CN102255704A - Training sequence allocation for SDM (Space Division Multiplexing) - Google Patents
Training sequence allocation for SDM (Space Division Multiplexing) Download PDFInfo
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- CN102255704A CN102255704A CN2010101855511A CN201010185551A CN102255704A CN 102255704 A CN102255704 A CN 102255704A CN 2010101855511 A CN2010101855511 A CN 2010101855511A CN 201010185551 A CN201010185551 A CN 201010185551A CN 102255704 A CN102255704 A CN 102255704A
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Abstract
The invention provides a training sequence allocating method and device for SDM (Space Division Multiplexing) used in a communication system containing at least one UE (User Equipment) as well as a base station and a communication system. The training sequence allocating method comprises the following steps: allocating same channelized codes to the at least one UE and allocating different training sequence codes to the at least one UE. According to the training sequence allocating method, different training sequence codes are allocated to different UE at the SDM moment. Compared with the condition of allocating the same training sequence codes to different UE, the training sequence allocating method has the advantages that interference among the UE is reduced, the system throughout is improved and the demand on the isolating degree between different antenna ports is reduced.
Description
Technical field
The present invention relates to radio communication, relate in particular to a kind of exercise sequence distributing method and equipment that is used for space division multiplexing (SDM).
Background technology
Multi-antenna technology is one of TD SDMA (TD-SCDMA) system inherent advantages technology, therefore can utilize SDM to increase the capacity of system greatly for the subscriber equipment enough far away (UE) of being separated by.For each subscriber equipment (UE), the base station is with the signal strength signal intensity of test constantly different antennae port, if two UE are in the coverage of different antennae port, these two UE insert (HSPA) for high-speed packet and can use identical channel code so, in the TD-SCDMA system Orthogonal Variable Spreading Factor OVSF (OVSF) sign indicating number, to increase the total throughout of system.Because different antenna port is used identical ovsf code, therefore can produce the interference between the UE, this means should have enough degree of isolation to eliminate or to weaken the interference adverse effect between the UE.
Fig. 1 is the schematic diagram of TD-SCDMA wireless frame structure.As can be seen from Figure 1, the radio frames of each 10ms comprises the subframe of two 5ms, and each subframe comprises 6 time slots (TS) again, wherein the signal of each time slot comprise data division and in lead the sequence part.In to lead sequence be training sequence in the TD-SCDMA system physical channel burst structure, be used for channel estimating, power control and adjust synchronously.Therefore, when carrying out SDM, data division with in to lead sequence part be different for the sensitivity of disturbing or the requirement of degree of isolation.The data division of carrying user data is lower to the requirement of degree of isolation, and is used for leading sequence part higher degree of isolation requirement should being arranged of channel estimating.
In present TD-SCDMA network, for the Uplink/Downlink data, in lead the sequence allocation pattern and all be set to default mode (referring to 3GPP R7 TS 25.221), this means that leading sequence allocation in the Uplink/Downlink will use fixing and mapping relations ovsf code.Fig. 2 exemplarily be illustrated in ovsf code under the default mode and in lead fixedly mapping relations between the sequence code (midamble).For example, insert (HSDPA) for high-speed downlink packet, if a UE uses 8 16 yards of SF { C16 (1)～C16 (8) }, it will take and lead sequence code M (1) in 4 so, M (2), M (3), M (4), insert (HSUPA) for High Speed Uplink Packet,, then will take and lead sequence code M (1) in one if a UE uses 1 SF2 sign indicating number { C2 (1) }.Therefore when under default mode, carrying out SDM, if two UE share identical ovsf codes, mean so they in to lead sequence code also be identical.Two or more UE use and lead sequence code in identical, and disturbing between the UE that is produced to influence the accuracy of channel estimating, and finally influence transmission performance.On the other hand, in order to overcome the interference adverse effect of leading sequence code in identical, will uprise for the requirement of antenna port degree of isolation.
Summary of the invention
Therefore, need a kind of scheme that can overcome above-mentioned defective.
According to an aspect of the present invention, above-mentioned target is used for leading the sequence code distribution method in the communication system space division multiplexing SDM that comprises at least one user equipment (UE) and realizes by providing a kind of.The method comprising the steps of: for described at least one UE distributes identical channel code; And be that described at least one UE distributes different training sequence codes.
