CN101771435B - Multi-carrier aggregation system and method thereof for selecting uplink reference signals - Google Patents
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Abstract
The embodiment of the invention discloses a multi-carrier aggregation system and a method thereof for selecting uplink reference signals. The method comprises the step that UE (User Equipment) on each downlink member carrier in the same cell selects uplink reference signals in the same uplink reference signal sequence set. The system comprises the UE and a base station, wherein UE on each downlink member carrier in the same cell selects the uplink reference signals in the same uplink reference signal sequence set and transmits the signals to the base station; the base station receives the uplink reference signals transmitted by the UE and performs channel estimation according to the received uplink reference signal. The invention can improve the accuracy of channel estimation which is performed by the base station according to the uplink reference signals transmitted by the UE.
Description
Technical field
The present invention relates to the multi-carrier polymerizing communication technical field, relate in particular to the method for multi-carrier aggregation system and selection uplink reference signals thereof.
Background technology
Senior Long Term Evolution (LTE-Advanced) system is a kind of Novel movable communication system that grows up in Long Term Evolution (LTE) system-based, and it has adopted the multi-carrier polymerizing technology, is multi-carrier aggregation system.
Different from the LTE system is that multi-carrier aggregation system can be supported the system bandwidth wider than LTE system, for example, supports the bandwidth of 100MHz.Particularly, multi-carrier aggregation system couples together use by the resource with a plurality of member carriers, realizes supporting the system bandwidth wider than LTE system.
Multi-carrier aggregation system realizes that the method for carrier aggregation comprises: a plurality of continuous member carriers are carried out polymerization, perhaps, a plurality of discontinuous member carriers are carried out polymerization.
Fig. 1 is the multi-carrier polymerizing schematic diagram in the multi-carrier aggregation system, and as seen from Figure 1, the system bandwidth of the continuous carrier that is aggregated into by the member carrier of a plurality of dispersions is higher than the system bandwidth of the member carrier of any one dispersion.
In general, in the LTE system, the upstream bandwidth demand is suitable with the downlink bandwidth demand, and therefore, uplink member carrier is identical with the downlink member carrier number, also, and uplink member carrier that each downlink member carrier is corresponding.And in multi-carrier aggregation system, the downlink bandwidth demand is larger than upstream bandwidth demand, the number of downlink member carrier is greater than the number of uplink member carrier, multi-carrier aggregation system is supported the system bandwidth wider than LTE system by a plurality of downlink member carriers being carried out corresponding uplink member carrier after the polymerization.
In the LTE system, subscriber equipment (UE) can only be linked on the member carrier, in order to realize the system compatible with LTE, in multi-carrier aggregation system, also requires UE can only be linked on the member carrier in the multi-carrier aggregation system.Because in multi-carrier aggregation system, therefore the number of downlink member carrier, a plurality of UE may occur and be on the different downlink member carriers more than the number of uplink member carrier, still, they are linked into the situation of same uplink member carrier.
In multi-carrier aggregation system, in order to reduce the peak-to-average force ratio of descending moulding signal, need to be the different different cell IDs (Cell ID) of downlink member carrier configuration, because in multi-carrier aggregation system, the UE that is positioned on the different downlink member carriers may be linked on the same uplink member carrier, the different situation of Cell ID that each UE on the same uplink member carrier therefore, may occur.
Fig. 2 is the schematic diagram of two corresponding same uplink member carrier of downlink member carrier in the present multi-carrier aggregation system.
As shown in Figure 2, downlink member carrier 0 and downlink member carrier 1 equal corresponding uplink member carrier 0, wherein, the Cell ID of downlink member carrier 0 is PCI A, the Cell ID of downlink member carrier 1 is PCI B, as seen, the UE that existing corresponding Cell ID is PCI A on the up-link carrier 0, it is the UE of PCI B that corresponding Cell ID is arranged again.
