CN1960352A - Wireless transfer communication system and method based on OFDMA FDD - Google Patents

Abstract

The invention relates to a wireless relay communication system and method based on OFDMA-FDD. The system of the present invention includes a BS (base station), an RS (relay station) and a user terminal, and the method mainly includes: respectively adopting time division multiplexing in the downlink subframe and the uplink subframe of the base station BS physical layer frame structure of the OFDMA system The downlink transit area and the uplink transit area are set in the TDM mode, and the downlink transit area and the uplink transit area are respectively set in the uplink subframe and downlink subframe of the OFDMA-FDD wireless transceiver physical layer frame structure of the relay station RS, which are used to define the BS and uplink transit area. Combining sub-channels and OFDMA symbols between RSs; after that, wireless relay communication is performed between BS, RS and user terminals based on the uplink and downlink physical layer frames of BS and RS set as described above. The implementation of the present invention can effectively guarantee the transfer communication between RS, BS and user terminal, and can avoid various interferences that may occur during the transfer communication process.

Description

Wireless relay communication system and method based on OFDMA-FDD

technical field

The present invention relates to the technical field of wireless communication, in particular to an OFDMA-FDD-based wireless relay communication system and method.

Background technique

IEEE 802.16 is the first broadband wireless access standard, which mainly includes two versions: one is the broadband fixed wireless access version 802.16-2004 of the 802.16 standard, and the other is the broadband mobile wireless access version 802.16e of the 802.16 standard. Only two network elements are defined in the 802.16-2004 standard, specifically BS (base station) and SS (subscriber station); in the 802.16e standard, only two network elements are also defined, specifically BS and MSS (mobile subscriber station). stand).

At present, the 802.16 Multihop Relay SG (802.16 Multihop Relay Research Group) only proposed the concept of RS (Relay Station) for WiMAX (Global Interoperability of Microwave Access). The relay communication entity of the BS, thereby expanding the coverage of the BS or increasing the throughput of the user station.

In addition, at present, in communication systems, such as 802.16 systems, OFDM (Orthogonal Frequency Division Multiplexing) or OFDMA (Orthogonal Frequency Division Multiplexing Access) technology is usually used for communication. In a channel (Channel) of an OFDM or OFDMA system, its OFDM or OFDMA symbol is composed of subcarriers (Subcarrier), and the number of subcarriers determines the number of FFT transformation points. Subcarriers constituting a subchannel (Subchannel) may or may not be adjacent, and FIG. 1 shows an example of adjacent subcarriers.

In a communication system, subcarriers can be divided into the following types according to the type of data transmitted:

1. Data subcarriers: subcarriers used to transmit data;

2. Pilot subcarrier: subcarrier used for pilot frequency;

3. Empty subcarriers: subcarriers that are not used to transmit any number, including guard bands (Guard Band) and DC subcarriers (DC Subcarrier).

In an OFDM or OFDMA system, different users divide the uplink FFT (Fast Fourier Transform) space, and each user transmits on one or more sub-channels. The division of sub-channels is an FDMA method. All effective sub-carriers are divided into several sub-carrier sets, and each sub-carrier set is called a sub-channel (subchannel).

In the process of dividing sub-channels, the following three methods are mainly used:

The first is to divide the carrier into continuous groups, which is the simplest to implement, and the interference of adjacent sub-channels is small, but the obtained frequency diversity effect is poor.

The second is that carriers of different sub-channels are interleaved in a regular manner. This frequency diversity effect is better, but the system is more sensitive to inter-sub-channel interference.

The third is an improvement on the second, that is, carriers of different sub-channels are interleaved in a pseudo-random manner, and different base stations use different sequence change codes to reduce interference between base stations.

In the 802.16 standard, for the licensed frequency band, the duplex mode can be FDD (frequency division duplex) and TDD (time division duplex), the SS of the FDD mode can be half-duplex FDD, and for the license-free frequency band, the duplex mode It can only be TDD. The frame structure of 802.16OFDMA (or SOFDMA) under FDD is shown in Figure 2. In 802.16 OFDMA (or SOFDMA) mode, a PHY burst (burst) in OFDMA (or SOFDMA) is assigned a group of adjacent sub-channels and a group of OFDMA symbols (symbol).

The data transmitted on the physical channel is transmitted in the format of frame (Frame). Each frame includes a downlink subframe (DL subframe, abbreviated as DL in FIG. 2 ) and an uplink subframe (UL subframe, abbreviated as DL in FIG. 2 ). In the FDD mode, the downlink subframe and the uplink subframe use different frequencies for transmission. As shown in Figure 2, the DL uses frequency f1, and the UL uses frequency f2.

A burst can be assigned to an SS/MSS (or a group of users) in the uplink, and can be sent to the SS/MSS by the BS as a sending unit in the downlink. The initial access ranging Ranging, periodic ranging Ranging, and bandwidth request of the uplink SS are all performed through the Ranging subchannel. The downlink subframe starts with a preamble for physical synchronization; followed by FCH, which is used to specify the profile and length of one or more downlink Bursts following the FCH. Then there are DL-MAP (downlink mapping table) and UL-MAP (uplink mapping table) messages. DL-MAP is used to indicate the subchannel and OFDMA symbol position and usage method (profile) of each downlink burst, and UL-MAP is used to indicate The subchannel and OFDMA symbol position and usage method (profile) of each uplink burst.

Although the above-mentioned OFDM or OFDMA technical structure can meet the communication requirements in the communication system, for the relay communication system including the RS, there is no corresponding technology that can meet the corresponding relay communication requirements.

Contents of the invention

The purpose of the present invention is to provide a wireless relay communication system and method based on dual OFDMA-FDD, so as to realize relay communication based on RS in the communication system, and can effectively avoid various possible interferences.

The purpose of the present invention is achieved through the following technical solutions:

The present invention provides a wireless transfer communication system based on OFDMA-FDD, which includes a base station BS, a transfer station RS and a user terminal. The RS is respectively provided with an interface for communicating with the BS and the user terminal, and the RS includes The first OFDMA-FDD wireless transceiver and the second OFDMA-FDD wireless transceiver, wherein the first OFDMA-FDD wireless transceiver in the RS includes the first OFDMA-FDD wireless transmitter physical layer unit and the first OFDMA-FDD The physical unit of the wireless receiver corresponds to the physical layer unit of the OFDMA-FDD wireless receiver and the physical layer unit of the OFDMA-FDD wireless transmitter in the user terminal and maintains the synchronization of sending and receiving frames; the second OFDMA-FDD wireless transceiver in the RS contains the first The two OFDMA-FDD wireless transmitter physical layer units and the second OFDMA-FDD wireless receiver physical layer unit correspond to the OFDMA-FDD wireless receiver physical layer unit and the OFDMA-FDD wireless transmitter physical layer unit in the BS and maintain frame synchronization for sending and receiving .

The BS is also provided with a wired transmission processing unit connected to the upper-level equipment.

The BS, RS and user terminal are also provided with corresponding OFDMA-FDD wireless transceiver data link layer units respectively.

The BS also provides an interface for communicating with the user terminal. The BS converts the preamble Preamble, the frame control header FCH, and the downlink mapping table DL-MAP by using a predetermined channel coding and modulation method, or using a predetermined transmission power value. and the uplink mapping table UL-MAP information are directly sent to the user terminal through this interface.

