CN101388686A - Method and device implementing downlink pilot under coexistence of uni-cast and broadcast multicast service - Google Patents
Method and device implementing downlink pilot under coexistence of uni-cast and broadcast multicast service Download PDFInfo
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Abstract
The invention discloses a method for realizing downlink pilot when UNICAST business and MBMS business coexist and a device thereof. A mobile communication system comprises a UNICAST business layer and an MBMS business layer, wherein cellular structures of the two business layers are superposed. On the UNICAST business layer, each cell base station in a plurality of neighboring cells utilizes different scrambling codes to disturb an orthogonal sequence, a pilot sequence is generated and is sent on a downlink pilot communication channel, on the MBMS business layer, each cell base station in a plurality of neighboring cells utilizes scrambling codes which are different from the UNICAST business layer to disturb the orthogonal sequence, and the pilot sequence is generated and is sent on a downlink pilot communication channel. Thereby the invention provides an MBMS business layer downlink pilot sending scheme which is more easily realized, and the disturbance of the MBMS business layer downlink pilot to the UNICAST business layer can be minimized simultaneously.
Description
Technical field
The present invention relates to the pilot transmission technology in the wireless communication system, relate in particular to the method and apparatus of realizing descending pilot frequency when a kind of clean culture (UNICAST) is professional to coexist with multimedia broadcast-multicast service (MBMS).
Background technology,
In wireless communication system, the data that send are handled on transmitter, as coding and modulation, obtain radio frequency (RF) modulated signal through up-conversion then, and the RF modulated signal is transmitted on wireless channel and arrived receiver by a plurality of propagation paths.The characteristic of propagation path changes at any time because of multiple factor usually, and said here factor is such as decay, multipath and external disturbance.Therefore, the RF modulated signal of transmission may experience the different channels condition, for example different decay and multipath effect, and be changing in time.Therefore, need transmitter (as the base station) to send pilot tone to receiver (as subscriber equipment), help receiver to obtain original transmission data, such as pilot tone can be used for that channel estimating, timing and frequency on the receiver obtained, coherence data demodulation, signal strength measurement etc.
The pilot transmission schemes design faces multiple challenge.A kind of consideration is that pilot transmission needs occupying system resources, is expense in the system, and estimated performance still is provided when wishing to simplify pilot transmission as far as possible most.Another kind of consider be the design of pilot frequency sequence to make intrasystem receiver to detect and distinguishing system in the pilot tone that sends of each transmitter, just minimize between the pilot tone that the multi-cell system frequency reuse brings and disturb.
When in existing mobile communication system, realizing the UNICAST business, realize the MBMS business, a MBMS operation layer is set in comprising the existing Radio Access Network of UNICAST operation layer, the locations of structures of the sub-district of MBMS operation layer is identical with the locations of structures of original UNICAST operation layer sub-district, so the sub-district of these two operation layers overlaps fully.
For the UNICAST operation layer, come the Pilot Interference of randomize inter-cell and be used for each pilot tone of identification in descending employing sub-district specific scramble codes (cell-specificscrambling code) from which sub-district, scrambler can be pseudo random sequence or some other unique sequences, and this has overcome presence of intercell interference to a certain extent.Because OFDM (OFDM, Orthogonal Frequency DivisionMultiplexing) system's frequency reuse, each pilot sub-carrier is interfered in the minizone, if the user is in the minizone at this moment, because presence of intercell interference exists, channel estimating can not be improved well.At present, in the LTE system, adopt the thought of bidimensional pilot tone to generate the descending pilot frequency sequence, promptly multiply each other and obtain new sequence and launch as final pilot frequency sequence with orthogonal sequence and pseudo random sequence, than adopting sub-district specific scramble codes (cell-specific scrambling code) to have lower cross-correlation coefficient separately, further overcome presence of intercell interference.But prior art does not provide the concrete generative process that orthogonal sequence and pseudo random sequence specifically adopt which type of sequence and pilot frequency sequence.
