CN102318195B - Co-channel interference suppression method and device - Google Patents

Abstract

Provide a kind of co-frequency interference suppression method, comprising the steps: according to the result that co-frequency macro cell is measured, start spread spectrum function (101); Carry out spread spectrum processing to the signal sent by bomb, send the signal through spread spectrum process (102 ). A communication device is also provided. According to this method, a micro cell is deployed in a macro cell, and the frequency of the macro cell and the micro cell is the same. Spread spectrum processing is performed on the signal, which effectively eliminates the strong interference between the micro cell and the same frequency macro cell in the network.

Description

Same-channel interference suppression method and device

technical field

The present invention relates to the field of communication technology, in particular to a method and device for co-channel interference suppression.

Background technique

With the development of mobile communication technology, user needs are becoming more and more diversified, and system equipment is also diversifying in order to meet this demand. Home indoor coverage and enterprise-level internal coverage base stations and other private networks (Private Network) that have attracted much attention Micro-community came into being. Such micro cells may include Femto cells, Pico cells and other cells with smaller coverage compared to macro cells, such as HeNB (Home eNodeB, Home Evolved Base Station), Home Cell (Home Cell), Access Point (Access Point) Point) and private cells (PrivateCell), etc., as well as private networks of certain specific frequency layers. Such micro cells may include CSG (Closed Subscriber Group, restricted subscription group) cells and non-CSG cells.

Due to the shortage and high cost of spectrum resources during network deployment, operators may deploy micro cells and macro cells on the same frequency in order to make full use of spectrum resources. Due to the small coverage area of the micro cell, which is completely within the coverage area of the macro cell, the macro cell will cause great interference to the micro cell. The transmission power of the micro cell is small, and the interference to the terminal outside the coverage of the micro cell in the macro cell is small, but the interference to the terminal in the coverage area of the micro cell and residing in the macro cell is relatively large.

In the prior art, methods such as interference randomization, interference elimination, and interference coordination technology are used to eliminate interference between macro cells. For interference elimination between macro cells, frequency reuse is mainly performed at the edge of the cell. However, since the entire coverage area of the micro cell is located in the macro cell, it is impossible to eliminate the same-frequency interference between the micro cell and the macro cell by adopting the solution for inter-macro cell interference in the prior art.

Contents of the invention

Embodiments of the present invention provide a same-frequency interference suppression method and device to reduce interference between cells of the same frequency.

On the one hand, an embodiment of the present invention provides a method for suppressing same-frequency interference, including: starting a spread spectrum function according to a measurement result of measuring a same-frequency macro cell;

The signal to be sent is subjected to spread spectrum processing, and the signal subjected to spread spectrum processing is sent.

On the other hand, an embodiment of the present invention also provides a co-channel interference suppression method, including: receiving a signal sent by a micro cell base station, and performing a spread spectrum processing on the signal after the micro cell base station activates a spread spectrum function; The spread spectrum function is activated according to the measurement results of the same-frequency macro cell;

Despread processing is performed on the received signal.

On the other hand, the embodiment of the present invention also provides a communication device, including: a start unit, configured to start the spread spectrum function according to the measurement result of the same-frequency macro cell;

The processing unit is configured to perform spread spectrum processing on the signal to be transmitted, and transmit the spread spectrum processed signal.

On the other hand, the embodiment of the present invention also provides a communication device, including: a receiving unit, configured to receive a signal sent by a micro cell base station, and the signal is subjected to spread spectrum processing after the micro cell base station activates a spread spectrum function, The spread spectrum function is started according to the measurement result of the same-frequency macro cell;

The processing unit is configured to perform despreading processing on the signal received by the receiving unit.

According to the method provided by the embodiment of the present invention, the micro cell is deployed in the macro cell, and the macro cell and the micro cell have the same frequency. Frequency function, spread spectrum processing for the signal to be sent, effectively eliminating the strong interference between micro cells and macro cells of the same frequency in the network.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a schematic flow chart of a co-channel interference suppression method provided by an embodiment of the present invention;

FIG. 2 is a schematic flow chart of a co-channel interference suppression method provided by another embodiment of the present invention;

FIG. 3 is a schematic diagram of a co-channel interference suppression method provided by another embodiment of the present invention;

FIG. 4 is a schematic diagram of a co-channel interference suppression method provided by another embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a communication device provided by another embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a communication device provided by another embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Referring to Fig. 1, an embodiment of the present invention provides a method for co-channel interference suppression, including:

101: Start the spread spectrum function according to the measurement result of the same-frequency macro cell.

