WO2017028060A1

WO2017028060A1 - Method, device and apparatus for accessing a multiple-antenna system

Info

Publication number: WO2017028060A1
Application number: PCT/CN2015/087097
Authority: WO
Inventors: 杨晓; 尚政
Original assignee: 华为技术有限公司
Priority date: 2015-08-14
Filing date: 2015-08-14
Publication date: 2017-02-23
Also published as: CN107852668A; CN107852668B

Abstract

The present invention provides a method, device and apparatus for accessing a multiple-antenna system, the method comprising: in a process of a user equipment (UE) accessing a cell, determining whether or not the UE can access an idle cell, wherein the idle cell is a cell not accessed by a user; if the UE cannot access the idle cell, then generating a new idle cell; sending to the UE an instruction message, such that the UE accesses the new idle cell according to the instruction message. When applying the above method in a multiple-antenna system, in a cell configuration formed by using the above method, a control channel can perform joint precoding between cells on the basis of a cell-level pilot, resolving the problem of control channel capacity limits and user-level pilot overheads.

Description

Method, device and device for accessing multi-antenna system

Technical field

The present invention relates to communication technologies, and in particular, to a method, device and device for accessing a multi-antenna system.

Background technique

Multiple antennas are also called array antennas. It consists of a number of vibrating elements arranged in a space according to a certain geometry. Each element can receive and transmit signals independently. Multi-antenna technology is mainly divided into two major categories: MIMO (Multi-Input & Multi-Output) technology and smart antenna technology. Today, industry insiders have reached a consensus 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. Many of its advantages, such as large system capacity, high spectrum utilization, and fast signal transmission rate, are better alternatives to the existing wireless communication systems.

In a multi-antenna system, a cell is divided based on an antenna position, and each cell covers a certain range, and a UE (User Equipment) located in a cell coverage area accesses a cell in which the UE is located. The UE may demodulate the control channel of the cell to obtain basic information of the data channel, for example, may obtain control information such as a modulation and coding mode and a resource allocation mode, and then demodulate the data channel according to the control information, so that the UE may be in the accessed cell. Communicate with the corresponding antenna.

Summary of the invention

Embodiments of the present invention provide a method, device, and device for accessing a multi-antenna system to form a cell structure capable of implementing space division multiplexing of a control channel.

In a first aspect, an embodiment of the present invention provides a method for accessing a multi-antenna system, where the inter-cell joint precoding is used to weight a cell-level pilot and a control channel;

The method includes:

In the process of the terminal device accessing the cell, determining whether the terminal device can access the idle cell that is already in the access system, where the idle cell is a cell that has no user access;

Generating new idle if the terminal device cannot access the idle cell already existing in the system Community

And sending an indication message to the terminal device, so that the terminal device accesses the new idle cell according to the indication message.

Optionally, the method further includes: accessing the terminal device to the idle cell where the system already exists, directly or through the non-idle cell, where the idle cell already existing in the system is according to each non-idle cell in the system. The channel state information of the accessed terminal device is generated, and the non-idle cell is a cell that has at least one user access.

Optionally, the generating a new idle cell includes:

Obtaining channel state information of the terminal device;

Determining inter-cell joint precoding according to the channel state information;

Cell attribute information is determined according to the inter-cell joint precoding.

Optionally, in the process of the terminal device accessing the cell, determining whether the terminal device can access the existing idle cell in the system includes:

Performing cell access interaction with the terminal device;

Determining whether the terminal device accesses an idle cell or a non-idle cell.

Optionally, the performing cell access interaction with the terminal device includes:

Establishing an interaction with the terminal device for performing radio resource control RRC connection;

Correspondingly, the determining whether the terminal device accesses an idle cell or a non-idle cell includes:

After receiving the RRC connection setup complete message sent by the terminal device, determining whether the terminal device accesses an idle cell or a non-idle cell.

Optionally, the sending, by the terminal device, an indication message, to enable the terminal device to access the new idle cell according to the indication message, includes:

Sending, to the terminal device, an RRC connection release message of the non-idle cell;

Performing cell reselection interaction with the terminal device to enable the terminal device to access the new idle cell.

Establishing an interaction with the terminal device to establish an interaction;

After receiving the Attach Complete message sent by the terminal device, determining whether the terminal device accesses an idle cell or a non-idle cell.

Sending, to the terminal device, an RRC connection reconfiguration message, where the RRC connection reconfiguration message includes cell identification information of the new idle cell;

And receiving an RRC connection reconfiguration response message sent by the terminal device, so that the terminal device accesses the new idle cell according to the cell identity information.

Receiving a random access request sent by the terminal device;

Determining whether the terminal device can access an idle cell that already exists in the system.

Sending a random access response to the terminal device, where the random access response includes cell identification information of the new idle cell, so that the terminal device accesses the new idle cell according to the cell identity information. .

