CN101944946A - Wireless communication system and method and method for transmitting pilot frequency in wireless communication system - Google Patents

Abstract

The present invention discloses a wireless communication system and method and a method for sending pilots in the wireless communication system. The method for sending pilots in the wireless communication system includes: broadcasting, multicasting, and/or grouping of base stations in downlink subframes The pilot is sent to the terminal in the broadcast service area, wherein the pilot of the downlink subframe meets the following conditions: in each physical resource block of the downlink subframe, the number of pilots corresponding to each data stream is one of 6-11 of natural numbers. The present invention can increase the pilot frequency density in the frequency domain, thereby improving the quality of channel estimation and improving the overall performance of the system, so the wireless communication system and method of the present invention can meet the needs of broadcasting services.

Description

Wireless communication system and method and method for transmitting pilot in wireless communication system

technical field

The present invention relates to the communication field, and in particular, to a wireless communication system and a wireless communication method, and to a pilot frequency and method for sending in the wireless communication system.

Background technique

Multicast and broadcast are technologies for transmitting data packets from one data source to multiple destinations. In traditional mobile networks, Cell Broadcast Service (CBS for short) allows low bit rate data to be sent to all users through the cell shared broadcast channel, which is a message service. Now, people's demand for mobile communication is no longer satisfied with telephone and messaging services. With the rapid development of the Internet, a large number of multimedia services have emerged, some of which require multiple users to receive the same data at the same time, for example, video on demand , TV broadcasting, video conferencing, online education, interactive games, etc. Compared with general data, these mobile multimedia services have the characteristics of large data volume, long duration, and delay sensitivity. At present, the point-to-multipoint broadcasting service (for example, cell broadcasting) can only carry out short message service in text format, which cannot meet the requirements of diversified services such as audio, video and data. In order to effectively utilize mobile network resources, Multimedia Broadcast/Multicast Service (referred to as MBMS) was proposed in the third-generation and fourth-generation wireless communication standards, such as multicast in the IEEE 802.16m standard. Broadcast service (Multicast Broadcast Service, referred to as MBS) and enhanced multicast broadcast service (Enhanced Multcast Broadcast Service, referred to as E-MBS).

Because the current wireless communication system only considers common personal communication service scenarios when designing downlink pilots, but does not consider broadcast service scenarios. However, the wireless channel delay corresponding to the personal communication service application scenario is relatively small, and for the broadcast service scenario, especially the same frequency network (Same Frequency Network, referred to as SFN) broadcast application scenario, the signal received by each receiving end is from Samples of multiple surrounding base stations after different delays. Therefore, from the perspective of the receiving end, the corresponding wireless channel has a very large multipath delay, and the delay path is very rich, which makes the broadcast service channel The channel has greater frequency selective fading, so the pilot format under the common traffic channel is no longer suitable for the broadcast business scenario.

Contents of the invention

The present invention is made in consideration of the above-mentioned problems, for this reason, the main purpose of the present invention is to provide a kind of wireless communication system and method, and a kind of method for sending pilot frequency in the wireless communication system, to solve the common traffic channel in the prior art The following pilot format is not applicable to the broadcasting service.

In order to achieve the above object, according to one aspect of the present invention, a method for sending pilots in a wireless communication system is provided, including: the base station transmits to the terminal in the broadcast, multicast, and/or multicast service area in the downlink subframe Sending pilots, wherein the pilots of the downlink subframe meet the following conditions: in each physical resource block of the downlink subframe, the number of pilots corresponding to each data stream is a natural number of one of 6-11.

Preferably, the pilots corresponding to each data stream also meet the following conditions: each data stream contains no more than two pilots on all carriers of the same time-domain symbol in each physical resource block.

Preferably, the pilots corresponding to each data stream also meet the following condition: the interval between adjacent pilots corresponding to each data stream in the frequency domain does not exceed 4 subcarriers in the frequency domain.

Preferably, the pilot frequency corresponding to each data stream also meets the following condition: in the physical resource block, at least 2 time domain symbols meet the following condition: each time domain symbol of each data stream in at least 2 time domain symbols contains 2 pilots, and the absolute value of the difference between the indexes of at least 2 time-domain symbols is greater than or equal to 2.

Preferably, the pilot corresponding to at least one of the data streams sent by the base station meets the following conditions: the relative index of the carrier occupied in the physical resource block is an odd number, where the relative index of the carrier is the time when the carrier is located relative to the carrier Index of the first carrier on the domain symbol.

