CN103391264B

CN103391264B - Method and device for identifying carrier wave type

Info

Publication number: CN103391264B
Application number: CN201210140946.9A
Authority: CN
Inventors: 高雪娟; 潘学明
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2012-05-08
Filing date: 2012-05-08
Publication date: 2017-04-19
Anticipated expiration: 2032-05-08
Also published as: CN103391264A; WO2013166961A1

Abstract

The invention discloses a method and device for identifying a carrier wave type and relates to the technical field of wireless communication. The method and device are used for solving the problem how to indentify the carrier wave type by a terminal. According to the embodiment, the terminal can determine the type of a current carrier wave according to the position relation between the resource where a detected synchronous signal on the current carrier wave is located and the resource where a detected PBCH is located, or according to the PBCH detected on the current carrier wave, or according to the position relation between the resource where the synchronous signal detected on the current carrier wave is located and the resource where a detected CRS is located, or according to a transmission subframe of the CRS on the current carrier wave, or according to a frequency domain resource used for transmitting the synchronous signal detected on the current carrier wave. Therefore, the problem how to identify the type of the carrier wave by the terminal is solved.

Description

Carrier type identification method and device

Technical Field

The present invention relates to the field of wireless communications, and in particular, to a method and an apparatus for identifying a carrier type.

Background

In a Long Term Evolution-Advanced (LTE-a) system, the peak rate of the system is greatly improved compared with that of a Long Term Evolution (LTE) system, and the system is required to reach 1Gbps downlink and 500Mbps uplink. Therefore, the LTE-a system needs to extend the available bandwidth of the terminal, i.e. to aggregate multiple continuous or discontinuous carriers under the same base station (eNB) and serve User Equipment (UE) to provide the required rate, as shown in fig. 1. These aggregated carriers are also called Component Carriers (CCs). Each cell may be a component carrier, and cells (component carriers) under different enbs cannot be aggregated. In order to ensure that the UE in the LTE system can operate on each aggregated carrier, each carrier does not exceed 20MHz at maximum.

Downlink Reference Signals in the LTE-a system mainly include Cell-specific Reference Signals (CRS), Downlink user-specific Reference Signals (URS, also called Downlink or Dedicated Reference Signals (DRS)), Positioning Reference Signals (PRS), and Channel state information Reference Signals (CSI-RS).

The CRS supports transmission of 1, 2, and 4 antenna ports, and is mainly used for data demodulation of a downlink channel, transmission exists in each downlink subframe, and a mapping manner in one Physical Resource Block (PRB) is as shown in fig. 2a and 2b, where fig. 2a is a mapping manner under a conventional Cyclic Prefix (CP), and fig. 2b is a mapping manner under an extended CP. CRS is generated based on a pseudo-random sequence c (i) as shown in equation (1), c (i) at each Orthogonal Frequency Division Multiplexing (OFDM) symbol based on a slot number n_sOFDM symbol number l, cell identificationAnd a parameter N related to cyclic prefix type_CPInitialization is performed, that is, the CRS sequence transmitted on each OFDM symbol is different, as shown in formula (2). CRS (common reference signal) sequence corresponding to 1 OFDM (orthogonal frequency division multiplexing) symbol based on maximum bandwidth(generally 20MHz, 110PRB in Physical Resource Block (PRB)) in 1 antenna port, and a single antenna port includes 2 CRS symbols in one PRB on one OFDM symbol, so the sequence length of CRS generation is 20MHzThe CRS sequence is mapped to each PRB in the maximum bandwidth according to the maximum bandwidth, and if the current downlink system bandwidth is smaller than the maximum bandwidth, the CRS sequence is actually used, namely the CRS in the PRB corresponding to the current downlink system bandwidth mapped to the center of the maximum bandwidth.

Wherein,

the DRS supports transmission of 1-8 antenna ports and is only sent on the PRB where the downlink data adopting the transmission modes of 7-9 are located. Release 10 (Rel-10) specifies that, in PRBs in which resources overlap between a DRS and a Physical Broadcast Channel (PBCH) or a synchronization signal in the same subframe, the DRS is not transmitted, and therefore, downlink data demodulated by the DRS cannot be transmitted but downlink data demodulated by the CRS can be transmitted in these PRBs.

The cell search is the first step of accessing the UE to a cell, and through this process, the UE can obtain downlink synchronization with the accessed cell, obtain cell identification information (cell ID) and cell-related configuration information, so as to ensure normal operation of the UE in the cell. The cell search mainly includes synchronization signal detection and PBCH reception.

The Synchronization signals include Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS), which are used for performing downlink timing, finding a wireless frame start position, and receiving and transmitting data. The PSS and SSS are transmitted on only the 72 subcarriers in the center of the cell band (actually occupying 62 subcarriers, with the remaining subcarriers used as guard intervals). For frame structure type 1, a frame structure of a Frequency Division Duplex (FDD) system, PSS and SSS are transmitted on the last and second to last OFDM symbols of slots 0 and 10, respectively; for frame structure type 2, i.e. a frame structure of a Time Division Duplex (TDD) system, PSS is transmitted on the third OFDM symbols of subframes 1 and 6, where subframe 1 is a special subframe including a Downlink Pilot Time Slot (DwPTS), a Guard Time (GP), and an Uplink Pilot Time Slot (UpPTS), subframe 6 is a special subframe only in TDD Uplink/Downlink configuration of a 5 Millisecond (Millisecond, ms) Downlink-Uplink switching point, SSS is transmitted on the last OFDM symbol of timeslots 1 and 11, as shown in fig. 3a and 3b, fig. 3a is a resource mapping schematic diagram of a synchronization signal of the TDD system, and fig. 3b is a resource mapping schematic diagram of a synchronization signal of the TDD system.

The PBCH is used for carrying a Master Information Block (MIB), and mainly carries: a downlink System bandwidth, a Physical hybrid automatic repeat request indicator Channel (PHICH) configuration, and a System Frame Number (SFN) of the cell. In addition, different scrambling sequences used by Cyclic Redundancy Check (CRC) information of PBCH indicate the CRS antenna port number of the base station. The UE may obtain the number of antenna ports by blindly detecting a scrambling sequence of the CRC of the PBCH. Channels such as a Physical Downlink Control Channel (PDCCH), a PHICH, and a Physical Control format Indicator Channel (PCIFCH) are all transmitted using the CRS antenna port number. The PBCH is updated at a period of 40ms, and is transmitted on the first four OFDM symbols of the 2 nd slot (i.e. slot 1) of the subframe 0 of each of the 4 consecutive radio frames, and the 72 subcarriers occupying the center of the carrier frequency band are fixed in the frequency domain, as shown in fig. 4a and 4b, where fig. 4a is a mapping manner under the conventional CP, and fig. 4b is a mapping manner under the extended CP.

In order to further improve the utilization rate of system resources, release 11 (Rel-11) of the LTE-a system determines to introduce a New Carrier Type (NCT) to enhance the utilization rate of the system spectrum, better support heterogeneous networks, and reduce power consumption. The NCT carrier supports only single antenna port (antenna port 0) CRS transmission with 5ms period, and the CRS is not used for downlink data demodulation. The NCT carrier in Rel-11 cannot work independently, and needs to work together with a legacy (legacy) carrier. According to whether a receiving end has certain deviation with a legacy carrier in a time domain and a frequency domain, the receiving end is divided into a synchronous carrier and an asynchronous carrier, and the asynchronous carrier needs to be subjected to independent time-frequency synchronization processing, so that a synchronous signal needs to be transmitted on an NCT carrier. Considering that downlink data on the NCT carrier needs to be demodulated based on the DRS, and a synchronization signal on the legacy carrier and the DRS have resource overlap, in order to improve downlink transmission efficiency of the NCT carrier, a new synchronization signal transmission time domain position needs to be designed to avoid resource overlap with downlink reference signals such as the CRS and the DRS. In addition, in Rel-12 and subsequent releases, NCT carriers may also work independently, so PBCH needs to be transmitted as well, and PBCH transmission should also avoid overlapping with resources of downlink reference signals such as CRS and DRS.

The transmission resource of the synchronization signal on the NCT carrier is different from that of the legacy carrier, and when the UE cannot determine whether the access carrier is the NCT carrier or the legacy carrier, the UE cannot obtain correct synchronization signal data, and thus cannot correctly receive the PBCH, and cannot implement a normal cell search process.

Disclosure of Invention

The embodiment of the invention provides a carrier type identification method and carrier type identification equipment, which are used for solving the problem of how to identify the carrier type by a terminal.

A method for identifying a carrier type, the method comprising:

the terminal detects a synchronous signal on a current carrier wave and detects a physical broadcast channel PBCH according to the detected synchronous signal;

and the terminal determines the carrier type of the current carrier according to the position relation between the detected resource of the synchronization signal and the detected resource of the PBCH or according to the detected PBCH.

A method for identifying a carrier type, the method comprising:

the terminal detects a synchronous signal on a current carrier wave and detects a cell exclusive reference signal CRS according to the detected synchronous signal;

and the terminal determines the carrier type of the current carrier according to the position relation between the detected resource of the synchronous signal and the detected resource of the CRS, or the detected transmission subframe of the CRS.

A method for identifying a carrier type, the method comprising:

the terminal detects a synchronous signal on a current carrier wave;

and the terminal determines the carrier type of the current carrier according to the detected frequency domain resource used by the transmission of the synchronous signal.

A terminal, the terminal comprising:

a detection unit, configured to detect a synchronization signal on a current carrier, and detect a physical broadcast channel PBCH according to the detected synchronization signal;

and the identification unit is used for determining the carrier type of the current carrier according to the position relationship between the detected resource of the synchronization signal and the detected resource of the PBCH or according to the detected PBCH.

A terminal, the terminal comprising:

the detection unit is used for detecting a synchronous signal on the current carrier and detecting a cell-specific reference signal CRS according to the detected synchronous signal;

and the identification unit is used for determining the carrier type of the current carrier according to the position relationship between the detected resource of the synchronization signal and the detected resource of the CRS, or the transmission subframe of the detected CRS.

A terminal, the terminal comprising:

a detection unit for detecting a synchronization signal on a current carrier;

and the identification unit is used for determining the carrier type of the current carrier according to the detected frequency domain resource used by the transmission of the synchronous signal.

In the scheme, the terminal may determine the carrier type of the current carrier according to the position relationship between the resource where the synchronization signal detected on the current carrier is located and the resource where the detected PBCH is located, or according to the PBCH detected on the current carrier, or according to the position relationship between the resource where the synchronization signal detected on the current carrier is located and the resource where the detected CRS is located, or according to the transmission subframe of the detected CRS on the current carrier, or according to the frequency domain resource used for transmission of the synchronization signal detected on the current carrier, thereby solving the problem of how to identify the carrier type by the terminal.