102: Perform spectrum spreading processing on a signal to be sent, and send the signal subjected to spectrum spreading processing.

Referring to Fig. 2, the embodiment of the present invention also provides a co-channel interference suppression method, including:

201: Receive a signal sent by a micro cell base station, the signal is spread spectrum processed after the micro cell base station activates a spread spectrum function; the spread spectrum function is activated according to a measurement result of a same-frequency macro cell.

When the UE enters the micro cell that is allowed to access, it receives the signal sent by the micro cell base station. In order to suppress the interference between the micro cell and the same frequency macro cell, the micro cell base station activates the spread spectrum function, and the signal to be sent is processed. Spread spectrum processing.

202: Perform despreading processing on the received signal.

According to the method provided by the embodiment of the present invention, the micro cell is deployed in the macro cell, and the macro cell and the micro cell have the same frequency. Frequency function, spread spectrum processing for the signal to be sent, effectively eliminating the strong interference between micro cells and macro cells of the same frequency in the network.

Referring to Fig. 3, another embodiment of the present invention provides a method for co-channel interference suppression, including:

301: The micro cell base station measures the wireless environment, and activates the spread spectrum function according to the measurement result.

The micro-cell base station measures the signal strength of the same-frequency macro-cell, and if the measured signal strength of the same-frequency macro-cell and the signal strength of the micro-cell meet a certain condition, the spread spectrum function in the micro-cell base station is activated. The micro cell base station itself can start the spread spectrum function according to the measurement result; or the network management node in the system can configure the micro cell base station, and the network management node starts the spread spectrum function in the micro cell base station.

According to the signal strength of the same-frequency macro cell and the signal strength of the micro cell meet certain conditions, starting the spread spectrum function in the micro cell base station can be realized by the following methods:

For example, set the signal _strength threshold value S _thresh , which can be configured by the micro cell base station or the network management node. The S _thresh can be the value when the signal strength of the same frequency macro cell is equal to the signal strength of the micro cell. When the obtained signal strength of the same-frequency macro cell is greater than S _thresh , it is determined that the signal strength of the same-frequency macro cell is higher than that of the micro cell, and the spread spectrum function in the micro cell base station is activated. Or, when the measured signal strength of the same-frequency macro cell is greater than S _thresh - _{S offset} , start the spread spectrum function in the micro cell base station. S _offset is an offset, which can be configured by the micro cell base station or the network management node.

In the embodiment of the present invention, the spread spectrum function is started according to the measurement results of the wireless environment. In addition to the signal strength of the cell, it is also possible to judge whether to start the spread spectrum function according to the signal quality, that is, the micro cell base station measures the frequency of the same frequency macro cell. Signal quality, if the measured signal quality of the same-frequency macro cell and the signal quality of the micro cell meet certain conditions, then start the spread spectrum function in the micro cell base station, the specific implementation method and judge whether to start the spread spectrum function according to the signal strength For example, if the signal quality of the same-frequency macro cell is higher than the signal quality threshold Q _thresh , or the signal quality of the same-frequency macro cell is higher than Q _thresh -Q _offset , in the micro cell base station The spread spectrum function is activated, the Q _thresh is a value when the signal quality of the same-frequency macro cell is equal to the signal quality of the micro cell, and the Q _offset is an offset.

302: Notify the UE that the micro cell base station has started the spread spectrum function.

After the micro cell base station activates the spread spectrum function, it sends information indicating that the spread spectrum function has been activated to the UE.

If the base station of the micro cell stores a list of UEs allowed to access the micro cell, the micro cell may directly notify the UEs allowed to access the information indicating that the spread spectrum function has been activated. The information indicating that the spread spectrum function is activated may further include a flag indicating which channel signals are specifically spread and which channel signals are not spread. That is, one flag can be used to indicate whether the signal of one channel or multiple channels has been spread, and multiple flags can be used to indicate whether the signal of multiple channels has been spread. For example, use one flag to indicate whether the physical broadcast channel has been spread, or use one flag to indicate whether the signals of the physical broadcast channel and the synchronization channel have been spread, or use two flags to indicate whether the physical broadcast channel and the synchronization channel have been spread. The signal of the channel has been spread spectrum and so on.