Preferably, when the number of data streams sent by the base station is one, the relative index of the carrier occupied by the pilot corresponding to the data stream sent by the base station in the physical resource block is an odd number; the number of data streams sent by the base station is two In the case of , the relative index of the carrier occupied by the pilot in the physical resource block corresponding to the first data stream sent by the base station is an odd number.

Preferably, when the base station sends two data streams, the carriers occupied by the pilots corresponding to the two data streams are located on adjacent carriers of the same time domain symbol.

Preferably, the physical resource block includes 18 carriers in the frequency domain, and M time-domain symbols in the time domain, where M is a natural number of one of 5-7.

Preferably, the pilot format of the physical resource block containing 5 time domain symbols is obtained by deleting the i-th symbol from the pilot structure of the physical resource block containing 6 time domain symbols, where 1<=i<=6.

Preferably, the pilot format of the physical resource block containing 7 time domain symbols is obtained by adding the i-th symbol to the pilot structure of the physical resource block containing 6 time domain symbols, where 1<=i<=6.

In order to achieve the above object, according to another aspect of the present invention, a wireless communication system is provided, including a base station and a terminal, and the base station includes a pilot transmission module for broadcasting, multicasting, and /or send pilots to the terminal in the multicast service area, wherein the pilots of the downlink subframe meet the following conditions: in each physical resource block of the downlink subframe, the number of pilots corresponding to each data stream is 6-11 One of the natural numbers.

Preferably, in the physical resource block, at least 2 time-domain symbols meet the following conditions: each data stream contains 2 pilots on each of the at least 2 time-domain symbols, and at least 2 time-domain symbols The absolute value of the difference of the indices of the symbols is greater than or equal to 2.

Preferably, the pilots corresponding to each data stream also meet the following condition: the interval between adjacent pilots corresponding to each data stream in the frequency domain does not exceed 4 subcarriers in the frequency domain.

In order to achieve the above object, according to another aspect of the present invention, a wireless communication method is provided, including: in the broadcast, multicast, and/or multicast service, the pilot frequency of the downlink subframe meets the following conditions: in the downlink subframe In each physical resource block of the frame, the number of pilots corresponding to each data stream is a natural number of one of 6-11.

Preferably, the pilots corresponding to each data stream also meet the following conditions: each data stream contains no more than two pilots on all carriers of the same time-domain symbol in each physical resource block.

Preferably, the pilots corresponding to each data stream also meet the following condition: the interval between adjacent pilots corresponding to each data stream in the frequency domain does not exceed 4 subcarriers in the frequency domain.

The present invention has the following beneficial effects: in the broadcast, multicast, and/or multicast service area of the downlink subframe, the pilot frequency of the downlink subframe meets the following conditions: in each physical resource block of the downlink subframe, each The number of pilots corresponding to the data stream is a natural number of one of 7-11. Compared with the personal traffic channel, it can increase the pilot density in the frequency domain, thereby improving the quality of channel estimation and improving the overall performance of the system. Therefore, The wireless communication system and method of the present invention can meet the needs of broadcasting services.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

FIG. 1 is a schematic structural diagram of three basic resource blocks in 16m;

FIG. 2 is a schematic diagram of a pilot format according to Embodiment 1 of the present invention;

FIG. 3 is a schematic diagram of a pilot format according to Embodiment 2 of the present invention;

FIG. 4 is a schematic diagram of a pilot format according to Embodiment 3 of the present invention;

FIG. 5 is a schematic diagram of a pilot format according to Embodiment 4 of the present invention;

FIG. 6 is a schematic diagram of a pilot format according to Embodiment 5 of the present invention;

FIG. 7 is a schematic diagram of a pilot format according to Embodiment 6 of the present invention;

FIG. 8 is a schematic diagram of a pilot format according to Embodiment 7 of the present invention;

FIG. 9 is a schematic diagram of a pilot format according to Embodiment 8 of the present invention;

FIG. 10 is a schematic diagram of a pilot format according to Embodiment 9 of the present invention;

FIG. 11 is a schematic diagram of a pilot format according to Embodiment 10 of the present invention;

FIG. 12 is a schematic diagram of a pilot format according to Embodiment 11 of the present invention;

FIG. 13 is a schematic diagram of a pilot format according to Embodiment 12 of the present invention;

FIG. 14 is a schematic diagram of a pilot format according to Embodiment 13 of the present invention;

FIG. 15 is a schematic diagram of a pilot format according to Embodiment 14 of the present invention;

FIG. 16 is a schematic diagram of a pilot format according to Embodiment 15 of the present invention;

FIG. 17 is a schematic diagram of a pilot format according to Embodiment 16 of the present invention;

