CN101677306A - Method and device for configuring reference signals - Google Patents
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Abstract
The invention discloses a method and device for configuring reference signals adapted to long-term evolution-advanced (LTE-A) systems. The method includes configuring cell-specific reference signal (CRS) for M antenna ports among K antenna ports according to the system demand in order to support the cells with K antenna ports, wherein K is an integer larger than 4, M is an integer larger than or equal to 1 and smaller than K; selecting N antenna ports from antenna ports other than the antenna ports configured with CRS for each user equipment (UE) in the cell, and configuring user-specific reference signal (URS) for the selected N antenna ports, wherein N is an integer larger than or equal to 1, and the addition of M and N is smaller than or equal to K; determining the transmission mode, and sending the configuration information and the transmission mode information to the UE. Applying the method and the device of the invention, application scope of the URS and performance of UE can beenhanced.
Description
Technical field
The present invention relates to mobile communication technology, pilot frequency collocation method and device in particularly a kind of senior Long Term Evolution (LTE-A, LongTerm Evolution-Advanced) system.
Background technology
Multi-input/output antenna (MIMO, multi-input and multi-output antenna) technology is being played the part of important role as a kind of important raising transmission quality and the physical layer multi-antenna technology of efficient in communication system of new generation.For example, the LTE system just supports diversity emission, spatial reuse and beam forming multiple MIMO technology such as (BF, Beam Forming).
In present LTE system, can support 4 * 4 antenna transmission, the promptly descending data of 4 antenna ports that can exist are at most carried out spatial reuse.So, just need be to the pilot tone of these 4 antenna ports, promptly the descending reference symbol is configured.Here the pilot tone of being mentioned comprises cell common pilots (CRS, Cell-specific Reference Signal) and special pilot frequency for user (URS, UE-specific ReferenceSignal), and wherein, CRS can be described as descending public reference signal again.CRS can send in each descending sub frame, and, on frequency domain, cover the whole system bandwidth, in time across whole descending sub frame.
Fig. 1 is the CRS configuration mode schematic diagram under existing regular circulation prefix (CP, the Circular Prefix) pattern, and R0 wherein, R1, R2, R3 are expressed as the CRS of antenna port 0,1,2,3 configurations respectively.Wherein, scheme (a) for only to exist under the situation of an antenna port 0, corresponding CRS configuration mode schematic diagram; Figure (b) and (c) under the situation that has two antenna ports 0 and 1, the CRS configuration mode schematic diagram of correspondence; Figure (d), (e), (f) and (g) under the situation that has four antenna ports 0,1,2 and 3, the CRS configuration mode schematic diagram of correspondence.For each subgraph among Fig. 1, its y direction is represented frequency domain, each little lattice is represented a carrier wave respectively, and X direction is represented a subframe, comprise two time slots (odd number time slot and even number time slot) in each subframe, further comprise 7 symbols (l=0～l=6) in each time slot again.
Fig. 2 is the CRS configuration mode schematic diagram under the existing expansion CP pattern.As can be seen, timeslot number included in each subframe becomes 6 by 7, and other parts shown in Figure 2 are same as shown in Figure 1, so repeat no more.
CRS is mainly used in Packet Common Control CHannel (PDCCH, Packet Dedicated ControlChannel), Physical Broadcast Channel (PBCH, Physical Broadcast Channel), Physical Multicast Channel (PBCH, Physical Muticast Channel) etc. demodulation, channel quality indication (CQI, Channel Quality Indicator) is estimated, the measurement when switch non-figuration user's channel estimating and sub-district etc., in the full bandwidth configuration, expense is bigger.
In actual applications, except that above-mentioned CRS, also can need to dispose URS under some situation.And in existing LTE system, URS only can be configured on the antenna port usually.Like this, when after having disposed URS on the antenna port, two or one in other three remaining antenna ports will be disposed CRS.
