WO2012000160A1 - Method and system for energy saving control for base station, and radio network controller - Google Patents

Abstract

The present invention discloses a method and system for energy saving control for a base station, and a Radio Network Controller (RNC), wherein, the method includes: after cell establishment, when the RNC determines to shut off Multiple Input Multiple Output (MIMO) transmission antennas of the cell to perform energy saving, the MIMO mode of the cell is closed by deactivating the transmit diversity of the cell; and/or, after the cell establishment, when the RNC determines to shut off transmit diversity antennas of the cell to perform energy saving, the transmit diversity of the cell is closed by deactivating the transmit diversity of the cell. By the present invention, the MIMO mode or the ordinary transmit diversity of the cell of the base station can be configured flexibly, high speed data requirements of users can be satisfied, and one transmission antenna can be shut off at the right time; thus the energy saving purpose is achieved.

Description

 Base station energy-saving control method, system and wireless network controller

TECHNICAL FIELD The present invention relates to a wireless communication system, and in particular, to a base station energy-saving control method and system, and a wireless network controller.

Background technique

 At present, the profits of the telecommunications industry are gradually decreasing. Telecom operators are increasing their market share and business types to increase revenues. At the same time, they are paying more and more attention to saving OPEX (Operating Expense). Equipment energy consumption is an important part of OPEX. .

UMTS (Universal Mobile Telecommunications System) can be divided into several main components: CN (Core Network) for establishing and controlling user sessions, and UTRAN (Universal Terrestrial Radio Access Network) for controlling air interfaces. Terrestrial Radio Access Network). As shown in FIG. 1, the UTRAN includes two network elements, an RNC (Radio Network Controller) 11 and a NodeB (base station) 12, wherein the base station 12 further includes a BBU (Baseband Processing Unit) 121 and an RU (Radio Frequency Processing Unit). 122. The main functions of the BBU121 are the baseband processing function (Using channel coding, multiplexing, modulation, and spreading, etc. for over-the-air transmission) and the Iub interface between the RNC 11 to complete the Uu interface between the UE (User Equipment) 13. Functions, signaling processing, local and remote operation and maintenance functions, and operation status monitoring and alarm information reporting of the base station system.

RU122 mainly includes the following modules: IF module: completes the modulation and demodulation of optical transmission, digital up-conversion, A/D (Analog/Digital) conversion;

Transceiver module: Complete the conversion function of IF signal to RF signal; Power amplifier module: Complete signal enhancement function; Filter module: Complete signal filtering function. SUMMARY OF THE INVENTION The technical problem to be solved by the present invention is to provide a method, a system, and a radio network controller for controlling energy saving of a base station, so as to achieve energy saving of the base station. In order to solve the above technical problem, the present invention provides a method for controlling energy saving of a base station, including: after a cell is established, a radio network controller (RNC) decides to turn off multiple input and multiple output of a cell.

When the (MIMO) transmit antenna performs power saving, the MIMO mode of the cell is turned off by deactivating the transmit diversity of the cell; and/or, after the cell is established, the RNC decides to turn off the transmit diversity antenna of the cell to save energy, and deactivates the transmit diversity of the cell. To turn off the transmit diversity of the cell. Preferably, in the step of deactivating the transmit diversity of the cell, the transmit diversity of the cell is activated by reconfiguring the cell. Preferably, the step of deactivating the MIMO mode of the cell by deactivating the transmit diversity of the cell comprises:

The RNC sends a cell reconfiguration message to the base station, and the cell reconfiguration message is used to indicate that the base station deactivates the transmit diversity of the cell; the base station receives the RCC to send a cell reconfiguration message, and activates the transmit diversity according to the RNC indication to the RNC. Returns the cell reconfiguration response. Preferably, after deactivating the transmit diversity of the cell to turn off the MIMO mode of the cell, the method further includes: when the RNC decides to enable the MIMO transmit antenna of the cell, by enabling the transmit diversity of the cell to enable the MIMO mode of the cell; After the transmit diversity of the cell is used to close the transmit diversity of the cell, the method further includes: when the RNC decides to enable the transmit diversity antenna of the cell, the cell transmit diversity is enabled by activating the transmit diversity of the cell. Preferably, in the step of activating the transmit diversity of the cell, the transmit diversity of the cell is activated by reconfiguring the cell. Preferably, the step of enabling the MIMO mode of the cell by activating the transmit diversity of the cell Includes:

The RNC sends a cell reconfiguration message to the base station, and the cell reconfiguration message is used to indicate that the base station activates the transmit diversity of the cell; the base station receives the RCC to send a cell reconfiguration message, activates the transmit diversity according to the indication of the RNC, and returns the cell to the RNC. Reassign the response. In order to solve the above technical problem, the present invention provides a base station energy-saving control system, including a radio network controller (RNC) and a base station, where: the RNC is configured to: after the cell is established, determine to close the multi-input and multi-output of the cell (MIMO) When the transmit antenna or the transmit diversity antenna of the cell performs power saving, the base station is instructed to deactivate the transmit diversity of the cell; the base station is configured to: deactivate the transmit diversity of the cell according to the indication of the RNC, to turn off the MIMO mode of the cell or disable the transmission of the cell. separation. Preferably, the RNC is configured to: instruct the base station to deactivate the transmit diversity of the cell by sending a cell reconfiguration message to the base station. Preferably, the RNC is further configured to: when deciding to turn on the MIMO transmit antenna of the cell or the transmit diversity antenna of the cell, instructing the base station to activate transmit diversity of the cell; the base station is further configured to: activate the transmit diversity of the cell according to the indication of the RNC, To turn on the MIMO mode of the cell or turn on the transmit diversity of the cell. Preferably, the RNC is configured to: instruct the base station to activate transmit diversity of the cell by sending a cell reconfiguration message to the base station. In order to solve the above technical problem, the present invention provides a radio network controller, including a decision module and a sending module, where: the decision module is configured to: after the cell is established, decide to turn off the multiple input multiple output (MIMO) transmit antenna of the cell or When the transmit diversity antenna of the cell performs power saving, the sending module is notified; the sending module is configured to: instruct the base station to activate the transmit diversity of the cell according to the notification of the decision module. Preferably, the sending module is configured to: instruct the base station to deactivate the transmit diversity of the cell by sending a cell reconfiguration message to the base station. Preferably, the determining module is configured to: notify the sending module when determining to enable the MIMO transmitting antenna of the cell or the transmit diversity antenna of the cell to save energy;

 The sending module is configured to: instruct the base station to activate the transmit diversity of the cell according to the notification of the decision module.

 Preferably, the sending module is configured to: instruct the base station to activate the transmit diversity of the cell by sending a cell reconfiguration message to the base station.

The invention can flexibly configure the MIMO mode or common transmit diversity of the base station cell, not only meets the high-speed data requirement of the user, but also can close a transmitting antenna at a timely time to achieve the purpose of energy saving.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an architectural diagram of UTRAN; FIG. 2 is a technical schematic diagram of MIMO; FIG. 3 is a technical schematic diagram of transmit diversity; FIG. 4 is a configuration flow of current cell transmit diversity; FIG. The flow chart is a flow for deactivating the transmit diversity to disable the cell MIMO mode by using the cell reconfiguration message. FIG. 6 is a flowchart of Embodiment 2 of the present invention, which is used to activate the transmit diversity by the cell reconfiguration message to enable the cell MIMO mode. FIG. A schematic diagram of a radio network controller in accordance with an embodiment of the present invention.

Preferred embodiment of the invention As can be seen from FIG. 1, one RNC can control multiple NodeBs, and one NodeB generally includes one BBU and multiple RUs, so if the power consumption of the RU can be saved, the power consumption of the entire UTRAN is greatly reduced.

HSDPA (High Speed Downlink Packet Access) is a technology proposed by 3GPP (3rd Generation Partnership Project) in Release 5 (Release-5) to improve downlink. Directional (network-to-terminal) network data throughput, designed for cell and single-user downlink peak rates of up to 14.4 Mbps. Subsequently, in order to make the downlink peak rate higher, HSPA+ (HSPA Plus) technology was introduced, including Downstream 64QAM (Quadature Amplitude Modulation) high-order modulation and MIMO (Multi Input Multi Output) antenna technology proposed in Release 7 (Release-7), and in Release 8 (Release-8) The proposed DC (multi-carrier) HSDPA technology, and the DC HSDPA+MIMO technology proposed in Release 9 (Release-9).

MIMO utilizes multiple antennas to suppress channel fading, which improves radio channel capacity and spectrum utilization without increasing bandwidth. After the introduction of MIMO, the cell and single-user peak rate is 28.8 Mbps in the case of MIMO+16QAM, and 43.2 Mbps in the case of MIMO+64QAM. However, in order to support MIMO technology, the transmitting end needs to modulate data to two unrelated antennas for simultaneous transmission, and the receiver also needs to simultaneously receive data from two unrelated antennas and perform demodulation. The technical principle of MIMO is shown in 3GPP TS 25.214.

