CN106535244B - Wireless communication method and device - Google Patents
Wireless communication method and device Download PDFInfo
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- CN106535244B CN106535244B CN201510578285.1A CN201510578285A CN106535244B CN 106535244 B CN106535244 B CN 106535244B CN 201510578285 A CN201510578285 A CN 201510578285A CN 106535244 B CN106535244 B CN 106535244B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
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- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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Abstract
A wireless communication method and apparatus, in particular to a method and apparatus for determining channel availability of an unlicensed carrier in a base station of an LTE communication system, comprising: the base station determines a value of a first parameter, wherein the first parameter is related to the average interference power of the unlicensed carrier; the base station determines a value of a second parameter, wherein the second parameter is related to an occupied/idle ratio of the unlicensed carrier; and the base station determines the channel availability of the unlicensed carrier according to the first parameter and the second parameter.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to the field of wireless communications technologies.
Background
In the field of wireless communication, generally, a traditional deployment method is that a system operates in a licensed band (licenedband), that is, the whole spectrum resource is reserved for the system to use. Typically, LTE communication systems operate using licensed frequency bands.
However, as wireless services further increase, the capacity and frequency band requirements for wireless communication systems also increase. In this case, the licensed band resource of the LTE system is relatively insufficient. Therefore, one of the recent research hotspots in the LTE field is how to utilize the resources of the unlicensed frequency band to offload the high-speed data traffic. This scheme is called as an LTE (Long term evolution) in Unlicensed spectrum (LTE-U) system
For example, in a typical scenario, the LTE system uses the frequency bands of the WiFi system. I.e. the situation where cells of the LTE system and cells of the WiFi system at least partly co-exist in geographical location. In this case, if the LTE system can use the WiFi frequency band to perform traffic offloading at some high-load moments, it is obvious that the performance of the system can be greatly improved, thereby effectively coping with high-load application scenarios.
Obviously, under the coexistence of LTE and WiFi systems, it is the most direct choice to utilize the authorized carrier of LTE system to assist the Access of the unlicensed carrier of WiFi system, so that the Licensed-Assisted Access (LAA) has become a hot spot in the mobile communication field recently.
By utilizing the LAA technology, the existing flow of the LTE system can be furthest used for realizing Carrier Aggregation (CA) scheduling of authorized carriers and unauthorized carriers. However, in order to be compatible with the unlicensed carrier system, some new mechanisms need to be introduced, and one of the first problems is how to perform carrier selection in the LTE-LAA system.
Generally, we determine channel availability (channel availability) of each carrier by measurement, and select carriers according to the channel availability. In LTE systems, the determination of channel availability is determined by energy detection, i.e. measuring the average interference power of the individual carriers over a period of time. However, the existing carrier selection method only considering the average interference power is not suitable any more due to the characteristics of the unlicensed carriers.
First, the unlicensed carrier has a different interference pattern than the licensed carrier. Since the unlicensed carrier may be shared by multiple communication systems, there may be a situation where, during a period of time when a certain LTE system performs energy detection, the unlicensed carrier is just used by other communication systems, and since normal communication traffic transmission is performed on the unlicensed carrier, the transmission power may be relatively large, and this part of the transmission power may be completely recognized as interference power by the LTE system, so that a higher average interference power measurement result may be obtained; however, it may be the case that traffic on the unlicensed carrier ceases for only a short period of time, the carrier is already idle and available, but the LTE system will not select the carrier due to the high instantaneous power effect, resulting in an increase in the measured average power.
Another situation is that the measured average interference power is lower than a threshold, the LTE system selects the carrier, but in the actual situation, a certain amount of interference exists in most of the time or in most of the subframes, that is, in most of the situations, the carrier is already occupied by other systems, but the average interference power is still lower than the threshold due to the low transmission power of the service, so that the LTE system selects the carrier incorrectly, and the actual carrier is busy.
Therefore, the invention aims to find a new carrier selection method; this approach needs to enable accurate determination of channel availability of unlicensed carriers in the case of LTE-LAA; but also to be compatible with existing specifications as much as possible.