The present invention also provides a method for realizing wireless relay communication, including:

A. In the downlink subframe and uplink subframe of the base station BS physical layer frame structure of the OFDMA system, the downlink transfer area and the uplink transfer area are respectively set in the time division multiplexing TDM mode, and the second OFDMA-FDD wireless transceiver in the transfer station RS is physically In the uplink subframe and downlink subframe of the layer frame structure, a downlink transfer area and an uplink transfer area are respectively set, which are used to define the intermediate channel and OFDMA symbol combination between the BS and the RS;

B. The uplink and downlink physical layer frames of the BS and RS are set based on the above settings between the BS, the RS and the user terminal, using FDD to perform wireless relay communication.

Described step A also includes:

During the period corresponding to the uplink transit area of the BS, the user terminal does not set any combination of sending subchannels and OFDMA symbols, and the RS does not set any combination of receiving subchannels and OFDMA symbols; during the period corresponding to the downlink transit area of the BS, the RS does not set any combination of sending subchannels and OFDMA symbols. Channel and OFDMA symbol combination.

In the present invention, when there are multiple RSs, the second OFDMA-FDD wireless transceivers of multiple RSs share the downlink or uplink transit area through different combinations of subchannels and OFDMA symbols, and the second OFDMA-FDD wireless transceivers of different RSs The transceiver only receives or transmits data in the corresponding combination of subchannels and OFDMA symbols in the downlink or uplink transit area.

Described step A comprises:

Set the downlink transit broadcast subchannel in the downlink transit area of the downlink subframe of the physical frame structure of the BS, which is used to define the downlink channel and OFDMA symbol combination broadcast by the BS to the RS, and broadcast the corresponding broadcast message;

Set the downlink relay broadcast subchannel in the downlink transfer area of the uplink subframe of the physical frame structure of the second OFDMA-FDD wireless transceiver of the RS, which is used to define the RS uplink subchannel and OFDMA symbol combination for receiving the BS downlink relay broadcast channel, Receive the corresponding broadcast message.

Described step A also includes:

The relay ranging subchannel is set in the downlink subframe of the physical layer frame structure of the BS, which is used to define the BS relay ranging receiving subchannel and OFDMA symbol combination for initial access ranging, periodic ranging, and bandwidth request of the RS;

In the downlink subframe of the physical layer frame structure of the second OFDMA-FDD wireless transceiver of the RS, the relay ranging transmission subchannel is set, which is used to define the initial access ranging, periodic ranging, and RS relay measurement of the bandwidth request of the RS. The distance between the transmit subchannel and the OFDMA symbol combination.

The relay ranging sub-channel of the BS and the relay ranging sending sub-channel of the RS are correspondingly set and kept in strict synchronization.

Described step A also includes:

Set the downlink frame header in the downlink frame of the physical layer frame structure of the BS, or BS and RS first OFDMA-FDD wireless transceiver, specifically set at the beginning of the downlink subframe, used to define the subchannel and send the user synchronization information Combination of subchannels and OFDMA symbols indicating information, used to indicate the position and use method profile of each subchannel of the BS, or BS and RS physical layer frame structure downlink frame and uplink frame, wherein the first OFDMA-FDD wireless transceiver of RS The downlink frame header of the receiver lags behind the downlink frame header of the BS in time, and during the downlink frame header of the first OFDMA-FDD wireless transceiver of the RS, the BS cannot set the downlink subframe transmission subchannel and OFDMA symbol combination.

The said downlink subframe includes:

Preamble preamble, frame control header FCH burst, downlink mapping table DL-MAP and/or uplink mapping table UL-MAP in orthogonal frequency division multiplexing or single carrier frame.

Described step A also includes:

The head of the downlink subframe of the first OFDMA-FDD wireless transmitter of the RS lags behind the head of the downlink frame of the BS in time, and during the head of the downlink frame of the RS, the downlink subframe of the BS cannot arrange any combination of transmission subchannels and OFDMA symbols ;

And/or, when there are multiple RSs, during the downlink frame header of the first OFDMA-FDD wireless transceiver of the RS, other RS first FDD wireless transceivers cannot set the downlink subframe transmission subchannel and OFDMA symbol combination;

or,

When there are multiple RSs, the downlink subframe headers of the first OFDMA-FDD wireless transceivers of different RSs completely overlap in time and are strictly synchronized, and the content of the downlink subframe headers must be the same.

Described step A also includes:

Set the downlink subframe header reception in the downlink frame of the physical layer frame structure of the second OFDMA-FDD wireless transceiver of the RS, which is used to define the subchannel and OFDMA symbol combination of the RS receiving the BS downlink frame header, and the downlink frame header reception The downlink frame header of the BS needs to completely overlap and be strictly synchronized.

Described step A also includes:

The ranging sub-channel is set in the uplink subframe of the physical layer frame structure of the first OFDMA-FDD wireless transceiver of the BS and RS, which is used to define the received ranging, periodic ranging, and RS measuring of the bandwidth request of the user terminal The distance between receiving subchannels and OFDMA symbol combinations.

Described step A also includes:

In the downlink subframe of the physical layer frame structure of the first OFDMA-FDD wireless transceiver of the BS or RS, except the downlink subframe header, the downlink transit area of the BS, and the downlink subframe of the first OFDMA-FDD wireless transmitter of the RS in the BS Except for the corresponding period of the frame header and the downlink transit area of the BS, the BS and different RSs share the rest of the downlink subframe through different combinations of subchannels and OFDMA symbols.

Described step A comprises:

In the uplink subframe of the physical layer frame structure of the first OFDMA-FDD wireless receiver of the BS or RS, except for the period corresponding to the uplink transit zone of the BS and the first OFDMA-FDD wireless receiver of the RS in the uplink transit zone of the BS , the BS and different RSs share the rest of the uplink subframe through different subchannels and OFDMA combinations.

Described step A comprises:

Except for the downlink frame header and the ranging sub-channel, each sub-channel and OFDMA symbol combination or area is not required to be set in each frame.

Described step B comprises:

Between the BS, the RS and the user terminal, based on the uplink and downlink physical layer frames of the BS and the RS, the uplink and downlink transfer areas, uplink and downlink transfer broadcast subchannels, downlink subframe headers, downlink subframe header reception and/or The ranging sub-channel performs message interaction to realize wireless relay communication.

The present invention also provides a method for implementing wireless relay communication, including:

Downlink communication process from BS to user terminal:

C. The BS sends data to the RS in the downlink transit area of the downlink subframe of the BS, and the RS receives the data through the downlink transit area in the uplink subframe of the second OFDMA-FDD wireless transceiver of the RS;

D. The RS sends the data group user terminal in the downlink subframe of the first OFDMA-FDD wireless transceiver of the RS;

Uplink communication process from user terminal to BS:

E. By sending uplink data in the uplink subframe of the first OFDMA-FDD wireless transceiver of the RS by the user terminal, and the RS receives the data;

F. The RS sends the uplink transfer data in the uplink transfer area of the second OFDMA-FDD wireless transceiver downlink subframe of the RS, and the BS receives the transfer data in the uplink transfer area of the BS's uplink subframe.

