CN106488540B

CN106488540B - A kind of communication means, device and the system of the M2M system based on TDD

Info

Publication number: CN106488540B
Application number: CN201510557512.2A
Authority: CN
Inventors: 杨浔; 姜艳平; 余西西
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2015-09-01
Filing date: 2015-09-01
Publication date: 2019-11-29
Anticipated expiration: 2035-09-01
Also published as: CN106488540A; WO2017036236A1; WO2017036236A9

Abstract

Communication means, user equipment, base station and the communication system for the M2M system based on TDD that the invention discloses a kind of.The communication means includes: primary synchronization signal PSS, secondary synchronization signal SSS and the frame number FID for receiving base station and sending；First time interval and the second time interval are obtained, which is to be properly received the PSS to the time interval for being properly received the SSS, which is to be properly received the SSS to the time interval for being properly received the FID；The ratio of uplink subframe to downlink subframe of the system is determined according to the first time interval and second time interval.Communication means, user equipment, base station and the communication system of the M2M system based on TDD of the embodiment of the present invention, first time interval and the second time interval can be passed through, the ratio of uplink subframe to downlink subframe of the system is determined in advance, and then takes corresponding dormancy strategy to reduce power consumption.

Description

TDD-based communication method, device and system of M2M system

Technical Field

The present invention relates to the field of communications, and in particular, to a communication method, a user equipment, a base station, and a communication system for a TDD-based M2M system.

Background

The provision of Machine To Machine (M2M) communication services using cellular networks is a hot spot of current M2M research. The M2M network is co-sited with the existing cellular network, and the co-frequency band becomes a basic requirement for reducing the operation and maintenance cost of operators. In order To fully utilize the limited cellular network spectrum, the third generation partnership Project (3 GPP) considers To utilize the guard band of the Global System for mobile communications (GSM) or Long Term Evolution (LTE) System To implement the application of the Machine To Machine (Machine To Machine, M2M) System, the Frequency Division Duplex (FDD) based M2M System is more fully developed, the Time Division Duplex (Time Division TDD Duplex, FDD) based M2M System is not fully developed, and how To provide the M2M application by using the TDD spectrum resources is an urgent issue To be considered.

Disclosure of Invention

Embodiments of the present invention provide a communication method, a user equipment, a base station, and a communication system for a TDD-based M2M system, which can implement M2M application by using TDD spectrum resources, and the user equipment can determine an uplink and downlink subframe ratio of the system in advance, and adopt a corresponding sleep policy to reduce power consumption according to the uplink and downlink subframe ratio of the system.

In a first aspect, a communication method for a TDD-based M2M system is provided, where the communication method includes:

the method comprises the steps that user equipment receives a primary synchronization signal PSS, a secondary synchronization signal SSS and a frame number FID sent by a base station;

the UE acquires a first time interval from successful receiving of the PSS to successful receiving of the SSS and a second time interval from successful receiving of the SSS to successful receiving of the FID;

and the user equipment determines the ratio of uplink and downlink subframes of the system according to the first time interval and the second time interval.

With reference to the first aspect, in a first implementation manner of the first aspect, the determining, by the ue, a ratio of uplink and downlink subframes of the system according to the first time interval and the second time interval includes:

obtaining the duration T of the first time interval_PSFor sub-frame duration T_sfA multiple of A;

obtaining the duration T of the second time interval_FSFor the subframe duration T_sfA multiple of B;

substituting the A and the B into a preset uplink and downlink subframe ratio relationship to determine the uplink and downlink subframe ratio of the system;

the preset uplink and downlink subframe proportioning relationship comprises: a. the_i，B_iThe ratio of uplink and downlink subframes of the corresponding system is C_i:D_i(ii) a Wherein, the A is_iB of the composition_iC of the catalyst_iD of the above_iAnd i is a positive integer, A is A_iA specific value of (A), B is B_iA specific value of (a).

With reference to the first implementation manner of the first aspect, on the first sideIn a second implementation manner of the present invention, the duration T of the second time interval is obtained_FSFor sub-frame duration T_sfThe multiple B of (a) includes:

if the T is_FSIf the time length of the superframe is not more than the time length of the superframe preset by the system, the T is set_FSAnd the T_sfThe ratio of (B) is determined as the B.

With reference to the first implementation manner of the first aspect, in a third implementation manner of the first aspect, the obtaining the duration T of the second time interval_FSFor sub-frame duration T_sfThe multiple B of (a) includes:

if the T is_FSIf the time length of the superframe is larger than the time length of the superframe preset by the system, the T is set_FSObtaining T 'by performing mold extraction on the time length of the superframe'_FSPrepared from T'_FSAnd the T_sfThe ratio of (B) is determined as the B.

With reference to any one of the first to third implementation manners of the first aspect, in a fourth implementation manner of the first aspect, a_i，B_iThe ratio of uplink and downlink subframes of the corresponding system is C_i:D_iThe method comprises the following steps:

A₁＝5,B₁the ratio of uplink and downlink subframes of the corresponding system is C4₁:D₁＝2:3；

A₂＝4,B₂The ratio of uplink and downlink subframes of the corresponding system is C4₂:D₂＝3:2；

A₃＝3,B₃The ratio of uplink and downlink subframes of the corresponding system is C4₃:D₃＝4:1；

A₄＝5,B₄The ratio of uplink and downlink subframes of the corresponding system is C₄:D₄＝5:5；

A₅＝5,B₅1, the ratio of uplink and downlink subframes of the corresponding system is C₅:D₅＝7:3；

A₆＝4,B₆1, the ratio of uplink and downlink subframes of the corresponding system is C₆:D₆＝8:2；

A₇＝3,B₇1 corresponds to the uplink and downlink of the systemThe sub-frame ratio is C₇:D₇＝9:1。

With reference to the first aspect and the foregoing implementation manner of the first aspect, in a fifth implementation manner of the first aspect, the communication method further includes:

and after determining the ratio of the uplink subframe to the downlink subframe of the system, the user equipment determines the uplink subframe, and sleeps the subframe which does not send information in the uplink subframe.

In a second aspect, a communication method of a machine-to-machine M2M system based on time division duplex TDD is provided, the communication method including:

the base station determines the positions of the sending subframes of a primary synchronization signal PSS, a secondary synchronization signal SSS and a frame number FID in a frame according to a frame structure preset by the system;

the base station sends the PSS, the SSS, and the FID to a user equipment UE at positions of transmission subframes of the PSS, the SSS, and the FID in the frame, respectively, so that the UE determines an uplink and downlink subframe ratio of the system according to a first time interval and a second time interval, where the first time interval is determined by positions of the transmission subframes of the PSS and the SSS in the frame, and the second time interval is determined by positions of the transmission subframes of the SSS and the FID in the frame.

With reference to the second aspect, in a first implementation manner of the second aspect, the determining, by the base station, positions of transmission subframes of a primary synchronization signal PSS, a secondary synchronization signal SSS, and an FID in a frame according to a frame structure preset by the system includes:

if the ratio of uplink subframes to downlink subframes of a frame structure preset by the system is 2:3, determining that the PSS is sent at a subframe 0 and a subframe 1 of the frame, the SSS is sent at a subframe 5 and a subframe 6 of the frame, and the FID is sent at a subframe 0 of the next frame of the frame, wherein the frame comprises 10 subframes; or,

if the ratio of uplink subframes to downlink subframes of a frame structure preset by the system is 3:2, determining that the PSS is sent at the subframe No. 0 and the subframe No. 1 of the frame, the SSS is sent at the subframe No. 4 and the subframe No. 5 of the frame, and the FID is sent at the subframe No. 9 of the frame, wherein the frame comprises 10 subframes; or,

if the ratio of uplink subframes to downlink subframes of a frame structure preset by the system is 4:1, determining that the PSS is sent at the No. 0 subframe and the No. 1 subframe of the frame, the SSS is sent at the No. 3 subframe and the No. 4 subframe of the frame, and the FID is sent at the No. 8 subframe of the frame, wherein the frame comprises 10 subframes; or,

if the ratio of uplink subframes to downlink subframes of a frame structure preset by the system is 5:5, determining that the PSS is sent in a subframe 0 and a subframe 1 of the frame, the SSS is sent in a subframe 5 and a subframe 6 of the frame, and the FID is sent in a subframe 9 of the frame, wherein the frame comprises 10 subframes; or,

if the ratio of uplink subframes to downlink subframes of a frame structure preset by the system is 7:3, determining that the PSS is sent in a subframe 0 and a subframe 1 of the frame, the SSS is sent in a subframe 5 and a subframe 6 of the frame, and the FID is sent in a subframe 7 of the frame, wherein the frame comprises 10 subframes; or,

if the ratio of uplink subframes to downlink subframes of a frame structure preset by the system is 8:2, determining that the PSS is sent in a subframe 0 and a subframe 1 of the frame, the SSS is sent in a subframe 4 and a subframe 5 of the frame, and the FID is sent in a subframe 6 of the frame, wherein the frame comprises 10 subframes; or,

if the ratio of uplink subframes to downlink subframes of a frame structure preset by the system is 9:1, it is determined that the PSS is transmitted in the subframe 0 and the subframe 1 of the frame, the SSS is transmitted in the subframe 3 and the subframe 4 of the frame, and the FID is transmitted in the subframe 5 of the frame, wherein the frame comprises 10 subframes.