Shown in Fig. 3 and 4, Fig. 3 and 4 is respectively the URS configuration mode schematic diagram under existing conventional CP pattern and the expansion CP pattern, R wherein
5Promptly be expressed as URS.The characteristics of URS are only at Physical Downlink Shared Channel (PDSCH, Physical Downlink Shared Channel) transmission in, and with user terminal (UE, User Equipment) PDSCH channel width is identical, promptly, be used for the realization and the enhancing of the correlation functions such as PDSCH demodulation of this UE only in the PDSCH of certain UE internal transmission.
Along with the continuous development of technology, on the basis of LTE system, develop again and the LTE-A system, the demand of this system is as follows: peak rate descending greater than 1Gbps, up greater than 500Mbps; Aspect peaks spectrum efficient, satisfy descending: 30bps/Hz, up: 15bps/Hz; Aspect the VoIP capacity, need to satisfy demand greater than 300 parallel VoIP/5MHz, and the forward and backward compatibility of support and LTE.As seen, the LTE-A system important directions exactly will to indoor, local covers and low speed scene such as moves and does further to optimize.For this reason, numerous manufacturers have proposed 8 * 8 antenna transmission scheme, to solve the problems such as peaks spectrum efficient under the above-mentioned scene.
Under the situation that this antenna port increases, if still be configured according to the pilot tone of existing mode to 8 antenna ports, dispose URS such as only taking an antenna port, so owing to have only a kind of URS pattern at all UE, and can not carry out the difference configuration respectively according to different UE demands, so can limit the range of application of URS and the performance of UE greatly.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of pilot frequency collocation method, can improve the range of application of URS and the performance of UE.
Another object of the present invention is to provide a kind of pilot frequency configuration device, can improve the range of application of URS and the performance of UE.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of pilot frequency collocation method, this method are applicable in the senior Long Term Evolution LTE-A system, comprise:
Sub-district for supporting K antenna port according to system requirements, is M antenna port allocating cell public guide frequency CRS in the described K antenna port; Described K is one greater than 4 integer, and described M is one more than or equal to 1 and less than the integer of K;
At the arbitrary user terminal UE in the described sub-district, select N antenna port the antenna port beyond the described antenna port that has disposed CRS, be selected N antenna port configure user dedicated pilot URS; Described N is one more than or equal to 1 integer, and the sum of described M and N is less than or equal to K;
Determine transmission mode, and work configuration information and described transmission mode information are sent to described UE.
A kind of pilot frequency configuration device, this device are applicable in the senior Long Term Evolution LTE-A system, comprise:
Dispensing unit, be used at the sub-district of supporting K antenna port, according to system requirements, be M antenna port allocating cell public guide frequency CRS in the described K antenna port, described K is one greater than 4 integer, described M is one more than or equal to 1 and less than the integer of K, and at the arbitrary user terminal UE in the described sub-district, select N antenna port the antenna port beyond the described antenna port that has disposed CRS, be selected N antenna port configure user dedicated pilot URS, described N is one more than or equal to 1 integer, and the sum of described M and N is less than or equal to K, and definite transmission mode;
Transmitting element is used for work configuration information and described transmission mode information are sent to described UE.
As seen, adopt technical scheme of the present invention, no longer can only utilize an antenna port to dispose URS as prior art, but can flexible configuration CRS and the number of antennas of URS correspondence, thereby the range of application of URS and the performance of UE improved.
Description of drawings
Fig. 1 is the CRS configuration mode schematic diagram under the existing conventional CP pattern.
Fig. 2 is the CRS configuration mode schematic diagram under the existing expansion CP pattern.
Fig. 3 is the URS configuration mode schematic diagram under the existing conventional CP pattern.
Fig. 4 is the URS configuration mode schematic diagram under the existing expansion CP pattern.
Fig. 5 is the flow chart of pilot frequency collocation method first embodiment of the present invention.
Fig. 6～8 are three kinds of CRS and the URS configuration mode schematic diagram among the inventive method first embodiment.
Fig. 9 is the flow chart of pilot frequency collocation method second embodiment of the present invention.
Figure 10 is CRS and the URS configuration mode schematic diagram among the inventive method second embodiment.
