KR101312089B1 - Frame structure and arrangement method, communication method thereof - Google Patents

Abstract

The present invention provides a frame structure, a method of arranging the same, and a communication method, and implements a new frame structure in which a CP is 1/4 OFDM codes. Matching with the provided frame structure can be implemented to avoid uplink / downlink interference.

Description

Frame structure and arrangement method, communication method

TECHNICAL FIELD The present invention relates to the field of communications, and more particularly, to a frame structure, a layout method thereof, and a communication method.

Orthogonal Frequency Division Multiplexing (OFDM) is a high-speed transmission technique in a wireless environment, which improves the performance of preventing multipath fading by extending the pulse width of a code. An implementation principle of the OFDM technique is to convert high-speed serial data into relatively low-speed parallel data of a multipath, and modulate the multipath parallel data into subcarriers orthogonal to each other.

Orthogonal Frequency Division Multiple Access (OFDMA) technology is based on OFDM technology to allow users to occupy different subcarriers to implement multiple access. In a wireless communication system based on OFDMA technology, duplexing schemes supported by a base station include frequency division duplexing (FDD) and time division duplexing (TDD), respectively. Corresponds to the frame structure and the TDD frame structure. Worldwide Interoperability for Microwave Access (WiMAX) systems support TDD duplexing and FDD duplexing.

The design of the FDD frame structure mainly has the following advantages.

1. The design of the control channel is simple and the demand for uplink synchronization is low.

2. With independent uplink / downlink frequency bands, resource scheduling is relatively simple.

3. It is not restricted by coexistence system.

However, the FDD system requires the uplink / downlink to use different bandwidths, and uses the frequency spectrum in pairs, and it is inconvenient to adjust the load proportionality of the uplink / downlink. Compared to the FDD system, the design of the TDD frame structure has the following features.

1) The frequency spectrum layout is simple without requiring frequency spectra in pairs.

2) Actively allocate uplink / downlink resources and are suitable for asymmetric tasks.

3) The design of the control channel is relatively complex.

In the frame structure of the TDD system, each frame includes an uplink subframe and a downlink subframe, and a protection time is required when switching between the uplink subframe and the downlink subframe. The uplink / downlink switching interval is called a transmit / receive transition gap (TTG), also called a downlink / uplink switching point, and the downlink / uplink switching interval is a receive / transmit switching interval. (RTG, Receive / Transmit Transition Gap), and also called uplink / downlink transition point.

When the TDD frame structure of different TDD systems coexists, different TDD systems must basically match the same type of switching points. Specifically, when distributing different TDD systems at the same time, i.e., when the cover ranges overlap and are the same or adjacent frequencies, there is a problem of time coincidence between the two switching points. If the switch points do not match, there is severe co-frequency interference between the systems. For example, the Time Division-Synchronized Code Division Multiple Access (TD-SCDMA) system and the Institute of Electrical and Electronics Engineers (IEEE) 802.16m of the third generation mobile communication standard. In a system, when all are TTD duplexing, in order to place the networks in overlap, the same type of switching points must basically match.

In addition, in order to support different channel conditions, different radius cells, and different service transmissions, the same communication system must support a frame structure of various lengths of a cyclic prefix (CP). Even in the same system using TDD duplexing, there is a problem of matching the frame structure of different CPs. For example, the CP of the standard frame structure of the IEEE 802.16m system is 1/8 OFDM codes, but the CP is 1/16 in order to continuously improve the frequency efficiency under a situation in which the time delay is relatively small and the cell radius is relatively small. A frame structure of four OFDM codes is also supported, as shown in FIGS. 1 and 2. In the network layout process, if the CP of the frame structure of the cell A is 1/8 OFDM code, and the CP of the frame structure of the adjacent cell B is 1/16 OFDM code, the CP is 1/8 OFDM code and The switching points of the frame structure where the CP is 1/16 OFDM codes should basically coincide. As shown in Figs. 1 and 2, in the IEEE 802.16m system, one OFDM code has a length of 102.857us when 5 MHz, and a proportional ratio of downlink subframe and uplink subframe is 5: 3. TTG having 1/8 OFDM is 2.983 to 3.086 ms, and TTG having CP of 1/16 OFDM is 3.011 to 3.109 ms, so the downlink does not cause interference on the uplink.