There are two ways to configure MIMO pilots on two antennas: One antenna transmits P-CPICH in the modulation mode of Antennal (Antenna 1).

Common Pilot Channel, the other common antenna transmits P-CPICH channel data in the modulation mode of Antenna2 (antenna 2), that is, the dominant frequency-dominant frequency mode (P/P pilot); The antenna transmits P-CPICH and S-CPICH (Secondary Common Pilot Channel) data in the modulation mode of Antennal, that is, the pilot frequency-tuning frequency mode (P/S pilot).

The transmit diversity of a cell is to use the multiple antennas of the same base station to transmit the same signal. Go, transmit diversity can improve the reliability of transmission, can suppress signal fading, and then obtain diversity gain. The technical principle is shown in Figure 3. As can be seen from FIG. 2 and FIG. 3, two sets of RUs (Radio Frequency Processing Units) are required to implement MIMO or transmit diversity. If there is no user configured in the MIMO cell as the MIMO mode, or the user configured in the MIMO mode does not need to use the MIMO mode, then one transmitting antenna that turns off MIMO becomes a single antenna transmission, which will bring considerable Energy saving gain. Turning off a transmit antenna means that a set of RUs can be completely shut down, which has the advantage of saving the power consumption of the base station, but its disadvantage is that MIMO users cannot experience the high-speed data throughput of MIMO or the users who support transmit diversity cannot experience it. The gain from the transmit diversity. To this end, the second antenna of the MIMO or the transmit diversity cell is dynamically turned off/on according to the user's requirements, which can meet the needs of the user and achieve the purpose of energy saving. MIMO for P/P pilot configuration is achieved by activating transmit diversity (in this case, the power of the dominant frequency configuration is the power sum of the two pilots). Similarly, the transmit diversity of a cell is also implemented by a method of activating transmit diversity. In the existing protocol, the transmit diversity can be activated when the cell is established. As shown in FIG. 4, it is a configuration process of the current cell transmit diversity, and includes the following steps: Step 4010: The RNC initiates a cell setup request message to the NodeB, where the message indicates that the transmit is activated. separation;

Step 4020: The NodeB performs cell establishment according to parameters configured by the RNC in the cell setup request message, and returns a cell setup response message to the RNC after completion. In the prior art, for the scenario of MIMO and common transmit diversity of the P/P pilot configuration, after the second transmit antenna of the cell is closed, since the transmit diversity is not deactivated, the cell still transmits in the transmit diversity manner. As a result, the coverage radius of the cell is reduced, and the coverage of the original cell cannot be maintained. The basic idea of the present invention is to dynamically turn off/on the second transmit antenna in a manner of deactivating/activating transmit diversity according to the MIMO of the P/P pilot configuration or in the normal cell transmit diversity scenario. Specifically, in the present invention, after the cell is established, when the RNC decides to turn off the MIMO transmit antenna of the cell to save energy, the cell MIMO mode is disabled by deactivating the transmit diversity of the cell; and/or, after the cell is established, the RNC decides to close the cell. When transmitting the diversity antenna to save energy, go through The transmit diversity of the cell is activated to turn off the transmit diversity of the cell. When the RNC decides to turn on the MIMO transmit antenna of the cell, the MIMO mode of the cell may be activated by activating the transmit diversity of the cell; when the RNC decides to turn on the transmit diversity antenna of the cell, the transmit diversity of the cell is activated to enable the cell transmit diversity. The transmit diversity of the cell may be deactivated or activated by reconfiguring the cell (through the cell reconfiguration message).

Embodiment 1 As shown in FIG. 5, the process of deactivating the transmit diversity to disable the cell MIMO mode by using the cell reconfiguration message includes the following steps: Step 5010: The RNC decides to close the MIMO transmit antenna of the cell, and the RNC sends a cell reconfiguration message to the NodeB. In the message, the transmit diversity of the deactivated cell is indicated; Step 5020: The NodeB receives the cell reconfiguration message of the RNC, deactivates the transmit diversity according to the configuration requirement of the RNC, and achieves the purpose of turning off the MIMO mode, and returns the cell weight to the RNC after completion. With response.

