CN101394208B - Indicating power distributing method, system, base station and customer terminal of MIMO system - Google Patents
Indicating power distributing method, system, base station and customer terminal of MIMO system Download PDFInfo
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Abstract
The invention provides a method, a system, a base station, and a user terminal to distribute an indicated power of a multi-input multi-output control system, wherein, the method comprises the following steps: a power distribution information table which is shared by users and the base station are preset in the system; a power distribution value of each user in the system and an actual down stream rank value which is shared by the base station and the users are acquired; a reference power value which is matched with the power distribution value in the power distribution information table is searched by the base station according to the power distribution value and the actual downstream rank value; a control indicated message which corresponds to the matched reference power value is sent by the station to the corresponding user; and the corresponding reference power value is acquired through the way of searching in the power distribution table according to the control indicated message and the actual downstream rank value. The invention has the advantage of sending a power indication which is not equally distributed to the each user. Furthermore, compared with a system which equally distributes the power, the invention gains greater performance gain.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to an indication power allocation method and system for a mimo system, a base station, and a user terminal.
Background
In a Multiple-Input Multiple-Output (MIMO) wireless communication technology, Multiple antennas are simultaneously configured at a transmitting end and a receiving end, so that the spectrum efficiency of a system can be improved without increasing the bandwidth of the system, and the MIMO wireless communication technology becomes a key technology for realizing high-speed wireless transmission. In cellular radio communication and wireless local area network systems, a base station needs to communicate with Multiple users simultaneously, which is a so-called Multi-user Multiple-input-Multiple-output (MU-MIMO) system. In the system, the potential multi-user diversity of the system can be fully utilized by scheduling and power distribution of proper users, and the performance gain of the system is obviously improved.
At present, there are many methods for multi-user scheduling and power allocation in the MU-MIMO system, but applying these methods to the practical communication system also involves a problem: an indication of the result of the power allocation, in other words how to tell the user the result of the power allocation.
In standards for communication systems such as 3GPP LTE, MU-MIMO can schedule two data streams at most simultaneously, and therefore a maximum of two users can be spatially multiplexed (since LTE specifies that each user in MU-MIMO can only transmit one data stream). The scheduling result, the power allocation result, and the corresponding control information of each user are indicated by a Physical Downlink Control CHannel (PDCCH). The PDCCH indicating the scheduled user in MU-MIMO is a Downlink Control Indicator (DCI) in which one-bit data is set for indicating whether one user is currently scheduled or two users are currently scheduled.
For example, when the bit is 0, it indicates that two users are scheduled, so the power of each user is 1/2 total transmit power, i.e., there is a-3 dB attenuation compared to single user transmit power; when the bit is 1, it means that only one user is scheduled to, and the scheduled user gets the total transmission power.
That is, in existing communication systems such as 3GPP LTE, the power between different users, different data streams, is evenly distributed, i.e. the power is distributed
Ps＝PTx/N
Wherein P issCorresponding transmission power, P, for each data streamTxFor the total transmit power, N is the number of data streams of MU-MIMO participating in spatial multiplexing, and may take two values: 1 or 2. This method has the advantage of being very simple, both at the transmitting end and at the receiving end, without having to consider whether the power between the signal and the interference is the same. However, the disadvantage of evenly distributing power is also evident: a greater performance gain of the system cannot be obtained by fully exploiting the degrees of freedom brought by the power adjustment between the data streams.
In the 3GPP LTE-Advanced system, the maximum number of multiplexing users may reach 4, that is, on each time-frequency resource scheduling unit, 4 data streams need to be transmitted correspondingly at most. When power indication is performed based on the power average allocation result used in the current 3GPP LTE, only average power allocation can still be achieved, and similarly, the system cannot fully utilize the degree of freedom brought by power adjustment between data streams, so as to obtain a greater performance gain.
In view of the above, the technical problems that need to be solved urgently by those skilled in the art are: how to transmit power indications of non-even distribution to each user to be called in the MU-MIMO system, thereby obtaining larger performance gain compared with the system of even power distribution.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provided are a method, a system, a base station, and a user terminal for indicating power allocation in a multi-input multi-output system, which can transmit a power indication of non-average allocation to each user to be scheduled in an MU-MIMO system, and can obtain a higher performance gain than that of an average power allocation system.
In order to solve the above problems, the present invention discloses an indication power allocation method for a multi-user multiple-input multiple-output system, comprising the following steps: presetting a power distribution information table shared by a base station and a user in the system, wherein the power distribution information table comprises: a plurality of reference downlink rank values, a plurality of reference control indication information, and a reference power value corresponding to each of the reference downlink rank values and each of the reference control indication information; acquiring a power distribution value of each user in the system and an actual downlink rank value shared by the base station and each user; the base station searches a reference power value matched with the power distribution value in the power distribution information table according to the power distribution value and the actual downlink rank value; sending the control indication information corresponding to the matched reference power value to a corresponding user; and searching and obtaining a corresponding reference power value in a power distribution information table by the user according to the control indication information and the actual downlink rank value.
Preferably, the obtaining of the power allocation value comprises the following steps: acquiring channel quality indications fed back by each user in the system; carrying out user scheduling according to the channel quality indication and carrying out power distribution; and quantizing the power distribution result.
Preferably, the actual downlink rank value is a downlink rank value preset by the user through a radio resource control signaling and notified to the base station.
Preferably, the obtaining of the actual downlink rank value may also be: and the base station presets and informs the actual downlink rank value of the user.
The invention also discloses a method for indicating power distribution of the multi-user multi-input multi-output system, which comprises the following steps: presetting a power distribution information table shared by a base station and a user in the system, wherein the power distribution information table comprises: a plurality of reference downlink rank values, a plurality of reference control indication information, and a reference power value corresponding in common to each of the reference downlink rank values and each of the reference control indication information; acquiring a scheduled user in the system and an actual downlink rank value shared by a base station and the scheduled user; performing power allocation combination on the scheduled users according to a plurality of reference power values corresponding to the actual downlink rank values in the power allocation information table; calculating the overall performance gain of the combination of power allocations and selecting the combination of power allocations with the maximum overall performance gain; determining the reference control indication information corresponding to the scheduled user in the combination according to the power distribution information table; sending the reference control indication information to a corresponding user; and searching and obtaining a corresponding reference power value in a power distribution information table by the user according to the control indication information and the actual downlink rank value.
