CN101771437A - Transmission method for dedicated pilot frequency - Google Patents

Transmission method for dedicated pilot frequency Download PDF

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Publication number
CN101771437A
CN101771437A CN200810190129A CN200810190129A CN101771437A CN 101771437 A CN101771437 A CN 101771437A CN 200810190129 A CN200810190129 A CN 200810190129A CN 200810190129 A CN200810190129 A CN 200810190129A CN 101771437 A CN101771437 A CN 101771437A
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antenna port
mrow
ofdm symbol
slot
msubsup
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孙云锋
姜静
张峻峰
段亚军
朱常青
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ZTE Corp
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ZTE Corp
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Abstract

A transmission method for dedicated pilot frequency comprises the following steps: dedicated pilot frequencies for coordinated multi-point transmission are respectively sent by access nodes from an antenna port n1 and an antenna port n2; the dedicated pilot frequencies corresponding to the antenna port n1 and the antenna port n2 only exist in a resource block for transmitting a physical downlink shared channel (PDSCH); the dedicated pilot frequencies corresponding to the antenna port n1 and the dedicated pilot frequencies corresponding to the antenna port n2 are mapped to identical orthogonal frequency division multiplexing (OFDM) symbols and mutually orthogonal in frequency domain. The method enables the coordinated multi-point (CoMP) transmission technique to support space multiplexing, and can ensure reasonable pilot frequency expenses.

Description

Transmission method of special pilot frequency
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a method for transmitting dedicated pilots.
Background
In order to solve the problem of inter-cell interference while providing high throughput, a new generation wireless communication system (e.g., LTE-Advance (Long-Term Evolution Advance, LTE-a for short), IMT-Advance (International Mobile Telecommunication Advance, advanced International Mobile telecommunications, etc.) considers introducing a cooperative MIMO (Multiple Input and Multiple Output) technology between network levels. In LTE-Advance, a coordinated multi-point transmission (CoMP) technique has been formally studied as an alternative technique.
Because the antenna distances from the cell edge users to a plurality of adjacent cells are not different greatly, the interference problem of the users at the cell edge can be completely eliminated by utilizing the cooperation of the transmitting antennas of the plurality of cells to realize higher capacity and reliable transmission of wireless links at the cell edge. The multipoint cooperative transmission technology is characterized in that:
1) a UE (User Equipment) is served by cooperation (diversity, multiplexing, etc.) of a plurality of BSs (Base stations) on the same radio resource.
2) Each BS may serve one or more UEs simultaneously on the same radio resource.
Currently, each company has proposed its own view based on LTE in CoMP. Among them, the CoMP cooperative transmission method based on the antenna port 5(antenna port 5) is favored by most companies because it is compatible with the lte 8(long term evolution Release 8) user.
In LTE R8, a user-specific dedicated pilot (also referred to as user-specific reference signal or dedicated reference signal in LTE) is defined corresponding to the antenna port 5, and is used to assist in transmitting pdsch (physical downlink channel) data, where the pilot only exists when the antenna port 5 transmits data to the user terminal, the user can obtain information about whether the dedicated pilot exists according to a high-level control signaling, and the pilot position performs frequency hopping (frequency hopping) according to different cell IDs.
As shown in fig. 1a and fig. 1b, the mapping manner of the pilot sequence in the case of normal CP (normal cyclic prefix) and extended CP (extended cyclic prefix) of the dedicated pilot defined in LTE R8 is as follows:
a) normal CP case:
<math><mrow><msubsup><mi>a</mi><mrow><mi>k</mi><mo>,</mo><mi>l</mi></mrow><mrow><mo>(</mo><mi>p</mi><mo>)</mo></mrow></msubsup><mo>=</mo><mi>r</mi><mrow><mo>(</mo><mn>3</mn><mo>&CenterDot;</mo><msup><mi>l</mi><mo>&prime;</mo></msup><mo>&CenterDot;</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PDSCH</mi></msubsup><mo>+</mo><msup><mi>m</mi><mo>&prime;</mo></msup><mo>)</mo></mrow><mo>;</mo></mrow></math>
<math><mrow><mi>k</mi><mo>=</mo><mrow><mo>(</mo><msup><mi>k</mi><mo>&prime;</mo></msup><mo>)</mo></mrow><mi>mod</mi><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>+</mo><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>&CenterDot;</mo><msub><mi>n</mi><mi>PRB</mi></msub></mrow></math>