The downlink communication process from the BS to the user terminal also includes:

The first OFDMA-FDD wireless transceivers of the BS and the RS respectively transmit the preamble at the first symbol of the downlink subframe head of the respective downlink subframe, and the RS or the user terminal receiving the preamble is synchronized with the BS or the RS.

In the present invention, after sending the preamble, it also includes:

The first OFDMA-FDD wireless transceiver of the BS or RS will also send frame control header FCH, downlink mapping table DL-MAP and uplink mapping table UL-MAP information, and the RS or user terminal receiving each information determines Subchannel and/or symbol location and usage information for each burst.

Described step C also includes:

The BS sends a broadcast message to the RS on the downlink transit broadcast subchannel in the downlink transit area of the BS downlink subframe, and the RS receives the message through the downlink transit broadcast subchannel in the uplink subframe of the second OFDMA-FDD wireless transceiver of the RS.

Described step C also includes:

When direct communication between the BS and the user terminal is possible, the BS broadcasts the downlink subframe header using a predetermined channel coding and modulation method, or using a predetermined transmission power for sending data, and the BS directly sends it to the user terminal.

In the present invention, the downlink communication process from the BS to the user terminal also includes:

The user terminal receives the preamble in the downlink subframe header of the BS downlink subframe, and synchronizes with the BS;

The user terminal receives the FCH, DL-MAP and UL-MAP information sent by the BS, and obtains subchannel and/or symbol positions and usage information of each burst of the BS and RS.

The described uplink communication process from the user terminal to the BS also includes:

The user terminal receives the FCH, DL-MAP and UL-MAP information of the downlink subframe header of the downlink subframe of the first OFDMA-FDD wireless transceiver of the RS, and determines each burst subchannel and symbol position and usage method information of the RS; Or, the user terminal receives the FCH, DL-MAP and UL-MAP information of the downlink subframe header of the downlink subframe of the BS, and determines each burst subchannel and symbol position and usage method information of the BS and the RS;

The second OFDMA-FDD wireless transceiver of the RS receives the FCH, DL-MAP and UL-MAP information of the downlink subframe header in the downlink subframe of the BS, and obtains the burst subchannels of the BS, symbol positions and usage information.

As can be seen from the technical solution provided by the present invention above, the present invention defines the physical layer frame structure of BS and RS by introducing the mechanism combining TDM and OFDMA, thereby can support OFDMA (or SOFDMA) wireless advanced relay mode, i.e. MS/ SS can perform wireless relay access to BS through RS; at the same time, it can also support OFDMA (or SOFDMA) wireless simplified transfer mode, that is, the downlink data message of BS or the message message except DL-MAP and UL-MAP can be transmitted through RS Relay: Other uplink bursts of BS, except initial access Ranging, periodic ranging, and bandwidth request messages of MS/SS, can be relayed through RS.

The implementation of the present invention can also effectively guarantee the communication between RS, BS and MS/SS in TDM-OFDMA-FDD mode, and avoid various interferences that may occur during the transfer communication process.

Description of drawings

Fig. 1 is a schematic diagram of OFDMA symbol subcarrier adjacent situation;

Fig. 2 is a schematic diagram of OFDMA frame structure in the communication system based on FDD;

FIG. 3 is a schematic diagram of a transfer communication mode between BS and RS;

FIG. 4 is a second schematic diagram of the relay communication mode between the BS and the RS;

Fig. 5 is a schematic structural diagram of the system of the present invention;

FIG. 6 is a schematic diagram of co-channel interference modes that may exist in a communication system;

FIG. 7 is a first schematic diagram of the physical layer frame structure of the BS and the RS provided by the present invention;

FIG. 8 is a second schematic diagram of the physical layer frame structure of the BS and the RS provided by the present invention.

Detailed ways

The advanced relay communication mode of RS, BS, and MS/SS of the present invention, as shown in Figure 3, uses TDM-OFDMA-FDD communication between RS, BS, and MS/SS, BS and RS use frequency f2 for downlink, BS and RS Uplink uses frequency f1; MS/SS accesses BS through wireless relay through RS, and RS accesses BS as an MS/SS.

In Figure 3, the RS needs to have two sets of FDD wireless transceivers, that is, FDD transceiver 1 and FDD transceiver 2 in Figure 3, specifically: the first set of transmitter TX1 works at frequency f1, and the receiver RX1 works at frequency f2; the second transmitter TX2 works at frequency f2, and the receiver RX2 works at frequency f1.

In addition, in Figure 3, the DL _BS is the downlink subframe of the BS physical layer frame, from the BS to the SS/MS _BS or RS, and the UL _BS is the uplink subframe of the BS physical layer frame, from the SS/MS _BS or RS To BS, SS/MS _BS , the second set of wireless transceivers of RS and BS keep sending and receiving frame synchronization; DL _RS is the downlink subframe of the physical layer frame of RS, from BS to SS/MS _RS or RS, UL _RS is RS The uplink subframe of the physical layer frame is from SS/MS _RS or RS to BS, and the first set of wireless transceivers of SS/MS _RS and RS maintains the synchronization of sending and receiving frames.

The simplified transit communication mode of RS, BS, and MS/SS of the present invention is shown in FIG. 4 . The corresponding RS also needs two sets of FDD wireless transceivers: the first set of transmitter TX1 works at frequency f1, the receiver RX1 works at frequency f2; the second set of transmitter TX2 works at frequency f2, and the receiver RX2 works at frequency f1 . Moreover, in Figure 4, the DL _BS is the downlink frame of the physical layer frame of the BS, from the BS to the SS/MS _BS or RS, and the UL _BS is the uplink frame of the physical layer frame of the BS, from the SS/MS _BS or RS to the BS ; SS/MS _BS or SS/MS _RS , the second wireless transceiver of RS and BS keep sending and receiving frames synchronously. The DL _RS is the downlink frame of the physical layer frame of the RS, from the BS to the SS/MS _RS or RS, and the UL _RS is the uplink frame of the physical layer frame of the RS, from the SS/MS _RS or the RS to the BS. Among them, the downlink broadcast burst (Broadcast Burst) of the DL _BS , such as Preamble, FCH, DL-MAP, UL-MAP, is directly sent by the BS to the MS/SS without relaying through the RS; the initial access ranging of the MS/SS Ranging, periodic ranging Ranging, and bandwidth requests are sent directly from the MS/SS to the BS through the Ranging Subchannel of the UL _BS without relaying through the RS; for other downlink bursts of the DL _BS , such as data packets or Messages other than DL-MAP and UL-MAP cannot be directly sent from BS to MS/SS, but must be relayed through RS; other uplink bursts of UL _BS , such as initial access ranging and periodicity of MS/SS Except for the Ranging and bandwidth request messages, they cannot be sent directly from the MS/SS to the BS, but must be relayed through the RS.

The present invention provides a wireless transfer communication system including BS, RS and SS/MS, respectively adopting two communication modes: advanced transfer mode and simplified transfer mode, specifically as shown in Figure 5:

Among them, BS includes:

Wired transmission processing unit: able to establish communication with upper-level equipment (such as base station controller) or with a group of base station equipment respectively, and perform information interaction with upper-level equipment or each base station equipment;

OFDMA-FDD wireless transceiver: used for wireless communication with RS or SS/MS in OFDMA-FDD mode, consisting of OFDMA-FDD wireless transmitter physical layer processing unit, OFDMA-FDD wireless receiver physical layer processing unit and OFDMA wireless transceiver It is composed of machine data link layer processing unit.