Preferably, the acquiring the scheduled user in the system specifically includes: acquiring channel quality indications fed back by each user in the system; and acquiring the scheduled user in the system according to the channel quality indication.
Preferably, the actual downlink rank value is a downlink rank value preset by the user through a radio resource control signaling and notified to the base station.
Preferably, the following actual following rank values are obtained specifically: and the base station presets and informs the actual downlink rank value of the user.
In another aspect, the present invention also discloses a system for indicating power allocation of a multi-user multiple-input multiple-output system, the system comprising: the device comprises a power distribution information table presetting unit, a power distribution value acquiring unit, an actual downlink rank value acquiring unit, a power distribution information searching unit, a reference control indication information sending unit and a control indication information analyzing unit.
The power distribution information table presetting unit is used for presetting a power distribution information table shared by a base station and a user in the system, and the power distribution information table comprises: a plurality of reference downlink rank values, a plurality of reference control indication information, and a reference power value corresponding to each of the reference downlink rank values and each of the reference control indication information; the power distribution value acquisition unit is used for acquiring the power distribution value of each user in the system; the actual downlink rank value acquisition unit is used for acquiring actual downlink rank values shared by the base station and each user; the power distribution information searching unit is used for searching a reference power value matched with the power distribution value in the power distribution information table according to the power distribution value and the actual downlink rank value; the reference control indication information sending unit is used for sending the reference control indication information corresponding to the matched reference power value to a corresponding user; and the control indication information analysis unit is used for searching and obtaining a corresponding reference power value in a power distribution information table according to the reference control indication information and the actual downlink rank value.
Preferably, the power allocation value obtaining unit includes a channel quality indication obtaining subunit, a first user scheduling subunit, and a power allocation result quantizing subunit.
The channel quality indication obtaining subunit is configured to obtain a channel quality indication fed back by each user in the system; the first user scheduling subunit is used for performing user scheduling according to the channel quality indication and performing power allocation; the power distribution result quantization subunit is used for quantizing the power distribution result.
Preferably, the power allocation information searching unit and the control indication information sending unit are located at the base station end; the actual downlink rank value obtaining unit and the control indication information analyzing unit are located at the user side, the actual downlink rank value obtaining unit comprises a first preset subunit and a first notification unit, and the first preset subunit is used for a user to preset the actual downlink rank value through radio resource control signaling; the first notification unit is used for notifying the actual downlink rank value to a base station by a user; the power distribution information table presetting unit is respectively positioned at the base station end and the user end.
Preferably, the power allocation value obtaining unit, the actual downlink rank value obtaining unit, the power allocation information searching unit, and the reference control indication information sending unit are located at the base station end, and the actual downlink rank value obtaining unit includes a second preset subunit and a second notification subunit, where the second preset subunit is used for the base station to preset the actual downlink rank value; a second notification subunit, configured to notify, by the base station, the user of the actual downlink rank value; and, the control instruction information parsing unit is located at the user side, and the power distribution information table presetting unit is located at the base station side and the user side, respectively.
The invention also discloses a system for indicating power distribution of the multi-user multi-input multi-output system, which comprises: the device comprises a power distribution information table presetting unit, a user scheduling unit, an actual downlink rank value acquiring unit, a user combining unit, an overall performance gain calculating unit, a reference control indication information acquiring unit, a reference control indication information sending unit and a control indication information analyzing unit.
The power distribution information table presetting unit is used for presetting a power distribution information table shared by a base station and a user in the system, and the power distribution information table comprises: a plurality of reference downlink rank values, a plurality of reference control indication information, and a reference power value corresponding to each of the reference downlink rank values and each of the reference control indication information; the user scheduling unit is used for acquiring the scheduled users in the system; an actual downlink rank value obtaining unit, configured to obtain an actual downlink rank value shared by the base station and the scheduled user; a user combination unit, configured to perform power distribution combination on the scheduled users according to multiple reference power values corresponding to actual downlink rank values in the power distribution information table; an overall performance gain calculation unit for calculating an overall performance gain of the combination of power allocations and selecting the combination of power allocations with the greatest overall performance gain; a reference control indication information obtaining unit, configured to determine, according to the power allocation information table, reference control indication information corresponding to the scheduled user in the power allocation combination; a reference control indication information sending unit, configured to send the reference control indication information to a corresponding user; and the control indication information analysis unit is used for searching and obtaining a corresponding reference power value in the power distribution information table according to the control indication information and the actual downlink rank value.
Preferably, the user scheduling unit includes: the system comprises a channel quality indication acquisition subunit and a second user scheduling subunit, wherein the channel quality indication acquisition subunit is used for acquiring channel quality indications fed back by each user in the system; and the second user scheduling subunit is used for acquiring the scheduled users in the system according to the channel quality indication.
Preferably, the user scheduling unit, the user combining unit, the overall performance gain calculating unit, the reference control indication information acquiring unit, and the reference control indication information transmitting unit are located at the base station end; the actual downlink rank value acquisition unit and the control indication information analysis unit are positioned at the user side; the actual downlink rank value acquisition unit includes: the first preset subunit is used for presetting the actual downlink rank value by a user through radio resource control signaling; a first notification unit, configured to notify the base station of the actual downlink rank value by a user; and the power distribution information table presetting unit is respectively positioned at the base station end and the user end.
Preferably, the user scheduling unit, the actual downlink rank value obtaining unit, the user combining unit, the overall performance gain calculating unit, the reference control indication information obtaining unit, and the reference control indication information sending unit are located at the base station end; the actual downlink rank value acquisition unit includes: the base station comprises a second preset subunit and a second informing subunit, wherein the second preset subunit is used for presetting an actual downlink rank value by the base station; the second informing subunit is used for informing the base station of the actual downlink rank value to the user; the control indication information analysis unit is positioned at the user side; and, the power distribution information table presetting unit is respectively located at the base station end and the user end.
