CN103916227A - Method for sending public pilot frequency and base station - Google Patents
Method for sending public pilot frequency and base station Download PDFInfo
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- CN103916227A CN103916227A CN201310008657.8A CN201310008657A CN103916227A CN 103916227 A CN103916227 A CN 103916227A CN 201310008657 A CN201310008657 A CN 201310008657A CN 103916227 A CN103916227 A CN 103916227A
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Abstract
The invention discloses a method for sending a public pilot frequency. The method is applied to a network which is deployed in a new carrier wave type and introduced through LTE R12. Each subframe which sends a CRS and is borne on new carrier waves through a base station in the network contains two time slots. The method comprises the steps that when the CRS is sent by the base station through any PRB of any subframe, the CRS is sent on one of the two time slots corresponding to the PRB, and the CRS is not sent on the other of the two time slots. Based on the same conception, the invention discloses the base station. Under the condition that the full bandwidth is occupied by the CRS, the pilot frequency density on a frequency domain can be reduced.
Description
Technical field
The application relates to communication technical field, particularly a kind of method and base station that sends common pilot.
Background technology
In the 12nd version Long Term Evolution (LTE R12) version, introduce new carrier type, object is better to dispose heterogeneous network, reduce the transmission that always sends (always on) signal, reach energy-conservation object, and can utilize scrappy frequency range to improve spectrum efficiency.
Always on signal is common pilot (CRS), and in the version before R12, this signal has three effects to be respectively: as data demodulates; Measure as RRM (RRM); And follow the tracks of as temporal frequency.In R11, by the time cycle of CRS pilot tone is increased to 5ms by 1ms, and only stay a port, and it goes without doing, and demodulation is used.Lower pilot density so in time, reaches the object of conserve energy.
In LTE R11, propose to reduce in time pilot density by the time cycle of CRS pilot tone is increased to realize, thereby reached the object of conserve energy.Introduce new carrier type in LTE Release12 version after, while being carried on the subframe transmission CRS on this new carrier wave, on frequency domain, reduce the transmission CRS mode of pilot density, in prior art, do not provide any implementation.
Summary of the invention
In view of this, the application provides a kind of method and base station that sends common pilot, in the situation that CRS has taken full bandwidth, can on frequency domain, reduce pilot density.
For solving the problems of the technologies described above, technical scheme of the present invention is achieved in that
Send a method of common pilot CRS, be applied in the network that new carrier type that LTE R12 introduces disposes, the subframe that in this network, base station is carried on the transmission CRS on this new carrier wave comprises two time slots, comprising:
When this base station sends CRS by arbitrary PRB of arbitrary subframe, on a time slot in two time slots corresponding to this PRB, send CRS, on another one time slot, do not send CRS.
A kind of base station, can be applicable in network that new carrier type that LTE R12 introduces disposes, and the subframe that in this network, base station is carried on the transmission CRS on this new carrier wave comprises two time slots, and described base station comprises: transmitting element;
Described transmitting element, while sending CRS, sends CRS on a time slot in two time slots corresponding to this PRB for this base station by arbitrary PRB of arbitrary subframe, does not send CRS on another one time slot.
In sum, when the application sends CRS by base station by arbitrary subframe, select a time slot of this subframe to send, another one time slot does not send CRS.In the situation that CRS has taken full bandwidth, on frequency domain, reduce pilot density.
Accompanying drawing explanation
Fig. 1 is the method flow schematic diagram that sends CRS in the specific embodiment of the invention;
Fig. 2 is the schematic diagram that sends CRS in the embodiment of the present invention on the PRB that distributes odd number mark;
Fig. 3 is the schematic diagram that sends CRS in the embodiment of the present invention on the PRB that distributes even number mark;
Fig. 4 is for sending the structural representation of CRS in the specific embodiment of the invention.
Embodiment
For making object of the present invention, technical scheme and advantage clearer, referring to the accompanying drawing embodiment that develops simultaneously, scheme of the present invention is described in further detail.
