News Column

Researchers Submit Patent Application, "Method and Device for Reducing Transmission Power of Uplink Signal", for Approval

August 27, 2014



By a News Reporter-Staff News Editor at Electronics Newsweekly -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventors Lin, Zhirong (Shenzhen, CN); Dai, Bo (Shenzhen, CN); Yu, Bin (Shenzhen, CN); Ren, Lu (Shenzhen, CN), filed on June 6, 2012, was made available online on August 14, 2014.

The patent's assignee is Zte Corporation.

News editors obtained the following quote from the background information supplied by the inventors: "As an evolved version of LTE, LTE-A is intended to meet a higher demand and more applications in the wireless communication market over the next few years, to meet and surpass a demand of International Mobile Telecommunications-Advanced (IMT-Advanced), and meanwhile to keep a better backward compatibility to LTE.

"To meet the demand of IMT-Advanced, a Carriers Aggregation (CA) technology is adopted in LTE-A to further support a wider communication bandwidth than that of LTE. The main principle of the CA is that a maximum bandwidth of 100 MHz can be supported by aggregating multiple carriers which are backward compatible to LTE. The CA includes two application scenarios: Inter-band CA and Intra-band CA.

"In a system where the CA is introduced, a carrier which is aggregated is referred to as a Component Carrier (CC), and also as a Cell. Furthermore, concepts of a Primary Component Carrier/Cell (PCC/PCell) and a Secondary Component Carrier/Cell (SCC/SCell) are proposed. In a system where carriers are aggregated, there are at least one PCC/PCell and one SCC/SCell, wherein the PCC/PCell is always at the activated state.

"When the CA is an Inter-band CA, a User Equipment (UE) has multiple Power Amplifiers (PAs) to support simultaneous transmissions of user uplink signals on multiple CCs located on multiple frequency bands, at this point, uplink signals on each CC are sent by pre-configured PAs.

"In an Intra-band CA scenario, when uplink signals on multiple CCs are sent simultaneously, if the total transmission power of the uplink signals on the multiple CCs exceeds a maximum linear power supported by a PA, a power reduction is performed on all the uplink signals, to ensure that the sum of transmission powers of all the uplink signals does not exceed the maximum linear power supported by the PA.

"However, in an Inter-band CA scenario, since a UE has multiple PAs, and uplink signals on a specific CC are sent by a pre-configured PA, an evolved Node B (eNB) configures a maximum transmission power of a CC carried by the PA according to the capability of the PA, this may result in the case that a total transmission power of uplink signals on one or more PAs exceeds the maximum linear power of the PA and a power reduction is needed, while a total power of uplink signals on other PAs does not exceed the maximum linear power of the PA and a power reduction is not needed.

"The power reduction formula, in TS 36.213 Release 10 of the current LTE standard, is established based on an Intra-band CA scenario. If a power reduction in an Inter-band CA scenario is performed according to the power reduction formula in TS 36.213 Release 10, transmission powers of uplink signals carried by CCs, on which a power reduction does not have to performed, will be reduced, thus lowering covering capabilities and reliabilities of uplink signals, whilst lowering a utilization rate of a UE's uplink transmission power."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "In view of the above, the present disclosure provides a method and a device for reducing the transmission power of a uplink signal, so as to improve the covering capability and reliability of the uplink signal in an Inter-band CA scenario, and to improve a utilization rate of a UE's uplink transmission power.

"Therefore, the technical solutions of the present disclosure are implemented as follows.

"The present disclosure provides a method for reducing the transmission power of an uplink signal, comprising:

"a UE performs Component Carrier (CC) grouping on configured uplink CCs; and

"the transmission power of an uplink signal in each CC group is compared correspondingly with a maximum transmission power configured for each CC group by an evolved Node B (eNB), a power reduction is performed within the CC group when the comparison result meets a intra-group power reduction condition.

"In the above technical solution, the UE performing CC grouping on configured uplink CCs comprises: the UE performs CC grouping according to a specified signaling or performs CC grouping according to a pre-defined CC grouping method.

"In the above technical solution, the performing CC grouping according to a pre-defined CC grouping method comprises:

"CCs in a successive frequency band are classified into one CC group; or CCs using a same Power Amplifier (PA) are classified into one CC group; or CCs with a frequency difference between their used frequency points smaller than a frequency difference threshold pre-defined between a base station and the UE, are classified into one CC group.

"In the above technical solution, the intra-group power reduction condition that the comparison result meets comprises: the transmission powers of one or more uplink signals in the CC group exceeds the maximum transmission power configured for the CC group by the eNB.

"In the above technical solution, the performing a power reduction within the CC group comprises:

"when an uplink signal in a CC group exceeding a maximum transmission power configured for the CC group by an eNB includes both Physical Uplink Shared Channels (PUSCHs) and Physical Uplink Control Channels (PUCCHs), transmission powers of all PUSCHs are multiplied by a same power reduction coefficient to reduce the transmission powers of all the PUSCHs with an equal proportion, until that the transmission power of the uplink signal in the CC group does not exceed the maximum transmission power configured for the CC group by the eNB;

"when the uplink signal in the CC group exceeding the maximum transmission power configured for the CC group by the eNB includes both PUSCHs and PUCCHs, and a part of the PUSCHs carry Uplink Control Information (UCI), other PUSCHs carry only user data, transmission powers of all the PUSCHs carrying only user data are multiplied by a same power reduction coefficient to reduce the transmission powers of all the PUSCHs carrying only user data with an equal proportion, until that the transmission power of the uplink signal in the CC group does not exceed the maximum transmission power configured for the CC group by the eNB;

"when the uplink signal in the CC group exceeding the maximum transmission power configured for the CC group by the eNB includes more than one PUSCHs, and a part of the PUSCHs carry UCI, other PUSCHs carry only user data, transmission powers of all the PUSCHs carrying only user data are multiplied by a same power reduction coefficient to reduce the transmission powers of all the PUSCHs carrying only user data with an equal proportion, until that the transmission power of the uplink signal in the CC group does not exceed the maximum transmission power configured for the CC group by the eNB;

"when the uplink signal in the CC group exceeding the maximum transmission power configured for the CC group by the eNB includes more than one PUSCHs carrying only user data, transmission powers of all the PUSCHs are multiplied by a same power reduction coefficient to reduce the transmission powers of all the PUSCHs with an equal proportion, until that the transmission power of the uplink signal in the CC group does not exceed the maximum transmission power configured for the CC group by the eNB; and

"when the uplink signal in the CC group exceeding the maximum transmission power configured for the CC group by the eNB includes more than one Sounding Reference Signals (SRSs), transmission powers of all the SRSs are multiplied by a same power reduction coefficient to reduce the transmission powers of all the SRSs with an equal proportion, until that the transmission power of the uplink signal in the CC group does not exceed the maximum transmission power configured for the CC group by the eNB.

"In the above technical solution, the method further comprises:

"the sum of transmission powers of uplink signals in all CC groups is compared with a maximum transmission power configured for the UE by the eNB, when the comparison result meets an inter-group power reduction condition, a power reduction is performed between the CC groups.

"In the above technical solution, the comparison result meeting the inter-group power reduction condition comprises: the sum of the transmission powers of the uplink signals in all the CC groups exceeds the maximum transmission power configured for the UE by the eNB.

"In the above technical solution, the performing a power reduction between the CC groups comprises at least one of followings:

"Way 1: after the power reduction is performed within the CC group, the transmission power of an uplink signal in a reduced CC group is reduced sequentially, until that the sum of the transmission powers of the uplink signals in all the CC groups does not exceed the maximum transmission power configured for the UE by the eNB;

"Way 2: after the power reduction is performed within the CC group, the transmission power of an uplink signal in a non-reduced CC group is reduced, until that the sum of the transmission powers of the uplink signals in all the CC groups does not exceed the maximum transmission power configured for the UE by the eNB;

"Way 3: priorities are set between the CC groups, transmission powers of uplink signals in the CC groups are reduced in order of priority, until that the sum of the transmission powers of the uplink signals in all the CC groups does not exceed the maximum transmission power configured for the UE by the eNB; and

"Way 4: priority groups are set between the CC groups, transmission powers of uplink signals in the CC groups are reduced in order of priority group, until that the sum of the transmission powers of the uplink signals in all the CC groups does not exceed the maximum transmission power configured for the UE by the eNB.

"In the above technical solution, in the ways of power reduction between the CC groups, the transmission powers of one or more CC groups are reduced.

"The present disclosure provides a method for reducing the transmission power of an uplink signal, comprising:

"a UE performs CC grouping on configured uplink CCs; and

"the sum of transmission powers of uplink signals in all CC groups is compared with a maximum transmission power configured for the UE by an eNB, when the comparison result meets an inter-group power reduction condition, a power reduction is performed between the CC groups.

"The present disclosure provides a device for reducing the transmission power of a uplink signal, comprising a CC grouping module, a reduction determination module and a reduction module, wherein

"the CC grouping module is configured to perform CC grouping on uplink CCs configured by a UE;

"the reduction determination module is configured to compare correspondingly the transmission power of an uplink signal in each CC group with a maximum transmission power configured for the each CC group by an eNB, and to notify the reduction module when the comparison result meets an intra-group power reduction condition; and

"the reduction module is configured to perform a power reduction within the CC group when the comparison result meets the intra-group power reduction condition.

"In the above technical solution, the CC grouping module is specifically configured to classify CCs in a successive frequency band into one CC group; or classify, CCs with a frequency difference of frequency points smaller than a frequency difference threshold pre-defined between a base station and the UE, into one CC group.

"In the above technical solution, the reduction module performing a power reduction within the CC group comprises:

"when an uplink signal in a CC group exceeding a maximum transmission power configured for the CC group by an eNB includes both PUSCHs and PUCCHs, the reduction module ensures preferentially transmission powers of the PUCCHs, and multiplies transmission powers of all PUSCHs by a same power reduction coefficient to reduce the transmission powers of all the PUSCHs with an equal proportion, until that the transmission power of the uplink signal in the CC group does not exceed the maximum transmission power configured for the CC group by the eNB;

"when the uplink signal in the CC group exceeding the maximum transmission power configured for the CC group by the eNB includes both PUSCHs and PUCCHs, and a part of the PUSCHs carry UCI, other PUSCHs carry only user data, the reduction module ensures preferentially transmission powers of the PUCCHs and transmission powers of the PUSCHs carrying UCI, and multiplies transmission powers of all the PUSCHs carrying only user data by a same power reduction coefficient to reduce the transmission powers of all the PUSCHs carrying only user data with an equal proportion, until that the transmission power of the uplink signal in the CC group does not exceed the maximum transmission power configured for the CC group by the eNB;

"when the uplink signal in the CC group exceeding the maximum transmission power configured for the CC group by the eNB includes more than one PUSCHs, and a part of the PUSCHs carry UCI, other PUSCHs carry only user data, the reduction module ensures preferentially transmission powers of the PUSCHs carrying UCI, and multiplies transmission powers of all the PUSCHs carrying only user data by a same power reduction coefficient to reduce the transmission powers of all the PUSCHs carrying only user data with an equal proportion, until that the transmission power of the uplink signal in the CC group does not exceed the maximum transmission power configured for the CC group by the eNB;

"when the uplink signal in the CC group exceeding the maximum transmission power configured for the CC group by the eNB includes more than one PUSCHs carrying only user data, the reduction module multiplies transmission powers of all the PUSCHs by a same power reduction coefficient to reduce the transmission powers of all the PUSCHs with an equal proportion, until that the transmission power of the uplink signal in the CC group does not exceed the maximum transmission power configured for the CC group by the eNB; and

"when the uplink signal in the CC group exceeding the maximum transmission power configured for the CC group by the eNB includes more than one SRSs, transmission powers of all the SRSs are multiplied by a same power reduction coefficient to reduce the transmission powers of all the SRSs with an equal proportion, until that the transmission power of the uplink signal in the CC group does not exceed the maximum transmission power configured for the CC group by the eNB.

"In the above technical solution, the reduction determination module is further configured to compare the sum of transmission powers of uplink signals in all CC groups with a maximum transmission power configured for the UE by the eNB, and to notify the reduction module when the comparison result meets an inter-group power reduction condition; and

"the reduction module is further configured to perform a power reduction using CC group as the unit between the CC groups when the comparison result meets the inter-group power reduction condition.

"In the above technical solution, the reduction module performs a power reduction between the CC groups by using one of followings:

"Way 1: after the power reduction is performed within the CC group, the transmission power of an uplink signal in a reduced CC group is reduced sequentially, until that the sum of the transmission powers of the uplink signals in all the CC groups does not exceed the maximum transmission power configured for the UE by the eNB;

"Way 2: after the power reduction is performed within the CC group, the transmission power of an uplink signal in a non-reduced CC group is reduced, until that the sum of the transmission powers of the uplink signals in all the CC groups does not exceed the maximum transmission power configured for the UE by the eNB;

"Way 3: priorities are set between the CC groups, the reduction is performed on transmission powers of uplink signals between the CC groups in order of priority, until that the sum of the transmission powers of the uplink signals in all the CC groups does not exceed the maximum transmission power configured for the UE by the eNB; and

"Way 4: priority groups are set between the CC groups, the reduction is performed on transmission powers of uplink signals between the CC groups in order of priority group, until that the sum of the transmission powers of the uplink signals in all the CC groups does not exceed the maximum transmission power configured for the UE by the eNB.

"The method provides a device for reducing the transmission power of a uplink signal, comprising a CC grouping module, a reduction determination module and a reduction module, wherein

"the CC grouping module is configured to perform CC grouping on uplink CCs configured by a UE;

"the reduction determination module is configured to compare the sum of transmission powers of uplink signals in all CC groups with a maximum transmission power configured for the each CC group by an eNB, and to notify the reduction module when the comparison result meets an inter-group power reduction condition; and

"the reduction module is configured to perform a power reduction using CC group as the unit between the CC groups when the comparison result meets the inter-group power reduction condition.

"The present disclosure provides a method and a device for reducing the transmission power of an uplink signal, comprising: a UE performs CC grouping on configured uplink CCs, and the transmission power of an uplink signal in each CC group is compared correspondingly with a maximum transmission power configured for the each CC group by an evolved eNB, when the comparison result meets an intra-group power reduction condition, a power reduction is performed within the CC group; and/or the sum of transmission powers of uplink signals in all CC groups is compared with a maximum transmission power configured for the UE by an eNB, when the comparison result meets a inter-group power reduction condition, a power reduction using CC group as the unit is performed between the CC groups; thus improving the covering capability and reliability of the uplink signal in an Inter-band CA scenario, and improving a utilization rate of a UE's uplink transmission power.

BRIEF DESCRIPTION OF THE DRAWINGS

"FIG. 1 shows a schematic flow chart for implementing a method for reducing the transmission power of an uplink signal according to the present disclosure;

"FIG. 2 shows a schematic flow chart for implementing a device for reducing the transmission power of an uplink signal according to the present disclosure;

"FIG. 3 shows a schematic flow chart for implementing a method for reducing the transmission power of an uplink signal according to a first embodiment of the present disclosure;

"FIG. 4 shows a schematic flow chart for implementing a method for reducing the transmission power of an uplink signal according to a second embodiment of the present disclosure;

"FIG. 5 shows a schematic flow chart for implementing a method for reducing the transmission power of an uplink signal according to a third embodiment of the present disclosure;

"FIG. 6 shows a schematic flow chart for implementing a method for reducing the transmission power of an uplink signal according to a fourth embodiment of the present disclosure;

"FIG. 7 shows a schematic flow chart for implementing a method for reducing the transmission power of an uplink signal according to a fifth embodiment of the present disclosure;

"FIG. 8 shows a schematic flow chart for implementing a method for reducing the transmission power of an uplink signal according to a sixth embodiment of the present disclosure;

"FIG. 9 shows a schematic flow chart for implementing a method for reducing the transmission power of an uplink signal according to a seventh embodiment of the present disclosure;

"FIG. 10 shows a schematic flow chart for implementing a method for reducing the transmission power of an uplink signal according to a eighth embodiment of the present disclosure;

"FIG. 11 shows a schematic flow chart for implementing a method for reducing the transmission power of an uplink signal according to a ninth embodiment of the present disclosure;"

For additional information on this patent application, see: Lin, Zhirong; Dai, Bo; Yu, Bin; Ren, Lu. Method and Device for Reducing Transmission Power of Uplink Signal. Filed June 6, 2012 and posted August 14, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=4423&p=89&f=G&l=50&d=PG01&S1=20140807.PD.&OS=PD/20140807&RS=PD/20140807

Keywords for this news article include: Electronics, Zte Corporation, Data Transmission.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


For more stories covering the world of technology, please see HispanicBusiness' Tech Channel



Source: Electronics Newsweekly


Story Tools






HispanicBusiness.com Facebook Linkedin Twitter RSS Feed Email Alerts & Newsletters