FIG. 18 is a schematic diagram of a pilot format according to Embodiment 17 of the present invention;

FIG. 19 is a schematic diagram of a pilot format according to Embodiment 18 of the present invention;

FIG. 20 is a schematic diagram of a pilot format according to Embodiment 19 of the present invention;

FIG. 21 is a schematic diagram of a pilot format according to Embodiment 20 of the present invention;

FIG. 22 is a schematic diagram of a pilot format according to Embodiment 21 of the present invention;

FIG. 23 is a schematic diagram of a pilot format according to Embodiment 22 of the present invention;

FIG. 24 is a schematic diagram of a pilot format according to Embodiment 23 of the present invention;

FIG. 25 is a schematic diagram of a pilot format according to Embodiment 24 of the present invention;

FIG. 26 is a schematic diagram of a pilot format according to Embodiment 25 of the present invention;

FIG. 27 is a schematic diagram of a pilot format according to Embodiment 26 of the present invention;

FIG. 28 is a schematic diagram of a pilot format according to Embodiment 27 of the present invention;

FIG. 29 is a schematic diagram of a pilot format according to Embodiment 28 of the present invention;

FIG. 30 is a schematic diagram of a pilot format according to Embodiment 29 of the present invention;

FIG. 31 is a schematic diagram of a pilot format according to Embodiment 30 of the present invention;

FIG. 32 is a schematic diagram of a pilot format according to Embodiment 31 of the present invention;

FIG. 33 is a schematic diagram of a pilot format according to Embodiment 32 of the present invention;

FIG. 34 is a schematic diagram of a pilot format according to Embodiment 33 of the present invention;

FIG. 35 is a block diagram of a wireless communication system according to an embodiment of the present invention.

Detailed ways

The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

Referring first to FIG. 35, there is shown a block diagram of a wireless communication system according to an embodiment of the present invention. The wireless communication system includes a base station 1 and a plurality of terminals 2. The base station 1 includes a pilot sending module 11 for sending pilots to terminals in a broadcast, multicast, and/or multicast service area in a downlink subframe. Wherein, the pilots in the downlink subframe meet the following conditions: in each physical resource block of the downlink subframe, the number of pilots corresponding to each data stream is a natural number of one of 6-11. Wherein, the pilots corresponding to each data stream also meet the following condition: the interval between adjacent pilots corresponding to each data stream in the frequency domain does not exceed 4 subcarriers in the frequency domain. In a physical resource block, at least 2 time-domain symbols meet the following conditions: each data stream contains 2 pilots on each of the at least 2 time-domain symbols, and at least 2 time-domain symbols index The absolute value of the difference is greater than or equal to 2.

The embodiment of the present invention also provides a wireless communication method. In broadcast, multicast, and/or multicast services, the pilot frequency of the downlink subframe meets the following conditions: in each physical resource block of the downlink subframe, each The number of pilots corresponding to each data stream is a natural number of one of 6-11. Wherein, the pilots corresponding to each data stream also meet the following conditions: each data stream contains no more than two pilots on all carriers of the same time-domain symbol in each physical resource block. The pilots corresponding to each data stream also meet the following condition: the interval between adjacent pilots corresponding to each data stream in the frequency domain does not exceed 4 subcarriers in the frequency domain.

An embodiment of the present invention also provides a method for sending a pilot in a wireless communication system, including: the base station sends a pilot to a terminal in a broadcast, multicast, and/or multicast service area in a downlink subframe, wherein the downlink The pilots of the subframe may meet the following condition: in each physical resource block of the downlink subframe, the number of pilots corresponding to each data stream is a natural number of one of 6-11.

Preferably, the pilot corresponding to each data stream can also meet at least one of the following conditions:

Each data stream contains no more than two pilots on all carriers of the same time domain symbol in each physical resource block;

The pilots corresponding to each data stream also meet the following conditions: the interval between the adjacent pilots corresponding to each data stream in the frequency domain does not exceed 4 subcarriers, wherein the adjacent pilots in the frequency domain Frequency means that for a pilot position A, another pilot corresponding to the pilot position with the smallest interval with the pilot position A in the frequency domain, the interval in the frequency domain refers to the relative index of the frequency domain subcarrier corresponding to the pilot position the difference between

In a physical resource block, at least 2 time-domain symbols meet the following conditions: each data stream contains 2 pilots on each of the at least 2 time-domain symbols, and at least 2 time-domain symbols index The absolute value of the difference is greater than or equal to 2, wherein the difference between the indexes of the time domain symbols is the difference between the corresponding index values of the time domain symbols shown in Figure 1;

The pilot corresponding to at least one of the data streams sent by the base station meets the following conditions: the relative index of the carrier occupied in the physical resource block is an odd number, where the relative index of the carrier is the relative index of the carrier relative to the time domain symbol where the carrier is located The index of the first carrier of . Specifically, when the number of data streams sent by the base station is one, the relative index of the carrier occupied by the pilot corresponding to the data stream sent by the base station in the physical resource block is an odd number; the number of data streams sent by the base station is two In the case of , the relative index of the carrier occupied by the pilot in the physical resource block corresponding to the first data stream sent by the base station is an odd number.