Disclosure of Invention
To solve the above problems in the prior art, the present invention provides a new method for determining the availability of an unlicensed carrier channel. The occupation/idle ratio of the carrier and the average interference power are combined, so that the base station can determine the real carrier occupation situation according to the actual situation.
Specifically, according to a first aspect of the present invention, a method for determining channel availability of an unlicensed carrier in a base station of an LTE communication system is provided, including: the base station determines a value of a first parameter, wherein the first parameter is related to the average interference power of the unlicensed carrier; the base station determines a value of a second parameter, wherein the second parameter is related to an occupied/idle ratio of the unlicensed carrier; and the base station determines the channel availability of the unlicensed carrier according to the first parameter and the second parameter.
Preferably, the first parameter is a signal to interference plus noise ratio of the unlicensed carrier at a user equipment of the LTE communication system.
More preferably, the first step further includes that the base station instructs a first number of user equipments in the LTE communication system to perform reference signal received power measurement on a licensed carrier of the base station; the base station receives the reference signal received power measurement results sent by the first number of user equipment; the base station determines the reference signal received power of the unlicensed carrier at the first number of user equipment according to the reference signal received power measurement result and the transmission power of the reference signal; the base station measures the average interference power of the unlicensed carrier; and the base station determines the signal-to-interference-and-noise ratio of the unauthorized carrier at the user equipment according to the reference signal received power of the unauthorized carrier and the average interference power of the unauthorized carrier.
More preferably, the base station further determines the reference signal received power of the unlicensed carrier at the first number of user equipments according to the reference signal received power measurement result, the transmission power of the reference signal, and a path loss offset between the licensed carrier and the unlicensed carrier.
More preferably, the second step further comprises the base station measuring the occupied/idle ratio of the unlicensed carrier.
More preferably, the third step further comprises determining the channel availability of the unlicensed carrier according to the following formula:
wherein Γ represents the channel availability of the unlicensed carrier, M represents the first number, B represents the bandwidth of the unlicensed carrier, and SINRmRepresents a signal to interference plus noise ratio of the unlicensed carrier at the user equipment, and r represents a ratio of occupied/idle of the unlicensed carrier.
More preferably, the first step further includes that the base station instructs a first number of user equipments in the LTE communication system to perform reference signal received power measurement on a licensed carrier of the base station; the base station sends path loss offset between the authorized carrier and the unauthorized carrier to the first number of user equipment and instructs the first number of user equipment to determine reference signal receiving power of the unauthorized carrier at the first number of user equipment according to the path loss offset and the reference signal receiving power measurement result; the base station instructs the first number of user equipment to measure the average interference power of the unlicensed carrier; the base station instructs the first number of user equipment to determine the signal-to-interference-and-noise ratio of the unlicensed carrier at the user equipment according to the reference signal received power of the unlicensed carrier and the average interference power of the unlicensed carrier; and the base station receives the signal-to-interference-and-noise ratios of the unlicensed carriers at the user equipment, which are sent by the first number of user equipments.
More preferably, in the second step, the base station instructs the first number of user equipments to measure the occupied/idle ratio of the unlicensed carrier at the user equipment; the base station receives the occupation/idle ratio of the unlicensed carrier at the user equipment, which is sent by the first number of user equipments.
More preferably, the third step further comprises determining the channel availability of the unlicensed carrier according to the following formula:
wherein Γ represents the channel availability of the unlicensed carrier, M represents the first number, B represents the bandwidth of the unlicensed carrier, and SINRmSignal to interference plus noise ratio, r, at the user equipment on behalf of the unlicensed carriermRepresents a ratio of occupied/idle at the user equipment of the unlicensed carrier.
According to a second aspect of the present invention, a method for carrier selection in a base station of an LTE communication system is provided, where the carrier is an unlicensed carrier, and the method includes: the carrier selection is performed based on the channel availability of the unlicensed carrier determined by the method according to the first aspect of the invention.