In a third aspect, a user equipment is provided, including:

the receiving module is used for receiving a primary synchronization signal PSS, a secondary synchronization signal SSS and a frame number FID sent by a base station;

an obtaining module, configured to obtain a first time interval from when the receiving module successfully receives the PSS to when the receiving module successfully receives the SSS, and a second time interval from when the receiving module successfully receives the SSS to when the receiving module successfully receives the FID;

and the determining module is used for determining the ratio of the uplink subframe and the downlink subframe of the system according to the first time interval and the second time interval acquired by the acquiring module.

With reference to the third aspect, in a first implementation manner of the third aspect, the determining module includes:

a first obtaining unit, configured to obtain a duration T of the first time interval_PSFor sub-frame duration T_sfA multiple of A;

a second obtaining unit for obtaining the duration T of the second time interval_FSFor sub-frame duration T_sfA multiple of B;

a first determining unit, configured to substitute the a acquired by the first acquiring unit and the B acquired by the second acquiring unit into a preset uplink and downlink subframe matching relationship, so as to determine the uplink and downlink subframe matching of the system;

With reference to the first implementation manner of the third aspect, in a second implementation manner of the third aspect, the second obtaining unit is specifically configured to:

With reference to the first implementation manner of the third aspect, in a third implementation manner of the third aspect, the second obtaining unit is further configured to:

With reference to any one implementation manner of the first to third implementation manners of the third aspect, in a fourth implementation manner of the third aspect, a_i，B_iThe ratio of uplink and downlink subframes of the corresponding system is C_i:D_iThe method comprises the following steps:

A₇＝3,B₇1, the ratio of uplink and downlink subframes of the corresponding system is C₇:D₇＝9:1。

With reference to the third aspect and the foregoing implementation manner of the third aspect, in a fifth implementation manner of the third aspect, the method further includes:

and the dormancy module is used for determining the uplink subframe after the determining module determines the ratio of the uplink subframe to the downlink subframe of the system, so that the user equipment sleeps in the subframe which does not send information in the uplink subframe.

In a fourth aspect, a base station is provided, comprising:

a determining module, configured to determine, according to a frame structure preset by the system, positions of transmission subframes of a primary synchronization signal PSS, a secondary synchronization signal SSS, and a frame number FID in a frame;

and a sending module, configured to send, to a user equipment UE, the PSS, the SSS, and the FID at positions of transmission subframes of the PSS, the SSS, and the FID in the frame, respectively, so that the UE determines an uplink and downlink subframe ratio of the system according to a first time interval and a second time interval, where the first time interval is determined by positions of the PSS and the SSS in the frame, and the second time interval is determined by positions of the SSS and the FID in the frame.

With reference to the fourth aspect, in a first implementation manner of the fourth aspect, the determining module is specifically configured to:

In a fifth aspect, a communication system is provided, which includes the above user equipment and base station.

Based on the above technical solution, the TDD-based communication method, the user equipment, the base station, and the communication system of the M2M system according to the embodiments of the present invention can utilize TDD spectrum resources to implement M2M application, and the UE can determine the ratio of uplink and downlink subframes of the system in advance according to the first time interval and the second time interval, without determining the ratio of uplink and downlink subframes of the system through system information block SIB information, and further can adopt a corresponding sleep policy to reduce power consumption according to the ratio of uplink and downlink subframes of the system.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a frame structure diagram of a TDD-based M2M system according to an embodiment of the present invention.

Fig. 2 is a schematic flowchart of a communication method of a TDD-based M2M system according to an embodiment of the present invention.

Fig. 3 is another schematic flow chart of a communication method of a TDD-based M2M system according to an embodiment of the present invention.

Fig. 4 is still another schematic flow chart of a communication method of a TDD-based M2M system according to an embodiment of the present invention.

Fig. 5 is a schematic flowchart of a communication method of a TDD-based M2M system according to another embodiment of the present invention.

Fig. 6 is another schematic flow chart of a communication method of a TDD-based M2M system according to another embodiment of the present invention.

Fig. 7 is a schematic flowchart of a communication method of a TDD-based M2M system according to still another embodiment of the present invention.

Fig. 8 is a schematic block diagram of a user equipment according to an embodiment of the present invention.

Fig. 9 is a schematic block diagram of a base station according to an embodiment of the present invention.

Fig. 10 is a schematic block diagram of a communication system according to an embodiment of the present invention.

Fig. 11 is a schematic block diagram of a user equipment according to another embodiment of the present invention.

Fig. 12 is a schematic block diagram of a base station according to another embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The technical scheme of the invention can be applied to various communication systems, such as: global System for Mobile communications (GSM), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), General Packet Radio Service (GPRS), Long Term Evolution (LTE), TDD/FDD-based M2M, and so on.

User Equipment (UE), also called Mobile Terminal (Mobile Terminal), Mobile User Equipment, etc., may communicate with one or more core networks via a Radio Access Network (e.g., RAN), or may be a Terminal device based on TDD/FDD LTE-M system, and the User Equipment may be a Mobile Terminal, such as a Mobile phone (or called "cellular" phone) and a computer having a Mobile Terminal, for example, a portable, pocket, hand-held, computer-included or vehicle-mounted Mobile device, which exchange language and/or data with the Radio Access Network.

The Base Station may be a Base Transceiver Station (BTS) in GSM or CDMA, a Base Station (NodeB) in WCDMA, an evolved node b (eNB or e-NodeB) in LTE, or a Base Station based on TDD/FDD M2M system, which is not limited in the present invention.

In an FDD-based M2M System, a Resource Block (RB) in the frequency domain is 180KHz, and is divided into 12 physical channels, the channel interval is 15KHz, the signal bandwidth is 12KHz, and a UE access network needs to perform System synchronization first, and then can transmit and receive uplink and downlink data Information after receiving a System Information Block (SIB) and uplink and downlink channel indications. For example, in the system, a Physical Broadcast Synchronization Channel (PBSCH) is used for Frame Identification (FID) detection, symbol timing synchronization, carrier spectrum estimation, intra-superframe Frame index detection, and system information transmission by the UE, and since the signal bandwidth of the PBSCH is 12KHz, an 80 millisecond (ms) Frame length contains 960 symbols in total. The system comprises a Primary Synchronization Signal (PSS) with a length of 256 symbols, a Secondary Synchronization Signal (SSS) with a length of 257 symbols, and a superframe frame index indication sequence with a length of 127 symbols, wherein the rest 320 symbols are used for transmitting system information. The broadcast synchronization channel continuously broadcasts primary and secondary synchronization signals, frame numbers and system information to assist the UE in accessing the network.

In the embodiment of the present invention, in order to fully utilize the limited cellular network spectrum and meet the requirement of co-frequency co-site with the TDD system, a design of implementing a TDD-based M2M system using a TDD guard band is considered, a design of a downlink sub-channel following an FDD-based M2M system is considered in a frequency domain, for example, one RB may be 180KHz and divided into 15 sub-channels, one downlink sub-channel may be 12KHz, and a design of an FDD-based M2M system is also considered in a time domain, for example, a super-frame (super-frame) may be defined as 80ms, and a super-frame (frame) may be defined as 8 frames (frame) each of which is 10 ms. Each intra-frame is divided into 10 sub-frames (sub-frames), each of which is 1 ms.

It should be understood that the embodiment of the present invention is described by taking an RB of 180KHz as an example, but the present invention is not limited thereto, and an RB may be 360KHz, divided into 30 subchannels, and the like. It should also be understood that the embodiment of the present invention is described by taking the superframe as 80ms as an example, but the present invention is not limited thereto, and the superframe may be 120ms, 160ms, etc.

In addition, in order to ensure that the TDD-based M2M system does not interfere with the existing TDD system, it is considered to use the same uplink and downlink subframe allocation as that of the TDD system, for example, the same uplink and downlink subframe allocation as that of the LTE TDD system may be used, and then the uplink and downlink subframe allocation of the TDD-based M2M system may be as shown in table 1, where D represents a downlink subframe, S represents a special subframe, and U represents an uplink subframe. Under the condition, synchronization signals and frame numbers of a TDD-based M2M system need to be sent out in a short time to ensure that the UE can successfully perform synchronization and frame number detection, which is described by taking a downlink subframe ratio of 5:5 as an example, in a frame, subframes allowing to send downlink data are 0 subframe, 1 subframe, 5 subframe, 6 subframe and 9 subframe respectively, and since the primary and secondary synchronization signals and the frame numbers cannot be sent in a fragmented manner, a feasible sending method is to send the primary synchronization signals in the 0 subframe and the 1 subframe, send the secondary synchronization signals in the 5 subframe and the 6 subframe, and send the frame numbers in the 9 subframe, and in this case, the frame structure of the system is designed to be as shown in fig. 1, X # represents X subframe, and 0# -9 # represents 0 subframe to 9 subframe.