The invention also discloses a base station of the multi-user multi-input multi-output system, which comprises: the device comprises a power distribution information table presetting unit, a power distribution value acquiring unit, a base station side actual downlink rank value acquiring unit, a power distribution information searching unit and a reference control indication information sending unit.
The power distribution information table presetting unit is used for presetting a power distribution information table shared by a base station and a user, and the power distribution information table comprises a plurality of reference downlink rank values, a plurality of reference control indication information and reference power values corresponding to each reference downlink rank value and each reference control indication information; the power distribution value acquisition unit is used for acquiring the power distribution value of each user in the system; the base station side actual downlink rank value acquisition unit is used for acquiring actual downlink rank values shared by the base station and each user and sending the actual downlink rank values to corresponding users; or, the method is used for receiving an actual downlink rank value sent by a user; a power distribution information searching unit, configured to search, according to the power distribution value and an actual downlink rank value, a reference power value matching the power distribution value in the power distribution information table; and a reference control indication information sending unit, configured to send the reference control indication information corresponding to the matched reference power value to a corresponding user.
The invention also discloses a base station of the multi-user multi-input multi-output system, which comprises: the device comprises a power distribution information table presetting unit, a user scheduling unit, a base station side actual downlink rank value obtaining unit, a user combining unit, an overall performance gain calculating unit, a reference control indication information obtaining unit and a reference control indication information sending unit.
The power distribution information table presetting unit is used for presetting a power distribution information table shared by a base station and a user, and the power distribution information table comprises a plurality of reference downlink rank values, a plurality of reference control indication information and reference power values corresponding to each reference downlink rank value and each reference control indication information; the user scheduling unit is used for acquiring the scheduled users in the system; the base station side actual downlink rank value acquisition unit is used for acquiring an actual downlink rank value shared by the base station and the scheduled user and sending the actual downlink rank value to the corresponding user; or, the method is used for receiving an actual downlink rank value sent by a user; the user combination unit is used for combining the power distribution of the scheduled users according to a plurality of reference power values corresponding to the actual downlink rank values in the power distribution information table; the overall performance gain calculation unit is used for calculating the overall performance gain of the combination of the power distribution and selecting the combination of the power distribution with the maximum overall performance gain; the reference control indication information acquisition unit is used for determining reference control indication information corresponding to the scheduled user in the power distribution combination according to the power distribution information table; and the reference control indication information sending unit is used for sending the reference control indication information to a corresponding user.
The invention also discloses a user terminal of the multi-user multi-input multi-output system, which comprises: the device comprises a power distribution information table presetting unit, a user side actual downlink rank value acquisition unit and a control indication information analysis unit.
The user side actual downlink rank value acquisition unit is used for acquiring an actual downlink rank value shared by a base station and the scheduled user and sending the actual downlink rank value to the corresponding base station; or, the base station is configured to receive an actual downlink rank value sent by the base station; the control indication information analysis unit is used for searching and obtaining a corresponding reference power value in the power distribution information table according to the reference control indication information and the actual downlink rank value sent by the base station; the reference control indication information sent by the base station is control indication information corresponding to a reference power value matched with the power distribution value, which is searched in the power distribution information table according to the power distribution value and the actual downlink rank value; the power distribution value is the power distribution value of each user in the system, which is acquired by the base station.
The invention also discloses a user terminal of the multi-user multi-input multi-output system, which comprises: the device comprises a power distribution information table presetting unit, a user side actual downlink rank value acquisition unit and a control indication information analysis unit.
The power distribution information table presetting unit is used for presetting a power distribution information table shared by a base station and a user, and the power distribution information table comprises a plurality of reference downlink rank values, a plurality of reference control indication information and reference power values corresponding to each reference downlink rank value and each reference control indication information; the user side actual downlink rank value acquisition unit is used for acquiring an actual downlink rank value shared by a base station and the scheduled user and sending the actual downlink rank value to a corresponding base station; or, the base station is configured to receive an actual downlink rank value sent by the base station; the control indication information analysis unit is used for searching and obtaining a corresponding reference power value in the power distribution information table according to the reference control indication information and the actual downlink rank value sent by the base station; the reference control indication information sent by the base station is as follows: control indication information which is determined according to the reference power value obtained by each user in the combination of the power distribution with the maximum overall performance gain and corresponds to the power distribution information table; the combination of the power allocation with the maximum overall performance gain is as follows: and the base station performs power distribution combination on the scheduled users according to a plurality of reference power values corresponding to the actual downlink rank values in the power distribution information table, calculates the overall performance gain of the power distribution combination, and further obtains the power distribution combination with the maximum overall performance gain.
Compared with the prior art, the invention has the following advantages: aiming at the problem that when the power distribution method in the existing 3GPP LTE system is transplanted to a 3GPP LTE-Advanced system, the power average distribution can only be realized, the power distribution value of each user acquired by a base station is compared with data in a power distribution information table according to information such as the power distribution information table and a downlink rank value, a matched reference power value is obtained by searching, and the base station sends control indication information corresponding to the matched reference power value to a user terminal; and the user terminal analyzes the received control indication information according to the power distribution information table and the downlink rank value so as to obtain the power distributed by the base station for each user. Since the reference power value in the power allocation information table is not an evenly allocated power value, in the MU-MIMO system, a non-evenly allocated power indication can be sent to each user to be called, and thus, a greater performance gain can be obtained compared to an evenly allocated system.
