WO2013107368A1 - Downlink data transmission method and device therefor - Google Patents

Abstract

Disclosed are a downlink data transmission method and a device therefor. The method is applied to an LTE system. At least one downlink data transmission frequency band is configured in a data domain of a downlink system working frequency band of the LTE system, and the bandwidth of each downlink data transmission frequency band is less than the bandwidth occupied by a control channel area of the LTE system. The method comprises: a network device sending control signaling to a terminal through a downlink control channel in an LTE system control area, so as to schedule the terminal to perform downlink data transmission in the downlink data transmission frequency band; the network device transmitting data in the downlink data transmission frequency band for the terminal in the downlink data transmission frequency band. By using the present invention, the data transmission bandwidth of the terminal can be reduced, and cost reduction of the terminal and compatibility of the control channel are both achieved.

Description

 The invention relates to a Chinese patent application filed on January 21, 2012, and the application number is 201210020090.1, and the invention title is "a downlink data transmission method and its equipment". , the entire contents of which are incorporated by reference in the technical field of the present application

 The present invention relates to the field of wireless communications, and in particular, to a downlink data transmission method and device thereof.

 The Internet of Things technology is in the ascendant, and it needs to support MTC (Machine Type Cotnmui Hcat:ion > Machine Type Communication) in the third generation mobile communication system and its Long Term Evoluiion (UIE). As a new concept of communication, MTC aims to combine many different types of communication technologies, such as: machine-to-machine communication, machine control communication, human-computer interaction communication, mobile internet communication, and thus promote social production. And the development of lifestyle.

 Current mobile communication networks are designed for communication between people, such as the determination of network capacity.

 Some of the features that are currently recognized for MTC communication are:

 - MTC terminals (or M2M terminals) have low mobility;

 - The time for data transmission between the MTC terminal and the network side is controllable; that is, the MTC terminal can only access during the time period specified by the network;

 - The data transmission performed by the MTC network and the network side is not required for real-time data transmission, that is: time-tolerant;

 - MTC terminal energy limited > requires very low power consumption;

 - only small amount of information transmission between the MTC terminal and the network side;

- MTC terminals can be managed in groups of ₄

An actual MTC terminal may have one or more of the above characteristics The existing UTE system bandwidth has the following types shown in Table 1.

■Φ 1

 Before 3⁄4, there are three types of LT.E downlink resource allocation: Resource allocation type

0/1/2.

 Resource allocation type 0 f, resource allocation type 0), the available RBG (Resource Block Group) in the system bandwidth, each RBG consists of P consecutive VRBs (Viilual Resource Block) oinocalized type, P The size is determined by the system bandwidth: Number of groups of RBG^

 The PDCCH (Physical Downlink Control Channel) uses bits to indicate whether each RBG is occupied by using btenap, as shown in Table 2.

 . ί

Resource aiiocatioii typeO divides resources into RBGs in the same way. Further, /V _RBQ RBG ^ is P subsets, and RBG subset p corresponds to RBG with interval p as the starting point P ( 0 ≤ p < P } , such as j _¾ eNB shown in FIG via PDCCH: ((physical downlink Control Chamiel , physical downlink Control channel)) indicates RB <3, and a subset of the subset of occupancy wherein VRBs, VRB occupancy use of addressing biti p. The range that can be addressed is part of the bandwidth, starting from (P). There are two possibilities for the value of A _sfl , _s (p), by PDCCH.

1 bit indicates the number of bits occupied by the RB resource indication information on the PDCCH and r^ource Like aJlocation typeO, it also includes:

RBG subset indication, indicated by bits;

 1 bit to indicate whether the offset is: The value is 0 corresponding to the value = the value is

】 Corresponding to _hiS ip) = Ν ^Μ (ρ) ― Ν ^ ^ΈΛ ;

ΝTM ^!Λ bits address the VRB of localized type in the RBG subset,

Α ^Ρ:笫ί i ¹ -^-^ "^{; ί in the Ί} ) bits indicate the RBG group

The ith VRB starting with A _s3⁄4>ij ( ), the corresponding VRB number is:

"VRB P

 In Resource allocation type 2, the FDCCH indication is a continuous loca ed VRB (centralized VRB) or d trilwied VRB (distributed VRB). DCi format 1A/1B/1D has a 1 Wt Locaized/Distribiited VRB assignment flag; when using PC CH DC1 format IC, fixedly allocated distributed VRB. For PDCCH DC1 format IA 】 B or ID, - segment continuous VRB resource allocation Indicated by the resource indication value (MV ) on the PDCCH,

RIV and starting RB f RBstart ) are as follows:

_1Yl , r \~》 ( : & - 1) +

Zhou·TM

1Λ(Λ粮〗-胆胆) Others 'L _ci > I md shall mi exceed N ― RB _;(iarl ί ie L _au > l and no more than 丄

 For the PDCCH DCI format, C, the VRB resource allocation is indicated on the PDCCH in the same manner as above, where U , , 2A3⁄4f

leg,

The mapping source of the uplink and downlink control channels in the existing IXE system is designed based on the system bandwidth, so the working bandwidth of the terminal needs to be at least equal to the operating bandwidth of the system.

ΓΓΕ work order for the network terminal may Έ network bandwidth configuration in a variety of impregnated and the switching travel, the current bandwidth requirements LTE UE (User Equipment, a terminal) is at least _20ΜΉζ;.

 Considering that MTC devices in small-bandwidth system communication will be very large in the future, and in most cases, MTC devices have relatively simple functions and do not require very high transmission rates. Therefore, it is necessary to consider further reducing the cost of MTC devices.

 Bandwidth is an important factor in the cost of MTC equipment. § For the first 3⁄4 system requirements, all terminals must support 20MHz system bandwidth, but if the operating bandwidth of the MTC terminal equipment based on the system can be appropriately reduced, the cost will be significantly reduced but the UE will be reduced. The problem caused by the terminal bandwidth is that the UE cannot effectively read the downlink control channel due to the full bandwidth mapping of the downlink control channel, and the uplink cannot perform PUCCH (Pbysicai UpJiek Control CHanneL physical uplink control stripping channel) on the entire uplink bandwidth. Feedback, so it brings compatibility issues with control channels and coexistence with legacy terminals. Summary of the invention

 Embodiments of the present invention provide a downlink data transmission method and a device thereof, which are used to reduce terminal bandwidth and achieve compatibility of a control channel while reducing terminal cost.

The downlink data transmission method proposed by the embodiment of the present invention is applied to a system, The data domain of the downlink system operating band of the UTE system is configured with at least one downlink data transmission frequency band, and the bandwidth of each downlink data transmission band is smaller than the bandwidth occupied by the UE system control channel region, and the method includes:

 The network device sends control signaling to the terminal through the downlink control channel in the control region of the LTE system, to schedule the terminal to perform downlink data transmission in the downlink data transmission frequency band;

 The network device performs data transmission on the terminal on the downlink data transmission band in the downlink data transmission frequency band.

 A downlink data transmission method according to another embodiment of the present invention is applied to an LTE system, where at least one downlink data transmission frequency band is configured in a data domain of a downlink system operating frequency band of the UTE system, and a bandwidth of each downlink data transmission frequency band is smaller than Ι ..: Έ The system controls the bandwidth occupied by the channel area. The method includes:

 The terminal receives control signaling sent by the network device through a downlink control channel in a control region of the LTE system;

 The terminal receives the downlink data sent by the network device on the downlink data transmission band of the terminal according to the control signaling.

 The network device provided by the embodiment of the present invention is applied to a UE system, where at least one downlink data transmission frequency band is configured in a data domain of a downlink system operating frequency band of the obscured system, and a bandwidth of each downlink data transmission frequency band is less than a system control channel region. The bandwidth occupied, the network equipment includes:

 a transmission control module, configured to send, by using a downlink control channel in the control area of the U'E system, control signaling to the terminal, to schedule the terminal to perform downlink data transmission in the downlink data transmission frequency band;

 a data transmission module, configured to perform data transmission on the terminal in the downlink data transmission band in the downlink data transmission frequency band

The terminal device provided by the embodiment of the present invention is applied to an LJE system, where at least one downlink data transmission frequency band is configured in a data domain of a downlink system operating frequency band, and a bandwidth of each downlink data transmission frequency band is smaller than a system control channel region. The occupied bandwidth, the terminal equipment includes: s a control information acquiring module, configured to receive control signaling sent by the network device by using a downlink control channel in a control region of the LTE system;

 a data transmission module, configured to receive downlink data sent by the network device on a downlink data transmission frequency band of the terminal according to the control signaling

 In the above embodiment of the present invention, downlink data transmission is performed within a full bandwidth of the system, and downlink data transmission is performed within a system bandwidth, and the downlink control channel design compatible with the legacy terminal is maximally required, and the downlink control does not need to be redesigned. Area, reducing the impact on existing specifications while reducing terminal bandwidth

 IS! The schematic diagram of the resource allocation ly e 0& ί in the prior art; FIG. 2 is a schematic flowchart of downlink data transmission according to an embodiment of the present invention;

IS 3 is a schematic flowchart of the downlink data transmission provided by the embodiment of the present invention; FIG. 4 is a schematic structural diagram of a network device according to an embodiment of the present invention;

 FIG. 5 is a schematic structural diagram of a terminal device according to an embodiment of the present invention. detailed description

 The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings and embodiments.