Drawings

Fig. 1 is a schematic diagram of carrier aggregation in the prior art;

fig. 2a is a schematic resource mapping diagram of a CRS under a conventional CP in the prior art;

fig. 2b is a schematic diagram of resource mapping of CRS under an extended CP in the prior art;

fig. 3a is a schematic resource mapping diagram of a synchronization signal in an FDD system in the prior art;

FIG. 3b is a schematic diagram illustrating resource mapping of a synchronization signal in a TDD system according to the prior art;

fig. 4a is a schematic diagram of resource mapping of PBCH under a conventional CP in the prior art;

fig. 4b is a schematic diagram of resource mapping of PBCH under an extended CP in the prior art;

FIG. 5 is a schematic flow chart of a method provided by an embodiment of the present invention;

FIG. 6 is a schematic flow chart of another method provided by the embodiments of the present invention;

FIG. 7 is a schematic flow chart of another method provided by the embodiments of the present invention;

fig. 8 is a schematic structural diagram of an apparatus according to an embodiment of the present invention.

Detailed Description

In order to solve the problem how a terminal identifies a carrier type, an embodiment of the present invention provides a first method for identifying a carrier type.

Referring to fig. 5, a method for identifying a first carrier type according to an embodiment of the present invention includes the following steps:

step 50: the terminal detects a synchronous signal on a current carrier wave and detects PBCH according to the detected synchronous signal;

step 51: and the terminal determines the carrier type of the current carrier according to the position relation between the detected resource of the synchronization signal and the detected resource of the PBCH or according to the detected PBCH.

Specifically, in step 51, the terminal determines the carrier type of the current carrier according to the position relationship between the detected resource where the synchronization signal is located and the detected resource where the PBCH is located, and the specific implementation may adopt one of the following methods:

the method comprises the steps that a terminal determines the carrier type of a current carrier according to the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols spaced on a time domain by a detected synchronization signal and a detected PBCH;

here, the synchronization signal includes PSS and/or SSS.

For frame structure type 1, the terminal determines the carrier type of the current carrier according to the number of OFDM symbols spaced in the time domain by the detected synchronization signal and the detected PBCH, and the specific implementation may be as follows:

if the k-1 OFDM symbols are spaced in the time domain by the detected OFDM symbol where the PSS is located and the detected Kth OFDM symbol in the OFDM symbol where the PBCH is located, determining that the current carrier is the first type of carrier; otherwise, determining the current carrier as a second type carrier; or,

if k OFDM symbols are spaced in the time domain by the detected OFDM symbol where the SSS is located and the detected kth OFDM symbol in the OFDM symbol where the PBCH is located, determining that the current carrier is the first type of carrier; otherwise, determining the current carrier as a second type carrier; or,

if k-1 OFDM symbols are spaced in the time domain by the detected OFDM symbol in which the PSS is located and the detected kth OFDM symbol in the OFDM symbol in which the PBCH is located, and k OFDM symbols are spaced in the time domain by the detected OFDM symbol in which the SSS is located and the detected kth OFDM symbol in the OFDM symbol in which the PBCH is located, determining that the current carrier is the first type carrier; otherwise, determining the current carrier as a second type carrier;

and K is more than or equal to 1 and less than or equal to K, wherein K is the number of the OFDM symbols in which PBCH is transmitted on the first type carrier. Preferably, K = 4.

For frame structure type 2, the terminal determines the carrier type of the current carrier according to the number of OFDM symbols spaced in the time domain by the detected synchronization signal and the detected PBCH, and the specific implementation may be as follows:

if K-K + A OFDM symbols are spaced in the time domain by the detected OFDM symbol where the PSS is located and the detected kth OFDM symbol in the OFDM symbol where the PBCH is located, determining that the current carrier is the first type of carrier; otherwise, determining the current carrier as a second type carrier; or,

if K-K + B OFDM symbols are spaced in the time domain by the detected OFDM symbol where the SSS is located and the detected kth OFDM symbol in the OFDM symbol where the PBCH is located, determining that the current carrier is the first type of carrier; otherwise, determining the current carrier as a second type carrier; or,

if K-K + A OFDM symbols are spaced in the time domain by the detected OFDM symbol where the PSS is located and the detected kth OFDM symbol in the OFDM symbol where the PBCH is located, and K-K + B OFDM symbols are spaced in the time domain by the detected OFDM symbol where the SSS is located and the detected kth OFDM symbol in the OFDM symbol where the PBCH is located, determining that the current carrier is the first type of carrier; otherwise, determining the current carrier as a second type carrier;

k is more than or equal to 1 and less than or equal to K, and K is the number of OFDM symbols in which PBCH is transmitted on the first type carrier; under normal Cyclic Prefix (CP), a =5, B =2, and under extended CP, a =4, B = 1. Preferably, K = 4. The terminal determines the type of the CP according to the detected synchronization signal (the specific action may be to determine the CP type by a blind detection method).

Determining the carrier type of the current carrier according to the detected synchronization signal and the detected PBCH, the transmission sequence in the time domain, the position relation of the time slot or the position relation of the subframe;

here, the synchronization signal includes PSS and/or SSS.

For frame structure type 1, the terminal determines the carrier type of the current carrier according to the transmission sequence of the detected synchronization signal and the detected PBCH in the time domain, the position relationship of the time slot where the synchronization signal is located, or the position relationship of the subframe where the synchronization signal is located, and the specific implementation may be as follows:

if the transmission sequence of the detected OFDM symbol where the PSS is located and the detected OFDM symbol where the PBCH is located on the time domain or the position relation of the detected time slot or the position relation of the detected subframe meet a first condition, determining that the current carrier is a first type carrier; otherwise, determining the current carrier as a second type carrier; or,

if the transmission sequence of the detected OFDM symbol where the SSS is located and the detected OFDM symbol where the PBCH is located on the time domain, the position relation of the detected time slot or the position relation of the detected subframe meets a second condition, determining that the current carrier is a first type carrier; otherwise, determining the current carrier as a second type carrier; or,

if the transmission sequence of the detected OFDM symbol where the PSS is located and the detected OFDM symbol where the PBCH is located in the time domain, the position relation of the detected time slot or the position relation of the detected subframe meet a first condition, and the transmission sequence of the detected OFDM symbol where the SSS is located and the detected OFDM symbol where the PBCH is located in the time domain, the position relation of the detected time slot or the position relation of the detected subframe meet a second condition, determining that the current carrier is a first type carrier; otherwise, determining the current carrier as the second type carrier.

The first condition includes: the detected OFDM symbol where the PSS is located exceeds the detected OFDM symbol where the PBCH is located in the time domain; or,

the detected OFDM symbol where the PSS is located and the detected OFDM symbol where the PBCH is located are in the same subframe or different time slots of the same subframe;

or the detected OFDM symbol of the PSS and the detected OFDM symbol of the PBCH are in the same subframe, and the time domain of the detected OFDM symbol of the PSS is ahead of the time domain of the detected OFDM symbol of the PBCH;

or the detected OFDM symbol of the PSS and the detected OFDM symbol of the PBCH are in the same subframe, the detected OFDM symbol of the PSS is in the first time slot of the subframe, and the detected OFDM symbol of the PBCH is in the second time slot of the subframe.

The second condition includes: the detected OFDM symbol where the SSS is located exceeds the detected OFDM symbol where the PBCH is located in the time domain; or,

the detected OFDM symbol where the SSS is located and the detected OFDM symbol where the PBCH is located are in the same subframe or different time slots of the same subframe; or,

the detected OFDM symbol where the SSS is located and the detected OFDM symbol where the PBCH is located are in the same subframe, and the time domain of the detected OFDM symbol where the SSS is located exceeds that of the detected OFDM symbol where the PBCH is located; or,

the detected OFDM symbol where the SSS is located and the detected OFDM symbol where the PBCH is located are in the same subframe, the detected OFDM symbol where the SSS is located is in a first time slot of the subframe, and the detected OFDM symbol where the PBCH is located is in a second time slot of the subframe.

For example, the following combination description is given for each sub-condition combination case in the above-described first condition and/or second condition, without excluding other combination cases:

if the detected OFDM symbol where the PSS is located exceeds the detected OFDM symbol where the PBCH is located in the time domain, or the detected OFDM symbol where the PSS is located and the detected OFDM symbol where the PBCH is located are in the same subframe or different time slots of the same subframe, or the detected OFDM symbol where the PSS is located and the detected OFDM symbol where the PBCH is located are in the same subframe and the detected OFDM symbol where the PSS is located exceeds the detected OFDM symbol where the PBCH is located in the time domain, or the detected OFDM symbol where the PSS is located and the detected OFDM symbol where the PBCH is located are in the same subframe and the detected OFDM symbol where the PSS is located is in a first time slot of the subframe and the detected OFDM symbol where the PBCH is located is in a second time slot of the subframe, determining that the current carrier is a first type carrier; otherwise, determining the current carrier as a second type carrier; or,

if the detected OFDM symbol where the SSS is located exceeds the detected OFDM symbol where the PBCH is located in the time domain, or the detected OFDM symbol where the SSS is located and the detected OFDM symbol where the PBCH is located are in the same subframe or different time slots of the same subframe, or the detected OFDM symbol where the SSS is located and the detected OFDM symbol where the PBCH is located are in the same subframe and the detected OFDM symbol where the SSS is located exceeds the detected OFDM symbol where the PBCH is located in the time domain, or the detected OFDM symbol where the SSS is located and the detected OFDM symbol where the PBCH is located are in the same subframe and the detected OFDM symbol where the SSS is located is in the first time slot of the subframe and the detected OFDM symbol where the PBCH is located is in the second time slot of the subframe, determining that the current carrier is the first type of carrier; otherwise, determining the current carrier as a second type carrier; or,

if the detected OFDM symbol where the PSS is located exceeds the detected OFDM symbol where the PBCH is located in the time domain, and the detected OFDM symbol where the SSS is located exceeds the detected OFDM symbol where the PBCH is located in the time domain, determining that the current carrier is a first type carrier; otherwise, determining the current carrier as a second type carrier; or,

if the detected OFDM symbol of the PSS and the detected OFDM symbol of the PBCH are in different time slots of the same subframe or the same subframe, and the detected OFDM symbol of the SSS and the detected OFDM symbol of the PBCH are in different time slots of the same subframe or the same subframe, determining that the current carrier is a first type of carrier; otherwise, determining the current carrier as a second type carrier; or,

if the detected OFDM symbols of the PSS and the SSS are in the same subframe with the detected OFDM symbols of the PBCH, and the detected OFDM symbols of the PSS and the SSS are ahead of the detected OFDM symbols of the PBCH, determining that the current carrier is the first type of carrier; otherwise, determining the current carrier as a second type carrier; or,

if the detected OFDM symbols of the PSS and the SSS are in the same subframe as the detected OFDM symbols of the PBCH, the detected OFDM symbols of the PSS and the SSS are in the first time slot of the subframe, and the detected OFDM symbols of the PBCH are in the second time slot of the subframe, determining that the current carrier is the first type of carrier; otherwise, determining the current carrier as the second type carrier.

