CN103974407A - Mapping method, mapping system and mapping device for fine synchronous tracking reference marks - Google Patents
Mapping method, mapping system and mapping device for fine synchronous tracking reference marks Download PDFInfo
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- CN103974407A CN103974407A CN201310042573.6A CN201310042573A CN103974407A CN 103974407 A CN103974407 A CN 103974407A CN 201310042573 A CN201310042573 A CN 201310042573A CN 103974407 A CN103974407 A CN 103974407A
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Abstract
The invention discloses a mapping method, a mapping system and a mapping device for fine synchronous tracking reference marks. The mapping method includes that a base station sends the fine synchronous tracking reference marks to a terminal through a guard band of a downlink channel to achieve the fine synchronous tracking. According to the technique scheme, the fine synchronous tracking reference marks are mapped in the guard band and free of using actual band, so that interference to the adjacent region is lowered, available resources are increased and novel carrier design is more flexible.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to mapping method, system and the device of the synchronous track reference symbol of a kind of essence.
Background technology
In LTE system, be not that all frequency bands that distribute all can take, band edge can give over to guard band, and interference protection is provided, as shown in Figure 1.For example 20M system, distributes 110RB, the actual 100RB that uses, and the each 5RB in edge, as guard band, meets the out-of-band radiation requirement of radio frequency, and all data-signal, reference signals etc. are all transmitted in actual service band.
In LTE R8/9/10 version, system is entered link synchronization tracing by public reference signal (Common ReferenceSigna l, CRS).As shown in Figure 2, taking 4 port CRS as example, public reference signal is interval 2RE(running time-frequency resource element on frequency domain), full bandwidth (actual service band) sends, 3 symbols of every Time Slot Occupancy in time domain.
In order further to promote spectrum efficiency, support better HetNet, and the factor such as energy-conservation, 3GPP determines to introduce a kind of new carrier type (New Carrier Type, NCT).New carrier wave does not support transmission mode 1-8(transmission mode 1-7 to need public reference signal to carry out demodulation), and from R10, system is carried out physical layer measurement (R8/9 is undertaken by public reference signal) by CSI-RS, so the major applications scene of public reference signal does not all exist.
Therefore in NCT design, wish to reduce or eliminate public reference signal CRS, thereby can reach further lifting spectrum efficiency, the design object such as energy-conservation.But synchronous tracking still need to be undertaken by public reference signal CRS, if public reference signal CRS is removed completely in NCT, synchronous/synchronous tracking of essence has problem.For this problem, current existing scheme is: continue to retain public reference signal CRS, for essence synchronous/synchronously follow the tracks of, but transmission cycle (every 5ms sends out once) that increases public reference signal CRS, it sends bandwidth and can reduce also and can not reduce.
Although existing scheme for ensure essence synchronous/synchronously follow the tracks of, still retained public reference signal CRS, but consider that public reference signal CRS is the cell level parameter that full bandwidth sends, its periodicity transmission meeting causes larger interference to adjacent area, this is because for ensureing channel estimating quality, public reference signal CRS will send after power ascension, and the transmitted power of public reference signal CRS is higher than the transmitted power of data, and user data can be subject to stronger adjacent area with CRS interference frequently.
Every TTI6 symbol (4 port) according to R8/9/10 public reference signal CRS, full bandwidth (actual service band) sends, every RB(Resource Block) in maximum 12 RE(4 ports) be used for transmitting public reference signal CRS, the public reference signal CRS expense of every Resource Block is 12/84=14.29%, and expense is larger.Prior art has increased the transmission cycle of common reference symbol CRS, has reduced to a certain extent the expense of the public reference signal CRS of whole system.But in those moment that send public reference signal CRS, the expense of public reference signal CRS is still larger, has reduced the throughput of system in this moment.
