiplexed users does not exceed 504 users on the basis of the third embodiment, and in order to solve the problem of PCI limitation, in addition to the user-level scrambling, frequency division, and time division methods described in the fifth, sixth, and seventh embodiments, a method of increasing the number of PCIs also adopted, so that under the condition that the number of antennas is not limited, more users can be multiplexed.

In LTE systems PCI is determined by PSS and SSS,

wherein

Namely the PCI, the device is,

and

corresponding to the SSS and PSS respectively,

thereby can be increased by simultaneously

And

or one parameter value range to achieve the purpose of increasing the number of the PCIs.

Fig. 9 is a schematic structural diagram of a space division multiplexing processing apparatus according to a first embodiment of the present invention, where the apparatus of this embodiment may be deployed in an eNB, and the apparatus of this embodiment is applied to a multi-antenna system, and includes: a determining module 1301 and a first space division multiplexing module 1302, wherein the determining module 1301 is configured to determine an inter-cell joint precoding weight according to channel state information of a user terminal accessing each cell; a first space division multiplexing module 1302, configured to weight the cell-level pilot and the control channel of each cell by using the inter-cell joint precoding weight, so as to implement space division multiplexing of the inter-cell control channel.

In the foregoing embodiment, the space division multiplexing processing apparatus further includes a second space division multiplexing module, configured to weight the data channels of each cell by using the inter-cell joint precoding weight, so as to implement space division multiplexing of the data channels; or, the inter-cell joint precoding weight is adopted to weight the data channel and the user-level pilot frequency, so as to realize space division multiplexing of the data channel.

In the above embodiment, at most one user terminal is accessed in each cell, so as to form a network architecture as shown in fig. 3, and when space division multiplexing is performed between cells, not only the problem of limited control channel capacity but also the problem of user-level pilot overhead can be solved.

In the above embodiment, the number of the user terminals accessed in each cell is greater than one; the above-mentioned device still includes: the frequency division and time division processing module is used for carrying out frequency division or time division processing on the control channels of all the user terminals in the same cell; and carrying out frequency division or time division processing on the data channels of all the user terminals in the same cell.

In the above embodiment, the apparatus further includes a scrambling module, configured to perform user-level scrambling corresponding to each terminal device on the cell-level pilot sent to each user terminal before the first space division multiplexing module 1302 weights the cell-level pilot and the control channel of each cell by using the inter-cell joint precoding weight.

In the above embodiment, the first spatial multiplexing module 1302 includes: an antenna determining unit, configured to determine, according to the inter-cell joint precoding weight, a transmitting antenna corresponding to each cell; the weighting processing unit is used for weighting the cell-level pilot frequency and the control channel to be sent by adopting the inter-cell joint pre-coding weight value; and the sending unit is used for sending the weighted cell-level pilot frequency and the weighted control channel on the transmitting antenna corresponding to each cell.

In the above embodiment, each cell at least includes one frequency division cell, the frequency division cell includes at least two sub-cells, frequency bands of the at least two sub-cells are not overlapped with each other, and at most one user terminal is accessed in each sub-cell; correspondingly, the determining module 1301 is configured to determine inter-cell joint precoding between the sub-cell and the cell having the overlapping frequency band with the sub-cell according to channel state information of the user terminal that is accessed to the sub-cell and the cell having the overlapping frequency band with the sub-cell; the space division multiplexing module 1302 is configured to weight the cell-level pilot frequency and the control channel of the sub-cell and the cell-level pilot frequency and the control channel of the cell by using the inter-cell joint precoding weight.

In the above embodiment, the spatial multiplexing processing apparatus further includes: a frequency division cell division module; the frequency division cell division module is configured to divide at least one cell in each cell into at least two sub-cells according to a frequency band according to the number of user terminals in the access cell and/or the service state information of the user terminals before the determination module 1301 determines the inter-cell joint precoding weight according to the channel state information of the user terminals accessed to each cell, so as to form a frequency division cell.

In the above embodiment, each cell includes at least one time-division cell, the time-division cell includes at least two sub-cells, transmission timeslots of the at least two sub-cells are not overlapped, and at most one user terminal is accessed to each sub-cell; correspondingly, the determining module 1301 is configured to determine, in a transmission timeslot of a sub-cell, joint precoding between the sub-cell and a cell between the sub-cell and the cell according to channel state information of user terminals accessed to the sub-cell and the cell; the space division multiplexing module 1302 is configured to weight the cell-level pilot frequency and the control channel of the sub-cell and the cell-level pilot frequency and the control channel of the cell by using the inter-cell joint precoding weight.

In the above embodiment, the spatial multiplexing processing apparatus further includes: a time division cell division module; the time division cell division module is configured to divide at least one cell in each cell into at least two sub-cells according to an integer multiple of a time slot according to the number of user terminals in the access cell and/or the service state information of the user terminals before the determination module 1301 determines the inter-cell joint precoding weight according to the channel state information of the user terminals accessed to each cell, so as to form a time division cell.

In the above embodiment, the space division multiplexing module 1302 is further configured to, when the time division cell includes two sub-cells, perform space division multiplexing on an odd timeslot with the cell, and perform space division multiplexing on an even timeslot with the cell.

Fig. 10 is a schematic structural diagram of a first embodiment of an access device in the present invention, where the access device is applied to a multi-antenna system, and specifically, the access device 1400 includes a communication interface 1401, a memory 1403, and a processor 1402, where the communication interface 1401, the processor 1402, and the memory 1403 are connected to each other through a bus 1404; the bus 1404 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 10, but this is not intended to represent only one bus or type of bus.