In addition, when the base station sends two data streams, the carriers occupied by the pilots corresponding to the two data streams may be located on adjacent carriers of the same time-domain symbol.

The physical resource block in the above method includes 18 carriers in the frequency domain, and M time-domain symbols in the time domain, where M is a natural number of one of 5-7. The pilot pattern of a physical resource block containing 5 time domain symbols can be obtained by deleting the i-th symbol from the pilot structure of a physical resource block containing 6 time domain symbols, where 1<=i<=6. The pilot format of a physical resource block containing 7 time-domain symbols can be obtained by adding the i-th symbol to the pilot structure of a physical resource block containing 6 time-domain symbols, where 1<=i<=6, that is, The pilot structure on the i-th symbol is copied and added to the pilot structure of the physical resource block, and the copied pilot structure can be added before any symbol of the original pilot structure.

The conditions satisfied by the pilot are described in detail below through specific embodiments.

First, the structure of the resource block where the pilot is located is introduced. FIG. 1 is a schematic structural diagram of three basic resource blocks (ie, physical resource blocks) in 16m. As shown in Figure 1, Figure 1(a), Figure 1(b) and Figure 1(c) are the structures of the basic resource blocks applied in the embodiment of the present invention respectively, occupying 5, 6 and 7 symbols (ie, OFDMA symbols) each occupy 18 carriers in the frequency domain. As shown in Figure 1(a), when the downlink subframe has 5 symbols, the physical resource block structure is 18*5 (frequency domain*time domain); as shown in Figure 1(b), when the downlink subframe has 6 When there are 7 symbols, the physical resource block structure is 18*6 (frequency domain*time domain); as shown in Figure 1(c), when the downlink subframe has 7 symbols, the physical resource block structure is 18*7 (frequency domain *Time Domain).

Fig. 2 is a schematic diagram of a pilot format according to Embodiment 1 of the present invention. As shown in Figure 2, this embodiment illustrates a subframe with a structure of 18*5, the pilot format set in each resource block, the number of pilots for each data stream (or antenna) is 7, and the gray square Indicates the position of the carrier occupied by the pilot. Figure 2(a) shows the pilot structure for one data stream, and Figure 2(b) shows the pilot structure for two data streams. As shown in Figure 2(a) and Figure 2(b), the numbers 1 and 2 in the gray squares represent data stream 1 and data stream 2, respectively. In Figure 2(a), the number of pilots of data stream 1 on the same time domain symbol in the basic resource block is set to 1 or 2, and data stream 1 is adjacent to each other in the frequency domain in the basic resource block Pilots are spaced at one of 1-4 carriers in the frequency domain. In FIG. 2( b ), in the basic resource block, the pilot of data stream 2 is set on the adjacent carrier of the same time-domain symbol of data stream 1 in the basic resource block. In addition, as shown in Figure 2(a), each of the two time-domain symbols in the basic resource block (in this embodiment, time-domain symbol 1 and time-domain symbol 5) is set to 2 pilots of data stream 1, and the index difference of these two time domain symbols is 5−1=4. And, as shown in FIG. 2(a), the pilot of data stream 1 is set on the carrier whose relative index in the frequency domain of the basic resource block is an odd number. The relative index of the carrier refers to the time when the carrier is located relative to the carrier. The index of the first carrier on the domain symbol, e.g. for the 5th carrier on the time domain symbol 2, its relative index is 5.

Fig. 3 is a schematic diagram of a pilot format according to Embodiment 2 of the present invention. As shown in FIG. 3 , this embodiment illustrates a format of pilots within each resource block for a subframe containing 6 symbol structures. The number of pilots for each data stream is 7, and the gray square represents the space occupied by the pilots. carrier position. Figure 3(a) shows the pilot structure for one data stream, and Figure 3(b) shows the pilot structure for two data streams. As shown in Figure 3(a), a data stream is set on each of the two time-domain symbols in the basic resource block (in this embodiment, time-domain symbol 1 and time-domain symbol 6) 2 pilots of 1, and the index difference of these two time domain symbols is 5.

