CN103634804A - Frequency assignment method under adjacent frequency coexistence and network entity - Google Patents
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Abstract
The application discloses a frequency assignment method under adjacent frequency coexistence and network entity. The method comprises the following steps: a first network entity in a time division duplex (TDD) assigns a first frequency resource adjacent to a frequency division duplex (FDD) uplink frequency range in a TDD frequency range to a second network entity, wherein the first frequency resource is regarded as uplink transmission resource; the first network entity receives the uplink data sent by the second network entity on the first frequency resource; the first network entity uses the a second frequency resource adjacent to a FDD downlink frequency range in the TDD frequency range to serve as downlink transmission resource, and sends the downlink data to the second network entity on the downlink transmission resource. The technical scheme of the disclosure can prevent interference between adjacent frequencies.
Description
Technical Field
The present invention relates to wireless communication technologies, and in particular, to a frequency allocation method and a network entity under adjacent frequency coexistence.
Background
In order to meet the challenge of broadband access technology and to meet the requirement of new services, the international standardization organization 3GPP started the standardization work of Long Term Evolution (LTE) in the end of 2004. It is the largest new technology development project initiated by 3GPP in the last two years. Research in LTE includes such things as reduction in latency, higher user data rates, improvement in system capacity and coverage, and reduction in operating costs. The main performance goals of the 3GPP LTE project include: is able to provide much higher peak rates than 3G systems; improving the performance of cell edge users; the cell capacity is improved; the system delay is reduced, and the transition time from the residence state to the activation state is shortened; supporting cell coverage of an ultra-far radius; the broadband access service can be provided for high-speed mobile users; paired or unpaired frequency spectrum is supported, and various bandwidths can be flexibly configured.
LTE-Advanced is a candidate technical proposal for studying a new generation Mobile communication system (IMT-Advanced, International Mobile Telecommunications-Advanced) on the basis of LTE. The wireless Relay (Relay) is introduced into an LTE-Advanced system as a low-power and low-cost network node, has the advantage of flexible topology, and can effectively improve the spectrum efficiency of the system and expand the network coverage. According to the recent progress discussed by 3GPP for Relay, it has been determined in the LTE-Advanced system that Type 1 (Type 1) Relay is supported, and fixed Relay is prioritized. At present, large communication equipment manufacturers and mobile network operators at home and abroad invest a lot of manpower and material resources, and are dedicated to research on Relay technologies, including system simulation, pre-research, algorithm optimization and the like of Relay, so that the advanced position is obtained in the communication development of the 4G era. In many countries, it is likely that multiple operators each deploy their own LTE/LTE-a network, and thus the situation of adjacent frequency coexistence of two systems occurs. For example, a system using a Frequency Division Duplex (FDD) mode (referred to as an FDD system) and a system using a Time Division Duplex (TDD) mode (referred to as a TDD system) coexist adjacent frequencies. Therefore, when an operator carries out network planning, the problem of adjacent channel interference between two systems needs to be considered, and system throughput loss caused by coexistence is reduced as much as possible, so that spectrum resources are utilized more effectively.
Disclosure of Invention
In view of the above, the present application provides a method for allocating frequencies under adjacent channel coexistence, and provides two network entities to suppress adjacent channel interference.
The frequency allocation method under the coexistence of adjacent frequencies provided by the application comprises the following steps:
a first network entity in a Time Division Duplex (TDD) system allocates a first frequency resource adjacent to a Frequency Division Duplex (FDD) uplink frequency band in a TDD frequency band to a second network entity as an uplink transmission resource;
the first network entity receives uplink data sent by the second network entity on the first frequency resource;
and the first network entity takes a second frequency resource adjacent to an FDD downlink frequency band in a TDD frequency band as a downlink transmission resource and sends downlink data to the second network entity on the second frequency resource.
In one embodiment of the present application, the method further comprises: the first network entity indicates the allocation information of the first frequency resource to the second network entity through resource scheduling information;
the receiving, by the first network entity, the uplink data sent by the second network entity on the first frequency resource is: and the first network entity receives the uplink data sent by the second network entity on the first frequency resource according to the resource scheduling information.