OFDMA-FDD wireless transmitter physical layer processing unit (frequency f1): respectively communicate with OFDMA wireless transceiver data link layer and OFDMA-FDD wireless receiver 2 physical layer processing unit in the RS or SS/MS The physical layer processing unit of the OFDMA-FDD wireless receiver performs wireless communication; for the simplified transfer mode, this unit broadcasts the downlink subframe head of the DL _BS (such as Preamble, FCH, DL-MAP, UL-MAP) using a higher than other transmission data More reliable channel coding and modulation methods (such as binary phase shift keying BPSK), or use higher transmission power than other transmitted data, directly sent by BS to MS/SS, without relaying through RS;

OFDMA-FDD wireless receiver physical layer processing unit (frequency f2): respectively communicate with OFDMA wireless transceiver data link layer and OFDMA-FDD wireless transmitter 2 physical layer processing unit in the RS or SS/MS OFDMA-FDD wireless transmitter physical layer processing unit for wireless communication;

OFDMA wireless transceiver data link layer processing unit: For the data from OFDMA-FDD wireless receiver physical layer processing unit or wired transmission processing unit, after data processing of OFDMA wireless transceiver data link layer, forward it to wired transmission processing unit or OFDMA-FDD wireless transmitter physical layer processing unit.

The RS in the figure includes:

OFDMA-FDD wireless transceivers 1 and 2: used for wireless communication with BS or SS/MS in OFDMA-FDD mode, consisting of physical layer processing units of OFDMA-FDD wireless transmitters 1 and 2, OFDMA-FDD wireless receiver 1 And 2 physical layer processing unit and OFDMA wireless transceiver data link layer processing unit.

OFDMA-FDD wireless transmitter 2 physical layer processing unit (frequency is f2), that is, the second OFDMA-FDD wireless transmitter physical layer processing unit: respectively communicate with the OFDMA wireless transceiver data link layer and the BS that can communicate with it - FDD wireless receiver physical layer processing unit for wireless communication;

OFDMA-FDD wireless transmitter 1 physical layer processing unit (frequency is f1), that is, the first OFDMA-FDD wireless transmitter physical layer processing unit: respectively communicates with the OFDMA wireless transceiver data link layer and the SS/MS that can communicate with it The OFDMA-FDD wireless receiver physical layer processing unit performs wireless communication;

OFDMA-FDD wireless receiver 2 physical layer processing unit (frequency is f1), that is, the second OFDMA-FDD wireless receiver physical layer processing unit: respectively communicate with the OFDMA wireless transceiver data link layer and the BS that can communicate with it - FDD wireless transmitter physical layer processing unit for wireless communication;

OFDMA-FDD wireless receiver 1 physical layer processing unit (frequency is f2), i.e. the first OFDMA-FDD wireless receiver physical layer processing unit: respectively communicate with the OFDMA wireless transceiver data link layer and the SS/MS that can communicate with it OFDMA-FDD wireless transmitter physical layer processing unit for wireless communication;

OFDMA wireless transceiver data link layer processing unit: For the data from OFDMA-FDD wireless receiver 1 and/or 2 physical layer processing unit, after data processing of OFDMA wireless transceiver data link layer, forward it to OFDMA-FDD Wireless transmitter 1 and/or 2 physical layer processing unit.

Wherein, the OFDMA-FDD wireless transmitter 1 and the OFDMA-FDD wireless receiver 1 are the first OFDMA-FDD wireless transceiver, and the OFDMA-FDD wireless transmitter 2 and the OFDMA-FDD wireless receiver 2 are the first OFDMA-FDD wireless transceiver Two OFDMA-FDD wireless transceivers.

The SS/MS in the figure includes:

OFDMA-FDD wireless transceiver: used for wireless communication with RS or BS in OFDMA-FDD mode, consisting of OFDMA-FDD wireless transmitter physical layer processing unit, OFDMA-FDD wireless receiver physical layer processing unit and OFDMA wireless transceiver data The link layer processing unit is composed.

OFDMA-FDD wireless transmitter physical layer processing unit: respectively communicate with OFDMA wireless transceiver data link layer and OFDMA-FDD wireless receiver 1 physical layer processing unit in RS or BS OFDMA-FDD wireless receiver physical layer processing The unit performs wireless communication; for the simplified transfer mode, the unit performs uplink random access (Random Access) slots (or contention slots) of the UL _BS , such as initial Ranging contention slots and bandwidth request contention slots, Or MS/SS's initial access ranging Ranging, periodic ranging Ranging, and bandwidth request through the ranging subchannel Ranging Subchannel of the UL _BS , using channel coding and modulation methods with higher reliability than other transmitted data (such as binary phase Shift keying BPSK), or use a higher transmission power than other transmitted data, and send it directly from the MS/SS to the BS without relaying through the RS;

OFDMA-FDD wireless receiver physical layer processing unit: separately communicate with OFDMA wireless transceiver data link layer and OFDMA-FDD wireless transmitter 1 physical layer processing unit in RS or OFDMA-FDD wireless transmitter physical layer in BS that can communicate with it layer processing unit for wireless communication;

OFDMA wireless transceiver data link layer processing unit: For the data from the OFDMA-FDD wireless receiver physical layer processing unit or user, after data processing of the OFDMA wireless transceiver data link layer, forward it to the user or OFDMA-FDD wireless Transmitter physical layer processing unit.

In the FDD communication mode, network system communication may have mutual interference in the four situations shown in Figure 6(a)-(d). Wherein, TX represents a transmitting module, and RX represents a receiving module.

In order to realize relay communication based on RS in the present invention, it is necessary to set reasonable physical layer frame structures of BS and RS, so as to ensure that the transfer communication process can be reliably realized, and at the same time, it can also effectively avoid various interferences that may exist in FIG. 4 .

The specific implementation of the physical layer frame structure of the BS and RS provided by the present invention will be described in detail below.

In order to realize the relay communication function based on RS, the following settings need to be made in the physical layer frame structure of BS and RS:

1. TDM (time division multiplexing) technology is used in the downlink subframe DL _BS with the frequency of f1 in the physical layer frame structure of the BS, and the DL Relay Zone (downlink transfer zone) is added to define the BS downlink transmitted from the BS to the RS Combination of sub-channels and OFDMA symbols;

In the present invention, for the case of multiple RSs, the multiple RSs share the DL Relay Zone through different sub-channels and OFDMA symbol combinations;

2. Adopt TDM technology in the physical layer frame structure of the second set of wireless receiver RX2 whose frequency of RS is f1, and open up a DL Relay Zone (downlink transit area), which is used to define the intermediate rotor channel of the DL Relay Zone where the RS receives the BS combined with OFDMA symbols;

For the case of multiple RSs, multiple RSs share the DL Relay Zone through different combinations of subchannels and OFDMA symbols. Different RSs RX2 only receive the relay data of the BS in the corresponding combinations of subchannels and OFDMA symbols in the DL Relay Zone. The combination of sub-channel and OFDMA symbol is not arranged to receive;

3. TDM technology is adopted in the uplink subframe UL _BS with the frequency of f2 in the physical layer frame structure of the BS, and the UL Relay Zone (uplink transfer zone) is added to define the BS uplink intermediate rotor channel and OFDMA transmitted from the RS to the BS combination of symbols;

For the case of multiple RSs, multiple RSs share the ULRelay Zone through different combinations of subchannels and OFDMA symbols;

4. Adopt TDM technology in the physical layer frame structure of the second set of wireless transmitter TX2 whose frequency of RS is f2, and open up the UL Relay Zone (uplink transit area), which is used to define the intermediate rotor channel of the UL Relay Zone of the RS receiving BS combined with OFDMA symbols;

For the case of multiple RSs, multiple RSs share the UL Relay Zone through different combinations of sub-channels and OFDMA symbols, and different RS TX2s only transmit the relay data of the BS in the corresponding combinations of sub-channels and OFDMA symbols in the UL Relay Zone, and other sub-channels and OFDMA symbol combinations cannot be scheduled for transmission.