Described training sequence code can be distributed by radio network controller (RNC).Described different training sequence code can be distributed when SDM is carried out in decision by base station node B.
Described method can also comprise: radio network controller (RNC) is reserved available training sequence code set, wherein the Node B training sequence code that selection will distribute from described available training sequence code is gathered.Described method can also comprise: the training sequence code allocation model of described at least one subscriber equipment is set to AD HOC.
Described communication system can be a TD SDMA TD-SCDMA system, and described channel code can be the Orthogonal Variable Spreading Factor OVSF ovsf code, and described training sequence is led sequence code in can being.Described different training sequence code maximum number can be 8.
This method can also comprise: notify described at least one UE by scheduling message with the training sequence code that distributes.
According to another aspect of the present invention, above-mentioned target is used for leading the equipment that sequence code distributes and realizes by providing a kind of in the communication system space division multiplexing that comprises at least one user equipment (UE).This equipment comprises: the channelization code resource scheduler, and it is that described at least one UE distributes identical channel code; With the training sequence code Resource Scheduler, it is that described at least one UE distributes different training sequence codes.
Described training sequence code Resource Scheduler can be arranged in radio network controller (RNC).Described training sequence code Resource Scheduler can be arranged in base station node B.
Radio network controller (RNC) can be reserved the set of available training sequence code, and wherein the training sequence code Resource Scheduler can be selected the training sequence code that will distribute from described available training sequence code set.Described training sequence code Resource Scheduler can described at least one subscriber equipment the training sequence code allocation model be set to AD HOC.
Described training sequence code Resource Scheduler can be notified described at least one UE with the training sequence code that distributes by scheduling message.
According to an aspect of the present invention, above-mentioned target realizes by a kind of base station node B of aforesaid equipment that comprises is provided.
According to an aspect of the present invention, above-mentioned target is by providing a kind of communication system, and it comprises at least one user equipment (UE) and aforesaid base station node B.
Description of drawings
Now with reference to the following drawings the present invention is described more specifically, in the accompanying drawing:
Fig. 1 illustrates the schematic diagram of TD-SCDMA wireless frame structure,
Fig. 2 exemplarily be illustrated in ovsf code under the default mode and in lead fixedly mapping relations between the sequence code,
Fig. 3 exemplarily illustrates the schematic diagram of application TD-SCDMA of the present invention system,
During illustrating according to an embodiment of the invention, Fig. 4 leads the schematic flow diagram of sequence code distribution method,
During illustrating in accordance with another embodiment of the present invention, Fig. 5 leads the schematic flow diagram of sequence code distribution method,
Fig. 6 illustrates the schematic diagram of implementing equipment of the present invention, and
Fig. 7 illustrates the simulation curve figure of BLER (block error rate) and signal to noise ratio (Eb/N0),
Embodiment
Hereinafter with reference to accompanying drawing the embodiment of the invention is described more fully, the embodiment of the invention shown in the drawings.Yet, can multi-formly implement the present invention with a lot, and the present invention should not be construed as to be subject to and the embodiments set forth herein.In the text, use similar label to represent similar element.
Only be used to describe the purpose of specific embodiment at this employed term, and be not intended to limit the present invention.As used in this, " " of singulative, " one ", " this " are intended to comprise equally plural form, unless context clearly refers else.Will be further understood that, when when this uses, term " comprises " feature, integral body, step, operation, element and/or the assembly of specifying appearance to be stated, but does not get rid of the appearance or the interpolation of one or more further features, integral body, step, operation, element, assembly and/or its group.
Unless otherwise defined, otherwise this employed term (comprising technical term and scientific terminology) have with those skilled in the art the common same meaning of understanding.Will be further understood that, this employed term should be interpreted as having with its in the context of this specification and the meaning of the meaning unanimity in the relevant field, and will not explain, unless in this specially so definition with Utopian or too formal meaning.