TABLE 1 TDD-BASED UPLINK AND UPLINK SUBMERSIBLE FRAME RATIO SUPPORTED by M2M SYSTEM

The downlink control management information of the TDD-based M2M system mainly includes a primary synchronization signal, a secondary synchronization signal, a frame number, a system information block, and the like. The PSS, SSS and FID sequence design adopts the design of an FDD-based M2M system. In the superframe, the first frame is used to transmit the primary and secondary synchronization signals and the frame number, and one or several sub-channels are considered to be used to transmit the primary and secondary synchronization signals and the frame number, for example, 15 sub-channels can be used to transmit the primary and secondary synchronization signals and the frame number, so that the primary and secondary synchronization signals and the frame number of the system can be transmitted in one or several consecutive downlink sub-frames, thereby ensuring that the user equipment can perform system synchronization and frame number detection.

As can be seen from the above description, in the TDD-based M2M communication system, a base station periodically communicates with a UE through a super-frame, the first frame in the super-frame is used to transmit PSS, SSS, and FID, after the PSS, SSS, and FID are transmitted, the base station continues to transmit SIB information, and the UE can determine the uplink and downlink subframe allocation of the system according to the SIB information, because the time for transmitting the SIB information is long, the UE needs to receive the SIB information after successfully receiving the PSS, SSS, and FID to determine the uplink and downlink subframe allocation of the system, and needs the minimum time length of one super-frame to complete the operations, which is very unfavorable for the UE with low power consumption, if the UE can determine the uplink and downlink subframe allocation of the system as soon as possible, the UE can select the uplink subframe without transmitting uplink information to sleep for power saving, and the communication method of the TDD-based M2M system provided in this embodiment of the present invention can utilize TDD spectrum resources to implement M2M application, and the base station can control the positions of the PSS, SSS and FID sending subframes in the frame, so that the UE can determine the ratio of the uplink subframe and the downlink subframe of the system in advance, and further adopt a corresponding sleep strategy to reduce the power consumption according to the ratio of the uplink subframe and the downlink subframe of the system.

Fig. 2 shows a schematic flow chart of a communication method 1000 of a TDD based M2M system according to an embodiment of the present invention, where the communication method 1000 may be performed by a user equipment, and as shown in fig. 2, the method 1000 includes:

s1100, receiving a primary synchronization signal PSS, a secondary synchronization signal SSS and a frame number FID sent by a base station by user equipment;

s1200, the ue obtains a first time interval from successful receiving of the PSS to successful receiving of the SSS, and a second time interval from successful receiving of the SSS to successful receiving of the FID;

and S1300, the UE determines the ratio of uplink and downlink subframes of the system according to the first time interval and the second time interval.

Specifically, the UE sequentially receives a primary synchronization signal PSS, a secondary synchronization signal SSS, and a frame number FID sent by a base station, obtains a first time interval and a second time interval, where the first time interval is a time interval from successful receiving of the PSS to successful receiving of the SSS, and the second time interval is a time interval from successful receiving of the SSS to successful receiving of the FID, and then determines an uplink and downlink subframe ratio of the system according to the first time interval and the second time interval. Optionally, the UE may obtain the first time interval according to a first time at which the PSS is successfully received and a second time at which the SSS is successfully received, and obtain the second time interval according to the second time at which the SSS is successfully received and a third time at which the FID is successfully received. Optionally, the UE may determine the uplink and downlink subframe ratio of the system according to the ratio relationship between the first time interval and the second time interval and the preconfigured uplink and downlink subframe ratio.

Therefore, the communication method of the TDD-based M2M system according to the embodiment of the present invention can utilize TDD spectrum resources to implement M2M application, and the UE can determine the uplink and downlink subframe allocation of the system in advance according to the first time interval and the second time interval, without determining the uplink and downlink subframe allocation of the system through SIB information, and further can adopt a corresponding sleep policy according to the uplink and downlink subframe allocation of the system to reduce power consumption.

It should be understood that, in the embodiment of the present invention, the UE may further determine the uplink and downlink subframe ratio of the system according to the third time interval from the successful reception of the PSS to the successful reception of the FID, and the first time interval; or, the UE may determine the uplink and downlink subframe ratio of the system according to the second time interval and the third time interval, in other words, as long as the UE can uniquely determine the uplink and downlink subframe ratio of the system according to the relationship between the first time, the second time, and the third time.

Optionally, in the embodiment of the present invention, the UE receives the primary synchronization signal sent by the base station, and if the reception fails, the UE receives the primary synchronization signal sent by the base station again in the next superframe; similarly, the UE receives the secondary synchronization signal sent by the base station, fails to receive the secondary synchronization signal, re-receives the primary synchronization signal sent by the base station in the next superframe, and re-acquires the first time interval between successful receiving of the PSS and successful receiving of the SSS; when the frame number detection fails, the UE does not need to perform primary and secondary synchronization again, and only needs to re-receive the frame number sent by the base station in the next superframe and perform frame number detection again, so that after the SSS is successfully received, the frame number may be successfully received at a time interval greater than the time length of the superframe.

Optionally, in this embodiment of the present invention, as shown in fig. 3, the determining, by the ue, the ratio of uplink and downlink subframes of the system according to the first time interval and the second time interval includes:

s1310, obtaining the duration T of the first time interval_PSFor sub-frame duration T_sfA multiple of A;

s1320, obtaining the duration T of the second time interval_FSFor the subframe duration T_sfA multiple of B;

s1330, substituting the A and the B into a preset uplink and downlink subframe ratio relationship to determine the uplink and downlink subframe ratio of the system;

Specifically, after the UE acquires the first time interval and the second time interval, the UE acquires the duration T of the first time interval_PSFor sub-frame duration T_sfObtaining the duration T of the second time interval_FSFor sub-frame duration T_sfAnd then substituting the A and the B into a preset uplink and downlink subframe ratio relationship, thereby determining the uplink and downlink subframe ratio of the system. The preset isThe uplink and downlink subframe proportioning relationship may include: a. the_i，B_iThe ratio of uplink and downlink subframes of the corresponding system is C_i:D_i(ii) a Wherein, the A is_iB of the composition_iC of the catalyst_iD of the above_iAnd i is a positive integer, A is A_iA specific value of (A), B is B_iA specific value of (a). That is, after the UE obtains the parameters a and B, compare a in the preconfigured uplink and downlink subframe proportioning relationship_iAnd B_iIf there is a group A_iA and B_iThen determine the group a_i，B_iCorresponding to C_i:D_iAnd allocating uplink and downlink subframes of the system.

If the first time interval is not an integer multiple of the duration of the sub-frame, i.e. the M.T_sf＜T_PS＜(M+0.5)·T_sfOr (M + 0.5). T_sf≤T_PS＜(M+1)·T_sfWherein M is a positive integer, optionally at T_PSSatisfy M.T_sf＜T_PS＜(M+0.5)·T_sfThen, the T can be_PSConversion to M.T_sfAt the time of T_PSSatisfies (M + 0.5). T_sf≤T_PS＜(M+1)·T_sfThe first time interval T can be set_PSConversion to (M + 1). T_sfThen reuse the converted T_PSFor sub-frame duration T_sfRatioing to obtain A, e.g. T_sf＝1ms,T_PS4.5T when the total time is 4.6ms_sf<T_PS<5T_sfWill be T_PSConversion to 5T_sfThen for the T_sfAnd obtaining a ratio, and determining that A is 5. Similarly, if the second time interval is not an integer multiple of the subframe duration, a similar processing method may also be used to obtain B, which is not described herein again.

In the embodiment of the present invention, the duration T of the second time interval is obtained_FSFor sub-frame duration T_sfThe multiple B of (a) includes:

Since it is possible that the FID is successfully received after the SSS is successfully received, with a time interval greater than the superframe, in this case, the duration T of the second time interval is obtained_FSFor sub-frame duration T_sfThe multiple B of (a) includes:

For example, when the duration of the superframe is 80ms, the duration T of the subframe_sfIs 1ms if the second time interval T_FS4ms, less than the duration of the superframe, then the parameter B is the T_FSAnd the T_sfThe ratio of (A) to (B) is 4; if the second time interval is 84ms, which is greater than the superframe duration, then T is determined_FSModulo 80ms, i.e. taking the T_FSThe remainder obtained by dividing by 80ms is determined as T'_FSI.e. T'_FS4ms, then the T'_FSAnd T_sfIs determined as B, i.e. B equals 4.

Alternatively, the A is_i，B_iThe ratio of uplink and downlink subframes of the corresponding system is C_i:D_iThe method comprises the following steps:

That is, the A_i，B_iAnd the ratio C of uplink and downlink subframes of the system_i:D_iThe correspondence of (a) can be as shown in table 2.