Fig. 4 is a schematic diagram of a pilot format according to Embodiment 3 of the present invention. As shown in FIG. 4 , this embodiment illustrates a format of a pilot within each resource block for a subframe containing 7 symbol structures. The number of pilots for each data stream is 8, and the gray square represents the space occupied by the pilot. carrier position. Figure 4(a) shows the pilot structure for one data stream, and Figure 4(b) shows the pilot structure for two data streams. As shown in Figure (a), 2 pilots of data stream 1 are set on each of the 2 time-domain symbols in the basic resource block, and the index difference between the two time-domain symbols is 5.

Fig. 5 is a schematic diagram of a pilot format according to Embodiment 4 of the present invention. As shown in FIG. 5 , this embodiment illustrates a format of a pilot within each resource block for a subframe containing 5 symbol structures. The number of pilots for each data stream is 8, and the gray square represents the space occupied by the pilot. carrier position. Figure 5(a) shows the pilot structure for one data stream, and Figure 5(b) shows the pilot structure for two data streams. As shown in Figure 5(a), 2 pilots of data stream 1 are set on each of the 3 time-domain symbols in the basic resource block, and the index difference of these 3 time-domain symbols is less than or equal to 4.

Fig. 6 is a schematic diagram of a pilot format according to Embodiment 5 of the present invention. As shown in FIG. 6 , this embodiment illustrates a format of pilots within each resource block for a subframe containing 6 symbol structures. The number of pilots for each data stream is 8, and the gray square represents the space occupied by the pilots. carrier position. Figure 6(a) shows the pilot structure for one data stream, and Figure 6(b) shows the pilot structure for two data streams.

Fig. 7 is a schematic diagram of a pilot format according to Embodiment 6 of the present invention. As shown in FIG. 7 , this embodiment illustrates a format of a pilot within each resource block for a subframe containing 7 symbol structures. The gray square represents the carrier position occupied by the pilot, and the number of pilots for each data stream is 9, wherein Fig. 7(a) is a pilot structure for one data stream, and Fig. 7(b) is a pilot structure for two data streams.

Fig. 8 is a schematic diagram of a pilot format according to Embodiment 7 of the present invention. As shown in FIG. 8, this embodiment illustrates a format of a pilot inserted inside each resource block for a subframe containing 5 symbol structures. The gray square represents the carrier position occupied by the pilot, and the pilot of each data stream The number of frequencies is 8, wherein Fig. 8(a) is a pilot structure for one data stream, and Fig. 8(b) is a pilot structure for two data streams.

FIG. 9 is a schematic diagram of a pilot format according to Embodiment 8 of the present invention. As shown in Figure 9, this embodiment illustrates a format of a pilot inserted inside each resource block for a subframe containing 7 symbol structures, the gray square indicates the carrier position occupied by the pilot, and the pilot of each data stream The number of frequencies is 9, wherein Fig. 9(a) is a pilot structure for one data stream, and Fig. 9(b) is a pilot structure for two data streams.

Fig. 10 is a schematic diagram of a pilot format according to Embodiment 9 of the present invention. As shown in FIG. 10, this embodiment illustrates a format of a pilot inserted inside each resource block for a subframe containing 5 symbol structures. The gray square represents the carrier position occupied by the pilot, and the pilot of each data stream The number of frequencies is 8, wherein Fig. 10(a) is a pilot structure for one data stream, and Fig. 10(b) is a pilot structure for two data streams.

Fig. 11 is a schematic diagram of a pilot format according to Embodiment 10 of the present invention. As shown in FIG. 11 , this embodiment illustrates a format of a pilot within each resource block for a subframe containing 6 symbol structures. The number of pilots for each data stream is 8, and the gray square represents the space occupied by the pilot. carrier position. Figure 11(a) shows the pilot structure for one data stream, and Figure 11(b) shows the pilot structure for two data streams.

Fig. 12 is a schematic diagram of a pilot format according to Embodiment 11 of the present invention. As shown in FIG. 12 , this embodiment illustrates a format of pilots inside each resource block for a subframe containing 7 symbol structures. The number of pilots for each data stream is 9, and the gray square represents the space occupied by the pilots. carrier position. Figure 12(a) shows the pilot structure for one data stream, and Figure 12(b) shows the pilot structure for two data streams.