If there is no list of UEs allowed to access stored in the micro cell, other network nodes may notify the UE. For example, the information that the micro cell base station starts spreading can be notified to the UE through the following methods:

The network side sends information indicating that the spread spectrum function has been activated to the network that is allowed to access the network through the application layer protocol OMA (Open Mobile Alliance)/OTA (Over the air) DM (Device Management). A UE in a micro cell. Among them, the OMA/OTA automatic configuration is realized through the SMS as the carrier. The OMA/OTA specification is used to package the UE parameters in a specific format, and then form a specific SMS to send to the UE. If the user's UE supports the OMA/OTA specification, the UE will convert this special short message, that is, the configuration information, into UE parameters after confirmation. Therefore, the information for starting the spread spectrum function of the micro cell base station can be set according to the OMA/OTA specification and sent to the UE through a short message, and the UE converts the short message into a UE parameter according to the OMA/OTA format for storage.

Or, when the base station of the micro cell activates the spread spectrum function, it notifies the macro cell with the same coverage. When the UE enters the macro cell with the same coverage as the micro cell, the macro cell notifies the UE of the information indicating that the micro cell has activated the During the handover to the macro cell, or the location registration process after UE cell reselection to the macro cell, the core network MME (Management Entity, Mobility) sends a list of micro cells that the UE is allowed to access to the macro cell base station. The macro cell can issue messages such as RRC (Radio Resource Control, radio resource control) connection establishment and RRC connection reconfiguration through dedicated signaling.

In this embodiment, after the information indicating that the spread spectrum function has been activated is notified to the UE, a flag can be set in the micro cell base station or other nodes in the network, and the flag indicates that when the spread spectrum function is turned off and restarted , the UE that has already notified the information indicating that the spread spectrum function is activated will not be notified again.

303: After receiving the information indicating that the micro cell base station has started the spread spectrum function, the UE sets an identification bit.

After receiving the information indicating that the micro cell base station has started the spread spectrum function, the UE sets and saves the flag bit of the micro cell base station, that is, saves the location information of the micro cell base station, indicating that the UE knows that the signal sent by the micro cell base station has been spread. After the UE receives the signal sent by the base station of the micro cell, it will directly perform despreading processing.

304: The micro cell base station sends the signal that has undergone spread spectrum processing to the UE.

Since the base station of the micro cell starts the spread spectrum function, the signal to be sent is subjected to spread spectrum processing and then sent. The micro cell base station can spread the signal on the SCH (Synchronization Channel) and the signal on the PBCH (Physical Broadcast Channel) with a spreading code, and then divide the spread signal into time and frequency sent in two-dimensional time-frequency blocks. Alternatively, the micro cell base station may only perform spectrum spreading processing on the signal on the PBCH, and then divide the spread spectrum signal into two-dimensional time-frequency blocks of time and frequency for transmission. Alternatively, the micro cell base station can spread the signal on the PBCH and the signal on the PDSCH (Physical Downlink Shared Channel, Physical Downlink Shared Channel), and then divide the spread signal into two-dimensional time-frequency blocks of time and frequency to send. Alternatively, the micro cell base station may spread the signals on the PBCH, PDSCH and SCH, and then divide the spread signals into two-dimensional time-frequency blocks of time and frequency for transmission.

305: The UE despreads the received signal that has undergone spread spectrum processing.

For a micro cell base station that allows UE access and has enabled the spread spectrum function, the UE has set the flag bit of the micro cell base station, knowing that the signal sent by the micro cell base station has undergone spread spectrum processing, when the UE enters the micro cell base station When the area is covered, the received signal is directly despread.