Following reference illustrates block diagram and/or flow chart description the present invention of method, device (system) and/or computer program according to the embodiment of the invention.Should be understood that the combination that can realize the piece of piece of block diagram and/or flowchart illustration and block diagram and/or flowchart illustration by computer program instructions.These computer program instructions can be offered processor and/or other programmable data processing unit of all-purpose computer, special-purpose computer, to produce machine, the method that makes the instruction of carrying out via computer processor and/or other programmable data processing unit create to be used for function/action of realizing that block diagram and/or flow chart block are specified.
Correspondingly, can also implement the present invention with hardware and/or software (comprising firmware, resident software, microcode etc.).Further, the present invention can take computer to use or computer-readable recording medium on the form of computer program, it has the computer of realizing and can use or computer readable program code in medium, to be used by instruction execution system or combined command executive system and using.In the context of the invention, computer can use or computer-readable medium can be an arbitrary medium, it can comprise, store, communicates by letter, transmits or convey program, and being used by instruction execution system, device or equipment, or combined command executive system, device or equipment use.
In context, be that example has been described the present invention with the TD-SCDMA system.Yet it will be appreciated by those skilled in the art that the present invention is not limited to this, but can be applied to that all use the wireless communication systems of SDM technology at present and in the future, for example comprise WCDMA, CDMA2000, TD-SCDMA), Wimax and LTE system.In specification, for convenience's sake, adopt the example of two antenna ports and two UE to be described, but in fact the quantity of antenna port and UE is not limited to this.In context, use the term such as UE, RNC, it will be appreciated by those skilled in the art that they may have different corresponding terms in other standards, therefore should be interpreted as having the implication of implication unanimity in the relevant field.Although used the example of ovsf code in the specification, it will be appreciated by those skilled in the art that the sign indicating number that may adopt other types in other communication standards is as channel code as channel code.Equally, although lead sequence code in having described here, the present invention can be applied to the training sequence in other communication standards.
Below in conjunction with accompanying drawing, the present invention is described with reference to embodiments of the invention.
Fig. 3 exemplarily illustrates the schematic diagram of application TD-SCDMA of the present invention system 100.In Fig. 3, TD-SCDMA system 100 comprises core net (CN) 110, radio network controller (RNC) 120 and a plurality of base station (Node B) 130.One of them base station 130 has N antenna port, is respectively applied for zones different in the coverage cell.Typically, these zones are separated by the barrier of nature, and for example, the different floors of same seat building are separated by floor, and dispose different antenna ports respectively at different floors.In Fig. 3, suppose that the UE 1 and the UE 2 that are positioned at contiguous floors are covered by antenna port 1 and antenna port 2 respectively.Because it is very high that signal penetrates the loss of floor, so the uplink signal of UE 1 is mainly or only from antenna port 1, and the signal of UE 2 is then mainly or only from antenna port 2.For the HSPA scheduler, it can be by carrying out SDM for UE 1 ovsf code identical with the uplink channel assignment of UE 2, thereby the throughput of sub-district is doubled, and be unlikely to cause big interference.In Fig. 1, represent interference between UE that the uplink signal of UE 1 and UE 2, with dashed lines arrow represent that UE 1 and UE 2 cause respectively with solid arrow.Because the high-penetration loss of floor, so the interference between UE almost can be ignored.Certainly, except situation about being separated by barrier in the zone, SDM also carries out in other cases, for example, can cover by the directional antenna beam of antenna and realize.
Discuss as mentioned, for leading the sequence allocation pattern in default, if for two UE that are in two antenna ports distribute identical ovsf code to carry out SDM, so according to leading the sequence allocation pattern in default, these two UE also are assigned with and lead sequence code in same, even also have other to lead sequence code in unappropriated.
In order to improve transmission performance, reduce the requirement of antenna port degree of isolation, it is that different UE distributes and leads sequence code in different when SDM that the present invention proposes.
During illustrating according to an embodiment of the invention, Fig. 4 leads the flow chart of sequence code distribution method.RNC 120 leads the sequence code allocation model and is set to AD HOC in step S410, and leads sequence code for UE 1 and UE 2 distributes in different.Base station 130 can determine whether carrying out SDM by the signal strength signal intensity of test constantly different antennae port.How base station 130 determines whether to carry out SDM is technology known in those skilled in the art.When SDM was carried out in decision, then the base station was that UE 1 distributes identical ovsf code simultaneously with UE 2 at step S420.Like this, the up link of UE 1 and UE 2 be assigned with identical ovsf code with different in lead sequence code.With in lead the identical situation of sequence code and compare, use lead in different disturb between the UE that sequence code produces less relatively, particularly less to the interference of leading the sequence part in the signal, improve the accuracy of channel estimating, and finally improved throughput of system and transmission performance.Simultaneously, reduced requirement for the antenna port degree of isolation.