<math><mrow><msup><mi>k</mi><mo>&prime;</mo></msup><mo>=</mo><mfenced open='{' close=''><mtable><mtr><mtd><mn>4</mn><msup><mi>m</mi><mo>&prime;</mo></msup><mo>+</mo><msub><mi>v</mi><mi>shift</mi></msub></mtd><mtd><mi>ifl</mi><mo>&Element;</mo><mo>{</mo><mn>2,3</mn><mo>}</mo></mtd></mtr><mtr><mtd><mn>4</mn><msup><mi>m</mi><mo>&prime;</mo></msup><mo>+</mo><mrow><mo>(</mo><mn>2</mn><mo>+</mo><msub><mi>v</mi><mi>shift</mi></msub><mo>)</mo></mrow><mi>mod</mi><mn>4</mn></mtd><mtd><mi>ifl</mi><mo>&Element;</mo><mo>{</mo><mn>5,6</mn><mo>}</mo></mtd></mtr></mtable></mfenced></mrow></math>
<math><mrow><mi>l</mi><mo>=</mo><mfenced open='{' close=''><mtable><mtr><mtd><mn>3</mn></mtd><mtd><msup><mi>l</mi><mo>&prime;</mo></msup><mo>=</mo><mn>0</mn></mtd></mtr><mtr><mtd><mn>6</mn></mtd><mtd><msup><mi>l</mi><mo>&prime;</mo></msup><mo>=</mo><mn>1</mn></mtd></mtr><mtr><mtd><mn>2</mn></mtd><mtd><msup><mi>l</mi><mo>&prime;</mo></msup><mo>=</mo><mn>2</mn></mtd></mtr><mtr><mtd><mn>5</mn></mtd><mtd><msup><mi>l</mi><mo>&prime;</mo></msup><mo>=</mo><mn>2</mn></mtd></mtr></mtable></mfenced></mrow></math>
<math><mrow><msup><mi>l</mi><mrow><mo>&prime;</mo><mo>&prime;</mo></mrow></msup><mo>=</mo><mfenced open='{' close=''><mtable><mtr><mtd><mn>0,1</mn></mtd><mtd><mi>if</mi><msub><mi>n</mi><mi>s</mi></msub><mi>mod</mi><mn>2</mn><mo>=</mo><mn>0</mn></mtd></mtr><mtr><mtd><mn>2,3</mn></mtd><mtd><mi>if</mi><msub><mi>n</mi><mi>s</mi></msub><mi>mod</mi><mn>2</mn><mo>=</mo><mn>1</mn></mtd></mtr></mtable></mfenced></mrow></math>
<math><mrow><msup><mi>m</mi><mo>&prime;</mo></msup><mo>=</mo><mn>0,1</mn><mo>,</mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>,</mo><mn>3</mn><msubsup><mi>N</mi><mi>RB</mi><mi>PDSCH</mi></msubsup><mo>-</mo><mn>1</mn></mrow></math>
b) extended CP case:
<math><mrow><msubsup><mi>a</mi><mrow><mi>k</mi><mo>,</mo><mi>l</mi></mrow><mrow><mo>(</mo><mi>p</mi><mo>)</mo></mrow></msubsup><mo>=</mo><mi>r</mi><mrow><mo>(</mo><mn>4</mn><mo>&CenterDot;</mo><msup><mi>l</mi><mo>&prime;</mo></msup><mo>&CenterDot;</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PDSCH</mi></msubsup><mo>+</mo><msup><mi>m</mi><mo>&prime;</mo></msup><mo>)</mo></mrow><mo>;</mo></mrow></math>
<math><mrow><mi>k</mi><mo>=</mo><mrow><mo>(</mo><msup><mi>k</mi><mo>&prime;</mo></msup><mo>)</mo></mrow><mi>mod</mi><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>+</mo><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>&CenterDot;</mo><msub><mi>n</mi><mi>PRB</mi></msub></mrow></math>
<math><mrow><msup><mi>k</mi><mo>&prime;</mo></msup><mo>=</mo><mfenced open='{' close=''><mtable><mtr><mtd><mn>3</mn><msup><mi>m</mi><mo>&prime;</mo></msup><mo>+</mo><msub><mi>v</mi><mi>shift</mi></msub></mtd><mtd><mi>ifl</mi><mo>=</mo><mn>4</mn></mtd></mtr><mtr><mtd><mn>3</mn><msup><mi>m</mi><mo>&prime;</mo></msup><mo>+</mo><mrow><mo>(</mo><mn>2</mn><mo>+</mo><msub><mi>v</mi><mi>shift</mi></msub><mo>)</mo></mrow><mi>mod</mi><mn>3</mn></mtd><mtd><mi>ifl</mi><mo>=</mo><mn>1</mn></mtd></mtr></mtable></mfenced></mrow></math>
<math><mrow><mi>l</mi><mo>=</mo><mo></mo><mfenced open='{' close=''><mtable><mtr><mtd><mn>4</mn></mtd><mtd><msup><mi>l</mi><mo>&prime;</mo></msup><mo>&Element;</mo><mo>{</mo><mn>0,2</mn><mo>}</mo></mtd></mtr><mtr><mtd><mn>1</mn></mtd><mtd><msup><mi>l</mi><mo>&prime;</mo></msup><mo>=</mo><mn>1</mn></mtd></mtr></mtable></mfenced></mrow></math>
<math><mrow><msup><mi>l</mi><mo>&prime;</mo></msup><mo>=</mo><mfenced open='{' close=''><mtable><mtr><mtd><mn>0</mn></mtd><mtd><mi>if</mi><msub><mi>n</mi><mi>s</mi></msub><mi>mod</mi><mn>2</mn><mo>=</mo><mn>0</mn></mtd></mtr><mtr><mtd><mn>1,2</mn></mtd><mtd><mi>if</mi><msub><mi>n</mi><mi>s</mi></msub><mi>mod</mi><mn>2</mn><mo>=</mo><mn>1</mn></mtd></mtr></mtable></mfenced></mrow></math>
<math><mrow><msup><mi>m</mi><mo>&prime;</mo></msup><mo>=</mo><mn>0,1</mn><mo>,</mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>,</mo><mn>4</mn><msubsup><mi>N</mi><mi>RB</mi><mi>PDSCH</mi></msubsup><mo>-</mo><mn>1</mn></mrow></math>
wherein r (·) represents a pilot sequence;
Figure G2008101901298D0000031
a complex modulation symbol of a current subframe corresponding to antenna port 5(p ═ 5);
Figure G2008101901298D0000032
bandwidth represented by the number of RBs (Resource Block) when PDSCH transmission is represented;
Figure G2008101901298D0000033
the frequency domain size of the resource block expressed by the number of subcarriers; n isPRBRepresenting the frequency domain index of the RB, and firstly mapping according to the mode of increasing the frequency domain index in the mapping process of the pilot frequency sequence; m' is a UE-specific pilot signal resource element counter in each OFDM (Orthogonal Frequency Division Multiplexing) symbol; v. ofshiftFor a cell-specific frequency offset,
Figure G2008101901298D0000034
is a cell ID (identifier), nsIs the slot index.
In the prior art, only the antenna port 5 is used for CoMP, so that only air interface combining diversity gain can be realized, and spatial multiplexing cannot be realized. In order for the CoMP technology to support spatial multiplexing, the antenna ports need to be extended.
Disclosure of Invention
The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a transmission method for dedicated pilot, so that the CoMP technology can support spatial multiplexing.