Drawings
FIG. 1 is a flow chart of steps of an embodiment of a method of indicating power allocation for a MU-MIMO system in accordance with the present invention;
FIG. 2 is a flow chart of steps of an embodiment of a method of power allocation value acquisition in the method of FIG. 1;
FIG. 3 is a flow chart of steps of another method embodiment of indicating power allocation for a MU-MIMO system in accordance with the present invention;
FIG. 4 is a flowchart illustrating steps for obtaining an embodiment of a scheduled user in the system in the method shown in FIG. 3;
FIG. 5 is a block diagram of an embodiment of a system for indicating power allocation for a MU-MIMO system in accordance with the present invention;
FIG. 6 is a schematic diagram of a power allocation value obtaining unit in an embodiment of a system for indicating power allocation in an MU-MIMO system according to the present invention;
fig. 7 is a schematic structural diagram of a first actual downlink rank value obtaining unit in an embodiment of a system for indicating power allocation of a MU-MIMO system according to the present invention;
fig. 8 is a schematic structural diagram of another first actual downlink rank value obtaining unit in the system embodiment indicating power allocation of the MU-MIMO system according to the present invention;
FIG. 9 is a block diagram of another embodiment of a system for indicating power allocation for a MU-MIMO system in accordance with the present invention;
FIG. 10 is a schematic diagram of a user scheduling unit in an embodiment of the system for indicating power allocation in the MU-MIMO system according to the present invention;
fig. 11 is a schematic structural diagram of an actual downlink rank value obtaining unit in an embodiment of a system for indicating power allocation of a MU-MIMO system according to the present invention;
fig. 12 is a schematic diagram of another structure of an actual downlink rank value obtaining unit in an embodiment of a system for indicating power allocation in a MU-MIMO system according to the present invention;
FIG. 13 is a schematic diagram of a base station embodiment of a MU-MIMO system according to the present invention;
fig. 14 is a schematic structural diagram of an embodiment of a user terminal under the coverage of the base station in fig. 13;
fig. 15 is a schematic structural diagram of another embodiment of a base station of the MU-MIMO system according to the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The core idea of the invention is as follows: comparing the power distribution value of each user acquired by the base station with data in the power distribution information table according to the information such as the power distribution information table, the downlink rank value and the like, searching to obtain a matched reference power value, and sending control indication information corresponding to the matched reference power value to the user terminal by the base station; and the user terminal analyzes the received control indication information according to the power distribution information table and the downlink rank value so as to obtain the power distributed by the base station for each user.
Referring to fig. 1, a flow chart of steps of an embodiment of a method of indicating power allocation for a MU-MIMO system according to the present invention is shown, comprising the steps of:
step 101: presetting a power distribution information table shared by a base station and a user in a system, wherein the power distribution information table comprises: a plurality of reference downlink rank values, a plurality of reference control indication information, and a reference power value corresponding to each reference downlink rank value and each reference control indication information;
step 102: acquiring a power distribution value of each user in the system and an actual downlink rank value shared by the base station and each user;
step 103: the base station searches a reference power value matched with the power distribution value in a power distribution information table according to the power distribution value and the actual downlink rank value;
step 104: sending the control indication information corresponding to the matched reference power value to a corresponding user;
step 105: and the user searches and obtains a corresponding reference power value in the power distribution information table according to the control indication information and the actual downlink rank value.
In step 101, the power allocation information table includes: the base station includes a plurality of reference downlink rank values, a plurality of reference control indication information, and a reference power value corresponding to each reference downlink rank value and each reference control indication information.
For the actual downlink rank value in step 102, it is a relatively long-lasting parameter compared to the period of data transmission, i.e. the downlink rank value will remain unchanged for a long period of time for the user, and will not change every subframe like the control indication information. The downlink rank value may be that all users in the whole cell under the coverage of the base station are the same, or that different users in the cell have different parameters.
In step 103, "matching" may be interpreted as "closest", that is, the base station finds the reference power value closest to the power allocation value in the power allocation information table according to the power allocation value and the actual downlink rank value, in other words, finds that the absolute value of the difference between the reference power value and the power allocation value is the smallest.
Preferably, the actual downlink rank value is preset by the user according to RRC (radio resource control) signaling, and the user notifies the base station after the parameter is preset.
Of course, the actual downlink rank value is not limited to specifying the parameter through the radio resource Control signaling, but may also be through other higher layer signaling, for example, MAC (media access Control) signaling may also be used, and is not listed here.
In addition, the actual downlink rank value may also be shared by the user and the base station by: the parameters are preset by the base station, which then informs the user of the parameters.
Referring to fig. 2, there is shown a flow chart of steps of an embodiment of a method for obtaining power allocation values in step 102 in the method shown in fig. 1, including:
step 201: acquiring channel quality indications fed back by each user in the system;
wherein, the channel quality can be obtained from the user terminal through a feedback channel, for example, a Frequency Division Duplex (FDD) system; the channel estimation can also be performed directly through the uplink pilot information, for example, in a Time Division Duplex (TDD) system.
Step 202: carrying out user scheduling according to the channel quality indication and carrying out power distribution;
specifically, the base station performs a multi-user MIMO call according to the acquired Channel Quality Indicator (CQI), and in this step, processing such as CQI update may be included. In this step, power allocation is also performed to the scheduled users, and the power allocation here may utilize any existing power allocation method.
Step 203: and quantizing the power distribution result.
The reason why quantization is performed is: the number of reference power values in the above power information allocation table is limited.
For example, in MU-MIMO, three users, user 1, user 2, and user 3, are assumed, where the rank value of user 1 is 1, the rank value of user 2 is 2, and the rank value of user 3 is 1.
At the current time, the base station schedules to two users: user 1 and user 2, and according to the existing power allocation method, the result of quantized power allocation is: user 1 gets power 0.3P, where P is the total transmit power and user 2 gets power 0.7P.
Then, according to the power allocation information table shown in table 1, the base station selects a reference power value matching 0.3P from the column corresponding to the rank value 1 for user 1, which is 1/3P, and the corresponding control indication information is "10"; the base station selects a reference power value matching 0.7P from the column corresponding to rank value 2 for user 2, which is 3/4P, and the corresponding control instruction information is "11".
Then, the base station sends control instruction information such as "10" and "11" to each user in MU-MIMO, and according to the control instruction information "10", the user 1 searches power 1/3P allocated by the base station from the power allocation information table shown in table 1 in combination with its own rank value 1; similarly, user 2 searches power 3/4P allocated by the base station from the power allocation information table shown in table 1 according to control instruction information "11" thereof, in combination with rank value 2 of itself.