Embodiment 2 As shown in FIG. 6, the process of starting a cell MIMO mode by using a cell reconfiguration message to activate transmit diversity: Step 6010: The RNC decides to enable a MIMO transmit antenna of a cell, and the RNC sends a cell reconfiguration message to the NodeB, and the message indicates activation. Transmit diversity of the cell; Step 6020: The NodeB receives the cell reconfiguration message of the RNC, activates the transmit diversity according to the configuration requirement of the RNC, and achieves the purpose of enabling the MIMO mode. Upon completion, the RNC returns the cell to the RNC.

The above Embodiment 1 and Embodiment 2 are MIMO for P/P pilot configuration. Due to the P/S guide Frequency-configured MIMO is not implemented by activating transmit diversity, so it is possible to directly turn off an antenna without reconfiguring the cell.

The process of deactivating the transmit diversity by the cell reconfiguration message to close the transmit diversity of the cell includes the following steps: Step 7010: The RNC decides to close the transmit diversity antenna of the cell, and the RNC sends a cell reconfiguration message to the NodeB, where the message indicates Activating the transmit diversity of the cell; Step 7020: The NodeB receives the cell reconfiguration message of the RNC, and deactivates the transmit diversity according to the configuration requirement of the RNC, so as to achieve the purpose of closing the transmit diversity of the cell.

The process of activating the transmit diversity by using the cell reconfiguration message to enable the transmit diversity of the cell includes the following steps: Step 8010: The RNC decides to enable the transmit diversity antenna of the cell, and the RNC sends a cell reconfiguration message to the NodeB, where the message indicates the activated cell. Transmit diversity; Step 8020: The NodeB receives the cell reconfiguration message of the RNC, activates the transmit diversity according to the RNC configuration requirement, and achieves the purpose of enabling the transmit diversity.

The base station energy-saving control system of the embodiment of the present invention includes an RNC and a NodeB, where: the RNC is configured to: after the cell is established, when the cell is determined to turn off the MIMO transmit antenna of the cell or the transmit diversity antenna of the cell to save energy, instruct the NodeB to deactivate the cell. Transmit diversity; the NodeB is configured to: deactivate the transmit diversity of the cell according to the indication of the RNC to turn off the MIMO mode of the cell or turn off the transmit diversity of the cell. Preferably, the RNC is configured to: send a cell reconfiguration message to the NodeB, Instructs the NodeB to deactivate the transmit diversity of the cell. Preferably, the RNC is further configured to: when deciding to turn on a MIMO transmit antenna of a cell or a transmit diversity antenna of a cell, instructing the NodeB to activate transmit diversity of the cell; the NodeB is further configured to: activate transmit diversity of the cell according to the indication of the RNC, To turn on the MIMO mode of the cell or turn on the transmit diversity of the cell. Preferably, the RNC is configured to: instruct the NodeB to activate the transmit diversity of the cell by sending a cell reconfiguration message to the NodeB.

As shown in FIG. 7, the radio network controller includes a decision module 71 and a sending module 72, where: the decision module 71 is configured to: after the cell is established, decide to close the MIMO transmit antenna of the cell or the transmit diversity of the cell. When the antenna performs power saving, the sending module 72 is notified; the sending module 72 is configured to: instruct the NodeB to deactivate the transmit diversity of the cell according to the notification by the decision module 71. Preferably, the sending module 72 is configured to: instruct the NodeB to deactivate the transmit diversity of the cell by sending a cell reconfiguration message to the NodeB. Preferably, the determining module 71 is configured to: notify the sending module 72 when determining to enable the MIMO transmitting antenna of the cell or the transmit diversity antenna of the cell to save power; the sending module 72 is configured to: according to the determining module 71 The notification instructs the NodeB to activate the transmit diversity of the cell. Preferably, the sending module 72 is configured to: instruct the NodeB to activate the transmit diversity of the cell by sending a cell reconfiguration message to the NodeB.

The present invention is applicable to other multi-antenna transmission systems in addition to the UMTS system, which is not limited by the present invention. One of ordinary skill in the art can understand that all or part of the above steps can be completed by a program to instruct related hardware, and the program can be stored in a computer readable storage medium, such as read only. Memory, disk or disc, etc. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the foregoing embodiment may be implemented in the form of hardware, or may be implemented in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software. While the invention has been described in connection with the specific embodiments, the modifications and the modifications Such modifications and variations are considered to be within the scope of the invention and the scope of the appended claims.

INDUSTRIAL APPLICABILITY The present invention provides a method, system, and radio network controller for controlling energy saving of a base station, and deactivates/activates a transmit diversity of a cell by cell reconfiguration to disable/turn on a MIMO mode of a cell or turn off/turns on a cell. The transmit diversity can not only satisfy the experience of MIMO users or transmit diversity users, but also save the base station's energy consumption at an appropriate time.

