CN102318195B - Co-channel interference suppression method and device - Google Patents
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- 238000004891 communication Methods 0.000 claims abstract description 41
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Abstract
A co-channel interference suppression method is provided, which includes steps of: starting a spread spectrum function according to the result of the measurement of a co-channel macro cell (101); spreading the signals to be transmitted, and transmitting the signals which have been spread (102). Also a communication device is provided. According to the method, a micro cell is disposed in a macro cell, the macro cell being in the same frequency as the micro cell. When a terminal in the micro cell is interfered, according to the measurement state of the macro cell, a spread spectrum function is started, and the signals to be transmitted is spread, effectively eliminating the strong interference among the micro cell and the co-channel macro cell in a network.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for suppressing co-channel interference.
Background
User requirements are more and more diversified along with the development of mobile communication technology, system equipment is diversified in order to adapt to the requirements, and micro cells such as home indoor coverage, enterprise-level internal coverage base stations and other Private networks (Private networks) which are concerned with are generated. Such a micro Cell may include a Femto Cell, a Pico Cell, and other cells with a smaller coverage area relative to a macro Cell, such as a HeNB (Home eNodeB), a Home Cell (Home Cell), an Access Point (Access Point), a private Cell (PrivateCell), and other private networks with certain frequency layers. Such micro cells may include CSG (Closed Subscriber Group) cells and non-CSG cells.
Due to shortage and high cost of spectrum resources in network deployment, operators may deploy microcells and macrocells on the same frequency to fully utilize the spectrum resources. Because the coverage area of the microcell is small and is completely within the coverage area of the macrocell, the macrocell can cause great interference to the microcell. The micro cell has smaller transmitting power, and has smaller interference to the terminal outside the coverage of the micro cell in the macro cell, but has larger interference to the terminal in the coverage area of the micro cell and residing in the macro cell.
In the prior art, for interference between macro cells, methods such as interference randomization, interference cancellation, interference coordination technology, and the like are adopted to cancel the interference, and for interference cancellation between macro cells, frequency reuse is mainly performed at the edge of a cell. However, since the whole coverage area of the microcell is located in the macrocell, the co-channel interference between the microcell and the macrocell cannot be eliminated by using the interference solution between the macrocells in the prior art.
Disclosure of Invention
The embodiment of the invention provides a method and a device for inhibiting same frequency interference, which can reduce the interference between same frequency cells.
In one aspect, an embodiment of the present invention provides a co-channel interference suppression method, including: starting a spread spectrum function according to a measurement result of measuring the same-frequency macro cell;
and carrying out spread spectrum processing on a signal to be transmitted, and transmitting the signal subjected to the spread spectrum processing.
On the other hand, the embodiment of the invention also provides a co-channel interference suppression method, which comprises 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;
and carrying out despreading processing on the received signal.
On the other hand, an embodiment of the present invention further provides a communication apparatus, including: the starting unit is used for starting a spread spectrum function according to a measurement result of measuring the same-frequency macro cell;
and the processing unit is used for carrying out spread spectrum processing on the signal to be transmitted and transmitting the signal subjected to the spread spectrum processing.
On the other hand, an embodiment of the present invention further provides a communication apparatus, including: 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;
and a processing unit for performing despreading processing on the signal received by the receiving unit.
According to the method provided by the embodiment of the invention, the microcell is deployed in the macrocell, the macrocell and the microcell have the same frequency, and when the interference is generated on the terminal under the microcell, the spread spectrum function is started in the microcell base station according to the measurement condition of the macrocell, and the spread spectrum processing is carried out on the signal to be sent, so that the strong interference between the microcell and the co-frequency macrocell in the network is effectively eliminated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a co-channel interference suppression method according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a co-channel interference suppression method according to another embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a co-channel interference suppression method according to another embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a co-channel interference suppression method according to another embodiment of the present invention;
fig. 5 is a schematic structural diagram of a communication device according to another embodiment of the present invention;
fig. 6 is a schematic structural diagram of a communication device according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides a co-channel interference suppression method, including:
101: and starting a spread spectrum function according to the measurement result of the measurement of the same-frequency macro cell.