But, because RNC leads sequence code in distributing statically in the said method before SDM begins, and the One's name is legion of the UE that RNC covers, so RNC might lack and leads the sequence code resource in enough and come to distribute for numerous UE.In present TD-SCDMA standard, lead sequence code in available and have only 8, this means that in a Transmission Time Interval (TTI) maximum 8 UE can have to lead sequence code in different.
During illustrating in accordance with another embodiment of the present invention, Fig. 5 leads the flow chart of sequence code distribution method.As shown in Figure 5, RNC 120 leads sequence code set for UE 1 and UE 2 reserves in available in step 510.Described set can comprise several can for distribute to UE 1 and UE 2 in lead sequence code.When SDM was carried out in base station 130 decision, it can be that UE1 and UE 2 distribute identical ovsf code at step S520, and led from described reservation available at step S530 and to select leading sequence code in different in the sequence code set and distribute to UE 1 and UE 2.Base station 130 can be notified in specific that each UE will use by scheduling message and lead sequence code.Certainly, RNC 120 also can reserve and lead the sequence code set in available, and in this case, the base station can be led in the sequence code from all are available and be selected.In addition, step S520 and S530 can be that while or reverse order are carried out.
Compare with the method for describing among Fig. 4, lead the distribution of sequence code during the method among Fig. 5 proposes to incite somebody to action and give base station 130.Because decision SDM also is responsible in base station 130, therefore can be only when needing SDM dynamic assignment different in lead sequence code.In other words, in lead the method for distribution in Fig. 3 of sequence code by RNC and fix beginning most, but by base station decision in real time, therefore provide more flexibility.The base station can be only led sequence code for those need the UE of SDM to distribute in different, has only 8 even all lead sequence code in available, and is also enough generally speaking.
Owing to be that different UE has distributed and leads sequence code in different when SDM, therefore with for the different UEs distribution identical in lead sequence code situation compare, disturb between UE and reduce, the throughput of each UE is higher, thereby improved the throughput of system, and reduced the requirement of the degree of isolation between the different antennae port.
Fig. 6 illustrates the schematic diagram of implementing equipment 600 of the present invention.Equipment 600 can comprise channelization code resource scheduler 610 and training sequence code Resource Scheduler 620, channelization code resource scheduler 610 is that described at least one UE distributes identical channel code, and training sequence code Resource Scheduler 620 is that described at least one UE distributes different training sequence codes.It will be understood by those skilled in the art that here equipment 600 and the structure and the implementation of building block only be exemplary, be used for realizing the method flow of describing with reference to Fig. 4 and Fig. 5.Equipment 600 can be implemented by software and/or software (comprising firmware, resident software, microcode etc.).For example, channelization code resource scheduler 610 and training sequence code Resource Scheduler 620 can be positioned at base station 130, as the part of functions of Resource Scheduler and realize.Training sequence code Resource Scheduler 620 also can be positioned at RNC 120, as the part of functions of Resource Scheduler and realize.RNC 120 reserves available training sequence code set, training sequence code Resource Scheduler 620 training sequence code that selection will distribute from described available training sequence code is gathered.Training sequence code Resource Scheduler 620 can each UE the training sequence code allocation model be set to AD HOC.Training sequence code Resource Scheduler 620 can be notified each UE with the training sequence code that distributes by scheduling message.
To verify the solution of the present invention by simulation result below.
Fig. 7 is the simulation curve figure of BLER (block error rate) and signal to noise ratio (Eb/N0), wherein the representative of two curves use the situation of leading sequence code in different identical with use in lead the situation of sequence code.Simulated conditions is that UE quantity is 2, and channel type is 3GPP Case3, and RAB speed is 12.2kbp, and the degree of isolation between the UE is 10dB.As can be seen from Figure 7, under identical degree of isolation, two UE have lead the situation of sequence code in identical because be interfered in lead sequence and cause the accuracy of channel estimating to reduce, so have higher BLER (block error rate), thereby do not support higher data rate.The throughput of system correspondingly also can reduce.Use the situation of leading sequence code in different then can obviously improve systematic function.