If the spread spectrum-processed signal sent by the micro cell base station is the signal on the SCH and the signal on the PBCH, first, the UE receives the signal in the preset time-frequency block for sending the synchronization signal, and uses the corresponding spreading code to The received signal is despread to obtain the transmitted signal, and the PCI (Physical Cell Identity) of the micro cell base station is analyzed, and then, the UE receives the signal in the preset time-frequency block for sending the main broadcast information, And despread the received signal with the corresponding spread spectrum code, and read the main broadcast information. The UE can analyze the signals of the despread synchronization channel and the physical broadcast channel.

If the spread-spectrum-processed signal sent by the micro-cell base station is only the signal on the PBCH, the UE first synchronizes with the micro-cell base station, and does not use the despreading method to receive the signal during the synchronization process. When the UE and the micro-cell base station are synchronized , the UE receives a signal of a physical broadcast channel in a preset time-frequency block.

If the signal on the PBCH and the signal on the PDSCH sent by the micro cell base station are spread-spectrum processed signals, the UE can confirm the spread-spectrum channel according to the instruction, and then despread according to the corresponding parameters such as the spreading code and spreading factor .

If the signals on the PBCH, SCH and PDSCH sent by the micro cell base station are spread-spectrum-processed signals, the UE can confirm the spread-spectrum channel according to the instructions, and then despread according to the corresponding parameters such as the spreading code and spreading factor. First despread the SCH signal, and then despread the PBCH and PDSCH channel signals after synchronization.

In the method provided in this embodiment, when a large number of micro cells with the same frequency are deployed in a macro cell, it is determined whether to activate the spread spectrum function in the micro cell base station according to the wireless environment. When the micro cell base station activates the spread spectrum function, it will actively activate the The spread spectrum information informs the UEs allowed to access the micro cell, which provides a flexible signal transmission method for the micro cell base station, effectively eliminates the interference between the micro cell and the same frequency macro cell in the network, and at the same time maintains High spectral efficiency and high peak rate services are provided.

Referring to FIG. 4 , another embodiment of the present invention provides a co-channel interference suppression method. In this embodiment, the UE does not receive the information sent by the network side that the micro cell base station starts spreading. The method includes:

In step 401, the microcell base station measures the wireless environment, and activates the spread spectrum function according to the measurement result. Specifically, step 401 can be implemented with reference to step 301 in the method shown in FIG. 3 , and details are not repeated here.

In step 402, the micro cell base station sends the spread-spectrum-processed signal to the UE. Specifically, step 402 can be implemented with reference to step 304 in the method shown in FIG. 3 , which will not be repeated here.

403: The UE despreads the received signal that has undergone spread spectrum processing.

According to the location information of the allowed access to the micro cell saved by the UE, when entering the micro cell, it performs OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) demodulation on the received signal sent by the micro cell base station, and simultaneously starts timer. If the received signal has not been spread, the UE can detect the micro cell base station before the timer expires; if the received signal is spread by the micro cell base station, the UE cannot detect the micro cell base station through OFDM demodulation Micro cell base station. In this embodiment, since the signal received by the UE is spread by the micro cell base station, the UE cannot detect the micro cell base station through OFDM demodulation. base station, the UE starts despreading and performs despreading processing on the received signal.

According to the method provided in this embodiment, when a large number of micro cells with the same frequency are deployed in a macro cell, it is determined whether to activate the spread spectrum function in the micro cell base station according to the wireless environment. When the micro cell base station activates the spread spectrum function, the signal to be sent Spread spectrum processing provides a flexible signal transmission method for the micro cell base station. At the same time, by setting a timer, the UE starts despreading when the timer expires, and performs despreading processing on the received signal, effectively eliminating the Interference between micro cells and co-frequency macro cells in the network.

Referring to FIG. 5, another embodiment of the present invention provides a communication device 500, including:

The starting unit 510 is configured to start the spread spectrum function according to the measurement result of the same-frequency macro cell; the processing unit 520 is configured to perform spread spectrum processing on the signal to be transmitted, and send the spread spectrum processed signal.

