CN101405973B - Wireless access network and method for allocating time and frequency resources - Google Patents
Wireless access network and method for allocating time and frequency resources Download PDFInfo
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Abstract
Embodiments of a wireless access network and method for allocation of time and frequency resources are generally described herein. Other embodiments may be described and claimed. In some embodiments, a base station allocates data subcarriers of contiguous groups of a downlink subframe to closed-loop user stations, and allocates the remaining data subcarriers of the downlink subframe to open-loop user stations to increase frequency diversity.
Description
Technical field
Some embodiments of the present invention relate to wireless access network.Some embodiments of the present invention relate to multi-carrier communication.
Background technology
Some wireless access networks such as broadband wireless access (BWA) net and OFDM (OFDMA) net utilize a plurality of independent frequency subcarriers to communicate.In some wireless access networks, several subscriber stations are given with these sub-carrier allocation in the base station.The problem that subcarrier allocation technique will solve comprises the maximizing performance of each subscriber station and effectively utilizes bandwidth.
Therefore, generally need to be used for the time of allocation of communication channels and wireless access network and the method for frequency resource.General also the needs to help when effectively utilizing channel width the time that is used for allocation of communication channels of the maximizing performance of subscriber station and wireless access network and the method for frequency resource.
Description of drawings
Fig. 1 is the functional block diagram according to the wireless access network of some embodiments of the present invention;
The T/F that Fig. 2 illustrates according to the part of the downlink subframe of some embodiments of the present invention distributes;
Fig. 3 illustrates according to the subcarrier spacing of some embodiments of the present invention and spacing deviation;
Fig. 4 A is illustrated in the downlink subframe in the situation about subcarrier not being renumberd;
Fig. 4 B illustrates the downlink subframe that cyclic shift renumbers subcarrier that has according to some embodiments of the present invention; And
Fig. 4 C illustrates and according to some embodiments of the present invention subcarrier is carried out oppositely the alternately downlink subframe of numbering.
Embodiment
The following description and drawings are enough to illustrate that specific embodiments of the invention are to enable those skilled in the art to realize them.Other embodiment can comprise structure, logic, electricity, process and other variation.Example just represents possible modification.Unless explicitly call for, otherwise each assembly and function are optional, and operating sequence can change.Some parts of some embodiment and feature can be included in some parts of other embodiment and the feature or substitute some parts and the feature of other embodiment.All available equipollents of containing those claims such as the embodiments of the invention of setting forth in the claim.This paper can be called embodiments of the invention separately or be referred to as term " invention ", this is for convenience's sake, rather than is used for the application's scope is limited to any single invention or innovation concept (if in fact disclosing more than an invention or innovation concept).
Fig. 1 is the functional block diagram according to the wireless access network of some embodiments of the present invention.In wireless access network 100, closed-loop user station 104 and pf open-loop user stations 106 can be distributed to the T/F unit of downlink subframe 103 in base station 102.In certain embodiments, closed-loop user station 104 can be distributed to the data subcarriers (contiguous groups ofdata subcarriers) of the contiguous set of downlink subframe 103 in base station 102, and with the remaining data sub-carrier allocation of downlink subframe 103 to pf open-loop user stations 106 to increase frequency diversity.
In certain embodiments, base station 102 can comprise the T/F unit allocator (TFUA) 110 that can carry out these distribution.T/F unit allocator 110 can comprise the combination of software or hardware, firmware and software.Each embodiment of the batch operation of T/F unit allocator 110 will discuss hereinafter in more detail.
The T/F that Fig. 2 illustrates according to the part of the downlink subframe of some embodiments of the present invention distributes.Downlink subframe 103 can be corresponding to downlink subframe 103 (Fig. 1).Downlink subframe 103 comprises T/F unit 201, and these T/F unit 201 can comprise by one or more subcarriers of frequency and meta-unit 205 during by time one or more.See figures.1.and.2 simultaneously, according to some embodiment, closed-loop user station 104 is distributed to (namely with the data subcarriers of the contiguous set 204 of downlink subframe 103 in base station 102, the frequency diversity that reduces), and the remaining data subcarrier 206 of downlink subframe 103 distributed to pf open-loop user stations 106 (that is, the frequency diversity of increase).
In Fig. 2, the digital 1-5 that illustrates in T/F unit 201 can corresponding to specific pf open-loop user stations 106, can be assigned to this specific T/F unit 201 this specific pf open-loop user stations 106.For the sake of simplicity, among Fig. 2 downlink subframe 103 is shown and only has 8 subcarriers (by frequency), but actual realization can comprise nearly 100 or more subcarrier.