Because the UNICAST of same cell/section takies different time slots with the MBMS business, and the UNICAST of different districts/sector and MBMS business can take same time slot, so the pilot tone between these two operation layers may interfere with each other, therefore face a problem of when UNICAST and MBMS coexistence, how to carry out pilot transmission.(cell-specific scrambling code) carries out scrambling if the MBMS operation layer also adopts the sub-district specific scramble codes, bring complexity then for the MBMS pilot tone, because the business of each sub-district of MBMS all is identical, and does not disturb the minizone when carrying out the MBMS business, so, the present invention when having satisfied the low demand of complexity, has solved the problem of MBMS operation layer pilot transmission according to this characteristic of MBMS business.
Summary of the invention
The technical problem to be solved in the present invention provides the method and apparatus of realizing descending pilot frequency when a kind of UNICAST is professional to coexist with MBMS is professional, the MBMS operation layer descending pilot frequency that is more prone to realize delivery plan is provided, has minimized of the interference of MBMS operation layer descending pilot frequency simultaneously the UNICAST operation layer.
On the one hand, the present invention realizes the method for descending pilot frequency when proposing a kind of clean culture and broadcasting multicast service coexistence, and mobile communication system comprises unicast service layer and broadcasting multicast service layer, and described two operation layer cell structures overlap, wherein:
On the unicast service layer, the base station of each sub-district utilizes different scramblers to the orthogonal sequence scrambling in a plurality of neighbor cells, and the generation pilot frequency sequence also sends on downlink pilot frequency channel;
On the broadcasting multicast service layer, the base station of each sub-district utilizes a scrambler that is different from single each scrambler of ripple operation layer to the orthogonal sequence scrambling in a plurality of neighbor cells, and the generation pilot frequency sequence also sends on downlink pilot frequency channel.
In the said method, on the unicast service layer, the base station of described each sub-district pilot frequency sequence that each sector sends in this sub-district is by generating after the different orthogonal sequence scramblings.
In the said method, on the broadcasting multicast service layer, generate after the base station of described each sub-district pilot frequency sequence that each sector sends in this sub-district adopts same orthogonal sequence scrambling, and this orthogonal sequence is different from the orthogonal sequence that adopt each sector of single ripple operation layer.
In the said method, described mobile communication system is an ofdm system, and described orthogonal sequence is the number according to pilot sub-carrier in the system bandwidth, the sequence of the respective length that obtains after Walsh Walsh code weight is answered.
In the said method, the length of described Walsh Walsh sign indicating number is 4.
In the said method, the generative process of described scrambler may further comprise the steps:
Step a, according to the number of available subcarrier in the system bandwidth, a plurality of Gold sign indicating numbers of selecting respective length are respectively as the scrambler of each neighbor cell;
Step b takes out the scrambler that forms the respective cell downlink pilot frequency channel with the same number of chip of pilot sub-carrier respectively from described scrambler.
In the said method, step b takes out the scrambler of preceding L the chip identical with pilot sub-carrier number L as described downlink pilot frequency channel from described scrambler.
On the other hand, the present invention proposes the base station in a kind of mobile communication system, and described mobile communication system comprises a plurality of neighbor cells, and this base station is positioned at one of them sub-district, and described base station comprises with lower module:
Unicast service descending pilot frequency sending module, be used to utilize the scrambler of distributing to this sub-district unicast service layer to the orthogonal sequence scrambling, generate pilot frequency sequence and also send on downlink pilot frequency channel, the base station in described scrambler and the described a plurality of neighbor cells in other sub-districts is used for to the scrambler of pilot channel scrambling different;
Broadcasting multicast service descending pilot frequency sending module, be used to utilize the scrambler of distributing to this Cell Broadcast CB multicast service layer to the orthogonal sequence scrambling, the generation pilot frequency sequence also sends on downlink pilot frequency channel, and described scrambler is different with the scrambler that described a plurality of neighbor cell unicast service layers adopt.
In the above-mentioned base station, described unicast service descending pilot frequency sending module adopts different orthogonal sequences to generate pilot signal to each sector in this sub-district.
In the above-mentioned base station, the orthogonal sequence that adopt each sector of orthogonal sequence and unicast service layer that described broadcasting multicast service descending pilot frequency sending module adopts is different.