For frame structure type 2, the terminal determines the carrier type of the current carrier according to the transmission sequence of the detected synchronization signal and the detected PBCH in the time domain, the position relationship of the time slot where the synchronization signal is located, or the position relationship of the subframe where the synchronization signal is located, and the specific implementation may be as follows:

if the transmission sequence of the detected OFDM symbol where the PSS is located and the detected OFDM symbol where the PBCH is located on the time domain or the position relation of the detected time slot or the position relation of the detected subframe meet a third condition, determining that the current carrier is a first type carrier; otherwise, determining the current carrier as a second type carrier; or,

if the transmission sequence of the detected OFDM symbol where the SSS is located and the detected OFDM symbol where the PBCH is located on the time domain, the position relation of the detected time slot or the position relation of the detected subframe meets a fourth condition, determining that the current carrier is a first type carrier; otherwise, determining the current carrier as a second type carrier; or,

if the transmission sequence of the detected OFDM symbol in which the PSS is located and the detected OFDM symbol in which the PBCH is located in the time domain, the position relation of the detected time slot or the position relation of the detected subframe meet a third condition, and the transmission sequence of the detected OFDM symbol in which the SSS is located and the detected OFDM symbol in which the PBCH is located in the time domain, the position relation of the detected time slot or the position relation of the detected subframe meet a fourth condition, determining that the current carrier is a first type carrier; otherwise, determining the current carrier as the second type carrier.

The third condition includes: the detected OFDM symbol where the PSS is located lags behind the detected OFDM symbol where the PBCH is located in the time domain;

or the detected OFDM symbol of the PSS and the detected OFDM symbol of the PBCH are in different time slots of adjacent subframes or adjacent subframes; or,

the detected OFDM symbol where the PSS is located and the detected OFDM symbol where the PBCH is located are in adjacent subframes, and the time domain of the detected OFDM symbol where the PSS is located lags behind the time domain of the detected OFDM symbol where the PBCH is located; or,

the detected OFDM symbol of the PSS and the detected OFDM symbol of the PBCH are in adjacent subframes, the detected OFDM symbol of the PSS is positioned in a first time slot of a next subframe, and the detected OFDM symbol of the PBCH is positioned in a second time slot of a previous subframe;

the fourth condition includes: the OFDM symbol where the SSS is detected lags behind the OFDM symbol where the PBCH is detected in the time domain; or,

the detected OFDM symbol where the SSS is located and the detected OFDM symbol where the PBCH is located are in the same subframe or the same time slot of the same subframe; or,

the detected OFDM symbol where the SSS is located and the detected OFDM symbol where the PBCH is located are in the same subframe, and the OFDM symbol where the SSS is located lags behind the OFDM symbol where the PBCH is located in the time domain; or,

the detected OFDM symbol where the SSS is located and the detected OFDM symbol where the PBCH is located are in the same time slot of the same subframe, and the OFDM symbol where the SSS is located lags behind the OFDM symbol where the PBCH is located in the time domain; or,

the detected OFDM symbol where the SSS is located and the detected OFDM symbol where the PBCH is located are in a second time slot of the same subframe, and the OFDM symbol where the SSS is located lags behind the OFDM symbol where the PBCH is located in a time domain.

For example, the following combination description is given for each sub-condition combination case in the above-described third condition and/or fourth condition, without excluding other combination cases:

if the detected OFDM symbol where the PSS is located lags behind the detected OFDM symbol where the PBCH is located in the time domain, or the detected OFDM symbol where the PSS is located and the detected OFDM symbol where the PBCH is located are in different time slots of an adjacent subframe or an adjacent subframe, or the detected OFDM symbol where the PSS is located and the detected OFDM symbol where the PBCH is located are in an adjacent subframe and the detected OFDM symbol where the PSS is located lags behind the detected OFDM symbol where the PBCH is located in the time domain, or the detected OFDM symbol where the PSS is located and the detected OFDM symbol where the PBCH is located in an adjacent subframe and the detected OFDM symbol where the PBCH is located in a first time slot of a next subframe and the detected OFDM symbol where the PBCH is located in a second time slot of a previous subframe, determining that the current carrier is a first type carrier; otherwise, determining the current carrier as a second type carrier; or,

if the detected OFDM symbol in which the SSS is located lags behind the detected OFDM symbol in which the PBCH is located in the time domain, or the detected OFDM symbol of SSS and the detected OFDM symbol of PBCH are in the same subframe or the same time slot of the same subframe, or the detected OFDM symbol where the SSS is located is in the same subframe with the detected OFDM symbol where the PBCH is located and the OFDM symbol where the SSS is located lags the OFDM symbol where the PBCH is located in the time domain, or the detected OFDM symbol of SSS and the detected OFDM symbol of PBCH are in the same time slot of the same subframe and the OFDM symbol of SSS lags behind the OFDM symbol of PBCH in time domain, or, if the detected OFDM symbol where the SSS is located and the detected OFDM symbol where the PBCH is located are in a second time slot of the same subframe and the detected OFDM symbol where the SSS is located lags behind the detected OFDM symbol where the PBCH is located in the time domain, determining that the current carrier is the first type of carrier; otherwise, determining the current carrier as a second type carrier; or,

if the detected OFDM symbol where the PSS is located lags behind the detected OFDM symbol where the PBCH is located in the time domain, and the detected OFDM symbol where the SSS is located lags behind the detected OFDM symbol where the PBCH is located in the time domain, determining that the current carrier is a first type of carrier; otherwise, determining the current carrier as a second type carrier; or,

if the detected OFDM symbol of the PSS and the detected OFDM symbol of the PBCH are in different time slots of adjacent subframes or adjacent subframes, and the detected OFDM symbol of the SSS and the detected OFDM symbol of the PBCH are in the same subframe or the same time slot of the same subframe, determining that the current carrier is a first type carrier; otherwise, determining the current carrier as a second type carrier; or,

if the detected OFDM symbol where the PSS is located and the detected OFDM symbol where the PBCH is located are in adjacent subframes, the detected OFDM symbol where the SSS is located and the detected OFDM symbol where the PBCH is located are in the same subframe, and the detected OFDM symbols where the PSS and the SSS are located lag behind the detected OFDM symbol where the PBCH is located in a time domain, determining that the current carrier is a first type of carrier; otherwise, determining the current carrier as a second type carrier; or,

if the detected OFDM symbol of the PSS and the detected OFDM symbol of the PBCH are in adjacent subframes, the detected OFDM symbol of the PSS is located in a first time slot of a next subframe, the detected OFDM symbol of the PBCH is located in a second time slot of a previous subframe, the detected OFDM symbol of the SSS and the detected OFDM symbol of the PBCH are in the same subframe or the same time slot of the same subframe, and the detected OFDM symbol of the SSS lags behind the detected OFDM symbol of the PBCH in the time domain, determining that the current carrier is a first type carrier; otherwise, determining the current carrier as a second type carrier; or,

if the detected OFDM symbol of the PSS and the detected OFDM symbol of the PBCH are in adjacent subframes, the detected OFDM symbol of the PSS is located in a first time slot of a next subframe, the detected OFDM symbol of the PBCH is located in a second time slot of a previous subframe, the detected OFDM symbol of the SSS and the detected OFDM symbol of the PBCH are located in a second time slot of the same subframe, and the detected OFDM symbol of the SSS lags behind the detected OFDM symbol of the PBCH in a time domain, determining that the current carrier is a first type carrier; otherwise, determining the current carrier as the second type carrier.

And thirdly, determining the carrier type of the current carrier according to the number of OFDM symbols at intervals of the detected synchronization signal and the detected PBCH in the time domain, and the transmission sequence of the detected synchronization signal and the detected PBCH in the time domain, the position relation of the detected synchronization signal and the detected PBCH in the time domain, or the position relation of the detected synchronization signal and the detected PBCH in the time domain.

Here, the synchronization signal includes a primary synchronization signal PSS and/or a secondary synchronization signal SSS.

For frame structure type 1, the terminal determines the carrier type of the current carrier according to the number of OFDM symbols spaced in the time domain by the detected synchronization signal and the detected PBCH, and the transmission sequence in the time domain by the detected synchronization signal and the detected PBCH, or the position relationship of the time slot in which the detected synchronization signal is located, or the position relationship of the subframe in which the detected synchronization signal is located, which can be specifically implemented as follows:

if the transmission sequence of the detected OFDM symbol where the PSS is located and the detected OFDM symbol where the PBCH is located on the time domain, the position relation of the detected time slot or the position relation of the detected subframe meet a first condition, and the k-th OFDM symbol of the detected OFDM symbol where the PSS is located and the k-1 OFDM symbol of the detected OFDM symbol where the PBCH is located are spaced on the time domain, determining that the current carrier is a first type of carrier; otherwise, determining the current carrier as a second type carrier; or,

if the transmission sequence of the detected OFDM symbol where the SSS is located and the detected OFDM symbol where the PBCH is located on the time domain, the position relation of the detected time slot or the position relation of the detected subframe meet a second condition, and k OFDM symbols are spaced in the time domain in the detected OFDM symbol where the SSS is located and the detected kth OFDM symbol in the detected OFDM symbol where the PBCH is located, determining that the current carrier is a first-class carrier; otherwise, determining the current carrier as a second type carrier; or,

if the transmission sequence of the detected PSS-located OFDM symbol and the detected PBCH-located OFDM symbol in the time domain or the position relation of the detected PBCH-located OFDM symbol or the position relation of the detected subframe meets a first condition, the k-1 OFDM symbol is spaced in the time domain between the detected PSS-located OFDM symbol and the detected PBCH-located OFDM symbol, the transmission sequence of the detected SSS-located OFDM symbol and the detected PBCH-located OFDM symbol in the time domain or the position relation of the detected time slot or the position relation of the detected subframe meets a second condition, the detected SSS-located OFDM symbol and the detected PBCH-located OFDM symbol in the k-th OFDM symbol are spaced in the time domain by k OFDM symbols, and the current carrier is determined to be a first type carrier; otherwise, determining the current carrier as a second type carrier;

and K is more than or equal to 1 and less than or equal to K, and K is the number of OFDM symbols in which PBCH transmission is positioned on the first type carrier. Preferably, K = 4.

The above various combination situations may be further combinations of different situations corresponding to the PSS/SSS in the first method and combination situations of various sub-conditions of the first condition and/or the second condition in the second method, which are not described herein again, and other combination situations are not excluded.

