CN106804041B - Wireless communication method and device - Google Patents
Wireless communication method and device Download PDFInfo
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- CN106804041B CN106804041B CN201510843267.1A CN201510843267A CN106804041B CN 106804041 B CN106804041 B CN 106804041B CN 201510843267 A CN201510843267 A CN 201510843267A CN 106804041 B CN106804041 B CN 106804041B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0473—Wireless resource allocation based on the type of the allocated resource the resource being transmission power
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
A wireless communication method and device, in particular to a method and device for allocating transmission power of unlicensed carriers in a base station of an LTE communication system, wherein the number of the unlicensed carriers is more than one, the method and device comprise: the base station determines a carrier needing to distribute transmitting power in the unauthorized carriers before the moment of sending the demodulation reference signal each time; and the base station carries out transmission power distribution on the carrier needing to be distributed with the transmission power at the moment of sending the demodulation reference signal each time.
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 (licensed band), that is, the entire spectrum resource is reserved for the system. 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.
The LAA technology can largely follow the existing technology of the LTE system, for example, Carrier Aggregation (CA) of unlicensed carriers is implemented. However, in order to be compatible with the unlicensed carrier system, some new mechanisms need to be introduced. For example, such as power allocation problem under multiple unlicensed carrier aggregation.
According to some existing specifications, such as those specified in the european communication specifications, there is a limit to the total transmit power in certain specific frequency ranges. As in the range 5150 MHz-5350 MHz, the overall transmit power is limited to below 23dBm (about 200mW), which means that in this frequency range the transmit power of the multiple carriers together cannot exceed this limit if the technique of multi-carrier aggregation is used. The transmit power must be allocated to these carriers in some way.
For the licensed carriers of the LTE system, dynamic transmission power allocation can be performed in the CA case as well, since all licensed carriers are shared by the system and can be scheduled arbitrarily. In the LAA system, the situation is quite different.
Considering the listen-before-talk (LBT) mechanism used in the LAA system, an LTE system must first perform a Clear Channel Assessment (CCA) operation on an unlicensed carrier before obtaining the right to use the unlicensed carrier, and determine whether a Channel is currently idle by measuring the current received power level of the Channel. Therefore, in the LAA system, the base station generally cannot schedule the unlicensed carriers in advance, and on the other hand, the CCA operation may occur at any time, that is, the base station may also obtain the right to use a certain unlicensed carrier at any time. This uncertainty causes power allocation to the unlicensed carriers to become more complex. Therefore, a method for performing static power allocation on the unlicensed carriers is proposed, that is, a certain transmission power (even allocation or non-even allocation) is allocated to all the unlicensed carriers in advance, regardless of whether a certain carrier is actually used. Obviously, this must result in a significant waste of transmit power. The requirement for flexible scheduling cannot be met.
Therefore, the object of the present invention is to find a new method for dynamically allocating the transmission power of an unlicensed carrier; this approach needs to enable dynamic allocation of reasonable transmit power for each unlicensed carrier in the case of LTE-LAA; it is also desirable to ensure that the existing specifications are compatible as far as possible without introducing excessive system complexity.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention provides a new method for dynamically allocating the transmission power of an unlicensed carrier. By determining the time point of power distribution at the transmission time point of a demodulation reference signal (De Modulation reference signal, DMRS for short), it is ensured that the transmission power can be distributed to all available unlicensed carriers at the same time.
Specifically, according to a first aspect of the present invention, a method for allocating transmission power to unlicensed carriers in a base station of an LTE communication system is provided, where the number of the unlicensed carriers is greater than one, the method including: the base station determines a carrier needing to distribute transmitting power in the unauthorized carriers before the moment of sending the demodulation reference signal each time; and the base station carries out transmission power distribution on the carrier needing to be distributed with the transmission power at the moment of sending the demodulation reference signal each time.
Preferably, wherein the first further comprises: if one carrier in the unlicensed carriers is used by the base station for sending data before the time when the base station sends the demodulation reference signal, the carrier is determined by the base station to be the carrier needing to be allocated with the transmission power; and if the base station carries out idle channel detection on one carrier in the unauthorized carriers before the time of sending the demodulation reference signal and determines that the carrier is idle, the carrier is determined as the carrier needing to be allocated with the transmitting power by the base station.
More preferably, further comprising: and when the base station determines that the carrier is idle, the base station does not transmit data on the carrier from the moment of finishing the idle channel detection until the next moment of transmitting the demodulation reference signal.
More preferably, further comprising: and the base station carries out idle channel detection on the carrier again before the next time of sending the demodulation reference signal, and if the carrier is determined to be idle, the carrier is determined to be the carrier needing to be allocated with the transmitting power by the base station.