Fig. 13 is a schematic diagram of a pilot format according to Embodiment 12 of the present invention. As shown in FIG. 13 , this embodiment illustrates a format of a pilot within each resource block for a subframe containing 5 symbol structures. The gray square represents the carrier position occupied by the pilot, and the number of pilots for each data stream is 8, wherein Fig. 13(a) is the pilot structure for one data stream, and Fig. 13(b) is the pilot structure for two data streams.

Fig. 14 is a schematic diagram of a pilot format according to Embodiment 13 of the present invention. As shown in FIG. 14 , this embodiment illustrates a format of a pilot within each resource block for a subframe containing 6 symbol structures. The number of pilots for each data stream is 8, and the gray square represents the space occupied by the pilot. carrier position. Figure 14(a) shows the pilot structure for one data stream, and Figure 14(b) shows the pilot structure for two data streams.

Fig. 15 is a schematic diagram of a pilot format according to Embodiment 14 of the present invention. As shown in FIG. 15 , this embodiment describes a format of pilots inside each resource block for a subframe containing 7 symbol structures. The number of pilots for each data stream is 9, and the gray square indicates the space occupied by the pilots. carrier position. Figure 15(a) shows the pilot structure for one data stream, and Figure 15(b) shows the pilot structure for two data streams.

Fig. 16 is a schematic diagram of a pilot format according to Embodiment 15 of the present invention. As shown in FIG. 16 , this embodiment illustrates a format of a pilot within each resource block for a subframe containing 5 symbol structures. The gray square represents the carrier position occupied by the pilot, and the number of pilots for each data stream is 8, wherein Figure 16(a) shows the pilot structure for one data stream, and Figure 16(b) shows the pilot structure for two data streams.

Fig. 17 is a schematic diagram of a pilot format according to Embodiment 16 of the present invention. As shown in FIG. 17 , this embodiment illustrates a format of pilots inside each resource block for a subframe containing 6 symbol structures. The number of pilots for each data stream is 9, and the gray square indicates the space occupied by the pilots. carrier position. Figure 17(a) shows the pilot structure for one data stream, and Figure 17(b) shows the pilot structure for two data streams.

Fig. 18 is a schematic diagram of a pilot format according to Embodiment 17 of the present invention. As shown in FIG. 18, this embodiment illustrates a format of pilots inside each resource block for a subframe containing 7 symbol structures. The number of pilots for each data stream is 10, and the gray square indicates the space occupied by the pilots. carrier position. Figure 18(a) shows the pilot structure for one data stream, and Figure 18(b) shows the pilot structure for two data streams.

Fig. 19 is a schematic diagram of a pilot format according to Embodiment 18 of the present invention. As shown in FIG. 19 , this embodiment illustrates a format of a pilot within each resource block for a subframe containing 5 symbol structures. The gray square represents the carrier position occupied by the pilot, and the number of pilots for each data stream is 9, wherein Fig. 19(a) is the pilot structure for one data stream, and Fig. 19(b) is the pilot structure for two data streams.

Fig. 20 is a schematic diagram of a pilot format according to Embodiment 19 of the present invention. As shown in FIG. 20 , this embodiment illustrates a format of pilots within each resource block for a subframe containing 6 symbol structures. The number of pilots for each data stream is 9, and the gray square represents the space occupied by the pilots. carrier position. Figure 20(a) shows the pilot structure for one data stream, and Figure 20(b) shows the pilot structure for two data streams.

Fig. 21 is a schematic diagram of a pilot format according to Embodiment 20 of the present invention. As shown in FIG. 21, this embodiment illustrates a format of pilots inside each resource block for a subframe containing 7 symbol structures. The number of pilots for each data stream is 10, and the gray squares represent the pilots occupied by the pilots. carrier position. Figure 21(a) shows the pilot structure for one data stream, and Figure 21(b) shows the pilot structure for two data streams.

Fig. 22 is a schematic diagram of a pilot format according to Embodiment 21 of the present invention. As shown in FIG. 22 , this embodiment describes a format of a pilot within each resource block for a subframe containing 5 symbol structures. The gray square indicates the carrier position occupied by the pilot, and the number of pilots for each data stream is 9, wherein Fig. 22(a) is the pilot structure for one data stream, and Fig. 22(b) is the pilot structure for two data streams.

Fig. 23 is a schematic diagram of a pilot format according to Embodiment 22 of the present invention. As shown in FIG. 23, this embodiment illustrates a format of pilots inside each resource block for a subframe containing 6 symbol structures. The number of pilots for each data stream is 10, and the gray square represents the space occupied by the pilots. carrier position. Figure 23(a) shows the pilot structure for one data stream, and Figure 23(b) shows the pilot structure for two data streams.

