CN103117784A - Method and system improving group descending covering - Google Patents
Method and system improving group descending covering Download PDFInfo
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- CN103117784A CN103117784A CN2011103650440A CN201110365044A CN103117784A CN 103117784 A CN103117784 A CN 103117784A CN 2011103650440 A CN2011103650440 A CN 2011103650440A CN 201110365044 A CN201110365044 A CN 201110365044A CN 103117784 A CN103117784 A CN 103117784A
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Abstract
The invention provides a method and a system improving group descending covering. Sending of descending group signals is conducted in a method of sending diversity, on the basis that cell reference signals are sent by a station, and user experience (UE) special pilot frequency is inserted into the descending group signals. Therefore, user experience can obtain the cell reference signals and the UE special pilot frequency from the descending signals, and descending information channel estimation can be conducted according to the obtained cell reference signals and the UE special pilot frequency. The method and the system can improve performance of descending information channel estimation, and therefore improves descending covering on the premise that emitting power is no increased.
Description
Technical field
The present invention relates to mobile communication technology, particularly a kind of method and system that improve the descending covering of group.
Background technology
In the LTE group system, descending therefore descending cluster adopts original LTE protocol technology usually normally towards the communication of the point-to-multipoint of residential quarter, and descending use transmit diversity mode is carried out channel estimating and follow-up demodulation with cell reference signals.
Although above-mentioned prior art is compatible original system and agreement fully, may face the problem of descending covering.Because the send mode of descending cluster signal is similar to broadcasting, can not hold the feedback that obtains about channel, interference, data correctness from UE, so the selection of downlink transmission power and MCS (Modulation and Coding Scheme) is quite important; Arrange too pessimisticly, can cause excessive interference and power dissipation; Arrange too optimisticly, may cause edges cover not enough, make edge UE may not receive satisfied signal.
Summary of the invention
The invention provides a kind of method and system that improve the descending covering of group, be intended to not increase under the prerequisite of transmitting power, improve the performance that down channel is estimated, thereby improve descending covering.
A kind of method that improves the descending covering of group provided by the invention adopts the transmit diversity mode to carry out the transmission of descending cluster signal, comprising:
User terminal (UE) dedicated pilot is inserted in the base station in descending cluster signal on the basis of the cell reference signals of transmit diversity mode;
UE obtains cell reference signals and UE dedicated pilot from descending cluster signal, and carries out the down channel estimation according to the cell reference signals that obtains and UE dedicated pilot.
Preferably, described UE dedicated pilot is the UE dedicated pilot under descending control information format 2B (DCI format 2B).
Preferably, when the quantity of antenna port in group system was 2, the described UE dedicated pilot that inserts in descending cluster signal was:
Respectively at the UE dedicated pilot that inserts on described 2 antenna ports under DCI format 2B.
Preferably, more than or equal to 4 the time, the described UE dedicated pilot that inserts in descending cluster signal is as the quantity N of antenna port in group system:
UE dedicated pilot inserting on wherein 2 antenna ports of a described N antenna port under DCI format 2B does not insert the UE dedicated pilot to all the other antenna ports.
Preferably, more than or equal to 4 the time, the described UE dedicated pilot that inserts in descending cluster signal is as the quantity N of antenna port in group system:
At the UE dedicated pilot that inserts on wherein 2 antenna ports of a described N antenna port under DCI format 2B; The distributing position of UE dedicated pilot on frequency domain under DCI format 2B adjusted, inserted the UE dedicated pilot after adjusting on all the other antenna ports except described 2 antenna ports.
Preferably, described UE dedicated pilot is the UE dedicated pilot under descending control information format 1 (DCI format 1).
Preferably, more than or equal to 2 the time, the described UE dedicated pilot that inserts in descending cluster signal is as the quantity N of antenna port in group system:
Insert the UE dedicated pilot under DCI format 1 on wherein 1 antenna port of a described N antenna port, all the other antenna ports are not inserted the UE dedicated pilot.