TABLE 2 (A)_i、B_iAnd uplink and downlink subframe ratio C_i:D_iCorresponding relation of (1)

i	A_i	B_i	C_i:D_i
				1	5	4	2:3
2	4	4	3:2
				3	3	4	4:1
4	5	3	5:5
				5	5	1	7:3
6	4	1	8:2
				7	3	1	9:1

For example, if the UE determines that a is 5 and B is 4 according to the first time interval and the second time interval after acquiring the first time interval and the second time interval, and then substitutes the a and B into the corresponding relationship in table 2, it may determine that a is₁＝5＝A，B₁B is 4, so that the uplink and downlink subframe ratio of the system can be determined to be C₁:D₁2: 3; for another example, when the UE determines that a is 4 and B is 1 from the first time interval and the second time interval, a may be determined by substituting the correspondence relationship in table 2₆＝4＝A，B₆1-B, so that the uplink and downlink subframe ratio of the system can be determined as C₆:D₆＝8:2。

It is understood that A is_i，B_iAnd the ratio C of uplink and downlink subframes of the system_i:D_iIs not unique as long as in the corresponding relationship, can be according to the A_i，B_iThe uplink and downlink subframe ratio of the system is determined only, and the embodiment of the invention only takes the corresponding relation in table 2 as an exampleThe embodiments of the present invention may also have other corresponding relationships. For example, the preconfigured uplink and downlink subframe proportioning relationship may also be as shown in table 3.

TABLE 3 (A)_i、B_iAnd uplink and downlink subframe ratio C_i:D_iCorresponding relation of (1)

i	A_i	B_i	C_i:D_i
				1	5	4	2:3
2	4	1	3:2
				3	3	2	4:1
4	5	3	5:5
				5	5	1	7:3
6	4	2	8:2
				7	3	1	9:1

Due to the same group A_i，B_iThe value of (C) may correspond to different uplink and downlink subframe ratios C_i:D_iFor example, in Table 2, the A₆＝4，B₆Uplink and downlink subframe ratio C of system corresponding to 1₆:D₆Is 8:2, and in Table 3, the A₂＝4，B₂Uplink and downlink subframe ratio C of system corresponding to 1₂:D₂3:2, therefore, it is required that the UE obtains the preconfigured uplink and downlink subframe matching relationship in advance, so that after the UE determines a and B according to the first time interval and the second time interval, the uplink and downlink subframe matching of the system is determined according to the preconfigured uplink and downlink subframe matching relationship.

Fig. 4 is a schematic flow chart of a communication method 4000 of a TDD-based M2M system according to another embodiment of the present invention. The following describes a communication method 4000 of the TDD based M2M system according to an embodiment of the present invention in detail by taking the flowchart shown in fig. 4 as an example.

In S4100, the UE receives the PSS sent by the base station, and after the reception is successful, the process proceeds to S4200, otherwise, the reception fails, and S4100 is executed again, that is, the UE re-receives the PSS sent by the base station in the first frame of the next super frame.

In S4200, the UE receives the SSS sent by the base station, and the process goes to S4300, otherwise, the process goes back to S4100 again, and the UE receives the PSS sent by the base station again in the next superframe.

In S4300, a first time interval T is obtained at the UE_PSThe first time interval is a time interval from successful reception of the SSS to successful reception of the SSS.

In S4400, the UE receives the FID sent by the base station, and if the reception is successful, the process proceeds to S4500, otherwise, the FID signal sent by the base station is received again, without performing system primary and secondary synchronization, that is, S4400 is executed again in the next superframe, and without performing the operations in S4100 to S4300, so that after the SSS is successfully received, the frame number may be successfully received at an interval greater than the time length of one superframe.

In S4500, the UE acquires a second time interval T_FSThe second time interval is a time interval from successful reception of the SSS to successful reception of the FID.

In S4600, the duration T of the first time interval is obtained_PSFor sub-frame duration T_sfA multiple of a.

If the T is_PSIs an integer multiple of the subframe duration, then A is T_PSAnd subframe duration T_sfThe ratio of (A) to (B); if the T is_PSNot integer times of sub-frame duration, then the T is first_PSConverting into integral multiple of sub-frame duration, and then converting into sub-frame duration T_sfThe ratio is obtained and the conversion method is the same as that described above, and is not described herein again.

In S4700, it is determined whether the second time interval is greater than the time length of the superframe preset by the system, and if not, the process proceeds to S4800, otherwise, the process proceeds to S4900.

In S4800, the T_FSNot more than the time length of the superframe preset by the system, and determining the B as the T_FSAnd the T_sfThe ratio of (a) to (b).

And the T_PSSimilarly, if T is_FSThe sub-frame duration is not integral multiple, and the T is also required to be firstly carried out_FSSub-frame duration converted to integer multiples, conversion method and T_PSThe conversion method is similar and will not be described again.

In S4900, T_FSIf the time length of the superframe is larger than the time length of the superframe preset by the system, the T is set_FSObtaining T 'by performing mold extraction on the time length of the superframe'_FSDetermining that B is the T'_FSAnd T_sfThe ratio of (a) to (b).

With superframe duration of 80ms and subframe duration T_sfFor example, if the second time interval is 84ms, which is greater than the duration of a superframe, then T is determined_FSModulo 80ms, i.e. taking the T_FSThe remainder obtained by dividing by 80ms is determined as T'_FSI.e. T'_FS4ms, then the T'_FSAnd T_sfIs determined as B, i.e. B equals 4.

In S5000, the uplink and downlink subframe ratio of the system is determined according to the ratio relationship between the a and B and the preconfigured uplink and downlink subframe.

Specifically, substituting A and B into a pre-configured uplink and downlink subframe proportioning relationship to determine that a group A exists_i＝A，B_iWhen B, then the group a_i，B_iCorresponding to C_i:D_iNamely the uplink and downlink subframe ratio of the system.

For example, the preconfigured uplink and downlink subframe allocation relationship may be as shown in table 2, and when the UE determines that a is 5 and B is 1, the UE substitutes the a into the preconfigured uplink and downlink subframe allocation relationship in table 2, so that a can be found₅5 ═ a and B₅1-B, so that the uplink and downlink subframe ratio of the system can be determined as C₅:D₅＝7:3。

Optionally, in this embodiment of the present invention, the communication method 1000 further includes:

Specifically, after determining the ratio of the uplink subframe and the downlink subframe of the system, the UE may determine which subframes are uplink subframes according to the ratio of the uplink subframe and the downlink subframe of the system, so as to formulate a corresponding sleep strategy to achieve the purpose of reducing power consumption, optionally, the UE may select a subframe, which does not send uplink information, from the uplink subframes to sleep, for example, the UE for remote meter reading may determine subframes No. 2, No. 3, No. 4, No. 7, and No. 8 as uplink subframes after obtaining the ratio of the uplink subframe and the downlink subframe of the system as 5:5, and may select a subframe, which does not report data, from the uplink subframes to sleep, so as to achieve the purpose of reducing power consumption.

The communication method of the TDD based M2M system according to the embodiment of the present invention is described above from the perspective of the UE with reference to fig. 2 to 4, and the communication method of the TDD based M2M system according to the embodiment of the present invention is described below from the perspective of the base station with reference to fig. 5 and 6.

Fig. 5 shows a schematic flow chart of a communication method 5000 of a TDD based M2M system according to an embodiment of the present invention, where the method 5000 may be performed by a base station, and the communication method 5000 includes:

s5100, a base station determines the positions of the sending subframes of a primary synchronization signal PSS, a secondary synchronization signal SSS and a frame number FID in a frame according to a frame structure preset by the system;

s5200, the base station sends, to a user equipment UE, the PSS, the SSS, and the FID at positions of transmission subframes of the PSS, the SSS, and the FID in the frame, respectively, so that the UE determines an uplink and downlink subframe ratio of the system according to a first time interval and a second time interval, the first time interval being determined by positions of the transmission subframes of the PSS and the SSS in the frame, and the second time interval being determined by positions of the transmission subframes of the SSS and the FID in the frame.