A communication system for supporting a situation such as an enhanced multicast broadcast service (EMBS) and a large radius cell, in addition to a frame structure in which a CP is 1/8 OFDM code and a CP is 1/16 OFDM code. Also supports a frame structure in which the CP is 1/4 OFDM code. For example, Fig. 3 shows a frame structure of an OFDM code having a quarter of CP. However, the design of Fig. 3 cannot satisfy the TTG matching problem when frame structures having different CPs coexist, and the uplink / downlink interfere with each other. Therefore, a frame structure with a new CP of 1/4 OFDM codes is needed.

The present invention is proposed in consideration of the fact that a frame structure having a current CP of 1/4 OFDM codes cannot solve a matching problem with a frame structure having other CPs. Therefore, an object of the present invention is to solve the above problem by providing a frame structure in which a new CP is 1/4 OFDM code and its arrangement method.

According to an aspect of the present invention, a frame structure arrangement method is provided, wherein a cyclic prefix of a frame structure is 1/4 OFDM codes.

In the method, in determining seven sub-frames for arranging the frame structure, the quantity of each of the first type of subframe, the second type of subframe, and the third type of subframe is A, B, C; Among them, the sum of A, B, and C is 7, the first type subframe includes 6 OFDM codes, the second type subframe includes 7 OFDM codes, and the third type subframe. Includes five OFDM codes.

Preferably, the frame structure is a TDD frame structure, and one of the following sets is selected to be {A, B, C}: {5, 1, 1}, {3, 2, 2}. Alternatively, the frame structure is an FDD frame structure, and one of the following sets is selected to be {A, B, C}: {4, 2, 1}, {2, 3, 2}.

Advantageously, the method further comprises: disposing a first downlink subframe of the frame structure into a subframe of a first type; And / or arrange the first uplink subframe of the frame structure into a first type subframe or a second type subframe.

According to another aspect of the present invention, a frame structure arrangement method is provided, wherein a cyclic prefix of a frame structure is 1/4 OFDM codes.

In the method, in determining six subframes for arranging the frame structure, the quantity of each of the first type of subframe, the second type of subframe, and the third type of subframe is A, B, C; Among them, the sum of A, B, and C is 6, 6 OFDM codes are included in the first type subframe, 7 OFDM codes are included in the second type subframe, and 3rd type subframe. 8 OFDM codes are included.

Preferably, the frame structure is a TDD frame structure, and one of the following sets is selected to be {A, B, C}: {1, 4, 1}, {0, 6, 0}. Alternatively, the frame structure is an FDD frame structure, and one of the following sets is selected to be {A, B, C}: {1, 3, 2}, {0, 5, 1}.

Advantageously, the method further comprises: disposing a first downlink subframe of the frame structure into a subframe of a first type; And / or arrange the first uplink subframe of the frame structure into a first type subframe or a second type subframe.

According to another aspect of the present invention, an arrangement method used for a multiple frame structure is provided, and the arrangement is performed when a plurality of frame structures having different cyclic prefixes coexist.

In this method, the RTG of the first frame structure is adjusted and / or the code in the uplink subframe or the downlink subframe in the first frame structure is deleted so that the start position of the uplink subframe in the first frame structure is Located behind an end position of a downlink subframe of the second frame structure; Among them, one of the first frame structure and the second frame structure is composed of seven or six subframes, and its cyclic prefix is 1/4 OFDM code.

Preferably, the RTG of the first frame structure is adjusted through the following operation, i.e., the offset or start position of the uplink subframe in the broadcast channel is transmitted; And / or transmit the offset or start position of the RTG and / or TTG in the broadcast channel.

Preferably, the first frame structure and the second frame structure are TDD frame structures, and the seven subframes include: a first type subframe including six OFDM codes; A second type of subframe including seven OFDM codes; A third type of subframe including five OFDM codes; and a quantity of each of the first type of subframe, the second type of subframe, and the third type of subframe is A, B, C, and One of the following sets is selected to be {A, B, C}: {5, 1, 1}, {3, 2, 2}.

delete

Preferably, the first frame structure and the second frame structure are TDD frame structures, and the six subframes include: a first type subframe including six OFDM codes; A second type of subframe including seven OFDM codes; A third type of subframe including eight OFDM codes; the number of each of the first type of subframe, the second type of subframe, and the third type of subframe is A, B, C, and One of the following sets is selected to be {A, B, C}: {1, 4, 1}, {0, 6, 0}.

delete

According to another aspect of the present invention, a communication method is provided and is based on a frame structure having a cyclic prefix of 1/4 OFDM codes.