Preferably, more than or equal to 2 the time, the described UE dedicated pilot that inserts in descending cluster signal is as the quantity N of antenna port in group system:
Insert the UE dedicated pilot under DCI format 1 on wherein 1 antenna port of a described N antenna port; The distributing position of 1 time UE dedicated pilot of DCI format on frequency domain adjusted, inserted the UE dedicated pilot after adjusting on all the other antenna ports except described 1 antenna port.
The present invention also provides a kind of system that improves the descending covering of group, comprising: base station and user terminal (UE), base station adopt the transmit diversity mode to carry out the transmission of descending cluster signal, wherein:
Described base station is used on the basis of the cell reference signals of transmit diversity mode, inserts the UE dedicated pilot in descending cluster signal;
Described UE is used for obtaining cell reference signals and UE dedicated pilot from descending cluster signal, and carries out the down channel estimation according to the cell reference signals that obtains and UE dedicated pilot.
Preferably, described UE dedicated pilot is UE dedicated pilot under descending control information format 2B (DCI format 2B) or the UE dedicated pilot under descending control information format 1 (DCI format 1).
As seen from the above technical solution, the present invention utilizes in the beam shaping function distinctive UE dedicated pilot to carry out down channel to estimate, increased pilot number, make UE can utilize simultaneously cell reference signals and UE dedicated pilot, improve the performance that down channel is estimated, thereby under the prerequisite that does not increase transmitting power, improved descending covering, and can access better demodulation performance.
Description of drawings
Fig. 1 is existing cell reference signals distribution schematic diagram;
Fig. 2 is the UE dedicated pilot distribution schematic diagram under existing DCI format 2B;
Fig. 3 is the UE dedicated pilot distribution schematic diagram under existing DCI format 1;
Fig. 4 is the schematic diagram of in a preferred embodiment of the present invention, the distributing position of UE dedicated pilot being expanded.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, referring to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
In trunked communication system, descending cluster signal adopts a kind of mode that is similar to broadcasting to send, and towards residential quarter and numerous UE, therefore, can not adopt beam shaping, and can only be with the transmit diversity mode that is similar to the send modes such as paging, system message.The transmit diversity mode utilizes cell reference signals to carry out channel estimating fully, then carries out the signal demodulation.When realizing the beam shaping function in the TDD system, do not need any relevant information of UE feedback, this is a key property of TDD system, the present invention utilizes this key property, propose: although can not carry out beam shaping in group system, but, can utilize in the beam shaping function distinctive UE dedicated pilot to carry out down channel estimates, make UE can utilize simultaneously cell reference signals and UE dedicated pilot, improve the performance that down channel is estimated, thereby under the prerequisite that does not increase transmitting power, improve descending covering.
Defined the beam shaping pattern under the tdd mode in the LTE agreement: the DCI format 2B (descending control information format 2B) in the DCIformat 1 in emission mode 7 (descending control information format 1) and emission mode 8, corresponding single current and double-current excipient respectively.Under these patterns, by insert the mode of UE dedicated pilot at data field, make UE to carry out channel estimating by cell reference signals again, but directly just can obtain channel estimating after excipient with the UE dedicated pilot.The descending excipient pattern of analog D CI format 1 of the present invention or 2B, on the basis of the reference signal that has the transmit diversity mode now, insert UE dedicated pilot (agreement regulation, reference signal corresponding to use port5, i.e. pilot tone during DCI format 1 under DCIformat 1 or 2B; Use reference signal corresponding to port7/8, i.e. pilot tone during DCI format 2B), but do not carry out actual beam shaping, thus increased pilot number, improved the performance of channel estimating.
The quantity of antenna port (antenna port) is as 2 in the group system, conventional CP is example, existing cell reference signals distributes as shown in Figure 1, UE dedicated pilot under existing DCI format 2B distributes as shown in Figure 2, UE dedicated pilot under existing DCI format 1 distributes as shown in Figure 3, and Fig. 1～Fig. 3 all selects from the 3GPP agreement.
Can be found out by distributing position illustrated in figures 1 and 2, under DCI format 2B, the distributing position of UE dedicated pilot and the distributing position of cell reference signals stagger fully.The UE dedicated pilot only is distributed on latter two symbol of each time slot, and on two ports, the position of pilot frequency sequence is overlapping (seeing the distributing position of R7 and R8 in Fig. 2).