During the period corresponding to the BS UL Relay Zone, SS/MS _BS and SS/MS _RS do not arrange any combination of sending subchannels and OFDMA symbols, and RS does not arrange any combination of receiving subchannels and OFDMA symbols to avoid "SS/MS _BS to BS ", "SS/MS _RS to BS"interference; during the period corresponding to the BS DL Relay Zone, RS does not arrange any combination of sending subchannels and OFDMA symbols to avoid "RS to RS" self-interference.

In order to ensure the transmission of broadcast information between BS and RS during transit communication, the following settings need to be made in the physical layer frame structure of BS and RS:

1. Create a DL Relay Broadcast Subchannel (downlink relay broadcast subchannel) in the DL Relay Zone of the downlink subframe DL _BS with the frequency f1 of the physical layer frame structure of the BS, which is used to define the downlink subchannel broadcast by the BS to the RS and OFDMA symbol combination, broadcast information includes DCD (downlink channel descriptor), UCD (uplink channel descriptor), FPC (fast power control), CLK_CMP (clock comparison) broadcast messages defined by the 802.16 standard;

2. Create a DL Relay Broadcast Subchannel (downlink relay broadcast subchannel) in the DL Relay Zone of the physical layer frame structure of the second set of wireless receiver RX2 whose frequency is f1 of the RS, to define the time slot for receiving the BS downlink relay broadcast Combination of RS uplink sub-channels and OFDMA symbols, receiving and broadcasting DCD, UCD, FPC, and CLK_CMP broadcast messages defined by the 802.16 standard.

In the present invention, also carry out following setting in the physical layer frame structure of BS and RS:

1. Define the Relay Ranging Subchannel (relay ranging subchannel, abbreviated as RRS) in the UL Relay Zone of the uplink subframe UL _BS with the frequency f2 of the physical layer frame structure of the BS, and define the initial access ranging for the RS Ranging, periodic ranging Ranging, BS relay ranging receiving subchannel and OFDMA symbol combination for bandwidth request; the relay ranging subchannel RRS can also be used as initial access ranging Ranging, periodic ranging Ranging, Bandwidth request ranging sub-channel;

2. Create a Relay Ranging TX Subchannel (relay ranging subchannel, abbreviated as RRS TX) in the DL Relay Zone of the physical layer frame structure of the second set of wireless transmitter TX2 whose frequency is f2, used to define the initial RS Combination of access ranging Ranging, periodic ranging Ranging, RS relay ranging transmission subchannel and OFDMA symbol for bandwidth request.

The time-frequency relationship between the Relay Ranging Subchannel of the BS and the Relay Ranging TX Subchannel of the RS TX2 must correspond one-to-one and be strictly synchronized.

Moreover, in the downlink subframe of the physical layer frame structure of BS or RS TX1, except for the DL Header, the DL Relay Zone of the BS and the corresponding period of RX TX1 in the DL Header of the BS and the DL Relay Zone of the BS, the BS and different The RS shares the rest of the downlink subframe through different combinations of subchannels and OFDMA symbols to avoid interference from “RS to SS/MS _BS ” and “BS to SS/MS _RS ”.

In the uplink subframe of the physical layer frame structure of the BS or RS RX1, except for the UL Relay Zone of the BS and the corresponding period when the RS RX1 is in the UL Relay Zone of the BS, the BS and different RSs use different combinations of subchannels and OFDMA symbols Share the rest of the uplink subframe to avoid interference from "SS/MS _BS to RS" and "SS/MS _RS to BS".

In the present invention, also carry out following setting in the physical layer frame structure of BS and RS:

1. Define the DL Header (downlink subframe header) in the downlink subframe DL _BS with the frequency of f1 in the physical layer frame structure of the BS, which is the beginning of the downlink subframe and is used to define the subchannel and OFDMA symbol for sending user synchronization information Combining and sending subchannels and OFDMA symbol combinations indicating information to indicate the location and usage method profile of each subchannel and OFDMA symbol combination in the downlink subframe and uplink subframe of the BS physical layer frame structure;

Described synchronization information and indication information specifically include: preamble, FCH, DL-MAP and UL-MAP information in the former 802.16OFDMA (or SOFDMA) frame, make SS/MS _BS , RS and BS keep sending and receiving frame synchronization;

2. In the advanced transfer mode, define the DL Header (downlink subframe header) in the downlink subframe DL _RS of the physical layer frame structure of the first set of wireless transmitter TX1 whose RS frequency is f1, and set it in the downlink subframe It is used to define the combination of subchannels and OFDMA symbols for sending user synchronization information and the combination of subchannels and OFDMA symbols for sending indication information, so as to indicate the first set of wireless transmitter physical layer frame structure downlink subframe and uplink subframe of RS The position and use method profile of each subchannel and OFDMA symbol combination of the frame;

The synchronization information and indication information also include the preamble, FCH, DL-MAP and UL-MAP information in the original 802.16OFDMA (or SOFDMA) frame, so that the SS/MS _RS and the RS maintain frame synchronization for sending and receiving.

In the present invention, in the advanced transfer mode, the DL Header of RS TX1 lags behind the DL Header of BS in time; during the DL Header of RS TX1, the BS’s downlink subframe DL _BS cannot arrange any combination of transmission subchannels and OFDMA symbols , to avoid interference from "BS to SS/MS _RS ";

In the advanced transfer mode, during the DL Header period of RS TX1, the downlink subframe DL _RS of the physical layer frame structure of other RS TX1 cannot arrange any combination of sending subchannels and OFDMA symbols to avoid "RS to SS/MS _RS " interference.

In special cases, if the DL Headers of different RS TX1s overlap in time, they must be completely overlapped, strictly synchronized, and their contents must be the same to avoid interference from "RS to SS/MS _RS ".

In the present invention, also carry out following setting in the physical layer frame structure of BS and RS:

1. Open up DLHeader RX (downlink subframe head reception) in the physical layer frame structure of the second set of wireless receiver RX2 whose frequency of RS is f1, and is used to define the subchannel and OFDMA symbol combination of the DL Header of the receiving BS; RS The two sets of FDD transceivers of the DL Header RX Slot obtain frequency and/or symbol synchronization according to the preamble and BS received by the DL Header RX Slot.

The time-frequency relationship between the DL Header of the BS and the DL Header RX of the RS RX2 must correspond to each other and be strictly synchronized.