 In order to clarify the implementation principle and technical effect of the implementation of the present invention, the following describes the relevant provisions of the existing PRACH (Physical Rimdom Access Channel) resource location.

In a LTE system, a PRACH channel occupies 6 PRB resources _s with Format 0.3, and the subcarrier spacing is l 25KHz, ! The PRACH channel contains 864 subcarriers (1,08 MHz), and the preamWe (preamble) sequence of length 839 is mapped to the middle 83 subcarriers using Format 4 (only for TDD (Time Division Duplexing) system) When the subcarrier spacing is 7.5 Ήζ, one channel contains 144 subcarriers (i 0 leak-z), and the preamble sequence of length 139 is The time-frequency resources occupied by the PRACH on the 139 subcarriers mapped to the middle are determined by the eNB (evolved Node B, ie, the base station), and the UE is notified by the system message.

 In the LTE-FDD system, because the TYPE1桢 structure is used, the number of uplink subframes in a 10ms radio frame is determined and sufficient, and the PRACH transmission is not limited by the frame structure.

 Ω R ί

In the initiating sub-frame, the PRACH is allowed to be sent in at most one uplink subframe, that is, the PRACH' is distinguished only by the time domain 6, and is not distinguished by the frequency domain. The first index of the physical resource block that can be used for the PRACH is « The parameter " _3⁄4 " is configured by the high-level parameter prach-FrequencyOffset, and the value range is:

0≤= ^η Ρ Β (!ί N _RB —6

 In the TD-IXE system, due to the limitation of the time division duplexing function, different uplink and downlink configurations result in an indeterminate number of uplink sub-numbers in one radio frame and a small number. In order to ensure that the UE transmits PRACH in the case of less uplink sub-frames. Real-time, allows one subframe to send multiple PRACHs, that is, the transmission of PRACH requires time-frequency resource mapping. The time-frequency resource mapping rule is: first allocate in the time domain, if the time domain resources are scarce, then consider placing in the frequency domain. Multiple PRACH. PRACH configuration through a set of parameters (

Indicates that Λ _Α is the frequency resource number used to calculate the frequency domain resource occupancy of the PRACH.

Rea reamble format 0-3: if f» _Λ mod 2 = 0 ottierwsse

 For preamble format 4;

J 6 od 2) x (2 - N _$v ) + )mod 2 0 n A if m

 Otlierwise where is the system frame number, which is the number of switching points of the uplink and downlink subframes in a radio frame.

The PRACH resource of fonnat0~3 allocates resources in order for bilateral mapping. Format 4 is a single side shot _β

 From the above analysis, it can be seen that in the ί. system, the PRACH channel may be distributed on any continuous 6 PRB resources in the system bandwidth.

 After research, IJE's working bandwidth is 20MHz or higher, which has no effect on the RF device cost of the UE, but Α/Ό (A/D), D/A (D/A) converter and baseband processing. The cost of devices such as devices is closely related to the bandwidth. Lowering the bandwidth can effectively reduce the cost of the above devices.

 Based on the above analysis, there are two options for potentially reducing bandwidth before n: Solution ί : How RF reduces bandwidth

 Under this scheme, the terminal uses a narrow bandwidth RF device, such as maximum support.

5MHz bandwidth filter, power amplifier, transceiver, duplexer (or switeli) (The following is a bandwidth of 5MH, z for example λ by using a narrow bandwidth filter, only filtering and picking up a small bandwidth terminal The useful signal in the bandwidth reduces the need for the cache. After reducing the bandwidth, the sampling rate requirement of the AD/DA converter is also reduced under the premise of fully satisfying the M23V! communication rate and delay requirement; and the baseband processing part The FFT (Fast Fourier) transform, channel estimation, channel equalization and signal detection, and HARQ (Hybrid Automatic Repeat Request) processing are also effectively reduced as the bandwidth is reduced, further reducing the baseband processing of the UE. Device signal processing speed and the need for HAR.Q cache devices, thereby effectively reducing costs.

Solution 2: The radio frequency bandwidth is not reduced, and the bandwidth of the baseband processing part is reduced. Since the bandwidth has no impact on the cost of the radio part of the UE, the solution proposes not to reduce the bandwidth of the UE radio frequency device, and only reduce the bandwidth of the UE baseband processing part, that is, reduce the bandwidth. The bandwidth of the AD/DA converter, FFT transform > channel estimation, channel equalization, and signal detection, and HARQ processing, the scheme can basically obtain the approximate cost reduction effect of the scheme. Enhanced program, that is, hope to obtain The frequency selection gain of the downlink scheduling. If so, the Subframe buffer size, the AD sampling bandwidth, and the FFT Size of the terminal cannot reduce the working bandwidth, so that there is a certain cost increase compared with the scheme 1.

 Although the scheme 1 can effectively reduce the cost of the terminal, there are some significant disadvantages:

 (1) The downlink control channel and the uplink control channel are not compatible with the existing ITE system;

(2) If the uplink control channel is designed separately, one possible solution is to design the uplink feedback channel according to the design method of the existing IE uplink PUCCH in the small bandwidth band, but this method will bring serious resource fragmentation problems to the traditional terminal. When a small bandwidth terminal exists in the system, the traditional ITB UE (the traditional terminal needs to have a single carrier transmission and emission characteristic) cannot configure the full bandwidth resource for service transmission, so that a high peak rate cannot be obtained;

(3) Because the existing ΟΈ standard specifies the location of the PRACH resource, it can appear anywhere in the uplink frequency band of the system. After the bandwidth is reduced, the uplink PRACH transmission of the terminal cannot be designed based on existing standards, and there is compatibility problem.

 Although the cost of the terminal can be effectively reduced in the above scheme 2, there are also obvious disadvantages, which are divided into the following two cases:

 Case A: Regardless of the frequency selective gain, the cost reduction effect similar to that of the scheme 1 can be basically obtained, but in this case, the disadvantage of the scheme is similar to the scheme ί:

(1) The downlink control channel and the uplink control channel are incompatible with the existing U'E system; (2) If the uplink control channel is separately designed for such a scheme, one possible solution is to follow the existing LJE uplink PUCCH in the small bandwidth band. The design method is used for the uplink feedback channel design. However, this method can cause serious resource fragmentation problems in the traditional terminal. When a small bandwidth terminal exists in the system, the traditional UTE UE (the traditional terminal needs to have a single carrier transmission feature) cannot configure the full bandwidth resource for service transmission, and thus cannot Obtain a higher peak rate; (3) Since the existing UTE standard stipulates the location of the PRACH record, it can appear anywhere in the uplink frequency band of the system. After the bandwidth is reduced, the uplink PRACH transmission of the terminal cannot be based on the existing standard, and there is a compatibility problem.

 Case B: In the case of considering the frequency selective gain, the sampling rate, Subframe buffer size, FFT Size, etc. of the AD/DA sampler cannot be further reduced, so the disadvantages of this method include:

 (1) There is a significant increase in the cost compared to Option 1 > In particular, the cost of Subframe cannot be effectively reduced;

 (2) Downlink control channel compatibility problem. Still exists;

 (3) Subframe cache cannot be effectively reduced.

 In order to solve the above problem, the embodiment of the present invention provides a downlink data transmission scheme to reduce terminal bandwidth. In this scheme, the RF (radio frequency) part does not reduce the bandwidth, and the downlink system control area does not reduce the reception bandwidth, and only reduces the bandwidth for the data baseband processing part.

The embodiments of the present invention are described in detail below with reference to the accompanying drawings _:

Taking the LE system as an example, the downlink data transmission process provided by the embodiment of the present invention can be as shown in FIG. 2 from the network side. The network device in the process is usually an e B ₅ terminal refers to a small bandwidth terminal, that is, a terminal whose bandwidth is smaller than the bandwidth of the LJE system, such as an MTC terminal. The system has at least one downlink data in the data domain of the downlink system operating band. The transmission frequency band, and the bandwidth of each downlink data transmission frequency band is less than 1: 带宽 The bandwidth occupied by the system control channel region, where the system control region refers to the symbol occupied by the PDCCH channel in the LTE subframe, and the system data region refers to the PDCCH in the LIE subframe. Other symbols outside the symbol occupied by the channel may include:

Step 200: The eNB sends the downlink data transmission frequency band information (including the frequency point location and the bandwidth) of the terminal to the terminal by sending signaling to the terminal. Of course, the terminal and the network side may also pre-agreed the downlink data transmission band information. So that the network device can It is not necessary to notify the terminal of its downlink data transmission band information by signaling.