The starting unit 510 measures the signal strength of the same-frequency macrocell, and if the measured signal strength of the same-frequency macrocell and the signal strength of the communication device 500 meet a certain condition, activates the spread spectrum function in the communication device 500 . Specifically, it may be: set a signal strength threshold value S _thresh , the S _thresh may be configured by the micro cell base station or the network management node, and the S _thresh may be a value when the signal strength of the same frequency macro cell is equal to the signal strength of the micro cell, When the measured signal strength of the same-frequency macro cell is greater than S _thresh , it is determined that the signal strength of the same-frequency macro cell is higher than that of the micro cell, and the spread spectrum function in the micro cell base station is activated. Or, when the measured signal strength of the same-frequency macro cell is greater than S _thresh - _{S offset} , start the spread spectrum function in the micro cell base station. S _offset is an offset, which can be configured by the micro cell base station or the network management node.

In the embodiment of the present invention, the spread spectrum function is activated according to the measurement results of the wireless environment. In addition to the signal strength of the cell, it is also possible to judge whether to activate the spread spectrum function according to the signal quality. The specific implementation method and whether to judge according to the signal strength The function of starting the spread spectrum is similar. For example, if the signal quality of the same-frequency macro cell is higher than the signal quality threshold value Q _thresh , or the signal quality of the same-frequency macro cell is higher than Q _thresh -Q _offset , in the micro cell The base station activates the spread spectrum function, the Q _thresh is a value when the signal quality of the same-frequency macro cell is equal to the signal quality of the micro cell, and the Q _offset is an offset.

After the activation unit 510 activates the spread spectrum function of the communication device 500, the processing unit 520 performs spread spectrum processing on the signal to be transmitted and then transmits it. The processing unit 520 can spread the signal on the SCH and the signal on the PBCH with a spreading code, and then divide the spread signal into two-dimensional video blocks of time and frequency for transmission; or, it can only transmit the signal on the PBCH Spread spectrum processing of the signal, and then divide the spread signal into two-dimensional time-frequency blocks of time and frequency for transmission; or, the micro cell base station can spread the signal on the PBCH and the signal on the PDSCH, and then Divide the spread-spectrum signal into two-dimensional time-frequency blocks of time and frequency for transmission. Alternatively, the micro cell base station may spread the signals on the PBCH, PDSCH and SCH, and then divide the spread signals into two-dimensional time-frequency blocks of time and frequency for transmission.

The communications apparatus 500 may further include a notification unit 530, configured to notify the user equipment of information indicating that the spread spectrum function is activated. After the activation unit 510 activates the spread spectrum function, the notification unit 530 sends information indicating that the spread spectrum function has been activated to the UE, and the information indicating that the spread spectrum function has been activated may further include indicating which channel signals are specifically spread spectrum, and which The signal of the channel has no sign of spreading. That is, one flag can be used to indicate whether the signal of one channel or multiple channels has been spread, and multiple flags can be used to indicate whether the signal of multiple channels has been spread. If the communication device 500 stores a list of UEs allowed to access the communication device, the notifying unit 503 may directly notify the UEs allowed to access the information identifying that the spread spectrum function has been activated. If the communication apparatus 500 does not save the list of UEs allowed to access, other network nodes may notify the UEs. For example, the information that the micro cell base station starts spreading can be notified to the UE through the following methods:

The network side sends the information indicating that the spread spectrum function is activated to the UE that is allowed to access the micro cell through the application layer protocol OMA/OTADM. Among them, the OMA/OTA automatic configuration is realized through the SMS as the carrier. The OMA/OTA specification is used to package the UE parameters in a specific format, and then form a specific SMS to send to the UE. If the user's UE supports the OMA/OTA specification, the UE will convert this special short message, that is, the configuration information, into UE parameters after confirmation. Therefore, the information for starting the spread spectrum function of the micro cell base station can be set according to the OMA/OTA specification and sent to the UE through a short message, and the UE converts the short message into a UE parameter according to the OMA/OTA format for storage.

Or, when the activation unit 510 activates the spread spectrum function, it notifies the macro cell with the same coverage. When the UE enters the macro cell with the same coverage as the micro cell, the macro cell notifies the UE of information indicating that the micro cell has activated the spread spectrum function. When the UE During the handover to the macro cell, or the location registration process after UE cell reselection to the macro cell, the MME of the core network sends a list of micro cells that the UE is allowed to access to the macro cell base station. The macro cell can issue messages such as RRC connection establishment and RRC connection reconfiguration through dedicated signaling.