According to a third aspect of the present invention, an apparatus for determining channel availability of an unlicensed carrier in a base station of an LTE communication system is provided, including: a first determining module, configured to determine, by the base station, a value of a first parameter, where the first parameter is related to an average interference power of the unlicensed carrier; a second determining module, configured to determine, by the base station, a value of a second parameter, where the second parameter is related to an occupied/idle ratio of the unlicensed carrier; a third determining module, configured to determine, by the base station, the channel availability of the unlicensed carrier according to the first parameter and the second parameter.
Preferably, in the first determining module, the method further comprises: an indicating unit, configured to instruct, by the base station, a first number of user equipments in the LTE communication system to perform reference signal received power measurement on a licensed carrier of the base station; a receiving unit, configured to receive, by the base station, the reference signal received power measurement result sent by the first number of user equipments; a first determining unit, configured to determine, by the base station, reference signal received powers of the unlicensed carriers at the first number of user equipments according to the reference signal received power measurement result and the transmission power of the reference signal; a first measurement unit, configured to measure, by the base station, an average interference power of the unlicensed carrier; a second determining unit, configured to determine, by the base station, a signal-to-interference-and-noise ratio of the unlicensed carrier at the ue according to a reference signal received power of the unlicensed carrier and an average interference power of the unlicensed carrier; in the second determining module, the method further comprises: a second measurement unit, configured to measure, by the base station, an occupied/idle ratio of the unlicensed carrier.
Preferably, in the first determining module, the method further comprises: a first indicating unit, configured to instruct, by the base station, a first number of user equipments in the LTE communication system to perform reference signal received power measurement on a licensed carrier of the base station; a second indicating unit, configured to send, by the base station to the first number of user equipments, a path loss offset between the licensed carrier and the unlicensed carrier and instruct the first number of user equipments to determine, according to the path loss offset and the reference signal received power measurement result, reference signal received powers of the unlicensed carrier at the first number of user equipments; a third indicating unit, configured to instruct, by the base station, the first number of user equipments to measure the average interference power of the unlicensed carrier; a fourth indicating unit, configured to instruct, by the base station, the first number of user equipments to determine, according to the reference signal received power of the unlicensed carrier and the average interference power of the unlicensed carrier, the signal-to-interference-and-noise ratio of the unlicensed carrier at the user equipment; a first receiving unit, configured to receive, by the base station, a signal-to-interference-and-noise ratio, at the user equipment, of the unlicensed carrier sent by the first number of user equipments; in the second determining module, the method further comprises: a fifth indicating unit, configured to instruct, by the base station, the first number of user equipments to measure an occupied/idle ratio of the unlicensed carrier at the user equipment; a second receiving unit, configured to receive, by the base station, an occupied/idle ratio of the unlicensed carrier at the user equipment, where the unlicensed carrier is sent by the first number of user equipments.
According to a fourth aspect of the present invention, an apparatus for assisting in determining channel availability of an unlicensed carrier in a user equipment of an LTE communication system is provided, including: a first measurement module, configured to measure, by the ue, an average interference power of the unlicensed carrier; a second measurement module, configured to measure, by the ue, an occupied/idle ratio of the unlicensed carrier.
In the invention, the occupation/vacancy of the unauthorized carrier is added into the calculation of the channel availability, so that the occupation condition of the unauthorized carrier can be accurately reflected, and the requirement of being compatible with the prior technical specification is met by a method of indirectly obtaining the unauthorized carrier result by using the measurement result of the authorized carrier, thereby realizing the aim of the invention.
Drawings
Other features, objects and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments thereof, which proceeds with reference to the accompanying drawings.
Fig. 1 shows a flow chart of a method of determining unlicensed carrier channel availability in a base station of an LTE communication system according to the present invention;
fig. 2 shows a block diagram of an apparatus for determining the availability of an unlicensed carrier channel in a base station of an LTE communication system according to the present invention;
fig. 3 shows a block diagram of an apparatus for assisting in determining unlicensed carrier channel availability in a user equipment of an LTE communication system according to the present invention.
Wherein the same or similar reference numerals indicate the same or similar step features or means/modules.
