CN101370273A - Notifying method for demodulation reference signal mode in long-term evolution system - Google Patents
Notifying method for demodulation reference signal mode in long-term evolution system Download PDFInfo
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- CN101370273A CN101370273A CNA200710142530XA CN200710142530A CN101370273A CN 101370273 A CN101370273 A CN 101370273A CN A200710142530X A CNA200710142530X A CN A200710142530XA CN 200710142530 A CN200710142530 A CN 200710142530A CN 101370273 A CN101370273 A CN 101370273A
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Abstract
This invention discloses a notification method of demodulating reference signal mode in a long-term advancing system, which notifies the demodulating reference signal mode to all terminals in a cell when a base station detects that the demodulating reference signal mode should be notified to the terminal so as to improve the self-adapting ability and the system demodulating performance of up demodulating of LTE system. The method includes: setting the demodulating reference signal mode of the terminal in the system information and sending the system information to the terminal through a broadcast channel when the base station detects that the demodulating reference signal mode should be notified to the terminal.
Description
Technical field
The present invention relates to 3GPP LTE (third generation collaborative project Long Term Evolution, Three GenerationPartner Project Long Term Evolved) system, relate in particular to the Notification Method of demodulated reference signal mode in LTE TDD (time division duplex, the Time Division Duplex) system.
Background technology
3GPP LTE system is referring to Fig. 1, and mainly by terminal, base station and core net are formed.The connection of logic or physics can be arranged between the base station as required, and the network that the base station is formed is called wireless access network (RAN, Radio Access Network), is responsible for the Access Layer affairs, such as the management of Radio Resource; The Radio Resource of up-downgoing is responsible for scheduling by the mode of shared channel by the base station.The base station is connected with core net, and each base station can connect with one or more than one core net node (CN, Core Network).Core net is responsible for the Non-Access Stratum affairs, such as charging, location management etc.Terminal be meant can with the equipment of network communication, such as mobile phone or notebook computer etc.Each terminal only is connected to a base station in the network usually on up direction.
3GPP is that LTE has defined two kinds of TDD wireless frame structures, type (Type) 1 and type 2.Except subframe the time domain time division duplex, Class1 wireless frame structure and FDD (Frequency Division Duplexing (FDD), FrequencyDivision Duplex) just the same, be the long 1ms of each subframe, contain 14 symbolic blocks (SB, Symbol Block), 3GPP stipulates that the duration of each symbolic blocks is 66.67us at present, an additional Cyclic Prefix (CP, Cyclic Prefix) before each symbolic blocks; And Type 2 wireless frame structures are the wireless frame structures with TD-SCDMA (TD SDMA insert, Time Division Synchronous CodeDivision Multiple Access) system compatible.Type 2 wireless frame structures as shown in Figure 2, on time domain, 10ms is a radio frames, 5ms is a field, a field contains 7 subframes and 3 special time slots, the long 0.675ms of each subframe.If use general cyclic prefix (NormalCP), then each subframe comprises 9 symbolic blocks; If use extended cyclic prefix (Extended CP), then each subframe comprises 8 symbolic blocks.3GPP stipulates that the duration of each symbolic blocks all is 66.67us at present.Generally, each sub-frame of uplink uses a symbolic blocks carrying DMRS (Demodulation Reference Signal, phase reference when demodulated reference signal) receiving as upstream data, separate timing and estimate that according to DMRS phase place deflection determines the exact position of sampled signal, but under terminal (UE) high-speed motion situation, if each sub-frame of uplink still uses a symbolic blocks carrying DMRS, can't accurately estimate phase place deflection, the demodulation performance of LTE TDD Type2 system can not reach system requirements.Therefore, in order to improve the demodulation performance of LTE TDD Type2 system under the terminal high-speed motion conditions, can there be two kinds of DMRS patterns in 3GPP regulation LTE TDD Type2 system, and promptly each sub-frame of uplink uses a symbolic blocks carrying DMRS and each sub-frame of uplink to use two symbolic blocks carrying DMRS.The choosing of the demodulated reference signal mode of LTE TDD Type2 system is based on UE and also is based on the sub-district, and 3GPP does not also do regulation.
