WO2013021281A2 - Method and apparatus for scheduling user equipment in cellular communication system - Google Patents
Method and apparatus for scheduling user equipment in cellular communication system Download PDFInfo
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- WO2013021281A2 WO2013021281A2 PCT/IB2012/001888 IB2012001888W WO2013021281A2 WO 2013021281 A2 WO2013021281 A2 WO 2013021281A2 IB 2012001888 W IB2012001888 W IB 2012001888W WO 2013021281 A2 WO2013021281 A2 WO 2013021281A2
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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
- H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
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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
- H04W16/16—Spectrum sharing arrangements between different networks for PBS [Private Base Station] arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
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Abstract
A method for scheduling a user equipment in a cellular communication system which is based on coordination multi-point joint transmission is provided, wherein the cellular communication system comprises a macro base station performing a first scheduling to serve a first user equipment set, and a micro base station performing a second scheduling to serve a second user equipment set, the method comprising: determining adjustment information based on the first scheduling and the second scheduling; and sending the adjustment information to the micro base station so as to adjust data to be transmitted to a user equipment in the second user equipment set.
Description
METHOD AND APPARATUS FOR SCHEDULING USER EQUIPMENT IN CELLULAR COMMUNICATION SYSTEM
FIELD OF THE INVENTION
[0001] The present invention relates to a communication field, and more particularly to a method and an apparatus for scheduling a user equipment in a cellular communication system which is based on coordination multi-point joint transmission.
BACKGROUND OF THE INVENTION
[0002] In a cellular communication system, a user equipment at the boundary of a cell generally suffers from signal interference from other cells due to a weak signal, and thereby causes a poor signal quality To meet the requirements of LTE-A in the system capacity, instantaneous peak data rate, frequency spectrum, cell-edge user throughput, and delay, etc., the Coordination Multi-Point (CoMP) technology has been proposed to improve the system performance.
[0003] Generally speaking, according to different data processing manners, the CoMP technology may be divided into two types, one is Coordinated Scheduling/Coordinated Beamforming (called CS/CB for short) technology and the other is Joint Transmission (called JT for short) technology.
[0004] At present, the CoMP technology is mainly applied to four scenarios. The CoMP technology applied to the first and second application scenarios has been discussed in the first phase of 3GPP for CoMP, while the CoMP technology applied to the third and fourth application scenarios is widely noticed and in discussion. The CoMP in the third and fourth application scenarios basically belongs to the inter-site CoMP, which has strict backhaul/synchronization/complexity requirements. If the JT CoMP technology is employed, it generally fails to meet these strict requirements, and thus the CS/CB CoMP technology is generally employed.
[0005] However, the CS/CB CoMP technology is generally adapted to the FDD system and is not adapted to the TDD system. Thus, there is a need for a solution which is adapted to both the FDD system and the TDD system and meets the strict requirements of the inter- site CoMP technology.
SUMMARY OF THE INVENTION
[0006] For the above problem, a solution for scheduling a user equipment in a Coordination Multi-Point (CoMP) Joint Transmission (JT) based cellular communication system is provided in the present invention. The solution may be adapted to both the FDD system and the TDD system, while meets the strict requirements of the inter- site CoMP technology
[0007] According to the first aspect of the present invention, there is provided a method for scheduling a user equipment in a cellular communication system which is based on coordination multi-point joint transmission, wherein the cellular communication system comprises a macro base station performing a first scheduling to serve a first user equipment set, and a micro base station performing a second scheduling to serve a second user equipment set. The method comprises: determining adjustment information based on the first scheduling and the second scheduling; and sending the adjustment information to the micro base station so as to adjust data to be transmitted to a user equipment in the second user equipment set.
[0008] According to the second aspect of the present invention, there is provided a method for scheduling a user equipment in a cellular communication system which is based on coordination multi-point joint transmission, wherein the cellular communication system comprises a macro base station performing a first scheduling to serve a first user equipment set, and a micro base station performing a second scheduling to serve a second user equipment set. The method comprises: receiving adjustment information from the macro base station, wherein the adjustment information is determined based on the first scheduling and the second scheduling; and adjusting data to be transmitted to a user equipment in the second user equipment set based on the adjustment information.
[0009] According to the third aspect of the present invention, there is provided an apparatus for scheduling a user equipment in a cellular communication system which is based on coordination multi-point joint transmission, wherein the cellular communication system comprises a macro base station performing a first scheduling to serve a first user equipment set, and a micro base station performing a second scheduling to serve a second user equipment set. The apparatus comprises: adjustment information determining means configured to determine adjustment information based
on the first scheduling and the second scheduling; and sending means configured to send the adjustment information to the micro base station so as to adjust data to be transmitted to a user equipment in the second user equipment set.
[0010] According to the fourth aspect of the present invention, there is provided an apparatus for scheduling a user equipment in a cellular communication system which is based on coordination multi-point joint transmission, wherein the cellular communication system comprises a macro base station performing a first scheduling to serve a first user equipment set, and a micro base station performing a second scheduling to serve a second user equipment set. The apparatus comprises: receiving means configured to receive adjustment information from the macro base station, wherein the adjustment information is determined based on the first scheduling and the second scheduling; and adjusting means configured to adjust data to be transmitted to a user equipment in the second user equipment set based on the adjustment information.
[0011] Other features and advantages of the present invention will be obvious by the following descriptions of preferred embodiments for explaining the principle of the present invention, in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Other objects and effects of the present invention will become clearer and more understandable by making references to the following description in conjunction with the accompanying drawings along with more comprehensive understanding of the present invention, in which:
[0013] FIG. 1 is a flowchart of a method for scheduling a user equipment in a cellular communication system which is based on coordination multi-point joint transmission, according to one embodiment of the present invention;
[0014] FIG. 2 is a flowchart of a method for scheduling a user equipment in a cellular communication system which is based on coordination multi-point joint transmission, according to another embodiment of the present invention;
[0015] FIG. 3 is a block diagram of an apparatus for scheduling a user equipment in a cellular communication system which is based on coordination multi-point joint transmission, according to one embodiment of the present invention;
[0016] FIG. 4 is a flowchart of a method for scheduling a user equipment in a
cellular communication system which is based on coordination multi-point joint transmission, according to one embodiment of the present invention;
[0017] FIG. 5 is a flowchart of a method for scheduling a user equipment in a cellular communication system which is based on coordination multi-point joint transmission, according to another embodiment of the present invention; and
[0018] FIG. 6 is a block diagram of an apparatus for scheduling a user equipment in a cellular communication system which is based on coordination multi-point joint transmission, according to one embodiment of the present invention.