The communication interface 1401 is used for communication with a transmitting end. A memory 1403 for storing the program. In particular, the program may include program code including computer operating instructions. The memory 1403 may include a Random Access Memory (RAM) and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

The processor 1402 executes the program stored in the memory 1403 to implement the method of the foregoing method embodiment of the present invention:

and weighting the cell-level pilot frequency and the control channel of each cell by adopting the inter-cell joint precoding weight so as to realize space division multiplexing of the control channel among the cells.

The Processor 1402 may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; but may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components.

In the above embodiments, the device may be an enhanced base station eNB in an LTE system, a WiFi wireless access point AP in a wireless fidelity system, or a base station BS in worldwide interoperability for microwave access WiMAX.

The space division multiplexing processing apparatus and the access device according to the embodiments of the present invention implement the same functions as the above-described method, and are not described in detail.

Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A spatial multiplexing processing method is applied to a multi-antenna system, and the method comprises the following steps:

2. The method of claim 1, further comprising:

weighting the data channels of the cells by adopting the inter-cell combined precoding weight to realize space division multiplexing of the data channels;

alternatively, the first and second electrodes may be,

3. Method according to claim 1 or 2, characterized in that at most one user terminal is accessed in each cell.

4. The method according to claim 1 or 2, wherein the number of the accessed user terminals in each cell is more than one;

the method further comprises the following steps:

carrying out frequency division or time division processing on control channels of all user terminals in the same cell;

5. The method according to claim 1 or 2, wherein before weighting the cell-level pilot and control channels of each cell by using the inter-cell joint precoding weights, the method further comprises:

6. The method according to claim 1 or 2, wherein the weighting the cell-level pilot and control channel of each cell by using the inter-cell joint precoding weight to realize space division multiplexing of the inter-cell control channel comprises:

7. The method according to claim 1 or 2, wherein each cell comprises at least one frequency division cell, the frequency division cell comprises at least two sub-cells, frequency bands of the at least two sub-cells do not overlap with each other, and at most one user terminal is accessed in each sub-cell;

8. The method of claim 7, wherein before determining the inter-cell joint precoding weights according to the channel state information of the user terminals accessing each cell, the method further comprises:

9. The method according to claim 1 or 2, wherein each cell comprises at least one time division cell, the time division cell comprises at least two sub-cells, transmission time slots of the at least two sub-cells do not overlap with each other, and at most one user terminal is accessed in each sub-cell;

10. The method according to claim 9, wherein before determining the inter-cell joint precoding weight according to the channel state information of the user terminal accessing each cell, the method further comprises:

11. The method of claim 10, wherein the time-division cell comprises two sub-cells, and wherein one sub-cell is space-division multiplexed with the cell in odd slots, and the other sub-cell is space-division multiplexed with the cell in even slots.

12. A spatial multiplexing processing apparatus, wherein the apparatus is applied to a multi-antenna system, and the apparatus comprises:

13. The apparatus of claim 12, further comprising:

the second space division multiplexing module is used for weighting the data channels of the cells by adopting the inter-cell joint precoding weight to realize space division multiplexing of the data channels; or, the inter-cell joint precoding weight is adopted to weight the data channel and the user-level pilot frequency, so as to realize space division multiplexing of the data channel.

14. The apparatus according to claim 12 or 13, wherein at most one user terminal is accessed in each cell.

15. The apparatus according to claim 12 or 13, wherein the number of the user terminals accessed in each cell is greater than one;

the device further comprises:

16. The apparatus of claim 12 or 13, further comprising:

and a scrambling module, configured to perform user-level scrambling corresponding to each terminal device on the cell-level pilot frequency sent to each user terminal before the first space division multiplexing module weights the cell-level pilot frequency and the control channel of each cell by using the inter-cell joint precoding weight.

17. The apparatus of claim 12 or 13, wherein the first spatial multiplexing module comprises:

18. The apparatus according to claim 12 or 13, wherein each cell comprises at least one frequency division cell, the frequency division cell comprises at least two sub-cells, frequency bands of the at least two sub-cells do not overlap with each other, and at most one user terminal is accessed in each sub-cell;

19. The apparatus of claim 18, further comprising: and the frequency division cell division module is used for dividing at least one cell in each cell into the at least two sub-cells according to the frequency band according to the number of the user terminals in the accessed cell and/or the service state information of the user terminals before the determination module determines the inter-cell combined precoding weight according to the channel state information of the user terminals accessed to each cell, so as to form the frequency division cell.

20. The apparatus according to claim 12 or 13, wherein each cell comprises at least one time-division cell, the time-division cell comprises at least two sub-cells, transmission timeslots of the at least two sub-cells do not overlap with each other, and at most one user terminal is accessed in each sub-cell;

21. The apparatus of claim 20, further comprising: and the time division cell division module is used for dividing at least one cell in each cell into the at least two sub-cells according to integral multiple of time slots according to the number of the user terminals in the accessed cell and/or the service state information of the user terminals before the determination module determines the inter-cell joint precoding weight according to the channel state information of the user terminals accessed to each cell, so as to form the time division cell.

22. The apparatus of claim 21, wherein the space division multiplexing module is further configured to, when two sub-cells are included in the time-division cell, perform space division multiplexing with the cell on odd slots and perform space division multiplexing with the cell on even slots.

23. An access device, applied in a multi-antenna system, comprising:

the memory is used for storing programs, and the processor is used for executing the programs stored in the memory; when the space division multiplexing processing apparatus is operated, the processor executes a program including:

24. The access device of claim 23, wherein the device is an enhanced base station eNB in an LTE system, a WiFi wireless access point AP in a wireless fidelity system, or a base station BS in WiMAX.