In LTE system and multi-carrier aggregation system, UE needs the Cell ID according to its downlink member carrier that accesses, select corresponding uplink reference signals, the uplink reference signals of selecting is issued the base station, uplink channel estimation is carried out according to the uplink reference signals that UE sends in the base station, for example, estimate ascending control channel (Physical Uplink Control Channel, PUCCH), detectable signal (Sounding Reference Signal, SRS) channel and Uplink Shared Channel (Physical Uplink Shared Channel, PUSCH) etc.
Through constantly perfect, the LTE system has developed into LTE version 8(LTE Release8 at present) system.
In LTE version 8 systems, be set with altogether 30 uplink reference signals sequence set, its reference signal sequence group ID is respectively the integer in 0 to 29.UE is according to the Cell ID of its downlink member carrier of living in and current time slots number, from above-mentioned 30 uplink reference signals sequence set, in the selected uplink reference signals sequence set, from this selected uplink reference signals sequence set, select uplink reference signals to issue the base station.Particularly, UE selects the uplink reference signals sequence set according to formula 1:
u=(f
gh(n
s)+f
ss)mod 30 1
In the formula 1, u is uplink reference signals sequence set ID, i.e. root sequence index, f
Gh(n
s) be number to organize the root sequence index that frequency hopping (group hopping) obtains, f according to current time slots
SsThe displacement of uplink reference signals sequence set ID corresponding to different channels, n wherein
sIt is current time slots number.
Particularly, when group hopping opens,
When group hopping closes, f
Gh(n
s)=0, UE finishes the opening and closing of group hopping according to the indication of high-level signaling.Wherein, c (8n
s+ i) be j=8n among the pseudo random sequence c (j)
sThe element value of+i, for example, if pseudo random sequence c (j) is 011001,8n
s+ i=2, then c (8n
s+ i) value is second element value in the pseudo random sequence 011001, namely is 1.The initial value c of pseudo random sequence c (j)
InitFor
Wherein,
The Cell ID of UE place downlink member carrier, as seen, c
InitBy
Unique decision.Mod wherein represents modulo operation.
In the formula 1, for different up channels, f
SsValue different, particularly:
For the PUCCH channel, its uplink reference signals sequence displacement
For the PUSCH channel, its uplink reference signals sequence displacement
Wherein, Δ
Ss∈ 0,1 ..., 29}, that is, and Δ
SsAn integer between 0 to 29, Δ
SsConcrete value notify UE by high-level signaling.
In order to realize the compatibility with LTE version 8 systems, the design of each carrier wave in the multi-carrier aggregation system (being member's carrier wave) need to be identical with the design of carrier wave in LTE version 8 systems, can work at each member carrier of multi-carrier aggregation system with the terminal that guarantees LTE version 8, and multi-carrier aggregation system adopts the method identical with the LTE system to estimate up channel.
By such scheme as seen, to choose which uplink reference signals sequence set only relevant with the Cell ID of UE place downlink member carrier for UE.In LTE version 8 systems, the corresponding uplink member carrier of downlink member carrier, can guarantee that Cell ID corresponding to UE on the same uplink member carrier is identical, therefore, UE on the same uplink member carrier uses the uplink reference signals in the same uplink reference signals sequence set, the base station is distinguished each UE according to the uplink reference signals that UE sends by cyclic shift, and then carries out uplink channel estimation.Because the orthogonality in the same uplink reference signals sequence set between each uplink reference signals is better, therefore, the base station can distinguish each UE in the same up-link carrier preferably, thereby so that the accuracy of uplink channel estimation is higher.
In multi-carrier aggregation system, the uplink reference signals group that each UE selects is well-determined by the Cell ID of downlink member carrier, therefore, the requisite step that Cell ID is UE selection uplink reference signals is given for each downlink member carrier in the base station.At present, how Cell ID for downlink member carrier gives, also there is not at present concrete technical scheme, if arbitrarily give, the situation that then may occur is, when the UE in the same residential quarter on each downlink member carrier selected uplink reference signals at the Cell ID according to its place downlink member carrier, the uplink reference signals of selecting was from different uplink reference signals groups.