[0019] In all of the accompanying drawings, the same reference signs represent having identical, similar or corresponding features or functions.
DETAILED DESCRIPTION OF EMBODIMENTS
[0020] More detailed description will be presented below to embodiments of the present invention by referring to the figures. It is to be understood that the figures and embodiments of the present invention are merely for illustration, rather than limiting the protection scope of the present invention.
[0021] The flowcharts and block diagrams in the figures illustrate the system, methods, as well as architecture, functions and operations executable by a computer program product according to various embodiments of the present invention. In this regard, each block in the flowcharts or block diagrams may represent a module, a program segment, or a part of code, which contains one or more executable instructions for performing specified logic functions. It should be noted that in some alternative implementations, functions indicated in blocks may occur in an order differing from the order as shown in the figures. For example, two blocks shown consecutively may be performed in parallel substantially or in an inverse order sometimes, which depends on the functions involved. It should be further noted that each block and a combination of blocks in the block diagrams or flowcharts may be implemented by a dedicated, hardware-based system for performing specified functions or operations or by a combination of dedicated hardware and computer instructions. It should be note that the accompanying drawings and embodiments of the present invention only perform an exemplary function, rather than limiting the protection scope of the present invention. In the following, the present invention will be described in more detail with reference to
the accompanying drawings.
[0022] In the present invention, the User Equipment (UE) may be various types of terminals, such as a mobile phone, a Personal Digital Assistant (PDA), a portable computer, etc.. The base station, for example, may be eNodeB or eNB, etc.. The macro base station, for example, may be Macro eNB, which, for example, may manage a Macro Cell. The micro base station, for example, may be Micro eNB or Pico eNB, which, for example, may manage a Micro Cell or Pico Cell.
[0023] It should be noted that although the present invention mainly uses the Pico eNB as an example of the micro base station, it is merely exemplary and any other appropriate examples may be used to implement the technical solution of the present invention.
[0024] The present invention mainly focuses on scheduling a user equipment in a cellular communication system which is based on coordination multi-point joint transmission in Release 11. In one embodiment according to the present invention, the micro base station only serves its own user equipment, for example, a Pico eNB only serves a Pico UE; the macro base station may serve its own user equipment and may also serve the user equipment of the micro base station, for example, a Macro eNB may serve a Macro UE and may also serve a Pico UE; and Intra-site macro CoMP may be carried out without affecting implementation of the solution of the present invention. In another embodiment according to the present invention, in addition to what described in the above embodiment, the macro cell does not change the resource scheduling result and the precoding layer number of the micro cell, and the macro cell may determine a Modulation and Coding Scheme (MCS) and/or a Demodulation Reference Signal (DMRS). In another embodiment according to the present invention, in addition to descriptions in connection with the above two embodiments, when the macro cell servers a corresponding user equipment (e.g. one or more Pico UEs) in the micro cell, the micro cell may adjust (e.g. rotate the phase) the data to be transmitted to the UE to achieve coherent combining of signals to achieve enhancement of data signals.
[0025] FIG. 1 is a flowchart of a method for scheduling a user equipment in a cellular communication system which is based on coordination multi-point joint transmission, according to one embodiment of the present invention. The embodiment illustrated by FIG. 1 may be performed by a macro base station in a cellular
communication system or by any other suitable devices available to those skilled in the art.
[0026] The cellular communication system in the embodiment illustrated by FIG. 1 comprises a macro base station performing a first scheduling to serve a first user equipment set, and a micro base station performing a second scheduling to serve a second user equipment set.
[0027] At step S 101, adjustment information is determined based on the first scheduling and the second scheduling, wherein the first scheduling is performed by the macro base station to serve the first user equipment set, and the second scheduling is performed by the micro base station to serve the second user equipment set.
[0028] In one embodiment according to the present invention, a first channel matrix and a first precoding matrix for a user equipment in the first user equipment set may be obtained based on a result of the first scheduling, and a second channel matrix and a second precoding matrix for a user equipment in the second user equipment set may be obtained based on a result of the second scheduling, and then the adjustment information may be determined based on the first precoding matrix, the first channel matrix, the second precoding matrix and the second channel matrix.
[0029] In another embodiment according to the present invention, the process of determining the adjustment information based on the first precoding matrix, the first channel matrix, the second precoding matrix and the second channel matrix may be implemented by steps of: selecting, from the first precoding matrix, a sub-precoding matrix corresponding to the second precoding matrix; selecting, from the first channel matrix, a sub-channel matrix corresponding to the second channel matrix; and calculating a phase adjustment matrix as the adjustment information based on the second precoding matrix, the second channel matrix, the sub-precoding matrix and the sub-channel matrix.
[0030] In one embodiment according to the present invention, the result of the second scheduling may comprise: Channel State Information (CSI) of channel(s) between the micro base station and the user equipments in the second user equipment set. The channel state information is information on the channel state between the receiver and the transmitter. The channel state information may comprise Channel Quality Indicator (CQI), Precoding Matrix Index (PMI), Rank Indicator (RI), etc..
Corresponding channel matrix and precoding matrix may be determined by utilizing various methods existing in the prior art and based on the channel state information.
[0031] In one embodiment according to the present invention, the result of the second scheduling may comprise one or more of the following:
· CSI of channel(s) between the micro base station and the user equipment(s) in the second user equipment set;
• serial number(s) of the user equipment(s) in the second user equipment set;
• precoding layer number(s) of the user equipment(s) in the second user equipment set;
· resource(s) allocated to the user equipment(s) in the second user equipment set; and
• Demodulation Reference Signal(s) (DMRS(s)).
[0032] According to one embodiment of the present invention, the precoding layer number of the user equipment may be determined by the macro base station; in this case, the result of the second scheduling may not comprise this content. According to one embodiment of the present invention, DMRS may also be determined by the macro base station; in this case, the result of the second scheduling may also not comprise it.