In a second aspect, an embodiment of the present invention provides an apparatus for accessing a multi-antenna system, where the apparatus is deployed in a multi-antenna system, and uses cell-to-cell joint pre-coding to weight cell-level pilot and control channels;

The device includes:

a determining module, configured to determine, in a process in which the terminal device accesses the cell, whether the terminal device can access an existing idle cell in the access system, where the idle cell is a cell that has no user access;

a new cell generation module, configured to generate a new idle cell when the terminal device cannot access an existing idle cell in the system;

The first access module is configured to send an indication message to the terminal device, so that the terminal device accesses the new idle cell according to the indication message.

Optionally, the device further includes: a second access module, configured to access the terminal device directly or through a non-idle cell to an idle cell that is already in the system, where the idle cell that is already in the system is Channel state information of terminal devices that have been accessed by each non-idle cell in the system, The non-idle cell is a cell that has been accessed by at least one user.

Optionally, the new cell generation module includes:

An information acquiring unit, configured to acquire channel state information of the terminal device;

An encoding determining unit, configured to determine inter-cell joint precoding according to the channel state information;

a cell generating unit, configured to determine cell attribute information according to the inter-cell joint precoding.

Optionally, the determining module includes:

An interaction unit, configured to perform cell access interaction with the terminal device;

The first attribute determining unit is configured to determine whether the terminal device accesses an idle cell or a non-idle cell.

Optionally, the interaction unit is specifically configured to perform radio resource control RRC connection establishment interaction with the terminal device;

The first attribute determining unit is specifically configured to determine, after receiving the RRC connection setup complete message sent by the terminal device, whether the terminal device accesses an idle cell or a non-idle cell.

Optionally, the first access module is specifically configured to send an RRC connection release message of the non-idle cell to the terminal device, and perform cell reselection interaction with the terminal device, so that the The terminal device accesses the new idle cell.

Optionally, the interaction unit is specifically configured to perform an Attach connection establishment interaction with the terminal device.

The first attribute determining unit is configured to determine, after receiving the Attach Complete message sent by the terminal device, whether the terminal device accesses an idle cell or a non-idle cell.

Optionally, the first access module is configured to send an RRC connection reconfiguration message to the terminal device, where the RRC connection reconfiguration message includes cell identification information of the new idle cell, and And receiving an RRC connection reconfiguration response message sent by the terminal device, so that the terminal device accesses the new idle cell according to the cell identity information.

Optionally, the determining module is specifically configured to receive a random access request sent by the terminal device, and to determine whether the terminal device can access the idle cell.

Optionally, the first access module is configured to send a random access response to the terminal device, where the random access response includes cell identification information of the new idle cell, so that the terminal The device accesses the new idle cell according to the cell identity information.

In a third aspect, an embodiment of the present invention provides an access device, where the device is applied to multiple antenna systems. In the system, including:

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

The memory is used to store a program, the processor is configured to execute the program stored by the memory; when the space division multiplexing processing device is in operation, the processor runs a program, and the program includes:

Generating a new idle cell if the terminal device cannot access an idle cell already existing in the system;

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 global microwave interconnection access WiMAX.

The method, device and device for accessing a multi-antenna system according to an embodiment of the present invention can limit access to only one terminal device in each cell, and the control channel can perform joint precoding between cells based on cell-level pilots, and the original channel does not exist. The channel estimation problem of the system cell-level pilot, so the control channel and the data channel can simultaneously perform spatial division multiplexing by using the cell-level pilot to perform joint precoding between cells, which not only solves the problem that the control channel capacity is limited, but also solves the problem. User level pilot overhead issues.

DRAWINGS

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

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

3 is a schematic structural diagram of a multi-antenna system according to an embodiment of the present invention;

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

5 is a flowchart of Embodiment 1 of a method for accessing a multi-antenna system according to the present invention;

6 is a flowchart of Embodiment 2 of a method for accessing a multi-antenna system according to the present invention;

7 is a signaling flowchart of a specific implementation of the second embodiment of the method shown in FIG. 6;

8 is a flowchart of Embodiment 3 of a method for accessing a multi-antenna system according to the present invention;

9 is a signaling flowchart of a specific implementation of the third embodiment of the method shown in FIG. 8;

10 is a flowchart of Embodiment 4 of a method for accessing a multi-antenna system according to the present invention;

11 is a signaling flowchart of a specific implementation of Embodiment 4 of the method shown in FIG. 10;

12 is a schematic structural diagram of Embodiment 1 of an apparatus for accessing a multi-antenna system according to the present invention;

13 is a schematic structural diagram of Embodiment 2 of an apparatus for accessing a multi-antenna system according to the present invention;

FIG. 14 is a schematic structural diagram of Embodiment 1 of an access device according to the present invention.

detailed description

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

In order to achieve reasonable allocation of system resources and reasonable scheduling of user services, the cell division mode is adopted in the multi-antenna system to enable the UE to access the multi-antenna system.

In a multi-antenna system, a method of cell division is to divide a cell based on an antenna setting position, and each cell has a certain signal coverage range, and UEs located in the same cell coverage area access the same cell in which the UE is located. .

After accessing the cell to which the UE is located, the UE may demodulate the control channel of the cell in which it is located to obtain control information of the data channel, for example, obtaining control information such as a modulation and coding mode and a resource allocation mode, and then demodulating the data channel according to the control information. Thereby, communication with the corresponding antenna can be performed within the accessed cell.