In an embodiment of the present application, the first network entity is a base station, and the second network entity is a user equipment; or,
the first network entity is a base station, and the second network entity is a wireless relay; or,
the first network entity is a wireless relay, and the second network entity is user equipment.
A first network entity proposed by the present application, includes:
a resource scheduling unit, configured to allocate a first frequency resource adjacent to an FDD uplink frequency band in a TDD frequency band to a second network entity as an uplink transmission resource;
a receiving unit, configured to receive uplink data sent by a second network entity on the first frequency resource;
and the sending unit is used for taking a second frequency resource adjacent to the FDD downlink frequency band in the TDD frequency band as a downlink transmission resource and sending downlink data to the second network entity on the second frequency resource.
In an embodiment of the present application, the sending unit is further configured to indicate the first frequency resource allocated by the resource scheduling unit to the second network entity through the resource scheduling information.
In one embodiment of the present application, the first network entity is a base station or a wireless relay.
The second network entity proposed by the present application comprises:
a receiving unit, configured to receive downlink data from a first network entity on a second frequency resource adjacent to an FDD downlink frequency band in a TDD frequency band;
a sending unit, configured to send uplink data on a first frequency resource adjacent to an FDD uplink frequency band in a TDD frequency band.
In an embodiment of the present application, the sending unit sends uplink data on a first frequency resource adjacent to an FDD uplink frequency band in a TDD frequency band according to resource scheduling information from a first network entity.
In one embodiment of the present application, the second network entity is a wireless relay or a user equipment.
It can be seen from the above solution that, in the present application, a first frequency resource adjacent to an FDD uplink frequency band in the TDD system is dedicated to an uplink of the TDD system, and a second frequency resource adjacent to an FDD downlink frequency band in the TDD system is dedicated to a downlink of the TDD system, so that the frequency band adjacent to the FDD system in the TDD system is changed to be the frequency band adjacent to the TDD uplink and the FDD uplink, and the TDD downlink and the FDD downlink are adjacent, thereby meeting a requirement of a basic adjacent channel rejection ratio (ACIR) index, and suppressing adjacent channel interference.
Drawings
Fig. 1 is a schematic diagram of frequency allocation under adjacent channel coexistence in the embodiment of the present application.
Fig. 2 is an exemplary flowchart of a frequency allocation method under adjacent channel coexistence in the embodiment of the present application.
Fig. 3 is an exemplary structural diagram of a first network entity in the embodiment of the present application.
Fig. 4 is an exemplary line structure diagram of a second network entity in the embodiment of the present application.
Fig. 5 is a schematic diagram illustrating frequency allocation adjacent to an FDD uplink frequency band in a TDD frequency band based on the technical solution of the present invention and based on a conventional technical solution when a TDD system and an FDD system coexist; wherein, the left ellipse is a schematic diagram of frequency allocation adjacent to an FDD uplink frequency band in a TDD frequency band based on the technical scheme of the invention; in the right ellipse is a schematic diagram of frequency allocation adjacent to an FDD uplink frequency band in a TDD frequency band based on a conventional technical scheme.
Fig. 6 is a simulation diagram comparing system performance based on the frequency allocation shown in fig. 5.
Fig. 7 is a schematic diagram of frequency allocation adjacent to an FDD downlink frequency band in a TDD frequency band based on the technical solution of the present invention and based on the conventional technical solution when a TDD system and an FDD system coexist; wherein, the left ellipse is a schematic diagram of frequency allocation adjacent to the FDD downlink frequency band in the TDD frequency band based on the technical scheme of the invention; in the right ellipse is a schematic diagram of frequency allocation adjacent to the FDD downlink frequency band in the TDD frequency band based on the conventional technical scheme.
Fig. 8 is a simulation diagram comparing system performance based on the frequency allocation situation shown in fig. 7.
Detailed Description
Universal Mobile Telecommunications System (UMTS) terrestrial radio access implements a radio interface using two modes, TDD and FDD. The TDD mode is a duplex mode in which the transmission of uplink data and downlink data uses the same frequency resource (i.e., carrier), and uplink and downlink transmission needs to be switched according to Time, a Time unit of a physical layer is divided into an uplink Time unit and a downlink Time unit, and the Time unit of the physical layer includes a Time slot (Time S1ot, TS), an OFDM symbol in an Orthogonal Frequency Division Multiplexing (OFDM) system, and the like. The FDD mode is a duplex mode in which two separate corresponding frequency resources are used for transmission of uplink data and downlink data, and the uplink and downlink frequency intervals are generally 190 MHz. The FDD frequency band for uplink data transmission is referred to as an FDD uplink frequency band, and the FDD frequency band for downlink data transmission is referred to as an FDD downlink frequency band.