 Step 20: The cNB sends control signaling to the terminal through the downlink control channel in the U'E system control area, to schedule the UE to perform downlink data transmission in the downlink data transmission frequency band;

 Step 202: The eNB performs data transmission on the terminal in the downlink data transmission frequency band in the downlink data transmission frequency band.

 When the network device schedules the terminal, the frequency resource indicated by the resource indication bit in the downlink control channel is within the operating bandwidth of the entire system or limited to the downlink data transmission frequency band.

 The embodiment of the present invention does not reduce the bandwidth of the R1F part, so the transmission mechanism of the existing downlink control channel can be used, that is, the eNB transmits the downlink control channel of the terminal within the bandwidth occupied by the ϋΓΕ system control area „ UTE system control area The bandwidth range can be the operating bandwidth of the LTE system.

Because the bandwidth of the downlink data transmission signal of the terminal is reduced in the embodiment of the present invention, the terminal needs to know the downlink number. According to the transmission frequency band information (that is, the frequency information occupied by the downlink data transmission, including the frequency point location, the bandwidth size, etc.), The frequency band position and bandwidth information of the downlink data transmission frequency band of the downlink data received by the corresponding frequency band may be agreed in advance between the network and the terminal side, or may be notified by the network side (such as the eNB) to the downlink data transmission of the terminal. The frequency range of the bandwidth (that is, the frequency range of the downlink data scheduling, such as the 3PRB range, the service scheduling of each terminal falls within this frequency range. λ Since the LTE system can adopt the same-frequency networking mode, there is a neighboring cell with the same frequency interference. In different time periods, the frequency interference of each frequency subband in the UTE system operating band may be different, so there is a need for neighbor cell interference coordination. Therefore, the frequency position of data transmission is in the LTE system. The position in the bandwidth has a demand that changes with time, so the downlink data transmission The band information may change. In the case that the frequency side of the bandwidth of the downlink data transmission is notified by the network side, when the downlink data transmission frequency band changes, the network processing process further includes the following steps:

 Step 203: The eNB notifies the terminal of the downlink data transmission band change information by using signaling.

 It should be noted that, in actual applications, the downlink data transmission process performed by the eNB does not have strict timing requirements. For example, the eNB may perform downlink data multiple times after the terminal accesses the system and sends the downlink control channel to the terminal. The data transmission is performed on the terminal in the transmission frequency band; for example, the downlink data transmission frequency band change may occur multiple times, and for each change, the eNB shall notify the terminal of the downlink data transmission frequency band change information by signaling, The eNB may indicate the frequency resource range of the bandwidth of the downlink data transmission of the terminal in the following manner:

 Mode]: PDCCH indication mode of public configuration

 In this manner, the eNB informs the terminal of the downlink through the PDCCH of the common search space of the downlink control channel: the frequency information of the downlink data transmission may include the frequency location, the bandwidth, and the like.

 Further, in order to distinguish between the small bandwidth terminal and the traditional UTE terminal, the terminal may be assigned a public R TI (Radio Network: Temporary Identifier), which is recorded as an MR TL, and an M-RNT1 may be configured for all terminals according to requirements. In this way, all the terminals are configured to operate at one frequency point; different terminals can be configured for different frequency positions or/and bandwidths. (Normally, the same type of terminal uses the same frequency and bandwidth, and the network can use small bandwidth according to certain rules. The terminal classifies, for example, according to the bandwidth size or capability level, for example, M-RNT!~ .

M-RNT1-2, M-NTI-n, where the downlink data transmission frequency resources corresponding to each RNTI are the same, so that different types of terminal ray can be configured at corresponding frequency positions (with The width can also be different) for service transmission

 In order to save the resources occupied by the PDCCH signaling, the PDCCH signaling may be configured in a periodic configuration manner, and the PDCCH signaling period and the radio frame, subframe, and the like may be agreed in the standard; The configuration information of the JPDCCH signaling is notified to the terminal by broadcast signaling through the network side.

Mode 2: The BCH (Broadcasting Channel) notification mode network can configure one or more small bandwidth transmission bands in the data domain of the LTE system bandwidth, and can notify the terminal to downlink in the PBCH (Physical Broadcast Channel) channel. Frequency information occupied by digital transmission, including frequency location and bandwidth size. The network classifies small bandwidth terminals by certain rules (such as classification according to bandwidth size or capability level), and notifies each type in the PBCH according to the category of the terminal. downlink data transmission band information _terminal:: specific network equipment in accordance with the agreed order of downlink data transmission band bit information (frequency band position of bandwidth) of the PBCH channel map indicates various types of terminals further save the number of bits, the network prior to the terminal First, each number is agreed. According to information such as the frequency band position of the transmission, the bandwidth size, and the data frequency point number, the network only maps the bits indicating the number of the downlink data transmission frequency band used by each type of terminal in the PBCH in accordance with the agreed order.

 A specific implementation manner is: adding the foregoing indication information (that is, the frequency information occupied by the downlink data transmission) to the reserved bits of the existing PBCH channel; the other manner is: separately setting a new PBCH channel for the terminal to bear The above indication information (that is, the frequency information of the downlink data transmission λ, if a new PBCH channel is adopted, the PBCH transmission mechanism, such as resource mapping, period, etc., can use the existing mechanism. After the terminal obtains the lost information, The operation is consistent with the way, and it is no longer mentioned here.

In the process shown in FIG. 2, the eNB may notify the terminal of the frequency band change information of the downlink data transmission by: Mode 1: The eNB uses the system message update i»L system notification

 In this mode, when the downlink data transmission band information (such as the frequency point indication information) carried by the PDCCH channel or the PBCH channel changes, the network notifies the terminal by using a system message update mechanism, and sends a paging indication that the system message changes to the terminal. Informing the terminal to read the updated PDCCH channel or PBCH channel to reduce the impact on the existing H2H terminal, the paging message may be separately sent for the M2M terminal town, for example, using the terminal-specific P-RNT [scrambling]

 Mode 2: eNB uses PDCCH order notification

 For the terminal of the ongoing service transmission, the eNB may use the manner of transmitting the terminal-specific PDCCH order in the terminal-specific space to notify the terminal of the downlink number of transmissions of the changed frequency band information in a timely manner; the eNB uses the PDCCH order (command) to notify the terminal of the frequency band change. The method includes: the eNB carries the updated frequency band information (such as the frequency point location, the bandwidth size) in the PDCCH order command, or the eNB instructs the terminal to read the channel that carries the frequency band information of the downlink data transmission by using the PDCCH order command (eg, The foregoing PDCCH channel or BCH channel) is used to retrieve frequency band information of the updated downlink data transmission.

 Mode 3: The eNB uses the PDCCH notification

For the terminal that is transmitting the service, the eNB may use the manner of transmitting the terminal-specific PDCCH in the terminal-specific space to notify the terminal of the frequency band change information of the downlink data transmission in a timely manner. Specifically, the eNB may add some PDCCH signaling to the terminal for scheduling. The bit indication is used to indicate the downlink #: according to the transmitted band change information, and the method for indicating the bit includes, but is not limited to, the Mtmaj indication mode using the frequency point or the v'aiueiag indication mode. The BiteBiap is a bit sequence, and the bitemap indication manner is: The working frequency corresponds to a bit in the sequence. If the eNB sets the bit to "1", it indicates that the terminal downlink traffic transmission will transmit alueiag as the count value in the frequency band corresponding to the bit, and the method indicated by the valuetag refers to: eNB For the scheduling of the terminal, every time the frequency is changed, vaiueiag indicates If the value of the data transmission is changed according to the indication of the vaiuetag, the terminal needs to read back the channel carrying the downlink data transmission. The PDCCH channel or the BCH channel as described above is used to further acquire the frequency band information of the changed downlink data. Mode 4: The eMB uses the signaling terminal carried by the PDSCH (Physical Downlink Shared Channel * Physical Downlink Shared Channel)

 The signaling carrying the frequency point change information is transmitted in the PDSCH channel, and the specific information may include: a target frequency point and an effective time information, that is, a specific switching time point (radio frame, subframe) of the network switching frequency point for data transmission. Then, when the handover time point is reached, the terminal only samples and stores the data of the standard frequency band for subsequent processing.

 Taking the LTE system as an example, corresponding to the processing flow of the network side, from the perspective of the I end, the downlink data transmission process provided by the embodiment of the present invention may be as shown in FIG. 3 . The process can include:

 Step 300: The terminal acquires downlink data transmission frequency band information according to signaling sent by the network device (including frequency location and bandwidth λ. Of course, the downlink data transmission frequency band information may also be pre-agreed between the terminal and the network side, so that the network is configured and prepared. It is not necessary to notify the terminal of its downlink data transmission band information by signaling.

 Step 30.1 > Terminal receiving network The control signaling sent by the downlink control channel in the control area of the LTE system is prepared.