For frame structure type 2, the terminal determines the carrier type of the current carrier according to the number of OFDM symbols in the time domain of the detected synchronization signal and the detected PBCH, and the transmission sequence of the detected synchronization signal and the detected PBCH in the time domain, or the position relationship of the time slot in which the detected synchronization signal is located, or the position relationship of the subframe in which the detected synchronization signal is located, which can be specifically implemented as follows:

if the transmission sequence of the detected OFDM symbol in which the PSS is located and the detected OFDM symbol in which the PBCH is located on the time domain, the position relation of the detected time slot or the position relation of the detected subframe meet a third condition, and the K-K + A OFDM symbols are spaced in the time domain in the detected OFDM symbol in which the PSS is located and the detected OFDM symbol in which the PBCH is located, determining that the current carrier is the first type of carrier; otherwise, determining the current carrier as a second type carrier; or,

if the transmission sequence of the detected OFDM symbol where the SSS is located and the detected OFDM symbol where the PBCH is located in the time domain, the position relation of the detected time slot or the position relation of the detected subframe meet a fourth condition, and K-K + B OFDM symbols are spaced in the time domain in the detected OFDM symbol where the SSS is located and the detected K-th OFDM symbol in the detected OFDM symbol where the PBCH is located, determining that the current carrier is a first type carrier; otherwise, determining the current carrier as a second type carrier; or,

if the transmission sequence of the detected PSS-located OFDM symbol and the detected PBCH-located OFDM symbol in the time domain or the position relation of the detected PBCH-located OFDM symbol or the position relation of the detected subframe meets a third condition, the detected PSS-located OFDM symbol and the detected PBCH-located OFDM symbol in the kth OFDM symbol are spaced by K-K + A OFDM symbols in the time domain, the detected SSS-located OFDM symbol and the detected PBCH-located OFDM symbol in the time domain or the position relation of the detected PBCH-located OFDM symbol or the detected subframe meets a fourth condition, the detected SSS-located OFDM symbol and the detected PBCH-located OFDM symbol in the kth OFDM symbol are spaced by K-K + B OFDM symbols in the time domain, and the current carrier is determined to be a first-type carrier; otherwise, determining the current carrier as a second type carrier;

k is more than or equal to 1 and less than or equal to K, and K is the number of OFDM symbols in which PBCH transmission is positioned on the first type carrier; under normal CP, a =5, B =2, under extended CP, a =4, B = 1. Preferably, K = 4. The terminal determines the type of the CP according to the detected synchronization signal.

The above various combination situations may be further combinations of different situations corresponding to the PSS/SSS in the first method and various combination situations of the sub-conditions of the third condition and the fourth condition in the second method, which are not described herein again and are not excluded.

Specifically, in step 51, the terminal determines the carrier type of the current carrier according to the detected PBCH, and the specific implementation may adopt one of the following three ways:

the first method is as follows: determining the carrier type of the current carrier according to the type of the detected demodulation signal used by the PBCH;

specifically, if the detected demodulation signal used by the PBCH is a cell specific reference signal (CRS), it is determined that the current carrier is a first type of carrier; and if the detected demodulation signal used by the PBCH is a downlink user Dedicated Reference Signal (DRS), determining that the current carrier is the second type carrier.

The second method comprises the following steps: determining the carrier type of the current carrier according to the detected time domain and/or frequency domain resource of the PBCH;

specifically, if the following condition five and/or condition six are satisfied, the current carrier is determined to be the first type of carrier; otherwise, determining the current carrier as a second type carrier; wherein:

the fifth condition includes: the time domain position of the PBCH is detected to be the first 4 OFDM symbols of a time slot, or the first subframe in a wireless frame, or the second time slot of a subframe, or the first 4 OFDM symbols of the second time slot of the first subframe in a wireless frame;

for example, PBCH on legacy carrier is transmitted on the first 4 OFDM symbols of the 2 nd slot of subframe 0, and it is assumed that the transmission subframe and/or slot position of PBCH on NCT carrier and/or the OFDM symbol position in one slot are different from legacy carrier, for example, PBCH on NCT carrier is transmitted on the first 4 OFDM symbols of the 2 nd slot of subframe 1, or transmitted on the first 4 OFDM symbols of the 1 st slot of subframe 0, or transmitted on the 2 nd to 5 th OFDM symbols of the 2 nd slot of subframe 0, it can be determined whether the carrier is legacy carrier or NCT carrier according to which carrier the above definition is satisfied by the specific time domain position of the detected OFDM where PBCH is transmitted.

The sixth condition includes: the detected time-frequency domain resource of the PBCH is REs except for REs corresponding to CRS on antenna ports 0, 1, 2, and 3 on the OFDM symbol where the PBCH is transmitted in 6 Physical Resource Blocks (PRBs) in the center of the current carrier frequency domain.

For example, PBCH on legacy carriers is transmitted on the first 4 OFDM symbols of the 2 nd slot of subframe 0, and resource mapping of PBCH reserves REs corresponding to CRSs on antenna ports 0 to 3, that is, PBCH is not transmitted on REs corresponding to CRSs of 4 antenna ports on PBCH resources; meanwhile, on the NCT carrier, it is currently determined that only CRS transmission on the antenna port 0 exists, and 5ms is used as periodic transmission, if the CRS transmission subframe includes a PBCH transmission subframe, PBCH on the NCT carrier may only reserve REs corresponding to CRS on the antenna port 0, that is, PBCH is not transmitted only on REs corresponding to CRS on the antenna port 0 on PBCH resources, and if the CRS transmission subframe does not include a PBCH transmission subframe, PBCH on the NCT carrier may not reserve REs corresponding to any CRS, that is, PBCH is transmitted on all REs on PBCH resources; in this case, if the time-frequency domain resources (i.e., the resource mapping manner) of the PBCH on the legacy carrier and the NCT carrier are different, it can be determined whether the carrier is a legacy carrier or an NCT carrier according to which carrier the specific resource mapping manner of the PBCH satisfies the definition of the legacy carrier.

The third method comprises the following steps: and determining the carrier type of the current carrier according to the detected coding bit number carried by the PBCH.

Specifically, if the number of coded bits carried by the detected PBCH is 1920 bits under the normal CP and 1728 bits under the extended CP, it is determined that the current carrier is the first type of carrier; otherwise, determining the current carrier as the second type carrier.

In the method, the first type of carrier may be a legacy (legacy) carrier, and the second type of carrier may be a New Carrier Type (NCT) carrier.

In the method, the terminal determines the carrier type of the current carrier according to a position relationship between a resource where a synchronization signal detected on the current carrier is located and a resource where a CRS is detected, or according to a transmission subframe of the detected CRS.

Referring to fig. 6, a method for identifying a second carrier type according to an embodiment of the present invention includes the following steps:

step 60: the terminal detects a synchronous signal on the current carrier wave and detects a CRS according to the detected synchronous signal;

and 61, the terminal determines the carrier type of the current carrier according to the position relation between the detected resource of the synchronous signal and the detected resource of the CRS or the detected transmission subframe of the CRS.

Specifically, in step 61, the terminal determines the carrier type of the current carrier according to the position relationship between the resource where the detected synchronization signal is located and the resource where the detected CRS is located, and the specific implementation may adopt one of the following four schemes:

the first scheme is as follows: determining the carrier type of the current carrier according to the OFDM symbols where the detected synchronous signals are located and the OFDM symbols where the detected CRS is located, and the number of the OFDM symbols spaced in the time domain;

wherein the synchronization signal comprises a PSS and/or a SSS.

The terminal determines the carrier type of the current carrier according to the number of OFDM symbols spaced in the time domain, where the detected OFDM symbol is located by the synchronization signal and the detected OFDM symbol is located by the CRS, and the specific implementation can be implemented according to the following method:

if the minimum interval between the detected OFDM symbol where the PSS is located and the detected OFDM where the CRS is located in the time domain is 0 OFDM symbol, determining that the current carrier is a first type of carrier; otherwise, determining the current carrier as a second type carrier; or,

if the minimum interval between the detected OFDM symbol where the SSS is located and the detected OFDM where the CRS is located is 0 OFDM symbol in the time domain, determining that the current carrier is a first type carrier; otherwise, determining the current carrier as a second type carrier; or,

if the minimum separation in the time domain between the detected OFDM symbol where the PSS is located and the detected OFDM where the CRS is located is 0 OFDM symbol, and the minimum separation in the time domain between the detected OFDM symbol where the SSS is located and the detected OFDM where the CRS is located is 0 OFDM symbol, determining that the current carrier is a first type carrier; otherwise, determining the current carrier as the second type carrier.

Scheme II: determining the carrier type of the current carrier according to the transmission sequence of the detected OFDM symbol where the synchronous signal is located and the detected OFDM symbol where the CRS is located in the time domain, or the position relation of the time slot where the synchronous signal is located or the position relation of the subframe where the synchronous signal is located;

if the detected OFDM in which the CRS is located has the symbol of the OFDM symbol in which the PSS is located, which is detected to be in advance and behind, the current carrier is determined to be the first type carrier; otherwise, determining the current carrier as a second type carrier; or,

if the detected OFDM where the CRS is located has the symbol of the OFDM where the SSS is located, which is detected in advance and behind, the current carrier is determined to be the first type carrier; otherwise, determining the current carrier as a second type carrier; or,

if the detected OFDM with the CRS has the symbol of the OFDM symbol with the detected PSS in advance and behind and the detected OFDM with the CRS has the symbol of the OFDM symbol with the detected SSS in advance and behind, determining that the current carrier is the first type carrier; otherwise, determining the current carrier as the second type carrier.

This is because CRS is transmitted on legacy carriers in each subframe, there is transmission at least on OFDM symbols before and after the synchronization signal, while CRS is transmitted on NCT carriers with a period of 5ms, and if CRS is not in the same subframe as the synchronization signal on NCT carriers, the carrier type can be determined according to whether CRS is detected on both OFDM symbols before and after the synchronization signal.

The third scheme is as follows: determining the carrier type of the current carrier according to the OFDM symbols in which the detected synchronous signals are located and the detected CRS, the number of the OFDM symbols spaced in the time domain, the transmission sequence of the OFDM symbols in which the detected synchronous signals are located and the OFDM symbols in which the detected CRS is located in the time domain, or the position relationship of the time slots in which the detected synchronous signals are located or the position relationship of the subframes in which the detected CRS is located;

wherein the synchronization signal comprises a PSS and/or a SSS.