In order to solve the above problem, the present invention provides a method for transmitting dedicated pilots, comprising:
the access node respectively sends special pilot frequency for realizing multipoint cooperative transmission at an antenna port n1 and an antenna port n 2;
the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 only exist on a resource block for transmitting a Physical Downlink Shared Channel (PDSCH);
the dedicated pilot corresponding to the antenna port n1 and the dedicated pilot corresponding to the antenna port n2 are mapped to the same orthogonal frequency division multiplexing OFDM symbol and are orthogonal to each other in the frequency domain.
In addition, the time domain pilot density of the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 occupies 2 OFDM symbols for each subframe.
In addition, under the normal CP condition, the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 are mapped to the 6 th OFDM symbol of the 2 i-th slot and the 7 th or 4 th OFDM symbol of the 2i + 1-th slot;
i is an integer of 0 or more.
In addition, in the case of extended CP, the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 are mapped to the 6 th OFDM symbol of the 2 i-th slot and the 6 th or 3 rd OFDM symbol of the 2i + 1-th slot;
i is an integer of 0 or more.
In addition, under the normal CP condition, the mapping position of the dedicated pilot corresponding to the antenna port n1 and the antenna port n2 in the time domain may be any one of the following:
(a) the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 are mapped to the 4 th OFDM symbol of the 2 i-th slot and the 6 th OFDM symbol of the 2i + 1-th slot; or
(b) The dedicated pilots corresponding to the antenna port n1 and the antenna port n2 are mapped to the 4 th OFDM symbol of the 2 i-th slot and the 3 rd OFDM symbol of the 2i + 1-th slot; or
(c) The dedicated pilots corresponding to the antenna port n1 and the antenna port n2 are mapped to the 7 th OFDM symbol of the 2 i-th slot and the 6 th OFDM symbol of the 2i + 1-th slot; or
(d) The dedicated pilots corresponding to the antenna port n1 and the antenna port n2 are mapped to the 7 th OFDM symbol of the 2 i-th slot and the 3 rd OFDM symbol of the 2i + 1-th slot;
i is an integer of 0 or more.
In addition, in the case of extended CP, the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 are both mapped to the 5 th OFDM symbol of the 2 i-th slot and the 5 th OFDM symbol of the 2i + 1-th slot;
i is an integer of 0 or more.
In addition, the mapping positions of the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 in the frequency domain are determined according to one or all of the following formulas, and the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 do not overlap in the frequency domain:
<math><mrow><mrow><mo>(</mo><mi>u</mi><mo>*</mo><msup><mi>m</mi><mo>&prime;</mo></msup><mo>+</mo><mrow><mo>(</mo><mn>2</mn><mo>+</mo><msub><mi>v</mi><mi>shift</mi></msub><mo>)</mo></mrow><mi>mod</mi><mi>u</mi><mo>)</mo></mrow><mi>mod</mi><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>+</mo><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>&CenterDot;</mo><msub><mi>n</mi><mi>PRB</mi></msub><mo>,</mo></mrow></math> and
<math><mrow><mrow><mo>(</mo><mi>u</mi><mo>*</mo><msup><mi>m</mi><mo>&prime;</mo></msup><mo>+</mo><msub><mi>v</mi><mi>shift</mi></msub><mo>)</mo></mrow><mi>mod</mi><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>+</mo><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>&CenterDot;</mo><msub><mi>n</mi><mi>PRB</mi></msub><mo>;</mo></mrow></math>
wherein u is a positive integer greater than 1;
Figure G2008101901298D0000051
vshiftis a frequency offset;the frequency domain size of the resource block expressed by the number of subcarriers; n isPRBA frequency domain index representing a resource block,the bandwidth is represented by the number of resource blocks when PDSCH transmission is represented.
In addition, the frequency domain mapping positions of the dedicated pilots corresponding to the antenna port n1 in adjacent time slots are different;
the frequency domain mapping positions of the dedicated pilots corresponding to the antenna port n2 in adjacent time slots are different.
In addition, vshiftThe value can be obtained by one of the following modes:
(A) order to v shift = N ID cell mod u ; Or
(B) Let vshiftA fixed constant value less than u; or
(C) Let vshiftA collaboration domain ID mod w;
wherein,
Figure G2008101901298D0000055
for the access node identifier ID, w is a positive integer greater than 1, and the cooperation domain IDs of different cooperation domains are different.
The invention also provides a special pilot frequency transmission method, which comprises the following steps:
the access node respectively sends special pilot frequency for realizing multipoint cooperative transmission at an antenna port n1 and an antenna port n 2;
the special pilot corresponding to the antenna port n1 and the antenna port n2 only exists on the resource block for transmitting the PDSCH;
the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 are mapped to different OFDM symbols respectively.
In addition, the time domain pilot density of the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 occupies 1 or 2 OFDM symbols for each subframe.
In addition, under the normal CP condition, the dedicated pilot corresponding to the antenna port n1 is mapped to the 4 th OFDM symbol of the 2 i-th slot and the 3 rd OFDM symbol of the 2i + 1-th slot; the dedicated pilot corresponding to the antenna port n2 is mapped to the 7 th OFDM symbol of the 2 i-th time slot and the 6 th OFDM symbol of the 2i + 1-th time slot;
i is an integer of 0 or more.
In addition, in the case of the extended CP, the dedicated pilot corresponding to the antenna port n1 is mapped to the 5 th OFDM symbol of the 2i slot and the 5 th OFDM symbol of the 2i +1 slot, and the dedicated pilot corresponding to the antenna port n2 is mapped to the 2 nd OFDM symbol of the 2i +1 slot;
i is an integer of 0 or more.