Specifically, a base station determines positions of transmission subframes of a primary synchronization signal, a secondary synchronization signal and a frame number in a frame according to a frame structure preset by a system, then transmits the PSS, the SSS and the FID to a UE at the positions of the transmission subframes of the PSS, the SSS and the FID in the frame, so that the UE determines the first time interval according to the positions of the transmission subframes of the PSS and the SSS in the frame, determines the second time interval according to the positions of the transmission subframes of the SSS and the FID in the frame, and then determines uplink and downlink subframe ratio of the system according to the first time interval and the second time interval. That is, the base station can enable the UE to determine the uplink and downlink subframe ratio of the system according to the acquired first time interval and second time interval by controlling the positions of the transmission subframes of the PSS, the SSS, and the FID in the frame. Taking the above downlink subframe ratio 3:2 as an example, the bs may send the PSS in subframe 0 and subframe 1 of the first frame of the superframe, send the SSS in subframe 4 and subframe 5 of the frame, and send the FID in subframe 9 of the frame, so that the UE successfully receives the PSS in subframe 1 and the SSS in subframe 5, and the first time interval from the UE successfully receiving the PSS to the successful receiving of the SSS, that is, the time interval between subframe 5 and subframe 1, is 4T_sfSimilarly, if the FID is successfully received in the 9 th subframe, the second time interval from the successful receiving of the SSS to the successful receiving of the FID, i.e. the 9 th subframe and the 5 th subframe, is 4T_sfOptionally, the base station may pre-configure the correspondence between the first time interval and the second time interval and the uplink and downlink subframe ratio of the system to the UE. The preconfigured uplink and downlink subframe proportioning relationship may include that the first time interval is 4T_sfThe second time interval is 4T_sfWhen the ratio of uplink and downlink subframes of the corresponding system is 3:2, the ratio is thatThe UE may acquire the first time interval as 4T_sfThe second time interval is 4T_sfAnd then, according to the pre-configured uplink and downlink subframe ratio relationship, determining that the uplink and downlink subframe ratio of the system is 3: 2. The base station only needs to control the positions of the PSS, SSS, and FID transmission subframes in the frame, so that the first time interval and the second time interval are not all the same as the two values in other uplink and downlink subframe ratios.

Therefore, the communication method of the TDD-based M2M system according to the embodiment of the present invention can utilize TDD spectrum resources to implement M2M application, and the base station can control the positions of the PSS, SSS, and FID transmission subframes in a frame, so that the UE can determine the uplink and downlink subframe ratio of the system in advance, without determining the uplink and downlink subframe ratio of the system through SIB information, and further can adopt a corresponding sleep policy to reduce power consumption according to the uplink and downlink subframe ratio of the system.

Optionally, in this embodiment of the present invention, as shown in fig. 6, the determining, by the base station, the sending time of the primary synchronization signal PSS, the secondary synchronization signal SSS, and the frame number FID according to the uplink and downlink subframe ratio of the system includes:

s5110, if the ratio of uplink subframes to downlink subframes of a frame structure preset by the system is 2:3, determining to send the PSS at the subframe No. 0 and the subframe No. 1 of the frame, send the SSS at the subframe No. 5 and the subframe No. 6 of the frame, and send the FID at the subframe No. 0 of the next frame of the frame, wherein the frame comprises 10 subframes; or,

s5120, if the ratio of uplink subframes to downlink subframes of a frame structure preset by the system is 3:2, determining to send the PSS in the subframe No. 0 and the subframe No. 1 of the frame, send the SSS in the subframe No. 4 and the subframe No. 5 of the frame, and send the FID in the subframe No. 9 of the frame, wherein the frame comprises 10 subframes; or,

s5130, if the ratio of uplink subframes to downlink subframes of a frame structure preset by the system is 4:1, determining to send the PSS in the subframe No. 0 and the subframe No. 1 of the frame, send the SSS in the subframe No. 3 and the subframe No. 4 of the frame, and send the FID in the subframe No. 8 of the frame, wherein the frame comprises 10 subframes; or,

s5140, if the ratio of uplink subframes to downlink subframes of a frame structure preset by the system is 5:5, determining to send the PSS in the subframe No. 0 and the subframe No. 1 of the frame, send the SSS in the subframe No. 5 and the subframe No. 6 of the frame, and send the FID in the subframe No. 9 of the frame, wherein the frame comprises 10 subframes; or,

s5150, if the ratio of uplink subframes to downlink subframes of a frame structure preset by the system is 7:3, determining to send the PSS in the subframe No. 0 and the subframe No. 1 of the frame, send the SSS in the subframe No. 5 and the subframe No. 6 of the frame, and send the FID in the subframe No. 7 of the frame, wherein the frame comprises 10 subframes; or,

s5160, if the ratio of uplink subframes to downlink subframes of a frame structure preset by the system is 8:2, determining to send the PSS in the subframe No. 0 and the subframe No. 1 of the frame, send the SSS in the subframe No. 4 and the subframe No. 5 of the frame, and send the FID in the subframe No. 6 of the frame, wherein the frame comprises 10 subframes; or,

s5170, if the ratio of uplink subframes to downlink subframes of a frame structure preset by the system is 9:1, determining to send the PSS in the subframe No. 0 and the subframe No. 1 of the frame, send the SSS in the subframe No. 3 and the subframe No. 4 of the frame, and send the FID in the subframe No. 5 of the frame, wherein the frame comprises 10 subframes.

Specifically, if the ratio of uplink subframes to downlink subframes of the system is 2:3, the base station may control the PSS to be transmitted in subframe 0 and subframe 1 of a frame, the SSS to be transmitted in subframe 5 and subframe 6 of the frame, and the FID to be transmitted in subframe 0 of the next frame of the frame, so that the UE successfully receives the PSS in subframe 1 and the SSS in subframe 6, where the first time interval is 5T, which is the time interval between subframe 6 and subframe 1_sfLikewise, the second time interval from successful reception of the SSS to successful reception of the FID is 4T_sf；

If the ratio of uplink and downlink subframes of the system is 3:2, the base station can control the PSS to be sent in the subframe No. 0 and the subframe No. 1 of the frame, the SSS to be sent in the subframe No. 4 and the subframe No. 5 of the frame, and the FID to be sent in the subframe No. 9 of the frame, then the UE successfully receives the PSS in the subframe No. 1 and the SSS in the subframe No. 5, and the first time interval is 4T between the subframe No. 5 and the subframe No. 1_sfLikewise, the SSS is successfully receivedThe second time interval for successful reception of the FID is 4T_sf；

If the ratio of uplink subframes to downlink subframes of a frame structure preset by the system is 4:1, determining that the PSS is sent at the No. 0 subframe and the No. 1 subframe of the frame, the SSS is sent at the No. 3 subframe and the No. 4 subframe of the frame, and the FID is sent at the No. 8 subframe of the frame, then the UE successfully receives the PSS at the No. 1 subframe and successfully receives the SSS at the No. 4 subframe, and the first time interval is the time interval 3T between the No. 4 subframe and the No. 1 subframe_sfLikewise, the second time interval from successful reception of the SSS to successful reception of the FID is 4T_sf；

If the ratio of uplink subframes to downlink subframes of a frame structure preset by the system is 5:5, it is determined that the PSS is transmitted in the subframe No. 0 and the subframe No. 1 of the frame, the SSS is transmitted in the subframe No. 5 and the subframe No. 6 of the frame, and the FID is transmitted in the subframe No. 9 of the frame, so that the UE successfully receives the PSS in the subframe No. 1 and the SSS in the subframe No. 6, and the first time interval is 5T between the subframe No. 6 and the subframe No. 1_sfLikewise, the second time interval from successful reception of the SSS to successful reception of the FID is 3T_sf；

If the ratio of uplink subframes to downlink subframes of a frame structure preset by the system is 7:3, it is determined that the PSS is transmitted in the subframe No. 0 and the subframe No. 1 of the frame, the SSS is transmitted in the subframe No. 5 and the subframe No. 6 of the frame, the FID is transmitted in the subframe No. 7 of the frame, the UE successfully receives the PSS in the subframe No. 1 and the SSS in the subframe No. 6, and the first time interval is the time interval 5T between the subframe No. 6 and the subframe No. 1_sfLikewise, the second time interval from successful reception of the SSS to successful reception of the FID is 1T_sf；

If the ratio of uplink subframes to downlink subframes of a frame structure preset by the system is 8:2, it is determined that the PSS is transmitted in the subframe No. 0 and the subframe No. 1 of the frame, the SSS is transmitted in the subframe No. 4 and the subframe No. 5 of the frame, and the FID is transmitted in the subframe No. 6 of the frame, so that the UE successfully receives the PSS in the subframe No. 1 and the SSS in the subframe No. 5, and the first time interval is 4T between the subframe No. 5 and the subframe No. 1_sfLikewise, the second time interval from successful reception of the SSS to successful reception of the FID is 1T_sf；

If the ratio of uplink subframes to downlink subframes of a frame structure preset by the system is 9:1, determining that the PSS is sent at the No. 0 subframe and the No. 1 subframe of the frame, the SSS is sent at the No. 3 subframe and the No. 4 subframe of the frame, and the FID is sent at the No. 5 subframe of the frame, then the UE successfully receives the PSS at the No. 1 subframe and successfully receives the SSS at the No. 4 subframe, and the first time interval is the time interval 3T between the No. 4 subframe and the No. 1 subframe_sfLikewise, the second time interval from successful reception of the SSS to successful reception of the FID is 1T_sf；

In general, the base station controls the positions of the transmission subframes of the PSS, the SSS, and the FID in a frame, so that the UE can determine the ratio of the uplink and downlink subframes of the system according to the acquired first time interval and second time interval, and optionally, the base station may pre-configure the ratio of the uplink and downlink subframes of the system to the UE, so that the UE can determine the ratio of the uplink and downlink subframes of the system according to the first time interval, the second time interval, and the pre-configured ratio of the uplink and downlink subframes after acquiring the first time interval and the second time interval.