[0033] In one embodiment according to the present invention, the result of the second scheduling is received from the micro base station.
[0034] At step SI 02, the adjustment information is sent to the micro base station so as to adjust data to be transmitted to a user equipment in the second user equipment set.
[0035] According to one embodiment of the present invention, in addition to sending determined adjustment information to the micro base station, one or more of the following may also be send to the micro base station:
• a selected modulation and coding scheme; and
• data to be transmitted from the micro base station to the user equipment in the second user equipment set.
[0036] In one embodiment according to the present invention, the method for scheduling a user equipment in a cellular communication system which is based on coordination multi-point joint transmission may also select a user equipment to be
served from the first user equipment set and the second user equipment set based on the adjustment information, capacities of user equipments in the first user equipment set and capacities of user equipments in the second user equipment set.
[0037] In one embodiment according to the present invention, the process of selecting, from the first user equipment set and the second user equipment set, a user equipment to be served may be implemented by: obtaining adjusted capacities of the user equipments in the second user equipment set based on the adjustment information and the capacities of the user equipments in the second user equipment set; obtaining the capacities of the user equipments in the first user equipment set based on the first scheduling; and then selecting a user equipment to be served, based on the capacities of the user equipments in the first user equipment set and the adjusted capacities of the user equipments in the second user equipment set.
[0038] Then, the flow in FIG. 1 ends.
[0039] FIG. 2 is a flowchart of a method for scheduling a user equipment in a cellular communication system which is based on coordination multi-point joint transmission, according to another embodiment of the present invention. The embodiment illustrated by FIG. 2 may be performed by a macro base station in a cellular communication system or by any other appropriate devices available to those skilled in the art.
[0040] Similar to the embodiment as illustrated by FIG. 1, the cellular communication system in the embodiment illustrated by FIG. 2 also comprises a macro base station performing a first scheduling to serve a first user equipment set, and a micro base station performing a second scheduling to serve a second user equipment set.
[0041] At step S201, a first channel matrix and a first precoding matrix for user equipments in the first user equipment set are obtained based on a result of the first scheduling.
[0042] In this embodiment, the first scheduling is performed by the macro base station. By performing the first scheduling, the macro base station may, for example, know respective capacities of its user equipments (e.g. UE1, UE2, UE3, UE4 and UE5) and select one group of user equipments (e.g. select UE1 and UE2) from these user equipments for serving. The first scheduling may be implemented by various methods
known in the art. The group of user equipments that the macro base station serves by performing the first scheduling is called as the first user equipment set. In this example, the first user equipment set comprises two user equipments, i.e. UE1 and UE2, respectively.
[0043] By the first scheduling, the channel matrix and the precoding matrix of the channel between the macro base station and the user equipments it serves may be obtained by various existing means or methods. For example, the macro base station may obtain CSI of channel(s), and then obtain a channel matrix based on the CSI and may obtain a precoding matrix by utilizing conventional algorithms in the art. These conventional algorithms may be, for example, a SVD decomposition algorithm, a Zero Forcing (ZF) algorithm, a Block Diagonal (BD) algorithm, etc..
[0044] To be distinguished from the channel matrix and the precoding matrix obtained by the micro base station, the channel matrix and the precoding matrix for user equipment(s) in the first user equipment set obtained based on the result of the first scheduling are called as the first channel matrix and the first precoding matrix.
[0045] In the embodiment as illustrated by FIG. 2, it is assumed that there are 24 antennas in the macro base station which has 3 macro cells, each macro cell having 8 antennas. It is also assumed that the micro base station has 8 antennas. Additionally, it is assumed that the user equipment has 2 antennas. When the macro base station serves K UEs after performing the first scheduling, the first channel matrix is denoted as
Macro
2Kx24 ^ which is the channel matrix between K UEs served by the macro base station
Macro
W ( K
and 3 macro cells; and the first precoding matrix is denoted as -<"1 J , wherein k represents the kth UE in K UEs and represents the layer number of the kth UE.
[0046] At step S202, the result of the second scheduling is received from the micro base station.
[0047] The second scheduling is performed by the micro base station. By performing the second scheduling, the micro base station, for example, may know respective capacities of its user equipments (e.g. UE6, UE7, UE8, UE9 and UE10) and select one group of user equipments (e.g. select UE6 and UE7) from these user equipments for serving. The second scheduling may be implemented by various methods known in the art. The group of user equipments that the micro base station
serves by performing the second scheduling is called as the second user equipment set. In this example, the second user equipment set comprises two user equipments, i.e. UE6 and UE7, respectively.
[0048] Similar to the first scheduling, the CSI of the channel between the micro base station and the second user equipment set (i.e. the user equipments served by the micro base station) may be obtained by the second scheduling. In an embodiment according to the present invention, receiving a result of the second scheduling from the micro base station comprises receiving the CSI of the channel between the micro base station and the user equipments in the second user equipment set.
[0049] In another embodiment according to the present invention, the result of the second scheduling comprises at least one of the following may further be received from the micro base station: serial number(s) of user equipment(s) in the second user equipment set, the precoding layer number(s) of user equipment(s) in the second user equipment set, resource(s) allocated to user equipment(s) in the second user equipment set, and demodulation reference signal(s).
[0050] At step S203, a second channel matrix and a second precoding matrix for user equipments in the second user equipment set are obtained based on the result of the second scheduling.
[0051] As described above, a corresponding channel matrix may be obtained based on the CSI of the channel between the micro base station and the user equipment it serves; and then, a corresponding precoding matrix may be obtained by a conventional algorithm in the art.
[0052] To be distinguished from the channel matrix and the precoding matrix obtained by the macro base station, the channel matrix and the precoding matrix for user equipments in the second user equipment set obtained based on the result of the second scheduling are called as the second channel matrix and the second precoding matrix.
[0053] In the embodiment as illustrated by FIG. 2, it is assumed that the micro base station serves P UEs after performing the second scheduling, the channel matrix (i.e. the second channel matrix) between the P UEs and the micro base station is denoted w Pico as 2Px8 , and the second precoding matrix is denoted as ?=1 , wherein p represents the ρώ UE in the P UEs and Lp represents the layer number of the ρώ UE.