Closed-loop user station 104 was distributed to the data subcarriers of contiguous set 204 in meta-unit 205 when in certain embodiments, base station 102 can be in the downlink subframe 103 each.Each pf open-loop user stations 106 was distributed to remaining noncontiguous data subcarrier (remaining data subcarriers non-contiguously) 206 in meta-unit 205 when base station 102 also can be in the downlink subframe 103 each.In these embodiments, for each pf open-loop user stations 106, can be with time diversity and frequency diversity maximization.
In certain embodiments, wireless access network 100 can be OFDM (OFDMA) net, and each the time meta-unit 205 can comprise the OFDMA symbol.Closed-loop user station 104 can be distributed to the data subcarriers of identical contiguous set 204 for a plurality of OFDMA symbols in base station 102.Pf open-loop user stations 106 can be distributed to the different data subcarriers in the remaining data subcarrier 206 for each OFDMA symbol in base station 102.In these embodiments, can be for downlink subframe 103 more than an OFDMA symbol or all OFDMA symbols the data subcarriers of identical contiguous set 204 is distributed to closed-loop user station 104.Among some 3GPP LTE embodiment that will discuss hereinafter, a downlink subframe can have 6 or 7 OFDMA symbols, but scope of the present invention is unrestricted in this regard.In some alternatives, can for downlink subframe 103 more than an OFDMA symbol or all OFDMA symbols identical remaining data subcarrier 206 is distributed to pf open-loop user stations 106, but scope of the present invention is unrestricted in this regard.
The closed-loop user station 104 of the advantage data subcarriers of contiguous set 204 is distributed to to(for) a plurality of OFDMA symbols is, changes and can change greater than channel response in time with the channel response of frequency.To reduce expense for a plurality of OFDMA symbols rather than another advantage of on each symbolic base, the data subcarriers of contiguous set 204 being distributed to closed-loop user station 104.In other words, can provide the T/F that distributes piece in narrower frequency span and the wider time interval.On the other hand, for pf open-loop user stations 206, may need to increase frequency diversity so that distribute to the subcarrier of pf open-loop user stations 106 and can be distributed in widely (that is, larger frequency span) in the frequency.
In certain embodiments, closed-loop user station 104 can be distributed to the data subcarriers of contiguous set 204 in meta-unit 205 during for each before remaining data subcarrier 206 is distributed to pf open-loop user stations 106.In these embodiments, in each meta-unit 205 subsequently, after at first the data subcarriers of contiguous set 204 being distributed to closed-loop user station 104, remaining data subcarrier 206 can be redistributed to pf open-loop user stations 106.
In certain embodiments, pf open-loop user stations 106 can be distributed to remaining data subcarrier 206 by the following method in base station 102: remaining contiguous data subcarriers sequential system is divided (systematically partition) become a plurality of subsequences; And on the basis of each sequence will with described a plurality of sequences in the data subcarriers of a serial correlation distribute to pf open-loop user stations 106.These embodiment will discuss hereinafter in more detail.In certain embodiments, described a plurality of subsequence can be chosen as and have different length.In other embodiments, described a plurality of subsequence can be chosen as and have identical length.Have among these embodiment of a plurality of subsequences of identical or different length in utilization, remaining data subcarrier 206 can be mingled in the pf open-loop user stations 106, this can help frequency diversity and time diversity maximization.
In certain embodiments, base station 102 can be by redistributing remaining data subcarrier 206 cyclic shifts to pf open-loop user stations 106 with the remaining data subcarrier 206 of downlink subframe 103 for each or a plurality of time quantum 205.Can remaining data subcarrier 206 be redistributed to pf open-loop user stations 106 based on this cyclic shift.An example so hereinafter will be done to this more detailed description shown in Fig. 4 B.
In some other embodiment, base station 102 can be redistributed the remaining data subcarrier 206 of downlink subframe 103 to pf open-loop user stations 106 by for each or a plurality of time quantum 205 remaining data subcarrier 206 being renumberd.Can renumber based on this remaining data subcarrier 206 is redistributed to pf open-loop user stations 106.An example so hereinafter will be done to this more detailed description shown in Fig. 4 C.
Closed-loop user station 104 can comprise the subscriber station with known channel state, and pf open-loop user stations 106 comprises the subscriber station with unknown channel state.In certain embodiments, base station 102 can select the data subcarriers of contiguous set 204 to be used for distributing based on the favourable channel condition information that is provided by closed-loop user station 104, but scope of the present invention is unrestricted in this regard.In these embodiments, closed-loop user station 104 can be gone back to base station 102 with part or all of information feedback.In these embodiments, base station 102 can select the subcarrier of contiguous set to be used for distributing to closed-loop user station 104 based on the channel condition information of feedback.