Can be found out by Fig. 1 and distributing position shown in Figure 3, the distributing position of 1 time UE dedicated pilot of DCI format and the distributing position of cell reference signals also stagger fully.
Take Fig. 1 and Fig. 2 as example, the present invention is mapped to UE dedicated pilot R7 and R8 respectively on two antenna ports of group system, antenna port 7 is used as antenna port 0 that is:, and antenna port 8 is used as antenna port 1; Perhaps antenna port 7 is used as antenna port 1, antenna port 8 is used as antenna port 0, so, UE also will obtain UE dedicated pilot UE R7 and R8, thereby can improve channel estimating performance except obtaining cell reference signals, and expanded downstream covers.And higher pilot density also is conducive to the support to the UE high-speed mobile.
Usually, group system only need be used two-port, as port number N more than or equal to 4 the time, owing in agreement, the UE dedicated pilot under DCI format 2B only having been defined two ports, therefore, on the basis of technique scheme of the present invention, the modes of emplacement of UE dedicated pilot is expanded.
For example, the simplest, the UE dedicated pilot only can be corresponded on wherein two ports in an above-mentioned N port, all the other ports are not inserted the UE dedicated pilot.
Perhaps, further, can adjust the position of existing UE dedicated pilot on frequency domain, thereby obtain corresponding to the UE dedicated pilot of multiport more.For example, can the UE dedicated pilot of 2 ports be expanded to 4 ports according to as shown in Figure 4 mode.
In this example realized, the UE dedicated pilot is 4, interval subcarrier on frequency domain, therefore, when expanding, should have in theory 4 positions optional.Example shown in Figure 4 is to have selected the sub-carrier positions adjacent with existing UE dedicated pilot.
After the mode of having selected the expansion of UE dedicated pilot, need to redefine data to the mapping mode of resource element, the mapping principle is: the place that the UE dedicated pilot takies, can not carry again data.
For the DCI form of single port excipient, according to Fig. 3, the UE dedicated pilot is 3, interval subcarrier on frequency domain, therefore, should have in theory 3 positions optional, therefore, when expanding, can expand to 4 ports at most.
As seen from the above-described embodiment, the present invention utilizes in the beam shaping function distinctive UE dedicated pilot to carry out down channel to estimate, increased pilot number, make UE can utilize simultaneously cell reference signals and UE dedicated pilot, improve the performance that down channel is estimated, thereby under the prerequisite that does not increase transmitting power, improved descending covering, and can access better demodulation performance.
The above is only preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (10)
1. a method that improves the descending covering of group, adopt the transmit diversity mode to carry out the transmission of descending cluster signal, it is characterized in that:
User terminal (UE) dedicated pilot is inserted in the base station in descending cluster signal on the basis of the cell reference signals of transmit diversity mode;
UE obtains cell reference signals and UE dedicated pilot from descending cluster signal, and carries out the down channel estimation according to the cell reference signals that obtains and UE dedicated pilot.
2. method according to claim 1 is characterized in that:
Described UE dedicated pilot is the UE dedicated pilot under descending control information format 2B (DCI format 2B).
3. method according to claim 2 is characterized in that:
When the quantity of antenna port in group system was 2, the described UE dedicated pilot that inserts in descending cluster signal was:
Respectively at the UE dedicated pilot that inserts on described 2 antenna ports under DCI format 2B.
4. method according to claim 2 is characterized in that:
More than or equal to 4 the time, the described UE dedicated pilot that inserts in descending cluster signal is as the quantity N of antenna port in group system:
UE dedicated pilot inserting on wherein 2 antenna ports of a described N antenna port under DCI format 2B does not insert the UE dedicated pilot to all the other antenna ports.
5. method according to claim 2 is characterized in that:
More than or equal to 4 the time, the described UE dedicated pilot that inserts in descending cluster signal is as the quantity N of antenna port in group system:
At the UE dedicated pilot that inserts on wherein 2 antenna ports of a described N antenna port under DCI format 2B; The distributing position of UE dedicated pilot on frequency domain under DCI format 2B adjusted, inserted the UE dedicated pilot after adjusting on all the other antenna ports except described 2 antenna ports.