In the present invention, also carry out following setting in the physical layer frame structure of BS and RS:

1. Define the Ranging Subchannel (ranging subchannel) in the uplink subframe UL _BS with the frequency of f2 in the physical layer frame structure of the BS, and define the initial access ranging Ranging and periodic ranging Ranging for the SS/MSS _BS , BS ranging receiving subchannel and OFDMA symbol combination of bandwidth request;

2. In the advanced transfer mode, define the Ranging Subchannel (ranging subchannel) in the uplink subframe UL _RS of the physical layer frame structure of the first set of wireless receiver RX1 whose frequency of RS is f2, and define it for SS/MSS _RS initial access ranging Ranging, periodic ranging Ranging, RS ranging receiving subchannel and OFDMA symbol combination for bandwidth request.

In the present invention, except for DL Header and Ranging Subchanhel, the subchannels and OFDMA symbol combinations or Zones defined above do not necessarily exist in every frame.

According to the physical layer frame structure provided above, the present invention also provides a specific implementation of the physical layer frame structure of BS and RS, as shown in Figure 7 and Figure 8, wherein Figure 7 shows the BS and RS in the advanced relay mode A schematic diagram of the physical layer frame structure of the RS, and FIG. 8 is a schematic diagram of the physical layer frame structures of the BS and the RS in the simplified relay mode.

In the figure, the sending and receiving frequencies of RS and BS are subject to the frequency label at the far left of the frame in the figure, and the "NULL" or blank part in the figure is a part that does not arrange any reception or transmission.

The specific frame structure in Figure 7 and Figure 8 will be described below:

In the figure, the Preamble, UL-MAP, DL-MAP and FCH areas in the BS downlink subframe DL _BS and RS TX1 downlink subframe DL _RS are DL Headers; the white vertical bar area in the RS RX2 uplink subframe UL _RS is DL Header RX.

The DL Relay Zone of the BS is arranged after the DL Header of the DL _BS in the downlink subframe of the BS. The DL Relay Zone is the DL Relay broadcast, DL Relay R#1, #2... parts in the figure; the UL Relay of the BS The Zone is arranged at the beginning of the DL _BS in the BS downlink subframe, namely ULRelay R#1, #2... and RRS TX. During the period corresponding to BS UL Relay Zone, SS/MS _BS and SS/MS _RS do not arrange any combination of sending subchannels and OFDMA symbols, and RS does not arrange any combination of receiving subchannels and OFDMA symbols; during the period corresponding to BS DL Relay Zone, The RS does not arrange any combinations of transmit subchannels and OFDMA symbols.

A PHY burst is assigned a group of adjacent subchannels and a group of OFDMA symbols, and the BS and different RSs share the rest of the downlink subframe through different combinations of subchannels and OFDMA symbols.

The present invention also provides a specific OFDMA transfer communication processing flow based on the physical layer frame structure of the RS of the BS set above. The uplink transit communication processing flow.

The following first describes the downlink relay communication processing flow. The downlink flow includes two processing stages. The first stage is the communication process from the BS to the RS, and the second stage is the processing process from the RS to the user terminal. Specifically, :

(1) The first stage (BS->RS):

In this stage, the same processing is adopted in both advanced transfer mode and simplified transfer mode;

1. The BS sends the preamble preamble in the first symbol symbol in the DL Header of the DL _BS in the downlink subframe with frequency f1;

2. RS#1 receives the preamble in the DL Header of the BS downlink subframe DL _BS through the DL Header RX of the RS RX2 frequency f1, and synchronizes with the BS;

3. The BS sends FCH, DL-MAP, and UL-MAP information after the preamble of the DL Header of the DL _BS in the downlink subframe with frequency f1;

4. RS#1 receives the FCH, DL-MAP, and UL-MAP information of the DL Haader of the DL _BS in the downlink subframe through the DL Header RX of the RS RX2 frequency f1, and obtains the subchannels and OFDMA symbol positions of the BS downlink and uplink bursts and usage (profile) information;

5. The BS uses the DL Relay broadcast of the DL Relay Zone of the downlink subframe DL _BS with frequency f1 to send a broadcast message message;

6. The BS sends the downlink relay communication data traffic data to RS#1 in the DL Relay RS#1 of the DL Relay Zone of the DL _BS in the downlink subframe with frequency f1;

7. RS#1 receives the broadcast message in the DL Relay broadcast of the DL Relay Zone of the BS downlink subframe DL _BS through the DL RB with RS RX2 frequency f1, which may contain the message that RS#1 needs to relay the broadcast;

8. The RS#1 receives the downlink transit communication data in the DL Relay RS#1 of the DL Relay Zone of the BS downlink subframe DL _BS through the DL Relay Zone of the RS RX2 frequency f1.

(2) The second stage (RS->MS/SS):

For advanced transit mode, processing at this stage includes:

1. RS#1 TX1 sends the preamble preamble in the first symbol symbol in the DL Header of the downlink subframe DL _RS frequency f1;

2. The MS/SS receives the preamble in the DL Header of the DL _RS of the downlink subframe DL RS of RS#1 TX1, and synchronizes with RS#1;

3. RS#1 TX1 sends FCH, DL-MAP, and UL-MAP after the preamble of the DL Header with the DL _RS frequency of f1 in the downlink subframe; among them, the FCH, DL-MAP, and UL-MAP of RS#1 can be in In step 6 of the first stage, the BS sends to RS#1;

4. The MS/SS receives the FCH, DL-MAP, and UL-MAP information of the DL Header of the DL _RS in the downlink subframe DL RS of RS#1 TX1, and obtains the downlink and uplink burst subchannels of the first wireless transmitter of RS#1 and OFDMA symbol location and usage (profile) information;

5. In the downlink subframe DL _RS , RS#1 TX1 sends the downlink transit communication data traffic data to MS/SS at frequency f1 in the time-frequency interval except DL Header and DL Relay Zone, and the transit communication data is in It has been sent to RS#1 by BS in step 6;

6. The MS/SS receives the downlink transit communication data in the downlink subframe DL _RS of RS#1 TX1 from the corresponding time-frequency interval.

For the simplified transit mode, the processing at this stage specifically includes:

1. The MS/SS receives the preamble in the DL Header of the BS downlink subframe DL _BS , thereby obtaining synchronization with the BS;

2. The MS/SS receives the FCH, DL-MAP, and UL-MAP information of the DL Header of the BS downlink subframe DL _BS , and obtains the subchannels and OFDMA symbol positions and usage methods of each downlink and uplink burst of the BS and RS#1 ( profile) information;

3. In the downlink subframe DL _RS , RS#1 TX1 sends the downlink transit communication data traffic data to MS/SS at frequency f1 in the time-frequency interval except DL Header and DL Relay Zone, and the transit communication data is in It has been sent to RS#1 by BS in step 6 of the first stage;

4. The MS/SS receives the downlink transit communication data in the downlink subframe DL _RS of RS#1 TX1 from the corresponding time-frequency interval.

The following describes the uplink relay communication processing flow. The uplink flow also includes two processing stages. The first stage is the communication process from the user terminal to the RS, and the second stage is the processing process from the RS to the BS. Specifically for:

(1) The first stage (MS/SS->RS):

In this stage, for the advanced transit mode, the corresponding processing process includes:

1. MS/SS MS/SS receives the FCH, DL-MAP, and UL-MAP of the DL Header with the DL _RS frequency of f1 in the downlink subframe of RS#1 TX1, and obtains the downlink and uplink bursts of the first wireless transmitter of RS#1 Subchannel and OFDMA symbol position and usage (profile) information;

2. In the uplink subframe UL _RS of RS RX1, the MS/SS sends uplink communication data traffic data to RS#1 at frequency f2 in the time-frequency interval except the period corresponding to the BS UL Relay Zone;

3. RS#1 RX1 receives the uplink communication data traffic data in the MS/SS uplink subframe (UL _RS ) from the corresponding time-frequency interval with the frequency f2.