102: and carrying out spread spectrum processing on a signal to be transmitted, and transmitting the signal subjected to the spread spectrum processing.
Referring to fig. 2, an embodiment of the present invention further provides a co-channel interference suppression method, including:
201: 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 the measurement of the same-frequency macro cell.
When UE enters a micro cell allowing access, a signal sent by a micro cell base station is received, and in order to inhibit interference between the micro cell and an intra-frequency macro cell, a spread spectrum function is started in the micro cell base station, and spread spectrum processing is carried out on the signal to be sent.
202: and carrying out despreading processing on the received signal.
According to the method provided by the embodiment of the invention, the microcell is deployed in the macrocell, the macrocell and the microcell have the same frequency, and when the interference is generated on the terminal under the microcell, the spread spectrum function is started in the microcell base station according to the measurement condition of the macrocell, and the spread spectrum processing is carried out on the signal to be sent, so that the strong interference between the microcell and the co-frequency macrocell in the network is effectively eliminated.
Referring to fig. 3, another embodiment of the present invention provides an intra-channel interference suppression method, including:
301: the micro cell base station measures the wireless environment and starts the spread spectrum function according to the measurement result.
The microcell base station measures the signal intensity of the co-frequency macrocell, and starts the spread spectrum function in the microcell base station if the measured signal intensity of the co-frequency macrocell and the signal intensity of the microcell meet certain conditions. The spread spectrum function can be started by the micro cell base station 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.
Starting a spread spectrum function in a microcell base station according to the condition that the signal intensity of the co-frequency macrocell and the signal intensity of the microcell meet a certain condition can be realized by the following method:
for example, a signal strength threshold value S is setthreshThe S ofthreshCan be configured by a micro cell base station or a network management node, the SthreshThe signal strength of the co-frequency macro cell and the signal strength of the micro cell can be equal, and when the measured signal strength of the co-frequency macro cell is greater than SthreshAnd when the signal intensity of the co-frequency macro cell is higher than that of the micro cell, starting a spread spectrum function in the micro cell base station. Or when the measured signal intensity of the co-frequency macro cell is greater than Sthresh-SoffsetWhen starting up the spread spectrum function in the microcell base station, SoffsetIs an offset, and can be configured by a micro cell base station or a network management node.
In the embodiment of the invention, the spread spectrum function is started according to the measurement result of the measured wireless environment, whether the spread spectrum function is started can be judged according to the signal quality besides the signal strength of the cell, namely, the micro cell base station measures the signal quality of the co-frequency macro cell, if the measured signal quality of the co-frequency macro cell and the signal quality of the micro cell meet a certain condition, the spread spectrum function in the micro cell base station is started, the specific implementation method is realized, whether the spread spectrum function is started is judged according to the signal strength, for example, if the signal quality of the co-frequency macro cell is higher than a signal quality threshold value Q, whether the spread spectrum function is started is judged to be similar to the specific implementationthreshOr the signal quality of the same-frequency macro-cell is higher than Qthresh-QoffsetThen, starting a spread spectrum function in the micro cell base station, QthreshThe Q is a value when the signal quality of the same-frequency macro cell and the signal quality of the micro cell are equaloffsetIs an offset.
302: and informing the UE that the micro cell base station starts a spread spectrum function.
After the femtocell base station starts the spread spectrum function, the femtocell base station transmits information indicating that the spread spectrum function is started to the UE.
If the list of UEs allowed to access the micro cell is stored in the base station of the micro cell, the micro cell may directly notify the UEs allowed to access the micro cell of information indicating that the spread spectrum function is activated. The information indicating that the spreading function is enabled may further include an indication indicating which channels of signals are specifically spread and which channels of signals are not spread. That is, whether or not signals of one channel or a plurality of channels are spread may be indicated by using one flag, and whether or not signals of a plurality of channels are spread may be indicated by using a plurality of flags for each channel. For example, one flag is used to indicate whether the physical broadcast channel is spread, one flag is used to indicate whether the signals of the physical broadcast channel and the synchronization channel are spread, two flags are used to indicate whether the signals of the physical broadcast channel and the synchronization channel are spread, respectively, and the like.