The terminal determines the carrier type of the current carrier according to the number of OFDM symbols spaced in the time domain, the transmission sequence in the time domain, the position relationship of the time slot or the position relationship of the subframe, of the detected OFDM symbol of the synchronization signal and the detected OFDM symbol of the CRS, and the specific implementation can be realized according to the following method:

if the OFDM symbol where the detected PSS is located and the OFDM symbol which is closest to the PSS and is ahead of the PSS in the OFDM where the detected CRS is located are separated by 1 OFDM symbol in a time domain, determining that the current carrier is a first type carrier; otherwise, determining the current carrier as a second type carrier; or,

if 0 OFDM symbol is spaced in the time domain between the detected OFDM symbol of the PSS and the detected OFDM symbol which is closest to the PSS and lags behind the PSS in the OFDM of the CRS, determining that the current carrier is a first type carrier; otherwise, determining the current carrier as a second type carrier; or,

if the OFDM symbols where the SSS is located and the OFDM symbols which are closest to the SSS and are ahead of the SSS in the OFDM where the CRS is located are separated by 0 OFDM symbols in the time domain, determining that the current carrier is a first type carrier; otherwise, determining the current carrier as a second type carrier; or,

if 1 OFDM symbol is spaced in a time domain between the detected OFDM symbol of the SSS and the detected OFDM symbol which is closest to the SSS and lags behind the SSS in the OFDM of the CRS, determining that the current carrier is a first type carrier; otherwise, determining the current carrier as a second type carrier; or,

if 1 OFDM symbol is spaced in the time domain by the OFDM symbol which is the most adjacent to the PSS and is ahead of the PSS in the OFDM which is the most adjacent to the PSS and is the most ahead of the CRS, and 0 OFDM symbol is spaced in the time domain by the OFDM symbol which is the most adjacent to the PSS and is behind the PSS in the OFDM which is the most adjacent to the PSS and is the most behind the CRS, the current carrier is determined to be a first type carrier; otherwise, determining the current carrier as a second type carrier; or,

if the OFDM symbol where the SSS is located and the OFDM symbol which is closest to the SSS and is ahead of the SSS in the OFDM where the CRS is located are separated by 0 OFDM symbols in the time domain, and the OFDM symbol where the SSS is located and the OFDM symbol which is closest to the SSS and is behind the SSS in the OFDM where the CRS is located are separated by 1 OFDM symbol in the time domain, determining that the current carrier is a first type carrier; otherwise, determining the current carrier as a second type carrier; or,

if the OFDM symbol where the detected PSS is located and the OFDM symbol which is closest to the PSS and is ahead of the PSS in the OFDM where the detected CRS is located are separated by 1 OFDM symbol in the time domain, and the OFDM symbol where the detected PSS is located and the OFDM where the detected CRS is located are closest to the PSS and are behind the OFDM of the PSS, 0 OFDM symbol is separated in the time domain, the OFDM symbol where the detected SSS is located and the OFDM where the detected CRS is closest to the SSS and are ahead of the OFDM symbol of the SSS are separated by 0 OFDM symbol in the time domain, and the OFDM symbol where the detected SSS is located and the OFDM where the detected CRS is closest to the SSS and are behind the OFDM symbol of the SSS are separated by 1 OFDM symbol in the time domain, the current carrier is determined to be a first type carrier; otherwise, determining the current carrier as the second type carrier.

And the scheme is as follows: determining the carrier type of the current carrier according to whether the detected subframe where the synchronous signal is located is the same as the detected subframe where the CRS is located;

specifically, if the detected subframe in which the synchronization signal is located is the same as the detected subframe in which the CRS is located, determining that the current carrier is the first type carrier; otherwise, determining the current carrier as the second type carrier. This is because the CRS is transmitted in each subframe on legacy carriers, the CRS is transmitted only in a period of 5ms on NCT carriers, and if it is predetermined that the CRS on NCT carriers and the synchronization signal are not transmitted in the same subframe, the carrier type can be determined by whether the UE simultaneously detects the synchronization signal and the CRS in the same subframe.

In step 61, the terminal determines the carrier type of the current carrier according to the detected transmission subframe of the CRS, which may be specifically implemented as follows:

if CRS is detected in at least 2 continuous subframes, determining that the current carrier is a first type carrier; otherwise, determining the current carrier as the second type carrier. This is because there is transmission of CRS in every subframe on legacy carriers, and CRS is transmitted only with a period of 5ms on NCT carriers.

In the method, the first type carrier may be a legacy carrier, and the second type carrier may be an NCT carrier.

In order to solve the problem how the terminal identifies the carrier type, an embodiment of the present invention provides a third method for identifying a carrier type.

Referring to fig. 7, a method for identifying a third carrier type according to an embodiment of the present invention includes the following steps:

step 70: the terminal detects a synchronous signal on a current carrier wave;

step 71: and the terminal determines the carrier type of the current carrier according to the detected frequency domain resource used by the transmission of the synchronous signal.

Specifically, the specific implementation of step 71 may be as follows:

if the detected frequency domain resources used for the transmission of the synchronous signals are continuous subcarriers, determining that the current carrier is a first type carrier; otherwise, determining the current carrier as a second type carrier;

wherein the synchronization signal comprises a PSS and/or a SSS.

For example, the frequency domain resource where the synchronization signal is transmitted on the legacy carrier is a continuous subcarrier at the center of the carrier band (for example, a continuous 72 or 62 subcarriers at the center of the band), and the frequency domain resource where the synchronization signal is transmitted on the NCT carrier is a discontinuous subcarrier at the center of the carrier band (for example, the synchronization signal is the same as an OFDM symbol corresponding to a downlink reference signal such as DRS/CRS, and the synchronization signal is mapped only on REs other than REs corresponding to the downlink reference signal such as DRS/CRS).

In the method, the first type of carrier may be a legacy carrier, and the second type of carrier may be an NCT carrier.

Referring to fig. 8, an embodiment of the present invention provides a terminal, where the terminal includes:

a detecting unit 80, configured to detect a synchronization signal on a current carrier, and detect a physical broadcast channel PBCH according to the detected synchronization signal;

an identifying unit 81, configured to determine a carrier type of a current carrier according to a position relationship between a resource where the detected synchronization signal is located and a resource where the detected PBCH is located, or according to the detected PBCH.

Further, the identifying unit 81 is configured to: determining the carrier type of the current carrier according to the position relation between the detected resource of the synchronization signal and the detected resource of the PBCH according to the following method:

determining the carrier type of the current carrier according to the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols spaced on a time domain by the detected synchronization signal and the detected PBCH; or,

determining the carrier type of the current carrier according to the detected synchronization signal and the detected PBCH, the transmission sequence in the time domain or the position relation of the time slot or the position relation of the subframe; or,

and determining the carrier type of the current carrier according to the number of OFDM symbols at intervals of the detected synchronization signal and the detected PBCH in the time domain, and the transmission sequence of the detected synchronization signal and the detected PBCH in the time domain, the position relation of the time slot or the position relation of the subframe.

Further, the synchronization signals comprise primary synchronization signals PSS and/or secondary synchronization signals SSS.

Further, the identifying unit 81 is configured to: for the frame structure type 1, determining the carrier type of the current carrier according to the number of OFDM symbols spaced by the detected synchronization signal and the detected PBCH in the time domain according to the following method:

when k OFDM symbols are separated in the time domain by k-1 OFDM symbols in the detected OFDM symbol in which the PSS is located and the detected k OFDM symbol in the detected OFDM symbol in which the PBCH is located, and k OFDM symbols are separated in the time domain by the detected OFDM symbol in which the SSS is located and the detected k OFDM symbol in the detected OFDM symbol in which the PBCH is located, determining that the current carrier is the first type carrier; otherwise, determining the current carrier as a second type carrier;

and K is more than or equal to 1 and less than or equal to K, wherein K is the number of the OFDM symbols in which PBCH is transmitted on the first type carrier.

Further, the identifying unit 81 is configured to: for the frame structure type 2, the carrier type of the current carrier is determined according to the number of OFDM symbols spaced by the detected synchronization signal and the detected PBCH in the time domain as follows:

k is more than or equal to 1 and less than or equal to K, and K is the number of OFDM symbols in which PBCH is transmitted on the first type carrier; under normal cyclic prefix CP, a =5, B =2, and under extended CP, a =4, B = 1.

Further, the identifying unit 81 is configured to: for the frame structure type 1, determining the carrier type of the current carrier according to the transmission sequence of the detected synchronization signal and the detected PBCH in the time domain, the position relationship of the time slot or the position relationship of the subframe, as follows:

Further, the identifying unit 81 is configured to: for the frame structure type 2, the carrier type of the current carrier is determined according to the transmission sequence of the detected synchronization signal and the detected PBCH in the time domain, the position relationship of the time slot where the synchronization signal is located, or the position relationship of the subframe where the synchronization signal is located, as follows:

Further, the identifying unit 81 is configured to: for frame structure type 1, determining the carrier type of the current carrier according to the number of OFDM symbols of the detected synchronization signal and the detected PBCH spaced in the time domain, and the transmission sequence of the detected synchronization signal and the detected PBCH in the time domain or the position relationship of the time slot or the position relationship of the subframe, as follows:

and K is more than or equal to 1 and less than or equal to K, and K is the number of OFDM symbols in which PBCH transmission is positioned on the first type carrier.

Further, the identifying unit 81 is configured to: for frame structure type 2, the carrier type of the current carrier is determined according to the number of OFDM symbols of the detected synchronization signal and the detected PBCH spaced in the time domain, and the transmission sequence of the detected synchronization signal and the detected PBCH in the time domain, or the position relationship of the time slot in which the detected synchronization signal is located, or the position relationship of the subframe in which the detected synchronization signal is located, as follows:

k is more than or equal to 1 and less than or equal to K, and K is the number of OFDM symbols in which PBCH transmission is positioned on the first type carrier; under normal CP, a =5, B =2, under extended CP, a =4, B = 1.

Further, the first condition includes: the detected OFDM symbol of the PSS is in a time domain before the detected OFDM symbol of the PBCH, or the detected OFDM symbol of the PSS and the detected OFDM symbol of the PBCH are in the same subframe or different time slots of the same subframe, or the detected OFDM symbol of the PSS and the detected OFDM symbol of the PBCH are in the same subframe and the detected OFDM symbol of the PBCH is in the time domain before the detected OFDM symbol of the PBCH, or the detected OFDM symbol of the PSS and the detected OFDM symbol of the PBCH are in the same subframe and the detected OFDM symbol of the PBCH is in the first time slot of the subframe, and the detected OFDM symbol of the PBCH is in the second time slot of the subframe;

the second condition includes: the method includes the steps that a detected OFDM symbol where SSS is located exceeds a detected OFDM symbol where PBCH is located in a time domain, or the detected OFDM symbol where SSS is located and the detected OFDM symbol where PBCH is located are in the same subframe or different time slots of the same subframe, or the detected OFDM symbol where SSS is located and the detected OFDM symbol where PBCH is located are in the same subframe and the detected OFDM symbol where SSS is located exceeds the detected OFDM symbol where PBCH is located in the time domain, or the detected OFDM symbol where SSS is located and the detected OFDM symbol where PBCH is located are in the same subframe and the detected OFDM symbol where SSS is located is in a first time slot of the subframe, and the detected OFDM symbol where PBCH is located is in a second time slot of the subframe.

Further, the third condition includes: the OFDM symbol where the PSS is located is detected to lag behind the OFDM symbol where the PBCH is detected in the time domain, or the detected OFDM symbol where the PSS is located and the detected OFDM symbol where the PBCH is located are in different time slots of an adjacent subframe or an adjacent subframe, or the detected OFDM symbol where the PSS is located and the detected OFDM symbol where the PBCH is located are in the adjacent subframe and the detected OFDM symbol where the PSS is located to lag behind the OFDM symbol where the PBCH is located in the time domain, or the detected OFDM symbol where the PSS is located and the detected OFDM symbol where the PBCH is located in the adjacent subframe and the detected OFDM symbol where the PBCH is located in a first time slot of a next subframe, and the detected OFDM symbol where the PBCH is located in a second time slot of a;

the fourth condition includes: the OFDM symbol where the SSS is detected lags behind the OFDM symbol where the PBCH is detected in the time domain, or the OFDM symbol where the SSS is detected and the OFDM symbol where the PBCH is detected are in the same subframe or the same slot of the same subframe, or the OFDM symbol where the SSS is detected and the OFDM symbol where the PBCH is detected are in the same subframe and the OFDM symbol where the SSS is detected lags behind the PBCH in the time domain, or the OFDM symbol where the SSS is detected and the OFDM symbol where the PBCH is detected and the OFDM symbol where the SSS is detected are in the same slot of the same subframe and the OFDM symbol where the SSS is detected lags behind the PBCH in the time domain, or the OFDM symbol where the SSS is detected and the OFDM symbol where the PBCH is detected and the OFDM symbol where the SSS is detected are in the second slot of the same subframe and the OFDM symbol where the SSS is lags behind the PBCH in the time domain.