Table 1: power distribution information table
Referring to fig. 3, fig. 3 shows a flow chart of steps of another embodiment of a method of indicating power allocation for a MU-MIMO system according to the present invention, comprising the steps of:
step 301: presetting a power distribution information table shared by a base station and a user in the system;
step 302: acquiring a scheduled user in the system and an actual downlink rank value shared by a base station and the scheduled user;
step 303: performing power allocation combination on the scheduled users according to a plurality of reference power values corresponding to the actual downlink rank values in the power allocation information table;
step 304: calculating the overall performance gain of the combination of power allocations and selecting the combination of power allocations with the maximum overall performance gain;
step 305: determining the reference control indication information corresponding to the scheduled user in the combination according to the power distribution information table;
step 306: sending the reference control indication information to a corresponding user;
step 307: and searching and obtaining a corresponding reference power value in a power distribution information table by the user according to the control indication information and the actual downlink rank value.
Wherein, in step 301, the power allocation information table includes: the base station apparatus includes a plurality of reference downlink rank values, a plurality of reference control indication information, and a reference power value corresponding in common to each of the reference downlink rank values and each of the reference control indication information.
Referring to fig. 4, a flowchart illustrating steps of acquiring an embodiment of a scheduled user in the system in step 302 in the method illustrated in fig. 3 is shown, including the following steps:
step 401: acquiring channel quality indications fed back by each user in the system;
step 402: and acquiring the scheduled user in the system according to the channel quality indication.
Preferably, the actual downlink rank value is a parameter preset by the user according to RRC (radio resource control) signaling, and the user notifies the base station after the parameter is preset.
Of course, the actual downlink rank value is not limited to the parameter specified by the rrc signaling, but may also be other higher layer signaling, for example, MAC (media access Control) signaling, which is not listed here.
In addition, the actual downlink rank value may also be shared by the user and the base station by: the parameters are preset by the base station, which then informs the user of the parameters.
That is, the present invention is not limited to how the actual downlink rank value is shared by the base station and the user, and the actual downlink rank value should be a parameter that changes for a long time.
Referring to fig. 5, there is shown a schematic structural diagram of an embodiment of a system for indicating power allocation of a MU-MIMO system according to the present invention, the system comprising:
power allocation information table presetting unit 501: a power allocation information table for presetting power allocation information shared by a base station and a user in the system, wherein the power allocation information table comprises: a plurality of reference downlink rank values, a plurality of reference control indication information, and a reference power value corresponding to each of the reference downlink rank values and each of the reference control indication information;
a power allocation value obtaining unit 502, configured to obtain a power allocation value of each user in the system;
an actual downlink rank value obtaining unit 503, configured to obtain an actual downlink rank value shared by the base station and each user;
a power allocation information searching unit 504, configured to search, according to the power allocation value and the actual downlink rank value, a reference power value matching the power allocation value in the power allocation information table;
a reference control indication information sending unit 505, configured to send the reference control indication information corresponding to the matched reference power value to a corresponding user;
a control indication information parsing unit 506, configured to search for a corresponding reference power value in a power allocation information table according to the reference control indication information and the actual downlink rank value.
The power allocation information table presetting unit 501 is information shared by the user side and the base station side, so the unit should be provided in both the user side and the base station, and in the remaining structural units, the power allocation value obtaining unit 502, the power allocation information searching unit 504, and the reference control indication information sending unit 505 should be located in the base station segment, the control indication information analyzing unit 506 should be located in the user side, and the actual downlink rank value obtaining unit 503 may be located at the base station side or at the user side.
Referring to fig. 6, in the system embodiment of indicating power allocation in the MU-MIMO system according to the present invention, a schematic structural diagram of the power allocation value obtaining unit includes:
a channel quality indicator obtaining subunit 601, configured to obtain channel quality indicators fed back by users in the system;
a first user scheduling subunit 602, configured to perform user scheduling according to the channel quality indicator, and perform power allocation.
A power allocation result quantizing subunit 603, configured to quantize the power allocation result.
Referring to fig. 7, a schematic structural diagram of an actual downlink rank value obtaining unit in a system embodiment indicating power allocation of the MU-MIMO system according to the present invention is shown, including:
a first presetting subunit 701, configured to preset, by a user, the actual downlink rank value through radio resource control signaling;
a first notifying unit 702, configured to notify the base station of the actual downlink rank value by the user.
Obviously, the actual downlink rank value obtaining unit with the above structure is located at the user end.
In addition, the actual downlink rank value acquiring unit may include, as shown in fig. 8:
a second presetting subunit 801, configured to preset an actual downlink rank value by the base station;
a second notifying subunit 802, configured to notify the user of the actual downlink rank value by the base station.
Obviously, the actual downlink rank value acquisition unit having the above structure is located at the base station side.
Referring to fig. 9, a schematic structural diagram of another embodiment of a system for indicating power allocation of a MU-MIMO system according to the present invention is shown, which includes:
a power allocation information table presetting unit 901, configured to preset a power allocation information table shared by a base station and a user in the system, where the power allocation information table includes: a plurality of reference downlink rank values, a plurality of reference control indication information, and a reference power value corresponding to each of the reference downlink rank values and each of the reference control indication information;
a user scheduling unit 902, configured to obtain a user scheduled in the system;
an actual downlink rank value obtaining unit 903, configured to obtain an actual downlink rank value shared by the base station and the scheduled user;
a user combining unit 904, configured to perform power allocation combination on the scheduled users according to a plurality of reference power values corresponding to the actual downlink rank values in the power allocation information table;
an overall performance gain calculation unit 905 configured to calculate an overall performance gain of the combination of power allocations, and select a combination of power allocations with the greatest overall performance gain;
a reference control indication information obtaining unit 906, configured to determine, according to the power allocation information table, reference control indication information corresponding to the scheduled user in the power allocation combination;
a reference control indication information sending unit 907, configured to send the reference control indication information to a corresponding user;
a control indication information parsing unit 908, configured to search for a corresponding reference power value in the power allocation information table according to the control indication information and the actual downlink rank value.