[0054] At step S204, a sub-precoding matrix corresponding to the second precoding matrix is selected from the first precoding matrix.
[0055] In the embodiment as illustrated by FIG. 2, a sub-precoding matrix corresponding to the second precoding matrix is selected from the first precoding
24x∑
matrix •-t-1 } . Thus, the selected sub-precoding matrix has the same dimension as the second precoding matrix, i.e. the number of lines and the number of columns thereof are equal respectively. In this embodiment, the sub-precoding matrix to be selected from
Macro Macro the first precoding matrix ^t=1 ' is •■p"i
[0056] At step S205, a sub-channel matrix corresponding to the second channel matrix is selected from the first channel matrix.
[0057] In the embodiment as illustrated by FIG. 2, a sub-channel matrix corresponding to the second channel matrix is selected from the first channel matrix H c™ 4 . Thus, the selected sub-channel matrix has the same dimension as the second channel matrix, i.e. the number of lines and the number of columns thereof are equal respectively. In this embodiment, the sub-channel matrix to be selected from the
j j Macro j_j Macro
first channel matrix 2Xx24 is Λ 2Ρχ24
[0058] At step S206, a phase adjustment matrix is calculated based on the second precoding matrix, the second channel matrix, the sub-precoding matrix and the sub-channel matrix.
[0059] In one embodiment according to the present invention, the phase adjustment matrix (denoted, for example, as ^ Adiust ) is a diagonal matrix, its diagonal
θι , θ2 ,..., θ p
elements are respectively denoted as p=l , and the phase adjustment matrix may be represented as
M AdiuS, =
[0060] Thus, at step S206, it is necessary to calculate each diagonal element in phase adjustment matrix. In an implementation, each diagonal element may be
calculated by:
0, = -! * angle C> ' # C> *) )
( 1 )
[0061] In Equation (1), "(:,s)" represents all line elements of the s column in the matrix; the symbol " ' " after H precoding represents conjugate transpose; and represents an operation for calculating an angle.
[0062] H7reco°ding and H 'pP2oding in Equation (1) may be calculated by Equations
(2) and (3):
macro Macro j Macro
" precoding ~ 2Px24 ' VV ( p
∑Lp
(2)
[0063] At step S207, adjustment information is sent to the micro base station.
[0064] At step S208, adjusted capacities of the user equipments in the second user equipment set are obtained based on the adjustment information and the capacities of the user equipments in the second user equipment set.
[0065] In one embodiment according to the present invention, it is assumed that the kth UE in the second user equipment set is scheduled by the macro base station,
Ck
then the capacity m+p of the user equipment in the second user equipment set during the scheduling may be calculated by:
[0066] In Equation (4), "f" represents an operation (e.g. logarithm, etc.) based on the knowledge or technology known in the art to obtain corresponding equipment capacities. Then, by subtracting from m+i'the capacity p of the kth UE during the second scheduling, the effective capacity of the kth UE when it is scheduled by both the macro base station and the micro base station may be obtained, that is:
[0067] In this embodiment, the adjusted capacity of the user equipment in the second user equipment set is the effect capacity Ck-
[0068] At step S209, capacities of the user equipments in the first user equipment set are obtained based on the first scheduling.
[0069] As described above, the first scheduling is performed by the macro base station. During the first scheduling, the capacities of the user equipments in the first user equipment set may be obtained by various methods existing in the art.
[0070] At step S210, a user equipments to be served is selected based on the capacities of the user equipments in the first user equipment set and the adjusted capacities of the user equipments in the second user equipment set.
[0071] Then, the flow in FIG. 2 ends .
[0072] FIG. 3 is a block diagram of an apparatus 300 for scheduling a user equipment in a cellular communication system which is based on coordination multi-point joint transmission, according to one embodiment of the present invention. The apparatus 300 as illustrated by FIG. 3 may be implemented in the macro base station in the cellular communication system or in any other appropriate devices available to those skilled in the art.
[0073] The cellular communication system in the embodiment as illustrated by FIG. 3 comprises a macro base station and a micro base station, wherein the macro base station performs a first scheduling to serve a first user equipment set and the micro base station performs a second scheduling to serve a second user equipment set.
[0074] In one embodiment according to the present invention, the apparatus 300 may comprise: adjustment information determining means 310 configured to determine adjustment information based on the first scheduling and the second scheduling; and sending means 320 configured to send the adjustment information to the micro base station so as to adjust data to be transmitted to a user equipment in the second user equipment set.
[0075] In one embodiment according to the present invention, the adjustment information determining means 310 may comprise: means configured to obtain, based on a result of the first scheduling, a first channel matrix and a first precoding matrix for a user equipment in the first user equipment set; means configured to obtain, based on a
result of the second scheduling, a second channel matrix and a second precoding matrix for a user equipment in the second user equipment set; and means configured to determine the adjustment information based on the first precoding matrix, the first channel matrix, the second precoding matrix and the second channel matrix.
[0076] In one embodiment according to the present invention, the means configured to determine the adjustment information based on the first precoding matrix, the first channel matrix, the second precoding matrix and the second channel matrix, comprised by the adjustment information determining means 310 may comprise: means configured to select, from the first precoding matrix, a sub-precoding matrix corresponding to the second precoding matrix; means configured to select, from the first channel matrix, a sub-channel matrix corresponding to the second channel matrix; and means configured to calculate a phase adjustment matrix as the adjustment information based on the second precoding matrix, the second channel matrix, the sub-precoding matrix and the sub-channel matrix.
[0077] In one embodiment according to the present invention, the apparatus
300 may further comprise: receiving means (not shown) configured to receive a result of the second scheduling from the micro base station. In one embodiment according to the present invention, the result of the second scheduling, for example, may comprise: channel state information of a channel between the micro base station and the user equipments in the second user equipment set. In another embodiment according to the present invention, the result of the second scheduling may further comprise at least one of the following: a serial number of the user equipment in the second user equipment set, a precoding layer number of the user equipment in the second user equipment set, resource allocated to the user equipment in the second user equipment set, and a demodulation reference signal.