Referring to FIG. 6, another embodiment of the present invention provides a communication device 600, including:

The receiving unit 610 is configured to receive a signal sent by a micro cell base station, the signal is subjected to spread spectrum processing after the micro cell base station activates a spread spectrum function, and the spread spectrum function is determined according to the measurement result of the same frequency macro cell start up;

The processing unit 620 performs despreading processing on the signal received by the receiving unit 610 .

The communication device 600 enters the coverage area of the micro cell base station, and the micro cell base station allows the communication device to access, and the micro cell base station activates the spread spectrum function to perform spread spectrum processing on the transmitted signal. The receiving unit 610 of the communication device 600 receives the spread spectrum-processed signal sent by the micro cell base station. The processing unit 620 despreads the signal received by the receiving unit 610 . If the spread-spectrum-processed signal sent by the microcell base station is a signal on the SCH and a signal on the PBCH, the communication device 600 receives the signal in the preset time-frequency block for sending the synchronization signal, and uses the corresponding spread-spectrum code to The received signal is despread to obtain the transmitted signal, and the PCI of the micro cell base station is analyzed, and then the signal is received in the preset time-frequency block for sending the main broadcast information, and the received signal is transmitted with the corresponding spreading code. Despread the signal and read the main broadcast information.

If the spread-spectrum-processed signal sent by the microcell base station is only the signal on the PBCH, the communication device 600 first synchronizes with the microcell base station, and does not use the despreading method to receive the signal during the synchronization process. After that, the signal of the physical broadcast channel is received in the preset time-frequency block.

If the signal on PBCH and the signal on PDSCH sent by the micro cell base station are spread-spectrum processed signals, the communication device 600 confirms the spread-spectrum channel, and then performs despreading according to parameters such as corresponding spreading code and spreading factor.

If the signals on the PBCH, SCH, and PDSCH sent by the microcell base station are signals that have undergone spread spectrum processing, the communication device 600 confirms the spread spectrum channel, and then performs despreading according to parameters such as the corresponding spreading code and spreading factor. Despread the SCH signal, and despread the PBCH and PDSCH channel signals after synchronization.

The receiving unit 610 is also configured to receive information indicating that the microcell base station has activated the spread spectrum function, and the information indicating that the spread spectrum function has been activated may further include indicating which channels have been spread spectrum specific, and which channel signals have not been spread. Flag for spreading. That is, one flag can be used to indicate whether the signal of one channel or multiple channels has been spread, and whether the signal of multiple channels has been spread can also be indicated by multiple flags for each channel; the communication device 600 may also include an identifier setting unit 630, configured to set an identifier according to the information received by the receiving unit 610, the identifier indicating that the micro cell base station has started the spread spectrum function. function, when the communication device 600 enters the range covered by the micro cell, it can directly perform despreading processing on the received signal sent by the micro cell.

The communication device 600 may also include a timer setting unit 640, configured to set a timer;

The processing unit 620 is configured to perform despreading processing on the signal if the micro cell base station is not detected after the timer expires. The communication device 600 performs OFDM demodulation on the received signal sent by the base station of the micro cell when entering the micro cell according to the location information of the micro cell saved by itself, and starts a timer at the same time. frequency, the communication device 600 can detect the micro cell base station before the timer expires; if the received signal is spread by the micro cell base station, the communication device 600 cannot detect the micro cell base station through OFDM demodulation. In this embodiment, since the signal received by the receiving unit 610 is spread by the microcell base station, the communication device 600 cannot detect the microcell base station through OFDM demodulation. When the micro cell base station is called, the processing unit 620 performs despreading, and performs despreading processing on the received signal.

According to the method provided in this embodiment, when a large number of micro cells with the same frequency are deployed in a macro cell, it is determined whether to activate the spread spectrum function in the micro cell base station according to the wireless environment. When the micro cell base station activates the spread spectrum function, the signal to be sent Spread spectrum processing is performed to provide a flexible signal transmission method for the micro cell base station.