In the above-mentioned base station, described mobile communication system is an ofdm system, and described unicast service descending pilot frequency sending module and broadcasting multicast service descending pilot frequency sending module further comprise:
The orthogonal sequence generation unit is used for according to the number of pilot sub-carrier in the system bandwidth Walsh Walsh sign indicating number being carried out repetition, generates the sequence of respective length.
In the above-mentioned base station, the length of the Walsh Walsh sign indicating number that described orthogonal sequence generation unit uses is 4.
In the above-mentioned base station, described unicast service descending pilot frequency sending module and broadcasting multicast service descending pilot frequency sending module further comprise:
The scrambler dispensing unit, be used to dispose the scrambler of pilot channel, the scrambler of described pilot channel generates in the following manner: the Gold sign indicating number of selecting respective length according to the number of available subcarrier in the system bandwidth is respectively as the scrambler of each neighbor cell, and takes out the scrambler that forms the respective cell downlink pilot frequency channel with the same number of chip of pilot sub-carrier from described scrambler respectively.
Advantage and characteristics that the present invention is main are as follows:
1. the MBMS operation layer descending pilot frequency that is more prone to realize delivery plan is provided, has simplified the handling process of receiving terminal, improved the efficient of channel estimating;
2. the present invention adopts orthogonal code to multiply by the two-dimension pilot frequency sequence that scrambler generates, for the UNICAST business realizing frequency domain quadrature and the less correlation of minizone descending pilot frequency of descending pilot frequency in the sub-district, realized simultaneously in UNICAST operation layer and the MBMS operation layer descending pilot frequency sub-district and the frequency domain quadrature of minizone, therefore improved the reliability of channel estimating.
Description of drawings
Fig. 1 is the professional flow chart of realizing the method for descending pilot frequency during with the professional coexistence of MBMS of the UNICAST that proposes of the present invention;
Fig. 2 illustrates the idiographic flow of step 1 among Fig. 1;
Fig. 3 (a) is that orthogonal sequence distributes schematic diagram, and Fig. 3 (b) is that interior scrambler distributes schematic diagram, and Fig. 3 (c) is that outer scrambler distributes schematic diagram;
Fig. 4 illustrates the composition structure of the transmitter of the described base station of present embodiment;
Fig. 5 illustrates the process that UE receives the UNICAST business datum
Fig. 6 illustrates the process that UE receives the MBMS business datum.
Embodiment
In order to realize the coexistence of clean culture in the wireless communication system (UNICAST) business and multimedia broadcast-multicast service (MBMS), the present invention specializes UNICAST operation layer descending pilot frequency transmission plan, and has provided the implementation of MBMS operation layer descending pilot frequency transmission on the basis of the UNICAST operation layer descending pilot frequency transmission plan of having specialized.
The cell structure that overlaps fully based on UNICAST operation layer in the wireless communication system and MBMS operation layer, take different time slots in same sector UNICAST business with the MBMS business, so MBMS operation layer and the shared downlink pilot frequency channel of UNICAST operation layer can certainly be provided with an independently downlink pilot frequency channel for the MBMS operation layer.Because the MBMS business is identical in certain zone, therefore each cell/section of MBMS operation layer can adopt identical pilot frequency sequence, but in order to distinguish the professional and MBMS business of UNICAST, what the pilot frequency sequence of MBMS operation layer employing should be with the UNICAST operation layer is different.
With reference to Fig. 1, the UNICAST business that the present invention proposes realizes that the method for descending pilot frequency mainly may further comprise the steps when coexisting with MBMS is professional:
Step 3, receiving terminal utilizes this cell downlink of UNICAST operation layer pilot signal to carry out processing such as channel estimating when receiving the UNICAST business; When receiving the MBMS business, utilize the combined signal of each cell downlink pilot signal of MBMS operation layer to carry out processing such as channel estimating.
For each cell/section of UNICAST operation layer and MBMS operation layer, the descending pilot frequency sequence that a part of subcarrier is used for carrying this cell/section in each sub-carrier in OFDM (OFDM) system is promptly as downlink pilot frequency channel; Another part subcarrier is used for carrying the downlink data of this cell/section, promptly as downstream data channel.