In addition, the mapping positions of the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 in the frequency domain are determined according to one or all of the following formulas:
<math><mrow><mrow><mo>(</mo><mi>u</mi><mo>*</mo><msup><mi>m</mi><mo>&prime;</mo></msup><mo>+</mo><mrow><mo>(</mo><mn>2</mn><mo>+</mo><msub><mi>v</mi><mi>shift</mi></msub><mo>)</mo></mrow><mi>mod</mi><mi> u</mi><mo>)</mo></mrow><mi>mod</mi><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>+</mo><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>&CenterDot;</mo><msub><mi>n</mi><mi>PRB</mi></msub><mo>,</mo></mrow></math> and
<math><mrow><mrow><mo>(</mo><mi>u</mi><mo>*</mo><msup><mi>m</mi><mo>&prime;</mo></msup><mo>+</mo><msub><mi>v</mi><mi>shift</mi></msub><mo>)</mo></mrow><mi>mod</mi><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>+</mo><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>&CenterDot;</mo><msub><mi>n</mi><mi>PRB</mi></msub><mo>;</mo></mrow></math>
wherein u is a positive integer greater than 1;
Figure G2008101901298D0000063
vshiftis a frequency offset;frequency domain of resource block expressed by number of sub-carriersSize; n isPRBA frequency domain index representing a resource block;
Figure G2008101901298D0000065
the bandwidth is represented by the number of resource blocks when PDSCH transmission is represented.
In addition, the frequency domain mapping positions of the dedicated pilots corresponding to the antenna port n1 in adjacent time slots are different;
the frequency domain mapping positions of the dedicated pilots corresponding to the antenna port n2 in adjacent time slots are different.
In addition, vshiftThe value can be obtained by one of the following modes:
(A) order to v shift = N ID cell mod u ; Or
(B) Let vshiftA fixed constant value less than u; or
(C) Let vshiftA collaboration domain ID mod w;
wherein,
Figure G2008101901298D0000067
for the access node identifier ID, w is a positive integer greater than 1, and the cooperation domain IDs of different cooperation domains are different.
By adopting the method of the invention, the CoMP technology can support spatial multiplexing and can obtain more reasonable pilot frequency overhead. In addition, since the dedicated pilots for CoMP exist only on the resource blocks for transmitting Physical Downlink Shared Channel (PDSCH) data, they can be transmitted with the antenna port 5 defined in LTE in case of needing a compatible LTE terminal; when the resources allocated for CoMP are for the low-speed LTE-a terminal, the newly defined port may be used for transmission and the spatial multiplexing gain is obtained.
Drawings
Fig. 1a is a diagram illustrating dedicated pilot mapping of an antenna port 5 under a normal CP condition in the prior art;
fig. 1b is a diagram illustrating dedicated pilot mapping of an antenna port 5 in the case of extended CP in the prior art;
FIG. 2 is a flow chart of a method for transmitting dedicated pilots according to an embodiment of the present invention;
FIG. 3a is a diagram illustrating the mapping of dedicated pilots for antenna port n1 and antenna port n2 under normal CP condition according to the first embodiment of the present invention;
fig. 3b is a diagram illustrating the mapping of dedicated pilots for antenna port n1 and antenna port n2 in the case of the extended CP according to the first embodiment of the present invention;
FIG. 4a is a diagram illustrating the mapping of dedicated pilots for antenna port n1 and antenna port n2 under normal CP condition according to the second embodiment of the present invention;
fig. 4b is a diagram illustrating the mapping of dedicated pilots for antenna port n1 and antenna port n2 in the case of the extended CP according to the second embodiment of the present invention;
FIG. 5a is a diagram illustrating the mapping of dedicated pilots for antenna port n1 and antenna port n2 under normal CP condition according to the third embodiment of the present invention;
fig. 5b is a diagram illustrating the mapping of dedicated pilots for antenna port n1 and antenna port n2 in the case of the extended CP according to the third embodiment of the present invention.
Detailed Description
The core idea of the present invention is to define two or more antenna ports (hereinafter, only two antenna ports are defined as antenna port n1 and antenna port n2) and corresponding dedicated pilots for transmission of PDSCH in coordinated multipoint transmission in order to make CoMP support spatial multiplexing.
The present invention will be described in detail below with reference to the drawings and examples.
Fig. 2 is a flowchart of a transmission method of dedicated pilots according to an embodiment of the present invention, and as shown in fig. 2, the method includes the following steps:
200: in order to make CoMP support spatial multiplexing, antenna port n1 and antenna port n2 and corresponding user-specific dedicated pilots (simply dedicated pilots) are defined; the antenna port n1 and the antenna port n2 and corresponding dedicated pilots are used for the transmission of PDSCH in cooperation with multiple access nodes (e.g., base station, relay station); the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 only exist on the resource blocks used for transmitting the PDSCH (i.e. the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 are transmitted only when the PDSCH allocated to a certain user is transmitted), and the communication system high layer informs the user whether the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 exist (i.e. whether the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 are transmitted).
201: and mapping the special pilot corresponding to the antenna port n1 and the antenna port n2 on a resource block for transmitting the PDSCH.
Since CoMP, especially in CoMP spatial multiplexing, is mainly suitable for low-speed users, the time domain insertion density (i.e., the time domain pilot density) of the dedicated pilots corresponding to antenna port n1 and antenna port n2 is 1/2 of the time domain insertion density of the dedicated pilots corresponding to antenna port 5 in the case of normal CP, and is 2/3 or 1/3 of the time domain insertion density of the dedicated pilots corresponding to antenna port 5 in the case of extended CP.
In the multi-antenna port transmission scheme, the frequency domain pilot density of the antenna port n1 and the antenna port n2 is the same as or equivalent to the frequency domain pilot density of the antenna port 5 in 3GPP 36.211.
The dedicated pilot mapping method of the present invention will be described with reference to the accompanying drawings.
(1) First mapping embodiment
In this embodiment, the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 are mapped to OFDM symbols that are not occupied by the common pilots and the dedicated pilots corresponding to the antenna port 5, and the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 are mapped to the same OFDM symbols.