If no list of UEs allowed to access is stored in the micro cell, the UE may be informed by other network nodes. For example, the UE may be notified of information that the femtocell base station starts spreading by the following method:
the network side sends the information indicating that the spread spectrum function is started to the UE allowed to access the micro cell through an application layer protocol OMA (Open Mobile Alliance)/OTA (Over the air technology) DM (Device Management). The OMA/OTA automatic configuration is realized by taking a short message as a carrier, and the OMA/OTA specification is used for packaging UE parameters according to a specific format, further forming a specific short message and sending the specific short message to the UE. If the user's UE supports the OMA/OTA specification, the UE will convert this special short message, i.e. configuration information, to UE parameters after confirmation. Therefore, the information of the micro cell base station starting the spread spectrum function can be set according to the OMA/OTA specification and then sent to the UE in a short message mode, and the UE converts the short message into the UE parameter storage according to the OMA/OTA format.
Or, when the femtocell base station starts the spread spectrum function, notifying the macrocell in the same coverage, when the UE enters the macrocell in the same coverage as the femtocell, the macrocell notifying the UE of the information that the femtocell starts the spread spectrum function, and when the UE is switched to the macrocell or the UE reselects to the macrocell and then performs a location registration process, a core network MME (management entity) issues a list of the microcells to which the UE is allowed to access to the macrocell base station. The macro cell may be issued through messages such as dedicated signaling RRC (Radio Resource Control) connection establishment, RRC connection reconfiguration, and the like.
In this embodiment, after notifying the UE of the information indicating that the spreading function is started, an identifier may be set in the femtocell base station or another node in the network, where the identifier indicates that the UE that has notified the information indicating that the spreading function is started will not be notified again when the spreading function is restarted after being turned off.
303: and the UE sets the identification bit after receiving the information indicating that the micro cell base station starts the spread spectrum function.
After receiving the information indicating that the femtocell base station starts the spreading function, the UE sets and stores the flag bit of the femtocell base station, that is, stores the location information of the femtocell base station, and indicates that the UE knows that the signal sent by the femtocell base station is subjected to spreading processing, and if the UE receives the signal sent by the femtocell base station later, the UE directly performs despreading processing.
304: and the micro cell base station sends the signals subjected to the spread spectrum processing to the UE.
Because the microcell base station starts the spread spectrum function, the signals to be transmitted are spread spectrum processed and then transmitted. The femtocell base station may spread a signal on SCH (Synchronization Channel) and a signal on PBCH (Physical Broadcast Channel) with spreading codes, and then divide the spread signals into two-dimensional time frequency blocks of time and frequency for transmission. Or, the femtocell base station may perform spreading processing only on the signal on the PBCH, and then divide the spread signal into two-dimensional time-frequency blocks of time and frequency for transmission. Alternatively, the femtocell base station may spread signals on the PBCH and signals on the PDSCH (Physical Downlink Shared Channel), and then divide the spread signals into two-dimensional time-frequency blocks of time and frequency for transmission. Or, the femtocell base station may spread signals on the PBCH, the PDSCH and the 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 spread signal.
For the microcell base station which allows the access of the UE and starts the spread spectrum function, the UE already sets the flag bit of the microcell base station, knows that the signal sent by the microcell base station is subjected to the spread spectrum processing, and directly performs the de-spread processing on the received signal when the UE enters the coverage of the microcell.
If the signals sent by the micro Cell base station and subjected to the spread spectrum processing are signals on the SCH and signals on the PBCH, the UE receives the signals in a preset time frequency block for sending synchronization signals, despreads the received signals with corresponding spread spectrum codes to obtain transmitted signals, analyzes the PCI (Physical Cell Identity) of the micro Cell base station, receives the signals in a preset time frequency block for sending main broadcast information, despreads the received signals with the corresponding spread spectrum codes, and reads the main broadcast information. The UE may parse the signals of the despread synchronization channel and the physical broadcast channel.