Because the orthogonality between the uplink reference signals in the different uplink reference signals sequence set is relatively poor, therefore, it is relatively poor that the accuracy of each UE in the same up-link carrier is distinguished in the base station, thereby the accuracy that causes carrying out uplink channel estimation is relatively poor.
Summary of the invention
In view of this, the method that the purpose of the embodiment of the invention is to provide a kind of multi-carrier aggregation system and selects uplink reference signals is to improve the accuracy of base station estimation up channel.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
A kind of multi-carrier aggregation system is selected the method for uplink reference signals, and the method comprises:
UE is the Cell ID of himself the place downlink member carrier number delivery to the uplink reference signals sequence set, selects uplink reference signals from uplink reference signals sequence set ID is described delivery result's uplink reference signals sequence set;
Base station the coming to the same thing to the number delivery of uplink reference signals sequence set that be each downlink member carrier is given in the described same residential quarter Cell ID.
A kind of multi-carrier aggregation system, this system comprises UE and base station;
UE in the same residential quarter on each different downlink member carrier selects the uplink reference signals in the same uplink reference signals sequence set to issue the base station;
The base station receives the uplink reference signals that UE sends, and carries out channel estimating according to the uplink reference signals that receives;
Wherein, UE is the Cell ID of himself the place downlink member carrier number delivery to the uplink reference signals sequence set, selects uplink reference signals from uplink reference signals sequence set ID is described delivery result's uplink reference signals sequence set;
The base station is that each downlink member carrier is given Cell ID in the same residential quarter, and guarantees the Cell ID give coming to the same thing to the number delivery of uplink reference signals sequence set.
As seen from the above technical solution, because the UE in the same residential quarter on each different downlink member carrier selects the uplink reference signals in the same uplink reference signals sequence set, and has preferably orthogonality between the uplink reference signals from same uplink reference signals sequence set, therefore, the accuracy of channel estimating can be provided.
Description of drawings
Fig. 1 is the multi-carrier polymerizing schematic diagram in the multi-carrier aggregation system;
Fig. 2 is the schematic diagram of two corresponding same uplink member carrier of downlink member carrier in the present multi-carrier aggregation system;
Fig. 3 is the method flow diagram that multi-carrier aggregation system of the present invention is selected uplink reference signals;
Fig. 4 is that multi-carrier aggregation system provided by the invention forms schematic diagram.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, referring to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
Core concept of the present invention is: guarantee that the UE on the different downlink member carriers in the same residential quarter chooses the uplink reference signals in the same uplink reference signals sequence set, because the orthogonality between the uplink reference signals in the same uplink reference signals sequence set is better, therefore, can improve the accuracy of carrying out channel estimating.
Particularly, UE selects uplink reference signals to carry out channel estimating from each uplink reference signals sequence set according to the cell ID Cell ID of himself place downlink member carrier, wherein, the base station is the Cell ID that gives of each downlink member carrier in the same residential quarter in order to guarantee that uplink reference signals that UE selects according to described Cell ID is from same uplink reference signals sequence set.
Again further particularly, UE selects the method for uplink reference signals to be from each uplink reference signals sequence set according to the Cell ID of himself place downlink member carrier: UE is the Cell ID of himself the place downlink member carrier number delivery to the uplink reference signals sequence set, selects uplink reference signals from uplink reference signals sequence set ID is described delivery result's uplink reference signals sequence set; The method of giving Cell ID for each downlink member carrier in the same residential quarter comprises: for each downlink member carrier in the same residential quarter is given Cell ID, so that the Cell ID that gives for described each downlink member carrier coming to the same thing to the number delivery of uplink reference signals sequence set.