Those skilled in the art can also realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed in the application documents can be realized by electronic hardware, computer software or a combination of the two. In order to clearly illustrate the hardware and Interchangeability of software. In the above description, the components and steps of each example have been generally described according to their functions. The steps of the methods or algorithms described in connection with the embodiments disclosed herein may be implemented by hardware, software modules executed by a processor, or a combination of both. Software modules may reside in random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of in the storage medium.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (16)

1. A co-channel interference suppression method is characterized by comprising the following steps:

starting a spread spectrum function according to a measurement result of measuring the same-frequency macro cell;

carrying out spread spectrum processing on a signal to be transmitted, and transmitting the signal subjected to the spread spectrum processing;

wherein, the starting of the spread spectrum function according to the measurement result of the measurement of the co-frequency macro cell specifically comprises:

if the signal intensity of the same-frequency macro cell is higher than a signal intensity threshold value S_threshOr the signal strength of the same-frequency macro cell is higher than S_thresh-S_offsetThen starting the spread spectrum function in the micro cell base station, S_threshThe S is a value when the signal intensity of the co-frequency macro cell and the signal intensity of the micro cell are equal to each other_offsetIs an offset; or,

if the signal quality of the same-frequency macro cell is higher than a signal quality threshold value Q_threshOr the signal quality of the same-frequency macro-cell is higher than Q_thresh-Q_offsetThen, starting a spread spectrum function in the micro cell base station, Q_threshThe Q is a value when the signal quality of the same-frequency macro cell and the signal quality of the micro cell are equal_offsetIs an offset.

2. The method of claim 1, wherein the performing spread spectrum processing on the signal to be transmitted comprises:

performing spread spectrum processing on a signal of a physical broadcast channel; or,

performing spread spectrum processing on a signal of a synchronous channel and a signal of a physical broadcast channel; or,

carrying out spread spectrum processing on a signal of a physical broadcast channel and a signal of a physical downlink shared channel; or,

and performing spread spectrum processing on the signal of the physical broadcast channel, the signal of the synchronous channel and the signal of the physical downlink shared channel.

3. The method according to claim 1 or 2, characterized in that the method further comprises: the user equipment is notified of information indicating that the spread spectrum function is activated.

4. The method of claim 3, wherein the information indicating that the spreading function is activated comprises a flag indicating whether to perform spreading processing on the signal of the channel, and the flag comprises: whether or not a signal of one channel or a plurality of channels is spread can be indicated by using a mark; alternatively, whether or not signals of a plurality of channels are spread may be individually indicated by a plurality of flags.

5. The method of claim 3, wherein notifying the user equipment of the information indicating that the spreading function is activated comprises:

a micro cell base station notifies the user equipment of information indicating that the micro cell base station starts a spread spectrum function; or,

notifying the user equipment of the information indicating that the spread spectrum function is started through an application layer protocol; or,

and notifying the information indicating that the spread spectrum function is started to a macro cell covered by the macro cell, and notifying the information indicating that the spread spectrum function is started to the user equipment by the macro cell.

6. The method according to claim 3, wherein after notifying the user equipment of the information indicating that the spreading function is started, setting a flag indicating that the user equipment which has notified the information indicating that the spreading function is started is not notified of the information indicating that the spreading function is started again after next restarting of spreading.

7. A co-channel interference suppression method is characterized by comprising the following steps:

receiving a signal sent by a micro cell base station, wherein the signal is subjected to spread spectrum processing after a spread spectrum function is started by the micro cell base station; the spread spectrum function is started according to the measurement result of measuring the same-frequency macro cell;

performing despreading processing on the received signal;

the spread spectrum function is started according to a measurement result of measuring the co-frequency macro cell, and specifically includes:

if the signal intensity of the same-frequency macro cell is higher than a signal intensity threshold value S_threshOr the signal strength of the same-frequency macro cell is higher than S_thresh-S_offsetWhen starting in the micro cell base stationSpread spectrum function, said S_threshThe S is a value when the signal intensity of the co-frequency macro cell and the signal intensity of the micro cell are equal to each other_offsetIs an offset; or,

if the signal quality of the same-frequency macro cell is higher than a signal quality threshold value Q_threshOr the signal quality of the same-frequency macro-cell is higher than Q_thresh-Q_offsetThen, starting a spread spectrum function in the micro cell base station, Q_threshThe Q is a value when the signal quality of the same-frequency macro cell and the signal quality of the micro cell are equal_offsetIs an offset.