Preferably, wherein the second step further comprises: and the base station allocates the transmitting power according to the total transmitting power on the unauthorized carrier and the number of the carriers needing to allocate the transmitting power.
More preferably, further comprising: and the base station distributes the transmitting power evenly according to the total transmitting power and the number of the carriers needing to distribute the transmitting power.
Preferably, the method further comprises the following steps: and the base station determines the time for sending the demodulation reference signal, and sends the time for sending the demodulation reference signal to the user equipment through an authorized carrier.
According to a second aspect of the present invention, a channel estimation method is provided, including: and performing channel estimation by using the power variable of the demodulation reference signal which is transmitted last time.
According to a third aspect of the present invention, an apparatus for allocating transmission power to unlicensed carriers in a base station of an LTE communication system is provided, where the number of the unlicensed carriers is greater than one, the apparatus comprising: a determining module, configured to determine, by the base station, a carrier to which transmission power needs to be allocated in the unlicensed carriers before a time when the base station sends a demodulation reference signal each time; and the allocation module is used for allocating the transmission power to the carrier needing to be allocated with the transmission power at the moment that the base station sends the demodulation reference signal each time.
Preferably, wherein the determining module is further configured to: if one carrier in the unlicensed carriers is used by the base station for sending data before the time when the base station sends the demodulation reference signal, the carrier is determined by the base station to be the carrier needing to be allocated with the transmission power; and if the base station carries out idle channel detection on one carrier in the unauthorized carriers before the time of sending the demodulation reference signal and determines that the carrier is idle, the carrier is determined as the carrier needing to be allocated with the transmitting power by the base station.
More preferably, further for: and when the base station determines that the carrier is idle, the base station does not transmit data on the carrier from the moment of finishing the idle channel detection until the next moment of transmitting the demodulation reference signal.
More preferably, further for: and the base station carries out idle channel detection on the carrier again before the next time of sending the demodulation reference signal, and if the carrier is determined to be idle, the carrier is determined to be the carrier needing to be allocated with the transmitting power by the base station.
Preferably, wherein the allocation module is further configured to: and the base station allocates the transmitting power according to the total transmitting power on the unauthorized carrier and the number of the carriers needing to allocate the transmitting power.
More preferably, further for: and the base station distributes the transmitting power evenly according to the total transmitting power and the number of the carriers needing to distribute the transmitting power.
Preferably, the method further comprises the following steps: a sending module, configured to determine, by the base station, the time for sending the demodulation reference signal, and send, by the base station, the time for sending the demodulation reference signal to the user equipment through an authorized carrier.
In the invention, the dynamic allocation of the transmitting power is ensured by allocating the power at the time of transmitting the DMRS each time; the accuracy of the CCA detection result is ensured by keeping channel silence and secondary CCA detection; the existing specification is compatible through an improved channel estimation mode; thus, the object of the present invention is achieved.
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 for transmission power allocation for unlicensed carriers in a base station of an LTE communication system according to the present invention;
fig. 2 shows a block diagram of an apparatus for allocating transmit power to unlicensed carriers in a base station 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.
Firstly, 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 at least one UE. In addition, there are a plurality of other unlicensed carriers in the area, wherein these unlicensed carriers may also be used by LTE or other wireless access communication systems of other operators, such as WiFi communication systems.
When a base station of the LTE communication system needs to use a plurality of unlicensed carriers to transmit data, firstly, transmission power needs to be allocated to the carriers, and considering that the base station may obtain the use weights of the carriers at different time, a time point for allocating the transmission power needs to be determined. That is, the base station determines which carriers need to be allocated with transmission power before the time of transmitting the DMRS signal each time, and then allocates transmission power to the carriers at the time of transmitting the DMRS signal. Thus, the object of the present invention is achieved.
According to the present invention, various methods can be used to determine those unlicensed carriers to which transmission power allocation is required, for example, all carriers can be determined as carriers to be allocated regardless of whether the base station has acquired the right to use the carriers. It is clear that such a determination is simple but results in a waste of transmit power.
On this basis, according to one embodiment of the present invention, it is proposed to determine the carriers of the following two cases as the carriers to which the transmission power needs to be allocated:
firstly those carriers that have been used by the base station to transmit data, i.e. the carriers that are being used at the moment the DMRS signal is currently transmitted;
and those carriers that have not been used for transmitting data at the time when the DMRS signal is currently transmitted but have been determined by the base station as being channel-clear in the previous CCA detection, that are available for use, that is, carriers that have been taken use of by the base station but have not yet started to be used.
Obviously, this preferred method reduces the waste of transmit power. Since only the carriers that can be used by the base station need to be allocated power.