In the normal CP case, the OFDM symbols occupied by the common pilot are the 1 st, 2 nd, 5 th OFDM symbols (1 ═ 0, 1, 4) of the 2i (i is an integer greater than or equal to 0, and the same applies hereinafter) slots (slots) and the 1 st, 2 nd, 5 th OFDM symbols (1 ═ 0, 1, 4) of the 2i +1 th slots; the dedicated pilots corresponding to the antenna port 5 are located in the 4 th and 7 th OFDM symbols (1 ═ 3 and 6) of the 2 i-th slot and the 3 rd and 6 th OFDM symbols (1 ═ 2 and 5) of the 2i + 1-th slot.
Under the condition of the extended CP, the OFDM symbols occupied by the common pilot frequency are the 1 st, 2 nd and 4 th OFDM symbols of the 2i th time slot and the 1 st, 2 nd and 4 th OFDM symbols of the 2i +1 th time slot; the dedicated pilot corresponding to the antenna port 5 is located in the 5 th OFDM symbol of the 2 i-th slot and the 2 nd, 5 th OFDM symbols of the 2i +1 th slot.
(1.1) Normal CP Condition
Under the normal CP condition, the dedicated pilots corresponding to antenna port n1 and antenna port n2 are located in the 6 th OFDM symbol of the 2 i-th slot and the 7 th or 4 th OFDM symbol of the 2i + 1-th slot in the time domain, as shown in fig. 3 a.
Under the normal CP condition, the frequency domain position (i.e., the position of the OFDM symbol) of the dedicated pilot corresponding to the antenna port n1 and the antenna port n2 in the 2 i-th slot is expressed as any one of (a1) and (a2) by the following formula:
<math><mrow><mrow><mo>(</mo><mi>a</mi><mn>1</mn><mo>)</mo></mrow><mo>,</mo><mrow><mo>(</mo><mi>u</mi><mo>*</mo><msup><mi>m</mi><mo>&prime;</mo></msup><mo>+</mo><msub><mi>v</mi><mi>shift</mi></msub><mo>)</mo></mrow><mi>mod</mi><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>+</mo><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>&CenterDot;</mo><msub><mi>n</mi><mi>PRB</mi></msub></mrow></math> and
<math><mrow><mrow><mo>(</mo><mi>u</mi><mo>*</mo><msup><mi>m</mi><mo>&prime;</mo></msup><mo>+</mo><mrow><mo>(</mo><mn>2</mn><mo>+</mo><msub><mi>v</mi><mi>shift</mi></msub><mo>)</mo></mrow><mi>mod</mi><mi>u</mi><mo>)</mo></mrow><msubsup><mrow><mi>mod</mi><mi>N</mi></mrow><mi>sc</mi><mi>RB</mi></msubsup><mo>+</mo><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>&CenterDot;</mo><msub><mi>n</mi><mi>PRB</mi></msub><mo>;</mo></mrow></math>
<math><mrow><mrow><mo>(</mo><mi>a</mi><mn>2</mn><mo>)</mo></mrow><mo>,</mo><mrow><mo>(</mo><mi>u</mi><mo>*</mo><msup><mi>m</mi><mo>&prime;</mo></msup><mo>+</mo><mrow><mo>(</mo><mn>2</mn><mo>+</mo><msub><mi>v</mi><mi>shift</mi></msub><mo>)</mo></mrow><mi>mod</mi><mi> u</mi><mo>)</mo></mrow><mi>mod</mi><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>+</mo><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>&CenterDot;</mo><msub><mi>n</mi><mi>PRB</mi></msub></mrow></math> and
<math><mrow><mrow><mo>(</mo><mi>u</mi><mo>*</mo><msup><mi>m</mi><mo>&prime;</mo></msup><mo>+</mo><msub><mi>v</mi><mi>shift</mi></msub><mo>)</mo></mrow><mi>mod</mi><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>+</mo><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>&CenterDot;</mo><msub><mi>n</mi><mi>PRB</mi></msub><mo>.</mo></mrow></math>
under the normal CP condition, the frequency domain positions of the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 in the 2i +1 th slot (i.e., the positions where the OFDM symbols are located) are expressed by formula as any one of the above-mentioned (a1) and (a 2).
Wherein u in the above formula isA positive integer greater than 1, preferably 4, wherein <math><mrow><msup><mi>m</mi><mo>&prime;</mo></msup><mo>=</mo><mn>0,1</mn><mo>,</mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>,</mo><mfrac><mn>12</mn><mi>u</mi></mfrac><msubsup><mi>N</mi><mi>RB</mi><mi>PDSCH</mi></msubsup><mo>-</mo><mn>1</mn><mo>.</mo></mrow></math>
(1.2) extended CP case
Under the extended CP condition, the mapping positions of the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 in the time domain are the 6 th OFDM symbol of the 2 i-th slot and the 6 th or 3 rd OFDM symbol of the 2i + 1-th slot, as shown in fig. 3 b.
In the extended CP case, the frequency domain position (i.e., the position of the OFDM symbol) of the dedicated pilot corresponding to the antenna port n1 and the antenna port n2 in the 2 i-th slot is expressed by a formula as any one of the above (a1) and (a 2); the frequency domain position of the dedicated pilot corresponding to the antenna port n1 and the antenna port n2 in the 2i +1 th slot (i.e., the position where the OFDM symbol is located) is expressed by formula as any one of the above-mentioned (a1) and (a 2). Wherein the preferred value of u is 3.
V aboveshiftFrequency offsets for different cells or different cooperation domains. In the frequency domain offset mode, since the common pilot defined in 3GPP 36.211 and the dedicated pilot corresponding to the antenna port 5 are not on the same OFDM symbol, it is beneficial to design frequency hopping according to the characteristics of cooperation. E.g. vshiftFrequency domain hopping may be performed according to the cooperation domain ID.
(2) Second mapping embodiment
In this embodiment, the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 reuse OFDM symbols occupied by the dedicated pilots corresponding to the antenna port 5, so that the insertion density of the pilots is reduced in the time domain, and the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 are mapped to the same OFDM symbols.