In LTE system, if resource is taken by certain signal (data, control signal, reference signal, synchronizing signal etc.), can not be used by other signals.Retain public reference signal CRS, mean the resource that public reference signal CRS uses, other signals cannot use, and new carrier wave need to be avoided the resource that these may be taken by public reference signal CRS in the time of design, cause resource fragmentation, limit new carrier wave design.
Summary of the invention
Take the technical problem of resource in order to solve the public reference signal CRS existing in prior art, the present invention proposes mapping method, system and the device of the synchronous track reference symbol of a kind of essence, can be when realization essence be synchronous, do not take actual service band, reduce the interference to adjacent area, increase available resources.
One aspect of the present invention provides the mapping method of the synchronous track reference symbol of a kind of essence, is applicable in LTE system, and base station sends the synchronous track reference symbol of essence to terminal by the guard band at down channel, and realization essence is synchronous follows the tracks of.
Another aspect of the present invention provides the mapped system of the synchronous track reference symbol of a kind of essence, is applicable to, in LTE system, comprise base station and terminal, wherein,
Base station sends the synchronous track reference symbol of essence to terminal for the guard band by down channel;
Terminal receives the synchronous track reference symbol of essence for the guard band by down channel.
Another aspect of the present invention provides a kind of base station, is applicable in LTE system, and described base station comprises sending module, and described sending module sends the synchronous track reference symbol of essence to terminal for the guard band by down channel.
Another aspect of the present invention provides a kind of terminal, is applicable in LTE system, and described terminal comprises receiver module, and described receiver module receives the synchronous track reference symbol of essence for the guard band by down channel.
Technical scheme of the present invention due to by synchronous essence track reference sign map on guard band, do not take actual service band, can greatly reduce the interference to adjacent area, increase available resources, make the design of new carrier wave can be more flexible.
Brief description of the drawings
Fig. 1 is the schematic diagram of allocated frequency band in background technology.
Fig. 2 is the schematic diagram of 4 port common reference symbol in background technology.
Fig. 3 is the synchronous flow chart of following the tracks of of essence in the embodiment of the present invention.
Fig. 4 is one of mapping schematic diagram of the synchronous track reference symbol of essence in the embodiment of the present invention one.
Fig. 5 be the synchronous track reference symbol of essence in the embodiment of the present invention one mapping schematic diagram two.
Fig. 6 is one of mapping schematic diagram of the synchronous track reference symbol of essence in the embodiment of the present invention two.
Fig. 7 be the synchronous track reference symbol of essence in the embodiment of the present invention two mapping schematic diagram two.
Fig. 8 is the structural representation of the mapped system of the synchronous track reference symbol of essence in the embodiment of the present invention.
Fig. 9 is architecture of base station schematic diagram in the embodiment of the present invention.
Figure 10 is terminal structure schematic diagram in the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Fig. 3 is the synchronous flow chart of following the tracks of of essence in the embodiment of the present invention.As shown in Figure 3, this flow process comprises the following steps:
Step 301, in LTE system, utilize master sync signal (Primary SynchronizationSignal, PSS) and auxiliary synchronous signals (Secondary Synchronization Signal, SSS) to carry out initial synchronisation, complete cell search process, obtain community I D.
Step 302, the synchronous track reference symbol of utilization essence carry out essence synchronously, carry out to received signal time-frequency compensation.
Step 303, carry out descending each control channel, comprise Physical Broadcast Channel (Physical BroadChannel, PBCH), physical mixing retransmission indicating chanel (Physical Hybrid ARQIndicatorChannel, PHICH), Physical Control Format Indicator Channel (Physical Control FormatIndicator Channel, and the detection of Physical Downlink Control Channel (Physical DownlinkControl Channel, PDCCH) PCFICH).
Step 304, the downstream data channel of carrying out, as the detection of Physical Downlink Shared Channel (Physical DownlinkShared Channel, PDSCH).
Step 305, for preventing clock drift, periodically utilize the synchronous track reference symbol of essence to enter link synchronization tracing.
In this process, need to utilize the synchronous track reference symbol of essence to carry out essence synchronously, two specific embodiments are described below.