Below, the generation and the assigning process of the pilot frequency sequence that transmits on the downlink pilot frequency channel of these two each cell/sections of operation layer are described with reference to Fig. 2.At this, with 170 sub-districts, one 510 sectors in the ofdm system bunch be example, be in any two sub-districts in the cluster and all be considered to neighbor cell.The sequence that obtains after utilizing orthogonal sequence and scrambler to multiply each other is as the descending pilot frequency sequence of UNICAST business and MBMS business.
1) at the UNICAST operation layer, with the different sectors in the orthogonal sequence distinguishing cell.Because each sub-district comprises 3 sectors among this embodiment, therefore from being 4 Walsh sign indicating number, length select 3 orthogonal sequences as basic orthogonal sequences, specific as follows:
W
1(n)＝[11-1-1]，
W
2(n)＝[1-11-1]，
W
3(n)＝[1-1-11]。
Pilot sub-carrier number as required is copied into the orthogonal sequence of respective length, i.e. sequence length L=N respectively with each basic orthogonal sequences
u/ N
f, N wherein
uBe available subcarrier number in the system bandwidth, N
fBe the pilot interval on the frequency direction, the then last orthogonal sequence structure that generates is:
W1＝[11-1-1，11-1-1，......，11-1-1]，
W2＝[1-11-1，1-11-1，......，1-11-1]，
W3＝[1-1-11，1-1-11，......，1-1-11]。
Orthogonal sequence W1～the W3 that generates is distributed to 3 sectors of each sub-district, and Fig. 3 (a) illustrates wherein a kind of distribution condition.
2) at the MBMS operation layer, be to select an orthogonal sequence that is different from the UNICAST operation layer 4 the Walsh sign indicating number from length as basic orthogonal sequences, specific as follows:
W
4(n)＝[1111]。
Similar with UNICAST operation layer orthogonal sequence generative process, the basic orthogonal sequence of 4 chip lengths is duplicated, and generates the long orthogonal sequence of L chip, and is as follows:
W＝[1111，1111，......，1111]。
This in step select length be 4 Walsh sign indicating number as basic orthogonal sequences, be because basic orthogonal sequences more short weight can obtain the orthogonal sequence of many more different lengths after multiple.Owing to need the orthogonal sequence length of generation to depend on the resource situation of communication system, use the less basic orthogonal sequences of length to duplicate and can be applicable to more communication system, the Walsh sign indicating number that also can adopt other length in fact here is as basic orthogonal sequences.
1) the UNICAST operation layer adopts the different districts of sub-district specific scramble codes (cell-specific scrambling code) in distinguishing bunch, and therefore selecting 170 length from the Gold sign indicating number is N
uSequence as interior scrambler S1～S170.170 sub-districts during interior scrambler S1～S17 distributed to bunch correspondingly, Fig. 3 (b) is that example illustrates a kind of distribution condition with 7 sub-districts wherein.
Get preceding L chip of scrambler in each, obtain 170 scramblers that length is L, be used for the scrambling downlink pilot frequency channel.
2) the MBMS operation layer adopts the public scrambler in sub-district (cell-common scrambling code), and selecting 1 length from the Gold sign indicating number is N
uSequence as outer scrambler S, outer scrambler is not as long as repeat with interior scrambler.170 sub-districts during outer scrambler S distributed to bunch, Fig. 3 (c) is that example illustrates distribution condition with 7 sub-districts wherein.
Get preceding L chip of this outer scrambler, obtain 1 scrambler that length is L, be used for the downlink pilot frequency channel of scrambling MBMS operation layer.
In this step, be not limited to get preceding L chip of outer scrambler and interior scrambler, also can get L the chip in back or therefrom get L chip or the like arbitrarily.In addition, sub-district specific scramble codes (cell-specificscrambling code) is for the interference between the randomization different districts, and the public scrambler in sub-district (cell-common scrambling code) is to carry out each sub-district of MBMS business and other carry out the interference of each sub-district of UNICAST business for randomization.