(2.1) Normal CP Condition
Under the normal CP condition, the mapping positions of the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 in the time domain may be any one of the following:
(a) the dedicated pilots corresponding to antenna port n1 and antenna port n2 are located in the 4 th OFDM symbol of the 2 i-th slot and the 6 th OFDM symbol of the 2i + 1-th slot, as shown in fig. 4 a; or
(b) The dedicated pilots corresponding to the antenna port n1 and the antenna port n2 are both located in the 4 th OFDM symbol of the 2 i-th slot and the 3 rd OFDM symbol of the 2i + 1-th slot; or
(c) The dedicated pilots corresponding to the antenna port n1 and the antenna port n2 are located in the 7 th OFDM symbol of the 2 i-th slot and the 6 th OFDM symbol of the 2i + 1-th slot; or
(d) The dedicated pilots corresponding to antenna port n1 and antenna port n2 are located in the 7 th OFDM symbol of the 2 i-th slot and the 3 rd OFDM symbol of the 2i + 1-th slot.
Under the normal CP condition, the frequency domain position (i.e. the position of the OFDM symbol) of the dedicated pilot corresponding to the antenna port n1 and the antenna port n2 in the 2 i-th slot is expressed by a formula as any one of the above (a1) and (a 2); the frequency domain position of the dedicated pilot corresponding to the antenna port n1 and the antenna port n2 in the 2i +1 th slot (i.e., the position where the OFDM symbol is located) is expressed by formula as any one of the above-mentioned (a1) and (a 2).
(2.2) extended CP case
Under the extended CP condition, the mapping positions of the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 in the time domain are the 5 th OFDM symbol of the 2 i-th slot and the 5 th OFDM symbol of the 2i + 1-th slot, as shown in fig. 4 b.
In addition, in the case of the extended CP, the mapping positions of the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 in the time domain may also be the 5 th OFDM symbol of the 2 i-th slot and the 3 rd OFDM symbol of the 2i + 1-th slot.
In the extended CP case, the frequency domain position (i.e., the position of the OFDM symbol) of the dedicated pilot corresponding to the antenna port n1 and the antenna port n2 in the 2 i-th slot is expressed by a formula as any one of the above (a1) and (a 2); the frequency domain position of the dedicated pilot corresponding to the antenna port n1 and the antenna port n2 in the 2i +1 th slot (i.e., the position where the OFDM symbol is located) is expressed by formula as any one of the above-mentioned (a1) and (a 2).
The commonalities of the above examples are: the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 are mapped onto the same OFDM symbol and are orthogonal in the frequency domain (that is, resource elements (resource elements) to which the dedicated pilot corresponding to the antenna port n1 is mapped and resource elements to which the dedicated pilot corresponding to the antenna port n2 is mapped are located on the same OFDM symbol, but correspond to different resource elements in the frequency domain, that is, the positions in the frequency domain do not overlap).
(3) Third mapping embodiment
In this embodiment, the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 reuse OFDM symbols occupied by the dedicated pilots corresponding to the antenna port 5, so that the insertion density of the pilots is reduced in the time domain, and the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 are respectively mapped to different OFDM symbols.
(3.1) Normal CP Condition
In the case of normal CP, the mapping position of the dedicated pilot corresponding to antenna port n1 and antenna port n2 in the time domain may be one of the following cases:
(e) the dedicated pilot corresponding to antenna port n1 is located in the 4 th OFDM symbol of the 2i slot and the 3 rd OFDM symbol of the 2i +1 slot, and the dedicated pilot corresponding to antenna port n2 is located in the 7 th OFDM symbol of the 2i slot and the 6 th OFDM symbol of the 2i +1 slot, as shown in fig. 5 a; or
(f) The dedicated pilot corresponding to antenna port n1 is located in the 7 th OFDM symbol of the 2i slot and the 6 th OFDM symbol of the 2i +1 slot, and the dedicated pilot corresponding to antenna port n2 is located in the 4 th OFDM symbol of the 2i slot and the 3 rd OFDM symbol of the 2i +1 slot.
Under the normal CP condition, the frequency domain positions (i.e. the positions of the OFDM symbols) of the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 in the 2 i-th slot and the 2i + 1-th slot are expressed by the following formula:
<math><mrow><mrow><mo>(</mo><mi>u</mi><mo>*</mo><msup><mi>m</mi><mo>&prime;</mo></msup><mo>+</mo><msub><mi>v</mi><mi>shift</mi></msub><mo>)</mo></mrow><mi>mod</mi><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>+</mo><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>&CenterDot;</mo><msub><mi>n</mi><mi>PRB</mi></msub><mo>,</mo></mrow></math> or
<math><mrow><mrow><mo>(</mo><mi>u</mi><mo>*</mo><msup><mi>m</mi><mo>&prime;</mo></msup><mo>+</mo><mrow><mo>(</mo><mn>2</mn><mo>+</mo><msub><mi>v</mi><mi>shift</mi></msub><mo>)</mo></mrow><mi>mod</mi><mi> u</mi><mo>)</mo></mrow><mi>mod</mi><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>+</mo><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>&CenterDot;</mo><msub><mi>n</mi><mi>PRB</mi></msub><mo>.</mo></mrow></math>
Wherein u in the above formula is a positive integer greater than 1, and preferably u takes a value of 4. <math><mrow><msup><mi>m</mi><mo>&prime;</mo></msup><mo>=</mo><mn>0,1</mn><mo>,</mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>,</mo><mfrac><mn>12</mn><mi>u</mi></mfrac><msubsup><mi>N</mi><mi>RB</mi><mi>PDSCH</mi></msubsup><mo>-</mo><mn>1</mn><mo>.</mo></mrow></math>
As shown in fig. 5a, the frequency domain position of the dedicated pilot corresponding to antenna port n1 in the 4 th OFDM symbol of the 2 i-th slot is the same as the frequency domain position of the dedicated pilot corresponding to antenna port n2 in the 6 th OFDM symbol of the 2i + 1-th slot; the frequency domain position of the dedicated pilot corresponding to antenna port n1 in the 7 th OFDM symbol of the 2 i-th slot is the same as the frequency domain position of the dedicated pilot corresponding to antenna port n2 in the 3 rd OFDM symbol of the 2i + 1-th slot.