FIG. 1 is 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 respectively located in the signal coverage range of cell 0 and cell 2, and user 0 and user 5 are respectively connected to cell 0 and cell 2. In communication, User 0 and User 5 receive control channels and data channels from the respective cells in which they are located.

In order to improve the system user capacity, the inter-cell joint precoding may be used in the multi-antenna system for space division multiplexing of the multi-user data channel, wherein the weights used for inter-cell joint pre-coding may be generated according to the user channel state information participating in the space division multiplexing. .

Specifically, FIG. 2 is a schematic diagram of data channel space division multiplexing in the network architecture shown in FIG. 1.

In FIG. 2, user 0 and user 5 are still taken as an example. User 0 and user 5 are respectively a user equipment in cell 0 and cell 2, and user 0 and user 5 respectively receive control letters from respective cells. The data channel is from cell 0 to cell 2, and space division multiplexing of the data channel is implemented.

Therefore, in the foregoing cell division, space division multiplexing of the data channel can be implemented by using the inter-cell joint precoding method, and the control channel still needs to perform natural space division multiplexing by means of spatial separation between cells.

The cell-level pilots of different cells are different, and the user-level pilots of different UEs are different. The demodulation of the control channel is generally based on the cell-level pilot. For example, the PDCCH (Physical Downlink Control Channel) in the LTE R8/9/10 is demodulated based on the CRS (Cell Reference Signal). Data channel demodulation can be based on cell-level pilots, such as PDSCH (Physical Downlink Shared Channel) in TM4 in LTE R8/9/10, or based on user-level pilots, such as LTE R8/9/ 10 PDSCH under TM7.

Since the capacity of each cell control channel is limited (for example, the PDCCH in LTE R8/9/10 can only use only 3 symbols at most), if the control channel also wants to perform joint precoding between cells, in order to demodulate the control channel It is necessary to perform the same joint precoding for the cell-level pilot. In this case, if multiple UEs in a cell participate in space division multiplexing, the UEs in the cell use the same cell-level pilot, so they cannot pass. The precoding weights are distinguished, and the channel estimation of the pilots has interference, which affects the accuracy of the channel estimation. Finally, the demodulation performance of the control channel is degraded or even demodulated, so the control channel cannot be co-pre-coded by inter-cell. Sub-multiplexing, that is, the control channel capacity cannot be increased by precoding weighting.

As mentioned before, the data channel can be demodulated based on user-level pilots. Since the user-level pilots of each UE are different, there is no problem of cell-level pilot channel estimation, and with the number of antennas. Increasingly, the number of UEs that can be multiplexed by joint precoding will continue to increase, but since the control channel cannot be similarly multiplexed, the capacity of the control channel limits the number of multiplexed UEs.

Since the data channel uses user-level pilots, there are both user-level pilots and cell-level pilots in the system, thus increasing the pilot overhead of this system.

In order to solve the problem that the control channel is difficult to implement space division multiplexing, a new cell division mode can be adopted in the multi-antenna system. Different from the above division manner, in this new division mode, the antennas are no longer fixedly grouped by cell, and the antenna used by each cell is determined by the joint precoding weight, wherein the joint precoding weight is based on the participation air separation. The multiplexed user channel state information is generated, and the cell moves with the movement of the UE. In addition, the number of UEs allowed to be accessed by the cell is further limited.

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

As can be seen from FIG. 3, when there is at most one UE in each cell, that is, only user 0, user 1 and user 2 in cell 0, cell 1 and cell 2, respectively, it is equivalent to narrowing down each cell. The coverage of the coverage is accurate at the user level. At this time, since there is only one UE in each cell, the cell-level pilot can perform full-band space division multiplexing by performing joint precoding between cells, and there is no original system cell level. The channel estimation problem of the pilot, so the control channel and the data channel can simultaneously perform spatial division multiplexing by using the cell-level pilot to perform joint precoding between cells, which not only solves the problem that the control channel capacity is limited, but also solves the user-level guide. The problem of frequency overhead.

In the embodiment of the present invention, a cell may be divided into two types of cells according to the number of UEs accessed in the cell, a cell without a UE is referred to as an idle cell, and a cell having one UE is referred to as a non-idle cell. FIG. 4 is a schematic diagram of cell type conversion in a multi-antenna system according to an embodiment of the present invention. As can be seen from FIG. 4, an idle cell can be used to access a new UE, and when a new UE is accessed in the idle cell, It becomes a non-idle cell; when a non-idle cell disconnects all UEs, the non-idle cell becomes an idle cell.

Based on the cell architecture description of the multi-antenna system, the embodiment of the present invention provides a method for supporting a UE to access a multi-antenna system. When the UE requests access to the multi-antenna system, it can determine whether the UE can access the UE. In the idle cell, if the current UE cannot access the idle cell, the system generates an idle cell and instructs the current UE to access the idle cell, thereby controlling the coverage and the cell of the cell during the UE access process. The number of UEs accessed in the system is satisfied, and the multi-antenna system is used to perform space division multiplexing on the control channel to solve the problem that the control channel capacity of the multi-antenna system is limited, and the user-level guide can also be solved. The problem of frequency overhead.