In certain embodiments, the data subcarriers of contiguous set 204 can be provided based on the index that is provided by closed-loop user station 104 (index) in base station 102.One group of contiguous data subcarriers being selected by specific closed-loop user station 104 can be indicated in this index.In these other embodiment, closed-loop user station 104 can feed back to base station 102 with the index of the required subband of indication (that is, the subcarrier of contiguous set).The sub-carrier allocation of the contiguous set 204 that in these embodiments, base station 102 can be indicated with this index is given specific closed-loop user station 104.
In certain embodiments, the quantity of the data subcarriers in the contiguous set of each closed-loop user station 104 can be determined to distribute to based on the coherence bandwidth of the channel related with each closed-loop user station 104 in base station 102, but scope of the present invention is unrestricted in this regard.In certain embodiments, because do not need each contiguous set 204 to comprise the subcarrier of equal number, can change (that is, the block size can change) so distribute to the quantity of the data subcarriers in the group at closed loop station.
In certain embodiments, downlink subframe 103 can comprise the set of pilot subcarrier.Closed-loop user station 104 and pf open-loop user stations 106 all can be utilized with the set of pilot subcarrier and carry out channel estimation with for the treatment of the data that received.In these embodiments, pilot subcarrier can be that closed-loop user station 104 and pf open-loop user stations 106 are common.As mentioned above, closed-loop user station 104 can offer base station 102 with the channel condition information based on the channel estimation.In certain embodiments, pf open-loop user stations 106 can become closed-loop user station 104 after base station 102 provides channel condition information.On the other hand, closed-loop user station 104 can be in the base station 102 becomes pf open-loop user stations 106 when having the efficient channel state information of this subscriber station no longer.
In certain embodiments, base station 102 can utilize beam-forming schemes to send the data to some closed-loop user station 104.In these embodiments, can form channel by wave beam and send some dedicated pilot subcarriers to allow closed-loop user station 104 estimation beam forming matrix or weight and channel response matrixs.Other subscriber station does not generally receive or uses these dedicated pilots.According to some embodiment, do not adopt the closed-loop user station 104 of beam-forming schemes to realize the performance that increases by selecting favourable subband, this discusses as mentioned.In adopting the embodiment of beam-forming schemes, total pilot subcarrier is not carried out wave beam and form and process, so that all subscriber stations can both not be subjected to wave beam to form estimated channel responses under the impact of weight.
Although among the figure base station 102 is shown and has several independently function element, but wherein one or more function element can make up, and can be by realizing such as the software-configured elements of the treatment element that comprises digital signal processor (DSP) and/or the combination of other hardware element.For example, some elements such as TFUA110 can comprise one or more microprocessors, DSP, application-specific integrated circuit (ASIC) (ASIC) and be used for carrying out at least the various hardware of function described herein and the combination of logical circuit.In certain embodiments, the function element of base station 102 (such as TFUA110) can refer to one or more processes of operating at one or more treatment elements.
For closed-loop user station 104, because the peak value of different closed-loop user station 104 can clash (namely, two closed-loop user station 104 are wanted identical subcarrier or phase subcarrier on the same group), so unlikely each closed-loop user station 104 of dispatching is that downlink subframe 103 is on its peak value channel response.Similarly, some subcarriers may be unfavorable to many closed-loop user station 104, and they should be assigned to closed-loop user station 104.This can cause the waste of system resource.Because pf open-loop user stations 106 is not fastidious for specified subcarrier, as long as specified subcarrier has enough frequencies (or time) span (namely, frequency diversity) gets final product, so the combination of aforesaid two kinds of sub-carrier allocation patterns can help to cut the waste, thereby can more effectively use channel width.In these embodiments, the closed-loop user station 104 that its channel condition information can be used at first can be distributed to the subcarrier (utilizing the localization technology) of contiguous set 204 in base station 102, then residual subcarrier 206 can be distributed to pf open-loop user stations 106.Be used for residual subcarrier 206 is distributed to the hereinafter in more detail description of some specific embodiments of pf open-loop user stations 106.
In certain embodiments, at first residual subcarrier 206 can be renumberd to form a group.Base station 102 can be assigned to the subcarrier in this group different pf open-loop user stations 106.The quantity of distributing to the subcarrier of each pf open-loop user stations 106 can be different.A purpose that subcarrier is assigned to pf open-loop user stations 106 is in order to help to increase frequency diversity or to make the frequency diversity maximization.In certain embodiments, two standards can be realized in base station 102: span scope and the uniformity.In these embodiments, specified subcarrier can be crossed over remaining bandwidth as far as possible widely, and the deviation sum of the subcarrier spacing of each pf open-loop user stations 106 can be reduced to minimum.Deviation is less, and the subcarrier spacing of specific pf open-loop user stations 106 is just more even.