Referring to fig. 10, a schematic structural diagram of a user scheduling unit in a system embodiment for indicating power allocation of the MU-MIMO system according to the present invention is shown, including:
a channel quality indicator obtaining subunit 1001, configured to obtain a channel quality indicator fed back by each user in the system;
a second user scheduling subunit 1002, configured to obtain the scheduled user in the system according to the channel quality indicator.
Referring to fig. 11, a schematic structural diagram of an actual downlink rank value obtaining unit in a system embodiment indicating power allocation of the MU-MIMO system according to the present invention is shown, where the schematic structural diagram includes:
a first preset subunit 1101, configured to preset, by a user, the actual downlink rank value through radio resource control signaling;
a first notifying unit 1102, configured to notify the base station of the actual downlink rank value by the user.
In addition, the actual downlink rank value acquisition unit may have a configuration as shown in fig. 12, and include:
a second preset subunit 1201, configured to preset, by the base station, an actual downlink rank value;
a second notification subunit 1202, configured to notify the user of the actual downlink rank value by the base station.
Referring to fig. 13, there is shown a schematic structural diagram of an embodiment of a base station of a MU-MIMO system according to the present invention, wherein the base station 130 comprises:
power allocation information table presetting unit 1301: the power distribution information table is used for presetting a base station and a user share, and comprises a plurality of reference downlink rank values, a plurality of reference control indication information and reference power values corresponding to each reference downlink rank value and each reference control indication information;
a power allocation value obtaining unit 1302, configured to obtain a power allocation value of each user in the system;
an actual downlink rank value obtaining unit 1303, configured to obtain an actual downlink rank value shared by the base station and each user;
a power allocation information searching unit 1304, configured to search, according to the power allocation value and the actual downlink rank value, a reference power value matching the power allocation value in a power allocation information table;
a reference control indication information sending unit 1305, configured to send the reference control indication information corresponding to the matched reference power value to the corresponding user.
Referring to fig. 14, fig. 14 is a schematic structural diagram of an embodiment of the user terminal under the coverage of the base station in fig. 13, and the user terminal 140 includes:
power distribution information table presetting unit 1401: the power distribution information table is used for presetting a base station and a user share, and comprises a plurality of reference downlink rank values, a plurality of reference control indication information and reference power values corresponding to each reference downlink rank value and each reference control indication information;
an actual downlink rank value obtaining unit 1402, configured to obtain an actual downlink rank value shared by the base station and the scheduled user;
a control indication information analyzing unit 1403, configured to search for a corresponding reference power value in the power allocation information table according to the reference control indication information sent by the base station and the actual downlink rank value; wherein,
the reference control indication information sent by the base station is as follows: according to the power distribution value and the actual downlink rank value, control indication information corresponding to the reference power value matched with the power distribution value is searched in the power distribution information table;
the power allocation value is the power allocation value of each user in the system, which is acquired by the base station.
Referring to fig. 15, which shows a schematic structural diagram of another embodiment of a base station of the MU-MIMO system according to the present invention, the base station 150 includes:
power allocation information table presetting unit 1501: the power distribution information table is used for presetting a base station and a user share, and comprises a plurality of reference downlink rank values, a plurality of reference control indication information and reference power values corresponding to each reference downlink rank value and each reference control indication information;
a user scheduling unit 1502, configured to obtain users scheduled in the system;
an actual downlink rank value obtaining unit 1503, configured to obtain an actual downlink rank value shared by the base station and the scheduled user;
a user combining unit 1504, configured to perform power allocation combination on scheduled users according to multiple reference power values corresponding to the actual downlink rank values in the power allocation information table;
a total performance gain calculation unit 1505 for calculating the total performance gain of the combination of power allocations and selecting the combination of power allocations for which the total performance gain is the largest;
a reference control indication information obtaining unit 1506, configured to determine, according to the power allocation information table, reference control indication information corresponding to a scheduled user in the power allocation combination;
a reference control indication information transmitting unit 1507 for transmitting the reference control indication information to the corresponding user.
According to the base station shown in fig. 15, the structure of the user terminal under its coverage is similar to the embodiment of the user terminal described in fig. 14, that is, it includes:
power allocation information table presetting unit: the power distribution information table is used for presetting a base station and a user share, and comprises a plurality of reference downlink rank values, a plurality of reference control indication information and reference power values corresponding to each reference downlink rank value and each reference control indication information;
the actual downlink rank value acquisition unit is used for acquiring an actual downlink rank value shared by the base station and the scheduled user;
and the control indication information analysis unit is used for searching and obtaining a corresponding reference power value in the power distribution information table according to the reference control indication information and the actual downlink rank value sent by the base station.
However, the differences are:
the reference control indication information sent by the base station is as follows: control indication information which is determined according to the reference power value obtained by each user in the combination of the power distribution with the maximum overall performance gain and corresponds to the power distribution information table;
the combination of power allocations with the greatest overall performance gain is: and the base station performs power distribution combination on the scheduled users according to a plurality of reference power values corresponding to the actual downlink rank values in the power distribution information table, calculates the overall performance gain of the power distribution combination, and further obtains the power distribution combination with the maximum overall performance gain.
In summary, in the present invention:
through the technical means of presetting a power distribution information table shared by the user and the base station, a downlink rank value and the like, the power distribution result of each user in the MU-MIMO system is indicated to the corresponding user, so that the MU-MIMO system obtains higher performance gain.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
The method and system for indicating power allocation of a mimo system provided by the present invention are described in detail above, and specific examples are applied herein to illustrate the principles and embodiments of the present invention, and the descriptions of the above embodiments are only used to help understand the method and core ideas of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (20)
1. An indicated power allocation method for a multi-user multiple-input multiple-output system, comprising the steps of:
presetting a power distribution information table shared by a base station and a user in the system, wherein the power distribution information table comprises: a plurality of reference downlink rank values, a plurality of reference control indication information, and a reference power value corresponding to each of the reference downlink rank values and each of the reference control indication information;
acquiring a power distribution value of each user in the system and an actual downlink rank value shared by the base station and each user;
the base station searches a reference power value matched with the power distribution value in the power distribution information table according to the power distribution value and the actual downlink rank value;
sending the control indication information corresponding to the matched reference power value to a corresponding user;
and searching and obtaining a corresponding reference power value in a power distribution information table by the user according to the control indication information and the actual downlink rank value.