If the signal sent by the micro cell base station and subjected to the spread spectrum processing is only the signal on the PBCH, the UE is firstly synchronized with the micro cell base station, a despreading method is not adopted in the synchronization process to receive the signal, and after the UE is synchronized with the micro cell base station, the UE receives the signal of a physical broadcast channel in a preset time frequency block.
If the signals on the PBCH and the PDSCH transmitted by the femtocell base station are signals subjected to spreading processing, the UE may confirm the spread channel according to the indication, and then perform despreading according to parameters such as corresponding spreading codes and spreading factors.
If the signals on the PBCH, SCH and PDSCH transmitted by the femtocell base station are signals subjected to spreading processing, the UE may confirm the spread channel according to the indication, and then perform despreading according to parameters such as corresponding spreading codes and spreading factors, first perform despreading on the SCH signal, and then perform despreading on the signals on the PBCH and PDSCH channels after synchronization.
In the method provided by the embodiment, when a large number of co-frequency micro cells are deployed in a macro cell, whether a spread spectrum function in a micro cell base station is started is determined according to a wireless environment, and after the micro cell base station starts the spread spectrum function, starting spread spectrum information is actively reported to UE (user equipment) allowing to access the micro cell, so that a flexible signal transmission method is provided for the micro cell base station, the interference between the micro cell and the co-frequency macro cell in a network is effectively eliminated, meanwhile, high spectrum efficiency is maintained to the greatest extent, and a high peak rate service is provided.
Referring to fig. 4, another embodiment of the present invention provides a method for suppressing co-channel interference, where in this embodiment, a UE does not receive information of starting spreading by a femtocell base station sent by a network side, and the method includes:
in step 401, the femtocell base station measures the wireless environment and starts the spreading function according to the measurement result, specifically, step 401 may be implemented with reference to step 301 in the method shown in fig. 3, which is not described herein again.
In step 402, the femtocell base station sends the signal subjected to the spreading processing to the UE, specifically, step 402 may be implemented with reference to step 304 in the method shown in fig. 3, and is not described herein again.
403: the UE despreads the received spread signal.
The UE performs OFDM (orthogonal frequency Division Multiplexing) demodulation on a received signal transmitted by the femtocell base station when entering the femtocell according to the location information which is stored in the UE and allows access to the femtocell, and starts a timer at the same time. If the received signal is not spread, the UE can detect the micro cell base station when the timer is not overtime; if the received signal is spread by the microcell base station, the UE cannot detect the microcell base station through OFDM demodulation. In this embodiment, since the signal received by the UE is spread by the femtocell base station, the UE cannot detect the femtocell base station through OFDM demodulation, and after the timer expires, if the UE does not demodulate the femtocell base station, the UE starts despreading to perform despreading processing on the received signal.
According to the method provided by the embodiment, when a large number of co-frequency micro cells are deployed in a macro cell, whether a spread spectrum function in a micro cell base station is started is determined according to a wireless environment, after the spread spectrum function is started by the micro cell base station, spread spectrum processing is carried out on signals to be sent, a flexible signal transmitting method is provided for the micro cell base station, meanwhile, UE starts de-spreading after the timer is overtime through setting the timer, de-spreading is carried out on the received signals, and interference between the micro cells and the co-frequency macro cells in a network is effectively eliminated.
Referring to fig. 5, another embodiment of the present invention provides a communication apparatus 500 including:
a starting unit 510, configured to start a spread spectrum function according to a measurement result obtained by measuring a co-frequency macro cell; a processing unit 520, configured to perform spreading processing on a signal to be transmitted, and transmit the spread signal.
The starting unit 510 measures the signal strength of the co-frequency macro cell, and starts the spectrum spreading function in the communication apparatus 500 if the measured signal strength of the co-frequency macro cell and the measured signal strength of the communication apparatus 500 satisfy a certain condition. The method specifically comprises the following steps: setting a signal strength threshold SthreshThe S ofthreshCan be configured by a micro cell base station or a network management node, the SthreshThe signal strength of the co-frequency macro cell and the signal strength of the micro cell can be equal, and when the measured signal strength of the co-frequency macro cell is greater than SthreshAnd when the signal intensity of the co-frequency macro cell is higher than that of the micro cell, starting a spread spectrum function in the micro cell base station. Or when the measured signal intensity of the co-frequency macro cell is greater than Sthresh-SoffsetWhen starting up the spread spectrum function in the microcell base station, SoffsetIs an offset, and can be configured by a micro cell base station or a network management node.