In pf open-loop user stations 106, distribute some embodiment of residual subcarrier 206 that sequence of natural numbers is divided into a plurality of subsequences, in order to the deviation sum of the spacings of these subsequences is reduced to minimum.For one or more OFDMA symbols, distribution can remain unchanged, but scope of the present invention is unrestricted in this regard.In these embodiments:
N
sThe quantity of=available subcarriers;
The quantity of the pf open-loop user stations 106 that K=dispatches;
L
kThe quantity of the subcarrier that the=the k subscriber station is required.
The optimality of distribution technique can be weighed by the deviation sum on the subcarrier spacing of each subscriber station as follows:
Wherein, d
k(i)=c
k(i)-c
k(i-1) be i subcarrier spacing of k subscriber station, i=2 ..., L
kc
k(i) be subcarrier position;
Be the deviation with respect to the average headway of k subscriber station, and γ is certain integer such as 1 or 2.An example of this distribution technique as shown in Figure 3.
In certain embodiments, carry out frequency partition.In these embodiments, can be according to their load L
kS is with N
sIndividual subcarrier is assigned to pf open-loop user stations 106.Load L
kS can be according to descending sort, so that L
K-1〉=L
k, wherein k=2 ..., K.
In certain embodiments, can carry out optimum allocation.In these embodiments, can at first remove ratio L
1: L
2: ...: L
KCommon factor, the gained ratio is l
1: l
2: ...: l
KCan utilize the Viterbi searching algorithm to find the optimum allocation of this ratio, but scope of the present invention is unrestricted in this regard.Because should search more time-consuming, thus can calculated off-line and the allocation model of each useful ratio of storage, but scope of the present invention is unrestricted in this regard.
In certain embodiments, can carry out sub-optimal allocation.In these embodiments, can at first remove ratio L
1: L
2: ...: l
KCommon factor, the gained ratio is l
1: l
2: ...: l
KCan utilize " rounding off " algorithm to calculate the sub-optimal allocation of this ratio.Because it is fairly simple to be somebody's turn to do calculating, so can generate online allocation model by base station 102 and subscriber station 104,106.
In certain embodiments, can determine sub-optimal allocation with following process.At first can use " rounding off " technology that the load ordering of subscriber station is l
1〉=... 〉=l
K, then can in the following manner residual subcarrier 206 be assigned to each pf open-loop user stations 106:
1) establishes n=1;
2) index on the calculating residual subcarrier
And with q
iIndividual subcarrier is assigned to subscriber station n, wherein i=1...L
n
3) residual subcarrier is renumberd;
4) if n＜K then adds n 1 and turn back to step 2.Otherwise, residual subcarrier is assigned to subscriber station K.
Term " rounds off " and refers to real number is rounded up to the function " round " of nearest integer, and this function can be used such as the integer function of floor (to round down) and ceiling (being rounded up to) and replace.Because the first pf open-loop user stations 106 can receive the optimum spacing of its subcarrier, so this technology at first can be distributed to residual subcarrier the pf open-loop user stations 106 with peak load.As a result, because the pf open-loop user stations 106 of early distributing has more available right to choose, so can specify for the pf open-loop user stations 106 of early distributing the subcarrier of the spacing (spacing) with the pf open-loop user stations 106 that is better than distributing after a while.
In another embodiment, because the subcarrier residue can also be arranged after distributing, so some subcarriers are not assigned to any pf open-loop user stations 106.In these embodiments, can use virtual (or pseudo-) subscriber station to unspecified subcarrier.The Virtual User station can be treated equally with pf open-loop user stations 106, and it also can use aforesaid distribution technique.The load at Virtual User station can be with the ordering of actual user station.After distributing all subcarriers, can not transmit any data at the subcarrier of distributing to the Virtual User station.In other embodiments, can revise " rounding off " algorithm to adapt to the Virtual User station.
In other embodiments, the load L of true pf open-loop user stations 106
kS can be according to descending sort, so that L
K-1〉=L
k, wherein k=2 ..., K.The load at Virtual User station can be expressed as
It should be noted that L
K+1Can be greater than certain L
k, wherein k=1 ..., K.Can at first remove ratio L
1: L
2: ...: L
K: L
K+1Common factor, the gained ratio is l
1: l
2: ...: l
K: L
K+1
Can use following process:
1) establishes n=1;
2) index on the calculating residual subcarrier
And with q
iIndividual subcarrier is assigned to subscriber station n, wherein i=1...L
nThis technical name is from the function " round " that real number is rounded up to nearest integer, and this function can be used such as the integer function of floor and ceiling and replace;
3) residual subcarrier is renumberd;
4) if n≤K then increases n and turns back to step 2.Otherwise process stops not re-use residual subcarrier.