As a preference, it is considered that for the second case described above, the time point of completing CCA detection may be between the times of transmitting DMRS signals twice, so that after the base station detects that a certain unlicensed carrier is idle through CCA operation, until the next time of transmitting DMRS signals, the base station keeps the carrier silent, that is, does not transmit any data on the carrier. Since the base station has not made a new transmission power allocation during this period of time, the carrier has not yet gained transmission power, and thus the base station will not transmit data on this carrier in order to avoid the overall transmission power exceeding the limit.
Further, it is contemplated that other systems may attempt to use the unlicensed carrier during periods when the carrier remains silent. Since the base station does not transmit data on the carrier, the CCA detection result of other systems may also consider the carrier to be idle and thus occupy it. Therefore, in order to ensure that the carrier is still idle, before the time of next transmitting the DMRS signal, the base station may perform CCA detection once, determine that the carrier is a carrier to which transmission power needs to be allocated if the detection result is still that the channel is idle, and otherwise, consider that the carrier is occupied by other systems and does not need to be allocated with transmission power.
For example: there are 4 unlicensed carriers C1, C2, C3, C4 in the system. At the first time T1 when the DMRS signal is transmitted, C1 is being used to transmit data, and the rest of carriers are occupied by other systems, then the carrier to which transmission power needs to be allocated is determined at time T1 to be C1. And then before the time T2 of the next DMRS signal transmission, C2 and C3 are determined to be idle through CCA detection, the base station does not transmit data on C2 and C3 until T2, then performs CCA detection again before T2, finds that C2 is still idle and C3 is occupied, and at the moment that data is still transmitted on C1, the carriers which need to be allocated with transmission power and are determined at the time T2 are C1 and C2.
According to another embodiment of the invention, after determining those carriers needing to be allocated with transmission power, the base station performs transmission power allocation according to the total amount of transmission power and the number of carriers needing to be allocated with transmission power. For example, the base station may equally allocate the total amount of transmit power to those carriers, which is the simplest method. Corresponding power distribution can be carried out according to the service type, the load condition and the like, and the sum of the transmitting power distributed to each carrier is ensured not to exceed the total limit of the transmitting power.
According to another embodiment of the present invention, considering that the base station cannot use the muted carriers during the muting, in order to shorten the muting period as much as possible, it may be considered to shorten the interval between two DMRS transmissions, i.e., to transmit more DMRS signals on one subframe, and thus, the base station may determine which time instants to transmit DMRS signals on each subframe. In this way, the base station can perform flexible configuration, and certainly, the base station needs to transmit the configuration information of the time for transmitting the DMRS to the UE through the authorized carrier, so as to ensure correct operation of the UE at the receiving end.
Fig. 1 shows a flow chart of CCA operation according to the above embodiment, including:
s11, the base station determines a carrier needing to be allocated with transmitting power in the unauthorized carrier before the moment of sending the demodulation reference signal each time;
and S12, the base station distributes the transmitting power to the carrier needing to be distributed with the transmitting power at the moment of sending the demodulation reference signal each time.
Corresponding to the above power allocation method, the present invention also provides an improved channel estimation method, considering that the transmission power of each unlicensed carrier may change after each DMRS signal is transmitted, so that the channel parameters before the latest transmission power allocation no longer have significance for the current channel estimation, and considering only the latest transmission power allocation result is more reasonable. For example, in the above example, the transmission power of the C1 channel changes at the time T1 and the time T2, and therefore the power variable used in channel estimation also needs to change, so the present invention proposes to use the power variable of the last DMRS signal transmission for channel estimation. That is, the power variable of the DMRS signal is transmitted using the T1 time between T1 and T2, the power variable of the DMRS signal is transmitted using the T2 time between T2 and T3, and so on.
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 allocating transmit power to unlicensed carriers in a base station of an LTE communication system according to the present invention, the apparatus comprising:
a determining module 2001, configured to determine, by the base station, a carrier to which transmission power needs to be allocated in the unlicensed carriers before a time when the base station sends a demodulation reference signal each time;
an allocating module 2002, configured to perform transmit power allocation on the carrier needing to be allocated with transmit power at a time when the base station sends a demodulation reference signal each time.
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 (14)
1. A method for allocating transmission power of unlicensed carriers in a base station of an LTE communication system, wherein the number of the unlicensed carriers is greater than one, the method comprising:
b. the base station determines a carrier needing to distribute transmitting power in the unauthorized carriers before the moment of sending the demodulation reference signal each time; and
c. and the base station allocates the transmission power to the carrier needing to be allocated with the transmission power at the moment of sending the demodulation reference signal each time.