Detailed Description
In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings which form a part hereof. The accompanying drawings illustrate, by way of example, specific embodiments in which the invention may be practiced. The illustrated embodiments are not intended to be exhaustive of all embodiments according to the invention. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims.
First, according to the application scenario of the present invention, there is an area covered by the LTE communication system, which includes at least one base station and a UE. In addition, other unlicensed carriers exist in the area, which may also be used by other LTE or WiFi communication systems.
When the base station needs to select a certain unlicensed carrier, the channel availability of each unlicensed carrier needs to be determined first. Compared with the method that the authorized carrier determines the channel availability by measuring the average interference power, the invention provides that at least two parameters are considered for the unauthorized carrier to accurately determine the channel availability, wherein the first parameter is related to the average interference power of the unauthorized carrier, and the second parameter is related to the occupation/idle ratio of the unauthorized carrier. After the two parameters are determined, the base station can accurately obtain the channel availability of the unlicensed carrier, thereby achieving the aim of the invention.
The present invention is based on the above solution, and further proposes that the first parameter can be represented by the signal to interference plus noise ratio of the unlicensed carrier at the ue, because a value of the average interference power is introduced into the calculation of the signal to interference plus noise ratio.
On this basis, according to one embodiment of the invention, a method for determining the availability of an unlicensed carrier channel is proposed.
Firstly, a base station selects a certain number of user equipment, such as a first number M of user equipment, for assisting in determining the channel availability, and then instructs the user equipment to perform Reference Signal Receiving Power (Reference Signal Receiving Power, RSRP) measurement on authorized carriers of the base station;
secondly, the base station receives RSRP measurement results on the authorized carriers sent by the user equipment after the user equipment completes measurement;
thirdly, the base station determines the reference signal received power of the unauthorized carrier at the user equipment, such as RSRP, according to the received RSRP measurement result and the reference signal transmitting powermRepresenting the reference signal received power at the mth user equipment. In particular, the base station may further determine RSRP based on a path loss offset between the licensed and unlicensed carriersm；
Next, the base station measures the average interference power of the unlicensed carrier
Specifically, the base station may perform measurement within a predetermined measurement window; it is also possible to perform measurements over a plurality of measurement windows within a certain predetermined measurement period and obtain them in an iterative manner
For example, the final result can be obtained by an Exponential Weighted Moving Average (EWMA), i.e., the result of each measurement and the last result are fitted with different weights. The measurement period, the measurement window and the weighting parameters can be flexibly configured by the base station according to specific conditions;
next, the SINR of the unlicensed carrier at the ue m is determined by the following formulam：
To this end, the base station determines a first parameter SINRm。
In the following, how to determine the second parameter is discussed, for example, the base station may measure the occupied/idle ratio of the unlicensed carrier, and specifically, the base station may measure the interference power of the unlicensed carrier on each subframe within the measurement window, and count that the subframe is occupied when the measured interference power is greater than a predetermined value, and count that the subframe is idle otherwise, so as to obtain the occupied/idle ratio r, i.e., the second parameter.
Finally, the channel availability of the unlicensed carrier is determined by the first parameter and the second parameter, for example, according to the following formula:
where Γ represents channel availability of the unlicensed carrier and B represents bandwidth of the unlicensed carrier.
Yet according to another embodiment of the invention, the determining of the first parameter and the second parameter may be assisted by the user equipment.
Specifically, in the first step, the base station still instructs M user equipments to perform RSRP measurement on the authorized carrier of the base station;
secondly, the base station sends path loss offset between the unauthorized carrier and the authorized carrier to the user equipment and instructs the user equipment to determine RSRP according to the offset and the RSRP measurement resultm；
Thirdly, the base station instructs the user equipment to measure the average interference power of the unlicensed carrier
Fourthly, the base station instructs the user equipment to perform the RSRPmAnd determining the SINR of the unlicensed carrierm：
To this end, a first parameter SINR is determinedm；
Then the base station receives a first parameter SINR respectively sent by M user equipmentm。
Regarding the second parameter, the base station instructs the ue to measure the occupied/idle ratio r of the unlicensed carrier at each ue in the manner described abovemThen receiving second parameters r respectively sent by M user equipmentsm。
Finally, the channel availability of the unlicensed carrier is determined by the first parameter and the second parameter, for example, according to the following formula:
where Γ represents channel availability of the unlicensed carrier and B represents bandwidth of the unlicensed carrier.