Can increase the Virtual User station in the aforesaid method of last usefulness of the subcarrier that distributes remaining set 206.Similarly, can at first increase the Virtual User station, and in the first situation, can at first utilize suboptimal algorithm to extract the not subcarrier of usefulness, but scope of the present invention be unrestricted in this regard.
In other embodiments, the subcarrier that distributes can extend between the whole bandwidth of real pf open-loop user stations 106.In the network that comprises more than a base station, and the resource that not have effectively mutually to coordinate them when the base station divides timing, and base station 102 can extend (spreadout) and distribute to the subcarrier of pf open-loop user stations 106 in order to avoid cause the cochannel interference.For example, if two shared subcarriers in base station and each residential quarter have three subscriber stations, then can be that each subscriber station is specified a subcarrier.Utilize technology 1, subcarrier 8,9,10 can be used in residential quarter 1, and subcarrier 8,9,10 also can be used in residential quarter 2.If the sub-carrier number in two residential quarters does not have difference, then these two residential quarters can phase mutual interference.If the numbering there are differences or two residential quarters between coordination is arranged, then the subcarrier of these two groups of adjacency can separate.Between base station cell, seldom or do not have universal time coordinated, then more need to extend the contiguous subcarriers of distributing in order to avoid overlapping.Universal time coordinated is arranged between the base station, and the adjacency effect of above-mentioned distribution technique needs for avoiding interference.
In certain embodiments, can use following subcarrier allocation technique to help the resource that subscriber station is distributed in equilibrium.
At first, set of physical resources is defined as S
i=i, i=1,2 ..., N
s, wherein
It is the sum of distributing to the subcarrier at real user station; N
s〉=L, and spacing factor is defined as
Step in this process is as follows:
1) the subcarrier resources demand according to them sorts subscriber station, so that l
1〉=l
2〉=... 〉=l
K
2) establish n=1 and
3) for i=1 ..., l
n, definition
4) computation index set
Wherein ceil can replace with round or floor, and it is made further modification to obtain
Then, with { S
iIn the set { q of resource element (subcarrier)
i, for i=1 ..., l
nBe assigned to and have demand l
nThe nth user;
5) from { S
iIn remove the subcarrier of appointment in the back, to form the set through upgrading of remaining subcarrier that will appointment.Upgrade
Available subcarriers quantity with the reflection minimizing;
6) if n≤K then increases n and turns back to step 3.
Utilize this process, can be with the frequency expansion maximization of the resource of distributing, but scope of the present invention is unrestricted in this regard.
In certain embodiments, sub-carrier allocation can along with the time meta-unit 205 difference and change order.When being the subscriber station assigning sub-carriers at two meta-unit 205 when adjacent, may need the position of the subcarrier of this subscriber station to change along with the time, further frequency diversity is maximized.This can allow subscriber station to adopt different sets of subcarriers along with the time.In certain embodiments, the time change order can be shown in Fig. 4 B and 4C by along with the time subcarrier being renumberd to carry out, this will discuss hereinafter in more detail.Can carry out the continuity that renumbers to keep subcarrier.Two kinds of methods comprise displacement and reverse.As mentioned above, can be an OFDMA symbol with sub-carrier allocation to the time meta-unit 205 of pf open-loop user stations 106, and can meta-unit 205 be closed-loop user station 104 assigning sub-carriers for more than one the time, describedly can comprise a subframe that nearly has 6 or more OFDMA symbols more than a time quantum 205, but scope of the present invention is unrestricted in this regard.
In certain embodiments, base station 102 can be before or after distributing local unit with the numbering cyclic shift of subcarrier.That is, the starting point of sub-carrier number can change along with the OFDMA symbol, and the numbering in bandwidth around.
Fig. 4 A is illustrated in the downlink subframe in the situation about subcarrier not being renumberd.Fig. 4 B illustrates according to some embodiments of the present invention has the downlink subframe that cyclic shift renumbers subcarrier.Fig. 4 C illustrates according to some embodiments of the present invention subcarrier is carried out oppositely the alternately downlink subframe of numbering.In Fig. 4 A-4C, the digital 1-6 shown in the T/F unit can corresponding to specific pf open-loop user stations 106, can be that this specific pf open-loop user stations 106 is specified these specific T/F unit (unit) 201.For the sake of simplicity, among the figure downlink subframe 103 is shown and only has 9 subcarriers (three are designated as one group of contiguous subcarriers), but actual realization can comprise nearly 100 or more subcarrier.
With reference to Fig. 4 B, when being shifted subcarrier before distributing to closed-loop user station 104, renumbeing of residual subcarrier can begin from the residual subcarrier that has lowest numeric original number.The number of subcarriers of displacement can be greater than the coherence bandwidth of channel.For example, for the 3GPPLTE network, 75 subcarriers (this is corresponding to the 1.125MHz bandwidth) that are shifted just are enough to, but scope of the present invention is unrestricted in this regard.