(3.2) extended CP case
In the extended CP case, the mapping positions of the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 in the time domain may be: antenna port n1 is located at the 5 th OFDM symbol of the 2 i-th slot and the 5 th OFDM symbol of the 2i + 1-th slot, and antenna port n2 is located at the 2 nd OFDM symbol of the 2i + 1-th slot, as shown in fig. 5b, or else.
In the extended CP case, the frequency domain positions (i.e. the positions of the OFDM symbols) of the dedicated pilots corresponding to antenna port n1 and antenna port n2 in the 2 i-th slot and the 2i + 1-th slot are expressed by the following formula:
<math><mrow><mrow><mo>(</mo><mi>u</mi><mo>*</mo><msup><mi>m</mi><mo>&prime;</mo></msup><mo>+</mo><msub><mi>v</mi><mi>shift</mi></msub><mo>)</mo></mrow><mi>mod</mi><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>+</mo><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>&CenterDot;</mo><msub><mi>n</mi><mi>PRB</mi></msub><mo>,</mo></mrow></math> or
<math><mrow><mrow><mo>(</mo><mi>u</mi><mo>*</mo><msup><mi>m</mi><mo>&prime;</mo></msup><mo>+</mo><mrow><mo>(</mo><mn>2</mn><mo>+</mo><msub><mi>v</mi><mi>shift</mi></msub><mo>)</mo></mrow><mi>mod</mi><mi> u</mi><mo>)</mo></mrow><mi>mod</mi><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>+</mo><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>&CenterDot;</mo><msub><mi>n</mi><mi>PRB</mi></msub><mo>.</mo></mrow></math>
Wherein u in the above formula is a positive integer greater than 1, and preferably u is takenThe value is 3. <math><mrow><msup><mi>m</mi><mo>&prime;</mo></msup><mo>=</mo><mn>0,1</mn><mo>,</mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>,</mo><mfrac><mn>12</mn><mi>u</mi></mfrac><msubsup><mi>N</mi><mi>RB</mi><mi>PDSCH</mi></msubsup><mo>-</mo><mn>1</mn><mo>.</mo></mrow></math>
Further, in the above embodiments, vshiftThe value of (A) can be obtained by one of the following modes:
(A) the offset is performed in the manner in 3GPP 36.211, i.e.
Figure G2008101901298D0000127
Or
(B) Let vshiftA fixed constant value less than u; or
(C) Each access node in each cooperation domain adopts the same vshiftDifferent v for each access node in different cooperation domainsshift(ii) a Defining collaboration Domain IDs, v, for different collaboration domainsshiftA collaboration domain ID mod w, where w is a positive integer greater than 1; by adopting the mode, the hopping modes of the access nodes in the same cooperation domain can be unified, mapping is carried out according to a unified carrier mode, and empty port combination is easy to carry out.
202: RBs to which PDSCH data and dedicated pilots are mapped are transmitted at antenna port n1 and antenna port n 2.
Of course, two types of transmission may be defined: a single antenna port transmission mode and a multi-antenna port transmission mode; when the single antenna port is used for transmission, the antenna port 5 defined by 3GPP 36.211 is used for transmission; and in the multi-antenna port transmission, two or more newly defined special antenna ports are used for transmission.

Claims (16)

1. A method for transmitting dedicated pilots, the method comprising:
the access node respectively sends special pilot frequency for realizing multipoint cooperative transmission at an antenna port n1 and an antenna port n 2;
the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 only exist on a resource block for transmitting a Physical Downlink Shared Channel (PDSCH);
the dedicated pilot corresponding to the antenna port n1 and the dedicated pilot corresponding to the antenna port n2 are mapped to the same orthogonal frequency division multiplexing OFDM symbol and are orthogonal to each other in the frequency domain.
2. The method of claim 1,
the time domain pilot density of the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 occupies 2 OFDM symbols for each subframe.
3. The method of claim 1,
under the condition of normal cyclic prefix CP, the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 are mapped to the 6 th orthogonal frequency division multiplexing OFDM symbol of the 2i time slot and the 7 th or 4 th OFDM symbol of the 2i +1 time slot;
i is an integer of 0 or more.
4. The method of claim 1,
in the case of extended CP, the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 are mapped to the 6 th OFDM symbol of the 2i slot and the 6 th or 3 rd OFDM symbol of the 2i +1 th slot;
i is an integer of 0 or more.
5. The method of claim 1,
under the normal CP condition, the mapping position of the dedicated pilot corresponding to the antenna port n1 and the antenna port n2 in the time domain may be any one of the following:
(a) the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 are mapped to the 4 th OFDM symbol of the 2 i-th slot and the 6 th OFDM symbol of the 2i + 1-th slot; or
(b) The dedicated pilots corresponding to the antenna port n1 and the antenna port n2 are mapped to the 4 th OFDM symbol of the 2 i-th slot and the 3 rd OFDM symbol of the 2i + 1-th slot; or
(c) The dedicated pilots corresponding to the antenna port n1 and the antenna port n2 are mapped to the 7 th OFDM symbol of the 2 i-th slot and the 6 th OFDM symbol of the 2i + 1-th slot; or
(d) The dedicated pilots corresponding to the antenna port n1 and the antenna port n2 are mapped to the 7 th OFDM symbol of the 2 i-th slot and the 3 rd OFDM symbol of the 2i + 1-th slot;
i is an integer of 0 or more.
6. The method of claim 1,
under the extended CP condition, the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 are both mapped to the 5 th OFDM symbol of the 2 i-th slot and the 5 th OFDM symbol of the 2i + 1-th slot;
i is an integer of 0 or more.