In the method, the first equipment transmits a radio frame to the second equipment, wherein the radio frame is composed of seven subframes, the first type of subframe and the second type of subframes included in the subframe. The number of frames, the third type of subframe, is A, B, and C, respectively, and the sum of A, B, and C is 7, among which six OFDM codes are included in the first type of subframe. Seven OFDM codes are included in the two types of subframes, and five OFDM codes are included in the third type subframe.

Preferably, the frame structure is a TDD frame structure and {A, B, C} is selected from the following set {5, 1, 1}, {3, 2, 2}. Alternatively, the frame structure is an FDD frame structure, and {A, B, C} is selected from the following set {4, 2, 1}, {2, 3, 2}.

Preferably, one of the first facility and the second facility is a base station or relay station, and the other is a terminal or relay station.

According to another aspect of the present invention, a communication method is provided and is based on a frame structure having a cyclic prefix of 1/4 OFDM codes.

Among the methods, the first equipment transmits a radio frame to the second equipment, wherein the radio frame is arranged in six subframes, and includes a first type of subframe and a second type of subframe. The number of frames, the third type of subframe, is A, B, and C, respectively, and the sum of A, B, and C is 6, among which six OFDM codes are included in the first type of subframe. Seven OFDM codes are included in the two types of subframes, and eight OFDM codes are included in the third type subframe.

Preferably, the frame structure is a TDD frame structure and {A, B, C} is selected from the following set {1, 4, 1}, {0, 6, 0}. Alternatively, the frame structure is an FDD frame structure, and {A, B, C} is selected from the following sets {1, 3, 2}, {0, 5, 1}.

Preferably, one of the first facility and the second facility is a base station or relay station, and the other is a terminal or relay station.

According to another aspect of the present invention, there is provided a frame structure, whose cyclic prefix is 1/4 OFDM code, and the seven subframes constituting the frame structure include a first type of subframe and a second type of subframe. Frame, the third type of subframe, the first type of subframe includes 6 OFDM codes, the second type of subframe includes 7 OFDM codes, the third type of subframe includes 5 OFDM codes are included.

Preferably, the quantities A, B, and C of the first type of subframe, the second type of subframe, and the third type of subframe have a sum of A, B, and C and are equal to {A, B, C. } Is selected from the following set {5, 1, 1}, {3, 2, 2}, {4, 2, 1}, {2, 3, 2}.

According to another aspect of the present invention, there is provided a frame structure, whose cyclic prefix is 1/4 OFDM code, and the six subframes constituting the frame structure include a first type of subframe and a second type of subframe. Frame, the third type of subframe, the first type of subframe includes six OFDM codes, the second type of subframe includes seven OFDM codes, the third type of subframe includes 8 OFDM codes are included.

Preferably, the quantities A, B, and C of the first type of subframe, the second type of subframe, and the third type of subframe have a sum of A, B, and C equal to 6 and {A, B, C } Satisfies a condition selected from the following set {1, 4, 1}, {0, 6, 0}, {1, 3, 2}, {0, 5, 1}.

Through at least one technical scheme provided in the present invention, a new frame structure in which the CP is 1/4 OFDM code is implemented. Compared to the conventional technology, the frame structure includes a frame structure having other different CPs. By implementing the matching of, it is possible to avoid the uplink / downlink interference.

Other features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objects and other advantages of the present invention will be realized and obtained through structures particularly set forth in the specification, claims, and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention, It is not. In the drawings:
1 is a frame structure diagram of a wireless communication system according to the related art, wherein CP is 1/8 OFDM code;
2 is a frame structure diagram of a wireless communication system according to the related art, wherein CP is 1/16 OFDM codes;
3 is a frame structure diagram of a wireless communication system according to the related art, wherein CP is 1/4 OFDM code;
4 and 5 are frame structure diagrams of a wireless communication system according to an embodiment of the present invention, wherein CP is 1/4 OFDM codes, and the frame structure includes 7 subframes;
6 and 7 are frame structure diagrams of a wireless communication system according to an embodiment of the present invention, wherein CP is 1/4 OFDM codes, and the frame structure includes six subframes;
8 to 10 show that each CP according to an embodiment of the present invention has a 1/4 OFDM code (also called a 1/4 CP), a CP having 1/8 OFDM code (also called a 1/8 CP), or a CP. Frame structure uplink / downlink matching diagram of 1/16 OFDM codes (also called 1/16 CP).