From foregoing as can be known, terminal need know use which kind of demodulated reference signal mode when up transmission, and demodulated reference signal mode is normally determined by the base station.Therefore, rigidly connect when switching to new base station and maybe need to change the demodulated reference signal mode of terminal into system or terminal in terminal, the base station need be notified to terminal with the demodulated reference signal mode that terminal should be used.Also there is not at present relevant solution.
Summary of the invention
The technical problem to be solved in the present invention provides the Notification Method of demodulated reference signal mode in a kind of long evolving system, detect and when terminal is notified demodulated reference signal mode, demodulated reference signal mode to be notified to all terminals in the sub-district in the base station, improve adaptive ability and system's demodulation performance of the demodulation of LTE system uplink.
In order to address the above problem, the invention provides the Notification Method of demodulated reference signal mode in a kind of long evolving system, the base station detects and need the demodulated reference signal mode of terminal be set in system information and by broadcast channel described system information be sent to terminal when terminal be notified demodulated reference signal mode.
Further, described terminal behind the receiving demodulation reference signal mode, adopts the up-to-date demodulated reference signal mode that receives to send demodulated reference signal at up channel from broadcast channel.
Further, when described demodulated reference signal mode used a symbolic blocks, described terminal used a symbolic blocks in sub-frame of uplink centre position to send demodulated reference signal at up channel.
Further, when described demodulated reference signal mode used two symbolic blocks, described terminal used a symbolic blocks and first symbolic blocks in sub-frame of uplink centre position to send demodulated reference signal at up channel.
Further, described base station is provided with the demodulated reference signal mode that demodulated reference signal mode territory indicating terminal should use in system information.
Further, it is the demodulated reference signal mode that a symbolic blocks is used in 0 expression that described base station is provided with demodulated reference signal mode territory value, value is the demodulated reference signal mode that two symbolic blocks are used in 1 expression, it is the demodulated reference signal mode that two symbolic blocks are used in 0 expression that perhaps described base station is provided with demodulated reference signal mode territory value, and value is the demodulated reference signal mode that a symbolic blocks is used in 1 expression.
Further, when the ratio that the quantity that is in terminal a kind of in the following situation in the sub-district accounts for total number of terminals in the sub-district surpassed the ratio of base station sets, described base station was provided with the demodulated reference signal mode of terminal and by broadcast channel described system information is sent to all terminals in the sub-district in system information: terminal rigidly connects into system, terminal and switches to the translational speed that new base station, moving velocity of terminal surpass base station sets.
Further, the translational speed of GPS global positioning system or the described relatively base station of Doppler frequency shift estimation technique sense terminals is used in described base station.
Further, described method is applicable to following system: LTE FDD system, LTE TDD Type1 system and LTE TDD Type2 system.
Adopt method of the present invention, in the LTE system, can detect in the base station and need when terminal is notified demodulated reference signal mode, in time demodulated reference signal mode be notified to all terminals in the sub-district, improve adaptive ability and system's demodulation performance of LTE system uplink demodulation.
Description of drawings
Fig. 1 is the structure chart of 3GPP LTE system;
Fig. 2 is the structure chart of radio frames in the LTE TDD Type2 system;
Fig. 3 is the flow chart of the Notification Method of demodulated reference signal mode in the present embodiment;
Fig. 4 is the process schematic diagram of notice demodulated reference signal mode in the present embodiment.
Embodiment
As shown in Figure 3, the concrete steps of the Notification Method of demodulated reference signal mode are as follows:
Step 301, the base station need be when terminal be notified demodulated reference signal mode, and the demodulated reference signal mode that terminal adopts in this sub-district is broadcasted in the base station in broadcast channel (BCH);
In the 3GPP system, have 8 or 9 symbolic blocks (SB) in the sub-frame of uplink, the position of the symbolic blocks that uses in the demodulated reference signal mode is generally fixed.When demodulated reference signal mode used a symbolic blocks, terminal used a symbolic blocks in sub-frame of uplink centre position to send demodulated reference signal at up channel; When demodulated reference signal mode used two symbolic blocks, terminal used a symbolic blocks and first symbolic blocks in sub-frame of uplink centre position to send demodulated reference signal at up channel.