In the embodiment of the present invention, the spread spectrum function is started according to the measurement result of measuring the wireless environment, and whether to start the spread spectrum function can be determined according to the signal quality in addition to the signal strength of the cell, and the specific implementation method is similar to the method for determining whether to start the spread spectrum function according to the signal strength, for example, the method for starting the spread spectrum function is similar to the method for determining whether to start the spread spectrum function according to the signal strengthIf the signal quality of the same-frequency macro cell is higher than the signal quality threshold value QthreshOr the signal quality of the same-frequency macro-cell is higher than Qthresh-QoffsetThen, starting a spread spectrum function in the micro cell base station, QthreshThe Q is a value when the signal quality of the same-frequency macro cell and the signal quality of the micro cell are equaloffsetIs an offset.
After the starting unit 510 starts the spreading function of the communication apparatus 500, the processing unit 520 performs spreading processing on a signal to be transmitted and then transmits the signal. Processing unit 520 may spread the signals on SCH and PBCH with spreading codes, and then divide the spread signals into time and frequency two-dimensional video blocks for transmission; or, the signal on the PBCH may be spread only, and then the spread signal is divided into two-dimensional time frequency blocks of time and frequency to be sent; or, the femtocell base station may spread signals on the PBCH and signals on the PDSCH, and then divide the spread signals into two-dimensional time-frequency blocks of time and frequency for transmission. Or, the femtocell base station may spread signals on the PBCH, the PDSCH and the SCH, and then divide the spread signals into two-dimensional time frequency blocks of time and frequency for transmission.
The communication apparatus 500 may further include a notifying unit 530 for notifying the user equipment of information indicating that the spreading function is activated. After the starting unit 510 starts the spreading function, the notifying unit 530 sends information indicating that the spreading function is started to the UE, where the information indicating that the spreading function is started may further include a flag indicating which channels are specifically spread and which channels are not spread. That is, whether or not signals of one channel or a plurality of channels are spread may be indicated by using one flag, and whether or not signals of a plurality of channels are spread may be indicated by using a plurality of flags for each channel. If a list of UEs allowed to access the communication apparatus is stored in the communication apparatus 500, the notification unit 503 may directly notify the UEs allowed to access the communication apparatus of information identifying that the spreading function is activated. The UE may be informed by other network nodes if no list of UEs allowed to access is maintained in the communications apparatus 500. For example, the UE may be notified of information that the femtocell base station starts spreading by the following method:
and the network side sends the information indicating that the spread spectrum function is started to the UE which is allowed to access the micro cell through an application layer protocol OMA/OTADM. The OMA/OTA automatic configuration is realized by taking a short message as a carrier, and the OMA/OTA specification is used for packaging UE parameters according to a specific format, further forming a specific short message and sending the specific short message to the UE. If the user's UE supports the OMA/OTA specification, the UE will convert this special short message, i.e. configuration information, to UE parameters after confirmation. Therefore, the information of the micro cell base station starting the spread spectrum function can be set according to the OMA/OTA specification and then sent to the UE in a short message mode, and the UE converts the short message into the UE parameter storage according to the OMA/OTA format.
Or, the starting unit 510 notifies the macro cell covered by the same cell when starting the spread spectrum function, and when the UE enters the macro cell covered by the same cell as the macro cell, the macro cell notifies the UE of the information indicating that the micro cell starts the spread spectrum function, and when the UE is handed over to the macro cell or the UE cell reselects to the macro cell and performs a location registration process, the core network MME issues a list of micro cells that allow the UE to access to the macro cell base station. The macro cell can be issued through messages such as dedicated signaling RRC connection establishment and RRC connection reconfiguration.