The adjacent channel interference mainly comprises: uplink to downlink interference, downlink to uplink interference, uplink to uplink interference, and downlink to downlink interference. For the situation of coexistence of adjacent frequencies of a TDD system and an FDD system, previous researches show that the most serious problem of adjacent frequency interference occurs in the interference of downlink to uplink, and the interference of TDD uplink to FDD uplink, the interference of FDD uplink to TDD uplink, the interference of TDD downlink to FDD downlink and the interference of FDD downlink to TDD downlink can meet the requirement of basic adjacent frequency rejection ratio (ACIR) indexes.
In order to suppress adjacent channel interference, in this embodiment, as shown in fig. 1, a first frequency resource adjacent to an FDD uplink frequency band in the TDD system is dedicated to the uplink of the TDD system, and a second frequency resource adjacent to an FDD downlink frequency band in the TDD system is dedicated to the downlink of the TDD system. Therefore, the frequency band of the TDD system adjacent to the FDD system is changed into that of the TDD uplink and the FDD uplink, and the TDD downlink and the FDD downlink are adjacent, so that the requirement of a basic adjacent frequency rejection ratio (ACIR) index can be met, and the adjacent frequency interference is suppressed.
Here, the uplink of the TDD system may include at least one of: uplink from the user to the base station, uplink from the wireless relay to the base station, and uplink from the user to the wireless relay; the downlink of the TDD system may include at least one of: base station to user downlink, base station to wireless relay downlink, and wireless relay to user downlink.
In order to make the technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following embodiments and the accompanying drawings.
Fig. 2 is an exemplary flowchart of a frequency allocation method under adjacent channel coexistence in the embodiment of the present application. As shown in fig. 2, the method includes the following process flow.
In step 201, a first network entity in a TDD system allocates a frequency resource (referred to as a first frequency resource for convenience of differentiation) adjacent to an FDD uplink frequency band in the TDD frequency band to a second network entity as an uplink transmission resource.
In some applications, the first network entity in this step may indicate the allocation information of the first frequency resource to the second network entity by issuing resource scheduling information, and the second network entity sends the uplink data carried on the first frequency resource to the first network entity according to the resource scheduling information.
In this embodiment, both the uplink time unit and the downlink time unit corresponding to the first frequency resource in the original TDD system can be used as the uplink data transmission time unit, i.e., the time unit from the second network entity to the first network entity. In practical applications, of course, only the uplink time unit corresponding to the first frequency resource in the original TDD system may be used as the uplink data transmission time unit, and the downlink time unit corresponding to the first frequency resource may be used as the reserved unit.
In step 203, the first network entity uses a frequency resource (referred to as a second frequency resource for easy distinction) adjacent to the FDD downlink frequency band in the TDD frequency band as a downlink transmission resource, and sends downlink data to the second network entity on the second frequency resource.
In this embodiment, both the uplink time unit and the downlink time unit corresponding to the second frequency resource in the original TDD system can be used as the downlink data transmission time unit, i.e., the time unit from the first network entity to the second network entity. Of course, in practical applications, only the downlink time unit corresponding to the second frequency resource in the original TDD system may be used as the downlink data transmission time unit, and the uplink time unit of the second frequency resource may be used as the reserved unit.
In the above embodiment, the first network entity may be a base station, and correspondingly, the second network entity may be a user equipment or a wireless relay; or the first network entity may also be a wireless relay, and correspondingly, the second network entity is a wireless device.
Fig. 3 is an exemplary structural diagram of a first network entity in the embodiment of the present application. As shown in fig. 3, the first network entity may include: a resource scheduling unit 301, a receiving unit 302, and a transmitting unit 303.