Figure 11 is the composition structural representation of pilot frequency configuration device embodiment of the present invention.
Embodiment
For solving problems of the prior art, a kind of pilot frequency configuration scheme of the LTE-A system that is applicable to is completely newly proposed among the present invention, it is the antenna port number of flexible configuration CRS and URS correspondence, specific implementation comprises: at first, for the sub-district of supporting K antenna port,, be M antenna port configuration CRS in K the antenna port according to system requirements, wherein K is one greater than 4 integer, and M is one more than or equal to 1 and less than the integer of K; Then,, other antenna port beyond the antenna port that has disposed CRS, promptly select N antenna port in K-M antenna port, and be selected N antenna port configuration URS at the arbitrary UE in this sub-district; Wherein, N is one more than or equal to 1 integer, and the sum of M and N is less than or equal to K; At last, determine transmission mode, and work configuration information and transmission mode information are sent to UE.Usually, in the LTE-A system, the value of K is 8, and the value of M, N then can be provided with flexibly.
In addition,, can dispose URS, also can be respectively the different URS of its configuration at different UE according to identical mode for UE different in the sub-district; And, when the value of M is 1,2 or 4, can carry out the CRS configuration to M antenna port according to the mode identical, to keep compatibility to existing CRS configuration mode with CRS configuration mode in the existing LTE system.
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
Fig. 5 is the flow chart of pilot frequency collocation method first embodiment of the present invention.The value of supposing the K in the present embodiment is 8, and the value of M and N is respectively 4.As shown in Figure 5, may further comprise the steps:
Step 501:, be 4 antenna port configuration CRS in 8 antenna ports according to system requirements.
Specifically what antenna ports need be configured to CRS or URS is decided by actual demand.Such as, in actual applications, can only URS be used for data demodulates, and CRS be used to control the measurement of demodulation and channel quality and adjacent sub-district etc.; Perhaps, also URS and CRS can be used for data and control demodulation simultaneously, simultaneously CRS be used for the measurement of channel quality and adjacent sub-district etc.According to different CRS and URS purposes demand and performance requirement, can be respectively the antenna port configuration CRS and the URS of different numbers.
In the present embodiment,, four antenna ports that disposed CRS are called antenna port 0, antenna port 1, antenna port 2 and antenna port 3 for ease of describing.
Step 502: be remaining 4 antenna port configuration URS.
For ease of describing, remaining 4 antenna port is called antenna port 4, antenna port 5, antenna port 6 and antenna port 7.
Fig. 6～8 are three kinds of CRS and the URS configuration mode schematic diagram among the inventive method first embodiment.Shown in Fig. 6～8, R wherein
0, R
1, R
2And R
3Be expressed as the CRS of antenna port 0, antenna port 1, antenna port 2 and antenna port 3 configurations respectively; 4,5,6 and 7 be expressed as the URS that antenna port 4, antenna port 5, antenna port 6 and antenna port 7 dispose respectively.As can be seen, CRS configuration mode identical (as shown in Figure 1) in the configuration mode of CRS and the existing LTE system, the URS configuration mode of antenna port 4 also with the configuration mode identical (as shown in Figure 3) of existing URS, but the configuration density of antenna port 5, antenna port 6 and antenna port 7 then descends to some extent than antenna port 4, mainly is to consider the problem that reduces pilot-frequency expense.
Need to prove that three kinds of configuration modes are not limited to technical scheme of the present invention only for illustrating shown in Fig. 6～8.Such as, the configuration mode of URS also can show as other form, but need meet some requirements usually, can not be just the same such as previous time slot and a back time slot etc.
Step 503: determine transmission mode.
The transmission mode of being mentioned in the present embodiment comprises: utilize 8 CRS and URS in the antenna port to carry out the MIMO transmission, and utilize 4 URS in the antenna port to carry out wave beam forming, to obtain figuration gain.Concrete which kind of transmission mode of selecting can be determined according to current channel condition, if channel condition is relatively good, satisfy pre-provisioning request, determine that then transmission mode is to utilize 8 CRS and URS in the antenna port to carry out the MIMO transmission, to obtain higher system throughput and message transmission rate; Otherwise, determine that promptly transmission mode is to utilize 4 URS in the antenna port to carry out wave beam forming, to reduce the channel demodulation thresholding, guarantee to cover and the demodulation requirement.It is known in this field how carrying out MIMO transmission and wave beam forming, repeats no more.