Specifically, embodiments of the present invention provide an implementation of a method of accessing a multi-antenna system as follows.

The embodiments of the present invention can be applied to a communication system such as a cellular system, a wifi, or a wimax. Correspondingly, the network elements involved in the embodiments of the present invention are a long-term evolved base station LTE eNB, a WiFi AP (WiFi Wireless Access Point, wireless access in wireless fidelity). Incoming point), WiMAX BS (base station of Worldwide Interoperability for Microwave Access). For the sake of convenience, the following embodiments are described by taking an LTE eNB as an example.

Embodiment 1

As shown in FIG. 5, the executor of the method in this embodiment may be an LTE eNB, and the method mainly includes:

Step S11: During the process of the UE accessing the cell, determine whether the UE can access the idle cell that already exists in the system.

To access the multi-antenna system, the UE must perform cell search, acquire cell system information, random access, RRC (Radio Resource Control) connection, and Attach connection.

The main purpose of the cell search includes: 1) synchronizing the frequency and symbol with the cell; 2) acquiring the system frame timing, that is, the starting position of the downlink frame; and 3) determining the PCI (Physical-layer Cell Identity) of the cell. Identification).

After the UE selects to synchronize with one cell through the cell search, it receives the system message broadcast by the cell, and initiates the process of accessing the cell by using the received system message.

In the process of the UE accessing the cell, the eNB may determine whether the UE can access the existing idle cell in the system, for example, the UE searches through the cell, and selects the accessed cell as an existing idle cell in the system. The UE and the cell both have access conditions. At this time, the eNB can determine that the UE can access the idle cell and can directly access the access. For example, after the UE searches through the cell, the selected cell is not idle. a cell, but there is an idle cell with a UE access condition in the current system. In this case, the eNB may allow the UE to access the idle cell currently existing in the system by means of cell reselection, handover, etc., in this case, Determining that the UE can access the idle cell. Preferably, the idle cell that is already in the system is generated according to channel state information of the terminal device that is accessed by each non-idle cell in the system, and the non-idle cell is at least A cell accessed by a user.

When the UE selects to access a non-idle cell, and the current system does not have an idle cell with an access condition, the eNB determines that the UE cannot access the idle cell.

Step S12: If the UE cannot access the idle cell already existing in the system, a new idle cell is generated.

When the eNB determines that the current UE cannot access the idle cell already existing in the system, a new idle cell is generated, and the current UE is accessed into the new idle cell by a subsequent indication step.

The method for generating a new idle cell in the embodiment of the present invention may be generated by selecting different methods according to actual needs. In order to describe the process of the UE accessing the multi-antenna system, a method for generating a new idle cell is provided as an example in this embodiment. Specifically, the step of generating a new idle cell may include: acquiring a channel of the UE Status information; determining inter-cell association based on channel state information Combining precoding; determining cell attribute information according to inter-cell joint precoding. The cell attribute information may be, for example, a physical cell identifier PCI, a frequency of a cell, or the like, and content related to the defined cell.

Step S13: Send an indication message to the UE, so that the UE accesses the new idle cell according to the indication message.

After the eNB generates a new idle cell, it sends an indication message to the UE, and the UE accesses the new idle cell according to the received indication message.

With the above method for accessing a multi-antenna system in this embodiment, only one UE in each cell is defined, and the control channel can perform joint precoding between cells based on cell-level pilots, and there is no channel estimation of the original system cell-level pilot. The problem is that the control channel and the data channel can simultaneously perform spatial division multiplexing by using the cell-level pilot to perform joint precoding between cells, which not only solves the problem that the control channel capacity is limited, but also solves the problem of user-level pilot overhead.

In the method for accessing the multi-antenna system in the embodiment of the present invention, in order to enable the UE to finally access the idle cell, the cell structure shown in FIG. 3 is formed. In the process of requesting access by the UE, the eNB first determines whether the UE can access the idle state. The cell may be determined by the eNB performing cell access interaction with the UE, such as performing RRC access interaction, Attach access interaction, and random access interaction. In the process of performing the access interaction between the eNB and the UE, the eNB can determine whether the UE accesses the idle cell, and can obtain the channel state information of the UE during the UE access process, thereby providing information support for generating a new idle cell. .

Hereinafter, a method for a UE to access a multi-antenna system from different access stages of a UE will be described by way of a specific embodiment.

Embodiment 2

In order to access the UE that requests the access to the idle cell, the eNB determines whether the UE accesses the idle cell or the non-idle cell during the RRC connection process of the UE, and the eNB acquires the UE in the UE access process. Channel state information; when the eNB determines that the UE accesses the non-idle cell, after the RRC connection of the UE is completed, generates a new idle cell according to the acquired UE channel state information, and indicates the UE currently accessing the non-idle cell. Connect to the new idle cell through the reselection process.

As shown in FIG. 6, the executor of the method for the UE to access the multi-antenna system in this embodiment may be an LTE eNB, and the main processing steps include:

Step S21: Perform an RRC connection establishment interaction with the UE.