1) at the UNICAST operation layer, with distributing to preceding L the chip (below be also referred to as the pilot channel scrambler) of the interior scrambler of a sub-district and distributing to that 3 orthogonal sequence W1, W2, W3 of 3 sectors multiply each other respectively in this sub-district, obtain 3 sector descending pilot frequency sequences separately in this sub-district.Therefore, distribute to 170 sub-districts 170 pilot channel scramblers each all multiply each other respectively with W1, W2, W3, constitute 510 descending pilot frequency sequences.
2) at the MBMS operation layer, L chip before the outer scrambler (below be also referred to as the pilot channel scrambler) and W are multiplied each other, obtain the descending pilot frequency sequence of 1 sequence as 510 included sectors of 170 sub-districts.
As seen, adopt this orthogonal code to multiply by the bidimensional pilot frequency sequence of scrambler, for the UNICAST business realizing frequency domain quadrature and the less correlation of minizone descending pilot frequency of descending pilot frequency in the sub-district, realized simultaneously in UNICAST operation layer and the MBMS operation layer descending pilot frequency sub-district and the frequency domain quadrature of minizone, therefore improved the reliability of channel estimating.
Fig. 4 illustrates the composition structure of the described base station of present embodiment.Increased a MBMS service pilot sending module in the base station, shown in frame of broken lines among Fig. 4, be used to utilize the scrambler of distributing to this Cell Broadcast CB multicast service layer to the orthogonal sequence scrambling, the generation pilot frequency sequence also sends on downlink pilot frequency channel.Original UNICAST service pilot sending module in this base station is improved, distribute to the scrambler of this sub-district unicast service layer carries out scrambling to orthogonal sequence function to realize utilization.
This MBMS service pilot sending module and this UNICAST service pilot sending module all comprise orthogonal sequence generation unit, chnnel coding unit, modulating unit, subcarrier map unit, scrambler dispensing unit, scrambling unit, inverse fourier transform unit or the like, here, scrambling unit can adopt multiplier or similar device to realize.Wherein, the orthogonal sequence generation unit, being used for according to the number of pilot sub-carrier in the system bandwidth is that 4 Walsh Walsh sign indicating number carries out repetition to length, generates the sequence of respective length; The scrambler dispensing unit, be used to dispose the scrambler of pilot channel, the scrambler of described pilot channel generates in the following manner: select the Gold sign indicating number of respective length according to the number of available subcarrier in the system bandwidth, and take out the scrambler that forms described pilot channel with the same number of chip of pilot sub-carrier respectively from described each Gold sign indicating number.
Need to prove, it in the MBMS service pilot sending module module in logic, on entity, realize entity of units shared of corresponding function in the chnnel coding unit that it adopts, modulating unit, subcarrier map unit, scrambling unit, inverse fourier transform IFFT unit etc. and the UNICAST service pilot sending module.
The base station of cell i need be in this sub-district the subscriber equipment (UE) in the j of sector when sending data, at first, be that UNICAST or MBMS determine the descending pilot frequency sequence that adopted according to this UE present located business among the j of sector.If UNICAST business, after then chnnel coding, modulation and subcarrier mapping are carried out to the orthogonal sequence Wj that distributes to sector j in the base station, the UNICAST service pilot channel scrambler that cell i is distributed in utilization carries out scrambling, and the pilot signal that obtains is launched on pilot channel through processing such as inverse fourier transform back.If the MBMS business after then chnnel coding, modulation and subcarrier mapping are carried out to orthogonal sequence W in the base station, utilizes MBMS service pilot channel scrambler to carry out scrambling, the pilot signal that obtains is launched on pilot channel through processing such as inverse fourier transform back.
In the j of the sector of cell i, if a UE is in the UNICAST business, the process that this UE receives the UNICAST business datum as shown in Figure 5, concrete steps are as follows:
Steps A 1 receives UNICAST service pilot signal from this sector downlink pilot frequency channel, and utilizes the pilot signal of receiving that this sector UNICAST service pilot channel is carried out channel estimating;
Steps A 2, the scrambler that comprises according to the pilot signal of receiving is preceding L the chip of interior scrambler Si, receives the UNICAST business datum of this sector, again in conjunction with the UNICAST business datum that the descrambling as a result and the demodulation of this sector pilot channel estimation are received.