 Step 302: The terminal receives the downlink data sent by the network device on the downlink data transmission frequency band of the terminal according to the control signaling.

In a specific implementation, the terminal reads the PCFICH (Physical Control Format Indicator Channel) to obtain the number of symbols occupied by the downlink control region, and only uses the full bandwidth of the control region to ensure the control channel. Performance, after the symbol of the data area is sampled, the pilot data in the data can be selected. Sexual reception, based on the pilot of the control region and combined with the pilot sequence of the data region to perform channel estimation of the control region, and based on the channel estimation result interpolation, calculate the final result of the channel estimation in the control region symbol, and perform downlink control channel based on this Full bandwidth (ie Έ system operating bandwidth) detection processing

 When receiving the downlink data, the terminal first performs the whole system bandwidth range data sampling and performs FFT processing, and then reads the sampling data in the corresponding bandwidth range according to the frequency band information of the downlink data transmission and puts it into the buffer for subsequent baseband processing, and the like. Data in the bandwidth is directly discarded, which effectively reduces the need for the Subframe buffer of the terminal. The downlink data transmission band information (including the frequency location and bandwidth) may be in accordance with the network reverse agreement in advance, or may be received through the receiving network side. The signaling obtained by the sending, for example, according to the signaling of the downlink data transmission frequency band information detected by the downlink control channel detection process in the full bandwidth range, obtains the downlink data transmission band information.

 Since the IXE system can adopt the same-frequency networking mode, there are different frequency segments in the operating band of the Έ system in different time periods in the operating frequency band of the neighboring system. Therefore, there may be neighbors in the same frequency interference. The demand for cell interference coordination, the position of the frequency position of the M2M data transmission in the bandwidth of the U'E system has a time-varying demand, and the frequency band information of the downlink data transmission may change, and thus may further include the following steps. :

 Step 303: The terminal obtains the downlink data transmission band change information, and obtains downlink data transmission band change information according to the obtained downlink data transmission band change information, and performs downlink data transmission on the updated downlink data transmission frequency band.

It should be noted that, in practical applications, the downlink data transmission process performed by the terminal does not have strict timing requirements. For example, the terminal may receive the data transmission on the network side in the downlink data transmission frequency band multiple times after accessing the system and reading the downlink control channel; for example, the downlink data transmission frequency band change may occur multiple times, for Every time you change, The terminal must adjust the frequency band of the downlink data transmission.

 Corresponding to the process in FIG. 2, the eNB indicates the manner in which the terminal downlink data is transmitted in the frequency resource range of the bandwidth. In the process shown in FIG. 3, the terminal can obtain the frequency band information of the downlink data transmission by using the following manner:

 Mode i: PDCCH indication mode of public configuration

The terminal searches for the PDCCH in the common search space of the downlink control channel, and obtains the frequency band information of the downlink data transmission carried therein. In the case that the PDCCH is scrambled by the terminal RNTi, the terminal uses the M-RNTI allocated to it (for example, using the M-RTT1 corresponding to the type of the terminal) to descramble the PDCCH. If the PDCCH can be correctly parsed, the terminal carries the PDCCH. Downstream data transmission band information, otherwise, the device that discards the read PDCCH signal can perform PDCCH search according to the configuration information of the DCCH, and the configuration information of the PDCCH can be agreed on the network side and the terminal side in advance, or the terminal broadcasts the broadcast signaling according to the network side. Obtain the configuration information of WXXH _β

 Since the SiB is sampled and scheduled for transmission, it may be scheduled at any frequency position within the bandwidth of the LTE system, so the terminal reads the M-RNT:: information scrambled PDCCH before receiving the SI.B message, thereby acquiring its data transmission (including SiB transmission) The position information of the frequency occupied by the SiB can be collected into the biif&r at the frequency position where the SiB information may appear, waiting for the next detection and the like.

 Method 2: BCH pass. Know the way

If the network device indicates the downlink data transmission band information (including the frequency point location and the bandwidth) of each type of terminal in the 3PBCH! channel mapping according to the agreed order, correspondingly, the terminal sends the network device to send in the PBCH channel according to the agreed order. If the network device maps the number of the data transmission frequency band used by each type of terminal in the PBCH according to the agreed order, the terminal receives the network device in the PBCH according to the agreed order. Transmitted in the channel for representation The frequency point position of the downlink data transmission band and the number of the bandwidth, and the corresponding downlink data transmission band information is determined according to the number.

 Corresponding to the manner in which the eNB indicates the frequency band change information of the downlink data transmission of the terminal in the process described in FIG. 2, in the process shown in FIG. 3, the terminal may obtain the updated downlink teaching data transmission frequency band information by the following corresponding manner:

 Manner 1: The terminal receives the paging indication of the system message change sent by the eNB, obtains the updated PDCCH or PBCH according to the indication, and acquires the updated downlink data transmission frequency band information according to the updated PDCCH or PBCE. In the case of R T1 scrambling, the terminal first uses the P~RNT!: descrambled paging indication assigned to it, and if the paging indicator can be parsed, the above processing is performed, otherwise the paging indication mode 2 is discarded: the terminal is After receiving the terminal-specific PDCCH order command, the terminal-specific space obtains the updated downlink data transmission frequency band information according to the PDCCH order command. The specific implementation manner is as follows: The PDCCH orcter command carries the updated downlink data transmission frequency band information, and the PDCCH orcter command carries the updated downlink data transmission frequency band information. In this case, the terminal can directly obtain the updated downlink data transmission frequency band information according to the PDCCH order command. Another specific implementation manner is: the PDCCH order command instructs the terminal to read the channel carrying the downlink data transmission frequency band information (such as the foregoing PDCCH). Channel or BCH channel), in which case the terminal reads according to the indication Corresponding channel, obtaining downlink data transmission frequency band information from the read channel signaling

 Manner 3: After receiving the PDCCH in the terminal-specific space, the terminal acquires the updated downlink data transmission frequency band information according to the PDCCH signaling, > a specific implementation manner is:

The PDCCH signaling carries a bitmap of frequency points, and the terminal uses the frequency point corresponding to the bit whose bit value is "Γ (of course, "0", according to the system convention) as the updated downlink data transmission frequency. Another specific implementation manner is as follows: The PDCCH signaling carries a valuetog of a frequency point, and the terminal determines whether the downlink data transmission frequency band information changes according to whether the vaj tag of the two scheduled scheduling changes before, if the scheduling is performed twice before and after. If the value tag is different, the downlink data transmission band information changes. In this case, the terminal reads back the channel carrying the downlink data transmission band information (such as the foregoing PDCCH channel or BCH channel) to further obtain the changed downlink data transmission band. information

 Manner 4: The terminal receives the PDSCH signaling sent by the eNB, and obtains the updated downlink data carried in the transmission band information.

 In addition, the eNB may not notify the change information of the final downlink data transmission frequency band, and the terminal may self-discover the change of the downlink data transmission frequency band and obtain the updated downlink data transmission frequency band information, and the following manner may be adopted:

 Mode 5: The terminal monitors a channel (such as a PDCCH channel or a PBCH channel) carrying downlink data transmission band information.

 In this mode, the network side does not use other signaling to notify the terminal of the data transmission frequency change information. The terminal monitors according to the PDCCH signaling or the PBCH signaling cycle, so that the downlink data transmission band change information can be obtained at any time.

 Method 6: This method is the optimization scheme of the above mode 5

 After the terminal detects the PDCCH channel or the PBCH channel, the downlink data transmission band information is first acquired, and the channel is no longer detected. In the process of the eNB scheduling the terminal, if the terminal finds a detection error (CRC (Cyclic Redundancy Check) check failure) according to the PDCCH indication, whether the channel is instantaneously deteriorated or the eNB changes the scheduled frequency band, the terminal according to the terminal The configuration of the PDCCH channel or the PBCH channel is read back to the channel to extract whether the downlink data transmission band changes information and the changed downlink data transmission frequency band information mode can reduce the burden on the terminal and the power consumption. .

 Method 7: Final Ray is judged according to PDCCH

For a terminal that is performing service transmission, the eNB may use a manner in which the terminal-specific PDCCH is transmitted in the terminal-specific search space to notify the terminal of the frequency change information in a timely manner. With The network-to-terminal scheduling PRB indication information may be indicated in the range of P. RN (Pseudo Random Noise Code) of the LTB system bandwidth, and the terminal receives the downlink scheduling, and determines that the eNB indicates in the 3PDCCH signaling. The PRB resource range is not in the current number of the terminal. According to the received frequency band, the terminal reads back the upper channel according to the configuration of the PDCCH channel or the PBCH channel to obtain downlink data transmission frequency band information.