[0078] In one embodiment according to the present invention, the apparatus 300 may further comprise: selecting means (not shown) configured to select a user equipment to be served from the first user equipment set and the second user equipment set, based on the adjustment information, capacities of user equipments in the first user equipment set and capacities of user equipments in the second user equipment set.
[0079] In one embodiment according to the present invention, the selecting means may comprise: means configured to obtain adjusted capacities of the user
equipments in the second user equipment set based on the adjustment information and the capacities of the user equipments in the second user equipment set; means configured to obtain the capacities of the user equipments in the first user equipment set based on the first scheduling; and means configured to select a user equipment to be served, based on the capacities of the user equipments in the first user equipment set and the adjusted capacities of the user equipments in the second user equipment set.
[0080] In one embodiment according to the present invention, the sending means 320 may further be configured to send to the micro base station at least one of the following: a selected modulation and coding scheme, and data to be transmitted from the micro base station to the user equipment in the second user equipment set.
[0081] FIG. 4 is a flowchart of a method for scheduling a user equipment in a cellular communication system which is based on coordination multi-point joint transmission, according to one embodiment of the present invention. The embodiment illustrated by FIG. 4 may be performed by a micro base station in a cellular communication system or by any other appropriate devices available to those skilled in the art.
[0082] The cellular communication system in the embodiment illustrated by FIG. 4 comprises a macro base station and a micro base station, wherein the macro base station performs a first scheduling to serve a first user equipment set, and the micro base station performs a second scheduling to serve a second user equipment set.
[0083] At step S401, adjustment information is received from the macro base station, wherein the adjustment information is determined based on the first scheduling and the second scheduling.
[0084] According to one embodiment of the present invention, the adjustment information determined at step S 101 may be received, and it may be determined by the macro base station or by any other appropriate devices.
[0085] According to one embodiment of the present invention, the adjustment information received at step S401 may be the phase adjustment matrix calculated at Steps S201-S206.
[0086] At step S402, the data to be transmitted to a user equipment in the second user equipment set is adjusted based on the adjustment information.
[0087] According to one embodiment of the present invention, Step S402 may
be implemented by: obtaining, based on a result of the second scheduling, a second channel matrix and a second precoding matrix for a user equipment in the second user equipment set; and adjusting data to be transmitted from the micro base station to the user equipments in the second user equipment set, based on the adjustment information, the second precoding matrix and the second channel matrix.
[0088] According to one embodiment of the present invention, before Step S401, a result of the second scheduling may also be sent to the macro base station. The result of the second scheduling, for example, may comprise: CSI of channel(s) between the micro base station and the user equipment(s) in the second user equipment set.
[0089] According to another embodiment of the present invention, the result of the second scheduling may comprise one or more of the following:
• CSI of channel(s) between the micro base station and the user equipment(s) in the second user equipment set;
· serial number(s) of the user equipment(s) in the second user equipment set;
• precoding layer number(s) of the user equipment(s) in the second user equipment set;
• resource(s) allocated to the user equipment(s) in the second user equipment set; and
· Demodulation Reference Signal(s) (DMRS(s)).
[0090] According to one embodiment of the present invention, in addition to the adjustment information received at step S401, one or more of the following may also be received from the macro base station:
• a selected modulation and coding scheme; and
· data to be transmitted from the micro base station to the user equipment(s) in the second user equipment set
[0091] Then, the flow in FIG. 4 ends .
[0092] FIG. 5 is a flowchart of a method for scheduling a user equipment in a cellular communication system which is based on coordination multi-point joint transmission, according to another embodiment of the present invention. The embodiment illustrated by FIG. 5 may be performed by a micro base station in a cellular communication system or by any other appropriate devices available to those skilled in
the art.
[0093] Similar to the embodiment as illustrated by FIG. 4, the cellular communication system in the embodiment illustrated by FIG. 5 also comprises a macro base station performing a first scheduling to serve a first user equipment set, and a micro base station performing a second scheduling to serve a second user equipment set.
[0094] At step S501, a result of the second scheduling is sent to the macro base station.
[0095] It is to be noted that Step S501 is optional.
[0096] In one embodiment according to the present invention, the second scheduling is performed by the micro base station. By performing the second scheduling, the micro base station, for example, may know respective capacities of its own user equipments (e.g. UE6, UE7, UE8, UE9 and UE10) and select a group of user equipments (e.g. UE6 and UE7) from these user equipments for serving. The second scheduling may be implemented in various ways known in the art. The group of user equipments that the micro base station serves by performing the second scheduling is called as the second user equipment set. In this example, the second user equipment set comprises two user equipments, i.e. UE6 and UE7.
[0097] A result of second scheduling, e.g. CSI of channels between the micro base station and the second user equipment set (i.e. the user equipments served by the micro base station), may be obtained based on the second scheduling. In one embodiment according to the present invention, sending to the macro base station a result of the second scheduling comprises sending CSI of channel(s) between the micro base station and the user equipment(s) in the second user equipment set.
[0098] In another embodiment according to the present invention, the result of the second scheduling comprising at least one of the following may also be sent to the macro base station: a serial number of the user equipment in the second user equipment set, a precoding layer number of the user equipment in the second user equipment set, resource allocated to the user equipment in the second user equipment set, and a demodulation reference signal.
[0099] At step S502, adjustment information is received from the macro base station.
[00100] Similar to Step S401, the adjustment information may be determined based on the first scheduling and the second scheduling.
[00101] According to one embodiment of the present invention, the adjustment information determined at step S 101 may be received, and it may be determined by the macro base station or by any other appropriate devices.
[00102] According to one embodiment of the present invention, the adjustment information received at step S401 may be the phase adjustment matrix calculated at Steps S201-S206.
[00103] At step S503, a second channel matrix and a second precoding matrix for user equipments in the second user equipment set are obtained based on a result of the second scheduling.
[00104] This step is similar to Step S203. In this embodiment, the second scheduling is performed by the micro base station. By performing the second scheduling, the micro base station may know, e.g., respective capacities of its user equipments and select one group of user equipments from these user equipments for serving. The second scheduling may be implemented by various methods known in the art. The group of user equipments that the micro base station serves by performing the second scheduling is called as the second user equipment set.