In this stage, for the simplified transit mode, the corresponding processing process includes:

1. MS/SS MS/SS receives the FCH, DL-MAP, and UL-MAP of the DL Header of the BS downlink subframe DL _BS frequency f1, and obtains the downlink and uplink bursts of the first set of wireless transmitters of BS and RS#1 Subchannel and OFDMA symbol location and usage (profile) information;

2. In the uplink subframe UL _RS of RS RX1, the MS/SS sends uplink communication data traffic data to RS#1 at frequency f2 in the time-frequency interval except the period corresponding to the BS UL Relay Zone;

3. RS#1 RX1 receives the uplink communication data traffic data in the MS/SS uplink subframe UL _RS from the corresponding time-frequency interval with frequency f2.

(2) The second stage (RS->BS):

In this stage, the advanced transfer mode and the simplified transfer mode adopt the same processing method;

1. RS#1 RX2 receives the FCH, DL-MAP, and UL-MAP of the DL Header with frequency f1 in the BS downlink subframe DL _BS , and obtains the subchannels and OFDMA symbol positions and usage methods of the BS downlink and uplink bursts (profile )information;

2. RS#1 TX2 sends the uplink transit communication data traffic data to the BS in the UL RelayRS#1 of the UL Relay Zone of the RS downlink subframe DL _RS with frequency f2, and the transit communication data is in step 2 of the first stage has been sent by BS to RS#1;

3. The BS receives the uplink relay communication data traffic data in S5 in the UL Relay RS#1 of the UL Relay Zone of the uplink subframe UL _BS with frequency f2.

In summary, the present invention defines the physical layer frame structure of BS and RS by introducing a mechanism combining TDM and OFDMA, so as to support OFDMA (or SOFDMA) wireless advanced transfer mode, that is, MS/SS can carry out wireless transfer through RS At the same time, it can also support OFDMA (or SOFDMA) wireless simplified transfer mode, that is, the downlink data message of BS or the message message except DL-MAP and UL-MAP can be transferred through RS; In addition to the initial access ranging Ranging, periodic ranging Ranging, and bandwidth request messages of the MS/SS, they can be relayed through the RS;

The realization of the present invention can effectively guarantee the communication between RS and BS, MS/SS in FDD/TDM/OFDMA mode, meanwhile, can also avoid the following various possible interferences:

1. Avoid interference from "RS to SS/MS _RS ", "RS to SS/MS _BS " and "BS to SS/MS _RS ";

2. Avoid interference from "SS/MS _BS to BS", "SS/MS _BS to RS" and "SS/MS _RS to BS";

3. Avoid "RS to RS" self-interference.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (26)

1, a kind of wireless transfer communication system based on OFDMA-FDD, it is characterized in that, comprise base station BS, terminal RS and user terminal, described RS provides the interface with BS and user terminal communication respectively, and in described RS, comprise an OFDMA-FDD transceiver and the 2nd OFDMA-FDD transceiver, wherein, the OFDMA-FDD wireless receiver physical layer element in the OFDMA-FDD transmitting set physical layer element that comprises of the OFDMA-FDD transceiver among the RS and an OFDMA-FDD wireless receiver physical location and the user terminal and OFDMA-FDD transmitting set physical layer element is corresponding and keep receiving frame synchronous; OFDMA-FDD wireless receiver physical layer element among the 2nd OFDMA-FDD transmitting set physical layer element that the 2nd OFDMA-FDD transceiver among the RS comprises and the 2nd OFDMA-FDD wireless receiver physical location and the BS and OFDMA-FDD transmitting set physical layer element is corresponding and keep receiving frame synchronous.

2, the wireless transfer communication system based on OFDMA-FDD according to claim 1 is characterized in that, also is provided with the wire transmission processing unit that is connected with upper level equipment among the described BS.

3, the wireless transfer communication system based on OFDMA-FDD according to claim 1 is characterized in that, also is respectively arranged with corresponding OFDMA-FDD transceiver data-link layer unit in described BS, RS and the user terminal.

4, according to claim 1,2 or 3 described wireless transfer communication system based on OFDMA-FDD, it is characterized in that, described BS also provides the interface with user terminal communication, described BS is by adopting predetermined chnnel coding and modulation system, perhaps, adopt predetermined transmission power level that lead code Preamble, frame control head FCH, descending mapping table DL-MAP and up mapping table UL-MAP information are directly sent to user terminal from this interface.

5, a kind of method in the realization wireless transfer communication is characterized in that, comprising:

A, in the descending sub frame of the base station BS physical layer frame structure of OFDMA system and sub-frame of uplink, adopt the time division multiplexing tdm mode that descending transfer district and up transfer district are set respectively, in the sub-frame of uplink of terminal RS the 2nd OFDMA-FDD transceiver physical layer frame structure and descending sub frame, descending transfer district and up transfer district are set respectively, are used to define rotor channel and OFDMA symbol combination between BS and the RS;

B, the uplink and downlink physical layer frame based on the BS of described setting and RS between BS, RS and user terminal adopt FDD to carry out wireless transfer communication.

6, method according to claim 5 is characterized in that, described steps A also comprises:

During the up transfer district of BS correspondence, user terminal is not provided with and sends subchannel and OFDMA symbol combination, and RS is not provided with any reception subchannel and OFDMA symbol combination; During the descending transfer district of BS correspondence, RS is not provided with any transmission subchannel and OFDMA symbol combination.

7, method according to claim 5, it is characterized in that, when having a plurality of RS, share downlink or uplink transfer district by different subchannels and OFDMA symbol combination between the 2nd OFDMA-FDD transceiver of a plurality of RS, different RS the 2nd OFDMA-FDD transceivers only receives or sends data in corresponding subchannel and the OFDMA symbol combination in downlink or uplink transfer district.

8, method according to claim 5 is characterized in that, described steps A comprises:

In the descending transfer district of the descending sub frame of the physical frame structure of BS, descending transfer broadcast sub-channels is set, is used to define down channel and the OFDMA symbol combination that is broadcast to RS by BS, broadcast corresponding broadcasting packet;

In the descending transfer district of the sub-frame of uplink of the physical frame structure of the 2nd OFDMA-FDD transceiver of RS, descending transfer broadcast sub-channels is set, be used to define up subchannel of RS and the OFDMA symbol combination that receives the descending transfer broadcast channel of BS, receive corresponding broadcasting packet.

9, method according to claim 5 is characterized in that, described steps A also comprises:

Transfer range finding subchannel is set in the descending sub frame of the physical layer frame structure of BS, is used to define initial access range finding, the Perodic ranging of RS, the BS transfer range finding of bandwidth request receives subchannel and OFDMA symbol combination;

The transfer range finding is set in the descending sub frame of the physical layer frame structure of RS the 2nd OFDMA-FDD transceiver sends subchannel, be used to define initial access range finding, the Perodic ranging of RS, the RS transfer range finding of bandwidth request sends subchannel and OFDMA symbol combination.