2. The method for indicating power allocation according to claim 1, wherein said obtaining of the power allocation value comprises the steps of:
acquiring channel quality indications fed back by each user in the system;
carrying out user scheduling according to the channel quality indication and carrying out power distribution;
and quantizing the power distribution result.
3. The method of claim 2, wherein the actual downlink rank value is a downlink rank value preset by a user through radio resource control signaling and notified to a base station.
4. The method for indicating power allocation according to claim 2, wherein the obtaining of the actual downlink rank value is specifically:
and the base station presets and informs the actual downlink rank value of the user.
5. A method for indicating power allocation for a multiple-user multiple-input multiple-output system, comprising the steps of:
presetting a power distribution information table shared by a base station and a user in the system, wherein the power distribution information table comprises: a plurality of reference downlink rank values, a plurality of reference control indication information, and a reference power value corresponding in common to each of the reference downlink rank values and each of the reference control indication information;
acquiring a scheduled user in the system and an actual downlink rank value shared by a base station and the scheduled user;
performing power allocation combination on the scheduled users according to a plurality of reference power values corresponding to the actual downlink rank values in the power allocation information table;
calculating the overall performance gain of the combination of power allocations and selecting the combination of power allocations with the maximum overall performance gain;
determining the reference control indication information corresponding to the scheduled user in the combination according to the power distribution information table;
sending the reference control indication information to a corresponding user;
and searching and obtaining a corresponding reference power value in a power distribution information table by the user according to the control indication information and the actual downlink rank value.
6. The method of claim 5, wherein obtaining the scheduled users in the system specifically comprises:
acquiring channel quality indications fed back by each user in the system;
and acquiring the scheduled user in the system according to the channel quality indication.
7. The method of claim 6, wherein the actual downlink rank value is a downlink rank value preset by a user through radio resource control signaling and notified to a base station.
8. The method of claim 6, wherein the obtaining of the actual downlink rank value is specifically:
and the base station presets and informs the actual downlink rank value of the user.
9. A system for indicating power allocation for a multiple-user multiple-input multiple-output system, the system comprising:
power allocation information table presetting unit: a power allocation information table for presetting power allocation information shared by a base station and a user in the system, wherein the power allocation information table comprises: a plurality of reference downlink rank values, a plurality of reference control indication information, and a reference power value corresponding to each of the reference downlink rank values and each of the reference control indication information;
a power allocation value obtaining unit, configured to obtain a power allocation value of each user in the system;
the actual downlink rank value acquisition unit is used for acquiring the actual downlink rank value shared by the base station and each user;
a power distribution information searching unit, configured to search, according to the power distribution value and an actual downlink rank value, a reference power value matching the power distribution value in the power distribution information table;
a reference control indication information sending unit, configured to send the reference control indication information corresponding to the matched reference power value to a corresponding user;
and the control indication information analysis unit is used for searching and obtaining a corresponding reference power value in a power distribution information table according to the reference control indication information and the actual downlink rank value.
10. The system for indicating power allocation of a mu-mimo system according to claim 9, wherein the power allocation value obtaining unit comprises:
a channel quality indication obtaining subunit, configured to obtain a channel quality indication fed back by each user in the system;
the first user scheduling subunit is used for performing user scheduling according to the channel quality indication and performing power distribution;
and the power distribution result quantization subunit is used for quantizing the power distribution result.
11. The system for indicating power allocation of mu-mimo system according to claim 10, wherein the power allocation information searching unit and the control indication information transmitting unit are located at the base station side;
the actual downlink rank value obtaining unit and the control indication information parsing unit are located at the user side, and the actual downlink rank value obtaining unit includes:
a first presetting subunit, configured to preset, by a user, the actual downlink rank value through radio resource control signaling;
a first notification unit, configured to notify the base station of the actual downlink rank value by a user;
the power distribution information table presetting unit is respectively positioned at the base station end and the user end.
12. The system for indicating power allocation of mu-mimo system according to claim 10, wherein the power allocation value obtaining unit, the actual downlink rank value obtaining unit, the power allocation information searching unit, and the reference control indication information transmitting unit are located at the bs side, and the actual downlink rank value obtaining unit comprises:
the second preset subunit is used for presetting an actual downlink rank value by the base station;
a second notification subunit, configured to notify, by the base station, the user of the actual downlink rank value; and,
the control indication information analysis unit is positioned at the user side;
the power distribution information table presetting unit is respectively positioned at the base station end and the user end.
13. A system for indicating power allocation for a multiple-user multiple-input multiple-output system, the system comprising:
a power distribution information table presetting unit, configured to preset a power distribution information table shared by a base station and a user in the system, where the power distribution information table includes: a plurality of reference downlink rank values, a plurality of reference control indication information, and a reference power value corresponding to each of the reference downlink rank values and each of the reference control indication information;
the user scheduling unit is used for acquiring the scheduled users in the system;
an actual downlink rank value obtaining unit, configured to obtain an actual downlink rank value shared by the base station and the scheduled user;
a user combination unit, configured to perform power distribution combination on the scheduled users according to multiple reference power values corresponding to actual downlink rank values in the power distribution information table;
an overall performance gain calculation unit for calculating an overall performance gain of the combination of power allocations and selecting the combination of power allocations with the greatest overall performance gain;
a reference control indication information obtaining unit, configured to determine, according to the power allocation information table, reference control indication information corresponding to the scheduled user in the power allocation combination;
a reference control indication information sending unit, configured to send the reference control indication information to a corresponding user;
and the control indication information analysis unit is used for searching and obtaining a corresponding reference power value in the power distribution information table according to the control indication information and the actual downlink rank value.