The resource scheduling unit 301 is configured to allocate a first frequency resource adjacent to an FDD uplink frequency band in a TDD frequency band to a second network entity as an uplink transmission resource. In some applications, the first network entity may indicate the allocation information of the first frequency resource to the second network entity by issuing resource scheduling information, and the second network entity sends the uplink data carried on the first frequency resource to the first network entity according to the resource scheduling information.
The receiving unit 302 is configured to receive uplink data sent by the second network entity on the first frequency resource. Corresponding to the method shown in fig. 1, in this embodiment, both the uplink time unit and the downlink time unit corresponding to the first frequency resource in the original TDD system may be used as the uplink data transmission time unit, that is, the time unit from the second network entity to the first network entity, or only the uplink time unit corresponding to the first frequency resource in the original TDD system may be used as the uplink data transmission time unit, and the downlink time unit of the first frequency resource may be used as the reserved unit, and so on.
The sending unit 303 is configured to use a second frequency resource adjacent to an FDD downlink frequency band in a TDD frequency band as a downlink transmission resource, and send downlink data to the second network entity on the second frequency resource. Corresponding to the method shown in fig. 1, in this embodiment, both the uplink time unit and the downlink time unit corresponding to the second frequency resource in the original TDD system may be used as the downlink data transmission time unit, or only the downlink time unit corresponding to the second frequency resource in the original TDD system may be used as the downlink data transmission time unit, and the uplink time unit of the second frequency resource may be used as the reserved unit, and so on.
In this embodiment, the first network entity may be a base station or a wireless relay.
Fig. 4 is an exemplary line structure diagram of a second network entity in the embodiment of the present application. As shown in fig. 4, the second network entity may include: a receiving unit 401 and a transmitting unit 402.
The receiving unit 401 is configured to receive downlink data from the first network entity on a second frequency resource adjacent to the FDD downlink frequency band in the TDD frequency band. Corresponding to the method shown in fig. 1, in this embodiment, both the downlink time unit and the uplink time unit corresponding to the second frequency resource in the TDD system may be sent to the second network entity as the downlink data transmission time unit, that is, the time unit from the first network entity to the second network entity), or only the downlink time unit corresponding to the second frequency resource in the original TDD system may be used as the downlink data transmission time unit, and the uplink time unit of the second frequency resource may be used as the reserved unit, and so on.
The sending unit 402 is configured to send uplink data on a first frequency resource adjacent to an FDD uplink frequency band in a TDD frequency band. Corresponding to the method shown in fig. 1, the sending unit 402 may send uplink data on the first frequency resource according to the resource scheduling information from the first network entity. In this embodiment, the uplink time unit and the downlink time unit corresponding to the first frequency resource in the original TDD system may be used as the uplink data transmission time unit, that is, the time unit from the second network entity to the first network entity, or only the uplink time unit corresponding to the first frequency resource in the original TDD system may be used as the uplink data transmission time unit, and the downlink time unit corresponding to the first frequency resource is used as the reserved unit, and so on.
In this embodiment, the second network entity may be a wireless relay or a user equipment.
In some current applications, for the coexistence of the FDD system and the TDD system, a guard band is reserved between frequency bands of the TDD system and the FDD system during spectrum resource planning, and the guard band is used for suppressing adjacent channel interference between the TDD system and the FDD system. In the embodiment of the invention, the interference between adjacent frequencies can be effectively reduced under the condition that no guard band exists between the FDD system and the TDD system. And for the case that a guard band exists between the FDD system and the TDD system, the interference between adjacent frequencies can be further reduced. In the embodiment of the invention, the base station in the TDD system divides a part of the frequency band in the system into the uplink and the downlink which are specially used for the TDD system, and the division of the part of the frequency band can be flexibly adjusted according to the actual situation; and the part of the flexibly adjusted guard band is fully utilized under the condition of meeting the adjacent channel interference.
The technical scheme of the invention can be applied to LTE systems, and can also be applied to mobile communication systems such as 2G, 3G, 4G and the like.
In the following, taking the case that the first network entity is the base station and the second network entity is the wireless relay as an example, the system performance of the scheme in the embodiment of the present invention and the scheme without adjacent channel suppression in the prior art are simulated and compared.