In the embodiment of the present invention, propose the method for CRS of transmission a kind of, be applied in the network that new carrier type that LTE R12 introduces disposes, the subframe that in this network, base station is carried on the transmission CRS on this new carrier wave comprises two time slots.When this base station sends CRS by arbitrary PRB of arbitrary subframe, on a time slot in two time slots corresponding to this Physical Resource Block (PRB), send CRS, on another one time slot, do not send CRS.
Referring to Fig. 1, Fig. 1 is the method flow schematic diagram that sends CRS in the specific embodiment of the invention.Concrete steps are:
Step 101, when base station sends CRS by arbitrary PRB of arbitrary subframe, sends CRS on a time slot in two time slots corresponding to this PRB.
This subframe has two time slots, can be chosen in arbitrary PRB of this subframe corresponding wherein on any time slot, send CRS, and do not send CRS on another one time slot.
Step 102, this base station does not send CRS on the another one time slot of this subframe.
For convenience, two time slots that the subframe that sends CRS is comprised are designated as the first time slot and the second time slot, and are N PRB allocation identification 1,2 ... N; On the first time slot corresponding to the PRB that distributes odd number mark, send CRS; On the second time slot corresponding to the PRB that distributes even number mark, send CRS, wherein, N is natural number.
Be described in detail in below on PRB and how send CRS's.Suppose to have N PRB, this base station is this N PRB allocation identification 1,2 ... N, wherein, N is natural number.This base station sends CRS on the first time slot corresponding to the PRB that distributes odd number mark; On the second time slot corresponding to the PRB that distributes even number mark, send CRS.
Referring to Fig. 2, Fig. 2 is the schematic diagram that sends CRS in the embodiment of the present invention on the PRB that distributes odd number mark.In Fig. 2, distribute PRB as example take one, a PRB takies 12 continuous subcarriers on frequency domain, while adopting conventional (normal) Cyclic Prefix (CP), takies 14 symbols in time domain, 7 symbols were as first time slot in the past, and rear 7 symbols are as second time slot.If adopt expansion when CP, on frequency domain, take 12 symbols, in Fig. 2 take normal CP as example.The square frame of filling R0 in Fig. 2 is the position of carrying CRS on the first time slot that this PRB is corresponding, and the visible port R0 that only passes through on the first time slot sends CRS, does not send CRS on the second time slot.
Referring to Fig. 3, Fig. 3 is the schematic diagram that sends CRS in the embodiment of the present invention on the PRB that distributes even number mark.In Fig. 3, distribute the PRB of even number mark as example take one, on frequency domain, take 12 continuous subcarriers with a PRB in Fig. 2, while adopting conventional (normal) Cyclic Prefix (CP), in time domain, take 14 symbols, 7 symbols were as first time slot in the past, and rear 7 symbols are as second time slot.In Fig. 3, filling R0 square frame is the position of carrying CRS on the second time slot that this PRB is corresponding, and the visible port R0 that only passes through on the second time slot sends CRS, does not send CRS on the second time slot.
Fig. 2 and Fig. 3 have provided on the first time slot that a kind of PRB distributing odd number mark is corresponding and have sent CRS, send the implementation of CRS at the second time slot corresponding to the PRB that distributes even number mark, in the time of specific implementation, can also send CRS at the first time slot corresponding to the PRB that distributes even number mark, on the second time slot corresponding to the PRB that distributes odd number mark, send CRS, be configured according to user's demand, exemplify no longer one by one here.
Above-mentioned transmission CRS mode can reduce pilot density on frequency domain, reaches the object of saving energy.Owing to being to realize, therefore do not affect the precision of time and frequency measurement simultaneously in the situation that CRS takies full bandwidth, meet the resolution of time synchronized.The technical scheme proposing in the specific embodiment of the invention can also, in the time being applied in time-frequency tracking, utilize frequency selective channel that frequency diversity gain is provided.
Inventive concept based on same in the specific embodiment of the invention, also proposes a kind of base station, can be applicable in network that new carrier type that LTE R12 introduces disposes, and the subframe that in this network, base station is carried on the transmission CRS on this new carrier wave comprises two time slots.Referring to Fig. 4, Fig. 4 is for sending the structural representation of CRS in the specific embodiment of the invention.This base station comprises: transmitting element 401.
