News Column

Patent Issued for Switching Method and System of Multiple Input Multiple Output Mode

July 15, 2014



By a News Reporter-Staff News Editor at Journal of Technology -- ZTE Corporation (Shenzhen, Guangdong Province, CN) has been issued patent number 8768328, according to news reporting originating out of Alexandria, Virginia, by VerticalNews editors.

The patent's inventors are Zhang, Yu (Shenzhen, CN); Cheng, Xiang (Shenzhen, CN); Liu, Lin (Shenzhen, CN); Lin, Shugong (Shenzhen, CN).

This patent was filed on December 31, 2010 and was published online on July 1, 2014.

From the background information supplied by the inventors, news correspondents obtained the following quote: "With the continuous development of communication technologies, the requirement on the rate of data transmission is becoming higher and higher. Therefore, the High Speed Downlink Packet Access (HSDPA) technology is introduced in the 3rd Generation Partnership Project (3GPP) R5, and a next generation evolution technology: the Evolved High-Speed Packet Access (HSPA+) is further provided. Compared with HSDPA, HSPA+ introduces two key technologies, one of which is the MIMO technology which is able to multiply the capacity and the spectrum efficiency of communication systems without increasing bandwidths. After the introduction of MIMO, the peak rate of a cell and a single user is 28.8 Mbps in the case of MIMO with 16 QAM, and is 43.2 Mbps in the case of MIMO with 64 QAM.

"However, in order to support the MIMO technology, a transmitter needs to modulate data to two independent antennae to be transmitted simultaneously. A receiver also needs to receive the data from two independent antennae at the same time and perform modulation for the data. Therefore, an RNC needs to configure related MIMO parameters for a NodeB and a terminal which transmit and receive data in the MIMO mode, so that both the NodeB and the terminal can process the data according to a specific modulation and demodulation method of the MIMO mode. Thus, normal operation of communication services can be ensured.

"With the global popularization of the low carbon concept, people from all walks of life are looking for environment-friendly and energy-saving methods to save energy, to meet the requirement of improving the worsening environment and to overcome the difficulty that natural resource are becoming increasingly scarce. The communication industry is not an exception. The communication industry is actively seeking methods for energy conservation and emission reduction. By saving operation cost, the goal of low carbon operation can be achieved while coping with the fierce competition to increase revenues. However, equipment energy consumption is an important part of operation cost, and thus continuous improvement on equipment energy consumption is the main way to save energy.

"FIG. 1 is a structural diagram of a Universal Terrestrial Radio Access Network (UTRAN) system according to the related art. Generally, a NodeB comprises a Base Band Unit (BBU) and a plurality of Radio Units (RU). Therefore it is an appropriate way to save the power consumption of the RUs to save the energy of a base station.

"The MIMO needs two sets of RUs, each of which process data on an antenna. Currently, in a Universal Mobile Telecommunications System (UMTS), the advantage of a cell configured in the MIMO mode is the increase of the user data throughput. However, whether a terminal user of the MIMO cell is able to apply a MIMO dual-stream method for scheduling depends on the terminal capability, the data amount of the terminal user and the Channel Quality Indicator (CQI) of the terminal user. The power consumption of the RUs will be wasted if the terminal user still applies in the MIMO mode for transmission in the case that the MIMO mode cannot be adopted.

"Therefore, in order to make judgment of the current communication environment rapidly, so that operations can be implemented when energy-saving conditions are satisfied to reduce energy consumption to the greatest extent, the NodeB needs to control the opening/closing of one of the RUs self-adaptively. That is the self-adaptively control of the opening/closing of one of the antennae which is usually an auxiliary antenna. In other words, the NodeB needs to control the MIMO mode switching of the cell. When there are not many User Equipments (UE) which need to communicate in the MIMO mode, or communication does not need to be performed in the MIMO mode because the traffic is low in the current cell, the cell can be switched from the MIMO mode to a non-MIMO mode. Conversely, the cell can be also switched from a non-MIMO mode to the MIMO mode.

"A Control RNC (CRNC) is configured to control radio resource of a cell, specifically comprising configuration information, resource status, and radio link management etc. of a cell which belongs to the NodeB.