Optionally, in this embodiment of the present invention, the base station determines, according to a ratio of uplink and downlink subframes of the system, transmission timings of a primary synchronization signal PSS, a secondary synchronization signal SSS, and a frame number FID, and further includes:

if the ratio of uplink subframes to downlink subframes of a frame structure preset by the system is 3:2, determining that the PSS is sent at the No. 0 subframe and the No. 1 subframe of the frame, the SSS is sent at the No. 4 subframe and the No. 5 subframe of the frame, and the FID is sent at the No. 6 subframe of the frame, wherein the frame comprises 10 subframes; or,

if the ratio of uplink subframes to downlink subframes of a frame structure preset by the system is 4:1, determining that the PSS is sent at the subframe No. 0 and the subframe No. 1 of the frame, the SSS is sent at the subframe No. 3 and the subframe No. 4 of the frame, and the FID is sent at the subframe No. 6 of the frame, wherein the frame comprises 10 subframes; or,

if the ratio of uplink subframes to downlink subframes of a frame structure preset by the system is 8:2, determining that the PSS is sent at the No. 0 subframe and the No. 1 subframe of the frame, the SSS is sent at the No. 4 subframe and the No. 5 subframe of the frame, and the FID is sent at the No. 7 subframe of the frame, wherein the frame comprises 10 subframes; or,

It should be understood that the positions of the transmission subframes of the PSS, SSS, and FID in a frame are not unique, as long as the UE can uniquely determine the uplink and downlink subframe ratio of the system according to the first time interval and the second time interval after acquiring the first time interval and the second time interval according to the positions of the transmission subframes of the PSS, SSS, and FID in the frame.

Therefore, the communication method of the TDD-based M2M system according to the embodiment of the present invention can implement M2M communication by using TDD spectrum resources, and the base station can control the positions of the PSS, SSS, and FID transmission subframes in a frame, so that the UE can determine the ratio of uplink and downlink subframes of the system in advance, without determining the ratio of uplink and downlink subframes of the system through SIB information, and further can adopt a corresponding sleep policy to reduce power consumption according to the ratio of uplink and downlink subframes of the system.

The communication method of the TDD based M2M system according to the embodiment of the present invention is described in detail from the perspective of the user equipment and the base station, respectively, in conjunction with fig. 2 to 6; a communication method of the TDD based M2M system according to an embodiment of the present invention is described below with reference to fig. 7 from the perspective of device interaction in a communication system including a user equipment and a base station.

Fig. 7 is a schematic flowchart illustrating a communication method of a TDD-based M2M system according to an embodiment of the present invention.

In S210, the base station determines the positions of the transmission subframes of the primary synchronization signal PSS, the secondary synchronization signal SSS, and the frame number FID in the frame according to the frame structure preset by the system.

Optionally, in this embodiment of the present invention, the determining, by the base station, positions of transmission subframes of a primary synchronization signal PSS, a secondary synchronization signal SSS, and a frame number FID in a frame according to a frame structure preset by the system includes:

It should be understood that the positions of the transmission subframes of the PSS, SSS, and FID in the frame are not unique, as long as the base station controls the positions of the transmission subframes of the PSS, SSS, and FID in the frame, so that the UE can uniquely determine the uplink and downlink subframe ratio of the system according to a first time interval from successful reception of the PSS to successful reception of the SSS, and a second time interval from successful reception of the SSS to successful reception of the FID.

In S220, the base station transmits the PSS, the SSS, and the FID to the user equipment UE at the position of the transmission subframes of the PSS, the SSS, and the FID in the frame, respectively.

At S230, the UE receives the PSS, the SSS, and the FID transmitted by the base station, and acquires a first time interval from successful receiving of the PSS to successful receiving of the SSS, and a second time interval from successful receiving of the SSS to successful receiving of the FID.

At S240, the UE determines the uplink and downlink subframe ratio of the system according to the first time interval and the second time interval.

Optionally, the determining, by the UE, the uplink and downlink subframe ratio of the system according to the first time interval and the second time interval includes:

Specifically, after the UE acquires the first time interval and the second time interval, the UE acquires the duration T of the first time interval_PSFor sub-frame duration T_sfObtaining the duration T of the second time interval_FSFor sub-frame duration T_sfAnd then substituting the A and the B into a preset uplink and downlink subframe ratio relationship, thereby determining the uplink and downlink subframe ratio of the system. In other words, after the UE obtains the parameters a and B, a in the preconfigured uplink and downlink subframe proportioning relationship is compared_iAnd B_iIf there is a group A_iA and B_iThen determine the group a_i，B_iCorresponding to C_i:D_iAnd allocating uplink and downlink subframes of the system.

The communication method of the TDD based M2M system according to the embodiment of the present invention is described in detail above with reference to fig. 2 to 7, and the apparatus of the TDD based M2M system according to the embodiment of the present invention is described below with reference to fig. 8 to 12.

Fig. 8 shows a schematic block diagram of a user equipment 500 according to an embodiment of the present invention, the user equipment 500 comprising:

a receiving module 510, configured to receive a primary synchronization signal PSS, a secondary synchronization signal SSS, and a frame number FID sent by a base station;

an obtaining module 520, configured to obtain a first time interval from when the receiving module 510 successfully receives the PSS to when the SSS is successfully received, and a second time interval from when the receiving module 510 successfully receives the SSS to when the FID is successfully received;

a determining module 530, configured to determine an uplink and downlink subframe ratio of the system according to the first time interval and the second time interval obtained by the obtaining module 520.

Specifically, the receiving module 510 receives a primary synchronization signal PSS, a secondary synchronization signal SSS, and a frame number FID sent by a base station, the obtaining module 520 obtains a first time interval and a second time interval, where the first time interval is a time interval from successful receiving of the PSS to successful receiving of the SSS, the second time interval is a time interval from successful receiving of the SSS to successful receiving of the FID, and then the determining module 530 determines an uplink and downlink subframe ratio of the system according to the first time interval and the second time interval obtained by the obtaining module 520. Optionally, the obtaining module 520 may obtain the first time interval according to a first time when the PSS is successfully received and a second time when the SSS is successfully received, and obtain the second time interval according to the second time when the SSS is successfully received and a third time when the FID is successfully received. Optionally, the determining module 530 may determine the uplink and downlink subframe ratio of the system according to the ratio relationship between the first time interval and the second time interval and the preconfigured uplink and downlink subframe ratio.

Therefore, the user equipment of the embodiment of the invention can determine the ratio of the uplink subframe and the downlink subframe of the system in advance according to the first time interval and the second time interval without determining the ratio of the uplink subframe and the downlink subframe of the system through SIB information, and further can adopt a corresponding sleep strategy according to the ratio of the uplink subframe and the downlink subframe of the system to reduce power consumption.

Optionally, in this embodiment of the present invention, the receiving module 510 receives a primary synchronization signal sent by a base station, and after the receiving fails, receives the primary synchronization signal sent by the base station again in a next superframe; similarly, the receiving module 510 receives the secondary synchronization signal sent by the base station, and after the receiving fails, re-receives the primary synchronization signal sent by the base station in the next superframe; when the frame number detection fails, the receiving module 510 only needs to receive the frame number sent by the base station again in the next super frame and perform the frame number detection again without performing primary and secondary synchronization, and therefore, after successfully receiving the SSS, the frame number may be successfully received at a time interval greater than the time length of the super frame.

Optionally, in an embodiment of the present invention, the determining module 530 includes:

a second obtaining unit for obtaining the duration T of the second time interval_FSFor the subframe duration T_sfA multiple of B;

Specifically, after the obtaining module 520 obtains the first time interval and the second time interval, the first obtaining unit obtains the duration T of the first time interval_PSFor sub-frame duration T_sfA second obtaining unit obtains the duration T of the second time interval_FSFor sub-frame duration T_sfThen the first determining unit substitutes the a and the B into a preset uplink and downlink subframe matching relationship, so as to determine the uplink and downlink subframe matching of the system, where the preset uplink and downlink subframe matching relationship may include: a. the_i，B_iThe ratio of uplink and downlink subframes of the corresponding system is C_i:D_i(ii) a Wherein, the A is_iB of the composition_iC of the catalyst_iD of the above_iAnd i is a positive integer, A is A_iA specific value of (A), B is B_iA specific value of (a). That is to say, after obtaining the parameters a and B, the first determining unit compares a in the preconfigured uplink and downlink subframe proportioning relationship_iAnd B_iIf there is a group A_iA and B_iThen determine the group a_i，B_iCorresponding to C_i:D_iNamely the uplink and downlink subframe ratio of the system.