 It can be seen from the above description that the solution of the embodiment of the present invention can be compatible with the traditional downlink control channel design, and the downlink control region does not need to be redesigned. , to reduce the impact on the existing specifications; the uplink channel (including the PUCCH channel, PRACH channel) can also be compatible with the traditional LIE terminal, so there is no uplink resource fragmentation and additional uplink control resource occupation. Compared with the potential scheme 2, Embodiments of the present invention can further reduce the cost of subfi'ame

 After the embodiment of the present invention, the frequency of the resources of the terminal is limited to the small bandwidth band. Therefore, when the eNB schedules the terminal, the resource indication bit in the downlink control channel PDCCH may only indicate resources in the small bandwidth band. Since the bandwidth of the frequency band to be indicated is reduced, the resource indication bit overhead can be saved, and the total number of bits of the downlink control channel PDCCH is reduced, thereby improving the transmission performance of the control channel.

Based on the same technical concept, embodiments of the present invention further provides a process may be applied to the above-network equipment and terminal equipment _¾

 FIG. 4 is a schematic structural diagram of a network device according to an embodiment of the present disclosure. The network device may be a base station device. The network device may include:

 The transmission control module 401 is configured to send, by using a downlink control channel in the control area of the UTE system, control signaling to the terminal, to schedule the terminal to perform downlink data transmission in the downlink data transmission frequency band;

a data transmission module 402, configured to: in the downlink data transmission frequency band, the downlink The terminal on the data transmission frequency band performs digital transmission _s

Specifically, the network device and the terminal agree to have the frequency location and bandwidth information of the downlink data transmission band; or, the transmission control module 40! is further configured to transmit the downlink data transmission frequency band by using signaling. frequency and bandwidth information indicating the position to the terminal, wherein the same bandwidth size of each frequency band downlink transmission data #, identical or different portions ₉

 Specifically, the transmission control module 401 may indicate the frequency location and bandwidth information of the downlink data transmission frequency band to the terminal by using PBCH signaling or PDCCH signaling of a common search space of the downlink control channel; where, the transmission control module 401 The frequency location and bandwidth information of the downlink data transmission band may be carried in the existing PBCH signaling or the new PBCH signaling.

 Specifically, the RNTI is configured for different types of terminals according to the type of the terminal used for performing the digital transmission in the downlink data transmission frequency band; correspondingly, the transmission control module 40 may send the PDCCH to the terminal: Before signaling, according to the type of the terminal, using RNTi scrambling transmission configured for the terminal of the type, PDCCH signaling to the terminal

 Specifically, the PDCCH signaling adopts a periodic configuration, and the PDCCH signaling period appears in a downlink radio frame or/and a subframe. Correspondingly, the network setting and the terminal agree to have configuration information of the PDCCH signaling. Or the transmission control module 401 notifies the configuration information of the PDCCH. signaling to the terminal by using broadcast signaling.

 Specifically, the transmission control module 401 can sequentially notify the frequency position and bandwidth information of the downlink data transmission band of each type of terminal in the PBCH channel according to the type of the terminal used for data transmission on the downlink data transmission frequency band.

Specifically, the transmission control module 401 can transmit the frequency location and bandwidth information of the downlink data transmission frequency band of each type of terminal in the PBCH channel according to the agreed order; or, the frequency location of the downlink data transmission frequency band of each type of terminal is pre- Bandwidth mapping to correspond And a transmission sequence between the network device and the terminal; the transmission control module transmits an identifier for indicating a frequency location and a bandwidth of the downlink data transmission frequency band in the PBCH channel according to an agreed order

 Specifically, the transmission control module 401 is further configured to: when the downlink data transmission frequency band changes, notify the terminal of the downlink data transmission frequency band change information by using signaling. Specifically, the transmission control module 401 can notify the terminal of the downlink data transmission band change information by using one of the following methods:

 The method is: sending a paging indication of a system message change to the terminal, to notify the terminal to read an updated channel for carrying downlink data transmission frequency band information, where the channel used for carrying downlink data transmission frequency band information may be a PDCCH channel of a PBCH channel or a common search space, where the frequency point location and bandwidth information of the updated downlink data transmission band are carried;

 Manner 2: Sending a PDCCH orier command to the terminal, where the PDCCH order command carries the frequency location and bandwidth information of the updated downlink teaching transmission band, or the PDCCH order command carries the indication information to indicate The terminal reads the channel for carrying the downlink data transmission band information, and the channel for carrying the downlink data transmission frequency band information may be a PBCH channel or a common search space PDCCH channel, where the updated downlink data transmission frequency band is carried. Frequency and bandwidth information;

 Manner 3: adding a bit indication to the PDCCH signaling that is scheduled by the terminal, to indicate downlink data transmission band change information;

 Manner 4: The signaling carrying the downlink data transmission band change information is transmitted in the PDSCH channel, where the change information includes: target frequency point, effective time information

Specifically, in the foregoing mode 3, the transmission control module 401 carries a bit sequence in the PDCCH signaling that is scheduled by the terminal, where one bit of the bit sequence corresponds to one working frequency point, and when the bit value is a set value When indicating that the downlink data is transmitted in the pair of bits Performing the downlink number on the transmission band; or, scheduling the terminal

The PDCCH signaling carries a count value. The counting value is used by the network device to change the downlink data transmission frequency band according to the count values of the two previous scheduling. And reading a channel for carrying downlink data transmission frequency band information, where the channel for carrying downlink data transmission frequency band information may be a PBCH channel or a PDCCH channel of a common search space, where the updated downlink data transmission frequency band is carried Frequency and bandwidth information

 FIG. 5 is a schematic structural diagram of a terminal device according to an embodiment of the present invention. The terminal may be a small bandwidth terminal, such as an MTC terminal. The terminal device may include: a control information acquiring module 501, configured to receive a network device. Control signaling sent by the ί.: 下行 system control area downlink control channel;

 The data transmission module 502 is configured to receive, according to the control signaling, downlink data sent by the network device on a downlink data transmission frequency band of the terminal.

 Specifically, the terminal and the network device agree to obtain the frequency location and bandwidth information of the downlink data transmission frequency band; or the control information acquiring module 501 is further configured to: Obtaining frequency point location and bandwidth information of the downlink data transmission frequency band, wherein each downlink data transmission frequency band has the same bandwidth, part of the phase: 3⁄4 or not!

 Specifically, the control information acquisition module 50 can obtain the frequency location and bandwidth information of the downlink data transmission frequency band by using the PBCH signaling sent by the network device or the PDCCH signaling of the common search space of the downlink control channel; The network device carries the frequency location and bandwidth information of the downlink data transmission band by extending the existing PBCH signaling or adding PBCH signaling.

Specifically, according to the type of the terminal used for data transmission in the downlink data transmission band, different types of terminals are configured with corresponding RNTIs; corresponding, control information The obtaining module 501 can receive the PDCCH signaling by using the corresponding RNT1 according to the type of the terminal.

 Specifically, the PDCCH signaling adopts a periodic configuration, and the PDCCH signaling period appears in a lower radio frame or/and a subframe; correspondingly, the terminal and the network device agree to have configuration information of the PDCCH signaling, Alternatively, the control information acquiring module 501 may obtain the configuration information of the signaling by using the broadcast signaling sent by the network device. Specifically, the control information acquiring module 50 may receive the network device in the PBCH channel according to a predetermined sequence. Transmitting the frequency location and bandwidth information of the downlink data transmission frequency band corresponding to the type of the terminal to which the terminal belongs; or mapping the frequency location and bandwidth of the downlink data transmission frequency band of each type of terminal into corresponding identifiers, and The network device and the terminal agree to transmit the sequence. The control information obtaining module 501 receives the identifier of the frequency location and bandwidth of the downlink data transmission frequency band sent by the network device in the PBCH channel according to the agreed order. Determining the frequency location and bandwidth information of the corresponding downlink data transmission frequency band according to the identifier

 Specifically, the control information acquiring module 50] and the network device may send a message according to the network device, if the network device indicates the frequency location and bandwidth information of the downlink data transmission frequency band to the terminal by signaling. Obtaining the frequency position and bandwidth information of the updated downlink data transmission frequency band; or, after discovering the change of the downlink data transmission frequency band information, obtaining the updated downlink data transmission frequency band information

 Specifically, the signaling includes 3 PDCCH or PBCH signaling, and the control information acquiring module 50. The method for obtaining the updated downlink data transmission band information by using the signaling sent by the network device includes one of the following:

Method 1: According to the paging indication that the network device changes the system message sent by the terminal, reading the updated channel for carrying the downlink education transmission band information, and acquiring The frequency point location and bandwidth information of the updated downlink data transmission frequency band carried therein; the channel used for carrying the downlink data transmission frequency band information may be a PDCCH channel of a channel or a common search space;

 Manipula 2: receiving a PDCCH order command sent by the network device, acquiring frequency location and bandwidth information of the updated downlink data transmission frequency band carried therein; or extracting indication information carried therein for reading according to the indication information The channel carrying the downlink data transmission band information, where the channel for carrying the downlink data transmission band information may be a PBCH channel or a PDCCH channel of a common search space, where the frequency position and bandwidth of the updated downlink data transmission band are carried. Information