Step 504: work configuration information and transmission mode information are sent to UE.
How to be sent as known in this fieldly, to repeat no more.In addition, after UE receives configuration information and transmission mode information, promptly can carry out processes such as channel estimating and input, it is known in this field that specific implementation is similarly, and repeats no more.
Fig. 9 is the flow chart of pilot frequency collocation method second embodiment of the present invention.Suppose in the present embodiment that the value of K is 8, the value of M is 2, and the value of N is 6.As shown in Figure 9, may further comprise the steps:
Step 901:, be 2 antenna port configuration CRS in 8 antenna ports according to system requirements.
In the present embodiment,, 2 antenna ports that disposed CRS are called antenna port 0 and antenna port 1 for ease of describing.
Step 902: be remaining 6 antenna port configuration URS.
For ease of describing, remaining 6 antenna port is called antenna port 2, antenna port 3, antenna port 4, antenna port 6, antenna port 6 and antenna port 7.
Figure 10 is CRS and the URS configuration mode schematic diagram among the inventive method second embodiment.As shown in figure 10, R wherein
0And R
1Be expressed as the CRS of antenna port 0 and antenna port 1 configuration respectively; 2,3,4,5,6 and 7 be expressed as the URS that antenna port 2, antenna port 3, antenna port 4, antenna port 5, antenna port 6 and antenna port 7 dispose respectively.As can be seen, the configuration mode of CRS is identical with CRS configuration mode in the existing LTE system.
The specific implementation of step 903～904 is identical with step 503～504, repeats no more.
Need to prove that two embodiment shown in above-mentioned Fig. 5 and 9 are only for illustrating, in actual applications, M and N can be on demand value arbitrarily, and neither addition equal 8, as long as satisfy M 〉=1, N 〉=1, and M+N≤8 get final product.
As seen, compared with prior art, scheme of the present invention has greater flexibility, such as: but the antenna port number of flexible configuration CRS and URS correspondence, and, can be its configuration URS flexibly, thereby improve the range of application of URS and the performance of UE for different UE; And scheme of the present invention can effectively reduce the pilot-frequency expense of CRS; Have again, scheme of the present invention can be determined transmission mode flexibly according to current channel condition, thereby can obtain higher system throughput and message transmission rate (in the MIMO transmission, can obtain all to be configured to the essentially identical performance of CRS) with 8 antenna ports, or reduce the channel demodulation thresholding, guarantee to cover and the demodulation requirement.
Based on said method, Figure 11 is the composition structural representation of pilot tone setting device embodiment of the present invention.In actual applications, this device can be meant the base station in the LTE-A system.As shown in figure 11, this device comprises:
Dispensing unit 111, be used at the sub-district of supporting K antenna port, according to system requirements, be M antenna port configuration CRS in K the antenna port, K is one greater than 4 integer, M is one more than or equal to 1 and less than the integer of K, and at the arbitrary UE in the sub-district, select N antenna port other antenna port beyond the antenna port that has disposed CRS, be selected N antenna port configuration URS, N is one more than or equal to 1 integer, and the sum of M and N is less than or equal to K, and definite transmission mode;
Transmitting element 112 is used for work configuration information and transmission mode information are sent to UE.
Wherein, described transmission mode comprises: utilize M+N CRS and the URS in the antenna port to carry out the MIMO transmission, and, utilize N the URS in the antenna port to carry out wave beam forming.
And when the value of M was 1,2 or 4, dispensing unit 111 can carry out the CRS configuration to M antenna port according to the mode identical with CRS configuration mode in the existing LTE system.
The concrete workflow of device embodiment shown in Figure 11 please refer to the respective description among the method embodiment shown in Fig. 5 and 9, repeats no more herein.