Further, the identifying unit 81 is configured to: determining the carrier type of the current carrier according to the detected PBCH according to the following method:

determining the carrier type of the current carrier according to the type of the detected demodulation signal used by the PBCH; or,

determining the carrier type of the current carrier according to the detected time domain and/or frequency domain resource of the PBCH; or,

and determining the carrier type of the current carrier according to the detected coding bit number carried by the PBCH.

Further, the identifying unit 81 is configured to: determining the carrier type of the current carrier according to the type of the detected demodulation signal used by the PBCH according to the following method:

if the detected demodulation signal used by the PBCH is a cell-specific reference signal (CRS), determining that the current carrier is a first carrier; and if the detected demodulation signal used by the PBCH is a reference signal DRS special for the downlink user, determining that the current carrier is the second carrier.

Further, the identifying unit 81 is configured to: determining the carrier type of the current carrier according to the detected time domain and/or frequency domain resources of the PBCH according to the following method:

if the detected time domain position of the PBCH is the first 4 OFDM symbols of a time slot, or the first subframe in a wireless frame, or the second time slot of a subframe, or the first 4 OFDM symbols of the second time slot of a first subframe in a wireless frame, determining that the current carrier is the first type carrier; otherwise, determining the current carrier as a second type carrier; and/or the presence of a gas in the gas,

if the detected time-frequency domain resource of the PBCH is the RE except the RE corresponding to the CRS on the antenna ports 0, 1, 2 and 3 on the OFDM symbol where the PBCH is transmitted in 6 physical resource blocks PRB in the center of the frequency domain of the current carrier, determining that the current carrier is the first type carrier; otherwise, determining the current carrier as the second type carrier.

Further, the identifying unit 81 is configured to: determining the carrier type of the current carrier according to the detected coding bit number carried by the PBCH according to the following method:

if the detected coding bit number carried by the PBCH is 1920 bits under the normal CP and 1728 bits under the extended CP, determining that the current carrier is the first carrier; otherwise, determining the current carrier as the second type carrier.

Further, the first type of carrier is a legacy carrier, and the second type of carrier is a new carrier type NCT carrier.

Still referring to fig. 8, an embodiment of the present invention provides another terminal, where the terminal includes:

a detecting unit 80, configured to detect a synchronization signal on a current carrier, and detect a cell-specific reference signal CRS according to the detected synchronization signal;

the identifying unit 81 is configured to determine the carrier type of the current carrier according to a position relationship between a resource where the detected synchronization signal is located and a resource where the detected CRS is located, or according to a transmission subframe of the detected CRS.

Further, the identifying unit 81 is configured to: determining the carrier type of the current carrier according to the position relationship between the detected resource of the synchronous signal and the detected resource of the CRS according to the following method:

determining the carrier type of the current carrier according to the OFDM symbols where the detected synchronous signals are located and the OFDM symbols where the detected CRS is located, and the number of the OFDM symbols spaced in the time domain; or,

determining the carrier type of the current carrier according to the transmission sequence of the detected OFDM symbol where the synchronous signal is located and the detected OFDM symbol where the CRS is located in the time domain, or the position relation of the time slot where the synchronous signal is located or the position relation of the subframe where the synchronous signal is located; or,

determining the carrier type of the current carrier according to the OFDM symbols in which the detected synchronous signals are located and the detected CRS, the number of the OFDM symbols spaced in the time domain, the transmission sequence of the OFDM symbols in which the detected synchronous signals are located and the OFDM symbols in which the detected CRS is located in the time domain, or the position relationship of the time slots in which the detected synchronous signals are located or the position relationship of the subframes in which the detected CRS is located; or,

determining the carrier type of the current carrier according to whether the detected subframe where the synchronous signal is located is the same as the detected subframe where the CRS is located;

wherein the synchronization signals comprise primary synchronization signals PSS and/or secondary synchronization signals SSS.

Further, the identifying unit 81 is configured to: determining the carrier type of the current carrier according to the number of OFDM symbols spaced in the time domain by the OFDM symbols where the detected synchronous signals are located and the OFDM symbols where the detected CRS is located according to the following method:

Further, the identifying unit 81 is configured to: determining the carrier type of the current carrier according to the OFDM symbol where the detected synchronous signal is located and the OFDM symbol where the detected CRS is located, the number of the OFDM symbols spaced in the time domain, the transmission sequence of the OFDM symbol where the detected synchronous signal is located and the OFDM symbol where the detected CRS is located in the time domain, the position relationship of the time slot where the detected synchronous signal is located or the position relationship of the subframe where the detected synchronous signal is located in the time domain, according to the following method:

Further, the identifying unit 81 is configured to: determining the carrier type of the current carrier according to whether the detected subframe of the synchronous signal is the same as the detected subframe of the CRS according to the following method:

if the detected subframe of the synchronous signal is the same as the detected subframe of the CRS, determining that the current carrier is a first type carrier; otherwise, determining the current carrier as the second type carrier.

Further, the identifying unit 81 is configured to: determining the carrier type of the current carrier according to the detected transmission subframe of the CRS according to the following method:

if CRS is detected in at least 2 continuous subframes, determining that the current carrier is a first type carrier; otherwise, determining the current carrier as the second type carrier.

a detection unit 80 for detecting a synchronization signal on a current carrier;

the identifying unit 81 is configured to determine a carrier type of a current carrier according to the detected frequency domain resource used for transmitting the synchronization signal.

Further, the identifying unit 81 is configured to:

The first embodiment is as follows:

in the FDD system, taking the normal CP as an example, one slot includes 7 OFDM symbols:

for legacy carriers, PSS is transmitted in the last OFDM symbol of the 1 st slot of subframes 0 and 5, SSS is transmitted in the 2 nd last OFDM symbol of the first slot of subframes 0 and 5, PBCH is transmitted in the first 4 OFDM symbols of the second slot of subframe 0, then the OFDM symbol where PSS is located is adjacent to the first OFDM symbol where PBCH is located (i.e., spaced by 0 OFDM symbols), and the OFDM symbol where SSS is located is spaced by 1 OFDM symbol from the first OFDM symbol where PBCH is located;

for the NCT carrier, assuming that PSS is transmitted in the 3 rd OFDM symbol of the 1 st slot of subframes 0 and 5, SSS is transmitted in the 2 nd OFDM symbol of the first slot of subframes 0 and/5, and the transmission position of PBCH is the same as legacy carrier, the OFDM symbol where PSS is located is separated from the first OFDM symbol where PBCH is located by 4 OFDM symbols, and the OFDM symbol where SSS is located is separated from the first OFDM symbol where PBCH is located by 5 OFDM symbols;

at this time, the carrier type may be determined according to the number of detected OFDM symbols between the OFDM symbol where the PSS is located and the first OFDM symbol where the PBCH is located, and/or the number of detected OFDM symbols between the OFDM symbol where the SSS is located and the first OFDM symbol where the PBCH is located, which is consistent with the value corresponding to which carrier, for example, the OFDM symbol where the PSS is located and the first OFDM symbol where the PBCH is located are separated by 0 OFDM symbol, which is a legacy carrier, or else, the OFDM symbol where the PSS is located (i.e., separated by 4 symbols), which is an NCT carrier.

Example two:

for legacy carriers, PSS is transmitted in the last OFDM symbol of the 1 st slot of subframes 0 and 5, SSS is transmitted in the 2 nd last OFDM symbol of the first slot of subframes 0 and 5, PBCH is transmitted in the first 4 OFDM symbols of the second slot of subframe 0; then the relative positions of the PSS/SSS and PBCH satisfy: 1) the OFDM symbols of the PSS and the SSS are ahead of the OFDM symbols of the PBCH; 2) the OFDM symbols of the PSS and the SSS and the OFDM symbols of the PBCH are both in subframe 0; 3) the OFDM symbols of the PSS and the SSS and the OFDM symbols of the PBCH are both in the subframe 0, and the OFDM symbols of the PSS and the SSS exceed the OFDM symbols of the PBCH in the time domain; 4) the OFDM symbols of the PSS and the SSS and the OFDM symbols of the PBCH are both in the subframe 0, the OFDM symbols of the PSS and the SSS are in the first time slot of the subframe 0, and the OFDM symbols of the PBCH are in the second time slot of the subframe 0;

for the NCT carrier, assuming that PSS is transmitted in the 3 rd OFDM symbol of the 1 st slot of subframes 1 and 6, SSS is transmitted in the 2 nd OFDM symbol of the first slot of subframes 1 and 6, and PBCH is transmitted in the same legacy carrier, the relative positions of PSS/SSS and PBCH satisfy: 1) OFDM symbols where the PSS and the SSS are located lag behind OFDM symbols where the PBCH is located; 2) the OFDM symbols of the PSS and the SSS are in different subframes from the OFDM symbols of the PBCH, 3) the OFDM symbols of the PSS and the SSS are in different subframes from the OFDM symbols of the PBCH, and the OFDM symbols of the PSS and the SSS lag behind the OFDM symbols of the PBCH in the time domain, 4) the OFDM symbols of the PSS and the SSS are in different subframes from the OFDM symbols of the PBCH, and the OFDM symbols of the PSS and the SSS are in a first time slot of a subframe 1 and the OFDM symbols of the PBCH are in a second time slot of a subframe 0;

at this time, the carrier type may be determined according to a transmission sequence of the detected PSS and/or SSS in the time domain of the OFDM symbol and the detected PBCH in the first OFDM symbol, or a position relationship of the time slot in which the OFDM symbol is located, or a position relationship of the subframe in which the OFDM symbol is located.