According to another embodiment of the present invention, after determining the channel availability Γ of each unlicensed carrier by the various methods described above, the base station may perform carrier selection according to Γ, thereby ensuring that the most suitable unlicensed carrier can be selected.
Fig. 1 shows a flow chart for determining the availability of an unlicensed carrier channel according to the above-described embodiment, including:
s11, the base station determines a value of a first parameter, wherein the first parameter is related to the average interference power of the unlicensed carrier;
s12, the base station determines the value of a second parameter, wherein the second parameter is related to the occupation/idle ratio of the unauthorized carrier;
s13, the base station determines the channel availability of the unauthorized carrier according to the first parameter and the second parameter.
The following describes the apparatus corresponding to the above method provided by the present invention with reference to the drawings, and the unit/device features thereof are corresponding to the step features in the above method, which will be simplified.
Fig. 2 shows an apparatus 20 for determining channel availability of an unlicensed carrier in a base station of an LTE communication system according to the present invention, the apparatus comprising:
a first determining module 2001, configured to determine, by the base station, a value of a first parameter, where the first parameter relates to an average interference power of the unlicensed carrier;
a second determining module 2002, configured to determine, by the base station, a value of a second parameter, where the second parameter is related to an occupied/idle ratio of the unlicensed carrier;
a third determining module 2003, configured to determine, by the base station, the channel availability of the unlicensed carrier according to the first parameter and the second parameter.
According to an embodiment of the present invention, in the first determining module 2001, further includes:
an indicating unit, configured to instruct, by the base station, a first number of user equipments in the LTE communication system to perform reference signal received power measurement on a licensed carrier of the base station;
a receiving unit, configured to receive, by the base station, the reference signal received power measurement result sent by the first number of user equipments;
a first determining unit, configured to determine, by the base station, reference signal received powers of the unlicensed carriers at the first number of user equipments according to the reference signal received power measurement result and the transmission power of the reference signal;
a first measurement unit, configured to measure, by the base station, an average interference power of the unlicensed carrier;
a second determining unit, configured to determine, by the base station, a signal-to-interference-and-noise ratio of the unlicensed carrier at the ue according to a reference signal received power of the unlicensed carrier and an average interference power of the unlicensed carrier;
in the second determining module 2002, the method further includes:
a second measurement unit, configured to measure, by the base station, an occupied/idle ratio of the unlicensed carrier.
According to another embodiment of the present invention, in the first determining module 2001, further includes:
a first indicating unit, configured to instruct, by the base station, a first number of user equipments in the LTE communication system to perform reference signal received power measurement on a licensed carrier of the base station;
a second indicating unit, configured to send, by the base station to the first number of user equipments, a path loss offset between the licensed carrier and the unlicensed carrier and instruct the first number of user equipments to determine, according to the path loss offset and the reference signal received power measurement result, reference signal received powers of the unlicensed carrier at the first number of user equipments;
a third indicating unit, configured to instruct, by the base station, the first number of user equipments to measure the average interference power of the unlicensed carrier;
a fourth indicating unit, configured to instruct, by the base station, the first number of user equipments to determine, according to the reference signal received power of the unlicensed carrier and the average interference power of the unlicensed carrier, the signal-to-interference-and-noise ratio of the unlicensed carrier at the user equipment;
a first receiving unit, configured to receive, by the base station, a signal-to-interference-and-noise ratio, at the user equipment, of the unlicensed carrier sent by the first number of user equipments;
in the second determining module 2002, the method further includes:
a fifth indicating unit, configured to instruct, by the base station, the first number of user equipments to measure an occupied/idle ratio of the unlicensed carrier at the user equipment;
a second receiving unit, configured to receive, by the base station, an occupied/idle ratio of the unlicensed carrier at the user equipment, where the unlicensed carrier is sent by the first number of user equipments.