In a word, adopt technical scheme of the present invention, antenna port number by flexible configuration CRS and URS correspondence, the range of application of URS and the performance of UE have been improved, and reduced the pilot-frequency expense of CRS, also can carry out the wave beam forming of MIMO transmission and multiport simultaneously, take into account the requirement that throughput of system and sub-district cover.
In sum, more than be preferred embodiment of the present invention only, be not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1, a kind of pilot frequency collocation method is characterized in that, this method is applicable in the senior Long Term Evolution LTE-A system, comprises:
Sub-district for supporting K antenna port according to system requirements, is M antenna port allocating cell public guide frequency CRS in the described K antenna port; Described K is one greater than 4 integer, and described M is one more than or equal to 1 and less than the integer of K;
At the arbitrary user terminal UE in the described sub-district, select N antenna port the antenna port beyond the described antenna port that has disposed CRS, and be selected N antenna port configure user dedicated pilot URS; Described N is one more than or equal to 1 integer, and the sum of described M and N is less than or equal to K;
Determine transmission mode, and work configuration information and described transmission mode information are sent to described UE.
2, pilot frequency collocation method according to claim 1 is characterized in that, at UE different in the described sub-district, disposes URS according to identical mode, perhaps, at different UE, disposes URS according to different modes respectively.
3, pilot frequency collocation method according to claim 1 is characterized in that, described transmission mode comprises:
Utilize CRS and URS in the described M+N antenna port to carry out multi-input/output antenna MIMO transmission, and, utilize the URS in the described N antenna port to carry out wave beam forming.
4, pilot frequency collocation method according to claim 3 is characterized in that, described definite transmission mode comprises:
Determine transmission mode according to current channel condition, if current channel condition satisfies pre-provisioning request, determine that then transmission mode is to utilize CRS and URS in the described M+N antenna port to carry out the MIMO transmission, otherwise, determine that transmission mode is to utilize the URS in the described N antenna port to carry out wave beam forming.
According to each described pilot frequency collocation method in the claim 1～4, it is characterized in that 5, when the value of described M was 1,2 or 4, described was that M antenna port configuration CRS comprises:
According to the mode identical with CRS configuration mode in the LTE system is described M antenna port configuration CRS.
According to each described pilot frequency collocation method in the claim 1～4, it is characterized in that 6, the value of described K is 8.
7, a kind of pilot frequency configuration device is characterized in that, this device is applicable in the senior Long Term Evolution LTE-A system, comprises:
Dispensing unit, be used at the sub-district of supporting K antenna port, according to system requirements, be M antenna port allocating cell public guide frequency CRS in the described K antenna port, described K is one greater than 4 integer, described M is one more than or equal to 1 and less than the integer of K, and at the arbitrary user terminal UE in the described sub-district, select N antenna port the antenna port beyond the described antenna port that has disposed CRS, be selected N antenna port configure user dedicated pilot URS, described N is one more than or equal to 1 integer, and the sum of described M and N is less than or equal to K, and definite transmission mode;
Transmitting element is used for work configuration information and described transmission mode information are sent to described UE.
8, pilot frequency configuration device according to claim 7 is characterized in that, described transmission mode comprises:
Utilize CRS and URS in the described M+N antenna port to carry out multi-input/output antenna MIMO transmission, and, utilize the URS in the described N antenna port to carry out wave beam forming.
According to claim 7 or 8 described pilot frequency configuration devices, it is characterized in that 9, when the value of described M was 1,2 or 4, described dispensing unit carried out the CRS configuration according to the mode identical with CRS configuration mode in the LTE system to a described M antenna port.
10, according to claim 7 or 8 described pilot frequency configuration devices, it is characterized in that the value of described K is 8.
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| US11240694B2 (en) | 2017-09-07 | 2022-02-01 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Signal reporting method, terminal device, and network device |
| US11778500B2 (en) | 2017-09-07 | 2023-10-03 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Signal reporting method, terminal device, and network device |
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