Step S22: After receiving the RRC connection setup complete message sent by the UE, determining that the UE is connected Whether it is an idle cell or a non-idle cell.

Step S23: After determining that the UE accesses the non-idle cell, generate a new idle cell.

It should be noted in this step that after the UE completes the RRC connection with the non-idle cell, the eNB determines that the UE has accessed the non-idle cell, and at this time, the non-idle cell includes at least two UEs.

In this embodiment, the eNB acquires channel state information of the UE in the process of establishing an RRC connection with the non-idle cell, and may generate a new idle cell according to the channel state information of the UE. Preferably, the antenna used by the new idle cell is used. The beam is aligned with the current UE.

Step S24: Send an RRC Connection Release message of the non-idle cell to the UE.

After the eNB determines that the UE establishes a connection with the non-idle cell through the RRC connection, the eNB sends a connection release message to the UE to indicate that the UE disconnects the RRC connection with the current non-idle cell, and if there are only two UEs in the non-idle cell accessed by the UE, After the UE disconnects from the non-idle cell, the non-idle cell becomes a cell that accesses only one UE.

Step S25: Perform cell reselection interaction with the UE, so that the UE accesses the new idle cell.

After the UE releases the connection with the non-idle cell, the cell is re-searched. Since the newly generated idle cell is a new cell generated according to the channel state information of the UE and used for pairing with the current UE, in the cell searched by the UE, according to the UE. The new idle cell generated by the UE channel state information is most consistent with the access condition of the UE, and the UE accesses the new idle cell through the cell reselection access procedure.

FIG. 7 is a signaling flowchart of a UE performing an RRC connection interaction with an eNB, generating a new idle cell, and accessing a UE to a new idle cell, including:

S201: The UE sends an RRC connection request to the eNB, where the RRC connection request may carry information such as an initial identifier of the UE and a reason for establishing the UE.

S202: After receiving the RRC connection request sent by the UE, the eNB sends an RRC Connection Setup message to the UE, where the RRC connection setup message may include establishing complete configuration information that the UE is connected to the requested non-idle cell RRC.

S203: After completing the RRC connection with the non-idle cell, the UE sends an RRC Connection Setup Complete message (RRC Connection Setup Complete) to the eNB.

S204: After receiving the RRC connection setup complete message, the eNB confirms that the UE completes the RRC connection with the non-idle cell, thereby generating a new idle cell according to the UE channel state information obtained during the exchange with the UE.

S205: After the eNB generates a new idle cell, the eNB sends a release and non-idle cell RRC connection to the UE. Message (RRC Connection Release).

S206-S208: After receiving the message of releasing the RRC connection, the UE searches for the cell again. Since the newly generated cell is generated according to the channel state information of the UE, the UE generally satisfies the access condition of the UE, so the UE accesses the new cell through the cell search. In the generated cell, the RRC connection with the new idle cell is started, and the RRC connection process between the UE and the new idle cell is the same as the steps S201 to S203, and details are not described herein.

Embodiment 3

In order to access the UE that requests the access to the idle cell, the eNB determines whether the UE accesses the idle cell or the non-idle cell during the Attach connection process of the UE, and the eNB acquires the UE during the UE access process. Channel state information; when the eNB determines that the UE accesses the non-idle cell, after the Attach connection of the UE is completed, generates a new idle cell according to the acquired UE channel state information, and indicates the UE currently accessing the non-idle cell. Switch to the new idle cell through the handover procedure.

As shown in FIG. 8, the executor of the method for accessing the multi-antenna system of the UE in this embodiment may be an LTE eNB, and the main processing steps include:

Step S31: Perform an Attach connection with the UE to establish an interaction.

Step S32: After receiving the Attach Complete message sent by the UE, determining whether the UE accesses the idle cell or the non-idle cell;

It should be noted in this step that after the UE completes the Attach connection with the non-idle cell, the eNB determines that the UE has accessed the non-idle cell, and at this time, the non-idle cell includes at least two UEs.

Step S33: After determining that the UE accesses the non-idle cell, generate a new idle cell.

In the embodiment of the present invention, the eNB acquires channel state information of the UE in the process of establishing an Attach connection with the non-idle cell, and may generate a new idle cell according to the channel state information of the UE. Preferably, the new idle cell is used. The beam of the antenna is aligned with the current UE.

Step S34: Send an RRC connection reconfiguration message to the UE, where the RRC connection reconfiguration message includes the identification information of the new idle cell.

Considering that the UE has established an Attach connection with the multi-antenna system to obtain the default bearer of the system, in order to enable the UE to switch from the currently accessed non-idle cell to the new idle cell, the eNB sends an RRC connection reconfiguration message to the UE, thereby The UE is handed over to the new idle cell by RRC reconfiguration.

The RRC reconfiguration message sent by the eNB to the UE includes the identification information of the new idle cell. Interest, such as PCI.

After receiving the RRC reconfiguration message, the UE re-establishes the RRC connection with the idle cell according to the identifier information of the idle cell in the message, and sends an RRC connection reconfiguration response message to the eNB.

Step S35: Receive an RRC connection reconfiguration response message sent by the UE to access the UE to the new idle cell.