With reference to Fig. 4 C, in these embodiments, can adopt reverse numbering.In these embodiments, before or after distributing to closed-loop user station 104 (that is, before or after the subcarrier with contiguous set 204 is assigned to closed-loop user station 104), can be in the time of one meta-unit 205 alternately that sub-carrier number is reverse.Renumbeing of residual subcarrier can begin from the residual subcarrier that has lowest numeric original number, but scope of the present invention is unrestricted in this regard.
In certain embodiments, the distribution of subcarrier can be specified by base station 102 in down link (control) channel or mapping frame, so that the subscriber station of institute's addressing can be retrieved their data.In certain embodiments, base station 102 can be that closed-loop user station 104 is specified sub-carrier allocation at each time allocation units at first.The sub-carrier allocation of pf open-loop user stations 106 can be specified in the following manner: can send duty ratio l
1: l
2: ... l
KReach corresponding subscriber station index (or ID), wherein can comprise index and the load at Virtual User station.The method of renumbeing can pre-determine, and does not need concrete appointment, but scope of the present invention is unrestricted in this regard.
In certain embodiments, the frequency-time resource allocation techniques of discussing here is adapted at using in the 3GPP LTE system, but scope of the present invention is unrestricted in this regard.These embodiment of the present invention can help simultaneously the stand frequency-time diversity maximization of diversity and pf open-loop user stations 106 of the multi-user with closed-loop user station 104, but scope of the present invention is unrestricted in this regard.
In certain embodiments, subscriber station 104,106 can comprise portable radio communication device, can receive and/or the equipment of the information of transmission by wireless mode such as personal digital assistant (PDA), the on knee or portable computer with wireless communication ability, web-tablet, radio telephone, wireless headset, beep-pager, instant messaging device, digital camera, access point, TV, Medical Devices (such as heart rate monitor, blood pressure monitor etc.) or other.
In certain embodiments, base station 102 and subscriber station 104,106 can be according to the standard traffics such as the pan-European mobile system standard that is called global system for mobile communications (GSM), comprise the communication technology according to 3G wireless standard (for example, third generation partner program (3GPP) technical specification 3.2.0 version or the later version in March, 2000).At some embodiment, can communicate by letter according to 3GPP long-term evolution (LTE) standard with subscriber station 104,106 in base station 102, but scope of the present invention is unrestricted in this regard.
In some other embodiment, base station 102 can be the part of World Interoperability for Microwave Access, WiMax (WiMax) communication station.In certain embodiments, can communicate by letter with IEEE802.16 (e) standard (comprising its modification and evolution) according to the IEEE802.16-2004 of wireless MAN (WMAN) with subscriber station 104,106 in base station 102, but scope of the present invention is unrestricted in this regard, because they also can be fit to send and/or received communication according to other technology and standard.For more information about the IEEE802.16 standard, see the May 2005 of the "IEEE Standard for Information technology - Telecommunications and inter-system information exchange" - MAN - Specific requirements Part -16: "Fixed Broadband Wireless Access system air interface "(" IEEE? Standards? forInformation? Technology-Telecommunications? and? InformationExchange? between? Systems "-Metropolitan? Area? Network-SpecificRequirements-Part? 16:" Air? Interface? for? Fixed? Broadband? WirelessAccess ? System, ") and the related amendment / revision.
Antenna 101,105 can comprise one or more two-way or omnidirectional antennas, comprises for example antenna that is suitable for transmitting the RF signal of dipole antenna, monopole antenna, paster antenna, loop aerial, microstrip antenna or other type.In certain embodiments, not to use two or more antennas, but can use the individual antenna with a plurality of holes.In these embodiments, to can be considered be an independently antenna in each hole.In some multiple-input and multiple-outputs (MIMO) embodiment, the different characteristic of channel that antenna 101,105 can effectively separate to utilize space diversity and produce between base station 102 and subscriber station 104,106.
Unless specify in addition, such as process, calculate, calculation, determine, data that the term such as demonstration can refer to handle physics (such as the electronics) amount in the RS that is expressed as treatment system and this data transformation is one or more processing of other data of the register that is expressed as similarly this treatment system or the physical quantity in the memory or action and/or the process of computing system or similar devices or information storage, transmission or display device other.In addition, as used herein, computing equipment comprises and one or more treatment elements of computer-readable memory coupling that wherein computer-readable memory can be volatibility or nonvolatile memory or its combination.