 Manner 3: According to the bit indication added by the network device in the PDCCH signaling scheduled by the terminal, the frequency location and bandwidth information of the updated downlink data transmission frequency band;

 Method 4: Acquire, according to signaling of the downlink data transmission band change information transmitted by the network device in the PDSCH channel, frequency position and bandwidth information of the updated downlink data transmission frequency band, where the change information includes: a target frequency point, Effective time information

 Specifically, the control information acquiring module 50 is specifically configured to: receive, by the network device, PDCCH signaling that is sent when the terminal device performs scheduling, where the signaling carries a bit sequence, and one of the bit sequences The bit corresponds to a working frequency point, and the terminal uses the frequency position and the bandwidth of the downlink number 椐 transmission frequency band corresponding to the bit of the set value in the bit sequence as the updated downlink number. According to the frequency position of the transmission frequency band and Bandwidth information;

 Or receiving, sending, by the network device, when scheduling the terminal

The PDCCH signaling, the signaling carries a count value, where the network device adds 1 to the scheduling of the terminal every time the downlink data transmission frequency band is replaced; the control information acquisition module is scheduled according to the previous and the second scheduling. Whether the count value changes to determine whether the downlink data transmission frequency has changed, and if it is determined that the downlink data transmission frequency band changes, the reading is performed. The channel carrying the downlink data transmission frequency band information is used to obtain the frequency location and bandwidth information of the updated downlink data transmission frequency band carried therein, and the channel for carrying the downlink data transmission frequency band information may be a PBCH channel or a common search space. The PDCCH channel control information acquiring module 501 can discover the downlink data transmission frequency band information change by itself and obtain the updated downlink data transmission frequency band information by:

 Manner 5: The channel position and bandwidth information of the updated downlink data transmission frequency band carried in the signaling of the channel are obtained by detecting a channel for carrying downlink data transmission frequency band information;

 Manner 6: after the channel position and bandwidth information of the downlink data transmission band are first captured from the channel for carrying the downlink data transmission band information, the channel for carrying the downlink data transmission band information is no longer detected; The network device is in the process of scheduling

When the PDCCH indicates that the detection fails, the channel used to carry the downlink data transmission frequency band information is read to obtain the frequency location and bandwidth information of the updated downlink data transmission frequency band carried therein;

 Manner 7: reading, according to the PDCCH signaling sent by the network device, that the PRB resource range indicated by the discovery signaling is not in the current downlink number transmission band of the terminal, reading a channel for carrying downlink data transmission frequency band information And obtaining the frequency location and bandwidth information of the updated downlink data transmission band carried therein.

 The above-mentioned frequency band information channel for carrying downlink data transmission may be a PBCH channel or a PDCCH channel of a common search space.

 It will be understood by those skilled in the art that the modules in the implemented device may be described in accordance with the embodiments. The devices distributed in the actual example may also be correspondingly changed. The above embodiments are different from the one or more devices different from the embodiment. Modules can be combined into one module, or they can be further split into multiple sub-modules.

Through the description of the above embodiments, those skilled in the art can clearly understand The invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is a better implementation based on such understanding. ₅ The technical solution of the present invention is essentially or right now. The portion of the technology contribution can be embodied in the form of a software product stored in a storage medium, including instructions for causing a computer device (which can be a personal computer, server, or network device) Etc.) performing the methods described in the various embodiments of the present invention

 The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make improvements and retouching improvements and retouching without departing from the principles of the present invention. Should be regarded as the scope of protection of the present invention,

Claims

Rights request

1 . A downlink data transmission method, applied to a long-term evolution system, characterized in that at least one downlink data transmission frequency band and bandwidth of each downlink data transmission frequency band are configured in a number domain of a downlink system operating frequency band of the lost system Less than the bandwidth occupied by the control channel area of the UTE system, the method includes:

 The network device sends control signaling to the terminal through the downlink control channel in the system control area, to schedule the terminal to perform downlink data transmission in the downlink data transmission frequency band;

 The network device performs data transmission on the downlink data transmission band in the downlink data transmission frequency band

 2. The method according to claim 1, wherein the network device and the terminal agree to obtain a frequency location and bandwidth information of a downlink data# transmission band; or, the network device passes The signaling indicates the frequency location and the bandwidth information of the downlink data transmission frequency band to the terminal, where the bandwidth of each downlink data transmission frequency band is the same, partially the same or different

 3. The method according to claim 2, wherein the network device indicates, by signaling, a frequency point location and bandwidth information of a downlink data transmission frequency band to the terminal, a packet,

 The network device indicates, by the physical broadcast channel PBCH signaling or the physical downlink control channel PDCCH signaling of the common search space of the downlink control channel, the frequency location and bandwidth information of the downlink data transmission frequency band to the terminal; The network device carries the frequency location and bandwidth information of the downlink data transmission band by extending the existing PBCH signaling or adding PBCH signaling.

 The method according to claim 3, wherein the RNTi is configured for different types of terminals according to the type of the terminal for data transmission in the data transmission frequency band;

Before the network device sends the MXXH signaling to the terminal, the method further includes: sending, according to the type of the terminal, RNT1 configured for the terminal of the type to the terminal PDCCH signaling

 The method according to claim 3, wherein the PDCCH signaling adopts a periodic configuration, and the PDCCH signaling period occurs in a downlink radio 桢 or/and a subframe; the network device and the terminal agree Having the configuration information of the PDCCH signaling, or the network device notifying the configuration information of the JOCCH signaling to the terminal by broadcast signaling

 The method of claim 3, wherein the network device indicates the frequency location and bandwidth information of the downlink data transmission frequency band to the terminal by using PBCH signaling, including:

 The network device is configured to notify the type of the terminal that performs data transmission on the downlink number t transmission frequency band, and sequentially informs the frequency point position and bandwidth information of the downlink data transmission frequency band of each type of terminal in the channel.

 The method according to claim 6, wherein the frequency location and bandwidth information of the downlink data transmission band of each type of terminal are sequentially notified in the PBCH channel, including:

 The network device transmits the frequency location and bandwidth information of the downlink data transmission frequency band of each type of terminal in the PBCH channel according to an agreed order;

 Or, the frequency location and the bandwidth of the downlink data transmission frequency band of each type of terminal are mapped into corresponding identifiers, and a transmission sequence is agreed between the network device and the terminal; An identifier for indicating the frequency position and bandwidth of the downlink data transmission band is transmitted in the PBCH. channel.

 The method according to claim 2, wherein, in the case that the network device indicates the frequency point location and bandwidth information of the downlink data transmission frequency band to the terminal by signaling, the method further includes :

 When the downlink data transmission frequency band changes, the network device notifies the terminal of the downlink data transmission frequency band change information by using signaling

 The method according to claim 8, wherein the network device notifies the terminal of the downlink data transmission band change information by using the signaling, including:

Sending, by the network device, a paging indication that the system message changes to the terminal, to notify The terminal reads the updated channel for carrying the downlink data transmission frequency band information; or the network device sends a PDCCH order command to the terminal, where the PDCCH order command carries the updated downlink data transmission frequency band. The frequency point location and the bandwidth information, or the PDCCH order command carries the indication information, to instruct the terminal to read the updated channel for carrying the downlink data transmission frequency band information;

 Or the network device adds a bit indication to the PDCCH signaling scheduled to be scheduled by the terminal to indicate downlink data transmission band change information;

 Alternatively, the network device transmits the signaling carrying the downlink data transmission band change information in the physical downlink shared channel PDSCH channel, where the change information includes: II standard frequency point, effective time information

 The method according to claim 9, wherein: the network device adds a bit indication to the PDCCH signaling that is scheduled by the terminal, to indicate the downlink teaching transmission band change information, including:

 The network device carries a bit sequence in the PDCCH signaling that is scheduled by the terminal, where one bit of the bit sequence corresponds to one working frequency point, and when the bit value is a set value, it indicates that the downlink data transmission corresponds to the bit. The downlink data transmission frequency band is performed on the downlink data transmission frequency band; or, the network device carries a count value in the PDCCH signaling that is scheduled by the network device, where the network device performs a downlink data transmission frequency band for the scheduling of the terminal, Then, the count value is incremented by one, so that the terminal reads the channel for carrying the downlink data transmission frequency band information, and carries the updated downlink, when determining that the downlink data transmission band changes according to the count values of the two previous scheduling. Frequency and bandwidth information of the digital transmission band

The method according to claim 9 or 10, wherein the channel for carrying downlink data transmission band information comprises: a PBCH channel or a PDCCH channel of a common search space.

 12. The method according to claim, wherein when the network device schedules the terminal, the frequency resource range indicated by the resource indication bit in the downlink control channel is within the working bandwidth of the entire LJE system or is limited to The downlink data transmission frequency band.

13. The method according to any one of claims 1-10, 12, wherein The bandwidth occupied by the system control area is the operating bandwidth of the UTE system.