The simulation parameters are as follows: the TDD system and the FDD system both comprise 19 cells and 57 sectors, and the wireless relay is positioned at a position 1.5R away from the base station, wherein R is the cell radius; the center frequency of the carrier frequency is 2.6G; the bandwidth is 10 MHz; the distance (ISD) between two adjacent base stations in the same system is 750 m; the height of the antenna of the wireless relay is 5 m; each macro cell includes 5 wireless relays.
Under the simulation parameters, fig. 5 shows a schematic diagram of frequency allocation adjacent to an FDD uplink frequency band in a TDD frequency band based on the technical scheme of the present invention and based on a conventional technical scheme when a TDD system and an FDD system coexist; wherein, the left ellipse is a schematic diagram of frequency allocation adjacent to an FDD uplink frequency band in a TDD frequency band based on the technical scheme of the invention; in the right ellipse is a schematic diagram of frequency allocation adjacent to an FDD uplink frequency band in a TDD frequency band based on a conventional technical scheme. It can be seen that, in the conventional technical solution, there exists a case where frequencies adjacent to an FDD uplink frequency band in a TDD frequency band are allocated to a downlink from a base station to a wireless relay and a downlink from the base station to a user equipment, that is, there exists interference of FDD downlink to TDD uplink; in the technical solution of the present application, a frequency adjacent to an FDD uplink frequency band in a TDD frequency band is allocated to an uplink of a wireless relay to a base station. Fig. 6 is a simulation diagram comparing system performance based on the frequency allocation shown in fig. 5. It can be seen that, after the technical scheme of the application is adopted, the capacity loss ratio (TPL) caused by the adjacent channel interference is greatly reduced.
Similarly, fig. 7 shows a schematic diagram of frequency allocation adjacent to an FDD downlink frequency band in a TDD frequency band based on the technical solution of the present invention and based on a conventional technical solution when a TDD system and an FDD system coexist; wherein, the left ellipse is a schematic diagram of frequency allocation adjacent to the FDD downlink frequency band in the TDD frequency band based on the technical scheme of the invention; in the right ellipse is a schematic diagram of frequency allocation adjacent to the FDD downlink frequency band in the TDD frequency band based on the conventional technical scheme. It can be seen that, in the conventional technical solution, there are cases where frequencies adjacent to the FDD downlink frequency band in the TDD frequency band are allocated to the uplink from the wireless relay to the base station and the uplink from the user equipment to the base station, that is, there is interference of the TDD downlink to the FDD uplink; in the technical scheme of the application, the frequency adjacent to the FDD downlink frequency band in the TDD frequency band is allocated to the downlink from the base station to the wireless relay. Fig. 8 is a simulation diagram comparing system performance based on the frequency allocation situation shown in fig. 7. It can be seen that, after the technical scheme of the application is adopted, the capacity loss ratio (TPL) caused by the adjacent channel interference is greatly reduced.
Through the above description of the embodiments, those skilled in the art can clearly understand that the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly, the embodiments can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solution of the present invention can be wholly or partially embodied in the form of a software product, which is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute the method described in the foregoing embodiments.
Those skilled in the art will appreciate that the modules in the devices in the above examples can be distributed in the devices according to the description of the embodiments, and can be correspondingly changed in one or more devices different from the embodiments. The modules of the above embodiments may be combined into one module, or further split into multiple sub-modules.
Based on the technical solutions provided in the foregoing embodiments, a machine-readable storage medium storing instructions for causing a machine to perform a frequency allocation method under multi-system adjacent frequency coexistence as described herein is also provided. Specifically, a system or an apparatus equipped with a storage medium on which software program codes that realize the functions of any of the above-described embodiments are stored may be provided, and a computer (or a CPU or MPU) of the system or the apparatus is caused to read out and execute the program codes stored in the storage medium.
In this case, the program code itself read from the storage medium may implement the functions of any of the above examples, and thus the program code and the storage medium storing the program code constitute a part of implementing the above-described mapping management solution.
Examples of the storage medium for supplying the program code include a floppy disk, a hard disk, a magneto-optical disk, an optical disk (e.g., CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD + RW), a magnetic tape, a nonvolatile memory card, and a ROM. Alternatively, the program code may be downloaded from a server computer via a communications network.