As shown in Figure 4 and Figure 5, in the mapping scheme of the synchronous track reference symbol of the first essence, system assignment bandwidth is BW, and wherein the bandwidth of actual service band is BWu, distinguishes bandwidth reserved BWr as guard band at the two ends of system assignment bandwidth.
Base station sends the synchronous track reference symbol of essence to terminal by the guard band BWr at down channel, and the synchronous track reference symbol of this essence takies one end near actual service band BWu on guard band.
The bandwidth that the synchronous track reference symbol of this essence takies is less than 1/2 of guard band bandwidth, synchronous track reference symbol two symbols of each Time Slot Occupancy in time domain of essence, 2, interval RE on frequency domain.
I, interval, base station TTI(transmission time interval, subframe) send once the synchronous track reference symbol of essence, wherein i is more than or equal to 1 positive integer.
As shown in Figure 6 and Figure 7, in the mapping scheme of the synchronous track reference symbol of the second essence, system assignment bandwidth is BW, and wherein the bandwidth of actual service band is BWu, distinguishes bandwidth reserved BWr as guard band at the two ends of system assignment bandwidth.
Base station sends the synchronous track reference symbol of essence to terminal by the guard band BWr at down channel, and the synchronous track reference symbol of this essence takies one end near actual service band BWu on guard band.
The bandwidth that the synchronous track reference symbol of this essence takies is less than 1/2 of guard band bandwidth, and the synchronous track reference symbol symbol of each Time Slot Occupancy in time domain of essence takies 12 continuous RE on frequency domain.
I, interval, base station TTI sends once the synchronous track reference symbol of essence, and wherein i is more than or equal to 1 positive integer.
For realizing above-mentioned flow process, the invention provides two embodiment of the mapped system of the synchronous track reference symbol of essence.
As shown in Figure 8, this system is applicable in LTE system first embodiment, comprises base station 801 and terminal 802.
This base station sends the synchronous track reference symbol of essence to terminal for the guard band by down channel, be further used for one end near actual service band on guard band and send the synchronous track reference symbol of described essence, be further used on guard band adopting 1/2 the bandwidth that is less than guard band bandwidth to send the synchronous track reference symbol of described essence near one end of actual service band, be further used for interval i TTI and send once the synchronous track reference symbol of essence, be further used for two symbols of each Time Slot Occupancy in time domain, on frequency domain, 2, interval RE sends the synchronous track reference symbol of described essence.
This terminal receives the synchronous track reference symbol of essence for the guard band by down channel, be further used for one end near actual service band on guard band and receive the synchronous track reference symbol of described essence, be further used on guard band adopting 1/2 the bandwidth that is less than guard band bandwidth to receive the synchronous track reference symbol of described essence near one end of actual service band, be further used for interval i TTI and send once the synchronous track reference symbol of essence, be further used for two symbols of each Time Slot Occupancy in time domain, on frequency domain, 2, interval RE receives the synchronous track reference symbol of described essence.
Second embodiment of the mapped system of the synchronous track reference symbol of essence is close with first embodiment, and both differences are:
Base station is further used for symbol of each Time Slot Occupancy in time domain, takies 12 continuous RE and send the synchronous track reference symbol of described essence on frequency domain.
Terminal is further used for symbol of each Time Slot Occupancy in time domain, takies 12 continuous RE and receive the synchronous track reference symbol of described essence on frequency domain.
The present invention also provides two embodiment of base station.
In first embodiment, as shown in Figure 9, this base station comprises sending module, this sending module sends the synchronous track reference symbol of essence to terminal for the guard band by down channel, be further used for one end near actual service band on guard band and send the synchronous track reference symbol of described essence, be further used on guard band adopting 1/2 the bandwidth that is less than guard band bandwidth to send the synchronous track reference symbol of described essence near one end of actual service band, be further used for interval i TTI and send once the synchronous track reference symbol of essence, be further used for two symbols of each Time Slot Occupancy in time domain, on frequency domain, 2, interval RE sends the synchronous track reference symbol of described essence.