Transmitting element 401, while sending CRS, sends CRS on a time slot in two time slots corresponding to this PRB for this base station by arbitrary PRB of arbitrary subframe, does not send CRS on another one time slot.
Preferably, this base station further comprises: dispensing unit 402.
Dispensing unit 402, is designated as the first time slot and the second time slot for two time slots that the subframe of described transmission CRS is comprised; And be N PRB allocation identification 1,2 ... N; Wherein, N is natural number.
Transmitting element 401, is further used for dispensing unit 402 to distribute on the first time slot that the PRB of odd number mark is corresponding and send CRS; Dispensing unit 402 is distributed on the second time slot that the PRB of even number mark is corresponding and sends CRS.
The unit of above-described embodiment can be integrated in one, and also can separate deployment; Can merge into a unit, also can further split into multiple subelements.
In sum, the subframe that in the specific embodiment of the invention, in this network, base station is carried on the transmission CRS on this new carrier wave comprises two time slots.When this base station sends CRS by arbitrary subframe, select a time slot of this subframe to send, another one time slot does not send CRS.In the situation that CRS has taken full bandwidth, on frequency domain, reduce pilot density.
In specific embodiment, propose to pass through PRB allocation identification, PRB is divided into odd number PRB and even number PRB, by send CRS on the first time slot corresponding to odd number PRB, on the second time slot of even number PRB, send CRS, on frequency domain, reduce pilot density, when reaching the object of saving energy, can, in the time that time-frequency is followed the tracks of, utilize frequency selective channel that frequency diversity gain is provided.
The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (4)
1. send a method of common pilot CRS, be applied in the network that new carrier type that the 12nd version Long Term Evolution LTE R12 introduces disposes, the subframe that in this network, base station is carried on the transmission CRS on this new carrier wave comprises two time slots, it is characterized in that, comprising:
When this base station sends CRS by arbitrary Physical Resource Block PRB of arbitrary subframe, on a time slot in two time slots corresponding to this PRB, send CRS, on another one time slot, do not send CRS.
2. method according to claim 1, is characterized in that, described method further comprises: two time slots that this base station comprises the subframe of described transmission CRS are designated as the first time slot and the second time slot; And be N PRB allocation identification 1,2 ... N; On the first time slot corresponding to the PRB that distributes odd number mark, send CRS; On the second time slot corresponding to the PRB that distributes even number mark, send CRS, wherein, N is natural number.
3. a base station, can be applicable in the network of new carrier type deployment of the 12nd version Long Term Evolution LTE R12 introducing, the subframe that in this network, base station is carried on the transmission common pilot CRS on this new carrier wave comprises two time slots, it is characterized in that, described base station comprises: transmitting element;
Described transmitting element, while sending CRS, sends CRS on a time slot in two time slots corresponding to this PRB for this base station by arbitrary Physical Resource Block PRB of arbitrary subframe, does not send CRS on another one time slot.
4. method according to claim 3, is characterized in that, described base station further comprises: dispensing unit;
Described dispensing unit, is designated as the first time slot and the second time slot for two time slots that the subframe of described transmission CRS is comprised; For N PRB allocation identification 1,2 ... N; Wherein, N is natural number;
Described transmitting element, is further used on the first corresponding PRB of described dispensing unit distribution odd number mark time slot, sending CRS; To on the second corresponding PRB of described dispensing unit distribution even number mark time slot, send CRS.
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Owner name: ZHANXUN COMMUNICATION (SHANGHAI) CO. LTD. Effective date: 20141016 |
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Effective date of registration: 20141016 Address after: 100045 Beijing city Xicheng District Yuetan Nan Street 11 Applicant after: Research Institute of Telecommunications Transmission, Ministry of Industry and Information Technology Applicant after: Zhanxun Communication (Shanghai) Co., Ltd. Address before: 100045 Beijing city Xicheng District Yuetan Nan Street 11 Applicant before: Research Institute of Telecommunications Transmission, Ministry of Industry and Information Technology |
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