Claims

Claim A method for controlling energy saving of a base station, comprising: after a cell is established, when a radio network controller (RNC) decides to turn off a multiple input multiple output (MIMO) transmit antenna of a cell to save energy, by deactivating a transmit diversity of a cell to close a cell MIMO mode; and/or, after the cell is established, the RNC decides to turn off the transmit diversity antenna of the cell to save energy, and deactivates the transmit diversity of the cell by deactivating the transmit diversity of the cell. 2. The method of claim 1, wherein: in the step of deactivating transmit diversity of the cell, the transmit diversity of the cell is deactivated by reconfiguring the cell. 3. The method according to claim 1 or 2, wherein: the step of deactivating the MIMO mode of the cell by deactivating the transmit diversity of the cell comprises: The RNC sends a cell reconfiguration message to the base station, and the cell reconfiguration message is used to indicate that the base station deactivates the transmit diversity of the cell; the base station receives the RCC to send a cell reconfiguration message, and activates the transmit diversity according to the RNC indication to the RNC. Returns the cell reconfiguration response. 4. The method according to claim 1, wherein: after deactivating a transmit diversity of a cell to turn off a MIMO mode of the cell, the method further comprises: when the RNC decides to turn on the MIMO transmit antenna of the cell, by activating transmit diversity of the cell After the MIMO mode of the cell is turned on; after deactivating the transmit diversity of the cell to turn off the transmit diversity of the cell, the method further includes: when the RNC decides to turn on the transmit diversity antenna of the cell, the cell transmit diversity is enabled by activating the transmit diversity of the cell. 5. The method of claim 4, wherein: in the step of activating transmit diversity of the cell, the transmit diversity of the activated cell is activated by reconfiguring the cell. 6. The method according to claim 4 or 5, wherein: the step of enabling the MIMO mode of the cell by activating the transmit diversity of the cell comprises: The RNC sends a cell reconfiguration message to the base station, and the cell reconfiguration message is used to indicate that the base station activates the transmit diversity of the cell; the base station receives the RCC to send a cell reconfiguration message, activates the transmit diversity according to the indication of the RNC, and returns the cell to the RNC. Reassign the response. 7. A base station energy-saving control system, comprising a radio network controller (RNC) and a base station, wherein:  The RNC is configured to: after the cell is established, when the cell is determined to turn off the multi-input multi-output (MIMO) transmit antenna of the cell or the transmit diversity antenna of the cell to save energy, instruct the base station to deactivate the transmit component of the cell. The base station is configured to: deactivate the transmit diversity of the cell according to the indication of the RNC to turn off the MIMO mode of the cell or turn off the transmit diversity of the cell. 8. The system of claim 7, wherein: the RNC is configured to: instruct the base station to activate transmit diversity of the cell by transmitting a cell reconfiguration message to the base station. 9. The system according to claim 7, wherein: the RNC is further configured to: when deciding to turn on a MIMO transmit antenna of a cell or a transmit diversity antenna of a cell, instructing the base station to activate transmit diversity of the cell; the base station is further configured to: The transmit diversity of the cell is activated according to the indication of the RNC to enable the MIMO mode of the cell or to enable the transmit diversity of the cell. 10. The system of claim 9, wherein: the RNC is configured to: instruct the base station to activate transmit diversity of the cell by transmitting a cell reconfiguration message to the base station. A radio network controller, comprising: a decision module and a sending module, wherein: the decision module is configured to: after the cell is established, determine to close the multi-input and multi-output of the cell When the (MIMO) transmit antenna or the transmit diversity antenna of the cell performs power saving, the sending module is notified; the sending module is configured to: instruct the base station to activate the transmit diversity of the cell according to the notification of the decision module. 12. The radio network controller of claim 11, wherein: the transmitting module is configured to: instruct the base station to deactivate a transmit diversity of the cell by transmitting a cell reconfiguration message to the base station. The radio network controller according to claim 11, wherein: the determining module is configured to: notify the sending module when determining to enable a MIMO transmitting antenna of a cell or a transmit diversity antenna of a cell to save energy; And being configured to: according to the notification of the decision module, instruct the base station to activate transmit diversity of the cell. 14. The radio network controller of claim 13, wherein: the transmitting module is configured to: instruct the base station to activate transmit diversity of the cell by transmitting a cell reconfiguration message to the base station.