Referring to fig. 6, another embodiment of the present invention provides a communication apparatus 600 including:
a receiving unit 610, configured to receive a signal sent by a micro cell base station, where the signal is subjected to a spreading process after a spreading function is started by the micro cell base station, and the spreading function is started according to a measurement result obtained by measuring an intra-frequency macro cell;
The communication apparatus 600 enters the coverage area of the femtocell base station, and the femtocell base station allows the communication apparatus to access, and the femtocell base station activates the spreading function to perform spreading processing on the transmitted signal. Receiving section 610 of communication apparatus 600 receives a signal subjected to spread spectrum processing transmitted from the femtocell base station. Processing section 620 performs despreading processing on the signal received by receiving section 610. If the signals transmitted by the femtocell base station and subjected to the spreading processing are signals on the SCH and signals on the PBCH, the communication device 600 receives the signals in a preset time-frequency block for transmitting the synchronization signals, despreads the received signals with corresponding spreading codes to obtain transmitted signals, analyzes the PCI of the femtocell base station, receives the signals in a preset time-frequency block for transmitting the primary broadcast information, despreads the received signals with corresponding spreading codes, and reads the primary broadcast information.
If the signal sent by the femtocell base station and subjected to the spread spectrum processing is only the signal on the PBCH, the communication device 600 synchronizes with the femtocell base station first, receives the signal without adopting a despreading method in the synchronization process, and receives the signal of the physical broadcast channel in a preset time-frequency block after synchronizing with the femtocell base station.
If the PBCH signal and the PDSCH signal transmitted by the femtocell base station are signals subjected to spreading processing, the communication device 600 confirms the spread channel and then despreads the signals according to parameters such as corresponding spreading codes and spreading factors.
If the signals on PBCH, SCH, and PDSCH transmitted by the femtocell base station are signals subjected to spreading processing, the communication device 600 confirms the spread channel, then despreads according to parameters such as corresponding spreading codes and spreading factors, first despreads the SCH signal, and despreads the signals on PBCH and PDSCH channels after synchronization.
The receiving unit 610 is further configured to receive information indicating that the femtocell base station starts a spreading function, where the information indicating that the spreading function is started may further include a flag indicating which channels are specifically spread and which channels are not spread. That is, whether or not signals of one channel or a plurality of channels are spread may be indicated by using one flag, and whether or not signals of a plurality of channels are spread may be indicated by using a plurality of flags for each channel; the communication apparatus 600 may further include an identifier setting unit 630, configured to set an identifier according to the information received by the receiving unit 610, where the identifier indicates that the femtocell base station starts the spreading function, and since the identifier indicating that the femtocell base station starts the spreading function is set in the communication apparatus 600, when the communication apparatus 600 enters the coverage area of the femtocell, the communication apparatus may directly perform despreading processing on the received signal sent by the femtocell.
The communication apparatus 600 may further include a timer setting unit 640 for setting a timer;
the processing unit 620 is configured to perform despreading processing on the signal if the femtocell base station is not detected after the timer expires. According to the position information which is stored by the communication device 600 and allowed to access the micro cell, when the communication device enters the micro cell, the communication device 600 performs OFDM demodulation on the received signal sent by the micro cell base station, and simultaneously starts a timer, and if the received signal is not subjected to spread spectrum, the communication device 600 can detect the micro cell base station without the timer being overtime; if the received signal is spread by the femtocell base station, the communication apparatus 600 cannot detect the femtocell base station by OFDM demodulation. In this embodiment, since the signal received by receiving section 610 is spread by the femtocell base station, communication apparatus 600 cannot detect the femtocell base station by OFDM demodulation, and if the femtocell base station is not demodulated even after the timer has timed out, processing section 620 despreads the received signal and despreads the received signal.
According to the method provided by the embodiment, when a large number of co-frequency micro cells are deployed in a macro cell, whether a spread spectrum function in a micro cell base station is started is determined according to a wireless environment, and after the spread spectrum function is started, a signal to be sent is subjected to spread spectrum processing, so that a flexible signal transmitting method is provided for the micro cell base station.
Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate the interchangeability of hardware and software. The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied in hardware, a software module executed by a processor, or a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
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 SthreshOr the signal strength of the same-frequency macro cell is higher than Sthresh-SoffsetThen starting the spread spectrum function in the micro cell base station, SthreshThe 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 otheroffsetIs an offset; or,
if the signal quality of the same-frequency macro cell is higher than a signal quality threshold value QthreshOr the signal quality of the same-frequency macro-cell is higher than Qthresh-QoffsetThen, starting a spread spectrum function in the micro cell base station, QthreshThe Q is a value when the signal quality of the same-frequency macro cell and the signal quality of the micro cell are equaloffsetIs 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 SthreshOr the signal strength of the same-frequency macro cell is higher than Sthresh-SoffsetWhen starting in the micro cell base stationSpread spectrum function, said SthreshThe 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 otheroffsetIs an offset; or,
if the signal quality of the same-frequency macro cell is higher than a signal quality threshold value QthreshOr the signal quality of the same-frequency macro-cell is higher than Qthresh-QoffsetThen, starting a spread spectrum function in the micro cell base station, QthreshThe Q is a value when the signal quality of the same-frequency macro cell and the signal quality of the micro cell are equaloffsetIs 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 SthreshOr the signal strength of the same-frequency macro cell is higher than Sthresh-SoffsetThen starting the spread spectrum function in the micro cell base station, SthreshThe 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 otheroffsetIs an offset; or,
if the signal quality of the same-frequency macro cell is higher than a signal quality threshold value QthreshOr the signal quality of the same-frequency macro-cell is higher than Qthrseh-QoffsetThen, starting a spread spectrum function in the micro cell base station, QthreshThe Q is a value when the signal quality of the same-frequency macro cell and the signal quality of the micro cell are equaloffsetIs 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 SthreshOr the signal strength of the same-frequency macro cell is higher than Sthresh-SoffsetThen starting a spread spectrum function in the micro cell base station, SthreshThe 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 otheroffsetIs an offset; or,
if the signal quality of the same-frequency macro cell is higher than a signal quality threshold value QthreshOr the signal quality of the same-frequency macro-cell is higher than Qthresh-QoffsetThen, starting a spread spectrum function in the micro cell base station, QthreshThe Q is a value when the signal quality of the same-frequency macro cell and the signal quality of the micro cell are equaloffsetIs 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.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2009/071779 WO2010130091A1 (en) | 2009-05-13 | 2009-05-13 | Co-channel interference suppression method and device |
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| CN102318195B true CN102318195B (en) | 2014-04-02 |
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| US9439124B2 (en) | 2012-08-10 | 2016-09-06 | Huawei Technologies Co., Ltd. | Mobility control method and apparatus |
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| CN103117757B (en) * | 2013-01-21 | 2016-08-03 | 华为技术有限公司 | A kind of signal acceptance method and terminal |
| CN107167772A (en) * | 2017-05-09 | 2017-09-15 | 成都锦江电子系统工程有限公司 | A kind of phase code eliminates co-channel interference method and system |
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| TW376601B (en) * | 1995-08-01 | 1999-12-11 | Siemens Ag | Method and arrangement for reducing common channel interference in radio system with a cellular structure |
| CN1518253A (en) * | 2003-01-15 | 2004-08-04 | 华为技术有限公司 | Orthogonal frequency division multiplexing modem device and method |
| CN100534021C (en) * | 2004-12-08 | 2009-08-26 | 大唐移动通信设备有限公司 | Distribution method for channelizing code of CDMA system |
| CN1909413B (en) * | 2005-08-02 | 2011-04-06 | 上海原动力通信科技有限公司 | Method for transmitting variable-speed data in time slot CDMA cellular system |
| KR100873173B1 (en) * | 2007-02-06 | 2008-12-10 | 인하대학교 산학협력단 | System and Method for co-channel interference cancellation in cellular OFDM systems |
| CN101272603B (en) * | 2007-03-19 | 2013-04-17 | 华为技术有限公司 | Method and equipment for terminal measuring limited network community |
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| US9439124B2 (en) | 2012-08-10 | 2016-09-06 | Huawei Technologies Co., Ltd. | Mobility control method and apparatus |
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