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. If the present invention does not conflict with each other, the features of the embodiments and embodiments of the present invention may be combined with each other.

The frame structure divides radio resources into units of different classes in the time domain. For example, it is divided into a super frame, a frame, a subframe, an OFDMA symbol, or an OFDM code to provide active control and management. It satisfies the requirements of Quality of Service, in particular the system transmission time delay. For example, in a frame structure in which CPs are 1/8 OFDM codes as shown in FIG. 1, radio resources are divided into 20 ms superframes in the time domain, and four 5 ms frames are included in each superframe. Each frame includes eight subframes, and the subframes are arranged with basic OFDM codes. When the downlink and uplink proportions of TDD are 5: 3, the number of codes in the eight subframes is respectively 6, 6, 6, 6, 5, 6, 6, 6. In a frame structure in which CPs are 1/16 OFDM codes as shown in FIG. 2, radio resources are divided into 20 ms superframes in the time domain, and each superframe includes four 5 ms frames. The frame includes eight subframes, and the subframes are arranged with basic OFDM codes. When the downlink and uplink proportions of TDD are 5: 3, the number of codes in the eight subframes is 6, 7, respectively. 6, 6, 6, 6, 6, 7.

In the frame structure provided in the embodiment of the present invention, the system bandwidth of the frame structure may be 5 MHz, 10 MHz, or 20 MHz, and radio resources are divided into 20 ms super frames in the time domain, and 4 5 ms in each super frame. A frame is included, and each frame includes seven or six subframes, the subframes are arranged in basic OFDM codes, and the CP is 1/4 OFDM codes. 4 to 7 are frame structures in which CPs are 1/4 OFDM codes, respectively, according to an embodiment of the present invention. Among them, in the frame structure shown in FIGS. Subframes are included, and in the frame structure shown in Figs. 6 and 7, each frame includes six subframes. In the following, each description will proceed.

≪ Example 1 >

The frame structure arranged in seven sub-frames can be arranged through the following method, i.e., in the seven sub-frames constituting the frame structure, a first type of sub frame, a second type of sub frame, and a third type Determine the quantity of each subframe of A, B, and C; Among them, A + B + C = 7, six OFDM codes are included in the first type subframe, seven OFDM codes are included in the second type subframe, and five are included in the third type subframe. OFDM codes are included. For example, in the TDD frame structure, {A, B, C} may be selected from {5, 1, 1}, {3, 2, 2}; In the FDD frame structure, {A, B, C} may be selected from {4, 2, 1}, {2, 3, 2}.

As {A, B, C} floats, the frame structure including seven sub-frames acquired through placement also varies. 4 and 5 show examples of two frame structures obtained through arrangement.

Example  One

In the frame structure as shown in Fig. 4, each frame in the TDD frame structure includes five first type subframes, one second type subframe, and one third type subframe; Each frame in the FDD frame structure includes four first type subframes, two second type subframes, and one third type subframe. Specifically, as shown in FIG. 4, in the TDD frame structure, when the ratio of the downlink and the uplink is 5: 2, {A, B, C} is {5, 1, 1}. That is, the number of codes in the seven subframes is 6, 7, 6, 6, 6, 6, and 5, respectively; In the FDD frame structure, {A, B, C} is {4, 2, 1}, i.e., the number of codes in seven subframes is 6, 7, 6, 6, 7, 6, and 5, respectively.

Example  2

In the frame structure shown in Fig. 5, each frame of the TDD frame structure includes three first type subframes, two second type subframes, and two third type subframes. ; Each frame in the FDD frame structure includes two first type subframes, three second type subframes, and two third type subframes. Specifically, as shown in FIG. 5, in the TDD frame structure, when the ratio of the downlink and the uplink is 4: 3, {A, B, C} is {3, 2, 2}. That is, the number of codes in the seven subframes is 6, 5, 5, 6, 6, 7, 7, respectively; In the FDD frame structure, {A, B, C} is {2, 3, 2}, that is, the number of codes in the seven subframes is 6, 5, 6, 7, 6, 7, and 7, respectively.