[00105] By the second scheduling, the channel matrix and the precoding matrix of the channel between the micro base station and the user equipments it serves may be obtained by various prior arts or methods. For example, the micro base station may obtain CSI of channel(s), and then obtain a channel matrix based on the CSI and may obtain a precoding matrix by conventional algorithms in the art. These conventional algorithms may be, for example, a SVD decomposition algorithm, a Zero Forcing (ZF) algorithm, a Block Diagonal (BD) algorithm, etc..
[00106] To be distinguished from the channel matrix and the precoding matrix obtained by the macro base station, the channel matrix and the precoding matrix for user equipments in the second user equipment set obtained based on the result of the second scheduling are called as the second channel matrix and the second precoding matrix.
[00107] At step S504, data to be transmitted from the micro base station to the user equipments in the second user equipment set are adjusted based on the adjustment information, the second precoding matrix and the second channel matrix.
[00108] In this embodiment, the same scenario as the embodiment illustrated by FIG. 2 is assumed. It is assumed that there are 24 antennas in the macro base station which has 3 macro cells, each macro cell having 8 antennas. It is also assumed that the micro base station has 8 antennas. Additionally, it is assumed that the user equipment has 2 antennas. The micro base station is assumed to serve P UEs after performing the second scheduling, the channel matrix (i.e. the second channel matrix) between the P
UEs and the micro base station is denoted as H x°8 , and the second precoding matrix is denoted as WPlc P° , wherein p represents the ρώ UE in P UEs and Lp represents the layer number of the ρώ UE.
[00109] In addition, assuming that the data to be transmitted from the micro base station to the user equipments in the second user equipment set is S, and that the adjustment information received at step S502 is assumed to be M Adjust , the data S may be adjusted based on the adjustment information, the second precoding matrix and the second channel matrix by Equation (6):
SAdmst = ? - WF2
[00110] At step S505, the adjusted data are transmitted to the user equipments.
[00111] Then, the flow in FIG. 5 ends.
[00112] FIG. 6 is a block diagram of an apparatus 600 for scheduling a user equipment in a cellular communication system which is based on coordination multi-point joint transmission, according to one embodiment of the present invention. The apparatus 600 as illustrated by FIG. 6 may be implemented in the micro base station in a cellular communication system or in any other appropriate devices available to those skilled in the art.
[00113] The cellular communication system in the embodiment as illustrated by FIG. 6 comprises a macro base station performing a first scheduling to serve a first user equipment set, and a micro base station performing a second scheduling to serve a second user equipment set.
[00114] In one embodiment according to the present invention, the apparatus 600 may comprise: receiving means 610 configured to receive adjustment information
from the macro base station, wherein the adjustment information is determined based on the first scheduling and the second scheduling; and adjusting means 620 configured to adjust data to be transmitted to a user equipment in the second user equipment set based on the adjustment information.
[00115] In one embodiment according to the present invention, the adjusting means 620 may comprise: means configured to obtain, based on a result of the second scheduling, a second channel matrix and a second precoding matrix for a user equipment in the second user equipment set; and means configured to adjust data to be transmitted from the micro base station to the user equipments in the second user equipment set, based on the adjustment information, the second precoding matrix and the second channel matrix.
[00116] In one embodiment according to the present invention, the apparatus 600 may further comprise: sending means (not shown) configured to send a result of the second scheduling to the macro base station before receiving the adjustment information from the macro base station. In one embodiment according to the present invention, the result of the second scheduling may comprise: channel state information of a channel between the micro base station and the user equipment in the second user equipment set. In one embodiment according to the present invention, the result of the second scheduling may further comprise at least one of the following: a serial number of the user equipment in the second user equipment set, a precoding layer number of the user equipment in the second user equipment set, resource allocated to the user equipment in the second user equipment set, and a demodulation reference signal.
[00117] In one embodiment according to the present invention, the receiving means 610 may be further configured to receive, from the macro base station, at least one of the following: a selected modulation and coding scheme, and data to be transmitted from the micro base station to the user equipment in the second user equipment set.
[00118] By the method and apparatus for scheduling a user equipment in a cellular communication system which is based on coordination multi-point joint transmission according to the present invention, user equipment scheduling that is adapted to both the FDD system and the TDD system in Release 11 and meets the strict requirements of the inter- site CoMP technology may be implemented.
[00119] The method disclosed by embodiments of the present invention may be implemented in software, hardware or a combination of software and hardware. The hardware portion may be implemented by a dedicated logic; the software portion may be stored in a memory and be performed by an appropriate instruction executing system, e.g. a microprocessor, a Personal Computer (PC) or a mainframe. In a preferred embodiment, the present invention is implemented as software, including, without limitation to, firmware, resident software, micro-code, etc.
[00120] Moreover, embodiments of the present invention may be implemented as a computer program product usable from computers or accessible by computer-readable media that provide program code for use by or in connection with a computer or any instruction executing system. For the purpose of description, a computer-usable or computer-readable medium may be any tangible means that can contain, store, communicate, propagate, or transport the program for use by or in connection with an instruction execution system, apparatus, or device.
[00121] The medium may be an electric, magnetic, optical, electromagnetic, infrared, or semiconductor system (apparatus or device), or propagation medium. Examples of the computer-readable medium would include the following: a semiconductor or solid storage device, a magnetic tape, a portable computer diskette, a random access memory (RAM), a read-only memory (ROM), a hard disk, and an optical disk. Examples of the current optical disk include a compact disk read-only memory (CD-ROM), compact disk-read/write (CR-R/M), and DVD.
[00122] A system adapted for storing or executing program codes according to embodiments of the present invention would include at least one processor that is coupled to a storage element directly or via a system bus. The storage element may include a local memory usable during actually executing the program code, a mass memory, and a cache that provides temporary storage for at least one portion of program code so as to decrease the number of times for retrieving code from the mass memory during execution.
[00123] An input/output or I/O device (including, without limitation to, a keyboard, a display, a pointing device, etc.) may be coupled to the system directly or via an intermediate I/O controller.
[00124] A network adapter may also be coupled to the system such that the
system can be coupled to other systems, remote printers or storage devices via an intermediate private or public network. A modem, a cable modem, and an Ethernet card are merely examples of a currently usable network adapter.