Second embodiment of base station is close with first embodiment, and both differences are: the sending module of base station is further used for symbol of each Time Slot Occupancy in time domain, takies 12 continuous RE and send the synchronous track reference symbol of described essence on frequency domain.
The present invention also provides two embodiment of terminal.
In first embodiment, as shown in figure 10, this terminal comprises receiver module, this receiver module receives the synchronous track reference symbol of essence for the guard band by down channel, be further used for one end near actual service band on guard band and receive the synchronous track reference symbol of described essence, be further used on guard band adopting 1/2 the bandwidth that is less than guard band bandwidth to receive the synchronous track reference symbol of described essence near one end of actual service band, be further used for interval i TTI and send once the synchronous track reference symbol of essence, be further used for two symbols of each Time Slot Occupancy in time domain, on frequency domain, 2, interval RE receives the synchronous track reference symbol of described essence.
Second embodiment of terminal is close with first embodiment, and both differences are: the receiver module of terminal is further used for symbol of each Time Slot Occupancy in time domain, takies 12 continuous RE and receive the synchronous track reference symbol of described essence on frequency domain.
Technical scheme of the present invention due to by synchronous essence track reference sign map on guard band, do not take actual service band, can greatly reduce the interference to adjacent area, increase available resources, make the design of new carrier wave can be more flexible.
It should be noted that: above embodiment is only unrestricted in order to the present invention to be described, the present invention is also not limited in above-mentioned giving an example, and all do not depart from technical scheme and the improvement thereof of the spirit and scope of the present invention, and it all should be encompassed in claim scope of the present invention.
Claims (24)
1. a mapping method for the synchronous track reference symbol of essence, is applicable to, in LTE system, it is characterized in that, base station sends the synchronous track reference symbol of essence to terminal by the guard band at down channel, and realization essence is synchronous follows the tracks of.
2. the mapping method of the synchronous track reference symbol of a kind of essence according to claim 1, is characterized in that, the synchronous track reference symbol of described essence takies one end near actual service band on guard band.
3. the mapping method of the synchronous track reference symbol of a kind of essence according to claim 2, is characterized in that, the bandwidth that the synchronous track reference symbol of described essence takies is less than 1/2 of guard band bandwidth.
4. the mapping method of the synchronous track reference symbol of a kind of essence according to claim 3, is characterized in that, i, interval, base station TTI sends once the synchronous track reference symbol of essence, and wherein i is more than or equal to 1 positive integer.
5. according to the mapping method of the synchronous track reference symbol of a kind of essence described in arbitrary claim in claim 1-4, it is characterized in that, the synchronous track reference symbol of described essence is two symbols of each Time Slot Occupancy in time domain, 2, interval RE on frequency domain.
6. according to the mapping method of the synchronous track reference symbol of a kind of essence described in arbitrary claim in claim 1-4, it is characterized in that, the synchronous track reference symbol of described essence is symbol of each Time Slot Occupancy in time domain, takies 12 continuous RE on frequency domain.
7. a mapped system for the synchronous track reference symbol of essence, is applicable to, in LTE system, it is characterized in that, comprises base station and terminal, wherein,
Base station sends the synchronous track reference symbol of essence to terminal for the guard band by down channel;
Terminal receives the synchronous track reference symbol of essence for the guard band by down channel.
8. the mapped system of the synchronous track reference symbol of a kind of essence according to claim 7, is characterized in that, base station is further used for one end near actual service band on guard band and sends the synchronous track reference symbol of described essence;
Terminal is further used for one end near actual service band on guard band and receives the synchronous track reference symbol of described essence.
9. the mapped system of the synchronous track reference symbol of a kind of essence according to claim 8, it is characterized in that, base station is further used on guard band adopting 1/2 the bandwidth that is less than guard band bandwidth to send the synchronous track reference symbol of described essence near one end of actual service band;
Terminal is further used on guard band adopting 1/2 the bandwidth that is less than guard band bandwidth to receive the synchronous track reference symbol of described essence near one end of actual service band.