Example three:

for legacy carriers, PSS is transmitted in the last OFDM symbol of the 1 st slot of subframes 0 and 5, SSS is transmitted in the 2 nd last OFDM symbol of the first slot of subframes 0 and 5, PBCH is transmitted in the first 4 OFDM symbols of the second slot of subframe 0; then the relative positions of the PSS/SSS and PBCH satisfy: 1) the OFDM symbol where the PSS is located is adjacent to the first OFDM symbol where the PBCH is located (i.e., separated by 0 OFDM symbols), and the OFDM symbol where the SSS is separated from the first OFDM symbol where the PBCH is located by 1 OFDM symbol; 2) the OFDM symbols of the PSS and the SSS are ahead of the OFDM symbols of the PBCH; 3) the OFDM symbols of the PSS and the SSS and the OFDM symbols of the PBCH are both in subframe 0; 4) the OFDM symbols of the PSS and the SSS and the OFDM symbols of the PBCH are both in the subframe 0, and the OFDM symbols of the PSS and the SSS exceed the OFDM symbols of the PBCH in the time domain; 5) the OFDM symbols of the PSS and the SSS and the OFDM symbols of the PBCH are both in the subframe 0, the OFDM symbols of the PSS and the SSS are in the first time slot of the subframe 0, and the OFDM symbols of the PBCH are in the second time slot of the subframe 0;

for the NCT carrier, assuming that PSS is transmitted in the 3 rd OFDM symbol of the 1 st slot of subframes 1 and 6, SSS is transmitted in the 2 nd OFDM symbol of the first slot of subframes 1 and 6, and PBCH is transmitted in the same legacy carrier, the relative positions of PSS/SSS and PBCH satisfy: 1) the OFDM symbol where the PSS is located and the first OFDM symbol where the PBCH is located are separated by 8 OFDM symbols, and the OFDM symbol where the SSS is located and the first OFDM symbol where the PBCH is located are separated by 7 OFDM symbols; 2) OFDM symbols where the PSS and the SSS are located lag behind OFDM symbols where the PBCH is located; 3) the OFDM symbols where the PSS and the SSS are located and the OFDM symbols where the PBCH is located are in different subframes; 4) the OFDM symbols where the PSS and the SSS are located and the OFDM symbols where the PBCH is located are in different subframes, and the OFDM symbols where the PSS and the SSS are located lags behind the OFDM symbols where the PBCH is located in a time domain; 5) the OFDM symbols of the PSS and the SSS are in different subframes from the OFDM symbols of the PBCH, the OFDM symbols of the PSS and the SSS are in a first time slot of a subframe 1, and the OFDM symbols of the PBCH are in a second time slot of a subframe 0;

at this time, the carrier type may be determined according to a transmission sequence of the detected OFDM symbol where the PSS and/or the SSS are located and the detected OFDM symbol where the PBCH is located in the time domain, and/or a position relationship of the slot where the PSS and/or the SSS are located and/or a position relationship of the subframe where the PBCH is located, and/or a symbol interval of the OFDM symbol where the PSS and/or the SSS are located and the first OFDM symbol where the PBCH is located, which carrier corresponds to the above-mentioned carrier.

Example four:

for legacy carriers, PSS is transmitted at the last OFDM symbol of the first slot of subframes 0 and/6, SSS is transmitted at the 2 nd last OFDM symbol of the first slot of subframes 0 and/6; CRS may be transmitted at antenna port 0 or port 0, 1, 2, 3, as shown in fig. 2a, 2b, that is, CRS is transmitted at least at the 1 st and 5 th OFDM symbols in each slot of each subframe (when 3 or 4 antenna ports are transmitted, it is also transmitted at the 2 nd and 4 th OFDM symbols), at this time, the OFDM symbol in which PSS is located is separated from the OFDM symbol in which the nearest CRS of the leading PSS is located (i.e., the 5 th OFDM symbol of the first slot) by 1 OFDM symbol, and is adjacent to the OFDM symbol in which the nearest CRS of the trailing PSS is located (i.e., the first OFDM symbol of the second slot) (i.e., separated by 0 OFDM symbol), that is, the OFDM symbol in which PSS is located is separated from the OFDM symbol in which the nearest CRS is located (i.e., the first OFDM symbol of the second slot) by 0 OFDM symbol; an OFDM symbol where an SSS is located and an OFDM symbol where a CRS closest to the SSS is located (namely, the 5 th OFDM symbol of a first slot) are separated by 0 OFDM symbol, and an OFDM symbol where a CRS closest to the SSS is located (namely, the first OFDM symbol of a second slot) is separated by 1 OFDM symbol, namely, an OFDM symbol where the SSS is located and an OFDM symbol where a CRS closest to the SSS is located (namely, the 5 th OFDM symbol of the first slot) are separated by 0 OFDM symbol;

for legacy carriers, CRS is transmitted only on antenna port 0 with a period of 5ms, assuming PSS is transmitted on the 3 rd OFDM symbol of the first slot in subframes 0 and 6 on the NCT carrier, SSS is transmitted on the 2 nd OFDM symbol of the first slot in subframes 0 and 6, then, if the transmission subframes of the CRS are also subframes 0 and 6, at this time, the OFDM symbol of the PSS is spaced by 1 OFDM symbol from the OFDM symbol of the latest CRS preceding the PSS (i.e. the 1 st OFDM symbol of the first slot), the interval between the OFDM symbol of the latest CRS of the lagging PSS (i.e. the 5 th OFDM symbol of the first slot) and the OFDM symbol of the latest CRS of the leading SSS (i.e. the 1 st OFDM symbol of the first slot) is 1 OFDM symbol, the interval between the OFDM symbol and the OFDM symbol where the latest CRS of the laggard SSS is located (namely the 5 th OFDM symbol of the first slot) is 2 OFDM symbols; if the transmission subframes of the CRS are subframes 1 and 7, at this time, 7 OFDM symbols are separated between the OFDM symbol in which the PSS is located and the OFDM symbol in which the latest CRS is located (i.e., the 1 st OFDM symbol of the first slot of the subframe 1), and 8 OFDM symbols are separated between the OFDM symbol in which the SSS is located and the OFDM symbol in which the latest CRS is located (i.e., the 1 st OFDM symbol of the first slot of the subframe 1);

at this time, the carrier type may be determined according to which carrier the number of OFDM symbols between the detected PSS located OFDM symbol and the latest CRS (including the leading and trailing) located OFDM symbol interval satisfies the definition of which carrier, and/or according to which carrier the number of OFDM symbols between the detected SSS located OFDM symbol and the latest CRS (including the leading and trailing) located OFDM symbol interval satisfies the definition of which carrier; or, the carrier type may also be determined according to which carrier the number of OFDM symbols between the detected PSS located OFDM symbol and the most recent CRS located OFDM symbol behind and/or ahead PSS satisfies the definition of which carrier, and/or the number of detected SSS located OFDM symbols between the detected SSS located OFDM symbol and the most recent CRS located OFDM symbol behind and/or ahead SSS satisfies the definition of which carrier.

In conclusion, the beneficial effects of the invention include:

in the solution provided in the embodiment of the present invention, the terminal may determine the carrier type of the current carrier according to the position relationship between the resource where the synchronization signal detected on the current carrier is located and the resource where the detected PBCH is located, or according to the PBCH detected on the current carrier, or according to the position relationship between the resource where the synchronization signal detected on the current carrier is located and the resource where the detected CRS is located, or according to the transmission subframe of the detected CRS on the current carrier, or according to the frequency domain resource used for transmitting the synchronization signal detected on the current carrier, thereby solving the problem how the terminal identifies the carrier type.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A method for identifying a carrier type, the method comprising:

the terminal determines the carrier type of the current carrier according to the position relation between the detected resource of the synchronization signal and the detected resource of the PBCH or according to the detected PBCH;

the carrier type comprises a first type carrier and a second type carrier; the first carrier is a traditional legacy carrier, and the second carrier is a new carrier type NCT carrier.

2. The method of claim 1, wherein the determining, by the terminal, the carrier type of the current carrier according to the position relationship between the resource where the detected synchronization signal is located and the resource where the detected PBCH is located specifically includes:

the terminal determines the carrier type of the current carrier according to the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols spaced on a time domain by the detected synchronization signal and the detected PBCH; or,

determining the carrier type of the current carrier according to the transmission sequence of the detected synchronization signal and the detected PBCH on the time domain, the position relation of the time slot or the position relation of the subframe; or,

3. The method of claim 2, wherein the synchronization signals comprise Primary Synchronization Signals (PSS) and/or Secondary Synchronization Signals (SSS).

4. The method of claim 3, wherein for frame structure type 1, the determining, by the terminal, the carrier type of the current carrier according to the number of OFDM symbols in the time domain where the detected synchronization signal and the detected PBCH are separated includes:

5. The method of claim 3, wherein for frame structure type 2, the determining, by the terminal, the carrier type of the current carrier according to the number of OFDM symbols in the time domain where the detected synchronization signal and the detected PBCH are separated includes:

k is more than or equal to 1 and less than or equal to K, and K is the number of OFDM symbols in which PBCH is transmitted on the first type carrier; under the normal cyclic prefix CP, a-5 and B-2, and under the extended CP, a-4 and B-1.

6. The method of claim 3, wherein for frame structure type 1, the determining, by the terminal, the carrier type of the current carrier according to the transmission order of the detected synchronization signal and the detected PBCH in the time domain, or the position relationship of the time slot in which the synchronization signal is located, or the position relationship of the subframe in which the synchronization signal is located, specifically includes:

if the transmission sequence of the detected OFDM symbol where the PSS is located and the detected OFDM symbol where the PBCH is located in the time domain, the position relation of the detected time slot or the position relation of the detected subframe meet a first condition, and the transmission sequence of the detected OFDM symbol where the SSS is located and the detected OFDM symbol where the PBCH is located in the time domain, the position relation of the detected time slot or the position relation of the detected subframe meet a second condition, determining that the current carrier is a first type carrier; otherwise, determining the current carrier as a second type carrier;

wherein the first condition comprises: the detected OFDM symbol of the PSS is in a time domain before the detected OFDM symbol of the PBCH, or the detected OFDM symbol of the PSS and the detected OFDM symbol of the PBCH are in the same subframe or different time slots of the same subframe, or the detected OFDM symbol of the PSS and the detected OFDM symbol of the PBCH are in the same subframe and the detected OFDM symbol of the PBCH is in the time domain before the detected OFDM symbol of the PBCH, or the detected OFDM symbol of the PSS and the detected OFDM symbol of the PBCH are in the same subframe and the detected OFDM symbol of the PBCH is in the first time slot of the subframe, and the detected OFDM symbol of the PBCH is in the second time slot of the subframe;

7. The method of claim 3, wherein for frame structure type 2, the determining, by the terminal, the carrier type of the current carrier according to the transmission order of the detected synchronization signal and the detected PBCH in the time domain, or the position relationship of the time slot in which the synchronization signal is located, or the position relationship of the subframe in which the synchronization signal is located, specifically includes:

if the transmission sequence of the detected OFDM symbol in which the PSS is located and the detected OFDM symbol in which the PBCH is located in the time domain, the position relation of the detected time slot or the position relation of the detected subframe meet a third condition, and the transmission sequence of the detected OFDM symbol in which the SSS is located and the detected OFDM symbol in which the PBCH is located in the time domain, the position relation of the detected time slot or the position relation of the detected subframe meet a fourth condition, determining that the current carrier is a first type carrier; otherwise, determining the current carrier as a second type carrier;

wherein the third condition comprises: the OFDM symbol where the PSS is located is detected to lag behind the OFDM symbol where the PBCH is detected in the time domain, or the detected OFDM symbol where the PSS is located and the detected OFDM symbol where the PBCH is located are in different time slots of an adjacent subframe or an adjacent subframe, or the detected OFDM symbol where the PSS is located and the detected OFDM symbol where the PBCH is located are in the adjacent subframe and the detected OFDM symbol where the PSS is located to lag behind the OFDM symbol where the PBCH is located in the time domain, or the detected OFDM symbol where the PSS is located and the detected OFDM symbol where the PBCH is located in the adjacent subframe and the detected OFDM symbol where the PBCH is located in a first time slot of a next subframe, and the detected OFDM symbol where the PBCH is located in a second time slot of a;