"However, when the NodeB adjusts the MIMO mode of a cell self-adaptively, the CRNC can no longer update the MIMO mode status of the cell managed by the NodeB. This will result in inconsistent use of the current MIMO resource by the NodeB, and the UE will fail to demodulate downlink data of the NodeB. Thus communication cannot be performed normally."

Supplementing the background information on this patent, VerticalNews reporters also obtained the inventors' summary information for this patent: "The disclosure is put forward to solve the problem that after a NodeB regulate the MIMO mode of a cell self-adaptively, a CRNC cannot accurately determine the current MIMO mode status of the cell. The disclosure provides a switching method and system of a MIMO mode to solve the problem above.

"A switching method of a MIMO mode is provided according to an aspect of the disclosure.

"The switching method of the MIMO mode according to the disclosure comprises: a NodeB determining to perform MIMO mode switching for a cell; the NodeB sending a message to a Radio Network Controller (RNC) through a Node B Application Part (NBAP) layer of an lub port, which message carries a cell identifier of the cell and MIMO mode status information of the cell; and the RNC updating MIMO mode status of the cell by using the cell identifier and the MIMO mode status information.

"Further, the NodeB sending the message to the RNC through the NBAP layer of the lub port comprises: the NodeB adding a new signaling at the NBAP layer of the lub port to send the message.

"Further, the NodeB sending the message to the RNC through the NBAP layer of the lub port further comprises: the NodeB adding a new information element to a resource status indication message of the NBAP layer of the lub port to send the message.

"Further, after the NodeB determines to perform the MIMO mode switching for the cell, the method further comprises: after a predetermined time period, executing an operation of sending the message.

"Further, after the RNC updates the MIMO mode status of the cell, the method further comprises at least one of: according to the message, the RNC sending a message for managing a radio link to the NodeB; according to the message, the RNC sending a message for reconfiguring radio resource to a user equipment (UE) in a connected status in the cell; and according to the message, the RNC sending a message for reconfiguring resource of the cell to the NodeB.

"Further, performing the MIMO mode switching for the cell comprises: switching the MIMO mode of the cell to a non-MIMO mode; or switching the non-MIMO mode of the cell to the MIMO mode.

"A switching system of a MIMO mode is provided according to another aspect of the disclosure.

"The switching system of the MIMO mode according to the disclosure comprises a NodeB and a Radio Network Controller (RNC), wherein the NodeB comprises: a determination module, configured to determine to perform MIMO mode switching for a cell; and a sending module, configured to send a message to the RNC through a Node B Application Part (NBAP) layer of an lub port, wherein the message carries a cell identifier of the cell and MIMO mode status information of the cell; and the RNC comprises: an updating module, configured to update MIMO mode status of the cell by using the cell identifier and the MIMO mode status information.

"Further, the sending module comprises: a first adding sub-module, configured to add a new signaling at the NBAP layer of the lub port to send the message; and a second adding sub-module, configured to add a new information element to a resource status indication message of the NBAP layer of the lub port to send the message.

"Further, the RNC further comprises: a timing module, configured to, after the determination module determines to perform the MIMO mode switching for the cell and after a time period set by the timing module, execute an operation of sending the message.

"Further, the RNC further comprises: a first sending sub-module, configured to, according to the message, send a message for managing a radio link to the NodeB; a second sending sub-module, configured to, according to the message, send a message for reconfiguring radio resource to a User Equipment (UE) in a connected status in the cell; and a third sending sub-module, configured to, according to the message, send a message for reconfiguring resource of the cell to the NodeB.

"By the disclosure, the NodeB sends a message which carries the cell identifier and the MIMO mode status information to the RNC. This solution solves the problem that during the energy-saving process of the NodeB, after the NodeB regulate the MIMO mode of the cell self-adaptively, the CRNC cannot determine the current MIMO mode status of the cell. Thus, this solution ensures normal communication between the UE and the NodeB."

For the URL and additional information on this patent, see: Zhang, Yu; Cheng, Xiang; Liu, Lin; Lin, Shugong. Switching Method and System of Multiple Input Multiple Output Mode. U.S. Patent Number 8768328, filed December 31, 2010, and published online on July 1, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8768328.PN.&OS=PN/8768328RS=PN/8768328

Keywords for this news article include: Technology, ZTE Corporation.

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Source: Journal of Technology


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