When the ratio that the quantity that is in terminal a kind of in the following situation in the sub-district accounts for total number of terminals in the sub-district surpassed the ratio of base station sets, the base station was provided with in system information that demodulated reference signal mode that indicating terminal should use is come in the demodulated reference signal mode territory and this system information of broadcasting in broadcast channel: terminal rigidly connects into system, terminal and switches to the translational speed that new base station, moving velocity of terminal surpass base station sets.
The size in demodulated reference signal mode territory is 1 bit, and making demodulated reference signal mode territory value is the demodulated reference signal mode that a symbolic blocks is used in 0 expression, and value is the demodulated reference signal mode that two symbolic blocks are used in 1 expression; Perhaps making demodulated reference signal mode territory value is the demodulated reference signal mode that two symbolic blocks are used in 0 expression, and value is the demodulated reference signal mode that a symbolic blocks is used in 1 expression.
Step 302, terminal is the receiving demodulation reference signal mode from the BCH channel;
Step 303, terminal adopt the up-to-date demodulated reference signal mode that receives to send demodulated reference signal at up channel.
Said method is not limited to LTE TDD Type2 system, is applicable to any LTE system that needs the notice demodulated reference signal mode.For LTE FDD system or LTE TDD Type1 system, notify demodulated reference signal mode if desired, said method is suitable equally.
In the specific embodiment, in a LTE TDD Type2 system, the terminal that 10 operate as normal are arranged in the sub-district now, 2 terminals are wherein arranged always so that (200km/h is the moving velocity of terminal of base station sets more than or equal to 200km/h, the use of manufacturer's suggestion at present 200km/h) speed moves, a user A in the sub-district in addition, he just is being sitting in and is using terminal to carry out web page browsing on the automobile that stops, suppose that after this mobile status of other-end is constant, as shown in Figure 4, it is as follows to carry out the concrete steps of demodulated reference signal mode notice:
Step 401, all terminals in this sub-district are used the demodulated reference signal mode of a symbolic blocks (SB5);
Step 402, the launch train at user A place also constantly quickens, when the base station is estimated this train and is reached 200km/h with respect to the movement velocity of base station by Doppler frequency shift etc., there is the translational speed of 3 user terminals this sub-district more than or equal to 200km/h, the demodulated reference signal mode thresholding that (the ratio threshold values of base station sets is 30%) base station is provided with in the system information is 1, and this system information is sent to all terminals in the sub-district by broadcast channel;
Step 403, it is 1 notice that terminal receives the demodulated reference signal mode thresholding by broadcast channel;
Step 404, terminal adopt the demodulated reference signal mode of two symbolic blocks (SB1 and SB5) in up transmission, demodulated reference signal mode changes once more in listening to broadcast channel.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.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 (9)
1. the Notification Method of demodulated reference signal mode in the long evolving system, it is characterized in that, the base station detects and need the demodulated reference signal mode of terminal be set in system information and by broadcast channel described system information be sent to terminal when terminal be notified demodulated reference signal mode.
2. the method for claim 1 is characterized in that, described terminal behind the receiving demodulation reference signal mode, adopts the up-to-date demodulated reference signal mode that receives to send demodulated reference signal at up channel from broadcast channel.
3. the method for claim 1 is characterized in that, when described demodulated reference signal mode used a symbolic blocks, described terminal used a symbolic blocks in sub-frame of uplink centre position to send demodulated reference signal at up channel.
4. the method for claim 1 is characterized in that, when described demodulated reference signal mode used two symbolic blocks, described terminal used a symbolic blocks and first symbolic blocks in sub-frame of uplink centre position to send demodulated reference signal at up channel.
5. the method for claim 1 is characterized in that, described base station is provided with the demodulated reference signal mode that demodulated reference signal mode territory indicating terminal should use in system information.