[00125] It should be noted that for facilitating understanding of embodiments of the present invention, some more specific technical details that are well-known to those skilled in the art and may be necessary for implementing the embodiments of the present invention are omitted in the above descriptions.
[00126] The specification of the present invention is provided for explanation and description purposes, rather than exhausting or limiting the present invention as the disclosed form. For those of ordinary skill in the art, many modifications and variations are available.
[00127] Thus, selecting and describing the embodiments is to better explain the principle of the actual application of the present invention, and to enable those of ordinary skill in the art to understand that, without departure from the essence of the present invention, all modifications and changes fall into the protection scope of the present invention defined by the claims.
Claims
1. A method for scheduling a user equipment in a cellular communication system which is based on coordination multi-point joint transmission, wherein the cellular communication system comprises a macro base station performing a first scheduling to serve a first user equipment set, and a micro base station performing a second scheduling to serve a second user equipment set, the method comprising:
determining adjustment information based on the first scheduling and the second scheduling; and
sending the adjustment information to the micro base station so as to adjust data to be transmitted to a user equipment in the second user equipment set.
2. The method according to claim 1, wherein determining adjustment information based on the first scheduling and the second scheduling comprises:
obtaining, based on a result of the first scheduling, a first channel matrix and a first precoding matrix for a user equipment in the first user equipment set;
obtaining, based on a result of the second scheduling, a second channel matrix and a second precoding matrix for a user equipment in the second user equipment set; and determining the adjustment information based on the first precoding matrix, the first channel matrix, the second precoding matrix and the second channel matrix.
3. The method according to claim 2, wherein determining the adjustment information based on the first precoding matrix, the first channel matrix, the second precoding matrix and the second channel matrix comprises:
selecting, from the first precoding matrix, a sub-precoding matrix corresponding to the second precoding matrix;
selecting, from the first channel matrix, a sub-channel matrix corresponding to the second channel matrix; and
calculating a phase adjustment matrix as the adjustment information, based on the second precoding matrix, the second channel matrix, the sub-precoding matrix and the sub-channel matrix.
4. The method according to claim 1, further comprising:
receiving a result of the second scheduling from the micro base station, wherein the result of the second scheduling comprises: channel state information of a channel between the micro base station and the user equipment in the second user equipment set.
5. The method according to claim 4, wherein the result of the second scheduling further comprises at least one of the following: a serial number of the user equipment in the second user equipment set, a precoding layer number of the user equipment in the second user equipment set, resource allocated to the user equipment in the second user equipment set, and a demodulation reference signal.
6. The method according to claim 1, further comprising:
selecting a user equipment to be served from the first user equipment set and the second user equipment set, based on the adjustment information, capacities of user equipments in the first user equipment set and capacities of user equipments in the second user equipment set.
7. The method according to claim 6, wherein selecting a user equipment to be served from the first user equipment set and the second user equipment set, based on the adjustment information, capacities of user equipments in the first user equipment set and capacities of user equipments in the second user equipment set comprises:
obtaining adjusted capacities of the user equipments in the second user equipment set based on the adjustment information and the capacities of the user equipments in the second user equipment set;
obtaining the capacities of the user equipments in the first user equipment set based on the first scheduling; and
selecting a user equipment to be served, based on the capacities of the user equipments in the first user equipment set and the adjusted capacities of the user equipments in the second user equipment set.
8. The method according to claim 1, further comprising: sending to the micro base station at least one of the following: a selected modulation and coding scheme, and data to be transmitted from the micro base station to the user equipment in the second user equipment set.
9. A method for scheduling a user equipment in a cellular communication system which is based on coordination multi-point joint transmission, wherein the cellular communication system comprises a macro base station performing a first scheduling to serve a first user equipment set, and a micro base station performing a second scheduling to serve a second user equipment set, the method comprising:
receiving adjustment information from the macro base station, wherein the adjustment information is determined based on the first scheduling and the second scheduling; and
adjusting data to be transmitted to a user equipment in the second user equipment set based on the adjustment information.
10. The method according to claim 9, wherein adjusting data to be transmitted to a user equipment in the second user equipment set based on the adjustment information comprises:
obtaining, based on a result of the second scheduling, a second channel matrix and a second precoding matrix for a user equipment in the second user equipment set; and adjusting data to be transmitted from the micro base station to the user equipment in the second user equipment set, based on the adjustment information, the second precoding matrix and the second channel matrix.
11. The method according to claim 9, before receiving adjustment information from the macro base station, further comprising:
sending to the macro base station a result of the second scheduling, wherein the result of the second scheduling comprises: channel state information of a channel between the micro base station and the user equipment in the second user equipment set.
12. The method according to claim 11, wherein the result of the second scheduling further comprises at least one of the following: a serial number of the user equipment in the second user equipment set, a precoding layer number of the user equipment in the second user equipment set, resource allocated to the user equipment in the second user equipment set, and a demodulation reference signal.
13. The method according to claim 9, further comprising:
receiving, from the macro base station, at least one of the following: a selected modulation and coding scheme, and data to be transmitted from the micro base station to the user equipment in the second user equipment set.
14. An apparatus for scheduling a user equipment in a cellular communication system which is based on coordination multi-point joint transmission, wherein the cellular communication system comprises a macro base station performing a first scheduling to serve a first user equipment set, and a micro base station performing a second scheduling to serve a second user equipment set, the apparatus comprising: adjustment information determining means configured to determine adjustment information based on the first scheduling and the second scheduling; and
sending means configured to send the adjustment information to the micro base station so as to adjust data to be transmitted to a user equipment in the second user equipment set.
15. The apparatus according to claim 14, wherein the adjustment information determining means comprises:
means configured to obtain, based on a result of the first scheduling, a first channel matrix and a first precoding matrix for a user equipment in the first user equipment set; means configured to obtain, based on a result of the second scheduling, a second channel matrix and a second precoding matrix for a user equipment in the second user equipment set; and
means configured to determine the adjustment information based on the first precoding matrix, the first channel matrix, the second precoding matrix and the second channel matrix.