≪ Example 2 >

The frame structure consisting of six subframes can be arranged by the following method, i.e., in the six subframes constituting the frame structure, a first type of subframe, a second type of subframe, and a third type of Determine the quantity of each subframe as A, B, C; Among them, A + B + C = 6, six OFDM codes are included in the first type subframe, seven OFDM codes are included in the second type subframe, and eight are included in the third type subframe. OFDM codes are included. For example, in the TDD frame structure, {A, B, C} may be selected from {1, 4, 1}, {0, 6, 0}; In the FDD frame structure, {A, B, C} may be selected from {1, 3, 2}, {0, 5, 1}.

As {A, B, C} floats, the frame structure including six subframes acquired through placement also varies. 6 and 7 show examples of two frame structures obtained through arrangement.

Example  One

In the frame structure shown in Fig. 6, each frame in the TDD frame structure includes one first type of subframe, four second types of subframes, and one third type of subframes. ; Each frame in the FDD frame structure includes one first type of subframe, three second types of subframes, and two third types of subframes. Specifically, as shown in FIG. 6, in the TDD frame structure, when the ratio of the downlink and the uplink is 4: 2, {A, B, C} is {1, 4, 1}. That is, the number of codes in the six subframes is 6, 7, 7, 7, and 8, respectively; In the FDD frame structure, {A, B, C} is {1, 3, 2}, that is, the number of codes in the seven subframes is 6, 7, 7, 8, 7, 8, respectively.

Example  2

In the frame structure as shown in FIG. 7, each frame in the TDD frame structure includes zero first type subframes, six second type subframes, and zero third type subframes. ; Each frame in the FDD frame structure includes zero first type subframes, five second type subframes, and one third type subframe. Specifically, as shown in FIG. 7, in the TDD frame structure, when the ratio of the downlink and the uplink is 4: 2, {A, B, C} is {0, 6, 0}. That is, the number of symbols in the six subframes is 7, 7, 7, 7, 7, 7, respectively; In the FDD frame structure, {A, B, C} is {0, 5, 1}, i.e., the number of codes in the six subframes is 7, 7, 7, 8, 7, and 7, respectively.

In the arrangement of the frame structure, besides determining the quantity of each type of subframe, preferably, the position of each type of subframe should also be determined. In the frame structure arrangement method according to an embodiment of the present invention, preferably, the first subframe of the downlink is arranged as a subframe of the first type, and the first subframe of the uplink is arranged of the first type. Subframes or subframes of the second type are arranged, and further preferably, the last one subframe of the frame structure is arranged into a subframe of the third type.

For example, in the frame structure as shown in Fig. 4, the first subframes of the uplink and the downlink are both subframes of the first type, and in the frame structure as shown in Fig. 5, The first subframe of the link is a subframe of the first type, and the first subframe of the downlink is a subframe of the second type. This arrangement ensures that the subframe type of the subframe in which the super frame head is located is the same, makes it easy for the terminal to inspect the super frame head, and the subframe type of the first subframe of the uplink is the same. The design and inspection of the uplink control channel is advantageous. The subframe positional design described above is merely exemplary, and the frame structure may be optimized by reasonably adjusting the position of each subframe according to the demand of the implementation.

≪ Example 3 >

Based on the frame structure provided by an embodiment of the present invention, an embodiment of the present invention further provides a communication method, in which the first facility transmits a radio frame to the second facility, wherein The radio frame of may have any frame structure according to an embodiment of the present invention. Here, one of the first and second facilities may be a base station or a relay station, and the other may be, for example, a mobile terminal such as a mobile phone or a personal digital assistant (PDA). The uplink subframe in the frame structure is used for uplink transmission from the mobile terminal to the base station or relay station, and the downlink subframe in the frame structure is used for downlink transmission from the base station or relay station to the mobile terminal.

<Example 4>

The above provides an embodiment of a frame structure arrangement method and a frame structure arranged therefrom and a communication method based on the frame structure according to an embodiment of the present invention. As described above, there is a problem of coincidence of switching points or switching intervals between different TDD systems or between frame structures having different CPs of the same TDD system. Compared to the prior art, the various frame structures provided in the embodiments of the present invention can implement the matching of the switching points or the switching intervals. Hereinafter, description will be made with reference to FIGS. 8 to 10. In the frame structure matching diagram shown in FIGS. 8 to 10, at least one of frame structures to be matched is provided in the embodiment of the present invention. CP is a frame structure of 1/4 OFDM code.