According to the difference of carrying out the effect that channel estimating obtains for different channels, the present invention can have different embodiment, and the below is explained respectively the present invention for two example two.Wherein, when the first embodiment carries out channel estimating for PUCCH channel and SRS channel, under any circumstance can both guarantee to carry out uplink reference signals that channel estimating utilizes from same uplink reference signals sequence set, therefore, the effect of carrying out channel estimating for PUCCH channel and SRS channel is better, but when carrying out channel estimating for the PUSCH channel, can guarantee that the uplink reference signals length determined at UE more in short-term, generally exists
The time, carry out uplink reference signals that channel estimating utilizes from same uplink reference signals sequence set, and when uplink reference signals length is longer, can not guarantee to carry out uplink reference signals that channel estimating utilizes from same uplink reference signals sequence set, therefore, carry out the reference signal length that channel estimating is utilized for the PUSCH channel
When longer, the effect of carrying out channel estimating is not as more in short-term effective of the length of the reference signal of carrying out channel estimating for the PUSCH channel and utilizing, wherein,
Reference signal length,
Be the number of sub carrier wave in the Resource Block, UE can pre-determine
The second embodiment carries out channel estimating for PUCCH, SRS and/or PUSCH channel.In the first embodiment and the second embodiment, the number of uplink reference signals sequence set is 30.
The first embodiment:
In the present embodiment, give Cell ID for each downlink member carrier of same residential quarter in advance, the Cell ID that gives for each downlink member carrier in the same residential quarter comes to the same thing to number (being 30 in the present embodiment) delivery of uplink reference signals, and, select uplink reference signals to carry out in the process of channel estimating at UE, high-level signaling indication UE closes group hopping, to guarantee that UE goes in the choice reference signal and carries out in the process of channel estimating, the uplink reference signals of the UE selection on each downlink member carrier same residential quarter in is all the time from same uplink reference signals sequence set.
For example, the Cell ID of each downlink member carrier in a certain residential quarter being given respectively is 0,30,60 ... be 1,31,61 and the Cell ID of each downlink member carrier in another residential quarter is given respectively
Fig. 3 is the method flow diagram that multi-carrier aggregation system of the present invention is selected uplink reference signals, and as shown in Figure 3, this flow process comprises:
Particularly, in the present embodiment, for realizing the compatibility of multi-carrier aggregation system and LTE system, multi-carrier aggregation system also carries out uplink reference signals according to formula 1 to be selected, that is, according to
U=(f
Gh(n
s)+f
Ss) mod30 formula 1
Carry out uplink reference signals and select, and close group hopping according to high-level signaling, because UE has closed group hopping, therefore,
f
gh(n
s)=0，
U=(f then
Gh(n
s)+f
Ss) mod30=f
SsMod30
For the PUCCH channel:
For the PUSCH channel:
Δ wherein
Ss∈ 0,1 ..., and 29} is given by high level, in same residential quarter, and Δ
SsGet identical value.
Every group of reference signal sequence can also be divided into basic sequence in two groups, and the basic sequence numbering is respectively 0 and 1 in the group, can represent to organize interior basic sequence numbering with v.Usually, during greater than predetermined length, existing UE need to carry out sequence hopping (sequence hopping) when going in the choice reference signal, namely in reference signal length, in the reference signal sequence group of selecting, select basic sequence in the group, in this group, select uplink reference signals in the basic sequence.
Usually, exist
UE need to carry out sequence hopping.
Particularly, exist
The time, basic sequence is numbered v=0 in the group of choosing;
The time, being numbered of basic sequence in the group of choosing: when group hopping closes and sequence hopping when opening, v=c (ns), in other cases, v=0, that is:
Wherein, c (ns) is the element value of selecting from pseudo random sequence according to the value of current time slots ns, wherein, at each radio frames initial time, described pseudo random sequence is carried out initialization, and the initial value of this pseudo random sequence is
The second embodiment:
The difference of present embodiment and the first embodiment only is that present embodiment has further been closed sequence hopping on the basis of closing group hopping.In this case, no matter the length of reference signal how, all selects uplink reference signals the basic sequence in the group of v=0.The uplink reference signals that adopts the second embodiment to select not only can improve the accuracy of carrying out PUCCH channel and SRS channel estimating, can also improve the accuracy of carrying out the PUSCH channel estimating.