During reception, can also further reduce interference in conjunction with interference cancellation techniques.UE receives UNICAST service pilot signal from each interference sector downlink pilot frequency channel, and the pilot signal that utilization is received from each interference sector is carried out channel estimating to respective sectors respectively, receive MBMS service pilot signal and merge from each interference sector downlink pilot frequency channel simultaneously, utilize the pilot signal that merges that channel of the equivalent one-tenth of the MBMS service pilot channel of these interference sectors is carried out channel estimating, from this sector signals of receiving, deduct these interference according to result to interference sector UNICAST business and MBMS service pilot channel estimating.
In the j of the sector of cell i, if a UE is in the MBMS business, then this UE receive the MBMS business datum process as shown in Figure 6, concrete steps are as follows:
Step B1 receives MBMS service pilot signal and merges from this sector and adjacent sectors downlink pilot frequency channel, utilizes the pilot signal that merges to become a channel to carry out channel estimating the MBMS service pilot channel equivalence of this sector and adjacent sectors;
Step B2, the scrambler that comprises according to the pilot signal of receiving is preceding L the chip of outer scrambler S, receive the MBMS business datum and merge from this sector and adjacent sectors, the MBMS business datum after merging in conjunction with the descrambling as a result of the pilot channel estimation that this sector and adjacent sectors equivalence are formed and demodulation again.
During reception, can also further reduce interference in conjunction with interference cancellation techniques.UE receives UNICAST service pilot signal from each interference sector downlink pilot frequency channel, and utilize the pilot signal of receiving from each interference sector respectively respective sectors to be carried out channel estimating, from this sector signals of receiving, deduct these interference according to result to interference sector UNICAST service pilot channel estimating.
As seen when receiving, pilot signal for the MBMS operation layer needn't be carried out channel estimating respectively according to different sectors, but handle together as a whole, as sector pilot signals of UNICAST operation layer is carried out channel estimating, the handling process of therefore having saved receiving terminal has improved the efficient of channel estimating.
The present invention discloses with aforesaid preferred embodiment, this is not in order to limit the present invention in order to clearly demonstrate technical scheme just, any those skilled in the art, without departing from the spirit and scope of the present invention, the modification of being done all is included in the application's the scope.
Claims (13)
- Realize the method for descending pilot frequency when 1, a kind of clean culture and broadcasting multicast service coexist, mobile communication system comprises unicast service layer and broadcasting multicast service layer, and described two operation layer cell structures overlap, and it is characterized in that:On the unicast service layer, the base station of each sub-district utilizes different scramblers to the orthogonal sequence scrambling in a plurality of neighbor cells, and the generation pilot frequency sequence also sends on downlink pilot frequency channel;On the broadcasting multicast service layer, the base station of each sub-district utilizes a scrambler that is different from single each scrambler of ripple operation layer to the orthogonal sequence scrambling in a plurality of neighbor cells, and the generation pilot frequency sequence also sends on downlink pilot frequency channel.
- 2, the method for claim 1 is characterized in that:On the unicast service layer, the base station of described each sub-district pilot frequency sequence that each sector sends in this sub-district is by generating after the different orthogonal sequence scramblings.
- 3, method as claimed in claim 2 is characterized in that:On the broadcasting multicast service layer, generate after the base station of described each sub-district pilot frequency sequence that each sector sends in this sub-district adopts same orthogonal sequence scrambling, and this orthogonal sequence is different from the orthogonal sequence that adopt each sector of single ripple operation layer.
- 4, as claim 1 or 3 described methods, it is characterized in that:Described mobile communication system is an ofdm system, and described orthogonal sequence is the number according to pilot sub-carrier in the system bandwidth, the sequence of the respective length that obtains after Walsh Walsh code weight is answered.
- 5, method as claimed in claim 4 is characterized in that: the length of described Walsh Walsh sign indicating number is 4.