Fig. 3 shows an apparatus 30 for assisting in determining channel availability of an unlicensed carrier in a user equipment of an LTE communication system, the apparatus comprising:
a first measurement module 3001, configured to measure, by the ue, an average interference power of the unlicensed carrier;
a second measuring module 3002, configured to measure, by the ue, an occupied/idle ratio of the unlicensed carrier.
While embodiments of the present invention have been described above, the present invention is not limited to a particular system, device, and protocol, and various modifications and changes may be made by those skilled in the art within the scope of the appended claims.
Other variations to the disclosed embodiments can be understood and effected by those skilled in the art from a study of the specification, the disclosure, the drawings, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. In the present invention, "first" and "second" merely indicate names and do not represent order relationships. In practical applications of the invention, one element may perform the functions of several technical features recited in the claims. Any reference signs in the claims shall not be construed as limiting the scope.
Claims (13)
1. A method of determining channel availability of an unlicensed carrier in a base station of an LTE communication system, comprising:
a. the base station determines a value of a first parameter, wherein the first parameter is related to an average interference power of the unlicensed carrier, and the value of the first parameter is determined based on reference signal received powers measured by a first number of user equipment in the LTE communication system on licensed carriers of the base station;
b. the base station determines a value of a second parameter, wherein the second parameter is related to an occupied/idle ratio of the unlicensed carrier;
c. and the base station determines the channel availability of the unlicensed carrier according to the first parameter and the second parameter.
2. The method of claim 1, wherein the first parameter is a signal to interference and noise ratio of the unlicensed carrier at a user equipment of the LTE communication system.
3. The method of claim 2, wherein the step a comprises:
instructing, by the base station, a first number of user equipments in the LTE communication system to perform reference signal received power measurements on a licensed carrier of the base station;
a2. the base station receives the reference signal received power measurement results sent by the first number of user equipment;
a3. the base station determines the reference signal received power of the unlicensed carrier at the first number of user equipment according to the reference signal received power measurement result and the transmission power of the reference signal;
a4. the base station measures the average interference power of the unlicensed carrier;
a5. and the base station determines the signal-to-interference-and-noise ratio of the unauthorized carrier at the user equipment according to the reference signal received power of the unauthorized carrier and the average interference power of the unauthorized carrier.
4. The method of claim 3, wherein the step a3 includes:
and the base station determines the reference signal received power of the unauthorized carrier at the first number of user equipment according to the reference signal received power measurement result, the transmission power of the reference signal and the path loss offset between the authorized carrier and the unauthorized carrier.
5. The method of claim 3, wherein step b further comprises the base station measuring an occupied/idle ratio of the unlicensed carrier.
6. The method of claim 5, wherein the step c comprises determining the channel availability of the unlicensed carrier according to the formula:
wherein Γ represents the channel availability of the unlicensed carrier, m represents the first number, B represents the bandwidth of the unlicensed carrier, SINRMRepresents a signal to interference plus noise ratio of the unlicensed carrier at the user equipment, and r represents a ratio of occupied/idle of the unlicensed carrier.
7. The method of claim 2, wherein the step a comprises:
al' instructing, by the base station, a first number of user equipments in the LTE communication system to make reference signal received power measurements on a licensed carrier of the base station;
a 2'. the base station sends path loss offset between the authorized carrier and the unlicensed carrier to the first number of user equipments and instructs the first number of user equipments to determine reference signal received power of the unlicensed carrier at the first number of user equipments according to the path loss offset and the reference signal received power measurement result;
a 3'. the base station instructs the first number of user equipments to measure the average interference power of the unlicensed carrier;
a 4'. the base station instructs the first number of user equipments to determine the signal-to-interference-and-noise ratio of the unlicensed carrier at the user equipment according to the reference signal received power of the unlicensed carrier and the average interference power of the unlicensed carrier;
a 5' the base station receives the signal-to-interference-and-noise ratio of the unlicensed carrier at the user equipment, which is sent by the first number of user equipments.