7. The method according to any one of claims 3 to 6,
the mapping positions of the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 in the frequency domain are determined according to one or all of the following formulas, and the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 do not overlap in the frequency domain:
<math><mrow><mrow><mo>(</mo><mi>u</mi><mo>*</mo><msup><mi>m</mi><mo>&prime;</mo></msup><mo>+</mo><mrow><mo>(</mo><mn>2</mn><mo>+</mo><msub><mi>v</mi><mi>shift</mi></msub><mo>)</mo></mrow><mi>mod</mi><mi>u</mi><mo>)</mo></mrow><mi>mod</mi><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>+</mo><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>&CenterDot;</mo><msub><mi>n</mi><mi>PRB</mi></msub><mo>,</mo></mrow></math> and
<math><mrow><mrow><mo>(</mo><mi>u</mi><mo>*</mo><msup><mi>m</mi><mo>&prime;</mo></msup><mo>+</mo><msub><mi>v</mi><mi>shift</mi></msub><mo>)</mo></mrow><mi>mod</mi><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>+</mo><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>&CenterDot;</mo><msub><mi>n</mi><mi>PRB</mi></msub><mo>;</mo></mrow></math>
wherein u is a positive integer greater than 1;
Figure F2008101901298C0000023
vshiftis a frequency offset;
Figure F2008101901298C0000024
the frequency domain size of the resource block expressed by the number of subcarriers; n isPRBA frequency domain index representing a resource block,
Figure F2008101901298C0000025
the bandwidth is represented by the number of resource blocks when PDSCH transmission is represented.
8. The method of claim 7,
the frequency domain mapping positions of the dedicated pilots corresponding to the antenna port n1 in adjacent time slots are different;
the frequency domain mapping positions of the dedicated pilots corresponding to the antenna port n2 in adjacent time slots are different.
9. The method of claim 7,
vshiftthe value can be obtained by one of the following modes:
(A) order to
Figure F2008101901298C0000031
Or
(B) Let vshiftA fixed constant value less than u; or
(C) Let vshiftA collaboration domain ID mod w;
wherein,
Figure F2008101901298C0000032
identifying for access nodeSymbol ID, w is a positive integer greater than 1, and the cooperation domain IDs of different cooperation domains are different.
10. A method for dedicated pilot transmission, the method comprising:
the access node respectively sends special pilot frequency for realizing multipoint cooperative transmission at an antenna port n1 and an antenna port n 2;
the special pilot corresponding to the antenna port n1 and the antenna port n2 only exists on the resource block for transmitting the PDSCH;
the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 are mapped to different OFDM symbols respectively.
11. The method of claim 10,
the time domain pilot density of the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 occupies 1 or 2 OFDM symbols for each subframe.
12. The method of claim 10,
under the condition of normal CP, the dedicated pilot corresponding to the antenna port n1 is mapped to the 4 th OFDM symbol of the 2 i-th time slot and the 3 rd OFDM symbol of the 2i + 1-th time slot; the dedicated pilot corresponding to the antenna port n2 is mapped to the 7 th OFDM symbol of the 2 i-th time slot and the 6 th OFDM symbol of the 2i + 1-th time slot;
i is an integer of 0 or more.
13. The method of claim 10,
in the case of extended CP, the dedicated pilot corresponding to the antenna port n1 is mapped to the 5 th OFDM symbol of the 2i slot and the 5 th OFDM symbol of the 2i +1 slot, and the dedicated pilot corresponding to the antenna port n2 is mapped to the 2 nd OFDM symbol of the 2i +1 slot;
i is an integer of 0 or more.
14. The method of claim 12 or 13,
the mapping positions of the dedicated pilots corresponding to the antenna port n1 and the antenna port n2 in the frequency domain are determined according to one or all of the following formulas:
<math><mrow><mrow><mo>(</mo><mi>u</mi><mo>*</mo><msup><mi>m</mi><mo>&prime;</mo></msup><mo>+</mo><mrow><mo>(</mo><mn>2</mn><mo>+</mo><msub><mi>v</mi><mi>shift</mi></msub><mo>)</mo></mrow><mi>mod</mi><mi>u</mi><mo>)</mo></mrow><mi>mod</mi><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>+</mo><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>&CenterDot;</mo><msub><mi>n</mi><mi>PRB</mi></msub><mo>,</mo></mrow></math> and
<math><mrow><mrow><mo>(</mo><mi>u</mi><mo>*</mo><msup><mi>m</mi><mo>&prime;</mo></msup><mo>+</mo><msub><mi>v</mi><mi>shift</mi></msub><mo>)</mo></mrow><mi>mod</mi><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>+</mo><msubsup><mi>N</mi><mi>sc</mi><mi>RB</mi></msubsup><mo>&CenterDot;</mo><msub><mi>n</mi><mi>PRB</mi></msub><mo>;</mo></mrow></math>
wherein u is a positive integer greater than 1;
Figure F2008101901298C0000043
vshiftis a frequency offset;the frequency domain size of the resource block expressed by the number of subcarriers; n isPRBA frequency domain index representing a resource block;
Figure F2008101901298C0000045
the bandwidth is represented by the number of resource blocks when PDSCH transmission is represented.
15. The method of claim 14,
the frequency domain mapping positions of the dedicated pilots corresponding to the antenna port n1 in adjacent time slots are different;
the frequency domain mapping positions of the dedicated pilots corresponding to the antenna port n2 in adjacent time slots are different.
16. The method of claim 14,
vshiftthe value can be obtained by one of the following modes:
(A) order to
Figure F2008101901298C0000046
Or
(B) Let vshiftA fixed constant value less than u; or
(C) Let vshiftA collaboration domain ID mod w;
wherein,for the access node identifier ID, w is a positive integer greater than 1, and the cooperation domain IDs of different cooperation domains are different.
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Application publication date: 20100707