After receiving the RRC connection reconfiguration response message sent by the UE, the eNB confirms that the UE has established an RRC connection with the new idle cell, and determines that the UE accesses the new idle cell.

As shown in FIG. 9, a signaling flowchart of a UE performing an Attach connection interaction with an eNB, generating a new idle cell, and accessing the UE to a new idle cell, includes:

S301: After completing the RRC connection with the non-idle cell, the UE sends an RRC connection complete message to the eNB, where the message carries an Attach connection request.

S302: The eNB sends a message to the UE to establish an RRC connection.

S303: After establishing an RRC connection with the non-idle cell, the UE sends an RRC connection complete message to the eNB.

S304: The eNB sends an RR connection reconfiguration message to the UE, where the message carries the Attach default bearer information.

S305: The UE sends an RRC connection reconfiguration message to the eNB.

S306: The UE sends an Attach Connection Complete message to the eNB.

S307: After receiving the Attach connection complete message, the eNB generates a new idle cell according to the UE channel state information acquired during the Attach connection.

S308: The eNB sends an RRC connection reconfiguration message to the UE.

S309: The UE switches to the new idle cell in response to the RRC connection reconfiguration message.

Embodiment 4

In the multi-antenna system access method of the second embodiment and the third embodiment, the eNB performs connection and interaction between the UE and the non-idle cell in order to acquire the channel state information of the UE. The eNB acquires the channel state information of the UE in the process of the connection between the UE and the non-idle cell. However, since the access process of the UE and the non-idle cell needs to occupy a long time, the time taken to acquire the channel state information of the UE is longer. Eventually, the time for the UE to finally access the new idle cell will be relatively long. In order to shorten the time for the UE to access the new idle cell, the UE determines whether the UE accesses the idle cell in the random access phase of the UE, and acquires the channel state information of the UE in the random access process of the UE. The new free cell provides information support.

As shown in FIG. 10, the executor of the method for accessing the multi-antenna system of the present implementation may be an LTE eNB, and the main processing steps include:

Step S41: Receive a random access request sent by the UE.

Step S42: Determine whether there is an idle cell that the UE can access in the system.

Step S43: When there is no idle cell in the system that the UE can randomly access, a new idle cell is generated.

Step S44: Send a random access response to the UE, where the random access response includes the identifier information of the new idle cell, so that the UE accesses the new idle cell according to the identifier information.

In the multi-antenna access method of the embodiment, the eNB acquires the user channel state information of the UE in the random access process of the UE, and avoids the process of the RRC connection and the Attach connection between the UE and the non-idle cell, thereby shortening the acquisition of the channel state of the UE. The time of the information finally simplifies the process of the UE accessing the new idle cell, and shortens the time for the UE to access the idle cell.

As shown in FIG. 11 , a signaling flowchart of a UE performing a random access interaction, generating a new idle cell, and accessing a UE to a new idle cell includes:

S401: The UE sends a random access preamble (Random Access Preamble) message to the eNB.

The eNB may select some or all of the 64 Preamble codes for contention access; and the random access preamble sequence message is carried in a PRACH (Physical Random Access Channel).

S402: After receiving the random access preamble sequence message, the eNB acquires channel state information of the UE according to the PRACH of the UE, and generates a new idle cell according to the obtained channel state information of the UE.

S403: The eNB sends a random access response message (Random Access Response) to the UE, where the sent random access response message includes the identifier information of the new idle cell, such as the PCI of the new idle cell.

S404: The UE re-searches according to the identifier information of the new cell in the received random access response message to access the new idle cell.

Currently, the bandwidth of the random access channel used by the UE in the random access process is 6 RBs, which cannot meet the requirement for obtaining full-bandwidth channel state information. Therefore, the bandwidth of the random access channel can be modified from 6 RBs to account for The number of RBs of the full system bandwidth, so that the eNB can acquire the channel state information of the full bandwidth when receiving the random access channel of the UE.

12 is a schematic structural diagram of Embodiment 1 of an apparatus for accessing a multi-antenna system according to the present invention. The apparatus is deployed in a multi-antenna system, and performs cell-level pilot and control channel weighting by using inter-cell joint precoding; the apparatus includes: determining The module 51, the new cell generation module 52, and the first access module 53. The determining module 51 is configured to determine, in the process of the terminal device accessing the cell, whether the terminal device can access the existing idle cell in the access system. The idle cell is a cell with no user access; the new cell generating module 52 is configured to generate a new idle cell when the terminal device cannot access the idle cell already existing in the system; the first access module 53 is configured to: Sending an indication message to the terminal device, so that the terminal device accesses the new idle cell according to the indication message.

In the foregoing embodiment, the device for accessing the multi-antenna system further includes: a second access module, configured to access the terminal device to the idle cell where the system already exists, directly or through the non-idle cell, where the system already exists The idle cell is generated according to channel state information of the terminal device that is accessed by each non-idle cell in the system, and the non-idle cell is a cell that has at least one user access.

