News Column

Patent Issued for Method and Device for Adaptive Adjusting Uplink and Downlink Bandwidth

June 3, 2014



By a News Reporter-Staff News Editor at Journal of Technology -- According to news reporting originating from Alexandria, Virginia, by VerticalNews journalists, a patent by the inventors Li, Yan (Shenzhen, CN); Peng, Aihua (Shenzhen, CN); Zhao, Nan (Shenzhen, CN); Li, Feng (Shenzhen, CN), filed on November 4, 2010, was published online on May 20, 2014.

The assignee for this patent, patent number 8730900, is ZTE Corporation (Shenzhen, Guangdong Province, CN).

Reporters obtained the following quote from the background information supplied by the inventors: "Spectrum resources are basic medium of communications, but the spectrum resources are limited, which makes users hope that utilization rate of frequency spectrum can be improved furthest. The development of different radio access technologies is also to improve the utilization rate of frequency spectrum. However, the frequency spectrum and load switching between radio access technologies in the existing communication network are almost nonexistent, that is, almost no cooperative operations are existent between each other, which causes that usage of the frequency spectrum is relatively solidified and not flexible enough, and reduces the utilization rate of frequency spectrum. For example, frequency spectrum load of some radio access technologies are relatively light, but frequency spectrum load of some radio access technologies are relatively heavy, since there are no interaction and cooperation between the access technologies, flexible dynamic allocation of frequency spectrum can be not implemented. In order to solve this problem, the industry study the radio cognitive technology currently to implement dynamic adjustments of network through cognitive radio, which includes the adjustments of working parameters such as the radio access technology and frequency band in one region. However, the ultimate goal of the cognitive radio is to require that access can be implemented on different frequency bands with different radio access technologies and communications can be performed; it has very high requirements on the base station and terminal, even new network elements may be added in the existing network structure, and the technology is still at the study phase and has no complete achievable schemes currently.

"In radio communication, an uplink service and a downlink service are generally asymmetric, and in normal conditions, downlink service traffic is greater than uplink service traffic. Therefore, in certain conditions (especially in a condition of symmetric uplink and downlink bandwidth), relatively surplus uplink system bandwidth and tensive downlink system bandwidth will occur. Specifically, in a Long Term Evolution Frequency Division Duplex (LTE FDD) system, the uplink bandwidth and downlink bandwidth are usually configured symmetrically, that is, the uplink bandwidth and downlink bandwidth are identical, which may cause idle uplink system bandwidth and then lead to a decreasing utilization rate of frequency spectrum, but the downlink frequency band are insufficient and has no frequency spectrum supplement. Similarly, in a few conditions, when uplink traffic is relatively heavy, insufficient uplink bandwidth will be caused, and if there is idle bandwidth in downlink, it will cause the utilization rate of downlink frequency spectrum to reduce in a fixedly configured network.

"It can be seen that, adopting a fixed network configuration in the above scenarios can not optimize the use of frequency spectrum. In addition, the cognitive radio technology is still at the study phase and also does not consider a bandwidth coordination scenario with such kind of radio access technology. Therefore, utilization efficiency of frequency spectrum in the LTE FDD system needs to be further improved."

In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventors' summary information for this patent: "In view of this, the main object of the present invention is to provide a method and device for adaptively adjusting uplink and downlink bandwidth, to improve utilization efficiency of frequency spectrum in an LTE FDD system.

"In order to achieve the foregoing objects, the technical scheme of the present invention is implemented as follows.

"The present invention provides a method for adaptively adjusting uplink and downlink bandwidth, which comprises:

"a base station counting a usage status of the uplink and downlink bandwidth in a preset time, and obtaining a bandwidth amount .DELTA.BW.sub.DL required to be coordinated of downlink bandwidth and a bandwidth amount .DELTA.BW.sub.UL required to be coordinated of uplink bandwidth;

"the base station determining a direction, amount and location of the required change of the uplink and downlink bandwidth according to the obtained .DELTA.BW.sub.DL and .DELTA.BW.sub.UL;

"the base station carrying the determined direction, amount and location of the required change of the uplink and downlink bandwidth through residual ten bits in a logical channel message corresponding to a Physical Broadcast Channel (PBCH) and informing a terminal of the direction, amount and location.

"The base station determining the direction, amount and location of the required change of the uplink and downlink bandwidth according to the obtained .DELTA.BW.sub.DL and.DELTA.BW.sub.UL is specifically:

"when .DELTA.BW.sub.DL is less than 0, .DELTA.BW.sub.UL is greater than 0, an absolute value of .DELTA.BW.sub.DL is less than or equal to an absolute value of .DELTA.BW.sub.UL, and the absolute value of .DELTA.BW.sub.DL is greater than or equal to a certain element in a preset RB number set, the base station selecting a maximum value less than the absolute value of .DELTA.BW.sub.DL from the RB number set as coordination bandwidth to allocate to the downlink bandwidth;

"when .DELTA.BW.sub.UL is less man 0, .DELTA.BW.sub.DL is greater than 0, the absolute value of .DELTA.BW.sub.UL is less than or equal to the absolute value of .DELTA.BW.sub.DL, and the absolute value of .DELTA.BW.sub.UL is greater than or equal to a certain element in the preset RB number set, the base station selecting the maximum value less than the absolute value of .DELTA.BW.sub.UL from the RB number set as the coordination bandwidth to allocate to the uplink bandwidth.

"After the base station counting the usage status of the uplink and downlink bandwidth in the preset time, the method further comprises: the base station determining the preset RB number set according to an uplink default bandwidth configuration and a downlink default bandwidth configuration.

"The method further comprises:

"carrying identity information indicating that the coordination bandwidth is downlink borrowing or uplink borrowing, amount of borrowing bandwidth and location of borrowing bandwidth in the residual ten bits in the logical channel message corresponding to the PBCH;

"or, carrying the identity information indicating that the coordination bandwidth is downlink borrowing or uplink borrowing and the amount of borrowing bandwidth in the residual ten bits in the logical channel message corresponding to the PBCH; wherein, the location of borrowing bandwidth is pre-configured.

"After the base station sends the logical channel message corresponding to the PBCH to the terminal, the method further comprises:

"the terminal obtaining the direction, amount and location of the required change of the uplink and downlink bandwidth by parsing the logical channel message, and re-coordinating the uplink and downlink bandwidth based on this.

"The present invention further provides a device for adaptively adjusting uplink and downlink bandwidth, which comprises:

"a bandwidth counting module, configured to: count a usage status of the uplink and downlink bandwidth in a preset time, and obtain a bandwidth amount .DELTA.BW.sub.DL required to be coordinated of downlink bandwidth and a bandwidth amount .DELTA.BW.sub.UL required to be coordinated of uplink bandwidth;

"a bandwidth coordination and allocation module, configured to: determine a direction, amount and location of the required change of the uplink and downlink bandwidth according to the obtained .DELTA.BW.sub.DL and .DELTA.BW.sub.UL;

"a sending module, configured to: carry the determined direction, amount and location of the required change of the uplink and downlink bandwidth through residual ten bits in a logical channel message corresponding to a PBCH and inform a terminal of the direction, amount and location.

"The bandwidth coordination and allocation module is further configured to: when .DELTA.BW.sub.DL is less than 0, .DELTA.BW.sub.UL is greater than 0, an absolute value of .DELTA.BW.sub.DL is less than or equal to an absolute value of .DELTA.BW.sub.DL, and the absolute value of .DELTA.BW.sub.DL is greater than or equal to a certain element in a preset RB number set, select a maximum value less than the absolute value of .DELTA.BW.sub.DL from the RB number set as coordination bandwidth to allocate to the downlink bandwidth; when .DELTA.BW.sub.UL is less than 0, .DELTA.BW.sub.DL is greater than 0, the absolute value of .DELTA.BW.sub.UL is less than or equal to the absolute value of .DELTA.BW.sub.DL, and the absolute value of .DELTA.BW.sub.UL is greater than or equal to a certain element in the preset RB number set, select the maximum value less than the absolute value of .DELTA.BW.sub.UL from the RB number set as the coordination bandwidth to allocate to the uplink bandwidth.

"The device further comprises: a set determination module, configured to: after the usage status of the uplink and downlink bandwidth in the preset time is counted, determine the preset RB number set according to an uplink default bandwidth configuration and a downlink default bandwidth configuration.

"Identity information indicating that the coordination bandwidth is downlink borrowing or uplink borrowing, amount of borrowing bandwidth and location of borrowing bandwidth are carried in the residual ten bits in the logical channel message corresponding to the PBCH;

"or, the identity information indicating that the coordination bandwidth is downlink borrowing or uplink borrowing and the amount of borrowing bandwidth are carried in the residual ten bits in the logical channel message corresponding to the PBCH; and the location of borrowing bandwidth is pre-configured.

"After receiving the logical channel message, the terminal obtains the direction, amount and location of the required change of the uplink and downlink bandwidth by parsing the logical channel message, and re-coordinates the uplink and downlink bandwidth based on this. With the method and device for adaptively adjusting uplink and downlink bandwidth provided by the present invention, dynamic coordination and allocation of the uplink and downlink bandwidth in the LTE FDD system is solved, and utilization efficiency of frequency spectrum is improved. The implementation complexity of the present invention is lower, modification to the base station and terminal is smaller relative to cognitive radio technology, and a network structure will not be modified; there is a good compatibility to LTE Release8 users through Radio Resource Control (RRC) layer configuration; and Medium Access Control (MAC) layer scheduling can avoid the interference between the uplink and downlink."

For more information, see this patent: Li, Yan; Peng, Aihua; Zhao, Nan; Li, Feng. Method and Device for Adaptive Adjusting Uplink and Downlink Bandwidth. U.S. Patent Number 8730900, filed November 4, 2010, and published online on May 20, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=52&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=2588&f=G&l=50&co1=AND&d=PTXT&s1=20140520.PD.&OS=ISD/20140520&RS=ISD/20140520

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

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Source: Journal of Technology


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