 A downlink data transmission method, which is applied to a long-term evolution LTE system, characterized in that: in the data domain of a downlink system operating frequency band of the LTE system, at least one downlink data transmission band is configured, and each downlink data transmission frequency band is configured. The bandwidth is less than the bandwidth occupied by the system control channel area. The method includes:

 The terminal receives control signaling sent by the network device through the downlink control channel in the system control area;

 The terminal receives downlink data sent by the network device on the downlink data transmission frequency band of the terminal according to the control signaling.

The method according to claim 14, wherein the terminal and the network device agree to have frequency point location and bandwidth information of the downlink data transmission frequency band; or, the terminal according to the network Di signaling device takes the transmitted downlink frequency bandwidth information and the position data transmission band, wherein each of the downlink data transmission bandwidth of the band of the same size, the same or different portions of _¾

 The method according to claim 5, wherein the terminal acquires the frequency location and bandwidth information of the downlink data transmission frequency band according to the signaling sent by the network device, including:

 The terminal acquires frequency point location and bandwidth information of the downlink data transmission frequency band according to the PBCH signaling sent by the network device or the PDCCH of the common search space of the downlink control channel, where the network device extends the existing PBCH signaling by Or add PBCH signaling, which carries the frequency location and bandwidth information of the downlink data transmission band.

 The method according to claim 16, wherein: according to the type of the terminal for performing data transmission in the downlink data transmission frequency band, a corresponding RN'n is configured for different types of terminals;

 The terminal receives the 信令 signaling by using a corresponding RNTi according to its type.

The method according to claim 16, wherein the PDCCH signaling adopts a periodic configuration, and the WXXH signaling period occurs in a downlink radio frame or/and a subframe; The terminal and the network device agree to the configuration information of the PDCCH signaling, or the terminal obtains the broadcast signaling sent by the network device.

Signaling configuration information.

 The method of claim 16, wherein the terminal acquires the frequency location and bandwidth information of the downlink data transmission frequency band according to the PBCH signaling sent by the network device, including:

 Receiving, according to a predetermined frequency sequence, a frequency location and bandwidth information of a downlink data transmission frequency band corresponding to a type of the terminal to which the network device transmits in the PBCH channel;

Or, the frequency location and bandwidth of the downlink transmission band of each type of terminal are mapped into corresponding identifiers _f and the transmission sequence is agreed between the network device and the terminal; the terminal receives the fascination according to the agreed order. The network 13⁄4 is provided with an identifier for indicating the frequency position and bandwidth of the downlink data #transmission band transmitted in the PBCH channel, and the root identifier identifies the frequency position and bandwidth information of the corresponding downlink data transmission frequency band.

 20. The method of claim 5, further comprising:

 When the network device indicates the frequency location and bandwidth information of the downlink data transmission band to the terminal by signaling, the terminal obtains the updated information according to the signaling sent by the network device. The frequency location and bandwidth information of the downlink data transmission frequency band; or, after the terminal discovers the downlink data transmission frequency band information, the terminal obtains the updated downlink data transmission frequency band information.

The method of claim 20, wherein the terminal acquires the updated downlink data transmission frequency band information according to the signaling sent by the network device, including: the terminal according to the network device And a paging indicator for changing the system message sent by the terminal, reading the updated channel for carrying the downlink data transmission frequency band information, and acquiring the frequency location and bandwidth information of the updated downlink data transmission frequency band carried therein; or The terminal device receives the PDCCH order command sent by the network device, acquires the frequency location and bandwidth information of the updated downlink data transmission frequency band carried in the terminal device, or obtains the indication information carried therein, and reads the indication information according to the indication information. Taking a channel for carrying downlink data transmission band information; Or the terminal according to the network device by scheduling the terminal

The bit added in the PDCCH signaling indicates that the frequency location and bandwidth information of the updated downlink data transmission frequency band are obtained;

 Or the terminal obtains frequency location and bandwidth information of the updated downlink data transmission frequency band according to signaling of the downlink data transmission frequency band change information transmitted by the network device in the PDSCH channel, where the change information includes: target frequency Point, effective time information

The method according to claim 21, wherein the terminal acquires the updated downlink data transmission frequency band according to the bit indication added by the network device in the PDCCH signaling scheduled by the terminal. Frequency location and bandwidth information, including:

 The terminal receives the PDCCH signaling that is sent by the network device when scheduling the terminal, where the signaling carries a bit sequence, and one bit of the bit sequence corresponds to a working frequency point, and the terminal will a frequency point position and a bandwidth of a downlink data transmission frequency band corresponding to the bit of the set value in the bit sequence as a frequency point position and bandwidth information of the updated downlink data transmission frequency band;

 Or, the terminal receives the PDCCH signaling that is sent by the network device when scheduling the terminal, where the signaling carries a count value, where the network backup prepares the terminal for each downlink number of times. In the transmission band, the count value is added. The terminal determines whether the downlink data transmission frequency changes according to whether the count value of the two previous scheduling changes. If it is determined that the downlink data transmission frequency band changes, the read is used to carry the downlink. a channel for transmitting frequency band information to obtain frequency position and bandwidth information of an updated downlink data transmission band carried therein

 The method according to claim 20, wherein the terminal automatically obtains the updated downlink data transmission frequency band information after the downlink data transmission frequency band information is changed, and the terminal includes:

 The terminal detects the channel for carrying the downlink data transmission band information, and obtains the frequency position and bandwidth information of the updated downlink data #transmission band carried in the signaling of the 3⁄4 channel;

Or the terminal is initially obtained from a channel for carrying downlink data transmission frequency band information. After the frequency location and the bandwidth information of the downlink data transmission frequency band are obtained, the channel for carrying the downlink data transmission frequency band information is not detected; when the terminal fails to detect the PDCCH in the scheduling process of the network device And reading the channel for carrying the downlink data transmission band information to extract the frequency location and bandwidth information of the updated downlink data transmission frequency band carried therein;

 Or, the terminal, according to the PDCCH signaling sent by the network device, is configured to read the downlink data transmission frequency band information when the PRB resource range indicated by the signaling is not in the current downlink data transmission frequency band of the terminal. Channel, and obtaining frequency location and bandwidth information of the updated downlink data transmission frequency band carried therein;

 The method according to any one of claims 21 to 23, wherein the frequency band information channel for carrying downlink data transmission comprises: a channel or a PDCCH channel of a common search space.

 The method according to claim 4, wherein when the network device schedules the terminal 4f, the frequency resource range indicated by the resource indication bit in the downlink control channel is working in the entire system. Within the bandwidth or limited to the downlink data transmission frequency band.

 The method according to any one of the preceding claims, wherein the system control channel area occupies a bandwidth of 1.: ΓΕ system operating bandwidth.

 27. A network device, applied to an LTE system, is characterized in that: at least one downlink data transmission frequency band is configured in a data domain of a downlink system operating frequency band of the LIE system, and a bandwidth of each downlink data transmission frequency band is smaller than an LTE system control. The bandwidth occupied by the channel area, the network device includes:

 a transmission control module, configured to send, by using a downlink control channel in the system control area, control signaling to the terminal, to schedule the terminal to perform downlink data transmission in the downlink data transmission frequency band;

 a data transmission module, configured to perform data transmission on the terminal in the downlink data transmission band in the downlink data transmission frequency band

The network device according to claim 27, wherein a frequency point position and a bandwidth of the downlink data transmission band are agreed between the network device and the terminal Information

 Or the transmission control module is further configured to: indicate, by using signaling, a frequency point location and bandwidth information of the downlink data transmission frequency band to the terminal, where the bandwidth of each downlink data transmission frequency band is the same, partially the same, or different.

 The network device according to claim 28, wherein the transmission control module is configured to: use a PDCCH signaling of a common search space of the PBCH signaling or the downlink control channel to set a frequency position of the downlink data transmission frequency band And the bandwidth information is indicated to the terminal; wherein, the transmission control module carries the frequency location and bandwidth information of the downlink data transmission frequency band by extending existing PBCH signaling or adding PBCH signaling

 The network device according to claim 29, wherein a type of terminal used for data transmission in the downlink data transmission band is configured, and a corresponding RNT is configured for different types of terminals:

 The transmission control module is further configured to: before transmitting the PDCCH signaling to the terminal, perform PDCCH signaling sent to the terminal by using RNTi configured for the terminal of the type according to the type of the terminal.

 The network device according to claim 29, wherein the PDCCH signaling adopts a periodic configuration, and the 1PDCCH signaling period occurs in a downlink radio frame or/and a subframe;

 The network device and the terminal agree to the configuration information of the PDCCH signaling, or the transmission control module notifies the terminal of the configuration information of the PDCCH signaling by using the broadcast signaling.

The network device ₅ according to claim 29, wherein the transmission control module is specifically configured to notify the PBCH channel in sequence according to the type of the terminal used for data transmission on the downlink data transmission frequency band. The frequency position and bandwidth information of the downlink data transmission band of each type of terminal.