6. method as claimed in claim 5, it is characterized in that, it is the demodulated reference signal mode that a symbolic blocks is used in 0 expression that described base station is provided with demodulated reference signal mode territory value, value is the demodulated reference signal mode that two symbolic blocks are used in 1 expression, it is the demodulated reference signal mode that two symbolic blocks are used in 0 expression that perhaps described base station is provided with demodulated reference signal mode territory value, and value is the demodulated reference signal mode that a symbolic blocks is used in 1 expression.
7. the method for claim 1, it is characterized in that, when the ratio that the quantity that is in terminal a kind of in the following situation in the sub-district accounts for total number of terminals in the sub-district surpassed the ratio of base station sets, described base station was provided with the demodulated reference signal mode of terminal and by broadcast channel described system information is sent to all terminals in the sub-district in system information: terminal rigidly connects into system, terminal and switches to the translational speed that new base station, moving velocity of terminal surpass base station sets.
8. method as claimed in claim 7 is characterized in that, the translational speed of GPS global positioning system or the described relatively base station of Doppler frequency shift estimation technique sense terminals is used in described base station.
9. the method for claim 1 is characterized in that, described method is applicable to following system: LTE FDD system, LTE TDD Type1 system and LTE TDD Type2 system.
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| CNA200710142530XA CN101370273A (en) | 2007-08-15 | 2007-08-15 | Notifying method for demodulation reference signal mode in long-term evolution system |
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| CNA200710142530XA CN101370273A (en) | 2007-08-15 | 2007-08-15 | Notifying method for demodulation reference signal mode in long-term evolution system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010124602A1 (en) * | 2009-04-30 | 2010-11-04 | 华为技术有限公司 | Method for information transmission and communication apparatus |
| CN101883399A (en) * | 2009-04-01 | 2010-11-10 | 宏达国际电子股份有限公司 | Handle the method and the related communication devices thereof of system information reception |
| CN102271406A (en) * | 2010-06-03 | 2011-12-07 | 中国移动通信集团公司 | Method and device for allocating DM-RS (Demodulation Reference Signal) ports |
| CN108141340A (en) * | 2015-10-01 | 2018-06-08 | Lg 电子株式会社 | The method and terminal of reference signal are sent in D2D communications |
| CN110115094A (en) * | 2019-03-26 | 2019-08-09 | 北京小米移动软件有限公司 | Random access configuration method and device |
-
2007
- 2007-08-15 CN CNA200710142530XA patent/CN101370273A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101883399A (en) * | 2009-04-01 | 2010-11-10 | 宏达国际电子股份有限公司 | Handle the method and the related communication devices thereof of system information reception |
| CN103152798A (en) * | 2009-04-01 | 2013-06-12 | 宏达国际电子股份有限公司 | Method of handling system information reception and related communication device |
| CN101883399B (en) * | 2009-04-01 | 2013-10-30 | 宏达国际电子股份有限公司 | Method of handling system information reception and related communication device |
| CN103152798B (en) * | 2009-04-01 | 2016-08-10 | 宏达国际电子股份有限公司 | Process method and the related communication devices thereof of system information reception |
| WO2010124602A1 (en) * | 2009-04-30 | 2010-11-04 | 华为技术有限公司 | Method for information transmission and communication apparatus |
| CN102271406A (en) * | 2010-06-03 | 2011-12-07 | 中国移动通信集团公司 | Method and device for allocating DM-RS (Demodulation Reference Signal) ports |
| CN102271406B (en) * | 2010-06-03 | 2014-05-07 | 中国移动通信集团公司 | Method and device for allocating DM-RS (Demodulation Reference Signal) ports |
| CN108141340A (en) * | 2015-10-01 | 2018-06-08 | Lg 电子株式会社 | The method and terminal of reference signal are sent in D2D communications |
| CN108141340B (en) * | 2015-10-01 | 2020-11-24 | Lg 电子株式会社 | Method and terminal for transmitting reference signal in D2D communication |
| CN110115094A (en) * | 2019-03-26 | 2019-08-09 | 北京小米移动软件有限公司 | Random access configuration method and device |
| CN110115094B (en) * | 2019-03-26 | 2023-12-05 | 北京小米移动软件有限公司 | Random access configuration method and device |
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