Some embodiments of the present invention can realize in hardware, firmware, software or its combination.Embodiments of the invention also can be used as the instruction that is stored on the machine readable media and realize, at least one processor can read and carry out these instructions to carry out operation described herein.Machine readable media can comprise for any mechanism that stores or transmit with the information of machine (such as computer) readable form.For example, machine readable media can comprise the transmitting signal (such as carrier wave, infrared signal, digital signal etc.) of read-only memory (ROM), random access memory (RAM), magnetic disk storage medium, optical storage media, flash memory device, electricity, light, sound or other form etc.
Abideing by 37C.F.R.Section1.72 (b) provides summary, requires summary can make the reader understand fully the disclosed character of technology and main points.Should understand during submission that it is not used in restriction or explains scope or the meaning of claim.
In above detailed description, once in a while each feature is concentrated among the single embodiment, to simplify present disclosure.Method of the present disclosure should not be construed as the such intention of reflection, i.e. the embodiment of this theme institute prescription need to be than the more feature of feature of clearly narrating in each claim.But, as the claim of enclosing reflects, the invention reside in the feature of lacking than all features of single disclosed embodiment.Therefore, the claim of enclosing is incorporated into detailed description thus, and each claim is separately as an independent preferred embodiment.
Claims (24)
1. in wireless access network, a kind of method of the T/F unit for the allocation of downlink subframe comprises:
The data subcarriers of contiguous set on frequency of described downlink subframe is distributed to closed-loop user station; And
With the remaining data sub-carrier allocation of described downlink subframe to pf open-loop user stations, to increase frequency diversity.
2. the method for claim 1, wherein said downlink subframe comprise meta-unit when a plurality of, and
Described method also comprises:
Described closed-loop user station is distributed to the data subcarriers of described contiguous set in meta-unit during in the described downlink subframe each; And
Described pf open-loop user stations is given with remaining noncontiguous data sub-carrier allocation in meta-unit during in the described downlink subframe each.
3. method as claimed in claim 2, wherein said wireless access network is OFDM (OFDMA) net,
Each the time meta-unit comprise the OFDMA symbol,
The data subcarriers of described contiguous set is distributed to described closed-loop user station comprise for a plurality of OFDMA symbols the data subcarriers of identical contiguous set is distributed to described closed-loop user station, and
Comprising for each OFDMA symbol for described pf open-loop user stations described remaining data sub-carrier allocation redistributes described remaining data subcarrier to described pf open-loop user stations.
4. method as claimed in claim 2, described closed-loop user station before giving described pf open-loop user stations with described remaining data sub-carrier allocation, is distributed to the data subcarriers of described contiguous set in meta-unit during wherein for each.
5. the method for claim 1, wherein give described pf open-loop user stations by following steps with described remaining data sub-carrier allocation:
Remaining contiguous data subcarriers sequential system is divided into a plurality of subsequences; And
On the basis of each sequence will with described a plurality of sequences in the data subcarriers of a serial correlation distribute to described pf open-loop user stations.
6. method as claimed in claim 5, wherein said a plurality of subsequences are chosen as has different length.
7. method as claimed in claim 5, wherein said a plurality of subsequences are chosen as has identical length.
8. method as claimed in claim 2 also comprises by following steps the remaining data subcarrier of described downlink subframe is redistributed to pf open-loop user stations:
For each or a plurality of time quantum with described remaining data subcarrier cyclic shift; And
Give described pf open-loop user stations based on described cyclic shift with described remaining data sub-carrier allocation.
9. method as claimed in claim 2 also comprises by following steps the remaining data subcarrier of described downlink subframe is redistributed to pf open-loop user stations:
For each or a plurality of time quantum described remaining data subcarrier is renumberd; And
Renumber described remaining data sub-carrier allocation to described pf open-loop user stations based on described.
10. the method for claim 1, wherein said closed-loop user station comprises the subscriber station with known channel state,
Described pf open-loop user stations comprises the subscriber station with unknown channel state, and
The base station selects the data subcarriers of described contiguous set to be used for distributing based on the channel condition information that is provided by described closed-loop user station.
11. the method for claim 1, wherein closed-loop user station comprises the subscriber station with known channel state,
Pf open-loop user stations comprises the subscriber station with unknown channel state, and
The base station distributes the data subcarriers of described contiguous set, described index to indicate the data subcarriers of one group of adjacency that described closed-loop user station selects based on the index that is provided by described closed-loop user station.
12. the method for claim 1 also comprises the quantity of determining to distribute to the data subcarriers in the contiguous set of each closed-loop user station based on the coherence bandwidth of the channel related with each closed-loop user station in the described closed-loop user station.
13. the method for claim 1, wherein said downlink subframe comprises the set of pilot subcarrier, and
Described closed-loop user station and described pf open-loop user stations all use the set of described pilot subcarrier carry out channel estimation for described closed loop and pf open-loop user stations for the treatment of the data that receive.