The coincidence of the turning point or the switching interval according to the embodiment of the present invention means a basic coincidence, not a strict coincidence. Strict coincidence means that the end positions of the transition intervals are the same, and the basic coincidence does not have to be the end positions of the transition intervals, and only between frames having different cyclic prefixes, Any end position must not exceed the start position of the uplink subframe of other frames, or by adjusting the TTG and / or RTG of the frame structure, or by breaking or deleting the sign. All of the end positions of the downlink subframes of the frame do not exceed the start positions of the uplink subframes of other frames, thereby avoiding the same frequency interference.

Example  One

8 is an uplink / downlink matching figure 2 of 1/4 CP, 1/8 CP, and 1/16 CP frame structure. As can be seen from this, in the 1/4 CP frame structure, the time slot Ts is 114.286, downlink / uplink proportional DL: UL = 3: 4, and the number of codes in the three downlink subframes is respectively. When the number of codes in the four uplink subframes is 6, 6, 7, and 7, respectively, the downlink ends at 1.829 ms; In the 1/8 CP frame structure, the time slot Ts is 102.857, downlink / uplink proportional DL: UL = 3: 5, and the number of codes in the three downlink subframes is 6, 6, and 5, respectively. When the number of codes in the five link subframes is 6, 6, 6, 6, and 6, respectively, the downlink ends at 1.749 ms; In the 1/16 CP frame structure, the time slot Ts is 97.143, downlink / uplink proportional DL: UL = 3: 5, and the number of codes in the three downlink subframes is 6, 7, 6, and When the number of codes in the five link frames is 6, 6, 6, 6, and 7, respectively, the downlink ends at 1.846 ms. When the TTG occupies one OFDM code, it naturally satisfies three CP length frame structure matches.

Example 2

9 is an uplink / downlink matching figure 1 of 1/4 CP, 1/8 CP and 1/16 CP frame structure. As can be seen from this, in the 1/4 CP frame structure, the time slot Ts is 114.286, downlink / uplink proportional DL: UL = 4: 3, and the number of codes in the four downlink subframes is respectively. When 6, 5, 5, 6, and the number of codes in the uplink three subframes is 6, 7, 7, respectively, the downlink ends at 2.514 ms; In the 1/8 CP frame structure, the time slot Ts is 102.857, downlink / uplink proportional DL: UL = 4: 4, and the number of codes in four downlink subframes is 6, 6, 6, and 5, respectively. When the number of codes in the four uplink subframes is 6, 6, 6, and 6, respectively, the downlink ends at 2.366 ms; In the 1/16 CP frame structure, the time slot Ts is 97.143, downlink / uplink proportional DL: UL = 4: 4, and the number of codes in four downlink subframes is 6, 7, 6, and 6, respectively. When the number of codes in the four uplink subframes is 6, 6, 6 and 7, respectively, the downlink ends at 2.428 ms. As can be seen from this, the start position of the uplink subframe of the 1/8 CP frame structure is earlier than the end position of the downlink subframe of the 1/4 CP frame structure, i.e., there is an overlap of uplink / downlink. do. At this time, adjust the frame structure. For example, when the TTG occupies one OFDM code, if the RTG in the 1/8 CP frame structure is partially reduced and the reduced portion is increased in the TTG, the coincidence of the three CP length frame structures is satisfied.

Example  3

10 is an uplink / downlink matching figure 3 of 1/4 CP, 1 / 8CP, and 1/16 CP frame structure. As can be seen from this, in the 1/4 CP frame structure, the time slot Ts is 114.286, downlink / uplink proportional DL: UL = 5: 2, and the number of codes in the five downlink subframes is respectively. When 6, 5, 5, 6, 6, and the number of codes in the uplink two subframes is 7, 7, respectively, the downlink ends at 3.200 ms; In the 1/8 CP frame structure, the time slot Ts is 102.857, downlink / uplink proportional DL: UL = 5: 3, and the number of codes in the five downlink subframes is 6, 6, 6, 6, 5 and the downlink ends at 3.086 ms when the number of codes in the three uplink subframes is 6, 6 and 6, respectively; In the 1/16 CP frame structure, the time slot Ts is 97.143, downlink / uplink proportional DL: UL = 5: 3, and the number of codes in the five downlink subframes is 6, 7, 6, 6, When the number of codes in the three uplink subframes is 6, 6, and 7, respectively, the downlink ends at 3.109 ms. As can be seen from this, the start position of the uplink subframe of the 1/8 CP frame structure is earlier than the end position of the downlink subframe of the 1/4 CP frame structure, i.e., there is an overlap of uplink / downlink. do. At this time, adjust the frame structure. When the TTG occupies one OFDM code and the last one downlink code is cut off or punctuated, the switching points of the three CP length frame structures satisfy a matching relationship.