8. The method of claim 7, wherein step b further comprises,
the base station instructing the first number of user equipments to measure an occupied/idle ratio of the unlicensed carrier at the user equipment;
b 2' the base station receives the occupation/idle ratio of the unlicensed carrier at the user equipment sent by the first number of user equipments.
9. The method of claim 8, wherein the step c comprises determining the channel availability of the unlicensed carrier according to the formula:
wherein Γ represents the channel availability of the unlicensed carrier, m represents the first number, B represents the bandwidth of the unlicensed carrier, SINRMSignal to interference plus noise ratio, r, at the user equipment on behalf of the unlicensed carriermRepresents a ratio of occupied/idle at the user equipment of the unlicensed carrier.
10. A method for carrier selection in a base station of an LTE communication system, wherein the carrier is an unlicensed carrier, the method comprising: the carrier selection is made according to the channel availability of the unlicensed carrier determined according to the method of any of claims 1-9.
11. An apparatus for determining channel availability of an unlicensed carrier in a base station of an LTE communication system, comprising:
a first determining module, configured to determine a value of a first parameter by the base station, wherein the first parameter relates to an average interference power of the unlicensed carrier, and the value of the first parameter is determined based on reference signal received powers measured by a first number of user equipments in the LTE communication system on a licensed carrier of the base station;
a second determining module, configured to determine, by the base station, a value of a second parameter, where the second parameter is related to an occupied/idle ratio of the unlicensed carrier;
a third determining module, configured to determine, by the base station, the channel availability of the unlicensed carrier according to the first parameter and the second parameter.
12. The apparatus of claim 11, wherein,
in the first determining module, the method further comprises:
an indicating unit, configured to instruct, by the base station, a first number of user equipments in the LTE communication system to perform reference signal received power measurement on a licensed carrier of the base station;
a receiving unit, configured to receive, by the base station, the reference signal received power measurement result sent by the first number of user equipments;
a first determining unit, configured to determine, by the base station, reference signal received powers of the unlicensed carriers at the first number of user equipments according to the reference signal received power measurement result and the transmission power of the reference signal;
a first measurement unit, configured to measure, by the base station, an average interference power of the unlicensed carrier;
a second determining unit, configured to determine, by the base station, a signal-to-interference-and-noise ratio of the unlicensed carrier at the ue according to a reference signal received power of the unlicensed carrier and an average interference power of the unlicensed carrier;
in the second determining module, the method further comprises:
a second measurement unit, configured to measure, by the base station, an occupied/idle ratio of the unlicensed carrier.
13. The apparatus of claim 11, wherein,
in the first determining module, the method further comprises:
a first indicating unit, configured to instruct, by the base station, a first number of user equipments in the LTE communication system to perform reference signal received power measurement on a licensed carrier of the base station;
a second indicating unit, configured to send, by the base station to the first number of user equipments, a path loss offset between the licensed carrier and the unlicensed carrier and instruct the first number of user equipments to determine, according to the path loss offset and the reference signal received power measurement result, reference signal received powers of the unlicensed carrier at the first number of user equipments;
a third indicating unit, configured to instruct, by the base station, the first number of user equipments to measure the average interference power of the unlicensed carrier;
a fourth indicating unit, configured to instruct, by the base station, the first number of user equipments to determine, according to the reference signal received power of the unlicensed carrier and the average interference power of the unlicensed carrier, the signal-to-interference-and-noise ratio of the unlicensed carrier at the user equipment;
a first receiving unit, configured to receive, by the base station, a signal-to-interference-and-noise ratio, at the user equipment, of the unlicensed carrier sent by the first number of user equipments;
in the second determining module, the method further comprises:
a fifth indicating unit, configured to instruct, by the base station, the first number of user equipments to measure an occupied/idle ratio of the unlicensed carrier at the user equipment;
a second receiving unit, configured to receive, by the base station, an occupied/idle ratio of the unlicensed carrier at the user equipment, where the unlicensed carrier is sent by the first number of user equipments.
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