2. The method of claim 1, wherein the step b further comprises:
b1. if one carrier in the unlicensed carriers is used by the base station for sending data before the time when the base station sends the demodulation reference signal, the carrier is determined by the base station to be the carrier needing to be allocated with the transmission power; and
b2. and if the base station carries out idle channel detection on one carrier in the unauthorized carriers before the time of sending the demodulation reference signal and determines that the carrier is idle, the carrier is determined as the carrier needing to be allocated with the transmitting power by the base station.
3. The method of claim 2, wherein the step b2 further comprises:
and when the base station determines that the carrier is idle, the base station does not transmit data on the carrier from the moment of finishing the idle channel detection until the next moment of transmitting the demodulation reference signal.
4. The method of claim 3, further comprising:
and the base station carries out idle channel detection on the carrier again before the next time of sending the demodulation reference signal, and if the carrier is determined to be idle, the carrier is determined to be the carrier needing to be allocated with the transmitting power by the base station.
5. The method of claim 1, wherein the step c further comprises:
and the base station allocates the transmitting power according to the total transmitting power on the unauthorized carrier and the number of the carriers needing to allocate the transmitting power.
6. The method of claim 5, further comprising:
and the base station distributes the transmitting power evenly according to the total transmitting power and the number of the carriers needing to distribute the transmitting power.
7. The method of claim 1, wherein prior to step b, further comprising:
a. and the base station determines the time for sending the demodulation reference signal, and sends the time for sending the demodulation reference signal to the user equipment through an authorized carrier.
8. An apparatus for allocating transmission power to unlicensed carriers in a base station of an LTE communication system, wherein the number of unlicensed carriers is greater than one, the apparatus comprising:
a determining module, configured to determine, by the base station, a carrier to which transmission power needs to be allocated in the unlicensed carriers before a time when the base station sends a demodulation reference signal each time; and
and the allocation module is used for allocating the transmission power to the carrier needing to be allocated with the transmission power at the moment that the base station sends the demodulation reference signal each time.
9. The device of claim 8, wherein the determination module is further to:
if one carrier in the unlicensed carriers is used by the base station for sending data before the time when the base station sends the demodulation reference signal, the carrier is determined by the base station to be the carrier needing to be allocated with the transmission power; and
and if the base station carries out idle channel detection on one carrier in the unauthorized carriers before the time of sending the demodulation reference signal and determines that the carrier is idle, the carrier is determined as the carrier needing to be allocated with the transmitting power by the base station.
10. The apparatus of claim 9, further to:
and when the base station determines that the carrier is idle, the base station does not transmit data on the carrier from the moment of finishing the idle channel detection until the next moment of transmitting the demodulation reference signal.
11. The apparatus of claim 10, further to:
and the base station carries out idle channel detection on the carrier again before the next time of sending the demodulation reference signal, and if the carrier is determined to be idle, the carrier is determined to be the carrier needing to be allocated with the transmitting power by the base station.
12. The device of claim 8, wherein the assignment module is further to:
and the base station allocates the transmitting power according to the total transmitting power on the unauthorized carrier and the number of the carriers needing to allocate the transmitting power.
13. The apparatus of claim 12, further to:
and the base station distributes the transmitting power evenly according to the total transmitting power and the number of the carriers needing to distribute the transmitting power.
14. The apparatus of claim 8, further comprising:
a sending module, configured to determine, by the base station, the time for sending the demodulation reference signal, and send, by the base station, the time for sending the demodulation reference signal to the user equipment through an authorized carrier.
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| CN201510843267.1A CN106804041B (en) | 2015-11-26 | 2015-11-26 | Wireless communication method and device |
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| CN201510843267.1A CN106804041B (en) | 2015-11-26 | 2015-11-26 | Wireless communication method and device |
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| CN106804041A CN106804041A (en) | 2017-06-06 |
| CN106804041B true CN106804041B (en) | 2019-12-27 |
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| US8155688B2 (en) * | 2008-11-10 | 2012-04-10 | Lg Electronics Inc. | Method and apparatus for adjusting power control mode in wireless communication system |
| JP5271373B2 (en) * | 2011-03-24 | 2013-08-21 | シャープ株式会社 | Base station, terminal, communication system, communication method, and integrated circuit |
| US8811144B2 (en) * | 2011-11-04 | 2014-08-19 | Intel Corporation | User equipment (UE)-specific assignment of demodulation reference signal (DMRS) sequences to support uplink (UL) coordinated multipoint (CoMP) |
| WO2013067430A1 (en) * | 2011-11-04 | 2013-05-10 | Interdigital Patent Holdings Inc. | Method and apparatus for power control for wireless transmissions on multiple component carriers associated with multiple timing advances |
| CN105099642B (en) * | 2014-05-19 | 2019-06-07 | 中兴通讯股份有限公司 | A kind of data transmission method, device and computer storage medium |
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