The network device according to claim 32, wherein the transmission control module is specifically configured to: transmit, according to an agreed order, a frequency position and a bandwidth of a downlink data transmission frequency band of each type of terminal in a PBCH channel. Information; or, the frequency position and bandwidth of the downlink data transmission frequency band of each type of terminal are mapped into corresponding identifiers in advance, and are fascinated The network device and the terminal agree to transmit a sequence; the transmission control module transmits a frequency point position indicating a downlink data transmission frequency band in the PBCH channel according to an agreed order

The network device of claim 28, wherein the transmission control module is further configured to notify the terminal of the downlink data transmission band change information by signaling when the downlink data transmission frequency band changes.

 The network device of claim 34, wherein the transmission control module is configured to: send a paging indication that the system message is changed to the terminal, to notify the terminal to read the updated bearer for loading a channel for downlink data transmission band information;

 Or sending a PDCCH orite command to the terminal, where the PDCCH order command carries the frequency location and bandwidth information of the updated downlink data transmission frequency band, or the PDCCH order command carries the indication information to indicate the terminal Reading the updated channel for carrying downlink data transmission frequency band information;

 Or, by adding a bit indication in the PDCCH signaling that is scheduled to the terminal, to indicate downlink data transmission band change information;

 Alternatively, the signaling carrying the downlink data transmission band change information is transmitted in the PDSCH channel, and the change information includes: a target frequency, and an effective time information.

 The network device according to claim 35, wherein the transmission control module is configured to: carry a bit sequence in the PDCCH signaling that is scheduled by the terminal, where one bit of the bit sequence corresponds to one The working frequency, when the bit value is the set value, indicates that the downlink data transmission is performed on the downlink data transmission frequency band corresponding to the read bit; or the PDCCH signaling that is scheduled by the terminal carries the count value; When the network device adjusts the downlink data transmission frequency band for the terminal, the count value is incremented by one, so that the terminal reads the downlink data for carrying the downlink data transmission band according to the count value of the two previous scheduling. a channel for transmitting band information, which carries frequency and bandwidth information of the updated downlink data transmission band

The network device as claimed in claim 35 or 36, wherein the channel for carrying downlink data transmission frequency band information comprises: a PBCH channel or a PDCCH channel of a common search space. The network device according to claim 27, wherein, when the network device schedules the terminal, the frequency resource range indicated by the resource indication bit in the downlink control channel is within the working bandwidth of the entire UTE system. Or limited to the downlink data transmission frequency band.

 39. The method according to any one of claims 27-36, 38, wherein the system control area occupies a bandwidth of Ι; ΓΕ system operating bandwidth „

 40. A terminal device, applied to a system, wherein: a data field in a downlink system operating frequency band of the LIE system is configured with at least one downlink data transmission band, and a bandwidth of each downlink data transmission frequency band is smaller than a LIE system. The bandwidth occupied by the control channel area, the terminal device includes:

 a control information acquiring module, configured to receive control signaling sent by the network device by using a downlink control channel in a system control area;

 a data transmission module, configured to receive downlink data sent by the network device on a downlink data transmission frequency band of the terminal according to the control signaling

 The terminal device according to claim 40, wherein the frequency location and bandwidth information of the downlink data transmission band are agreed between the terminal and the network device;

 Or the control information acquiring module is further configured to: acquire, according to the signaling sent by the network device, frequency point location and bandwidth information of the downlink data transmission frequency band, where each downlink data transmission frequency band has the same bandwidth and is partially the same Or different

 The terminal device according to the above, wherein the control information acquiring module is specifically configured to: according to the PBCH: signaling sent by the network device or the PDCCH of a common search space of a downlink control channel. Signaling, obtaining frequency location and bandwidth information of a downlink data transmission frequency band; wherein the network equipment carries the frequency location of the downlink data transmission frequency band by extending existing PBCH: signaling or adding PBCH signaling Bandwidth letter,

The terminal device according to claim 42, wherein the RN'n is configured for different types of terminals according to the type of the terminal for performing the number 4 transmission in the downlink data transmission frequency band; The t-type information acquiring module is specifically configured to receive the PDCCH signaling _β by using a corresponding RNTi according to the type of the terminal.

 The terminal device according to claim 42, wherein the PDCCH signaling adopts a periodic configuration, and the PDCCH signaling period occurs in a downlink radio frame or/and a subframe;

 And the configuration information of the PDCCH signaling is obtained by the terminal device and the network device, or the control information acquiring module extracts the configuration information of the PDCCH signaling by using the broadcast signaling sent by the network device.

 The terminal device according to claim 42, wherein the control information acquiring module is configured to receive, according to a predetermined sequence, a downlink corresponding to the type of the terminal that is sent by the network device in the PBCH channel. Frequency location and bandwidth information of the data transmission band;

 Or, the frequency location and the bandwidth of the downlink data transmission frequency band of each type of terminal are mapped into corresponding identifiers, and a transmission sequence is agreed between the network device and the terminal; And receiving, by the network device, an identifier for indicating a frequency point location and a bandwidth of a downlink data transmission frequency band, and determining, according to the identifier, a frequency point location and bandwidth information of the corresponding downlink data transmission frequency band.

 The terminal device according to claim 4, wherein the control information acquiring module is further configured to: at a frequency point location and bandwidth information of the downlink data transmission frequency band, by the network device by signaling When the terminal is instructed to obtain the frequency location and bandwidth information of the updated downlink data transmission frequency band according to the signaling sent by the network device, or obtain the updated information after the downlink data transmission frequency band information is changed by itself. Downlink data transmission band information

 The terminal device according to claim 46, wherein the control information acquiring module is specifically configured to:

 And reading, according to the paging indication changed by the network device, the system message sent by the terminal, reading the updated channel for carrying the downlink data transmission frequency band information, and acquiring the frequency of the updated downlink data transmission frequency band carried therein Location and bandwidth information;

Or receiving a PDCCH order command sent by the network device, acquiring Carrying the frequency location and bandwidth information of the updated downlink data transmission frequency band; or acquiring the indication information carried therein, and reading the updated channel for carrying the downlink data transmission frequency band information according to the indication information, and acquiring the carried therein Frequency location and bandwidth information of the downlink data transmission band;

 Or obtaining, according to the bit indication added by the network device in the PDCCH signaling scheduled by the terminal, the updated downlink: frequency location and bandwidth information of the data transmission frequency band;

 Or, according to the signaling of the downlink data transmission band change information transmitted by the network device in the PDSCH channel, acquiring the frequency location and bandwidth information of the updated downlink data transmission frequency band, where the change information includes: a target frequency point , effective time information.

 The terminal device as claimed in claim 47, wherein the control information acquiring module is configured to: receive PDCCH signaling sent by the network device when scheduling the terminal, where the signaling is Carrying a bit sequence, where one bit of the bit sequence corresponds to one working frequency point, and the terminal uses the frequency position and bandwidth of the downlink data transmission frequency band corresponding to the bit of the set value in the bit sequence as the updated downlink Frequency location and bandwidth information of the data transmission band;

 Or, receiving the PDCCH signaling that is sent by the network device when scheduling the terminal, where the signaling carries a count value, where the network device performs a downlink data transmission frequency band for the scheduling of the terminal, The count value is incremented by one; the control information acquisition module determines whether the downlink data transmission frequency has changed according to whether the count value of the two previous schedules changes, and if it is determined that the downlink data transmission frequency band changes, the read is used to carry the downlink teaching. According to the channel for transmitting the frequency band information, to obtain the frequency position and bandwidth information of the updated downlink data transmission frequency band carried therein

 The terminal device according to claim 46, wherein the control information acquiring module is configured to: after detecting a channel for carrying downlink data transmission frequency band information, obtain an updated downlink number carried therein频 Frequency point location and bandwidth information of the transmission band;

Alternatively, after the frequency location and bandwidth information of the downlink data transmission frequency band are first acquired from the channel for carrying the downlink data transmission frequency band information, the channel is no longer detected; The network device reads the channel for carrying the downlink data transmission frequency band information to obtain the frequency location and bandwidth information of the updated downlink data transmission frequency band carried therein when the network device fails to detect the PDCCH indication in the scheduling process;

Or, according to the PDCCH signaling sent by the network device, when the PRB resource range indicated by the signaling is not in the current downlink data transmission frequency band of the terminal, the channel for carrying the downlink data transmission frequency band information is read, And obtaining the frequency location and bandwidth information of the updated downlink data transmission frequency band carried therein _;

 The terminal device according to any one of claims 47 to 49, wherein the frequency band information channel used for carrying downlink data transmission comprises: a PBCH channel or a PDCCH channel of a common search space.

 The terminal device according to claim 40, wherein when the network device schedules the terminal, the frequency resource range indicated by the resource indication bit in the downlink control channel is within the working bandwidth of the entire IXE system or Limited to the downlink data transmission frequency band.

 The terminal device according to any one of claims 40-49, 51, wherein the system channel area occupies a bandwidth of the LIE system.