14. The system for indicating power allocation for a multiple-user multiple-input multiple-output system according to claim 13, wherein said subscriber scheduling unit comprises:
a channel quality indication obtaining subunit, configured to obtain a channel quality indication fed back by each user in the system;
and the second user scheduling subunit is used for acquiring the scheduled users in the system according to the channel quality indication.
15. The system for indicating power allocation of mu-mimo system according to claim 14, wherein the user scheduling unit, the user combining unit, the overall performance gain calculating unit, the reference control indication information obtaining unit, and the reference control indication information transmitting unit are located at the base station;
the actual downlink rank value acquisition unit and the control indication information analysis unit are positioned at the user side; and,
the actual downlink rank value acquisition unit includes:
a first presetting subunit, configured to preset, by a user, the actual downlink rank value through radio resource control signaling;
a first notifying unit for notifying the actual downlink rank value to a base station by a user, and,
the power distribution information table presetting unit is respectively positioned at the base station end and the user end.
16. The system for indicating power allocation of a mu-mimo system according to claim 14, wherein the user scheduling unit, the actual downlink rank value obtaining unit, the user combining unit, the overall performance gain calculating unit, the reference control indication information obtaining unit, and the reference control indication information transmitting unit are located at the base station; wherein,
the actual downlink rank value acquisition unit includes:
the second preset subunit is used for presetting an actual downlink rank value by the base station;
a second notification subunit, configured to notify, by the base station, the user of the actual downlink rank value;
the control indication information analysis unit is positioned at the user side; and,
the power distribution information table presetting unit is respectively positioned at the base station end and the user end.
17. A base station for a multiple-user multiple-input multiple-output system, the base station comprising:
power allocation information table presetting unit: the power distribution information table comprises a plurality of reference downlink rank values, a plurality of reference control indication information and a reference power value corresponding to each reference downlink rank value and each reference control indication information;
a power allocation value obtaining unit, configured to obtain a power allocation value of each user in the system;
the base station side actual downlink rank value acquisition unit is used for acquiring actual downlink rank values shared by the base station and each user and sending the actual downlink rank values to corresponding users; or, the method is used for receiving an actual downlink rank value sent by a user;
a power distribution information searching unit, configured to search, according to the power distribution value and an actual downlink rank value, a reference power value matching the power distribution value in the power distribution information table;
and a reference control indication information sending unit, configured to send the reference control indication information corresponding to the matched reference power value to a corresponding user.
18. A base station for a multiple-user multiple-input multiple-output system, the base station comprising:
power allocation information table presetting unit: the power distribution information table comprises a plurality of reference downlink rank values, a plurality of reference control indication information and a reference power value corresponding to each reference downlink rank value and each reference control indication information;
the user scheduling unit is used for acquiring the scheduled users in the system;
a base station side actual downlink rank value obtaining unit, configured to obtain an actual downlink rank value shared by the base station and the scheduled user, and send the actual downlink rank value to a corresponding user; or, the method is used for receiving an actual downlink rank value sent by a user;
a user combination unit, configured to perform power distribution combination on the scheduled users according to multiple reference power values corresponding to actual downlink rank values in the power distribution information table;
an overall performance gain calculation unit for calculating an overall performance gain of the combination of power allocations and selecting the combination of power allocations with the greatest overall performance gain;
a reference control indication information obtaining unit, configured to determine, according to the power allocation information table, reference control indication information corresponding to the scheduled user in the power allocation combination;
and the reference control indication information sending unit is used for sending the reference control indication information to a corresponding user.
19. A user terminal for a multiple-user multiple-input multiple-output system, the user terminal comprising:
power allocation information table presetting unit: the power distribution information table comprises a plurality of reference downlink rank values, a plurality of reference control indication information and a reference power value corresponding to each reference downlink rank value and each reference control indication information;
a user side actual downlink rank value obtaining unit, configured to obtain an actual downlink rank value shared by a base station and the scheduled user, and send the actual downlink rank value to a corresponding base station; or, the base station is configured to receive an actual downlink rank value sent by the base station;
the control indication information analysis unit is used for searching and obtaining a corresponding reference power value in the power distribution information table according to the reference control indication information and the actual downlink rank value sent by the base station; wherein,
the reference control indication information sent by the base station is as follows: according to the power distribution value and the actual downlink rank value, control indication information corresponding to the reference power value matched with the power distribution value is searched in the power distribution information table;
the power distribution value is the power distribution value of each user in the system, which is acquired by the base station.
20. A user terminal for a multiple-user multiple-input multiple-output system, the user terminal comprising:
power allocation information table presetting unit: the power distribution information table comprises a plurality of reference downlink rank values, a plurality of reference control indication information and a reference power value corresponding to each reference downlink rank value and each reference control indication information;
a user side actual downlink rank value obtaining unit, configured to obtain an actual downlink rank value shared by a base station and the scheduled user, and send the actual downlink rank value to a corresponding base station; or, the base station is configured to receive an actual downlink rank value sent by the base station;
the control indication information analysis unit is used for searching and obtaining a corresponding reference power value in the power distribution information table according to the reference control indication information and the actual downlink rank value sent by the base station; wherein,
the reference control indication information sent by the base station is as follows: control indication information which is determined according to the reference power value obtained by each user in the combination of the power distribution with the maximum overall performance gain and corresponds to the power distribution information table;
the combination of the power allocation with the maximum overall performance gain is as follows: and the base station performs power distribution combination on the scheduled users according to a plurality of reference power values corresponding to the actual downlink rank values in the power distribution information table, calculates the overall performance gain of the power distribution combination, and further obtains the power distribution combination with the maximum overall performance gain.
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| CN101145817A (en) * | 2006-09-14 | 2008-03-19 | 联想(北京)有限公司 | An allocation method and transmitter for space transmission power of multi-input and multi-output system |
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| CN101145817A (en) * | 2006-09-14 | 2008-03-19 | 联想(北京)有限公司 | An allocation method and transmitter for space transmission power of multi-input and multi-output system |
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