When the frame structure is adjusted to satisfy the matching relationship, the RTG for adjusting the frame structure may be used alone to remove one or a plurality of OFDM codes among uplink subframes and downlink subframes in the frame structure. It may be used in combination. Specifically, the adjustment of the RTG or OFDM code may be implemented by transmitting an offset or start position of an uplink subframe in a broadcast channel, and / or by transmitting an offset or start position of an RTG and / or TTG in a broadcast channel. have. The offset here refers to the offset to the raw frame structure before the adjustment is made.

As described above, by using the frame structure and the frame structure matching method provided by the present invention, it is possible to solve the problem of uplink / downlink subframe matching among frame structures having different CP lengths.

Although the present invention has been illustrated and described with respect to specific preferred embodiments, the present invention is not limited only to the above-described embodiments, and those skilled in the art to which the present invention pertains may variously change the present invention. It could be done. Modifications, substitutions, improvements, etc., which have been made without departing from the spirit of the technical idea of the present invention, all fall within the protection scope of the present invention.

Claims (26)

In the arrangement method of the frame structure, the cyclic prefix of the frame structure is 1/4 OFDM codes.
Of the seven subframes constituting the frame structure, the quantity of each of the first type of subframe, the second type of subframe, and the third type of subframe is determined to be A, B, C;
Among them, the sum of A, B, and C is 7, and 6 OFDM codes are included in the first type subframe, 7 OFDM codes are included in the second type subframe, and the third type. 5 OFDM codes are included in the subframe of
And having a cyclic prefix of the frame structure having a 1/4 OFDM code and a coherent transition point of the frame structure having other cyclic prefixes basically coincide. The method according to claim 1,
And the frame structure is a TDD frame structure and selects one of a set {5, 1, 1}, {3, 2, 2} to be {A, B, C}. The method according to claim 1,
And the frame structure is an FDD frame structure and selects one of a set {4, 2, 1}, {2, 3, 2} to be {A, B, C}. The method according to claim 2 or 3,
In the above method,
Disposing a first downlink subframe of the frame structure into the first type of subframe; And / or
Disposing a first uplink subframe of the frame structure into the first type subframe or the second type subframe. In the arrangement method of the frame structure, the cyclic prefix of the frame structure is 1/4 OFDM codes.
Determining the quantity A, B, C of each of the first type of subframe, the second type of subframe, and the third type of subframe among the six subframes constituting the frame structure;
Among them, the sum of A, B, and C is 6, 6 OFDM codes are included in the first type subframe, 7 OFDM codes are included in the second type subframe, and the third type is Eight OFDM codes are included in the subframe of
And having a cyclic prefix of the frame structure having a 1/4 OFDM code and a coherent transition point of the frame structure having other cyclic prefixes basically coincide. The method of claim 5,
And the frame structure is a TDD frame structure and selects one of a set {1, 4, 1}, {0, 6, 0} to be {A, B, C}. The method of claim 5,
And the frame structure is an FDD frame structure, wherein one of a set {1, 3, 2}, {0, 5, 1} is selected to be {A, B, C}. 8. The method according to claim 6 or 7,
In the above method,
Disposing a first downlink subframe of the frame structure into the first type of subframe; And / or
Disposing a first uplink subframe of the frame structure into the first type subframe or the second type subframe. In the arrangement method used for the multiple frame structure, when the multiple frame structures of different cyclic prefixes coexist, the arrangement is performed.
Adjusting the RTG of the first frame structure, and / or deleting a sign in an uplink subframe or a downlink subframe in the first frame structure, such that the start position of the uplink subframe in the first frame structure is Located after an end position of a downlink subframe of the structure;
Among them, one of the first frame structure and the second frame structure includes 7 or 6 subframes, and the cyclic prefix is 1/4 OFDM code. Placement method used. 10. The method of claim 9,
Adjusting the RTG of the first frame structure through the following operation, i.e., transmitting the offset or start position of the uplink subframe in a broadcast channel; And / or transmitting the offset or starting position of the RTG and / or TTG in the broadcast channel. 10. The method of claim 9,