In an embodiment of the present invention, the second obtaining unit is specifically configured to:

Since it is possible that the FID is successfully received after successfully receiving the SSS, with a time length larger than a superframe, in this case, the second acquisition unit is further configured to:

That is, after the first obtaining unit and the second obtaining unit obtain the values of a and B, the first determining unit substitutes the above uplink and downlink subframe proportioning relationship, if there is a group of a_i＝A，B_iThen the first determination unit determines the group a_i，B_iCorresponding uplink and downlink subframe ratio C_i:D_iNamely the uplink and downlink subframe ratio of the system.

Optionally, in this embodiment of the present invention, the user equipment 500 further includes:

and the dormancy module is used for determining the uplink subframe after determining the proportion of the uplink subframe and the downlink subframe of the system, so that the user equipment sleeps in the subframe which does not send information in the uplink subframe.

Specifically, after the determining module 530 determines the ratio of the uplink subframe and the downlink subframe of the system, the sleep module may determine which subframes are uplink subframes according to the ratio of the uplink subframe and the downlink subframe of the system, so as to formulate a corresponding sleep strategy, so as to achieve the purpose of reducing power consumption.

The user equipment 500 according to the embodiment of the present invention may correspond to the UE in the communication method 1000 of the TDD based M2M system according to the embodiment of the present invention, and the above and other operations and/or functions of each module in the user equipment 500 are respectively for implementing corresponding processes of each aforementioned method, and are not described herein again for brevity.

Fig. 9 shows a schematic block diagram of a base station 600 according to an embodiment of the invention, the base station 600 comprising:

a determining module 610, configured to determine, according to a frame structure preset by the system, positions of transmission subframes of a primary synchronization signal PSS, a secondary synchronization signal SSS, and a frame number FID in a frame;

a sending module 620, configured to send, to a user equipment UE, the PSS, the SSS, and the FID at positions of transmission subframes of the PSS, the SSS, and the FID in the frame, respectively, so that the UE determines an uplink and downlink subframe ratio of the system according to a first time interval and a second time interval, where the first time interval is determined by positions of the transmission subframes of the PSS and the SSS in the frame, and the second time interval is determined by positions of the transmission subframes of the SSS and the FID in the frame.

Specifically, the determining module 610 determines positions of transmission subframes of a primary synchronization signal, a secondary synchronization signal and a frame number in a frame according to a frame structure preset by a system, and then the transmitting module 620 transmits the PSS, the SSS and the FID to the UE at the positions of the transmission subframes of the PSS, the SSS and the FID in the frame, respectively, so that the UE determines the first time interval according to the positions of the transmission subframes of the PSS and the SSS in the frame, determines the second time interval according to the positions of the transmission subframes of the SSS and the FID in the frame, and then determines an uplink and downlink subframe ratio of the system according to the first time interval and the second time interval. That is, the determining module 610 controls the transmission of the PSS, the SSS and the FIDAnd sending the position of the subframe in the frame, so that the UE can determine the ratio of the uplink subframe and the downlink subframe of the system according to the acquired first time interval and the acquired second time interval. Taking the above downlink subframe ratio 3:2 as an example, the determining module 610 may determine that the PSS is transmitted in the subframe No. 0 and the subframe No. 1 of the first frame of the super frame, the SSS is transmitted in the subframe No. 4 and the subframe No. 5 of the frame, the FID is transmitted in the subframe No. 9 of the frame, when the duration of the super frame is 80ms, the UE successfully receives the PSS in the subframe No. 1, the SSS in the subframe No. 5, and the time interval from the UE successfully receiving the PSS to the SSS successfully receiving, that is, the time interval between the subframe No. 5 and the subframe No. 1, is 4T_sfSimilarly, if the FID is successfully received in the 9 th subframe, the second time interval from the successful receiving of the SSS to the successful receiving of the FID, i.e. the 9 th subframe and the 5 th subframe, is 4T_sfOptionally, the correspondence between the first time interval and the second time interval and the ratio of the uplink subframe to the downlink subframe of the system may be configured in advance to the UE. The preconfigured uplink and downlink subframe proportioning relationship may include that the first time interval is 4T_sfThe second time interval is 4T_sfThen, the uplink and downlink subframe ratio of the corresponding system is 3:2, and the UE can obtain the first time interval of 4T_sfThe second time interval is 4T_sfAnd then, according to the pre-configured uplink and downlink subframe ratio relationship, determining that the uplink and downlink subframe ratio of the system is 3: 2. The determining module 610 may control the positions of the PSS, SSS, and FID transmission subframes in a frame, so that the first time interval and the second time interval are not all the same as the two values in other uplink and downlink subframe configurations.

Therefore, the base station of the embodiment of the invention can enable the UE to determine the ratio of the uplink subframe and the downlink subframe of the system in advance by controlling the positions of the PSS, the SSS and the FID in the frame without determining the ratio of the uplink subframe and the downlink subframe of the system through SIB information, and further can adopt a corresponding sleep strategy to reduce power consumption according to the ratio of the uplink subframe and the downlink subframe of the system.

Optionally, in this embodiment of the present invention, the determining module 610 is specifically configured to:

The determination module 610 passes controlMaking positions of sending subframes of the PSS, SSS, and FID in a frame, so that the UE can determine uplink and downlink subframe ratios of the system according to the obtained first and second time intervals, optionally, after obtaining the first and second time intervals, the UE may convert the first and second time intervals into ratios a and B of subframe durations, and under the different uplink and downlink subframe ratios, A, B determined by the UE according to the obtained first and second time intervals and the uplink and downlink subframe ratios of the system exist in a corresponding relationship in table 2, for example, if the first time interval obtained by the UE is 4T_sfThe second time interval is 4T_sfObtaining the ratio of the first time interval and the second time interval to the subframe duration to obtain a ═ 4, B ═ 4, and substituting the corresponding relationship in table 2 can know a₂＝4，B₂If it is 4, the ratio of uplink and downlink subframes of the system is the group a₂，B₂Corresponding to C₂:D₂＝3:2。

The base station 600 according to the embodiment of the present invention may correspond to the base station in the communication method 5000 of the TDD based M2D system according to the embodiment of the present invention, and the above and other operations and/or functions of each module in the base station 600 are respectively for implementing corresponding processes of each aforementioned method, and are not described herein again for brevity.

In addition, as shown in fig. 10, an embodiment of the present invention further provides a communication system 700, where the communication system 700 includes the user equipment 500 according to the embodiment of the present invention and the base station 600 according to the embodiment of the present invention. The UE 500 according to the embodiment of the present invention may correspond to the UE in the communication method 1000 of the TDD-based M2M system according to the embodiment of the present invention, and the above and other operations and/or functions of each module in the UE 500 are respectively for implementing corresponding processes of the foregoing methods, and are not described herein again for brevity; the base station 600 according to the embodiment of the present invention may correspond to the base station in the communication method 5000 of the TDD based M2D system according to the embodiment of the present invention, and the above and other operations and/or functions of each module in the base station 600 are respectively for implementing corresponding processes of each aforementioned method, and are not described herein again for brevity.

As shown in fig. 11, an embodiment of the present invention further provides a user equipment 800, where the user equipment 800 includes a processor 810, a memory 820, a bus system 830, and a transceiver 840. The processor 810, the memory 820 and the transceiver 840 are connected via the bus system 830, the memory 820 is used for storing instructions, and the processor 810 is used for executing the instructions stored in the memory 820 to control the transceiver 840 to receive signals or transmit signals. The transceiver 840 is configured to receive a primary synchronization signal PSS, a secondary synchronization signal SSS, and a frame number FID sent by a base station; the processor 810 is configured to obtain a first time interval from successful receiving of the PSS to successful receiving of the SSS and a second time interval from successful receiving of the SSS to successful receiving of the FID; the processor 810 is further configured to determine an uplink and downlink subframe ratio of the system according to the first time interval and the second time interval.

It should be understood that, in the embodiment of the present invention, the processor 810 may be a Central Processing Unit (CPU), and the processor 810 may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory 820 may include both read-only memory and random access memory, and provides instructions and data to the processor 810. A portion of the memory 820 may also include non-volatile random access memory. For example, memory 820 may also store device type information.

The bus system 830 may include a power bus, a control bus, a status signal bus, and the like, in addition to a data bus. For clarity of illustration, however, the various buses are designated in the figure as the bus system 830.

In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 810. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 820, and the processor 810 reads the information in the memory 820 and combines the hardware to complete the steps of the above method. To avoid repetition, it is not described in detail here.

Optionally, in an embodiment of the present invention, the processor 810 is specifically configured to:

Optionally, in an embodiment of the present invention, the processor 810 is further configured to:

if the T is_FSIf the time length of the superframe is not more than the time length of the superframe preset by the system, the T is set_FSAnd the T_sfThe ratio of (A) to (B) is determined as B;

and after determining the ratio of the uplink subframe to the downlink subframe of the system, determining the uplink subframe so that the subframe which does not send information in the uplink subframe is dormant by the user equipment.