- 6, method as claimed in claim 4 is characterized in that the generative process of described scrambler may further comprise the steps:Step a, according to the number of available subcarrier in the system bandwidth, a plurality of Gold sign indicating numbers of selecting respective length are respectively as the scrambler of each neighbor cell;Step b takes out the scrambler that forms the respective cell downlink pilot frequency channel with the same number of chip of pilot sub-carrier respectively from described scrambler.
- 7, method as claimed in claim 6 is characterized in that:Step b takes out the scrambler of preceding L the chip identical with pilot sub-carrier number L as described downlink pilot frequency channel from described scrambler.
- 8, the base station in a kind of mobile communication system, described mobile communication system comprises a plurality of neighbor cells, this base station is positioned at one of them sub-district, it is characterized in that described base station comprises with lower module:Unicast service descending pilot frequency sending module, be used to utilize the scrambler of distributing to this sub-district unicast service layer to the orthogonal sequence scrambling, generate pilot frequency sequence and also send on downlink pilot frequency channel, the base station in described scrambler and the described a plurality of neighbor cells in other sub-districts is used for to the scrambler of pilot channel scrambling different;Broadcasting multicast service descending pilot frequency sending module, be used to utilize the scrambler of distributing to this Cell Broadcast CB multicast service layer to the orthogonal sequence scrambling, the generation pilot frequency sequence also sends on downlink pilot frequency channel, and described scrambler is different with the scrambler that described a plurality of neighbor cell unicast service layers adopt.
- 9, base station as claimed in claim 8 is characterized in that:Described unicast service descending pilot frequency sending module adopts different orthogonal sequences to generate pilot signal to each sector in this sub-district.
- 10, base station as claimed in claim 9 is characterized in that:The orthogonal sequence that adopt each sector of orthogonal sequence and unicast service layer that described broadcasting multicast service descending pilot frequency sending module adopts is different.
- 11, as claim 8 or 10 described base stations, it is characterized in that:Described mobile communication system is an ofdm system, and described unicast service descending pilot frequency sending module and broadcasting multicast service descending pilot frequency sending module further comprise:The orthogonal sequence generation unit is used for according to the number of pilot sub-carrier in the system bandwidth Walsh Walsh sign indicating number being carried out repetition, generates the sequence of respective length.
- 12, base station as claimed in claim 11 is characterized in that: the length of the Walsh Walsh sign indicating number that described orthogonal sequence generation unit uses is 4.
- 13, base station as claimed in claim 11 is characterized in that: described unicast service descending pilot frequency sending module and broadcasting multicast service descending pilot frequency sending module further comprise:The scrambler dispensing unit, be used to dispose the scrambler of pilot channel, the scrambler of described pilot channel generates in the following manner: the Gold sign indicating number of selecting respective length according to the number of available subcarrier in the system bandwidth is respectively as the scrambler of each neighbor cell, and takes out the scrambler that forms the respective cell downlink pilot frequency channel with the same number of chip of pilot sub-carrier from described scrambler respectively.
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| CN102804658A (en) * | 2009-06-23 | 2012-11-28 | 株式会社Ntt都科摩 | Wireless base station device, mobile station device, and wireless communication method |
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| CN1751489B (en) * | 2003-01-07 | 2010-06-16 | 高通股份有限公司 | Pilot transmission schemes for wireless multi-carrier communication systems |
| CN1972268A (en) * | 2005-11-25 | 2007-05-30 | 北京三星通信技术研究有限公司 | Method for adding scrambling code in OFDM-based system |
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| CN102468908A (en) * | 2010-11-05 | 2012-05-23 | 大唐移动通信设备有限公司 | Configuration method of demodulation reference signal of backhaul link control channel and equipment |
| CN102932747A (en) * | 2012-11-22 | 2013-02-13 | 广西师范大学 | Networking method and system of mobile communication wireless access network based on layered architecture |
| CN102932747B (en) * | 2012-11-22 | 2015-11-25 | 广西师范大学 | Based on mobile communication wireless Access Network network-building method and the system of layered architecture |
| CN110784295A (en) * | 2019-10-25 | 2020-02-11 | 中山大学 | Uplink URRLC service and eMBB service coexistence method based on preemption |
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