CN101365232A - Demodulation reference signal mode notifying method in long-term evolution system - Google Patents
Demodulation reference signal mode notifying method in long-term evolution system Download PDFInfo
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- CN101365232A CN101365232A CNA2007101404093A CN200710140409A CN101365232A CN 101365232 A CN101365232 A CN 101365232A CN A2007101404093 A CNA2007101404093 A CN A2007101404093A CN 200710140409 A CN200710140409 A CN 200710140409A CN 101365232 A CN101365232 A CN 101365232A
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Abstract
The invention discloses a method for notifying a terminal of a demodulation reference signal mode in an LTE (Long-Term Evolution) system. A base station notifies the terminal of the demodulation reference signal when the base station detects that the terminal needs to be notified of the demodulation reference signal, thus improving the uplink demodulation adaptation ability of the LTE system. The method comprises the following steps: when the base station detects that the terminal needs to be notified of the demodulation reference signal, the base station sets the terminal demodulation reference signal mode of the terminal in a physical layer/data link layer control channel, and transmits the information of the physical layer/data link layer control channel 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 Type 2 systems can not reach system requirements.Therefore, in order to improve the demodulation performance of LTE TDD Type 2 systems under the terminal high-speed motion conditions, can there be two kinds of DMRS patterns in 3GPP regulation LTE TDD Type 2 systems, 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 Type 2 systems 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 terminal in the base station, improve the uplink demodulation adaptive ability of LTE system.
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 physical layer/data link layer control channel and physical layer/data link layer control channel information is 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 data at up channel from physical layer/data link layer control 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 data 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 data 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 the ascending resource authorization channel of physical layer/data link layer control channel.
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, described base station is with a kind of in the following ways of physical layer/when the data link layer control channel information sends to terminal: mode of unicast, multicast mode or broadcast mode.
Further, described base station is provided with the demodulated reference signal mode of terminal and physical layer/data link layer control channel information is sent to terminal when terminal rigidly connects into system or terminal when switching to new base station or moving velocity of terminal when surpassing the translational speed of base station sets in physical layer/data link layer control channel.
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 terminal, improve the adaptive ability 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:
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 data 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 data at up channel.
The base station need comprise following several situation when terminal is notified demodulated reference signal mode: when terminal rigidly connects into system, when terminal switches to new base station, when moving velocity of terminal surpasses the translational speed of base station sets.The base station uses GPS global positioning system or Doppler frequency shift to estimate to come the translational speed of sense terminals with respect to it.
The base station is provided with the demodulated reference signal mode that the demodulated reference signal mode territory comes indicating terminal to use in L1/L2 control channel UL grant channel (ascending resource authorization channel).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.
In step 301 and step 302, the L1/L2 control channel information can be that certain terminal is given in the base station clean culture, also can be that multicast is given one group of terminal, can also be broadcast to all terminals in the sub-district.
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 of a normal connecting system is arranged, the user just is being sitting in and is using this terminal to carry out web page browsing on the bullet train that stops, as shown in Figure 4, it is as follows to carry out the concrete steps of demodulated reference signal mode notice:
Step 401, terminal is used the demodulated reference signal mode of a symbolic blocks (SB5);
Step 402, bullet train starts and constantly quickens, (200km/h was the moving velocity of terminal of base station sets when bullet train reached 200km/h with respect to the movement velocity of base station when the base station is estimated by Doppler frequency shift etc., 200km/h is used in manufacturer's suggestion at present), the base station be provided with demodulated reference signal mode thresholding among the L1/L2 control channel UL grant be 1 and UL grant in other indication domain information send to terminal behind the combined coding together;
Step 403, it is 1 notice that terminal receives the demodulated reference signal mode thresholding by the L1/L2 control 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 UL grant 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 (10)
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 physical layer/data link layer control channel and physical layer/data link layer control channel information is 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 data at up channel from physical layer/data link layer control 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 data 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 data 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 the ascending resource authorization channel of physical layer/data link layer control channel.
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 is characterized in that, described base station is with a kind of in the following ways of physical layer/when the data link layer control channel information sends to terminal: mode of unicast, multicast mode or broadcast mode.
8. the method for claim 1, it is characterized in that, described base station is provided with the demodulated reference signal mode of terminal and physical layer/data link layer control channel information is sent to terminal when terminal rigidly connects into system or terminal when switching to new base station or moving velocity of terminal when surpassing the translational speed of base station sets in physical layer/data link layer control channel.
9. method as claimed in claim 8 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.
10. 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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| WO2010105566A1 (en) * | 2009-03-18 | 2010-09-23 | 中兴通讯股份有限公司 | Method and apparatus for transmitting channel state information-reference signals (csi-rs) in lte-a (long term evolution-advanced) system |
| WO2010121435A1 (en) * | 2009-04-24 | 2010-10-28 | Huawei Technologies Co., Ltd. | Method for generating reference signals |
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