8. The method of claim 7, wherein the spread-spectrum processed signal comprises: a signal of a synchronization channel and a signal of a physical broadcast channel;

or, the spread spectrum processed signal includes: a signal of a physical broadcast channel;

or, the spread spectrum processed signal includes: a signal of a physical broadcast channel and a signal of a physical downlink shared channel;

or, the spread spectrum processed signal includes: a signal of a physical broadcast channel, a signal of a synchronization channel, and a signal of a physical broadcast channel.

9. The method of claim 7 or 8, further comprising:

receiving information indicating that the microcell base station starts a spread spectrum function;

and setting an identifier according to the information, wherein the identifier indicates that the micro cell base station starts a spread spectrum function.

10. The method of claim 7 or 8, further comprising:

setting a timer;

the despreading the received signal comprises:

and if the micro cell base station is not detected after the timer is overtime, despreading the signal.

11. A communications apparatus, comprising:

the starting unit is used for starting a spread spectrum function according to a measurement result of measuring the same-frequency macro cell;

the processing unit is used for carrying out spread spectrum processing on a signal to be transmitted and transmitting the signal subjected to the spread spectrum processing;

the starting unit is specifically configured to:

if the signal intensity of the same-frequency macro cell is higher than a signal intensity threshold value S_threshOr the signal strength of the same-frequency macro cell is higher than S_thresh-S_offsetThen starting the spread spectrum function in the micro cell base station, S_threshThe S is a value when the signal intensity of the co-frequency macro cell and the signal intensity of the micro cell are equal to each other_offsetIs an offset; or,

if the signal quality of the same-frequency macro cell is higher than a signal quality threshold value Q_threshOr the signal quality of the same-frequency macro-cell is higher than Q_thrseh-Q_offsetThen, starting a spread spectrum function in the micro cell base station, Q_threshThe Q is a value when the signal quality of the same-frequency macro cell and the signal quality of the micro cell are equal_offsetIs an offset.

12. The communication apparatus according to claim 11, wherein the processing unit is configured to perform spread spectrum processing on a signal of a synchronization channel and a signal of a physical broadcast channel; or, performing spread spectrum processing on the signal of the physical broadcast channel; or, performing spread spectrum processing on signals of a physical broadcast channel and a physical downlink shared channel; or, performing spread spectrum processing on signals of the physical broadcast channel, the synchronization channel and the physical downlink shared channel.

13. The communication apparatus according to claim 11 or 12, further comprising:

and a notification unit for notifying the user equipment of information indicating that the spread spectrum function is activated.

14. A communication device, comprising:

a receiving unit, configured to receive a signal sent by a micro cell base station, where the signal is subjected to spread spectrum processing after a spread spectrum function is started by the micro cell base station, and the spread spectrum function is started according to a measurement result obtained by measuring an intra-frequency macro cell;

a processing unit which performs despreading processing on the signal received by the receiving unit;

the spread spectrum function is started according to a measurement result of measuring the co-frequency macro cell, and specifically includes:

if the signal intensity of the same-frequency macro cell is higher than a signal intensity threshold value S_threshOr the signal strength of the same-frequency macro cell is higher than S_thresh-S_offsetThen starting a spread spectrum function in the micro cell base station, S_threshThe S is a value when the signal intensity of the co-frequency macro cell and the signal intensity of the micro cell are equal to each other_offsetIs an offset; or,

if the signal quality of the same-frequency macro cell is higher than a signal quality threshold value Q_threshOr the signal quality of the same-frequency macro-cell is higher than Q_thresh-Q_offsetThen, starting a spread spectrum function in the micro cell base station, Q_threshThe Q is a value when the signal quality of the same-frequency macro cell and the signal quality of the micro cell are equal_offsetIs an offset.

15. The communication device according to claim 14, wherein the receiving unit is further configured to receive information indicating that the femtocell base station starts a spreading function;

the communication device also comprises an identifier setting unit used for setting an identifier according to the information, wherein the identifier indicates that the micro cell base station starts the spread spectrum function.

16. The communications device of claim 14, further comprising: a timer setting unit for setting a timer;

the processing unit is configured to perform despreading processing on the signal if the micro cell base station is not detected after the timer expires.

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