Fig. 24 is a schematic diagram of a pilot format according to Embodiment 23 of the present invention. As shown in FIG. 24, this embodiment illustrates a format of pilots inside each resource block for a subframe containing 7 symbol structures. The number of pilots for each data stream is 11, and the gray squares represent the pilots occupied by the pilots. carrier position. Figure 24(a) shows the pilot structure for one data stream, and Figure 24(b) shows the pilot structure for two data streams.

Fig. 25 is a schematic diagram of a pilot format according to Embodiment 24 of the present invention. As shown in Figure 25, this embodiment describes a format of pilots within each resource block for a subframe containing 6 symbol structures, the gray square indicates the carrier position occupied by the pilots, and the number of pilots for each data stream is 9, wherein Fig. 25(a) is the pilot structure for one data stream, and Fig. 25(b) is the pilot structure for two data streams.

Fig. 26 is a schematic diagram of a pilot format according to Embodiment 25 of the present invention. As shown in FIG. 26, this embodiment illustrates a format of pilots inside each resource block for a subframe containing 8 symbol structures. The number of pilots for each data stream is 8, and the gray square indicates the space occupied by the pilots. carrier position. Figure 26(a) shows the pilot structure for one data stream, and Figure 26(b) shows the pilot structure for two data streams.

FIG. 27 is a schematic diagram of a pilot format according to Embodiment 26 of the present invention. As shown in FIG. 26, this embodiment illustrates a format of pilots inside each resource block for a subframe containing 6 symbol structures. The number of pilots for each data stream is 9, and the gray square indicates the space occupied by the pilots. carrier position. Figure 27(a) shows the pilot structure for one data stream, and Figure 27(b) shows the pilot structure for two data streams.

Fig. 28 is a schematic diagram of a pilot format according to Embodiment 27 of the present invention. As shown in FIG. 28 , this embodiment illustrates a format of a pilot within each resource block for a subframe containing 5 symbol structures. The gray square indicates the carrier position occupied by the pilot, and the number of pilots for each data stream is 6, wherein Figure 28(a) shows the pilot structure for one data stream, and Figure 28(b) shows the pilot structure for two data streams.

Fig. 29 is a schematic diagram of a pilot format according to Embodiment 28 of the present invention. As shown in Figure 29, this embodiment describes a format of pilots inside each resource block for a subframe containing 6 symbol structures. The number of pilots for each data stream is 8, and the gray square represents the space occupied by the pilots. carrier position. Figure 29(a) shows the pilot structure for one data stream, and Figure 29(b) shows the pilot structure for two data streams.

Fig. 30 is a schematic diagram of a pilot format according to Embodiment 29 of the present invention. As shown in FIG. 30 , this embodiment describes a format of a pilot within each resource block for a subframe containing 7 symbol structures. The number of pilots for each data stream is 9, and the gray square represents the space occupied by the pilot. carrier position. Figure 30(a) shows the pilot structure for one data stream, and Figure 30(b) shows the pilot structure for two data streams.

Fig. 31 is a schematic diagram of a pilot format according to Embodiment 30 of the present invention. As shown in FIG. 31 , this embodiment describes a format of a pilot within each resource block for a subframe containing 5 symbol structures. The gray square indicates the carrier position occupied by the pilot, and the number of pilots for each data stream is 6, wherein Figure 31(a) shows the pilot structure for one data stream, and Figure 31(b) shows the pilot structure for two data streams.

Fig. 32 is a schematic diagram of a pilot format according to Embodiment 31 of the present invention. As shown in FIG. 32 , this embodiment illustrates a format of a pilot within each resource block for a subframe containing 6 symbol structures. The gray square indicates the carrier position occupied by the pilot, and the number of pilots for each data stream is 8, wherein Figure 32(a) shows the pilot structure for one data stream, and Figure 32(b) shows the pilot structure for two data streams.

Fig. 33 is a schematic diagram of a pilot format according to Embodiment 32 of the present invention. As shown in FIG. 33 , this embodiment describes a format of a pilot within each resource block for a subframe containing 7 symbol structures. The gray square indicates the carrier position occupied by the pilot, and the number of pilots for each data stream is 10, wherein Figure 33(a) shows the pilot structure for one data stream, and Figure 33(b) shows the pilot structure for two data streams.

FIG. 34 is a schematic diagram of a pilot format according to Embodiment 33 of the present invention. As shown in FIG. 34 , this embodiment describes a format of a pilot within each resource block for a subframe containing 8 symbol structures, the gray square indicates the carrier position occupied by the pilot, and the number of pilots for each data stream is 8, wherein Figure 34(a) shows the pilot structure for one data stream, and Figure 34(b) shows the pilot structure for two data streams.