The below provides multi-carrier aggregation system embodiment provided by the invention.
Fig. 4 is that multi-carrier aggregation system provided by the invention forms schematic diagram, and as shown in Figure 4, this system comprises UE401 and base station 402.
UE401 in the same residential quarter on each downlink member carrier selects the uplink reference signals in the same uplink reference signals sequence set to issue base station 402.
Particularly, UE401 is the Cell ID of himself the place downlink member carrier number delivery to the uplink reference signals sequence set, selects uplink reference signals from uplink reference signals sequence set ID is described delivery result's uplink reference signals sequence set.
Cell ID is given for each downlink member carrier in the same residential quarter in base station 402, and the Cell ID that gives of assurance coming to the same thing to the number delivery of uplink reference signals sequence set.
This system can further include high-level signaling dispensing device 403, is used for being sent in the high-level signaling that the process of selecting uplink reference signals is closed group hopping or group hopping and sequence hopping to UE401.
UE401 goes in the choice and closes group hopping according to high-level signaling in the process of reference signal, and PUCCH channel estimating and/or SRS channel estimating and/or PUSCH channel estimating are carried out according to the uplink reference signals that UE401 sends in base station 402.
Perhaps, UE401 goes in the choice and closes group hopping and sequence hopping according to high-level signaling in the process of reference signal, and PUCCH channel estimating and/or SRS channel estimating and/or PUSCH channel estimating are carried out according to the uplink reference signals that UE sends in base station 402.
As seen from the above technical solution, because the UE in the same residential quarter on each downlink member carrier selects the uplink reference signals in the same uplink reference signals sequence set, and has preferably orthogonality between the uplink reference signals from same uplink reference signals sequence set, therefore, the accuracy of channel estimating can be provided.
The present invention is according to the method for selecting uplink reference signals from each uplink reference signals sequence set, the Cell ID that gives for each downlink member carrier in the same residential quarter has guaranteed that uplink reference signals that UE selects according to described Cell ID is from same uplink reference signals sequence set, and has preferably orthogonality between the uplink reference signals from same uplink reference signals sequence set, therefore, the accuracy of channel estimating can be provided.
Because the present invention has taken into full account the compatibility of multi-carrier aggregation system and existing LTE system, in not changing the LTE system, select on the basis of algorithm of uplink reference signals, by giving suitable Cell ID for each downlink member carrier in the same residential quarter, guarantee that the UE on each downlink member carrier in the same residential quarter belongs to same uplink reference signals group according to the uplink reference signals that this Cell ID selects, and by closing group hopping, perhaps close group hopping and sequence hopping, guarantee to select uplink reference signals to carry out in the process of channel estimating at UE, UE on each downlink member carrier in the same residential quarter selects uplink reference signals all the time in same uplink reference signals group, thereby improves the accuracy of channel estimating.
The above is preferred embodiment of the present invention only, is not for limiting protection scope of the present invention, all any modifications of making within the spirit and principles in the present invention, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a multi-carrier aggregation system is selected the method for uplink reference signals, it is characterized in that the method comprises:
User equipment (UE) in the same residential quarter on each downlink member carrier is selected the uplink reference signals in the same uplink reference signals sequence set, wherein:
UE is the Cell ID of himself the place downlink member carrier number delivery to the uplink reference signals sequence set, selects uplink reference signals from uplink reference signals sequence set ID is described delivery result's uplink reference signals sequence set;
Base station the coming to the same thing to the number delivery of uplink reference signals sequence set that be each downlink member carrier is given in the described same residential quarter Cell ID;
The uplink reference signals that UE in the same residential quarter on each downlink member carrier will select is separately issued the base station;
Channel estimating is carried out according to the uplink reference signals that receives in the base station.