13 is a schematic structural diagram of Embodiment 2 of an apparatus for accessing a multi-antenna system according to the present invention. The apparatus is deployed in a multi-antenna system, and uses cell-to-cell joint pre-coding to weight cell-level pilot and control channels. The apparatus includes: determining The functions of the module 51, the new cell generation module 52, and the first access module 53 are the same as those of the foregoing device embodiment 1, and are not described again.

In the above embodiment, the new cell generating module 52 includes: an information acquiring unit 521, an encoding determining unit 522, and a cell generating unit 523. The information acquiring unit 521 is configured to acquire channel state information of the terminal device, and the encoding determining unit 522 is configured to: The inter-cell joint precoding is determined according to the channel state information, and the cell generating unit 523 is configured to determine the cell attribute information according to the inter-cell joint precoding.

In the foregoing embodiment, the determining module 51 includes: an interaction unit 511, configured to perform cell access interaction with the terminal device, and a first attribute determining unit 512, configured to determine whether the terminal device accesses the idle cell or the non-idle cell.

In the foregoing embodiment, the interaction unit 511 is specifically configured to perform a radio resource control RRC connection establishment interaction with the terminal device. The first attribute determining unit 512 is specifically configured to: after receiving the RRC connection setup complete message sent by the terminal device, determine Whether the terminal device accesses an idle cell or a non-idle cell.

In the foregoing embodiment, the first access module 53 is specifically configured to send an RRC connection release message of the non-idle cell to the terminal device, and perform cell reselection interaction with the terminal device, so that the terminal device accesses the new idle cell. .

In the foregoing embodiment, the interaction unit 511 is specifically configured to perform an Attach connection establishment interaction with the terminal device. The first attribute determining unit 512 is specifically configured to determine, after receiving the Attach completion message sent by the terminal device, the terminal device accessing. Whether it is an idle cell or a non-idle cell.

In the foregoing embodiment, the first access module 53 is specifically configured to send an RRC connection reconfiguration message to the terminal device, where the RRC connection reconfiguration message includes the cell identifier information of the new idle cell, and is used to receive the sending by the terminal device. The RRC connects the reconfiguration response message to enable the terminal device to access the new idle cell according to the cell identity information.

In the foregoing embodiment, the determining module 51 is specifically configured to receive a random access request sent by the terminal device, and to determine whether the terminal device can access the idle cell.

In the above embodiment, the first access module 53 is specifically configured to send a random access response to the terminal device, where the random access response includes the cell identity information of the new idle cell, so that the terminal device accesses according to the cell identity information. New free cell.

FIG. 14 is a schematic structural diagram of Embodiment 1 of an access device according to the present invention. The device is applied to a multi-antenna system, including: the access device 1400 includes a communication interface 1401, a memory 1403, and a processor 1402, wherein the communication interface 1401 processes The device 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 or an extended industry standard architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 14, but it does not mean that there is only one bus or one type of bus.

The communication interface 1401 is for communicating with the transmitting end. The memory 1403 is configured to store a program. In particular, the program can include program code, the program code including computer operating instructions. The memory 1403 may include a random access memory (RAM), and may also include a non-volatile memory such as at least one disk storage.

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

The processor 1402 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP Processor, etc.), or a digital signal processor (DSP), an application specific integrated circuit. (ASIC), Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component.

In the above embodiment, the device is an enhanced base station eNB in the LTE system, a WiFi wireless access point AP in the wireless fidelity system, or a base station BS in the global microwave interconnection access WiMAX.

The functions of the device for accessing the multi-antenna system and the access device of the embodiment of the present invention are the same as those of the foregoing method, and are not repeatedly described.

A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to the program instructions. The foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. The foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.

Claims

A method for accessing a multi-antenna system, wherein in the multi-antenna system, cell-level pilot and control channel are weighted by using inter-cell joint precoding;

The method includes:

In the process of the terminal device accessing the cell, determining whether the terminal device can access the idle cell that is already in the access system, where the idle cell is a cell that has no user access;

Generating a new idle cell if the terminal device cannot access an idle cell already existing in the system;

And sending an indication message to the terminal device, so that the terminal device accesses the new idle cell according to the indication message.
The method according to claim 1, wherein the method further comprises: accessing the terminal device directly or through a non-idle cell to an idle cell in which the system already exists, wherein the idle cell already existing in the system A cell that is generated according to channel state information of a terminal device that is accessed by each non-idle cell in the system, where the non-idle cell is a cell that has at least one user access.
The method according to claim 1, wherein the generating a new idle cell comprises:

Obtaining channel state information of the terminal device;

Determining inter-cell joint precoding according to the channel state information;

Cell attribute information is determined according to the inter-cell joint precoding.
The method according to claim 1, wherein in the process of the terminal device accessing the cell, determining whether the terminal device can access the existing idle cell in the system includes:

Performing cell access interaction with the terminal device;

Determining whether the terminal device accesses an idle cell or a non-idle cell.
The method according to claim 4, wherein the performing cell access interaction with the terminal device comprises:

Establishing an interaction with the terminal device for performing radio resource control RRC connection;

Correspondingly, the determining whether the terminal device accesses an idle cell or a non-idle cell includes:

After receiving the RRC connection setup complete message sent by the terminal device, determining whether the terminal device accesses an idle cell or a non-idle cell.
The method according to claim 5, wherein the sending the indication message to the terminal device to enable the terminal device to access the new idle cell according to the indication message comprises:

Sending, to the terminal device, an RRC connection release message of the non-idle cell;

Performing cell reselection interaction with the terminal device to enable the terminal device to access the new idle cell.
The method according to claim 4, wherein the performing cell access interaction with the terminal device comprises:

Establishing an interaction with the terminal device to establish an interaction;

Correspondingly, the determining whether the terminal device accesses an idle cell or a non-idle cell includes:

After receiving the Attach Complete message sent by the terminal device, determining whether the terminal device accesses an idle cell or a non-idle cell.
The method according to claim 7, wherein the sending the indication message to the terminal device to enable the terminal device to access the new idle cell according to the indication message comprises:

Sending, to the terminal device, an RRC connection reconfiguration message, where the RRC connection reconfiguration message includes cell identification information of the new idle cell;

And receiving an RRC connection reconfiguration response message sent by the terminal device, so that the terminal device accesses the new idle cell according to the cell identity information.
The method according to claim 1, wherein in the process of the terminal device accessing the cell, determining whether the terminal device can access an existing idle cell in the system includes:

Receiving a random access request sent by the terminal device;

Determining whether the terminal device can access an idle cell that already exists in the system.
The method according to claim 9, wherein the sending the indication message to the terminal device to enable the terminal device to access the new idle cell according to the indication message comprises:

Sending a random access response to the terminal device, where the random access response includes cell identification information of the new idle cell, so that the terminal device accesses the device according to the cell identity information. Said a new idle cell.
An apparatus for accessing a multi-antenna system, wherein the apparatus is deployed in a multi-antenna system, and the cell-level pilot and control channel are weighted by using inter-cell joint precoding;

The device includes:

a determining module, configured to determine, in a process in which the terminal device accesses the cell, whether the terminal device can access an existing idle cell in the access system, where the idle cell is a cell that has no user access;

a new cell generation module, configured to generate a new idle cell when the terminal device cannot access an existing idle cell in the system;

The first access module is configured to send an indication message to the terminal device, so that the terminal device accesses the new idle cell according to the indication message.
The device according to claim 11, wherein the device further comprises: a second access module, configured to access the terminal device directly or through a non-idle cell to an idle cell in which the system already exists, wherein, in the system The idle cell that is already in existence is generated according to channel state information of a terminal device that has been accessed by each non-idle cell in the system, and the non-idle cell is a cell that has been accessed by at least one user.
The device according to claim 11, wherein the new cell generation module comprises:

An information acquiring unit, configured to acquire channel state information of the terminal device;

An encoding determining unit, configured to determine inter-cell joint precoding according to the channel state information;

a cell generating unit, configured to determine cell attribute information according to the inter-cell joint precoding.
The apparatus according to claim 11, wherein the determining module comprises:

An interaction unit, configured to perform cell access interaction with the terminal device;

The first attribute determining unit is configured to determine whether the terminal device accesses an idle cell or a non-idle cell.
The apparatus according to claim 14, wherein the interaction unit is specifically configured to perform a radio resource control RRC connection establishment interaction with the terminal device;

The first attribute determining unit is specifically configured to determine, after receiving the RRC connection setup complete message sent by the terminal device, whether the terminal device accesses an idle cell or a non-idle cell.
The apparatus according to claim 15, wherein said first access module has And configured to send an RRC connection release message of the non-idle cell to the terminal device; and configured to perform cell reselection interaction with the terminal device, so that the terminal device accesses the new idle cell.
The device according to claim 14, wherein the interaction unit is specifically configured to perform an Attach connection establishment interaction with the terminal device;

The first attribute determining unit is configured to determine, after receiving the Attach Complete message sent by the terminal device, whether the terminal device accesses an idle cell or a non-idle cell.
The device according to claim 17, wherein the first access module is configured to send an RRC connection reconfiguration message to the terminal device, where the RRC connection reconfiguration message includes the new idle And the RRC connection reconfiguration response message sent by the terminal device, so that the terminal device accesses the new idle cell according to the cell identity information.
The apparatus according to claim 11, wherein the determining module is specifically configured to receive a random access request sent by the terminal device; and to determine whether the terminal device can access an idle cell.
The device according to claim 19, wherein the first access module is specifically configured to send a random access response to the terminal device, where the random access response includes the new idle cell The cell identifier information is used to enable the terminal device to access the new idle cell according to the cell identity information.
An access device, characterized in that the device is applied to a multi-antenna system, comprising:

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

The memory is used to store a program, the processor is configured to execute the program stored by the memory; when the space division multiplexing processing device is in operation, the processor runs a program, and the program includes:

In the process of the terminal device accessing the cell, determining whether the terminal device can access the idle cell that is already in the access system, where the idle cell is a cell that has no user access;

Generating a new idle cell if the terminal device cannot access an idle cell already existing in the system;

And sending an indication message to the terminal device, so that the terminal device accesses the new idle cell according to the indication message.
The access device according to claim 21, 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 in a global microwave interconnection access WiMAX. BS.