16. The apparatus according to claim 15, wherein the means configured to determine the adjustment information based on the first precoding matrix, the first channel matrix, the second precoding matrix and the second channel matrix comprises: means configured to select, from the first precoding matrix, a sub-precoding matrix corresponding to the second precoding matrix;
means configured to select, from the first channel matrix, a sub-channel matrix corresponding to the second channel matrix; and
means configured to calculate a phase adjustment matrix as the adjustment information, based on the second precoding matrix, the second channel matrix, the sub-precoding matrix and the sub-channel matrix.
17. The apparatus according to claim 14, further comprising:
receiving means configured to receive a result of the second scheduling from the micro base station, wherein the result of the second scheduling comprises: channel state information of a channel between the micro base station and the user equipment in the second user equipment set.
18. The apparatus according to claim 17, wherein the result of the second scheduling further comprises at least one of the following: a serial number of the user equipment in the second user equipment set, a precoding layer number of the user equipment in the second user equipment set, resource allocated to the user equipment in the second user equipment set, and a demodulation reference signal.
19. The apparatus according to claim 14, further comprising:
selecting means configured to select a user equipment to be served from the first user equipment set and the second user equipment set, based on the adjustment information, capacities of user equipments in the first user equipment set and capacities of user equipments in the second user equipment set.
20. The apparatus according to claim 19, wherein the selecting means comprises: means configured to obtain adjusted capacities of the user equipments in the second user equipment set based on the adjustment information and the capacities of the user equipments in the second user equipment set; means configured to obtain the capacities of the user equipments in the first user equipment set based on the first scheduling; and
means configured to select a user equipment to be served, based on the capacities of the user equipments in the first user equipment set and the adjusted capacities of the user equipments in the second user equipment set.
21. The apparatus according to claim 14, wherein the sending means is further configured to send to the micro base station at least one of the following: a selected modulation and coding scheme, and data to be transmitted from the micro base station to the user equipment in the second user equipment set.
22. An apparatus for scheduling a user equipment in a cellular communication system which is based on coordination multi-point joint transmission, wherein the cellular communication system comprises a macro base station performing a first scheduling to serve a first user equipment set, and a micro base station performing a second scheduling to serve a second user equipment set, the apparatus comprising: receiving means configured to receive adjustment information from the macro base station, wherein the adjustment information is determined based on the first scheduling and the second scheduling; and
adjusting means configured to adjust data to be transmitted to a user equipment in the second user equipment set based on the adjustment information.
23. The apparatus according to claim 22, wherein the adjusting means comprises: means configured to obtain, based on a result of the second scheduling, a second channel matrix and a second precoding matrix for a user equipment in the second user equipment set; and
means configured to adjust data to be transmitted from the micro base station to the user equipments in the second user equipment set, based on the adjustment information, the second precoding matrix and the second channel matrix.
24. The apparatus according to claim 22, further comprising:
sending means configured to send a result of the second scheduling to the macro base station before receiving the adjustment information from the macro base station, wherein the result of the second scheduling comprises: channel state information of a channel between the micro base station and the user equipment in the second user equipment set.
25. The apparatus according to claim 24, wherein the result of the second scheduling further comprises at least one of the following: a serial number of the user equipment in the second user equipment set, a precoding layer number of the user equipment in the second user equipment set, resource allocated to the user equipment in the second user equipment set, and a demodulation reference signal.
26. The apparatus according to claim 22, wherein the receiving means is further configured to:
receive, from the macro base station, at least one of the following: a selected modulation and coding scheme, and data to be transmitted from the micro base station to the user equipment in the second user equipment set.
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| CN201110230272.7A CN102932937B (en) | 2011-08-11 | 2011-08-11 | Method for dispatching user facility in cellular communication system and equipment |
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| CN106031266B (en) * | 2014-04-02 | 2020-02-14 | 上海诺基亚贝尔股份有限公司 | Low-complexity multi-cell downlink coherent joint transmission method and device |
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| WO2010068769A1 (en) * | 2008-12-10 | 2010-06-17 | Qualcomm Incorporated | LIST ELIMINATION FOR DISTRIBUTED DOWNLINK COORDINATED MULTI-POINT (CoMP) FRAMEWORK |
| WO2010124033A2 (en) * | 2009-04-21 | 2010-10-28 | Qualcomm Incorporated | Pre-communiction for relay base stations in wireless communication |
| CN102132597A (en) * | 2008-08-28 | 2011-07-20 | 高通股份有限公司 | Distributed downlink coordinated multi-point (comp) framework |
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| US20060056350A1 (en) * | 2004-09-16 | 2006-03-16 | Love Robert T | Method and apparatus for uplink communication in a cellular communication system |
| US8238297B2 (en) * | 2007-07-31 | 2012-08-07 | Samsung Electronics Co., Ltd | Method and system for dimensioning scheduling assignments in a communication system |
| WO2009041883A1 (en) * | 2007-09-26 | 2009-04-02 | Telefonaktiebolaget L M Ericsson (Publ) | Improved uplink scheduling in a cellular system |
| US20100111070A1 (en) * | 2008-11-01 | 2010-05-06 | Broadband Wireless Technology Corp. | Apparatus, Method, And Tangible Machine-Readable Medium Thereof For Time Synchronization Procedure In A Cellular Network |
| CN101841496B (en) * | 2009-03-17 | 2013-03-13 | 上海贝尔股份有限公司 | Multi-cell cooperative communication method and device in multi-input multi-output system |
| KR20110049623A (en) * | 2009-11-04 | 2011-05-12 | 엘지전자 주식회사 | Method of uplink coodintion in mobile communications system and terminal thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102132597A (en) * | 2008-08-28 | 2011-07-20 | 高通股份有限公司 | Distributed downlink coordinated multi-point (comp) framework |
| WO2010068769A1 (en) * | 2008-12-10 | 2010-06-17 | Qualcomm Incorporated | LIST ELIMINATION FOR DISTRIBUTED DOWNLINK COORDINATED MULTI-POINT (CoMP) FRAMEWORK |
| WO2010124033A2 (en) * | 2009-04-21 | 2010-10-28 | Qualcomm Incorporated | Pre-communiction for relay base stations in wireless communication |
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| WO2013021281A3 (en) | 2013-05-02 |
| TWI452921B (en) | 2014-09-11 |
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