The first frame structure and the second frame structure are TDD frame structures, and the seven subframes include: a first type subframe including six OFDM codes; A second type of subframe including seven OFDM codes; A third type subframe including five OFDM codes is included, and the quantity of each of the first type subframe, the second type subframe, and the third type subframe is A, B, C, and An arrangement method used for a multiple frame structure, wherein one of a set {5, 1, 1}, {3, 2, 2} is selected to be {A, B, C}. 10. The method of claim 9,
The first frame structure and the second frame structure are TDD frame structures, wherein the six subframes include: a first type subframe including six OFDM codes; A second type of subframe including seven OFDM codes; A third type subframe including eight OFDM codes, the quantity of each of the first type subframe, the second type subframe, and the third type subframe is A, B, C, and A placement method used for a multiple frame structure, wherein one of a set {1, 4, 1}, {0, 6, 0} is selected to be {A, B, C}. In the communication method, a cyclic prefix is based on a frame structure of 1/4 OFDM code, and the first equipment transmits a radio frame to the second equipment, wherein the radio frame includes 7 subframes. The quantity of the subframe of the first type, the subframe of the second type, and the subframe of the third type included in the subframe may be A, B, and C, and the sum of the three of A, B, and C may be 7, wherein six OFDM codes are included in the first type subframe, seven OFDM codes are included in the second type subframe, and five OFDM codes are included in the third type subframe. Contains,
And a coherent transition point of a frame structure having a cyclic prefix of 1/4 OFDM code and a frame structure having other cyclic prefix is basically matched. The method of claim 13,
And the frame structure is a TDD frame structure and {A, B, C} is selected from the following set {5, 1, 1}, {3, 2, 2}. The method of claim 13,
And the frame structure is an FDD frame structure and {A, B, C} is selected from the following set {4, 2, 1}, {2, 3, 2}. The method according to any one of claims 13 to 15,
One of the first facility and the second facility is a base station or a relay station, and the other is a terminal or a relay station. In the communication method, the cyclic prefix is based on a frame structure of 1/4 OFDM code, and the first equipment transmits a radio frame to the second equipment, wherein the radio frame includes 6 subframes. The quantity of the subframe of the first type, the subframe of the second type, and the subframe of the third type included in the subframe is A, B, and C, respectively, and the sum of the A, B, and C thirds is 6 Among them, six OFDM codes are included in the first type subframe, seven OFDM codes are included in the second type subframe, and eight OFDM codes are included in the third type subframe. Included,
And a coherent transition point of a frame structure having a cyclic prefix of 1/4 OFDM code and a frame structure having other cyclic prefix is basically matched. 18. The communication method according to claim 17, wherein the frame structure is a TDD frame structure, and {A, B, C} is selected from the following sets {1, 4, 1}, {0, 6, 0}. 18. The method of claim 17,
And the frame structure is an FDD frame structure and {A, B, C} is selected from the following set {1, 3, 2}, {0, 5, 1}. The method according to any one of claims 17 to 19,
One of the first facility and the second facility is a base station or a relay station, and the other is a terminal or a relay station. In the frame structure, its cyclic prefix is 1/4 OFDM code, and the seven subframes constituting the frame structure include a first type subframe, a second type subframe, and a third type subframe. 6 OFDM codes are included in the first type subframe, 7 OFDM codes are included in the second type subframe, and 5 OFDM codes are included in the third type subframe.
A frame structure in which the coherent transition points of a frame structure with a cyclic prefix of 1/4 OFDM code and a frame structure with other cyclic prefix are basically matched. The method of claim 21,
The sum of quantities A, B, and C of the first type of subframe, the second type of subframe, and the third type of subframe is 7, and {A, B, C} is the following set {5, 1, 1}, {3, 2, 2}, {4, 2, 1}, {2, 3, 2}. In the frame structure, its cyclic prefix is 1/4 OFDM code, and the six subframes constituting the frame structure include a first type subframe, a second type subframe, and a third type subframe. Wherein, the first type subframe includes six OFDM codes, the second type subframe includes seven OFDM codes, and the third type subframe includes eight OFDM codes. Included,
A frame structure in which the coherent transition points of a frame structure with a cyclic prefix of 1/4 OFDM code and a frame structure with other cyclic prefix are basically matched. 24. The method of claim 23,
The sum of quantities A, B, and C of the first type of subframe, the second type of subframe, and the third type of subframe is 6, and {A, B, C} is the following set {1, 4, 1}, {0, 6, 0}, {1, 3, 2}, {0, 5, 1}.
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