14. in wireless access network, a kind of T/F unit allocator of the T/F unit for the allocation of downlink subframe comprises:
Be configured to the data subcarriers of contiguous set on frequency of downlink subframe is distributed to the parts of closed-loop user station, and
Be configured to the remaining data sub-carrier allocation of described downlink subframe to pf open-loop user stations to increase the parts of frequency diversity.
15. T/F unit allocator as claimed in claim 14, wherein said downlink subframe comprise meta-unit when a plurality of, and
Described T/F unit allocator also comprises: the parts of described closed-loop user station are distributed to the data subcarriers of described contiguous set in meta-unit when being configured to in the described downlink subframe each, and when being configured to in the described downlink subframe each meta-unit with the parts of remaining noncontiguous data sub-carrier allocation to described pf open-loop user stations.
16. T/F unit allocator as claimed in claim 15, wherein said T/F unit allocator operates in OFDM (OFDMA) net,
Each the time meta-unit comprise the OFDMA symbol,
Described T/F unit allocator also comprises and is configured to for a plurality of OFDMA symbols the data subcarriers of identical contiguous set be distributed to the parts of described closed-loop user station, and
Described T/F unit allocator also comprises and is configured to for each OFDMA symbol described remaining data subcarrier be redistributed parts to described pf open-loop user stations.
17. T/F unit allocator as claimed in claim 15, meta-unit during wherein for each, described T/F unit allocator comprise the parts that are configured to before giving described pf open-loop user stations with described remaining data sub-carrier allocation the data subcarriers of described contiguous set be distributed to described closed-loop user station.
18. T/F unit allocator as claimed in claim 14, wherein in order to give described pf open-loop user stations with described remaining data sub-carrier allocation, described T/F unit allocator also comprises and is configured to remaining contiguous data subcarriers sequential system is divided into a plurality of subsequences, and on the basis of each sequence will with described a plurality of sequences in the data subcarriers of a serial correlation distribute to the parts of described pf open-loop user stations.
19. T/F unit allocator as claimed in claim 15, wherein for the remaining data subcarrier of described downlink subframe is redistributed to pf open-loop user stations, described T/F unit allocator also comprises and being configured to for each or a plurality of time quantum described remaining data subcarrier cyclic shift, and described remaining data sub-carrier allocation given the parts of described pf open-loop user stations based on described cyclic shift.
20. T/F unit allocator as claimed in claim 15, wherein for the remaining data subcarrier of described downlink subframe is redistributed to pf open-loop user stations, described T/F unit allocator also comprises and is configured to for each or a plurality of time quantum described remaining data subcarrier be renumberd, and renumbers the parts of described remaining data sub-carrier allocation to described pf open-loop user stations based on described.
21. T/F unit allocator as claimed in claim 14, wherein said closed-loop user station comprises the subscriber station with known channel state,
Described pf open-loop user stations comprises the subscriber station with unknown channel state, and
Described T/F unit allocator also comprises the parts of selecting the data subcarriers of described contiguous set be used for to distribute based on the channel condition information that is provided by described closed-loop user station is provided.
22. T/F unit allocator as claimed in claim 14, wherein closed-loop user station comprises the subscriber station with known channel state,
Pf open-loop user stations comprises the subscriber station with unknown channel state, and
Described T/F unit allocator also comprises the parts that are configured to distribute based on the index that is provided by described closed-loop user station the data subcarriers of described contiguous set, and described index indication is by the data subcarriers of one group of adjacency of described closed-loop user station selection.
23. T/F unit allocator as claimed in claim 14, wherein said T/F unit allocator also comprise the parts that are configured to determine to distribute to based on the coherence bandwidth of the channel related with each closed-loop user station in the described closed-loop user station quantity of the data subcarriers in the contiguous set of each closed-loop user station.
24. T/F unit allocator as claimed in claim 14, wherein said downlink subframe comprises the set of pilot subcarrier, and
Described closed-loop user station and described pf open-loop user stations all use the set of described pilot subcarrier carry out channel estimation for described closed loop and pf open-loop user stations for the treatment of the data that receive.
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| US11/687,393 US8131306B2 (en) | 2006-03-20 | 2007-03-16 | Wireless access network and method for allocating data subcarriers within a downlink subframe based on grouping of user stations |
| PCT/US2007/064302 WO2007109610A1 (en) | 2006-03-20 | 2007-03-19 | Wireless access network and method for allocating time and frequency resources |
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| CN101405965A (en) | 2009-04-08 |
| CN101405973A (en) | 2009-04-08 |
| CN101405966B (en) | 2016-01-20 |
| CN101405966A (en) | 2009-04-08 |
| CN101405965B (en) | 2012-08-15 |
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