8. The method of claim 3, wherein for frame structure type 1, the terminal determines the carrier type of the current carrier according to the number of OFDM symbols separated in the time domain by the detected synchronization signal and the detected PBCH, and the transmission order in the time domain by the detected synchronization signal and the detected PBCH, or the position relationship of the slot in which the detected synchronization signal is located, or the position relationship of the subframe in which the detected synchronization signal is located, and specifically includes:

k is more than or equal to 1 and less than or equal to K, and K is the number of OFDM symbols in which PBCH transmission is positioned on the first type carrier;

the first condition includes: the detected OFDM symbol of the PSS is in a time domain before the detected OFDM symbol of the PBCH, or the detected OFDM symbol of the PSS and the detected OFDM symbol of the PBCH are in the same subframe or different time slots of the same subframe, or the detected OFDM symbol of the PSS and the detected OFDM symbol of the PBCH are in the same subframe and the detected OFDM symbol of the PBCH is in the time domain before the detected OFDM symbol of the PBCH, or the detected OFDM symbol of the PSS and the detected OFDM symbol of the PBCH are in the same subframe and the detected OFDM symbol of the PBCH is in the first time slot of the subframe, and the detected OFDM symbol of the PBCH is in the second time slot of the subframe;

9. The method of claim 3, wherein for frame structure type 2, the terminal determines the carrier type of the current carrier according to the number of OFDM symbols separated in the time domain by the detected synchronization signal and the detected PBCH, and the transmission order in the time domain by the detected synchronization signal and the detected PBCH, or the position relationship of the slot in which the detected synchronization signal is located, or the position relationship of the subframe in which the detected synchronization signal is located, and specifically includes:

k is more than or equal to 1 and less than or equal to K, and K is the number of OFDM symbols in which PBCH transmission is positioned on the first type carrier; under normal CP, a ═ 5, B ═ 2, under extended CP, a ═ 4, B ═ 1;

the third condition includes: the OFDM symbol where the PSS is located is detected to lag behind the OFDM symbol where the PBCH is detected in the time domain, or the detected OFDM symbol where the PSS is located and the detected OFDM symbol where the PBCH is located are in different time slots of an adjacent subframe or an adjacent subframe, or the detected OFDM symbol where the PSS is located and the detected OFDM symbol where the PBCH is located are in the adjacent subframe and the detected OFDM symbol where the PSS is located to lag behind the OFDM symbol where the PBCH is located in the time domain, or the detected OFDM symbol where the PSS is located and the detected OFDM symbol where the PBCH is located in the adjacent subframe and the detected OFDM symbol where the PBCH is located in a first time slot of a next subframe, and the detected OFDM symbol where the PBCH is located in a second time slot of a;

10. The method of claim 1, wherein the determining, by the terminal, the carrier type of the current carrier according to the detected PBCH specifically comprises:

11. The method of claim 10, wherein the determining, by the terminal, the carrier type of the current carrier according to the detected type of the demodulation signal used by the PBCH specifically comprises:

12. The method of claim 10, wherein the determining, by the terminal, the carrier type of the current carrier according to the detected time domain and/or frequency domain resource in which the PBCH is located specifically includes:

13. The method of claim 10, wherein the determining, by the terminal, the carrier type of the current carrier according to the detected number of coded bits carried by the PBCH specifically includes:

14. A method for identifying a carrier type, the method comprising:

the terminal determines the carrier type of the current carrier according to the position relation between the detected resource of the synchronous signal and the detected resource of the CRS or according to the detected transmission subframe of the CRS;

15. The method according to claim 14, wherein the determining, by the terminal, the carrier type of the current carrier according to the position relationship between the resource where the detected synchronization signal is located and the resource where the detected CRS is located specifically includes:

16. The method of claim 15, wherein the determining, by the terminal, the carrier type of the current carrier according to the number of OFDM symbols spaced in a time domain by the OFDM symbol where the detected synchronization signal is located and the OFDM symbol where the detected CRS is located specifically includes:

17. The method according to claim 15, wherein the terminal determines the carrier type of the current carrier according to the number of OFDM symbols spaced in the time domain of the OFDM symbol where the detected synchronization signal is located and the OFDM symbol where the detected CRS is located, and the transmission sequence in the time domain of the OFDM symbol where the detected synchronization signal is located and the OFDM symbol where the detected CRS is located, or the positional relationship of the time slot where the detected synchronization signal is located or the positional relationship of the subframe where the detected CRS is located, which specifically includes:

18. The method of claim 15, wherein the determining, by the terminal, the carrier type of the current carrier according to whether the subframe in which the detected synchronization signal is located is the same as the subframe in which the detected CRS is located specifically includes:

19. The method according to claim 14, wherein the determining, by the terminal, the carrier type of the current carrier according to the detected transmission subframe of the CRS, specifically includes:

20. A method for identifying a carrier type, the method comprising:

the terminal detects a synchronous signal on a current carrier wave;

the terminal determines the carrier type of the current carrier according to the detected frequency domain resource used by the transmission of the synchronous signal;

21. The method of claim 20, wherein the determining, by the terminal, the carrier type of the current carrier according to the detected frequency domain resource used for the transmission of the synchronization signal specifically comprises:

22. A terminal, characterized in that the terminal comprises:

an identifying unit, configured to determine a carrier type of a current carrier according to a position relationship between a resource where a detected synchronization signal is located and a resource where a detected PBCH is located, or according to a detected PBCH;

wherein the carrier types include: a first type of carrier and a second type of carrier; the first carrier is a traditional legacy carrier, and the second carrier is a new carrier type NCT carrier.

23. The terminal of claim 22, wherein the identification unit is configured to: determining the carrier type of the current carrier according to the position relation between the detected resource of the synchronization signal and the detected resource of the PBCH according to the following method:

24. The terminal of claim 23, wherein the synchronization signals comprise primary synchronization signals PSS and/or secondary synchronization signals SSS.

25. The terminal of claim 24, wherein the identification unit is configured to: for the frame structure type 1, determining the carrier type of the current carrier according to the number of OFDM symbols spaced by the detected synchronization signal and the detected PBCH in the time domain according to the following method:

26. The terminal of claim 24, wherein the identification unit is configured to: for the frame structure type 2, the carrier type of the current carrier is determined according to the number of OFDM symbols spaced by the detected synchronization signal and the detected PBCH in the time domain as follows:

27. The terminal of claim 24, wherein the identification unit is configured to: for the frame structure type 1, determining the carrier type of the current carrier according to the transmission sequence of the detected synchronization signal and the detected PBCH in the time domain, the position relationship of the time slot or the position relationship of the subframe, as follows:

28. The terminal of claim 24, wherein the identification unit is configured to: for the frame structure type 2, the carrier type of the current carrier is determined according to the transmission sequence of the detected synchronization signal and the detected PBCH in the time domain, the position relationship of the time slot where the synchronization signal is located, or the position relationship of the subframe where the synchronization signal is located, as follows:

29. The terminal of claim 24, wherein the identification unit is configured to: for frame structure type 1, determining the carrier type of the current carrier according to the number of OFDM symbols of the detected synchronization signal and the detected PBCH spaced in the time domain, and the transmission sequence of the detected synchronization signal and the detected PBCH in the time domain or the position relationship of the time slot or the position relationship of the subframe, as follows:

30. The terminal of claim 24, wherein the identification unit is configured to: for frame structure type 2, the carrier type of the current carrier is determined according to the number of OFDM symbols of the detected synchronization signal and the detected PBCH spaced in the time domain, and the transmission sequence of the detected synchronization signal and the detected PBCH in the time domain, or the position relationship of the time slot in which the detected synchronization signal is located, or the position relationship of the subframe in which the detected synchronization signal is located, as follows:

31. The terminal of claim 22, wherein the identification unit is configured to: determining the carrier type of the current carrier according to the detected PBCH according to the following method:

32. The terminal of claim 31, wherein the identification unit is configured to: determining the carrier type of the current carrier according to the type of the detected demodulation signal used by the PBCH according to the following method:

33. The terminal of claim 31, wherein the identification unit is configured to: determining the carrier type of the current carrier according to the detected time domain and/or frequency domain resources of the PBCH according to the following method:

34. The terminal of claim 31, wherein the identification unit is configured to: determining the carrier type of the current carrier according to the detected coding bit number carried by the PBCH according to the following method:

35. A terminal, characterized in that the terminal comprises:

the identification unit is used for determining the carrier type of the current carrier according to the position relation between the detected resource of the synchronous signal and the detected resource of the CRS or the detected transmission subframe of the CRS;

36. The terminal of claim 35, wherein the identification unit is configured to: determining the carrier type of the current carrier according to the position relationship between the detected resource of the synchronous signal and the detected resource of the CRS according to the following method:

37. The terminal of claim 36, wherein the identification unit is configured to: determining the carrier type of the current carrier according to the number of OFDM symbols spaced in the time domain by the OFDM symbols where the detected synchronous signals are located and the OFDM symbols where the detected CRS is located according to the following method:

38. The terminal of claim 36, wherein the identification unit is configured to: determining the carrier type of the current carrier according to the OFDM symbol where the detected synchronous signal is located and the OFDM symbol where the detected CRS is located, the number of the OFDM symbols spaced in the time domain, the transmission sequence of the OFDM symbol where the detected synchronous signal is located and the OFDM symbol where the detected CRS is located in the time domain, the position relationship of the time slot where the detected synchronous signal is located or the position relationship of the subframe where the detected synchronous signal is located in the time domain, according to the following method:

if 1 OFDM symbol is spaced in a time domain between the detected OFDM symbol of the SSS and the detected OFDM symbol which is closest to the SSS and lags behind the SSS in the OFDM of the CRS, determining that the current carrier is a first type carrier; otherwise, determining the current carrier as a second type carrier; or if the detected OFDM symbol of the PSS and the detected OFDM symbol of the CRS, which is the nearest to the PSS and is ahead of the OFDM symbol of the PSS, are separated by 1 OFDM symbol in the time domain, and the detected OFDM symbol of the PSS and the detected OFDM symbol of the CRS, which is the nearest to the PSS and is behind the OFDM symbol of the PSS, are separated by 0 OFDM symbol in the time domain, determining that the current carrier is the first type carrier; otherwise, determining the current carrier as a second type carrier; or,

39. The terminal of claim 36, wherein the identification unit is configured to: determining the carrier type of the current carrier according to whether the detected subframe of the synchronous signal is the same as the detected subframe of the CRS according to the following method:

40. The terminal of claim 35, wherein the identification unit is configured to: determining the carrier type of the current carrier according to the detected transmission subframe of the CRS according to the following method:

41. A terminal, characterized in that the terminal comprises:

a detection unit for detecting a synchronization signal on a current carrier;

the identification unit is used for determining the carrier type of the current carrier according to the detected frequency domain resource used by the transmission of the synchronous signal;

42. The terminal of claim 41, wherein the identification unit is configured to: