CN106455090B - Uplink signal transmission method of LTE cluster terminal - Google Patents
Uplink signal transmission method of LTE cluster terminal Download PDFInfo
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- CN106455090B CN106455090B CN201510491247.2A CN201510491247A CN106455090B CN 106455090 B CN106455090 B CN 106455090B CN 201510491247 A CN201510491247 A CN 201510491247A CN 106455090 B CN106455090 B CN 106455090B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
Abstract
The application discloses an uplink signal transmission method of an LTE cluster terminal, which comprises the following steps: the terminal receives uplink physical resources, a modulation mode and a power requirement distributed by the base station, if the distributed uplink physical resources are Resource Blocks (RBs) smaller than or equal to a set size and a modulation order of the modulation mode indicated by the base station is smaller than or equal to a set order threshold, the terminal increases the maximum output power of uplink transmission according to a preset maximum power boost MPE parameter, and determines the actual output power of the uplink transmission according to the increased maximum output power and the power requirement indicated by the base station; and processing and transmitting the uplink signal according to the determined actual output power and the uplink physical resource and modulation mode allocated by the base station. By applying the method and the device, uplink coverage can be enlarged, and cost of stations and equipment is reduced.
Description
Technical Field
The present application relates to a trunking communication technology, and in particular, to an uplink signal transmission method for an LTE trunking terminal.
Background
In 2G trunking communication, in order to increase the uplink transmission power of a terminal, the uplink transmission of the terminal generally adopts constant envelope modulation, so that a power amplifier can work in a saturation state, and a handheld terminal can realize the transmission power of 2W to 5W.
However, when the current LTE trunking terminal performs trunking or small data communication, the maximum power of the current LTE trunking terminal is generally designed according to 23dBm, so that the uplink coverage of the LTE trunking terminal may be smaller than that of the conventional trunking terminal.
The LTE uplink signal adopts an SC-FDMA modulation mode, and the power amplifier works in an approximate linear state. However, when the signal bandwidth is large and the modulation order is high, the modulation signal degradation and adjacent channel interference caused by the nonlinearity of the Power amplifier are increased, so the mpr (maximum Power reduction) is defined by the 3GPP protocol, and the Power of the terminal can be reduced when a large bandwidth and a high-order mode are allowed. The following is a description of MPR by 3GPP 36.101:
For UE Power Class 3,the allowed Maximum Power Reduction(MPR)for themaximum output power due to higher order modulation and transmit bandwidthconfiguration(resource blocks)is specified in following table.
Maximum Power Reduction(MPR)for Power Class 3
however, when the terminal uses a lower bandwidth, whether the power can be increased is not specified, and the maximum power is still designed according to 23dBm, which may result in that the uplink coverage of the LTE trunking terminal may be smaller than that of the conventional trunking terminal, and at the same time, the uplink coverage is smaller, which also increases the cost of the station and the equipment.
Disclosure of Invention
The application provides an uplink signal transmission method of an LTE cluster terminal, which can enlarge uplink coverage and reduce cost of stations and equipment.
In order to realize the above, the following technical scheme is adopted in the application:
an uplink signal transmission method of an LTE cluster terminal comprises the following steps:
the terminal receives uplink physical resources, a modulation mode and a power requirement distributed by the base station, if the distributed uplink physical resources are Resource Blocks (RBs) smaller than or equal to a set size and a modulation order of the modulation mode indicated by the base station is smaller than or equal to a set order threshold, the terminal increases the maximum output power of uplink transmission according to a preset maximum power boost MPE parameter, and determines the actual output power of the uplink transmission according to the increased maximum output power and the power requirement indicated by the base station;
and processing and transmitting the uplink signal according to the determined actual output power and the uplink physical resource and modulation mode allocated by the base station.
Preferably, when the terminal performs an uplink trunking voice or small data service, and the base station determines that the terminal is located at a cell coverage remote point, the uplink physical resource allocated to the terminal is a resource block RB with a size smaller than or equal to a set size, and indicates a modulation mode with a modulation order smaller than or equal to a set order threshold to the terminal.
Preferably, the base station determines whether the terminal is located at a cell coverage remote point according to an uplink channel measurement result.
According to the technical scheme, the terminal receives uplink physical resources, modulation modes and power requirements distributed by the base station, when the uplink physical resources distributed by the base station are small RBs and the indicated modulation mode is low-order modulation, the terminal starts a preset maximum power boost MPE parameter, improves the maximum output power, and determines the actual output power of uplink transmission according to the improved maximum output power and the power requirements sent by the base station; and the terminal processes and transmits the uplink signal according to the determined actual output power and the uplink physical resource and modulation mode allocated by the base station. Through the above processing, the terminal can increase the maximum output power when the uplink resource is a small RB and the low-order modulation is performed, thereby enlarging the uplink coverage, and after the single-station coverage radius is increased, the costs of the station and the equipment can be further reduced.
Drawings
Fig. 1 is a schematic basic flow chart of an uplink signal transmission method in the present application.
Detailed Description
For the purpose of making the objects, technical means and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings.
As described in the background art, when the terminal uses a lower bandwidth, the uplink coverage of the LTE trunking terminal may be smaller than that of the conventional trunking terminal, and meanwhile, the uplink coverage is smaller, so the costs of the station and the equipment are also increased. In view of the above problems, the applicant further evaluates the power amplifier, and finds that, under a small RB (for example, an uplink bandwidth is smaller than 3RB) bandwidth in a lower order modulation mode, the uplink transmission power of the LTE trunking terminal can be further increased, and after the power is increased, the performance index of transmission (for example, EVM, ACLR, spurious, etc.) can still be met.
Based on the analysis, the application provides an uplink signal transmission method of an LTE cluster terminal, maximum power boost (MPE) parameters are introduced, and the MPE parameters are started to improve the maximum output power of the terminal when uplink resources and a modulation mode meet certain conditions, so that the purpose of expanding uplink coverage is achieved.
Fig. 1 is a detailed flowchart of an uplink signal transmission method of an LTE trunking terminal in the present application. As shown in fig. 1, the method includes:
Preferably, the configuration may be performed according to the hardware characteristics of the terminal, such as setting the MPE parameter to be 2dB or 3dB higher.
And 102, the terminal receives the uplink transmission resource and the indicated modulation mode sent by the base station, and determines that the uplink physical resource is an RB (radio block) which is distributed to the terminal and is smaller than or equal to a set size k as the uplink transmission resource, the base station indicates the modulation mode and indicates the terminal to adopt the modulation mode of which the modulation order is smaller than or equal to a set order threshold value for uplink transmission. And increasing the maximum output power of uplink transmission according to the MPE parameters.
And 102, the terminal receives the uplink transmission resource and the indicated modulation mode sent by the base station, and increases the maximum output power of uplink transmission according to the MPE parameters when the uplink physical resource is determined to be a resource block RB smaller than or equal to the set size and the modulation order of the modulation mode indicated by the base station is smaller than or equal to the set order threshold.
And after receiving the uplink transmission resource and the indicated modulation mode, the UE judges the size of the transmission resource and the modulation order of the modulation mode, and if the uplink transmission resource allocated by the base station belongs to a small RB and the base station indicates to adopt the low-order modulation mode, the UE starts MPE parameters and improves the maximum output power of uplink transmission according to the parameters. For example, if the MPE parameter is raised by 2dB, the terminal raises the maximum output power of uplink transmission by 2 dB.
The small RB may be an RB resource whose transmission resource size is smaller than or equal to a set size k, and the low-order modulation may be a modulation scheme whose modulation order is smaller than or equal to a set order threshold m. Specifically, the two thresholds k and m defining whether to be the small RB and the low-order modulation may be performed according to hardware characteristics of the terminal and the base station, for example, k may be set to 3, and the set order threshold m may be 2, that is, when the modulation scheme is a QPSK or a lower-order modulation scheme, enabling of the MPE parameter may be considered.
In addition, in order to achieve the purpose of increasing uplink transmission power for the cell edge UE, so as to more effectively expand uplink coverage, preferably, when the terminal performs uplink trunking voice or small data service, if the base station determines that the UE is at a far point of the cell coverage, the base station may allocate RB resources meeting the small RB condition to the UE, and instruct the UE to use a low-order modulation mode. Thus, the UE can be prompted to start the MPE parameters, and the maximum output power can be improved. Further preferably, the base station may perform the uplink channel measurement according to the uplink channel measurement result when determining whether the terminal is at a far point covered by the cell
And 103, processing and transmitting the uplink signal according to the determined actual output power and the uplink physical resource and modulation mode allocated by the base station.