10, method according to claim 9 is characterized in that, the transfer range finding subchannel of described BS and the transfer range finding of RS send the corresponding setting of subchannel, and keep strict synchronism.

11, method according to claim 5 is characterized in that, described steps A also comprises:

At BS, or in the physical layer frame structure downlink frame of BS and RS the one OFDMA-FDD transceiver descending frame head is set, specifically be arranged at the zero hour of descending sub frame, be used to define subchannel that sends user's synchronizing information and subchannel and the OFDMA symbol combination that sends indication information, be used to indicate BS, or the position of each subchannel of BS and RS physical layer frame structure downlink frame and uplink frame and using method profile, wherein, the descending frame head of the OFDMA-FDD transceiver of RS lags behind the descending frame head of BS in time, and during the descending frame head of the OFDMA-FDD transceiver of RS, BS can not be provided with descending sub frame and send subchannel and OFDMA symbol combination.

12, according to claim 11ly realize wireless method for transfer, it is characterized in that described descending sub frame comprises based on terminal:

Lead code preamble in OFDM or the single carrier frame, frame control head FCH burst, descending mapping table DL-MAP and/or up mapping table UL-MAP.

13, according to claim 11ly realize wireless method for transfer, it is characterized in that described steps A also comprises based on terminal:

The descending sub frame head of the OFDMA-FDD transmitting set of RS lags behind the descending frame head of BS in time, and during the descending frame head of RS, the descending sub frame of BS can not be arranged any transmission subchannel and OFDMA symbol combination;

And/or when having a plurality of RS, during the descending frame head of the OFDMA-FDD transceiver of RS, other RS the one FDD transceiver can not be provided with descending sub frame and send subchannel and OFDMA symbol combination;

Or,

When having a plurality of RS, the descending sub frame head of the OFDMA-FDD transceiver of different RS is overlapping fully in time, strict synchronism, and descending sub frame head content must be identical.

14, method according to claim 11 is characterized in that, described steps A also comprises:

In the downlink frame of the physical layer frame structure of the 2nd OFDMA-FDD transceiver of RS the descending sub frame head being set receives, be used to define subchannel and the OFDMA symbol combination that RS receives the BS descending frame head, and this descending frame head receives and the descending frame head of BS needs overlapping and strict synchronism fully.

15, method according to claim 5 is characterized in that, described steps A also comprises:

In the sub-frame of uplink of the physical layer frame structure of the OFDMA-FDD transceiver of BS and RS the range finding subchannel is set, the RS range finding that is received range finding, Perodic ranging, bandwidth request that is used to define user terminal receives subchannel and OFDMA symbol combination.

16, according to each described method of claim 5 to 15, it is characterized in that described steps A also comprises:

Except that the OFDMA-FDD transmitting set of the descending transfer district of descending sub frame head, BS and RS was during the correspondence in the descending transfer district of the descending sub frame head of BS, BS, BS and different RS shared the remaining part of descending sub frame by different subchannels and OFDMA symbol combination in the descending sub frame of the physical layer frame structure of the OFDMA-FDD transceiver of BS or RS.

17, according to each described method of claim 5 to 15, it is characterized in that described steps A comprises:

In the sub-frame of uplink of the physical layer frame structure of the OFDMA-FDD wireless receiver of BS or RS, except that the OFDMA-FDD wireless receiver of the up transfer district of BS and RS was during the up transfer district of BS correspondence, BS met the remainder that sub-frame of uplink is shared in combination with different RS by different subchannels and OFDMA.

18, according to each described method of claim 5 to 15, it is characterized in that described steps A comprises:

Except that descending frame head, range finding subchannel, each subchannel and OFDMA symbol combination or district do not require and must be arranged in each frame.

19, according to each described method of claim 5 to 15, it is characterized in that described step B comprises:

The up-downgoing transfer district that comprises in the uplink and downlink physical layer frame based on BS that is provided with and RS between BS, RS and user terminal, up-downgoing transfer broadcast sub-channels, descending sub frame head, descending sub frame head receive and/or the range finding subchannel carries out the mutual of message, realize wireless transfer communication.

20, a kind of implementation method of wireless transfer communication is characterized in that, comprising:

By the downlink communication process of BS to user terminal:

C, BS send data in the descending transfer district of the descending sub frame of BS to RS, and RS receives described data by the descending transfer district in the sub-frame of uplink of the 2nd OFDMA-FDD transceiver of RS;

D, RS send the data set user terminal at the descending sub frame of the OFDMA-FDD transceiver of RS;

By the uplink communication process of user terminal to BS:

E, by in the sub-frame of uplink of the OFDMA-FDD transceiver of RS, sending upstream data by user terminal, and RS receives described data;

F, RS send up interim data in the up transfer of the 2nd OFDMA-FDD transceiver descending sub frame district of RS, and BS receives described interim data in the up transfer district of the sub-frame of uplink of BS.

21, method according to claim 20 is characterized in that, is describedly also comprised to the downlink communication process of user terminal by BS:

The OFDMA-FDD transceiver of BS and RS sends lead code at first symbol of the descending sub frame head of separately descending sub frame respectively, and it is synchronous to receive the RS of lead code or user terminal and BS or RS.

22, method according to claim 21 is characterized in that, after sending described lead code, also comprises:

The OFDMA-FDD transceiver of described BS or RS is also wanted transmit frame control head FCH, descending mapping table DL-MAP and up mapping table UL-MAP information, receives the RS of each information or user terminal is determined each burst according to each information subchannel and/or character position and using method information.

23, according to claim 20,21 or 22 described methods, it is characterized in that described step C also comprises:

BS sends broadcast in the descending transfer broadcast sub-channels in the descending transfer district of BS descending sub frame to RS, and RS receives described message by the descending transfer broadcast sub-channels in the 2nd OFDMA-FDD transceiver sub-frame of uplink of RS.

24, according to claim 20,21 or 22 described methods, it is characterized in that described step C also comprises:

When can direct communication between BS and the user terminal, BS adopts predetermined chnnel coding and modulation system with the broadcasting of descending sub frame head, or adopts the transmitting power of predetermined transmission data, directly issues user terminal by BS.

25, method according to claim 20 is characterized in that, is also comprised to the downlink communication process of user terminal by BS:

Lead code in the descending sub frame head of user terminal reception BS descending sub frame, and synchronous with BS;

User terminal receives FCH, DL-MAP and the UL-MAP information that BS sends, and obtains subchannel and/or the character position and the using method information of each burst of BS and RS.

26, method according to claim 20 is characterized in that, is describedly also comprised by the uplink communication process of user terminal to BS:

User terminal receives FCH, DL-MAP and the UL-MAP information of descending sub frame head of descending sub frame of the OFDMA-FDD transceiver of RS, determines each burst subchannel and character position and using method information of RS; Perhaps, user terminal receives FCH, DL-MAP and the UL-MAP information of descending sub frame head of the descending sub frame of BS, determines each burst subchannel and character position and using method information of BS and RS;

The 2nd OFDMA-FDD transceiver of RS receives FCH, DL-MAP and the UL-MAP information of the descending sub frame head in the BS descending sub frame, obtains BS each burst subchannel and character position and using method information.

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