Further, it should be clear that the functions in the above-described embodiments may be implemented not only by executing the program code read out by the computer, but also by causing an operating system or the like operating on the computer to perform a part or all of the actual operations based on instructions of the program code, thereby.
Further, it is understood that the program code read out from the storage medium is written to a memory provided in an expansion board inserted into the computer or to a memory provided in an expansion unit connected to the computer, and then causes a CPU or the like mounted on the expansion board or the expansion unit to perform part or all of the actual operations based on instructions of the program code, thereby realizing the functions of any of the above examples.
The above-mentioned embodiments are intended to illustrate the objects, aspects and advantages of the present invention, and it should be understood that the above-mentioned embodiments are merely preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A method for allocating frequencies under coexistence of adjacent frequencies, comprising:
a first network entity in a Time Division Duplex (TDD) system allocates a first frequency resource adjacent to a Frequency Division Duplex (FDD) uplink frequency band in a TDD frequency band to a second network entity as an uplink transmission resource;
the first network entity receives uplink data sent by the second network entity on the first frequency resource;
and the first network entity takes a second frequency resource adjacent to an FDD downlink frequency band in a TDD frequency band as a downlink transmission resource and sends downlink data to the second network entity on the second frequency resource.
2. The method of claim 1, further comprising: the first network entity indicates the allocation information of the first frequency resource to the second network entity through resource scheduling information;
the receiving, by the first network entity, the uplink data sent by the second network entity on the first frequency resource is: and the first network entity receives the uplink data sent by the second network entity on the first frequency resource according to the resource scheduling information.
3. The method according to claim 1 or 2, wherein the first network entity is a base station and the second network entity is a user equipment; or,
the first network entity is a base station, and the second network entity is a wireless relay; or,
the first network entity is a wireless relay, and the second network entity is user equipment.
4. A first network entity, comprising:
a resource scheduling unit, configured to allocate a first frequency resource adjacent to an FDD uplink frequency band in a TDD frequency band to a second network entity as an uplink transmission resource;
a receiving unit, configured to receive uplink data sent by a second network entity on the first frequency resource;
and the sending unit is used for taking a second frequency resource adjacent to the FDD downlink frequency band in the TDD frequency band as a downlink transmission resource and sending downlink data to the second network entity on the second frequency resource.
5. The first network entity of claim 4, wherein the sending unit is further configured to indicate the first frequency resource allocated by the resource scheduling unit to the second network entity through the resource scheduling information.
6. The first network entity of claim 4 or 5, wherein the first network entity is a base station or a wireless relay.
7. A second network entity, comprising:
a receiving unit, configured to receive downlink data from a first network entity on a second frequency resource adjacent to an FDD downlink frequency band in a TDD frequency band;
a sending unit, configured to send uplink data on a first frequency resource adjacent to an FDD uplink frequency band in a TDD frequency band.
8. The second network entity of claim 7, wherein the sending unit sends the uplink data on the first frequency resource adjacent to the FDD uplink frequency band in the TDD frequency band according to the resource scheduling information from the first network entity.
9. The second network entity according to claim 7 or 8, wherein the second network entity is a wireless relay or a user equipment.
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| CN201210311040.9A CN103634804A (en) | 2012-08-28 | 2012-08-28 | Frequency assignment method under adjacent frequency coexistence and network entity |
| JP2013172868A JP2014045482A (en) | 2012-08-28 | 2013-08-23 | Frequency allocation method coexisted with adjacent channel, and network entity |
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| CN104284432A (en) * | 2014-09-29 | 2015-01-14 | 中国联合网络通信集团有限公司 | Method and device for utilizing asymmetrical frequency band resource |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105682240A (en) * | 2014-11-21 | 2016-06-15 | 工业和信息化部电信研究院 | Scheduling method and device for terminal equipment |
| CN105682240B (en) * | 2014-11-21 | 2019-03-12 | 工业和信息化部电信研究院 | A kind of terminal device dispatching method and device |
| CN108293258A (en) * | 2015-12-02 | 2018-07-17 | 高通股份有限公司 | System and method for mixing interference management |
| CN108293258B (en) * | 2015-12-02 | 2021-04-30 | 高通股份有限公司 | System and method for hybrid interference management |
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| JP2014045482A (en) | 2014-03-13 |
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