Though described the present invention in conjunction with specific embodiments, do not planned to make the present invention to be limited to the concrete form of setting forth here.In fact, scope of the present invention is only limited by appended claims.
Claims (18)
1. training sequence code distributing method that is used at the communication system space division multiplexing SDM that comprises at least one user equipment (UE) is characterized in that the method comprising the steps of:
For described at least one UE distributes identical channel code; And
For described at least one UE distributes different training sequence codes.
2. the method described in claim 1 is characterized in that, described training sequence code is distributed by radio network controller (RNC).
3. the method for claim 1 is characterized in that, described different training sequence code is distributed when SDM is carried out in decision by base station node B.
4. method as claimed in claim 3 is characterized in that, this method also comprises:
Radio network controller (RNC) is reserved available training sequence code set,
Wherein Node B selects the training sequence code that will distribute from described available training sequence code set.
5. method as claimed in claim 2 is characterized in that, described method also comprises:
The training sequence code allocation model of described at least one subscriber equipment is set to AD HOC.
6. as each described method among the claim 1-5, it is characterized in that described communication system is a TD SDMA TD-SCDMA system, described channel code is the Orthogonal Variable Spreading Factor OVSF ovsf code, and described training sequence code is led sequence code in being.
7. as each described method among the claim 1-5, it is characterized in that described different training sequence code maximum number is 8.
8. as each described method among the claim 1-5, it is characterized in that this method also comprises:
Notify described at least one UE by scheduling message with the training sequence code that distributes.
9. one kind is used for the equipment that distributes at the training sequence code of the communication system space division multiplexing that comprises at least one user equipment (UE), it is characterized in that this equipment comprises:
The channelization code resource scheduler, it is that described at least one UE distributes identical channel code; With
The training sequence code Resource Scheduler, it is that described at least one UE distributes different training sequence codes.
10. the equipment described in claim 9 is characterized in that, described training sequence code Resource Scheduler is arranged in radio network controller (RNC).
11. equipment as claimed in claim 9 is characterized in that, described training sequence code Resource Scheduler is arranged in base station node B.
12. equipment as claimed in claim 11 is characterized in that, radio network controller (RNC) is reserved available training sequence code set, wherein the training sequence code Resource Scheduler training sequence code that selection will distribute from described available training sequence code is gathered.
13. equipment as claimed in claim 10 is characterized in that, the training sequence code allocation model of described at least one subscriber equipment of described training sequence code Resource Scheduler is set to AD HOC.
14., it is characterized in that described communication system is a TD SDMA TD-SCDMA system as each described equipment among the claim 9-13, described channel code is the Orthogonal Variable Spreading Factor OVSF ovsf code, and described training sequence code is led sequence code in being.
15., it is characterized in that described different training sequence code maximum number is 8 as each described equipment among the claim 9-13.
16., it is characterized in that described training sequence code Resource Scheduler is notified described at least one UE by scheduling message with the training sequence code that distributes as each described equipment among the claim 9-13.
17. a base station node B, it comprises according to each described equipment among the claim 9-16.
18. a communication system, it comprises at least one user equipment (UE) and according to the described base station node B of claim 17.
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| CN101674113A (en) * | 2008-09-08 | 2010-03-17 | 大唐移动通信设备有限公司 | Method and device for distributing Midamble code |
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- 2010-05-21 CN CN2010101855511A patent/CN102255704A/en active Pending
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| WO2005093968A1 (en) * | 2004-03-25 | 2005-10-06 | Koninklijke Philips Electronics N.V. | Method and apparatus for joint detection in downlink tdd cdma |
| CN101388683A (en) * | 2007-09-14 | 2009-03-18 | 中兴通讯股份有限公司 | Code channel detection method in CDMA system |
| CN101667859A (en) * | 2008-09-01 | 2010-03-10 | 大唐移动通信设备有限公司 | Method, system and device for data transmission |
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Application publication date: 20111123 |