So far, the flow of the uplink signal transmission method of the LTE trunking terminal in the application is finished. By the mode, the uplink transmission power can be improved by introducing the MPE parameters, so that the uplink coverage is enlarged, and the cost of sites and equipment is reduced.
The method in the application is applied to test the uplink transmission of the LTE terminal. Table 1 shows performance test data obtained from an LTE terminal, and as can be seen from table 1, when an MPE takes effect, the modulation performance EVM of the terminal is deteriorated, but the modulation accuracy requirement is still met, and the ACLR index also meets the protocol requirement. Therefore, by the processing method of the present application, when the small RB and low order modulation conditions are satisfied, the terminal can be configured to raise the transmission power, thereby expanding the uplink coverage and reducing the station and equipment costs. Specifically, if the transmit power is boosted by MPE by 2dB, the coverage radius can be increased by about 14% according to the Cost-231 propagation model, and for voice coverage dominated networks, the single station coverage area can be increased by about 30%, thereby reducing the station and equipment Cost by about 30%.
TABLE 1
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, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (3)
1. An uplink signal transmission method of an LTE cluster terminal is characterized by comprising the following steps:
the method comprises the steps that a terminal receives uplink physical resources, a modulation mode and power requirements distributed by a base station, if the distributed uplink physical resources are Resource Blocks (RBs) smaller than or equal to a set size and a modulation order of the modulation mode indicated by the base station is smaller than or equal to a set order threshold value, the terminal determines the maximum output power of uplink transmission according to the power level specified by an LTE protocol, increases the maximum output power of the uplink transmission according to a preset maximum power boost (MPE) parameter, and determines the actual output power of the uplink transmission according to the boosted maximum output power and the power requirements indicated by the base station;
and processing and transmitting the uplink signal according to the determined actual output power and the uplink physical resource and modulation mode allocated by the base station.
2. The method of claim 1, wherein when a terminal performs uplink trunking voice or small data service, and the base station determines that the terminal is located at a cell coverage far point, the uplink physical resource allocated to the terminal is a resource block RB with a size less than or equal to a set size, and indicates to the terminal a modulation scheme with a modulation order less than or equal to a set order threshold.
3. The method of claim 2, wherein the base station determines whether the terminal is located at a cell coverage remote point according to the uplink channel measurement result.
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| CN201510491247.2A CN106455090B (en) | 2015-08-12 | 2015-08-12 | Uplink signal transmission method of LTE cluster terminal |
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| CN201510491247.2A CN106455090B (en) | 2015-08-12 | 2015-08-12 | Uplink signal transmission method of LTE cluster terminal |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101741437A (en) * | 2008-11-19 | 2010-06-16 | 中国移动通信集团公司 | Uplink power control method, system and equipment |
| CN102045826A (en) * | 2010-12-10 | 2011-05-04 | 中兴通讯股份有限公司 | Method and device for processing uplink inter-cell interference |
| CN102348268A (en) * | 2010-08-03 | 2012-02-08 | 中兴通讯股份有限公司 | Uplink power control method and system of LTE (Long Term Evolution) system |
| CN104080157A (en) * | 2013-03-29 | 2014-10-01 | 普天信息技术研究院有限公司 | Uplink power control method for trunking terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2693815A1 (en) * | 2012-08-03 | 2014-02-05 | Panasonic Corporation | Power headroom reporting for in-device coexistence interference avoidance |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101741437A (en) * | 2008-11-19 | 2010-06-16 | 中国移动通信集团公司 | Uplink power control method, system and equipment |
| CN102348268A (en) * | 2010-08-03 | 2012-02-08 | 中兴通讯股份有限公司 | Uplink power control method and system of LTE (Long Term Evolution) system |
| CN102045826A (en) * | 2010-12-10 | 2011-05-04 | 中兴通讯股份有限公司 | Method and device for processing uplink inter-cell interference |
| CN104080157A (en) * | 2013-03-29 | 2014-10-01 | 普天信息技术研究院有限公司 | Uplink power control method for trunking terminal |
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