2. the method for claim 1 is characterized in that,
Described UE selects uplink reference signals to comprise from each uplink reference signals sequence set according to the Cell ID of himself place downlink member carrier: UE goes in the choice according to the notice of high-level signaling and closes group frequency hopping group hopping in the process of reference signal;
The described channel estimating of carrying out comprises: carry out ascending control channel PUCCH channel estimating and/or detectable signal SRS channel estimating and/or Uplink Shared Channel PUSCH channel estimating.
3. method as claimed in claim 2 is characterized in that,
Described UE selects uplink reference signals to comprise from each uplink reference signals sequence set according to the Cell ID of himself place downlink member carrier: UE goes in the choice according to the notice of high-level signaling and closes group frequency hopping group hopping and sequence hopping sequence hopping in the process of reference signal.
4. the method for claim 1 is characterized in that, the number of described uplink reference signals sequence set is 30.
5. a multi-carrier aggregation system is characterized in that, this system comprises UE and base station;
UE in the same residential quarter on each downlink member carrier selects the uplink reference signals in the same uplink reference signals sequence set to issue the base station;
The base station receives the uplink reference signals that UE sends, and carries out channel estimating according to the uplink reference signals that receives;
Wherein, UE is the Cell ID of himself the place downlink member carrier number delivery to the uplink reference signals sequence set, selects uplink reference signals from uplink reference signals sequence set ID is described delivery result's uplink reference signals sequence set;
The base station is that each downlink member carrier is given Cell ID in the same residential quarter, and guarantees the Cell ID give coming to the same thing to the number delivery of uplink reference signals sequence set.
6. system as claimed in claim 5 is characterized in that, this system further comprises the high-level signaling dispensing device;
Described high-level signaling dispensing device is used for being sent in the high-level signaling that the process of selecting uplink reference signals is closed group hopping or group hopping and sequence hopping to UE;
UE goes in the choice and closes group hopping or close group hopping and sequence hopping according to high-level signaling in the process of reference signal, and PUCCH channel estimating and/or SRS channel estimating and/or PUSCH channel estimating are carried out according to the uplink reference signals that UE sends in the base station.
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| CN102064922B (en) * | 2011-01-07 | 2013-02-20 | 大唐移动通信设备有限公司 | Method and equipment for transmitting uplink control information |
| CN102223726A (en) * | 2011-06-10 | 2011-10-19 | 中兴通讯股份有限公司 | Method and system for sending SRS (survey reference signal) |
| US8693420B2 (en) * | 2011-08-10 | 2014-04-08 | Futurewei Technologies, Inc. | System and method for signaling and transmitting uplink reference signals |
| KR102210081B1 (en) * | 2012-05-11 | 2021-02-01 | 팬텍 주식회사 | Method and Apparatus for Transmitting and Receiving Reference Signal in Wireless Communication System |
| CN105519181B (en) * | 2013-09-25 | 2019-09-27 | 日电（中国）有限公司 | Method and apparatus for the uplink data transmission in wireless communication system |
| CN107439047B (en) * | 2015-04-06 | 2021-06-08 | Lg电子株式会社 | Method for transmitting and receiving signal based on shared resource in wireless communication system and apparatus therefor |
| US10594454B2 (en) | 2016-01-20 | 2020-03-17 | Nec Corporation | Methods and apparatuses for transmitting a reference signal |
| US10735156B2 (en) * | 2016-03-24 | 2020-08-04 | Qualcomm Incorporated | Sounding reference signal transmission for enhanced carrier aggregation |
| CN107819497A (en) * | 2016-09-12 | 2018-03-20 | 中兴通讯股份有限公司 | Space division multiplexing method, device and base station based on carrier aggregation |
| CN111373814B (en) * | 2017-11-17 | 2021-11-02 | 中兴通讯股份有限公司 | Reference signal configuration |
| CN109803417B (en) * | 2017-11-17 | 2021-02-09 | 维沃移动通信有限公司 | Method for determining reference signal, method and equipment for sending uplink sounding reference signal |
| CN110049510B (en) * | 2018-01-16 | 2021-01-15 | 中国移动通信有限公司研究院 | Cross link interference measurement notification method, network side equipment and mobile communication terminal |
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