10. the mapped system of the synchronous track reference symbol of a kind of essence according to claim 8, is characterized in that, base station is further used for interval i TTI and sends once the synchronous track reference symbol of essence, and wherein i is more than or equal to 1 positive integer;
Terminal is further used for interval i TTI and sends once the synchronous track reference symbol of essence.
11. according to the mapped system of the synchronous track reference symbol of a kind of essence described in arbitrary claim in claim 7-10, it is characterized in that, base station is further used for two symbols of each Time Slot Occupancy in time domain, and on frequency domain, 2, interval RE sends the synchronous track reference symbol of described essence;
Terminal is further used for two symbols of each Time Slot Occupancy in time domain, and on frequency domain, 2, interval RE receives the synchronous track reference symbol of described essence.
12. according to the mapped system of the synchronous track reference symbol of a kind of essence described in arbitrary claim in claim 7-10, it is characterized in that, base station is further used for symbol of each Time Slot Occupancy in time domain, takies 12 continuous RE and send the synchronous track reference symbol of described essence on frequency domain;
Terminal is further used for symbol of each Time Slot Occupancy in time domain, takies 12 continuous RE and receive the synchronous track reference symbol of described essence on frequency domain.
13. 1 kinds of base stations, are applicable to, in LTE system, it is characterized in that, described base station comprises sending module, and described sending module sends the synchronous track reference symbol of essence to terminal for the guard band by down channel.
14. a kind of base stations according to claim 13, is characterized in that, described sending module is further used for one end near actual service band on guard band and sends the synchronous track reference symbol of described essence.
15. a kind of base stations according to claim 14, is characterized in that, described sending module is further used on guard band adopting 1/2 the bandwidth that is less than guard band bandwidth to send the synchronous track reference symbol of described essence near one end of actual service band.
16. a kind of base stations according to claim 15, is characterized in that, described sending module is further used for interval i TTI and sends once the synchronous track reference symbol of essence, and wherein i is more than or equal to 1 positive integer.
17. according to a kind of base station described in arbitrary right in claim 13-16, it is characterized in that, described sending module is further used for two symbols of each Time Slot Occupancy in time domain, and on frequency domain, 2, interval RE sends the synchronous track reference symbol of described essence.
18. according to a kind of base station described in arbitrary right in claim 13-16, it is characterized in that, described sending module is further used for symbol of each Time Slot Occupancy in time domain, takies 12 continuous RE and send the synchronous track reference symbol of described essence on frequency domain.
19. 1 kinds of terminals, are applicable to, in LTE system, it is characterized in that, described terminal comprises receiver module, and described receiver module receives the synchronous track reference symbol of essence for the guard band by down channel.
20. a kind of terminals according to claim 19, is characterized in that, described receiver module is further used for one end near actual service band on guard band and receives the synchronous track reference symbol of described essence.
21. a kind of terminals according to claim 20, is characterized in that, described receiver module is further used on guard band adopting 1/2 the bandwidth that is less than guard band bandwidth to receive the synchronous track reference symbol of described essence near one end of actual service band.
22. a kind of terminals according to claim 21, is characterized in that, described receiver module is further used for interval i TTI and receives once the synchronous track reference symbol of essence, and wherein i is more than or equal to 1 positive integer.
23. according to a kind of terminal described in arbitrary right in claim 19-22, it is characterized in that, described receiver module is further used for two symbols of each Time Slot Occupancy in time domain, and on frequency domain, 2, interval RE receives the synchronous track reference symbol of described essence.
24. according to a kind of terminal described in arbitrary right in claim 19-22, it is characterized in that, described receiver module is further used for symbol of each Time Slot Occupancy in time domain, takies 12 continuous RE and receive the synchronous track reference symbol of described essence on frequency domain.
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