As shown in fig. 12, the embodiment of the present invention further provides a base station 900, where the base station 900 includes a processor 910, a memory 920, a bus system 930, and a transceiver 940. The processor 910, the memory 920 and the transceiver 940 are connected via a bus system 930, the memory 920 is used for storing instructions, and the processor 910 is used for executing the instructions stored in the memory 920 to control the transceiver 940 to receive signals or transmit signals. Wherein, the processor 910 is configured to determine, according to a frame structure preset by the system, positions of transmission subframes of a primary synchronization signal PSS, a secondary synchronization signal SSS, and a frame number FID in a frame; the transceiver 940 is configured to transmit, to a user equipment UE, the PSS, the SSS, and the FID at positions of transmission subframes of the PSS, the SSS, and the FID in the frame, respectively, so that the UE determines an uplink and downlink subframe ratio of the system according to a first time interval and a second time interval, the first time interval being determined by positions of the transmission subframes of the PSS and the SSS in the frame, and the second time interval being determined by positions of the transmission subframes of the SSS and the FID in the frame.

It should be understood that, in the embodiment of the present invention, the processor 910 may be a Central Processing Unit (CPU), and the processor 910 may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory 920 may include a read-only memory and a random access memory, and provides instructions and data to the processor 910. A portion of the memory 920 may also include non-volatile random access memory. For example, the memory 920 may also store device type information.

The bus system 930 may include a power bus, a control bus, a status signal bus, and the like, in addition to a data bus. For clarity of illustration, however, the various buses are designated in the figure as the bus system 930.

In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 910. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 920, and the processor 910 reads the information in the memory 920 and performs the steps of the above method in combination with the hardware thereof. To avoid repetition, it is not described in detail here.

Optionally, in this embodiment of the present invention, the processor 910 is specifically configured to:

It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It should be understood that, in various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A communication method of a machine-to-machine M2M system based on Time Division Duplex (TDD), the communication method comprising:

the user equipment acquires a first time interval from successful receiving of the PSS to successful receiving of the SSS and a second time interval from successful receiving of the SSS to successful receiving of the FID;

2. The communication method according to claim 1, wherein the determining, by the ue, the uplink and downlink subframe ratio of the system according to the first time interval and the second time interval includes:

the preset uplink and downlink subframe proportioning relationship comprises: a. the_i，B_iThe ratio of uplink and downlink subframes of the corresponding system is C_i:D_i(ii) a Wherein, A is_iThe B_iThe C is_iD the above_iAnd i is a positive integer, A is A_iA specific value of (A), said B is said B_iA specific value of (a).

3. The communication method according to claim 2, wherein said obtaining the duration T of the second time interval_FSFor sub-frame duration T_sfThe multiple B of (a) includes:

if said T is_FSIf the time length of the superframe is not more than the time length of the superframe preset by the system, the T is set_FSAnd said T_sfThe ratio of (B) is determined as said B.

4. The communication method according to claim 2, wherein said obtaining the duration T of the second time interval_FSFor sub-frame duration T_sfThe multiple B of (a) includes:

if said T is_FSIf the time length of the superframe is greater than the time length of the superframe preset by the system, the T is set_FSObtaining T 'by performing mold extraction on the time length of the superframe'_FSPrepared from the above T'_FSAnd said T_sfThe ratio of (B) is determined as said B.

5. The communication method according to any one of claims 2 to 4, said A_i，B_iThe ratio of uplink and downlink subframes of the corresponding system is C_i:D_iThe method comprises the following steps:

6. The communication method according to any one of claims 1 to 4, characterized in that the communication method further comprises:

7. A communication method of a machine-to-machine M2M system based on Time Division Duplex (TDD), the communication method comprising:

the base station determines the positions of the sending subframes of the primary synchronization signal PSS, the secondary synchronization signal SSS and the frame number FID in the frame according to the frame structure preset by the system;

the base station respectively transmits the PSS, the SSS and the FID to User Equipment (UE) at the positions of the transmitting subframes of the PSS, the SSS and the FID in the frame, so that the UE determines the uplink and downlink subframe ratio of the system according to a first time interval and a second time interval, wherein the first time interval is determined by the positions of the transmitting subframes of the PSS and the SSS in the frame, and the second time interval is determined by the positions of the transmitting subframes of the SSS and the FID in the frame.

8. The communication method according to claim 7, wherein the base station determines the positions of the transmission subframes of the primary synchronization signal PSS, the secondary synchronization signal SSS and the FID in the frame according to the frame structure preset by the system, and comprises:

if the ratio of uplink subframes to downlink subframes of a frame structure preset by the system is 2:3, determining that the PSS is sent at a subframe 0 and a subframe 1 of a frame, the SSS is sent at a subframe 5 and a subframe 6 of the frame, and the FID is sent at a subframe 0 of the next frame of the frame, wherein the frame comprises 10 subframes; or,

if the ratio of uplink subframes to downlink subframes of a frame structure preset by the system is 3:2, determining that the PSS is sent at a subframe 0 and a subframe 1 of the frame, the SSS is sent at a subframe 4 and a subframe 5 of the frame, and the FID is sent at a subframe 9 of the frame, wherein the frame comprises 10 subframes; or,

if the ratio of uplink subframes to downlink subframes of a frame structure preset by the system is 4:1, determining that the PSS is sent on a subframe 0 and a subframe 1 of the frame, the SSS is sent on a subframe 3 and a subframe 4 of the frame, and the FID is sent on a subframe 8 of the frame, wherein the frame comprises 10 subframes; or,

if the ratio of uplink subframes to downlink subframes of a frame structure preset by the system is 5:5, determining that the PSS is sent in a subframe No. 0 and a subframe No. 1 of a frame, the SSS is sent in a subframe No. 5 and a subframe No. 6 of the frame, and the FID is sent in a subframe No. 9 of the frame, wherein the frame comprises 10 subframes; or,

if the ratio of uplink subframes to downlink subframes of a frame structure preset by the system is 7:3, determining that the PSS is sent in a subframe No. 0 and a subframe No. 1 of a frame, the SSS is sent in a subframe No. 5 and a subframe No. 6 of the frame, and the FID is sent in a subframe No. 7 of the frame, wherein the frame comprises 10 subframes; or,

if the ratio of uplink subframes to downlink subframes of a frame structure preset by the system is 8:2, determining that the PSS is sent in a subframe No. 0 and a subframe No. 1 of a frame, the SSS is sent in a subframe No. 4 and a subframe No. 5 of the frame, and the FID is sent in a subframe No. 6 of the frame, wherein the frame comprises 10 subframes; or,

if the ratio of uplink subframes to downlink subframes of a frame structure preset by the system is 9:1, it is determined that the PSS is sent in the subframe No. 0 and the subframe No. 1 of the frame, the SSS is sent in the subframe No. 3 and the subframe No. 4 of the frame, and the FID is sent in the subframe No. 5 of the frame, wherein the frame comprises 10 subframes.

9. A user device, comprising:

an obtaining module, configured to obtain a first time interval from a time when the receiving module successfully receives the PSS to a time when the SSS is successfully received, and a second time interval from a time when the SSS is successfully received to a time when the FID is successfully received;

a determining module, configured to determine, according to the first time interval and the second time interval obtained by the obtaining module, an uplink and downlink subframe ratio of a machine-to-machine M2M system based on TDD.

10. The user equipment of claim 9, wherein the determining module comprises:

a second obtaining unit, configured to obtain a duration T of the second time interval_FSFor the subframe duration T_sfA multiple of B;

11. The ue of claim 10, wherein the second obtaining unit is specifically configured to:

12. The ue of claim 10, wherein the second obtaining unit is further configured to:

13. The user equipment of any of claims 10 to 12, the a_i，B_iThe ratio of uplink and downlink subframes of the corresponding system is C_i:D_iThe method comprises the following steps:

14. The user equipment according to any one of claims 9 to 12, further comprising:

and the dormancy module is used for determining the uplink subframe after the determining module determines the proportion of the uplink subframe and the downlink subframe of the system, so that the user equipment sleeps in the subframe which does not send information in the uplink subframe.

15. A base station, comprising:

the device comprises a determining module, a processing module and a processing module, wherein the determining module is used for determining the positions of sending subframes of a primary synchronization signal PSS, a secondary synchronization signal SSS and a frame number FID in a frame according to a frame structure preset by a machine-to-machine M2M system based on time division duplex TDD;

and a sending module, configured to send, to a user equipment UE, the PSS, the SSS, and the FID at positions of transmission subframes of the PSS, the SSS, and the FID in the frame, respectively, so that the UE determines an uplink and downlink subframe ratio of the system according to a first time interval and a second time interval, where the first time interval is determined by positions of the transmission subframes of the PSS and the SSS in the frame, and the second time interval is determined by positions of the transmission subframes of the SSS and the FID in the frame.

16. The base station of claim 15, wherein the determining module is specifically configured to:

17. A communication system comprising a user equipment according to any of claims 9 to 14 and a base station according to claim 15 or 16.