6. method according to claim 1 is characterized in that:
Described UE dedicated pilot is the UE dedicated pilot under descending control information format 1 (DCI format 1).
7. method according to claim 6 is characterized in that:
More than or equal to 2 the time, the described UE dedicated pilot that inserts in descending cluster signal is as the quantity N of antenna port in group system:
Insert the UE dedicated pilot under DCI format 1 on wherein 1 antenna port of a described N antenna port, all the other antenna ports are not inserted the UE dedicated pilot.
8. method according to claim 6 is characterized in that:
More than or equal to 2 the time, the described UE dedicated pilot that inserts in descending cluster signal is as the quantity N of antenna port in group system:
Insert the UE dedicated pilot under DCI format 1 on wherein 1 antenna port of a described N antenna port; The distributing position of 1 time UE dedicated pilot of DCI format on frequency domain adjusted, inserted the UE dedicated pilot after adjusting on all the other antenna ports except described 1 antenna port.
9. system that improves the descending covering of group comprises: base station and user terminal (UE), base station adopt the transmit diversity mode to carry out the transmission of descending cluster signal, it is characterized in that:
Described base station is used on the basis of the cell reference signals of transmit diversity mode, inserts the UE dedicated pilot in descending cluster signal;
Described UE is used for obtaining cell reference signals and UE dedicated pilot from descending cluster signal, and carries out the down channel estimation according to the cell reference signals that obtains and UE dedicated pilot.
10. system according to claim 9 is characterized in that:
Described UE dedicated pilot is UE dedicated pilot under descending control information format 2B (DCI format 2B) or the UE dedicated pilot under descending control information format 1 (DCI format 1).
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| CN2011103650440A CN103117784A (en) | 2011-11-17 | 2011-11-17 | Method and system improving group descending covering |
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| CN2011103650440A CN103117784A (en) | 2011-11-17 | 2011-11-17 | Method and system improving group descending covering |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104683990A (en) * | 2013-11-28 | 2015-06-03 | 北京信威通信技术股份有限公司 | A wireless coverage a method, device and system |
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| CN101841357A (en) * | 2009-03-16 | 2010-09-22 | 夏普株式会社 | Downlink data transmission method, base station and user equipment |
| EP2237440A2 (en) * | 2000-03-30 | 2010-10-06 | Qualcomm Incorporated | Method and apparatus for measuring and reporting channel state information in a high efficiency, high performance communications system |
| TW201115992A (en) * | 2009-03-13 | 2011-05-01 | Qualcomm Inc | Channel estimation based upon user specific and common reference signals |
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| EP2237440A2 (en) * | 2000-03-30 | 2010-10-06 | Qualcomm Incorporated | Method and apparatus for measuring and reporting channel state information in a high efficiency, high performance communications system |
| CN101291306A (en) * | 2007-04-18 | 2008-10-22 | 中兴通讯股份有限公司 | WiMAX compatible systematic pilot design method and channel estimating method based on the pilot |
| CN101431355A (en) * | 2007-11-07 | 2009-05-13 | 中兴通讯股份有限公司 | Signal channel detection method for long-term evolution system |
| TW201115992A (en) * | 2009-03-13 | 2011-05-01 | Qualcomm Inc | Channel estimation based upon user specific and common reference signals |
| CN101841357A (en) * | 2009-03-16 | 2010-09-22 | 夏普株式会社 | Downlink data transmission method, base station and user equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104683990A (en) * | 2013-11-28 | 2015-06-03 | 北京信威通信技术股份有限公司 | A wireless coverage a method, device and system |
| WO2015078399A1 (en) * | 2013-11-28 | 2015-06-04 | 北京信威通信技术股份有限公司 | Wireless coverage method, device and system |
| CN104683990B (en) * | 2013-11-28 | 2019-04-05 | 北京信威通信技术股份有限公司 | A kind of methods, devices and systems of wireless coverage |
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Application publication date: 20130522 |