In summary, the solutions provided by the embodiments of the present invention can increase the pilot density in the frequency domain, thereby improving the quality of channel estimation and thus improving the overall performance of the system. Therefore, the wireless communication system and method provided by the embodiments of the present invention can satisfy The needs of the broadcasting business.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (16)

1. A method for sending a pilot in a wireless communication system, wherein the base station sends a pilot to a terminal in a broadcast, multicast, and/or multicast service area in a downlink subframe, wherein the downlink subframe Pilots meet the following criteria: In each physical resource block of the downlink subframe, the number of pilots corresponding to each data stream is a natural number of one of 6-11. 2. The method according to claim 1, wherein the pilot frequency corresponding to each data stream also meets the following conditions: each data stream is on all carriers of the same time domain symbol of each physical resource block , the number of pilots included is not more than 2. 3. The method according to claim 1, wherein the pilots corresponding to each data stream also meet the following conditions: the adjacent pilots corresponding to each data stream in the frequency domain are in the frequency domain The interval is no more than 4 subcarriers. 4. The method according to claim 1, wherein the pilot frequency corresponding to each data stream also meets the following condition: in the physical resource block, at least 2 time domain symbols meet the following condition: each The data stream includes 2 pilots on each of the at least 2 time-domain symbols, and an absolute value of a difference between indices of the at least 2 time-domain symbols is greater than or equal to 2. 5. The method according to claim 1, wherein the pilot corresponding to at least one of the data streams sent by the base station meets the following conditions: the relative index of the carrier occupied in the physical resource block is odd number, wherein the relative index of the carrier is the index of the carrier relative to the first carrier on the time domain symbol where the carrier is located. 6. The method according to claim 5, wherein when the number of data streams sent by the base station is one, the pilot frequency corresponding to the data stream sent by the base station is in the physical The relative index of the carrier occupied in the resource block is an odd number; when the number of data streams sent by the base station is two, the corresponding pilot of the first data stream in the data streams sent by the base station is in the The relative index of the carrier occupied in the physical resource block is an odd number. 7. The method according to claim 1, wherein when the base station transmits two data streams, the carriers occupied by the pilots corresponding to the two data streams are located on adjacent carriers of the same time domain symbol. 8. The method according to claim 1, wherein the physical resource block includes 18 carriers in the frequency domain and M time-domain symbols in the time domain, where M is a natural number of one of 5-7. 9. The method according to claim 7, wherein the pilot format of the physical resource block comprising 5 time domain symbols is deleted by deleting the i-th from the pilot structure of the physical resource block comprising 6 time domain symbols Signs are obtained where 1<=i<=6. 10. The method according to claim 7, wherein the pilot format of the physical resource block comprising 7 time-domain symbols is added by adding the i-th in the pilot structure of the physical resource block comprising 6 time-domain symbols Signs are obtained where 1<=i<=6. 11. A wireless communication system, comprising a base station and a terminal, characterized in that, The base station includes a pilot sending module, configured to send a pilot to a terminal in a broadcast, multicast, and/or multicast service area in a downlink subframe, wherein the pilot of the downlink subframe meets the following conditions: In each physical resource block of the downlink subframe, the number of pilots corresponding to each data stream is a natural number of one of 6-11. 12. The system according to claim 11, wherein in the physical resource block, at least 2 time-domain symbols satisfy the following condition: each data stream in each of the at least 2 time-domain symbols The time-domain symbols include 2 pilots, and the absolute value of the difference between the indexes of the at least 2 time-domain symbols is greater than or equal to 2. 13. The system according to claim 11, wherein the pilots corresponding to each data stream also meet the following conditions: the adjacent pilots corresponding to each data stream in the frequency domain are in the frequency domain The interval is no more than 4 subcarriers. 14. A wireless communication method, characterized in that, in broadcast, multicast, and/or multicast services, the pilot frequency of the downlink subframe meets the following conditions: In each physical resource block of the downlink subframe, the number of pilots corresponding to each data stream is a natural number of one of 6-11. 15. The method according to claim 14, wherein the pilot frequency corresponding to each data stream also meets the following condition: each data stream is on all carriers of the same time domain symbol of each physical resource block , the number of pilots included is not more than 2. 16. The method according to claim 14, wherein the pilots corresponding to each data stream also meet the following conditions: the adjacent pilots corresponding to each data stream in the frequency domain are in the frequency domain The interval is no more than 4 subcarriers.

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